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 return size; 736 } else 737 return 0; 738 } 739 740 static size_t rtnl_port_size(const struct net_device *dev) 741 { 742 size_t port_size = nla_total_size(4) /* PORT_VF */ 743 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 744 + nla_total_size(sizeof(struct ifla_port_vsi)) 745 /* PORT_VSI_TYPE */ 746 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 747 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 748 + nla_total_size(1) /* PROT_VDP_REQUEST */ 749 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 750 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 751 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 752 + port_size; 753 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 754 + port_size; 755 756 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 757 return 0; 758 if (dev_num_vf(dev->dev.parent)) 759 return port_self_size + vf_ports_size + 760 vf_port_size * dev_num_vf(dev->dev.parent); 761 else 762 return port_self_size; 763 } 764 765 static noinline size_t if_nlmsg_size(const struct net_device *dev) 766 { 767 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 768 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 769 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 770 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 771 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 772 + nla_total_size(sizeof(struct rtnl_link_stats)) 773 + nla_total_size(sizeof(struct rtnl_link_stats64)) 774 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 775 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 776 + nla_total_size(4) /* IFLA_TXQLEN */ 777 + nla_total_size(4) /* IFLA_WEIGHT */ 778 + nla_total_size(4) /* IFLA_MTU */ 779 + nla_total_size(4) /* IFLA_LINK */ 780 + nla_total_size(4) /* IFLA_MASTER */ 781 + nla_total_size(1) /* IFLA_OPERSTATE */ 782 + nla_total_size(1) /* IFLA_LINKMODE */ 783 + nla_total_size(4) /* IFLA_NUM_VF */ 784 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */ 785 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 786 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 787 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 788 } 789 790 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 791 { 792 struct nlattr *vf_ports; 793 struct nlattr *vf_port; 794 int vf; 795 int err; 796 797 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 798 if (!vf_ports) 799 return -EMSGSIZE; 800 801 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 802 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 803 if (!vf_port) 804 goto nla_put_failure; 805 NLA_PUT_U32(skb, IFLA_PORT_VF, vf); 806 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 807 if (err == -EMSGSIZE) 808 goto nla_put_failure; 809 if (err) { 810 nla_nest_cancel(skb, vf_port); 811 continue; 812 } 813 nla_nest_end(skb, vf_port); 814 } 815 816 nla_nest_end(skb, vf_ports); 817 818 return 0; 819 820 nla_put_failure: 821 nla_nest_cancel(skb, vf_ports); 822 return -EMSGSIZE; 823 } 824 825 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 826 { 827 struct nlattr *port_self; 828 int err; 829 830 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 831 if (!port_self) 832 return -EMSGSIZE; 833 834 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 835 if (err) { 836 nla_nest_cancel(skb, port_self); 837 return (err == -EMSGSIZE) ? err : 0; 838 } 839 840 nla_nest_end(skb, port_self); 841 842 return 0; 843 } 844 845 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 846 { 847 int err; 848 849 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 850 return 0; 851 852 err = rtnl_port_self_fill(skb, dev); 853 if (err) 854 return err; 855 856 if (dev_num_vf(dev->dev.parent)) { 857 err = rtnl_vf_ports_fill(skb, dev); 858 if (err) 859 return err; 860 } 861 862 return 0; 863 } 864 865 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 866 int type, u32 pid, u32 seq, u32 change, 867 unsigned int flags) 868 { 869 struct ifinfomsg *ifm; 870 struct nlmsghdr *nlh; 871 struct rtnl_link_stats64 temp; 872 const struct rtnl_link_stats64 *stats; 873 struct nlattr *attr, *af_spec; 874 struct rtnl_af_ops *af_ops; 875 876 ASSERT_RTNL(); 877 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 878 if (nlh == NULL) 879 return -EMSGSIZE; 880 881 ifm = nlmsg_data(nlh); 882 ifm->ifi_family = AF_UNSPEC; 883 ifm->__ifi_pad = 0; 884 ifm->ifi_type = dev->type; 885 ifm->ifi_index = dev->ifindex; 886 ifm->ifi_flags = dev_get_flags(dev); 887 ifm->ifi_change = change; 888 889 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 890 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 891 NLA_PUT_U8(skb, IFLA_OPERSTATE, 892 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 893 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 894 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 895 NLA_PUT_U32(skb, IFLA_GROUP, dev->group); 896 897 if (dev->ifindex != dev->iflink) 898 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 899 900 if (dev->master) 901 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 902 903 if (dev->qdisc) 904 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 905 906 if (dev->ifalias) 907 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 908 909 if (1) { 910 struct rtnl_link_ifmap map = { 911 .mem_start = dev->mem_start, 912 .mem_end = dev->mem_end, 913 .base_addr = dev->base_addr, 914 .irq = dev->irq, 915 .dma = dev->dma, 916 .port = dev->if_port, 917 }; 918 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 919 } 920 921 if (dev->addr_len) { 922 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 923 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 924 } 925 926 attr = nla_reserve(skb, IFLA_STATS, 927 sizeof(struct rtnl_link_stats)); 928 if (attr == NULL) 929 goto nla_put_failure; 930 931 stats = dev_get_stats(dev, &temp); 932 copy_rtnl_link_stats(nla_data(attr), stats); 933 934 attr = nla_reserve(skb, IFLA_STATS64, 935 sizeof(struct rtnl_link_stats64)); 936 if (attr == NULL) 937 goto nla_put_failure; 938 copy_rtnl_link_stats64(nla_data(attr), stats); 939 940 if (dev->dev.parent) 941 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); 942 943 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) { 944 int i; 945 946 struct nlattr *vfinfo, *vf; 947 int num_vfs = dev_num_vf(dev->dev.parent); 948 949 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 950 if (!vfinfo) 951 goto nla_put_failure; 952 for (i = 0; i < num_vfs; i++) { 953 struct ifla_vf_info ivi; 954 struct ifla_vf_mac vf_mac; 955 struct ifla_vf_vlan vf_vlan; 956 struct ifla_vf_tx_rate vf_tx_rate; 957 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 958 break; 959 vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf; 960 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 961 vf_vlan.vlan = ivi.vlan; 962 vf_vlan.qos = ivi.qos; 963 vf_tx_rate.rate = ivi.tx_rate; 964 vf = nla_nest_start(skb, IFLA_VF_INFO); 965 if (!vf) { 966 nla_nest_cancel(skb, vfinfo); 967 goto nla_put_failure; 968 } 969 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac); 970 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan); 971 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate); 972 nla_nest_end(skb, vf); 973 } 974 nla_nest_end(skb, vfinfo); 975 } 976 977 if (rtnl_port_fill(skb, dev)) 978 goto nla_put_failure; 979 980 if (dev->rtnl_link_ops) { 981 if (rtnl_link_fill(skb, dev) < 0) 982 goto nla_put_failure; 983 } 984 985 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 986 goto nla_put_failure; 987 988 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 989 if (af_ops->fill_link_af) { 990 struct nlattr *af; 991 int err; 992 993 if (!(af = nla_nest_start(skb, af_ops->family))) 994 goto nla_put_failure; 995 996 err = af_ops->fill_link_af(skb, dev); 997 998 /* 999 * Caller may return ENODATA to indicate that there 1000 * was no data to be dumped. This is not an error, it 1001 * means we should trim the attribute header and 1002 * continue. 1003 */ 1004 if (err == -ENODATA) 1005 nla_nest_cancel(skb, af); 1006 else if (err < 0) 1007 goto nla_put_failure; 1008 1009 nla_nest_end(skb, af); 1010 } 1011 } 1012 1013 nla_nest_end(skb, af_spec); 1014 1015 return nlmsg_end(skb, nlh); 1016 1017 nla_put_failure: 1018 nlmsg_cancel(skb, nlh); 1019 return -EMSGSIZE; 1020 } 1021 1022 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1023 { 1024 struct net *net = sock_net(skb->sk); 1025 int h, s_h; 1026 int idx = 0, s_idx; 1027 struct net_device *dev; 1028 struct hlist_head *head; 1029 struct hlist_node *node; 1030 1031 s_h = cb->args[0]; 1032 s_idx = cb->args[1]; 1033 1034 rcu_read_lock(); 1035 cb->seq = net->dev_base_seq; 1036 1037 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1038 idx = 0; 1039 head = &net->dev_index_head[h]; 1040 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 1041 if (idx < s_idx) 1042 goto cont; 1043 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1044 