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