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 if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1064 ifla_policy) >= 0) { 1065 1066 if (tb[IFLA_EXT_MASK]) 1067 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1068 } 1069 1070 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1071 idx = 0; 1072 head = &net->dev_index_head[h]; 1073 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 1074 if (idx < s_idx) 1075 goto cont; 1076 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1077 NETLINK_CB(cb->skb).pid, 1078 cb->nlh->nlmsg_seq, 0, 1079 NLM_F_MULTI, 1080 ext_filter_mask) <= 0) 1081 goto out; 1082 1083 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1084 cont: 1085 idx++; 1086 } 1087 } 1088 out: 1089 rcu_read_unlock(); 1090 cb->args[1] = idx; 1091 cb->args[0] = h; 1092 1093 return skb->len; 1094 } 1095 1096 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1097 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1098 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1099 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1100 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1101 [IFLA_MTU] = { .type = NLA_U32 }, 1102 [IFLA_LINK] = { .type = NLA_U32 }, 1103 [IFLA_MASTER] = { .type = NLA_U32 }, 1104 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1105 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1106 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1107 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1108 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1109 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1110 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1111 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1112 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1113 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1114 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1115 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1116 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1117 }; 1118 EXPORT_SYMBOL(ifla_policy); 1119 1120 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1121 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1122 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1123 }; 1124 1125 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1126 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1127 }; 1128 1129 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1130 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1131 .len = sizeof(struct ifla_vf_mac) }, 1132 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1133 .len = sizeof(struct ifla_vf_vlan) }, 1134 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1135 .len = sizeof(struct ifla_vf_tx_rate) }, 1136 }; 1137 1138 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1139 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1140 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1141 .len = PORT_PROFILE_MAX }, 1142 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1143 .len = sizeof(struct ifla_port_vsi)}, 1144 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1145 .len = PORT_UUID_MAX }, 1146 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1147 .len = PORT_UUID_MAX }, 1148 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1149 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1150 }; 1151 1152 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1153 { 1154 struct net *net; 1155 /* Examine the link attributes and figure out which 1156 * network namespace we are talking about. 