From: Xiang Gao <qasdfgtyuiop@gmail.com>
Date: Wed, 20 Sep 2017 16:18:17 +0000 (-0400)
Subject: ipv6: Use ipv6_authlen for len in ipv6_skip_exthdr
X-Git-Tag: v4.19~2168^2~688
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d4e1b299ec2853dd3d90b71ae86fa2626e60dc25;p=platform%2Fkernel%2Flinux-rpi.git

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
--- 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);