link.c revision ef50a38fbd8682a5c9efd559e7db68664977f080
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@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 180static struct nl_cache_ops rtnl_link_ops; 181static struct nl_object_ops link_obj_ops; 182/** @endcond */ 183 184static 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 195static 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 210static 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 233static 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 250static 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 256static 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 if (err < 0) 421 goto errout; 422 423 err = P_ACCEPT; 424 425errout: 426 rtnl_link_put(link); 427 return err; 428} 429 430static int link_request_update(struct nl_cache *cache, struct nl_sock *sk) 431{ 432 return nl_rtgen_request(sk, RTM_GETLINK, AF_UNSPEC, NLM_F_DUMP); 433} 434 435static int link_dump_brief(struct nl_object *obj, struct nl_dump_params *p) 436{ 437 char buf[128]; 438 struct nl_cache *cache = dp_cache(obj); 439 struct rtnl_link *link = (struct rtnl_link *) obj; 440 int line = 1; 441 442 dp_dump(p, "%s %s ", link->l_name, 443 nl_llproto2str(link->l_arptype, buf, sizeof(buf))); 444 445 if (link->l_addr && !nl_addr_iszero(link->l_addr)) 446 dp_dump(p, "%s ", nl_addr2str(link->l_addr, buf, sizeof(buf))); 447 448 if (link->ce_mask & LINK_ATTR_MASTER) { 449 struct rtnl_link *master = rtnl_link_get(cache, link->l_master); 450 dp_dump(p, "master %s ", master ? master->l_name : "inv"); 451 if (master) 452 rtnl_link_put(master); 453 } 454 455 rtnl_link_flags2str(link->l_flags, buf, sizeof(buf)); 456 if (buf[0]) 457 dp_dump(p, "<%s> ", buf); 458 459 if (link->ce_mask & LINK_ATTR_LINK) { 460 struct rtnl_link *ll = rtnl_link_get(cache, link->l_link); 461 dp_dump(p, "slave-of %s ", ll ? ll->l_name : "NONE"); 462 if (ll) 463 rtnl_link_put(ll); 464 } 465 466 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_BRIEF]) 467 line = link->l_info_ops->io_dump[NL_DUMP_BRIEF](link, p, line); 468 469 dp_dump(p, "\n"); 470 471 return line; 472} 473 474static int link_dump_full(struct nl_object *obj, struct nl_dump_params *p) 475{ 476 struct rtnl_link *link = (struct rtnl_link *) obj; 477 char buf[64]; 478 int line; 479 480 line = link_dump_brief(obj, p); 481 dp_new_line(p, line++); 482 483 dp_dump(p, " mtu %u ", link->l_mtu); 484 dp_dump(p, "txqlen %u weight %u ", link->l_txqlen, link->l_weight); 485 486 if (link->ce_mask & LINK_ATTR_QDISC) 487 dp_dump(p, "qdisc %s ", link->l_qdisc); 488 489 if (link->ce_mask & LINK_ATTR_MAP && link->l_map.lm_irq) 490 dp_dump(p, "irq %u ", link->l_map.lm_irq); 491 492 if (link->ce_mask & LINK_ATTR_IFINDEX) 493 dp_dump(p, "index %u ", link->l_index); 494 495 496 dp_dump(p, "\n"); 497 dp_new_line(p, line++); 498 499 dp_dump(p, " "); 500 501 if (link->ce_mask & LINK_ATTR_BRD) 502 dp_dump(p, "brd %s ", nl_addr2str(link->l_bcast, buf, 503 sizeof(buf))); 504 505 if ((link->ce_mask & LINK_ATTR_OPERSTATE) && 506 link->l_operstate != IF_OPER_UNKNOWN) { 507 rtnl_link_operstate2str(link->l_operstate, buf, sizeof(buf)); 508 dp_dump(p, "state %s ", buf); 509 } 510 511 dp_dump(p, "mode %s\n", 512 rtnl_link_mode2str(link->l_linkmode, buf, sizeof(buf))); 513 514 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_FULL]) 515 line = link->l_info_ops->io_dump[NL_DUMP_FULL](link, p, line); 516 517 return line; 518} 519 520static int link_dump_stats(struct nl_object *obj, struct nl_dump_params *p) 521{ 522 struct rtnl_link *link = (struct rtnl_link *) obj; 523 char *unit, fmt[64]; 524 float res; 525 int line; 526 527 line = link_dump_full(obj, p); 528 529 dp_dump_line(p, line++, " Stats: bytes packets errors " 530 " dropped fifo-err compressed\n"); 531 532 res = nl_cancel_down_bytes(link->l_stats[RTNL_LINK_RX_BYTES], &unit); 533 534 strcpy(fmt, " RX %X.2f %s %10llu %10llu %10llu %10llu %10llu\n"); 535 fmt[9] = *unit == 'B' ? '9' : '7'; 536 537 dp_dump_line(p, line++, fmt, 538 res, unit, 539 link->l_stats[RTNL_LINK_RX_PACKETS], 540 link->l_stats[RTNL_LINK_RX_ERRORS], 541 link->l_stats[RTNL_LINK_RX_DROPPED], 542 