1157 */ 1158 if (tb[IFLA_NET_NS_PID]) 1159 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1160 else if (tb[IFLA_NET_NS_FD]) 1161 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1162 else 1163 net = get_net(src_net); 1164 return net; 1165 } 1166 EXPORT_SYMBOL(rtnl_link_get_net); 1167 1168 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1169 { 1170 if (dev) { 1171 if (tb[IFLA_ADDRESS] && 1172 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1173 return -EINVAL; 1174 1175 if (tb[IFLA_BROADCAST] && 1176 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1177 return -EINVAL; 1178 } 1179 1180 if (tb[IFLA_AF_SPEC]) { 1181 struct nlattr *af; 1182 int rem, err; 1183 1184 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1185 const struct rtnl_af_ops *af_ops; 1186 1187 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1188 return -EAFNOSUPPORT; 1189 1190 if (!af_ops->set_link_af) 1191 return -EOPNOTSUPP; 1192 1193 if (af_ops->validate_link_af) { 1194 err = af_ops->validate_link_af(dev, af); 1195 if (err < 0) 1196 return err; 1197 } 1198 } 1199 } 1200 1201 return 0; 1202 } 1203 1204 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1205 { 1206 int rem, err = -EINVAL; 1207 struct nlattr *vf; 1208 const struct net_device_ops *ops = dev->netdev_ops; 1209 1210 nla_for_each_nested(vf, attr, rem) { 1211 switch (nla_type(vf)) { 1212 case IFLA_VF_MAC: { 1213 struct ifla_vf_mac *ivm; 1214 ivm = nla_data(vf); 1215 err = -EOPNOTSUPP; 1216 if (ops->ndo_set_vf_mac) 1217 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1218 ivm->mac); 1219 break; 1220 } 1221 case IFLA_VF_VLAN: { 1222 struct ifla_vf_vlan *ivv; 1223 ivv = nla_data(vf); 1224 err = -EOPNOTSUPP; 1225 if (ops->ndo_set_vf_vlan) 1226 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1227 ivv->vlan, 1228 ivv->qos); 1229 break; 1230 } 1231 case IFLA_VF_TX_RATE: { 1232 struct ifla_vf_tx_rate *ivt; 1233 ivt = nla_data(vf); 1234 err = -EOPNOTSUPP; 1235 if (ops->ndo_set_vf_tx_rate) 1236 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1237 ivt->rate); 1238 break; 1239 } 1240 case IFLA_VF_SPOOFCHK: { 1241 struct ifla_vf_spoofchk *ivs; 1242 ivs = nla_data(vf); 1243 err = -EOPNOTSUPP; 1244 if (ops->ndo_set_vf_spoofchk) 1245 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1246 ivs->setting); 1247 break; 1248 } 1249 default: 1250 err = -EINVAL; 1251 break; 1252 } 1253 if (err) 1254 break; 1255 } 1256 return err; 1257 } 1258 1259 static int do_set_master(struct net_device *dev, int ifindex) 1260 { 1261 struct net_device *master_dev; 1262 const struct net_device_ops *ops; 1263 int err; 1264 1265 if (dev->master) { 1266 if (dev->master->ifindex == ifindex) 1267 return 0; 1268 ops = dev->master->netdev_ops; 1269 if (ops->ndo_del_slave) { 1270 err = ops->ndo_del_slave(dev->master, dev); 1271 if (err) 1272 return err; 1273 } else { 1274 return -EOPNOTSUPP; 1275 } 1276 } 1277 1278 if (ifindex) { 1279 master_dev = __dev_get_by_index(dev_net(dev), ifindex); 1280 if (!master_dev) 1281 return -EINVAL; 1282 ops = master_dev->netdev_ops; 1283 if (ops->ndo_add_slave) { 1284 err = ops->ndo_add_slave(master_dev, dev); 1285 if (err) 1286 return err; 1287 } else { 1288 return -EOPNOTSUPP; 1289 } 1290 } 1291 return 0; 1292 } 1293 1294 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1295 struct nlattr **tb, char *ifname, int modified) 1296 { 1297 const struct net_device_ops *ops = dev->netdev_ops; 1298 int send_addr_notify = 0; 1299 int err; 1300 1301 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1302 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1303 if (IS_ERR(net)) { 1304 err = PTR_ERR(net); 1305 goto errout; 1306 } 1307 err = dev_change_net_namespace(dev, net, ifname); 1308 put_net(net); 1309 if (err) 1310 goto errout; 1311 modified = 1; 1312 } 1313 1314 if (tb[IFLA_MAP]) { 1315 struct rtnl_link_ifmap *u_map; 1316 struct ifmap k_map; 1317 1318 if (!ops->ndo_set_config) { 1319 err = -EOPNOTSUPP; 1320 goto errout; 1321 } 1322 1323 if (!netif_device_present(dev)) { 1324 err = -ENODEV; 1325 goto errout; 1326 } 1327 1328 u_map = nla_data(tb[IFLA_MAP]); 1329 k_map.mem_start = (unsigned long) u_map->mem_start; 1330 k_map.mem_end = (unsigned long) u_map->mem_end; 1331 k_map.base_addr = (unsigned short) u_map->base_addr; 1332 k_map.irq = (unsigned char) u_map->irq; 1333 k_map.dma = (unsigned char) u_map->dma; 1334 k_map.port = (unsigned char) u_map->port; 1335 1336 err = ops->ndo_set_config(dev, &k_map); 1337 if (err < 0) 1338 goto errout; 1339 1340 modified = 1; 1341 } 1342 1343 if (tb[IFLA_ADDRESS]) { 