rtnetlink.c 44 KB

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  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. #include <linux/errno.h>
  19. #include <linux/module.h>
  20. #include <linux/types.h>
  21. #include <linux/socket.h>
  22. #include <linux/kernel.h>
  23. #include <linux/timer.h>
  24. #include <linux/string.h>
  25. #include <linux/sockios.h>
  26. #include <linux/net.h>
  27. #include <linux/fcntl.h>
  28. #include <linux/mm.h>
  29. #include <linux/slab.h>
  30. #include <linux/interrupt.h>
  31. #include <linux/capability.h>
  32. #include <linux/skbuff.h>
  33. #include <linux/init.h>
  34. #include <linux/security.h>
  35. #include <linux/mutex.h>
  36. #include <linux/if_addr.h>
  37. #include <linux/pci.h>
  38. #include <asm/uaccess.h>
  39. #include <asm/system.h>
  40. #include <linux/inet.h>
  41. #include <linux/netdevice.h>
  42. #include <net/ip.h>
  43. #include <net/protocol.h>
  44. #include <net/arp.h>
  45. #include <net/route.h>
  46. #include <net/udp.h>
  47. #include <net/sock.h>
  48. #include <net/pkt_sched.h>
  49. #include <net/fib_rules.h>
  50. #include <net/rtnetlink.h>
  51. #include <net/net_namespace.h>
  52. struct rtnl_link {
  53. rtnl_doit_func doit;
  54. rtnl_dumpit_func dumpit;
  55. };
  56. static DEFINE_MUTEX(rtnl_mutex);
  57. void rtnl_lock(void)
  58. {
  59. mutex_lock(&rtnl_mutex);
  60. }
  61. EXPORT_SYMBOL(rtnl_lock);
  62. void __rtnl_unlock(void)
  63. {
  64. mutex_unlock(&rtnl_mutex);
  65. }
  66. void rtnl_unlock(void)
  67. {
  68. /* This fellow will unlock it for us. */
  69. netdev_run_todo();
  70. }
  71. EXPORT_SYMBOL(rtnl_unlock);
  72. int rtnl_trylock(void)
  73. {
  74. return mutex_trylock(&rtnl_mutex);
  75. }
  76. EXPORT_SYMBOL(rtnl_trylock);
  77. int rtnl_is_locked(void)
  78. {
  79. return mutex_is_locked(&rtnl_mutex);
  80. }
  81. EXPORT_SYMBOL(rtnl_is_locked);
  82. #ifdef CONFIG_PROVE_LOCKING
  83. int lockdep_rtnl_is_held(void)
  84. {
  85. return lockdep_is_held(&rtnl_mutex);
  86. }
  87. EXPORT_SYMBOL(lockdep_rtnl_is_held);
  88. #endif /* #ifdef CONFIG_PROVE_LOCKING */
  89. static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
  90. static inline int rtm_msgindex(int msgtype)
  91. {
  92. int msgindex = msgtype - RTM_BASE;
  93. /*
  94. * msgindex < 0 implies someone tried to register a netlink
  95. * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
  96. * the message type has not been added to linux/rtnetlink.h
  97. */
  98. BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
  99. return msgindex;
  100. }
  101. static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
  102. {
  103. struct rtnl_link *tab;
  104. if (protocol <= RTNL_FAMILY_MAX)
  105. tab = rtnl_msg_handlers[protocol];
  106. else
  107. tab = NULL;
  108. if (tab == NULL || tab[msgindex].doit == NULL)
  109. tab = rtnl_msg_handlers[PF_UNSPEC];
  110. return tab ? tab[msgindex].doit : NULL;
  111. }
  112. static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
  113. {
  114. struct rtnl_link *tab;
  115. if (protocol <= RTNL_FAMILY_MAX)
  116. tab = rtnl_msg_handlers[protocol];
  117. else
  118. tab = NULL;
  119. if (tab == NULL || tab[msgindex].dumpit == NULL)
  120. tab = rtnl_msg_handlers[PF_UNSPEC];
  121. return tab ? tab[msgindex].dumpit : NULL;
  122. }
  123. /**
  124. * __rtnl_register - Register a rtnetlink message type
  125. * @protocol: Protocol family or PF_UNSPEC
  126. * @msgtype: rtnetlink message type
  127. * @doit: Function pointer called for each request message
  128. * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
  129. *
  130. * Registers the specified function pointers (at least one of them has
  131. * to be non-NULL) to be called whenever a request message for the
  132. * specified protocol family and message type is received.
  133. *
  134. * The special protocol family PF_UNSPEC may be used to define fallback
  135. * function pointers for the case when no entry for the specific protocol
  136. * family exists.
  137. *
  138. * Returns 0 on success or a negative error code.
  139. */
  140. int __rtnl_register(int protocol, int msgtype,
  141. rtnl_doit_func doit, rtnl_dumpit_func dumpit)
  142. {
  143. struct rtnl_link *tab;
  144. int msgindex;
  145. BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
  146. msgindex = rtm_msgindex(msgtype);
  147. tab = rtnl_msg_handlers[protocol];
  148. if (tab == NULL) {
  149. tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
  150. if (tab == NULL)
  151. return -ENOBUFS;
  152. rtnl_msg_handlers[protocol] = tab;
  153. }
  154. if (doit)
  155. tab[msgindex].doit = doit;
  156. if (dumpit)
  157. tab[msgindex].dumpit = dumpit;
  158. return 0;
  159. }
  160. EXPORT_SYMBOL_GPL(__rtnl_register);
  161. /**
  162. * rtnl_register - Register a rtnetlink message type
  163. *
  164. * Identical to __rtnl_register() but panics on failure. This is useful
  165. * as failure of this function is very unlikely, it can only happen due
  166. * to lack of memory when allocating the chain to store all message
  167. * handlers for a protocol. Meant for use in init functions where lack
  168. * of memory implies no sense in continueing.
  169. */
  170. void rtnl_register(int protocol, int msgtype,
  171. rtnl_doit_func doit, rtnl_dumpit_func dumpit)
  172. {
  173. if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
  174. panic("Unable to register rtnetlink message handler, "
  175. "protocol = %d, message type = %d\n",
  176. protocol, msgtype);
  177. }
  178. EXPORT_SYMBOL_GPL(rtnl_register);
  179. /**
  180. * rtnl_unregister - Unregister a rtnetlink message type
  181. * @protocol: Protocol family or PF_UNSPEC
  182. * @msgtype: rtnetlink message type
  183. *
  184. * Returns 0 on success or a negative error code.
