1 /* 2 * lib/route/link.c Links (Interfaces) 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation version 2.1 7 * of the License. 8 * 9 * Copyright (c) 2003-2008 Thomas Graf <tgraf (at) suug.ch> 10 */ 11 12 /** 13 * @ingroup rtnl 14 * @defgroup link Links (Interfaces) 15 * @brief 16 * 17 * @par Link Identification 18 * A link can be identified by either its interface index or by its 19 * name. The kernel favours the interface index but falls back to the 20 * interface name if the interface index is lesser-than 0 for kernels 21 * >= 2.6.11. Therefore you can request changes without mapping a 22 * interface name to the corresponding index first. 23 * 24 * @par Changeable Attributes 25 * @anchor link_changeable 26 * - Link layer address 27 * - Link layer broadcast address 28 * - device mapping (ifmap) (>= 2.6.9) 29 * - MTU (>= 2.6.9) 30 * - Transmission queue length (>= 2.6.9) 31 * - Weight (>= 2.6.9) 32 * - Link name (only via access through interface index) (>= 2.6.9) 33 * - Flags (>= 2.6.9) 34 * - IFF_DEBUG 35 * - IFF_NOTRAILERS 36 * - IFF_NOARP 37 * - IFF_DYNAMIC 38 * - IFF_MULTICAST 39 * - IFF_PORTSEL 40 * - IFF_AUTOMEDIA 41 * - IFF_UP 42 * - IFF_PROMISC 43 * - IFF_ALLMULTI 44 * 45 * @par Link Flags (linux/if.h) 46 * @anchor link_flags 47 * @code 48 * IFF_UP Status of link (up|down) 49 * IFF_BROADCAST Indicates this link allows broadcasting 50 * IFF_MULTICAST Indicates this link allows multicasting 51 * IFF_ALLMULTI Indicates this link is doing multicast routing 52 * IFF_DEBUG Tell the driver to do debugging (currently unused) 53 * IFF_LOOPBACK This is the loopback link 54 * IFF_POINTOPOINT Point-to-point link 55 * IFF_NOARP Link is unable to perform ARP 56 * IFF_PROMISC Status of promiscious mode flag 57 * IFF_MASTER Used by teql 58 * IFF_SLAVE Used by teql 59 * IFF_PORTSEL Indicates this link allows port selection 60 * IFF_AUTOMEDIA Indicates this link selects port automatically 61 * IFF_DYNAMIC Indicates the address of this link is dynamic 62 * IFF_RUNNING Link is running and carrier is ok. 63 * IFF_NOTRAILERS Unused, BSD compat. 64 * @endcode 65 * 66 * @par Notes on IFF_PROMISC and IFF_ALLMULTI flags 67 * Although you can query the status of IFF_PROMISC and IFF_ALLMULTI 68 * they do not represent the actual state in the kernel but rather 69 * whether the flag has been enabled/disabled by userspace. The link 70 * may be in promiscious mode even if IFF_PROMISC is not set in a link 71 * dump request response because promiscity might be needed by the driver 72 * for a period of time. 73 * 74 * @note The unit of the transmission queue length depends on the 75 * link type, a common unit is \a packets. 76 * 77 * @par 1) Retrieving information about available links 78 * @code 79 * // The first step is to retrieve a list of all available interfaces within 80 * // the kernel and put them into a cache. 81 * struct nl_cache *cache = rtnl_link_alloc_cache(sk); 82 * 83 * // In a second step, a specific link may be looked up by either interface 84 * // index or interface name. 85 * struct rtnl_link *link = rtnl_link_get_by_name(cache, "lo"); 86 * 87 * // rtnl_link_get_by_name() is the short version for translating the 88 * // interface name to an interface index first like this: 89 * int ifindex = rtnl_link_name2i(cache, "lo"); 90 * struct rtnl_link *link = rtnl_link_get(cache, ifindex); 91 * 92 * // After successful usage, the object must be given back to the cache 93 * rtnl_link_put(link); 94 * @endcode 95 * 96 * @par 2) Changing link attributes 97 * @code 98 * // In order to change any attributes of an existing link, we must allocate 99 * // a new link to hold the change requests: 100 * struct rtnl_link *request = rtnl_link_alloc(); 101 * 102 * // Now we can go on and specify the attributes we want to change: 103 * rtnl_link_set_weight(request, 300); 104 * rtnl_link_set_mtu(request, 1360); 105 * 106 * // We can also shut an interface down administratively 107 * rtnl_link_unset_flags(request, rtnl_link_str2flags("up")); 108 * 109 * // Actually, we should know which link to change, so let's look it up 110 * struct rtnl_link *old = rtnl_link_get(cache, "eth0"); 111 * 112 * // Two ways exist to commit this change request, the first one is to 113 * // build the required netlink message and send it out in one single 114 * // step: 115 * rtnl_link_change(sk, old, request); 116 * 117 * // An alternative way is to build the netlink message and send it 118 * // out yourself using nl_send_auto_complete() 119 * struct nl_msg *msg = rtnl_link_build_change_request(old, request); 120 * nl_send_auto_complete(sk, nlmsg_hdr(msg)); 121 * nlmsg_free(msg); 122 * 123 * // Don't forget to give back the link object ;-> 124 * rtnl_link_put(old); 125 * @endcode 126 * 127 * @par 3) Link Type Specific Attributes 128 * @code 129 * // Some link types offer additional parameters and statistics specific 130 * // to their type. F.e. a VLAN link can be configured like this: 131 * // 132 * // Allocate a new link and set the info type to "vlan". This is required 133 * // to prepare the link to hold vlan specific attributes. 