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