src/network/networkd-route.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Tom Gundersen <teg@jklm.no>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "alloc-util.h"
  21 #include "conf-parser.h"
  22 #include "in-addr-util.h"
  23 #include "netlink-util.h"
  24 #include "networkd-route.h"
  25 #include "networkd.h"
  26 #include "parse-util.h"
  27 #include "set.h"
  28 #include "string-util.h"
  29 #include "util.h"
  30
  31 #define ROUTES_PER_LINK_MAX 2048U
  32 #define STATIC_ROUTES_PER_NETWORK_MAX 1024U
  33
  34 int route_new(Route **ret) {
  35         _cleanup_route_free_ Route *route = NULL;
  36
  37         route = new0(Route, 1);
  38         if (!route)
  39                 return -ENOMEM;
  40
  41         route->family = AF_UNSPEC;
  42         route->scope = RT_SCOPE_UNIVERSE;
  43         route->protocol = RTPROT_UNSPEC;
  44         route->table = RT_TABLE_MAIN;
  45         route->lifetime = USEC_INFINITY;
  46
  47         *ret = route;
  48         route = NULL;
  49
  50         return 0;
  51 }
  52
  53 int route_new_static(Network *network, unsigned section, Route **ret) {
  54         _cleanup_route_free_ Route *route = NULL;
  55         int r;
  56
  57         assert(network);
  58         assert(ret);
  59
  60         if (section) {
  61                 route = hashmap_get(network->routes_by_section, UINT_TO_PTR(section));
  62                 if (route) {
  63                         *ret = route;
  64                         route = NULL;
  65
  66                         return 0;
  67                 }
  68         }
  69
  70         if (network->n_static_routes >= STATIC_ROUTES_PER_NETWORK_MAX)
  71                 return -E2BIG;
  72
  73         r = route_new(&route);
  74         if (r < 0)
  75                 return r;
  76
  77         route->protocol = RTPROT_STATIC;
  78
  79         if (section) {
  80                 route->section = section;
  81
  82                 r = hashmap_put(network->routes_by_section, UINT_TO_PTR(route->section), route);
  83                 if (r < 0)
  84                         return r;
  85         }
  86
  87         route->network = network;
  88         LIST_PREPEND(routes, network->static_routes, route);
  89         network->n_static_routes++;
  90
  91         *ret = route;
  92         route = NULL;
  93
  94         return 0;
  95 }
  96
  97 void route_free(Route *route) {
  98         if (!route)
  99                 return;
 100
 101         if (route->network) {
 102                 LIST_REMOVE(routes, route->network->static_routes, route);
 103
 104                 assert(route->network->n_static_routes > 0);
 105                 route->network->n_static_routes--;
 106
 107                 if (route->section)
 108                         hashmap_remove(route->network->routes_by_section, UINT_TO_PTR(route->section));
 109         }
 110
 111         if (route->link) {
 112                 set_remove(route->link->routes, route);
 113                 set_remove(route->link->routes_foreign, route);
 114         }
 115
 116         sd_event_source_unref(route->expire);
 117
 118         free(route);
 119 }
 120
 121 static void route_hash_func(const void *b, struct siphash *state) {
 122         const Route *route = b;
 123
 124         assert(route);
 125
 126         siphash24_compress(&route->family, sizeof(route->family), state);
 127
 128         switch (route->family) {
 129         case AF_INET:
 130         case AF_INET6:
 131                 /* Equality of routes are given by the 4-touple
 132                    (dst_prefix,dst_prefixlen,tos,priority,table) */
 133                 siphash24_compress(&route->dst, FAMILY_ADDRESS_SIZE(route->family), state);
 134                 siphash24_compress(&route->dst_prefixlen, sizeof(route->dst_prefixlen), state);
 135                 siphash24_compress(&route->tos, sizeof(route->tos), state);
 136                 siphash24_compress(&route->priority, sizeof(route->priority), state);
 137                 siphash24_compress(&route->table, sizeof(route->table), state);
 138
 139                 break;
 140         default:
 141                 /* treat any other address family as AF_UNSPEC */
 142                 break;
 143         }
 144 }
 145
 146 static int route_compare_func(const void *_a, const void *_b) {
 147         const Route *a = _a, *b = _b;
 148
 149         if (a->family < b->family)
 150                 return -1;
 151         if (a->family > b->family)
 152                 return 1;
 153
 154         switch (a->family) {
 155         case AF_INET:
 156         case AF_INET6:
