rtnetlink.c revision 4edb246626be6e031950205c885bdf29fb2ff1eb
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/pci.h> 39 40#include <asm/uaccess.h> 41#include <asm/system.h> 42 43#include <linux/inet.h> 44#include <linux/netdevice.h> 45#include <net/ip.h> 46#include <net/protocol.h> 47#include <net/arp.h> 48#include <net/route.h> 49#include <net/udp.h> 50#include <net/sock.h> 51#include <net/pkt_sched.h> 52#include <net/fib_rules.h> 53#include <net/rtnetlink.h> 54#include <net/net_namespace.h> 55 56struct rtnl_link { 57 rtnl_doit_func doit; 58 rtnl_dumpit_func dumpit; 59}; 60 61static DEFINE_MUTEX(rtnl_mutex); 62 63void rtnl_lock(void) 64{ 65 mutex_lock(&rtnl_mutex); 66} 67EXPORT_SYMBOL(rtnl_lock); 68 69void __rtnl_unlock(void) 70{ 71 mutex_unlock(&rtnl_mutex); 72} 73 74void rtnl_unlock(void) 75{ 76 /* This fellow will unlock it for us. */ 77 netdev_run_todo(); 78} 79EXPORT_SYMBOL(rtnl_unlock); 80 81int rtnl_trylock(void) 82{ 83 return mutex_trylock(&rtnl_mutex); 84} 85EXPORT_SYMBOL(rtnl_trylock); 86 87int rtnl_is_locked(void) 88{ 89 return mutex_is_locked(&rtnl_mutex); 90} 91EXPORT_SYMBOL(rtnl_is_locked); 92 93static struct rtnl_link *rtnl_msg_handlers[NPROTO]; 94 95static inline int rtm_msgindex(int msgtype) 96{ 97 int msgindex = msgtype - RTM_BASE; 98 99 /* 100 * msgindex < 0 implies someone tried to register a netlink 101 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 102 * the message type has not been added to linux/rtnetlink.h 103 */ 104 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 105 106 return msgindex; 107} 108 109static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 110{ 111 struct rtnl_link *tab; 112 113 tab = rtnl_msg_handlers[protocol]; 114 if (tab == NULL || tab[msgindex].doit == NULL) 115 tab = rtnl_msg_handlers[PF_UNSPEC]; 116 117 return tab ? tab[msgindex].doit : NULL; 118} 119 120static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 121{ 122 struct rtnl_link *tab; 123 124 tab = rtnl_msg_handlers[protocol]; 125 if (tab == NULL || tab[msgindex].dumpit == NULL) 126 tab = rtnl_msg_handlers[PF_UNSPEC]; 127 128 return tab ? tab[msgindex].dumpit : NULL; 129} 130 131/** 132 * __rtnl_register - Register a rtnetlink message type 133 * @protocol: Protocol family or PF_UNSPEC 134 * @msgtype: rtnetlink message type 135 * @doit: Function pointer called for each request message 136 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 137 * 138 * Registers the specified function pointers (at least one of them has 139 * to be non-NULL) to be called whenever a request message for the 140 * specified protocol family and message type is received. 141 * 142 * The special protocol family PF_UNSPEC may be used to define fallback 143 * function pointers for the case when no entry for the specific protocol 144 * family exists. 145 * 146 * Returns 0 on success or a negative error code. 147 */ 148int __rtnl_register(int protocol, int msgtype, 149 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 150{ 151 struct rtnl_link *tab; 152 int msgindex; 153 154 BUG_ON(protocol < 0 || protocol >= NPROTO); 155 msgindex = rtm_msgindex(msgtype); 156 157 tab = rtnl_msg_handlers[protocol]; 158 if (tab == NULL) { 159 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 160 if (tab == NULL) 161 return -ENOBUFS; 162 163 rtnl_msg_handlers[protocol] = tab; 164 } 165 166 if (doit) 167 tab[msgindex].doit = doit; 168 169 if (dumpit) 170 tab[msgindex].dumpit = dumpit; 171 172 return 0; 173} 174EXPORT_SYMBOL_GPL(__rtnl_register); 175 176/** 177 * rtnl_register - Register a rtnetlink message type 178 * 179 * Identical to __rtnl_register() but panics on failure. This is useful 180 * as failure of this function is very unlikely, it can only happen due 181 * to lack of memory when allocating the chain to store all message 182 * handlers for a protocol. Meant for use in init functions where lack 183 * of memory implies no sense in continueing. 184 */ 185void rtnl_register(int protocol, int msgtype, 186 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 187{ 188 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 189 panic("Unable to register rtnetlink message handler, " 190 "protocol = %d, message type = %d\n", 191 protocol, msgtype); 192} 193EXPORT_SYMBOL_GPL(rtnl_register); 194 195/** 196 * rtnl_unregister - Unregister a rtnetlink message type 197 * @protocol: Protocol family or PF_UNSPEC 198 * @msgtype: rtnetlink message type 199 * 200 * Returns 0 on success or a negative error code. 201 */ 202int rtnl_unregister(int protocol, int msgtype) 203{ 204 int msgindex; 205 206 BUG_ON(protocol < 0 || protocol >= NPROTO); 207 msgindex = rtm_msgindex(msgtype); 208 209 if (rtnl_msg_handlers[protocol] == NULL) 210 return -ENOENT; 211 212 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 213 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 214 215 return 0; 216} 217EXPORT_SYMBOL_GPL(rtnl_unregister); 218 219/** 220 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 221 * @protocol : Protocol family or PF_UNSPEC 222 * 223 * Identical to calling rtnl_unregster() for all registered message types 224 * of a certain protocol family. 