link->l_stats[RTNL_LINK_RX_FIFO_ERR], 543 link->l_stats[RTNL_LINK_RX_COMPRESSED]); 544 545 res = nl_cancel_down_bytes(link->l_stats[RTNL_LINK_TX_BYTES], &unit); 546 547 strcpy(fmt, " TX %X.2f %s %10llu %10llu %10llu %10llu %10llu\n"); 548 fmt[9] = *unit == 'B' ? '9' : '7'; 549 550 dp_dump_line(p, line++, fmt, 551 res, unit, 552 link->l_stats[RTNL_LINK_TX_PACKETS], 553 link->l_stats[RTNL_LINK_TX_ERRORS], 554 link->l_stats[RTNL_LINK_TX_DROPPED], 555 link->l_stats[RTNL_LINK_TX_FIFO_ERR], 556 link->l_stats[RTNL_LINK_TX_COMPRESSED]); 557 558 dp_dump_line(p, line++, " Errors: length over crc " 559 " frame missed multicast\n"); 560 561 dp_dump_line(p, line++, " RX %10" PRIu64 " %10" PRIu64 " %10" 562 PRIu64 " %10" PRIu64 " %10" PRIu64 " %10" 563 PRIu64 "\n", 564 link->l_stats[RTNL_LINK_RX_LEN_ERR], 565 link->l_stats[RTNL_LINK_RX_OVER_ERR], 566 link->l_stats[RTNL_LINK_RX_CRC_ERR], 567 link->l_stats[RTNL_LINK_RX_FRAME_ERR], 568 link->l_stats[RTNL_LINK_RX_MISSED_ERR], 569 link->l_stats[RTNL_LINK_MULTICAST]); 570 571 dp_dump_line(p, line++, " aborted carrier heartbeat " 572 " window collision\n"); 573 574 dp_dump_line(p, line++, " TX %10" PRIu64 " %10" PRIu64 " %10" 575 PRIu64 " %10" PRIu64 " %10" PRIu64 "\n", 576 link->l_stats[RTNL_LINK_TX_ABORT_ERR], 577 link->l_stats[RTNL_LINK_TX_CARRIER_ERR], 578 link->l_stats[RTNL_LINK_TX_HBEAT_ERR], 579 link->l_stats[RTNL_LINK_TX_WIN_ERR], 580 link->l_stats[RTNL_LINK_TX_COLLISIONS]); 581 582 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_STATS]) 583 line = link->l_info_ops->io_dump[NL_DUMP_STATS](link, p, line); 584 585 return line; 586} 587 588static int link_dump_xml(struct nl_object *obj, struct nl_dump_params *p) 589{ 590 struct rtnl_link *link = (struct rtnl_link *) obj; 591 struct nl_cache *cache = dp_cache(obj); 592 char buf[128]; 593 int i, line = 0; 594 595 dp_dump_line(p, line++, "<link name=\"%s\" index=\"%u\">\n", 596 link->l_name, link->l_index); 597 dp_dump_line(p, line++, " <family>%s</family>\n", 598 nl_af2str(link->l_family, buf, sizeof(buf))); 599 dp_dump_line(p, line++, " <arptype>%s</arptype>\n", 600 nl_llproto2str(link->l_arptype, buf, sizeof(buf))); 601 dp_dump_line(p, line++, " <address>%s</address>\n", 602 nl_addr2str(link->l_addr, buf, sizeof(buf))); 603 dp_dump_line(p, line++, " <mtu>%u</mtu>\n", link->l_mtu); 604 dp_dump_line(p, line++, " <txqlen>%u</txqlen>\n", link->l_txqlen); 605 dp_dump_line(p, line++, " <weight>%u</weight>\n", link->l_weight); 606 607 rtnl_link_flags2str(link->l_flags, buf, sizeof(buf)); 608 if (buf[0]) 609 dp_dump_line(p, line++, " <flags>%s</flags>\n", buf); 610 611 if (link->ce_mask & LINK_ATTR_QDISC) 612 dp_dump_line(p, line++, " <qdisc>%s</qdisc>\n", link->l_qdisc); 613 614 if (link->ce_mask & LINK_ATTR_LINK) { 615 struct rtnl_link *ll = rtnl_link_get(cache, link->l_link); 616 dp_dump_line(p, line++, " <link>%s</link>\n", 617 ll ? ll->l_name : "none"); 618 if (ll) 619 rtnl_link_put(ll); 620 } 621 622 if (link->ce_mask & LINK_ATTR_MASTER) { 623 struct rtnl_link *master = rtnl_link_get(cache, link->l_master); 624 dp_dump_line(p, line++, " <master>%s</master>\n", 625 master ? master->l_name : "none"); 626 if (master) 627 rtnl_link_put(master); 628 } 629 630 if (link->ce_mask & LINK_ATTR_BRD) 631 dp_dump_line(p, line++, " <broadcast>%s</broadcast>\n", 632 nl_addr2str(link->l_bcast, buf, sizeof(buf))); 633 634 if (link->ce_mask & LINK_ATTR_STATS) { 635 dp_dump_line(p, line++, " <stats>\n"); 636 for (i = 0; i <= RTNL_LINK_STATS_MAX; i++) { 637 rtnl_link_stat2str(i, buf, sizeof(buf)); 638 dp_dump_line(p, line++, 639 " <%s>%" PRIu64 "</%s>\n", 640 buf, link->l_stats[i], buf); 641 } 642 dp_dump_line(p, line++, " </stats>\n"); 643 } 644 645 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_XML]) { 646 dp_dump_line(p, line++, " <info>\n"); 647 line = link->l_info_ops->io_dump[NL_DUMP_XML](link, p, line); 648 dp_dump_line(p, line++, " </info>\n"); 649 } 650 651 dp_dump_line(p, line++, "</link>\n"); 652 653#if 0 654 uint32_t l_change; /**< Change mask */ 655 struct rtnl_lifmap l_map; /**< Interface device mapping */ 656#endif 657 658 return line; 659} 660 661static int link_dump_env(struct nl_object *obj, struct nl_dump_params *p) 662{ 663 struct rtnl_link *link = (struct rtnl_link *) obj; 664 struct nl_cache *cache = dp_cache(obj); 665 char buf[128]; 666 int i, line = 0; 667 668 dp_dump_line(p, line++, "LINK_NAME=%s\n", link->l_name); 669 dp_dump_line(p, line++, "LINK_IFINDEX=%u\n", link->l_index); 670 dp_dump_line(p, line++, "LINK_FAMILY=%s\n", 671 nl_af2str(link->l_family, buf, sizeof(buf))); 672 dp_dump_line(p, line++, "LINK_TYPE=%s\n", 673 nl_llproto2str(link->l_arptype, buf, sizeof(buf))); 674 if (link->ce_mask & LINK_ATTR_ADDR) 675 dp_dump_line(p, line++, "LINK_ADDRESS=%s\n", 676 nl_addr2str(link->l_addr, buf, sizeof(buf))); 677 dp_dump_line(p, line++, "LINK_MTU=%u\n", link->l_mtu); 678 dp_dump_line(p, line++, "LINK_TXQUEUELEN=%u\n", link->l_txqlen); 679 dp_dump_line(p, line++, "LINK_WEIGHT=%u\n", link->l_weight); 680 681 rtnl_link_flags2str(link->l_flags & ~IFF_RUNNING, buf, sizeof(buf)); 682 if (buf[0]) 683 dp_dump_line(p, line++, "LINK_FLAGS=%s\n", buf); 684 685 if (link->ce_mask & LINK_ATTR_QDISC) 686 dp_dump_line(p, line++, "LINK_QDISC=%s\n", link->l_qdisc); 687 688 if (link->ce_mask & LINK_ATTR_LINK) { 689 struct rtnl_link *ll = rtnl_link_get(cache, link->l_link); 690 691 dp_dump_line(p, line++, "LINK_LINK_IFINDEX=%d\n", link->l_link); 692 if (ll) { 693 dp_dump_line(p, line++, "LINK_LINK_IFNAME=%s\n", 694 ll->l_name); 695 rtnl_link_put(ll); 696 } 697 } 698 699 if (link->ce_mask & LINK_ATTR_MASTER) { 700 struct rtnl_link *master = rtnl_link_get(cache, link->l_master); 701 dp_dump_line(p, line++, "LINK_MASTER=%s\n", 702 master ? master->l_name : "none"); 703 if (master) 704 rtnl_link_put(master); 705 } 706 707 if (link->ce_mask & LINK_ATTR_BRD) 708 dp_dump_line(p, line++, "LINK_BROADCAST=%s\n", 709 nl_addr2str(link->l_bcast, buf, sizeof(buf))); 710 711 if (link->ce_mask & LINK_ATTR_STATS) { 712 for (i = 0; i <= RTNL_LINK_STATS_MAX; i++) { 713 char *c = buf; 714 715 sprintf(buf, "LINK_"); 716 rtnl_link_stat2str(i, buf + 5, sizeof(buf) - 5); 717 while (*c) { 718 *c = toupper(*c); 719 c++; 720 } 721 dp_dump_line(p, line++, 722 "%s=%" PRIu64 "\n", buf, link->l_stats[i]); 723 } 724 } 725 726 if (link->l_info_ops && link->l_info_ops->io_dump[NL_DUMP_ENV]) 727 line = link->l_info_ops->io_dump[NL_DUMP_ENV](link, p, line); 728 729 return line; 730} 731 732#if 0 733static int link_handle_event(struct nl_object *a, struct rtnl_link_event_cb *cb) 734{ 735 struct rtnl_link *l = (struct rtnl_link *) a; 736 struct nl_cache *c = dp_cache(a); 737 int nevents = 0; 738 739 if (l->l_change == ~0U) { 740 if (l->ce_msgtype == RTM_NEWLINK) 741 cb->le_register(l); 742 else 743 cb->le_unregister(l); 744 745 return 1; 746 } 747 748 if (l->l_change & IFF_SLAVE) { 749 if (l->l_flags & IFF_SLAVE) { 750 struct rtnl_link *m = rtnl_link_get(c, l->l_master); 751 cb->le_new_bonding(l, m); 752 if (m) 753 rtnl_link_put(m); 754 } else 755 cb->le_cancel_bonding(l); 756 } 757 758#if 0 759 if (l->l_change & IFF_UP && l->l_change & IFF_RUNNING) 760 dp_dump_line(p, line++, "link %s changed state to %s.\n", 761 l->l_name, l->l_flags & IFF_UP ? "up" : "down"); 762 763 if (l->l_change & IFF_PROMISC) { 764 dp_new_line(p, line++); 765 dp_dump(p, "link %s %s promiscuous mode.\n", 766 l->l_name, l->l_flags & IFF_PROMISC ? "entered" : "left"); 767 } 768 769 if (line == 0) 770 dp_dump_line(p, line++, "link %s sent unknown event.\n", 771 l->l_name); 772#endif 773 774 return nevents; 775} 776#endif 777 778static int link_compare(struct nl_object *_a, struct nl_object *_b, 779 uint32_t attrs, int flags) 780{ 781 struct rtnl_link *a = (struct rtnl_link *) _a; 782 struct rtnl_link *b = (struct rtnl_link *) _b; 783 int diff = 0; 784 785#define LINK_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, LINK_ATTR_##ATTR, a, b, EXPR) 786 787 diff |= LINK_DIFF(IFINDEX, a->l_index != b->l_index); 788 diff |= LINK_DIFF(MTU, a->l_mtu != b->l_mtu); 789 diff |= LINK_DIFF(LINK, a->l_link != b->l_link); 790 diff |= LINK_DIFF(TXQLEN, a->l_txqlen != b->l_txqlen); 791 diff |= LINK_DIFF(WEIGHT, a->l_weight != b->l_weight); 792 diff |= LINK_DIFF(MASTER, a->l_master != b->l_master); 793 diff |= LINK_DIFF(FAMILY, a->l_family != b->l_family); 794 diff |= LINK_DIFF(OPERSTATE, a->l_operstate != b->l_operstate); 795 diff |= LINK_DIFF(LINKMODE, a->l_linkmode != b->l_linkmode); 796 diff |= LINK_DIFF(QDISC, strcmp(a->l_qdisc, b->l_qdisc)); 797 diff |= LINK_DIFF(IFNAME, strcmp(a->l_name, b->l_name)); 798 diff |= LINK_DIFF(ADDR, nl_addr_cmp(a->l_addr, b->l_addr)); 799 diff |= LINK_DIFF(BRD, nl_addr_cmp(a->l_bcast, b->l_bcast)); 800 801 if (flags & LOOSE_COMPARISON) 802 diff |= LINK_DIFF(FLAGS, 803 (a->l_flags ^ b->l_flags) & b->l_flag_mask); 804 else 805 diff |= LINK_DIFF(FLAGS, a->l_flags != b->l_flags); 806 807#undef LINK_DIFF 808 809 return diff; 810} 811 812static struct trans_tbl link_attrs[] = { 813 __ADD(LINK_ATTR_MTU, mtu) 814 __ADD(LINK_ATTR_LINK, link) 815 __ADD(LINK_ATTR_TXQLEN, txqlen) 816 __ADD(LINK_ATTR_WEIGHT, weight) 817 __ADD(LINK_ATTR_MASTER, master) 818 __ADD(LINK_ATTR_QDISC, qdisc) 819 __ADD(LINK_ATTR_MAP, map) 820 __ADD(LINK_ATTR_ADDR, address) 821 __ADD(LINK_ATTR_BRD, broadcast) 822 __ADD(LINK_ATTR_FLAGS, flags) 823 __ADD(LINK_ATTR_IFNAME, name) 824 __ADD(LINK_ATTR_IFINDEX, ifindex) 825 __ADD(LINK_ATTR_FAMILY, family) 826 __ADD(LINK_ATTR_ARPTYPE, arptype) 827 __ADD(LINK_ATTR_STATS, stats) 828 __ADD(LINK_ATTR_CHANGE, change) 829 __ADD(LINK_ATTR_OPERSTATE, operstate) 830 __ADD(LINK_ATTR_LINKMODE, linkmode) 831}; 832 833static char *link_attrs2str(int attrs, char *buf, size_t len) 834{ 835 return __flags2str(attrs, buf, len, link_attrs, 836 ARRAY_SIZE(link_attrs)); 837} 838 839/** 840 * @name Allocation/Freeing 841 * @{ 842 */ 843 844struct rtnl_link *rtnl_link_alloc(void) 845{ 846 return (struct rtnl_link *) nl_object_alloc(&link_obj_ops); 847} 848 849void rtnl_link_put(struct rtnl_link *link) 850{ 851 nl_object_put((struct nl_object *) link); 852} 853 854/** @} */ 855 856/** 857 * @name Cache Management 858 * @{ 859 */ 860 861 862/** 863 * Allocate link cache and fill in all configured links. 864 * @arg sk Netlink socket. 865 * @arg result Pointer to store resulting cache. 866 * 867 * Allocates a new link cache, initializes it properly and updates it 868 * to include all links currently configured in the kernel. 869 * 870 * @return 0 on success or a negative error code. 871 */ 872int rtnl_link_alloc_cache(struct nl_sock *sk, struct nl_cache **result) 873{ 874 return nl_cache_alloc_and_fill(&rtnl_link_ops, sk, result); 875} 876 877/** 878 * Look up link by interface index in the provided cache 879 * @arg cache link cache 880 * @arg ifindex link interface index 881 * 882 * The caller owns a reference on the returned object and 883 * must give the object back via rtnl_link_put(). 884 * 885 * @return pointer to link inside the cache or NULL if no match was found. 886 */ 887struct rtnl_link *rtnl_link_get(struct nl_cache *cache, int ifindex) 888{ 889 struct rtnl_link *link; 890 891 if (cache->c_ops != &rtnl_link_ops) 892 return NULL; 893 894 nl_list_for_each_entry(link, &cache->c_items, ce_list) { 895 if (link->l_index == ifindex) { 896 nl_object_get((struct nl_object *) link); 897 return link; 898 } 899 } 900 901 return NULL; 902} 903 904/** 905 * Look up link by link name in the provided cache 906 * @arg cache link cache 907 * @arg name link name 908 * 909 * The caller owns a reference on the returned object and 910 * must give the object back via rtnl_link_put(). 911 * 912 * @return pointer to link inside the cache or NULL if no match was found. 913 */ 914struct rtnl_link *rtnl_link_get_by_name(struct nl_cache *cache, 915 const char *name) 916{ 917 struct rtnl_link *link; 918 919 if (cache->c_ops != &rtnl_link_ops) 920 return NULL; 921 922 nl_list_for_each_entry(link, &cache->c_items, ce_list) { 923 if (!strcmp(name, link->l_name)) { 924 nl_object_get((struct nl_object *) link); 925 return link; 926 } 927 } 928 929 return NULL; 930} 931 932/** @} */ 933 934/** 935 * @name Link Modifications 936 * @{ 937 */ 938 939/** 940 * Builds a netlink change request message to change link attributes 941 * @arg old link to be changed 942 * @arg tmpl template with requested changes 943 * @arg flags additional netlink message flags 944 * 945 * Builds a new netlink message requesting a change of link attributes. 