interface: warn if ip6hint is truncated
[project/netifd.git] / interface.c
index 6ca1d0da0be7cd61ec835a8e691a83a8a02490c2..2fa0613167ad82e4ff9db79aa7c415fd27c51a05 100644 (file)
@@ -35,6 +35,7 @@ enum {
        IFACE_ATTR_PEERDNS,
        IFACE_ATTR_DNS,
        IFACE_ATTR_DNS_SEARCH,
+       IFACE_ATTR_DNS_METRIC,
        IFACE_ATTR_METRIC,
        IFACE_ATTR_INTERFACE,
        IFACE_ATTR_IP6ASSIGN,
@@ -43,7 +44,9 @@ enum {
        IFACE_ATTR_IP6TABLE,
        IFACE_ATTR_IP6CLASS,
        IFACE_ATTR_DELEGATE,
+       IFACE_ATTR_IP6IFACEID,
        IFACE_ATTR_FORCE_LINK,
+       IFACE_ATTR_IP6WEIGHT,
        IFACE_ATTR_MAX
 };
 
@@ -56,6 +59,7 @@ static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
        [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
        [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
        [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
+       [IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
        [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
        [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
        [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
@@ -63,22 +67,23 @@ static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
        [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
        [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
        [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
+       [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
        [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
-};
-
-static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
-       [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
-       [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
+       [IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
 };
 
 const struct uci_blob_param_list interface_attr_list = {
        .n_params = IFACE_ATTR_MAX,
        .params = iface_attrs,
-       .info = iface_attr_info,
 };
 
 static void
-interface_clear_errors(struct interface *iface)
+interface_set_main_dev(struct interface *iface, struct device *dev);
+static void
+interface_event(struct interface *iface, enum interface_event ev);
+
+static void
+interface_error_flush(struct interface *iface)
 {
        struct interface_error *error, *tmp;
 
@@ -88,6 +93,17 @@ interface_clear_errors(struct interface *iface)
        }
 }
 
+static void
+interface_clear_errors(struct interface *iface)
+{
+       /* don't flush the errors in case the configured protocol handler matches the
+           running protocol handler and is having the last error capability */
+       if (!(iface->proto &&
+             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
+             (iface->proto->handler->name == iface->proto_handler->name)))
+               interface_error_flush(iface);
+}
+
 void interface_add_error(struct interface *iface, const char *subsystem,
                         const char *code, const char **data, int n_data)
 {
@@ -96,6 +112,14 @@ void interface_add_error(struct interface *iface, const char *subsystem,
        int *datalen = NULL;
        char *dest, *d_subsys, *d_code;
 
+       /* if the configured protocol handler has the last error support capability,
+           errors should only be added if the running protocol handler matches the
+           configured one */
+       if (iface->proto &&
+           (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
+           (iface->proto->handler->name != iface->proto_handler->name))
+               return;
+
        if (n_data) {
                len = n_data * sizeof(char *);
                datalen = alloca(len);
@@ -111,6 +135,11 @@ void interface_add_error(struct interface *iface, const char *subsystem,
        if (!error)
                return;
 
+       /* Only keep the last flagged error, prevent this list grows unlimitted in case the
+          protocol can't be established (e.g auth failure) */
+       if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
+               interface_error_flush(iface);
+
        list_add_tail(&error->list, &iface->errors);
 
        dest = (char *) &error->data[n_data + 1];
@@ -119,7 +148,7 @@ void interface_add_error(struct interface *iface, const char *subsystem,
                memcpy(dest, data[i], datalen[i]);
                dest += datalen[i];
        }
-       error->data[n_data++] = NULL;
+       error->data[n_data] = NULL;
 
        if (subsystem)
                error->subsystem = strcpy(d_subsys, subsystem);
@@ -164,6 +193,9 @@ interface_add_data(struct interface *iface, const struct blob_attr *data)
        }
 
        n = calloc(1, sizeof(*n) + len);
+       if (!n)
+               return UBUS_STATUS_UNKNOWN_ERROR;
+
        memcpy(n->data, data, len);
        n->node.key = blobmsg_name(n->data);
        avl_insert(&iface->data, &n->node);
@@ -172,6 +204,25 @@ interface_add_data(struct interface *iface, const struct blob_attr *data)
        return 0;
 }
 
