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 void set_operstate(struct net_device *dev, unsigned char transition) 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 netdev_state_change(dev); 531 } 532 } 533 534 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 535 struct net_device_stats *b) 536 { 537 a->rx_packets = b->rx_packets; 538 a->tx_packets = b->tx_packets; 539 a->rx_bytes = b->rx_bytes; 540 a->tx_bytes = b->tx_bytes; 541 a->rx_errors = b->rx_errors; 542 a->tx_errors = b->tx_errors; 543 a->rx_dropped = b->rx_dropped; 544 a->tx_dropped = b->tx_dropped; 545 546 a->multicast = b->multicast; 547 a->collisions = b->collisions; 548 549 a->rx_length_errors = b->rx_length_errors; 550 a->rx_over_errors = b->rx_over_errors; 551 a->rx_crc_errors = b->rx_crc_errors; 552 a->rx_frame_errors = b->rx_frame_errors; 553 a->rx_fifo_errors = b->rx_fifo_errors; 554 a->rx_missed_errors = b->rx_missed_errors; 555 556 a->tx_aborted_errors = b->tx_aborted_errors; 557 a->tx_carrier_errors = b->tx_carrier_errors; 558 a->tx_fifo_errors = b->tx_fifo_errors; 559 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 560 a->tx_window_errors = b->tx_window_errors; 561 562 a->rx_compressed = b->rx_compressed; 563 a->tx_compressed = b->tx_compressed; 564 }; 565 566 static inline size_t if_nlmsg_size(const struct net_device *dev) 567 { 568 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 569 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 570 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 571 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 572 + nla_total_size(sizeof(struct rtnl_link_stats)) 573 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 574 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 575 + nla_total_size(4) /* IFLA_TXQLEN */ 576 + nla_total_size(4) /* IFLA_WEIGHT */ 577 + nla_total_size(4) /* IFLA_MTU */ 578 + nla_total_size(4) /* IFLA_LINK */ 579 + nla_total_size(4) /* IFLA_MASTER */ 580 + nla_total_size(1) /* IFLA_OPERSTATE */ 581 + nla_total_size(1) /* IFLA_LINKMODE */ 582 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 583 } 584 585 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 586 int type, u32 pid, u32 seq, u32 change, 587 unsigned int flags) 588 { 589 struct ifinfomsg *ifm; 590 struct nlmsghdr *nlh; 591 592 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 593 if (nlh == NULL) 594 return -EMSGSIZE; 595 596 ifm = nlmsg_data(nlh); 597 ifm->ifi_family = AF_UNSPEC; 598 ifm->__ifi_pad = 0; 599 ifm->ifi_type = dev->type; 600 ifm->ifi_index = dev->ifindex; 601 ifm->ifi_flags = dev_get_flags(dev); 602 ifm->ifi_change = change; 603 604 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 605 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 606 NLA_PUT_U8(skb, IFLA_OPERSTATE, 607 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 608 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 609 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 610 611 if (dev->ifindex != dev->iflink) 612 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 613 614 if (dev->master) 615 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 616 617 if (dev->qdisc_sleeping) 618 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); 619 620 if (1) { 621 struct rtnl_link_ifmap map = { 622 .mem_start = dev->mem_start, 623 .mem_end = dev->mem_end, 624 .base_addr = dev->base_addr, 625 .irq = dev->irq, 626 .dma = dev->dma, 627 .port = dev->if_port, 628 }; 629 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 630 } 631 632 if (dev->addr_len) { 633 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 634 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 635 } 636 637 if (dev->get_stats) { 638 struct net_device_stats *stats = dev->get_stats(dev); 639 if (stats) { 640 struct nlattr *attr; 641 642 