rtnetlink.c revision d83b060360485454fcd6870340ec01d6f96f2295
1/* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19#include <linux/errno.h> 20#include <linux/module.h> 21#include <linux/types.h> 22#include <linux/socket.h> 23#include <linux/kernel.h> 24#include <linux/timer.h> 25#include <linux/string.h> 26#include <linux/sockios.h> 27#include <linux/net.h> 28#include <linux/fcntl.h> 29#include <linux/mm.h> 30#include <linux/slab.h> 31#include <linux/interrupt.h> 32#include <linux/capability.h> 33#include <linux/skbuff.h> 34#include <linux/init.h> 35#include <linux/security.h> 36#include <linux/mutex.h> 37#include <linux/if_addr.h> 38#include <linux/if_bridge.h> 39#include <linux/pci.h> 40#include <linux/etherdevice.h> 41 42#include <asm/uaccess.h> 43 44#include <linux/inet.h> 45#include <linux/netdevice.h> 46#include <net/ip.h> 47#include <net/protocol.h> 48#include <net/arp.h> 49#include <net/route.h> 50#include <net/udp.h> 51#include <net/sock.h> 52#include <net/pkt_sched.h> 53#include <net/fib_rules.h> 54#include <net/rtnetlink.h> 55#include <net/net_namespace.h> 56 57struct rtnl_link { 58 rtnl_doit_func doit; 59 rtnl_dumpit_func dumpit; 60 rtnl_calcit_func calcit; 61}; 62 63static DEFINE_MUTEX(rtnl_mutex); 64 65void rtnl_lock(void) 66{ 67 mutex_lock(&rtnl_mutex); 68} 69EXPORT_SYMBOL(rtnl_lock); 70 71void __rtnl_unlock(void) 72{ 73 mutex_unlock(&rtnl_mutex); 74} 75 76void rtnl_unlock(void) 77{ 78 /* This fellow will unlock it for us. */ 79 netdev_run_todo(); 80} 81EXPORT_SYMBOL(rtnl_unlock); 82 83int rtnl_trylock(void) 84{ 85 return mutex_trylock(&rtnl_mutex); 86} 87EXPORT_SYMBOL(rtnl_trylock); 88 89int rtnl_is_locked(void) 90{ 91 return mutex_is_locked(&rtnl_mutex); 92} 93EXPORT_SYMBOL(rtnl_is_locked); 94 95#ifdef CONFIG_PROVE_LOCKING 96int lockdep_rtnl_is_held(void) 97{ 98 return lockdep_is_held(&rtnl_mutex); 99} 100EXPORT_SYMBOL(lockdep_rtnl_is_held); 101#endif /* #ifdef CONFIG_PROVE_LOCKING */ 102 103static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 104 105static 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 119static 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 134static 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 149static 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 */ 182int __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} 212EXPORT_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 */ 223void 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} 232EXPORT_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 */ 241int 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} 256EXPORT_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 */ 265void 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} 272EXPORT_SYMBOL_GPL(rtnl_unregister_all); 273 274static LIST_HEAD(link_ops); 275 276static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 277{ 278 const struct rtnl_link_ops *ops; 279 280 list_for_each_entry(ops, &link_ops, list) { 281 if (!strcmp(ops->kind, kind)) 282 return ops; 283 } 284 return NULL; 285} 286 287/** 288 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 289 * @ops: struct rtnl_link_ops * to register 290 * 291 * The caller must hold the rtnl_mutex. This function should be used 292 * by drivers that create devices during module initialization. It 293 * must be called before registering the devices. 294 * 295 * Returns 0 on success or a negative error code. 296 */ 297int __rtnl_link_register(struct rtnl_link_ops *ops) 298{ 299 if (rtnl_link_ops_get(ops->kind)) 300 return -EEXIST; 301 302 if (!ops->dellink) 303 ops->dellink = unregister_netdevice_queue; 304 305 list_add_tail(&ops->list, &link_ops); 306 return 0; 307} 308EXPORT_SYMBOL_GPL(__rtnl_link_register); 309 310/** 311 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 312 * @ops: struct rtnl_link_ops * to register 313 * 314 * Returns 0 on success or a negative error code. 315 */ 316int rtnl_link_register(struct rtnl_link_ops *ops) 317{ 318 int err; 319 320 rtnl_lock(); 321 err = __rtnl_link_register(ops); 322 rtnl_unlock(); 323 return err; 324} 325EXPORT_SYMBOL_GPL(rtnl_link_register); 326 327static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 328{ 329 struct net_device *dev; 330 LIST_HEAD(list_kill); 331 332 for_each_netdev(net, dev) { 333 if (dev->rtnl_link_ops == ops) 334 ops->dellink(dev, &list_kill); 335 } 336 unregister_netdevice_many(&list_kill); 337} 338 339/** 340 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 341 * @ops: struct rtnl_link_ops * to unregister 342 * 343 * The caller must hold the rtnl_mutex. 344 */ 345void __rtnl_link_unregister(struct rtnl_link_ops *ops) 346{ 347 struct net *net; 348 349 for_each_net(net) { 350 __rtnl_kill_links(net, ops); 351 } 352 list_del(&ops->list); 353} 354EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 355 356/** 357 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 358 * @ops: struct rtnl_link_ops * to unregister 359 */ 360void rtnl_link_unregister(struct rtnl_link_ops *ops) 361{ 362 rtnl_lock(); 363 __rtnl_link_unregister(ops); 364 rtnl_unlock(); 365} 366EXPORT_SYMBOL_GPL(rtnl_link_unregister); 367 368static size_t rtnl_link_get_size(const struct net_device *dev) 369{ 370 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 371 size_t size; 372 373 if (!ops) 374 return 0; 375 376 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 377 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 378 379 if (ops->get_size) 380 /* IFLA_INFO_DATA + nested data */ 381 size += nla_total_size(sizeof(struct nlattr)) + 382 ops->get_size(dev); 383 384 if (ops->get_xstats_size) 385 /* IFLA_INFO_XSTATS */ 386 size += nla_total_size(ops->get_xstats_size(dev)); 387 388 return size; 389} 390 391static LIST_HEAD(rtnl_af_ops); 392 393static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 394{ 395 const struct rtnl_af_ops *ops; 396 397 list_for_each_entry(ops, &rtnl_af_ops, list) { 398 if (ops->family == family) 399 return ops; 400 } 401 402 return NULL; 403} 404 405/** 406 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink. 407 * @ops: struct rtnl_af_ops * to register 408 * 409 * The caller must hold the rtnl_mutex. 410 * 411 * Returns 0 on success or a negative error code. 412 */ 413int __rtnl_af_register(struct rtnl_af_ops *ops) 414{ 415 list_add_tail(&ops->list, &rtnl_af_ops); 416 return 0; 417} 418EXPORT_SYMBOL_GPL(__rtnl_af_register); 419 420/** 421 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 422 * @ops: struct rtnl_af_ops * to register 423 * 424 * Returns 0 on success or a negative error code. 425 */ 426int rtnl_af_register(struct rtnl_af_ops *ops) 427{ 428 int err; 429 430 rtnl_lock(); 431 err = __rtnl_af_register(ops); 432 rtnl_unlock(); 433 return err; 434} 435EXPORT_SYMBOL_GPL(rtnl_af_register); 436 437/** 438 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 439 * @ops: struct rtnl_af_ops * to unregister 440 * 441 * The caller must hold the rtnl_mutex. 