1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/timer.h> 25 #include <linux/string.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/slab.h> 31 #include <linux/interrupt.h> 32 #include <linux/capability.h> 33 #include <linux/skbuff.h> 34 #include <linux/init.h> 35 #include <linux/security.h> 36 #include <linux/mutex.h> 37 #include <linux/if_addr.h> 38 #include <linux/pci.h> 39 40 #include <asm/uaccess.h> 41 #include <asm/system.h> 42 43 #include <linux/inet.h> 44 #include <linux/netdevice.h> 45 #include <net/ip.h> 46 #include <net/protocol.h> 47 #include <net/arp.h> 48 #include <net/route.h> 49 #include <net/udp.h> 50 #include <net/sock.h> 51 #include <net/pkt_sched.h> 52 #include <net/fib_rules.h> 53 #include <net/rtnetlink.h> 54 #include <net/net_namespace.h> 55 56 struct rtnl_link { 57 rtnl_doit_func doit; 58 rtnl_dumpit_func dumpit; 59 }; 60 61 static DEFINE_MUTEX(rtnl_mutex); 62 63 void rtnl_lock(void) 64 { 65 mutex_lock(&rtnl_mutex); 66 } 67 EXPORT_SYMBOL(rtnl_lock); 68 69 void __rtnl_unlock(void) 70 { 71 mutex_unlock(&rtnl_mutex); 72 } 73 74 void rtnl_unlock(void) 75 { 76 /* This fellow will unlock it for us. */ 77 netdev_run_todo(); 78 } 79 EXPORT_SYMBOL(rtnl_unlock); 80 81 int rtnl_trylock(void) 82 { 83 return mutex_trylock(&rtnl_mutex); 84 } 85 EXPORT_SYMBOL(rtnl_trylock); 86 87 int rtnl_is_locked(void) 88 { 89 return mutex_is_locked(&rtnl_mutex); 90 } 91 EXPORT_SYMBOL(rtnl_is_locked); 92 93 #ifdef CONFIG_PROVE_LOCKING 94 int lockdep_rtnl_is_held(void) 95 { 96 return lockdep_is_held(&rtnl_mutex); 97 } 98 EXPORT_SYMBOL(lockdep_rtnl_is_held); 99 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 100 101 static struct rtnl_link *rtnl_msg_handlers[NPROTO]; 102 103 static 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 } 116 117 static 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 } 127 128 static 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 */ 156 int __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 } 182 EXPORT_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 */ 193 void 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 } 201 EXPORT_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 */ 210 int 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 } 225 EXPORT_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 */ 234 void 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 } 241 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 242 243 static 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 */ 255 int __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 } 263 EXPORT_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 */ 271 int 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 } 280 EXPORT_SYMBOL_GPL(rtnl_link_register); 281 282 static 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 } 293 294 void 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 } 300 EXPORT_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 */ 308 void __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 } 317 EXPORT_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 */ 323 void rtnl_link_unregister(struct rtnl_link_ops *ops) 324 { 325 rtnl_lock(); 326 __rtnl_link_unregister(ops); 327 rtnl_unlock(); 328 } 329 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 330 331 static 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 } 341 342 static 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 } 363 364 static 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; 393 394 err_cancel_data: 395 nla_nest_cancel(skb, data); 396 err_cancel_link: 397 nla_nest_cancel(skb, linkinfo); 398 out: 399 return err; 400 } 401 402 static 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 }; 415 416 static 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 }; 427 428 void __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 } 439 EXPORT_SYMBOL(__rta_fill); 440 441 int 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 } 454 455 int 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 } 461 EXPORT_SYMBOL(rtnl_unicast); 462 463 void 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 } 474 EXPORT_SYMBOL(rtnl_notify); 475 476 void 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 } 482 EXPORT_SYMBOL(rtnl_set_sk_err); 483 484 int 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); 506 507 nla_put_failure: 508 nla_nest_cancel(skb, mx); 509 return -EMSGSIZE; 510 } 511 EXPORT_SYMBOL(rtnetlink_put_metrics); 512 513 int 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 } 531 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 532 533 static 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 } 559 560 static 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 } 572 573 static 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 }; 604 605 static inline int rtnl_vfinfo_size(const struct net_device *dev) 606 { 607 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) 608 return dev_num_vf(dev->dev.parent) * 609 sizeof(struct ifla_vf_info); 610 else 611 return 0; 612 } 613 614 static inline size_t if_nlmsg_size(const struct net_device *dev) 615 { 616 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 617 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 618 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 619 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 620 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 621 + nla_total_size(sizeof(struct rtnl_link_stats)) 622 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 623 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 624 + nla_total_size(4) /* IFLA_TXQLEN */ 625 + nla_total_size(4) /* IFLA_WEIGHT */ 626 + nla_total_size(4) /* IFLA_MTU */ 627 + nla_total_size(4) /* IFLA_LINK */ 628 + nla_total_size(4) /* IFLA_MASTER */ 629 + nla_total_size(1) /* IFLA_OPERSTATE */ 630 + nla_total_size(1) /* IFLA_LINKMODE */ 631 + nla_total_size(4) /* IFLA_NUM_VF */ 632 + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */ 633 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 634 } 635 636 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 637 int type, u32 pid, u32 seq, u32 change, 638 unsigned int flags) 639 { 640 struct ifinfomsg *ifm; 641 struct nlmsghdr *nlh; 642 const struct net_device_stats *stats; 643 struct nlattr *attr; 644 645 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 646 if (nlh == NULL) 647 return -EMSGSIZE; 648 649 ifm = nlmsg_data(nlh); 650 ifm->ifi_family = AF_UNSPEC; 651 ifm->__ifi_pad = 0; 652 ifm->ifi_type = dev->type; 653 ifm->ifi_index = dev->ifindex; 654 ifm->ifi_flags = dev_get_flags(dev); 655 ifm->ifi_change = change; 656 657 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 658 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 659 NLA_PUT_U8(skb, IFLA_OPERSTATE, 660 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 661 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 662 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 663 664 if (dev->ifindex != dev->iflink) 665 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 666 667 if (dev->master) 668 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 669 670 if (dev->qdisc) 671 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 672 673 if (dev->ifalias) 674 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 675 676 if (1) { 677 struct rtnl_link_ifmap map = { 678 .mem_start = dev->mem_start, 679 .mem_end = dev->mem_end, 680 .base_addr = dev->base_addr, 681 .irq = dev->irq, 682 .dma = dev->dma, 683 .port = dev->if_port, 684 }; 685 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 686 } 687 688 if (dev->addr_len) { 689 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 690 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 691 } 692 693 attr = nla_reserve(skb, IFLA_STATS, 694 sizeof(struct rtnl_link_stats)); 695 if (attr == NULL) 696 goto nla_put_failure; 697 698 stats = dev_get_stats(dev); 699 copy_rtnl_link_stats(nla_data(attr), stats); 700 701 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) { 702 int i; 703 struct ifla_vf_info ivi; 704 705 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); 706 for (i = 0; i < dev_num_vf(dev->dev.parent); i++) { 707 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 708 break; 709 NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi); 710 } 711 } 712 if (dev->rtnl_link_ops) { 713 if (rtnl_link_fill(skb, dev) < 0) 714 goto nla_put_failure; 715 } 716 717 return nlmsg_end(skb, nlh); 