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/pci.h> 39 40 #include <asm/uaccess.h> 41 #include <asm/system.h> 42 43 #include <linux/inet.h> 44 #include <linux/netdevice.h> 45 #include <net/ip.h> 46 #include <net/protocol.h> 47 #include <net/arp.h> 48 #include <net/route.h> 49 #include <net/udp.h> 50 #include <net/sock.h> 51 #include <net/pkt_sched.h> 52 #include <net/fib_rules.h> 53 #include <net/rtnetlink.h> 54 #include <net/net_namespace.h> 55 56 struct rtnl_link { 57 rtnl_doit_func doit; 58 rtnl_dumpit_func dumpit; 59 }; 60 61 static DEFINE_MUTEX(rtnl_mutex); 62 63 void rtnl_lock(void) 64 { 65 mutex_lock(&rtnl_mutex); 66 } 67 EXPORT_SYMBOL(rtnl_lock); 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 EXPORT_SYMBOL(rtnl_unlock); 80 81 int rtnl_trylock(void) 82 { 83 return mutex_trylock(&rtnl_mutex); 84 } 85 EXPORT_SYMBOL(rtnl_trylock); 86 87 int rtnl_is_locked(void) 88 { 89 return mutex_is_locked(&rtnl_mutex); 90 } 91 EXPORT_SYMBOL(rtnl_is_locked); 92 93 #ifdef CONFIG_PROVE_LOCKING 94 int lockdep_rtnl_is_held(void) 95 { 96 return lockdep_is_held(&rtnl_mutex); 97 } 98 EXPORT_SYMBOL(lockdep_rtnl_is_held); 99 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 100 101 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 102 103 static inline int rtm_msgindex(int msgtype) 104 { 105 int msgindex = msgtype - RTM_BASE; 106 107 /* 108 * msgindex < 0 implies someone tried to register a netlink 109 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 110 * the message type has not been added to linux/rtnetlink.h 111 */ 112 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 113 114 return msgindex; 115 } 116 117 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 118 { 119 struct rtnl_link *tab; 120 121 if (protocol <= RTNL_FAMILY_MAX) 122 tab = rtnl_msg_handlers[protocol]; 123 else 124 tab = NULL; 125 126 if (tab == NULL || tab[msgindex].doit == NULL) 127 tab = rtnl_msg_handlers[PF_UNSPEC]; 128 129 return tab ? tab[msgindex].doit : NULL; 130 } 131 132 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 133 { 134 struct rtnl_link *tab; 135 136 if (protocol <= RTNL_FAMILY_MAX) 137 tab = rtnl_msg_handlers[protocol]; 138 else 139 tab = NULL; 140 141 if (tab == NULL || tab[msgindex].dumpit == NULL) 142 tab = rtnl_msg_handlers[PF_UNSPEC]; 143 144 return tab ? tab[msgindex].dumpit : NULL; 145 } 146 147 /** 148 * __rtnl_register - Register a rtnetlink message type 149 * @protocol: Protocol family or PF_UNSPEC 150 * @msgtype: rtnetlink message type 151 * @doit: Function pointer called for each request message 152 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 153 * 154 * Registers the specified function pointers (at least one of them has 155 * to be non-NULL) to be called whenever a request message for the 156 * specified protocol family and message type is received. 157 * 158 * The special protocol family PF_UNSPEC may be used to define fallback 159 * function pointers for the case when no entry for the specific protocol 160 * family exists. 161 * 162 * Returns 0 on success or a negative error code. 163 */ 164 int __rtnl_register(int protocol, int msgtype, 165 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 166 { 167 struct rtnl_link *tab; 168 int msgindex; 169 170 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 171 msgindex = rtm_msgindex(msgtype); 172 173 tab = rtnl_msg_handlers[protocol]; 174 if (tab == NULL) { 175 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 176 if (tab == NULL) 177 return -ENOBUFS; 178 179 rtnl_msg_handlers[protocol] = tab; 180 } 181 182 if (doit) 183 tab[msgindex].doit = doit; 184 185 if (dumpit) 186 tab[msgindex].dumpit = dumpit; 187 188 return 0; 189 } 190 EXPORT_SYMBOL_GPL(__rtnl_register); 191 192 /** 193 * rtnl_register - Register a rtnetlink message type 194 * 195 * Identical to __rtnl_register() but panics on failure. This is useful 196 * as failure of this function is very unlikely, it can only happen due 197 * to lack of memory when allocating the chain to store all message 198 * handlers for a protocol. Meant for use in init functions where lack 199 * of memory implies no sense in continuing. 200 */ 201 void rtnl_register(int protocol, int msgtype, 202 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 203 { 204 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 205 panic("Unable to register rtnetlink message handler, " 206 "protocol = %d, message type = %d\n", 207 protocol, msgtype); 208 } 209 EXPORT_SYMBOL_GPL(rtnl_register); 210 211 /** 212 * rtnl_unregister - Unregister a rtnetlink message type 213 * @protocol: Protocol family or PF_UNSPEC 214 * @msgtype: rtnetlink message type 215 * 216 * Returns 0 on success or a negative error code. 217 */ 218 int rtnl_unregister(int protocol, int msgtype) 219 { 220 int msgindex; 221 222 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 223 msgindex = rtm_msgindex(msgtype); 224 225 if (rtnl_msg_handlers[protocol] == NULL) 226 return -ENOENT; 227 228 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 229 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 230 231 return 0; 232 } 233 EXPORT_SYMBOL_GPL(rtnl_unregister); 234 235 /** 236 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 237 * @protocol : Protocol family or PF_UNSPEC 238 * 239 * Identical to calling rtnl_unregster() for all registered message types 240 * of a certain protocol family. 241 */ 242 void rtnl_unregister_all(int protocol) 243 { 244 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 245 246 kfree(rtnl_msg_handlers[protocol]); 247 rtnl_msg_handlers[protocol] = NULL; 248 } 249 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 250 251 static LIST_HEAD(link_ops); 252 253 /** 254 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 255 * @ops: struct rtnl_link_ops * to register 256 * 257 * The caller must hold the rtnl_mutex. This function should be used 258 * by drivers that create devices during module initialization. It 259 * must be called before registering the devices. 260 * 261 * Returns 0 on success or a negative error code. 262 */ 263 int __rtnl_link_register(struct rtnl_link_ops *ops) 264 { 265 if (!ops->dellink) 266 ops->dellink = unregister_netdevice_queue; 267 268 list_add_tail(&ops->list, &link_ops); 269 return 0; 270 } 271 EXPORT_SYMBOL_GPL(__rtnl_link_register); 272 273 /** 274 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 275 * @ops: struct rtnl_link_ops * to register 276 * 277 * Returns 0 on success or a negative error code. 278 */ 279 int rtnl_link_register(struct rtnl_link_ops *ops) 280 { 281 int err; 282 283 rtnl_lock(); 284 err = __rtnl_link_register(ops); 285 rtnl_unlock(); 286 return err; 287 } 288 EXPORT_SYMBOL_GPL(rtnl_link_register); 289 290 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 291 { 292 struct net_device *dev; 293 LIST_HEAD(list_kill); 294 295 for_each_netdev(net, dev) { 296 if (dev->rtnl_link_ops == ops) 297 ops->dellink(dev, &list_kill); 298 } 299 unregister_netdevice_many(&list_kill); 300 } 301 302 /** 303 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 304 * @ops: struct rtnl_link_ops * to unregister 305 * 306 * The caller must hold the rtnl_mutex. 