src/libsystemd/sd-netlink/rtnl-message.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Tom Gundersen <teg@jklm.no>
   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/in.h>
  21 #include <linux/if_addrlabel.h>
  22 #include <stdbool.h>
  23 #include <unistd.h>
  24
  25 #include "sd-netlink.h"
  26
  27 #include "format-util.h"
  28 #include "missing.h"
  29 #include "netlink-internal.h"
  30 #include "netlink-types.h"
  31 #include "netlink-util.h"
  32 #include "refcnt.h"
  33 #include "socket-util.h"
  34 #include "util.h"
  35
  36 int sd_rtnl_message_route_set_dst_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
  37         struct rtmsg *rtm;
  38
  39         assert_return(m, -EINVAL);
  40         assert_return(m->hdr, -EINVAL);
  41         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
  42
  43         rtm = NLMSG_DATA(m->hdr);
  44
  45         if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
  46             (rtm->rtm_family == AF_INET6 && prefixlen > 128))
  47                 return -ERANGE;
  48
  49         rtm->rtm_dst_len = prefixlen;
  50
  51         return 0;
  52 }
  53
  54 int sd_rtnl_message_route_set_src_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
  55         struct rtmsg *rtm;
  56
  57         assert_return(m, -EINVAL);
  58         assert_return(m->hdr, -EINVAL);
  59         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
  60
  61         rtm = NLMSG_DATA(m->hdr);
  62
  63         if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
  64             (rtm->rtm_family == AF_INET6 && prefixlen > 128))
  65                 return -ERANGE;
  66
  67         rtm->rtm_src_len = prefixlen;
  68
  69         return 0;
  70 }
  71
  72 int sd_rtnl_message_route_set_scope(sd_netlink_message *m, unsigned char scope) {
  73         struct rtmsg *rtm;
  74
  75         assert_return(m, -EINVAL);
  76         assert_return(m->hdr, -EINVAL);
  77         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
  78
  79         rtm = NLMSG_DATA(m->hdr);
  80
  81         rtm->rtm_scope = scope;
  82
  83         return 0;
  84 }
  85
  86 int sd_rtnl_message_route_set_flags(sd_netlink_message *m, unsigned flags) {
  87         struct rtmsg *rtm;
  88
  89         assert_return(m, -EINVAL);
  90         assert_return(m->hdr, -EINVAL);
  91         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
  92
  93         rtm = NLMSG_DATA(m->hdr);
  94
  95         rtm->rtm_flags = flags;
  96
  97         return 0;
  98 }
  99
 100 int sd_rtnl_message_route_get_flags(sd_netlink_message *m, unsigned *flags) {
 101         struct rtmsg *rtm;
 102
 103         assert_return(m, -EINVAL);
 104         assert_return(m->hdr, -EINVAL);
 105         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 106         assert_return(flags, -EINVAL);
 107
 108         rtm = NLMSG_DATA(m->hdr);
 109
 110         *flags = rtm->rtm_flags;
 111
 112         return 0;
 113 }
 114
 115 int sd_rtnl_message_route_set_table(sd_netlink_message *m, unsigned char table) {
 116         struct rtmsg *rtm;
 117
 118         assert_return(m, -EINVAL);
 119         assert_return(m->hdr, -EINVAL);
 120         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 121
 122         rtm = NLMSG_DATA(m->hdr);
 123
 124         rtm->rtm_table = table;
 125
 126         return 0;
 127 }
 128
 129 int sd_rtnl_message_route_get_family(sd_netlink_message *m, int *family) {
 130         struct rtmsg *rtm;
 131
 132         assert_return(m, -EINVAL);
 133         assert_return(m->hdr, -EINVAL);
 134         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 135         assert_return(family, -EINVAL);
 136
 137         rtm = NLMSG_DATA(m->hdr);
 138
 139         *family = rtm->rtm_family;
 140
 141         return 0;
 142 }
 143
 144 int sd_rtnl_message_route_set_family(sd_netlink_message *m, int family) {
 145         struct rtmsg *rtm;
 146
 147         assert_return(m, -EINVAL);
 148         assert_return(m->hdr, -EINVAL);
 149         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 150
 151         rtm = NLMSG_DATA(m->hdr);
 152
 153         rtm->rtm_family = family;
 154
 155         return 0;
 156 }
 157
 158 int sd_rtnl_message_route_get_protocol(sd_netlink_message *m, unsigned char *protocol) {
 159         struct rtmsg *rtm;
 160
 161         assert_return(m, -EINVAL);
 162         assert_return(m->hdr, -EINVAL);
 163         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 164         assert_return(protocol, -EINVAL);
