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 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 519 { 520 struct sock *rtnl = net->rtnl; 521 int err = 0; 522 523 NETLINK_CB(skb).dst_group = group; 524 if (echo) 525 atomic_inc(&skb->users); 526 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 527 if (echo) 528 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 529 return err; 530 } 531 532 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 533 { 534 struct sock *rtnl = net->rtnl; 535 536 return nlmsg_unicast(rtnl, skb, pid); 537 } 538 EXPORT_SYMBOL(rtnl_unicast); 539 540 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 541 struct nlmsghdr *nlh, gfp_t flags) 542 { 543 struct sock *rtnl = net->rtnl; 544 int report = 0; 545 546 if (nlh) 547 report = nlmsg_report(nlh); 548 549 nlmsg_notify(rtnl, skb, pid, group, report, flags); 550 } 551 EXPORT_SYMBOL(rtnl_notify); 552 553 void rtnl_set_sk_err(struct net *net, u32 group, int error) 554 { 555 struct sock *rtnl = net->rtnl; 556 557 netlink_set_err(rtnl, 0, group, error); 558 } 559 EXPORT_SYMBOL(rtnl_set_sk_err); 560 561 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 562 { 563 struct nlattr *mx; 564 int i, valid = 0; 565 566 mx = nla_nest_start(skb, RTA_METRICS); 567 if (mx == NULL) 568 return -ENOBUFS; 569 570 for (i = 0; i < RTAX_MAX; i++) { 571 if (metrics[i]) { 572 valid++; 573 if (nla_put_u32(skb, i+1, metrics[i])) 574 goto nla_put_failure; 575 } 576 } 577 578 if (!valid) { 579 nla_nest_cancel(skb, mx); 580 return 0; 581 } 582 583 return nla_nest_end(skb, mx); 584 585 nla_put_failure: 586 nla_nest_cancel(skb, mx); 587 return -EMSGSIZE; 588 } 589 EXPORT_SYMBOL(rtnetlink_put_metrics); 590 591 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 592 long expires, u32 error) 593 { 594 struct rta_cacheinfo ci = { 595 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 596 .rta_used = dst->__use, 597 .rta_clntref = atomic_read(&(dst->__refcnt)), 598 .rta_error = error, 599 .rta_id = id, 600 }; 601 602 if (expires) { 603 unsigned long clock; 604 605 clock = jiffies_to_clock_t(abs(expires)); 606 clock = min_t(unsigned long, clock, INT_MAX); 607 ci.rta_expires = (expires > 0) ? clock : -clock; 608 } 609 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 610 } 611 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 612 613 static void set_operstate(struct net_device *dev, unsigned char transition) 614 { 615 unsigned char operstate = dev->operstate; 616 617 switch (transition) { 618 case IF_OPER_UP: 619 if ((operstate == IF_OPER_DORMANT || 620 operstate == IF_OPER_UNKNOWN) && 621 !netif_dormant(dev)) 622 operstate = IF_OPER_UP; 623 break; 624 625 case IF_OPER_DORMANT: 626 if (operstate == IF_OPER_UP || 627 operstate == IF_OPER_UNKNOWN) 628 operstate = IF_OPER_DORMANT; 629 break; 630 } 631 632 if (dev->operstate != operstate) { 633 write_lock_bh(&dev_base_lock); 634 dev->operstate = operstate; 635 write_unlock_bh(&dev_base_lock); 636 netdev_state_change(dev); 637 } 638 } 639 640 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 641 { 642 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 643 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 644 } 645 646 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 647 const struct ifinfomsg *ifm) 648 { 649 unsigned int flags = ifm->ifi_flags; 650 651 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 652 if (ifm->ifi_change) 653 flags = (flags & ifm->ifi_change) | 654 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 655 656 return flags; 657 } 658 659 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 660 const struct rtnl_link_stats64 *b) 661 { 662 a->rx_packets = b->rx_packets; 663 a->tx_packets = b->tx_packets; 664 a->rx_bytes = b->rx_bytes; 665 a->tx_bytes = b->tx_bytes; 666 a->rx_errors = b->rx_errors; 667 a->tx_errors = b->tx_errors; 668 a->rx_dropped = b->rx_dropped; 669 a->tx_dropped = b->tx_dropped; 670 671 a->multicast = b->multicast; 672 a->collisions = b->collisions; 673 674 a->rx_length_errors = b->rx_length_errors; 675 a->rx_over_errors = b->rx_over_errors; 676 a->rx_crc_errors = b->rx_crc_errors; 677 a->rx_frame_errors = b->rx_frame_errors; 678 a->rx_fifo_errors = b->rx_fifo_errors; 679 a->rx_missed_errors = b->rx_missed_errors; 680 681 a->tx_aborted_errors = b->tx_aborted_errors; 682 a->tx_carrier_errors = b->tx_carrier_errors; 683 a->tx_fifo_errors = b->tx_fifo_errors; 684 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 685 a->tx_window_errors = b->tx_window_errors; 686 687 a->rx_compressed = b->rx_compressed; 688 a->tx_compressed = b->tx_compressed; 689 } 690 691 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 692 { 693 memcpy(v, b, sizeof(*b)); 694 } 695 696 /* All VF info */ 697 static inline int rtnl_vfinfo_size(const struct net_device *dev, 698 u32 ext_filter_mask) 699 { 700 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 701 (ext_filter_mask & RTEXT_FILTER_VF)) { 702 int num_vfs = dev_num_vf(dev->dev.parent); 703 size_t size = nla_total_size(sizeof(struct nlattr)); 704 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 705 size += num_vfs * 706 (nla_total_size(sizeof(struct ifla_vf_mac)) + 707 nla_total_size(sizeof(struct ifla_vf_vlan)) + 708 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 709 nla_total_size(sizeof(struct ifla_vf_spoofchk))); 710 return size; 711 } else 712 return 0; 713 } 714 715 static size_t rtnl_port_size(const struct net_device *dev) 716 { 717 size_t port_size = nla_total_size(4) /* PORT_VF */ 718 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 719 + nla_total_size(sizeof(struct ifla_port_vsi)) 720 /* PORT_VSI_TYPE */ 721 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 722 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 723 + nla_total_size(1) /* PROT_VDP_REQUEST */ 724 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 725 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 726 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 727 + port_size; 728 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 729 + port_size; 730 731 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 732 return 0; 733 if (dev_num_vf(dev->dev.parent)) 734 return port_self_size + vf_ports_size + 735 vf_port_size * dev_num_vf(dev->dev.parent); 736 else 737 return port_self_size; 738 } 739 740 static noinline size_t if_nlmsg_size(const struct net_device *dev, 741 u32 ext_filter_mask) 742 { 743 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 744 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 745 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 746 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 747 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 748 + nla_total_size(sizeof(struct rtnl_link_stats)) 749 + nla_total_size(sizeof(struct rtnl_link_stats64)) 750 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 751 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 752 + nla_total_size(4) /* IFLA_TXQLEN */ 753 + nla_total_size(4) /* IFLA_WEIGHT */ 754 + nla_total_size(4) /* IFLA_MTU */ 755 + nla_total_size(4) /* IFLA_LINK */ 756 + nla_total_size(4) /* IFLA_MASTER */ 757 + nla_total_size(1) /* IFLA_CARRIER */ 758 + nla_total_size(4) /* IFLA_PROMISCUITY */ 759 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 760 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 761 + nla_total_size(1) /* IFLA_OPERSTATE */ 762 + nla_total_size(1) /* IFLA_LINKMODE */ 763 + nla_total_size(ext_filter_mask 764 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 765 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 766 