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 39 #include <asm/uaccess.h> 40 #include <asm/system.h> 41 42 #include <linux/inet.h> 43 #include <linux/netdevice.h> 44 #include <net/ip.h> 45 #include <net/protocol.h> 46 #include <net/arp.h> 47 #include <net/route.h> 48 #include <net/udp.h> 49 #include <net/sock.h> 50 #include <net/pkt_sched.h> 51 #include <net/fib_rules.h> 52 #include <net/rtnetlink.h> 53 #include <net/net_namespace.h> 54 55 struct rtnl_link { 56 rtnl_doit_func doit; 57 rtnl_dumpit_func dumpit; 58 }; 59 60 static DEFINE_MUTEX(rtnl_mutex); 61 62 void rtnl_lock(void) 63 { 64 mutex_lock(&rtnl_mutex); 65 } 66 EXPORT_SYMBOL(rtnl_lock); 67 68 void __rtnl_unlock(void) 69 { 70 mutex_unlock(&rtnl_mutex); 71 } 72 73 void rtnl_unlock(void) 74 { 75 /* This fellow will unlock it for us. */ 76 netdev_run_todo(); 77 } 78 EXPORT_SYMBOL(rtnl_unlock); 79 80 int rtnl_trylock(void) 81 { 82 return mutex_trylock(&rtnl_mutex); 83 } 84 EXPORT_SYMBOL(rtnl_trylock); 85 86 int rtnl_is_locked(void) 87 { 88 return mutex_is_locked(&rtnl_mutex); 89 } 90 EXPORT_SYMBOL(rtnl_is_locked); 91 92 static struct rtnl_link *rtnl_msg_handlers[NPROTO]; 93 94 static inline int rtm_msgindex(int msgtype) 95 { 96 int msgindex = msgtype - RTM_BASE; 97 98 /* 99 * msgindex < 0 implies someone tried to register a netlink 100 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 101 * the message type has not been added to linux/rtnetlink.h 102 */ 103 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 104 105 return msgindex; 106 } 107 108 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 109 { 110 struct rtnl_link *tab; 111 112 tab = rtnl_msg_handlers[protocol]; 113 if (tab == NULL || tab[msgindex].doit == NULL) 114 tab = rtnl_msg_handlers[PF_UNSPEC]; 115 116 return tab ? tab[msgindex].doit : NULL; 117 } 118 119 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 120 { 121 struct rtnl_link *tab; 122 123 tab = rtnl_msg_handlers[protocol]; 124 if (tab == NULL || tab[msgindex].dumpit == NULL) 125 tab = rtnl_msg_handlers[PF_UNSPEC]; 126 127 return tab ? tab[msgindex].dumpit : NULL; 128 } 129 130 /** 131 * __rtnl_register - Register a rtnetlink message type 132 * @protocol: Protocol family or PF_UNSPEC 133 * @msgtype: rtnetlink message type 134 * @doit: Function pointer called for each request message 135 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 136 * 137 * Registers the specified function pointers (at least one of them has 138 * to be non-NULL) to be called whenever a request message for the 139 * specified protocol family and message type is received. 140 * 141 * The special protocol family PF_UNSPEC may be used to define fallback 142 * function pointers for the case when no entry for the specific protocol 143 * family exists. 144 * 145 * Returns 0 on success or a negative error code. 146 */ 147 int __rtnl_register(int protocol, int msgtype, 148 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 149 { 150 struct rtnl_link *tab; 151 int msgindex; 152 153 BUG_ON(protocol < 0 || protocol >= NPROTO); 154 msgindex = rtm_msgindex(msgtype); 155 156 tab = rtnl_msg_handlers[protocol]; 157 if (tab == NULL) { 158 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 159 if (tab == NULL) 160 return -ENOBUFS; 161 162 rtnl_msg_handlers[protocol] = tab; 163 } 164 165 if (doit) 166 tab[msgindex].doit = doit; 167 168 if (dumpit) 169 tab[msgindex].dumpit = dumpit; 170 171 return 0; 172 } 173 EXPORT_SYMBOL_GPL(__rtnl_register); 174 175 /** 176 * rtnl_register - Register a rtnetlink message type 177 * 178 * Identical to __rtnl_register() but panics on failure. This is useful 179 * as failure of this function is very unlikely, it can only happen due 180 * to lack of memory when allocating the chain to store all message 181 * handlers for a protocol. Meant for use in init functions where lack 182 * of memory implies no sense in continueing. 183 */ 184 void rtnl_register(int protocol, int msgtype, 185 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 186 { 187 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 188 panic("Unable to register rtnetlink message handler, " 189 "protocol = %d, message type = %d\n", 190 protocol, msgtype); 191 } 192 EXPORT_SYMBOL_GPL(rtnl_register); 193 194 /** 195 * rtnl_unregister - Unregister a rtnetlink message type 196 * @protocol: Protocol family or PF_UNSPEC 197 * @msgtype: rtnetlink message type 198 * 199 * Returns 0 on success or a negative error code. 200 */ 201 int rtnl_unregister(int protocol, int msgtype) 202 { 203 int msgindex; 204 205 BUG_ON(protocol < 0 || protocol >= NPROTO); 206 msgindex = rtm_msgindex(msgtype); 207 208 if (rtnl_msg_handlers[protocol] == NULL) 209 return -ENOENT; 210 211 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 212 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 213 214 return 0; 215 } 216 EXPORT_SYMBOL_GPL(rtnl_unregister); 217 218 /** 219 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 220 * @protocol : Protocol family or PF_UNSPEC 221 * 222 * Identical to calling rtnl_unregster() for all registered message types 223 * of a certain protocol family. 