From 1f85851e17b64cabd089a8a8839dddebc627948c Mon Sep 17 00:00:00 2001 From: Gao feng Date: Mon, 19 Mar 2012 22:36:10 +0000 Subject: [PATCH] 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 Acked-by: Steffen Klassert Signed-off-by: David S. Miller --- net/ipv6/ip6_output.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 7a98fc2a5d97..b7ca46161cb9 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1414,8 +1414,9 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, */ 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 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, /* * 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) {