/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include "alloc-util.h" #include "netlink-util.h" #include "networkd-ipv4ll.h" #include "networkd-manager.h" #include "networkd-network.h" #include "networkd-nexthop.h" #include "networkd-route.h" #include "networkd-routing-policy-rule.h" #include "parse-util.h" #include "socket-netlink.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "strxcpyx.h" #include "sysctl-util.h" #include "vrf.h" #define ROUTES_DEFAULT_MAX_PER_FAMILY 4096U static uint32_t link_get_vrf_table(const Link *link) { return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN; } uint32_t link_get_dhcp_route_table(const Link *link) { /* When the interface is part of an VRF use the VRFs routing table, unless * another table is explicitly specified. */ if (link->network->dhcp_route_table_set) return link->network->dhcp_route_table; return link_get_vrf_table(link); } uint32_t link_get_ipv6_accept_ra_route_table(const Link *link) { if (link->network->ipv6_accept_ra_route_table_set) return link->network->ipv6_accept_ra_route_table; return link_get_vrf_table(link); } static const char * const route_type_table[__RTN_MAX] = { [RTN_UNICAST] = "unicast", [RTN_LOCAL] = "local", [RTN_BROADCAST] = "broadcast", [RTN_ANYCAST] = "anycast", [RTN_MULTICAST] = "multicast", [RTN_BLACKHOLE] = "blackhole", [RTN_UNREACHABLE] = "unreachable", [RTN_PROHIBIT] = "prohibit", [RTN_THROW] = "throw", [RTN_NAT] = "nat", [RTN_XRESOLVE] = "xresolve", }; assert_cc(__RTN_MAX <= UCHAR_MAX); DEFINE_PRIVATE_STRING_TABLE_LOOKUP(route_type, int); static const char * const route_scope_table[] = { [RT_SCOPE_UNIVERSE] = "global", [RT_SCOPE_SITE] = "site", [RT_SCOPE_LINK] = "link", [RT_SCOPE_HOST] = "host", [RT_SCOPE_NOWHERE] = "nowhere", }; DEFINE_PRIVATE_STRING_TABLE_LOOKUP(route_scope, int); #define ROUTE_SCOPE_STR_MAX CONST_MAX(DECIMAL_STR_MAX(int), STRLEN("nowhere") + 1) static const char *format_route_scope(int scope, char *buf, size_t size) { const char *s; char *p = buf; s = route_scope_to_string(scope); if (s) strpcpy(&p, size, s); else strpcpyf(&p, size, "%d", scope); return buf; } static const char * const route_table_table[] = { [RT_TABLE_DEFAULT] = "default", [RT_TABLE_MAIN] = "main", [RT_TABLE_LOCAL] = "local", }; DEFINE_PRIVATE_STRING_TABLE_LOOKUP(route_table, int); #define ROUTE_TABLE_STR_MAX CONST_MAX(DECIMAL_STR_MAX(int), STRLEN("default") + 1) static const char *format_route_table(int table, char *buf, size_t size) { const char *s; char *p = buf; s = route_table_to_string(table); if (s) strpcpy(&p, size, s); else strpcpyf(&p, size, "%d", table); return buf; } static const char * const route_protocol_table[] = { [RTPROT_KERNEL] = "kernel", [RTPROT_BOOT] = "boot", [RTPROT_STATIC] = "static", }; DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(route_protocol, int); static const char * const route_protocol_full_table[] = { [RTPROT_REDIRECT] = "redirect", [RTPROT_KERNEL] = "kernel", [RTPROT_BOOT] = "boot", [RTPROT_STATIC] = "static", [RTPROT_GATED] = "gated", [RTPROT_RA] = "ra", [RTPROT_MRT] = "mrt", [RTPROT_ZEBRA] = "zebra", [RTPROT_BIRD] = "bird", [RTPROT_DNROUTED] = "dnrouted", [RTPROT_XORP] = "xorp", [RTPROT_NTK] = "ntk", [RTPROT_DHCP] = "dhcp", [RTPROT_MROUTED] = "mrouted", [RTPROT_BABEL] = "babel", [RTPROT_BGP] = "bgp", [RTPROT_ISIS] = "isis", [RTPROT_OSPF] = "ospf", [RTPROT_RIP] = "rip", [RTPROT_EIGRP] = "eigrp", }; DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(route_protocol_full, int); #define ROUTE_PROTOCOL_STR_MAX CONST_MAX(DECIMAL_STR_MAX(int), STRLEN("redirect") + 1) static const char *format_route_protocol(int protocol, char *buf, size_t size) { const char *s; char *p = buf; s = route_protocol_full_to_string(protocol); if (s) strpcpy(&p, size, s); else strpcpyf(&p, size, "%d", protocol); return buf; } static unsigned routes_max(void) { static thread_local unsigned cached = 0; _cleanup_free_ char *s4 = NULL, *s6 = NULL; unsigned val4 = ROUTES_DEFAULT_MAX_PER_FAMILY, val6 = ROUTES_DEFAULT_MAX_PER_FAMILY; if (cached > 0) return cached; if (sysctl_read_ip_property(AF_INET, NULL, "route/max_size", &s4) >= 0) if (safe_atou(s4, &val4) >= 0 && val4 == 2147483647U) /* This is the default "no limit" value in the kernel */ val4 = ROUTES_DEFAULT_MAX_PER_FAMILY; if (sysctl_read_ip_property(AF_INET6, NULL, "route/max_size", &s6) >= 0) (void) safe_atou(s6, &val6); cached = MAX(ROUTES_DEFAULT_MAX_PER_FAMILY, val4) + MAX(ROUTES_DEFAULT_MAX_PER_FAMILY, val6); return cached; } 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_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_(network_config_section_freep) NetworkConfigSection *n = NULL; _cleanup_(route_freep) Route *route = NULL; int r; assert(network); assert(ret); assert(filename); assert(section_line > 0); r = network_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); r = hashmap_ensure_allocated(&network->routes_by_section, &network_config_hash_ops); if (r < 0) return r; r = hashmap_put(network->routes_by_section, 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); } network_config_section_free(route->section); if (route->link) { NDiscRoute *n; set_remove(route->link->routes, route); set_remove(route->link->routes_foreign, route); set_remove(route->link->dhcp_routes, route); set_remove(route->link->dhcp_routes_old, route); set_remove(route->link->dhcp6_routes, route); set_remove(route->link->dhcp6_routes_old, route); set_remove(route->link->dhcp6_pd_routes, route); set_remove(route->link->dhcp6_pd_routes_old, route); SET_FOREACH(n, route->link->ndisc_routes) if (n->route == route) free(set_remove(route->link->ndisc_routes, n)); } if (route->manager) { set_remove(route->manager->routes, route); set_remove(route->manager->routes_foreign, route); } ordered_set_free_free(route->multipath_routes); sd_event_source_unref(route->expire); return mfree(route); } 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); break; default: /* treat any other address family as AF_UNSPEC */ break; } } 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; 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_equal(const Route *r1, const Route *r2) { if (r1 == r2) return true; if (!r1 || !r2) return false; return route_compare_func(r1, r2) == 0; } static int route_get(const Manager *manager, const Link *link, const Route *in, Route **ret) { Route *existing; assert(manager || link); assert(in); if (link) { existing = set_get(link->routes, in); if (existing) { if (ret) *ret = existing; return 1; } existing = set_get(link->routes_foreign, in); if (existing) { if (ret) *ret = existing; return 0; } } else { existing = set_get(manager->routes, in); if (existing) { if (ret) *ret = existing; return 1; } existing = set_get(manager->routes_foreign, in); if (existing) { if (ret) *ret = existing; return 0; } } return -ENOENT; } static void route_copy(Route *dest, const Route *src, const MultipathRoute *m) { assert(dest); assert(src); dest->family = src->family; dest->src = src->src; dest->src_prefixlen = src->src_prefixlen; dest->dst = src->dst; dest->dst_prefixlen = src->dst_prefixlen; dest->prefsrc = src->prefsrc; dest->scope = src->scope; dest->protocol = src->protocol; dest->type = src->type; dest->tos = src->tos; dest->priority = src->priority; dest->table = src->table; dest->initcwnd = src->initcwnd; dest->initrwnd = src->initrwnd; dest->lifetime = src->lifetime; dest->advmss= src->advmss; if (m) { dest->gw_family = m->gateway.family; dest->gw = m->gateway.address; dest->gw_weight = m->weight; } else { dest->gw_family = src->gw_family; dest->gw = src->gw; dest->gw_weight = src->gw_weight; } } static int route_add_internal(Manager *manager, Link *link, Set **routes, const Route *in, Route **ret) { _cleanup_(route_freep) Route *route = NULL; int r; assert(manager || link); assert(routes); assert(in); r = route_new(&route); if (r < 0) return r; route_copy(route, in, NULL); r = set_ensure_put(routes, &route_hash_ops, route); if (r < 0) return r; if (r == 0) return -EEXIST; route->link = link; route->manager = manager; if (ret) *ret = route; route = NULL; return 0; } static int route_add_foreign(Manager *manager, Link *link, const Route *in, Route **ret) { assert(manager || link); return route_add_internal(manager, link, link ? &link->routes_foreign : &manager->routes_foreign, in, ret); } static int route_add(Manager *manager, Link *link, const Route *in, const MultipathRoute *m, Route **ret) { _cleanup_(route_freep) Route *tmp = NULL; Route *route; int r; assert(manager || link); assert(in); if (m) { assert(link && (m->ifindex == 0 || m->ifindex == link->ifindex)); r = route_new(&tmp); if (r < 0) return r; route_copy(tmp, in, m); in = tmp; } r = route_get(manager, link, in, &route); if (r == -ENOENT) { /* Route does not exist, create a new one */ r = route_add_internal(manager, link, link ? &link->routes : &manager->routes, in, &route); if (r < 0) return r; } else if (r == 0) { /* Take over a foreign route */ if (link) { r = set_ensure_put(&link->routes, &route_hash_ops, route); if (r < 0) return r; set_remove(link->routes_foreign, route); } else { r = set_ensure_put(&manager->routes, &route_hash_ops, route); if (r < 0) return r; set_remove(manager->routes_foreign, route); } } else if (r == 1) { /* Route exists, do nothing */ ; } else return r; if (ret) *ret = route; return 0; } 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 void log_route_debug(const Route *route, const char *str, const Link *link) { assert(route); assert(str); /* link may be NULL. */ if (DEBUG_LOGGING) { _cleanup_free_ char *dst = NULL, *dst_prefixlen = NULL, *src = NULL, *gw = NULL, *prefsrc = NULL; char scope[ROUTE_SCOPE_STR_MAX], table[ROUTE_TABLE_STR_MAX], protocol[ROUTE_PROTOCOL_STR_MAX]; if (!in_addr_is_null(route->family, &route->dst)) { (void) in_addr_to_string(route->family, &route->dst, &dst); (void) asprintf(&dst_prefixlen, "/%u", route->dst_prefixlen); } if (!in_addr_is_null(route->family, &route->src)) (void) in_addr_to_string(route->family, &route->src, &src); if (!in_addr_is_null(route->gw_family, &route->gw)) (void) in_addr_to_string(route->gw_family, &route->gw, &gw); if (!in_addr_is_null(route->family, &route->prefsrc)) (void) in_addr_to_string(route->family, &route->prefsrc, &prefsrc); log_link_debug(link, "%s route: dst: %s%s, src: %s, gw: %s, prefsrc: %s, scope: %s, table: %s, proto: %s, type: %s", str, strna(dst), strempty(dst_prefixlen), strna(src), strna(gw), strna(prefsrc), format_route_scope(route->scope, scope, sizeof(scope)), format_route_table(route->table, table, sizeof(table)), format_route_protocol(route->protocol, protocol, sizeof(protocol)), strna(route_type_to_string(route->type))); } } static int route_set_netlink_message(const Route *route, sd_netlink_message *req, Link *link) { unsigned flags; int r; assert(route); assert(req); /* link may be NULL */ if (in_addr_is_null(route->gw_family, &route->gw) == 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 log_link_error_errno(link, r, "Could not append RTA_GATEWAY attribute: %m"); } 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 log_link_error_errno(link, r, "Could not append RTA_VIA attribute: %m"); } } if (route->dst_prefixlen > 0) { r = netlink_message_append_in_addr_union(req, RTA_DST, route->family, &route->dst); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_DST attribute: %m"); r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen); if (r < 0) return log_link_error_errno(link, r, "Could not set destination prefix length: %m"); } if (route->src_prefixlen > 0) { r = netlink_message_append_in_addr_union(req, RTA_SRC, route->family, &route->src); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_SRC attribute: %m"); r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen); if (r < 0) return log_link_error_errno(link, r, "Could not set source prefix length: %m"); } if (in_addr_is_null(route->family, &route->prefsrc) == 0) { r = netlink_message_append_in_addr_union(req, RTA_PREFSRC, route->family, &route->prefsrc); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_PREFSRC attribute: %m"); } r = sd_rtnl_message_route_set_scope(req, route->scope); if (r < 0) return log_link_error_errno(link, r, "Could not set scope: %m"); flags = route->flags; if (route->gateway_onlink >= 0) SET_FLAG(flags, RTNH_F_ONLINK, route->gateway_onlink); r = sd_rtnl_message_route_set_flags(req, flags); if (r < 0) return log_link_error_errno(link, r, "Could not set flags: %m"); if (route->table != RT_TABLE_MAIN) { if (route->table < 256) { r = sd_rtnl_message_route_set_table(req, route->table); if (r < 0) return log_link_error_errno(link, r, "Could not set route table: %m"); } else { r = sd_rtnl_message_route_set_table(req, RT_TABLE_UNSPEC); if (r < 0) return log_link_error_errno(link, r, "Could not set route table: %m"); /* Table attribute to