NETLINK_CB(cb->skb).pid, 1045 cb->nlh->nlmsg_seq, 0, 1046 NLM_F_MULTI) <= 0) 1047 goto out; 1048 1049 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1050 cont: 1051 idx++; 1052 } 1053 } 1054 out: 1055 rcu_read_unlock(); 1056 cb->args[1] = idx; 1057 cb->args[0] = h; 1058 1059 return skb->len; 1060 } 1061 1062 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1063 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1064 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1065 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1066 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1067 [IFLA_MTU] = { .type = NLA_U32 }, 1068 [IFLA_LINK] = { .type = NLA_U32 }, 1069 [IFLA_MASTER] = { .type = NLA_U32 }, 1070 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1071 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1072 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1073 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1074 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1075 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1076 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1077 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1078 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1079 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1080 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1081 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1082 }; 1083 EXPORT_SYMBOL(ifla_policy); 1084 1085 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1086 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1087 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1088 }; 1089 1090 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1091 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1092 }; 1093 1094 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1095 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1096 .len = sizeof(struct ifla_vf_mac) }, 1097 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1098 .len = sizeof(struct ifla_vf_vlan) }, 1099 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1100 .len = sizeof(struct ifla_vf_tx_rate) }, 1101 }; 1102 1103 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1104 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1105 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1106 .len = PORT_PROFILE_MAX }, 1107 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1108 .len = sizeof(struct ifla_port_vsi)}, 1109 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1110 .len = PORT_UUID_MAX }, 1111 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1112 .len = PORT_UUID_MAX }, 1113 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1114 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1115 }; 1116 1117 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1118 { 1119 struct net *net; 1120 /* Examine the link attributes and figure out which 1121 * network namespace we are talking about. 1122 */ 1123 if (tb[IFLA_NET_NS_PID]) 1124 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1125 else if (tb[IFLA_NET_NS_FD]) 1126 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1127 else 1128 net = get_net(src_net); 1129 return net; 1130 } 1131 EXPORT_SYMBOL(rtnl_link_get_net); 1132 1133 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1134 { 1135 if (dev) { 1136 if (tb[IFLA_ADDRESS] && 1137 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1138 return -EINVAL; 1139 1140 if (tb[IFLA_BROADCAST] && 1141 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1142 return -EINVAL; 1143 } 1144 1145 if (tb[IFLA_AF_SPEC]) { 1146 struct nlattr *af; 1147 int rem, err; 1148 1149 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1150 const struct rtnl_af_ops *af_ops; 1151 1152 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1153 return -EAFNOSUPPORT; 1154 1155 if (!af_ops->set_link_af) 1156 return -EOPNOTSUPP; 1157 1158 if (af_ops->validate_link_af) { 1159 err = af_ops->validate_link_af(dev, af); 1160 if (err < 0) 1161 return err; 1162 } 1163 } 1164 } 1165 1166 return 0; 1167 } 1168 1169 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1170 { 1171 int rem, err = -EINVAL; 1172 struct nlattr *vf; 1173 const struct net_device_ops *ops = dev->netdev_ops; 1174 1175 nla_for_each_nested(vf, attr, rem) { 1176 switch (nla_type(vf)) { 1177 case IFLA_VF_MAC: { 1178 struct ifla_vf_mac *ivm; 1179 ivm = nla_data(vf); 1180 err = -EOPNOTSUPP; 1181 if (ops->ndo_set_vf_mac) 