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 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len) 86 { 87 memset(tb, 0, sizeof(struct rtattr*)*maxattr); 88 89 while (RTA_OK(rta, len)) { 90 unsigned flavor = rta->rta_type; 91 if (flavor && flavor <= maxattr) 92 tb[flavor-1] = rta; 93 rta = RTA_NEXT(rta, len); 94 } 95 return 0; 96 } 97 98 int __rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr, 99 struct rtattr *rta, int len) 100 { 101 if (RTA_PAYLOAD(rta) < len) 102 return -1; 103 if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) { 104 rta = RTA_DATA(rta) + RTA_ALIGN(len); 105 return rtattr_parse_nested(tb, maxattr, rta); 106 } 107 memset(tb, 0, sizeof(struct rtattr *) * maxattr); 108 return 0; 109 } 110 111 static struct rtnl_link *rtnl_msg_handlers[NPROTO]; 112 113 static inline int rtm_msgindex(int msgtype) 114 { 115 int msgindex = msgtype - RTM_BASE; 116 117 /* 118 * msgindex < 0 implies someone tried to register a netlink 119 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 120 * the message type has not been added to linux/rtnetlink.h 121 */ 122 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 123 124 return msgindex; 125 } 126 127 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 128 { 129 struct rtnl_link *tab; 130 131 tab = rtnl_msg_handlers[protocol]; 132 if (tab == NULL || tab[msgindex].doit == NULL) 133 tab = rtnl_msg_handlers[PF_UNSPEC]; 134 135 return tab ? tab[msgindex].doit : NULL; 136 } 137 138 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 139 { 140 struct rtnl_link *tab; 141 142 tab = rtnl_msg_handlers[protocol]; 143 if (tab == NULL || tab[msgindex].dumpit == NULL) 144 tab = rtnl_msg_handlers[PF_UNSPEC]; 145 146 return tab ? tab[msgindex].dumpit : NULL; 147 } 148 149 /** 150 * __rtnl_register - Register a rtnetlink message type 151 * @protocol: Protocol family or PF_UNSPEC 152 * @msgtype: rtnetlink message type 153 * @doit: Function pointer called for each request message 154 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 155 * 156 * Registers the specified function pointers (at least one of them has 157 * to be non-NULL) to be called whenever a request message for the 158 * specified protocol family and message type is received. 159 * 160 * The special protocol family PF_UNSPEC may be used to define fallback 161 * function pointers for the case when no entry for the specific protocol 162 * family exists. 163 * 164 * Returns 0 on success or a negative error code. 165 */ 166 int __rtnl_register(int protocol, int msgtype, 167 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 168 { 169 struct rtnl_link *tab; 170 int msgindex; 171 172 BUG_ON(protocol < 0 || protocol >= NPROTO); 173 msgindex = rtm_msgindex(msgtype); 174 175 tab = rtnl_msg_handlers[protocol]; 176 if (tab == NULL) { 177 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 178 if (tab == NULL) 179 return -ENOBUFS; 180 181 rtnl_msg_handlers[protocol] = tab; 182 } 183 184 if (doit) 185 tab[msgindex].doit = doit; 186 187 if (dumpit) 188 tab[msgindex].dumpit = dumpit; 189 190 return 0; 191 } 192 193 EXPORT_SYMBOL_GPL(__rtnl_register); 194 195 /** 196 * rtnl_register - Register a rtnetlink message type 197 * 198 * Identical to __rtnl_register() but panics on failure. This is useful 199 * as failure of this function is very unlikely, it can only happen due 200 * to lack of memory when allocating the chain to store all message 201 * handlers for a protocol. Meant for use in init functions where lack 202 * of memory implies no sense in continueing. 203 */ 204 void rtnl_register(int protocol, int msgtype, 205 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 206 { 207 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 208 panic("Unable to register rtnetlink message handler, " 209 "protocol = %d, message type = %d\n", 210 protocol, msgtype); 211 } 212 213 EXPORT_SYMBOL_GPL(rtnl_register); 214 215 /** 216 * rtnl_unregister - Unregister a rtnetlink message type 217 * @protocol: Protocol family or PF_UNSPEC 218 * @msgtype: rtnetlink message type 219 * 220 * Returns 0 on success or a negative error code. 221 */ 222 int rtnl_unregister(int protocol, int msgtype) 223 { 224 int msgindex; 225 226 BUG_ON(protocol < 0 || protocol >= NPROTO); 227 msgindex = rtm_msgindex(msgtype); 228 229 if (rtnl_msg_handlers[protocol] == NULL) 230 return -ENOENT; 231 232 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 233 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 234 235 return 0; 236 } 237 238 EXPORT_SYMBOL_GPL(rtnl_unregister); 239 240 /** 241 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 242 * @protocol : Protocol family or PF_UNSPEC 243 * 244 * Identical to calling rtnl_unregster() for all registered message types 245 * of a certain protocol family. 