307 */ 308 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 309 { 310 struct net *net; 311 312 for_each_net(net) { 313 __rtnl_kill_links(net, ops); 314 } 315 list_del(&ops->list); 316 } 317 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 318 319 /** 320 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 321 * @ops: struct rtnl_link_ops * to unregister 322 */ 323 void rtnl_link_unregister(struct rtnl_link_ops *ops) 324 { 325 rtnl_lock(); 326 __rtnl_link_unregister(ops); 327 rtnl_unlock(); 328 } 329 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 330 331 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 332 { 333 const struct rtnl_link_ops *ops; 334 335 list_for_each_entry(ops, &link_ops, list) { 336 if (!strcmp(ops->kind, kind)) 337 return ops; 338 } 339 return NULL; 340 } 341 342 static size_t rtnl_link_get_size(const struct net_device *dev) 343 { 344 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 345 size_t size; 346 347 if (!ops) 348 return 0; 349 350 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 351 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 352 353 if (ops->get_size) 354 /* IFLA_INFO_DATA + nested data */ 355 size += nla_total_size(sizeof(struct nlattr)) + 356 ops->get_size(dev); 357 358 if (ops->get_xstats_size) 359 /* IFLA_INFO_XSTATS */ 360 size += nla_total_size(ops->get_xstats_size(dev)); 361 362 return size; 363 } 364 365 static LIST_HEAD(rtnl_af_ops); 366 367 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 368 { 369 const struct rtnl_af_ops *ops; 370 371 list_for_each_entry(ops, &rtnl_af_ops, list) { 372 if (ops->family == family) 373 return ops; 374 } 375 376 return NULL; 377 } 378 379 /** 380 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink. 381 * @ops: struct rtnl_af_ops * to register 382 * 383 * The caller must hold the rtnl_mutex. 384 * 385 * Returns 0 on success or a negative error code. 386 */ 387 int __rtnl_af_register(struct rtnl_af_ops *ops) 388 { 389 list_add_tail(&ops->list, &rtnl_af_ops); 390 return 0; 391 } 392 EXPORT_SYMBOL_GPL(__rtnl_af_register); 393 394 /** 395 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 396 * @ops: struct rtnl_af_ops * to register 397 * 398 * Returns 0 on success or a negative error code. 399 */ 400 int rtnl_af_register(struct rtnl_af_ops *ops) 401 { 402 int err; 403 404 rtnl_lock(); 405 err = __rtnl_af_register(ops); 406 rtnl_unlock(); 407 return err; 408 } 409 EXPORT_SYMBOL_GPL(rtnl_af_register); 410 411 /** 412 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 413 * @ops: struct rtnl_af_ops * to unregister 414 * 415 * The caller must hold the rtnl_mutex. 416 */ 417 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 418 { 419 list_del(&ops->list); 420 } 421 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 422 423 /** 424 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 425 * @ops: struct rtnl_af_ops * to unregister 426 */ 427 void rtnl_af_unregister(struct rtnl_af_ops *ops) 428 { 429 rtnl_lock(); 430 __rtnl_af_unregister(ops); 431 rtnl_unlock(); 432 } 433 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 434 435 static size_t rtnl_link_get_af_size(const struct net_device *dev) 436 { 437 struct rtnl_af_ops *af_ops; 438 size_t size; 439 440 /* IFLA_AF_SPEC */ 441 size = nla_total_size(sizeof(struct nlattr)); 442 443 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 444 if (af_ops->get_link_af_size) { 445 /* AF_* + nested data */ 446 size += nla_total_size(sizeof(struct nlattr)) + 447 af_ops->get_link_af_size(dev); 448 } 449 } 450 451 return size; 452 } 453 454 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 455 { 456 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 457 struct nlattr *linkinfo, *data; 458 int err = -EMSGSIZE; 459 460 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 461 if (linkinfo == NULL) 462 goto out; 463 464 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 465 goto err_cancel_link; 466 if (ops->fill_xstats) { 467 err = ops->fill_xstats(skb, dev); 468 if (err < 0) 469 goto err_cancel_link; 470 } 471 if (ops->fill_info) { 472 data = nla_nest_start(skb, IFLA_INFO_DATA); 473 if (data == NULL) 474 goto err_cancel_link; 475 err = ops->fill_info(skb, dev); 476 if (err < 0) 477 goto err_cancel_data; 478 nla_nest_end(skb, data); 479 } 480 481 nla_nest_end(skb, linkinfo); 482 return 0; 483 484 err_cancel_data: 485 nla_nest_cancel(skb, data); 486 err_cancel_link: 487 nla_nest_cancel(skb, linkinfo); 488 out: 489 return err; 490 } 491 492 static const int rtm_min[RTM_NR_FAMILIES] = 493 { 494 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 495 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 496 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 497 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 498 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 499 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 500 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 501 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 502 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 503 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 504 }; 505 506 static const int rta_max[RTM_NR_FAMILIES] = 507 { 508 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 509 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 510 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 511 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 512 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 513 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 514 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 515 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 516 }; 517 518 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 519 { 520 struct rtattr *rta; 521 int size = RTA_LENGTH(attrlen); 522 523 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); 524 rta->rta_type = attrtype; 525 rta->rta_len = size; 526 memcpy(RTA_DATA(rta), data, attrlen); 527 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 528 } 529 EXPORT_SYMBOL(__rta_fill); 530 531 