mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 21:08:58 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@461 3c298f89-4303-0410-b956-a3cf2f4a3e73
7013 lines
199 KiB
Plaintext
7013 lines
199 KiB
Plaintext
--- linux-2.4.29/net/bridge/br_private.h 2004-08-08 01:26:06.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/net/bridge/br_private.h 2005-03-14 21:24:04.000000000 +0100
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@@ -143,8 +143,10 @@ extern void br_fdb_insert(struct net_bri
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/* br_forward.c */
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extern void br_deliver(struct net_bridge_port *to,
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struct sk_buff *skb);
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+extern int br_dev_queue_push_xmit(struct sk_buff *skb);
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extern void br_forward(struct net_bridge_port *to,
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struct sk_buff *skb);
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+extern int br_forward_finish(struct sk_buff *skb);
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extern void br_flood_deliver(struct net_bridge *br,
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struct sk_buff *skb,
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int clone);
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@@ -165,7 +167,8 @@ extern void br_get_port_ifindices(struct
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int *ifindices);
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/* br_input.c */
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-extern void br_handle_frame(struct sk_buff *skb);
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+extern int br_handle_frame_finish(struct sk_buff *skb);
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+extern int br_handle_frame(struct sk_buff *skb);
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/* br_ioctl.c */
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extern int br_ioctl(struct net_bridge *br,
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@@ -175,6 +178,10 @@ extern int br_ioctl(struct net_bridge *b
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unsigned long arg2);
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extern int br_ioctl_deviceless_stub(unsigned long arg);
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+/* br_netfilter.c */
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+extern int br_netfilter_init(void);
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+extern void br_netfilter_fini(void);
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+
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/* br_stp.c */
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extern int br_is_root_bridge(struct net_bridge *br);
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extern struct net_bridge_port *br_get_port(struct net_bridge *br,
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--- linux-2.4.29/include/linux/if_bridge.h 2001-11-22 20:47:12.000000000 +0100
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+++ linux-2.4.29-ebt-brnf/include/linux/if_bridge.h 2005-03-14 21:11:28.000000000 +0100
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@@ -102,7 +102,8 @@ struct net_bridge;
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struct net_bridge_port;
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extern int (*br_ioctl_hook)(unsigned long arg);
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-extern void (*br_handle_frame_hook)(struct sk_buff *skb);
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+extern int (*br_handle_frame_hook)(struct sk_buff *skb);
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+extern int (*br_should_route_hook)(struct sk_buff **pskb);
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#endif
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--- linux-2.4.29/net/core/dev.c 2004-04-14 15:05:41.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/net/core/dev.c 2005-03-14 00:00:29.000000000 +0100
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@@ -1426,7 +1426,7 @@ static void net_tx_action(struct softirq
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#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
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-void (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
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+int (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
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#endif
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static __inline__ int handle_bridge(struct sk_buff *skb,
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@@ -1443,7 +1443,6 @@ static __inline__ int handle_bridge(stru
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}
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}
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- br_handle_frame_hook(skb);
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return ret;
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}
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@@ -1503,7 +1502,12 @@ int netif_receive_skb(struct sk_buff *sk
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#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
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if (skb->dev->br_port != NULL && br_handle_frame_hook != NULL &&
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skb->pkt_type != PACKET_LOOPBACK) {
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- return handle_bridge(skb, pt_prev);
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+ int ret;
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+
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+ ret = handle_bridge(skb, pt_prev);
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+ if (br_handle_frame_hook(skb) == 0)
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+ return ret;
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+ pt_prev = NULL;
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}
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#endif
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--- linux-2.4.29/net/bridge/br_input.c 2003-08-25 13:44:44.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/net/bridge/br_input.c 2005-03-14 00:00:29.000000000 +0100
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@@ -24,6 +24,9 @@ unsigned char bridge_ula[6] = { 0x01, 0x
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static int br_pass_frame_up_finish(struct sk_buff *skb)
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{
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+#ifdef CONFIG_NETFILTER_DEBUG
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+ skb->nf_debug = 0;
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+#endif
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netif_rx(skb);
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return 0;
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@@ -46,7 +49,7 @@ static void br_pass_frame_up(struct net_
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br_pass_frame_up_finish);
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}
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-static int br_handle_frame_finish(struct sk_buff *skb)
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+int br_handle_frame_finish(struct sk_buff *skb)
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{
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struct net_bridge *br;
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unsigned char *dest;
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@@ -112,7 +115,7 @@ err_nolock:
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return 0;
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}
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-void br_handle_frame(struct sk_buff *skb)
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+int br_handle_frame(struct sk_buff *skb)
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{
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struct net_bridge *br;
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unsigned char *dest;
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@@ -146,26 +149,35 @@ void br_handle_frame(struct sk_buff *skb
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goto handle_special_frame;
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if (p->state == BR_STATE_FORWARDING) {
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+ if (br_should_route_hook && br_should_route_hook(&skb)) {
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+ read_unlock(&br->lock);
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+ return -1;
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+ }
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+
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+ if (!memcmp(p->br->dev.dev_addr, dest, ETH_ALEN))
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+ skb->pkt_type = PACKET_HOST;
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+
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NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
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br_handle_frame_finish);
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read_unlock(&br->lock);
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- return;
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+ return 0;
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}
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err:
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read_unlock(&br->lock);
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err_nolock:
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kfree_skb(skb);
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- return;
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+ return 0;
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handle_special_frame:
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if (!dest[5]) {
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NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,NULL,
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br_stp_handle_bpdu);
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read_unlock(&br->lock);
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- return;
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+ return 0;
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}
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read_unlock(&br->lock);
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kfree_skb(skb);
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+ return 0;
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}
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--- linux-2.4.29/net/bridge/br_forward.c 2003-11-28 19:26:21.000000000 +0100
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+++ linux-2.4.29-ebt-brnf/net/bridge/br_forward.c 2005-03-14 00:00:29.000000000 +0100
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@@ -30,18 +30,21 @@ static inline int should_deliver(struct
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return 1;
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}
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-static int __dev_queue_push_xmit(struct sk_buff *skb)
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+int br_dev_queue_push_xmit(struct sk_buff *skb)
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{
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+#ifdef CONFIG_NETFILTER
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+ nf_bridge_maybe_copy_header(skb);
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+#endif
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skb_push(skb, ETH_HLEN);
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dev_queue_xmit(skb);
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return 0;
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}
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-static int __br_forward_finish(struct sk_buff *skb)
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+int br_forward_finish(struct sk_buff *skb)
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{
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NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
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- __dev_queue_push_xmit);
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+ br_dev_queue_push_xmit);
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return 0;
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}
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@@ -49,8 +52,11 @@ static int __br_forward_finish(struct sk
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static void __br_deliver(struct net_bridge_port *to, struct sk_buff *skb)
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{
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skb->dev = to->dev;
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+#ifdef CONFIG_NETFILTER_DEBUG
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+ skb->nf_debug = 0;
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+#endif
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NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
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- __br_forward_finish);
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+ br_forward_finish);
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}
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static void __br_forward(struct net_bridge_port *to, struct sk_buff *skb)
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@@ -62,7 +68,7 @@ static void __br_forward(struct net_brid
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skb->ip_summed = CHECKSUM_NONE;
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NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
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- __br_forward_finish);
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+ br_forward_finish);
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}
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/* called under bridge lock */
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--- linux-2.4.29/net/bridge/br.c 2004-08-08 01:26:06.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/net/bridge/br.c 2005-03-14 00:00:29.000000000 +0100
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@@ -30,6 +30,8 @@
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#include "../atm/lec.h"
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#endif
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+int (*br_should_route_hook) (struct sk_buff **pskb) = NULL;
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+
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void br_dec_use_count()
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{
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MOD_DEC_USE_COUNT;
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@@ -44,6 +46,10 @@ static int __init br_init(void)
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{
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printk(KERN_INFO "NET4: Ethernet Bridge 008 for NET4.0\n");
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+#ifdef CONFIG_NETFILTER
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+ if (br_netfilter_init())
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+ return 1;
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+#endif
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br_handle_frame_hook = br_handle_frame;
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br_ioctl_hook = br_ioctl_deviceless_stub;
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#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
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@@ -57,6 +63,9 @@ static int __init br_init(void)
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static void __exit br_deinit(void)
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{
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+#ifdef CONFIG_NETFILTER
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+ br_netfilter_fini();
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+#endif
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unregister_netdevice_notifier(&br_device_notifier);
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rtnl_lock();
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@@ -73,7 +82,7 @@ static void __exit br_deinit(void)
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#endif
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}
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-EXPORT_NO_SYMBOLS;
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+EXPORT_SYMBOL(br_should_route_hook);
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module_init(br_init)
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module_exit(br_deinit)
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--- linux-2.4.29/net/bridge/Makefile 2000-12-29 23:07:24.000000000 +0100
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+++ linux-2.4.29-ebt-brnf/net/bridge/Makefile 2005-03-14 00:00:29.000000000 +0100
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@@ -7,10 +7,17 @@
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#
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# Note 2! The CFLAGS definition is now in the main makefile...
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+export-objs := br.o
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+
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O_TARGET := bridge.o
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obj-y := br.o br_device.o br_fdb.o br_forward.o br_if.o br_input.o \
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br_ioctl.o br_notify.o br_stp.o br_stp_bpdu.o \
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br_stp_if.o br_stp_timer.o
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+
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+ifeq ($(CONFIG_NETFILTER),y)
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+obj-y += br_netfilter.o
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+endif
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+
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obj-m := $(O_TARGET)
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include $(TOPDIR)/Rules.make
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--- linux-2.4.29/include/linux/netfilter_bridge.h 2001-06-12 04:15:27.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge.h 2005-03-14 21:24:06.000000000 +0100
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@@ -6,6 +6,10 @@
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#include <linux/config.h>
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#include <linux/netfilter.h>
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+#if defined(__KERNEL__) && defined(CONFIG_NETFILTER)
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+#include <asm/atomic.h>
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+#include <linux/if_ether.h>
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+#endif
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/* Bridge Hooks */
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/* After promisc drops, checksum checks. */
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@@ -18,7 +22,76 @@
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#define NF_BR_LOCAL_OUT 3
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/* Packets about to hit the wire. */
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#define NF_BR_POST_ROUTING 4
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-#define NF_BR_NUMHOOKS 5
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+/* Not really a hook, but used for the ebtables broute table */
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+#define NF_BR_BROUTING 5
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+#define NF_BR_NUMHOOKS 6
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+
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+#ifdef __KERNEL__
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+
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+#define BRNF_PKT_TYPE 0x01
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+#define BRNF_BRIDGED_DNAT 0x02
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+#define BRNF_DONT_TAKE_PARENT 0x04
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+#define BRNF_BRIDGED 0x08
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+#define BRNF_NF_BRIDGE_PREROUTING 0x10
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+
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+enum nf_br_hook_priorities {
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+ NF_BR_PRI_FIRST = INT_MIN,
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+ NF_BR_PRI_NAT_DST_BRIDGED = -300,
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+ NF_BR_PRI_FILTER_BRIDGED = -200,
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+ NF_BR_PRI_BRNF = 0,
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+ NF_BR_PRI_NAT_DST_OTHER = 100,
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+ NF_BR_PRI_FILTER_OTHER = 200,
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+ NF_BR_PRI_NAT_SRC = 300,
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+ NF_BR_PRI_LAST = INT_MAX,
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+};
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+
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+#ifdef CONFIG_NETFILTER
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+static inline
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+struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
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+{
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+ struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
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+
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+ if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
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+ atomic_set(&(*nf_bridge)->use, 1);
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+ (*nf_bridge)->mask = 0;
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+ (*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
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+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
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+ (*nf_bridge)->netoutdev = NULL;
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+#endif
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+ }
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+
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+ return *nf_bridge;
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+}
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+
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+/* Only used in br_forward.c */
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+static inline
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+void nf_bridge_maybe_copy_header(struct sk_buff *skb)
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+{
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+ if (skb->nf_bridge) {
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+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
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+ memcpy(skb->data - 18, skb->nf_bridge->data, 18);
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+ skb_push(skb, 4);
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+ } else
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+ memcpy(skb->data - 16, skb->nf_bridge->data, 16);
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+ }
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+}
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+
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+static inline
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+void nf_bridge_save_header(struct sk_buff *skb)
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+{
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+ int header_size = 16;
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+
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+ if (skb->protocol == __constant_htons(ETH_P_8021Q))
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+ header_size = 18;
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+ memcpy(skb->nf_bridge->data, skb->data - header_size, header_size);
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+}
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+struct bridge_skb_cb {
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+ union {
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+ __u32 ipv4;
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+ } daddr;
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+};
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+#endif /* CONFIG_NETFILTER */
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+#endif /* __KERNEL__ */
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#endif
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--- linux-2.4.29/include/linux/netfilter_ipv4/ip_tables.h 2004-08-08 01:26:06.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv4/ip_tables.h 2005-03-14 21:24:28.000000000 +0100
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@@ -159,7 +159,7 @@ struct ipt_entry
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#define IPT_CONTINUE 0xFFFFFFFF
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/* For standard target */
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-#define IPT_RETURN (-NF_MAX_VERDICT - 1)
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+#define IPT_RETURN (-NF_REPEAT - 1)
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/* TCP matching stuff */
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struct ipt_tcp
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--- linux-2.4.29/include/linux/netfilter_ipv6/ip6_tables.h 2004-08-08 01:26:06.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv6/ip6_tables.h 2005-03-14 00:00:29.000000000 +0100
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@@ -167,7 +167,7 @@ struct ip6t_entry
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#define IP6T_CONTINUE 0xFFFFFFFF
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/* For standard target */
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-#define IP6T_RETURN (-NF_MAX_VERDICT - 1)
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+#define IP6T_RETURN (-NF_REPEAT - 1)
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/* TCP matching stuff */
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struct ip6t_tcp
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--- linux-2.4.29/include/linux/netfilter_arp/arp_tables.h 2003-08-25 13:44:44.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_arp/arp_tables.h 2005-03-14 21:24:31.000000000 +0100
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@@ -154,7 +154,7 @@ struct arpt_entry
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#define ARPT_CONTINUE 0xFFFFFFFF
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/* For standard target */
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-#define ARPT_RETURN (-NF_MAX_VERDICT - 1)
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+#define ARPT_RETURN (-NF_REPEAT - 1)
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/* The argument to ARPT_SO_GET_INFO */
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struct arpt_getinfo
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--- linux-2.4.29/net/Makefile 2004-08-08 01:26:06.000000000 +0200
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+++ linux-2.4.29-ebt-brnf/net/Makefile 2005-03-14 00:00:29.000000000 +0100
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@@ -7,7 +7,8 @@
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O_TARGET := network.o
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-mod-subdirs := ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink sched core sctp 802
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+mod-subdirs := ipv4/netfilter ipv6/netfilter bridge/netfilter ipx irda \
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+ bluetooth atm netlink sched core sctp 802
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export-objs := netsyms.o
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subdir-y := core ethernet
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@@ -27,6 +28,12 @@ subdir-$(CONFIG_NETFILTER) += ipv6/netfi
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endif
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endif
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+ifneq ($(CONFIG_BRIDGE),n)
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+ifneq ($(CONFIG_BRIDGE),)
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+subdir-$(CONFIG_BRIDGE) += bridge/netfilter
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+endif
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+endif
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+
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subdir-$(CONFIG_KHTTPD) += khttpd
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subdir-$(CONFIG_PACKET) += packet
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subdir-$(CONFIG_NET_SCHED) += sched
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--- linux-2.4.29/net/Config.in 2005-01-19 15:10:13.000000000 +0100
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+++ linux-2.4.29-ebt-brnf/net/Config.in 2005-03-14 00:00:29.000000000 +0100
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@@ -70,6 +70,9 @@ if [ "$CONFIG_DECNET" != "n" ]; then
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source net/decnet/Config.in
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fi
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dep_tristate '802.1d Ethernet Bridging' CONFIG_BRIDGE $CONFIG_INET
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+if [ "$CONFIG_BRIDGE" != "n" -a "$CONFIG_NETFILTER" != "n" ]; then
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+ source net/bridge/netfilter/Config.in
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+fi
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if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
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tristate 'CCITT X.25 Packet Layer (EXPERIMENTAL)' CONFIG_X25
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tristate 'LAPB Data Link Driver (EXPERIMENTAL)' CONFIG_LAPB
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--- /dev/null 2005-03-14 20:10:29.001600248 +0100
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+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/Makefile 2005-03-14 00:00:29.000000000 +0100
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@@ -0,0 +1,34 @@
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+#
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+# Makefile for the netfilter modules on top of bridging.
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+#
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+# Note! Dependencies are done automagically by 'make dep', which also
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+# removes any old dependencies. DON'T put your own dependencies here
|
|
+# unless it's something special (ie not a .c file).
|
|
+#
|
|
+# Note 2! The CFLAGS definition is now in the main makefile...
|
|
+
|
|
+O_TARGET := netfilter.o
|
|
+
|
|
+export-objs := ebtables.o
|
|
+
|
|
+obj-$(CONFIG_BRIDGE_NF_EBTABLES) += ebtables.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_T_FILTER) += ebtable_filter.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_T_NAT) += ebtable_nat.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_BROUTE) += ebtable_broute.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_802_3) += ebt_802_3.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_ARPF) += ebt_arp.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_AMONG) += ebt_among.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_IPF) += ebt_ip.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_LIMIT) += ebt_limit.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_MARKF) += ebt_mark_m.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_pkttype.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_STP) += ebt_stp.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_VLANF) += ebt_vlan.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_ulog.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_ARPREPLY) += ebt_arpreply.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_DNAT) += ebt_dnat.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_MARK_T) += ebt_mark.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_REDIRECT) += ebt_redirect.o
|
|
+obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o
|
|
+include $(TOPDIR)/Rules.make
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/Config.in 2005-03-14 00:00:29.000000000 +0100
|
|
@@ -0,0 +1,23 @@
|
|
+#
|
|
+# Bridge netfilter configuration
|
|
+#
|
|
+dep_tristate ' Bridge: ebtables' CONFIG_BRIDGE_NF_EBTABLES $CONFIG_BRIDGE
|
|
+dep_tristate ' ebt: filter table support' CONFIG_BRIDGE_EBT_T_FILTER $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: nat table support' CONFIG_BRIDGE_EBT_T_NAT $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: broute table support' CONFIG_BRIDGE_EBT_BROUTE $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: log support' CONFIG_BRIDGE_EBT_LOG $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: ulog support' CONFIG_BRIDGE_EBT_LOG $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: IP filter support' CONFIG_BRIDGE_EBT_IPF $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: ARP filter support' CONFIG_BRIDGE_EBT_ARPF $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: among filter support' CONFIG_BRIDGE_EBT_AMONG $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: limit filter support' CONFIG_BRIDGE_EBT_LIMIT $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: 802.1Q VLAN filter support' CONFIG_BRIDGE_EBT_VLANF $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: 802.3 filter support' CONFIG_BRIDGE_EBT_802_3 $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: packet type filter support' CONFIG_BRIDGE_EBT_PKTTYPE $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: STP filter support' CONFIG_BRIDGE_EBT_STP $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: mark filter support' CONFIG_BRIDGE_EBT_MARKF $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: arp reply target support' CONFIG_BRIDGE_EBT_ARPREPLY $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: snat target support' CONFIG_BRIDGE_EBT_SNAT $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: dnat target support' CONFIG_BRIDGE_EBT_DNAT $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: redirect target support' CONFIG_BRIDGE_EBT_REDIRECT $CONFIG_BRIDGE_NF_EBTABLES
|
|
+dep_tristate ' ebt: mark target support' CONFIG_BRIDGE_EBT_MARK_T $CONFIG_BRIDGE_NF_EBTABLES
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebtable_filter.c 2005-03-14 00:00:29.000000000 +0100
|
|
@@ -0,0 +1,90 @@
|
|
+/*
|
|
+ * ebtable_filter
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * April, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
|
|
+ (1 << NF_BR_LOCAL_OUT))
|
|
+
|
|
+static struct ebt_entries initial_chains[] =
|
|
+{
|
|
+ {0, "INPUT", 0, EBT_ACCEPT, 0},
|
|
+ {0, "FORWARD", 0, EBT_ACCEPT, 0},
|
|
+ {0, "OUTPUT", 0, EBT_ACCEPT, 0}
|
|
+};
|
|
+
|
|
+static struct ebt_replace initial_table =
|
|
+{
|
|
+ "filter", FILTER_VALID_HOOKS, 0, 3 * sizeof(struct ebt_entries),
|
|
+ { [NF_BR_LOCAL_IN]&initial_chains[0], [NF_BR_FORWARD]&initial_chains[1],
|
|
+ [NF_BR_LOCAL_OUT]&initial_chains[2] }, 0, NULL, (char *)initial_chains
|
|
+};
|
|
+
|
|
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
|
|
+{
|
|
+ if (valid_hooks & ~FILTER_VALID_HOOKS)
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_table frame_filter =
|
|
+{
|
|
+ {NULL, NULL}, "filter", &initial_table, FILTER_VALID_HOOKS,
|
|
+ RW_LOCK_UNLOCKED, check, NULL
|
|
+};
|
|
+
|
|
+static unsigned int
|
|
+ebt_hook (unsigned int hook, struct sk_buff **pskb, const struct net_device *in,
|
|
+ const struct net_device *out, int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ return ebt_do_table(hook, pskb, in, out, &frame_filter);
|
|
+}
|
|
+
|
|
+static struct nf_hook_ops ebt_ops_filter[] = {
|
|
+ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_LOCAL_IN,
|
|
+ NF_BR_PRI_FILTER_BRIDGED},
|
|
+ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_FORWARD,
|
|
+ NF_BR_PRI_FILTER_BRIDGED},
|
|
+ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_LOCAL_OUT,
|
|
+ NF_BR_PRI_FILTER_OTHER}
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ int i, j, ret;
|
|
+
|
|
+ ret = ebt_register_table(&frame_filter);
|
|
+ if (ret < 0)
|
|
+ return ret;
|
|
+ for (i = 0; i < sizeof(ebt_ops_filter) / sizeof(ebt_ops_filter[0]); i++)
|
|
+ if ((ret = nf_register_hook(&ebt_ops_filter[i])) < 0)
|
|
+ goto cleanup;
|
|
+ return ret;
|
|
+cleanup:
|
|
+ for (j = 0; j < i; j++)
|
|
+ nf_unregister_hook(&ebt_ops_filter[j]);
|
|
+ ebt_unregister_table(&frame_filter);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; i < sizeof(ebt_ops_filter) / sizeof(ebt_ops_filter[0]); i++)
|
|
+ nf_unregister_hook(&ebt_ops_filter[i]);
|
|
+ ebt_unregister_table(&frame_filter);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebtable_nat.c 2005-03-14 00:00:29.000000000 +0100
|
|
@@ -0,0 +1,96 @@
|
|
+/*
|
|
+ * ebtable_nat
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * April, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/module.h>
|
|
+#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
|
|
+ (1 << NF_BR_POST_ROUTING))
|
|
+
|
|
+static struct ebt_entries initial_chains[] =
|
|
+{
|
|
+ {0, "PREROUTING", 0, EBT_ACCEPT, 0},
|
|
+ {0, "OUTPUT", 0, EBT_ACCEPT, 0},
|
|
+ {0, "POSTROUTING", 0, EBT_ACCEPT, 0}
|
|
+};
|
|
+
|
|
+static struct ebt_replace initial_table =
|
|
+{
|
|
+ "nat", NAT_VALID_HOOKS, 0, 3 * sizeof(struct ebt_entries),
|
|
+ { [NF_BR_PRE_ROUTING]&initial_chains[0], [NF_BR_LOCAL_OUT]&initial_chains[1],
|
|
+ [NF_BR_POST_ROUTING]&initial_chains[2] }, 0, NULL, (char *)initial_chains
|
|
+};
|
|
+
|
|
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
|
|
+{
|
|
+ if (valid_hooks & ~NAT_VALID_HOOKS)
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_table frame_nat =
|
|
+{
|
|
+ {NULL, NULL}, "nat", &initial_table, NAT_VALID_HOOKS,
|
|
+ RW_LOCK_UNLOCKED, check, NULL
|
|
+};
|
|
+
|
|
+static unsigned int
|
|
+ebt_nat_dst(unsigned int hook, struct sk_buff **pskb, const struct net_device *in
|
|
+ , const struct net_device *out, int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ return ebt_do_table(hook, pskb, in, out, &frame_nat);
|
|
+}
|
|
+
|
|
+static unsigned int
|
|
+ebt_nat_src(unsigned int hook, struct sk_buff **pskb, const struct net_device *in
|
|
+ , const struct net_device *out, int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ return ebt_do_table(hook, pskb, in, out, &frame_nat);
|
|
+}
|
|
+
|
|
+static struct nf_hook_ops ebt_ops_nat[] = {
|
|
+ { { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_LOCAL_OUT,
|
|
+ NF_BR_PRI_NAT_DST_OTHER},
|
|
+ { { NULL, NULL }, ebt_nat_src, PF_BRIDGE, NF_BR_POST_ROUTING,
|
|
+ NF_BR_PRI_NAT_SRC},
|
|
+ { { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_PRE_ROUTING,
|
|
+ NF_BR_PRI_NAT_DST_BRIDGED},
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ int i, ret, j;
|
|
+
|
|
+ ret = ebt_register_table(&frame_nat);
|
|
+ if (ret < 0)
|
|
+ return ret;
|
|
+ for (i = 0; i < sizeof(ebt_ops_nat) / sizeof(ebt_ops_nat[0]); i++)
|
|
+ if ((ret = nf_register_hook(&ebt_ops_nat[i])) < 0)
|
|
+ goto cleanup;
|
|
+ return ret;
|
|
+cleanup:
|
|
+ for (j = 0; j < i; j++)
|
|
+ nf_unregister_hook(&ebt_ops_nat[j]);
|
|
+ ebt_unregister_table(&frame_nat);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; i < sizeof(ebt_ops_nat) / sizeof(ebt_ops_nat[0]); i++)
|
|
+ nf_unregister_hook(&ebt_ops_nat[i]);
|
|
+ ebt_unregister_table(&frame_nat);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebtable_broute.c 2005-03-14 00:00:29.000000000 +0100
|
|
@@ -0,0 +1,79 @@
|
|
+/*
|
|
+ * ebtable_broute
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * April, 2002
|
|
+ *
|
|
+ * This table lets you choose between routing and bridging for frames
|
|
+ * entering on a bridge enslaved nic. This table is traversed before any
|
|
+ * other ebtables table. See net/bridge/br_input.c.
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/if_bridge.h>
|
|
+#include <linux/brlock.h>
|
|
+
|
|
+// EBT_ACCEPT means the frame will be bridged
|
|
+// EBT_DROP means the frame will be routed
|
|
+static struct ebt_entries initial_chain =
|
|
+ {0, "BROUTING", 0, EBT_ACCEPT, 0};
|
|
+
|
|
+static struct ebt_replace initial_table =
|
|
+{
|
|
+ "broute", 1 << NF_BR_BROUTING, 0, sizeof(struct ebt_entries),
|
|
+ { [NF_BR_BROUTING]&initial_chain}, 0, NULL, (char *)&initial_chain
|
|
+};
|
|
+
|
|
+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
|
|
+{
|
|
+ if (valid_hooks & ~(1 << NF_BR_BROUTING))
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_table broute_table =
|
|
+{
|
|
+ {NULL, NULL}, "broute", &initial_table, 1 << NF_BR_BROUTING,
|
|
+ RW_LOCK_UNLOCKED, check, NULL
|
|
+};
|
|
+
|
|
+static int ebt_broute(struct sk_buff **pskb)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ ret = ebt_do_table(NF_BR_BROUTING, pskb, (*pskb)->dev, NULL,
|
|
+ &broute_table);
|
|
+ if (ret == NF_DROP)
|
|
+ return 1; // route it
|
|
+ return 0; // bridge it
|
|
+}
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ ret = ebt_register_table(&broute_table);
|
|
+ if (ret < 0)
|
|
+ return ret;
|
|
+ br_write_lock_bh(BR_NETPROTO_LOCK);
|
|
+ // see br_input.c
|
|
+ br_should_route_hook = ebt_broute;
|
|
+ br_write_unlock_bh(BR_NETPROTO_LOCK);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ br_write_lock_bh(BR_NETPROTO_LOCK);
|
|
+ br_should_route_hook = NULL;
|
|
+ br_write_unlock_bh(BR_NETPROTO_LOCK);
|
|
+ ebt_unregister_table(&broute_table);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_among.c 2005-03-14 00:00:29.000000000 +0100
|
|
@@ -0,0 +1,223 @@
|
|
+/*
|
|
+ * ebt_among
|
|
+ *
|
|
+ * Authors:
|
|
+ * Grzegorz Borowiak <grzes@gnu.univ.gda.pl>
|
|
+ *
|
|
+ * August, 2003
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_among.h>
|
|
+#include <linux/ip.h>
|
|
+#include <linux/if_arp.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+static int ebt_mac_wormhash_contains(const struct ebt_mac_wormhash *wh,
|
|
+ const char *mac, uint32_t ip)
|
|
+{
|
|
+ /* You may be puzzled as to how this code works.
|
|
+ * Some tricks were used, refer to
|
|
+ * include/linux/netfilter_bridge/ebt_among.h
|
|
+ * as there you can find a solution of this mystery.
