/* * netifd - network interface daemon * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <string.h> #include <stdlib.h> #include <stdio.h> #include "netifd.h" #include "device.h" #include "interface.h" #include "interface-ip.h" #include "proto.h" #include "ubus.h" #include "config.h" #include "system.h" struct vlist_tree interfaces; static LIST_HEAD(iface_all_users); static unsigned int interface_serial = 0; enum { IFACE_ATTR_IFNAME, IFACE_ATTR_PROTO, IFACE_ATTR_AUTO, IFACE_ATTR_DEFAULTROUTE, IFACE_ATTR_PEERDNS, IFACE_ATTR_DNS, IFACE_ATTR_DNS_SEARCH, IFACE_ATTR_METRIC, IFACE_ATTR_INTERFACE, IFACE_ATTR_IP6ASSIGN, IFACE_ATTR_IP6HINT, IFACE_ATTR_IP4TABLE, IFACE_ATTR_IP6TABLE, IFACE_ATTR_IP6CLASS, IFACE_ATTR_DELEGATE, IFACE_ATTR_MAX }; static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = { [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING }, [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING }, [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL }, [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL }, [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL }, [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_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 }, [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING }, [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 }, }; 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 }, }; 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) { struct interface_error *error, *tmp; list_for_each_entry_safe(error, tmp, &iface->errors, list) { list_del(&error->list); free(error); } } void interface_add_error(struct interface *iface, const char *subsystem, const char *code, const char **data, int n_data) { struct interface_error *error; int i, len = 0; int *datalen = NULL; char *dest, *d_subsys, *d_code; if (n_data) { len = n_data * sizeof(char *); datalen = alloca(len); for (i = 0; i < n_data; i++) { datalen[i] = strlen(data[i]) + 1; len += datalen[i]; } } error = calloc_a(sizeof(*error) + sizeof(char *) + len, &d_subsys, subsystem ? strlen(subsystem) + 1 : 0, &d_code, code ? strlen(code) + 1 : 0); if (!error) return; list_add_tail(&error->list, &iface->errors); dest = (char *) &error->data[n_data + 1]; for (i = 0; i < n_data; i++) { error->data[i] = dest; memcpy(dest, data[i], datalen[i]); dest += datalen[i]; } error->data[n_data++] = NULL; if (subsystem) error->subsystem = strcpy(d_subsys, subsystem); if (code) error->code = strcpy(d_code, code); } static void interface_data_del(struct interface *iface, struct interface_data *data) { avl_delete(&iface->data, &data->node); free(data); } static void interface_data_flush(struct interface *iface) { struct interface_data *d, *tmp; avl_for_each_element_safe(&iface->data, d, node, tmp) interface_data_del(iface, d); } int interface_add_data(struct interface *iface, const struct blob_attr *data) { struct interface_data *n, *o; if (!blobmsg_check_attr(data, true)) return UBUS_STATUS_INVALID_ARGUMENT; n = calloc(1, sizeof(*n) + blob_pad_len(data)); memcpy(n->data, data, blob_pad_len(data)); n->node.key = blobmsg_name(n->data); o = avl_find_element(&iface->data, n->node.key, o, node); if (o) interface_data_del(iface, o); avl_insert(&iface->data, &n->node); return 0; } static void interface_event(struct interface *iface, enum interface_event ev) { struct interface_user *dep, *tmp; struct device *adev = NULL; list_for_each_entry_safe(dep, tmp, &iface->users, list) dep->cb(dep, iface, ev); list_for_each_entry_safe(dep, tmp, &iface_all_users, list) dep->cb(dep, iface, ev); switch (ev) { case IFEV_UP: adev = iface->l3_dev.dev; /* fall through */ case IFEV_DOWN: alias_notify_device(iface->name, adev); break; default: break; } } static void interface_flush_state(struct interface *iface) { if (iface->l3_dev.dev) device_release(&iface->l3_dev); interface_data_flush(iface); } static void mark_interface_down(struct interface *iface) { enum interface_state state = iface->state; iface->state = IFS_DOWN; if (state == IFS_UP) interface_event(iface, IFEV_DOWN); interface_ip_set_enabled(&iface->config_ip, false); interface_ip_flush(&iface->proto_ip); interface_flush_state(iface); system_flush_routes(); } void __interface_set_down(struct interface *iface, bool force) { if (iface->state == IFS_DOWN || iface->state == IFS_TEARDOWN) return; if (iface->state == IFS_UP) interface_event(iface, IFEV_DOWN); iface->state = IFS_TEARDOWN; interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force); if (force) interface_flush_state(iface); if (iface->dynamic) vlist_delete(&interfaces, &iface->node); } static void interface_cb(struct device_user *dep, enum device_event ev) { struct interface *iface; bool new_state; iface = container_of(dep, struct interface, main_dev); switch (ev) { case DEV_EVENT_ADD: new_state = true; break; case DEV_EVENT_REMOVE: new_state = false; break; default: return; } interface_set_available(iface, new_state); if (!new_state && dep->dev->external) interface_set_main_dev(iface, NULL); } void interface_set_available(struct interface *iface, bool new_state) { if (iface->available == new_state) return; D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state); iface->available = new_state; if (new_state) { if (iface->autostart && !config_init) interface_set_up(iface); } else __interface_set_down(iface, true); } void interface_add_user(struct interface_user *dep, struct interface *iface) { if (!iface) { list_add(&dep->list, &iface_all_users); return; } dep->iface = iface; list_add(&dep->list, &iface->users); if (iface->state == IFS_UP) dep->cb(dep, iface, IFEV_UP); } void interface_remove_user(struct interface_user *dep) { list_del_init(&dep->list); dep->iface = NULL; } static void interface_add_assignment_classes(struct interface *iface, struct blob_attr *list) { struct blob_attr *cur; int rem; blobmsg_for_each_attr(cur, list, rem) { if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING) continue; if (!blobmsg_check_attr(cur, NULL)) continue; struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur)); memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur)); list_add(&c->head, &iface->assignment_classes); } } static void interface_clear_assignment_classes(struct interface *iface) { while (!list_empty(&iface->assignment_classes)) { struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes, struct interface_assignment_class, head); list_del(&c->head); free(c); } } static void interface_merge_assignment_data(struct interface *old, struct interface *new) { bool changed = (old->assignment_hint != new->assignment_hint || old->assignment_length != new->assignment_length || 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 changed = true; if (changed) break; 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 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 if (!list_empty(&old->assignment_classes)) { interface_clear_assignment_classes(old); changed = true; } list_splice_init(&new->assignment_classes, &old->assignment_classes); if (changed) { old->assignment_hint = new->assignment_hint; old->assignment_length = new->assignment_length; interface_refresh_assignments(true); } } static void interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev) { struct interface *alias = container_of(dep, struct interface, parent_iface); struct device *dev = iface->l3_dev.dev; switch (ev) { case IFEV_UP: if (!dev) return; interface_set_main_dev(alias, dev); interface_set_available(alias, true); break; case IFEV_DOWN: 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: break; } } static void interface_claim_device(struct interface *iface) { struct interface *parent; struct device *dev = NULL; if (iface->parent_iface.iface) interface_remove_user(&iface->parent_iface); if (iface->parent_ifname) { parent = vlist_find(&interfaces, iface->parent_ifname, parent, node); iface->parent_iface.cb = interface_alias_cb; interface_add_user(&iface->parent_iface, parent); } else if (iface->ifname && !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) { dev = device_get(iface->ifname, true); } if (dev) interface_set_main_dev(iface, dev); if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE) interface_set_available(iface, true); } static void interface_cleanup_state(struct interface *iface) { interface_set_available(iface, false); interface_flush_state(iface); interface_clear_errors(iface); interface_set_proto_state(iface, NULL); if (iface->main_dev.dev) interface_set_main_dev(iface, NULL); } static void interface_cleanup(struct interface *iface) { struct interface_user *dep, *tmp; if (iface->parent_iface.iface) interface_remove_user(&iface->parent_iface); list_for_each_entry_safe(dep, tmp, &iface->users, list) interface_remove_user(dep); interface_clear_assignment_classes(iface); interface_ip_flush(&iface->config_ip); interface_cleanup_state(iface); } static void interface_do_free(struct interface *iface) { interface_event(iface, IFEV_FREE); interface_cleanup(iface); free(iface->config); netifd_ubus_remove_interface(iface); avl_delete(&interfaces.avl, &iface->node.avl); free(iface); } static void interface_do_reload(struct interface *iface) { interface_event(iface, IFEV_RELOAD); interface_cleanup_state(iface); proto_init_interface(iface, iface->config); interface_claim_device(iface); } static void interface_handle_config_change(struct interface *iface) { enum interface_config_state state = iface->config_state; iface->config_state = IFC_NORMAL; switch(state) { case IFC_NORMAL: break; case IFC_RELOAD: interface_do_reload(iface); break; case IFC_REMOVE: interface_do_free(iface); return; } if (iface->autostart && iface->available) interface_set_up(iface); } static void