rtnetlink.c revision f18da14565819ba43b8321237e2426a2914cc2ef
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 56struct rtnl_link { 57 rtnl_doit_func doit; 58 rtnl_dumpit_func dumpit; 59 rtnl_calcit_func calcit; 60}; 61 62static DEFINE_MUTEX(rtnl_mutex); 63static u16 min_ifinfo_dump_size; 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 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 NLA_PUT_U32(skb, i+1, metrics[i]); 613 } 614 } 615 616 if (!valid) { 617 nla_nest_cancel(skb, mx); 618 return 0; 619 } 620 621 return nla_nest_end(skb, mx); 622 623nla_put_failure: 624 nla_nest_cancel(skb, mx); 625 return -EMSGSIZE; 626} 627EXPORT_SYMBOL(rtnetlink_put_metrics); 628 629int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 630 u32 ts, u32 tsage, long expires, u32 error) 631{ 632 struct rta_cacheinfo ci = { 633 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 634 .rta_used = dst->__use, 635 .rta_clntref = atomic_read(&(dst->__refcnt)), 636 .rta_error = error, 637 .rta_id = id, 638 .rta_ts = ts, 639 .rta_tsage = tsage, 640 }; 641 642 if (expires) 643 ci.rta_expires = jiffies_to_clock_t(expires); 644 645 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 646} 647EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 648 649static void set_operstate(struct net_device *dev, unsigned char transition) 650{ 651 unsigned char operstate = dev->operstate; 652 653 switch (transition) { 654 case IF_OPER_UP: 655 if ((operstate == IF_OPER_DORMANT || 656 operstate == IF_OPER_UNKNOWN) && 657 !netif_dormant(dev)) 658 operstate = IF_OPER_UP; 659 break; 660 661 case IF_OPER_DORMANT: 662 if (operstate == IF_OPER_UP || 663 operstate == IF_OPER_UNKNOWN) 664 operstate = IF_OPER_DORMANT; 665 break; 666 } 667 668 if (dev->operstate != operstate) { 669 write_lock_bh(&dev_base_lock); 670 dev->operstate = operstate; 671 write_unlock_bh(&dev_base_lock); 672 netdev_state_change(dev); 673 } 674} 675 676static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 677 const struct ifinfomsg *ifm) 678{ 679 unsigned int flags = ifm->ifi_flags; 680 681 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 682 if (ifm->ifi_change) 683 flags = (flags & ifm->ifi_change) | 684 (dev->flags & ~ifm->ifi_change); 685 686 return flags; 687} 688 689static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 690 const struct rtnl_link_stats64 *b) 691{ 692 a->rx_packets = b->rx_packets; 693 a->tx_packets = b->tx_packets; 694 a->rx_bytes = b->rx_bytes; 695 a->tx_bytes = b->tx_bytes; 696 a->rx_errors = b->rx_errors; 697 a->tx_errors = b->tx_errors; 698 a->rx_dropped = b->rx_dropped; 699 a->tx_dropped = b->tx_dropped; 700 701 a->multicast = b->multicast; 702 a->collisions = b->collisions; 703 704 a->rx_length_errors = b->rx_length_errors; 705 a->rx_over_errors = b->rx_over_errors; 706 a->rx_crc_errors = b->rx_crc_errors; 707 a->rx_frame_errors = b->rx_frame_errors; 708 a->rx_fifo_errors = b->rx_fifo_errors; 709 a->rx_missed_errors = b->rx_missed_errors; 710 711 a->tx_aborted_errors = b->tx_aborted_errors; 712 a->tx_carrier_errors = b->tx_carrier_errors; 713 a->tx_fifo_errors = b->tx_fifo_errors; 714 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 715 a->tx_window_errors = b->tx_window_errors; 716 717 a->rx_compressed = b->rx_compressed; 718 a->tx_compressed = b->tx_compressed; 719} 720 721static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 722{ 723 memcpy(v, b, sizeof(*b)); 724} 725 726/* All VF info */ 727static inline int rtnl_vfinfo_size(const struct net_device *dev) 728{ 729 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) { 730 731 int num_vfs = dev_num_vf(dev->dev.parent); 732 size_t size = nla_total_size(sizeof(struct nlattr)); 733 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 734 size += num_vfs * 735 (nla_total_size(sizeof(struct ifla_vf_mac)) + 736 nla_total_size(sizeof(struct ifla_vf_vlan)) + 737 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 738 nla_total_size(sizeof(struct ifla_vf_spoofchk))); 739 return size; 740 } else 741 return 0; 742} 743 744static size_t rtnl_port_size(const struct net_device *dev) 745{ 746 size_t port_size = nla_total_size(4) /* PORT_VF */ 747 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 748 + nla_total_size(sizeof(struct ifla_port_vsi)) 749 /* PORT_VSI_TYPE */ 750 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 751 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 752 + nla_total_size(1) /* PROT_VDP_REQUEST */ 753 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 754 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 755 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 756 + port_size; 757 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 758 + port_size; 759 760 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 761 return 0; 762 if (dev_num_vf(dev->dev.parent)) 763 return port_self_size + vf_ports_size + 764 vf_port_size * dev_num_vf(dev->dev.parent); 765 else 766 return port_self_size; 767} 768 769static noinline size_t if_nlmsg_size(const struct net_device *dev) 770{ 771 