 165
 166         rtm = NLMSG_DATA(m->hdr);
 167
 168         *protocol = rtm->rtm_protocol;
 169
 170         return 0;
 171 }
 172
 173 int sd_rtnl_message_route_get_scope(sd_netlink_message *m, unsigned char *scope) {
 174         struct rtmsg *rtm;
 175
 176         assert_return(m, -EINVAL);
 177         assert_return(m->hdr, -EINVAL);
 178         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 179         assert_return(scope, -EINVAL);
 180
 181         rtm = NLMSG_DATA(m->hdr);
 182
 183         *scope = rtm->rtm_scope;
 184
 185         return 0;
 186 }
 187
 188 int sd_rtnl_message_route_get_tos(sd_netlink_message *m, unsigned char *tos) {
 189         struct rtmsg *rtm;
 190
 191         assert_return(m, -EINVAL);
 192         assert_return(m->hdr, -EINVAL);
 193         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 194         assert_return(tos, -EINVAL);
 195
 196         rtm = NLMSG_DATA(m->hdr);
 197
 198         *tos = rtm->rtm_tos;
 199
 200         return 0;
 201 }
 202
 203 int sd_rtnl_message_route_get_table(sd_netlink_message *m, unsigned char *table) {
 204         struct rtmsg *rtm;
 205
 206         assert_return(m, -EINVAL);
 207         assert_return(m->hdr, -EINVAL);
 208         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 209         assert_return(table, -EINVAL);
 210
 211         rtm = NLMSG_DATA(m->hdr);
 212
 213         *table = rtm->rtm_table;
 214
 215         return 0;
 216 }
 217
 218 int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char *dst_len) {
 219         struct rtmsg *rtm;
 220
 221         assert_return(m, -EINVAL);
 222         assert_return(m->hdr, -EINVAL);
 223         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 224         assert_return(dst_len, -EINVAL);
 225
 226         rtm = NLMSG_DATA(m->hdr);
 227
 228         *dst_len = rtm->rtm_dst_len;
 229
 230         return 0;
 231 }
 232
 233 int sd_rtnl_message_route_get_src_prefixlen(sd_netlink_message *m, unsigned char *src_len) {
 234         struct rtmsg *rtm;
 235
 236         assert_return(m, -EINVAL);
 237         assert_return(m->hdr, -EINVAL);
 238         assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
 239         assert_return(src_len, -EINVAL);
 240
 241         rtm = NLMSG_DATA(m->hdr);
 242
 243         *src_len = rtm->rtm_src_len;
 244
 245         return 0;
 246 }
 247
 248 int sd_rtnl_message_new_route(sd_netlink *rtnl, sd_netlink_message **ret,
 249                               uint16_t nlmsg_type, int rtm_family,
 250                               unsigned char rtm_protocol) {
 251         struct rtmsg *rtm;
 252         int r;
 253
 254         assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL);
 255         assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) ||
 256                       rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
 257         assert_return(ret, -EINVAL);
 258
 259         r = message_new(rtnl, ret, nlmsg_type);
 260         if (r < 0)
 261                 return r;
 262
 263         if (nlmsg_type == RTM_NEWROUTE)
 264                 (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
 265
 266         rtm = NLMSG_DATA((*ret)->hdr);
 267
 268         rtm->rtm_family = rtm_family;
 269         rtm->rtm_scope = RT_SCOPE_UNIVERSE;
 270         rtm->rtm_type = RTN_UNICAST;
 271         rtm->rtm_table = RT_TABLE_MAIN;
 272         rtm->rtm_protocol = rtm_protocol;
 273
 274         return 0;
 275 }
 276
 277 int sd_rtnl_message_neigh_set_flags(sd_netlink_message *m, uint8_t flags) {
 278         struct ndmsg *ndm;
 279
 280         assert_return(m, -EINVAL);
 281         assert_return(m->hdr, -EINVAL);
 282         assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
 283
 284         ndm = NLMSG_DATA(m->hdr);
 285         ndm->ndm_flags |= flags;
 286
 287         return 0;
 288 }
 289
 290 int sd_rtnl_message_neigh_set_state(sd_netlink_message *m, uint16_t state) {
 291         struct ndmsg *ndm;
 292
 293         assert_return(m, -EINVAL);
 294         assert_return(m->hdr, -EINVAL);
 295         assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
 296
 297         ndm = NLMSG_DATA(m->hdr);
 298         ndm->ndm_state |= state;
 299
 300         return 0;
 301 }
 302
 303 int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags) {
 304         struct ndmsg *ndm;
 305
 306         assert_return(m, -EINVAL);
 307         assert_return(m->hdr, -EINVAL);