1344 struct sockaddr *sa; 1345 int len; 1346 1347 if (!ops->ndo_set_mac_address) { 1348 err = -EOPNOTSUPP; 1349 goto errout; 1350 } 1351 1352 if (!netif_device_present(dev)) { 1353 err = -ENODEV; 1354 goto errout; 1355 } 1356 1357 len = sizeof(sa_family_t) + dev->addr_len; 1358 sa = kmalloc(len, GFP_KERNEL); 1359 if (!sa) { 1360 err = -ENOMEM; 1361 goto errout; 1362 } 1363 sa->sa_family = dev->type; 1364 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1365 dev->addr_len); 1366 err = ops->ndo_set_mac_address(dev, sa); 1367 kfree(sa); 1368 if (err) 1369 goto errout; 1370 send_addr_notify = 1; 1371 modified = 1; 1372 } 1373 1374 if (tb[IFLA_MTU]) { 1375 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1376 if (err < 0) 1377 goto errout; 1378 modified = 1; 1379 } 1380 1381 if (tb[IFLA_GROUP]) { 1382 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1383 modified = 1; 1384 } 1385 1386 /* 1387 * Interface selected by interface index but interface 1388 * name provided implies that a name change has been 1389 * requested. 1390 */ 1391 if (ifm->ifi_index > 0 && ifname[0]) { 1392 err = dev_change_name(dev, ifname); 1393 if (err < 0) 1394 goto errout; 1395 modified = 1; 1396 } 1397 1398 if (tb[IFLA_IFALIAS]) { 1399 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1400 nla_len(tb[IFLA_IFALIAS])); 1401 if (err < 0) 1402 goto errout; 1403 modified = 1; 1404 } 1405 1406 if (tb[IFLA_BROADCAST]) { 1407 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1408 send_addr_notify = 1; 1409 } 1410 1411 if (ifm->ifi_flags || ifm->ifi_change) { 1412 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1413 if (err < 0) 1414 goto errout; 1415 } 1416 1417 if (tb[IFLA_MASTER]) { 1418 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1419 if (err) 1420 goto errout; 1421 modified = 1; 1422 } 1423 1424 if (tb[IFLA_TXQLEN]) 1425 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1426 1427 if (tb[IFLA_OPERSTATE]) 1428 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1429 1430 if (tb[IFLA_LINKMODE]) { 1431 write_lock_bh(&dev_base_lock); 1432 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1433 write_unlock_bh(&dev_base_lock); 1434 } 1435 1436 if (tb[IFLA_VFINFO_LIST]) { 1437 struct nlattr *attr; 1438 int rem; 1439 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1440 if (nla_type(attr) != IFLA_VF_INFO) { 1441 err = -EINVAL; 1442 goto errout; 1443 } 1444 err = do_setvfinfo(dev, attr); 1445 if (err < 0) 1446 goto errout; 1447 modified = 1; 1448 } 1449 } 1450 err = 0; 1451 1452 if (tb[IFLA_VF_PORTS]) { 1453 struct nlattr *port[IFLA_PORT_MAX+1]; 1454 struct nlattr *attr; 1455 int vf; 1456 int rem; 1457 1458 err = -EOPNOTSUPP; 1459 if (!ops->ndo_set_vf_port) 1460 goto errout; 1461 1462 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1463 if (nla_type(attr) != IFLA_VF_PORT) 1464 continue; 1465 err = nla_parse_nested(port, IFLA_PORT_MAX, 1466 attr, ifla_port_policy); 1467 if (err < 0) 1468 goto errout; 1469 if (!port[IFLA_PORT_VF]) { 1470 err = -EOPNOTSUPP; 1471 goto errout; 1472 } 1473 vf = nla_get_u32(port[IFLA_PORT_VF]); 1474 err = ops->ndo_set_vf_port(dev, vf, port); 1475 if (err < 0) 1476 goto errout; 1477 modified = 1; 1478 } 1479 } 1480 err = 0; 1481 1482 if (tb[IFLA_PORT_SELF]) { 1483 struct nlattr *port[IFLA_PORT_MAX+1]; 1484 1485 err = nla_parse_nested(port, IFLA_PORT_MAX, 1486 tb[IFLA_PORT_SELF], ifla_port_policy); 1487 if (err < 0) 1488 goto errout; 1489 1490 err = -EOPNOTSUPP; 1491 if (ops->ndo_set_vf_port) 1492 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1493 if (err < 0) 1494 goto errout; 1495 modified = 1; 1496 } 1497 1498 if (tb[IFLA_AF_SPEC]) { 1499 struct nlattr *af; 1500 int rem; 1501 1502 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1503 const struct rtnl_af_ops *af_ops; 1504 1505 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1506 BUG(); 1507 1508 err = af_ops->set_link_af(dev, af); 1509 if (err < 0) 1510 goto errout; 1511 1512 modified = 1; 1513 } 1514 } 1515 err = 0; 1516 1517 errout: 1518 if (err < 0 && modified && net_ratelimit()) 1519 printk(KERN_WARNING "A link change request failed with " 1520 "some changes committed already. Interface %s may " 1521 "have been left with an inconsistent configuration, " 1522 "please check.