+int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
+{
+       struct blob_attr *cur;
+       int rem, ret;
+
+       iface->updated = 0;
+
+       blob_for_each_attr(cur, attr, rem) {
+               ret = interface_add_data(iface, cur);
+               if (ret)
+                       return ret;
+       }
+
+       if (iface->updated && iface->state == IFS_UP)
+               interface_event(iface, IFEV_UPDATE);
+
+       return 0;
+}
+
 static void
 interface_event(struct interface *iface, enum interface_event ev)
 {
@@ -186,9 +237,11 @@ interface_event(struct interface *iface, enum interface_event ev)
 
        switch (ev) {
        case IFEV_UP:
+               interface_error_flush(iface);
                adev = iface->l3_dev.dev;
                /* fall through */
        case IFEV_DOWN:
+       case IFEV_UP_FAILED:
                alias_notify_device(iface->name, adev);
                break;
        default:
@@ -212,16 +265,33 @@ mark_interface_down(struct interface *iface)
        if (state == IFS_DOWN)
                return;
 
+       iface->link_up_event = false;
        iface->state = IFS_DOWN;
-       if (state == IFS_UP)
+       switch (state) {
+       case IFS_UP:
+       case IFS_TEARDOWN:
                interface_event(iface, IFEV_DOWN);
+               break;
+       case IFS_SETUP:
+               interface_event(iface, IFEV_UP_FAILED);
+               break;
+       default:
+               break;
+       }
        interface_ip_set_enabled(&iface->config_ip, false);
+       interface_ip_set_enabled(&iface->proto_ip, false);
        interface_ip_flush(&iface->proto_ip);
        interface_flush_state(iface);
        system_flush_routes();
 }
 
-void
+static inline void
+__set_config_state(struct interface *iface, enum interface_config_state s)
+{
+       iface->config_state = s;
+}
+
+static void
 __interface_set_down(struct interface *iface, bool force)
 {
        enum interface_state state = iface->state;
@@ -229,15 +299,15 @@ __interface_set_down(struct interface *iface, bool force)
        case IFS_UP:
        case IFS_SETUP:
                iface->state = IFS_TEARDOWN;
+               if (iface->dynamic)
+                       __set_config_state(iface, IFC_REMOVE);
+
                if (state == IFS_UP)
                        interface_event(iface, IFEV_DOWN);
 
                interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
                if (force)
                        interface_flush_state(iface);
-
-               if (iface->dynamic)
-                       vlist_delete(&interfaces, &iface->node);
                break;
 
        case IFS_DOWN:
@@ -271,12 +341,19 @@ interface_check_state(struct interface *iface)
 
        switch (iface->state) {
        case IFS_UP:
+       case IFS_SETUP:
                if (!iface->enabled || !link_state) {
-                       mark_interface_down(iface);
+                       iface->state = IFS_TEARDOWN;
+                       if (iface->dynamic)
+                               __set_config_state(iface, IFC_REMOVE);
+
                        interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
                }
                break;
        case IFS_DOWN:
+               if (!iface->available)
+                       return;
+
                if (iface->autostart && iface->enabled && link_state && !config_init)
                        __interface_set_up(iface);
                break;
@@ -305,32 +382,46 @@ interface_set_link_state(struct interface *iface, bool new_state)
        netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
        iface->link_state = new_state;
        interface_check_state(iface);
+
+       if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
+               interface_event(iface, IFEV_LINK_UP);
+               iface->link_up_event = true;
+       }
 }
 
 static void
-interface_cb(struct device_user *dep, enum device_event ev)
+interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
+{
+       if (ev == DEV_EVENT_REMOVE)
+               device_remove_user(dep);
+}
+
+static void
+interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 {
        struct interface *iface;
-       bool new_state = false;
 
        iface = container_of(dep, struct interface, main_dev);
        switch (ev) {
        case DEV_EVENT_ADD:
-               new_state = true;
+               interface_set_available(iface, true);
+               break;
        case DEV_EVENT_REMOVE:
-               interface_set_available(iface, new_state);
-               if (!new_state && dep->dev && dep->dev->external)
+               interface_set_available(iface, false);
+               if (dep->dev && dep->dev->external)
                        interface_set_main_dev(iface, NULL);
                break;
        case DEV_EVENT_UP:
-               new_state = true;
+               interface_set_enabled(iface, true);
+               break;
        case DEV_EVENT_DOWN:
-               interface_set_enabled(iface, new_state);
+               interface_set_enabled(iface, false);
                break;
        case DEV_EVENT_LINK_UP:
-               new_state = true;
-        case DEV_EVENT_LINK_DOWN:
-               interface_set_link_state(iface, new_state);
+               interface_set_link_state(iface, true);
+               break;
+       case DEV_EVENT_LINK_DOWN:
+               interface_set_link_state(iface, false);
                break;
        case DEV_EVENT_TOPO_CHANGE:
                interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
@@ -340,6 +431,25 @@ interface_cb(struct device_user *dep, enum device_event ev)
        }
 }
 
