rtnetlink.c revision 37fe0660981d7a1577409226f77554c2c5123e27
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/if_bridge.h> 39#include <linux/pci.h> 40#include <linux/etherdevice.h> 41 42#include <asm/uaccess.h> 43 44#include <linux/inet.h> 45#include <linux/netdevice.h> 46#include <net/ip.h> 47#include <net/protocol.h> 48#include <net/arp.h> 49#include <net/route.h> 50#include <net/udp.h> 51#include <net/sock.h> 52#include <net/pkt_sched.h> 53#include <net/fib_rules.h> 54#include <net/rtnetlink.h> 55#include <net/net_namespace.h> 56 57struct rtnl_link { 58 rtnl_doit_func doit; 59 rtnl_dumpit_func dumpit; 60 rtnl_calcit_func calcit; 61}; 62 63static DEFINE_MUTEX(rtnl_mutex); 64 65void rtnl_lock(void) 66{ 67 mutex_lock(&rtnl_mutex); 68} 69EXPORT_SYMBOL(rtnl_lock); 70 71void __rtnl_unlock(void) 72{ 73 mutex_unlock(&rtnl_mutex); 74} 75 76void rtnl_unlock(void) 77{ 78 /* This fellow will unlock it for us. */ 79 netdev_run_todo(); 80} 81EXPORT_SYMBOL(rtnl_unlock); 82 83int rtnl_trylock(void) 84{ 85 return mutex_trylock(&rtnl_mutex); 86} 87EXPORT_SYMBOL(rtnl_trylock); 88 89int rtnl_is_locked(void) 90{ 91 return mutex_is_locked(&rtnl_mutex); 92} 93EXPORT_SYMBOL(rtnl_is_locked); 94 95#ifdef CONFIG_PROVE_LOCKING 96int lockdep_rtnl_is_held(void) 97{ 98 return lockdep_is_held(&rtnl_mutex); 99} 100EXPORT_SYMBOL(lockdep_rtnl_is_held); 101#endif /* #ifdef CONFIG_PROVE_LOCKING */ 102 103static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1]; 104 105static inline int rtm_msgindex(int msgtype) 106{ 107 int msgindex = msgtype - RTM_BASE; 108 109 /* 110 * msgindex < 0 implies someone tried to register a netlink 111 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that 112 * the message type has not been added to linux/rtnetlink.h 113 */ 114 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); 115 116 return msgindex; 117} 118 119static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) 120{ 121 struct rtnl_link *tab; 122 123 if (protocol <= RTNL_FAMILY_MAX) 124 tab = rtnl_msg_handlers[protocol]; 125 else 126 tab = NULL; 127 128 if (tab == NULL || tab[msgindex].doit == NULL) 129 tab = rtnl_msg_handlers[PF_UNSPEC]; 130 131 return tab[msgindex].doit; 132} 133 134static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) 135{ 136 struct rtnl_link *tab; 137 138 if (protocol <= RTNL_FAMILY_MAX) 139 tab = rtnl_msg_handlers[protocol]; 140 else 141 tab = NULL; 142 143 if (tab == NULL || tab[msgindex].dumpit == NULL) 144 tab = rtnl_msg_handlers[PF_UNSPEC]; 145 146 return tab[msgindex].dumpit; 147} 148 149static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) 150{ 151 struct rtnl_link *tab; 152 153 if (protocol <= RTNL_FAMILY_MAX) 154 tab = rtnl_msg_handlers[protocol]; 155 else 156 tab = NULL; 157 158 if (tab == NULL || tab[msgindex].calcit == NULL) 159 tab = rtnl_msg_handlers[PF_UNSPEC]; 160 161 return tab[msgindex].calcit; 162} 163 164/** 165 * __rtnl_register - Register a rtnetlink message type 166 * @protocol: Protocol family or PF_UNSPEC 167 * @msgtype: rtnetlink message type 168 * @doit: Function pointer called for each request message 169 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message 170 * @calcit: Function pointer to calc size of dump message 171 * 172 * Registers the specified function pointers (at least one of them has 173 * to be non-NULL) to be called whenever a request message for the 174 * specified protocol family and message type is received. 175 * 176 * The special protocol family PF_UNSPEC may be used to define fallback 177 * function pointers for the case when no entry for the specific protocol 178 * family exists. 179 * 180 * Returns 0 on success or a negative error code. 181 */ 182int __rtnl_register(int protocol, int msgtype, 183 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 184 rtnl_calcit_func calcit) 185{ 186 struct rtnl_link *tab; 187 int msgindex; 188 189 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 190 msgindex = rtm_msgindex(msgtype); 191 192 tab = rtnl_msg_handlers[protocol]; 193 if (tab == NULL) { 194 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); 195 if (tab == NULL) 196 return -ENOBUFS; 197 198 rtnl_msg_handlers[protocol] = tab; 199 } 200 201 if (doit) 202 tab[msgindex].doit = doit; 203 204 if (dumpit) 205 tab[msgindex].dumpit = dumpit; 206 207 if (calcit) 208 tab[msgindex].calcit = calcit; 209 210 return 0; 211} 212EXPORT_SYMBOL_GPL(__rtnl_register); 213 214/** 215 * rtnl_register - Register a rtnetlink message type 216 * 217 * Identical to __rtnl_register() but panics on failure. This is useful 218 * as failure of this function is very unlikely, it can only happen due 219 * to lack of memory when allocating the chain to store all message 220 * handlers for a protocol. Meant for use in init functions where lack 221 * of memory implies no sense in continuing. 222 */ 223void rtnl_register(int protocol, int msgtype, 224 rtnl_doit_func doit, rtnl_dumpit_func dumpit, 225 rtnl_calcit_func calcit) 226{ 227 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0) 228 panic("Unable to register rtnetlink message handler, " 229 "protocol = %d, message type = %d\n", 230 protocol, msgtype); 231} 232EXPORT_SYMBOL_GPL(rtnl_register); 233 234/** 235 * rtnl_unregister - Unregister a rtnetlink message type 236 * @protocol: Protocol family or PF_UNSPEC 237 * @msgtype: rtnetlink message type 238 * 239 * Returns 0 on success or a negative error code. 240 */ 241int rtnl_unregister(int protocol, int msgtype) 242{ 243 int msgindex; 244 245 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 246 msgindex = rtm_msgindex(msgtype); 247 248 if (rtnl_msg_handlers[protocol] == NULL) 249 return -ENOENT; 250 251 rtnl_msg_handlers[protocol][msgindex].doit = NULL; 252 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; 253 254 return 0; 255} 256EXPORT_SYMBOL_GPL(rtnl_unregister); 257 258/** 259 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol 260 * @protocol : Protocol family or PF_UNSPEC 261 * 262 * Identical to calling rtnl_unregster() for all registered message types 263 * of a certain protocol family. 264 */ 265void rtnl_unregister_all(int protocol) 266{ 267 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX); 268 269 kfree(rtnl_msg_handlers[protocol]); 270 rtnl_msg_handlers[protocol] = NULL; 271} 272EXPORT_SYMBOL_GPL(rtnl_unregister_all); 273 274static LIST_HEAD(link_ops); 275 276static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) 277{ 278 const struct rtnl_link_ops *ops; 279 280 list_for_each_entry(ops, &link_ops, list) { 281 if (!strcmp(ops->kind, kind)) 282 return ops; 283 } 284 return NULL; 285} 286 287/** 288 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. 289 * @ops: struct rtnl_link_ops * to register 290 * 291 * The caller must hold the rtnl_mutex. This function should be used 292 * by drivers that create devices during module initialization. It 293 * must be called before registering the devices. 294 * 295 * Returns 0 on success or a negative error code. 296 */ 297int __rtnl_link_register(struct rtnl_link_ops *ops) 298{ 299 if (rtnl_link_ops_get(ops->kind)) 300 return -EEXIST; 301 302 if (!ops->dellink) 303 ops->dellink = unregister_netdevice_queue; 304 305 list_add_tail(&ops->list, &link_ops); 306 return 0; 307} 308EXPORT_SYMBOL_GPL(__rtnl_link_register); 309 310/** 311 * rtnl_link_register - Register rtnl_link_ops with rtnetlink. 312 * @ops: struct rtnl_link_ops * to register 313 * 314 * Returns 0 on success or a negative error code. 315 */ 316int rtnl_link_register(struct rtnl_link_ops *ops) 317{ 318 int err; 319 320 rtnl_lock(); 321 err = __rtnl_link_register(ops); 322 rtnl_unlock(); 323 return err; 324} 325EXPORT_SYMBOL_GPL(rtnl_link_register); 326 327static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) 328{ 329 struct net_device *dev; 330 LIST_HEAD(list_kill); 331 332 for_each_netdev(net, dev) { 333 if (dev->rtnl_link_ops == ops) 334 ops->dellink(dev, &list_kill); 335 } 336 unregister_netdevice_many(&list_kill); 337} 338 339/** 340 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 341 * @ops: struct rtnl_link_ops * to unregister 342 * 343 * The caller must hold the rtnl_mutex. 344 */ 345void __rtnl_link_unregister(struct rtnl_link_ops *ops) 346{ 347 struct net *net; 348 349 for_each_net(net) { 350 __rtnl_kill_links(net, ops); 351 } 352 list_del(&ops->list); 353} 354EXPORT_SYMBOL_GPL(__rtnl_link_unregister); 355 356/** 357 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. 358 * @ops: struct rtnl_link_ops * to unregister 359 */ 360void rtnl_link_unregister(struct rtnl_link_ops *ops) 361{ 362 rtnl_lock(); 363 __rtnl_link_unregister(ops); 364 rtnl_unlock(); 365} 366EXPORT_SYMBOL_GPL(rtnl_link_unregister); 367 368static size_t rtnl_link_get_size(const struct net_device *dev) 369{ 370 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 371 size_t size; 372 373 if (!ops) 374 return 0; 375 376 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ 377 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ 378 379 if (ops->get_size) 380 /* IFLA_INFO_DATA + nested data */ 381 size += nla_total_size(sizeof(struct nlattr)) + 382 ops->get_size(dev); 383 384 if (ops->get_xstats_size) 385 /* IFLA_INFO_XSTATS */ 386 size += nla_total_size(ops->get_xstats_size(dev)); 387 388 return size; 389} 390 391static LIST_HEAD(rtnl_af_ops); 392 393static const struct rtnl_af_ops *rtnl_af_lookup(const int family) 394{ 395 const struct rtnl_af_ops *ops; 396 397 list_for_each_entry(ops, &rtnl_af_ops, list) { 398 if (ops->family == family) 399 return ops; 400 } 401 402 return NULL; 403} 404 405/** 406 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink. 407 * @ops: struct rtnl_af_ops * to register 408 * 409 * The caller must hold the rtnl_mutex. 