/* * netifd - network interface daemon * Copyright (C) 2012 Felix Fietkau * * 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 #include #include #include #include #include "netifd.h" #include "device.h" #include "interface.h" #include "interface-ip.h" #include "proto.h" #include "ubus.h" #include "system.h" enum { ROUTE_INTERFACE, ROUTE_TARGET, ROUTE_MASK, ROUTE_GATEWAY, ROUTE_METRIC, ROUTE_MTU, __ROUTE_MAX }; static const struct blobmsg_policy route_attr[__ROUTE_MAX] = { [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING }, [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING }, [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING }, [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING }, [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 }, [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 }, }; const struct config_param_list route_attr_list = { .n_params = __ROUTE_MAX, .params = route_attr, }; static void clear_if_addr(union if_addr *a, int mask) { int m_bytes = (mask + 7) / 8; uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1; uint8_t *p = (uint8_t *) a; if (m_bytes < sizeof(a)) memset(p + m_bytes, 0, sizeof(a) - m_bytes); p[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, sizeof(*p1)); } static bool __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6) { struct device_addr *addr; vlist_for_each_element(&ip->addr, addr, node) { if (!addr->enabled) continue; if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6)) continue; if (!match_if_addr(&addr->addr, a, addr->mask)) continue; return true; } return false; } static void __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a, bool v6, struct device_route **res) { struct device_route *route; vlist_for_each_element(&ip->route, route, node) { if (!route->enabled) continue; if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6)) continue; if (!match_if_addr(&route->addr, a, route->mask)) continue; if (!*res || route->mask < (*res)->mask) *res = route; } } static bool interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6) { return __find_ip_addr_target(&iface->proto_ip, a, v6) || __find_ip_addr_target(&iface->config_ip, a, v6); } static void interface_ip_find_route_target(struct interface *iface, union if_addr *a, bool v6, struct device_route **route) { __find_ip_route_target(&iface->proto_ip, a, v6, route); __find_ip_route_target(&iface->config_ip, a, v6, route); } struct interface * interface_ip_add_target_route(union if_addr *addr, bool v6) { struct interface *iface; struct device_route *route, *r_next = NULL; route = calloc(1, sizeof(*route)); if (!route) return false; route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4; route->mask = v6 ? 128 : 32; memcpy(&route->addr, addr, v6 ? sizeof(addr->in6) : sizeof(addr->in)); vlist_for_each_element(&interfaces, iface, node) { /* look for locally addressable target first */ if (interface_ip_find_addr_target(iface, addr, v6)) goto done; /* do not stop at the first route, let the lookup compare * masks to find the best match */ interface_ip_find_route_target(iface, addr, v6, &r_next); } if (!r_next) return NULL; iface = r_next->iface; memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop)); route->mtu = r_next->mtu; route->metric = r_next->metric; done: route->iface = iface; vlist_add(&iface->host_routes, &route->node, &route->flags); return iface; } void interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6) { struct interface_ip_settings *ip; struct blob_attr *tb[__ROUTE_MAX], *cur; struct device_route *route; int af = v6 ? AF_INET6 : AF_INET; blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr)); if (!iface) { if ((cur = tb[ROUTE_INTERFACE]) == NULL) return; iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node); if (!iface) return; ip = &iface->config_ip; } else { ip = &iface->proto_ip; } route = calloc(1, sizeof(*route)); if (!route) return; route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4; route->mask = v6 ? 128 : 32; if ((cur = tb[ROUTE_MASK]) != NULL) { route->mask = parse_netmask_string(blobmsg_data(cur), v6); if (route->mask > (v6 ? 128 : 32)) goto error; } if ((cur = tb[ROUTE_TARGET]) != NULL) { if (!inet_pton(af, blobmsg_data(cur), &route->addr)) { DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur)); goto error; } } if ((cur = tb[ROUTE_GATEWAY]) != NULL) { if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) { DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur)); goto error; } } if ((cur = tb[ROUTE_METRIC]) != NULL) { route->metric = blobmsg_get_u32(cur); route->flags |= DEVROUTE_METRIC; } if ((cur = tb[ROUTE_MTU]) != NULL) route->mtu = blobmsg_get_u32(cur); vlist_add(&ip->route, &route->node, &route->flags); return; error: free(route); } static int addr_cmp(const void *k1, const void *k2, void *ptr) { return memcmp(k1, k2, sizeof(struct device_addr) - offsetof(struct device_addr, flags)); } static int route_cmp(const void *k1, const void *k2, void *ptr) { return memcmp(k1, k2, sizeof(struct device_route) - offsetof(struct device_route, flags)); } 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) { struct interface_ip_settings *ip; struct interface *iface; struct device *dev; struct device_addr *a_new = NULL, *a_old = NULL; bool keep = false; ip = container_of(tree, struct interface_ip_settings, addr); iface = ip->iface; dev = iface->l3_dev.dev; if (node_new) { a_new = container_of(node_new, struct device_addr, node); if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 && !a_new->broadcast) { uint32_t mask = ~0; uint32_t *a = (uint32_t *) &a_new->addr; mask >>= a_new->mask; a_new->broadcast = *a | htonl(mask); } } if (node_old) a_old = container_of(node_old, struct device_addr, node); if (a_new && a_old) { keep = true; if (a_old->flags != a_new->flags) keep = false; if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 && a_new->broadcast != a_old->broadcast) keep = false; } if (node_old) { 