1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/nsproxy.h> 39 40 #include <asm/uaccess.h> 41 #include <asm/system.h> 42 #include <asm/string.h> 43 44 #include <linux/inet.h> 45 #include <linux/netdevice.h> 46 #include <net/ip.h> 47 #include <net/protocol.h> 48 #include <net/arp.h> 49 #include <net/route.h> 50 #include <net/udp.h> 51 #include <net/sock.h> 52 #include <net/pkt_sched.h> 53 #include <net/fib_rules.h> 54 #include <net/rtnetlink.h> 55 56 struct rtnl_link 57 { 58 rtnl_doit_func doit; 59 rtnl_dumpit_func dumpit; 60 }; 61 62 static DEFINE_MUTEX(rtnl_mutex); 63 64 void rtnl_lock(void) 65 { 66 mutex_lock(&rtnl_mutex); 67 } 68 69 void __rtnl_unlock(void) 70 { 71 mutex_unlock(&rtnl_mutex); 72 } 73 74 void rtnl_unlock(void) 75 { 76 /* This fellow will unlock it for us. */ 77 netdev_run_todo(); 78 } 79 80 int rtnl_trylock(void) 81 { 82 return mutex_trylock(&rtnl_mutex); 83 } 84 85 int rtnl_is_locked(void) 86 { 87 return mutex_is_locked(&rtnl_mutex); 88 } 89 90 static struct rtnl_link *rtnl_msg_handlers[NPROTO]; 91 92 static inline int rtm_msgindex(int msgtype) 93 { 94 int msgindex = msgtype - RTM_BASE; 95 96 /* 97 * msgindex < 0 implies someone tried to register a netlink 98 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 99 * the message type has not been added to linux/rtnetlink.h 100 */ 101 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 102 103 return msgindex; 104 } 105 106 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 107 { 108 struct rtnl_link *tab; 109 110 tab = rtnl_msg_handlers[protocol]; 111 if (tab == NULL || tab[msgindex].doit == NULL) 112 tab = rtnl_msg_handlers[PF_UNSPEC]; 113 114 return tab ? tab[msgindex].doit : NULL; 115 } 116 117 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 118 { 119 struct rtnl_link *tab; 120 121 tab = rtnl_msg_handlers[protocol]; 122 if (tab == NULL || tab[msgindex].dumpit == NULL) 123 tab = rtnl_msg_handlers[PF_UNSPEC]; 124 125 return tab ? tab[msgindex].dumpit : NULL; 126 } 127 128 /** 129 * __rtnl_register - Register a rtnetlink message type 130 * @protocol: Protocol family or PF_UNSPEC 131 * @msgtype: rtnetlink message type 132 * @doit: Function pointer called for each request message 133 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 134 * 135 * Registers the specified function pointers (at least one of them has 136 * to be non-NULL) to be called whenever a request message for the 137 * specified protocol family and message type is received. 138 * 139 * The special protocol family PF_UNSPEC may be used to define fallback 140 * function pointers for the case when no entry for the specific protocol 141 * family exists. 142 * 143 * Returns 0 on success or a negative error code. 144 */ 145 int __rtnl_register(int protocol, int msgtype, 146 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 147 { 148 struct rtnl_link *tab; 149 int msgindex; 150 151 BUG_ON(protocol < 0 || protocol >= NPROTO); 152 msgindex = rtm_msgindex(msgtype); 153 154 tab = rtnl_msg_handlers[protocol]; 155 if (tab == NULL) { 156 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 157 if (tab == NULL) 158 return -ENOBUFS; 159 160 rtnl_msg_handlers[protocol] = tab; 161 } 162 163 if (doit) 164 tab[msgindex].doit = doit; 165 166 if (dumpit) 167 tab[msgindex].dumpit = dumpit; 168 169 return 0; 170 } 171 172 EXPORT_SYMBOL_GPL(__rtnl_register); 173 174 /** 175 * rtnl_register - Register a rtnetlink message type 176 * 177 * Identical to __rtnl_register() but panics on failure. This is useful 178 * as failure of this function is very unlikely, it can only happen due 179 * to lack of memory when allocating the chain to store all message 180 * handlers for a protocol. Meant for use in init functions where lack 181 * of memory implies no sense in continueing. 182 */ 183 void rtnl_register(int protocol, int msgtype, 184 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 185 { 186 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 187 panic("Unable to register rtnetlink message handler, " 188 "protocol = %d, message type = %d\n", 189 protocol, msgtype); 190 } 191 192 EXPORT_SYMBOL_GPL(rtnl_register); 193 194 /** 195 * rtnl_unregister - Unregister a rtnetlink message type 196 * @protocol: Protocol family or PF_UNSPEC 197 * @msgtype: rtnetlink message type 198 * 199 * Returns 0 on success or a negative error code. 200 */ 201 int rtnl_unregister(int protocol, int msgtype) 202 { 203 int msgindex; 204 205 BUG_ON(protocol < 0 || protocol >= NPROTO); 206 msgindex = rtm_msgindex(msgtype); 207 208 if (rtnl_msg_handlers[protocol] == NULL) 209 return -ENOENT; 210 211 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 212 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 213 214 return 0; 215 } 216 217 EXPORT_SYMBOL_GPL(rtnl_unregister); 218 219 /** 220 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 221 * @protocol : Protocol family or PF_UNSPEC 222 * 223 * Identical to calling rtnl_unregster() for all registered message types 224 * of a certain protocol family. 