[IPV6]: Only set nfheader_len for top xfrm dst

We only need to set nfheader_len in the top xfrm dst.  This is because
we only ever read the nfheader_len from the top xfrm dst.

It is also easier to count nfheader_len as part of header_len which
then lets us remove the ugly wrapper functions for incrementing and
decrementing header lengths in xfrm6_policy.c.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 3bef30e4a23d..150615758fdc 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1098,7 +1098,8 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
                 inet->cork.length = 0;
                 sk->sk_sndmsg_page = NULL;
                 sk->sk_sndmsg_off = 0;
-                exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0);
+                exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0) -
+                            rt->u.dst.nfheader_len;
                 length += exthdrlen;
                 transhdrlen += exthdrlen;
         } else {