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 39 #include <asm/uaccess.h> 40 #include <asm/system.h> 41 42 #include <linux/inet.h> 43 #include <linux/netdevice.h> 44 #include <net/ip.h> 45 #include <net/protocol.h> 46 #include <net/arp.h> 47 #include <net/route.h> 48 #include <net/udp.h> 49 #include <net/sock.h> 50 #include <net/pkt_sched.h> 51 #include <net/fib_rules.h> 52 #include <net/rtnetlink.h> 53 #include <net/net_namespace.h> 54 55 struct rtnl_link { 56 rtnl_doit_func doit; 57 rtnl_dumpit_func dumpit; 58 }; 59 60 static DEFINE_MUTEX(rtnl_mutex); 61 62 void rtnl_lock(void) 63 { 64 mutex_lock(&rtnl_mutex); 65 } 66 EXPORT_SYMBOL(rtnl_lock); 67 68 void __rtnl_unlock(void) 69 { 70 mutex_unlock(&rtnl_mutex); 71 } 72 73 void rtnl_unlock(void) 74 { 75 /* This fellow will unlock it for us. */ 76 netdev_run_todo(); 77 } 78 EXPORT_SYMBOL(rtnl_unlock); 79 80 int rtnl_trylock(void) 81 { 82 return mutex_trylock(&rtnl_mutex); 83 } 84 EXPORT_SYMBOL(rtnl_trylock); 85 86 int rtnl_is_locked(void) 87 { 88 return mutex_is_locked(&rtnl_mutex); 89 } 90 EXPORT_SYMBOL(rtnl_is_locked); 91 92 #ifdef CONFIG_PROVE_LOCKING 93 int lockdep_rtnl_is_held(void) 94 { 95 return lockdep_is_held(&rtnl_mutex); 96 } 97 EXPORT_SYMBOL(lockdep_rtnl_is_held); 98 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 99 100 static struct rtnl_link *rtnl_msg_handlers[NPROTO]; 101 102 static inline int rtm_msgindex(int msgtype) 103 { 104 int msgindex = msgtype - RTM_BASE; 105 106 /* 107 * msgindex < 0 implies someone tried to register a netlink 108 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 109 * the message type has not been added to linux/rtnetlink.h 110 */ 111 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 112 113 return msgindex; 114 } 115 116 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 117 { 118 struct rtnl_link *tab; 119 120 tab = rtnl_msg_handlers[protocol]; 121 if (tab == NULL || tab[msgindex].doit == NULL) 122 tab = rtnl_msg_handlers[PF_UNSPEC]; 123 124 return tab ? tab[msgindex].doit : NULL; 125 } 126 127 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 128 { 129 struct rtnl_link *tab; 130 131 tab = rtnl_msg_handlers[protocol]; 132 if (tab == NULL || tab[msgindex].dumpit == NULL) 133 tab = rtnl_msg_handlers[PF_UNSPEC]; 134 135 return tab ? tab[msgindex].dumpit : NULL; 136 } 137 138 /** 139 * __rtnl_register - Register a rtnetlink message type 140 * @protocol: Protocol family or PF_UNSPEC 141 * @msgtype: rtnetlink message type 142 * @doit: Function pointer called for each request message 143 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 144 * 145 * Registers the specified function pointers (at least one of them has 146 * to be non-NULL) to be called whenever a request message for the 147 * specified protocol family and message type is received. 148 * 149 * The special protocol family PF_UNSPEC may be used to define fallback 150 * function pointers for the case when no entry for the specific protocol 151 * family exists. 152 * 153 * Returns 0 on success or a negative error code. 154 */ 155 int __rtnl_register(int protocol, int msgtype, 156 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 157 { 158 struct rtnl_link *tab; 159 int msgindex; 160 161 BUG_ON(protocol < 0 || protocol >= NPROTO); 162 msgindex = rtm_msgindex(msgtype); 163 164 tab = rtnl_msg_handlers[protocol]; 165 if (tab == NULL) { 166 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 167 if (tab == NULL) 168 return -ENOBUFS; 169 170 rtnl_msg_handlers[protocol] = tab; 171 } 172 173 if (doit) 174 tab[msgindex].doit = doit; 175 176 if (dumpit) 177 tab[msgindex].dumpit = dumpit; 178 179 return 0; 180 } 181 EXPORT_SYMBOL_GPL(__rtnl_register); 182 183 /** 184 * rtnl_register - Register a rtnetlink message type 185 * 186 * Identical to __rtnl_register() but panics on failure. This is useful 187 * as failure of this function is very unlikely, it can only happen due 188 * to lack of memory when allocating the chain to store all message 189 * handlers for a protocol. Meant for use in init functions where lack 190 * of memory implies no sense in continueing. 