src/network/networkd-routing-policy-rule.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <net/if.h>
   4 #include <linux/fib_rules.h>
   5
   6 #include "alloc-util.h"
   7 #include "conf-parser.h"
   8 #include "fileio.h"
   9 #include "ip-protocol-list.h"
  10 #include "networkd-routing-policy-rule.h"
  11 #include "netlink-util.h"
  12 #include "networkd-manager.h"
  13 #include "parse-util.h"
  14 #include "socket-util.h"
  15 #include "string-util.h"
  16 #include "strv.h"
  17
  18 int routing_policy_rule_new(RoutingPolicyRule **ret) {
  19         RoutingPolicyRule *rule;
  20
  21         rule = new(RoutingPolicyRule, 1);
  22         if (!rule)
  23                 return -ENOMEM;
  24
  25         *rule = (RoutingPolicyRule) {
  26                 .family = AF_INET,
  27                 .table = RT_TABLE_MAIN,
  28         };
  29
  30         *ret = rule;
  31         return 0;
  32 }
  33
  34 void routing_policy_rule_free(RoutingPolicyRule *rule) {
  35
  36         if (!rule)
  37                 return;
  38
  39         if (rule->network) {
  40                 LIST_REMOVE(rules, rule->network->rules, rule);
  41                 assert(rule->network->n_rules > 0);
  42                 rule->network->n_rules--;
  43
  44                 if (rule->section)
  45                         hashmap_remove(rule->network->rules_by_section, rule->section);
  46         }
  47
  48         if (rule->manager) {
  49                 if (set_get(rule->manager->rules, rule) == rule)
  50                         set_remove(rule->manager->rules, rule);
  51                 if (set_get(rule->manager->rules_foreign, rule) == rule)
  52                         set_remove(rule->manager->rules_foreign, rule);
  53         }
  54
  55         network_config_section_free(rule->section);
  56         free(rule->iif);
  57         free(rule->oif);
  58         free(rule);
  59 }
  60
  61 static void routing_policy_rule_hash_func(const RoutingPolicyRule *rule, struct siphash *state) {
  62         assert(rule);
  63
  64         siphash24_compress(&rule->family, sizeof(rule->family), state);
  65
  66         switch (rule->family) {
  67         case AF_INET:
  68         case AF_INET6:
  69
  70                 siphash24_compress(&rule->from, FAMILY_ADDRESS_SIZE(rule->family), state);
  71                 siphash24_compress(&rule->from_prefixlen, sizeof(rule->from_prefixlen), state);
  72
  73                 siphash24_compress(&rule->to, FAMILY_ADDRESS_SIZE(rule->family), state);
  74                 siphash24_compress(&rule->to_prefixlen, sizeof(rule->to_prefixlen), state);
  75
  76                 siphash24_compress(&rule->tos, sizeof(rule->tos), state);
  77                 siphash24_compress(&rule->fwmark, sizeof(rule->fwmark), state);
  78                 siphash24_compress(&rule->table, sizeof(rule->table), state);
  79
  80                 siphash24_compress(&rule->protocol, sizeof(rule->protocol), state);
  81                 siphash24_compress(&rule->sport, sizeof(rule->sport), state);
  82                 siphash24_compress(&rule->dport, sizeof(rule->dport), state);
  83
  84                 if (rule->iif)
  85                         siphash24_compress(rule->iif, strlen(rule->iif), state);
  86
  87                 if (rule->oif)
  88                         siphash24_compress(rule->oif, strlen(rule->oif), state);
  89
  90                 break;
  91         default:
  92                 /* treat any other address family as AF_UNSPEC */
  93                 break;
  94         }
  95 }
  96
  97 static int routing_policy_rule_compare_func(const RoutingPolicyRule *a, const RoutingPolicyRule *b) {
  98         int r;
  99
 100         r = CMP(a->family, b->family);
 101         if (r != 0)
 102                 return r;
 103
 104         switch (a->family) {
 105         case AF_INET:
 106         case AF_INET6:
 107                 r = CMP(a->from_prefixlen, b->from_prefixlen);
 108                 if (r != 0)
 109                         return r;
 110
 111                 r = CMP(a->to_prefixlen, b->to_prefixlen);
 112                 if (r != 0)
 113                         return r;
 114
 115                 r = CMP(a->tos, b->tos);
 116                 if (r != 0)
 117                         return r;
 118
 119                 r = CMP(a->fwmask, b->fwmask);
 120                 if (r != 0)
 121                         return r;
 122
 123                 r = CMP(a->table, b->table);
 124                 if (r != 0)
 125                         return r;
 126
 127                 r = strcmp_ptr(a->iif, b->iif);
 128                 if (!r)
 129                         return r;
 130
 131                 r = strcmp_ptr(a->oif, b->oif);
 132                 if (!r)
 133                         return r;
 134
 135                 r = CMP(a->protocol, b->protocol);
 136                 if (r != 0)
 137                         return r;
 138
 139                 r = memcmp(&a->sport, &b->sport, sizeof(a->sport));
 140                 if (r != 0)
 141                         return r;
 142
 143                 r = memcmp(&a->dport, &b->dport, sizeof(a->dport));
 144                 if (r != 0)
 145                         return r;
 146
 147                 r = memcmp(&a->from, &b->from, FAMILY_ADDRESS_SIZE(a->family));
 148                 if (r != 0)
 149                         return r;
 150
 151                 return memcmp(&a->to, &b->to, FAMILY_ADDRESS_SIZE(a->family));
 152
 153         default:
 154                 /* treat any other address family as AF_UNSPEC */
 155                 return 0;
 156         }
 157 }
 158
 159 DEFINE_PRIVATE_HASH_OPS(routing_policy_rule_hash_ops, RoutingPolicyRule, routing_policy_rule_hash_func, routing_policy_rule_compare_func);
 160
 161 int routing_policy_rule_get(Manager *m,
 162                             int family,
 163                             const union in_addr_union *from,
 164                             uint8_t from_prefixlen,
 165                             const union in_addr_union *to,
 166                             uint8_t to_prefixlen,
 167                             uint8_t tos,
