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 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 273 { 274 struct net_device *dev; 275 restart: 276 for_each_netdev(net, dev) { 277 if (dev->rtnl_link_ops == ops) { 278 ops->dellink(dev); 279 goto restart; 280 } 281 } 282 } 283 284 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 285 { 286 rtnl_lock(); 287 __rtnl_kill_links(net, ops); 288 rtnl_unlock(); 289 } 290 EXPORT_SYMBOL_GPL(rtnl_kill_links); 291 292 /** 293 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 294 * @ops: struct rtnl_link_ops * to unregister 295 * 296 * The caller must hold the rtnl_mutex. 297 */ 298 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 299 { 300 struct net *net; 301 302 for_each_net(net) { 303 __rtnl_kill_links(net, ops); 304 } 305 list_del(&ops->list); 306 } 307 308 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 309 310 /** 311 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 312 * @ops: struct rtnl_link_ops * to unregister 313 */ 314 void rtnl_link_unregister(struct rtnl_link_ops *ops) 315 { 316 rtnl_lock(); 317 __rtnl_link_unregister(ops); 318 rtnl_unlock(); 319 } 320 321 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 322 323 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 324 { 325 const struct rtnl_link_ops *ops; 326 327 list_for_each_entry(ops, &link_ops, list) { 328 if (!strcmp(ops->kind, kind)) 329 return ops; 330 } 331 return NULL; 332 } 333 334 static size_t rtnl_link_get_size(const struct net_device *dev) 335 { 336 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 337 size_t size; 338 339 if (!ops) 340 return 0; 341 342 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 343 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 344 345 if (ops->get_size) 346 /* IFLA_INFO_DATA + nested data */ 347 size += nlmsg_total_size(sizeof(struct nlattr)) + 348 ops->get_size(dev); 349 350 if (ops->get_xstats_size) 351 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ 352 353 return size; 354 } 355 356 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 357 { 358 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 359 struct nlattr *linkinfo, *data; 360 int err = -EMSGSIZE; 361 362 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 363 if (linkinfo == NULL) 364 goto out; 365 366 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 367 goto err_cancel_link; 368 if (ops->fill_xstats) { 369 err = ops->fill_xstats(skb, dev); 370 if (err < 0) 371 goto err_cancel_link; 372 } 373 if (ops->fill_info) { 374 data = nla_nest_start(skb, IFLA_INFO_DATA); 375 if (data == NULL) 376 goto err_cancel_link; 377 err = ops->fill_info(skb, dev); 378 if (err < 0) 379 goto err_cancel_data; 380 nla_nest_end(skb, data); 381 } 382 383 nla_nest_end(skb, linkinfo); 384 return 0; 385 386 err_cancel_data: 387 nla_nest_cancel(skb, data); 388 err_cancel_link: 389 nla_nest_cancel(skb, linkinfo); 390 out: 391 return err; 392 } 393 394 static const int rtm_min[RTM_NR_FAMILIES] = 395 { 396 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 397 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 398 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 399 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 400 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 401 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 402 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 403 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 404 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 405 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 406 }; 407 408 static const int rta_max[RTM_NR_FAMILIES] = 409 { 410 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 411 