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                 .fast_open_no_cookie = -1,
  63                 .gateway_onlink = -1,
  64                 .ttl_propagate = -1,
  65         };
  66
  67         *ret = TAKE_PTR(route);
  68
  69         return 0;
  70 }
  71
  72 static int route_new_static(Network *network, const char *filename, unsigned section_line, Route **ret) {
  73         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  74         _cleanup_(route_freep) Route *route = NULL;
  75         int r;
  76
  77         assert(network);
  78         assert(ret);
  79         assert(!!filename == (section_line > 0));
  80
  81         if (filename) {
  82                 r = network_config_section_new(filename, section_line, &n);
  83                 if (r < 0)
  84                         return r;
  85
  86                 route = hashmap_get(network->routes_by_section, n);
  87                 if (route) {
  88                         *ret = TAKE_PTR(route);
  89
  90                         return 0;
  91                 }
  92         }
  93
  94         if (network->n_static_routes >= routes_max())
  95                 return -E2BIG;
  96
  97         r = route_new(&route);
  98         if (r < 0)
  99                 return r;
 100
 101         route->protocol = RTPROT_STATIC;
 102         route->network = network;
 103         LIST_PREPEND(routes, network->static_routes, route);
 104         network->n_static_routes++;
 105
 106         if (filename) {
 107                 route->section = TAKE_PTR(n);
 108
 109                 r = hashmap_ensure_allocated(&network->routes_by_section, &network_config_hash_ops);
 110                 if (r < 0)
 111                         return r;
 112
 113                 r = hashmap_put(network->routes_by_section, route->section, route);
 114                 if (r < 0)
 115                         return r;
 116         }
 117
 118         *ret = TAKE_PTR(route);
 119
 120         return 0;
 121 }
 122
 123 void route_free(Route *route) {
 124         if (!route)
 125                 return;
 126
 127         if (route->network) {
 128                 LIST_REMOVE(routes, route->network->static_routes, route);
 129
 130                 assert(route->network->n_static_routes > 0);
 131                 route->network->n_static_routes--;
 132
 133                 if (route->section)
 134                         hashmap_remove(route->network->routes_by_section, route->section);
 135         }
 136
 137         network_config_section_free(route->section);
 138
 139         if (route->link) {
 140                 set_remove(route->link->routes, route);
 141                 set_remove(route->link->routes_foreign, route);
 142         }
 143
 144         sd_event_source_unref(route->expire);
 145
 146         free(route);
 147 }
 148
 149 static void route_hash_func(const Route *route, struct siphash *state) {
 150         assert(route);
 151
 152         siphash24_compress(&route->family, sizeof(route->family), state);
 153
 154         switch (route->family) {
 155         case AF_INET:
 156         case AF_INET6:
 157                 /* Equality of routes are given by the 4-touple
 158                    (dst_prefix,dst_prefixlen,tos,priority,table) */
 159                 siphash24_compress(&route->dst, FAMILY_ADDRESS_SIZE(route->family), state);
 160                 siphash24_compress(&route->dst_prefixlen, sizeof(route->dst_prefixlen), state);
 161                 siphash24_compress(&route->tos, sizeof(route->tos), state);
 162                 siphash24_compress(&route->priority, sizeof(route->priority), state);
 163                 siphash24_compress(&route->table, sizeof(route->table), state);
 164
 165                 break;
 166         default:
 167                 /* treat any other address family as AF_UNSPEC */
 168                 break;
 169         }
 170 }
 171
 172 static int route_compare_func(const Route *a, const Route *b) {
 173         int r;
 174
 175         r = CMP(a->family, b->family);
 176         if (r != 0)
 177                 return r;
 178
 179         switch (a->family) {
 180         case AF_INET:
 181         case AF_INET6:
 182                 r = CMP(a->dst_prefixlen, b->dst_prefixlen);
 183                 if (r != 0)
 184                         return r;
 185
 186                 r = CMP(a->tos, b->tos);
 187                 if (r != 0)
 188                         return r;
 189
 190                 r = CMP(a->priority, b->priority);
 191                 if (r != 0)
 192                         return r;
 193
 194                 r = CMP(a->table, b->table);
 195                 if (r != 0)
 196                         return r;
 197
 198                 return memcmp(&a->dst, &b->dst, FAMILY_ADDRESS_SIZE(a->family));
 199         default:
 200                 /* treat any other address family as AF_UNSPEC */
 201                 return 0;
 202         }
 203 }
 204
 205 DEFINE_PRIVATE_HASH_OPS(route_hash_ops, Route, route_hash_func, route_compare_func);
 206
 207 bool route_equal(Route *r1, Route *r2) {
 208         if (r1 == r2)
 209                 return true;
 210
 211         if (!r1 || !r2)
 212                 return false;
 213
 214         return route_compare_func(r1, r2) == 0;
 215 }
 216
 217 int route_get(Link *link,
 218               int family,
 219               const union in_addr_union *dst,
 220               unsigned char dst_prefixlen,
 221               unsigned char tos,
 222               uint32_t priority,
 223               uint32_t table,
 224               Route **ret) {
 225
 226         Route route, *existing;
 227
 228         assert(link);
 229         assert(dst);
 230
 231         route = (Route) {
 232                 .family = family,
 233                 .dst = *dst,
 234                 .dst_prefixlen = dst_prefixlen,
 235                 .tos = tos,
 236                 .priority = priority,
 237                 .table = table,
 238         };
 239
 240         existing = set_get(link->routes, &route);
