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 "netlink-util.h"
   9 #include "networkd-manager.h"
  10 #include "networkd-route.h"
  11 #include "parse-util.h"
  12 #include "set.h"
  13 #include "string-util.h"
  14 #include "sysctl-util.h"
  15 #include "util.h"
  16
  17 #define ROUTES_DEFAULT_MAX_PER_FAMILY 4096U
  18
  19 static unsigned routes_max(void) {
  20         static thread_local unsigned cached = 0;
  21
  22         _cleanup_free_ char *s4 = NULL, *s6 = NULL;
  23         unsigned val4 = ROUTES_DEFAULT_MAX_PER_FAMILY, val6 = ROUTES_DEFAULT_MAX_PER_FAMILY;
  24
  25         if (cached > 0)
  26                 return cached;
  27
  28         if (sysctl_read("net/ipv4/route/max_size", &s4) >= 0) {
  29                 truncate_nl(s4);
  30                 if (safe_atou(s4, &val4) >= 0 &&
  31                     val4 == 2147483647U)
  32                         /* This is the default "no limit" value in the kernel */
  33                         val4 = ROUTES_DEFAULT_MAX_PER_FAMILY;
  34         }
  35
  36         if (sysctl_read("net/ipv6/route/max_size", &s6) >= 0) {
  37                 truncate_nl(s6);
  38                 (void) safe_atou(s6, &val6);
  39         }
  40
  41         cached = MAX(ROUTES_DEFAULT_MAX_PER_FAMILY, val4) +
  42                  MAX(ROUTES_DEFAULT_MAX_PER_FAMILY, val6);
  43         return cached;
  44 }
  45
  46 int route_new(Route **ret) {
  47         _cleanup_(route_freep) Route *route = NULL;
  48
  49         route = new0(Route, 1);
  50         if (!route)
  51                 return -ENOMEM;
  52
  53         route->family = AF_UNSPEC;
  54         route->scope = RT_SCOPE_UNIVERSE;
  55         route->protocol = RTPROT_UNSPEC;
  56         route->type = RTN_UNICAST;
  57         route->table = RT_TABLE_MAIN;
  58         route->lifetime = USEC_INFINITY;
  59         route->quickack = -1;
  60
  61         *ret = TAKE_PTR(route);
  62
  63         return 0;
  64 }
  65
  66 int route_new_static(Network *network, const char *filename, unsigned section_line, Route **ret) {
  67         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  68         _cleanup_(route_freep) Route *route = NULL;
  69         int r;
  70
  71         assert(network);
  72         assert(ret);
  73         assert(!!filename == (section_line > 0));
  74
  75         if (filename) {
  76                 r = network_config_section_new(filename, section_line, &n);
  77                 if (r < 0)
  78                         return r;
  79
  80                 route = hashmap_get(network->routes_by_section, n);
  81                 if (route) {
  82                         *ret = TAKE_PTR(route);
  83
  84                         return 0;
  85                 }
  86         }
  87
  88         if (network->n_static_routes >= routes_max())
  89                 return -E2BIG;
  90
  91         r = route_new(&route);
  92         if (r < 0)
  93                 return r;
  94
  95         route->protocol = RTPROT_STATIC;
  96
  97         if (filename) {
  98                 route->section = TAKE_PTR(n);
  99
 100                 r = hashmap_put(network->routes_by_section, route->section, route);
 101                 if (r < 0)
 102                         return r;
 103         }
 104
 105         route->network = network;
 106         LIST_PREPEND(routes, network->static_routes, route);
 107         network->n_static_routes++;
 108
 109         *ret = TAKE_PTR(route);
 110
 111         return 0;
 112 }
 113
 114 void route_free(Route *route) {
 115         if (!route)
 116                 return;
 117
 118         if (route->network) {
 119                 LIST_REMOVE(routes, route->network->static_routes, route);
 120
 121                 assert(route->network->n_static_routes > 0);
 122                 route->network->n_static_routes--;
 123
 124                 if (route->section)
 125                         hashmap_remove(route->network->routes_by_section, route->section);
 126         }
 127
 128         network_config_section_free(route->section);
 129
 130         if (route->link) {
 131                 set_remove(route->link->routes, route);
 132                 set_remove(route->link->routes_foreign, route);
 133         }
 134
 135         sd_event_source_unref(route->expire);
 136
 137         free(route);
 138 }
 139
 140 static void route_hash_func(const void *b, struct siphash *state) {
 141         const Route *route = b;
 142
 143         assert(route);
 144
 145         siphash24_compress(&route->family, sizeof(route->family), state);
 146
 147         switch (route->family) {
 148         case AF_INET:
 149         case AF_INET6:
 150                 /* Equality of routes are given by the 4-touple
 151                    (dst_prefix,dst_prefixlen,tos,priority,table) */
 152                 siphash24_compress(&route->dst, FAMILY_ADDRESS_SIZE(route->family), state);
 153                 siphash24_compress(&route->dst_prefixlen, sizeof(route->dst_prefixlen), state);
 154                 siphash24_compress(&route->tos, sizeof(route->tos), state);
 155                 siphash24_compress(&route->priority, sizeof(route->priority), state);
 156                 siphash24_compress(&route->table, sizeof(route->table), state);
 157
 158                 break;
 159         default:
 160                 /* treat any other address family as AF_UNSPEC */