1182 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1183 ivm->mac); 1184 break; 1185 } 1186 case IFLA_VF_VLAN: { 1187 struct ifla_vf_vlan *ivv; 1188 ivv = nla_data(vf); 1189 err = -EOPNOTSUPP; 1190 if (ops->ndo_set_vf_vlan) 1191 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1192 ivv->vlan, 1193 ivv->qos); 1194 break; 1195 } 1196 case IFLA_VF_TX_RATE: { 1197 struct ifla_vf_tx_rate *ivt; 1198 ivt = nla_data(vf); 1199 err = -EOPNOTSUPP; 1200 if (ops->ndo_set_vf_tx_rate) 1201 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1202 ivt->rate); 1203 break; 1204 } 1205 default: 1206 err = -EINVAL; 1207 break; 1208 } 1209 if (err) 1210 break; 1211 } 1212 return err; 1213 } 1214 1215 static int do_set_master(struct net_device *dev, int ifindex) 1216 { 1217 struct net_device *master_dev; 1218 const struct net_device_ops *ops; 1219 int err; 1220 1221 if (dev->master) { 1222 if (dev->master->ifindex == ifindex) 1223 return 0; 1224 ops = dev->master->netdev_ops; 1225 if (ops->ndo_del_slave) { 1226 err = ops->ndo_del_slave(dev->master, dev); 1227 if (err) 1228 return err; 1229 } else { 1230 return -EOPNOTSUPP; 1231 } 1232 } 1233 1234 if (ifindex) { 1235 master_dev = __dev_get_by_index(dev_net(dev), ifindex); 1236 if (!master_dev) 1237 return -EINVAL; 1238 ops = master_dev->netdev_ops; 1239 if (ops->ndo_add_slave) { 1240 err = ops->ndo_add_slave(master_dev, dev); 1241 if (err) 1242 return err; 1243 } else { 1244 return -EOPNOTSUPP; 1245 } 1246 } 1247 return 0; 1248 } 1249 1250 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1251 struct nlattr **tb, char *ifname, int modified) 1252 { 1253 const struct net_device_ops *ops = dev->netdev_ops; 1254 int send_addr_notify = 0; 1255 int err; 1256 1257 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1258 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1259 if (IS_ERR(net)) { 1260 err = PTR_ERR(net); 1261 goto errout; 1262 } 1263 err = dev_change_net_namespace(dev, net, ifname); 1264 put_net(net); 1265 if (err) 1266 goto errout; 1267 modified = 1; 1268 } 1269 1270 if (tb[IFLA_MAP]) { 1271 struct rtnl_link_ifmap *u_map; 1272 struct ifmap k_map; 1273 1274 if (!ops->ndo_set_config) { 1275 err = -EOPNOTSUPP; 1276 goto errout; 1277 } 1278 1279 if (!netif_device_present(dev)) { 1280 err = -ENODEV; 1281 goto errout; 1282 } 1283 1284 u_map = nla_data(tb[IFLA_MAP]); 1285 k_map.mem_start = (unsigned long) u_map->mem_start; 1286 k_map.mem_end = (unsigned long) u_map->mem_end; 1287 k_map.base_addr = (unsigned short) u_map->base_addr; 1288 k_map.irq = (unsigned char) u_map->irq; 1289 k_map.dma = (unsigned char) u_map->dma; 1290 k_map.port = (unsigned char) u_map->port; 1291 1292 err = ops->ndo_set_config(dev, &k_map); 1293 if (err < 0) 1294 goto errout; 1295 1296 modified = 1; 1297 } 1298 1299 if (tb[IFLA_ADDRESS]) { 1300 struct sockaddr *sa; 1301 int len; 1302 1303 if (!ops->ndo_set_mac_address) { 1304 err = -EOPNOTSUPP; 1305 goto errout; 1306 } 1307 1308 if (!netif_device_present(dev)) { 1309 err = -ENODEV; 1310 goto errout; 1311 } 1312 1313 len = sizeof(sa_family_t) + dev->addr_len; 1314 sa = kmalloc(len, GFP_KERNEL); 1315 if (!sa) { 1316 err = -ENOMEM; 1317 goto errout; 1318 } 1319 sa->sa_family = dev->type; 1320 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1321 dev->addr_len); 1322 err = ops->ndo_set_mac_address(dev, sa); 1323 kfree(sa); 1324 if (err) 1325 goto errout; 1326 send_addr_notify = 1; 1327 modified = 1; 1328 } 1329 1330 if (tb[IFLA_MTU]) { 1331 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1332 if (err < 0) 1333 goto errout; 1334 modified = 1; 1335 } 1336 1337 if (tb[IFLA_GROUP]) { 1338 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1339 modified = 1; 1340 } 1341 1342 /* 1343 * Interface selected by interface index but interface 1344 * name provided implies that a name change has been 1345 * requested. 