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                         network_config_section_free(prefix->section);
 105                 }
 106         }
 107
 108         prefix->radv_prefix = sd_radv_prefix_unref(prefix->radv_prefix);
 109
 110         free(prefix);
 111 }
 112
 113 int prefix_new(Prefix **ret) {
 114         _cleanup_(prefix_freep) Prefix *prefix = NULL;
 115
 116         prefix = new0(Prefix, 1);
 117         if (!prefix)
 118                 return -ENOMEM;
 119
 120         if (sd_radv_prefix_new(&prefix->radv_prefix) < 0)
 121                 return -ENOMEM;
 122
 123         *ret = TAKE_PTR(prefix);
 124
 125         return 0;
 126 }
 127
 128 int prefix_new_static(Network *network, const char *filename,
 129                       unsigned section_line, Prefix **ret) {
 130         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
 131         _cleanup_(prefix_freep) Prefix *prefix = NULL;
 132         int r;
 133
 134         assert(network);
 135         assert(ret);
 136         assert(!!filename == (section_line > 0));
 137
 138         if (filename) {
 139                 r = network_config_section_new(filename, section_line, &n);
 140                 if (r < 0)
 141                         return r;
 142
 143                 if (section_line) {
 144                         prefix = hashmap_get(network->prefixes_by_section, n);
 145                         if (prefix) {
 146                                 *ret = TAKE_PTR(prefix);
 147
 148                                 return 0;
 149                         }
 150                 }
 151         }
 152
 153         r = prefix_new(&prefix);
 154         if (r < 0)
 155                 return r;
 156
 157         if (filename) {
 158                 prefix->section = TAKE_PTR(n);
 159
 160                 r = hashmap_put(network->prefixes_by_section, prefix->section,
 161                                 prefix);
 162                 if (r < 0)
 163                         return r;
 164         }
 165
 166         prefix->network = network;
 167         LIST_APPEND(prefixes, network->static_prefixes, prefix);
 168         network->n_static_prefixes++;
 169
 170         *ret = TAKE_PTR(prefix);
 171
 172         return 0;
 173 }
 174
 175 int config_parse_prefix(const char *unit,
 176                 const char *filename,
 177                 unsigned line,
 178                 const char *section,
 179                 unsigned section_line,
 180                 const char *lvalue,
 181                 int ltype,
 182                 const char *rvalue,
 183                 void *data,
 184                 void *userdata) {
 185
 186         Network *network = userdata;
 187         _cleanup_(prefix_freep) Prefix *p = NULL;
 188         uint8_t prefixlen = 64;
 189         union in_addr_union in6addr;
 190         int r;
 191
 192         assert(filename);
 193         assert(section);
 194         assert(lvalue);
 195         assert(rvalue);
 196         assert(data);
 197
 198         r = prefix_new_static(network, filename, section_line, &p);
 199         if (r < 0)
 200                 return r;
 201
 202         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 203         if (r < 0) {
 204                 log_syntax(unit, LOG_ERR, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
 205                 return 0;
 206         }
 207
 208         if (sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen) < 0)
 209                 return -EADDRNOTAVAIL;
 210
 211         log_syntax(unit, LOG_INFO, filename, line, r, "Found prefix %s", rvalue);
 212
 213         p = NULL;
 214
 215         return 0;
 216 }
 217
 218 int config_parse_prefix_flags(const char *unit,
 219                               const char *filename,
 220                               unsigned line,
 221                               const char *section,
 222                               unsigned section_line,
 223                               const char *lvalue,
 224                               int ltype,
 225                               const char *rvalue,
 226                               void *data,
 227                               void *userdata) {
 228         Network *network = userdata;
 229         _cleanup_(prefix_freep) Prefix *p = NULL;
 230         int r, val;
 231
 232         assert(filename);
 233         assert(section);
 234         assert(lvalue);
 235         assert(rvalue);
 236         assert(data);
 237
 238         r = prefix_new_static(network, filename, section_line, &p);
 239         if (r < 0)
 240                 return r;
 241
 242         r = parse_boolean(rvalue);
 243         if (r < 0) {
 244                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
 245                 return 0;
 246         }
 247
 248         val = r;
 249
 250         if (streq(lvalue, "OnLink"))
 251                 r = sd_radv_prefix_set_onlink(p->radv_prefix, val);
 252         else if (streq(lvalue, "AddressAutoconfiguration"))
 253                 r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, val);
 254         if (r < 0)
 255                 return r;
 256
 257         p = NULL;
 258
 259         return 0;
 260 }
 261
 262 int config_parse_prefix_lifetime(const char *unit,
 263                                  const char *filename,
 264                                  unsigned line,
 265                                  const char *section,
 266                                  unsigned section_line,
 267                                  const char *lvalue,
 268                                  int ltype,
 269                                  const char *rvalue,
 270                                  void *data,
 271                                  void *userdata) {
 272         Network *network = userdata;
 273         _cleanup_(prefix_freep) Prefix *p = NULL;
 274         usec_t usec;
 275         int r;
 276
 277         assert(filename);
 278         assert(section);
 279         assert(lvalue);
 280         assert(rvalue);
 281         assert(data);
 282
 283         r = prefix_new_static(network, filename, section_line, &p);
 284         if (r < 0)
 285                 return r;
 286
 287         r = parse_sec(rvalue, &usec);
 288         if (r < 0) {
 289                 log_syntax(unit, LOG_ERR, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
 290                 return 0;
 291         }
 292
 293         /* a value of 0xffffffff represents infinity */
 294         if (streq(lvalue, "PreferredLifetimeSec"))
 295                 r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
 296                                                           DIV_ROUND_UP(usec, USEC_PER_SEC));
 297         else if (streq(lvalue, "ValidLifetimeSec"))
 298                 r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