 308         assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
 309
 310         ndm = NLMSG_DATA(m->hdr);
 311         *flags = ndm->ndm_flags;
 312
 313         return 0;
 314 }
 315
 316 int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state) {
 317         struct ndmsg *ndm;
 318
 319         assert_return(m, -EINVAL);
 320         assert_return(m->hdr, -EINVAL);
 321         assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
 322
 323         ndm = NLMSG_DATA(m->hdr);
 324         *state = ndm->ndm_state;
 325
 326         return 0;
 327 }
 328
 329 int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family) {
 330         struct ndmsg *ndm;
 331
 332         assert_return(m, -EINVAL);
 333         assert_return(m->hdr, -EINVAL);
 334         assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
 335         assert_return(family, -EINVAL);
 336
 337         ndm = NLMSG_DATA(m->hdr);
 338
 339         *family = ndm->ndm_family;
 340
 341         return 0;
 342 }
 343
 344 int sd_rtnl_message_neigh_get_ifindex(sd_netlink_message *m, int *index) {
 345         struct ndmsg *ndm;
 346
 347         assert_return(m, -EINVAL);
 348         assert_return(m->hdr, -EINVAL);
 349         assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
 350         assert_return(index, -EINVAL);
 351
 352         ndm = NLMSG_DATA(m->hdr);
 353
 354         *index = ndm->ndm_ifindex;
 355
 356         return 0;
 357 }
 358
 359 int sd_rtnl_message_new_neigh(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int index, int ndm_family) {
 360         struct ndmsg *ndm;
 361         int r;
 362
 363         assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL);
 364         assert_return(ndm_family == AF_INET  ||
 365                       ndm_family == AF_INET6 ||
 366                       ndm_family == PF_BRIDGE, -EINVAL);
 367         assert_return(ret, -EINVAL);
 368
 369         r = message_new(rtnl, ret, nlmsg_type);
 370         if (r < 0)
 371                 return r;
 372
 373         if (nlmsg_type == RTM_NEWNEIGH)
 374                 (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
 375
 376         ndm = NLMSG_DATA((*ret)->hdr);
 377
 378         ndm->ndm_family = ndm_family;
 379         ndm->ndm_ifindex = index;
 380
 381         return 0;
 382 }
 383
 384 int sd_rtnl_message_link_set_flags(sd_netlink_message *m, unsigned flags, unsigned change) {
 385         struct ifinfomsg *ifi;
 386
 387         assert_return(m, -EINVAL);
 388         assert_return(m->hdr, -EINVAL);
 389         assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
 390         assert_return(change, -EINVAL);
 391
 392         ifi = NLMSG_DATA(m->hdr);
 393
 394         ifi->ifi_flags = flags;
 395         ifi->ifi_change = change;
 396
 397         return 0;
 398 }
 399
 400 int sd_rtnl_message_link_set_type(sd_netlink_message *m, unsigned type) {
 401         struct ifinfomsg *ifi;
 402
 403         assert_return(m, -EINVAL);
 404         assert_return(m->hdr, -EINVAL);
 405         assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
 406
 407         ifi = NLMSG_DATA(m->hdr);
 408
 409         ifi->ifi_type = type;
 410
 411         return 0;
 412 }
 413
 414 int sd_rtnl_message_link_set_family(sd_netlink_message *m, unsigned family) {
 415         struct ifinfomsg *ifi;
 416
 417         assert_return(m, -EINVAL);
 418         assert_return(m->hdr, -EINVAL);
 419         assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
 420
 421         ifi = NLMSG_DATA(m->hdr);
 422
 423         ifi->ifi_family = family;
 424
 425         return 0;
 426 }
 427
 428 int sd_rtnl_message_new_link(sd_netlink *rtnl, sd_netlink_message **ret,
 429                              uint16_t nlmsg_type, int index) {
 430         struct ifinfomsg *ifi;
 431         int r;
 432
 433         assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL);
 434         assert_return(ret, -EINVAL);
 435
 436         r = message_new(rtnl, ret, nlmsg_type);
 437         if (r < 0)
 438                 return r;
 439
 440         if (nlmsg_type == RTM_NEWLINK)
 441                 (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
 442
 443         ifi = NLMSG_DATA((*ret)->hdr);
 444
 445         ifi->ifi_family = AF_UNSPEC;
 446         ifi->ifi_index = index;
 447
 448         return 0;
 449 }
 450
 451 int sd_rtnl_message_addr_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
 452         struct ifaddrmsg *ifa;
 453