410 * 411 * Returns 0 on success or a negative error code. 412 */ 413int __rtnl_af_register(struct rtnl_af_ops *ops) 414{ 415 list_add_tail(&ops->list, &rtnl_af_ops); 416 return 0; 417} 418EXPORT_SYMBOL_GPL(__rtnl_af_register); 419 420/** 421 * rtnl_af_register - Register rtnl_af_ops with rtnetlink. 422 * @ops: struct rtnl_af_ops * to register 423 * 424 * Returns 0 on success or a negative error code. 425 */ 426int rtnl_af_register(struct rtnl_af_ops *ops) 427{ 428 int err; 429 430 rtnl_lock(); 431 err = __rtnl_af_register(ops); 432 rtnl_unlock(); 433 return err; 434} 435EXPORT_SYMBOL_GPL(rtnl_af_register); 436 437/** 438 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 439 * @ops: struct rtnl_af_ops * to unregister 440 * 441 * The caller must hold the rtnl_mutex. 442 */ 443void __rtnl_af_unregister(struct rtnl_af_ops *ops) 444{ 445 list_del(&ops->list); 446} 447EXPORT_SYMBOL_GPL(__rtnl_af_unregister); 448 449/** 450 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink. 451 * @ops: struct rtnl_af_ops * to unregister 452 */ 453void rtnl_af_unregister(struct rtnl_af_ops *ops) 454{ 455 rtnl_lock(); 456 __rtnl_af_unregister(ops); 457 rtnl_unlock(); 458} 459EXPORT_SYMBOL_GPL(rtnl_af_unregister); 460 461static size_t rtnl_link_get_af_size(const struct net_device *dev) 462{ 463 struct rtnl_af_ops *af_ops; 464 size_t size; 465 466 /* IFLA_AF_SPEC */ 467 size = nla_total_size(sizeof(struct nlattr)); 468 469 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 470 if (af_ops->get_link_af_size) { 471 /* AF_* + nested data */ 472 size += nla_total_size(sizeof(struct nlattr)) + 473 af_ops->get_link_af_size(dev); 474 } 475 } 476 477 return size; 478} 479 480static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) 481{ 482 const struct rtnl_link_ops *ops = dev->rtnl_link_ops; 483 struct nlattr *linkinfo, *data; 484 int err = -EMSGSIZE; 485 486 linkinfo = nla_nest_start(skb, IFLA_LINKINFO); 487 if (linkinfo == NULL) 488 goto out; 489 490 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) 491 goto err_cancel_link; 492 if (ops->fill_xstats) { 493 err = ops->fill_xstats(skb, dev); 494 if (err < 0) 495 goto err_cancel_link; 496 } 497 if (ops->fill_info) { 498 data = nla_nest_start(skb, IFLA_INFO_DATA); 499 if (data == NULL) { 500 err = -EMSGSIZE; 501 goto err_cancel_link; 502 } 503 err = ops->fill_info(skb, dev); 504 if (err < 0) 505 goto err_cancel_data; 506 nla_nest_end(skb, data); 507 } 508 509 nla_nest_end(skb, linkinfo); 510 return 0; 511 512err_cancel_data: 513 nla_nest_cancel(skb, data); 514err_cancel_link: 515 nla_nest_cancel(skb, linkinfo); 516out: 517 return err; 518} 519 520int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo) 521{ 522 struct sock *rtnl = net->rtnl; 523 int err = 0; 524 525 NETLINK_CB(skb).dst_group = group; 526 if (echo) 527 atomic_inc(&skb->users); 528 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 529 if (echo) 530 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 531 return err; 532} 533 534int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) 535{ 536 struct sock *rtnl = net->rtnl; 537 538 return nlmsg_unicast(rtnl, skb, pid); 539} 540EXPORT_SYMBOL(rtnl_unicast); 541 542void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, 543 struct nlmsghdr *nlh, gfp_t flags) 544{ 545 struct sock *rtnl = net->rtnl; 546 int report = 0; 547 548 if (nlh) 549 report = nlmsg_report(nlh); 550 551 nlmsg_notify(rtnl, skb, pid, group, report, flags); 552} 553EXPORT_SYMBOL(rtnl_notify); 554 555void rtnl_set_sk_err(struct net *net, u32 group, int error) 556{ 557 struct sock *rtnl = net->rtnl; 558 559 netlink_set_err(rtnl, 0, group, error); 560} 561EXPORT_SYMBOL(rtnl_set_sk_err); 562 563int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 564{ 565 struct nlattr *mx; 566 int i, valid = 0; 567 568 mx = nla_nest_start(skb, RTA_METRICS); 569 if (mx == NULL) 570 return -ENOBUFS; 571 572 for (i = 0; i < RTAX_MAX; i++) { 573 if (metrics[i]) { 574 valid++; 575 if (nla_put_u32(skb, i+1, metrics[i])) 576 goto nla_put_failure; 577 } 578 } 579 580 if (!valid) { 581 nla_nest_cancel(skb, mx); 582 return 0; 583 } 584 585 return nla_nest_end(skb, mx); 586 587nla_put_failure: 588 nla_nest_cancel(skb, mx); 589 return -EMSGSIZE; 590} 591EXPORT_SYMBOL(rtnetlink_put_metrics); 592 593int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, 594 long expires, u32 error) 595{ 596 struct rta_cacheinfo ci = { 597 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), 598 .rta_used = dst->__use, 599 .rta_clntref = atomic_read(&(dst->__refcnt)), 600 .rta_error = error, 601 .rta_id = id, 602 }; 603 604 if (expires) { 605 unsigned long clock; 606 607 clock = jiffies_to_clock_t(abs(expires)); 608 clock = min_t(unsigned long, clock, INT_MAX); 609 ci.rta_expires = (expires > 0) ? clock : -clock; 610 } 611 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); 612} 613EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); 614 615static void set_operstate(struct net_device *dev, unsigned char transition) 616{ 617 unsigned char operstate = dev->operstate; 618 619 switch (transition) { 620 case IF_OPER_UP: 621 if ((operstate == IF_OPER_DORMANT || 622 operstate == IF_OPER_UNKNOWN) && 623 !netif_dormant(dev)) 624 operstate = IF_OPER_UP; 625 break; 626 627 case IF_OPER_DORMANT: 628 if (operstate == IF_OPER_UP || 629 operstate == IF_OPER_UNKNOWN) 630 operstate = IF_OPER_DORMANT; 631 break; 632 } 633 634 if (dev->operstate != operstate) { 635 write_lock_bh(&dev_base_lock); 636 dev->operstate = operstate; 637 write_unlock_bh(&dev_base_lock); 638 netdev_state_change(dev); 639 } 640} 641 642static unsigned int rtnl_dev_get_flags(const struct net_device *dev) 643{ 644 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) | 645 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI)); 646} 647 648static unsigned int rtnl_dev_combine_flags(const struct net_device *dev, 649 const struct ifinfomsg *ifm) 650{ 651 unsigned int flags = ifm->ifi_flags; 652 653 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ 654 if (ifm->ifi_change) 655 flags = (flags & ifm->ifi_change) | 656 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change); 657 658 return flags; 659} 660 661static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 662 const struct rtnl_link_stats64 *b) 663{ 664 a->rx_packets = b->rx_packets; 665 a->tx_packets = b->tx_packets; 666 a->rx_bytes = b->rx_bytes; 667 a->tx_bytes = b->tx_bytes; 668 a->rx_errors = b->rx_errors; 669 a->tx_errors = b->tx_errors; 670 a->rx_dropped = b->rx_dropped; 671 a->tx_dropped = b->tx_dropped; 672 673 a->multicast = b->multicast; 674 a->collisions = b->collisions; 675 676 a->rx_length_errors = b->rx_length_errors; 677 a->rx_over_errors = b->rx_over_errors; 678 a->rx_crc_errors = b->rx_crc_errors; 679 a->rx_frame_errors = b->rx_frame_errors; 680 a->rx_fifo_errors = b->rx_fifo_errors; 681 a->rx_missed_errors = b->rx_missed_errors; 682 683 a->tx_aborted_errors = b->tx_aborted_errors; 684 a->tx_carrier_errors = b->tx_carrier_errors; 685 a->tx_fifo_errors = b->tx_fifo_errors; 686 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 687 a->tx_window_errors = b->tx_window_errors; 688 689 a->rx_compressed = b->rx_compressed; 690 a->tx_compressed = b->tx_compressed; 691} 692 693static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b) 694{ 695 memcpy(v, b, sizeof(*b)); 696} 697 698/* All VF info */ 699static inline int rtnl_vfinfo_size(const struct net_device *dev, 700 u32 ext_filter_mask) 701{ 702 if (dev->dev.parent && dev_is_pci(dev->dev.parent) && 703 (ext_filter_mask & RTEXT_FILTER_VF)) { 704 int num_vfs = dev_num_vf(dev->dev.parent); 705 size_t size = nla_total_size(sizeof(struct nlattr)); 706 size += nla_total_size(num_vfs * sizeof(struct nlattr)); 707 size += num_vfs * 708 (nla_total_size(sizeof(struct ifla_vf_mac)) + 709 nla_total_size(sizeof(struct ifla_vf_vlan)) + 710 nla_total_size(sizeof(struct ifla_vf_tx_rate)) + 711 nla_total_size(sizeof(struct ifla_vf_spoofchk))); 712 return size; 713 } else 714 return 0; 715} 716 717static size_t rtnl_port_size(const struct net_device *dev) 718{ 719 size_t port_size = nla_total_size(4) /* PORT_VF */ 720 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ 721 + nla_total_size(sizeof(struct ifla_port_vsi)) 722 /* PORT_VSI_TYPE */ 723 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ 724 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ 725 + nla_total_size(1) /* PROT_VDP_REQUEST */ 726 + nla_total_size(2); /* PORT_VDP_RESPONSE */ 727 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr)); 728 size_t vf_port_size = nla_total_size(sizeof(struct nlattr)) 729 + port_size; 730 