 161                 break;
 162         }
 163 }
 164
 165 static int route_compare_func(const void *_a, const void *_b) {
 166         const Route *a = _a, *b = _b;
 167         int r;
 168
 169         r = CMP(a->family, b->family);
 170         if (r != 0)
 171                 return r;
 172
 173         switch (a->family) {
 174         case AF_INET:
 175         case AF_INET6:
 176                 r = CMP(a->dst_prefixlen, b->dst_prefixlen);
 177                 if (r != 0)
 178                         return r;
 179
 180                 r = CMP(a->tos, b->tos);
 181                 if (r != 0)
 182                         return r;
 183
 184                 r = CMP(a->priority, b->priority);
 185                 if (r != 0)
 186                         return r;
 187
 188                 r = CMP(a->table, b->table);
 189                 if (r != 0)
 190                         return r;
 191
 192                 return memcmp(&a->dst, &b->dst, FAMILY_ADDRESS_SIZE(a->family));
 193         default:
 194                 /* treat any other address family as AF_UNSPEC */
 195                 return 0;
 196         }
 197 }
 198
 199 static const struct hash_ops route_hash_ops = {
 200         .hash = route_hash_func,
 201         .compare = route_compare_func
 202 };
 203
 204 int route_get(Link *link,
 205               int family,
 206               const union in_addr_union *dst,
 207               unsigned char dst_prefixlen,
 208               unsigned char tos,
 209               uint32_t priority,
 210               uint32_t table,
 211               Route **ret) {
 212
 213         Route route, *existing;
 214
 215         assert(link);
 216         assert(dst);
 217
 218         route = (Route) {
 219                 .family = family,
 220                 .dst = *dst,
 221                 .dst_prefixlen = dst_prefixlen,
 222                 .tos = tos,
 223                 .priority = priority,
 224                 .table = table,
 225         };
 226
 227         existing = set_get(link->routes, &route);
 228         if (existing) {
 229                 if (ret)
 230                         *ret = existing;
 231                 return 1;
 232         }
 233
 234         existing = set_get(link->routes_foreign, &route);
 235         if (existing) {
 236                 if (ret)
 237                         *ret = existing;
 238                 return 0;
 239         }
 240
 241         return -ENOENT;
 242 }
 243
 244 static int route_add_internal(
 245                 Link *link,
 246                 Set **routes,
 247                 int family,
 248                 const union in_addr_union *dst,
 249                 unsigned char dst_prefixlen,
 250                 unsigned char tos,
 251                 uint32_t priority,
 252                 uint32_t table,
 253                 Route **ret) {
 254
 255         _cleanup_(route_freep) Route *route = NULL;
 256         int r;
 257
 258         assert(link);
 259         assert(routes);
 260         assert(dst);
 261
 262         r = route_new(&route);
 263         if (r < 0)
 264                 return r;
 265
 266         route->family = family;
 267         route->dst = *dst;
 268         route->dst_prefixlen = dst_prefixlen;
 269         route->tos = tos;
 270         route->priority = priority;
 271         route->table = table;
 272
 273         r = set_ensure_allocated(routes, &route_hash_ops);
 274         if (r < 0)
 275                 return r;
 276
 277         r = set_put(*routes, route);
 278         if (r < 0)
 279                 return r;
 280
 281         route->link = link;
 282
 283         if (ret)
 284                 *ret = route;
 285
 286         route = NULL;
 287
 288         return 0;
 289 }
 290
 291 int route_add_foreign(
 292                 Link *link,
 293                 int family,
 294                 const union in_addr_union *dst,
 295                 unsigned char dst_prefixlen,
 296                 unsigned char tos,
 297                 uint32_t priority,
 298                 uint32_t table,
 299                 Route **ret) {
 300
 301         return route_add_internal(link, &link->routes_foreign, family, dst, dst_prefixlen, tos, priority, table, ret);
 302 }
 303
 304 int route_add(Link *link,
 305               int family,
 306               const union in_addr_union *dst,
 307               unsigned char dst_prefixlen,
 308               unsigned char tos,
 309               uint32_t priority,
 310               uint32_t table,
 311               Route **ret) {
 312
 313         Route *route;
 314         int r;
 315
 316         r = route_get(link, family, dst, dst_prefixlen, tos, priority, table, &route);
 317         if (r == -ENOENT) {
 318                 /* Route does not exist, create a new one */
 319                 r = route_add_internal(link, &link->routes, family, dst, dst_prefixlen, tos, priority, table, &route);
 320                 if (r < 0)
 321                         return r;
 322         } else if (r == 0) {
 323                 /* Take over a foreign route */
 324                 r = set_ensure_allocated(&link->routes, &route_hash_ops);
 325                 if (r < 0)
 326                         return r;
 327
 328                 r = set_put(link->routes, route);
 329                 if (r < 0)