191 */ 192 void rtnl_register(int protocol, int msgtype, 193 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 194 { 195 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 196 panic("Unable to register rtnetlink message handler, " 197 "protocol = %d, message type = %d\n", 198 protocol, msgtype); 199 } 200 EXPORT_SYMBOL_GPL(rtnl_register); 201 202 /** 203 * rtnl_unregister - Unregister a rtnetlink message type 204 * @protocol: Protocol family or PF_UNSPEC 205 * @msgtype: rtnetlink message type 206 * 207 * Returns 0 on success or a negative error code. 208 */ 209 int rtnl_unregister(int protocol, int msgtype) 210 { 211 int msgindex; 212 213 BUG_ON(protocol < 0 || protocol >= NPROTO); 214 msgindex = rtm_msgindex(msgtype); 215 216 if (rtnl_msg_handlers[protocol] == NULL) 217 return -ENOENT; 218 219 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 220 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 221 222 return 0; 223 } 224 EXPORT_SYMBOL_GPL(rtnl_unregister); 225 226 /** 227 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 228 * @protocol : Protocol family or PF_UNSPEC 229 * 230 * Identical to calling rtnl_unregster() for all registered message types 231 * of a certain protocol family. 232 */ 233 void rtnl_unregister_all(int protocol) 234 { 235 BUG_ON(protocol < 0 || protocol >= NPROTO); 236 237 kfree(rtnl_msg_handlers[protocol]); 238 rtnl_msg_handlers[protocol] = NULL; 239 } 240 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 241 242 static LIST_HEAD(link_ops); 243 244 /** 245 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 246 * @ops: struct rtnl_link_ops * to register 247 * 248 * The caller must hold the rtnl_mutex. This function should be used 249 * by drivers that create devices during module initialization. It 250 * must be called before registering the devices. 251 * 252 * Returns 0 on success or a negative error code. 253 */ 254 int __rtnl_link_register(struct rtnl_link_ops *ops) 255 { 256 if (!ops->dellink) 257 ops->dellink = unregister_netdevice_queue; 258 259 list_add_tail(&ops->list, &link_ops); 260 return 0; 261 } 262 EXPORT_SYMBOL_GPL(__rtnl_link_register); 263 264 /** 265 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 266 * @ops: struct rtnl_link_ops * to register 267 * 268 * Returns 0 on success or a negative error code. 269 */ 270 int rtnl_link_register(struct rtnl_link_ops *ops) 271 { 272 int err; 273 274 rtnl_lock(); 275 err = __rtnl_link_register(ops); 276 rtnl_unlock(); 277 return err; 278 } 279 EXPORT_SYMBOL_GPL(rtnl_link_register); 280 281 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 282 { 283 struct net_device *dev; 284 LIST_HEAD(list_kill); 285 286 for_each_netdev(net, dev) { 287 if (dev->rtnl_link_ops == ops) 288 ops->dellink(dev, &list_kill); 289 } 290 unregister_netdevice_many(&list_kill); 291 } 292 293 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 294 { 295 rtnl_lock(); 296 __rtnl_kill_links(net, ops); 297 rtnl_unlock(); 298 } 299 EXPORT_SYMBOL_GPL(rtnl_kill_links); 300 301 /** 302 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 303 * @ops: struct rtnl_link_ops * to unregister 304 * 305 * The caller must hold the rtnl_mutex. 306 */ 307 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 308 { 309 struct net *net; 310 311 for_each_net(net) { 312 __rtnl_kill_links(net, ops); 313 } 314 list_del(&ops->list); 315 } 316 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 317 318 /** 319 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 320 * @ops: struct rtnl_link_ops * to unregister 321 */ 322 void rtnl_link_unregister(struct rtnl_link_ops *ops) 323 { 324 rtnl_lock(); 325 __rtnl_link_unregister(ops); 326 rtnl_unlock(); 327 } 328 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 329 330 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 331 { 332 const struct rtnl_link_ops *ops; 333 334 list_for_each_entry(ops, &link_ops, list) { 335 if (!strcmp(ops->kind, kind)) 336 return ops; 337 } 338 return NULL; 339 } 340 341 static size_t rtnl_link_get_size(const struct net_device *dev) 342 { 343 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 344 size_t size; 345 346 if (!ops) 347 return 0; 348 349 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 350 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 351 352 if (ops->get_size) 353 /* IFLA_INFO_DATA + nested data */ 354 size += nlmsg_total_size(sizeof(struct nlattr)) + 355 ops->get_size(dev); 356 357 if (ops->get_xstats_size) 358 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ 359 360 return size; 361 } 362 363 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 364 { 365 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 366 struct nlattr *linkinfo, *data; 367 int err = -EMSGSIZE; 368 369 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 370 if (linkinfo == NULL) 371 goto out; 372 373 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 374 goto err_cancel_link; 375 if (ops->fill_xstats) { 376 err = ops->fill_xstats(skb, dev); 377 if (err < 0) 378 goto err_cancel_link; 379 } 380 if (ops->fill_info) { 381 data = nla_nest_start(skb, IFLA_INFO_DATA); 382 if (data == NULL) 383 goto err_cancel_link; 384 err = ops->fill_info(skb, dev); 385 if (err < 0) 386 goto err_cancel_data; 387 nla_nest_end(skb, data); 