mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-05 17:16:15 +02:00
7ed77935ac
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@166 3c298f89-4303-0410-b956-a3cf2f4a3e73
5553 lines
157 KiB
Diff
5553 lines
157 KiB
Diff
--- linux-2.4.21/net/bridge/br_private.h Mon Feb 25 20:38:14 2002
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+++ linux-2.4.21-ebt-brnf-3/net/bridge/br_private.h Fri Aug 8 01:09:06 2003
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@@ -144,8 +144,10 @@ 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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@@ -166,7 +168,8 @@ 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 void br_call_ioctl_atomic(void (*fn)(void));
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@@ -176,6 +179,10 @@ extern int br_ioctl(struct net_bridge *b
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unsigned long arg1,
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unsigned long arg2);
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extern int br_ioctl_deviceless_stub(unsigned long arg);
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+
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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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/* br_stp.c */
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extern int br_is_root_bridge(struct net_bridge *br);
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--- linux-2.4.21/include/linux/if_bridge.h Thu Nov 22 20:47:12 2001
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+++ linux-2.4.21-ebt-brnf-3/include/linux/if_bridge.h Fri Aug 8 01:09:06 2003
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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-2.4.21/net/core/dev.c Fri Jun 13 16:51:39 2003
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+++ linux-2.4.21-ebt-brnf-3/net/core/dev.c Fri Aug 8 01:10:03 2003
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@@ -1424,7 +1424,7 @@ 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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@@ -1441,7 +1441,6 @@ 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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@@ -1497,11 +1496,16 @@ int netif_receive_skb(struct sk_buff *sk
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if (skb->dev->divert && skb->dev->divert->divert)
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ret = handle_diverter(skb);
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#endif /* CONFIG_NET_DIVERT */
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-
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+
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#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
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if (skb->dev->br_port != NULL &&
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- br_handle_frame_hook != NULL) {
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- return handle_bridge(skb, pt_prev);
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+ br_handle_frame_hook != NULL) {
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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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@@ -1897,7 +1901,7 @@ static int dev_proc_stats(char *buffer,
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* are adjusted, %RTM_NEWLINK is sent to the routing socket and the
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* function returns zero.
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*/
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-
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+
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int netdev_set_master(struct net_device *slave, struct net_device *master)
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{
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struct net_device *old = slave->master;
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--- linux-2.4.21/net/bridge/br_input.c Sat Aug 3 02:39:46 2002
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+++ linux-2.4.21-ebt-brnf-3/net/bridge/br_input.c Fri Aug 8 01:09:06 2003
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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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@@ -146,25 +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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+
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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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br_stp_handle_bpdu(skb);
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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-2.4.21/net/bridge/br_forward.c Sat Aug 3 02:39:46 2002
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+++ linux-2.4.21-ebt-brnf-3/net/bridge/br_forward.c Fri Aug 8 01:09:06 2003
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@@ -30,18 +30,22 @@ 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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+ if (skb->nf_bridge)
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+ memcpy(skb->data - 16, skb->nf_bridge->hh, 16);
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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 +53,11 @@ 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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@@ -61,7 +68,7 @@ static void __br_forward(struct net_brid
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skb->dev = to->dev;
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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-2.4.21/net/bridge/br.c Fri Nov 29 00:53:15 2002
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+++ linux-2.4.21-ebt-brnf-3/net/bridge/br.c Fri Aug 8 01:09:06 2003
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@@ -29,6 +29,8 @@
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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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@@ -43,6 +45,10 @@ 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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@@ -61,6 +67,9 @@ static void __br_clear_ioctl_hook(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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br_call_ioctl_atomic(__br_clear_ioctl_hook);
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@@ -74,7 +83,7 @@ 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-2.4.21/net/bridge/Makefile Fri Dec 29 23:07:24 2000
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+++ linux-2.4.21-ebt-brnf-3/net/bridge/Makefile Fri Aug 8 01:09:06 2003
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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-2.4.21/include/linux/netfilter_bridge.h Tue Jun 12 04:15:27 2001
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+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge.h Fri Aug 8 01:09:06 2003
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@@ -1,11 +1,14 @@
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#ifndef __LINUX_BRIDGE_NETFILTER_H
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#define __LINUX_BRIDGE_NETFILTER_H
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|
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-/* bridge-specific defines for netfilter.
