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 + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */ 772 } 773 774 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 775 { 776 struct nlattr *vf_ports; 777 struct nlattr *vf_port; 778 int vf; 779 int err; 780 781 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 782 if (!vf_ports) 783 return -EMSGSIZE; 784 785 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 786 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 787 if (!vf_port) 788 goto nla_put_failure; 789 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 790 goto nla_put_failure; 791 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 792 if (err == -EMSGSIZE) 793 goto nla_put_failure; 794 if (err) { 795 nla_nest_cancel(skb, vf_port); 796 continue; 797 } 798 nla_nest_end(skb, vf_port); 799 } 800 801 nla_nest_end(skb, vf_ports); 802 803 return 0; 804 805 nla_put_failure: 806 nla_nest_cancel(skb, vf_ports); 807 return -EMSGSIZE; 808 } 809 810 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 811 { 812 struct nlattr *port_self; 813 int err; 814 815 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 816 if (!port_self) 817 return -EMSGSIZE; 818 819 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 820 if (err) { 821 nla_nest_cancel(skb, port_self); 822 return (err == -EMSGSIZE) ? err : 0; 823 } 824 825 nla_nest_end(skb, port_self); 826 827 return 0; 828 } 829 830 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 831 { 832 int err; 833 834 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 835 return 0; 836 837 err = rtnl_port_self_fill(skb, dev); 838 if (err) 839 return err; 840 841 if (dev_num_vf(dev->dev.parent)) { 842 err = rtnl_vf_ports_fill(skb, dev); 843 if (err) 844 return err; 845 } 846 847 return 0; 848 } 849 850 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev) 851 { 852 int err; 853 struct netdev_phys_port_id ppid; 854 855 err = dev_get_phys_port_id(dev, &ppid); 856 if (err) { 857 if (err == -EOPNOTSUPP) 858 return 0; 859 return err; 860 } 861 862 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id)) 863 return -EMSGSIZE; 864 865 return 0; 866 } 867 868 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 869 int type, u32 pid, u32 seq, u32 change, 870 unsigned int flags, u32 ext_filter_mask) 871 { 872 struct ifinfomsg *ifm; 873 struct nlmsghdr *nlh; 874 struct rtnl_link_stats64 temp; 875 const struct rtnl_link_stats64 *stats; 876 struct nlattr *attr, *af_spec; 877 struct rtnl_af_ops *af_ops; 878 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 879 880 ASSERT_RTNL(); 881 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 882 if (nlh == NULL) 883 return -EMSGSIZE; 884 885 ifm = nlmsg_data(nlh); 886 ifm->ifi_family = AF_UNSPEC; 887 ifm->__ifi_pad = 0; 888 ifm->ifi_type = dev->type; 889 ifm->ifi_index = dev->ifindex; 890 ifm->ifi_flags = dev_get_flags(dev); 891 ifm->ifi_change = change; 892 893 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 894 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 895 nla_put_u8(skb, IFLA_OPERSTATE, 896 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 897 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 898 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 899 nla_put_u32(skb, IFLA_GROUP, dev->group) || 900 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 901 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 902 #ifdef CONFIG_RPS 903 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 904 #endif 905 (dev->ifindex != dev->iflink && 906 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 907 (upper_dev && 908 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 909 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 910 (dev->qdisc && 911 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 912 (dev->ifalias && 913 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias))) 914 goto nla_put_failure; 915 916 if (1) { 917 struct rtnl_link_ifmap map = { 918 .mem_start = dev->mem_start, 919 .mem_end = dev->mem_end, 920 .base_addr = dev->base_addr, 921 .irq = dev->irq, 922 .dma = dev->dma, 923 .port = dev->if_port, 924 }; 925 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 926 goto nla_put_failure; 927 } 928 929 if (dev->addr_len) { 930 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 931 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 932 goto nla_put_failure; 933 } 934 935 if (rtnl_phys_port_id_fill(skb, dev)) 936 goto nla_put_failure; 937 938 attr = nla_reserve(skb, IFLA_STATS, 939 sizeof(struct rtnl_link_stats)); 940 if (attr == NULL) 941 goto nla_put_failure; 942 943 stats = dev_get_stats(dev, &temp); 944 copy_rtnl_link_stats(nla_data(attr), stats); 945 946 attr = nla_reserve(skb, IFLA_STATS64, 947 sizeof(struct rtnl_link_stats64)); 948 if (attr == NULL) 949 goto nla_put_failure; 950 copy_rtnl_link_stats64(nla_data(attr), stats); 951 952 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 953 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 954 goto nla_put_failure; 955 956 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 957 && (ext_filter_mask & RTEXT_FILTER_VF)) { 958 int i; 959 960 struct nlattr *vfinfo, *vf; 961 int num_vfs = dev_num_vf(dev->dev.parent); 962 963 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 964 if (!vfinfo) 965 goto nla_put_failure; 966 for (i = 0; i < num_vfs; i++) { 967 struct ifla_vf_info ivi; 968 struct ifla_vf_mac vf_mac; 969 struct ifla_vf_vlan vf_vlan; 970 struct ifla_vf_tx_rate vf_tx_rate; 971 struct ifla_vf_spoofchk vf_spoofchk; 972 struct ifla_vf_link_state vf_linkstate; 973 974 /* 975 * Not all SR-IOV capable drivers support the 976 * spoofcheck query. Preset to -1 so the user 977 * space tool can detect that the driver didn't 978 * report anything. 979 */ 980 ivi.spoofchk = -1; 981 memset(ivi.mac, 0, sizeof(ivi.mac)); 982 /* The default value for VF link state is "auto" 983 * IFLA_VF_LINK_STATE_AUTO which equals zero 984 */ 985 ivi.linkstate = 0; 986 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 987 break; 988 vf_mac.vf = 989 vf_vlan.vf = 990 vf_tx_rate.vf = 991 vf_spoofchk.vf = 992 vf_linkstate.vf = ivi.vf; 993 994 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 995 vf_vlan.vlan = ivi.vlan; 996 vf_vlan.qos = ivi.qos; 997 vf_tx_rate.rate = ivi.tx_rate; 998 vf_spoofchk.setting = ivi.spoofchk; 999 vf_linkstate.link_state = ivi.linkstate; 1000 vf = nla_nest_start(skb, IFLA_VF_INFO); 1001 if (!vf) { 1002 nla_nest_cancel(skb, vfinfo); 1003 goto nla_put_failure; 1004 } 1005 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 1006 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 1007 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 1008 &vf_tx_rate) || 1009 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1010 &vf_spoofchk) || 1011 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate), 1012 &vf_linkstate)) 1013 goto nla_put_failure; 1014 nla_nest_end(skb, vf); 1015 } 1016 nla_nest_end(skb, vfinfo); 1017 } 1018 1019 if (rtnl_port_fill(skb, dev)) 1020 goto nla_put_failure; 1021 1022 if (dev->rtnl_link_ops) { 1023 if (rtnl_link_fill(skb, dev) < 0) 1024 goto nla_put_failure; 1025 } 1026 1027 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1028 goto nla_put_failure; 1029 1030 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1031 if (af_ops->fill_link_af) { 1032 struct nlattr *af; 1033 int err; 1034 1035 if (!