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 56 struct rtnl_link { 57 rtnl_doit_func doit; 58 rtnl_dumpit_func dumpit; 59 }; 60 61 static DEFINE_MUTEX(rtnl_mutex); 62 63 void rtnl_lock(void) 64 { 65 mutex_lock(&rtnl_mutex); 66 } 67 EXPORT_SYMBOL(rtnl_lock); 68 69 void __rtnl_unlock(void) 70 { 71 mutex_unlock(&rtnl_mutex); 72 } 73 74 void rtnl_unlock(void) 75 { 76 /* This fellow will unlock it for us. */ 77 netdev_run_todo(); 78 } 79 EXPORT_SYMBOL(rtnl_unlock); 80 81 int rtnl_trylock(void) 82 { 83 return mutex_trylock(&rtnl_mutex); 84 } 85 EXPORT_SYMBOL(rtnl_trylock); 86 87 int rtnl_is_locked(void) 88 { 89 return mutex_is_locked(&rtnl_mutex); 90 } 91 EXPORT_SYMBOL(rtnl_is_locked); 92 93 #ifdef CONFIG_PROVE_LOCKING 94 int lockdep_rtnl_is_held(void) 95 { 96 return lockdep_is_held(&rtnl_mutex); 97 } 98 EXPORT_SYMBOL(lockdep_rtnl_is_held); 99 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 100 101 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 102 103 static inline int rtm_msgindex(int msgtype) 104 { 105 int msgindex = msgtype - RTM_BASE; 106 107 /* 108 * msgindex < 0 implies someone tried to register a netlink 109 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 110 * the message type has not been added to linux/rtnetlink.h 111 */ 112 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 113 114 return msgindex; 115 } 116 117 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 118 { 119 struct rtnl_link *tab; 120 121 if (protocol <= RTNL_FAMILY_MAX) 122 tab = rtnl_msg_handlers[protocol]; 123 else 124 tab = NULL; 125 126 if (tab == NULL || tab[msgindex].doit == NULL) 127 tab = rtnl_msg_handlers[PF_UNSPEC]; 128 129 return tab ? tab[msgindex].doit : NULL; 130 } 131 132 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 133 { 134 struct rtnl_link *tab; 135 136 if (protocol <= RTNL_FAMILY_MAX) 137 tab = rtnl_msg_handlers[protocol]; 138 else 139 tab = NULL; 140 141 if (tab == NULL || tab[msgindex].dumpit == NULL) 142 tab = rtnl_msg_handlers[PF_UNSPEC]; 143 144 return tab ? tab[msgindex].dumpit : NULL; 145 } 146 147 /** 148 * __rtnl_register - Register a rtnetlink message type 149 * @protocol: Protocol family or PF_UNSPEC 150 * @msgtype: rtnetlink message type 151 * @doit: Function pointer called for each request message 152 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 153 * 154 * Registers the specified function pointers (at least one of them has 155 * to be non-NULL) to be called whenever a request message for the 156 * specified protocol family and message type is received. 157 * 158 * The special protocol family PF_UNSPEC may be used to define fallback 159 * function pointers for the case when no entry for the specific protocol 160 * family exists. 161 * 162 * Returns 0 on success or a negative error code. 163 */ 164 int __rtnl_register(int protocol, int msgtype, 165 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 166 { 167 struct rtnl_link *tab; 168 int msgindex; 169 170 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 171 msgindex = rtm_msgindex(msgtype); 172 173 tab = rtnl_msg_handlers[protocol]; 174 if (tab == NULL) { 175 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 176 if (tab == NULL) 177 return -ENOBUFS; 178 179 rtnl_msg_handlers[protocol] = tab; 180 } 181 182 if (doit) 183 tab[msgindex].doit = doit; 184 185 if (dumpit) 186 tab[msgindex].dumpit = dumpit; 187 188 return 0; 189 } 190 EXPORT_SYMBOL_GPL(__rtnl_register); 191 192 /** 193 * rtnl_register - Register a rtnetlink message type 194 * 195 * Identical to __rtnl_register() but panics on failure. This is useful 196 * as failure of this function is very unlikely, it can only happen due 197 * to lack of memory when allocating the chain to store all message 198 * handlers for a protocol. Meant for use in init functions where lack 199 * of memory implies no sense in continueing. 200 */ 201 void rtnl_register(int protocol, int msgtype, 202 rtnl_doit_func doit, rtnl_dumpit_func dumpit) 203 { 204 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) 205 panic("Unable to register rtnetlink message handler, " 206 "protocol = %d, message type = %d\n", 207 protocol, msgtype); 208 } 209 EXPORT_SYMBOL_GPL(rtnl_register); 210 211 /** 212 * rtnl_unregister - Unregister a rtnetlink message type 213 * @protocol: Protocol family or PF_UNSPEC 214 * @msgtype: rtnetlink message type 215 * 216 * Returns 0 on success or a negative error code. 217 */ 218 int rtnl_unregister(int protocol, int msgtype) 219 { 220 int msgindex; 221 222 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 223 msgindex = rtm_msgindex(msgtype); 224 225 if (rtnl_msg_handlers[protocol] == NULL) 226 return -ENOENT; 227 228 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 229 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 230 231 return 0; 232 } 233 EXPORT_SYMBOL_GPL(rtnl_unregister); 234 235 /** 236 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 237 * @protocol : Protocol family or PF_UNSPEC 238 * 239 * Identical to calling rtnl_unregster() for all registered message types 240 * of a certain protocol family. 241 */ 242 void rtnl_unregister_all(int protocol) 243 { 244 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 245 246 kfree(rtnl_msg_handlers[protocol]); 247 rtnl_msg_handlers[protocol] = NULL; 248 } 249 EXPORT_SYMBOL_GPL(rtnl_unregister_all); 250 251 static LIST_HEAD(link_ops); 252 253 /** 254 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 255 * @ops: struct rtnl_link_ops * to register 256 * 257 * The caller must hold the rtnl_mutex. This function should be used 258 * by drivers that create devices during module initialization. It 259 * must be called before registering the devices. 