 168                             uint32_t fwmark,
 169                             uint32_t table,
 170                             const char *iif,
 171                             const char *oif,
 172                             uint8_t protocol,
 173                             struct fib_rule_port_range *sport,
 174                             struct fib_rule_port_range *dport,
 175                             RoutingPolicyRule **ret) {
 176
 177         RoutingPolicyRule rule, *existing;
 178
 179         assert_return(m, -1);
 180
 181         rule = (RoutingPolicyRule) {
 182                 .family = family,
 183                 .from = *from,
 184                 .from_prefixlen = from_prefixlen,
 185                 .to = *to,
 186                 .to_prefixlen = to_prefixlen,
 187                 .tos = tos,
 188                 .fwmark = fwmark,
 189                 .table = table,
 190                 .iif = (char*) iif,
 191                 .oif = (char*) oif,
 192                 .protocol = protocol,
 193                 .sport = *sport,
 194                 .dport = *dport,
 195         };
 196
 197         existing = set_get(m->rules, &rule);
 198         if (existing) {
 199                 if (ret)
 200                         *ret = existing;
 201                 return 1;
 202         }
 203
 204         existing = set_get(m->rules_foreign, &rule);
 205         if (existing) {
 206                 if (ret)
 207                         *ret = existing;
 208                 return 0;
 209         }
 210
 211         return -ENOENT;
 212 }
 213
 214 int routing_policy_rule_make_local(Manager *m, RoutingPolicyRule *rule) {
 215         int r;
 216
 217         assert(m);
 218
 219         if (set_contains(m->rules_foreign, rule)) {
 220                 set_remove(m->rules_foreign, rule);
 221
 222                 r = set_ensure_allocated(&m->rules, &routing_policy_rule_hash_ops);
 223                 if (r < 0)
 224                         return r;
 225
 226                 return set_put(m->rules, rule);
 227         }
 228
 229         return -ENOENT;
 230 }
 231
 232 static int routing_policy_rule_add_internal(Manager *m,
 233                                             Set **rules,
 234                                             int family,
 235                                             const union in_addr_union *from,
 236                                             uint8_t from_prefixlen,
 237                                             const union in_addr_union *to,
 238                                             uint8_t to_prefixlen,
 239                                             uint8_t tos,
 240                                             uint32_t fwmark,
 241                                             uint32_t table,
 242                                             const char *_iif,
 243                                             const char *_oif,
 244                                             uint8_t protocol,
 245                                             const struct fib_rule_port_range *sport,
 246                                             const struct fib_rule_port_range *dport,
 247                                             RoutingPolicyRule **ret) {
 248
 249         _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *rule = NULL;
 250         _cleanup_free_ char *iif = NULL, *oif = NULL;
 251         int r;
 252
 253         assert_return(rules, -EINVAL);
 254
 255         if (_iif) {
 256                 iif = strdup(_iif);
 257                 if (!iif)
 258                         return -ENOMEM;
 259         }
 260
 261         if (_oif) {
 262                 oif = strdup(_oif);
 263                 if (!oif)
 264                         return -ENOMEM;
 265         }
 266
 267         r = routing_policy_rule_new(&rule);
 268         if (r < 0)
 269                 return r;
 270
 271         rule->manager = m;
 272         rule->family = family;
 273         rule->from = *from;
 274         rule->from_prefixlen = from_prefixlen;
 275         rule->to = *to;
 276         rule->to_prefixlen = to_prefixlen;
 277         rule->tos = tos;
 278         rule->fwmark = fwmark;
 279         rule->table = table;
 280         rule->iif = TAKE_PTR(iif);
 281         rule->oif = TAKE_PTR(oif);
 282         rule->protocol = protocol;
 283         rule->sport = *sport;
 284         rule->dport = *dport;
 285
 286         r = set_ensure_allocated(rules, &routing_policy_rule_hash_ops);
 287         if (r < 0)
 288                 return r;
 289
 290         r = set_put(*rules, rule);
 291         if (r < 0)
 292                 return r;
 293
 294         if (ret)
 295                 *ret = rule;
 296
 297         TAKE_PTR(rule);
 298         return 0;
 299 }
 300
 301 int routing_policy_rule_add(Manager *m,
 302                             int family,
 303                             const union in_addr_union *from,
 304                             uint8_t from_prefixlen,
 305                             const union in_addr_union *to,
 306                             uint8_t to_prefixlen,
 307                             uint8_t tos,
 308                             uint32_t fwmark,
 309                             uint32_t table,
 310                             const char *iif,
 311                             const char *oif,
 312                             uint8_t protocol,
 313                             const struct fib_rule_port_range *sport,
 314                             const struct fib_rule_port_range *dport,
 315                             RoutingPolicyRule **ret) {
 316
 317         return routing_policy_rule_add_internal(m, &m->rules, family, from, from_prefixlen, to, to_prefixlen, tos, fwmark, table, iif, oif, protocol, sport, dport, ret);
 318 }
 319
 320 int routing_policy_rule_add_foreign(Manager *m,
 321                                     int family,
 322                                     const union in_addr_union *from,
 323                                     uint8_t from_prefixlen,
 324                                     const union in_addr_union *to,
