diff options
Diffstat (limited to '')
| -rw-r--r-- | src/network/networkd-route.c | 2996 |
1 files changed, 2996 insertions, 0 deletions
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c new file mode 100644 index 0000000..88e9ad5 --- /dev/null +++ b/src/network/networkd-route.c @@ -0,0 +1,2996 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <linux/icmpv6.h> +#include <linux/ipv6_route.h> +#include <linux/nexthop.h> + +#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); + + free(route->tcp_congestion_control_algo); + + 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; + int r; + + /* 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; + dest->tcp_congestion_control_algo = NULL; + + r = free_and_strdup(&dest->tcp_congestion_control_algo, src->tcp_congestion_control_algo); + if (r < 0) + return r; + + *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) { + Route *route; + + assert(link); + + SET_FOREACH(route, link->routes) { + if (route->source != source) + 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, *gw_alloc = NULL, *prefsrc = NULL, + *table = NULL, *scope = NULL, *proto = NULL, *flags = NULL; + const char *gw = NULL, *dst, *src; + + assert(route); + assert(str); + assert(manager); + + /* link may be NULL. */ + + if (!DEBUG_LOGGING) + return; + + (void) network_config_state_to_string_alloc(route->state, &state); + + dst = in_addr_is_set(route->family, &route->dst) || route->dst_prefixlen > 0 ? + IN_ADDR_PREFIX_TO_STRING(route->family, &route->dst, route->dst_prefixlen) : NULL; + src = in_addr_is_set(route->family, &route->src) || route->src_prefixlen > 0 ? + IN_ADDR_PREFIX_TO_STRING(route->family, &route->src, route->src_prefixlen) : NULL; + + 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, "@%i", 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; +} + +int route_remove_and_drop(Route *route) { + if (!route) + return 0; + + route_cancel_request(route, NULL); + + if (route_exists(route)) + return route_remove(route); + + if (route->state == 0) + route_free(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 = ASSERT_PTR(userdata); + Link *link; + int r; + + 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, uint32_t lifetime_sec, 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 (lifetime_sec != UINT32_MAX) { + r = sd_netlink_message_append_u32(m, RTA_EXPIRES, lifetime_sec); + 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; + } + + if (!isempty(route->tcp_congestion_control_algo)) { + r = sd_netlink_message_append_string(m, RTAX_CC_ALGO, route->tcp_congestion_control_algo); + 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, /* allow_unmanaged = */ true) || + !link_has_carrier(l)) + 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(link->manager); + 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; + } + } + } + + usec_t now_usec; + assert_se(sd_event_now(link->manager->event, CLOCK_BOOTTIME, &now_usec) >= 0); + uint32_t sec = usec_to_sec(route->lifetime_usec, now_usec); + if (sec == 0) { + log_link_debug(link, "Refuse to configure %s route with zero lifetime.", + network_config_source_to_string(route->source)); + + 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_cancel_requesting(existing); + } + else + route_cancel_requesting(route); + + return 1; + } + + r = route_configure(route, sec, 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 = NULL; + int r; + + assert(link); + assert(link->manager); + assert(route); + assert(route->source != NETWORK_CONFIG_SOURCE_FOREIGN); + assert(!route_needs_convert(route)); + + (void) route_get(link->manager, link, route, &existing); + + if (route->lifetime_usec == 0) { + if (consume_object) + route_free(route); + + /* The requested route is outdated. Let's remove it. */ + return route_remove_and_drop(existing); + } + + if (!existing) { + _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 %u, 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 (%u) 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 \"%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_congestion( + 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_string(unit, filename, line, section, section_line, lvalue, ltype, + rvalue, &n->tcp_congestion_control_algo, userdata); + if (r < 0) + return r; + + 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); + TAKE_PTR(n); + 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); +} |