388 } 389 390 nla_nest_end(skb, linkinfo); 391 return 0; 392 393 err_cancel_data: 394 nla_nest_cancel(skb, data); 395 err_cancel_link: 396 nla_nest_cancel(skb, linkinfo); 397 out: 398 return err; 399 } 400 401 static const int rtm_min[RTM_NR_FAMILIES] = 402 { 403 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 404 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 405 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 406 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 407 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 408 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 409 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 410 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 411 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 412 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 413 }; 414 415 static const int rta_max[RTM_NR_FAMILIES] = 416 { 417 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 418 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 419 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 420 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 421 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 422 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 423 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 424 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 425 }; 426 427 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 428 { 429 struct rtattr *rta; 430 int size = RTA_LENGTH(attrlen); 431 432 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); 433 rta->rta_type = attrtype; 434 rta->rta_len = size; 435 memcpy(RTA_DATA(rta), data, attrlen); 436 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 437 } 438 EXPORT_SYMBOL(__rta_fill); 439 440 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 441 { 442 struct sock *rtnl = net->rtnl; 443 int err = 0; 444 445 NETLINK_CB(skb).dst_group = group; 446 if (echo) 447 atomic_inc(&skb->users); 448 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 449 if (echo) 450 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 451 return err; 452 } 453 454 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 455 { 456 struct sock *rtnl = net->rtnl; 457 458 return nlmsg_unicast(rtnl, skb, pid); 459 } 460 EXPORT_SYMBOL(rtnl_unicast); 461 462 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 463 struct nlmsghdr *nlh, gfp_t flags) 464 { 465 struct sock *rtnl = net->rtnl; 466 int report = 0; 467 468 if (nlh) 469 report = nlmsg_report(nlh); 470 471 nlmsg_notify(rtnl, skb, pid, group, report, flags); 472 } 473 EXPORT_SYMBOL(rtnl_notify); 474 475 void rtnl_set_sk_err(struct net *net, u32 group, int error) 476 { 477 struct sock *rtnl = net->rtnl; 478 479 netlink_set_err(rtnl, 0, group, error); 480 } 481 EXPORT_SYMBOL(rtnl_set_sk_err); 482 483 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 484 { 485 struct nlattr *mx; 486 int i, valid = 0; 487 488 mx = nla_nest_start(skb, RTA_METRICS); 489 if (mx == NULL) 490 return -ENOBUFS; 491 492 for (i = 0; i < RTAX_MAX; i++) { 493 if (metrics[i]) { 494 valid++; 495 NLA_PUT_U32(skb, i+1, metrics[i]); 496 } 497 } 498 499 if (!valid) { 500 nla_nest_cancel(skb, mx); 501 return 0; 502 } 503 504 return nla_nest_end(skb, mx); 505 506 nla_put_failure: 507 nla_nest_cancel(skb, mx); 508 return -EMSGSIZE; 509 } 510 EXPORT_SYMBOL(rtnetlink_put_metrics); 511 512 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 513 u32 ts, u32 tsage, long expires, u32 error) 514 { 515 struct rta_cacheinfo ci = { 516 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 517 .rta_used = dst->__use, 518 .rta_clntref = atomic_read(&(dst->__refcnt)), 519 .rta_error = error, 520 .rta_id = id, 521 .rta_ts = ts, 522 .rta_tsage = tsage, 523 }; 524 525 if (expires) 526 ci.rta_expires = jiffies_to_clock_t(expires); 527 528 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 529 } 530 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 531 532 static void set_operstate(struct net_device *dev, unsigned char transition) 533 { 534 unsigned char operstate = dev->operstate; 535 536 switch (transition) { 537 case IF_OPER_UP: 538 if ((operstate == IF_OPER_DORMANT || 539 operstate == IF_OPER_UNKNOWN) && 540 !netif_dormant(dev)) 541 operstate = IF_OPER_UP; 542 break; 543 544 case IF_OPER_DORMANT: 545 if (operstate == IF_OPER_UP || 546 operstate == IF_OPER_UNKNOWN) 547 operstate = IF_OPER_DORMANT; 548 break; 549 } 550 551 if (dev->operstate != operstate) { 552 write_lock_bh(&dev_base_lock); 553 dev->operstate = operstate; 554 write_unlock_bh(&dev_base_lock); 555 netdev_state_change(dev); 556 } 557 } 558 559 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 560 const