224 */ 225 void rtnl_unregister_all(int protocol) 226 { 227 BUG_ON(protocol < 0 || protocol >= NPROTO); 228 229 kfree(rtnl_msg_handlers[protocol]); 230 rtnl_msg_handlers[protocol] = NULL; 231 } 232 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 233 234 static LIST_HEAD(link_ops); 235 236 /** 237 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 238 * @ops: struct rtnl_link_ops * to register 239 * 240 * The caller must hold the rtnl_mutex. This function should be used 241 * by drivers that create devices during module initialization. It 242 * must be called before registering the devices. 243 * 244 * Returns 0 on success or a negative error code. 245 */ 246 int __rtnl_link_register(struct rtnl_link_ops *ops) 247 { 248 if (!ops->dellink) 249 ops->dellink = unregister_netdevice_queue; 250 251 list_add_tail(&ops->list, &link_ops); 252 return 0; 253 } 254 EXPORT_SYMBOL_GPL(__rtnl_link_register); 255 256 /** 257 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 258 * @ops: struct rtnl_link_ops * to register 259 * 260 * Returns 0 on success or a negative error code. 261 */ 262 int rtnl_link_register(struct rtnl_link_ops *ops) 263 { 264 int err; 265 266 rtnl_lock(); 267 err = __rtnl_link_register(ops); 268 rtnl_unlock(); 269 return err; 270 } 271 EXPORT_SYMBOL_GPL(rtnl_link_register); 272 273 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 274 { 275 struct net_device *dev; 276 LIST_HEAD(list_kill); 277 278 for_each_netdev(net, dev) { 279 if (dev->rtnl_link_ops == ops) 280 ops->dellink(dev, &list_kill); 281 } 282 unregister_netdevice_many(&list_kill); 283 } 284 285 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 286 { 287 rtnl_lock(); 288 __rtnl_kill_links(net, ops); 289 rtnl_unlock(); 290 } 291 EXPORT_SYMBOL_GPL(rtnl_kill_links); 292 293 /** 294 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 295 * @ops: struct rtnl_link_ops * to unregister 296 * 297 * The caller must hold the rtnl_mutex. 298 */ 299 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 300 { 301 struct net *net; 302 303 for_each_net(net) { 304 __rtnl_kill_links(net, ops); 305 } 306 list_del(&ops->list); 307 } 308 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 309 310 /** 311 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 312 * @ops: struct rtnl_link_ops * to unregister 313 */ 314 void rtnl_link_unregister(struct rtnl_link_ops *ops) 315 { 316 rtnl_lock(); 317 __rtnl_link_unregister(ops); 318 rtnl_unlock(); 319 } 320 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 321 322 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 323 { 324 const struct rtnl_link_ops *ops; 325 326 list_for_each_entry(ops, &link_ops, list) { 327 if (!strcmp(ops->kind, kind)) 328 return ops; 329 } 330 return NULL; 331 } 332 333 static size_t rtnl_link_get_size(const struct net_device *dev) 334 { 335 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 336 size_t size; 337 338 if (!ops) 339 return 0; 340 341 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 342 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 343 344 if (ops->get_size) 345 /* IFLA_INFO_DATA + nested data */ 346 size += nlmsg_total_size(sizeof(struct nlattr)) + 347 ops->get_size(dev); 348 349 if (ops->get_xstats_size) 350 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ 351 352 return size; 353 } 354 355 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 356 { 357 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 358 struct nlattr *linkinfo, *data; 359 int err = -EMSGSIZE; 360 361 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 362 if (linkinfo == NULL) 363 goto out; 364 365 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 366 goto err_cancel_link; 367 if (ops->fill_xstats) { 368 err = ops->fill_xstats(skb, dev); 369 if (err < 0) 370 goto err_cancel_link; 371 } 372 if (ops->fill_info) { 373 data = nla_nest_start(skb, IFLA_INFO_DATA); 374 if (data == NULL) 375 goto err_cancel_link; 376 err = ops->fill_info(skb, dev); 377 if (err < 0) 378 goto err_cancel_data; 379 nla_nest_end(skb, data); 380 } 381 382 nla_nest_end(skb, linkinfo); 383 return 0; 384 385 err_cancel_data: 386 nla_nest_cancel(skb, data); 387 err_cancel_link: 388 nla_nest_cancel(skb, linkinfo); 