allow more than 256. */ r = sd_netlink_message_append_data(req, RTA_TABLE, &route->table, sizeof(route->table)); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_TABLE attribute: %m"); } } r = sd_rtnl_message_route_set_type(req, route->type); if (r < 0) return log_link_error_errno(link, r, "Could not set route type: %m"); if (!route_type_is_reject(route)) { 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 log_link_error_errno(link, r, "Could not append RTA_OIF attribute: %m"); } r = sd_netlink_message_append_u8(req, RTA_PREF, route->pref); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_PREF attribute: %m"); r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_PRIORITY attribute: %m"); return 0; } static int route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(m); /* Note that link may be NULL. */ if (link && IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; 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( const Route *route, Manager *manager, Link *link, link_netlink_message_handler_t callback) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link || manager); assert(IN_SET(route->family, AF_INET, AF_INET6)); if (!manager) manager = link->manager; /* link may be NULL! */ log_route_debug(route, "Removing", link); 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 RTM_DELROUTE message: %m"); r = route_set_netlink_message(route, req, link); if (r < 0) return r; r = netlink_call_async(manager->rtnl, NULL, req, callback ?: route_remove_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); /* link may be NULL, link_ref() is OK with that */ return 0; } static bool link_has_route(const Link *link, const Route *route) { Route *net_route; assert(link); assert(route); if (!link->network) return false; HASHMAP_FOREACH(net_route, link->network->routes_by_section) if (route_equal(net_route, route)) return true; return false; } static bool links_have_route(const Manager *manager, const Route *route, const Link *except) { Link *link; assert(manager); HASHMAP_FOREACH(link, manager->links) { if (link == except) continue; if (link_has_route(link, route)) return true; } return false; } static int manager_drop_routes_internal(Manager *manager, bool foreign, const Link *except) { Route *route; int k, r = 0; Set *routes; assert(manager); routes = foreign ? manager->routes_foreign : manager->routes; SET_FOREACH(route, routes) { /* Do not touch routes managed by the kernel */ if (route->protocol == RTPROT_KERNEL) continue; /* The route will be configured later, or already configured by a link */ if (links_have_route(manager, route, except)) continue; /* The existing links do not have the route. Let's drop this now. It may by * re-configured later. */ k = route_remove(route, manager, NULL, NULL); if (k < 0 && r >= 0) r = k; } return r; } static int manager_drop_foreign_routes(Manager *manager) { return manager_drop_routes_internal(manager, true, NULL); } static int manager_drop_routes(Manager *manager, const Link *except) { return manager_drop_routes_internal(manager, false, except); } int link_drop_foreign_routes(Link *link) { Route *route; int k, r = 0; assert(link); assert(link->manager); SET_FOREACH(route, link->routes_foreign) { /* do not touch routes managed by the kernel */ if (route->protocol == RTPROT_KERNEL) continue; /* do not touch multicast route added by kernel */ /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that. * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */ if (route->protocol == RTPROT_BOOT && route->family == AF_INET6 && route->dst_prefixlen == 8 && in_addr_equal(AF_INET6, &route->dst, &(union in_addr_union) { .in6 = {{{ 0xff,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }}} })) continue; if (route->protocol == RTPROT_STATIC && link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC)) continue; if (route->protocol == RTPROT_DHCP && link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) continue; if (link_has_route(link, route)) k = route_add(NULL, link, route, NULL, NULL); else k = route_remove(route, NULL, link, NULL); if (k < 0 && r >= 0) r = k; } k = manager_drop_foreign_routes(link->manager); if (k < 0 && r >= 0) r = k; return r; } int link_drop_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->protocol == RTPROT_KERNEL) continue; k = route_remove(route, NULL, link, NULL); if (k < 0 && r >= 0) r = k; } k = manager_drop_routes(link->manager, link); if (k < 0 && r >= 0) r = k; return r; } static int route_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) { Route *route = userdata; int r; assert(route); r = route_remove(route, route->manager, route->link, NULL); if (r < 0) { log_link_warning_errno(route->link, r, "Could not remove route: %m"); route_free(route); } return 1; } static int route_add_and_setup_timer(Link *link, const Route *route, const MultipathRoute *m, Route **ret) { _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL; Route *nr; int r; assert(link); assert(route); if (route_type_is_reject(route)) r = route_add(link->manager, NULL, route, NULL, &nr); else if (!m || m->ifindex == 0 || m->ifindex == link->ifindex) r = route_add(NULL, link, route, m, &nr); else { Link *link_gw; r = link_get(link->manager, m->ifindex, &link_gw); if (r < 0) return log_link_error_errno(link, r, "Failed to get link with ifindex %d: %m", m->ifindex); r = route_add(NULL, link_gw, route, m, &nr); } if (r < 0) return log_link_error_errno(link, r, "Could not add route: %m"); /* TODO: drop expiration handling once it can be pushed into the kernel */ if (nr->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) { r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), nr->lifetime, 0, route_expire_handler, nr); if (r < 0) return log_link_error_errno(link, r, "Could not arm expiration timer: %m"); } sd_event_source_unref(nr->expire); nr->expire = TAKE_PTR(expire); if (ret) *ret = nr; return 0; } static int append_nexthop_one(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, .rtnh_hops = m->weight > 0 ? m->weight - 1 : 0, }; (*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 Route *route, sd_netlink_message *req) { _cleanup_free_ struct rtattr *rta = NULL; struct rtnexthop *rtnh; MultipathRoute *m; size_t offset; int r; 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(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( const Route *route, Link *link, link_netlink_message_handler_t callback, Route **ret) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); assert(link->ifindex > 0); assert(IN_SET(route->family, AF_INET, AF_INET6)); assert(callback); if (route_get(link->manager, link, route, NULL) <= 0 && set_size(link->routes) >= routes_max()) return log_link_error_errno(link, SYNTHETIC_ERRNO(E2BIG), "Too many routes are configured, refusing: %m"); log_route_debug(route, "Configuring", link); r = sd_rtnl_message_new_route(link->manager->rtnl, &req, RTM_NEWROUTE, route->family, route->protocol); if (r < 0) return log_link_error_errno(link, r, "Could not create RTM_NEWROUTE message: %m"); r = route_set_netlink_message(route, req, link); if (r < 0) return r; if (route->lifetime != USEC_INFINITY && kernel_route_expiration_supported()) { r = sd_netlink_message_append_u32(req, RTA_EXPIRES, DIV_ROUND_UP(usec_sub_unsigned(route->lifetime, now(clock_boottime_or_monotonic())), USEC_PER_SEC)); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_EXPIRES attribute: %m"); } if (route->ttl_propagate >= 0) { r = sd_netlink_message_append_u8(req, RTA_TTL_PROPAGATE, route->ttl_propagate); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_TTL_PROPAGATE attribute: %m"); } r = sd_netlink_message_open_container(req, RTA_METRICS); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_METRICS attribute: %m"); if (route->mtu > 0) { r = sd_netlink_message_append_u32(req, RTAX_MTU, route->mtu); if (r < 0) return log_link_error_errno(link, r, "Could not append RTAX_MTU attribute: %m"); } if (route->initcwnd > 0) { r = sd_netlink_message_append_u32(req, RTAX_INITCWND, route->initcwnd); if (r < 0) return log_link_error_errno(link, r, "Could not append RTAX_INITCWND attribute: %m"); } if (route->initrwnd > 0) { r = sd_netlink_message_append_u32(req, RTAX_INITRWND, route->initrwnd); if (r < 0) return log_link_error_errno(link, r, "Could not append RTAX_INITRWND attribute: %m"); } if (route->quickack >= 0) { r = sd_netlink_message_append_u32(req, RTAX_QUICKACK, route->quickack); if (r < 0) return log_link_error_errno(link, r, "Could not append RTAX_QUICKACK attribute: %m"); } if (route->fast_open_no_cookie >= 