(af = nla_nest_start(skb, af_ops->family))) 1036 goto nla_put_failure; 1037 1038 err = af_ops->fill_link_af(skb, dev); 1039 1040 /* 1041 * Caller may return ENODATA to indicate that there 1042 * was no data to be dumped. This is not an error, it 1043 * means we should trim the attribute header and 1044 * continue. 1045 */ 1046 if (err == -ENODATA) 1047 nla_nest_cancel(skb, af); 1048 else if (err < 0) 1049 goto nla_put_failure; 1050 1051 nla_nest_end(skb, af); 1052 } 1053 } 1054 1055 nla_nest_end(skb, af_spec); 1056 1057 return nlmsg_end(skb, nlh); 1058 1059 nla_put_failure: 1060 nlmsg_cancel(skb, nlh); 1061 return -EMSGSIZE; 1062 } 1063 1064 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1065 { 1066 struct net *net = sock_net(skb->sk); 1067 int h, s_h; 1068 int idx = 0, s_idx; 1069 struct net_device *dev; 1070 struct hlist_head *head; 1071 struct nlattr *tb[IFLA_MAX+1]; 1072 u32 ext_filter_mask = 0; 1073 1074 s_h = cb->args[0]; 1075 s_idx = cb->args[1]; 1076 1077 rcu_read_lock(); 1078 cb->seq = net->dev_base_seq; 1079 1080 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 1081 ifla_policy) >= 0) { 1082 1083 if (tb[IFLA_EXT_MASK]) 1084 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1085 } 1086 1087 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1088 idx = 0; 1089 head = &net->dev_index_head[h]; 1090 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1091 if (idx < s_idx) 1092 goto cont; 1093 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1094 NETLINK_CB(cb->skb).portid, 1095 cb->nlh->nlmsg_seq, 0, 1096 NLM_F_MULTI, 1097 ext_filter_mask) <= 0) 1098 goto out; 1099 1100 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1101 cont: 1102 idx++; 1103 } 1104 } 1105 out: 1106 rcu_read_unlock(); 1107 cb->args[1] = idx; 1108 cb->args[0] = h; 1109 1110 return skb->len; 1111 } 1112 1113 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1114 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1115 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1116 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1117 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1118 [IFLA_MTU] = { .type = NLA_U32 }, 1119 [IFLA_LINK] = { .type = NLA_U32 }, 1120 [IFLA_MASTER] = { .type = NLA_U32 }, 1121 [IFLA_CARRIER] = { .type = NLA_U8 }, 1122 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1123 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1124 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1125 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1126 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1127 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1128 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1129 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1130 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1131 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1132 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1133 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1134 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1135 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1136 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1137 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1138 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN }, 1139 }; 1140 EXPORT_SYMBOL(ifla_policy); 1141 1142 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1143 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1144 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1145 }; 1146 1147 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1148 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1149 }; 1150 1151 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1152 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1153 .len = sizeof(struct ifla_vf_mac) }, 1154 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1155 .len = sizeof(struct ifla_vf_vlan) }, 1156 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1157 .len = sizeof(struct ifla_vf_tx_rate) }, 1158 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1159 .len = sizeof(struct ifla_vf_spoofchk) }, 1160 }; 1161 1162 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1163 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1164 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1165 .len = PORT_PROFILE_MAX }, 1166 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1167 .len = sizeof(struct ifla_port_vsi)}, 1168 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1169 .len = PORT_UUID_MAX }, 1170 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1171 .len = PORT_UUID_MAX }, 1172 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1173 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1174 }; 1175 1176 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1177 { 1178 struct net *net; 1179 /* Examine the link attributes and figure out which 1180 * network namespace we are talking about. 1181 */ 1182 if (tb[IFLA_NET_NS_PID]) 1183 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1184 else if (tb[IFLA_NET_NS_FD]) 1185 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1186 else 1187 net = get_net(src_net); 1188 return net; 1189 } 1190 EXPORT_SYMBOL(rtnl_link_get_net); 1191 1192 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1193 { 1194 if (dev) { 1195 if (tb[IFLA_ADDRESS] && 1196 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1197 return -EINVAL; 1198 1199 if (tb[IFLA_BROADCAST] && 1200 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1201 return -EINVAL; 1202 } 1203 1204 if (tb[IFLA_AF_SPEC]) { 1205 struct nlattr *af; 1206 int rem, err; 1207 1208 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1209 const struct rtnl_af_ops *af_ops; 1210 1211 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1212 return -EAFNOSUPPORT; 1213 1214 if (!af_ops->set_link_af) 1215 return -EOPNOTSUPP; 1216 1217 if (af_ops->validate_link_af) { 1218 err = af_ops->validate_link_af(dev, af); 1219 if (err < 0) 1220 return err; 1221 } 1222 } 1223 } 1224 1225 return 0; 1226 } 1227 1228 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1229 { 1230 int rem, err = -EINVAL; 