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 772 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 773 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 774 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 775 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 776 + nla_total_size(sizeof(struct rtnl_link_stats)) 777 + nla_total_size(sizeof(struct rtnl_link_stats64)) 778 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 779 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 780 + nla_total_size(4) /* IFLA_TXQLEN */ 781 + nla_total_size(4) /* IFLA_WEIGHT */ 782 + nla_total_size(4) /* IFLA_MTU */ 783 + nla_total_size(4) /* IFLA_LINK */ 784 + nla_total_size(4) /* IFLA_MASTER */ 785 + nla_total_size(1) /* IFLA_OPERSTATE */ 786 + nla_total_size(1) /* IFLA_LINKMODE */ 787 + nla_total_size(4) /* IFLA_NUM_VF */ 788 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */ 789 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 790 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 791 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 792} 793 794static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 795{ 796 struct nlattr *vf_ports; 797 struct nlattr *vf_port; 798 int vf; 799 int err; 800 801 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 802 if (!vf_ports) 803 return -EMSGSIZE; 804 805 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 806 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 807 if (!vf_port) 808 goto nla_put_failure; 809 NLA_PUT_U32(skb, IFLA_PORT_VF, vf); 810 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 811 if (err == -EMSGSIZE) 812 goto nla_put_failure; 813 if (err) { 814 nla_nest_cancel(skb, vf_port); 815 continue; 816 } 817 nla_nest_end(skb, vf_port); 818 } 819 820 nla_nest_end(skb, vf_ports); 821 822 return 0; 823 824nla_put_failure: 825 nla_nest_cancel(skb, vf_ports); 826 return -EMSGSIZE; 827} 828 829static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 830{ 831 struct nlattr *port_self; 832 int err; 833 834 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 835 if (!port_self) 836 return -EMSGSIZE; 837 838 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 839 if (err) { 840 nla_nest_cancel(skb, port_self); 841 return (err == -EMSGSIZE) ? err : 0; 842 } 843 844 nla_nest_end(skb, port_self); 845 846 return 0; 847} 848 849static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 850{ 851 int err; 852 853 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 854 return 0; 855 856 err = rtnl_port_self_fill(skb, dev); 857 if (err) 858 return err; 859 860 if (dev_num_vf(dev->dev.parent)) { 861 err = rtnl_vf_ports_fill(skb, dev); 862 if (err) 863 return err; 864 } 865 866 return 0; 867} 868 869static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 870 int type, u32 pid, u32 seq, u32 change, 871 unsigned int flags) 872{ 873 struct ifinfomsg *ifm; 874 struct nlmsghdr *nlh; 875 struct rtnl_link_stats64 temp; 876 const struct rtnl_link_stats64 *stats; 877 struct nlattr *attr, *af_spec; 878 struct rtnl_af_ops *af_ops; 879 880 ASSERT_RTNL(); 881 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 882 if (nlh == NULL) 883 return -EMSGSIZE; 884 885 ifm = nlmsg_data(nlh); 886 ifm->ifi_family = AF_UNSPEC; 887 ifm->__ifi_pad = 0; 888 ifm->ifi_type = dev->type; 889 ifm->ifi_index = dev->ifindex; 890 ifm->ifi_flags = dev_get_flags(dev); 891 ifm->ifi_change = change; 892 893 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 894 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 895 NLA_PUT_U8(skb, IFLA_OPERSTATE, 896 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 897 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 898 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 899 NLA_PUT_U32(skb, IFLA_GROUP, dev->group); 900 901 if (dev->ifindex != dev->iflink) 902 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 903 904 if (dev->master) 905 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 906 907 if (dev->qdisc) 908 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 909 910 if (dev->ifalias) 911 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 912 913 if (1) { 914 struct rtnl_link_ifmap map = { 915 .mem_start = dev->mem_start, 916 .mem_end = dev->mem_end, 917 .base_addr = dev->base_addr, 918 .irq = dev->irq, 919 .dma = dev->dma, 920 .port = dev->if_port, 921 }; 922 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 923 } 924 925 if (dev->addr_len) { 926 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 927 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 928 } 929 930 attr = nla_reserve(skb, IFLA_STATS, 931 sizeof(struct rtnl_link_stats)); 932 if (attr == NULL) 933 goto nla_put_failure; 934 935 stats = dev_get_stats(dev, &temp); 936 copy_rtnl_link_stats(nla_data(attr), stats); 937 938 attr = nla_reserve(skb, IFLA_STATS64, 939 sizeof(struct rtnl_link_stats64)); 940 if (attr == NULL) 941 goto nla_put_failure; 942 copy_rtnl_link_stats64(nla_data(attr), stats); 943 944 if (dev->dev.parent) 945 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); 946 947 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) { 948 int i; 949 950 struct nlattr *vfinfo, *vf; 951 int num_vfs = dev_num_vf(dev->dev.parent); 952 953 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 954 if (!vfinfo) 955 goto nla_put_failure; 956 for (i = 0; i < num_vfs; i++) { 957 struct ifla_vf_info ivi; 958 struct ifla_vf_mac vf_mac; 959 struct ifla_vf_vlan vf_vlan; 960 struct ifla_vf_tx_rate vf_tx_rate; 961 struct ifla_vf_spoofchk vf_spoofchk; 962 963 /* 964 * Not all SR-IOV capable drivers support the 965 * spoofcheck query. Preset to -1 so the user 966 * space tool can detect that the driver didn't 967 * report anything. 