442 */ 443void __rtnl_af_unregister(struct rtnl_af_ops *ops) 444{ 445 list_del(&ops->list); 446} 447EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 448 449/** 450 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 451 * @ops: struct rtnl_af_ops * to unregister 452 */ 453void rtnl_af_unregister(struct rtnl_af_ops *ops) 454{ 455 rtnl_lock(); 456 __rtnl_af_unregister(ops); 457 rtnl_unlock(); 458} 459EXPORT_SYMBOL_GPL(rtnl_af_unregister); 460 461static size_t rtnl_link_get_af_size(const struct net_device *dev) 462{ 463 struct rtnl_af_ops *af_ops; 464 size_t size; 465 466 /* IFLA_AF_SPEC */ 467 size = nla_total_size(sizeof(struct nlattr)); 468 469 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 470 if (af_ops->get_link_af_size) { 471 /* AF_* + nested data */ 472 size += nla_total_size(sizeof(struct nlattr)) + 473 af_ops->get_link_af_size(dev); 474 } 475 } 476 477 return size; 478} 479 480static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 481{ 482 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 483 struct nlattr *linkinfo, *data; 484 int err = -EMSGSIZE; 485 486 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 487 if (linkinfo == NULL) 488 goto out; 489 490 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 491 goto err_cancel_link; 492 if (ops->fill_xstats) { 493 err = ops->fill_xstats(skb, dev); 494 if (err < 0) 495 goto err_cancel_link; 496 } 497 if (ops->fill_info) { 498 data = nla_nest_start(skb, IFLA_INFO_DATA); 499 if (data == NULL) 500 goto err_cancel_link; 501 err = ops->fill_info(skb, dev); 502 if (err < 0) 503 goto err_cancel_data; 504 nla_nest_end(skb, data); 505 } 506 507 nla_nest_end(skb, linkinfo); 508 return 0; 509 510err_cancel_data: 511 nla_nest_cancel(skb, data); 512err_cancel_link: 513 nla_nest_cancel(skb, linkinfo); 514out: 515 return err; 516} 517 518static const int rtm_min[RTM_NR_FAMILIES] = 519{ 520 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 521 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 522 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 523 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 524 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 525 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 526 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 527 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 528 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 529 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 530}; 531 532static const int rta_max[RTM_NR_FAMILIES] = 533{ 534 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 535 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 536 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 537 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 538 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 539 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 540 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 541 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 542}; 543 544void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 545{ 546 struct rtattr *rta; 547 int size = RTA_LENGTH(attrlen); 548 549 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); 550 rta->rta_type = attrtype; 551 rta->rta_len = size; 552 memcpy(RTA_DATA(rta), data, attrlen); 553 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 554} 555EXPORT_SYMBOL(__rta_fill); 556 557int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 558{ 559 struct sock *rtnl = net->rtnl; 560 int err = 0; 561 562 NETLINK_CB(skb).dst_group = group; 563 if (echo) 564 atomic_inc(&skb->users); 565 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 566 if (echo) 567 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 568 return err; 569} 570 571int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 572{ 573 struct sock *rtnl = net->rtnl; 574 575 return nlmsg_unicast(rtnl, skb, pid); 576} 577EXPORT_SYMBOL(rtnl_unicast); 578 579void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 580 struct nlmsghdr *nlh, gfp_t flags) 581{ 582 struct sock *rtnl = net->rtnl; 583 int report = 0; 584 585 if (nlh) 586 report = nlmsg_report(nlh); 587 588 nlmsg_notify(rtnl, skb, pid, group, report, flags); 589} 590EXPORT_SYMBOL(rtnl_notify); 591 592void rtnl_set_sk_err(struct net *net, u32 group, int error) 593{ 594 struct sock *rtnl = net->rtnl; 595 596 netlink_set_err(rtnl, 0, group, error); 597} 598EXPORT_SYMBOL(rtnl_set_sk_err); 599 600int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 601{ 602 struct nlattr *mx; 603 int i, valid = 0; 604 605 mx = nla_nest_start(skb, RTA_METRICS); 606 if (mx == NULL) 607 return -ENOBUFS; 608 609 for (i = 0; i < RTAX_MAX; i++) { 610 if (metrics[i]) { 611 valid++; 612 if (nla_put_u32(skb, i+1, metrics[i])) 613 goto nla_put_failure; 614 } 615 } 616 617 if (!valid) { 618 nla_nest_cancel(skb, mx); 619 return 0; 620 } 621 622 return nla_nest_end(skb, mx); 623 624nla_put_failure: 625 nla_nest_cancel(skb, mx); 626 return -EMSGSIZE; 627} 628EXPORT_SYMBOL(rtnetlink_put_metrics); 629 630int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 631 u32 ts, u32 tsage, long expires, u32 error) 632{ 633 struct rta_cacheinfo ci = { 634 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 635 .rta_used = dst->__use, 636 .rta_clntref = atomic_read(&(dst->__refcnt)), 637 .rta_error = error, 638 .rta_id = id, 639 .rta_ts = ts, 640 .rta_tsage = tsage, 641 }; 642 643 if (expires) 644 ci.rta_expires = jiffies_to_clock_t(expires); 645 646 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 647} 648EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 649 650static void set_operstate(struct net_device *dev, unsigned char transition) 651{ 652 unsigned char operstate = dev->operstate; 653 654 switch (transition) { 655 case IF_OPER_UP: 656 if ((operstate == IF_OPER_DORMANT || 657 operstate == IF_OPER_UNKNOWN) && 658 !netif_dormant(dev)) 659 operstate = IF_OPER_UP; 660 break; 661 662 case IF_OPER_DORMANT: 663 if (operstate == IF_OPER_UP || 664 operstate == IF_OPER_UNKNOWN) 665 operstate = IF_OPER_DORMANT; 666 break; 667 } 668 669 if (dev->operstate != operstate) { 670 write_lock_bh(&dev_base_lock); 671 dev->operstate = operstate; 672 write_unlock_bh(&dev_base_lock); 673 netdev_state_change(dev); 674 } 675} 676 677static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 678 const struct ifinfomsg *ifm) 679{ 680 unsigned int flags = ifm->ifi_flags; 681 682 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 683 if (ifm->ifi_change) 684 flags = (flags & ifm->ifi_change) | 685 (dev->flags & ~ifm->ifi_change); 686 687 return flags; 688} 689 690static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 691 const struct rtnl_link_stats64 *b) 692{ 693 a->rx_packets = b->rx_packets; 694 a->tx_packets = b->tx_packets; 695 a->rx_bytes = b->rx_bytes; 696 a->tx_bytes = b->tx_bytes; 697 a->rx_errors = b->rx_errors; 698 a->tx_errors = b->tx_errors; 699 a->rx_dropped = b->rx_dropped; 700 a->tx_dropped = b->tx_dropped; 701 702 a->multicast = b->multicast; 703 a->collisions = b->collisions; 704 705 a->rx_length_errors = b->rx_length_errors; 706 a->rx_over_errors = b->rx_over_errors; 707 a->rx_crc_errors = b->rx_crc_errors; 708 a->rx_frame_errors = b->rx_frame_errors; 709 a->rx_fifo_errors = b->rx_fifo_errors; 710 a->rx_missed_errors = b->rx_missed_errors; 711 712 a->tx_aborted_errors = b->tx_aborted_errors; 713 a->tx_carrier_errors = b->tx_carrier_errors; 714 a->tx_fifo_errors = b->tx_fifo_errors; 715 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 716 a->tx_window_errors = b->tx_window_errors; 717 718 a->rx_compressed = b->rx_compressed; 719 a->tx_compressed = b->tx_compressed; 720} 721 722static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 723{ 724 memcpy(v, b, sizeof(*b)); 725} 726 727/* All VF info */ 728static inline int rtnl_vfinfo_size(const struct net_device *dev, 729 u32 ext_filter_mask) 730{ 731 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 732 (ext_filter_mask & RTEXT_FILTER_VF)) { 733 int num_vfs = dev_num_vf(dev->dev.parent); 734 size_t size = nla_total_size(sizeof(struct nlattr)); 735 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 736 size += num_vfs * 737 (nla_total_size(sizeof(struct ifla_vf_mac)) + 738 nla_total_size(sizeof(struct ifla_vf_vlan)) + 739 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 740 nla_total_size(sizeof(struct ifla_vf_spoofchk))); 741 return size; 742 } else 743 return 0; 744} 745 746static size_t rtnl_port_size(const struct net_device *dev) 747{ 748 size_t port_size = nla_total_size(4) /* PORT_VF */ 749 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 750 + nla_total_size(sizeof(struct ifla_port_vsi)) 751 /* PORT_VSI_TYPE */ 752 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 753 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 754 + nla_total_size(1) /* PROT_VDP_REQUEST */ 755 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 756 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 757 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 758 + port_size; 759 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 760 + port_size; 761 762 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 763 return 0; 764 if (dev_num_vf(dev->dev.parent)) 765 return port_self_size + vf_ports_size + 766 vf_port_size * dev_num_vf(dev->dev.parent); 767 else 768 return port_self_size; 769} 770 771static noinline size_t if_nlmsg_size(const struct net_device *dev, 772 u32 ext_filter_mask) 773{ 774 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 775 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 776 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 777 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 778 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 779 + nla_total_size(sizeof(struct rtnl_link_stats)) 780 + nla_total_size(sizeof(struct rtnl_link_stats64)) 781 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 782 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 783 + nla_total_size(4) /* IFLA_TXQLEN */ 784 + nla_total_size(4) /* IFLA_WEIGHT */ 785 + nla_total_size(4) /* IFLA_MTU */ 786 + nla_total_size(4) /* IFLA_LINK */ 787 + nla_total_size(4) /* IFLA_MASTER */ 788 + nla_total_size(4) /* IFLA_PROMISCUITY */ 789 + nla_total_size(1) /* IFLA_OPERSTATE */ 790 + nla_total_size(1) /* IFLA_LINKMODE */ 791 + nla_total_size(ext_filter_mask 792 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 793 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 794 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 795 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 796 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 797} 798 799static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 800{ 801 struct nlattr *vf_ports; 802 struct nlattr *vf_port; 803 int vf; 804 int err; 805 806 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 807 if (!vf_ports) 808 return -EMSGSIZE; 809 810 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 811 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 812 if (!vf_port) 813 goto nla_put_failure; 814 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 815 goto nla_put_failure; 816 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 817 if (err == -EMSGSIZE) 818 goto nla_put_failure; 819 if (err) { 820 nla_nest_cancel(skb, vf_port); 821 continue; 822 } 823 nla_nest_end(skb, vf_port); 824 } 825 826 nla_nest_end(skb, vf_ports); 827 828 return 0; 829 830nla_put_failure: 831 nla_nest_cancel(skb, vf_ports); 832 return -EMSGSIZE; 833} 834 835static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 836{ 837 struct nlattr *port_self; 838 int err; 839 840 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 841 if (!port_self) 842 return -EMSGSIZE; 843 844 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 845 if (err) { 846 nla_nest_cancel(skb, port_self); 847 return (err == -EMSGSIZE) ? err : 0; 848 } 849 850 nla_nest_end(skb, port_self); 851 852 return 0; 853} 854 855static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 856{ 857 int err; 858 859 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 860 return 0; 861 862 err = rtnl_port_self_fill(skb, dev); 863 if (err) 864 return err; 865 866 if (dev_num_vf(dev->dev.parent)) { 867 err = rtnl_vf_ports_fill(skb, dev); 868 if (err) 869 return err; 870 } 871 872 return 0; 873} 874 875static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 876 int type, u32 pid, u32 seq, u32 change, 877 unsigned int flags, u32 ext_filter_mask) 878{ 879 struct ifinfomsg *ifm; 880 struct nlmsghdr *nlh; 881 struct rtnl_link_stats64 temp; 882 const struct rtnl_link_stats64 *stats; 883 struct nlattr *attr, *af_spec; 884 struct rtnl_af_ops *af_ops; 885 886 ASSERT_RTNL(); 887 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 888 if (nlh == NULL) 889 return -EMSGSIZE; 890 891 ifm = nlmsg_data(nlh); 892 ifm->ifi_family = AF_UNSPEC; 893 ifm->__ifi_pad = 0; 894 ifm->ifi_type = dev->type; 895 ifm->ifi_index = dev->ifindex; 896 ifm->ifi_flags = dev_get_flags(dev); 897 ifm->ifi_change = change; 898 899 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 900 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 901 nla_put_u8(skb, IFLA_OPERSTATE, 902 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 903 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 904 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 905 nla_put_u32(skb, IFLA_GROUP, dev->group) || 906 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 907 (dev->ifindex != dev->iflink && 908 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 909 (dev->master && 910 nla_put_u32(skb, IFLA_MASTER, dev->master->ifindex)) || 911 (dev->qdisc && 912 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 913 (dev->ifalias && 914 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias))) 915 goto nla_put_failure; 916 917 if (1) { 918 struct rtnl_link_ifmap map = { 919 .mem_start = dev->mem_start, 920 .mem_end = dev->mem_end, 921 .base_addr = dev->base_addr, 922 .irq = dev->irq, 923 .dma = dev->dma, 924 .port = dev->if_port, 925 }; 926 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 927 goto nla_put_failure; 928 } 929 930 if (dev->addr_len) { 931 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 932 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 933 goto nla_put_failure; 934 } 935 936 attr = nla_reserve(skb, IFLA_STATS, 937 sizeof(struct rtnl_link_stats)); 938 if (attr == NULL) 939 goto nla_put_failure; 940 941 stats = dev_get_stats(dev, &temp); 942 copy_rtnl_link_stats(nla_data(attr), stats); 943 944 attr = nla_reserve(skb, IFLA_STATS64, 945 sizeof(struct rtnl_link_stats64)); 946 if (attr == NULL) 947 goto nla_put_failure; 948 copy_rtnl_link_stats64(nla_data(attr), stats); 949 950 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 951 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 952 goto nla_put_failure; 953 954 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 955 && (ext_filter_mask & RTEXT_FILTER_VF)) { 956 int i; 957 958 struct nlattr *vfinfo, *vf; 959 int num_vfs = dev_num_vf(dev->dev.parent); 960 961 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 962 if (!vfinfo) 963 goto nla_put_failure; 964 for (i = 0; i < num_vfs; i++) { 965 struct ifla_vf_info ivi; 966 struct ifla_vf_mac vf_mac; 967 struct ifla_vf_vlan vf_vlan; 968 struct ifla_vf_tx_rate vf_tx_rate; 969 struct ifla_vf_spoofchk vf_spoofchk; 970 971 /* 972 * Not all SR-IOV capable drivers support the 973 * spoofcheck query. Preset to -1 so the user 974 * space tool can detect that the driver didn't 975 * report anything. 