1231 struct nlattr *vf; 1232 const struct net_device_ops *ops = dev->netdev_ops; 1233 1234 nla_for_each_nested(vf, attr, rem) { 1235 switch (nla_type(vf)) { 1236 case IFLA_VF_MAC: { 1237 struct ifla_vf_mac *ivm; 1238 ivm = nla_data(vf); 1239 err = -EOPNOTSUPP; 1240 if (ops->ndo_set_vf_mac) 1241 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1242 ivm->mac); 1243 break; 1244 } 1245 case IFLA_VF_VLAN: { 1246 struct ifla_vf_vlan *ivv; 1247 ivv = nla_data(vf); 1248 err = -EOPNOTSUPP; 1249 if (ops->ndo_set_vf_vlan) 1250 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1251 ivv->vlan, 1252 ivv->qos); 1253 break; 1254 } 1255 case IFLA_VF_TX_RATE: { 1256 struct ifla_vf_tx_rate *ivt; 1257 ivt = nla_data(vf); 1258 err = -EOPNOTSUPP; 1259 if (ops->ndo_set_vf_tx_rate) 1260 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1261 ivt->rate); 1262 break; 1263 } 1264 case IFLA_VF_SPOOFCHK: { 1265 struct ifla_vf_spoofchk *ivs; 1266 ivs = nla_data(vf); 1267 err = -EOPNOTSUPP; 1268 if (ops->ndo_set_vf_spoofchk) 1269 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1270 ivs->setting); 1271 break; 1272 } 1273 case IFLA_VF_LINK_STATE: { 1274 struct ifla_vf_link_state *ivl; 1275 ivl = nla_data(vf); 1276 err = -EOPNOTSUPP; 1277 if (ops->ndo_set_vf_link_state) 1278 err = ops->ndo_set_vf_link_state(dev, ivl->vf, 1279 ivl->link_state); 1280 break; 1281 } 1282 default: 1283 err = -EINVAL; 1284 break; 1285 } 1286 if (err) 1287 break; 1288 } 1289 return err; 1290 } 1291 1292 static int do_set_master(struct net_device *dev, int ifindex) 1293 { 1294 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1295 const struct net_device_ops *ops; 1296 int err; 1297 1298 if (upper_dev) { 1299 if (upper_dev->ifindex == ifindex) 1300 return 0; 1301 ops = upper_dev->netdev_ops; 1302 if (ops->ndo_del_slave) { 1303 err = ops->ndo_del_slave(upper_dev, dev); 1304 if (err) 1305 return err; 1306 } else { 1307 return -EOPNOTSUPP; 1308 } 1309 } 1310 1311 if (ifindex) { 1312 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1313 if (!upper_dev) 1314 return -EINVAL; 1315 ops = upper_dev->netdev_ops; 1316 if (ops->ndo_add_slave) { 1317 err = ops->ndo_add_slave(upper_dev, dev); 1318 if (err) 1319 return err; 1320 } else { 1321 return -EOPNOTSUPP; 1322 } 1323 } 1324 return 0; 1325 } 1326 1327 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1328 struct nlattr **tb, char *ifname, int modified) 1329 { 1330 const struct net_device_ops *ops = dev->netdev_ops; 1331 int err; 1332 1333 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1334 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1335 if (IS_ERR(net)) { 1336 err = PTR_ERR(net); 1337 goto errout; 1338 } 1339 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) { 1340 err = -EPERM; 1341 goto errout; 1342 } 1343 err = dev_change_net_namespace(dev, net, ifname); 1344 put_net(net); 1345 if (err) 1346 goto errout; 1347 modified = 1; 1348 } 1349 1350 if (tb[IFLA_MAP]) { 1351 struct rtnl_link_ifmap *u_map; 1352 struct ifmap k_map; 1353 1354 if (!ops->ndo_set_config) { 1355 err = -EOPNOTSUPP; 1356 goto errout; 1357 } 1358 1359 if (!netif_device_present(dev)) { 1360 err = -ENODEV; 1361 goto errout; 1362 } 1363 1364 u_map = nla_data(tb[IFLA_MAP]); 1365 k_map.mem_start = (unsigned long) u_map->mem_start; 1366 k_map.mem_end = (unsigned long) u_map->mem_end; 1367 k_map.base_addr = (unsigned short) u_map->base_addr; 1368 k_map.irq = (unsigned char) u_map->irq; 1369 k_map.dma = (unsigned char) u_map->dma; 1370 k_map.port = (unsigned char) u_map->port; 1371 1372 err = ops->ndo_set_config(dev, &k_map); 1373 if (err < 0) 1374 goto errout; 1375 1376 modified = 1; 1377 } 1378 1379 if (tb[IFLA_ADDRESS]) { 1380 struct sockaddr *sa; 1381 int len; 1382 1383 len = sizeof(sa_family_t) + dev->addr_len; 1384 sa = kmalloc(len, GFP_KERNEL); 1385 if (!sa) { 1386 err = -ENOMEM; 1387 goto errout; 1388 } 1389 sa->sa_family = dev->type; 1390 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1391 dev->addr_len); 1392 err = dev_set_mac_address(dev, sa); 1393 kfree(sa); 1394 if (err) 1395 goto errout; 1396 modified = 1; 1397 } 1398 1399 if (tb[IFLA_MTU]) { 1400 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1401 if (err < 0) 1402 goto errout; 1403 modified = 1; 1404 } 1405 1406 if (tb[IFLA_GROUP]) { 1407 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1408 modified = 1; 1409 } 1410 1411 /* 1412 * Interface selected by interface index but interface 1413 * name provided implies that a name change has been 1414 * requested. 1415 */ 1416 if (ifm->ifi_index > 0 && ifname[0]) { 1417 err = dev_change_name(dev, ifname); 1418 if (err < 0) 1419 goto errout; 1420 modified = 1; 1421 } 1422 1423 if (tb[IFLA_IFALIAS]) { 1424 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1425 nla_len(tb[IFLA_IFALIAS])); 1426 if (err < 0) 1427 goto errout; 1428 modified = 1; 1429 } 1430 1431 if (tb[IFLA_BROADCAST]) { 1432 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1433 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1434 } 1435 1436 if (ifm->ifi_flags || ifm->ifi_change) { 1437 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1438 if (err < 0) 1439 goto errout; 1440 } 1441 1442 if (tb[IFLA_MASTER]) { 1443 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1444 if (err) 1445 goto errout; 1446 modified = 1; 1447 } 1448 1449 if (tb[IFLA_CARRIER]) { 1450 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1451 if (err) 1452 goto errout; 1453 modified = 1; 1454 } 1455 1456 if (tb[IFLA_TXQLEN]) 1457 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1458 1459 if (tb[IFLA_OPERSTATE]) 1460 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1461 1462 if (tb[IFLA_LINKMODE]) { 1463 write_lock_bh(&dev_base_lock); 1464 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1465 write_unlock_bh(&dev_base_lock); 1466 } 1467 1468 if (tb[IFLA_VFINFO_LIST]) { 1469 struct nlattr *attr; 1470 int rem; 1471 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1472 if (nla_type(attr) != IFLA_VF_INFO) { 1473 err = -EINVAL; 1474 goto errout; 1475 } 1476 err = do_setvfinfo(dev, attr); 1477 if (err < 0) 1478 goto errout; 1479 modified = 1; 1480 } 1481 } 1482 err = 0; 1483 1484 if (tb[IFLA_VF_PORTS]) { 1485 struct nlattr *port[IFLA_PORT_MAX+1]; 1486 struct nlattr *attr; 1487 int vf; 1488 int rem; 1489 1490 err = -EOPNOTSUPP; 1491 if (!ops->ndo_set_vf_port) 1492 goto errout; 1493 1494 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1495 if (nla_type(attr) != IFLA_VF_PORT) 1496 continue; 1497 err = nla_parse_nested(port, IFLA_PORT_MAX, 1498 attr, ifla_port_policy); 1499 if (err < 0) 1500 goto errout; 1501 if (!port[IFLA_PORT_VF]) { 1502 err = -EOPNOTSUPP; 1503 goto errout; 1504 } 1505 vf = nla_get_u32(port[IFLA_PORT_VF]); 1506 err = ops->ndo_set_vf_port(dev, vf, port); 