 325                                     uint8_t to_prefixlen,
 326                                     uint8_t tos,
 327                                     uint32_t fwmark,
 328                                     uint32_t table,
 329                                     const char *iif,
 330                                     const char *oif,
 331                                     uint8_t protocol,
 332                                     const struct fib_rule_port_range *sport,
 333                                     const struct fib_rule_port_range *dport,
 334                                     RoutingPolicyRule **ret) {
 335         return routing_policy_rule_add_internal(m, &m->rules_foreign, family, from, from_prefixlen, to, to_prefixlen, tos, fwmark, table, iif, oif, protocol, sport, dport, ret);
 336 }
 337
 338 static int routing_policy_rule_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 339         int r;
 340
 341         assert(m);
 342         assert(link);
 343         assert(link->ifname);
 344
 345         link->routing_policy_rule_remove_messages--;
 346
 347         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 348                 return 1;
 349
 350         r = sd_netlink_message_get_errno(m);
 351         if (r < 0)
 352                 log_link_warning_errno(link, r, "Could not drop routing policy rule: %m");
 353
 354         return 1;
 355 }
 356
 357 int routing_policy_rule_remove(RoutingPolicyRule *routing_policy_rule, Link *link, link_netlink_message_handler_t callback) {
 358         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 359         int r;
 360
 361         assert(routing_policy_rule);
 362         assert(link);
 363         assert(link->manager);
 364         assert(link->manager->rtnl);
 365         assert(link->ifindex > 0);
 366         assert(IN_SET(routing_policy_rule->family, AF_INET, AF_INET6));
 367
 368         r = sd_rtnl_message_new_routing_policy_rule(link->manager->rtnl, &m, RTM_DELRULE, routing_policy_rule->family);
 369         if (r < 0)
 370                 return log_error_errno(r, "Could not allocate RTM_DELRULE message: %m");
 371
 372         if (in_addr_is_null(routing_policy_rule->family, &routing_policy_rule->from) == 0) {
 373                 r = netlink_message_append_in_addr_union(m, FRA_SRC, routing_policy_rule->family, &routing_policy_rule->from);
 374                 if (r < 0)
 375                         return log_error_errno(r, "Could not append FRA_SRC attribute: %m");
 376
 377                 r = sd_rtnl_message_routing_policy_rule_set_rtm_src_prefixlen(m, routing_policy_rule->from_prefixlen);
 378                 if (r < 0)
 379                         return log_error_errno(r, "Could not set source prefix length: %m");
 380         }
 381
 382         if (in_addr_is_null(routing_policy_rule->family, &routing_policy_rule->to) == 0) {
 383                 r = netlink_message_append_in_addr_union(m, FRA_DST, routing_policy_rule->family, &routing_policy_rule->to);
 384                 if (r < 0)
 385                         return log_error_errno(r, "Could not append FRA_DST attribute: %m");
 386
 387                 r = sd_rtnl_message_routing_policy_rule_set_rtm_dst_prefixlen(m, routing_policy_rule->to_prefixlen);
 388                 if (r < 0)
 389                         return log_error_errno(r, "Could not set destination prefix length: %m");
 390         }
 391
 392         r = netlink_call_async(link->manager->rtnl, NULL, m,
 393                                callback ?: routing_policy_rule_remove_handler,
 394                                link_netlink_destroy_callback, link);
 395         if (r < 0)
 396                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 397
 398         link_ref(link);
 399
 400         return 0;
 401 }
 402
 403 static int routing_policy_rule_new_static(Network *network, const char *filename, unsigned section_line, RoutingPolicyRule **ret) {
 404         _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *rule = NULL;
 405         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
 406         int r;
 407
 408         assert(network);
 409         assert(ret);
 410         assert(!!filename == (section_line > 0));
 411
 412         if (filename) {
 413                 r = network_config_section_new(filename, section_line, &n);
 414                 if (r < 0)
 415                         return r;
 416
 417                 rule = hashmap_get(network->rules_by_section, n);
 418                 if (rule) {
 419                         *ret = TAKE_PTR(rule);
 420
 421                         return 0;
 422                 }
 423         }
 424
 425         r = routing_policy_rule_new(&rule);
 426         if (r < 0)
 427                 return r;
 428
 429         rule->network = network;
 430         LIST_APPEND(rules, network->rules, rule);
 431         network->n_rules++;
 432
 433         if (filename) {
 434                 rule->section = TAKE_PTR(n);
 435
 436                 r = hashmap_ensure_allocated(&network->rules_by_section, &network_config_hash_ops);
 437                 if (r < 0)
 438                         return r;
 439
 440                 r = hashmap_put(network->rules_by_section, rule->section, rule);
 441                 if (r < 0)
 442                         return r;
 443         }
 444
 445         *ret = TAKE_PTR(rule);
 446
 447         return 0;
 448 }
 449
 450 static int routing_policy_rule_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 451         int r;
 452
 453         assert(rtnl);
 454         assert(m);
 455         assert(link);
 456         assert(link->ifname);
 457         assert(link->routing_policy_rule_messages > 0);
 458
 459         link->routing_policy_rule_messages--;
 460
 461         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 462                 return 1;
 463
 464         r = sd_netlink_message_get_errno(m);
 465         if (r < 0 && r != -EEXIST)
 466                 log_link_warning_errno(link, r, "Could not add routing policy rule: %m");
 467
 468         if (link->routing_policy_rule_messages == 0) {
