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