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 412 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 413 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 414 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 415 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 416 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 417 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 418 }; 419 420 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 421 { 422 struct rtattr *rta; 423 int size = RTA_LENGTH(attrlen); 424 425 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); 426 rta->rta_type = attrtype; 427 rta->rta_len = size; 428 memcpy(RTA_DATA(rta), data, attrlen); 429 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 430 } 431 432 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 433 { 434 struct sock *rtnl = net->rtnl; 435 int err = 0; 436 437 NETLINK_CB(skb).dst_group = group; 438 if (echo) 439 atomic_inc(&skb->users); 440 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 441 if (echo) 442 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 443 return err; 444 } 445 446 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 447 { 448 struct sock *rtnl = net->rtnl; 449 450 return nlmsg_unicast(rtnl, skb, pid); 451 } 452 453 int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 454 struct nlmsghdr *nlh, gfp_t flags) 455 { 456 struct sock *rtnl = net->rtnl; 457 int report = 0; 458 459 if (nlh) 460 report = nlmsg_report(nlh); 461 462 return nlmsg_notify(rtnl, skb, pid, group, report, flags); 463 } 464 465 void rtnl_set_sk_err(struct net *net, u32 group, int error) 466 { 467 struct sock *rtnl = net->rtnl; 468 469 netlink_set_err(rtnl, 0, group, error); 470 } 471 472 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 473 { 474 struct nlattr *mx; 475 int i, valid = 0; 476 477 mx = nla_nest_start(skb, RTA_METRICS); 478 if (mx == NULL) 479 return -ENOBUFS; 480 481 for (i = 0; i < RTAX_MAX; i++) { 482 if (metrics[i]) { 483 valid++; 484 NLA_PUT_U32(skb, i+1, metrics[i]); 485 } 486 } 487 488 if (!valid) { 489 nla_nest_cancel(skb, mx); 490 return 0; 491 } 492 493 return nla_nest_end(skb, mx); 494 495 nla_put_failure: 496 return nla_nest_cancel(skb, mx); 497 } 498 499 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 500 u32 ts, u32 tsage, long expires, u32 error) 501 { 502 struct rta_cacheinfo ci = { 503 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 504 .rta_used = dst->__use, 505 .rta_clntref = atomic_read(&(dst->__refcnt)), 506 .rta_error = error, 507 .rta_id = id, 508 .rta_ts = ts, 509 .rta_tsage = tsage, 510 }; 511 512 if (expires) 513 ci.rta_expires = jiffies_to_clock_t(expires); 514 515 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 516 } 517 518 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 519 520 static void set_operstate(struct net_device *dev, unsigned char transition) 521 { 522 unsigned char operstate = dev->operstate; 523 524 switch(transition) { 525 case IF_OPER_UP: 526 if ((operstate == IF_OPER_DORMANT || 527 operstate == IF_OPER_UNKNOWN) && 528 !netif_dormant(dev)) 529 operstate = IF_OPER_UP; 530 break; 531 532 case IF_OPER_DORMANT: 533 if (operstate == IF_OPER_UP || 534 operstate == IF_OPER_UNKNOWN) 535 operstate = IF_OPER_DORMANT; 536 break; 537 } 538 539 if (dev->operstate != operstate) { 540 write_lock_bh(&dev_base_lock); 541 dev->operstate = operstate; 542 write_unlock_bh(&dev_base_lock); 543 netdev_state_change(dev); 544 } 545 } 546 547 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 548 struct net_device_stats *b) 549 { 550 a->rx_packets = b->rx_packets; 551 a->tx_packets = b->tx_packets; 552 a->rx_bytes = b->rx_bytes; 553 a->tx_bytes = b->tx_bytes; 554 a->rx_errors = b->rx_errors; 555 a->tx_errors = b->tx_errors; 556 a->rx_dropped = b->rx_dropped; 557 a->tx_dropped = b->tx_dropped; 558 559 a->multicast = b->multicast; 560 a->collisions = b->collisions; 561 562 a->rx_length_errors = b->rx_length_errors; 563 a->rx_over_errors = b->rx_over_errors; 564 a->rx_crc_errors = b->rx_crc_errors; 565 a->rx_frame_errors = b->rx_frame_errors; 566 a->rx_fifo_errors = b->rx_fifo_errors; 567 a->rx_missed_errors = b->rx_missed_errors; 568 569 a->tx_aborted_errors = b->tx_aborted_errors; 570 a->tx_carrier_errors = b->tx_carrier_errors; 571 a->tx_fifo_errors = b->tx_fifo_errors; 572 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 573 a->tx_window_errors = b->tx_window_errors; 574 575 a->rx_compressed = b->rx_compressed; 576 a->tx_compressed = b->tx_compressed; 577 }; 578 579 static inline size_t if_nlmsg_size(const struct net_device *dev) 580 { 581 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 582 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 583 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 584 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 585 + nla_total_size(sizeof(struct rtnl_link_stats)) 586 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 587 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 588 + nla_total_size(4) /* IFLA_TXQLEN */ 589 + nla_total_size(4) /* IFLA_WEIGHT */ 590 + nla_total_size(4) /* IFLA_MTU */ 591 + nla_total_size(4) /* IFLA_LINK */ 592 + nla_total_size(4) /* IFLA_MASTER */ 593 + nla_total_size(1) /* IFLA_OPERSTATE */ 594 + nla_total_size(1) /* IFLA_LINKMODE */ 595 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 596 } 597 598 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 599 int type, u32 pid, u32 seq, u32 change, 600 unsigned int flags) 601 { 602 struct ifinfomsg *ifm; 603 struct nlmsghdr *nlh; 604 605 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 606 if (nlh == NULL) 607 return -EMSGSIZE; 608 609 ifm = nlmsg_data(nlh); 610 ifm->ifi_family = AF_UNSPEC; 611 ifm->__ifi_pad = 0; 612 ifm->ifi_type = dev->type; 613 ifm->ifi_index = dev->ifindex; 614 ifm->ifi_flags = dev_get_flags(dev); 615 ifm->ifi_change = change; 616 617 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 618 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 619 NLA_PUT_U8(skb, IFLA_OPERSTATE, 620 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 621 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 622 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 623 624 if (dev->ifindex != dev->iflink) 625 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 626 627 if (dev->master) 628 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 629 630 if (dev->qdisc_sleeping) 631 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); 632 633 if (1) { 634 struct rtnl_link_ifmap map = { 635 .mem_start = dev->mem_start, 636 .mem_end = dev->mem_end, 637 .base_addr = dev->base_addr, 638 .irq = dev->irq, 639 .dma = dev->dma, 640 .port = dev->if_port, 641 }; 642 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 643 } 644 645 if (dev->addr_len) { 646 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 647 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 648 } 649 650 if (dev->get_stats) { 651 struct net_device_stats *stats = dev->get_stats(dev); 652 if (stats) { 653 struct nlattr *attr; 654 655 attr = nla_reserve(skb, IFLA_STATS, 656 sizeof(struct rtnl_link_stats)); 657 if (attr == NULL) 658 goto nla_put_failure; 659 660 copy_rtnl_link_stats(nla_data(attr), stats); 661 } 662 } 663 664 if (dev->rtnl_link_ops) { 665 if (rtnl_link_fill(skb, dev) < 0) 666 goto nla_put_failure; 667 } 668 669 return nlmsg_end(skb, nlh); 670 671 nla_put_failure: 672 nlmsg_cancel(skb, nlh); 673 return -EMSGSIZE; 674 } 675 676 