1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/if_bridge.h> 39 #include <linux/pci.h> 40 #include <linux/etherdevice.h> 41 42 #include <asm/uaccess.h> 43 44 #include <linux/inet.h> 45 #include <linux/netdevice.h> 46 #include <net/ip.h> 47 #include <net/protocol.h> 48 #include <net/arp.h> 49 #include <net/route.h> 50 #include <net/udp.h> 51 #include <net/sock.h> 52 #include <net/pkt_sched.h> 53 #include <net/fib_rules.h> 54 #include <net/rtnetlink.h> 55 #include <net/net_namespace.h> 56 57 struct rtnl_link { 58 rtnl_doit_func doit; 59 rtnl_dumpit_func dumpit; 60 rtnl_calcit_func calcit; 61 }; 62 63 static DEFINE_MUTEX(rtnl_mutex); 64 65 void rtnl_lock(void) 66 { 67 mutex_lock(&rtnl_mutex); 68 } 69 EXPORT_SYMBOL(rtnl_lock); 70 71 void __rtnl_unlock(void) 72 { 73 mutex_unlock(&rtnl_mutex); 74 } 75 76 void rtnl_unlock(void) 77 { 78 /* This fellow will unlock it for us. */ 79 netdev_run_todo(); 80 } 81 EXPORT_SYMBOL(rtnl_unlock); 82 83 int rtnl_trylock(void) 84 { 85 return mutex_trylock(&rtnl_mutex); 86 } 87 EXPORT_SYMBOL(rtnl_trylock); 88 89 int rtnl_is_locked(void) 90 { 91 return mutex_is_locked(&rtnl_mutex); 92 } 93 EXPORT_SYMBOL(rtnl_is_locked); 94 95 #ifdef CONFIG_PROVE_LOCKING 96 int lockdep_rtnl_is_held(void) 97 { 98 return lockdep_is_held(&rtnl_mutex); 99 } 100 EXPORT_SYMBOL(lockdep_rtnl_is_held); 101 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 102 103 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 104 105 static inline int rtm_msgindex(int msgtype) 106 { 107 int msgindex = msgtype - RTM_BASE; 108 109 /* 110 * msgindex < 0 implies someone tried to register a netlink 111 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 112 * the message type has not been added to linux/rtnetlink.h 113 */ 114 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 115 116 return msgindex; 117 } 118 119 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 120 { 121 struct rtnl_link *tab; 122 123 if (protocol <= RTNL_FAMILY_MAX) 124 tab = rtnl_msg_handlers[protocol]; 125 else 126 tab = NULL; 127 128 if (tab == NULL || tab[msgindex].doit == NULL) 129 tab = rtnl_msg_handlers[PF_UNSPEC]; 130 131 return tab[msgindex].doit; 132 } 133 134 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 135 { 136 struct rtnl_link *tab; 137 138 if (protocol <= RTNL_FAMILY_MAX) 139 tab = rtnl_msg_handlers[protocol]; 140 else 141 tab = NULL; 142 143 if (tab == NULL || tab[msgindex].dumpit == NULL) 144 tab = rtnl_msg_handlers[PF_UNSPEC]; 145 146 return tab[msgindex].dumpit; 147 } 148 149 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 150 { 151 struct rtnl_link *tab; 152 153 if (protocol <= RTNL_FAMILY_MAX) 154 tab = rtnl_msg_handlers[protocol]; 155 else 156 tab = NULL; 157 158 if (tab == NULL || tab[msgindex].calcit == NULL) 159 tab = rtnl_msg_handlers[PF_UNSPEC]; 160 161 return tab[msgindex].calcit; 162 } 163 164 /** 165 * __rtnl_register - Register a rtnetlink message type 166 * @protocol: Protocol family or PF_UNSPEC 167 * @msgtype: rtnetlink message type 168 * @doit: Function pointer called for each request message 169 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 170 * @calcit: Function pointer to calc size of dump message 171 * 172 * Registers the specified function pointers (at least one of them has 173 * to be non-NULL) to be called whenever a request message for the 174 * specified protocol family and message type is received. 175 * 176 * The special protocol family PF_UNSPEC may be used to define fallback 177 * function pointers for the case when no entry for the specific protocol 178 * family exists. 179 * 180 * Returns 0 on success or a negative error code. 181 */ 182 int __rtnl_register(int protocol, int msgtype, 183 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 184 rtnl_calcit_func calcit) 185 { 186 struct rtnl_link *tab; 187 int msgindex; 188 189 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 190 msgindex = rtm_msgindex(msgtype); 191 192 tab = rtnl_msg_handlers[protocol]; 193 if (tab == NULL) { 194 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 195 if (tab == NULL) 196 return -ENOBUFS; 197 198 rtnl_msg_handlers[protocol] = tab; 199 } 200 201 if (doit) 202 tab[msgindex].doit = doit; 203 204 if (dumpit) 205 tab[msgindex].dumpit = dumpit; 206 207 if (calcit) 208 tab[msgindex].calcit = calcit; 209 210 return 0; 211 } 212 EXPORT_SYMBOL_GPL(__rtnl_register); 213 214 /** 215 * rtnl_register - Register a rtnetlink message type 216 * 217 * Identical to __rtnl_register() but panics on failure. This is useful 218 * as failure of this function is very unlikely, it can only happen due 219 * to lack of memory when allocating the chain to store all message 220 * handlers for a protocol. Meant for use in init functions where lack 221 * of memory implies no sense in continuing. 222 */ 223 void rtnl_register(int protocol, int msgtype, 224 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 225 rtnl_calcit_func calcit) 226 { 227 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 228 panic("Unable to register rtnetlink message handler, " 229 "protocol = %d, message type = %d\n", 230 protocol, msgtype); 231 } 232 EXPORT_SYMBOL_GPL(rtnl_register); 233 234 /** 235 * rtnl_unregister - Unregister a rtnetlink message type 236 * @protocol: Protocol family or PF_UNSPEC 237 * @msgtype: rtnetlink message type 238 * 239 * Returns 0 on success or a negative error code. 240 */ 241 int rtnl_unregister(int protocol, int msgtype) 242 { 243 int msgindex; 244 245 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 246 msgindex = rtm_msgindex(msgtype); 247 248 if (rtnl_msg_handlers[protocol] == NULL) 249 return -ENOENT; 250 251 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 252 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 253 254 return 0; 255 } 256 EXPORT_SYMBOL_GPL(rtnl_unregister); 257 258 /** 259 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 260 * @protocol : Protocol family or PF_UNSPEC 261 * 262 * Identical to calling rtnl_unregster() for all registered message types 263 * of a certain protocol family. 264 */ 265 void rtnl_unregister_all(int protocol) 266 { 267 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 268 269 kfree(rtnl_msg_handlers[protocol]); 270 rtnl_msg_handlers[protocol] = NULL; 271 } 272 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 273 274 static LIST_HEAD(link_ops); 275 276 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 277 { 278 const struct rtnl_link_ops *ops; 279 280 list_for_each_entry(ops, &link_ops, list) { 281 if (!strcmp(ops->kind, kind)) 282 return ops; 283 } 284 return NULL; 285 } 286 287 /** 288 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 289 * @ops: struct rtnl_link_ops * to register 290 * 291 * The caller must hold the rtnl_mutex. This function should be used 292 * by drivers that create devices during module initialization. It 293 * must be called before registering the devices. 294 * 295 * Returns 0 on success or a negative error code. 296 */ 297 int __rtnl_link_register(struct rtnl_link_ops *ops) 298 { 299 if (rtnl_link_ops_get(ops->kind)) 300 return -EEXIST; 301 302 if (!ops->dellink) 303 ops->dellink = unregister_netdevice_queue; 304 305 list_add_tail(&ops->list, &link_ops); 306 return 0; 307 } 308 EXPORT_SYMBOL_GPL(__rtnl_link_register); 309 310 /** 311 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 312 * @ops: struct rtnl_link_ops * to register 313 * 314 * Returns 0 on success or a negative error code. 315 */ 316 int rtnl_link_register(struct rtnl_link_ops *ops) 317 { 318 int err; 319 320 rtnl_lock(); 321 err = __rtnl_link_register(ops); 322 rtnl_unlock(); 323 return err; 324 } 325 EXPORT_SYMBOL_GPL(rtnl_link_register); 326 327 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 328 { 329 struct net_device *dev; 330 LIST_HEAD(list_kill); 331 332 for_each_netdev(net, dev) { 333 if (dev->rtnl_link_ops == ops) 334 ops->dellink(dev, &list_kill); 335 } 336 unregister_netdevice_many(&list_kill); 337 } 338 339 /** 340 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 341 * @ops: struct rtnl_link_ops * to unregister 342 * 343 * The caller must hold the rtnl_mutex. 344 */ 345 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 346 { 347 struct net *net; 348 349 for_each_net(net) { 350 __rtnl_kill_links(net, ops); 351 } 352 list_del(&ops->list); 353 } 354 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 355 356 /** 357 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 358 * @ops: struct rtnl_link_ops * to unregister 359 */ 360 void rtnl_link_unregister(struct rtnl_link_ops *ops) 361 { 362 rtnl_lock(); 363 __rtnl_link_unregister(ops); 364 rtnl_unlock(); 365 } 366 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 367 368 static size_t rtnl_link_get_size(const struct net_device *dev) 369 { 370 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 371 size_t size; 372 373 if (!ops) 374 return 0; 375 376 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 377 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 378 379 if (ops->get_size) 380 /* IFLA_INFO_DATA + nested data */ 381 size += nla_total_size(sizeof(struct nlattr)) + 382 ops->get_size(dev); 383 384 if (ops->get_xstats_size) 385 /* IFLA_INFO_XSTATS */ 386 size += nla_total_size(ops->get_xstats_size(dev)); 387 388 return size; 389 } 390 391 static LIST_HEAD(rtnl_af_ops); 392 393 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 394 { 395 const struct rtnl_af_ops *ops; 396 397 list_for_each_entry(ops, &rtnl_af_ops, list) { 398 if (ops->family == family) 399 return ops; 400 } 401 402 return NULL; 403 } 404 405 /** 406 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink. 407 * @ops: struct rtnl_af_ops * to register 408 * 409 * The caller must hold the rtnl_mutex. 