|
|
+ */
|
|
+ const struct ebt_mac_wormhash_tuple *p;
|
|
+ int start, limit, i;
|
|
+ uint32_t cmp[2] = { 0, 0 };
|
|
+ int key = (const unsigned char) mac[5];
|
|
+
|
|
+ memcpy(((char *) cmp) + 2, mac, 6);
|
|
+ start = wh->table[key];
|
|
+ limit = wh->table[key + 1];
|
|
+ if (ip) {
|
|
+ for (i = start; i < limit; i++) {
|
|
+ p = &wh->pool[i];
|
|
+ if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
|
|
+ if (p->ip == 0 || p->ip == ip) {
|
|
+ return 1;
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+ } else {
|
|
+ for (i = start; i < limit; i++) {
|
|
+ p = &wh->pool[i];
|
|
+ if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
|
|
+ if (p->ip == 0) {
|
|
+ return 1;
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int ebt_mac_wormhash_check_integrity(const struct ebt_mac_wormhash
|
|
+ *wh)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; i < 256; i++) {
|
|
+ if (wh->table[i] > wh->table[i + 1])
|
|
+ return -0x100 - i;
|
|
+ if (wh->table[i] < 0)
|
|
+ return -0x200 - i;
|
|
+ if (wh->table[i] > wh->poolsize)
|
|
+ return -0x300 - i;
|
|
+ }
|
|
+ if (wh->table[256] > wh->poolsize)
|
|
+ return -0xc00;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int get_ip_dst(const struct sk_buff *skb, uint32_t * addr)
|
|
+{
|
|
+ if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_IP))
|
|
+ *addr = skb->nh.iph->daddr;
|
|
+ else if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) {
|
|
+ uint32_t arp_len = sizeof(struct arphdr) +
|
|
+ (2 * (((*skb).nh.arph)->ar_hln)) +
|
|
+ (2 * (((*skb).nh.arph)->ar_pln));
|
|
+
|
|
+ /* Make sure the packet is long enough. */
|
|
+ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
|
|
+ return -1;
|
|
+ /* IPv4 addresses are always 4 bytes. */
|
|
+ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t))
|
|
+ return -1;
|
|
+
|
|
+ memcpy(addr, ((*skb).nh.raw) + sizeof(struct arphdr) +
|
|
+ (2 * (((*skb).nh.arph)->ar_hln)) +
|
|
+ (((*skb).nh.arph)->ar_pln), sizeof(uint32_t));
|
|
+
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int get_ip_src(const struct sk_buff *skb, uint32_t * addr)
|
|
+{
|
|
+ if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_IP))
|
|
+ *addr = skb->nh.iph->saddr;
|
|
+ else if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) {
|
|
+ uint32_t arp_len = sizeof(struct arphdr) +
|
|
+ (2 * (((*skb).nh.arph)->ar_hln)) +
|
|
+ (2 * (((*skb).nh.arph)->ar_pln));
|
|
+
|
|
+ /* Make sure the packet is long enough. */
|
|
+ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
|
|
+ return -1;
|
|
+ /* IPv4 addresses are always 4 bytes. */
|
|
+ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t))
|
|
+ return -1;
|
|
+
|
|
+ memcpy(addr, ((*skb).nh.raw) + sizeof(struct arphdr) +
|
|
+ ((((*skb).nh.arph)->ar_hln)), sizeof(uint32_t));
|
|
+
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int ebt_filter_among(const struct sk_buff *skb,
|
|
+ const struct net_device *in,
|
|
+ const struct net_device *out, const void *data,
|
|
+ unsigned int datalen)
|
|
+{
|
|
+ struct ebt_among_info *info = (struct ebt_among_info *) data;
|
|
+ const char *dmac, *smac;
|
|
+ const struct ebt_mac_wormhash *wh_dst, *wh_src;
|
|
+ uint32_t dip = 0, sip = 0;
|
|
+
|
|
+ wh_dst = ebt_among_wh_dst(info);
|
|
+ wh_src = ebt_among_wh_src(info);
|
|
+
|
|
+ if (wh_src) {
|
|
+ smac = skb->mac.ethernet->h_source;
|
|
+ if (get_ip_src(skb, &sip))
|
|
+ return EBT_NOMATCH;
|
|
+ if (!(info->bitmask & EBT_AMONG_SRC_NEG)) {
|
|
+ /* we match only if it contains */
|
|
+ if (!ebt_mac_wormhash_contains(wh_src, smac, sip))
|
|
+ return EBT_NOMATCH;
|
|
+ } else {
|
|
+ /* we match only if it DOES NOT contain */
|
|
+ if (ebt_mac_wormhash_contains(wh_src, smac, sip))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (wh_dst) {
|
|
+ dmac = skb->mac.ethernet->h_dest;
|
|
+ if (get_ip_dst(skb, &dip))
|
|
+ return EBT_NOMATCH;
|
|
+ if (!(info->bitmask & EBT_AMONG_DST_NEG)) {
|
|
+ /* we match only if it contains */
|
|
+ if (!ebt_mac_wormhash_contains(wh_dst, dmac, dip))
|
|
+ return EBT_NOMATCH;
|
|
+ } else {
|
|
+ /* we match only if it DOES NOT contain */
|
|
+ if (ebt_mac_wormhash_contains(wh_dst, dmac, dip))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return EBT_MATCH;
|
|
+}
|
|
+
|
|
+static int ebt_among_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data,
|
|
+ unsigned int datalen)
|
|
+{
|
|
+ struct ebt_among_info *info = (struct ebt_among_info *) data;
|
|
+ int expected_length = sizeof(struct ebt_among_info);
|
|
+ const struct ebt_mac_wormhash *wh_dst, *wh_src;
|
|
+ int err;
|
|
+
|
|
+ wh_dst = ebt_among_wh_dst(info);
|
|
+ wh_src = ebt_among_wh_src(info);
|
|
+ expected_length += ebt_mac_wormhash_size(wh_dst);
|
|
+ expected_length += ebt_mac_wormhash_size(wh_src);
|
|
+
|
|
+ if (datalen != EBT_ALIGN(expected_length)) {
|
|
+ printk(KERN_WARNING
|
|
+ "ebtables: among: wrong size: %d"
|
|
+ "against expected %d, rounded to %d\n",
|
|
+ datalen, expected_length,
|
|
+ EBT_ALIGN(expected_length));
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ if (wh_dst && (err = ebt_mac_wormhash_check_integrity(wh_dst))) {
|
|
+ printk(KERN_WARNING
|
|
+ "ebtables: among: dst integrity fail: %x\n", -err);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ if (wh_src && (err = ebt_mac_wormhash_check_integrity(wh_src))) {
|
|
+ printk(KERN_WARNING
|
|
+ "ebtables: among: src integrity fail: %x\n", -err);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_among = {
|
|
+ {NULL, NULL},
|
|
+ EBT_AMONG_MATCH,
|
|
+ ebt_filter_among,
|
|
+ ebt_among_check,
|
|
+ NULL,
|
|
+ THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_match(&filter_among);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&filter_among);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_limit.c 2005-03-14 00:00:29.000000000 +0100
|
|
@@ -0,0 +1,101 @@
|
|
+/*
|
|
+ * ebt_limit
|
|
+ *
|
|
+ * Authors:
|
|
+ * Tom Marshall <tommy@home.tig-grr.com>
|
|
+ *
|
|
+ * Mostly copied from netfilter's ipt_limit.c, see that file for explanation
|
|
+ *
|
|
+ * September, 2003
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_limit.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+#include <linux/netdevice.h>
|
|
+#include <linux/spinlock.h>
|
|
+
|
|
+static spinlock_t limit_lock = SPIN_LOCK_UNLOCKED;
|
|
+
|
|
+#define CREDITS_PER_JIFFY 128
|
|
+
|
|
+static int ebt_limit_match(const struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out, const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_limit_info *info = (struct ebt_limit_info *)data;
|
|
+ unsigned long now = jiffies;
|
|
+
|
|
+ spin_lock_bh(&limit_lock);
|
|
+ info->credit += (now - xchg(&info->prev, now)) * CREDITS_PER_JIFFY;
|
|
+ if (info->credit > info->credit_cap)
|
|
+ info->credit = info->credit_cap;
|
|
+
|
|
+ if (info->credit >= info->cost) {
|
|
+ /* We're not limited. */
|
|
+ info->credit -= info->cost;
|
|
+ spin_unlock_bh(&limit_lock);
|
|
+ return EBT_MATCH;
|
|
+ }
|
|
+
|
|
+ spin_unlock_bh(&limit_lock);
|
|
+ return EBT_NOMATCH;
|
|
+}
|
|
+
|
|
+/* Precision saver. */
|
|
+static u_int32_t
|
|
+user2credits(u_int32_t user)
|
|
+{
|
|
+ /* If multiplying would overflow... */
|
|
+ if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
|
|
+ /* Divide first. */
|
|
+ return (user / EBT_LIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
|
|
+
|
|
+ return (user * HZ * CREDITS_PER_JIFFY) / EBT_LIMIT_SCALE;
|
|
+}
|
|
+
|
|
+static int ebt_limit_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_limit_info *info = (struct ebt_limit_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_limit_info)))
|
|
+ return -EINVAL;
|
|
+
|
|
+ /* Check for overflow. */
|
|
+ if (info->burst == 0
|
|
+ || user2credits(info->avg * info->burst) < user2credits(info->avg)) {
|
|
+ printk("Overflow in ebt_limit: %u/%u\n",
|
|
+ info->avg, info->burst);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ /* User avg in seconds * EBT_LIMIT_SCALE: convert to jiffies * 128. */
|
|
+ info->prev = jiffies;
|
|
+ info->credit = user2credits(info->avg * info->burst);
|
|
+ info->credit_cap = user2credits(info->avg * info->burst);
|
|
+ info->cost = user2credits(info->avg);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match ebt_limit_reg =
|
|
+{
|
|
+ {NULL, NULL}, EBT_LIMIT_MATCH, ebt_limit_match, ebt_limit_check, NULL,
|
|
+ THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_match(&ebt_limit_reg);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&ebt_limit_reg);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_arpreply.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,86 @@
|
|
+/*
|
|
+ * ebt_arpreply
|
|
+ *
|
|
+ * Authors:
|
|
+ * Grzegorz Borowiak <grzes@gnu.univ.gda.pl>
|
|
+ * Bart De Schuymer <bdschuym@pandora.be>
|
|
+ *
|
|
+ * August, 2003
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_arpreply.h>
|
|
+#include <linux/if_arp.h>
|
|
+#include <net/arp.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+static int ebt_target_reply(struct sk_buff **pskb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_arpreply_info *info = (struct ebt_arpreply_info *)data;
|
|
+ struct arphdr *ah;
|
|
+ unsigned char *sha, *arp_ptr;
|
|
+ u32 sip, tip;
|
|
+
|
|
+ ah = (**pskb).nh.arph;
|
|
+ if (ah->ar_op != __constant_htons(ARPOP_REQUEST) ||
|
|
+ ah->ar_hln != ETH_ALEN || ah->ar_pro != htons(ETH_P_IP) ||
|
|
+ ah->ar_pln != 4)
|
|
+ return EBT_CONTINUE;
|
|
+
|
|
+ arp_ptr = (unsigned char *)(ah + 1);
|
|
+
|
|
+ /* get source and target IP */
|
|
+ sha = arp_ptr;
|
|
+ arp_ptr += ETH_ALEN;
|
|
+ memcpy(&sip, arp_ptr, 4);
|
|
+ arp_ptr += 4 + ETH_ALEN;
|
|
+ memcpy(&tip, arp_ptr, 4);
|
|
+
|
|
+ arp_send(ARPOP_REPLY, ETH_P_ARP, sip, in, tip, sha, info->mac, sha);
|
|
+
|
|
+ return info->target;
|
|
+}
|
|
+
|
|
+static int ebt_target_reply_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_arpreply_info *info = (struct ebt_arpreply_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_arpreply_info)))
|
|
+ return -EINVAL;
|
|
+ if (BASE_CHAIN && info->target == EBT_RETURN)
|
|
+ return -EINVAL;
|
|
+ if (e->ethproto != __constant_htons(ETH_P_ARP) ||
|
|
+ e->invflags & EBT_IPROTO)
|
|
+ return -EINVAL;
|
|
+ CLEAR_BASE_CHAIN_BIT;
|
|
+ if (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING))
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_target reply_target =
|
|
+{
|
|
+ .name = EBT_ARPREPLY_TARGET,
|
|
+ .target = ebt_target_reply,
|
|
+ .check = ebt_target_reply_check,
|
|
+ .me = THIS_MODULE,
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_target(&reply_target);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_target(&reply_target);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_802_3.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,74 @@
|
|
+/*
|
|
+ * 802_3
|
|
+ *
|
|
+ * Author:
|
|
+ * Chris Vitale csv@bluetail.com
|
|
+ *
|
|
+ * May 2003
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_802_3.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out, const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
|
|
+ struct ebt_802_3_hdr *hdr = (struct ebt_802_3_hdr *)skb->mac.ethernet;
|
|
+ uint16_t type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
|
|
+
|
|
+ if (info->bitmask & EBT_802_3_SAP) {
|
|
+ if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
|
|
+ return EBT_NOMATCH;
|
|
+ if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+
|
|
+ if (info->bitmask & EBT_802_3_TYPE) {
|
|
+ if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
|
|
+ return EBT_NOMATCH;
|
|
+ if (FWINV(info->type != type, EBT_802_3_TYPE))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+
|
|
+ return EBT_MATCH;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_802_3;
|
|
+static int ebt_802_3_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_802_3_info)))
|
|
+ return -EINVAL;
|
|
+ if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
|
|
+ return -EINVAL;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_802_3 =
|
|
+{
|
|
+ .name = EBT_802_3_MATCH,
|
|
+ .match = ebt_filter_802_3,
|
|
+ .check = ebt_802_3_check,
|
|
+ .me = THIS_MODULE,
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_match(&filter_802_3);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&filter_802_3);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_mark.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,66 @@
|
|
+/*
|
|
+ * ebt_mark
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * July, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+// The mark target can be used in any chain
|
|
+// I believe adding a mangle table just for marking is total overkill
|
|
+// Marking a frame doesn't really change anything in the frame anyway
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_mark_t.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+static int ebt_target_mark(struct sk_buff **pskb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
|
|
+
|
|
+ if ((*pskb)->nfmark != info->mark) {
|
|
+ (*pskb)->nfmark = info->mark;
|
|
+ (*pskb)->nfcache |= NFC_ALTERED;
|
|
+ }
|
|
+ return info->target;
|
|
+}
|
|
+
|
|
+static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_t_info)))
|
|
+ return -EINVAL;
|
|
+ if (BASE_CHAIN && info->target == EBT_RETURN)
|
|
+ return -EINVAL;
|
|
+ CLEAR_BASE_CHAIN_BIT;
|
|
+ if (INVALID_TARGET)
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_target mark_target =
|
|
+{
|
|
+ {NULL, NULL}, EBT_MARK_TARGET, ebt_target_mark,
|
|
+ ebt_target_mark_check, NULL, THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_target(&mark_target);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_target(&mark_target);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_mark_m.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,61 @@
|
|
+/*
|
|
+ * ebt_mark_m
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * July, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_mark_m.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+static int ebt_filter_mark(const struct sk_buff *skb,
|
|
+ const struct net_device *in, const struct net_device *out, const void *data,
|
|
+ unsigned int datalen)
|
|
+{
|
|
+ struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
|
|
+
|
|
+ if (info->bitmask & EBT_MARK_OR)
|
|
+ return !(!!(skb->nfmark & info->mask) ^ info->invert);
|
|
+ return !(((skb->nfmark & info->mask) == info->mark) ^ info->invert);
|
|
+}
|
|
+
|
|
+static int ebt_mark_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_m_info)))
|
|
+ return -EINVAL;
|
|
+ if (info->bitmask & ~EBT_MARK_MASK)
|
|
+ return -EINVAL;
|
|
+ if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
|
|
+ return -EINVAL;
|
|
+ if (!info->bitmask)
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_mark =
|
|
+{
|
|
+ {NULL, NULL}, EBT_MARK_MATCH, ebt_filter_mark, ebt_mark_check, NULL,
|
|
+ THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_match(&filter_mark);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&filter_mark);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_pkttype.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,60 @@
|
|
+/*
|
|
+ * ebt_pkttype
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bdschuym@pandora.be>
|
|
+ *
|
|
+ * April, 2003
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_pkttype.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+static int ebt_filter_pkttype(const struct sk_buff *skb,
|
|
+ const struct net_device *in,
|
|
+ const struct net_device *out,
|
|
+ const void *data,
|
|
+ unsigned int datalen)
|
|
+{
|
|
+ struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
|
|
+
|
|
+ return (skb->pkt_type != info->pkt_type) ^ info->invert;
|
|
+}
|
|
+
|
|
+static int ebt_pkttype_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_pkttype_info)))
|
|
+ return -EINVAL;
|
|
+ if (info->invert != 0 && info->invert != 1)
|
|
+ return -EINVAL;
|
|
+ /* Allow any pkt_type value */
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_pkttype =
|
|
+{
|
|
+ .name = EBT_PKTTYPE_MATCH,
|
|
+ .match = ebt_filter_pkttype,
|
|
+ .check = ebt_pkttype_check,
|
|
+ .me = THIS_MODULE,
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_match(&filter_pkttype);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&filter_pkttype);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_stp.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,191 @@
|
|
+/*
|
|
+ * ebt_stp
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bdschuym@pandora.be>
|
|
+ * Stephen Hemminger <shemminger@osdl.org>
|
|
+ *
|
|
+ * June, 2003
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_stp.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+#define BPDU_TYPE_CONFIG 0
|
|
+#define BPDU_TYPE_TCN 0x80
|
|
+
|
|
+struct stp_header {
|
|
+ uint8_t dsap;
|
|
+ uint8_t ssap;
|
|
+ uint8_t ctrl;
|
|
+ uint8_t pid;
|
|
+ uint8_t vers;
|
|
+ uint8_t type;
|
|
+};
|
|
+
|
|
+struct stp_config_pdu {
|
|
+ uint8_t flags;
|
|
+ uint8_t root[8];
|
|
+ uint8_t root_cost[4];
|
|
+ uint8_t sender[8];
|
|
+ uint8_t port[2];
|
|
+ uint8_t msg_age[2];
|
|
+ uint8_t max_age[2];
|
|
+ uint8_t hello_time[2];
|
|
+ uint8_t forward_delay[2];
|
|
+};
|
|
+
|
|
+#define NR16(p) (p[0] << 8 | p[1])
|
|
+#define NR32(p) ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3])
|
|
+
|
|
+static int ebt_filter_config(struct ebt_stp_info *info,
|
|
+ struct stp_config_pdu *stpc)
|
|
+{
|
|
+ struct ebt_stp_config_info *c;
|
|
+ uint16_t v16;
|
|
+ uint32_t v32;
|
|
+ int verdict, i;
|
|
+
|
|
+ c = &info->config;
|
|
+ if ((info->bitmask & EBT_STP_FLAGS) &&
|
|
+ FWINV(c->flags != stpc->flags, EBT_STP_FLAGS))
|
|
+ return EBT_NOMATCH;
|
|
+ if (info->bitmask & EBT_STP_ROOTPRIO) {
|
|
+ v16 = NR16(stpc->root);
|
|
+ if (FWINV(v16 < c->root_priol ||
|
|
+ v16 > c->root_priou, EBT_STP_ROOTPRIO))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_ROOTADDR) {
|
|
+ verdict = 0;
|
|
+ for (i = 0; i < 6; i++)
|
|
+ verdict |= (stpc->root[2+i] ^ c->root_addr[i]) &
|
|
+ c->root_addrmsk[i];
|
|
+ if (FWINV(verdict != 0, EBT_STP_ROOTADDR))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_ROOTCOST) {
|
|
+ v32 = NR32(stpc->root_cost);
|
|
+ if (FWINV(v32 < c->root_costl ||
|
|
+ v32 > c->root_costu, EBT_STP_ROOTCOST))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_SENDERPRIO) {
|
|
+ v16 = NR16(stpc->sender);
|
|
+ if (FWINV(v16 < c->sender_priol ||
|
|
+ v16 > c->sender_priou, EBT_STP_SENDERPRIO))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_SENDERADDR) {
|
|
+ verdict = 0;
|
|
+ for (i = 0; i < 6; i++)
|
|
+ verdict |= (stpc->sender[2+i] ^ c->sender_addr[i]) &
|
|
+ c->sender_addrmsk[i];
|
|
+ if (FWINV(verdict != 0, EBT_STP_SENDERADDR))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_PORT) {
|
|
+ v16 = NR16(stpc->port);
|
|
+ if (FWINV(v16 < c->portl ||
|
|
+ v16 > c->portu, EBT_STP_PORT))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_MSGAGE) {
|
|
+ v16 = NR16(stpc->msg_age);
|
|
+ if (FWINV(v16 < c->msg_agel ||
|
|
+ v16 > c->msg_ageu, EBT_STP_MSGAGE))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_MAXAGE) {
|
|
+ v16 = NR16(stpc->max_age);
|
|
+ if (FWINV(v16 < c->max_agel ||
|
|
+ v16 > c->max_ageu, EBT_STP_MAXAGE))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_HELLOTIME) {
|
|
+ v16 = NR16(stpc->hello_time);
|
|
+ if (FWINV(v16 < c->hello_timel ||
|
|
+ v16 > c->hello_timeu, EBT_STP_HELLOTIME))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_STP_FWDD) {
|
|
+ v16 = NR16(stpc->forward_delay);
|
|
+ if (FWINV(v16 < c->forward_delayl ||
|
|
+ v16 > c->forward_delayu, EBT_STP_FWDD))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ return EBT_MATCH;
|
|
+}
|
|
+
|
|
+static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out, const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_stp_info *info = (struct ebt_stp_info *)data;
|
|
+ struct stp_header stph;
|
|
+ uint8_t header[6] = {0x42, 0x42, 0x03, 0x00, 0x00, 0x00};
|
|
+ if (skb_copy_bits(skb, 0, &stph, sizeof(stph)))
|
|
+ return EBT_NOMATCH;
|
|
+
|
|
+ /* The stp code only considers these */
|
|
+ if (memcmp(&stph, header, sizeof(header)))
|
|
+ return EBT_NOMATCH;
|
|
+
|
|
+ if (info->bitmask & EBT_STP_TYPE
|
|
+ && FWINV(info->type != stph.type, EBT_STP_TYPE))
|
|
+ return EBT_NOMATCH;
|
|
+
|
|
+ if (stph.type == BPDU_TYPE_CONFIG &&
|
|
+ info->bitmask & EBT_STP_CONFIG_MASK) {
|
|
+ struct stp_config_pdu stpc;
|
|
+
|
|
+ if (skb_copy_bits(skb, sizeof(stph), &stpc, sizeof(stpc)))
|
|
+ return EBT_NOMATCH;
|
|
+ return ebt_filter_config(info, &stpc);
|
|
+ }
|
|
+ return EBT_MATCH;
|
|
+}
|
|
+
|
|
+static int ebt_stp_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_stp_info *info = (struct ebt_stp_info *)data;
|
|
+ int len = EBT_ALIGN(sizeof(struct ebt_stp_info));
|
|
+ uint8_t bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
|
|
+ uint8_t msk[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
|
|
+
|
|
+ if (info->bitmask & ~EBT_STP_MASK || info->invflags & ~EBT_STP_MASK ||
|
|
+ !(info->bitmask & EBT_STP_MASK))
|
|
+ return -EINVAL;
|
|
+ if (datalen != len)
|
|
+ return -EINVAL;
|
|
+ /* Make sure the match only receives stp frames */
|
|
+ if (memcmp(e->destmac, bridge_ula, ETH_ALEN) ||
|
|
+ memcmp(e->destmsk, msk, ETH_ALEN) || !(e->bitmask & EBT_DESTMAC))
|
|
+ return -EINVAL;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_stp =
|
|
+{
|
|
+ .name = EBT_STP_MATCH,
|
|
+ .match = ebt_filter_stp,
|
|
+ .check = ebt_stp_check,
|
|
+ .me = THIS_MODULE,
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_match(&filter_stp);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&filter_stp);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_redirect.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,71 @@
|
|
+/*
|
|
+ * ebt_redirect
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * April, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_redirect.h>
|
|
+#include <linux/module.h>
|
|
+#include <net/sock.h>
|
|
+#include "../br_private.h"
|
|
+
|
|
+static int ebt_target_redirect(struct sk_buff **pskb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
|
|
+
|
|
+ if (hooknr != NF_BR_BROUTING)
|
|
+ memcpy((**pskb).mac.ethernet->h_dest,
|
|
+ in->br_port->br->dev.dev_addr, ETH_ALEN);
|
|
+ else {
|
|
+ memcpy((**pskb).mac.ethernet->h_dest,
|
|
+ in->dev_addr, ETH_ALEN);
|
|
+ (*pskb)->pkt_type = PACKET_HOST;
|
|
+ }
|
|
+ return info->target;
|
|
+}
|
|
+
|
|
+static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_redirect_info)))
|
|
+ return -EINVAL;
|
|
+ if (BASE_CHAIN && info->target == EBT_RETURN)
|
|
+ return -EINVAL;
|
|
+ CLEAR_BASE_CHAIN_BIT;
|
|
+ if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) &&
|
|
+ (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
|
|
+ return -EINVAL;
|
|
+ if (INVALID_TARGET)
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_target redirect_target =
|
|
+{
|
|
+ {NULL, NULL}, EBT_REDIRECT_TARGET, ebt_target_redirect,
|
|
+ ebt_target_redirect_check, NULL, THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_target(&redirect_target);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_target(&redirect_target);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_arp.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,149 @@
|
|
+/*
|
|
+ * ebt_arp
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ * Tim Gardner <timg@tpi.com>
|
|
+ *
|
|
+ * April, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_arp.h>
|
|
+#include <linux/if_arp.h>
|
|
+#include <linux/if_ether.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out, const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_arp_info *info = (struct ebt_arp_info *)data;
|
|
+
|
|
+ if (info->bitmask & EBT_ARP_OPCODE && FWINV(info->opcode !=
|
|
+ ((*skb).nh.arph)->ar_op, EBT_ARP_OPCODE))
|
|
+ return EBT_NOMATCH;
|
|
+ if (info->bitmask & EBT_ARP_HTYPE && FWINV(info->htype !=
|
|
+ ((*skb).nh.arph)->ar_hrd, EBT_ARP_HTYPE))
|
|
+ return EBT_NOMATCH;
|
|
+ if (info->bitmask & EBT_ARP_PTYPE && FWINV(info->ptype !=
|
|
+ ((*skb).nh.arph)->ar_pro, EBT_ARP_PTYPE))
|
|
+ return EBT_NOMATCH;
|
|
+
|
|
+ if (info->bitmask & (EBT_ARP_SRC_IP | EBT_ARP_DST_IP))
|
|
+ {
|
|
+ uint32_t arp_len = sizeof(struct arphdr) +
|
|
+ (2 * (((*skb).nh.arph)->ar_hln)) +
|
|
+ (2 * (((*skb).nh.arph)->ar_pln));
|
|
+ uint32_t dst;
|
|
+ uint32_t src;
|
|
+
|
|
+ // Make sure the packet is long enough.
|
|
+ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
|
|
+ return EBT_NOMATCH;
|
|
+ // IPv4 addresses are always 4 bytes.
|
|
+ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t))
|
|
+ return EBT_NOMATCH;
|
|
+
|
|
+ if (info->bitmask & EBT_ARP_SRC_IP) {
|
|
+ memcpy(&src, ((*skb).nh.raw) + sizeof(struct arphdr) +
|
|
+ ((*skb).nh.arph)->ar_hln, sizeof(uint32_t));
|
|
+ if (FWINV(info->saddr != (src & info->smsk),
|
|
+ EBT_ARP_SRC_IP))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+
|
|
+ if (info->bitmask & EBT_ARP_DST_IP) {
|
|
+ memcpy(&dst, ((*skb).nh.raw)+sizeof(struct arphdr) +
|
|
+ (2*(((*skb).nh.arph)->ar_hln)) +
|
|
+ (((*skb).nh.arph)->ar_pln), sizeof(uint32_t));
|
|
+ if (FWINV(info->daddr != (dst & info->dmsk),
|
|
+ EBT_ARP_DST_IP))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (info->bitmask & (EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC))
|
|
+ {
|
|
+ uint32_t arp_len = sizeof(struct arphdr) +
|
|
+ (2 * (((*skb).nh.arph)->ar_hln)) +
|
|
+ (2 * (((*skb).nh.arph)->ar_pln));
|
|
+ unsigned char dst[ETH_ALEN];
|
|
+ unsigned char src[ETH_ALEN];
|
|
+
|
|
+ // Make sure the packet is long enough.
|
|
+ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
|
|
+ return EBT_NOMATCH;
|
|
+ // MAC addresses are 6 bytes.
|
|
+ if (((*skb).nh.arph)->ar_hln != ETH_ALEN)
|
|
+ return EBT_NOMATCH;
|
|
+ if (info->bitmask & EBT_ARP_SRC_MAC) {
|
|
+ uint8_t verdict, i;
|
|
+
|
|
+ memcpy(&src, ((*skb).nh.raw) +
|
|
+ sizeof(struct arphdr),
|
|
+ ETH_ALEN);
|
|
+ verdict = 0;
|
|
+ for (i = 0; i < 6; i++)
|
|
+ verdict |= (src[i] ^ info->smaddr[i]) &
|
|
+ info->smmsk[i];
|
|
+ if (FWINV(verdict != 0, EBT_ARP_SRC_MAC))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+
|
|
+ if (info->bitmask & EBT_ARP_DST_MAC) {
|
|
+ uint8_t verdict, i;
|
|
+
|
|
+ memcpy(&dst, ((*skb).nh.raw) +
|
|
+ sizeof(struct arphdr) +
|
|
+ (((*skb).nh.arph)->ar_hln) +
|
|
+ (((*skb).nh.arph)->ar_pln),
|
|
+ ETH_ALEN);
|
|
+ verdict = 0;
|
|
+ for (i = 0; i < 6; i++)
|
|
+ verdict |= (dst[i] ^ info->dmaddr[i]) &
|
|
+ info->dmmsk[i];
|
|
+ if (FWINV(verdict != 0, EBT_ARP_DST_MAC))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return EBT_MATCH;
|
|
+}
|
|
+
|
|
+static int ebt_arp_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_arp_info *info = (struct ebt_arp_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_arp_info)))
|
|
+ return -EINVAL;
|
|
+ if ((e->ethproto != __constant_htons(ETH_P_ARP) &&
|
|
+ e->ethproto != __constant_htons(ETH_P_RARP)) ||
|
|
+ e->invflags & EBT_IPROTO)
|
|
+ return -EINVAL;
|
|
+ if (info->bitmask & ~EBT_ARP_MASK || info->invflags & ~EBT_ARP_MASK)
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_arp =
|
|
+{
|
|
+ {NULL, NULL}, EBT_ARP_MATCH, ebt_filter_arp, ebt_arp_check, NULL,
|
|
+ THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_match(&filter_arp);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&filter_arp);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_ip.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,121 @@
|
|
+/*
|
|
+ * ebt_ip
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * April, 2002
|
|
+ *
|
|
+ * Changes:
|
|
+ * added ip-sport and ip-dport
|
|
+ * Innominate Security Technologies AG <mhopf@innominate.com>
|
|
+ * September, 2002
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_ip.h>
|
|
+#include <linux/ip.h>
|
|
+#include <linux/in.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+struct tcpudphdr {
|
|
+ uint16_t src;
|
|
+ uint16_t dst;
|
|
+};
|
|
+
|
|
+union h_u {
|
|
+ unsigned char *raw;
|
|
+ struct tcpudphdr *tuh;
|
|
+};
|
|
+
|
|
+static int ebt_filter_ip(const struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out, const void *data,
|
|
+ unsigned int datalen)
|
|
+{
|
|
+ struct ebt_ip_info *info = (struct ebt_ip_info *)data;
|
|
+
|
|
+ if (info->bitmask & EBT_IP_TOS &&
|
|
+ FWINV(info->tos != ((*skb).nh.iph)->tos, EBT_IP_TOS))
|
|
+ return EBT_NOMATCH;
|
|
+ if (info->bitmask & EBT_IP_PROTO) {
|
|
+ if (FWINV(info->protocol != ((*skb).nh.iph)->protocol,
|
|
+ EBT_IP_PROTO))
|
|
+ return EBT_NOMATCH;
|
|
+ if ( info->protocol == IPPROTO_TCP ||
|
|
+ info->protocol == IPPROTO_UDP )
|
|
+ {
|
|
+ union h_u h;
|
|
+ h.raw = skb->data + skb->nh.iph->ihl*4;
|
|
+ if (info->bitmask & EBT_IP_DPORT) {
|
|
+ uint16_t port = ntohs(h.tuh->dst);
|
|
+ if (FWINV(port < info->dport[0] ||
|
|
+ port > info->dport[1],
|
|
+ EBT_IP_DPORT))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ if (info->bitmask & EBT_IP_SPORT) {
|
|
+ uint16_t port = ntohs(h.tuh->src);
|
|
+ if (FWINV(port < info->sport[0] ||
|
|
+ port > info->sport[1],
|
|
+ EBT_IP_SPORT))
|
|
+ return EBT_NOMATCH;
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+ if (info->bitmask & EBT_IP_SOURCE &&
|
|
+ FWINV((((*skb).nh.iph)->saddr & info->smsk) !=
|
|
+ info->saddr, EBT_IP_SOURCE))
|
|
+ return EBT_NOMATCH;
|
|
+ if ((info->bitmask & EBT_IP_DEST) &&
|
|
+ FWINV((((*skb).nh.iph)->daddr & info->dmsk) !=
|
|
+ info->daddr, EBT_IP_DEST))
|
|
+ return EBT_NOMATCH;
|
|
+ return EBT_MATCH;
|
|
+}
|
|
+
|
|
+static int ebt_ip_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_ip_info *info = (struct ebt_ip_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_ip_info)))
|
|
+ return -EINVAL;
|
|
+ if (e->ethproto != __constant_htons(ETH_P_IP) ||
|
|
+ e->invflags & EBT_IPROTO)
|
|
+ return -EINVAL;
|
|
+ if (info->bitmask & ~EBT_IP_MASK || info->invflags & ~EBT_IP_MASK)
|
|
+ return -EINVAL;
|
|
+ if (info->bitmask & (EBT_IP_DPORT | EBT_IP_SPORT)) {
|
|
+ if (!info->bitmask & EBT_IPROTO)
|
|
+ return -EINVAL;
|
|
+ if (info->protocol != IPPROTO_TCP &&
|
|
+ info->protocol != IPPROTO_UDP)
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ if (info->bitmask & EBT_IP_DPORT && info->dport[0] > info->dport[1])
|
|
+ return -EINVAL;
|
|
+ if (info->bitmask & EBT_IP_SPORT && info->sport[0] > info->sport[1])
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_ip =
|
|
+{
|
|
+ {NULL, NULL}, EBT_IP_MATCH, ebt_filter_ip, ebt_ip_check, NULL,
|
|
+ THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_match(&filter_ip);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&filter_ip);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_vlan.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,259 @@
|
|
+/*
|
|
+ * Description: EBTables 802.1Q match extension kernelspace module.
|
|
+ * Authors: Nick Fedchik <nick@fedchik.org.ua>
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or modify
|
|
+ * it under the terms of the GNU General Public License as published by
|
|
+ * the Free Software Foundation; either version 2 of the License, or
|
|
+ * (at your option) any later version.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ *
|
|
+ * You should have received a copy of the GNU General Public License
|
|
+ * along with this program; if not, write to the Free Software
|
|
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
+ */
|
|
+
|
|
+#include <linux/if_ether.h>
|
|
+#include <linux/if_vlan.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_vlan.h>
|
|
+
|
|
+static unsigned char debug;
|
|
+#define MODULE_VERSION "0.6"
|
|
+
|
|
+MODULE_PARM(debug, "0-1b");
|
|
+MODULE_PARM_DESC(debug, "debug=1 is turn on debug messages");
|
|
+MODULE_AUTHOR("Nick Fedchik <nick@fedchik.org.ua>");
|
|
+MODULE_DESCRIPTION("802.1Q match module (ebtables extension), v"
|
|
+ MODULE_VERSION);
|
|
+MODULE_LICENSE("GPL");
|
|
+
|
|
+
|
|
+#define DEBUG_MSG(args...) if (debug) printk (KERN_DEBUG "ebt_vlan: " args)
|
|
+#define INV_FLAG(_inv_flag_) (info->invflags & _inv_flag_) ? "!" : ""
|
|
+#define GET_BITMASK(_BIT_MASK_) info->bitmask & _BIT_MASK_
|
|
+#define SET_BITMASK(_BIT_MASK_) info->bitmask |= _BIT_MASK_
|
|
+#define EXIT_ON_MISMATCH(_MATCH_,_MASK_) if (!((info->_MATCH_ == _MATCH_)^!!(info->invflags & _MASK_))) return 1;
|
|
+
|
|
+/*
|
|
+ * Function description: ebt_filter_vlan() is main engine for
|
|
+ * checking passed 802.1Q frame according to
|
|
+ * the passed extension parameters (in the *data buffer)
|
|
+ * ebt_filter_vlan() is called after successfull check the rule params
|
|
+ * by ebt_check_vlan() function.
