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