410 * 411 * Returns 0 on success or a negative error code. 412 */ 413 int __rtnl_af_register(struct rtnl_af_ops *ops) 414 { 415 list_add_tail(&ops->list, &rtnl_af_ops); 416 return 0; 417 } 418 EXPORT_SYMBOL_GPL(__rtnl_af_register); 419 420 /** 421 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 422 * @ops: struct rtnl_af_ops * to register 423 * 424 * Returns 0 on success or a negative error code. 425 */ 426 int rtnl_af_register(struct rtnl_af_ops *ops) 427 { 428 int err; 429 430 rtnl_lock(); 431 err = __rtnl_af_register(ops); 432 rtnl_unlock(); 433 return err; 434 } 435 EXPORT_SYMBOL_GPL(rtnl_af_register); 436 437 /** 438 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 439 * @ops: struct rtnl_af_ops * to unregister 440 * 441 * The caller must hold the rtnl_mutex. 442 */ 443 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 444 { 445 list_del(&ops->list); 446 } 447 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 448 449 /** 450 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 451 * @ops: struct rtnl_af_ops * to unregister 452 */ 453 void rtnl_af_unregister(struct rtnl_af_ops *ops) 454 { 455 rtnl_lock(); 456 __rtnl_af_unregister(ops); 457 rtnl_unlock(); 458 } 459 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 460 461 static size_t rtnl_link_get_af_size(const struct net_device *dev) 462 { 463 struct rtnl_af_ops *af_ops; 464 size_t size; 465 466 /* IFLA_AF_SPEC */ 467 size = nla_total_size(sizeof(struct nlattr)); 468 469 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 470 if (af_ops->get_link_af_size) { 471 /* AF_* + nested data */ 472 size += nla_total_size(sizeof(struct nlattr)) + 473 af_ops->get_link_af_size(dev); 474 } 475 } 476 477 return size; 478 } 479 480 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 481 { 482 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 483 struct nlattr *linkinfo, *data; 484 int err = -EMSGSIZE; 485 486 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 487 if (linkinfo == NULL) 488 goto out; 489 490 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 491 goto err_cancel_link; 492 if (ops->fill_xstats) { 493 err = ops->fill_xstats(skb, dev); 494 if (err < 0) 495 goto err_cancel_link; 496 } 497 if (ops->fill_info) { 498 data = nla_nest_start(skb, IFLA_INFO_DATA); 499 if (data == NULL) { 500 err = -EMSGSIZE; 501 goto err_cancel_link; 502 } 503 err = ops->fill_info(skb, dev); 504 if (err < 0) 505 goto err_cancel_data; 506 nla_nest_end(skb, data); 507 } 508 509 nla_nest_end(skb, linkinfo); 510 return 0; 511 512 err_cancel_data: 513 nla_nest_cancel(skb, data); 514 err_cancel_link: 515 nla_nest_cancel(skb, linkinfo); 516 out: 517 return err; 518 } 519 520 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 521 { 522 struct sock *rtnl = net->rtnl; 523 int err = 0; 524 525 NETLINK_CB(skb).dst_group = group; 526 if (echo) 527 atomic_inc(&skb->users); 528 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 529 if (echo) 530 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 531 return err; 532 } 533 534 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 535 { 536 struct sock *rtnl = net->rtnl; 537 538 return nlmsg_unicast(rtnl, skb, pid); 539 } 540 EXPORT_SYMBOL(rtnl_unicast); 541 542 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 543 struct nlmsghdr *nlh, gfp_t flags) 544 { 545 struct sock *rtnl = net->rtnl; 546 int report = 0; 547 548 if (nlh) 549 report = nlmsg_report(nlh); 550 551 nlmsg_notify(rtnl, skb, pid, group, report, flags); 552 } 553 EXPORT_SYMBOL(rtnl_notify); 554 555 void rtnl_set_sk_err(struct net *net, u32 group, int error) 556 { 557 struct sock *rtnl = net->rtnl; 558 559 netlink_set_err(rtnl, 0, group, error); 560 } 561 EXPORT_SYMBOL(rtnl_set_sk_err); 562 563 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 564 { 565 struct nlattr *mx; 566 int i, valid = 0; 567 568 mx = nla_nest_start(skb, RTA_METRICS); 569 if (mx == NULL) 570 return -ENOBUFS; 571 572 for (i = 0; i < RTAX_MAX; i++) { 573 if (metrics[i]) { 574 valid++; 575 if (nla_put_u32(skb, i+1, metrics[i])) 576 goto nla_put_failure; 577 } 578 } 579 580 if (!valid) { 581 nla_nest_cancel(skb, mx); 582 return 0; 583 } 584 585 return nla_nest_end(skb, mx); 586 587 nla_put_failure: 588 nla_nest_cancel(skb, mx); 589 return -EMSGSIZE; 590 } 591 EXPORT_SYMBOL(rtnetlink_put_metrics); 592 593 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 594 long expires, u32 error) 595 { 596 struct rta_cacheinfo ci = { 597 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 598 .rta_used = dst->__use, 599 .rta_clntref = atomic_read(&(dst->__refcnt)), 600 .rta_error = error, 601 .rta_id = id, 602 }; 603 604 if (expires) { 605 unsigned long clock; 606 607 clock = jiffies_to_clock_t(abs(expires)); 608 clock = min_t(unsigned long, clock, INT_MAX); 609 ci.rta_expires = (expires > 0) ? clock : -clock; 610 } 611 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 612 } 613 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 614 615 static void set_operstate(struct net_device *dev, unsigned char transition) 616 { 617 unsigned char operstate = dev->operstate; 618 619 switch (transition) { 620 case IF_OPER_UP: 621 if ((operstate == IF_OPER_DORMANT || 622 operstate == IF_OPER_UNKNOWN) && 623 !netif_dormant(dev)) 624 operstate = IF_OPER_UP; 625 break; 626 627 case IF_OPER_DORMANT: 628 if (operstate == IF_OPER_UP || 629 operstate == IF_OPER_UNKNOWN) 630 operstate = IF_OPER_DORMANT; 631 break; 632 } 633 634 if (dev->operstate != operstate) { 635 write_lock_bh(&dev_base_lock); 636 dev->operstate = operstate; 637 write_unlock_bh(&dev_base_lock); 638 netdev_state_change(dev); 639 } 640 } 641 642 static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 643 { 644 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 645 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 646 } 647 648 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 649 const struct ifinfomsg *ifm) 650 { 651 unsigned int flags = ifm->ifi_flags; 652 653 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 654 if (ifm->ifi_change) 655 flags = (flags & ifm->ifi_change) | 656 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 657 658 return flags; 659 } 660 661 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 662 const struct rtnl_link_stats64 *b) 663 { 664 a->rx_packets = b->rx_packets; 665 a->tx_packets = b->tx_packets; 666 a->rx_bytes = b->rx_bytes; 667 a->tx_bytes = b->tx_bytes; 668 a->rx_errors = b->rx_errors; 669 a->tx_errors = b->tx_errors; 670 a->rx_dropped = b->rx_dropped; 671 a->tx_dropped = b->tx_dropped; 672 673 a->multicast = b->multicast; 674 a->collisions = b->collisions; 675 676 a->rx_length_errors = b->rx_length_errors; 677 a->rx_over_errors = b->rx_over_errors; 678 a->rx_crc_errors = b->rx_crc_errors; 679 a->rx_frame_errors = b->rx_frame_errors; 680 a->rx_fifo_errors = b->rx_fifo_errors; 681 a->rx_missed_errors = b->rx_missed_errors; 682 683 a->tx_aborted_errors = b->tx_aborted_errors; 684 a->tx_carrier_errors = b->tx_carrier_errors; 685 a->tx_fifo_errors = b->tx_fifo_errors; 686 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 687 a->tx_window_errors = b->tx_window_errors; 688 689 a->rx_compressed = b->rx_compressed; 690 a->tx_compressed = b->tx_compressed; 691 } 692 693 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 694 { 695 memcpy(v, b, sizeof(*b)); 696 } 697 698 /* All VF info */ 699 static inline int rtnl_vfinfo_size(const struct net_device *dev, 700 u32 ext_filter_mask) 701 { 702 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 703 (ext_filter_mask & RTEXT_FILTER_VF)) { 704 int num_vfs = dev_num_vf(dev->dev.parent); 705 size_t size = nla_total_size(sizeof(struct nlattr)); 706 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 707 size += num_vfs * 708 (nla_total_size(sizeof(struct ifla_vf_mac)) + 709 nla_total_size(sizeof(struct ifla_vf_vlan)) + 710 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 711 nla_total_size(sizeof(struct ifla_vf_spoofchk))); 712 return size; 713 } else 714 return 0; 715 } 716 717 static size_t rtnl_port_size(const struct net_device *dev) 718 { 719 size_t port_size = nla_total_size(4) /* PORT_VF */ 720 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 721 + nla_total_size(sizeof(struct ifla_port_vsi)) 722 /* PORT_VSI_TYPE */ 723 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 724 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 725 + nla_total_size(1) /* PROT_VDP_REQUEST */ 726 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 727 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 728 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 729 + port_size; 730 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 731 + port_size; 732 733 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 734 return 0; 735 if (dev_num_vf(dev->dev.parent)) 736 return port_self_size + vf_ports_size + 737 vf_port_size * dev_num_vf(dev->dev.parent); 738 else 739 return port_self_size; 740 } 741 742 static noinline size_t if_nlmsg_size(const struct net_device *dev, 743 u32 ext_filter_mask) 744 { 745 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 746 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 747 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 748 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 749 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 750 + nla_total_size(sizeof(struct rtnl_link_stats)) 751 + nla_total_size(sizeof(struct rtnl_link_stats64)) 752 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 753 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 754 + nla_total_size(4) /* IFLA_TXQLEN */ 755 + nla_total_size(4) /* IFLA_WEIGHT */ 756 + nla_total_size(4) /* IFLA_MTU */ 757 + nla_total_size(4) /* IFLA_LINK */ 758 + nla_total_size(4) /* IFLA_MASTER */ 759 + nla_total_size(1) /* IFLA_CARRIER */ 760 + nla_total_size(4) /* IFLA_PROMISCUITY */ 761 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 762 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 763 + nla_total_size(1) /* IFLA_OPERSTATE */ 764 + nla_total_size(1) /* IFLA_LINKMODE */ 765 + nla_total_size(ext_filter_mask 766 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 767 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 768 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 769 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 770 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 771 } 772 773 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 774 { 775 struct nlattr *vf_ports; 776 struct nlattr *vf_port; 777 int vf; 778 int err; 779 780 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 781 if (!vf_ports) 782 return -EMSGSIZE; 783 784 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 785 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 786 if (!vf_port) 787 goto nla_put_failure; 788 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 789 goto nla_put_failure; 790 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 791 if (err == -EMSGSIZE) 792 goto nla_put_failure; 793 if (err) { 794 nla_nest_cancel(skb, vf_port); 795 continue; 796 } 797 nla_nest_end(skb, vf_port); 798 } 799 800 nla_nest_end(skb, vf_ports); 801 802 return 0; 803 804 nla_put_failure: 805 nla_nest_cancel(skb, vf_ports); 806 return -EMSGSIZE; 807 } 808 809 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 810 { 811 struct nlattr *port_self; 812 int err; 813 814 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 815 if (!port_self) 816 return -EMSGSIZE; 817 818 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 819 if (err) { 820 nla_nest_cancel(skb, port_self); 821 return (err == -EMSGSIZE) ? err : 0; 822 } 823 824 nla_nest_end(skb, port_self); 825 826 return 0; 827 } 828 829 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 830 { 831 int err; 832 833 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 834 return 0; 835 836 err = rtnl_port_self_fill(skb, dev); 837 if (err) 838 return err; 839 840 if (dev_num_vf(dev->dev.parent)) { 841 err = rtnl_vf_ports_fill(skb, dev); 842 if (err) 843 return err; 844 } 845 846 return 0; 847 } 848 849 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 850 int type, u32 pid, u32 seq, u32 change, 851 unsigned int flags, u32 ext_filter_mask) 852 { 853 struct ifinfomsg *ifm; 854 struct nlmsghdr *nlh; 855 struct rtnl_link_stats64 temp; 856 const struct rtnl_link_stats64 *stats; 857 struct nlattr *attr, *af_spec; 858 struct rtnl_af_ops *af_ops; 859 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 860 861 ASSERT_RTNL(); 862 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 863 if (nlh == NULL) 864 return -EMSGSIZE; 865 866 ifm = nlmsg_data(nlh); 867 ifm->ifi_family = AF_UNSPEC; 868 ifm->__ifi_pad = 0; 869 ifm->ifi_type = dev->type; 870 ifm->ifi_index = dev->ifindex; 871 ifm->ifi_flags = dev_get_flags(dev); 872 ifm->ifi_change = change; 873 874 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 875 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 876 nla_put_u8(skb, IFLA_OPERSTATE, 877 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 878 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 879 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 880 nla_put_u32(skb, IFLA_GROUP, dev->group) || 881 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 882 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 883 #ifdef CONFIG_RPS 884 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 885 #endif 886 (dev->ifindex != dev->iflink && 887 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 888 (upper_dev && 889 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 890 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 891 (dev->qdisc && 892 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 893 (dev->ifalias && 894 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias))) 895 goto nla_put_failure; 896 897 if (1) { 898 struct rtnl_link_ifmap map = { 899 .mem_start = dev->mem_start, 900 .mem_end = dev->mem_end, 901 .base_addr = dev->base_addr, 902 .irq = dev->irq, 903 .dma = dev->dma, 904 .port = dev->if_port, 905 }; 906 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 907 goto nla_put_failure; 908 } 909 910 if (dev->addr_len) { 911 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 912 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 913 goto nla_put_failure; 914 } 915 916 attr = nla_reserve(skb, IFLA_STATS, 917 sizeof(struct rtnl_link_stats)); 918 if (attr == NULL) 919 goto nla_put_failure; 920 921 stats = dev_get_stats(dev, &temp); 922 copy_rtnl_link_stats(nla_data(attr), stats); 923 924 attr = nla_reserve(skb, IFLA_STATS64, 925 sizeof(struct rtnl_link_stats64)); 926 if (attr == NULL) 927 goto nla_put_failure; 928 copy_rtnl_link_stats64(nla_data(attr), stats); 929 930 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 931 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 932 goto nla_put_failure; 933 934 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 935 && (ext_filter_mask & RTEXT_FILTER_VF)) { 936 int i; 937 938 struct nlattr *vfinfo, *vf; 939 int num_vfs = dev_num_vf(dev->dev.parent); 940 941 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 942 if (!vfinfo) 943 goto nla_put_failure; 944 for (i = 0; i < num_vfs; i++) { 945 struct ifla_vf_info ivi; 946 struct ifla_vf_mac vf_mac; 947 struct ifla_vf_vlan vf_vlan; 948 struct ifla_vf_tx_rate vf_tx_rate; 949 struct ifla_vf_spoofchk vf_spoofchk; 950 struct ifla_vf_link_state vf_linkstate; 951 952 /* 953 * Not all SR-IOV capable drivers support the 954 * spoofcheck query. Preset to -1 so the user 955 * space tool can detect that the driver didn't 956 * report anything. 957 */ 958 ivi.spoofchk = -1; 959 memset(ivi.mac, 0, sizeof(ivi.mac)); 960 /* The default value for VF link state is "auto" 961 * IFLA_VF_LINK_STATE_AUTO which equals zero 962 */ 963 ivi.linkstate = 0; 964 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 965 break; 966 vf_mac.vf = 967 vf_vlan.vf = 968 vf_tx_rate.vf = 969 vf_spoofchk.vf = 970 vf_linkstate.vf = ivi.vf; 971 972 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 973 vf_vlan.vlan = ivi.vlan; 974 vf_vlan.qos = ivi.qos; 975 vf_tx_rate.rate = ivi.tx_rate; 976 vf_spoofchk.setting = ivi.spoofchk; 977 vf_linkstate.link_state = ivi.linkstate; 978 vf = nla_nest_start(skb, IFLA_VF_INFO); 979 if (!vf) { 980 nla_nest_cancel(skb, vfinfo); 981 goto nla_put_failure; 982 } 983 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 984 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 985 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 986 &vf_tx_rate) || 987 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 988 &vf_spoofchk) || 989 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 990 &vf_linkstate)) 991 goto nla_put_failure; 992 nla_nest_end(skb, vf); 993 } 994 nla_nest_end(skb, vfinfo); 995 } 996 997 if (rtnl_port_fill(skb, dev)) 998 goto nla_put_failure; 999 1000 if (dev->rtnl_link_ops) { 1001 if (rtnl_link_fill(skb, dev) < 0) 1002 goto nla_put_failure; 1003 } 1004 1005 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1006 goto nla_put_failure; 1007 1008 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1009 if (af_ops->fill_link_af) { 1010 struct nlattr *af; 1011 int err; 1012 1013 if (!(af = nla_nest_start(skb, af_ops->family))) 1014 goto nla_put_failure; 1015 1016 err = af_ops->fill_link_af(skb, dev); 1017 1018 /* 1019 * Caller may return ENODATA to indicate that there 1020 * was no data to be dumped. This is not an error, it 1021 * means we should trim the attribute header and 1022 * continue. 