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+/* bridge-specific defines for netfilter.
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*/
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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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+#endif
|
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|
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/* Bridge Hooks */
|
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/* After promisc drops, checksum checks. */
|
||
@@ -18,7 +21,49 @@
|
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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
|
||
|
||
+#ifdef __KERNEL__
|
||
|
||
+#define BRNF_PKT_TYPE 0x01
|
||
+#define BRNF_BRIDGED_DNAT 0x02
|
||
+#define BRNF_DONT_TAKE_PARENT 0x04
|
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+#define BRNF_BRIDGED 0x08
|
||
+
|
||
+enum nf_br_hook_priorities {
|
||
+ NF_BR_PRI_FIRST = INT_MIN,
|
||
+ 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,
|
||
+ NF_BR_PRI_NAT_DST_OTHER = 100,
|
||
+ NF_BR_PRI_FILTER_OTHER = 200,
|
||
+ NF_BR_PRI_NAT_SRC = 300,
|
||
+ NF_BR_PRI_LAST = INT_MAX,
|
||
+};
|
||
+
|
||
+#ifdef CONFIG_NETFILTER
|
||
+static inline
|
||
+struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
|
||
+{
|
||
+ struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
|
||
+
|
||
+ if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
|
||
+ atomic_set(&(*nf_bridge)->use, 1);
|
||
+ (*nf_bridge)->mask = 0;
|
||
+ (*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
|
||
+ }
|
||
+
|
||
+ return *nf_bridge;
|
||
+}
|
||
+
|
||
+struct bridge_skb_cb {
|
||
+ union {
|
||
+ __u32 ipv4;
|
||
+ } daddr;
|
||
+};
|
||
+#endif /* CONFIG_NETFILTER */
|
||
+
|
||
+#endif /* __KERNEL__ */
|
||
#endif
|
||
--- linux-2.4.21/net/Makefile Sat Aug 3 02:39:46 2002
|
||
+++ linux-2.4.21-ebt-brnf-3/net/Makefile Fri Aug 8 01:09:06 2003
|
||
@@ -7,7 +7,8 @@
|
||
|
||
O_TARGET := network.o
|
||
|
||
-mod-subdirs := ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink sched core
|
||
+mod-subdirs := ipv4/netfilter ipv6/netfilter bridge/netfilter ipx irda \
|
||
+ bluetooth atm netlink sched core
|
||
export-objs := netsyms.o
|
||
|
||
subdir-y := core ethernet
|
||
@@ -23,6 +24,12 @@ subdir-$(CONFIG_IPV6) += ipv6
|
||
ifneq ($(CONFIG_IPV6),n)
|
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ifneq ($(CONFIG_IPV6),)
|
||
subdir-$(CONFIG_NETFILTER) += ipv6/netfilter
|
||
+endif
|
||
+endif
|
||
+
|
||
+ifneq ($(CONFIG_BRIDGE),n)
|
||
+ifneq ($(CONFIG_BRIDGE),)
|
||
+subdir-$(CONFIG_BRIDGE) += bridge/netfilter
|
||
endif
|
||
endif
|
||
|
||
--- linux-2.4.21/net/Config.in Sat Aug 3 02:39:46 2002
|
||
+++ linux-2.4.21-ebt-brnf-3/net/Config.in Fri Aug 8 01:09:06 2003
|
||
@@ -65,6 +65,9 @@ if [ "$CONFIG_DECNET" != "n" ]; then
|
||
source net/decnet/Config.in
|
||
fi
|
||
dep_tristate '802.1d Ethernet Bridging' CONFIG_BRIDGE $CONFIG_INET
|
||
+if [ "$CONFIG_BRIDGE" != "n" -a "$CONFIG_NETFILTER" != "n" ]; then
|
||
+ source net/bridge/netfilter/Config.in
|
||
+fi
|
||
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
|
||
tristate 'CCITT X.25 Packet Layer (EXPERIMENTAL)' CONFIG_X25
|
||
tristate 'LAPB Data Link Driver (EXPERIMENTAL)' CONFIG_LAPB
|
||
--- /dev/null Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/Makefile Fri Aug 8 01:09:06 2003
|
||
@@ -0,0 +1,30 @@
|
||
+#
|
||
+# Makefile for the netfilter modules on top of bridging.