389 out: 390 return err; 391 } 392 393 static const int rtm_min[RTM_NR_FAMILIES] = 394 { 395 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 396 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 397 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 398 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 399 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 400 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 401 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 402 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 403 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 404 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 405 }; 406 407 static const int rta_max[RTM_NR_FAMILIES] = 408 { 409 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 410 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 411 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 412 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 413 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 414 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 415 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 416 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 417 }; 418 419 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 420 { 421 struct rtattr *rta; 422 int size = RTA_LENGTH(attrlen); 423 424 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); 425 rta->rta_type = attrtype; 426 rta->rta_len = size; 427 memcpy(RTA_DATA(rta), data, attrlen); 428 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 429 } 430 EXPORT_SYMBOL(__rta_fill); 431 432 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 433 { 434 struct sock *rtnl = net->rtnl; 435 int err = 0; 436 437 NETLINK_CB(skb).dst_group = group; 438 if (echo) 439 atomic_inc(&skb->users); 440 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 441 if (echo) 442 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 443 return err; 444 } 445 446 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 447 { 448 struct sock *rtnl = net->rtnl; 449 450 return nlmsg_unicast(rtnl, skb, pid); 451 } 452 EXPORT_SYMBOL(rtnl_unicast); 453 454 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 455 struct nlmsghdr *nlh, gfp_t flags) 456 { 457 struct sock *rtnl = net->rtnl; 458 int report = 0; 459 460 if (nlh) 461 report = nlmsg_report(nlh); 462 463 nlmsg_notify(rtnl, skb, pid, group, report, flags); 464 } 465 EXPORT_SYMBOL(rtnl_notify); 466 467 void rtnl_set_sk_err(struct net *net, u32 group, int error) 468 { 469 struct sock *rtnl = net->rtnl; 470 471 netlink_set_err(rtnl, 0, group, error); 472 } 473 EXPORT_SYMBOL(rtnl_set_sk_err); 474 475 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 476 { 477 struct nlattr *mx; 478 int i, valid = 0; 479 480 mx = nla_nest_start(skb, RTA_METRICS); 481 if (mx == NULL) 482 return -ENOBUFS; 483 484 for (i = 0; i < RTAX_MAX; i++) { 485 if (metrics[i]) { 486 valid++; 487 NLA_PUT_U32(skb, i+1, metrics[i]); 488 } 489 } 490 491 if (!valid) { 492 nla_nest_cancel(skb, mx); 493 return 0; 494 } 495 496 return nla_nest_end(skb, mx); 497 498 nla_put_failure: 499 nla_nest_cancel(skb, mx); 500 return -EMSGSIZE; 501 } 502 EXPORT_SYMBOL(rtnetlink_put_metrics); 503 504 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 505 u32 ts, u32 tsage, long expires, u32 error) 506 { 507 struct rta_cacheinfo ci = { 508 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 509 .rta_used = dst->__use, 510 .rta_clntref = atomic_read(&(dst->__refcnt)), 511 .rta_error = error, 512 .rta_id = id, 513 .rta_ts = ts, 514 .rta_tsage = tsage, 515 }; 516 517 if (expires) 518 ci.rta_expires = jiffies_to_clock_t(expires); 519 520 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 521 } 522 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 523 524 static void set_operstate(struct net_device *dev, unsigned char transition) 525 { 526 unsigned char operstate = dev->operstate; 527 528 switch (transition) { 529 case IF_OPER_UP: 530 if ((operstate == IF_OPER_DORMANT || 531 operstate == IF_OPER_UNKNOWN) && 532 !netif_dormant(dev)) 533 operstate = IF_OPER_UP; 534 break; 535 536 case IF_OPER_DORMANT: 537 if (operstate == IF_OPER_UP || 538 operstate == IF_OPER_UNKNOWN) 539 operstate = IF_OPER_DORMANT; 540 break; 541 } 542 543 if (dev->operstate != operstate) { 544 write_lock_bh(&dev_base_lock); 545 dev->operstate = operstate; 546 write_unlock_bh(&dev_base_lock); 547 netdev_state_change(dev); 548 } 549 } 550 551 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 552 const struct net_device_stats *b) 553 { 554 a->rx_packets = b->rx_packets; 555 a->tx_packets = b->tx_packets; 556 a->rx_bytes = b->rx_bytes; 557 