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 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 737 { 738 if (dev) { 739 if (tb[IFLA_ADDRESS] && 740 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 741 return -EINVAL; 742 743 if (tb[IFLA_BROADCAST] && 744 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 745 return -EINVAL; 746 } 747 748 return 0; 749 } 750 751 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 752 struct nlattr **tb, char *ifname, int modified) 753 { 754 const struct net_device_ops *ops = dev->netdev_ops; 755 int send_addr_notify = 0; 756 int err; 757 758 if (tb[IFLA_NET_NS_PID]) { 759 struct net *net; 760 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 761 if (IS_ERR(net)) { 762 err = PTR_ERR(net); 763 goto errout; 764 } 765 err = dev_change_net_namespace(dev, net, ifname); 766 put_net(net); 767 if (err) 768 goto errout; 769 modified = 1; 770 } 771 772 if (tb[IFLA_MAP]) { 773 struct rtnl_link_ifmap *u_map; 774 struct ifmap k_map; 775 776 if (!ops->ndo_set_config) { 777 err = -EOPNOTSUPP; 778 goto errout; 779 } 780 781 if (!netif_device_present(dev)) { 782 err = -ENODEV; 783 goto errout; 784 } 785 786 u_map = nla_data(tb[IFLA_MAP]); 787 k_map.mem_start = (unsigned long) u_map->mem_start; 788 k_map.mem_end = (unsigned long) u_map->mem_end; 789 k_map.base_addr = (unsigned short) u_map->base_addr; 790 k_map.irq = (unsigned char) u_map->irq; 791 k_map.dma = (unsigned char) u_map->dma; 792 k_map.port = (unsigned char) u_map->port; 793 794 err = ops->ndo_set_config(dev, &k_map); 795 if (err < 0) 796 goto errout; 797 798 modified = 1; 799 } 800 801 if (tb[IFLA_ADDRESS]) { 802 struct sockaddr *sa; 803 int len; 804 805 if (!ops->ndo_set_mac_address) { 806 err = -EOPNOTSUPP; 807 goto errout; 808 } 809 810 if (!netif_device_present(dev)) { 811 err = -ENODEV; 812 goto errout; 813 } 814 815 len = sizeof(sa_family_t) + dev->addr_len; 816 sa = kmalloc(len, GFP_KERNEL); 817 if (!sa) { 818 err = -ENOMEM; 819 goto errout; 820 } 821 sa->sa_family = dev->type; 822 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 823 dev->addr_len); 824 err = ops->ndo_set_mac_address(dev, sa); 825 kfree(sa); 826 if (err) 827 goto errout; 828 send_addr_notify = 1; 829 modified = 1; 830 } 831 832 if (tb[IFLA_MTU]) { 833 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 834 if (err < 0) 835 goto errout; 836 modified = 1; 837 } 838 839 /* 840 * Interface selected by interface index but interface 841 * name provided implies that a name change has been 842 * requested. 843 */ 844 if (ifm->ifi_index > 0 && ifname[0]) { 845 err = dev_change_name(dev, ifname); 846 if (err < 0) 847 goto errout; 848 modified = 1; 849 } 850 851 if (tb[IFLA_IFALIAS]) { 852 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 853 nla_len(tb[IFLA_IFALIAS])); 854 if (err < 0) 855 goto errout; 856 modified = 1; 857 } 858 859 if (tb[IFLA_BROADCAST]) { 860 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 861 send_addr_notify = 1; 862 } 863 864 if (ifm->ifi_flags || ifm->ifi_change) { 865 unsigned int flags = ifm->ifi_flags; 866 867 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 868 if (ifm->ifi_change) 869 flags = (flags & ifm->ifi_change) | 870 (dev->flags & ~ifm->ifi_change); 871 err = dev_change_flags(dev, flags); 872 if (err < 0) 873 goto errout; 874 } 875 876 if (tb[IFLA_TXQLEN]) 877 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 878 879 if (tb[IFLA_OPERSTATE]) 880 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 881 882 if (tb[IFLA_LINKMODE]) { 883 write_lock_bh(&dev_base_lock); 884 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 885 write_unlock_bh(&dev_base_lock); 886 } 887 888 err = 0; 889 890 errout: 891 if (err < 0 && modified && net_ratelimit()) 892 printk(KERN_WARNING "A link change request failed with " 893 "some changes comitted already. Interface %s may " 894 "have been left with an inconsistent configuration, " 895 "please check.