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ipv6: don't install anycast address for /128 addresses on routers

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

As 32019e651c ("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@yahoo.com>
Cc: Thomas Haller <thaller@redhat.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa
2014-01-06 17:53:14 +01:00
committed by David S. Miller
parent e5e97ee956
commit 88ad31491e
1 changed files with 2 additions and 2 deletions
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4
net/ipv6/addrconf.c
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@@ -1671,7 +1671,7 @@ void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
static void addrconf_join_anycast(struct inet6_ifaddr *ifp) static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
{ {
struct in6_addr addr; struct in6_addr addr;
if (ifp->prefix_len == 127) /* RFC 6164 */ if (ifp->prefix_len >= 127) /* RFC 6164 */
return; return;
ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
if (ipv6_addr_any(&addr)) if (ipv6_addr_any(&addr))
@@ -1682,7 +1682,7 @@ static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
{ {
struct in6_addr addr; struct in6_addr addr;
if (ifp->prefix_len == 127) /* RFC 6164 */ if (ifp->prefix_len >= 127) /* RFC 6164 */
return; return;
ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
if (ipv6_addr_any(&addr)) if (ipv6_addr_any(&addr))