 241         if (existing) {
 242                 if (ret)
 243                         *ret = existing;
 244                 return 1;
 245         }
 246
 247         existing = set_get(link->routes_foreign, &route);
 248         if (existing) {
 249                 if (ret)
 250                         *ret = existing;
 251                 return 0;
 252         }
 253
 254         return -ENOENT;
 255 }
 256
 257 static int route_add_internal(
 258                 Link *link,
 259                 Set **routes,
 260                 int family,
 261                 const union in_addr_union *dst,
 262                 unsigned char dst_prefixlen,
 263                 unsigned char tos,
 264                 uint32_t priority,
 265                 uint32_t table,
 266                 Route **ret) {
 267
 268         _cleanup_(route_freep) Route *route = NULL;
 269         int r;
 270
 271         assert(link);
 272         assert(routes);
 273         assert(dst);
 274
 275         r = route_new(&route);
 276         if (r < 0)
 277                 return r;
 278
 279         route->family = family;
 280         route->dst = *dst;
 281         route->dst_prefixlen = dst_prefixlen;
 282         route->tos = tos;
 283         route->priority = priority;
 284         route->table = table;
 285
 286         r = set_ensure_allocated(routes, &route_hash_ops);
 287         if (r < 0)
 288                 return r;
 289
 290         r = set_put(*routes, route);
 291         if (r < 0)
 292                 return r;
 293
 294         route->link = link;
 295
 296         if (ret)
 297                 *ret = route;
 298
 299         route = NULL;
 300
 301         return 0;
 302 }
 303
 304 int route_add_foreign(
 305                 Link *link,
 306                 int family,
 307                 const union in_addr_union *dst,
 308                 unsigned char dst_prefixlen,
 309                 unsigned char tos,
 310                 uint32_t priority,
 311                 uint32_t table,
 312                 Route **ret) {
 313
 314         return route_add_internal(link, &link->routes_foreign, family, dst, dst_prefixlen, tos, priority, table, ret);
 315 }
 316
 317 int route_add(Link *link,
 318               int family,
 319               const union in_addr_union *dst,
 320               unsigned char dst_prefixlen,
 321               unsigned char tos,
 322               uint32_t priority,
 323               uint32_t table,
 324               Route **ret) {
 325
 326         Route *route;
 327         int r;
 328
 329         r = route_get(link, family, dst, dst_prefixlen, tos, priority, table, &route);
 330         if (r == -ENOENT) {
 331                 /* Route does not exist, create a new one */
 332                 r = route_add_internal(link, &link->routes, family, dst, dst_prefixlen, tos, priority, table, &route);
 333                 if (r < 0)
 334                         return r;
 335         } else if (r == 0) {
 336                 /* Take over a foreign route */
 337                 r = set_ensure_allocated(&link->routes, &route_hash_ops);
 338                 if (r < 0)
 339                         return r;
 340
 341                 r = set_put(link->routes, route);
 342                 if (r < 0)
 343                         return r;
 344
 345                 set_remove(link->routes_foreign, route);
 346         } else if (r == 1) {
 347                 /* Route exists, do nothing */
 348                 ;
 349         } else
 350                 return r;
 351
 352         if (ret)
 353                 *ret = route;
 354
 355         return 0;
 356 }
 357
 358 void route_update(Route *route,
 359                   const union in_addr_union *src,
 360                   unsigned char src_prefixlen,
 361                   const union in_addr_union *gw,
 362                   const union in_addr_union *prefsrc,
 363                   unsigned char scope,
 364                   unsigned char protocol,
 365                   unsigned char type) {
 366
 367         assert(route);
 368         assert(src || src_prefixlen == 0);
 369
 370         route->src = src ? *src : IN_ADDR_NULL;
 371         route->src_prefixlen = src_prefixlen;
 372         route->gw = gw ? *gw : IN_ADDR_NULL;
 373         route->prefsrc = prefsrc ? *prefsrc : IN_ADDR_NULL;
 374         route->scope = scope;
 375         route->protocol = protocol;
 376         route->type = type;
 377 }
 378
 379 static int route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 380         int r;
 381
 382         assert(m);
 383         assert(link);
 384         assert(link->ifname);
 385
 386         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 387                 return 1;
 388
 389         r = sd_netlink_message_get_errno(m);
 390         if (r < 0 && r != -ESRCH)
 391                 log_link_warning_errno(link, r, "Could not drop route: %m");
 392
 393         return 1;
 394 }
 395
 396 int route_remove(Route *route, Link *link,
 397                  link_netlink_message_handler_t callback) {
 398
 399         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 400         int r;
 401
 402         assert(link);
 403         assert(link->manager);
 404         assert(link->manager->rtnl);
 405         assert(link->ifindex > 0);
 406         assert(IN_SET(route->family, AF_INET, AF_INET6));
 407
 408         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
 409                                       RTM_DELROUTE, route->family,
 410                                       route->protocol);
 411         if (r < 0)
 412                 return log_link_error_errno(link, r, "Could not create RTM_DELROUTE message: %m");
 413
 414         if (in_addr_is_null(route->family, &route->gw) == 0) {
 415                 r = netlink_message_append_in_addr_union(req, RTA_GATEWAY, route->family, &route->gw);
 416                 if (r < 0)
 417                         return log_link_error_errno(link, r, "Could not append RTA_GATEWAY attribute: %m");