1023 */ 1024 if (err == -ENODATA) 1025 nla_nest_cancel(skb, af); 1026 else if (err < 0) 1027 goto nla_put_failure; 1028 1029 nla_nest_end(skb, af); 1030 } 1031 } 1032 1033 nla_nest_end(skb, af_spec); 1034 1035 return nlmsg_end(skb, nlh); 1036 1037 nla_put_failure: 1038 nlmsg_cancel(skb, nlh); 1039 return -EMSGSIZE; 1040 } 1041 1042 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1043 { 1044 struct net *net = sock_net(skb->sk); 1045 int h, s_h; 1046 int idx = 0, s_idx; 1047 struct net_device *dev; 1048 struct hlist_head *head; 1049 struct nlattr *tb[IFLA_MAX+1]; 1050 u32 ext_filter_mask = 0; 1051 1052 s_h = cb->args[0]; 1053 s_idx = cb->args[1]; 1054 1055 rcu_read_lock(); 1056 cb->seq = net->dev_base_seq; 1057 1058 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 1059 ifla_policy) >= 0) { 1060 1061 if (tb[IFLA_EXT_MASK]) 1062 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1063 } 1064 1065 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1066 idx = 0; 1067 head = &net->dev_index_head[h]; 1068 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1069 if (idx < s_idx) 1070 goto cont; 1071 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1072 NETLINK_CB(cb->skb).portid, 1073 cb->nlh->nlmsg_seq, 0, 1074 NLM_F_MULTI, 1075 ext_filter_mask) <= 0) 1076 goto out; 1077 1078 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1079 cont: 1080 idx++; 1081 } 1082 } 1083 out: 1084 rcu_read_unlock(); 1085 cb->args[1] = idx; 1086 cb->args[0] = h; 1087 1088 return skb->len; 1089 } 1090 1091 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1092 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1093 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1094 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1095 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1096 [IFLA_MTU] = { .type = NLA_U32 }, 1097 [IFLA_LINK] = { .type = NLA_U32 }, 1098 [IFLA_MASTER] = { .type = NLA_U32 }, 1099 [IFLA_CARRIER] = { .type = NLA_U8 }, 1100 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1101 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1102 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1103 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1104 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1105 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1106 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1107 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1108 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1109 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1110 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1111 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1112 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1113 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1114 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1115 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1116 }; 1117 EXPORT_SYMBOL(ifla_policy); 1118 1119 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1120 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1121 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1122 }; 1123 1124 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1125 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1126 }; 1127 1128 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1129 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1130 .len = sizeof(struct ifla_vf_mac) }, 1131 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1132 .len = sizeof(struct ifla_vf_vlan) }, 1133 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1134 .len = sizeof(struct ifla_vf_tx_rate) }, 1135 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1136 .len = sizeof(struct ifla_vf_spoofchk) }, 1137 }; 1138 1139 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1140 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1141 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1142 .len = PORT_PROFILE_MAX }, 1143 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1144 .len = sizeof(struct ifla_port_vsi)}, 1145 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1146 .len = PORT_UUID_MAX }, 1147 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1148 .len = PORT_UUID_MAX }, 1149 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1150 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1151 }; 1152 1153 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1154 { 1155 struct net *net; 1156 /* Examine the link attributes and figure out which 1157 * network namespace we are talking about. 1158 */ 1159 if (tb[IFLA_NET_NS_PID]) 1160 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1161 else if (tb[IFLA_NET_NS_FD]) 1162 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1163 else 1164 net = get_net(src_net); 1165 return net; 1166 } 1167 EXPORT_SYMBOL(rtnl_link_get_net); 1168 1169 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1170 { 1171 if (dev) { 1172 if (tb[IFLA_ADDRESS] && 1173 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1174 return -EINVAL; 1175 1176 if (tb[IFLA_BROADCAST] && 1177 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1178 return -EINVAL; 1179 } 1180 1181 if (tb[IFLA_AF_SPEC]) { 1182 struct nlattr *af; 1183 int rem, err; 1184 1185 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1186 const struct rtnl_af_ops *af_ops; 1187 1188 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1189 return -EAFNOSUPPORT; 1190 1191 if (!af_ops->set_link_af) 1192 return -EOPNOTSUPP; 1193 1194 if (af_ops->validate_link_af) { 1195 err = af_ops->validate_link_af(dev, af); 1196 if (err < 0) 1197 return err; 1198 } 1199 } 1200 } 1201 1202 return 0; 1203 } 1204 1205 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1206 { 1207 int rem, err = -EINVAL; 1208 struct nlattr *vf; 1209 const struct net_device_ops *ops = dev->netdev_ops; 1210 1211 nla_for_each_nested(vf, attr, rem) { 1212 switch (nla_type(vf)) { 1213 case IFLA_VF_MAC: { 1214 struct ifla_vf_mac *ivm; 1215 ivm = nla_data(vf); 1216 err = -EOPNOTSUPP; 1217 if (ops->ndo_set_vf_mac) 1218 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1219 ivm->mac); 1220 break; 1221 } 1222 case IFLA_VF_VLAN: { 1223 struct ifla_vf_vlan *ivv; 1224 ivv = nla_data(vf); 1225 err = -EOPNOTSUPP; 1226 if (ops->ndo_set_vf_vlan) 1227 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1228 ivv->vlan, 1229 ivv->qos); 1230 break; 1231 } 1232 case IFLA_VF_TX_RATE: { 1233 struct ifla_vf_tx_rate *ivt; 1234 ivt = nla_data(vf); 1235 err = -EOPNOTSUPP; 1236 if (ops->ndo_set_vf_tx_rate) 1237 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1238 ivt->rate); 1239 break; 1240 } 1241 case IFLA_VF_SPOOFCHK: { 1242 struct ifla_vf_spoofchk *ivs; 1243 ivs = nla_data(vf); 1244 err = -EOPNOTSUPP; 1245 if (ops->ndo_set_vf_spoofchk) 1246 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1247 ivs->setting); 1248 break; 1249 } 1250 case IFLA_VF_LINK_STATE: { 1251 struct ifla_vf_link_state *ivl; 1252 ivl = nla_data(vf); 1253 err = -EOPNOTSUPP; 1254 if (ops->ndo_set_vf_link_state) 1255 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1256 ivl->link_state); 1257 break; 1258 } 1259 default: 1260 err = -EINVAL; 1261 break; 1262 } 1263 if (err) 1264 break; 1265 } 1266 return err; 1267 } 1268 1269 static int do_set_master(struct net_device *dev, int ifindex) 1270 { 1271 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1272 const struct net_device_ops *ops; 1273 int err; 1274 1275 if (upper_dev) { 1276 if (upper_dev->ifindex == ifindex) 1277 return 0; 1278 ops = upper_dev->netdev_ops; 1279 if (ops->ndo_del_slave) { 1280 err = ops->ndo_del_slave(upper_dev, dev); 1281 if (err) 1282 return err; 1283 } else { 1284 return -EOPNOTSUPP; 1285 } 1286 } 1287 1288 if (ifindex) { 1289 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1290 if (!upper_dev) 1291 return -EINVAL; 1292 ops = upper_dev->netdev_ops; 1293 if (ops->ndo_add_slave) { 1294 err = ops->ndo_add_slave(upper_dev, dev); 1295 if (err) 1296 return err; 1297 } else { 1298 return -EOPNOTSUPP; 1299 } 1300 } 1301 return 0; 1302 } 1303 1304 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1305 struct nlattr **tb, char *ifname, int modified) 1306 { 1307 const struct net_device_ops *ops = dev->netdev_ops; 1308 int err; 1309 1310 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1311 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1312 if (IS_ERR(net)) { 1313 err = PTR_ERR(net); 1314 goto errout; 1315 } 1316 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) { 1317 err = -EPERM; 1318 goto errout; 1319 } 1320 err = dev_change_net_namespace(dev, net, ifname); 1321 put_net(net); 1322 if (err) 1323 goto errout; 1324 modified = 1; 1325 } 1326 1327 if (tb[IFLA_MAP]) { 1328 struct rtnl_link_ifmap *u_map; 1329 struct ifmap k_map; 1330 1331 if (!ops->ndo_set_config) { 1332 err = -EOPNOTSUPP; 1333 goto errout; 1334 } 1335 1336 if (!netif_device_present(dev)) { 1337 err = -ENODEV; 1338 goto errout; 1339 } 1340 1341 u_map = nla_data(tb[IFLA_MAP]); 1342 k_map.mem_start = (unsigned long) u_map->mem_start; 1343 k_map.mem_end = (unsigned long) u_map->mem_end; 1344 k_map.base_addr = (unsigned short) u_map->base_addr; 1345 k_map.irq = (unsigned char) u_map->irq; 1346 k_map.dma = (unsigned char) u_map->dma; 1347 k_map.port = (unsigned char) u_map->port; 1348 1349 err = ops->ndo_set_config(dev, &k_map); 1350 if (err < 0) 1351 goto errout; 1352 1353 modified = 1; 1354 } 1355 1356 if (tb[IFLA_ADDRESS]) { 1357 struct sockaddr *sa; 1358 int len; 1359 1360 len = sizeof(sa_family_t) + dev->addr_len; 1361 sa = kmalloc(len, GFP_KERNEL); 1362 if (!sa) { 1363 err = -ENOMEM; 1364 goto errout; 1365 } 1366 sa->sa_family = dev->type; 1367 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1368 dev->addr_len); 1369 err = dev_set_mac_address(dev, sa); 1370 kfree(sa); 1371 if (err) 1372 goto errout; 1373 modified = 1; 1374 } 1375 1376 if (tb[IFLA_MTU]) { 1377 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1378 if (err < 0) 1379 goto errout; 1380 modified = 1; 1381 } 1382 1383 if (tb[IFLA_GROUP]) { 1384 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1385 modified = 1; 1386 } 1387 1388 /* 1389 * Interface selected by interface index but interface 1390 * name provided implies that a name change has been 1391 * requested. 