[IPV4]: fib_sync_down rework.

fib_sync_down can be called with an address and with a device. In
reality it is called either with address OR with a device. The
codepath inside is completely different, so lets separate it into two
calls for these two cases.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 57 insertions, 54 deletions

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 9daa60b544ba..1b2f008db978 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -218,7 +218,8 @@ extern void fib_select_default(struct net *net, const struct flowi *flp,
 
 /* Exported by fib_semantics.c */
 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
-extern int fib_sync_down(__be32 local, struct net_device *dev, int force);
+extern int fib_sync_down_dev(struct net_device *dev, int force);
+extern int fib_sync_down_addr(__be32 local);
 extern int fib_sync_up(struct net_device *dev);
 extern __be32  __fib_res_prefsrc(struct fib_result *res);
 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index d0507f4f848a..d69ffa2a2e98 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -808,7 +808,7 @@ static void fib_del_ifaddr(struct in_ifaddr *ifa)
                            First of all, we scan fib_info list searching
                            for stray nexthop entries, then ignite fib_flush.
                         */
-                        if (fib_sync_down(ifa->ifa_local, NULL, 0))
+                        if (fib_sync_down_addr(ifa->ifa_local))
                                 fib_flush(dev->nd_net);
                 }
         }
@@ -898,7 +898,7 @@ static void nl_fib_lookup_exit(struct net *net)
 
 static void fib_disable_ip(struct net_device *dev, int force)
 {
-        if (fib_sync_down(0, dev, force))
+        if (fib_sync_down_dev(dev, force))
                 fib_flush(dev->nd_net);
         rt_cache_flush(0);
         arp_ifdown(dev);
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index c7912866d987..5beff2e02751 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -1031,70 +1031,72 @@ nla_put_failure:
      referring to it.
    - device went down -> we must shutdown all nexthops going via it.
  */
-
-int fib_sync_down(__be32 local, struct net_device *dev, int force)
+int fib_sync_down_addr(__be32 local)
 {
         int ret = 0;
-        int scope = RT_SCOPE_NOWHERE;
-
-        if (force)
-                scope = -1;
+        unsigned int hash = fib_laddr_hashfn(local);
+        struct hlist_head *head = &fib_info_laddrhash[hash];
+        struct hlist_node *node;
+        struct fib_info *fi;
 
-        if (local && fib_info_laddrhash) {
-                unsigned int hash = fib_laddr_hashfn(local);
-                struct hlist_head *head = &fib_info_laddrhash[hash];
-                struct hlist_node *node;
-                struct fib_info *fi;
+        if (fib_info_laddrhash == NULL || local == 0)
+                return 0;
 
-                hlist_for_each_entry(fi, node, head, fib_lhash) {
-                        if (fi->fib_prefsrc == local) {
-                                fi->fib_flags |= RTNH_F_DEAD;
-                                ret++;
-                        }
+        hlist_for_each_entry(fi, node, head, fib_lhash) {
+                if (fi->fib_prefsrc == local) {
+                        fi->fib_flags |= RTNH_F_DEAD;
+                        ret++;
                 }
         }
+        return ret;
+}
 
-        if (dev) {
-                struct fib_info *prev_fi = NULL;
-                unsigned int hash = fib_devindex_hashfn(dev->ifindex);
-                struct hlist_head *head = &fib_info_devhash[hash];
-                struct hlist_node *node;
-                struct fib_nh *nh;
+int fib_sync_down_dev(struct net_device *dev, int force)
+{
+        int ret = 0;
+        int scope = RT_SCOPE_NOWHERE;
+        struct fib_info *prev_fi = NULL;
+        unsigned int hash = fib_devindex_hashfn(dev->ifindex);
+        struct hlist_head *head = &fib_info_devhash[hash];
+        struct hlist_node *node;
+        struct fib_nh *nh;
 
-                hlist_for_each_entry(nh, node, head, nh_hash) {
-                        struct fib_info *fi = nh->nh_parent;
-                        int dead;
+        if (force)
+                scope = -1;
 
-                        BUG_ON(!fi->fib_nhs);
-                        if (nh->nh_dev != dev || fi == prev_fi)
-                                continue;
-                        prev_fi = fi;
-                        dead = 0;
-                        change_nexthops(fi) {
-                                if (nh->nh_flags&RTNH_F_DEAD)
-                                        dead++;
-                                else if (nh->nh_dev == dev &&
-                                         nh->nh_scope != scope) {
-                                        nh->nh_flags |= RTNH_F_DEAD;
+        hlist_for_each_entry(nh, node, head, nh_hash) {
+                struct fib_info *fi = nh->nh_parent;
+                int dead;
+
+                BUG_ON(!fi->fib_nhs);
+                if (nh->nh_dev != dev || fi == prev_fi)
+                        continue;
+                prev_fi = fi;
+                dead = 0;
+                change_nexthops(fi) {
+                        if (nh->nh_flags&RTNH_F_DEAD)
+                                dead++;
+                        else if (nh->nh_dev == dev &&
+                                        nh->nh_scope != scope) {
+                                nh->nh_flags |= RTNH_F_DEAD;
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
-                                        spin_lock_bh(&fib_multipath_lock);
-                                        fi->fib_power -= nh->nh_power;
-                                        nh->nh_power = 0;
-                                        spin_unlock_bh(&fib_multipath_lock);
+                                spin_lock_bh(&fib_multipath_lock);
+                                fi->fib_power -= nh->nh_power;
+                                nh->nh_power = 0;
+                                spin_unlock_bh(&fib_multipath_lock);
 #endif
-                                        dead++;
-                                }
+                                dead++;
+                        }
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
-                                if (force > 1 && nh->nh_dev == dev) {
-                                        dead = fi->fib_nhs;
-                                        break;
-                                }
-#endif
-                        } endfor_nexthops(fi)
-                        if (dead == fi->fib_nhs) {
-                                fi->fib_flags |= RTNH_F_DEAD;
-                                ret++;
+                        if (force > 1 && nh->nh_dev == dev) {
+                                dead = fi->fib_nhs;
+                                break;
                         }
+#endif
+                } endfor_nexthops(fi)
+                if (dead == fi->fib_nhs) {
+                        fi->fib_flags |= RTNH_F_DEAD;
+                        ret++;
                 }
         }