|
|
+ * Parameters:
|
|
+ * const struct sk_buff *skb - pointer to passed ethernet frame buffer
|
|
+ * const void *data - pointer to passed extension parameters
|
|
+ * unsigned int datalen - length of passed *data buffer
|
|
+ * const struct net_device *in -
|
|
+ * const struct net_device *out -
|
|
+ * const struct ebt_counter *c -
|
|
+ * Returned values:
|
|
+ * 0 - ok (all rule params matched)
|
|
+ * 1 - miss (rule params not acceptable to the parsed frame)
|
|
+ */
|
|
+static int
|
|
+ebt_filter_vlan(const struct sk_buff *skb,
|
|
+ const struct net_device *in,
|
|
+ const struct net_device *out,
|
|
+ const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_vlan_info *info = (struct ebt_vlan_info *) data; /* userspace data */
|
|
+ struct vlan_ethhdr *frame = (struct vlan_ethhdr *) skb->mac.raw; /* Passed tagged frame */
|
|
+
|
|
+ unsigned short TCI; /* Whole TCI, given from parsed frame */
|
|
+ unsigned short id; /* VLAN ID, given from frame TCI */
|
|
+ unsigned char prio; /* user_priority, given from frame TCI */
|
|
+ unsigned short encap; /* VLAN encapsulated Type/Length field, given from orig frame */
|
|
+
|
|
+ /*
|
|
+ * Tag Control Information (TCI) consists of the following elements:
|
|
+ * - User_priority. The user_priority field is three bits in length,
|
|
+ * interpreted as a binary number.
|
|
+ * - Canonical Format Indicator (CFI). The Canonical Format Indicator
|
|
+ * (CFI) is a single bit flag value. Currently ignored.
|
|
+ * - VLAN Identifier (VID). The VID is encoded as
|
|
+ * an unsigned binary number.
|
|
+ */
|
|
+ TCI = ntohs(frame->h_vlan_TCI);
|
|
+ id = TCI & VLAN_VID_MASK;
|
|
+ prio = (TCI >> 13) & 0x7;
|
|
+ encap = frame->h_vlan_encapsulated_proto;
|
|
+
|
|
+ /*
|
|
+ * Checking VLAN Identifier (VID)
|
|
+ */
|
|
+ if (GET_BITMASK(EBT_VLAN_ID)) { /* Is VLAN ID parsed? */
|
|
+ EXIT_ON_MISMATCH(id, EBT_VLAN_ID);
|
|
+ }
|
|
+ /*
|
|
+ * Checking user_priority
|
|
+ */
|
|
+ if (GET_BITMASK(EBT_VLAN_PRIO)) { /* Is VLAN user_priority parsed? */
|
|
+ EXIT_ON_MISMATCH(prio, EBT_VLAN_PRIO);
|
|
+ }
|
|
+ /*
|
|
+ * Checking Encapsulated Proto (Length/Type) field
|
|
+ */
|
|
+ if (GET_BITMASK(EBT_VLAN_ENCAP)) { /* Is VLAN Encap parsed? */
|
|
+ EXIT_ON_MISMATCH(encap, EBT_VLAN_ENCAP);
|
|
+ }
|
|
+ /*
|
|
+ * All possible extension parameters was parsed.
|
|
+ * If rule never returned by missmatch, then all ok.
|
|
+ */
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*
|
|
+ * Function description: ebt_vlan_check() is called when userspace
|
|
+ * delivers the table entry to the kernel,
|
|
+ * and to check that userspace doesn't give a bad table.
|
|
+ * Parameters:
|
|
+ * const char *tablename - table name string
|
|
+ * unsigned int hooknr - hook number
|
|
+ * const struct ebt_entry *e - ebtables entry basic set
|
|
+ * const void *data - pointer to passed extension parameters
|
|
+ * unsigned int datalen - length of passed *data buffer
|
|
+ * Returned values:
|
|
+ * 0 - ok (all delivered rule params are correct)
|
|
+ * 1 - miss (rule params is out of range, invalid, incompatible, etc.)
|
|
+ */
|
|
+static int
|
|
+ebt_check_vlan(const char *tablename,
|
|
+ unsigned int hooknr,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_vlan_info *info = (struct ebt_vlan_info *) data;
|
|
+
|
|
+ /*
|
|
+ * Parameters buffer overflow check
|
|
+ */
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_vlan_info))) {
|
|
+ DEBUG_MSG
|
|
+ ("passed size %d is not eq to ebt_vlan_info (%d)\n",
|
|
+ datalen, sizeof(struct ebt_vlan_info));
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * Is it 802.1Q frame checked?
|
|
+ */
|
|
+ if (e->ethproto != __constant_htons(ETH_P_8021Q)) {
|
|
+ DEBUG_MSG
|
|
+ ("passed entry proto %2.4X is not 802.1Q (8100)\n",
|
|
+ (unsigned short) ntohs(e->ethproto));
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * Check for bitmask range
|
|
+ * True if even one bit is out of mask
|
|
+ */
|
|
+ if (info->bitmask & ~EBT_VLAN_MASK) {
|
|
+ DEBUG_MSG("bitmask %2X is out of mask (%2X)\n",
|
|
+ info->bitmask, EBT_VLAN_MASK);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * Check for inversion flags range
|
|
+ */
|
|
+ if (info->invflags & ~EBT_VLAN_MASK) {
|
|
+ DEBUG_MSG("inversion flags %2X is out of mask (%2X)\n",
|
|
+ info->invflags, EBT_VLAN_MASK);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * Reserved VLAN ID (VID) values
|
|
+ * -----------------------------
|
|
+ * 0 - The null VLAN ID.
|
|
+ * 1 - The default Port VID (PVID)
|
|
+ * 0x0FFF - Reserved for implementation use.
|
|
+ * if_vlan.h: VLAN_GROUP_ARRAY_LEN 4096.
|
|
+ */
|
|
+ if (GET_BITMASK(EBT_VLAN_ID)) { /* when vlan-id param was spec-ed */
|
|
+ if (!!info->id) { /* if id!=0 => check vid range */
|
|
+ if (info->id > VLAN_GROUP_ARRAY_LEN) {
|
|
+ DEBUG_MSG
|
|
+ ("id %d is out of range (1-4096)\n",
|
|
+ info->id);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ /*
|
|
+ * Note: This is valid VLAN-tagged frame point.
|
|
+ * Any value of user_priority are acceptable,
|
|
+ * but should be ignored according to 802.1Q Std.
|
|
+ * So we just drop the prio flag.
|
|
+ */
|
|
+ info->bitmask &= ~EBT_VLAN_PRIO;
|
|
+ }
|
|
+ /*
|
|
+ * Else, id=0 (null VLAN ID) => user_priority range (any?)
|
|
+ */
|
|
+ }
|
|
+
|
|
+ if (GET_BITMASK(EBT_VLAN_PRIO)) {
|
|
+ if ((unsigned char) info->prio > 7) {
|
|
+ DEBUG_MSG
|
|
+ ("prio %d is out of range (0-7)\n",
|
|
+ info->prio);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ }
|
|
+ /*
|
|
+ * Check for encapsulated proto range - it is possible to be
|
|
+ * any value for u_short range.
|
|
+ * if_ether.h: ETH_ZLEN 60 - Min. octets in frame sans FCS
|
|
+ */
|
|
+ if (GET_BITMASK(EBT_VLAN_ENCAP)) {
|
|
+ if ((unsigned short) ntohs(info->encap) < ETH_ZLEN) {
|
|
+ DEBUG_MSG
|
|
+ ("encap frame length %d is less than minimal\n",
|
|
+ ntohs(info->encap));
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_match filter_vlan = {
|
|
+ {NULL, NULL},
|
|
+ EBT_VLAN_MATCH,
|
|
+ ebt_filter_vlan,
|
|
+ ebt_check_vlan,
|
|
+ NULL,
|
|
+ THIS_MODULE
|
|
+};
|
|
+
|
|
+/*
|
|
+ * Module initialization function.
|
|
+ */
|
|
+static int __init init(void)
|
|
+{
|
|
+ DEBUG_MSG("ebtables 802.1Q extension module v"
|
|
+ MODULE_VERSION "\n");
|
|
+ DEBUG_MSG("module debug=%d\n", !!debug);
|
|
+ return ebt_register_match(&filter_vlan);
|
|
+}
|
|
+
|
|
+/*
|
|
+ * Module "finalization" function
|
|
+ */
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_match(&filter_vlan);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+
|
|
+EXPORT_NO_SYMBOLS;
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_log.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,153 @@
|
|
+/*
|
|
+ * ebt_log
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * April, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_log.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/ip.h>
|
|
+#include <linux/in.h>
|
|
+#include <linux/if_arp.h>
|
|
+#include <linux/spinlock.h>
|
|
+
|
|
+static spinlock_t ebt_log_lock = SPIN_LOCK_UNLOCKED;
|
|
+
|
|
+static int ebt_log_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_log_info *info = (struct ebt_log_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_log_info)))
|
|
+ return -EINVAL;
|
|
+ if (info->bitmask & ~EBT_LOG_MASK)
|
|
+ return -EINVAL;
|
|
+ if (info->loglevel >= 8)
|
|
+ return -EINVAL;
|
|
+ info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+struct tcpudphdr
|
|
+{
|
|
+ uint16_t src;
|
|
+ uint16_t dst;
|
|
+};
|
|
+
|
|
+struct arppayload
|
|
+{
|
|
+ unsigned char mac_src[ETH_ALEN];
|
|
+ unsigned char ip_src[4];
|
|
+ unsigned char mac_dst[ETH_ALEN];
|
|
+ unsigned char ip_dst[4];
|
|
+};
|
|
+
|
|
+static void print_MAC(unsigned char *p)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; i < ETH_ALEN; i++, p++)
|
|
+ printk("%02x%c", *p, i == ETH_ALEN - 1 ? ' ':':');
|
|
+}
|
|
+
|
|
+#define myNIPQUAD(a) a[0], a[1], a[2], a[3]
|
|
+static void ebt_log(const struct sk_buff *skb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_log_info *info = (struct ebt_log_info *)data;
|
|
+ char level_string[4] = "< >";
|
|
+ level_string[1] = '0' + info->loglevel;
|
|
+
|
|
+ spin_lock_bh(&ebt_log_lock);
|
|
+ printk(level_string);
|
|
+ printk("%s IN=%s OUT=%s ", info->prefix, in ? in->name : "",
|
|
+ out ? out->name : "");
|
|
+
|
|
+ printk("MAC source = ");
|
|
+ print_MAC((skb->mac.ethernet)->h_source);
|
|
+ printk("MAC dest = ");
|
|
+ print_MAC((skb->mac.ethernet)->h_dest);
|
|
+
|
|
+ printk("proto = 0x%04x", ntohs(((*skb).mac.ethernet)->h_proto));
|
|
+
|
|
+ if ((info->bitmask & EBT_LOG_IP) && skb->mac.ethernet->h_proto ==
|
|
+ htons(ETH_P_IP)){
|
|
+ struct iphdr *iph = skb->nh.iph;
|
|
+ printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u,",
|
|
+ NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
|
|
+ printk(" IP tos=0x%02X, IP proto=%d", iph->tos, iph->protocol);
|
|
+ if (iph->protocol == IPPROTO_TCP ||
|
|
+ iph->protocol == IPPROTO_UDP) {
|
|
+ struct tcpudphdr *ports = (struct tcpudphdr *)(skb->data + iph->ihl*4);
|
|
+
|
|
+ if (skb->data + iph->ihl*4 > skb->tail) {
|
|
+ printk(" INCOMPLETE TCP/UDP header");
|
|
+ goto out;
|
|
+ }
|
|
+ printk(" SPT=%u DPT=%u", ntohs(ports->src),
|
|
+ ntohs(ports->dst));
|
|
+ }
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ if ((info->bitmask & EBT_LOG_ARP) &&
|
|
+ ((skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) ||
|
|
+ (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_RARP)))) {
|
|
+ struct arphdr * arph = skb->nh.arph;
|
|
+ printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
|
|
+ ntohs(arph->ar_hrd), ntohs(arph->ar_pro),
|
|
+ ntohs(arph->ar_op));
|
|
+ /* If it's for Ethernet and the lengths are OK,
|
|
+ * then log the ARP payload */
|
|
+ if (arph->ar_hrd == __constant_htons(1) &&
|
|
+ arph->ar_hln == ETH_ALEN &&
|
|
+ arph->ar_pln == sizeof(uint32_t)) {
|
|
+ struct arppayload *arpp = (struct arppayload *)(skb->data + sizeof(*arph));
|
|
+
|
|
+ if (skb->data + sizeof(*arph) > skb->tail) {
|
|
+ printk(" INCOMPLETE ARP header");
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ printk(" ARP MAC SRC=");
|
|
+ print_MAC(arpp->mac_src);
|
|
+ printk(" ARP IP SRC=%u.%u.%u.%u",
|
|
+ myNIPQUAD(arpp->ip_src));
|
|
+ printk(" ARP MAC DST=");
|
|
+ print_MAC(arpp->mac_dst);
|
|
+ printk(" ARP IP DST=%u.%u.%u.%u",
|
|
+ myNIPQUAD(arpp->ip_dst));
|
|
+ }
|
|
+
|
|
+ }
|
|
+out:
|
|
+ printk("\n");
|
|
+ spin_unlock_bh(&ebt_log_lock);
|
|
+}
|
|
+
|
|
+static struct ebt_watcher log =
|
|
+{
|
|
+ {NULL, NULL}, EBT_LOG_WATCHER, ebt_log, ebt_log_check, NULL,
|
|
+ THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_watcher(&log);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_watcher(&log);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_ulog.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,281 @@
|
|
+/*
|
|
+ * netfilter module for userspace bridged Ethernet frames logging daemons
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bdschuym@pandora.be>
|
|
+ *
|
|
+ * November, 2004
|
|
+ *
|
|
+ * Based on ipt_ULOG.c, which is
|
|
+ * (C) 2000-2002 by Harald Welte <laforge@netfilter.org>
|
|
+ *
|
|
+ * This module accepts two parameters:
|
|
+ *
|
|
+ * nlbufsiz:
|
|
+ * The parameter specifies how big the buffer for each netlink multicast
|
|
+ * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
|
|
+ * get accumulated in the kernel until they are sent to userspace. It is
|
|
+ * NOT possible to allocate more than 128kB, and it is strongly discouraged,
|
|
+ * because atomically allocating 128kB inside the network rx softirq is not
|
|
+ * reliable. Please also keep in mind that this buffer size is allocated for
|
|
+ * each nlgroup you are using, so the total kernel memory usage increases
|
|
+ * by that factor.
|
|
+ *
|
|
+ * flushtimeout:
|
|
+ * Specify, after how many hundredths of a second the queue should be
|
|
+ * flushed even if it is not full yet.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/module.h>
|
|
+#include <linux/config.h>
|
|
+#include <linux/spinlock.h>
|
|
+#include <linux/socket.h>
|
|
+#include <linux/skbuff.h>
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/timer.h>
|
|
+#include <linux/netlink.h>
|
|
+#include <linux/netdevice.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_ulog.h>
|
|
+#include <net/sock.h>
|
|
+#include "../br_private.h"
|
|
+
|
|
+#define PRINTR(format, args...) do { if (net_ratelimit()) \
|
|
+ printk(format , ## args); } while (0)
|
|
+
|
|
+static unsigned int nlbufsiz = 4096;
|
|
+MODULE_PARM(nlbufsiz, "i");
|
|
+MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) "
|
|
+ "(defaults to 4096)");
|
|
+
|
|
+static unsigned int flushtimeout = 10;
|
|
+MODULE_PARM(flushtimeout, "i");
|
|
+MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second) "
|
|
+ "(defaults to 10)");
|
|
+
|
|
+typedef struct {
|
|
+ unsigned int qlen; /* number of nlmsgs' in the skb */
|
|
+ struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
|
|
+ struct sk_buff *skb; /* the pre-allocated skb */
|
|
+ struct timer_list timer; /* the timer function */
|
|
+ spinlock_t lock; /* the per-queue lock */
|
|
+} ebt_ulog_buff_t;
|
|
+
|
|
+static ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS];
|
|
+static struct sock *ebtlognl;
|
|
+
|
|
+/* send one ulog_buff_t to userspace */
|
|
+static void ulog_send(unsigned int nlgroup)
|
|
+{
|
|
+ ebt_ulog_buff_t *ub = &ulog_buffers[nlgroup];
|
|
+
|
|
+ if (timer_pending(&ub->timer))
|
|
+ del_timer(&ub->timer);
|
|
+
|
|
+ /* last nlmsg needs NLMSG_DONE */
|
|
+ if (ub->qlen > 1)
|
|
+ ub->lastnlh->nlmsg_type = NLMSG_DONE;
|
|
+
|
|
+ NETLINK_CB(ub->skb).dst_groups = 1 << nlgroup;
|
|
+ netlink_broadcast(ebtlognl, ub->skb, 0, 1 << nlgroup, GFP_ATOMIC);
|
|
+
|
|
+ ub->qlen = 0;
|
|
+ ub->skb = NULL;
|
|
+}
|
|
+
|
|
+/* timer function to flush queue in flushtimeout time */
|
|
+static void ulog_timer(unsigned long data)
|
|
+{
|
|
+ spin_lock_bh(&ulog_buffers[data].lock);
|
|
+ if (ulog_buffers[data].skb)
|
|
+ ulog_send(data);
|
|
+ spin_unlock_bh(&ulog_buffers[data].lock);
|
|
+}
|
|
+
|
|
+static struct sk_buff *ulog_alloc_skb(unsigned int size)
|
|
+{
|
|
+ struct sk_buff *skb;
|
|
+
|
|
+ skb = alloc_skb(nlbufsiz, GFP_ATOMIC);
|
|
+ if (!skb) {
|
|
+ PRINTR(KERN_ERR "ebt_ulog: can't alloc whole buffer "
|
|
+ "of size %ub!\n", nlbufsiz);
|
|
+ if (size < nlbufsiz) {
|
|
+ /* try to allocate only as much as we need for
|
|
+ * current packet */
|
|
+ skb = alloc_skb(size, GFP_ATOMIC);
|
|
+ if (!skb)
|
|
+ PRINTR(KERN_ERR "ebt_ulog: can't even allocate "
|
|
+ "buffer of size %ub\n", size);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return skb;
|
|
+}
|
|
+
|
|
+static void ebt_ulog(const struct sk_buff *skb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *data, unsigned int datalen)
|
|
+{
|
|
+ ebt_ulog_packet_msg_t *pm;
|
|
+ size_t size, copy_len;
|
|
+ struct nlmsghdr *nlh;
|
|
+ struct ebt_ulog_info *loginfo = (struct ebt_ulog_info *)data;
|
|
+ unsigned int group = loginfo->nlgroup;
|
|
+ ebt_ulog_buff_t *ub = &ulog_buffers[group];
|
|
+ spinlock_t *lock = &ub->lock;
|
|
+
|
|
+ if ((loginfo->cprange == 0) ||
|
|
+ (loginfo->cprange > skb->len + ETH_HLEN))
|
|
+ copy_len = skb->len + ETH_HLEN;
|
|
+ else
|
|
+ copy_len = loginfo->cprange;
|
|
+
|
|
+ size = NLMSG_SPACE(sizeof(*pm) + copy_len);
|
|
+
|
|
+ spin_lock_bh(lock);
|
|
+
|
|
+ if (!ub->skb) {
|
|
+ if (!(ub->skb = ulog_alloc_skb(size)))
|
|
+ goto alloc_failure;
|
|
+ } else if (size > skb_tailroom(ub->skb)) {
|
|
+ ulog_send(group);
|
|
+
|
|
+ if (!(ub->skb = ulog_alloc_skb(size)))
|
|
+ goto alloc_failure;
|
|
+ }
|
|
+
|
|
+ nlh = NLMSG_PUT(ub->skb, 0, ub->qlen, 0,
|
|
+ size - NLMSG_ALIGN(sizeof(*nlh)));
|
|
+ ub->qlen++;
|
|
+
|
|
+ pm = NLMSG_DATA(nlh);
|
|
+
|
|
+ /* Fill in the ulog data */
|
|
+ do_gettimeofday(&pm->stamp);
|
|
+ if (ub->qlen == 1)
|
|
+ ub->skb->stamp = pm->stamp;
|
|
+ pm->data_len = copy_len;
|
|
+ pm->mark = skb->nfmark;
|
|
+ pm->hook = hooknr;
|
|
+ if (loginfo->prefix != NULL)
|
|
+ strcpy(pm->prefix, loginfo->prefix);
|
|
+ else
|
|
+ *(pm->prefix) = '\0';
|
|
+
|
|
+ if (in) {
|
|
+ strcpy(pm->physindev, in->name);
|
|
+ strcpy(pm->indev, in->br_port->br->dev.name);
|
|
+ } else
|
|
+ pm->indev[0] = pm->physindev[0] = '\0';
|
|
+
|
|
+ if (out) {
|
|
+ strcpy(pm->physoutdev, out->name);
|
|
+ strcpy(pm->outdev, out->br_port->br->dev.name);
|
|
+ } else
|
|
+ pm->outdev[0] = pm->physoutdev[0] = '\0';
|
|
+
|
|
+ if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0)
|
|
+ BUG();
|
|
+
|
|
+ if (ub->qlen > 1)
|
|
+ ub->lastnlh->nlmsg_flags |= NLM_F_MULTI;
|
|
+
|
|
+ ub->lastnlh = nlh;
|
|
+
|
|
+ if (ub->qlen >= loginfo->qthreshold)
|
|
+ ulog_send(group);
|
|
+ else if (!timer_pending(&ub->timer)) {
|
|
+ ub->timer.expires = jiffies + flushtimeout * HZ / 100;
|
|
+ add_timer(&ub->timer);
|
|
+ }
|
|
+
|
|
+unlock:
|
|
+ spin_unlock_bh(lock);
|
|
+
|
|
+ return;
|
|
+
|
|
+nlmsg_failure:
|
|
+ PRINTR(KERN_ERR "ebt_ULOG: error during NLMSG_PUT.\n");
|
|
+ goto unlock;
|
|
+alloc_failure:
|
|
+ goto unlock;
|
|
+}
|
|
+
|
|
+static int ebt_ulog_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_ulog_info *loginfo = (struct ebt_ulog_info *)data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_ulog_info)) ||
|
|
+ loginfo->nlgroup > 31)
|
|
+ return -EINVAL;
|
|
+
|
|
+ loginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0';
|
|
+
|
|
+ if (loginfo->qthreshold > EBT_ULOG_MAX_QLEN)
|
|
+ loginfo->qthreshold = EBT_ULOG_MAX_QLEN;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_watcher ulog = {
|
|
+ {NULL, NULL}, EBT_ULOG_WATCHER, ebt_ulog, ebt_ulog_check, NULL,
|
|
+ THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ int i, ret = 0;
|
|
+
|
|
+ if (nlbufsiz >= 128*1024) {
|
|
+ printk(KERN_NOTICE "ebt_ulog: Netlink buffer has to be <= 128kB,"
|
|
+ " please try a smaller nlbufsiz parameter.\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ /* initialize ulog_buffers */
|
|
+ for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
|
|
+ init_timer(&ulog_buffers[i].timer);
|
|
+ ulog_buffers[i].timer.function = ulog_timer;
|
|
+ ulog_buffers[i].timer.data = i;
|
|
+ ulog_buffers[i].lock = SPIN_LOCK_UNLOCKED;
|
|
+ }
|
|
+
|
|
+ ebtlognl = netlink_kernel_create(NETLINK_NFLOG, NULL);
|
|
+ if (!ebtlognl)
|
|
+ ret = -ENOMEM;
|
|
+ else if ((ret = ebt_register_watcher(&ulog)))
|
|
+ sock_release(ebtlognl->socket);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_ulog_buff_t *ub;
|
|
+ int i;
|
|
+
|
|
+ ebt_unregister_watcher(&ulog);
|
|
+ for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
|
|
+ ub = &ulog_buffers[i];
|
|
+ if (timer_pending(&ub->timer))
|
|
+ del_timer(&ub->timer);
|
|
+ spin_lock_bh(&ub->lock);
|
|
+ if (ub->skb) {
|
|
+ kfree_skb(ub->skb);
|
|
+ ub->skb = NULL;
|
|
+ }
|
|
+ spin_unlock_bh(&ub->lock);
|
|
+ }
|
|
+ sock_release(ebtlognl->socket);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
|
|
+MODULE_DESCRIPTION("ebtables userspace logging module for bridged Ethernet"
|
|
+ " frames");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_snat.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,64 @@
|
|
+/*
|
|
+ * ebt_snat
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * June, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_nat.h>
|
|
+#include <linux/module.h>
|
|
+
|
|
+static int ebt_target_snat(struct sk_buff **pskb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_nat_info *info = (struct ebt_nat_info *) data;
|
|
+
|
|
+ memcpy(((**pskb).mac.ethernet)->h_source, info->mac,
|
|
+ ETH_ALEN * sizeof(unsigned char));
|
|
+ return info->target;
|
|
+}
|
|
+
|
|
+static int ebt_target_snat_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_nat_info *info = (struct ebt_nat_info *) data;
|
|
+
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
|
|
+ return -EINVAL;
|
|
+ if (BASE_CHAIN && info->target == EBT_RETURN)
|
|
+ return -EINVAL;
|
|
+ CLEAR_BASE_CHAIN_BIT;
|
|
+ if (strcmp(tablename, "nat"))
|
|
+ return -EINVAL;
|
|
+ if (hookmask & ~(1 << NF_BR_POST_ROUTING))
|
|
+ return -EINVAL;
|
|
+ if (INVALID_TARGET)
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_target snat =
|
|
+{
|
|
+ {NULL, NULL}, EBT_SNAT_TARGET, ebt_target_snat, ebt_target_snat_check,
|
|
+ NULL, THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_target(&snat);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_target(&snat);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebt_dnat.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,65 @@
|
|
+/*
|
|
+ * ebt_dnat
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * June, 2002
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/netfilter_bridge/ebt_nat.h>
|
|
+#include <linux/module.h>
|
|
+#include <net/sock.h>
|
|
+
|
|
+static int ebt_target_dnat(struct sk_buff **pskb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_nat_info *info = (struct ebt_nat_info *)data;
|
|
+
|
|
+ memcpy(((**pskb).mac.ethernet)->h_dest, info->mac,
|
|
+ ETH_ALEN * sizeof(unsigned char));
|
|
+ return info->target;
|
|
+}
|
|
+
|
|
+static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *data, unsigned int datalen)
|
|
+{
|
|
+ struct ebt_nat_info *info = (struct ebt_nat_info *)data;
|
|
+
|
|
+ if (BASE_CHAIN && info->target == EBT_RETURN)
|
|
+ return -EINVAL;
|
|
+ CLEAR_BASE_CHAIN_BIT;
|
|
+ if ( (strcmp(tablename, "nat") ||
|
|
+ (hookmask & ~((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT)))) &&
|
|
+ (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
|
|
+ return -EINVAL;
|
|
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
|
|
+ return -EINVAL;
|
|
+ if (INVALID_TARGET)
|
|
+ return -EINVAL;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct ebt_target dnat =
|
|
+{
|
|
+ {NULL, NULL}, EBT_DNAT_TARGET, ebt_target_dnat, ebt_target_dnat_check,
|
|
+ NULL, THIS_MODULE
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ebt_register_target(&dnat);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ebt_unregister_target(&dnat);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+EXPORT_NO_SYMBOLS;
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/netfilter/ebtables.c 2005-03-14 21:04:05.155913576 +0100
|
|
@@ -0,0 +1,1497 @@
|
|
+/*
|
|
+ * ebtables
|
|
+ *
|
|
+ * Author:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * ebtables.c,v 2.0, July, 2002
|
|
+ *
|
|
+ * This code is stongly inspired on the iptables code which is
|
|
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or
|
|
+ * modify it under the terms of the GNU General Public License
|
|
+ * as published by the Free Software Foundation; either version
|
|
+ * 2 of the License, or (at your option) any later version.
|
|
+ */
|
|
+
|
|
+// used for print_string
|
|
+#include <linux/sched.h>
|
|
+#include <linux/tty.h>
|
|
+
|
|
+#include <linux/kmod.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/vmalloc.h>
|
|
+#include <linux/netfilter_bridge/ebtables.h>
|
|
+#include <linux/spinlock.h>
|
|
+#include <asm/uaccess.h>
|
|
+#include <linux/smp.h>
|
|
+#include <net/sock.h>
|
|
+// needed for logical [in,out]-dev filtering
|
|
+#include "../br_private.h"
|
|
+
|
|
+// list_named_find
|
|
+#define ASSERT_READ_LOCK(x)
|
|
+#define ASSERT_WRITE_LOCK(x)
|
|
+#include <linux/netfilter_ipv4/listhelp.h>
|
|
+
|
|
+#if 0 // use this for remote debugging
|
|
+// Copyright (C) 1998 by Ori Pomerantz
|
|
+// Print the string to the appropriate tty, the one
|
|
+// the current task uses
|
|
+static void print_string(char *str)
|
|
+{
|
|
+ struct tty_struct *my_tty;
|
|
+
|
|
+ /* The tty for the current task */
|
|
+ my_tty = current->tty;
|
|
+ if (my_tty != NULL) {
|
|
+ (*(my_tty->driver).write)(my_tty, 0, str, strlen(str));
|
|
+ (*(my_tty->driver).write)(my_tty, 0, "\015\012", 2);
|
|
+ }
|
|
+}
|
|
+
|
|
+#define BUGPRINT(args) print_string(args);
|
|
+#else
|
|
+#define BUGPRINT(format, args...) printk("kernel msg: ebtables bug: please "\
|
|
+ "report to author: "format, ## args)
|
|
+// #define BUGPRINT(format, args...)
|
|
+#endif
|
|
+#define MEMPRINT(format, args...) printk("kernel msg: ebtables "\
|
|
+ ": out of memory: "format, ## args)
|
|
+// #define MEMPRINT(format, args...)