260 * 261 * Returns 0 on success or a negative error code. 262 */ 263 int __rtnl_link_register(struct rtnl_link_ops *ops) 264 { 265 if (!ops->dellink) 266 ops->dellink = unregister_netdevice_queue; 267 268 list_add_tail(&ops->list, &link_ops); 269 return 0; 270 } 271 EXPORT_SYMBOL_GPL(__rtnl_link_register); 272 273 /** 274 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 275 * @ops: struct rtnl_link_ops * to register 276 * 277 * Returns 0 on success or a negative error code. 278 */ 279 int rtnl_link_register(struct rtnl_link_ops *ops) 280 { 281 int err; 282 283 rtnl_lock(); 284 err = __rtnl_link_register(ops); 285 rtnl_unlock(); 286 return err; 287 } 288 EXPORT_SYMBOL_GPL(rtnl_link_register); 289 290 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 291 { 292 struct net_device *dev; 293 LIST_HEAD(list_kill); 294 295 for_each_netdev(net, dev) { 296 if (dev->rtnl_link_ops == ops) 297 ops->dellink(dev, &list_kill); 298 } 299 unregister_netdevice_many(&list_kill); 300 } 301 302 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 303 { 304 rtnl_lock(); 305 __rtnl_kill_links(net, ops); 306 rtnl_unlock(); 307 } 308 EXPORT_SYMBOL_GPL(rtnl_kill_links); 309 310 /** 311 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 312 * @ops: struct rtnl_link_ops * to unregister 313 * 314 * The caller must hold the rtnl_mutex. 315 */ 316 void __rtnl_link_unregister(struct rtnl_link_ops *ops) 317 { 318 struct net *net; 319 320 for_each_net(net) { 321 __rtnl_kill_links(net, ops); 322 } 323 list_del(&ops->list); 324 } 325 EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 326 327 /** 328 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 329 * @ops: struct rtnl_link_ops * to unregister 330 */ 331 void rtnl_link_unregister(struct rtnl_link_ops *ops) 332 { 333 rtnl_lock(); 334 __rtnl_link_unregister(ops); 335 rtnl_unlock(); 336 } 337 EXPORT_SYMBOL_GPL(rtnl_link_unregister); 338 339 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 340 { 341 const struct rtnl_link_ops *ops; 342 343 list_for_each_entry(ops, &link_ops, list) { 344 if (!strcmp(ops->kind, kind)) 345 return ops; 346 } 347 return NULL; 348 } 349 350 static size_t rtnl_link_get_size(const struct net_device *dev) 351 { 352 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 353 size_t size; 354 355 if (!ops) 356 return 0; 357 358 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 359 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 360 361 if (ops->get_size) 362 /* IFLA_INFO_DATA + nested data */ 363 size += nlmsg_total_size(sizeof(struct nlattr)) + 364 ops->get_size(dev); 365 366 if (ops->get_xstats_size) 367 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ 368 369 return size; 370 } 371 372 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 373 { 374 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 375 struct nlattr *linkinfo, *data; 376 int err = -EMSGSIZE; 377 378 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 379 if (linkinfo == NULL) 380 goto out; 381 382 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 383 goto err_cancel_link; 384 if (ops->fill_xstats) { 385 err = ops->fill_xstats(skb, dev); 386 if (err < 0) 387 goto err_cancel_link; 388 } 389 if (ops->fill_info) { 390 data = nla_nest_start(skb, IFLA_INFO_DATA); 391 if (data == NULL) 392 goto err_cancel_link; 393 err = ops->fill_info(skb, dev); 394 if (err < 0) 395 goto err_cancel_data; 396 nla_nest_end(skb, data); 397 } 398 399 nla_nest_end(skb, linkinfo); 400 return 0; 401 402 err_cancel_data: 403 nla_nest_cancel(skb, data); 404 err_cancel_link: 405 nla_nest_cancel(skb, linkinfo); 406 out: 407 return err; 408 } 409 410 static const int rtm_min[RTM_NR_FAMILIES] = 411 { 412 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 413 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 414 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 415 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 416 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 417 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 418 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 419 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 420 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 421 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 422 }; 423 424 static const int rta_max[RTM_NR_FAMILIES] = 425 { 426 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 427 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 428 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 429 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 430 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 431 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 432 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 433 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 434 }; 435 436 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 437 { 438 struct rtattr *rta; 439 int size = RTA_LENGTH(attrlen); 440 441 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); 442 rta->rta_type = attrtype; 443 rta->rta_len = size; 444 memcpy(RTA_DATA(rta), data, attrlen); 445 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 446 } 447 EXPORT_SYMBOL(__rta_fill); 448 449 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) 450 { 451 struct sock *rtnl = net->rtnl; 452 int err = 0; 453 454 NETLINK_CB(skb).dst_group = group; 455 if (echo) 456 atomic_inc(&skb->users); 457 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 458 if (echo) 459 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 460 return err; 461 } 462 463 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 464 { 465 struct sock *rtnl = net->rtnl; 466 467 return nlmsg_unicast(rtnl, skb, pid); 468 } 469 EXPORT_SYMBOL(rtnl_unicast); 470 471 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 472 struct nlmsghdr *nlh, gfp_t flags) 473 { 474 struct sock *rtnl = net->rtnl; 475 int report = 0; 476 477 if (nlh) 478 report = nlmsg_report(nlh); 479 480 nlmsg_notify(rtnl, skb, pid, group, report, flags); 481 } 482 EXPORT_SYMBOL(rtnl_notify); 483 484 void rtnl_set_sk_err(struct net *net, u32 group, int error) 485 { 486 struct sock *rtnl = net->rtnl; 487 488 netlink_set_err(rtnl, 0, group, error); 489 } 490 EXPORT_SYMBOL(rtnl_set_sk_err); 491 492 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 