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Date: Thu, 22 Apr 2010 13:12:53 +0100
From: Paul LeoNerd Evans <leonerd@...nerd.org.uk>
To: netdev@...r.kernel.org
Subject: [PATCH] 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.
Signed-off-by: Paul Evans <leonerd@...nerd.org.uk>
---
diff -ur linux-2.6.33.2.orig/include/linux/filter.h linux-2.6.33.2/include/linux/filter.h
--- linux-2.6.33.2.orig/include/linux/filter.h 2010-04-02 00:02:33.000000000 +0100
+++ linux-2.6.33.2/include/linux/filter.h 2010-04-20 22:40:25.000000000 +0100
@@ -123,7 +123,8 @@
#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)
diff -ur linux-2.6.33.2.orig/net/core/filter.c linux-2.6.33.2/net/core/filter.c
--- linux-2.6.33.2.orig/net/core/filter.c 2010-04-02 00:02:33.000000000 +0100
+++ linux-2.6.33.2/net/core/filter.c 2010-04-20 22:41:01.000000000 +0100
@@ -309,6 +309,9 @@
case SKF_AD_QUEUE:
A = skb->queue_mapping;
continue;
+ case SKF_AD_HATYPE:
+ A = skb->dev->type;
+ continue;
case SKF_AD_NLATTR: {
struct nlattr *nla;
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