976 */ 977 ivi.spoofchk = -1; 978 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 979 break; 980 vf_mac.vf = 981 vf_vlan.vf = 982 vf_tx_rate.vf = 983 vf_spoofchk.vf = ivi.vf; 984 985 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 986 vf_vlan.vlan = ivi.vlan; 987 vf_vlan.qos = ivi.qos; 988 vf_tx_rate.rate = ivi.tx_rate; 989 vf_spoofchk.setting = ivi.spoofchk; 990 vf = nla_nest_start(skb, IFLA_VF_INFO); 991 if (!vf) { 992 nla_nest_cancel(skb, vfinfo); 993 goto nla_put_failure; 994 } 995 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 996 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 997 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 998 &vf_tx_rate) || 999 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 1000 &vf_spoofchk)) 1001 goto nla_put_failure; 1002 nla_nest_end(skb, vf); 1003 } 1004 nla_nest_end(skb, vfinfo); 1005 } 1006 1007 if (rtnl_port_fill(skb, dev)) 1008 goto nla_put_failure; 1009 1010 if (dev->rtnl_link_ops) { 1011 if (rtnl_link_fill(skb, dev) < 0) 1012 goto nla_put_failure; 1013 } 1014 1015 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1016 goto nla_put_failure; 1017 1018 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1019 if (af_ops->fill_link_af) { 1020 struct nlattr *af; 1021 int err; 1022 1023 if (!(af = nla_nest_start(skb, af_ops->family))) 1024 goto nla_put_failure; 1025 1026 err = af_ops->fill_link_af(skb, dev); 1027 1028 /* 1029 * Caller may return ENODATA to indicate that there 1030 * was no data to be dumped. This is not an error, it 1031 * means we should trim the attribute header and 1032 * continue. 1033 */ 1034 if (err == -ENODATA) 1035 nla_nest_cancel(skb, af); 1036 else if (err < 0) 1037 goto nla_put_failure; 1038 1039 nla_nest_end(skb, af); 1040 } 1041 } 1042 1043 nla_nest_end(skb, af_spec); 1044 1045 return nlmsg_end(skb, nlh); 1046 1047nla_put_failure: 1048 nlmsg_cancel(skb, nlh); 1049 return -EMSGSIZE; 1050} 1051 1052static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1053{ 1054 struct net *net = sock_net(skb->sk); 1055 int h, s_h; 1056 int idx = 0, s_idx; 1057 struct net_device *dev; 1058 struct hlist_head *head; 1059 struct hlist_node *node; 1060 struct nlattr *tb[IFLA_MAX+1]; 1061 u32 ext_filter_mask = 0; 1062 1063 s_h = cb->args[0]; 1064 s_idx = cb->args[1]; 1065 1066 rcu_read_lock(); 1067 cb->seq = net->dev_base_seq; 1068 1069 if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1070 ifla_policy) >= 0) { 1071 1072 if (tb[IFLA_EXT_MASK]) 1073 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1074 } 1075 1076 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1077 idx = 0; 1078 head = &net->dev_index_head[h]; 1079 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 1080 if (idx < s_idx) 1081 goto cont; 1082 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1083 NETLINK_CB(cb->skb).pid, 1084 cb->nlh->nlmsg_seq, 0, 1085 NLM_F_MULTI, 1086 ext_filter_mask) <= 0) 1087 goto out; 1088 1089 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1090cont: 1091 idx++; 1092 } 1093 } 1094out: 1095 rcu_read_unlock(); 1096 cb->args[1] = idx; 1097 cb->args[0] = h; 1098 1099 return skb->len; 1100} 1101 1102const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1103 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1104 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1105 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1106 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1107 [IFLA_MTU] = { .type = NLA_U32 }, 1108 [IFLA_LINK] = { .type = NLA_U32 }, 1109 [IFLA_MASTER] = { .type = NLA_U32 }, 1110 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1111 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1112 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1113 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1114 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1115 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1116 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1117 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1118 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1119 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1120 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1121 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1122 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1123 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1124}; 1125EXPORT_SYMBOL(ifla_policy); 1126 1127static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1128 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1129 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1130}; 1131 1132static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1133 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1134}; 1135 1136static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1137 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1138 .len = sizeof(struct ifla_vf_mac) }, 1139 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1140 .len = sizeof(struct ifla_vf_vlan) }, 1141 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1142 .len = sizeof(struct ifla_vf_tx_rate) }, 1143 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1144 .len = sizeof(struct ifla_vf_spoofchk) }, 1145}; 1146 1147static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1148 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1149 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1150 .len = PORT_PROFILE_MAX }, 1151 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1152 .len = sizeof(struct ifla_port_vsi)}, 1153 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1154 .len = PORT_UUID_MAX }, 1155 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1156 .len = PORT_UUID_MAX }, 1157 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1158 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1159}; 1160 1161struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1162{ 1163 struct net *net; 1164 /* Examine the link attributes and figure out which 1165 * network namespace we are talking about. 1166 */ 1167 if (tb[IFLA_NET_NS_PID]) 1168 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1169 else if (tb[IFLA_NET_NS_FD]) 1170 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1171 else 1172 net = get_net(src_net); 1173 return net; 1174} 1175EXPORT_SYMBOL(rtnl_link_get_net); 1176 1177static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1178{ 1179 if (dev) { 1180 if (tb[IFLA_ADDRESS] && 1181 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1182 return -EINVAL; 1183 1184 if (tb[IFLA_BROADCAST] && 1185 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1186 return -EINVAL; 1187 } 1188 1189 if (tb[IFLA_AF_SPEC]) { 1190 struct nlattr *af; 1191 int rem, err; 1192 1193 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1194 const struct rtnl_af_ops *af_ops; 1195 1196 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1197 return -EAFNOSUPPORT; 1198 1199 if (!af_ops->set_link_af) 1200 return -EOPNOTSUPP; 1201 1202 if (af_ops->validate_link_af) { 1203 err = af_ops->validate_link_af(dev, af); 1204 if (err < 0) 1205 return err; 1206 } 1207 } 1208 } 1209 1210 return 0; 1211} 1212 1213static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1214{ 1215 int rem, err = -EINVAL; 1216 struct nlattr *vf; 1217 const struct net_device_ops *ops = dev->netdev_ops; 1218 1219 