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