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(4) /* IFLA_NUM_TX_QUEUES */ 775 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 776 + nla_total_size(1) /* IFLA_OPERSTATE */ 777 + nla_total_size(1) /* IFLA_LINKMODE */ 778 + nla_total_size(ext_filter_mask 779 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 780 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 781 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 782 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 783 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 784 } 785 786 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 787 { 788 struct nlattr *vf_ports; 789 struct nlattr *vf_port; 790 int vf; 791 int err; 792 793 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 794 if (!vf_ports) 795 return -EMSGSIZE; 796 797 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 798 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 799 if (!vf_port) 800 goto nla_put_failure; 801 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 802 goto nla_put_failure; 803 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 804 if (err == -EMSGSIZE) 805 goto nla_put_failure; 806 if (err) { 807 nla_nest_cancel(skb, vf_port); 808 continue; 809 } 810 nla_nest_end(skb, vf_port); 811 } 812 813 nla_nest_end(skb, vf_ports); 814 815 return 0; 816 817 nla_put_failure: 818 nla_nest_cancel(skb, vf_ports); 819 return -EMSGSIZE; 820 } 821 822 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 823 { 824 struct nlattr *port_self; 825 int err; 826 827 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 828 if (!port_self) 829 return -EMSGSIZE; 830 831 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 832 if (err) { 833 nla_nest_cancel(skb, port_self); 834 return (err == -EMSGSIZE) ? err : 0; 835 } 836 837 nla_nest_end(skb, port_self); 838 839 return 0; 840 } 841 842 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 843 { 844 int err; 845 846 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 847 return 0; 848 849 err = rtnl_port_self_fill(skb, dev); 850 if (err) 851 return err; 852 853 if (dev_num_vf(dev->dev.parent)) { 854 err = rtnl_vf_ports_fill(skb, dev); 855 if (err) 856 return err; 857 } 858 859 return 0; 860 } 861 862 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 863 int type, u32 pid, u32 seq, u32 change, 864 unsigned int flags, u32 ext_filter_mask) 865 { 866 struct ifinfomsg *ifm; 867 struct nlmsghdr *nlh; 868 struct rtnl_link_stats64 temp; 869 const struct rtnl_link_stats64 *stats; 870 struct nlattr *attr, *af_spec; 871 struct rtnl_af_ops *af_ops; 872 873 ASSERT_RTNL(); 874 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 875 if (nlh == NULL) 876 return -EMSGSIZE; 877 878 ifm = nlmsg_data(nlh); 879 ifm->ifi_family = AF_UNSPEC; 880 ifm->__ifi_pad = 0; 881 ifm->ifi_type = dev->type; 882 ifm->ifi_index = dev->ifindex; 883 ifm->ifi_flags = dev_get_flags(dev); 884 ifm->ifi_change = change; 885 886 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 887 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 888 nla_put_u8(skb, IFLA_OPERSTATE, 889 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 890 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 891 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 892 nla_put_u32(skb, IFLA_GROUP, dev->group) || 893 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 894 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 895 #ifdef CONFIG_RPS 896 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 897 #endif 898 (dev->ifindex != dev->iflink && 899 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 900 (dev->master && 901 nla_put_u32(skb, IFLA_MASTER, dev->master->ifindex)) || 902 (dev->qdisc && 903 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 904 (dev->ifalias && 905 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias))) 906 goto nla_put_failure; 907 908 if (1) { 909 struct rtnl_link_ifmap map = { 910 .mem_start = dev->mem_start, 911 .mem_end = dev->mem_end, 912 .base_addr = dev->base_addr, 913 .irq = dev->irq, 914 .dma = dev->dma, 915 .port = dev->if_port, 916 }; 917 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 918 goto nla_put_failure; 919 } 920 921 if (dev->addr_len) { 922 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 923 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 924 goto nla_put_failure; 925 } 926 927 attr = nla_reserve(skb, IFLA_STATS, 928 sizeof(struct rtnl_link_stats)); 929 if (attr == NULL) 930 goto nla_put_failure; 931 932 stats = dev_get_stats(dev, &temp); 933 copy_rtnl_link_stats(nla_data(attr), stats); 934 935 attr = nla_reserve(skb, IFLA_STATS64, 936 sizeof(struct rtnl_link_stats64)); 937 if (attr == NULL) 938 goto nla_put_failure; 939 copy_rtnl_link_stats64(nla_data(attr), stats); 940 941 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 942 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 943 goto nla_put_failure; 944 945 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 946 && (ext_filter_mask & RTEXT_FILTER_VF)) { 947 int i; 948 949 struct nlattr *vfinfo, *vf; 950 int num_vfs = dev_num_vf(dev->dev.parent); 951 952 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 953 if (!vfinfo) 954 goto nla_put_failure; 955 for (i = 0; i < num_vfs; i++) { 956 struct ifla_vf_info ivi; 957 struct ifla_vf_mac vf_mac; 958 struct ifla_vf_vlan vf_vlan; 959 struct ifla_vf_tx_rate vf_tx_rate; 960 struct ifla_vf_spoofchk vf_spoofchk; 961 962 /* 963 * Not all SR-IOV capable drivers support the 964 * spoofcheck query. Preset to -1 so the user 965 * space tool can detect that the driver didn't 966 * report anything. 