src/network/networkd-route.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <linux/icmpv6.h>
   4
   5 #include "alloc-util.h"
   6 #include "conf-parser.h"
   7 #include "in-addr-util.h"
   8 #include "missing_network.h"
   9 #include "netlink-util.h"
  10 #include "networkd-manager.h"
  11 #include "networkd-route.h"
  12 #include "parse-util.h"
  13 #include "set.h"
  14 #include "string-util.h"
  15 #include "sysctl-util.h"
  16 #include "util.h"
  17
  18 #define ROUTES_DEFAULT_MAX_PER_FAMILY 4096U
  19
  20 static unsigned routes_max(void) {
  21         static thread_local unsigned cached = 0;
  22
  23         _cleanup_free_ char *s4 = NULL, *s6 = NULL;
  24         unsigned val4 = ROUTES_DEFAULT_MAX_PER_FAMILY, val6 = ROUTES_DEFAULT_MAX_PER_FAMILY;
  25
  26         if (cached > 0)
  27                 return cached;
  28
  29         if (sysctl_read("net/ipv4/route/max_size", &s4) >= 0) {
  30                 truncate_nl(s4);
  31                 if (safe_atou(s4, &val4) >= 0 &&
  32                     val4 == 2147483647U)
  33                         /* This is the default "no limit" value in the kernel */
  34                         val4 = ROUTES_DEFAULT_MAX_PER_FAMILY;
  35         }
  36
  37         if (sysctl_read("net/ipv6/route/max_size", &s6) >= 0) {
  38                 truncate_nl(s6);
  39                 (void) safe_atou(s6, &val6);
  40         }
  41
  42         cached = MAX(ROUTES_DEFAULT_MAX_PER_FAMILY, val4) +
  43                  MAX(ROUTES_DEFAULT_MAX_PER_FAMILY, val6);
  44         return cached;
  45 }
  46
  47 int route_new(Route **ret) {
  48         _cleanup_(route_freep) Route *route = NULL;
  49
  50         route = new(Route, 1);
  51         if (!route)
  52                 return -ENOMEM;
  53
  54         *route = (Route) {
  55                 .family = AF_UNSPEC,
  56                 .scope = RT_SCOPE_UNIVERSE,
  57                 .protocol = RTPROT_UNSPEC,
  58                 .type = RTN_UNICAST,
  59                 .table = RT_TABLE_MAIN,
  60                 .lifetime = USEC_INFINITY,
  61                 .quickack = -1,
  62                 .gateway_onlink = -1,
  63         };
  64
  65         *ret = TAKE_PTR(route);
  66
  67         return 0;
  68 }
  69
  70 static int route_new_static(Network *network, const char *filename, unsigned section_line, Route **ret) {
  71         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  72         _cleanup_(route_freep) Route *route = NULL;
  73         int r;
  74
  75         assert(network);
  76         assert(ret);
  77         assert(!!filename == (section_line > 0));
  78
  79         if (filename) {
  80                 r = network_config_section_new(filename, section_line, &n);
  81                 if (r < 0)
  82                         return r;
  83
  84                 route = hashmap_get(network->routes_by_section, n);
  85                 if (route) {
  86                         *ret = TAKE_PTR(route);
  87
  88                         return 0;
  89                 }
  90         }
  91
  92         if (network->n_static_routes >= routes_max())
  93                 return -E2BIG;
  94
  95         r = route_new(&route);
  96         if (r < 0)
  97                 return r;
  98
  99         route->protocol = RTPROT_STATIC;
 100         route->network = network;
 101         LIST_PREPEND(routes, network->static_routes, route);
 102         network->n_static_routes++;
 103
 104         if (filename) {
 105                 route->section = TAKE_PTR(n);
 106
 107                 r = hashmap_ensure_allocated(&network->routes_by_section, &network_config_hash_ops);
 108                 if (r < 0)
 109                         return r;
 110
 111                 r = hashmap_put(network->routes_by_section, route->section, route);
 112                 if (r < 0)
 113                         return r;
 114         }
 115
 116         *ret = TAKE_PTR(route);
 117
 118         return 0;
 119 }
 120
 121 void route_free(Route *route) {
 122         if (!route)
 123                 return;
 124
 125         if (route->network) {
 126                 LIST_REMOVE(routes, route->network->static_routes, route);
 127
 128                 assert(route->network->n_static_routes > 0);
 129                 route->network->n_static_routes--;
 130
 131                 if (route->section)
 132                         hashmap_remove(route->network->routes_by_section, route->section);
 133         }
 134
 135         network_config_section_free(route->section);
 136
 137         if (route->link) {
 138                 set_remove(route->link->routes, route);
 139                 set_remove(route->link->routes_foreign, route);
 140         }
 141
 142         sd_event_source_unref(route->expire);
 143
 144         free(route);
 145 }
 146
 147 static void route_hash_func(const Route *route, struct siphash *state) {
 148         assert(route);
 149
 150         siphash24_compress(&route->family, sizeof(route->family), state);
 151
 152         switch (route->family) {
 153         case AF_INET:
 154         case AF_INET6:
 155                 /* Equality of routes are given by the 4-touple
 156                    (dst_prefix,dst_prefixlen,tos,priority,table) */
 157                 siphash24_compress(&route->dst, FAMILY_ADDRESS_SIZE(route->family), state);
 158                 siphash24_compress(&route->dst_prefixlen, sizeof(route->dst_prefixlen), state);
 159                 siphash24_compress(&route->tos, sizeof(route->tos), state);
 160                 siphash24_compress(&route->priority, sizeof(route->priority), state);
 161                 siphash24_compress(&route->table, sizeof(route->table), state);
 162