946 * The netlink message header isn't fully equipped with all relevant 947 * fields and must be sent out via nl_send_auto_complete() or 948 * supplemented as needed. 949 * \a old must point to a link currently configured in the kernel 950 * and \a tmpl must contain the attributes to be changed set via 951 * \c rtnl_link_set_* functions. 952 * 953 * @return New netlink message 954 * @note Not all attributes can be changed, see 955 * \ref link_changeable "Changeable Attributes" for more details. 956 */ 957int rtnl_link_build_change_request(struct rtnl_link *old, 958 struct rtnl_link *tmpl, int flags, 959 struct nl_msg **result) 960{ 961 struct nl_msg *msg; 962 struct ifinfomsg ifi = { 963 .ifi_family = old->l_family, 964 .ifi_index = old->l_index, 965 }; 966 967 if (tmpl->ce_mask & LINK_ATTR_FLAGS) { 968 ifi.ifi_flags = old->l_flags & ~tmpl->l_flag_mask; 969 ifi.ifi_flags |= tmpl->l_flags; 970 } 971 972 msg = nlmsg_alloc_simple(RTM_SETLINK, flags); 973 if (!msg) 974 return -NLE_NOMEM; 975 976 if (nlmsg_append(msg, &ifi, sizeof(ifi), NLMSG_ALIGNTO) < 0) 977 goto nla_put_failure; 978 979 if (tmpl->ce_mask & LINK_ATTR_ADDR) 980 NLA_PUT_ADDR(msg, IFLA_ADDRESS, tmpl->l_addr); 981 982 if (tmpl->ce_mask & LINK_ATTR_BRD) 983 NLA_PUT_ADDR(msg, IFLA_BROADCAST, tmpl->l_bcast); 984 985 if (tmpl->ce_mask & LINK_ATTR_MTU) 986 NLA_PUT_U32(msg, IFLA_MTU, tmpl->l_mtu); 987 988 if (tmpl->ce_mask & LINK_ATTR_TXQLEN) 989 NLA_PUT_U32(msg, IFLA_TXQLEN, tmpl->l_txqlen); 990 991 if (tmpl->ce_mask & LINK_ATTR_WEIGHT) 992 NLA_PUT_U32(msg, IFLA_WEIGHT, tmpl->l_weight); 993 994 if (tmpl->ce_mask & LINK_ATTR_IFNAME) 995 NLA_PUT_STRING(msg, IFLA_IFNAME, tmpl->l_name); 996 997 if (tmpl->ce_mask & LINK_ATTR_OPERSTATE) 998 NLA_PUT_U8(msg, IFLA_OPERSTATE, tmpl->l_operstate); 999 1000 if (tmpl->ce_mask & LINK_ATTR_LINKMODE) 1001 NLA_PUT_U8(msg, IFLA_LINKMODE, tmpl->l_linkmode); 1002 1003 if ((tmpl->ce_mask & LINK_ATTR_LINKINFO) && tmpl->l_info_ops && 1004 tmpl->l_info_ops->io_put_attrs) { 1005 struct nlattr *info; 1006 1007 if (!(info = nla_nest_start(msg, IFLA_LINKINFO))) 1008 goto nla_put_failure; 1009 1010 NLA_PUT_STRING(msg, IFLA_INFO_KIND, tmpl->l_info_ops->io_name); 1011 1012 if (tmpl->l_info_ops->io_put_attrs(msg, tmpl) < 0) 1013 goto nla_put_failure; 1014 1015 nla_nest_end(msg, info); 1016 } 1017 1018 *result = msg; 1019 return 0; 1020 1021nla_put_failure: 1022 nlmsg_free(msg); 1023 return -NLE_MSGSIZE; 1024} 1025 1026/** 1027 * Change link attributes 1028 * @arg sk Netlink socket. 1029 * @arg old link to be changed 1030 * @arg tmpl template with requested changes 1031 * @arg flags additional netlink message flags 1032 * 1033 * Builds a new netlink message by calling rtnl_link_build_change_request(), 1034 * sends the request to the kernel and waits for the next ACK to be 1035 * received, i.e. blocks until the request has been processed. 1036 * 1037 * @return 0 on success or a negative error code 1038 * @note Not all attributes can be changed, see 1039 * \ref link_changeable "Changeable Attributes" for more details. 1040 */ 1041int rtnl_link_change(struct nl_sock *sk, struct rtnl_link *old, 1042 struct rtnl_link *tmpl, int flags) 1043{ 1044 struct nl_msg *msg; 1045 int err; 1046 1047 if ((err = rtnl_link_build_change_request(old, tmpl, flags, &msg)) < 0) 1048 return err; 1049 1050 err = nl_send_auto_complete(sk, msg); 1051 nlmsg_free(msg); 1052 if (err < 0) 1053 return err; 1054 1055 return nl_wait_for_ack(sk); 1056} 1057 1058/** @} */ 1059 1060/** 1061 * @name Name <-> Index Translations 1062 * @{ 1063 */ 1064 1065/** 1066 * Translate an interface index to the corresponding link name 1067 * @arg cache link cache 1068 * @arg ifindex link interface index 1069 * @arg dst destination buffer 1070 * @arg len length of destination buffer 1071 * 1072 * Translates the specified interface index to the corresponding 1073 * link name and stores the name in the destination buffer. 1074 * 1075 * @return link name or NULL if no match was found. 