\n", dev->name); 896 897 if (send_addr_notify) 898 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 899 return err; 900 } 901 902 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 903 { 904 struct net *net = sock_net(skb->sk); 905 struct ifinfomsg *ifm; 906 struct net_device *dev; 907 int err; 908 struct nlattr *tb[IFLA_MAX+1]; 909 char ifname[IFNAMSIZ]; 910 911 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 912 if (err < 0) 913 goto errout; 914 915 if (tb[IFLA_IFNAME]) 916 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 917 else 918 ifname[0] = '\0'; 919 920 err = -EINVAL; 921 ifm = nlmsg_data(nlh); 922 if (ifm->ifi_index > 0) 923 dev = __dev_get_by_index(net, ifm->ifi_index); 924 else if (tb[IFLA_IFNAME]) 925 dev = __dev_get_by_name(net, ifname); 926 else 927 goto errout; 928 929 if (dev == NULL) { 930 err = -ENODEV; 931 goto errout; 932 } 933 934 err = validate_linkmsg(dev, tb); 935 if (err < 0) 936 goto errout; 937 938 err = do_setlink(dev, ifm, tb, ifname, 0); 939 errout: 940 return err; 941 } 942 943 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 944 { 945 struct net *net = sock_net(skb->sk); 946 const struct rtnl_link_ops *ops; 947 struct net_device *dev; 948 struct ifinfomsg *ifm; 949 char ifname[IFNAMSIZ]; 950 struct nlattr *tb[IFLA_MAX+1]; 951 int err; 952 953 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 954 if (err < 0) 955 return err; 956 957 if (tb[IFLA_IFNAME]) 958 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 959 960 ifm = nlmsg_data(nlh); 961 if (ifm->ifi_index > 0) 962 dev = __dev_get_by_index(net, ifm->ifi_index); 963 else if (tb[IFLA_IFNAME]) 964 dev = __dev_get_by_name(net, ifname); 965 else 966 return -EINVAL; 967 968 if (!dev) 969 return -ENODEV; 970 971 ops = dev->rtnl_link_ops; 972 if (!ops) 973 return -EOPNOTSUPP; 974 975 ops->dellink(dev, NULL); 976 return 0; 977 } 978 979 struct net_device *rtnl_create_link(struct net *net, char *ifname, 980 const struct rtnl_link_ops *ops, struct nlattr *tb[]) 981 { 982 int err; 983 struct net_device *dev; 984 unsigned int num_queues = 1; 985 unsigned int real_num_queues = 1; 986 987 if (ops->get_tx_queues) { 988 err = ops->get_tx_queues(net, tb, &num_queues, 989 &real_num_queues); 990 if (err) 991 goto err; 992 } 993 err = -ENOMEM; 994 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 995 if (!dev) 996 goto err; 997 998 dev->real_num_tx_queues = real_num_queues; 999 if (strchr(dev->name, '%')) { 1000 err = dev_alloc_name(dev, dev->name); 1001 if (err < 0) 1002 goto err_free; 1003 } 1004 1005 dev_net_set(dev, net); 1006 dev->rtnl_link_ops = ops; 1007 1008 if (tb[IFLA_MTU]) 1009 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1010 if (tb[IFLA_ADDRESS]) 1011 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1012 nla_len(tb[IFLA_ADDRESS])); 1013 if (tb[IFLA_BROADCAST]) 1014 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1015 nla_len(tb[IFLA_BROADCAST])); 1016 if (tb[IFLA_TXQLEN]) 1017 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1018 if (tb[IFLA_OPERSTATE]) 1019 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1020 if (tb[IFLA_LINKMODE]) 1021 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1022 1023 return dev; 1024 1025 err_free: 1026 free_netdev(dev); 1027 err: 1028 return ERR_PTR(err); 1029 } 1030 EXPORT_SYMBOL(rtnl_create_link); 1031 1032 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1033 { 1034 struct net *net = sock_net(skb->sk); 1035 const struct rtnl_link_ops *ops; 1036 struct net_device *dev; 1037 struct ifinfomsg *ifm; 1038 char kind[MODULE_NAME_LEN]; 1039 char ifname[IFNAMSIZ]; 1040 struct nlattr *tb[IFLA_MAX+1]; 1041 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1042 int err; 1043 1044 #ifdef CONFIG_MODULES 1045 replay: 1046 #endif 1047 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1048 if (err < 0) 1049 return err; 1050 1051 if (tb[IFLA_IFNAME]) 1052 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1053 else 1054 ifname[0] = '\0'; 1055 1056 ifm = nlmsg_data(nlh); 1057 if (ifm->ifi_index > 0) 1058 dev = __dev_get_by_index(net, ifm->ifi_index); 1059 else if (ifname[0]) 1060 dev = __dev_get_by_name(net, ifname); 1061 else 1062 dev = NULL; 1063 1064 err = validate_linkmsg(dev, tb); 1065 if (err < 0) 1066 return err; 1067 1068 if (tb[IFLA_LINKINFO]) { 1069 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1070 tb[IFLA_LINKINFO], ifla_info_policy); 1071 if (err < 0) 1072 return err; 1073 } else 1074 memset(linkinfo, 0, sizeof(linkinfo)); 1075 1076 if (linkinfo[IFLA_INFO_KIND]) { 1077 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1078 ops = rtnl_link_ops_get(kind); 1079 } else { 1080 kind[0] = '\0'; 1081 ops = NULL; 1082 } 1083 1084 if (1) { 1085 