|
|
+
|
|
+
|
|
+
|
|
+// Each cpu has its own set of counters, so there is no need for write_lock in
|
|
+// the softirq
|
|
+// For reading or updating the counters, the user context needs to
|
|
+// get a write_lock
|
|
+
|
|
+// The size of each set of counters is altered to get cache alignment
|
|
+#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
|
|
+#define COUNTER_OFFSET(n) (SMP_ALIGN(n * sizeof(struct ebt_counter)))
|
|
+#define COUNTER_BASE(c, n, cpu) ((struct ebt_counter *)(((char *)c) + \
|
|
+ COUNTER_OFFSET(n) * cpu))
|
|
+
|
|
+
|
|
+
|
|
+static DECLARE_MUTEX(ebt_mutex);
|
|
+static LIST_HEAD(ebt_tables);
|
|
+static LIST_HEAD(ebt_targets);
|
|
+static LIST_HEAD(ebt_matches);
|
|
+static LIST_HEAD(ebt_watchers);
|
|
+
|
|
+static struct ebt_target ebt_standard_target =
|
|
+{ {NULL, NULL}, EBT_STANDARD_TARGET, NULL, NULL, NULL, NULL};
|
|
+
|
|
+static inline int ebt_do_watcher (struct ebt_entry_watcher *w,
|
|
+ const struct sk_buff *skb, unsigned int hooknr, const struct net_device *in,
|
|
+ const struct net_device *out)
|
|
+{
|
|
+ w->u.watcher->watcher(skb, hooknr, in, out, w->data,
|
|
+ w->watcher_size);
|
|
+ // watchers don't give a verdict
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline int ebt_do_match (struct ebt_entry_match *m,
|
|
+ const struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out)
|
|
+{
|
|
+ return m->u.match->match(skb, in, out, m->data,
|
|
+ m->match_size);
|
|
+}
|
|
+
|
|
+static inline int ebt_dev_check(char *entry, const struct net_device *device)
|
|
+{
|
|
+ int i = 0;
|
|
+ char *devname = device->name;
|
|
+
|
|
+ if (*entry == '\0')
|
|
+ return 0;
|
|
+ if (!device)
|
|
+ return 1;
|
|
+ /* 1 is the wildcard token */
|
|
+ while (entry[i] != '\0' && entry[i] != 1 && entry[i] == devname[i])
|
|
+ i++;
|
|
+ return (devname[i] != entry[i] && entry[i] != 1);
|
|
+}
|
|
+
|
|
+#define FWINV2(bool,invflg) ((bool) ^ !!(e->invflags & invflg))
|
|
+// process standard matches
|
|
+static inline int ebt_basic_match(struct ebt_entry *e, struct ethhdr *h,
|
|
+ const struct net_device *in, const struct net_device *out)
|
|
+{
|
|
+ int verdict, i;
|
|
+
|
|
+ if (e->bitmask & EBT_802_3) {
|
|
+ if (FWINV2(ntohs(h->h_proto) >= 1536, EBT_IPROTO))
|
|
+ return 1;
|
|
+ } else if (!(e->bitmask & EBT_NOPROTO) &&
|
|
+ FWINV2(e->ethproto != h->h_proto, EBT_IPROTO))
|
|
+ return 1;
|
|
+
|
|
+ if (FWINV2(ebt_dev_check(e->in, in), EBT_IIN))
|
|
+ return 1;
|
|
+ if (FWINV2(ebt_dev_check(e->out, out), EBT_IOUT))
|
|
+ return 1;
|
|
+ if ((!in || !in->br_port) ? 0 : FWINV2(ebt_dev_check(
|
|
+ e->logical_in, &in->br_port->br->dev), EBT_ILOGICALIN))
|
|
+ return 1;
|
|
+ if ((!out || !out->br_port) ? 0 : FWINV2(ebt_dev_check(
|
|
+ e->logical_out, &out->br_port->br->dev), EBT_ILOGICALOUT))
|
|
+ return 1;
|
|
+
|
|
+ if (e->bitmask & EBT_SOURCEMAC) {
|
|
+ verdict = 0;
|
|
+ for (i = 0; i < 6; i++)
|
|
+ verdict |= (h->h_source[i] ^ e->sourcemac[i]) &
|
|
+ e->sourcemsk[i];
|
|
+ if (FWINV2(verdict != 0, EBT_ISOURCE) )
|
|
+ return 1;
|
|
+ }
|
|
+ if (e->bitmask & EBT_DESTMAC) {
|
|
+ verdict = 0;
|
|
+ for (i = 0; i < 6; i++)
|
|
+ verdict |= (h->h_dest[i] ^ e->destmac[i]) &
|
|
+ e->destmsk[i];
|
|
+ if (FWINV2(verdict != 0, EBT_IDEST) )
|
|
+ return 1;
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+// Do some firewalling
|
|
+unsigned int ebt_do_table (unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ struct ebt_table *table)
|
|
+{
|
|
+ int i, nentries;
|
|
+ struct ebt_entry *point;
|
|
+ struct ebt_counter *counter_base, *cb_base;
|
|
+ struct ebt_entry_target *t;
|
|
+ int verdict, sp = 0;
|
|
+ struct ebt_chainstack *cs;
|
|
+ struct ebt_entries *chaininfo;
|
|
+ char *base;
|
|
+ struct ebt_table_info *private;
|
|
+
|
|
+ read_lock_bh(&table->lock);
|
|
+ private = table->private;
|
|
+ cb_base = COUNTER_BASE(private->counters, private->nentries,
|
|
+ cpu_number_map(smp_processor_id()));
|
|
+ if (private->chainstack)
|
|
+ cs = private->chainstack[cpu_number_map(smp_processor_id())];
|
|
+ else
|
|
+ cs = NULL;
|
|
+ chaininfo = private->hook_entry[hook];
|
|
+ nentries = private->hook_entry[hook]->nentries;
|
|
+ point = (struct ebt_entry *)(private->hook_entry[hook]->data);
|
|
+ counter_base = cb_base + private->hook_entry[hook]->counter_offset;
|
|
+ // base for chain jumps
|
|
+ base = private->entries;
|
|
+ i = 0;
|
|
+ while (i < nentries) {
|
|
+ if (ebt_basic_match(point, (**pskb).mac.ethernet, in, out))
|
|
+ goto letscontinue;
|
|
+
|
|
+ if (EBT_MATCH_ITERATE(point, ebt_do_match, *pskb, in, out) != 0)
|
|
+ goto letscontinue;
|
|
+
|
|
+ // increase counter
|
|
+ (*(counter_base + i)).pcnt++;
|
|
+ (*(counter_base + i)).bcnt+=(**pskb).len;
|
|
+
|
|
+ // these should only watch: not modify, nor tell us
|
|
+ // what to do with the packet
|
|
+ EBT_WATCHER_ITERATE(point, ebt_do_watcher, *pskb, hook, in,
|
|
+ out);
|
|
+
|
|
+ t = (struct ebt_entry_target *)
|
|
+ (((char *)point) + point->target_offset);
|
|
+ // standard target
|
|
+ if (!t->u.target->target)
|
|
+ verdict = ((struct ebt_standard_target *)t)->verdict;
|
|
+ else
|
|
+ verdict = t->u.target->target(pskb, hook,
|
|
+ in, out, t->data, t->target_size);
|
|
+ if (verdict == EBT_ACCEPT) {
|
|
+ read_unlock_bh(&table->lock);
|
|
+ return NF_ACCEPT;
|
|
+ }
|
|
+ if (verdict == EBT_DROP) {
|
|
+ read_unlock_bh(&table->lock);
|
|
+ return NF_DROP;
|
|
+ }
|
|
+ if (verdict == EBT_RETURN) {
|
|
+letsreturn:
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ if (sp == 0) {
|
|
+ BUGPRINT("RETURN on base chain");
|
|
+ // act like this is EBT_CONTINUE
|
|
+ goto letscontinue;
|
|
+ }
|
|
+#endif
|
|
+ sp--;
|
|
+ // put all the local variables right
|
|
+ i = cs[sp].n;
|
|
+ chaininfo = cs[sp].chaininfo;
|
|
+ nentries = chaininfo->nentries;
|
|
+ point = cs[sp].e;
|
|
+ counter_base = cb_base +
|
|
+ chaininfo->counter_offset;
|
|
+ continue;
|
|
+ }
|
|
+ if (verdict == EBT_CONTINUE)
|
|
+ goto letscontinue;
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ if (verdict < 0) {
|
|
+ BUGPRINT("bogus standard verdict\n");
|
|
+ read_unlock_bh(&table->lock);
|
|
+ return NF_DROP;
|
|
+ }
|
|
+#endif
|
|
+ // jump to a udc
|
|
+ cs[sp].n = i + 1;
|
|
+ cs[sp].chaininfo = chaininfo;
|
|
+ cs[sp].e = (struct ebt_entry *)
|
|
+ (((char *)point) + point->next_offset);
|
|
+ i = 0;
|
|
+ chaininfo = (struct ebt_entries *) (base + verdict);
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ if (chaininfo->distinguisher) {
|
|
+ BUGPRINT("jump to non-chain\n");
|
|
+ read_unlock_bh(&table->lock);
|
|
+ return NF_DROP;
|
|
+ }
|
|
+#endif
|
|
+ nentries = chaininfo->nentries;
|
|
+ point = (struct ebt_entry *)chaininfo->data;
|
|
+ counter_base = cb_base + chaininfo->counter_offset;
|
|
+ sp++;
|
|
+ continue;
|
|
+letscontinue:
|
|
+ point = (struct ebt_entry *)
|
|
+ (((char *)point) + point->next_offset);
|
|
+ i++;
|
|
+ }
|
|
+
|
|
+ // I actually like this :)
|
|
+ if (chaininfo->policy == EBT_RETURN)
|
|
+ goto letsreturn;
|
|
+ if (chaininfo->policy == EBT_ACCEPT) {
|
|
+ read_unlock_bh(&table->lock);
|
|
+ return NF_ACCEPT;
|
|
+ }
|
|
+ read_unlock_bh(&table->lock);
|
|
+ return NF_DROP;
|
|
+}
|
|
+
|
|
+// If it succeeds, returns element and locks mutex
|
|
+static inline void *
|
|
+find_inlist_lock_noload(struct list_head *head, const char *name, int *error,
|
|
+ struct semaphore *mutex)
|
|
+{
|
|
+ void *ret;
|
|
+
|
|
+ *error = down_interruptible(mutex);
|
|
+ if (*error != 0)
|
|
+ return NULL;
|
|
+
|
|
+ ret = list_named_find(head, name);
|
|
+ if (!ret) {
|
|
+ *error = -ENOENT;
|
|
+ up(mutex);
|
|
+ }
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+#ifndef CONFIG_KMOD
|
|
+#define find_inlist_lock(h,n,p,e,m) find_inlist_lock_noload((h),(n),(e),(m))
|
|
+#else
|
|
+static void *
|
|
+find_inlist_lock(struct list_head *head, const char *name, const char *prefix,
|
|
+ int *error, struct semaphore *mutex)
|
|
+{
|
|
+ void *ret;
|
|
+
|
|
+ ret = find_inlist_lock_noload(head, name, error, mutex);
|
|
+ if (!ret) {
|
|
+ char modulename[EBT_FUNCTION_MAXNAMELEN + strlen(prefix) + 1];
|
|
+ strcpy(modulename, prefix);
|
|
+ strcat(modulename, name);
|
|
+ request_module(modulename);
|
|
+ ret = find_inlist_lock_noload(head, name, error, mutex);
|
|
+ }
|
|
+ return ret;
|
|
+}
|
|
+#endif
|
|
+
|
|
+static inline struct ebt_table *
|
|
+find_table_lock(const char *name, int *error, struct semaphore *mutex)
|
|
+{
|
|
+ return find_inlist_lock(&ebt_tables, name, "ebtable_", error, mutex);
|
|
+}
|
|
+
|
|
+static inline struct ebt_match *
|
|
+find_match_lock(const char *name, int *error, struct semaphore *mutex)
|
|
+{
|
|
+ return find_inlist_lock(&ebt_matches, name, "ebt_", error, mutex);
|
|
+}
|
|
+
|
|
+static inline struct ebt_watcher *
|
|
+find_watcher_lock(const char *name, int *error, struct semaphore *mutex)
|
|
+{
|
|
+ return find_inlist_lock(&ebt_watchers, name, "ebt_", error, mutex);
|
|
+}
|
|
+
|
|
+static inline struct ebt_target *
|
|
+find_target_lock(const char *name, int *error, struct semaphore *mutex)
|
|
+{
|
|
+ return find_inlist_lock(&ebt_targets, name, "ebt_", error, mutex);
|
|
+}
|
|
+
|
|
+static inline int
|
|
+ebt_check_match(struct ebt_entry_match *m, struct ebt_entry *e,
|
|
+ const char *name, unsigned int hookmask, unsigned int *cnt)
|
|
+{
|
|
+ struct ebt_match *match;
|
|
+ int ret;
|
|
+
|
|
+ if (((char *)m) + m->match_size + sizeof(struct ebt_entry_match) >
|
|
+ ((char *)e) + e->watchers_offset)
|
|
+ return -EINVAL;
|
|
+ match = find_match_lock(m->u.name, &ret, &ebt_mutex);
|
|
+ if (!match)
|
|
+ return ret;
|
|
+ m->u.match = match;
|
|
+ if (match->me)
|
|
+ __MOD_INC_USE_COUNT(match->me);
|
|
+ up(&ebt_mutex);
|
|
+ if (match->check &&
|
|
+ match->check(name, hookmask, e, m->data, m->match_size) != 0) {
|
|
+ BUGPRINT("match->check failed\n");
|
|
+ if (match->me)
|
|
+ __MOD_DEC_USE_COUNT(match->me);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ (*cnt)++;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline int
|
|
+ebt_check_watcher(struct ebt_entry_watcher *w, struct ebt_entry *e,
|
|
+ const char *name, unsigned int hookmask, unsigned int *cnt)
|
|
+{
|
|
+ struct ebt_watcher *watcher;
|
|
+ int ret;
|
|
+
|
|
+ if (((char *)w) + w->watcher_size + sizeof(struct ebt_entry_watcher) >
|
|
+ ((char *)e) + e->target_offset)
|
|
+ return -EINVAL;
|
|
+ watcher = find_watcher_lock(w->u.name, &ret, &ebt_mutex);
|
|
+ if (!watcher)
|
|
+ return ret;
|
|
+ w->u.watcher = watcher;
|
|
+ if (watcher->me)
|
|
+ __MOD_INC_USE_COUNT(watcher->me);
|
|
+ up(&ebt_mutex);
|
|
+ if (watcher->check &&
|
|
+ watcher->check(name, hookmask, e, w->data, w->watcher_size) != 0) {
|
|
+ BUGPRINT("watcher->check failed\n");
|
|
+ if (watcher->me)
|
|
+ __MOD_DEC_USE_COUNT(watcher->me);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ (*cnt)++;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+// this one is very careful, as it is the first function
|
|
+// to parse the userspace data
|
|
+static inline int
|
|
+ebt_check_entry_size_and_hooks(struct ebt_entry *e,
|
|
+ struct ebt_table_info *newinfo, char *base, char *limit,
|
|
+ struct ebt_entries **hook_entries, unsigned int *n, unsigned int *cnt,
|
|
+ unsigned int *totalcnt, unsigned int *udc_cnt, unsigned int valid_hooks)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
|
|
+ if ((valid_hooks & (1 << i)) == 0)
|
|
+ continue;
|
|
+ if ( (char *)hook_entries[i] - base ==
|
|
+ (char *)e - newinfo->entries)
|
|
+ break;
|
|
+ }
|
|
+ // beginning of a new chain
|
|
+ // if i == NF_BR_NUMHOOKS it must be a user defined chain
|
|
+ if (i != NF_BR_NUMHOOKS || !(e->bitmask & EBT_ENTRY_OR_ENTRIES)) {
|
|
+ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) != 0) {
|
|
+ // we make userspace set this right,
|
|
+ // so there is no misunderstanding
|
|
+ BUGPRINT("EBT_ENTRY_OR_ENTRIES shouldn't be set "
|
|
+ "in distinguisher\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ // this checks if the previous chain has as many entries
|
|
+ // as it said it has
|
|
+ if (*n != *cnt) {
|
|
+ BUGPRINT("nentries does not equal the nr of entries "
|
|
+ "in the chain\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ // before we look at the struct, be sure it is not too big
|
|
+ if ((char *)hook_entries[i] + sizeof(struct ebt_entries)
|
|
+ > limit) {
|
|
+ BUGPRINT("entries_size too small\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ if (((struct ebt_entries *)e)->policy != EBT_DROP &&
|
|
+ ((struct ebt_entries *)e)->policy != EBT_ACCEPT) {
|
|
+ // only RETURN from udc
|
|
+ if (i != NF_BR_NUMHOOKS ||
|
|
+ ((struct ebt_entries *)e)->policy != EBT_RETURN) {
|
|
+ BUGPRINT("bad policy\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ }
|
|
+ if (i == NF_BR_NUMHOOKS) // it's a user defined chain
|
|
+ (*udc_cnt)++;
|
|
+ else
|
|
+ newinfo->hook_entry[i] = (struct ebt_entries *)e;
|
|
+ if (((struct ebt_entries *)e)->counter_offset != *totalcnt) {
|
|
+ BUGPRINT("counter_offset != totalcnt");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ *n = ((struct ebt_entries *)e)->nentries;
|
|
+ *cnt = 0;
|
|
+ return 0;
|
|
+ }
|
|
+ // a plain old entry, heh
|
|
+ if (sizeof(struct ebt_entry) > e->watchers_offset ||
|
|
+ e->watchers_offset > e->target_offset ||
|
|
+ e->target_offset >= e->next_offset) {
|
|
+ BUGPRINT("entry offsets not in right order\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ // this is not checked anywhere else
|
|
+ if (e->next_offset - e->target_offset < sizeof(struct ebt_entry_target)) {
|
|
+ BUGPRINT("target size too small\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ (*cnt)++;
|
|
+ (*totalcnt)++;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+struct ebt_cl_stack
|
|
+{
|
|
+ struct ebt_chainstack cs;
|
|
+ int from;
|
|
+ unsigned int hookmask;
|
|
+};
|
|
+
|
|
+// we need these positions to check that the jumps to a different part of the
|
|
+// entries is a jump to the beginning of a new chain.
|
|
+static inline int
|
|
+ebt_get_udc_positions(struct ebt_entry *e, struct ebt_table_info *newinfo,
|
|
+ struct ebt_entries **hook_entries, unsigned int *n, unsigned int valid_hooks,
|
|
+ struct ebt_cl_stack *udc)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ // we're only interested in chain starts
|
|
+ if (e->bitmask & EBT_ENTRY_OR_ENTRIES)
|
|
+ return 0;
|
|
+ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
|
|
+ if ((valid_hooks & (1 << i)) == 0)
|
|
+ continue;
|
|
+ if (newinfo->hook_entry[i] == (struct ebt_entries *)e)
|
|
+ break;
|
|
+ }
|
|
+ // only care about udc
|
|
+ if (i != NF_BR_NUMHOOKS)
|
|
+ return 0;
|
|
+
|
|
+ udc[*n].cs.chaininfo = (struct ebt_entries *)e;
|
|
+ // these initialisations are depended on later in check_chainloops()
|
|
+ udc[*n].cs.n = 0;
|
|
+ udc[*n].hookmask = 0;
|
|
+
|
|
+ (*n)++;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline int
|
|
+ebt_cleanup_match(struct ebt_entry_match *m, unsigned int *i)
|
|
+{
|
|
+ if (i && (*i)-- == 0)
|
|
+ return 1;
|
|
+ if (m->u.match->destroy)
|
|
+ m->u.match->destroy(m->data, m->match_size);
|
|
+ if (m->u.match->me)
|
|
+ __MOD_DEC_USE_COUNT(m->u.match->me);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline int
|
|
+ebt_cleanup_watcher(struct ebt_entry_watcher *w, unsigned int *i)
|
|
+{
|
|
+ if (i && (*i)-- == 0)
|
|
+ return 1;
|
|
+ if (w->u.watcher->destroy)
|
|
+ w->u.watcher->destroy(w->data, w->watcher_size);
|
|
+ if (w->u.watcher->me)
|
|
+ __MOD_DEC_USE_COUNT(w->u.watcher->me);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline int
|
|
+ebt_cleanup_entry(struct ebt_entry *e, unsigned int *cnt)
|
|
+{
|
|
+ struct ebt_entry_target *t;
|
|
+
|
|
+ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
|
|
+ return 0;
|
|
+ // we're done
|
|
+ if (cnt && (*cnt)-- == 0)
|
|
+ return 1;
|
|
+ EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, NULL);
|
|
+ EBT_MATCH_ITERATE(e, ebt_cleanup_match, NULL);
|
|
+ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
|
|
+ if (t->u.target->destroy)
|
|
+ t->u.target->destroy(t->data, t->target_size);
|
|
+ if (t->u.target->me)
|
|
+ __MOD_DEC_USE_COUNT(t->u.target->me);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline int
|
|
+ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
|
|
+ const char *name, unsigned int *cnt, unsigned int valid_hooks,
|
|
+ struct ebt_cl_stack *cl_s, unsigned int udc_cnt)
|
|
+{
|
|
+ struct ebt_entry_target *t;
|
|
+ struct ebt_target *target;
|
|
+ unsigned int i, j, hook = 0, hookmask = 0;
|
|
+ int ret;
|
|
+
|
|
+ // Don't mess with the struct ebt_entries
|
|
+ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
|
|
+ return 0;
|
|
+
|
|
+ if (e->bitmask & ~EBT_F_MASK) {
|
|
+ BUGPRINT("Unknown flag for bitmask\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ if (e->invflags & ~EBT_INV_MASK) {
|
|
+ BUGPRINT("Unknown flag for inv bitmask\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ if ( (e->bitmask & EBT_NOPROTO) && (e->bitmask & EBT_802_3) ) {
|
|
+ BUGPRINT("NOPROTO & 802_3 not allowed\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ // what hook do we belong to?
|
|
+ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
|
|
+ if ((valid_hooks & (1 << i)) == 0)
|
|
+ continue;
|
|
+ if ((char *)newinfo->hook_entry[i] < (char *)e)
|
|
+ hook = i;
|
|
+ else
|
|
+ break;
|
|
+ }
|
|
+ // (1 << NF_BR_NUMHOOKS) tells the check functions the rule is on
|
|
+ // a base chain
|
|
+ if (i < NF_BR_NUMHOOKS)
|
|
+ hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS);
|
|
+ else {
|
|
+ for (i = 0; i < udc_cnt; i++)
|
|
+ if ((char *)(cl_s[i].cs.chaininfo) > (char *)e)
|
|
+ break;
|
|
+ if (i == 0)
|
|
+ hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS);
|
|
+ else
|
|
+ hookmask = cl_s[i - 1].hookmask;
|
|
+ }
|
|
+ i = 0;
|
|
+ ret = EBT_MATCH_ITERATE(e, ebt_check_match, e, name, hookmask, &i);
|
|
+ if (ret != 0)
|
|
+ goto cleanup_matches;
|
|
+ j = 0;
|
|
+ ret = EBT_WATCHER_ITERATE(e, ebt_check_watcher, e, name, hookmask, &j);
|
|
+ if (ret != 0)
|
|
+ goto cleanup_watchers;
|
|
+ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
|
|
+ target = find_target_lock(t->u.name, &ret, &ebt_mutex);
|
|
+ if (!target)
|
|
+ goto cleanup_watchers;
|
|
+ if (target->me)
|
|
+ __MOD_INC_USE_COUNT(target->me);
|
|
+ up(&ebt_mutex);
|
|
+
|
|
+ t->u.target = target;
|
|
+ if (t->u.target == &ebt_standard_target) {
|
|
+ if (e->target_offset + sizeof(struct ebt_standard_target) >
|
|
+ e->next_offset) {
|
|
+ BUGPRINT("Standard target size too big\n");
|
|
+ ret = -EFAULT;
|
|
+ goto cleanup_watchers;
|
|
+ }
|
|
+ if (((struct ebt_standard_target *)t)->verdict <
|
|
+ -NUM_STANDARD_TARGETS) {
|
|
+ BUGPRINT("Invalid standard target\n");
|
|
+ ret = -EFAULT;
|
|
+ goto cleanup_watchers;
|
|
+ }
|
|
+ } else if ((e->target_offset + t->target_size +
|
|
+ sizeof(struct ebt_entry_target) > e->next_offset) ||
|
|
+ (t->u.target->check &&
|
|
+ t->u.target->check(name, hookmask, e, t->data, t->target_size) != 0)){
|
|
+ if (t->u.target->me)
|
|
+ __MOD_DEC_USE_COUNT(t->u.target->me);
|
|
+ ret = -EFAULT;
|
|
+ goto cleanup_watchers;
|
|
+ }
|
|
+ (*cnt)++;
|
|
+ return 0;
|
|
+cleanup_watchers:
|
|
+ EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, &j);
|
|
+cleanup_matches:
|
|
+ EBT_MATCH_ITERATE(e, ebt_cleanup_match, &i);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+// checks for loops and sets the hook mask for udc
|
|
+// the hook mask for udc tells us from which base chains the udc can be
|
|
+// accessed. This mask is a parameter to the check() functions of the extensions
|
|
+static int check_chainloops(struct ebt_entries *chain,
|
|
+ struct ebt_cl_stack *cl_s, unsigned int udc_cnt,
|
|
+ unsigned int hooknr, char *base)
|
|
+{
|
|
+ int i, chain_nr = -1, pos = 0, nentries = chain->nentries, verdict;
|
|
+ struct ebt_entry *e = (struct ebt_entry *)chain->data;
|
|
+ struct ebt_entry_target *t;
|
|
+
|
|
+ while (pos < nentries || chain_nr != -1) {
|
|
+ // end of udc, go back one 'recursion' step
|
|
+ if (pos == nentries) {
|
|
+ // put back values of the time when this chain was called
|
|
+ e = cl_s[chain_nr].cs.e;
|
|
+ if (cl_s[chain_nr].from != -1)
|
|
+ nentries =
|
|
+ cl_s[cl_s[chain_nr].from].cs.chaininfo->nentries;
|
|
+ else
|
|
+ nentries = chain->nentries;
|
|
+ pos = cl_s[chain_nr].cs.n;
|
|
+ // make sure we won't see a loop that isn't one
|
|
+ cl_s[chain_nr].cs.n = 0;
|
|
+ chain_nr = cl_s[chain_nr].from;
|
|
+ if (pos == nentries)
|
|
+ continue;
|
|
+ }
|
|
+ t = (struct ebt_entry_target *)
|
|
+ (((char *)e) + e->target_offset);
|
|
+ if (strcmp(t->u.name, EBT_STANDARD_TARGET))
|
|
+ goto letscontinue;
|
|
+ if (e->target_offset + sizeof(struct ebt_standard_target) >
|
|
+ e->next_offset) {
|
|
+ BUGPRINT("Standard target size too big\n");
|
|
+ return -1;
|
|
+ }
|
|
+ verdict = ((struct ebt_standard_target *)t)->verdict;
|
|
+ if (verdict >= 0) { // jump to another chain
|
|
+ struct ebt_entries *hlp2 =
|
|
+ (struct ebt_entries *)(base + verdict);
|
|
+ for (i = 0; i < udc_cnt; i++)
|
|
+ if (hlp2 == cl_s[i].cs.chaininfo)
|
|
+ break;
|
|
+ // bad destination or loop
|
|
+ if (i == udc_cnt) {
|
|
+ BUGPRINT("bad destination\n");
|
|
+ return -1;
|
|
+ }
|
|
+ if (cl_s[i].cs.n) {
|
|
+ BUGPRINT("loop\n");
|
|
+ return -1;
|
|
+ }
|
|
+ // this can't be 0, so the above test is correct
|
|
+ cl_s[i].cs.n = pos + 1;
|
|
+ pos = 0;
|
|
+ cl_s[i].cs.e = ((void *)e + e->next_offset);
|
|
+ e = (struct ebt_entry *)(hlp2->data);
|
|
+ nentries = hlp2->nentries;
|
|
+ cl_s[i].from = chain_nr;
|
|
+ chain_nr = i;
|
|
+ // this udc is accessible from the base chain for hooknr
|
|
+ cl_s[i].hookmask |= (1 << hooknr);
|
|
+ continue;
|
|
+ }
|
|
+letscontinue:
|
|
+ e = (void *)e + e->next_offset;
|
|
+ pos++;
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+// do the parsing of the table/chains/entries/matches/watchers/targets, heh
|
|
+static int translate_table(struct ebt_replace *repl,
|
|
+ struct ebt_table_info *newinfo)
|
|
+{
|
|
+ unsigned int i, j, k, udc_cnt;
|
|
+ int ret;
|
|
+ struct ebt_cl_stack *cl_s = NULL; // used in the checking for chain loops
|
|
+
|
|
+ i = 0;
|
|
+ while (i < NF_BR_NUMHOOKS && !(repl->valid_hooks & (1 << i)))
|
|
+ i++;
|
|
+ if (i == NF_BR_NUMHOOKS) {
|
|
+ BUGPRINT("No valid hooks specified\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ if (repl->hook_entry[i] != (struct ebt_entries *)repl->entries) {
|
|
+ BUGPRINT("Chains don't start at beginning\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ // make sure chains are ordered after each other in same order
|
|
+ // as their corresponding hooks
|
|
+ for (j = i + 1; j < NF_BR_NUMHOOKS; j++) {
|
|
+ if (!(repl->valid_hooks & (1 << j)))
|
|
+ continue;
|
|
+ if ( repl->hook_entry[j] <= repl->hook_entry[i] ) {
|
|
+ BUGPRINT("Hook order must be followed\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ i = j;
|
|
+ }
|
|
+
|
|
+ for (i = 0; i < NF_BR_NUMHOOKS; i++)
|
|
+ newinfo->hook_entry[i] = NULL;
|
|
+
|
|
+ newinfo->entries_size = repl->entries_size;
|
|
+ newinfo->nentries = repl->nentries;
|
|
+
|
|
+ // do some early checkings and initialize some things
|
|
+ i = 0; // holds the expected nr. of entries for the chain
|
|
+ j = 0; // holds the up to now counted entries for the chain
|
|
+ k = 0; // holds the total nr. of entries, should equal
|
|
+ // newinfo->nentries afterwards
|
|
+ udc_cnt = 0; // will hold the nr. of user defined chains (udc)
|
|
+ ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
|
|
+ ebt_check_entry_size_and_hooks, newinfo, repl->entries,
|
|
+ repl->entries + repl->entries_size, repl->hook_entry, &i, &j, &k,
|
|
+ &udc_cnt, repl->valid_hooks);
|
|
+
|
|
+ if (ret != 0)
|
|
+ return ret;
|
|
+
|
|
+ if (i != j) {
|
|
+ BUGPRINT("nentries does not equal the nr of entries in the "
|
|
+ "(last) chain\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ if (k != newinfo->nentries) {
|
|
+ BUGPRINT("Total nentries is wrong\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ // check if all valid hooks have a chain
|
|
+ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
|
|
+ if (newinfo->hook_entry[i] == NULL &&
|
|
+ (repl->valid_hooks & (1 << i))) {
|
|
+ BUGPRINT("Valid hook without chain\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ // Get the location of the udc, put them in an array
|
|
+ // While we're at it, allocate the chainstack
|
|
+ if (udc_cnt) {
|
|
+ // this will get free'd in do_replace()/ebt_register_table()
|
|
+ // if an error occurs
|
|
+ newinfo->chainstack = (struct ebt_chainstack **)
|
|
+ vmalloc(smp_num_cpus * sizeof(struct ebt_chainstack));
|
|
+ if (!newinfo->chainstack)
|
|
+ return -ENOMEM;
|
|
+ for (i = 0; i < smp_num_cpus; i++) {
|
|
+ newinfo->chainstack[i] =
|
|
+ vmalloc(udc_cnt * sizeof(struct ebt_chainstack));
|
|
+ if (!newinfo->chainstack[i]) {
|
|
+ while (i)
|
|
+ vfree(newinfo->chainstack[--i]);
|
|
+ vfree(newinfo->chainstack);
|
|
+ newinfo->chainstack = NULL;
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ cl_s = (struct ebt_cl_stack *)
|
|
+ vmalloc(udc_cnt * sizeof(struct ebt_cl_stack));
|
|
+ if (!cl_s)
|
|
+ return -ENOMEM;
|
|
+ i = 0; // the i'th udc
|
|
+ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
|
|
+ ebt_get_udc_positions, newinfo, repl->hook_entry, &i,
|
|
+ repl->valid_hooks, cl_s);
|
|
+ // sanity check
|
|
+ if (i != udc_cnt) {
|
|
+ BUGPRINT("i != udc_cnt\n");
|
|
+ vfree(cl_s);
|
|
+ return -EFAULT;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ // Check for loops
|
|
+ for (i = 0; i < NF_BR_NUMHOOKS; i++)
|
|
+ if (repl->valid_hooks & (1 << i))
|
|
+ if (check_chainloops(newinfo->hook_entry[i],
|
|
+ cl_s, udc_cnt, i, newinfo->entries)) {
|
|
+ if (cl_s)
|
|
+ vfree(cl_s);
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ // we now know the following (along with E=mc):
|
|
+ // - the nr of entries in each chain is right
|
|
+ // - the size of the allocated space is right
|
|
+ // - all valid hooks have a corresponding chain
|
|
+ // - there are no loops
|
|
+ // - wrong data can still be on the level of a single entry
|
|
+ // - could be there are jumps to places that are not the
|
|
+ // beginning of a chain. This can only occur in chains that
|
|
+ // are not accessible from any base chains, so we don't care.
