rtnetlink.c revision 10708f37ae729baba9b67bd134c3720709d4ae62
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}; 60 61static DEFINE_MUTEX(rtnl_mutex); 62 63void rtnl_lock(void) 64{ 65 mutex_lock(&rtnl_mutex); 66} 67EXPORT_SYMBOL(rtnl_lock); 68 69void __rtnl_unlock(void) 70{ 71 mutex_unlock(&rtnl_mutex); 72} 73 74void rtnl_unlock(void) 75{ 76 /* This fellow will unlock it for us. */ 77 netdev_run_todo(); 78} 79EXPORT_SYMBOL(rtnl_unlock); 80 81int rtnl_trylock(void) 82{ 83 return mutex_trylock(&rtnl_mutex); 84} 85EXPORT_SYMBOL(rtnl_trylock); 86 87int rtnl_is_locked(void) 88{ 89 return mutex_is_locked(&rtnl_mutex); 90} 91EXPORT_SYMBOL(rtnl_is_locked); 92 93#ifdef CONFIG_PROVE_LOCKING 94int lockdep_rtnl_is_held(void) 95{ 96 return lockdep_is_held(&rtnl_mutex); 97} 98EXPORT_SYMBOL(lockdep_rtnl_is_held); 99#endif /* #ifdef CONFIG_PROVE_LOCKING */ 100 101static struct rtnl_link *rtnl_msg_handlers[NPROTO]; 102 103static inline int rtm_msgindex(int msgtype) 104{ 105 int msgindex = msgtype - RTM_BASE; 106 107 /* 108 * msgindex < 0 implies someone tried to register a netlink 109 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 110 * the message type has not been added to linux/rtnetlink.h 111 */ 112 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 113 114 return msgindex; 115} 116 117static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 118{ 119 struct rtnl_link *tab; 120 121 tab = rtnl_msg_handlers[protocol]; 122 if (tab == NULL || tab[msgindex].doit == NULL) 123 tab = rtnl_msg_handlers[PF_UNSPEC]; 124 125 return tab ? tab[msgindex].doit : NULL; 126} 127 128static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 129{ 130 struct rtnl_link *tab; 131 132 tab = rtnl_msg_handlers[protocol]; 133 if (tab == NULL || tab[msgindex].dumpit == NULL) 134 tab = rtnl_msg_handlers[PF_UNSPEC]; 135 136 return tab ? tab[msgindex].dumpit : NULL; 137} 138 139/** 140 * __rtnl_register - Register a rtnetlink message type 141 * @protocol: Protocol family or PF_UNSPEC 142 * @msgtype: rtnetlink message type 143 * @doit: Function pointer called for each request message 144 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 145 * 146 * Registers the specified function pointers (at least one of them has 147 * to be non-NULL) to be called whenever a request message for the 148 * specified protocol family and message type is received. 149 * 150 * The special protocol family PF_UNSPEC may be used to define fallback 151 * function pointers for the case when no entry for the specific protocol 152 * family exists. 153 * 154 * Returns 0 on success or a negative error code. 155 */ 156int __rtnl_register(int protocol, int msgtype, 157 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 158{ 159 struct rtnl_link *tab; 160 int msgindex; 161 162 BUG_ON(protocol < 0 || protocol >= NPROTO); 163 msgindex = rtm_msgindex(msgtype); 164 165 tab = rtnl_msg_handlers[protocol]; 166 if (tab == NULL) { 167 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 168 if (tab == NULL) 169 return -ENOBUFS; 170 171 rtnl_msg_handlers[protocol] = tab; 172 } 173 174 if (doit) 175 tab[msgindex].doit = doit; 176 177 if (dumpit) 178 tab[msgindex].dumpit = dumpit; 179 180 return 0; 181} 182EXPORT_SYMBOL_GPL(__rtnl_register); 183 184/** 185 * rtnl_register - Register a rtnetlink message type 186 * 187 * Identical to __rtnl_register() but panics on failure. This is useful 188 * as failure of this function is very unlikely, it can only happen due 189 * to lack of memory when allocating the chain to store all message 190 * handlers for a protocol. Meant for use in init functions where lack 191 * of memory implies no sense in continueing. 192 */ 193void rtnl_register(int protocol, int msgtype, 194 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 195{ 196 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 197 panic("Unable to register rtnetlink message handler, " 198 "protocol = %d, message type = %d\n", 199 protocol, msgtype); 200} 201EXPORT_SYMBOL_GPL(rtnl_register); 202 203/** 204 * rtnl_unregister - Unregister a rtnetlink message type 205 * @protocol: Protocol family or PF_UNSPEC 206 * @msgtype: rtnetlink message type 207 * 208 * Returns 0 on success or a negative error code. 209 */ 210int rtnl_unregister(int protocol, int msgtype) 211{ 212 int msgindex; 213 214 BUG_ON(protocol < 0 || protocol >= NPROTO); 215 msgindex = rtm_msgindex(msgtype); 216 217 if (rtnl_msg_handlers[protocol] == NULL) 218 return -ENOENT; 219 220 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 221 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 222 223 return 0; 224} 225EXPORT_SYMBOL_GPL(rtnl_unregister); 226 227/** 228 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 229 * @protocol : Protocol family or PF_UNSPEC 230 * 231 * Identical to calling rtnl_unregster() for all registered message types 232 * of a certain protocol family. 