nla_for_each_nested(vf, attr, rem) { 1220 switch (nla_type(vf)) { 1221 case IFLA_VF_MAC: { 1222 struct ifla_vf_mac *ivm; 1223 ivm = nla_data(vf); 1224 err = -EOPNOTSUPP; 1225 if (ops->ndo_set_vf_mac) 1226 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1227 ivm->mac); 1228 break; 1229 } 1230 case IFLA_VF_VLAN: { 1231 struct ifla_vf_vlan *ivv; 1232 ivv = nla_data(vf); 1233 err = -EOPNOTSUPP; 1234 if (ops->ndo_set_vf_vlan) 1235 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1236 ivv->vlan, 1237 ivv->qos); 1238 break; 1239 } 1240 case IFLA_VF_TX_RATE: { 1241 struct ifla_vf_tx_rate *ivt; 1242 ivt = nla_data(vf); 1243 err = -EOPNOTSUPP; 1244 if (ops->ndo_set_vf_tx_rate) 1245 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1246 ivt->rate); 1247 break; 1248 } 1249 case IFLA_VF_SPOOFCHK: { 1250 struct ifla_vf_spoofchk *ivs; 1251 ivs = nla_data(vf); 1252 err = -EOPNOTSUPP; 1253 if (ops->ndo_set_vf_spoofchk) 1254 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1255 ivs->setting); 1256 break; 1257 } 1258 default: 1259 err = -EINVAL; 1260 break; 1261 } 1262 if (err) 1263 break; 1264 } 1265 return err; 1266} 1267 1268static int do_set_master(struct net_device *dev, int ifindex) 1269{ 1270 struct net_device *master_dev; 1271 const struct net_device_ops *ops; 1272 int err; 1273 1274 if (dev->master) { 1275 if (dev->master->ifindex == ifindex) 1276 return 0; 1277 ops = dev->master->netdev_ops; 1278 if (ops->ndo_del_slave) { 1279 err = ops->ndo_del_slave(dev->master, dev); 1280 if (err) 1281 return err; 1282 } else { 1283 return -EOPNOTSUPP; 1284 } 1285 } 1286 1287 if (ifindex) { 1288 master_dev = __dev_get_by_index(dev_net(dev), ifindex); 1289 if (!master_dev) 1290 return -EINVAL; 1291 ops = master_dev->netdev_ops; 1292 if (ops->ndo_add_slave) { 1293 err = ops->ndo_add_slave(master_dev, dev); 1294 if (err) 1295 return err; 1296 } else { 1297 return -EOPNOTSUPP; 1298 } 1299 } 1300 return 0; 1301} 1302 1303static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1304 struct nlattr **tb, char *ifname, int modified) 1305{ 1306 const struct net_device_ops *ops = dev->netdev_ops; 1307 int send_addr_notify = 0; 1308 int err; 1309 1310 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1311 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1312 if (IS_ERR(net)) { 1313 err = PTR_ERR(net); 1314 goto errout; 1315 } 1316 err = dev_change_net_namespace(dev, net, ifname); 1317 put_net(net); 1318 if (err) 1319 goto errout; 1320 modified = 1; 1321 } 1322 1323 if (tb[IFLA_MAP]) { 1324 struct rtnl_link_ifmap *u_map; 1325 struct ifmap k_map; 1326 1327 if (!ops->ndo_set_config) { 1328 err = -EOPNOTSUPP; 1329 goto errout; 1330 } 1331 1332 if (!netif_device_present(dev)) { 1333 err = -ENODEV; 1334 goto errout; 1335 } 1336 1337 u_map = nla_data(tb[IFLA_MAP]); 1338 k_map.mem_start = (unsigned long) u_map->mem_start; 1339 k_map.mem_end = (unsigned long) u_map->mem_end; 1340 k_map.base_addr = (unsigned short) u_map->base_addr; 1341 k_map.irq = (unsigned char) u_map->irq; 1342 k_map.dma = (unsigned char) u_map->dma; 1343 k_map.port = (unsigned char) u_map->port; 1344 1345 err = ops->ndo_set_config(dev, &k_map); 1346 if (err < 0) 1347 goto errout; 1348 1349 modified = 1; 1350 } 1351 1352 if (tb[IFLA_ADDRESS]) { 1353 struct sockaddr *sa; 1354 int len; 1355 1356 if (!ops->ndo_set_mac_address) { 1357 err = -EOPNOTSUPP; 1358 goto errout; 1359 } 1360 1361 if (!netif_device_present(dev)) { 1362 err = -ENODEV; 1363 goto errout; 1364 } 1365 1366 len = sizeof(sa_family_t) + dev->addr_len; 1367 sa = kmalloc(len, GFP_KERNEL); 1368 if (!sa) { 1369 err = -ENOMEM; 1370 goto errout; 1371 } 1372 sa->sa_family = dev->type; 1373 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1374 dev->addr_len); 1375 err = ops->ndo_set_mac_address(dev, sa); 1376 kfree(sa); 1377 if (err) 1378 goto errout; 1379 send_addr_notify = 1; 1380 modified = 1; 1381 } 1382 1383 if (tb[IFLA_MTU]) { 1384 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1385 if (err < 0) 1386 goto errout; 1387 modified = 1; 1388 } 1389 1390 if (tb[IFLA_GROUP]) { 1391 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1392 modified = 1; 1393 } 1394 1395 /* 1396 * Interface selected by interface index but interface 1397 * name provided implies that a name change has been 1398 * requested. 1399 */ 1400 if (ifm->ifi_index > 0 && ifname[0]) { 1401 err = dev_change_name(dev, ifname); 1402 if (err < 0) 1403 goto errout; 1404 modified = 1; 1405 } 1406 1407 if (tb[IFLA_IFALIAS]) { 1408 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1409 nla_len(tb[IFLA_IFALIAS])); 1410 if (err < 0) 1411 goto errout; 1412 modified = 1; 1413 } 1414 1415 if (tb[IFLA_BROADCAST]) { 1416 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1417 send_addr_notify = 1; 1418 } 1419 1420 if (ifm->ifi_flags || ifm->ifi_change) { 1421 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1422 if (err < 0) 1423 goto errout; 1424 } 1425 1426 if (tb[IFLA_MASTER]) { 1427 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1428 if (err) 1429 goto errout; 1430 modified = 1; 1431 } 1432 1433 if (tb[IFLA_TXQLEN]) 1434 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1435 1436 if (tb[IFLA_OPERSTATE]) 1437 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1438 1439 if (tb[IFLA_LINKMODE]) { 1440 write_lock_bh(&dev_base_lock); 1441 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1442 write_unlock_bh(&dev_base_lock); 1443 } 1444 1445 if (tb[IFLA_VFINFO_LIST]) { 1446 struct nlattr *attr; 1447 int rem; 1448 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1449 if (nla_type(attr) != IFLA_VF_INFO) { 1450 err = -EINVAL; 1451 goto errout; 1452 } 1453 err = do_setvfinfo(dev, attr); 1454 if (err < 0) 1455 goto errout; 1456 modified = 1; 1457 } 1458 } 1459 err = 0; 1460 1461 if (tb[IFLA_VF_PORTS]) { 1462 struct nlattr *port[IFLA_PORT_MAX+1]; 1463 struct nlattr *attr; 1464 int vf; 1465 int rem; 1466 1467 err = -EOPNOTSUPP; 1468 if (!ops->ndo_set_vf_port) 1469 goto errout; 1470 1471 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1472 if (nla_type(attr) != IFLA_VF_PORT) 1473 continue; 1474 err = nla_parse_nested(port, IFLA_PORT_MAX, 1475 attr, ifla_port_policy); 1476 if (err < 0) 1477 goto errout; 1478 if (!port[IFLA_PORT_VF]) { 1479 err = -EOPNOTSUPP; 1480 goto errout; 1481 } 1482 vf = nla_get_u32(port[IFLA_PORT_VF]); 1483 err = ops->ndo_set_vf_port(dev, vf, port); 1484 if (err < 0) 1485 goto errout; 1486 modified = 1; 1487 } 1488 } 1489 err = 0; 1490 1491 if (tb[IFLA_PORT_SELF]) { 1492 struct nlattr *port[IFLA_PORT_MAX+1]; 1493 1494 err = nla_parse_nested(port, IFLA_PORT_MAX, 1495 tb[IFLA_PORT_SELF], ifla_port_policy); 1496 if (err < 0) 1497 goto errout; 1498 1499 err = -EOPNOTSUPP; 1500 if (ops->ndo_set_vf_port) 1501 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1502 if (err < 0) 1503 goto errout; 1504 modified = 1; 1505 } 1506 1507 if (tb[IFLA_AF_SPEC]) { 1508 struct nlattr *af; 1509 int rem; 1510 1511 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1512 const struct rtnl_af_ops *af_ops; 1513 1514 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1515 BUG(); 1516 1517 err = af_ops->set_link_af(dev, af); 1518 if (err < 0) 1519 goto errout; 1520 1521 modified = 1; 1522 } 1523 } 1524 err = 0; 1525 1526errout: 1527 if (err < 0 && modified && net_ratelimit()) 1528 printk(KERN_WARNING "A link change request failed with " 1529 "some changes committed already. Interface %s may " 1530 "have been left with an inconsistent configuration, " 1531 "please check.