 330                         return r;
 331
 332                 set_remove(link->routes_foreign, route);
 333         } else if (r == 1) {
 334                 /* Route exists, do nothing */
 335                 ;
 336         } else
 337                 return r;
 338
 339         if (ret)
 340                 *ret = route;
 341
 342         return 0;
 343 }
 344
 345 void route_update(Route *route,
 346                   const union in_addr_union *src,
 347                   unsigned char src_prefixlen,
 348                   const union in_addr_union *gw,
 349                   const union in_addr_union *prefsrc,
 350                   unsigned char scope,
 351                   unsigned char protocol,
 352                   unsigned char type) {
 353
 354         assert(route);
 355         assert(src || src_prefixlen == 0);
 356
 357         route->src = src ? *src : (union in_addr_union) {};
 358         route->src_prefixlen = src_prefixlen;
 359         route->gw = gw ? *gw : (union in_addr_union) {};
 360         route->prefsrc = prefsrc ? *prefsrc : (union in_addr_union) {};
 361         route->scope = scope;
 362         route->protocol = protocol;
 363         route->type = type;
 364 }
 365
 366 int route_remove(Route *route, Link *link,
 367                  sd_netlink_message_handler_t callback) {
 368
 369         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 370         int r;
 371
 372         assert(link);
 373         assert(link->manager);
 374         assert(link->manager->rtnl);
 375         assert(link->ifindex > 0);
 376         assert(IN_SET(route->family, AF_INET, AF_INET6));
 377
 378         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
 379                                       RTM_DELROUTE, route->family,
 380                                       route->protocol);
 381         if (r < 0)
 382                 return log_error_errno(r, "Could not create RTM_DELROUTE message: %m");
 383
 384         if (!in_addr_is_null(route->family, &route->gw)) {
 385                 if (route->family == AF_INET)
 386                         r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &route->gw.in);
 387                 else if (route->family == AF_INET6)
 388                         r = sd_netlink_message_append_in6_addr(req, RTA_GATEWAY, &route->gw.in6);
 389                 if (r < 0)
 390                         return log_error_errno(r, "Could not append RTA_GATEWAY attribute: %m");
 391         }
 392
 393         if (route->dst_prefixlen) {
 394                 if (route->family == AF_INET)
 395                         r = sd_netlink_message_append_in_addr(req, RTA_DST, &route->dst.in);
 396                 else if (route->family == AF_INET6)
 397                         r = sd_netlink_message_append_in6_addr(req, RTA_DST, &route->dst.in6);
 398                 if (r < 0)
 399                         return log_error_errno(r, "Could not append RTA_DST attribute: %m");
 400
 401                 r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
 402                 if (r < 0)
 403                         return log_error_errno(r, "Could not set destination prefix length: %m");
 404         }
 405
 406         if (route->src_prefixlen) {
 407                 if (route->family == AF_INET)
 408                         r = sd_netlink_message_append_in_addr(req, RTA_SRC, &route->src.in);
 409                 else if (route->family == AF_INET6)
 410                         r = sd_netlink_message_append_in6_addr(req, RTA_SRC, &route->src.in6);
 411                 if (r < 0)
 412                         return log_error_errno(r, "Could not append RTA_SRC attribute: %m");
 413
 414                 r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
 415                 if (r < 0)
 416                         return log_error_errno(r, "Could not set source prefix length: %m");
 417         }
 418
 419         if (!in_addr_is_null(route->family, &route->prefsrc)) {
 420                 if (route->family == AF_INET)
 421                         r = sd_netlink_message_append_in_addr(req, RTA_PREFSRC, &route->prefsrc.in);
 422                 else if (route->family == AF_INET6)
 423                         r = sd_netlink_message_append_in6_addr(req, RTA_PREFSRC, &route->prefsrc.in6);
 424                 if (r < 0)
 425                         return log_error_errno(r, "Could not append RTA_PREFSRC attribute: %m");
 426         }
 427
 428         r = sd_rtnl_message_route_set_scope(req, route->scope);
 429         if (r < 0)
 430                 return log_error_errno(r, "Could not set scope: %m");
 431
 432         r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
 433         if (r < 0)
 434                 return log_error_errno(r, "Could not append RTA_PRIORITY attribute: %m");
 435
 436         if (!IN_SET(route->type, RTN_UNREACHABLE, RTN_PROHIBIT, RTN_BLACKHOLE)) {
 437                 r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
 438                 if (r < 0)
 439                         return log_error_errno(r, "Could not append RTA_OIF attribute: %m");
 440         }
 441
 442         r = sd_netlink_call_async(link->manager->rtnl, req, callback,
 443                                   link_netlink_destroy_callback, link, 0, NULL);
 444         if (r < 0)
