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ipv6: del unreachable route when an addr is deleted on lo

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When an address is added on loopback (ip -6 a a 2002::1/128 dev lo), two routes
are added:
 - one in the local table:
    local 2002::1 via :: dev lo  proto none  metric 0
 - one the in main table (for the prefix):
    unreachable 2002::1 dev lo  proto kernel  metric 256  error -101

When the address is deleted, the route inserted in the main table remains
because we use rt6_lookup(), which returns NULL when dst->error is set, which
is the case here! Thus, it is better to use ip6_route_lookup() to avoid this
kind of filter.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2012-09-26 00:04:55 +00:00 committed by David S. Miller
parent 515e12401f
commit 64c6d08e64
1 changed files with 9 additions and 3 deletions
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12
net/ipv6/addrconf.c
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@ -788,10 +788,16 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
struct in6_addr prefix;
struct rt6_info *rt;
struct net *net = dev_net(ifp->idev->dev);
ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
struct flowi6 fl6 = {};
if (rt && addrconf_is_prefix_route(rt)) {
ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
fl6.flowi6_oif = ifp->idev->dev->ifindex;
fl6.daddr = prefix;
rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
RT6_LOOKUP_F_IFACE);
if (rt != net->ipv6.ip6_null_entry &&
addrconf_is_prefix_route(rt)) {
if (onlink == 0) {
ip6_del_rt(rt);
rt = NULL;