 454         assert_return(m, -EINVAL);
 455         assert_return(m->hdr, -EINVAL);
 456         assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
 457
 458         ifa = NLMSG_DATA(m->hdr);
 459
 460         if ((ifa->ifa_family == AF_INET && prefixlen > 32) ||
 461             (ifa->ifa_family == AF_INET6 && prefixlen > 128))
 462                 return -ERANGE;
 463
 464         ifa->ifa_prefixlen = prefixlen;
 465
 466         return 0;
 467 }
 468
 469 int sd_rtnl_message_addr_set_flags(sd_netlink_message *m, unsigned char flags) {
 470         struct ifaddrmsg *ifa;
 471
 472         assert_return(m, -EINVAL);
 473         assert_return(m->hdr, -EINVAL);
 474         assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
 475
 476         ifa = NLMSG_DATA(m->hdr);
 477
 478         ifa->ifa_flags = flags;
 479
 480         return 0;
 481 }
 482
 483 int sd_rtnl_message_addr_set_scope(sd_netlink_message *m, unsigned char scope) {
 484         struct ifaddrmsg *ifa;
 485
 486         assert_return(m, -EINVAL);
 487         assert_return(m->hdr, -EINVAL);
 488         assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
 489
 490         ifa = NLMSG_DATA(m->hdr);
 491
 492         ifa->ifa_scope = scope;
 493
 494         return 0;
 495 }
 496
 497 int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family) {
 498         struct ifaddrmsg *ifa;
 499
 500         assert_return(m, -EINVAL);
 501         assert_return(m->hdr, -EINVAL);
 502         assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
 503         assert_return(family, -EINVAL);
 504
 505         ifa = NLMSG_DATA(m->hdr);
 506
 507         *family = ifa->ifa_family;
 508
 509         return 0;
 510 }
 511
 512 int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen) {
 513         struct ifaddrmsg *ifa;
 514
 515         assert_return(m, -EINVAL);
 516         assert_return(m->hdr, -EINVAL);
 517         assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
 518         assert_return(prefixlen, -EINVAL);
 519
 520         ifa = NLMSG_DATA(m->hdr);
 521
 522         *prefixlen = ifa->ifa_prefixlen;
 523
 524         return 0;
 525 }
 526
 527 int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope) {
 528         struct ifaddrmsg *ifa;
 529
 530         assert_return(m, -EINVAL);
 531         assert_return(m->hdr, -EINVAL);
 532         assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
 533         assert_return(scope, -EINVAL);
 534
 535         ifa = NLMSG_DATA(m->hdr);
 536
 537         *scope = ifa->ifa_scope;
 538
 539         return 0;
 540 }
 541
 542 int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags) {
 543         struct ifaddrmsg *ifa;
 544
 545         assert_return(m, -EINVAL);
 546         assert_return(m->hdr, -EINVAL);
 547         assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
 548         assert_return(flags, -EINVAL);
 549
 550         ifa = NLMSG_DATA(m->hdr);
 551
 552         *flags = ifa->ifa_flags;
 553
 554         return 0;
 555 }
 556
 557 int sd_rtnl_message_addr_get_ifindex(sd_netlink_message *m, int *ifindex) {
 558         struct ifaddrmsg *ifa;
 559
 560         assert_return(m, -EINVAL);
 561         assert_return(m->hdr, -EINVAL);
 562         assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
 563         assert_return(ifindex, -EINVAL);
 564
 565         ifa = NLMSG_DATA(m->hdr);
 566
 567         *ifindex = ifa->ifa_index;
 568
 569         return 0;
 570 }
 571
 572 int sd_rtnl_message_new_addr(sd_netlink *rtnl, sd_netlink_message **ret,
 573                              uint16_t nlmsg_type, int index,
 574                              int family) {
 575         struct ifaddrmsg *ifa;
 576         int r;
 577
 578         assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL);
 579         assert_return((nlmsg_type == RTM_GETADDR && index == 0) ||
 580                       index > 0, -EINVAL);
 581         assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) ||
 582                       family == AF_INET || family == AF_INET6, -EINVAL);
 583         assert_return(ret, -EINVAL);
 584
 585         r = message_new(rtnl, ret, nlmsg_type);
 586         if (r < 0)
 587                 return r;
 588
 589         if (nlmsg_type == RTM_GETADDR)
 590                 (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP;
 591
 592         ifa = NLMSG_DATA((*ret)->hdr);
 593
 594         ifa->ifa_index = index;
 595         ifa->ifa_family = family;
 596         if (family == AF_INET)