 163                 break;
 164         default:
 165                 /* treat any other address family as AF_UNSPEC */
 166                 break;
 167         }
 168 }
 169
 170 static int route_compare_func(const Route *a, const Route *b) {
 171         int r;
 172
 173         r = CMP(a->family, b->family);
 174         if (r != 0)
 175                 return r;
 176
 177         switch (a->family) {
 178         case AF_INET:
 179         case AF_INET6:
 180                 r = CMP(a->dst_prefixlen, b->dst_prefixlen);
 181                 if (r != 0)
 182                         return r;
 183
 184                 r = CMP(a->tos, b->tos);
 185                 if (r != 0)
 186                         return r;
 187
 188                 r = CMP(a->priority, b->priority);
 189                 if (r != 0)
 190                         return r;
 191
 192                 r = CMP(a->table, b->table);
 193                 if (r != 0)
 194                         return r;
 195
 196                 return memcmp(&a->dst, &b->dst, FAMILY_ADDRESS_SIZE(a->family));
 197         default:
 198                 /* treat any other address family as AF_UNSPEC */
 199                 return 0;
 200         }
 201 }
 202
 203 DEFINE_PRIVATE_HASH_OPS(route_hash_ops, Route, route_hash_func, route_compare_func);
 204
 205 bool route_equal(Route *r1, Route *r2) {
 206         if (r1 == r2)
 207                 return true;
 208
 209         if (!r1 || !r2)
 210                 return false;
 211
 212         return route_compare_func(r1, r2) == 0;
 213 }
 214
 215 int route_get(Link *link,
 216               int family,
 217               const union in_addr_union *dst,
 218               unsigned char dst_prefixlen,
 219               unsigned char tos,
 220               uint32_t priority,
 221               uint32_t table,
 222               Route **ret) {
 223
 224         Route route, *existing;
 225
 226         assert(link);
 227         assert(dst);
 228
 229         route = (Route) {
 230                 .family = family,
 231                 .dst = *dst,
 232                 .dst_prefixlen = dst_prefixlen,
 233                 .tos = tos,
 234                 .priority = priority,
 235                 .table = table,
 236         };
 237
 238         existing = set_get(link->routes, &route);
 239         if (existing) {
 240                 if (ret)
 241                         *ret = existing;
 242                 return 1;
 243         }
 244
 245         existing = set_get(link->routes_foreign, &route);
 246         if (existing) {
 247                 if (ret)
 248                         *ret = existing;
 249                 return 0;
 250         }
 251
 252         return -ENOENT;
 253 }
 254
 255 static int route_add_internal(
 256                 Link *link,
 257                 Set **routes,
 258                 int family,
 259                 const union in_addr_union *dst,
 260                 unsigned char dst_prefixlen,
 261                 unsigned char tos,
 262                 uint32_t priority,
 263                 uint32_t table,
 264                 Route **ret) {
 265
 266         _cleanup_(route_freep) Route *route = NULL;
 267         int r;
 268
 269         assert(link);
 270         assert(routes);
 271         assert(dst);
 272
 273         r = route_new(&route);
 274         if (r < 0)
 275                 return r;
 276
 277         route->family = family;
 278         route->dst = *dst;
 279         route->dst_prefixlen = dst_prefixlen;
 280         route->tos = tos;
 281         route->priority = priority;
 282         route->table = table;
 283
 284         r = set_ensure_allocated(routes, &route_hash_ops);
 285         if (r < 0)
 286                 return r;
 287
 288         r = set_put(*routes, route);
 289         if (r < 0)
 290                 return r;
 291
 292         route->link = link;
 293
 294         if (ret)
 295                 *ret = route;
 296
 297         route = NULL;
 298
 299         return 0;
 300 }
 301
 302 int route_add_foreign(
 303                 Link *link,
 304                 int family,
 305                 const union in_addr_union *dst,
 306                 unsigned char dst_prefixlen,
 307                 unsigned char tos,
 308                 uint32_t priority,
 309                 uint32_t table,
 310                 Route **ret) {
 311
 312         return route_add_internal(link, &link->routes_foreign, family, dst, dst_prefixlen, tos, priority, table, ret);
 313 }
 314
 315 int route_add(Link *link,
 316               int family,
 317               const union in_addr_union *dst,
 318               unsigned char dst_prefixlen,
 319               unsigned char tos,
 320               uint32_t priority,
 321               uint32_t table,
 322               Route **ret) {
 323
 324         Route *route;
 325         int r;
 326
 327         r = route_get(link, family, dst, dst_prefixlen, tos, priority, table, &route);
 328         if (r == -ENOENT) {
 329                 /* Route does not exist, create a new one */
 330                 r = route_add_internal(link, &link->routes, family, dst, dst_prefixlen, tos, priority, table, &route);
 331                 if (r < 0)
 332                         return r;
 333         } else if (r == 0) {
 334                 /* Take over a foreign route */
 335                 r = set_ensure_allocated(&link->routes, &route_hash_ops);
 336                 if (r < 0)
 337                         return r;
 338
 339                 r = set_put(link->routes, route);
 340                 if (r < 0)
 341                         return r;
 342
 343                 set_remove(link->routes_foreign, route);
 344         } else if (r == 1) {