225 */ 226 void rtnl_unregister_all(int protocol) 227 { 228 BUG_ON(protocol < 0 || protocol >= NPROTO); 229 230 kfree(rtnl_msg_handlers[protocol]); 231 rtnl_msg_handlers[protocol] = NULL; 232 } 233 234 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 235 236 static LIST_HEAD(link_ops); 237 238 /** 239 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 240 * @ops: struct rtnl_link_ops * to register 241 * 242 * The caller must hold the rtnl_mutex. This function should be used 243 * by drivers that create devices during module initialization. It 244 * must be called before registering the devices. 245 * 246 * Returns 0 on success or a negative error code. 247 */ 248 int __rtnl_link_register(struct rtnl_link_ops *ops) 249 { 250 if (!ops->dellink) 251 ops->dellink = unregister_netdevice; 252 253 list_add_tail(&ops->list, &link_ops); 254 return 0; 255 } 256 257 EXPORT_SYMBOL_GPL(__rtnl_link_register); 258 259 /** 260 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 261 * @ops: struct rtnl_link_ops * to register 262 * 263 * Returns 0 on success or a negative error code. 264 */ 265 int rtnl_link_register(struct rtnl_link_ops *ops) 266 { 267 int err; 268 269 rtnl_lock(); 270 err = __rtnl_link_register(ops); 271 rtnl_unlock(); 272 return err; 273 } 274 275 EXPORT_SYMBOL_GPL(rtnl_link_register); 276 277 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 278 { 279 struct net_device *dev; 280 restart: 281 for_each_netdev(net, dev) { 282 if (dev->rtnl_link_ops == ops) { 283 ops->dellink(dev); 284 goto restart; 285 } 286 } 287 } 288 289 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 290 { 291 rtnl_lock(); 292 __rtnl_kill_links(net, ops); 293 rtnl_unlock(); 294 } 295 EXPORT_SYMBOL_GPL(rtnl_kill_links); 296 297 /** 298 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 299 * @ops: struct rtnl_link_ops * to unregister 300 * 301 * The caller must hold the rtnl_mutex. 302 */ 303 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 304 { 305 struct net *net; 306 307 for_each_net(net) { 308 __rtnl_kill_links(net, ops); 309 } 310 list_del(&ops->list); 311 } 312 313 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 314 315 /** 316 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 317 * @ops: struct rtnl_link_ops * to unregister 318 */ 319 void rtnl_link_unregister(struct rtnl_link_ops *ops) 320 { 321 rtnl_lock(); 322 __rtnl_link_unregister(ops); 323 rtnl_unlock(); 324 } 325 326 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 327 328 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 329 { 330 const struct rtnl_link_ops *ops; 331 332 list_for_each_entry(ops, &link_ops, list) { 333 if (!strcmp(ops->kind, kind)) 334 return ops; 335 } 336 return NULL; 337 } 338 339 static size_t rtnl_link_get_size(const struct net_device *dev) 340 { 341 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 342 size_t size; 343 344 if (!ops) 345 return 0; 346 347 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 348 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 349 350 if (ops->get_size) 351 /* IFLA_INFO_DATA + nested data */ 352 size += nlmsg_total_size(sizeof(struct nlattr)) + 353 ops->get_size(dev); 354 355 if (ops->get_xstats_size) 356 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ 357 358 return size; 359 } 360 361 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 362 { 363 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 364 struct nlattr *linkinfo, *data; 365 int err = -EMSGSIZE; 366 367 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 368 if (linkinfo == NULL) 369 goto out; 370 371 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 372 goto err_cancel_link; 373 if (ops->fill_xstats) { 374 err = ops->fill_xstats(skb, dev); 375 if (err < 0) 376 goto err_cancel_link; 377 } 378 if (ops->fill_info) { 379 data = nla_nest_start(skb, IFLA_INFO_DATA); 380 if (data == NULL) 381 goto err_cancel_link; 382 err = ops->fill_info(skb, dev); 383 if (err < 0) 384 goto err_cancel_data; 385 nla_nest_end(skb, data); 386 } 387 388 nla_nest_end(skb, linkinfo); 389 return 0; 390 391 err_cancel_data: 392 nla_nest_cancel(skb, data); 393 err_cancel_link: 394 