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 767 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 768 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 769 } 770 771 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 772 { 773 struct nlattr *vf_ports; 774 struct nlattr *vf_port; 775 int vf; 776 int err; 777 778 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 779 if (!vf_ports) 780 return -EMSGSIZE; 781 782 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 783 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 784 if (!vf_port) 785 goto nla_put_failure; 786 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 787 goto nla_put_failure; 788 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 789 if (err == -EMSGSIZE) 790 goto nla_put_failure; 791 if (err) { 792 nla_nest_cancel(skb, vf_port); 793 continue; 794 } 795 nla_nest_end(skb, vf_port); 796 } 797 798 nla_nest_end(skb, vf_ports); 799 800 return 0; 801 802 nla_put_failure: 803 nla_nest_cancel(skb, vf_ports); 804 return -EMSGSIZE; 805 } 806 807 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 808 { 809 struct nlattr *port_self; 810 int err; 811 812 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 813 if (!port_self) 814 return -EMSGSIZE; 815 816 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 817 if (err) { 818 nla_nest_cancel(skb, port_self); 819 return (err == -EMSGSIZE) ? err : 0; 820 } 821 822 nla_nest_end(skb, port_self); 823 824 return 0; 825 } 826 827 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 828 { 829 int err; 830 831 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 832 return 0; 833 834 err = rtnl_port_self_fill(skb, dev); 835 if (err) 836 return err; 837 838 if (dev_num_vf(dev->dev.parent)) { 839 err = rtnl_vf_ports_fill(skb, dev); 840 if (err) 841 return err; 842 } 843 844 return 0; 845 } 846 847 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 848 int type, u32 pid, u32 seq, u32 change, 849 unsigned int flags, u32 ext_filter_mask) 850 { 851 struct ifinfomsg *ifm; 852 struct nlmsghdr *nlh; 853 struct rtnl_link_stats64 temp; 854 const struct rtnl_link_stats64 *stats; 855 struct nlattr *attr, *af_spec; 856 struct rtnl_af_ops *af_ops; 857 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 858 859 ASSERT_RTNL(); 860 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 861 if (nlh == NULL) 862 return -EMSGSIZE; 863 864 ifm = nlmsg_data(nlh); 865 ifm->ifi_family = AF_UNSPEC; 866 ifm->__ifi_pad = 0; 867 ifm->ifi_type = dev->type; 868 ifm->ifi_index = dev->ifindex; 869 ifm->ifi_flags = dev_get_flags(dev); 870 ifm->ifi_change = change; 871 872 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 873 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 874 nla_put_u8(skb, IFLA_OPERSTATE, 875 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 876 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 877 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 878 nla_put_u32(skb, IFLA_GROUP, dev->group) || 879 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 880 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 881 #ifdef CONFIG_RPS 882 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 883 #endif 884 (dev->ifindex != dev->iflink && 885 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 886 (upper_dev && 887 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 888 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 889 (dev->qdisc && 890 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 891 (dev->ifalias && 892 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias))) 893 goto nla_put_failure; 894 895 if (1) { 896 struct rtnl_link_ifmap map = { 897 .mem_start = dev->mem_start, 898 .mem_end = dev->mem_end, 899 .base_addr = dev->base_addr, 900 .irq = dev->irq, 901 .dma = dev->dma, 902 .port = dev->if_port, 903 }; 904 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 905 goto nla_put_failure; 906 } 907 908 if (dev->addr_len) { 909 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 910 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 911 goto nla_put_failure; 912 } 913 914 attr = nla_reserve(skb, IFLA_STATS, 915 sizeof(struct rtnl_link_stats)); 916 if (attr == NULL) 917 goto nla_put_failure; 918 919 stats = dev_get_stats(dev, &temp); 920 copy_rtnl_link_stats(nla_data(attr), stats); 921 922 attr = nla_reserve(skb, IFLA_STATS64, 923 sizeof(struct rtnl_link_stats64)); 924 if (attr == NULL) 925 goto nla_put_failure; 926 copy_rtnl_link_stats64(nla_data(attr), stats); 927 928 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 929 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 930 goto nla_put_failure; 931 932 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 933 && (ext_filter_mask & RTEXT_FILTER_VF)) { 934 int i; 935 936 struct nlattr *vfinfo, *vf; 937 int num_vfs = dev_num_vf(dev->dev.parent); 938 939 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 940 if (!vfinfo) 941 goto nla_put_failure; 942 for (i = 0; i < num_vfs; i++) { 943 struct ifla_vf_info ivi; 944 struct ifla_vf_mac vf_mac; 945 struct ifla_vf_vlan vf_vlan; 946 struct ifla_vf_tx_rate vf_tx_rate; 947 struct ifla_vf_spoofchk vf_spoofchk; 948 949 /* 950 * Not all SR-IOV capable drivers support the 951 * spoofcheck query. Preset to -1 so the user 952 * space tool can detect that the driver didn't 953 * report anything. 954 */ 955 ivi.spoofchk = -1; 956 memset(ivi.mac, 0, sizeof(ivi.mac)); 957 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 958 break; 959 vf_mac.vf = 960 vf_vlan.vf = 961 vf_tx_rate.vf = 962 vf_spoofchk.vf = ivi.vf; 963 964 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 965 vf_vlan.vlan = ivi.vlan; 966 vf_vlan.qos = ivi.qos; 967 vf_tx_rate.rate = ivi.tx_rate; 968 vf_spoofchk.setting = ivi.spoofchk; 969 vf = nla_nest_start(skb, IFLA_VF_INFO); 970 if (!vf) { 971 nla_nest_cancel(skb, vfinfo); 972 goto nla_put_failure; 973 } 974 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 975 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 976 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 977 &vf_tx_rate) || 978 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 979 &vf_spoofchk)) 980 goto nla_put_failure; 981 nla_nest_end(skb, vf); 982 } 983 nla_nest_end(skb, vfinfo); 984 } 985 986 if (rtnl_port_fill(skb, dev)) 987 goto nla_put_failure; 988 989 if (dev->rtnl_link_ops) { 990 if (rtnl_link_fill(skb, dev) < 0) 991 goto nla_put_failure; 992 } 993 994 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 995 goto nla_put_failure; 996 997 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 998 if (af_ops->fill_link_af) { 999 struct nlattr *af; 1000 int err; 1001 1002 if (!(af = nla_nest_start(skb, af_ops->family))) 1003 goto nla_put_failure; 1004 1005 err = af_ops->fill_link_af(skb, dev); 1006 1007 /* 1008 * Caller may return ENODATA to indicate that there 1009 * was no data to be dumped. This is not an error, it 1010 * means we should trim the attribute header and 1011 * continue. 