233 */ 234void rtnl_unregister_all(int protocol) 235{ 236 BUG_ON(protocol < 0 || protocol >= NPROTO); 237 238 kfree(rtnl_msg_handlers[protocol]); 239 rtnl_msg_handlers[protocol] = NULL; 240} 241EXPORT_SYMBOL_GPL(rtnl_unregister_all); 242 243static LIST_HEAD(link_ops); 244 245/** 246 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 247 * @ops: struct rtnl_link_ops * to register 248 * 249 * The caller must hold the rtnl_mutex. This function should be used 250 * by drivers that create devices during module initialization. It 251 * must be called before registering the devices. 252 * 253 * Returns 0 on success or a negative error code. 254 */ 255int __rtnl_link_register(struct rtnl_link_ops *ops) 256{ 257 if (!ops->dellink) 258 ops->dellink = unregister_netdevice_queue; 259 260 list_add_tail(&ops->list, &link_ops); 261 return 0; 262} 263EXPORT_SYMBOL_GPL(__rtnl_link_register); 264 265/** 266 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 267 * @ops: struct rtnl_link_ops * to register 268 * 269 * Returns 0 on success or a negative error code. 270 */ 271int rtnl_link_register(struct rtnl_link_ops *ops) 272{ 273 int err; 274 275 rtnl_lock(); 276 err = __rtnl_link_register(ops); 277 rtnl_unlock(); 278 return err; 279} 280EXPORT_SYMBOL_GPL(rtnl_link_register); 281 282static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 283{ 284 struct net_device *dev; 285 LIST_HEAD(list_kill); 286 287 for_each_netdev(net, dev) { 288 if (dev->rtnl_link_ops == ops) 289 ops->dellink(dev, &list_kill); 290 } 291 unregister_netdevice_many(&list_kill); 292} 293 294void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 295{ 296 rtnl_lock(); 297 __rtnl_kill_links(net, ops); 298 rtnl_unlock(); 299} 300EXPORT_SYMBOL_GPL(rtnl_kill_links); 301 302/** 303 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 304 * @ops: struct rtnl_link_ops * to unregister 305 * 306 * The caller must hold the rtnl_mutex. 307 */ 308void __rtnl_link_unregister(struct rtnl_link_ops *ops) 309{ 310 struct net *net; 311 312 for_each_net(net) { 313 __rtnl_kill_links(net, ops); 314 } 315 list_del(&ops->list); 316} 317EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 318 319/** 320 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 321 * @ops: struct rtnl_link_ops * to unregister 322 */ 323void rtnl_link_unregister(struct rtnl_link_ops *ops) 324{ 325 rtnl_lock(); 326 __rtnl_link_unregister(ops); 327 rtnl_unlock(); 328} 329EXPORT_SYMBOL_GPL(rtnl_link_unregister); 330 331static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 332{ 333 const struct rtnl_link_ops *ops; 334 335 list_for_each_entry(ops, &link_ops, list) { 336 if (!strcmp(ops->kind, kind)) 337 return ops; 338 } 339 return NULL; 340} 341 342static size_t rtnl_link_get_size(const struct net_device *dev) 343{ 344 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 345 size_t size; 346 347 if (!ops) 348 return 0; 349 350 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 351 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 352 353 if (ops->get_size) 354 /* IFLA_INFO_DATA + nested data */ 355 size += nlmsg_total_size(sizeof(struct nlattr)) + 356 ops->get_size(dev); 357 358 if (ops->get_xstats_size) 359 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ 360 361 return size; 362} 363 364static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 365{ 366 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 367 struct nlattr *linkinfo, *data; 368 int err = -EMSGSIZE; 369 370 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 371 if (linkinfo == NULL) 372 goto out; 373 374 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 375 goto err_cancel_link; 376 if (ops->fill_xstats) { 377 err = ops->fill_xstats(skb, dev); 378 if (err < 0) 379 goto err_cancel_link; 380 } 381 if (ops->fill_info) { 382 data = nla_nest_start(skb, IFLA_INFO_DATA); 383 if (data == NULL) 384 goto err_cancel_link; 385 err = ops->fill_info(skb, dev); 386 if (err < 0) 387 goto err_cancel_data; 388 nla_nest_end(skb, data); 389 } 390 391 nla_nest_end(skb, linkinfo); 392 return 0; 393 394err_cancel_data: 395 nla_nest_cancel(skb, data); 396err_cancel_link: 397 nla_nest_cancel(skb, linkinfo); 398out: 399 return err; 400} 401 402static const int rtm_min[RTM_NR_FAMILIES] = 403{ 404 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 405 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 406 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 407 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 408 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 409 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 410 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 411 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 412 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 413 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 414}; 415 416static const int rta_max[RTM_NR_FAMILIES] = 417{ 418 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 419 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 420 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 421 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 422 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 423 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 424 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 425 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 426}; 427 