968 */ 969 ivi.spoofchk = -1; 970 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 971 break; 972 vf_mac.vf = 973 vf_vlan.vf = 974 vf_tx_rate.vf = 975 vf_spoofchk.vf = ivi.vf; 976 977 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 978 vf_vlan.vlan = ivi.vlan; 979 vf_vlan.qos = ivi.qos; 980 vf_tx_rate.rate = ivi.tx_rate; 981 vf_spoofchk.setting = ivi.spoofchk; 982 vf = nla_nest_start(skb, IFLA_VF_INFO); 983 if (!vf) { 984 nla_nest_cancel(skb, vfinfo); 985 goto nla_put_failure; 986 } 987 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac); 988 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan); 989 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 990 &vf_tx_rate); 991 NLA_PUT(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 992 &vf_spoofchk); 993 nla_nest_end(skb, vf); 994 } 995 nla_nest_end(skb, vfinfo); 996 } 997 998 if (rtnl_port_fill(skb, dev)) 999 goto nla_put_failure; 1000 1001 if (dev->rtnl_link_ops) { 1002 if (rtnl_link_fill(skb, dev) < 0) 1003 goto nla_put_failure; 1004 } 1005 1006 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 1007 goto nla_put_failure; 1008 1009 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1010 if (af_ops->fill_link_af) { 1011 struct nlattr *af; 1012 int err; 1013 1014 if (!(af = nla_nest_start(skb, af_ops->family))) 1015 goto nla_put_failure; 1016 1017 err = af_ops->fill_link_af(skb, dev); 1018 1019 /* 1020 * Caller may return ENODATA to indicate that there 1021 * was no data to be dumped. This is not an error, it 1022 * means we should trim the attribute header and 1023 * continue. 1024 */ 1025 if (err == -ENODATA) 1026 nla_nest_cancel(skb, af); 1027 else if (err < 0) 1028 goto nla_put_failure; 1029 1030 nla_nest_end(skb, af); 1031 } 1032 } 1033 1034 nla_nest_end(skb, af_spec); 1035 1036 return nlmsg_end(skb, nlh); 1037 1038nla_put_failure: 1039 nlmsg_cancel(skb, nlh); 1040 return -EMSGSIZE; 1041} 1042 1043static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1044{ 1045 struct net *net = sock_net(skb->sk); 1046 int h, s_h; 1047 int idx = 0, s_idx; 1048 struct net_device *dev; 1049 struct hlist_head *head; 1050 struct hlist_node *node; 1051 1052 s_h = cb->args[0]; 1053 s_idx = cb->args[1]; 1054 1055 rcu_read_lock(); 1056 cb->seq = net->dev_base_seq; 1057 1058 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1059 idx = 0; 1060 head = &net->dev_index_head[h]; 1061 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 1062 if (idx < s_idx) 1063 goto cont; 1064 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1065 NETLINK_CB(cb->skb).pid, 1066 cb->nlh->nlmsg_seq, 0, 1067 NLM_F_MULTI) <= 0) 1068 goto out; 1069 1070 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1071cont: 1072 idx++; 1073 } 1074 } 1075out: 1076 rcu_read_unlock(); 1077 cb->args[1] = idx; 1078 cb->args[0] = h; 1079 1080 return skb->len; 1081} 1082 1083const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1084 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1085 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1086 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1087 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1088 [IFLA_MTU] = { .type = NLA_U32 }, 1089 [IFLA_LINK] = { .type = NLA_U32 }, 1090 [IFLA_MASTER] = { .type = NLA_U32 }, 1091 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1092 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1093 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1094 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1095 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1096 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1097 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1098 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1099 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1100 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1101 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1102 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1103}; 1104EXPORT_SYMBOL(ifla_policy); 1105 1106static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1107 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1108 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1109}; 1110 1111static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1112 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1113}; 1114 1115static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1116 