246 */ 247 void rtnl_unregister_all(int protocol) 248 { 249 BUG_ON(protocol < 0 || protocol >= NPROTO); 250 251 kfree(rtnl_msg_handlers[protocol]); 252 rtnl_msg_handlers[protocol] = NULL; 253 } 254 255 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 256 257 static LIST_HEAD(link_ops); 258 259 /** 260 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 261 * @ops: struct rtnl_link_ops * to register 262 * 263 * The caller must hold the rtnl_mutex. This function should be used 264 * by drivers that create devices during module initialization. It 265 * must be called before registering the devices. 266 * 267 * Returns 0 on success or a negative error code. 268 */ 269 int __rtnl_link_register(struct rtnl_link_ops *ops) 270 { 271 if (!ops->dellink) 272 ops->dellink = unregister_netdevice; 273 274 list_add_tail(&ops->list, &link_ops); 275 return 0; 276 } 277 278 EXPORT_SYMBOL_GPL(__rtnl_link_register); 279 280 /** 281 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 282 * @ops: struct rtnl_link_ops * to register 283 * 284 * Returns 0 on success or a negative error code. 285 */ 286 int rtnl_link_register(struct rtnl_link_ops *ops) 287 { 288 int err; 289 290 rtnl_lock(); 291 err = __rtnl_link_register(ops); 292 rtnl_unlock(); 293 return err; 294 } 295 296 EXPORT_SYMBOL_GPL(rtnl_link_register); 297 298 /** 299 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 300 * @ops: struct rtnl_link_ops * to unregister 301 * 302 * The caller must hold the rtnl_mutex. 303 */ 304 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 305 { 306 struct net_device *dev, *n; 307 struct net *net; 308 309 for_each_net(net) { 310 restart: 311 for_each_netdev_safe(net, dev, n) { 312 if (dev->rtnl_link_ops == ops) { 313 ops->dellink(dev); 314 goto restart; 315 } 316 } 317 } 318 list_del(&ops->list); 319 } 320 321 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 322 323 /** 324 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 325 * @ops: struct rtnl_link_ops * to unregister 326 */ 327 void rtnl_link_unregister(struct rtnl_link_ops *ops) 328 { 329 rtnl_lock(); 330 __rtnl_link_unregister(ops); 331 rtnl_unlock(); 332 } 333 334 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 335 336 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 337 { 338 const struct rtnl_link_ops *ops; 339 340 list_for_each_entry(ops, &link_ops, list) { 341 if (!strcmp(ops->kind, kind)) 342 return ops; 343 } 344 return NULL; 345 } 346 347 static size_t rtnl_link_get_size(const struct net_device *dev) 348 { 349 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 350 size_t size; 351 352 if (!ops) 353 return 0; 354 355 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 356 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 357 358 if (ops->get_size) 359 /* IFLA_INFO_DATA + nested data */ 360 size += nlmsg_total_size(sizeof(struct nlattr)) + 361 ops->get_size(dev); 362 363 if (ops->get_xstats_size) 364 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ 365 366 return size; 367 } 368 369 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 370 { 371 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 372 struct nlattr *linkinfo, *data; 373 int err = -EMSGSIZE; 374 375 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 376 if (linkinfo == NULL) 377 goto out; 378 379 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 380 goto err_cancel_link; 381 if (ops->fill_xstats) { 382 err = ops->fill_xstats(skb, dev); 383 if (err < 0) 384 goto err_cancel_link; 385 } 386 if (ops->fill_info) { 387 data = nla_nest_start(skb, IFLA_INFO_DATA); 388 if (data == NULL) 389 goto err_cancel_link; 390 err = ops->fill_info(skb, dev); 391 if (err < 0) 392 goto err_cancel_data; 393 nla_nest_end(skb, data); 394 } 395 396 nla_nest_end(skb, linkinfo); 397 return 0; 398 399 err_cancel_data: 400 nla_nest_cancel(skb, data); 401 err_cancel_link: 402 nla_nest_cancel(skb, linkinfo); 403 out: 404 return err; 405 } 406 407 static const int rtm_min[RTM_NR_FAMILIES] = 408 { 409 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 410 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 