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