size_t port_self_size = nla_total_size(sizeof(struct nlattr)) 731 + port_size; 732 733 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 734 return 0; 735 if (dev_num_vf(dev->dev.parent)) 736 return port_self_size + vf_ports_size + 737 vf_port_size * dev_num_vf(dev->dev.parent); 738 else 739 return port_self_size; 740} 741 742static noinline size_t if_nlmsg_size(const struct net_device *dev, 743 u32 ext_filter_mask) 744{ 745 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 746 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 747 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ 748 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ 749 + nla_total_size(sizeof(struct rtnl_link_ifmap)) 750 + nla_total_size(sizeof(struct rtnl_link_stats)) 751 + nla_total_size(sizeof(struct rtnl_link_stats64)) 752 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 753 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ 754 + nla_total_size(4) /* IFLA_TXQLEN */ 755 + nla_total_size(4) /* IFLA_WEIGHT */ 756 + nla_total_size(4) /* IFLA_MTU */ 757 + nla_total_size(4) /* IFLA_LINK */ 758 + nla_total_size(4) /* IFLA_MASTER */ 759 + nla_total_size(1) /* IFLA_CARRIER */ 760 + nla_total_size(4) /* IFLA_PROMISCUITY */ 761 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */ 762 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */ 763 + nla_total_size(1) /* IFLA_OPERSTATE */ 764 + nla_total_size(1) /* IFLA_LINKMODE */ 765 + nla_total_size(ext_filter_mask 766 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */ 767 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */ 768 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */ 769 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */ 770 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */ 771} 772 773static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev) 774{ 775 struct nlattr *vf_ports; 776 struct nlattr *vf_port; 777 int vf; 778 int err; 779 780 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS); 781 if (!vf_ports) 782 return -EMSGSIZE; 783 784 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) { 785 vf_port = nla_nest_start(skb, IFLA_VF_PORT); 786 if (!vf_port) 787 goto nla_put_failure; 788 if (nla_put_u32(skb, IFLA_PORT_VF, vf)) 789 goto nla_put_failure; 790 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb); 791 if (err == -EMSGSIZE) 792 goto nla_put_failure; 793 if (err) { 794 nla_nest_cancel(skb, vf_port); 795 continue; 796 } 797 nla_nest_end(skb, vf_port); 798 } 799 800 nla_nest_end(skb, vf_ports); 801 802 return 0; 803 804nla_put_failure: 805 nla_nest_cancel(skb, vf_ports); 806 return -EMSGSIZE; 807} 808 809static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev) 810{ 811 struct nlattr *port_self; 812 int err; 813 814 port_self = nla_nest_start(skb, IFLA_PORT_SELF); 815 if (!port_self) 816 return -EMSGSIZE; 817 818 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb); 819 if (err) { 820 nla_nest_cancel(skb, port_self); 821 return (err == -EMSGSIZE) ? err : 0; 822 } 823 824 nla_nest_end(skb, port_self); 825 826 return 0; 827} 828 829static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev) 830{ 831 int err; 832 833 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent) 834 return 0; 835 836 err = rtnl_port_self_fill(skb, dev); 837 if (err) 838 return err; 839 840 if (dev_num_vf(dev->dev.parent)) { 841 err = rtnl_vf_ports_fill(skb, dev); 842 if (err) 843 return err; 844 } 845 846 return 0; 847} 848 849static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 850 int type, u32 pid, u32 seq, u32 change, 851 unsigned int flags, u32 ext_filter_mask) 852{ 853 struct ifinfomsg *ifm; 854 struct nlmsghdr *nlh; 855 struct rtnl_link_stats64 temp; 856 const struct rtnl_link_stats64 *stats; 857 struct nlattr *attr, *af_spec; 858 struct rtnl_af_ops *af_ops; 859 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 860 861 ASSERT_RTNL(); 862 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 863 if (nlh == NULL) 864 return -EMSGSIZE; 865 866 ifm = nlmsg_data(nlh); 867 ifm->ifi_family = AF_UNSPEC; 868 ifm->__ifi_pad = 0; 869 ifm->ifi_type = dev->type; 870 ifm->ifi_index = dev->ifindex; 871 ifm->ifi_flags = dev_get_flags(dev); 872 ifm->ifi_change = change; 873 874 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 875 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) || 876 nla_put_u8(skb, IFLA_OPERSTATE, 877 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) || 878 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) || 879 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 880 nla_put_u32(skb, IFLA_GROUP, dev->group) || 881 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) || 882 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) || 883#ifdef CONFIG_RPS 884 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) || 885#endif 886 (dev->ifindex != dev->iflink && 887 nla_put_u32(skb, IFLA_LINK, dev->iflink)) || 888 (upper_dev && 889 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) || 890 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) || 891 (dev->qdisc && 892 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) || 893 (dev->ifalias && 894 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias))) 895 goto nla_put_failure; 896 897 if (1) { 898 struct rtnl_link_ifmap map = { 899 .mem_start = dev->mem_start, 900 .mem_end = dev->mem_end, 901 .base_addr = dev->base_addr, 902 .irq = dev->irq, 903 .dma = dev->dma, 904 .port = dev->if_port, 905 }; 906 if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) 907 goto nla_put_failure; 908 } 909 910 if (dev->addr_len) { 911 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) || 912 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast)) 913 goto nla_put_failure; 914 } 915 916 attr = nla_reserve(skb, IFLA_STATS, 917 sizeof(struct rtnl_link_stats)); 918 if (attr == NULL) 919 goto nla_put_failure; 920 921 stats = dev_get_stats(dev, &temp); 922 copy_rtnl_link_stats(nla_data(attr), stats); 923 924 attr = nla_reserve(skb, IFLA_STATS64, 925 sizeof(struct rtnl_link_stats64)); 926 if (attr == NULL) 927 goto nla_put_failure; 928 copy_rtnl_link_stats64(nla_data(attr), stats); 929 930 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) && 931 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent))) 932 goto nla_put_failure; 933 934 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent 935 && (ext_filter_mask & RTEXT_FILTER_VF)) { 936 int i; 937 938 struct nlattr *vfinfo, *vf; 939 int num_vfs = dev_num_vf(dev->dev.parent); 940 941 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST); 942 if (!vfinfo) 943 goto nla_put_failure; 944 for (i = 0; i < num_vfs; i++) { 945 struct ifla_vf_info ivi; 946 struct ifla_vf_mac vf_mac; 947 struct ifla_vf_vlan vf_vlan; 948 struct ifla_vf_tx_rate vf_tx_rate; 949 struct ifla_vf_spoofchk vf_spoofchk; 950 951 /* 952 * Not all SR-IOV capable drivers support the 953 * spoofcheck query. Preset to -1 so the user 954 * space tool can detect that the driver didn't 955 * report anything. 956 */ 957 ivi.spoofchk = -1; 958 memset(ivi.mac, 0, sizeof(ivi.mac)); 959 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) 960 break; 961 vf_mac.vf = 962 vf_vlan.vf = 963 vf_tx_rate.vf = 964 vf_spoofchk.vf = ivi.vf; 965 966 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac)); 967 vf_vlan.vlan = ivi.vlan; 968 vf_vlan.qos = ivi.qos; 969 vf_tx_rate.rate = ivi.tx_rate; 970 vf_spoofchk.setting = ivi.spoofchk; 971 vf = nla_nest_start(skb, IFLA_VF_INFO); 972 if (!vf) { 973 nla_nest_cancel(skb, vfinfo); 974 goto nla_put_failure; 975 } 976 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) || 977 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) || 978 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), 979 &vf_tx_rate) || 980 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk), 981 &vf_spoofchk)) 982 goto nla_put_failure; 983 nla_nest_end(skb, vf); 984 } 985 nla_nest_end(skb, vfinfo); 986 } 987 988 if (rtnl_port_fill(skb, dev)) 989 goto nla_put_failure; 990 991 if (dev->rtnl_link_ops) { 992 if (rtnl_link_fill(skb, dev) < 0) 993 goto nla_put_failure; 994 } 995 996 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC))) 997 goto nla_put_failure; 998 999 list_for_each_entry(af_ops, &rtnl_af_ops, list) { 1000 if (af_ops->fill_link_af) { 1001 struct nlattr *af; 1002 int err; 1003 1004 if (!(af = nla_nest_start(skb, af_ops->family))) 1005 goto nla_put_failure; 1006 1007 err = af_ops->fill_link_af(skb, dev); 1008 1009 /* 1010 * Caller may return ENODATA to indicate that there 1011 * was no data to be dumped. This is not an error, it 1012 * means we should trim the attribute header and 1013 * continue. 