134 * struct rtnl_link *request = rtnl_link_alloc(); 135 * rtnl_link_set_info_type(request, "vlan"); 136 * 137 * // Now vlan specific attributes can be set: 138 * rtnl_link_vlan_set_id(request, 10); 139 * rtnl_link_vlan_set_ingress_map(request, 2, 8); 140 * 141 * // Of course the attributes can also be read, check the info type 142 * // to make sure you are using the right access functions: 143 * char *type = rtnl_link_get_info_type(link); 144 * if (!strcmp(type, "vlan")) 145 * int id = rtnl_link_vlan_get_id(link); 146 * @endcode 147 * @{ 148 */ 149 150 #include <netlink-local.h> 151 #include <netlink/netlink.h> 152 #include <netlink/attr.h> 153 #include <netlink/utils.h> 154 #include <netlink/object.h> 155 #include <netlink/route/rtnl.h> 156 #include <netlink/route/link.h> 157 #include <netlink/route/link/info-api.h> 158 159 /** @cond SKIP */ 160 #define LINK_ATTR_MTU 0x0001 161 #define LINK_ATTR_LINK 0x0002 162 #define LINK_ATTR_TXQLEN 0x0004 163 #define LINK_ATTR_WEIGHT 0x0008 164 #define LINK_ATTR_MASTER 0x0010 165 #define LINK_ATTR_QDISC 0x0020 166 #define LINK_ATTR_MAP 0x0040 167 #define LINK_ATTR_ADDR 0x0080 168 #define LINK_ATTR_BRD 0x0100 169 #define LINK_ATTR_FLAGS 0x0200 170 #define LINK_ATTR_IFNAME 0x0400 171 #define LINK_ATTR_IFINDEX 0x0800 172 #define LINK_ATTR_FAMILY 0x1000 173 #define LINK_ATTR_ARPTYPE 0x2000 174 #define LINK_ATTR_STATS 0x4000 175 #define LINK_ATTR_CHANGE 0x8000 176 #define LINK_ATTR_OPERSTATE 0x10000 177 #define LINK_ATTR_LINKMODE 0x20000 178 #define LINK_ATTR_LINKINFO 0x40000 179 180 static struct nl_cache_ops rtnl_link_ops; 181 static struct nl_object_ops link_obj_ops; 182 /** @endcond */ 183 184 static void release_link_info(struct rtnl_link *link) 185 { 186 struct rtnl_link_info_ops *io = link->l_info_ops; 187 188 if (io != NULL) { 189 io->io_refcnt--; 190 io->io_free(link); 191 link->l_info_ops = NULL; 192 } 193 } 194 195 static void link_free_data(struct nl_object *c) 196 { 197 struct rtnl_link *link = nl_object_priv(c); 198 199 if (link) { 200 struct rtnl_link_info_ops *io; 201 202 if ((io = link->l_info_ops) != NULL) 203 release_link_info(link); 204 205 nl_addr_put(link->l_addr); 206 nl_addr_put(link->l_bcast); 207 } 208 } 209 210 static int link_clone(struct nl_object *_dst, struct nl_object *_src) 211 { 212 struct rtnl_link *dst = nl_object_priv(_dst); 213 struct rtnl_link *src = nl_object_priv(_src); 214 int err; 215 216 if (src->l_addr) 217 if (!(dst->l_addr = nl_addr_clone(src->l_addr))) 218 return -NLE_NOMEM; 219 220 if (src->l_bcast) 221 if (!(dst->l_bcast = nl_addr_clone(src->l_bcast))) 222 return -NLE_NOMEM; 223 224 if (src->l_info_ops && src->l_info_ops->io_clone) { 225 err = src->l_info_ops->io_clone(dst, src); 226 if (err < 0) 227 return err; 228 } 229 230 return 0; 231 } 232 233 static struct nla_policy link_policy[IFLA_MAX+1] = { 234 [IFLA_IFNAME] = { .type = NLA_STRING, 235 .maxlen = IFNAMSIZ }, 236 [IFLA_MTU] = { .type = NLA_U32 }, 237 [IFLA_TXQLEN] = { .type = NLA_U32 }, 238 [IFLA_LINK] = { .type = NLA_U32 }, 239 [IFLA_WEIGHT] = { .type = NLA_U32 }, 240 [IFLA_MASTER] = { .type = NLA_U32 }, 241 [IFLA_OPERSTATE]= { .type = NLA_U8 }, 242 [IFLA_LINKMODE] = { .type = NLA_U8 }, 243 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 244 [IFLA_QDISC] = { .type = NLA_STRING, 245 .maxlen = IFQDISCSIZ }, 246 [IFLA_STATS] = { .minlen = sizeof(struct rtnl_link_stats) }, 247 [IFLA_MAP] = { .minlen = sizeof(struct rtnl_link_ifmap) }, 248 }; 249 250 static struct nla_policy link_info_policy[IFLA_INFO_MAX+1] = { 251 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 252 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 253 [IFLA_INFO_XSTATS] = { .type = NLA_NESTED }, 254 }; 255 256 static int link_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who, 257 struct nlmsghdr *n, struct nl_parser_param *pp) 258 { 259 struct rtnl_link *link; 260 struct ifinfomsg *ifi; 261 struct nlattr *tb[IFLA_MAX+1]; 262 int err; 263 264 link = rtnl_link_alloc(); 265 if (link == NULL) { 266 err = -NLE_NOMEM; 267 goto errout; 268 } 269 270 link->ce_msgtype = n->nlmsg_type; 271 272 err = nlmsg_parse(n, sizeof(*ifi), tb, IFLA_MAX, link_policy); 273 if (err < 0) 274 goto errout; 275 276 if (tb[IFLA_IFNAME] == NULL) { 277 err = -NLE_MISSING_ATTR; 278 goto errout; 279 } 280 281 nla_strlcpy(link->l_name, tb[IFLA_IFNAME], IFNAMSIZ); 282 283 ifi = nlmsg_data(n); 284 link->l_family = ifi->ifi_family; 285 link->l_arptype = ifi->ifi_type; 286 link->l_index = ifi->ifi_index; 287 link->l_flags = ifi->ifi_flags; 288 link->l_change = ifi->ifi_change; 289 link->ce_mask = (LINK_ATTR_IFNAME | LINK_ATTR_FAMILY | 290 LINK_ATTR_ARPTYPE| LINK_ATTR_IFINDEX | 291 LINK_ATTR_FLAGS | LINK_ATTR_CHANGE); 292 293 if (tb[IFLA_STATS]) { 294 struct rtnl_link_stats *st = nla_data(tb[IFLA_STATS]); 295 296 link->l_stats[RTNL_LINK_RX_PACKETS] = st->rx_packets; 297 link->l_stats[RTNL_LINK_RX_BYTES] = st->rx_bytes; 298 link->l_stats[RTNL_LINK_RX_ERRORS] = st->rx_errors; 299 link->l_stats[RTNL_LINK_RX_DROPPED] = st->rx_dropped; 300 link->l_stats[RTNL_LINK_RX_COMPRESSED] = st->rx_compressed; 301 link->l_stats[RTNL_LINK_RX_FIFO_ERR] = st->rx_fifo_errors; 302 link->l_stats[RTNL_LINK_TX_PACKETS] = st->tx_packets; 303 link->l_stats[RTNL_LINK_TX_BYTES] = st->tx_bytes; 304 link->l_stats[RTNL_LINK_TX_ERRORS] = st->tx_errors; 305 link->l_stats[RTNL_LINK_TX_DROPPED] = st->tx_dropped; 306 link->l_stats[RTNL_LINK_TX_COMPRESSED] = st->tx_compressed; 307 link->l_stats[RTNL_LINK_TX_FIFO_ERR] = st->tx_fifo_errors; 308 link->l_stats[RTNL_LINK_RX_LEN_ERR] = st->rx_length_errors; 309 link->l_stats[RTNL_LINK_RX_OVER_ERR] = st->rx_over_errors; 310 link->l_stats[RTNL_LINK_RX_CRC_ERR] = st->rx_crc_errors; 311 link->l_stats[RTNL_LINK_RX_FRAME_ERR] = st->rx_frame_errors; 312 