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 677 { 678 struct net *net = sock_net(skb->sk); 679 int idx; 680 int s_idx = cb->args[0]; 681 struct net_device *dev; 682 683 idx = 0; 684 for_each_netdev(net, dev) { 685 if (idx < s_idx) 686 goto cont; 687 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 688 NETLINK_CB(cb->skb).pid, 689 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) 690 break; 691 cont: 692 idx++; 693 } 694 cb->args[0] = idx; 695 696 return skb->len; 697 } 698 699 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 700 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 701 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 702 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 703 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 704 [IFLA_MTU] = { .type = NLA_U32 }, 705 [IFLA_LINK] = { .type = NLA_U32 }, 706 [IFLA_TXQLEN] = { .type = NLA_U32 }, 707 [IFLA_WEIGHT] = { .type = NLA_U32 }, 708 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 709 [IFLA_LINKMODE] = { .type = NLA_U8 }, 710 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 711 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 712 }; 713 714 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 715 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 716 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 717 }; 718 719 static struct net *get_net_ns_by_pid(pid_t pid) 720 { 721 struct task_struct *tsk; 722 struct net *net; 723 724 /* Lookup the network namespace */ 725 net = ERR_PTR(-ESRCH); 726 rcu_read_lock(); 727 tsk = find_task_by_vpid(pid); 728 if (tsk) { 729 struct nsproxy *nsproxy; 730 nsproxy = task_nsproxy(tsk); 731 if (nsproxy) 732 net = get_net(nsproxy->net_ns); 733 } 734 rcu_read_unlock(); 735 return net; 736 } 737 738 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 739 { 740 if (dev) { 741 if (tb[IFLA_ADDRESS] && 742 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 743 return -EINVAL; 744 745 if (tb[IFLA_BROADCAST] && 746 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 747 return -EINVAL; 748 } 749 750 return 0; 751 } 752 753 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 754 struct nlattr **tb, char *ifname, int modified) 755 { 756 int send_addr_notify = 0; 757 int err; 758 759 if (tb[IFLA_NET_NS_PID]) { 760 struct net *net; 761 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 762 if (IS_ERR(net)) { 763 err = PTR_ERR(net); 764 goto errout; 765 } 766 err = dev_change_net_namespace(dev, net, ifname); 767 put_net(net); 768 if (err) 769 goto errout; 770 modified = 1; 771 } 772 773 if (tb[IFLA_MAP]) { 774 struct rtnl_link_ifmap *u_map; 775 struct ifmap k_map; 776 777 if (!dev->set_config) { 778 err = -EOPNOTSUPP; 779 goto errout; 780 } 781 782 if (!netif_device_present(dev)) { 783 err = -ENODEV; 784 goto errout; 785 } 786 787 u_map = nla_data(tb[IFLA_MAP]); 788 k_map.mem_start = (unsigned long) u_map->mem_start; 789 k_map.mem_end = (unsigned long) u_map->mem_end; 790 k_map.base_addr = (unsigned short) u_map->base_addr; 791 k_map.irq = (unsigned char) u_map->irq; 792 k_map.dma = (unsigned char) u_map->dma; 793 k_map.port = (unsigned char) u_map->port; 794 795 err = dev->set_config(dev, &k_map); 796 if (err < 0) 797 goto errout; 798 799 modified = 1; 800 } 801 802 if (tb[IFLA_ADDRESS]) { 803 struct sockaddr *sa; 804 int len; 805 806 if (!dev->set_mac_address) { 807 err = -EOPNOTSUPP; 808 goto errout; 809 } 810 811 if (!netif_device_present(dev)) { 812 err = -ENODEV; 813 goto errout; 814 } 815 816 len = sizeof(sa_family_t) + dev->addr_len; 817 sa = kmalloc(len, GFP_KERNEL); 818 if (!sa) { 819 err = -ENOMEM; 820 goto errout; 821 } 822 sa->sa_family = dev->type; 823 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 824 dev->addr_len); 825 err = dev->set_mac_address(dev, sa); 826 kfree(sa); 827 if (err) 828 goto errout; 829 send_addr_notify = 1; 830 modified = 1; 831 } 832 833 if (tb[IFLA_MTU]) { 834 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 835 if (err < 0) 836 goto errout; 837 modified = 1; 838 } 839 840 /* 841 * Interface selected by interface index but interface 842 * name provided implies that a name change has been 843 * requested. 