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 532 { 533 struct sock *rtnl = net->rtnl; 534 int err = 0; 535 536 NETLINK_CB(skb).dst_group = group; 537 if (echo) 538 atomic_inc(&skb->users); 539 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 540 if (echo) 541 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 542 return err; 543 } 544 545 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 546 { 547 struct sock *rtnl = net->rtnl; 548 549 return nlmsg_unicast(rtnl, skb, pid); 550 } 551 EXPORT_SYMBOL(rtnl_unicast); 552 553 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 554 struct nlmsghdr *nlh, gfp_t flags) 555 { 556 struct sock *rtnl = net->rtnl; 557 int report = 0; 558 559 if (nlh) 560 report = nlmsg_report(nlh); 561 562 nlmsg_notify(rtnl, skb, pid, group, report, flags); 563 } 564 EXPORT_SYMBOL(rtnl_notify); 565 566 void rtnl_set_sk_err(struct net *net, u32 group, int error) 567 { 568 struct sock *rtnl = net->rtnl; 569 570 netlink_set_err(rtnl, 0, group, error); 571 } 572 EXPORT_SYMBOL(rtnl_set_sk_err); 573 574 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 575 { 576 struct nlattr *mx; 577 int i, valid = 0; 578 579 mx = nla_nest_start(skb, RTA_METRICS); 580 if (mx == NULL) 581 return -ENOBUFS; 582 583 for (i = 0; i < RTAX_MAX; i++) { 584 if (metrics[i]) { 585 valid++; 586 NLA_PUT_U32(skb, i+1, metrics[i]); 587 } 588 } 589 590 if (!valid) { 591 nla_nest_cancel(skb, mx); 592 return 0; 593 } 594 595 return nla_nest_end(skb, mx); 596 597 nla_put_failure: 598 nla_nest_cancel(skb, mx); 599 return -EMSGSIZE; 600 } 601 EXPORT_SYMBOL(rtnetlink_put_metrics); 602 603 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 604 u32 ts, u32 tsage, long expires, u32 error) 605 { 606 struct rta_cacheinfo ci = { 607 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 608 .rta_used = dst->__use, 609 .rta_clntref = atomic_read(&(dst->__refcnt)), 610 .rta_error = error, 611 .rta_id = id, 612 .rta_ts = ts, 613 .rta_tsage = tsage, 614 }; 615 616 if (expires) 617 ci.rta_expires = jiffies_to_clock_t(expires); 618 619 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 620 } 621 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 622 623 static void set_operstate(struct net_device *dev, unsigned char transition) 624 { 625 unsigned char operstate = dev->operstate; 626 627 switch (transition) { 628 case IF_OPER_UP: 629 if ((operstate == IF_OPER_DORMANT || 630 operstate == IF_OPER_UNKNOWN) && 631 !netif_dormant(dev)) 632 operstate = IF_OPER_UP; 633 break; 634 635 case IF_OPER_DORMANT: 636 if (operstate == IF_OPER_UP || 637 operstate == IF_OPER_UNKNOWN) 638 operstate = IF_OPER_DORMANT; 639 break; 640 } 641 642 if (dev->operstate != operstate) { 643 write_lock_bh(&dev_base_lock); 644 dev->operstate = operstate; 645 write_unlock_bh(&dev_base_lock); 646 netdev_state_change(dev); 647 } 648 } 649 650 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 651 const struct ifinfomsg *ifm) 652 { 653 unsigned int flags = ifm->ifi_flags; 654 655 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 656 if (ifm->ifi_change) 657 flags = (flags & ifm->ifi_change) | 658 (dev->flags & ~ifm->ifi_change); 659 660 return flags; 661 } 662 663 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 664 const struct rtnl_link_stats64 *b) 665 { 666 a->rx_packets = b->rx_packets; 667 a->tx_packets = b->tx_packets; 668 a->rx_bytes = b->rx_bytes; 669 a->tx_bytes = b->tx_bytes; 670 a->rx_errors = b->rx_errors; 671 a->tx_errors = b->tx_errors; 672 a->rx_dropped = b->rx_dropped; 673 a->tx_dropped = b->tx_dropped; 674 675 a->multicast = b->multicast; 676 a->collisions = b->collisions; 677 678 a->rx_length_errors = b->rx_length_errors; 679 a->rx_over_errors = b->rx_over_errors; 680 a->rx_crc_errors = b->rx_crc_errors; 681 a->rx_frame_errors = b->rx_frame_errors; 682 a->rx_fifo_errors = b->rx_fifo_errors; 683 a->rx_missed_errors = b->rx_missed_errors; 684 685 a->tx_aborted_errors = b->tx_aborted_errors; 686 a->tx_carrier_errors = b->tx_carrier_errors; 687 a->tx_fifo_errors = b->tx_fifo_errors; 688 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 689 a->tx_window_errors = b->tx_window_errors; 690 691 a->rx_compressed = b->rx_compressed; 692 a->tx_compressed = b->tx_compressed; 693 } 694 695 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 696 { 697 memcpy(v, b, sizeof(*b)); 698 } 699 700 /* All VF info */ 701 static inline int rtnl_vfinfo_size(const struct net_device *dev) 702 { 703 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) { 704 705 int num_vfs = dev_num_vf(dev->dev.parent); 706 size_t size = nla_total_size(sizeof(struct nlattr)); 707 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 708 size += num_vfs * 709 (nla_total_size(sizeof(struct ifla_vf_mac)) + 710 nla_total_size(sizeof(struct ifla_vf_vlan)) + 711 nla_total_size(sizeof(struct ifla_vf_tx_rate))); 712 return size; 713 } else 714 return 0; 715 } 716 717 static size_t rtnl_port_size(const struct net_device *dev) 718 { 719 size_t port_size = nla_total_size(4) /* PORT_VF */ 720 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 721 + nla_total_size(sizeof(struct ifla_port_vsi)) 722 /* PORT_VSI_TYPE */ 723 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 724 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 725 + nla_total_size(1) /* PROT_VDP_REQUEST */ 726 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 727 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 728 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 729 + port_size; 730 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 731 + port_size; 732 733 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 734 return 0; 735 if (dev_num_vf(dev->dev.parent)) 736 return port_self_size + vf_ports_size + 737 vf_port_size * dev_num_vf(dev->dev.parent); 738 else 739 return port_self_size; 740 } 741 742 static noinline size_t if_nlmsg_size(const struct net_device *dev) 743 { 744 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 745 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 746 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 747 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 748 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 749 + nla_total_size(sizeof(struct rtnl_link_stats)) 750 + nla_total_size(sizeof(struct rtnl_link_stats64)) 751 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 752 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 753 + nla_total_size(4) /* IFLA_TXQLEN */ 754 + nla_total_size(4) /* IFLA_WEIGHT */ 755 + nla_total_size(4) /* IFLA_MTU */ 756 + nla_total_size(4) /* IFLA_LINK */ 757 + nla_total_size(4) /* IFLA_MASTER */ 758 + nla_total_size(1) /* IFLA_OPERSTATE */ 759 + nla_total_size(1) /* IFLA_LINKMODE */ 760 + nla_total_size(4) /* IFLA_NUM_VF */ 761 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */ 762 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 763 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 764 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 765 } 766 767 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 768 { 769 struct nlattr *vf_ports; 770 struct nlattr *vf_port; 771 int vf; 772 int err; 773 774 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 775 if (!vf_ports) 776 return -EMSGSIZE; 777 778 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 779 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 780 if (!vf_port) 781 goto nla_put_failure; 782 NLA_PUT_U32(skb, IFLA_PORT_VF, vf); 783 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 784 if (err == -EMSGSIZE) 785 goto nla_put_failure; 786 if (err) { 787 nla_nest_cancel(skb, vf_port); 788 continue; 789 } 790 nla_nest_end(skb, vf_port); 791 } 792 793 nla_nest_end(skb, vf_ports); 794 795 return 0; 796 797 nla_put_failure: 798 nla_nest_cancel(skb, vf_ports); 799 return -EMSGSIZE; 800 } 801 802 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 803 { 804 struct nlattr *port_self; 805 int err; 806 807 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 808 if (!port_self) 809 return -EMSGSIZE; 810 811 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 812 if (err) { 813 nla_nest_cancel(skb, port_self); 814 return (err == -EMSGSIZE) ? err : 0; 815 } 816 817 nla_nest_end(skb, port_self); 818 819 return 0; 820 } 821 822 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 823 { 824 int err; 825 826 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 827 return 0; 828 829 err = rtnl_port_self_fill(skb, dev); 830 if (err) 831 return err; 832 833 if (dev_num_vf(dev->dev.parent)) { 834 err = rtnl_vf_ports_fill(skb, dev); 835 if (err) 836 return err; 837 } 838 839 return 0; 840 } 841 842 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 843 int type, u32 pid, u32 seq, u32 change, 844 unsigned int flags) 845 { 846 struct ifinfomsg *ifm; 847 struct nlmsghdr *nlh; 848 struct rtnl_link_stats64 temp; 849 const struct rtnl_link_stats64 *stats; 850 struct nlattr *attr, *af_spec; 851 struct rtnl_af_ops *af_ops; 852 853 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 854 if (nlh == NULL) 855 return -EMSGSIZE; 856 857 ifm = nlmsg_data(nlh); 858 ifm->ifi_family = AF_UNSPEC; 859 ifm->__ifi_pad = 0; 860 ifm->ifi_type = dev->type; 861 ifm->ifi_index = dev->ifindex; 862 ifm->ifi_flags = dev_get_flags(dev); 863 ifm->ifi_change = change; 864 865 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 866 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 867 NLA_PUT_U8(skb, IFLA_OPERSTATE, 868 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 869 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 870 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 871 NLA_PUT_U32(skb, IFLA_GROUP, dev->group); 872 873 if (dev->ifindex != dev->iflink) 874 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 875 876 if (dev->master) 877 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 878 879 if (dev->qdisc) 880 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 881 882 if (dev->ifalias) 883 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 884 885 if (1) { 886 struct rtnl_link_ifmap map = { 887 .mem_start = dev->mem_start, 888 .mem_end = dev->mem_end, 889 .base_addr = dev->base_addr, 890 .irq = dev->irq, 891 .dma = dev->dma, 892 .port = dev->if_port, 893 }; 894 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 895 } 896 897 if (dev->addr_len) { 898 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 899 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 900 } 901 902 attr = nla_reserve(skb, IFLA_STATS, 903 sizeof(struct rtnl_link_stats)); 904 if (attr == NULL) 905 goto nla_put_failure; 906 907 stats = dev_get_stats(dev, &temp); 908 copy_rtnl_link_stats(nla_data(attr), stats); 909 910 attr = nla_reserve(skb, IFLA_STATS64, 911 sizeof(struct rtnl_link_stats64)); 912 if (attr == NULL) 913 goto nla_put_failure; 914 copy_rtnl_link_stats64(nla_data(attr), stats); 915 916 if (dev->dev.parent) 917 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); 918 919 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) { 920 int i; 921 922 struct nlattr *vfinfo, *vf; 923 int num_vfs = dev_num_vf(dev->dev.parent); 924 925 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 926 if (!vfinfo) 927 goto nla_put_failure; 928 for (i = 0; i < num_vfs; i++) { 929 struct ifla_vf_info ivi; 930 struct ifla_vf_mac vf_mac; 931 struct ifla_vf_vlan vf_vlan; 932 struct ifla_vf_tx_rate vf_tx_rate; 933 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 934 break; 935 vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf; 936 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 937 vf_vlan.vlan = ivi.vlan; 938 vf_vlan.qos = ivi.qos; 939 vf_tx_rate.rate = ivi.tx_rate; 940 vf = nla_nest_start(skb, IFLA_VF_INFO); 941 if (!vf) { 942 nla_nest_cancel(skb, vfinfo); 943 goto nla_put_failure; 944 } 945 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac); 946 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan); 947 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate); 948 nla_nest_end(skb, vf); 949 } 950 nla_nest_end(skb, vfinfo); 951 } 952 953 if (rtnl_port_fill(skb, dev)) 954 goto nla_put_failure; 955 956 if (dev->rtnl_link_ops) { 957 if (rtnl_link_fill(skb, dev) < 0) 958 goto nla_put_failure; 959 } 960 961 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 962 goto nla_put_failure; 963 964 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 965 if (af_ops->fill_link_af) { 966 struct nlattr *af; 967 int err; 968 969 if (!(af = nla_nest_start(skb, af_ops->family))) 970 goto nla_put_failure; 971 972 err = af_ops->fill_link_af(skb, dev); 973 974 /* 975 * Caller may return ENODATA to indicate that there 976 * was no data to be dumped. This is not an error, it 977 * means we should trim the attribute header and 978 * continue. 