link->l_stats[RTNL_LINK_RX_MISSED_ERR] = st->rx_missed_errors; 313 link->l_stats[RTNL_LINK_TX_ABORT_ERR] = st->tx_aborted_errors; 314 link->l_stats[RTNL_LINK_TX_CARRIER_ERR] = st->tx_carrier_errors; 315 link->l_stats[RTNL_LINK_TX_HBEAT_ERR] = st->tx_heartbeat_errors; 316 link->l_stats[RTNL_LINK_TX_WIN_ERR] = st->tx_window_errors; 317 link->l_stats[RTNL_LINK_MULTICAST] = st->multicast; 318 319 link->ce_mask |= LINK_ATTR_STATS; 320 } 321 322 if (tb[IFLA_TXQLEN]) { 323 link->l_txqlen = nla_get_u32(tb[IFLA_TXQLEN]); 324 link->ce_mask |= LINK_ATTR_TXQLEN; 325 } 326 327 if (tb[IFLA_MTU]) { 328 link->l_mtu = nla_get_u32(tb[IFLA_MTU]); 329 link->ce_mask |= LINK_ATTR_MTU; 330 } 331 332 if (tb[IFLA_ADDRESS]) { 333 link->l_addr = nl_addr_alloc_attr(tb[IFLA_ADDRESS], AF_UNSPEC); 334 if (link->l_addr == NULL) { 335 err = -NLE_NOMEM; 336 goto errout; 337 } 338 nl_addr_set_family(link->l_addr, 339 nl_addr_guess_family(link->l_addr)); 340 link->ce_mask |= LINK_ATTR_ADDR; 341 } 342 343 if (tb[IFLA_BROADCAST]) { 344 link->l_bcast = nl_addr_alloc_attr(tb[IFLA_BROADCAST], 345 AF_UNSPEC); 346 if (link->l_bcast == NULL) { 347 err = -NLE_NOMEM; 348 goto errout; 349 } 350 nl_addr_set_family(link->l_bcast, 351 nl_addr_guess_family(link->l_bcast)); 352 link->ce_mask |= LINK_ATTR_BRD; 353 } 354 355 if (tb[IFLA_LINK]) { 356 link->l_link = nla_get_u32(tb[IFLA_LINK]); 357 link->ce_mask |= LINK_ATTR_LINK; 358 } 359 360 if (tb[IFLA_WEIGHT]) { 361 link->l_weight = nla_get_u32(tb[IFLA_WEIGHT]); 362 link->ce_mask |= LINK_ATTR_WEIGHT; 363 } 364 365 if (tb[IFLA_QDISC]) { 366 nla_strlcpy(link->l_qdisc, tb[IFLA_QDISC], IFQDISCSIZ); 367 link->ce_mask |= LINK_ATTR_QDISC; 368 } 369 370 if (tb[IFLA_MAP]) { 371 nla_memcpy(&link->l_map, tb[IFLA_MAP], 372 sizeof(struct rtnl_link_ifmap)); 373 link->ce_mask |= LINK_ATTR_MAP; 374 } 375 376 if (tb[IFLA_MASTER]) { 377 link->l_master = nla_get_u32(tb[IFLA_MASTER]); 378 link->ce_mask |= LINK_ATTR_MASTER; 379 } 380 381 if (tb[IFLA_OPERSTATE]) { 382 link->l_operstate = nla_get_u8(tb[IFLA_OPERSTATE]); 383 link->ce_mask |= LINK_ATTR_OPERSTATE; 384 } 385 386 if (tb[IFLA_LINKMODE]) { 387 link->l_linkmode = nla_get_u8(tb[IFLA_LINKMODE]); 388 link->ce_mask |= LINK_ATTR_LINKMODE; 389 } 390 391 if (tb[IFLA_LINKINFO]) { 392 struct nlattr *li[IFLA_INFO_MAX+1]; 393 394 err = nla_parse_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO], 395 link_info_policy); 396 if (err < 0) 397 goto errout; 398 399 if (li[IFLA_INFO_KIND] && 400 (li[IFLA_INFO_DATA] || li[IFLA_INFO_XSTATS])) { 401 struct rtnl_link_info_ops *ops; 402 char *kind; 403 404 kind = nla_get_string(li[IFLA_INFO_KIND]); 405 ops = rtnl_link_info_ops_lookup(kind); 406 if (ops != NULL) { 407 ops->io_refcnt++; 408 link->l_info_ops = ops; 409 err = ops->io_parse(link, li[IFLA_INFO_DATA], 410 li[IFLA_INFO_XSTATS]); 411 if (err < 0) 412 goto errout; 413 } else { 414 /* XXX: Warn about unparsed info? */ 415 } 416 } 417 } 418 419 err = pp->pp_cb((struct nl_object *) link, pp); 420 errout: 421 rtnl_link_put(link); 422 return err; 423 } 424 425 static int link_request_update(struct nl_cache *cache, struct nl_sock *sk) 426 { 427 return nl_rtgen_request(sk, RTM_GETLINK, AF_UNSPEC, NLM_F_DUMP); 428 } 429 430 static void link_dump_line(struct nl_object *obj, struct nl_dump_params *p) 431 { 432 char buf[128]; 433 struct nl_cache *cache = dp_cache(obj); 434 struct rtnl_link *link = (struct rtnl_link *) obj; 435 436 nl_dump_line(p, "%s %s ", link->l_name, 437 nl_llproto2str(link->l_arptype, buf, sizeof(buf))); 438 439 if (link->l_addr && !nl_addr_iszero(link->l_addr)) 440 nl_dump(p, "%s ", nl_addr2str(link->l_addr, buf, sizeof(buf))); 441 442 if (link->ce_mask & LINK_ATTR_MASTER) { 443 struct rtnl_link *master = rtnl_link_get(cache, link->l_master); 444 nl_dump(p, "master %s ", master ? master->l_name : "inv"); 445 if (master) 446 rtnl_link_put(master); 447 } 448 449 rtnl_link_flags2str(link->l_flags, buf, sizeof(buf)); 450 if (buf[0]) 451 nl_dump(p, "<%s> ", buf); 452 453 if (link->ce_mask & LINK_ATTR_LINK) { 454 struct rtnl_link *ll = rtnl_link_get(cache, link->l_link); 455 nl_dump(p, "slave-of %s ", ll ? ll->l_name : "NONE"); 456 if (ll) 457 rtnl_link_put(ll); 458 } 459 460 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_LINE]) 461 link->l_info_ops->io_dump[NL_DUMP_LINE](link, p); 462 463 nl_dump(p, "\n"); 464 } 465 466 static void link_dump_details(struct nl_object *obj, struct nl_dump_params *p) 467 { 468 struct rtnl_link *link = (struct rtnl_link *) obj; 469 char buf[64]; 470 471 link_dump_line(obj, p); 472 473 nl_dump_line(p, " mtu %u ", link->l_mtu); 474 nl_dump(p, "txqlen %u weight %u ", link->l_txqlen, link->l_weight); 475 476 if (link->ce_mask & LINK_ATTR_QDISC) 477 nl_dump(p, "qdisc %s ", link->l_qdisc); 478 479 if (link->ce_mask & LINK_ATTR_MAP && link->l_map.lm_irq) 480 nl_dump(p, "irq %u ", link->l_map.lm_irq); 481 482 if (link->ce_mask & LINK_ATTR_IFINDEX) 483 nl_dump(p, "index %u ", link->l_index); 484 485 486 nl_dump(p, "\n"); 487 nl_dump_line(p, " "); 488 489 if (link->ce_mask & LINK_ATTR_BRD) 490 nl_dump(p, "brd %s ", nl_addr2str(link->l_bcast, buf, 491 sizeof(buf))); 492 493 if ((link->ce_mask & LINK_ATTR_OPERSTATE) && 494 link->l_operstate != IF_OPER_UNKNOWN) { 495 rtnl_link_operstate2str(link->l_operstate, buf, sizeof(buf)); 496 nl_dump(p, "state %s ", buf); 497 } 498 499 nl_dump(p, "mode %s\n", 500 rtnl_link_mode2str(link->l_linkmode, buf, sizeof(buf))); 501 502 