preserve subnet routes on interface update by not putting them in the route vlist

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

diff --git a/interface-ip.c b/interface-ip.c
index 1a22980..e09a74f 100644 (file)
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -50,23 +50,33 @@ const struct config_param_list route_attr_list = {
        .params = route_attr,
 };
 
-static bool
-match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
+static void
+clear_if_addr(union if_addr *a, int mask)
 {
-       uint8_t *p1, *p2;
        int m_bytes = (mask + 7) / 8;
        uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
+       uint8_t *p = (uint8_t *) a;
 
-       p1 = alloca(m_bytes);
-       p2 = alloca(m_bytes);
+       if (m_bytes < sizeof(a))
+               memset(p + m_bytes, 0, sizeof(a) - m_bytes);
 
-       memcpy(p1, a1, m_bytes);
-       memcpy(p2, a2, m_bytes);
+       p[m_bytes - 1] &= ~m_clear;
+}
 
-       p1[m_bytes - 1] &= ~m_clear;
-       p2[m_bytes - 1] &= ~m_clear;
+static bool
+match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
+{
+       union if_addr *p1, *p2;
+
+       p1 = alloca(sizeof(*a1));
+       p2 = alloca(sizeof(*a2));
+
+       memcpy(p1, a1, sizeof(*a1));
+       clear_if_addr(p1, mask);
+       memcpy(p2, a2, sizeof(*a2));
+       clear_if_addr(p2, mask);
 
-       return !memcmp(p1, p2, m_bytes);
+       return !memcmp(p1, p2, sizeof(*p1));
 }
 
 static bool
@@ -243,6 +253,30 @@ route_cmp(const void *k1, const void *k2, void *ptr)
 }
 
 static void
+interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
+{
+       struct device *dev = iface->l3_dev.dev;
+       struct device_route route;
+
+       route.iface = iface;
+       route.flags = addr->flags;
+       route.mask = addr->mask;
+       memcpy(&route.addr, &addr->addr, sizeof(route.addr));
+       clear_if_addr(&route.addr, route.mask);
+
+       if (add) {
+               route.flags |= DEVADDR_KERNEL;
+               system_del_route(dev, &route);
+
+               route.flags &= ~DEVADDR_KERNEL;
+               route.metric = iface->metric;
+               system_add_route(dev, &route);
+       } else {
+               system_del_route(dev, &route);
+       }
+}
+
+static void
 interface_update_proto_addr(struct vlist_tree *tree,
                            struct vlist_node *node_new,
                            struct vlist_node *node_old)
@@ -286,15 +320,20 @@ interface_update_proto_addr(struct vlist_tree *tree,
        }
 
        if (node_old) {
-               if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep)
+               if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
+                       interface_handle_subnet_route(iface, a_old, false);
                        system_del_address(dev, a_old);
+               }
                free(a_old);
        }
 
        if (node_new) {
-               if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep)
-                       system_add_address(dev, a_new);
                a_new->enabled = true;
+               if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
+                       system_add_address(dev, a_new);
+                       if (iface->metric)
+                               interface_handle_subnet_route(iface, a_new, true);
+               }
        }
 }
 
@@ -337,6 +376,9 @@ interface_update_proto_route(struct vlist_tree *tree,
        if (node_new) {
                bool _enabled = enable_route(ip, route_new);
 
+               if (!(route_new->flags & DEVROUTE_METRIC))
+                       route_new->metric = iface->metric;
+
                if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
                        system_add_route(dev, route_new);
 
@@ -544,8 +586,10 @@ void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 void
 interface_ip_update_start(struct interface_ip_settings *ip)
 {
-       vlist_simple_update(&ip->dns_servers);
-       vlist_simple_update(&ip->dns_search);
+       if (ip != &ip->iface->config_ip) {
+               vlist_simple_update(&ip->dns_servers);
+               vlist_simple_update(&ip->dns_search);
+       }
        vlist_update(&ip->route);
        vlist_update(&ip->addr);
 }