\n", dev->name); 1532 1533 if (send_addr_notify) 1534 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1535 1536 return err; 1537} 1538 1539static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1540{ 1541 struct net *net = sock_net(skb->sk); 1542 struct ifinfomsg *ifm; 1543 struct net_device *dev; 1544 int err; 1545 struct nlattr *tb[IFLA_MAX+1]; 1546 char ifname[IFNAMSIZ]; 1547 1548 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1549 if (err < 0) 1550 goto errout; 1551 1552 if (tb[IFLA_IFNAME]) 1553 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1554 else 1555 ifname[0] = '\0'; 1556 1557 err = -EINVAL; 1558 ifm = nlmsg_data(nlh); 1559 if (ifm->ifi_index > 0) 1560 dev = __dev_get_by_index(net, ifm->ifi_index); 1561 else if (tb[IFLA_IFNAME]) 1562 dev = __dev_get_by_name(net, ifname); 1563 else 1564 goto errout; 1565 1566 if (dev == NULL) { 1567 err = -ENODEV; 1568 goto errout; 1569 } 1570 1571 err = validate_linkmsg(dev, tb); 1572 if (err < 0) 1573 goto errout; 1574 1575 err = do_setlink(dev, ifm, tb, ifname, 0); 1576errout: 1577 return err; 1578} 1579 1580static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1581{ 1582 struct net *net = sock_net(skb->sk); 1583 const struct rtnl_link_ops *ops; 1584 struct net_device *dev; 1585 struct ifinfomsg *ifm; 1586 char ifname[IFNAMSIZ]; 1587 struct nlattr *tb[IFLA_MAX+1]; 1588 int err; 1589 LIST_HEAD(list_kill); 1590 1591 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1592 if (err < 0) 1593 return err; 1594 1595 if (tb[IFLA_IFNAME]) 1596 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1597 1598 ifm = nlmsg_data(nlh); 1599 if (ifm->ifi_index > 0) 1600 dev = __dev_get_by_index(net, ifm->ifi_index); 1601 else if (tb[IFLA_IFNAME]) 1602 dev = __dev_get_by_name(net, ifname); 1603 else 1604 return -EINVAL; 1605 1606 if (!dev) 1607 return -ENODEV; 1608 1609 ops = dev->rtnl_link_ops; 1610 if (!ops) 1611 return -EOPNOTSUPP; 1612 1613 ops->dellink(dev, &list_kill); 1614 unregister_netdevice_many(&list_kill); 1615 list_del(&list_kill); 1616 return 0; 1617} 1618 1619int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1620{ 1621 unsigned int old_flags; 1622 int err; 1623 1624 old_flags = dev->flags; 1625 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1626 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1627 if (err < 0) 1628 return err; 1629 } 1630 1631 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1632 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1633 1634 __dev_notify_flags(dev, old_flags); 1635 return 0; 1636} 1637EXPORT_SYMBOL(rtnl_configure_link); 1638 1639struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1640 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1641{ 1642 int err; 1643 struct net_device *dev; 1644 unsigned int num_queues = 1; 1645 1646 if (ops->get_tx_queues) { 1647 err = ops->get_tx_queues(src_net, tb); 1648 if (err < 0) 1649 goto err; 1650 num_queues = err; 1651 } 1652 1653 err = -ENOMEM; 1654 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1655 if (!dev) 1656 goto err; 1657 1658 dev_net_set(dev, net); 1659 dev->rtnl_link_ops = ops; 1660 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1661 1662 if (tb[IFLA_MTU]) 1663 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1664 if (tb[IFLA_ADDRESS]) 1665 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1666 nla_len(tb[IFLA_ADDRESS])); 1667 if (tb[IFLA_BROADCAST]) 1668 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1669 nla_len(tb[IFLA_BROADCAST])); 1670 if (tb[IFLA_TXQLEN]) 1671 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1672 if (tb[IFLA_OPERSTATE]) 1673 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1674 if (tb[IFLA_LINKMODE]) 1675 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1676 if (tb[IFLA_GROUP]) 1677 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1678 1679 return dev; 1680 1681err: 1682 return ERR_PTR(err); 1683} 1684EXPORT_SYMBOL(rtnl_create_link); 1685 1686static int rtnl_group_changelink(struct net *net, int group, 1687 struct ifinfomsg *ifm, 1688 struct nlattr **tb) 1689{ 1690 struct net_device *dev; 1691 int err; 1692 1693 for_each_netdev(net, dev) { 1694 if (dev->group == group) { 1695 err = do_setlink(dev, ifm, tb, NULL, 0); 1696 if (err < 0) 1697 return err; 1698 } 1699 } 1700 1701 return 0; 1702} 1703 1704static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1705{ 1706 struct net *net = sock_net(skb->sk); 1707 const struct rtnl_link_ops *ops; 1708 struct net_device *dev; 1709 struct ifinfomsg *ifm; 1710 char kind[MODULE_NAME_LEN]; 1711 char ifname[IFNAMSIZ]; 1712 struct nlattr *tb[IFLA_MAX+1]; 1713 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1714 int err; 1715 1716#ifdef CONFIG_MODULES 1717replay: 1718#endif 1719 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1720 if (err < 0) 1721 return err; 1722 1723 if (tb[IFLA_IFNAME]) 1724 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1725 else 1726 ifname[0] = '\0'; 1727 1728 ifm = nlmsg_data(nlh); 1729 if (ifm->ifi_index > 0) 1730 dev = __dev_get_by_index(net, ifm->ifi_index); 1731 else { 1732 if (ifname[0]) 1733 dev = __dev_get_by_name(net, ifname); 1734 else 1735 dev = NULL; 1736 } 1737 1738 err = validate_linkmsg(dev, tb); 1739 if (err < 0) 1740 return err; 1741 1742 if (tb[IFLA_LINKINFO]) { 1743 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1744 tb[IFLA_LINKINFO], ifla_info_policy); 1745 if (err < 0) 1746 return err; 1747 } else 1748 memset(linkinfo, 0, sizeof(linkinfo)); 1749 1750 if (linkinfo[IFLA_INFO_KIND]) { 1751 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1752 ops = rtnl_link_ops_get(kind); 1753 } else { 1754 kind[0] = '\0'; 1755 ops = NULL; 1756 } 1757 1758 if (1) { 1759 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1760 struct net *dest_net; 1761 1762 if (ops) { 1763 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1764 err = nla_parse_nested(attr, ops->maxtype, 1765 linkinfo[IFLA_INFO_DATA], 1766 ops->policy); 1767 if (err < 0) 1768 return err; 1769 data = attr; 1770 } 1771 if (ops->validate) { 1772 err = ops->validate(tb, data); 1773 if (err < 0) 1774 return err; 1775 } 1776 } 1777 1778 if (dev) { 1779 int modified = 0; 1780 1781 if (nlh->nlmsg_flags & NLM_F_EXCL) 1782 return -EEXIST; 1783 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1784 return -EOPNOTSUPP; 1785 1786 if (linkinfo[IFLA_INFO_DATA]) { 1787 if (!ops || ops != dev->rtnl_link_ops || 1788 !ops->changelink) 1789 return -EOPNOTSUPP; 1790 1791 err = ops->changelink(dev, tb, data); 1792 if (err < 0) 1793 return err; 1794 modified = 1; 1795 } 1796 1797 return do_setlink(dev, ifm, tb, ifname, modified); 1798 } 1799 1800 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1801 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1802 return rtnl_group_changelink(net, 1803 nla_get_u32(tb[IFLA_GROUP]), 1804 ifm, tb); 1805 return -ENODEV; 1806 } 1807 1808 if (ifm->ifi_index) 1809 return -EOPNOTSUPP; 1810 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1811 return -EOPNOTSUPP; 1812 1813 if (!ops) { 1814#ifdef CONFIG_MODULES 1815 if (kind[0]) { 1816 __rtnl_unlock(); 1817 request_module("rtnl-link-%s", kind); 1818 rtnl_lock(); 1819 ops = rtnl_link_ops_get(kind); 1820 if (ops) 1821 goto replay; 1822 } 1823#endif 1824 return -EOPNOTSUPP; 1825 } 1826 1827 if (!ifname[0]) 1828 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1829 1830 dest_net = rtnl_link_get_net(net, tb); 1831 if (IS_ERR(dest_net)) 