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net: Socket filter ancilliary data access for skb->dev->type 

Add an SKF_AD_HATYPE field to the packet ancilliary data area, giving
access to skb->dev->type, as reported in the sll_hatype field.

When capturing packets on a PF_PACKET/SOCK_RAW socket bound to all
interfaces, there doesn't appear to be a way for the filter program to
actually find out the underlying hardware type the packet was captured
on. This patch adds such ability.

This patch also handles the case where skb->dev can be NULL, such as on
netlink sockets.

Signed-off-by: Paul Evans <leonerd@leonerd.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul LeoNerd Evans 2010-04-22 03:32:22 +00:00 committed by David S. Miller
parent aa2ea0586d
commit 40eaf96271
2 changed files with 9 additions and 1 deletions
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3
include/linux/filter.h
View File

@ -123,7 +123,8 @@ struct sock_fprog { /* Required for SO_ATTACH_FILTER. */
#define SKF_AD_NLATTR_NEST 16
#define SKF_AD_MARK 20
#define SKF_AD_QUEUE 24
#define SKF_AD_MAX 28
#define SKF_AD_HATYPE 28
#define SKF_AD_MAX 32
#define SKF_NET_OFF (-0x100000)
#define SKF_LL_OFF (-0x200000)

7
net/core/filter.c
View File

@ -302,6 +302,8 @@ load_b:
A = skb->pkt_type;
continue;
case SKF_AD_IFINDEX:
if (!skb->dev)
return 0;
A = skb->dev->ifindex;
continue;
case SKF_AD_MARK:
@ -310,6 +312,11 @@ load_b:
case SKF_AD_QUEUE:
A = skb->queue_mapping;
continue;
case SKF_AD_HATYPE:
if (!skb->dev)
return 0;
A = skb->dev->type;
continue;
case SKF_AD_NLATTR: {
struct nlattr *nla;