411 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 412 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 413 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 414 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 415 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 416 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 417 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 418 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 419 }; 420 421 static const int rta_max[RTM_NR_FAMILIES] = 422 { 423 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 424 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 425 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 426 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 427 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 428 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 429 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 430 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 431 }; 432 433 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 434 { 435 struct rtattr *rta; 436 int size = RTA_LENGTH(attrlen); 437 438 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); 439 rta->rta_type = attrtype; 440 rta->rta_len = size; 441 memcpy(RTA_DATA(rta), data, attrlen); 442 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 443 } 444 445 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) 446 { 447 size_t ret = RTA_PAYLOAD(rta); 448 char *src = RTA_DATA(rta); 449 450 if (ret > 0 && src[ret - 1] == '\0') 451 ret--; 452 if (size > 0) { 453 size_t len = (ret >= size) ? size - 1 : ret; 454 memset(dest, 0, size); 455 memcpy(dest, src, len); 456 } 457 return ret; 458 } 459 460 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 461 { 462 struct sock *rtnl = net->rtnl; 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, struct net *net, u32 pid) 475 { 476 struct sock *rtnl = net->rtnl; 477 478 return nlmsg_unicast(rtnl, skb, pid); 479 } 480 481 int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 482 struct nlmsghdr *nlh, gfp_t flags) 483 { 484 struct sock *rtnl = net->rtnl; 485 int report = 0; 486 487 if (nlh) 488 report = nlmsg_report(nlh); 489 490 return nlmsg_notify(rtnl, skb, pid, group, report, flags); 491 } 492 493 void rtnl_set_sk_err(struct net *net, u32 group, int error) 494 { 495 struct sock *rtnl = net->rtnl; 496 497 netlink_set_err(rtnl, 0, group, error); 498 } 499 500 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 501 { 502 struct nlattr *mx; 503 int i, valid = 0; 504 505 mx = nla_nest_start(skb, RTA_METRICS); 506 if (mx == NULL) 507 return -ENOBUFS; 508 509 for (i = 0; i < RTAX_MAX; i++) { 510 if (metrics[i]) { 511 valid++; 512 NLA_PUT_U32(skb, i+1, metrics[i]); 513 } 514 } 515 516 if (!valid) { 517 nla_nest_cancel(skb, mx); 518 return 0; 519 } 520 521 return nla_nest_end(skb, mx); 522 523 nla_put_failure: 524 return nla_nest_cancel(skb, mx); 525 } 526 527 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 528 u32 ts, u32 tsage, long expires, u32 error) 529 { 530 struct rta_cacheinfo ci = { 531 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 532 .rta_used = dst->__use, 533 .rta_clntref = atomic_read(&(dst->__refcnt)), 534 .rta_error = error, 535 .rta_id = id, 536 .rta_ts = ts, 537 .rta_tsage = tsage, 538 }; 539 540 if (expires) 541 ci.rta_expires = jiffies_to_clock_t(expires); 542 543 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 544 } 545 546 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 547 548 static void set_operstate(struct net_device *dev, unsigned char transition) 549 { 550 unsigned char operstate = dev->operstate; 551 552 switch(transition) { 553 case IF_OPER_UP: 554 if ((operstate == IF_OPER_DORMANT || 555 operstate == IF_OPER_UNKNOWN) && 556 !netif_dormant(dev)) 557 operstate = IF_OPER_UP; 558 break; 559 560 case IF_OPER_DORMANT: 561 if (operstate == IF_OPER_UP || 562 operstate == IF_OPER_UNKNOWN) 563 operstate = IF_OPER_DORMANT; 564 break; 565 } 566 567 if (dev->operstate != operstate) { 568 write_lock_bh(&dev_base_lock); 569 dev->operstate = operstate; 570 write_unlock_bh(&dev_base_lock); 571 netdev_state_change(dev); 572 } 573 } 574 575 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 576 struct net_device_stats *b) 577 { 578 a->rx_packets = b->rx_packets; 579 a->tx_packets = b->tx_packets; 580 a->rx_bytes = b->rx_bytes; 581 a->tx_bytes = b->tx_bytes; 582 a->rx_errors = b->rx_errors; 583 a->tx_errors = b->tx_errors; 584 a->rx_dropped = b->rx_dropped; 585 a->tx_dropped = b->tx_dropped; 586 587 a->multicast = b->multicast; 588 a->collisions = b->collisions; 589 590 a->rx_length_errors = b->rx_length_errors; 591 a->rx_over_errors = b->rx_over_errors; 592 a->rx_crc_errors = b->rx_crc_errors; 593 a->rx_frame_errors = b->rx_frame_errors; 594 a->rx_fifo_errors = b->rx_fifo_errors; 595 a->rx_missed_errors = b->rx_missed_errors; 596 597 a->tx_aborted_errors = b->tx_aborted_errors; 598 a->tx_carrier_errors = b->tx_carrier_errors; 599 a->tx_fifo_errors = b->tx_fifo_errors; 600 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 601 a->tx_window_errors = b->tx_window_errors; 602 603 a->rx_compressed = b->rx_compressed; 604 a->tx_compressed = b->tx_compressed; 605 }; 606 607 static inline size_t if_nlmsg_size(const struct net_device *dev) 608 { 609 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 610 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 611 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 612 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 613 + nla_total_size(sizeof(struct rtnl_link_stats)) 614 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 615 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 616 + nla_total_size(4) /* IFLA_TXQLEN */ 617 + nla_total_size(4) /* IFLA_WEIGHT */ 618 + nla_total_size(4) /* IFLA_MTU */ 619 + nla_total_size(4) /* IFLA_LINK */ 620 + nla_total_size(4) /* IFLA_MASTER */ 621 + nla_total_size(1) /* IFLA_OPERSTATE */ 622 + nla_total_size(1) /* IFLA_LINKMODE */ 623 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 624 } 625 626 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 627 int type, u32 pid, u32 seq, u32 change, 628 unsigned int flags) 629 { 630 struct ifinfomsg *ifm; 631 struct nlmsghdr *nlh; 632 633 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 634 if (nlh == NULL) 635 return -EMSGSIZE; 636 637 ifm = nlmsg_data(nlh); 638 ifm->ifi_family = AF_UNSPEC; 639 ifm->__ifi_pad = 0; 640 ifm->ifi_type = dev->type; 641 ifm->ifi_index = dev->ifindex; 642 ifm->ifi_flags = dev_get_flags(dev); 643 ifm->ifi_change = change; 644 645 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 646 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 647 NLA_PUT_U8(skb, IFLA_OPERSTATE, 648 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 649 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 650 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 651 652 if (dev->ifindex != dev->iflink) 653 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 654 655 if (dev->master) 656 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 657 658 if (dev->qdisc_sleeping) 659 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); 660 661 if (1) { 662 struct rtnl_link_ifmap map = { 663 .mem_start = dev->mem_start, 664 .mem_end = dev->mem_end, 665 .base_addr = dev->base_addr, 666 .irq = dev->irq, 667 .dma = dev->dma, 668 .port = dev->if_port, 669 }; 670 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 671 } 672 673 if (dev->addr_len) { 674 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 675 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 676 } 677 678 if (dev->get_stats) { 679 struct net_device_stats *stats = dev->get_stats(dev); 680 if (stats) { 681 struct nlattr *attr; 682 683 attr = nla_reserve(skb, IFLA_STATS, 684 sizeof(struct rtnl_link_stats)); 685 if (attr == NULL) 686 goto nla_put_failure; 687 688 copy_rtnl_link_stats(nla_data(attr), stats); 689 } 690 } 691 692 if (dev->rtnl_link_ops) { 693 if (rtnl_link_fill(skb, dev) < 0) 694 goto nla_put_failure; 695 } 696 697 return nlmsg_end(skb, nlh); 698 699 nla_put_failure: 700 nlmsg_cancel(skb, nlh); 701 return -EMSGSIZE; 702 } 703 704 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 705 { 706 struct net *net = skb->sk->sk_net; 707 int idx; 708 int s_idx = cb->args[0]; 709 struct net_device *dev; 710 711 idx = 0; 712 for_each_netdev(net, dev) { 713 if (idx < s_idx) 714 goto cont; 715 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 716 NETLINK_CB(cb->skb).pid, 717 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) 718 break; 719 cont: 720 idx++; 721 } 722 cb->args[0] = idx; 723 724 return skb->len; 725 } 726 727 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 728 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 729 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 730 