1832 return PTR_ERR(dest_net); 1833 1834 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1835 1836 if (IS_ERR(dev)) 1837 err = PTR_ERR(dev); 1838 else if (ops->newlink) 1839 err = ops->newlink(net, dev, tb, data); 1840 else 1841 err = register_netdevice(dev); 1842 1843 if (err < 0 && !IS_ERR(dev)) 1844 free_netdev(dev); 1845 if (err < 0) 1846 goto out; 1847 1848 err = rtnl_configure_link(dev, ifm); 1849 if (err < 0) 1850 unregister_netdevice(dev); 1851out: 1852 put_net(dest_net); 1853 return err; 1854 } 1855} 1856 1857static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1858{ 1859 struct net *net = sock_net(skb->sk); 1860 struct ifinfomsg *ifm; 1861 char ifname[IFNAMSIZ]; 1862 struct nlattr *tb[IFLA_MAX+1]; 1863 struct net_device *dev = NULL; 1864 struct sk_buff *nskb; 1865 int err; 1866 u32 ext_filter_mask = 0; 1867 1868 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1869 if (err < 0) 1870 return err; 1871 1872 if (tb[IFLA_IFNAME]) 1873 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1874 1875 if (tb[IFLA_EXT_MASK]) 1876 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1877 1878 ifm = nlmsg_data(nlh); 1879 if (ifm->ifi_index > 0) 1880 dev = __dev_get_by_index(net, ifm->ifi_index); 1881 else if (tb[IFLA_IFNAME]) 1882 dev = __dev_get_by_name(net, ifname); 1883 else 1884 return -EINVAL; 1885 1886 if (dev == NULL) 1887 return -ENODEV; 1888 1889 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1890 if (nskb == NULL) 1891 return -ENOBUFS; 1892 1893 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1894 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1895 if (err < 0) { 1896 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1897 WARN_ON(err == -EMSGSIZE); 1898 kfree_skb(nskb); 1899 } else 1900 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1901 1902 return err; 1903} 1904 1905static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1906{ 1907 struct net *net = sock_net(skb->sk); 1908 struct net_device *dev; 1909 struct nlattr *tb[IFLA_MAX+1]; 1910 u32 ext_filter_mask = 0; 1911 u16 min_ifinfo_dump_size = 0; 1912 1913 if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, 1914 ifla_policy) >= 0) { 1915 if (tb[IFLA_EXT_MASK]) 1916 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1917 } 1918 1919 if (!ext_filter_mask) 1920 return NLMSG_GOODSIZE; 1921 /* 1922 * traverse the list of net devices and compute the minimum 1923 * buffer size based upon the filter mask. 1924 */ 1925 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1926 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1927 if_nlmsg_size(dev, 1928 ext_filter_mask)); 1929 } 1930 1931 return min_ifinfo_dump_size; 1932} 1933 1934static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1935{ 1936 int idx; 1937 int s_idx = cb->family; 1938 1939 if (s_idx == 0) 1940 s_idx = 1; 1941 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1942 int type = cb->nlh->nlmsg_type-RTM_BASE; 1943 if (idx < s_idx || idx == PF_PACKET) 1944 continue; 1945 if (rtnl_msg_handlers[idx] == NULL || 1946 rtnl_msg_handlers[idx][type].dumpit == NULL) 1947 continue; 1948 if (idx > s_idx) 1949 memset(&cb->args[0], 0, sizeof(cb->args)); 1950 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1951 break; 1952 } 1953 cb->family = idx; 1954 1955 return skb->len; 1956} 1957 1958void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change) 1959{ 1960 struct net *net = dev_net(dev); 1961 struct sk_buff *skb; 1962 int err = -ENOBUFS; 1963 size_t if_info_size; 1964 1965 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL); 1966 if (skb == NULL) 1967 goto errout; 1968 1969 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 1970 if (err < 0) { 1971 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1972 WARN_ON(err == -EMSGSIZE); 1973 kfree_skb(skb); 1974 goto errout; 1975 } 1976 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1977 return; 1978errout: 1979 if (err < 0) 1980 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1981} 1982 1983static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 1984 struct net_device *dev, 1985 u8 *addr, u32 pid, u32 seq, 1986 int type, unsigned int flags) 1987{ 1988 struct nlmsghdr *nlh; 1989 struct ndmsg *ndm; 1990 1991 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI); 1992 if (!nlh) 1993 return -EMSGSIZE; 1994 1995 ndm = nlmsg_data(nlh); 1996 ndm->ndm_family = AF_BRIDGE; 1997 ndm->ndm_pad1 = 0; 1998 ndm->ndm_pad2 = 0; 1999 ndm->ndm_flags = flags; 2000 ndm->ndm_type = 0; 2001 ndm->ndm_ifindex = dev->ifindex; 2002 ndm->ndm_state = NUD_PERMANENT; 2003 2004 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 2005 goto nla_put_failure; 2006 2007 return nlmsg_end(skb, nlh); 2008 2009nla_put_failure: 2010 nlmsg_cancel(skb, nlh); 2011 return -EMSGSIZE; 2012} 2013 2014static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2015{ 2016 struct net *net = sock_net(skb->sk); 2017 struct net_device *master = NULL; 2018 struct ndmsg *ndm; 2019 struct nlattr *tb[NDA_MAX+1]; 2020 struct net_device *dev; 2021 u8 *addr; 2022 int err; 2023 2024 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2025 if (err < 0) 2026 return err; 2027 2028 ndm = nlmsg_data(nlh); 2029 if (ndm->ndm_ifindex == 0) { 2030 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2031 return -EINVAL; 2032 } 2033 2034 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2035 if (dev == NULL) { 2036 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2037 return -ENODEV; 2038 } 2039 2040 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2041 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2042 return -EINVAL; 2043 } 2044 2045 addr = nla_data(tb[NDA_LLADDR]); 2046 if (!is_valid_ether_addr(addr)) { 2047 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n"); 2048 return -EINVAL; 2049 } 2050 2051 err = -EOPNOTSUPP; 2052 2053 /* Support fdb on master device the net/bridge default case */ 2054 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2055 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2056 master = dev->master; 2057 err = master->netdev_ops->ndo_fdb_add(ndm, dev, addr, 2058 nlh->nlmsg_flags); 2059 if (err) 2060 goto out; 2061 else 2062 ndm->ndm_flags &= ~NTF_MASTER; 2063 } 2064 2065 /* Embedded bridge, macvlan, and any other device support */ 2066 if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_add) { 2067 err = dev->netdev_ops->ndo_fdb_add(ndm, dev, addr, 2068 nlh->nlmsg_flags); 2069 2070 if (!err) 2071 ndm->ndm_flags &= ~NTF_SELF; 2072 } 2073out: 2074 return err; 2075} 2076 2077static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2078{ 2079 struct net *net = sock_net(skb->sk); 2080 struct ndmsg *ndm; 2081 struct nlattr *llattr; 2082 struct net_device *dev; 2083 int err = -EINVAL; 2084 __u8 *addr; 2085 2086 if (nlmsg_len(nlh) < sizeof(*ndm)) 2087 return -EINVAL; 2088 2089 ndm = nlmsg_data(nlh); 2090 if (ndm->ndm_ifindex == 0) { 2091 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2092 return -EINVAL; 2093 } 2094 2095 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2096 if (dev == NULL) { 2097 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2098 return -ENODEV; 2099 } 2100 2101 llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR); 2102 if (llattr == NULL || nla_len(llattr) != ETH_ALEN) { 2103 pr_info("PF_BRIGDE: RTM_DELNEIGH with invalid address\n"); 2104 return -EINVAL; 2105 } 2106 2107 addr = nla_data(llattr); 2108 err = -EOPNOTSUPP; 2109 2110 /* Support fdb on master device