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) { 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); } } } static bool enable_route(struct interface_ip_settings *ip, struct device_route *route) { if (ip->no_defaultroute && !route->mask) return false; return ip->enabled; } static void interface_update_proto_route(struct vlist_tree *tree, struct vlist_node *node_new, struct vlist_node *node_old) { struct interface_ip_settings *ip; struct interface *iface; struct device *dev; struct device_route *route_old, *route_new; bool keep = false; ip = container_of(tree, struct interface_ip_settings, route); iface = ip->iface; dev = iface->l3_dev.dev; route_old = container_of(node_old, struct device_route, node); route_new = container_of(node_new, struct device_route, node); if (node_old && node_new) keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)); if (node_old) { if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep) system_del_route(dev, route_old); free(route_old); } 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); route_new->iface = iface; route_new->enabled = _enabled; } } static void interface_update_host_route(struct vlist_tree *tree, struct vlist_node *node_new, struct vlist_node *node_old) { struct interface *iface; struct device *dev; struct device_route *route_old, *route_new; iface = container_of(tree, struct interface, host_routes); dev = iface->l3_dev.dev; route_old = container_of(node_old, struct device_route, node); route_new = container_of(node_new, struct device_route, node); if (node_old) { system_del_route(dev, route_old); free(route_old); } if (node_new) system_add_route(dev, route_new); } void interface_add_dns_server(struct interface_ip_settings *ip, const char *str) { struct dns_server *s; s = calloc(1, sizeof(*s)); s->af = AF_INET; if (inet_pton(s->af, str, &s->addr.in)) goto add; s->af = AF_INET6; if (inet_pton(s->af, str, &s->addr.in)) goto add; free(s); return; add: D(INTERFACE, "Add IPv%c DNS server: %s\n", s->af == AF_INET6 ? '6' : '4', str); vlist_simple_add(&ip->dns_servers, &s->node); } void interface_add_dns_server_list(struct interface_ip_settings *ip, 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; interface_add_dns_server(ip, blobmsg_data(cur)); } } static void interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str) { struct dns_search_domain *s; int len = strlen(str); s = calloc(1, sizeof(*s) + len + 1); if (!s) return; D(INTERFACE, "Add DNS search domain: %s\n", str); memcpy(s->name, str, len); vlist_simple_add(&ip->dns_search, &s->node); } void interface_add_dns_search_list(struct interface_ip_settings *ip, 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; interface_add_dns_search_domain(ip, blobmsg_data(cur)); } } static void write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip) { struct dns_server *s; struct dns_search_domain *d; const char *str; char buf[32]; vlist_simple_for_each_element(&ip->dns_servers, s, node) { str = inet_ntop(s->af, &s->addr, buf, sizeof(buf)); if (!str) continue; fprintf(f, "nameserver %s\n", str); } vlist_simple_for_each_element(&ip->dns_search, d, node) { fprintf(f, "search %s\n", d->name); } } void interface_write_resolv_conf(void) { struct interface *iface; char *path = alloca(strlen(resolv_conf) + 5); FILE *f; sprintf(path, "%s.tmp", resolv_conf); unlink(path); f = fopen(path, "w"); if (!f) { D(INTERFACE, "Failed to open %s for writing\n", path); return; } vlist_for_each_element(&interfaces, iface, node) { if (iface->state != IFS_UP) continue; if (vlist_simple_empty(&iface->proto_ip.dns_search) && vlist_simple_empty(&iface->proto_ip.dns_servers) && vlist_simple_empty(&iface->config_ip.dns_search) && vlist_simple_empty(&iface->config_ip.dns_servers)) continue; fprintf(f, "# Interface %s\n", iface->name); write_resolv_conf_entries(f, &iface->config_ip); if (!iface->proto_ip.no_dns) write_resolv_conf_entries(f, &iface->proto_ip); } fclose(f); if (rename(path, resolv_conf) < 0) { D(INTERFACE, "Failed to replace %s\n", resolv_conf); unlink(path); } } void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled) { struct device_addr *addr; struct device_route *route; struct device *dev; ip->enabled = enabled; dev = ip->iface->l3_dev.dev; if (!dev) return; vlist_for_each_element(&ip->addr, addr, node) { if (addr->enabled == enabled) continue; if (enabled) system_add_address(dev, addr); else system_del_address(dev, addr); addr->enabled = enabled; } vlist_for_each_element(&ip->route, route, node) { bool _enabled = enabled; if (!enable_route(ip, route)) _enabled = false; if (route->enabled == _enabled) continue; if (_enabled) { if (!(route->flags & DEVROUTE_METRIC)) route->metric = ip->iface->metric; system_add_route(dev, route); } else system_del_route(dev, route); route->enabled = _enabled; } } void interface_ip_update_start(struct interface_ip_settings *ip) { 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); } void interface_ip_update_complete(struct interface_ip_settings *ip) { vlist_simple_flush(&ip->dns_servers); vlist_simple_flush(&ip->dns_search); vlist_flush(&ip->route); vlist_flush(&ip->addr); } void interface_ip_flush(struct interface_ip_settings *ip) { if (ip == &ip->iface->proto_ip) vlist_flush_all(&ip->iface->host_routes); vlist_simple_flush_all(&ip->dns_servers); vlist_simple_flush_all(&ip->dns_search); vlist_flush_all(&ip->route); vlist_flush_all(&ip->addr); } static void __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface) { ip->iface = iface; ip->enabled = true; vlist_simple_init(&ip->dns_search, struct dns_search_domain, node); vlist_simple_init(&ip->dns_servers, struct dns_server, node); vlist_init(&ip->route, route_cmp, interface_update_proto_route); vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr); } void interface_ip_init(struct interface *iface) { __interface_ip_init(&iface->proto_ip, iface); __interface_ip_init(&iface->config_ip, iface); vlist_init(&iface->host_routes, route_cmp, interface_update_host_route); }