 445                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 446
 447         link_ref(link);
 448
 449         return 0;
 450 }
 451
 452 int route_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) {
 453         Route *route = userdata;
 454         int r;
 455
 456         assert(route);
 457
 458         r = route_remove(route, route->link, link_route_remove_handler);
 459         if (r < 0)
 460                 log_warning_errno(r, "Could not remove route: %m");
 461         else
 462                 route_free(route);
 463
 464         return 1;
 465 }
 466
 467 int route_configure(
 468                 Route *route,
 469                 Link *link,
 470                 sd_netlink_message_handler_t callback) {
 471
 472         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 473         _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
 474         usec_t lifetime;
 475         int r;
 476
 477         assert(link);
 478         assert(link->manager);
 479         assert(link->manager->rtnl);
 480         assert(link->ifindex > 0);
 481         assert(IN_SET(route->family, AF_INET, AF_INET6));
 482
 483         if (route_get(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL) <= 0 &&
 484             set_size(link->routes) >= routes_max())
 485                 return -E2BIG;
 486
 487         r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
 488                                       RTM_NEWROUTE, route->family,
 489                                       route->protocol);
 490         if (r < 0)
 491                 return log_error_errno(r, "Could not create RTM_NEWROUTE message: %m");
 492
 493         if (!in_addr_is_null(route->family, &route->gw)) {
 494                 if (route->family == AF_INET)
 495                         r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &route->gw.in);
 496                 else if (route->family == AF_INET6)
 497                         r = sd_netlink_message_append_in6_addr(req, RTA_GATEWAY, &route->gw.in6);
 498                 if (r < 0)
 499                         return log_error_errno(r, "Could not append RTA_GATEWAY attribute: %m");
 500
 501                 r = sd_rtnl_message_route_set_family(req, route->family);
 502                 if (r < 0)
 503                         return log_error_errno(r, "Could not set route family: %m");
 504         }
 505
 506         if (route->dst_prefixlen) {
 507                 if (route->family == AF_INET)
 508                         r = sd_netlink_message_append_in_addr(req, RTA_DST, &route->dst.in);
 509                 else if (route->family == AF_INET6)
 510                         r = sd_netlink_message_append_in6_addr(req, RTA_DST, &route->dst.in6);
 511                 if (r < 0)
 512                         return log_error_errno(r, "Could not append RTA_DST attribute: %m");
 513
 514                 r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
 515                 if (r < 0)
 516                         return log_error_errno(r, "Could not set destination prefix length: %m");
 517         }
 518
 519         if (route->src_prefixlen) {
 520                 if (route->family == AF_INET)
 521                         r = sd_netlink_message_append_in_addr(req, RTA_SRC, &route->src.in);
 522                 else if (route->family == AF_INET6)
 523                         r = sd_netlink_message_append_in6_addr(req, RTA_SRC, &route->src.in6);
 524                 if (r < 0)
 525                         return log_error_errno(r, "Could not append RTA_SRC attribute: %m");
 526
 527                 r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
 528                 if (r < 0)
 529                         return log_error_errno(r, "Could not set source prefix length: %m");
 530         }
 531
 532         if (!in_addr_is_null(route->family, &route->prefsrc)) {
 533                 if (route->family == AF_INET)
 534                         r = sd_netlink_message_append_in_addr(req, RTA_PREFSRC, &route->prefsrc.in);
 535                 else if (route->family == AF_INET6)
 536                         r = sd_netlink_message_append_in6_addr(req, RTA_PREFSRC, &route->prefsrc.in6);
 537                 if (r < 0)
 538                         return log_error_errno(r, "Could not append RTA_PREFSRC attribute: %m");
 539         }
 540
 541         r = sd_rtnl_message_route_set_scope(req, route->scope);
 542         if (r < 0)
 543                 return log_error_errno(r, "Could not set scope: %m");
 544
 545         r = sd_rtnl_message_route_set_flags(req, route->flags);
 546         if (r < 0)
 547                 return log_error_errno(r, "Could not set flags: %m");
 548
 549         if (route->table != RT_TABLE_MAIN) {
 550                 if (route->table < 256) {
 551                         r = sd_rtnl_message_route_set_table(req, route->table);
 552                         if (r < 0)
 553                                 return log_error_errno(r, "Could not set route table: %m");
 554                 } else {
 555                         r = sd_rtnl_message_route_set_table(req, RT_TABLE_UNSPEC);
 556                         if (r < 0)
 557                                 return log_error_errno(r, "Could not set route table: %m");
 558
 559                         /* Table attribute to allow more than 256. */
