netdev - [PATCH v3] ipv6: fix incorrent ipv6 ipsec packet fragment

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Message-Id: <1332232570-17424-1-git-send-email-gaofeng@cn.fujitsu.com>
Date:	Tue, 20 Mar 2012 16:36:10 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	davem@...emloft.net
Cc:	steffen.klassert@...unet.com, netdev@...r.kernel.org,
	Gao feng <gaofeng@...fujitsu.com>
Subject: [PATCH v3] ipv6: fix incorrent ipv6 ipsec packet fragment

Since commit 299b0767(ipv6: Fix IPsec slowpath fragmentation problem)
In func ip6_append_data,after call skb_put(skb, fraglen + dst_exthdrlen)
the skb->len contains dst_exthdrlen,and we don't reduce dst_exthdrlen at last
This will make fraggap>0 in next "while cycle",and cause the size of skb incorrent

Fix this by reserve headroom for dst_exthdrlen.

Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
---
 net/ipv6/ip6_output.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index d97e071..ea58e27a 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1416,8 +1416,9 @@ alloc_new_skb:
 			 */
 			skb->ip_summed = csummode;
 			skb->csum = 0;
-			/* reserve for fragmentation */
-			skb_reserve(skb, hh_len+sizeof(struct frag_hdr));
+			/* reserve for fragmentation and ipsec header */
+			skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
+				    dst_exthdrlen);
 
 			if (sk->sk_type == SOCK_DGRAM)
 				skb_shinfo(skb)->tx_flags = tx_flags;
@@ -1425,9 +1426,9 @@ alloc_new_skb:
 			/*
 			 *	Find where to start putting bytes
 			 */
-			data = skb_put(skb, fraglen + dst_exthdrlen);
-			skb_set_network_header(skb, exthdrlen + dst_exthdrlen);
-			data += fragheaderlen + dst_exthdrlen;
+			data = skb_put(skb, fraglen);
+			skb_set_network_header(skb, exthdrlen);
+			data += fragheaderlen;
 			skb->transport_header = (skb->network_header +
 						 fragheaderlen);
 			if (fraggap) {
-- 
1.7.7.6

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