 469                 log_link_debug(link, "Routing policy rule configured");
 470                 link->routing_policy_rules_configured = true;
 471                 link_check_ready(link);
 472         }
 473
 474         return 1;
 475 }
 476
 477 int routing_policy_rule_configure(RoutingPolicyRule *rule, Link *link, link_netlink_message_handler_t callback) {
 478         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 479         int r;
 480
 481         assert(rule);
 482         assert(link);
 483         assert(link->ifindex > 0);
 484         assert(link->manager);
 485         assert(link->manager->rtnl);
 486
 487         r = sd_rtnl_message_new_routing_policy_rule(link->manager->rtnl, &m, RTM_NEWRULE, rule->family);
 488         if (r < 0)
 489                 return log_error_errno(r, "Could not allocate RTM_NEWRULE message: %m");
 490
 491         if (in_addr_is_null(rule->family, &rule->from) == 0) {
 492                 r = netlink_message_append_in_addr_union(m, FRA_SRC, rule->family, &rule->from);
 493                 if (r < 0)
 494                         return log_error_errno(r, "Could not append FRA_SRC attribute: %m");
 495
 496                 r = sd_rtnl_message_routing_policy_rule_set_rtm_src_prefixlen(m, rule->from_prefixlen);
 497                 if (r < 0)
 498                         return log_error_errno(r, "Could not set source prefix length: %m");
 499         }
 500
 501         if (in_addr_is_null(rule->family, &rule->to) == 0) {
 502                 r = netlink_message_append_in_addr_union(m, FRA_DST, rule->family, &rule->to);
 503                 if (r < 0)
 504                         return log_error_errno(r, "Could not append FRA_DST attribute: %m");
 505
 506                 r = sd_rtnl_message_routing_policy_rule_set_rtm_dst_prefixlen(m, rule->to_prefixlen);
 507                 if (r < 0)
 508                         return log_error_errno(r, "Could not set destination prefix length: %m");
 509         }
 510
 511         r = sd_netlink_message_append_u32(m, FRA_PRIORITY, rule->priority);
 512         if (r < 0)
 513                 return log_error_errno(r, "Could not append FRA_PRIORITY attribute: %m");
 514
 515         if (rule->tos > 0) {
 516                 r = sd_rtnl_message_routing_policy_rule_set_tos(m, rule->tos);
 517                 if (r < 0)
 518                         return log_error_errno(r, "Could not set ip rule tos: %m");
 519         }
 520
 521         if (rule->table < 256) {
 522                 r = sd_rtnl_message_routing_policy_rule_set_table(m, rule->table);
 523                 if (r < 0)
 524                         return log_error_errno(r, "Could not set ip rule table: %m");
 525         } else {
 526                 r = sd_rtnl_message_routing_policy_rule_set_table(m, RT_TABLE_UNSPEC);
 527                 if (r < 0)
 528                         return log_error_errno(r, "Could not set ip rule table: %m");
 529
 530                 r = sd_netlink_message_append_u32(m, FRA_TABLE, rule->table);
 531                 if (r < 0)
 532                         return log_error_errno(r, "Could not append FRA_TABLE attribute: %m");
 533         }
 534
 535         if (rule->fwmark > 0) {
 536                 r = sd_netlink_message_append_u32(m, FRA_FWMARK, rule->fwmark);
 537                 if (r < 0)
 538                         return log_error_errno(r, "Could not append FRA_FWMARK attribute: %m");
 539         }
 540
 541         if (rule->fwmask > 0) {
 542                 r = sd_netlink_message_append_u32(m, FRA_FWMASK, rule->fwmask);
 543                 if (r < 0)
 544                         return log_error_errno(r, "Could not append FRA_FWMASK attribute: %m");
 545         }
 546
 547         if (rule->iif) {
 548                 r = sd_netlink_message_append_string(m, FRA_IFNAME, rule->iif);
 549                 if (r < 0)
 550                         return log_error_errno(r, "Could not append FRA_IFNAME attribute: %m");
 551         }
 552
 553         if (rule->oif) {
 554                 r = sd_netlink_message_append_string(m, FRA_OIFNAME, rule->oif);
 555                 if (r < 0)
 556                         return log_error_errno(r, "Could not append FRA_OIFNAME attribute: %m");
 557         }
 558
 559         r = sd_netlink_message_append_u8(m, FRA_IP_PROTO, rule->protocol);
 560         if (r < 0)
 561                 return log_error_errno(r, "Could not append FRA_IP_PROTO attribute: %m");
 562
 563         if (rule->sport.start != 0 || rule->sport.end != 0) {
 564                 r = sd_netlink_message_append_data(m, FRA_SPORT_RANGE, &rule->sport, sizeof(rule->sport));
 565                 if (r < 0)
 566                         return log_error_errno(r, "Could not append FRA_SPORT_RANGE attribute: %m");
 567         }
 568
 569         if (rule->dport.start != 0 || rule->dport.end != 0) {
 570                 r = sd_netlink_message_append_data(m, FRA_DPORT_RANGE, &rule->dport, sizeof(rule->dport));
 571                 if (r < 0)
 572                         return log_error_errno(r, "Could not append FRA_DPORT_RANGE attribute: %m");
 573         }
 574
 575         if (rule->invert_rule) {
 576                 r = sd_rtnl_message_routing_policy_rule_set_flags(m, FIB_RULE_INVERT);
 577                 if (r < 0)
 578                         return log_error_errno(r, "Could not append FIB_RULE_INVERT attribute: %m");
 579         }
 580
 581         rule->link = link;
 582
 583         r = netlink_call_async(link->manager->rtnl, NULL, m,
 584                                callback ?: routing_policy_rule_handler,
 585                                link_netlink_destroy_callback, link);
 586         if (r < 0)
 587                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 588
 589         link_ref(link);
 590
 591         r = routing_policy_rule_add(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
 592                                     rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif, rule->protocol, &rule->sport, &rule->dport, NULL);
 593         if (r < 0)
 594                 return log_error_errno(r, "Could not add rule: %m");