  185. */
  186. int rtnl_unregister(int protocol, int msgtype)
  187. {
  188. int msgindex;
  189. BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
  190. msgindex = rtm_msgindex(msgtype);
  191. if (rtnl_msg_handlers[protocol] == NULL)
  192. return -ENOENT;
  193. rtnl_msg_handlers[protocol][msgindex].doit = NULL;
  194. rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
  195. return 0;
  196. }
  197. EXPORT_SYMBOL_GPL(rtnl_unregister);
  198. /**
  199. * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
  200. * @protocol : Protocol family or PF_UNSPEC
  201. *
  202. * Identical to calling rtnl_unregster() for all registered message types
  203. * of a certain protocol family.
  204. */
  205. void rtnl_unregister_all(int protocol)
  206. {
  207. BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
  208. kfree(rtnl_msg_handlers[protocol]);
  209. rtnl_msg_handlers[protocol] = NULL;
  210. }
  211. EXPORT_SYMBOL_GPL(rtnl_unregister_all);
  212. static LIST_HEAD(link_ops);
  213. /**
  214. * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
  215. * @ops: struct rtnl_link_ops * to register
  216. *
  217. * The caller must hold the rtnl_mutex. This function should be used
  218. * by drivers that create devices during module initialization. It
  219. * must be called before registering the devices.
  220. *
  221. * Returns 0 on success or a negative error code.
  222. */
  223. int __rtnl_link_register(struct rtnl_link_ops *ops)
  224. {
  225. if (!ops->dellink)
  226. ops->dellink = unregister_netdevice_queue;
  227. list_add_tail(&ops->list, &link_ops);
  228. return 0;
  229. }
  230. EXPORT_SYMBOL_GPL(__rtnl_link_register);
  231. /**
  232. * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
  233. * @ops: struct rtnl_link_ops * to register
  234. *
  235. * Returns 0 on success or a negative error code.
  236. */
  237. int rtnl_link_register(struct rtnl_link_ops *ops)
  238. {
  239. int err;
  240. rtnl_lock();
  241. err = __rtnl_link_register(ops);
  242. rtnl_unlock();
  243. return err;
  244. }
  245. EXPORT_SYMBOL_GPL(rtnl_link_register);
  246. static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
  247. {
  248. struct net_device *dev;
  249. LIST_HEAD(list_kill);
  250. for_each_netdev(net, dev) {
  251. if (dev->rtnl_link_ops == ops)
  252. ops->dellink(dev, &list_kill);
  253. }
  254. unregister_netdevice_many(&list_kill);
  255. }
  256. void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
  257. {
  258. rtnl_lock();
  259. __rtnl_kill_links(net, ops);
  260. rtnl_unlock();
  261. }
  262. EXPORT_SYMBOL_GPL(rtnl_kill_links);
  263. /**
  264. * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
  265. * @ops: struct rtnl_link_ops * to unregister
  266. *
  267. * The caller must hold the rtnl_mutex.
  268. */
  269. void __rtnl_link_unregister(struct rtnl_link_ops *ops)
  270. {
  271. struct net *net;
  272. for_each_net(net) {
  273. __rtnl_kill_links(net, ops);
  274. }
  275. list_del(&ops->list);
  276. }
  277. EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
  278. /**
  279. * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
  280. * @ops: struct rtnl_link_ops * to unregister
  281. */
  282. void rtnl_link_unregister(struct rtnl_link_ops *ops)
  283. {
  284. rtnl_lock();
  285. __rtnl_link_unregister(ops);
  286. rtnl_unlock();
  287. }
  288. EXPORT_SYMBOL_GPL(rtnl_link_unregister);
  289. static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
  290. {
  291. const struct rtnl_link_ops *ops;
  292. list_for_each_entry(ops, &link_ops, list) {
  293. if (!strcmp(ops->kind, kind))
  294. return ops;
  295. }
  296. return NULL;
  297. }
  298. static size_t rtnl_link_get_size(const struct net_device *dev)
  299. {
  300. const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
  301. size_t size;
  302. if (!ops)
  303. return 0;
  304. size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
  305. nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
  306. if (ops->get_size)
  307. /* IFLA_INFO_DATA + nested data */
  308. size += nlmsg_total_size(sizeof(struct nlattr)) +
  309. ops->get_size(dev);
  310. if (ops->get_xstats_size)
  311. size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
  312. return size;
  313. }
  314. static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
  315. {
  316. const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
  317. struct nlattr *linkinfo, *data;
  318. int err = -EMSGSIZE;
  319. linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
  320. if (linkinfo == NULL)
  321. goto out;
  322. if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
  323. goto err_cancel_link;
  324. if (ops->fill_xstats) {
  325. err = ops->fill_xstats(skb, dev);
  326. if (err < 0)
  327. goto err_cancel_link;
  328. }
  329. if (ops->fill_info) {
  330. data = nla_nest_start(skb, IFLA_INFO_DATA);
  331. if (data == NULL)
  332. goto err_cancel_link;
  333. err = ops->fill_info(skb, dev);
  334. if (err < 0)
  335. goto err_cancel_data;
  336. nla_nest_end(skb, data);
  337. }
  338. nla_nest_end(skb, linkinfo);
  339. return 0;
  340. err_cancel_data:
  341. nla_nest_cancel(skb, data);
  342. err_cancel_link:
  343. nla_nest_cancel(skb, linkinfo);
  344. out:
  345. return err;
  346. }
  347. static const int rtm_min[RTM_NR_FAMILIES] =
  348. {
  349. [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
  350. [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
  351. [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
  352. [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
  353. [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
  354. [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
  355. [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
  356. [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
  357. [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
  358. [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
  359. };
  360. static const int rta_max[RTM_NR_FAMILIES] =
