netdev - [PATCH net] ipv6: don't install anycast address for /128 addresses on routers

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Date:	Mon, 6 Jan 2014 17:53:14 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	netdev@...r.kernel.org
Cc:	fx.lebail@...oo.com, thaller@...hat.com, jiri@...nulli.us
Subject: [PATCH net] ipv6: don't install anycast address for /128 addresses on routers

It does not make sense to create an anycast address for an /128-prefix.
Suppress it.

As 32019e651c6fce ("ipv6: Do not leave router anycast address for /127
prefixes.") shows we also may not leave them, because we could accidentally
remove an anycast address the user has allocated or got added via another
prefix.

Cc: François-Xavier Le Bail <fx.lebail@...oo.com>
Cc: Thomas Haller <thaller@...hat.com>
Cc: Jiri Pirko <jiri@...nulli.us>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 net/ipv6/addrconf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6c16345..43c8220 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1677,7 +1677,7 @@ void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
 {
 	struct in6_addr addr;
-	if (ifp->prefix_len == 127) /* RFC 6164 */
+	if (ifp->prefix_len >= 127) /* RFC 6164 */
 		return;
 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
 	if (ipv6_addr_any(&addr))
@@ -1688,7 +1688,7 @@ static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
 {
 	struct in6_addr addr;
-	if (ifp->prefix_len == 127) /* RFC 6164 */
+	if (ifp->prefix_len >= 127) /* RFC 6164 */
 		return;
 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
 	if (ipv6_addr_any(&addr))
-- 
1.8.4.2

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