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1117 .len = sizeof(struct ifla_vf_mac) }, 1118 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1119 .len = sizeof(struct ifla_vf_vlan) }, 1120 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1121 .len = sizeof(struct ifla_vf_tx_rate) }, 1122}; 1123 1124static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1125 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1126 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1127 .len = PORT_PROFILE_MAX }, 1128 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1129 .len = sizeof(struct ifla_port_vsi)}, 1130 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1131 .len = PORT_UUID_MAX }, 1132 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1133 .len = PORT_UUID_MAX }, 1134 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1135 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1136}; 1137 1138struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1139{ 1140 struct net *net; 1141 /* Examine the link attributes and figure out which 1142 * network namespace we are talking about. 1143 */ 1144 if (tb[IFLA_NET_NS_PID]) 1145 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1146 else if (tb[IFLA_NET_NS_FD]) 1147 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1148 else 1149 net = get_net(src_net); 1150 return net; 1151} 1152EXPORT_SYMBOL(rtnl_link_get_net); 1153 1154static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1155{ 1156 if (dev) { 1157 if (tb[IFLA_ADDRESS] && 1158 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1159 return -EINVAL; 1160 1161 if (tb[IFLA_BROADCAST] && 1162 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1163 return -EINVAL; 1164 } 1165 1166 if (tb[IFLA_AF_SPEC]) { 1167 struct nlattr *af; 1168 int rem, err; 1169 1170 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1171 const struct rtnl_af_ops *af_ops; 1172 1173 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1174 return -EAFNOSUPPORT; 1175 1176 if (!af_ops->set_link_af) 1177 return -EOPNOTSUPP; 1178 1179 if (af_ops->validate_link_af) { 1180 err = af_ops->validate_link_af(dev, af); 1181 if (err < 0) 1182 return err; 1183 } 1184 } 1185 } 1186 1187 return 0; 1188} 1189 1190static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1191{ 1192 int rem, err = -EINVAL; 1193 struct nlattr *vf; 1194 const struct net_device_ops *ops = dev->netdev_ops; 1195 1196 nla_for_each_nested(vf, attr, rem) { 1197 switch (nla_type(vf)) { 1198 case IFLA_VF_MAC: { 1199 struct ifla_vf_mac *ivm; 1200 ivm = nla_data(vf); 1201 err = -EOPNOTSUPP; 1202 if (ops->ndo_set_vf_mac) 1203 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1204 ivm->mac); 1205 break; 1206 } 1207 case IFLA_VF_VLAN: { 1208 struct ifla_vf_vlan *ivv; 1209 ivv = nla_data(vf); 1210 err = -EOPNOTSUPP; 1211 if (ops->ndo_set_vf_vlan) 1212 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1213 ivv->vlan, 1214 ivv->qos); 1215 break; 1216 } 1217 case IFLA_VF_TX_RATE: { 1218 struct ifla_vf_tx_rate *ivt; 1219 ivt = nla_data(vf); 1220 err = -EOPNOTSUPP; 1221 if (ops->ndo_set_vf_tx_rate) 1222 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1223 ivt->rate); 1224 break; 1225 } 1226 case IFLA_VF_SPOOFCHK: { 1227 struct ifla_vf_spoofchk *ivs; 1228 ivs = nla_data(vf); 1229 err = -EOPNOTSUPP; 1230 if (ops->ndo_set_vf_spoofchk) 1231 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1232 ivs->setting); 1233 break; 1234 } 1235 default: 1236 err = -EINVAL; 1237 break; 1238 } 1239 if (err) 1240 break; 1241 } 1242 return err; 1243} 1244 1245static int do_set_master(struct net_device *dev, int ifindex) 1246{ 1247 struct net_device *master_dev; 1248 const struct net_device_ops *ops; 1249 int err; 1250 1251 if (dev->master) { 1252 if (dev->master->ifindex == ifindex) 1253 return 0; 1254 ops = dev->master->netdev_ops; 1255 if (ops->ndo_del_slave) { 1256 err = ops->ndo_del_slave(dev->master, dev); 1257 if (err) 1258 return err; 1259 } else { 1260 return -EOPNOTSUPP; 1261 } 1262 } 1263 1264 if (ifindex) { 1265 master_dev = __dev_get_by_index(dev_net(dev), ifindex); 1266 if (!master_dev) 1267 return -EINVAL; 1268 ops = master_dev->netdev_ops; 1269 if (ops->ndo_add_slave) { 1270 err = ops->ndo_add_slave(master_dev, dev); 1271 if (err) 1272 return err; 1273 } else { 1274 return -EOPNOTSUPP; 1275 } 1276 } 1277 return 0; 1278} 1279 1280static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1281 struct nlattr **tb, char *ifname, int modified) 1282{ 1283 const struct net_device_ops *ops = dev->netdev_ops; 1284 int send_addr_notify = 0; 1285 int err; 1286 1287 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1288 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1289 if (IS_ERR(net)) { 1290 err = PTR_ERR(net); 1291 goto errout; 1292 } 1293 err = dev_change_net_namespace(dev, net, ifname); 1294 put_net(net); 1295 if (err) 1296 goto errout; 1297 modified = 1; 1298 } 1299 1300 if (tb[IFLA_MAP]) { 1301 struct rtnl_link_ifmap *u_map; 1302 struct ifmap k_map; 1303 1304 if (!ops->ndo_set_config) { 1305 err = -EOPNOTSUPP; 1306 goto errout; 1307 } 1308 1309 if (!netif_device_present(dev)) { 1310 err = -ENODEV; 1311 goto errout; 1312 } 1313 1314 u_map = nla_data(tb[IFLA_MAP]); 1315 k_map.mem_start = (unsigned long) u_map->mem_start; 1316 k_map.mem_end = (unsigned long) u_map->mem_end; 1317 k_map.base_addr = (unsigned short) u_map->base_addr; 1318 k_map.irq = (unsigned char) u_map->irq; 1319 k_map.dma = (unsigned char) u_map->dma; 1320 k_map.port = (unsigned char) u_map->port; 1321 1322 err = ops->ndo_set_config(dev, &k_map); 1323 if (err < 0) 1324 goto errout; 1325 1326 modified = 1; 1327 } 1328 1329 if (tb[IFLA_ADDRESS]) { 1330 struct sockaddr *sa; 1331 int len; 1332 1333 if (!ops->ndo_set_mac_address) { 1334 err = -EOPNOTSUPP; 1335 goto errout; 1336 } 1337 1338 if (!netif_device_present(dev)) { 1339 err = -ENODEV; 1340 goto errout; 1341 } 1342 1343 len = sizeof(sa_family_t) + dev->addr_len; 1344 sa = kmalloc(len, GFP_KERNEL); 1345 if (!sa) { 1346 err = -ENOMEM; 1347 goto errout; 1348 } 1349 sa->sa_family = dev->type; 1350 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1351 dev->addr_len); 1352 err = ops->ndo_set_mac_address(dev, sa); 1353 kfree(sa); 1354 if (err) 1355 goto errout; 1356 send_addr_notify = 1; 1357 modified = 1; 1358 } 1359 1360 if (tb[IFLA_MTU]) { 1361 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1362 if (err < 0) 1363 goto errout; 1364 modified = 1; 1365 } 1366 1367 if (tb[IFLA_GROUP]) { 1368 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1369 modified = 1; 1370 } 1371 1372 /* 1373 * Interface selected by interface index but interface 1374 * name provided implies that a name change has been 1375 * requested. 1376 */ 1377 if (ifm->ifi_index > 0 && ifname[0]) { 1378 err = dev_change_name(dev, ifname); 1379 if (err < 0) 1380 goto errout; 1381 modified = 1; 1382 } 1383 1384 if (tb[IFLA_IFALIAS]) { 1385 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1386 nla_len(tb[IFLA_IFALIAS])); 1387 if (err < 0) 1388 goto errout; 1389 modified = 1; 1390 } 1391 1392 if (tb[IFLA_BROADCAST]) { 1393 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1394 send_addr_notify = 1; 1395 } 1396 1397 if (ifm->ifi_flags || ifm->ifi_change) { 1398 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1399 if (err < 0) 1400 goto errout; 1401 } 1402 1403 if (tb[IFLA_MASTER]) { 1404 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1405 if (err) 1406 goto errout; 1407 modified = 1; 1408 } 1409 1410 if (tb[IFLA_TXQLEN]) 1411 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1412 1413 if (tb[IFLA_OPERSTATE]) 1414 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1415 1416 if (tb[IFLA_LINKMODE]) { 1417 write_lock_bh(&dev_base_lock); 1418 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1419 write_unlock_bh(&dev_base_lock); 1420 } 1421 1422 if (tb[IFLA_VFINFO_LIST]) { 1423 struct nlattr *attr; 1424 int rem; 1425 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1426 if (nla_type(attr) != IFLA_VF_INFO) { 1427 err = -EINVAL; 1428 goto errout; 1429 } 1430 err = do_setvfinfo(dev, attr); 1431 if (err < 0) 1432 goto errout; 1433 modified = 1; 1434 } 1435 } 1436 err = 0; 1437 1438 if (tb[IFLA_VF_PORTS]) { 1439 struct nlattr *port[IFLA_PORT_MAX+1]; 1440 struct nlattr *attr; 1441 int vf; 1442 int rem; 1443 1444 err = -EOPNOTSUPP; 1445 if (!ops->ndo_set_vf_port) 1446 goto errout; 1447 1448 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1449 if (nla_type(attr) != IFLA_VF_PORT) 1450 continue; 1451 err = nla_parse_nested(port, IFLA_PORT_MAX, 1452 attr, ifla_port_policy); 1453 if (err < 0) 1454 goto errout; 1455 if (!port[IFLA_PORT_VF]) { 1456 err = -EOPNOTSUPP; 1457 goto errout; 1458 } 1459 vf = nla_get_u32(port[IFLA_PORT_VF]); 1460 err = ops->ndo_set_vf_port(dev, vf, port); 1461 if (err < 0) 1462 goto errout; 1463 modified = 1; 1464 } 1465 } 1466 err = 0; 1467 1468 if (tb[IFLA_PORT_SELF]) { 1469 struct nlattr *port[IFLA_PORT_MAX+1]; 1470 1471 err = nla_parse_nested(port, IFLA_PORT_MAX, 1472 tb[IFLA_PORT_SELF], ifla_port_policy); 1473 if (err < 0) 1474 goto errout; 1475 1476 err = -EOPNOTSUPP; 1477 if (ops->ndo_set_vf_port) 1478 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1479 if (err < 0) 1480 goto errout; 1481 modified = 1; 1482 } 1483 1484 if (tb[IFLA_AF_SPEC]) { 1485 struct nlattr *af; 1486 int rem; 1487 1488 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1489 const struct rtnl_af_ops *af_ops; 1490 1491 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1492 BUG(); 1493 1494 err = af_ops->set_link_af(dev, af); 1495 if (err < 0) 1496 goto errout; 1497 1498 modified = 1; 1499 } 1500 } 1501 err = 0; 1502 1503errout: 1504 if (err < 0 && modified && net_ratelimit()) 1505 printk(KERN_WARNING "A link change request failed with " 1506 "some changes committed already. Interface %s may " 1507 "have been left with an inconsistent configuration, " 1508 "please check.