225 */ 226void rtnl_unregister_all(int protocol) 227{ 228 BUG_ON(protocol < 0 || protocol >= NPROTO); 229 230 kfree(rtnl_msg_handlers[protocol]); 231 rtnl_msg_handlers[protocol] = NULL; 232} 233EXPORT_SYMBOL_GPL(rtnl_unregister_all); 234 235static LIST_HEAD(link_ops); 236 237/** 238 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 239 * @ops: struct rtnl_link_ops * to register 240 * 241 * The caller must hold the rtnl_mutex. This function should be used 242 * by drivers that create devices during module initialization. It 243 * must be called before registering the devices. 244 * 245 * Returns 0 on success or a negative error code. 246 */ 247int __rtnl_link_register(struct rtnl_link_ops *ops) 248{ 249 if (!ops->dellink) 250 ops->dellink = unregister_netdevice_queue; 251 252 list_add_tail(&ops->list, &link_ops); 253 return 0; 254} 255EXPORT_SYMBOL_GPL(__rtnl_link_register); 256 257/** 258 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 259 * @ops: struct rtnl_link_ops * to register 260 * 261 * Returns 0 on success or a negative error code. 262 */ 263int rtnl_link_register(struct rtnl_link_ops *ops) 264{ 265 int err; 266 267 rtnl_lock(); 268 err = __rtnl_link_register(ops); 269 rtnl_unlock(); 270 return err; 271} 272EXPORT_SYMBOL_GPL(rtnl_link_register); 273 274static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 275{ 276 struct net_device *dev; 277 LIST_HEAD(list_kill); 278 279 for_each_netdev(net, dev) { 280 if (dev->rtnl_link_ops == ops) 281 ops->dellink(dev, &list_kill); 282 } 283 unregister_netdevice_many(&list_kill); 284} 285 286void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 287{ 288 rtnl_lock(); 289 __rtnl_kill_links(net, ops); 290 rtnl_unlock(); 291} 292EXPORT_SYMBOL_GPL(rtnl_kill_links); 293 294/** 295 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 296 * @ops: struct rtnl_link_ops * to unregister 297 * 298 * The caller must hold the rtnl_mutex. 299 */ 300void __rtnl_link_unregister(struct rtnl_link_ops *ops) 301{ 302 struct net *net; 303 304 for_each_net(net) { 305 __rtnl_kill_links(net, ops); 306 } 307 list_del(&ops->list); 308} 309EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 310 311/** 312 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 313 * @ops: struct rtnl_link_ops * to unregister 314 */ 315void rtnl_link_unregister(struct rtnl_link_ops *ops) 316{ 317 rtnl_lock(); 318 __rtnl_link_unregister(ops); 319 rtnl_unlock(); 320} 321EXPORT_SYMBOL_GPL(rtnl_link_unregister); 322 323static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 324{ 325 const struct rtnl_link_ops *ops; 326 327 list_for_each_entry(ops, &link_ops, list) { 328 if (!strcmp(ops->kind, kind)) 329 return ops; 330 } 331 return NULL; 332} 333 334static size_t rtnl_link_get_size(const struct net_device *dev) 335{ 336 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 337 size_t size; 338 339 if (!ops) 340 return 0; 341 342 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 343 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 344 345 if (ops->get_size) 346 /* IFLA_INFO_DATA + nested data */ 347 size += nlmsg_total_size(sizeof(struct nlattr)) + 348 ops->get_size(dev); 349 350 if (ops->get_xstats_size) 351 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ 352 353 return size; 354} 355 356static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 357{ 358 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 359 struct nlattr *linkinfo, *data; 360 int err = -EMSGSIZE; 361 362 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 363 if (linkinfo == NULL) 364 goto out; 365 366 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 367 goto err_cancel_link; 368 if (ops->fill_xstats) { 369 err = ops->fill_xstats(skb, dev); 370 if (err < 0) 371 goto err_cancel_link; 372 } 373 if (ops->fill_info) { 374 data = nla_nest_start(skb, IFLA_INFO_DATA); 375 if (data == NULL) 376 goto err_cancel_link; 377 err = ops->fill_info(skb, dev); 378 if (err < 0) 379 goto err_cancel_data; 380 nla_nest_end(skb, data); 381 } 382 383 nla_nest_end(skb, linkinfo); 384 return 0; 385 386err_cancel_data: 387 nla_nest_cancel(skb, data); 388err_cancel_link: 389 nla_nest_cancel(skb, linkinfo); 390out: 391 return err; 392} 393 394static const int rtm_min[RTM_NR_FAMILIES] = 395{ 396 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 397 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 398 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 399 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 400 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 401 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 402 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 