+static void
+interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
+{
+       struct interface *iface;
+
+       iface = container_of(dep, struct interface, l3_dev);
+       if (iface->l3_dev.dev == iface->main_dev.dev)
+               return;
+
+       switch (ev) {
+       case DEV_EVENT_LINK_DOWN:
+               if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
+                       interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
+               break;
+       default:
+               break;
+       }
+}
+
 void
 interface_set_available(struct interface *iface, bool new_state)
 {
@@ -387,7 +497,7 @@ interface_add_assignment_classes(struct interface *iface, struct blob_attr *list
                if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
                        continue;
 
-               if (!blobmsg_check_attr(cur, NULL))
+               if (!blobmsg_check_attr(cur, false))
                        continue;
 
                struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
@@ -412,12 +522,17 @@ interface_merge_assignment_data(struct interface *old, struct interface *new)
 {
        bool changed = (old->assignment_hint != new->assignment_hint ||
                        old->assignment_length != new->assignment_length ||
+                       old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
+                       old->assignment_weight != new->assignment_weight ||
+                       (old->assignment_iface_id_selection == IFID_FIXED &&
+                        memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
+                               sizeof(old->assignment_fixed_iface_id))) ||
                        list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 
        struct interface_assignment_class *c;
        list_for_each_entry(c, &new->assignment_classes, head) {
-               // Compare list entries one-by-one to see if there was a change
-               if (list_empty(&old->assignment_classes)) // The new list is longer
+               /* Compare list entries one-by-one to see if there was a change */
+               if (list_empty(&old->assignment_classes)) /* The new list is longer */
                        changed = true;
 
                if (changed)
@@ -426,14 +541,14 @@ interface_merge_assignment_data(struct interface *old, struct interface *new)
                struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
                                struct interface_assignment_class, head);
 
-               if (strcmp(c_old->name, c->name)) // An entry didn't match
+               if (strcmp(c_old->name, c->name)) /* An entry didn't match */
                        break;
 
                list_del(&c_old->head);
                free(c_old);
        }
 
-       // The old list was longer than the new one or the last entry didn't match
+       /* The old list was longer than the new one or the last entry didn't match */
        if (!list_empty(&old->assignment_classes)) {
                interface_clear_assignment_classes(old);
                changed = true;
@@ -444,6 +559,9 @@ interface_merge_assignment_data(struct interface *old, struct interface *new)
        if (changed) {
                old->assignment_hint = new->assignment_hint;
                old->assignment_length = new->assignment_length;
+               old->assignment_iface_id_selection = new->assignment_iface_id_selection;
+               old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
+               old->assignment_weight = new->assignment_weight;
                interface_refresh_assignments(true);
        }
 }
@@ -463,18 +581,33 @@ interface_alias_cb(struct interface_user *dep, struct interface *iface, enum int
                interface_set_available(alias, true);
                break;
        case IFEV_DOWN:
+       case IFEV_UP_FAILED:
                interface_set_available(alias, false);
                interface_set_main_dev(alias, NULL);
                break;
        case IFEV_FREE:
                interface_remove_user(dep);
                break;
-       case IFEV_RELOAD:
-       case IFEV_UPDATE:
+       default:
                break;
        }
 }
 
+static void
+interface_set_device_config(struct interface *iface, struct device *dev)
+{
+       if (!dev || !dev->default_config)
+               return;
+
+       if (!iface->device_config &&
+           (!dev->iface_config || dev->config_iface != iface))
+               return;
+
+       dev->config_iface = iface;
+       dev->iface_config = iface->device_config;
+       device_apply_config(dev, dev->type, iface->config);
+}
+
 static void
 interface_claim_device(struct interface *iface)
 {
@@ -484,6 +617,8 @@ interface_claim_device(struct interface *iface)
        if (iface->parent_iface.iface)
                interface_remove_user(&iface->parent_iface);
 
