diff options
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.28')
| -rw-r--r-- | target/linux/generic-2.6/patches-2.6.28/240-packet_socket_type.patch | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.28/240-packet_socket_type.patch b/target/linux/generic-2.6/patches-2.6.28/240-packet_socket_type.patch new file mode 100644 index 0000000000..741966bc6c --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.28/240-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)) |