428void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 429{ 430 struct rtattr *rta; 431 int size = RTA_LENGTH(attrlen); 432 433 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); 434 rta->rta_type = attrtype; 435 rta->rta_len = size; 436 memcpy(RTA_DATA(rta), data, attrlen); 437 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 438} 439EXPORT_SYMBOL(__rta_fill); 440 441int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 442{ 443 struct sock *rtnl = net->rtnl; 444 int err = 0; 445 446 NETLINK_CB(skb).dst_group = group; 447 if (echo) 448 atomic_inc(&skb->users); 449 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 450 if (echo) 451 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 452 return err; 453} 454 455int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 456{ 457 struct sock *rtnl = net->rtnl; 458 459 return nlmsg_unicast(rtnl, skb, pid); 460} 461EXPORT_SYMBOL(rtnl_unicast); 462 463void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 464 struct nlmsghdr *nlh, gfp_t flags) 465{ 466 struct sock *rtnl = net->rtnl; 467 int report = 0; 468 469 if (nlh) 470 report = nlmsg_report(nlh); 471 472 nlmsg_notify(rtnl, skb, pid, group, report, flags); 473} 474EXPORT_SYMBOL(rtnl_notify); 475 476void rtnl_set_sk_err(struct net *net, u32 group, int error) 477{ 478 struct sock *rtnl = net->rtnl; 479 480 netlink_set_err(rtnl, 0, group, error); 481} 482EXPORT_SYMBOL(rtnl_set_sk_err); 483 484int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 485{ 486 struct nlattr *mx; 487 int i, valid = 0; 488 489 mx = nla_nest_start(skb, RTA_METRICS); 490 if (mx == NULL) 491 return -ENOBUFS; 492 493 for (i = 0; i < RTAX_MAX; i++) { 494 if (metrics[i]) { 495 valid++; 496 NLA_PUT_U32(skb, i+1, metrics[i]); 497 } 498 } 499 500 if (!valid) { 501 nla_nest_cancel(skb, mx); 502 return 0; 503 } 504 505 return nla_nest_end(skb, mx); 506 507nla_put_failure: 508 nla_nest_cancel(skb, mx); 509 return -EMSGSIZE; 510} 511EXPORT_SYMBOL(rtnetlink_put_metrics); 512 513int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 514 u32 ts, u32 tsage, long expires, u32 error) 515{ 516 struct rta_cacheinfo ci = { 517 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 518 .rta_used = dst->__use, 519 .rta_clntref = atomic_read(&(dst->__refcnt)), 520 .rta_error = error, 521 .rta_id = id, 522 .rta_ts = ts, 523 .rta_tsage = tsage, 524 }; 525 526 if (expires) 527 ci.rta_expires = jiffies_to_clock_t(expires); 528 529 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 530} 531EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 532 533static void set_operstate(struct net_device *dev, unsigned char transition) 534{ 535 unsigned char operstate = dev->operstate; 536 537 switch (transition) { 538 case IF_OPER_UP: 539 if ((operstate == IF_OPER_DORMANT || 540 operstate == IF_OPER_UNKNOWN) && 541 !netif_dormant(dev)) 542 operstate = IF_OPER_UP; 543 break; 544 545 case IF_OPER_DORMANT: 546 if (operstate == IF_OPER_UP || 547 operstate == IF_OPER_UNKNOWN) 548 operstate = IF_OPER_DORMANT; 549 break; 550 } 551 552 if (dev->operstate != operstate) { 553 write_lock_bh(&dev_base_lock); 554 dev->operstate = operstate; 555 write_unlock_bh(&dev_base_lock); 556 netdev_state_change(dev); 557 } 558} 559 560static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 561 const struct ifinfomsg *ifm) 562{ 563 unsigned int flags = ifm->ifi_flags; 564 565 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 566 if (ifm->ifi_change) 567 flags = (flags & ifm->ifi_change) | 568 (dev->flags & ~ifm->ifi_change); 569 570 return flags; 571} 572 573static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 574 const struct net_device_stats *b) 575{ 576 a->rx_packets = b->rx_packets; 577 a->tx_packets = b->tx_packets; 578 a->rx_bytes = b->rx_bytes; 579 a->tx_bytes = b->tx_bytes; 580 a->rx_errors = b->rx_errors; 581 a->tx_errors = b->tx_errors; 582 a->rx_dropped = b->rx_dropped; 583 a->tx_dropped = b->tx_dropped; 584 585 a->multicast = b->multicast; 586 a->collisions = b->collisions; 587 588 a->rx_length_errors = b->rx_length_errors; 589 a->rx_over_errors = b->rx_over_errors; 590 a->rx_crc_errors = b->rx_crc_errors; 591 a->rx_frame_errors = b->rx_frame_errors; 592 a->rx_fifo_errors = b->rx_fifo_errors; 593 a->rx_missed_errors = b->rx_missed_errors; 594 595 a->tx_aborted_errors = b->tx_aborted_errors; 596 a->tx_carrier_errors = b->tx_carrier_errors; 597 a->tx_fifo_errors = b->tx_fifo_errors; 598 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 599 a->tx_window_errors = b->tx_window_errors; 600 601 a->rx_compressed = b->rx_compressed; 602 a->tx_compressed = b->tx_compressed; 603} 604 605static void copy_rtnl_link_stats64(struct rtnl_link_stats64 *a, 606 const struct net_device_stats *b) 607{ 608 a->rx_packets = b->rx_packets; 609 a->tx_packets = b->tx_packets; 610 a->rx_bytes = b->rx_bytes; 611 a->tx_bytes = b->tx_bytes; 612 a->rx_errors = b->rx_errors; 613 a->tx_errors = b->tx_errors; 614 a->rx_dropped = b->rx_dropped; 615 a->tx_dropped = b->tx_dropped; 616 617 a->multicast = b->multicast; 618 a->collisions = b->collisions; 619 620 a->rx_length_errors = b->rx_length_errors; 