493 { 494 struct nlattr *mx; 495 int i, valid = 0; 496 497 mx = nla_nest_start(skb, RTA_METRICS); 498 if (mx == NULL) 499 return -ENOBUFS; 500 501 for (i = 0; i < RTAX_MAX; i++) { 502 if (metrics[i]) { 503 valid++; 504 NLA_PUT_U32(skb, i+1, metrics[i]); 505 } 506 } 507 508 if (!valid) { 509 nla_nest_cancel(skb, mx); 510 return 0; 511 } 512 513 return nla_nest_end(skb, mx); 514 515 nla_put_failure: 516 nla_nest_cancel(skb, mx); 517 return -EMSGSIZE; 518 } 519 EXPORT_SYMBOL(rtnetlink_put_metrics); 520 521 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 522 u32 ts, u32 tsage, long expires, u32 error) 523 { 524 struct rta_cacheinfo ci = { 525 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), 526 .rta_used = dst->__use, 527 .rta_clntref = atomic_read(&(dst->__refcnt)), 528 .rta_error = error, 529 .rta_id = id, 530 .rta_ts = ts, 531 .rta_tsage = tsage, 532 }; 533 534 if (expires) 535 ci.rta_expires = jiffies_to_clock_t(expires); 536 537 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 538 } 539 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 540 541 static void set_operstate(struct net_device *dev, unsigned char transition) 542 { 543 unsigned char operstate = dev->operstate; 544 545 switch (transition) { 546 case IF_OPER_UP: 547 if ((operstate == IF_OPER_DORMANT || 548 operstate == IF_OPER_UNKNOWN) && 549 !netif_dormant(dev)) 550 operstate = IF_OPER_UP; 551 break; 552 553 case IF_OPER_DORMANT: 554 if (operstate == IF_OPER_UP || 555 operstate == IF_OPER_UNKNOWN) 556 operstate = IF_OPER_DORMANT; 557 break; 558 } 559 560 if (dev->operstate != operstate) { 561 write_lock_bh(&dev_base_lock); 562 dev->operstate = operstate; 563 write_unlock_bh(&dev_base_lock); 564 netdev_state_change(dev); 565 } 566 } 567 568 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 569 const struct ifinfomsg *ifm) 570 { 571 unsigned int flags = ifm->ifi_flags; 572 573 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 574 if (ifm->ifi_change) 575 flags = (flags & ifm->ifi_change) | 576 (dev->flags & ~ifm->ifi_change); 577 578 return flags; 579 } 580 581 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 582 const struct rtnl_link_stats64 *b) 583 { 584 a->rx_packets = b->rx_packets; 585 a->tx_packets = b->tx_packets; 586 a->rx_bytes = b->rx_bytes; 587 a->tx_bytes = b->tx_bytes; 588 a->rx_errors = b->rx_errors; 589 a->tx_errors = b->tx_errors; 590 a->rx_dropped = b->rx_dropped; 591 a->tx_dropped = b->tx_dropped; 592 593 a->multicast = b->multicast; 594 a->collisions = b->collisions; 595 596 a->rx_length_errors = b->rx_length_errors; 597 a->rx_over_errors = b->rx_over_errors; 598 a->rx_crc_errors = b->rx_crc_errors; 599 a->rx_frame_errors = b->rx_frame_errors; 600 a->rx_fifo_errors = b->rx_fifo_errors; 601 a->rx_missed_errors = b->rx_missed_errors; 602 603 a->tx_aborted_errors = b->tx_aborted_errors; 604 a->tx_carrier_errors = b->tx_carrier_errors; 605 a->tx_fifo_errors = b->tx_fifo_errors; 606 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 607 a->tx_window_errors = b->tx_window_errors; 608 609 a->rx_compressed = b->rx_compressed; 610 a->tx_compressed = b->tx_compressed; 611 } 612 613 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 614 { 615 struct rtnl_link_stats64 a; 616 617 a.rx_packets = b->rx_packets; 618 a.tx_packets = b->tx_packets; 619 a.rx_bytes = b->rx_bytes; 620 a.tx_bytes = b->tx_bytes; 621 a.rx_errors = b->rx_errors; 622 a.tx_errors = b->tx_errors; 623 a.rx_dropped = b->rx_dropped; 624 a.tx_dropped = b->tx_dropped; 625 626 a.multicast = b->multicast; 627 a.collisions = b->collisions; 628 629 a.rx_length_errors = b->rx_length_errors; 630 a.rx_over_errors = b->rx_over_errors; 631 a.rx_crc_errors = b->rx_crc_errors; 632 a.rx_frame_errors = b->rx_frame_errors; 633 a.rx_fifo_errors = b->rx_fifo_errors; 634 a.rx_missed_errors = b->rx_missed_errors; 635 636 a.tx_aborted_errors = b->tx_aborted_errors; 637 a.tx_carrier_errors = b->tx_carrier_errors; 638 a.tx_fifo_errors = b->tx_fifo_errors; 639 a.tx_heartbeat_errors = b->tx_heartbeat_errors; 640 a.tx_window_errors = b->tx_window_errors; 641 642 a.rx_compressed = b->rx_compressed; 643 a.tx_compressed = b->tx_compressed; 644 memcpy(v, &a, sizeof(a)); 645 } 646 647 /* All VF info */ 648 static inline int rtnl_vfinfo_size(const struct net_device *dev) 649 { 650 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) { 651 652 int num_vfs = dev_num_vf(dev->dev.parent); 653 size_t size = nla_total_size(sizeof(struct nlattr)); 654 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 655 size += num_vfs * 656 (nla_total_size(sizeof(struct ifla_vf_mac)) + 657 nla_total_size(sizeof(struct ifla_vf_vlan)) + 658 nla_total_size(sizeof(struct ifla_vf_tx_rate))); 659 return size; 660 } else 661 return 0; 662 } 663 664 static size_t rtnl_port_size(const struct net_device *dev) 665 { 666 size_t port_size = nla_total_size(4) /* PORT_VF */ 667 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 668 + nla_total_size(sizeof(struct ifla_port_vsi)) 669 /* PORT_VSI_TYPE */ 670 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 671 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 672 + nla_total_size(1) /* PROT_VDP_REQUEST */ 673 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 674 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 675 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 676 + port_size; 677 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 678 + port_size; 679 680 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 681 return 0; 682 if (dev_num_vf(dev->dev.parent)) 683 return port_self_size + vf_ports_size + 684 vf_port_size * dev_num_vf(dev->dev.parent); 685 else 686 return port_self_size; 687 } 688 689 static noinline size_t if_nlmsg_size(const struct net_device *dev) 690 { 691 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 692 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 693 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 694 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 