1014 */ 1015 if (err == -ENODATA) 1016 nla_nest_cancel(skb, af); 1017 else if (err < 0) 1018 goto nla_put_failure; 1019 1020 nla_nest_end(skb, af); 1021 } 1022 } 1023 1024 nla_nest_end(skb, af_spec); 1025 1026 return nlmsg_end(skb, nlh); 1027 1028nla_put_failure: 1029 nlmsg_cancel(skb, nlh); 1030 return -EMSGSIZE; 1031} 1032 1033static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 1034{ 1035 struct net *net = sock_net(skb->sk); 1036 int h, s_h; 1037 int idx = 0, s_idx; 1038 struct net_device *dev; 1039 struct hlist_head *head; 1040 struct nlattr *tb[IFLA_MAX+1]; 1041 u32 ext_filter_mask = 0; 1042 1043 s_h = cb->args[0]; 1044 s_idx = cb->args[1]; 1045 1046 rcu_read_lock(); 1047 cb->seq = net->dev_base_seq; 1048 1049 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 1050 ifla_policy) >= 0) { 1051 1052 if (tb[IFLA_EXT_MASK]) 1053 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1054 } 1055 1056 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1057 idx = 0; 1058 head = &net->dev_index_head[h]; 1059 hlist_for_each_entry_rcu(dev, head, index_hlist) { 1060 if (idx < s_idx) 1061 goto cont; 1062 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, 1063 NETLINK_CB(cb->skb).portid, 1064 cb->nlh->nlmsg_seq, 0, 1065 NLM_F_MULTI, 1066 ext_filter_mask) <= 0) 1067 goto out; 1068 1069 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1070cont: 1071 idx++; 1072 } 1073 } 1074out: 1075 rcu_read_unlock(); 1076 cb->args[1] = idx; 1077 cb->args[0] = h; 1078 1079 return skb->len; 1080} 1081 1082const struct nla_policy ifla_policy[IFLA_MAX+1] = { 1083 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, 1084 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1085 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1086 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, 1087 [IFLA_MTU] = { .type = NLA_U32 }, 1088 [IFLA_LINK] = { .type = NLA_U32 }, 1089 [IFLA_MASTER] = { .type = NLA_U32 }, 1090 [IFLA_CARRIER] = { .type = NLA_U8 }, 1091 [IFLA_TXQLEN] = { .type = NLA_U32 }, 1092 [IFLA_WEIGHT] = { .type = NLA_U32 }, 1093 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 1094 [IFLA_LINKMODE] = { .type = NLA_U8 }, 1095 [IFLA_LINKINFO] = { .type = NLA_NESTED }, 1096 [IFLA_NET_NS_PID] = { .type = NLA_U32 }, 1097 [IFLA_NET_NS_FD] = { .type = NLA_U32 }, 1098 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, 1099 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED }, 1100 [IFLA_VF_PORTS] = { .type = NLA_NESTED }, 1101 [IFLA_PORT_SELF] = { .type = NLA_NESTED }, 1102 [IFLA_AF_SPEC] = { .type = NLA_NESTED }, 1103 [IFLA_EXT_MASK] = { .type = NLA_U32 }, 1104 [IFLA_PROMISCUITY] = { .type = NLA_U32 }, 1105 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 }, 1106 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, 1107}; 1108EXPORT_SYMBOL(ifla_policy); 1109 1110static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { 1111 [IFLA_INFO_KIND] = { .type = NLA_STRING }, 1112 [IFLA_INFO_DATA] = { .type = NLA_NESTED }, 1113}; 1114 1115static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = { 1116 [IFLA_VF_INFO] = { .type = NLA_NESTED }, 1117}; 1118 1119static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = { 1120 [IFLA_VF_MAC] = { .type = NLA_BINARY, 1121 .len = sizeof(struct ifla_vf_mac) }, 1122 [IFLA_VF_VLAN] = { .type = NLA_BINARY, 1123 .len = sizeof(struct ifla_vf_vlan) }, 1124 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, 1125 .len = sizeof(struct ifla_vf_tx_rate) }, 1126 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY, 1127 .len = sizeof(struct ifla_vf_spoofchk) }, 1128}; 1129 1130static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { 1131 [IFLA_PORT_VF] = { .type = NLA_U32 }, 1132 [IFLA_PORT_PROFILE] = { .type = NLA_STRING, 1133 .len = PORT_PROFILE_MAX }, 1134 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, 1135 .len = sizeof(struct ifla_port_vsi)}, 1136 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, 1137 .len = PORT_UUID_MAX }, 1138 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, 1139 .len = PORT_UUID_MAX }, 1140 [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, 1141 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, 1142}; 1143 1144struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) 1145{ 1146 struct net *net; 1147 /* Examine the link attributes and figure out which 1148 * network namespace we are talking about. 1149 */ 1150 if (tb[IFLA_NET_NS_PID]) 1151 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); 1152 else if (tb[IFLA_NET_NS_FD]) 1153 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD])); 1154 else 1155 net = get_net(src_net); 1156 return net; 1157} 1158EXPORT_SYMBOL(rtnl_link_get_net); 1159 1160static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) 1161{ 1162 if (dev) { 1163 if (tb[IFLA_ADDRESS] && 1164 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 1165 return -EINVAL; 1166 1167 if (tb[IFLA_BROADCAST] && 1168 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 1169 return -EINVAL; 1170 } 1171 1172 if (tb[IFLA_AF_SPEC]) { 1173 struct nlattr *af; 1174 int rem, err; 1175 1176 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1177 const struct rtnl_af_ops *af_ops; 1178 1179 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1180 return -EAFNOSUPPORT; 1181 1182 if (!af_ops->set_link_af) 1183 return -EOPNOTSUPP; 1184 1185 if (af_ops->validate_link_af) { 1186 err = af_ops->validate_link_af(dev, af); 1187 if (err < 0) 1188 return err; 1189 } 1190 } 1191 } 1192 1193 return 0; 1194} 1195 1196static int do_setvfinfo(struct net_device *dev, struct nlattr *attr) 1197{ 1198 int rem, err = -EINVAL; 1199 struct nlattr *vf; 1200 const struct net_device_ops *ops = dev->netdev_ops; 1201 1202 nla_for_each_nested(vf, attr, rem) { 1203 switch (nla_type(vf)) { 1204 case IFLA_VF_MAC: { 1205 struct ifla_vf_mac *ivm; 1206 ivm = nla_data(vf); 1207 err = -EOPNOTSUPP; 1208 if (ops->ndo_set_vf_mac) 1209 err = ops->ndo_set_vf_mac(dev, ivm->vf, 1210 ivm->mac); 1211 break; 1212 } 1213 case IFLA_VF_VLAN: { 1214 struct ifla_vf_vlan *ivv; 1215 ivv = nla_data(vf); 1216 err = -EOPNOTSUPP; 1217 if (ops->ndo_set_vf_vlan) 1218 err = ops->ndo_set_vf_vlan(dev, ivv->vf, 1219 ivv->vlan, 1220 ivv->qos); 1221 break; 1222 } 1223 case IFLA_VF_TX_RATE: { 1224 struct ifla_vf_tx_rate *ivt; 1225 ivt = nla_data(vf); 1226 err = -EOPNOTSUPP; 1227 if (ops->ndo_set_vf_tx_rate) 1228 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, 1229 ivt->rate); 1230 break; 1231 } 1232 case IFLA_VF_SPOOFCHK: { 1233 struct ifla_vf_spoofchk *ivs; 1234 ivs = nla_data(vf); 1235 err = -EOPNOTSUPP; 1236 if (ops->ndo_set_vf_spoofchk) 1237 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf, 1238 ivs->setting); 1239 break; 1240 } 1241 default: 1242 err = -EINVAL; 1243 break; 1244 } 1245 if (err) 1246 break; 1247 } 1248 return err; 1249} 1250 1251static int do_set_master(struct net_device *dev, int ifindex) 1252{ 1253 struct net_device *upper_dev = netdev_master_upper_dev_get(dev); 1254 const struct net_device_ops *ops; 1255 int err; 1256 1257 if (upper_dev) { 1258 if (upper_dev->ifindex == ifindex) 1259 return 0; 1260 ops = upper_dev->netdev_ops; 1261 if (ops->ndo_del_slave) { 1262 err = ops->ndo_del_slave(upper_dev, dev); 1263 if (err) 1264 return err; 1265 } else { 1266 return -EOPNOTSUPP; 1267 } 1268 } 1269 1270 if (ifindex) { 1271 upper_dev = __dev_get_by_index(dev_net(dev), ifindex); 1272 if (!upper_dev) 1273 return -EINVAL; 1274 ops = upper_dev->netdev_ops; 1275 if (ops->ndo_add_slave) { 1276 err = ops->ndo_add_slave(upper_dev, dev); 1277 if (err) 1278 return err; 1279 } else { 1280 return -EOPNOTSUPP; 1281 } 1282 } 1283 return 0; 1284} 1285 1286static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, 1287 struct nlattr **tb, char *ifname, int modified) 1288{ 1289 const struct net_device_ops *ops = dev->netdev_ops; 1290 int err; 1291 1292 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) { 1293 struct net *net = rtnl_link_get_net(dev_net(dev), tb); 1294 if (IS_ERR(net)) { 1295 err = PTR_ERR(net); 1296 goto errout; 1297 } 1298 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) { 1299 err = -EPERM; 1300 goto errout; 1301 } 1302 err = dev_change_net_namespace(dev, net, ifname); 1303 put_net(net); 1304 if (err) 1305 goto errout; 1306 modified = 1; 1307 } 1308 1309 if (tb[IFLA_MAP]) { 1310 struct rtnl_link_ifmap *u_map; 1311 struct ifmap k_map; 1312 1313 if (!ops->ndo_set_config) { 1314 err = -EOPNOTSUPP; 1315 goto errout; 1316 } 1317 1318 if (!netif_device_present(dev)) { 1319 err = -ENODEV; 1320 goto errout; 1321 } 1322 1323 u_map = nla_data(tb[IFLA_MAP]); 1324 k_map.mem_start = (unsigned long) u_map->mem_start; 1325 k_map.mem_end = (unsigned long) u_map->mem_end; 1326 k_map.base_addr = (unsigned short) u_map->base_addr; 1327 k_map.irq = (unsigned char) u_map->irq; 1328 k_map.dma = (unsigned char) u_map->dma; 1329 k_map.port = (unsigned char) u_map->port; 1330 1331 err = ops->ndo_set_config(dev, &k_map); 1332 if (err < 0) 1333 goto errout; 1334 1335 modified = 1; 1336 } 1337 1338 if (tb[IFLA_ADDRESS]) { 1339 struct sockaddr *sa; 1340 int len; 1341 1342 len = sizeof(sa_family_t) + dev->addr_len; 1343 sa = kmalloc(len, GFP_KERNEL); 1344 if (!sa) { 1345 err = -ENOMEM; 1346 goto errout; 1347 } 1348 sa->sa_family = dev->type; 1349 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 1350 dev->addr_len); 1351 err = dev_set_mac_address(dev, sa); 1352 kfree(sa); 1353 if (err) 1354 goto errout; 1355 modified = 1; 1356 } 1357 1358 if (tb[IFLA_MTU]) { 1359 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1360 if (err < 0) 1361 goto errout; 1362 modified = 1; 1363 } 1364 1365 if (tb[IFLA_GROUP]) { 1366 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1367 modified = 1; 1368 } 1369 1370 /* 1371 * Interface selected by interface index but interface 1372 * name provided implies that a name change has been 1373 * requested. 