diff options
Diffstat (limited to 'target/linux/generic/patches-2.6.32/240-packet_socket_type.patch')
| -rw-r--r-- | target/linux/generic/patches-2.6.32/240-packet_socket_type.patch | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.32/240-packet_socket_type.patch b/target/linux/generic/patches-2.6.32/240-packet_socket_type.patch new file mode 100644 index 0000000000..864f5733ac --- /dev/null +++ b/target/linux/generic/patches-2.6.32/240-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_MASK_ANY 0xffffffff /* mask for packet type bits */ ++ + + /* Packet socket options */ + +@@ -48,6 +50,7 @@ struct sockaddr_ll + #define PACKET_RESERVE 12 + #define PACKET_TX_RING 13 + #define PACKET_LOSS 14 ++#define PACKET_RECV_TYPE 15 + + struct tpacket_stats + { +--- a/net/packet/af_packet.c ++++ b/net/packet/af_packet.c +@@ -204,6 +204,7 @@ struct packet_sock { + unsigned int tp_reserve; + unsigned int tp_loss:1; + #endif ++ unsigned int pkt_type; + }; + + struct packet_skb_cb { +@@ -342,6 +343,7 @@ 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 +@@ -349,6 +351,7 @@ 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 +@@ -361,7 +364,7 @@ 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)) +@@ -545,12 +548,12 @@ 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; + +@@ -667,12 +670,12 @@ 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; + +@@ -1390,6 +1393,7 @@ 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_MASK_ANY & ~(1 << PACKET_LOOPBACK); + + if (sock->type == SOCK_PACKET) + po->prot_hook.func = packet_rcv_spkt; +@@ -1737,6 +1741,16 @@ packet_setsockopt(struct socket *sock, i + ret = packet_mc_drop(sk, &mreq); + return ret; + } ++ 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; ++ } + + #ifdef CONFIG_PACKET_MMAP + case PACKET_RX_RING: +@@ -1882,6 +1896,13 @@ static int packet_getsockopt(struct sock + + data = &val; + break; ++ case PACKET_RECV_TYPE: ++ if (len > sizeof(unsigned int)) ++ len = sizeof(unsigned int); ++ val = po->pkt_type; ++ ++ data = &val; ++ break; + #ifdef CONFIG_PACKET_MMAP + case PACKET_VERSION: + if (len > sizeof(int)) |