718 719 nla_put_failure: 720 nlmsg_cancel(skb, nlh); 721 return -EMSGSIZE; 722 } 723 724 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 725 { 726 struct net *net = sock_net(skb->sk); 727 int h, s_h; 728 int idx = 0, s_idx; 729 struct net_device *dev; 730 struct hlist_head *head; 731 struct hlist_node *node; 732 733 s_h = cb->args[0]; 734 s_idx = cb->args[1]; 735 736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 737 idx = 0; 738 head = &net->dev_index_head[h]; 739 hlist_for_each_entry(dev, node, head, index_hlist) { 740 if (idx < s_idx) 741 goto cont; 742 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 743 NETLINK_CB(cb->skb).pid, 744 cb->nlh->nlmsg_seq, 0, 745 NLM_F_MULTI) <= 0) 746 goto out; 747 cont: 748 idx++; 749 } 750 } 751 out: 752 cb->args[1] = idx; 753 cb->args[0] = h; 754 755 return skb->len; 756 } 757 758 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 759 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 760 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 761 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 762 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 763 [IFLA_MTU] = { .type = NLA_U32 }, 764 [IFLA_LINK] = { .type = NLA_U32 }, 765 [IFLA_TXQLEN] = { .type = NLA_U32 }, 766 [IFLA_WEIGHT] = { .type = NLA_U32 }, 767 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 768 [IFLA_LINKMODE] = { .type = NLA_U8 }, 769 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 770 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 771 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 772 [IFLA_VF_MAC] = { .type = NLA_BINARY, 773 .len = sizeof(struct ifla_vf_mac) }, 774 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 775 .len = sizeof(struct ifla_vf_vlan) }, 776 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 777 .len = sizeof(struct ifla_vf_tx_rate) }, 778 }; 779 EXPORT_SYMBOL(ifla_policy); 780 781 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 782 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 783 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 784 }; 785 786 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 787 { 788 struct net *net; 789 /* Examine the link attributes and figure out which 790 * network namespace we are talking about. 791 */ 792 if (tb[IFLA_NET_NS_PID]) 793 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 794 else 795 net = get_net(src_net); 796 return net; 797 } 798 EXPORT_SYMBOL(rtnl_link_get_net); 799 800 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 801 { 802 if (dev) { 803 if (tb[IFLA_ADDRESS] && 804 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 805 return -EINVAL; 806 807 if (tb[IFLA_BROADCAST] && 808 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 809 return -EINVAL; 810 } 811 812 return 0; 813 } 814 815 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 816 struct nlattr **tb, char *ifname, int modified) 817 { 818 const struct net_device_ops *ops = dev->netdev_ops; 819 int send_addr_notify = 0; 820 int err; 821 822 if (tb[IFLA_NET_NS_PID]) { 823 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 824 if (IS_ERR(net)) { 825 err = PTR_ERR(net); 826 goto errout; 827 } 828 err = dev_change_net_namespace(dev, net, ifname); 829 put_net(net); 830 if (err) 831 goto errout; 832 modified = 1; 833 } 834 835 if (tb[IFLA_MAP]) { 836 struct rtnl_link_ifmap *u_map; 837 struct ifmap k_map; 838 839 if (!ops->ndo_set_config) { 840 err = -EOPNOTSUPP; 841 goto errout; 842 } 843 844 if (!netif_device_present(dev)) { 845 err = -ENODEV; 846 goto errout; 847 } 848 849 u_map = nla_data(tb[IFLA_MAP]); 850 k_map.mem_start = (unsigned long) u_map->mem_start; 851 k_map.mem_end = (unsigned long) u_map->mem_end; 852 k_map.base_addr = (unsigned short) u_map->base_addr; 853 k_map.irq = (unsigned char) u_map->irq; 854 k_map.dma = (unsigned char) u_map->dma; 855 k_map.port = (unsigned char) u_map->port; 856 857 err = ops->ndo_set_config(dev, &k_map); 858 if (err < 0) 859 goto errout; 860 861 modified = 1; 862 } 863 864 if (tb[IFLA_ADDRESS]) { 865 struct sockaddr *sa; 866 int len; 867 868 if (!ops->ndo_set_mac_address) { 869 err = -EOPNOTSUPP; 870 goto errout; 871 } 872 873 if (!netif_device_present(dev)) { 874 err = -ENODEV; 