  361. {
  362. [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
  363. [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
  364. [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
  365. [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
  366. [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
  367. [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
  368. [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
  369. [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
  370. };
  371. void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
  372. {
  373. struct rtattr *rta;
  374. int size = RTA_LENGTH(attrlen);
  375. rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
  376. rta->rta_type = attrtype;
  377. rta->rta_len = size;
  378. memcpy(RTA_DATA(rta), data, attrlen);
  379. memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
  380. }
  381. EXPORT_SYMBOL(__rta_fill);
  382. int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
  383. {
  384. struct sock *rtnl = net->rtnl;
  385. int err = 0;
  386. NETLINK_CB(skb).dst_group = group;
  387. if (echo)
  388. atomic_inc(&skb->users);
  389. netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
  390. if (echo)
  391. err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
  392. return err;
  393. }
  394. int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
  395. {
  396. struct sock *rtnl = net->rtnl;
  397. return nlmsg_unicast(rtnl, skb, pid);
  398. }
  399. EXPORT_SYMBOL(rtnl_unicast);
  400. void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
  401. struct nlmsghdr *nlh, gfp_t flags)
  402. {
  403. struct sock *rtnl = net->rtnl;
  404. int report = 0;
  405. if (nlh)
  406. report = nlmsg_report(nlh);
  407. nlmsg_notify(rtnl, skb, pid, group, report, flags);
  408. }
  409. EXPORT_SYMBOL(rtnl_notify);
  410. void rtnl_set_sk_err(struct net *net, u32 group, int error)
  411. {
  412. struct sock *rtnl = net->rtnl;
  413. netlink_set_err(rtnl, 0, group, error);
  414. }
  415. EXPORT_SYMBOL(rtnl_set_sk_err);
  416. int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
  417. {
  418. struct nlattr *mx;
  419. int i, valid = 0;
  420. mx = nla_nest_start(skb, RTA_METRICS);
  421. if (mx == NULL)
  422. return -ENOBUFS;
  423. for (i = 0; i < RTAX_MAX; i++) {
  424. if (metrics[i]) {
  425. valid++;
  426. NLA_PUT_U32(skb, i+1, metrics[i]);
  427. }
  428. }
  429. if (!valid) {
  430. nla_nest_cancel(skb, mx);
  431. return 0;
  432. }
  433. return nla_nest_end(skb, mx);
  434. nla_put_failure:
  435. nla_nest_cancel(skb, mx);
  436. return -EMSGSIZE;
  437. }
  438. EXPORT_SYMBOL(rtnetlink_put_metrics);
  439. int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
  440. u32 ts, u32 tsage, long expires, u32 error)
  441. {
  442. struct rta_cacheinfo ci = {
  443. .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
  444. .rta_used = dst->__use,
  445. .rta_clntref = atomic_read(&(dst->__refcnt)),
  446. .rta_error = error,
  447. .rta_id = id,
  448. .rta_ts = ts,
  449. .rta_tsage = tsage,
  450. };
  451. if (expires)
  452. ci.rta_expires = jiffies_to_clock_t(expires);
  453. return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
  454. }
  455. EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
  456. static void set_operstate(struct net_device *dev, unsigned char transition)
  457. {
  458. unsigned char operstate = dev->operstate;
  459. switch (transition) {
  460. case IF_OPER_UP:
  461. if ((operstate == IF_OPER_DORMANT ||
  462. operstate == IF_OPER_UNKNOWN) &&
  463. !netif_dormant(dev))
  464. operstate = IF_OPER_UP;
  465. break;
  466. case IF_OPER_DORMANT:
  467. if (operstate == IF_OPER_UP ||
  468. operstate == IF_OPER_UNKNOWN)
  469. operstate = IF_OPER_DORMANT;
  470. break;
  471. }
  472. if (dev->operstate != operstate) {
  473. write_lock_bh(&dev_base_lock);
  474. dev->operstate = operstate;
  475. write_unlock_bh(&dev_base_lock);
  476. netdev_state_change(dev);
  477. }
  478. }
  479. static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
  480. const struct ifinfomsg *ifm)
  481. {
  482. unsigned int flags = ifm->ifi_flags;
  483. /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
  484. if (ifm->ifi_change)
  485. flags = (flags & ifm->ifi_change) |
  486. (dev->flags & ~ifm->ifi_change);
  487. return flags;
  488. }
  489. static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
  490. const struct net_device_stats *b)
  491. {
  492. a->rx_packets = b->rx_packets;
  493. a->tx_packets = b->tx_packets;
  494. a->rx_bytes = b->rx_bytes;
  495. a->tx_bytes = b->tx_bytes;
  496. a->rx_errors = b->rx_errors;
  497. a->tx_errors = b->tx_errors;
  498. a->rx_dropped = b->rx_dropped;
  499. a->tx_dropped = b->tx_dropped;
  500. a->multicast = b->multicast;
  501. a->collisions = b->collisions;
  502. a->rx_length_errors = b->rx_length_errors;
  503. a->rx_over_errors = b->rx_over_errors;
  504. a->rx_crc_errors = b->rx_crc_errors;
  505. a->rx_frame_errors = b->rx_frame_errors;
  506. a->rx_fifo_errors = b->rx_fifo_errors;
  507. a->rx_missed_errors = b->rx_missed_errors;
  508. a->tx_aborted_errors = b->tx_aborted_errors;
  509. a->tx_carrier_errors = b->tx_carrier_errors;
  510. a->tx_fifo_errors = b->tx_fifo_errors;
  511. a->tx_heartbeat_errors = b->tx_heartbeat_errors;
  512. a->tx_window_errors = b->tx_window_errors;
  513. a->rx_compressed = b->rx_compressed;
  514. a->tx_compressed = b->tx_compressed;
  515. }
  516. static void copy_rtnl_link_stats64(void *v, const struct net_device_stats *b)
  517. {
  518. struct rtnl_link_stats64 a;
  519. a.rx_packets = b->rx_packets;
  520. a.tx_packets = b->tx_packets;
  521. a.rx_bytes = b->rx_bytes;
  522. a.tx_bytes = b->tx_bytes;
  523. a.rx_errors = b->rx_errors;
  524. a.tx_errors = b->tx_errors;
  525. a.rx_dropped = b->rx_dropped;
  526. a.tx_dropped = b->tx_dropped;
  527. a.multicast = b->multicast;
  528. a.collisions = b->collisions;
  529. a.rx_length_errors = b->rx_length_errors;