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_DETAILS]) 503 link->l_info_ops->io_dump[NL_DUMP_DETAILS](link, p); 504 } 505 506 static void link_dump_stats(struct nl_object *obj, struct nl_dump_params *p) 507 { 508 struct rtnl_link *link = (struct rtnl_link *) obj; 509 char *unit, fmt[64]; 510 float res; 511 512 link_dump_details(obj, p); 513 514 nl_dump_line(p, " Stats: bytes packets errors " 515 " dropped fifo-err compressed\n"); 516 517 res = nl_cancel_down_bytes(link->l_stats[RTNL_LINK_RX_BYTES], &unit); 518 519 strcpy(fmt, " RX %X.2f %s %10llu %10llu %10llu %10llu %10llu\n"); 520 fmt[9] = *unit == 'B' ? '9' : '7'; 521 522 nl_dump_line(p, fmt, res, unit, 523 link->l_stats[RTNL_LINK_RX_PACKETS], 524 link->l_stats[RTNL_LINK_RX_ERRORS], 525 link->l_stats[RTNL_LINK_RX_DROPPED], 526 link->l_stats[RTNL_LINK_RX_FIFO_ERR], 527 link->l_stats[RTNL_LINK_RX_COMPRESSED]); 528 529 res = nl_cancel_down_bytes(link->l_stats[RTNL_LINK_TX_BYTES], &unit); 530 531 strcpy(fmt, " TX %X.2f %s %10llu %10llu %10llu %10llu %10llu\n"); 532 fmt[9] = *unit == 'B' ? '9' : '7'; 533 534 nl_dump_line(p, fmt, res, unit, 535 link->l_stats[RTNL_LINK_TX_PACKETS], 536 link->l_stats[RTNL_LINK_TX_ERRORS], 537 link->l_stats[RTNL_LINK_TX_DROPPED], 538 link->l_stats[RTNL_LINK_TX_FIFO_ERR], 539 link->l_stats[RTNL_LINK_TX_COMPRESSED]); 540 541 nl_dump_line(p, " Errors: length over crc " 542 " frame missed multicast\n"); 543 544 nl_dump_line(p, " RX %10" PRIu64 " %10" PRIu64 " %10" 545 PRIu64 " %10" PRIu64 " %10" PRIu64 " %10" 546 PRIu64 "\n", 547 link->l_stats[RTNL_LINK_RX_LEN_ERR], 548 link->l_stats[RTNL_LINK_RX_OVER_ERR], 549 link->l_stats[RTNL_LINK_RX_CRC_ERR], 550 link->l_stats[RTNL_LINK_RX_FRAME_ERR], 551 link->l_stats[RTNL_LINK_RX_MISSED_ERR], 552 link->l_stats[RTNL_LINK_MULTICAST]); 553 554 nl_dump_line(p, " aborted carrier heartbeat " 555 " window collision\n"); 556 557 nl_dump_line(p, " TX %10" PRIu64 " %10" PRIu64 " %10" 558 PRIu64 " %10" PRIu64 " %10" PRIu64 "\n", 559 link->l_stats[RTNL_LINK_TX_ABORT_ERR], 560 link->l_stats[RTNL_LINK_TX_CARRIER_ERR], 561 link->l_stats[RTNL_LINK_TX_HBEAT_ERR], 562 link->l_stats[RTNL_LINK_TX_WIN_ERR], 563 link->l_stats[RTNL_LINK_TX_COLLISIONS]); 564 565 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_STATS]) 566 link->l_info_ops->io_dump[NL_DUMP_STATS](link, p); 567 } 568 569 static void link_dump_env(struct nl_object *obj, struct nl_dump_params *p) 570 { 571 struct rtnl_link *link = (struct rtnl_link *) obj; 572 struct nl_cache *cache = dp_cache(obj); 573 char buf[128]; 574 int i; 575 576 nl_dump_line(p, "LINK_NAME=%s\n", link->l_name); 577 nl_dump_line(p, "LINK_IFINDEX=%u\n", link->l_index); 578 nl_dump_line(p, "LINK_FAMILY=%s\n", 579 nl_af2str(link->l_family, buf, sizeof(buf))); 580 nl_dump_line(p, "LINK_TYPE=%s\n", 581 nl_llproto2str(link->l_arptype, buf, sizeof(buf))); 582 if (link->ce_mask & LINK_ATTR_ADDR) 583 nl_dump_line(p, "LINK_ADDRESS=%s\n", 584 nl_addr2str(link->l_addr, buf, sizeof(buf))); 585 nl_dump_line(p, "LINK_MTU=%u\n", link->l_mtu); 586 nl_dump_line(p, "LINK_TXQUEUELEN=%u\n", link->l_txqlen); 587 nl_dump_line(p, "LINK_WEIGHT=%u\n", link->l_weight); 588 589 rtnl_link_flags2str(link->l_flags & ~IFF_RUNNING, buf, sizeof(buf)); 590 if (buf[0]) 591 nl_dump_line(p, "LINK_FLAGS=%s\n", buf); 592 593 if (link->ce_mask & LINK_ATTR_QDISC) 594 nl_dump_line(p, "LINK_QDISC=%s\n", link->l_qdisc); 595 596 if (link->ce_mask & LINK_ATTR_LINK) { 597 struct rtnl_link *ll = rtnl_link_get(cache, link->l_link); 598 599 nl_dump_line(p, "LINK_LINK_IFINDEX=%d\n", link->l_link); 600 if (ll) { 601 nl_dump_line(p, "LINK_LINK_IFNAME=%s\n", ll->l_name); 602 rtnl_link_put(ll); 603 } 604 } 605 606 if (link->ce_mask & LINK_ATTR_MASTER) { 607 struct rtnl_link *master = rtnl_link_get(cache, link->l_master); 608 nl_dump_line(p, "LINK_MASTER=%s\n", 609 master ? master->l_name : "none"); 610 if (master) 611 rtnl_link_put(master); 612 } 613 614 if (link->ce_mask & LINK_ATTR_BRD) 615 nl_dump_line(p, "LINK_BROADCAST=%s\n", 616 nl_addr2str(link->l_bcast, buf, sizeof(buf))); 617 618 if (link->ce_mask & LINK_ATTR_STATS) { 619 for (i = 0; i <= RTNL_LINK_STATS_MAX; i++) { 620 char *c = buf; 621 622 sprintf(buf, "LINK_"); 623 rtnl_link_stat2str(i, buf + 5, sizeof(buf) - 5); 624 while (*c) { 625 *c = toupper(*c); 626 c++; 627 } 628 nl_dump_line(p, "%s=%" PRIu64 "\n", buf, link->l_stats[i]); 629 } 630 } 631 632 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_ENV]) 633 link->l_info_ops->io_dump[NL_DUMP_ENV](link, p); 634 } 635 636 #if 0 637 static int link_handle_event(struct nl_object *a, struct rtnl_link_event_cb *cb) 638 { 639 struct rtnl_link *l = (struct rtnl_link *) a; 640 struct nl_cache *c = dp_cache(a); 641 int nevents = 0; 642 643 if (l->l_change == ~0U) { 644 if (l->ce_msgtype == RTM_NEWLINK) 645 cb->le_register(l); 646 else 647 cb->le_unregister(l); 648 649 return 1; 650 } 651 652 if (l->l_change & IFF_SLAVE) { 653 if (l->l_flags & IFF_SLAVE) { 654 struct rtnl_link *m = rtnl_link_get(c, l->l_master); 655 cb->le_new_bonding(l, m); 656 if (m) 657 rtnl_link_put(m); 658 } else 659 cb->le_cancel_bonding(l); 660 } 661 662 #if 0 663 if (l->l_change & IFF_UP && l->l_change & IFF_RUNNING) 664 dp_dump_line(p, line++, "link %s changed state to %s.\n", 665 l->l_name, l->l_flags & IFF_UP ? "up" : "down"); 666 667 if (l->l_change & IFF_PROMISC) { 668 dp_new_line(p, line++); 669 dp_dump(p, "link %s %s promiscuous mode.