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/if_bridge.h> 39 #include <linux/pci.h> 40 #include <linux/etherdevice.h> 41 42 #include <asm/uaccess.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 #include <net/net_namespace.h> 56 57 struct rtnl_link { 58 rtnl_doit_func doit; 59 rtnl_dumpit_func dumpit; 60 rtnl_calcit_func calcit; 61 }; 62 63 static DEFINE_MUTEX(rtnl_mutex); 64 65 void rtnl_lock(void) 66 { 67 mutex_lock(&rtnl_mutex); 68 } 69 EXPORT_SYMBOL(rtnl_lock); 70 71 void __rtnl_unlock(void) 72 { 73 mutex_unlock(&rtnl_mutex); 74 } 75 76 void rtnl_unlock(void) 77 { 78 /* This fellow will unlock it for us. */ 79 netdev_run_todo(); 80 } 81 EXPORT_SYMBOL(rtnl_unlock); 82 83 int rtnl_trylock(void) 84 { 85 return mutex_trylock(&rtnl_mutex); 86 } 87 EXPORT_SYMBOL(rtnl_trylock); 88 89 int rtnl_is_locked(void) 90 { 91 return mutex_is_locked(&rtnl_mutex); 92 } 93 EXPORT_SYMBOL(rtnl_is_locked); 94 95 #ifdef CONFIG_PROVE_LOCKING 96 int lockdep_rtnl_is_held(void) 97 { 98 return lockdep_is_held(&rtnl_mutex); 99 } 100 EXPORT_SYMBOL(lockdep_rtnl_is_held); 101 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 102 103 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 104 105 static inline int rtm_msgindex(int msgtype) 106 { 107 int msgindex = msgtype - RTM_BASE; 108 109 /* 110 * msgindex < 0 implies someone tried to register a netlink 111 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 112 * the message type has not been added to linux/rtnetlink.h 113 */ 114 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 115 116 return msgindex; 117 } 118 119 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 120 { 121 struct rtnl_link *tab; 122 123 if (protocol <= RTNL_FAMILY_MAX) 124 tab = rtnl_msg_handlers[protocol]; 125 else 126 tab = NULL; 127 128 if (tab == NULL || tab[msgindex].doit == NULL) 129 tab = rtnl_msg_handlers[PF_UNSPEC]; 130 131 return tab[msgindex].doit; 132 } 133 134 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 135 { 136 struct rtnl_link *tab; 137 138 if (protocol <= RTNL_FAMILY_MAX) 139 tab = rtnl_msg_handlers[protocol]; 140 else 141 tab = NULL; 142 143 if (tab == NULL || tab[msgindex].dumpit == NULL) 144 tab = rtnl_msg_handlers[PF_UNSPEC]; 145 146 return tab[msgindex].dumpit; 147 } 148 149 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 150 { 151 struct rtnl_link *tab; 152 153 if (protocol <= RTNL_FAMILY_MAX) 154 tab = rtnl_msg_handlers[protocol]; 155 else 156 tab = NULL; 157 158 if (tab == NULL || tab[msgindex].calcit == NULL) 159 tab = rtnl_msg_handlers[PF_UNSPEC]; 160 161 return tab[msgindex].calcit; 162 } 163 164 /** 165 * __rtnl_register - Register a rtnetlink message type 166 * @protocol: Protocol family or PF_UNSPEC 167 * @msgtype: rtnetlink message type 168 * @doit: Function pointer called for each request message 169 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 170 * @calcit: Function pointer to calc size of dump message 171 * 172 * Registers the specified function pointers (at least one of them has 173 * to be non-NULL) to be called whenever a request message for the 174 * specified protocol family and message type is received. 175 * 176 * The special protocol family PF_UNSPEC may be used to define fallback 177 * function pointers for the case when no entry for the specific protocol 178 * family exists. 179 * 180 * Returns 0 on success or a negative error code. 181 */ 182 int __rtnl_register(int protocol, int msgtype, 183 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 184 rtnl_calcit_func calcit) 185 { 186 struct rtnl_link *tab; 187 int msgindex; 188 189 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 190 msgindex = rtm_msgindex(msgtype); 191 192 tab = rtnl_msg_handlers[protocol]; 193 if (tab == NULL) { 194 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 195 if (tab == NULL) 196 return -ENOBUFS; 197 198 rtnl_msg_handlers[protocol] = tab; 199 } 200 201 if (doit) 202 tab[msgindex].doit = doit; 203 204 if (dumpit) 205 tab[msgindex].dumpit = dumpit; 206 207 if (calcit) 208 tab[msgindex].calcit = calcit; 209 210 return 0; 211 } 212 EXPORT_SYMBOL_GPL(__rtnl_register); 213 214 /** 215 * rtnl_register - Register a rtnetlink message type 216 * 217 * Identical to __rtnl_register() but panics on failure. This is useful 218 * as failure of this function is very unlikely, it can only happen due 219 * to lack of memory when allocating the chain to store all message 220 * handlers for a protocol. Meant for use in init functions where lack 221 * of memory implies no sense in continuing. 222 */ 223 void rtnl_register(int protocol, int msgtype, 224 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 225 rtnl_calcit_func calcit) 226 { 227 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 228 panic("Unable to register rtnetlink message handler, " 229 "protocol = %d, message type = %d\n", 230 protocol, msgtype); 231 } 232 EXPORT_SYMBOL_GPL(rtnl_register); 233 234 /** 235 * rtnl_unregister - Unregister a rtnetlink message type 236 * @protocol: Protocol family or PF_UNSPEC 237 * @msgtype: rtnetlink message type 238 * 239 * Returns 0 on success or a negative error code. 240 */ 241 int rtnl_unregister(int protocol, int msgtype) 242 { 243 int msgindex; 244 245 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 246 msgindex = rtm_msgindex(msgtype); 247 248 if (rtnl_msg_handlers[protocol] == NULL) 249 return -ENOENT; 250 251 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 252 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 253 254 return 0; 255 } 256 EXPORT_SYMBOL_GPL(rtnl_unregister); 257 258 /** 259 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 260 * @protocol : Protocol family or PF_UNSPEC 261 * 262 * Identical to calling rtnl_unregster() for all registered message types 263 * of a certain protocol family. 264 */ 265 void rtnl_unregister_all(int protocol) 266 { 267 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 268 269 kfree(rtnl_msg_handlers[protocol]); 270 rtnl_msg_handlers[protocol] = NULL; 271 } 272 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 273 274 static LIST_HEAD(link_ops); 275 276 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 277 { 278 const struct rtnl_link_ops *ops; 279 280 list_for_each_entry(ops, &link_ops, list) { 281 if (!strcmp(ops->kind, kind)) 282 return ops; 283 } 284 return NULL; 285 } 286 287 /** 288 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 289 * @ops: struct rtnl_link_ops * to register 290 * 291 * The caller must hold the rtnl_mutex. This function should be used 292 * by drivers that create devices during module initialization. It 293 * must be called before registering the devices. 294 * 295 * Returns 0 on success or a negative error code. 296 */ 297 int __rtnl_link_register(struct rtnl_link_ops *ops) 298 { 299 if (rtnl_link_ops_get(ops->kind)) 300 return -EEXIST; 301 302 if (!ops->dellink) 303 ops->dellink = unregister_netdevice_queue; 304 305 list_add_tail(&ops->list, &link_ops); 306 return 0; 307 } 308 EXPORT_SYMBOL_GPL(__rtnl_link_register); 309 310 /** 311 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 312 * @ops: struct rtnl_link_ops * to register 313 * 314 * Returns 0 on success or a negative error code. 315 */ 316 int rtnl_link_register(struct rtnl_link_ops *ops) 317 { 318 int err; 319 320 rtnl_lock(); 321 err = __rtnl_link_register(ops); 322 rtnl_unlock(); 323 return err; 324 } 325 EXPORT_SYMBOL_GPL(rtnl_link_register); 326 327 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 328 { 329 struct net_device *dev; 330 LIST_HEAD(list_kill); 331 332 for_each_netdev(net, dev) { 333 if (dev->rtnl_link_ops == ops) 334 ops->dellink(dev, &list_kill); 335 } 336 unregister_netdevice_many(&list_kill); 337 } 338 339 /** 340 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 341 * @ops: struct rtnl_link_ops * to unregister 342 * 343 * The caller must hold the rtnl_mutex. 344 */ 345 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 346 { 347 struct net *net; 348 349 for_each_net(net) { 350 __rtnl_kill_links(net, ops); 351 } 352 list_del(&ops->list); 353 } 354 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 355 356 /** 357 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 358 * @ops: struct rtnl_link_ops * to unregister 359 */ 360 void rtnl_link_unregister(struct rtnl_link_ops *ops) 361 { 362 rtnl_lock(); 363 __rtnl_link_unregister(ops); 364 rtnl_unlock(); 365 } 366 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 367 368 static size_t rtnl_link_get_size(const struct net_device *dev) 369 { 370 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 371 size_t size; 372 373 if (!ops) 374 return 0; 375 376 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 377 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 378 379 if (ops->get_size) 380 /* IFLA_INFO_DATA + nested data */ 381 size += nla_total_size(sizeof(struct nlattr)) + 382 ops->get_size(dev); 383 384 if (ops->get_xstats_size) 385 /* IFLA_INFO_XSTATS */ 386 size += nla_total_size(ops->get_xstats_size(dev)); 387 388 return size; 389 } 390 391 static LIST_HEAD(rtnl_af_ops); 392 393 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 394 { 395 const struct rtnl_af_ops *ops; 396 397 list_for_each_entry(ops, &rtnl_af_ops, list) { 398 if (ops->family == family) 399 return ops; 400 } 401 402 return NULL; 403 } 404 405 /** 406 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink. 407 * @ops: struct rtnl_af_ops * to register 408 * 409 * The caller must hold the rtnl_mutex. 