1012 */ 1013 if (err == -ENODATA) 1014 nla_nest_cancel(skb, af); 1015 else if (err < 0) 1016 goto nla_put_failure; 1017 1018 nla_nest_end(skb, af); 1019 } 1020 } 1021 1022 nla_nest_end(skb, af_spec); 1023 1024 return nlmsg_end(skb, nlh); 1025 1026 nla_put_failure: 1027 nlmsg_cancel(skb, nlh); 1028 return -EMSGSIZE; 1029 } 1030 1031 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1032 { 1033 struct net *net = sock_net(skb->sk); 1034 int h, s_h; 1035 int idx = 0, s_idx; 1036 struct net_device *dev; 1037 struct hlist_head *head; 1038 struct nlattr *tb[IFLA_MAX+1]; 1039 u32 ext_filter_mask = 0; 1040 1041 s_h = cb->args[0]; 1042 s_idx = cb->args[1]; 1043 1044 rcu_read_lock(); 1045 cb->seq = net->dev_base_seq; 1046 1047 if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1048 ifla_policy) >= 0) { 1049 1050 if (tb[IFLA_EXT_MASK]) 1051 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1052 } 1053 1054 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1055 idx = 0; 1056 head = &net->dev_index_head[h]; 1057 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1058 if (idx < s_idx) 1059 goto cont; 1060 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1061 NETLINK_CB(cb->skb).portid, 1062 cb->nlh->nlmsg_seq, 0, 1063 NLM_F_MULTI, 1064 ext_filter_mask) <= 0) 1065 goto out; 1066 1067 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1068 cont: 1069 idx++; 1070 } 1071 } 1072 out: 1073 rcu_read_unlock(); 1074 cb->args[1] = idx; 1075 cb->args[0] = h; 1076 1077 return skb->len; 1078 } 1079 1080 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1081 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1082 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1083 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1084 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1085 [IFLA_MTU] = { .type = NLA_U32 }, 1086 [IFLA_LINK] = { .type = NLA_U32 }, 1087 [IFLA_MASTER] = { .type = NLA_U32 }, 1088 [IFLA_CARRIER] = { .type = NLA_U8 }, 1089 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1090 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1091 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1092 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1093 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1094 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1095 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1096 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1097 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1098 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1099 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1100 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1101 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1102 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1103 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1104 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1105 }; 1106 EXPORT_SYMBOL(ifla_policy); 1107 1108 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1109 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1110 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1111 }; 1112 1113 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1114 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1115 }; 1116 1117 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1118 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1119 .len = sizeof(struct ifla_vf_mac) }, 1120 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1121 .len = sizeof(struct ifla_vf_vlan) }, 1122 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1123 .len = sizeof(struct ifla_vf_tx_rate) }, 1124 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1125 .len = sizeof(struct ifla_vf_spoofchk) }, 1126 }; 1127 1128 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1129 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1130 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1131 .len = PORT_PROFILE_MAX }, 1132 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1133 .len = sizeof(struct ifla_port_vsi)}, 1134 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1135 .len = PORT_UUID_MAX }, 1136 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1137 .len = PORT_UUID_MAX }, 1138 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1139 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1140 }; 1141 1142 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1143 { 1144 struct net *net; 1145 /* Examine the link attributes and figure out which 1146 * network namespace we are talking about. 1147 */ 1148 if (tb[IFLA_NET_NS_PID]) 1149 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1150 else if (tb[IFLA_NET_NS_FD]) 1151 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1152 else 1153 net = get_net(src_net); 1154 return net; 1155 } 1156 EXPORT_SYMBOL(rtnl_link_get_net); 1157 1158 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1159 { 1160 if (dev) { 1161 if (tb[IFLA_ADDRESS] && 1162 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1163 return -EINVAL; 1164 1165 if (tb[IFLA_BROADCAST] && 1166 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1167 return -EINVAL; 1168 } 1169 1170 if (tb[IFLA_AF_SPEC]) { 1171 struct nlattr *af; 1172 int rem, err; 1173 1174 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1175 const struct rtnl_af_ops *af_ops; 1176 1177 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1178 return -EAFNOSUPPORT; 1179 1180 if (!af_ops->set_link_af) 1181 return -EOPNOTSUPP; 1182 1183 if (af_ops->validate_link_af) { 1184 err = af_ops->validate_link_af(dev, af); 1185 if (err < 0) 1186 return err; 1187 } 1188 } 1189 } 1190 1191 return 0; 1192 } 1193 1194 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1195 { 1196 int rem, err = -EINVAL; 1197 struct nlattr *vf; 1198 const struct net_device_ops *ops = dev->netdev_ops; 1199 1200 nla_for_each_nested(vf, attr, rem) { 1201 switch (nla_type(vf)) { 1202 case IFLA_VF_MAC: { 1203 struct ifla_vf_mac *ivm; 1204 ivm = nla_data(vf); 1205 err = -EOPNOTSUPP; 1206 if (ops->ndo_set_vf_mac) 1207 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1208 ivm->mac); 1209 break; 1210 } 1211 case IFLA_VF_VLAN: { 1212 struct ifla_vf_vlan *ivv; 1213 ivv = nla_data(vf); 1214 err = -EOPNOTSUPP; 1215 if (ops->ndo_set_vf_vlan) 1216 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1217 ivv->vlan, 1218 ivv->qos); 1219 break; 1220 } 1221 case IFLA_VF_TX_RATE: { 1222 struct ifla_vf_tx_rate *ivt; 1223 ivt = nla_data(vf); 1224 err = -EOPNOTSUPP; 1225 if (ops->ndo_set_vf_tx_rate) 1226 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1227 ivt->rate); 1228 break; 1229 } 1230 case IFLA_VF_SPOOFCHK: { 1231 struct ifla_vf_spoofchk *ivs; 1232 ivs = nla_data(vf); 1233 err = -EOPNOTSUPP; 1234 if (ops->ndo_set_vf_spoofchk) 1235 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1236 ivs->setting); 1237 break; 1238 } 1239 default: 1240 err = -EINVAL; 1241 break; 1242 } 1243 if (err) 1244 break; 1245 } 1246 return err; 1247 } 1248 1249 static int do_set_master(struct net_device *dev, int ifindex) 1250 { 1251 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1252 const struct net_device_ops *ops; 1253 int err; 1254 1255 if (upper_dev) { 1256 if (upper_dev->ifindex == ifindex) 1257 return 0; 1258 ops = upper_dev->netdev_ops; 1259 if (ops->ndo_del_slave) { 1260 err = ops->ndo_del_slave(upper_dev, dev); 1261 if (err) 1262 return err; 1263 } else { 1264 return -EOPNOTSUPP; 1265 } 1266 } 1267 1268 if (ifindex) { 1269 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1270 if (!upper_dev) 1271 return -EINVAL; 1272 ops = upper_dev->netdev_ops; 1273 if (ops->ndo_add_slave) { 1274 err = ops->ndo_add_slave(upper_dev, dev); 1275 if (err) 1276 return err; 1277 } else { 1278 return -EOPNOTSUPP; 1279 } 1280 } 1281 return 0; 1282 } 1283 1284 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1285 struct nlattr **tb, char *ifname, int modified) 1286 { 1287 const struct net_device_ops *ops = dev->netdev_ops; 1288 int err; 1289 1290 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1291 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1292 if (IS_ERR(net)) { 1293 err = PTR_ERR(net); 1294 goto errout; 1295 } 1296 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) { 1297 err = -EPERM; 1298 goto