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packet: deliver VLAN TCI to userspace

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Store the VLAN tag in the auxillary data/tpacket2_hdr so userspace can
properly deal with hardware VLAN tagging/stripping.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-07-14 22:50:39 -07:00 committed by David S. Miller
parent bbd6ef87c5
commit 393e52e33c
2 changed files with 4 additions and 0 deletions
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2
include/linux/if_packet.h
View File

@ -59,6 +59,7 @@ struct tpacket_auxdata
__u32 tp_snaplen;
__u16 tp_mac;
__u16 tp_net;
__u16 tp_vlan_tci;
};
struct tpacket_hdr
@ -90,6 +91,7 @@ struct tpacket2_hdr
__u16 tp_net;
__u32 tp_sec;
__u32 tp_nsec;
__u16 tp_vlan_tci;
};
#define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))

2
net/packet/af_packet.c
View File

@ -702,6 +702,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
getnstimeofday(&ts);
h.h2->tp_sec = ts.tv_sec;
h.h2->tp_nsec = ts.tv_nsec;
h.h2->tp_vlan_tci = skb->vlan_tci;
hdrlen = sizeof(*h.h2);
break;
default:
@ -1172,6 +1173,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
aux.tp_snaplen = skb->len;
aux.tp_mac = 0;
aux.tp_net = skb_network_offset(skb);
aux.tp_vlan_tci = skb->vlan_tci;
put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
}