 157                 if (a->dst_prefixlen < b->dst_prefixlen)
 158                         return -1;
 159                 if (a->dst_prefixlen > b->dst_prefixlen)
 160                         return 1;
 161
 162                 if (a->tos < b->tos)
 163                         return -1;
 164                 if (a->tos > b->tos)
 165                         return 1;
 166
 167                 if (a->priority < b->priority)
 168                         return -1;
 169                 if (a->priority > b->priority)
 170                         return 1;
 171
 172                 if (a->table < b->table)
 173                         return -1;
 174                 if (a->table > b->table)
 175                         return 1;
 176
 177                 return memcmp(&a->dst, &b->dst, FAMILY_ADDRESS_SIZE(a->family));
 178         default:
 179                 /* treat any other address family as AF_UNSPEC */
 180                 return 0;
 181         }
 182 }
 183
 184 static const struct hash_ops route_hash_ops = {
 185         .hash = route_hash_func,
 186         .compare = route_compare_func
 187 };
 188
 189 int route_get(Link *link,
 190               int family,
 191               const union in_addr_union *dst,
 192               unsigned char dst_prefixlen,
 193               unsigned char tos,
 194               uint32_t priority,
 195               unsigned char table,
 196               Route **ret) {
 197
 198         Route route, *existing;
 199
 200         assert(link);
 201         assert(dst);
 202
 203         route = (Route) {
 204                 .family = family,
 205                 .dst = *dst,
 206                 .dst_prefixlen = dst_prefixlen,
 207                 .tos = tos,
 208                 .priority = priority,
 209                 .table = table,
 210         };
 211
 212         existing = set_get(link->routes, &route);
 213         if (existing) {
 214                 if (ret)
 215                         *ret = existing;
 216                 return 1;
 217         }
 218
 219         existing = set_get(link->routes_foreign, &route);
 220         if (existing) {
 221                 if (ret)
 222                         *ret = existing;
 223                 return 0;
 224         }
 225
 226         return -ENOENT;
 227 }
 228
 229 static int route_add_internal(
 230                 Link *link,
 231                 Set **routes,
 232                 int family,
 233                 const union in_addr_union *dst,
 234                 unsigned char dst_prefixlen,
 235                 unsigned char tos,
 236                 uint32_t priority,
 237                 unsigned char table,
 238                 Route **ret) {
 239
 240         _cleanup_route_free_ Route *route = NULL;
 241         int r;
 242
 243         assert(link);
 244         assert(routes);
 245         assert(dst);
 246
 247         r = route_new(&route);
 248         if (r < 0)
 249                 return r;
 250
 251         route->family = family;
 252         route->dst = *dst;
 253         route->dst_prefixlen = dst_prefixlen;
 254         route->tos = tos;
 255         route->priority = priority;
 256         route->table = table;
 257
 258         r = set_ensure_allocated(routes, &route_hash_ops);
 259         if (r < 0)
 260                 return r;
 261
 262         r = set_put(*routes, route);
 263         if (r < 0)
 264                 return r;
 265
 266         route->link = link;
 267
 268         if (ret)
 269                 *ret = route;
 270
 271         route = NULL;
 272
 273         return 0;
 274 }
 275
 276 int route_add_foreign(
 277                 Link *link,
 278                 int family,
 279                 const union in_addr_union *dst,
 280                 unsigned char dst_prefixlen,
 281                 unsigned char tos,
 282                 uint32_t priority,
 283                 unsigned char table,
 284                 Route **ret) {
 285
 286         return route_add_internal(link, &link->routes_foreign, family, dst, dst_prefixlen, tos, priority, table, ret);
 287 }
 288
 289 int route_add(
 290               Link *link,
 291               int family,
 292               const union in_addr_union *dst,
 293               unsigned char dst_prefixlen,
 294               unsigned char tos,
 295               uint32_t priority,
 296               unsigned char table,
 297               Route **ret) {
 298
 299         Route *route;
 300         int r;
 301
 302         r = route_get(link, family, dst, dst_prefixlen, tos, priority, table, &route);
 303         if (r == -ENOENT) {
 304                 /* Route does not exist, create a new one */