errout; 1299 } 1300 err = dev_change_net_namespace(dev, net, ifname); 1301 put_net(net); 1302 if (err) 1303 goto errout; 1304 modified = 1; 1305 } 1306 1307 if (tb[IFLA_MAP]) { 1308 struct rtnl_link_ifmap *u_map; 1309 struct ifmap k_map; 1310 1311 if (!ops->ndo_set_config) { 1312 err = -EOPNOTSUPP; 1313 goto errout; 1314 } 1315 1316 if (!netif_device_present(dev)) { 1317 err = -ENODEV; 1318 goto errout; 1319 } 1320 1321 u_map = nla_data(tb[IFLA_MAP]); 1322 k_map.mem_start = (unsigned long) u_map->mem_start; 1323 k_map.mem_end = (unsigned long) u_map->mem_end; 1324 k_map.base_addr = (unsigned short) u_map->base_addr; 1325 k_map.irq = (unsigned char) u_map->irq; 1326 k_map.dma = (unsigned char) u_map->dma; 1327 k_map.port = (unsigned char) u_map->port; 1328 1329 err = ops->ndo_set_config(dev, &k_map); 1330 if (err < 0) 1331 goto errout; 1332 1333 modified = 1; 1334 } 1335 1336 if (tb[IFLA_ADDRESS]) { 1337 struct sockaddr *sa; 1338 int len; 1339 1340 len = sizeof(sa_family_t) + dev->addr_len; 1341 sa = kmalloc(len, GFP_KERNEL); 1342 if (!sa) { 1343 err = -ENOMEM; 1344 goto errout; 1345 } 1346 sa->sa_family = dev->type; 1347 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1348 dev->addr_len); 1349 err = dev_set_mac_address(dev, sa); 1350 kfree(sa); 1351 if (err) 1352 goto errout; 1353 modified = 1; 1354 } 1355 1356 if (tb[IFLA_MTU]) { 1357 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1358 if (err < 0) 1359 goto errout; 1360 modified = 1; 1361 } 1362 1363 if (tb[IFLA_GROUP]) { 1364 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1365 modified = 1; 1366 } 1367 1368 /* 1369 * Interface selected by interface index but interface 1370 * name provided implies that a name change has been 1371 * requested. 1372 */ 1373 if (ifm->ifi_index > 0 && ifname[0]) { 1374 err = dev_change_name(dev, ifname); 1375 if (err < 0) 1376 goto errout; 1377 modified = 1; 1378 } 1379 1380 if (tb[IFLA_IFALIAS]) { 1381 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1382 nla_len(tb[IFLA_IFALIAS])); 1383 if (err < 0) 1384 goto errout; 1385 modified = 1; 1386 } 1387 1388 if (tb[IFLA_BROADCAST]) { 1389 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1390 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1391 } 1392 1393 if (ifm->ifi_flags || ifm->ifi_change) { 1394 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1395 if (err < 0) 1396 goto errout; 1397 } 1398 1399 if (tb[IFLA_MASTER]) { 1400 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1401 if (err) 1402 goto errout; 1403 modified = 1; 1404 } 1405 1406 if (tb[IFLA_CARRIER]) { 1407 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1408 if (err) 1409 goto errout; 1410 modified = 1; 1411 } 1412 1413 if (tb[IFLA_TXQLEN]) 1414 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1415 1416 if (tb[IFLA_OPERSTATE]) 1417 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1418 1419 if (tb[IFLA_LINKMODE]) { 1420 write_lock_bh(&dev_base_lock); 1421 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1422 write_unlock_bh(&dev_base_lock); 1423 } 1424 1425 if (tb[IFLA_VFINFO_LIST]) { 1426 struct nlattr *attr; 1427 int rem; 1428 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1429 if (nla_type(attr) != IFLA_VF_INFO) { 1430 err = -EINVAL; 1431 goto errout; 1432 } 1433 err = do_setvfinfo(dev, attr); 1434 if (err < 0) 1435 goto errout; 1436 modified = 1; 1437 } 1438 } 1439 err = 0; 1440 1441 if (tb[IFLA_VF_PORTS]) { 1442 struct nlattr *port[IFLA_PORT_MAX+1]; 1443 struct nlattr *attr; 1444 int vf; 1445 int rem; 1446 1447 err = -EOPNOTSUPP; 1448 if (!ops->ndo_set_vf_port) 1449 goto errout; 1450 1451 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1452 if (nla_type(attr) != IFLA_VF_PORT) 1453 continue; 1454 err = nla_parse_nested(port, IFLA_PORT_MAX, 1455 attr, ifla_port_policy); 1456 if (err < 0) 1457 goto errout; 1458 if (!port[IFLA_PORT_VF]) { 1459 err = -EOPNOTSUPP; 1460 goto errout; 1461 } 1462 vf = nla_get_u32(port[IFLA_PORT_VF]); 1463 err = ops->ndo_set_vf_port(dev, vf, port); 1464 if (err < 0) 1465 goto errout; 1466 modified = 1; 1467 } 1468 } 1469 err = 0; 1470 1471 if (tb[IFLA_PORT_SELF]) { 1472 struct nlattr *port[IFLA_PORT_MAX+1]; 1473 1474 err = nla_parse_nested(port, IFLA_PORT_MAX, 1475 tb[IFLA_PORT_SELF], ifla_port_policy); 1476 if (err < 0) 1477 goto errout; 1478 1479 err = -EOPNOTSUPP; 1480 if (ops->ndo_set_vf_port) 1481 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1482 if (err < 0) 1483 goto errout; 1484 modified = 1; 1485 } 1486 1487 if (tb[IFLA_AF_SPEC]) { 1488 struct nlattr *af; 1489 int rem; 1490 1491 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1492 const struct rtnl_af_ops *af_ops; 1493 1494 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1495 BUG(); 1496 1497 err = af_ops->set_link_af(dev, af); 1498 if (err < 0) 1499 goto errout; 1500 1501 modified = 1; 1502 } 1503 } 1504 err = 0; 1505 1506 errout: 1507 if (err < 0 && modified) 1508 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", 1509 dev->name); 1510 1511 return err; 1512 } 1513 1514 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1515 { 1516 struct net *net = sock_net(skb->sk); 1517 struct ifinfomsg *ifm; 1518 struct net_device *dev; 1519 int err; 1520 struct nlattr *tb[IFLA_MAX+1]; 1521 char ifname[IFNAMSIZ]; 1522 1523 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1524 if (err < 0) 1525 goto errout; 1526 1527 if (tb[IFLA_IFNAME]) 1528 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1529 else 1530 ifname[0] = '\0'; 1531 1532 err = -EINVAL; 1533 ifm = nlmsg_data(nlh); 1534 if (ifm->ifi_index > 0) 1535 dev = __dev_get_by_index(net, ifm->ifi_index); 1536 else if (tb[IFLA_IFNAME]) 1537 dev = __dev_get_by_name(net, ifname); 1538 else 1539 goto errout; 1540 1541 if (dev == NULL) { 1542 err = -ENODEV; 1543 goto errout; 1544 } 1545 1546 err = validate_linkmsg(dev, tb); 1547 if (err < 0) 1548 goto errout; 1549 1550 err = do_setlink(dev, ifm, tb, ifname, 0); 1551 errout: 1552 return err; 1553 } 1554 1555 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1556 { 1557 struct net *net = sock_net(skb->sk); 1558 const struct rtnl_link_ops *ops; 1559 struct net_device *dev; 1560 struct ifinfomsg *ifm; 1561 char ifname[IFNAMSIZ]; 1562 struct nlattr *tb[IFLA_MAX+1]; 1563 int err; 1564 LIST_HEAD(list_kill); 1565 1566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1567 if (err < 0) 1568 return err; 1569 1570 if (tb[IFLA_IFNAME]) 1571 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1572 1573 ifm = nlmsg_data(nlh); 1574 if (ifm->ifi_index > 0) 1575 dev = __dev_get_by_index(net, ifm->ifi_index); 1576 else if (tb[IFLA_IFNAME]) 1577 dev = __dev_get_by_name(net, ifname); 1578 else 1579 return -EINVAL; 1580 1581 if (!dev) 1582 return -ENODEV; 1583 1584 ops = dev->rtnl_link_ops; 1585 if (!ops) 1586 return -EOPNOTSUPP; 1587 1588 ops->dellink(dev, &list_kill); 1589 unregister_netdevice_many(&list_kill); 1590 list_del(&list_kill); 1591 return 0; 1592 } 1593 1594 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1595 { 1596 unsigned int old_flags; 1597 int err; 1598 1599 old_flags = dev->flags; 1600 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1601 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1602 if (err < 0) 1603 return err; 1604 } 1605 1606 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1607 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1608 1609 __dev_notify_flags(dev, old_flags); 1610 return 0; 1611 } 1612 EXPORT_SYMBOL(rtnl_configure_link); 1613 1614 struct net_device *rtnl_create_link(struct net *net, 1615 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1616 { 1617 int err; 