 345                 /* Route exists, do nothing */
 346                 ;
 347         } else
 348                 return r;
 349
 350         if (ret)
 351                 *ret = route;
 352
 353         return 0;
 354 }
 355
 356 void route_update(Route *route,
 357                   const union in_addr_union *src,
 358                   unsigned char src_prefixlen,
 359                   const union in_addr_union *gw,
 360                   const union in_addr_union *prefsrc,
 361                   unsigned char scope,
 362                   unsigned char protocol,
 363                   unsigned char type) {
 364
 365         assert(route);
 366         assert(src || src_prefixlen == 0);
 367
 368         route->src = src ? *src : IN_ADDR_NULL;
 369         route->src_prefixlen = src_prefixlen;
 370         route->gw = gw ? *gw : IN_ADDR_NULL;
 371         route->prefsrc = prefsrc ? *prefsrc : IN_ADDR_NULL;
 372         route->scope = scope;
 373         route->protocol = protocol;
 374         route->type = type;
 375 }
 376
 377 static int route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 378         int r;
 379
 380         assert(m);
 381         assert(link);
 382         assert(link->ifname);
 383
 384         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 385                 return 1;
 386
 387         r = sd_netlink_message_get_errno(m);
 388         if (r < 0 && r != -ESRCH)
 389                 log_link_warning_errno(link, r, "Could not drop route: %m");
 390
 391         return 1;
 392 }
 393
 394 int route_remove(Route *route, Link *link,
 395                  link_netlink_message_handler_t callback) {
 396
 397         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 398         int r;
 399
 400         assert(link);
 401         assert(link->manager);
 402         assert(link->manager->rtnl);
 403         assert(link->ifindex > 0);
 404         assert(IN_SET(route->family, AF_INET, AF_INET6));
 405
 406         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
 407                                       RTM_DELROUTE, route->family,
 408                                       route->protocol);
 409         if (r < 0)
 410                 return log_link_error_errno(link, r, "Could not create RTM_DELROUTE message: %m");
 411
 412         if (in_addr_is_null(route->family, &route->gw) == 0) {
 413                 r = netlink_message_append_in_addr_union(req, RTA_GATEWAY, route->family, &route->gw);
 414                 if (r < 0)
 415                         return log_link_error_errno(link, r, "Could not append RTA_GATEWAY attribute: %m");
 416         }
 417
 418         if (route->dst_prefixlen) {
 419                 r = netlink_message_append_in_addr_union(req, RTA_DST, route->family, &route->dst);
 420                 if (r < 0)
 421                         return log_link_error_errno(link, r, "Could not append RTA_DST attribute: %m");
 422
 423                 r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
 424                 if (r < 0)
 425                         return log_link_error_errno(link, r, "Could not set destination prefix length: %m");
 426         }
 427
 428         if (route->src_prefixlen) {
 429                 r = netlink_message_append_in_addr_union(req, RTA_SRC, route->family, &route->src);
 430                 if (r < 0)
 431                         return log_link_error_errno(link, r, "Could not append RTA_SRC attribute: %m");
 432
 433                 r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
 434                 if (r < 0)
 435                         return log_link_error_errno(link, r, "Could not set source prefix length: %m");
 436         }
 437
 438         if (in_addr_is_null(route->family, &route->prefsrc) == 0) {
 439                 r = netlink_message_append_in_addr_union(req, RTA_PREFSRC, route->family, &route->prefsrc);
 440                 if (r < 0)
 441                         return log_link_error_errno(link, r, "Could not append RTA_PREFSRC attribute: %m");
 442         }
 443
 444         r = sd_rtnl_message_route_set_scope(req, route->scope);
 445         if (r < 0)
 446                 return log_link_error_errno(link, r, "Could not set scope: %m");
 447
 448         r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
 449         if (r < 0)
 450                 return log_link_error_errno(link, r, "Could not append RTA_PRIORITY attribute: %m");
 451
 452         if (!IN_SET(route->type, RTN_UNREACHABLE, RTN_PROHIBIT, RTN_BLACKHOLE, RTN_THROW)) {
 453                 r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
 454                 if (r < 0)
 455                         return log_link_error_errno(link, r, "Could not append RTA_OIF attribute: %m");
 456         }
 457
 458         r = netlink_call_async(link->manager->rtnl, NULL, req,
 459                                callback ?: route_remove_handler,
 460                                link_netlink_destroy_callback, link);
 461         if (r < 0)
 462                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 463
 464         link_ref(link);
 465
 466         return 0;
 467 }
 468
 469 int route_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) {
 470         Route *route = userdata;
 471         int r;
 472
 473         assert(route);
 474
 475         r = route_remove(route, route->link, NULL);
 476         if (r < 0)
 477                 log_warning_errno(r, "Could not remove route: %m");
 478         else
 479                 route_free(route);
 480
 481         return 1;
 482 }
 483
 484 int route_configure(
 485                 Route *route,
 486                 Link *link,