 305                 r = route_add_internal(link, &link->routes, family, dst, dst_prefixlen, tos, priority, table, &route);
 306                 if (r < 0)
 307                         return r;
 308         } else if (r == 0) {
 309                 /* Take over a foreign route */
 310                 r = set_ensure_allocated(&link->routes, &route_hash_ops);
 311                 if (r < 0)
 312                         return r;
 313
 314                 r = set_put(link->routes, route);
 315                 if (r < 0)
 316                         return r;
 317
 318                 set_remove(link->routes_foreign, route);
 319         } else if (r == 1) {
 320                 /* Route exists, do nothing */
 321                 ;
 322         } else
 323                 return r;
 324
 325         if (ret)
 326                 *ret = route;
 327
 328         return 0;
 329 }
 330
 331 int route_update(Route *route,
 332                  const union in_addr_union *src,
 333                  unsigned char src_prefixlen,
 334                  const union in_addr_union *gw,
 335                  const union in_addr_union *prefsrc,
 336                  unsigned char scope,
 337                  unsigned char protocol) {
 338
 339         assert(route);
 340         assert(src);
 341         assert(gw);
 342         assert(prefsrc);
 343
 344         route->src = *src;
 345         route->src_prefixlen = src_prefixlen;
 346         route->gw = *gw;
 347         route->prefsrc = *prefsrc;
 348         route->scope = scope;
 349         route->protocol = protocol;
 350
 351         return 0;
 352 }
 353
 354 int route_remove(Route *route, Link *link,
 355                sd_netlink_message_handler_t callback) {
 356         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 357         int r;
 358
 359         assert(link);
 360         assert(link->manager);
 361         assert(link->manager->rtnl);
 362         assert(link->ifindex > 0);
 363         assert(route->family == AF_INET || route->family == AF_INET6);
 364
 365         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
 366                                       RTM_DELROUTE, route->family,
 367                                       route->protocol);
 368         if (r < 0)
 369                 return log_error_errno(r, "Could not create RTM_DELROUTE message: %m");
 370
 371         if (!in_addr_is_null(route->family, &route->gw)) {
 372                 if (route->family == AF_INET)
 373                         r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &route->gw.in);
 374                 else if (route->family == AF_INET6)
 375                         r = sd_netlink_message_append_in6_addr(req, RTA_GATEWAY, &route->gw.in6);
 376                 if (r < 0)
 377                         return log_error_errno(r, "Could not append RTA_GATEWAY attribute: %m");
 378         }
 379
 380         if (route->dst_prefixlen) {
 381                 if (route->family == AF_INET)
 382                         r = sd_netlink_message_append_in_addr(req, RTA_DST, &route->dst.in);
 383                 else if (route->family == AF_INET6)
 384                         r = sd_netlink_message_append_in6_addr(req, RTA_DST, &route->dst.in6);
 385                 if (r < 0)
 386                         return log_error_errno(r, "Could not append RTA_DST attribute: %m");
 387
 388                 r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
 389                 if (r < 0)
 390                         return log_error_errno(r, "Could not set destination prefix length: %m");
 391         }
 392
 393         if (route->src_prefixlen) {
 394                 if (route->family == AF_INET)
 395                         r = sd_netlink_message_append_in_addr(req, RTA_SRC, &route->src.in);
 396                 else if (route->family == AF_INET6)
 397                         r = sd_netlink_message_append_in6_addr(req, RTA_SRC, &route->src.in6);
 398                 if (r < 0)
 399                         return log_error_errno(r, "Could not append RTA_SRC attribute: %m");
 400
 401                 r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
 402                 if (r < 0)
 403                         return log_error_errno(r, "Could not set source prefix length: %m");
 404         }
 405
 406         if (!in_addr_is_null(route->family, &route->prefsrc)) {
 407                 if (route->family == AF_INET)
 408                         r = sd_netlink_message_append_in_addr(req, RTA_PREFSRC, &route->prefsrc.in);
 409                 else if (route->family == AF_INET6)