844 */ 845 if (ifm->ifi_index > 0 && ifname[0]) { 846 err = dev_change_name(dev, ifname); 847 if (err < 0) 848 goto errout; 849 modified = 1; 850 } 851 852 if (tb[IFLA_BROADCAST]) { 853 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 854 send_addr_notify = 1; 855 } 856 857 if (ifm->ifi_flags || ifm->ifi_change) { 858 unsigned int flags = ifm->ifi_flags; 859 860 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 861 if (ifm->ifi_change) 862 flags = (flags & ifm->ifi_change) | 863 (dev->flags & ~ifm->ifi_change); 864 dev_change_flags(dev, flags); 865 } 866 867 if (tb[IFLA_TXQLEN]) 868 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 869 870 if (tb[IFLA_OPERSTATE]) 871 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 872 873 if (tb[IFLA_LINKMODE]) { 874 write_lock_bh(&dev_base_lock); 875 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 876 write_unlock_bh(&dev_base_lock); 877 } 878 879 err = 0; 880 881 errout: 882 if (err < 0 && modified && net_ratelimit()) 883 printk(KERN_WARNING "A link change request failed with " 884 "some changes comitted already. Interface %s may " 885 "have been left with an inconsistent configuration, " 886 "please check.\n", dev->name); 887 888 if (send_addr_notify) 889 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 890 return err; 891 } 892 893 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 894 { 895 struct net *net = sock_net(skb->sk); 896 struct ifinfomsg *ifm; 897 struct net_device *dev; 898 int err; 899 struct nlattr *tb[IFLA_MAX+1]; 900 char ifname[IFNAMSIZ]; 901 902 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 903 if (err < 0) 904 goto errout; 905 906 if (tb[IFLA_IFNAME]) 907 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 908 else 909 ifname[0] = '\0'; 910 911 err = -EINVAL; 912 ifm = nlmsg_data(nlh); 913 if (ifm->ifi_index > 0) 914 dev = dev_get_by_index(net, ifm->ifi_index); 915 else if (tb[IFLA_IFNAME]) 916 dev = dev_get_by_name(net, ifname); 917 else 918 goto errout; 919 920 if (dev == NULL) { 921 err = -ENODEV; 922 goto errout; 923 } 924 925 if ((err = validate_linkmsg(dev, tb)) < 0) 926 goto errout_dev; 927 928 err = do_setlink(dev, ifm, tb, ifname, 0); 929 errout_dev: 930 dev_put(dev); 931 errout: 932 return err; 933 } 934 935 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 936 { 937 struct net *net = sock_net(skb->sk); 938 const struct rtnl_link_ops *ops; 939 struct net_device *dev; 940 struct ifinfomsg *ifm; 941 char ifname[IFNAMSIZ]; 942 struct nlattr *tb[IFLA_MAX+1]; 943 int err; 944 945 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 946 if (err < 0) 947 return err; 948 949 if (tb[IFLA_IFNAME]) 950 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 951 952 ifm = nlmsg_data(nlh); 953 if (ifm->ifi_index > 0) 954 dev = __dev_get_by_index(net, ifm->ifi_index); 955 else if (tb[IFLA_IFNAME]) 956 dev = __dev_get_by_name(net, ifname); 957 else 958 return -EINVAL; 959 960 if (!dev) 961 return -ENODEV; 962 963 ops = dev->rtnl_link_ops; 964 if (!ops) 965 return -EOPNOTSUPP; 966 967 ops->dellink(dev); 968 return 0; 969 } 970 971 struct net_device *rtnl_create_link(struct net *net, char *ifname, 972 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 973 { 974 int err; 975 struct net_device *dev; 976 977 err = -ENOMEM; 