979 */ 980 if (err == -ENODATA) 981 nla_nest_cancel(skb, af); 982 else if (err < 0) 983 goto nla_put_failure; 984 985 nla_nest_end(skb, af); 986 } 987 } 988 989 nla_nest_end(skb, af_spec); 990 991 return nlmsg_end(skb, nlh); 992 993 nla_put_failure: 994 nlmsg_cancel(skb, nlh); 995 return -EMSGSIZE; 996 } 997 998 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 999 { 1000 struct net *net = sock_net(skb->sk); 1001 int h, s_h; 1002 int idx = 0, s_idx; 1003 struct net_device *dev; 1004 struct hlist_head *head; 1005 struct hlist_node *node; 1006 1007 s_h = cb->args[0]; 1008 s_idx = cb->args[1]; 1009 1010 rcu_read_lock(); 1011 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1012 idx = 0; 1013 head = &net->dev_index_head[h]; 1014 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 1015 if (idx < s_idx) 1016 goto cont; 1017 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1018 NETLINK_CB(cb->skb).pid, 1019 cb->nlh->nlmsg_seq, 0, 1020 NLM_F_MULTI) <= 0) 1021 goto out; 1022 cont: 1023 idx++; 1024 } 1025 } 1026 out: 1027 rcu_read_unlock(); 1028 cb->args[1] = idx; 1029 cb->args[0] = h; 1030 1031 return skb->len; 1032 } 1033 1034 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1035 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1036 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1037 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1038 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1039 [IFLA_MTU] = { .type = NLA_U32 }, 1040 [IFLA_LINK] = { .type = NLA_U32 }, 1041 [IFLA_MASTER] = { .type = NLA_U32 }, 1042 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1043 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1044 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1045 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1046 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1047 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1048 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1049 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1050 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1051 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1052 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1053 }; 1054 EXPORT_SYMBOL(ifla_policy); 1055 1056 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1057 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1058 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1059 }; 1060 1061 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1062 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1063 }; 1064 1065 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1066 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1067 .len = sizeof(struct ifla_vf_mac) }, 1068 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1069 .len = sizeof(struct ifla_vf_vlan) }, 1070 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1071 .len = sizeof(struct ifla_vf_tx_rate) }, 1072 }; 1073 1074 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1075 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1076 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1077 .len = PORT_PROFILE_MAX }, 1078 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1079 .len = sizeof(struct ifla_port_vsi)}, 1080 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1081 .len = PORT_UUID_MAX }, 1082 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1083 .len = PORT_UUID_MAX }, 1084 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1085 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1086 }; 1087 1088 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1089 { 1090 struct net *net; 1091 /* Examine the link attributes and figure out which 1092 * network namespace we are talking about. 1093 */ 1094 if (tb[IFLA_NET_NS_PID]) 1095 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1096 else 1097 net = get_net(src_net); 1098 return net; 1099 } 1100 EXPORT_SYMBOL(rtnl_link_get_net); 1101 1102 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1103 { 1104 if (dev) { 1105 if (tb[IFLA_ADDRESS] && 1106 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1107 return -EINVAL; 1108 1109 if (tb[IFLA_BROADCAST] && 1110 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1111 return -EINVAL; 1112 } 1113 1114 if (tb[IFLA_AF_SPEC]) { 1115 struct nlattr *af; 1116 int rem, err; 1117 1118 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1119 const struct rtnl_af_ops *af_ops; 1120 1121 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1122 return -EAFNOSUPPORT; 1123 1124 if (!af_ops->set_link_af) 1125 return -EOPNOTSUPP; 1126 1127 if (af_ops->validate_link_af) { 1128 err = af_ops->validate_link_af(dev, af); 1129 if (err < 0) 1130 return err; 1131 } 1132 } 1133 } 1134 1135 return 0; 1136 } 1137 1138 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1139 { 1140 int rem, err = -EINVAL; 1141 struct nlattr *vf; 1142 const struct net_device_ops *ops = dev->netdev_ops; 1143 1144 nla_for_each_nested(vf, attr, rem) { 1145 switch (nla_type(vf)) { 1146 case IFLA_VF_MAC: { 1147 struct ifla_vf_mac *ivm; 1148 ivm = nla_data(vf); 1149 err = -EOPNOTSUPP; 1150 if (ops->ndo_set_vf_mac) 1151 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1152 ivm->mac); 1153 break; 1154 } 1155 case IFLA_VF_VLAN: { 1156 struct ifla_vf_vlan *ivv; 1157 ivv = nla_data(vf); 1158 err = -EOPNOTSUPP; 1159 if (ops->ndo_set_vf_vlan) 1160 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1161 ivv->vlan, 1162 ivv->qos); 1163 break; 1164 } 1165 case IFLA_VF_TX_RATE: { 1166 struct ifla_vf_tx_rate *ivt; 1167 ivt = nla_data(vf); 1168 err = -EOPNOTSUPP; 1169 if (ops->ndo_set_vf_tx_rate) 1170 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1171 ivt->rate); 1172 break; 1173 } 1174 default: 1175 err = -EINVAL; 1176 break; 1177 } 1178 if (err) 1179 break; 1180 } 1181 return err; 1182 } 1183 1184 static int do_set_master(struct net_device *dev, int ifindex) 1185 { 1186 struct net_device *master_dev; 1187 const struct net_device_ops *ops; 1188 int err; 1189 1190 if (dev->master) { 1191 if (dev->master->ifindex == ifindex) 1192 return 0; 1193 ops = dev->master->netdev_ops; 1194 if (ops->ndo_del_slave) { 1195 err = ops->ndo_del_slave(dev->master, dev); 1196 if (err) 1197 return err; 1198 } else { 1199 return -EOPNOTSUPP; 1200 } 1201 } 1202 1203 if (ifindex) { 1204 master_dev = __dev_get_by_index(dev_net(dev), ifindex); 1205 if (!master_dev) 1206 return -EINVAL; 1207 ops = master_dev->netdev_ops; 1208 if (ops->ndo_add_slave) { 1209 err = ops->ndo_add_slave(master_dev, dev); 1210 if (err) 1211 return err; 1212 } else { 1213 return -EOPNOTSUPP; 1214 } 1215 } 1216 return 0; 1217 } 1218 1219 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1220 struct nlattr **tb, char *ifname, int modified) 1221 { 1222 const struct net_device_ops *ops = dev->netdev_ops; 1223 int send_addr_notify = 0; 1224 int err; 1225 1226 if (tb[IFLA_NET_NS_PID]) { 1227 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1228 if (IS_ERR(net)) { 1229 err = PTR_ERR(net); 1230 goto errout; 1231 } 1232 err = dev_change_net_namespace(dev, net, ifname); 1233 put_net(net); 1234 if (err) 1235 goto errout; 1236 modified = 1; 1237 } 1238 1239 if (tb[IFLA_MAP]) { 1240 struct rtnl_link_ifmap *u_map; 1241 struct ifmap k_map; 1242 1243 if (!ops->ndo_set_config) { 1244 err = -EOPNOTSUPP; 1245 goto errout; 1246 } 1247 1248 if (!netif_device_present(dev)) { 1249 err = -ENODEV; 1250 goto errout; 1251 } 1252 1253 u_map = nla_data(tb[IFLA_MAP]); 1254 k_map.mem_start = (unsigned long) u_map->mem_start; 1255 k_map.mem_end = (unsigned long) u_map->mem_end; 1256 k_map.base_addr = (unsigned short) u_map->base_addr; 1257 k_map.irq = (unsigned char) u_map->irq; 1258 k_map.dma = (unsigned char) u_map->dma; 1259 k_map.port = (unsigned char) u_map->port; 1260 1261 err = ops->ndo_set_config(dev, &k_map); 1262 if (err < 0) 1263 goto errout; 1264 1265 modified = 1; 1266 } 1267 1268 if (tb[IFLA_ADDRESS]) { 1269 struct sockaddr *sa; 1270 int len; 1271 1272 if (!ops->ndo_set_mac_address) { 1273 err = -EOPNOTSUPP; 1274 goto errout; 1275 } 1276 1277 if (!netif_device_present(dev)) { 1278 err = -ENODEV; 1279 goto errout; 1280 } 1281 1282 len = sizeof(sa_family_t) + dev->addr_len; 1283 sa = kmalloc(len, GFP_KERNEL); 1284 if (!sa) { 1285 err = -ENOMEM; 1286 goto errout; 1287 } 1288 sa->sa_family = dev->type; 1289 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1290 dev->addr_len); 1291 err = ops->ndo_set_mac_address(dev, sa); 1292 kfree(sa); 1293 if (err) 1294 goto errout; 1295 send_addr_notify = 1; 1296 modified = 1; 1297 } 1298 1299 if (tb[IFLA_MTU]) { 1300 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1301 if (err < 0) 1302 goto errout; 1303 modified = 1; 1304 } 1305 1306 if (tb[IFLA_GROUP]) { 1307 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1308 modified = 1; 1309 } 1310 1311 /* 1312 * Interface selected by interface index but interface 1313 * name provided implies that a name change has been 1314 * requested. 1315 */ 1316 if (ifm->ifi_index > 0 && ifname[0]) { 1317 err = dev_change_name(dev, ifname); 1318 if (err < 0) 1319 goto errout; 1320 modified = 1; 1321 } 1322 1323 if (tb[IFLA_IFALIAS]) { 1324 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1325 nla_len(tb[IFLA_IFALIAS])); 1326 if (err < 0) 1327 goto errout; 1328 modified = 1; 1329 } 1330 1331 if (tb[IFLA_BROADCAST]) { 1332 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1333 send_addr_notify = 1; 1334 } 1335 1336 if (ifm->ifi_flags || ifm->ifi_change) { 1337 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1338 if (err < 0) 1339 goto errout; 1340 } 1341 1342 if (tb[IFLA_MASTER]) { 1343 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1344 if (err) 1345 goto errout; 1346 modified = 1; 1347 } 1348 1349 if (tb[IFLA_TXQLEN]) 1350 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1351 1352 if (tb[IFLA_OPERSTATE]) 1353 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1354 1355 if (tb[IFLA_LINKMODE]) { 1356 write_lock_bh(&dev_base_lock); 1357 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1358 write_unlock_bh(&dev_base_lock); 1359 } 1360 1361 if (tb[IFLA_VFINFO_LIST]) { 1362 struct nlattr *attr; 1363 int rem; 1364 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1365 if (nla_type(attr) != IFLA_VF_INFO) { 1366 err = -EINVAL; 1367 goto errout; 1368 } 1369 err = do_setvfinfo(dev, attr); 1370 if (err < 0) 1371 goto errout; 1372 modified = 1; 1373 } 1374 } 1375 err = 0; 1376 1377 if (tb[IFLA_VF_PORTS]) { 1378 struct nlattr *port[IFLA_PORT_MAX+1]; 1379 struct nlattr *attr; 1380 int vf; 1381 int rem; 1382 1383 err = -EOPNOTSUPP; 1384 if (!ops->ndo_set_vf_port) 1385 goto errout; 1386 1387 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1388 if (nla_type(attr) != IFLA_VF_PORT) 1389 continue; 1390 err = nla_parse_nested(port, IFLA_PORT_MAX, 1391 attr, ifla_port_policy); 1392 if (err < 0) 1393 goto errout; 1394 if (!port[IFLA_PORT_VF]) { 1395 err = -EOPNOTSUPP; 1396 goto errout; 1397 } 1398 vf = nla_get_u32(port[IFLA_PORT_VF]); 1399 err = ops->ndo_set_vf_port(dev, vf, port); 1400 if (err < 0) 1401 goto errout; 1402 modified = 1; 1403 } 1404 } 1405 err = 0; 1406 1407 if (tb[IFLA_PORT_SELF]) { 1408 struct nlattr *port[IFLA_PORT_MAX+1]; 1409 1410 err = nla_parse_nested(port, IFLA_PORT_MAX, 1411 tb[IFLA_PORT_SELF], ifla_port_policy); 1412 if (err < 0) 1413 goto errout; 1414 1415 err = -EOPNOTSUPP; 1416 if (ops->ndo_set_vf_port) 1417 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1418 if (err < 0) 1419 goto errout; 1420 modified = 1; 1421 } 1422 1423 if (tb[IFLA_AF_SPEC]) { 1424 struct nlattr *af; 1425 int rem; 1426 1427 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1428 const struct rtnl_af_ops *af_ops; 1429 1430 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1431 BUG(); 1432 1433 err = af_ops->set_link_af(dev, af); 1434 if (err < 0) 1435 goto errout; 1436 1437 modified = 1; 1438 } 1439 } 1440 err = 0; 1441 1442 errout: 1443 if (err < 0 && modified && net_ratelimit()) 1444 printk(KERN_WARNING "A link change request failed with " 1445 "some changes committed already. Interface %s may " 1446 "have been left with an inconsistent configuration, " 1447 "please check.\n", dev->name); 1448 1449 if (send_addr_notify) 1450 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1451 return err; 1452 } 1453 1454 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1455 { 1456 struct net *net = sock_net(skb->sk); 1457 struct ifinfomsg *ifm; 1458 struct net_device *dev; 1459 int err; 1460 struct nlattr *tb[IFLA_MAX+1]; 1461 char ifname[IFNAMSIZ]; 1462 1463 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1464 if (err < 0) 1465 goto errout; 1466 1467 if (tb[IFLA_IFNAME]) 1468 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1469 else 1470 ifname[0] = '\0'; 1471 1472 err = -EINVAL; 1473 ifm = nlmsg_data(nlh); 1474 if (ifm->ifi_index > 0) 1475 dev = __dev_get_by_index(net, ifm->ifi_index); 1476 else if (tb[IFLA_IFNAME]) 1477 dev = __dev_get_by_name(net, ifname); 1478 else 1479 goto errout; 1480 1481 if (dev == NULL) { 1482 err = -ENODEV; 1483 goto errout; 1484 } 1485 1486 err = validate_linkmsg(dev, tb); 1487 if (err < 0) 1488 goto errout; 1489 1490 err = do_setlink(dev, ifm, tb, ifname, 0); 1491 errout: 1492 return err; 1493 } 1494 1495 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1496 { 1497 struct net *net = sock_net(skb->sk); 1498 const struct rtnl_link_ops *ops; 1499 struct net_device *dev; 1500 struct ifinfomsg *ifm; 1501 char ifname[IFNAMSIZ]; 1502 struct nlattr *tb[IFLA_MAX+1]; 1503 int err; 1504 LIST_HEAD(list_kill); 1505 1506 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1507 if (err < 0) 1508 return