\n", dev->name); 1509 1510 if (send_addr_notify) 1511 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1512 min_ifinfo_dump_size = max_t(u16, if_nlmsg_size(dev), 1513 min_ifinfo_dump_size); 1514 1515 return err; 1516} 1517 1518static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1519{ 1520 struct net *net = sock_net(skb->sk); 1521 struct ifinfomsg *ifm; 1522 struct net_device *dev; 1523 int err; 1524 struct nlattr *tb[IFLA_MAX+1]; 1525 char ifname[IFNAMSIZ]; 1526 1527 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1528 if (err < 0) 1529 goto errout; 1530 1531 if (tb[IFLA_IFNAME]) 1532 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1533 else 1534 ifname[0] = '\0'; 1535 1536 err = -EINVAL; 1537 ifm = nlmsg_data(nlh); 1538 if (ifm->ifi_index > 0) 1539 dev = __dev_get_by_index(net, ifm->ifi_index); 1540 else if (tb[IFLA_IFNAME]) 1541 dev = __dev_get_by_name(net, ifname); 1542 else 1543 goto errout; 1544 1545 if (dev == NULL) { 1546 err = -ENODEV; 1547 goto errout; 1548 } 1549 1550 err = validate_linkmsg(dev, tb); 1551 if (err < 0) 1552 goto errout; 1553 1554 err = do_setlink(dev, ifm, tb, ifname, 0); 1555errout: 1556 return err; 1557} 1558 1559static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1560{ 1561 struct net *net = sock_net(skb->sk); 1562 const struct rtnl_link_ops *ops; 1563 struct net_device *dev; 1564 struct ifinfomsg *ifm; 1565 char ifname[IFNAMSIZ]; 1566 struct nlattr *tb[IFLA_MAX+1]; 1567 int err; 1568 LIST_HEAD(list_kill); 1569 1570 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1571 if (err < 0) 1572 return err; 1573 1574 if (tb[IFLA_IFNAME]) 1575 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1576 1577 ifm = nlmsg_data(nlh); 1578 if (ifm->ifi_index > 0) 1579 dev = __dev_get_by_index(net, ifm->ifi_index); 1580 else if (tb[IFLA_IFNAME]) 1581 dev = __dev_get_by_name(net, ifname); 1582 else 1583 return -EINVAL; 1584 1585 if (!dev) 1586 return -ENODEV; 1587 1588 ops = dev->rtnl_link_ops; 1589 if (!ops) 1590 return -EOPNOTSUPP; 1591 1592 ops->dellink(dev, &list_kill); 1593 unregister_netdevice_many(&list_kill); 1594 list_del(&list_kill); 1595 return 0; 1596} 1597 1598int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1599{ 1600 unsigned int old_flags; 1601 int err; 1602 1603 old_flags = dev->flags; 1604 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1605 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1606 if (err < 0) 1607 return err; 1608 } 1609 1610 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1611 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1612 1613 __dev_notify_flags(dev, old_flags); 1614 return 0; 1615} 1616EXPORT_SYMBOL(rtnl_configure_link); 1617 1618struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1619 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1620{ 1621 int err; 1622 struct net_device *dev; 1623 unsigned int num_queues = 1; 1624 unsigned int real_num_queues = 1; 1625 1626 if (ops->get_tx_queues) { 1627 err = ops->get_tx_queues(src_net, tb, &num_queues, 1628 &real_num_queues); 1629 if (err) 1630 goto err; 1631 } 1632 err = -ENOMEM; 1633 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1634 if (!dev) 1635 goto err; 1636 1637 dev_net_set(dev, net); 1638 dev->rtnl_link_ops = ops; 1639 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1640 1641 if (tb[IFLA_MTU]) 1642 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1643 if (tb[IFLA_ADDRESS]) 1644 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1645 nla_len(tb[IFLA_ADDRESS])); 1646 if (tb[IFLA_BROADCAST]) 1647 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1648 nla_len(tb[IFLA_BROADCAST])); 1649 if (tb[IFLA_TXQLEN]) 1650 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1651 if (tb[IFLA_OPERSTATE]) 1652 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1653 if (tb[IFLA_LINKMODE]) 1654 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1655 if (tb[IFLA_GROUP]) 1656 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1657 1658 return dev; 1659 1660err: 1661 return ERR_PTR(err); 1662} 1663EXPORT_SYMBOL(rtnl_create_link); 1664 1665static int rtnl_group_changelink(struct net *net, int group, 1666 struct ifinfomsg *ifm, 1667 struct nlattr **tb) 1668{ 1669 struct net_device *dev; 1670 int err; 1671 1672 for_each_netdev(net, dev) { 1673 if (dev->group == group) { 1674 err = do_setlink(dev, ifm, tb, NULL, 0); 1675 if (err < 0) 1676 return err; 1677 } 1678 } 1679 1680 return 0; 1681} 1682 1683static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1684{ 1685 struct net *net = sock_net(skb->sk); 1686 const struct rtnl_link_ops *ops; 1687 struct net_device *dev; 1688 struct ifinfomsg *ifm; 1689 char kind[MODULE_NAME_LEN]; 1690 char ifname[IFNAMSIZ]; 1691 struct nlattr *tb[IFLA_MAX+1]; 1692 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1693 int err; 1694 1695#ifdef CONFIG_MODULES 1696replay: 1697#endif 1698 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1699 if (err < 0) 1700 return err; 1701 1702 if (tb[IFLA_IFNAME]) 1703 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1704 else 1705 ifname[0] = '\0'; 1706 1707 ifm = nlmsg_data(nlh); 1708 if (ifm->ifi_index > 0) 1709 dev = __dev_get_by_index(net, ifm->ifi_index); 