struct net_device_stats *b) 561 { 562 a->rx_packets = b->rx_packets; 563 a->tx_packets = b->tx_packets; 564 a->rx_bytes = b->rx_bytes; 565 a->tx_bytes = b->tx_bytes; 566 a->rx_errors = b->rx_errors; 567 a->tx_errors = b->tx_errors; 568 a->rx_dropped = b->rx_dropped; 569 a->tx_dropped = b->tx_dropped; 570 571 a->multicast = b->multicast; 572 a->collisions = b->collisions; 573 574 a->rx_length_errors = b->rx_length_errors; 575 a->rx_over_errors = b->rx_over_errors; 576 a->rx_crc_errors = b->rx_crc_errors; 577 a->rx_frame_errors = b->rx_frame_errors; 578 a->rx_fifo_errors = b->rx_fifo_errors; 579 a->rx_missed_errors = b->rx_missed_errors; 580 581 a->tx_aborted_errors = b->tx_aborted_errors; 582 a->tx_carrier_errors = b->tx_carrier_errors; 583 a->tx_fifo_errors = b->tx_fifo_errors; 584 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 585 a->tx_window_errors = b->tx_window_errors; 586 587 a->rx_compressed = b->rx_compressed; 588 a->tx_compressed = b->tx_compressed; 589 }; 590 591 static inline size_t if_nlmsg_size(const struct net_device *dev) 592 { 593 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 594 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 595 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 596 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 597 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 598 + nla_total_size(sizeof(struct rtnl_link_stats)) 599 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 600 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 601 + nla_total_size(4) /* IFLA_TXQLEN */ 602 + nla_total_size(4) /* IFLA_WEIGHT */ 603 + nla_total_size(4) /* IFLA_MTU */ 604 + nla_total_size(4) /* IFLA_LINK */ 605 + nla_total_size(4) /* IFLA_MASTER */ 606 + nla_total_size(1) /* IFLA_OPERSTATE */ 607 + nla_total_size(1) /* IFLA_LINKMODE */ 608 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 609 } 610 611 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 612 int type, u32 pid, u32 seq, u32 change, 613 unsigned int flags) 614 { 615 struct ifinfomsg *ifm; 616 struct nlmsghdr *nlh; 617 const struct net_device_stats *stats; 618 struct nlattr *attr; 619 620 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 621 if (nlh == NULL) 622 return -EMSGSIZE; 623 624 ifm = nlmsg_data(nlh); 625 ifm->ifi_family = AF_UNSPEC; 626 ifm->__ifi_pad = 0; 627 ifm->ifi_type = dev->type; 628 ifm->ifi_index = dev->ifindex; 629 ifm->ifi_flags = dev_get_flags(dev); 630 ifm->ifi_change = change; 631 632 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 633 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 634 NLA_PUT_U8(skb, IFLA_OPERSTATE, 635 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 636 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 637 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 638 639 if (dev->ifindex != dev->iflink) 640 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 641 642 if (dev->master) 643 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 644 645 if (dev->qdisc) 646 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 647 648 if (dev->ifalias) 649 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 650 651 if (1) { 652 struct rtnl_link_ifmap map = { 653 .mem_start = dev->mem_start, 654 .mem_end = dev->mem_end, 655 .base_addr = dev->base_addr, 656 .irq = dev->irq, 657 .dma = dev->dma, 658 .port = dev->if_port, 659 }; 660 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 661 } 662 663 if (dev->addr_len) { 664 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 665 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 666 } 667 668 attr = nla_reserve(skb, IFLA_STATS, 669 sizeof(struct rtnl_link_stats)); 670 if (attr == NULL) 671 goto nla_put_failure; 672 673 stats = dev_get_stats(dev); 674 copy_rtnl_link_stats(nla_data(attr), stats); 675 676 if (dev->rtnl_link_ops) { 677 if (rtnl_link_fill(skb, dev) < 0) 678 goto nla_put_failure; 679 } 680 681 return nlmsg_end(skb, nlh); 682 683 nla_put_failure: 684 nlmsg_cancel(skb, nlh); 685 return -EMSGSIZE; 686 } 687 688 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 689 { 690 struct net *net = sock_net(skb->sk); 691 int h, s_h; 692 int idx = 0, s_idx; 693 struct net_device *dev; 694 struct hlist_head *head; 695 struct hlist_node *node; 696 697 s_h = cb->args[0]; 698 s_idx = cb->args[1]; 699 700 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 701 idx = 0; 702 head = &net->dev_index_head[h]; 703 hlist_for_each_entry(dev, node, head, index_hlist) { 704 if (idx < s_idx) 705 goto cont; 706 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 707 NETLINK_CB(cb->skb).pid, 708 cb->nlh->nlmsg_seq, 0, 709 NLM_F_MULTI) <= 0) 710 goto out; 711 cont: 712 idx++; 713 } 714 } 715 out: 716 cb->args[1] = idx; 717 cb->args[0] = h; 718 719 return skb->len; 720 } 721 722 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 723 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 724 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 725 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 726 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 727 [IFLA_MTU] = { .type = NLA_U32 }, 728 [IFLA_LINK] = { .type = NLA_U32 }, 729 [IFLA_TXQLEN] = { .type = NLA_U32 }, 730 [IFLA_WEIGHT] = { .type = NLA_U32 }, 731 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 732 [IFLA_LINKMODE] = { .type = NLA_U8 }, 733 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 734 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 735 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 736 }; 737 EXPORT_SYMBOL(ifla_policy); 738 739 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 740 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 741 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 742 }; 743 744 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 745 { 746 struct net *net; 747 /* Examine the link attributes and figure out which 748 * network namespace we are talking about. 749 */ 750 if (tb[IFLA_NET_NS_PID]) 751 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 752 else 753 net = get_net(src_net); 754 return net; 755 } 756 EXPORT_SYMBOL(rtnl_link_get_net); 757 758 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 759 { 760 if (dev) { 761 if (tb[IFLA_ADDRESS] && 762 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 763 return -EINVAL; 764 765 if (tb[IFLA_BROADCAST] && 766 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 767 return -EINVAL; 768 } 769 770 return 0; 771 } 772 773 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 774 struct nlattr **tb, char *ifname, int modified) 775 { 776 const struct net_device_ops *ops = dev->netdev_ops; 777 int send_addr_notify = 0; 778 int err; 779 780 if (tb[IFLA_NET_NS_PID]) { 781 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 782 if (IS_ERR(net)) { 783 err = PTR_ERR(net); 784 goto errout; 785 } 786 err = dev_change_net_namespace(dev, net, ifname); 787 put_net(net); 788 if (err) 789 goto errout; 790 modified = 1; 791 } 792 793 if (tb[IFLA_MAP]) { 794 struct rtnl_link_ifmap *u_map; 795 struct ifmap k_map; 796 797 if (!ops->ndo_set_config) { 798 err = -EOPNOTSUPP; 799 goto errout; 800 } 801 802 if (!netif_device_present(dev)) { 803 err = -ENODEV; 804 goto errout; 805 } 806 807 u_map = nla_data(tb[IFLA_MAP]); 808 k_map.mem_start = (unsigned long) u_map->mem_start; 809 k_map.mem_end = (unsigned long) u_map->mem_end; 810 k_map.base_addr = (unsigned short) u_map->base_addr; 811 k_map.irq = (unsigned char) u_map->irq; 812 k_map.dma = (unsigned char) u_map->dma; 813 k_map.port = (unsigned char) u_map->port; 814 815 err = ops->ndo_set_config(dev, &k_map); 816 if (err < 0) 817 goto errout; 818 819 modified = 1; 820 } 821 822 if (tb[IFLA_ADDRESS]) { 823 struct sockaddr *sa; 824 int len; 825 826 if (!ops->ndo_set_mac_address) { 827 err = -EOPNOTSUPP; 828 goto errout; 829 } 830 831 if (!netif_device_present(dev)) { 832 err = -ENODEV; 833 goto errout; 834 } 835 836 len = sizeof(sa_family_t) + dev->addr_len; 837 sa = kmalloc(len, GFP_KERNEL); 838 if (!sa) { 839 err = -ENOMEM; 840 goto errout; 841 } 842 sa->sa_family = dev->type; 843 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 844 dev->addr_len); 845 err = ops->ndo_set_mac_address(dev, sa); 846 kfree(sa); 847 if (err) 848 goto errout; 849 send_addr_notify = 1; 850 modified = 1; 851 } 852 853 if (tb[IFLA_MTU]) { 854 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 855 if (err < 0) 856 goto errout; 857 modified = 1; 858 } 859 860 /* 861 * Interface selected by interface index but interface 862 * name provided implies that a name change has been 863 * requested. 864 */ 865 if (ifm->ifi_index > 0 && ifname[0]) { 866 err = dev_change_name(dev, ifname); 867 if (err < 0) 868 goto errout; 869 modified = 1; 870 } 871 872 if (tb[IFLA_IFALIAS]) { 873 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 874 nla_len(tb[IFLA_IFALIAS])); 875 if (err < 0) 876 goto errout; 877 modified = 1; 878 } 879 880 if (tb[IFLA_BROADCAST]) { 881 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 882 send_addr_notify = 1; 883 } 884 885 if (ifm->ifi_flags || ifm->ifi_change) { 886 unsigned int flags = ifm->ifi_flags; 887 888 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 889 if (ifm->ifi_change) 890 flags = (flags & ifm->ifi_change) | 891 (dev->flags & ~ifm->ifi_change); 892 err = dev_change_flags(dev, flags); 893 if (err < 0) 894 goto errout; 895 } 896 897 if (tb[IFLA_TXQLEN]) 898 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 899 900 if (tb[IFLA_OPERSTATE]) 901 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 902 903 if (tb[IFLA_LINKMODE]) { 904 write_lock_bh(&dev_base_lock); 905 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 906 write_unlock_bh(&dev_base_lock); 907 } 908 909 err = 0; 910 911 errout: 912 if (err < 0 && modified && net_ratelimit()) 913 printk(KERN_WARNING "A link change request failed with " 914 "some changes comitted already. Interface %s may " 915 "have been left with an inconsistent configuration, " 916 "please check.