ipv6: Use ipv6_authlen for len in ipv6_skip_exthdr

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

diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c
index 305e2ed..115d609 100644 (file)
--- 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);