1346 */ 1347 if (ifm->ifi_index > 0 && ifname[0]) { 1348 err = dev_change_name(dev, ifname); 1349 if (err < 0) 1350 goto errout; 1351 modified = 1; 1352 } 1353 1354 if (tb[IFLA_IFALIAS]) { 1355 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1356 nla_len(tb[IFLA_IFALIAS])); 1357 if (err < 0) 1358 goto errout; 1359 modified = 1; 1360 } 1361 1362 if (tb[IFLA_BROADCAST]) { 1363 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1364 send_addr_notify = 1; 1365 } 1366 1367 if (ifm->ifi_flags || ifm->ifi_change) { 1368 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1369 if (err < 0) 1370 goto errout; 1371 } 1372 1373 if (tb[IFLA_MASTER]) { 1374 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1375 if (err) 1376 goto errout; 1377 modified = 1; 1378 } 1379 1380 if (tb[IFLA_TXQLEN]) 1381 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1382 1383 if (tb[IFLA_OPERSTATE]) 1384 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1385 1386 if (tb[IFLA_LINKMODE]) { 1387 write_lock_bh(&dev_base_lock); 1388 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1389 write_unlock_bh(&dev_base_lock); 1390 } 1391 1392 if (tb[IFLA_VFINFO_LIST]) { 1393 struct nlattr *attr; 1394 int rem; 1395 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1396 if (nla_type(attr) != IFLA_VF_INFO) { 1397 err = -EINVAL; 1398 goto errout; 1399 } 1400 err = do_setvfinfo(dev, attr); 1401 if (err < 0) 1402 goto errout; 1403 modified = 1; 1404 } 1405 } 1406 err = 0; 1407 1408 if (tb[IFLA_VF_PORTS]) { 1409 struct nlattr *port[IFLA_PORT_MAX+1]; 1410 struct nlattr *attr; 1411 int vf; 1412 int rem; 1413 1414 err = -EOPNOTSUPP; 1415 if (!ops->ndo_set_vf_port) 1416 goto errout; 1417 1418 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1419 if (nla_type(attr) != IFLA_VF_PORT) 1420 continue; 1421 err = nla_parse_nested(port, IFLA_PORT_MAX, 1422 attr, ifla_port_policy); 1423 if (err < 0) 1424 goto errout; 1425 if (!port[IFLA_PORT_VF]) { 1426 err = -EOPNOTSUPP; 1427 goto errout; 1428 } 1429 vf = nla_get_u32(port[IFLA_PORT_VF]); 1430 err = ops->ndo_set_vf_port(dev, vf, port); 1431 if (err < 0) 1432 goto errout; 1433 modified = 1; 1434 } 1435 } 1436 err = 0; 1437 1438 if (tb[IFLA_PORT_SELF]) { 1439 struct nlattr *port[IFLA_PORT_MAX+1]; 1440 1441 err = nla_parse_nested(port, IFLA_PORT_MAX, 1442 tb[IFLA_PORT_SELF], ifla_port_policy); 1443 if (err < 0) 1444 goto errout; 1445 1446 err = -EOPNOTSUPP; 1447 if (ops->ndo_set_vf_port) 1448 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1449 if (err < 0) 1450 goto errout; 1451 modified = 1; 1452 } 1453 1454 if (tb[IFLA_AF_SPEC]) { 1455 struct nlattr *af; 1456 int rem; 1457 1458 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1459 const struct rtnl_af_ops *af_ops; 1460 1461 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1462 BUG(); 1463 1464 err = af_ops->set_link_af(dev, af); 1465 if (err < 0) 1466 goto errout; 1467 1468 modified = 1; 1469 } 1470 } 1471 err = 0; 1472 1473 errout: 1474 if (err < 0 && modified && net_ratelimit()) 1475 printk(KERN_WARNING "A link change request failed with " 1476 "some changes committed already. Interface %s may " 1477 "have been left with an inconsistent configuration, " 1478 "please check.\n", dev->name); 1479 1480 if (send_addr_notify) 1481 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1482 return err; 1483 } 1484 1485 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1486 { 1487 struct net *net = sock_net(skb->sk); 1488 struct ifinfomsg *ifm; 1489 struct net_device *dev; 1490 int err; 1491 struct nlattr *tb[IFLA_MAX+1]; 1492 char ifname[IFNAMSIZ]; 1493 1494 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1495 if (err < 0) 1496 goto errout; 1497 1498 if (tb[IFLA_IFNAME]) 1499 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1500 else 1501 ifname[0] = '\0'; 1502 1503 err = -EINVAL; 1504 ifm = nlmsg_data(nlh); 1505 if (ifm->ifi_index > 0) 1506 dev = __dev_get_by_index(net, ifm->ifi_index); 1507 else if (tb[IFLA_IFNAME]) 1508 dev = __dev_get_by_name(net, ifname); 1509 else 1510 goto errout; 1511 1512 if (dev == NULL) { 1513 err = -ENODEV; 1514 goto errout; 1515 } 1516 1517 err = validate_linkmsg(dev, tb); 1518 if (err < 0) 1519 goto errout; 1520 1521 err = do_setlink(dev, ifm, tb, ifname, 0); 1522 errout: 1523 return err; 1524 } 1525 1526 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1527 { 1528 struct net *net = sock_net(skb->sk); 1529 const struct rtnl_link_ops *ops; 1530 struct net_device *dev; 1531 struct ifinfomsg *ifm; 1532 char ifname[IFNAMSIZ]; 1533 struct nlattr *tb[IFLA_MAX+1]; 1534 int err; 1535 LIST_HEAD(list_kill); 1536 1537 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1538 if (err < 0) 1539 return err; 1540 1541 if (tb[IFLA_IFNAME]) 1542 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1543 1544 ifm = nlmsg_data(nlh); 1545 if (ifm->ifi_index > 0) 1546 dev = __dev_get_by_index(net, ifm->ifi_index); 1547 else if (tb[IFLA_IFNAME]) 1548 dev = __dev_get_by_name(net, ifname); 1549 else 1550 return -EINVAL; 1551 1552 if (!dev) 1553 return -ENODEV; 1554 1555 ops = dev->rtnl_link_ops; 