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/pci.h> 39 40 #include <asm/uaccess.h> 41 #include <asm/system.h> 42 43 #include <linux/inet.h> 44 #include <linux/netdevice.h> 45 #include <net/ip.h> 46 #include <net/protocol.h> 47 #include <net/arp.h> 48 #include <net/route.h> 49 #include <net/udp.h> 50 #include <net/sock.h> 51 #include <net/pkt_sched.h> 52 #include <net/fib_rules.h> 53 #include <net/rtnetlink.h> 54 #include <net/net_namespace.h> 55 56 struct rtnl_link { 57 rtnl_doit_func doit; 58 rtnl_dumpit_func dumpit; 59 rtnl_calcit_func calcit; 60 }; 61 62 static DEFINE_MUTEX(rtnl_mutex); 63 64 void rtnl_lock(void) 65 { 66 mutex_lock(&rtnl_mutex); 67 } 68 EXPORT_SYMBOL(rtnl_lock); 69 70 void __rtnl_unlock(void) 71 { 72 mutex_unlock(&rtnl_mutex); 73 } 74 75 void rtnl_unlock(void) 76 { 77 /* This fellow will unlock it for us. */ 78 netdev_run_todo(); 79 } 80 EXPORT_SYMBOL(rtnl_unlock); 81 82 int rtnl_trylock(void) 83 { 84 return mutex_trylock(&rtnl_mutex); 85 } 86 EXPORT_SYMBOL(rtnl_trylock); 87 88 int rtnl_is_locked(void) 89 { 90 return mutex_is_locked(&rtnl_mutex); 91 } 92 EXPORT_SYMBOL(rtnl_is_locked); 93 94 #ifdef CONFIG_PROVE_LOCKING 95 int lockdep_rtnl_is_held(void) 96 { 97 return lockdep_is_held(&rtnl_mutex); 98 } 99 EXPORT_SYMBOL(lockdep_rtnl_is_held); 100 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 101 102 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 103 104 static inline int rtm_msgindex(int msgtype) 105 { 106 int msgindex = msgtype - RTM_BASE; 107 108 /* 109 * msgindex < 0 implies someone tried to register a netlink 110 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 111 * the message type has not been added to linux/rtnetlink.h 112 */ 113 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 114 115 return msgindex; 116 } 117 118 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 119 { 120 struct rtnl_link *tab; 121 122 if (protocol <= RTNL_FAMILY_MAX) 123 tab = rtnl_msg_handlers[protocol]; 124 else 125 tab = NULL; 126 127 if (tab == NULL || tab[msgindex].doit == NULL) 128 tab = rtnl_msg_handlers[PF_UNSPEC]; 129 130 return tab ? tab[msgindex].doit : NULL; 131 } 132 133 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 134 { 135 struct rtnl_link *tab; 136 137 if (protocol <= RTNL_FAMILY_MAX) 138 tab = rtnl_msg_handlers[protocol]; 139 else 140 tab = NULL; 141 142 if (tab == NULL || tab[msgindex].dumpit == NULL) 143 tab = rtnl_msg_handlers[PF_UNSPEC]; 144 145 return tab ? tab[msgindex].dumpit : NULL; 146 } 147 148 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 149 { 150 struct rtnl_link *tab; 151 152 if (protocol <= RTNL_FAMILY_MAX) 153 tab = rtnl_msg_handlers[protocol]; 154 else 155 tab = NULL; 156 157 if (tab == NULL || tab[msgindex].calcit == NULL) 158 tab = rtnl_msg_handlers[PF_UNSPEC]; 159 160 return tab ? tab[msgindex].calcit : NULL; 161 } 162 163 /** 164 * __rtnl_register - Register a rtnetlink message type 165 * @protocol: Protocol family or PF_UNSPEC 166 * @msgtype: rtnetlink message type 167 * @doit: Function pointer called for each request message 168 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 169 * @calcit: Function pointer to calc size of dump message 170 * 171 * Registers the specified function pointers (at least one of them has 172 * to be non-NULL) to be called whenever a request message for the 173 * specified protocol family and message type is received. 174 * 175 * The special protocol family PF_UNSPEC may be used to define fallback 176 * function pointers for the case when no entry for the specific protocol 177 * family exists. 178 * 179 * Returns 0 on success or a negative error code. 180 */ 181 int __rtnl_register(int protocol, int msgtype, 182 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 183 rtnl_calcit_func calcit) 184 { 185 struct rtnl_link *tab; 186 int msgindex; 187 188 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 189 msgindex = rtm_msgindex(msgtype); 190 191 tab = rtnl_msg_handlers[protocol]; 192 if (tab == NULL) { 193 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 194 if (tab == NULL) 195 return -ENOBUFS; 196 197 rtnl_msg_handlers[protocol] = tab; 198 } 199 200 if (doit) 201 tab[msgindex].doit = doit; 202 203 if (dumpit) 204 tab[msgindex].dumpit = dumpit; 205 206 if (calcit) 207 tab[msgindex].calcit = calcit; 208 209 return 0; 210 } 211 EXPORT_SYMBOL_GPL(__rtnl_register); 212 213 /** 214 * rtnl_register - Register a rtnetlink message type 215 * 216 * Identical to __rtnl_register() but panics on failure. This is useful 217 * as failure of this function is very unlikely, it can only happen due 218 * to lack of memory when allocating the chain to store all message 219 * handlers for a protocol. Meant for use in init functions where lack 220 * of memory implies no sense in continuing. 221 */ 222 void rtnl_register(int protocol, int msgtype, 223 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 224 rtnl_calcit_func calcit) 225 { 226 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 227 panic("Unable to register rtnetlink message handler, " 228 "protocol = %d, message type = %d\n", 229 protocol, msgtype); 230 } 231 EXPORT_SYMBOL_GPL(rtnl_register); 232 233 /** 234 * rtnl_unregister - Unregister a rtnetlink message type 235 * @protocol: Protocol family or PF_UNSPEC 236 * @msgtype: rtnetlink message type 237 * 238 * Returns 0 on success or a negative error code. 239 */ 240 int rtnl_unregister(int protocol, int msgtype) 241 { 242 int msgindex; 243 244 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 245 msgindex = rtm_msgindex(msgtype); 246 247 if (rtnl_msg_handlers[protocol] == NULL) 248 return -ENOENT; 249 250 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 251 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 252 253 return 0; 254 } 255 EXPORT_SYMBOL_GPL(rtnl_unregister); 256 257 /** 258 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 259 * @protocol : Protocol family or PF_UNSPEC 260 * 261 * Identical to calling rtnl_unregster() for all registered message types 262 * of a certain protocol family. 263 */ 264 void rtnl_unregister_all(int protocol) 265 { 266 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 267 268 kfree(rtnl_msg_handlers[protocol]); 269 rtnl_msg_handlers[protocol] = NULL; 270 } 271 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 272 273 static LIST_HEAD(link_ops); 274 275 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 276 { 277 const struct rtnl_link_ops *ops; 278 279 list_for_each_entry(ops, &link_ops, list) { 280 if (!strcmp(ops->kind, kind)) 281 return ops; 282 } 283 return NULL; 284 } 285 286 /** 287 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 288 * @ops: struct rtnl_link_ops * to register 289 * 290 * The caller must hold the rtnl_mutex. This function should be used 291 * by drivers that create devices during module initialization. It 292 * must be called before registering the devices. 