  530. a.rx_over_errors = b->rx_over_errors;
  531. a.rx_crc_errors = b->rx_crc_errors;
  532. a.rx_frame_errors = b->rx_frame_errors;
  533. a.rx_fifo_errors = b->rx_fifo_errors;
  534. a.rx_missed_errors = b->rx_missed_errors;
  535. a.tx_aborted_errors = b->tx_aborted_errors;
  536. a.tx_carrier_errors = b->tx_carrier_errors;
  537. a.tx_fifo_errors = b->tx_fifo_errors;
  538. a.tx_heartbeat_errors = b->tx_heartbeat_errors;
  539. a.tx_window_errors = b->tx_window_errors;
  540. a.rx_compressed = b->rx_compressed;
  541. a.tx_compressed = b->tx_compressed;
  542. memcpy(v, &a, sizeof(a));
  543. }
  544. /* All VF info */
  545. static inline int rtnl_vfinfo_size(const struct net_device *dev)
  546. {
  547. if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
  548. int num_vfs = dev_num_vf(dev->dev.parent);
  549. size_t size = nlmsg_total_size(sizeof(struct nlattr));
  550. size += nlmsg_total_size(num_vfs * sizeof(struct nlattr));
  551. size += num_vfs * (sizeof(struct ifla_vf_mac) +
  552. sizeof(struct ifla_vf_vlan) +
  553. sizeof(struct ifla_vf_tx_rate));
  554. return size;
  555. } else
  556. return 0;
  557. }
  558. static size_t rtnl_port_size(const struct net_device *dev)
  559. {
  560. size_t port_size = nla_total_size(4) /* PORT_VF */
  561. + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
  562. + nla_total_size(sizeof(struct ifla_port_vsi))
  563. /* PORT_VSI_TYPE */
  564. + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
  565. + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
  566. + nla_total_size(1) /* PROT_VDP_REQUEST */
  567. + nla_total_size(2); /* PORT_VDP_RESPONSE */
  568. size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
  569. size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
  570. + port_size;
  571. size_t port_self_size = nla_total_size(sizeof(struct nlattr))
  572. + port_size;
  573. if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
  574. return 0;
  575. if (dev_num_vf(dev->dev.parent))
  576. return port_self_size + vf_ports_size +
  577. vf_port_size * dev_num_vf(dev->dev.parent);
  578. else
  579. return port_self_size;
  580. }
  581. static inline size_t if_nlmsg_size(const struct net_device *dev)
  582. {
  583. return NLMSG_ALIGN(sizeof(struct ifinfomsg))
  584. + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
  585. + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
  586. + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
  587. + nla_total_size(sizeof(struct rtnl_link_ifmap))
  588. + nla_total_size(sizeof(struct rtnl_link_stats))
  589. + nla_total_size(sizeof(struct rtnl_link_stats64))
  590. + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
  591. + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
  592. + nla_total_size(4) /* IFLA_TXQLEN */
  593. + nla_total_size(4) /* IFLA_WEIGHT */
  594. + nla_total_size(4) /* IFLA_MTU */
  595. + nla_total_size(4) /* IFLA_LINK */
  596. + nla_total_size(4) /* IFLA_MASTER */
  597. + nla_total_size(1) /* IFLA_OPERSTATE */
  598. + nla_total_size(1) /* IFLA_LINKMODE */
  599. + nla_total_size(4) /* IFLA_NUM_VF */
  600. + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
  601. + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
  602. + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
  603. }
  604. static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
  605. {
  606. struct nlattr *vf_ports;
  607. struct nlattr *vf_port;
  608. int vf;
  609. int err;
  610. vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
  611. if (!vf_ports)
  612. return -EMSGSIZE;
  613. for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
  614. vf_port = nla_nest_start(skb, IFLA_VF_PORT);
  615. if (!vf_port) {
  616. nla_nest_cancel(skb, vf_ports);
  617. return -EMSGSIZE;
  618. }
  619. NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
  620. err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
  621. if (err) {
  622. nla_put_failure:
  623. nla_nest_cancel(skb, vf_port);
  624. continue;
  625. }
  626. nla_nest_end(skb, vf_port);
  627. }
  628. nla_nest_end(skb, vf_ports);
  629. return 0;
  630. }
  631. static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
  632. {
  633. struct nlattr *port_self;
  634. int err;
  635. port_self = nla_nest_start(skb, IFLA_PORT_SELF);
  636. if (!port_self)
  637. return -EMSGSIZE;
  638. err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
  639. if (err) {
  640. nla_nest_cancel(skb, port_self);
  641. return err;
  642. }
  643. nla_nest_end(skb, port_self);
  644. return 0;
  645. }
  646. static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
  647. {
  648. int err;
  649. if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
  650. return 0;
  651. err = rtnl_port_self_fill(skb, dev);
  652. if (err)
  653. return err;
  654. if (dev_num_vf(dev->dev.parent)) {
  655. err = rtnl_vf_ports_fill(skb, dev);
  656. if (err)
  657. return err;
  658. }
  659. return 0;
  660. }
  661. static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
  662. int type, u32 pid, u32 seq, u32 change,
  663. unsigned int flags)
  664. {
  665. struct ifinfomsg *ifm;
  666. struct nlmsghdr *nlh;
  667. const struct net_device_stats *stats;
  668. struct nlattr *attr;
  669. nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
  670. if (nlh == NULL)
  671. return -EMSGSIZE;
  672. ifm = nlmsg_data(nlh);
  673. ifm->ifi_family = AF_UNSPEC;
  674. ifm->__ifi_pad = 0;
  675. ifm->ifi_type = dev->type;
  676. ifm->ifi_index = dev->ifindex;
  677. ifm->ifi_flags = dev_get_flags(dev);
  678. ifm->ifi_change = change;
  679. NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
  680. NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
  681. NLA_PUT_U8(skb, IFLA_OPERSTATE,
  682. netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
  683. NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
  684. NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
  685. if (dev->ifindex != dev->iflink)
