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