 560                         r = sd_netlink_message_append_data(req, RTA_TABLE, &route->table, sizeof(route->table));
 561                         if (r < 0)
 562                                 return log_error_errno(r, "Could not append RTA_TABLE attribute: %m");
 563                 }
 564         }
 565
 566         r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
 567         if (r < 0)
 568                 return log_error_errno(r, "Could not append RTA_PRIORITY attribute: %m");
 569
 570         r = sd_netlink_message_append_u8(req, RTA_PREF, route->pref);
 571         if (r < 0)
 572                 return log_error_errno(r, "Could not append RTA_PREF attribute: %m");
 573
 574         if (route->lifetime != USEC_INFINITY && kernel_route_expiration_supported()) {
 575                 r = sd_netlink_message_append_u32(req, RTA_EXPIRES,
 576                         DIV_ROUND_UP(usec_sub_unsigned(route->lifetime, now(clock_boottime_or_monotonic())), USEC_PER_SEC));
 577                 if (r < 0)
 578                         return log_error_errno(r, "Could not append RTA_EXPIRES attribute: %m");
 579         }
 580
 581         r = sd_rtnl_message_route_set_type(req, route->type);
 582         if (r < 0)
 583                 return log_error_errno(r, "Could not set route type: %m");
 584
 585         if (!IN_SET(route->type, RTN_UNREACHABLE, RTN_PROHIBIT, RTN_BLACKHOLE)) {
 586                 r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
 587                 if (r < 0)
 588                         return log_error_errno(r, "Could not append RTA_OIF attribute: %m");
 589         }
 590
 591         r = sd_netlink_message_open_container(req, RTA_METRICS);
 592         if (r < 0)
 593                 return log_error_errno(r, "Could not append RTA_METRICS attribute: %m");
 594
 595         if (route->mtu > 0) {
 596                 r = sd_netlink_message_append_u32(req, RTAX_MTU, route->mtu);
 597                 if (r < 0)
 598                         return log_error_errno(r, "Could not append RTAX_MTU attribute: %m");
 599         }
 600
 601         if (route->initcwnd > 0) {
 602                 r = sd_netlink_message_append_u32(req, RTAX_INITCWND, route->initcwnd);
 603                 if (r < 0)
 604                         return log_error_errno(r, "Could not append RTAX_INITCWND attribute: %m");
 605         }
 606
 607         if (route->initrwnd > 0) {
 608                 r = sd_netlink_message_append_u32(req, RTAX_INITRWND, route->initrwnd);
 609                 if (r < 0)
 610                         return log_error_errno(r, "Could not append RTAX_INITRWND attribute: %m");
 611         }
 612
 613         if (route->quickack != -1) {
 614                 r = sd_netlink_message_append_u32(req, RTAX_QUICKACK, route->quickack);
 615                 if (r < 0)
 616                         return log_error_errno(r, "Could not append RTAX_QUICKACK attribute: %m");
 617         }
 618
 619         r = sd_netlink_message_close_container(req);
 620         if (r < 0)
 621                 return log_error_errno(r, "Could not append RTA_METRICS attribute: %m");
 622
 623         r = sd_netlink_call_async(link->manager->rtnl, req, callback,
 624                                   link_netlink_destroy_callback, link, 0, NULL);
 625         if (r < 0)
 626                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 627
 628         link_ref(link);
 629
 630         lifetime = route->lifetime;
 631
 632         r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, &route);
 633         if (r < 0)
 634                 return log_error_errno(r, "Could not add route: %m");
 635
 636         /* TODO: drop expiration handling once it can be pushed into the kernel */
 637         route->lifetime = lifetime;
 638
 639         if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
 640                 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(),
 641                                       route->lifetime, 0, route_expire_handler, route);
 642                 if (r < 0)
 643                         return log_error_errno(r, "Could not arm expiration timer: %m");
 644         }
 645
 646         sd_event_source_unref(route->expire);
 647         route->expire = TAKE_PTR(expire);
 648
 649         return 0;
 650 }
 651
 652 int config_parse_gateway(
 653                 const char *unit,
 654                 const char *filename,
 655                 unsigned line,
 656                 const char *section,
 657                 unsigned section_line,
 658                 const char *lvalue,
 659                 int ltype,
 660                 const char *rvalue,
 661                 void *data,
 662                 void *userdata) {
 663
 664         Network *network = userdata;
 665         _cleanup_(route_freep) Route *n = NULL;
 666         union in_addr_union buffer;
 667         int r, f;
 668
 669         assert(filename);
 670         assert(section);
 671         assert(lvalue);
 672         assert(rvalue);
 673         assert(data);
 674
 675         if (streq(section, "Network")) {
 676                 /* we are not in an Route section, so treat
 677                  * this as the special '0' section */
 678                 r = route_new_static(network, NULL, 0, &n);
 679         } else
 680                 r = route_new_static(network, filename, section_line, &n);