621 a->rx_over_errors = b->rx_over_errors; 622 a->rx_crc_errors = b->rx_crc_errors; 623 a->rx_frame_errors = b->rx_frame_errors; 624 a->rx_fifo_errors = b->rx_fifo_errors; 625 a->rx_missed_errors = b->rx_missed_errors; 626 627 a->tx_aborted_errors = b->tx_aborted_errors; 628 a->tx_carrier_errors = b->tx_carrier_errors; 629 a->tx_fifo_errors = b->tx_fifo_errors; 630 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 631 a->tx_window_errors = b->tx_window_errors; 632 633 a->rx_compressed = b->rx_compressed; 634 a->tx_compressed = b->tx_compressed; 635} 636 637static inline int rtnl_vfinfo_size(const struct net_device *dev) 638{ 639 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) 640 return dev_num_vf(dev->dev.parent) * 641 sizeof(struct ifla_vf_info); 642 else 643 return 0; 644} 645 646static inline size_t if_nlmsg_size(const struct net_device *dev) 647{ 648 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 649 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 650 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 651 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 652 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 653 + nla_total_size(sizeof(struct rtnl_link_stats)) 654 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 655 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 656 + nla_total_size(4) /* IFLA_TXQLEN */ 657 + nla_total_size(4) /* IFLA_WEIGHT */ 658 + nla_total_size(4) /* IFLA_MTU */ 659 + nla_total_size(4) /* IFLA_LINK */ 660 + nla_total_size(4) /* IFLA_MASTER */ 661 + nla_total_size(1) /* IFLA_OPERSTATE */ 662 + nla_total_size(1) /* IFLA_LINKMODE */ 663 + nla_total_size(4) /* IFLA_NUM_VF */ 664 + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */ 665 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 666} 667 668static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 669 int type, u32 pid, u32 seq, u32 change, 670 unsigned int flags) 671{ 672 struct ifinfomsg *ifm; 673 struct nlmsghdr *nlh; 674 const struct net_device_stats *stats; 675 struct nlattr *attr; 676 677 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 678 if (nlh == NULL) 679 return -EMSGSIZE; 680 681 ifm = nlmsg_data(nlh); 682 ifm->ifi_family = AF_UNSPEC; 683 ifm->__ifi_pad = 0; 684 ifm->ifi_type = dev->type; 685 ifm->ifi_index = dev->ifindex; 686 ifm->ifi_flags = dev_get_flags(dev); 687 ifm->ifi_change = change; 688 689 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 690 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 691 NLA_PUT_U8(skb, IFLA_OPERSTATE, 692 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 693 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 694 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 695 696 if (dev->ifindex != dev->iflink) 697 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 698 699 if (dev->master) 700 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 701 702 if (dev->qdisc) 703 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 704 705 if (dev->ifalias) 706 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 707 708 if (1) { 709 struct rtnl_link_ifmap map = { 710 .mem_start = dev->mem_start, 711 .mem_end = dev->mem_end, 712 .base_addr = dev->base_addr, 713 .irq = dev->irq, 714 .dma = dev->dma, 715 .port = dev->if_port, 716 }; 717 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 718 } 719 720 if (dev->addr_len) { 721 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 722 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 723 } 724 725 attr = nla_reserve(skb, IFLA_STATS, 726 sizeof(struct rtnl_link_stats)); 727 if (attr == NULL) 728 goto nla_put_failure; 729 730 stats = dev_get_stats(dev); 731 copy_rtnl_link_stats(nla_data(attr), stats); 732 733 attr = nla_reserve(skb, IFLA_STATS64, 734 sizeof(struct rtnl_link_stats64)); 735 if (attr == NULL) 736 goto nla_put_failure; 737 738 stats = dev_get_stats(dev); 739 copy_rtnl_link_stats64(nla_data(attr), stats); 740 741 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) { 742 int i; 743 struct ifla_vf_info ivi; 744 745 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); 746 for (i = 0; i < dev_num_vf(dev->dev.parent); i++) { 747 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 748 break; 749 NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi); 750 } 751 } 752 if (dev->rtnl_link_ops) { 753 if (rtnl_link_fill(skb, dev) < 0) 754 goto nla_put_failure; 755 } 756 757 return nlmsg_end(skb, nlh); 758 759nla_put_failure: 760 nlmsg_cancel(skb, nlh); 761 return -EMSGSIZE; 762} 763 764static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 765{ 766 struct net *net = sock_net(skb->sk); 767 int h, s_h; 768 int idx = 0, s_idx; 769 struct net_device *dev; 770 struct hlist_head *head; 771 struct hlist_node *node; 772 773 s_h = cb->args[0]; 774 s_idx = cb->args[1]; 775 776 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 777 idx = 0; 778 head = &net->dev_index_head[h]; 779 hlist_for_each_entry(dev, node, head, index_hlist) { 780 if (idx < s_idx) 781 goto cont; 782 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 783 NETLINK_CB(cb->skb).pid, 784 cb->nlh->nlmsg_seq, 