\n", dev->name); 917 918 if (send_addr_notify) 919 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 920 return err; 921 } 922 923 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 924 { 925 struct net *net = sock_net(skb->sk); 926 struct ifinfomsg *ifm; 927 struct net_device *dev; 928 int err; 929 struct nlattr *tb[IFLA_MAX+1]; 930 char ifname[IFNAMSIZ]; 931 932 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 933 if (err < 0) 934 goto errout; 935 936 if (tb[IFLA_IFNAME]) 937 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 938 else 939 ifname[0] = '\0'; 940 941 err = -EINVAL; 942 ifm = nlmsg_data(nlh); 943 if (ifm->ifi_index > 0) 944 dev = __dev_get_by_index(net, ifm->ifi_index); 945 else if (tb[IFLA_IFNAME]) 946 dev = __dev_get_by_name(net, ifname); 947 else 948 goto errout; 949 950 if (dev == NULL) { 951 err = -ENODEV; 952 goto errout; 953 } 954 955 err = validate_linkmsg(dev, tb); 956 if (err < 0) 957 goto errout; 958 959 err = do_setlink(dev, ifm, tb, ifname, 0); 960 errout: 961 return err; 962 } 963 964 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 965 { 966 struct net *net = sock_net(skb->sk); 967 const struct rtnl_link_ops *ops; 968 struct net_device *dev; 969 struct ifinfomsg *ifm; 970 char ifname[IFNAMSIZ]; 971 struct nlattr *tb[IFLA_MAX+1]; 972 int err; 973 974 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 975 if (err < 0) 976 return err; 977 978 if (tb[IFLA_IFNAME]) 979 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 980 981 ifm = nlmsg_data(nlh); 982 if (ifm->ifi_index > 0) 983 dev = __dev_get_by_index(net, ifm->ifi_index); 984 else if (tb[IFLA_IFNAME]) 985 dev = __dev_get_by_name(net, ifname); 986 else 987 return -EINVAL; 988 989 if (!dev) 990 return -ENODEV; 991 992 ops = dev->rtnl_link_ops; 993 if (!ops) 994 return -EOPNOTSUPP; 995 996 ops->dellink(dev, NULL); 997 return 0; 998 } 999 1000 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1001 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1002 { 1003 int err; 1004 struct net_device *dev; 1005 unsigned int num_queues = 1; 1006 unsigned int real_num_queues = 1; 1007 1008 if (ops->get_tx_queues) { 1009 err = ops->get_tx_queues(src_net, tb, &num_queues, 1010 &real_num_queues); 1011 if (err) 1012 goto err; 1013 } 1014 err = -ENOMEM; 1015 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1016 if (!dev) 1017 goto err; 1018 1019 dev_net_set(dev, net); 1020 dev->rtnl_link_ops = ops; 1021 dev->real_num_tx_queues = real_num_queues; 1022 1023 if (strchr(dev->name, '%')) { 1024 err = dev_alloc_name(dev, dev->name); 1025 if (err < 0) 1026 goto err_free; 1027 } 1028 1029 if (tb[IFLA_MTU]) 1030 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1031 if (tb[IFLA_ADDRESS]) 1032 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1033 nla_len(tb[IFLA_ADDRESS])); 1034 if (tb[IFLA_BROADCAST]) 1035 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1036 nla_len(tb[IFLA_BROADCAST])); 1037 if (tb[IFLA_TXQLEN]) 1038 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1039 if (tb[IFLA_OPERSTATE]) 1040 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1041 if (tb[IFLA_LINKMODE]) 1042 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1043 1044 return dev; 1045 1046 err_free: 1047 free_netdev(dev); 1048 err: 1049 return ERR_PTR(err); 1050 } 1051 EXPORT_SYMBOL(rtnl_create_link); 1052 1053 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1054 { 1055 struct net *net = sock_net(skb->sk); 1056 const struct rtnl_link_ops *ops; 1057 struct net_device *dev; 1058 struct ifinfomsg *ifm; 1059 char kind[MODULE_NAME_LEN]; 1060 char ifname[IFNAMSIZ]; 1061 struct nlattr *tb[IFLA_MAX+1]; 1062 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1063 int err; 1064 1065 #ifdef CONFIG_MODULES 1066 replay: 1067 #endif 1068 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1069 if (err < 0) 1070 return err; 1071 1072 if (tb[IFLA_IFNAME]) 1073 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1074 else 1075 ifname[0] = '\0'; 1076 1077 ifm = nlmsg_data(nlh); 1078 if (ifm->ifi_index > 0) 1079 dev = __dev_get_by_index(net, ifm->ifi_index); 