attr = nla_reserve(skb, IFLA_STATS, 643 sizeof(struct rtnl_link_stats)); 644 if (attr == NULL) 645 goto nla_put_failure; 646 647 copy_rtnl_link_stats(nla_data(attr), stats); 648 } 649 } 650 651 if (dev->rtnl_link_ops) { 652 if (rtnl_link_fill(skb, dev) < 0) 653 goto nla_put_failure; 654 } 655 656 return nlmsg_end(skb, nlh); 657 658 nla_put_failure: 659 nlmsg_cancel(skb, nlh); 660 return -EMSGSIZE; 661 } 662 663 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 664 { 665 struct net *net = skb->sk->sk_net; 666 int idx; 667 int s_idx = cb->args[0]; 668 struct net_device *dev; 669 670 idx = 0; 671 for_each_netdev(net, dev) { 672 if (idx < s_idx) 673 goto cont; 674 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 675 NETLINK_CB(cb->skb).pid, 676 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) 677 break; 678 cont: 679 idx++; 680 } 681 cb->args[0] = idx; 682 683 return skb->len; 684 } 685 686 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 687 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 688 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 689 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 690 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 691 [IFLA_MTU] = { .type = NLA_U32 }, 692 [IFLA_LINK] = { .type = NLA_U32 }, 693 [IFLA_TXQLEN] = { .type = NLA_U32 }, 694 [IFLA_WEIGHT] = { .type = NLA_U32 }, 695 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 696 [IFLA_LINKMODE] = { .type = NLA_U8 }, 697 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 698 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 699 }; 700 701 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 702 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 703 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 704 }; 705 706 static struct net *get_net_ns_by_pid(pid_t pid) 707 { 708 struct task_struct *tsk; 709 struct net *net; 710 711 /* Lookup the network namespace */ 712 net = ERR_PTR(-ESRCH); 713 rcu_read_lock(); 714 tsk = find_task_by_vpid(pid); 715 if (tsk) { 716 struct nsproxy *nsproxy; 717 nsproxy = task_nsproxy(tsk); 718 if (nsproxy) 719 net = get_net(nsproxy->net_ns); 720 } 721 rcu_read_unlock(); 722 return net; 723 } 724 725 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 726 { 727 if (dev) { 728 if (tb[IFLA_ADDRESS] && 729 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 730 return -EINVAL; 731 732 if (tb[IFLA_BROADCAST] && 733 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 734 return -EINVAL; 735 } 736 737 return 0; 738 } 739 740 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 741 struct nlattr **tb, char *ifname, int modified) 742 { 743 int send_addr_notify = 0; 744 int err; 745 746 if (tb[IFLA_NET_NS_PID]) { 747 struct net *net; 748 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 749 if (IS_ERR(net)) { 750 err = PTR_ERR(net); 751 goto errout; 752 } 753 err = dev_change_net_namespace(dev, net, ifname); 754 put_net(net); 755 if (err) 756 goto errout; 757 modified = 1; 758 } 759 760 if (tb[IFLA_MAP]) { 761 struct rtnl_link_ifmap *u_map; 762 struct ifmap k_map; 763 764 if (!dev->set_config) { 765 err = -EOPNOTSUPP; 766 goto errout; 767 } 768 769 if (!netif_device_present(dev)) { 770 err = -ENODEV; 771 goto errout; 772 } 773 774 u_map = nla_data(tb[IFLA_MAP]); 775 k_map.mem_start = (unsigned long) u_map->mem_start; 776 k_map.mem_end = (unsigned long) u_map->mem_end; 777 k_map.base_addr = (unsigned short) u_map->base_addr; 778 k_map.irq = (unsigned char) u_map->irq; 779 k_map.dma = (unsigned char) u_map->dma; 780 k_map.port = (unsigned char) u_map->port; 781 782 err = dev->set_config(dev, &k_map); 783 if (err < 0) 784 goto errout; 785 786 modified = 1; 787 } 788 789 if (tb[IFLA_ADDRESS]) { 790 struct sockaddr *sa; 791 int len; 792 793 if (!dev->set_mac_address) { 794 err = -EOPNOTSUPP; 