410 * 411 * Returns 0 on success or a negative error code. 412 */ 413 int __rtnl_af_register(struct rtnl_af_ops *ops) 414 { 415 list_add_tail(&ops->list, &rtnl_af_ops); 416 return 0; 417 } 418 EXPORT_SYMBOL_GPL(__rtnl_af_register); 419 420 /** 421 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 422 * @ops: struct rtnl_af_ops * to register 423 * 424 * Returns 0 on success or a negative error code. 425 */ 426 int rtnl_af_register(struct rtnl_af_ops *ops) 427 { 428 int err; 429 430 rtnl_lock(); 431 err = __rtnl_af_register(ops); 432 rtnl_unlock(); 433 return err; 434 } 435 EXPORT_SYMBOL_GPL(rtnl_af_register); 436 437 /** 438 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 439 * @ops: struct rtnl_af_ops * to unregister 440 * 441 * The caller must hold the rtnl_mutex. 442 */ 443 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 444 { 445 list_del(&ops->list); 446 } 447 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 448 449 /** 450 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 451 * @ops: struct rtnl_af_ops * to unregister 452 */ 453 void rtnl_af_unregister(struct rtnl_af_ops *ops) 454 { 455 rtnl_lock(); 456 __rtnl_af_unregister(ops); 457 rtnl_unlock(); 458 } 459 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 460 461 static size_t rtnl_link_get_af_size(const struct net_device *dev) 462 { 463 struct rtnl_af_ops *af_ops; 464 size_t size; 465 466 /* IFLA_AF_SPEC */ 467 size = nla_total_size(sizeof(struct nlattr)); 468 469 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 470 if (af_ops->get_link_af_size) { 471 /* AF_* + nested data */ 472 size += nla_total_size(sizeof(struct nlattr)) + 473 af_ops->get_link_af_size(dev); 474 } 475 } 476 477 return size; 478 } 479 480 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 481 { 482 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 483 struct nlattr *linkinfo, *data; 484 int err = -EMSGSIZE; 485 486 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 487 if (linkinfo == NULL) 488 goto out; 489 490 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 491 goto err_cancel_link; 492 if (ops->fill_xstats) { 493 err = ops->fill_xstats(skb, dev); 494 if (err < 0) 495 goto err_cancel_link; 496 } 497 if (ops->fill_info) { 498 data = nla_nest_start(skb, IFLA_INFO_DATA); 499 if (data == NULL) { 500 err = -EMSGSIZE; 501 goto err_cancel_link; 502 } 503 err = ops->fill_info(skb, dev); 504 if (err < 0) 505 goto err_cancel_data; 506 nla_nest_end(skb, data); 507 } 508 509 nla_nest_end(skb, linkinfo); 510 return 0; 511 512 err_cancel_data: 513 nla_nest_cancel(skb, data); 514 err_cancel_link: 515 nla_nest_cancel(skb, linkinfo); 516 out: 517 return err; 518 } 519 520 static const int rtm_min[RTM_NR_FAMILIES] = 521 { 522 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 523 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 524 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 525 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 526 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 527 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 528 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 529 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 530 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 531 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 532 }; 533 534 static const int rta_max[RTM_NR_FAMILIES] = 535 { 536 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 537 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 538 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 539 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 540 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 541 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 542 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 543 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 544 }; 545 546 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 547 { 548 struct sock *rtnl = net->rtnl; 549 int err = 0; 550 551 NETLINK_CB(skb).dst_group = group; 552 if (echo) 553 atomic_inc(&skb->users); 554 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 555 if (echo) 556 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 557 return err; 558 } 559 560 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 561 { 562 struct sock *rtnl = net->rtnl; 563 564 return nlmsg_unicast(rtnl, skb, pid); 565 } 566 EXPORT_SYMBOL(rtnl_unicast); 567 568 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 569 struct nlmsghdr *nlh, gfp_t flags) 570 { 571 struct sock *rtnl = net->rtnl; 572 int report = 0; 573 574 if (nlh) 575 report = nlmsg_report(nlh); 576 577 nlmsg_notify(rtnl, skb, pid, group, report, flags); 578 } 579 EXPORT_SYMBOL(rtnl_notify); 580 581 void rtnl_set_sk_err(struct net *net, u32 group, int error) 582 { 583 struct sock *rtnl = net->rtnl; 584 585 netlink_set_err(rtnl, 0, group, error); 586 } 587 EXPORT_SYMBOL(rtnl_set_sk_err); 588 589 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 590 { 591 struct nlattr *mx; 592 int i, valid = 0; 593 594 mx = nla_nest_start(skb, RTA_METRICS); 595 if (mx == NULL) 596 return -ENOBUFS; 597 598 for (i = 0; i < RTAX_MAX; i++) { 599 if (metrics[i]) { 600 valid++; 601 if (nla_put_u32(skb, i+1, metrics[i])) 602 goto nla_put_failure; 603 } 604 } 605 606 if (!valid) { 607 nla_nest_cancel(skb, mx); 608 return 0; 609 } 610 611 return nla_nest_end(skb, mx); 612 613 nla_put_failure: 614 nla_nest_cancel(skb, mx); 615 return -EMSGSIZE; 616 } 617 EXPORT_SYMBOL(rtnetlink_put_metrics); 618 619 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 620 long expires, u32 error) 621 { 622 struct rta_cacheinfo ci = { 623 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 624 .rta_used = dst->__use, 625 .rta_clntref = atomic_read(&(dst->__refcnt)), 626 .rta_error = error, 627 .rta_id = id, 628 }; 629 630 if (expires) { 631 unsigned long clock; 632 633 clock = jiffies_to_clock_t(abs(expires)); 634 clock = min_t(unsigned long, clock, INT_MAX); 635 ci.rta_expires = (expires > 0) ? clock : -clock; 636 } 637 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 638 } 639 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 640 641 static void set_operstate(struct net_device *dev, unsigned char transition) 642 { 643 unsigned char operstate = dev->operstate; 644 645 switch (transition) { 646 case IF_OPER_UP: 647 if ((operstate == IF_OPER_DORMANT || 648 operstate == IF_OPER_UNKNOWN) && 649 !netif_dormant(dev)) 650 operstate = IF_OPER_UP; 651 break; 652 653 case IF_OPER_DORMANT: 654 if (operstate == IF_OPER_UP || 655 operstate == IF_OPER_UNKNOWN) 656 operstate = IF_OPER_DORMANT; 657 break; 658 } 659 660 if (dev->operstate != operstate) { 661 write_lock_bh(&dev_base_lock); 662 dev->operstate = operstate; 663 write_unlock_bh(&dev_base_lock); 664 netdev_state_change(dev); 665 } 666 } 667 668 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 669 { 670 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 671 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 672 } 673 674 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 675 const struct ifinfomsg *ifm) 676 { 677 unsigned int flags = ifm->ifi_flags; 678 679 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 680 if (ifm->ifi_change) 681 flags = (flags & ifm->ifi_change) | 682 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 683 684 return flags; 685 } 686 687 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 688 const struct rtnl_link_stats64 *b) 689 { 690 a->rx_packets = b->rx_packets; 691 a->tx_packets = b->tx_packets; 692 a->rx_bytes = b->rx_bytes; 693 a->tx_bytes = b->tx_bytes; 694 a->rx_errors = b->rx_errors; 695 a->tx_errors = b->tx_errors; 696 a->rx_dropped = b->rx_dropped; 697 a->tx_dropped = b->tx_dropped; 698 699 a->multicast = b->multicast; 700 a->collisions = b->collisions; 701 702 a->rx_length_errors = b->rx_length_errors; 703 a->rx_over_errors = b->rx_over_errors; 704 a->rx_crc_errors = b->rx_crc_errors; 705 a->rx_frame_errors = b->rx_frame_errors; 706 a->rx_fifo_errors = b->rx_fifo_errors; 707 a->rx_missed_errors = b->rx_missed_errors; 708 709 a->tx_aborted_errors = b->tx_aborted_errors; 710 a->tx_carrier_errors = b->tx_carrier_errors; 711 a->tx_fifo_errors = b->tx_fifo_errors; 712 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 713 a->tx_window_errors = b->tx_window_errors; 714 715 a->rx_compressed = b->rx_compressed; 716 a->tx_compressed = b->tx_compressed; 717 } 718 719 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 720 { 721 memcpy(v, b, sizeof(*b)); 722 } 723 724 /* All VF info */ 725 static inline int rtnl_vfinfo_size(const struct net_device *dev, 726 u32 ext_filter_mask) 727 { 728 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 729 (ext_filter_mask & RTEXT_FILTER_VF)) { 730 int num_vfs = dev_num_vf(dev->dev.parent); 731 size_t size = nla_total_size(sizeof(struct nlattr)); 732 