 418         }
 419
 420         if (route->dst_prefixlen) {
 421                 r = netlink_message_append_in_addr_union(req, RTA_DST, route->family, &route->dst);
 422                 if (r < 0)
 423                         return log_link_error_errno(link, r, "Could not append RTA_DST attribute: %m");
 424
 425                 r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
 426                 if (r < 0)
 427                         return log_link_error_errno(link, r, "Could not set destination prefix length: %m");
 428         }
 429
 430         if (route->src_prefixlen) {
 431                 r = netlink_message_append_in_addr_union(req, RTA_SRC, route->family, &route->src);
 432                 if (r < 0)
 433                         return log_link_error_errno(link, r, "Could not append RTA_SRC attribute: %m");
 434
 435                 r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
 436                 if (r < 0)
 437                         return log_link_error_errno(link, r, "Could not set source prefix length: %m");
 438         }
 439
 440         if (in_addr_is_null(route->family, &route->prefsrc) == 0) {
 441                 r = netlink_message_append_in_addr_union(req, RTA_PREFSRC, route->family, &route->prefsrc);
 442                 if (r < 0)
 443                         return log_link_error_errno(link, r, "Could not append RTA_PREFSRC attribute: %m");
 444         }
 445
 446         r = sd_rtnl_message_route_set_scope(req, route->scope);
 447         if (r < 0)
 448                 return log_link_error_errno(link, r, "Could not set scope: %m");
 449
 450         r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
 451         if (r < 0)
 452                 return log_link_error_errno(link, r, "Could not append RTA_PRIORITY attribute: %m");
 453
 454         if (!IN_SET(route->type, RTN_UNREACHABLE, RTN_PROHIBIT, RTN_BLACKHOLE, RTN_THROW)) {
 455                 r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
 456                 if (r < 0)
 457                         return log_link_error_errno(link, r, "Could not append RTA_OIF attribute: %m");
 458         }
 459
 460         r = netlink_call_async(link->manager->rtnl, NULL, req,
 461                                callback ?: route_remove_handler,
 462                                link_netlink_destroy_callback, link);
 463         if (r < 0)
 464                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 465
 466         link_ref(link);
 467
 468         return 0;
 469 }
 470
 471 int route_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) {
 472         Route *route = userdata;
 473         int r;
 474
 475         assert(route);
 476
 477         r = route_remove(route, route->link, NULL);
 478         if (r < 0)
 479                 log_warning_errno(r, "Could not remove route: %m");
 480         else
 481                 route_free(route);
 482
 483         return 1;
 484 }
 485
 486 int route_configure(
 487                 Route *route,
 488                 Link *link,
 489                 link_netlink_message_handler_t callback) {
 490
 491         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 492         _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
 493         usec_t lifetime;
 494         int r;
 495
 496         assert(link);
 497         assert(link->manager);
 498         assert(link->manager->rtnl);
 499         assert(link->ifindex > 0);
 500         assert(IN_SET(route->family, AF_INET, AF_INET6));
 501         assert(callback);
 502
 503         if (route_get(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL) <= 0 &&
 504             set_size(link->routes) >= routes_max())
 505                 return log_link_error_errno(link, SYNTHETIC_ERRNO(E2BIG),
 506                                             "Too many routes are configured, refusing: %m");
 507
 508         if (DEBUG_LOGGING) {
 509                 _cleanup_free_ char *dst = NULL, *dst_prefixlen = NULL, *src = NULL, *gw = NULL, *prefsrc = NULL;
 510
 511                 if (!in_addr_is_null(route->family, &route->dst)) {
 512                         (void) in_addr_to_string(route->family, &route->dst, &dst);
 513                         (void) asprintf(&dst_prefixlen, "/%u", route->dst_prefixlen);
 514                 }
 515                 if (!in_addr_is_null(route->family, &route->src))
 516                         (void) in_addr_to_string(route->family, &route->src, &src);
 517                 if (!in_addr_is_null(route->family, &route->gw))
 518                         (void) in_addr_to_string(route->family, &route->gw, &gw);
 519                 if (!in_addr_is_null(route->family, &route->prefsrc))
 520                         (void) in_addr_to_string(route->family, &route->prefsrc, &prefsrc);
 521
 522                 log_link_debug(link, "Configuring route: dst: %s%s, src: %s, gw: %s, prefsrc: %s",
 523                                strna(dst), strempty(dst_prefixlen), strna(src), strna(gw), strna(prefsrc));
 524         }
 525
 526         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
 527                                       RTM_NEWROUTE, route->family,
 528                                       route->protocol);
 529         if (r < 0)
 530                 return log_link_error_errno(link, r, "Could not create RTM_NEWROUTE message: %m");
 531
 532         if (in_addr_is_null(route->family, &route->gw) == 0) {
 533                 r = netlink_message_append_in_addr_union(req, RTA_GATEWAY, route->family, &route->gw);
 534                 if (r < 0)
 535                         return log_link_error_errno(link, r, "Could not append RTA_GATEWAY attribute: %m");
 536
 537                 r = sd_rtnl_message_route_set_family(req, route->family);
 538                 if (r < 0)
 539                         return log_link_error_errno(link, r, "Could not set route family: %m");
 540         }
 541
 542         if (route->dst_prefixlen) {
 543                 r = netlink_message_append_in_addr_union(req, RTA_DST, route->family, &route->dst);