875 goto errout; 876 } 877 878 len = sizeof(sa_family_t) + dev->addr_len; 879 sa = kmalloc(len, GFP_KERNEL); 880 if (!sa) { 881 err = -ENOMEM; 882 goto errout; 883 } 884 sa->sa_family = dev->type; 885 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 886 dev->addr_len); 887 err = ops->ndo_set_mac_address(dev, sa); 888 kfree(sa); 889 if (err) 890 goto errout; 891 send_addr_notify = 1; 892 modified = 1; 893 } 894 895 if (tb[IFLA_MTU]) { 896 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 897 if (err < 0) 898 goto errout; 899 modified = 1; 900 } 901 902 /* 903 * Interface selected by interface index but interface 904 * name provided implies that a name change has been 905 * requested. 906 */ 907 if (ifm->ifi_index > 0 && ifname[0]) { 908 err = dev_change_name(dev, ifname); 909 if (err < 0) 910 goto errout; 911 modified = 1; 912 } 913 914 if (tb[IFLA_IFALIAS]) { 915 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 916 nla_len(tb[IFLA_IFALIAS])); 917 if (err < 0) 918 goto errout; 919 modified = 1; 920 } 921 922 if (tb[IFLA_BROADCAST]) { 923 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 924 send_addr_notify = 1; 925 } 926 927 if (ifm->ifi_flags || ifm->ifi_change) { 928 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 929 if (err < 0) 930 goto errout; 931 } 932 933 if (tb[IFLA_TXQLEN]) 934 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 935 936 if (tb[IFLA_OPERSTATE]) 937 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 938 939 if (tb[IFLA_LINKMODE]) { 940 write_lock_bh(&dev_base_lock); 941 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 942 write_unlock_bh(&dev_base_lock); 943 } 944 945 if (tb[IFLA_VF_MAC]) { 946 struct ifla_vf_mac *ivm; 947 ivm = nla_data(tb[IFLA_VF_MAC]); 948 err = -EOPNOTSUPP; 949 if (ops->ndo_set_vf_mac) 950 err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac); 951 if (err < 0) 952 goto errout; 953 modified = 1; 954 } 955 956 if (tb[IFLA_VF_VLAN]) { 957 struct ifla_vf_vlan *ivv; 958 ivv = nla_data(tb[IFLA_VF_VLAN]); 959 err = -EOPNOTSUPP; 960 if (ops->ndo_set_vf_vlan) 961 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 962 ivv->vlan, 963 ivv->qos); 964 if (err < 0) 965 goto errout; 966 modified = 1; 967 } 968 err = 0; 969 970 if (tb[IFLA_VF_TX_RATE]) { 971 struct ifla_vf_tx_rate *ivt; 972 ivt = nla_data(tb[IFLA_VF_TX_RATE]); 973 err = -EOPNOTSUPP; 974 if (ops->ndo_set_vf_tx_rate) 975 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate); 976 if (err < 0) 977 goto errout; 978 modified = 1; 979 } 980 err = 0; 981 982 errout: 983 if (err < 0 && modified && net_ratelimit()) 984 printk(KERN_WARNING "A link change request failed with " 985 "some changes comitted already. Interface %s may " 986 "have been left with an inconsistent configuration, " 987 "please check.\n", dev->name); 988 989 if (send_addr_notify) 990 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 991 return err; 992 } 993 994 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 995 { 996 struct net *net = sock_net(skb->sk); 997 struct ifinfomsg *ifm; 998 struct net_device *dev; 999 int err; 1000 struct nlattr *tb[IFLA_MAX+1]; 1001 char ifname[IFNAMSIZ]; 1002 1003 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1004 if (err < 0) 1005 goto errout; 1006 1007 if (tb[IFLA_IFNAME]) 1008 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1009 else 1010 ifname[0] = '\0'; 1011 1012 err = -EINVAL; 1013 ifm = nlmsg_data(nlh); 1014 if (ifm->ifi_index > 0) 1015 dev = __dev_get_by_index(net, ifm->ifi_index); 1016 else if (tb[IFLA_IFNAME]) 1017 dev = __dev_get_by_name(net, ifname); 1018 else 1019 goto errout; 1020 1021 if (dev == NULL) { 1022 err = -ENODEV; 1023 goto errout; 1024 } 1025 1026 err = validate_linkmsg(dev, tb); 1027 if (err < 0) 1028 goto errout; 1029 1030 err = do_setlink(dev, ifm, tb, ifname, 0); 1031 errout: 1032 return err; 1033 } 1034 1035 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1036 { 1037 struct net *net = sock_net(skb->sk); 1038 const struct rtnl_link_ops *ops; 1039 struct net_device *dev; 1040 struct ifinfomsg *ifm; 1041 char ifname[IFNAMSIZ]; 1042 struct nlattr *tb[IFLA_MAX+1]; 1043 int err; 1044 1045 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1046 if (err < 0) 1047 return