|
||
+#
|
||
+# Note! Dependencies are done automagically by 'make dep', which also
|
||
+# 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-$(CONFIG_BRIDGE_EBT_IPF) += ebt_ip.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_ARPF) += ebt_arp.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_VLANF) += ebt_vlan.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_MARKF) += ebt_mark_m.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_802_3) += ebt_802_3.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_pkttype.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_stp.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_DNAT) += ebt_dnat.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_REDIRECT) += ebt_redirect.o
|
||
+obj-$(CONFIG_BRIDGE_EBT_MARK_T) += ebt_mark.o
|
||
+include $(TOPDIR)/Rules.make
|
||
--- /dev/null Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/Config.in Fri Aug 8 01:09:06 2003
|
||
@@ -0,0 +1,19 @@
|
||
+#
|
||
+# 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: 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: 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: 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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebtable_filter.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebtable_nat.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebtable_broute.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_802_3.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_mark.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_mark_m.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_pkttype.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_stp.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_redirect.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_arp.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_ip.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_vlan.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_log.c Fri Aug 8 01:09:06 2003
|
||
@@ -0,0 +1,152 @@
|
||
+/*
|
||
+ * 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, 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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_snat.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_dnat.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebtables.c Fri Aug 8 01:09:06 2003
|
||
@@ -0,0 +1,1490 @@
|
||
+/*
|
||
+ * 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, const struct net_device *in,
|
||
+ const struct net_device *out)
|
||
+{
|
||
+ w->u.watcher->watcher(skb, 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)
|
||
+{
|
||
+ if (*entry == '\0')
|
||
+ return 0;
|
||
+ if (!device)
|
||
+ return 1;
|
||
+ return !!strcmp(entry, device->name);
|
||
+}
|
||
+
|
||
+#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 = table->private;
|
||
+
|
||
+ read_lock_bh(&table->lock);
|
||
+ 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, 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<6D>):
|
||
+ // - 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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebtables.h Fri Aug 8 01:09:06 2003
|
||
@@ -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_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;
|
||
+};
|
||
+
|
||
+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] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
|
||
+};
|
||
+
|
||
+// 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] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
|
||
+};
|
||
+
|
||
+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] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
|
||
+};
|
||
+
|
||
+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] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
|
||
+};
|
||
+
|
||
+#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] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
|
||
+};
|
||
+
|
||
+// [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, 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_replace)-1)) & \
|
||
+ ~(__alignof__(struct ebt_replace)-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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_802_3.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_arp.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_ip.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_pkttype.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_stp.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_vlan.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_log.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_nat.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_redirect.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_mark_m.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_mark_t.h Fri Aug 8 01:09:06 2003