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 733 size += num_vfs * 734 (nla_total_size(sizeof(struct ifla_vf_mac)) + 735 nla_total_size(sizeof(struct ifla_vf_vlan)) + 736 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 737 nla_total_size(sizeof(struct ifla_vf_spoofchk))); 738 return size; 739 } else 740 return 0; 741 } 742 743 static size_t rtnl_port_size(const struct net_device *dev) 744 { 745 size_t port_size = nla_total_size(4) /* PORT_VF */ 746 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 747 + nla_total_size(sizeof(struct ifla_port_vsi)) 748 /* PORT_VSI_TYPE */ 749 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 750 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 751 + nla_total_size(1) /* PROT_VDP_REQUEST */ 752 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 753 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 754 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 755 + port_size; 756 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 757 + port_size; 758 759 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 760 return 0; 761 if (dev_num_vf(dev->dev.parent)) 762 return port_self_size + vf_ports_size + 763 vf_port_size * dev_num_vf(dev->dev.parent); 764 else 765 return port_self_size; 766 } 767 768 static noinline size_t if_nlmsg_size(const struct net_device *dev, 769 u32 ext_filter_mask) 770 { 771 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 772 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 773 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 774 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 775 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 776 + nla_total_size(sizeof(struct rtnl_link_stats)) 777 + nla_total_size(sizeof(struct rtnl_link_stats64)) 778 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 779 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 780 + nla_total_size(4) /* IFLA_TXQLEN */ 781 + nla_total_size(4) /* IFLA_WEIGHT */ 782 + nla_total_size(4) /* IFLA_MTU */ 783 + nla_total_size(4) /* IFLA_LINK */ 784 + nla_total_size(4) /* IFLA_MASTER */ 785 + nla_total_size(1) /* IFLA_CARRIER */ 786 + nla_total_size(4) /* IFLA_PROMISCUITY */ 787 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 788 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 789 + nla_total_size(1) /* IFLA_OPERSTATE */ 790 + nla_total_size(1) /* IFLA_LINKMODE */ 791 + nla_total_size(ext_filter_mask 792 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 793 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 794 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 795 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 796 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 797 } 798 799 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 800 { 801 struct nlattr *vf_ports; 802 struct nlattr *vf_port; 803 int vf; 804 int err; 805 806 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 807 if (!vf_ports) 808 return -EMSGSIZE; 809 810 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 811 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 812 if (!vf_port) 813 goto nla_put_failure; 814 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 815 goto nla_put_failure; 816 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 817 if (err == -EMSGSIZE) 818 goto nla_put_failure; 819 if (err) { 820 nla_nest_cancel(skb, vf_port); 821 continue; 822 } 823 nla_nest_end(skb, vf_port); 824 } 825 826 nla_nest_end(skb, vf_ports); 827 828 return 0; 829 830 nla_put_failure: 831 nla_nest_cancel(skb, vf_ports); 832 return -EMSGSIZE; 833 } 834 835 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 836 { 837 struct nlattr *port_self; 838 int err; 839 840 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 841 if (!port_self) 842 return -EMSGSIZE; 843 844 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 845 if (err) { 846 nla_nest_cancel(skb, port_self); 847 return (err == -EMSGSIZE) ? err : 0; 848 } 849 850 nla_nest_end(skb, port_self); 851 852 return 0; 853 } 854 855 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 856 { 857 int err; 858 859 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 860 return 0; 861 862 err = rtnl_port_self_fill(skb, dev); 863 if (err) 864 return err; 865 866 if (dev_num_vf(dev->dev.parent)) { 867 err = rtnl_vf_ports_fill(skb, dev); 868 if (err) 869 return err; 870 } 871 872 return 0; 873 } 874 875 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 876 int type, u32 pid, u32 seq, u32 change, 877 unsigned int flags, u32 ext_filter_mask) 878 { 879 struct ifinfomsg *ifm; 880 struct nlmsghdr *nlh; 881 struct rtnl_link_stats64 temp; 882 const struct rtnl_link_stats64 *stats; 883 struct nlattr *attr, *af_spec; 884 struct rtnl_af_ops *af_ops; 885 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 886 887 ASSERT_RTNL(); 888 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 889 if (nlh == NULL) 890 return -EMSGSIZE; 891 892 ifm = nlmsg_data(nlh); 893 ifm->ifi_family = AF_UNSPEC; 894 ifm->__ifi_pad = 0; 895 ifm->ifi_type = dev->type; 896 ifm->ifi_index = dev->ifindex; 897 ifm->ifi_flags = dev_get_flags(dev); 898 ifm->ifi_change = change; 899 900 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 901 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 902 nla_put_u8(skb, IFLA_OPERSTATE, 903 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 904 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 905 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 906 nla_put_u32(skb, IFLA_GROUP, dev->group) || 907 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 908 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 909 #ifdef CONFIG_RPS 910 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 911 #endif 912 (dev->ifindex != dev->iflink && 913 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 914 (upper_dev && 915 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 916 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 917 (dev->qdisc && 918 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 919 (dev->ifalias && 920 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias))) 921 goto nla_put_failure; 922 923 if (1) { 924 struct rtnl_link_ifmap map = { 925 .mem_start = dev->mem_start, 926 .mem_end = dev->mem_end, 927 .base_addr = dev->base_addr, 928 .irq = dev->irq, 929 .dma = dev->dma, 930 .port = dev->if_port, 931 }; 932 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 933 goto nla_put_failure; 934 } 935 936 if (dev->addr_len) { 937 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 938 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 939 goto nla_put_failure; 940 } 941 942 attr = nla_reserve(skb, IFLA_STATS, 943 sizeof(struct rtnl_link_stats)); 944 if (attr == NULL) 945 goto nla_put_failure; 946 947 stats = dev_get_stats(dev, &temp); 948 copy_rtnl_link_stats(nla_data(attr), stats); 949 950 attr = nla_reserve(skb, IFLA_STATS64, 951 sizeof(struct rtnl_link_stats64)); 952 if (attr == NULL) 953 goto nla_put_failure; 954 copy_rtnl_link_stats64(nla_data(attr), stats); 955 956 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 957 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 958 goto nla_put_failure; 959 960 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 961 && (ext_filter_mask & RTEXT_FILTER_VF)) { 962 int i; 963 964 struct nlattr *vfinfo, *vf; 965 int num_vfs = dev_num_vf(dev->dev.parent); 966 967 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 968 if (!vfinfo) 969 goto nla_put_failure; 970 for (i = 0; i < num_vfs; i++) { 971 struct ifla_vf_info ivi; 972 struct ifla_vf_mac vf_mac; 973 struct ifla_vf_vlan vf_vlan; 974 struct ifla_vf_tx_rate vf_tx_rate; 975 struct ifla_vf_spoofchk vf_spoofchk; 976 977 /* 978 * Not all SR-IOV capable drivers support the 979 * spoofcheck query. Preset to -1 so the user 980 * space tool can detect that the driver didn't 981 * report anything. 982 */ 983 ivi.spoofchk = -1; 984 memset(ivi.mac, 0, sizeof(ivi.mac)); 985 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 986 break; 987 vf_mac.vf = 988 vf_vlan.vf = 989 vf_tx_rate.vf = 990 vf_spoofchk.vf = ivi.vf; 991 992 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 993 vf_vlan.vlan = ivi.vlan; 994 vf_vlan.qos = ivi.qos; 995 vf_tx_rate.rate = ivi.tx_rate; 996 vf_spoofchk.setting = ivi.spoofchk; 997 vf = nla_nest_start(skb, IFLA_VF_INFO); 998 if (!vf) { 999 nla_nest_cancel(skb, vfinfo); 1000 goto nla_put_failure; 1001 } 1002 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1003 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1004 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1005 &vf_tx_rate) || 1006 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1007 &vf_spoofchk)) 1008 goto nla_put_failure; 1009 nla_nest_end(skb, vf); 1010 } 1011 nla_nest_end(skb, vfinfo); 1012 } 1013 1014 if (rtnl_port_fill(skb, dev)) 1015 goto nla_put_failure; 1016 1017 if (dev->rtnl_link_ops) { 1018 if (rtnl_link_fill(skb, dev) < 0) 1019 goto nla_put_failure; 1020 } 1021 1022 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1023 goto nla_put_failure; 1024 1025 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1026 if (af_ops->fill_link_af) { 1027 struct nlattr *af; 1028 int err; 1029 1030 if (!