err; 1048 1049 if (tb[IFLA_IFNAME]) 1050 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1051 1052 ifm = nlmsg_data(nlh); 1053 if (ifm->ifi_index > 0) 1054 dev = __dev_get_by_index(net, ifm->ifi_index); 1055 else if (tb[IFLA_IFNAME]) 1056 dev = __dev_get_by_name(net, ifname); 1057 else 1058 return -EINVAL; 1059 1060 if (!dev) 1061 return -ENODEV; 1062 1063 ops = dev->rtnl_link_ops; 1064 if (!ops) 1065 return -EOPNOTSUPP; 1066 1067 ops->dellink(dev, NULL); 1068 return 0; 1069 } 1070 1071 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1072 { 1073 unsigned int old_flags; 1074 int err; 1075 1076 old_flags = dev->flags; 1077 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1078 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1079 if (err < 0) 1080 return err; 1081 } 1082 1083 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1084 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1085 1086 __dev_notify_flags(dev, old_flags); 1087 return 0; 1088 } 1089 EXPORT_SYMBOL(rtnl_configure_link); 1090 1091 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1092 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1093 { 1094 int err; 1095 struct net_device *dev; 1096 unsigned int num_queues = 1; 1097 unsigned int real_num_queues = 1; 1098 1099 if (ops->get_tx_queues) { 1100 err = ops->get_tx_queues(src_net, tb, &num_queues, 1101 &real_num_queues); 1102 if (err) 1103 goto err; 1104 } 1105 err = -ENOMEM; 1106 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1107 if (!dev) 1108 goto err; 1109 1110 dev_net_set(dev, net); 1111 dev->rtnl_link_ops = ops; 1112 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1113 dev->real_num_tx_queues = real_num_queues; 1114 1115 if (strchr(dev->name, '%')) { 1116 err = dev_alloc_name(dev, dev->name); 1117 if (err < 0) 1118 goto err_free; 1119 } 1120 1121 if (tb[IFLA_MTU]) 1122 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1123 if (tb[IFLA_ADDRESS]) 1124 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1125 nla_len(tb[IFLA_ADDRESS])); 1126 if (tb[IFLA_BROADCAST]) 1127 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1128 nla_len(tb[IFLA_BROADCAST])); 1129 if (tb[IFLA_TXQLEN]) 1130 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1131 if (tb[IFLA_OPERSTATE]) 1132 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1133 if (tb[IFLA_LINKMODE]) 1134 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1135 1136 return dev; 1137 1138 err_free: 1139 free_netdev(dev); 1140 err: 1141 return ERR_PTR(err); 1142 } 1143 EXPORT_SYMBOL(rtnl_create_link); 1144 1145 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1146 { 1147 struct net *net = sock_net(skb->sk); 1148 const struct rtnl_link_ops *ops; 1149 struct net_device *dev; 1150 struct ifinfomsg *ifm; 1151 char kind[MODULE_NAME_LEN]; 1152 char ifname[IFNAMSIZ]; 1153 struct nlattr *tb[IFLA_MAX+1]; 1154 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1155 int err; 1156 1157 #ifdef CONFIG_MODULES 1158 replay: 1159 #endif 1160 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1161 if (err < 0) 1162 return err; 1163 1164 if (tb[IFLA_IFNAME]) 1165 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1166 else 1167 ifname[0] = '\0'; 1168 1169 ifm = nlmsg_data(nlh); 1170 if (ifm->ifi_index > 0) 1171 dev = __dev_get_by_index(net, ifm->ifi_index); 1172 else if (ifname[0]) 1173 dev = __dev_get_by_name(net, ifname); 1174 else 1175 dev = NULL; 1176 1177 err = validate_linkmsg(dev, tb); 1178 if (err < 0) 1179 return err; 1180 1181 if (tb[IFLA_LINKINFO]) { 1182 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1183 tb[IFLA_LINKINFO], ifla_info_policy); 1184 if (err < 0) 1185 return err; 1186 } else 1187 memset(linkinfo, 0, sizeof(linkinfo)); 1188 1189 if (linkinfo[IFLA_INFO_KIND]) { 1190 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1191 ops = rtnl_link_ops_get(kind); 1192 } else { 1193 kind[0] = '\0'; 1194 ops = NULL; 1195 } 1196 1197 if (1) { 1198 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1199 struct net *dest_net; 1200 1201 if (ops) { 1202 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1203 err = nla_parse_nested(attr, ops->maxtype, 1204 linkinfo[IFLA_INFO_DATA], 1205 ops->policy); 1206 if (err < 0) 1207 return err; 