1374 */ 1375 if (ifm->ifi_index > 0 && ifname[0]) { 1376 err = dev_change_name(dev, ifname); 1377 if (err < 0) 1378 goto errout; 1379 modified = 1; 1380 } 1381 1382 if (tb[IFLA_IFALIAS]) { 1383 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), 1384 nla_len(tb[IFLA_IFALIAS])); 1385 if (err < 0) 1386 goto errout; 1387 modified = 1; 1388 } 1389 1390 if (tb[IFLA_BROADCAST]) { 1391 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 1392 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 1393 } 1394 1395 if (ifm->ifi_flags || ifm->ifi_change) { 1396 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1397 if (err < 0) 1398 goto errout; 1399 } 1400 1401 if (tb[IFLA_MASTER]) { 1402 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER])); 1403 if (err) 1404 goto errout; 1405 modified = 1; 1406 } 1407 1408 if (tb[IFLA_CARRIER]) { 1409 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER])); 1410 if (err) 1411 goto errout; 1412 modified = 1; 1413 } 1414 1415 if (tb[IFLA_TXQLEN]) 1416 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1417 1418 if (tb[IFLA_OPERSTATE]) 1419 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1420 1421 if (tb[IFLA_LINKMODE]) { 1422 write_lock_bh(&dev_base_lock); 1423 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1424 write_unlock_bh(&dev_base_lock); 1425 } 1426 1427 if (tb[IFLA_VFINFO_LIST]) { 1428 struct nlattr *attr; 1429 int rem; 1430 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) { 1431 if (nla_type(attr) != IFLA_VF_INFO) { 1432 err = -EINVAL; 1433 goto errout; 1434 } 1435 err = do_setvfinfo(dev, attr); 1436 if (err < 0) 1437 goto errout; 1438 modified = 1; 1439 } 1440 } 1441 err = 0; 1442 1443 if (tb[IFLA_VF_PORTS]) { 1444 struct nlattr *port[IFLA_PORT_MAX+1]; 1445 struct nlattr *attr; 1446 int vf; 1447 int rem; 1448 1449 err = -EOPNOTSUPP; 1450 if (!ops->ndo_set_vf_port) 1451 goto errout; 1452 1453 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) { 1454 if (nla_type(attr) != IFLA_VF_PORT) 1455 continue; 1456 err = nla_parse_nested(port, IFLA_PORT_MAX, 1457 attr, ifla_port_policy); 1458 if (err < 0) 1459 goto errout; 1460 if (!port[IFLA_PORT_VF]) { 1461 err = -EOPNOTSUPP; 1462 goto errout; 1463 } 1464 vf = nla_get_u32(port[IFLA_PORT_VF]); 1465 err = ops->ndo_set_vf_port(dev, vf, port); 1466 if (err < 0) 1467 goto errout; 1468 modified = 1; 1469 } 1470 } 1471 err = 0; 1472 1473 if (tb[IFLA_PORT_SELF]) { 1474 struct nlattr *port[IFLA_PORT_MAX+1]; 1475 1476 err = nla_parse_nested(port, IFLA_PORT_MAX, 1477 tb[IFLA_PORT_SELF], ifla_port_policy); 1478 if (err < 0) 1479 goto errout; 1480 1481 err = -EOPNOTSUPP; 1482 if (ops->ndo_set_vf_port) 1483 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port); 1484 if (err < 0) 1485 goto errout; 1486 modified = 1; 1487 } 1488 1489 if (tb[IFLA_AF_SPEC]) { 1490 struct nlattr *af; 1491 int rem; 1492 1493 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) { 1494 const struct rtnl_af_ops *af_ops; 1495 1496 if (!(af_ops = rtnl_af_lookup(nla_type(af)))) 1497 BUG(); 1498 1499 err = af_ops->set_link_af(dev, af); 1500 if (err < 0) 1501 goto errout; 1502 1503 modified = 1; 1504 } 1505 } 1506 err = 0; 1507 1508errout: 1509 if (err < 0 && modified) 1510 net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n", 1511 dev->name); 1512 1513 return err; 1514} 1515 1516static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1517{ 1518 struct net *net = sock_net(skb->sk); 1519 struct ifinfomsg *ifm; 1520 struct net_device *dev; 1521 int err; 1522 struct nlattr *tb[IFLA_MAX+1]; 1523 char ifname[IFNAMSIZ]; 1524 1525 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1526 if (err < 0) 1527 goto errout; 1528 1529 if (tb[IFLA_IFNAME]) 1530 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1531 else 1532 ifname[0] = '\0'; 1533 1534 err = -EINVAL; 1535 ifm = nlmsg_data(nlh); 1536 if (ifm->ifi_index > 0) 1537 dev = __dev_get_by_index(net, ifm->ifi_index); 1538 else if (tb[IFLA_IFNAME]) 1539 dev = __dev_get_by_name(net, ifname); 1540 else 1541 goto errout; 1542 1543 if (dev == NULL) { 1544 err = -ENODEV; 1545 goto errout; 1546 } 1547 1548 err = validate_linkmsg(dev, tb); 1549 if (err < 0) 1550 goto errout; 1551 1552 err = do_setlink(dev, ifm, tb, ifname, 0); 1553errout: 1554 return err; 1555} 1556 1557static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 1558{ 1559 struct net *net = sock_net(skb->sk); 1560 const struct rtnl_link_ops *ops; 1561 struct net_device *dev; 1562 struct ifinfomsg *ifm; 1563 char ifname[IFNAMSIZ]; 1564 struct nlattr *tb[IFLA_MAX+1]; 1565 int err; 1566 LIST_HEAD(list_kill); 1567 1568 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1569 if (err < 0) 1570 return err; 1571 1572 if (tb[IFLA_IFNAME]) 1573 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1574 1575 ifm = nlmsg_data(nlh); 1576 if (ifm->ifi_index > 0) 1577 dev = __dev_get_by_index(net, ifm->ifi_index); 1578 else if (tb[IFLA_IFNAME]) 1579 dev = __dev_get_by_name(net, ifname); 1580 else 1581 return -EINVAL; 1582 1583 if (!dev) 1584 return -ENODEV; 1585 1586 ops = dev->rtnl_link_ops; 1587 if (!ops) 1588 return -EOPNOTSUPP; 1589 1590 ops->dellink(dev, &list_kill); 1591 unregister_netdevice_many(&list_kill); 1592 list_del(&list_kill); 1593 return 0; 1594} 1595 1596int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) 1597{ 1598 unsigned int old_flags; 1599 int err; 1600 1601 old_flags = dev->flags; 1602 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) { 1603 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm)); 1604 if (err < 0) 1605 return err; 1606 } 1607 1608 dev->rtnl_link_state = RTNL_LINK_INITIALIZED; 1609 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 1610 1611 __dev_notify_flags(dev, old_flags); 1612 return 0; 1613} 1614EXPORT_SYMBOL(rtnl_configure_link); 1615 1616struct net_device *rtnl_create_link(struct net *net, 1617 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) 1618{ 1619 int err; 1620 struct net_device *dev; 1621 unsigned int num_tx_queues = 1; 1622 unsigned int num_rx_queues = 1; 1623 1624 if (tb[IFLA_NUM_TX_QUEUES]) 1625 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); 1626 else if (ops->get_num_tx_queues) 1627 num_tx_queues = ops->get_num_tx_queues(); 1628 1629 if (tb[IFLA_NUM_RX_QUEUES]) 1630 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]); 1631 else if (ops->get_num_rx_queues) 1632 num_rx_queues = ops->get_num_rx_queues(); 1633 1634 err = -ENOMEM; 1635 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup, 1636 num_tx_queues, num_rx_queues); 1637 if (!dev) 1638 goto err; 1639 1640 dev_net_set(dev, net); 1641 dev->rtnl_link_ops = ops; 1642 dev->rtnl_link_state = RTNL_LINK_INITIALIZING; 1643 1644 if (tb[IFLA_MTU]) 1645 dev->mtu = nla_get_u32(tb[IFLA_MTU]); 1646 if (tb[IFLA_ADDRESS]) { 1647 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), 1648 nla_len(tb[IFLA_ADDRESS])); 1649 dev->addr_assign_type = NET_ADDR_SET; 1650 } 1651 if (tb[IFLA_BROADCAST]) 1652 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), 1653 nla_len(tb[IFLA_BROADCAST])); 1654 if (tb[IFLA_TXQLEN]) 1655 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 1656 if (tb[IFLA_OPERSTATE]) 1657 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 1658 if (tb[IFLA_LINKMODE]) 1659 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 1660 if (tb[IFLA_GROUP]) 1661 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP])); 1662 1663 return dev; 1664 1665err: 1666 return ERR_PTR(err); 1667} 1668EXPORT_SYMBOL(rtnl_create_link); 1669 1670static int rtnl_group_changelink(struct net *net, int group, 1671 struct ifinfomsg *ifm, 1672 struct nlattr **tb) 1673{ 1674 struct net_device *dev; 1675 int err; 1676 1677 for_each_netdev(net, dev) { 1678 if (dev->group == group) { 1679 err = do_setlink(dev, ifm, tb, NULL, 0); 1680 if (err < 0) 1681 return err; 1682 } 1683 } 1684 1685 return 0; 1686} 1687 1688static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh) 1689{ 1690 struct net *net = sock_net(skb->sk); 1691 const struct rtnl_link_ops *ops; 1692 struct net_device *dev; 1693 struct ifinfomsg *ifm; 1694 char kind[MODULE_NAME_LEN]; 1695 char ifname[IFNAMSIZ]; 1696 struct nlattr *tb[IFLA_MAX+1]; 1697 struct nlattr *linkinfo[IFLA_INFO_MAX+1]; 1698 int err; 1699 1700#ifdef CONFIG_MODULES 1701replay: 1702#endif 1703 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1704 if (err < 0) 1705 return err; 1706 1707 if (tb[IFLA_IFNAME]) 1708 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1709 else 1710 ifname[0] = '\0'; 1711 1712 ifm = nlmsg_data(nlh); 1713 if (ifm->ifi_index > 0) 1714 dev = __dev_get_by_index(net, ifm->ifi_index); 1715 else { 1716 if (ifname[0]) 1717 dev = __dev_get_by_name(net, ifname); 1718 else 1719 dev = NULL; 1720 } 1721 1722 err = validate_linkmsg(dev, tb); 1723 if (err < 0) 1724 return err; 1725 1726 if (tb[IFLA_LINKINFO]) { 1727 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, 1728 tb[IFLA_LINKINFO], ifla_info_policy); 1729 if (err < 0) 1730 return err; 