Commit 32019e65 authored Jul 24, 2011 by YOSHIFUJI Hideaki Committed by David S. Miller Jul 25, 2011

ipv6: Do not leave router anycast address for /127 prefixes.



Original commit 2bda8a0c... "Disable router anycast
address for /127 prefixes" says:

|   No need for matching code in addrconf_leave_anycast() as it
|   will silently ignore any attempt to leave an unknown anycast
|   address.

After analysis, because 1) we may add two or more prefixes on the
same interface, or 2)user may have manually joined that anycast,
we may hit chances to have anycast address which as if we had
generated one by /127 prefix and we should not leave from subnet-
router anycast address unconditionally.

CC: Bjørn Mork <bjorn@mork.no>
CC: Brian Haley <brian.haley@hp.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 5ec9e63c

net/ipv6/addrconf.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1481,6 +1481,8 @@ 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 */
		return;
		ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
		if (ipv6_addr_any(&addr))
		return;

Admin message