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#include <asm/string.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 55struct rtnl_link 56{ 57 rtnl_doit_func doit; 58 rtnl_dumpit_func dumpit; 59}; 60 61static DEFINE_MUTEX(rtnl_mutex); 62static struct sock *rtnl; 63 64void rtnl_lock(void) 65{ 66 mutex_lock(&rtnl_mutex); 67} 68 69void __rtnl_unlock(void) 70{ 71 mutex_unlock(&rtnl_mutex); 72} 73 74void rtnl_unlock(void) 75{ 76 mutex_unlock(&rtnl_mutex); 77 if (rtnl && rtnl->sk_receive_queue.qlen) 78 rtnl->sk_data_ready(rtnl, 0); 79 netdev_run_todo(); 80} 81 82int rtnl_trylock(void) 83{ 84 return mutex_trylock(&rtnl_mutex); 85} 86 87int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len) 88{ 89 memset(tb, 0, sizeof(struct rtattr*)*maxattr); 90 91 while (RTA_OK(rta, len)) { 92 unsigned flavor = rta->rta_type; 93 if (flavor && flavor <= maxattr) 94 tb[flavor-1] = rta; 95 rta = RTA_NEXT(rta, len); 96 } 97 return 0; 98} 99 100static struct rtnl_link *rtnl_msg_handlers[NPROTO]; 101 102static inline int rtm_msgindex(int msgtype) 103{ 104 int msgindex = msgtype - RTM_BASE; 105 106 /* 107 * msgindex < 0 implies someone tried to register a netlink 108 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 109 * the message type has not been added to linux/rtnetlink.h 110 */ 111 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 112 113 return msgindex; 114} 115 116static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 117{ 118 struct rtnl_link *tab; 119 120 tab = rtnl_msg_handlers[protocol]; 121 if (tab == NULL || tab[msgindex].doit == NULL) 122 tab = rtnl_msg_handlers[PF_UNSPEC]; 123 124 return tab ? tab[msgindex].doit : NULL; 125} 126 127static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 128{ 129 struct rtnl_link *tab; 130 131 tab = rtnl_msg_handlers[protocol]; 132 if (tab == NULL || tab[msgindex].dumpit == NULL) 133 tab = rtnl_msg_handlers[PF_UNSPEC]; 134 135 return tab ? tab[msgindex].dumpit : NULL; 136} 137 138/** 139 * __rtnl_register - Register a rtnetlink message type 140 * @protocol: Protocol family or PF_UNSPEC 141 * @msgtype: rtnetlink message type 142 * @doit: Function pointer called for each request message 143 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 144 * 145 * Registers the specified function pointers (at least one of them has 146 * to be non-NULL) to be called whenever a request message for the 147 * specified protocol family and message type is received. 148 * 149 * The special protocol family PF_UNSPEC may be used to define fallback 150 * function pointers for the case when no entry for the specific protocol 151 * family exists. 152 * 153 * Returns 0 on success or a negative error code. 154 */ 155int __rtnl_register(int protocol, int msgtype, 156 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 157{ 158 struct rtnl_link *tab; 159 int msgindex; 160 161 BUG_ON(protocol < 0 || protocol >= NPROTO); 162 msgindex = rtm_msgindex(msgtype); 163 164 tab = rtnl_msg_handlers[protocol]; 165 if (tab == NULL) { 166 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 167 if (tab == NULL) 168 return -ENOBUFS; 169 170 rtnl_msg_handlers[protocol] = tab; 171 } 172 173 if (doit) 174 tab[msgindex].doit = doit; 175 176 if (dumpit) 177 tab[msgindex].dumpit = dumpit; 178 179 return 0; 180} 181 182EXPORT_SYMBOL_GPL(__rtnl_register); 183 184/** 185 * rtnl_register - Register a rtnetlink message type 186 * 187 * Identical to __rtnl_register() but panics on failure. This is useful 188 * as failure of this function is very unlikely, it can only happen due 189 * to lack of memory when allocating the chain to store all message 190 * handlers for a protocol. Meant for use in init functions where lack 191 * of memory implies no sense in continueing. 