ipv4: Invalidate nexthop cache nh_saddr more correctly.

Any operation that:

1) Brings up an interface
2) Adds an IP address to an interface
3) Deletes an IP address from an interface

can potentially invalidate the nh_saddr value, requiring
it to be recomputed.

Perform the recomputation lazily using a generation ID.

Reported-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index a1a85803591363bfc2550fb9bd171de4c09c024d..cd92b923a578fa0a13171d50f2c12abdd9c1a92d 100644 (file)
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -62,6 +62,7 @@ struct fib_nh {
        int                     nh_oif;
        __be32                  nh_gw;
        __be32                  nh_saddr;
+       int                     nh_saddr_genid;
 };
 
 /*
@@ -141,12 +142,19 @@ struct fib_result_nl {
 
 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
 
-#define FIB_RES_SADDR(res)             (FIB_RES_NH(res).nh_saddr)
+extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
+
+#define FIB_RES_SADDR(net, res)                                \
+       ((FIB_RES_NH(res).nh_saddr_genid ==             \
+         atomic_read(&(net)->ipv4.dev_addr_genid)) ?   \
+        FIB_RES_NH(res).nh_saddr :                     \
+        fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
 #define FIB_RES_GW(res)                        (FIB_RES_NH(res).nh_gw)
 #define FIB_RES_DEV(res)               (FIB_RES_NH(res).nh_dev)
 #define FIB_RES_OIF(res)               (FIB_RES_NH(res).nh_oif)
 
-#define FIB_RES_PREFSRC(res)           ((res).fi->fib_prefsrc ? : FIB_RES_SADDR(res))
+#define FIB_RES_PREFSRC(net, res)      ((res).fi->fib_prefsrc ? : \
+                                        FIB_RES_SADDR(net, res))
 
 struct fib_table {
        struct hlist_node tb_hlist;

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index e2e2ef57eca2c36233152df7d1eae1ee4ab569c2..542195d9469e0e38fccf102ebb317862113a1c34 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -55,6 +55,7 @@ struct netns_ipv4 {
        int current_rt_cache_rebuild_count;
 
        atomic_t rt_genid;
+       atomic_t dev_addr_genid;
 
 #ifdef CONFIG_IP_MROUTE
 #ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 02c3ba61884a2890d93189e6628af6554fcd61fb..f116ce8f1b466204f41279e06f57932e274fbdad 100644 (file)
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -228,7 +228,7 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
                if (res.type != RTN_LOCAL || !accept_local)
                        goto e_inval;
        }
-       *spec_dst = FIB_RES_PREFSRC(res);
+       *spec_dst = FIB_RES_PREFSRC(net, res);
        fib_combine_itag(itag, &res);
        dev_match = false;
 
@@ -258,7 +258,7 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
        ret = 0;
        if (fib_lookup(net, &fl4, &res) == 0) {
                if (res.type == RTN_UNICAST) {
-                       *spec_dst = FIB_RES_PREFSRC(res);
+                       *spec_dst = FIB_RES_PREFSRC(net, res);
                        ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
                }
        }
@@ -960,6 +960,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event,
 {
        struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
        struct net_device *dev = ifa->ifa_dev->dev;
+       struct net *net = dev_net(dev);
 
        switch (event) {
        case NETDEV_UP:
@@ -967,12 +968,12 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event,
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
                fib_sync_up(dev);
 #endif
-               fib_update_nh_saddrs(dev);
+               atomic_inc(&net->ipv4.dev_addr_genid);
                rt_cache_flush(dev_net(dev), -1);
                break;
        case NETDEV_DOWN:
                fib_del_ifaddr(ifa, NULL);
-               fib_update_nh_saddrs(dev);
+               atomic_inc(&net->ipv4.dev_addr_genid);
                if (ifa->ifa_dev->ifa_list == NULL) {
                        /* Last address was deleted from this interface.
                         * Disable IP.
@@ -990,6 +991,7 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
 {
        struct net_device *dev = ptr;
        struct in_device *in_dev = __in_dev_get_rtnl(dev);
+       struct net *net = dev_net(dev);
 
        if (event == NETDEV_UNREGISTER) {
                fib_disable_ip(dev, 2, -1);
@@ -1007,6 +1009,7 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
                fib_sync_up(dev);
 #endif
+               atomic_inc(&net->ipv4.dev_addr_genid);
                rt_cache_flush(dev_net(dev), -1);
                break;
        case NETDEV_DOWN:

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 75b9fb5d5d37b432f862135b1ee136594dea02ba..2d4bebca671a15185b7b557b952827e7e82aebb0 100644 (file)
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -695,6 +695,16 @@ static void fib_info_hash_move(struct hlist_head *new_info_hash,
        fib_info_hash_free(old_laddrhash, bytes);
 }
 
+__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh)
+{
+       nh->nh_saddr = inet_select_addr(nh->nh_dev,
+                                       nh->nh_gw,
+                                       nh->nh_cfg_scope);
+       nh->nh_saddr_genid = atomic_read(&net->ipv4.dev_addr_genid);
+
+       return nh->nh_saddr;
+}
+
 struct fib_info *fib_create_info(struct fib_config *cfg)
 {
        int err;
@@ -855,9 +865,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
 
        change_nexthops(fi) {
                nexthop_nh->nh_cfg_scope = cfg->fc_scope;
-               nexthop_nh->nh_saddr = inet_select_addr(nexthop_nh->nh_dev,
-                                                       nexthop_nh->nh_gw,
-                                                       nexthop_nh->nh_cfg_scope);
+               fib_info_update_nh_saddr(net, nexthop_nh);
        } endfor_nexthops(fi)
 
 link_it:
@@ -1128,24 +1136,6 @@ out:
        return;
 }
 
-void fib_update_nh_saddrs(struct net_device *dev)
-{
-       struct hlist_head *head;
-       struct hlist_node *node;
-       struct fib_nh *nh;
-       unsigned int hash;
-
-       hash = fib_devindex_hashfn(dev->ifindex);
-       head = &fib_info_devhash[hash];
-       hlist_for_each_entry(nh, node, head, nh_hash) {
-               if (nh->nh_dev != dev)
-                       continue;
-               nh->nh_saddr = inet_select_addr(nh->nh_dev,
-                                               nh->nh_gw,
-                                               nh->nh_cfg_scope);
-       }
-}
-
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 
 /*

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 34921b0d3f8e7e22313056f51ce53e9f488b2e63..4b0c81180804cbe3b4290052200ebdd0102a30a5 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1718,7 +1718,7 @@ void ip_rt_get_source(u8 *addr, struct rtable *rt)
 
                rcu_read_lock();
                if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0)
-                       src = FIB_RES_PREFSRC(res);
+                       src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res);
                else
                        src = inet_select_addr(rt->dst.dev, rt->rt_gateway,
                                        RT_SCOPE_UNIVERSE);
@@ -2615,7 +2615,7 @@ static struct rtable *ip_route_output_slow(struct net *net,
                fib_select_default(&res);
 
        if (!fl4.saddr)
-               fl4.saddr = FIB_RES_PREFSRC(res);
+               fl4.saddr = FIB_RES_PREFSRC(net, res);
 
        dev_out = FIB_RES_DEV(res);
        fl4.flowi4_oif = dev_out->ifindex;
@@ -3219,6 +3219,8 @@ static __net_init int rt_genid_init(struct net *net)
 {
        get_random_bytes(&net->ipv4.rt_genid,
                         sizeof(net->ipv4.rt_genid));
+       get_random_bytes(&net->ipv4.dev_addr_genid,
+                        sizeof(net->ipv4.dev_addr_genid));
        return 0;
 }