1710 else { 1711 if (ifname[0]) 1712 dev = __dev_get_by_name(net, ifname); 1713 else 1714 dev = NULL; 1715 } 1716 1717 err = validate_linkmsg(dev, tb); 1718 if (err < 0) 1719 return err; 1720 1721 if (tb[IFLA_LINKINFO]) { 1722 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1723 tb[IFLA_LINKINFO], ifla_info_policy); 1724 if (err < 0) 1725 return err; 1726 } else 1727 memset(linkinfo, 0, sizeof(linkinfo)); 1728 1729 if (linkinfo[IFLA_INFO_KIND]) { 1730 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1731 ops = rtnl_link_ops_get(kind); 1732 } else { 1733 kind[0] = '\0'; 1734 ops = NULL; 1735 } 1736 1737 if (1) { 1738 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1739 struct net *dest_net; 1740 1741 if (ops) { 1742 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1743 err = nla_parse_nested(attr, ops->maxtype, 1744 linkinfo[IFLA_INFO_DATA], 1745 ops->policy); 1746 if (err < 0) 1747 return err; 1748 data = attr; 1749 } 1750 if (ops->validate) { 1751 err = ops->validate(tb, data); 1752 if (err < 0) 1753 return err; 1754 } 1755 } 1756 1757 if (dev) { 1758 int modified = 0; 1759 1760 if (nlh->nlmsg_flags & NLM_F_EXCL) 1761 return -EEXIST; 1762 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1763 return -EOPNOTSUPP; 1764 1765 if (linkinfo[IFLA_INFO_DATA]) { 1766 if (!ops || ops != dev->rtnl_link_ops || 1767 !ops->changelink) 1768 return -EOPNOTSUPP; 1769 1770 err = ops->changelink(dev, tb, data); 1771 if (err < 0) 1772 return err; 1773 modified = 1; 1774 } 1775 1776 return do_setlink(dev, ifm, tb, ifname, modified); 1777 } 1778 1779 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1780 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1781 return rtnl_group_changelink(net, 1782 nla_get_u32(tb[IFLA_GROUP]), 1783 ifm, tb); 1784 return -ENODEV; 1785 } 1786 1787 if (ifm->ifi_index) 1788 return -EOPNOTSUPP; 1789 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1790 return -EOPNOTSUPP; 1791 1792 if (!ops) { 1793#ifdef CONFIG_MODULES 1794 if (kind[0]) { 1795 __rtnl_unlock(); 1796 request_module("rtnl-link-%s", kind); 1797 rtnl_lock(); 1798 ops = rtnl_link_ops_get(kind); 1799 if (ops) 1800 goto replay; 1801 } 1802#endif 1803 return -EOPNOTSUPP; 1804 } 1805 1806 if (!ifname[0]) 1807 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1808 1809 dest_net = rtnl_link_get_net(net, tb); 1810 if (IS_ERR(dest_net)) 1811 return PTR_ERR(dest_net); 1812 1813 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1814 1815 if (IS_ERR(dev)) 1816 err = PTR_ERR(dev); 1817 else if (ops->newlink) 1818 err = ops->newlink(net, dev, tb, data); 1819 else 1820 err = register_netdevice(dev); 1821 1822 if (err < 0 && !IS_ERR(dev)) 1823 free_netdev(dev); 1824 if (err < 0) 1825 goto out; 1826 1827 err = rtnl_configure_link(dev, ifm); 1828 if (err < 0) 1829 unregister_netdevice(dev); 1830out: 1831 put_net(dest_net); 1832 return err; 1833 } 1834} 1835 1836static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1837{ 1838 struct net *net = sock_net(skb->sk); 1839 struct ifinfomsg *ifm; 1840 char ifname[IFNAMSIZ]; 1841 struct nlattr *tb[IFLA_MAX+1]; 1842 struct net_device *dev = NULL; 1843 struct sk_buff *nskb; 1844 int err; 1845 1846 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1847 if (err < 0) 1848 return err; 1849 1850 if (tb[IFLA_IFNAME]) 1851 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1852 1853 ifm = nlmsg_data(nlh); 1854 if (ifm->ifi_index > 0) 1855 dev = __dev_get_by_index(net, ifm->ifi_index); 1856 else if (tb[IFLA_IFNAME]) 1857 dev = __dev_get_by_name(net, ifname); 1858 else 1859 return -EINVAL; 1860 1861 if (dev == NULL) 1862 return -ENODEV; 1863 1864 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1865 if (nskb == NULL) 1866 return -ENOBUFS; 1867 1868 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1869 nlh->nlmsg_seq, 0, 0); 1870 if (err < 0) { 1871 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1872 WARN_ON(err == -EMSGSIZE); 1873 kfree_skb(nskb); 1874 } else 1875 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1876 1877 return err; 1878} 1879 1880static u16 rtnl_calcit(struct sk_buff *skb) 1881{ 1882 return min_ifinfo_dump_size; 1883} 1884 1885static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1886{ 1887 int idx; 1888 int s_idx = cb->family; 1889 1890 if (s_idx == 0) 1891 s_idx = 1; 1892 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1893 int type = cb->nlh->nlmsg_type-RTM_BASE; 1894 if (idx < s_idx || idx == PF_PACKET) 1895 continue; 1896 if (rtnl_msg_handlers[idx] == NULL || 1897 rtnl_msg_handlers[idx][type].dumpit == NULL) 1898 continue; 1899 if (idx > s_idx) 1900 memset(&cb->args[0], 0, sizeof(cb->args)); 1901 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1902 break; 1903 } 1904 cb->family = idx; 1905 1906 return skb->len; 1907} 1908 1909void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1910{ 1911 struct net *net = dev_net(dev); 1912 struct sk_buff *skb; 1913 int err = -ENOBUFS; 1914 size_t if_info_size; 1915 1916 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev)), GFP_KERNEL); 