\n", dev->name); 1523 1524 if (send_addr_notify) 1525 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1526 1527 return err; 1528 } 1529 1530 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1531 { 1532 struct net *net = sock_net(skb->sk); 1533 struct ifinfomsg *ifm; 1534 struct net_device *dev; 1535 int err; 1536 struct nlattr *tb[IFLA_MAX+1]; 1537 char ifname[IFNAMSIZ]; 1538 1539 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1540 if (err < 0) 1541 goto errout; 1542 1543 if (tb[IFLA_IFNAME]) 1544 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1545 else 1546 ifname[0] = '\0'; 1547 1548 err = -EINVAL; 1549 ifm = nlmsg_data(nlh); 1550 if (ifm->ifi_index > 0) 1551 dev = __dev_get_by_index(net, ifm->ifi_index); 1552 else if (tb[IFLA_IFNAME]) 1553 dev = __dev_get_by_name(net, ifname); 1554 else 1555 goto errout; 1556 1557 if (dev == NULL) { 1558 err = -ENODEV; 1559 goto errout; 1560 } 1561 1562 err = validate_linkmsg(dev, tb); 1563 if (err < 0) 1564 goto errout; 1565 1566 err = do_setlink(dev, ifm, tb, ifname, 0); 1567 errout: 1568 return err; 1569 } 1570 1571 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1572 { 1573 struct net *net = sock_net(skb->sk); 1574 const struct rtnl_link_ops *ops; 1575 struct net_device *dev; 1576 struct ifinfomsg *ifm; 1577 char ifname[IFNAMSIZ]; 1578 struct nlattr *tb[IFLA_MAX+1]; 1579 int err; 1580 LIST_HEAD(list_kill); 1581 1582 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1583 if (err < 0) 1584 return err; 1585 1586 if (tb[IFLA_IFNAME]) 1587 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1588 1589 ifm = nlmsg_data(nlh); 1590 if (ifm->ifi_index > 0) 1591 dev = __dev_get_by_index(net, ifm->ifi_index); 1592 else if (tb[IFLA_IFNAME]) 1593 dev = __dev_get_by_name(net, ifname); 1594 else 1595 return -EINVAL; 1596 1597 if (!dev) 1598 return -ENODEV; 1599 1600 ops = dev->rtnl_link_ops; 1601 if (!ops) 1602 return -EOPNOTSUPP; 1603 1604 ops->dellink(dev, &list_kill); 1605 unregister_netdevice_many(&list_kill); 1606 list_del(&list_kill); 1607 return 0; 1608 } 1609 1610 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1611 { 1612 unsigned int old_flags; 1613 int err; 1614 1615 old_flags = dev->flags; 1616 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1617 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1618 if (err < 0) 1619 return err; 1620 } 1621 1622 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1623 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1624 1625 __dev_notify_flags(dev, old_flags); 1626 return 0; 1627 } 1628 EXPORT_SYMBOL(rtnl_configure_link); 1629 1630 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1631 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1632 { 1633 int err; 1634 struct net_device *dev; 1635 unsigned int num_queues = 1; 1636 unsigned int real_num_queues = 1; 1637 1638 if (ops->get_tx_queues) { 1639 err = ops->get_tx_queues(src_net, tb, &num_queues, 1640 &real_num_queues); 1641 if (err) 1642 goto err; 1643 } 1644 err = -ENOMEM; 1645 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1646 if (!dev) 1647 goto err; 1648 1649 dev_net_set(dev, net); 1650 dev->rtnl_link_ops = ops; 1651 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1652 1653 if (tb[IFLA_MTU]) 1654 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1655 if (tb[IFLA_ADDRESS]) 1656 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1657 nla_len(tb[IFLA_ADDRESS])); 1658 if (tb[IFLA_BROADCAST]) 1659 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1660 nla_len(tb[IFLA_BROADCAST])); 1661 if (tb[IFLA_TXQLEN]) 1662 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1663 if (tb[IFLA_OPERSTATE]) 1664 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1665 if (tb[IFLA_LINKMODE]) 1666 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1667 if (tb[IFLA_GROUP]) 1668 