 487                 link_netlink_message_handler_t callback) {
 488
 489         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 490         _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
 491         usec_t lifetime;
 492         int r;
 493
 494         assert(link);
 495         assert(link->manager);
 496         assert(link->manager->rtnl);
 497         assert(link->ifindex > 0);
 498         assert(IN_SET(route->family, AF_INET, AF_INET6));
 499         assert(callback);
 500
 501         if (route_get(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL) <= 0 &&
 502             set_size(link->routes) >= routes_max())
 503                 return log_link_error_errno(link, SYNTHETIC_ERRNO(E2BIG),
 504                                             "Too many routes are configured, refusing: %m");
 505
 506         if (DEBUG_LOGGING) {
 507                 _cleanup_free_ char *dst = NULL, *dst_prefixlen = NULL, *src = NULL, *gw = NULL, *prefsrc = NULL;
 508
 509                 if (!in_addr_is_null(route->family, &route->dst)) {
 510                         (void) in_addr_to_string(route->family, &route->dst, &dst);
 511                         (void) asprintf(&dst_prefixlen, "/%u", route->dst_prefixlen);
 512                 }
 513                 if (!in_addr_is_null(route->family, &route->src))
 514                         (void) in_addr_to_string(route->family, &route->src, &src);
 515                 if (!in_addr_is_null(route->family, &route->gw))
 516                         (void) in_addr_to_string(route->family, &route->gw, &gw);
 517                 if (!in_addr_is_null(route->family, &route->prefsrc))
 518                         (void) in_addr_to_string(route->family, &route->prefsrc, &prefsrc);
 519
 520                 log_link_debug(link, "Configuring route: dst: %s%s, src: %s, gw: %s, prefsrc: %s",
 521                                strna(dst), strempty(dst_prefixlen), strna(src), strna(gw), strna(prefsrc));
 522         }
 523
 524         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
 525                                       RTM_NEWROUTE, route->family,
 526                                       route->protocol);
 527         if (r < 0)
 528                 return log_link_error_errno(link, r, "Could not create RTM_NEWROUTE message: %m");
 529
 530         if (in_addr_is_null(route->family, &route->gw) == 0) {
 531                 r = netlink_message_append_in_addr_union(req, RTA_GATEWAY, route->family, &route->gw);
 532                 if (r < 0)
 533                         return log_link_error_errno(link, r, "Could not append RTA_GATEWAY attribute: %m");
 534
 535                 r = sd_rtnl_message_route_set_family(req, route->family);
 536                 if (r < 0)
 537                         return log_link_error_errno(link, r, "Could not set route family: %m");
 538         }
 539
 540         if (route->dst_prefixlen) {
 541                 r = netlink_message_append_in_addr_union(req, RTA_DST, route->family, &route->dst);
 542                 if (r < 0)
 543                         return log_link_error_errno(link, r, "Could not append RTA_DST attribute: %m");
 544
 545                 r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
 546                 if (r < 0)
 547                         return log_link_error_errno(link, r, "Could not set destination prefix length: %m");
 548         }
 549
 550         if (route->src_prefixlen) {
 551                 r = netlink_message_append_in_addr_union(req, RTA_SRC, route->family, &route->src);
 552                 if (r < 0)
 553                         return log_link_error_errno(link, r, "Could not append RTA_SRC attribute: %m");
 554
 555                 r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
 556                 if (r < 0)
 557                         return log_link_error_errno(link, r, "Could not set source prefix length: %m");
 558         }
 559
 560         if (in_addr_is_null(route->family, &route->prefsrc) == 0) {
 561                 r = netlink_message_append_in_addr_union(req, RTA_PREFSRC, route->family, &route->prefsrc);
 562                 if (r < 0)
 563                         return log_link_error_errno(link, r, "Could not append RTA_PREFSRC attribute: %m");
 564         }
 565
 566         r = sd_rtnl_message_route_set_scope(req, route->scope);
 567         if (r < 0)
 568                 return log_link_error_errno(link, r, "Could not set scope: %m");
 569
 570         if (route->gateway_onlink >= 0)
 571                 SET_FLAG(route->flags, RTNH_F_ONLINK, route->gateway_onlink);
 572
 573         r = sd_rtnl_message_route_set_flags(req, route->flags);
 574         if (r < 0)
 575                 return log_link_error_errno(link, r, "Could not set flags: %m");
 576
 577         if (route->table != RT_TABLE_MAIN) {
 578                 if (route->table < 256) {
 579                         r = sd_rtnl_message_route_set_table(req, route->table);
 580                         if (r < 0)
 581                                 return log_link_error_errno(link, r, "Could not set route table: %m");
 582                 } else {
 583                         r = sd_rtnl_message_route_set_table(req, RT_TABLE_UNSPEC);
 584                         if (r < 0)
 585                                 return log_link_error_errno(link, r, "Could not set route table: %m");
 586
 587                         /* Table attribute to allow more than 256. */
 588                         r = sd_netlink_message_append_data(req, RTA_TABLE, &route->table, sizeof(route->table));
 589                         if (r < 0)
 590                                 return log_link_error_errno(link, r, "Could not append RTA_TABLE attribute: %m");