  686. NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
  687. if (dev->master)
  688. NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
  689. if (dev->qdisc)
  690. NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
  691. if (dev->ifalias)
  692. NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
  693. if (1) {
  694. struct rtnl_link_ifmap map = {
  695. .mem_start = dev->mem_start,
  696. .mem_end = dev->mem_end,
  697. .base_addr = dev->base_addr,
  698. .irq = dev->irq,
  699. .dma = dev->dma,
  700. .port = dev->if_port,
  701. };
  702. NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
  703. }
  704. if (dev->addr_len) {
  705. NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
  706. NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
  707. }
  708. attr = nla_reserve(skb, IFLA_STATS,
  709. sizeof(struct rtnl_link_stats));
  710. if (attr == NULL)
  711. goto nla_put_failure;
  712. stats = dev_get_stats(dev);
  713. copy_rtnl_link_stats(nla_data(attr), stats);
  714. attr = nla_reserve(skb, IFLA_STATS64,
  715. sizeof(struct rtnl_link_stats64));
  716. if (attr == NULL)
  717. goto nla_put_failure;
  718. copy_rtnl_link_stats64(nla_data(attr), stats);
  719. if (dev->dev.parent)
  720. NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
  721. if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
  722. int i;
  723. struct nlattr *vfinfo, *vf;
  724. int num_vfs = dev_num_vf(dev->dev.parent);
  725. vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
  726. if (!vfinfo)
  727. goto nla_put_failure;
  728. for (i = 0; i < num_vfs; i++) {
  729. struct ifla_vf_info ivi;
  730. struct ifla_vf_mac vf_mac;
  731. struct ifla_vf_vlan vf_vlan;
  732. struct ifla_vf_tx_rate vf_tx_rate;
  733. if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
  734. break;
  735. vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
  736. memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
  737. vf_vlan.vlan = ivi.vlan;
  738. vf_vlan.qos = ivi.qos;
  739. vf_tx_rate.rate = ivi.tx_rate;
  740. vf = nla_nest_start(skb, IFLA_VF_INFO);
  741. if (!vf) {
  742. nla_nest_cancel(skb, vfinfo);
  743. goto nla_put_failure;
  744. }
  745. NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
  746. NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
  747. NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
  748. nla_nest_end(skb, vf);
  749. }
  750. nla_nest_end(skb, vfinfo);
  751. }
  752. if (rtnl_port_fill(skb, dev))
  753. goto nla_put_failure;
  754. if (dev->rtnl_link_ops) {
  755. if (rtnl_link_fill(skb, dev) < 0)
  756. goto nla_put_failure;
  757. }
  758. return nlmsg_end(skb, nlh);
  759. nla_put_failure:
  760. nlmsg_cancel(skb, nlh);
  761. return -EMSGSIZE;
  762. }
  763. static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
  764. {
  765. struct net *net = sock_net(skb->sk);
  766. int h, s_h;
  767. int idx = 0, s_idx;
  768. struct net_device *dev;
  769. struct hlist_head *head;
  770. struct hlist_node *node;
  771. s_h = cb->args[0];
  772. s_idx = cb->args[1];
  773. for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
  774. idx = 0;
  775. head = &net->dev_index_head[h];
  776. hlist_for_each_entry(dev, node, head, index_hlist) {
  777. if (idx < s_idx)
  778. goto cont;
  779. if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
  780. NETLINK_CB(cb->skb).pid,
  781. cb->nlh->nlmsg_seq, 0,
  782. NLM_F_MULTI) <= 0)
  783. goto out;
  784. cont:
  785. idx++;
  786. }
  787. }
  788. out:
  789. cb->args[1] = idx;
  790. cb->args[0] = h;
  791. return skb->len;
  792. }
  793. const struct nla_policy ifla_policy[IFLA_MAX+1] = {
  794. [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
  795. [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
  796. [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
  797. [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
  798. [IFLA_MTU] = { .type = NLA_U32 },
  799. [IFLA_LINK] = { .type = NLA_U32 },
  800. [IFLA_TXQLEN] = { .type = NLA_U32 },
  801. [IFLA_WEIGHT] = { .type = NLA_U32 },
  802. [IFLA_OPERSTATE] = { .type = NLA_U8 },
  803. [IFLA_LINKMODE] = { .type = NLA_U8 },
  804. [IFLA_LINKINFO] = { .type = NLA_NESTED },
  805. [IFLA_NET_NS_PID] = { .type = NLA_U32 },
  806. [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
  807. [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
  808. [IFLA_VF_PORTS] = { .type = NLA_NESTED },
  809. [IFLA_PORT_SELF] = { .type = NLA_NESTED },
  810. };
  811. EXPORT_SYMBOL(ifla_policy);
  812. static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
  813. [IFLA_INFO_KIND] = { .type = NLA_STRING },
  814. [IFLA_INFO_DATA] = { .type = NLA_NESTED },
  815. };
  816. static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
  817. [IFLA_VF_INFO] = { .type = NLA_NESTED },
  818. };
  819. static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
  820. [IFLA_VF_MAC] = { .type = NLA_BINARY,
  821. .len = sizeof(struct ifla_vf_mac) },
  822. [IFLA_VF_VLAN] = { .type = NLA_BINARY,
  823. .len = sizeof(struct ifla_vf_vlan) },
  824. [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
  825. .len = sizeof(struct ifla_vf_tx_rate) },
  826. };
  827. static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
  828. [IFLA_PORT_VF] = { .type = NLA_U32 },
  829. [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
  830. .len = PORT_PROFILE_MAX },
  831. [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
  832. .len = sizeof(struct ifla_port_vsi)},
  833. [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
  834. .len = PORT_UUID_MAX },
  835. [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
  836. .len = PORT_UUID_MAX },
  837. [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
  838. [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
  839. };
  840. struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
  841. {
  842. struct net *net;
  843. /* Examine the link attributes and figure out which
  844. * network namespace we are talking about.