a->tx_bytes = b->tx_bytes; 558 a->rx_errors = b->rx_errors; 559 a->tx_errors = b->tx_errors; 560 a->rx_dropped = b->rx_dropped; 561 a->tx_dropped = b->tx_dropped; 562 563 a->multicast = b->multicast; 564 a->collisions = b->collisions; 565 566 a->rx_length_errors = b->rx_length_errors; 567 a->rx_over_errors = b->rx_over_errors; 568 a->rx_crc_errors = b->rx_crc_errors; 569 a->rx_frame_errors = b->rx_frame_errors; 570 a->rx_fifo_errors = b->rx_fifo_errors; 571 a->rx_missed_errors = b->rx_missed_errors; 572 573 a->tx_aborted_errors = b->tx_aborted_errors; 574 a->tx_carrier_errors = b->tx_carrier_errors; 575 a->tx_fifo_errors = b->tx_fifo_errors; 576 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 577 a->tx_window_errors = b->tx_window_errors; 578 579 a->rx_compressed = b->rx_compressed; 580 a->tx_compressed = b->tx_compressed; 581 }; 582 583 static inline size_t if_nlmsg_size(const struct net_device *dev) 584 { 585 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 586 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 587 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 588 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 589 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 590 + nla_total_size(sizeof(struct rtnl_link_stats)) 591 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 592 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 593 + nla_total_size(4) /* IFLA_TXQLEN */ 594 + nla_total_size(4) /* IFLA_WEIGHT */ 595 + nla_total_size(4) /* IFLA_MTU */ 596 + nla_total_size(4) /* IFLA_LINK */ 597 + nla_total_size(4) /* IFLA_MASTER */ 598 + nla_total_size(1) /* IFLA_OPERSTATE */ 599 + nla_total_size(1) /* IFLA_LINKMODE */ 600 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 601 } 602 603 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 604 int type, u32 pid, u32 seq, u32 change, 605 unsigned int flags) 606 { 607 struct ifinfomsg *ifm; 608 struct nlmsghdr *nlh; 609 const struct net_device_stats *stats; 610 struct nlattr *attr; 611 612 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 613 if (nlh == NULL) 614 return -EMSGSIZE; 615 616 ifm = nlmsg_data(nlh); 617 ifm->ifi_family = AF_UNSPEC; 618 ifm->__ifi_pad = 0; 619 ifm->ifi_type = dev->type; 620 ifm->ifi_index = dev->ifindex; 621 ifm->ifi_flags = dev_get_flags(dev); 622 ifm->ifi_change = change; 623 624 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 625 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 626 NLA_PUT_U8(skb, IFLA_OPERSTATE, 627 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 628 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 629 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 630 631 if (dev->ifindex != dev->iflink) 632 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 633 634 if (dev->master) 635 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 636 637 if (dev->qdisc) 638 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 639 640 if (dev->ifalias) 641 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 642 643 if (1) { 644 struct rtnl_link_ifmap map = { 645 .mem_start = dev->mem_start, 646 .mem_end = dev->mem_end, 647 .base_addr = dev->base_addr, 648 .irq = dev->irq, 649 .dma = dev->dma, 650 .port = dev->if_port, 651 }; 652 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 653 } 654 655 if (dev->addr_len) { 656 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 657 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 658 } 659 660 attr = nla_reserve(skb, IFLA_STATS, 661 sizeof(struct rtnl_link_stats)); 662 if (attr == NULL) 663 goto nla_put_failure; 664 665 stats = dev_get_stats(dev); 666 copy_rtnl_link_stats(nla_data(attr), stats); 667 668 if (dev->rtnl_link_ops) { 669 if (rtnl_link_fill(skb, dev) < 0) 670 goto nla_put_failure; 671 } 672 673 return nlmsg_end(skb, nlh); 674 675 nla_put_failure: 676 nlmsg_cancel(skb, nlh); 677 return -EMSGSIZE; 678 } 679 680 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 681 { 682 struct net *net = sock_net(skb->sk); 683 int h, s_h; 684 int idx = 0, s_idx; 685 struct net_device *dev; 686 struct hlist_head *head; 687 struct hlist_node *node; 688 689 s_h = cb->args[0]; 690 s_idx = cb->args[1]; 691 692 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 693 idx = 0; 694 head = &net->dev_index_head[h]; 695 hlist_for_each_entry(dev, node, head, index_hlist) { 696 if (idx < s_idx) 697 goto cont; 698 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 699 NETLINK_CB(cb->skb).pid, 700 cb->nlh->nlmsg_seq, 0, 701 NLM_F_MULTI) <= 0) 702 goto out; 703 cont: 704 idx++; 705 } 706 } 707 out: 708 cb->args[1] = idx; 709 cb->args[0] = h; 710 711 return skb->len; 712 } 713 714 