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 731 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 732 [IFLA_MTU] = { .type = NLA_U32 }, 733 [IFLA_TXQLEN] = { .type = NLA_U32 }, 734 [IFLA_WEIGHT] = { .type = NLA_U32 }, 735 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 736 [IFLA_LINKMODE] = { .type = NLA_U8 }, 737 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 738 }; 739 740 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 741 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 742 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 743 }; 744 745 static struct net *get_net_ns_by_pid(pid_t pid) 746 { 747 struct task_struct *tsk; 748 struct net *net; 749 750 /* Lookup the network namespace */ 751 net = ERR_PTR(-ESRCH); 752 rcu_read_lock(); 753 tsk = find_task_by_vpid(pid); 754 if (tsk) { 755 struct nsproxy *nsproxy; 756 nsproxy = task_nsproxy(tsk); 757 if (nsproxy) 758 net = get_net(nsproxy->net_ns); 759 } 760 rcu_read_unlock(); 761 return net; 762 } 763 764 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 765 struct nlattr **tb, char *ifname, int modified) 766 { 767 int send_addr_notify = 0; 768 int err; 769 770 if (tb[IFLA_NET_NS_PID]) { 771 struct net *net; 772 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 773 if (IS_ERR(net)) { 774 err = PTR_ERR(net); 775 goto errout; 776 } 777 err = dev_change_net_namespace(dev, net, ifname); 778 put_net(net); 779 if (err) 780 goto errout; 781 modified = 1; 782 } 783 784 if (tb[IFLA_MAP]) { 785 struct rtnl_link_ifmap *u_map; 786 struct ifmap k_map; 787 788 if (!dev->set_config) { 789 err = -EOPNOTSUPP; 790 goto errout; 791 } 792 793 if (!netif_device_present(dev)) { 794 err = -ENODEV; 795 goto errout; 796 } 797 798 u_map = nla_data(tb[IFLA_MAP]); 799 k_map.mem_start = (unsigned long) u_map->mem_start; 800 k_map.mem_end = (unsigned long) u_map->mem_end; 801 k_map.base_addr = (unsigned short) u_map->base_addr; 802 k_map.irq = (unsigned char) u_map->irq; 803 k_map.dma = (unsigned char) u_map->dma; 804 k_map.port = (unsigned char) u_map->port; 805 806 err = dev->set_config(dev, &k_map); 807 if (err < 0) 808 goto errout; 809 810 modified = 1; 811 } 812 813 if (tb[IFLA_ADDRESS]) { 814 struct sockaddr *sa; 815 int len; 816 817 if (!dev->set_mac_address) { 818 err = -EOPNOTSUPP; 819 goto errout; 820 } 821 822 if (!netif_device_present(dev)) { 823 err = -ENODEV; 824 goto errout; 825 } 826 827 len = sizeof(sa_family_t) + dev->addr_len; 828 sa = kmalloc(len, GFP_KERNEL); 829 if (!sa) { 830 err = -ENOMEM; 831 goto errout; 832 } 833 sa->sa_family = dev->type; 834 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 835 dev->addr_len); 836 err = dev->set_mac_address(dev, sa); 837 kfree(sa); 838 if (err) 839 goto errout; 840 send_addr_notify = 1; 841 modified = 1; 842 } 843 844 if (tb[IFLA_MTU]) { 845 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 846 if (err < 0) 847 goto errout; 848 modified = 1; 849 } 850 851 /* 852 * Interface selected by interface index but interface 853 * name provided implies that a name change has been 854 * requested. 855 */ 856 if (ifm->ifi_index > 0 && ifname[0]) { 857 err = dev_change_name(dev, ifname); 858 if (err < 0) 859 goto errout; 860 modified = 1; 861 } 862 863 if (tb[IFLA_BROADCAST]) { 864 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 865 send_addr_notify = 1; 866 } 867 868 if (ifm->ifi_flags || ifm->ifi_change) { 869 unsigned int flags = ifm->ifi_flags; 870 871 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 872 if (ifm->ifi_change) 873 flags = (flags & ifm->ifi_change) | 874 (dev->flags & ~ifm->ifi_change); 875 dev_change_flags(dev, flags); 876 } 877 878 if (tb[IFLA_TXQLEN]) 879 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 880 881 if (tb[IFLA_OPERSTATE]) 882 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 883 884 if (tb[IFLA_LINKMODE]) { 885 write_lock_bh(&dev_base_lock); 886 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 887 write_unlock_bh(&dev_base_lock); 888 } 889 890 err = 0; 891 892 errout: 893 if (err < 0 && modified && net_ratelimit()) 894 printk(KERN_WARNING "A link change request failed with " 895 "some changes comitted already. Interface %s may " 896 "have been left with an inconsistent configuration, " 897 "please check.