967 */ 968 ivi.spoofchk = -1; 969 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 970 break; 971 vf_mac.vf = 972 vf_vlan.vf = 973 vf_tx_rate.vf = 974 vf_spoofchk.vf = ivi.vf; 975 976 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 977 vf_vlan.vlan = ivi.vlan; 978 vf_vlan.qos = ivi.qos; 979 vf_tx_rate.rate = ivi.tx_rate; 980 vf_spoofchk.setting = ivi.spoofchk; 981 vf = nla_nest_start(skb, IFLA_VF_INFO); 982 if (!vf) { 983 nla_nest_cancel(skb, vfinfo); 984 goto nla_put_failure; 985 } 986 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 987 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 988 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 989 &vf_tx_rate) || 990 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 991 &vf_spoofchk)) 992 goto nla_put_failure; 993 nla_nest_end(skb, vf); 994 } 995 nla_nest_end(skb, vfinfo); 996 } 997 998 if (rtnl_port_fill(skb, dev)) 999 goto nla_put_failure; 1000 1001 if (dev->rtnl_link_ops) { 1002 if (rtnl_link_fill(skb, dev) < 0) 1003 goto nla_put_failure; 1004 } 1005 1006 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1007 goto nla_put_failure; 1008 1009 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1010 if (af_ops->fill_link_af) { 1011 struct nlattr *af; 1012 int err; 1013 1014 if (!(af = nla_nest_start(skb, af_ops->family))) 1015 goto nla_put_failure; 1016 1017 err = af_ops->fill_link_af(skb, dev); 1018 1019 /* 1020 * Caller may return ENODATA to indicate that there 1021 * was no data to be dumped. This is not an error, it 1022 * means we should trim the attribute header and 1023 * continue. 1024 */ 1025 if (err == -ENODATA) 1026 nla_nest_cancel(skb, af); 1027 else if (err < 0) 1028 goto nla_put_failure; 1029 1030 nla_nest_end(skb, af); 1031 } 1032 } 1033 1034 nla_nest_end(skb, af_spec); 1035 1036 return nlmsg_end(skb, nlh); 1037 1038 nla_put_failure: 1039 nlmsg_cancel(skb, nlh); 1040 return -EMSGSIZE; 1041 } 1042 1043 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1044 { 1045 struct net *net = sock_net(skb->sk); 1046 int h, s_h; 1047 int idx = 0, s_idx; 1048 struct net_device *dev; 1049 struct hlist_head *head; 1050 struct hlist_node *node; 1051 struct nlattr *tb[IFLA_MAX+1]; 1052 u32 ext_filter_mask = 0; 1053 1054 s_h = cb->args[0]; 1055 s_idx = cb->args[1]; 1056 1057 rcu_read_lock(); 1058 cb->seq = net->dev_base_seq; 1059 1060 if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1061 ifla_policy) >= 0) { 1062 1063 if (tb[IFLA_EXT_MASK]) 1064 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1065 } 1066 1067 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1068 idx = 0; 1069 head = &net->dev_index_head[h]; 1070 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 1071 if (idx < s_idx) 1072 goto cont; 1073 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1074 NETLINK_CB(cb->skb).pid, 1075 cb->nlh->nlmsg_seq, 0, 1076 NLM_F_MULTI, 1077 ext_filter_mask) <= 0) 1078 goto out; 1079 1080 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1081 cont: 1082 idx++; 1083 } 1084 } 1085 out: 1086 rcu_read_unlock(); 1087 cb->args[1] = idx; 1088 cb->args[0] = h; 1089 1090 return skb->len; 1091 } 1092 1093 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1094 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1095 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1096 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1097 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1098 [IFLA_MTU] = { .type = NLA_U32 }, 1099 [IFLA_LINK] = { .type = NLA_U32 }, 1100 [IFLA_MASTER] = { .type = NLA_U32 }, 1101 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1102 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1103 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1104 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1105 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1106 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1107 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1108 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1109 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1110 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1111 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1112 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1113 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1114 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1115 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1116 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1117 }; 1118 EXPORT_SYMBOL(ifla_policy); 1119 1120 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1121 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1122 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1123 }; 1124 1125 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1126 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1127 }; 1128 1129 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1130 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1131 .len = sizeof(struct ifla_vf_mac) }, 1132 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1133 .len = sizeof(struct ifla_vf_vlan) }, 1134 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1135 .len = sizeof(struct ifla_vf_tx_rate) }, 1136 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1137 .len = sizeof(struct ifla_vf_spoofchk) }, 1138 }; 1139 1140 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1141 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1142 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1143 .len = PORT_PROFILE_MAX }, 1144 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1145 .len = sizeof(struct ifla_port_vsi)}, 1146 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1147 .len = PORT_UUID_MAX }, 1148 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1149 .len = PORT_UUID_MAX }, 1150 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1151 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1152 }; 1153 1154 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1155 { 1156 struct net *net; 1157 /* Examine the link attributes and figure out which 1158 * network namespace we are talking about. 