 681
 682         if (r < 0)
 683                 return r;
 684
 685         r = in_addr_from_string_auto(rvalue, &f, &buffer);
 686         if (r < 0) {
 687                 log_syntax(unit, LOG_ERR, filename, line, r, "Route is invalid, ignoring assignment: %s", rvalue);
 688                 return 0;
 689         }
 690
 691         n->family = f;
 692         n->gw = buffer;
 693         TAKE_PTR(n);
 694
 695         return 0;
 696 }
 697
 698 int config_parse_preferred_src(
 699                 const char *unit,
 700                 const char *filename,
 701                 unsigned line,
 702                 const char *section,
 703                 unsigned section_line,
 704                 const char *lvalue,
 705                 int ltype,
 706                 const char *rvalue,
 707                 void *data,
 708                 void *userdata) {
 709
 710         Network *network = userdata;
 711         _cleanup_(route_freep) Route *n = NULL;
 712         union in_addr_union buffer;
 713         int r, f;
 714
 715         assert(filename);
 716         assert(section);
 717         assert(lvalue);
 718         assert(rvalue);
 719         assert(data);
 720
 721         r = route_new_static(network, filename, section_line, &n);
 722         if (r < 0)
 723                 return r;
 724
 725         r = in_addr_from_string_auto(rvalue, &f, &buffer);
 726         if (r < 0) {
 727                 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
 728                            "Preferred source is invalid, ignoring assignment: %s", rvalue);
 729                 return 0;
 730         }
 731
 732         n->family = f;
 733         n->prefsrc = buffer;
 734         TAKE_PTR(n);
 735
 736         return 0;
 737 }
 738
 739 int config_parse_destination(
 740                 const char *unit,
 741                 const char *filename,
 742                 unsigned line,
 743                 const char *section,
 744                 unsigned section_line,
 745                 const char *lvalue,
 746                 int ltype,
 747                 const char *rvalue,
 748                 void *data,
 749                 void *userdata) {
 750
 751         Network *network = userdata;
 752         _cleanup_(route_freep) Route *n = NULL;
 753         union in_addr_union buffer;
 754         unsigned char prefixlen;
 755         int r;
 756
 757         assert(filename);
 758         assert(section);
 759         assert(lvalue);
 760         assert(rvalue);
 761         assert(data);
 762
 763         r = route_new_static(network, filename, section_line, &n);
 764         if (r < 0)
 765                 return r;
 766
 767         r = in_addr_prefix_from_string(rvalue, AF_INET, &buffer, &prefixlen);
 768         if (r < 0) {
 769                 r = in_addr_prefix_from_string(rvalue, AF_INET6, &buffer, &prefixlen);
 770                 if (r < 0) {
 771                         log_syntax(unit, LOG_ERR, filename, line, r,
 772                                    "Route %s= prefix is invalid, ignoring assignment: %s",
 773                                    lvalue, rvalue);
 774                         return 0;
 775                 }
 776
 777                 n->family = AF_INET6;
 778         } else
 779                 n->family = AF_INET;
 780
 781         if (streq(lvalue, "Destination")) {
 782                 n->dst = buffer;
 783                 n->dst_prefixlen = prefixlen;
 784         } else if (streq(lvalue, "Source")) {
 785                 n->src = buffer;
 786                 n->src_prefixlen = prefixlen;
 787         } else
 788                 assert_not_reached(lvalue);
 789
 790         TAKE_PTR(n);
 791         return 0;
 792 }
 793
 794 int config_parse_route_priority(
 795                 const char *unit,
 796                 const char *filename,
 797                 unsigned line,
 798                 const char *section,
 799                 unsigned section_line,
 800                 const char *lvalue,
 801                 int ltype,
 802                 const char *rvalue,
 803                 void *data,
 804                 void *userdata) {
 805
 806         Network *network = userdata;
 807         _cleanup_(route_freep) Route *n = NULL;
 808         int r;
 809
 810         assert(filename);
 811         assert(section);
 812         assert(lvalue);
 813         assert(rvalue);
 814         assert(data);
 815
 816         r = route_new_static(network, filename, section_line, &n);
 817         if (r < 0)
 818                 return r;
 819
 820         r = safe_atou32(rvalue, &n->priority);
 821         if (r < 0) {
 822                 log_syntax(unit, LOG_ERR, filename, line, r,
 823                            "Could not parse route priority \"%s\", ignoring assignment: %m", rvalue);
 824                 return 0;
 825         }
 826
 827         TAKE_PTR(n);
 828         return 0;
 829 }
 830
 831 int config_parse_route_scope(
 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_freep) Route *n = NULL;
 845         int r;
 846
 847         assert(filename);
 848         assert(section);
 849         assert(lvalue);
 850         assert(rvalue);
 851         assert(data);
 852
 853         r = route_new_static(network, filename, section_line, &n);
 854         if (r < 0)
 855                 return r;
