netdev - [PATCH net-next v3 1/4] ipv6: remove old conditions on flow label sharing

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Date:	Tue,  5 Nov 2013 15:28:55 +0100
From:	Florent Fourcot <florent.fourcot@...t-bretagne.fr>
To:	netdev@...r.kernel.org
Cc:	Florent Fourcot <florent.fourcot@...t-bretagne.fr>
Subject: [PATCH net-next v3 1/4] ipv6: remove old conditions on flow label sharing

The code of flow label in Linux Kernel follows
the rules of RFC 1809 (an informational one) for
conditions on flow label sharing. There rules are
not in the last proposed standard for flow label
(RFC 6437), or in the previous one (RFC 3697).

Since this code does not follow any current or
old standard, we can remove it.

With this removal, the ipv6_opt_cmp and
pv6_hdr_cmp function are now a dead code and it
can be removed too.

Changelog of v2:
 * add justification for the change
 * remove the condition on IPv6 options
 * remove ipv6_opt_cmp
v3:
 * remove ipv6_hdr_cmp

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: Florent Fourcot <florent.fourcot@...t-bretagne.fr>
---
 net/ipv6/ip6_flowlabel.c | 33 ---------------------------------
 1 file changed, 33 deletions(-)

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 46e8843..819578e 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -465,34 +465,6 @@ static int mem_check(struct sock *sk)
 	return 0;
 }
 
-static bool ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
-{
-	if (h1 == h2)
-		return false;
-	if (h1 == NULL || h2 == NULL)
-		return true;
-	if (h1->hdrlen != h2->hdrlen)
-		return true;
-	return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
-}
-
-static bool ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
-{
-	if (o1 == o2)
-		return false;
-	if (o1 == NULL || o2 == NULL)
-		return true;
-	if (o1->opt_nflen != o2->opt_nflen)
-		return true;
-	if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
-		return true;
-	if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
-		return true;
-	if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
-		return true;
-	return false;
-}
-
 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
 		struct ip6_flowlabel *fl)
 {
@@ -603,11 +575,6 @@ recheck:
 				     uid_eq(fl1->owner.uid, fl->owner.uid)))
 					goto release;
 
-				err = -EINVAL;
-				if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
-				    ipv6_opt_cmp(fl1->opt, fl->opt))
-					goto release;
-
 				err = -ENOMEM;
 				if (sfl1 == NULL)
 					goto release;
-- 
1.8.4.rc3

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