1080 else if (ifname[0]) 1081 dev = __dev_get_by_name(net, ifname); 1082 else 1083 dev = NULL; 1084 1085 err = validate_linkmsg(dev, tb); 1086 if (err < 0) 1087 return err; 1088 1089 if (tb[IFLA_LINKINFO]) { 1090 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1091 tb[IFLA_LINKINFO], ifla_info_policy); 1092 if (err < 0) 1093 return err; 1094 } else 1095 memset(linkinfo, 0, sizeof(linkinfo)); 1096 1097 if (linkinfo[IFLA_INFO_KIND]) { 1098 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1099 ops = rtnl_link_ops_get(kind); 1100 } else { 1101 kind[0] = '\0'; 1102 ops = NULL; 1103 } 1104 1105 if (1) { 1106 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1107 struct net *dest_net; 1108 1109 if (ops) { 1110 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1111 err = nla_parse_nested(attr, ops->maxtype, 1112 linkinfo[IFLA_INFO_DATA], 1113 ops->policy); 1114 if (err < 0) 1115 return err; 1116 data = attr; 1117 } 1118 if (ops->validate) { 1119 err = ops->validate(tb, data); 1120 if (err < 0) 1121 return err; 1122 } 1123 } 1124 1125 if (dev) { 1126 int modified = 0; 1127 1128 if (nlh->nlmsg_flags & NLM_F_EXCL) 1129 return -EEXIST; 1130 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1131 return -EOPNOTSUPP; 1132 1133 if (linkinfo[IFLA_INFO_DATA]) { 1134 if (!ops || ops != dev->rtnl_link_ops || 1135 !ops->changelink) 1136 return -EOPNOTSUPP; 1137 1138 err = ops->changelink(dev, tb, data); 1139 if (err < 0) 1140 return err; 1141 modified = 1; 1142 } 1143 1144 return do_setlink(dev, ifm, tb, ifname, modified); 1145 } 1146 1147 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1148 return -ENODEV; 1149 1150 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) 1151 return -EOPNOTSUPP; 1152 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1153 return -EOPNOTSUPP; 1154 1155 if (!ops) { 1156 #ifdef CONFIG_MODULES 1157 if (kind[0]) { 1158 __rtnl_unlock(); 1159 request_module("rtnl-link-%s", kind); 1160 rtnl_lock(); 1161 ops = rtnl_link_ops_get(kind); 1162 if (ops) 1163 goto replay; 1164 } 1165 #endif 1166 return -EOPNOTSUPP; 1167 } 1168 1169 if (!ifname[0]) 1170 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1171 1172 dest_net = rtnl_link_get_net(net, tb); 1173 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1174 1175 if (IS_ERR(dev)) 1176 err = PTR_ERR(dev); 1177 else if (ops->newlink) 1178 err = ops->newlink(net, dev, tb, data); 1179 else 1180 err = register_netdevice(dev); 1181 if (err < 0 && !IS_ERR(dev)) 1182 free_netdev(dev); 1183 1184 put_net(dest_net); 1185 return err; 1186 } 1187 } 1188 1189 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1190 { 1191 struct net *net = sock_net(skb->sk); 1192 struct ifinfomsg *ifm; 1193 char ifname[IFNAMSIZ]; 1194 struct nlattr *tb[IFLA_MAX+1]; 1195 struct net_device *dev = NULL; 1196 struct sk_buff *nskb; 1197 int err; 1198 1199 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1200 if (err < 0) 1201 return err; 1202 1203 if (tb[IFLA_IFNAME]) 1204 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1205 1206 ifm = nlmsg_data(nlh); 1207 if (ifm->ifi_index > 0) 1208 dev = __dev_get_by_index(net, ifm->ifi_index); 1209 else if (tb[IFLA_IFNAME]) 1210 dev = __dev_get_by_name(net, ifname); 1211 else 1212 return -EINVAL; 1213 1214 if (dev == NULL) 1215 return -ENODEV; 1216 1217 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1218 if (nskb == NULL) 1219 return -ENOBUFS; 1220 1221 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1222 nlh->nlmsg_seq, 0, 0); 1223 if (err < 0) { 1224 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1225 WARN_ON(err == -EMSGSIZE); 1226 kfree_skb(nskb); 1227 } else 1228 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1229 1230 return err; 1231 } 1232 1233 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1234 { 1235 int idx; 1236 int s_idx = cb->family; 1237 1238 if (s_idx == 0) 1239 s_idx = 1; 1240 for (idx = 1; idx < NPROTO; idx++) { 1241 int type = cb->nlh->nlmsg_type-RTM_BASE; 1242 if (idx < s_idx || idx == PF_PACKET) 1243 continue; 1244 if (rtnl_msg_handlers[idx] == NULL || 1245 rtnl_msg_handlers[idx][type].dumpit == NULL) 1246 continue; 1247 if (idx > s_idx) 1248 memset(&cb->args[0], 0, sizeof(cb->args)); 1249 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1250 break; 1251 } 1252 cb->family = idx; 1253 1254 return skb->len; 1255 } 1256 1257 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1258 { 1259 struct net *net = dev_net(dev); 1260 struct sk_buff *skb; 1261 int err = -ENOBUFS; 1262 1263 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1264 if (skb == NULL) 1265 goto errout; 1266 1267 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1268 if (err < 