err; 1509 1510 if (tb[IFLA_IFNAME]) 1511 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1512 1513 ifm = nlmsg_data(nlh); 1514 if (ifm->ifi_index > 0) 1515 dev = __dev_get_by_index(net, ifm->ifi_index); 1516 else if (tb[IFLA_IFNAME]) 1517 dev = __dev_get_by_name(net, ifname); 1518 else 1519 return -EINVAL; 1520 1521 if (!dev) 1522 return -ENODEV; 1523 1524 ops = dev->rtnl_link_ops; 1525 if (!ops) 1526 return -EOPNOTSUPP; 1527 1528 ops->dellink(dev, &list_kill); 1529 unregister_netdevice_many(&list_kill); 1530 list_del(&list_kill); 1531 return 0; 1532 } 1533 1534 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1535 { 1536 unsigned int old_flags; 1537 int err; 1538 1539 old_flags = dev->flags; 1540 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1541 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1542 if (err < 0) 1543 return err; 1544 } 1545 1546 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1547 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1548 1549 __dev_notify_flags(dev, old_flags); 1550 return 0; 1551 } 1552 EXPORT_SYMBOL(rtnl_configure_link); 1553 1554 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1555 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1556 { 1557 int err; 1558 struct net_device *dev; 1559 unsigned int num_queues = 1; 1560 unsigned int real_num_queues = 1; 1561 1562 if (ops->get_tx_queues) { 1563 err = ops->get_tx_queues(src_net, tb, &num_queues, 1564 &real_num_queues); 1565 if (err) 1566 goto err; 1567 } 1568 err = -ENOMEM; 1569 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1570 if (!dev) 1571 goto err; 1572 1573 dev_net_set(dev, net); 1574 dev->rtnl_link_ops = ops; 1575 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1576 dev->real_num_tx_queues = real_num_queues; 1577 1578 if (tb[IFLA_MTU]) 1579 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1580 if (tb[IFLA_ADDRESS]) 1581 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1582 nla_len(tb[IFLA_ADDRESS])); 1583 if (tb[IFLA_BROADCAST]) 1584 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1585 nla_len(tb[IFLA_BROADCAST])); 1586 if (tb[IFLA_TXQLEN]) 1587 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1588 if (tb[IFLA_OPERSTATE]) 1589 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1590 if (tb[IFLA_LINKMODE]) 1591 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1592 if (tb[IFLA_GROUP]) 1593 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1594 1595 return dev; 1596 1597 err: 1598 return ERR_PTR(err); 1599 } 1600 EXPORT_SYMBOL(rtnl_create_link); 1601 1602 static int rtnl_group_changelink(struct net *net, int group, 1603 struct ifinfomsg *ifm, 1604 struct nlattr **tb) 1605 { 1606 struct net_device *dev; 1607 int err; 1608 1609 for_each_netdev(net, dev) { 1610 if (dev->group == group) { 1611 err = do_setlink(dev, ifm, tb, NULL, 0); 1612 if (err < 0) 1613 return err; 1614 } 1615 } 1616 1617 return 0; 1618 } 1619 1620 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1621 { 1622 struct net *net = sock_net(skb->sk); 1623 const struct rtnl_link_ops *ops; 1624 struct net_device *dev; 1625 struct ifinfomsg *ifm; 1626 char kind[MODULE_NAME_LEN]; 1627 char ifname[IFNAMSIZ]; 1628 struct nlattr *tb[IFLA_MAX+1]; 1629 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1630 int err; 1631 1632 #ifdef CONFIG_MODULES 1633 replay: 1634 #endif 1635 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1636 if (err < 0) 1637 return err; 1638 1639 if (tb[IFLA_IFNAME]) 1640 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1641 else 1642 ifname[0] = '\0'; 1643 1644 ifm = nlmsg_data(nlh); 1645 if (ifm->ifi_index > 0) 1646 dev = __dev_get_by_index(net, ifm->ifi_index); 1647 else { 1648 if (ifname[0]) 1649 dev = __dev_get_by_name(net, ifname); 1650 else 1651 dev = NULL; 1652 } 1653 1654 err = validate_linkmsg(dev, tb); 1655 if (err < 0) 1656 return err; 1657 1658 if (tb[IFLA_LINKINFO]) { 1659 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1660 tb[IFLA_LINKINFO], ifla_info_policy); 1661 if (err < 0) 1662 return err; 1663 } else 1664 memset(linkinfo, 0, sizeof(linkinfo)); 1665 1666 if (linkinfo[IFLA_INFO_KIND]) { 1667 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1668 ops = rtnl_link_ops_get(kind); 1669 } else { 1670 kind[0] = '\0'; 1671 ops = NULL; 1672 } 1673 1674 if (1) { 1675 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1676 struct net *dest_net; 1677 1678 if (ops) { 1679 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1680 err = nla_parse_nested(attr, ops->maxtype, 1681 linkinfo[IFLA_INFO_DATA], 1682 ops->policy); 1683 if (err < 0) 1684 return err; 1685 data = attr; 1686 } 1687 if (ops->validate) { 1688 err = ops->validate(tb, data); 1689 if (err < 0) 1690 return err; 1691 } 1692 } 1693 1694 if (dev) { 1695 int modified = 0; 1696 1697 if (nlh->nlmsg_flags & NLM_F_EXCL) 1698 return -EEXIST; 1699 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1700 return -EOPNOTSUPP; 1701 1702 if (linkinfo[IFLA_INFO_DATA]) { 1703 if (!ops || ops != dev->rtnl_link_ops || 1704 !ops->changelink) 1705 return -EOPNOTSUPP; 1706 1707 err = ops->changelink(dev, tb, data); 1708 if (err < 0) 1709 return err; 1710 modified = 1; 1711 } 1712 1713 return do_setlink(dev, ifm, tb, ifname, modified); 1714 } 1715 1716 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1717 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1718 return rtnl_group_changelink(net, 1719 nla_get_u32(tb[IFLA_GROUP]), 1720 ifm, tb); 1721 return -ENODEV; 1722 } 1723 1724 if (ifm->ifi_index) 1725 return -EOPNOTSUPP; 1726 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1727 return -EOPNOTSUPP; 1728 1729 if (!ops) { 1730 #ifdef CONFIG_MODULES 1731 if (kind[0]) { 1732 __rtnl_unlock(); 1733 request_module("rtnl-link-%s", kind); 1734 rtnl_lock(); 1735 ops = rtnl_link_ops_get(kind); 1736 if (ops) 1737 goto replay; 1738 } 1739 #endif 1740 return -EOPNOTSUPP; 1741 } 1742 1743 if (!ifname[0]) 1744 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1745 1746 dest_net = rtnl_link_get_net(net, tb); 1747 if (IS_ERR(dest_net)) 1748 return PTR_ERR(dest_net); 1749 1750 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1751 1752 if (IS_ERR(dev)) 1753 err = PTR_ERR(dev); 1754 else if (ops->newlink) 1755 err = ops->newlink(net, dev, tb, data); 1756 else 1757 err = register_netdevice(dev); 1758 1759 if (err < 0 && !IS_ERR(dev)) 1760 free_netdev(dev); 1761 if (err < 0) 1762 goto out; 1763 1764 err = rtnl_configure_link(dev, ifm); 1765 if (err < 0) 1766 unregister_netdevice(dev); 1767 out: 1768 put_net(dest_net); 1769 return err; 1770 } 1771 } 1772 1773 