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systemd/src/network/networkd-route.c
Yu Watanabe 4444c2baf5 network/route: move two more conf parsers to networkd-route-nexthop.[ch] 
Let's manage nexthop (gateway) handling in networkd-route-nexthop.[ch].
2024-01-12 09:44:03 +09:00

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/* 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,
.gateway_onlink = -1,
};
*ret = TAKE_PTR(route);
return 0;
}
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);
route_metric_done(&route->metric);
sd_event_source_disable_unref(route->expire);
return mfree(route);
}
static void route_hash_func(const Route *route, struct siphash *state) {
assert(route);
siphash24_compress_typesafe(route->family, state);
switch (route->family) {
case AF_INET:
case AF_INET6:
siphash24_compress_typesafe(route->dst_prefixlen, state);
in_addr_hash_func(&route->dst, route->family, state);
siphash24_compress_typesafe(route->src_prefixlen, state);
in_addr_hash_func(&route->src, route->family, state);
siphash24_compress_typesafe(route->gw_family, state);
if (IN_SET(route->gw_family, AF_INET, AF_INET6)) {
in_addr_hash_func(&route->gw, route->gw_family, state);
siphash24_compress_typesafe(route->gw_weight, state);
}
in_addr_hash_func(&route->prefsrc, route->family, state);
siphash24_compress_typesafe(route->tos, state);
siphash24_compress_typesafe(route->priority, state);
siphash24_compress_typesafe(route->table, state);
siphash24_compress_typesafe(route->protocol, state);
siphash24_compress_typesafe(route->scope, state);
siphash24_compress_typesafe(route->type, state);
route_metric_hash_func(&route->metric, state);
siphash24_compress_typesafe(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 = route_metric_compare_func(&a->metric, &b->metric);
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->metric = ROUTE_METRIC_NULL;
dest->expire = NULL;
r = route_metric_copy(&src->metric, &dest->metric);
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 = nexthop_get_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);
(void) link_get_by_index(manager, nh->ifindex, c->links);
*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 = nexthop_get_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);
(void) link_get_by_index(manager, h->ifindex, c->links + i);
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;
}
/* metrics */
r = route_metric_set_netlink_message(&route->metric, 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;
r = nexthop_is_ready(link->manager, route->nexthop_id, &nh);
if (r <= 0)
return r;
HASHMAP_FOREACH(nhg, nh->group) {
r = nexthop_is_ready(link->manager, nhg->id, NULL);
if (r <= 0)
return r;
}
}
if (in_addr_is_set(route->family, &route->prefsrc) > 0) {
r = manager_has_address(link->manager, route->family, &route->prefsrc);
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;
}
/* metrics */
if (route_metric_read_netlink_message(&tmp->metric, message) < 0)
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 *route = 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, &route);
if (r < 0)
return r;
r = in_addr_from_string(AF_INET, "169.254.0.0", &route->dst);
if (r < 0)
return r;
route->family = AF_INET;
route->dst_prefixlen = 16;
route->scope = RT_SCOPE_LINK;
route->scope_set = true;
route->table_set = true;
route->priority = IPV4LL_ROUTE_METRIC;
route->protocol = RTPROT_STATIC;
TAKE_PTR(route);
return 0;
}
int network_add_default_route_on_device(Network *network) {
_cleanup_(route_free_or_set_invalidp) Route *route = 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, &route);
if (r < 0)
return r;
route->family = AF_INET;
route->scope = RT_SCOPE_LINK;
route->scope_set = true;
route->protocol = RTPROT_STATIC;
TAKE_PTR(route);
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 *route = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = route_new_static(network, filename, section_line, &route);
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 (route->family == AF_UNSPEC)
r = in_addr_from_string_auto(rvalue, &route->family, &route->prefsrc);
else
r = in_addr_from_string(route->family, rvalue, &route->prefsrc);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, EINVAL,
"Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
return 0;
}
TAKE_PTR(route);
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 *route = 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, &route);
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 = &route->dst;
prefixlen = &route->dst_prefixlen;
} else if (streq(lvalue, "Source")) {
buffer = &route->src;
prefixlen = &route->src_prefixlen;
} else
assert_not_reached();
if (route->family == AF_UNSPEC)
r = in_addr_prefix_from_string_auto(rvalue, &route->family, buffer, prefixlen);
else
r = in_addr_prefix_from_string(rvalue, route->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(route->family, buffer, *prefixlen);
TAKE_PTR(route);
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 *route = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = route_new_static(network, filename, section_line, &route);
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, &route->priority);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Could not parse route priority \"%s\", ignoring assignment: %m", rvalue);
return 0;
}
route->priority_set = true;
TAKE_PTR(route);
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 *route = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = route_new_static(network, filename, section_line, &route);
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;
}
route->scope = r;
route->scope_set = true;
TAKE_PTR(route);
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 *route = NULL;
Network *network = userdata;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = route_new_static(network, filename, section_line, &route);
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, &route->table);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Could not parse route table \"%s\", ignoring assignment: %m", rvalue);
return 0;
}
route->table_set = true;
TAKE_PTR(route);
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 *route = NULL;
int r;
r = route_new_static(network, filename, section_line, &route);
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"))
route->pref = ICMPV6_ROUTER_PREF_LOW;
else if (streq(rvalue, "medium"))
route->pref = ICMPV6_ROUTER_PREF_MEDIUM;
else if (streq(rvalue, "high"))
route->pref = ICMPV6_ROUTER_PREF_HIGH;
else {
log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown route preference: %s", rvalue);
return 0;
}
route->pref_set = true;
TAKE_PTR(route);
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 *route = NULL;
int r;
r = route_new_static(network, filename, section_line, &route);
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;
}
route->protocol = r;
TAKE_PTR(route);
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 *route = NULL;
int t, r;
r = route_new_static(network, filename, section_line, &route);
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;
}
route->type = (unsigned char) t;
TAKE_PTR(route);
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);
}
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