1556 if (!ops) 1557 return -EOPNOTSUPP; 1558 1559 ops->dellink(dev, &list_kill); 1560 unregister_netdevice_many(&list_kill); 1561 list_del(&list_kill); 1562 return 0; 1563 } 1564 1565 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1566 { 1567 unsigned int old_flags; 1568 int err; 1569 1570 old_flags = dev->flags; 1571 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1572 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1573 if (err < 0) 1574 return err; 1575 } 1576 1577 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1578 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1579 1580 __dev_notify_flags(dev, old_flags); 1581 return 0; 1582 } 1583 EXPORT_SYMBOL(rtnl_configure_link); 1584 1585 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1586 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1587 { 1588 int err; 1589 struct net_device *dev; 1590 unsigned int num_queues = 1; 1591 unsigned int real_num_queues = 1; 1592 1593 if (ops->get_tx_queues) { 1594 err = ops->get_tx_queues(src_net, tb, &num_queues, 1595 &real_num_queues); 1596 if (err) 1597 goto err; 1598 } 1599 err = -ENOMEM; 1600 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1601 if (!dev) 1602 goto err; 1603 1604 dev_net_set(dev, net); 1605 dev->rtnl_link_ops = ops; 1606 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1607 dev->real_num_tx_queues = real_num_queues; 1608 1609 if (tb[IFLA_MTU]) 1610 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1611 if (tb[IFLA_ADDRESS]) 1612 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1613 nla_len(tb[IFLA_ADDRESS])); 1614 if (tb[IFLA_BROADCAST]) 1615 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1616 nla_len(tb[IFLA_BROADCAST])); 1617 if (tb[IFLA_TXQLEN]) 1618 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1619 if (tb[IFLA_OPERSTATE]) 1620 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1621 if (tb[IFLA_LINKMODE]) 1622 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1623 if (tb[IFLA_GROUP]) 1624 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1625 1626 return dev; 1627 1628 err: 1629 return ERR_PTR(err); 1630 } 1631 EXPORT_SYMBOL(rtnl_create_link); 1632 1633 static int rtnl_group_changelink(struct net *net, int group, 1634 struct ifinfomsg *ifm, 1635 struct nlattr **tb) 1636 { 1637 struct net_device *dev; 1638 int err; 1639 1640 for_each_netdev(net, dev) { 1641 if (dev->group == group) { 1642 err = do_setlink(dev, ifm, tb, NULL, 0); 1643 if (err < 0) 1644 return err; 1645 } 1646 } 1647 1648 return 0; 1649 } 1650 1651 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1652 { 1653 struct net *net = sock_net(skb->sk); 1654 const struct rtnl_link_ops *ops; 1655 struct net_device *dev; 1656 struct ifinfomsg *ifm; 1657 char kind[MODULE_NAME_LEN]; 1658 char ifname[IFNAMSIZ]; 1659 struct nlattr *tb[IFLA_MAX+1]; 1660 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1661 int err; 1662 1663 #ifdef CONFIG_MODULES 1664 replay: 1665 #endif 1666 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1667 if (err < 0) 1668 return err; 1669 1670 if (tb[IFLA_IFNAME]) 1671 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1672 else 1673 ifname[0] = '\0'; 1674 1675 ifm = nlmsg_data(nlh); 1676 if (ifm->ifi_index > 0) 1677 dev = __dev_get_by_index(net, ifm->ifi_index); 1678 else { 1679 if (ifname[0]) 1680 dev = __dev_get_by_name(net, ifname); 1681 else 1682 dev = NULL; 1683 } 1684 1685 err = validate_linkmsg(dev, tb); 1686 if (err < 0) 1687 return err; 1688 1689 if (tb[IFLA_LINKINFO]) { 1690 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1691 tb[IFLA_LINKINFO], ifla_info_policy); 1692 if (err < 0) 1693 return err; 1694 } else 1695 memset(linkinfo, 0, sizeof(linkinfo)); 1696 1697 if (linkinfo[IFLA_INFO_KIND]) { 1698 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1699 ops = rtnl_link_ops_get(kind); 1700 } else { 1701 kind[0] = '\0'; 1702 ops = NULL; 1703 } 1704 1705 if (1) { 1706 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1707 struct net *dest_net; 1708 1709 if (ops) { 1710 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1711 err = nla_parse_nested(attr, ops->maxtype, 1712 linkinfo[IFLA_INFO_DATA], 1713 ops->policy); 1714 if (err < 0) 1715 return err; 1716 data = attr; 1717 } 1718 if (ops->validate) { 1719 err = ops->validate(tb, data); 1720 if (err < 0) 1721 return err; 1722 } 1723 } 1724 1725 if (dev) { 1726 int modified = 0; 1727 1728 if (nlh->nlmsg_flags & NLM_F_EXCL) 1729 return -EEXIST; 