1731 } else 1732 memset(linkinfo, 0, sizeof(linkinfo)); 1733 1734 if (linkinfo[IFLA_INFO_KIND]) { 1735 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); 1736 ops = rtnl_link_ops_get(kind); 1737 } else { 1738 kind[0] = '\0'; 1739 ops = NULL; 1740 } 1741 1742 if (1) { 1743 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; 1744 struct net *dest_net; 1745 1746 if (ops) { 1747 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { 1748 err = nla_parse_nested(attr, ops->maxtype, 1749 linkinfo[IFLA_INFO_DATA], 1750 ops->policy); 1751 if (err < 0) 1752 return err; 1753 data = attr; 1754 } 1755 if (ops->validate) { 1756 err = ops->validate(tb, data); 1757 if (err < 0) 1758 return err; 1759 } 1760 } 1761 1762 if (dev) { 1763 int modified = 0; 1764 1765 if (nlh->nlmsg_flags & NLM_F_EXCL) 1766 return -EEXIST; 1767 if (nlh->nlmsg_flags & NLM_F_REPLACE) 1768 return -EOPNOTSUPP; 1769 1770 if (linkinfo[IFLA_INFO_DATA]) { 1771 if (!ops || ops != dev->rtnl_link_ops || 1772 !ops->changelink) 1773 return -EOPNOTSUPP; 1774 1775 err = ops->changelink(dev, tb, data); 1776 if (err < 0) 1777 return err; 1778 modified = 1; 1779 } 1780 1781 return do_setlink(dev, ifm, tb, ifname, modified); 1782 } 1783 1784 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { 1785 if (ifm->ifi_index == 0 && tb[IFLA_GROUP]) 1786 return rtnl_group_changelink(net, 1787 nla_get_u32(tb[IFLA_GROUP]), 1788 ifm, tb); 1789 return -ENODEV; 1790 } 1791 1792 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) 1793 return -EOPNOTSUPP; 1794 1795 if (!ops) { 1796#ifdef CONFIG_MODULES 1797 if (kind[0]) { 1798 __rtnl_unlock(); 1799 request_module("rtnl-link-%s", kind); 1800 rtnl_lock(); 1801 ops = rtnl_link_ops_get(kind); 1802 if (ops) 1803 goto replay; 1804 } 1805#endif 1806 return -EOPNOTSUPP; 1807 } 1808 1809 if (!ifname[0]) 1810 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); 1811 1812 dest_net = rtnl_link_get_net(net, tb); 1813 if (IS_ERR(dest_net)) 1814 return PTR_ERR(dest_net); 1815 1816 dev = rtnl_create_link(dest_net, ifname, ops, tb); 1817 if (IS_ERR(dev)) { 1818 err = PTR_ERR(dev); 1819 goto out; 1820 } 1821 1822 dev->ifindex = ifm->ifi_index; 1823 1824 if (ops->newlink) 1825 err = ops->newlink(net, dev, tb, data); 1826 else 1827 err = register_netdevice(dev); 1828 1829 if (err < 0 && !IS_ERR(dev)) 1830 free_netdev(dev); 1831 if (err < 0) 1832 goto out; 1833 1834 err = rtnl_configure_link(dev, ifm); 1835 if (err < 0) 1836 unregister_netdevice(dev); 1837out: 1838 put_net(dest_net); 1839 return err; 1840 } 1841} 1842 1843static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh) 1844{ 1845 struct net *net = sock_net(skb->sk); 1846 struct ifinfomsg *ifm; 1847 char ifname[IFNAMSIZ]; 1848 struct nlattr *tb[IFLA_MAX+1]; 1849 struct net_device *dev = NULL; 1850 struct sk_buff *nskb; 1851 int err; 1852 u32 ext_filter_mask = 0; 1853 1854 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 1855 if (err < 0) 1856 return err; 1857 1858 if (tb[IFLA_IFNAME]) 1859 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); 1860 1861 if (tb[IFLA_EXT_MASK]) 1862 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1863 1864 ifm = nlmsg_data(nlh); 1865 if (ifm->ifi_index > 0) 1866 dev = __dev_get_by_index(net, ifm->ifi_index); 1867 else if (tb[IFLA_IFNAME]) 1868 dev = __dev_get_by_name(net, ifname); 1869 else 1870 return -EINVAL; 1871 1872 if (dev == NULL) 1873 return -ENODEV; 1874 1875 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); 1876 if (nskb == NULL) 1877 return -ENOBUFS; 1878 1879 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, 1880 nlh->nlmsg_seq, 0, 0, ext_filter_mask); 1881 if (err < 0) { 1882 /* -EMSGSIZE implies BUG in if_nlmsg_size */ 1883 WARN_ON(err == -EMSGSIZE); 1884 kfree_skb(nskb); 1885 } else 1886 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); 1887 1888 return err; 1889} 1890 1891static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh) 1892{ 1893 struct net *net = sock_net(skb->sk); 1894 struct net_device *dev; 1895 struct nlattr *tb[IFLA_MAX+1]; 1896 u32 ext_filter_mask = 0; 1897 u16 min_ifinfo_dump_size = 0; 1898 1899 if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX, 1900 ifla_policy) >= 0) { 1901 if (tb[IFLA_EXT_MASK]) 1902 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]); 1903 } 1904 1905 if (!ext_filter_mask) 1906 return NLMSG_GOODSIZE; 1907 /* 1908 * traverse the list of net devices and compute the minimum 1909 * buffer size based upon the filter mask. 1910 */ 1911 list_for_each_entry(dev, &net->dev_base_head, dev_list) { 1912 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size, 1913 if_nlmsg_size(dev, 1914 ext_filter_mask)); 1915 } 1916 1917 return min_ifinfo_dump_size; 1918} 1919 1920static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 1921{ 1922 int idx; 1923 int s_idx = cb->family; 1924 1925 if (s_idx == 0) 1926 s_idx = 1; 1927 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) { 1928 int type = cb->nlh->nlmsg_type-RTM_BASE; 1929 if (idx < s_idx || idx == PF_PACKET) 1930 continue; 1931 if (rtnl_msg_handlers[idx] == NULL || 1932 rtnl_msg_handlers[idx][type].dumpit == NULL) 1933 continue; 1934 if (idx > s_idx) { 1935 memset(&cb->args[0], 0, sizeof(cb->args)); 1936 cb->prev_seq = 0; 1937 cb->seq = 0; 1938 } 1939 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) 1940 break; 1941 } 1942 cb->family = idx; 1943 1944 return skb->len; 1945} 1946 1947void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change) 1948{ 1949 struct net *net = dev_net(dev); 1950 struct sk_buff *skb; 1951 int err = -ENOBUFS; 1952 size_t if_info_size; 1953 1954 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL); 1955 if (skb == NULL) 1956 goto errout; 1957 1958 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0); 1959 if (err < 0) { 1960 /* -EMSGSIZE implies BUG in if_nlmsg_size() */ 1961 WARN_ON(err == -EMSGSIZE); 1962 kfree_skb(skb); 1963 goto errout; 1964 } 1965 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); 1966 return; 1967errout: 1968 if (err < 0) 1969 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 1970} 1971EXPORT_SYMBOL(rtmsg_ifinfo); 1972 1973static int nlmsg_populate_fdb_fill(struct sk_buff *skb, 1974 struct net_device *dev, 1975 u8 *addr, u32 pid, u32 seq, 1976 int type, unsigned int flags) 1977{ 1978 struct nlmsghdr *nlh; 1979 struct ndmsg *ndm; 1980 1981 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI); 1982 if (!nlh) 1983 return -EMSGSIZE; 1984 1985 ndm = nlmsg_data(nlh); 1986 ndm->ndm_family = AF_BRIDGE; 1987 ndm->ndm_pad1 = 0; 1988 ndm->ndm_pad2 = 0; 1989 ndm->ndm_flags = flags; 1990 ndm->ndm_type = 0; 1991 ndm->ndm_ifindex = dev->ifindex; 1992 ndm->ndm_state = NUD_PERMANENT; 1993 1994 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr)) 1995 goto nla_put_failure; 1996 1997 return nlmsg_end(skb, nlh); 1998 1999nla_put_failure: 2000 nlmsg_cancel(skb, nlh); 2001 return -EMSGSIZE; 2002} 2003 2004static inline size_t rtnl_fdb_nlmsg_size(void) 2005{ 2006 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN); 2007} 2008 2009static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type) 2010{ 2011 struct net *net = dev_net(dev); 2012 struct sk_buff *skb; 2013 int err = -ENOBUFS; 2014 2015 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC); 2016 if (!skb) 2017 goto errout; 2018 2019 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF); 2020 if (err < 0) { 2021 kfree_skb(skb); 2022 goto errout; 2023 } 2024 2025 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 2026 return; 2027errout: 2028 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 2029} 2030 2031/** 2032 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry 2033 */ 2034int ndo_dflt_fdb_add(struct ndmsg *ndm, 2035 struct nlattr *tb[], 2036 struct net_device *dev, 2037 const unsigned char *addr, 2038 u16 flags) 2039{ 2040 int err = -EINVAL; 2041 2042 /* If aging addresses are supported device will need to 2043 * implement its own handler for this. 2044 */ 2045 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) { 2046 pr_info("%s: FDB only supports static addresses\n", dev->name); 2047 return err; 2048 } 2049 2050 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2051 err = dev_uc_add_excl(dev, addr); 2052 else if (is_multicast_ether_addr(addr)) 2053 err = dev_mc_add_excl(dev, addr); 2054 2055 /* Only return duplicate errors if NLM_F_EXCL is set */ 2056 if (err == -EEXIST && !