1507 if (err < 0) 1508 goto errout; 1509 modified = 1; 1510 } 1511 } 1512 err = 0; 1513 1514 if (tb[IFLA_PORT_SELF]) { 1515 struct nlattr *port[IFLA_PORT_MAX+1]; 1516 1517 err = nla_parse_nested(port, IFLA_PORT_MAX, 1518 tb[IFLA_PORT_SELF], ifla_port_policy); 1519 if (err < 0) 1520 goto errout; 1521 1522 err = -EOPNOTSUPP; 1523 if (ops->ndo_set_vf_port) 1524 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1525 if (err < 0) 1526 goto errout; 1527 modified = 1; 1528 } 1529 1530 if (tb[IFLA_AF_SPEC]) { 1531 struct nlattr *af; 1532 int rem; 1533 1534 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1535 const struct rtnl_af_ops *af_ops; 1536 1537 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1538 BUG(); 1539 1540 err = af_ops->set_link_af(dev, af); 1541 if (err < 0) 1542 goto errout; 1543 1544 modified = 1; 1545 } 1546 } 1547 err = 0; 1548 1549 errout: 1550 if (err < 0 && modified) 1551 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", 1552 dev->name); 1553 1554 return err; 1555 } 1556 1557 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1558 { 1559 struct net *net = sock_net(skb->sk); 1560 struct ifinfomsg *ifm; 1561 struct net_device *dev; 1562 int err; 1563 struct nlattr *tb[IFLA_MAX+1]; 1564 char ifname[IFNAMSIZ]; 1565 1566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1567 if (err < 0) 1568 goto errout; 1569 1570 if (tb[IFLA_IFNAME]) 1571 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1572 else 1573 ifname[0] = '\0'; 1574 1575 err = -EINVAL; 1576 ifm = nlmsg_data(nlh); 1577 if (ifm->ifi_index > 0) 1578 dev = __dev_get_by_index(net, ifm->ifi_index); 1579 else if (tb[IFLA_IFNAME]) 1580 dev = __dev_get_by_name(net, ifname); 1581 else 1582 goto errout; 1583 1584 if (dev == NULL) { 1585 err = -ENODEV; 1586 goto errout; 1587 } 1588 1589 err = validate_linkmsg(dev, tb); 1590 if (err < 0) 1591 goto errout; 1592 1593 err = do_setlink(dev, ifm, tb, ifname, 0); 1594 errout: 1595 return err; 1596 } 1597 1598 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1599 { 1600 struct net *net = sock_net(skb->sk); 1601 const struct rtnl_link_ops *ops; 1602 struct net_device *dev; 1603 struct ifinfomsg *ifm; 1604 char ifname[IFNAMSIZ]; 1605 struct nlattr *tb[IFLA_MAX+1]; 1606 int err; 1607 LIST_HEAD(list_kill); 1608 1609 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1610 if (err < 0) 1611 return err; 1612 1613 if (tb[IFLA_IFNAME]) 1614 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1615 1616 ifm = nlmsg_data(nlh); 1617 if (ifm->ifi_index > 0) 1618 dev = __dev_get_by_index(net, ifm->ifi_index); 1619 else if (tb[IFLA_IFNAME]) 1620 dev = __dev_get_by_name(net, ifname); 1621 else 1622 return -EINVAL; 1623 1624 if (!dev) 1625 return -ENODEV; 1626 1627 ops = dev->rtnl_link_ops; 1628 if (!ops) 1629 return -EOPNOTSUPP; 1630 1631 ops->dellink(dev, &list_kill); 1632 unregister_netdevice_many(&list_kill); 1633 list_del(&list_kill); 1634 return 0; 1635 } 1636 1637 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1638 { 1639 unsigned int old_flags; 1640 int err; 1641 1642 old_flags = dev->flags; 1643 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1644 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1645 if (err < 0) 1646 return err; 1647 } 1648 1649 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1650 1651 __dev_notify_flags(dev, old_flags, ~0U); 1652 return 0; 1653 } 1654 EXPORT_SYMBOL(rtnl_configure_link); 1655 1656 struct net_device *rtnl_create_link(struct net *net, 1657 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1658 { 1659 int err; 1660 struct net_device *dev; 1661 unsigned int num_tx_queues = 1; 1662 unsigned int num_rx_queues = 1; 1663 1664 if (tb[IFLA_NUM_TX_QUEUES]) 1665 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1666 else if (ops->get_num_tx_queues) 1667 num_tx_queues = ops->get_num_tx_queues(); 1668 1669 if (tb[IFLA_NUM_RX_QUEUES]) 1670 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1671 else if (ops->get_num_rx_queues) 1672 num_rx_queues = ops->get_num_rx_queues(); 1673 1674 err = -ENOMEM; 1675 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup, 1676 num_tx_queues, num_rx_queues); 1677 if (!dev) 1678 goto err; 1679 1680 dev_net_set(dev, net); 1681 dev->rtnl_link_ops = ops; 1682 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1683 1684 if (tb[IFLA_MTU]) 1685 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1686 if (tb[IFLA_ADDRESS]) { 1687 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1688 nla_len(tb[IFLA_ADDRESS])); 1689 dev->addr_assign_type = NET_ADDR_SET; 1690 } 1691 if (tb[IFLA_BROADCAST]) 1692 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1693 nla_len(tb[IFLA_BROADCAST])); 1694 if (tb[IFLA_TXQLEN]) 1695 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1696 if (tb[IFLA_OPERSTATE]) 1697 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1698 if (tb[IFLA_LINKMODE]) 1699 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1700 if (tb[IFLA_GROUP]) 1701 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1702 1703 return dev; 1704 1705 err: 1706 return ERR_PTR(err); 1707 } 1708 EXPORT_SYMBOL(rtnl_create_link); 1709 1710 static int rtnl_group_changelink(struct net *net, int group, 1711 struct ifinfomsg *ifm, 1712 struct nlattr **tb) 1713 { 1714 struct net_device *dev; 1715 int err; 1716 1717 for_each_netdev(net, dev) { 1718 if (dev->group == group) { 1719 err = do_setlink(dev, ifm, tb, NULL, 0); 1720 if (err < 0) 1721 return err; 1722 } 1723 } 1724 1725 return 0; 1726 } 1727 1728 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1729 { 1730 struct net *net = sock_net(skb->sk); 1731 const struct rtnl_link_ops *ops; 1732 struct net_device *dev; 1733 struct ifinfomsg *ifm; 1734 char kind[MODULE_NAME_LEN]; 1735 char ifname[IFNAMSIZ]; 1736 struct nlattr *tb[IFLA_MAX+1]; 1737 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1738 int err; 1739 1740 #ifdef CONFIG_MODULES 1741 replay: 1742 #endif 1743 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1744 if (err < 0) 1745 return err; 1746 1747 if (tb[IFLA_IFNAME]) 1748 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1749 else 1750 ifname[0] = '\0'; 1751 1752 ifm = nlmsg_data(nlh); 1753 if (ifm->ifi_index > 0) 1754 dev = __dev_get_by_index(net, ifm->ifi_index); 1755 else { 1756 if (ifname[0]) 1757 dev = __dev_get_by_name(net, ifname); 1758 else 1759 dev = NULL; 1760 } 1761 1762 err = validate_linkmsg(dev, tb); 1763 if (err < 0) 1764 return err; 1765 1766 if (tb[IFLA_LINKINFO]) { 1767 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1768 tb[IFLA_LINKINFO], ifla_info_policy); 1769 if (err < 0) 1770 return err; 1771 } else 1772 memset(linkinfo, 0, sizeof(linkinfo)); 1773 1774 if (linkinfo[IFLA_INFO_KIND]) { 1775 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1776 