net: track link-status of ipv4 nexthops

Add a fib flag called RTNH_F_LINKDOWN to any ipv4 nexthops that are
reachable via an interface where carrier is off.  No action is taken,
but additional flags are passed to userspace to indicate carrier status.

This also includes a cleanup to fib_disable_ip to more clearly indicate
what event made the function call to replace the more cryptic force
option previously used.

v2: Split out kernel functionality into 2 patches, this patch simply
sets and clears new nexthop flag RTNH_F_LINKDOWN.

v3: Cleanups suggested by Alex as well as a bug noticed in
fib_sync_down_dev and fib_sync_up when multipath was not enabled.

v5: Whitespace and variable declaration fixups suggested by Dave.

v6: Style fixups noticed by Dave; ran checkpatch to be sure I got them
all.

Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: Dinesh Dutt <ddutt@cumulusnetworks.com>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 47 insertions, 13 deletions

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 28ec3c1823bf..b1b305b1e340 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -266,7 +266,7 @@ static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
 #ifdef CONFIG_IP_ROUTE_CLASSID
                     nh->nh_tclassid != onh->nh_tclassid ||
 #endif
-                    ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_F_DEAD))
+                    ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK))
                         return -1;
                 onh++;
         } endfor_nexthops(fi);
@@ -318,7 +318,7 @@ static struct fib_info *fib_find_info(const struct fib_info *nfi)
                     nfi->fib_type == fi->fib_type &&
                     memcmp(nfi->fib_metrics, fi->fib_metrics,
                            sizeof(u32) * RTAX_MAX) == 0 &&
-                    ((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_F_DEAD) == 0 &&
+                    !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) &&
                     (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
                         return fi;
         }
@@ -604,6 +604,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
                                 return -ENODEV;
                         if (!(dev->flags & IFF_UP))
                                 return -ENETDOWN;
+                        if (!netif_carrier_ok(dev))
+                                nh->nh_flags |= RTNH_F_LINKDOWN;
                         nh->nh_dev = dev;
                         dev_hold(dev);
                         nh->nh_scope = RT_SCOPE_LINK;
@@ -636,6 +638,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
                 if (!dev)
                         goto out;
                 dev_hold(dev);
+                if (!netif_carrier_ok(dev))
+                        nh->nh_flags |= RTNH_F_LINKDOWN;
                 err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN;
         } else {
                 struct in_device *in_dev;
@@ -654,6 +658,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
                 nh->nh_dev = in_dev->dev;
                 dev_hold(nh->nh_dev);
                 nh->nh_scope = RT_SCOPE_HOST;
+                if (!netif_carrier_ok(nh->nh_dev))
+                        nh->nh_flags |= RTNH_F_LINKDOWN;
                 err = 0;
         }
 out:
@@ -920,11 +926,17 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
                 if (!nh->nh_dev)
                         goto failure;
         } else {
+                int linkdown = 0;
+
                 change_nexthops(fi) {
                         err = fib_check_nh(cfg, fi, nexthop_nh);
                         if (err != 0)
                                 goto failure;
+                        if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN)
+                                linkdown++;
                 } endfor_nexthops(fi)
+                if (linkdown == fi->fib_nhs)
+                        fi->fib_flags |= RTNH_F_LINKDOWN;
         }
 
         if (fi->fib_prefsrc) {
@@ -1103,7 +1115,7 @@ int fib_sync_down_addr(struct net *net, __be32 local)
         return ret;
 }
 
-int fib_sync_down_dev(struct net_device *dev, int force)
+int fib_sync_down_dev(struct net_device *dev, unsigned long event)
 {
         int ret = 0;
         int scope = RT_SCOPE_NOWHERE;
@@ -1112,7 +1124,8 @@ int fib_sync_down_dev(struct net_device *dev, int force)
         struct hlist_head *head = &fib_info_devhash[hash];
         struct fib_nh *nh;
 
-        if (force)
+        if (event == NETDEV_UNREGISTER ||
+            event == NETDEV_DOWN)
                 scope = -1;
 
         hlist_for_each_entry(nh, head, nh_hash) {
@@ -1129,7 +1142,15 @@ int fib_sync_down_dev(struct net_device *dev, int force)
                                 dead++;
                         else if (nexthop_nh->nh_dev == dev &&
                                  nexthop_nh->nh_scope != scope) {
-                                nexthop_nh->nh_flags |= RTNH_F_DEAD;
+                                switch (event) {
+                                case NETDEV_DOWN:
+                                case NETDEV_UNREGISTER:
+                                        nexthop_nh->nh_flags |= RTNH_F_DEAD;
+                                        /* fall through */
+                                case NETDEV_CHANGE:
+                                        nexthop_nh->nh_flags |= RTNH_F_LINKDOWN;
+                                        break;
+                                }
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
                                 spin_lock_bh(&fib_multipath_lock);
                                 fi->fib_power -= nexthop_nh->nh_power;
@@ -1139,14 +1160,23 @@ int fib_sync_down_dev(struct net_device *dev, int force)
                                 dead++;
                         }
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
-                        if (force > 1 && nexthop_nh->nh_dev == dev) {
+                        if (event == NETDEV_UNREGISTER &&
+                            nexthop_nh->nh_dev == dev) {
                                 dead = fi->fib_nhs;
                                 break;
                         }
 #endif
                 } endfor_nexthops(fi)
                 if (dead == fi->fib_nhs) {
-                        fi->fib_flags |= RTNH_F_DEAD;
+                        switch (event) {
+                        case NETDEV_DOWN:
+                        case NETDEV_UNREGISTER:
+                                fi->fib_flags |= RTNH_F_DEAD;
+                                /* fall through */
+                        case NETDEV_CHANGE:
+                                fi->fib_flags |= RTNH_F_LINKDOWN;
+                                break;
+                        }
                         ret++;
                 }
         }
@@ -1210,13 +1240,11 @@ out:
         return;
 }
 
-#ifdef CONFIG_IP_ROUTE_MULTIPATH
-
 /*
  * Dead device goes up. We wake up dead nexthops.
  * It takes sense only on multipath routes.
  */
-int fib_sync_up(struct net_device *dev)
+int fib_sync_up(struct net_device *dev, unsigned int nh_flags)
 {
         struct fib_info *prev_fi;
         unsigned int hash;
@@ -1243,7 +1271,7 @@ int fib_sync_up(struct net_device *dev)
                 prev_fi = fi;
                 alive = 0;
                 change_nexthops(fi) {
-                        if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) {
+                        if (!(nexthop_nh->nh_flags & nh_flags)) {
                                 alive++;
                                 continue;
                         }
@@ -1254,14 +1282,18 @@ int fib_sync_up(struct net_device *dev)
                             !__in_dev_get_rtnl(dev))
                                 continue;
                         alive++;
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
                         spin_lock_bh(&fib_multipath_lock);
                         nexthop_nh->nh_power = 0;
-                        nexthop_nh->nh_flags &= ~RTNH_F_DEAD;
+                        nexthop_nh->nh_flags &= ~nh_flags;
                         spin_unlock_bh(&fib_multipath_lock);
+#else
+                        nexthop_nh->nh_flags &= ~nh_flags;
+#endif
                 } endfor_nexthops(fi)
 
                 if (alive > 0) {
-                        fi->fib_flags &= ~RTNH_F_DEAD;
+                        fi->fib_flags &= ~nh_flags;
                         ret++;
                 }
         }
@@ -1269,6 +1301,8 @@ int fib_sync_up(struct net_device *dev)
         return ret;
 }
 
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+
 /*
  * The algorithm is suboptimal, but it provides really
  * fair weighted route distribution.