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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@cn.fujitsu.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao feng 2012-03-19 22:36:10 +00:00 committed by David S. Miller
parent 5c473ed26d
commit 1f85851e17
1 changed files with 6 additions and 5 deletions
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11
net/ipv6/ip6_output.c
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@ -1414,8 +1414,9 @@ 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;
@ -1423,9 +1424,9 @@ 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) {