 856
 857         if (streq(rvalue, "host"))
 858                 n->scope = RT_SCOPE_HOST;
 859         else if (streq(rvalue, "link"))
 860                 n->scope = RT_SCOPE_LINK;
 861         else if (streq(rvalue, "global"))
 862                 n->scope = RT_SCOPE_UNIVERSE;
 863         else {
 864                 log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route scope: %s", rvalue);
 865                 return 0;
 866         }
 867
 868         TAKE_PTR(n);
 869         return 0;
 870 }
 871
 872 int config_parse_route_table(
 873                 const char *unit,
 874                 const char *filename,
 875                 unsigned line,
 876                 const char *section,
 877                 unsigned section_line,
 878                 const char *lvalue,
 879                 int ltype,
 880                 const char *rvalue,
 881                 void *data,
 882                 void *userdata) {
 883
 884         _cleanup_(route_freep) Route *n = NULL;
 885         Network *network = userdata;
 886         int r;
 887
 888         assert(filename);
 889         assert(section);
 890         assert(lvalue);
 891         assert(rvalue);
 892         assert(data);
 893
 894         r = route_new_static(network, filename, section_line, &n);
 895         if (r < 0)
 896                 return r;
 897
 898         r = safe_atou32(rvalue, &n->table);
 899         if (r < 0) {
 900                 log_syntax(unit, LOG_ERR, filename, line, r,
 901                            "Could not parse route table number \"%s\", ignoring assignment: %m", rvalue);
 902                 return 0;
 903         }
 904
 905         TAKE_PTR(n);
 906         return 0;
 907 }
 908
 909 int config_parse_gateway_onlink(
 910                 const char *unit,
 911                 const char *filename,
 912                 unsigned line,
 913                 const char *section,
 914                 unsigned section_line,
 915                 const char *lvalue,
 916                 int ltype,
 917                 const char *rvalue,
 918                 void *data,
 919                 void *userdata) {
 920
 921         Network *network = userdata;
 922         _cleanup_(route_freep) Route *n = NULL;
 923         int r;
 924
 925         assert(filename);
 926         assert(section);
 927         assert(lvalue);
 928         assert(rvalue);
 929         assert(data);
 930
 931         r = route_new_static(network, filename, section_line, &n);
 932         if (r < 0)
 933                 return r;
 934
 935         r = parse_boolean(rvalue);
 936         if (r < 0) {
 937                 log_syntax(unit, LOG_ERR, filename, line, r,
 938                            "Could not parse gateway onlink \"%s\", ignoring assignment: %m", rvalue);
 939                 return 0;
 940         }
 941
 942         SET_FLAG(n->flags, RTNH_F_ONLINK, r);
 943         TAKE_PTR(n);
 944         return 0;
 945 }
 946
 947 int config_parse_ipv6_route_preference(
 948                 const char *unit,
 949                 const char *filename,
 950                 unsigned line,
 951                 const char *section,
 952                 unsigned section_line,
 953                 const char *lvalue,
 954                 int ltype,
 955                 const char *rvalue,
 956                 void *data,
 957                 void *userdata) {
 958
 959         Network *network = userdata;
 960         _cleanup_(route_freep) Route *n = NULL;
 961         int r;
 962
 963         r = route_new_static(network, filename, section_line, &n);
 964         if (r < 0)
 965                 return r;
 966
 967         if (streq(rvalue, "low"))
 968                 n->pref = ICMPV6_ROUTER_PREF_LOW;
 969         else if (streq(rvalue, "medium"))
 970                 n->pref = ICMPV6_ROUTER_PREF_MEDIUM;
 971         else if (streq(rvalue, "high"))
 972                 n->pref = ICMPV6_ROUTER_PREF_HIGH;
 973         else {
 974                 log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route preference: %s", rvalue);
 975                 return 0;
 976         }
 977
 978         TAKE_PTR(n);
 979         return 0;
 980 }
 981
 982 int config_parse_route_protocol(
 983                 const char *unit,
 984                 const char *filename,
 985                 unsigned line,
 986                 const char *section,
 987                 unsigned section_line,
 988                 const char *lvalue,
 989                 int ltype,
 990                 const char *rvalue,
 991                 void *data,
 992                 void *userdata) {
 993
 994         Network *network = userdata;
 995         _cleanup_(route_freep) Route *n = NULL;
 996         int r;
 997
 998         r = route_new_static(network, filename, section_line, &n);
 999         if (r < 0)
1000                 return r;
1001
1002         if (streq(rvalue, "kernel"))
1003                 n->protocol = RTPROT_KERNEL;
1004         else if (streq(rvalue, "boot"))
1005                 n->protocol = RTPROT_BOOT;
1006         else if (streq(rvalue, "static"))
1007                 n->protocol = RTPROT_STATIC;
1008         else {
1009                 r = safe_atou8(rvalue , &n->protocol);
1010                 if (r < 0) {
1011                         log_syntax(unit, LOG_ERR, filename, line, r, "Could not parse route protocol \"%s\", ignoring assignment: %m", rvalue);