\n", 670 l->l_name, l->l_flags & IFF_PROMISC ? "entered" : "left"); 671 } 672 673 if (line == 0) 674 dp_dump_line(p, line++, "link %s sent unknown event.\n", 675 l->l_name); 676 #endif 677 678 return nevents; 679 } 680 #endif 681 682 static int link_compare(struct nl_object *_a, struct nl_object *_b, 683 uint32_t attrs, int flags) 684 { 685 struct rtnl_link *a = (struct rtnl_link *) _a; 686 struct rtnl_link *b = (struct rtnl_link *) _b; 687 int diff = 0; 688 689 #define LINK_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, LINK_ATTR_##ATTR, a, b, EXPR) 690 691 diff |= LINK_DIFF(IFINDEX, a->l_index != b->l_index); 692 diff |= LINK_DIFF(MTU, a->l_mtu != b->l_mtu); 693 diff |= LINK_DIFF(LINK, a->l_link != b->l_link); 694 diff |= LINK_DIFF(TXQLEN, a->l_txqlen != b->l_txqlen); 695 diff |= LINK_DIFF(WEIGHT, a->l_weight != b->l_weight); 696 diff |= LINK_DIFF(MASTER, a->l_master != b->l_master); 697 diff |= LINK_DIFF(FAMILY, a->l_family != b->l_family); 698 diff |= LINK_DIFF(OPERSTATE, a->l_operstate != b->l_operstate); 699 diff |= LINK_DIFF(LINKMODE, a->l_linkmode != b->l_linkmode); 700 diff |= LINK_DIFF(QDISC, strcmp(a->l_qdisc, b->l_qdisc)); 701 diff |= LINK_DIFF(IFNAME, strcmp(a->l_name, b->l_name)); 702 diff |= LINK_DIFF(ADDR, nl_addr_cmp(a->l_addr, b->l_addr)); 703 diff |= LINK_DIFF(BRD, nl_addr_cmp(a->l_bcast, b->l_bcast)); 704 705 if (flags & LOOSE_COMPARISON) 706 diff |= LINK_DIFF(FLAGS, 707 (a->l_flags ^ b->l_flags) & b->l_flag_mask); 708 else 709 diff |= LINK_DIFF(FLAGS, a->l_flags != b->l_flags); 710 711 #undef LINK_DIFF 712 713 return diff; 714 } 715 716 static struct trans_tbl link_attrs[] = { 717 __ADD(LINK_ATTR_MTU, mtu) 718 __ADD(LINK_ATTR_LINK, link) 719 __ADD(LINK_ATTR_TXQLEN, txqlen) 720 __ADD(LINK_ATTR_WEIGHT, weight) 721 __ADD(LINK_ATTR_MASTER, master) 722 __ADD(LINK_ATTR_QDISC, qdisc) 723 __ADD(LINK_ATTR_MAP, map) 724 __ADD(LINK_ATTR_ADDR, address) 725 __ADD(LINK_ATTR_BRD, broadcast) 726 __ADD(LINK_ATTR_FLAGS, flags) 727 __ADD(LINK_ATTR_IFNAME, name) 728 __ADD(LINK_ATTR_IFINDEX, ifindex) 729 __ADD(LINK_ATTR_FAMILY, family) 730 __ADD(LINK_ATTR_ARPTYPE, arptype) 731 __ADD(LINK_ATTR_STATS, stats) 732 __ADD(LINK_ATTR_CHANGE, change) 733 __ADD(LINK_ATTR_OPERSTATE, operstate) 734 __ADD(LINK_ATTR_LINKMODE, linkmode) 735 }; 736 737 static char *link_attrs2str(int attrs, char *buf, size_t len) 738 { 739 return __flags2str(attrs, buf, len, link_attrs, 740 ARRAY_SIZE(link_attrs)); 741 } 742 743 /** 744 * @name Allocation/Freeing 745 * @{ 746 */ 747 748 struct rtnl_link *rtnl_link_alloc(void) 749 { 750 return (struct rtnl_link *) nl_object_alloc(&link_obj_ops); 751 } 752 753 void rtnl_link_put(struct rtnl_link *link) 754 { 755 nl_object_put((struct nl_object *) link); 756 } 757 758 /** @} */ 759 760 /** 761 * @name Cache Management 762 * @{ 763 */ 764 765 766 /** 767 * Allocate link cache and fill in all configured links. 768 * @arg sk Netlink socket. 769 * @arg result Pointer to store resulting cache. 770 * 771 * Allocates a new link cache, initializes it properly and updates it 772 * to include all links currently configured in the kernel. 773 * 774 * @return 0 on success or a negative error code. 775 */ 776 int rtnl_link_alloc_cache(struct nl_sock *sk, struct nl_cache **result) 777 { 778 return nl_cache_alloc_and_fill(&rtnl_link_ops, sk, result); 779 } 780 781 /** 782 * Look up link by interface index in the provided cache 783 * @arg cache link cache 784 * @arg ifindex link interface index 785 * 786 * The caller owns a reference on the returned object and 787 * must give the object back via rtnl_link_put(). 788 * 789 * @return pointer to link inside the cache or NULL if no match was found. 790 */ 791 struct rtnl_link *rtnl_link_get(struct nl_cache *cache, int ifindex) 792 { 793 struct rtnl_link *link; 794 795 if (cache->c_ops != &rtnl_link_ops) 796 return NULL; 797 798 nl_list_for_each_entry(link, &cache->c_items, ce_list) { 799 if (link->l_index == ifindex) { 800 nl_object_get((struct nl_object *) link); 801 return link; 802 } 803 } 804 805 return NULL; 806 } 807 808 /** 809 * Look up link by link name in the provided cache 810 * @arg cache link cache 811 * @arg name link name 812 * 813 * The caller owns a reference on the returned object and 814 * must give the object back via rtnl_link_put(). 815 * 816 * @return pointer to link inside the cache or NULL if no match was found. 817 */ 818 struct rtnl_link *rtnl_link_get_by_name(struct nl_cache *cache, 819 const char *name) 820 { 821 struct rtnl_link *link; 822 823 if (cache->c_ops != &rtnl_link_ops) 824 return NULL; 825 826 nl_list_for_each_entry(link, &cache->c_items, ce_list) { 827 if (!strcmp(name, link->l_name)) { 828 nl_object_get((struct nl_object *) link); 829 return link; 830 } 831 } 832 833 return NULL; 834 } 835 836 /** @} */ 837 838 /** 839 * @name Link Modifications 840 * @{ 841 */ 842 843 /** 844 * Builds a netlink change request message to change link attributes 845 * @arg old link to be changed 846 * @arg tmpl template with requested changes 847 * @arg flags additional netlink message flags 848 * 849 * Builds a new netlink message requesting a change of link attributes. 850 * The netlink message header isn't fully equipped with all relevant 851 * fields and must be sent out via nl_send_auto_complete() or 852 * supplemented as needed. 853 * \a old must point to a link currently configured in the kernel 854 * and \a tmpl must contain the attributes to be changed set via 855 * \c rtnl_link_set_* functions. 