|
||
@@ -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-2.4.21/include/linux/netfilter.h Thu Nov 22 20:47:48 2001
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter.h Fri Aug 8 01:09:06 2003
|
||
@@ -117,28 +117,34 @@ 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) \
|
||
+nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN)
|
||
+#define NF_HOOK_THRESH nf_hook_slow
|
||
#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)))
|
||
+ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN))
|
||
+#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
|
||
+(list_empty(&nf_hooks[(pf)][(hook)]) \
|
||
+ ? (okfn)(skb) \
|
||
+ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), (thresh)))
|
||
#endif
|
||
|
||
int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
|
||
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,
|
||
+int nf_setsockopt(struct sock *sk, int pf, int optval, char *opt,
|
||
int len);
|
||
int nf_getsockopt(struct sock *sk, int pf, int optval, char *opt,
|
||
int *len);
|
||
|
||
/* Packet queuing */
|
||
-typedef int (*nf_queue_outfn_t)(struct sk_buff *skb,
|
||
+typedef int (*nf_queue_outfn_t)(struct sk_buff *skb,
|
||
struct nf_info *info, void *data);
|
||
-extern int nf_register_queue_handler(int pf,
|
||
+extern int nf_register_queue_handler(int pf,
|
||
nf_queue_outfn_t outfn, void *data);
|
||
extern int nf_unregister_queue_handler(int pf);
|
||
extern void nf_reinject(struct sk_buff *skb,
|
||
--- linux-2.4.21/include/linux/netfilter_ipv4.h Mon Feb 25 20:38:13 2002
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_ipv4.h Fri Aug 8 01:09:06 2003
|
||
@@ -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-2.4.21/include/linux/skbuff.h Fri Jun 13 16:51:39 2003
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/skbuff.h Fri Aug 8 01:09:06 2003
|
||
@@ -92,6 +92,17 @@ 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;
|
||
+ unsigned int mask;
|
||
+ unsigned long hh[16 / sizeof(unsigned long)];
|
||
+};
|
||
+#endif
|
||
+
|
||
#endif
|
||
|
||
struct sk_buff_head {
|
||
@@ -204,6 +215,9 @@ 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)
|
||
@@ -278,7 +292,7 @@ static inline struct sk_buff *skb_get(st
|
||
* If users==1, we are the only owner and are can avoid redundant
|
||
* atomic change.
|
||
*/
|
||
-
|
||
+
|
||
/**
|
||
* kfree_skb - free an sk_buff
|
||
* @skb: buffer to free
|
||
@@ -286,7 +300,7 @@ static inline struct sk_buff *skb_get(st
|
||
* Drop a reference to the buffer and free it if the usage count has
|
||
* hit zero.
|
||
*/
|
||
-
|
||
+
|
||
static inline void kfree_skb(struct sk_buff *skb)
|
||
{
|
||
if (atomic_read(&skb->users) == 1 || atomic_dec_and_test(&skb->users))
|
||
@@ -1165,6 +1179,20 @@ nf_conntrack_get(struct nf_ct_info *nfct
|
||
if (nfct)
|
||
atomic_inc(&nfct->master->use);
|
||
}
|
||
+
|
||
+#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
|
||
+
|
||
#endif
|
||
|
||
#endif /* __KERNEL__ */
|
||
--- linux-2.4.21/net/core/netfilter.c Sat Aug 3 02:39:46 2002
|
||
+++ linux-2.4.21-ebt-brnf-3/net/core/netfilter.c Fri Aug 8 01:09:06 2003
|
||
@@ -1,4 +1,4 @@
|
||
-/* netfilter.c: look after the filters for various protocols.
|
||
+/* netfilter.c: look after the filters for various protocols.
|
||
* Heavily influenced by the old firewall.c by David Bonn and Alan Cox.
|
||
*
|
||
* Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
|
||
@@ -342,10 +342,15 @@ 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)
|
||
{
|
||
for (*i = (*i)->next; *i != head; *i = (*i)->next) {
|
||
struct nf_hook_ops *elem = (struct nf_hook_ops *)*i;
|
||
+
|
||
+ if (hook_thresh > elem->priority)
|
||
+ continue;
|
||
+
|
||
switch (elem->hook(hook, skb, indev, outdev, okfn)) {
|
||
case NF_QUEUE:
|
||
return NF_QUEUE;
|
||
@@ -365,7 +370,7 @@ static unsigned int nf_iterate(struct li
|
||
break;
|
||
|
||
default:
|
||
- NFDEBUG("Evil return from %p(%u).\n",
|
||
+ NFDEBUG("Evil return from %p(%u).\n",
|
||
elem->hook, hook);
|
||
#endif
|
||
}
|
||
@@ -374,7 +379,7 @@ static unsigned int nf_iterate(struct li
|
||
}
|
||
|
||
int nf_register_queue_handler(int pf, nf_queue_outfn_t outfn, void *data)
|
||
-{
|
||
+{
|
||
int ret;
|
||
|
||
br_write_lock_bh(BR_NETPROTO_LOCK);
|
||
@@ -400,12 +405,12 @@ int nf_unregister_queue_handler(int pf)
|
||
return 0;
|
||
}
|
||
|
||
-/*
|
||
- * Any packet that leaves via this function must come back
|
||
+/*
|
||
+ * Any packet that leaves via this function must come back
|
||
* through nf_reinject().