192 */ 193void rtnl_register(int protocol, int msgtype, 194 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 195{ 196 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 197 panic("Unable to register rtnetlink message handler, " 198 "protocol = %d, message type = %d\n", 199 protocol, msgtype); 200} 201 202EXPORT_SYMBOL_GPL(rtnl_register); 203 204/** 205 * rtnl_unregister - Unregister a rtnetlink message type 206 * @protocol: Protocol family or PF_UNSPEC 207 * @msgtype: rtnetlink message type 208 * 209 * Returns 0 on success or a negative error code. 210 */ 211int rtnl_unregister(int protocol, int msgtype) 212{ 213 int msgindex; 214 215 BUG_ON(protocol < 0 || protocol >= NPROTO); 216 msgindex = rtm_msgindex(msgtype); 217 218 if (rtnl_msg_handlers[protocol] == NULL) 219 return -ENOENT; 220 221 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 222 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 223 224 return 0; 225} 226 227EXPORT_SYMBOL_GPL(rtnl_unregister); 228 229/** 230 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 231 * @protocol : Protocol family or PF_UNSPEC 232 * 233 * Identical to calling rtnl_unregster() for all registered message types 234 * of a certain protocol family. 235 */ 236void rtnl_unregister_all(int protocol) 237{ 238 BUG_ON(protocol < 0 || protocol >= NPROTO); 239 240 kfree(rtnl_msg_handlers[protocol]); 241 rtnl_msg_handlers[protocol] = NULL; 242} 243 244EXPORT_SYMBOL_GPL(rtnl_unregister_all); 245 246static const int rtm_min[RTM_NR_FAMILIES] = 247{ 248 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 249 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 250 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 251 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 252 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 253 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 254 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 255 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 256 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 257 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 258}; 259 260static const int rta_max[RTM_NR_FAMILIES] = 261{ 262 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 263 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 264 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 265 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 266 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 267 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 268 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 269 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 270}; 271 272void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 273{ 274 struct rtattr *rta; 275 int size = RTA_LENGTH(attrlen); 276 277 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); 278 rta->rta_type = attrtype; 279 rta->rta_len = size; 280 memcpy(RTA_DATA(rta), data, attrlen); 281 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 282} 283 284size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) 285{ 286 size_t ret = RTA_PAYLOAD(rta); 287 char *src = RTA_DATA(rta); 288 289 if (ret > 0 && src[ret - 1] == '\0') 290 ret--; 291 if (size > 0) { 292 size_t len = (ret >= size) ? size - 1 : ret; 293 memset(dest, 0, size); 294 memcpy(dest, src, len); 295 } 296 return ret; 297} 298 299int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) 300{ 301 int err = 0; 302 303 NETLINK_CB(skb).dst_group = group; 304 if (echo) 305 atomic_inc(&skb->users); 306 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 307 if (echo) 308 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 309 return err; 310} 311 312int rtnl_unicast(struct sk_buff *skb, u32 pid) 313{ 314 return nlmsg_unicast(rtnl, skb, pid); 315} 316 317int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group, 318 struct nlmsghdr *nlh, gfp_t flags) 319{ 320 int report = 0; 321 322 if (nlh) 323 report = nlmsg_report(nlh); 324 325 return nlmsg_notify(rtnl, skb, pid, group, report, flags); 326} 327 328void rtnl_set_sk_err(u32 group, int error) 329{ 330 netlink_set_err(rtnl, 0, group, error); 331} 332 333int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 334{ 335 struct nlattr *mx; 336 int i, valid = 0; 337 338 mx = nla_nest_start(skb, RTA_METRICS); 339 if (mx == NULL) 340 return -ENOBUFS; 341 342 for (i = 0; i < RTAX_MAX; i++) { 343 if (metrics[i]) { 344 valid++; 345 NLA_PUT_U32(skb, i+1, metrics[i]); 