 595
 596         return 0;
 597 }
 598
 599 static int parse_fwmark_fwmask(const char *s, uint32_t *fwmark, uint32_t *fwmask) {
 600         _cleanup_free_ char *f = NULL;
 601         char *p;
 602         int r;
 603
 604         assert(s);
 605
 606         f = strdup(s);
 607         if (!f)
 608                 return -ENOMEM;
 609
 610         p = strchr(f, '/');
 611         if (p)
 612                 *p++ = '\0';
 613
 614         r = safe_atou32(f, fwmark);
 615         if (r < 0)
 616                 return log_error_errno(r, "Failed to parse RPDB rule firewall mark, ignoring: %s", f);
 617
 618         if (p) {
 619                 r = safe_atou32(p, fwmask);
 620                 if (r < 0)
 621                         return log_error_errno(r, "Failed to parse RPDB rule mask, ignoring: %s", f);
 622         }
 623
 624         return 0;
 625 }
 626
 627 int config_parse_routing_policy_rule_tos(
 628                 const char *unit,
 629                 const char *filename,
 630                 unsigned line,
 631                 const char *section,
 632                 unsigned section_line,
 633                 const char *lvalue,
 634                 int ltype,
 635                 const char *rvalue,
 636                 void *data,
 637                 void *userdata) {
 638
 639         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 640         Network *network = userdata;
 641         int r;
 642
 643         assert(filename);
 644         assert(section);
 645         assert(lvalue);
 646         assert(rvalue);
 647         assert(data);
 648
 649         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 650         if (r < 0)
 651                 return r;
 652
 653         r = safe_atou8(rvalue, &n->tos);
 654         if (r < 0) {
 655                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse RPDB rule tos, ignoring: %s", rvalue);
 656                 return 0;
 657         }
 658
 659         n = NULL;
 660
 661         return 0;
 662 }
 663
 664 int config_parse_routing_policy_rule_priority(
 665                 const char *unit,
 666                 const char *filename,
 667                 unsigned line,
 668                 const char *section,
 669                 unsigned section_line,
 670                 const char *lvalue,
 671                 int ltype,
 672                 const char *rvalue,
 673                 void *data,
 674                 void *userdata) {
 675
 676         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 677         Network *network = userdata;
 678         int r;
 679
 680         assert(filename);
 681         assert(section);
 682         assert(lvalue);
 683         assert(rvalue);
 684         assert(data);
 685
 686         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 687         if (r < 0)
 688                 return r;
 689
 690         r = safe_atou32(rvalue, &n->priority);
 691         if (r < 0) {
 692                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse RPDB rule priority, ignoring: %s", rvalue);
 693                 return 0;
 694         }
 695
 696         n = NULL;
 697
 698         return 0;
 699 }
 700
 701 int config_parse_routing_policy_rule_table(
 702                 const char *unit,
 703                 const char *filename,
 704                 unsigned line,
 705                 const char *section,
 706                 unsigned section_line,
 707                 const char *lvalue,
 708                 int ltype,
 709                 const char *rvalue,
 710                 void *data,
 711                 void *userdata) {
 712
 713         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 714         Network *network = userdata;
 715         int r;
 716
 717         assert(filename);
 718         assert(section);
 719         assert(lvalue);
 720         assert(rvalue);
 721         assert(data);
 722
 723         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 724         if (r < 0)
 725                 return r;
 726
 727         r = safe_atou32(rvalue, &n->table);
 728         if (r < 0) {
 729                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse RPDB rule table, ignoring: %s", rvalue);
 730                 return 0;
 731         }
 732
 733         n = NULL;
 734
 735         return 0;
 736 }
 737
 738 int config_parse_routing_policy_rule_fwmark_mask(
 739                 const char *unit,
 740                 const char *filename,
 741                 unsigned line,
 742                 const char *section,
 743                 unsigned section_line,
 744                 const char *lvalue,
 745                 int ltype,
 746                 const char *rvalue,
 747                 void *data,
 748                 void *userdata) {
 749
 750         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 751         Network *network = userdata;
 752         int r;
 753
 754         assert(filename);
 755         assert(section);
 756         assert(lvalue);
 757         assert(rvalue);
 758         assert(data);
 759
 760         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 761         if (r < 0)
 762                 return r;
 763
 764         r = parse_fwmark_fwmask(rvalue, &n->fwmark, &n->fwmask);
 765         if (r < 0) {
 766                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse RPDB rule firewall mark or mask, ignoring: %s", rvalue);
 767                 return 0;
 768         }
 769
 770         n = NULL;
 771
 772         return 0;
 773 }
 774
 775 int config_parse_routing_policy_rule_prefix(
 776                 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
 787         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 788         Network *network = userdata;
 789         union in_addr_union *buffer;
 790         uint8_t *prefixlen;
 791         int r;
 792
 793         assert(filename);
 794         assert(section);
 795         assert(lvalue);
 796         assert(rvalue);
 797         assert(data);
 798
 799         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 800         if (r < 0)
 801                 return r;