 410                         r = sd_netlink_message_append_in6_addr(req, RTA_PREFSRC, &route->prefsrc.in6);
 411                 if (r < 0)
 412                         return log_error_errno(r, "Could not append RTA_PREFSRC attribute: %m");
 413         }
 414
 415         r = sd_rtnl_message_route_set_scope(req, route->scope);
 416         if (r < 0)
 417                 return log_error_errno(r, "Could not set scope: %m");
 418
 419         r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
 420         if (r < 0)
 421                 return log_error_errno(r, "Could not append RTA_PRIORITY attribute: %m");
 422
 423         r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
 424         if (r < 0)
 425                 return log_error_errno(r, "Could not append RTA_OIF attribute: %m");
 426
 427         r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
 428         if (r < 0)
 429                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 430
 431         link_ref(link);
 432
 433         return 0;
 434 }
 435
 436 static int route_expire_callback(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
 437         Link *link = userdata;
 438         int r;
 439
 440         assert(rtnl);
 441         assert(m);
 442         assert(link);
 443         assert(link->ifname);
 444
 445         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 446                 return 1;
 447
 448         r = sd_netlink_message_get_errno(m);
 449         if (r < 0 && r != -EEXIST)
 450                 log_link_warning_errno(link, r, "could not remove route: %m");
 451
 452         return 1;
 453 }
 454
 455 int route_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) {
 456         Route *route = userdata;
 457         int r;
 458
 459         assert(route);
 460
 461         r = route_remove(route, route->link, route_expire_callback);
 462         if (r < 0)
 463                 log_warning_errno(r, "Could not remove route: %m");
 464         else
 465                 route_free(route);
 466
 467         return 1;
 468 }
 469
 470 int route_configure(
 471                 Route *route,
 472                 Link *link,
 473                 sd_netlink_message_handler_t callback) {
 474
 475         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 476         _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
 477         usec_t lifetime;
 478         int r;
 479
 480         assert(link);
 481         assert(link->manager);
 482         assert(link->manager->rtnl);
 483         assert(link->ifindex > 0);
 484         assert(route->family == AF_INET || route->family == AF_INET6);
 485
 486         if (route_get(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL) <= 0 &&
 487             set_size(link->routes) >= ROUTES_PER_LINK_MAX)
 488                 return -E2BIG;
 489
 490         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
 491                                       RTM_NEWROUTE, route->family,
 492                                       route->protocol);
 493         if (r < 0)
 494                 return log_error_errno(r, "Could not create RTM_NEWROUTE message: %m");
 495
 496         if (!in_addr_is_null(route->family, &route->gw)) {
 497                 if (route->family == AF_INET)
 498                         r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &route->gw.in);
 499                 else if (route->family == AF_INET6)
 500                         r = sd_netlink_message_append_in6_addr(req, RTA_GATEWAY, &route->gw.in6);
 501                 if (r < 0)
 502                         return log_error_errno(r, "Could not append RTA_GATEWAY attribute: %m");
 503
 504                 r = sd_rtnl_message_route_set_family(req, route->family);
 505                 if (r < 0)
 506                         return log_error_errno(r, "Could not set route family: %m");
 507         }
 508
 509         if (route->dst_prefixlen) {
 510                 if (route->family == AF_INET)
 511                         r = sd_netlink_message_append_in_addr(req, RTA_DST, &route->dst.in);
 512                 else if (route->family == AF_INET6)
 513                         r = sd_netlink_message_append_in6_addr(req, RTA_DST, &route->dst.in6);
 514                 if (r < 0)
 515                         return log_error_errno(r, "Could not append RTA_DST attribute: %m");
 516
 517                 r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
 518                 if (r < 0)
 519                         return log_error_errno(r, "Could not set destination prefix length: %m");
 520         }
 521
 522         if (route->src_prefixlen) {