346 } 347 } 348 349 if (!valid) { 350 nla_nest_cancel(skb, mx); 351 return 0; 352 } 353 354 return nla_nest_end(skb, mx); 355 356nla_put_failure: 357 return nla_nest_cancel(skb, mx); 358} 359 360int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 361 u32 ts, u32 tsage, long expires, u32 error) 362{ 363 struct rta_cacheinfo ci = { 364 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 365 .rta_used = dst->__use, 366 .rta_clntref = atomic_read(&(dst->__refcnt)), 367 .rta_error = error, 368 .rta_id = id, 369 .rta_ts = ts, 370 .rta_tsage = tsage, 371 }; 372 373 if (expires) 374 ci.rta_expires = jiffies_to_clock_t(expires); 375 376 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 377} 378 379EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 380 381static void set_operstate(struct net_device *dev, unsigned char transition) 382{ 383 unsigned char operstate = dev->operstate; 384 385 switch(transition) { 386 case IF_OPER_UP: 387 if ((operstate == IF_OPER_DORMANT || 388 operstate == IF_OPER_UNKNOWN) && 389 !netif_dormant(dev)) 390 operstate = IF_OPER_UP; 391 break; 392 393 case IF_OPER_DORMANT: 394 if (operstate == IF_OPER_UP || 395 operstate == IF_OPER_UNKNOWN) 396 operstate = IF_OPER_DORMANT; 397 break; 398 } 399 400 if (dev->operstate != operstate) { 401 write_lock_bh(&dev_base_lock); 402 dev->operstate = operstate; 403 write_unlock_bh(&dev_base_lock); 404 netdev_state_change(dev); 405 } 406} 407 408static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 409 struct net_device_stats *b) 410{ 411 a->rx_packets = b->rx_packets; 412 a->tx_packets = b->tx_packets; 413 a->rx_bytes = b->rx_bytes; 414 a->tx_bytes = b->tx_bytes; 415 a->rx_errors = b->rx_errors; 416 a->tx_errors = b->tx_errors; 417 a->rx_dropped = b->rx_dropped; 418 a->tx_dropped = b->tx_dropped; 419 420 a->multicast = b->multicast; 421 a->collisions = b->collisions; 422 423 a->rx_length_errors = b->rx_length_errors; 424 a->rx_over_errors = b->rx_over_errors; 425 a->rx_crc_errors = b->rx_crc_errors; 426 a->rx_frame_errors = b->rx_frame_errors; 427 a->rx_fifo_errors = b->rx_fifo_errors; 428 a->rx_missed_errors = b->rx_missed_errors; 429 430 a->tx_aborted_errors = b->tx_aborted_errors; 431 a->tx_carrier_errors = b->tx_carrier_errors; 432 a->tx_fifo_errors = b->tx_fifo_errors; 433 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 434 a->tx_window_errors = b->tx_window_errors; 435 436 a->rx_compressed = b->rx_compressed; 437 a->tx_compressed = b->tx_compressed; 438}; 439 440static inline size_t if_nlmsg_size(void) 441{ 442 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 443 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 444 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 445 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 446 + nla_total_size(sizeof(struct rtnl_link_stats)) 447 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 448 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 449 + nla_total_size(4) /* IFLA_TXQLEN */ 450 + nla_total_size(4) /* IFLA_WEIGHT */ 451 + nla_total_size(4) /* IFLA_MTU */ 452 + nla_total_size(4) /* IFLA_LINK */ 453 + nla_total_size(4) /* IFLA_MASTER */ 454 + nla_total_size(1) /* IFLA_OPERSTATE */ 455 + nla_total_size(1); /* IFLA_LINKMODE */ 456} 457 458static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 459 int type, u32 pid, u32 seq, u32 change, 460 unsigned int flags) 461{ 462 struct ifinfomsg *ifm; 463 struct nlmsghdr *nlh; 464 465 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 466 if (nlh == NULL) 467 return -EMSGSIZE; 468 469 ifm = nlmsg_data(nlh); 470 ifm->ifi_family = AF_UNSPEC; 471 ifm->__ifi_pad = 0; 472 ifm->ifi_type = dev->type; 473 ifm->ifi_index = dev->ifindex; 474 ifm->ifi_flags = dev_get_flags(dev); 475 ifm->ifi_change = change; 476 477 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 478 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 479 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight); 480 NLA_PUT_U8(skb, IFLA_OPERSTATE, 481 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 482 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 