[PATCH] ipv6: Use ipv6_authlen for len in ipv6_skip_exthdr

[Xiang Gao]

In ipv6_skip_exthdr, the lengh of AH header is computed manually
as (hp->hdrlen+2)<<2. However, in include/linux/ipv6.h, a macro
named ipv6_authlen is already defined for exactly the same job. This
commit replaces the manual computation code with the macro.

Signed-off-by: Xiang Gao <qasdfgtyu...@gmail.com>
---
 net/ipv6/exthdrs_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c
index 305e2ed730bf..115d60919f72 100644
--- a/net/ipv6/exthdrs_core.c
+++ b/net/ipv6/exthdrs_core.c
@@ -99,7 +99,7 @@ int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 
*nexthdrp,
                                break;
                        hdrlen = 8;
                } else if (nexthdr == NEXTHDR_AUTH)
-                       hdrlen = (hp->hdrlen+2)<<2;
+                       hdrlen = ipv6_authlen(hp);
                else
                        hdrlen = ipv6_optlen(hp);
 
-- 
2.14.1