856 * 857 * @return New netlink message 858 * @note Not all attributes can be changed, see 859 * \ref link_changeable "Changeable Attributes" for more details. 860 */ 861 int rtnl_link_build_change_request(struct rtnl_link *old, 862 struct rtnl_link *tmpl, int flags, 863 struct nl_msg **result) 864 { 865 struct nl_msg *msg; 866 struct ifinfomsg ifi = { 867 .ifi_family = old->l_family, 868 .ifi_index = old->l_index, 869 }; 870 871 if (tmpl->ce_mask & LINK_ATTR_FLAGS) { 872 ifi.ifi_flags = old->l_flags & ~tmpl->l_flag_mask; 873 ifi.ifi_flags |= tmpl->l_flags; 874 } 875 876 msg = nlmsg_alloc_simple(RTM_SETLINK, flags); 877 if (!msg) 878 return -NLE_NOMEM; 879 880 if (nlmsg_append(msg, &ifi, sizeof(ifi), NLMSG_ALIGNTO) < 0) 881 goto nla_put_failure; 882 883 if (tmpl->ce_mask & LINK_ATTR_ADDR) 884 NLA_PUT_ADDR(msg, IFLA_ADDRESS, tmpl->l_addr); 885 886 if (tmpl->ce_mask & LINK_ATTR_BRD) 887 NLA_PUT_ADDR(msg, IFLA_BROADCAST, tmpl->l_bcast); 888 889 if (tmpl->ce_mask & LINK_ATTR_MTU) 890 NLA_PUT_U32(msg, IFLA_MTU, tmpl->l_mtu); 891 892 if (tmpl->ce_mask & LINK_ATTR_TXQLEN) 893 NLA_PUT_U32(msg, IFLA_TXQLEN, tmpl->l_txqlen); 894 895 if (tmpl->ce_mask & LINK_ATTR_WEIGHT) 896 NLA_PUT_U32(msg, IFLA_WEIGHT, tmpl->l_weight); 897 898 if (tmpl->ce_mask & LINK_ATTR_IFNAME) 899 NLA_PUT_STRING(msg, IFLA_IFNAME, tmpl->l_name); 900 901 if (tmpl->ce_mask & LINK_ATTR_OPERSTATE) 902 NLA_PUT_U8(msg, IFLA_OPERSTATE, tmpl->l_operstate); 903 904 if (tmpl->ce_mask & LINK_ATTR_LINKMODE) 905 NLA_PUT_U8(msg, IFLA_LINKMODE, tmpl->l_linkmode); 906 907 if ((tmpl->ce_mask & LINK_ATTR_LINKINFO) && tmpl->l_info_ops && 908 tmpl->l_info_ops->io_put_attrs) { 909 struct nlattr *info; 910 911 if (!(info = nla_nest_start(msg, IFLA_LINKINFO))) 912 goto nla_put_failure; 913 914 NLA_PUT_STRING(msg, IFLA_INFO_KIND, tmpl->l_info_ops->io_name); 915 916 if (tmpl->l_info_ops->io_put_attrs(msg, tmpl) < 0) 917 goto nla_put_failure; 918 919 nla_nest_end(msg, info); 920 } 921 922 *result = msg; 923 return 0; 924 925 nla_put_failure: 926 nlmsg_free(msg); 927 return -NLE_MSGSIZE; 928 } 929 930 /** 931 * Change link attributes 932 * @arg sk Netlink socket. 933 * @arg old link to be changed 934 * @arg tmpl template with requested changes 935 * @arg flags additional netlink message flags 936 * 937 * Builds a new netlink message by calling rtnl_link_build_change_request(), 938 * sends the request to the kernel and waits for the next ACK to be 939 * received, i.e. blocks until the request has been processed. 940 * 941 * @return 0 on success or a negative error code 942 * @note Not all attributes can be changed, see 943 * \ref link_changeable "Changeable Attributes" for more details. 944 */ 945 int rtnl_link_change(struct nl_sock *sk, struct rtnl_link *old, 946 struct rtnl_link *tmpl, int flags) 947 { 948 struct nl_msg *msg; 949 int err; 950 951 if ((err = rtnl_link_build_change_request(old, tmpl, flags, &msg)) < 0) 952 return err; 953 954 err = nl_send_auto_complete(sk, msg); 955 nlmsg_free(msg); 956 if (err < 0) 957 return err; 958 959 return wait_for_ack(sk); 960 } 961 962 /** @} */ 963 964 /** 965 * @name Name <-> Index Translations 966 * @{ 967 */ 968 969 /** 970 * Translate an interface index to the corresponding link name 971 * @arg cache link cache 972 * @arg ifindex link interface index 973 * @arg dst destination buffer 974 * @arg len length of destination buffer 975 * 976 * Translates the specified interface index to the corresponding 977 * link name and stores the name in the destination buffer. 978 * 979 * @return link name or NULL if no match was found. 980 */ 981 char * rtnl_link_i2name(struct nl_cache *cache, int ifindex, char *dst, 982 size_t len) 983 { 984 struct rtnl_link *link = rtnl_link_get(cache, ifindex); 985 986 if (link) { 987 strncpy(dst, link->l_name, len - 1); 988 rtnl_link_put(link); 989 return dst; 990 } 991 992 return NULL; 993 } 994 995 /** 996 * Translate a link name to the corresponding interface index 997 * @arg cache link cache 998 * @arg name link name 999 * 1000 * @return interface index or 0 if no match was found. 1001 */ 1002 int rtnl_link_name2i(struct nl_cache *cache, const char *name) 1003 { 1004 int ifindex = 0; 1005 struct rtnl_link *link; 1006 1007 link = rtnl_link_get_by_name(cache, name); 1008 if (link) { 1009 ifindex = link->l_index; 1010 rtnl_link_put(link); 1011 } 1012 1013 return ifindex; 1014 } 1015 1016 /** @} */ 1017 1018 /** 1019 * @name Link Flags Translations 1020 * @{ 1021 */ 1022 1023 static struct trans_tbl link_flags[] = { 1024 __ADD(IFF_LOOPBACK, loopback) 1025 __ADD(IFF_BROADCAST, broadcast) 1026 __ADD(IFF_POINTOPOINT, pointopoint) 1027 __ADD(IFF_MULTICAST, multicast) 1028 __ADD(IFF_NOARP, noarp) 1029 __ADD(IFF_ALLMULTI, allmulti) 1030 __ADD(IFF_PROMISC, promisc) 1031 __ADD(IFF_MASTER, master) 1032 __ADD(IFF_SLAVE, slave) 1033 __ADD(IFF_DEBUG, debug) 1034 __ADD(IFF_DYNAMIC, dynamic) 1035 __ADD(IFF_AUTOMEDIA, automedia) 1036 __ADD(IFF_PORTSEL, portsel) 1037 __ADD(IFF_NOTRAILERS, notrailers) 1038 __ADD(IFF_UP, up) 1039 __ADD(IFF_RUNNING, running) 1040 __ADD(IFF_LOWER_UP, lowerup) 1041 __ADD(IFF_DORMANT, dormant) 1042 __ADD(IFF_ECHO, echo) 1043 }; 1044 1045 char * rtnl_link_flags2str(int flags, char *buf, size_t len) 1046 { 1047 return __flags2str(flags, buf, len, link_flags, 1048 ARRAY_SIZE(link_flags)); 1049 } 1050 1051 int rtnl_link_str2flags(const char *name) 1052 { 1053 return __str2flags(name, link_flags, ARRAY_SIZE(link_flags)); 