 523                 if (route->family == AF_INET)
 524                         r = sd_netlink_message_append_in_addr(req, RTA_SRC, &route->src.in);
 525                 else if (route->family == AF_INET6)
 526                         r = sd_netlink_message_append_in6_addr(req, RTA_SRC, &route->src.in6);
 527                 if (r < 0)
 528                         return log_error_errno(r, "Could not append RTA_SRC attribute: %m");
 529
 530                 r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
 531                 if (r < 0)
 532                         return log_error_errno(r, "Could not set source prefix length: %m");
 533         }
 534
 535         if (!in_addr_is_null(route->family, &route->prefsrc)) {
 536                 if (route->family == AF_INET)
 537                         r = sd_netlink_message_append_in_addr(req, RTA_PREFSRC, &route->prefsrc.in);
 538                 else if (route->family == AF_INET6)
 539                         r = sd_netlink_message_append_in6_addr(req, RTA_PREFSRC, &route->prefsrc.in6);
 540                 if (r < 0)
 541                         return log_error_errno(r, "Could not append RTA_PREFSRC attribute: %m");
 542         }
 543
 544         r = sd_rtnl_message_route_set_scope(req, route->scope);
 545         if (r < 0)
 546                 return log_error_errno(r, "Could not set scope: %m");
 547
 548         r = sd_rtnl_message_route_set_flags(req, route->flags);
 549         if (r < 0)
 550                 return log_error_errno(r, "Could not set flags: %m");
 551
 552         if (route->table != RT_TABLE_MAIN) {
 553                 if (route->table < 256) {
 554                         r = sd_rtnl_message_route_set_table(req, route->table);
 555                         if (r < 0)
 556                                 return log_error_errno(r, "Could not set route table: %m");
 557                 } else {
 558                         r = sd_rtnl_message_route_set_table(req, RT_TABLE_UNSPEC);
 559                         if (r < 0)
 560                                 return log_error_errno(r, "Could not set route table: %m");
 561
 562                         /* Table attribute to allow more than 256. */
 563                         r = sd_netlink_message_append_data(req, RTA_TABLE, &route->table, sizeof(route->table));
 564                         if (r < 0)
 565                                 return log_error_errno(r, "Could not append RTA_TABLE attribute: %m");
 566                 }
 567         }
 568
 569         r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
 570         if (r < 0)
 571                 return log_error_errno(r, "Could not append RTA_PRIORITY attribute: %m");
 572
 573         r = sd_netlink_message_append_u8(req, RTA_PREF, route->pref);
 574         if (r < 0)
 575                 return log_error_errno(r, "Could not append RTA_PREF attribute: %m");
 576
 577         r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
 578         if (r < 0)
 579                 return log_error_errno(r, "Could not append RTA_OIF attribute: %m");
 580
 581         r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
 582         if (r < 0)
 583                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 584
 585         link_ref(link);
 586
 587         lifetime = route->lifetime;
 588
 589         r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, &route);
 590         if (r < 0)
 591                 return log_error_errno(r, "Could not add route: %m");
 592
 593         /* TODO: drop expiration handling once it can be pushed into the kernel */
 594         route->lifetime = lifetime;
 595
 596         if (route->lifetime != USEC_INFINITY) {
 597                 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(),
 598                                       route->lifetime, 0, route_expire_handler, route);
 599                 if (r < 0)
 600                         return log_error_errno(r, "Could not arm expiration timer: %m");
 601         }
 602
 603         sd_event_source_unref(route->expire);
 604         route->expire = expire;
 605         expire = NULL;
 606
 607         return 0;
 608 }
 609
 610 int config_parse_gateway(const char *unit,
 611                 const char *filename,
 612                 unsigned line,
 613                 const char *section,
 614                 unsigned section_line,
 615                 const char *lvalue,
 616                 int ltype,
 617                 const char *rvalue,
 618                 void *data,
 619                 void *userdata) {
 620
 621         Network *network = userdata;