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 715 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 716 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 717 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 718 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 719 [IFLA_MTU] = { .type = NLA_U32 }, 720 [IFLA_LINK] = { .type = NLA_U32 }, 721 [IFLA_TXQLEN] = { .type = NLA_U32 }, 722 [IFLA_WEIGHT] = { .type = NLA_U32 }, 723 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 724 [IFLA_LINKMODE] = { .type = NLA_U8 }, 725 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 726 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 727 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 728 }; 729 EXPORT_SYMBOL(ifla_policy); 730 731 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 732 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 733 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 734 }; 735 736 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 737 { 738 struct net *net; 739 /* Examine the link attributes and figure out which 740 * network namespace we are talking about. 741 */ 742 if (tb[IFLA_NET_NS_PID]) 743 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 744 else 745 net = get_net(src_net); 746 return net; 747 } 748 EXPORT_SYMBOL(rtnl_link_get_net); 749 750 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 751 { 752 if (dev) { 753 if (tb[IFLA_ADDRESS] && 754 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 755 return -EINVAL; 756 757 if (tb[IFLA_BROADCAST] && 758 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 759 return -EINVAL; 760 } 761 762 return 0; 763 } 764 765 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 766 struct nlattr **tb, char *ifname, int modified) 767 { 768 const struct net_device_ops *ops = dev->netdev_ops; 769 int send_addr_notify = 0; 770 int err; 771 772 if (tb[IFLA_NET_NS_PID]) { 773 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 774 if (IS_ERR(net)) { 775 err = PTR_ERR(net); 776 goto errout; 777 } 778 err = dev_change_net_namespace(dev, net, ifname); 779 put_net(net); 780 if (err) 781 goto errout; 782 modified = 1; 783 } 784 785 if (tb[IFLA_MAP]) { 786 struct rtnl_link_ifmap *u_map; 787 struct ifmap k_map; 788 789 if (!ops->ndo_set_config) { 790 err = -EOPNOTSUPP; 791 goto errout; 792 } 793 794 if (!netif_device_present(dev)) { 795 err = -ENODEV; 796 goto errout; 797 } 798 799 u_map = nla_data(tb[IFLA_MAP]); 800 k_map.mem_start = (unsigned long) u_map->mem_start; 801 k_map.mem_end = (unsigned long) u_map->mem_end; 802 k_map.base_addr = (unsigned short) u_map->base_addr; 803 k_map.irq = (unsigned char) u_map->irq; 804 k_map.dma = (unsigned char) u_map->dma; 805 k_map.port = (unsigned char) u_map->port; 806 807 err = ops->ndo_set_config(dev, &k_map); 808 if (err < 0) 809 goto errout; 810 811 modified = 1; 812 } 813 814 if (tb[IFLA_ADDRESS]) { 815 struct sockaddr *sa; 816 int len; 817 818 if (!ops->ndo_set_mac_address) { 819 err = -EOPNOTSUPP; 820 goto errout; 821 } 822 823 if (!netif_device_present(dev)) { 824 err = -ENODEV; 825 goto errout; 826 } 827 828 len = sizeof(sa_family_t) + dev->addr_len; 829 sa = kmalloc(len, GFP_KERNEL); 830 if (!sa) { 831 err = -ENOMEM; 832 goto errout; 833 } 834 sa->sa_family = dev->type; 835 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 836 dev->addr_len); 837 err = ops->ndo_set_mac_address(dev, sa); 838 kfree(sa); 839 if (err) 840 goto errout; 841 send_addr_notify = 1; 842 modified = 1; 843 } 844 845 if (tb[IFLA_MTU]) { 846 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 847 if (err < 0) 848 goto errout; 849 modified = 1; 850 } 851 852 /* 853 * Interface selected by interface index but interface 854 * name provided implies that a name change has been 855 * requested. 856 */ 857 if (ifm->ifi_index > 0 && ifname[0]) { 858 err = dev_change_name(dev, ifname); 859 if (err < 0) 860 goto errout; 861 modified = 1; 862 } 863 864 if (tb[IFLA_IFALIAS]) { 865 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 866 nla_len(tb[IFLA_IFALIAS])); 867 if (err < 0) 868 goto errout; 869 modified = 1; 870 } 871 872 if (tb[IFLA_BROADCAST]) { 873 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 874 send_addr_notify = 1; 875 } 876 877 if (ifm->ifi_flags || ifm->ifi_change) { 878 unsigned int flags = ifm->ifi_flags; 879 880 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 881 if (ifm->ifi_change) 882 flags = (flags & ifm->ifi_change) | 883 (dev->flags & ~ifm->ifi_change); 884 err = dev_change_flags(dev, flags); 885 if (err < 0) 886 goto errout; 887 } 888 889 if (tb[IFLA_TXQLEN]) 890 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 891 892 if (tb[IFLA_OPERSTATE]) 893 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 894 895 if (tb[IFLA_LINKMODE]) { 896 write_lock_bh(&dev_base_lock); 897 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 898 write_unlock_bh(&dev_base_lock); 899 } 900 901 err = 0; 902 903 errout: 904 if (err < 0 && modified && net_ratelimit()) 905 printk(KERN_WARNING "A link change request failed with " 906 "some changes comitted already. Interface %s may " 907 "have been left with an inconsistent configuration, " 908 "please check.