1159 */ 1160 if (tb[IFLA_NET_NS_PID]) 1161 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1162 else if (tb[IFLA_NET_NS_FD]) 1163 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1164 else 1165 net = get_net(src_net); 1166 return net; 1167 } 1168 EXPORT_SYMBOL(rtnl_link_get_net); 1169 1170 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1171 { 1172 if (dev) { 1173 if (tb[IFLA_ADDRESS] && 1174 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1175 return -EINVAL; 1176 1177 if (tb[IFLA_BROADCAST] && 1178 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1179 return -EINVAL; 1180 } 1181 1182 if (tb[IFLA_AF_SPEC]) { 1183 struct nlattr *af; 1184 int rem, err; 1185 1186 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1187 const struct rtnl_af_ops *af_ops; 1188 1189 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1190 return -EAFNOSUPPORT; 1191 1192 if (!af_ops->set_link_af) 1193 return -EOPNOTSUPP; 1194 1195 if (af_ops->validate_link_af) { 1196 err = af_ops->validate_link_af(dev, af); 1197 if (err < 0) 1198 return err; 1199 } 1200 } 1201 } 1202 1203 return 0; 1204 } 1205 1206 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1207 { 1208 int rem, err = -EINVAL; 1209 struct nlattr *vf; 1210 const struct net_device_ops *ops = dev->netdev_ops; 1211 1212 nla_for_each_nested(vf, attr, rem) { 1213 switch (nla_type(vf)) { 1214 case IFLA_VF_MAC: { 1215 struct ifla_vf_mac *ivm; 1216 ivm = nla_data(vf); 1217 err = -EOPNOTSUPP; 1218 if (ops->ndo_set_vf_mac) 1219 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1220 ivm->mac); 1221 break; 1222 } 1223 case IFLA_VF_VLAN: { 1224 struct ifla_vf_vlan *ivv; 1225 ivv = nla_data(vf); 1226 err = -EOPNOTSUPP; 1227 if (ops->ndo_set_vf_vlan) 1228 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1229 ivv->vlan, 1230 ivv->qos); 1231 break; 1232 } 1233 case IFLA_VF_TX_RATE: { 1234 struct ifla_vf_tx_rate *ivt; 1235 ivt = nla_data(vf); 1236 err = -EOPNOTSUPP; 1237 if (ops->ndo_set_vf_tx_rate) 1238 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1239 ivt->rate); 1240 break; 1241 } 1242 case IFLA_VF_SPOOFCHK: { 1243 struct ifla_vf_spoofchk *ivs; 1244 ivs = nla_data(vf); 1245 err = -EOPNOTSUPP; 1246 if (ops->ndo_set_vf_spoofchk) 1247 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1248 ivs->setting); 1249 break; 1250 } 1251 default: 1252 err = -EINVAL; 1253 break; 1254 } 1255 if (err) 1256 break; 1257 } 1258 return err; 1259 } 1260 1261 static int do_set_master(struct net_device *dev, int ifindex) 1262 { 1263 struct net_device *master_dev; 1264 const struct net_device_ops *ops; 1265 int err; 1266 1267 if (dev->master) { 1268 if (dev->master->ifindex == ifindex) 1269 return 0; 1270 ops = dev->master->netdev_ops; 1271 if (ops->ndo_del_slave) { 1272 err = ops->ndo_del_slave(dev->master, dev); 1273 if (err) 1274 return err; 1275 } else { 1276 return -EOPNOTSUPP; 1277 } 1278 } 1279 1280 if (ifindex) { 1281 master_dev = __dev_get_by_index(dev_net(dev), ifindex); 1282 if (!master_dev) 1283 return -EINVAL; 1284 ops = master_dev->netdev_ops; 1285 if (ops->ndo_add_slave) { 1286 err = ops->ndo_add_slave(master_dev, dev); 1287 if (err) 1288 return err; 1289 } else { 1290 return -EOPNOTSUPP; 1291 } 1292 } 1293 return 0; 1294 } 1295 1296 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1297 struct nlattr **tb, char *ifname, int modified) 1298 { 1299 const struct net_device_ops *ops = dev->netdev_ops; 1300 int send_addr_notify = 0; 1301 int err; 1302 1303 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1304 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1305 if (IS_ERR(net)) { 1306 err = PTR_ERR(net); 1307 goto errout; 1308 } 1309 err = dev_change_net_namespace(dev, net, ifname); 1310 put_net(net); 1311 if (err) 1312 goto errout; 1313 modified = 1; 1314 } 1315 1316 if (tb[IFLA_MAP]) { 1317 struct rtnl_link_ifmap *u_map; 1318 struct ifmap k_map; 1319 1320 if (!ops->ndo_set_config) { 1321 err = -EOPNOTSUPP; 1322 goto errout; 1323 } 1324 1325 if (!netif_device_present(dev)) { 1326 err = -ENODEV; 1327 goto errout; 1328 } 1329 1330 u_map = nla_data(tb[IFLA_MAP]); 1331 k_map.mem_start = (unsigned long) u_map->mem_start; 1332 k_map.mem_end = (unsigned long) u_map->mem_end; 1333 k_map.base_addr = (unsigned short) u_map->base_addr; 1334 k_map.irq = (unsigned char) u_map->irq; 1335 k_map.dma = (unsigned char) u_map->dma; 1336 k_map.port = (unsigned char) u_map->port; 1337 1338 err = ops->ndo_set_config(dev, &k_map); 1339 if (err < 0) 1340 goto errout; 1341 1342 modified = 1; 1343 } 1344 1345 if (tb[IFLA_ADDRESS]) { 1346 struct sockaddr *sa; 1347 int len; 1348 1349 if (!ops->ndo_set_mac_address) { 1350 err = -EOPNOTSUPP; 1351 goto errout; 1352 } 1353 1354 if (!netif_device_present(dev)) { 1355 err = -ENODEV; 1356 goto errout; 1357 } 1358 1359 len = sizeof(sa_family_t) + dev->addr_len; 1360 sa = kmalloc(len, GFP_KERNEL); 1361 if (!sa) { 1362 err = -ENOMEM; 1363 goto errout; 1364 } 1365 sa->sa_family = dev->type; 1366 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1367 dev->addr_len); 1368 err = ops->ndo_set_mac_address(dev, sa); 1369 kfree(sa); 1370 if (err) 1371 goto errout; 1372 send_addr_notify = 1; 1373 modified = 1; 1374 } 1375 1376 if (tb[IFLA_MTU]) { 1377 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1378 if (err < 0) 1379 goto errout; 1380 modified = 1; 1381 } 1382 1383 if (tb[IFLA_GROUP]) { 1384 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1385 modified = 1; 1386 } 1387 1388 /* 1389 * Interface selected by interface index but interface 1390 * name provided implies that a name change has been 1391 * requested. 1392 */ 1393 if (ifm->ifi_index > 0 && ifname[0]) { 1394 err = dev_change_name(dev, ifname); 1395 if (err < 0) 1396 goto errout; 1397 modified = 1; 1398 } 1399 1400 if (tb[IFLA_IFALIAS]) { 1401 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1402 nla_len(tb[IFLA_IFALIAS])); 1403 if (err < 0) 1404 goto errout; 1405 modified = 1; 1406 } 1407 1408 if (tb[IFLA_BROADCAST]) { 1409 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1410 send_addr_notify = 1; 1411 } 1412 1413 if (ifm->ifi_flags || ifm->ifi_change) { 1414 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1415 if (err < 0) 1416 goto errout; 1417 } 1418 1419 if (tb[IFLA_MASTER]) { 1420 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1421 if (err) 1422 goto errout; 1423 modified = 1; 1424 } 1425 1426 if (tb[IFLA_TXQLEN]) 1427 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1428 1429 if (tb[IFLA_OPERSTATE]) 1430 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1431 1432 if (tb[IFLA_LINKMODE]) { 1433 write_lock_bh(&dev_base_lock); 1434 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1435 write_unlock_bh(&dev_base_lock); 1436 } 1437 1438 if (tb[IFLA_VFINFO_LIST]) { 1439 struct nlattr *attr; 1440 int rem; 1441 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1442 if (nla_type(attr) != IFLA_VF_INFO) { 1443 err = -EINVAL; 1444 goto errout; 1445 } 1446 err = do_setvfinfo(dev, attr); 1447 if (err < 0) 1448 goto errout; 1449 modified = 1; 1450 } 1451 } 1452 err = 0; 1453 1454 if (tb[IFLA_VF_PORTS]) { 1455 struct nlattr *port[IFLA_PORT_MAX+1]; 1456 struct nlattr *attr; 1457 int vf; 1458 int rem; 1459 1460 err = -EOPNOTSUPP; 1461 if (!ops->ndo_set_vf_port) 1462 goto errout; 1463 1464 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1465 if (nla_type(attr) != IFLA_VF_PORT) 1466 continue; 1467 err = nla_parse_nested(port, IFLA_PORT_MAX, 1468 attr, ifla_port_policy); 1469 if (err < 0) 1470 goto errout; 1471 if (!port[IFLA_PORT_VF]) { 1472 err = -EOPNOTSUPP; 1473 goto errout; 1474 } 1475 vf = nla_get_u32(port[IFLA_PORT_VF]); 1476 err = ops->ndo_set_vf_port(dev, vf, port); 1477 if (err < 0) 1478 goto errout; 1479 modified = 1; 1480 } 1481 } 1482 err = 0; 1483 1484 if (tb[IFLA_PORT_SELF]) { 1485 struct nlattr *port[IFLA_PORT_MAX+1]; 1486 1487 err = nla_parse_nested(port, IFLA_PORT_MAX, 1488 tb[IFLA_PORT_SELF], ifla_port_policy); 1489 if (err < 0) 1490 goto errout; 1491 1492 err = -EOPNOTSUPP; 1493 if (ops->ndo_set_vf_port) 1494 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1495 if (err < 0) 1496 goto errout; 1497 modified = 1; 1498 } 1499 1500 if (tb[IFLA_AF_SPEC]) { 1501 struct nlattr *af; 1502 int rem; 1503 1504 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1505 const struct rtnl_af_ops *af_ops; 1506 1507 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1508 BUG(); 1509 1510 err = af_ops->set_link_af(dev, af); 1511 if (err < 0) 1512 goto errout; 1513 1514 modified = 1; 1515 } 1516 } 1517 err = 0; 1518 1519 errout: 1520 if (err < 0 && modified) 1521 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", 1522 dev->name); 1523 1524 if (send_addr_notify) 1525 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1526 1527 return err; 1528 } 1529 1530 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1531 { 1532 struct net *net = sock_net(skb->sk); 1533 struct ifinfomsg *ifm; 1534 struct net_device *dev; 1535 int err; 1536 struct nlattr *tb[IFLA_MAX+1]; 1537 char ifname[IFNAMSIZ]; 1538 1539 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1540 if (err < 0) 1541 goto errout; 1542 1543 if (tb[IFLA_IFNAME]) 1544 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1545 else 1546 ifname[0] = '\0'; 1547 1548 err = -EINVAL; 1549 ifm = nlmsg_data(nlh); 1550 if (ifm->ifi_index > 0) 1551 dev = __dev_get_by_index(net, ifm->ifi_index); 1552 else if (tb[IFLA_IFNAME]) 1553 dev = __dev_get_by_name(net, ifname); 1554 else 1555 goto errout; 1556 1557 if (dev == NULL) { 1558 err = -ENODEV; 1559 goto errout; 1560 } 1561 1562 err = validate_linkmsg(dev, tb); 1563 if (err < 0) 1564 goto errout; 1565 1566 err = do_setlink(dev, ifm, tb, ifname, 0); 1567 errout: 1568 return err; 1569 } 1570 1571 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1572 { 1573 struct net *net = sock_net(skb->sk); 1574 const struct rtnl_link_ops *ops; 1575 struct net_device *dev; 1576 struct ifinfomsg *ifm; 1577 char ifname[IFNAMSIZ]; 1578 struct nlattr *tb[IFLA_MAX+1]; 1579 int err; 1580 LIST_HEAD(list_kill); 1581 1582 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1583 if (err < 0) 1584 return err; 1585 1586 if (tb[IFLA_IFNAME]) 1587 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1588 