From 80feaacb8a6400a9540a961b6743c69a5896b937 Mon Sep 17 00:00:00 2001 From: Peter P. Waskiewicz Jr Date: Fri, 20 Apr 2007 16:05:39 -0700 Subject: [AF_PACKET]: Add option to return orig_dev to userspace. Add a packet socket option to allow the orig_dev index to be returned to userspace when passing traffic through a decapsulated device, such as the bonding driver. This is very useful for layer 2 traffic being able to report which physical device actually received the traffic, instead of having the encapsulating device hide that information. The new option is called PACKET_ORIGDEV. Signed-off-by: Peter P. Waskiewicz Jr. Signed-off-by: David S. Miller --- net/packet/af_packet.c | 32 +++++++++++++++++++++++++++++--- 1 file changed, 29 insertions(+), 3 deletions(-) (limited to 'net/packet/af_packet.c') diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 36388b2f32f9..02e401cd683f 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -201,7 +201,8 @@ struct packet_sock { struct packet_type prot_hook; spinlock_t bind_lock; unsigned int running:1, /* prot_hook is attached*/ - auxdata:1; + auxdata:1, + origdev:1; int ifindex; /* bound device */ __be16 num; #ifdef CONFIG_PACKET_MULTICAST @@ -528,7 +529,10 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet sll->sll_hatype = dev->type; sll->sll_protocol = skb->protocol; sll->sll_pkttype = skb->pkt_type; - sll->sll_ifindex = dev->ifindex; + if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST) + sll->sll_ifindex = orig_dev->ifindex; + else + sll->sll_ifindex = dev->ifindex; sll->sll_halen = 0; if (dev->hard_header_parse) @@ -673,7 +677,10 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe sll->sll_hatype = dev->type; sll->sll_protocol = skb->protocol; sll->sll_pkttype = skb->pkt_type; - sll->sll_ifindex = dev->ifindex; + if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST) + sll->sll_ifindex = orig_dev->ifindex; + else + sll->sll_ifindex = dev->ifindex; h->tp_status = status; smp_mb(); @@ -1413,6 +1420,18 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv po->auxdata = !!val; return 0; } + case PACKET_ORIGDEV: + { + int val; + + if (optlen < sizeof(val)) + return -EINVAL; + if (copy_from_user(&val, optval, sizeof(val))) + return -EFAULT; + + po->origdev = !!val; + return 0; + } default: return -ENOPROTOOPT; } @@ -1454,6 +1473,13 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, len = sizeof(int); val = po->auxdata; + data = &val; + break; + case PACKET_ORIGDEV: + if (len > sizeof(int)) + len = sizeof(int); + val = po->origdev; + data = &val; break; default: -- cgit v1.2.3-55-g7522