1618 struct net_device *dev; 1619 unsigned int num_tx_queues = 1; 1620 unsigned int num_rx_queues = 1; 1621 1622 if (tb[IFLA_NUM_TX_QUEUES]) 1623 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1624 else if (ops->get_num_tx_queues) 1625 num_tx_queues = ops->get_num_tx_queues(); 1626 1627 if (tb[IFLA_NUM_RX_QUEUES]) 1628 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1629 else if (ops->get_num_rx_queues) 1630 num_rx_queues = ops->get_num_rx_queues(); 1631 1632 err = -ENOMEM; 1633 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup, 1634 num_tx_queues, num_rx_queues); 1635 if (!dev) 1636 goto err; 1637 1638 dev_net_set(dev, net); 1639 dev->rtnl_link_ops = ops; 1640 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1641 1642 if (tb[IFLA_MTU]) 1643 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1644 if (tb[IFLA_ADDRESS]) { 1645 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1646 nla_len(tb[IFLA_ADDRESS])); 1647 dev->addr_assign_type = NET_ADDR_SET; 1648 } 1649 if (tb[IFLA_BROADCAST]) 1650 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1651 nla_len(tb[IFLA_BROADCAST])); 1652 if (tb[IFLA_TXQLEN]) 1653 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1654 if (tb[IFLA_OPERSTATE]) 1655 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1656 if (tb[IFLA_LINKMODE]) 1657 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1658 if (tb[IFLA_GROUP]) 1659 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1660 1661 return dev; 1662 1663 err: 1664 return ERR_PTR(err); 1665 } 1666 EXPORT_SYMBOL(rtnl_create_link); 1667 1668 static int rtnl_group_changelink(struct net *net, int group, 1669 struct ifinfomsg *ifm, 1670 struct nlattr **tb) 1671 { 1672 struct net_device *dev; 1673 int err; 1674 1675 for_each_netdev(net, dev) { 1676 if (dev->group == group) { 1677 err = do_setlink(dev, ifm, tb, NULL, 0); 1678 if (err < 0) 1679 return err; 1680 } 1681 } 1682 1683 return 0; 1684 } 1685 1686 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1687 { 1688 struct net *net = sock_net(skb->sk); 1689 const struct rtnl_link_ops *ops; 1690 struct net_device *dev; 1691 struct ifinfomsg *ifm; 1692 char kind[MODULE_NAME_LEN]; 1693 char ifname[IFNAMSIZ]; 1694 struct nlattr *tb[IFLA_MAX+1]; 1695 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1696 int err; 1697 1698 #ifdef CONFIG_MODULES 1699 replay: 1700 #endif 1701 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1702 if (err < 0) 1703 return err; 1704 1705 if (tb[IFLA_IFNAME]) 1706 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1707 else 1708 ifname[0] = '\0'; 1709 1710 ifm = nlmsg_data(nlh); 1711 if (ifm->ifi_index > 0) 1712 dev = __dev_get_by_index(net, ifm->ifi_index); 1713 else { 1714 if (ifname[0]) 1715 dev = __dev_get_by_name(net, ifname); 1716 else 1717 dev = NULL; 1718 } 1719 1720 err = validate_linkmsg(dev, tb); 1721 if (err < 0) 1722 return err; 1723 1724 if (tb[IFLA_LINKINFO]) { 1725 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1726 tb[IFLA_LINKINFO], ifla_info_policy); 1727 if (err < 0) 1728 return err; 1729 } else 1730 memset(linkinfo, 0, sizeof(linkinfo)); 1731 1732 if (linkinfo[IFLA_INFO_KIND]) { 1733 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1734 ops = rtnl_link_ops_get(kind); 1735 } else { 1736 kind[0] = '\0'; 1737 ops = NULL; 1738 } 1739 1740 if (1) { 1741 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1742 struct net *dest_net; 1743 1744 if (ops) { 1745 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1746 err = nla_parse_nested(attr, ops->maxtype, 1747 linkinfo[IFLA_INFO_DATA], 1748 ops->policy); 1749 if (err < 0) 1750 return err; 1751 data = attr; 1752 } 1753 if (ops->validate) { 1754 err = ops->validate(tb, data); 1755 if (err < 0) 1756 return err; 1757 } 1758 } 1759 1760 if (dev) { 1761 int modified = 0; 1762 1763 if (nlh->nlmsg_flags & NLM_F_EXCL) 1764 return -EEXIST; 1765 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1766 return -EOPNOTSUPP; 1767 1768 if (linkinfo[IFLA_INFO_DATA]) { 1769 if (!ops || ops != dev->rtnl_link_ops || 1770 !ops->changelink) 1771 return -EOPNOTSUPP; 1772 1773 err = ops->changelink(dev, tb, data); 1774 if (err < 0) 1775 return err; 1776 modified = 1; 1777 } 1778 1779 return do_setlink(dev, ifm, tb, ifname, modified); 1780 } 1781 1782 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1783 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1784 return rtnl_group_changelink(net, 1785 nla_get_u32(tb[IFLA_GROUP]), 1786 ifm, tb); 1787 return -ENODEV; 1788 } 1789 1790 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1791 return -EOPNOTSUPP; 1792 1793 if (!ops) { 1794 #ifdef CONFIG_MODULES 1795 if (kind[0]) { 1796 __rtnl_unlock(); 1797 request_module("rtnl-link-%s", kind); 1798 rtnl_lock(); 1799 ops = rtnl_link_ops_get(kind); 1800 if (ops) 1801 goto replay; 1802 } 1803 #endif 1804 return -EOPNOTSUPP; 1805 } 1806 1807 if (!ifname[0]) 1808 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1809 1810 dest_net = rtnl_link_get_net(net, tb); 1811 if (IS_ERR(dest_net)) 1812 return PTR_ERR(dest_net); 1813 1814 dev = rtnl_create_link(dest_net, ifname, ops, tb); 1815 if (IS_ERR(dev)) { 1816 err = PTR_ERR(dev); 1817 goto out; 1818 } 1819 1820 dev->ifindex = ifm->ifi_index; 1821 1822 if (ops->newlink) 1823 err = ops->newlink(net, dev, tb, data); 1824 else 1825 err = register_netdevice(dev); 1826 1827 if (err < 0 && !IS_ERR(dev)) 1828 free_netdev(dev); 1829 if (err < 0) 1830 goto out; 1831 1832 err = rtnl_configure_link(dev, ifm); 1833 if (err < 0) 1834 unregister_netdevice(dev); 1835 out: 1836 put_net(dest_net); 1837 return err; 1838 } 1839 } 1840 1841 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 1842 { 1843 struct net *net = sock_net(skb->sk); 1844 struct ifinfomsg *ifm; 1845 char ifname[IFNAMSIZ]; 1846 struct nlattr *tb[IFLA_MAX+1]; 1847 struct net_device *dev = NULL; 1848 struct sk_buff *nskb; 1849 int err; 1850 u32 ext_filter_mask = 0; 1851 1852 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1853 if (err < 0) 1854 return err; 1855 1856 if (tb[IFLA_IFNAME]) 1857 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1858 1859 if (tb[IFLA_EXT_MASK]) 1860 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1861 1862 ifm = nlmsg_data(nlh); 1863 if (ifm->ifi_index > 0) 1864 dev = __dev_get_by_index(net, ifm->ifi_index); 1865 else if (tb[IFLA_IFNAME]) 1866 dev = __dev_get_by_name(net, ifname); 1867 else 1868 return -EINVAL; 1869 1870 if (dev == NULL) 1871 return -ENODEV; 1872 1873 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1874 if (nskb == NULL) 1875 return -ENOBUFS; 1876 1877 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 1878 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1879 if (err < 0) { 1880 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1881 WARN_ON(err == -EMSGSIZE); 1882 kfree_skb(nskb); 1883 } else 1884 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 1885 1886 return err; 1887 } 1888 1889 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1890 { 1891 struct net *net = sock_net(skb->sk); 1892 struct net_device *dev; 1893 struct nlattr *tb[IFLA_MAX+1]; 1894 u32 ext_filter_mask = 0; 1895 u16 min_ifinfo_dump_size = 0; 1896 1897 if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1898 ifla_policy) >= 0) { 1899 if (tb[IFLA_EXT_MASK]) 1900 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1901 } 1902 1903 if (!ext_filter_mask) 1904 return NLMSG_GOODSIZE; 1905 /* 1906 * traverse the list of net devices and compute the minimum 1907 * buffer size based upon the filter mask. 1908 */ 1909 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1910 