src/network/networkd-radv.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2017 Intel Corporation. All rights reserved.
   4 ***/
   5
   6 #include <netinet/icmp6.h>
   7 #include <arpa/inet.h>
   8
   9 #include "networkd-address.h"
  10 #include "networkd-manager.h"
  11 #include "networkd-radv.h"
  12 #include "parse-util.h"
  13 #include "sd-radv.h"
  14 #include "string-util.h"
  15 #include "string-table.h"
  16 #include "strv.h"
  17
  18 static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = {
  19         [RADV_PREFIX_DELEGATION_NONE] = "no",
  20         [RADV_PREFIX_DELEGATION_STATIC] = "static",
  21         [RADV_PREFIX_DELEGATION_DHCP6] = "dhcpv6",
  22         [RADV_PREFIX_DELEGATION_BOTH] = "yes",
  23 };
  24
  25 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(
  26                 radv_prefix_delegation,
  27                 RADVPrefixDelegation,
  28                 RADV_PREFIX_DELEGATION_BOTH);
  29
  30 int config_parse_router_prefix_delegation(
  31                 const char *unit,
  32                 const char *filename,
  33                 unsigned line,
  34                 const char *section,
  35                 unsigned section_line,
  36                 const char *lvalue,
  37                 int ltype,
  38                 const char *rvalue,
  39                 void *data,
  40                 void *userdata) {
  41
  42         Network *network = userdata;
  43         RADVPrefixDelegation d;
  44
  45         assert(filename);
  46         assert(section);
  47         assert(lvalue);
  48         assert(rvalue);
  49         assert(data);
  50
  51         d = radv_prefix_delegation_from_string(rvalue);
  52         if (d < 0) {
  53                 log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Invalid router prefix delegation '%s', ignoring assignment.", rvalue);
  54                 return 0;
  55         }
  56
  57         network->router_prefix_delegation = d;
  58
  59         return 0;
  60 }
  61
  62 int config_parse_router_preference(const char *unit,
  63                                    const char *filename,
  64                                    unsigned line,
  65                                    const char *section,
  66                                    unsigned section_line,
  67                                    const char *lvalue,
  68                                    int ltype,
  69                                    const char *rvalue,
  70                                    void *data,
  71                                    void *userdata) {
  72         Network *network = userdata;
  73
  74         assert(filename);
  75         assert(section);
  76         assert(lvalue);
  77         assert(rvalue);
  78         assert(data);
  79
  80         if (streq(rvalue, "high"))
  81                 network->router_preference = SD_NDISC_PREFERENCE_HIGH;
  82         else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
  83                 network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
  84         else if (streq(rvalue, "low"))
  85                 network->router_preference = SD_NDISC_PREFERENCE_LOW;
  86         else
  87                 log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router preference '%s' is invalid, ignoring assignment: %m", rvalue);
  88
  89         return 0;
  90 }
  91
  92 void prefix_free(Prefix *prefix) {
  93         if (!prefix)
  94                 return;
  95
  96         if (prefix->network) {
  97                 LIST_REMOVE(prefixes, prefix->network->static_prefixes, prefix);
  98                 assert(prefix->network->n_static_prefixes > 0);
  99                 prefix->network->n_static_prefixes--;
 100
 101                 if (prefix->section)
 102                         hashmap_remove(prefix->network->prefixes_by_section,
 103                                        prefix->section);
 104         }
 105
 106         network_config_section_free(prefix->section);
 107         prefix->radv_prefix = sd_radv_prefix_unref(prefix->radv_prefix);
 108
 109         free(prefix);
 110 }
 111
 112 int prefix_new(Prefix **ret) {
 113         _cleanup_(prefix_freep) Prefix *prefix = NULL;
 114
 115         prefix = new0(Prefix, 1);
 116         if (!prefix)
 117                 return -ENOMEM;
 118
 119         if (sd_radv_prefix_new(&prefix->radv_prefix) < 0)
 120                 return -ENOMEM;
 121
 122         *ret = TAKE_PTR(prefix);
 123
 124         return 0;
 125 }
 126
 127 static int prefix_new_static(Network *network, const char *filename,
 128                              unsigned section_line, Prefix **ret) {
 129         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
 130         _cleanup_(prefix_freep) Prefix *prefix = NULL;
 131         int r;
 132
 133         assert(network);
 134         assert(ret);
 135         assert(!!filename == (section_line > 0));
 136
 137         if (filename) {
 138                 r = network_config_section_new(filename, section_line, &n);
 139                 if (r < 0)
 140                         return r;
 141
 142                 if (section_line) {
 143                         prefix = hashmap_get(network->prefixes_by_section, n);
 144                         if (prefix) {
 145                                 *ret = TAKE_PTR(prefix);
 146
 147                                 return 0;
 148                         }
 149                 }
 150         }
 151
 152         r = prefix_new(&prefix);
 153         if (r < 0)
 154                 return r;
 155
 156         prefix->network = network;
 157         LIST_APPEND(prefixes, network->static_prefixes, prefix);
 158         network->n_static_prefixes++;
 159
 160         if (filename) {
 161                 prefix->section = TAKE_PTR(n);
 162
 163                 r = hashmap_ensure_allocated(&network->prefixes_by_section, &network_config_hash_ops);
 164                 if (r < 0)
 165                         return r;
 166
 167                 r = hashmap_put(network->prefixes_by_section, prefix->section, prefix);
 168                 if (r < 0)