 544                 if (r < 0)
 545                         return log_link_error_errno(link, r, "Could not append RTA_DST attribute: %m");
 546
 547                 r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
 548                 if (r < 0)
 549                         return log_link_error_errno(link, r, "Could not set destination prefix length: %m");
 550         }
 551
 552         if (route->src_prefixlen) {
 553                 r = netlink_message_append_in_addr_union(req, RTA_SRC, route->family, &route->src);
 554                 if (r < 0)
 555                         return log_link_error_errno(link, r, "Could not append RTA_SRC attribute: %m");
 556
 557                 r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
 558                 if (r < 0)
 559                         return log_link_error_errno(link, r, "Could not set source prefix length: %m");
 560         }
 561
 562         if (in_addr_is_null(route->family, &route->prefsrc) == 0) {
 563                 r = netlink_message_append_in_addr_union(req, RTA_PREFSRC, route->family, &route->prefsrc);
 564                 if (r < 0)
 565                         return log_link_error_errno(link, r, "Could not append RTA_PREFSRC attribute: %m");
 566         }
 567
 568         r = sd_rtnl_message_route_set_scope(req, route->scope);
 569         if (r < 0)
 570                 return log_link_error_errno(link, r, "Could not set scope: %m");
 571
 572         if (route->gateway_onlink >= 0)
 573                 SET_FLAG(route->flags, RTNH_F_ONLINK, route->gateway_onlink);
 574
 575         r = sd_rtnl_message_route_set_flags(req, route->flags);
 576         if (r < 0)
 577                 return log_link_error_errno(link, r, "Could not set flags: %m");
 578
 579         if (route->table != RT_TABLE_MAIN) {
 580                 if (route->table < 256) {
 581                         r = sd_rtnl_message_route_set_table(req, route->table);
 582                         if (r < 0)
 583                                 return log_link_error_errno(link, r, "Could not set route table: %m");
 584                 } else {
 585                         r = sd_rtnl_message_route_set_table(req, RT_TABLE_UNSPEC);
 586                         if (r < 0)
 587                                 return log_link_error_errno(link, r, "Could not set route table: %m");
 588
 589                         /* Table attribute to allow more than 256. */
 590                         r = sd_netlink_message_append_data(req, RTA_TABLE, &route->table, sizeof(route->table));
 591                         if (r < 0)
 592                                 return log_link_error_errno(link, r, "Could not append RTA_TABLE attribute: %m");
 593                 }
 594         }
 595
 596         r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
 597         if (r < 0)
 598                 return log_link_error_errno(link, r, "Could not append RTA_PRIORITY attribute: %m");
 599
 600         r = sd_netlink_message_append_u8(req, RTA_PREF, route->pref);
 601         if (r < 0)
 602                 return log_link_error_errno(link, r, "Could not append RTA_PREF attribute: %m");
 603
 604         if (route->lifetime != USEC_INFINITY && kernel_route_expiration_supported()) {
 605                 r = sd_netlink_message_append_u32(req, RTA_EXPIRES,
 606                         DIV_ROUND_UP(usec_sub_unsigned(route->lifetime, now(clock_boottime_or_monotonic())), USEC_PER_SEC));
 607                 if (r < 0)
 608                         return log_link_error_errno(link, r, "Could not append RTA_EXPIRES attribute: %m");
 609         }
 610
 611         r = sd_rtnl_message_route_set_type(req, route->type);
 612         if (r < 0)
 613                 return log_link_error_errno(link, r, "Could not set route type: %m");
 614
 615         if (!IN_SET(route->type, RTN_UNREACHABLE, RTN_PROHIBIT, RTN_BLACKHOLE, RTN_THROW)) {
 616                 r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
 617                 if (r < 0)
 618                         return log_link_error_errno(link, r, "Could not append RTA_OIF attribute: %m");
 619         }
 620
 621         if (route->ttl_propagate >= 0) {
 622                 r = sd_netlink_message_append_u8(req, RTA_TTL_PROPAGATE, route->ttl_propagate);
 623                 if (r < 0)
 624                         return log_link_error_errno(link, r, "Could not append RTA_TTL_PROPAGATE attribute: %m");
 625         }
 626
 627         r = sd_netlink_message_open_container(req, RTA_METRICS);
 628         if (r < 0)
 629                 return log_link_error_errno(link, r, "Could not append RTA_METRICS attribute: %m");
 630
 631         if (route->mtu > 0) {
 632                 r = sd_netlink_message_append_u32(req, RTAX_MTU, route->mtu);
 633                 if (r < 0)
 634                         return log_link_error_errno(link, r, "Could not append RTAX_MTU attribute: %m");
 635         }
 636
 637         if (route->initcwnd > 0) {
 638                 r = sd_netlink_message_append_u32(req, RTAX_INITCWND, route->initcwnd);
 639                 if (r < 0)
 640                         return log_link_error_errno(link, r, "Could not append RTAX_INITCWND attribute: %m");
 641         }
 642
 643         if (route->initrwnd > 0) {
 644                 r = sd_netlink_message_append_u32(req, RTAX_INITRWND, route->initrwnd);
 645                 if (r < 0)
 646                         return log_link_error_errno(link, r, "Could not append RTAX_INITRWND attribute: %m");
 647         }
 648
 649         if (route->quickack >= 0) {
 650                 r = sd_netlink_message_append_u32(req, RTAX_QUICKACK, route->quickack);
 651                 if (r < 0)
 652                         return log_link_error_errno(link, r, "Could not append RTAX_QUICKACK attribute: %m");
 653         }
 654
 655         if (route->fast_open_no_cookie >= 0) {
 656                 r = sd_netlink_message_append_u32(req, RTAX_FASTOPEN_NO_COOKIE, route->fast_open_no_cookie);