1076 */ 1077char * rtnl_link_i2name(struct nl_cache *cache, int ifindex, char *dst, 1078 size_t len) 1079{ 1080 struct rtnl_link *link = rtnl_link_get(cache, ifindex); 1081 1082 if (link) { 1083 strncpy(dst, link->l_name, len - 1); 1084 rtnl_link_put(link); 1085 return dst; 1086 } 1087 1088 return NULL; 1089} 1090 1091/** 1092 * Translate a link name to the corresponding interface index 1093 * @arg cache link cache 1094 * @arg name link name 1095 * 1096 * @return interface index or 0 if no match was found. 1097 */ 1098int rtnl_link_name2i(struct nl_cache *cache, const char *name) 1099{ 1100 int ifindex = 0; 1101 struct rtnl_link *link; 1102 1103 link = rtnl_link_get_by_name(cache, name); 1104 if (link) { 1105 ifindex = link->l_index; 1106 rtnl_link_put(link); 1107 } 1108 1109 return ifindex; 1110} 1111 1112/** @} */ 1113 1114/** 1115 * @name Link Flags Translations 1116 * @{ 1117 */ 1118 1119static struct trans_tbl link_flags[] = { 1120 __ADD(IFF_LOOPBACK, loopback) 1121 __ADD(IFF_BROADCAST, broadcast) 1122 __ADD(IFF_POINTOPOINT, pointopoint) 1123 __ADD(IFF_MULTICAST, multicast) 1124 __ADD(IFF_NOARP, noarp) 1125 __ADD(IFF_ALLMULTI, allmulti) 1126 __ADD(IFF_PROMISC, promisc) 1127 __ADD(IFF_MASTER, master) 1128 __ADD(IFF_SLAVE, slave) 1129 __ADD(IFF_DEBUG, debug) 1130 __ADD(IFF_DYNAMIC, dynamic) 1131 __ADD(IFF_AUTOMEDIA, automedia) 1132 __ADD(IFF_PORTSEL, portsel) 1133 __ADD(IFF_NOTRAILERS, notrailers) 1134 __ADD(IFF_UP, up) 1135 __ADD(IFF_RUNNING, running) 1136 __ADD(IFF_LOWER_UP, lowerup) 1137 __ADD(IFF_DORMANT, dormant) 1138 __ADD(IFF_ECHO, echo) 1139}; 1140 1141char * rtnl_link_flags2str(int flags, char *buf, size_t len) 1142{ 1143 return __flags2str(flags, buf, len, link_flags, 1144 ARRAY_SIZE(link_flags)); 1145} 1146 1147int rtnl_link_str2flags(const char *name) 1148{ 1149 return __str2flags(name, link_flags, ARRAY_SIZE(link_flags)); 1150} 1151 1152/** @} */ 1153 1154/** 1155 * @name Link Statistics Translations 1156 * @{ 1157 */ 1158 1159static struct trans_tbl link_stats[] = { 1160 __ADD(RTNL_LINK_RX_PACKETS, rx_packets) 1161 __ADD(RTNL_LINK_TX_PACKETS, tx_packets) 1162 __ADD(RTNL_LINK_RX_BYTES, rx_bytes) 1163 __ADD(RTNL_LINK_TX_BYTES, tx_bytes) 1164 __ADD(RTNL_LINK_RX_ERRORS, rx_errors) 1165 __ADD(RTNL_LINK_TX_ERRORS, tx_errors) 1166 __ADD(RTNL_LINK_RX_DROPPED, rx_dropped) 1167 __ADD(RTNL_LINK_TX_DROPPED, tx_dropped) 1168 __ADD(RTNL_LINK_RX_COMPRESSED, rx_compressed) 1169 __ADD(RTNL_LINK_TX_COMPRESSED, tx_compressed) 1170 __ADD(RTNL_LINK_RX_FIFO_ERR, rx_fifo_err) 1171 __ADD(RTNL_LINK_TX_FIFO_ERR, tx_fifo_err) 1172 __ADD(RTNL_LINK_RX_LEN_ERR, rx_len_err) 1173 __ADD(RTNL_LINK_RX_OVER_ERR, rx_over_err) 1174 __ADD(RTNL_LINK_RX_CRC_ERR, rx_crc_err) 1175 __ADD(RTNL_LINK_RX_FRAME_ERR, rx_frame_err) 1176 __ADD(RTNL_LINK_RX_MISSED_ERR, rx_missed_err) 1177 __ADD(RTNL_LINK_TX_ABORT_ERR, tx_abort_err) 1178 __ADD(RTNL_LINK_TX_CARRIER_ERR, tx_carrier_err) 1179 __ADD(RTNL_LINK_TX_HBEAT_ERR, tx_hbeat_err) 1180 __ADD(RTNL_LINK_TX_WIN_ERR, tx_win_err) 1181 __ADD(RTNL_LINK_TX_COLLISIONS, tx_collision) 1182 __ADD(RTNL_LINK_MULTICAST, multicast) 1183}; 1184 1185char *rtnl_link_stat2str(int st, char *buf, size_t len) 1186{ 1187 return __type2str(st, buf, len, link_stats, ARRAY_SIZE(link_stats)); 1188} 1189 1190int rtnl_link_str2stat(const char *name) 1191{ 1192 return __str2type(name, link_stats, ARRAY_SIZE(link_stats)); 1193} 1194 1195/** @} */ 1196 1197/** 1198 * @name Link Operstate Translations 1199 * @{ 1200 */ 1201 1202static struct trans_tbl link_operstates[] = { 1203 __ADD(IF_OPER_UNKNOWN, unknown) 1204 __ADD(IF_OPER_NOTPRESENT, notpresent) 1205 __ADD(IF_OPER_DOWN, down) 1206 __ADD(IF_OPER_LOWERLAYERDOWN, lowerlayerdown) 1207 __ADD(IF_OPER_TESTING, testing) 1208 __ADD(IF_OPER_DORMANT, dormant) 1209 __ADD(IF_OPER_UP, up) 1210}; 1211 1212char *rtnl_link_operstate2str(int st, char *buf, size_t len) 1213{ 1214 return __type2str(st, buf, len, link_operstates, 1215 ARRAY_SIZE(link_operstates)); 1216} 1217 1218int rtnl_link_str2operstate(const char *name) 1219{ 1220 return __str2type(name, link_operstates, 1221 ARRAY_SIZE(link_operstates)); 1222} 1223 1224/** @} */ 1225 1226/** 1227 * @name Link Mode Translations 1228 * @{ 1229 */ 1230 1231static struct trans_tbl link_modes[] = { 1232 __ADD(IF_LINK_MODE_DEFAULT, default) 1233 __ADD(IF_LINK_MODE_DORMANT, dormant) 1234}; 1235 1236char *rtnl_link_mode2str(int st, char *buf, size_t len) 1237{ 1238 return __type2str(st, buf, len, link_modes, ARRAY_SIZE(link_modes)); 1239} 1240 1241int rtnl_link_str2mode(const char *name) 1242{ 1243 return __str2type(name, link_modes, ARRAY_SIZE(link_modes)); 1244} 1245 1246/** @} */ 1247 1248/** 1249 * @name Attributes 1250 * @{ 1251 */ 1252 1253void rtnl_link_set_qdisc(struct rtnl_link *link, const char *qdisc) 1254{ 1255 strncpy(link->l_qdisc, qdisc, sizeof(link->l_qdisc) - 1); 1256 link->ce_mask |= LINK_ATTR_QDISC; 1257} 1258 1259char *rtnl_link_get_qdisc(struct rtnl_link *link) 1260{ 1261 if (link->ce_mask & LINK_ATTR_QDISC) 1262 return link->l_qdisc; 1263 else 1264 return NULL; 1265} 1266 1267void rtnl_link_set_name(struct rtnl_link *link, const char *name) 1268{ 1269 strncpy(link->l_name, name, sizeof(link->l_name) - 1); 1270 link->ce_mask |= LINK_ATTR_IFNAME; 1271} 1272 1273char *rtnl_link_get_name(struct rtnl_link *link) 1274{ 1275 if (link->ce_mask & LINK_ATTR_IFNAME) 1276 return link->l_name; 1277 else 1278 return NULL; 1279} 1280 1281static inline void __assign_addr(struct rtnl_link *link, struct nl_addr **pos, 1282 struct nl_addr *new, int flag) 1283{ 1284 if (*pos) 1285 nl_addr_put(*pos); 1286 1287 nl_addr_get(new); 1288 *pos = new; 1289 1290 link->ce_mask |= flag; 1291} 1292 1293void rtnl_link_set_addr(struct rtnl_link *link, struct nl_addr *addr) 1294{ 1295 __assign_addr(link, &link->l_addr, addr, LINK_ATTR_ADDR); 1296} 1297 1298struct nl_addr *rtnl_link_get_addr(struct rtnl_link *link) 1299{ 1300 if (link->ce_mask & LINK_ATTR_ADDR) 1301 return link->l_addr; 1302 else 1303 return NULL; 1304} 1305 1306void rtnl_link_set_broadcast(struct rtnl_link *link, struct nl_addr *brd) 1307{ 1308 __assign_addr(link, &link->l_bcast, brd, LINK_ATTR_BRD); 1309} 1310 1311struct nl_addr *rtnl_link_get_broadcast(struct rtnl_link *link) 1312{ 1313 if (link->ce_mask & LINK_ATTR_BRD) 1314 return link->l_bcast; 1315 else 1316 return NULL; 1317} 1318 1319void rtnl_link_set_flags(struct rtnl_link *link, unsigned int flags) 1320{ 1321 link->l_flag_mask |= flags; 1322 link->l_flags |= flags; 1323 link->ce_mask |= LINK_ATTR_FLAGS; 1324} 1325 1326void rtnl_link_unset_flags(struct rtnl_link *link, unsigned int flags) 1327{ 1328 link->l_flag_mask |= flags; 1329 link->l_flags &= ~flags; 1330 link->ce_mask |= LINK_ATTR_FLAGS; 1331} 1332 1333unsigned int rtnl_link_get_flags(struct rtnl_link *link) 1334{ 1335 return link->l_flags; 1336} 1337 1338void rtnl_link_set_family(struct rtnl_link *link, int family) 1339{ 1340 link->l_family = family; 1341 link->ce_mask |= LINK_ATTR_FAMILY; 1342} 1343 1344int rtnl_link_get_family(struct rtnl_link *link) 1345{ 1346 if (link->l_family & LINK_ATTR_FAMILY) 1347 return link->l_family; 1348 else 1349 return AF_UNSPEC; 1350} 1351 1352void rtnl_link_set_arptype(struct rtnl_link *link, unsigned int arptype) 1353{ 1354 link->l_arptype = arptype; 1355} 1356 1357unsigned int rtnl_link_get_arptype(struct rtnl_link *link) 1358{ 1359 return link->l_arptype; 1360} 1361 1362void rtnl_link_set_ifindex(struct rtnl_link *link, int ifindex) 1363{ 1364 link->l_index = ifindex; 1365 link->ce_mask |= LINK_ATTR_IFINDEX; 1366} 1367 1368int rtnl_link_get_ifindex(struct rtnl_link *link) 1369{ 1370 return link->l_index; 1371} 1372 1373void rtnl_link_set_mtu(struct rtnl_link *link, unsigned int mtu) 1374{ 1375 link->l_mtu = mtu; 1376 link->ce_mask |= LINK_ATTR_MTU; 1377} 1378 1379unsigned int rtnl_link_get_mtu(struct rtnl_link *link) 1380{ 1381 if (link->ce_mask & LINK_ATTR_MTU) 1382 return link->l_mtu; 1383 else 1384 return 0; 1385} 1386 1387void rtnl_link_set_txqlen(struct rtnl_link *link, unsigned int txqlen) 1388{ 1389 link->l_txqlen = txqlen; 1390 link->ce_mask |= LINK_ATTR_TXQLEN; 1391} 1392 1393unsigned int rtnl_link_get_txqlen(struct rtnl_link *link) 1394{ 1395 if (link->ce_mask & LINK_ATTR_TXQLEN) 1396 return link->l_txqlen; 1397 else 1398 return UINT_MAX; 1399} 1400 1401void rtnl_link_set_weight(struct rtnl_link *link, unsigned int weight) 1402{ 1403 link->l_weight = weight; 1404 link->ce_mask |= LINK_ATTR_WEIGHT; 1405} 