 169                         return r;
 170         }
 171
 172         *ret = TAKE_PTR(prefix);
 173
 174         return 0;
 175 }
 176
 177 int config_parse_prefix(const char *unit,
 178                 const char *filename,
 179                 unsigned line,
 180                 const char *section,
 181                 unsigned section_line,
 182                 const char *lvalue,
 183                 int ltype,
 184                 const char *rvalue,
 185                 void *data,
 186                 void *userdata) {
 187
 188         Network *network = userdata;
 189         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 190         uint8_t prefixlen = 64;
 191         union in_addr_union in6addr;
 192         int r;
 193
 194         assert(filename);
 195         assert(section);
 196         assert(lvalue);
 197         assert(rvalue);
 198         assert(data);
 199
 200         r = prefix_new_static(network, filename, section_line, &p);
 201         if (r < 0)
 202                 return r;
 203
 204         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 205         if (r < 0) {
 206                 log_syntax(unit, LOG_ERR, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
 207                 return 0;
 208         }
 209
 210         if (sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen) < 0)
 211                 return -EADDRNOTAVAIL;
 212
 213         log_syntax(unit, LOG_INFO, filename, line, r, "Found prefix %s", rvalue);
 214
 215         p = NULL;
 216
 217         return 0;
 218 }
 219
 220 int config_parse_prefix_flags(const char *unit,
 221                               const char *filename,
 222                               unsigned line,
 223                               const char *section,
 224                               unsigned section_line,
 225                               const char *lvalue,
 226                               int ltype,
 227                               const char *rvalue,
 228                               void *data,
 229                               void *userdata) {
 230         Network *network = userdata;
 231         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 232         int r, val;
 233
 234         assert(filename);
 235         assert(section);
 236         assert(lvalue);
 237         assert(rvalue);
 238         assert(data);
 239
 240         r = prefix_new_static(network, filename, section_line, &p);
 241         if (r < 0)
 242                 return r;
 243
 244         r = parse_boolean(rvalue);
 245         if (r < 0) {
 246                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
 247                 return 0;
 248         }
 249
 250         val = r;
 251
 252         if (streq(lvalue, "OnLink"))
 253                 r = sd_radv_prefix_set_onlink(p->radv_prefix, val);
 254         else if (streq(lvalue, "AddressAutoconfiguration"))
 255                 r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, val);
 256         if (r < 0)
 257                 return r;
 258
 259         p = NULL;
 260
 261         return 0;
 262 }
 263
 264 int config_parse_prefix_lifetime(const char *unit,
 265                                  const char *filename,
 266                                  unsigned line,
 267                                  const char *section,
 268                                  unsigned section_line,
 269                                  const char *lvalue,
 270                                  int ltype,
 271                                  const char *rvalue,
 272                                  void *data,
 273                                  void *userdata) {
 274         Network *network = userdata;
 275         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 276         usec_t usec;
 277         int r;
 278
 279         assert(filename);
 280         assert(section);
 281         assert(lvalue);
 282         assert(rvalue);
 283         assert(data);
 284
 285         r = prefix_new_static(network, filename, section_line, &p);
 286         if (r < 0)
 287                 return r;
 288
 289         r = parse_sec(rvalue, &usec);
 290         if (r < 0) {
 291                 log_syntax(unit, LOG_ERR, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
 292                 return 0;
 293         }
 294
 295         /* a value of 0xffffffff represents infinity */
 296         if (streq(lvalue, "PreferredLifetimeSec"))
 297                 r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
 298                                                           DIV_ROUND_UP(usec, USEC_PER_SEC));
 299         else if (streq(lvalue, "ValidLifetimeSec"))
 300                 r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
 301                                                       DIV_ROUND_UP(usec, USEC_PER_SEC));
 302         if (r < 0)
 303                 return r;
 304
 305         p = NULL;
 306
 307         return 0;
 308 }
 309
 310 static int radv_get_ip6dns(Network *network, struct in6_addr **dns,
 311                            size_t *n_dns) {
 312         _cleanup_free_ struct in6_addr *addresses = NULL;
 313         size_t i, n_addresses = 0, n_allocated = 0;
 314
 315         assert(network);
 316         assert(dns);
 317         assert(n_dns);
 318
 319         for (i = 0; i < network->n_dns; i++) {
 320                 union in_addr_union *addr;
 321
 322                 if (network->dns[i].family != AF_INET6)
 323                         continue;
 324
 325                 addr = &network->dns[i].address;
 326
 327                 if (in_addr_is_null(AF_INET6, addr) ||
 328                     in_addr_is_link_local(AF_INET6, addr) ||
 329                     in_addr_is_localhost(AF_INET6, addr))
 330                         continue;
 331
 332                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
 333                         return -ENOMEM;
 334
 335                 addresses[n_addresses++] = addr->in6;
 336         }
 337
 338         if (addresses) {
 339                 *dns = TAKE_PTR(addresses);
 340