ops = rtnl_link_ops_get(kind); 1777 } else { 1778 kind[0] = '\0'; 1779 ops = NULL; 1780 } 1781 1782 if (1) { 1783 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1784 struct net *dest_net; 1785 1786 if (ops) { 1787 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1788 err = nla_parse_nested(attr, ops->maxtype, 1789 linkinfo[IFLA_INFO_DATA], 1790 ops->policy); 1791 if (err < 0) 1792 return err; 1793 data = attr; 1794 } 1795 if (ops->validate) { 1796 err = ops->validate(tb, data); 1797 if (err < 0) 1798 return err; 1799 } 1800 } 1801 1802 if (dev) { 1803 int modified = 0; 1804 1805 if (nlh->nlmsg_flags & NLM_F_EXCL) 1806 return -EEXIST; 1807 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1808 return -EOPNOTSUPP; 1809 1810 if (linkinfo[IFLA_INFO_DATA]) { 1811 if (!ops || ops != dev->rtnl_link_ops || 1812 !ops->changelink) 1813 return -EOPNOTSUPP; 1814 1815 err = ops->changelink(dev, tb, data); 1816 if (err < 0) 1817 return err; 1818 modified = 1; 1819 } 1820 1821 return do_setlink(dev, ifm, tb, ifname, modified); 1822 } 1823 1824 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1825 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1826 return rtnl_group_changelink(net, 1827 nla_get_u32(tb[IFLA_GROUP]), 1828 ifm, tb); 1829 return -ENODEV; 1830 } 1831 1832 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1833 return -EOPNOTSUPP; 1834 1835 if (!ops) { 1836 #ifdef CONFIG_MODULES 1837 if (kind[0]) { 1838 __rtnl_unlock(); 1839 request_module("rtnl-link-%s", kind); 1840 rtnl_lock(); 1841 ops = rtnl_link_ops_get(kind); 1842 if (ops) 1843 goto replay; 1844 } 1845 #endif 1846 return -EOPNOTSUPP; 1847 } 1848 1849 if (!ifname[0]) 1850 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1851 1852 dest_net = rtnl_link_get_net(net, tb); 1853 if (IS_ERR(dest_net)) 1854 return PTR_ERR(dest_net); 1855 1856 dev = rtnl_create_link(dest_net, ifname, ops, tb); 1857 if (IS_ERR(dev)) { 1858 err = PTR_ERR(dev); 1859 goto out; 1860 } 1861 1862 dev->ifindex = ifm->ifi_index; 1863 1864 if (ops->newlink) 1865 err = ops->newlink(net, dev, tb, data); 1866 else 1867 err = register_netdevice(dev); 1868 1869 if (err < 0) { 1870 free_netdev(dev); 1871 goto out; 1872 } 1873 1874 err = rtnl_configure_link(dev, ifm); 1875 if (err < 0) 1876 unregister_netdevice(dev); 1877 out: 1878 put_net(dest_net); 1879 return err; 1880 } 1881 } 1882 1883 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 1884 { 1885 struct net *net = sock_net(skb->sk); 1886 struct ifinfomsg *ifm; 1887 char ifname[IFNAMSIZ]; 1888 struct nlattr *tb[IFLA_MAX+1]; 1889 struct net_device *dev = NULL; 1890 struct sk_buff *nskb; 1891 int err; 1892 u32 ext_filter_mask = 0; 1893 1894 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1895 if (err < 0) 1896 return err; 1897 1898 if (tb[IFLA_IFNAME]) 1899 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1900 1901 if (tb[IFLA_EXT_MASK]) 1902 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1903 1904 ifm = nlmsg_data(nlh); 1905 if (ifm->ifi_index > 0) 1906 dev = __dev_get_by_index(net, ifm->ifi_index); 1907 else if (tb[IFLA_IFNAME]) 1908 dev = __dev_get_by_name(net, ifname); 1909 else 1910 return -EINVAL; 1911 1912 if (dev == NULL) 1913 return -ENODEV; 1914 1915 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1916 if (nskb == NULL) 1917 return -ENOBUFS; 1918 1919 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 1920 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1921 if (err < 0) { 1922 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1923 WARN_ON(err == -EMSGSIZE); 1924 kfree_skb(nskb); 1925 } else 1926 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 1927 1928 return err; 1929 } 1930 1931 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1932 { 1933 struct net *net = sock_net(skb->sk); 1934 struct net_device *dev; 1935 struct nlattr *tb[IFLA_MAX+1]; 1936 u32 ext_filter_mask = 0; 1937 u16 min_ifinfo_dump_size = 0; 1938 1939 if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 1940 ifla_policy) >= 0) { 1941 if (tb[IFLA_EXT_MASK]) 1942 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1943 } 1944 1945 if (!ext_filter_mask) 1946 return NLMSG_GOODSIZE; 1947 /* 1948 * traverse the list of net devices and compute the minimum 1949 * buffer size based upon the filter mask. 1950 */ 1951 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1952 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1953 if_nlmsg_size(dev, 1954 ext_filter_mask)); 1955 } 1956 1957 return min_ifinfo_dump_size; 1958 } 1959 1960 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1961 { 1962 int idx; 1963 int s_idx = cb->family; 1964 1965 if (s_idx == 0) 1966 s_idx = 1; 1967 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1968 int type = cb->nlh->nlmsg_type-RTM_BASE; 1969 if (idx < s_idx || idx == PF_PACKET) 1970 continue; 1971 if (rtnl_msg_handlers[idx] == NULL || 1972 rtnl_msg_handlers[idx][type].dumpit == NULL) 1973 continue; 1974 if (idx > s_idx) { 1975 memset(&cb->args[0], 0, sizeof(cb->args)); 1976 cb->prev_seq = 0; 1977 cb->seq = 0; 1978 } 1979 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1980 break; 1981 } 1982 cb->family = idx; 1983 1984 return skb->len; 1985 } 1986 1987 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, 1988 gfp_t flags) 1989 { 1990 struct net *net = dev_net(dev); 1991 struct sk_buff *skb; 1992 int err = -ENOBUFS; 1993 size_t if_info_size; 1994 1995 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags); 1996 if (skb == NULL) 1997 goto errout; 1998 1999 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 2000 if (err < 0) { 2001 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 2002 WARN_ON(err == -EMSGSIZE); 2003 kfree_skb(skb); 2004 goto errout; 2005 } 2006 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags); 2007 return; 2008 errout: 2009 if (err < 0) 2010 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2011 } 2012 EXPORT_SYMBOL(rtmsg_ifinfo); 2013 2014 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 2015 struct net_device *dev, 2016 u8 *addr, u32 pid, u32 seq, 2017 int type, unsigned int flags) 2018 { 2019 struct nlmsghdr *nlh; 2020 struct ndmsg *ndm; 2021 2022 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI); 2023 if (!nlh) 2024 return -EMSGSIZE; 2025 2026 ndm = nlmsg_data(nlh); 2027 ndm->ndm_family = AF_BRIDGE; 2028 ndm->ndm_pad1 = 0; 2029 ndm->ndm_pad2 = 0; 2030 ndm->ndm_flags = flags; 2031 ndm->ndm_type = 0; 2032 ndm->ndm_ifindex = dev->ifindex; 2033 ndm->ndm_state = NUD_PERMANENT; 2034 2035 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2036 goto nla_put_failure; 2037 2038 return nlmsg_end(skb, nlh); 2039 2040 nla_put_failure: 2041 nlmsg_cancel(skb, nlh); 2042 return -EMSGSIZE; 2043 } 2044 2045 static