ipv6: Make IP6CB(skb)->nhoff 16-bit.

Even with jumbograms I cannot see any way in which we would need
to records a larger than 65535 valued next-header offset.

The maximum extension header length is (256 << 3) == 2048.
There are only a handful of extension headers specified which
we'd even accept (say 5 or 6), therefore the largest next-header
offset we'd ever have to contend with is something less than
say 16k.

Therefore make it a u16 instead of a u32.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 940e2159535171ea5fe581ad7517d53b3ef8c31c..ab9e9e89e4074318405a595c1147642e344255c0 100644 (file)
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -246,7 +246,7 @@ struct inet6_skb_parm {
        __u16                   srcrt;
        __u16                   dst1;
        __u16                   lastopt;
-       __u32                   nhoff;
+       __u16                   nhoff;
        __u16                   flags;
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
        __u16                   dsthao;