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1086 1087 if (ops) { 1088 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1089 err = nla_parse_nested(attr, ops->maxtype, 1090 linkinfo[IFLA_INFO_DATA], 1091 ops->policy); 1092 if (err < 0) 1093 return err; 1094 data = attr; 1095 } 1096 if (ops->validate) { 1097 err = ops->validate(tb, data); 1098 if (err < 0) 1099 return err; 1100 } 1101 } 1102 1103 if (dev) { 1104 int modified = 0; 1105 1106 if (nlh->nlmsg_flags & NLM_F_EXCL) 1107 return -EEXIST; 1108 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1109 return -EOPNOTSUPP; 1110 1111 if (linkinfo[IFLA_INFO_DATA]) { 1112 if (!ops || ops != dev->rtnl_link_ops || 1113 !ops->changelink) 1114 return -EOPNOTSUPP; 1115 1116 err = ops->changelink(dev, tb, data); 1117 if (err < 0) 1118 return err; 1119 modified = 1; 1120 } 1121 1122 return do_setlink(dev, ifm, tb, ifname, modified); 1123 } 1124 1125 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1126 return -ENODEV; 1127 1128 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) 1129 return -EOPNOTSUPP; 1130 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1131 return -EOPNOTSUPP; 1132 1133 if (!ops) { 1134 #ifdef CONFIG_MODULES 1135 if (kind[0]) { 1136 __rtnl_unlock(); 1137 request_module("rtnl-link-%s", kind); 1138 rtnl_lock(); 1139 ops = rtnl_link_ops_get(kind); 1140 if (ops) 1141 goto replay; 1142 } 1143 #endif 1144 return -EOPNOTSUPP; 1145 } 1146 1147 if (!ifname[0]) 1148 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1149 1150 dev = rtnl_create_link(net, ifname, ops, tb); 1151 1152 if (IS_ERR(dev)) 1153 err = PTR_ERR(dev); 1154 else if (ops->newlink) 1155 err = ops->newlink(dev, tb, data); 1156 else 1157 err = register_netdevice(dev); 1158 1159 if (err < 0 && !IS_ERR(dev)) 1160 free_netdev(dev); 1161 return err; 1162 } 1163 } 1164 1165 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1166 { 1167 struct net *net = sock_net(skb->sk); 1168 struct ifinfomsg *ifm; 1169 char ifname[IFNAMSIZ]; 1170 struct nlattr *tb[IFLA_MAX+1]; 1171 struct net_device *dev = NULL; 1172 struct sk_buff *nskb; 1173 int err; 1174 1175 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1176 if (err < 0) 1177 return err; 1178 1179 if (tb[IFLA_IFNAME]) 1180 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1181 1182 ifm = nlmsg_data(nlh); 1183 if (ifm->ifi_index > 0) 1184 dev = __dev_get_by_index(net, ifm->ifi_index); 1185 else if (tb[IFLA_IFNAME]) 1186 dev = __dev_get_by_name(net, ifname); 1187 else 1188 return -EINVAL; 1189 1190 if (dev == NULL) 1191 return -ENODEV; 1192 1193 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1194 if (nskb == NULL) 1195 return -ENOBUFS; 1196 1197 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1198 nlh->nlmsg_seq, 0, 0); 1199 if (err < 0) { 1200 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1201 WARN_ON(err == -EMSGSIZE); 1202 kfree_skb(nskb); 1203 } else 1204 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1205 1206 return err; 1207 } 1208 1209 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1210 { 1211 int idx; 1212 int s_idx = cb->family; 1213 1214 if (s_idx == 0) 1215 s_idx = 1; 1216 for (idx = 1; idx < NPROTO; idx++) { 1217 int type = cb->nlh->nlmsg_type-RTM_BASE; 1218 if (idx < s_idx || idx == PF_PACKET) 1219 continue; 1220 if (rtnl_msg_handlers[idx] == NULL || 1221 rtnl_msg_handlers[idx][type].dumpit == NULL) 1222 continue; 1223 if (idx > s_idx) 1224 memset(&cb->args[0], 0, sizeof(cb->args)); 1225 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1226 break; 1227 } 1228 cb->family = idx; 1229 1230 return skb->len; 1231 } 1232 1233 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1234 { 1235 struct net *net = dev_net(dev); 1236 struct sk_buff *skb; 1237 int err = -ENOBUFS; 1238 1239 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1240 if (skb == NULL) 1241 goto errout; 1242 1243 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1244 if (err < 0) { 1245 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1246 WARN_ON(err == -EMSGSIZE); 1247 kfree_skb(skb); 1248 goto errout; 1249 } 1250 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1251 return; 1252 errout: 1253 if (err < 0) 1254 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1255 } 1256 1257 /* Protected by RTNL sempahore. */ 1258 static struct