From 02f1c89d6e36507476f78108a3dcc78538be460b Mon Sep 17 00:00:00 2001 From: Paul Moore <paul.moore@hp.com> Date: Mon, 7 Jan 2008 21:56:41 -0800 Subject: [PATCH] [NET]: Clone the sk_buff 'iif' field in __skb_clone() Both NetLabel and SELinux (other LSMs may grow to use it as well) rely on the 'iif' field to determine the receiving network interface of inbound packets. Unfortunately, at present this field is not preserved across a skb clone operation which can lead to garbage values if the cloned skb is sent back through the network stack. This patch corrects this problem by properly copying the 'iif' field in __skb_clone() and removing the 'iif' field assignment from skb_act_clone() since it is no longer needed. Also, while we are here, put the assignments in the same order as the offsets to reduce cacheline bounces. Signed-off-by: Paul Moore <paul.moore@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- include/net/sch_generic.h | 1 - net/core/skbuff.c | 11 ++++++----- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index c9265518a378a..4c3b35153c372 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -325,7 +325,6 @@ static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask) n->tc_verd = SET_TC_VERD(n->tc_verd, 0); n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); n->tc_verd = CLR_TC_MUNGED(n->tc_verd); - n->iif = skb->iif; } return n; } diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 5b4ce9b4dd206..b6283779e93d4 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -416,16 +416,17 @@ static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb) C(len); C(data_len); C(mac_len); - n->cloned = 1; n->hdr_len = skb->nohdr ? skb_headroom(skb) : skb->hdr_len; + n->cloned = 1; n->nohdr = 0; n->destructor = NULL; - C(truesize); - atomic_set(&n->users, 1); - C(head); - C(data); + C(iif); C(tail); C(end); + C(head); + C(data); + C(truesize); + atomic_set(&n->users, 1); atomic_inc(&(skb_shinfo(skb)->dataref)); skb->cloned = 1; -- GitLab