src/libsystemd-network/sd-radv.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright (C) 2017 Intel Corporation. All rights reserved.
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <netinet/icmp6.h>
  21 #include <netinet/in.h>
  22 #include <arpa/inet.h>
  23 #include <linux/in6.h>
  24
  25 #include "sd-radv.h"
  26
  27 #include "macro.h"
  28 #include "alloc-util.h"
  29 #include "fd-util.h"
  30 #include "icmp6-util.h"
  31 #include "in-addr-util.h"
  32 #include "radv-internal.h"
  33 #include "socket-util.h"
  34 #include "string-util.h"
  35 #include "util.h"
  36 #include "random-util.h"
  37
  38 _public_ int sd_radv_new(sd_radv **ret) {
  39         _cleanup_(sd_radv_unrefp) sd_radv *ra = NULL;
  40
  41         assert_return(ret, -EINVAL);
  42
  43         ra = new0(sd_radv, 1);
  44         if (!ra)
  45                 return -ENOMEM;
  46
  47         ra->n_ref = 1;
  48         ra->fd = -1;
  49
  50         LIST_HEAD_INIT(ra->prefixes);
  51
  52         *ret = ra;
  53         ra = NULL;
  54
  55         return 0;
  56 }
  57
  58 _public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) {
  59         int r;
  60
  61         assert_return(ra, -EINVAL);
  62         assert_return(!ra->event, -EBUSY);
  63
  64         if (event)
  65                 ra->event = sd_event_ref(event);
  66         else {
  67                 r = sd_event_default(&ra->event);
  68                 if (r < 0)
  69                         return 0;
  70         }
  71
  72         ra->event_priority = priority;
  73
  74         return 0;
  75 }
  76
  77 _public_ int sd_radv_detach_event(sd_radv *ra) {
  78
  79         assert_return(ra, -EINVAL);
  80
  81         ra->event = sd_event_unref(ra->event);
  82         return 0;
  83 }
  84
  85 _public_ sd_event *sd_radv_get_event(sd_radv *ra) {
  86         assert_return(ra, NULL);
  87
  88         return ra->event;
  89 }
  90
  91 static void radv_reset(sd_radv *ra) {
  92
  93         ra->timeout_event_source =
  94                 sd_event_source_unref(ra->timeout_event_source);
  95
  96         ra->recv_event_source =
  97                 sd_event_source_unref(ra->recv_event_source);
  98
  99         ra->ra_sent = 0;
 100 }
 101
 102 _public_ sd_radv *sd_radv_ref(sd_radv *ra) {
 103         if (!ra)
 104                 return NULL;
 105
 106         assert(ra->n_ref > 0);
 107         ra->n_ref++;
 108
 109         return ra;
 110 }
 111
 112 _public_ sd_radv *sd_radv_unref(sd_radv *ra) {
 113         if (!ra)
 114                 return NULL;
 115
 116         assert(ra->n_ref > 0);
 117         ra->n_ref--;
 118
 119         if (ra->n_ref > 0)
 120                 return NULL;
 121
 122         while (ra->prefixes) {
 123                 sd_radv_prefix *p = ra->prefixes;
 124
 125                 LIST_REMOVE(prefix, ra->prefixes, p);
 126                 sd_radv_prefix_unref(p);
 127         }
 128
 129         free(ra->rdnss);
 130
 131         radv_reset(ra);
 132
 133         sd_radv_detach_event(ra);
 134         return mfree(ra);
 135 }
 136
 137 static int radv_send(sd_radv *ra, const struct in6_addr *dst,
 138                      const uint32_t router_lifetime) {
 139         static const struct ether_addr mac_zero = {};
 140         sd_radv_prefix *p;
 141         struct sockaddr_in6 dst_addr = {
 142                 .sin6_family = AF_INET6,
 143                 .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT,
 144         };
 145         struct nd_router_advert adv = {};
 146         struct {
 147                 struct nd_opt_hdr opthdr;
 148                 struct ether_addr slladdr;
 149         } _packed_ opt_mac = {
 150                 .opthdr = {
 151                         .nd_opt_type = ND_OPT_SOURCE_LINKADDR,
 152                         .nd_opt_len = (sizeof(struct nd_opt_hdr) +
 153                                        sizeof(struct ether_addr) - 1) /8 + 1,
 154                 },
 155         };
 156         struct nd_opt_mtu opt_mtu =  {
 157                 .nd_opt_mtu_type = ND_OPT_MTU,
 158                 .nd_opt_mtu_len = 1,
 159         };
 160         /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, RDNSS */
 161         struct iovec iov[4 + ra->n_prefixes];
 162         struct msghdr msg = {
 163                 .msg_name = &dst_addr,
 164                 .msg_namelen = sizeof(dst_addr),
 165                 .msg_iov = iov,
 166         };
 167
 168         if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst))