 802
 803         if (streq(lvalue, "To")) {
 804                 buffer = &n->to;
 805                 prefixlen = &n->to_prefixlen;
 806         } else {
 807                 buffer = &n->from;
 808                 prefixlen = &n->from_prefixlen;
 809         }
 810
 811         r = in_addr_prefix_from_string_auto(rvalue, &n->family, buffer, prefixlen);
 812         if (r < 0) {
 813                 log_syntax(unit, LOG_ERR, filename, line, r, "RPDB rule prefix is invalid, ignoring assignment: %s", rvalue);
 814                 return 0;
 815         }
 816
 817         n = NULL;
 818
 819         return 0;
 820 }
 821
 822 int config_parse_routing_policy_rule_device(
 823                 const char *unit,
 824                 const char *filename,
 825                 unsigned line,
 826                 const char *section,
 827                 unsigned section_line,
 828                 const char *lvalue,
 829                 int ltype,
 830                 const char *rvalue,
 831                 void *data,
 832                 void *userdata) {
 833
 834         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 835         Network *network = userdata;
 836         int r;
 837
 838         assert(filename);
 839         assert(section);
 840         assert(lvalue);
 841         assert(rvalue);
 842         assert(data);
 843
 844         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 845         if (r < 0)
 846                 return r;
 847
 848         if (!ifname_valid(rvalue)) {
 849                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse '%s' interface name, ignoring: %s", lvalue, rvalue);
 850                 return 0;
 851         }
 852
 853         if (streq(lvalue, "IncomingInterface")) {
 854                 r = free_and_strdup(&n->iif, rvalue);
 855                 if (r < 0)
 856                         return log_oom();
 857         } else {
 858                 r = free_and_strdup(&n->oif, rvalue);
 859                 if (r < 0)
 860                         return log_oom();
 861         }
 862
 863         n = NULL;
 864
 865         return 0;
 866 }
 867
 868 int config_parse_routing_policy_rule_port_range(
 869                 const char *unit,
 870                 const char *filename,
 871                 unsigned line,
 872                 const char *section,
 873                 unsigned section_line,
 874                 const char *lvalue,
 875                 int ltype,
 876                 const char *rvalue,
 877                 void *data,
 878                 void *userdata) {
 879         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 880         Network *network = userdata;
 881         uint16_t low, high;
 882         int r;
 883
 884         assert(filename);
 885         assert(section);
 886         assert(lvalue);
 887         assert(rvalue);
 888         assert(data);
 889
 890         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 891         if (r < 0)
 892                 return r;
 893
 894         r = parse_ip_port_range(rvalue, &low, &high);
 895         if (r < 0) {
 896                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse routing policy rule port range '%s'", rvalue);
 897                 return 0;
 898         }
 899
 900         if (streq(lvalue, "SourcePort")) {
 901                 n->sport.start = low;
 902                 n->sport.end = high;
 903         } else {
 904                 n->dport.start = low;
 905                 n->dport.end = high;
 906         }
 907
 908         n = NULL;
 909
 910         return 0;
 911 }
 912
 913 int config_parse_routing_policy_rule_ip_protocol(
 914                 const char *unit,
 915                 const char *filename,
 916                 unsigned line,
 917                 const char *section,
 918                 unsigned section_line,
 919                 const char *lvalue,
 920                 int ltype,
 921                 const char *rvalue,
 922                 void *data,
 923                 void *userdata) {
 924
 925         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 926         Network *network = userdata;
 927         int r;
 928
 929         assert(filename);
 930         assert(section);
 931         assert(lvalue);
 932         assert(rvalue);
 933         assert(data);
 934
 935         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 936         if (r < 0)
 937                 return r;
 938
 939         r = parse_ip_protocol(rvalue);
 940         if (r < 0) {
 941                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse IP protocol '%s' for routing policy rule, ignoring: %m", rvalue);
 942                 return 0;
 943         }
 944
 945         n->protocol = r;
 946
 947         n = NULL;
 948
 949         return 0;
 950 }
 951
 952 int config_parse_routing_policy_rule_invert(
 953                 const char *unit,
 954                 const char *filename,
 955                 unsigned line,
 956                 const char *section,
 957                 unsigned section_line,
 958                 const char *lvalue,
 959                 int ltype,
 960                 const char *rvalue,
 961                 void *data,
 962                 void *userdata) {
 963
 964         _cleanup_(routing_policy_rule_free_or_set_invalidp) RoutingPolicyRule *n = NULL;
 965         Network *network = userdata;
 966         int r;
 967
 968         assert(filename);
 969         assert(section);
 970         assert(lvalue);
 971         assert(rvalue);
 972         assert(data);
 973
 974         r = routing_policy_rule_new_static(network, filename, section_line, &n);
 975         if (r < 0)
 976                 return r;
 977
 978         r = parse_boolean(rvalue);
 979         if (r < 0) {
 980                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse RPDB rule invert, ignoring: %s", rvalue);
 981                 return 0;
 982         }
 983
 984         n->invert_rule = r;
 985
 986         n = NULL;
 987
 988         return 0;
 989 }
 990
 991 static int routing_policy_rule_read_full_file(const char *state_file, char **ret) {