0, 785 NLM_F_MULTI) <= 0) 786 goto out; 787cont: 788 idx++; 789 } 790 } 791out: 792 cb->args[1] = idx; 793 cb->args[0] = h; 794 795 return skb->len; 796} 797 798const struct nla_policy ifla_policy[IFLA_MAX+1] = { 799 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 800 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 801 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 802 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 803 [IFLA_MTU] = { .type = NLA_U32 }, 804 [IFLA_LINK] = { .type = NLA_U32 }, 805 [IFLA_TXQLEN] = { .type = NLA_U32 }, 806 [IFLA_WEIGHT] = { .type = NLA_U32 }, 807 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 808 [IFLA_LINKMODE] = { .type = NLA_U8 }, 809 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 810 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 811 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 812 [IFLA_VF_MAC] = { .type = NLA_BINARY, 813 .len = sizeof(struct ifla_vf_mac) }, 814 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 815 .len = sizeof(struct ifla_vf_vlan) }, 816 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 817 .len = sizeof(struct ifla_vf_tx_rate) }, 818}; 819EXPORT_SYMBOL(ifla_policy); 820 821static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 822 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 823 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 824}; 825 826struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 827{ 828 struct net *net; 829 /* Examine the link attributes and figure out which 830 * network namespace we are talking about. 831 */ 832 if (tb[IFLA_NET_NS_PID]) 833 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 834 else 835 net = get_net(src_net); 836 return net; 837} 838EXPORT_SYMBOL(rtnl_link_get_net); 839 840static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 841{ 842 if (dev) { 843 if (tb[IFLA_ADDRESS] && 844 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 845 return -EINVAL; 846 847 if (tb[IFLA_BROADCAST] && 848 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 849 return -EINVAL; 850 } 851 852 return 0; 853} 854 855static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 856 struct nlattr **tb, char *ifname, int modified) 857{ 858 const struct net_device_ops *ops = dev->netdev_ops; 859 int send_addr_notify = 0; 860 int err; 861 862 if (tb[IFLA_NET_NS_PID]) { 863 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 864 if (IS_ERR(net)) { 865 err = PTR_ERR(net); 866 goto errout; 867 } 868 err = dev_change_net_namespace(dev, net, ifname); 869 put_net(net); 870 if (err) 871 goto errout; 872 modified = 1; 873 } 874 875 if (tb[IFLA_MAP]) { 876 struct rtnl_link_ifmap *u_map; 877 struct ifmap k_map; 878 879 if (!ops->ndo_set_config) { 880 err = -EOPNOTSUPP; 881 goto errout; 882 } 883 884 if (!netif_device_present(dev)) { 885 err = -ENODEV; 886 goto errout; 887 } 888 889 u_map = nla_data(tb[IFLA_MAP]); 890 k_map.mem_start = (unsigned long) u_map->mem_start; 891 k_map.mem_end = (unsigned long) u_map->mem_end; 892 k_map.base_addr = (unsigned short) u_map->base_addr; 893 k_map.irq = (unsigned char) u_map->irq; 894 k_map.dma = (unsigned char) u_map->dma; 895 k_map.port = (unsigned char) u_map->port; 896 897 err = ops->ndo_set_config(dev, &k_map); 898 if (err < 0) 899 goto errout; 900 901 modified = 1; 902 } 903 904 if (tb[IFLA_ADDRESS]) { 905 struct sockaddr *sa; 906 int len; 907 908 if (!ops->ndo_set_mac_address) { 909 err = -EOPNOTSUPP; 910 goto errout; 911 } 912 913 if (!netif_device_present(dev)) { 914 err = -ENODEV; 915 goto errout; 916 } 917 918 len = sizeof(sa_family_t) + dev->addr_len; 919 sa = kmalloc(len, GFP_KERNEL); 920 if (!sa) { 921 err = -ENOMEM; 922 goto errout; 923 } 924 sa->sa_family = dev->type; 925 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 926 dev->addr_len); 927 err = ops->ndo_set_mac_address(dev, sa); 928 kfree(sa); 929 if (err) 930 goto errout; 931 send_addr_notify = 1; 932 modified = 1; 933 } 934 935 if (tb[IFLA_MTU]) { 936 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 937 if (err < 0) 938 goto errout; 939 modified = 1; 940 } 941 942 /* 943 * Interface selected by interface index but interface 944 * name provided implies that a name change has been 945 * requested. 946 */ 947 if (ifm->ifi_index > 0 && ifname[0]) { 948 err = dev_change_name(dev, ifname); 949 if (err < 0) 950 goto errout; 951 modified = 1; 952 } 953 954 if (tb[IFLA_IFALIAS]) { 955 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 956 nla_len(tb[IFLA_IFALIAS])); 957 if (err < 0) 958 goto errout; 959 modified = 1; 960 } 961 962 if (tb[IFLA_BROADCAST]) { 963 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 964 send_addr_notify = 1; 965 } 966 967 if (ifm->ifi_flags || ifm->ifi_change) { 968 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 969 if (err < 0) 970 goto errout; 971 } 972 973 if (tb[IFLA_TXQLEN]) 974 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 975 976 if (tb[IFLA_OPERSTATE]) 977 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 978 979 if (tb[IFLA_LINKMODE]) { 980 write_lock_bh(&dev_base_lock); 981 