|
|
+
|
|
+ // used to know what we need to clean up if something goes wrong
|
|
+ i = 0;
|
|
+ ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
|
|
+ ebt_check_entry, newinfo, repl->name, &i, repl->valid_hooks,
|
|
+ cl_s, udc_cnt);
|
|
+ if (ret != 0) {
|
|
+ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
|
|
+ ebt_cleanup_entry, &i);
|
|
+ }
|
|
+ if (cl_s)
|
|
+ vfree(cl_s);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+// called under write_lock
|
|
+static void get_counters(struct ebt_counter *oldcounters,
|
|
+ struct ebt_counter *counters, unsigned int nentries)
|
|
+{
|
|
+ int i, cpu;
|
|
+ struct ebt_counter *counter_base;
|
|
+
|
|
+ // counters of cpu 0
|
|
+ memcpy(counters, oldcounters,
|
|
+ sizeof(struct ebt_counter) * nentries);
|
|
+ // add other counters to those of cpu 0
|
|
+ for (cpu = 1; cpu < smp_num_cpus; cpu++) {
|
|
+ counter_base = COUNTER_BASE(oldcounters, nentries, cpu);
|
|
+ for (i = 0; i < nentries; i++) {
|
|
+ counters[i].pcnt += counter_base[i].pcnt;
|
|
+ counters[i].bcnt += counter_base[i].bcnt;
|
|
+ }
|
|
+ }
|
|
+}
|
|
+
|
|
+// replace the table
|
|
+static int do_replace(void *user, unsigned int len)
|
|
+{
|
|
+ int ret, i, countersize;
|
|
+ struct ebt_table_info *newinfo;
|
|
+ struct ebt_replace tmp;
|
|
+ struct ebt_table *t;
|
|
+ struct ebt_counter *counterstmp = NULL;
|
|
+ // used to be able to unlock earlier
|
|
+ struct ebt_table_info *table;
|
|
+
|
|
+ if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
|
|
+ return -EFAULT;
|
|
+
|
|
+ if (len != sizeof(tmp) + tmp.entries_size) {
|
|
+ BUGPRINT("Wrong len argument\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ if (tmp.entries_size == 0) {
|
|
+ BUGPRINT("Entries_size never zero\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ countersize = COUNTER_OFFSET(tmp.nentries) * smp_num_cpus;
|
|
+ newinfo = (struct ebt_table_info *)
|
|
+ vmalloc(sizeof(struct ebt_table_info) + countersize);
|
|
+ if (!newinfo)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ if (countersize)
|
|
+ memset(newinfo->counters, 0, countersize);
|
|
+
|
|
+ newinfo->entries = (char *)vmalloc(tmp.entries_size);
|
|
+ if (!newinfo->entries) {
|
|
+ ret = -ENOMEM;
|
|
+ goto free_newinfo;
|
|
+ }
|
|
+ if (copy_from_user(
|
|
+ newinfo->entries, tmp.entries, tmp.entries_size) != 0) {
|
|
+ BUGPRINT("Couldn't copy entries from userspace\n");
|
|
+ ret = -EFAULT;
|
|
+ goto free_entries;
|
|
+ }
|
|
+
|
|
+ // the user wants counters back
|
|
+ // the check on the size is done later, when we have the lock
|
|
+ if (tmp.num_counters) {
|
|
+ counterstmp = (struct ebt_counter *)
|
|
+ vmalloc(tmp.num_counters * sizeof(struct ebt_counter));
|
|
+ if (!counterstmp) {
|
|
+ ret = -ENOMEM;
|
|
+ goto free_entries;
|
|
+ }
|
|
+ }
|
|
+ else
|
|
+ counterstmp = NULL;
|
|
+
|
|
+ // this can get initialized by translate_table()
|
|
+ newinfo->chainstack = NULL;
|
|
+ ret = translate_table(&tmp, newinfo);
|
|
+
|
|
+ if (ret != 0)
|
|
+ goto free_counterstmp;
|
|
+
|
|
+ t = find_table_lock(tmp.name, &ret, &ebt_mutex);
|
|
+ if (!t)
|
|
+ goto free_iterate;
|
|
+
|
|
+ // the table doesn't like it
|
|
+ if (t->check && (ret = t->check(newinfo, tmp.valid_hooks)))
|
|
+ goto free_unlock;
|
|
+
|
|
+ if (tmp.num_counters && tmp.num_counters != t->private->nentries) {
|
|
+ BUGPRINT("Wrong nr. of counters requested\n");
|
|
+ ret = -EINVAL;
|
|
+ goto free_unlock;
|
|
+ }
|
|
+
|
|
+ // we have the mutex lock, so no danger in reading this pointer
|
|
+ table = t->private;
|
|
+ // we need an atomic snapshot of the counters
|
|
+ write_lock_bh(&t->lock);
|
|
+ if (tmp.num_counters)
|
|
+ get_counters(t->private->counters, counterstmp,
|
|
+ t->private->nentries);
|
|
+
|
|
+ t->private = newinfo;
|
|
+ write_unlock_bh(&t->lock);
|
|
+ up(&ebt_mutex);
|
|
+ // So, a user can change the chains while having messed up her counter
|
|
+ // allocation. Only reason why this is done is because this way the lock
|
|
+ // is held only once, while this doesn't bring the kernel into a
|
|
+ // dangerous state.
|
|
+ if (tmp.num_counters &&
|
|
+ copy_to_user(tmp.counters, counterstmp,
|
|
+ tmp.num_counters * sizeof(struct ebt_counter))) {
|
|
+ BUGPRINT("Couldn't copy counters to userspace\n");
|
|
+ ret = -EFAULT;
|
|
+ }
|
|
+ else
|
|
+ ret = 0;
|
|
+
|
|
+ // decrease module count and free resources
|
|
+ EBT_ENTRY_ITERATE(table->entries, table->entries_size,
|
|
+ ebt_cleanup_entry, NULL);
|
|
+
|
|
+ vfree(table->entries);
|
|
+ if (table->chainstack) {
|
|
+ for (i = 0; i < smp_num_cpus; i++)
|
|
+ vfree(table->chainstack[i]);
|
|
+ vfree(table->chainstack);
|
|
+ }
|
|
+ vfree(table);
|
|
+
|
|
+ if (counterstmp)
|
|
+ vfree(counterstmp);
|
|
+ return ret;
|
|
+
|
|
+free_unlock:
|
|
+ up(&ebt_mutex);
|
|
+free_iterate:
|
|
+ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
|
|
+ ebt_cleanup_entry, NULL);
|
|
+free_counterstmp:
|
|
+ if (counterstmp)
|
|
+ vfree(counterstmp);
|
|
+ // can be initialized in translate_table()
|
|
+ if (newinfo->chainstack) {
|
|
+ for (i = 0; i < smp_num_cpus; i++)
|
|
+ vfree(newinfo->chainstack[i]);
|
|
+ vfree(newinfo->chainstack);
|
|
+ }
|
|
+free_entries:
|
|
+ if (newinfo->entries)
|
|
+ vfree(newinfo->entries);
|
|
+free_newinfo:
|
|
+ if (newinfo)
|
|
+ vfree(newinfo);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+int ebt_register_target(struct ebt_target *target)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ ret = down_interruptible(&ebt_mutex);
|
|
+ if (ret != 0)
|
|
+ return ret;
|
|
+ if (!list_named_insert(&ebt_targets, target)) {
|
|
+ up(&ebt_mutex);
|
|
+ return -EEXIST;
|
|
+ }
|
|
+ up(&ebt_mutex);
|
|
+ MOD_INC_USE_COUNT;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+void ebt_unregister_target(struct ebt_target *target)
|
|
+{
|
|
+ down(&ebt_mutex);
|
|
+ LIST_DELETE(&ebt_targets, target);
|
|
+ up(&ebt_mutex);
|
|
+ MOD_DEC_USE_COUNT;
|
|
+}
|
|
+
|
|
+int ebt_register_match(struct ebt_match *match)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ ret = down_interruptible(&ebt_mutex);
|
|
+ if (ret != 0)
|
|
+ return ret;
|
|
+ if (!list_named_insert(&ebt_matches, match)) {
|
|
+ up(&ebt_mutex);
|
|
+ return -EEXIST;
|
|
+ }
|
|
+ up(&ebt_mutex);
|
|
+ MOD_INC_USE_COUNT;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+void ebt_unregister_match(struct ebt_match *match)
|
|
+{
|
|
+ down(&ebt_mutex);
|
|
+ LIST_DELETE(&ebt_matches, match);
|
|
+ up(&ebt_mutex);
|
|
+ MOD_DEC_USE_COUNT;
|
|
+}
|
|
+
|
|
+int ebt_register_watcher(struct ebt_watcher *watcher)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ ret = down_interruptible(&ebt_mutex);
|
|
+ if (ret != 0)
|
|
+ return ret;
|
|
+ if (!list_named_insert(&ebt_watchers, watcher)) {
|
|
+ up(&ebt_mutex);
|
|
+ return -EEXIST;
|
|
+ }
|
|
+ up(&ebt_mutex);
|
|
+ MOD_INC_USE_COUNT;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+void ebt_unregister_watcher(struct ebt_watcher *watcher)
|
|
+{
|
|
+ down(&ebt_mutex);
|
|
+ LIST_DELETE(&ebt_watchers, watcher);
|
|
+ up(&ebt_mutex);
|
|
+ MOD_DEC_USE_COUNT;
|
|
+}
|
|
+
|
|
+int ebt_register_table(struct ebt_table *table)
|
|
+{
|
|
+ struct ebt_table_info *newinfo;
|
|
+ int ret, i, countersize;
|
|
+
|
|
+ if (!table || !table->table ||!table->table->entries ||
|
|
+ table->table->entries_size == 0 ||
|
|
+ table->table->counters || table->private) {
|
|
+ BUGPRINT("Bad table data for ebt_register_table!!!\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ countersize = COUNTER_OFFSET(table->table->nentries) * smp_num_cpus;
|
|
+ newinfo = (struct ebt_table_info *)
|
|
+ vmalloc(sizeof(struct ebt_table_info) + countersize);
|
|
+ ret = -ENOMEM;
|
|
+ if (!newinfo)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ newinfo->entries = (char *)vmalloc(table->table->entries_size);
|
|
+ if (!(newinfo->entries))
|
|
+ goto free_newinfo;
|
|
+
|
|
+ memcpy(newinfo->entries, table->table->entries,
|
|
+ table->table->entries_size);
|
|
+
|
|
+ if (countersize)
|
|
+ memset(newinfo->counters, 0, countersize);
|
|
+
|
|
+ // fill in newinfo and parse the entries
|
|
+ newinfo->chainstack = NULL;
|
|
+ ret = translate_table(table->table, newinfo);
|
|
+ if (ret != 0) {
|
|
+ BUGPRINT("Translate_table failed\n");
|
|
+ goto free_chainstack;
|
|
+ }
|
|
+
|
|
+ if (table->check && table->check(newinfo, table->valid_hooks)) {
|
|
+ BUGPRINT("The table doesn't like its own initial data, lol\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ table->private = newinfo;
|
|
+ table->lock = RW_LOCK_UNLOCKED;
|
|
+ ret = down_interruptible(&ebt_mutex);
|
|
+ if (ret != 0)
|
|
+ goto free_chainstack;
|
|
+
|
|
+ if (list_named_find(&ebt_tables, table->name)) {
|
|
+ ret = -EEXIST;
|
|
+ BUGPRINT("Table name already exists\n");
|
|
+ goto free_unlock;
|
|
+ }
|
|
+
|
|
+ list_prepend(&ebt_tables, table);
|
|
+ up(&ebt_mutex);
|
|
+ MOD_INC_USE_COUNT;
|
|
+ return 0;
|
|
+free_unlock:
|
|
+ up(&ebt_mutex);
|
|
+free_chainstack:
|
|
+ if (newinfo->chainstack) {
|
|
+ for (i = 0; i < smp_num_cpus; i++)
|
|
+ vfree(newinfo->chainstack[i]);
|
|
+ vfree(newinfo->chainstack);
|
|
+ }
|
|
+ vfree(newinfo->entries);
|
|
+free_newinfo:
|
|
+ vfree(newinfo);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+void ebt_unregister_table(struct ebt_table *table)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ if (!table) {
|
|
+ BUGPRINT("Request to unregister NULL table!!!\n");
|
|
+ return;
|
|
+ }
|
|
+ down(&ebt_mutex);
|
|
+ LIST_DELETE(&ebt_tables, table);
|
|
+ up(&ebt_mutex);
|
|
+ EBT_ENTRY_ITERATE(table->private->entries,
|
|
+ table->private->entries_size, ebt_cleanup_entry, NULL);
|
|
+ if (table->private->entries)
|
|
+ vfree(table->private->entries);
|
|
+ if (table->private->chainstack) {
|
|
+ for (i = 0; i < smp_num_cpus; i++)
|
|
+ vfree(table->private->chainstack[i]);
|
|
+ vfree(table->private->chainstack);
|
|
+ }
|
|
+ vfree(table->private);
|
|
+ MOD_DEC_USE_COUNT;
|
|
+}
|
|
+
|
|
+// userspace just supplied us with counters
|
|
+static int update_counters(void *user, unsigned int len)
|
|
+{
|
|
+ int i, ret;
|
|
+ struct ebt_counter *tmp;
|
|
+ struct ebt_replace hlp;
|
|
+ struct ebt_table *t;
|
|
+
|
|
+ if (copy_from_user(&hlp, user, sizeof(hlp)))
|
|
+ return -EFAULT;
|
|
+
|
|
+ if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))
|
|
+ return -EINVAL;
|
|
+ if (hlp.num_counters == 0)
|
|
+ return -EINVAL;
|
|
+
|
|
+ if ( !(tmp = (struct ebt_counter *)
|
|
+ vmalloc(hlp.num_counters * sizeof(struct ebt_counter))) ){
|
|
+ MEMPRINT("Update_counters && nomemory\n");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ t = find_table_lock(hlp.name, &ret, &ebt_mutex);
|
|
+ if (!t)
|
|
+ goto free_tmp;
|
|
+
|
|
+ if (hlp.num_counters != t->private->nentries) {
|
|
+ BUGPRINT("Wrong nr of counters\n");
|
|
+ ret = -EINVAL;
|
|
+ goto unlock_mutex;
|
|
+ }
|
|
+
|
|
+ if ( copy_from_user(tmp, hlp.counters,
|
|
+ hlp.num_counters * sizeof(struct ebt_counter)) ) {
|
|
+ BUGPRINT("Updata_counters && !cfu\n");
|
|
+ ret = -EFAULT;
|
|
+ goto unlock_mutex;
|
|
+ }
|
|
+
|
|
+ // we want an atomic add of the counters
|
|
+ write_lock_bh(&t->lock);
|
|
+
|
|
+ // we add to the counters of the first cpu
|
|
+ for (i = 0; i < hlp.num_counters; i++) {
|
|
+ t->private->counters[i].pcnt += tmp[i].pcnt;
|
|
+ t->private->counters[i].bcnt += tmp[i].bcnt;
|
|
+ }
|
|
+
|
|
+ write_unlock_bh(&t->lock);
|
|
+ ret = 0;
|
|
+unlock_mutex:
|
|
+ up(&ebt_mutex);
|
|
+free_tmp:
|
|
+ vfree(tmp);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static inline int ebt_make_matchname(struct ebt_entry_match *m,
|
|
+ char *base, char *ubase)
|
|
+{
|
|
+ char *hlp = ubase - base + (char *)m;
|
|
+ if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN))
|
|
+ return -EFAULT;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline int ebt_make_watchername(struct ebt_entry_watcher *w,
|
|
+ char *base, char *ubase)
|
|
+{
|
|
+ char *hlp = ubase - base + (char *)w;
|
|
+ if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN))
|
|
+ return -EFAULT;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline int ebt_make_names(struct ebt_entry *e, char *base, char *ubase)
|
|
+{
|
|
+ int ret;
|
|
+ char *hlp;
|
|
+ struct ebt_entry_target *t;
|
|
+
|
|
+ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
|
|
+ return 0;
|
|
+
|
|
+ hlp = ubase - base + (char *)e + e->target_offset;
|
|
+ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
|
|
+
|
|
+ ret = EBT_MATCH_ITERATE(e, ebt_make_matchname, base, ubase);
|
|
+ if (ret != 0)
|
|
+ return ret;
|
|
+ ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase);
|
|
+ if (ret != 0)
|
|
+ return ret;
|
|
+ if (copy_to_user(hlp, t->u.target->name, EBT_FUNCTION_MAXNAMELEN))
|
|
+ return -EFAULT;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+// called with ebt_mutex down
|
|
+static int copy_everything_to_user(struct ebt_table *t, void *user,
|
|
+ int *len, int cmd)
|
|
+{
|
|
+ struct ebt_replace tmp;
|
|
+ struct ebt_counter *counterstmp, *oldcounters;
|
|
+ unsigned int entries_size, nentries;
|
|
+ char *entries;
|
|
+
|
|
+ if (cmd == EBT_SO_GET_ENTRIES) {
|
|
+ entries_size = t->private->entries_size;
|
|
+ nentries = t->private->nentries;
|
|
+ entries = t->private->entries;
|
|
+ oldcounters = t->private->counters;
|
|
+ } else {
|
|
+ entries_size = t->table->entries_size;
|
|
+ nentries = t->table->nentries;
|
|
+ entries = t->table->entries;
|
|
+ oldcounters = t->table->counters;
|
|
+ }
|
|
+
|
|
+ if (copy_from_user(&tmp, user, sizeof(tmp))) {
|
|
+ BUGPRINT("Cfu didn't work\n");
|
|
+ return -EFAULT;
|
|
+ }
|
|
+
|
|
+ if (*len != sizeof(struct ebt_replace) + entries_size +
|
|
+ (tmp.num_counters? nentries * sizeof(struct ebt_counter): 0)) {
|
|
+ BUGPRINT("Wrong size\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ if (tmp.nentries != nentries) {
|
|
+ BUGPRINT("Nentries wrong\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ if (tmp.entries_size != entries_size) {
|
|
+ BUGPRINT("Wrong size\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ // userspace might not need the counters
|
|
+ if (tmp.num_counters) {
|
|
+ if (tmp.num_counters != nentries) {
|
|
+ BUGPRINT("Num_counters wrong\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+ counterstmp = (struct ebt_counter *)
|
|
+ vmalloc(nentries * sizeof(struct ebt_counter));
|
|
+ if (!counterstmp) {
|
|
+ MEMPRINT("Couldn't copy counters, out of memory\n");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+ write_lock_bh(&t->lock);
|
|
+ get_counters(oldcounters, counterstmp, nentries);
|
|
+ write_unlock_bh(&t->lock);
|
|
+
|
|
+ if (copy_to_user(tmp.counters, counterstmp,
|
|
+ nentries * sizeof(struct ebt_counter))) {
|
|
+ BUGPRINT("Couldn't copy counters to userspace\n");
|
|
+ vfree(counterstmp);
|
|
+ return -EFAULT;
|
|
+ }
|
|
+ vfree(counterstmp);
|
|
+ }
|
|
+
|
|
+ if (copy_to_user(tmp.entries, entries, entries_size)) {
|
|
+ BUGPRINT("Couldn't copy entries to userspace\n");
|
|
+ return -EFAULT;
|
|
+ }
|
|
+ // set the match/watcher/target names right
|
|
+ return EBT_ENTRY_ITERATE(entries, entries_size,
|
|
+ ebt_make_names, entries, tmp.entries);
|
|
+}
|
|
+
|
|
+static int do_ebt_set_ctl(struct sock *sk,
|
|
+ int cmd, void *user, unsigned int len)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ switch(cmd) {
|
|
+ case EBT_SO_SET_ENTRIES:
|
|
+ ret = do_replace(user, len);
|
|
+ break;
|
|
+ case EBT_SO_SET_COUNTERS:
|
|
+ ret = update_counters(user, len);
|
|
+ break;
|
|
+ default:
|
|
+ ret = -EINVAL;
|
|
+ }
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int do_ebt_get_ctl(struct sock *sk, int cmd, void *user, int *len)
|
|
+{
|
|
+ int ret;
|
|
+ struct ebt_replace tmp;
|
|
+ struct ebt_table *t;
|
|
+
|
|
+ if (copy_from_user(&tmp, user, sizeof(tmp)))
|
|
+ return -EFAULT;
|
|
+
|
|
+ t = find_table_lock(tmp.name, &ret, &ebt_mutex);
|
|
+ if (!t)
|
|
+ return ret;
|
|
+
|
|
+ switch(cmd) {
|
|
+ case EBT_SO_GET_INFO:
|
|
+ case EBT_SO_GET_INIT_INFO:
|
|
+ if (*len != sizeof(struct ebt_replace)){
|
|
+ ret = -EINVAL;
|
|
+ up(&ebt_mutex);
|
|
+ break;
|
|
+ }
|
|
+ if (cmd == EBT_SO_GET_INFO) {
|
|
+ tmp.nentries = t->private->nentries;
|
|
+ tmp.entries_size = t->private->entries_size;
|
|
+ tmp.valid_hooks = t->valid_hooks;
|
|
+ } else {
|
|
+ tmp.nentries = t->table->nentries;
|
|
+ tmp.entries_size = t->table->entries_size;
|
|
+ tmp.valid_hooks = t->table->valid_hooks;
|
|
+ }
|
|
+ up(&ebt_mutex);
|
|
+ if (copy_to_user(user, &tmp, *len) != 0){
|
|
+ BUGPRINT("c2u Didn't work\n");
|
|
+ ret = -EFAULT;
|
|
+ break;
|
|
+ }
|
|
+ ret = 0;
|
|
+ break;
|
|
+
|
|
+ case EBT_SO_GET_ENTRIES:
|
|
+ case EBT_SO_GET_INIT_ENTRIES:
|
|
+ ret = copy_everything_to_user(t, user, len, cmd);
|
|
+ up(&ebt_mutex);
|
|
+ break;
|
|
+
|
|
+ default:
|
|
+ up(&ebt_mutex);
|
|
+ ret = -EINVAL;
|
|
+ }
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static struct nf_sockopt_ops ebt_sockopts =
|
|
+{ { NULL, NULL }, PF_INET, EBT_BASE_CTL, EBT_SO_SET_MAX + 1, do_ebt_set_ctl,
|
|
+ EBT_BASE_CTL, EBT_SO_GET_MAX + 1, do_ebt_get_ctl, 0, NULL
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ down(&ebt_mutex);
|
|
+ list_named_insert(&ebt_targets, &ebt_standard_target);
|
|
+ up(&ebt_mutex);
|
|
+ if ((ret = nf_register_sockopt(&ebt_sockopts)) < 0)
|
|
+ return ret;
|
|
+
|
|
+ printk(KERN_NOTICE "Ebtables v2.0 registered\n");
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ nf_unregister_sockopt(&ebt_sockopts);
|
|
+ printk(KERN_NOTICE "Ebtables v2.0 unregistered\n");
|
|
+}
|
|
+
|
|
+EXPORT_SYMBOL(ebt_register_table);
|
|
+EXPORT_SYMBOL(ebt_unregister_table);
|
|
+EXPORT_SYMBOL(ebt_register_match);
|
|
+EXPORT_SYMBOL(ebt_unregister_match);
|
|
+EXPORT_SYMBOL(ebt_register_watcher);
|
|
+EXPORT_SYMBOL(ebt_unregister_watcher);
|
|
+EXPORT_SYMBOL(ebt_register_target);
|
|
+EXPORT_SYMBOL(ebt_unregister_target);
|
|
+EXPORT_SYMBOL(ebt_do_table);
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebtables.h 2005-03-14 21:24:12.000000000 +0100
|
|
@@ -0,0 +1,361 @@
|
|
+/*
|
|
+ * ebtables
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * ebtables.c,v 2.0, September, 2002
|
|
+ *
|
|
+ * This code is stongly inspired on the iptables code which is
|
|
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
|
|
+ */
|
|
+
|
|
+#ifndef __LINUX_BRIDGE_EFF_H
|
|
+#define __LINUX_BRIDGE_EFF_H
|
|
+#include <linux/if.h>
|
|
+#include <linux/netfilter_bridge.h>
|
|
+#include <linux/if_ether.h>
|
|
+
|
|
+#define EBT_TABLE_MAXNAMELEN 32
|
|
+#define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
|
|
+#define EBT_FUNCTION_MAXNAMELEN EBT_TABLE_MAXNAMELEN
|
|
+
|
|
+// verdicts >0 are "branches"
|
|
+#define EBT_ACCEPT -1
|
|
+#define EBT_DROP -2
|
|
+#define EBT_CONTINUE -3
|
|
+#define EBT_RETURN -4
|
|
+#define NUM_STANDARD_TARGETS 4
|
|
+
|
|
+struct ebt_counter
|
|
+{
|
|
+ uint64_t pcnt;
|
|
+ uint64_t bcnt;
|
|
+};
|
|
+
|
|
+struct ebt_entries {
|
|
+ // this field is always set to zero
|
|
+ // See EBT_ENTRY_OR_ENTRIES.
|
|
+ // Must be same size as ebt_entry.bitmask
|
|
+ unsigned int distinguisher;
|
|
+ // the chain name
|
|
+ char name[EBT_CHAIN_MAXNAMELEN];
|
|
+ // counter offset for this chain
|
|
+ unsigned int counter_offset;
|
|
+ // one standard (accept, drop, return) per hook
|
|
+ int policy;
|
|
+ // nr. of entries
|
|
+ unsigned int nentries;
|
|
+ // entry list
|
|
+ char data[0];
|
|
+};
|
|
+
|
|
+// used for the bitmask of struct ebt_entry
|
|
+
|
|
+// This is a hack to make a difference between an ebt_entry struct and an
|
|
+// ebt_entries struct when traversing the entries from start to end.
|
|
+// Using this simplifies the code alot, while still being able to use
|
|
+// ebt_entries.
|
|
+// Contrary, iptables doesn't use something like ebt_entries and therefore uses
|
|
+// different techniques for naming the policy and such. So, iptables doesn't
|
|
+// need a hack like this.
|
|
+#define EBT_ENTRY_OR_ENTRIES 0x01
|
|
+// these are the normal masks
|
|
+#define EBT_NOPROTO 0x02
|
|
+#define EBT_802_3 0x04
|
|
+#define EBT_SOURCEMAC 0x08
|
|
+#define EBT_DESTMAC 0x10
|
|
+#define EBT_F_MASK (EBT_NOPROTO | EBT_802_3 | EBT_SOURCEMAC | EBT_DESTMAC \
|
|
+ | EBT_ENTRY_OR_ENTRIES)
|
|
+
|
|
+#define EBT_IPROTO 0x01
|
|
+#define EBT_IIN 0x02
|
|
+#define EBT_IOUT 0x04
|
|
+#define EBT_ISOURCE 0x8
|
|
+#define EBT_IDEST 0x10
|
|
+#define EBT_ILOGICALIN 0x20
|
|
+#define EBT_ILOGICALOUT 0x40
|
|
+#define EBT_INV_MASK (EBT_IPROTO | EBT_IIN | EBT_IOUT | EBT_ILOGICALIN \
|
|
+ | EBT_ILOGICALOUT | EBT_ISOURCE | EBT_IDEST)
|
|
+
|
|
+struct ebt_entry_match
|
|
+{
|
|
+ union {
|
|
+ char name[EBT_FUNCTION_MAXNAMELEN];
|
|
+ struct ebt_match *match;
|
|
+ } u;
|
|
+ // size of data
|
|
+ unsigned int match_size;
|
|
+ unsigned char data[0];
|
|
+};
|
|
+
|
|
+struct ebt_entry_watcher
|
|
+{
|
|
+ union {
|
|
+ char name[EBT_FUNCTION_MAXNAMELEN];
|
|
+ struct ebt_watcher *watcher;
|
|
+ } u;
|
|
+ // size of data
|
|
+ unsigned int watcher_size;
|
|
+ unsigned char data[0];
|
|
+};
|
|
+
|
|
+struct ebt_entry_target
|
|
+{
|
|
+ union {
|
|
+ char name[EBT_FUNCTION_MAXNAMELEN];
|
|
+ struct ebt_target *target;
|
|
+ } u;
|
|
+ // size of data
|
|
+ unsigned int target_size;
|
|
+ unsigned char data[0];
|
|
+};
|
|
+
|
|
+#define EBT_STANDARD_TARGET "standard"
|
|
+struct ebt_standard_target
|
|
+{
|
|
+ struct ebt_entry_target target;
|
|
+ int verdict;
|
|
+};
|
|
+
|
|
+// one entry
|
|
+struct ebt_entry {
|
|
+ // this needs to be the first field
|
|
+ unsigned int bitmask;
|
|
+ unsigned int invflags;
|
|
+ uint16_t ethproto;
|
|
+ // the physical in-dev
|
|
+ char in[IFNAMSIZ];
|
|
+ // the logical in-dev
|
|
+ char logical_in[IFNAMSIZ];
|
|
+ // the physical out-dev
|
|
+ char out[IFNAMSIZ];
|
|
+ // the logical out-dev
|
|
+ char logical_out[IFNAMSIZ];
|
|
+ unsigned char sourcemac[ETH_ALEN];
|
|
+ unsigned char sourcemsk[ETH_ALEN];
|
|
+ unsigned char destmac[ETH_ALEN];
|
|
+ unsigned char destmsk[ETH_ALEN];
|
|
+ // sizeof ebt_entry + matches
|
|
+ unsigned int watchers_offset;
|
|
+ // sizeof ebt_entry + matches + watchers
|
|
+ unsigned int target_offset;
|
|
+ // sizeof ebt_entry + matches + watchers + target
|
|
+ unsigned int next_offset;
|
|
+ unsigned char elems[0];
|
|
+};
|
|
+
|
|
+struct ebt_replace
|
|
+{
|
|
+ char name[EBT_TABLE_MAXNAMELEN];
|
|
+ unsigned int valid_hooks;
|
|
+ // nr of rules in the table
|
|
+ unsigned int nentries;
|
|
+ // total size of the entries
|
|
+ unsigned int entries_size;
|
|
+ // start of the chains
|
|
+ struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
|
|
+ // nr of counters userspace expects back
|
|
+ unsigned int num_counters;
|
|
+ // where the kernel will put the old counters
|
|
+ struct ebt_counter *counters;
|
|
+ char *entries;
|
|
+};
|
|
+
|
|
+// [gs]etsockopt numbers
|
|
+#define EBT_BASE_CTL 128
|
|
+
|
|
+#define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
|
|
+#define EBT_SO_SET_COUNTERS (EBT_SO_SET_ENTRIES+1)
|
|
+#define EBT_SO_SET_MAX (EBT_SO_SET_COUNTERS+1)
|
|
+
|
|
+#define EBT_SO_GET_INFO (EBT_BASE_CTL)
|
|
+#define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO+1)
|
|
+#define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES+1)
|
|
+#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO+1)
|
|
+#define EBT_SO_GET_MAX (EBT_SO_GET_INIT_ENTRIES+1)
|
|
+
|
|
+#ifdef __KERNEL__
|
|
+
|
|
+// return values for match() functions
|
|
+#define EBT_MATCH 0
|
|
+#define EBT_NOMATCH 1
|
|
+
|
|
+struct ebt_match
|
|
+{
|
|
+ struct list_head list;
|
|
+ const char name[EBT_FUNCTION_MAXNAMELEN];
|
|
+ // 0 == it matches
|
|
+ int (*match)(const struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out, const void *matchdata,
|
|
+ unsigned int datalen);
|
|
+ // 0 == let it in
|
|
+ int (*check)(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *matchdata, unsigned int datalen);
|
|
+ void (*destroy)(void *matchdata, unsigned int datalen);
|
|
+ struct module *me;
|
|
+};
|
|
+
|
|
+struct ebt_watcher
|
|
+{
|
|
+ struct list_head list;
|
|
+ const char name[EBT_FUNCTION_MAXNAMELEN];
|
|
+ void (*watcher)(const struct sk_buff *skb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *watcherdata, unsigned int datalen);
|
|
+ // 0 == let it in
|
|
+ int (*check)(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *watcherdata, unsigned int datalen);
|
|
+ void (*destroy)(void *watcherdata, unsigned int datalen);
|
|
+ struct module *me;
|
|
+};
|
|
+
|
|
+struct ebt_target
|
|
+{
|
|
+ struct list_head list;
|
|
+ const char name[EBT_FUNCTION_MAXNAMELEN];
|
|
+ // returns one of the standard verdicts
|
|
+ int (*target)(struct sk_buff **pskb, unsigned int hooknr,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ const void *targetdata, unsigned int datalen);
|
|
+ // 0 == let it in
|
|
+ int (*check)(const char *tablename, unsigned int hookmask,
|
|
+ const struct ebt_entry *e, void *targetdata, unsigned int datalen);
|
|
+ void (*destroy)(void *targetdata, unsigned int datalen);
|
|
+ struct module *me;
|
|
+};
|
|
+
|
|
+// used for jumping from and into user defined chains (udc)
|
|
+struct ebt_chainstack
|
|
+{
|
|
+ struct ebt_entries *chaininfo; // pointer to chain data
|
|
+ struct ebt_entry *e; // pointer to entry data
|
|
+ unsigned int n; // n'th entry
|
|
+};
|
|
+
|
|
+struct ebt_table_info
|
|
+{
|
|
+ // total size of the entries
|
|
+ unsigned int entries_size;
|
|
+ unsigned int nentries;
|
|
+ // pointers to the start of the chains
|
|
+ struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
|
|
+ // room to maintain the stack used for jumping from and into udc
|
|
+ struct ebt_chainstack **chainstack;
|
|
+ char *entries;
|
|
+ struct ebt_counter counters[0] ____cacheline_aligned;
|
|
+};
|
|
+
|
|
+struct ebt_table
|
|
+{
|
|
+ struct list_head list;
|
|
+ char name[EBT_TABLE_MAXNAMELEN];
|
|
+ struct ebt_replace *table;
|
|
+ unsigned int valid_hooks;
|
|
+ rwlock_t lock;
|
|
+ // e.g. could be the table explicitly only allows certain
|
|
+ // matches, targets, ... 0 == let it in
|
|
+ int (*check)(const struct ebt_table_info *info,
|
|
+ unsigned int valid_hooks);
|
|
+ // the data used by the kernel
|
|
+ struct ebt_table_info *private;
|
|
+};
|
|
+
|
|
+#define EBT_ALIGN(s) (((s) + (__alignof__(struct ebt_entry_target)-1)) & \
|
|
+ ~(__alignof__(struct ebt_entry_target)-1))
|
|
+extern int ebt_register_table(struct ebt_table *table);
|
|
+extern void ebt_unregister_table(struct ebt_table *table);
|
|
+extern int ebt_register_match(struct ebt_match *match);
|
|
+extern void ebt_unregister_match(struct ebt_match *match);
|
|
+extern int ebt_register_watcher(struct ebt_watcher *watcher);
|
|
+extern void ebt_unregister_watcher(struct ebt_watcher *watcher);
|
|
+extern int ebt_register_target(struct ebt_target *target);
|
|
+extern void ebt_unregister_target(struct ebt_target *target);
|
|
+extern unsigned int ebt_do_table(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ struct ebt_table *table);
|
|
+
|
|
+ // Used in the kernel match() functions
|
|
+#define FWINV(bool,invflg) ((bool) ^ !!(info->invflags & invflg))
|
|
+// True if the hook mask denotes that the rule is in a base chain,
|
|
+// used in the check() functions
|
|
+#define BASE_CHAIN (hookmask & (1 << NF_BR_NUMHOOKS))
|
|
+// Clear the bit in the hook mask that tells if the rule is on a base chain
|
|
+#define CLEAR_BASE_CHAIN_BIT (hookmask &= ~(1 << NF_BR_NUMHOOKS))
|
|
+// True if the target is not a standard target
|
|
+#define INVALID_TARGET (info->target < -NUM_STANDARD_TARGETS || info->target >= 0)
|
|
+
|
|
+#endif /* __KERNEL__ */
|
|
+
|
|
+// blatently stolen from ip_tables.h
|
|
+// fn returns 0 to continue iteration
|
|
+#define EBT_MATCH_ITERATE(e, fn, args...) \
|
|
+({ \
|
|
+ unsigned int __i; \
|
|
+ int __ret = 0; \
|
|
+ struct ebt_entry_match *__match; \
|
|
+ \
|
|
+ for (__i = sizeof(struct ebt_entry); \
|
|
+ __i < (e)->watchers_offset; \
|
|
+ __i += __match->match_size + \
|
|
+ sizeof(struct ebt_entry_match)) { \
|
|
+ __match = (void *)(e) + __i; \
|
|
+ \
|
|
+ __ret = fn(__match , ## args); \
|
|
+ if (__ret != 0) \
|
|
+ break; \
|
|
+ } \
|
|
+ if (__ret == 0) { \
|
|
+ if (__i != (e)->watchers_offset) \
|
|
+ __ret = -EINVAL; \
|
|
+ } \
|
|
+ __ret; \
|
|
+})
|
|
+
|
|
+#define EBT_WATCHER_ITERATE(e, fn, args...) \
|
|
+({ \
|
|
+ unsigned int __i; \
|
|
+ int __ret = 0; \
|
|
+ struct ebt_entry_watcher *__watcher; \
|
|
+ \
|
|
+ for (__i = e->watchers_offset; \
|
|
+ __i < (e)->target_offset; \
|
|
+ __i += __watcher->watcher_size + \
|
|
+ sizeof(struct ebt_entry_watcher)) { \
|
|
+ __watcher = (void *)(e) + __i; \
|
|
+ \
|
|
+ __ret = fn(__watcher , ## args); \
|
|
+ if (__ret != 0) \
|
|
+ break; \
|
|
+ } \
|
|
+ if (__ret == 0) { \
|
|
+ if (__i != (e)->target_offset) \
|
|
+ __ret = -EINVAL; \
|
|
+ } \
|
|
+ __ret; \
|
|
+})
|
|
+
|
|
+#define EBT_ENTRY_ITERATE(entries, size, fn, args...) \
|
|
+({ \
|
|
+ unsigned int __i; \
|
|
+ int __ret = 0; \
|
|
+ struct ebt_entry *__entry; \
|
|
+ \
|
|
+ for (__i = 0; __i < (size);) { \
|
|
+ __entry = (void *)(entries) + __i; \
|
|
+ __ret = fn(__entry , ## args); \
|
|
+ if (__ret != 0) \
|
|
+ break; \
|
|
+ if (__entry->bitmask != 0) \
|
|
+ __i += __entry->next_offset; \
|
|
+ else \
|
|
+ __i += sizeof(struct ebt_entries); \
|
|
+ } \
|
|
+ if (__ret == 0) { \
|
|
+ if (__i != (size)) \
|
|
+ __ret = -EINVAL; \
|
|
+ } \
|
|
+ __ret; \
|
|
+})
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_among.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,65 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_AMONG_H
|
|
+#define __LINUX_BRIDGE_EBT_AMONG_H
|
|
+
|
|
+#define EBT_AMONG_DST 0x01
|
|
+#define EBT_AMONG_SRC 0x02
|
|
+
|
|
+/* Grzegorz Borowiak <grzes@gnu.univ.gda.pl> 2003
|
|
+ *
|
|
+ * Write-once-read-many hash table, used for checking if a given
|
|
+ * MAC address belongs to a set or not and possibly for checking
|
|
+ * if it is related with a given IPv4 address.