403 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 404 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 405 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 406}; 407 408static const int rta_max[RTM_NR_FAMILIES] = 409{ 410 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 411 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 412 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 413 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 414 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 415 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 416 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 417 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 418}; 419 420void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 421{ 422 struct rtattr *rta; 423 int size = RTA_LENGTH(attrlen); 424 425 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); 426 rta->rta_type = attrtype; 427 rta->rta_len = size; 428 memcpy(RTA_DATA(rta), data, attrlen); 429 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 430} 431EXPORT_SYMBOL(__rta_fill); 432 433int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 434{ 435 struct sock *rtnl = net->rtnl; 436 int err = 0; 437 438 NETLINK_CB(skb).dst_group = group; 439 if (echo) 440 atomic_inc(&skb->users); 441 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 442 if (echo) 443 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 444 return err; 445} 446 447int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 448{ 449 struct sock *rtnl = net->rtnl; 450 451 return nlmsg_unicast(rtnl, skb, pid); 452} 453EXPORT_SYMBOL(rtnl_unicast); 454 455void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 456 struct nlmsghdr *nlh, gfp_t flags) 457{ 458 struct sock *rtnl = net->rtnl; 459 int report = 0; 460 461 if (nlh) 462 report = nlmsg_report(nlh); 463 464 nlmsg_notify(rtnl, skb, pid, group, report, flags); 465} 466EXPORT_SYMBOL(rtnl_notify); 467 468void rtnl_set_sk_err(struct net *net, u32 group, int error) 469{ 470 struct sock *rtnl = net->rtnl; 471 472 netlink_set_err(rtnl, 0, group, error); 473} 474EXPORT_SYMBOL(rtnl_set_sk_err); 475 476int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 477{ 478 struct nlattr *mx; 479 int i, valid = 0; 480 481 mx = nla_nest_start(skb, RTA_METRICS); 482 if (mx == NULL) 483 return -ENOBUFS; 484 485 for (i = 0; i < RTAX_MAX; i++) { 486 if (metrics[i]) { 487 valid++; 488 NLA_PUT_U32(skb, i+1, metrics[i]); 489 } 490 } 491 492 if (!valid) { 493 nla_nest_cancel(skb, mx); 494 return 0; 495 } 496 497 return nla_nest_end(skb, mx); 498 499nla_put_failure: 500 nla_nest_cancel(skb, mx); 501 return -EMSGSIZE; 502} 503EXPORT_SYMBOL(rtnetlink_put_metrics); 504 505int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 506 u32 ts, u32 tsage, long expires, u32 error) 507{ 508 struct rta_cacheinfo ci = { 509 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 510 .rta_used = dst->__use, 511 .rta_clntref = atomic_read(&(dst->__refcnt)), 512 .rta_error = error, 513 .rta_id = id, 514 .rta_ts = ts, 515 .rta_tsage = tsage, 516 }; 517 518 if (expires) 519 ci.rta_expires = jiffies_to_clock_t(expires); 520 521 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 522} 523EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 524 525static void set_operstate(struct net_device *dev, unsigned char transition) 526{ 527 unsigned char operstate = dev->operstate; 528 529 switch (transition) { 530 case IF_OPER_UP: 531 if ((operstate == IF_OPER_DORMANT || 532 operstate == IF_OPER_UNKNOWN) && 533 !netif_dormant(dev)) 534 operstate = IF_OPER_UP; 535 break; 536 537 case IF_OPER_DORMANT: 538 if (operstate == IF_OPER_UP || 539 operstate == IF_OPER_UNKNOWN) 540 operstate = IF_OPER_DORMANT; 541 break; 542 } 543 544 if (dev->operstate != operstate) { 545 write_lock_bh(&dev_base_lock); 546 dev->operstate = operstate; 547 write_unlock_bh(&dev_base_lock); 548 netdev_state_change(dev); 549 } 550} 551 552static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 553 const struct net_device_stats *b) 554{ 555 a->rx_packets = b->rx_packets; 556 a->tx_packets = b->tx_packets; 557 a->rx_bytes = b->rx_bytes; 558 a->tx_bytes = b->tx_bytes; 559 a->rx_errors = b->rx_errors; 560 a->tx_errors = b->tx_errors; 561 a->rx_dropped = b->rx_dropped; 562 a->tx_dropped = b->tx_dropped; 563 564 a->multicast = b->multicast; 565 a->collisions = b->collisions; 566 567 a->rx_length_errors = b->rx_length_errors; 568 a->rx_over_errors = b->rx_over_errors; 569 a->rx_crc_errors = b->rx_crc_errors; 570 a->rx_frame_errors = b->rx_frame_errors; 571 a->rx_fifo_errors = b->rx_fifo_errors; 572 a->rx_missed_errors = b->rx_missed_errors; 573 574 a->tx_aborted_errors = b->tx_aborted_errors; 575 a->tx_carrier_errors = b->tx_carrier_errors; 576 a->tx_fifo_errors = b->tx_fifo_errors; 577 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 578 a->tx_window_errors = b->tx_window_errors; 