interface_proto_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); return; } interface_ip_set_enabled(&iface->config_ip, true); system_flush_routes(); iface->state = IFS_UP; iface->start_time = system_get_rtime(); interface_event(iface, IFEV_UP); netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name); break; case IFPEV_DOWN: if (iface->state == IFS_DOWN) return; netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name); mark_interface_down(iface); if (iface->main_dev.dev) device_release(&iface->main_dev); interface_handle_config_change(iface); break; case IFPEV_LINK_LOST: if (iface->state != IFS_UP) return; netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name); mark_interface_down(iface); iface->state = IFS_SETUP; break; } interface_write_resolv_conf(); } void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state) { if (iface->proto) { iface->proto->free(iface->proto); iface->proto = NULL; } iface->state = IFS_DOWN; iface->proto = state; if (!state) return; state->proto_event = interface_proto_cb; state->iface = iface; } struct interface * interface_alloc(const char *name, struct blob_attr *config) { struct interface *iface; struct blob_attr *tb[IFACE_ATTR_MAX]; struct blob_attr *cur; const char *proto_name = NULL; char *iface_name; iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1); iface->name = strcpy(iface_name, name); INIT_LIST_HEAD(&iface->errors); INIT_LIST_HEAD(&iface->users); INIT_LIST_HEAD(&iface->hotplug_list); INIT_LIST_HEAD(&iface->assignment_classes); interface_ip_init(iface); avl_init(&iface->data, avl_strcmp, false, NULL); iface->config_ip.enabled = false; iface->main_dev.cb = interface_cb; blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blob_data(config), blob_len(config)); if ((cur = tb[IFACE_ATTR_PROTO])) proto_name = blobmsg_data(cur); proto_attach_interface(iface, proto_name); iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true); iface->proto_ip.no_defaultroute = !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true); iface->proto_ip.no_dns = !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true); if ((cur = tb[IFACE_ATTR_DNS])) interface_add_dns_server_list(&iface->config_ip, cur); if ((cur = tb[IFACE_ATTR_DNS_SEARCH])) interface_add_dns_search_list(&iface->config_ip, 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); 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_IP6CLASS])) interface_add_assignment_classes(iface, cur); if ((cur = tb[IFACE_ATTR_IP4TABLE])) { if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table)) DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur)); } // Set a default exteranl routing table for IPv6 to do source-based-filtering struct interface *iface_old = vlist_find(&interfaces, name, iface_old, node); if (iface_old && iface_old->ip6table > 1000 && iface_old->ip6table < 2000) iface->ip6table = iface_old->ip6table; else iface->ip6table = 1000 + ++interface_serial; if ((cur = tb[IFACE_ATTR_IP6TABLE])) { if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table)) DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur)); } iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true); iface->config_autostart = iface->autostart; 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; blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blob_data(config), blob_len(config)); if (alias) { if ((cur = tb[IFACE_ATTR_INTERFACE])) iface->parent_ifname = blobmsg_data(cur); if (!iface->parent_ifname) return false; } else { if ((cur = tb[IFACE_ATTR_IFNAME])) iface->ifname = blobmsg_data(cur); } iface->config = config; vlist_add(&interfaces, &iface->node, iface->name); return true; } void interface_add(struct interface *iface, struct blob_attr *config) { __interface_add(iface, config, false); } bool interface_add_alias(struct interface *iface, struct blob_attr *config) { if (iface->proto_handler->flags & PROTO_FLAG_NODEV) return false; return __interface_add(iface, config, true); } void interface_set_l3_dev(struct interface *iface, struct device *dev) { bool enabled = iface->config_ip.enabled; bool claimed = iface->l3_dev.claimed; if (iface->l3_dev.dev == dev) return; interface_ip_set_enabled(&iface->config_ip, false); interface_ip_flush(&iface->proto_ip); device_add_user(&iface->l3_dev, dev); if (dev) { if (claimed) device_claim(&iface->l3_dev); interface_ip_set_enabled(&iface->config_ip, enabled); } } void interface_set_main_dev(struct interface *iface, struct device *dev) { bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev); bool claimed = iface->l3_dev.claimed; if (iface->main_dev.dev == dev) return; if (set_l3) interface_set_l3_dev(iface, dev); device_add_user(&iface->main_dev, dev); if (!dev) return; if (claimed) device_claim(&iface->l3_dev); if (!iface->l3_dev.dev) interface_set_l3_dev(iface, dev); } int interface_remove_link(struct interface *iface, struct device *dev) { struct device *mdev = iface->main_dev.dev; if (mdev && mdev->hotplug_ops) return mdev->hotplug_ops->del(mdev, dev); if (!iface->main_dev.hotplug) return UBUS_STATUS_INVALID_ARGUMENT; if (dev != iface->main_dev.dev) return UBUS_STATUS_INVALID_ARGUMENT; device_remove_user(&iface->main_dev); return 0; } int interface_add_link(struct interface *iface, struct device *dev) { struct device *mdev = iface->main_dev.dev; if (mdev == dev) return 0; if (iface->main_dev.hotplug) device_remove_user(&iface->main_dev); if (mdev) { if (mdev->hotplug_ops) return mdev->hotplug_ops->add(mdev, dev); else return UBUS_STATUS_NOT_SUPPORTED; } 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) { struct device *dev; int ret; device_lock(); dev = device_get(name, add ? 