|
|
+ *
|
|
+ * The hash value of an address is its last byte.
|
|
+ *
|
|
+ * In real-world ethernet addresses, values of the last byte are
|
|
+ * evenly distributed and there is no need to consider other bytes.
|
|
+ * It would only slow the routines down.
|
|
+ *
|
|
+ * For MAC address comparison speedup reasons, we introduce a trick.
|
|
+ * MAC address is mapped onto an array of two 32-bit integers.
|
|
+ * This pair of integers is compared with MAC addresses in the
|
|
+ * hash table, which are stored also in form of pairs of integers
|
|
+ * (in `cmp' array). This is quick as it requires only two elementary
|
|
+ * number comparisons in worst case. Further, we take advantage of
|
|
+ * fact that entropy of 3 last bytes of address is larger than entropy
|
|
+ * of 3 first bytes. So first we compare 4 last bytes of addresses and
|
|
+ * if they are the same we compare 2 first.
|
|
+ *
|
|
+ * Yes, it is a memory overhead, but in 2003 AD, who cares?
|
|
+ */
|
|
+
|
|
+struct ebt_mac_wormhash_tuple
|
|
+{
|
|
+ uint32_t cmp[2];
|
|
+ uint32_t ip;
|
|
+};
|
|
+
|
|
+struct ebt_mac_wormhash
|
|
+{
|
|
+ int table[257];
|
|
+ int poolsize;
|
|
+ struct ebt_mac_wormhash_tuple pool[0];
|
|
+};
|
|
+
|
|
+#define ebt_mac_wormhash_size(x) ((x) ? sizeof(struct ebt_mac_wormhash) \
|
|
+ + (x)->poolsize * sizeof(struct ebt_mac_wormhash_tuple) : 0)
|
|
+
|
|
+struct ebt_among_info
|
|
+{
|
|
+ int wh_dst_ofs;
|
|
+ int wh_src_ofs;
|
|
+ int bitmask;
|
|
+};
|
|
+
|
|
+#define EBT_AMONG_DST_NEG 0x1
|
|
+#define EBT_AMONG_SRC_NEG 0x2
|
|
+
|
|
+#define ebt_among_wh_dst(x) ((x)->wh_dst_ofs ? \
|
|
+ (struct ebt_mac_wormhash*)((char*)(x) + (x)->wh_dst_ofs) : NULL)
|
|
+#define ebt_among_wh_src(x) ((x)->wh_src_ofs ? \
|
|
+ (struct ebt_mac_wormhash*)((char*)(x) + (x)->wh_src_ofs) : NULL)
|
|
+
|
|
+#define EBT_AMONG_MATCH "among"
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_limit.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,23 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_LIMIT_H
|
|
+#define __LINUX_BRIDGE_EBT_LIMIT_H
|
|
+
|
|
+#define EBT_LIMIT_MATCH "limit"
|
|
+
|
|
+/* timings are in milliseconds. */
|
|
+#define EBT_LIMIT_SCALE 10000
|
|
+
|
|
+/* 1/10,000 sec period => max of 10,000/sec. Min rate is then 429490
|
|
+ seconds, or one every 59 hours. */
|
|
+
|
|
+struct ebt_limit_info
|
|
+{
|
|
+ u_int32_t avg; /* Average secs between packets * scale */
|
|
+ u_int32_t burst; /* Period multiplier for upper limit. */
|
|
+
|
|
+ /* Used internally by the kernel */
|
|
+ unsigned long prev;
|
|
+ u_int32_t credit;
|
|
+ u_int32_t credit_cap, cost;
|
|
+};
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_arpreply.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,11 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_ARPREPLY_H
|
|
+#define __LINUX_BRIDGE_EBT_ARPREPLY_H
|
|
+
|
|
+struct ebt_arpreply_info
|
|
+{
|
|
+ unsigned char mac[ETH_ALEN];
|
|
+ int target;
|
|
+};
|
|
+#define EBT_ARPREPLY_TARGET "arpreply"
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_802_3.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,60 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_802_3_H
|
|
+#define __LINUX_BRIDGE_EBT_802_3_H
|
|
+
|
|
+#define EBT_802_3_SAP 0x01
|
|
+#define EBT_802_3_TYPE 0x02
|
|
+
|
|
+#define EBT_802_3_MATCH "802_3"
|
|
+
|
|
+/*
|
|
+ * If frame has DSAP/SSAP value 0xaa you must check the SNAP type
|
|
+ * to discover what kind of packet we're carrying.
|
|
+ */
|
|
+#define CHECK_TYPE 0xaa
|
|
+
|
|
+/*
|
|
+ * Control field may be one or two bytes. If the first byte has
|
|
+ * the value 0x03 then the entire length is one byte, otherwise it is two.
|
|
+ * One byte controls are used in Unnumbered Information frames.
|
|
+ * Two byte controls are used in Numbered Information frames.
|
|
+ */
|
|
+#define IS_UI 0x03
|
|
+
|
|
+#define EBT_802_3_MASK (EBT_802_3_SAP | EBT_802_3_TYPE | EBT_802_3)
|
|
+
|
|
+/* ui has one byte ctrl, ni has two */
|
|
+struct hdr_ui {
|
|
+ uint8_t dsap;
|
|
+ uint8_t ssap;
|
|
+ uint8_t ctrl;
|
|
+ uint8_t orig[3];
|
|
+ uint16_t type;
|
|
+};
|
|
+
|
|
+struct hdr_ni {
|
|
+ uint8_t dsap;
|
|
+ uint8_t ssap;
|
|
+ uint16_t ctrl;
|
|
+ uint8_t orig[3];
|
|
+ uint16_t type;
|
|
+};
|
|
+
|
|
+struct ebt_802_3_hdr {
|
|
+ uint8_t daddr[6];
|
|
+ uint8_t saddr[6];
|
|
+ uint16_t len;
|
|
+ union {
|
|
+ struct hdr_ui ui;
|
|
+ struct hdr_ni ni;
|
|
+ } llc;
|
|
+};
|
|
+
|
|
+struct ebt_802_3_info
|
|
+{
|
|
+ uint8_t sap;
|
|
+ uint16_t type;
|
|
+ uint8_t bitmask;
|
|
+ uint8_t invflags;
|
|
+};
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_arp.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,32 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_ARP_H
|
|
+#define __LINUX_BRIDGE_EBT_ARP_H
|
|
+
|
|
+#define EBT_ARP_OPCODE 0x01
|
|
+#define EBT_ARP_HTYPE 0x02
|
|
+#define EBT_ARP_PTYPE 0x04
|
|
+#define EBT_ARP_SRC_IP 0x08
|
|
+#define EBT_ARP_DST_IP 0x10
|
|
+#define EBT_ARP_SRC_MAC 0x20
|
|
+#define EBT_ARP_DST_MAC 0x40
|
|
+#define EBT_ARP_MASK (EBT_ARP_OPCODE | EBT_ARP_HTYPE | EBT_ARP_PTYPE | \
|
|
+ EBT_ARP_SRC_IP | EBT_ARP_DST_IP | EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC)
|
|
+#define EBT_ARP_MATCH "arp"
|
|
+
|
|
+struct ebt_arp_info
|
|
+{
|
|
+ uint16_t htype;
|
|
+ uint16_t ptype;
|
|
+ uint16_t opcode;
|
|
+ uint32_t saddr;
|
|
+ uint32_t smsk;
|
|
+ uint32_t daddr;
|
|
+ uint32_t dmsk;
|
|
+ unsigned char smaddr[ETH_ALEN];
|
|
+ unsigned char smmsk[ETH_ALEN];
|
|
+ unsigned char dmaddr[ETH_ALEN];
|
|
+ unsigned char dmmsk[ETH_ALEN];
|
|
+ uint8_t bitmask;
|
|
+ uint8_t invflags;
|
|
+};
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_ip.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,43 @@
|
|
+/*
|
|
+ * ebt_ip
|
|
+ *
|
|
+ * Authors:
|
|
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
|
|
+ *
|
|
+ * April, 2002
|
|
+ *
|
|
+ * Changes:
|
|
+ * added ip-sport and ip-dport
|
|
+ * Innominate Security Technologies AG <mhopf@innominate.com>
|
|
+ * September, 2002
|
|
+ */
|
|
+
|
|
+#ifndef __LINUX_BRIDGE_EBT_IP_H
|
|
+#define __LINUX_BRIDGE_EBT_IP_H
|
|
+
|
|
+#define EBT_IP_SOURCE 0x01
|
|
+#define EBT_IP_DEST 0x02
|
|
+#define EBT_IP_TOS 0x04
|
|
+#define EBT_IP_PROTO 0x08
|
|
+#define EBT_IP_SPORT 0x10
|
|
+#define EBT_IP_DPORT 0x20
|
|
+#define EBT_IP_MASK (EBT_IP_SOURCE | EBT_IP_DEST | EBT_IP_TOS | EBT_IP_PROTO |\
|
|
+ EBT_IP_SPORT | EBT_IP_DPORT )
|
|
+#define EBT_IP_MATCH "ip"
|
|
+
|
|
+// the same values are used for the invflags
|
|
+struct ebt_ip_info
|
|
+{
|
|
+ uint32_t saddr;
|
|
+ uint32_t daddr;
|
|
+ uint32_t smsk;
|
|
+ uint32_t dmsk;
|
|
+ uint8_t tos;
|
|
+ uint8_t protocol;
|
|
+ uint8_t bitmask;
|
|
+ uint8_t invflags;
|
|
+ uint16_t sport[2];
|
|
+ uint16_t dport[2];
|
|
+};
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_pkttype.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,11 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_PKTTYPE_H
|
|
+#define __LINUX_BRIDGE_EBT_PKTTYPE_H
|
|
+
|
|
+struct ebt_pkttype_info
|
|
+{
|
|
+ uint8_t pkt_type;
|
|
+ uint8_t invert;
|
|
+};
|
|
+#define EBT_PKTTYPE_MATCH "pkttype"
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_stp.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,46 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_STP_H
|
|
+#define __LINUX_BRIDGE_EBT_STP_H
|
|
+
|
|
+#define EBT_STP_TYPE 0x0001
|
|
+
|
|
+#define EBT_STP_FLAGS 0x0002
|
|
+#define EBT_STP_ROOTPRIO 0x0004
|
|
+#define EBT_STP_ROOTADDR 0x0008
|
|
+#define EBT_STP_ROOTCOST 0x0010
|
|
+#define EBT_STP_SENDERPRIO 0x0020
|
|
+#define EBT_STP_SENDERADDR 0x0040
|
|
+#define EBT_STP_PORT 0x0080
|
|
+#define EBT_STP_MSGAGE 0x0100
|
|
+#define EBT_STP_MAXAGE 0x0200
|
|
+#define EBT_STP_HELLOTIME 0x0400
|
|
+#define EBT_STP_FWDD 0x0800
|
|
+
|
|
+#define EBT_STP_MASK 0x0fff
|
|
+#define EBT_STP_CONFIG_MASK 0x0ffe
|
|
+
|
|
+#define EBT_STP_MATCH "stp"
|
|
+
|
|
+struct ebt_stp_config_info
|
|
+{
|
|
+ uint8_t flags;
|
|
+ uint16_t root_priol, root_priou;
|
|
+ char root_addr[6], root_addrmsk[6];
|
|
+ uint32_t root_costl, root_costu;
|
|
+ uint16_t sender_priol, sender_priou;
|
|
+ char sender_addr[6], sender_addrmsk[6];
|
|
+ uint16_t portl, portu;
|
|
+ uint16_t msg_agel, msg_ageu;
|
|
+ uint16_t max_agel, max_ageu;
|
|
+ uint16_t hello_timel, hello_timeu;
|
|
+ uint16_t forward_delayl, forward_delayu;
|
|
+};
|
|
+
|
|
+struct ebt_stp_info
|
|
+{
|
|
+ uint8_t type;
|
|
+ struct ebt_stp_config_info config;
|
|
+ uint16_t bitmask;
|
|
+ uint16_t invflags;
|
|
+};
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_vlan.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,20 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_VLAN_H
|
|
+#define __LINUX_BRIDGE_EBT_VLAN_H
|
|
+
|
|
+#define EBT_VLAN_ID 0x01
|
|
+#define EBT_VLAN_PRIO 0x02
|
|
+#define EBT_VLAN_ENCAP 0x04
|
|
+#define EBT_VLAN_MASK (EBT_VLAN_ID | EBT_VLAN_PRIO | EBT_VLAN_ENCAP)
|
|
+#define EBT_VLAN_MATCH "vlan"
|
|
+
|
|
+struct ebt_vlan_info {
|
|
+ uint16_t id; /* VLAN ID {1-4095} */
|
|
+ uint8_t prio; /* VLAN User Priority {0-7} */
|
|
+ uint16_t encap; /* VLAN Encapsulated frame code {0-65535} */
|
|
+ uint8_t bitmask; /* Args bitmask bit 1=1 - ID arg,
|
|
+ bit 2=1 User-Priority arg, bit 3=1 encap*/
|
|
+ uint8_t invflags; /* Inverse bitmask bit 1=1 - inversed ID arg,
|
|
+ bit 2=1 - inversed Pirority arg */
|
|
+};
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_log.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,17 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_LOG_H
|
|
+#define __LINUX_BRIDGE_EBT_LOG_H
|
|
+
|
|
+#define EBT_LOG_IP 0x01 // if the frame is made by ip, log the ip information
|
|
+#define EBT_LOG_ARP 0x02
|
|
+#define EBT_LOG_MASK (EBT_LOG_IP | EBT_LOG_ARP)
|
|
+#define EBT_LOG_PREFIX_SIZE 30
|
|
+#define EBT_LOG_WATCHER "log"
|
|
+
|
|
+struct ebt_log_info
|
|
+{
|
|
+ uint8_t loglevel;
|
|
+ uint8_t prefix[EBT_LOG_PREFIX_SIZE];
|
|
+ uint32_t bitmask;
|
|
+};
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_ulog.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,33 @@
|
|
+#ifndef _EBT_ULOG_H
|
|
+#define _EBT_ULOG_H
|
|
+
|
|
+#define EBT_ULOG_DEFAULT_NLGROUP 0
|
|
+#define EBT_ULOG_DEFAULT_QTHRESHOLD 1
|
|
+#define EBT_ULOG_MAXNLGROUPS 32 /* hardcoded netlink max */
|
|
+#define EBT_ULOG_PREFIX_LEN 32
|
|
+#define EBT_ULOG_MAX_QLEN 50
|
|
+#define EBT_ULOG_WATCHER "ulog"
|
|
+
|
|
+struct ebt_ulog_info {
|
|
+ uint32_t nlgroup;
|
|
+ unsigned int cprange;
|
|
+ unsigned int qthreshold;
|
|
+ char prefix[EBT_ULOG_PREFIX_LEN];
|
|
+};
|
|
+
|
|
+typedef struct ebt_ulog_packet_msg {
|
|
+ char indev[IFNAMSIZ];
|
|
+ char outdev[IFNAMSIZ];
|
|
+ char physindev[IFNAMSIZ];
|
|
+ char physoutdev[IFNAMSIZ];
|
|
+ char prefix[EBT_ULOG_PREFIX_LEN];
|
|
+ struct timeval stamp;
|
|
+ unsigned long mark;
|
|
+ unsigned int hook;
|
|
+ size_t data_len;
|
|
+ /* The complete packet, including Ethernet header and perhaps
|
|
+ * the VLAN header is appended */
|
|
+ unsigned char data[0] __attribute__ ((aligned (__alignof__(int))));
|
|
+} ebt_ulog_packet_msg_t;
|
|
+
|
|
+#endif /* _EBT_ULOG_H */
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_nat.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,13 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_NAT_H
|
|
+#define __LINUX_BRIDGE_EBT_NAT_H
|
|
+
|
|
+struct ebt_nat_info
|
|
+{
|
|
+ unsigned char mac[ETH_ALEN];
|
|
+ // EBT_ACCEPT, EBT_DROP, EBT_CONTINUE or EBT_RETURN
|
|
+ int target;
|
|
+};
|
|
+#define EBT_SNAT_TARGET "snat"
|
|
+#define EBT_DNAT_TARGET "dnat"
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_redirect.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,11 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_REDIRECT_H
|
|
+#define __LINUX_BRIDGE_EBT_REDIRECT_H
|
|
+
|
|
+struct ebt_redirect_info
|
|
+{
|
|
+ // EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
|
|
+ int target;
|
|
+};
|
|
+#define EBT_REDIRECT_TARGET "redirect"
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_mark_m.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,15 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_MARK_M_H
|
|
+#define __LINUX_BRIDGE_EBT_MARK_M_H
|
|
+
|
|
+#define EBT_MARK_AND 0x01
|
|
+#define EBT_MARK_OR 0x02
|
|
+#define EBT_MARK_MASK (EBT_MARK_AND | EBT_MARK_OR)
|
|
+struct ebt_mark_m_info
|
|
+{
|
|
+ unsigned long mark, mask;
|
|
+ uint8_t invert;
|
|
+ uint8_t bitmask;
|
|
+};
|
|
+#define EBT_MARK_MATCH "mark_m"
|
|
+
|
|
+#endif
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_bridge/ebt_mark_t.h 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,12 @@
|
|
+#ifndef __LINUX_BRIDGE_EBT_MARK_T_H
|
|
+#define __LINUX_BRIDGE_EBT_MARK_T_H
|
|
+
|
|
+struct ebt_mark_t_info
|
|
+{
|
|
+ unsigned long mark;
|
|
+ // EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
|
|
+ int target;
|
|
+};
|
|
+#define EBT_MARK_TARGET "mark"
|
|
+
|
|
+#endif
|
|
--- linux-2.4.29/include/linux/netfilter.h 2005-01-19 15:10:12.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter.h 2005-03-14 21:11:36.000000000 +0100
|
|
@@ -17,7 +17,8 @@
|
|
#define NF_STOLEN 2
|
|
#define NF_QUEUE 3
|
|
#define NF_REPEAT 4
|
|
-#define NF_MAX_VERDICT NF_REPEAT
|
|
+#define NF_STOP 5
|
|
+#define NF_MAX_VERDICT NF_STOP
|
|
|
|
/* Generic cache responses from hook functions.
|
|
<= 0x2000 is used for protocol-flags. */
|
|
@@ -118,17 +119,34 @@ extern struct list_head nf_hooks[NPROTO]
|
|
/* This is gross, but inline doesn't cut it for avoiding the function
|
|
call in fast path: gcc doesn't inline (needs value tracking?). --RR */
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
-#define NF_HOOK nf_hook_slow
|
|
+#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
|
|
+({int __ret; \
|
|
+if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \
|
|
+ __ret = (okfn)(skb); \
|
|
+__ret;})
|
|
+#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
|
|
+({int __ret; \
|
|
+if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1) \
|
|
+ __ret = (okfn)(skb); \
|
|
+__ret;})
|
|
#else
|
|
-#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
|
|
-(list_empty(&nf_hooks[(pf)][(hook)]) \
|
|
- ? (okfn)(skb) \
|
|
- : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn)))
|
|
+#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
|
|
+({int __ret; \
|
|
+if (list_empty(&nf_hooks[pf][hook]) || \
|
|
+ (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \
|
|
+ __ret = (okfn)(skb); \
|
|
+__ret;})
|
|
+#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
|
|
+({int __ret; \
|
|
+if (list_empty(&nf_hooks[pf][hook]) || \
|
|
+ (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1) \
|
|
+ __ret = (okfn)(skb); \
|
|
+__ret;})
|
|
#endif
|
|
|
|
-int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
|
|
+int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb,
|
|
struct net_device *indev, struct net_device *outdev,
|
|
- int (*okfn)(struct sk_buff *));
|
|
+ int (*okfn)(struct sk_buff *), int thresh);
|
|
|
|
/* Call setsockopt() */
|
|
int nf_setsockopt(struct sock *sk, int pf, int optval, char *opt,
|
|
--- linux-2.4.29/include/linux/netfilter_ipv4.h 2002-02-25 20:38:13.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv4.h 2005-03-14 21:11:36.000000000 +0100
|
|
@@ -52,8 +52,10 @@
|
|
enum nf_ip_hook_priorities {
|
|
NF_IP_PRI_FIRST = INT_MIN,
|
|
NF_IP_PRI_CONNTRACK = -200,
|
|
+ NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
|
|
NF_IP_PRI_MANGLE = -150,
|
|
NF_IP_PRI_NAT_DST = -100,
|
|
+ NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
|
|
NF_IP_PRI_FILTER = 0,
|
|
NF_IP_PRI_NAT_SRC = 100,
|
|
NF_IP_PRI_LAST = INT_MAX,
|
|
--- linux-2.4.29/include/linux/netfilter_ipv6.h 2001-01-02 01:17:54.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv6.h 2005-03-14 21:24:11.000000000 +0100
|
|
@@ -57,8 +57,10 @@
|
|
enum nf_ip6_hook_priorities {
|
|
NF_IP6_PRI_FIRST = INT_MIN,
|
|
NF_IP6_PRI_CONNTRACK = -200,
|
|
+ NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
|
|
NF_IP6_PRI_MANGLE = -150,
|
|
NF_IP6_PRI_NAT_DST = -100,
|
|
+ NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
|
|
NF_IP6_PRI_FILTER = 0,
|
|
NF_IP6_PRI_NAT_SRC = 100,
|
|
NF_IP6_PRI_LAST = INT_MAX,
|
|
--- linux-2.4.29/include/linux/skbuff.h 2004-08-08 01:26:06.000000000 +0200
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/skbuff.h 2005-03-14 21:07:31.000000000 +0100
|
|
@@ -92,6 +92,20 @@ struct nf_conntrack {
|
|
struct nf_ct_info {
|
|
struct nf_conntrack *master;
|
|
};
|
|
+
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+struct nf_bridge_info {
|
|
+ atomic_t use;
|
|
+ struct net_device *physindev;
|
|
+ struct net_device *physoutdev;
|
|
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
|
|
+ struct net_device *netoutdev;
|
|
+#endif
|
|
+ unsigned int mask;
|
|
+ unsigned long data[32 / sizeof(unsigned long)];
|
|
+};
|
|
+#endif
|
|
+
|
|
#endif
|
|
|
|
struct sk_buff_head {
|
|
@@ -208,6 +222,9 @@ struct sk_buff {
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
unsigned int nf_debug;
|
|
#endif
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ struct nf_bridge_info *nf_bridge; /* Saved data about a bridged frame - see br_netfilter.c */
|
|
+#endif
|
|
#endif /*CONFIG_NETFILTER*/
|
|
|
|
#if defined(CONFIG_HIPPI)
|
|
@@ -1175,6 +1192,20 @@ nf_reset(struct sk_buff *skb)
|
|
skb->nf_debug = 0;
|
|
#endif
|
|
}
|
|
+
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge)
|
|
+{
|
|
+ if (nf_bridge && atomic_dec_and_test(&nf_bridge->use))
|
|
+ kfree(nf_bridge);
|
|
+}
|
|
+static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge)
|
|
+{
|
|
+ if (nf_bridge)
|
|
+ atomic_inc(&nf_bridge->use);
|
|
+}
|
|
+#endif
|
|
+
|
|
#else /* CONFIG_NETFILTER */
|
|
static inline void nf_reset(struct sk_buff *skb) {}
|
|
#endif /* CONFIG_NETFILTER */
|
|
--- linux-2.4.29/net/core/netfilter.c 2005-01-19 15:10:13.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/core/netfilter.c 2005-03-14 21:21:41.825275416 +0100
|
|
@@ -342,32 +342,29 @@ static unsigned int nf_iterate(struct li
|
|
const struct net_device *indev,
|
|
const struct net_device *outdev,
|
|
struct list_head **i,
|
|
- int (*okfn)(struct sk_buff *))
|
|
+ int (*okfn)(struct sk_buff *),
|
|
+ int hook_thresh)
|
|
{
|
|
+ unsigned int verdict;
|
|
+
|
|
for (*i = (*i)->next; *i != head; *i = (*i)->next) {
|
|
struct nf_hook_ops *elem = (struct nf_hook_ops *)*i;
|
|
- switch (elem->hook(hook, skb, indev, outdev, okfn)) {
|
|
- case NF_QUEUE:
|
|
- return NF_QUEUE;
|
|
-
|
|
- case NF_STOLEN:
|
|
- return NF_STOLEN;
|
|
-
|
|
- case NF_DROP:
|
|
- return NF_DROP;
|
|
|
|
- case NF_REPEAT:
|
|
- *i = (*i)->prev;
|
|
- break;
|
|
+ if (hook_thresh > elem->priority)
|
|
+ continue;
|
|
|
|
+ verdict = elem->hook(hook, skb, indev, outdev, okfn);
|
|
+ if (verdict != NF_ACCEPT) {
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
- case NF_ACCEPT:
|
|
- break;
|
|
-
|
|
- default:
|
|
- NFDEBUG("Evil return from %p(%u).\n",
|
|
- elem->hook, hook);
|
|
+ if (unlikely(verdict > NF_MAX_VERDICT)) {
|
|
+ NFDEBUG("Evil return from %p(%u).\n",
|
|
+ elem->hook, hook);
|
|
+ continue;
|
|
+ }
|
|
#endif
|
|
+ if (verdict != NF_REPEAT)
|
|
+ return verdict;
|
|
+ *i = (*i)->prev;
|
|
}
|
|
}
|
|
return NF_ACCEPT;
|
|
@@ -413,6 +410,10 @@ static void nf_queue(struct sk_buff *skb
|
|
{
|
|
int status;
|
|
struct nf_info *info;
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ struct net_device *physindev = NULL;
|
|
+ struct net_device *physoutdev = NULL;
|
|
+#endif
|
|
|
|
if (!queue_handler[pf].outfn) {
|
|
kfree_skb(skb);
|
|
@@ -435,36 +436,52 @@ static void nf_queue(struct sk_buff *skb
|
|
if (indev) dev_hold(indev);
|
|
if (outdev) dev_hold(outdev);
|
|
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ if (skb->nf_bridge) {
|
|
+ physindev = skb->nf_bridge->physindev;
|
|
+ if (physindev) dev_hold(physindev);
|
|
+ physoutdev = skb->nf_bridge->physoutdev;
|
|
+ if (physoutdev) dev_hold(physoutdev);
|
|
+ }
|
|
+#endif
|
|
+
|
|
status = queue_handler[pf].outfn(skb, info, queue_handler[pf].data);
|
|
if (status < 0) {
|
|
/* James M doesn't say fuck enough. */
|
|
if (indev) dev_put(indev);
|
|
if (outdev) dev_put(outdev);
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ if (physindev) dev_put(physindev);
|
|
+ if (physoutdev) dev_put(physoutdev);
|
|
+#endif
|
|
kfree(info);
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
}
|
|
|
|
-int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
|
|
+/* Returns 1 if okfn() needs to be executed by the caller,
|
|
+ * -EPERM for NF_DROP, 0 otherwise. */
|
|
+int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb,
|
|
struct net_device *indev,
|
|
struct net_device *outdev,
|
|
- int (*okfn)(struct sk_buff *))
|
|
+ int (*okfn)(struct sk_buff *),
|
|
+ int hook_thresh)
|
|
{
|
|
struct list_head *elem;
|
|
unsigned int verdict;
|
|
int ret = 0;
|
|
|
|
/* This stopgap cannot be removed until all the hooks are audited. */
|
|
- if (skb_is_nonlinear(skb) && skb_linearize(skb, GFP_ATOMIC) != 0) {
|
|
- kfree_skb(skb);
|
|
+ if (skb_is_nonlinear(*pskb) && skb_linearize(*pskb, GFP_ATOMIC) != 0) {
|
|
+ kfree_skb(*pskb);
|
|
return -ENOMEM;
|
|
}
|
|
- if (skb->ip_summed == CHECKSUM_HW) {
|
|
+ if ((*pskb)->ip_summed == CHECKSUM_HW) {
|
|
if (outdev == NULL) {
|
|
- skb->ip_summed = CHECKSUM_NONE;
|
|
+ (*pskb)->ip_summed = CHECKSUM_NONE;
|
|
} else {
|
|
- skb_checksum_help(skb);
|
|
+ skb_checksum_help(*pskb);
|
|
}
|
|
}
|
|
|
|
@@ -472,30 +489,24 @@ int nf_hook_slow(int pf, unsigned int ho
|
|
br_read_lock_bh(BR_NETPROTO_LOCK);
|
|
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
- if (skb->nf_debug & (1 << hook)) {
|
|
+ if (unlikely((*pskb)->nf_debug & (1 << hook))) {
|
|
printk("nf_hook: hook %i already set.\n", hook);
|
|
- nf_dump_skb(pf, skb);
|
|
+ nf_dump_skb(pf, *pskb);
|
|
}
|
|
- skb->nf_debug |= (1 << hook);
|
|
+ (*pskb)->nf_debug |= (1 << hook);
|
|
#endif
|
|
|
|
elem = &nf_hooks[pf][hook];
|
|
- verdict = nf_iterate(&nf_hooks[pf][hook], &skb, hook, indev,
|
|
- outdev, &elem, okfn);
|
|
- if (verdict == NF_QUEUE) {
|
|
- NFDEBUG("nf_hook: Verdict = QUEUE.\n");
|
|
- nf_queue(skb, elem, pf, hook, indev, outdev, okfn);
|
|
- }
|
|
-
|
|
- switch (verdict) {
|
|
- case NF_ACCEPT:
|
|
- ret = okfn(skb);
|
|
- break;
|
|
-
|
|
- case NF_DROP:
|
|
- kfree_skb(skb);
|
|
+ verdict = nf_iterate(&nf_hooks[pf][hook], pskb, hook, indev,
|
|
+ outdev, &elem, okfn, hook_thresh);
|
|
+ if (verdict == NF_ACCEPT || verdict == NF_STOP)
|
|
+ ret = 1;
|
|
+ else if (verdict == NF_DROP) {
|
|
+ kfree_skb(*pskb);
|
|
ret = -EPERM;
|
|
- break;
|
|
+ } else if (verdict == NF_QUEUE) {
|
|
+ NFDEBUG("nf_hook: Verdict = QUEUE.\n");
|
|
+ nf_queue(*pskb, elem, pf, hook, indev, outdev, okfn);
|
|
}
|
|
|
|
br_read_unlock_bh(BR_NETPROTO_LOCK);
|
|
@@ -510,6 +521,14 @@ void nf_reinject(struct sk_buff *skb, st
|
|
|
|
/* We don't have BR_NETPROTO_LOCK here */
|
|
br_read_lock_bh(BR_NETPROTO_LOCK);
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ if (skb->nf_bridge) {
|
|
+ if (skb->nf_bridge->physindev)
|
|
+ dev_put(skb->nf_bridge->physindev);
|
|
+ if (skb->nf_bridge->physoutdev)
|
|
+ dev_put(skb->nf_bridge->physoutdev);
|
|
+ }
|
|
+#endif
|
|
for (i = nf_hooks[info->pf][info->hook].next; i != elem; i = i->next) {
|
|
if (i == &nf_hooks[info->pf][info->hook]) {
|
|
/* The module which sent it to userspace is gone. */
|
|
@@ -530,7 +549,7 @@ void nf_reinject(struct sk_buff *skb, st
|
|
verdict = nf_iterate(&nf_hooks[info->pf][info->hook],
|
|
&skb, info->hook,
|
|
info->indev, info->outdev, &elem,
|
|
- info->okfn);
|
|
+ info->okfn, INT_MIN);
|
|
}
|
|
|
|
switch (verdict) {
|
|
--- linux-2.4.29/net/core/skbuff.c 2003-08-25 13:44:44.000000000 +0200
|
|
+++ linux-2.4.29-ebt-brnf/net/core/skbuff.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -246,6 +246,9 @@ static inline void skb_headerinit(void *
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
skb->nf_debug = 0;
|
|
#endif
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ skb->nf_bridge = NULL;
|
|
+#endif
|
|
#endif
|
|
#ifdef CONFIG_NET_SCHED
|
|
skb->tc_index = 0;
|
|
@@ -326,6 +329,9 @@ void __kfree_skb(struct sk_buff *skb)
|
|
}
|
|
#ifdef CONFIG_NETFILTER
|
|
nf_conntrack_put(skb->nfct);
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ nf_bridge_put(skb->nf_bridge);
|
|
+#endif
|
|
#endif
|
|
skb_headerinit(skb, NULL, 0); /* clean state */
|
|
kfree_skbmem(skb);
|
|
@@ -393,6 +399,9 @@ struct sk_buff *skb_clone(struct sk_buff
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
C(nf_debug);
|
|
#endif
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ C(nf_bridge);
|
|
+#endif
|
|
#endif /*CONFIG_NETFILTER*/
|
|
#if defined(CONFIG_HIPPI)
|
|
C(private);
|
|
@@ -405,6 +414,9 @@ struct sk_buff *skb_clone(struct sk_buff
|
|
skb->cloned = 1;
|
|
#ifdef CONFIG_NETFILTER
|
|
nf_conntrack_get(skb->nfct);
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ nf_bridge_get(skb->nf_bridge);
|
|
+#endif
|
|
#endif
|
|
return n;
|
|
}
|
|
@@ -440,6 +452,10 @@ static void copy_skb_header(struct sk_bu
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
new->nf_debug=old->nf_debug;
|
|
#endif
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ new->nf_bridge=old->nf_bridge;
|
|
+ nf_bridge_get(new->nf_bridge);
|
|
+#endif
|
|
#endif
|
|
#ifdef CONFIG_NET_SCHED
|
|
new->tc_index = old->tc_index;
|
|
@@ -726,9 +742,9 @@ struct sk_buff *skb_copy_expand(const st
|
|
/* Set the tail pointer and length */
|
|
skb_put(n,skb->len);
|
|
|
|
- /* Copy the data only. */
|
|
- if (skb_copy_bits(skb, 0, n->data, skb->len))
|
|
- BUG();
|
|
+ /* Copy the linear data and header. */
|
|
+ if (skb_copy_bits(skb, -newheadroom, n->head, newheadroom + skb->len))
|
|
+ BUG();
|
|
|
|
copy_skb_header(n, skb);
|
|
return n;
|
|
--- linux-2.4.29/net/ipv4/netfilter/ip_tables.c 2005-01-19 15:10:13.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/ip_tables.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -118,12 +118,19 @@ static LIST_HEAD(ipt_tables);
|
|
static inline int
|
|
ip_packet_match(const struct iphdr *ip,
|
|
const char *indev,
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ const char *physindev,
|
|
+#endif
|
|
const char *outdev,
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ const char *physoutdev,
|
|
+#endif
|
|
const struct ipt_ip *ipinfo,
|
|
int isfrag)
|
|
{
|
|
size_t i;
|
|
unsigned long ret;
|
|
+ unsigned long ret2 = 1;
|
|
|
|
#define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg))
|
|
|
|
@@ -153,7 +160,15 @@ ip_packet_match(const struct iphdr *ip,
|
|
& ((const unsigned long *)ipinfo->iniface_mask)[i];
|
|
}
|
|
|
|
- if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ for (i = 0, ret2 = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
|
|
+ ret2 |= (((const unsigned long *)physindev)[i]
|
|
+ ^ ((const unsigned long *)ipinfo->iniface)[i])
|
|
+ & ((const unsigned long *)ipinfo->iniface_mask)[i];
|
|
+ }
|
|
+#endif
|
|
+
|
|
+ if (FWINV(ret != 0 && ret2 != 0, IPT_INV_VIA_IN)) {
|
|
dprintf("VIA in mismatch (%s vs %s).%s\n",
|
|
indev, ipinfo->iniface,
|
|
ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":"");
|
|
@@ -166,7 +181,15 @@ ip_packet_match(const struct iphdr *ip,
|
|
& ((const unsigned long *)ipinfo->outiface_mask)[i];
|
|
}
|
|
|
|
- if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ for (i = 0, ret2 = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
|
|
+ ret2 |= (((const unsigned long *)physoutdev)[i]
|
|
+ ^ ((const unsigned long *)ipinfo->outiface)[i])
|
|
+ & ((const unsigned long *)ipinfo->outiface_mask)[i];
|
|
+ }
|
|
+#endif
|
|
+
|
|
+ if (FWINV(ret != 0 && ret2 != 0, IPT_INV_VIA_OUT)) {
|
|
dprintf("VIA out mismatch (%s vs %s).%s\n",
|
|
outdev, ipinfo->outiface,
|
|
ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":"");
|
|
@@ -265,6 +288,9 @@ ipt_do_table(struct sk_buff **pskb,
|
|
/* Initializing verdict to NF_DROP keeps gcc happy. */
|
|
unsigned int verdict = NF_DROP;
|
|
const char *indev, *outdev;
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ const char *physindev, *physoutdev;
|
|
+#endif
|
|
void *table_base;
|
|
struct ipt_entry *e, *back;
|
|
|
|
@@ -274,6 +300,13 @@ ipt_do_table(struct sk_buff **pskb,
|
|
datalen = (*pskb)->len - ip->ihl * 4;
|
|
indev = in ? in->name : nulldevname;
|
|
outdev = out ? out->name : nulldevname;
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ physindev = ((*pskb)->nf_bridge && (*pskb)->nf_bridge->physindev) ?