 597                 ifa->ifa_prefixlen = 32;
 598         else if (family == AF_INET6)
 599                 ifa->ifa_prefixlen = 128;
 600
 601         return 0;
 602 }
 603
 604 int sd_rtnl_message_new_addr_update(sd_netlink *rtnl, sd_netlink_message **ret,
 605                              int index, int family) {
 606         int r;
 607
 608         r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family);
 609         if (r < 0)
 610                 return r;
 611
 612         (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE;
 613
 614         return 0;
 615 }
 616
 617 int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex) {
 618         struct ifinfomsg *ifi;
 619
 620         assert_return(m, -EINVAL);
 621         assert_return(m->hdr, -EINVAL);
 622         assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
 623         assert_return(ifindex, -EINVAL);
 624
 625         ifi = NLMSG_DATA(m->hdr);
 626
 627         *ifindex = ifi->ifi_index;
 628
 629         return 0;
 630 }
 631
 632 int sd_rtnl_message_link_get_flags(sd_netlink_message *m, unsigned *flags) {
 633         struct ifinfomsg *ifi;
 634
 635         assert_return(m, -EINVAL);
 636         assert_return(m->hdr, -EINVAL);
 637         assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
 638         assert_return(flags, -EINVAL);
 639
 640         ifi = NLMSG_DATA(m->hdr);
 641
 642         *flags = ifi->ifi_flags;
 643
 644         return 0;
 645 }
 646
 647 int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned short *type) {
 648         struct ifinfomsg *ifi;
 649
 650         assert_return(m, -EINVAL);
 651         assert_return(m->hdr, -EINVAL);
 652         assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
 653         assert_return(type, -EINVAL);
 654
 655         ifi = NLMSG_DATA(m->hdr);
 656
 657         *type = ifi->ifi_type;
 658
 659         return 0;
 660 }
 661
 662 int sd_rtnl_message_get_family(sd_netlink_message *m, int *family) {
 663         assert_return(m, -EINVAL);
 664         assert_return(family, -EINVAL);
 665
 666         assert(m->hdr);
 667
 668         if (rtnl_message_type_is_link(m->hdr->nlmsg_type)) {
 669                 struct ifinfomsg *ifi;
 670
 671                 ifi = NLMSG_DATA(m->hdr);
 672
 673                 *family = ifi->ifi_family;
 674
 675                 return 0;
 676         } else if (rtnl_message_type_is_route(m->hdr->nlmsg_type)) {
 677                 struct rtmsg *rtm;
 678
 679                 rtm = NLMSG_DATA(m->hdr);
 680
 681                 *family = rtm->rtm_family;
 682
 683                 return 0;
 684         } else if (rtnl_message_type_is_neigh(m->hdr->nlmsg_type)) {
 685                 struct ndmsg *ndm;
 686
 687                 ndm = NLMSG_DATA(m->hdr);
 688
 689                 *family = ndm->ndm_family;
 690
 691                 return 0;
 692         } else if (rtnl_message_type_is_addr(m->hdr->nlmsg_type)) {
 693                 struct ifaddrmsg *ifa;
 694
 695                 ifa = NLMSG_DATA(m->hdr);
 696
 697                 *family = ifa->ifa_family;
 698
 699                 return 0;
 700         }
 701
 702         return -EOPNOTSUPP;
 703 }
 704
 705 int sd_rtnl_message_new_addrlabel(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int ifindex, int ifal_family) {
 706         struct ifaddrlblmsg *addrlabel;
 707         int r;
 708
 709         assert_return(rtnl_message_type_is_addrlabel(nlmsg_type), -EINVAL);
 710         assert_return(ret, -EINVAL);
 711
 712         r = message_new(rtnl, ret, nlmsg_type);
 713         if (r < 0)
 714                 return r;
 715
 716         if (nlmsg_type == RTM_NEWADDRLABEL)
 717                 (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
 718
 719         addrlabel = NLMSG_DATA((*ret)->hdr);
 720
 721         addrlabel->ifal_family = ifal_family;
 722         addrlabel->ifal_index = ifindex;
 723
 724         return 0;
 725 }
 726
 727 int sd_rtnl_message_addrlabel_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
 728         struct ifaddrlblmsg *addrlabel;
 729
 730         assert_return(m, -EINVAL);
 731         assert_return(m->hdr, -EINVAL);
 732         assert_return(rtnl_message_type_is_addrlabel(m->hdr->nlmsg_type), -EINVAL);
 733
 734         addrlabel = NLMSG_DATA(m->hdr);
 735
 736         if (prefixlen > 128)
 737                 return -ERANGE;
 738
 739         addrlabel->ifal_prefixlen = prefixlen;
 740
 741         return 0;
 742 }