 169                 dst_addr.sin6_addr = *dst;
 170
 171         adv.nd_ra_type = ND_ROUTER_ADVERT;
 172         adv.nd_ra_curhoplimit = ra->hop_limit;
 173         adv.nd_ra_flags_reserved = ra->flags;
 174         adv.nd_ra_router_lifetime = htobe16(router_lifetime);
 175         iov[msg.msg_iovlen].iov_base = &adv;
 176         iov[msg.msg_iovlen].iov_len = sizeof(adv);
 177         msg.msg_iovlen++;
 178
 179         /* MAC address is optional, either because the link does not use L2
 180            addresses or load sharing is desired. See RFC 4861, Section 4.2 */
 181         if (memcmp(&mac_zero, &ra->mac_addr, sizeof(mac_zero))) {
 182                 opt_mac.slladdr = ra->mac_addr;
 183                 iov[msg.msg_iovlen].iov_base = &opt_mac;
 184                 iov[msg.msg_iovlen].iov_len = sizeof(opt_mac);
 185                 msg.msg_iovlen++;
 186         }
 187
 188         if (ra->mtu) {
 189                 opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu);
 190                 iov[msg.msg_iovlen].iov_base = &opt_mtu;
 191                 iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu);
 192                 msg.msg_iovlen++;
 193         }
 194
 195         LIST_FOREACH(prefix, p, ra->prefixes) {
 196                 iov[msg.msg_iovlen].iov_base = &p->opt;
 197                 iov[msg.msg_iovlen].iov_len = sizeof(p->opt);
 198                 msg.msg_iovlen++;
 199         }
 200
 201         if (ra->rdnss) {
 202                 iov[msg.msg_iovlen].iov_base = ra->rdnss;
 203                 iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8;
 204                 msg.msg_iovlen++;
 205         }
 206
 207         if (sendmsg(ra->fd, &msg, 0) < 0)
 208                 return -errno;
 209
 210         return 0;
 211 }
 212
 213 static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 214         sd_radv *ra = userdata;
 215         _cleanup_free_ char *addr = NULL;
 216         struct in6_addr src;
 217         triple_timestamp timestamp;
 218         int r;
 219         ssize_t buflen;
 220         _cleanup_free_ char *buf = NULL;
 221
 222         assert(s);
 223         assert(ra);
 224         assert(ra->event);
 225
 226         buflen = next_datagram_size_fd(fd);
 227
 228         if ((unsigned) buflen < sizeof(struct nd_router_solicit))
 229                 return log_radv("Too short packet received");
 230
 231         buf = new0(char, buflen);
 232         if (!buf)
 233                 return 0;
 234
 235         r = icmp6_receive(fd, buf, buflen, &src, &timestamp);
 236         if (r < 0) {
 237                 switch (r) {
 238                 case -EADDRNOTAVAIL:
 239                         (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr);
 240                         log_radv("Received RS from non-link-local address %s. Ignoring", addr);
 241                         break;
 242
 243                 case -EMULTIHOP:
 244                         log_radv("Received RS with invalid hop limit. Ignoring.");
 245                         break;
 246
 247                 case -EPFNOSUPPORT:
 248                         log_radv("Received invalid source address from ICMPv6 socket. Ignoring.");
 249                         break;
 250
 251                 default:
 252                         log_radv_warning_errno(r, "Error receiving from ICMPv6 socket: %m");
 253                         break;
 254                 }
 255
 256                 return 0;
 257         }
 258
 259         (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr);
 260
 261         r = radv_send(ra, &src, ra->lifetime);
 262         if (r < 0)
 263                 log_radv_warning_errno(r, "Unable to send solicited Router Advertisment to %s: %m", addr);
 264         else
 265                 log_radv("Sent solicited Router Advertisement to %s", addr);
 266
 267         return 0;
 268 }
 269
 270 static usec_t radv_compute_timeout(usec_t min, usec_t max) {
 271         assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC);
 272
 273         return min + (random_u32() % (max - min));
 274 }
 275
 276 static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
 277         int r;
 278         sd_radv *ra = userdata;
 279         usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC;
 280         usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC;
 281         usec_t time_now, timeout;
 282         char time_string[FORMAT_TIMESPAN_MAX];
 283