the net/bridge default case */ 2111 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2112 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2113 struct net_device *master = dev->master; 2114 2115 if (master->netdev_ops->ndo_fdb_del) 2116 err = master->netdev_ops->ndo_fdb_del(ndm, dev, addr); 2117 2118 if (err) 2119 goto out; 2120 else 2121 ndm->ndm_flags &= ~NTF_MASTER; 2122 } 2123 2124 /* Embedded bridge, macvlan, and any other device support */ 2125 if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_del) { 2126 err = dev->netdev_ops->ndo_fdb_del(ndm, dev, addr); 2127 2128 if (!err) 2129 ndm->ndm_flags &= ~NTF_SELF; 2130 } 2131out: 2132 return err; 2133} 2134 2135static int nlmsg_populate_fdb(struct sk_buff *skb, 2136 struct netlink_callback *cb, 2137 struct net_device *dev, 2138 int *idx, 2139 struct netdev_hw_addr_list *list) 2140{ 2141 struct netdev_hw_addr *ha; 2142 int err; 2143 u32 pid, seq; 2144 2145 pid = NETLINK_CB(cb->skb).pid; 2146 seq = cb->nlh->nlmsg_seq; 2147 2148 list_for_each_entry(ha, &list->list, list) { 2149 if (*idx < cb->args[0]) 2150 goto skip; 2151 2152 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2153 pid, seq, 0, NTF_SELF); 2154 if (err < 0) 2155 return err; 2156skip: 2157 *idx += 1; 2158 } 2159 return 0; 2160} 2161 2162/** 2163 * ndo_dflt_fdb_dump: default netdevice operation to dump an FDB table. 2164 * @nlh: netlink message header 2165 * @dev: netdevice 2166 * 2167 * Default netdevice operation to dump the existing unicast address list. 2168 * Returns zero on success. 2169 */ 2170int ndo_dflt_fdb_dump(struct sk_buff *skb, 2171 struct netlink_callback *cb, 2172 struct net_device *dev, 2173 int idx) 2174{ 2175 int err; 2176 2177 netif_addr_lock_bh(dev); 2178 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2179 if (err) 2180 goto out; 2181 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2182out: 2183 netif_addr_unlock_bh(dev); 2184 return idx; 2185} 2186EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2187 2188static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2189{ 2190 int idx = 0; 2191 struct net *net = sock_net(skb->sk); 2192 struct net_device *dev; 2193 2194 rcu_read_lock(); 2195 for_each_netdev_rcu(net, dev) { 2196 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2197 struct net_device *master = dev->master; 2198 const struct net_device_ops *ops = master->netdev_ops; 2199 2200 if (ops->ndo_fdb_dump) 2201 idx = ops->ndo_fdb_dump(skb, cb, dev, idx); 2202 } 2203 2204 if (dev->netdev_ops->ndo_fdb_dump) 2205 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx); 2206 } 2207 rcu_read_unlock(); 2208 2209 cb->args[0] = idx; 2210 return skb->len; 2211} 2212 2213/* Protected by RTNL sempahore. */ 2214static struct rtattr **rta_buf; 2215static int rtattr_max; 2216 2217/* Process one rtnetlink message. */ 2218 2219static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2220{ 2221 struct net *net = sock_net(skb->sk); 2222 rtnl_doit_func doit; 2223 int sz_idx, kind; 2224 int min_len; 2225 int family; 2226 int type; 2227 int err; 2228 2229 type = nlh->nlmsg_type; 2230 if (type > RTM_MAX) 2231 return -EOPNOTSUPP; 2232 2233 type -= RTM_BASE; 2234 2235 /* All the messages must have at least 1 byte length */ 2236 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 2237 return 0; 2238 2239 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 2240 sz_idx = type>>2; 2241 kind = type&3; 2242 2243 if (kind != 2 && !capable(CAP_NET_ADMIN)) 2244 return -EPERM; 2245 2246 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2247 struct sock *rtnl; 2248 rtnl_dumpit_func dumpit; 2249 rtnl_calcit_func calcit; 2250 u16 min_dump_alloc = 0; 2251 2252 dumpit = rtnl_get_dumpit(family, type); 2253 if (dumpit == NULL) 2254 return -EOPNOTSUPP; 2255 calcit = rtnl_get_calcit(family, type); 2256 if (calcit) 2257 min_dump_alloc = calcit(skb, nlh); 2258 2259 __rtnl_unlock(); 2260 rtnl = net->rtnl; 2261 { 2262 struct netlink_dump_control c = { 2263 .dump = dumpit, 2264 .min_dump_alloc = min_dump_alloc, 2265 }; 2266 err = netlink_dump_start(rtnl, skb, nlh, &c); 2267 } 2268 rtnl_lock(); 2269 return err; 2270 } 2271 2272 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 2273 2274 min_len = rtm_min[sz_idx]; 2275 if (nlh->nlmsg_len < min_len) 2276 return -EINVAL; 2277 2278 if (nlh->nlmsg_len > min_len) { 2279 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 2280 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 2281 2282 while (RTA_OK(attr, attrlen)) { 2283 unsigned int flavor = attr->rta_type; 2284 if (flavor) { 2285 if (flavor > rta_max[sz_idx]) 2286 return -EINVAL; 2287 rta_buf[flavor-1] = attr; 2288 } 2289 attr = RTA_NEXT(attr, attrlen); 2290 } 2291 } 2292 2293 doit = rtnl_get_doit(family, type); 2294 if (doit == NULL) 2295 return -EOPNOTSUPP; 2296 2297 return doit(skb, nlh, (void *)&rta_buf[0]); 2298} 2299 2300static void rtnetlink_rcv(struct sk_buff *skb) 2301{ 2302 rtnl_lock(); 2303 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2304 rtnl_unlock(); 2305} 2306 2307static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2308{ 2309 struct net_device *dev = ptr; 2310 2311 switch (event) { 2312 case NETDEV_UP: 2313 case NETDEV_DOWN: 2314 case NETDEV_PRE_UP: 2315 case NETDEV_POST_INIT: 2316 case NETDEV_REGISTER: 2317 case NETDEV_CHANGE: 2318 case NETDEV_PRE_TYPE_CHANGE: 2319 case NETDEV_GOING_DOWN: 2320 case NETDEV_UNREGISTER: 2321 case NETDEV_UNREGISTER_BATCH: 2322 case NETDEV_RELEASE: 2323 case NETDEV_JOIN: 2324 break; 2325 default: 2326 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2327 break; 2328 } 2329 return NOTIFY_DONE; 2330} 2331 2332static struct notifier_block rtnetlink_dev_notifier = { 2333 .notifier_call = rtnetlink_event, 2334}; 2335 2336 2337static int __net_init rtnetlink_net_init(struct net *net) 2338{ 2339 struct sock *sk; 2340 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 2341 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 2342 if (!sk) 2343 return -ENOMEM; 2344 net->rtnl = sk; 2345 return 0; 2346} 2347 2348static void __net_exit rtnetlink_net_exit(struct net *net) 2349{ 2350 netlink_kernel_release(net->rtnl); 2351 net->rtnl = NULL; 2352} 2353 2354static struct pernet_operations rtnetlink_net_ops = { 2355 .init = rtnetlink_net_init, 2356 .exit = rtnetlink_net_exit, 2357}; 2358 2359void __init rtnetlink_init(void) 2360{ 2361 int i; 2362 2363 rtattr_max = 0; 2364 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 2365 if (rta_max[i] > rtattr_max) 2366 rtattr_max = rta_max[i]; 2367 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 2368 if (!rta_buf) 2369 panic("rtnetlink_init: cannot allocate rta_buf\n"); 2370 2371 if (register_pernet_subsys(&rtnetlink_net_ops)) 2372 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2373 2374 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 2375 register_netdevice_notifier(&rtnetlink_dev_notifier); 2376 2377 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2378 rtnl_dump_ifinfo, rtnl_calcit); 2379 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2380 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2381 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2382 2383 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2384 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2385 2386 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 2387 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 2388 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 2389} 2390 2391