 657                 if (r < 0)
 658                         return log_link_error_errno(link, r, "Could not append RTAX_FASTOPEN_NO_COOKIE attribute: %m");
 659         }
 660
 661         r = sd_netlink_message_close_container(req);
 662         if (r < 0)
 663                 return log_link_error_errno(link, r, "Could not append RTA_METRICS attribute: %m");
 664
 665         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
 666                                link_netlink_destroy_callback, link);
 667         if (r < 0)
 668                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 669
 670         link_ref(link);
 671
 672         lifetime = route->lifetime;
 673
 674         r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, &route);
 675         if (r < 0)
 676                 return log_link_error_errno(link, r, "Could not add route: %m");
 677
 678         /* TODO: drop expiration handling once it can be pushed into the kernel */
 679         route->lifetime = lifetime;
 680
 681         if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
 682                 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(),
 683                                       route->lifetime, 0, route_expire_handler, route);
 684                 if (r < 0)
 685                         return log_link_error_errno(link, r, "Could not arm expiration timer: %m");
 686         }
 687
 688         sd_event_source_unref(route->expire);
 689         route->expire = TAKE_PTR(expire);
 690
 691         return 0;
 692 }
 693
 694 int network_add_ipv4ll_route(Network *network) {
 695         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
 696         int r;
 697
 698         assert(network);
 699
 700         if (!network->ipv4ll_route)
 701                 return 0;
 702
 703         /* IPv4LLRoute= is in [Network] section. */
 704         r = route_new_static(network, NULL, 0, &n);
 705         if (r < 0)
 706                 return r;
 707
 708         r = in_addr_from_string(AF_INET, "169.254.0.0", &n->dst);
 709         if (r < 0)
 710                 return r;
 711
 712         n->family = AF_INET;
 713         n->dst_prefixlen = 16;
 714         n->scope = RT_SCOPE_LINK;
 715         n->priority = IPV4LL_ROUTE_METRIC;
 716         n->protocol = RTPROT_STATIC;
 717
 718         TAKE_PTR(n);
 719         return 0;
 720 }
 721
 722 int network_add_default_route_on_device(Network *network) {
 723         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
 724         int r;
 725
 726         assert(network);
 727
 728         if (!network->default_route_on_device)
 729                 return 0;
 730
 731         /* DefaultRouteOnDevice= is in [Network] section. */
 732         r = route_new_static(network, NULL, 0, &n);
 733         if (r < 0)
 734                 return r;
 735
 736         r = in_addr_from_string(AF_INET, "169.254.0.0", &n->dst);
 737         if (r < 0)
 738                 return r;
 739
 740         n->family = AF_INET;
 741
 742         TAKE_PTR(n);
 743         return 0;
 744 }
 745
 746 int config_parse_gateway(
 747                 const char *unit,
 748                 const char *filename,
 749                 unsigned line,
 750                 const char *section,
 751                 unsigned section_line,
 752                 const char *lvalue,
 753                 int ltype,
 754                 const char *rvalue,
 755                 void *data,
 756                 void *userdata) {
 757
 758         Network *network = userdata;
 759         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
 760         int r;
 761
 762         assert(filename);
 763         assert(section);
 764         assert(lvalue);
 765         assert(rvalue);
 766         assert(data);
 767
 768         if (streq(section, "Network")) {
 769                 /* we are not in an Route section, so treat
 770                  * this as the special '0' section */
 771                 r = route_new_static(network, NULL, 0, &n);
 772         } else
 773                 r = route_new_static(network, filename, section_line, &n);
 774         if (r < 0)
 775                 return r;
 776
 777         if (n->family == AF_UNSPEC)
 778                 r = in_addr_from_string_auto(rvalue, &n->family, &n->gw);
 779         else
 780                 r = in_addr_from_string(n->family, rvalue, &n->gw);
 781         if (r < 0) {
 782                 log_syntax(unit, LOG_ERR, filename, line, r,
 783                            "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
 784                 return 0;
 785         }
 786
 787         TAKE_PTR(n);
 788         return 0;
 789 }
 790
 791 int config_parse_preferred_src(
 792                 const char *unit,
 793                 const char *filename,
 794                 unsigned line,
 795                 const char *section,
 796                 unsigned section_line,
 797                 const char *lvalue,
 798                 int ltype,
 799                 const char *rvalue,
 800                 void *data,
 801                 void *userdata) {
 802
 803         Network *network = userdata;
 804         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
 805         int r;
 806
 807         assert(filename);
 808         assert(section);
 809         assert(lvalue);
 810         assert(rvalue);
 811         assert(data);
 812
 813         r = route_new_static(network, filename, section_line, &n);
 814         if (r < 0)
 815                 return r;
 816
 817         if (n->family == AF_UNSPEC)
 818                 r = in_addr_from_string_auto(rvalue, &n->family, &n->prefsrc);
 819         else
 820                 r = in_addr_from_string(n->family, rvalue, &n->prefsrc);
 821         if (r < 0) {
 822                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 823                            "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
 824                 return 0;
 825         }
 826
 827         TAKE_PTR(n);
 828         return 0;