inline size_t rtnl_fdb_nlmsg_size(void) 2046 { 2047 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2048 } 2049 2050 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2051 { 2052 struct net *net = dev_net(dev); 2053 struct sk_buff *skb; 2054 int err = -ENOBUFS; 2055 2056 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2057 if (!skb) 2058 goto errout; 2059 2060 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF); 2061 if (err < 0) { 2062 kfree_skb(skb); 2063 goto errout; 2064 } 2065 2066 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2067 return; 2068 errout: 2069 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2070 } 2071 2072 /** 2073 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2074 */ 2075 int ndo_dflt_fdb_add(struct ndmsg *ndm, 2076 struct nlattr *tb[], 2077 struct net_device *dev, 2078 const unsigned char *addr, 2079 u16 flags) 2080 { 2081 int err = -EINVAL; 2082 2083 /* If aging addresses are supported device will need to 2084 * implement its own handler for this. 2085 */ 2086 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2087 pr_info("%s: FDB only supports static addresses\n", dev->name); 2088 return err; 2089 } 2090 2091 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2092 err = dev_uc_add_excl(dev, addr); 2093 else if (is_multicast_ether_addr(addr)) 2094 err = dev_mc_add_excl(dev, addr); 2095 2096 /* Only return duplicate errors if NLM_F_EXCL is set */ 2097 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2098 err = 0; 2099 2100 return err; 2101 } 2102 EXPORT_SYMBOL(ndo_dflt_fdb_add); 2103 2104 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2105 { 2106 struct net *net = sock_net(skb->sk); 2107 struct ndmsg *ndm; 2108 struct nlattr *tb[NDA_MAX+1]; 2109 struct net_device *dev; 2110 u8 *addr; 2111 int err; 2112 2113 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2114 if (err < 0) 2115 return err; 2116 2117 ndm = nlmsg_data(nlh); 2118 if (ndm->ndm_ifindex == 0) { 2119 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2120 return -EINVAL; 2121 } 2122 2123 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2124 if (dev == NULL) { 2125 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2126 return -ENODEV; 2127 } 2128 2129 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2130 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2131 return -EINVAL; 2132 } 2133 2134 addr = nla_data(tb[NDA_LLADDR]); 2135 2136 err = -EOPNOTSUPP; 2137 2138 /* Support fdb on master device the net/bridge default case */ 2139 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2140 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2141 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2142 const struct net_device_ops *ops = br_dev->netdev_ops; 2143 2144 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags); 2145 if (err) 2146 goto out; 2147 else 2148 ndm->ndm_flags &= ~NTF_MASTER; 2149 } 2150 2151 /* Embedded bridge, macvlan, and any other device support */ 2152 if ((ndm->ndm_flags & NTF_SELF)) { 2153 if (dev->netdev_ops->ndo_fdb_add) 2154 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2155 nlh->nlmsg_flags); 2156 else 2157 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, 2158 nlh->nlmsg_flags); 2159 2160 if (!err) { 2161 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2162 ndm->ndm_flags &= ~NTF_SELF; 2163 } 2164 } 2165 out: 2166 return err; 2167 } 2168 2169 /** 2170 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2171 */ 2172 int ndo_dflt_fdb_del(struct ndmsg *ndm, 2173 struct nlattr *tb[], 2174 struct net_device *dev, 2175 const unsigned char *addr) 2176 { 2177 int err = -EOPNOTSUPP; 2178 2179 /* If aging addresses are supported device will need to 2180 * implement its own handler for this. 2181 */ 2182 if (!(ndm->ndm_state & NUD_PERMANENT)) { 2183 pr_info("%s: FDB only supports static addresses\n", dev->name); 2184 return -EINVAL; 2185 } 2186 2187 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2188 err = dev_uc_del(dev, addr); 2189 else if (is_multicast_ether_addr(addr)) 2190 err = dev_mc_del(dev, addr); 2191 else 2192 err = -EINVAL; 2193 2194 return err; 2195 } 2196 EXPORT_SYMBOL(ndo_dflt_fdb_del); 2197 2198 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2199 { 2200 struct net *net = sock_net(skb->sk); 2201 struct ndmsg *ndm; 2202 struct nlattr *tb[NDA_MAX+1]; 2203 struct net_device *dev; 2204 int err = -EINVAL; 2205 __u8 *addr; 2206 2207 if (!capable(CAP_NET_ADMIN)) 2208 return -EPERM; 2209 2210 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2211 if (err < 0) 2212 return err; 2213 2214 ndm = nlmsg_data(nlh); 2215 if (ndm->ndm_ifindex == 0) { 2216 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2217 return -EINVAL; 2218 } 2219 2220 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2221 if (dev == NULL) { 2222 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2223 return -ENODEV; 2224 } 2225 2226 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2227 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2228 return -EINVAL; 2229 } 2230 2231 addr = nla_data(tb[NDA_LLADDR]); 2232 2233 err = -EOPNOTSUPP; 2234 2235 /* Support fdb on master device the net/bridge default case */ 2236 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2237 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2238 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2239 const struct net_device_ops *ops = br_dev->netdev_ops; 2240 2241 if (ops->ndo_fdb_del) 2242 err = ops->ndo_fdb_del(ndm, tb, dev, addr); 2243 2244 if (err) 2245 goto out; 2246 else 2247 ndm->ndm_flags &= ~NTF_MASTER; 2248 } 2249 2250 /* Embedded bridge, macvlan, and any other device support */ 2251 if (ndm->ndm_flags & NTF_SELF) { 2252 if (dev->netdev_ops->ndo_fdb_del) 2253 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr); 2254 else 2255 err = ndo_dflt_fdb_del(ndm, tb, dev, addr); 2256 2257 if (!err) { 2258 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2259 ndm->ndm_flags &= ~NTF_SELF; 2260 } 2261 } 2262 out: 2263 return err; 2264 } 2265 2266 static int nlmsg_populate_fdb(struct sk_buff *skb, 2267 struct netlink_callback *cb, 2268 struct net_device *dev, 2269 int *idx, 2270 struct netdev_hw_addr_list *list) 2271 { 2272 struct netdev_hw_addr *ha; 2273 int err; 2274 u32 portid, seq; 2275 2276 portid = NETLINK_CB(cb->skb).portid; 2277 seq = cb->nlh->nlmsg_seq; 2278 2279 list_for_each_entry(ha, &list->list, list) { 2280 if (*idx < cb->args[0]) 2281 goto skip; 2282 2283 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2284 portid, seq, 2285 RTM_NEWNEIGH, NTF_SELF); 2286 if (err < 0) 2287 return err; 2288 skip: 2289 *idx += 1; 2290 } 2291 return 0; 2292 } 2293 2294 /** 2295 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2296 * @nlh: netlink message