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 982 write_unlock_bh(&dev_base_lock); 983 } 984 985 if (tb[IFLA_VF_MAC]) { 986 struct ifla_vf_mac *ivm; 987 ivm = nla_data(tb[IFLA_VF_MAC]); 988 err = -EOPNOTSUPP; 989 if (ops->ndo_set_vf_mac) 990 err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac); 991 if (err < 0) 992 goto errout; 993 modified = 1; 994 } 995 996 if (tb[IFLA_VF_VLAN]) { 997 struct ifla_vf_vlan *ivv; 998 ivv = nla_data(tb[IFLA_VF_VLAN]); 999 err = -EOPNOTSUPP; 1000 if (ops->ndo_set_vf_vlan) 1001 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1002 ivv->vlan, 1003 ivv->qos); 1004 if (err < 0) 1005 goto errout; 1006 modified = 1; 1007 } 1008 err = 0; 1009 1010 if (tb[IFLA_VF_TX_RATE]) { 1011 struct ifla_vf_tx_rate *ivt; 1012 ivt = nla_data(tb[IFLA_VF_TX_RATE]); 1013 err = -EOPNOTSUPP; 1014 if (ops->ndo_set_vf_tx_rate) 1015 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate); 1016 if (err < 0) 1017 goto errout; 1018 modified = 1; 1019 } 1020 err = 0; 1021 1022errout: 1023 if (err < 0 && modified && net_ratelimit()) 1024 printk(KERN_WARNING "A link change request failed with " 1025 "some changes comitted already. Interface %s may " 1026 "have been left with an inconsistent configuration, " 1027 "please check.\n", dev->name); 1028 1029 if (send_addr_notify) 1030 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1031 return err; 1032} 1033 1034static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1035{ 1036 struct net *net = sock_net(skb->sk); 1037 struct ifinfomsg *ifm; 1038 struct net_device *dev; 1039 int err; 1040 struct nlattr *tb[IFLA_MAX+1]; 1041 char ifname[IFNAMSIZ]; 1042 1043 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1044 if (err < 0) 1045 goto errout; 1046 1047 if (tb[IFLA_IFNAME]) 1048 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1049 else 1050 ifname[0] = '\0'; 1051 1052 err = -EINVAL; 1053 ifm = nlmsg_data(nlh); 1054 if (ifm->ifi_index > 0) 1055 dev = __dev_get_by_index(net, ifm->ifi_index); 1056 else if (tb[IFLA_IFNAME]) 1057 dev = __dev_get_by_name(net, ifname); 1058 else 1059 goto errout; 1060 1061 if (dev == NULL) { 1062 err = -ENODEV; 1063 goto errout; 1064 } 1065 1066 err = validate_linkmsg(dev, tb); 1067 if (err < 0) 1068 goto errout; 1069 1070 err = do_setlink(dev, ifm, tb, ifname, 0); 1071errout: 1072 return err; 1073} 1074 1075static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1076{ 1077 struct net *net = sock_net(skb->sk); 1078 const struct rtnl_link_ops *ops; 1079 struct net_device *dev; 1080 struct ifinfomsg *ifm; 1081 char ifname[IFNAMSIZ]; 1082 struct nlattr *tb[IFLA_MAX+1]; 1083 int err; 1084 1085 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1086 if (err < 0) 1087 return err; 1088 1089 if (tb[IFLA_IFNAME]) 1090 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1091 1092 ifm = nlmsg_data(nlh); 1093 if (ifm->ifi_index > 0) 1094 dev = __dev_get_by_index(net, ifm->ifi_index); 1095 else if (tb[IFLA_IFNAME]) 1096 dev = __dev_get_by_name(net, ifname); 1097 else 1098 return -EINVAL; 1099 1100 if (!dev) 1101 return -ENODEV; 1102 1103 ops = dev->rtnl_link_ops; 1104 if (!ops) 1105 return -EOPNOTSUPP; 1106 1107 ops->dellink(dev, NULL); 1108 return 0; 1109} 1110 1111int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1112{ 1113 unsigned int old_flags; 1114 int err; 1115 1116 old_flags = dev->flags; 1117 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1118 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1119 if (err < 0) 1120 return err; 1121 } 1122 1123 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1124 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1125 1126 __dev_notify_flags(dev, old_flags); 1127 return 0; 1128} 1129EXPORT_SYMBOL(rtnl_configure_link); 1130 1131struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1132 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1133{ 1134 int err; 1135 struct net_device *dev; 1136 unsigned int num_queues = 1; 1137 unsigned int real_num_queues = 1; 1138 1139 if (ops->get_tx_queues) { 1140 err = ops->get_tx_queues(src_net, tb, &num_queues, 1141 &real_num_queues); 1142 if (err) 1143 goto err; 1144 } 1145 err = -ENOMEM; 1146 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1147 if (!dev) 1148 goto err; 1149 1150 dev_net_set(dev, net); 1151 dev->rtnl_link_ops = ops; 1152 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1153 dev->real_num_tx_queues = real_num_queues; 1154 1155 if (strchr(dev->name, '%')) { 1156 err = dev_alloc_name(dev, dev->name); 1157 if (err < 0) 1158 goto err_free; 1159 } 1160 1161 if (tb[IFLA_MTU]) 1162 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1163 if (tb[IFLA_ADDRESS]) 1164 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1165 nla_len(tb[IFLA_ADDRESS])); 1166 if (tb[IFLA_BROADCAST]) 1167 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1168 nla_len(tb[IFLA_BROADCAST])); 1169 if (tb[IFLA_TXQLEN]) 1170 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1171 if (tb[IFLA_OPERSTATE]) 1172 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1173 if (tb[IFLA_LINKMODE]) 1174 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1175 1176 return