293 * 294 * Returns 0 on success or a negative error code. 295 */ 296 int __rtnl_link_register(struct rtnl_link_ops *ops) 297 { 298 if (rtnl_link_ops_get(ops->kind)) 299 return -EEXIST; 300 301 if (!ops->dellink) 302 ops->dellink = unregister_netdevice_queue; 303 304 list_add_tail(&ops->list, &link_ops); 305 return 0; 306 } 307 EXPORT_SYMBOL_GPL(__rtnl_link_register); 308 309 /** 310 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 311 * @ops: struct rtnl_link_ops * to register 312 * 313 * Returns 0 on success or a negative error code. 314 */ 315 int rtnl_link_register(struct rtnl_link_ops *ops) 316 { 317 int err; 318 319 rtnl_lock(); 320 err = __rtnl_link_register(ops); 321 rtnl_unlock(); 322 return err; 323 } 324 EXPORT_SYMBOL_GPL(rtnl_link_register); 325 326 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 327 { 328 struct net_device *dev; 329 LIST_HEAD(list_kill); 330 331 for_each_netdev(net, dev) { 332 if (dev->rtnl_link_ops == ops) 333 ops->dellink(dev, &list_kill); 334 } 335 unregister_netdevice_many(&list_kill); 336 } 337 338 /** 339 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 340 * @ops: struct rtnl_link_ops * to unregister 341 * 342 * The caller must hold the rtnl_mutex. 343 */ 344 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 345 { 346 struct net *net; 347 348 for_each_net(net) { 349 __rtnl_kill_links(net, ops); 350 } 351 list_del(&ops->list); 352 } 353 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 354 355 /** 356 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 357 * @ops: struct rtnl_link_ops * to unregister 358 */ 359 void rtnl_link_unregister(struct rtnl_link_ops *ops) 360 { 361 rtnl_lock(); 362 __rtnl_link_unregister(ops); 363 rtnl_unlock(); 364 } 365 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 366 367 static size_t rtnl_link_get_size(const struct net_device *dev) 368 { 369 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 370 size_t size; 371 372 if (!ops) 373 return 0; 374 375 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 376 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 377 378 if (ops->get_size) 379 /* IFLA_INFO_DATA + nested data */ 380 size += nla_total_size(sizeof(struct nlattr)) + 381 ops->get_size(dev); 382 383 if (ops->get_xstats_size) 384 /* IFLA_INFO_XSTATS */ 385 size += nla_total_size(ops->get_xstats_size(dev)); 386 387 return size; 388 } 389 390 static LIST_HEAD(rtnl_af_ops); 391 392 static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 393 { 394 const struct rtnl_af_ops *ops; 395 396 list_for_each_entry(ops, &rtnl_af_ops, list) { 397 if (ops->family == family) 398 return ops; 399 } 400 401 return NULL; 402 } 403 404 /** 405 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink. 406 * @ops: struct rtnl_af_ops * to register 407 * 408 * The caller must hold the rtnl_mutex. 409 * 410 * Returns 0 on success or a negative error code. 411 */ 412 int __rtnl_af_register(struct rtnl_af_ops *ops) 413 { 414 list_add_tail(&ops->list, &rtnl_af_ops); 415 return 0; 416 } 417 EXPORT_SYMBOL_GPL(__rtnl_af_register); 418 419 /** 420 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 421 * @ops: struct rtnl_af_ops * to register 422 * 423 * Returns 0 on success or a negative error code. 424 */ 425 int rtnl_af_register(struct rtnl_af_ops *ops) 426 { 427 int err; 428 429 rtnl_lock(); 430 err = __rtnl_af_register(ops); 431 rtnl_unlock(); 432 return err; 433 } 434 EXPORT_SYMBOL_GPL(rtnl_af_register); 435 436 /** 437 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 438 * @ops: struct rtnl_af_ops * to unregister 439 * 440 * The caller must hold the rtnl_mutex. 441 */ 442 void __rtnl_af_unregister(struct rtnl_af_ops *ops) 443 { 444 list_del(&ops->list); 445 } 446 EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 447 448 /** 449 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 450 * @ops: struct rtnl_af_ops * to unregister 451 */ 452 void rtnl_af_unregister(struct rtnl_af_ops *ops) 453 { 454 rtnl_lock(); 455 __rtnl_af_unregister(ops); 456 rtnl_unlock(); 457 } 458 EXPORT_SYMBOL_GPL(rtnl_af_unregister); 459 460 static size_t rtnl_link_get_af_size(const struct net_device *dev) 461 { 462 struct rtnl_af_ops *af_ops; 463 size_t size; 464 465 /* IFLA_AF_SPEC */ 466 size = nla_total_size(sizeof(struct nlattr)); 467 468 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 469 if (af_ops->get_link_af_size) { 470 /* AF_* + nested data */ 471 size += nla_total_size(sizeof(struct nlattr)) + 472 af_ops->get_link_af_size(dev); 473 } 474 } 475 476 return size; 477 } 478 479 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 480 { 481 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 482 struct nlattr *linkinfo, *data; 483 int err = -EMSGSIZE; 484 485 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 486 if (linkinfo == NULL) 487 goto out; 488 489 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 490 goto err_cancel_link; 491 if (ops->fill_xstats) { 492 err = ops->fill_xstats(skb, dev); 493 if (err < 0) 494 goto err_cancel_link; 495 } 496 if (ops->fill_info) { 497 data = nla_nest_start(skb, IFLA_INFO_DATA); 498 if (data == NULL) 499 goto err_cancel_link; 500 err = ops->fill_info(skb, dev); 501 if (err < 0) 502 goto err_cancel_data; 503 nla_nest_end(skb, data); 504 } 505 506 nla_nest_end(skb, linkinfo); 507 return 0; 508 509 err_cancel_data: 510 nla_nest_cancel(skb, data); 511 err_cancel_link: 512 nla_nest_cancel(skb, linkinfo); 513 out: 514 return err; 515 } 516 517 static const int rtm_min[RTM_NR_FAMILIES] = 518 { 519 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 520 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 521 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 522 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 523 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 524 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 525 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 526 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 527 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 528 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 529 }; 530 531 static const int rta_max[RTM_NR_FAMILIES] = 532 { 533 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 534 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 535 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 536 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 537 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 538 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 539 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 540 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 541 }; 542 543 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 544 { 545 struct rtattr *rta; 546 int size = RTA_LENGTH(attrlen); 547 548 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); 549 rta->rta_type = attrtype; 550 rta->rta_len = size; 551 memcpy(RTA_DATA(rta), data, attrlen); 552 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 553 } 554 EXPORT_SYMBOL(__rta_fill); 555 556 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 557 { 558 struct sock *rtnl = net->rtnl; 559 int err = 0; 560 561 NETLINK_CB(skb).dst_group = group; 562 if (echo) 563 