+       device_lock();
+
        if (iface->parent_ifname) {
                parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
                iface->parent_iface.cb = interface_alias_cb;
@@ -491,11 +626,16 @@ interface_claim_device(struct interface *iface)
        } else if (iface->ifname &&
                !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
                dev = device_get(iface->ifname, true);
+               interface_set_device_config(iface, dev);
+       } else {
+               dev = iface->ext_dev.dev;
        }
 
        if (dev)
                interface_set_main_dev(iface, dev);
 
+       device_unlock();
+
        if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
                interface_set_available(iface, true);
 }
@@ -509,8 +649,8 @@ interface_cleanup_state(struct interface *iface)
        interface_clear_errors(iface);
        interface_set_proto_state(iface, NULL);
 
-       if (iface->main_dev.dev)
-               interface_set_main_dev(iface, NULL);
+       interface_set_main_dev(iface, NULL);
+       interface_set_l3_dev(iface, NULL);
 }
 
 static void
@@ -518,6 +658,9 @@ interface_cleanup(struct interface *iface)
 {
        struct interface_user *dep, *tmp;
 
+       uloop_timeout_cancel(&iface->remove_timer);
+       device_remove_user(&iface->ext_dev);
+
        if (iface->parent_iface.iface)
                interface_remove_user(&iface->parent_iface);
 
@@ -565,19 +708,20 @@ interface_handle_config_change(struct interface *iface)
                interface_do_free(iface);
                return;
        }
-       if (iface->autostart && iface->available)
+       if (iface->autostart)
                interface_set_up(iface);
 }
 
 static void
-interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
+interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 {
        struct interface *iface = state->iface;
 
        switch (ev) {
        case IFPEV_UP:
                if (iface->state != IFS_SETUP) {
-                       interface_event(iface, IFEV_UPDATE);
+                       if (iface->state == IFS_UP && iface->updated)
+                               interface_event(iface, IFEV_UPDATE);
                        return;
                }
 
@@ -585,6 +729,7 @@ interface_proto_cb(struct interface_proto_state *state, enum interface_proto_eve
                        interface_set_l3_dev(iface, iface->main_dev.dev);
 
                interface_ip_set_enabled(&iface->config_ip, true);
+               interface_ip_set_enabled(&iface->proto_ip, true);
                system_flush_routes();
                iface->state = IFS_UP;
                iface->start_time = system_get_rtime();
@@ -629,18 +774,19 @@ void interface_set_proto_state(struct interface *iface, struct interface_proto_s
        if (!state)
                return;
 
-       state->proto_event = interface_proto_cb;
+       state->proto_event = interface_proto_event_cb;
        state->iface = iface;
 }
 
 struct interface *
-interface_alloc(const char *name, struct blob_attr *config)
+interface_alloc(const char *name, struct blob_attr *config, bool dynamic)
 {
        struct interface *iface;
        struct blob_attr *tb[IFACE_ATTR_MAX];
        struct blob_attr *cur;
        const char *proto_name = NULL;
        char *iface_name;
+       bool force_link = false;
 
        iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
        iface->name = strcpy(iface_name, name);
@@ -652,7 +798,9 @@ interface_alloc(const char *name, struct blob_attr *config)
        avl_init(&iface->data, avl_strcmp, false, NULL);
        iface->config_ip.enabled = false;
 
-       iface->main_dev.cb = interface_cb;
+       iface->main_dev.cb = interface_main_dev_cb;
+       iface->l3_dev.cb = interface_l3_dev_cb;
+       iface->ext_dev.cb = interface_ext_dev_cb;
 
        blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
                      blob_data(config), blob_len(config));
@@ -661,9 +809,12 @@ interface_alloc(const char *name, struct blob_attr *config)
                proto_name = blobmsg_data(cur);
 
        proto_attach_interface(iface, proto_name);
+       if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
+               force_link = true;
 
        iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
-       iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], false);
+       iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
+       iface->dynamic = dynamic;
        iface->proto_ip.no_defaultroute =
                !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
        iface->proto_ip.no_dns =
@@ -675,20 +826,58 @@ interface_alloc(const char *name, struct blob_attr *config)
        if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
                interface_add_dns_search_list(&iface->config_ip, cur);
 