579 580 a->rx_compressed = b->rx_compressed; 581 a->tx_compressed = b->tx_compressed; 582}; 583 584static inline int rtnl_vfinfo_size(const struct net_device *dev) 585{ 586 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) 587 return dev_num_vf(dev->dev.parent) * 588 sizeof(struct ifla_vf_info); 589 else 590 return 0; 591} 592 593static inline size_t if_nlmsg_size(const struct net_device *dev) 594{ 595 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 596 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 597 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 598 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 599 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 600 + nla_total_size(sizeof(struct rtnl_link_stats)) 601 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 602 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 603 + nla_total_size(4) /* IFLA_TXQLEN */ 604 + nla_total_size(4) /* IFLA_WEIGHT */ 605 + nla_total_size(4) /* IFLA_MTU */ 606 + nla_total_size(4) /* IFLA_LINK */ 607 + nla_total_size(4) /* IFLA_MASTER */ 608 + nla_total_size(1) /* IFLA_OPERSTATE */ 609 + nla_total_size(1) /* IFLA_LINKMODE */ 610 + nla_total_size(4) /* IFLA_NUM_VF */ 611 + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */ 612 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 613} 614 615static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 616 int type, u32 pid, u32 seq, u32 change, 617 unsigned int flags) 618{ 619 struct ifinfomsg *ifm; 620 struct nlmsghdr *nlh; 621 const struct net_device_stats *stats; 622 struct nlattr *attr; 623 624 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 625 if (nlh == NULL) 626 return -EMSGSIZE; 627 628 ifm = nlmsg_data(nlh); 629 ifm->ifi_family = AF_UNSPEC; 630 ifm->__ifi_pad = 0; 631 ifm->ifi_type = dev->type; 632 ifm->ifi_index = dev->ifindex; 633 ifm->ifi_flags = dev_get_flags(dev); 634 ifm->ifi_change = change; 635 636 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 637 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 638 NLA_PUT_U8(skb, IFLA_OPERSTATE, 639 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 640 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 641 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 642 643 if (dev->ifindex != dev->iflink) 644 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 645 646 if (dev->master) 647 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 648 649 if (dev->qdisc) 650 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 651 652 if (dev->ifalias) 653 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 654 655 if (1) { 656 struct rtnl_link_ifmap map = { 657 .mem_start = dev->mem_start, 658 .mem_end = dev->mem_end, 659 .base_addr = dev->base_addr, 660 .irq = dev->irq, 661 .dma = dev->dma, 662 .port = dev->if_port, 663 }; 664 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 665 } 666 667 if (dev->addr_len) { 668 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 669 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 670 } 671 672 attr = nla_reserve(skb, IFLA_STATS, 673 sizeof(struct rtnl_link_stats)); 674 if (attr == NULL) 675 goto nla_put_failure; 676 677 stats = dev_get_stats(dev); 678 copy_rtnl_link_stats(nla_data(attr), stats); 679 680 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) { 681 int i; 682 struct ifla_vf_info ivi; 683 684 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); 685 for (i = 0; i < dev_num_vf(dev->dev.parent); i++) { 686 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 687 break; 688 NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi); 689 } 690 } 691 if (dev->rtnl_link_ops) { 692 if (rtnl_link_fill(skb, dev) < 0) 693 goto nla_put_failure; 694 } 695 696 return nlmsg_end(skb, nlh); 697 698nla_put_failure: 699 nlmsg_cancel(skb, nlh); 700 return -EMSGSIZE; 701} 702 703static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 704{ 705 struct net *net = sock_net(skb->sk); 706 int h, s_h; 707 int idx = 0, s_idx; 708 struct net_device *dev; 709 struct hlist_head *head; 710 struct hlist_node *node; 711 712 s_h = cb->args[0]; 713 s_idx = cb->args[1]; 714 715 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 716 idx = 0; 717 head = &net->dev_index_head[h]; 718 hlist_for_each_entry(dev, node, head, index_hlist) { 719 if (idx < s_idx) 720 goto cont; 721 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 722 NETLINK_CB(cb->skb).pid, 723 cb->nlh->nlmsg_seq, 0, 724 NLM_F_MULTI) <= 0) 725 goto out; 726cont: 727 idx++; 728 } 729 } 730out: 731 cb->args[1] = idx; 732 cb->args[0] = h; 733 734 return skb->len; 735} 736 737const struct nla_policy ifla_policy[IFLA_MAX+1] = { 738 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 739 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 740 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 741 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 742 [IFLA_MTU] = { .type = NLA_U32 }, 743 [IFLA_LINK] = { .type = NLA_U32 }, 744 [IFLA_TXQLEN] = { .type = NLA_U32 }, 745 [IFLA_WEIGHT] = { .type = NLA_U32 }, 746 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 747 [IFLA_LINKMODE] = { .type = NLA_U8 }, 748 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 749 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 750 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 751 [IFLA_VF_MAC] = { .type = NLA_BINARY, 752 .len = sizeof(struct ifla_vf_mac) }, 753 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 754 .len = sizeof(struct ifla_vf_vlan) }, 755 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 756 .len = sizeof(struct ifla_vf_tx_rate) }, 757}; 758EXPORT_SYMBOL(ifla_policy); 759 760static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 761 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 762 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 763}; 764 765struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 766{ 767 struct net *net; 768 /* Examine the link attributes and figure out which 769 * network namespace we are talking about. 770 */ 771 if (tb[IFLA_NET_NS_PID]) 772 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 773 else 774 net = get_net(src_net); 775 return net; 776} 777EXPORT_SYMBOL(rtnl_link_get_net); 778 779static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 780{ 781 if (dev) { 782 if (tb[IFLA_ADDRESS] && 783 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 784 return -EINVAL; 785 786 if (tb[IFLA_BROADCAST] && 787 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 788 return -EINVAL; 789 } 790 791 return 0; 792} 793 794static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 795 struct nlattr **tb, char *ifname, int modified) 796{ 797 const struct net_device_ops *ops = dev->netdev_ops; 798 int send_addr_notify = 0; 799 int err; 800 801 if (tb[IFLA_NET_NS_PID]) { 802 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 803 if (IS_ERR(net)) { 804 err = PTR_ERR(net); 805 goto errout; 806 } 807 err = dev_change_net_namespace(dev, net, ifname); 808 put_net(net); 809 if (err) 810 goto errout; 811 modified = 1; 812 } 813 814 if (tb[IFLA_MAP]) { 815 struct rtnl_link_ifmap *u_map; 816 struct ifmap k_map; 817 818 if (!ops->ndo_set_config) { 819 err = -EOPNOTSUPP; 820 goto errout; 821 } 822 823 if (!netif_device_present(dev)) { 824 err = -ENODEV; 825 goto errout; 826 } 827 828 u_map = nla_data(tb[IFLA_MAP]); 829 k_map.mem_start = (unsigned long) u_map->mem_start; 830 k_map.mem_end = (unsigned long) u_map->mem_end; 831 k_map.base_addr = (unsigned short) u_map->base_addr; 832 k_map.irq = (unsigned char) u_map->irq; 833 k_map.dma = (unsigned char) u_map->dma; 834 k_map.port = (unsigned char) u_map->port; 835 836 err = ops->ndo_set_config(dev, &k_map); 837 if (err < 0) 838 goto errout; 839 840 modified = 1; 841 } 842 843 if (tb[IFLA_ADDRESS]) { 844 struct sockaddr *sa; 845 int len; 846 847 if (!ops->ndo_set_mac_address) { 848 err = -EOPNOTSUPP; 849 goto errout; 850 } 851 852 if (!netif_device_present(dev)) { 853 err = -ENODEV; 854 goto errout; 855 } 856 857 len = sizeof(sa_family_t) + dev->addr_len; 858 sa = kmalloc(len, GFP_KERNEL); 859 if (!sa) { 860 err = -ENOMEM; 861 goto errout; 862 } 863 sa->sa_family = dev->type; 864 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 865 dev->addr_len); 866 err = ops->ndo_set_mac_address(dev, sa); 867 kfree(sa); 868 if (err) 869 goto errout; 870 send_addr_notify = 1; 871 modified = 1; 872 } 873 874 if (tb[IFLA_MTU]) { 875 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 876 if (err < 0) 877 goto errout; 878 modified = 1; 879 } 880 881 /* 882 * Interface selected by interface index but interface 883 * name provided implies that a name change has been 884 * requested. 885 */ 886 if (ifm->ifi_index > 0 && ifname[0]) { 887 err = dev_change_name(dev, ifname); 888 if (err < 0) 889 goto errout; 890 modified = 1; 891 } 892 893 if (tb[IFLA_IFALIAS]) { 894 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 895 nla_len(tb[IFLA_IFALIAS])); 896 if (err < 0) 897 goto errout; 898 modified = 1; 899 } 900 901 if (tb[IFLA_BROADCAST]) { 902 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 903 send_addr_notify = 1; 904 } 905 906 if (ifm->ifi_flags || ifm->ifi_change) { 907 unsigned int flags = ifm->ifi_flags; 908 909 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 910 if (ifm->ifi_change) 911 flags = (flags & ifm->ifi_change) | 912 (dev->flags & ~ifm->ifi_change); 913 err = dev_change_flags(dev, flags); 914 if (err < 0) 915 goto errout; 916 } 917 918 if (tb[IFLA_TXQLEN]) 919 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 920 921 if (tb[IFLA_OPERSTATE]) 922 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 923 924 if (tb[IFLA_LINKMODE]) { 925 write_lock_bh(&dev_base_lock); 926 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 927 write_unlock_bh(&dev_base_lock); 