  845. */
  846. if (tb[IFLA_NET_NS_PID])
  847. net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
  848. else
  849. net = get_net(src_net);
  850. return net;
  851. }
  852. EXPORT_SYMBOL(rtnl_link_get_net);
  853. static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
  854. {
  855. if (dev) {
  856. if (tb[IFLA_ADDRESS] &&
  857. nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
  858. return -EINVAL;
  859. if (tb[IFLA_BROADCAST] &&
  860. nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
  861. return -EINVAL;
  862. }
  863. return 0;
  864. }
  865. static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
  866. {
  867. int rem, err = -EINVAL;
  868. struct nlattr *vf;
  869. const struct net_device_ops *ops = dev->netdev_ops;
  870. nla_for_each_nested(vf, attr, rem) {
  871. switch (nla_type(vf)) {
  872. case IFLA_VF_MAC: {
  873. struct ifla_vf_mac *ivm;
  874. ivm = nla_data(vf);
  875. err = -EOPNOTSUPP;
  876. if (ops->ndo_set_vf_mac)
  877. err = ops->ndo_set_vf_mac(dev, ivm->vf,
  878. ivm->mac);
  879. break;
  880. }
  881. case IFLA_VF_VLAN: {
  882. struct ifla_vf_vlan *ivv;
  883. ivv = nla_data(vf);
  884. err = -EOPNOTSUPP;
  885. if (ops->ndo_set_vf_vlan)
  886. err = ops->ndo_set_vf_vlan(dev, ivv->vf,
  887. ivv->vlan,
  888. ivv->qos);
  889. break;
  890. }
  891. case IFLA_VF_TX_RATE: {
  892. struct ifla_vf_tx_rate *ivt;
  893. ivt = nla_data(vf);
  894. err = -EOPNOTSUPP;
  895. if (ops->ndo_set_vf_tx_rate)
  896. err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
  897. ivt->rate);
  898. break;
  899. }
  900. default:
  901. err = -EINVAL;
  902. break;
  903. }
  904. if (err)
  905. break;
  906. }
  907. return err;
  908. }
  909. static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
  910. struct nlattr **tb, char *ifname, int modified)
  911. {
  912. const struct net_device_ops *ops = dev->netdev_ops;
  913. int send_addr_notify = 0;
  914. int err;
  915. if (tb[IFLA_NET_NS_PID]) {
  916. struct net *net = rtnl_link_get_net(dev_net(dev), tb);
  917. if (IS_ERR(net)) {
  918. err = PTR_ERR(net);
  919. goto errout;
  920. }
  921. err = dev_change_net_namespace(dev, net, ifname);
  922. put_net(net);
  923. if (err)
  924. goto errout;
  925. modified = 1;
  926. }
  927. if (tb[IFLA_MAP]) {
  928. struct rtnl_link_ifmap *u_map;
  929. struct ifmap k_map;
  930. if (!ops->ndo_set_config) {
  931. err = -EOPNOTSUPP;
  932. goto errout;
  933. }
  934. if (!netif_device_present(dev)) {
  935. err = -ENODEV;
  936. goto errout;
  937. }
  938. u_map = nla_data(tb[IFLA_MAP]);
  939. k_map.mem_start = (unsigned long) u_map->mem_start;
  940. k_map.mem_end = (unsigned long) u_map->mem_end;
  941. k_map.base_addr = (unsigned short) u_map->base_addr;
  942. k_map.irq = (unsigned char) u_map->irq;
  943. k_map.dma = (unsigned char) u_map->dma;
  944. k_map.port = (unsigned char) u_map->port;
  945. err = ops->ndo_set_config(dev, &k_map);
  946. if (err < 0)
  947. goto errout;
  948. modified = 1;
  949. }
  950. if (tb[IFLA_ADDRESS]) {
  951. struct sockaddr *sa;
  952. int len;
  953. if (!ops->ndo_set_mac_address) {
  954. err = -EOPNOTSUPP;
  955. goto errout;
  956. }
  957. if (!netif_device_present(dev)) {
  958. err = -ENODEV;
  959. goto errout;
  960. }
  961. len = sizeof(sa_family_t) + dev->addr_len;
  962. sa = kmalloc(len, GFP_KERNEL);
  963. if (!sa) {
  964. err = -ENOMEM;
  965. goto errout;
  966. }
  967. sa->sa_family = dev->type;
  968. memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
  969. dev->addr_len);
  970. err = ops->ndo_set_mac_address(dev, sa);
  971. kfree(sa);
  972. if (err)
  973. goto errout;
  974. send_addr_notify = 1;
  975. modified = 1;
  976. }
  977. if (tb[IFLA_MTU]) {
  978. err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
  979. if (err < 0)
  980. goto errout;
  981. modified = 1;
  982. }
  983. /*
  984. * Interface selected by interface index but interface
  985. * name provided implies that a name change has been
  986. * requested.
  987. */
  988. if (ifm->ifi_index > 0 && ifname[0]) {
  989. err = dev_change_name(dev, ifname);
  990. if (err < 0)
  991. goto errout;
  992. modified = 1;
  993. }
  994. if (tb[IFLA_IFALIAS]) {
  995. err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
  996. nla_len(tb[IFLA_IFALIAS]));
  997. if (err < 0)
  998. goto errout;
  999. modified = 1;
  1000. }
  1001. if (tb[IFLA_BROADCAST]) {
  1002. nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
  1003. send_addr_notify = 1;
  1004. }
  1005. if (ifm->ifi_flags || ifm->ifi_change) {
  1006. err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
  1007. if (err < 0)
  1008. goto errout;
  1009. }
  1010. if (tb[IFLA_TXQLEN])
  1011. dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
  1012. if (tb[IFLA_OPERSTATE])
  1013. set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
  1014. if (tb[IFLA_LINKMODE]) {
  1015. write_lock_bh(&dev_base_lock);
  1016. dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
  1017. write_unlock_bh(&dev_base_lock);
  1018. }
  1019. if (tb[IFLA_VFINFO_LIST]) {
  1020. struct nlattr *attr;
  1021. int rem;
  1022. nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
  1023. if (nla_type(attr) != IFLA_VF_INFO) {
  1024. err = -EINVAL;
  1025. goto errout;
  1026. }
  1027. err = do_setvfinfo(dev, attr);
  1028. if (err < 0)
  1029. goto errout;
  1030. modified = 1;
  1031. }
  1032. }
  1033. err = 0;
  1034. if (tb[IFLA_VF_PORTS]) {
  1035. struct nlattr *port[IFLA_PORT_MAX+1];
  1036. struct nlattr *attr;
  1037. int vf;
  1038. int rem;
  1039. err = -EOPNOTSUPP;
  1040. if (!ops->ndo_set_vf_port)
  1041. goto errout;
  1042. nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
  1043. if (nla_type(attr) != IFLA_VF_PORT)
  1044. continue;
  1045. err = nla_parse_nested(port, IFLA_PORT_MAX,
  1046. attr, ifla_port_policy);
  1047. if (err < 0)
  1048. goto errout;
  1049. if (!port[IFLA_PORT_VF]) {
  1050. err = -EOPNOTSUPP;
  1051. goto errout;
  1052. }
  1053. vf = nla_get_u32(port[IFLA_PORT_VF]);
  1054. err = ops->ndo_set_vf_port(dev, vf, port);
  1055. if (err < 0)
  1056. goto errout;
  1057. modified = 1;
