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authorRomain KUNTZ <r.kuntz@ipflavors.com>2013-01-16 12:47:40 +0000
committerDavid S. Miller <davem@davemloft.net>2013-01-17 03:37:13 -0500
commit7efdba5bd9a2f3e2059beeb45c9fa55eefe1bced (patch)
treeb6f0487a10e42cb0ef89f380c7a78c4ee871e585 /net/ipv6/ip6_output.c
parent3022551b6ae6d4750becc0a8e3391d4b79d5a038 (diff)
ipv6: fix header length calculation in ip6_append_data()
Commit 299b0767 (ipv6: Fix IPsec slowpath fragmentation problem) has introduced a error in the header length calculation that provokes corrupted packets when non-fragmentable extensions headers (Destination Option or Routing Header Type 2) are used. rt->rt6i_nfheader_len is the length of the non-fragmentable extension header, and it should be substracted to rt->dst.header_len, and not to exthdrlen, as it was done before commit 299b0767. This patch reverts to the original and correct behavior. It has been successfully tested with and without IPsec on packets that include non-fragmentable extensions headers. Signed-off-by: Romain Kuntz <r.kuntz@ipflavors.com> Acked-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_output.c')
-rw-r--r--net/ipv6/ip6_output.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 5552d13ae92..0c7c03d50dc 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1213,10 +1213,10 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
if (dst_allfrag(rt->dst.path))
cork->flags |= IPCORK_ALLFRAG;
cork->length = 0;
- exthdrlen = (opt ? opt->opt_flen : 0) - rt->rt6i_nfheader_len;
+ exthdrlen = (opt ? opt->opt_flen : 0);
length += exthdrlen;
transhdrlen += exthdrlen;
- dst_exthdrlen = rt->dst.header_len;
+ dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
} else {
rt = (struct rt6_info *)cork->dst;
fl6 = &inet->cork.fl.u.ip6;