(af = nla_nest_start(skb, af_ops->family))) 1031 goto nla_put_failure; 1032 1033 err = af_ops->fill_link_af(skb, dev); 1034 1035 /* 1036 * Caller may return ENODATA to indicate that there 1037 * was no data to be dumped. This is not an error, it 1038 * means we should trim the attribute header and 1039 * continue. 1040 */ 1041 if (err == -ENODATA) 1042 nla_nest_cancel(skb, af); 1043 else if (err < 0) 1044 goto nla_put_failure; 1045 1046 nla_nest_end(skb, af); 1047 } 1048 } 1049 1050 nla_nest_end(skb, af_spec); 1051 1052 return nlmsg_end(skb, nlh); 1053 1054 nla_put_failure: 1055 nlmsg_cancel(skb, nlh); 1056 return -EMSGSIZE; 1057 } 1058 1059 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1060 { 1061 struct net *net = sock_net(skb->sk); 1062 int h, s_h; 1063 int idx = 0, s_idx; 1064 struct net_device *dev; 1065 struct hlist_head *head; 1066 struct nlattr *tb[IFLA_MAX+1]; 1067 u32 ext_filter_mask = 0; 1068 1069 s_h = cb->args[0]; 1070 s_idx = cb->args[1]; 1071 1072 rcu_read_lock(); 1073 cb->seq = net->dev_base_seq; 1074 1075 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 1076 ifla_policy) >= 0) { 1077 1078 if (tb[IFLA_EXT_MASK]) 1079 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1080 } 1081 1082 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1083 idx = 0; 1084 head = &net->dev_index_head[h]; 1085 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1086 if (idx < s_idx) 1087 goto cont; 1088 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1089 NETLINK_CB(cb->skb).portid, 1090 cb->nlh->nlmsg_seq, 0, 1091 NLM_F_MULTI, 1092 ext_filter_mask) <= 0) 1093 goto out; 1094 1095 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1096 cont: 1097 idx++; 1098 } 1099 } 1100 out: 1101 rcu_read_unlock(); 1102 cb->args[1] = idx; 1103 cb->args[0] = h; 1104 1105 return skb->len; 1106 } 1107 1108 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1109 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1110 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1111 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1112 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1113 [IFLA_MTU] = { .type = NLA_U32 }, 1114 [IFLA_LINK] = { .type = NLA_U32 }, 1115 [IFLA_MASTER] = { .type = NLA_U32 }, 1116 [IFLA_CARRIER] = { .type = NLA_U8 }, 1117 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1118 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1119 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1120 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1121 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1122 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1123 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1124 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1125 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1126 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1127 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1128 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1129 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1130 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1131 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1132 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1133 }; 1134 EXPORT_SYMBOL(ifla_policy); 1135 1136 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1137 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1138 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1139 }; 1140 1141 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1142 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1143 }; 1144 1145 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1146 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1147 .len = sizeof(struct ifla_vf_mac) }, 1148 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1149 .len = sizeof(struct ifla_vf_vlan) }, 1150 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1151 .len = sizeof(struct ifla_vf_tx_rate) }, 1152 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1153 .len = sizeof(struct ifla_vf_spoofchk) }, 1154 }; 1155 1156 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1157 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1158 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1159 .len = PORT_PROFILE_MAX }, 1160 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1161 .len = sizeof(struct ifla_port_vsi)}, 1162 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1163 .len = PORT_UUID_MAX }, 1164 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1165 .len = PORT_UUID_MAX }, 1166 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1167 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1168 }; 1169 1170 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1171 { 1172 struct net *net; 1173 /* Examine the link attributes and figure out which 1174 * network namespace we are talking about. 1175 */ 1176 if (tb[IFLA_NET_NS_PID]) 1177 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1178 else if (tb[IFLA_NET_NS_FD]) 1179 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1180 else 1181 net = get_net(src_net); 1182 return net; 1183 } 1184 EXPORT_SYMBOL(rtnl_link_get_net); 1185 1186 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1187 { 1188 if (dev) { 1189 if (tb[IFLA_ADDRESS] && 1190 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1191 return -EINVAL; 1192 1193 if (tb[IFLA_BROADCAST] && 1194 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1195 return -EINVAL; 1196 } 1197 1198 if (tb[IFLA_AF_SPEC]) { 1199 struct nlattr *af; 1200 int rem, err; 1201 1202 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1203 const struct rtnl_af_ops *af_ops; 1204 1205 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1206 return -EAFNOSUPPORT; 1207 1208 if (!af_ops->set_link_af) 1209 return -EOPNOTSUPP; 1210 1211 if (af_ops->validate_link_af) { 1212 err = af_ops->validate_link_af(dev, af); 1213 if (err < 0) 1214 return err; 1215 } 1216 } 1217 } 1218 1219 return 0; 1220 } 1221 1222 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1223 { 1224 int rem, err = -EINVAL; 1225 struct nlattr *vf; 1226 const struct net_device_ops *ops = dev->netdev_ops; 1227 1228 nla_for_each_nested(vf, attr, rem) { 1229 switch (nla_type(vf)) { 1230 case IFLA_VF_MAC: { 1231 struct ifla_vf_mac *ivm; 1232 ivm = nla_data(vf); 1233 err = -EOPNOTSUPP; 1234 if (ops->ndo_set_vf_mac) 1235 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1236 ivm->mac); 1237 break; 1238 } 1239 case IFLA_VF_VLAN: { 1240 struct ifla_vf_vlan *ivv; 1241 ivv = nla_data(vf); 1242 err = -EOPNOTSUPP; 1243 if (ops->ndo_set_vf_vlan) 1244 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1245 ivv->vlan, 1246 ivv->qos); 1247 break; 1248 } 1249 case IFLA_VF_TX_RATE: { 1250 struct ifla_vf_tx_rate *ivt; 1251 ivt = nla_data(vf); 1252 err = -EOPNOTSUPP; 1253 if (ops->ndo_set_vf_tx_rate) 1254 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1255 ivt->rate); 1256 break; 1257 } 1258 case IFLA_VF_SPOOFCHK: { 1259 struct ifla_vf_spoofchk *ivs; 1260 ivs = nla_data(vf); 1261 err = -EOPNOTSUPP; 1262 if (ops->ndo_set_vf_spoofchk) 1263 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1264 ivs->setting); 1265 break; 1266 } 1267 default: 1268 err = -EINVAL; 1269 break; 1270 } 1271 if (err) 1272 break; 1273 } 1274 return err; 1275 } 1276 1277 static int do_set_master(struct net_device *dev, int ifindex) 1278 { 1279 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1280 const struct net_device_ops *ops; 1281 int err; 1282 1283 if (upper_dev) { 1284 if (upper_dev->ifindex == ifindex) 1285 return 0; 1286 ops = upper_dev->netdev_ops; 1287 if (ops->ndo_del_slave) { 1288 err = ops->ndo_del_slave(upper_dev, dev); 1289 if (err) 1290 return err; 1291 } else { 1292 return -EOPNOTSUPP; 1293 } 1294 } 1295 1296 if (ifindex) { 1297 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1298 if (!upper_dev) 1299 return -EINVAL; 1300 ops = upper_dev->netdev_ops; 1301 if (ops->ndo_add_slave) { 1302 err = ops->ndo_add_slave(upper_dev, dev); 1303 if (err) 1304 return err; 1305 } else { 1306 return -EOPNOTSUPP; 1307 } 1308 } 1309 return 0; 1310 } 1311 1312 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1313 struct nlattr **tb, char *ifname, int modified) 1314 { 1315 const struct net_device_ops *ops = dev->netdev_ops; 1316 int err; 1317 1318 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1319 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1320 if (IS_ERR(net)) { 1321 err = PTR_ERR(net); 1322 goto errout; 1323 } 1324 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) { 1325 err = -EPERM; 1326 goto errout; 1327 } 1328 err = dev_change_net_namespace(dev, net, ifname); 1329 put_net(net); 1330 if (err) 1331 goto errout; 1332 modified = 1; 1333 } 1334 1335 if (tb[IFLA_MAP]) { 1336 struct rtnl_link_ifmap *u_map; 1337 struct ifmap k_map; 1338 1339 if (!ops->ndo_set_config) { 1340 err = -EOPNOTSUPP; 1341 goto errout; 1342 } 1343 1344 if (!netif_device_present(dev)) { 1345 err = -ENODEV; 1346 goto errout; 1347 } 1348 1349 u_map = nla_data(tb[IFLA_MAP]); 1350 k_map.mem_start = (unsigned long) u_map->mem_start; 1351 k_map.mem_end = (unsigned long) u_map->mem_end; 1352 k_map.base_addr = (unsigned short) u_map->base_addr; 1353 k_map.irq = (unsigned char) u_map->irq; 1354 k_map.dma = (unsigned char) u_map->dma; 1355 k_map.port = (unsigned char) u_map->port; 1356 1357 err = ops->ndo_set_config(dev, &k_map); 1358 if (err < 0) 1359 goto errout; 1360 1361 modified = 1; 1362 } 1363 1364 if (tb[IFLA_ADDRESS]) { 1365 struct sockaddr *sa; 1366 int len; 1367 1368 len = sizeof(sa_family_t) + dev->addr_len; 1369 sa = kmalloc(len, GFP_KERNEL); 1370 if (!sa) { 1371 err = -ENOMEM; 1372 goto errout; 1373 } 1374 sa->sa_family = dev->type; 1375 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1376 dev->addr_len); 1377 err = dev_set_mac_address(dev, sa); 1378 kfree(sa); 1379 if (err) 1380 goto errout; 1381 modified = 1; 1382 } 1383 1384 if (tb[IFLA_MTU]) { 1385 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1386 if (err < 0) 1387 goto errout; 1388 modified = 1; 1389 } 1390 1391 if (tb[IFLA_GROUP]) { 1392 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1393 modified = 1; 1394 } 1395 1396 /* 1397 * Interface selected by interface index but interface 1398 * name provided implies that a name change has been 1399 * requested. 