\n", dev->name); 909 910 if (send_addr_notify) 911 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 912 return err; 913 } 914 915 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 916 { 917 struct net *net = sock_net(skb->sk); 918 struct ifinfomsg *ifm; 919 struct net_device *dev; 920 int err; 921 struct nlattr *tb[IFLA_MAX+1]; 922 char ifname[IFNAMSIZ]; 923 924 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 925 if (err < 0) 926 goto errout; 927 928 if (tb[IFLA_IFNAME]) 929 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 930 else 931 ifname[0] = '\0'; 932 933 err = -EINVAL; 934 ifm = nlmsg_data(nlh); 935 if (ifm->ifi_index > 0) 936 dev = __dev_get_by_index(net, ifm->ifi_index); 937 else if (tb[IFLA_IFNAME]) 938 dev = __dev_get_by_name(net, ifname); 939 else 940 goto errout; 941 942 if (dev == NULL) { 943 err = -ENODEV; 944 goto errout; 945 } 946 947 err = validate_linkmsg(dev, tb); 948 if (err < 0) 949 goto errout; 950 951 err = do_setlink(dev, ifm, tb, ifname, 0); 952 errout: 953 return err; 954 } 955 956 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 957 { 958 struct net *net = sock_net(skb->sk); 959 const struct rtnl_link_ops *ops; 960 struct net_device *dev; 961 struct ifinfomsg *ifm; 962 char ifname[IFNAMSIZ]; 963 struct nlattr *tb[IFLA_MAX+1]; 964 int err; 965 966 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 967 if (err < 0) 968 return err; 969 970 if (tb[IFLA_IFNAME]) 971 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 972 973 ifm = nlmsg_data(nlh); 974 if (ifm->ifi_index > 0) 975 dev = __dev_get_by_index(net, ifm->ifi_index); 976 else if (tb[IFLA_IFNAME]) 977 dev = __dev_get_by_name(net, ifname); 978 else 979 return -EINVAL; 980 981 if (!dev) 982 return -ENODEV; 983 984 ops = dev->rtnl_link_ops; 985 if (!ops) 986 return -EOPNOTSUPP; 987 988 ops->dellink(dev, NULL); 989 return 0; 990 } 991 992 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 993 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 994 { 995 int err; 996 struct net_device *dev; 997 unsigned int num_queues = 1; 998 unsigned int real_num_queues = 1; 999 1000 if (ops->get_tx_queues) { 1001 err = ops->get_tx_queues(src_net, tb, &num_queues, 1002 &real_num_queues); 1003 if (err) 1004 goto err; 1005 } 1006 err = -ENOMEM; 1007 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1008 if (!dev) 1009 goto err; 1010 1011 dev_net_set(dev, net); 1012 dev->rtnl_link_ops = ops; 1013 dev->real_num_tx_queues = real_num_queues; 1014 1015 if (strchr(dev->name, '%')) { 1016 err = dev_alloc_name(dev, dev->name); 1017 if (err < 0) 1018 goto err_free; 1019 } 1020 1021 if (tb[IFLA_MTU]) 1022 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1023 if (tb[IFLA_ADDRESS]) 1024 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1025 nla_len(tb[IFLA_ADDRESS])); 1026 if (tb[IFLA_BROADCAST]) 1027 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1028 nla_len(tb[IFLA_BROADCAST])); 1029 if (tb[IFLA_TXQLEN]) 1030 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1031 if (tb[IFLA_OPERSTATE]) 1032 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1033 if (tb[IFLA_LINKMODE]) 1034 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1035 1036 return dev; 1037 1038 err_free: 1039 free_netdev(dev); 1040 err: 1041 return ERR_PTR(err); 1042 } 1043 EXPORT_SYMBOL(rtnl_create_link); 1044 1045 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1046 { 1047 struct net *net = sock_net(skb->sk); 1048 const struct rtnl_link_ops *ops; 1049 struct net_device *dev; 1050 struct ifinfomsg *ifm; 1051 char kind[MODULE_NAME_LEN]; 1052 char ifname[IFNAMSIZ]; 1053 struct nlattr *tb[IFLA_MAX+1]; 1054 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1055 int err; 1056 1057 #ifdef CONFIG_MODULES 1058 replay: 1059 #endif 1060 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1061 if (err < 0) 1062 return err; 1063 1064 if (tb[IFLA_IFNAME]) 1065 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1066 else 1067 ifname[0] = '\0'; 1068 1069 ifm = nlmsg_data(nlh); 1070 if (ifm->ifi_index > 0) 1071 dev = __dev_get_by_index(net, ifm->ifi_index); 1072 else if (ifname[0]) 1073 dev = __dev_get_by_name(net, ifname); 1074 else 1075 dev = NULL; 1076 1077 err = validate_linkmsg(dev, tb); 1078 if (err < 0) 1079 return err; 1080 1081 if (tb[IFLA_LINKINFO]) { 1082 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1083 tb[IFLA_LINKINFO], ifla_info_policy); 1084 if (err < 0) 1085 return err; 1086 } else 1087 memset(linkinfo, 0, sizeof(linkinfo)); 1088 1089 if (linkinfo[IFLA_INFO_KIND]) { 1090 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1091 ops = rtnl_link_ops_get(kind); 1092 } else { 1093 kind[0] = '\0'; 1094 ops = NULL; 1095 } 1096 1097 if (1) { 1098 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1099 struct net *dest_net; 1100 1101 if (ops) { 1102 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1103 err = nla_parse_nested(attr, ops->maxtype, 1104 linkinfo[IFLA_INFO_DATA], 1105 ops->policy); 1106 if (err < 0) 1107 return err; 1108 data = attr; 1109 } 1110 if (ops->validate) { 1111 err = ops->validate(tb, data); 1112 if (err < 0) 1113 return err; 1114 } 1115 } 1116 1117 if (dev) { 1118 int modified = 0; 1119 1120 if (nlh->nlmsg_flags & NLM_F_EXCL) 1121 return -EEXIST; 1122 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1123 return -EOPNOTSUPP; 1124 1125 if (linkinfo[IFLA_INFO_DATA]) { 1126 if (!ops || ops != dev->rtnl_link_ops || 1127 !ops->changelink) 1128 return -EOPNOTSUPP; 1129 1130 err = ops->changelink(dev, tb, data); 1131 if (err < 0) 1132 return err; 1133 modified = 1; 1134 } 1135 1136 return do_setlink(dev, ifm, tb, ifname, modified); 1137 } 1138 1139 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1140 return -ENODEV; 1141 1142 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) 1143 return -EOPNOTSUPP; 1144 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1145 return -EOPNOTSUPP; 1146 1147 if (!ops) { 1148 #ifdef CONFIG_MODULES 1149 if (kind[0]) { 1150 __rtnl_unlock(); 1151 request_module("rtnl-link-%s", kind); 1152 rtnl_lock(); 1153 ops = rtnl_link_ops_get(kind); 1154 if (ops) 1155 goto replay; 1156 } 1157 #endif 1158 return -EOPNOTSUPP; 1159 } 1160 1161 if (!ifname[0]) 1162 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1163 1164 dest_net = rtnl_link_get_net(net, tb); 1165 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1166 1167 if (IS_ERR(dev)) 1168 err = PTR_ERR(dev); 1169 else if (ops->newlink) 1170 err = ops->newlink(net, dev, tb, data); 1171 else 1172 err = register_netdevice(dev); 1173 if (err < 0 && !IS_ERR(dev)) 1174 free_netdev(dev); 1175 1176 put_net(dest_net); 1177 return err; 1178 } 1179 } 1180 1181 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1182 { 1183 struct net *net = sock_net(skb->sk); 1184 struct ifinfomsg *ifm; 1185 char ifname[IFNAMSIZ]; 1186 struct nlattr *tb[IFLA_MAX+1]; 1187 struct net_device *dev = NULL; 1188 struct sk_buff *nskb; 1189 int err; 1190 1191 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1192 if (err < 0) 1193 return err; 1194 1195 if (tb[IFLA_IFNAME]) 1196 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1197 1198 ifm = nlmsg_data(nlh); 1199 if (ifm->ifi_index > 0) 1200 dev = __dev_get_by_index(net, ifm->ifi_index); 1201 else if (tb[IFLA_IFNAME]) 1202 dev = __dev_get_by_name(net, ifname); 1203 else 1204 return -EINVAL; 1205 1206 if (dev == NULL) 1207 return -ENODEV; 1208 1209 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1210 if (nskb == NULL) 1211 return -ENOBUFS; 1212 1213 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1214 nlh->nlmsg_seq, 0, 0); 1215 if (err < 0) { 1216 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1217 WARN_ON(err == -EMSGSIZE); 1218 kfree_skb(nskb); 1219 } else 1220 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1221 1222 return err; 1223 } 1224 1225 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1226 { 1227 int idx; 1228 int s_idx = cb->family; 1229 1230 if (s_idx == 0) 1231 s_idx = 1; 1232 for (idx = 1; idx < NPROTO; idx++) { 1233 int type = cb->nlh->nlmsg_type-RTM_BASE; 1234 if (idx < s_idx || idx == PF_PACKET) 1235 continue; 1236 if (rtnl_msg_handlers[idx] == NULL || 1237 rtnl_msg_handlers[idx][type].dumpit == NULL) 1238 continue; 1239 if (idx > s_idx) 1240 memset(&cb->args[0], 0, sizeof(cb->args)); 1241 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1242 break; 1243 } 1244 cb->family = idx; 1245 1246 return skb->len; 1247 } 1248 1249 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1250 { 1251 struct net *net = dev_net(dev); 1252 struct sk_buff *skb; 1253 int err = -ENOBUFS; 1254 1255 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1256 if (skb == NULL) 1257 goto errout; 1258 1259 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1260 if (err < 0) { 1261 