ipv6: del unreachable route when an addr is deleted on lo
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>
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@ -788,10 +788,16 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
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struct in6_addr prefix;
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struct rt6_info *rt;
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struct net *net = dev_net(ifp->idev->dev);
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ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
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rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
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struct flowi6 fl6 = {};
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if (rt && addrconf_is_prefix_route(rt)) {
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ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
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fl6.flowi6_oif = ifp->idev->dev->ifindex;
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fl6.daddr = prefix;
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rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
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RT6_LOOKUP_F_IFACE);
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if (rt != net->ipv6.ip6_null_entry &&
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addrconf_is_prefix_route(rt)) {
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if (onlink == 0) {
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ip6_del_rt(rt);
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rt = NULL;
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