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