695 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 696 + nla_total_size(sizeof(struct rtnl_link_stats)) 697 + nla_total_size(sizeof(struct rtnl_link_stats64)) 698 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 699 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 700 + nla_total_size(4) /* IFLA_TXQLEN */ 701 + nla_total_size(4) /* IFLA_WEIGHT */ 702 + nla_total_size(4) /* IFLA_MTU */ 703 + nla_total_size(4) /* IFLA_LINK */ 704 + nla_total_size(4) /* IFLA_MASTER */ 705 + nla_total_size(1) /* IFLA_OPERSTATE */ 706 + nla_total_size(1) /* IFLA_LINKMODE */ 707 + nla_total_size(4) /* IFLA_NUM_VF */ 708 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */ 709 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 710 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ 711 } 712 713 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 714 { 715 struct nlattr *vf_ports; 716 struct nlattr *vf_port; 717 int vf; 718 int err; 719 720 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 721 if (!vf_ports) 722 return -EMSGSIZE; 723 724 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 725 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 726 if (!vf_port) 727 goto nla_put_failure; 728 NLA_PUT_U32(skb, IFLA_PORT_VF, vf); 729 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 730 if (err == -EMSGSIZE) 731 goto nla_put_failure; 732 if (err) { 733 nla_nest_cancel(skb, vf_port); 734 continue; 735 } 736 nla_nest_end(skb, vf_port); 737 } 738 739 nla_nest_end(skb, vf_ports); 740 741 return 0; 742 743 nla_put_failure: 744 nla_nest_cancel(skb, vf_ports); 745 return -EMSGSIZE; 746 } 747 748 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 749 { 750 struct nlattr *port_self; 751 int err; 752 753 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 754 if (!port_self) 755 return -EMSGSIZE; 756 757 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 758 if (err) { 759 nla_nest_cancel(skb, port_self); 760 return (err == -EMSGSIZE) ? err : 0; 761 } 762 763 nla_nest_end(skb, port_self); 764 765 return 0; 766 } 767 768 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 769 { 770 int err; 771 772 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 773 return 0; 774 775 err = rtnl_port_self_fill(skb, dev); 776 if (err) 777 return err; 778 779 if (dev_num_vf(dev->dev.parent)) { 780 err = rtnl_vf_ports_fill(skb, dev); 781 if (err) 782 return err; 783 } 784 785 return 0; 786 } 787 788 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 789 int type, u32 pid, u32 seq, u32 change, 790 unsigned int flags) 791 { 792 struct ifinfomsg *ifm; 793 struct nlmsghdr *nlh; 794 struct rtnl_link_stats64 temp; 795 const struct rtnl_link_stats64 *stats; 796 struct nlattr *attr; 797 798 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 799 if (nlh == NULL) 800 return -EMSGSIZE; 801 802 ifm = nlmsg_data(nlh); 803 ifm->ifi_family = AF_UNSPEC; 804 ifm->__ifi_pad = 0; 805 ifm->ifi_type = dev->type; 806 ifm->ifi_index = dev->ifindex; 807 ifm->ifi_flags = dev_get_flags(dev); 808 ifm->ifi_change = change; 809 810 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 811 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 812 NLA_PUT_U8(skb, IFLA_OPERSTATE, 813 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 814 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 815 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 816 817 if (dev->ifindex != dev->iflink) 818 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 819 820 if (dev->master) 821 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 822 823 if (dev->qdisc) 824 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); 825 826 if (dev->ifalias) 827 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); 828 829 if (1) { 830 struct rtnl_link_ifmap map = { 831 .mem_start = dev->mem_start, 832 .mem_end = dev->mem_end, 833 .base_addr = dev->base_addr, 834 .irq = dev->irq, 835 .dma = dev->dma, 836 .port = dev->if_port, 837 }; 838 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 839 } 840 841 if (dev->addr_len) { 842 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 843 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 844 } 845 846 attr = nla_reserve(skb, IFLA_STATS, 847 sizeof(struct rtnl_link_stats)); 848 if (attr == NULL) 849 goto nla_put_failure; 850 851 stats = dev_get_stats(dev, &temp); 852 copy_rtnl_link_stats(nla_data(attr), stats); 853 854 attr = nla_reserve(skb, IFLA_STATS64, 855 sizeof(struct rtnl_link_stats64)); 856 if (attr == NULL) 857 goto nla_put_failure; 858 copy_rtnl_link_stats64(nla_data(attr), stats); 859 860 if (dev->dev.parent) 861 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); 862 863 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) { 864 int i; 865 866 struct nlattr *vfinfo, *vf; 867 int num_vfs = dev_num_vf(dev->dev.parent); 868 869 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 870 if (!vfinfo) 871 goto nla_put_failure; 872 for (i = 0; i < num_vfs; i++) { 873 struct ifla_vf_info ivi; 874 struct ifla_vf_mac vf_mac; 875 struct ifla_vf_vlan vf_vlan; 876 struct ifla_vf_tx_rate vf_tx_rate; 877 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 878 break; 879 vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf; 880 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 881 vf_vlan.vlan = ivi.vlan; 882 vf_vlan.qos = ivi.qos; 883 vf_tx_rate.rate = ivi.tx_rate; 884 vf = nla_nest_start(skb, IFLA_VF_INFO); 885 if (!vf) { 886 nla_nest_cancel(skb, vfinfo); 887 goto nla_put_failure; 888 } 889 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac); 890 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan); 891 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate); 892 nla_nest_end(skb, vf); 893 } 894 nla_nest_end(skb, vfinfo); 895 } 896 897 if (rtnl_port_fill(skb, dev)) 898 goto nla_put_failure; 899 900 if (dev->rtnl_link_ops) { 901 if (rtnl_link_fill(skb, dev) < 0) 902 goto nla_put_failure; 903 } 904 905 return nlmsg_end(skb, nlh); 906 907 