 622         _cleanup_route_free_ Route *n = NULL;
 623         union in_addr_union buffer;
 624         int r, f;
 625
 626         assert(filename);
 627         assert(section);
 628         assert(lvalue);
 629         assert(rvalue);
 630         assert(data);
 631
 632         if (streq(section, "Network")) {
 633                 /* we are not in an Route section, so treat
 634                  * this as the special '0' section */
 635                 section_line = 0;
 636         }
 637
 638         r = route_new_static(network, section_line, &n);
 639         if (r < 0)
 640                 return r;
 641
 642         r = in_addr_from_string_auto(rvalue, &f, &buffer);
 643         if (r < 0) {
 644                 log_syntax(unit, LOG_ERR, filename, line, r, "Route is invalid, ignoring assignment: %s", rvalue);
 645                 return 0;
 646         }
 647
 648         n->family = f;
 649         n->gw = buffer;
 650         n = NULL;
 651
 652         return 0;
 653 }
 654
 655 int config_parse_preferred_src(const char *unit,
 656                 const char *filename,
 657                 unsigned line,
 658                 const char *section,
 659                 unsigned section_line,
 660                 const char *lvalue,
 661                 int ltype,
 662                 const char *rvalue,
 663                 void *data,
 664                 void *userdata) {
 665
 666         Network *network = userdata;
 667         _cleanup_route_free_ Route *n = NULL;
 668         union in_addr_union buffer;
 669         int r, f;
 670
 671         assert(filename);
 672         assert(section);
 673         assert(lvalue);
 674         assert(rvalue);
 675         assert(data);
 676
 677         r = route_new_static(network, section_line, &n);
 678         if (r < 0)
 679                 return r;
 680
 681         r = in_addr_from_string_auto(rvalue, &f, &buffer);
 682         if (r < 0) {
 683                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 684                            "Preferred source is invalid, ignoring assignment: %s", rvalue);
 685                 return 0;
 686         }
 687
 688         n->family = f;
 689         n->prefsrc = buffer;
 690         n = NULL;
 691
 692         return 0;
 693 }
 694
 695 int config_parse_destination(const char *unit,
 696                 const char *filename,
 697                 unsigned line,
 698                 const char *section,
 699                 unsigned section_line,
 700                 const char *lvalue,
 701                 int ltype,
 702                 const char *rvalue,
 703                 void *data,
 704                 void *userdata) {
 705
 706         Network *network = userdata;
 707         _cleanup_route_free_ Route *n = NULL;
 708         const char *address, *e;
 709         union in_addr_union buffer;
 710         unsigned char prefixlen;
 711         int r, f;
 712
 713         assert(filename);
 714         assert(section);
 715         assert(lvalue);
 716         assert(rvalue);
 717         assert(data);
 718
 719         r = route_new_static(network, section_line, &n);
 720         if (r < 0)
 721                 return r;
 722
 723         /* Destination|Source=address/prefixlen */
 724
 725         /* address */
 726         e = strchr(rvalue, '/');
 727         if (e)
 728                 address = strndupa(rvalue, e - rvalue);
 729         else
 730                 address = rvalue;
 731
 732         r = in_addr_from_string_auto(address, &f, &buffer);
 733         if (r < 0) {
 734                 log_syntax(unit, LOG_ERR, filename, line, r, "Destination is invalid, ignoring assignment: %s", address);
 735                 return 0;
 736         }
 737
 738         if (f != AF_INET && f != AF_INET6) {
 739                 log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown address family, ignoring assignment: %s", address);
 740                 return 0;
 741         }
 742
 743         /* prefixlen */
 744         if (e) {
 745                 r = safe_atou8(e + 1, &prefixlen);
 746                 if (r < 0) {
 747                         log_syntax(unit, LOG_ERR, filename, line, r, "Route destination prefix length is invalid, ignoring assignment: %s", e + 1);
 748                         return 0;
 749                 }
 750         } else {
 751                 switch (f) {
 752                         case AF_INET:
 753                                 prefixlen = 32;
 754                                 break;
 755                         case AF_INET6:
 756                                 prefixlen = 128;