nla_nest_cancel(skb, linkinfo); 395 out: 396 return err; 397 } 398 399 static const int rtm_min[RTM_NR_FAMILIES] = 400 { 401 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 402 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 403 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 404 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 405 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 406 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 407 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 408 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 409 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 410 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 411 }; 412 413 static const int rta_max[RTM_NR_FAMILIES] = 414 { 415 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 416 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 417 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 418 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 419 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 420 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 421 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 422 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 423 }; 424 425 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 426 { 427 struct rtattr *rta; 428 int size = RTA_LENGTH(attrlen); 429 430 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); 431 rta->rta_type = attrtype; 432 rta->rta_len = size; 433 memcpy(RTA_DATA(rta), data, attrlen); 434 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 435 } 436 437 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 438 { 439 struct sock *rtnl = net->rtnl; 440 int err = 0; 441 442 NETLINK_CB(skb).dst_group = group; 443 if (echo) 444 atomic_inc(&skb->users); 445 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 446 if (echo) 447 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 448 return err; 449 } 450 451 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 452 { 453 struct sock *rtnl = net->rtnl; 454 455 return nlmsg_unicast(rtnl, skb, pid); 456 } 457 458 int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 459 struct nlmsghdr *nlh, gfp_t flags) 460 { 461 struct sock *rtnl = net->rtnl; 462 int report = 0; 463 464 if (nlh) 465 report = nlmsg_report(nlh); 466 467 return nlmsg_notify(rtnl, skb, pid, group, report, flags); 468 } 469 470 void rtnl_set_sk_err(struct net *net, u32 group, int error) 471 { 472 struct sock *rtnl = net->rtnl; 473 474 netlink_set_err(rtnl, 0, group, error); 475 } 476 477 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 478 { 479 struct nlattr *mx; 480 int i, valid = 0; 481 482 mx = nla_nest_start(skb, RTA_METRICS); 483 if (mx == NULL) 484 return -ENOBUFS; 485 486 for (i = 0; i < RTAX_MAX; i++) { 487 if (metrics[i]) { 488 valid++; 489 NLA_PUT_U32(skb, i+1, metrics[i]); 490 } 491 } 492 493 if (!valid) { 494 nla_nest_cancel(skb, mx); 495 return 0; 496 } 497 498 return nla_nest_end(skb, mx); 499 500 nla_put_failure: 501 nla_nest_cancel(skb, mx); 502 return -EMSGSIZE; 503 } 504 505 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 506 u32 ts, u32 tsage, long expires, u32 error) 507 { 508 struct rta_cacheinfo ci = { 509 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 510 .rta_used = dst->__use, 511 .rta_clntref = atomic_read(&(dst->__refcnt)), 512 .rta_error = error, 513 .rta_id = id, 514 .rta_ts = ts, 515 .rta_tsage = tsage, 516 }; 517 518 if (expires) 519 ci.rta_expires = jiffies_to_clock_t(expires); 520 521 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 522 } 523 524 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 525 526 static void set_operstate(struct net_device *dev, unsigned char transition) 527 { 528 unsigned char operstate = dev->operstate; 529 530 switch(transition) { 531 case IF_OPER_UP: 532 if ((operstate == IF_OPER_DORMANT || 533 operstate == IF_OPER_UNKNOWN) && 534 !netif_dormant(dev)) 535 operstate = IF_OPER_UP; 536 break; 537 538 case IF_OPER_DORMANT: 539 if (operstate == IF_OPER_UP || 540 operstate == IF_OPER_UNKNOWN) 541 operstate = IF_OPER_DORMANT; 542 break; 543 } 544 545 if (dev->operstate != operstate) { 546 write_lock_bh(&dev_base_lock); 547 dev->operstate = operstate; 548 write_unlock_bh(&dev_base_lock); 549 netdev_state_change(dev); 550 } 551 } 552 553 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 554 struct net_device_stats *b) 555 { 556 a->rx_packets = b->rx_packets; 557 a->tx_packets = b->tx_packets; 558 a->rx_bytes = b->rx_bytes; 559 a->tx_bytes = b->tx_bytes; 560 a->rx_errors = b->rx_errors; 