795 goto errout; 796 } 797 798 if (!netif_device_present(dev)) { 799 err = -ENODEV; 800 goto errout; 801 } 802 803 len = sizeof(sa_family_t) + dev->addr_len; 804 sa = kmalloc(len, GFP_KERNEL); 805 if (!sa) { 806 err = -ENOMEM; 807 goto errout; 808 } 809 sa->sa_family = dev->type; 810 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 811 dev->addr_len); 812 err = dev->set_mac_address(dev, sa); 813 kfree(sa); 814 if (err) 815 goto errout; 816 send_addr_notify = 1; 817 modified = 1; 818 } 819 820 if (tb[IFLA_MTU]) { 821 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 822 if (err < 0) 823 goto errout; 824 modified = 1; 825 } 826 827 /* 828 * Interface selected by interface index but interface 829 * name provided implies that a name change has been 830 * requested. 831 */ 832 if (ifm->ifi_index > 0 && ifname[0]) { 833 err = dev_change_name(dev, ifname); 834 if (err < 0) 835 goto errout; 836 modified = 1; 837 } 838 839 if (tb[IFLA_BROADCAST]) { 840 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 841 send_addr_notify = 1; 842 } 843 844 if (ifm->ifi_flags || ifm->ifi_change) { 845 unsigned int flags = ifm->ifi_flags; 846 847 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 848 if (ifm->ifi_change) 849 flags = (flags & ifm->ifi_change) | 850 (dev->flags & ~ifm->ifi_change); 851 dev_change_flags(dev, flags); 852 } 853 854 if (tb[IFLA_TXQLEN]) 855 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 856 857 if (tb[IFLA_OPERSTATE]) 858 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 859 860 if (tb[IFLA_LINKMODE]) { 861 write_lock_bh(&dev_base_lock); 862 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 863 write_unlock_bh(&dev_base_lock); 864 } 865 866 err = 0; 867 868 errout: 869 if (err < 0 && modified && net_ratelimit()) 870 printk(KERN_WARNING "A link change request failed with " 871 "some changes comitted already. Interface %s may " 872 "have been left with an inconsistent configuration, " 873 "please check.\n", dev->name); 874 875 if (send_addr_notify) 876 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 877 return err; 878 } 879 880 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 881 { 882 struct net *net = skb->sk->sk_net; 883 struct ifinfomsg *ifm; 884 struct net_device *dev; 885 int err; 886 struct nlattr *tb[IFLA_MAX+1]; 887 char ifname[IFNAMSIZ]; 888 889 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 890 if (err < 0) 891 goto errout; 892 893 if (tb[IFLA_IFNAME]) 894 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 895 else 896 ifname[0] = '\0'; 897 898 err = -EINVAL; 899 ifm = nlmsg_data(nlh); 900 if (ifm->ifi_index > 0) 901 dev = dev_get_by_index(net, ifm->ifi_index); 902 else if (tb[IFLA_IFNAME]) 903 dev = dev_get_by_name(net, ifname); 904 else 905 goto errout; 906 907 if (dev == NULL) { 908 err = -ENODEV; 909 goto errout; 910 } 911 912 if ((err = validate_linkmsg(dev, tb)) < 0) 913 goto errout_dev; 914 915 err = do_setlink(dev, ifm, tb, ifname, 0); 916 errout_dev: 917 dev_put(dev); 918 errout: 919 return err; 920 } 921 922 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 923 { 924 struct net *net = skb->sk->sk_net; 925 const struct rtnl_link_ops *ops; 926 struct net_device *dev; 927 struct ifinfomsg *ifm; 928 char ifname[IFNAMSIZ]; 929 struct nlattr *tb[IFLA_MAX+1]; 930 int err; 931 932 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 933 if (err < 0) 934 return err; 935 936 if (tb[IFLA_IFNAME]) 937 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 938 939 ifm = nlmsg_data(nlh); 940 if (ifm->ifi_index > 0) 941 dev = __dev_get_by_index(net, ifm->ifi_index); 942 else if (tb[IFLA_IFNAME]) 943 dev = __dev_get_by_name(net, ifname); 944 else 945 return -EINVAL; 946 947 if (!dev) 948 return -ENODEV; 949 950 ops = dev->rtnl_link_ops; 951 if (!ops) 952 return -EOPNOTSUPP; 