 757                                 break;
 758                 }
 759         }
 760
 761         n->family = f;
 762         if (streq(lvalue, "Destination")) {
 763                 n->dst = buffer;
 764                 n->dst_prefixlen = prefixlen;
 765         } else if (streq(lvalue, "Source")) {
 766                 n->src = buffer;
 767                 n->src_prefixlen = prefixlen;
 768         } else
 769                 assert_not_reached(lvalue);
 770
 771         n = NULL;
 772
 773         return 0;
 774 }
 775
 776 int config_parse_route_priority(const char *unit,
 777                                 const char *filename,
 778                                 unsigned line,
 779                                 const char *section,
 780                                 unsigned section_line,
 781                                 const char *lvalue,
 782                                 int ltype,
 783                                 const char *rvalue,
 784                                 void *data,
 785                                 void *userdata) {
 786         Network *network = userdata;
 787         _cleanup_route_free_ Route *n = NULL;
 788         uint32_t k;
 789         int r;
 790
 791         assert(filename);
 792         assert(section);
 793         assert(lvalue);
 794         assert(rvalue);
 795         assert(data);
 796
 797         r = route_new_static(network, section_line, &n);
 798         if (r < 0)
 799                 return r;
 800
 801         r = safe_atou32(rvalue, &k);
 802         if (r < 0) {
 803                 log_syntax(unit, LOG_ERR, filename, line, r,
 804                            "Could not parse route priority \"%s\", ignoring assignment: %m", rvalue);
 805                 return 0;
 806         }
 807
 808         n->priority = k;
 809         n = NULL;
 810
 811         return 0;
 812 }
 813
 814 int config_parse_route_scope(const char *unit,
 815                              const char *filename,
 816                              unsigned line,
 817                              const char *section,
 818                              unsigned section_line,
 819                              const char *lvalue,
 820                              int ltype,
 821                              const char *rvalue,
 822                              void *data,
 823                              void *userdata) {
 824         Network *network = userdata;
 825         _cleanup_route_free_ Route *n = NULL;
 826         int r;
 827
 828         assert(filename);
 829         assert(section);
 830         assert(lvalue);
 831         assert(rvalue);
 832         assert(data);
 833
 834         r = route_new_static(network, section_line, &n);
 835         if (r < 0)
 836                 return r;
 837
 838         if (streq(rvalue, "host"))
 839                 n->scope = RT_SCOPE_HOST;
 840         else if (streq(rvalue, "link"))
 841                 n->scope = RT_SCOPE_LINK;
 842         else if (streq(rvalue, "global"))
 843                 n->scope = RT_SCOPE_UNIVERSE;
 844         else {
 845                 log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route scope: %s", rvalue);
 846                 return 0;
 847         }
 848
 849         n = NULL;
 850
 851         return 0;
 852 }
 853
 854 int config_parse_route_table(const char *unit,
 855                              const char *filename,
 856                              unsigned line,
 857                              const char *section,
 858                              unsigned section_line,
 859                              const char *lvalue,
 860                              int ltype,
 861                              const char *rvalue,
 862                              void *data,
 863                              void *userdata) {
 864         _cleanup_route_free_ Route *n = NULL;
 865         Network *network = userdata;
 866         uint32_t k;
 867         int r;
 868
 869         assert(filename);
 870         assert(section);
 871         assert(lvalue);
 872         assert(rvalue);
 873         assert(data);
 874
 875         r = route_new_static(network, section_line, &n);
 876         if (r < 0)
 877                 return r;
 878
 879         r = safe_atou32(rvalue, &k);
 880         if (r < 0) {
 881                 log_syntax(unit, LOG_ERR, filename, line, r,
 882                            "Could not parse route table number \"%s\", ignoring assignment: %m", rvalue);
 883                 return 0;
 884         }
 885
 886         n->table = k;
 887
 888         n = NULL;
 889
 890         return 0;
 891 }