Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3148 insertions, 0 deletions

diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
new file mode 100644
index 0000000..eb502ae
--- /dev/null
+++ b/src/network/networkd-route.c
@@ -0,0 +1,3148 @@
+/* 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, /* append_num = */ true, &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 r = 0;
+
+        assert(manager);
+
+        SET_FOREACH(route, manager->routes) {
+                if (!route_is_marked(route))
+                        continue;
+
+                RET_GATHER(r, route_remove(route));
+        }
+
+        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) {
+        assert(link);
+
+        if (!link->netdev || link->netdev->kind != NETDEV_KIND_WIREGUARD)
+                return;
+
+        Route *route, *existing;
+        Wireguard *w = WIREGUARD(link->netdev);
+
+        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 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;
+
+                RET_GATHER(r, route_remove(route));
+        }
+
+        manager_mark_routes(link->manager, /* foreign = */ true, NULL);
+
+        return RET_GATHER(r, manager_drop_marked_routes(link->manager));
+}
+
+int link_drop_managed_routes(Link *link) {
+        Route *route;
+        int 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;
+
+                RET_GATHER(r, route_remove(route));
+        }
+
+        manager_mark_routes(link->manager, /* foreign = */ false, link);
+
+        return RET_GATHER(r, manager_drop_marked_routes(link->manager));
+}
+
+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;
+        }
+
+        if (route->hop_limit > 0) {
+                r = sd_netlink_message_append_u32(m, RTAX_HOPLIMIT, route->hop_limit);
+                if (r < 0)
+                        return r;
+        }
+
+        if (route->tcp_rto_usec > 0) {
+                r = sd_netlink_message_append_u32(m, RTAX_RTO_MIN, DIV_ROUND_UP(route->tcp_rto_usec, USEC_PER_MSEC));
+                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;
+        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;
+
+        Wireguard *w = WIREGUARD(netdev);
+
+        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;
+        bool update_dhcp4;
+        int r;
+
+        assert(manager);
+        assert(tmp);
+        assert(IN_SET(type, RTM_NEWROUTE, RTM_DELROUTE));
+
+        /* link may be NULL. This consumes 'in'. */
+
+        update_dhcp4 = link && tmp->family == AF_INET6 && tmp->dst_prefixlen == 0;
+
+        (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();
+        }
+
+        if (update_dhcp4) {
+                r = dhcp4_update_ipv6_connectivity(link);
+                if (r < 0) {
+                        log_link_warning_errno(link, r, "Failed to notify IPv6 connectivity to DHCPv4 client: %m");
+                        link_enter_failed(link);
+                }
+        }
+
+        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) {
+                        /* 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;
+
+        r = hashmap_by_section_find_unused_line(network->routes_by_section, network->filename, &section_line);
+        if (r < 0)
+                return r;
+
+        /* 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;
+
+        r = hashmap_by_section_find_unused_line(network->routes_by_section, network->filename, &section_line);
+        if (r < 0)
+                return r;
+
+        /* 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_route_hop_limit(
+                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;
+        }
+
+        if (isempty(rvalue)) {
+                n->hop_limit = 0;
+                TAKE_PTR(n);
+                return 0;
+        }
+
+        r = safe_atou32(rvalue, &k);
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r,
+                           "Could not parse per route hop limit, ignoring assignment: %s", rvalue);
+                return 0;
+        }
+        if (k > 255) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Specified per route hop limit \"%s\" is too large, ignoring assignment: %m", rvalue);
+                return 0;
+        }
+        if (k == 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Invalid per route hop limit \"%s\", ignoring assignment: %m", rvalue);
+                return 0;
+        }
+
+        n->hop_limit = k;
+
+        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) {
+
+        uint32_t *window = ASSERT_PTR(data);
+        uint32_t k;
+        int r;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        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;
+        }
+
+        *window = k;
+        return 0;
+}
+
+int config_parse_route_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 *d;
+        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, "InitialCongestionWindow"))
+                d = &n->initcwnd;
+        else if (streq(lvalue, "InitialAdvertisedReceiveWindow"))
+                d = &n->initrwnd;
+        else
+                assert_not_reached();
+
+        r = config_parse_tcp_window(unit, filename, line, section, section_line, lvalue, ltype, rvalue, d, userdata);
+        if (r < 0)
+                return r;
+
+        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_route_tcp_rto(
+                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;
+        usec_t usec;
+        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_sec(rvalue, &usec);
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r,
+                           "Failed to parse route TCP retransmission timeout (RTO), ignoring assignment: %s", rvalue);
+                return 0;
+        }
+
+        if (IN_SET(usec, 0, USEC_INFINITY) ||
+            DIV_ROUND_UP(usec, USEC_PER_MSEC) > UINT32_MAX) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Route TCP retransmission timeout (RTO) must be in the range 0…%"PRIu32"ms, ignoring assignment: %s", UINT32_MAX, rvalue);
+                return 0;
+        }
+
+        n->tcp_rto_usec = usec;
+
+        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);
+}