 591                 }
 592         }
 593
 594         r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
 595         if (r < 0)
 596                 return log_link_error_errno(link, r, "Could not append RTA_PRIORITY attribute: %m");
 597
 598         r = sd_netlink_message_append_u8(req, RTA_PREF, route->pref);
 599         if (r < 0)
 600                 return log_link_error_errno(link, r, "Could not append RTA_PREF attribute: %m");
 601
 602         if (route->lifetime != USEC_INFINITY && kernel_route_expiration_supported()) {
 603                 r = sd_netlink_message_append_u32(req, RTA_EXPIRES,
 604                         DIV_ROUND_UP(usec_sub_unsigned(route->lifetime, now(clock_boottime_or_monotonic())), USEC_PER_SEC));
 605                 if (r < 0)
 606                         return log_link_error_errno(link, r, "Could not append RTA_EXPIRES attribute: %m");
 607         }
 608
 609         r = sd_rtnl_message_route_set_type(req, route->type);
 610         if (r < 0)
 611                 return log_link_error_errno(link, r, "Could not set route type: %m");
 612
 613         if (!IN_SET(route->type, RTN_UNREACHABLE, RTN_PROHIBIT, RTN_BLACKHOLE, RTN_THROW)) {
 614                 r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
 615                 if (r < 0)
 616                         return log_link_error_errno(link, r, "Could not append RTA_OIF attribute: %m");
 617         }
 618
 619         r = sd_netlink_message_open_container(req, RTA_METRICS);
 620         if (r < 0)
 621                 return log_link_error_errno(link, r, "Could not append RTA_METRICS attribute: %m");
 622
 623         if (route->mtu > 0) {
 624                 r = sd_netlink_message_append_u32(req, RTAX_MTU, route->mtu);
 625                 if (r < 0)
 626                         return log_link_error_errno(link, r, "Could not append RTAX_MTU attribute: %m");
 627         }
 628
 629         if (route->initcwnd > 0) {
 630                 r = sd_netlink_message_append_u32(req, RTAX_INITCWND, route->initcwnd);
 631                 if (r < 0)
 632                         return log_link_error_errno(link, r, "Could not append RTAX_INITCWND attribute: %m");
 633         }
 634
 635         if (route->initrwnd > 0) {
 636                 r = sd_netlink_message_append_u32(req, RTAX_INITRWND, route->initrwnd);
 637                 if (r < 0)
 638                         return log_link_error_errno(link, r, "Could not append RTAX_INITRWND attribute: %m");
 639         }
 640
 641         if (route->quickack != -1) {
 642                 r = sd_netlink_message_append_u32(req, RTAX_QUICKACK, route->quickack);
 643                 if (r < 0)
 644                         return log_link_error_errno(link, r, "Could not append RTAX_QUICKACK attribute: %m");
 645         }
 646
 647         r = sd_netlink_message_close_container(req);
 648         if (r < 0)
 649                 return log_link_error_errno(link, r, "Could not append RTA_METRICS attribute: %m");
 650
 651         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
 652                                link_netlink_destroy_callback, link);
 653         if (r < 0)
 654                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 655
 656         link_ref(link);
 657
 658         lifetime = route->lifetime;
 659
 660         r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, &route);
 661         if (r < 0)
 662                 return log_link_error_errno(link, r, "Could not add route: %m");
 663
 664         /* TODO: drop expiration handling once it can be pushed into the kernel */
 665         route->lifetime = lifetime;
 666
 667         if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
 668                 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(),
 669                                       route->lifetime, 0, route_expire_handler, route);
 670                 if (r < 0)
 671                         return log_link_error_errno(link, r, "Could not arm expiration timer: %m");
 672         }
 673
 674         sd_event_source_unref(route->expire);
 675         route->expire = TAKE_PTR(expire);
 676
 677         return 0;
 678 }
 679
 680 int network_add_ipv4ll_route(Network *network) {
 681         _cleanup_(route_freep) Route *n = NULL;
 682         int r;
 683
 684         assert(network);
 685
 686         if (!network->ipv4ll_route)
 687                 return 0;
 688
 689         /* IPv4LLRoute= is in [Network] section. */
 690         r = route_new_static(network, NULL, 0, &n);
 691         if (r < 0)
 692                 return r;
 693
 694         r = in_addr_from_string(AF_INET, "169.254.0.0", &n->dst);
 695         if (r < 0)
 696                 return r;
 697
 698         n->family = AF_INET;
 699         n->dst_prefixlen = 16;
 700         n->scope = RT_SCOPE_LINK;
 701         n->priority = IPV4LL_ROUTE_METRIC;
 702         n->protocol = RTPROT_STATIC;
 703
 704         TAKE_PTR(n);
 705         return 0;
 706 }
 707
 708 int config_parse_gateway(
 709                 const char *unit,
 710                 const char *filename,
 711                 unsigned line,
 712                 const char *section,
 713                 unsigned section_line,
 714                 const char *lvalue,
 715                 int ltype,
 716                 const char *rvalue,
 717                 void *data,
 718                 void *userdata) {
 719
 720         Network *network = userdata;
 721         _cleanup_(route_freep) Route *n = NULL;
 722         int r;
 723
 724         assert(filename);
 725         assert(section);
 726         assert(lvalue);
 727         assert(rvalue);
 728         assert(data);