rtattr **rta_buf; 1259 static int rtattr_max; 1260 1261 /* Process one rtnetlink message. */ 1262 1263 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1264 { 1265 struct net *net = sock_net(skb->sk); 1266 rtnl_doit_func doit; 1267 int sz_idx, kind; 1268 int min_len; 1269 int family; 1270 int type; 1271 int err; 1272 1273 type = nlh->nlmsg_type; 1274 if (type > RTM_MAX) 1275 return -EOPNOTSUPP; 1276 1277 type -= RTM_BASE; 1278 1279 /* All the messages must have at least 1 byte length */ 1280 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1281 return 0; 1282 1283 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1284 if (family >= NPROTO) 1285 return -EAFNOSUPPORT; 1286 1287 sz_idx = type>>2; 1288 kind = type&3; 1289 1290 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1291 return -EPERM; 1292 1293 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1294 struct sock *rtnl; 1295 rtnl_dumpit_func dumpit; 1296 1297 dumpit = rtnl_get_dumpit(family, type); 1298 if (dumpit == NULL) 1299 return -EOPNOTSUPP; 1300 1301 __rtnl_unlock(); 1302 rtnl = net->rtnl; 1303 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1304 rtnl_lock(); 1305 return err; 1306 } 1307 1308 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1309 1310 min_len = rtm_min[sz_idx]; 1311 if (nlh->nlmsg_len < min_len) 1312 return -EINVAL; 1313 1314 if (nlh->nlmsg_len > min_len) { 1315 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1316 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1317 1318 while (RTA_OK(attr, attrlen)) { 1319 unsigned flavor = attr->rta_type; 1320 if (flavor) { 1321 if (flavor > rta_max[sz_idx]) 1322 return -EINVAL; 1323 rta_buf[flavor-1] = attr; 1324 } 1325 attr = RTA_NEXT(attr, attrlen); 1326 } 1327 } 1328 1329 doit = rtnl_get_doit(family, type); 1330 if (doit == NULL) 1331 return -EOPNOTSUPP; 1332 1333 return doit(skb, nlh, (void *)&rta_buf[0]); 1334 } 1335 1336 static void rtnetlink_rcv(struct sk_buff *skb) 1337 { 1338 rtnl_lock(); 1339 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1340 rtnl_unlock(); 1341 } 1342 1343 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1344 { 1345 struct net_device *dev = ptr; 1346 1347 switch (event) { 1348 case NETDEV_UNREGISTER: 1349 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 1350 break; 1351 case NETDEV_REGISTER: 1352 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1353 break; 1354 case NETDEV_UP: 1355 case NETDEV_DOWN: 1356 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 1357 break; 1358 case NETDEV_CHANGE: 1359 case NETDEV_GOING_DOWN: 1360 break; 1361 default: 1362 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1363 break; 1364 } 1365 return NOTIFY_DONE; 1366 } 1367 1368 static struct notifier_block rtnetlink_dev_notifier = { 1369 .notifier_call = rtnetlink_event, 1370 }; 1371 1372 1373 static int rtnetlink_net_init(struct net *net) 1374 { 1375 struct sock *sk; 1376 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1377 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1378 if (!sk) 1379 return -ENOMEM; 1380 net->rtnl = sk; 1381 return 0; 1382 } 1383 1384 static void rtnetlink_net_exit(struct net *net) 1385 { 1386 netlink_kernel_release(net->rtnl); 1387 net->rtnl = NULL; 1388 } 1389 1390 static struct pernet_operations rtnetlink_net_ops = { 1391 .init = rtnetlink_net_init, 1392 .exit = rtnetlink_net_exit, 1393 }; 1394 1395 void __init rtnetlink_init(void) 1396 { 1397 int i; 1398 1399 rtattr_max = 0; 1400 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1401 if (rta_max[i] > rtattr_max) 1402 rtattr_max = rta_max[i]; 1403 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1404 if (!rta_buf) 1405 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1406 1407 if (register_pernet_subsys(&rtnetlink_net_ops)) 1408 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1409 1410 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1411 register_netdevice_notifier(&rtnetlink_dev_notifier); 1412 1413 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1414 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1415 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1416 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1417 1418 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1419 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1420 } 1421 1422