2 : 0); if (!dev) { ret = UBUS_STATUS_NOT_FOUND; goto out; } if (add) { 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); ret = interface_add_link(iface, dev); } else { ret = interface_remove_link(iface, dev); } out: device_unlock(); return ret; } int interface_set_up(struct interface *iface) { int ret; iface->autostart = true; if (iface->state != IFS_DOWN) return 0; 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) return ret; } iface->state = IFS_SETUP; ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false); if (ret) { mark_interface_down(iface); return ret; } return 0; } int interface_set_down(struct interface *iface) { if (!iface) { vlist_for_each_element(&interfaces, iface, node) __interface_set_down(iface, false); } else { iface->autostart = false; __interface_set_down(iface, false); } return 0; } void interface_start_pending(void) { struct interface *iface; vlist_for_each_element(&interfaces, iface, node) { if (iface->available && iface->autostart) interface_set_up(iface); } } static void set_config_state(struct interface *iface, enum interface_config_state s) { iface->config_state = s; if (iface->state == IFS_DOWN) interface_handle_config_change(iface); else __interface_set_down(iface, false); } void interface_update_start(struct interface *iface) { interface_ip_update_start(&iface->proto_ip); } void interface_update_complete(struct interface *iface) { interface_ip_update_complete(&iface->proto_ip); } static void interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old) { vlist_simple_replace(&new->dns_servers, &old->dns_servers); vlist_simple_replace(&new->dns_search, &old->dns_search); } 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; #define FIELD_CHANGED_STR(field) \ ((!!if_old->field != !!if_new->field) || \ (if_old->field && \ strcmp(if_old->field, if_new->field) != 0)) if (FIELD_CHANGED_STR(parent_ifname)) { if (if_old->parent_iface.iface) interface_remove_user(&if_old->parent_iface); reload = true; } if (FIELD_CHANGED_STR(ifname) || if_old->proto_handler != if_new->proto_handler) reload = true; if (!if_old->proto_handler->config_params) D(INTERFACE, "No config parameters for interface '%s'\n", if_old->name); else if (!uci_blob_check_equal(if_old->config, if_new->config, if_old->proto_handler->config_params)) reload = true; #define UPDATE(field, __var) ({ \ bool __changed = (if_old->field != if_new->field); \ if_old->field = if_new->field; \ __var |= __changed; \ }) if_old->config = if_new->config; if (!if_old->config_autostart && if_new->config_autostart) if_old->autostart = true; 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->proto_handler = if_new->proto_handler; if_old->proto_ip.no_dns = if_new->proto_ip.no_dns; interface_replace_dns(&if_old->config_ip, &if_new->config_ip); UPDATE(metric, reload_ip); UPDATE(proto_ip.no_defaultroute, reload_ip); UPDATE(ip4table, reload_ip); UPDATE(ip6table, reload_ip); interface_merge_assignment_data(if_old, if_new); #undef UPDATE if (reload) { D(INTERFACE, "Reload interface '%s because of config changes\n", if_old->name); interface_clear_errors(if_old); set_config_state(if_old, IFC_RELOAD); goto out; } if (reload_ip) { 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_write_resolv_conf(); out: if_new->config = NULL; interface_cleanup(if_new); free(old_config); free(if_new); } static void interface_update(struct vlist_tree *tree, struct vlist_node *node_new, struct vlist_node *node_old) { struct interface *if_old = container_of(node_old, struct interface, node); struct interface *if_new = container_of(node_new, struct interface, node); if (node_old && node_new) { D(INTERFACE, "Update interface '%s'\n", if_new->name); interface_change_config(if_old, if_new); } else if (node_old) { D(INTERFACE, "Remove interface '%s'\n", if_old->name); set_config_state(if_old, IFC_REMOVE); } else if (node_new) { D(INTERFACE, "Create interface '%s'\n", if_new->name); proto_init_interface(if_new, if_new->config); interface_claim_device(if_new); netifd_ubus_add_interface(if_new); } } static void __init interface_init_list(void) { vlist_init(&interfaces, avl_strcmp, interface_update); interfaces.keep_old = true; interfaces.no_delete = true; }