\n", dev->name); 898 899 if (send_addr_notify) 900 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 901 return err; 902 } 903 904 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 905 { 906 struct net *net = skb->sk->sk_net; 907 struct ifinfomsg *ifm; 908 struct net_device *dev; 909 int err; 910 struct nlattr *tb[IFLA_MAX+1]; 911 char ifname[IFNAMSIZ]; 912 913 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 914 if (err < 0) 915 goto errout; 916 917 if (tb[IFLA_IFNAME]) 918 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 919 else 920 ifname[0] = '\0'; 921 922 err = -EINVAL; 923 ifm = nlmsg_data(nlh); 924 if (ifm->ifi_index > 0) 925 dev = dev_get_by_index(net, ifm->ifi_index); 926 else if (tb[IFLA_IFNAME]) 927 dev = dev_get_by_name(net, ifname); 928 else 929 goto errout; 930 931 if (dev == NULL) { 932 err = -ENODEV; 933 goto errout; 934 } 935 936 if (tb[IFLA_ADDRESS] && 937 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 938 goto errout_dev; 939 940 if (tb[IFLA_BROADCAST] && 941 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 942 goto errout_dev; 943 944 err = do_setlink(dev, ifm, tb, ifname, 0); 945 errout_dev: 946 dev_put(dev); 947 errout: 948 return err; 949 } 950 951 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 952 { 953 struct net *net = skb->sk->sk_net; 954 const struct rtnl_link_ops *ops; 955 struct net_device *dev; 956 struct ifinfomsg *ifm; 957 char ifname[IFNAMSIZ]; 958 struct nlattr *tb[IFLA_MAX+1]; 959 int err; 960 961 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 962 if (err < 0) 963 return err; 964 965 if (tb[IFLA_IFNAME]) 966 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 967 968 ifm = nlmsg_data(nlh); 969 if (ifm->ifi_index > 0) 970 dev = __dev_get_by_index(net, ifm->ifi_index); 971 else if (tb[IFLA_IFNAME]) 972 dev = __dev_get_by_name(net, ifname); 973 else 974 return -EINVAL; 975 976 if (!dev) 977 return -ENODEV; 978 979 ops = dev->rtnl_link_ops; 980 if (!ops) 981 return -EOPNOTSUPP; 982 983 ops->dellink(dev); 984 return 0; 985 } 986 987 struct net_device *rtnl_create_link(struct net *net, char *ifname, 988 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 989 { 990 int err; 991 struct net_device *dev; 992 993 err = -ENOMEM; 994 dev = alloc_netdev(ops->priv_size, ifname, ops->setup); 995 if (!dev) 996 goto err; 997 998 if (strchr(dev->name, '%')) { 999 err = dev_alloc_name(dev, dev->name); 1000 if (err < 0) 1001 goto err_free; 1002 } 1003 1004 dev->nd_net = net; 1005 dev->rtnl_link_ops = ops; 1006 1007 if (tb[IFLA_MTU]) 1008 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1009 if (tb[IFLA_ADDRESS]) 1010 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1011 nla_len(tb[IFLA_ADDRESS])); 1012 if (tb[IFLA_BROADCAST]) 1013 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1014 nla_len(tb[IFLA_BROADCAST])); 1015 if (tb[IFLA_TXQLEN]) 1016 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1017 if (tb[IFLA_OPERSTATE]) 1018 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1019 if (tb[IFLA_LINKMODE]) 1020 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1021 1022 return dev; 1023 1024 err_free: 1025 free_netdev(dev); 1026 err: 1027 return ERR_PTR(err); 1028 } 1029 1030 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1031 { 1032 struct net *net = skb->sk->sk_net; 1033 const struct rtnl_link_ops *ops; 1034 struct net_device *dev; 1035 struct ifinfomsg *ifm; 1036 char kind[MODULE_NAME_LEN]; 1037 char ifname[IFNAMSIZ]; 1038 struct nlattr *tb[IFLA_MAX+1]; 1039 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1040 int err; 1041 1042 #ifdef CONFIG_KMOD 1043 replay: 1044 #endif 1045 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1046 if (err < 0) 1047 return err; 1048 1049 if (tb[IFLA_IFNAME]) 1050 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1051 else 1052 ifname[0] = '\0'; 1053 1054 ifm = nlmsg_data(nlh); 1055 if (ifm->ifi_index > 0) 1056 dev = __dev_get_by_index(net, ifm->ifi_index); 1057 else if (ifname[0]) 1058 dev = __dev_get_by_name(net, ifname); 1059 else 1060 dev = NULL; 1061 1062 if (tb[IFLA_LINKINFO]) { 1063 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1064 tb[IFLA_LINKINFO], ifla_info_policy); 1065 if (err < 0) 1066 return err; 1067 } else 1068 memset(linkinfo, 0, sizeof(linkinfo)); 1069 1070 if (linkinfo[IFLA_INFO_KIND]) { 1071 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1072 ops = rtnl_link_ops_get(kind); 1073 } else { 1074 kind[0] = '\0'; 1075 ops = NULL; 1076 } 1077 1078 if (1) { 1079 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1080 1081 if (ops) { 1082 