561 a->tx_errors = b->tx_errors; 562 a->rx_dropped = b->rx_dropped; 563 a->tx_dropped = b->tx_dropped; 564 565 a->multicast = b->multicast; 566 a->collisions = b->collisions; 567 568 a->rx_length_errors = b->rx_length_errors; 569 a->rx_over_errors = b->rx_over_errors; 570 a->rx_crc_errors = b->rx_crc_errors; 571 a->rx_frame_errors = b->rx_frame_errors; 572 a->rx_fifo_errors = b->rx_fifo_errors; 573 a->rx_missed_errors = b->rx_missed_errors; 574 575 a->tx_aborted_errors = b->tx_aborted_errors; 576 a->tx_carrier_errors = b->tx_carrier_errors; 577 a->tx_fifo_errors = b->tx_fifo_errors; 578 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 579 a->tx_window_errors = b->tx_window_errors; 580 581 a->rx_compressed = b->rx_compressed; 582 a->tx_compressed = b->tx_compressed; 583 }; 584 585 static inline size_t if_nlmsg_size(const struct net_device *dev) 586 { 587 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 588 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 589 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 590 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 591 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 592 + nla_total_size(sizeof(struct rtnl_link_stats)) 593 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 594 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 595 + nla_total_size(4) /* IFLA_TXQLEN */ 596 + nla_total_size(4) /* IFLA_WEIGHT */ 597 + nla_total_size(4) /* IFLA_MTU */ 598 + nla_total_size(4) /* IFLA_LINK */ 599 + nla_total_size(4) /* IFLA_MASTER */ 600 + nla_total_size(1) /* IFLA_OPERSTATE */ 601 + nla_total_size(1) /* IFLA_LINKMODE */ 602 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 603 } 604 605 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 606 int type, u32 pid, u32 seq, u32 change, 607 unsigned int flags) 608 { 609 struct netdev_queue *txq; 610 struct ifinfomsg *ifm; 611 struct nlmsghdr *nlh; 612 struct net_device_stats *stats; 613 struct nlattr *attr; 614 615 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 616 if (nlh == NULL) 617 return -EMSGSIZE; 618 619 ifm = nlmsg_data(nlh); 620 ifm->ifi_family = AF_UNSPEC; 621 ifm->__ifi_pad = 0; 622 ifm->ifi_type = dev->type; 623 ifm->ifi_index = dev->ifindex; 624 ifm->ifi_flags = dev_get_flags(dev); 625 ifm->ifi_change = change; 626 627 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 628 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 629 NLA_PUT_U8(skb, IFLA_OPERSTATE, 630 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 631 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 632 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 633 634 if (dev->ifindex != dev->iflink) 635 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 636 637 if (dev->master) 638 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 639 640 txq = netdev_get_tx_queue(dev, 0); 641 if (txq->qdisc_sleeping) 642 NLA_PUT_STRING(skb, IFLA_QDISC, txq->qdisc_sleeping->ops->id); 643 644 if (dev->ifalias) 645 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 646 647 if (1) { 648 struct rtnl_link_ifmap map = { 649 .mem_start = dev->mem_start, 650 .mem_end = dev->mem_end, 651 .base_addr = dev->base_addr, 652 .irq = dev->irq, 653 .dma = dev->dma, 654 .port = dev->if_port, 655 }; 656 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 657 } 658 659 if (dev->addr_len) { 660 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 661 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 662 } 663 664 attr = nla_reserve(skb, IFLA_STATS, 665 sizeof(struct rtnl_link_stats)); 666 if (attr == NULL) 667 goto nla_put_failure; 668 669 stats = dev->get_stats(dev); 670 copy_rtnl_link_stats(nla_data(attr), stats); 671 672 if (dev->rtnl_link_ops) { 673 if (rtnl_link_fill(skb, dev) < 0) 674 goto nla_put_failure; 675 } 676 677 return nlmsg_end(skb, nlh); 678 679 nla_put_failure: 680 nlmsg_cancel(skb, nlh); 681 return -EMSGSIZE; 682 } 683 684 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 685 { 686 struct net *net = sock_net(skb->sk); 687 int idx; 688 int s_idx = cb->args[0]; 689 struct net_device *dev; 690 691 idx = 0; 692 for_each_netdev(net, dev) { 693 if (idx < s_idx) 694 goto cont; 695 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 696 NETLINK_CB(cb->skb).pid, 697 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) 698 break; 699 cont: 700 idx++; 701 } 702 cb->args[0] = idx; 703 704 return skb->len; 705 } 706 707 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 708 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 709 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 