+       if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
+               iface->dns_metric = blobmsg_get_u32(cur);
+
        if ((cur = tb[IFACE_ATTR_METRIC]))
                iface->metric = blobmsg_get_u32(cur);
 
        if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
                iface->assignment_length = blobmsg_get_u32(cur);
 
+       /* defaults */
+       iface->assignment_iface_id_selection = IFID_FIXED;
+       iface->assignment_fixed_iface_id = in6addr_any;
+       iface->assignment_fixed_iface_id.s6_addr[15] = 1;
+
+       if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
+               const char *ifaceid = blobmsg_data(cur);
+               if (!strcmp(ifaceid, "random")) {
+                       iface->assignment_iface_id_selection = IFID_RANDOM;
+               }
+               else if (!strcmp(ifaceid, "eui64")) {
+                       iface->assignment_iface_id_selection = IFID_EUI64;
+               }
+               else {
+                       /* we expect an IPv6 address with network id zero here -> fixed iface id
+                          if we cannot parse -> revert to iface id 1 */
+                       if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
+                                       iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
+                                       iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
+                               iface->assignment_fixed_iface_id = in6addr_any;
+                               iface->assignment_fixed_iface_id.s6_addr[15] = 1;
+                               netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
+                                                       falling back to iface id 1.\n", iface->name);
+                       }
+               }
+       }
+
        iface->assignment_hint = -1;
-       if ((cur = tb[IFACE_ATTR_IP6HINT]))
-               iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
-                               ~((1 << (64 - iface->assignment_length)) - 1);
+       if ((cur = tb[IFACE_ATTR_IP6HINT])) {
+               int32_t assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16);
+
+               iface->assignment_hint = assignment_hint & ~((1 << (64 - iface->assignment_length)) - 1);
+
+               if (iface->assignment_hint != assignment_hint)
+                       netifd_log_message(L_WARNING, "Using truncated assignment hint %d (0x%x) for interface '%s'\n",
+                                          iface->assignment_hint, iface->assignment_hint, iface->name);
+       }
 
        if ((cur = tb[IFACE_ATTR_IP6CLASS]))
                interface_add_assignment_classes(iface, cur);
 
+       if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
+               iface->assignment_weight = blobmsg_get_u32(cur);
 
        if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
                if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
@@ -706,16 +895,11 @@ interface_alloc(const char *name, struct blob_attr *config)
        return iface;
 }
 
-void interface_set_dynamic(struct interface *iface)
-{
-       iface->dynamic = true;
-       iface->node.version = -1; // Don't delete on reload
-}
-
 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 {
        struct blob_attr *tb[IFACE_ATTR_MAX];
        struct blob_attr *cur;
+       char *name = NULL;
 
        blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
                      blob_data(config), blob_len(config));
@@ -731,16 +915,32 @@ static bool __interface_add(struct interface *iface, struct blob_attr *config, b
                        iface->ifname = blobmsg_data(cur);
        }
 
+       if (iface->dynamic) {
+               name = strdup(iface->name);
+
+               if (!name)
+                       return false;
+       }
 
        iface->config = config;
        vlist_add(&interfaces, &iface->node, iface->name);
+
+       if (name) {
+               iface = vlist_find(&interfaces, name, iface, node);
+               free(name);
+
+               /* Don't delete dynamic interface on reload */
+               if (iface)
+                       iface->node.version = -1;
+       }
+
        return true;
 }
 
-void
+bool
 interface_add(struct interface *iface, struct blob_attr *config)
 {
-       __interface_add(iface, config, false);
+       return __interface_add(iface, config, false);
 }
 
 bool
@@ -762,17 +962,21 @@ interface_set_l3_dev(struct interface *iface, struct device *dev)
                return;
 
        interface_ip_set_enabled(&iface->config_ip, false);
+       interface_ip_set_enabled(&iface->proto_ip, false);
        interface_ip_flush(&iface->proto_ip);
        device_add_user(&iface->l3_dev, dev);
 
        if (dev) {
-               if (claimed)
-                       device_claim(&iface->l3_dev);
+               if (claimed) {
+                       if (device_claim(&iface->l3_dev) < 0)
+                               return;
+               }
                interface_ip_set_enabled(&iface->config_ip, enabled);
+               interface_ip_set_enabled(&iface->proto_ip, enabled);
        }
 }
 
-void
+static void
 interface_set_main_dev(struct interface *iface, struct device *dev)
 {
        bool claimed = iface->l3_dev.claimed;
@@ -787,14 +991,16 @@ interface_set_main_dev(struct interface *iface, struct device *dev)
                return;
        }
 