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1911 if_nlmsg_size(dev, 1912 ext_filter_mask)); 1913 } 1914 1915 return min_ifinfo_dump_size; 1916 } 1917 1918 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1919 { 1920 int idx; 1921 int s_idx = cb->family; 1922 1923 if (s_idx == 0) 1924 s_idx = 1; 1925 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1926 int type = cb->nlh->nlmsg_type-RTM_BASE; 1927 if (idx < s_idx || idx == PF_PACKET) 1928 continue; 1929 if (rtnl_msg_handlers[idx] == NULL || 1930 rtnl_msg_handlers[idx][type].dumpit == NULL) 1931 continue; 1932 if (idx > s_idx) 1933 memset(&cb->args[0], 0, sizeof(cb->args)); 1934 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1935 break; 1936 } 1937 cb->family = idx; 1938 1939 return skb->len; 1940 } 1941 1942 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change) 1943 { 1944 struct net *net = dev_net(dev); 1945 struct sk_buff *skb; 1946 int err = -ENOBUFS; 1947 size_t if_info_size; 1948 1949 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL); 1950 if (skb == NULL) 1951 goto errout; 1952 1953 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 1954 if (err < 0) { 1955 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1956 WARN_ON(err == -EMSGSIZE); 1957 kfree_skb(skb); 1958 goto errout; 1959 } 1960 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1961 return; 1962 errout: 1963 if (err < 0) 1964 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1965 } 1966 EXPORT_SYMBOL(rtmsg_ifinfo); 1967 1968 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 1969 struct net_device *dev, 1970 u8 *addr, u32 pid, u32 seq, 1971 int type, unsigned int flags) 1972 { 1973 struct nlmsghdr *nlh; 1974 struct ndmsg *ndm; 1975 1976 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI); 1977 if (!nlh) 1978 return -EMSGSIZE; 1979 1980 ndm = nlmsg_data(nlh); 1981 ndm->ndm_family = AF_BRIDGE; 1982 ndm->ndm_pad1 = 0; 1983 ndm->ndm_pad2 = 0; 1984 ndm->ndm_flags = flags; 1985 ndm->ndm_type = 0; 1986 ndm->ndm_ifindex = dev->ifindex; 1987 ndm->ndm_state = NUD_PERMANENT; 1988 1989 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 1990 goto nla_put_failure; 1991 1992 return nlmsg_end(skb, nlh); 1993 1994 nla_put_failure: 1995 nlmsg_cancel(skb, nlh); 1996 return -EMSGSIZE; 1997 } 1998 1999 static inline size_t rtnl_fdb_nlmsg_size(void) 2000 { 2001 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2002 } 2003 2004 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2005 { 2006 struct net *net = dev_net(dev); 2007 struct sk_buff *skb; 2008 int err = -ENOBUFS; 2009 2010 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2011 if (!skb) 2012 goto errout; 2013 2014 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF); 2015 if (err < 0) { 2016 kfree_skb(skb); 2017 goto errout; 2018 } 2019 2020 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2021 return; 2022 errout: 2023 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2024 } 2025 2026 /** 2027 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2028 */ 2029 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2030 struct nlattr *tb[], 2031 struct net_device *dev, 2032 const unsigned char *addr, 2033 u16 flags) 2034 { 2035 int err = -EINVAL; 2036 2037 /* If aging addresses are supported device will need to 2038 * implement its own handler for this. 2039 */ 2040 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2041 pr_info("%s: FDB only supports static addresses\n", dev->name); 2042 return err; 2043 } 2044 2045 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2046 err = dev_uc_add_excl(dev, addr); 2047 else if (is_multicast_ether_addr(addr)) 2048 err = dev_mc_add_excl(dev, addr); 2049 2050 /* Only return duplicate errors if NLM_F_EXCL is set */ 2051 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2052 err = 0; 2053 2054 return err; 2055 } 2056 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2057 2058 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2059 { 2060 struct net *net = sock_net(skb->sk); 2061 struct ndmsg *ndm; 2062 struct nlattr *tb[NDA_MAX+1]; 2063 struct net_device *dev; 2064 u8 *addr; 2065 int err; 2066 2067 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2068 if (err < 0) 2069 return err; 2070 2071 ndm = nlmsg_data(nlh); 2072 if (ndm->ndm_ifindex == 0) { 2073 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2074 return -EINVAL; 2075 } 2076 2077 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2078 if (dev == NULL) { 2079 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2080 return -ENODEV; 2081 } 2082 2083 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2084 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2085 return -EINVAL; 2086 } 2087 2088 addr = nla_data(tb[NDA_LLADDR]); 2089 if (is_zero_ether_addr(addr)) { 2090 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n"); 2091 return -EINVAL; 2092 } 2093 2094 err = -EOPNOTSUPP; 2095 2096 /* Support fdb on master device the net/bridge default case */ 2097 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2098 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2099 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2100 const struct net_device_ops *ops = br_dev->netdev_ops; 2101 2102 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags); 2103 if (err) 2104 goto out; 2105 else 2106 ndm->ndm_flags &= ~NTF_MASTER; 2107 } 2108 2109 /* Embedded bridge, macvlan, and any other device support */ 2110 if ((ndm->ndm_flags & NTF_SELF)) { 2111 if (dev->netdev_ops->ndo_fdb_add) 2112 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2113 nlh->nlmsg_flags); 2114 else 2115 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, 2116 nlh->nlmsg_flags); 2117 2118 if (!err) { 2119 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2120 ndm->ndm_flags &= ~NTF_SELF; 2121 } 2122 } 2123 out: 2124 return err; 2125 } 2126 2127 /** 2128 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2129 */ 2130 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2131 struct nlattr *tb[], 2132 struct net_device *dev, 2133 const unsigned char *addr) 2134 { 2135 int err = -EOPNOTSUPP; 2136 2137 /* If aging addresses are supported device will need to 2138 * implement its own handler for this. 2139 */ 2140 if (ndm->ndm_state & NUD_PERMANENT) { 2141 pr_info("%s: FDB only supports static addresses\n", dev->name); 2142 return -EINVAL; 2143 } 2144 2145 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2146 err = dev_uc_del(dev, addr); 2147 else if (is_multicast_ether_addr(addr)) 2148 err = dev_mc_del(dev, addr); 2149 else 2150 err = -EINVAL; 2151 2152 return err; 2153 } 2154 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2155 2156 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2157 { 2158 struct net *net = sock_net(skb->sk); 2159 struct ndmsg *ndm; 2160 struct nlattr *tb[NDA_MAX+1]; 2161 struct net_device *dev; 2162 int err = -EINVAL; 2163 __u8 *addr; 2164 2165 if (!capable(CAP_NET_ADMIN)) 2166 return -EPERM; 2167 2168 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2169 if (err < 0) 2170 return err; 2171 2172 ndm = nlmsg_data(nlh); 2173 if (ndm->ndm_ifindex == 0) { 2174 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2175 return -EINVAL; 2176 } 2177 2178 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2179 if (dev == NULL) { 2180 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2181 return -ENODEV; 2182 } 2183 2184 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2185 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2186 return -EINVAL; 2187 } 2188 2189 addr = nla_data(tb[NDA_LLADDR]); 2190 if (!is_valid_ether_addr(addr)) { 2191 