/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include "alloc-util.h" #include "event-util.h" #include "netlink-util.h" #include "networkd-address.h" #include "networkd-ipv4ll.h" #include "networkd-manager.h" #include "networkd-network.h" #include "networkd-nexthop.h" #include "networkd-queue.h" #include "networkd-route-util.h" #include "networkd-route.h" #include "parse-util.h" #include "string-util.h" #include "strv.h" #include "vrf.h" #include "wireguard.h" int route_new(Route **ret) { _cleanup_(route_freep) Route *route = NULL; route = new(Route, 1); if (!route) return -ENOMEM; *route = (Route) { .family = AF_UNSPEC, .scope = RT_SCOPE_UNIVERSE, .protocol = RTPROT_UNSPEC, .type = RTN_UNICAST, .table = RT_TABLE_MAIN, .lifetime_usec = USEC_INFINITY, .quickack = -1, .fast_open_no_cookie = -1, .gateway_onlink = -1, .ttl_propagate = -1, }; *ret = TAKE_PTR(route); return 0; } static int route_new_static(Network *network, const char *filename, unsigned section_line, Route **ret) { _cleanup_(config_section_freep) ConfigSection *n = NULL; _cleanup_(route_freep) Route *route = NULL; int r; assert(network); assert(ret); assert(filename); assert(section_line > 0); r = config_section_new(filename, section_line, &n); if (r < 0) return r; route = hashmap_get(network->routes_by_section, n); if (route) { *ret = TAKE_PTR(route); return 0; } if (hashmap_size(network->routes_by_section) >= routes_max()) return -E2BIG; r = route_new(&route); if (r < 0) return r; route->protocol = RTPROT_STATIC; route->network = network; route->section = TAKE_PTR(n); route->source = NETWORK_CONFIG_SOURCE_STATIC; r = hashmap_ensure_put(&network->routes_by_section, &config_section_hash_ops, route->section, route); if (r < 0) return r; *ret = TAKE_PTR(route); return 0; } Route *route_free(Route *route) { if (!route) return NULL; if (route->network) { assert(route->section); hashmap_remove(route->network->routes_by_section, route->section); } config_section_free(route->section); if (route->link) set_remove(route->link->routes, route); if (route->manager) set_remove(route->manager->routes, route); ordered_set_free_with_destructor(route->multipath_routes, multipath_route_free); sd_event_source_disable_unref(route->expire); return mfree(route); } static void route_hash_func(const Route *route, struct siphash *state) { assert(route); siphash24_compress(&route->family, sizeof(route->family), state); switch (route->family) { case AF_INET: case AF_INET6: siphash24_compress(&route->dst_prefixlen, sizeof(route->dst_prefixlen), state); siphash24_compress(&route->dst, FAMILY_ADDRESS_SIZE(route->family), state); siphash24_compress(&route->src_prefixlen, sizeof(route->src_prefixlen), state); siphash24_compress(&route->src, FAMILY_ADDRESS_SIZE(route->family), state); siphash24_compress(&route->gw_family, sizeof(route->gw_family), state); if (IN_SET(route->gw_family, AF_INET, AF_INET6)) { siphash24_compress(&route->gw, FAMILY_ADDRESS_SIZE(route->gw_family), state); siphash24_compress(&route->gw_weight, sizeof(route->gw_weight), state); } siphash24_compress(&route->prefsrc, FAMILY_ADDRESS_SIZE(route->family), state); siphash24_compress(&route->tos, sizeof(route->tos), state); siphash24_compress(&route->priority, sizeof(route->priority), state); siphash24_compress(&route->table, sizeof(route->table), state); siphash24_compress(&route->protocol, sizeof(route->protocol), state); siphash24_compress(&route->scope, sizeof(route->scope), state); siphash24_compress(&route->type, sizeof(route->type), state); siphash24_compress(&route->initcwnd, sizeof(route->initcwnd), state); siphash24_compress(&route->initrwnd, sizeof(route->initrwnd), state); siphash24_compress(&route->advmss, sizeof(route->advmss), state); siphash24_compress(&route->nexthop_id, sizeof(route->nexthop_id), state); break; default: /* treat any other address family as AF_UNSPEC */ break; } } static int route_compare_func(const Route *a, const Route *b) { int r; r = CMP(a->family, b->family); if (r != 0) return r; switch (a->family) { case AF_INET: case AF_INET6: r = CMP(a->dst_prefixlen, b->dst_prefixlen); if (r != 0) return r; r = memcmp(&a->dst, &b->dst, FAMILY_ADDRESS_SIZE(a->family)); if (r != 0) return r; r = CMP(a->src_prefixlen, b->src_prefixlen); if (r != 0) return r; r = memcmp(&a->src, &b->src, FAMILY_ADDRESS_SIZE(a->family)); if (r != 0) return r; r = CMP(a->gw_family, b->gw_family); if (r != 0) return r; if (IN_SET(a->gw_family, AF_INET, AF_INET6)) { r = memcmp(&a->gw, &b->gw, FAMILY_ADDRESS_SIZE(a->family)); if (r != 0) return r; r = CMP(a->gw_weight, b->gw_weight); if (r != 0) return r; } r = memcmp(&a->prefsrc, &b->prefsrc, FAMILY_ADDRESS_SIZE(a->family)); if (r != 0) return r; r = CMP(a->tos, b->tos); if (r != 0) return r; r = CMP(a->priority, b->priority); if (r != 0) return r; r = CMP(a->table, b->table); if (r != 0) return r; r = CMP(a->protocol, b->protocol); if (r != 0) return r; r = CMP(a->scope, b->scope); if (r != 0) return r; r = CMP(a->type, b->type); if (r != 0) return r; r = CMP(a->initcwnd, b->initcwnd); if (r != 0) return r; r = CMP(a->initrwnd, b->initrwnd); if (r != 0) return r; r = CMP(a->advmss, b->advmss); if (r != 0) return r; r = CMP(a->nexthop_id, b->nexthop_id); if (r != 0) return r; return 0; default: /* treat any other address family as AF_UNSPEC */ return 0; } } DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR( route_hash_ops, Route, route_hash_func, route_compare_func, route_free); static bool route_type_is_reject(const Route *route) { assert(route); return IN_SET(route->type, RTN_UNREACHABLE, RTN_PROHIBIT, RTN_BLACKHOLE, RTN_THROW); } static bool route_needs_convert(const Route *route) { assert(route); return route->nexthop_id > 0 || !ordered_set_isempty(route->multipath_routes); } static int route_add(Manager *manager, Link *link, Route *route) { int r; assert(route); if (route_type_is_reject(route)) { assert(manager); r = set_ensure_put(&manager->routes, &route_hash_ops, route); if (r < 0) return r; if (r == 0) return -EEXIST; route->manager = manager; } else { assert(link); r = set_ensure_put(&link->routes, &route_hash_ops, route); if (r < 0) return r; if (r == 0) return -EEXIST; route->link = link; } return 0; } int route_get(Manager *manager, Link *link, const Route *in, Route **ret) { Route *route; assert(in); if (route_type_is_reject(in)) { if (!manager) return -ENOENT; route = set_get(manager->routes, in); } else { if (!link) return -ENOENT; route = set_get(link->routes, in); } if (!route) return -ENOENT; if (ret) *ret = route; return 0; } int route_dup(const Route *src, Route **ret) { _cleanup_(route_freep) Route *dest = NULL; /* This does not copy mulipath routes. */ assert(src); assert(ret); dest = newdup(Route, src, 1); if (!dest) return -ENOMEM; /* Unset all pointers */ dest->network = NULL; dest->section = NULL; dest->link = NULL; dest->manager = NULL; dest->multipath_routes = NULL; dest->expire = NULL; *ret = TAKE_PTR(dest); return 0; } static void route_apply_nexthop(Route *route, const NextHop *nh, uint8_t nh_weight) { assert(route); assert(nh); assert(hashmap_isempty(nh->group)); route->gw_family = nh->family; route->gw = nh->gw; if (nh_weight != UINT8_MAX) route->gw_weight = nh_weight; if (nh->blackhole) route->type = RTN_BLACKHOLE; } static void route_apply_multipath_route(Route *route, const MultipathRoute *m) { assert(route); assert(m); route->gw_family = m->gateway.family; route->gw = m->gateway.address; route->gw_weight = m->weight; } static int multipath_route_get_link(Manager *manager, const MultipathRoute *m, Link **ret) { int r; assert(manager); assert(m); if (m->ifname) { r = link_get_by_name(manager, m->ifname, ret); return r < 0 ? r : 1; } else if (m->ifindex > 0) { /* Always ignore ifindex if ifname is set. */ r = link_get_by_index(manager, m->ifindex, ret); return r < 0 ? r : 1; } if (ret) *ret = NULL; return 0; } typedef struct ConvertedRoutes { size_t n; Route **routes; Link **links; } ConvertedRoutes; static ConvertedRoutes *converted_routes_free(ConvertedRoutes *c) { if (!c) return NULL; for (size_t i = 0; i < c->n; i++) route_free(c->routes[i]); free(c->routes); free(c->links); return mfree(c); } DEFINE_TRIVIAL_CLEANUP_FUNC(ConvertedRoutes*, converted_routes_free); static int converted_routes_new(size_t n, ConvertedRoutes **ret) { _cleanup_(converted_routes_freep) ConvertedRoutes *c = NULL; _cleanup_free_ Route **routes = NULL; _cleanup_free_ Link **links = NULL; assert(n > 0); assert(ret); routes = new0(Route*, n); if (!routes) return -ENOMEM; links = new0(Link*, n); if (!links) return -ENOMEM; c = new(ConvertedRoutes, 1); if (!c) return -ENOMEM; *c = (ConvertedRoutes) { .n = n, .routes = TAKE_PTR(routes), .links = TAKE_PTR(links), }; *ret = TAKE_PTR(c); return 0; } static int route_convert(Manager *manager, const Route *route, ConvertedRoutes **ret) { _cleanup_(converted_routes_freep) ConvertedRoutes *c = NULL; int r; assert(manager); assert(route); assert(ret); if (!route_needs_convert(route)) { *ret = NULL; return 0; } if (route->nexthop_id > 0) { struct nexthop_grp *nhg; NextHop *nh; r = manager_get_nexthop_by_id(manager, route->nexthop_id, &nh); if (r < 0) return r; if (hashmap_isempty(nh->group)) { r = converted_routes_new(1, &c); if (r < 0) return r; r = route_dup(route, &c->routes[0]); if (r < 0) return r; route_apply_nexthop(c->routes[0], nh, UINT8_MAX); c->links[0] = nh->link; *ret = TAKE_PTR(c); return 1; } r = converted_routes_new(hashmap_size(nh->group), &c); if (r < 0) return r; size_t i = 0; HASHMAP_FOREACH(nhg, nh->group) { NextHop *h; r = manager_get_nexthop_by_id(manager, nhg->id, &h); if (r < 0) return r; r = route_dup(route, &c->routes[i]); if (r < 0) return r; route_apply_nexthop(c->routes[i], h, nhg->weight); c->links[i] = h->link; i++; } *ret = TAKE_PTR(c); return 1; } assert(!ordered_set_isempty(route->multipath_routes)); r = converted_routes_new(ordered_set_size(route->multipath_routes), &c); if (r < 0) return r; size_t i = 0; MultipathRoute *m; ORDERED_SET_FOREACH(m, route->multipath_routes) { r = route_dup(route, &c->routes[i]); if (r < 0) return r; route_apply_multipath_route(c->routes[i], m); r = multipath_route_get_link(manager, m, &c->links[i]); if (r < 0) return r; i++; } *ret = TAKE_PTR(c); return 1; } void link_mark_routes(Link *link, NetworkConfigSource source, const struct in6_addr *router) { Route *route; assert(link); SET_FOREACH(route, link->routes) { if (route->source != source) continue; if (source == NETWORK_CONFIG_SOURCE_NDISC && router && !in6_addr_equal(router, &route->provider.in6)) continue; route_mark(route); } } static void log_route_debug(const Route *route, const char *str, const Link *link, const Manager *manager) { _cleanup_free_ char *state = NULL, *dst = NULL, *src = NULL, *gw_alloc = NULL, *prefsrc = NULL, *table = NULL, *scope = NULL, *proto = NULL, *flags = NULL; const char *gw = NULL; assert(route); assert(str); assert(manager); /* link may be NULL. */ if (!DEBUG_LOGGING) return; (void) network_config_state_to_string_alloc(route->state, &state); if (in_addr_is_set(route->family, &route->dst) || route->dst_prefixlen > 0) (void) in_addr_prefix_to_string(route->family, &route->dst, route->dst_prefixlen, &dst); if (in_addr_is_set(route->family, &route->src) || route->src_prefixlen > 0) (void) in_addr_prefix_to_string(route->family, &route->src, route->src_prefixlen, &src); if (in_addr_is_set(route->gw_family, &route->gw)) { (void) in_addr_to_string(route->gw_family, &route->gw, &gw_alloc); gw = gw_alloc; } else if (route->gateway_from_dhcp_or_ra) { if (route->gw_family == AF_INET) gw = "_dhcp4"; else if (route->gw_family == AF_INET6) gw = "_ipv6ra"; } else { MultipathRoute *m; ORDERED_SET_FOREACH(m, route->multipath_routes) { _cleanup_free_ char *buf = NULL; union in_addr_union a = m->gateway.address; (void) in_addr_to_string(m->gateway.family, &a, &buf); (void) strextend_with_separator(&gw_alloc, ",", strna(buf)); if (m->ifname) (void) strextend(&gw_alloc, "@", m->ifname); else if (m->ifindex > 0) (void) strextendf(&gw_alloc, "@%"PRIu32, m->ifindex); /* See comments in config_parse_multipath_route(). */ (void) strextendf(&gw_alloc, ":%"PRIu32, m->weight + 1); } gw = gw_alloc; } if (in_addr_is_set(route->family, &route->prefsrc)) (void) in_addr_to_string(route->family, &route->prefsrc, &prefsrc); (void) route_scope_to_string_alloc(route->scope, &scope); (void) manager_get_route_table_to_string(manager, route->table, &table); (void) route_protocol_full_to_string_alloc(route->protocol, &proto); (void) route_flags_to_string_alloc(route->flags, &flags); log_link_debug(link, "%s %s route (%s): dst: %s, src: %s, gw: %s, prefsrc: %s, scope: %s, table: %s, " "proto: %s, type: %s, nexthop: %"PRIu32", priority: %"PRIu32", flags: %s", str, strna(network_config_source_to_string(route->source)), strna(state), strna(dst), strna(src), strna(gw), strna(prefsrc), strna(scope), strna(table), strna(proto), strna(route_type_to_string(route->type)), route->nexthop_id, route->priority, strna(flags)); } static int route_set_netlink_message(const Route *route, sd_netlink_message *req, Link *link) { int r; assert(route); assert(req); /* link may be NULL */ if (in_addr_is_set(route->gw_family, &route->gw) && route->nexthop_id == 0) { if (route->gw_family == route->family) { r = netlink_message_append_in_addr_union(req, RTA_GATEWAY, route->gw_family, &route->gw); if (r < 0) return r; } else { RouteVia rtvia = { .family = route->gw_family, .address = route->gw, }; r = sd_netlink_message_append_data(req, RTA_VIA, &rtvia, sizeof(rtvia)); if (r < 0) return r; } } if (route->dst_prefixlen > 0) { r = netlink_message_append_in_addr_union(req, RTA_DST, route->family, &route->dst); if (r < 0) return r; r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen); if (r < 0) return r; } if (route->src_prefixlen > 0) { r = netlink_message_append_in_addr_union(req, RTA_SRC, route->family, &route->src); if (r < 0) return r; r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen); if (r < 0) return r; } if (in_addr_is_set(route->family, &route->prefsrc)) { r = netlink_message_append_in_addr_union(req, RTA_PREFSRC, route->family, &route->prefsrc); if (r < 0) return r; } r = sd_rtnl_message_route_set_scope(req, route->scope); if (r < 0) return r; r = sd_rtnl_message_route_set_flags(req, route->flags & RTNH_F_ONLINK); if (r < 0) return r; if (route->table < 256) { r = sd_rtnl_message_route_set_table(req, route->table); if (r < 0) return r; } else { r = sd_rtnl_message_route_set_table(req, RT_TABLE_UNSPEC); if (r < 0) return r; /* Table attribute to allow more than 256. */ r = sd_netlink_message_append_u32(req, RTA_TABLE, route->table); if (r < 0) return r; } if (!route_type_is_reject(route) && route->nexthop_id == 0 && ordered_set_isempty(route->multipath_routes)) { assert(link); /* Those routes must be attached to a specific link */ r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex); if (r < 0) return r; } if (route->nexthop_id > 0) { r = sd_netlink_message_append_u32(req, RTA_NH_ID, route->nexthop_id); if (r < 0) return r; } r = sd_netlink_message_append_u8(req, RTA_PREF, route->pref); if (r < 0) return r; r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority); if (r < 0) return r; return 0; } static int route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(m); /* link may be NULL. */ if (link && IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 0; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -ESRCH) log_link_message_warning_errno(link, m, r, "Could not drop route, ignoring"); return 1; } int route_remove(Route *route) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; unsigned char type; Manager *manager; Link *link; int r; assert(route); assert(route->manager || (route->link && route->link->manager)); assert(IN_SET(route->family, AF_INET, AF_INET6)); link = route->link; manager = route->manager ?: link->manager; log_route_debug(route, "Removing", link, manager); r = sd_rtnl_message_new_route(manager->rtnl, &req, RTM_DELROUTE, route->family, route->protocol); if (r < 0) return log_link_error_errno(link, r, "Could not create netlink message: %m"); if (route->family == AF_INET && route->nexthop_id > 0 && route->type == RTN_BLACKHOLE) /* When IPv4 route has nexthop id and the nexthop type is blackhole, even though kernel * sends RTM_NEWROUTE netlink message with blackhole type, kernel's internal route type * fib_rt_info::type may not be blackhole. Thus, we cannot know the internal value. * Moreover, on route removal, the matching is done with the hidden value if we set * non-zero type in RTM_DELROUTE message. Note, sd_rtnl_message_new_route() sets * RTN_UNICAST by default. So, we need to clear the type here. */ type = RTN_UNSPEC; else type = route->type; r = sd_rtnl_message_route_set_type(req, type); if (r < 0) return log_link_error_errno(link, r, "Could not set route type: %m"); r = route_set_netlink_message(route, req, link); if (r < 0) return log_error_errno(r, "Could not fill netlink message: %m"); r = netlink_call_async(manager->rtnl, NULL, req, route_remove_handler, link ? link_netlink_destroy_callback : NULL, link); if (r < 0) return log_link_error_errno(link, r, "Could not send netlink message: %m"); link_ref(link); route_enter_removing(route); return 0; } static void manager_mark_routes(Manager *manager, bool foreign, const Link *except) { Route *route; Link *link; int r; assert(manager); /* First, mark all routes. */ SET_FOREACH(route, manager->routes) { /* Do not touch routes managed by the kernel. */ if (route->protocol == RTPROT_KERNEL) continue; /* When 'foreign' is true, mark only foreign routes, and vice versa. */ if (foreign != (route->source == NETWORK_CONFIG_SOURCE_FOREIGN)) continue; /* Do not touch dynamic routes. They will removed by dhcp_pd_prefix_lost() */ if (IN_SET(route->source, NETWORK_CONFIG_SOURCE_DHCP4, NETWORK_CONFIG_SOURCE_DHCP6)) continue; /* Ignore routes not assigned yet or already removed. */ if (!route_exists(route)) continue; route_mark(route); } /* Then, unmark all routes requested by active links. */ HASHMAP_FOREACH(link, manager->links_by_index) { if (link == except) continue; if (!link->network) continue; if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) continue; HASHMAP_FOREACH(route, link->network->routes_by_section) { _cleanup_(converted_routes_freep) ConvertedRoutes *converted = NULL; Route *existing; r = route_convert(manager, route, &converted); if (r < 0) continue; if (r == 0) { if (route_get(manager, NULL, route, &existing) >= 0) route_unmark(existing); continue; } for (size_t i = 0; i < converted->n; i++) if (route_get(manager, NULL, converted->routes[i], &existing) >= 0) route_unmark(existing); } } } static int manager_drop_marked_routes(Manager *manager) { Route *route; int k, r = 0; assert(manager); SET_FOREACH(route, manager->routes) { if (!route_is_marked(route)) continue; k = route_remove(route); if (k < 0 && r >= 0) r = k; } return r; } static bool route_by_kernel(const Route *route) { assert(route); if (route->protocol == RTPROT_KERNEL) return true; /* The kernels older than a826b04303a40d52439aa141035fca5654ccaccd (v5.11) create the IPv6 * multicast with RTPROT_BOOT. Do not touch it. */ if (route->protocol == RTPROT_BOOT && route->family == AF_INET6 && route->dst_prefixlen == 8 && in6_addr_equal(&route->dst.in6, & (struct in6_addr) {{{ 0xff,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }}})) return true; return false; } static void link_unmark_wireguard_routes(Link *link) { Route *route, *existing; Wireguard *w; assert(link); w = WIREGUARD(link->netdev); if (!w) return; SET_FOREACH(route, w->routes) if (route_get(NULL, link, route, &existing) >= 0) route_unmark(existing); } int link_drop_foreign_routes(Link *link) { Route *route; int k, r; assert(link); assert(link->manager); assert(link->network); SET_FOREACH(route, link->routes) { /* do not touch routes managed by the kernel */ if (route_by_kernel(route)) continue; /* Do not remove routes we configured. */ if (route->source != NETWORK_CONFIG_SOURCE_FOREIGN) continue; /* Ignore routes not assigned yet or already removed. */ if (!route_exists(route)) continue; if (route->protocol == RTPROT_STATIC && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC)) continue; if (route->protocol == RTPROT_DHCP && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) continue; route_mark(route); } HASHMAP_FOREACH(route, link->network->routes_by_section) { _cleanup_(converted_routes_freep) ConvertedRoutes *converted = NULL; Route *existing; r = route_convert(link->manager, route, &converted); if (r < 0) continue; if (r == 0) { if (route_get(NULL, link, route, &existing) >= 0) route_unmark(existing); continue; } for (size_t i = 0; i < converted->n; i++) if (route_get(NULL, link, converted->routes[i], &existing) >= 0) route_unmark(existing); } link_unmark_wireguard_routes(link); r = 0; SET_FOREACH(route, link->routes) { if (!route_is_marked(route)) continue; k = route_remove(route); if (k < 0 && r >= 0) r = k; } manager_mark_routes(link->manager, /* foreign = */ true, NULL); k = manager_drop_marked_routes(link->manager); if (k < 0 && r >= 0) r = k; return r; } int link_drop_managed_routes(Link *link) { Route *route; int k, r = 0; assert(link); SET_FOREACH(route, link->routes) { /* do not touch routes managed by the kernel */ if (route_by_kernel(route)) continue; /* Do not touch routes managed by kernel or other tools. */ if (route->source == NETWORK_CONFIG_SOURCE_FOREIGN) continue; if (!route_exists(route)) continue; k = route_remove(route); if (k < 0 && r >= 0) r = k; } manager_mark_routes(link->manager, /* foreign = */ false, link); k = manager_drop_marked_routes(link->manager); if (k < 0 && r >= 0) r = k; return r; } void link_foreignize_routes(Link *link) { Route *route; assert(link); SET_FOREACH(route, link->routes) route->source = NETWORK_CONFIG_SOURCE_FOREIGN; manager_mark_routes(link->manager, /* foreign = */ false, link); SET_FOREACH(route, link->manager->routes) { if (!route_is_marked(route)) continue; route->source = NETWORK_CONFIG_SOURCE_FOREIGN; } } static int route_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) { Route *route = userdata; Link *link; int r; assert(route); assert(route->manager || (route->link && route->link->manager)); link = route->link; /* This may be NULL. */ r = route_remove(route); if (r < 0) { log_link_warning_errno(link, r, "Could not remove route: %m"); if (link) link_enter_failed(link); } return 1; } static int route_setup_timer(Route *route, const struct rta_cacheinfo *cacheinfo) { Manager *manager; int r; assert(route); assert(route->manager || (route->link && route->link->manager)); manager = route->manager ?: route->link->manager; if (route->lifetime_usec == USEC_INFINITY) return 0; if (cacheinfo && cacheinfo->rta_expires != 0) /* Assume that non-zero rta_expires means kernel will handle the route expiration. */ return 0; r = event_reset_time(manager->event, &route->expire, CLOCK_BOOTTIME, route->lifetime_usec, 0, route_expire_handler, route, 0, "route-expiration", true); if (r < 0) return r; return 1; } static int append_nexthop_one(const Link *link, const Route *route, const MultipathRoute *m, struct rtattr **rta, size_t offset) { struct rtnexthop *rtnh; struct rtattr *new_rta; int r; assert(route); assert(m); assert(rta); assert(*rta); new_rta = realloc(*rta, RTA_ALIGN((*rta)->rta_len) + RTA_SPACE(sizeof(struct rtnexthop))); if (!new_rta) return -ENOMEM; *rta = new_rta; rtnh = (struct rtnexthop *)((uint8_t *) *rta + offset); *rtnh = (struct rtnexthop) { .rtnh_len = sizeof(*rtnh), .rtnh_ifindex = m->ifindex > 0 ? m->ifindex : link->ifindex, .rtnh_hops = m->weight, }; (*rta)->rta_len += sizeof(struct rtnexthop); if (route->family == m->gateway.family) { r = rtattr_append_attribute(rta, RTA_GATEWAY, &m->gateway.address, FAMILY_ADDRESS_SIZE(m->gateway.family)); if (r < 0) goto clear; rtnh = (struct rtnexthop *)((uint8_t *) *rta + offset); rtnh->rtnh_len += RTA_SPACE(FAMILY_ADDRESS_SIZE(m->gateway.family)); } else { r = rtattr_append_attribute(rta, RTA_VIA, &m->gateway, FAMILY_ADDRESS_SIZE(m->gateway.family) + sizeof(m->gateway.family)); if (r < 0) goto clear; rtnh = (struct rtnexthop *)((uint8_t *) *rta + offset); rtnh->rtnh_len += RTA_SPACE(FAMILY_ADDRESS_SIZE(m->gateway.family) + sizeof(m->gateway.family)); } return 0; clear: (*rta)->rta_len -= sizeof(struct rtnexthop); return r; } static int append_nexthops(const Link *link, const Route *route, sd_netlink_message *req) { _cleanup_free_ struct rtattr *rta = NULL; struct rtnexthop *rtnh; MultipathRoute *m; size_t offset; int r; assert(link); assert(route); assert(req); if (ordered_set_isempty(route->multipath_routes)) return 0; rta = new(struct rtattr, 1); if (!rta) return -ENOMEM; *rta = (struct rtattr) { .rta_type = RTA_MULTIPATH, .rta_len = RTA_LENGTH(0), }; offset = (uint8_t *) RTA_DATA(rta) - (uint8_t *) rta; ORDERED_SET_FOREACH(m, route->multipath_routes) { r = append_nexthop_one(link, route, m, &rta, offset); if (r < 0) return r; rtnh = (struct rtnexthop *)((uint8_t *) rta + offset); offset = (uint8_t *) RTNH_NEXT(rtnh) - (uint8_t *) rta; } r = sd_netlink_message_append_data(req, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta)); if (r < 0) return r; return 0; } int route_configure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) { int r; assert(m); assert(link); assert(error_msg); r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_message_warning_errno(link, m, r, "Could not set route"); link_enter_failed(link); return 0; } return 1; } static int route_configure(const Route *route, Link *link, Request *req) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; int r; assert(route); assert(IN_SET(route->family, AF_INET, AF_INET6)); assert(link); assert(link->manager); assert(link->manager->rtnl); assert(link->ifindex > 0); assert(req); log_route_debug(route, "Configuring", link, link->manager); r = sd_rtnl_message_new_route(link->manager->rtnl, &m, RTM_NEWROUTE, route->family, route->protocol); if (r < 0) return r; r = sd_rtnl_message_route_set_type(m, route->type); if (r < 0) return r; r = route_set_netlink_message(route, m, link); if (r < 0) return r; if (route->lifetime_usec != USEC_INFINITY) { r = sd_netlink_message_append_u32(m, RTA_EXPIRES, MIN(DIV_ROUND_UP(usec_sub_unsigned(route->lifetime_usec, now(CLOCK_BOOTTIME)), USEC_PER_SEC), UINT32_MAX)); if (r < 0) return r; } if (route->ttl_propagate >= 0) { r = sd_netlink_message_append_u8(m, RTA_TTL_PROPAGATE, route->ttl_propagate); if (r < 0) return r; } r = sd_netlink_message_open_container(m, RTA_METRICS); if (r < 0) return r; if (route->mtu > 0) { r = sd_netlink_message_append_u32(m, RTAX_MTU, route->mtu); if (r < 0) return r; } if (route->initcwnd > 0) { r = sd_netlink_message_append_u32(m, RTAX_INITCWND, route->initcwnd); if (r < 0) return r; } if (route->initrwnd > 0) { r = sd_netlink_message_append_u32(m, RTAX_INITRWND, route->initrwnd); if (r < 0) return r; } if (route->quickack >= 0) { r = sd_netlink_message_append_u32(m, RTAX_QUICKACK, route->quickack); if (r < 0) return r; } if (route->fast_open_no_cookie >= 0) { r = sd_netlink_message_append_u32(m, RTAX_FASTOPEN_NO_COOKIE, route->fast_open_no_cookie); if (r < 0) return r; } if (route->advmss > 0) { r = sd_netlink_message_append_u32(m, RTAX_ADVMSS, route->advmss); if (r < 0) return r; } r = sd_netlink_message_close_container(m); if (r < 0) return r; if (!ordered_set_isempty(route->multipath_routes)) { assert(route->nexthop_id == 0); assert(!in_addr_is_set(route->gw_family, &route->gw)); r = append_nexthops(link, route, m); if (r < 0) return r; } return request_call_netlink_async(link->manager->rtnl, m, req); } static int route_is_ready_to_configure(const Route *route, Link *link) { int r; assert(route); assert(link); if (!link_is_ready_to_configure(link, false)) return false; if (set_size(link->routes) >= routes_max()) return false; if (route->nexthop_id > 0) { struct nexthop_grp *nhg; NextHop *nh; if (manager_get_nexthop_by_id(link->manager, route->nexthop_id, &nh) < 0) return false; if (!nexthop_exists(nh)) return false; HASHMAP_FOREACH(nhg, nh->group) { NextHop *g; if (manager_get_nexthop_by_id(link->manager, nhg->id, &g) < 0) return false; if (!nexthop_exists(g)) return false; } } if (in_addr_is_set(route->family, &route->prefsrc) > 0) { r = manager_has_address(link->manager, route->family, &route->prefsrc, route->family == AF_INET6); if (r <= 0) return r; } if (!gateway_is_ready(link, FLAGS_SET(route->flags, RTNH_F_ONLINK), route->gw_family, &route->gw)) return false; MultipathRoute *m; ORDERED_SET_FOREACH(m, route->multipath_routes) { union in_addr_union a = m->gateway.address; Link *l = NULL; r = multipath_route_get_link(link->manager, m, &l); if (r < 0) return false; if (r > 0) { if (!link_is_ready_to_configure(l, true)) return false; m->ifindex = l->ifindex; } if (!gateway_is_ready(l ?: link, FLAGS_SET(route->flags, RTNH_F_ONLINK), m->gateway.family, &a)) return false; } return true; } static int route_process_request(Request *req, Link *link, Route *route) { _cleanup_(converted_routes_freep) ConvertedRoutes *converted = NULL; int r; assert(req); assert(link); assert(route); r = route_is_ready_to_configure(route, link); if (r < 0) return log_link_warning_errno(link, r, "Failed to check if route is ready to configure: %m"); if (r == 0) return 0; if (route_needs_convert(route)) { r = route_convert(link->manager, route, &converted); if (r < 0) return log_link_warning_errno(link, r, "Failed to convert route: %m"); assert(r > 0); assert(converted); for (size_t i = 0; i < converted->n; i++) { Route *existing; if (route_get(link->manager, converted->links[i] ?: link, converted->routes[i], &existing) < 0) { _cleanup_(route_freep) Route *tmp = NULL; r = route_dup(converted->routes[i], &tmp); if (r < 0) return log_oom(); r = route_add(link->manager, converted->links[i] ?: link, tmp); if (r < 0) return log_link_warning_errno(link, r, "Failed to add route: %m"); TAKE_PTR(tmp); } else { existing->source = converted->routes[i]->source; existing->provider = converted->routes[i]->provider; } } } r = route_configure(route, link, req); if (r < 0) return log_link_warning_errno(link, r, "Failed to configure route: %m"); if (converted) for (size_t i = 0; i < converted->n; i++) { Route *existing; assert_se(route_get(link->manager, converted->links[i] ?: link, converted->routes[i], &existing) >= 0); route_enter_configuring(existing); } else route_enter_configuring(route); return 1; } int link_request_route( Link *link, Route *route, bool consume_object, unsigned *message_counter, route_netlink_handler_t netlink_handler, Request **ret) { Route *existing; int r; assert(link); assert(link->manager); assert(route); assert(route->source != NETWORK_CONFIG_SOURCE_FOREIGN); assert(!route_needs_convert(route)); if (route_get(link->manager, link, route, &existing) < 0) { _cleanup_(route_freep) Route *tmp = NULL; if (consume_object) tmp = route; else { r = route_dup(route, &tmp); if (r < 0) return r; } r = route_add(link->manager, link, tmp); if (r < 0) return r; existing = TAKE_PTR(tmp); } else { existing->source = route->source; existing->provider = route->provider; existing->lifetime_usec = route->lifetime_usec; if (consume_object) route_free(route); if (existing->expire) { /* When re-configuring an existing route, kernel does not send RTM_NEWROUTE * message, so we need to update the timer here. */ r = route_setup_timer(existing, NULL); if (r < 0) log_link_warning_errno(link, r, "Failed to update expiration timer for route, ignoring: %m"); if (r > 0) log_route_debug(existing, "Updated expiration timer for", link, link->manager); } } log_route_debug(existing, "Requesting", link, link->manager); r = link_queue_request_safe(link, REQUEST_TYPE_ROUTE, existing, NULL, route_hash_func, route_compare_func, route_process_request, message_counter, netlink_handler, ret); if (r <= 0) return r; route_enter_requesting(existing); return 1; } static int static_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { int r; assert(link); r = route_configure_handler_internal(rtnl, m, link, "Could not set route"); if (r <= 0) return r; if (link->static_route_messages == 0) { log_link_debug(link, "Routes set"); link->static_routes_configured = true; link_check_ready(link); } return 1; } static int link_request_static_route(Link *link, Route *route) { assert(link); assert(link->manager); assert(route); if (!route_needs_convert(route)) return link_request_route(link, route, false, &link->static_route_messages, static_route_handler, NULL); log_route_debug(route, "Requesting", link, link->manager); return link_queue_request_safe(link, REQUEST_TYPE_ROUTE, route, NULL, route_hash_func, route_compare_func, route_process_request, &link->static_route_messages, static_route_handler, NULL); } static int link_request_wireguard_routes(Link *link, bool only_ipv4) { NetDev *netdev; Wireguard *w; Route *route; int r; assert(link); if (!streq_ptr(link->kind, "wireguard")) return 0; if (netdev_get(link->manager, link->ifname, &netdev) < 0) return 0; w = WIREGUARD(netdev); if (!w) return 0; SET_FOREACH(route, w->routes) { if (only_ipv4 && route->family != AF_INET) continue; r = link_request_static_route(link, route); if (r < 0) return r; } return 0; } int link_request_static_routes(Link *link, bool only_ipv4) { Route *route; int r; assert(link); assert(link->network); link->static_routes_configured = false; HASHMAP_FOREACH(route, link->network->routes_by_section) { if (route->gateway_from_dhcp_or_ra) continue; if (only_ipv4 && route->family != AF_INET) continue; r = link_request_static_route(link, route); if (r < 0) return r; } r = link_request_wireguard_routes(link, only_ipv4); if (r < 0) return r; if (link->static_route_messages == 0) { link->static_routes_configured = true; link_check_ready(link); } else { log_link_debug(link, "Requesting routes"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } void route_cancel_request(Route *route, Link *link) { Request req; assert(route); link = route->link ?: link; assert(link); if (!route_is_requesting(route)) return; req = (Request) { .link = link, .type = REQUEST_TYPE_ROUTE, .userdata = route, .hash_func = (hash_func_t) route_hash_func, .compare_func = (compare_func_t) route_compare_func, }; request_detach(link->manager, &req); route_cancel_requesting(route); } static int process_route_one( Manager *manager, Link *link, uint16_t type, Route *in, const struct rta_cacheinfo *cacheinfo) { _cleanup_(route_freep) Route *tmp = in; Route *route = NULL; int r; assert(manager); assert(tmp); assert(IN_SET(type, RTM_NEWROUTE, RTM_DELROUTE)); /* link may be NULL. This consumes 'in'. */ (void) route_get(manager, link, tmp, &route); switch (type) { case RTM_NEWROUTE: if (route) { route->flags = tmp->flags; route_enter_configured(route); log_route_debug(route, "Received remembered", link, manager); r = route_setup_timer(route, cacheinfo); if (r < 0) log_link_warning_errno(link, r, "Failed to configure expiration timer for route, ignoring: %m"); if (r > 0) log_route_debug(route, "Configured expiration timer for", link, manager); } else if (!manager->manage_foreign_routes) { route_enter_configured(tmp); log_route_debug(tmp, "Ignoring received", link, manager); } else { /* A route appeared that we did not request */ route_enter_configured(tmp); log_route_debug(tmp, "Received new", link, manager); r = route_add(manager, link, tmp); if (r < 0) { log_link_warning_errno(link, r, "Failed to remember foreign route, ignoring: %m"); return 0; } TAKE_PTR(tmp); } break; case RTM_DELROUTE: if (route) { route_enter_removed(route); if (route->state == 0) { log_route_debug(route, "Forgetting", link, manager); route_free(route); } else log_route_debug(route, "Removed", link, manager); } else log_route_debug(tmp, manager->manage_foreign_routes ? "Kernel removed unknown" : "Ignoring received", link, manager); break; default: assert_not_reached(); } return 1; } int manager_rtnl_process_route(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) { _cleanup_(converted_routes_freep) ConvertedRoutes *converted = NULL; _cleanup_(route_freep) Route *tmp = NULL; _cleanup_free_ void *rta_multipath = NULL; struct rta_cacheinfo cacheinfo; bool has_cacheinfo; Link *link = NULL; uint32_t ifindex; uint16_t type; size_t rta_len; int r; assert(rtnl); assert(message); assert(m); if (sd_netlink_message_is_error(message)) { r = sd_netlink_message_get_errno(message); if (r < 0) log_message_warning_errno(message, r, "rtnl: failed to receive route message, ignoring"); return 0; } r = sd_netlink_message_get_type(message, &type); if (r < 0) { log_warning_errno(r, "rtnl: could not get message type, ignoring: %m"); return 0; } else if (!IN_SET(type, RTM_NEWROUTE, RTM_DELROUTE)) { log_warning("rtnl: received unexpected message type %u when processing route, ignoring.", type); return 0; } r = sd_netlink_message_read_u32(message, RTA_OIF, &ifindex); if (r < 0 && r != -ENODATA) { log_warning_errno(r, "rtnl: could not get ifindex from route message, ignoring: %m"); return 0; } else if (r >= 0) { if (ifindex <= 0) { log_warning("rtnl: received route message with invalid ifindex %d, ignoring.", ifindex); return 0; } r = link_get_by_index(m, ifindex, &link); if (r < 0 || !link) { /* when enumerating we might be out of sync, but we will * get the route again, so just ignore it */ if (!m->enumerating) log_warning("rtnl: received route message for link (%d) we do not know about, ignoring", ifindex); return 0; } } r = route_new(&tmp); if (r < 0) return log_oom(); r = sd_rtnl_message_route_get_family(message, &tmp->family); if (r < 0) { log_link_warning(link, "rtnl: received route message without family, ignoring"); return 0; } else if (!IN_SET(tmp->family, AF_INET, AF_INET6)) { log_link_debug(link, "rtnl: received route message with invalid family '%i', ignoring", tmp->family); return 0; } r = sd_rtnl_message_route_get_protocol(message, &tmp->protocol); if (r < 0) { log_warning_errno(r, "rtnl: received route message without route protocol, ignoring: %m"); return 0; } r = sd_rtnl_message_route_get_flags(message, &tmp->flags); if (r < 0) { log_warning_errno(r, "rtnl: received route message without route flags, ignoring: %m"); return 0; } r = netlink_message_read_in_addr_union(message, RTA_DST, tmp->family, &tmp->dst); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message without valid destination, ignoring: %m"); return 0; } r = netlink_message_read_in_addr_union(message, RTA_GATEWAY, tmp->family, &tmp->gw); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message without valid gateway, ignoring: %m"); return 0; } else if (r >= 0) tmp->gw_family = tmp->family; else if (tmp->family == AF_INET) { RouteVia via; r = sd_netlink_message_read(message, RTA_VIA, sizeof(via), &via); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message without valid gateway, ignoring: %m"); return 0; } else if (r >= 0) { tmp->gw_family = via.family; tmp->gw = via.address; } } r = netlink_message_read_in_addr_union(message, RTA_SRC, tmp->family, &tmp->src); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message without valid source, ignoring: %m"); return 0; } r = netlink_message_read_in_addr_union(message, RTA_PREFSRC, tmp->family, &tmp->prefsrc); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message without valid preferred source, ignoring: %m"); return 0; } r = sd_rtnl_message_route_get_dst_prefixlen(message, &tmp->dst_prefixlen); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received route message with invalid destination prefixlen, ignoring: %m"); return 0; } r = sd_rtnl_message_route_get_src_prefixlen(message, &tmp->src_prefixlen); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received route message with invalid source prefixlen, ignoring: %m"); return 0; } r = sd_rtnl_message_route_get_scope(message, &tmp->scope); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received route message with invalid scope, ignoring: %m"); return 0; } r = sd_rtnl_message_route_get_tos(message, &tmp->tos); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received route message with invalid tos, ignoring: %m"); return 0; } r = sd_rtnl_message_route_get_type(message, &tmp->type); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received route message with invalid type, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, RTA_TABLE, &tmp->table); if (r == -ENODATA) { unsigned char table; r = sd_rtnl_message_route_get_table(message, &table); if (r >= 0) tmp->table = table; } if (r < 0) { log_link_warning_errno(link, r, "rtnl: received route message with invalid table, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, RTA_PRIORITY, &tmp->priority); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message with invalid priority, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, RTA_NH_ID, &tmp->nexthop_id); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message with invalid nexthop id, ignoring: %m"); return 0; } r = sd_netlink_message_enter_container(message, RTA_METRICS); if (r < 0 && r != -ENODATA) { log_link_error_errno(link, r, "rtnl: Could not enter RTA_METRICS container, ignoring: %m"); return 0; } if (r >= 0) { r = sd_netlink_message_read_u32(message, RTAX_INITCWND, &tmp->initcwnd); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message with invalid initcwnd, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, RTAX_INITRWND, &tmp->initrwnd); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message with invalid initrwnd, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, RTAX_ADVMSS, &tmp->advmss); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: received route message with invalid advmss, ignoring: %m"); return 0; } r = sd_netlink_message_exit_container(message); if (r < 0) { log_link_error_errno(link, r, "rtnl: Could not exit from RTA_METRICS container, ignoring: %m"); return 0; } } r = sd_netlink_message_read_data(message, RTA_MULTIPATH, &rta_len, &rta_multipath); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: failed to read RTA_MULTIPATH attribute, ignoring: %m"); return 0; } else if (r >= 0) { r = rtattr_read_nexthop(rta_multipath, rta_len, tmp->family, &tmp->multipath_routes); if (r < 0) { log_link_warning_errno(link, r, "rtnl: failed to parse RTA_MULTIPATH attribute, ignoring: %m"); return 0; } } r = sd_netlink_message_read(message, RTA_CACHEINFO, sizeof(cacheinfo), &cacheinfo); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: failed to read RTA_CACHEINFO attribute, ignoring: %m"); return 0; } has_cacheinfo = r >= 0; /* IPv6 routes with reject type are always assigned to the loopback interface. See kernel's * fib6_nh_init() in net/ipv6/route.c. However, we'd like to manage them by Manager. Hence, set * link to NULL here. */ if (route_type_is_reject(tmp)) link = NULL; if (!route_needs_convert(tmp)) return process_route_one(m, link, type, TAKE_PTR(tmp), has_cacheinfo ? &cacheinfo : NULL); r = route_convert(m, tmp, &converted); if (r < 0) { log_link_warning_errno(link, r, "rtnl: failed to convert received route, ignoring: %m"); return 0; } assert(r > 0); assert(converted); for (size_t i = 0; i < converted->n; i++) (void) process_route_one(m, converted->links[i] ?: link, type, TAKE_PTR(converted->routes[i]), has_cacheinfo ? &cacheinfo : NULL); return 1; } int network_add_ipv4ll_route(Network *network) { _cleanup_(route_free_or_set_invalidp) Route *n = NULL; unsigned section_line; int r; assert(network); if (!network->ipv4ll_route) return 0; section_line = hashmap_find_free_section_line(network->routes_by_section); /* IPv4LLRoute= is in [Network] section. */ r = route_new_static(network, network->filename, section_line, &n); if (r < 0) return r; r = in_addr_from_string(AF_INET, "169.254.0.0", &n->dst); if (r < 0) return r; n->family = AF_INET; n->dst_prefixlen = 16; n->scope = RT_SCOPE_LINK; n->scope_set = true; n->table_set = true; n->priority = IPV4LL_ROUTE_METRIC; n->protocol = RTPROT_STATIC; TAKE_PTR(n); return 0; } int network_add_default_route_on_device(Network *network) { _cleanup_(route_free_or_set_invalidp) Route *n = NULL; unsigned section_line; int r; assert(network); if (!network->default_route_on_device) return 0; section_line = hashmap_find_free_section_line(network->routes_by_section); /* DefaultRouteOnDevice= is in [Network] section. */ r = route_new_static(network, network->filename, section_line, &n); if (r < 0) return r; n->family = AF_INET; n->scope = RT_SCOPE_LINK; n->scope_set = true; n->protocol = RTPROT_STATIC; TAKE_PTR(n); return 0; } int config_parse_gateway( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); if (streq(section, "Network")) { /* we are not in an Route