 829 }
 830
 831 int config_parse_destination(
 832                 const char *unit,
 833                 const char *filename,
 834                 unsigned line,
 835                 const char *section,
 836                 unsigned section_line,
 837                 const char *lvalue,
 838                 int ltype,
 839                 const char *rvalue,
 840                 void *data,
 841                 void *userdata) {
 842
 843         Network *network = userdata;
 844         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
 845         union in_addr_union *buffer;
 846         unsigned char *prefixlen;
 847         int r;
 848
 849         assert(filename);
 850         assert(section);
 851         assert(lvalue);
 852         assert(rvalue);
 853         assert(data);
 854
 855         r = route_new_static(network, filename, section_line, &n);
 856         if (r < 0)
 857                 return r;
 858
 859         if (streq(lvalue, "Destination")) {
 860                 buffer = &n->dst;
 861                 prefixlen = &n->dst_prefixlen;
 862         } else if (streq(lvalue, "Source")) {
 863                 buffer = &n->src;
 864                 prefixlen = &n->src_prefixlen;
 865         } else
 866                 assert_not_reached(lvalue);
 867
 868         if (n->family == AF_UNSPEC)
 869                 r = in_addr_prefix_from_string_auto(rvalue, &n->family, buffer, prefixlen);
 870         else
 871                 r = in_addr_prefix_from_string(rvalue, n->family, buffer, prefixlen);
 872         if (r < 0) {
 873                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 874                            "Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
 875                 return 0;
 876         }
 877
 878         TAKE_PTR(n);
 879         return 0;
 880 }
 881
 882 int config_parse_route_priority(
 883                 const char *unit,
 884                 const char *filename,
 885                 unsigned line,
 886                 const char *section,
 887                 unsigned section_line,
 888                 const char *lvalue,
 889                 int ltype,
 890                 const char *rvalue,
 891                 void *data,
 892                 void *userdata) {
 893
 894         Network *network = userdata;
 895         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
 896         int r;
 897
 898         assert(filename);
 899         assert(section);
 900         assert(lvalue);
 901         assert(rvalue);
 902         assert(data);
 903
 904         r = route_new_static(network, filename, section_line, &n);
 905         if (r < 0)
 906                 return r;
 907
 908         r = safe_atou32(rvalue, &n->priority);
 909         if (r < 0) {
 910                 log_syntax(unit, LOG_ERR, filename, line, r,
 911                            "Could not parse route priority \"%s\", ignoring assignment: %m", rvalue);
 912                 return 0;
 913         }
 914
 915         TAKE_PTR(n);
 916         return 0;
 917 }
 918
 919 int config_parse_route_scope(
 920                 const char *unit,
 921                 const char *filename,
 922                 unsigned line,
 923                 const char *section,
 924                 unsigned section_line,
 925                 const char *lvalue,
 926                 int ltype,
 927                 const char *rvalue,
 928                 void *data,
 929                 void *userdata) {
 930
 931         Network *network = userdata;
 932         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
 933         int r;
 934
 935         assert(filename);
 936         assert(section);
 937         assert(lvalue);
 938         assert(rvalue);
 939         assert(data);
 940
 941         r = route_new_static(network, filename, section_line, &n);
 942         if (r < 0)
 943                 return r;
 944
 945         if (streq(rvalue, "host"))
 946                 n->scope = RT_SCOPE_HOST;
 947         else if (streq(rvalue, "link"))
 948                 n->scope = RT_SCOPE_LINK;
 949         else if (streq(rvalue, "global"))
 950                 n->scope = RT_SCOPE_UNIVERSE;
 951         else {
 952                 log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route scope: %s", rvalue);
 953                 return 0;
 954         }
 955
 956         TAKE_PTR(n);
 957         return 0;
 958 }
 959
 960 int config_parse_route_table(
 961                 const char *unit,
 962                 const char *filename,
 963                 unsigned line,
 964                 const char *section,
 965                 unsigned section_line,
 966                 const char *lvalue,
 967                 int ltype,
 968                 const char *rvalue,
 969                 void *data,
 970                 void *userdata) {
 971
 972         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
 973         Network *network = userdata;
 974         int r;
 975
 976         assert(filename);
 977         assert(section);
 978         assert(lvalue);
 979         assert(rvalue);
 980         assert(data);
 981
 982         r = route_new_static(network, filename, section_line, &n);
 983         if (r < 0)
 984                 return r;
 985
 986         r = safe_atou32(rvalue, &n->table);
 987         if (r < 0) {
 988                 log_syntax(unit, LOG_ERR, filename, line, r,
 989                            "Could not parse route table number \"%s\", ignoring assignment: %m", rvalue);
 990                 return 0;
 991         }
 992
 993         TAKE_PTR(n);
 994         return 0;
 995 }
 996
 997 int config_parse_gateway_onlink(
 998                 const char *unit,
 999                 const char *filename,
1000                 unsigned line,
1001                 const char *section,
1002                 unsigned section_line,
1003                 const char *lvalue,
1004                 int ltype,
1005                 const char *rvalue,
1006                 void *data,
1007                 void *userdata) {