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ether address\n"); 2192 return -EINVAL; 2193 } 2194 2195 err = -EOPNOTSUPP; 2196 2197 /* Support fdb on master device the net/bridge default case */ 2198 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2199 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2200 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2201 const struct net_device_ops *ops = br_dev->netdev_ops; 2202 2203 if (ops->ndo_fdb_del) 2204 err = ops->ndo_fdb_del(ndm, tb, dev, addr); 2205 2206 if (err) 2207 goto out; 2208 else 2209 ndm->ndm_flags &= ~NTF_MASTER; 2210 } 2211 2212 /* Embedded bridge, macvlan, and any other device support */ 2213 if (ndm->ndm_flags & NTF_SELF) { 2214 if (dev->netdev_ops->ndo_fdb_del) 2215 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr); 2216 else 2217 err = ndo_dflt_fdb_del(ndm, tb, dev, addr); 2218 2219 if (!err) { 2220 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2221 ndm->ndm_flags &= ~NTF_SELF; 2222 } 2223 } 2224 out: 2225 return err; 2226 } 2227 2228 static int nlmsg_populate_fdb(struct sk_buff *skb, 2229 struct netlink_callback *cb, 2230 struct net_device *dev, 2231 int *idx, 2232 struct netdev_hw_addr_list *list) 2233 { 2234 struct netdev_hw_addr *ha; 2235 int err; 2236 u32 portid, seq; 2237 2238 portid = NETLINK_CB(cb->skb).portid; 2239 seq = cb->nlh->nlmsg_seq; 2240 2241 list_for_each_entry(ha, &list->list, list) { 2242 if (*idx < cb->args[0]) 2243 goto skip; 2244 2245 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2246 portid, seq, 2247 RTM_NEWNEIGH, NTF_SELF); 2248 if (err < 0) 2249 return err; 2250 skip: 2251 *idx += 1; 2252 } 2253 return 0; 2254 } 2255 2256 /** 2257 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2258 * @nlh: netlink message header 2259 * @dev: netdevice 2260 * 2261 * Default netdevice operation to dump the existing unicast address list. 2262 * Returns zero on success. 2263 */ 2264 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2265 struct netlink_callback *cb, 2266 struct net_device *dev, 2267 int idx) 2268 { 2269 int err; 2270 2271 netif_addr_lock_bh(dev); 2272 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2273 if (err) 2274 goto out; 2275 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2276 out: 2277 netif_addr_unlock_bh(dev); 2278 return idx; 2279 } 2280 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2281 2282 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2283 { 2284 int idx = 0; 2285 struct net *net = sock_net(skb->sk); 2286 struct net_device *dev; 2287 2288 rcu_read_lock(); 2289 for_each_netdev_rcu(net, dev) { 2290 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2291 struct net_device *br_dev; 2292 const struct net_device_ops *ops; 2293 2294 br_dev = netdev_master_upper_dev_get(dev); 2295 ops = br_dev->netdev_ops; 2296 if (ops->ndo_fdb_dump) 2297 idx = ops->ndo_fdb_dump(skb, cb, dev, idx); 2298 } 2299 2300 if (dev->netdev_ops->ndo_fdb_dump) 2301 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx); 2302 else 2303 ndo_dflt_fdb_dump(skb, cb, dev, idx); 2304 } 2305 rcu_read_unlock(); 2306 2307 cb->args[0] = idx; 2308 return skb->len; 2309 } 2310 2311 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2312 struct net_device *dev, u16 mode) 2313 { 2314 struct nlmsghdr *nlh; 2315 struct ifinfomsg *ifm; 2316 struct nlattr *br_afspec; 2317 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2318 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2319 2320 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); 2321 if (nlh == NULL) 2322 return -EMSGSIZE; 2323 2324 ifm = nlmsg_data(nlh); 2325 ifm->ifi_family = AF_BRIDGE; 2326 ifm->__ifi_pad = 0; 2327 ifm->ifi_type = dev->type; 2328 ifm->ifi_index = dev->ifindex; 2329 ifm->ifi_flags = dev_get_flags(dev); 2330 ifm->ifi_change = 0; 2331 2332 2333 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2334 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2335 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2336 (br_dev && 2337 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2338 (dev->addr_len && 2339 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2340 (dev->ifindex != dev->iflink && 2341 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 2342 goto nla_put_failure; 2343 2344 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2345 if (!br_afspec) 2346 goto nla_put_failure; 2347 2348 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) || 2349 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2350 nla_nest_cancel(skb, br_afspec); 2351 goto nla_put_failure; 2352 } 2353 nla_nest_end(skb, br_afspec); 2354 2355 return nlmsg_end(skb, nlh); 2356 nla_put_failure: 2357 nlmsg_cancel(skb, nlh); 2358 return -EMSGSIZE; 2359 } 2360 EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2361 2362 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2363 { 2364 struct net *net = sock_net(skb->sk); 2365 struct net_device *dev; 2366 int idx = 0; 2367 u32 portid = NETLINK_CB(cb->skb).portid; 2368 u32 seq = cb->nlh->nlmsg_seq; 2369 struct nlattr *extfilt; 2370 u32 filter_mask = 0; 2371 2372 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct rtgenmsg), 2373 IFLA_EXT_MASK); 2374 if (extfilt) 2375 filter_mask = nla_get_u32(extfilt); 2376 2377 rcu_read_lock(); 2378 for_each_netdev_rcu(net, dev) { 2379 const struct net_device_ops *ops = dev->netdev_ops; 2380 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2381 2382 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2383 if (idx >= cb->args[0] && 2384 br_dev->netdev_ops->ndo_bridge_getlink( 2385 skb, portid, seq, dev, filter_mask) < 0) 2386 break; 2387 idx++; 2388 } 2389 2390 if (ops->ndo_bridge_getlink) { 2391 if (idx >= cb->args[0] && 2392 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2393 filter_mask) < 0) 2394 break; 2395 idx++; 2396 } 2397 } 2398 rcu_read_unlock(); 2399 cb->args[0] = idx; 2400 2401 return skb->len; 2402 } 2403 2404 static inline size_t bridge_nlmsg_size(void) 2405 { 2406 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2407 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 2408 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 2409 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 2410 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 2411 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 2412 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 2413 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 2414 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 2415 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 2416 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 2417 } 2418 2419 static int rtnl_bridge_notify(struct net_device *dev, u16 flags) 2420 { 2421 struct net *net = dev_net(dev); 2422 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2423 struct sk_buff *skb; 2424 int err = -EOPNOTSUPP; 2425 2426 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 2427 if (!skb) { 2428 err = -ENOMEM; 2429 goto errout; 2430 } 2431 2432 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) && 2433 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2434 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2435 if (err < 0) 2436 goto errout; 2437 } 2438 2439 if ((flags & BRIDGE_FLAGS_SELF) && 2440 dev->netdev_ops->ndo_bridge_getlink) { 2441 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2442 if (err < 0) 2443 goto errout; 2444 } 2445 2446 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 2447 return 0; 2448 errout: 2449 WARN_ON(err == -EMSGSIZE); 2450 kfree_skb(skb); 2451 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2452 return err; 2453 } 