1400 */ 1401 if (ifm->ifi_index > 0 && ifname[0]) { 1402 err = dev_change_name(dev, ifname); 1403 if (err < 0) 1404 goto errout; 1405 modified = 1; 1406 } 1407 1408 if (tb[IFLA_IFALIAS]) { 1409 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1410 nla_len(tb[IFLA_IFALIAS])); 1411 if (err < 0) 1412 goto errout; 1413 modified = 1; 1414 } 1415 1416 if (tb[IFLA_BROADCAST]) { 1417 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1418 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1419 } 1420 1421 if (ifm->ifi_flags || ifm->ifi_change) { 1422 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1423 if (err < 0) 1424 goto errout; 1425 } 1426 1427 if (tb[IFLA_MASTER]) { 1428 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1429 if (err) 1430 goto errout; 1431 modified = 1; 1432 } 1433 1434 if (tb[IFLA_CARRIER]) { 1435 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1436 if (err) 1437 goto errout; 1438 modified = 1; 1439 } 1440 1441 if (tb[IFLA_TXQLEN]) 1442 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1443 1444 if (tb[IFLA_OPERSTATE]) 1445 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1446 1447 if (tb[IFLA_LINKMODE]) { 1448 write_lock_bh(&dev_base_lock); 1449 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1450 write_unlock_bh(&dev_base_lock); 1451 } 1452 1453 if (tb[IFLA_VFINFO_LIST]) { 1454 struct nlattr *attr; 1455 int rem; 1456 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1457 if (nla_type(attr) != IFLA_VF_INFO) { 1458 err = -EINVAL; 1459 goto errout; 1460 } 1461 err = do_setvfinfo(dev, attr); 1462 if (err < 0) 1463 goto errout; 1464 modified = 1; 1465 } 1466 } 1467 err = 0; 1468 1469 if (tb[IFLA_VF_PORTS]) { 1470 struct nlattr *port[IFLA_PORT_MAX+1]; 1471 struct nlattr *attr; 1472 int vf; 1473 int rem; 1474 1475 err = -EOPNOTSUPP; 1476 if (!ops->ndo_set_vf_port) 1477 goto errout; 1478 1479 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1480 if (nla_type(attr) != IFLA_VF_PORT) 1481 continue; 1482 err = nla_parse_nested(port, IFLA_PORT_MAX, 1483 attr, ifla_port_policy); 1484 if (err < 0) 1485 goto errout; 1486 if (!port[IFLA_PORT_VF]) { 1487 err = -EOPNOTSUPP; 1488 goto errout; 1489 } 1490 vf = nla_get_u32(port[IFLA_PORT_VF]); 1491 err = ops->ndo_set_vf_port(dev, vf, port); 1492 if (err < 0) 1493 goto errout; 1494 modified = 1; 1495 } 1496 } 1497 err = 0; 1498 1499 if (tb[IFLA_PORT_SELF]) { 1500 struct nlattr *port[IFLA_PORT_MAX+1]; 1501 1502 err = nla_parse_nested(port, IFLA_PORT_MAX, 1503 tb[IFLA_PORT_SELF], ifla_port_policy); 1504 if (err < 0) 1505 goto errout; 1506 1507 err = -EOPNOTSUPP; 1508 if (ops->ndo_set_vf_port) 1509 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1510 if (err < 0) 1511 goto errout; 1512 modified = 1; 1513 } 1514 1515 if (tb[IFLA_AF_SPEC]) { 1516 struct nlattr *af; 1517 int rem; 1518 1519 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1520 const struct rtnl_af_ops *af_ops; 1521 1522 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1523 BUG(); 1524 1525 err = af_ops->set_link_af(dev, af); 1526 if (err < 0) 1527 goto errout; 1528 1529 modified = 1; 1530 } 1531 } 1532 err = 0; 1533 1534 errout: 1535 if (err < 0 && modified) 1536 net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n", 1537 dev->name); 1538 1539 return err; 1540 } 1541 1542 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1543 { 1544 struct net *net = sock_net(skb->sk); 1545 struct ifinfomsg *ifm; 1546 struct net_device *dev; 1547 int err; 1548 struct nlattr *tb[IFLA_MAX+1]; 1549 char ifname[IFNAMSIZ]; 1550 1551 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1552 if (err < 0) 1553 goto errout; 1554 1555 if (tb[IFLA_IFNAME]) 1556 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1557 else 1558 ifname[0] = '\0'; 1559 1560 err = -EINVAL; 1561 ifm = nlmsg_data(nlh); 1562 if (ifm->ifi_index > 0) 1563 dev = __dev_get_by_index(net, ifm->ifi_index); 1564 else if (tb[IFLA_IFNAME]) 1565 dev = __dev_get_by_name(net, ifname); 1566 else 1567 goto errout; 1568 1569 if (dev == NULL) { 1570 err = -ENODEV; 1571 goto errout; 1572 } 1573 1574 err = validate_linkmsg(dev, tb); 1575 if (err < 0) 1576 goto errout; 1577 1578 err = do_setlink(dev, ifm, tb, ifname, 0); 1579 errout: 1580 return err; 1581 } 1582 1583 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1584 { 1585 struct net *net = sock_net(skb->sk); 1586 const struct rtnl_link_ops *ops; 1587 struct net_device *dev; 1588 struct ifinfomsg *ifm; 1589 char ifname[IFNAMSIZ]; 1590 struct nlattr *tb[IFLA_MAX+1]; 1591 int err; 1592 LIST_HEAD(list_kill); 1593 1594 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1595 if (err < 0) 1596 return err; 1597 1598 if (tb[IFLA_IFNAME]) 1599 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1600 1601 ifm = nlmsg_data(nlh); 1602 if (ifm->ifi_index > 0) 1603 dev = __dev_get_by_index(net, ifm->ifi_index); 1604 else if (tb[IFLA_IFNAME]) 1605 dev = __dev_get_by_name(net, ifname); 1606 else 1607 return -EINVAL; 1608 1609 if (!dev) 1610 return -ENODEV; 1611 1612 ops = dev->rtnl_link_ops; 1613 if (!ops) 1614 return -EOPNOTSUPP; 1615 1616 ops->dellink(dev, &list_kill); 1617 unregister_netdevice_many(&list_kill); 1618 list_del(&list_kill); 1619 return 0; 1620 } 1621 1622 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1623 { 1624 unsigned int old_flags; 1625 int err; 1626 1627 old_flags = dev->flags; 1628 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1629 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1630 if (err < 0) 1631 return err; 1632 } 1633 1634 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1635 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1636 1637 __dev_notify_flags(dev, old_flags); 1638 return 0; 1639 } 1640 EXPORT_SYMBOL(rtnl_configure_link); 1641 1642 struct net_device *rtnl_create_link(struct net *net, 1643 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1644 { 1645 int err; 1646 struct net_device *dev; 1647 unsigned int num_tx_queues = 1; 1648 unsigned int num_rx_queues = 1; 1649 1650 if (tb[IFLA_NUM_TX_QUEUES]) 1651 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1652 else if (ops->get_num_tx_queues) 1653 num_tx_queues = ops->get_num_tx_queues(); 1654 1655 if (tb[IFLA_NUM_RX_QUEUES]) 1656 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1657 else if (ops->get_num_rx_queues) 1658 num_rx_queues = ops->get_num_rx_queues(); 1659 1660 err = -ENOMEM; 1661 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup, 1662 num_tx_queues, num_rx_queues); 1663 if (!dev) 1664 goto err; 1665 1666 dev_net_set(dev, net); 1667 dev->rtnl_link_ops = ops; 1668 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1669 1670 if (tb[IFLA_MTU]) 1671 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1672 if (tb[IFLA_ADDRESS]) { 1673 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1674 nla_len(tb[IFLA_ADDRESS])); 1675 dev->addr_assign_type = NET_ADDR_SET; 1676 } 1677 if (tb[IFLA_BROADCAST]) 1678 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1679 nla_len(tb[IFLA_BROADCAST])); 1680 if (tb[IFLA_TXQLEN]) 1681 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1682 if (tb[IFLA_OPERSTATE]) 1683 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1684 if (tb[IFLA_LINKMODE]) 1685 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1686 if (tb[IFLA_GROUP]) 1687 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1688 1689 return dev; 1690 1691 err: 1692 return ERR_PTR(err); 1693 } 1694 EXPORT_SYMBOL(rtnl_create_link); 1695 1696 static int rtnl_group_changelink(struct net *net, int group, 1697 struct ifinfomsg *ifm, 1698 struct nlattr **tb) 1699 { 1700 struct net_device *dev; 1701 int err; 1702 1703 for_each_netdev(net, dev) { 1704 if (dev->group == group) { 1705 err = do_setlink(dev, ifm, tb, NULL, 0); 1706 if (err < 0) 1707 return err; 1708 } 1709 } 1710 1711 return 0; 1712 } 1713 1714 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1715 { 1716 struct net *net = sock_net(skb->sk); 1717 const struct