483 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 484 485 if (dev->ifindex != dev->iflink) 486 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 487 488 if (dev->master) 489 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 490 491 if (dev->qdisc_sleeping) 492 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); 493 494 if (1) { 495 struct rtnl_link_ifmap map = { 496 .mem_start = dev->mem_start, 497 .mem_end = dev->mem_end, 498 .base_addr = dev->base_addr, 499 .irq = dev->irq, 500 .dma = dev->dma, 501 .port = dev->if_port, 502 }; 503 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 504 } 505 506 if (dev->addr_len) { 507 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 508 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 509 } 510 511 if (dev->get_stats) { 512 struct net_device_stats *stats = dev->get_stats(dev); 513 if (stats) { 514 struct nlattr *attr; 515 516 attr = nla_reserve(skb, IFLA_STATS, 517 sizeof(struct rtnl_link_stats)); 518 if (attr == NULL) 519 goto nla_put_failure; 520 521 copy_rtnl_link_stats(nla_data(attr), stats); 522 } 523 } 524 525 return nlmsg_end(skb, nlh); 526 527nla_put_failure: 528 nlmsg_cancel(skb, nlh); 529 return -EMSGSIZE; 530} 531 532static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 533{ 534 int idx; 535 int s_idx = cb->args[0]; 536 struct net_device *dev; 537 538 idx = 0; 539 for_each_netdev(dev) { 540 if (idx < s_idx) 541 goto cont; 542 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 543 NETLINK_CB(cb->skb).pid, 544 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) 545 break; 546cont: 547 idx++; 548 } 549 cb->args[0] = idx; 550 551 return skb->len; 552} 553 554static const struct nla_policy ifla_policy[IFLA_MAX+1] = { 555 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 556 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 557 [IFLA_MTU] = { .type = NLA_U32 }, 558 [IFLA_TXQLEN] = { .type = NLA_U32 }, 559 [IFLA_WEIGHT] = { .type = NLA_U32 }, 560 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 561 [IFLA_LINKMODE] = { .type = NLA_U8 }, 562}; 563 564static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 565{ 566 struct ifinfomsg *ifm; 567 struct net_device *dev; 568 int err, send_addr_notify = 0, modified = 0; 569 struct nlattr *tb[IFLA_MAX+1]; 570 char ifname[IFNAMSIZ]; 571 572 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 573 if (err < 0) 574 goto errout; 575 576 if (tb[IFLA_IFNAME]) 577 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 578 else 579 ifname[0] = '\0'; 580 581 err = -EINVAL; 582 ifm = nlmsg_data(nlh); 583 if (ifm->ifi_index > 0) 584 dev = dev_get_by_index(ifm->ifi_index); 585 else if (tb[IFLA_IFNAME]) 586 dev = dev_get_by_name(ifname); 587 else 588 goto errout; 589 590 if (dev == NULL) { 591 err = -ENODEV; 592 goto errout; 593 } 594 595 if (tb[IFLA_ADDRESS] && 596 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 597 goto errout_dev; 598 599 if (tb[IFLA_BROADCAST] && 600 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 601 goto errout_dev; 602 603 if (tb[IFLA_MAP]) { 604 struct rtnl_link_ifmap *u_map; 605 struct ifmap k_map; 606 607 if (!dev->set_config) { 608 err = -EOPNOTSUPP; 609 goto errout_dev; 610 } 611 612 if (!netif_device_present(dev)) { 613 err = -ENODEV; 614 goto errout_dev; 615 } 616 617 u_map = nla_data(tb[IFLA_MAP]); 618 k_map.mem_start = (unsigned long) u_map->mem_start; 619 k_map.mem_end = (unsigned long) u_map->mem_end; 620 k_map.base_addr = (unsigned short) u_map->base_addr; 621 k_map.irq = (unsigned char) u_map->irq; 622 k_map.dma = (unsigned char) u_map->dma; 623 k_map.port = (unsigned char) u_map->port; 624 625 err = dev->set_config(dev, &k_map); 626 if (err < 0) 627 goto errout_dev; 628 629 modified = 1; 630 } 631 632 if (tb[IFLA_ADDRESS]) { 633 struct sockaddr *sa; 634 int len; 635 636 if (!dev->set_mac_address) { 637 err = -EOPNOTSUPP; 638 goto errout_dev; 639 } 640 641 if (!netif_device_present(dev)) { 642 err = -ENODEV; 643 goto errout_dev; 644 } 645 646 len = sizeof(sa_family_t) + dev->addr_len; 647 sa = kmalloc(len, GFP_KERNEL); 