(flags & NLM_F_EXCL)) 2057 err = 0; 2058 2059 return err; 2060} 2061EXPORT_SYMBOL(ndo_dflt_fdb_add); 2062 2063static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) 2064{ 2065 struct net *net = sock_net(skb->sk); 2066 struct ndmsg *ndm; 2067 struct nlattr *tb[NDA_MAX+1]; 2068 struct net_device *dev; 2069 u8 *addr; 2070 int err; 2071 2072 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2073 if (err < 0) 2074 return err; 2075 2076 ndm = nlmsg_data(nlh); 2077 if (ndm->ndm_ifindex == 0) { 2078 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n"); 2079 return -EINVAL; 2080 } 2081 2082 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2083 if (dev == NULL) { 2084 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n"); 2085 return -ENODEV; 2086 } 2087 2088 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2089 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n"); 2090 return -EINVAL; 2091 } 2092 2093 addr = nla_data(tb[NDA_LLADDR]); 2094 if (is_zero_ether_addr(addr)) { 2095 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n"); 2096 return -EINVAL; 2097 } 2098 2099 err = -EOPNOTSUPP; 2100 2101 /* Support fdb on master device the net/bridge default case */ 2102 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2103 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2104 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2105 const struct net_device_ops *ops = br_dev->netdev_ops; 2106 2107 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags); 2108 if (err) 2109 goto out; 2110 else 2111 ndm->ndm_flags &= ~NTF_MASTER; 2112 } 2113 2114 /* Embedded bridge, macvlan, and any other device support */ 2115 if ((ndm->ndm_flags & NTF_SELF)) { 2116 if (dev->netdev_ops->ndo_fdb_add) 2117 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr, 2118 nlh->nlmsg_flags); 2119 else 2120 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, 2121 nlh->nlmsg_flags); 2122 2123 if (!err) { 2124 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH); 2125 ndm->ndm_flags &= ~NTF_SELF; 2126 } 2127 } 2128out: 2129 return err; 2130} 2131 2132/** 2133 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry 2134 */ 2135int ndo_dflt_fdb_del(struct ndmsg *ndm, 2136 struct nlattr *tb[], 2137 struct net_device *dev, 2138 const unsigned char *addr) 2139{ 2140 int err = -EOPNOTSUPP; 2141 2142 /* If aging addresses are supported device will need to 2143 * implement its own handler for this. 2144 */ 2145 if (ndm->ndm_state & NUD_PERMANENT) { 2146 pr_info("%s: FDB only supports static addresses\n", dev->name); 2147 return -EINVAL; 2148 } 2149 2150 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) 2151 err = dev_uc_del(dev, addr); 2152 else if (is_multicast_ether_addr(addr)) 2153 err = dev_mc_del(dev, addr); 2154 else 2155 err = -EINVAL; 2156 2157 return err; 2158} 2159EXPORT_SYMBOL(ndo_dflt_fdb_del); 2160 2161static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) 2162{ 2163 struct net *net = sock_net(skb->sk); 2164 struct ndmsg *ndm; 2165 struct nlattr *tb[NDA_MAX+1]; 2166 struct net_device *dev; 2167 int err = -EINVAL; 2168 __u8 *addr; 2169 2170 if (!capable(CAP_NET_ADMIN)) 2171 return -EPERM; 2172 2173 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); 2174 if (err < 0) 2175 return err; 2176 2177 ndm = nlmsg_data(nlh); 2178 if (ndm->ndm_ifindex == 0) { 2179 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n"); 2180 return -EINVAL; 2181 } 2182 2183 dev = __dev_get_by_index(net, ndm->ndm_ifindex); 2184 if (dev == NULL) { 2185 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n"); 2186 return -ENODEV; 2187 } 2188 2189 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { 2190 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n"); 2191 return -EINVAL; 2192 } 2193 2194 addr = nla_data(tb[NDA_LLADDR]); 2195 if (is_zero_ether_addr(addr)) { 2196 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ether address\n"); 2197 return -EINVAL; 2198 } 2199 2200 err = -EOPNOTSUPP; 2201 2202 /* Support fdb on master device the net/bridge default case */ 2203 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && 2204 (dev->priv_flags & IFF_BRIDGE_PORT)) { 2205 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2206 const struct net_device_ops *ops = br_dev->netdev_ops; 2207 2208 if (ops->ndo_fdb_del) 2209 err = ops->ndo_fdb_del(ndm, tb, dev, addr); 2210 2211 if (err) 2212 goto out; 2213 else 2214 ndm->ndm_flags &= ~NTF_MASTER; 2215 } 2216 2217 /* Embedded bridge, macvlan, and any other device support */ 2218 if (ndm->ndm_flags & NTF_SELF) { 2219 if (dev->netdev_ops->ndo_fdb_del) 2220 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr); 2221 else 2222 err = ndo_dflt_fdb_del(ndm, tb, dev, addr); 2223 2224 if (!err) { 2225 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH); 2226 ndm->ndm_flags &= ~NTF_SELF; 2227 } 2228 } 2229out: 2230 return err; 2231} 2232 2233static int nlmsg_populate_fdb(struct sk_buff *skb, 2234 struct netlink_callback *cb, 2235 struct net_device *dev, 2236 int *idx, 2237 struct netdev_hw_addr_list *list) 2238{ 2239 struct netdev_hw_addr *ha; 2240 int err; 2241 u32 portid, seq; 2242 2243 portid = NETLINK_CB(cb->skb).portid; 2244 seq = cb->nlh->nlmsg_seq; 2245 2246 list_for_each_entry(ha, &list->list, list) { 2247 if (*idx < cb->args[0]) 2248 goto skip; 2249 2250 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 2251 portid, seq, 2252 RTM_NEWNEIGH, NTF_SELF); 2253 if (err < 0) 2254 return err; 2255skip: 2256 *idx += 1; 2257 } 2258 return 0; 2259} 2260 2261/** 2262 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table. 2263 * @nlh: netlink message header 2264 * @dev: netdevice 2265 * 2266 * Default netdevice operation to dump the existing unicast address list. 2267 * Returns number of addresses from list put in skb. 2268 */ 2269int ndo_dflt_fdb_dump(struct sk_buff *skb, 2270 struct netlink_callback *cb, 2271 struct net_device *dev, 2272 int idx) 2273{ 2274 int err; 2275 2276 netif_addr_lock_bh(dev); 2277 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc); 2278 if (err) 2279 goto out; 2280 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc); 2281out: 2282 netif_addr_unlock_bh(dev); 2283 return idx; 2284} 2285EXPORT_SYMBOL(ndo_dflt_fdb_dump); 2286 2287static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 2288{ 2289 int idx = 0; 2290 struct net *net = sock_net(skb->sk); 2291 struct net_device *dev; 2292 2293 rcu_read_lock(); 2294 for_each_netdev_rcu(net, dev) { 2295 if (dev->priv_flags & IFF_BRIDGE_PORT) { 2296 struct net_device *br_dev; 2297 const struct net_device_ops *ops; 2298 2299 br_dev = netdev_master_upper_dev_get(dev); 2300 ops = br_dev->netdev_ops; 2301 if (ops->ndo_fdb_dump) 2302 idx = ops->ndo_fdb_dump(skb, cb, dev, idx); 2303 } 2304 2305 if (dev->netdev_ops->ndo_fdb_dump) 2306 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx); 2307 else 2308 idx = ndo_dflt_fdb_dump(skb, cb, dev, idx); 2309 } 2310 rcu_read_unlock(); 2311 2312 cb->args[0] = idx; 2313 return skb->len; 2314} 2315 2316int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 2317 struct net_device *dev, u16 mode) 2318{ 2319 struct nlmsghdr *nlh; 2320 struct ifinfomsg *ifm; 2321 struct nlattr *br_afspec; 2322 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 2323 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2324 2325 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); 2326 if (nlh == NULL) 2327 return -EMSGSIZE; 2328 2329 ifm = nlmsg_data(nlh); 2330 ifm->ifi_family = AF_BRIDGE; 2331 ifm->__ifi_pad = 0; 2332 ifm->ifi_type = dev->type; 2333 ifm->ifi_index = dev->ifindex; 2334 ifm->ifi_flags = dev_get_flags(dev); 2335 ifm->ifi_change = 0; 2336 2337 2338 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 2339 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 2340 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 2341 (br_dev && 2342 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) || 2343 (dev->addr_len && 2344 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 2345 (dev->ifindex != dev->iflink && 2346 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 2347 goto nla_put_failure; 2348 2349 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); 2350 if (!br_afspec) 2351 goto nla_put_failure; 2352 2353 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) || 2354 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { 2355 nla_nest_cancel(skb, br_afspec); 2356 goto nla_put_failure; 2357 } 2358 nla_nest_end(skb, br_afspec); 2359 2360 return nlmsg_end(skb, nlh); 2361nla_put_failure: 2362 nlmsg_cancel(skb, nlh); 2363 return -EMSGSIZE; 2364} 2365EXPORT_SYMBOL(ndo_dflt_bridge_getlink); 2366 2367static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) 2368{ 2369 struct net *net = sock_net(skb->sk); 2370 struct net_device *dev; 2371 int idx = 0; 2372 u32 portid = NETLINK_CB(cb->skb).portid; 2373 u32 seq = cb->nlh->nlmsg_seq; 2374 struct nlattr *extfilt; 2375 u32 filter_mask = 0; 2376 2377 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct rtgenmsg), 2378 IFLA_EXT_MASK); 2379 if (extfilt) 2380 filter_mask = nla_get_u32(extfilt); 2381 2382 rcu_read_lock(); 2383 for_each_netdev_rcu(net, dev) { 2384 const struct net_device_ops *ops = dev->netdev_ops; 2385 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2386 2387 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2388 if (idx >= cb->args[0] && 2389 br_dev->netdev_ops->ndo_bridge_getlink( 2390 skb, portid, seq, dev, filter_mask) < 0) 2391 break; 2392 idx++; 2393 } 2394 2395 if (ops->ndo_bridge_getlink) { 2396 if (idx >= cb->args[0] && 2397 ops->ndo_bridge_getlink(skb, portid, seq, dev, 2398 filter_mask) < 0) 2399 break; 2400 idx++; 2401 } 2402 } 2403 rcu_read_unlock(); 2404 cb->args[0] = idx; 2405 2406 return skb->len; 2407} 2408 2409static inline size_t bridge_nlmsg_size(void) 2410{ 2411 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 2412 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 2413 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 