1730 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1731 return -EOPNOTSUPP; 1732 1733 if (linkinfo[IFLA_INFO_DATA]) { 1734 if (!ops || ops != dev->rtnl_link_ops || 1735 !ops->changelink) 1736 return -EOPNOTSUPP; 1737 1738 err = ops->changelink(dev, tb, data); 1739 if (err < 0) 1740 return err; 1741 modified = 1; 1742 } 1743 1744 return do_setlink(dev, ifm, tb, ifname, modified); 1745 } 1746 1747 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1748 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1749 return rtnl_group_changelink(net, 1750 nla_get_u32(tb[IFLA_GROUP]), 1751 ifm, tb); 1752 return -ENODEV; 1753 } 1754 1755 if (ifm->ifi_index) 1756 return -EOPNOTSUPP; 1757 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1758 return -EOPNOTSUPP; 1759 1760 if (!ops) { 1761 #ifdef CONFIG_MODULES 1762 if (kind[0]) { 1763 __rtnl_unlock(); 1764 request_module("rtnl-link-%s", kind); 1765 rtnl_lock(); 1766 ops = rtnl_link_ops_get(kind); 1767 if (ops) 1768 goto replay; 1769 } 1770 #endif 1771 return -EOPNOTSUPP; 1772 } 1773 1774 if (!ifname[0]) 1775 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1776 1777 dest_net = rtnl_link_get_net(net, tb); 1778 if (IS_ERR(dest_net)) 1779 return PTR_ERR(dest_net); 1780 1781 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1782 1783 if (IS_ERR(dev)) 1784 err = PTR_ERR(dev); 1785 else if (ops->newlink) 1786 err = ops->newlink(net, dev, tb, data); 1787 else 1788 err = register_netdevice(dev); 1789 1790 if (err < 0 && !IS_ERR(dev)) 1791 free_netdev(dev); 1792 if (err < 0) 1793 goto out; 1794 1795 err = rtnl_configure_link(dev, ifm); 1796 if (err < 0) 1797 unregister_netdevice(dev); 1798 out: 1799 put_net(dest_net); 1800 return err; 1801 } 1802 } 1803 1804 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1805 { 1806 struct net *net = sock_net(skb->sk); 1807 struct ifinfomsg *ifm; 1808 char ifname[IFNAMSIZ]; 1809 struct nlattr *tb[IFLA_MAX+1]; 1810 struct net_device *dev = NULL; 1811 struct sk_buff *nskb; 1812 int err; 1813 1814 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1815 if (err < 0) 1816 return err; 1817 1818 if (tb[IFLA_IFNAME]) 1819 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1820 1821 ifm = nlmsg_data(nlh); 1822 if (ifm->ifi_index > 0) 1823 dev = __dev_get_by_index(net, ifm->ifi_index); 1824 else if (tb[IFLA_IFNAME]) 1825 dev = __dev_get_by_name(net, ifname); 1826 else 1827 return -EINVAL; 1828 1829 if (dev == NULL) 1830 return -ENODEV; 1831 1832 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1833 if (nskb == NULL) 1834 return -ENOBUFS; 1835 1836 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1837 nlh->nlmsg_seq, 0, 0); 1838 if (err < 0) { 1839 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1840 WARN_ON(err == -EMSGSIZE); 1841 kfree_skb(nskb); 1842 } else 1843 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1844 1845 return err; 1846 } 1847 1848 static u16 rtnl_calcit(struct sk_buff *skb) 1849 { 1850 return min_ifinfo_dump_size; 1851 } 1852 1853 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1854 { 1855 int idx; 1856 int s_idx = cb->family; 1857 1858 if (s_idx == 0) 1859 s_idx = 1; 1860 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1861 int type = cb->nlh->nlmsg_type-RTM_BASE; 1862 if (idx < s_idx || idx == PF_PACKET) 1863 continue; 1864 if (rtnl_msg_handlers[idx] == NULL || 1865 rtnl_msg_handlers[idx][type].dumpit == NULL) 1866 continue; 1867 if (idx > s_idx) 1868 memset(&cb->args[0], 0, sizeof(cb->args)); 1869 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1870 break; 1871 } 1872 cb->family = idx; 1873 1874 return skb->len; 1875 } 1876 1877 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1878 { 1879 struct net *net = dev_net(dev); 1880 struct sk_buff *skb; 1881 int err = -ENOBUFS; 1882 size_t if_info_size; 1883 1884 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev)), GFP_KERNEL); 1885 if (skb == NULL) 1886 goto errout; 1887 1888 min_ifinfo_dump_size = max_t(u16, if_info_size, min_ifinfo_dump_size); 1889 1890 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1891 if (err < 0) { 1892 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1893 WARN_ON(err == -EMSGSIZE); 1894 kfree_skb(skb); 1895 goto errout; 1896 } 1897 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1898 return; 1899 errout: 1900 if (err < 0) 1901 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1902 } 1903 1904 /* Protected by RTNL sempahore. */ 1905 static struct rtattr **rta_buf; 1906 static int rtattr_max; 1907 1908 /* Process one rtnetlink message. */ 1909 1910 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1911 { 1912 struct net *net = sock_net(skb->sk); 1913 rtnl_doit_func doit; 1914 int sz_idx, kind; 1915 int min_len; 1916 int family; 1917 int type; 1918 int err; 1919 1920 type = nlh->nlmsg_type; 1921 if (type > RTM_MAX) 1922 return -EOPNOTSUPP; 1923 1924 type -= RTM_BASE; 1925 1926 /* All the messages must have at least 1 byte length */ 1927 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1928 return 0; 1929 1930 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1931 sz_idx = type>>2; 1932 kind = type&3; 1933 1934 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1935 return -EPERM; 1936 1937 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1938 struct sock *rtnl; 1939 rtnl_dumpit_func dumpit; 1940 rtnl_calcit_func calcit; 1941 u16 min_dump_alloc = 0; 1942 1943 dumpit = rtnl_get_dumpit(family, type); 1944 if (dumpit == NULL) 1945 return -EOPNOTSUPP; 1946 calcit = rtnl_get_calcit(family, type); 1947 if (calcit) 1948 min_dump_alloc = calcit(skb); 1949 1950 __rtnl_unlock(); 1951 rtnl = net->rtnl; 1952 err = netlink_dump_start(rtnl, skb, nlh, dumpit, 1953 NULL, min_dump_alloc); 1954 rtnl_lock(); 1955 return err; 1956 } 1957 1958 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1959 1960 min_len = rtm_min[sz_idx]; 1961 if (nlh->nlmsg_len < min_len) 1962 return -EINVAL; 1963 1964 if (nlh->nlmsg_len > min_len) { 1965 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1966 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1967 1968 while (RTA_OK(attr, attrlen)) { 1969 unsigned flavor = attr->rta_type; 1970 if (flavor) { 1971 if (flavor > rta_max[sz_idx]) 1972 return -EINVAL; 1973 rta_buf[flavor-1] = attr; 1974 } 1975 attr = RTA_NEXT(attr, attrlen); 1976 } 1977 } 1978 1979 doit = rtnl_get_doit(family, type); 1980 if (doit == NULL) 1981 return -EOPNOTSUPP; 1982 1983 return doit(skb, nlh, (void *)&rta_buf[0]); 1984 } 1985 1986 static void rtnetlink_rcv(struct sk_buff *skb) 1987 { 1988 rtnl_lock(); 1989 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1990 rtnl_unlock(); 1991 } 1992 1993 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1994 { 1995 struct net_device *dev = ptr; 1996 1997 switch (event) { 1998 case NETDEV_UP: 1999 case NETDEV_DOWN: 2000 case NETDEV_PRE_UP: 2001 case NETDEV_POST_INIT: 2002 case NETDEV_REGISTER: 2003 case NETDEV_CHANGE: 2004 case NETDEV_PRE_TYPE_CHANGE: 2005 case NETDEV_GOING_DOWN: 2006 case NETDEV_UNREGISTER: 2007 case NETDEV_UNREGISTER_BATCH: 2008 case NETDEV_RELEASE: 2009 case NETDEV_JOIN: 2010 break; 2011 default: 2012 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2013 break; 2014 } 2015 return NOTIFY_DONE; 2016 } 2017 2018 static struct notifier_block rtnetlink_dev_notifier = { 2019 .notifier_call = rtnetlink_event, 2020 }; 2021 2022 2023 static int __net_init rtnetlink_net_init(struct net *net) 2024 { 2025 struct sock *sk; 2026 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 2027 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 2028 if (!sk) 2029 return -ENOMEM; 2030 net->rtnl = sk; 2031 return 0; 2032 } 2033 2034 static void __net_exit rtnetlink_net_exit(struct net *net) 2035 { 2036 netlink_kernel_release(net->rtnl); 2037 net->rtnl = NULL; 2038 } 2039 2040 static struct pernet_operations rtnetlink_net_ops = { 2041 .init = rtnetlink_net_init, 2042 .exit = rtnetlink_net_exit, 2043 }; 2044 2045 void __init rtnetlink_init(void) 2046 { 2047 int i; 2048 2049 rtattr_max = 0; 2050 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 2051 if (rta_max[i] > rtattr_max) 2052 rtattr_max = rta_max[i]; 2053 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 2054 if (!rta_buf) 2055 panic("rtnetlink_init: cannot allocate rta_buf\n"); 2056 2057 if (register_pernet_subsys(&rtnetlink_net_ops)) 2058 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2059 2060 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 2061 register_netdevice_notifier(&rtnetlink_dev_notifier); 2062 2063 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2064 rtnl_dump_ifinfo, rtnl_calcit); 2065 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2066 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2067 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2068 2069 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2070 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2071 } 2072 2073