diff options
| author | Peter P. Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> | 2007-04-20 16:05:39 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:29:14 -0700 |
| commit | 80feaacb8a6400a9540a961b6743c69a5896b937 (patch) | |
| tree | a4f07e635de521f5e283e0f4081923a98c0256d5 /net/packet/af_packet.c | |
| parent | 1370b5a59b941ac3873b5e8614d496e9f481d670 (diff) | |
| download | lwn-80feaacb8a6400a9540a961b6743c69a5896b937.tar.gz lwn-80feaacb8a6400a9540a961b6743c69a5896b937.zip | |
[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. <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet/af_packet.c')
| -rw-r--r-- | net/packet/af_packet.c | 32 |
1 files changed, 29 insertions, 3 deletions
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; } @@ -1456,6 +1475,13 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, data = &val; break; + case PACKET_ORIGDEV: + if (len > sizeof(int)) + len = sizeof(int); + val = po->origdev; + + data = &val; + break; default: return -ENOPROTOOPT; } |