atomic_inc(&skb->users); 564 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 565 if (echo) 566 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 567 return err; 568 } 569 570 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 571 { 572 struct sock *rtnl = net->rtnl; 573 574 return nlmsg_unicast(rtnl, skb, pid); 575 } 576 EXPORT_SYMBOL(rtnl_unicast); 577 578 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 579 struct nlmsghdr *nlh, gfp_t flags) 580 { 581 struct sock *rtnl = net->rtnl; 582 int report = 0; 583 584 if (nlh) 585 report = nlmsg_report(nlh); 586 587 nlmsg_notify(rtnl, skb, pid, group, report, flags); 588 } 589 EXPORT_SYMBOL(rtnl_notify); 590 591 void rtnl_set_sk_err(struct net *net, u32 group, int error) 592 { 593 struct sock *rtnl = net->rtnl; 594 595 netlink_set_err(rtnl, 0, group, error); 596 } 597 EXPORT_SYMBOL(rtnl_set_sk_err); 598 599 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 600 { 601 struct nlattr *mx; 602 int i, valid = 0; 603 604 mx = nla_nest_start(skb, RTA_METRICS); 605 if (mx == NULL) 606 return -ENOBUFS; 607 608 for (i = 0; i < RTAX_MAX; i++) { 609 if (metrics[i]) { 610 valid++; 611 NLA_PUT_U32(skb, i+1, metrics[i]); 612 } 613 } 614 615 if (!valid) { 616 nla_nest_cancel(skb, mx); 617 return 0; 618 } 619 620 return nla_nest_end(skb, mx); 621 622 nla_put_failure: 623 nla_nest_cancel(skb, mx); 624 return -EMSGSIZE; 625 } 626 EXPORT_SYMBOL(rtnetlink_put_metrics); 627 628 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 629 u32 ts, u32 tsage, long expires, u32 error) 630 { 631 struct rta_cacheinfo ci = { 632 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 633 .rta_used = dst->__use, 634 .rta_clntref = atomic_read(&(dst->__refcnt)), 635 .rta_error = error, 636 .rta_id = id, 637 .rta_ts = ts, 638 .rta_tsage = tsage, 639 }; 640 641 if (expires) 642 ci.rta_expires = jiffies_to_clock_t(expires); 643 644 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 645 } 646 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 647 648 static void set_operstate(struct net_device *dev, unsigned char transition) 649 { 650 unsigned char operstate = dev->operstate; 651 652 switch (transition) { 653 case IF_OPER_UP: 654 if ((operstate == IF_OPER_DORMANT || 655 operstate == IF_OPER_UNKNOWN) && 656 !netif_dormant(dev)) 657 operstate = IF_OPER_UP; 658 break; 659 660 case IF_OPER_DORMANT: 661 if (operstate == IF_OPER_UP || 662 operstate == IF_OPER_UNKNOWN) 663 operstate = IF_OPER_DORMANT; 664 break; 665 } 666 667 if (dev->operstate != operstate) { 668 write_lock_bh(&dev_base_lock); 669 dev->operstate = operstate; 670 write_unlock_bh(&dev_base_lock); 671 netdev_state_change(dev); 672 } 673 } 674 675 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 676 const struct ifinfomsg *ifm) 677 { 678 unsigned int flags = ifm->ifi_flags; 679 680 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 681 if (ifm->ifi_change) 682 flags = (flags & ifm->ifi_change) | 683 (dev->flags & ~ifm->ifi_change); 684 685 return flags; 686 } 687 688 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 689 const struct rtnl_link_stats64 *b) 690 { 691 a->rx_packets = b->rx_packets; 692 a->tx_packets = b->tx_packets; 693 a->rx_bytes = b->rx_bytes; 694 a->tx_bytes = b->tx_bytes; 695 a->rx_errors = b->rx_errors; 696 a->tx_errors = b->tx_errors; 697 a->rx_dropped = b->rx_dropped; 698 a->tx_dropped = b->tx_dropped; 699 700 a->multicast = b->multicast; 701 a->collisions = b->collisions; 702 703 a->rx_length_errors = b->rx_length_errors; 704 a->rx_over_errors = b->rx_over_errors; 705 a->rx_crc_errors = b->rx_crc_errors; 706 a->rx_frame_errors = b->rx_frame_errors; 707 a->rx_fifo_errors = b->rx_fifo_errors; 708 a->rx_missed_errors = b->rx_missed_errors; 709 710 a->tx_aborted_errors = b->tx_aborted_errors; 711 a->tx_carrier_errors = b->tx_carrier_errors; 712 a->tx_fifo_errors = b->tx_fifo_errors; 713 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 714 a->tx_window_errors = b->tx_window_errors; 715 716 a->rx_compressed = b->rx_compressed; 717 a->tx_compressed = b->tx_compressed; 718 } 719 720 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 721 { 722 memcpy(v, b, sizeof(*b)); 723 } 724 725 /* All VF info */ 726 static inline int rtnl_vfinfo_size(const struct net_device *dev, 727 u32 ext_filter_mask) 728 { 729 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 730 (ext_filter_mask & RTEXT_FILTER_VF)) { 731 int num_vfs = dev_num_vf(dev->dev.parent); 732 size_t size = nla_total_size(sizeof(struct nlattr)); 733 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 734 size += num_vfs * 735 (nla_total_size(sizeof(struct ifla_vf_mac)) + 736 nla_total_size(sizeof(struct ifla_vf_vlan)) + 737 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 738 nla_total_size(sizeof(struct ifla_vf_spoofchk))); 739 return size; 740 } else 741 return 0; 742 } 743 744 static size_t rtnl_port_size(const struct net_device *dev) 745 { 746 size_t port_size = nla_total_size(4) /* PORT_VF */ 747 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 748 + nla_total_size(sizeof(struct ifla_port_vsi)) 749 /* PORT_VSI_TYPE */ 750 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 751 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 752 + nla_total_size(1) /* PROT_VDP_REQUEST */ 753 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 754 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 755 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 756 + port_size; 757 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 758 + port_size; 759 760 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 761 return 0; 762 if (dev_num_vf(dev->dev.parent)) 763 return port_self_size + vf_ports_size + 764 vf_port_size * dev_num_vf(dev->dev.parent); 765 else 766 return port_self_size; 767 } 768 769 static noinline size_t if_nlmsg_size(const struct net_device *dev, 770 u32 ext_filter_mask) 771 { 772 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 773 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 774 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 775 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 776 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 777 + nla_total_size(sizeof(struct rtnl_link_stats)) 778 + nla_total_size(sizeof(struct rtnl_link_stats64)) 779 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 780 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 781 + nla_total_size(4) /* IFLA_TXQLEN */ 782 + nla_total_size(4) /* IFLA_WEIGHT */ 783 + nla_total_size(4) /* IFLA_MTU */ 784 + nla_total_size(4) /* IFLA_LINK */ 785 + nla_total_size(4) /* IFLA_MASTER */ 786 + nla_total_size(1) /* IFLA_OPERSTATE */ 787 + nla_total_size(1) /* IFLA_LINKMODE */ 788 + nla_total_size(ext_filter_mask 789 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 790 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 791 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 792 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 793 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 794 } 795 796 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 