1008
1009         Network *network = userdata;
1010         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1011         int r;
1012
1013         assert(filename);
1014         assert(section);
1015         assert(lvalue);
1016         assert(rvalue);
1017         assert(data);
1018
1019         r = route_new_static(network, filename, section_line, &n);
1020         if (r < 0)
1021                 return r;
1022
1023         r = parse_boolean(rvalue);
1024         if (r < 0) {
1025                 log_syntax(unit, LOG_ERR, filename, line, r,
1026                            "Could not parse %s=\"%s\", ignoring assignment: %m", lvalue, rvalue);
1027                 return 0;
1028         }
1029
1030         n->gateway_onlink = r;
1031
1032         TAKE_PTR(n);
1033         return 0;
1034 }
1035
1036 int config_parse_ipv6_route_preference(
1037                 const char *unit,
1038                 const char *filename,
1039                 unsigned line,
1040                 const char *section,
1041                 unsigned section_line,
1042                 const char *lvalue,
1043                 int ltype,
1044                 const char *rvalue,
1045                 void *data,
1046                 void *userdata) {
1047
1048         Network *network = userdata;
1049         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1050         int r;
1051
1052         r = route_new_static(network, filename, section_line, &n);
1053         if (r < 0)
1054                 return r;
1055
1056         if (streq(rvalue, "low"))
1057                 n->pref = ICMPV6_ROUTER_PREF_LOW;
1058         else if (streq(rvalue, "medium"))
1059                 n->pref = ICMPV6_ROUTER_PREF_MEDIUM;
1060         else if (streq(rvalue, "high"))
1061                 n->pref = ICMPV6_ROUTER_PREF_HIGH;
1062         else {
1063                 log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route preference: %s", rvalue);
1064                 return 0;
1065         }
1066
1067         TAKE_PTR(n);
1068         return 0;
1069 }
1070
1071 int config_parse_route_protocol(
1072                 const char *unit,
1073                 const char *filename,
1074                 unsigned line,
1075                 const char *section,
1076                 unsigned section_line,
1077                 const char *lvalue,
1078                 int ltype,
1079                 const char *rvalue,
1080                 void *data,
1081                 void *userdata) {
1082
1083         Network *network = userdata;
1084         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1085         int r;
1086
1087         r = route_new_static(network, filename, section_line, &n);
1088         if (r < 0)
1089                 return r;
1090
1091         if (streq(rvalue, "kernel"))
1092                 n->protocol = RTPROT_KERNEL;
1093         else if (streq(rvalue, "boot"))
1094                 n->protocol = RTPROT_BOOT;
1095         else if (streq(rvalue, "static"))
1096                 n->protocol = RTPROT_STATIC;
1097         else {
1098                 r = safe_atou8(rvalue , &n->protocol);
1099                 if (r < 0) {
1100                         log_syntax(unit, LOG_ERR, filename, line, r,
1101                                    "Could not parse route protocol \"%s\", ignoring assignment: %m", rvalue);
1102                         return 0;
1103                 }
1104         }
1105
1106         TAKE_PTR(n);
1107         return 0;
1108 }
1109
1110 int config_parse_route_type(
1111                 const char *unit,
1112                 const char *filename,
1113                 unsigned line,
1114                 const char *section,
1115                 unsigned section_line,
1116                 const char *lvalue,
1117                 int ltype,
1118                 const char *rvalue,
1119                 void *data,
1120                 void *userdata) {
1121
1122         Network *network = userdata;
1123         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1124         int r;
1125
1126         r = route_new_static(network, filename, section_line, &n);
1127         if (r < 0)
1128                 return r;
1129
1130         if (streq(rvalue, "unicast"))
1131                 n->type = RTN_UNICAST;
1132         else if (streq(rvalue, "blackhole"))
1133                 n->type = RTN_BLACKHOLE;
1134         else if (streq(rvalue, "unreachable"))
1135                 n->type = RTN_UNREACHABLE;
1136         else if (streq(rvalue, "prohibit"))
1137                 n->type = RTN_PROHIBIT;
1138         else if (streq(rvalue, "throw"))
1139                 n->type = RTN_THROW;
1140         else {
1141                 log_syntax(unit, LOG_ERR, filename, line, r,
1142                            "Could not parse route type \"%s\", ignoring assignment: %m", rvalue);
1143                 return 0;
1144         }
1145
1146         TAKE_PTR(n);
1147         return 0;
1148 }
1149
1150 int config_parse_tcp_window(
1151                 const char *unit,
1152                 const char *filename,
1153                 unsigned line,
1154                 const char *section,
1155                 unsigned section_line,
1156                 const char *lvalue,
1157                 int ltype,
1158                 const char *rvalue,
1159                 void *data,
1160                 void *userdata) {
1161
1162         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1163         Network *network = userdata;
1164         uint64_t k;
1165         int r;
1166
1167         assert(filename);
1168         assert(section);
1169         assert(lvalue);
1170         assert(rvalue);
1171         assert(data);
1172
1173         r = route_new_static(network, filename, section_line, &n);
1174         if (r < 0)
1175                 return r;
1176
1177         r = parse_size(rvalue, 1024, &k);
1178         if (r < 0) {
1179                 log_syntax(unit, LOG_ERR, filename, line, r,
1180                            "Could not parse TCP %s \"%s\", ignoring assignment: %m", lvalue, rvalue);