648 if (!sa) { 649 err = -ENOMEM; 650 goto errout_dev; 651 } 652 sa->sa_family = dev->type; 653 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 654 dev->addr_len); 655 err = dev->set_mac_address(dev, sa); 656 kfree(sa); 657 if (err) 658 goto errout_dev; 659 send_addr_notify = 1; 660 modified = 1; 661 } 662 663 if (tb[IFLA_MTU]) { 664 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 665 if (err < 0) 666 goto errout_dev; 667 modified = 1; 668 } 669 670 /* 671 * Interface selected by interface index but interface 672 * name provided implies that a name change has been 673 * requested. 674 */ 675 if (ifm->ifi_index > 0 && ifname[0]) { 676 err = dev_change_name(dev, ifname); 677 if (err < 0) 678 goto errout_dev; 679 modified = 1; 680 } 681 682 if (tb[IFLA_BROADCAST]) { 683 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 684 send_addr_notify = 1; 685 } 686 687 688 if (ifm->ifi_flags || ifm->ifi_change) { 689 unsigned int flags = ifm->ifi_flags; 690 691 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 692 if (ifm->ifi_change) 693 flags = (flags & ifm->ifi_change) | 694 (dev->flags & ~ifm->ifi_change); 695 dev_change_flags(dev, flags); 696 } 697 698 if (tb[IFLA_TXQLEN]) 699 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 700 701 if (tb[IFLA_WEIGHT]) 702 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]); 703 704 if (tb[IFLA_OPERSTATE]) 705 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 706 707 if (tb[IFLA_LINKMODE]) { 708 write_lock_bh(&dev_base_lock); 709 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 710 write_unlock_bh(&dev_base_lock); 711 } 712 713 err = 0; 714 715errout_dev: 716 if (err < 0 && modified && net_ratelimit()) 717 printk(KERN_WARNING "A link change request failed with " 718 "some changes comitted already. Interface %s may " 719 "have been left with an inconsistent configuration, " 720 "please check.\n", dev->name); 721 722 if (send_addr_notify) 723 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 724 725 dev_put(dev); 726errout: 727 return err; 728} 729 730static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 731{ 732 struct ifinfomsg *ifm; 733 struct nlattr *tb[IFLA_MAX+1]; 734 struct net_device *dev = NULL; 735 struct sk_buff *nskb; 736 int err; 737 738 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 739 if (err < 0) 740 return err; 741 742 ifm = nlmsg_data(nlh); 743 if (ifm->ifi_index > 0) { 744 dev = dev_get_by_index(ifm->ifi_index); 745 if (dev == NULL) 746 return -ENODEV; 747 } else 748 return -EINVAL; 749 750 nskb = nlmsg_new(if_nlmsg_size(), GFP_KERNEL); 751 if (nskb == NULL) { 752 err = -ENOBUFS; 753 goto errout; 754 } 755 756 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 757 nlh->nlmsg_seq, 0, 0); 758 if (err < 0) { 759 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 760 WARN_ON(err == -EMSGSIZE); 761 kfree_skb(nskb); 762 goto errout; 763 } 764 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid); 765errout: 766 dev_put(dev); 767 768 return err; 769} 770 771static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 772{ 773 int idx; 774 int s_idx = cb->family; 775 776 if (s_idx == 0) 777 s_idx = 1; 778 for (idx=1; idx<NPROTO; idx++) { 779 int type = cb->nlh->nlmsg_type-RTM_BASE; 780 if (idx < s_idx || idx == PF_PACKET) 781 continue; 782 if (rtnl_msg_handlers[idx] == NULL || 783 rtnl_msg_handlers[idx][type].dumpit == NULL) 784 continue; 785 if (idx > s_idx) 786 memset(&cb->args[0], 0, sizeof(cb->args)); 787 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 788 break; 789 } 790 cb->family = idx; 791 792 return skb->len; 793} 794 795void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 796{ 797 struct sk_buff *skb; 798 int err = -ENOBUFS; 799 800 skb = nlmsg_new(if_nlmsg_size(), GFP_KERNEL); 801 if (skb == NULL) 802 goto errout; 803 804 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 805 if (err < 0) { 806 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 807 WARN_ON(err == -EMSGSIZE); 808 kfree_skb(skb); 809 goto errout; 810 } 811 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 