978 dev = alloc_netdev(ops->priv_size, ifname, ops->setup); 979 if (!dev) 980 goto err; 981 982 if (strchr(dev->name, '%')) { 983 err = dev_alloc_name(dev, dev->name); 984 if (err < 0) 985 goto err_free; 986 } 987 988 dev_net_set(dev, net); 989 dev->rtnl_link_ops = ops; 990 991 if (tb[IFLA_MTU]) 992 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 993 if (tb[IFLA_ADDRESS]) 994 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 995 nla_len(tb[IFLA_ADDRESS])); 996 if (tb[IFLA_BROADCAST]) 997 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 998 nla_len(tb[IFLA_BROADCAST])); 999 if (tb[IFLA_TXQLEN]) 1000 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1001 if (tb[IFLA_OPERSTATE]) 1002 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1003 if (tb[IFLA_LINKMODE]) 1004 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1005 1006 return dev; 1007 1008 err_free: 1009 free_netdev(dev); 1010 err: 1011 return ERR_PTR(err); 1012 } 1013 1014 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1015 { 1016 struct net *net = sock_net(skb->sk); 1017 const struct rtnl_link_ops *ops; 1018 struct net_device *dev; 1019 struct ifinfomsg *ifm; 1020 char kind[MODULE_NAME_LEN]; 1021 char ifname[IFNAMSIZ]; 1022 struct nlattr *tb[IFLA_MAX+1]; 1023 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1024 int err; 1025 1026 #ifdef CONFIG_KMOD 1027 replay: 1028 #endif 1029 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1030 if (err < 0) 1031 return err; 1032 1033 if (tb[IFLA_IFNAME]) 1034 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1035 else 1036 ifname[0] = '\0'; 1037 1038 ifm = nlmsg_data(nlh); 1039 if (ifm->ifi_index > 0) 1040 dev = __dev_get_by_index(net, ifm->ifi_index); 1041 else if (ifname[0]) 1042 dev = __dev_get_by_name(net, ifname); 1043 else 1044 dev = NULL; 1045 1046 if ((err = validate_linkmsg(dev, tb)) < 0) 1047 return err; 1048 1049 if (tb[IFLA_LINKINFO]) { 1050 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1051 tb[IFLA_LINKINFO], ifla_info_policy); 1052 if (err < 0) 1053 return err; 1054 } else 1055 memset(linkinfo, 0, sizeof(linkinfo)); 1056 1057 if (linkinfo[IFLA_INFO_KIND]) { 1058 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1059 ops = rtnl_link_ops_get(kind); 1060 } else { 1061 kind[0] = '\0'; 1062 ops = NULL; 1063 } 1064 1065 if (1) { 1066 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1067 1068 if (ops) { 1069 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1070 err = nla_parse_nested(attr, ops->maxtype, 1071 linkinfo[IFLA_INFO_DATA], 1072 ops->policy); 1073 if (err < 0) 1074 return err; 1075 data = attr; 1076 } 1077 if (ops->validate) { 1078 err = ops->validate(tb, data); 1079 if (err < 0) 1080 return err; 1081 } 1082 } 1083 1084 if (dev) { 1085 int modified = 0; 1086 1087 if (nlh->nlmsg_flags & NLM_F_EXCL) 1088 return -EEXIST; 1089 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1090 return -EOPNOTSUPP; 1091 1092 if (linkinfo[IFLA_INFO_DATA]) { 1093 if (!ops || ops != dev->rtnl_link_ops || 1094 !ops->changelink) 1095 return -EOPNOTSUPP; 1096 1097 err = ops->changelink(dev, tb, data); 1098 if (err < 0) 1099 return err; 1100 modified = 1; 1101 } 1102 1103 return do_setlink(dev, ifm, tb, ifname, modified); 1104 } 1105 1106 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1107 return -ENODEV; 1108 1109 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) 1110 return -EOPNOTSUPP; 1111 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1112 return -EOPNOTSUPP; 1113 1114 if (!ops) { 1115 #ifdef CONFIG_KMOD 1116 if (kind[0]) { 1117 __rtnl_unlock(); 1118 request_module("rtnl-link-%s", kind); 1119 rtnl_lock(); 1120 ops = rtnl_link_ops_get(kind); 1121 if (ops) 1122 goto replay; 1123 } 1124 #endif 