 299                                                       DIV_ROUND_UP(usec, USEC_PER_SEC));
 300         if (r < 0)
 301                 return r;
 302
 303         p = NULL;
 304
 305         return 0;
 306 }
 307
 308 static int radv_get_ip6dns(Network *network, struct in6_addr **dns,
 309                            size_t *n_dns) {
 310         _cleanup_free_ struct in6_addr *addresses = NULL;
 311         size_t i, n_addresses = 0, n_allocated = 0;
 312
 313         assert(network);
 314         assert(dns);
 315         assert(n_dns);
 316
 317         for (i = 0; i < network->n_dns; i++) {
 318                 union in_addr_union *addr;
 319
 320                 if (network->dns[i].family != AF_INET6)
 321                         continue;
 322
 323                 addr = &network->dns[i].address;
 324
 325                 if (in_addr_is_null(AF_INET6, addr) ||
 326                     in_addr_is_link_local(AF_INET6, addr) ||
 327                     in_addr_is_localhost(AF_INET6, addr))
 328                         continue;
 329
 330                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
 331                         return -ENOMEM;
 332
 333                 addresses[n_addresses++] = addr->in6;
 334         }
 335
 336         if (addresses) {
 337                 *dns = TAKE_PTR(addresses);
 338
 339                 *n_dns = n_addresses;
 340         }
 341
 342         return n_addresses;
 343 }
 344
 345 static int radv_set_dns(Link *link, Link *uplink) {
 346         _cleanup_free_ struct in6_addr *dns = NULL;
 347         size_t n_dns;
 348         usec_t lifetime_usec;
 349         int r;
 350
 351         if (!link->network->router_emit_dns)
 352                 return 0;
 353
 354         if (link->network->router_dns) {
 355                 dns = newdup(struct in6_addr, link->network->router_dns,
 356                              link->network->n_router_dns);
 357                 if (dns == NULL)
 358                         return -ENOMEM;
 359
 360                 n_dns = link->network->n_router_dns;
 361                 lifetime_usec = link->network->router_dns_lifetime_usec;
 362
 363                 goto set_dns;
 364         }
 365
 366         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 367
 368         r = radv_get_ip6dns(link->network, &dns, &n_dns);
 369         if (r > 0)
 370                 goto set_dns;
 371
 372         if (uplink) {
 373                 if (uplink->network == NULL) {
 374                         log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
 375                         return 0;
 376                 }
 377
 378                 r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
 379                 if (r > 0)
 380                         goto set_dns;
 381         }
 382
 383         return 0;
 384
 385  set_dns:
 386         return sd_radv_set_rdnss(link->radv,
 387                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 388                                  dns, n_dns);
 389 }
 390
 391 static int radv_set_domains(Link *link, Link *uplink) {
 392         char **search_domains;
 393         usec_t lifetime_usec;
 394
 395         if (!link->network->router_emit_domains)
 396                 return 0;
 397
 398         search_domains = link->network->router_search_domains;
 399         lifetime_usec = link->network->router_dns_lifetime_usec;
 400
 401         if (search_domains)
 402                 goto set_domains;
 403
 404         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 405
 406         search_domains = link->network->search_domains;
 407         if (search_domains)
 408                 goto set_domains;
 409
 410         if (uplink) {
 411                 if (uplink->network == NULL) {
 412                         log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
 413                         return 0;
 414                 }
 415
 416                 search_domains = uplink->network->search_domains;
 417                 if (search_domains)
 418                         goto set_domains;
 419         }
 420
 421         return 0;
 422
 423  set_domains:
 424         return sd_radv_set_dnssl(link->radv,
 425                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 426                                  search_domains);
 427
 428 }
 429
 430 int radv_emit_dns(Link *link) {
 431         Link *uplink;
 432         int r;
 433
 434         uplink = manager_find_uplink(link->manager, link);
 435
 436         r = radv_set_dns(link, uplink);
 437         if (r < 0)
 438                 log_link_warning_errno(link, r, "Could not set RA DNS: %m");
 439
 440         r = radv_set_domains(link, uplink);
 441         if (r < 0)
 442                 log_link_warning_errno(link, r, "Could not set RA Domains: %m");
 443
 444         return 0;
 445 }
 446
 447 int radv_configure(Link *link) {
 448         int r;
 449         Prefix *p;
 450
 451         assert(link);
 452         assert(link->network);
 453
 454         r = sd_radv_new(&link->radv);
 455         if (r < 0)
 456                 return r;
 457
 458         r = sd_radv_attach_event(link->radv, NULL, 0);
 459         if (r < 0)
 460                 return r;
 461
 462         r = sd_radv_set_mac(link->radv, &link->mac);
 463         if (r < 0)
 464                 return r;
 465
 466         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 467         if (r < 0)
 468                 return r;
 469
 470         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 471         if (r < 0)
 472                 return r;
 473
 474         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 475         if (r < 0)
 476                 return r;
 477
 478         /* a value of 0xffffffff represents infinity, 0x0 means this host is
 479            not a router */
 480         r = sd_radv_set_router_lifetime(link->radv,
 481                                         DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
 482         if (r < 0)
 483                 return r;
 484
 485         if (link->network->router_lifetime_usec > 0) {
 486                 r = sd_radv_set_preference(link->radv,
 487                                            link->network->router_preference);
 488                 if (r < 0)
 489                         return r;
 490         }
 491
 492         if (IN_SET(link->network->router_prefix_delegation,
 493                    RADV_PREFIX_DELEGATION_STATIC,
 494                    RADV_PREFIX_DELEGATION_BOTH)) {
 495                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
 496                         r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
 497                         if (r != -EEXIST && r < 0)
 498                                 return r;
 499                 }
 500         }
 501
 502         return radv_emit_dns(link);
 503 }