|
|
+ (*pskb)->nf_bridge->physindev->name : nulldevname;
|
|
+ physoutdev = ((*pskb)->nf_bridge && (*pskb)->nf_bridge->physoutdev) ?
|
|
+ (*pskb)->nf_bridge->physoutdev->name : nulldevname;
|
|
+#endif
|
|
+
|
|
/* We handle fragments by dealing with the first fragment as
|
|
* if it was a normal packet. All other fragments are treated
|
|
* normally, except that they will NEVER match rules that ask
|
|
@@ -309,7 +342,15 @@ ipt_do_table(struct sk_buff **pskb,
|
|
IP_NF_ASSERT(e);
|
|
IP_NF_ASSERT(back);
|
|
(*pskb)->nfcache |= e->nfcache;
|
|
- if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) {
|
|
+ if (ip_packet_match(ip, indev,
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ physindev,
|
|
+#endif
|
|
+ outdev,
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ physoutdev,
|
|
+#endif
|
|
+ &e->ip, offset)) {
|
|
struct ipt_entry_target *t;
|
|
|
|
if (IPT_MATCH_ITERATE(e, do_match,
|
|
--- linux-2.4.29/net/ipv4/ip_output.c 2005-01-19 15:10:13.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/ipv4/ip_output.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -890,6 +890,10 @@ int ip_fragment(struct sk_buff *skb, int
|
|
/* Connection association is same as pre-frag packet */
|
|
skb2->nfct = skb->nfct;
|
|
nf_conntrack_get(skb2->nfct);
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ skb2->nf_bridge = skb->nf_bridge;
|
|
+ nf_bridge_get(skb2->nf_bridge);
|
|
+#endif
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
skb2->nf_debug = skb->nf_debug;
|
|
#endif
|
|
--- linux-2.4.29/net/ipv4/netfilter/ipt_LOG.c 2003-11-28 19:26:21.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/ipt_LOG.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -316,6 +316,18 @@ ipt_log_target(struct sk_buff **pskb,
|
|
loginfo->prefix,
|
|
in ? in->name : "",
|
|
out ? out->name : "");
|
|
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
+ if ((*pskb)->nf_bridge) {
|
|
+ struct net_device *physindev = (*pskb)->nf_bridge->physindev;
|
|
+ struct net_device *physoutdev = (*pskb)->nf_bridge->physoutdev;
|
|
+
|
|
+ if (physindev && in != physindev)
|
|
+ printk("PHYSIN=%s ", physindev->name);
|
|
+ if (physoutdev && out != physoutdev)
|
|
+ printk("PHYSOUT=%s ", physoutdev->name);
|
|
+ }
|
|
+#endif
|
|
+
|
|
if (in && !out) {
|
|
/* MAC logging for input chain only. */
|
|
printk("MAC=");
|
|
--- linux-2.4.29/net/ipv4/netfilter/Makefile 2003-08-25 13:44:44.000000000 +0200
|
|
+++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/Makefile 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -87,6 +87,8 @@ obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += i
|
|
obj-$(CONFIG_IP_NF_MATCH_UNCLEAN) += ipt_unclean.o
|
|
obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
|
|
|
|
+obj-$(CONFIG_IP_NF_MATCH_PHYSDEV) += ipt_physdev.o
|
|
+
|
|
# targets
|
|
obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
|
|
obj-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o
|
|
--- linux-2.4.29/net/ipv4/netfilter/Config.in 2005-01-19 15:10:13.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/Config.in 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -44,6 +44,9 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ];
|
|
dep_tristate ' Unclean match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_UNCLEAN $CONFIG_IP_NF_IPTABLES
|
|
dep_tristate ' Owner match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_OWNER $CONFIG_IP_NF_IPTABLES
|
|
fi
|
|
+ if [ "$CONFIG_BRIDGE" != "n" ]; then
|
|
+ dep_tristate ' Physdev match support' CONFIG_IP_NF_MATCH_PHYSDEV $CONFIG_IP_NF_IPTABLES
|
|
+ fi
|
|
# The targets
|
|
dep_tristate ' Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES
|
|
if [ "$CONFIG_IP_NF_FILTER" != "n" ]; then
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/bridge/br_netfilter.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,1101 @@
|
|
+/*
|
|
+ * Handle firewalling
|
|
+ * Linux ethernet bridge
|
|
+ *
|
|
+ * Authors:
|
|
+ * Lennert Buytenhek <buytenh@gnu.org>
|
|
+ * Bart De Schuymer (maintainer) <bdschuym@pandora.be>
|
|
+ *
|
|
+ * Changes:
|
|
+ * Apr 29 2003: physdev module support (bdschuym)
|
|
+ * Jun 19 2003: let arptables see bridged ARP traffic (bdschuym)
|
|
+ * Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge
|
|
+ * (bdschuym)
|
|
+ * Aug 28 2004: add IPv6 filtering (bdschuym)
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or
|
|
+ * modify it under the terms of the GNU General Public License
|
|
+ * as published by the Free Software Foundation; either version
|
|
+ * 2 of the License, or (at your option) any later version.
|
|
+ *
|
|
+ * Lennert dedicates this file to Kerstin Wurdinger.
|
|
+ */
|
|
+
|
|
+#include <linux/module.h>
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/ip.h>
|
|
+#include <linux/netdevice.h>
|
|
+#include <linux/skbuff.h>
|
|
+#include <linux/if_ether.h>
|
|
+#include <linux/if_vlan.h>
|
|
+#include <linux/netfilter_bridge.h>
|
|
+#include <linux/netfilter_ipv4.h>
|
|
+#include <linux/netfilter_ipv6.h>
|
|
+#include <linux/in_route.h>
|
|
+#include <net/ip.h>
|
|
+#include <net/ipv6.h>
|
|
+#include <asm/uaccess.h>
|
|
+#include <asm/checksum.h>
|
|
+#include "br_private.h"
|
|
+#ifdef CONFIG_SYSCTL
|
|
+#include <linux/sysctl.h>
|
|
+#endif
|
|
+
|
|
+#define skb_origaddr(skb) (((struct bridge_skb_cb *) \
|
|
+ (skb->nf_bridge->data))->daddr.ipv4)
|
|
+#define store_orig_dstaddr(skb) (skb_origaddr(skb) = (skb)->nh.iph->daddr)
|
|
+#define dnat_took_place(skb) (skb_origaddr(skb) != (skb)->nh.iph->daddr)
|
|
+
|
|
+#define has_bridge_parent(device) ((device)->br_port != NULL)
|
|
+#define bridge_parent(device) (&((device)->br_port->br->dev))
|
|
+
|
|
+#ifdef CONFIG_SYSCTL
|
|
+static struct ctl_table_header *brnf_sysctl_header;
|
|
+static int brnf_call_iptables = 1;
|
|
+static int brnf_call_ip6tables = 1;
|
|
+static int brnf_call_arptables = 1;
|
|
+static int brnf_filter_vlan_tagged = 1;
|
|
+#else
|
|
+#define brnf_filter_vlan_tagged 1
|
|
+#endif
|
|
+
|
|
+#define IS_VLAN_IP (skb->protocol == __constant_htons(ETH_P_8021Q) && \
|
|
+ hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IP) && \
|
|
+ brnf_filter_vlan_tagged)
|
|
+#define IS_VLAN_IPV6 (skb->protocol == __constant_htons(ETH_P_8021Q) && \
|
|
+ hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IPV6) && \
|
|
+ brnf_filter_vlan_tagged)
|
|
+/*
|
|
+#define IS_VLAN_ARP (skb->protocol == __constant_htons(ETH_P_8021Q) && \
|
|
+ hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_ARP) && \
|
|
+ brnf_filter_vlan_tagged)
|
|
+*/
|
|
+
|
|
+/* We need these fake structures to make netfilter happy --
|
|
+ * lots of places assume that skb->dst != NULL, which isn't
|
|
+ * all that unreasonable.
|
|
+ *
|
|
+ * Currently, we fill in the PMTU entry because netfilter
|
|
+ * refragmentation needs it, and the rt_flags entry because
|
|
+ * ipt_REJECT needs it. Future netfilter modules might
|
|
+ * require us to fill additional fields.
|
|
+ */
|
|
+static struct net_device __fake_net_device = {
|
|
+ .hard_header_len = ETH_HLEN
|
|
+};
|
|
+
|
|
+static struct rtable __fake_rtable = {
|
|
+ u: {
|
|
+ dst: {
|
|
+ __refcnt: ATOMIC_INIT(1),
|
|
+ dev: &__fake_net_device,
|
|
+ pmtu: 1500
|
|
+ }
|
|
+ },
|
|
+
|
|
+ rt_flags: 0
|
|
+};
|
|
+
|
|
+
|
|
+/* PF_BRIDGE/PRE_ROUTING *********************************************/
|
|
+/* Undo the changes made for ip6tables PREROUTING and continue the
|
|
+ * bridge PRE_ROUTING hook. */
|
|
+static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
|
|
+{
|
|
+ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug ^= (1 << NF_BR_PRE_ROUTING);
|
|
+#endif
|
|
+
|
|
+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
|
|
+ skb->pkt_type = PACKET_OTHERHOST;
|
|
+ nf_bridge->mask ^= BRNF_PKT_TYPE;
|
|
+ }
|
|
+ nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
|
|
+
|
|
+ skb->dst = (struct dst_entry *)&__fake_rtable;
|
|
+ dst_hold(skb->dst);
|
|
+
|
|
+ skb->dev = nf_bridge->physindev;
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_push(skb, VLAN_HLEN);
|
|
+ skb->nh.raw -= VLAN_HLEN;
|
|
+ }
|
|
+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
|
|
+ br_handle_frame_finish, 1);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static void __br_dnat_complain(void)
|
|
+{
|
|
+ static unsigned long last_complaint;
|
|
+
|
|
+ if (jiffies - last_complaint >= 5 * HZ) {
|
|
+ printk(KERN_WARNING "Performing cross-bridge DNAT requires IP "
|
|
+ "forwarding to be enabled\n");
|
|
+ last_complaint = jiffies;
|
|
+ }
|
|
+}
|
|
+
|
|
+
|
|
+/* This requires some explaining. If DNAT has taken place,
|
|
+ * we will need to fix up the destination Ethernet address,
|
|
+ * and this is a tricky process.
|
|
+ *
|
|
+ * There are two cases to consider:
|
|
+ * 1. The packet was DNAT'ed to a device in the same bridge
|
|
+ * port group as it was received on. We can still bridge
|
|
+ * the packet.
|
|
+ * 2. The packet was DNAT'ed to a different device, either
|
|
+ * a non-bridged device or another bridge port group.
|
|
+ * The packet will need to be routed.
|
|
+ *
|
|
+ * The correct way of distinguishing between these two cases is to
|
|
+ * call ip_route_input() and to look at skb->dst->dev, which is
|
|
+ * changed to the destination device if ip_route_input() succeeds.
|
|
+ *
|
|
+ * Let us first consider the case that ip_route_input() succeeds:
|
|
+ *
|
|
+ * If skb->dst->dev equals the logical bridge device the packet
|
|
+ * came in on, we can consider this bridging. We then call
|
|
+ * skb->dst->output() which will make the packet enter br_nf_local_out()
|
|
+ * not much later. In that function it is assured that the iptables
|
|
+ * FORWARD chain is traversed for the packet.
|
|
+ *
|
|
+ * Otherwise, the packet is considered to be routed and we just
|
|
+ * change the destination MAC address so that the packet will
|
|
+ * later be passed up to the IP stack to be routed.
|
|
+ *
|
|
+ * Let us now consider the case that ip_route_input() fails:
|
|
+ *
|
|
+ * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input()
|
|
+ * will fail, while __ip_route_output_key() will return success. The source
|
|
+ * address for __ip_route_output_key() is set to zero, so __ip_route_output_key
|
|
+ * thinks we're handling a locally generated packet and won't care
|
|
+ * if IP forwarding is allowed. We send a warning message to the users's
|
|
+ * log telling her to put IP forwarding on.
|
|
+ *
|
|
+ * ip_route_input() will also fail if there is no route available.
|
|
+ * In that case we just drop the packet.
|
|
+ *
|
|
+ * --Lennert, 20020411
|
|
+ * --Bart, 20020416 (updated)
|
|
+ * --Bart, 20021007 (updated)
|
|
+ */
|
|
+
|
|
+static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
|
|
+{
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug |= (1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_FORWARD);
|
|
+#endif
|
|
+
|
|
+ if (skb->pkt_type == PACKET_OTHERHOST) {
|
|
+ skb->pkt_type = PACKET_HOST;
|
|
+ skb->nf_bridge->mask |= BRNF_PKT_TYPE;
|
|
+ }
|
|
+ skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
|
|
+
|
|
+ skb->dev = bridge_parent(skb->dev);
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_pull(skb, VLAN_HLEN);
|
|
+ skb->nh.raw += VLAN_HLEN;
|
|
+ }
|
|
+ skb->dst->output(skb);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int br_nf_pre_routing_finish(struct sk_buff *skb)
|
|
+{
|
|
+ struct net_device *dev = skb->dev;
|
|
+ struct iphdr *iph = skb->nh.iph;
|
|
+ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug ^= (1 << NF_BR_PRE_ROUTING);
|
|
+#endif
|
|
+
|
|
+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
|
|
+ skb->pkt_type = PACKET_OTHERHOST;
|
|
+ nf_bridge->mask ^= BRNF_PKT_TYPE;
|
|
+ }
|
|
+ nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
|
|
+
|
|
+ if (dnat_took_place(skb)) {
|
|
+ if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
|
|
+ dev)) {
|
|
+ struct rtable *rt;
|
|
+
|
|
+ if (!ip_route_output(&rt, iph->daddr, 0, iph->tos, 0)) {
|
|
+ /* Bridged-and-DNAT'ed traffic doesn't
|
|
+ * require ip_forwarding.
|
|
+ */
|
|
+ if (((struct dst_entry *)rt)->dev == dev) {
|
|
+ skb->dst = (struct dst_entry *)rt;
|
|
+ goto bridged_dnat;
|
|
+ }
|
|
+ __br_dnat_complain();
|
|
+ dst_release((struct dst_entry *)rt);
|
|
+ }
|
|
+ kfree_skb(skb);
|
|
+ return 0;
|
|
+ } else {
|
|
+ if (skb->dst->dev == dev) {
|
|
+bridged_dnat:
|
|
+ /* Tell br_nf_local_out this is a
|
|
+ * bridged frame
|
|
+ */
|
|
+ nf_bridge->mask |= BRNF_BRIDGED_DNAT;
|
|
+ skb->dev = nf_bridge->physindev;
|
|
+ if (skb->protocol ==
|
|
+ __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_push(skb, VLAN_HLEN);
|
|
+ skb->nh.raw -= VLAN_HLEN;
|
|
+ }
|
|
+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,
|
|
+ skb, skb->dev, NULL,
|
|
+ br_nf_pre_routing_finish_bridge,
|
|
+ 1);
|
|
+ return 0;
|
|
+ }
|
|
+ memcpy(skb->mac.ethernet->h_dest, dev->dev_addr,
|
|
+ ETH_ALEN);
|
|
+ skb->pkt_type = PACKET_HOST;
|
|
+ }
|
|
+ } else {
|
|
+ skb->dst = (struct dst_entry *)&__fake_rtable;
|
|
+ dst_hold(skb->dst);
|
|
+ }
|
|
+
|
|
+ skb->dev = nf_bridge->physindev;
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_push(skb, VLAN_HLEN);
|
|
+ skb->nh.raw -= VLAN_HLEN;
|
|
+ }
|
|
+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
|
|
+ br_handle_frame_finish, 1);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/* Some common code for IPv4/IPv6 */
|
|
+static void setup_pre_routing(struct sk_buff *skb)
|
|
+{
|
|
+ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
|
|
+
|
|
+ if (skb->pkt_type == PACKET_OTHERHOST) {
|
|
+ skb->pkt_type = PACKET_HOST;
|
|
+ nf_bridge->mask |= BRNF_PKT_TYPE;
|
|
+ }
|
|
+
|
|
+ nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING;
|
|
+ nf_bridge->physindev = skb->dev;
|
|
+ skb->dev = bridge_parent(skb->dev);
|
|
+}
|
|
+
|
|
+/* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */
|
|
+static int check_hbh_len(struct sk_buff *skb)
|
|
+{
|
|
+ unsigned char *raw = (u8*)(skb->nh.ipv6h+1);
|
|
+ u32 pkt_len;
|
|
+ int off = raw - skb->nh.raw;
|
|
+ int len = (raw[1]+1)<<3;
|
|
+
|
|
+ if ((raw + len) - skb->data > skb_headlen(skb))
|
|
+ goto bad;
|
|
+
|
|
+ off += 2;
|
|
+ len -= 2;
|
|
+
|
|
+ while (len > 0) {
|
|
+ int optlen = raw[off+1]+2;
|
|
+
|
|
+ switch (skb->nh.raw[off]) {
|
|
+ case IPV6_TLV_PAD0:
|
|
+ optlen = 1;
|
|
+ break;
|
|
+
|
|
+ case IPV6_TLV_PADN:
|
|
+ break;
|
|
+
|
|
+ case IPV6_TLV_JUMBO:
|
|
+ if (skb->nh.raw[off+1] != 4 || (off&3) != 2)
|
|
+ goto bad;
|
|
+
|
|
+ pkt_len = ntohl(*(u32*)(skb->nh.raw+off+2));
|
|
+
|
|
+ if (pkt_len > skb->len - sizeof(struct ipv6hdr))
|
|
+ goto bad;
|
|
+ if (pkt_len + sizeof(struct ipv6hdr) < skb->len) {
|
|
+ if (__pskb_trim(skb,
|
|
+ pkt_len + sizeof(struct ipv6hdr)))
|
|
+ goto bad;
|
|
+ if (skb->ip_summed == CHECKSUM_HW)
|
|
+ skb->ip_summed = CHECKSUM_NONE;
|
|
+ }
|
|
+ break;
|
|
+ default:
|
|
+ if (optlen > len)
|
|
+ goto bad;
|
|
+ break;
|
|
+ }
|
|
+ off += optlen;
|
|
+ len -= optlen;
|
|
+ }
|
|
+ if (len == 0)
|
|
+ return 0;
|
|
+bad:
|
|
+ return -1;
|
|
+
|
|
+}
|
|
+
|
|
+/* Replicate the checks that IPv6 does on packet reception and pass the packet
|
|
+ * to ip6tables, which doesn't support NAT, so things are fairly simple. */
|
|
+static unsigned int br_nf_pre_routing_ipv6(unsigned int hook,
|
|
+ struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out, int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ struct ipv6hdr *hdr;
|
|
+ u32 pkt_len;
|
|
+ struct nf_bridge_info *nf_bridge;
|
|
+
|
|
+ if (skb->len < sizeof(struct ipv6hdr))
|
|
+ goto inhdr_error;
|
|
+
|
|
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
|
+ goto inhdr_error;
|
|
+
|
|
+ hdr = skb->nh.ipv6h;
|
|
+
|
|
+ if (hdr->version != 6)
|
|
+ goto inhdr_error;
|
|
+
|
|
+ pkt_len = ntohs(hdr->payload_len);
|
|
+
|
|
+ if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
|
|
+ if (pkt_len + sizeof(struct ipv6hdr) > skb->len)
|
|
+ goto inhdr_error;
|
|
+ if (pkt_len + sizeof(struct ipv6hdr) < skb->len) {
|
|
+ if (__pskb_trim(skb, pkt_len + sizeof(struct ipv6hdr)))
|
|
+ goto inhdr_error;
|
|
+ if (skb->ip_summed == CHECKSUM_HW)
|
|
+ skb->ip_summed = CHECKSUM_NONE;
|
|
+ }
|
|
+ }
|
|
+ if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb))
|
|
+ goto inhdr_error;
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug ^= (1 << NF_IP6_PRE_ROUTING);
|
|
+#endif
|
|
+ if ((nf_bridge = nf_bridge_alloc(skb)) == NULL)
|
|
+ return NF_DROP;
|
|
+ setup_pre_routing(skb);
|
|
+
|
|
+ NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
|
|
+ br_nf_pre_routing_finish_ipv6);
|
|
+
|
|
+ return NF_STOLEN;
|
|
+
|
|
+inhdr_error:
|
|
+ return NF_DROP;
|
|
+}
|
|
+
|
|
+/* Direct IPv6 traffic to br_nf_pre_routing_ipv6.
|
|
+ * Replicate the checks that IPv4 does on packet reception.
|
|
+ * Set skb->dev to the bridge device (i.e. parent of the
|
|
+ * receiving device) to make netfilter happy, the REDIRECT
|
|
+ * target in particular. Save the original destination IP
|
|
+ * address to be able to detect DNAT afterwards.
|
|
+ */
|
|
+static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ struct iphdr *iph;
|
|
+ __u32 len;
|
|
+ struct sk_buff *skb = *pskb;
|
|
+ struct nf_bridge_info *nf_bridge;
|
|
+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)
|
|
+ ((*pskb)->mac.ethernet);
|
|
+
|
|
+ if (skb->protocol == __constant_htons(ETH_P_IPV6) || IS_VLAN_IPV6) {
|
|
+#ifdef CONFIG_SYSCTL
|
|
+ if (!brnf_call_ip6tables)
|
|
+ return NF_ACCEPT;
|
|
+#endif
|
|
+ if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
|
|
+ goto out;
|
|
+
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_pull(skb, VLAN_HLEN);
|
|
+ (skb)->nh.raw += VLAN_HLEN;
|
|
+ }
|
|
+ return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn);
|
|
+ }
|
|
+
|
|
+#ifdef CONFIG_SYSCTL
|
|
+ if (!brnf_call_iptables)
|
|
+ return NF_ACCEPT;
|
|
+#endif
|
|
+
|
|
+ if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP)
|
|
+ return NF_ACCEPT;
|
|
+ if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
|
|
+ goto out;
|
|
+
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_pull(skb, VLAN_HLEN);
|
|
+ (skb)->nh.raw += VLAN_HLEN;
|
|
+ }
|
|
+
|
|
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
|
|
+ goto inhdr_error;
|
|
+
|
|
+ iph = skb->nh.iph;
|
|
+ if (iph->ihl < 5 || iph->version != 4)
|
|
+ goto inhdr_error;
|
|
+
|
|
+ if (!pskb_may_pull(skb, 4*iph->ihl))
|
|
+ goto inhdr_error;
|
|
+
|
|
+ iph = skb->nh.iph;
|
|
+ if (ip_fast_csum((__u8 *)iph, iph->ihl) != 0)
|
|
+ goto inhdr_error;
|
|
+
|
|
+ len = ntohs(iph->tot_len);
|
|
+ if (skb->len < len || len < 4*iph->ihl)
|
|
+ goto inhdr_error;
|
|
+
|
|
+ if (skb->len > len) {
|
|
+ __pskb_trim(skb, len);
|
|
+ if (skb->ip_summed == CHECKSUM_HW)
|
|
+ skb->ip_summed = CHECKSUM_NONE;
|
|
+ }
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug ^= (1 << NF_IP_PRE_ROUTING);
|
|
+#endif
|
|
+ if ((nf_bridge = nf_bridge_alloc(skb)) == NULL)
|
|
+ return NF_DROP;
|
|
+
|
|
+ setup_pre_routing(skb);
|
|
+ store_orig_dstaddr(skb);
|
|
+
|
|
+ NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
|
|
+ br_nf_pre_routing_finish);
|
|
+
|
|
+ return NF_STOLEN;
|
|
+
|
|
+inhdr_error:
|
|
+// IP_INC_STATS_BH(IpInHdrErrors);
|
|
+out:
|
|
+ return NF_DROP;
|
|
+}
|
|
+
|
|
+
|
|
+/* PF_BRIDGE/LOCAL_IN ************************************************/
|
|
+/* The packet is locally destined, which requires a real
|
|
+ * dst_entry, so detach the fake one. On the way up, the
|
|
+ * packet would pass through PRE_ROUTING again (which already
|
|
+ * took place when the packet entered the bridge), but we
|
|
+ * register an IPv4 PRE_ROUTING 'sabotage' hook that will
|
|
+ * prevent this from happening.