1589 ifm = nlmsg_data(nlh); 1590 if (ifm->ifi_index > 0) 1591 dev = __dev_get_by_index(net, ifm->ifi_index); 1592 else if (tb[IFLA_IFNAME]) 1593 dev = __dev_get_by_name(net, ifname); 1594 else 1595 return -EINVAL; 1596 1597 if (!dev) 1598 return -ENODEV; 1599 1600 ops = dev->rtnl_link_ops; 1601 if (!ops) 1602 return -EOPNOTSUPP; 1603 1604 ops->dellink(dev, &list_kill); 1605 unregister_netdevice_many(&list_kill); 1606 list_del(&list_kill); 1607 return 0; 1608 } 1609 1610 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1611 { 1612 unsigned int old_flags; 1613 int err; 1614 1615 old_flags = dev->flags; 1616 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1617 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1618 if (err < 0) 1619 return err; 1620 } 1621 1622 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1623 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1624 1625 __dev_notify_flags(dev, old_flags); 1626 return 0; 1627 } 1628 EXPORT_SYMBOL(rtnl_configure_link); 1629 1630 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1631 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1632 { 1633 int err; 1634 struct net_device *dev; 1635 unsigned int num_tx_queues = 1; 1636 unsigned int num_rx_queues = 1; 1637 1638 if (tb[IFLA_NUM_TX_QUEUES]) 1639 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1640 else if (ops->get_num_tx_queues) 1641 num_tx_queues = ops->get_num_tx_queues(); 1642 1643 if (tb[IFLA_NUM_RX_QUEUES]) 1644 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1645 else if (ops->get_num_rx_queues) 1646 num_rx_queues = ops->get_num_rx_queues(); 1647 1648 err = -ENOMEM; 1649 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup, 1650 num_tx_queues, num_rx_queues); 1651 if (!dev) 1652 goto err; 1653 1654 dev_net_set(dev, net); 1655 dev->rtnl_link_ops = ops; 1656 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1657 1658 if (tb[IFLA_MTU]) 1659 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1660 if (tb[IFLA_ADDRESS]) 1661 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1662 nla_len(tb[IFLA_ADDRESS])); 1663 if (tb[IFLA_BROADCAST]) 1664 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1665 nla_len(tb[IFLA_BROADCAST])); 1666 if (tb[IFLA_TXQLEN]) 1667 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1668 if (tb[IFLA_OPERSTATE]) 1669 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1670 if (tb[IFLA_LINKMODE]) 1671 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1672 if (tb[IFLA_GROUP]) 1673 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1674 1675 return dev; 1676 1677 err: 1678 return ERR_PTR(err); 1679 } 1680 EXPORT_SYMBOL(rtnl_create_link); 1681 1682 static int rtnl_group_changelink(struct net *net, int group, 1683 struct ifinfomsg *ifm, 1684 struct nlattr **tb) 1685 { 1686 struct net_device *dev; 1687 int err; 1688 1689 for_each_netdev(net, dev) { 1690 if (dev->group == group) { 1691 err = do_setlink(dev, ifm, tb, NULL, 0); 1692 if (err < 0) 1693 return err; 1694 } 1695 } 1696 1697 return 0; 1698 } 1699 1700 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1701 { 1702 struct net *net = sock_net(skb->sk); 1703 const struct rtnl_link_ops *ops; 1704 struct net_device *dev; 1705 struct ifinfomsg *ifm; 1706 char kind[MODULE_NAME_LEN]; 1707 char ifname[IFNAMSIZ]; 1708 struct nlattr *tb[IFLA_MAX+1]; 1709 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1710 int err; 1711 1712 #ifdef CONFIG_MODULES 1713 replay: 1714 #endif 1715 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1716 if (err < 0) 1717 return err; 1718 1719 if (tb[IFLA_IFNAME]) 1720 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1721 else 1722 ifname[0] = '\0'; 1723 1724 ifm = nlmsg_data(nlh); 1725 if (ifm->ifi_index > 0) 1726 dev = __dev_get_by_index(net, ifm->ifi_index); 1727 else { 1728 if (ifname[0]) 1729 dev = __dev_get_by_name(net, ifname); 1730 else 1731 dev = NULL; 1732 } 1733 1734 err = validate_linkmsg(dev, tb); 1735 if (err < 0) 1736 return err; 1737 1738 if (tb[IFLA_LINKINFO]) { 1739 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1740 tb[IFLA_LINKINFO], ifla_info_policy); 1741 if (err < 0) 1742 return err; 1743 } else 1744 memset(linkinfo, 0, sizeof(linkinfo)); 1745 1746 if (linkinfo[IFLA_INFO_KIND]) { 1747 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1748 ops = rtnl_link_ops_get(kind); 1749 } else { 1750 kind[0] = '\0'; 1751 ops = NULL; 1752 } 1753 1754 if (1) { 1755 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1756 struct net *dest_net; 1757 1758 if (ops) { 1759 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1760 err = nla_parse_nested(attr, ops->maxtype, 1761 linkinfo[IFLA_INFO_DATA], 1762 ops->policy); 1763 if (err < 0) 1764 return err; 1765 data = attr; 1766 } 1767 if (ops->validate) { 1768 err = ops->validate(tb, data); 1769 if (err < 0) 1770 return err; 1771 } 1772 } 1773 1774 if (dev) { 1775 int modified = 0; 1776 1777 if (nlh->nlmsg_flags & NLM_F_EXCL) 1778 return -EEXIST; 1779 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1780 return -EOPNOTSUPP; 1781 1782 if (linkinfo[IFLA_INFO_DATA]) { 1783 if (!ops || ops != dev->rtnl_link_ops || 1784 !ops->changelink) 1785 return -EOPNOTSUPP; 1786 1787 err = ops->changelink(dev, tb, data); 1788 if (err < 0) 1789 return err; 1790 modified = 1; 1791 } 1792 1793 return do_setlink(dev, ifm, tb, ifname, modified); 1794 } 1795 1796 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1797 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1798 return