  1058. }
  1059. }
  1060. err = 0;
  1061. if (tb[IFLA_PORT_SELF]) {
  1062. struct nlattr *port[IFLA_PORT_MAX+1];
  1063. err = nla_parse_nested(port, IFLA_PORT_MAX,
  1064. tb[IFLA_PORT_SELF], ifla_port_policy);
  1065. if (err < 0)
  1066. goto errout;
  1067. err = -EOPNOTSUPP;
  1068. if (ops->ndo_set_vf_port)
  1069. err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
  1070. if (err < 0)
  1071. goto errout;
  1072. modified = 1;
  1073. }
  1074. err = 0;
  1075. errout:
  1076. if (err < 0 && modified && net_ratelimit())
  1077. printk(KERN_WARNING "A link change request failed with "
  1078. "some changes comitted already. Interface %s may "
  1079. "have been left with an inconsistent configuration, "
  1080. "please check.\n", dev->name);
  1081. if (send_addr_notify)
  1082. call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
  1083. return err;
  1084. }
  1085. static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
  1086. {
  1087. struct net *net = sock_net(skb->sk);
  1088. struct ifinfomsg *ifm;
  1089. struct net_device *dev;
  1090. int err;
  1091. struct nlattr *tb[IFLA_MAX+1];
  1092. char ifname[IFNAMSIZ];
  1093. err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
  1094. if (err < 0)
  1095. goto errout;
  1096. if (tb[IFLA_IFNAME])
  1097. nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
  1098. else
  1099. ifname[0] = '\0';
  1100. err = -EINVAL;
  1101. ifm = nlmsg_data(nlh);
  1102. if (ifm->ifi_index > 0)
  1103. dev = __dev_get_by_index(net, ifm->ifi_index);
  1104. else if (tb[IFLA_IFNAME])
  1105. dev = __dev_get_by_name(net, ifname);
  1106. else
  1107. goto errout;
  1108. if (dev == NULL) {
  1109. err = -ENODEV;
  1110. goto errout;
  1111. }
  1112. err = validate_linkmsg(dev, tb);
  1113. if (err < 0)
  1114. goto errout;
  1115. err = do_setlink(dev, ifm, tb, ifname, 0);
  1116. errout:
  1117. return err;
  1118. }
  1119. static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
  1120. {
  1121. struct net *net = sock_net(skb->sk);
  1122. const struct rtnl_link_ops *ops;
  1123. struct net_device *dev;
  1124. struct ifinfomsg *ifm;
  1125. char ifname[IFNAMSIZ];
  1126. struct nlattr *tb[IFLA_MAX+1];
  1127. int err;
  1128. err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
  1129. if (err < 0)
  1130. return err;
  1131. if (tb[IFLA_IFNAME])
  1132. nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
  1133. ifm = nlmsg_data(nlh);
  1134. if (ifm->ifi_index > 0)
  1135. dev = __dev_get_by_index(net, ifm->ifi_index);
  1136. else if (tb[IFLA_IFNAME])
  1137. dev = __dev_get_by_name(net, ifname);
  1138. else
  1139. return -EINVAL;
  1140. if (!dev)
  1141. return -ENODEV;
  1142. ops = dev->rtnl_link_ops;
  1143. if (!ops)
  1144. return -EOPNOTSUPP;
  1145. ops->dellink(dev, NULL);
  1146. return 0;
  1147. }
  1148. int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
  1149. {
  1150. unsigned int old_flags;
  1151. int err;
  1152. old_flags = dev->flags;
  1153. if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
  1154. err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
  1155. if (err < 0)
  1156. return err;
  1157. }
  1158. dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
  1159. rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
  1160. __dev_notify_flags(dev, old_flags);
  1161. return 0;
  1162. }
  1163. EXPORT_SYMBOL(rtnl_configure_link);
  1164. struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
  1165. char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
  1166. {
  1167. int err;
  1168. struct net_device *dev;
  1169. unsigned int num_queues = 1;
  1170. unsigned int real_num_queues = 1;
  1171. if (ops->get_tx_queues) {
  1172. err = ops->get_tx_queues(src_net, tb, &num_queues,
  1173. &real_num_queues);
  1174. if (err)
  1175. goto err;
  1176. }
  1177. err = -ENOMEM;
  1178. dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
  1179. if (!dev)
  1180. goto err;
  1181. dev_net_set(dev, net);
  1182. dev->rtnl_link_ops = ops;
  1183. dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
  1184. dev->real_num_tx_queues = real_num_queues;
  1185. if (strchr(dev->name, '%')) {
  1186. err = dev_alloc_name(dev, dev->name);
  1187. if (err < 0)
  1188. goto err_free;
  1189. }
  1190. if (tb[IFLA_MTU])
  1191. dev->mtu = nla_get_u32(tb[IFLA_MTU]);
  1192. if (tb[IFLA_ADDRESS])
  1193. memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
  1194. nla_len(tb[IFLA_ADDRESS]));
  1195. if (tb[IFLA_BROADCAST])
  1196. memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
  1197. nla_len(tb[IFLA_BROADCAST]));
  1198. if (tb[IFLA_TXQLEN])
  1199. dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
  1200. if (tb[IFLA_OPERSTATE])
  1201. set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
  1202. if (tb[IFLA_LINKMODE])
  1203. dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
  1204. return dev;
  1205. err_free:
  1206. free_netdev(dev);
  1207. err:
  1208. return ERR_PTR(err);
  1209. }
  1210. EXPORT_SYMBOL(rtnl_create_link);
  1211. static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
  1212. {
  1213. struct net *net = sock_net(skb->sk);
  1214. const struct rtnl_link_ops *ops;
  1215. struct net_device *dev;
  1216. struct ifinfomsg *ifm;
  1217. char kind[MODULE_NAME_LEN];
  1218. char ifname[IFNAMSIZ];
  1219. struct nlattr *tb[IFLA_MAX+1];
  1220. struct nlattr *linkinfo[IFLA_INFO_MAX+1];
  1221. int err;
  1222. #ifdef CONFIG_MODULES
  1223. replay:
  1224. #endif
  1225. err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
  1226. if (err < 0)
  1227. return err;
  1228. if (tb[IFLA_IFNAME])
  1229. nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
  1230. else
  1231. ifname[0] = '\0';
  1232. ifm = nlmsg_data(nlh);
  1233. if (ifm->ifi_index > 0)
  1234. dev = __dev_get_by_index(net, ifm->ifi_index);
  1235. else if (ifname[0])
  1236. dev = __dev_get_by_name(net, ifname);
  1237. else
  1238. dev = NULL;
  1239. err = validate_linkmsg(dev, tb);
  1240. if (err < 0)
  1241. return err;
  1242. if (tb[IFLA_LINKINFO]) {
  1243. err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