 992         _cleanup_free_ char *s = NULL;
 993         size_t size;
 994         int r;
 995
 996         assert(state_file);
 997
 998         r = read_full_file(state_file, &s, &size);
 999         if (r == -ENOENT)
1000                 return -ENODATA;
1001         if (r < 0)
1002                 return r;
1003         if (size <= 0)
1004                 return -ENODATA;
1005
1006         *ret = TAKE_PTR(s);
1007
1008         return size;
1009 }
1010
1011 int routing_policy_serialize_rules(Set *rules, FILE *f) {
1012         RoutingPolicyRule *rule = NULL;
1013         Iterator i;
1014         int r;
1015
1016         assert(f);
1017
1018         SET_FOREACH(rule, rules, i) {
1019                 _cleanup_free_ char *from_str = NULL, *to_str = NULL;
1020                 bool space = false;
1021
1022                 fputs("RULE=", f);
1023
1024                 if (!in_addr_is_null(rule->family, &rule->from)) {
1025                         r = in_addr_to_string(rule->family, &rule->from, &from_str);
1026                         if (r < 0)
1027                                 return r;
1028
1029                         fprintf(f, "from=%s/%hhu",
1030                                 from_str, rule->from_prefixlen);
1031                         space = true;
1032                 }
1033
1034                 if (!in_addr_is_null(rule->family, &rule->to)) {
1035                         r = in_addr_to_string(rule->family, &rule->to, &to_str);
1036                         if (r < 0)
1037                                 return r;
1038
1039                         fprintf(f, "%sto=%s/%hhu",
1040                                 space ? " " : "",
1041                                 to_str, rule->to_prefixlen);
1042                         space = true;
1043                 }
1044
1045                 if (rule->tos != 0) {
1046                         fprintf(f, "%stos=%hhu",
1047                                 space ? " " : "",
1048                                 rule->tos);
1049                         space = true;
1050                 }
1051
1052                 if (rule->fwmark != 0) {
1053                         fprintf(f, "%sfwmark=%"PRIu32"/%"PRIu32,
1054                                 space ? " " : "",
1055                                 rule->fwmark, rule->fwmask);
1056                         space = true;
1057                 }
1058
1059                 if (rule->iif) {
1060                         fprintf(f, "%siif=%s",
1061                                 space ? " " : "",
1062                                 rule->iif);
1063                         space = true;
1064                 }
1065
1066                 if (rule->oif) {
1067                         fprintf(f, "%soif=%s",
1068                                 space ? " " : "",
1069                                 rule->oif);
1070                         space = true;
1071                 }
1072
1073                 if (rule->protocol != 0) {
1074                         fprintf(f, "%sprotocol=%hhu",
1075                                 space ? " " : "",
1076                                 rule->protocol);
1077                         space = true;
1078                 }
1079
1080                 if (rule->sport.start != 0 || rule->sport.end != 0) {
1081                         fprintf(f, "%ssourcesport=%"PRIu16"-%"PRIu16,
1082                                 space ? " " : "",
1083                                 rule->sport.start, rule->sport.end);
1084                         space = true;
1085                 }
1086
1087                 if (rule->dport.start != 0 || rule->dport.end != 0) {
1088                         fprintf(f, "%sdestinationport=%"PRIu16"-%"PRIu16,
1089                                 space ? " " : "",
1090                                 rule->dport.start, rule->dport.end);
1091                         space = true;
1092                 }
1093
1094                 fprintf(f, "%stable=%"PRIu32 "\n",
1095                         space ? " " : "",
1096                         rule->table);
1097         }
1098
1099         return 0;
1100 }
1101
1102 int routing_policy_load_rules(const char *state_file, Set **rules) {
1103         _cleanup_strv_free_ char **l = NULL;
1104         _cleanup_free_ char *data = NULL;
1105         uint16_t low = 0, high = 0;
1106         const char *p;
1107         char **i;
1108         int r;
1109
1110         assert(state_file);
1111         assert(rules);
1112
1113         r = routing_policy_rule_read_full_file(state_file, &data);
1114         if (r <= 0)
1115                 return r;
1116
1117         l = strv_split_newlines(data);
1118         if (!l)
1119                 return -ENOMEM;
1120
1121         r = set_ensure_allocated(rules, &routing_policy_rule_hash_ops);
1122         if (r < 0)
1123                 return r;
1124
1125         STRV_FOREACH(i, l) {
1126                 _cleanup_(routing_policy_rule_freep) RoutingPolicyRule *rule = NULL;
1127
1128                 p = startswith(*i, "RULE=");
1129                 if (!p)
1130                         continue;
1131
1132                 r = routing_policy_rule_new(&rule);
1133                 if (r < 0)
1134                         return r;
1135
1136                 for (;;) {
1137                         _cleanup_free_ char *word = NULL, *a = NULL, *b = NULL;
1138
1139                         r = extract_first_word(&p, &word, NULL, 0);
1140                         if (r < 0)
1141                                 return r;
1142                         if (r == 0)
1143                                 break;
1144
1145                         r = split_pair(word, "=", &a, &b);
1146                         if (r < 0)
1147                                 continue;
1148
1149                         if (STR_IN_SET(a, "from", "to")) {
1150                                 union in_addr_union *buffer;
1151                                 uint8_t *prefixlen;
1152
1153                                 if (streq(a, "to")) {
1154                                         buffer = &rule->to;
1155                                         prefixlen = &rule->to_prefixlen;