1406 1407unsigned int rtnl_link_get_weight(struct rtnl_link *link) 1408{ 1409 if (link->ce_mask & LINK_ATTR_WEIGHT) 1410 return link->l_weight; 1411 else 1412 return UINT_MAX; 1413} 1414 1415void rtnl_link_set_link(struct rtnl_link *link, int ifindex) 1416{ 1417 link->l_link = ifindex; 1418 link->ce_mask |= LINK_ATTR_LINK; 1419} 1420 1421int rtnl_link_get_link(struct rtnl_link *link) 1422{ 1423 return link->l_link; 1424} 1425 1426void rtnl_link_set_master(struct rtnl_link *link, int ifindex) 1427{ 1428 link->l_master = ifindex; 1429 link->ce_mask |= LINK_ATTR_MASTER; 1430} 1431 1432int rtnl_link_get_master(struct rtnl_link *link) 1433{ 1434 return link->l_master; 1435} 1436 1437void rtnl_link_set_operstate(struct rtnl_link *link, uint8_t operstate) 1438{ 1439 link->l_operstate = operstate; 1440 link->ce_mask |= LINK_ATTR_OPERSTATE; 1441} 1442 1443uint8_t rtnl_link_get_operstate(struct rtnl_link *link) 1444{ 1445 if (link->ce_mask & LINK_ATTR_OPERSTATE) 1446 return link->l_operstate; 1447 else 1448 return IF_OPER_UNKNOWN; 1449} 1450 1451void rtnl_link_set_linkmode(struct rtnl_link *link, uint8_t linkmode) 1452{ 1453 link->l_linkmode = linkmode; 1454 link->ce_mask |= LINK_ATTR_LINKMODE; 1455} 1456 1457uint8_t rtnl_link_get_linkmode(struct rtnl_link *link) 1458{ 1459 if (link->ce_mask & LINK_ATTR_LINKMODE) 1460 return link->l_linkmode; 1461 else 1462 return IF_LINK_MODE_DEFAULT; 1463} 1464 1465uint64_t rtnl_link_get_stat(struct rtnl_link *link, int id) 1466{ 1467 if (id < 0 || id > RTNL_LINK_STATS_MAX) 1468 return 0; 1469 1470 return link->l_stats[id]; 1471} 1472 1473/** 1474 * Specify the info type of a link 1475 * @arg link link object 1476 * @arg type info type 1477 * 1478 * Looks up the info type and prepares the link to store info type 1479 * specific attributes. If an info type has been assigned already 1480 * it will be released with all changes lost. 1481 * 1482 * @return 0 on success or a negative errror code. 1483 */ 1484int rtnl_link_set_info_type(struct rtnl_link *link, const char *type) 1485{ 1486 struct rtnl_link_info_ops *io; 1487 int err; 1488 1489 if ((io = rtnl_link_info_ops_lookup(type)) == NULL) 1490 return -NLE_OPNOTSUPP; 1491 1492 if (link->l_info_ops) 1493 release_link_info(link); 1494 1495 if ((err = io->io_alloc(link)) < 0) 1496 return err; 1497 1498 link->l_info_ops = io; 1499 1500 return 0; 1501} 1502 1503/** 1504 * Return info type of a link 1505 * @arg link link object 1506 * 1507 * @note The returned pointer is only valid as long as the link exists 1508 * @return Info type name or NULL if unknown. 1509 */ 1510char *rtnl_link_get_info_type(struct rtnl_link *link) 1511{ 1512 if (link->l_info_ops) 1513 return link->l_info_ops->io_name; 1514 else 1515 return NULL; 1516} 1517 1518/** @} */ 1519 1520static struct nl_object_ops link_obj_ops = { 1521 .oo_name = "route/link", 1522 .oo_size = sizeof(struct rtnl_link), 1523 .oo_free_data = link_free_data, 1524 .oo_clone = link_clone, 1525 .oo_dump[NL_DUMP_BRIEF] = link_dump_brief, 1526 .oo_dump[NL_DUMP_FULL] = link_dump_full, 1527 .oo_dump[NL_DUMP_STATS] = link_dump_stats, 1528 .oo_dump[NL_DUMP_XML] = link_dump_xml, 1529 .oo_dump[NL_DUMP_ENV] = link_dump_env, 1530 .oo_compare = link_compare, 1531 .oo_attrs2str = link_attrs2str, 1532 .oo_id_attrs = LINK_ATTR_IFINDEX, 1533}; 1534 1535static struct nl_af_group link_groups[] = { 1536 { AF_UNSPEC, RTNLGRP_LINK }, 1537 { END_OF_GROUP_LIST }, 1538}; 1539 1540static struct nl_cache_ops rtnl_link_ops = { 1541 .co_name = "route/link", 1542 .co_hdrsize = sizeof(struct ifinfomsg), 1543 .co_msgtypes = { 1544 { RTM_NEWLINK, NL_ACT_NEW, "new" }, 1545 { RTM_DELLINK, NL_ACT_DEL, "del" }, 1546 { RTM_GETLINK, NL_ACT_GET, "get" }, 1547 END_OF_MSGTYPES_LIST, 1548 }, 1549 .co_protocol = NETLINK_ROUTE, 1550 .co_groups = link_groups, 1551 .co_request_update = link_request_update, 1552 .co_msg_parser = link_msg_parser, 1553 .co_obj_ops = &link_obj_ops, 1554}; 1555 1556static void __init link_init(void) 1557{ 1558 nl_cache_mngt_register(&rtnl_link_ops); 1559} 1560 1561static void __exit link_exit(void) 1562{ 1563 nl_cache_mngt_unregister(&rtnl_link_ops); 1564} 1565 1566/** @} */ 1567