 284         assert(s);
 285         assert(ra);
 286         assert(ra->event);
 287
 288         ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source);
 289
 290         r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now);
 291         if (r < 0)
 292                 goto fail;
 293
 294         r = radv_send(ra, NULL, ra->lifetime);
 295         if (r < 0)
 296                 log_radv_warning_errno(r, "Unable to send Router Advertisement: %m");
 297
 298         /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */
 299         if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) {
 300                 max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC;
 301                 min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3;
 302         }
 303
 304         timeout = radv_compute_timeout(min_timeout, max_timeout);
 305
 306         log_radv("Next Router Advertisement in %s",
 307                  format_timespan(time_string, FORMAT_TIMESPAN_MAX,
 308                                  timeout, USEC_PER_SEC));
 309
 310         r = sd_event_add_time(ra->event, &ra->timeout_event_source,
 311                               clock_boottime_or_monotonic(),
 312                               time_now + timeout, MSEC_PER_SEC,
 313                               radv_timeout, ra);
 314         if (r < 0)
 315                 goto fail;
 316
 317         r = sd_event_source_set_priority(ra->timeout_event_source,
 318                                          ra->event_priority);
 319         if (r < 0)
 320                 goto fail;
 321
 322         r = sd_event_source_set_description(ra->timeout_event_source,
 323                                             "radv-timeout");
 324         if (r < 0)
 325                 goto fail;
 326
 327         ra->ra_sent++;
 328
 329 fail:
 330         if (r < 0)
 331                 sd_radv_stop(ra);
 332
 333         return 0;
 334 }
 335
 336 _public_ int sd_radv_stop(sd_radv *ra) {
 337         int r;
 338
 339         assert_return(ra, -EINVAL);
 340
 341         log_radv("Stopping IPv6 Router Advertisement daemon");
 342
 343         /* RFC 4861, Section 6.2.5, send at least one Router Advertisement
 344            with zero lifetime  */
 345         r = radv_send(ra, NULL, 0);
 346         if (r < 0)
 347                 log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m");
 348
 349         radv_reset(ra);
 350         ra->fd = safe_close(ra->fd);
 351         ra->state = SD_RADV_STATE_IDLE;
 352
 353         return 0;
 354 }
 355
 356 _public_ int sd_radv_start(sd_radv *ra) {
 357         int r = 0;
 358
 359         assert_return(ra, -EINVAL);
 360         assert_return(ra->event, -EINVAL);
 361         assert_return(ra->ifindex > 0, -EINVAL);
 362
 363         if (ra->state != SD_RADV_STATE_IDLE)
 364                 return 0;
 365
 366         r = sd_event_add_time(ra->event, &ra->timeout_event_source,
 367                               clock_boottime_or_monotonic(), 0, 0,
 368                               radv_timeout, ra);
 369         if (r < 0)
 370                 goto fail;
 371
 372         r = sd_event_source_set_priority(ra->timeout_event_source,
 373                                          ra->event_priority);
 374         if (r < 0)
 375                 goto fail;
 376
 377         (void) sd_event_source_set_description(ra->timeout_event_source,
 378                                                "radv-timeout");
 379
 380         r = icmp6_bind_router_advertisement(ra->ifindex);
 381         if (r < 0)
 382                 goto fail;
 383
 384         ra->fd = r;
 385
 386         r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra);
 387         if (r < 0)
 388                 goto fail;
 389
 390         r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority);
 391         if (r < 0)
 392                 goto fail;
 393
 394         (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message");
 395
 396         ra->state = SD_RADV_STATE_ADVERTISING;
 397
 398         log_radv("Started IPv6 Router Advertisement daemon");
 399
 400         return 0;
 401
 402  fail:
 403         radv_reset(ra);
 404
 405         return r;
 406 }
 407
 408 _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) {
 409         assert_return(ra, -EINVAL);
 410         assert_return(ifindex >= -1, -EINVAL);
 411
 412         if (ra->state != SD_RADV_STATE_IDLE)
 413                 return -EBUSY;
 414
 415         ra->ifindex = ifindex;