1012                         return 0;
1013                 }
1014         }
1015
1016         TAKE_PTR(n);
1017         return 0;
1018 }
1019
1020 int config_parse_route_type(
1021                 const char *unit,
1022                 const char *filename,
1023                 unsigned line,
1024                 const char *section,
1025                 unsigned section_line,
1026                 const char *lvalue,
1027                 int ltype,
1028                 const char *rvalue,
1029                 void *data,
1030                 void *userdata) {
1031
1032         Network *network = userdata;
1033         _cleanup_(route_freep) Route *n = NULL;
1034         int r;
1035
1036         r = route_new_static(network, filename, section_line, &n);
1037         if (r < 0)
1038                 return r;
1039
1040         if (streq(rvalue, "unicast"))
1041                 n->type = RTN_UNICAST;
1042         else if (streq(rvalue, "blackhole"))
1043                 n->type = RTN_BLACKHOLE;
1044         else if (streq(rvalue, "unreachable"))
1045                 n->type = RTN_UNREACHABLE;
1046         else if (streq(rvalue, "prohibit"))
1047                 n->type = RTN_PROHIBIT;
1048         else {
1049                 log_syntax(unit, LOG_ERR, filename, line, r, "Could not parse route type \"%s\", ignoring assignment: %m", rvalue);
1050                 return 0;
1051         }
1052
1053         TAKE_PTR(n);
1054         return 0;
1055 }
1056
1057 int config_parse_tcp_window(
1058                 const char *unit,
1059                 const char *filename,
1060                 unsigned line,
1061                 const char *section,
1062                 unsigned section_line,
1063                 const char *lvalue,
1064                 int ltype,
1065                 const char *rvalue,
1066                 void *data,
1067                 void *userdata) {
1068
1069         _cleanup_(route_freep) Route *n = NULL;
1070         Network *network = userdata;
1071         uint64_t k;
1072         int r;
1073
1074         assert(filename);
1075         assert(section);
1076         assert(lvalue);
1077         assert(rvalue);
1078         assert(data);
1079
1080         r = route_new_static(network, filename, section_line, &n);
1081         if (r < 0)
1082                 return r;
1083
1084         r = parse_size(rvalue, 1024, &k);
1085         if (r < 0 || k > UINT32_MAX)  {
1086                 log_syntax(unit, LOG_ERR, filename, line, r,
1087                            "Could not parse TCP %s \"%s\" bytes, ignoring assignment: %m", rvalue, lvalue);
1088                 return 0;
1089         }
1090
1091         if (streq(lvalue, "InitialCongestionWindow"))
1092                 n->initcwnd = k;
1093         else if (streq(lvalue, "InitialAdvertisedReceiveWindow"))
1094                 n->initrwnd = k;
1095         else {
1096                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse TCP %s: %s", lvalue, rvalue);
1097                 return 0;
1098         }
1099
1100         TAKE_PTR(n);
1101         return 0;
1102 }
1103
1104 int config_parse_quickack(
1105                 const char *unit,
1106                 const char *filename,
1107                 unsigned line,
1108                 const char *section,
1109                 unsigned section_line,
1110                 const char *lvalue,
1111                 int ltype,
1112                 const char *rvalue,
1113                 void *data,
1114                 void *userdata) {
1115
1116         _cleanup_(route_freep) Route *n = NULL;
1117         Network *network = userdata;
1118         int k, r;
1119
1120         assert(filename);
1121         assert(section);
1122         assert(lvalue);
1123         assert(rvalue);
1124         assert(data);
1125
1126         r = route_new_static(network, filename, section_line, &n);
1127         if (r < 0)
1128                 return r;
1129
1130         k = parse_boolean(rvalue);
1131         if (k < 0) {
1132                 log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse TCP quickack, ignoring: %s", rvalue);
1133                 return 0;
1134         }
1135
1136         n->quickack = !!k;
1137         TAKE_PTR(n);
1138         return 0;
1139 }
1140
1141 int config_parse_route_mtu(
1142                 const char *unit,
1143                 const char *filename,
1144                 unsigned line,
1145                 const char *section,
1146                 unsigned section_line,
1147                 const char *lvalue,
1148                 int ltype,
1149                 const char *rvalue,
1150                 void *data,
1151                 void *userdata) {
1152
1153         Network *network = userdata;
1154         _cleanup_(route_freep) Route *n = NULL;
1155         int r;
1156
1157         assert(filename);
1158         assert(section);
1159         assert(lvalue);
1160         assert(rvalue);
1161         assert(data);
1162
1163         r = route_new_static(network, filename, section_line, &n);
1164         if (r < 0)
1165                 return r;
1166
1167         r = config_parse_mtu(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &n->mtu, userdata);
1168         if (r < 0)
1169                 return r;
1170
1171         TAKE_PTR(n);
1172         return 0;
1173 }