710 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 711 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 712 [IFLA_MTU] = { .type = NLA_U32 }, 713 [IFLA_LINK] = { .type = NLA_U32 }, 714 [IFLA_TXQLEN] = { .type = NLA_U32 }, 715 [IFLA_WEIGHT] = { .type = NLA_U32 }, 716 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 717 [IFLA_LINKMODE] = { .type = NLA_U8 }, 718 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 719 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 720 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 721 }; 722 723 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 724 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 725 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 726 }; 727 728 static struct net *get_net_ns_by_pid(pid_t pid) 729 { 730 struct task_struct *tsk; 731 struct net *net; 732 733 /* Lookup the network namespace */ 734 net = ERR_PTR(-ESRCH); 735 rcu_read_lock(); 736 tsk = find_task_by_vpid(pid); 737 if (tsk) { 738 struct nsproxy *nsproxy; 739 nsproxy = task_nsproxy(tsk); 740 if (nsproxy) 741 net = get_net(nsproxy->net_ns); 742 } 743 rcu_read_unlock(); 744 return net; 745 } 746 747 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 748 { 749 if (dev) { 750 if (tb[IFLA_ADDRESS] && 751 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 752 return -EINVAL; 753 754 if (tb[IFLA_BROADCAST] && 755 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 756 return -EINVAL; 757 } 758 759 return 0; 760 } 761 762 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 763 struct nlattr **tb, char *ifname, int modified) 764 { 765 int send_addr_notify = 0; 766 int err; 767 768 if (tb[IFLA_NET_NS_PID]) { 769 struct net *net; 770 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 771 if (IS_ERR(net)) { 772 err = PTR_ERR(net); 773 goto errout; 774 } 775 err = dev_change_net_namespace(dev, net, ifname); 776 put_net(net); 777 if (err) 778 goto errout; 779 modified = 1; 780 } 781 782 if (tb[IFLA_MAP]) { 783 struct rtnl_link_ifmap *u_map; 784 struct ifmap k_map; 785 786 if (!dev->set_config) { 787 err = -EOPNOTSUPP; 788 goto errout; 789 } 790 791 if (!netif_device_present(dev)) { 792 err = -ENODEV; 793 goto errout; 794 } 795 796 u_map = nla_data(tb[IFLA_MAP]); 797 k_map.mem_start = (unsigned long) u_map->mem_start; 798 k_map.mem_end = (unsigned long) u_map->mem_end; 799 k_map.base_addr = (unsigned short) u_map->base_addr; 800 k_map.irq = (unsigned char) u_map->irq; 801 k_map.dma = (unsigned char) u_map->dma; 802 k_map.port = (unsigned char) u_map->port; 803 804 err = dev->set_config(dev, &k_map); 805 if (err < 0) 806 goto errout; 807 808 modified = 1; 809 } 810 811 if (tb[IFLA_ADDRESS]) { 812 struct sockaddr *sa; 813 int len; 814 815 if (!dev->set_mac_address) { 816 err = -EOPNOTSUPP; 817 goto errout; 818 } 819 820 if (!netif_device_present(dev)) { 821 err = -ENODEV; 822 goto errout; 823 } 824 825 len = sizeof(sa_family_t) + dev->addr_len; 826 sa = kmalloc(len, GFP_KERNEL); 827 if (!sa) { 828 err = -ENOMEM; 829 goto errout; 830 } 831 sa->sa_family = dev->type; 832 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 833 dev->addr_len); 834 err = dev->set_mac_address(dev, sa); 835 kfree(sa); 836 if (err) 837 goto errout; 838 send_addr_notify = 1; 839 modified = 1; 840 } 841 842 if (tb[IFLA_MTU]) { 843 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 844 if (err < 0) 845 goto errout; 846 modified = 1; 847 } 848 849 /* 850 * Interface selected by interface index but interface 851 * name provided implies that a name change has been 852 * requested. 853 */ 854 if (ifm->ifi_index > 0 && ifname[0]) { 855 err = dev_change_name(dev, ifname); 856 if (err < 0) 857 goto errout; 858 modified = 1; 859 } 860 861 if (tb[IFLA_IFALIAS]) { 862 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 863 nla_len(tb[IFLA_IFALIAS])); 864 if (err < 0) 865 goto errout; 866 modified = 1; 867 } 868 869 if (tb[IFLA_BROADCAST]) { 870 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 871 send_addr_notify = 1; 872 } 873 874 if (ifm->ifi_flags || ifm->ifi_change) { 875 unsigned int flags = ifm->ifi_flags; 876 877 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 878 if (ifm->ifi_change) 879 flags = (flags & ifm->ifi_change) | 880 (dev->flags & ~ifm->ifi_change); 881 err = dev_change_flags(dev, flags); 882 if (err < 0) 883 goto errout; 884 } 885 886 if (tb[IFLA_TXQLEN]) 887 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 888 889 if (tb[IFLA_OPERSTATE]) 890 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 891 892 if (tb[IFLA_LINKMODE]) { 893 write_lock_bh(&dev_base_lock); 894 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 895 write_unlock_bh(&dev_base_lock); 896 } 897 898 err = 0; 899 900 errout: 901 if (err < 0 && modified && net_ratelimit()) 902 printk(KERN_WARNING "A link change request failed with " 903 "some changes comitted already. Interface %s may " 904 "have been left with an inconsistent configuration, " 905 "please check.