 416
 417         return 0;
 418 }
 419
 420 _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) {
 421         assert_return(ra, -EINVAL);
 422
 423         if (ra->state != SD_RADV_STATE_IDLE)
 424                 return -EBUSY;
 425
 426         if (mac_addr)
 427                 ra->mac_addr = *mac_addr;
 428         else
 429                 zero(ra->mac_addr);
 430
 431         return 0;
 432 }
 433
 434 _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) {
 435         assert_return(ra, -EINVAL);
 436         assert_return(mtu >= 1280, -EINVAL);
 437
 438         if (ra->state != SD_RADV_STATE_IDLE)
 439                 return -EBUSY;
 440
 441         ra->mtu = mtu;
 442
 443         return 0;
 444 }
 445
 446 _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) {
 447         assert_return(ra, -EINVAL);
 448
 449         if (ra->state != SD_RADV_STATE_IDLE)
 450                 return -EBUSY;
 451
 452         ra->hop_limit = hop_limit;
 453
 454         return 0;
 455 }
 456
 457 _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) {
 458         assert_return(ra, -EINVAL);
 459
 460         if (ra->state != SD_RADV_STATE_IDLE)
 461                 return -EBUSY;
 462
 463         /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the
 464            preference value MUST be set to (00) by the sender..." */
 465         if (router_lifetime == 0 &&
 466             (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3))
 467                 return -ETIME;
 468
 469         ra->lifetime = router_lifetime;
 470
 471         return 0;
 472 }
 473
 474 _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) {
 475         assert_return(ra, -EINVAL);
 476
 477         if (ra->state != SD_RADV_STATE_IDLE)
 478                 return -EBUSY;
 479
 480         SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed);
 481
 482         return 0;
 483 }
 484
 485 _public_ int sd_radv_set_other_information(sd_radv *ra, int other) {
 486         assert_return(ra, -EINVAL);
 487
 488         if (ra->state != SD_RADV_STATE_IDLE)
 489                 return -EBUSY;
 490
 491         SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other);
 492
 493         return 0;
 494 }
 495
 496 _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) {
 497         int r = 0;
 498
 499         assert_return(ra, -EINVAL);
 500         assert_return(IN_SET(preference,
 501                              SD_NDISC_PREFERENCE_LOW,
 502                              SD_NDISC_PREFERENCE_MEDIUM,
 503                              SD_NDISC_PREFERENCE_HIGH), -EINVAL);
 504
 505         ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3);
 506
 507         return r;
 508 }
 509
 510 _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p) {
 511         sd_radv_prefix *cur;
 512         _cleanup_free_ char *addr_p = NULL;
 513
 514         assert_return(ra, -EINVAL);
 515
 516         if (!p)
 517                 return -EINVAL;
 518
 519         LIST_FOREACH(prefix, cur, ra->prefixes) {
 520                 int r;
 521
 522                 r = in_addr_prefix_intersect(AF_INET6,
 523                                              (union in_addr_union*) &cur->opt.in6_addr,
 524                                              cur->opt.prefixlen,
 525                                              (union in_addr_union*) &p->opt.in6_addr,
 526                                              p->opt.prefixlen);
 527                 if (r > 0) {
 528                         _cleanup_free_ char *addr_cur = NULL;
 529
 530                         (void) in_addr_to_string(AF_INET6,
 531                                                  (union in_addr_union*) &cur->opt.in6_addr,
 532                                                  &addr_cur);
 533                         (void) in_addr_to_string(AF_INET6,
 534                                                  (union in_addr_union*) &p->opt.in6_addr,
 535                                                  &addr_p);
 536
 537                         log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u",
 538                                  addr_cur, cur->opt.prefixlen,
 539                                  addr_p, p->opt.prefixlen);
 540
 541                         return -EEXIST;
 542                 }
 543         }
 544
 545         p = sd_radv_prefix_ref(p);
 546
 547         LIST_APPEND(prefix, ra->prefixes, p);
 548
 549         ra->n_prefixes++;
 550