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1774 { 1775 struct net *net = sock_net(skb->sk); 1776 struct ifinfomsg *ifm; 1777 char ifname[IFNAMSIZ]; 1778 struct nlattr *tb[IFLA_MAX+1]; 1779 struct net_device *dev = NULL; 1780 struct sk_buff *nskb; 1781 int err; 1782 1783 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1784 if (err < 0) 1785 return err; 1786 1787 if (tb[IFLA_IFNAME]) 1788 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1789 1790 ifm = nlmsg_data(nlh); 1791 if (ifm->ifi_index > 0) 1792 dev = __dev_get_by_index(net, ifm->ifi_index); 1793 else if (tb[IFLA_IFNAME]) 1794 dev = __dev_get_by_name(net, ifname); 1795 else 1796 return -EINVAL; 1797 1798 if (dev == NULL) 1799 return -ENODEV; 1800 1801 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1802 if (nskb == NULL) 1803 return -ENOBUFS; 1804 1805 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1806 nlh->nlmsg_seq, 0, 0); 1807 if (err < 0) { 1808 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1809 WARN_ON(err == -EMSGSIZE); 1810 kfree_skb(nskb); 1811 } else 1812 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1813 1814 return err; 1815 } 1816 1817 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1818 { 1819 int idx; 1820 int s_idx = cb->family; 1821 1822 if (s_idx == 0) 1823 s_idx = 1; 1824 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1825 int type = cb->nlh->nlmsg_type-RTM_BASE; 1826 if (idx < s_idx || idx == PF_PACKET) 1827 continue; 1828 if (rtnl_msg_handlers[idx] == NULL || 1829 rtnl_msg_handlers[idx][type].dumpit == NULL) 1830 continue; 1831 if (idx > s_idx) 1832 memset(&cb->args[0], 0, sizeof(cb->args)); 1833 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1834 break; 1835 } 1836 cb->family = idx; 1837 1838 return skb->len; 1839 } 1840 1841 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1842 { 1843 struct net *net = dev_net(dev); 1844 struct sk_buff *skb; 1845 int err = -ENOBUFS; 1846 1847 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1848 if (skb == NULL) 1849 goto errout; 1850 1851 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1852 if (err < 0) { 1853 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1854 WARN_ON(err == -EMSGSIZE); 1855 kfree_skb(skb); 1856 goto errout; 1857 } 1858 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1859 return; 1860 errout: 1861 if (err < 0) 1862 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1863 } 1864 1865 /* Protected by RTNL sempahore. */ 1866 static struct rtattr **rta_buf; 1867 static int rtattr_max; 1868 1869 /* Process one rtnetlink message. */ 1870 1871 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1872 { 1873 struct net *net = sock_net(skb->sk); 1874 rtnl_doit_func doit; 1875 int sz_idx, kind; 1876 int min_len; 1877 int family; 1878 int type; 1879 1880 type = nlh->nlmsg_type; 1881 if (type > RTM_MAX) 1882 return -EOPNOTSUPP; 1883 1884 type -= RTM_BASE; 1885 1886 /* All the messages must have at least 1 byte length */ 1887 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1888 return 0; 1889 1890 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1891 sz_idx = type>>2; 1892 kind = type&3; 1893 1894 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1895 return -EPERM; 1896 1897 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1898 struct sock *rtnl; 1899 rtnl_dumpit_func dumpit; 1900 1901 dumpit = rtnl_get_dumpit(family, type); 1902 if (dumpit == NULL) 1903 return -EOPNOTSUPP; 1904 1905 rtnl = net->rtnl; 1906 return netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1907 } 1908 1909 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1910 1911 min_len = rtm_min[sz_idx]; 1912 if (nlh->nlmsg_len < min_len) 1913 return -EINVAL; 1914 1915 if (nlh->nlmsg_len > min_len) { 1916 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1917 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1918 1919 while (RTA_OK(attr, attrlen)) { 1920 unsigned flavor = attr->rta_type; 1921 if (flavor) { 1922 if (flavor > rta_max[sz_idx]) 1923 return -EINVAL; 1924 rta_buf[flavor-1] = attr; 1925 } 1926 attr = RTA_NEXT(attr, attrlen); 1927 } 1928 } 1929 1930 doit = rtnl_get_doit(family, type); 1931 if (doit == NULL) 1932 return -EOPNOTSUPP; 1933 1934 return doit(skb, nlh, (void *)&rta_buf[0]); 1935 } 1936 1937 static void rtnetlink_rcv(struct sk_buff *skb) 1938 { 1939 rtnl_lock(); 1940 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1941 rtnl_unlock(); 1942 } 1943 1944 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1945 { 1946 struct net_device *dev = ptr; 1947 1948 switch (event) { 1949 case NETDEV_UP: 1950 case NETDEV_DOWN: 1951 case NETDEV_PRE_UP: 1952 case NETDEV_POST_INIT: 1953 case NETDEV_REGISTER: 1954 case NETDEV_CHANGE: 1955 case NETDEV_PRE_TYPE_CHANGE: 1956 case NETDEV_GOING_DOWN: 1957 case NETDEV_UNREGISTER: 1958 case NETDEV_UNREGISTER_BATCH: 1959 break; 1960 default: 1961 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1962 break; 1963 } 1964 return NOTIFY_DONE; 1965 } 1966 1967 static struct notifier_block rtnetlink_dev_notifier = { 1968 .notifier_call = rtnetlink_event, 1969 }; 1970 1971 1972 static int __net_init rtnetlink_net_init(struct net *net) 1973 { 1974 struct sock *sk; 1975 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1976 rtnetlink_rcv, NULL, THIS_MODULE); 1977 if (!sk) 1978 return -ENOMEM; 1979 net->rtnl = sk; 1980 return 0; 1981 } 1982 1983 static void __net_exit rtnetlink_net_exit(struct net *net) 1984 { 1985 netlink_kernel_release(net->rtnl); 1986 net->rtnl = NULL; 1987 } 1988 1989 static struct pernet_operations rtnetlink_net_ops = { 1990 .init = rtnetlink_net_init, 1991 .exit = rtnetlink_net_exit, 1992 }; 1993 1994 void __init rtnetlink_init(void) 1995 { 1996 int i; 1997 1998 rtattr_max = 0; 1999 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 2000 if (rta_max[i] > rtattr_max) 2001 rtattr_max = rta_max[i]; 2002 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 2003 if (!rta_buf) 2004 panic("rtnetlink_init: cannot allocate rta_buf\n"); 2005 2006 if (register_pernet_subsys(&rtnetlink_net_ops)) 2007 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2008 2009 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 2010 register_netdevice_notifier(&rtnetlink_dev_notifier); 2011 2012 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 2013 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 2014 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 2015 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 2016 2017 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 2018 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 2019 } 2020 2021