2010-08-29 17:35:23 +03:00
|
|
|
This patch allows the user to specify desired packet types (outgoing,
|
|
|
|
broadcast, unicast, etc.) on packet sockets via setsockopt.
|
|
|
|
This can reduce the load in situations where only a limited number
|
|
|
|
of packet types are necessary
|
|
|
|
|
|
|
|
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
|
|
|
|
|
|
|
|
--- a/include/linux/if_packet.h
|
|
|
|
+++ b/include/linux/if_packet.h
|
|
|
|
@@ -29,6 +29,8 @@ struct sockaddr_ll {
|
|
|
|
/* These ones are invisible by user level */
|
|
|
|
#define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */
|
|
|
|
#define PACKET_FASTROUTE 6 /* Fastrouted frame */
|
|
|
|
+#define PACKET_MASK_ANY 0xffffffff /* mask for packet type bits */
|
|
|
|
+
|
|
|
|
|
|
|
|
/* Packet socket options */
|
|
|
|
|
|
|
|
@@ -49,6 +51,7 @@ struct sockaddr_ll {
|
|
|
|
#define PACKET_VNET_HDR 15
|
|
|
|
#define PACKET_TX_TIMESTAMP 16
|
|
|
|
#define PACKET_TIMESTAMP 17
|
|
|
|
+#define PACKET_RECV_TYPE 18
|
|
|
|
|
|
|
|
struct tpacket_stats {
|
|
|
|
unsigned int tp_packets;
|
|
|
|
--- a/net/packet/af_packet.c
|
|
|
|
+++ b/net/packet/af_packet.c
|
2010-10-05 11:50:54 +03:00
|
|
|
@@ -205,6 +205,7 @@ struct packet_sock {
|
2010-08-29 17:35:23 +03:00
|
|
|
unsigned int tp_loss:1;
|
2010-10-05 11:50:54 +03:00
|
|
|
unsigned int tp_tstamp;
|
2010-08-29 17:35:23 +03:00
|
|
|
struct packet_type prot_hook ____cacheline_aligned_in_smp;
|
|
|
|
+ unsigned int pkt_type;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct packet_skb_cb {
|
2010-10-05 11:50:54 +03:00
|
|
|
@@ -341,6 +342,7 @@ static int packet_rcv_spkt(struct sk_buf
|
2010-08-29 17:35:23 +03:00
|
|
|
{
|
|
|
|
struct sock *sk;
|
|
|
|
struct sockaddr_pkt *spkt;
|
|
|
|
+ struct packet_sock *po;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* When we registered the protocol we saved the socket in the data
|
2010-10-05 11:50:54 +03:00
|
|
|
@@ -348,6 +350,7 @@ static int packet_rcv_spkt(struct sk_buf
|
2010-08-29 17:35:23 +03:00
|
|
|
*/
|
|
|
|
|
|
|
|
sk = pt->af_packet_priv;
|
|
|
|
+ po = pkt_sk(sk);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Yank back the headers [hope the device set this
|
2010-10-05 11:50:54 +03:00
|
|
|
@@ -360,7 +363,7 @@ static int packet_rcv_spkt(struct sk_buf
|
2010-08-29 17:35:23 +03:00
|
|
|
* so that this procedure is noop.
