1 files changed, 52 insertions, 22 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index bdbc38e8bf29..947ed1ded026 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -102,11 +102,13 @@ static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
 #ifdef CONFIG_IPV6_ROUTE_INFO
 static struct rt6_info *rt6_add_route_info(struct net *net,
                                            const struct in6_addr *prefix, int prefixlen,
-                                           const struct in6_addr *gwaddr, int ifindex,
+                                           const struct in6_addr *gwaddr,
+                                           struct net_device *dev,
                                            unsigned int pref);
 static struct rt6_info *rt6_get_route_info(struct net *net,
                                            const struct in6_addr *prefix, int prefixlen,
-                                           const struct in6_addr *gwaddr, int ifindex);
+                                           const struct in6_addr *gwaddr,
+                                           struct net_device *dev);
 #endif
 
 struct uncached_list {
@@ -656,7 +658,8 @@ static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
         struct net_device *dev = rt->dst.dev;
 
         if (dev && !netif_carrier_ok(dev) &&
-            idev->cnf.ignore_routes_with_linkdown)
+            idev->cnf.ignore_routes_with_linkdown &&
+            !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
                 goto out;
 
         if (rt6_check_expired(rt))
@@ -803,7 +806,7 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
                 rt = rt6_get_dflt_router(gwaddr, dev);
         else
                 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
-                                        gwaddr, dev->ifindex);
+                                        gwaddr, dev);
 
         if (rt && !lifetime) {
                 ip6_del_rt(rt);
@@ -811,8 +814,8 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
         }
 
         if (!rt && lifetime)
-                rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
-                                        pref);
+                rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
+                                        dev, pref);
         else if (rt)
                 rt->rt6i_flags = RTF_ROUTEINFO |
                                  (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
@@ -1050,6 +1053,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
         int strict = 0;
 
         strict |= flags & RT6_LOOKUP_F_IFACE;
+        strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
         if (net->ipv6.devconf_all->forwarding == 0)
                 strict |= RT6_LOOKUP_F_REACHABLE;
 
@@ -1789,7 +1793,7 @@ static struct rt6_info *ip6_nh_lookup_table(struct net *net,
         };
         struct fib6_table *table;
         struct rt6_info *rt;
-        int flags = RT6_LOOKUP_F_IFACE;
+        int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;
 
         table = fib6_get_table(net, cfg->fc_table);
         if (!table)
@@ -2325,13 +2329,16 @@ static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
 #ifdef CONFIG_IPV6_ROUTE_INFO
 static struct rt6_info *rt6_get_route_info(struct net *net,
                                            const struct in6_addr *prefix, int prefixlen,
-                                           const struct in6_addr *gwaddr, int ifindex)
+                                           const struct in6_addr *gwaddr,
+                                           struct net_device *dev)
 {
+        u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
+        int ifindex = dev->ifindex;
         struct fib6_node *fn;
         struct rt6_info *rt = NULL;
         struct fib6_table *table;
 
-        table = fib6_get_table(net, RT6_TABLE_INFO);
+        table = fib6_get_table(net, tb_id);
         if (!table)
                 return NULL;
 
@@ -2357,12 +2364,13 @@ out:
 
 static struct rt6_info *rt6_add_route_info(struct net *net,
                                            const struct in6_addr *prefix, int prefixlen,
-                                           const struct in6_addr *gwaddr, int ifindex,
+                                           const struct in6_addr *gwaddr,
+                                           struct net_device *dev,
                                            unsigned int pref)
 {
         struct fib6_config cfg = {
                 .fc_metric      = IP6_RT_PRIO_USER,
-                .fc_ifindex     = ifindex,
+                .fc_ifindex     = dev->ifindex,
                 .fc_dst_len     = prefixlen,
                 .fc_flags       = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
                                   RTF_UP | RTF_PREF(pref),
@@ -2371,7 +2379,7 @@ static struct rt6_info *rt6_add_route_info(struct net *net,
                 .fc_nlinfo.nl_net = net,
         };
 
-        cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
+        cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
         cfg.fc_dst = *prefix;
         cfg.fc_gateway = *gwaddr;
 
@@ -2381,16 +2389,17 @@ static struct rt6_info *rt6_add_route_info(struct net *net,
 
         ip6_route_add(&cfg);
 
-        return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
+        return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
 }
 #endif
 
 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
 {
+        u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
         struct rt6_info *rt;
         struct fib6_table *table;
 
-        table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
+        table = fib6_get_table(dev_net(dev), tb_id);
         if (!table)
                 return NULL;
 
@@ -2424,20 +2433,20 @@ struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
 
         cfg.fc_gateway = *gwaddr;
 
-        ip6_route_add(&cfg);
+        if (!ip6_route_add(&cfg)) {
+                struct fib6_table *table;
+
+                table = fib6_get_table(dev_net(dev), cfg.fc_table);
+                if (table)
+                        table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
+        }
 
         return rt6_get_dflt_router(gwaddr, dev);
 }
 
-void rt6_purge_dflt_routers(struct net *net)
+static void __rt6_purge_dflt_routers(struct fib6_table *table)
 {
         struct rt6_info *rt;
-        struct fib6_table *table;
-
-        /* NOTE: Keep consistent with rt6_get_dflt_router */
-        table = fib6_get_table(net, RT6_TABLE_DFLT);
-        if (!table)
-                return;
 
 restart:
         read_lock_bh(&table->tb6_lock);
@@ -2451,6 +2460,27 @@ restart:
                 }
         }
         read_unlock_bh(&table->tb6_lock);
+
+        table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
+}
+
+void rt6_purge_dflt_routers(struct net *net)
+{
+        struct fib6_table *table;
+        struct hlist_head *head;
+        unsigned int h;
+
+        rcu_read_lock();
+
+        for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
+                head = &net->ipv6.fib_table_hash[h];
+                hlist_for_each_entry_rcu(table, head, tb6_hlist) {
+                        if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
+                                __rt6_purge_dflt_routers(table);
+                }
+        }
+
+        rcu_read_unlock();
 }
 
 static void rtmsg_to_fib6_config(struct net *net,