 729
 730         if (streq(section, "Network")) {
 731                 /* we are not in an Route section, so treat
 732                  * this as the special '0' section */
 733                 r = route_new_static(network, NULL, 0, &n);
 734         } else
 735                 r = route_new_static(network, filename, section_line, &n);
 736         if (r < 0)
 737                 return r;
 738
 739         if (n->family == AF_UNSPEC)
 740                 r = in_addr_from_string_auto(rvalue, &n->family, &n->gw);
 741         else
 742                 r = in_addr_from_string(n->family, rvalue, &n->gw);
 743         if (r < 0) {
 744                 log_syntax(unit, LOG_ERR, filename, line, r,
 745                            "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
 746                 return 0;
 747         }
 748
 749         TAKE_PTR(n);
 750         return 0;
 751 }
 752
 753 int config_parse_preferred_src(
 754                 const char *unit,
 755                 const char *filename,
 756                 unsigned line,
 757                 const char *section,
 758                 unsigned section_line,
 759                 const char *lvalue,
 760                 int ltype,
 761                 const char *rvalue,
 762                 void *data,
 763                 void *userdata) {
 764
 765         Network *network = userdata;
 766         _cleanup_(route_freep) Route *n = NULL;
 767         int r;
 768
 769         assert(filename);
 770         assert(section);
 771         assert(lvalue);
 772         assert(rvalue);
 773         assert(data);
 774
 775         r = route_new_static(network, filename, section_line, &n);
 776         if (r < 0)
 777                 return r;
 778
 779         if (n->family == AF_UNSPEC)
 780                 r = in_addr_from_string_auto(rvalue, &n->family, &n->prefsrc);
 781         else
 782                 r = in_addr_from_string(n->family, rvalue, &n->prefsrc);
 783         if (r < 0) {
 784                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 785                            "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
 786                 return 0;
 787         }
 788
 789         TAKE_PTR(n);
 790         return 0;
 791 }
 792
 793 int config_parse_destination(
 794                 const char *unit,
 795                 const char *filename,
 796                 unsigned line,
 797                 const char *section,
 798                 unsigned section_line,
 799                 const char *lvalue,
 800                 int ltype,
 801                 const char *rvalue,
 802                 void *data,
 803                 void *userdata) {
 804
 805         Network *network = userdata;
 806         _cleanup_(route_freep) Route *n = NULL;
 807         union in_addr_union *buffer;
 808         unsigned char *prefixlen;
 809         int r;
 810
 811         assert(filename);
 812         assert(section);
 813         assert(lvalue);
 814         assert(rvalue);
 815         assert(data);
 816
 817         r = route_new_static(network, filename, section_line, &n);
 818         if (r < 0)
 819                 return r;
 820
 821         if (streq(lvalue, "Destination")) {
 822                 buffer = &n->dst;
 823                 prefixlen = &n->dst_prefixlen;
 824         } else if (streq(lvalue, "Source")) {
 825                 buffer = &n->src;
 826                 prefixlen = &n->src_prefixlen;
 827         } else
 828                 assert_not_reached(lvalue);
 829
 830         if (n->family == AF_UNSPEC)
 831                 r = in_addr_prefix_from_string_auto(rvalue, &n->family, buffer, prefixlen);
 832         else
 833                 r = in_addr_prefix_from_string(rvalue, n->family, buffer, prefixlen);
 834         if (r < 0) {
 835                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 836                            "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
 837                 return 0;
 838         }
 839
 840         TAKE_PTR(n);
 841         return 0;
 842 }
 843
 844 int config_parse_route_priority(
 845                 const char *unit,
 846                 const char *filename,
 847                 unsigned line,
 848                 const char *section,
 849                 unsigned section_line,
 850                 const char *lvalue,
 851                 int ltype,
 852                 const char *rvalue,
 853                 void *data,
 854                 void *userdata) {
 855
 856         Network *network = userdata;
 857         _cleanup_(route_freep) Route *n = NULL;
 858         int r;
 859
 860         assert(filename);
 861         assert(section);
 862         assert(lvalue);
 863         assert(rvalue);
 864         assert(data);
 865
 866         r = route_new_static(network, filename, section_line, &n);
 867         if (r < 0)
 868                 return r;
 869
 870         r = safe_atou32(rvalue, &n->priority);
 871         if (r < 0) {
 872                 log_syntax(unit, LOG_ERR, filename, line, r,
 873                            "Could not parse route priority \"%s\", ignoring assignment: %m", rvalue);
 874                 return 0;
 875         }
 876
 877         TAKE_PTR(n);
 878         return 0;
 879 }
 880
 881 int config_parse_route_scope(
 882                 const char *unit,
 883                 const char *filename,
 884                 unsigned line,
 885                 const char *section,
 886                 unsigned section_line,
 887                 const char *lvalue,
 888                 int ltype,
 889                 const char *rvalue,
 890                 void *data,
 891                 void *userdata) {
 892