header 2297 * @dev: netdevice 2298 * 2299 * Default netdevice operation to dump the existing unicast address list. 2300 * Returns number of addresses from list put in skb. 2301 */ 2302 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2303 struct netlink_callback *cb, 2304 struct net_device *dev, 2305 int idx) 2306 { 2307 int err; 2308 2309 netif_addr_lock_bh(dev); 2310 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2311 if (err) 2312 goto out; 2313 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2314 out: 2315 netif_addr_unlock_bh(dev); 2316 return idx; 2317 } 2318 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2319 2320 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2321 { 2322 int idx = 0; 2323 struct net *net = sock_net(skb->sk); 2324 struct net_device *dev; 2325 2326 rcu_read_lock(); 2327 for_each_netdev_rcu(net, dev) { 2328 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2329 struct net_device *br_dev; 2330 const struct net_device_ops *ops; 2331 2332 br_dev = netdev_master_upper_dev_get(dev); 2333 ops = br_dev->netdev_ops; 2334 if (ops->ndo_fdb_dump) 2335 idx = ops->ndo_fdb_dump(skb, cb, dev, idx); 2336 } 2337 2338 if (dev->netdev_ops->ndo_fdb_dump) 2339 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx); 2340 else 2341 idx = ndo_dflt_fdb_dump(skb, cb, dev, idx); 2342 } 2343 rcu_read_unlock(); 2344 2345 cb->args[0] = idx; 2346 return skb->len; 2347 } 2348 2349 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2350 struct net_device *dev, u16 mode) 2351 { 2352 struct nlmsghdr *nlh; 2353 struct ifinfomsg *ifm; 2354 struct nlattr *br_afspec; 2355 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2356 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2357 2358 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); 2359 if (nlh == NULL) 2360 return -EMSGSIZE; 2361 2362 ifm = nlmsg_data(nlh); 2363 ifm->ifi_family = AF_BRIDGE; 2364 ifm->__ifi_pad = 0; 2365 ifm->ifi_type = dev->type; 2366 ifm->ifi_index = dev->ifindex; 2367 ifm->ifi_flags = dev_get_flags(dev); 2368 ifm->ifi_change = 0; 2369 2370 2371 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2372 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2373 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2374 (br_dev && 2375 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2376 (dev->addr_len && 2377 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2378 (dev->ifindex != dev->iflink && 2379 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 2380 goto nla_put_failure; 2381 2382 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2383 if (!br_afspec) 2384 goto nla_put_failure; 2385 2386 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) || 2387 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2388 nla_nest_cancel(skb, br_afspec); 2389 goto nla_put_failure; 2390 } 2391 nla_nest_end(skb, br_afspec); 2392 2393 return nlmsg_end(skb, nlh); 2394 nla_put_failure: 2395 nlmsg_cancel(skb, nlh); 2396 return -EMSGSIZE; 2397 } 2398 EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2399 2400 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2401 { 2402 struct net *net = sock_net(skb->sk); 2403 struct net_device *dev; 2404 int idx = 0; 2405 u32 portid = NETLINK_CB(cb->skb).portid; 2406 u32 seq = cb->nlh->nlmsg_seq; 2407 struct nlattr *extfilt; 2408 u32 filter_mask = 0; 2409 2410 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), 2411 IFLA_EXT_MASK); 2412 if (extfilt) 2413 filter_mask = nla_get_u32(extfilt); 2414 2415 rcu_read_lock(); 2416 for_each_netdev_rcu(net, dev) { 2417 const struct net_device_ops *ops = dev->netdev_ops; 2418 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2419 2420 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2421 if (idx >= cb->args[0] && 2422 br_dev->netdev_ops->ndo_bridge_getlink( 2423 skb, portid, seq, dev, filter_mask) < 0) 2424 break; 2425 idx++; 2426 } 2427 2428 if (ops->ndo_bridge_getlink) { 2429 if (idx >= cb->args[0] && 2430 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2431 filter_mask) < 0) 2432 break; 2433 idx++; 2434 } 2435 } 2436 rcu_read_unlock(); 2437 cb->args[0] = idx; 2438 2439 return skb->len; 2440 } 2441 2442 static inline size_t bridge_nlmsg_size(void) 2443 { 2444 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2445 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 2446 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 2447 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 2448 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 2449 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 2450 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 2451 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 2452 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 2453 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 2454 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 2455 } 2456 2457 static int rtnl_bridge_notify(struct net_device *dev, u16 flags) 2458 { 2459 struct net *net = dev_net(dev); 2460 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2461 struct sk_buff *skb; 2462 int err = -EOPNOTSUPP; 2463 2464 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 2465 if (!skb) { 2466 err = -ENOMEM; 2467 goto errout; 2468 } 2469 2470 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) && 2471 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2472 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2473 if (err < 0) 2474 goto errout; 2475 } 2476 2477 if ((flags & BRIDGE_FLAGS_SELF) && 2478 dev->netdev_ops->ndo_bridge_getlink) { 2479 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2480 if (err < 0) 2481 goto errout; 2482 } 2483 2484 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 2485 return 0; 2486 errout: 2487 WARN_ON(err == -EMSGSIZE); 2488 kfree_skb(skb); 2489 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2490 return err; 2491 } 2492 2493 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2494 { 2495 struct net *net = sock_net(skb->sk); 2496 struct ifinfomsg *ifm; 2497 struct net_device *dev; 2498 struct nlattr *br_spec, *attr = NULL; 2499 int rem, err = -EOPNOTSUPP; 2500 u16 oflags, flags = 0; 2501 bool have_flags = false; 2502 2503 if (nlmsg_len(nlh) < sizeof(*ifm)) 2504 return -EINVAL; 2505 2506 ifm = nlmsg_data(nlh); 2507 if (ifm->ifi_family != AF_BRIDGE) 2508 return -EPFNOSUPPORT; 2509 2510 dev = __dev_get_by_index(net, ifm->ifi_index); 2511 if (!dev) { 2512 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2513 return -ENODEV; 2514 } 2515 2516 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2517 if (br_spec) { 2518 nla_for_each_nested(attr, br_spec, rem) { 2519 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2520 have_flags = true; 2521 flags = nla_get_u16(attr); 2522 break; 