928 } 929 930 if (tb[IFLA_VF_MAC]) { 931 struct ifla_vf_mac *ivm; 932 ivm = nla_data(tb[IFLA_VF_MAC]); 933 err = -EOPNOTSUPP; 934 if (ops->ndo_set_vf_mac) 935 err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac); 936 if (err < 0) 937 goto errout; 938 modified = 1; 939 } 940 941 if (tb[IFLA_VF_VLAN]) { 942 struct ifla_vf_vlan *ivv; 943 ivv = nla_data(tb[IFLA_VF_VLAN]); 944 err = -EOPNOTSUPP; 945 if (ops->ndo_set_vf_vlan) 946 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 947 ivv->vlan, 948 ivv->qos); 949 if (err < 0) 950 goto errout; 951 modified = 1; 952 } 953 err = 0; 954 955 if (tb[IFLA_VF_TX_RATE]) { 956 struct ifla_vf_tx_rate *ivt; 957 ivt = nla_data(tb[IFLA_VF_TX_RATE]); 958 err = -EOPNOTSUPP; 959 if (ops->ndo_set_vf_tx_rate) 960 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate); 961 if (err < 0) 962 goto errout; 963 modified = 1; 964 } 965 err = 0; 966 967errout: 968 if (err < 0 && modified && net_ratelimit()) 969 printk(KERN_WARNING "A link change request failed with " 970 "some changes comitted already. Interface %s may " 971 "have been left with an inconsistent configuration, " 972 "please check.\n", dev->name); 973 974 if (send_addr_notify) 975 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 976 return err; 977} 978 979static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 980{ 981 struct net *net = sock_net(skb->sk); 982 struct ifinfomsg *ifm; 983 struct net_device *dev; 984 int err; 985 struct nlattr *tb[IFLA_MAX+1]; 986 char ifname[IFNAMSIZ]; 987 988 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 989 if (err < 0) 990 goto errout; 991 992 if (tb[IFLA_IFNAME]) 993 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 994 else 995 ifname[0] = '\0'; 996 997 err = -EINVAL; 998 ifm = nlmsg_data(nlh); 999 if (ifm->ifi_index > 0) 1000 dev = __dev_get_by_index(net, ifm->ifi_index); 1001 else if (tb[IFLA_IFNAME]) 1002 dev = __dev_get_by_name(net, ifname); 1003 else 1004 goto errout; 1005 1006 if (dev == NULL) { 1007 err = -ENODEV; 1008 goto errout; 1009 } 1010 1011 err = validate_linkmsg(dev, tb); 1012 if (err < 0) 1013 goto errout; 1014 1015 err = do_setlink(dev, ifm, tb, ifname, 0); 1016errout: 1017 return err; 1018} 1019 1020static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1021{ 1022 struct net *net = sock_net(skb->sk); 1023 const struct rtnl_link_ops *ops; 1024 struct net_device *dev; 1025 struct ifinfomsg *ifm; 1026 char ifname[IFNAMSIZ]; 1027 struct nlattr *tb[IFLA_MAX+1]; 1028 int err; 1029 1030 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1031 if (err < 0) 1032 return err; 1033 1034 if (tb[IFLA_IFNAME]) 1035 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1036 1037 ifm = nlmsg_data(nlh); 1038 if (ifm->ifi_index > 0) 1039 dev = __dev_get_by_index(net, ifm->ifi_index); 1040 else if (tb[IFLA_IFNAME]) 1041 dev = __dev_get_by_name(net, ifname); 1042 else 1043 return -EINVAL; 1044 1045 if (!dev) 1046 return -ENODEV; 1047 1048 ops = dev->rtnl_link_ops; 1049 if (!ops) 1050 return -EOPNOTSUPP; 1051 1052 ops->dellink(dev, NULL); 1053 return 0; 1054} 1055 1056struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1057 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1058{ 1059 int err; 1060 struct net_device *dev; 1061 unsigned int num_queues = 1; 1062 unsigned int real_num_queues = 1; 1063 1064 if (ops->get_tx_queues) { 1065 err = ops->get_tx_queues(src_net, tb, &num_queues, 1066 &real_num_queues); 1067 if (err) 1068 goto err; 1069 } 1070 err = -ENOMEM; 1071 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1072 if (!dev) 1073 goto err; 1074 1075 dev_net_set(dev, net); 1076 dev->rtnl_link_ops = ops; 1077 dev->real_num_tx_queues = real_num_queues; 1078 1079 if (strchr(dev->name, '%')) { 1080 err = dev_alloc_name(dev, dev->name); 1081 if (err < 0) 1082 goto err_free; 1083 } 1084 1085 if (tb[IFLA_MTU]) 1086 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1087 if (tb[IFLA_ADDRESS]) 1088 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1089 nla_len(tb[IFLA_ADDRESS])); 1090 if (tb[IFLA_BROADCAST]) 1091 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1092 nla_len(tb[IFLA_BROADCAST])); 1093 if (tb[IFLA_TXQLEN]) 1094 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1095 if (tb[IFLA_OPERSTATE]) 1096 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1097 if (tb[IFLA_LINKMODE]) 1098 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1099 1100 return dev; 1101 1102err_free: 1103 free_netdev(dev); 1104err: 1105 return ERR_PTR(err); 1106} 1107EXPORT_SYMBOL(rtnl_create_link); 1108 1109static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1110{ 1111 struct net *net = sock_net(skb->sk); 1112 const struct rtnl_link_ops *ops; 1113 struct net_device *dev; 1114 struct ifinfomsg *ifm; 1115 char kind[MODULE_NAME_LEN]; 1116 char ifname[IFNAMSIZ]; 1117 struct nlattr *tb[IFLA_MAX+1]; 1118 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1119 