rtnl_link_ops *ops; 1718 struct net_device *dev; 1719 struct ifinfomsg *ifm; 1720 char kind[MODULE_NAME_LEN]; 1721 char ifname[IFNAMSIZ]; 1722 struct nlattr *tb[IFLA_MAX+1]; 1723 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1724 int err; 1725 1726 #ifdef CONFIG_MODULES 1727 replay: 1728 #endif 1729 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1730 if (err < 0) 1731 return err; 1732 1733 if (tb[IFLA_IFNAME]) 1734 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1735 else 1736 ifname[0] = '\0'; 1737 1738 ifm = nlmsg_data(nlh); 1739 if (ifm->ifi_index > 0) 1740 dev = __dev_get_by_index(net, ifm->ifi_index); 1741 else { 1742 if (ifname[0]) 1743 dev = __dev_get_by_name(net, ifname); 1744 else 1745 dev = NULL; 1746 } 1747 1748 err = validate_linkmsg(dev, tb); 1749 if (err < 0) 1750 return err; 1751 1752 if (tb[IFLA_LINKINFO]) { 1753 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1754 tb[IFLA_LINKINFO], ifla_info_policy); 1755 if (err < 0) 1756 return err; 1757 } else 1758 memset(linkinfo, 0, sizeof(linkinfo)); 1759 1760 if (linkinfo[IFLA_INFO_KIND]) { 1761 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1762 ops = rtnl_link_ops_get(kind); 1763 } else { 1764 kind[0] = '\0'; 1765 ops = NULL; 1766 } 1767 1768 if (1) { 1769 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1770 struct net *dest_net; 1771 1772 if (ops) { 1773 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1774 err = nla_parse_nested(attr, ops->maxtype, 1775 linkinfo[IFLA_INFO_DATA], 1776 ops->policy); 1777 if (err < 0) 1778 return err; 1779 data = attr; 1780 } 1781 if (ops->validate) { 1782 err = ops->validate(tb, data); 1783 if (err < 0) 1784 return err; 1785 } 1786 } 1787 1788 if (dev) { 1789 int modified = 0; 1790 1791 if (nlh->nlmsg_flags & NLM_F_EXCL) 1792 return -EEXIST; 1793 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1794 return -EOPNOTSUPP; 1795 1796 if (linkinfo[IFLA_INFO_DATA]) { 1797 if (!ops || ops != dev->rtnl_link_ops || 1798 !ops->changelink) 1799 return -EOPNOTSUPP; 1800 1801 err = ops->changelink(dev, tb, data); 1802 if (err < 0) 1803 return err; 1804 modified = 1; 1805 } 1806 1807 return do_setlink(dev, ifm, tb, ifname, modified); 1808 } 1809 1810 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1811 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1812 return rtnl_group_changelink(net, 1813 nla_get_u32(tb[IFLA_GROUP]), 1814 ifm, tb); 1815 return -ENODEV; 1816 } 1817 1818 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1819 return -EOPNOTSUPP; 1820 1821 if (!ops) { 1822 #ifdef CONFIG_MODULES 1823 if (kind[0]) { 1824 __rtnl_unlock(); 1825 request_module("rtnl-link-%s", kind); 1826 rtnl_lock(); 1827 ops = rtnl_link_ops_get(kind); 1828 if (ops) 1829 goto replay; 1830 } 1831 #endif 1832 return -EOPNOTSUPP; 1833 } 1834 1835 if (!ifname[0]) 1836 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1837 1838 dest_net = rtnl_link_get_net(net, tb); 1839 if (IS_ERR(dest_net)) 1840 return PTR_ERR(dest_net); 1841 1842 dev = rtnl_create_link(dest_net, ifname, ops, tb); 1843 if (IS_ERR(dev)) { 1844 err = PTR_ERR(dev); 1845 goto out; 1846 } 1847 1848 dev->ifindex = ifm->ifi_index; 1849 1850 if (ops->newlink) 1851 err = ops->newlink(net, dev, tb, data); 1852 else 1853 err = register_netdevice(dev); 1854 1855 if (err < 0 && !IS_ERR(dev)) 1856 free_netdev(dev); 1857 if (err < 0) 1858 goto out; 1859 1860 err = rtnl_configure_link(dev, ifm); 1861 if (err < 0) 1862 unregister_netdevice(dev); 1863 out: 1864 put_net(dest_net); 1865 return err; 1866 } 1867 } 1868 1869 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1870 { 1871 struct net *net = sock_net(skb->sk); 1872 struct ifinfomsg *ifm; 1873 char ifname[IFNAMSIZ]; 1874 struct nlattr *tb[IFLA_MAX+1]; 1875 struct net_device *dev = NULL; 1876 struct sk_buff *nskb; 1877 int err; 1878 u32 ext_filter_mask = 0; 1879 1880 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1881 if (err < 0) 1882 return err; 1883 1884 if (tb[IFLA_IFNAME]) 1885 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1886 1887 if (tb[IFLA_EXT_MASK]) 1888 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1889 1890 ifm = nlmsg_data(nlh); 1891 if (ifm->ifi_index > 0) 1892 dev = __dev_get_by_index(net, ifm->ifi_index); 1893 else if (tb[IFLA_IFNAME]) 1894 dev = __dev_get_by_name(net, ifname); 1895 else 1896 return -EINVAL; 1897 1898 if (dev == NULL) 1899 return -ENODEV; 1900 1901 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1902 if (nskb == NULL) 1903 return -ENOBUFS; 1904 1905 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 1906 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1907 if (err < 0) { 1908 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1909 WARN_ON(err == -EMSGSIZE); 1910 kfree_skb(nskb); 1911 } else 1912 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 1913 1914 return err; 1915 } 1916 1917 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1918 { 1919 struct net *net = sock_net(skb->sk); 1920 struct net_device *dev; 1921 struct nlattr *tb[IFLA_MAX+1]; 1922 u32 ext_filter_mask = 0; 1923 u16 min_ifinfo_dump_size = 0; 1924 1925 if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 1926 ifla_policy) >= 0) { 1927 if (tb[IFLA_EXT_MASK]) 1928 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1929 } 1930 1931 if (!ext_filter_mask) 1932 return NLMSG_GOODSIZE; 1933 /* 1934 * traverse the list of net devices and compute the minimum 1935 * buffer size based upon the filter mask. 1936 */ 1937 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1938 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1939 if_nlmsg_size(dev, 1940 ext_filter_mask)); 1941 } 1942 1943 return min_ifinfo_dump_size; 1944 } 1945 1946 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1947 { 1948 int idx; 1949 int s_idx = cb->family; 1950 1951 if (s_idx == 0) 1952 s_idx = 1; 1953 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1954 int type = cb->nlh->nlmsg_type-RTM_BASE; 1955 if (idx < s_idx || idx == PF_PACKET) 1956 continue; 1957 if (rtnl_msg_handlers[idx] == NULL || 1958 rtnl_msg_handlers[idx][type].dumpit == NULL) 1959 continue; 1960 if (idx > s_idx) 1961 memset(&cb->args[0], 0, sizeof(cb->args)); 1962 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1963 break; 1964 } 1965 cb->family = idx; 1966 1967 return skb->len; 1968 } 1969 1970 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change) 1971 { 1972 struct net *net = dev_net(dev); 1973 struct sk_buff *skb; 1974 int err = -ENOBUFS; 1975 size_t if_info_size; 1976 1977 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL); 1978 if (skb == NULL) 1979 goto errout; 1980 1981 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 1982 if (err < 0) { 1983 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1984 WARN_ON(err == -EMSGSIZE); 1985 kfree_skb(skb); 1986 goto errout; 1987 } 1988 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1989 return; 1990 errout: 1991 if (err < 0) 1992 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1993 } 1994 EXPORT_SYMBOL(rtmsg_ifinfo); 1995 1996 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 1997 struct net_device *dev, 1998 u8 *addr, u32 pid, u32 seq, 1999 int type, unsigned int flags) 2000 { 2001 struct nlmsghdr *nlh; 2002 struct ndmsg *ndm; 2003 2004 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI); 2005 if (!nlh) 2006 return -EMSGSIZE; 2007 2008 ndm = nlmsg_data(nlh); 2009 ndm->ndm_family = AF_BRIDGE; 2010 ndm->ndm_pad1 = 0; 2011 ndm->ndm_pad2 = 0; 2012 ndm->ndm_flags = flags; 2013 ndm->ndm_type = 0; 2014 ndm->ndm_ifindex = dev->ifindex; 2015 ndm->ndm_state = NUD_PERMANENT; 2016 2017 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2018 goto nla_put_failure; 2019 2020 return nlmsg_end(skb, nlh); 2021 2022 nla_put_failure: 2023 nlmsg_cancel(skb, nlh); 2024 return -EMSGSIZE; 2025 } 2026 2027 static inline size_t rtnl_fdb_nlmsg_size(void) 2028 { 2029 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2030 } 2031 2032 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2033 { 2034 struct net *net = dev_net(dev); 2035 struct sk_buff *skb; 2036 int err = -ENOBUFS; 2037 2038 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2039 if (!skb) 2040 goto errout; 2041 2042 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF); 2043 if (err < 0) { 2044 kfree_skb(skb); 2045 goto errout; 2046 } 2047 2048 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2049 return; 2050 errout: 2051 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2052 } 2053 2054 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2055 { 2056 struct net *net = sock_net(skb->sk); 2057 struct ndmsg *ndm; 2058 struct nlattr *tb[NDA_MAX+1]; 2059 struct net_device *dev; 2060 u8 *addr; 2061 int err; 2062 2063 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2064 if (err < 0) 2065 return err; 2066 2067 ndm = nlmsg_data(nlh); 2068 if (ndm->ndm_ifindex == 0) { 2069 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2070 return -EINVAL; 2071 } 2072 2073 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2074 if (dev == NULL) { 2075 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2076 return -ENODEV; 2077 } 2078 2079 