2523 } 2524 } 2525 } 2526 2527 oflags = flags; 2528 2529 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2530 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2531 2532 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 2533 err = -EOPNOTSUPP; 2534 goto out; 2535 } 2536 2537 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2538 if (err) 2539 goto out; 2540 2541 flags &= ~BRIDGE_FLAGS_MASTER; 2542 } 2543 2544 if ((flags & BRIDGE_FLAGS_SELF)) { 2545 if (!dev->netdev_ops->ndo_bridge_setlink) 2546 err = -EOPNOTSUPP; 2547 else 2548 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2549 2550 if (!err) 2551 flags &= ~BRIDGE_FLAGS_SELF; 2552 } 2553 2554 if (have_flags) 2555 memcpy(nla_data(attr), &flags, sizeof(flags)); 2556 /* Generate event to notify upper layer of bridge change */ 2557 if (!err) 2558 err = rtnl_bridge_notify(dev, oflags); 2559 out: 2560 return err; 2561 } 2562 2563 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2564 { 2565 struct net *net = sock_net(skb->sk); 2566 struct ifinfomsg *ifm; 2567 struct net_device *dev; 2568 struct nlattr *br_spec, *attr = NULL; 2569 int rem, err = -EOPNOTSUPP; 2570 u16 oflags, flags = 0; 2571 bool have_flags = false; 2572 2573 if (nlmsg_len(nlh) < sizeof(*ifm)) 2574 return -EINVAL; 2575 2576 ifm = nlmsg_data(nlh); 2577 if (ifm->ifi_family != AF_BRIDGE) 2578 return -EPFNOSUPPORT; 2579 2580 dev = __dev_get_by_index(net, ifm->ifi_index); 2581 if (!dev) { 2582 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2583 return -ENODEV; 2584 } 2585 2586 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2587 if (br_spec) { 2588 nla_for_each_nested(attr, br_spec, rem) { 2589 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2590 have_flags = true; 2591 flags = nla_get_u16(attr); 2592 break; 2593 } 2594 } 2595 } 2596 2597 oflags = flags; 2598 2599 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2600 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2601 2602 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 2603 err = -EOPNOTSUPP; 2604 goto out; 2605 } 2606 2607 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2608 if (err) 2609 goto out; 2610 2611 flags &= ~BRIDGE_FLAGS_MASTER; 2612 } 2613 2614 if ((flags & BRIDGE_FLAGS_SELF)) { 2615 if (!dev->netdev_ops->ndo_bridge_dellink) 2616 err = -EOPNOTSUPP; 2617 else 2618 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2619 2620 if (!err) 2621 flags &= ~BRIDGE_FLAGS_SELF; 2622 } 2623 2624 if (have_flags) 2625 memcpy(nla_data(attr), &flags, sizeof(flags)); 2626 /* Generate event to notify upper layer of bridge change */ 2627 if (!err) 2628 err = rtnl_bridge_notify(dev, oflags); 2629 out: 2630 return err; 2631 } 2632 2633 /* Process one rtnetlink message. */ 2634 2635 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2636 { 2637 struct net *net = sock_net(skb->sk); 2638 rtnl_doit_func doit; 2639 int sz_idx, kind; 2640 int family; 2641 int type; 2642 int err; 2643 2644 type = nlh->nlmsg_type; 2645 if (type > RTM_MAX) 2646 return -EOPNOTSUPP; 2647 2648 type -= RTM_BASE; 2649 2650 /* All the messages must have at least 1 byte length */ 2651 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 2652 return 0; 2653 2654 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 2655 sz_idx = type>>2; 2656 kind = type&3; 2657 2658 if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN)) 2659 return -EPERM; 2660 2661 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2662 struct sock *rtnl; 2663 rtnl_dumpit_func dumpit; 2664 rtnl_calcit_func calcit; 2665 u16 min_dump_alloc = 0; 2666 2667 dumpit = rtnl_get_dumpit(family, type); 2668 if (dumpit == NULL) 2669 return -EOPNOTSUPP; 2670 calcit = rtnl_get_calcit(family, type); 2671 if (calcit) 2672 min_dump_alloc = calcit(skb, nlh); 2673 2674 __rtnl_unlock(); 2675 rtnl = net->rtnl; 2676 { 2677 struct netlink_dump_control c = { 2678 .dump = dumpit, 2679 .min_dump_alloc = min_dump_alloc, 2680 }; 2681 err = netlink_dump_start(rtnl, skb, nlh, &c); 2682 } 2683 rtnl_lock(); 2684 return err; 2685 } 2686 2687 doit = rtnl_get_doit(family, type); 2688 if (doit == NULL) 2689 return -EOPNOTSUPP; 2690 2691 return doit(skb, nlh); 2692 } 2693 2694 static void rtnetlink_rcv(struct sk_buff *skb) 2695 { 2696 rtnl_lock(); 2697 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2698 rtnl_unlock(); 2699 } 2700 2701 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2702 { 2703 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2704 2705 switch (event) { 2706 case NETDEV_UP: 2707 case NETDEV_DOWN: 2708 case NETDEV_PRE_UP: 2709 case NETDEV_POST_INIT: 2710 case NETDEV_REGISTER: 2711 case NETDEV_CHANGE: 2712 case NETDEV_PRE_TYPE_CHANGE: 2713 case NETDEV_GOING_DOWN: 2714 case NETDEV_UNREGISTER: 2715 case NETDEV_UNREGISTER_FINAL: 2716 case NETDEV_RELEASE: 2717 case NETDEV_JOIN: 2718 break; 2719 default: 2720 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); 2721 break; 2722 } 2723 return NOTIFY_DONE; 2724 } 2725 2726 static struct notifier_block rtnetlink_dev_notifier = { 2727 .notifier_call = rtnetlink_event, 2728 }; 2729 2730 2731 static int __net_init rtnetlink_net_init(struct net *net) 2732 { 2733 struct sock *sk; 2734 struct netlink_kernel_cfg cfg = { 2735 .groups = RTNLGRP_MAX, 2736 .input = rtnetlink_rcv, 2737 .cb_mutex = &rtnl_mutex, 2738 .flags = NL_CFG_F_NONROOT_RECV, 2739 }; 2740 2741 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 2742 if (!sk) 2743 return -ENOMEM; 2744 net->rtnl = sk; 2745 return 0; 2746 } 2747 2748 static void __net_exit rtnetlink_net_exit(struct net *net) 2749 { 2750 netlink_kernel_release(net->rtnl); 2751 net->rtnl = NULL; 2752 } 2753 2754 static struct pernet_operations rtnetlink_net_ops = { 2755 .init = rtnetlink_net_init, 2756 .exit = rtnetlink_net_exit, 2757 }; 2758 2759 void __init rtnetlink_init(void) 2760 { 2761 if (register_pernet_subsys(&rtnetlink_net_ops)) 2762 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2763 2764 register_netdevice_notifier(&rtnetlink_dev_notifier); 2765 2766 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2767 rtnl_dump_ifinfo, rtnl_calcit); 2768 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2769 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2770 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2771 2772 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2773 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2774 2775 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 2776 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 2777 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 2778 2779 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 2780 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 2781 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 2782 } 2783 2784