1392 */ 1393 if (ifm->ifi_index > 0 && ifname[0]) { 1394 err = dev_change_name(dev, ifname); 1395 if (err < 0) 1396 goto errout; 1397 modified = 1; 1398 } 1399 1400 if (tb[IFLA_IFALIAS]) { 1401 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1402 nla_len(tb[IFLA_IFALIAS])); 1403 if (err < 0) 1404 goto errout; 1405 modified = 1; 1406 } 1407 1408 if (tb[IFLA_BROADCAST]) { 1409 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1410 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1411 } 1412 1413 if (ifm->ifi_flags || ifm->ifi_change) { 1414 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1415 if (err < 0) 1416 goto errout; 1417 } 1418 1419 if (tb[IFLA_MASTER]) { 1420 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1421 if (err) 1422 goto errout; 1423 modified = 1; 1424 } 1425 1426 if (tb[IFLA_CARRIER]) { 1427 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1428 if (err) 1429 goto errout; 1430 modified = 1; 1431 } 1432 1433 if (tb[IFLA_TXQLEN]) 1434 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1435 1436 if (tb[IFLA_OPERSTATE]) 1437 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1438 1439 if (tb[IFLA_LINKMODE]) { 1440 write_lock_bh(&dev_base_lock); 1441 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1442 write_unlock_bh(&dev_base_lock); 1443 } 1444 1445 if (tb[IFLA_VFINFO_LIST]) { 1446 struct nlattr *attr; 1447 int rem; 1448 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1449 if (nla_type(attr) != IFLA_VF_INFO) { 1450 err = -EINVAL; 1451 goto errout; 1452 } 1453 err = do_setvfinfo(dev, attr); 1454 if (err < 0) 1455 goto errout; 1456 modified = 1; 1457 } 1458 } 1459 err = 0; 1460 1461 if (tb[IFLA_VF_PORTS]) { 1462 struct nlattr *port[IFLA_PORT_MAX+1]; 1463 struct nlattr *attr; 1464 int vf; 1465 int rem; 1466 1467 err = -EOPNOTSUPP; 1468 if (!ops->ndo_set_vf_port) 1469 goto errout; 1470 1471 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1472 if (nla_type(attr) != IFLA_VF_PORT) 1473 continue; 1474 err = nla_parse_nested(port, IFLA_PORT_MAX, 1475 attr, ifla_port_policy); 1476 if (err < 0) 1477 goto errout; 1478 if (!port[IFLA_PORT_VF]) { 1479 err = -EOPNOTSUPP; 1480 goto errout; 1481 } 1482 vf = nla_get_u32(port[IFLA_PORT_VF]); 1483 err = ops->ndo_set_vf_port(dev, vf, port); 1484 if (err < 0) 1485 goto errout; 1486 modified = 1; 1487 } 1488 } 1489 err = 0; 1490 1491 if (tb[IFLA_PORT_SELF]) { 1492 struct nlattr *port[IFLA_PORT_MAX+1]; 1493 1494 err = nla_parse_nested(port, IFLA_PORT_MAX, 1495 tb[IFLA_PORT_SELF], ifla_port_policy); 1496 if (err < 0) 1497 goto errout; 1498 1499 err = -EOPNOTSUPP; 1500 if (ops->ndo_set_vf_port) 1501 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1502 if (err < 0) 1503 goto errout; 1504 modified = 1; 1505 } 1506 1507 if (tb[IFLA_AF_SPEC]) { 1508 struct nlattr *af; 1509 int rem; 1510 1511 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1512 const struct rtnl_af_ops *af_ops; 1513 1514 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1515 BUG(); 1516 1517 err = af_ops->set_link_af(dev, af); 1518 if (err < 0) 1519 goto errout; 1520 1521 modified = 1; 1522 } 1523 } 1524 err = 0; 1525 1526 errout: 1527 if (err < 0 && modified) 1528 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", 1529 dev->name); 1530 1531 return err; 1532 } 1533 1534 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1535 { 1536 struct net *net = sock_net(skb->sk); 1537 struct ifinfomsg *ifm; 1538 struct net_device *dev; 1539 int err; 1540 struct nlattr *tb[IFLA_MAX+1]; 1541 char ifname[IFNAMSIZ]; 1542 1543 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1544 if (err < 0) 1545 goto errout; 1546 1547 if (tb[IFLA_IFNAME]) 1548 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1549 else 1550 ifname[0] = '\0'; 1551 1552 err = -EINVAL; 1553 ifm = nlmsg_data(nlh); 1554 if (ifm->ifi_index > 0) 1555 dev = __dev_get_by_index(net, ifm->ifi_index); 1556 else if (tb[IFLA_IFNAME]) 1557 dev = __dev_get_by_name(net, ifname); 1558 else 1559 goto errout; 1560 1561 if (dev == NULL) { 1562 err = -ENODEV; 1563 goto errout; 1564 } 1565 1566 err = validate_linkmsg(dev, tb); 1567 if (err < 0) 1568 goto errout; 1569 1570 err = do_setlink(dev, ifm, tb, ifname, 0); 1571 errout: 1572 return err; 1573 } 1574 1575 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1576 { 1577 struct net *net = sock_net(skb->sk); 1578 const struct rtnl_link_ops *ops; 1579 struct net_device *dev; 1580 struct ifinfomsg *ifm; 1581 char ifname[IFNAMSIZ]; 1582 struct nlattr *tb[IFLA_MAX+1]; 1583 int err; 1584 LIST_HEAD(list_kill); 1585 1586 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1587 if (err < 0) 1588 return err; 1589 1590 if (tb[IFLA_IFNAME]) 1591 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1592 1593 ifm = nlmsg_data(nlh); 1594 if (ifm->ifi_index > 0) 1595 dev = __dev_get_by_index(net, ifm->ifi_index); 1596 else if (tb[IFLA_IFNAME]) 1597 dev = __dev_get_by_name(net, ifname); 1598 else 1599 return -EINVAL; 1600 1601 if (!dev) 1602 return -ENODEV; 1603 1604 ops = dev->rtnl_link_ops; 1605 if (!ops) 1606 return -EOPNOTSUPP; 1607 1608 ops->dellink(dev, &list_kill); 1609 unregister_netdevice_many(&list_kill); 1610 list_del(&list_kill); 1611 return 0; 1612 } 1613 1614 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1615 { 1616 unsigned int old_flags; 1617 int err; 1618 1619 old_flags = dev->flags; 1620 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1621 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1622 if (err < 0) 1623 return err; 1624 } 1625 1626 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1627 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1628 1629 __dev_notify_flags(dev, old_flags); 1630 return 0; 1631 } 1632 EXPORT_SYMBOL(rtnl_configure_link); 1633 1634 struct net_device *rtnl_create_link(struct net *net, 1635 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1636 { 1637 int err; 1638 struct net_device *dev; 1639 unsigned int num_tx_queues = 1; 1640 unsigned int num_rx_queues = 1; 1641 1642 if (tb[IFLA_NUM_TX_QUEUES]) 1643 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1644 else if (ops->get_num_tx_queues) 1645 num_tx_queues = ops->get_num_tx_queues(); 1646 1647 if (tb[IFLA_NUM_RX_QUEUES]) 1648 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1649 else if (ops->get_num_rx_queues) 1650 num_rx_queues = ops->get_num_rx_queues(); 1651 1652 err = -ENOMEM; 1653 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup, 1654 num_tx_queues, num_rx_queues); 1655 if (!dev) 1656 goto err; 1657 1658 dev_net_set(dev, net); 1659 dev->rtnl_link_ops = ops; 1660 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1661 1662 if (tb[IFLA_MTU]) 1663 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1664 if (tb[IFLA_ADDRESS]) { 1665 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1666 nla_len(tb[IFLA_ADDRESS])); 1667 dev->addr_assign_type = NET_ADDR_SET; 1668 } 1669 if (tb[IFLA_BROADCAST]) 1670 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1671 nla_len(tb[IFLA_BROADCAST])); 1672 if (tb[IFLA_TXQLEN]) 1673 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1674 if (tb[IFLA_OPERSTATE]) 1675 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1676 if (tb[IFLA_LINKMODE]) 1677 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1678 if (tb[IFLA_GROUP]) 1679 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1680 1681 return dev; 1682 1683 err: 1684 return ERR_PTR(err); 1685 } 1686 EXPORT_SYMBOL(rtnl_create_link); 1687 1688 static int rtnl_group_changelink(struct net *net, int group, 1689 struct ifinfomsg *ifm, 1690 struct nlattr **tb) 1691 { 1692 struct net_device *dev; 1693 int err; 1694 1695 for_each_netdev(net, dev) { 1696 if (dev->group == group) { 1697 err = do_setlink(dev, ifm, tb, NULL, 0); 1698 if (err < 0) 1699 return err; 1700 } 1701 } 1702 1703 return 0; 1704 } 1705 1706 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1707 { 1708 struct net *net = sock_net(skb->sk); 1709 const struct rtnl_link_ops *ops; 1710 struct net_device *dev; 1711 struct ifinfomsg *ifm; 1712 char kind[MODULE_NAME_LEN]; 1713 char ifname[IFNAMSIZ]; 1714 struct nlattr *tb[IFLA_MAX+1]; 1715 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1716 int err; 1717 1718 #ifdef CONFIG_MODULES 1719 replay: 1720 #endif 1721 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1722 if (err < 0) 1723 return err; 1724 1725 if (tb[IFLA_IFNAME]) 1726 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1727 else 1728 ifname[0] = '\0'; 1729 1730 ifm = nlmsg_data(nlh); 1731 if (ifm->ifi_index > 0) 1732 dev = __dev_get_by_index(net, ifm->ifi_index); 1733 else { 1734 if (ifname[0]) 1735 dev = __dev_get_by_name(net, ifname); 1736 else 1737 dev = NULL; 1738 } 1739 1740 err = validate_linkmsg(dev, tb); 1741 if (err < 0) 1742 return err; 1743 1744 if (tb[IFLA_LINKINFO]) { 1745 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1746 tb[IFLA_LINKINFO], ifla_info_policy); 1747 if (err < 0) 1748 return err; 1749 } else 1750 memset(linkinfo, 0, sizeof(linkinfo)); 1751 1752 if (linkinfo[IFLA_INFO_KIND]) { 1753 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1754 ops = rtnl_link_ops_get(kind); 1755 } else { 1756 kind[0] = '\0'; 1757 ops = NULL; 1758 } 1759 1760 if (1) { 1761 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1762 struct net *dest_net; 1763 1764 if (ops) { 1765 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1766 err = nla_parse_nested(attr, ops->maxtype, 1767 linkinfo[IFLA_INFO_DATA], 1768 ops->policy); 1769 if (err < 0) 1770 return err; 1771 data = attr; 1772 } 1773 if (ops->validate) { 1774 err = ops->validate(tb, data); 1775 if (err < 0) 1776 return err; 1777 } 1778 } 1779 1780 if (dev) { 1781 int modified = 0; 1782 1783 if (nlh->nlmsg_flags & NLM_F_EXCL) 1784 return -EEXIST; 1785 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1786 return -EOPNOTSUPP; 1787 1788 if (linkinfo[IFLA_INFO_DATA]) { 1789 if (!ops || ops != dev->rtnl_link_ops || 1790 !ops->changelink) 1791 return -EOPNOTSUPP; 1792 1793 err = ops->changelink(dev, tb, data); 1794 if (err < 0) 1795 return err; 1796 modified = 1; 1797 } 1798 1799 return do_setlink(dev, ifm, tb, ifname, modified); 1800 } 1801 1802 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1803 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1804 return rtnl_group_changelink(net, 1805 nla_get_u32(tb[IFLA_GROUP]), 1806 ifm, tb); 1807 return -ENODEV; 1808 } 1809 1810 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1811 return -EOPNOTSUPP; 1812 1813 if (!ops) { 1814 #ifdef CONFIG_MODULES 1815 if (kind[0]) { 1816 __rtnl_unlock(); 1817 request_module("rtnl-link-%s", kind); 1818 rtnl_lock(); 1819 ops = rtnl_link_ops_get(kind); 1820 if (ops) 1821 goto replay; 1822 } 1823 #endif 1824 return -EOPNOTSUPP; 1825 } 1826 1827 if (!ifname[0]) 1828 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1829 1830 dest_net = rtnl_link_get_net(net, tb); 1831 if (IS_ERR(dest_net)) 1832 return PTR_ERR(dest_net); 1833 1834 dev = rtnl_create_link(dest_net, ifname, ops, tb); 1835 if (IS_ERR(dev)) { 1836 err = PTR_ERR(dev); 1837 goto out; 1838 } 1839 1840 dev->ifindex = ifm->ifi_index; 1841 1842 if (ops->newlink) 1843 err = ops->newlink(net, dev, tb, data); 1844 else 1845 err = register_netdevice(dev); 1846 1847 if (err < 0 && !IS_ERR(dev)) 1848 free_netdev(dev); 1849 if (err < 0) 1850 goto out; 1851 1852 err = rtnl_configure_link(dev, ifm); 1853 if (err < 0) 1854 unregister_netdevice(dev); 1855 out: 1856 put_net(dest_net); 1857 return err; 1858 } 1859 } 1860 1861 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 1862 { 1863 struct net *net = sock_net(skb->sk); 1864 struct ifinfomsg *ifm; 1865 char ifname[IFNAMSIZ]; 1866 struct nlattr *tb[IFLA_MAX+1]; 1867 struct net_device *dev = NULL; 1868 struct sk_buff *nskb; 1869 int err; 1870 u32 ext_filter_mask = 0; 1871 1872 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1873 if (err < 0) 1874 return err; 1875 1876 if (tb[IFLA_IFNAME]) 1877 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1878 1879 if (tb[IFLA_EXT_MASK]) 1880 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1881 1882 ifm = nlmsg_data(nlh); 1883 if (ifm->ifi_index > 0) 1884 dev = __dev_get_by_index(net, ifm->ifi_index); 1885 else if (tb[IFLA_IFNAME]) 1886 dev = __dev_get_by_name(net, ifname); 1887 else 1888 return -EINVAL; 1889 1890 if (dev == NULL) 1891 return -ENODEV; 1892 1893 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1894 if (nskb == NULL) 1895 return -ENOBUFS; 1896 1897 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 1898 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1899 if (err < 0) { 1900 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1901 WARN_ON(err == -EMSGSIZE); 1902 kfree_skb(nskb); 1903 } else 1904 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 1905 1906 return err; 1907 } 1908 1909 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1910 { 1911 struct net *net = sock_net(skb->sk); 1912 struct net_device *dev; 1913 struct nlattr *tb[IFLA_MAX+1]; 1914 u32 ext_filter_mask = 0; 1915 u16 min_ifinfo_dump_size = 0; 1916 1917 if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 1918 ifla_policy) >= 0) { 1919 if (tb[IFLA_EXT_MASK]) 1920 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1921 } 1922 1923 if (!ext_filter_mask) 1924 return NLMSG_GOODSIZE; 1925 /* 1926 * traverse the list of net devices and compute the minimum 1927 * buffer size based upon the filter mask. 1928 */ 1929 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1930 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1931 if_nlmsg_size(dev, 1932 ext_filter_mask)); 1933 } 1934 1935 return min_ifinfo_dump_size; 1936 } 1937 1938 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1939 { 1940 int idx; 1941 int s_idx = cb->family; 1942 1943 if (s_idx == 0) 1944 s_idx = 1; 1945 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1946 int type = cb->nlh->nlmsg_type-RTM_BASE; 1947 if (idx < s_idx || idx == PF_PACKET) 1948 continue; 1949 if (rtnl_msg_handlers[idx] == NULL || 1950 rtnl_msg_handlers[idx][type].dumpit == NULL) 1951 continue; 1952 if (idx > s_idx) { 1953 memset(&cb->args[0], 0, sizeof(cb->args)); 1954 cb->prev_seq = 0; 1955 cb->seq = 0; 1956 } 1957 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1958 break; 1959 } 1960 cb->family = idx; 1961 1962 return skb->len; 1963 } 1964 1965 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change) 1966 { 1967 struct net *net = dev_net(dev); 1968 struct sk_buff *skb; 1969 int err = -ENOBUFS; 1970 size_t if_info_size; 1971 1972 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL); 1973 if (skb == NULL) 1974 goto errout; 1975 1976 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 1977 if (err < 0) { 1978 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1979 WARN_ON(err == -EMSGSIZE); 1980 kfree_skb(skb); 1981 goto errout; 1982 } 1983 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1984 return; 1985 errout: 1986 if (err < 0) 1987 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1988 } 1989 EXPORT_SYMBOL(rtmsg_ifinfo); 1990 1991 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 1992 struct net_device *dev, 1993 u8 *addr, u32 pid, u32 seq, 1994 int type, unsigned int flags) 1995 { 1996 struct nlmsghdr *nlh; 1997 struct ndmsg *ndm; 1998 1999 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI); 2000 if (!nlh) 2001 return -EMSGSIZE; 2002 2003 ndm = nlmsg_data(nlh); 2004 ndm->ndm_family = AF_BRIDGE; 2005 ndm->ndm_pad1 = 0; 2006 ndm->ndm_pad2 = 0; 2007 ndm->ndm_flags = flags; 2008 ndm->ndm_type = 0; 2009 ndm->ndm_ifindex = dev->ifindex; 2010 ndm->ndm_state = NUD_PERMANENT; 2011 2012 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2013 goto nla_put_failure; 2014 2015 return nlmsg_end(skb, nlh); 2016 2017 nla_put_failure: 2018 nlmsg_cancel(skb, nlh); 2019 return -EMSGSIZE; 2020 } 2021 2022 static inline size_t rtnl_fdb_nlmsg_size(void) 2023 { 2024 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2025 } 2026 2027 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2028 { 2029 struct net *net = dev_net(dev); 2030 struct sk_buff *skb; 2031 int err = -ENOBUFS; 2032 2033 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2034 if (!skb) 2035 goto errout; 2036 2037 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF); 2038 if (err < 0) { 2039 kfree_skb(skb); 2040 goto errout; 2041 } 2042 2043 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2044 return; 2045 errout: 2046 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2047 } 2048 2049 /** 2050 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2051 */ 2052 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2053 struct nlattr *tb[], 2054 struct net_device *dev, 2055 const unsigned char *addr, 2056 u16 flags) 2057 { 2058 int err = -EINVAL; 2059 2060 /* If aging addresses are supported device will need to 2061 * implement its own handler for this. 2062 */ 2063 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2064 pr_info("%s: FDB only supports static addresses\n", dev->name); 2065 return err; 2066 } 2067 2068 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2069 err = dev_uc_add_excl(dev, addr); 2070 else if (is_multicast_ether_addr(addr)) 2071 err = dev_mc_add_excl(dev, addr); 2072 2073 /* Only return duplicate errors if NLM_F_EXCL is set */ 2074 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2075 err = 0; 2076 2077 return err; 2078 } 2079 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2080 2081 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2082 { 2083 struct net *net = sock_net(skb->sk); 2084 struct ndmsg *ndm; 2085 struct nlattr *tb[NDA_MAX+1]; 2086 struct net_device *dev; 2087 u8 *addr; 2088 int err; 2089 2090 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2091 if (err < 0) 2092 