0) { r = sd_netlink_message_append_u32(req, RTAX_FASTOPEN_NO_COOKIE, route->fast_open_no_cookie); if (r < 0) return log_link_error_errno(link, r, "Could not append RTAX_FASTOPEN_NO_COOKIE attribute: %m"); } if (route->advmss > 0) { r = sd_netlink_message_append_u32(req, RTAX_ADVMSS, route->advmss); if (r < 0) return log_link_error_errno(link, r, "Could not append RTAX_ADVMSS attribute: %m"); } r = sd_netlink_message_close_container(req); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_METRICS attribute: %m"); r = append_nexthops(route, req); if (r < 0) return log_link_error_errno(link, r, "Could not append RTA_MULTIPATH attribute: %m"); if (ordered_set_isempty(route->multipath_routes)) { Route *nr; r = route_add_and_setup_timer(link, route, NULL, &nr); if (r < 0) return r; if (ret) *ret = nr; } else { MultipathRoute *m; assert(!ret); ORDERED_SET_FOREACH(m, route->multipath_routes) { r = route_add_and_setup_timer(link, route, m, NULL); if (r < 0) return r; } } r = netlink_call_async(link->manager->rtnl, NULL, req, callback, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); return 0; } static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); assert(link->route_messages > 0); link->route_messages--; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; 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 1; } if (link->route_messages == 0) { log_link_debug(link, "Routes set"); link->static_routes_configured = true; link_set_nexthop(link); } return 1; } int link_set_routes(Link *link) { enum { PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */ PHASE_GATEWAY, /* Second phase: Routes with a gateway */ _PHASE_MAX } phase; Route *rt; int r; assert(link); assert(link->network); assert(link->state != _LINK_STATE_INVALID); link->static_routes_configured = false; if (!link->addresses_ready) return 0; if (!link_has_carrier(link) && !link->network->configure_without_carrier) /* During configuring addresses, the link lost its carrier. As networkd is dropping * the addresses now, let's not configure the routes either. */ return 0; if (link->route_messages != 0) { log_link_debug(link, "Static routes are configuring."); return 0; } r = link_set_routing_policy_rules(link); if (r < 0) return r; /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */ for (phase = 0; phase < _PHASE_MAX; phase++) HASHMAP_FOREACH(rt, link->network->routes_by_section) { if (rt->gateway_from_dhcp_or_ra) continue; if ((in_addr_is_null(rt->gw_family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY)) continue; r = route_configure(rt, link, route_handler, NULL); if (r < 0) return log_link_warning_errno(link, r, "Could not set routes: %m"); link->route_messages++; } if (link->route_messages == 0) { link->static_routes_configured = true; link_set_nexthop(link); } else { log_link_debug(link, "Setting routes"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } static int process_route_one(Manager *manager, Link *link, uint16_t type, const Route *tmp, const MultipathRoute *m) { _cleanup_(route_freep) Route *nr = NULL; Route *route = NULL; int r; assert(manager); assert(tmp); assert(IN_SET(type, RTM_NEWROUTE, RTM_DELROUTE)); if (m) { if (link) return log_link_warning_errno(link, SYNTHETIC_ERRNO(EINVAL), "rtnl: received route contains both RTA_OIF and RTA_MULTIPATH, ignoring."); if (m->ifindex <= 0) return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received multipath route with invalid ifindex, ignoring."); r = link_get(manager, m->ifindex, &link); if (r < 0) { log_warning_errno(r, "rtnl: received multipath route for link (%d) we do not know, ignoring: %m", m->ifindex); return 0; } r = route_new(&nr); if (r < 0) return log_oom(); route_copy(nr, tmp, m); tmp = nr; } (void) route_get(manager, link, tmp, &route); switch (type) { case RTM_NEWROUTE: if (!route) { if (!manager->manage_foreign_routes) log_route_debug(tmp, "Ignoring received foreign", link); else { /* A route appeared that we did not request */ log_route_debug(tmp, "Remembering foreign", link); r = route_add_foreign(manager, link, tmp, NULL); if (r < 0) { log_link_warning_errno(link, r, "Failed to remember foreign route, ignoring: %m"); return 0; } } } else log_route_debug(tmp, "Received remembered", link); break; case RTM_DELROUTE: log_route_debug(tmp, route ? "Forgetting" : manager->manage_foreign_routes ? "Kernel removed unknown" : "Ignoring received foreign", link); route_free(route); break; default: assert_not_reached("Received route message with invalid RTNL message type"); } return 1; } int manager_rtnl_process_route(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) { _cleanup_ordered_set_free_free_ OrderedSet *multipath_routes = NULL; _cleanup_(route_freep) Route *tmp = NULL; _cleanup_free_ void *rta_multipath = NULL; Link *link = NULL; uint32_t ifindex; uint16_t type; unsigned char table; 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(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: %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_rtnl_message_route_get_table(message, &table); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received route message with invalid table, ignoring: %m"); return 0; } tmp->table = table; 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_enter_container(message, RTA_METRICS); if (r < 0 && r != -ENODATA) { log_link_error_errno(link, r, "rtnl: Could not enter RTA_METRICS container: %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: %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, &multipath_routes); if (r < 0) { log_link_warning_errno(link, r, "rtnl: failed to parse RTA_MULTIPATH attribute, ignoring: %m"); return 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 (ordered_set_isempty(multipath_routes)) (void) process_route_one(m, link, type, tmp, NULL); else { MultipathRoute *mr; ORDERED_SET_FOREACH(mr, multipath_routes) { r = process_route_one(m, link, type, tmp, mr); if (r < 0) break; } } 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(lvalue); 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; } 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, 0, "Unknown route scope: %s", rvalue); return 0; } n->scope = r; n->scope_set = true; 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 = route_table_from_string(rvalue); if (r >= 0) n->table = r; else { r = safe_atou32(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("Invalid lvalue"); 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) n->protocol = r; else { r = safe_atou8(rvalue , &n->protocol); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse route protocol \"%s\", ignoring assignment: %m", rvalue); return 0; } } 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, 0, "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 (streq(lvalue, "InitialCongestionWindow")) n->initcwnd = k; else if (streq(lvalue, "InitialAdvertisedReceiveWindow")) n->initrwnd = k; else assert_not_reached("Invalid TCP window type."); 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_(route_free_or_set_invalidp) Route *n = NULL; _cleanup_free_ char *word = NULL, *buf = NULL; _cleanup_free_ MultipathRoute *m = NULL; Network *network = userdata; const char *p, *ip, *dev; union in_addr_union a; int family, 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->multipath_routes = ordered_set_free_free(n->multipath_routes); 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) { buf = strndup(word, dev - word); if (!buf) return log_oom(); ip = buf; dev++; } else ip = word; r = in_addr_from_string_auto(ip, &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 (dev) { r = resolve_interface(NULL, dev); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid interface name or index, ignoring assignment: %s", dev); return 0; } m->ifindex = r; } 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; } 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; } } r = ordered_set_ensure_allocated(&n->multipath_routes, NULL); if (r < 0) return log_oom(); r = ordered_set_put(n->multipath_routes, m); 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; 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; } 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 (ordered_hashmap_isempty(network->addresses_by_section) && in_addr_is_null(route->gw_family, &route->gw) == 0 && route->gateway_onlink < 0) { log_warning("%s: Gateway= without static address configured. " "Enabling GatewayOnLink= option.", network->filename); route->gateway_onlink = true; } 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); }