 893         Network *network = userdata;
 894         _cleanup_(route_freep) Route *n = NULL;
 895         int r;
 896
 897         assert(filename);
 898         assert(section);
 899         assert(lvalue);
 900         assert(rvalue);
 901         assert(data);
 902
 903         r = route_new_static(network, filename, section_line, &n);
 904         if (r < 0)
 905                 return r;
 906
 907         if (streq(rvalue, "host"))
 908                 n->scope = RT_SCOPE_HOST;
 909         else if (streq(rvalue, "link"))
 910                 n->scope = RT_SCOPE_LINK;
 911         else if (streq(rvalue, "global"))
 912                 n->scope = RT_SCOPE_UNIVERSE;
 913         else {
 914                 log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route scope: %s", rvalue);
 915                 return 0;
 916         }
 917
 918         TAKE_PTR(n);
 919         return 0;
 920 }
 921
 922 int config_parse_route_table(
 923                 const char *unit,
 924                 const char *filename,
 925                 unsigned line,
 926                 const char *section,
 927                 unsigned section_line,
 928                 const char *lvalue,
 929                 int ltype,
 930                 const char *rvalue,
 931                 void *data,
 932                 void *userdata) {
 933
 934         _cleanup_(route_freep) Route *n = NULL;
 935         Network *network = userdata;
 936         int r;
 937
 938         assert(filename);
 939         assert(section);
 940         assert(lvalue);
 941         assert(rvalue);
 942         assert(data);
 943
 944         r = route_new_static(network, filename, section_line, &n);
 945         if (r < 0)
 946                 return r;
 947
 948         r = safe_atou32(rvalue, &n->table);
 949         if (r < 0) {
 950                 log_syntax(unit, LOG_ERR, filename, line, r,
 951                            "Could not parse route table number \"%s\", ignoring assignment: %m", rvalue);
 952                 return 0;
 953         }
 954
 955         TAKE_PTR(n);
 956         return 0;
 957 }
 958
 959 int config_parse_gateway_onlink(
 960                 const char *unit,
 961                 const char *filename,
 962                 unsigned line,
 963                 const char *section,
 964                 unsigned section_line,
 965                 const char *lvalue,
 966                 int ltype,
 967                 const char *rvalue,
 968                 void *data,
 969                 void *userdata) {
 970
 971         Network *network = userdata;
 972         _cleanup_(route_freep) Route *n = NULL;
 973         int r;
 974
 975         assert(filename);
 976         assert(section);
 977         assert(lvalue);
 978         assert(rvalue);
 979         assert(data);
 980
 981         r = route_new_static(network, filename, section_line, &n);
 982         if (r < 0)
 983                 return r;
 984
 985         r = parse_boolean(rvalue);
 986         if (r < 0) {
 987                 log_syntax(unit, LOG_ERR, filename, line, r,
 988                            "Could not parse %s=\"%s\", ignoring assignment: %m", lvalue, rvalue);
 989                 return 0;
 990         }
 991
 992         n->gateway_onlink = r;
 993
 994         TAKE_PTR(n);
 995         return 0;
 996 }
 997
 998 int config_parse_ipv6_route_preference(
 999                 const char *unit,
1000                 const char *filename,
1001                 unsigned line,
1002                 const char *section,
1003                 unsigned section_line,
1004                 const char *lvalue,
1005                 int ltype,
1006                 const char *rvalue,
1007                 void *data,
1008                 void *userdata) {
1009
1010         Network *network = userdata;
1011         _cleanup_(route_freep) Route *n = NULL;
1012         int r;
1013
1014         r = route_new_static(network, filename, section_line, &n);
1015         if (r < 0)
1016                 return r;
1017
1018         if (streq(rvalue, "low"))
1019                 n->pref = ICMPV6_ROUTER_PREF_LOW;
1020         else if (streq(rvalue, "medium"))
1021                 n->pref = ICMPV6_ROUTER_PREF_MEDIUM;
1022         else if (streq(rvalue, "high"))
1023                 n->pref = ICMPV6_ROUTER_PREF_HIGH;
1024         else {
1025                 log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route preference: %s", rvalue);
1026                 return 0;
1027         }
1028
1029         TAKE_PTR(n);
1030         return 0;
1031 }
1032
1033 int config_parse_route_protocol(
1034                 const char *unit,
1035                 const char *filename,
1036                 unsigned line,
1037                 const char *section,
1038                 unsigned section_line,
1039                 const char *lvalue,
1040                 int ltype,
1041                 const char *rvalue,
1042                 void *data,
1043                 void *userdata) {
1044
1045         Network *network = userdata;
1046         _cleanup_(route_freep) Route *n = NULL;
1047         int r;
1048
1049         r = route_new_static(network, filename, section_line, &n);
1050         if (r < 0)
1051                 return r;
1052
1053         if (streq(rvalue, "kernel"))
1054                 n->protocol = RTPROT_KERNEL;
1055         else if (streq(rvalue, "boot"))
1056                 n->protocol = RTPROT_BOOT;
1057         else if (streq(rvalue, "static"))
1058                 n->protocol = RTPROT_STATIC;
1059         else {
1060                 r = safe_atou8(rvalue , &n->protocol);
1061                 if (r < 0) {
1062                         log_syntax(unit, LOG_ERR, filename, line, r,