797 { 798 struct nlattr *vf_ports; 799 struct nlattr *vf_port; 800 int vf; 801 int err; 802 803 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 804 if (!vf_ports) 805 return -EMSGSIZE; 806 807 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 808 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 809 if (!vf_port) 810 goto nla_put_failure; 811 NLA_PUT_U32(skb, IFLA_PORT_VF, vf); 812 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 813 if (err == -EMSGSIZE) 814 goto nla_put_failure; 815 if (err) { 816 nla_nest_cancel(skb, vf_port); 817 continue; 818 } 819 nla_nest_end(skb, vf_port); 820 } 821 822 nla_nest_end(skb, vf_ports); 823 824 return 0; 825 826 nla_put_failure: 827 nla_nest_cancel(skb, vf_ports); 828 return -EMSGSIZE; 829 } 830 831 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 832 { 833 struct nlattr *port_self; 834 int err; 835 836 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 837 if (!port_self) 838 return -EMSGSIZE; 839 840 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 841 if (err) { 842 nla_nest_cancel(skb, port_self); 843 return (err == -EMSGSIZE) ? err : 0; 844 } 845 846 nla_nest_end(skb, port_self); 847 848 return 0; 849 } 850 851 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 852 { 853 int err; 854 855 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 856 return 0; 857 858 err = rtnl_port_self_fill(skb, dev); 859 if (err) 860 return err; 861 862 if (dev_num_vf(dev->dev.parent)) { 863 err = rtnl_vf_ports_fill(skb, dev); 864 if (err) 865 return err; 866 } 867 868 return 0; 869 } 870 871 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 872 int type, u32 pid, u32 seq, u32 change, 873 unsigned int flags, u32 ext_filter_mask) 874 { 875 struct ifinfomsg *ifm; 876 struct nlmsghdr *nlh; 877 struct rtnl_link_stats64 temp; 878 const struct rtnl_link_stats64 *stats; 879 struct nlattr *attr, *af_spec; 880 struct rtnl_af_ops *af_ops; 881 882 ASSERT_RTNL(); 883 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 884 if (nlh == NULL) 885 return -EMSGSIZE; 886 887 ifm = nlmsg_data(nlh); 888 ifm->ifi_family = AF_UNSPEC; 889 ifm->__ifi_pad = 0; 890 ifm->ifi_type = dev->type; 891 ifm->ifi_index = dev->ifindex; 892 ifm->ifi_flags = dev_get_flags(dev); 893 ifm->ifi_change = change; 894 895 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 896 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 897 NLA_PUT_U8(skb, IFLA_OPERSTATE, 898 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 899 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 900 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 901 NLA_PUT_U32(skb, IFLA_GROUP, dev->group); 902 903 if (dev->ifindex != dev->iflink) 904 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 905 906 if (dev->master) 907 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 908 909 if (dev->qdisc) 910 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 911 912 if (dev->ifalias) 913 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 914 915 if (1) { 916 struct rtnl_link_ifmap map = { 917 .mem_start = dev->mem_start, 918 .mem_end = dev->mem_end, 919 .base_addr = dev->base_addr, 920 .irq = dev->irq, 921 .dma = dev->dma, 922 .port = dev->if_port, 923 }; 924 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 925 } 926 927 if (dev->addr_len) { 928 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 929 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 930 } 931 932 attr = nla_reserve(skb, IFLA_STATS, 933 sizeof(struct rtnl_link_stats)); 934 if (attr == NULL) 935 goto nla_put_failure; 936 937 stats = dev_get_stats(dev, &temp); 938 copy_rtnl_link_stats(nla_data(attr), stats); 939 940 attr = nla_reserve(skb, IFLA_STATS64, 941 sizeof(struct rtnl_link_stats64)); 942 if (attr == NULL) 943 goto nla_put_failure; 944 copy_rtnl_link_stats64(nla_data(attr), stats); 945 946 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) 947 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); 948 949 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 950 && (ext_filter_mask & RTEXT_FILTER_VF)) { 951 int i; 952 953 struct nlattr *vfinfo, *vf; 954 int num_vfs = dev_num_vf(dev->dev.parent); 955 956 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 957 if (!vfinfo) 958 goto nla_put_failure; 959 for (i = 0; i < num_vfs; i++) { 960 struct ifla_vf_info ivi; 961 struct ifla_vf_mac vf_mac; 962 struct ifla_vf_vlan vf_vlan; 963 struct ifla_vf_tx_rate vf_tx_rate; 964 struct ifla_vf_spoofchk vf_spoofchk; 965 966 /* 967 * Not all SR-IOV capable drivers support the 968 * spoofcheck query. Preset to -1 so the user 969 * space tool can detect that the driver didn't 970 * report anything. 971 */ 972 ivi.spoofchk = -1; 973 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 974 break; 975 vf_mac.vf = 976 vf_vlan.vf = 977 vf_tx_rate.vf = 978 vf_spoofchk.vf = ivi.vf; 979 980 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 981 vf_vlan.vlan = ivi.vlan; 982 vf_vlan.qos = ivi.qos; 983 vf_tx_rate.rate = ivi.tx_rate; 984 vf_spoofchk.setting = ivi.spoofchk; 985 vf = nla_nest_start(skb, IFLA_VF_INFO); 986 if (!vf) { 987 nla_nest_cancel(skb, vfinfo); 988 goto nla_put_failure; 989 } 990 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac); 991 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan); 992 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 993 &vf_tx_rate); 994 NLA_PUT(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 995 &vf_spoofchk); 996 nla_nest_end(skb, vf); 997 } 998 nla_nest_end(skb, vfinfo); 999 } 1000 1001 if (rtnl_port_fill(skb, dev)) 1002 goto nla_put_failure; 1003 1004 if (dev->rtnl_link_ops) { 1005 if (rtnl_link_fill(skb, dev) < 0) 1006 goto nla_put_failure; 1007 } 1008 1009 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1010 goto nla_put_failure; 1011 1012 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1013 if (af_ops->fill_link_af) { 1014 struct nlattr *af; 1015 int err; 1016 1017 if (!(af = nla_nest_start(skb, af_ops->family))) 1018 goto nla_put_failure; 1019 1020 err = af_ops->fill_link_af(skb, dev); 1021 1022 /* 1023 * Caller may return ENODATA to indicate that there 1024 * was no data to be dumped. This is not an error, it 1025 * means we should trim the attribute header and 1026 * continue. 