|
||
*/
|
||
-static void nf_queue(struct sk_buff *skb,
|
||
- struct list_head *elem,
|
||
+static void nf_queue(struct sk_buff *skb,
|
||
+ struct list_head *elem,
|
||
int pf, unsigned int hook,
|
||
struct net_device *indev,
|
||
struct net_device *outdev,
|
||
@@ -413,6 +418,10 @@ 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);
|
||
@@ -428,18 +437,31 @@ static void nf_queue(struct sk_buff *skb
|
||
return;
|
||
}
|
||
|
||
- *info = (struct nf_info) {
|
||
+ *info = (struct nf_info) {
|
||
(struct nf_hook_ops *)elem, pf, hook, indev, outdev, okfn };
|
||
|
||
/* Bump dev refs so they don't vanish while packet is out */
|
||
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;
|
||
@@ -449,7 +471,8 @@ static void nf_queue(struct sk_buff *skb
|
||
int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
|
||
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;
|
||
@@ -481,7 +504,7 @@ int nf_hook_slow(int pf, unsigned int ho
|
||
|
||
elem = &nf_hooks[pf][hook];
|
||
verdict = nf_iterate(&nf_hooks[pf][hook], &skb, hook, indev,
|
||
- outdev, &elem, okfn);
|
||
+ outdev, &elem, okfn, hook_thresh);
|
||
if (verdict == NF_QUEUE) {
|
||
NFDEBUG("nf_hook: Verdict = QUEUE.\n");
|
||
nf_queue(skb, elem, pf, hook, indev, outdev, okfn);
|
||
@@ -510,6 +533,14 @@ 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. */
|
||
@@ -528,9 +559,9 @@ void nf_reinject(struct sk_buff *skb, st
|
||
|
||
if (verdict == NF_ACCEPT) {
|
||
verdict = nf_iterate(&nf_hooks[info->pf][info->hook],
|
||
- &skb, info->hook,
|
||
+ &skb, info->hook,
|
||
info->indev, info->outdev, &elem,
|
||
- info->okfn);
|
||
+ info->okfn, INT_MIN);
|
||
}
|
||
|
||
switch (verdict) {
|
||
@@ -539,20 +570,19 @@ void nf_reinject(struct sk_buff *skb, st
|
||
break;
|
||
|
||
case NF_QUEUE:
|
||
- nf_queue(skb, elem, info->pf, info->hook,
|
||
+ nf_queue(skb, elem, info->pf, info->hook,
|
||
info->indev, info->outdev, info->okfn);
|
||
break;
|
||
-
|
||
- case NF_DROP:
|
||
- kfree_skb(skb);
|
||
- break;
|
||
}
|
||
br_read_unlock_bh(BR_NETPROTO_LOCK);
|
||
|
||
/* Release those devices we held, or Alexey will kill me. */
|
||
if (info->indev) dev_put(info->indev);
|
||
if (info->outdev) dev_put(info->outdev);
|
||
-
|
||
+
|
||
+ if (verdict == NF_DROP)
|
||
+ kfree_skb(skb);
|
||
+
|
||
kfree(info);
|
||
return;
|
||
}
|
||
--- linux-2.4.21/net/core/skbuff.c Fri Jun 13 16:51:39 2003
|
||
+++ linux-2.4.21-ebt-brnf-3/net/core/skbuff.c Fri Aug 8 01:09:06 2003
|
||
@@ -245,6 +245,9 @@ 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;
|
||
@@ -325,6 +328,9 @@ 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);
|
||
@@ -391,6 +397,9 @@ 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);
|
||
@@ -403,6 +412,9 @@ 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;
|
||
}
|
||
@@ -436,6 +448,10 @@ static void copy_skb_header(struct sk_bu
|
||
nf_conntrack_get(new->nfct);
|
||
#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
|
||
--- linux-2.4.21/net/ipv4/netfilter/ip_tables.c Fri Jun 13 16:51:39 2003