section, so use line number instead */ r = route_new_static(network, filename, line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } } else { r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } if (isempty(rvalue)) { n->gateway_from_dhcp_or_ra = false; n->gw_family = AF_UNSPEC; n->gw = IN_ADDR_NULL; TAKE_PTR(n); return 0; } if (streq(rvalue, "_dhcp")) { n->gateway_from_dhcp_or_ra = true; TAKE_PTR(n); return 0; } if (streq(rvalue, "_dhcp4")) { n->gw_family = AF_INET; n->gateway_from_dhcp_or_ra = true; TAKE_PTR(n); return 0; } if (streq(rvalue, "_ipv6ra")) { n->gw_family = AF_INET6; n->gateway_from_dhcp_or_ra = true; TAKE_PTR(n); return 0; } } r = in_addr_from_string_auto(rvalue, &n->gw_family, &n->gw); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue); return 0; } n->gateway_from_dhcp_or_ra = false; TAKE_PTR(n); return 0; } int config_parse_preferred_src( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } if (n->family == AF_UNSPEC) r = in_addr_from_string_auto(rvalue, &n->family, &n->prefsrc); else r = in_addr_from_string(n->family, rvalue, &n->prefsrc); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, EINVAL, "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue); return 0; } TAKE_PTR(n); return 0; } int config_parse_destination( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; union in_addr_union *buffer; unsigned char *prefixlen; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } if (streq(lvalue, "Destination")) { buffer = &n->dst; prefixlen = &n->dst_prefixlen; } else if (streq(lvalue, "Source")) { buffer = &n->src; prefixlen = &n->src_prefixlen; } else assert_not_reached(); if (n->family == AF_UNSPEC) r = in_addr_prefix_from_string_auto(rvalue, &n->family, buffer, prefixlen); else r = in_addr_prefix_from_string(rvalue, n->family, buffer, prefixlen); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, EINVAL, "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue); return 0; } (void) in_addr_mask(n->family, buffer, *prefixlen); TAKE_PTR(n); return 0; } int config_parse_route_priority( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } r = safe_atou32(rvalue, &n->priority); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse route priority \"%s\", ignoring assignment: %m", rvalue); return 0; } n->priority_set = true; TAKE_PTR(n); return 0; } int config_parse_route_scope( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } r = route_scope_from_string(rvalue); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Unknown route scope: %s", rvalue); return 0; } n->scope = r; n->scope_set = true; TAKE_PTR(n); return 0; } int config_parse_route_nexthop( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; uint32_t id; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } if (isempty(rvalue)) { n->nexthop_id = 0; TAKE_PTR(n); return 0; } r = safe_atou32(rvalue, &id); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse nexthop ID, ignoring assignment: %s", rvalue); return 0; } if (id == 0) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid nexthop ID, ignoring assignment: %s", rvalue); return 0; } n->nexthop_id = id; TAKE_PTR(n); return 0; } int config_parse_route_table( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(route_free_or_set_invalidp) Route *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } r = manager_get_route_table_from_string(network->manager, rvalue, &n->table); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse route table number \"%s\", ignoring assignment: %m", rvalue); return 0; } n->table_set = true; TAKE_PTR(n); return 0; } int config_parse_route_boolean( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } r = parse_boolean(rvalue); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse %s=\"%s\", ignoring assignment: %m", lvalue, rvalue); return 0; } if (STR_IN_SET(lvalue, "GatewayOnLink", "GatewayOnlink")) n->gateway_onlink = r; else if (streq(lvalue, "QuickAck")) n->quickack = r; else if (streq(lvalue, "FastOpenNoCookie")) n->fast_open_no_cookie = r; else if (streq(lvalue, "TTLPropagate")) n->ttl_propagate = r; else assert_not_reached(); TAKE_PTR(n); return 0; } int config_parse_ipv6_route_preference( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int r; r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } if (streq(rvalue, "low")) n->pref = ICMPV6_ROUTER_PREF_LOW; else if (streq(rvalue, "medium")) n->pref = ICMPV6_ROUTER_PREF_MEDIUM; else if (streq(rvalue, "high")) n->pref = ICMPV6_ROUTER_PREF_HIGH; else { log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown route preference: %s", rvalue); return 0; } n->pref_set = true; TAKE_PTR(n); return 0; } int config_parse_route_protocol( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int r; r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } r = route_protocol_from_string(rvalue); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse route protocol \"%s\", ignoring assignment: %m", rvalue); return 0; } n->protocol = r; TAKE_PTR(n); return 0; } int config_parse_route_type( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int t, r; r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } t = route_type_from_string(rvalue); if (t < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse route type \"%s\", ignoring assignment: %m", rvalue); return 0; } n->type = (unsigned char) t; TAKE_PTR(n); return 0; } int config_parse_tcp_advmss( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(route_free_or_set_invalidp) Route *n = NULL; Network *network = userdata; uint64_t u; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } if (isempty(rvalue)) { n->advmss = 0; TAKE_PTR(n); return 0; } r = parse_size(rvalue, 1024, &u); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse TCPAdvertisedMaximumSegmentSize= \"%s\", ignoring assignment: %m", rvalue); return 0; } if (u == 0 || u > UINT32_MAX) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid TCPAdvertisedMaximumSegmentSize= \"%s\", ignoring assignment: %m", rvalue); return 0; } n->advmss = u; TAKE_PTR(n); return 0; } int config_parse_tcp_window( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(route_free_or_set_invalidp) Route *n = NULL; Network *network = userdata; uint32_t k; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } r = safe_atou32(rvalue, &k); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse TCP %s \"%s\", ignoring assignment: %m", lvalue, rvalue); return 0; } if (k >= 1024) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Specified TCP %s \"%s\" is too large, ignoring assignment: %m", lvalue, rvalue); return 0; } if (k == 0) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid TCP %s \"%s\", ignoring assignment: %m", lvalue, rvalue); return 0; } if (streq(lvalue, "InitialCongestionWindow")) n->initcwnd = k; else if (streq(lvalue, "InitialAdvertisedReceiveWindow")) n->initrwnd = k; else assert_not_reached(); TAKE_PTR(n); return 0; } int config_parse_route_mtu( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { Network *network = userdata; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } r = config_parse_mtu(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &n->mtu, userdata); if (r < 0) return r; TAKE_PTR(n); return 0; } int config_parse_multipath_route( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_(multipath_route_freep) MultipathRoute *m = NULL; _cleanup_(route_free_or_set_invalidp) Route *n = NULL; _cleanup_free_ char *word = NULL; Network *network = userdata; union in_addr_union a; int family, r; const char *p; char *dev; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = route_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate route, ignoring assignment: %m"); return 0; } if (isempty(rvalue)) { n->multipath_routes = ordered_set_free_with_destructor(n->multipath_routes, multipath_route_free); return 0; } m = new0(MultipathRoute, 1); if (!m) return log_oom(); p = rvalue; r = extract_first_word(&p, &word, NULL, 0); if (r == -ENOMEM) return log_oom(); if (r <= 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid multipath route option, ignoring assignment: %s", rvalue); return 0; } dev = strchr(word, '@'); if (dev) { *dev++ = '\0'; r = parse_ifindex(dev); if (r > 0) m->ifindex = r; else { if (!ifname_valid_full(dev, IFNAME_VALID_ALTERNATIVE)) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid interface name '%s' in %s=, ignoring: %s", dev, lvalue, rvalue); return 0; } m->ifname = strdup(dev); if (!m->ifname) return log_oom(); } } r = in_addr_from_string_auto(word, &family, &a); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid multipath route gateway '%s', ignoring assignment: %m", rvalue); return 0; } m->gateway.address = a; m->gateway.family = family; if (!isempty(p)) { r = safe_atou32(p, &m->weight); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid multipath route weight, ignoring assignment: %s", p); return 0; } /* ip command takes weight in the range 1…255, while kernel takes the value in the * range 0…254. MultiPathRoute= setting also takes weight in the same range which ip * command uses, then networkd decreases by one and stores it to match the range which * kernel uses. */ if (m->weight == 0 || m->weight > 256) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid multipath route weight, ignoring assignment: %s", p); return 0; } m->weight--; } r = ordered_set_ensure_put(&n->multipath_routes, NULL, m); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to store multipath route, ignoring assignment: %m"); return 0; } TAKE_PTR(m); TAKE_PTR(n); return 0; } static int route_section_verify(Route *route, Network *network) { if (section_is_invalid(route->section)) return -EINVAL; /* Currently, we do not support static route with finite lifetime. */ assert(route->lifetime_usec == USEC_INFINITY); if (route->gateway_from_dhcp_or_ra) { if (route->gw_family == AF_UNSPEC) { /* When deprecated Gateway=_dhcp is set, then assume gateway family based on other settings. */ switch (route->family) { case AF_UNSPEC: log_warning("%s: Deprecated value \"_dhcp\" is specified for Gateway= in [Route] section from line %u. " "Please use \"_dhcp4\" or \"_ipv6ra\" instead. Assuming \"_dhcp4\".", route->section->filename, route->section->line); route->family = AF_INET; break; case AF_INET: case AF_INET6: log_warning("%s: Deprecated value \"_dhcp\" is specified for Gateway= in [Route] section from line %u. " "Assuming \"%s\" based on Destination=, Source=, or PreferredSource= setting.", route->section->filename, route->section->line, route->family == AF_INET ? "_dhcp4" : "_ipv6ra"); break; default: return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: Invalid route family. Ignoring [Route] section from line %u.", route->section->filename, route->section->line); } route->gw_family = route->family; } if (route->gw_family == AF_INET && !FLAGS_SET(network->dhcp, ADDRESS_FAMILY_IPV4)) return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: Gateway=\"_dhcp4\" is specified but DHCPv4 client is disabled. " "Ignoring [Route] section from line %u.", route->section->filename, route->section->line); if (route->gw_family == AF_INET6 && !network->ipv6_accept_ra) return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: Gateway=\"_ipv6ra\" is specified but IPv6AcceptRA= is disabled. " "Ignoring [Route] section from line %u.", route->section->filename, route->section->line); } /* When only Gateway= is specified, assume the route family based on the Gateway address. */ if (route->family == AF_UNSPEC) route->family = route->gw_family; if (route->family == AF_UNSPEC) { assert(route->section); return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: Route section without Gateway=, Destination=, Source=, " "or PreferredSource= field configured. " "Ignoring [Route] section from line %u.", route->section->filename, route->section->line); } if (route->family == AF_INET6 && route->gw_family == AF_INET) return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: IPv4 gateway is configured for IPv6 route. " "Ignoring [Route] section from line %u.", route->section->filename, route->section->line); if (!route->table_set && network->vrf) { route->table = VRF(network->vrf)->table; route->table_set = true; } if (!route->table_set && IN_SET(route->type, RTN_LOCAL, RTN_BROADCAST, RTN_ANYCAST, RTN_NAT)) route->table = RT_TABLE_LOCAL; if (!route->scope_set && route->family != AF_INET6) { if (IN_SET(route->type, RTN_LOCAL, RTN_NAT)) route->scope = RT_SCOPE_HOST; else if (IN_SET(route->type, RTN_BROADCAST, RTN_ANYCAST, RTN_MULTICAST)) route->scope = RT_SCOPE_LINK; else if (IN_SET(route->type, RTN_UNICAST, RTN_UNSPEC) && !route->gateway_from_dhcp_or_ra && !in_addr_is_set(route->gw_family, &route->gw) && ordered_set_isempty(route->multipath_routes) && route->nexthop_id == 0) route->scope = RT_SCOPE_LINK; } if (route->scope != RT_SCOPE_UNIVERSE && route->family == AF_INET6) { log_warning("%s: Scope= is specified for IPv6 route. It will be ignored.", route->section->filename); route->scope = RT_SCOPE_UNIVERSE; } if (route->family == AF_INET6 && route->priority == 0) route->priority = IP6_RT_PRIO_USER; if (route->gateway_onlink < 0 && in_addr_is_set(route->gw_family, &route->gw) && ordered_hashmap_isempty(network->addresses_by_section)) { /* If no address is configured, in most cases the gateway cannot be reachable. * TODO: we may need to improve the condition above. */ log_warning("%s: Gateway= without static address configured. " "Enabling GatewayOnLink= option.", network->filename); route->gateway_onlink = true; } if (route->gateway_onlink >= 0) SET_FLAG(route->flags, RTNH_F_ONLINK, route->gateway_onlink); if (route->family == AF_INET6) { MultipathRoute *m; ORDERED_SET_FOREACH(m, route->multipath_routes) if (m->gateway.family == AF_INET) return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: IPv4 multipath route is specified for IPv6 route. " "Ignoring [Route] section from line %u.", route->section->filename, route->section->line); } if ((route->gateway_from_dhcp_or_ra || in_addr_is_set(route->gw_family, &route->gw)) && !ordered_set_isempty(route->multipath_routes)) return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: Gateway= cannot be specified with MultiPathRoute=. " "Ignoring [Route] section from line %u.", route->section->filename, route->section->line); if (route->nexthop_id > 0 && (route->gateway_from_dhcp_or_ra || in_addr_is_set(route->gw_family, &route->gw) || !ordered_set_isempty(route->multipath_routes))) return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: NextHopId= cannot be specified with Gateway= or MultiPathRoute=. " "Ignoring [Route] section from line %u.", route->section->filename, route->section->line); return 0; } void network_drop_invalid_routes(Network *network) { Route *route; assert(network); HASHMAP_FOREACH(route, network->routes_by_section) if (route_section_verify(route, network) < 0) route_free(route); }