|
|
|
|
*/
|
|
|
|
|
|
|
|
- if (skb->pkt_type == PACKET_LOOPBACK)
|
|
|
|
+ if (!(po->pkt_type & (1 << skb->pkt_type)))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (!net_eq(dev_net(dev), sock_net(sk)))
|
2010-10-05 11:50:54 +03:00
|
|
|
@@ -539,12 +542,12 @@ static int packet_rcv(struct sk_buff *sk
|
2010-08-29 17:35:23 +03:00
|
|
|
int skb_len = skb->len;
|
|
|
|
unsigned int snaplen, res;
|
|
|
|
|
|
|
|
- if (skb->pkt_type == PACKET_LOOPBACK)
|
|
|
|
- goto drop;
|
|
|
|
-
|
|
|
|
sk = pt->af_packet_priv;
|
|
|
|
po = pkt_sk(sk);
|
|
|
|
|
|
|
|
+ if (!(po->pkt_type & (1 << skb->pkt_type)))
|
|
|
|
+ goto drop;
|
|
|
|
+
|
|
|
|
if (!net_eq(dev_net(dev), sock_net(sk)))
|
|
|
|
goto drop;
|
|
|
|
|
2010-10-05 11:50:54 +03:00
|
|
|
@@ -660,12 +663,12 @@ static int tpacket_rcv(struct sk_buff *s
|
2010-08-29 17:35:23 +03:00
|
|
|
struct timespec ts;
|
2010-10-05 11:50:54 +03:00
|
|
|
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
|
2010-08-29 17:35:23 +03:00
|
|
|
|
|
|
|
- if (skb->pkt_type == PACKET_LOOPBACK)
|
|
|
|
- goto drop;
|
|
|
|
-
|
|
|
|
sk = pt->af_packet_priv;
|
|
|
|
po = pkt_sk(sk);
|
|
|
|
|
|
|
|
+ if (!(po->pkt_type & (1 << skb->pkt_type)))
|
|
|
|
+ goto drop;
|
|
|
|
+
|
|
|
|
if (!net_eq(dev_net(dev), sock_net(sk)))
|
|
|
|
goto drop;
|
|
|
|
|
2010-10-05 11:50:54 +03:00
|
|
|
@@ -1488,6 +1491,7 @@ static int packet_create(struct net *net
|
2010-08-29 17:35:23 +03:00
|
|
|
spin_lock_init(&po->bind_lock);
|
|
|
|
mutex_init(&po->pg_vec_lock);
|
|
|
|
po->prot_hook.func = packet_rcv;
|
|
|
|
+ po->pkt_type = PACKET_MASK_ANY & ~(1 << PACKET_LOOPBACK);
|
|
|
|
|
|
|
|
if (sock->type == SOCK_PACKET)
|
|
|
|
po->prot_hook.func = packet_rcv_spkt;
|
2011-02-19 14:44:07 +02:00
|
|
|
@@ -2057,6 +2061,16 @@ packet_setsockopt(struct socket *sock, i
|
2010-10-05 11:50:54 +03:00
|
|
|
po->tp_tstamp = val;
|
2010-08-29 17:35:23 +03:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
+ case PACKET_RECV_TYPE:
|
|
|
|
+ {
|
|
|
|
+ unsigned int val;
|
|
|
|
+ if (optlen != sizeof(val))
|
|
|
|
+ return -EINVAL;
|
|
|
|
+ if (copy_from_user(&val, optval, sizeof(val)))
|
|
|
|
+ return -EFAULT;
|
|
|
|
+ po->pkt_type = val & ~PACKET_LOOPBACK;
|
|
|
|
+ return 0;
|
|
|
|
+ }
|
|
|
|
default:
|
|
|
|
return -ENOPROTOOPT;
|
|
|
|
}
|
2011-02-19 14:44:07 +02:00
|
|
|
@@ -2114,6 +2128,13 @@ static int packet_getsockopt(struct sock
|
2010-08-29 17:35:23 +03:00
|
|
|
|
|
|
|
data = &val;
|
|
|
|
break;
|
|
|
|
+ case PACKET_RECV_TYPE:
|
|
|
|
+ if (len > sizeof(unsigned int))
|
|
|
|
+ len = sizeof(unsigned int);
|
|
|
|
+ val = po->pkt_type;
|
|
|
|
+
|
|
|
|
+ data = &val;
|
|
|
|
+ break;
|
|
|
|
case PACKET_VERSION:
|
|
|
|
if (len > sizeof(int))
|
|
|
|
len = sizeof(int);
|