From dc99f600698dcac69b8f56dda9a8a00d645c5ffc Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 5 Jul 2011 01:45:05 -0700 Subject: packet: Add fanout support. Fanouts allow packet capturing to be demuxed to a set of AF_PACKET sockets. Two fanout policies are implemented: 1) Hashing based upon skb->rxhash 2) Pure round-robin An AF_PACKET socket must be fully bound before it tries to add itself to a fanout. All AF_PACKET sockets trying to join the same fanout must all have the same bind settings. Fanouts are identified (within a network namespace) by a 16-bit ID. The first socket to try to add itself to a fanout with a particular ID, creates that fanout. When the last socket leaves the fanout (which happens only when the socket is closed), that fanout is destroyed. Signed-off-by: David S. Miller --- include/linux/if_packet.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/if_packet.h') diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h index 7b318630139f..1efa1cb827f5 100644 --- a/include/linux/if_packet.h +++ b/include/linux/if_packet.h @@ -49,6 +49,10 @@ struct sockaddr_ll { #define PACKET_VNET_HDR 15 #define PACKET_TX_TIMESTAMP 16 #define PACKET_TIMESTAMP 17 +#define PACKET_FANOUT 18 + +#define PACKET_FANOUT_HASH 0 +#define PACKET_FANOUT_LB 1 struct tpacket_stats { unsigned int tp_packets; -- cgit v1.2.3-59-g8ed1b