int err; 1120 1121#ifdef CONFIG_MODULES 1122replay: 1123#endif 1124 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1125 if (err < 0) 1126 return err; 1127 1128 if (tb[IFLA_IFNAME]) 1129 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1130 else 1131 ifname[0] = '\0'; 1132 1133 ifm = nlmsg_data(nlh); 1134 if (ifm->ifi_index > 0) 1135 dev = __dev_get_by_index(net, ifm->ifi_index); 1136 else if (ifname[0]) 1137 dev = __dev_get_by_name(net, ifname); 1138 else 1139 dev = NULL; 1140 1141 err = validate_linkmsg(dev, tb); 1142 if (err < 0) 1143 return err; 1144 1145 if (tb[IFLA_LINKINFO]) { 1146 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1147 tb[IFLA_LINKINFO], ifla_info_policy); 1148 if (err < 0) 1149 return err; 1150 } else 1151 memset(linkinfo, 0, sizeof(linkinfo)); 1152 1153 if (linkinfo[IFLA_INFO_KIND]) { 1154 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1155 ops = rtnl_link_ops_get(kind); 1156 } else { 1157 kind[0] = '\0'; 1158 ops = NULL; 1159 } 1160 1161 if (1) { 1162 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1163 struct net *dest_net; 1164 1165 if (ops) { 1166 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1167 err = nla_parse_nested(attr, ops->maxtype, 1168 linkinfo[IFLA_INFO_DATA], 1169 ops->policy); 1170 if (err < 0) 1171 return err; 1172 data = attr; 1173 } 1174 if (ops->validate) { 1175 err = ops->validate(tb, data); 1176 if (err < 0) 1177 return err; 1178 } 1179 } 1180 1181 if (dev) { 1182 int modified = 0; 1183 1184 if (nlh->nlmsg_flags & NLM_F_EXCL) 1185 return -EEXIST; 1186 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1187 return -EOPNOTSUPP; 1188 1189 if (linkinfo[IFLA_INFO_DATA]) { 1190 if (!ops || ops != dev->rtnl_link_ops || 1191 !ops->changelink) 1192 return -EOPNOTSUPP; 1193 1194 err = ops->changelink(dev, tb, data); 1195 if (err < 0) 1196 return err; 1197 modified = 1; 1198 } 1199 1200 return do_setlink(dev, ifm, tb, ifname, modified); 1201 } 1202 1203 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1204 return -ENODEV; 1205 1206 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) 1207 return -EOPNOTSUPP; 1208 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1209 return -EOPNOTSUPP; 1210 1211 if (!ops) { 1212#ifdef CONFIG_MODULES 1213 if (kind[0]) { 1214 __rtnl_unlock(); 1215 request_module("rtnl-link-%s", kind); 1216 rtnl_lock(); 1217 ops = rtnl_link_ops_get(kind); 1218 if (ops) 1219 goto replay; 1220 } 1221#endif 1222 return -EOPNOTSUPP; 1223 } 1224 1225 if (!ifname[0]) 1226 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1227 1228 dest_net = rtnl_link_get_net(net, tb); 1229 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1230 1231 if (IS_ERR(dev)) 1232 err = PTR_ERR(dev); 1233 else if (ops->newlink) 1234 err = ops->newlink(net, dev, tb, data); 1235 else 1236 err = register_netdevice(dev); 1237 if (err < 0 && !IS_ERR(dev)) 1238 free_netdev(dev); 1239 1240 put_net(dest_net); 1241 return err; 1242 } 1243} 1244 1245static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1246{ 1247 struct net *net = sock_net(skb->sk); 1248 struct ifinfomsg *ifm; 1249 char ifname[IFNAMSIZ]; 1250 struct nlattr *tb[IFLA_MAX+1]; 1251 struct net_device *dev = NULL; 1252 struct sk_buff *nskb; 1253 int err; 1254 1255 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1256 if (err < 0) 1257 return err; 1258 1259 if (tb[IFLA_IFNAME]) 1260 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1261 1262 ifm = nlmsg_data(nlh); 1263 if (ifm->ifi_index > 0) 1264 dev = __dev_get_by_index(net, ifm->ifi_index); 1265 else if (tb[IFLA_IFNAME]) 1266 dev = __dev_get_by_name(net, ifname); 1267 else 1268 return -EINVAL; 1269 1270 if (dev == NULL) 1271 return -ENODEV; 1272 1273 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1274 if (nskb == NULL) 1275 return -ENOBUFS; 1276 1277 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1278 nlh->nlmsg_seq, 0, 0); 1279 if (err < 0) { 1280 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1281 WARN_ON(err == -EMSGSIZE); 1282 kfree_skb(nskb); 1283 } else 1284 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1285 1286 return err; 1287} 1288 1289static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1290{ 1291 int idx; 1292 int s_idx = cb->family; 1293 1294 if (s_idx == 0) 1295 s_idx = 1; 1296 for (idx = 1; idx < NPROTO; idx++) { 1297 int type = cb->nlh->nlmsg_type-RTM_BASE; 1298 if (idx < s_idx || idx == PF_PACKET) 1299 continue; 1300 if (rtnl_msg_handlers[idx] == NULL || 1301 rtnl_msg_handlers[idx][type].dumpit == NULL) 1302 continue; 1303 if (idx > s_idx) 1304 memset(&cb->args[0], 0, sizeof(cb->args)); 1305 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1306 break; 1307 } 1308 cb->family = idx; 1309 1310 return skb->len; 1311} 1312 1313void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1314{ 1315 struct net *net = dev_net(dev); 1316 struct sk_buff *skb; 1317 