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1262 WARN_ON(err == -EMSGSIZE); 1263 kfree_skb(skb); 1264 goto errout; 1265 } 1266 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1267 return; 1268 errout: 1269 if (err < 0) 1270 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1271 } 1272 1273 /* Protected by RTNL sempahore. */ 1274 static struct rtattr **rta_buf; 1275 static int rtattr_max; 1276 1277 /* Process one rtnetlink message. */ 1278 1279 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1280 { 1281 struct net *net = sock_net(skb->sk); 1282 rtnl_doit_func doit; 1283 int sz_idx, kind; 1284 int min_len; 1285 int family; 1286 int type; 1287 int err; 1288 1289 type = nlh->nlmsg_type; 1290 if (type > RTM_MAX) 1291 return -EOPNOTSUPP; 1292 1293 type -= RTM_BASE; 1294 1295 /* All the messages must have at least 1 byte length */ 1296 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1297 return 0; 1298 1299 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1300 if (family >= NPROTO) 1301 return -EAFNOSUPPORT; 1302 1303 sz_idx = type>>2; 1304 kind = type&3; 1305 1306 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1307 return -EPERM; 1308 1309 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1310 struct sock *rtnl; 1311 rtnl_dumpit_func dumpit; 1312 1313 dumpit = rtnl_get_dumpit(family, type); 1314 if (dumpit == NULL) 1315 return -EOPNOTSUPP; 1316 1317 __rtnl_unlock(); 1318 rtnl = net->rtnl; 1319 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1320 rtnl_lock(); 1321 return err; 1322 } 1323 1324 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1325 1326 min_len = rtm_min[sz_idx]; 1327 if (nlh->nlmsg_len < min_len) 1328 return -EINVAL; 1329 1330 if (nlh->nlmsg_len > min_len) { 1331 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1332 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1333 1334 while (RTA_OK(attr, attrlen)) { 1335 unsigned flavor = attr->rta_type; 1336 if (flavor) { 1337 if (flavor > rta_max[sz_idx]) 1338 return -EINVAL; 1339 rta_buf[flavor-1] = attr; 1340 } 1341 attr = RTA_NEXT(attr, attrlen); 1342 } 1343 } 1344 1345 doit = rtnl_get_doit(family, type); 1346 if (doit == NULL) 1347 return -EOPNOTSUPP; 1348 1349 return doit(skb, nlh, (void *)&rta_buf[0]); 1350 } 1351 1352 static void rtnetlink_rcv(struct sk_buff *skb) 1353 { 1354 rtnl_lock(); 1355 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1356 rtnl_unlock(); 1357 } 1358 1359 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1360 { 1361 struct net_device *dev = ptr; 1362 1363 switch (event) { 1364 case NETDEV_UNREGISTER: 1365 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 1366 break; 1367 case NETDEV_UP: 1368 case NETDEV_DOWN: 1369 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 1370 break; 1371 case NETDEV_POST_INIT: 1372 case NETDEV_REGISTER: 1373 case NETDEV_CHANGE: 1374 case NETDEV_GOING_DOWN: 1375 case NETDEV_UNREGISTER_BATCH: 1376 break; 1377 default: 1378 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1379 break; 1380 } 1381 return NOTIFY_DONE; 1382 } 1383 1384 static struct notifier_block rtnetlink_dev_notifier = { 1385 .notifier_call = rtnetlink_event, 1386 }; 1387 1388 1389 static int rtnetlink_net_init(struct net *net) 1390 { 1391 struct sock *sk; 1392 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1393 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1394 if (!sk) 1395 return -ENOMEM; 1396 net->rtnl = sk; 1397 return 0; 1398 } 1399 1400 static void rtnetlink_net_exit(struct net *net) 1401 { 1402 netlink_kernel_release(net->rtnl); 1403 net->rtnl = NULL; 1404 } 1405 1406 static struct pernet_operations rtnetlink_net_ops = { 1407 .init = rtnetlink_net_init, 1408 .exit = rtnetlink_net_exit, 1409 }; 1410 1411 void __init rtnetlink_init(void) 1412 { 1413 int i; 1414 1415 rtattr_max = 0; 1416 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1417 if (rta_max[i] > rtattr_max) 1418 rtattr_max = rta_max[i]; 1419 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1420 if (!rta_buf) 1421 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1422 1423 if (register_pernet_subsys(&rtnetlink_net_ops)) 1424 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1425 1426 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1427 register_netdevice_notifier(&rtnetlink_dev_notifier); 1428 1429 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1430 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1431 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1432 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1433 1434 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1435 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1436 } 1437 1438