2454 2455 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2456 { 2457 struct net *net = sock_net(skb->sk); 2458 struct ifinfomsg *ifm; 2459 struct net_device *dev; 2460 struct nlattr *br_spec, *attr = NULL; 2461 int rem, err = -EOPNOTSUPP; 2462 u16 oflags, flags = 0; 2463 bool have_flags = false; 2464 2465 if (nlmsg_len(nlh) < sizeof(*ifm)) 2466 return -EINVAL; 2467 2468 ifm = nlmsg_data(nlh); 2469 if (ifm->ifi_family != AF_BRIDGE) 2470 return -EPFNOSUPPORT; 2471 2472 dev = __dev_get_by_index(net, ifm->ifi_index); 2473 if (!dev) { 2474 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2475 return -ENODEV; 2476 } 2477 2478 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2479 if (br_spec) { 2480 nla_for_each_nested(attr, br_spec, rem) { 2481 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2482 have_flags = true; 2483 flags = nla_get_u16(attr); 2484 break; 2485 } 2486 } 2487 } 2488 2489 oflags = flags; 2490 2491 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2492 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2493 2494 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 2495 err = -EOPNOTSUPP; 2496 goto out; 2497 } 2498 2499 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2500 if (err) 2501 goto out; 2502 2503 flags &= ~BRIDGE_FLAGS_MASTER; 2504 } 2505 2506 if ((flags & BRIDGE_FLAGS_SELF)) { 2507 if (!dev->netdev_ops->ndo_bridge_setlink) 2508 err = -EOPNOTSUPP; 2509 else 2510 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2511 2512 if (!err) 2513 flags &= ~BRIDGE_FLAGS_SELF; 2514 } 2515 2516 if (have_flags) 2517 memcpy(nla_data(attr), &flags, sizeof(flags)); 2518 /* Generate event to notify upper layer of bridge change */ 2519 if (!err) 2520 err = rtnl_bridge_notify(dev, oflags); 2521 out: 2522 return err; 2523 } 2524 2525 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2526 { 2527 struct net *net = sock_net(skb->sk); 2528 struct ifinfomsg *ifm; 2529 struct net_device *dev; 2530 struct nlattr *br_spec, *attr = NULL; 2531 int rem, err = -EOPNOTSUPP; 2532 u16 oflags, flags = 0; 2533 bool have_flags = false; 2534 2535 if (nlmsg_len(nlh) < sizeof(*ifm)) 2536 return -EINVAL; 2537 2538 ifm = nlmsg_data(nlh); 2539 if (ifm->ifi_family != AF_BRIDGE) 2540 return -EPFNOSUPPORT; 2541 2542 dev = __dev_get_by_index(net, ifm->ifi_index); 2543 if (!dev) { 2544 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2545 return -ENODEV; 2546 } 2547 2548 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2549 if (br_spec) { 2550 nla_for_each_nested(attr, br_spec, rem) { 2551 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2552 have_flags = true; 2553 flags = nla_get_u16(attr); 2554 break; 2555 } 2556 } 2557 } 2558 2559 oflags = flags; 2560 2561 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2562 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2563 2564 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 2565 err = -EOPNOTSUPP; 2566 goto out; 2567 } 2568 2569 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2570 if (err) 2571 goto out; 2572 2573 flags &= ~BRIDGE_FLAGS_MASTER; 2574 } 2575 2576 if ((flags & BRIDGE_FLAGS_SELF)) { 2577 if (!dev->netdev_ops->ndo_bridge_dellink) 2578 err = -EOPNOTSUPP; 2579 else 2580 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2581 2582 if (!err) 2583 flags &= ~BRIDGE_FLAGS_SELF; 2584 } 2585 2586 if (have_flags) 2587 memcpy(nla_data(attr), &flags, sizeof(flags)); 2588 /* Generate event to notify upper layer of bridge change */ 2589 if (!err) 2590 err = rtnl_bridge_notify(dev, oflags); 2591 out: 2592 return err; 2593 } 2594 2595 /* Process one rtnetlink message. */ 2596 2597 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2598 { 2599 struct net *net = sock_net(skb->sk); 2600 rtnl_doit_func doit; 2601 int sz_idx, kind; 2602 int family; 2603 int type; 2604 int err; 2605 2606 type = nlh->nlmsg_type; 2607 if (type > RTM_MAX) 2608 return -EOPNOTSUPP; 2609 2610 type -= RTM_BASE; 2611 2612 /* All the messages must have at least 1 byte length */ 2613 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 2614 return 0; 2615 2616 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 2617 sz_idx = type>>2; 2618 kind = type&3; 2619 2620 if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN)) 2621 return -EPERM; 2622 2623 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2624 struct sock *rtnl; 2625 rtnl_dumpit_func dumpit; 2626 rtnl_calcit_func calcit; 2627 u16 min_dump_alloc = 0; 2628 2629 dumpit = rtnl_get_dumpit(family, type); 2630 if (dumpit == NULL) 2631 return -EOPNOTSUPP; 2632 calcit = rtnl_get_calcit(family, type); 2633 if (calcit) 2634 min_dump_alloc = calcit(skb, nlh); 2635 2636 __rtnl_unlock(); 2637 rtnl = net->rtnl; 2638 { 2639 struct netlink_dump_control c = { 2640 .dump = dumpit, 2641 .min_dump_alloc = min_dump_alloc, 2642 }; 2643 err = netlink_dump_start(rtnl, skb, nlh, &c); 2644 } 2645 rtnl_lock(); 2646 return err; 2647 } 2648 2649 doit = rtnl_get_doit(family, type); 2650 if (doit == NULL) 2651 return -EOPNOTSUPP; 2652 2653 return doit(skb, nlh); 2654 } 2655 2656 static void rtnetlink_rcv(struct sk_buff *skb) 2657 { 2658 rtnl_lock(); 2659 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2660 rtnl_unlock(); 2661 } 2662 2663 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2664 { 2665 struct net_device *dev = ptr; 2666 2667 switch (event) { 2668 case NETDEV_UP: 2669 case NETDEV_DOWN: 2670 case NETDEV_PRE_UP: 2671 case NETDEV_POST_INIT: 2672 case NETDEV_REGISTER: 2673 case NETDEV_CHANGE: 2674 case NETDEV_PRE_TYPE_CHANGE: 2675 case NETDEV_GOING_DOWN: 2676 case NETDEV_UNREGISTER: 2677 case NETDEV_UNREGISTER_FINAL: 2678 case NETDEV_RELEASE: 2679 case NETDEV_JOIN: 2680 break; 2681 default: 2682 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2683 break; 2684 } 2685 return NOTIFY_DONE; 2686 } 2687 2688 static struct notifier_block rtnetlink_dev_notifier = { 2689 .notifier_call = rtnetlink_event, 2690 }; 2691 2692 2693 static int __net_init rtnetlink_net_init(struct net *net) 2694 { 2695 struct sock *sk; 2696 struct netlink_kernel_cfg cfg = { 2697 .groups = RTNLGRP_MAX, 2698 .input = rtnetlink_rcv, 2699 .cb_mutex = &rtnl_mutex, 2700 .flags = NL_CFG_F_NONROOT_RECV, 2701 }; 2702 2703 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 2704 if (!sk) 2705 return -ENOMEM; 2706 net->rtnl = sk; 2707 return 0; 2708 } 2709 2710 static void __net_exit rtnetlink_net_exit(struct net *net) 2711 { 2712 netlink_kernel_release(net->rtnl); 2713 net->rtnl = NULL; 2714 } 2715 2716 static struct pernet_operations rtnetlink_net_ops = { 2717 .init = rtnetlink_net_init, 2718 .exit = rtnetlink_net_exit, 2719 }; 2720 2721 void __init rtnetlink_init(void) 2722 { 2723 if (register_pernet_subsys(&rtnetlink_net_ops)) 2724 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2725 2726 register_netdevice_notifier(&rtnetlink_dev_notifier); 2727 2728 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2729 rtnl_dump_ifinfo, rtnl_calcit); 2730 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2731 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2732 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2733 2734 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2735 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2736 2737 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 2738 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 2739 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 2740 2741 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 2742 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 2743 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 2744 } 2745 2746