-       if (claimed)
-               device_claim(&iface->l3_dev);
+       if (claimed) {
+               if (device_claim(&iface->l3_dev) < 0)
+                       return;
+       }
 
        if (!iface->l3_dev.dev)
                interface_set_l3_dev(iface, dev);
 }
 
-int
+static int
 interface_remove_link(struct interface *iface, struct device *dev)
 {
        struct device *mdev = iface->main_dev.dev;
@@ -802,6 +1008,9 @@ interface_remove_link(struct interface *iface, struct device *dev)
        if (mdev && mdev->hotplug_ops)
                return mdev->hotplug_ops->del(mdev, dev);
 
+       if (dev == iface->ext_dev.dev)
+               device_remove_user(&iface->ext_dev);
+
        if (!iface->main_dev.hotplug)
                return UBUS_STATUS_INVALID_ARGUMENT;
 
@@ -812,8 +1021,8 @@ interface_remove_link(struct interface *iface, struct device *dev)
        return 0;
 }
 
-int
-interface_add_link(struct interface *iface, struct device *dev)
+static int
+interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 {
        struct device *mdev = iface->main_dev.dev;
 
@@ -830,32 +1039,33 @@ interface_add_link(struct interface *iface, struct device *dev)
                        return UBUS_STATUS_NOT_SUPPORTED;
        }
 
+       if (link_ext)
+               device_add_user(&iface->ext_dev, dev);
+
        interface_set_main_dev(iface, dev);
        iface->main_dev.hotplug = true;
        return 0;
 }
 
 int
-interface_handle_link(struct interface *iface, const char *name, bool add)
+interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 {
        struct device *dev;
        int ret;
 
        device_lock();
 
-       dev = device_get(name, add ? 2 : 0);
+       dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
        if (!dev) {
                ret = UBUS_STATUS_NOT_FOUND;
                goto out;
        }
 
        if (add) {
+               interface_set_device_config(iface, dev);
                device_set_present(dev, true);
-               if (iface->device_config)
-                       device_set_config(dev, &simple_device_type, iface->config);
 
-               system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
-               ret = interface_add_link(iface, dev);
+               ret = interface_add_link(iface, dev, link_ext);
        } else {
                ret = interface_remove_link(iface, dev);
        }
@@ -866,34 +1076,38 @@ out:
        return ret;
 }
 
-int
+void
 interface_set_up(struct interface *iface)
 {
        int ret;
+       const char *error = NULL;
 
        iface->autostart = true;
 
        if (iface->state != IFS_DOWN)
-               return 0;
+               return;
 
        interface_clear_errors(iface);
-       if (!iface->available) {
-               interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
-               return -1;
-       }
-
-       if (iface->main_dev.dev) {
-               ret = device_claim(&iface->main_dev);
-               if (!ret)
-                       interface_check_state(iface);
-       }
-       else
-               ret = __interface_set_up(iface);
+       if (iface->available) {
+               if (iface->main_dev.dev) {
+                       ret = device_claim(&iface->main_dev);
+                       if (!ret)
+                               interface_check_state(iface);
+                       else
+                               error = "DEVICE_CLAIM_FAILED";
+               } else {
+                       ret = __interface_set_up(iface);
+                       if (ret)
+                               error = "SETUP_FAILED";
+               }
+       } else
+               error = "NO_DEVICE";
 
-       return ret;
+       if (error)
+               interface_add_error(iface, "interface", error, NULL, 0);
 }
 
-int
+void
 interface_set_down(struct interface *iface)
 {
        if (!iface) {
@@ -903,8 +1117,15 @@ interface_set_down(struct interface *iface)
                iface->autostart = false;
                __interface_set_down(iface, false);
        }
+}
 