1917 if (skb == NULL) 1918 goto errout; 1919 1920 min_ifinfo_dump_size = max_t(u16, if_info_size, min_ifinfo_dump_size); 1921 1922 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1923 if (err < 0) { 1924 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1925 WARN_ON(err == -EMSGSIZE); 1926 kfree_skb(skb); 1927 goto errout; 1928 } 1929 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1930 return; 1931errout: 1932 if (err < 0) 1933 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1934} 1935 1936/* Protected by RTNL sempahore. */ 1937static struct rtattr **rta_buf; 1938static int rtattr_max; 1939 1940/* Process one rtnetlink message. */ 1941 1942static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1943{ 1944 struct net *net = sock_net(skb->sk); 1945 rtnl_doit_func doit; 1946 int sz_idx, kind; 1947 int min_len; 1948 int family; 1949 int type; 1950 int err; 1951 1952 type = nlh->nlmsg_type; 1953 if (type > RTM_MAX) 1954 return -EOPNOTSUPP; 1955 1956 type -= RTM_BASE; 1957 1958 /* All the messages must have at least 1 byte length */ 1959 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1960 return 0; 1961 1962 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1963 sz_idx = type>>2; 1964 kind = type&3; 1965 1966 if (kind != 2 && !capable(CAP_NET_ADMIN)) 1967 return -EPERM; 1968 1969 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1970 struct sock *rtnl; 1971 rtnl_dumpit_func dumpit; 1972 rtnl_calcit_func calcit; 1973 u16 min_dump_alloc = 0; 1974 1975 dumpit = rtnl_get_dumpit(family, type); 1976 if (dumpit == NULL) 1977 return -EOPNOTSUPP; 1978 calcit = rtnl_get_calcit(family, type); 1979 if (calcit) 1980 min_dump_alloc = calcit(skb); 1981 1982 __rtnl_unlock(); 1983 rtnl = net->rtnl; 1984 err = netlink_dump_start(rtnl, skb, nlh, dumpit, 1985 NULL, min_dump_alloc); 1986 rtnl_lock(); 1987 return err; 1988 } 1989 1990 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1991 1992 min_len = rtm_min[sz_idx]; 1993 if (nlh->nlmsg_len < min_len) 1994 return -EINVAL; 1995 1996 if (nlh->nlmsg_len > min_len) { 1997 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1998 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1999 2000 while (RTA_OK(attr, attrlen)) { 2001 unsigned flavor = attr->rta_type; 2002 if (flavor) { 2003 if (flavor > rta_max[sz_idx]) 2004 return -EINVAL; 2005 rta_buf[flavor-1] = attr; 2006 } 2007 attr = RTA_NEXT(attr, attrlen); 2008 } 2009 } 2010 2011 doit = rtnl_get_doit(family, type); 2012 if (doit == NULL) 2013 return -EOPNOTSUPP; 2014 2015 return doit(skb, nlh, (void *)&rta_buf[0]); 2016} 2017 2018static void rtnetlink_rcv(struct sk_buff *skb) 2019{ 2020 rtnl_lock(); 2021 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2022 rtnl_unlock(); 2023} 2024 2025static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2026{ 2027 struct net_device *dev = ptr; 2028 2029 switch (event) { 2030 case NETDEV_UP: 2031 case NETDEV_DOWN: 2032 case NETDEV_PRE_UP: 2033 case NETDEV_POST_INIT: 2034 case NETDEV_REGISTER: 2035 case NETDEV_CHANGE: 2036 case NETDEV_PRE_TYPE_CHANGE: 2037 case NETDEV_GOING_DOWN: 2038 case NETDEV_UNREGISTER: 2039 case NETDEV_UNREGISTER_BATCH: 2040 case NETDEV_RELEASE: 2041 case NETDEV_JOIN: 2042 break; 2043 default: 2044 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2045 break; 2046 } 2047 return NOTIFY_DONE; 2048} 2049 2050static struct notifier_block rtnetlink_dev_notifier = { 2051 .notifier_call = rtnetlink_event, 2052}; 2053 2054 2055static int __net_init rtnetlink_net_init(struct net *net) 2056{ 2057 struct sock *sk; 2058 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 2059 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 2060 if (!sk) 2061 return -ENOMEM; 2062 net->rtnl = sk; 2063 return 0; 2064} 2065 2066static void __net_exit rtnetlink_net_exit(struct net *net) 2067{ 2068 netlink_kernel_release(net->rtnl); 2069 net->rtnl = NULL; 2070} 2071 2072static struct pernet_operations rtnetlink_net_ops = { 2073 .init = rtnetlink_net_init, 2074 .exit = rtnetlink_net_exit, 2075}; 2076 2077void __init rtnetlink_init(void) 2078{ 2079 int i; 2080 2081 rtattr_max = 0; 2082 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 2083 if (rta_max[i] > rtattr_max) 2084 rtattr_max = rta_max[i]; 2085 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 2086 if (!rta_buf) 2087 panic("rtnetlink_init: cannot allocate rta_buf\n"); 2088 2089 if (register_pernet_subsys(&rtnetlink_net_ops)) 2090 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2091 2092 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 2093 register_netdevice_notifier(&rtnetlink_dev_notifier); 2094 2095 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2096 rtnl_dump_ifinfo, rtnl_calcit); 2097 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2098 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2099 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2100 2101 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2102 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2103} 2104 2105