rtnl_group_changelink(net, 1799 nla_get_u32(tb[IFLA_GROUP]), 1800 ifm, tb); 1801 return -ENODEV; 1802 } 1803 1804 if (ifm->ifi_index) 1805 return -EOPNOTSUPP; 1806 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1807 return -EOPNOTSUPP; 1808 1809 if (!ops) { 1810 #ifdef CONFIG_MODULES 1811 if (kind[0]) { 1812 __rtnl_unlock(); 1813 request_module("rtnl-link-%s", kind); 1814 rtnl_lock(); 1815 ops = rtnl_link_ops_get(kind); 1816 if (ops) 1817 goto replay; 1818 } 1819 #endif 1820 return -EOPNOTSUPP; 1821 } 1822 1823 if (!ifname[0]) 1824 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1825 1826 dest_net = rtnl_link_get_net(net, tb); 1827 if (IS_ERR(dest_net)) 1828 return PTR_ERR(dest_net); 1829 1830 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1831 1832 if (IS_ERR(dev)) 1833 err = PTR_ERR(dev); 1834 else if (ops->newlink) 1835 err = ops->newlink(net, dev, tb, data); 1836 else 1837 err = register_netdevice(dev); 1838 1839 if (err < 0 && !IS_ERR(dev)) 1840 free_netdev(dev); 1841 if (err < 0) 1842 goto out; 1843 1844 err = rtnl_configure_link(dev, ifm); 1845 if (err < 0) 1846 unregister_netdevice(dev); 1847 out: 1848 put_net(dest_net); 1849 return err; 1850 } 1851 } 1852 1853 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1854 { 1855 struct net *net = sock_net(skb->sk); 1856 struct ifinfomsg *ifm; 1857 char ifname[IFNAMSIZ]; 1858 struct nlattr *tb[IFLA_MAX+1]; 1859 struct net_device *dev = NULL; 1860 struct sk_buff *nskb; 1861 int err; 1862 u32 ext_filter_mask = 0; 1863 1864 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1865 if (err < 0) 1866 return err; 1867 1868 if (tb[IFLA_IFNAME]) 1869 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1870 1871 if (tb[IFLA_EXT_MASK]) 1872 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1873 1874 ifm = nlmsg_data(nlh); 1875 if (ifm->ifi_index > 0) 1876 dev = __dev_get_by_index(net, ifm->ifi_index); 1877 else if (tb[IFLA_IFNAME]) 1878 dev = __dev_get_by_name(net, ifname); 1879 else 1880 return -EINVAL; 1881 1882 if (dev == NULL) 1883 return -ENODEV; 1884 1885 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1886 if (nskb == NULL) 1887 return -ENOBUFS; 1888 1889 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1890 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1891 if (err < 0) { 1892 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1893 WARN_ON(err == -EMSGSIZE); 1894 kfree_skb(nskb); 1895 } else 1896 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1897 1898 return err; 1899 } 1900 1901 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1902 { 1903 struct net *net = sock_net(skb->sk); 1904 struct net_device *dev; 1905 struct nlattr *tb[IFLA_MAX+1]; 1906 u32 ext_filter_mask = 0; 1907 u16 min_ifinfo_dump_size = 0; 1908 1909 if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1910 ifla_policy) >= 0) { 1911 if (tb[IFLA_EXT_MASK]) 1912 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1913 } 1914 1915 if (!ext_filter_mask) 1916 return NLMSG_GOODSIZE; 1917 /* 1918 * traverse the list of net devices and compute the minimum 1919 * buffer size based upon the filter mask. 1920 */ 1921 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1922 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1923 if_nlmsg_size(dev, 1924 ext_filter_mask)); 1925 } 1926 1927 return min_ifinfo_dump_size; 1928 } 1929 1930 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1931 { 1932 int idx; 1933 int s_idx = cb->family; 1934 1935 if (s_idx == 0) 1936 s_idx = 1; 1937 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1938 int type = cb->nlh->nlmsg_type-RTM_BASE; 1939 if (idx < s_idx || idx == PF_PACKET) 1940 continue; 1941 if (rtnl_msg_handlers[idx] == NULL || 1942 rtnl_msg_handlers[idx][type].dumpit == NULL) 1943 continue; 1944 if (idx > s_idx) 1945 memset(&cb->args[0], 0, sizeof(cb->args)); 1946 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1947 break; 1948 } 1949 cb->family = idx; 1950 1951 return skb->len; 1952 } 1953 1954 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change) 1955 { 1956 struct net *net = dev_net(dev); 1957 struct sk_buff *skb; 1958 int err = -ENOBUFS; 1959 size_t if_info_size; 1960 1961 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL); 1962 if (skb == NULL) 1963 goto errout; 1964 1965 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 1966 if (err < 0) { 1967 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1968 WARN_ON(err == -EMSGSIZE); 1969 kfree_skb(skb); 1970 goto errout; 1971 } 1972 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1973 return; 1974 errout: 1975 if (err < 0) 1976 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1977 } 1978 1979 static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 1980 struct net_device *dev, 1981 u8 *addr, u32 pid, u32 seq, 1982 int type, unsigned int flags) 1983 { 1984 struct nlmsghdr *nlh; 1985 struct ndmsg *ndm; 1986 1987 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI); 1988 if (!nlh) 1989 return -EMSGSIZE; 1990 1991 ndm = nlmsg_data(nlh); 1992 ndm->ndm_family = AF_BRIDGE; 1993 ndm->ndm_pad1 = 0; 1994 ndm->ndm_pad2 = 0; 1995 ndm->ndm_flags = flags; 1996 ndm->ndm_type = 0; 1997 ndm->ndm_ifindex = dev->ifindex; 1998 ndm->ndm_state = NUD_PERMANENT; 1999 2000 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2001 goto nla_put_failure; 2002 2003 return nlmsg_end(skb, nlh); 2004 2005 nla_put_failure: 2006 nlmsg_cancel(skb, nlh); 2007 return -EMSGSIZE; 2008 } 2009 2010 static inline size_t rtnl_fdb_nlmsg_size(void) 2011 { 2012 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2013 } 2014 2015 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2016 { 2017 struct net *net = dev_net(dev); 2018 struct sk_buff *skb; 2019 int err = -ENOBUFS; 2020 2021 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2022 if (!skb) 2023 goto errout; 2024 2025 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF); 2026 if (err < 0) { 2027 kfree_skb(skb); 2028 goto errout; 2029 } 2030 2031 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2032 return; 2033 errout: 2034 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2035 } 2036 2037 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2038 { 2039 struct net *net = sock_net(skb->sk); 2040 struct net_device *master = NULL; 2041 struct ndmsg *ndm; 2042 struct nlattr *tb[NDA_MAX+1]; 2043 struct net_device *dev; 2044 u8 *addr; 2045 int err; 2046 2047 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2048 if (err < 0) 2049 return err; 2050 2051 ndm = nlmsg_data(nlh); 2052 if (ndm->ndm_ifindex == 0) { 2053 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2054 return -EINVAL; 2055 } 2056 2057 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2058 if (dev == NULL) { 2059 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2060 return -ENODEV; 2061 } 2062 2063 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2064 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2065 return -EINVAL; 2066 } 2067 2068 addr = nla_data(tb[NDA_LLADDR]); 2069 if (!is_valid_ether_addr(addr)) { 2070 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n"); 2071 return -EINVAL; 2072 } 2073 2074 err = -EOPNOTSUPP; 2075 2076 /* Support fdb on master device the net/bridge default case */ 2077 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2078 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2079 master = dev->master; 2080 err = master->netdev_ops->ndo_fdb_add(ndm, dev, addr, 2081 nlh->nlmsg_flags); 2082 if (err) 2083 goto out; 2084 else 2085 ndm->ndm_flags &= ~NTF_MASTER; 2086 } 2087 2088 /* Embedded bridge, macvlan, and any other device support */ 2089 if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_add) { 2090 err = dev->netdev_ops->ndo_fdb_add(ndm, dev, addr, 2091 nlh->nlmsg_flags); 2092 2093 if (!err) { 2094 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2095 ndm->ndm_flags &= ~NTF_SELF; 2096 } 2097 } 2098 out: 2099 return err; 2100 } 2101 2102 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2103 { 2104 struct net *net = sock_net(skb->sk); 2105 struct ndmsg *ndm; 2106 struct nlattr *llattr; 2107 struct net_device *dev; 2108 int err = -EINVAL; 2109 __u8 *addr; 2110 2111 if (nlmsg_len(nlh) < sizeof(*ndm)) 2112 return -EINVAL; 2113 2114 ndm = nlmsg_data(nlh); 2115 if (ndm->ndm_ifindex == 0) { 2116 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2117 return -EINVAL; 2118 } 2119 2120 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2121 if (dev == NULL) { 2122 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2123 return -ENODEV; 2124 } 2125 2126 llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR); 2127 if (llattr == NULL || nla_len(llattr) != ETH_ALEN) { 2128 pr_info("PF_BRIGDE: RTM_DELNEIGH with invalid address\n"); 2129 return -EINVAL; 2130 } 2131 2132 addr = nla_data(llattr); 2133 err = -EOPNOTSUPP; 2134 2135 /* Support fdb on master device the net/bridge default case */ 2136 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2137 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2138 struct net_device *master = dev->master; 2139 2140 if (master->netdev_ops->ndo_fdb_del) 2141 err = master->netdev_ops->ndo_fdb_del(ndm, dev, addr); 2142 2143 if (err) 2144 goto out; 2145 else 2146 ndm->ndm_flags &= ~NTF_MASTER; 2147 } 2148 2149 /* Embedded bridge, macvlan, and any other device support */ 2150 if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_del) { 2151 err = dev->netdev_ops->ndo_fdb_del(ndm, dev, addr); 2152 2153 if (!err) { 2154 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2155 ndm->ndm_flags &= ~NTF_SELF; 2156 } 2157 } 2158 out: 2159 return err; 2160 } 2161 2162 static int nlmsg_populate_fdb(struct sk_buff *skb, 2163 struct netlink_callback *cb, 2164 struct net_device *dev, 2165 int *idx, 2166 struct netdev_hw_addr_list *list) 2167 { 2168 struct netdev_hw_addr *ha; 2169 int err; 2170 u32 pid, seq; 2171 2172 pid = NETLINK_CB(cb->skb).pid; 2173 seq = cb->nlh->nlmsg_seq; 2174 2175 list_for_each_entry(ha, &list->list, list) { 2176 if (*idx < cb->args[0]) 2177 goto skip; 2178 2179 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2180 pid, seq, 0, NTF_SELF); 2181 if (err < 0) 2182 return err; 2183 skip: 2184 *idx += 1; 2185 } 2186 return 0; 2187 } 2188 2189 /** 2190 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2191 * @nlh: netlink message header 2192 * @dev: netdevice 2193 * 2194 * Default netdevice operation to dump the existing unicast address list. 2195 * Returns zero on success. 