dev; 1177 1178err_free: 1179 free_netdev(dev); 1180err: 1181 return ERR_PTR(err); 1182} 1183EXPORT_SYMBOL(rtnl_create_link); 1184 1185static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1186{ 1187 struct net *net = sock_net(skb->sk); 1188 const struct rtnl_link_ops *ops; 1189 struct net_device *dev; 1190 struct ifinfomsg *ifm; 1191 char kind[MODULE_NAME_LEN]; 1192 char ifname[IFNAMSIZ]; 1193 struct nlattr *tb[IFLA_MAX+1]; 1194 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1195 int err; 1196 1197#ifdef CONFIG_MODULES 1198replay: 1199#endif 1200 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1201 if (err < 0) 1202 return err; 1203 1204 if (tb[IFLA_IFNAME]) 1205 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1206 else 1207 ifname[0] = '\0'; 1208 1209 ifm = nlmsg_data(nlh); 1210 if (ifm->ifi_index > 0) 1211 dev = __dev_get_by_index(net, ifm->ifi_index); 1212 else if (ifname[0]) 1213 dev = __dev_get_by_name(net, ifname); 1214 else 1215 dev = NULL; 1216 1217 err = validate_linkmsg(dev, tb); 1218 if (err < 0) 1219 return err; 1220 1221 if (tb[IFLA_LINKINFO]) { 1222 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1223 tb[IFLA_LINKINFO], ifla_info_policy); 1224 if (err < 0) 1225 return err; 1226 } else 1227 memset(linkinfo, 0, sizeof(linkinfo)); 1228 1229 if (linkinfo[IFLA_INFO_KIND]) { 1230 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1231 ops = rtnl_link_ops_get(kind); 1232 } else { 1233 kind[0] = '\0'; 1234 ops = NULL; 1235 } 1236 1237 if (1) { 1238 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1239 struct net *dest_net; 1240 1241 if (ops) { 1242 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1243 err = nla_parse_nested(attr, ops->maxtype, 1244 linkinfo[IFLA_INFO_DATA], 1245 ops->policy); 1246 if (err < 0) 1247 return err; 1248 data = attr; 1249 } 1250 if (ops->validate) { 1251 err = ops->validate(tb, data); 1252 if (err < 0) 1253 return err; 1254 } 1255 } 1256 1257 if (dev) { 1258 int modified = 0; 1259 1260 if (nlh->nlmsg_flags & NLM_F_EXCL) 1261 return -EEXIST; 1262 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1263 return -EOPNOTSUPP; 1264 1265 if (linkinfo[IFLA_INFO_DATA]) { 1266 if (!ops || ops != dev->rtnl_link_ops || 1267 !ops->changelink) 1268 return -EOPNOTSUPP; 1269 1270 err = ops->changelink(dev, tb, data); 1271 if (err < 0) 1272 return err; 1273 modified = 1; 1274 } 1275 1276 return do_setlink(dev, ifm, tb, ifname, modified); 1277 } 1278 1279 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1280 return -ENODEV; 1281 1282 if (ifm->ifi_index) 1283 return -EOPNOTSUPP; 1284 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1285 return -EOPNOTSUPP; 1286 1287 if (!ops) { 1288#ifdef CONFIG_MODULES 1289 if (kind[0]) { 1290 __rtnl_unlock(); 1291 request_module("rtnl-link-%s", kind); 1292 rtnl_lock(); 1293 ops = rtnl_link_ops_get(kind); 1294 if (ops) 1295 goto replay; 1296 } 1297#endif 1298 return -EOPNOTSUPP; 1299 } 1300 1301 if (!ifname[0]) 1302 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1303 1304 dest_net = rtnl_link_get_net(net, tb); 1305 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1306 1307 if (IS_ERR(dev)) 1308 err = PTR_ERR(dev); 1309 else if (ops->newlink) 1310 err = ops->newlink(net, dev, tb, data); 1311 else 1312 err = register_netdevice(dev); 1313 if (err < 0 && !IS_ERR(dev)) { 1314 free_netdev(dev); 1315 goto out; 1316 } 1317 1318 err = rtnl_configure_link(dev, ifm); 1319 if (err < 0) 1320 unregister_netdevice(dev); 1321out: 1322 put_net(dest_net); 1323 return err; 1324 } 1325} 1326 1327static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1328{ 1329 struct net *net = sock_net(skb->sk); 1330 struct ifinfomsg *ifm; 1331 char ifname[IFNAMSIZ]; 1332 struct nlattr *tb[IFLA_MAX+1]; 1333 struct net_device *dev = NULL; 1334 struct sk_buff *nskb; 1335 int err; 1336 1337 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1338 if (err < 0) 1339 return err; 1340 1341 if (tb[IFLA_IFNAME]) 1342 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1343 1344 ifm = nlmsg_data(nlh); 1345 if (ifm->ifi_index > 0) 1346 dev = __dev_get_by_index(net, ifm->ifi_index); 1347 else if (tb[IFLA_IFNAME]) 1348 dev = __dev_get_by_name(net, ifname); 1349 else 1350 return -EINVAL; 1351 1352 if (dev == NULL) 1353 return -ENODEV; 1354 1355 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1356 if (nskb == NULL) 1357 return -ENOBUFS; 1358 1359 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1360 nlh->nlmsg_seq, 0, 0); 1361 if (err < 0) { 1362 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1363 WARN_ON(err == -EMSGSIZE); 1364 kfree_skb(nskb); 1365 } else 1366 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1367 1368 return err; 1369} 1370 1371static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1372{ 1373 int idx; 1374 int s_idx = cb->family; 1375 1376 if (s_idx == 0) 1377 s_idx = 1; 1378 for (idx = 1; idx < NPROTO; idx++) { 1379 int type = cb->nlh->nlmsg_type-RTM_BASE; 1380 if (idx < s_idx || idx == PF_PACKET) 1381 continue; 1382 if (rtnl_msg_handlers[idx] == NULL || 1383 rtnl_msg_handlers[idx][type].dumpit == NULL) 1384 continue; 1385 