\n", dev->name); 906 907 if (send_addr_notify) 908 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 909 return err; 910 } 911 912 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 913 { 914 struct net *net = sock_net(skb->sk); 915 struct ifinfomsg *ifm; 916 struct net_device *dev; 917 int err; 918 struct nlattr *tb[IFLA_MAX+1]; 919 char ifname[IFNAMSIZ]; 920 921 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 922 if (err < 0) 923 goto errout; 924 925 if (tb[IFLA_IFNAME]) 926 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 927 else 928 ifname[0] = '\0'; 929 930 err = -EINVAL; 931 ifm = nlmsg_data(nlh); 932 if (ifm->ifi_index > 0) 933 dev = dev_get_by_index(net, ifm->ifi_index); 934 else if (tb[IFLA_IFNAME]) 935 dev = dev_get_by_name(net, ifname); 936 else 937 goto errout; 938 939 if (dev == NULL) { 940 err = -ENODEV; 941 goto errout; 942 } 943 944 if ((err = validate_linkmsg(dev, tb)) < 0) 945 goto errout_dev; 946 947 err = do_setlink(dev, ifm, tb, ifname, 0); 948 errout_dev: 949 dev_put(dev); 950 errout: 951 return err; 952 } 953 954 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 955 { 956 struct net *net = sock_net(skb->sk); 957 const struct rtnl_link_ops *ops; 958 struct net_device *dev; 959 struct ifinfomsg *ifm; 960 char ifname[IFNAMSIZ]; 961 struct nlattr *tb[IFLA_MAX+1]; 962 int err; 963 964 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 965 if (err < 0) 966 return err; 967 968 if (tb[IFLA_IFNAME]) 969 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 970 971 ifm = nlmsg_data(nlh); 972 if (ifm->ifi_index > 0) 973 dev = __dev_get_by_index(net, ifm->ifi_index); 974 else if (tb[IFLA_IFNAME]) 975 dev = __dev_get_by_name(net, ifname); 976 else 977 return -EINVAL; 978 979 if (!dev) 980 return -ENODEV; 981 982 ops = dev->rtnl_link_ops; 983 if (!ops) 984 return -EOPNOTSUPP; 985 986 ops->dellink(dev); 987 return 0; 988 } 989 990 struct net_device *rtnl_create_link(struct net *net, char *ifname, 991 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 992 { 993 int err; 994 struct net_device *dev; 995 996 err = -ENOMEM; 997 dev = alloc_netdev(ops->priv_size, ifname, ops->setup); 998 if (!dev) 999 goto err; 1000 1001 if (strchr(dev->name, '%')) { 1002 err = dev_alloc_name(dev, dev->name); 1003 if (err < 0) 1004 goto err_free; 1005 } 1006 1007 dev_net_set(dev, net); 1008 dev->rtnl_link_ops = ops; 1009 1010 if (tb[IFLA_MTU]) 1011 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1012 if (tb[IFLA_ADDRESS]) 1013 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1014 nla_len(tb[IFLA_ADDRESS])); 1015 if (tb[IFLA_BROADCAST]) 1016 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1017 nla_len(tb[IFLA_BROADCAST])); 1018 if (tb[IFLA_TXQLEN]) 1019 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1020 if (tb[IFLA_OPERSTATE]) 1021 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1022 if (tb[IFLA_LINKMODE]) 1023 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1024 1025 return dev; 1026 1027 err_free: 1028 free_netdev(dev); 1029 err: 1030 return ERR_PTR(err); 1031 } 1032 1033 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1034 { 1035 struct net *net = sock_net(skb->sk); 1036 const struct rtnl_link_ops *ops; 1037 struct net_device *dev; 1038 struct ifinfomsg *ifm; 1039 char kind[MODULE_NAME_LEN]; 1040 char ifname[IFNAMSIZ]; 1041 struct nlattr *tb[IFLA_MAX+1]; 1042 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1043 int err; 1044 1045 #ifdef CONFIG_MODULES 1046 replay: 1047 #endif 1048 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1049 if (err < 0) 1050 return err; 1051 1052 if (tb[IFLA_IFNAME]) 1053 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1054 else 1055 ifname[0] = '\0'; 1056 1057 ifm = nlmsg_data(nlh); 1058 if (ifm->ifi_index > 0) 1059 dev = __dev_get_by_index(net, ifm->ifi_index); 1060 else if (ifname[0]) 1061 dev = __dev_get_by_name(net, ifname); 1062 else 1063 dev = NULL; 1064 1065 if ((err = validate_linkmsg(dev, tb)) < 0) 1066 return err; 1067 1068 if (tb[IFLA_LINKINFO]) { 1069 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1070 tb[IFLA_LINKINFO], ifla_info_policy); 1071 if (err < 0) 1072 return err; 1073 } else 1074 