-       return 0;
+int
+interface_renew(struct interface *iface)
+{
+       if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
+               return -1;
+
+       return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 }
 
 void
@@ -913,7 +1134,7 @@ interface_start_pending(void)
        struct interface *iface;
 
        vlist_for_each_element(&interfaces, iface, node) {
-               if (iface->available && iface->autostart)
+               if (iface->autostart)
                        interface_set_up(iface);
        }
 }
@@ -921,7 +1142,7 @@ interface_start_pending(void)
 static void
 set_config_state(struct interface *iface, enum interface_config_state s)
 {
-       iface->config_state = s;
+       __set_config_state(iface, s);
        if (iface->state == IFS_DOWN)
                interface_handle_config_change(iface);
        else
@@ -929,10 +1150,12 @@ set_config_state(struct interface *iface, enum interface_config_state s)
 }
 
 void
-interface_update_start(struct interface *iface)
+interface_update_start(struct interface *iface, const bool keep_old)
 {
        iface->updated = 0;
-       interface_ip_update_start(&iface->proto_ip);
+
+       if (!keep_old)
+               interface_ip_update_start(&iface->proto_ip);
 }
 
 void
@@ -948,11 +1171,40 @@ interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_set
        vlist_simple_replace(&new->dns_search, &old->dns_search);
 }
 
+static bool
+interface_device_config_changed(struct interface *if_old, struct interface *if_new)
+{
+       struct blob_attr *ntb[__DEV_ATTR_MAX];
+       struct blob_attr *otb[__DEV_ATTR_MAX];
+       struct device *dev = if_old->main_dev.dev;
+       unsigned long diff = 0;
+
+       BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
+
+       if (!dev)
+               return false;
+
+       if (if_old->device_config != if_new->device_config)
+               return true;
+
+       if (!if_new->device_config)
+               return false;
+
+       blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
+               blob_data(if_old->config), blob_len(if_old->config));
+
+       blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
+               blob_data(if_new->config), blob_len(if_new->config));
+
+       uci_blob_diff(ntb, otb, &device_attr_list, &diff);
+       return diff;
+}
+
 static void
 interface_change_config(struct interface *if_old, struct interface *if_new)
 {
        struct blob_attr *old_config = if_old->config;
-       bool reload = false, reload_ip = false;
+       bool reload = false, reload_ip = false, update_prefix_delegation = false;
 
 #define FIELD_CHANGED_STR(field)                                       \
                ((!!if_old->field != !!if_new->field) ||                \
@@ -965,6 +1217,9 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
                reload = true;
        }
 
+       if (!reload && interface_device_config_changed(if_old, if_new))
+               reload = true;
+
        if (FIELD_CHANGED_STR(ifname) ||
            if_old->proto_handler != if_new->proto_handler)
                reload = true;
@@ -983,15 +1238,26 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
        })
 
        if_old->config = if_new->config;
-       if (!if_old->config_autostart && if_new->config_autostart)
-               if_old->autostart = true;
+       if (if_old->config_autostart != if_new->config_autostart) {
+               if (if_old->config_autostart)
+                       reload = true;
+
+               if_old->autostart = if_new->config_autostart;
+       }
 
        if_old->device_config = if_new->device_config;
        if_old->config_autostart = if_new->config_autostart;
        if_old->ifname = if_new->ifname;
        if_old->parent_ifname = if_new->parent_ifname;
+       if_old->dynamic = if_new->dynamic;
        if_old->proto_handler = if_new->proto_handler;
        if_old->force_link = if_new->force_link;
+       if_old->dns_metric = if_new->dns_metric;
+
+       if (if_old->proto_ip.no_delegation != if_new->proto_ip.no_delegation) {
+               if_old->proto_ip.no_delegation = if_new->proto_ip.no_delegation;
+               update_prefix_delegation = true;
+       }
 
        if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
        interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
@@ -1013,12 +1279,18 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
        }
 
        if (reload_ip) {
+               bool config_ip_enabled = if_old->config_ip.enabled;
+               bool proto_ip_enabled = if_old->proto_ip.enabled;
+
                interface_ip_set_enabled(&if_old->config_ip, false);
                interface_ip_set_enabled(&if_old->proto_ip, false);
-               interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
-               interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
+               interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
+               interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
        }
 
+       if (update_prefix_delegation)
+               interface_update_prefix_delegation(&if_old->proto_ip);
+
        interface_write_resolv_conf();
        if (if_old->main_dev.dev)
                interface_check_state(if_old);
@@ -1045,6 +1317,7 @@ interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
                set_config_state(if_old, IFC_REMOVE);
        } else if (node_new) {
                D(INTERFACE, "Create interface '%s'\n", if_new->name);
+               interface_event(if_new, IFEV_CREATE);
                proto_init_interface(if_new, if_new->config);
                interface_claim_device(if_new);
                netifd_ubus_add_interface(if_new);