 551         (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p);
 552         log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen);
 553
 554         return 0;
 555 }
 556
 557 _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime,
 558                                const struct in6_addr *dns, size_t n_dns) {
 559         _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL;
 560         size_t len;
 561
 562         assert_return(ra, -EINVAL);
 563         assert_return(n_dns < 128, -EINVAL);
 564
 565         if (!dns || n_dns == 0) {
 566                 ra->rdnss = mfree(ra->rdnss);
 567                 ra->n_rdnss = 0;
 568
 569                 return 0;
 570         }
 571
 572         len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns;
 573
 574         opt_rdnss = malloc0(len);
 575         if (!opt_rdnss)
 576                 return -ENOMEM;
 577
 578         opt_rdnss->type = SD_RADV_OPT_RDNSS;
 579         opt_rdnss->length = len / 8;
 580         opt_rdnss->lifetime = htobe32(lifetime);
 581
 582         memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr));
 583
 584         free(ra->rdnss);
 585         ra->rdnss = opt_rdnss;
 586         opt_rdnss = NULL;
 587
 588         ra->n_rdnss = n_dns;
 589
 590         return 0;
 591 }
 592
 593 _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) {
 594         _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
 595
 596         assert_return(ret, -EINVAL);
 597
 598         p = new0(sd_radv_prefix, 1);
 599         if (!p)
 600                 return -ENOMEM;
 601
 602         p->n_ref = 1;
 603
 604         p->opt.type = ND_OPT_PREFIX_INFORMATION;
 605         p->opt.length = (sizeof(p->opt) - 1) /8 + 1;
 606
 607         p->opt.prefixlen = 64;
 608
 609         /* RFC 4861, Section 6.2.1 */
 610         SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true);
 611         SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true);
 612         p->opt.preferred_lifetime = htobe32(604800);
 613         p->opt.valid_lifetime = htobe32(2592000);
 614
 615         LIST_INIT(prefix, p);
 616
 617         *ret = p;
 618         p = NULL;
 619
 620         return 0;
 621 }
 622
 623 _public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) {
 624         if (!p)
 625                 return NULL;
 626
 627         assert(p->n_ref > 0);
 628         p->n_ref++;
 629
 630         return p;
 631 }
 632
 633 _public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) {
 634         if (!p)
 635                 return NULL;
 636
 637         assert(p->n_ref > 0);
 638         p->n_ref--;
 639
 640         if (p->n_ref > 0)
 641                 return NULL;
 642
 643         return mfree(p);
 644 }
 645
 646 _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, struct in6_addr *in6_addr,
 647                                        unsigned char prefixlen) {
 648         assert_return(p, -EINVAL);
 649         assert_return(in6_addr, -EINVAL);
 650
 651         if (prefixlen < 3 || prefixlen > 128)
 652                 return -EINVAL;
 653
 654         if (prefixlen > 64)
 655                 /* unusual but allowed, log it */
 656                 log_radv("Unusual prefix length %d greater than 64", prefixlen);
 657
 658         p->opt.in6_addr = *in6_addr;
 659         p->opt.prefixlen = prefixlen;
 660
 661         return 0;
 662 }
 663
 664 _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) {
 665         assert_return(p, -EINVAL);
 666
 667         SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink);
 668
 669         return 0;
 670 }
 671
 672 _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p,
 673                                                           int address_autoconfiguration) {
 674         assert_return(p, -EINVAL);
 675
 676         SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration);
 677
 678         return 0;
 679 }
 680
 681 _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p,
 682                                                uint32_t valid_lifetime) {
 683         assert_return(p, -EINVAL);
 684
 685         p->opt.valid_lifetime = htobe32(valid_lifetime);
 686
 687         return 0;
 688 }
 689
 690 _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p,
 691                                                    uint32_t preferred_lifetime) {
 692         assert_return(p, -EINVAL);
 693
 694         p->opt.preferred_lifetime = htobe32(preferred_lifetime);
 695
 696         return 0;
 697 }