1054 } 1055 1056 /** @} */ 1057 1058 /** 1059 * @name Link Statistics Translations 1060 * @{ 1061 */ 1062 1063 static struct trans_tbl link_stats[] = { 1064 __ADD(RTNL_LINK_RX_PACKETS, rx_packets) 1065 __ADD(RTNL_LINK_TX_PACKETS, tx_packets) 1066 __ADD(RTNL_LINK_RX_BYTES, rx_bytes) 1067 __ADD(RTNL_LINK_TX_BYTES, tx_bytes) 1068 __ADD(RTNL_LINK_RX_ERRORS, rx_errors) 1069 __ADD(RTNL_LINK_TX_ERRORS, tx_errors) 1070 __ADD(RTNL_LINK_RX_DROPPED, rx_dropped) 1071 __ADD(RTNL_LINK_TX_DROPPED, tx_dropped) 1072 __ADD(RTNL_LINK_RX_COMPRESSED, rx_compressed) 1073 __ADD(RTNL_LINK_TX_COMPRESSED, tx_compressed) 1074 __ADD(RTNL_LINK_RX_FIFO_ERR, rx_fifo_err) 1075 __ADD(RTNL_LINK_TX_FIFO_ERR, tx_fifo_err) 1076 __ADD(RTNL_LINK_RX_LEN_ERR, rx_len_err) 1077 __ADD(RTNL_LINK_RX_OVER_ERR, rx_over_err) 1078 __ADD(RTNL_LINK_RX_CRC_ERR, rx_crc_err) 1079 __ADD(RTNL_LINK_RX_FRAME_ERR, rx_frame_err) 1080 __ADD(RTNL_LINK_RX_MISSED_ERR, rx_missed_err) 1081 __ADD(RTNL_LINK_TX_ABORT_ERR, tx_abort_err) 1082 __ADD(RTNL_LINK_TX_CARRIER_ERR, tx_carrier_err) 1083 __ADD(RTNL_LINK_TX_HBEAT_ERR, tx_hbeat_err) 1084 __ADD(RTNL_LINK_TX_WIN_ERR, tx_win_err) 1085 __ADD(RTNL_LINK_TX_COLLISIONS, tx_collision) 1086 __ADD(RTNL_LINK_MULTICAST, multicast) 1087 }; 1088 1089 char *rtnl_link_stat2str(int st, char *buf, size_t len) 1090 { 1091 return __type2str(st, buf, len, link_stats, ARRAY_SIZE(link_stats)); 1092 } 1093 1094 int rtnl_link_str2stat(const char *name) 1095 { 1096 return __str2type(name, link_stats, ARRAY_SIZE(link_stats)); 1097 } 1098 1099 /** @} */ 1100 1101 /** 1102 * @name Link Operstate Translations 1103 * @{ 1104 */ 1105 1106 static struct trans_tbl link_operstates[] = { 1107 __ADD(IF_OPER_UNKNOWN, unknown) 1108 __ADD(IF_OPER_NOTPRESENT, notpresent) 1109 __ADD(IF_OPER_DOWN, down) 1110 __ADD(IF_OPER_LOWERLAYERDOWN, lowerlayerdown) 1111 __ADD(IF_OPER_TESTING, testing) 1112 __ADD(IF_OPER_DORMANT, dormant) 1113 __ADD(IF_OPER_UP, up) 1114 }; 1115 1116 char *rtnl_link_operstate2str(int st, char *buf, size_t len) 1117 { 1118 return __type2str(st, buf, len, link_operstates, 1119 ARRAY_SIZE(link_operstates)); 1120 } 1121 1122 int rtnl_link_str2operstate(const char *name) 1123 { 1124 return __str2type(name, link_operstates, 1125 ARRAY_SIZE(link_operstates)); 1126 } 1127 1128 /** @} */ 1129 1130 /** 1131 * @name Link Mode Translations 1132 * @{ 1133 */ 1134 1135 static struct trans_tbl link_modes[] = { 1136 __ADD(IF_LINK_MODE_DEFAULT, default) 1137 __ADD(IF_LINK_MODE_DORMANT, dormant) 1138 }; 1139 1140 char *rtnl_link_mode2str(int st, char *buf, size_t len) 1141 { 1142 return __type2str(st, buf, len, link_modes, ARRAY_SIZE(link_modes)); 1143 } 1144 1145 int rtnl_link_str2mode(const char *name) 1146 { 1147 return __str2type(name, link_modes, ARRAY_SIZE(link_modes)); 1148 } 1149 1150 /** @} */ 1151 1152 /** 1153 * @name Attributes 1154 * @{ 1155 */ 1156 1157 void rtnl_link_set_qdisc(struct rtnl_link *link, const char *qdisc) 1158 { 1159 strncpy(link->l_qdisc, qdisc, sizeof(link->l_qdisc) - 1); 1160 link->ce_mask |= LINK_ATTR_QDISC; 1161 } 1162 1163 char *rtnl_link_get_qdisc(struct rtnl_link *link) 1164 { 1165 if (link->ce_mask & LINK_ATTR_QDISC) 1166 return link->l_qdisc; 1167 else 1168 return NULL; 1169 } 1170 1171 void rtnl_link_set_name(struct rtnl_link *link, const char *name) 1172 { 1173 strncpy(link->l_name, name, sizeof(link->l_name) - 1); 1174 link->ce_mask |= LINK_ATTR_IFNAME; 1175 } 1176 1177 char *rtnl_link_get_name(struct rtnl_link *link) 1178 { 1179 if (link->ce_mask & LINK_ATTR_IFNAME) 1180 return link->l_name; 1181 else 1182 return NULL; 1183 } 1184 1185 static inline void __assign_addr(struct rtnl_link *link, struct nl_addr **pos, 1186 struct nl_addr *new, int flag) 1187 { 1188 if (*pos) 1189 nl_addr_put(*pos); 1190 1191 nl_addr_get(new); 1192 *pos = new; 1193 1194 link->ce_mask |= flag; 1195 } 1196 1197 void rtnl_link_set_addr(struct rtnl_link *link, struct nl_addr *addr) 1198 { 1199 __assign_addr(link, &link->l_addr, addr, LINK_ATTR_ADDR); 1200 } 1201 1202 struct nl_addr *rtnl_link_get_addr(struct rtnl_link *link) 1203 { 1204 if (link->ce_mask & LINK_ATTR_ADDR) 1205 return link->l_addr; 1206 else 1207 return NULL; 1208 } 1209 1210 void rtnl_link_set_broadcast(struct rtnl_link *link, struct nl_addr *brd) 1211 { 1212 __assign_addr(link, &link->l_bcast, brd, LINK_ATTR_BRD); 1213 } 1214 1215 struct nl_addr *rtnl_link_get_broadcast(struct rtnl_link *link) 1216 { 1217 if (link->ce_mask & LINK_ATTR_BRD) 1218 return link->l_bcast; 1219 else 1220 return NULL; 1221 } 1222 1223 void rtnl_link_set_flags(struct rtnl_link *link, unsigned int flags) 1224 { 1225 link->l_flag_mask |= flags; 1226 link->l_flags |= flags; 1227 link->ce_mask |= LINK_ATTR_FLAGS; 1228 } 1229 1230 void rtnl_link_unset_flags(struct rtnl_link *link, unsigned int flags) 1231 { 1232 link->l_flag_mask |= flags; 1233 link->l_flags &= ~flags; 1234 link->ce_mask |= LINK_ATTR_FLAGS; 1235 } 1236 1237 unsigned int rtnl_link_get_flags(struct rtnl_link *link) 1238 { 1239 return link->l_flags; 1240 } 1241 1242 void rtnl_link_set_family(struct rtnl_link *link, int family) 1243 { 1244 link->l_family = family; 1245 link->ce_mask |= LINK_ATTR_FAMILY; 1246 } 1247 1248 int rtnl_link_get_family(struct rtnl_link *link) 1249 { 1250 if (link->l_family & LINK_ATTR_FAMILY) 1251 return link->l_family; 1252 else 1253 return AF_UNSPEC; 1254 } 1255 1256 void rtnl_link_set_arptype(struct rtnl_link *link, unsigned