953 954 ops->dellink(dev); 955 return 0; 956 } 957 958 struct net_device *rtnl_create_link(struct net *net, char *ifname, 959 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 960 { 961 int err; 962 struct net_device *dev; 963 964 err = -ENOMEM; 965 dev = alloc_netdev(ops->priv_size, ifname, ops->setup); 966 if (!dev) 967 goto err; 968 969 if (strchr(dev->name, '%')) { 970 err = dev_alloc_name(dev, dev->name); 971 if (err < 0) 972 goto err_free; 973 } 974 975 dev->nd_net = net; 976 dev->rtnl_link_ops = ops; 977 978 if (tb[IFLA_MTU]) 979 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 980 if (tb[IFLA_ADDRESS]) 981 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 982 nla_len(tb[IFLA_ADDRESS])); 983 if (tb[IFLA_BROADCAST]) 984 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 985 nla_len(tb[IFLA_BROADCAST])); 986 if (tb[IFLA_TXQLEN]) 987 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 988 if (tb[IFLA_OPERSTATE]) 989 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 990 if (tb[IFLA_LINKMODE]) 991 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 992 993 return dev; 994 995 err_free: 996 free_netdev(dev); 997 err: 998 return ERR_PTR(err); 999 } 1000 1001 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1002 { 1003 struct net *net = skb->sk->sk_net; 1004 const struct rtnl_link_ops *ops; 1005 struct net_device *dev; 1006 struct ifinfomsg *ifm; 1007 char kind[MODULE_NAME_LEN]; 1008 char ifname[IFNAMSIZ]; 1009 struct nlattr *tb[IFLA_MAX+1]; 1010 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1011 int err; 1012 1013 #ifdef CONFIG_KMOD 1014 replay: 1015 #endif 1016 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1017 if (err < 0) 1018 return err; 1019 1020 if (tb[IFLA_IFNAME]) 1021 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1022 else 1023 ifname[0] = '\0'; 1024 1025 ifm = nlmsg_data(nlh); 1026 if (ifm->ifi_index > 0) 1027 dev = __dev_get_by_index(net, ifm->ifi_index); 1028 else if (ifname[0]) 1029 dev = __dev_get_by_name(net, ifname); 1030 else 1031 dev = NULL; 1032 1033 if ((err = validate_linkmsg(dev, tb)) < 0) 1034 return err; 1035 1036 if (tb[IFLA_LINKINFO]) { 1037 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1038 tb[IFLA_LINKINFO], ifla_info_policy); 1039 if (err < 0) 1040 return err; 1041 } else 1042 memset(linkinfo, 0, sizeof(linkinfo)); 1043 1044 if (linkinfo[IFLA_INFO_KIND]) { 1045 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1046 ops = rtnl_link_ops_get(kind); 1047 } else { 1048 kind[0] = '\0'; 1049 ops = NULL; 1050 } 1051 1052 if (1) { 1053 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1054 1055 if (ops) { 1056 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1057 err = nla_parse_nested(attr, ops->maxtype, 1058 linkinfo[IFLA_INFO_DATA], 1059 ops->policy); 1060 if (err < 0) 1061 return err; 1062 data = attr; 1063 } 1064 if (ops->validate) { 1065 err = ops->validate(tb, data); 1066 if (err < 0) 1067 return err; 1068 } 1069 } 1070 1071 if (dev) { 1072 int modified = 0; 1073 1074 if (nlh->nlmsg_flags & NLM_F_EXCL) 1075 return -EEXIST; 1076 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1077 return -EOPNOTSUPP; 1078 1079 if (linkinfo[IFLA_INFO_DATA]) { 1080 if (!ops || ops != dev->rtnl_link_ops || 1081 !ops->changelink) 1082 return -EOPNOTSUPP; 1083 1084 err = ops->changelink(dev, tb, data); 1085 if (err < 0) 1086 return err; 1087 modified = 1; 1088 } 1089 1090 return do_setlink(dev, ifm, tb, ifname, modified); 1091 } 1092 1093 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1094 return -ENODEV; 1095 1096 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) 1097 return -EOPNOTSUPP; 1098 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1099 return -EOPNOTSUPP; 1100 1101 if (!ops) { 1102 #ifdef CONFIG_KMOD 1103 if (kind[0]) { 1104 __rtnl_unlock(); 1105 request_module("rtnl-link-%s", kind); 1106 rtnl_lock(); 1107 ops = rtnl_link_ops_get(kind); 1108 if (ops) 1109 goto replay; 1110 } 1111 #endif 1112 return -EOPNOTSUPP; 1113 } 1114 1115 if (!ifname[0]) 1116 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1117 1118 dev = rtnl_create_link(net, ifname, ops, tb); 1119 1120 if (IS_ERR(dev)) 1121 err = PTR_ERR(dev); 1122 else if (ops->newlink) 1123 err = ops->newlink(dev, tb, data); 1124 else 1125 err = register_netdevice(dev); 1126 1127 if (err < 0 && !IS_ERR(dev)) 1128 free_netdev(dev); 1129 return err; 1130 } 1131 } 1132 1133 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1134 { 1135 struct net *net = skb->sk->sk_net; 1136 struct ifinfomsg *ifm; 1137 struct nlattr *tb[IFLA_MAX+1]; 1138 struct net_device *dev = NULL; 1139 struct sk_buff *nskb; 1140 int err; 1141 1142 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1143 if (err < 0) 1144 return err; 1145 1146 ifm = nlmsg_data(nlh); 1147 if (ifm->ifi_index > 0) { 1148 dev = dev_get_by_index(net, ifm->ifi_index); 1149 if (dev == NULL) 1150 return -ENODEV; 1151 } else 1152 return -EINVAL; 1153 1154 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1155 if (nskb == NULL) { 1156 err = -ENOBUFS; 1157 goto errout; 1158 } 1159 1160 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1161 nlh->nlmsg_seq, 0, 0); 1162 if (err < 0) { 1163 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1164 WARN_ON(err == -EMSGSIZE); 1165 kfree_skb(nskb); 1166 goto errout; 1167 } 1168 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1169 errout: 1170 dev_put(dev); 1171 1172 return err; 1173 } 1174 1175 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1176 { 1177 int idx; 1178 int s_idx = cb->family; 1179 1180 if (s_idx == 0) 1181 s_idx = 1; 1182 for (idx=1; idx<NPROTO; idx++) { 1183 int type = cb->nlh->nlmsg_type-RTM_BASE; 1184 if (idx < s_idx || idx == PF_PACKET) 1185 continue; 1186 if (rtnl_msg_handlers[idx] == NULL || 1187 rtnl_msg_handlers[idx][type].dumpit == NULL) 1188 continue; 1189 if (idx > s_idx) 1190 memset(&cb->args[0], 0, sizeof(cb->args)); 1191 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1192 break; 1193 } 1194 cb->family = idx; 1195 1196 return skb->len; 1197 } 1198 1199 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1200 { 1201 struct net *net = dev->nd_net; 1202 struct sk_buff *skb; 1203 int err = -ENOBUFS; 1204 1205 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1206 if (skb == NULL) 1207 goto errout; 1208 1209 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1210 if (err < 0) { 1211 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1212 WARN_ON(err == -EMSGSIZE); 1213 kfree_skb(skb); 1214 goto errout; 1215 } 1216 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1217 errout: 1218 if (err < 0) 1219 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1220 } 1221 1222 /* Protected by RTNL sempahore. */ 1223 static struct rtattr **rta_buf; 1224 static int rtattr_max; 1225 1226 /* Process one rtnetlink message. */ 1227 1228 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1229 { 1230 struct net *net = skb->sk->sk_net; 1231 rtnl_doit_func doit; 1232 int sz_idx, kind; 1233 int min_len; 1234 int family; 1235 int type; 1236 int err; 1237 1238 type = nlh->nlmsg_type; 1239 if (type > RTM_MAX) 1240 return -EOPNOTSUPP; 1241 1242 type -= RTM_BASE; 1243 1244 /* All the messages must have at least 1 byte length */ 1245 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1246 return 0; 1247 1248 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; 1249 if (family >= NPROTO) 1250 return -EAFNOSUPPORT; 1251 1252 sz_idx = type>>2; 1253 kind = type&3; 1254 1255 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1256 return -EPERM; 1257 1258 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1259 