nla_put_failure: 908 nlmsg_cancel(skb, nlh); 909 return -EMSGSIZE; 910 } 911 912 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 913 { 914 struct net *net = sock_net(skb->sk); 915 int h, s_h; 916 int idx = 0, s_idx; 917 struct net_device *dev; 918 struct hlist_head *head; 919 struct hlist_node *node; 920 921 s_h = cb->args[0]; 922 s_idx = cb->args[1]; 923 924 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 925 idx = 0; 926 head = &net->dev_index_head[h]; 927 hlist_for_each_entry(dev, node, head, index_hlist) { 928 if (idx < s_idx) 929 goto cont; 930 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 931 NETLINK_CB(cb->skb).pid, 932 cb->nlh->nlmsg_seq, 0, 933 NLM_F_MULTI) <= 0) 934 goto out; 935 cont: 936 idx++; 937 } 938 } 939 out: 940 cb->args[1] = idx; 941 cb->args[0] = h; 942 943 return skb->len; 944 } 945 946 const struct nla_policy ifla_policy[IFLA_MAX+1] = { 947 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 948 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 949 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 950 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 951 [IFLA_MTU] = { .type = NLA_U32 }, 952 [IFLA_LINK] = { .type = NLA_U32 }, 953 [IFLA_TXQLEN] = { .type = NLA_U32 }, 954 [IFLA_WEIGHT] = { .type = NLA_U32 }, 955 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 956 [IFLA_LINKMODE] = { .type = NLA_U8 }, 957 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 958 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 959 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 960 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 961 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 962 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 963 }; 964 EXPORT_SYMBOL(ifla_policy); 965 966 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 967 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 968 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 969 }; 970 971 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 972 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 973 }; 974 975 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 976 [IFLA_VF_MAC] = { .type = NLA_BINARY, 977 .len = sizeof(struct ifla_vf_mac) }, 978 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 979 .len = sizeof(struct ifla_vf_vlan) }, 980 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 981 .len = sizeof(struct ifla_vf_tx_rate) }, 982 }; 983 984 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 985 [IFLA_PORT_VF] = { .type = NLA_U32 }, 986 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 987 .len = PORT_PROFILE_MAX }, 988 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 989 .len = sizeof(struct ifla_port_vsi)}, 990 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 991 .len = PORT_UUID_MAX }, 992 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 993 .len = PORT_UUID_MAX }, 994 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 995 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 996 }; 997 998 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 999 { 1000 struct net *net; 1001 /* Examine the link attributes and figure out which 1002 * network namespace we are talking about. 1003 */ 1004 if (tb[IFLA_NET_NS_PID]) 1005 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1006 else 1007 net = get_net(src_net); 1008 return net; 1009 } 1010 EXPORT_SYMBOL(rtnl_link_get_net); 1011 1012 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1013 { 1014 if (dev) { 1015 if (tb[IFLA_ADDRESS] && 1016 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1017 return -EINVAL; 1018 1019 if (tb[IFLA_BROADCAST] && 1020 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1021 return -EINVAL; 1022 } 1023 1024 return 0; 1025 } 1026 1027 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1028 { 1029 int rem, err = -EINVAL; 1030 struct nlattr *vf; 1031 const struct net_device_ops *ops = dev->netdev_ops; 1032 1033 nla_for_each_nested(vf, attr, rem) { 1034 switch (nla_type(vf)) { 1035 case IFLA_VF_MAC: { 1036 struct ifla_vf_mac *ivm; 1037 ivm = nla_data(vf); 1038 err = -EOPNOTSUPP; 1039 if (ops->ndo_set_vf_mac) 1040 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1041 ivm->mac); 1042 break; 1043 } 1044 case IFLA_VF_VLAN: { 1045 struct ifla_vf_vlan *ivv; 1046 ivv = nla_data(vf); 1047 err = -EOPNOTSUPP; 1048 if (ops->ndo_set_vf_vlan) 1049 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1050 ivv->vlan, 1051 ivv->qos); 1052 break; 1053 } 1054 case IFLA_VF_TX_RATE: { 1055 struct ifla_vf_tx_rate *ivt; 1056 ivt = nla_data(vf); 1057 err = -EOPNOTSUPP; 1058 if (ops->ndo_set_vf_tx_rate) 1059 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1060 ivt->rate); 1061 break; 1062 } 1063 default: 1064 err = -EINVAL; 1065 break; 1066 } 1067 if (err) 1068 break; 1069 } 1070 return err; 1071 } 1072 1073 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1074 struct nlattr **tb, char *ifname, int modified) 1075 { 1076 const struct net_device_ops *ops = dev->netdev_ops; 1077 int send_addr_notify = 0; 1078 int err; 1079 1080 if (tb[IFLA_NET_NS_PID]) { 1081 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1082 if (IS_ERR(net)) { 1083 err = PTR_ERR(net); 1084 goto errout; 1085 } 1086 err = dev_change_net_namespace(dev, net, ifname); 1087 put_net(net); 1088 if (err) 1089 goto errout; 1090 modified = 1; 1091 } 1092 1093 if (tb[IFLA_MAP]) { 1094 struct rtnl_link_ifmap *u_map; 1095 struct ifmap k_map; 1096 1097 if (!ops->ndo_set_config) { 1098 err = -EOPNOTSUPP; 1099 goto errout; 1100 } 1101 1102 if (!netif_device_present(dev)) { 1103 err = -ENODEV; 1104 goto errout; 1105 } 1106 1107 u_map = nla_data(tb[IFLA_MAP]); 1108 k_map.mem_start = (unsigned long) u_map->mem_start; 1109 k_map.mem_end = (unsigned long) u_map->mem_end; 1110 k_map.base_addr = (unsigned short) u_map->base_addr; 1111 k_map.irq = (unsigned char) u_map->irq; 1112 k_map.dma = (unsigned char) u_map->dma; 1113 k_map.port = (unsigned char) u_map->port; 1114 1115 err = ops->ndo_set_config(dev, &k_map); 1116 if (err < 0) 1117 goto errout; 1118 1119 modified = 1; 1120 } 1121 1122 if (tb[IFLA_ADDRESS]) { 1123 struct sockaddr *sa; 1124 int len; 1125 1126 if (!ops->ndo_set_mac_address) { 1127 err = -EOPNOTSUPP; 1128 goto errout; 1129 } 1130 1131 if (!netif_device_present(dev)) { 1132 err = -ENODEV; 1133 goto errout; 1134 } 1135 1136 len = sizeof(sa_family_t) + dev->addr_len; 1137 sa = kmalloc(len, GFP_KERNEL); 1138 if (!sa) { 1139 err = -ENOMEM; 1140 goto errout; 1141 } 1142 sa->sa_family = dev->type; 1143 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1144 dev->addr_len); 1145 err = ops->ndo_set_mac_address(dev, sa); 1146 kfree(sa); 1147 if (err) 1148 goto errout; 1149 send_addr_notify = 1; 1150 modified = 1; 1151 } 1152 1153 if (tb[IFLA_MTU]) { 1154 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1155 if (err < 0) 1156 goto errout; 1157 modified = 1; 1158 } 1159 1160 /* 1161 * Interface selected by interface index but interface 1162 * name provided implies that a name change has been 1163 * requested. 1164 */ 1165 if (ifm->ifi_index > 0 && ifname[0]) { 1166 err = dev_change_name(dev, ifname); 1167 if (err < 0) 1168 goto errout; 1169 modified = 1; 1170 } 1171 1172 if (tb[IFLA_IFALIAS]) { 1173 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1174 nla_len(tb[IFLA_IFALIAS])); 1175 if (err < 0) 1176 goto errout; 1177 modified = 1; 1178 } 1179 1180 if (tb[IFLA_BROADCAST]) { 1181 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1182 send_addr_notify = 1; 1183 } 1184 1185 if (ifm->ifi_flags || ifm->ifi_change) { 1186 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1187 if (err < 0) 1188 goto errout; 1189 } 1190 1191 if (tb[IFLA_TXQLEN]) 1192 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1193 1194 if (tb[IFLA_OPERSTATE]) 1195 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1196 1197 if (tb[IFLA_LINKMODE]) { 1198 write_lock_bh(&dev_base_lock); 1199 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1200 write_unlock_bh(&dev_base_lock); 1201 } 1202 1203 if (tb[IFLA_VFINFO_LIST]) { 1204 struct nlattr *attr; 1205 int rem; 1206 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1207 if (nla_type(attr) != IFLA_VF_INFO) { 1208 err = -EINVAL; 1209 goto errout; 1210 } 1211 err = do_setvfinfo(dev, attr); 1212 if (err < 0) 1213 goto errout; 1214 modified = 1; 1215 } 1216 } 1217 err = 0; 1218 1219 if (tb[IFLA_VF_PORTS]) { 1220 struct nlattr *port[IFLA_PORT_MAX+1]; 1221 struct nlattr *attr; 1222 int vf; 1223 int rem; 1224 1225 err = -EOPNOTSUPP; 1226 if (!ops->ndo_set_vf_port) 1227 goto errout; 1228 1229 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1230 if (nla_type(attr) != IFLA_VF_PORT) 1231 continue; 1232 err = nla_parse_nested(port, IFLA_PORT_MAX, 1233 attr, ifla_port_policy); 1234 if (err < 0) 1235 goto errout; 1236 if (!port[IFLA_PORT_VF]) { 1237 err = -EOPNOTSUPP; 1238 goto errout; 1239 } 1240 vf = nla_get_u32(port[IFLA_PORT_VF]); 1241 err = ops->ndo_set_vf_port(dev, vf, port); 1242 if (err < 0) 1243 goto errout; 1244 modified = 1; 1245 } 1246 } 1247 err = 0; 1248 1249 if (tb[IFLA_PORT_SELF]) { 1250 struct nlattr *port[IFLA_PORT_MAX+1]; 1251 1252 err = nla_parse_nested(port, IFLA_PORT_MAX, 1253 tb[IFLA_PORT_SELF], ifla_port_policy); 1254 if (err < 0) 1255 goto errout; 1256 1257 err = -EOPNOTSUPP; 1258 if (ops->ndo_set_vf_port) 1259 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1260 if (err < 0) 1261 goto errout; 1262 modified = 1; 1263 } 1264 err = 0; 1265 1266 errout: 1267 if (err < 0 && modified && net_ratelimit()) 1268 printk(KERN_WARNING "A link change request failed with " 1269 "some changes comitted already. Interface %s may " 1270 "have been left with an inconsistent configuration, " 1271 "please check.\n", dev->name); 1272 1273 if (send_addr_notify) 1274 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1275 return err; 1276 } 1277 1278 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1279 { 1280 struct net *net = sock_net(skb->sk); 1281 struct ifinfomsg *ifm; 1282 struct net_device *dev; 1283 int err; 1284 struct nlattr *tb[IFLA_MAX+1]; 1285 char ifname[IFNAMSIZ]; 1286 1287 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1288 if (err < 0) 1289 goto errout; 1290 1291 if (tb[IFLA_IFNAME]) 1292 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1293 else 1294 ifname[0] = '\0'; 1295 1296 err = -EINVAL; 1297 ifm = nlmsg_data(nlh); 1298 if (ifm->ifi_index > 0) 1299 dev = __dev_get_by_index(net, ifm->ifi_index); 1300 else if (tb[IFLA_IFNAME]) 1301 dev = __dev_get_by_name(net, ifname); 1302 else 1303 goto errout; 1304 1305 if (dev == NULL) { 1306 err = -ENODEV; 1307 goto errout; 1308 } 1309 1310 err = validate_linkmsg(dev, tb); 1311 if (err < 0) 1312 goto errout; 1313 1314 err = do_setlink(dev, ifm, tb, ifname, 0); 1315 errout: 1316 return err; 1317 } 1318 1319 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1320 { 1321 struct net *net = sock_net(skb->sk); 1322 const struct rtnl_link_ops *ops; 1323 struct net_device *dev; 1324 struct ifinfomsg *ifm; 1325 char ifname[IFNAMSIZ]; 1326 struct nlattr *tb[IFLA_MAX+1]; 1327 int err; 1328 1329 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1330 if (err < 0) 1331 return err; 1332 1333 if (tb[IFLA_IFNAME]) 1334 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1335 1336 ifm = nlmsg_data(nlh); 1337 if (ifm->ifi_index > 0) 1338 dev = __dev_get_by_index(net, ifm->ifi_index); 1339 else if (tb[IFLA_IFNAME]) 1340 dev = __dev_get_by_name(net, ifname); 1341 else 1342 return -EINVAL; 1343 1344 if (!dev) 1345 return -ENODEV; 1346 1347 ops = dev->rtnl_link_ops; 1348 if (!ops) 1349 return -EOPNOTSUPP; 1350 1351 ops->dellink(dev, NULL); 1352 return 0; 1353 } 1354 1355 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1356 { 1357 unsigned int old_flags; 1358 int err; 1359 1360 old_flags = dev->flags; 1361 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1362 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1363 if (err < 0) 1364 return err; 