812errout: 813 if (err < 0) 814 rtnl_set_sk_err(RTNLGRP_LINK, err); 815} 816 817/* Protected by RTNL sempahore. */ 818static struct rtattr **rta_buf; 819static int rtattr_max; 820 821/* Process one rtnetlink message. */ 822 823static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 824{ 825 rtnl_doit_func doit; 826 int sz_idx, kind; 827 int min_len; 828 int family; 829 int type; 830 int err; 831 832 type = nlh->nlmsg_type; 833 if (type > RTM_MAX) 834 return -EOPNOTSUPP; 835 836 type -= RTM_BASE; 837 838 /* All the messages must have at least 1 byte length */ 839 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 840 return 0; 841 842 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; 843 if (family >= NPROTO) 844 return -EAFNOSUPPORT; 845 846 sz_idx = type>>2; 847 kind = type&3; 848 849 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 850 return -EPERM; 851 852 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 853 rtnl_dumpit_func dumpit; 854 855 dumpit = rtnl_get_dumpit(family, type); 856 if (dumpit == NULL) 857 return -EOPNOTSUPP; 858 859 __rtnl_unlock(); 860 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 861 rtnl_lock(); 862 return err; 863 } 864 865 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 866 867 min_len = rtm_min[sz_idx]; 868 if (nlh->nlmsg_len < min_len) 869 return -EINVAL; 870 871 if (nlh->nlmsg_len > min_len) { 872 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 873 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); 874 875 while (RTA_OK(attr, attrlen)) { 876 unsigned flavor = attr->rta_type; 877 if (flavor) { 878 if (flavor > rta_max[sz_idx]) 879 return -EINVAL; 880 rta_buf[flavor-1] = attr; 881 } 882 attr = RTA_NEXT(attr, attrlen); 883 } 884 } 885 886 doit = rtnl_get_doit(family, type); 887 if (doit == NULL) 888 return -EOPNOTSUPP; 889 890 return doit(skb, nlh, (void *)&rta_buf[0]); 891} 892 893static void rtnetlink_rcv(struct sock *sk, int len) 894{ 895 unsigned int qlen = 0; 896 897 do { 898 mutex_lock(&rtnl_mutex); 899 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg); 900 mutex_unlock(&rtnl_mutex); 901 902 netdev_run_todo(); 903 } while (qlen); 904} 905 906static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 907{ 908 struct net_device *dev = ptr; 909 switch (event) { 910 case NETDEV_UNREGISTER: 911 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 912 break; 913 case NETDEV_REGISTER: 914 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 915 break; 916 case NETDEV_UP: 917 case NETDEV_DOWN: 918 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 919 break; 920 case NETDEV_CHANGE: 921 case NETDEV_GOING_DOWN: 922 break; 923 default: 924 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 925 break; 926 } 927 return NOTIFY_DONE; 928} 929 930static struct notifier_block rtnetlink_dev_notifier = { 931 .notifier_call = rtnetlink_event, 932}; 933 934void __init rtnetlink_init(void) 935{ 936 int i; 937 938 rtattr_max = 0; 939 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 940 if (rta_max[i] > rtattr_max) 941 rtattr_max = rta_max[i]; 942 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 943 if (!rta_buf) 944 panic("rtnetlink_init: cannot allocate rta_buf\n"); 945 946 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, 947 &rtnl_mutex, THIS_MODULE); 948 if (rtnl == NULL) 949 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 950 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 951 register_netdevice_notifier(&rtnetlink_dev_notifier); 952 953 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 954 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 955 956 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 957 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 958} 959 960EXPORT_SYMBOL(__rta_fill); 961EXPORT_SYMBOL(rtattr_strlcpy); 962EXPORT_SYMBOL(rtattr_parse); 963EXPORT_SYMBOL(rtnetlink_put_metrics); 964EXPORT_SYMBOL(rtnl_lock); 965EXPORT_SYMBOL(rtnl_trylock); 966EXPORT_SYMBOL(rtnl_unlock); 967EXPORT_SYMBOL(rtnl_unicast); 968EXPORT_SYMBOL(rtnl_notify); 969EXPORT_SYMBOL(rtnl_set_sk_err); 970