struct sock *rtnl; 1260 rtnl_dumpit_func dumpit; 1261 1262 dumpit = rtnl_get_dumpit(family, type); 1263 if (dumpit == NULL) 1264 return -EOPNOTSUPP; 1265 1266 __rtnl_unlock(); 1267 rtnl = net->rtnl; 1268 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1269 rtnl_lock(); 1270 return err; 1271 } 1272 1273 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1274 1275 min_len = rtm_min[sz_idx]; 1276 if (nlh->nlmsg_len < min_len) 1277 return -EINVAL; 1278 1279 if (nlh->nlmsg_len > min_len) { 1280 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1281 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); 1282 1283 while (RTA_OK(attr, attrlen)) { 1284 unsigned flavor = attr->rta_type; 1285 if (flavor) { 1286 if (flavor > rta_max[sz_idx]) 1287 return -EINVAL; 1288 rta_buf[flavor-1] = attr; 1289 } 1290 attr = RTA_NEXT(attr, attrlen); 1291 } 1292 } 1293 1294 doit = rtnl_get_doit(family, type); 1295 if (doit == NULL) 1296 return -EOPNOTSUPP; 1297 1298 return doit(skb, nlh, (void *)&rta_buf[0]); 1299 } 1300 1301 static void rtnetlink_rcv(struct sk_buff *skb) 1302 { 1303 rtnl_lock(); 1304 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1305 rtnl_unlock(); 1306 } 1307 1308 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1309 { 1310 struct net_device *dev = ptr; 1311 1312 switch (event) { 1313 case NETDEV_UNREGISTER: 1314 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 1315 break; 1316 case NETDEV_REGISTER: 1317 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1318 break; 1319 case NETDEV_UP: 1320 case NETDEV_DOWN: 1321 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 1322 break; 1323 case NETDEV_CHANGE: 1324 case NETDEV_GOING_DOWN: 1325 break; 1326 default: 1327 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1328 break; 1329 } 1330 return NOTIFY_DONE; 1331 } 1332 1333 static struct notifier_block rtnetlink_dev_notifier = { 1334 .notifier_call = rtnetlink_event, 1335 }; 1336 1337 1338 static int rtnetlink_net_init(struct net *net) 1339 { 1340 struct sock *sk; 1341 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1342 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1343 if (!sk) 1344 return -ENOMEM; 1345 net->rtnl = sk; 1346 return 0; 1347 } 1348 1349 static void rtnetlink_net_exit(struct net *net) 1350 { 1351 netlink_kernel_release(net->rtnl); 1352 net->rtnl = NULL; 1353 } 1354 1355 static struct pernet_operations rtnetlink_net_ops = { 1356 .init = rtnetlink_net_init, 1357 .exit = rtnetlink_net_exit, 1358 }; 1359 1360 void __init rtnetlink_init(void) 1361 { 1362 int i; 1363 1364 rtattr_max = 0; 1365 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1366 if (rta_max[i] > rtattr_max) 1367 rtattr_max = rta_max[i]; 1368 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1369 if (!rta_buf) 1370 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1371 1372 if (register_pernet_subsys(&rtnetlink_net_ops)) 1373 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1374 1375 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1376 register_netdevice_notifier(&rtnetlink_dev_notifier); 1377 1378 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1379 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1380 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1381 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1382 1383 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1384 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1385 } 1386 1387 EXPORT_SYMBOL(__rta_fill); 1388 EXPORT_SYMBOL(rtnetlink_put_metrics); 1389 EXPORT_SYMBOL(rtnl_lock); 1390 EXPORT_SYMBOL(rtnl_trylock); 1391 EXPORT_SYMBOL(rtnl_unlock); 1392 EXPORT_SYMBOL(rtnl_unicast); 1393 EXPORT_SYMBOL(rtnl_notify); 1394 EXPORT_SYMBOL(rtnl_set_sk_err); 1395 EXPORT_SYMBOL(rtnl_create_link); 1396 EXPORT_SYMBOL(ifla_policy); 1397