int arptype) 1257 { 1258 link->l_arptype = arptype; 1259 } 1260 1261 unsigned int rtnl_link_get_arptype(struct rtnl_link *link) 1262 { 1263 return link->l_arptype; 1264 } 1265 1266 void rtnl_link_set_ifindex(struct rtnl_link *link, int ifindex) 1267 { 1268 link->l_index = ifindex; 1269 link->ce_mask |= LINK_ATTR_IFINDEX; 1270 } 1271 1272 int rtnl_link_get_ifindex(struct rtnl_link *link) 1273 { 1274 return link->l_index; 1275 } 1276 1277 void rtnl_link_set_mtu(struct rtnl_link *link, unsigned int mtu) 1278 { 1279 link->l_mtu = mtu; 1280 link->ce_mask |= LINK_ATTR_MTU; 1281 } 1282 1283 unsigned int rtnl_link_get_mtu(struct rtnl_link *link) 1284 { 1285 if (link->ce_mask & LINK_ATTR_MTU) 1286 return link->l_mtu; 1287 else 1288 return 0; 1289 } 1290 1291 void rtnl_link_set_txqlen(struct rtnl_link *link, unsigned int txqlen) 1292 { 1293 link->l_txqlen = txqlen; 1294 link->ce_mask |= LINK_ATTR_TXQLEN; 1295 } 1296 1297 unsigned int rtnl_link_get_txqlen(struct rtnl_link *link) 1298 { 1299 if (link->ce_mask & LINK_ATTR_TXQLEN) 1300 return link->l_txqlen; 1301 else 1302 return UINT_MAX; 1303 } 1304 1305 void rtnl_link_set_weight(struct rtnl_link *link, unsigned int weight) 1306 { 1307 link->l_weight = weight; 1308 link->ce_mask |= LINK_ATTR_WEIGHT; 1309 } 1310 1311 unsigned int rtnl_link_get_weight(struct rtnl_link *link) 1312 { 1313 if (link->ce_mask & LINK_ATTR_WEIGHT) 1314 return link->l_weight; 1315 else 1316 return UINT_MAX; 1317 } 1318 1319 void rtnl_link_set_link(struct rtnl_link *link, int ifindex) 1320 { 1321 link->l_link = ifindex; 1322 link->ce_mask |= LINK_ATTR_LINK; 1323 } 1324 1325 int rtnl_link_get_link(struct rtnl_link *link) 1326 { 1327 return link->l_link; 1328 } 1329 1330 void rtnl_link_set_master(struct rtnl_link *link, int ifindex) 1331 { 1332 link->l_master = ifindex; 1333 link->ce_mask |= LINK_ATTR_MASTER; 1334 } 1335 1336 int rtnl_link_get_master(struct rtnl_link *link) 1337 { 1338 return link->l_master; 1339 } 1340 1341 void rtnl_link_set_operstate(struct rtnl_link *link, uint8_t operstate) 1342 { 1343 link->l_operstate = operstate; 1344 link->ce_mask |= LINK_ATTR_OPERSTATE; 1345 } 1346 1347 uint8_t rtnl_link_get_operstate(struct rtnl_link *link) 1348 { 1349 if (link->ce_mask & LINK_ATTR_OPERSTATE) 1350 return link->l_operstate; 1351 else 1352 return IF_OPER_UNKNOWN; 1353 } 1354 1355 void rtnl_link_set_linkmode(struct rtnl_link *link, uint8_t linkmode) 1356 { 1357 link->l_linkmode = linkmode; 1358 link->ce_mask |= LINK_ATTR_LINKMODE; 1359 } 1360 1361 uint8_t rtnl_link_get_linkmode(struct rtnl_link *link) 1362 { 1363 if (link->ce_mask & LINK_ATTR_LINKMODE) 1364 return link->l_linkmode; 1365 else 1366 return IF_LINK_MODE_DEFAULT; 1367 } 1368 1369 uint64_t rtnl_link_get_stat(struct rtnl_link *link, int id) 1370 { 1371 if (id < 0 || id > RTNL_LINK_STATS_MAX) 1372 return 0; 1373 1374 return link->l_stats[id]; 1375 } 1376 1377 /** 1378 * Specify the info type of a link 1379 * @arg link link object 1380 * @arg type info type 1381 * 1382 * Looks up the info type and prepares the link to store info type 1383 * specific attributes. If an info type has been assigned already 1384 * it will be released with all changes lost. 1385 * 1386 * @return 0 on success or a negative errror code. 1387 */ 1388 int rtnl_link_set_info_type(struct rtnl_link *link, const char *type) 1389 { 1390 struct rtnl_link_info_ops *io; 1391 int err; 1392 1393 if ((io = rtnl_link_info_ops_lookup(type)) == NULL) 1394 return -NLE_OPNOTSUPP; 1395 1396 if (link->l_info_ops) 1397 release_link_info(link); 1398 1399 if ((err = io->io_alloc(link)) < 0) 1400 return err; 1401 1402 link->l_info_ops = io; 1403 1404 return 0; 1405 } 1406 1407 /** 1408 * Return info type of a link 1409 * @arg link link object 1410 * 1411 * @note The returned pointer is only valid as long as the link exists 1412 * @return Info type name or NULL if unknown. 1413 */ 1414 char *rtnl_link_get_info_type(struct rtnl_link *link) 1415 { 1416 if (link->l_info_ops) 1417 return link->l_info_ops->io_name; 1418 else 1419 return NULL; 1420 } 1421 1422 /** @} */ 1423 1424 static struct nl_object_ops link_obj_ops = { 1425 .oo_name = "route/link", 1426 .oo_size = sizeof(struct rtnl_link), 1427 .oo_free_data = link_free_data, 1428 .oo_clone = link_clone, 1429 .oo_dump = { 1430 [NL_DUMP_LINE] = link_dump_line, 1431 [NL_DUMP_DETAILS] = link_dump_details, 1432 [NL_DUMP_STATS] = link_dump_stats, 1433 [NL_DUMP_ENV] = link_dump_env, 1434 }, 1435 .oo_compare = link_compare, 1436 .oo_attrs2str = link_attrs2str, 1437 .oo_id_attrs = LINK_ATTR_IFINDEX, 1438 }; 1439 1440 static struct nl_af_group link_groups[] = { 1441 { AF_UNSPEC, RTNLGRP_LINK }, 1442 { END_OF_GROUP_LIST }, 1443 }; 1444 1445 static struct nl_cache_ops rtnl_link_ops = { 1446 .co_name = "route/link", 1447 .co_hdrsize = sizeof(struct ifinfomsg), 1448 .co_msgtypes = { 1449 { RTM_NEWLINK, NL_ACT_NEW, "new" }, 1450 { RTM_DELLINK, NL_ACT_DEL, "del" }, 1451 { RTM_GETLINK, NL_ACT_GET, "get" }, 1452 END_OF_MSGTYPES_LIST, 1453 }, 1454 .co_protocol = NETLINK_ROUTE, 1455 .co_groups = link_groups, 1456 .co_request_update = link_request_update, 1457 .co_msg_parser = link_msg_parser, 1458 .co_obj_ops = &link_obj_ops, 1459 }; 1460 1461 static void __init link_init(void) 1462 { 1463 nl_cache_mngt_register(&rtnl_link_ops); 1464 } 1465 1466 static void __exit link_exit(void) 1467 { 1468 nl_cache_mngt_unregister(&rtnl_link_ops); 1469 } 1470 1471 /** @} */ 1472