1125 return -EOPNOTSUPP; 1126 } 1127 1128 if (!ifname[0]) 1129 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1130 1131 dev = rtnl_create_link(net, ifname, ops, tb); 1132 1133 if (IS_ERR(dev)) 1134 err = PTR_ERR(dev); 1135 else if (ops->newlink) 1136 err = ops->newlink(dev, tb, data); 1137 else 1138 err = register_netdevice(dev); 1139 1140 if (err < 0 && !IS_ERR(dev)) 1141 free_netdev(dev); 1142 return err; 1143 } 1144 } 1145 1146 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1147 { 1148 struct net *net = sock_net(skb->sk); 1149 struct ifinfomsg *ifm; 1150 struct nlattr *tb[IFLA_MAX+1]; 1151 struct net_device *dev = NULL; 1152 struct sk_buff *nskb; 1153 int err; 1154 1155 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1156 if (err < 0) 1157 return err; 1158 1159 ifm = nlmsg_data(nlh); 1160 if (ifm->ifi_index > 0) { 1161 dev = dev_get_by_index(net, ifm->ifi_index); 1162 if (dev == NULL) 1163 return -ENODEV; 1164 } else 1165 return -EINVAL; 1166 1167 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1168 if (nskb == NULL) { 1169 err = -ENOBUFS; 1170 goto errout; 1171 } 1172 1173 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1174 nlh->nlmsg_seq, 0, 0); 1175 if (err < 0) { 1176 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1177 WARN_ON(err == -EMSGSIZE); 1178 kfree_skb(nskb); 1179 goto errout; 1180 } 1181 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1182 errout: 1183 dev_put(dev); 1184 1185 return err; 1186 } 1187 1188 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1189 { 1190 int idx; 1191 int s_idx = cb->family; 1192 1193 if (s_idx == 0) 1194 s_idx = 1; 1195 for (idx=1; idx<NPROTO; idx++) { 1196 int type = cb->nlh->nlmsg_type-RTM_BASE; 1197 if (idx < s_idx || idx == PF_PACKET) 1198 continue; 1199 if (rtnl_msg_handlers[idx] == NULL || 1200 rtnl_msg_handlers[idx][type].dumpit == NULL) 1201 continue; 1202 if (idx > s_idx) 1203 memset(&cb->args[0], 0, sizeof(cb->args)); 1204 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1205 break; 1206 } 1207 cb->family = idx; 1208 1209 return skb->len; 1210 } 1211 1212 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1213 { 1214 struct net *net = dev_net(dev); 1215 struct sk_buff *skb; 1216 int err = -ENOBUFS; 1217 1218 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1219 if (skb == NULL) 1220 goto errout; 1221 1222 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1223 if (err < 0) { 1224 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1225 WARN_ON(err == -EMSGSIZE); 1226 kfree_skb(skb); 1227 goto errout; 1228 } 1229 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1230 errout: 1231 if (err < 0) 1232 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1233 } 1234 1235 /* Protected by RTNL sempahore. */ 1236 static struct rtattr **rta_buf; 1237 static int rtattr_max; 1238 1239 /* Process one rtnetlink message. */ 1240 1241 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1242 { 1243 struct net *net = sock_net(skb->sk); 1244 rtnl_doit_func doit; 1245 int sz_idx, kind; 1246 int min_len; 1247 int family; 1248 int type; 1249 int err; 1250 1251 type = nlh->nlmsg_type; 1252 if (type > RTM_MAX) 1253 return -EOPNOTSUPP; 1254 1255 type -= RTM_BASE; 1256 1257 /* All the messages must have at least 1 byte length */ 1258 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1259 return 0; 1260 1261 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; 1262 if (family >= NPROTO) 1263 return -EAFNOSUPPORT; 1264 1265 sz_idx = type>>2; 1266 kind = type&3; 1267 1268 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1269 return -EPERM; 1270 1271 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1272 struct sock *rtnl; 1273 rtnl_dumpit_func dumpit; 1274 1275 dumpit = rtnl_get_dumpit(family, type); 1276 if (dumpit == NULL) 1277 return -EOPNOTSUPP; 1278 1279 __rtnl_unlock(); 1280 rtnl = net->rtnl; 1281 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1282 rtnl_lock(); 1283 return err; 1284 } 1285 1286 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1287 1288 min_len = rtm_min[sz_idx]; 1289 if (nlh->nlmsg_len < min_len) 1290 return -EINVAL; 1291 1292 if (nlh->nlmsg_len > min_len) { 1293 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1294 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); 1295 1296 while (RTA_OK(attr, attrlen)) { 1297 unsigned flavor = attr->rta_type; 1298 if (flavor) { 1299 if (flavor > rta_max[sz_idx]) 1300 return -EINVAL; 1301 rta_buf[flavor-1] = attr; 1302 } 1303 attr = RTA_NEXT(attr, attrlen); 1304 } 1305 } 1306 1307 doit = rtnl_get_doit(family, type); 1308 if (doit == NULL) 1309 return -EOPNOTSUPP; 1310 1311 return doit(skb, nlh, (void *)&rta_buf[0]); 1312 } 1313 1314 static void rtnetlink_rcv(struct sk_buff *skb) 1315 { 1316 rtnl_lock(); 1317 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1318 rtnl_unlock(); 1319 } 1320 1321 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1322 { 1323 struct net_device *dev = ptr; 1324 1325 switch (event) { 1326 case NETDEV_UNREGISTER: 1327 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 1328 break; 1329 case NETDEV_REGISTER: 1330 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1331 break; 1332 case NETDEV_UP: 1333 case NETDEV_DOWN: 1334 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 1335 break; 1336 case NETDEV_CHANGE: 1337 case NETDEV_GOING_DOWN: 1338 break; 1339 default: 1340 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1341 break; 1342 } 1343 return NOTIFY_DONE; 1344 } 1345 1346 static struct notifier_block rtnetlink_dev_notifier = { 1347 .notifier_call = rtnetlink_event, 1348 }; 1349 1350 1351 static int rtnetlink_net_init(struct net *net) 1352 { 1353 struct sock *sk; 1354 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1355 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1356 if (!sk) 1357 return -ENOMEM; 1358 net->rtnl = sk; 1359 return 0; 1360 } 1361 1362 static void rtnetlink_net_exit(struct net *net) 1363 { 1364 netlink_kernel_release(net->rtnl); 1365 net->rtnl = NULL; 1366 } 1367 1368 static struct pernet_operations rtnetlink_net_ops = { 1369 .init = rtnetlink_net_init, 1370 .exit = rtnetlink_net_exit, 1371 }; 1372 1373 void __init rtnetlink_init(void) 1374 { 1375 int i; 1376 1377 rtattr_max = 0; 1378 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1379 if (rta_max[i] > rtattr_max) 1380 rtattr_max = rta_max[i]; 1381 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1382 if (!rta_buf) 1383 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1384 1385 if (register_pernet_subsys(&rtnetlink_net_ops)) 1386 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1387 1388 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1389 register_netdevice_notifier(&rtnetlink_dev_notifier); 1390 1391 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1392 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1393 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1394 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1395 1396 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1397 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1398 } 1399 1400 EXPORT_SYMBOL(__rta_fill); 1401 EXPORT_SYMBOL(rtnetlink_put_metrics); 1402 EXPORT_SYMBOL(rtnl_lock); 1403 EXPORT_SYMBOL(rtnl_trylock); 1404 EXPORT_SYMBOL(rtnl_unlock); 1405 EXPORT_SYMBOL(rtnl_unicast); 1406 EXPORT_SYMBOL(rtnl_notify); 1407 EXPORT_SYMBOL(rtnl_set_sk_err); 1408 EXPORT_SYMBOL(rtnl_create_link); 1409 EXPORT_SYMBOL(ifla_policy); 1410