1063                                    "Could not parse route protocol \"%s\", ignoring assignment: %m", rvalue);
1064                         return 0;
1065                 }
1066         }
1067
1068         TAKE_PTR(n);
1069         return 0;
1070 }
1071
1072 int config_parse_route_type(
1073                 const char *unit,
1074                 const char *filename,
1075                 unsigned line,
1076                 const char *section,
1077                 unsigned section_line,
1078                 const char *lvalue,
1079                 int ltype,
1080                 const char *rvalue,
1081                 void *data,
1082                 void *userdata) {
1083
1084         Network *network = userdata;
1085         _cleanup_(route_freep) Route *n = NULL;
1086         int r;
1087
1088         r = route_new_static(network, filename, section_line, &n);
1089         if (r < 0)
1090                 return r;
1091
1092         if (streq(rvalue, "unicast"))
1093                 n->type = RTN_UNICAST;
1094         else if (streq(rvalue, "blackhole"))
1095                 n->type = RTN_BLACKHOLE;
1096         else if (streq(rvalue, "unreachable"))
1097                 n->type = RTN_UNREACHABLE;
1098         else if (streq(rvalue, "prohibit"))
1099                 n->type = RTN_PROHIBIT;
1100         else if (streq(rvalue, "throw"))
1101                 n->type = RTN_THROW;
1102         else {
1103                 log_syntax(unit, LOG_ERR, filename, line, r,
1104                            "Could not parse route type \"%s\", ignoring assignment: %m", rvalue);
1105                 return 0;
1106         }
1107
1108         TAKE_PTR(n);
1109         return 0;
1110 }
1111
1112 int config_parse_tcp_window(
1113                 const char *unit,
1114                 const char *filename,
1115                 unsigned line,
1116                 const char *section,
1117                 unsigned section_line,
1118                 const char *lvalue,
1119                 int ltype,
1120                 const char *rvalue,
1121                 void *data,
1122                 void *userdata) {
1123
1124         _cleanup_(route_freep) Route *n = NULL;
1125         Network *network = userdata;
1126         uint64_t k;
1127         int r;
1128
1129         assert(filename);
1130         assert(section);
1131         assert(lvalue);
1132         assert(rvalue);
1133         assert(data);
1134
1135         r = route_new_static(network, filename, section_line, &n);
1136         if (r < 0)
1137                 return r;
1138
1139         r = parse_size(rvalue, 1024, &k);
1140         if (r < 0) {
1141                 log_syntax(unit, LOG_ERR, filename, line, r,
1142                            "Could not parse TCP %s \"%s\", ignoring assignment: %m", lvalue, rvalue);
1143                 return 0;
1144         }
1145         if (k > UINT32_MAX) {
1146                 log_syntax(unit, LOG_ERR, filename, line, 0,
1147                            "Specified TCP %s \"%s\" is too large, ignoring assignment: %m", lvalue, rvalue);
1148                 return 0;
1149         }
1150
1151         if (streq(lvalue, "InitialCongestionWindow"))
1152                 n->initcwnd = k;
1153         else if (streq(lvalue, "InitialAdvertisedReceiveWindow"))
1154                 n->initrwnd = k;
1155         else
1156                 assert_not_reached("Invalid TCP window type.");
1157
1158         TAKE_PTR(n);
1159         return 0;
1160 }
1161
1162 int config_parse_quickack(
1163                 const char *unit,
1164                 const char *filename,
1165                 unsigned line,
1166                 const char *section,
1167                 unsigned section_line,
1168                 const char *lvalue,
1169                 int ltype,
1170                 const char *rvalue,
1171                 void *data,
1172                 void *userdata) {
1173
1174         _cleanup_(route_freep) Route *n = NULL;
1175         Network *network = userdata;
1176         int k, r;
1177
1178         assert(filename);
1179         assert(section);
1180         assert(lvalue);
1181         assert(rvalue);
1182         assert(data);
1183
1184         r = route_new_static(network, filename, section_line, &n);
1185         if (r < 0)
1186                 return r;
1187
1188         k = parse_boolean(rvalue);
1189         if (k < 0) {
1190                 log_syntax(unit, LOG_ERR, filename, line, k,
1191                            "Failed to parse TCP quickack, ignoring: %s", rvalue);
1192                 return 0;
1193         }
1194
1195         n->quickack = !!k;
1196         TAKE_PTR(n);
1197         return 0;
1198 }
1199
1200 int config_parse_route_mtu(
1201                 const char *unit,
1202                 const char *filename,
1203                 unsigned line,
1204                 const char *section,
1205                 unsigned section_line,
1206                 const char *lvalue,
1207                 int ltype,
1208                 const char *rvalue,
1209                 void *data,
1210                 void *userdata) {
1211
1212         Network *network = userdata;
1213         _cleanup_(route_freep) Route *n = NULL;
1214         int r;
1215
1216         assert(filename);
1217         assert(section);
1218         assert(lvalue);
1219         assert(rvalue);
1220         assert(data);
1221
1222         r = route_new_static(network, filename, section_line, &n);
1223         if (r < 0)
1224                 return r;
1225
1226         r = config_parse_mtu(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &n->mtu, userdata);
1227         if (r < 0)
1228                 return r;
1229
1230         TAKE_PTR(n);
1231         return 0;
1232 }