1027 */ 1028 if (err == -ENODATA) 1029 nla_nest_cancel(skb, af); 1030 else if (err < 0) 1031 goto nla_put_failure; 1032 1033 nla_nest_end(skb, af); 1034 } 1035 } 1036 1037 nla_nest_end(skb, af_spec); 1038 1039 return nlmsg_end(skb, nlh); 1040 1041 nla_put_failure: 1042 nlmsg_cancel(skb, nlh); 1043 return -EMSGSIZE; 1044 } 1045 1046 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1047 { 1048 struct net *net = sock_net(skb->sk); 1049 int h, s_h; 1050 int idx = 0, s_idx; 1051 struct net_device *dev; 1052 struct hlist_head *head; 1053 struct hlist_node *node; 1054 struct nlattr *tb[IFLA_MAX+1]; 1055 u32 ext_filter_mask = 0; 1056 1057 s_h = cb->args[0]; 1058 s_idx = cb->args[1]; 1059 1060 rcu_read_lock(); 1061 cb->seq = net->dev_base_seq; 1062 1063 nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1064 ifla_policy); 1065 1066 if (tb[IFLA_EXT_MASK]) 1067 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1068 1069 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1070 idx = 0; 1071 head = &net->dev_index_head[h]; 1072 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 1073 if (idx < s_idx) 1074 goto cont; 1075 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1076 NETLINK_CB(cb->skb).pid, 1077 cb->nlh->nlmsg_seq, 0, 1078 NLM_F_MULTI, 1079 ext_filter_mask) <= 0) 1080 goto out; 1081 1082 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1083 cont: 1084 idx++; 1085 } 1086 } 1087 out: 1088 rcu_read_unlock(); 1089 cb->args[1] = idx; 1090 cb->args[0] = h; 1091 1092 return skb->len; 1093 } 1094 1095 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1096 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1097 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1098 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1099 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1100 [IFLA_MTU] = { .type = NLA_U32 }, 1101 [IFLA_LINK] = { .type = NLA_U32 }, 1102 [IFLA_MASTER] = { .type = NLA_U32 }, 1103 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1104 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1105 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1106 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1107 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1108 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1109 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1110 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1111 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1112 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1113 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1114 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1115 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1116 }; 1117 EXPORT_SYMBOL(ifla_policy); 1118 1119 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1120 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1121 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1122 }; 1123 1124 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1125 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1126 }; 1127 1128 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1129 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1130 .len = sizeof(struct ifla_vf_mac) }, 1131 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1132 .len = sizeof(struct ifla_vf_vlan) }, 1133 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1134 .len = sizeof(struct ifla_vf_tx_rate) }, 1135 }; 1136 1137 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1138 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1139 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1140 .len = PORT_PROFILE_MAX }, 1141 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1142 .len = sizeof(struct ifla_port_vsi)}, 1143 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1144 .len = PORT_UUID_MAX }, 1145 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1146 .len = PORT_UUID_MAX }, 1147 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1148 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1149 }; 1150 1151 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1152 { 1153 struct net *net; 1154 /* Examine the link attributes and figure out which 1155 * network namespace we are talking about. 1156 */ 1157 if (tb[IFLA_NET_NS_PID]) 1158 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1159 else if (tb[IFLA_NET_NS_FD]) 1160 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1161 else 1162 net = get_net(src_net); 1163 return net; 1164 } 1165 EXPORT_SYMBOL(rtnl_link_get_net); 1166 1167 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1168 { 1169 if (dev) { 1170 if (tb[IFLA_ADDRESS] && 1171 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1172 return -EINVAL; 1173 1174 if (tb[IFLA_BROADCAST] && 1175 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1176 return -EINVAL; 1177 } 1178 1179 if (tb[IFLA_AF_SPEC]) { 1180 struct nlattr *af; 1181 int rem, err; 1182 1183 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1184 const struct rtnl_af_ops *af_ops; 1185 1186 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1187 return -EAFNOSUPPORT; 1188 1189 if (!af_ops->set_link_af) 1190 return -EOPNOTSUPP; 1191 1192 if (af_ops->validate_link_af) { 1193 err = af_ops->validate_link_af(dev, af); 1194 if (err < 0) 1195 return err; 1196 } 1197 } 1198 } 1199 1200 return 0; 1201 } 1202 1203 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1204 { 1205 int rem, err = -EINVAL; 1206 struct nlattr *vf; 1207 const struct net_device_ops *ops = dev->netdev_ops; 1208 1209 nla_for_each_nested(vf, attr, rem) { 1210 switch (nla_type(vf)) { 1211 case IFLA_VF_MAC: { 1212 struct ifla_vf_mac *ivm; 1213 ivm = nla_data(vf); 1214 err = -EOPNOTSUPP; 1215 if (ops->ndo_set_vf_mac) 1216 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1217 ivm->mac); 1218 break; 1219 } 1220 case IFLA_VF_VLAN: { 1221 struct ifla_vf_vlan *ivv; 1222 ivv = nla_data(vf); 1223 err = -EOPNOTSUPP; 1224 if (ops->ndo_set_vf_vlan) 1225 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1226 ivv->vlan, 1227 ivv->qos); 1228 break; 1229 } 1230 case IFLA_VF_TX_RATE: { 1231 struct ifla_vf_tx_rate *ivt; 1232 ivt = nla_data(vf); 1233 err = -EOPNOTSUPP; 1234 if (ops->ndo_set_vf_tx_rate) 1235 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1236 ivt->rate); 1237 break; 1238 } 1239 case IFLA_VF_SPOOFCHK: { 1240 struct ifla_vf_spoofchk *ivs; 1241 ivs = nla_data(vf); 1242 err = -EOPNOTSUPP; 1243 if (ops->ndo_set_vf_spoofchk) 1244 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1245 ivs->setting); 1246 break; 1247 } 1248 default: 1249 err = -EINVAL; 1250 break; 1251 } 1252 if (err) 1253 break; 1254 } 1255 return err; 1256 } 1257 1258 static int do_set_master(struct net_device *dev, int ifindex) 1259 { 1260 struct net_device *master_dev; 1261 const struct net_device_ops *ops; 1262 int err; 1263 1264 if (dev->master) { 1265 if (dev->master->ifindex == ifindex) 1266 return 0; 1267 ops = dev->master->netdev_ops; 1268 if (ops->ndo_del_slave) { 1269 err = ops->ndo_del_slave(dev->master, dev); 1270 if (err) 1271 return err; 1272 } else { 1273 return -EOPNOTSUPP; 1274 } 1275 } 1276 1277 if (ifindex) { 1278 master_dev = __dev_get_by_index(dev_net(dev), ifindex); 1279 if (!master_dev) 1280 return -EINVAL; 1281 ops = master_dev->netdev_ops; 1282 if (ops->ndo_add_slave) { 1283 err = ops->ndo_add_slave(master_dev, dev); 1284 if (err) 1285 return err; 1286 } else { 1287 return -EOPNOTSUPP; 1288 } 1289 } 1290 return 0; 1291 } 1292 1293 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1294 struct nlattr **tb, char *ifname, int modified) 1295 { 1296 const struct net_device_ops *ops = dev->netdev_ops; 1297 int send_addr_notify = 0; 1298 int err; 1299 1300 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1301 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1302 if (IS_ERR(net)) { 1303 