return err; 2093 2094 ndm = nlmsg_data(nlh); 2095 if (ndm->ndm_ifindex == 0) { 2096 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2097 return -EINVAL; 2098 } 2099 2100 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2101 if (dev == NULL) { 2102 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2103 return -ENODEV; 2104 } 2105 2106 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2107 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2108 return -EINVAL; 2109 } 2110 2111 addr = nla_data(tb[NDA_LLADDR]); 2112 2113 err = -EOPNOTSUPP; 2114 2115 /* Support fdb on master device the net/bridge default case */ 2116 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2117 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2118 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2119 const struct net_device_ops *ops = br_dev->netdev_ops; 2120 2121 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags); 2122 if (err) 2123 goto out; 2124 else 2125 ndm->ndm_flags &= ~NTF_MASTER; 2126 } 2127 2128 /* Embedded bridge, macvlan, and any other device support */ 2129 if ((ndm->ndm_flags & NTF_SELF)) { 2130 if (dev->netdev_ops->ndo_fdb_add) 2131 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2132 nlh->nlmsg_flags); 2133 else 2134 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, 2135 nlh->nlmsg_flags); 2136 2137 if (!err) { 2138 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2139 ndm->ndm_flags &= ~NTF_SELF; 2140 } 2141 } 2142 out: 2143 return err; 2144 } 2145 2146 /** 2147 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2148 */ 2149 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2150 struct nlattr *tb[], 2151 struct net_device *dev, 2152 const unsigned char *addr) 2153 { 2154 int err = -EOPNOTSUPP; 2155 2156 /* If aging addresses are supported device will need to 2157 * implement its own handler for this. 2158 */ 2159 if (ndm->ndm_state & NUD_PERMANENT) { 2160 pr_info("%s: FDB only supports static addresses\n", dev->name); 2161 return -EINVAL; 2162 } 2163 2164 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2165 err = dev_uc_del(dev, addr); 2166 else if (is_multicast_ether_addr(addr)) 2167 err = dev_mc_del(dev, addr); 2168 else 2169 err = -EINVAL; 2170 2171 return err; 2172 } 2173 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2174 2175 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2176 { 2177 struct net *net = sock_net(skb->sk); 2178 struct ndmsg *ndm; 2179 struct nlattr *tb[NDA_MAX+1]; 2180 struct net_device *dev; 2181 int err = -EINVAL; 2182 __u8 *addr; 2183 2184 if (!capable(CAP_NET_ADMIN)) 2185 return -EPERM; 2186 2187 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2188 if (err < 0) 2189 return err; 2190 2191 ndm = nlmsg_data(nlh); 2192 if (ndm->ndm_ifindex == 0) { 2193 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2194 return -EINVAL; 2195 } 2196 2197 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2198 if (dev == NULL) { 2199 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2200 return -ENODEV; 2201 } 2202 2203 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2204 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2205 return -EINVAL; 2206 } 2207 2208 addr = nla_data(tb[NDA_LLADDR]); 2209 2210 err = -EOPNOTSUPP; 2211 2212 /* Support fdb on master device the net/bridge default case */ 2213 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2214 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2215 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2216 const struct net_device_ops *ops = br_dev->netdev_ops; 2217 2218 if (ops->ndo_fdb_del) 2219 err = ops->ndo_fdb_del(ndm, tb, dev, addr); 2220 2221 if (err) 2222 goto out; 2223 else 2224 ndm->ndm_flags &= ~NTF_MASTER; 2225 } 2226 2227 /* Embedded bridge, macvlan, and any other device support */ 2228 if (ndm->ndm_flags & NTF_SELF) { 2229 if (dev->netdev_ops->ndo_fdb_del) 2230 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr); 2231 else 2232 err = ndo_dflt_fdb_del(ndm, tb, dev, addr); 2233 2234 if (!err) { 2235 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2236 ndm->ndm_flags &= ~NTF_SELF; 2237 } 2238 } 2239 out: 2240 return err; 2241 } 2242 2243 static int nlmsg_populate_fdb(struct sk_buff *skb, 2244 struct netlink_callback *cb, 2245 struct net_device *dev, 2246 int *idx, 2247 struct netdev_hw_addr_list *list) 2248 { 2249 struct netdev_hw_addr *ha; 2250 int err; 2251 u32 portid, seq; 2252 2253 portid = NETLINK_CB(cb->skb).portid; 2254 seq = cb->nlh->nlmsg_seq; 2255 2256 list_for_each_entry(ha, &list->list, list) { 2257 if (*idx < cb->args[0]) 2258 goto skip; 2259 2260 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2261 portid, seq, 2262 RTM_NEWNEIGH, NTF_SELF); 2263 if (err < 0) 2264 return err; 2265 skip: 2266 *idx += 1; 2267 } 2268 return 0; 2269 } 2270 2271 /** 2272 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2273 * @nlh: netlink message header 2274 * @dev: netdevice 2275 * 2276 * Default netdevice operation to dump the existing unicast address list. 2277 * Returns number of addresses from list put in skb. 2278 */ 2279 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2280 struct netlink_callback *cb, 2281 struct net_device *dev, 2282 int idx) 2283 { 2284 int err; 2285 2286 netif_addr_lock_bh(dev); 2287 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2288 if (err) 2289 goto out; 2290 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2291 out: 2292 netif_addr_unlock_bh(dev); 2293 return idx; 2294 } 2295 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2296 2297 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2298 { 2299 int idx = 0; 2300 struct net *net = sock_net(skb->sk); 2301 struct net_device *dev; 2302 2303 rcu_read_lock(); 2304 for_each_netdev_rcu(net, dev) { 2305 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2306 struct net_device *br_dev; 2307 const struct net_device_ops *ops; 2308 2309 br_dev = netdev_master_upper_dev_get(dev); 2310 ops = br_dev->netdev_ops; 2311 if (ops->ndo_fdb_dump) 2312 idx = ops->ndo_fdb_dump(skb, cb, dev, idx); 2313 } 2314 2315 if (dev->netdev_ops->ndo_fdb_dump) 2316 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx); 2317 else 2318 idx = ndo_dflt_fdb_dump(skb, cb, dev, idx); 2319 } 2320 rcu_read_unlock(); 2321 2322 cb->args[0] = idx; 2323 return skb->len; 2324 } 2325 2326 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2327 struct net_device *dev, u16 mode) 2328 { 2329 struct nlmsghdr *nlh; 2330 struct ifinfomsg *ifm; 2331 struct nlattr *br_afspec; 2332 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2333 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2334 2335 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); 2336 if (nlh == NULL) 2337 return -EMSGSIZE; 2338 2339 ifm = nlmsg_data(nlh); 2340 ifm->ifi_family = AF_BRIDGE; 2341 ifm->__ifi_pad = 0; 2342 ifm->ifi_type = dev->type; 2343 ifm->ifi_index = dev->ifindex; 2344 ifm->ifi_flags = dev_get_flags(dev); 2345 ifm->ifi_change = 0; 2346 2347 2348 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2349 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2350 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2351 (br_dev && 2352 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2353 (dev->addr_len && 2354 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2355 (dev->ifindex != dev->iflink && 2356 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 2357 goto nla_put_failure; 2358 2359 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2360 if (!br_afspec) 2361 goto nla_put_failure; 2362 2363 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) || 2364 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2365 nla_nest_cancel(skb, br_afspec); 2366 goto nla_put_failure; 2367 } 2368 nla_nest_end(skb, br_afspec); 2369 2370 return nlmsg_end(skb, nlh); 2371 nla_put_failure: 2372 nlmsg_cancel(skb, nlh); 2373 return -EMSGSIZE; 2374 } 2375 EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2376 2377 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2378 { 2379 struct net *net = sock_net(skb->sk); 2380 struct net_device *dev; 2381 int idx = 0; 2382 u32 portid = NETLINK_CB(cb->skb).portid; 2383 u32 seq = cb->nlh->nlmsg_seq; 2384 struct nlattr *extfilt; 2385 u32 filter_mask = 0; 2386 2387 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct rtgenmsg), 2388 IFLA_EXT_MASK); 2389 if (extfilt) 2390 filter_mask = nla_get_u32(extfilt); 2391 2392 rcu_read_lock(); 2393 for_each_netdev_rcu(net, dev) { 2394 const struct net_device_ops *ops = dev->netdev_ops; 2395 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2396 2397 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2398 if (idx >= cb->args[0] && 2399 br_dev->netdev_ops->ndo_bridge_getlink( 2400 skb, portid, seq, dev, filter_mask) < 0) 2401 break; 2402 idx++; 2403 } 2404 2405 if (ops->ndo_bridge_getlink) { 2406 if (idx >= cb->args[0] && 2407 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2408 filter_mask) < 0) 2409 break; 2410 idx++; 2411 } 2412 } 2413 rcu_read_unlock(); 2414 cb->args[0] = idx; 2415 2416 return skb->len; 2417 } 2418 2419 static inline size_t bridge_nlmsg_size(void) 2420 { 2421 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2422 