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1083 err = nla_parse_nested(attr, ops->maxtype, 1084 linkinfo[IFLA_INFO_DATA], 1085 ops->policy); 1086 if (err < 0) 1087 return err; 1088 data = attr; 1089 } 1090 if (ops->validate) { 1091 err = ops->validate(tb, data); 1092 if (err < 0) 1093 return err; 1094 } 1095 } 1096 1097 if (dev) { 1098 int modified = 0; 1099 1100 if (nlh->nlmsg_flags & NLM_F_EXCL) 1101 return -EEXIST; 1102 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1103 return -EOPNOTSUPP; 1104 1105 if (linkinfo[IFLA_INFO_DATA]) { 1106 if (!ops || ops != dev->rtnl_link_ops || 1107 !ops->changelink) 1108 return -EOPNOTSUPP; 1109 1110 err = ops->changelink(dev, tb, data); 1111 if (err < 0) 1112 return err; 1113 modified = 1; 1114 } 1115 1116 return do_setlink(dev, ifm, tb, ifname, modified); 1117 } 1118 1119 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1120 return -ENODEV; 1121 1122 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) 1123 return -EOPNOTSUPP; 1124 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1125 return -EOPNOTSUPP; 1126 1127 if (!ops) { 1128 #ifdef CONFIG_KMOD 1129 if (kind[0]) { 1130 __rtnl_unlock(); 1131 request_module("rtnl-link-%s", kind); 1132 rtnl_lock(); 1133 ops = rtnl_link_ops_get(kind); 1134 if (ops) 1135 goto replay; 1136 } 1137 #endif 1138 return -EOPNOTSUPP; 1139 } 1140 1141 if (!ifname[0]) 1142 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1143 1144 dev = rtnl_create_link(net, ifname, ops, tb); 1145 1146 if (IS_ERR(dev)) 1147 err = PTR_ERR(dev); 1148 else if (ops->newlink) 1149 err = ops->newlink(dev, tb, data); 1150 else 1151 err = register_netdevice(dev); 1152 1153 if (err < 0 && !IS_ERR(dev)) 1154 free_netdev(dev); 1155 return err; 1156 } 1157 } 1158 1159 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1160 { 1161 struct net *net = skb->sk->sk_net; 1162 struct ifinfomsg *ifm; 1163 struct nlattr *tb[IFLA_MAX+1]; 1164 struct net_device *dev = NULL; 1165 struct sk_buff *nskb; 1166 int err; 1167 1168 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1169 if (err < 0) 1170 return err; 1171 1172 ifm = nlmsg_data(nlh); 1173 if (ifm->ifi_index > 0) { 1174 dev = dev_get_by_index(net, ifm->ifi_index); 1175 if (dev == NULL) 1176 return -ENODEV; 1177 } else 1178 return -EINVAL; 1179 1180 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1181 if (nskb == NULL) { 1182 err = -ENOBUFS; 1183 goto errout; 1184 } 1185 1186 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1187 nlh->nlmsg_seq, 0, 0); 1188 if (err < 0) { 1189 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1190 WARN_ON(err == -EMSGSIZE); 1191 kfree_skb(nskb); 1192 goto errout; 1193 } 1194 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1195 errout: 1196 dev_put(dev); 1197 1198 return err; 1199 } 1200 1201 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1202 { 1203 int idx; 1204 int s_idx = cb->family; 1205 1206 if (s_idx == 0) 1207 s_idx = 1; 1208 for (idx=1; idx<NPROTO; idx++) { 1209 int type = cb->nlh->nlmsg_type-RTM_BASE; 1210 if (idx < s_idx || idx == PF_PACKET) 1211 continue; 1212 if (rtnl_msg_handlers[idx] == NULL || 1213 rtnl_msg_handlers[idx][type].dumpit == NULL) 1214 continue; 1215 if (idx > s_idx) 1216 memset(&cb->args[0], 0, sizeof(cb->args)); 1217 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1218 break; 1219 } 1220 cb->family = idx; 1221 1222 return skb->len; 1223 } 1224 1225 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1226 { 1227 struct net *net = dev->nd_net; 1228 struct sk_buff *skb; 1229 int err = -ENOBUFS; 1230 1231 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1232 if (skb == NULL) 1233 goto errout; 1234 1235 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1236 if (err < 0) { 1237 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1238 WARN_ON(err == -EMSGSIZE); 1239 kfree_skb(skb); 1240 goto errout; 1241 } 1242 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1243 errout: 1244 if (err < 0) 1245 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1246 } 1247 1248 /* Protected by RTNL sempahore. */ 1249 static struct rtattr **rta_buf; 1250 static int rtattr_max; 1251 1252 /* Process one rtnetlink message. */ 1253 1254 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1255 { 1256 struct net *net = skb->sk->sk_net; 1257 rtnl_doit_func doit; 1258 int sz_idx, kind; 1259 int min_len; 1260 int family; 1261 int type; 1262 int err; 1263 1264 type = nlh->nlmsg_type; 1265 if (type > RTM_MAX) 1266 return -EOPNOTSUPP; 1267 1268 type -= RTM_BASE; 1269 1270 /* All the messages must have at least 1 byte length */ 1271 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1272 return 0; 1273 1274 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; 1275 if (family >= NPROTO) 1276 return -EAFNOSUPPORT; 1277 1278 sz_idx = type>>2; 1279 kind = type&3; 1280 1281 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1282 return -EPERM; 1283 1284 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1285 struct sock *rtnl; 1286 rtnl_dumpit_func dumpit; 1287 1288 dumpit = rtnl_get_dumpit(family, type); 1289 if (dumpit == NULL) 1290 return -EOPNOTSUPP; 1291 1292 __rtnl_unlock(); 1293 rtnl = net->rtnl; 1294 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1295 rtnl_lock(); 1296 return err; 1297 } 1298 1299 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1300 1301 min_len = rtm_min[sz_idx]; 1302 if (nlh->nlmsg_len < min_len) 1303 return -EINVAL; 1304 1305 if (nlh->nlmsg_len > min_len) { 1306 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1307 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); 1308 1309 while (RTA_OK(attr, attrlen)) { 1310 unsigned flavor = attr->rta_type; 1311 if (flavor) { 1312 if (flavor > rta_max[sz_idx]) 1313 return -EINVAL; 1314 rta_buf[flavor-1] = attr; 1315 } 1316 attr = RTA_NEXT(attr, attrlen); 1317 } 1318 } 1319 1320 doit = rtnl_get_doit(family, type); 1321 if (doit == NULL) 1322 return -EOPNOTSUPP; 1323 1324 return doit(skb, nlh, (void *)&rta_buf[0]); 1325 } 1326 1327 static void rtnetlink_rcv(struct sk_buff *skb) 1328 { 1329 rtnl_lock(); 1330 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1331 rtnl_unlock(); 1332 } 1333 1334 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1335 { 1336 struct net_device *dev = ptr; 1337 1338 switch (event) { 1339 case NETDEV_UNREGISTER: 1340 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 1341 break; 1342 case NETDEV_REGISTER: 1343 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1344 break; 1345 case NETDEV_UP: 1346 case NETDEV_DOWN: 1347 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 1348 break; 1349 case NETDEV_CHANGE: 1350 case NETDEV_GOING_DOWN: 1351 break; 1352 default: 1353 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1354 break; 1355 } 1356 return NOTIFY_DONE; 1357 } 1358 1359 static struct notifier_block rtnetlink_dev_notifier = { 1360 .notifier_call = rtnetlink_event, 1361 }; 1362 1363 1364 static int rtnetlink_net_init(struct net *net) 1365 { 1366 struct sock *sk; 1367 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1368 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1369 if (!sk) 1370 return -ENOMEM; 1371 net->rtnl = sk; 1372 return 0; 1373 } 1374 1375 static void rtnetlink_net_exit(struct net *net) 1376 { 1377 netlink_kernel_release(net->rtnl); 1378 net->rtnl = NULL; 1379 } 1380 1381 static struct pernet_operations rtnetlink_net_ops = { 1382 .init = rtnetlink_net_init, 1383 .exit = rtnetlink_net_exit, 1384 }; 1385 1386 void __init rtnetlink_init(void) 1387 { 1388 int i; 1389 1390 rtattr_max = 0; 1391 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1392 if (rta_max[i] > rtattr_max) 1393 rtattr_max = rta_max[i]; 1394 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1395 if (!rta_buf) 1396 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1397 1398 if (register_pernet_subsys(&rtnetlink_net_ops)) 1399 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1400 1401 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1402 register_netdevice_notifier(&rtnetlink_dev_notifier); 1403 1404 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1405 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1406 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1407 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1408 1409 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1410 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1411 } 1412 1413 EXPORT_SYMBOL(__rta_fill); 1414 EXPORT_SYMBOL(rtattr_strlcpy); 1415 EXPORT_SYMBOL(rtattr_parse); 1416 EXPORT_SYMBOL(__rtattr_parse_nested_compat); 1417 EXPORT_SYMBOL(rtnetlink_put_metrics); 1418 EXPORT_SYMBOL(rtnl_lock); 1419 EXPORT_SYMBOL(rtnl_trylock); 1420 EXPORT_SYMBOL(rtnl_unlock); 1421 EXPORT_SYMBOL(rtnl_unicast); 1422 EXPORT_SYMBOL(rtnl_notify); 1423 EXPORT_SYMBOL(rtnl_set_sk_err); 1424 EXPORT_SYMBOL(rtnl_create_link); 1425 EXPORT_SYMBOL(ifla_policy); 1426