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1669 1670 return dev; 1671 1672 err: 1673 return ERR_PTR(err); 1674 } 1675 EXPORT_SYMBOL(rtnl_create_link); 1676 1677 static int rtnl_group_changelink(struct net *net, int group, 1678 struct ifinfomsg *ifm, 1679 struct nlattr **tb) 1680 { 1681 struct net_device *dev; 1682 int err; 1683 1684 for_each_netdev(net, dev) { 1685 if (dev->group == group) { 1686 err = do_setlink(dev, ifm, tb, NULL, 0); 1687 if (err < 0) 1688 return err; 1689 } 1690 } 1691 1692 return 0; 1693 } 1694 1695 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1696 { 1697 struct net *net = sock_net(skb->sk); 1698 const struct rtnl_link_ops *ops; 1699 struct net_device *dev; 1700 struct ifinfomsg *ifm; 1701 char kind[MODULE_NAME_LEN]; 1702 char ifname[IFNAMSIZ]; 1703 struct nlattr *tb[IFLA_MAX+1]; 1704 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1705 int err; 1706 1707 #ifdef CONFIG_MODULES 1708 replay: 1709 #endif 1710 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1711 if (err < 0) 1712 return err; 1713 1714 if (tb[IFLA_IFNAME]) 1715 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1716 else 1717 ifname[0] = '\0'; 1718 1719 ifm = nlmsg_data(nlh); 1720 if (ifm->ifi_index > 0) 1721 dev = __dev_get_by_index(net, ifm->ifi_index); 1722 else { 1723 if (ifname[0]) 1724 dev = __dev_get_by_name(net, ifname); 1725 else 1726 dev = NULL; 1727 } 1728 1729 err = validate_linkmsg(dev, tb); 1730 if (err < 0) 1731 return err; 1732 1733 if (tb[IFLA_LINKINFO]) { 1734 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1735 tb[IFLA_LINKINFO], ifla_info_policy); 1736 if (err < 0) 1737 return err; 1738 } else 1739 memset(linkinfo, 0, sizeof(linkinfo)); 1740 1741 if (linkinfo[IFLA_INFO_KIND]) { 1742 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1743 ops = rtnl_link_ops_get(kind); 1744 } else { 1745 kind[0] = '\0'; 1746 ops = NULL; 1747 } 1748 1749 if (1) { 1750 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1751 struct net *dest_net; 1752 1753 if (ops) { 1754 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1755 err = nla_parse_nested(attr, ops->maxtype, 1756 linkinfo[IFLA_INFO_DATA], 1757 ops->policy); 1758 if (err < 0) 1759 return err; 1760 data = attr; 1761 } 1762 if (ops->validate) { 1763 err = ops->validate(tb, data); 1764 if (err < 0) 1765 return err; 1766 } 1767 } 1768 1769 if (dev) { 1770 int modified = 0; 1771 1772 if (nlh->nlmsg_flags & NLM_F_EXCL) 1773 return -EEXIST; 1774 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1775 return -EOPNOTSUPP; 1776 1777 if (linkinfo[IFLA_INFO_DATA]) { 1778 if (!ops || ops != dev->rtnl_link_ops || 1779 !ops->changelink) 1780 return -EOPNOTSUPP; 1781 1782 err = ops->changelink(dev, tb, data); 1783 if (err < 0) 1784 return err; 1785 modified = 1; 1786 } 1787 1788 return do_setlink(dev, ifm, tb, ifname, modified); 1789 } 1790 1791 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1792 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1793 return rtnl_group_changelink(net, 1794 nla_get_u32(tb[IFLA_GROUP]), 1795 ifm, tb); 1796 return -ENODEV; 1797 } 1798 1799 if (ifm->ifi_index) 1800 return -EOPNOTSUPP; 1801 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1802 return -EOPNOTSUPP; 1803 1804 if (!ops) { 1805 #ifdef CONFIG_MODULES 1806 if (kind[0]) { 1807 __rtnl_unlock(); 1808 request_module("rtnl-link-%s", kind); 1809 rtnl_lock(); 1810 ops = rtnl_link_ops_get(kind); 1811 if (ops) 1812 goto replay; 1813 } 1814 #endif 1815 return -EOPNOTSUPP; 1816 } 1817 1818 if (!ifname[0]) 1819 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1820 1821 dest_net = rtnl_link_get_net(net, tb); 1822 if (IS_ERR(dest_net)) 1823 return PTR_ERR(dest_net); 1824 1825 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1826 1827 if (IS_ERR(dev)) 1828 err = PTR_ERR(dev); 1829 else if (ops->newlink) 1830 err = ops->newlink(net, dev, tb, data); 1831 else 1832 err = register_netdevice(dev); 1833 1834 if (err < 0 && !IS_ERR(dev)) 1835 free_netdev(dev); 1836 if (err < 0) 1837 goto out; 1838 1839 err = rtnl_configure_link(dev, ifm); 