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2080 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2081 return -EINVAL; 2082 } 2083 2084 addr = nla_data(tb[NDA_LLADDR]); 2085 if (!is_valid_ether_addr(addr)) { 2086 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n"); 2087 return -EINVAL; 2088 } 2089 2090 err = -EOPNOTSUPP; 2091 2092 /* Support fdb on master device the net/bridge default case */ 2093 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2094 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2095 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2096 const struct net_device_ops *ops = br_dev->netdev_ops; 2097 2098 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags); 2099 if (err) 2100 goto out; 2101 else 2102 ndm->ndm_flags &= ~NTF_MASTER; 2103 } 2104 2105 /* Embedded bridge, macvlan, and any other device support */ 2106 if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_add) { 2107 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, 2108 dev, addr, 2109 nlh->nlmsg_flags); 2110 2111 if (!err) { 2112 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2113 ndm->ndm_flags &= ~NTF_SELF; 2114 } 2115 } 2116 out: 2117 return err; 2118 } 2119 2120 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2121 { 2122 struct net *net = sock_net(skb->sk); 2123 struct ndmsg *ndm; 2124 struct nlattr *tb[NDA_MAX+1]; 2125 struct net_device *dev; 2126 int err = -EINVAL; 2127 __u8 *addr; 2128 2129 if (!capable(CAP_NET_ADMIN)) 2130 return -EPERM; 2131 2132 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2133 if (err < 0) 2134 return err; 2135 2136 ndm = nlmsg_data(nlh); 2137 if (ndm->ndm_ifindex == 0) { 2138 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2139 return -EINVAL; 2140 } 2141 2142 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2143 if (dev == NULL) { 2144 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2145 return -ENODEV; 2146 } 2147 2148 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2149 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2150 return -EINVAL; 2151 } 2152 2153 addr = nla_data(tb[NDA_LLADDR]); 2154 if (!is_valid_ether_addr(addr)) { 2155 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ether address\n"); 2156 return -EINVAL; 2157 } 2158 2159 err = -EOPNOTSUPP; 2160 2161 /* Support fdb on master device the net/bridge default case */ 2162 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2163 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2164 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2165 const struct net_device_ops *ops = br_dev->netdev_ops; 2166 2167 if (ops->ndo_fdb_del) 2168 err = ops->ndo_fdb_del(ndm, tb, dev, addr); 2169 2170 if (err) 2171 goto out; 2172 else 2173 ndm->ndm_flags &= ~NTF_MASTER; 2174 } 2175 2176 /* Embedded bridge, macvlan, and any other device support */ 2177 if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_del) { 2178 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr); 2179 2180 if (!err) { 2181 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2182 ndm->ndm_flags &= ~NTF_SELF; 2183 } 2184 } 2185 out: 2186 return err; 2187 } 2188 2189 static int nlmsg_populate_fdb(struct sk_buff *skb, 2190 struct netlink_callback *cb, 2191 struct net_device *dev, 2192 int *idx, 2193 struct netdev_hw_addr_list *list) 2194 { 2195 struct netdev_hw_addr *ha; 2196 int err; 2197 u32 portid, seq; 2198 2199 portid = NETLINK_CB(cb->skb).portid; 2200 seq = cb->nlh->nlmsg_seq; 2201 2202 list_for_each_entry(ha, &list->list, list) { 2203 if (*idx < cb->args[0]) 2204 goto skip; 2205 2206 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2207 portid, seq, 2208 RTM_NEWNEIGH, NTF_SELF); 2209 if (err < 0) 2210 return err; 2211 skip: 2212 *idx += 1; 2213 } 2214 return 0; 2215 } 2216 2217 /** 2218 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2219 * @nlh: netlink message header 2220 * @dev: netdevice 2221 * 2222 * Default netdevice operation to dump the existing unicast address list. 2223 * Returns zero on success. 2224 */ 2225 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2226 struct netlink_callback *cb, 2227 struct net_device *dev, 2228 int idx) 2229 { 2230 int err; 2231 2232 netif_addr_lock_bh(dev); 2233 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2234 if (err) 2235 goto out; 2236 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2237 out: 2238 netif_addr_unlock_bh(dev); 2239 return idx; 2240 } 2241 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2242 2243 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2244 { 2245 int idx = 0; 2246 struct net *net = sock_net(skb->sk); 2247 struct net_device *dev; 2248 2249 rcu_read_lock(); 2250 for_each_netdev_rcu(net, dev) { 2251 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2252 struct net_device *br_dev; 2253 const struct net_device_ops *ops; 2254 2255 br_dev = netdev_master_upper_dev_get(dev); 2256 ops = br_dev->netdev_ops; 2257 if (ops->ndo_fdb_dump) 2258 idx = ops->ndo_fdb_dump(skb, cb, dev, idx); 2259 } 2260 2261 if (dev->netdev_ops->ndo_fdb_dump) 2262 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx); 2263 } 2264 rcu_read_unlock(); 2265 2266 cb->args[0] = idx; 2267 return skb->len; 2268 } 2269 2270 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2271 struct net_device *dev, u16 mode) 2272 { 2273 struct nlmsghdr *nlh; 2274 struct ifinfomsg *ifm; 2275 struct nlattr *br_afspec; 2276 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2277 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2278 2279 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); 2280 if (nlh == NULL) 2281 return -EMSGSIZE; 2282 2283 ifm = nlmsg_data(nlh); 2284 ifm->ifi_family = AF_BRIDGE; 2285 ifm->__ifi_pad = 0; 2286 ifm->ifi_type = dev->type; 2287 ifm->ifi_index = dev->ifindex; 2288 ifm->ifi_flags = dev_get_flags(dev); 2289 ifm->ifi_change = 0; 2290 2291 2292 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2293 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2294 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2295 (br_dev && 2296 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2297 (dev->addr_len && 2298 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2299 (dev->ifindex != dev->iflink && 2300 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 2301 goto nla_put_failure; 2302 2303 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2304 if (!br_afspec) 2305 goto nla_put_failure; 2306 2307 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) || 2308 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2309 nla_nest_cancel(skb, br_afspec); 2310 goto nla_put_failure; 2311 } 2312 nla_nest_end(skb, br_afspec); 2313 2314 return nlmsg_end(skb, nlh); 2315 nla_put_failure: 2316 nlmsg_cancel(skb, nlh); 2317 return -EMSGSIZE; 2318 } 2319 EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2320 2321 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2322 { 2323 struct net *net = sock_net(skb->sk); 2324 struct net_device *dev; 2325 int idx = 0; 2326 u32 portid = NETLINK_CB(cb->skb).portid; 2327 u32 seq = cb->nlh->nlmsg_seq; 2328 struct nlattr *extfilt; 2329 u32 filter_mask = 0; 2330 2331 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct rtgenmsg), 2332 IFLA_EXT_MASK); 2333 if (extfilt) 2334 filter_mask = nla_get_u32(extfilt); 2335 2336 rcu_read_lock(); 2337 for_each_netdev_rcu(net, dev) { 2338 const struct net_device_ops *ops = dev->netdev_ops; 2339 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2340 2341 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2342 if (idx >= cb->args[0] && 2343 br_dev->netdev_ops->ndo_bridge_getlink( 2344 skb, portid, seq, dev, filter_mask) < 0) 2345 break; 2346 idx++; 2347 } 2348 2349 if (ops->ndo_bridge_getlink) { 2350 if (idx >= cb->args[0] && 2351 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2352 filter_mask) < 0) 2353 break; 2354 idx++; 2355 } 2356 } 2357 rcu_read_unlock(); 2358 cb->args[0] = idx; 2359 2360 return skb->len; 2361 } 2362 2363 static inline size_t bridge_nlmsg_size(void) 2364 { 2365 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2366 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 2367 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 2368 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 2369 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 2370 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 2371 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 2372 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 2373 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 2374 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 2375 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 2376 } 2377 2378 static int rtnl_bridge_notify(struct net_device *dev, u16 flags) 2379 { 2380 struct net *net = dev_net(dev); 2381 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2382 struct sk_buff *skb; 2383 int err = -EOPNOTSUPP; 2384 2385 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 2386 if (!skb) { 2387 err = -ENOMEM; 2388 goto errout; 2389 } 2390 2391 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) && 2392 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2393 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2394 