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authorFelix Fietkau <nbd@openwrt.org>2009-04-25 03:30:15 +0000
committerFelix Fietkau <nbd@openwrt.org>2009-04-25 03:30:15 +0000
commit4898039703d7315f0f3431c860123338ec3be0f6 (patch)
tree78662ecc9aca91002ed6df26843cf9aef2bdc182 /target/linux/generic-2.6/patches-2.6.29
parent25e9d9025668dc638fcd171e43bbf9cd2895ea31 (diff)
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add an optimization for dealing with raw sockets, which allows applications to filter out (among others) local tx packets on capture
SVN-Revision: 15399
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.29')
-rw-r--r--target/linux/generic-2.6/patches-2.6.29/240-packet_socket_type.patch132
1 files changed, 132 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.29/240-packet_socket_type.patch b/target/linux/generic-2.6/patches-2.6.29/240-packet_socket_type.patch
new file mode 100644
index 0000000000..741966bc6c
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.29/240-packet_socket_type.patch
@@ -0,0 +1,132 @@
+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
+@@ -31,6 +31,8 @@ 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_ANY 0xffffffff
++
+
+ /* Packet socket options */
+
+@@ -46,6 +48,7 @@ struct sockaddr_ll
+ #define PACKET_VERSION 10
+ #define PACKET_HDRLEN 11
+ #define PACKET_RESERVE 12
++#define PACKET_RECV_TYPE 13
+
+ struct tpacket_stats
+ {
+--- a/net/packet/af_packet.c
++++ b/net/packet/af_packet.c
+@@ -192,6 +192,7 @@ struct packet_sock {
+ unsigned int tp_hdrlen;
+ unsigned int tp_reserve;
+ #endif
++ int pkt_type;
+ };
+
+ struct packet_skb_cb {
+@@ -282,6 +283,7 @@ static int packet_rcv_spkt(struct sk_buf
+ {
+ struct sock *sk;
+ struct sockaddr_pkt *spkt;
++ struct packet_sock *po;
+
+ /*
+ * When we registered the protocol we saved the socket in the data
+@@ -289,6 +291,7 @@ static int packet_rcv_spkt(struct sk_buf
+ */
+
+ sk = pt->af_packet_priv;
++ po = pkt_sk(sk);
+
+ /*
+ * Yank back the headers [hope the device set this
+@@ -301,7 +304,7 @@ static int packet_rcv_spkt(struct sk_buf
+ * so that this procedure is noop.
+ */
+
+- if (skb->pkt_type == PACKET_LOOPBACK)
++ if (!(po->pkt_type & (1 << skb->pkt_type)))
+ goto out;
+
+ if (dev_net(dev) != sock_net(sk))
+@@ -486,12 +489,12 @@ static int packet_rcv(struct sk_buff *sk
+ 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 (dev_net(dev) != sock_net(sk))
+ goto drop;
+
+@@ -608,12 +611,12 @@ static int tpacket_rcv(struct sk_buff *s
+ struct timeval tv;
+ struct timespec ts;
+
+- 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 (dev_net(dev) != sock_net(sk))
+ goto drop;
+
+@@ -1072,6 +1075,7 @@ static int packet_create(struct net *net
+ spin_lock_init(&po->bind_lock);
+ mutex_init(&po->pg_vec_lock);
+ po->prot_hook.func = packet_rcv;
++ po->pkt_type = PACKET_ANY & ~PACKET_LOOPBACK;
+
+ if (sock->type == SOCK_PACKET)
+ po->prot_hook.func = packet_rcv_spkt;
+@@ -1411,6 +1415,16 @@ packet_setsockopt(struct socket *sock, i
+ ret = packet_mc_drop(sk, &mreq);
+ return ret;
+ }
++ case PACKET_RECV_TYPE:
++ {
++ 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;
++ }
+
+ #ifdef CONFIG_PACKET_MMAP
+ case PACKET_RX_RING:
+@@ -1542,6 +1556,13 @@ static int packet_getsockopt(struct sock
+
+ data = &val;
+ break;
++ case PACKET_RECV_TYPE:
++ if (len > sizeof(int))
++ len = sizeof(int);
++ val = po->pkt_type;
++
++ data = &val;
++ break;
+ #ifdef CONFIG_PACKET_MMAP
+ case PACKET_VERSION:
+ if (len > sizeof(int))