1208 data = attr; 1209 } 1210 if (ops->validate) { 1211 err = ops->validate(tb, data); 1212 if (err < 0) 1213 return err; 1214 } 1215 } 1216 1217 if (dev) { 1218 int modified = 0; 1219 1220 if (nlh->nlmsg_flags & NLM_F_EXCL) 1221 return -EEXIST; 1222 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1223 return -EOPNOTSUPP; 1224 1225 if (linkinfo[IFLA_INFO_DATA]) { 1226 if (!ops || ops != dev->rtnl_link_ops || 1227 !ops->changelink) 1228 return -EOPNOTSUPP; 1229 1230 err = ops->changelink(dev, tb, data); 1231 if (err < 0) 1232 return err; 1233 modified = 1; 1234 } 1235 1236 return do_setlink(dev, ifm, tb, ifname, modified); 1237 } 1238 1239 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1240 return -ENODEV; 1241 1242 if (ifm->ifi_index) 1243 return -EOPNOTSUPP; 1244 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1245 return -EOPNOTSUPP; 1246 1247 if (!ops) { 1248 #ifdef CONFIG_MODULES 1249 if (kind[0]) { 1250 __rtnl_unlock(); 1251 request_module("rtnl-link-%s", kind); 1252 rtnl_lock(); 1253 ops = rtnl_link_ops_get(kind); 1254 if (ops) 1255 goto replay; 1256 } 1257 #endif 1258 return -EOPNOTSUPP; 1259 } 1260 1261 if (!ifname[0]) 1262 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1263 1264 dest_net = rtnl_link_get_net(net, tb); 1265 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1266 1267 if (IS_ERR(dev)) 1268 err = PTR_ERR(dev); 1269 else if (ops->newlink) 1270 err = ops->newlink(net, dev, tb, data); 1271 else 1272 err = register_netdevice(dev); 1273 if (err < 0 && !IS_ERR(dev)) { 1274 free_netdev(dev); 1275 goto out; 1276 } 1277 1278 err = rtnl_configure_link(dev, ifm); 1279 if (err < 0) 1280 unregister_netdevice(dev); 1281 out: 1282 put_net(dest_net); 1283 return err; 1284 } 1285 } 1286 1287 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1288 { 1289 struct net *net = sock_net(skb->sk); 1290 struct ifinfomsg *ifm; 1291 char ifname[IFNAMSIZ]; 1292 struct nlattr *tb[IFLA_MAX+1]; 1293 struct net_device *dev = NULL; 1294 struct sk_buff *nskb; 1295 int err; 1296 1297 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1298 if (err < 0) 1299 return err; 1300 1301 if (tb[IFLA_IFNAME]) 1302 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1303 1304 ifm = nlmsg_data(nlh); 1305 if (ifm->ifi_index > 0) 1306 dev = __dev_get_by_index(net, ifm->ifi_index); 1307 else if (tb[IFLA_IFNAME]) 1308 dev = __dev_get_by_name(net, ifname); 1309 else 1310 return -EINVAL; 1311 1312 if (dev == NULL) 1313 return -ENODEV; 1314 1315 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1316 if (nskb == NULL) 1317 return -ENOBUFS; 1318 1319 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1320 nlh->nlmsg_seq, 0, 0); 1321 if (err < 0) { 1322 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1323 WARN_ON(err == -EMSGSIZE); 1324 kfree_skb(nskb); 1325 } else 1326 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1327 1328 return err; 1329 } 1330 1331 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1332 { 1333 int idx; 1334 int s_idx = cb->family; 1335 1336 if (s_idx == 0) 1337 s_idx = 1; 1338 for (idx = 1; idx < NPROTO; idx++) { 1339 int type = cb->nlh->nlmsg_type-RTM_BASE; 1340 if (idx < s_idx || idx == PF_PACKET) 1341 continue; 1342 if (rtnl_msg_handlers[idx] == NULL || 1343 rtnl_msg_handlers[idx][type].dumpit == NULL) 1344 continue; 1345 if (idx > s_idx) 1346 memset(&cb->args[0], 0, sizeof(cb->args)); 1347 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1348 break; 1349 } 1350 cb->family = idx; 1351 1352 return skb->len; 1353 } 1354 1355 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1356 { 1357 struct net *net = dev_net(dev); 1358 struct sk_buff *skb; 1359 int err = -ENOBUFS; 1360 1361 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1362 if (skb == NULL) 1363 goto errout; 1364 1365 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1366 if (err < 0) { 1367 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1368 WARN_ON(err == -EMSGSIZE); 1369 kfree_skb(skb); 1370 goto errout; 1371 } 1372 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1373 return; 1374 errout: 1375 if (err < 0) 1376 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1377 } 1378 1379 /* Protected by RTNL sempahore. */ 1380 static struct