err = PTR_ERR(net); 1304 goto errout; 1305 } 1306 err = dev_change_net_namespace(dev, net, ifname); 1307 put_net(net); 1308 if (err) 1309 goto errout; 1310 modified = 1; 1311 } 1312 1313 if (tb[IFLA_MAP]) { 1314 struct rtnl_link_ifmap *u_map; 1315 struct ifmap k_map; 1316 1317 if (!ops->ndo_set_config) { 1318 err = -EOPNOTSUPP; 1319 goto errout; 1320 } 1321 1322 if (!netif_device_present(dev)) { 1323 err = -ENODEV; 1324 goto errout; 1325 } 1326 1327 u_map = nla_data(tb[IFLA_MAP]); 1328 k_map.mem_start = (unsigned long) u_map->mem_start; 1329 k_map.mem_end = (unsigned long) u_map->mem_end; 1330 k_map.base_addr = (unsigned short) u_map->base_addr; 1331 k_map.irq = (unsigned char) u_map->irq; 1332 k_map.dma = (unsigned char) u_map->dma; 1333 k_map.port = (unsigned char) u_map->port; 1334 1335 err = ops->ndo_set_config(dev, &k_map); 1336 if (err < 0) 1337 goto errout; 1338 1339 modified = 1; 1340 } 1341 1342 if (tb[IFLA_ADDRESS]) { 1343 struct sockaddr *sa; 1344 int len; 1345 1346 if (!ops->ndo_set_mac_address) { 1347 err = -EOPNOTSUPP; 1348 goto errout; 1349 } 1350 1351 if (!netif_device_present(dev)) { 1352 err = -ENODEV; 1353 goto errout; 1354 } 1355 1356 len = sizeof(sa_family_t) + dev->addr_len; 1357 sa = kmalloc(len, GFP_KERNEL); 1358 if (!sa) { 1359 err = -ENOMEM; 1360 goto errout; 1361 } 1362 sa->sa_family = dev->type; 1363 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1364 dev->addr_len); 1365 err = ops->ndo_set_mac_address(dev, sa); 1366 kfree(sa); 1367 if (err) 1368 goto errout; 1369 send_addr_notify = 1; 1370 modified = 1; 1371 } 1372 1373 if (tb[IFLA_MTU]) { 1374 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1375 if (err < 0) 1376 goto errout; 1377 modified = 1; 1378 } 1379 1380 if (tb[IFLA_GROUP]) { 1381 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1382 modified = 1; 1383 } 1384 1385 /* 1386 * Interface selected by interface index but interface 1387 * name provided implies that a name change has been 1388 * requested. 1389 */ 1390 if (ifm->ifi_index > 0 && ifname[0]) { 1391 err = dev_change_name(dev, ifname); 1392 if (err < 0) 1393 goto errout; 1394 modified = 1; 1395 } 1396 1397 if (tb[IFLA_IFALIAS]) { 1398 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1399 nla_len(tb[IFLA_IFALIAS])); 1400 if (err < 0) 1401 goto errout; 1402 modified = 1; 1403 } 1404 1405 if (tb[IFLA_BROADCAST]) { 1406 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1407 send_addr_notify = 1; 1408 } 1409 1410 if (ifm->ifi_flags || ifm->ifi_change) { 1411 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1412 if (err < 0) 1413 goto errout; 1414 } 1415 1416 if (tb[IFLA_MASTER]) { 1417 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1418 if (err) 1419 goto errout; 1420 modified = 1; 1421 } 1422 1423 if (tb[IFLA_TXQLEN]) 1424 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1425 1426 if (tb[IFLA_OPERSTATE]) 1427 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1428 1429 if (tb[IFLA_LINKMODE]) { 1430 write_lock_bh(&dev_base_lock); 1431 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1432 write_unlock_bh(&dev_base_lock); 1433 } 1434 1435 if (tb[IFLA_VFINFO_LIST]) { 1436 struct nlattr *attr; 1437 int rem; 1438 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1439 if (nla_type(attr) != IFLA_VF_INFO) { 1440 err = -EINVAL; 1441 goto errout; 1442 } 1443 err = do_setvfinfo(dev, attr); 1444 if (err < 0) 1445 goto errout; 1446 modified = 1; 1447 } 1448 } 1449 err = 0; 1450 1451 if (tb[IFLA_VF_PORTS]) { 1452 struct nlattr *port[IFLA_PORT_MAX+1]; 1453 struct nlattr *attr; 1454 int vf; 1455 int rem; 1456 1457 err = -EOPNOTSUPP; 1458 if (!ops->ndo_set_vf_port) 1459 goto errout; 1460 1461 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1462 if (nla_type(attr) != IFLA_VF_PORT) 1463 continue; 1464 err = nla_parse_nested(port, IFLA_PORT_MAX, 1465 attr, ifla_port_policy); 1466 if (err < 0) 1467 goto errout; 1468 if (!port[IFLA_PORT_VF]) { 1469 err = -EOPNOTSUPP; 1470 goto errout; 1471 } 1472 vf = nla_get_u32(port[IFLA_PORT_VF]); 1473 err = ops->ndo_set_vf_port(dev, vf, port); 1474 if (err < 0) 1475 goto errout; 1476 modified = 1; 1477 } 1478 } 1479 err = 0; 1480 1481 if (tb[IFLA_PORT_SELF]) { 1482 struct nlattr *port[IFLA_PORT_MAX+1]; 1483 1484 err = nla_parse_nested(port, IFLA_PORT_MAX, 1485 tb[IFLA_PORT_SELF], ifla_port_policy); 1486 if (err < 0) 1487 goto errout; 1488 1489 err = -EOPNOTSUPP; 1490 if (ops->ndo_set_vf_port) 1491 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1492 if (err < 0) 1493 goto errout; 1494 modified = 1; 1495 } 1496 1497 if (tb[IFLA_AF_SPEC]) { 1498 struct nlattr *af; 1499 int rem; 1500 1501 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1502 const struct rtnl_af_ops *af_ops; 1503 1504 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1505 BUG(); 1506 1507 err = af_ops->set_link_af(dev, af); 1508 if (err < 0) 1509 goto errout; 1510 1511 modified = 1; 1512 } 1513 } 1514 err = 0; 1515 1516 errout: 1517 if (err < 0 && modified && net_ratelimit()) 1518 printk(KERN_WARNING "A link change request failed with " 1519 "some changes committed already. Interface %s may " 1520 "have been left with an inconsistent configuration, " 1521 "please check.\n", dev->name); 1522 1523 if (send_addr_notify) 1524 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1525 1526 return err; 1527 } 1528 1529 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1530 { 1531 struct net *net = sock_net(skb->sk); 1532 struct ifinfomsg *ifm; 1533 struct net_device *dev; 1534 int err; 1535 struct nlattr *tb[IFLA_MAX+1]; 1536 char ifname[IFNAMSIZ]; 1537 1538 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1539 if (err < 0) 1540 goto errout; 1541 1542 if (tb[IFLA_IFNAME]) 1543 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1544 else 1545 ifname[0] = '\0'; 1546 1547 err = -EINVAL; 1548 ifm = nlmsg_data(nlh); 1549 if (ifm->ifi_index > 0) 1550 dev = __dev_get_by_index(net, ifm->ifi_index); 1551 else if (tb[IFLA_IFNAME]) 1552 dev = __dev_get_by_name(net, ifname); 1553 else 1554 goto errout; 1555 1556 if (dev == NULL) { 1557 err = -ENODEV; 1558 goto errout; 1559 } 1560 1561 err = validate_linkmsg(dev, tb); 1562 if (err < 0) 1563 goto errout; 1564 1565 err = do_setlink(dev, ifm, tb, ifname, 0); 1566 errout: 1567 return err; 1568 } 1569 1570 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1571 { 1572 struct net *net = sock_net(skb->sk); 1573 const struct rtnl_link_ops *ops; 1574 struct net_device *dev; 1575 struct ifinfomsg *ifm; 1576 char ifname[IFNAMSIZ]; 1577 struct nlattr *tb[IFLA_MAX+1]; 1578 int err; 1579 LIST_HEAD(list_kill); 1580 1581 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1582 if (err < 0) 1583 return err; 1584 1585 if (tb[IFLA_IFNAME]) 1586 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1587 1588 ifm = nlmsg_data(nlh); 1589 if (ifm->ifi_index > 0) 1590 dev = __dev_get_by_index(net, ifm->ifi_index); 1591 else if (tb[IFLA_IFNAME]) 1592 dev = __dev_get_by_name(net, ifname); 1593 else 1594 return -EINVAL; 1595 1596 if (!dev) 1597 return -ENODEV; 1598 1599 ops = dev->rtnl_link_ops; 1600 if (!ops) 1601 return -EOPNOTSUPP; 1602 1603 ops->dellink(dev, &list_kill); 1604 unregister_netdevice_many(&list_kill); 1605 list_del(&list_kill); 1606 return 0; 1607 } 1608 1609 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1610 { 1611 unsigned int old_flags; 1612 int err; 1613 1614 old_flags = dev->flags; 1615 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1616 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1617 if (err < 0) 1618 return err; 1619 } 1620 1621 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1622 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1623 1624 __dev_notify_flags(dev, old_flags); 1625 return 0; 1626 } 1627 EXPORT_SYMBOL(rtnl_configure_link); 1628 1629 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1630 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1631 { 1632 int err; 1633 struct net_device *dev; 1634 unsigned int num_queues = 1; 1635 unsigned int real_num_queues = 1; 1636 1637 if (ops->get_tx_queues) { 1638 err = ops->get_tx_queues(src_net, tb, &num_queues, 1639 &real_num_queues); 1640 if (err) 1641 goto err; 1642 } 1643 err = -ENOMEM; 1644 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1645 if (!dev) 1646 goto err; 1647 1648 dev_net_set(dev, net); 1649 dev->rtnl_link_ops = ops; 1650 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1651 1652 if (tb[IFLA_MTU]) 1653 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1654 if (tb[IFLA_ADDRESS]) 1655 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1656 nla_len(tb[IFLA_ADDRESS])); 1657 if (tb[IFLA_BROADCAST]) 1658 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1659 nla_len(tb[IFLA_BROADCAST])); 1660 if (tb[IFLA_TXQLEN]) 1661 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1662 if (tb[IFLA_OPERSTATE]) 1663 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1664 if (tb[IFLA_LINKMODE]) 1665 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1666 if (tb[IFLA_GROUP]) 1667 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1668 1669 return dev; 1670 1671 err: 1672 return ERR_PTR(err); 1673 } 1674 EXPORT_SYMBOL(rtnl_create_link); 1675 1676 static int rtnl_group_changelink(struct net *net, int group, 1677 struct ifinfomsg *ifm, 1678 struct nlattr **tb) 1679 { 1680 struct net_device *dev; 1681 int err; 1682 1683 for_each_netdev(net, dev) { 1684 if (dev->group == group) { 1685 err = do_setlink(dev, ifm, tb, NULL, 0); 1686 if (err < 0) 1687 return err; 1688 } 1689 } 1690 1691 return 0; 1692 } 1693 1694 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1695 { 1696 struct net *net = sock_net(skb->sk); 1697 const struct rtnl_link_ops *ops; 1698 struct net_device *dev; 1699 struct ifinfomsg *ifm; 1700 char kind[MODULE_NAME_LEN]; 1701 char ifname[IFNAMSIZ]; 1702 struct nlattr *tb[IFLA_MAX+1]; 1703 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1704 int err; 1705 1706 #ifdef CONFIG_MODULES 1707 replay: 1708 #endif 1709 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1710 if (err < 0) 1711 return err; 1712 1713 if (tb[IFLA_IFNAME]) 1714 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1715 else 1716 ifname[0] = '\0'; 1717 1718 ifm = nlmsg_data(nlh); 1719 if (ifm->ifi_index > 0) 1720 dev = __dev_get_by_index(net, ifm->ifi_index); 1721 else { 1722 if (ifname[0]) 1723 dev = __dev_get_by_name(net, ifname); 1724 else 1725 dev = NULL; 1726 } 1727 1728 err = validate_linkmsg(dev, tb); 1729 if (err < 0) 1730 return err; 1731 1732 if (tb[IFLA_LINKINFO]) { 1733 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1734 tb[IFLA_LINKINFO], ifla_info_policy); 1735 if (err < 0) 1736 return err; 1737 } else 1738 memset(linkinfo, 0, sizeof(linkinfo)); 1739 1740 if (linkinfo[IFLA_INFO_KIND]) { 1741 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1742 ops = rtnl_link_ops_get(kind); 1743 } else { 1744 kind[0] = '\0'; 1745 ops = NULL; 1746 } 1747 1748 if (1) { 1749 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1750 struct net *dest_net; 1751 1752 if (ops) { 1753 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1754 err = nla_parse_nested(attr, ops->maxtype, 1755 linkinfo[IFLA_INFO_DATA], 1756 ops->policy); 1757 if (err < 0) 1758 return err; 1759 data = attr; 1760 } 1761 if (ops->validate) { 1762 err = ops->validate(tb, data); 1763 if (err < 0) 1764 return err; 1765 } 1766 } 1767 1768 if (dev) { 1769 int modified = 0; 1770 1771 if (nlh->nlmsg_flags & NLM_F_EXCL) 1772 return -EEXIST; 1773 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1774 return -EOPNOTSUPP; 1775 1776 if (linkinfo[IFLA_INFO_DATA]) { 1777 if (!ops || ops != dev->rtnl_link_ops || 1778 !ops->changelink) 1779 return -EOPNOTSUPP; 1780 1781 err = ops->changelink(dev, tb, data); 1782 if (err < 0) 1783 return err; 1784 modified = 1; 1785 } 1786 1787 return do_setlink(dev, ifm, tb, ifname, modified); 1788 } 1789 1790 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1791 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1792 return rtnl_group_changelink(net, 1793 nla_get_u32(tb[IFLA_GROUP]), 1794 ifm, tb); 1795 return -ENODEV; 1796 } 1797 1798 if (ifm->ifi_index) 1799 return -EOPNOTSUPP; 1800 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1801 return -EOPNOTSUPP; 1802 1803 if (!ops) { 1804 #ifdef CONFIG_MODULES 1805 if (kind[0]) { 1806 __rtnl_unlock(); 1807 request_module("rtnl-link-%s", kind); 1808 rtnl_lock(); 1809 ops = rtnl_link_ops_get(kind); 1810 if (ops) 1811 goto replay; 1812 } 1813 #endif 1814 return -EOPNOTSUPP; 1815 } 1816 1817 if (!ifname[0]) 1818 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1819 1820 dest_net = rtnl_link_get_net(net, tb); 1821 if (IS_ERR(dest_net)) 1822 return PTR_ERR(dest_net); 1823 1824 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1825 1826 if (IS_ERR(dev)) 1827 err = PTR_ERR(dev); 1828 else if (ops->newlink) 1829 err = ops->newlink(net, dev, tb, data); 1830 else 1831 err = register_netdevice(dev); 1832 1833 if (err < 0 && !IS_ERR(dev)) 1834 free_netdev(dev); 1835 if (err < 0) 1836 goto out; 1837 1838 err = rtnl_configure_link(dev, ifm); 1839 if (err < 0) 1840 unregister_netdevice(dev); 1841 out: 1842 put_net(dest_net); 1843 return err; 1844 } 1845 } 1846 1847 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1848 { 1849 struct net *net = sock_net(skb->sk); 1850 struct ifinfomsg *ifm; 1851 char ifname[IFNAMSIZ]; 1852 struct nlattr *tb[IFLA_MAX+1]; 1853 struct net_device *dev = NULL; 1854 struct sk_buff *nskb; 1855 int err; 1856 u32 ext_filter_mask = 0; 1857 1858 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1859 if (err < 0) 1860 return err; 1861 1862 if (tb[IFLA_IFNAME]) 1863 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1864 1865 if (tb[IFLA_EXT_MASK]) 1866 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1867 1868 ifm = nlmsg_data(nlh); 1869 if (ifm->ifi_index > 0) 1870 dev = __dev_get_by_index(net, ifm->ifi_index); 1871 else if (tb[IFLA_IFNAME]) 1872 dev = __dev_get_by_name(net, ifname); 1873 else 1874 return -EINVAL; 1875 1876 if (dev == NULL) 1877 return -ENODEV; 1878 1879 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1880 