0) { 1269 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1270 WARN_ON(err == -EMSGSIZE); 1271 kfree_skb(skb); 1272 goto errout; 1273 } 1274 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1275 return; 1276 errout: 1277 if (err < 0) 1278 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1279 } 1280 1281 /* Protected by RTNL sempahore. */ 1282 static struct rtattr **rta_buf; 1283 static int rtattr_max; 1284 1285 /* Process one rtnetlink message. */ 1286 1287 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1288 { 1289 struct net *net = sock_net(skb->sk); 1290 rtnl_doit_func doit; 1291 int sz_idx, kind; 1292 int min_len; 1293 int family; 1294 int type; 1295 int err; 1296 1297 type = nlh->nlmsg_type; 1298 if (type > RTM_MAX) 1299 return -EOPNOTSUPP; 1300 1301 type -= RTM_BASE; 1302 1303 /* All the messages must have at least 1 byte length */ 1304 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1305 return 0; 1306 1307 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1308 if (family >= NPROTO) 1309 return -EAFNOSUPPORT; 1310 1311 sz_idx = type>>2; 1312 kind = type&3; 1313 1314 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1315 return -EPERM; 1316 1317 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1318 struct sock *rtnl; 1319 rtnl_dumpit_func dumpit; 1320 1321 dumpit = rtnl_get_dumpit(family, type); 1322 if (dumpit == NULL) 1323 return -EOPNOTSUPP; 1324 1325 __rtnl_unlock(); 1326 rtnl = net->rtnl; 1327 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1328 rtnl_lock(); 1329 return err; 1330 } 1331 1332 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1333 1334 min_len = rtm_min[sz_idx]; 1335 if (nlh->nlmsg_len < min_len) 1336 return -EINVAL; 1337 1338 if (nlh->nlmsg_len > min_len) { 1339 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1340 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1341 1342 while (RTA_OK(attr, attrlen)) { 1343 unsigned flavor = attr->rta_type; 1344 if (flavor) { 1345 if (flavor > rta_max[sz_idx]) 1346 return -EINVAL; 1347 rta_buf[flavor-1] = attr; 1348 } 1349 attr = RTA_NEXT(attr, attrlen); 1350 } 1351 } 1352 1353 doit = rtnl_get_doit(family, type); 1354 if (doit == NULL) 1355 return -EOPNOTSUPP; 1356 1357 return doit(skb, nlh, (void *)&rta_buf[0]); 1358 } 1359 1360 static void rtnetlink_rcv(struct sk_buff *skb) 1361 { 1362 rtnl_lock(); 1363 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1364 rtnl_unlock(); 1365 } 1366 1367 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1368 { 1369 struct net_device *dev = ptr; 1370 1371 switch (event) { 1372 case NETDEV_UNREGISTER: 1373 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 1374 break; 1375 case NETDEV_UP: 1376 case NETDEV_DOWN: 1377 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 1378 break; 1379 case NETDEV_POST_INIT: 1380 case NETDEV_REGISTER: 1381 case NETDEV_CHANGE: 1382 case NETDEV_GOING_DOWN: 1383 case NETDEV_UNREGISTER_BATCH: 1384 break; 1385 default: 1386 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1387 break; 1388 } 1389 return NOTIFY_DONE; 1390 } 1391 1392 static struct notifier_block rtnetlink_dev_notifier = { 1393 .notifier_call = rtnetlink_event, 1394 }; 1395 1396 1397 static int rtnetlink_net_init(struct net *net) 1398 { 1399 struct sock *sk; 1400 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1401 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1402 if (!sk) 1403 return -ENOMEM; 1404 net->rtnl = sk; 1405 return 0; 1406 } 1407 1408 static void rtnetlink_net_exit(struct net *net) 1409 { 1410 netlink_kernel_release(net->rtnl); 1411 net->rtnl = NULL; 1412 } 1413 1414 static struct pernet_operations rtnetlink_net_ops = { 1415 .init = rtnetlink_net_init, 1416 .exit = rtnetlink_net_exit, 1417 }; 1418 1419 void __init rtnetlink_init(void) 1420 { 1421 int i; 1422 1423 rtattr_max = 0; 1424 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1425 if (rta_max[i] > rtattr_max) 1426 rtattr_max = rta_max[i]; 1427 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1428 if (!rta_buf) 1429 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1430 1431 if (register_pernet_subsys(&rtnetlink_net_ops)) 1432 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1433 1434 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1435 register_netdevice_notifier(&rtnetlink_dev_notifier); 1436 1437 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1438 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1439 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1440 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1441 1442 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1443 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1444 } 1445 1446