1156                                 } else {
1157                                         buffer = &rule->from;
1158                                         prefixlen = &rule->from_prefixlen;
1159                                 }
1160
1161                                 r = in_addr_prefix_from_string_auto(b, &rule->family, buffer, prefixlen);
1162                                 if (r < 0) {
1163                                         log_error_errno(r, "RPDB rule prefix is invalid, ignoring assignment: %s", b);
1164                                         continue;
1165                                 }
1166
1167                         } else if (streq(a, "tos")) {
1168                                 r = safe_atou8(b, &rule->tos);
1169                                 if (r < 0) {
1170                                         log_error_errno(r, "Failed to parse RPDB rule tos, ignoring: %s", b);
1171                                         continue;
1172                                 }
1173                         } else if (streq(a, "table")) {
1174                                 r = safe_atou32(b, &rule->table);
1175                                 if (r < 0) {
1176                                         log_error_errno(r, "Failed to parse RPDB rule table, ignoring: %s", b);
1177                                         continue;
1178                                 }
1179                         } else if (streq(a, "fwmark")) {
1180
1181                                 r = parse_fwmark_fwmask(b, &rule->fwmark, &rule->fwmask);
1182                                 if (r < 0) {
1183                                         log_error_errno(r, "Failed to parse RPDB rule firewall mark or mask, ignoring: %s", a);
1184                                         continue;
1185                                 }
1186                         } else if (streq(a, "iif")) {
1187
1188                                 if (free_and_strdup(&rule->iif, b) < 0)
1189                                         return log_oom();
1190
1191                         } else if (streq(a, "oif")) {
1192
1193                                 if (free_and_strdup(&rule->oif, b) < 0)
1194                                         return log_oom();
1195                         } else if (streq(a, "protocol")) {
1196                                 r = safe_atou8(b, &rule->protocol);
1197                                 if (r < 0) {
1198                                         log_error_errno(r, "Failed to parse RPDB rule protocol, ignoring: %s", b);
1199                                         continue;
1200                                 }
1201                         } else if (streq(a, "sourceport")) {
1202
1203                                 r = parse_ip_port_range(b, &low, &high);
1204                                 if (r < 0) {
1205                                         log_error_errno(r, "Invalid routing policy rule source port range, ignoring assignment:'%s'", b);
1206                                         continue;
1207                                 }
1208
1209                                 rule->sport.start = low;
1210                                 rule->sport.end = high;
1211
1212                         } else if (streq(a, "destinationport")) {
1213
1214                                 r = parse_ip_port_range(b, &low, &high);
1215                                 if (r < 0) {
1216                                         log_error_errno(r, "Invalid routing policy rule destination port range, ignoring assignment:'%s'", b);
1217                                         continue;
1218                                 }
1219
1220                                 rule->dport.start = low;
1221                                 rule->dport.end = high;
1222                         }
1223                 }
1224
1225                 r = set_put(*rules, rule);
1226                 if (r < 0) {
1227                         log_warning_errno(r, "Failed to add RPDB rule to saved DB, ignoring: %s", p);
1228                         continue;
1229                 }
1230
1231                 rule = NULL;
1232         }
1233
1234         return 0;
1235 }
1236
1237 static bool manager_links_have_routing_policy_rule(Manager *m, RoutingPolicyRule *rule) {
1238         RoutingPolicyRule *link_rule;
1239         Iterator i;
1240         Link *link;
1241
1242         assert(m);
1243         assert(rule);
1244
1245         HASHMAP_FOREACH(link, m->links, i) {
1246                 if (!link->network)
1247                         continue;
1248
1249                 LIST_FOREACH(rules, link_rule, link->network->rules)
1250                         if (routing_policy_rule_compare_func(link_rule, rule) == 0)
1251                                 return true;
1252         }
1253
1254         return false;
1255 }
1256
1257 void routing_policy_rule_purge(Manager *m, Link *link) {
1258         RoutingPolicyRule *rule, *existing;
1259         Iterator i;
1260         int r;
1261
1262         assert(m);
1263         assert(link);
1264
1265         SET_FOREACH(rule, m->rules_saved, i) {
1266                 existing = set_get(m->rules_foreign, rule);
1267                 if (!existing)
1268                         continue; /* Saved rule does not exist anymore. */
1269
1270                 if (manager_links_have_routing_policy_rule(m, existing))
1271                         continue; /* Existing links have the saved rule. */
1272
1273                 /* Existing links do not have the saved rule. Let's drop the rule now, and re-configure it
1274                  * later when it is requested. */
1275
1276                 r = routing_policy_rule_remove(existing, link, NULL);
1277                 if (r < 0) {
1278                         log_warning_errno(r, "Could not remove routing policy rules: %m");
1279                         continue;
1280                 }
1281
1282                 link->routing_policy_rule_remove_messages++;
1283
1284                 assert_se(set_remove(m->rules_foreign, existing) == existing);
1285                 routing_policy_rule_free(existing);
1286         }
1287 }