|
||
+++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/ip_tables.c Fri Aug 8 01:09:06 2003
|
||
@@ -121,12 +121,19 @@ 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))
|
||
|
||
@@ -156,7 +163,15 @@ 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)":"");
|
||
@@ -169,7 +184,15 @@ 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)":"");
|
||
@@ -268,6 +291,9 @@ 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;
|
||
|
||
@@ -277,6 +303,13 @@ 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
|
||
@@ -312,7 +345,15 @@ 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-2.4.21/net/ipv4/ip_output.c Fri Nov 29 00:53:15 2002
|
||
+++ linux-2.4.21-ebt-brnf-3/net/ipv4/ip_output.c Fri Aug 8 01:09:06 2003
|
||
@@ -879,6 +879,10 @@ 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-2.4.21/net/ipv4/netfilter/ipt_LOG.c Mon Feb 25 20:38:14 2002
|
||
+++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/ipt_LOG.c Fri Aug 8 01:09:06 2003
|
||
@@ -289,6 +289,18 @@ 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-2.4.21/net/ipv4/netfilter/Makefile Fri Jun 13 16:51:39 2003
|
||
+++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/Makefile Fri Aug 8 01:09:06 2003
|
||
@@ -84,6 +84,8 @@ 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-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o
|
||
--- linux-2.4.21/net/ipv4/netfilter/Config.in Fri Jun 13 16:51:39 2003
|
||
+++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/Config.in Fri Aug 8 01:09:06 2003
|
||
@@ -43,6 +43,9 @@ if [ "$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
|
||
+ fi
|
||
# The targets
|
||
dep_tristate ' Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES
|
||
if [ "$CONFIG_IP_NF_FILTER" != "n" ]; then
|
||
--- /dev/null Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/bridge/br_netfilter.c Fri Aug 8 01:09:06 2003
|
||
@@ -0,0 +1,636 @@
|
||
+/*
|
||
+ * Handle firewalling
|
||
+ * Linux ethernet bridge
|
||
+ *
|
||
+ * Authors:
|
||
+ * Lennert Buytenhek <buytenh@gnu.org>
|
||
+ * Bart De Schuymer <bdschuym@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.
|
||
+ *
|
||
+ * 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/netfilter_bridge.h>
|
||
+#include <linux/netfilter_ipv4.h>
|
||
+#include <linux/in_route.h>
|
||
+#include <net/ip.h>
|
||
+#include <asm/uaccess.h>
|
||
+#include <asm/checksum.h>
|
||
+#include "br_private.h"
|
||
+
|
||
+
|
||
+#define skb_origaddr(skb) (((struct bridge_skb_cb *) \
|
||
+ (skb->cb))->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 clear_cb(skb) (memset(&skb_origaddr(skb), 0, \
|
||
+ sizeof(struct bridge_skb_cb)))
|
||
+
|
||
+#define has_bridge_parent(device) ((device)->br_port != NULL)
|
||
+#define bridge_parent(device) (&((device)->br_port->br->dev))
|
||
+
|
||
+/* 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 *********************************************/
|
||
+static void __br_dnat_complain(void)
|
||
+{
|
||