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 2423 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 2424 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 2425 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 2426 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 2427 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 2428 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 2429 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 2430 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 2431 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 2432 } 2433 2434 static int rtnl_bridge_notify(struct net_device *dev, u16 flags) 2435 { 2436 struct net *net = dev_net(dev); 2437 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2438 struct sk_buff *skb; 2439 int err = -EOPNOTSUPP; 2440 2441 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 2442 if (!skb) { 2443 err = -ENOMEM; 2444 goto errout; 2445 } 2446 2447 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) && 2448 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2449 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2450 if (err < 0) 2451 goto errout; 2452 } 2453 2454 if ((flags & BRIDGE_FLAGS_SELF) && 2455 dev->netdev_ops->ndo_bridge_getlink) { 2456 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2457 if (err < 0) 2458 goto errout; 2459 } 2460 2461 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 2462 return 0; 2463 errout: 2464 WARN_ON(err == -EMSGSIZE); 2465 kfree_skb(skb); 2466 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2467 return err; 2468 } 2469 2470 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2471 { 2472 struct net *net = sock_net(skb->sk); 2473 struct ifinfomsg *ifm; 2474 struct net_device *dev; 2475 struct nlattr *br_spec, *attr = NULL; 2476 int rem, err = -EOPNOTSUPP; 2477 u16 oflags, flags = 0; 2478 bool have_flags = false; 2479 2480 if (nlmsg_len(nlh) < sizeof(*ifm)) 2481 return -EINVAL; 2482 2483 ifm = nlmsg_data(nlh); 2484 if (ifm->ifi_family != AF_BRIDGE) 2485 return -EPFNOSUPPORT; 2486 2487 dev = __dev_get_by_index(net, ifm->ifi_index); 2488 if (!dev) { 2489 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2490 return -ENODEV; 2491 } 2492 2493 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2494 if (br_spec) { 2495 nla_for_each_nested(attr, br_spec, rem) { 2496 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2497 have_flags = true; 2498 flags = nla_get_u16(attr); 2499 break; 2500 } 2501 } 2502 } 2503 2504 oflags = flags; 2505 2506 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2507 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2508 2509 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 2510 err = -EOPNOTSUPP; 2511 goto out; 2512 } 2513 2514 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2515 if (err) 2516 goto out; 2517 2518 flags &= ~BRIDGE_FLAGS_MASTER; 2519 } 2520 2521 if ((flags & BRIDGE_FLAGS_SELF)) { 2522 if (!dev->netdev_ops->ndo_bridge_setlink) 2523 err = -EOPNOTSUPP; 2524 else 2525 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2526 2527 if (!err) 2528 flags &= ~BRIDGE_FLAGS_SELF; 2529 } 2530 2531 if (have_flags) 2532 memcpy(nla_data(attr), &flags, sizeof(flags)); 2533 /* Generate event to notify upper layer of bridge change */ 2534 if (!err) 2535 err = rtnl_bridge_notify(dev, oflags); 2536 out: 2537 return err; 2538 } 2539 2540 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2541 { 2542 struct net *net = sock_net(skb->sk); 2543 struct ifinfomsg *ifm; 2544 struct net_device *dev; 2545 struct nlattr *br_spec, *attr = NULL; 2546 int rem, err = -EOPNOTSUPP; 2547 u16 oflags, flags = 0; 2548 bool have_flags = false; 2549 2550 if (nlmsg_len(nlh) < sizeof(*ifm)) 2551 return -EINVAL; 2552 2553 ifm = nlmsg_data(nlh); 2554 if (ifm->ifi_family != AF_BRIDGE) 2555 return -EPFNOSUPPORT; 2556 2557 dev = __dev_get_by_index(net, ifm->ifi_index); 2558 if (!dev) { 2559 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2560 return -ENODEV; 2561 } 2562 2563 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2564 if (br_spec) { 2565 nla_for_each_nested(attr, br_spec, rem) { 2566 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2567 have_flags = true; 2568 flags = nla_get_u16(attr); 2569 break; 2570 } 2571 } 2572 } 2573 2574 oflags = flags; 2575 2576 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2577 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2578 2579 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 2580 err = -EOPNOTSUPP; 2581 goto out; 2582 } 2583 2584 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2585 if (err) 2586 goto out; 2587 2588 flags &= ~BRIDGE_FLAGS_MASTER; 2589 } 2590 2591 if ((flags & BRIDGE_FLAGS_SELF)) { 2592 if (!dev->netdev_ops->ndo_bridge_dellink) 2593 err = -EOPNOTSUPP; 2594 else 2595 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2596 2597 if (!err) 2598 flags &= ~BRIDGE_FLAGS_SELF; 2599 } 2600 2601 if (have_flags) 2602 memcpy(nla_data(attr), &flags, sizeof(flags)); 2603 /* Generate event to notify upper layer of bridge change */ 2604 if (!err) 2605 err = rtnl_bridge_notify(dev, oflags); 2606 out: 2607 return err; 2608 } 2609 2610 /* Process one rtnetlink message. */ 2611 2612 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2613 { 2614 struct net *net = sock_net(skb->sk); 2615 rtnl_doit_func doit; 2616 int sz_idx, kind; 2617 int family; 2618 int type; 2619 int err; 2620 2621 type = nlh->nlmsg_type; 2622 if (type > RTM_MAX) 2623 return -EOPNOTSUPP; 2624 2625 type -= RTM_BASE; 2626 2627 /* All the messages must have at least 1 byte length */ 2628 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 2629 return 0; 2630 2631 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 2632 sz_idx = type>>2; 2633 kind = type&3; 2634 2635 if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN)) 2636 return -EPERM; 2637 2638 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2639 struct sock *rtnl; 2640 rtnl_dumpit_func dumpit; 2641 rtnl_calcit_func calcit; 2642 u16 min_dump_alloc = 0; 2643 2644 dumpit = rtnl_get_dumpit(family, type); 2645 if (dumpit == NULL) 2646 return -EOPNOTSUPP; 2647 calcit = rtnl_get_calcit(family, type); 2648 if (calcit) 2649 min_dump_alloc = calcit(skb, nlh); 2650 2651 __rtnl_unlock(); 2652 rtnl = net->rtnl; 2653 { 2654 struct netlink_dump_control c = { 2655 .dump = dumpit, 2656 .min_dump_alloc = min_dump_alloc, 2657 }; 2658 err = netlink_dump_start(rtnl, skb, nlh, &c); 2659 } 2660 rtnl_lock(); 2661 return err; 2662 } 2663 2664 doit = rtnl_get_doit(family, type); 2665 if (doit == NULL) 2666 return -EOPNOTSUPP; 2667 2668 return doit(skb, nlh); 2669 } 2670 2671 static void rtnetlink_rcv(struct sk_buff *skb) 2672 { 2673 rtnl_lock(); 2674 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2675 rtnl_unlock(); 2676 } 2677 2678 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2679 { 2680 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2681 2682 switch (event) { 2683 case NETDEV_UP: 2684 case NETDEV_DOWN: 2685 case NETDEV_PRE_UP: 2686 case NETDEV_POST_INIT: 2687 case NETDEV_REGISTER: 2688 case NETDEV_CHANGE: 2689 case NETDEV_PRE_TYPE_CHANGE: 2690 case NETDEV_GOING_DOWN: 2691 case NETDEV_UNREGISTER: 2692 case NETDEV_UNREGISTER_FINAL: 2693 case NETDEV_RELEASE: 2694 case NETDEV_JOIN: 2695 break; 2696 default: 2697 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2698 break; 2699 } 2700 return NOTIFY_DONE; 2701 } 2702 2703 static struct notifier_block rtnetlink_dev_notifier = { 2704 .notifier_call = rtnetlink_event, 2705 }; 2706 2707 2708 static int __net_init rtnetlink_net_init(struct net *net) 2709 { 2710 struct sock *sk; 2711 struct netlink_kernel_cfg cfg = { 2712 .groups = RTNLGRP_MAX, 2713 .input = rtnetlink_rcv, 2714 .cb_mutex = &rtnl_mutex, 2715 .flags = NL_CFG_F_NONROOT_RECV, 2716 }; 2717 2718 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 2719 if (!sk) 2720 return -ENOMEM; 2721 net->rtnl = sk; 2722 return 0; 2723 } 2724 2725 static void __net_exit rtnetlink_net_exit(struct net *net) 2726 { 2727 netlink_kernel_release(net->rtnl); 2728 net->rtnl = NULL; 2729 } 2730 2731 static struct pernet_operations rtnetlink_net_ops = { 2732 .init = rtnetlink_net_init, 2733 .exit = rtnetlink_net_exit, 2734 }; 2735 2736 void __init rtnetlink_init(void) 2737 { 2738 if (register_pernet_subsys(&rtnetlink_net_ops)) 2739 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2740 2741 register_netdevice_notifier(&rtnetlink_dev_notifier); 2742 2743 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2744 rtnl_dump_ifinfo, rtnl_calcit); 2745 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2746 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2747 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2748 2749 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2750 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2751 2752 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 2753 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 2754 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 2755 2756 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 2757 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 2758 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 2759 } 2760 2761