int err = -ENOBUFS; 1318 1319 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1320 if (skb == NULL) 1321 goto errout; 1322 1323 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1324 if (err < 0) { 1325 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1326 WARN_ON(err == -EMSGSIZE); 1327 kfree_skb(skb); 1328 goto errout; 1329 } 1330 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1331 return; 1332errout: 1333 if (err < 0) 1334 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1335} 1336 1337/* Protected by RTNL sempahore. */ 1338static struct rtattr **rta_buf; 1339static int rtattr_max; 1340 1341/* Process one rtnetlink message. */ 1342 1343static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1344{ 1345 struct net *net = sock_net(skb->sk); 1346 rtnl_doit_func doit; 1347 int sz_idx, kind; 1348 int min_len; 1349 int family; 1350 int type; 1351 int err; 1352 1353 type = nlh->nlmsg_type; 1354 if (type > RTM_MAX) 1355 return -EOPNOTSUPP; 1356 1357 type -= RTM_BASE; 1358 1359 /* All the messages must have at least 1 byte length */ 1360 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1361 return 0; 1362 1363 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1364 if (family >= NPROTO) 1365 return -EAFNOSUPPORT; 1366 1367 sz_idx = type>>2; 1368 kind = type&3; 1369 1370 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1371 return -EPERM; 1372 1373 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1374 struct sock *rtnl; 1375 rtnl_dumpit_func dumpit; 1376 1377 dumpit = rtnl_get_dumpit(family, type); 1378 if (dumpit == NULL) 1379 return -EOPNOTSUPP; 1380 1381 __rtnl_unlock(); 1382 rtnl = net->rtnl; 1383 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1384 rtnl_lock(); 1385 return err; 1386 } 1387 1388 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1389 1390 min_len = rtm_min[sz_idx]; 1391 if (nlh->nlmsg_len < min_len) 1392 return -EINVAL; 1393 1394 if (nlh->nlmsg_len > min_len) { 1395 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1396 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1397 1398 while (RTA_OK(attr, attrlen)) { 1399 unsigned flavor = attr->rta_type; 1400 if (flavor) { 1401 if (flavor > rta_max[sz_idx]) 1402 return -EINVAL; 1403 rta_buf[flavor-1] = attr; 1404 } 1405 attr = RTA_NEXT(attr, attrlen); 1406 } 1407 } 1408 1409 doit = rtnl_get_doit(family, type); 1410 if (doit == NULL) 1411 return -EOPNOTSUPP; 1412 1413 return doit(skb, nlh, (void *)&rta_buf[0]); 1414} 1415 1416static void rtnetlink_rcv(struct sk_buff *skb) 1417{ 1418 rtnl_lock(); 1419 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1420 rtnl_unlock(); 1421} 1422 1423static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1424{ 1425 struct net_device *dev = ptr; 1426 1427 switch (event) { 1428 case NETDEV_UNREGISTER: 1429 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 1430 break; 1431 case NETDEV_UP: 1432 case NETDEV_DOWN: 1433 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 1434 break; 1435 case NETDEV_POST_INIT: 1436 case NETDEV_REGISTER: 1437 case NETDEV_CHANGE: 1438 case NETDEV_GOING_DOWN: 1439 case NETDEV_UNREGISTER_BATCH: 1440 break; 1441 default: 1442 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1443 break; 1444 } 1445 return NOTIFY_DONE; 1446} 1447 1448static struct notifier_block rtnetlink_dev_notifier = { 1449 .notifier_call = rtnetlink_event, 1450}; 1451 1452 1453static int __net_init rtnetlink_net_init(struct net *net) 1454{ 1455 struct sock *sk; 1456 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1457 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1458 if (!sk) 1459 return -ENOMEM; 1460 net->rtnl = sk; 1461 return 0; 1462} 1463 1464static void __net_exit rtnetlink_net_exit(struct net *net) 1465{ 1466 netlink_kernel_release(net->rtnl); 1467 net->rtnl = NULL; 1468} 1469 1470static struct pernet_operations rtnetlink_net_ops = { 1471 .init = rtnetlink_net_init, 1472 .exit = rtnetlink_net_exit, 1473}; 1474 1475void __init rtnetlink_init(void) 1476{ 1477 int i; 1478 1479 rtattr_max = 0; 1480 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1481 if (rta_max[i] > rtattr_max) 1482 rtattr_max = rta_max[i]; 1483 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1484 if (!rta_buf) 1485 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1486 1487 if (register_pernet_subsys(&rtnetlink_net_ops)) 1488 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1489 1490 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1491 register_netdevice_notifier(&rtnetlink_dev_notifier); 1492 1493 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1494 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1495 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1496 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1497 1498 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1499 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1500} 1501 1502