if (idx > s_idx) 1386 memset(&cb->args[0], 0, sizeof(cb->args)); 1387 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1388 break; 1389 } 1390 cb->family = idx; 1391 1392 return skb->len; 1393} 1394 1395void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1396{ 1397 struct net *net = dev_net(dev); 1398 struct sk_buff *skb; 1399 int err = -ENOBUFS; 1400 1401 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1402 if (skb == NULL) 1403 goto errout; 1404 1405 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1406 if (err < 0) { 1407 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1408 WARN_ON(err == -EMSGSIZE); 1409 kfree_skb(skb); 1410 goto errout; 1411 } 1412 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1413 return; 1414errout: 1415 if (err < 0) 1416 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1417} 1418 1419/* Protected by RTNL sempahore. */ 1420static struct rtattr **rta_buf; 1421static int rtattr_max; 1422 1423/* Process one rtnetlink message. */ 1424 1425static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1426{ 1427 struct net *net = sock_net(skb->sk); 1428 rtnl_doit_func doit; 1429 int sz_idx, kind; 1430 int min_len; 1431 int family; 1432 int type; 1433 int err; 1434 1435 type = nlh->nlmsg_type; 1436 if (type > RTM_MAX) 1437 return -EOPNOTSUPP; 1438 1439 type -= RTM_BASE; 1440 1441 /* All the messages must have at least 1 byte length */ 1442 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1443 return 0; 1444 1445 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1446 if (family >= NPROTO) 1447 return -EAFNOSUPPORT; 1448 1449 sz_idx = type>>2; 1450 kind = type&3; 1451 1452 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1453 return -EPERM; 1454 1455 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1456 struct sock *rtnl; 1457 rtnl_dumpit_func dumpit; 1458 1459 dumpit = rtnl_get_dumpit(family, type); 1460 if (dumpit == NULL) 1461 return -EOPNOTSUPP; 1462 1463 __rtnl_unlock(); 1464 rtnl = net->rtnl; 1465 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1466 rtnl_lock(); 1467 return err; 1468 } 1469 1470 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1471 1472 min_len = rtm_min[sz_idx]; 1473 if (nlh->nlmsg_len < min_len) 1474 return -EINVAL; 1475 1476 if (nlh->nlmsg_len > min_len) { 1477 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1478 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1479 1480 while (RTA_OK(attr, attrlen)) { 1481 unsigned flavor = attr->rta_type; 1482 if (flavor) { 1483 if (flavor > rta_max[sz_idx]) 1484 return -EINVAL; 1485 rta_buf[flavor-1] = attr; 1486 } 1487 attr = RTA_NEXT(attr, attrlen); 1488 } 1489 } 1490 1491 doit = rtnl_get_doit(family, type); 1492 if (doit == NULL) 1493 return -EOPNOTSUPP; 1494 1495 return doit(skb, nlh, (void *)&rta_buf[0]); 1496} 1497 1498static void rtnetlink_rcv(struct sk_buff *skb) 1499{ 1500 rtnl_lock(); 1501 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1502 rtnl_unlock(); 1503} 1504 1505static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1506{ 1507 struct net_device *dev = ptr; 1508 1509 switch (event) { 1510 case NETDEV_UP: 1511 case NETDEV_DOWN: 1512 case NETDEV_PRE_UP: 1513 case NETDEV_POST_INIT: 1514 case NETDEV_REGISTER: 1515 case NETDEV_CHANGE: 1516 case NETDEV_GOING_DOWN: 1517 case NETDEV_UNREGISTER: 1518 case NETDEV_UNREGISTER_BATCH: 1519 break; 1520 default: 1521 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1522 break; 1523 } 1524 return NOTIFY_DONE; 1525} 1526 1527static struct notifier_block rtnetlink_dev_notifier = { 1528 .notifier_call = rtnetlink_event, 1529}; 1530 1531 1532static int __net_init rtnetlink_net_init(struct net *net) 1533{ 1534 struct sock *sk; 1535 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1536 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1537 if (!sk) 1538 return -ENOMEM; 1539 net->rtnl = sk; 1540 return 0; 1541} 1542 1543static void __net_exit rtnetlink_net_exit(struct net *net) 1544{ 1545 netlink_kernel_release(net->rtnl); 1546 net->rtnl = NULL; 1547} 1548 1549static struct pernet_operations rtnetlink_net_ops = { 1550 .init = rtnetlink_net_init, 1551 .exit = rtnetlink_net_exit, 1552}; 1553 1554void __init rtnetlink_init(void) 1555{ 1556 int i; 1557 1558 rtattr_max = 0; 1559 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1560 if (rta_max[i] > rtattr_max) 1561 rtattr_max = rta_max[i]; 1562 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1563 if (!rta_buf) 1564 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1565 1566 if (register_pernet_subsys(&rtnetlink_net_ops)) 1567 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1568 1569 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1570 register_netdevice_notifier(&rtnetlink_dev_notifier); 1571 1572 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1573 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1574 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1575 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1576 1577 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1578 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1579} 1580 1581