1181                 return 0;
1182         }
1183         if (k > UINT32_MAX) {
1184                 log_syntax(unit, LOG_ERR, filename, line, 0,
1185                            "Specified TCP %s \"%s\" is too large, ignoring assignment: %m", lvalue, rvalue);
1186                 return 0;
1187         }
1188
1189         if (streq(lvalue, "InitialCongestionWindow"))
1190                 n->initcwnd = k;
1191         else if (streq(lvalue, "InitialAdvertisedReceiveWindow"))
1192                 n->initrwnd = k;
1193         else
1194                 assert_not_reached("Invalid TCP window type.");
1195
1196         TAKE_PTR(n);
1197         return 0;
1198 }
1199
1200 int config_parse_quickack(
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         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1213         Network *network = userdata;
1214         int k, 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         k = parse_boolean(rvalue);
1227         if (k < 0) {
1228                 log_syntax(unit, LOG_ERR, filename, line, k,
1229                            "Failed to parse TCP quickack, ignoring: %s", rvalue);
1230                 return 0;
1231         }
1232
1233         n->quickack = !!k;
1234         TAKE_PTR(n);
1235         return 0;
1236 }
1237
1238 int config_parse_fast_open_no_cookie(
1239                 const char *unit,
1240                 const char *filename,
1241                 unsigned line,
1242                 const char *section,
1243                 unsigned section_line,
1244                 const char *lvalue,
1245                 int ltype,
1246                 const char *rvalue,
1247                 void *data,
1248                 void *userdata) {
1249
1250         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1251         Network *network = userdata;
1252         int k, r;
1253
1254         assert(filename);
1255         assert(section);
1256         assert(lvalue);
1257         assert(rvalue);
1258         assert(data);
1259
1260         r = route_new_static(network, filename, section_line, &n);
1261         if (r < 0)
1262                 return r;
1263
1264         k = parse_boolean(rvalue);
1265         if (k < 0) {
1266                 log_syntax(unit, LOG_ERR, filename, line, k,
1267                            "Failed to parse TCP fastopen no cookie, ignoring: %s", rvalue);
1268                 return 0;
1269         }
1270
1271         n->fast_open_no_cookie = k;
1272         TAKE_PTR(n);
1273         return 0;
1274 }
1275
1276 int config_parse_route_mtu(
1277                 const char *unit,
1278                 const char *filename,
1279                 unsigned line,
1280                 const char *section,
1281                 unsigned section_line,
1282                 const char *lvalue,
1283                 int ltype,
1284                 const char *rvalue,
1285                 void *data,
1286                 void *userdata) {
1287
1288         Network *network = userdata;
1289         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1290         int r;
1291
1292         assert(filename);
1293         assert(section);
1294         assert(lvalue);
1295         assert(rvalue);
1296         assert(data);
1297
1298         r = route_new_static(network, filename, section_line, &n);
1299         if (r < 0)
1300                 return r;
1301
1302         r = config_parse_mtu(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &n->mtu, userdata);
1303         if (r < 0)
1304                 return r;
1305
1306         TAKE_PTR(n);
1307         return 0;
1308 }
1309
1310 int config_parse_route_ttl_propagate(
1311                 const char *unit,
1312                 const char *filename,
1313                 unsigned line,
1314                 const char *section,
1315                 unsigned section_line,
1316                 const char *lvalue,
1317                 int ltype,
1318                 const char *rvalue,
1319                 void *data,
1320                 void *userdata) {
1321
1322         Network *network = userdata;
1323         _cleanup_(route_free_or_set_invalidp) Route *n = NULL;
1324         int r, k;
1325
1326         assert(filename);
1327         assert(section);
1328         assert(lvalue);
1329         assert(rvalue);
1330         assert(data);
1331
1332         r = route_new_static(network, filename, section_line, &n);
1333         if (r < 0)
1334                 return r;
1335
1336         k = parse_boolean(rvalue);
1337         if (k < 0) {
1338                 log_syntax(unit, LOG_ERR, filename, line, k,
1339                            "Failed to parse TTLPropagate= value, ignoring: %s", rvalue);
1340                 return 0;
1341         }
1342
1343         n->ttl_propagate = k;
1344
1345         TAKE_PTR(n);
1346         return 0;
1347 }
1348
1349 int route_section_verify(Route *route, Network *network) {
1350         if (section_is_invalid(route->section))
1351                 return -EINVAL;
1352
1353         if (route->family == AF_UNSPEC) {
1354                 assert(route->section);
1355
1356                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
1357                                          "%s: Route section without Gateway=, Destination=, Source=, "
1358                                          "or PreferredSource= field configured. "
1359                                          "Ignoring [Route] section from line %u.",
1360                                          route->section->filename, route->section->line);
1361         }
1362
1363         if (network->n_static_addresses == 0 &&
1364             in_addr_is_null(route->family, &route->gw) == 0 &&
1365             route->gateway_onlink < 0) {
1366                 log_warning("%s: Gateway= without static address configured. "
1367                             "Enabling GatewayOnLink= option.",
1368                             network->filename);
1369                 route->gateway_onlink = true;
1370         }
1371
1372         return 0;
1373 }