rtattr **rta_buf; 1381 static int rtattr_max; 1382 1383 /* Process one rtnetlink message. */ 1384 1385 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1386 { 1387 struct net *net = sock_net(skb->sk); 1388 rtnl_doit_func doit; 1389 int sz_idx, kind; 1390 int min_len; 1391 int family; 1392 int type; 1393 int err; 1394 1395 type = nlh->nlmsg_type; 1396 if (type > RTM_MAX) 1397 return -EOPNOTSUPP; 1398 1399 type -= RTM_BASE; 1400 1401 /* All the messages must have at least 1 byte length */ 1402 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1403 return 0; 1404 1405 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1406 if (family >= NPROTO) 1407 return -EAFNOSUPPORT; 1408 1409 sz_idx = type>>2; 1410 kind = type&3; 1411 1412 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1413 return -EPERM; 1414 1415 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1416 struct sock *rtnl; 1417 rtnl_dumpit_func dumpit; 1418 1419 dumpit = rtnl_get_dumpit(family, type); 1420 if (dumpit == NULL) 1421 return -EOPNOTSUPP; 1422 1423 __rtnl_unlock(); 1424 rtnl = net->rtnl; 1425 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1426 rtnl_lock(); 1427 return err; 1428 } 1429 1430 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1431 1432 min_len = rtm_min[sz_idx]; 1433 if (nlh->nlmsg_len < min_len) 1434 return -EINVAL; 1435 1436 if (nlh->nlmsg_len > min_len) { 1437 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1438 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1439 1440 while (RTA_OK(attr, attrlen)) { 1441 unsigned flavor = attr->rta_type; 1442 if (flavor) { 1443 if (flavor > rta_max[sz_idx]) 1444 return -EINVAL; 1445 rta_buf[flavor-1] = attr; 1446 } 1447 attr = RTA_NEXT(attr, attrlen); 1448 } 1449 } 1450 1451 doit = rtnl_get_doit(family, type); 1452 if (doit == NULL) 1453 return -EOPNOTSUPP; 1454 1455 return doit(skb, nlh, (void *)&rta_buf[0]); 1456 } 1457 1458 static void rtnetlink_rcv(struct sk_buff *skb) 1459 { 1460 rtnl_lock(); 1461 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1462 rtnl_unlock(); 1463 } 1464 1465 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1466 { 1467 struct net_device *dev = ptr; 1468 1469 switch (event) { 1470 case NETDEV_UP: 1471 case NETDEV_DOWN: 1472 case NETDEV_PRE_UP: 1473 case NETDEV_POST_INIT: 1474 case NETDEV_REGISTER: 1475 case NETDEV_CHANGE: 1476 case NETDEV_GOING_DOWN: 1477 case NETDEV_UNREGISTER: 1478 case NETDEV_UNREGISTER_BATCH: 1479 break; 1480 default: 1481 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1482 break; 1483 } 1484 return NOTIFY_DONE; 1485 } 1486 1487 static struct notifier_block rtnetlink_dev_notifier = { 1488 .notifier_call = rtnetlink_event, 1489 }; 1490 1491 1492 static int __net_init rtnetlink_net_init(struct net *net) 1493 { 1494 struct sock *sk; 1495 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1496 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1497 if (!sk) 1498 return -ENOMEM; 1499 net->rtnl = sk; 1500 return 0; 1501 } 1502 1503 static void __net_exit rtnetlink_net_exit(struct net *net) 1504 { 1505 netlink_kernel_release(net->rtnl); 1506 net->rtnl = NULL; 1507 } 1508 1509 static struct pernet_operations rtnetlink_net_ops = { 1510 .init = rtnetlink_net_init, 1511 .exit = rtnetlink_net_exit, 1512 }; 1513 1514 void __init rtnetlink_init(void) 1515 { 1516 int i; 1517 1518 rtattr_max = 0; 1519 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1520 if (rta_max[i] > rtattr_max) 1521 rtattr_max = rta_max[i]; 1522 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1523 if (!rta_buf) 1524 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1525 1526 if (register_pernet_subsys(&rtnetlink_net_ops)) 1527 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1528 1529 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1530 register_netdevice_notifier(&rtnetlink_dev_notifier); 1531 1532 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1533 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1534 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1535 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1536 1537 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1538 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1539 } 1540 1541