if (nskb == NULL) 1881 return -ENOBUFS; 1882 1883 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1884 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1885 if (err < 0) { 1886 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1887 WARN_ON(err == -EMSGSIZE); 1888 kfree_skb(nskb); 1889 } else 1890 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1891 1892 return err; 1893 } 1894 1895 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1896 { 1897 struct net *net = sock_net(skb->sk); 1898 struct net_device *dev; 1899 struct nlattr *tb[IFLA_MAX+1]; 1900 u32 ext_filter_mask = 0; 1901 u16 min_ifinfo_dump_size = 0; 1902 1903 nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, ifla_policy); 1904 1905 if (tb[IFLA_EXT_MASK]) 1906 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1907 1908 if (!ext_filter_mask) 1909 return NLMSG_GOODSIZE; 1910 /* 1911 * traverse the list of net devices and compute the minimum 1912 * buffer size based upon the filter mask. 1913 */ 1914 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1915 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1916 if_nlmsg_size(dev, 1917 ext_filter_mask)); 1918 } 1919 1920 return min_ifinfo_dump_size; 1921 } 1922 1923 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1924 { 1925 int idx; 1926 int s_idx = cb->family; 1927 1928 if (s_idx == 0) 1929 s_idx = 1; 1930 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1931 int type = cb->nlh->nlmsg_type-RTM_BASE; 1932 if (idx < s_idx || idx == PF_PACKET) 1933 continue; 1934 if (rtnl_msg_handlers[idx] == NULL || 1935 rtnl_msg_handlers[idx][type].dumpit == NULL) 1936 continue; 1937 if (idx > s_idx) 1938 memset(&cb->args[0], 0, sizeof(cb->args)); 1939 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1940 break; 1941 } 1942 cb->family = idx; 1943 1944 return skb->len; 1945 } 1946 1947 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1948 { 1949 struct net *net = dev_net(dev); 1950 struct sk_buff *skb; 1951 int err = -ENOBUFS; 1952 size_t if_info_size; 1953 1954 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL); 1955 if (skb == NULL) 1956 goto errout; 1957 1958 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 1959 if (err < 0) { 1960 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1961 WARN_ON(err == -EMSGSIZE); 1962 kfree_skb(skb); 1963 goto errout; 1964 } 1965 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1966 return; 1967 errout: 1968 if (err < 0) 1969 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1970 } 1971 1972 /* Protected by RTNL sempahore. */ 1973 static struct rtattr **rta_buf; 1974 static int rtattr_max; 1975 1976 /* Process one rtnetlink message. */ 1977 1978 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1979 { 1980 struct net *net = sock_net(skb->sk); 1981 rtnl_doit_func doit; 1982 int sz_idx, kind; 1983 int min_len; 1984 int family; 1985 int type; 1986 int err; 1987 1988 type = nlh->nlmsg_type; 1989 if (type > RTM_MAX) 1990 return -EOPNOTSUPP; 1991 1992 type -= RTM_BASE; 1993 1994 /* All the messages must have at least 1 byte length */ 1995 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1996 return 0; 1997 1998 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1999 sz_idx = type>>2; 2000 kind = type&3; 2001 2002 if (kind != 2 && !capable(CAP_NET_ADMIN)) 2003 return -EPERM; 2004 2005 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2006 struct sock *rtnl; 2007 rtnl_dumpit_func dumpit; 2008 rtnl_calcit_func calcit; 2009 u16 min_dump_alloc = 0; 2010 2011 dumpit = rtnl_get_dumpit(family, type); 2012 if (dumpit == NULL) 2013 return -EOPNOTSUPP; 2014 calcit = rtnl_get_calcit(family, type); 2015 if (calcit) 2016 min_dump_alloc = calcit(skb, nlh); 2017 2018 __rtnl_unlock(); 2019 rtnl = net->rtnl; 2020 err = netlink_dump_start(rtnl, skb, nlh, dumpit, 2021 NULL, min_dump_alloc); 2022 rtnl_lock(); 2023 return err; 2024 } 2025 2026 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 2027 2028 min_len = rtm_min[sz_idx]; 2029 if (nlh->nlmsg_len < min_len) 2030 return -EINVAL; 2031 2032 if (nlh->nlmsg_len > min_len) { 2033 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 2034 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 2035 2036 while (RTA_OK(attr, attrlen)) { 2037 unsigned flavor = attr->rta_type; 2038 if (flavor) { 2039 if (flavor > rta_max[sz_idx]) 2040 return -EINVAL; 2041 rta_buf[flavor-1] = attr; 2042 } 2043 attr = RTA_NEXT(attr, attrlen); 2044 } 2045 } 2046 2047 doit = rtnl_get_doit(family, type); 2048 if (doit == NULL) 2049 return -EOPNOTSUPP; 2050 2051 return doit(skb, nlh, (void *)&rta_buf[0]); 2052 } 2053 2054 static void rtnetlink_rcv(struct sk_buff *skb) 2055 { 2056 rtnl_lock(); 2057 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2058 rtnl_unlock(); 2059 } 2060 2061 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2062 { 2063 struct net_device *dev = ptr; 2064 2065 switch (event) { 2066 case NETDEV_UP: 2067 case NETDEV_DOWN: 2068 case NETDEV_PRE_UP: 2069 case NETDEV_POST_INIT: 2070 case NETDEV_REGISTER: 2071 case NETDEV_CHANGE: 2072 case NETDEV_PRE_TYPE_CHANGE: 2073 case NETDEV_GOING_DOWN: 2074 case NETDEV_UNREGISTER: 2075 case NETDEV_UNREGISTER_BATCH: 2076 case NETDEV_RELEASE: 2077 case NETDEV_JOIN: 2078 break; 2079 default: 2080 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2081 break; 2082 } 2083 return NOTIFY_DONE; 2084 } 2085 2086 static struct notifier_block rtnetlink_dev_notifier = { 2087 .notifier_call = rtnetlink_event, 2088 }; 2089 2090 2091 static int __net_init rtnetlink_net_init(struct net *net) 2092 { 2093 struct sock *sk; 2094 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 2095 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 2096 if (!sk) 2097 return -ENOMEM; 2098 net->rtnl = sk; 2099 return 0; 2100 } 2101 2102 static void __net_exit rtnetlink_net_exit(struct net *net) 2103 { 2104 netlink_kernel_release(net->rtnl); 2105 net->rtnl = NULL; 2106 } 2107 2108 static struct pernet_operations rtnetlink_net_ops = { 2109 .init = rtnetlink_net_init, 2110 .exit = rtnetlink_net_exit, 2111 }; 2112 2113 void __init rtnetlink_init(void) 2114 { 2115 int i; 2116 2117 rtattr_max = 0; 2118 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 2119 if (rta_max[i] > rtattr_max) 2120 rtattr_max = rta_max[i]; 2121 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 2122 if (!rta_buf) 2123 panic("rtnetlink_init: cannot allocate rta_buf\n"); 2124 2125 if (register_pernet_subsys(&rtnetlink_net_ops)) 2126 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2127 2128 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 2129 register_netdevice_notifier(&rtnetlink_dev_notifier); 2130 2131 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2132 rtnl_dump_ifinfo, rtnl_calcit); 2133 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2134 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2135 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2136 2137 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2138 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2139 } 2140 2141