1365 } 1366 1367 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1368 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1369 1370 __dev_notify_flags(dev, old_flags); 1371 return 0; 1372 } 1373 EXPORT_SYMBOL(rtnl_configure_link); 1374 1375 struct net_device *rtnl_create_link(struct net *src_net, struct net *net, 1376 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1377 { 1378 int err; 1379 struct net_device *dev; 1380 unsigned int num_queues = 1; 1381 unsigned int real_num_queues = 1; 1382 1383 if (ops->get_tx_queues) { 1384 err = ops->get_tx_queues(src_net, tb, &num_queues, 1385 &real_num_queues); 1386 if (err) 1387 goto err; 1388 } 1389 err = -ENOMEM; 1390 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); 1391 if (!dev) 1392 goto err; 1393 1394 dev_net_set(dev, net); 1395 dev->rtnl_link_ops = ops; 1396 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1397 dev->real_num_tx_queues = real_num_queues; 1398 1399 if (strchr(dev->name, '%')) { 1400 err = dev_alloc_name(dev, dev->name); 1401 if (err < 0) 1402 goto err_free; 1403 } 1404 1405 if (tb[IFLA_MTU]) 1406 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1407 if (tb[IFLA_ADDRESS]) 1408 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1409 nla_len(tb[IFLA_ADDRESS])); 1410 if (tb[IFLA_BROADCAST]) 1411 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1412 nla_len(tb[IFLA_BROADCAST])); 1413 if (tb[IFLA_TXQLEN]) 1414 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1415 if (tb[IFLA_OPERSTATE]) 1416 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1417 if (tb[IFLA_LINKMODE]) 1418 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1419 1420 return dev; 1421 1422 err_free: 1423 free_netdev(dev); 1424 err: 1425 return ERR_PTR(err); 1426 } 1427 EXPORT_SYMBOL(rtnl_create_link); 1428 1429 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 1430 { 1431 struct net *net = sock_net(skb->sk); 1432 const struct rtnl_link_ops *ops; 1433 struct net_device *dev; 1434 struct ifinfomsg *ifm; 1435 char kind[MODULE_NAME_LEN]; 1436 char ifname[IFNAMSIZ]; 1437 struct nlattr *tb[IFLA_MAX+1]; 1438 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1439 int err; 1440 1441 #ifdef CONFIG_MODULES 1442 replay: 1443 #endif 1444 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1445 if (err < 0) 1446 return err; 1447 1448 if (tb[IFLA_IFNAME]) 1449 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1450 else 1451 ifname[0] = '\0'; 1452 1453 ifm = nlmsg_data(nlh); 1454 if (ifm->ifi_index > 0) 1455 dev = __dev_get_by_index(net, ifm->ifi_index); 1456 else if (ifname[0]) 1457 dev = __dev_get_by_name(net, ifname); 1458 else 1459 dev = NULL; 1460 1461 err = validate_linkmsg(dev, tb); 1462 if (err < 0) 1463 return err; 1464 1465 if (tb[IFLA_LINKINFO]) { 1466 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1467 tb[IFLA_LINKINFO], ifla_info_policy); 1468 if (err < 0) 1469 return err; 1470 } else 1471 memset(linkinfo, 0, sizeof(linkinfo)); 1472 1473 if (linkinfo[IFLA_INFO_KIND]) { 1474 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1475 ops = rtnl_link_ops_get(kind); 1476 } else { 1477 kind[0] = '\0'; 1478 ops = NULL; 1479 } 1480 1481 if (1) { 1482 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1483 struct net *dest_net; 1484 1485 if (ops) { 1486 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1487 err = nla_parse_nested(attr, ops->maxtype, 1488 linkinfo[IFLA_INFO_DATA], 1489 ops->policy); 1490 if (err < 0) 1491 return err; 1492 data = attr; 1493 } 1494 if (ops->validate) { 1495 err = ops->validate(tb, data); 1496 if (err < 0) 1497 return err; 1498 } 1499 } 1500 1501 if (dev) { 1502 int modified = 0; 1503 1504 if (nlh->nlmsg_flags & NLM_F_EXCL) 1505 return -EEXIST; 1506 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1507 return -EOPNOTSUPP; 1508 1509 if (linkinfo[IFLA_INFO_DATA]) { 1510 if (!ops || ops != dev->rtnl_link_ops || 1511 !ops->changelink) 1512 return -EOPNOTSUPP; 1513 1514 err = ops->changelink(dev, tb, data); 1515 if (err < 0) 1516 return err; 1517 modified = 1; 1518 } 1519 1520 return do_setlink(dev, ifm, tb, ifname, modified); 1521 } 1522 1523 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) 1524 return -ENODEV; 1525 1526 if (ifm->ifi_index) 1527 return -EOPNOTSUPP; 1528 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1529 return -EOPNOTSUPP; 1530 1531 if (!ops) { 1532 #ifdef CONFIG_MODULES 1533 if (kind[0]) { 1534 __rtnl_unlock(); 1535 request_module("rtnl-link-%s", kind); 1536 rtnl_lock(); 1537 ops = rtnl_link_ops_get(kind); 1538 if (ops) 1539 goto replay; 1540 } 1541 #endif 1542 return -EOPNOTSUPP; 1543 } 1544 1545 if (!ifname[0]) 1546 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1547 1548 dest_net = rtnl_link_get_net(net, tb); 1549 dev = rtnl_create_link(net, dest_net, ifname, ops, tb); 1550 1551 if (IS_ERR(dev)) 1552 err = PTR_ERR(dev); 1553 else if (ops->newlink) 1554 err = ops->newlink(net, dev, tb, data); 1555 else 1556 err = register_netdevice(dev); 1557 1558 if (err < 0 && !IS_ERR(dev)) 1559 free_netdev(dev); 1560 if (err < 0) 1561 goto out; 1562 1563 err = rtnl_configure_link(dev, ifm); 1564 if (err < 0) 1565 unregister_netdevice(dev); 1566 out: 1567 put_net(dest_net); 1568 return err; 1569 } 1570 } 1571 1572 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 1573 { 1574 struct net *net = sock_net(skb->sk); 1575 struct ifinfomsg *ifm; 1576 char ifname[IFNAMSIZ]; 1577 struct nlattr *tb[IFLA_MAX+1]; 1578 struct net_device *dev = NULL; 1579 struct sk_buff *nskb; 1580 int err; 1581 1582 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1583 if (err < 0) 1584 return err; 1585 1586 if (tb[IFLA_IFNAME]) 1587 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1588 1589 ifm = nlmsg_data(nlh); 1590 if (ifm->ifi_index > 0) 1591 dev = __dev_get_by_index(net, ifm->ifi_index); 1592 else if (tb[IFLA_IFNAME]) 1593 dev = __dev_get_by_name(net, ifname); 1594 else 1595 return -EINVAL; 1596 1597 if (dev == NULL) 1598 return -ENODEV; 1599 1600 