memset(linkinfo, 0, sizeof(linkinfo)); 1075 1076 if (linkinfo[IFLA_INFO_KIND]) { 1077 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1078 ops = rtnl_link_ops_get(kind); 1079 } else { 1080 kind[0] = '\0'; 1081 ops = NULL; 1082 } 1083 1084 if (1) { 1085 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1086 1087 if (ops) { 1088 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1089 err = nla_parse_nested(attr, ops->maxtype, 1090 linkinfo[IFLA_INFO_DATA], 1091 ops->policy); 1092 if (err < 0) 1093 return err; 1094 data = attr; 1095 } 1096 if (ops->validate) { 1097 err = ops->validate(tb, data); 1098 if (err < 0) 1099 return err; 1100 } 1101 } 1102 1103 if (dev) { 1104 int modified = 0; 1105 1106 if (nlh->nlmsg_flags & NLM_F_EXCL) 1107 return -EEXIST; 1108 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1109 return -EOPNOTSUPP; 1110 1111 if (linkinfo[IFLA_INFO_DATA]) { 1112 if (!ops || ops != dev->rtnl_link_ops || 1113 !ops->changelink) 1114 return -EOPNOTSUPP; 1115 1116 err = ops->changelink(dev, tb, data); 1117 if (err < 0) 1118 return err; 1119 modified = 1; 1120 } 1121 1122 return do_setlink(dev, ifm, tb, ifname, modified); 1123 } 1124 1125 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1126 return -ENODEV; 1127 1128 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) 1129 return -EOPNOTSUPP; 1130 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1131 return -EOPNOTSUPP; 1132 1133 if (!ops) { 1134 #ifdef CONFIG_MODULES 1135 if (kind[0]) { 1136 __rtnl_unlock(); 1137 request_module("rtnl-link-%s", kind); 1138 rtnl_lock(); 1139 ops = rtnl_link_ops_get(kind); 1140 if (ops) 1141 goto replay; 1142 } 1143 #endif 1144 return -EOPNOTSUPP; 1145 } 1146 1147 if (!ifname[0]) 1148 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1149 1150 dev = rtnl_create_link(net, ifname, ops, tb); 1151 1152 if (IS_ERR(dev)) 1153 err = PTR_ERR(dev); 1154 else if (ops->newlink) 1155 err = ops->newlink(dev, tb, data); 1156 else 1157 err = register_netdevice(dev); 1158 1159 if (err < 0 && !IS_ERR(dev)) 1160 free_netdev(dev); 1161 return err; 1162 } 1163 } 1164 1165 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1166 { 1167 struct net *net = sock_net(skb->sk); 1168 struct ifinfomsg *ifm; 1169 struct nlattr *tb[IFLA_MAX+1]; 1170 struct net_device *dev = NULL; 1171 struct sk_buff *nskb; 1172 int err; 1173 1174 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1175 if (err < 0) 1176 return err; 1177 1178 ifm = nlmsg_data(nlh); 1179 if (ifm->ifi_index > 0) { 1180 dev = dev_get_by_index(net, ifm->ifi_index); 1181 if (dev == NULL) 1182 return -ENODEV; 1183 } else 1184 return -EINVAL; 1185 1186 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1187 if (nskb == NULL) { 1188 err = -ENOBUFS; 1189 goto errout; 1190 } 1191 1192 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1193 nlh->nlmsg_seq, 0, 0); 1194 if (err < 0) { 1195 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1196 WARN_ON(err == -EMSGSIZE); 1197 kfree_skb(nskb); 1198 goto errout; 1199 } 1200 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1201 errout: 1202 dev_put(dev); 1203 1204 return err; 1205 } 1206 1207 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1208 { 1209 int idx; 1210 int s_idx = cb->family; 1211 1212 if (s_idx == 0) 1213 s_idx = 1; 1214 for (idx=1; idx<NPROTO; idx++) { 1215 int type = cb->nlh->nlmsg_type-RTM_BASE; 1216 if (idx < s_idx || idx == PF_PACKET) 1217 continue; 1218 if (rtnl_msg_handlers[idx] == NULL || 1219 rtnl_msg_handlers[idx][type].dumpit == NULL) 1220 continue; 1221 if (idx > s_idx) 1222 memset(&cb->args[0], 0, sizeof(cb->args)); 1223 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1224 break; 1225 } 1226 cb->family = idx; 1227 1228 return skb->len; 1229 } 1230 1231 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1232 { 1233 struct net *net = dev_net(dev); 1234 struct sk_buff *skb; 1235 int err = -ENOBUFS; 1236 1237 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1238 if (skb == NULL) 1239 goto errout; 1240 1241 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1242 if (err < 0) { 1243 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1244 WARN_ON(err == -EMSGSIZE); 1245 kfree_skb(skb); 1246 goto errout; 1247 } 1248 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1249 errout: 1250 if (err < 0) 1251 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1252 } 1253 1254 /* Protected by RTNL sempahore. */ 1255 static struct rtattr **rta_buf; 1256 static int rtattr_max; 1257 1258 /* Process one rtnetlink message. */ 1259 1260 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1261 { 1262 struct net *net = sock_net(skb->sk); 1263 rtnl_doit_func doit; 1264 int sz_idx, kind; 1265 int min_len; 1266 int family; 1267 int type; 1268 int err; 1269 1270 type = nlh->nlmsg_type; 1271 if (type > RTM_MAX) 1272 return -EOPNOTSUPP; 1273 1274 type -= RTM_BASE; 1275 1276 /* All the messages must have at least 1 byte length */ 1277 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1278 return 0; 1279 1280 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; 1281 if (family >= NPROTO) 1282 return -EAFNOSUPPORT; 1283 1284 sz_idx = type>>2; 1285 kind = type&3; 1286 1287 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1288 return -EPERM; 1289 1290 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1291 struct sock *rtnl; 1292 rtnl_dumpit_func dumpit; 1293 1294 dumpit = rtnl_get_dumpit(family, type); 1295 if (dumpit == NULL) 1296 return -EOPNOTSUPP; 1297 1298 __rtnl_unlock(); 1299 rtnl = net->rtnl; 1300 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1301 rtnl_lock(); 1302 return err; 1303 } 1304 1305 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1306 1307 min_len = rtm_min[sz_idx]; 1308 if (nlh->nlmsg_len < min_len) 1309 return -EINVAL; 1310 1311 if (nlh->nlmsg_len > min_len) { 1312 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1313 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); 1314 1315 while (RTA_OK(attr, attrlen)) { 1316 unsigned flavor = attr->rta_type; 1317 if (flavor) { 1318 if (flavor > rta_max[sz_idx]) 1319 return -EINVAL; 1320 rta_buf[flavor-1] = attr; 1321 } 1322 attr = RTA_NEXT(attr, attrlen); 1323 } 1324 } 1325 1326 doit = rtnl_get_doit(family, type); 1327 if (doit == NULL) 1328 return -EOPNOTSUPP; 1329 1330 return doit(skb, nlh, (void *)&rta_buf[0]); 1331 } 1332 1333 static void rtnetlink_rcv(struct sk_buff *skb) 1334 { 1335 rtnl_lock(); 1336 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1337 rtnl_unlock(); 1338 } 1339 1340 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1341 { 1342 struct net_device *dev = ptr; 1343 1344 switch (event) { 1345 case NETDEV_UNREGISTER: 1346 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 1347 break; 1348 case NETDEV_REGISTER: 1349 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1350 break; 1351 case NETDEV_UP: 1352 case NETDEV_DOWN: 1353 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 1354 break; 1355 case NETDEV_CHANGE: 1356 case NETDEV_GOING_DOWN: 1357 break; 1358 default: 1359 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1360 break; 1361 } 1362 return NOTIFY_DONE; 1363 } 1364 1365 static struct notifier_block rtnetlink_dev_notifier = { 1366 .notifier_call = rtnetlink_event, 1367 }; 1368 1369 1370 static int rtnetlink_net_init(struct net *net) 1371 { 1372 struct sock *sk; 1373 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1374 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1375 if (!sk) 1376 return -ENOMEM; 1377 net->rtnl = sk; 1378 return 0; 1379 } 1380 1381 static void rtnetlink_net_exit(struct net *net) 1382 { 1383 netlink_kernel_release(net->rtnl); 1384 net->rtnl = NULL; 1385 } 1386 1387 static struct pernet_operations rtnetlink_net_ops = { 1388 .init = rtnetlink_net_init, 1389 .exit = rtnetlink_net_exit, 1390 }; 1391 1392 void __init rtnetlink_init(void) 1393 { 1394 int i; 1395 1396 rtattr_max = 0; 1397 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1398 if (rta_max[i] > rtattr_max) 1399 rtattr_max = rta_max[i]; 1400 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1401 if (!rta_buf) 1402 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1403 1404 if (register_pernet_subsys(&rtnetlink_net_ops)) 1405 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1406 1407 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1408 register_netdevice_notifier(&rtnetlink_dev_notifier); 1409 1410 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1411 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1412 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1413 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1414 1415 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1416 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1417 } 1418 1419 EXPORT_SYMBOL(__rta_fill); 1420 EXPORT_SYMBOL(rtnetlink_put_metrics); 1421 EXPORT_SYMBOL(rtnl_lock); 1422 EXPORT_SYMBOL(rtnl_trylock); 1423 EXPORT_SYMBOL(rtnl_unlock); 1424 EXPORT_SYMBOL(rtnl_is_locked); 1425 EXPORT_SYMBOL(rtnl_unicast); 1426 EXPORT_SYMBOL(rtnl_notify); 1427 EXPORT_SYMBOL(rtnl_set_sk_err); 1428 EXPORT_SYMBOL(rtnl_create_link); 1429 EXPORT_SYMBOL(ifla_policy); 1430