if (err < 0) 2395 goto errout; 2396 } 2397 2398 if ((flags & BRIDGE_FLAGS_SELF) && 2399 dev->netdev_ops->ndo_bridge_getlink) { 2400 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2401 if (err < 0) 2402 goto errout; 2403 } 2404 2405 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 2406 return 0; 2407 errout: 2408 WARN_ON(err == -EMSGSIZE); 2409 kfree_skb(skb); 2410 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2411 return err; 2412 } 2413 2414 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, 2415 void *arg) 2416 { 2417 struct net *net = sock_net(skb->sk); 2418 struct ifinfomsg *ifm; 2419 struct net_device *dev; 2420 struct nlattr *br_spec, *attr = NULL; 2421 int rem, err = -EOPNOTSUPP; 2422 u16 oflags, flags = 0; 2423 bool have_flags = false; 2424 2425 if (nlmsg_len(nlh) < sizeof(*ifm)) 2426 return -EINVAL; 2427 2428 ifm = nlmsg_data(nlh); 2429 if (ifm->ifi_family != AF_BRIDGE) 2430 return -EPFNOSUPPORT; 2431 2432 dev = __dev_get_by_index(net, ifm->ifi_index); 2433 if (!dev) { 2434 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2435 return -ENODEV; 2436 } 2437 2438 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2439 if (br_spec) { 2440 nla_for_each_nested(attr, br_spec, rem) { 2441 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2442 have_flags = true; 2443 flags = nla_get_u16(attr); 2444 break; 2445 } 2446 } 2447 } 2448 2449 oflags = flags; 2450 2451 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2452 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2453 2454 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 2455 err = -EOPNOTSUPP; 2456 goto out; 2457 } 2458 2459 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2460 if (err) 2461 goto out; 2462 2463 flags &= ~BRIDGE_FLAGS_MASTER; 2464 } 2465 2466 if ((flags & BRIDGE_FLAGS_SELF)) { 2467 if (!dev->netdev_ops->ndo_bridge_setlink) 2468 err = -EOPNOTSUPP; 2469 else 2470 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2471 2472 if (!err) 2473 flags &= ~BRIDGE_FLAGS_SELF; 2474 } 2475 2476 if (have_flags) 2477 memcpy(nla_data(attr), &flags, sizeof(flags)); 2478 /* Generate event to notify upper layer of bridge change */ 2479 if (!err) 2480 err = rtnl_bridge_notify(dev, oflags); 2481 out: 2482 return err; 2483 } 2484 2485 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, 2486 void *arg) 2487 { 2488 struct net *net = sock_net(skb->sk); 2489 struct ifinfomsg *ifm; 2490 struct net_device *dev; 2491 struct nlattr *br_spec, *attr = NULL; 2492 int rem, err = -EOPNOTSUPP; 2493 u16 oflags, flags = 0; 2494 bool have_flags = false; 2495 2496 if (nlmsg_len(nlh) < sizeof(*ifm)) 2497 return -EINVAL; 2498 2499 ifm = nlmsg_data(nlh); 2500 if (ifm->ifi_family != AF_BRIDGE) 2501 return -EPFNOSUPPORT; 2502 2503 dev = __dev_get_by_index(net, ifm->ifi_index); 2504 if (!dev) { 2505 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2506 return -ENODEV; 2507 } 2508 2509 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2510 if (br_spec) { 2511 nla_for_each_nested(attr, br_spec, rem) { 2512 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2513 have_flags = true; 2514 flags = nla_get_u16(attr); 2515 break; 2516 } 2517 } 2518 } 2519 2520 oflags = flags; 2521 2522 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2523 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2524 2525 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 2526 err = -EOPNOTSUPP; 2527 goto out; 2528 } 2529 2530 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2531 if (err) 2532 goto out; 2533 2534 flags &= ~BRIDGE_FLAGS_MASTER; 2535 } 2536 2537 if ((flags & BRIDGE_FLAGS_SELF)) { 2538 if (!dev->netdev_ops->ndo_bridge_dellink) 2539 err = -EOPNOTSUPP; 2540 else 2541 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2542 2543 if (!err) 2544 flags &= ~BRIDGE_FLAGS_SELF; 2545 } 2546 2547 if (have_flags) 2548 memcpy(nla_data(attr), &flags, sizeof(flags)); 2549 /* Generate event to notify upper layer of bridge change */ 2550 if (!err) 2551 err = rtnl_bridge_notify(dev, oflags); 2552 out: 2553 return err; 2554 } 2555 2556 /* Protected by RTNL sempahore. */ 2557 static struct rtattr **rta_buf; 2558 static int rtattr_max; 2559 2560 /* Process one rtnetlink message. */ 2561 2562 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2563 { 2564 struct net *net = sock_net(skb->sk); 2565 rtnl_doit_func doit; 2566 int sz_idx, kind; 2567 int min_len; 2568 int family; 2569 int type; 2570 int err; 2571 2572 type = nlh->nlmsg_type; 2573 if (type > RTM_MAX) 2574 return -EOPNOTSUPP; 2575 2576 type -= RTM_BASE; 2577 2578 /* All the messages must have at least 1 byte length */ 2579 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 2580 return 0; 2581 2582 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 2583 sz_idx = type>>2; 2584 kind = type&3; 2585 2586 if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN)) 2587 return -EPERM; 2588 2589 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2590 struct sock *rtnl; 2591 rtnl_dumpit_func dumpit; 2592 rtnl_calcit_func calcit; 2593 u16 min_dump_alloc = 0; 2594 2595 dumpit = rtnl_get_dumpit(family, type); 2596 if (dumpit == NULL) 2597 return -EOPNOTSUPP; 2598 calcit = rtnl_get_calcit(family, type); 2599 if (calcit) 2600 min_dump_alloc = calcit(skb, nlh); 2601 2602 __rtnl_unlock(); 2603 rtnl = net->rtnl; 2604 { 2605 struct netlink_dump_control c = { 2606 .dump = dumpit, 2607 .min_dump_alloc = min_dump_alloc, 2608 }; 2609 err = netlink_dump_start(rtnl, skb, nlh, &c); 2610 } 2611 rtnl_lock(); 2612 return err; 2613 } 2614 2615 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 2616 2617 min_len = rtm_min[sz_idx]; 2618 if (nlh->nlmsg_len < min_len) 2619 return -EINVAL; 2620 2621 if (nlh->nlmsg_len > min_len) { 2622 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 2623 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 2624 2625 while (RTA_OK(attr, attrlen)) { 2626 unsigned int flavor = attr->rta_type & NLA_TYPE_MASK; 2627 if (flavor) { 2628 if (flavor > rta_max[sz_idx]) 2629 return -EINVAL; 2630 rta_buf[flavor-1] = attr; 2631 } 2632 attr = RTA_NEXT(attr, attrlen); 2633 } 2634 } 2635 2636 doit = rtnl_get_doit(family, type); 2637 if (doit == NULL) 2638 return -EOPNOTSUPP; 2639 2640 return doit(skb, nlh, (void *)&rta_buf[0]); 2641 } 2642 2643 static void rtnetlink_rcv(struct sk_buff *skb) 2644 { 2645 rtnl_lock(); 2646 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2647 rtnl_unlock(); 2648 } 2649 2650 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2651 { 2652 struct net_device *dev = ptr; 2653 2654 switch (event) { 2655 case NETDEV_UP: 2656 case NETDEV_DOWN: 2657 case NETDEV_PRE_UP: 2658 case NETDEV_POST_INIT: 2659 case NETDEV_REGISTER: 2660 case NETDEV_CHANGE: 2661 case NETDEV_PRE_TYPE_CHANGE: 2662 case NETDEV_GOING_DOWN: 2663 case NETDEV_UNREGISTER: 2664 case NETDEV_UNREGISTER_FINAL: 2665 case NETDEV_RELEASE: 2666 case NETDEV_JOIN: 2667 break; 2668 default: 2669 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2670 break; 2671 } 2672 return NOTIFY_DONE; 2673 } 2674 2675 static struct notifier_block rtnetlink_dev_notifier = { 2676 .notifier_call = rtnetlink_event, 2677 }; 2678 2679 2680 static int __net_init rtnetlink_net_init(struct net *net) 2681 { 2682 struct sock *sk; 2683 struct netlink_kernel_cfg cfg = { 2684 .groups = RTNLGRP_MAX, 2685 .input = rtnetlink_rcv, 2686 .cb_mutex = &rtnl_mutex, 2687 .flags = NL_CFG_F_NONROOT_RECV, 2688 }; 2689 2690 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 2691 if (!sk) 2692 return -ENOMEM; 2693 net->rtnl = sk; 2694 return 0; 2695 } 2696 2697 static void __net_exit rtnetlink_net_exit(struct net *net) 2698 { 2699 netlink_kernel_release(net->rtnl); 2700 net->rtnl = NULL; 2701 } 2702 2703 static struct pernet_operations rtnetlink_net_ops = { 2704 .init = rtnetlink_net_init, 2705 .exit = rtnetlink_net_exit, 2706 }; 2707 2708 void __init rtnetlink_init(void) 2709 { 2710 int i; 2711 2712 rtattr_max = 0; 2713 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 2714 if (rta_max[i] > rtattr_max) 2715 rtattr_max = rta_max[i]; 2716 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 2717 if (!rta_buf) 2718 panic("rtnetlink_init: cannot allocate rta_buf\n"); 2719 2720 if (register_pernet_subsys(&rtnetlink_net_ops)) 2721 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2722 2723 register_netdevice_notifier(&rtnetlink_dev_notifier); 2724 2725 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2726 rtnl_dump_ifinfo, rtnl_calcit); 2727 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2728 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2729 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2730 2731 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2732 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2733 2734 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 2735 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 2736 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 2737 2738 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 2739 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 2740 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 2741 } 2742 2743