2196 */ 2197 int ndo_dflt_fdb_dump(struct sk_buff *skb, 2198 struct netlink_callback *cb, 2199 struct net_device *dev, 2200 int idx) 2201 { 2202 int err; 2203 2204 netif_addr_lock_bh(dev); 2205 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2206 if (err) 2207 goto out; 2208 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2209 out: 2210 netif_addr_unlock_bh(dev); 2211 return idx; 2212 } 2213 EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2214 2215 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2216 { 2217 int idx = 0; 2218 struct net *net = sock_net(skb->sk); 2219 struct net_device *dev; 2220 2221 rcu_read_lock(); 2222 for_each_netdev_rcu(net, dev) { 2223 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2224 struct net_device *master = dev->master; 2225 const struct net_device_ops *ops = master->netdev_ops; 2226 2227 if (ops->ndo_fdb_dump) 2228 idx = ops->ndo_fdb_dump(skb, cb, dev, idx); 2229 } 2230 2231 if (dev->netdev_ops->ndo_fdb_dump) 2232 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx); 2233 } 2234 rcu_read_unlock(); 2235 2236 cb->args[0] = idx; 2237 return skb->len; 2238 } 2239 2240 /* Protected by RTNL sempahore. */ 2241 static struct rtattr **rta_buf; 2242 static int rtattr_max; 2243 2244 /* Process one rtnetlink message. */ 2245 2246 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2247 { 2248 struct net *net = sock_net(skb->sk); 2249 rtnl_doit_func doit; 2250 int sz_idx, kind; 2251 int min_len; 2252 int family; 2253 int type; 2254 int err; 2255 2256 type = nlh->nlmsg_type; 2257 if (type > RTM_MAX) 2258 return -EOPNOTSUPP; 2259 2260 type -= RTM_BASE; 2261 2262 /* All the messages must have at least 1 byte length */ 2263 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 2264 return 0; 2265 2266 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 2267 sz_idx = type>>2; 2268 kind = type&3; 2269 2270 if (kind != 2 && !capable(CAP_NET_ADMIN)) 2271 return -EPERM; 2272 2273 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2274 struct sock *rtnl; 2275 rtnl_dumpit_func dumpit; 2276 rtnl_calcit_func calcit; 2277 u16 min_dump_alloc = 0; 2278 2279 dumpit = rtnl_get_dumpit(family, type); 2280 if (dumpit == NULL) 2281 return -EOPNOTSUPP; 2282 calcit = rtnl_get_calcit(family, type); 2283 if (calcit) 2284 min_dump_alloc = calcit(skb, nlh); 2285 2286 __rtnl_unlock(); 2287 rtnl = net->rtnl; 2288 { 2289 struct netlink_dump_control c = { 2290 .dump = dumpit, 2291 .min_dump_alloc = min_dump_alloc, 2292 }; 2293 err = netlink_dump_start(rtnl, skb, nlh, &c); 2294 } 2295 rtnl_lock(); 2296 return err; 2297 } 2298 2299 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 2300 2301 min_len = rtm_min[sz_idx]; 2302 if (nlh->nlmsg_len < min_len) 2303 return -EINVAL; 2304 2305 if (nlh->nlmsg_len > min_len) { 2306 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 2307 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 2308 2309 while (RTA_OK(attr, attrlen)) { 2310 unsigned int flavor = attr->rta_type; 2311 if (flavor) { 2312 if (flavor > rta_max[sz_idx]) 2313 return -EINVAL; 2314 rta_buf[flavor-1] = attr; 2315 } 2316 attr = RTA_NEXT(attr, attrlen); 2317 } 2318 } 2319 2320 doit = rtnl_get_doit(family, type); 2321 if (doit == NULL) 2322 return -EOPNOTSUPP; 2323 2324 return doit(skb, nlh, (void *)&rta_buf[0]); 2325 } 2326 2327 static void rtnetlink_rcv(struct sk_buff *skb) 2328 { 2329 rtnl_lock(); 2330 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2331 rtnl_unlock(); 2332 } 2333 2334 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2335 { 2336 struct net_device *dev = ptr; 2337 2338 switch (event) { 2339 case NETDEV_UP: 2340 case NETDEV_DOWN: 2341 case NETDEV_PRE_UP: 2342 case NETDEV_POST_INIT: 2343 case NETDEV_REGISTER: 2344 case NETDEV_CHANGE: 2345 case NETDEV_PRE_TYPE_CHANGE: 2346 case NETDEV_GOING_DOWN: 2347 case NETDEV_UNREGISTER: 2348 case NETDEV_UNREGISTER_BATCH: 2349 case NETDEV_RELEASE: 2350 case NETDEV_JOIN: 2351 break; 2352 default: 2353 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2354 break; 2355 } 2356 return NOTIFY_DONE; 2357 } 2358 2359 static struct notifier_block rtnetlink_dev_notifier = { 2360 .notifier_call = rtnetlink_event, 2361 }; 2362 2363 2364 static int __net_init rtnetlink_net_init(struct net *net) 2365 { 2366 struct sock *sk; 2367 struct netlink_kernel_cfg cfg = { 2368 .groups = RTNLGRP_MAX, 2369 .input = rtnetlink_rcv, 2370 .cb_mutex = &rtnl_mutex, 2371 }; 2372 2373 sk = netlink_kernel_create(net, NETLINK_ROUTE, THIS_MODULE, &cfg); 2374 if (!sk) 2375 return -ENOMEM; 2376 net->rtnl = sk; 2377 return 0; 2378 } 2379 2380 static void __net_exit rtnetlink_net_exit(struct net *net) 2381 { 2382 netlink_kernel_release(net->rtnl); 2383 net->rtnl = NULL; 2384 } 2385 2386 static struct pernet_operations rtnetlink_net_ops = { 2387 .init = rtnetlink_net_init, 2388 .exit = rtnetlink_net_exit, 2389 }; 2390 2391 void __init rtnetlink_init(void) 2392 { 2393 int i; 2394 2395 rtattr_max = 0; 2396 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 2397 if (rta_max[i] > rtattr_max) 2398 rtattr_max = rta_max[i]; 2399 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 2400 if (!rta_buf) 2401 panic("rtnetlink_init: cannot allocate rta_buf\n"); 2402 2403 if (register_pernet_subsys(&rtnetlink_net_ops)) 2404 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2405 2406 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 2407 register_netdevice_notifier(&rtnetlink_dev_notifier); 2408 2409 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2410 rtnl_dump_ifinfo, rtnl_calcit); 2411 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2412 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2413 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2414 2415 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2416 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2417 2418 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 2419 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 2420 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 2421 } 2422 2423