Don't add unnecessary NOP policy rules

[project/netifd.git] / interface-ip.c

diff --git a/interface-ip.c b/interface-ip.c
index a6a7dca..59cf828 100644 (file)
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -499,15 +499,18 @@ interface_update_proto_addr(struct vlist_tree *tree,
                        if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
                                v6 = true;
 
+                       unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
+
                        //This is needed for source routing to work correctly. If a device
                        //has two connections to a network using the same subnet, adding
                        //only the network-rule will cause packets to be routed through the
                        //first matching network (source IP matches both masks).
-                       set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
-                               (v6) ? 128 : 32, (v6) ? iface->ip6table : iface->ip4table,
-                                               NULL, NULL);
-                       set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
-                               a_old->mask, (v6) ? iface->ip6table : iface->ip4table, NULL, NULL);
+                       if (table) {
+                               set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
+                                               (v6) ? 128 : 32, table, NULL, NULL);
+                               set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
+                                               a_old->mask, table, NULL, NULL);
+                       }
 
                        system_del_address(dev, a_old);
                }
@@ -524,12 +527,14 @@ interface_update_proto_addr(struct vlist_tree *tree,
                                if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
                                        v6 = true;
 
-                               set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
-                                       (v6) ? 128 : 32, (v6) ? iface->ip6table : iface->ip4table,
-                                                       NULL, NULL);
-                               set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
-                                       a_new->mask, (v6) ? iface->ip6table : iface->ip4table,
-                                                       NULL, NULL);
+                               unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
+
+                               if (table) {
+                                       set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
+                                                       (v6) ? 128 : 32, table, NULL, NULL);
+                                       set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
+                                                       a_new->mask, table, NULL, NULL);
+                               }
                        }
 
                        if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
@@ -645,8 +650,9 @@ interface_set_prefix_address(struct device_prefix_assignment *assignment,
                        addr.valid_until = now + 7200;
                system_add_address(l3_downlink, &addr);
                if (prefix->iface) {
-                       set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
-                                       addr.mask, prefix->iface->ip6table, iface, NULL);
+                       if (prefix->iface->ip6table)
+                               set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
+                                               addr.mask, prefix->iface->ip6table, iface, NULL);
 
                        set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
                                                        addr.mask, 0, iface, "unreachable");
@@ -659,8 +665,9 @@ interface_set_prefix_address(struct device_prefix_assignment *assignment,
                        set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
                                        addr.mask, 0, iface, "unreachable");
 
-                       set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
-                                       addr.mask, prefix->iface->ip6table, iface, NULL);
+                       if (prefix->iface->ip6table)
+                               set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
+                                               addr.mask, prefix->iface->ip6table, iface, NULL);
                }
                if (uplink && uplink->l3_dev.dev) {
                        int mtu = system_update_ipv6_mtu(