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1601 if (nskb == NULL) 1602 return -ENOBUFS; 1603 1604 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, 1605 nlh->nlmsg_seq, 0, 0); 1606 if (err < 0) { 1607 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1608 WARN_ON(err == -EMSGSIZE); 1609 kfree_skb(nskb); 1610 } else 1611 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); 1612 1613 return err; 1614 } 1615 1616 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1617 { 1618 int idx; 1619 int s_idx = cb->family; 1620 1621 if (s_idx == 0) 1622 s_idx = 1; 1623 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1624 int type = cb->nlh->nlmsg_type-RTM_BASE; 1625 if (idx < s_idx || idx == PF_PACKET) 1626 continue; 1627 if (rtnl_msg_handlers[idx] == NULL || 1628 rtnl_msg_handlers[idx][type].dumpit == NULL) 1629 continue; 1630 if (idx > s_idx) 1631 memset(&cb->args[0], 0, sizeof(cb->args)); 1632 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1633 break; 1634 } 1635 cb->family = idx; 1636 1637 return skb->len; 1638 } 1639 1640 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 1641 { 1642 struct net *net = dev_net(dev); 1643 struct sk_buff *skb; 1644 int err = -ENOBUFS; 1645 1646 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); 1647 if (skb == NULL) 1648 goto errout; 1649 1650 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); 1651 if (err < 0) { 1652 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1653 WARN_ON(err == -EMSGSIZE); 1654 kfree_skb(skb); 1655 goto errout; 1656 } 1657 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1658 return; 1659 errout: 1660 if (err < 0) 1661 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1662 } 1663 1664 /* Protected by RTNL sempahore. */ 1665 static struct rtattr **rta_buf; 1666 static int rtattr_max; 1667 1668 /* Process one rtnetlink message. */ 1669 1670 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1671 { 1672 struct net *net = sock_net(skb->sk); 1673 rtnl_doit_func doit; 1674 int sz_idx, kind; 1675 int min_len; 1676 int family; 1677 int type; 1678 int err; 1679 1680 type = nlh->nlmsg_type; 1681 if (type > RTM_MAX) 1682 return -EOPNOTSUPP; 1683 1684 type -= RTM_BASE; 1685 1686 /* All the messages must have at least 1 byte length */ 1687 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 1688 return 0; 1689 1690 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; 1691 sz_idx = type>>2; 1692 kind = type&3; 1693 1694 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) 1695 return -EPERM; 1696 1697 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 1698 struct sock *rtnl; 1699 rtnl_dumpit_func dumpit; 1700 1701 dumpit = rtnl_get_dumpit(family, type); 1702 if (dumpit == NULL) 1703 return -EOPNOTSUPP; 1704 1705 __rtnl_unlock(); 1706 rtnl = net->rtnl; 1707 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); 1708 rtnl_lock(); 1709 return err; 1710 } 1711 1712 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 1713 1714 min_len = rtm_min[sz_idx]; 1715 if (nlh->nlmsg_len < min_len) 1716 return -EINVAL; 1717 1718 if (nlh->nlmsg_len > min_len) { 1719 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1720 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); 1721 1722 while (RTA_OK(attr, attrlen)) { 1723 unsigned flavor = attr->rta_type; 1724 if (flavor) { 1725 if (flavor > rta_max[sz_idx]) 1726 return -EINVAL; 1727 rta_buf[flavor-1] = attr; 1728 } 1729 attr = RTA_NEXT(attr, attrlen); 1730 } 1731 } 1732 1733 doit = rtnl_get_doit(family, type); 1734 if (doit == NULL) 1735 return -EOPNOTSUPP; 1736 1737 return doit(skb, nlh, (void *)&rta_buf[0]); 1738 } 1739 1740 static void rtnetlink_rcv(struct sk_buff *skb) 1741 { 1742 rtnl_lock(); 1743 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 1744 rtnl_unlock(); 1745 } 1746 1747 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 1748 { 1749 struct net_device *dev = ptr; 1750 1751 switch (event) { 1752 case NETDEV_UP: 1753 case NETDEV_DOWN: 1754 case NETDEV_PRE_UP: 1755 case NETDEV_POST_INIT: 1756 case NETDEV_REGISTER: 1757 case NETDEV_CHANGE: 1758 case NETDEV_PRE_TYPE_CHANGE: 1759 case NETDEV_GOING_DOWN: 1760 case NETDEV_UNREGISTER: 1761 case NETDEV_UNREGISTER_BATCH: 1762 break; 1763 default: 1764 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 1765 break; 1766 } 1767 return NOTIFY_DONE; 1768 } 1769 1770 static struct notifier_block rtnetlink_dev_notifier = { 1771 .notifier_call = rtnetlink_event, 1772 }; 1773 1774 1775 static int __net_init rtnetlink_net_init(struct net *net) 1776 { 1777 struct sock *sk; 1778 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, 1779 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); 1780 if (!sk) 1781 return -ENOMEM; 1782 net->rtnl = sk; 1783 return 0; 1784 } 1785 1786 static void __net_exit rtnetlink_net_exit(struct net *net) 1787 { 1788 netlink_kernel_release(net->rtnl); 1789 net->rtnl = NULL; 1790 } 1791 1792 static struct pernet_operations rtnetlink_net_ops = { 1793 .init = rtnetlink_net_init, 1794 .exit = rtnetlink_net_exit, 1795 }; 1796 1797 void __init rtnetlink_init(void) 1798 { 1799 int i; 1800 1801 rtattr_max = 0; 1802 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 1803 if (rta_max[i] > rtattr_max) 1804 rtattr_max = rta_max[i]; 1805 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 1806 if (!rta_buf) 1807 panic("rtnetlink_init: cannot allocate rta_buf\n"); 1808 1809 if (register_pernet_subsys(&rtnetlink_net_ops)) 1810 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 1811 1812 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 1813 register_netdevice_notifier(&rtnetlink_dev_notifier); 1814 1815 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); 1816 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); 1817 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); 1818 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); 1819 1820 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); 1821 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); 1822 } 1823 1824