+ static unsigned long last_complaint = 0;
|
||
+
|
||
+ 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->dev = bridge_parent(skb->dev);
|
||
+ 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;
|
||
+ }
|
||
+
|
||
+ 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;
|
||
+ clear_cb(skb);
|
||
+ 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);
|
||
+ }
|
||
+ } else {
|
||
+ skb->dst = (struct dst_entry *)&__fake_rtable;
|
||
+ dst_hold(skb->dst);
|
||
+ }
|
||
+
|
||
+ clear_cb(skb);
|
||
+ skb->dev = nf_bridge->physindev;
|
||
+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
|
||
+ br_handle_frame_finish, 1);
|
||
+
|
||
+ return 0;
|
||
+}
|
||
+
|
||
+/* 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;
|
||
+ struct nf_bridge_info *nf_bridge;
|
||
+
|
||
+ if ((*pskb)->protocol != __constant_htons(ETH_P_IP))
|
||
+ return NF_ACCEPT;
|
||
+
|
||
+ if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
|
||
+ goto out;
|
||
+
|
||
+ 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;
|
||
+
|
||
+ if (skb->pkt_type == PACKET_OTHERHOST) {
|
||
+ skb->pkt_type = PACKET_HOST;
|
||
+ nf_bridge->mask |= BRNF_PKT_TYPE;
|
||
+ }
|
||
+
|
||
+ nf_bridge->physindev = skb->dev;
|
||
+ skb->dev = bridge_parent(skb->dev);
|
||
+ 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->protocol != __constant_htons(ETH_P_IP))
|
||
+ return NF_ACCEPT;
|
||
+
|
||
+ 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;
|
||
+
|
||
+#ifdef CONFIG_NETFILTER_DEBUG
|
||
+ skb->nf_debug ^= (1 << NF_BR_FORWARD);
|
||
+#endif
|
||
+
|
||
+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
|
||
+ skb->pkt_type = PACKET_OTHERHOST;
|
||
+ nf_bridge->mask ^= BRNF_PKT_TYPE;
|
||
+ }
|
||
+
|
||
+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, nf_bridge->physindev,
|
||
+ skb->dev, br_forward_finish, 1);
|
||
+
|
||
+ return 0;
|
||
+}
|
||
+
|
||
+/* This is the 'purely bridged' case. 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.
|
||
+ */
|
||
+static unsigned int br_nf_forward(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;
|
||
+
|
||
+ if (skb->protocol != __constant_htons(ETH_P_IP))
|
||
+ return NF_ACCEPT;
|
||
+
|
||
+#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;
|
||
+ }
|
||
+
|
||
+ nf_bridge->mask |= BRNF_BRIDGED; /* The physdev module checks on this */
|
||
+ nf_bridge->physoutdev = skb->dev;
|
||
+
|
||
+ NF_HOOK(PF_INET, NF_IP_FORWARD, skb, bridge_parent(nf_bridge->physindev),
|
||
+ bridge_parent(skb->dev), 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
|
||
+
|
||
+ 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 *))
|
||
+{
|
||
+ int (*okfn)(struct sk_buff *skb);
|
||
+ struct net_device *realindev;
|
||
+ struct sk_buff *skb = *pskb;
|
||
+ struct nf_bridge_info *nf_bridge;
|
||
+
|
||
+ if (skb->protocol != __constant_htons(ETH_P_IP))
|
||
+ return NF_ACCEPT;
|
||
+
|
||
+ /* Sometimes we get packets with NULL ->dst here (for example,
|
||
+ * running a dhcp client daemon triggers this).