 341                 *n_dns = n_addresses;
 342         }
 343
 344         return n_addresses;
 345 }
 346
 347 static int radv_set_dns(Link *link, Link *uplink) {
 348         _cleanup_free_ struct in6_addr *dns = NULL;
 349         size_t n_dns;
 350         usec_t lifetime_usec;
 351         int r;
 352
 353         if (!link->network->router_emit_dns)
 354                 return 0;
 355
 356         if (link->network->router_dns) {
 357                 dns = newdup(struct in6_addr, link->network->router_dns,
 358                              link->network->n_router_dns);
 359                 if (dns == NULL)
 360                         return -ENOMEM;
 361
 362                 n_dns = link->network->n_router_dns;
 363                 lifetime_usec = link->network->router_dns_lifetime_usec;
 364
 365                 goto set_dns;
 366         }
 367
 368         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 369
 370         r = radv_get_ip6dns(link->network, &dns, &n_dns);
 371         if (r > 0)
 372                 goto set_dns;
 373
 374         if (uplink) {
 375                 if (uplink->network == NULL) {
 376                         log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
 377                         return 0;
 378                 }
 379
 380                 r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
 381                 if (r > 0)
 382                         goto set_dns;
 383         }
 384
 385         return 0;
 386
 387  set_dns:
 388         return sd_radv_set_rdnss(link->radv,
 389                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 390                                  dns, n_dns);
 391 }
 392
 393 static int radv_set_domains(Link *link, Link *uplink) {
 394         OrderedSet *search_domains;
 395         usec_t lifetime_usec;
 396         _cleanup_free_ char **s = NULL; /* just free() because the strings are owned by the set */
 397
 398         if (!link->network->router_emit_domains)
 399                 return 0;
 400
 401         search_domains = link->network->router_search_domains;
 402         lifetime_usec = link->network->router_dns_lifetime_usec;
 403
 404         if (search_domains)
 405                 goto set_domains;
 406
 407         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 408
 409         search_domains = link->network->search_domains;
 410         if (search_domains)
 411                 goto set_domains;
 412
 413         if (uplink) {
 414                 if (uplink->network == NULL) {
 415                         log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
 416                         return 0;
 417                 }
 418
 419                 search_domains = uplink->network->search_domains;
 420                 if (search_domains)
 421                         goto set_domains;
 422         }
 423
 424         return 0;
 425
 426  set_domains:
 427         s = ordered_set_get_strv(search_domains);
 428         if (!s)
 429                 return log_oom();
 430
 431         return sd_radv_set_dnssl(link->radv,
 432                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 433                                  s);
 434
 435 }
 436
 437 int radv_emit_dns(Link *link) {
 438         Link *uplink;
 439         int r;
 440
 441         uplink = manager_find_uplink(link->manager, link);
 442
 443         r = radv_set_dns(link, uplink);
 444         if (r < 0)
 445                 log_link_warning_errno(link, r, "Could not set RA DNS: %m");
 446
 447         r = radv_set_domains(link, uplink);
 448         if (r < 0)
 449                 log_link_warning_errno(link, r, "Could not set RA Domains: %m");
 450
 451         return 0;
 452 }
 453
 454 int radv_configure(Link *link) {
 455         int r;
 456         Prefix *p;
 457
 458         assert(link);
 459         assert(link->network);
 460
 461         r = sd_radv_new(&link->radv);
 462         if (r < 0)
 463                 return r;
 464
 465         r = sd_radv_attach_event(link->radv, NULL, 0);
 466         if (r < 0)
 467                 return r;
 468
 469         r = sd_radv_set_mac(link->radv, &link->mac);
 470         if (r < 0)
 471                 return r;
 472
 473         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 474         if (r < 0)
 475                 return r;
 476
 477         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 478         if (r < 0)
 479                 return r;
 480
 481         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 482         if (r < 0)
 483                 return r;
 484
 485         /* a value of 0xffffffff represents infinity, 0x0 means this host is
 486            not a router */
 487         r = sd_radv_set_router_lifetime(link->radv,
 488                                         DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
 489         if (r < 0)
 490                 return r;
 491
 492         if (link->network->router_lifetime_usec > 0) {
 493                 r = sd_radv_set_preference(link->radv,
 494                                            link->network->router_preference);
 495                 if (r < 0)
 496                         return r;
 497         }
 498
 499         if (IN_SET(link->network->router_prefix_delegation,
 500                    RADV_PREFIX_DELEGATION_STATIC,
 501                    RADV_PREFIX_DELEGATION_BOTH)) {
 502
 503                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
 504                         r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
 505                         if (r == -EEXIST)
 506                                 continue;
 507                         if (r == -ENOEXEC) {
 508                                 log_link_warning_errno(link, r, "[IPv6Prefix] section configured without Prefix= setting, ignoring section.");
 509                                 continue;
 510                         }
 511                         if (r < 0)
 512                                 return r;
 513                 }
 514         }
 515
 516         return radv_emit_dns(link);
 517 }