2414 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ 2415 + nla_total_size(sizeof(u32)) /* IFLA_MTU */ 2416 + nla_total_size(sizeof(u32)) /* IFLA_LINK */ 2417 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ 2418 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ 2419 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ 2420 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ 2421 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ 2422} 2423 2424static int rtnl_bridge_notify(struct net_device *dev, u16 flags) 2425{ 2426 struct net *net = dev_net(dev); 2427 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2428 struct sk_buff *skb; 2429 int err = -EOPNOTSUPP; 2430 2431 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); 2432 if (!skb) { 2433 err = -ENOMEM; 2434 goto errout; 2435 } 2436 2437 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) && 2438 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) { 2439 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2440 if (err < 0) 2441 goto errout; 2442 } 2443 2444 if ((flags & BRIDGE_FLAGS_SELF) && 2445 dev->netdev_ops->ndo_bridge_getlink) { 2446 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0); 2447 if (err < 0) 2448 goto errout; 2449 } 2450 2451 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 2452 return 0; 2453errout: 2454 WARN_ON(err == -EMSGSIZE); 2455 kfree_skb(skb); 2456 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 2457 return err; 2458} 2459 2460static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh) 2461{ 2462 struct net *net = sock_net(skb->sk); 2463 struct ifinfomsg *ifm; 2464 struct net_device *dev; 2465 struct nlattr *br_spec, *attr = NULL; 2466 int rem, err = -EOPNOTSUPP; 2467 u16 oflags, flags = 0; 2468 bool have_flags = false; 2469 2470 if (nlmsg_len(nlh) < sizeof(*ifm)) 2471 return -EINVAL; 2472 2473 ifm = nlmsg_data(nlh); 2474 if (ifm->ifi_family != AF_BRIDGE) 2475 return -EPFNOSUPPORT; 2476 2477 dev = __dev_get_by_index(net, ifm->ifi_index); 2478 if (!dev) { 2479 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2480 return -ENODEV; 2481 } 2482 2483 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2484 if (br_spec) { 2485 nla_for_each_nested(attr, br_spec, rem) { 2486 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2487 have_flags = true; 2488 flags = nla_get_u16(attr); 2489 break; 2490 } 2491 } 2492 } 2493 2494 oflags = flags; 2495 2496 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2497 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2498 2499 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) { 2500 err = -EOPNOTSUPP; 2501 goto out; 2502 } 2503 2504 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2505 if (err) 2506 goto out; 2507 2508 flags &= ~BRIDGE_FLAGS_MASTER; 2509 } 2510 2511 if ((flags & BRIDGE_FLAGS_SELF)) { 2512 if (!dev->netdev_ops->ndo_bridge_setlink) 2513 err = -EOPNOTSUPP; 2514 else 2515 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh); 2516 2517 if (!err) 2518 flags &= ~BRIDGE_FLAGS_SELF; 2519 } 2520 2521 if (have_flags) 2522 memcpy(nla_data(attr), &flags, sizeof(flags)); 2523 /* Generate event to notify upper layer of bridge change */ 2524 if (!err) 2525 err = rtnl_bridge_notify(dev, oflags); 2526out: 2527 return err; 2528} 2529 2530static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh) 2531{ 2532 struct net *net = sock_net(skb->sk); 2533 struct ifinfomsg *ifm; 2534 struct net_device *dev; 2535 struct nlattr *br_spec, *attr = NULL; 2536 int rem, err = -EOPNOTSUPP; 2537 u16 oflags, flags = 0; 2538 bool have_flags = false; 2539 2540 if (nlmsg_len(nlh) < sizeof(*ifm)) 2541 return -EINVAL; 2542 2543 ifm = nlmsg_data(nlh); 2544 if (ifm->ifi_family != AF_BRIDGE) 2545 return -EPFNOSUPPORT; 2546 2547 dev = __dev_get_by_index(net, ifm->ifi_index); 2548 if (!dev) { 2549 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); 2550 return -ENODEV; 2551 } 2552 2553 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 2554 if (br_spec) { 2555 nla_for_each_nested(attr, br_spec, rem) { 2556 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { 2557 have_flags = true; 2558 flags = nla_get_u16(attr); 2559 break; 2560 } 2561 } 2562 } 2563 2564 oflags = flags; 2565 2566 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { 2567 struct net_device *br_dev = netdev_master_upper_dev_get(dev); 2568 2569 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) { 2570 err = -EOPNOTSUPP; 2571 goto out; 2572 } 2573 2574 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2575 if (err) 2576 goto out; 2577 2578 flags &= ~BRIDGE_FLAGS_MASTER; 2579 } 2580 2581 if ((flags & BRIDGE_FLAGS_SELF)) { 2582 if (!dev->netdev_ops->ndo_bridge_dellink) 2583 err = -EOPNOTSUPP; 2584 else 2585 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh); 2586 2587 if (!err) 2588 flags &= ~BRIDGE_FLAGS_SELF; 2589 } 2590 2591 if (have_flags) 2592 memcpy(nla_data(attr), &flags, sizeof(flags)); 2593 /* Generate event to notify upper layer of bridge change */ 2594 if (!err) 2595 err = rtnl_bridge_notify(dev, oflags); 2596out: 2597 return err; 2598} 2599 2600/* Process one rtnetlink message. */ 2601 2602static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2603{ 2604 struct net *net = sock_net(skb->sk); 2605 rtnl_doit_func doit; 2606 int sz_idx, kind; 2607 int family; 2608 int type; 2609 int err; 2610 2611 type = nlh->nlmsg_type; 2612 if (type > RTM_MAX) 2613 return -EOPNOTSUPP; 2614 2615 type -= RTM_BASE; 2616 2617 /* All the messages must have at least 1 byte length */ 2618 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg)) 2619 return 0; 2620 2621 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; 2622 sz_idx = type>>2; 2623 kind = type&3; 2624 2625 if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN)) 2626 return -EPERM; 2627 2628 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 2629 struct sock *rtnl; 2630 rtnl_dumpit_func dumpit; 2631 rtnl_calcit_func calcit; 2632 u16 min_dump_alloc = 0; 2633 2634 dumpit = rtnl_get_dumpit(family, type); 2635 if (dumpit == NULL) 2636 return -EOPNOTSUPP; 2637 calcit = rtnl_get_calcit(family, type); 2638 if (calcit) 2639 min_dump_alloc = calcit(skb, nlh); 2640 2641 __rtnl_unlock(); 2642 rtnl = net->rtnl; 2643 { 2644 struct netlink_dump_control c = { 2645 .dump = dumpit, 2646 .min_dump_alloc = min_dump_alloc, 2647 }; 2648 err = netlink_dump_start(rtnl, skb, nlh, &c); 2649 } 2650 rtnl_lock(); 2651 return err; 2652 } 2653 2654 doit = rtnl_get_doit(family, type); 2655 if (doit == NULL) 2656 return -EOPNOTSUPP; 2657 2658 return doit(skb, nlh); 2659} 2660 2661static void rtnetlink_rcv(struct sk_buff *skb) 2662{ 2663 rtnl_lock(); 2664 netlink_rcv_skb(skb, &rtnetlink_rcv_msg); 2665 rtnl_unlock(); 2666} 2667 2668static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 2669{ 2670 struct net_device *dev = ptr; 2671 2672 switch (event) { 2673 case NETDEV_UP: 2674 case NETDEV_DOWN: 2675 case NETDEV_PRE_UP: 2676 case NETDEV_POST_INIT: 2677 case NETDEV_REGISTER: 2678 case NETDEV_CHANGE: 2679 case NETDEV_PRE_TYPE_CHANGE: 2680 case NETDEV_GOING_DOWN: 2681 case NETDEV_UNREGISTER: 2682 case NETDEV_UNREGISTER_FINAL: 2683 case NETDEV_RELEASE: 2684 case NETDEV_JOIN: 2685 break; 2686 default: 2687 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 2688 break; 2689 } 2690 return NOTIFY_DONE; 2691} 2692 2693static struct notifier_block rtnetlink_dev_notifier = { 2694 .notifier_call = rtnetlink_event, 2695}; 2696 2697 2698static int __net_init rtnetlink_net_init(struct net *net) 2699{ 2700 struct sock *sk; 2701 struct netlink_kernel_cfg cfg = { 2702 .groups = RTNLGRP_MAX, 2703 .input = rtnetlink_rcv, 2704 .cb_mutex = &rtnl_mutex, 2705 .flags = NL_CFG_F_NONROOT_RECV, 2706 }; 2707 2708 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); 2709 if (!sk) 2710 return -ENOMEM; 2711 net->rtnl = sk; 2712 return 0; 2713} 2714 2715static void __net_exit rtnetlink_net_exit(struct net *net) 2716{ 2717 netlink_kernel_release(net->rtnl); 2718 net->rtnl = NULL; 2719} 2720 2721static struct pernet_operations rtnetlink_net_ops = { 2722 .init = rtnetlink_net_init, 2723 .exit = rtnetlink_net_exit, 2724}; 2725 2726void __init rtnetlink_init(void) 2727{ 2728 if (register_pernet_subsys(&rtnetlink_net_ops)) 2729 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 2730 2731 register_netdevice_notifier(&rtnetlink_dev_notifier); 2732 2733 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, 2734 rtnl_dump_ifinfo, rtnl_calcit); 2735 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL); 2736 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL); 2737 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL); 2738 2739 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL); 2740 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL); 2741 2742 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); 2743 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); 2744 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); 2745 2746 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); 2747 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL); 2748 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); 2749} 2750 2751