|
||
+ */
|
||
+ if (skb->dst == NULL)
|
||
+ return NF_ACCEPT;
|
||
+
|
||
+ 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) {
|
||
+ okfn = br_forward_finish;
|
||
+
|
||
+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
|
||
+ skb->pkt_type = PACKET_OTHERHOST;
|
||
+ nf_bridge->mask ^= BRNF_PKT_TYPE;
|
||
+ }
|
||
+
|
||
+ NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev,
|
||
+ skb->dev, okfn);
|
||
+ } else {
|
||
+ okfn = br_nf_local_out_finish;
|
||
+ /* 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_INET, NF_IP_FORWARD, skb, realindev,
|
||
+ bridge_parent(skb->dev), 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_INET, NF_IP_LOCAL_OUT, skb, realindev,
|
||
+ bridge_parent(skb->dev), okfn,
|
||
+ NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1);
|
||
+ }
|
||
+ }
|
||
+
|
||
+ 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;
|
||
+
|
||
+ /* Be very paranoid. Must be a device driver bug. */
|
||
+ 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.");
|
||
+ if (skb->dev != NULL) {
|
||
+ printk("[%s]", skb->dev->name);
|
||
+ if (has_bridge_parent(skb->dev))
|
||
+ printk("[%s]", bridge_parent(skb->dev)->name);
|
||
+ }
|
||
+ printk("\n");
|
||
+ return NF_ACCEPT;
|
||
+ }
|
||
+
|
||
+ if (skb->protocol != __constant_htons(ETH_P_IP))
|
||
+ return NF_ACCEPT;
|
||
+
|
||
+ /* 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
|
||
+ 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;
|
||
+ }
|
||
+
|
||
+ memcpy(nf_bridge->hh, skb->data - 16, 16);
|
||
+
|
||
+ NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL,
|
||
+ bridge_parent(skb->dev), br_dev_queue_push_xmit);
|
||
+
|
||
+ return NF_STOLEN;
|
||
+}
|
||
+
|
||
+
|
||
+/* IPv4/SABOTAGE *****************************************************/
|
||
+
|
||
+/* Don't hand locally destined packets to PF_INET/PRE_ROUTING
|
||
+ * for the second time.
|
||
+ */
|
||
+static unsigned int ipv4_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 (in->hard_start_xmit == br_dev_xmit &&
|
||
+ okfn != br_nf_pre_routing_finish) {
|
||
+ okfn(*pskb);
|
||
+ return NF_STOLEN;
|
||
+ }
|
||
+
|
||
+ 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 ipv4_sabotage_out(unsigned int hook, struct sk_buff **pskb,
|
||
+ const struct net_device *in, const struct net_device *out,
|
||
+ int (*okfn)(struct sk_buff *))
|
||
+{
|
||
+ 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) {
|
||
+ struct sk_buff *skb = *pskb;
|
||
+ struct nf_bridge_info *nf_bridge;
|
||
+
|
||
+ if (!skb->nf_bridge && !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;
|
||
+ }
|
||
+ okfn(skb);
|
||
+ return NF_STOLEN;
|
||
+ }
|
||
+
|
||
+ 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,
|
||
+ .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 = ipv4_sabotage_in,
|
||
+ .pf = PF_INET,
|
||
+ .hooknum = NF_IP_PRE_ROUTING,
|
||
+ .priority = NF_IP_PRI_FIRST, },
|
||
+ { .hook = ipv4_sabotage_out,
|
||
+ .pf = PF_INET,
|
||
+ .hooknum = NF_IP_FORWARD,
|
||
+ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, },
|
||
+ { .hook = ipv4_sabotage_out,
|
||
+ .pf = PF_INET,
|
||
+ .hooknum = NF_IP_LOCAL_OUT,
|
||
+ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, },
|
||
+ { .hook = ipv4_sabotage_out,
|
||
+ .pf = PF_INET,
|
||
+ .hooknum = NF_IP_POST_ROUTING,
|
||
+ .priority = NF_IP_PRI_FIRST, },
|
||
+};
|
||
+
|
||
+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;
|
||
+ }
|
||
+
|
||
+ 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]);
|
||
+}
|
||
--- /dev/null Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/ipt_physdev.c Fri Aug 8 01:09:06 2003
|
||
@@ -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 Thu Aug 24 11:00:32 2000
|
||
+++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_ipv4/ipt_physdev.h Fri Aug 8 01:09:06 2003
|
||
@@ -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 {
|
||
+ u_int8_t invert;
|
||
+ u_int8_t bitmask;
|
||
+ char physindev[IFNAMSIZ];
|
||
+ char in_mask[IFNAMSIZ];
|
||
+ char physoutdev[IFNAMSIZ];
|
||
+ char out_mask[IFNAMSIZ];
|
||
+};
|
||
+
|
||
+#endif /*_IPT_PHYSDEV_H*/
|