1840 if (err < 0) 1841 unregister_netdevice(dev); 1842 out: 1843 put_net(dest_net); 1844 return err; 1845 } 1846 } 1847 1848 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1849 { 1850 struct net *net = sock_net(skb->sk); 1851 struct ifinfomsg *ifm; 1852 char ifname[IFNAMSIZ]; 1853 struct nlattr *tb[IFLA_MAX+1]; 1854 struct net_device *dev = NULL; 1855 struct sk_buff *nskb; 1856 int err; 1857 u32 ext_filter_mask = 0; 1858 1859 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1860 if (err < 0) 1861 return err; 1862 1863 if (tb[IFLA_IFNAME]) 1864 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1865 1866 if (tb[IFLA_EXT_MASK]) 1867 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1868 1869 ifm = nlmsg_data(nlh); 1870 if (ifm->ifi_index > 0) 1871 dev = __dev_get_by_index(net, ifm->ifi_index); 1872 else if (tb[IFLA_IFNAME]) 1873 dev = __dev_get_by_name(net, ifname); 1874 else 1875 return -EINVAL; 1876 1877 if (dev == NULL) 1878 return -ENODEV; 1879 1880 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1881 if (nskb == NULL) 1882 return -ENOBUFS; 1883 1884 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1885 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1886 if (err < 0) { 1887 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1888 WARN_ON(err == -EMSGSIZE); 1889 kfree_skb(nskb); 1890 } else 1891 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1892 1893 return err; 1894 } 1895 1896 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1897 { 1898 struct net *net = sock_net(skb->sk); 1899 struct net_device *dev; 1900 struct nlattr *tb[IFLA_MAX+1]; 1901 u32 ext_filter_mask = 0; 1902 u16 min_ifinfo_dump_size = 0; 1903 1904 if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1905 ifla_policy) >= 0) { 1906 if (tb[IFLA_EXT_MASK]) 1907 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1908 } 1909 1910 if (!ext_filter_mask) 1911 return NLMSG_GOODSIZE; 1912 /* 1913 * traverse the list of net devices and compute the minimum 1914 * buffer size based upon the filter mask. 1915 */ 1916 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1917 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1918 if_nlmsg_size(dev, 1919 ext_filter_mask)); 1920 } 1921 1922 return min_ifinfo_dump_size; 1923 } 1924 1925 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1926 { 1927 int idx; 1928 int s_idx = cb->family; 1929 1930 if (s_idx == 0) 1931 s_idx = 1; 1932 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1933 int type = cb->nlh->nlmsg_type-RTM_BASE; 1934 if (idx < s_idx || idx == PF_PACKET) 1935 continue; 1936 if (rtnl_msg_handlers[idx] == NULL || 1937 rtnl_msg_handlers[idx][type].dumpit == NULL) 1938 continue; 1939 if (idx > s_idx) 1940 memset(&cb->args[0], 0, sizeof(cb->args)); 1941 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1942 break; 1943 } 1944 cb->family = idx; 1945 1946 return skb->len; 1947 } 1948 1949 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1950 { 1951 struct net *net = dev_net(dev); 1952 struct sk_buff *skb; 1953 int err = -ENOBUFS; 1954 size_t if_info_size; 1955 1956 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL); 1957 if (skb == NULL) 1958 goto errout; 1959 1960 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 1961 if (err < 0) { 1962 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1963 WARN_ON(err == -EMSGSIZE); 1964 kfree_skb(skb); 1965 goto errout; 1966 } 1967 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1968 return; 1969 errout: 1970 if (err < 0) 1971 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1972 } 1973 1974 /* Protected by RTNL sempahore. */ 1975 static struct rtattr **rta_buf; 1976 static int rtattr_max; 1977 1978 /* Process one rtnetlink message. */ 1979 1980 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1981 { 1982 struct net *net = sock_net(skb->sk); 1983 rtnl_doit_func doit; 1984 int sz_idx, kind; 1985 int min_len; 1986 int family; 1987 int type; 1988 int err; 1989 1990 type = nlh->nlmsg_type; 1991 if (type > RTM_MAX) 1992 return -EOPNOTSUPP; 1993 1994 type -= RTM_BASE; 1995 1996 /* All the messages must have at least 1 byte length */ 1997 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1998 return 0; 1999 2000 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 2001 sz_idx = type>>2; 2002 kind = type&3; 2003 2004 if (kind != 2 && !capable(CAP_NET_ADMIN)) 2005 return -EPERM; 2006 2007 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2008 struct sock *rtnl; 2009 rtnl_dumpit_func dumpit; 2010 rtnl_calcit_func calcit; 2011 u16 min_dump_alloc = 0; 2012 2013 dumpit = rtnl_get_dumpit(family, type); 2014 if (dumpit == NULL) 2015 return -EOPNOTSUPP; 2016 calcit = rtnl_get_calcit(family, type); 2017 if (calcit) 2018 min_dump_alloc = calcit(skb, nlh); 2019 2020 __rtnl_unlock(); 2021 rtnl = net->rtnl; 2022 err = netlink_dump_start(rtnl, skb, nlh, dumpit, 2023 NULL, min_dump_alloc); 2024 rtnl_lock(); 2025 return err; 2026 } 2027 2028 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 2029 2030 min_len = rtm_min[sz_idx]; 2031 if (nlh->nlmsg_len < min_len) 2032 return -EINVAL; 2033 2034 if (nlh->nlmsg_len > min_len) { 2035 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 2036 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 2037 2038 while (RTA_OK(attr, attrlen)) { 2039 unsigned flavor = attr->rta_type; 2040 if (flavor) { 2041 if (flavor > rta_max[sz_idx]) 2042 return -EINVAL; 2043 rta_buf[flavor-1] = attr; 2044 } 2045 attr = RTA_NEXT(attr, attrlen); 2046 } 2047 } 2048 2049 doit = rtnl_get_doit(family, type); 2050 if (doit == NULL) 2051 return -EOPNOTSUPP; 2052 2053 return doit(skb, nlh, (void *)&rta_buf[0]); 2054 } 2055 2056 static void rtnetlink_rcv(struct sk_buff *skb) 2057 { 2058 rtnl_lock(); 2059 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2060 rtnl_unlock(); 2061 } 2062 2063 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2064 { 2065 struct net_device *dev = ptr; 2066 2067 switch (event) { 2068 case NETDEV_UP: 2069 case NETDEV_DOWN: 2070 case NETDEV_PRE_UP: 2071 case NETDEV_POST_INIT: 2072 case NETDEV_REGISTER: 2073 case NETDEV_CHANGE: 2074 case NETDEV_PRE_TYPE_CHANGE: 2075 case NETDEV_GOING_DOWN: 2076 case NETDEV_UNREGISTER: 2077 case NETDEV_UNREGISTER_BATCH: 2078 case NETDEV_RELEASE: 2079 case NETDEV_JOIN: 2080 break; 2081 default: 2082 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2083 break; 2084 } 2085 return NOTIFY_DONE; 2086 } 2087 2088 static struct notifier_block rtnetlink_dev_notifier = { 2089 .notifier_call = rtnetlink_event, 2090 }; 2091 2092 2093 static int __net_init rtnetlink_net_init(struct net *net) 2094 { 2095 struct sock *sk; 2096 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 2097 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 2098 if (!sk) 2099 return -ENOMEM; 2100 net->rtnl = sk; 2101 return 0; 2102 } 2103 2104 static void __net_exit rtnetlink_net_exit(struct net *net) 2105 { 2106 netlink_kernel_release(net->rtnl); 2107 net->rtnl = NULL; 2108 } 2109 2110 static struct pernet_operations rtnetlink_net_ops = { 2111 .init = rtnetlink_net_init, 2112 .exit = rtnetlink_net_exit, 2113 }; 2114 2115 void __init rtnetlink_init(void) 2116 { 2117 int i; 2118 2119 rtattr_max = 0; 2120 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 2121 if (rta_max[i] > rtattr_max) 2122 rtattr_max = rta_max[i]; 2123 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 2124 if (!rta_buf) 2125 panic("rtnetlink_init: cannot allocate rta_buf\n"); 2126 2127 if (register_pernet_subsys(&rtnetlink_net_ops)) 2128 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2129 2130 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 2131 register_netdevice_notifier(&rtnetlink_dev_notifier); 2132 2133 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2134 rtnl_dump_ifinfo, rtnl_calcit); 2135 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2136 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2137 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2138 2139 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2140 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2141 } 2142 2143