|
|
+ */
|
|
+static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ struct sk_buff *skb = *pskb;
|
|
+
|
|
+ if (skb->dst == (struct dst_entry *)&__fake_rtable) {
|
|
+ dst_release(skb->dst);
|
|
+ skb->dst = NULL;
|
|
+ }
|
|
+
|
|
+ return NF_ACCEPT;
|
|
+}
|
|
+
|
|
+/* PF_BRIDGE/FORWARD *************************************************/
|
|
+static int br_nf_forward_finish(struct sk_buff *skb)
|
|
+{
|
|
+ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
|
|
+ struct net_device *in;
|
|
+/* struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);*/
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug ^= (1 << NF_BR_FORWARD);
|
|
+#endif
|
|
+
|
|
+/* if (skb->protocol != __constant_htons(ETH_P_ARP) && !IS_VLAN_ARP) {*/
|
|
+ in = nf_bridge->physindev;
|
|
+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
|
|
+ skb->pkt_type = PACKET_OTHERHOST;
|
|
+ nf_bridge->mask ^= BRNF_PKT_TYPE;
|
|
+ }
|
|
+/* } else {
|
|
+ in = *((struct net_device **)(skb->cb));
|
|
+ }*/
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_push(skb, VLAN_HLEN);
|
|
+ skb->nh.raw -= VLAN_HLEN;
|
|
+ }
|
|
+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in,
|
|
+ skb->dev, br_forward_finish, 1);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/* This is the 'purely bridged' case. For IP, we pass the packet to
|
|
+ * netfilter with indev and outdev set to the bridge device,
|
|
+ * but we are still able to filter on the 'real' indev/outdev
|
|
+ * because of the ipt_physdev.c module. For ARP, indev and outdev are the
|
|
+ * bridge ports.
|
|
+ */
|
|
+static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ struct sk_buff *skb = *pskb;
|
|
+ struct nf_bridge_info *nf_bridge;
|
|
+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
|
|
+ int pf;
|
|
+
|
|
+ if (!skb->nf_bridge)
|
|
+ return NF_ACCEPT;
|
|
+
|
|
+ if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP)
|
|
+ pf = PF_INET;
|
|
+ else
|
|
+ pf = PF_INET6;
|
|
+
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_pull(*pskb, VLAN_HLEN);
|
|
+ (*pskb)->nh.raw += VLAN_HLEN;
|
|
+ }
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug ^= (1 << NF_BR_FORWARD);
|
|
+#endif
|
|
+ nf_bridge = skb->nf_bridge;
|
|
+ if (skb->pkt_type == PACKET_OTHERHOST) {
|
|
+ skb->pkt_type = PACKET_HOST;
|
|
+ nf_bridge->mask |= BRNF_PKT_TYPE;
|
|
+ }
|
|
+
|
|
+ /* The physdev module checks on this */
|
|
+ nf_bridge->mask |= BRNF_BRIDGED;
|
|
+ nf_bridge->physoutdev = skb->dev;
|
|
+
|
|
+ NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in),
|
|
+ bridge_parent(out), br_nf_forward_finish);
|
|
+
|
|
+ return NF_STOLEN;
|
|
+}
|
|
+
|
|
+/*
|
|
+static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ struct sk_buff *skb = *pskb;
|
|
+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
|
|
+ struct net_device **d = (struct net_device **)(skb->cb);
|
|
+
|
|
+ if (!brnf_call_arptables)
|
|
+ return NF_ACCEPT;
|
|
+
|
|
+ if (skb->protocol != __constant_htons(ETH_P_ARP)) {
|
|
+ if (!IS_VLAN_ARP)
|
|
+ return NF_ACCEPT;
|
|
+ skb_pull(*pskb, VLAN_HLEN);
|
|
+ (*pskb)->nh.raw += VLAN_HLEN;
|
|
+ }
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug ^= (1 << NF_BR_FORWARD);
|
|
+#endif
|
|
+
|
|
+ if (skb->nh.arph->ar_pln != 4) {
|
|
+ if (IS_VLAN_ARP) {
|
|
+ skb_push(*pskb, VLAN_HLEN);
|
|
+ (*pskb)->nh.raw -= VLAN_HLEN;
|
|
+ }
|
|
+ return NF_ACCEPT;
|
|
+ }
|
|
+ *d = (struct net_device *)in;
|
|
+ NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in,
|
|
+ (struct net_device *)out, br_nf_forward_finish);
|
|
+
|
|
+ return NF_STOLEN;
|
|
+}
|
|
+*/
|
|
+
|
|
+/* PF_BRIDGE/LOCAL_OUT ***********************************************/
|
|
+static int br_nf_local_out_finish(struct sk_buff *skb)
|
|
+{
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug &= ~(1 << NF_BR_LOCAL_OUT);
|
|
+#endif
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_push(skb, VLAN_HLEN);
|
|
+ skb->nh.raw -= VLAN_HLEN;
|
|
+ }
|
|
+
|
|
+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
|
|
+ br_forward_finish, NF_BR_PRI_FIRST + 1);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
+/* This function sees both locally originated IP packets and forwarded
|
|
+ * IP packets (in both cases the destination device is a bridge
|
|
+ * device). It also sees bridged-and-DNAT'ed packets.
|
|
+ * To be able to filter on the physical bridge devices (with the ipt_physdev.c
|
|
+ * module), we steal packets destined to a bridge device away from the
|
|
+ * PF_INET/FORWARD and PF_INET/OUTPUT hook functions, and give them back later,
|
|
+ * when we have determined the real output device. This is done in here.
|
|
+ *
|
|
+ * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged
|
|
+ * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward()
|
|
+ * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority
|
|
+ * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor
|
|
+ * will be executed.
|
|
+ * Otherwise, if nf_bridge->physindev is NULL, the bridge-nf code never touched
|
|
+ * this packet before, and so the packet was locally originated. We fake
|
|
+ * the PF_INET/LOCAL_OUT hook.
|
|
+ * Finally, if nf_bridge->physindev isn't NULL, then the packet was IP routed,
|
|
+ * so we fake the PF_INET/FORWARD hook. ipv4_sabotage_out() makes sure
|
|
+ * even routed packets that didn't arrive on a bridge interface have their
|
|
+ * nf_bridge->physindev set.
|
|
+ */
|
|
+
|
|
+static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ struct net_device *realindev, *realoutdev;
|
|
+ struct sk_buff *skb = *pskb;
|
|
+ struct nf_bridge_info *nf_bridge;
|
|
+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
|
|
+ int pf;
|
|
+
|
|
+ if (!skb->nf_bridge)
|
|
+ return NF_ACCEPT;
|
|
+
|
|
+ if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP)
|
|
+ pf = PF_INET;
|
|
+ else
|
|
+ pf = PF_INET6;
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ /* Sometimes we get packets with NULL ->dst here (for example,
|
|
+ * running a dhcp client daemon triggers this). This should now
|
|
+ * be fixed, but let's keep the check around. */
|
|
+ if (skb->dst == NULL) {
|
|
+ printk(KERN_CRIT "br_netfilter: skb->dst == NULL.");
|
|
+ return NF_ACCEPT;
|
|
+ }
|
|
+#endif
|
|
+
|
|
+ nf_bridge = skb->nf_bridge;
|
|
+ nf_bridge->physoutdev = skb->dev;
|
|
+ realindev = nf_bridge->physindev;
|
|
+
|
|
+ /* Bridged, take PF_BRIDGE/FORWARD.
|
|
+ * (see big note in front of br_nf_pre_routing_finish)
|
|
+ */
|
|
+ if (nf_bridge->mask & BRNF_BRIDGED_DNAT) {
|
|
+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
|
|
+ skb->pkt_type = PACKET_OTHERHOST;
|
|
+ nf_bridge->mask ^= BRNF_PKT_TYPE;
|
|
+ }
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_push(skb, VLAN_HLEN);
|
|
+ skb->nh.raw -= VLAN_HLEN;
|
|
+ }
|
|
+
|
|
+ NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev,
|
|
+ skb->dev, br_forward_finish);
|
|
+ goto out;
|
|
+ }
|
|
+ realoutdev = bridge_parent(skb->dev);
|
|
+
|
|
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
|
|
+ /* iptables should match -o br0.x */
|
|
+ if (nf_bridge->netoutdev)
|
|
+ realoutdev = nf_bridge->netoutdev;
|
|
+#endif
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_pull(skb, VLAN_HLEN);
|
|
+ (*pskb)->nh.raw += VLAN_HLEN;
|
|
+ }
|
|
+ /* IP forwarded traffic has a physindev, locally
|
|
+ * generated traffic hasn't.
|
|
+ */
|
|
+ if (realindev != NULL) {
|
|
+ if (((nf_bridge->mask & BRNF_DONT_TAKE_PARENT) == 0) &&
|
|
+ has_bridge_parent(realindev))
|
|
+ realindev = bridge_parent(realindev);
|
|
+ NF_HOOK_THRESH(pf, NF_IP_FORWARD, skb, realindev,
|
|
+ realoutdev, okfn,
|
|
+ NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1);
|
|
+ } else {
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ skb->nf_debug ^= (1 << NF_IP_LOCAL_OUT);
|
|
+#endif
|
|
+
|
|
+ NF_HOOK_THRESH(pf, NF_IP_LOCAL_OUT, skb, realindev,
|
|
+ realoutdev, okfn,
|
|
+ NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1);
|
|
+ }
|
|
+
|
|
+out:
|
|
+ return NF_STOLEN;
|
|
+}
|
|
+
|
|
+
|
|
+/* PF_BRIDGE/POST_ROUTING ********************************************/
|
|
+static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ struct sk_buff *skb = *pskb;
|
|
+ struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge;
|
|
+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
|
|
+ struct net_device *realoutdev = bridge_parent(skb->dev);
|
|
+ int pf;
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ /* Be very paranoid. This probably won't happen anymore, but let's
|
|
+ * keep the check just to be sure... */
|
|
+ if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) {
|
|
+ printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: "
|
|
+ "bad mac.raw pointer.");
|
|
+ goto print_error;
|
|
+ }
|
|
+#endif
|
|
+
|
|
+ if (!nf_bridge)
|
|
+ return NF_ACCEPT;
|
|
+
|
|
+ if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP)
|
|
+ pf = PF_INET;
|
|
+ else
|
|
+ pf = PF_INET6;
|
|
+
|
|
+ /* Sometimes we get packets with NULL ->dst here (for example,
|
|
+ * running a dhcp client daemon triggers this).
|
|
+ */
|
|
+ if (skb->dst == NULL)
|
|
+ return NF_ACCEPT;
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+ /* Sometimes we get packets with NULL ->dst here (for example,
|
|
+ * running a dhcp client daemon triggers this). This should now
|
|
+ * be fixed, but let's keep the check around.
|
|
+ */
|
|
+ if (skb->dst == NULL) {
|
|
+ printk(KERN_CRIT "br_netfilter: skb->dst == NULL.");
|
|
+ goto print_error;
|
|
+ }
|
|
+
|
|
+ skb->nf_debug ^= (1 << NF_IP_POST_ROUTING);
|
|
+#endif
|
|
+
|
|
+ /* We assume any code from br_dev_queue_push_xmit onwards doesn't care
|
|
+ * about the value of skb->pkt_type.
|
|
+ */
|
|
+ if (skb->pkt_type == PACKET_OTHERHOST) {
|
|
+ skb->pkt_type = PACKET_HOST;
|
|
+ nf_bridge->mask |= BRNF_PKT_TYPE;
|
|
+ }
|
|
+
|
|
+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
|
|
+ skb_pull(skb, VLAN_HLEN);
|
|
+ skb->nh.raw += VLAN_HLEN;
|
|
+ }
|
|
+
|
|
+ nf_bridge_save_header(skb);
|
|
+
|
|
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
|
|
+ if (nf_bridge->netoutdev)
|
|
+ realoutdev = nf_bridge->netoutdev;
|
|
+#endif
|
|
+ NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL,
|
|
+ realoutdev, br_dev_queue_push_xmit);
|
|
+
|
|
+ return NF_STOLEN;
|
|
+
|
|
+#ifdef CONFIG_NETFILTER_DEBUG
|
|
+print_error:
|
|
+ if (skb->dev != NULL) {
|
|
+ printk("[%s]", skb->dev->name);
|
|
+ if (has_bridge_parent(skb->dev))
|
|
+ printk("[%s]", bridge_parent(skb->dev)->name);
|
|
+ }
|
|
+ printk(" head:%p, raw:%p, data:%p\n", skb->head, skb->mac.raw,
|
|
+ skb->data);
|
|
+ return NF_ACCEPT;
|
|
+#endif
|
|
+}
|
|
+
|
|
+
|
|
+/* IPv4/SABOTAGE *****************************************************/
|
|
+
|
|
+/* Don't hand locally destined packets to PF_INET/PRE_ROUTING
|
|
+ * for the second time.
|
|
+ */
|
|
+static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ if ((*pskb)->nf_bridge &&
|
|
+ !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) {
|
|
+ return NF_STOP;
|
|
+ }
|
|
+
|
|
+ return NF_ACCEPT;
|
|
+}
|
|
+
|
|
+/* Postpone execution of PF_INET/FORWARD, PF_INET/LOCAL_OUT
|
|
+ * and PF_INET/POST_ROUTING until we have done the forwarding
|
|
+ * decision in the bridge code and have determined skb->physoutdev.
|
|
+ */
|
|
+static unsigned int ip_sabotage_out(unsigned int hook, struct sk_buff **pskb,
|
|
+ const struct net_device *in, const struct net_device *out,
|
|
+ int (*okfn)(struct sk_buff *))
|
|
+{
|
|
+ struct sk_buff *skb = *pskb;
|
|
+
|
|
+ if ((out->hard_start_xmit == br_dev_xmit &&
|
|
+ okfn != br_nf_forward_finish &&
|
|
+ okfn != br_nf_local_out_finish &&
|
|
+ okfn != br_dev_queue_push_xmit)
|
|
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
|
|
+ || ((out->priv_flags & IFF_802_1Q_VLAN) &&
|
|
+ VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit)
|
|
+#endif
|
|
+ ) {
|
|
+ struct nf_bridge_info *nf_bridge;
|
|
+
|
|
+ if (!skb->nf_bridge) {
|
|
+#ifdef CONFIG_SYSCTL
|
|
+ /* This code is executed while in the IP(v6) stack,
|
|
+ the version should be 4 or 6. We can't use
|
|
+ skb->protocol because that isn't set on
|
|
+ PF_INET(6)/LOCAL_OUT. */
|
|
+ struct iphdr *ip = skb->nh.iph;
|
|
+
|
|
+ if (ip->version == 4 && !brnf_call_iptables)
|
|
+ return NF_ACCEPT;
|
|
+ else if (ip->version == 6 && !brnf_call_ip6tables)
|
|
+ return NF_ACCEPT;
|
|
+#endif
|
|
+ if (hook == NF_IP_POST_ROUTING)
|
|
+ return NF_ACCEPT;
|
|
+ if (!nf_bridge_alloc(skb))
|
|
+ return NF_DROP;
|
|
+ }
|
|
+
|
|
+ nf_bridge = skb->nf_bridge;
|
|
+
|
|
+ /* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we
|
|
+ * will need the indev then. For a brouter, the real indev
|
|
+ * can be a bridge port, so we make sure br_nf_local_out()
|
|
+ * doesn't use the bridge parent of the indev by using
|
|
+ * the BRNF_DONT_TAKE_PARENT mask.
|
|
+ */
|
|
+ if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) {
|
|
+ nf_bridge->mask &= BRNF_DONT_TAKE_PARENT;
|
|
+ nf_bridge->physindev = (struct net_device *)in;
|
|
+ }
|
|
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
|
|
+ /* the iptables outdev is br0.x, not br0 */
|
|
+ if (out->priv_flags & IFF_802_1Q_VLAN)
|
|
+ nf_bridge->netoutdev = (struct net_device *)out;
|
|
+#endif
|
|
+ return NF_STOP;
|
|
+ }
|
|
+
|
|
+ return NF_ACCEPT;
|
|
+}
|
|
+
|
|
+/* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent
|
|
+ * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input.
|
|
+ * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because
|
|
+ * ip_refrag() can return NF_STOLEN.
|
|
+ */
|
|
+static struct nf_hook_ops br_nf_ops[] = {
|
|
+ { .hook = br_nf_pre_routing,
|
|
+ .pf = PF_BRIDGE,
|
|
+ .hooknum = NF_BR_PRE_ROUTING,
|
|
+ .priority = NF_BR_PRI_BRNF, },
|
|
+ { .hook = br_nf_local_in,
|
|
+ .pf = PF_BRIDGE,
|
|
+ .hooknum = NF_BR_LOCAL_IN,
|
|
+ .priority = NF_BR_PRI_BRNF, },
|
|
+ { .hook = br_nf_forward_ip,
|
|
+ .pf = PF_BRIDGE,
|
|
+ .hooknum = NF_BR_FORWARD,
|
|
+ .priority = NF_BR_PRI_BRNF /*- 1*/, },
|
|
+/* { .hook = br_nf_forward_arp,
|
|
+ .pf = PF_BRIDGE,
|
|
+ .hooknum = NF_BR_FORWARD,
|
|
+ .priority = NF_BR_PRI_BRNF, },*/
|
|
+ { .hook = br_nf_local_out,
|
|
+ .pf = PF_BRIDGE,
|
|
+ .hooknum = NF_BR_LOCAL_OUT,
|
|
+ .priority = NF_BR_PRI_FIRST, },
|
|
+ { .hook = br_nf_post_routing,
|
|
+ .pf = PF_BRIDGE,
|
|
+ .hooknum = NF_BR_POST_ROUTING,
|
|
+ .priority = NF_BR_PRI_LAST, },
|
|
+ { .hook = ip_sabotage_in,
|
|
+ .pf = PF_INET,
|
|
+ .hooknum = NF_IP_PRE_ROUTING,
|
|
+ .priority = NF_IP_PRI_FIRST, },
|
|
+ { .hook = ip_sabotage_in,
|
|
+ .pf = PF_INET6,
|
|
+ .hooknum = NF_IP6_PRE_ROUTING,
|
|
+ .priority = NF_IP6_PRI_FIRST, },
|
|
+ { .hook = ip_sabotage_out,
|
|
+ .pf = PF_INET,
|
|
+ .hooknum = NF_IP_FORWARD,
|
|
+ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, },
|
|
+ { .hook = ip_sabotage_out,
|
|
+ .pf = PF_INET6,
|
|
+ .hooknum = NF_IP6_FORWARD,
|
|
+ .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD, },
|
|
+ { .hook = ip_sabotage_out,
|
|
+ .pf = PF_INET,
|
|
+ .hooknum = NF_IP_LOCAL_OUT,
|
|
+ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, },
|
|
+ { .hook = ip_sabotage_out,
|
|
+ .pf = PF_INET6,
|
|
+ .hooknum = NF_IP6_LOCAL_OUT,
|
|
+ .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, },
|
|
+ { .hook = ip_sabotage_out,
|
|
+ .pf = PF_INET,
|
|
+ .hooknum = NF_IP_POST_ROUTING,
|
|
+ .priority = NF_IP_PRI_FIRST, },
|
|
+ { .hook = ip_sabotage_out,
|
|
+ .pf = PF_INET6,
|
|
+ .hooknum = NF_IP6_POST_ROUTING,
|
|
+ .priority = NF_IP6_PRI_FIRST, },
|
|
+};
|
|
+
|
|
+#ifdef CONFIG_SYSCTL
|
|
+static
|
|
+int brnf_sysctl_call_tables(ctl_table *ctl, int write, struct file * filp,
|
|
+ void *buffer, size_t *lenp)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ ret = proc_dointvec(ctl, write, filp, buffer, lenp);
|
|
+
|
|
+ if (write && *(int *)(ctl->data))
|
|
+ *(int *)(ctl->data) = 1;
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static ctl_table brnf_table[] = {
|
|
+ {
|
|
+ .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES,
|
|
+ .procname = "bridge-nf-call-arptables",
|
|
+ .data = &brnf_call_arptables,
|
|
+ .maxlen = sizeof(int),
|
|
+ .mode = 0644,
|
|
+ .proc_handler = &brnf_sysctl_call_tables,
|
|
+ },
|
|
+ {
|
|
+ .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES,
|
|
+ .procname = "bridge-nf-call-iptables",
|
|
+ .data = &brnf_call_iptables,
|
|
+ .maxlen = sizeof(int),
|
|
+ .mode = 0644,
|
|
+ .proc_handler = &brnf_sysctl_call_tables,
|
|
+ },
|
|
+ {
|
|
+ .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES,
|
|
+ .procname = "bridge-nf-call-ip6tables",
|
|
+ .data = &brnf_call_ip6tables,
|
|
+ .maxlen = sizeof(int),
|
|
+ .mode = 0644,
|
|
+ .proc_handler = &brnf_sysctl_call_tables,
|
|
+ },
|
|
+ {
|
|
+ .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED,
|
|
+ .procname = "bridge-nf-filter-vlan-tagged",
|
|
+ .data = &brnf_filter_vlan_tagged,
|
|
+ .maxlen = sizeof(int),
|
|
+ .mode = 0644,
|
|
+ .proc_handler = &brnf_sysctl_call_tables,
|
|
+ },
|
|
+ { .ctl_name = 0 }
|
|
+};
|
|
+
|
|
+static ctl_table brnf_bridge_table[] = {
|
|
+ {
|
|
+ .ctl_name = NET_BRIDGE,
|
|
+ .procname = "bridge",
|
|
+ .mode = 0555,
|
|
+ .child = brnf_table,
|
|
+ },
|
|
+ { .ctl_name = 0 }
|
|
+};
|
|
+
|
|
+static ctl_table brnf_net_table[] = {
|
|
+ {
|
|
+ .ctl_name = CTL_NET,
|
|
+ .procname = "net",
|
|
+ .mode = 0555,
|
|
+ .child = brnf_bridge_table,
|
|
+ },
|
|
+ { .ctl_name = 0 }
|
|
+};
|
|
+#endif
|
|
+
|
|
+int br_netfilter_init(void)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) {
|
|
+ int ret;
|
|
+
|
|
+ if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0)
|
|
+ continue;
|
|
+
|
|
+ while (i--)
|
|
+ nf_unregister_hook(&br_nf_ops[i]);
|
|
+
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+#ifdef CONFIG_SYSCTL
|
|
+ brnf_sysctl_header = register_sysctl_table(brnf_net_table, 0);
|
|
+ if (brnf_sysctl_header == NULL) {
|
|
+ printk(KERN_WARNING "br_netfilter: can't register to sysctl.\n");
|
|
+ for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++)
|
|
+ nf_unregister_hook(&br_nf_ops[i]);
|
|
+ return -EFAULT;
|
|
+ }
|
|
+#endif
|
|
+
|
|
+ printk(KERN_NOTICE "Bridge firewalling registered\n");
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+void br_netfilter_fini(void)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--)
|
|
+ nf_unregister_hook(&br_nf_ops[i]);
|
|
+#ifdef CONFIG_SYSCTL
|
|
+ unregister_sysctl_table(brnf_sysctl_header);
|
|
+#endif
|
|
+
|
|
+}
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/ipt_physdev.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -0,0 +1,127 @@
|
|
+/* Kernel module to match the bridge port in and
|
|
+ * out device for IP packets coming into contact with a bridge. */
|
|
+#include <linux/module.h>
|
|
+#include <linux/skbuff.h>
|
|
+#include <linux/netfilter_ipv4/ipt_physdev.h>
|
|
+#include <linux/netfilter_ipv4/ip_tables.h>
|
|
+#include <linux/netfilter_bridge.h>
|
|
+#include <linux/netdevice.h>
|
|
+#define MATCH 1
|
|
+#define NOMATCH 0
|
|
+
|
|
+static int
|
|
+match(const struct sk_buff *skb,
|
|
+ const struct net_device *in,
|
|
+ const struct net_device *out,
|
|
+ const void *matchinfo,
|
|
+ int offset,
|
|
+ const void *hdr,
|
|
+ u_int16_t datalen,
|
|
+ int *hotdrop)
|
|
+{
|
|
+ int i;
|
|
+ static const char nulldevname[IFNAMSIZ] = { 0 };
|
|
+ const struct ipt_physdev_info *info = matchinfo;
|
|
+ unsigned long ret;
|
|
+ const char *indev, *outdev;
|
|
+ struct nf_bridge_info *nf_bridge;
|
|
+
|
|
+ /* Not a bridged IP packet or no info available yet:
|
|
+ * LOCAL_OUT/mangle and LOCAL_OUT/nat don't know if
|
|
+ * the destination device will be a bridge. */
|
|
+ if (!(nf_bridge = skb->nf_bridge)) {
|
|
+ /* Return MATCH if the invert flags of the used options are on */
|
|
+ if ((info->bitmask & IPT_PHYSDEV_OP_BRIDGED) &&
|
|
+ !(info->invert & IPT_PHYSDEV_OP_BRIDGED))
|
|
+ return NOMATCH;
|
|
+ if ((info->bitmask & IPT_PHYSDEV_OP_ISIN) &&
|
|
+ !(info->invert & IPT_PHYSDEV_OP_ISIN))
|
|
+ return NOMATCH;
|
|
+ if ((info->bitmask & IPT_PHYSDEV_OP_ISOUT) &&
|
|
+ !(info->invert & IPT_PHYSDEV_OP_ISOUT))
|
|
+ return NOMATCH;
|
|
+ if ((info->bitmask & IPT_PHYSDEV_OP_IN) &&
|
|
+ !(info->invert & IPT_PHYSDEV_OP_IN))
|
|
+ return NOMATCH;
|
|
+ if ((info->bitmask & IPT_PHYSDEV_OP_OUT) &&
|
|
+ !(info->invert & IPT_PHYSDEV_OP_OUT))
|
|
+ return NOMATCH;
|
|
+ return MATCH;
|
|
+ }
|
|
+
|
|
+ /* This only makes sense in the FORWARD and POSTROUTING chains */
|
|
+ if ((info->bitmask & IPT_PHYSDEV_OP_BRIDGED) &&
|
|
+ (!!(nf_bridge->mask & BRNF_BRIDGED) ^
|
|
+ !(info->invert & IPT_PHYSDEV_OP_BRIDGED)))
|
|
+ return NOMATCH;
|
|
+
|
|
+ if ((info->bitmask & IPT_PHYSDEV_OP_ISIN &&
|
|
+ (!nf_bridge->physindev ^ !!(info->invert & IPT_PHYSDEV_OP_ISIN))) ||
|
|
+ (info->bitmask & IPT_PHYSDEV_OP_ISOUT &&
|
|
+ (!nf_bridge->physoutdev ^ !!(info->invert & IPT_PHYSDEV_OP_ISOUT))))
|
|
+ return NOMATCH;
|
|
+
|
|
+ if (!(info->bitmask & IPT_PHYSDEV_OP_IN))
|
|
+ goto match_outdev;
|
|
+ indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
|
|
+ for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
|
|
+ ret |= (((const unsigned long *)indev)[i]
|
|
+ ^ ((const unsigned long *)info->physindev)[i])
|
|
+ & ((const unsigned long *)info->in_mask)[i];
|
|
+ }
|
|
+
|
|
+ if ((ret == 0) ^ !(info->invert & IPT_PHYSDEV_OP_IN))
|
|
+ return NOMATCH;
|
|
+
|
|
+match_outdev:
|
|
+ if (!(info->bitmask & IPT_PHYSDEV_OP_OUT))
|
|
+ return MATCH;
|
|
+ outdev = nf_bridge->physoutdev ?
|
|
+ nf_bridge->physoutdev->name : nulldevname;
|
|
+ for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
|
|
+ ret |= (((const unsigned long *)outdev)[i]
|
|
+ ^ ((const unsigned long *)info->physoutdev)[i])
|
|
+ & ((const unsigned long *)info->out_mask)[i];
|
|
+ }
|
|
+
|
|
+ return (ret != 0) ^ !(info->invert & IPT_PHYSDEV_OP_OUT);
|
|
+}
|
|
+
|
|
+static int
|
|
+checkentry(const char *tablename,
|
|
+ const struct ipt_ip *ip,
|
|
+ void *matchinfo,
|
|
+ unsigned int matchsize,
|
|
+ unsigned int hook_mask)
|
|
+{
|
|
+ const struct ipt_physdev_info *info = matchinfo;
|
|
+
|
|
+ if (matchsize != IPT_ALIGN(sizeof(struct ipt_physdev_info)))
|
|
+ return 0;
|
|
+ if (!(info->bitmask & IPT_PHYSDEV_OP_MASK) ||
|
|
+ info->bitmask & ~IPT_PHYSDEV_OP_MASK)
|
|
+ return 0;
|
|
+ return 1;
|
|
+}
|
|
+
|
|
+static struct ipt_match physdev_match = {
|
|
+ .name = "physdev",
|
|
+ .match = &match,
|
|
+ .checkentry = &checkentry,
|
|
+ .me = THIS_MODULE,
|
|
+};
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ return ipt_register_match(&physdev_match);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ ipt_unregister_match(&physdev_match);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
+MODULE_LICENSE("GPL");
|
|
+EXPORT_NO_SYMBOLS;
|
|
--- /dev/null 2005-03-14 20:10:29.001600248 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/netfilter_ipv4/ipt_physdev.h 2005-03-14 21:24:30.000000000 +0100
|
|
@@ -0,0 +1,24 @@
|
|
+#ifndef _IPT_PHYSDEV_H
|
|
+#define _IPT_PHYSDEV_H
|
|
+
|
|
+#ifdef __KERNEL__
|
|
+#include <linux/if.h>
|
|
+#endif
|
|
+
|
|
+#define IPT_PHYSDEV_OP_IN 0x01
|
|
+#define IPT_PHYSDEV_OP_OUT 0x02
|
|
+#define IPT_PHYSDEV_OP_BRIDGED 0x04
|
|
+#define IPT_PHYSDEV_OP_ISIN 0x08
|
|
+#define IPT_PHYSDEV_OP_ISOUT 0x10
|
|
+#define IPT_PHYSDEV_OP_MASK (0x20 - 1)
|
|
+
|
|
+struct ipt_physdev_info {
|
|
+ char physindev[IFNAMSIZ];
|
|
+ char in_mask[IFNAMSIZ];
|
|
+ char physoutdev[IFNAMSIZ];
|
|
+ char out_mask[IFNAMSIZ];
|
|
+ u_int8_t invert;
|
|
+ u_int8_t bitmask;
|
|
+};
|
|
+
|
|
+#endif /*_IPT_PHYSDEV_H*/
|
|
--- linux-2.4.29/net/8021q/vlan_dev.c 2005-01-19 15:10:13.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/8021q/vlan_dev.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -488,6 +488,10 @@ int vlan_dev_hard_start_xmit(struct sk_b
|
|
stats->tx_packets++; /* for statics only */
|
|
stats->tx_bytes += skb->len;
|
|
|
|
+ skb->protocol = __constant_htons(ETH_P_8021Q);
|
|
+ skb->mac.raw -= VLAN_HLEN;
|
|
+ skb->nh.raw -= VLAN_HLEN;
|
|
+
|
|
skb->dev = VLAN_DEV_INFO(dev)->real_dev;
|
|
dev_queue_xmit(skb);
|
|
|
|
--- linux-2.4.29/include/linux/sysctl.h 2005-01-19 15:10:13.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/include/linux/sysctl.h 2005-03-14 21:07:18.000000000 +0100
|
|
@@ -608,6 +608,15 @@ enum {
|
|
NET_DECNET_CONF_DEV_STATE = 7
|
|
};
|
|
|
|
+/* /proc/sys/net/bridge */
|
|
+enum {
|
|
+ NET_BRIDGE_NF_CALL_ARPTABLES = 1,
|
|
+ NET_BRIDGE_NF_CALL_IPTABLES = 2,
|
|
+ NET_BRIDGE_NF_CALL_IP6TABLES = 3,
|
|
+ NET_BRIDGE_NF_FILTER_VLAN_TAGGED = 4,
|
|
+};
|
|
+
|
|
+
|
|
/* CTL_PROC names: */
|
|
|
|
/* CTL_FS names: */
|
|
--- linux-2.4.29/net/ipv4/netfilter/ipt_REJECT.c 2005-01-19 15:10:13.000000000 +0100
|
|
+++ linux-2.4.29-ebt-brnf/net/ipv4/netfilter/ipt_REJECT.c 2005-03-14 00:00:30.000000000 +0100
|
|
@@ -15,6 +15,9 @@
|
|
#include <net/route.h>
|
|
#include <linux/netfilter_ipv4/ip_tables.h>
|
|
#include <linux/netfilter_ipv4/ipt_REJECT.h>
|
|
+#ifdef CONFIG_BRIDGE_NETFILTER
|
|
+#include <linux/netfilter_bridge.h>
|
|
+#endif
|
|
|
|
#if 0
|
|
#define DEBUGP printk
|
|
@@ -29,7 +32,13 @@ static inline struct rtable *route_rever
|
|
struct rt_key key = {};
|
|
struct rtable *rt;
|
|
|
|
- if (hook != NF_IP_FORWARD) {
|
|
+ /* We don't require ip forwarding to be enabled to be able to
|
|
+ * send a RST reply for bridged traffic. */
|
|
+ if (hook != NF_IP_FORWARD
|
|
+#ifdef CONFIG_BRIDGE_NETFILTER
|
|
+ || (skb->nf_bridge && skb->nf_bridge->mask & BRNF_BRIDGED)
|
|
+#endif
|
|
+ ) {
|
|
key.dst = iph->saddr;
|
|
if (hook == NF_IP_LOCAL_IN)
|
|
key.src = iph->daddr;
|