  1244. tb[IFLA_LINKINFO], ifla_info_policy);
  1245. if (err < 0)
  1246. return err;
  1247. } else
  1248. memset(linkinfo, 0, sizeof(linkinfo));
  1249. if (linkinfo[IFLA_INFO_KIND]) {
  1250. nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
  1251. ops = rtnl_link_ops_get(kind);
  1252. } else {
  1253. kind[0] = '\0';
  1254. ops = NULL;
  1255. }
  1256. if (1) {
  1257. struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
  1258. struct net *dest_net;
  1259. if (ops) {
  1260. if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
  1261. err = nla_parse_nested(attr, ops->maxtype,
  1262. linkinfo[IFLA_INFO_DATA],
  1263. ops->policy);
  1264. if (err < 0)
  1265. return err;
  1266. data = attr;
  1267. }
  1268. if (ops->validate) {
  1269. err = ops->validate(tb, data);
  1270. if (err < 0)
  1271. return err;
  1272. }
  1273. }
  1274. if (dev) {
  1275. int modified = 0;
  1276. if (nlh->nlmsg_flags & NLM_F_EXCL)
  1277. return -EEXIST;
  1278. if (nlh->nlmsg_flags & NLM_F_REPLACE)
  1279. return -EOPNOTSUPP;
  1280. if (linkinfo[IFLA_INFO_DATA]) {
  1281. if (!ops || ops != dev->rtnl_link_ops ||
  1282. !ops->changelink)
  1283. return -EOPNOTSUPP;
  1284. err = ops->changelink(dev, tb, data);
  1285. if (err < 0)
  1286. return err;
  1287. modified = 1;
  1288. }
  1289. return do_setlink(dev, ifm, tb, ifname, modified);
  1290. }
  1291. if (!(nlh->nlmsg_flags & NLM_F_CREATE))
  1292. return -ENODEV;
  1293. if (ifm->ifi_index)
  1294. return -EOPNOTSUPP;
  1295. if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
  1296. return -EOPNOTSUPP;
  1297. if (!ops) {
  1298. #ifdef CONFIG_MODULES
  1299. if (kind[0]) {
  1300. __rtnl_unlock();
  1301. request_module("rtnl-link-%s", kind);
  1302. rtnl_lock();
  1303. ops = rtnl_link_ops_get(kind);
  1304. if (ops)
  1305. goto replay;
  1306. }
  1307. #endif
  1308. return -EOPNOTSUPP;
  1309. }
  1310. if (!ifname[0])
  1311. snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
  1312. dest_net = rtnl_link_get_net(net, tb);
  1313. dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
  1314. if (IS_ERR(dev))
  1315. err = PTR_ERR(dev);
  1316. else if (ops->newlink)
  1317. err = ops->newlink(net, dev, tb, data);
  1318. else
  1319. err = register_netdevice(dev);
  1320. if (err < 0 && !IS_ERR(dev))
  1321. free_netdev(dev);
  1322. if (err < 0)
  1323. goto out;
  1324. err = rtnl_configure_link(dev, ifm);
  1325. if (err < 0)
  1326. unregister_netdevice(dev);
  1327. out:
  1328. put_net(dest_net);
  1329. return err;
  1330. }
  1331. }
  1332. static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
  1333. {
  1334. struct net *net = sock_net(skb->sk);
  1335. struct ifinfomsg *ifm;
  1336. char ifname[IFNAMSIZ];
  1337. struct nlattr *tb[IFLA_MAX+1];
  1338. struct net_device *dev = NULL;
  1339. struct sk_buff *nskb;
  1340. int err;
  1341. err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
  1342. if (err < 0)
  1343. return err;
  1344. if (tb[IFLA_IFNAME])
  1345. nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
  1346. ifm = nlmsg_data(nlh);
  1347. if (ifm->ifi_index > 0)
  1348. dev = __dev_get_by_index(net, ifm->ifi_index);
  1349. else if (tb[IFLA_IFNAME])
  1350. dev = __dev_get_by_name(net, ifname);
  1351. else
  1352. return -EINVAL;
  1353. if (dev == NULL)
  1354. return -ENODEV;
  1355. nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
  1356. if (nskb == NULL)
  1357. return -ENOBUFS;
  1358. err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
  1359. nlh->nlmsg_seq, 0, 0);
  1360. if (err < 0) {
  1361. /* -EMSGSIZE implies BUG in if_nlmsg_size */
  1362. WARN_ON(err == -EMSGSIZE);
  1363. kfree_skb(nskb);
  1364. } else
  1365. err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
  1366. return err;
  1367. }
  1368. static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
  1369. {
  1370. int idx;
  1371. int s_idx = cb->family;
  1372. if (s_idx == 0)
  1373. s_idx = 1;
  1374. for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
  1375. int type = cb->nlh->nlmsg_type-RTM_BASE;
  1376. if (idx < s_idx || idx == PF_PACKET)
  1377. continue;
  1378. if (rtnl_msg_handlers[idx] == NULL ||
  1379. rtnl_msg_handlers[idx][type].dumpit == NULL)
  1380. continue;
  1381. if (idx > s_idx)
  1382. memset(&cb->args[0], 0, sizeof(cb->args));
  1383. if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
  1384. break;
  1385. }
  1386. cb->family = idx;
  1387. return skb->len;
  1388. }
  1389. void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
  1390. {
  1391. struct net *net = dev_net(dev);
  1392. struct sk_buff *skb;
  1393. int err = -ENOBUFS;
  1394. skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
  1395. if (skb == NULL)
  1396. goto errout;
  1397. err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
  1398. if (err < 0) {
  1399. /* -EMSGSIZE implies BUG in if_nlmsg_size() */
  1400. WARN_ON(err == -EMSGSIZE);
  1401. kfree_skb(skb);
  1402. goto errout;
  1403. }
  1404. rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
  1405. return;
  1406. errout:
  1407. if (err < 0)
  1408. rtnl_set_sk_err(net, RTNLGRP_LINK, err);
  1409. }
  1410. /* Protected by RTNL sempahore. */
  1411. static struct rtattr **rta_buf;
  1412. static int rtattr_max;
  1413. /* Process one rtnetlink message. */
  1414. static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
  1415. {
  1416. struct net *net = sock_net(skb->sk);
  1417. rtnl_doit_func doit;
  1418. int sz_idx, kind;
  1419. int min_len;
  1420. int family;
  1421. int type;
  1422. int err;
  1423. type = nlh->nlmsg_type;
  1424. if (type > RTM_MAX)
  1425. return -EOPNOTSUPP;
  1426. type -= RTM_BASE;
  1427. /* All the messages must have at least 1 byte length */
  1428. if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
  1429. return 0;
  1430. family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
  1431. sz_idx = type>>2;
  1432. kind = type&3;
  1433. if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
  1434. return -EPERM;
  1435. if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
  1436. struct sock *rtnl;
  1437. rtnl_dumpit_func dumpit;
  1438. dumpit = rtnl_get_dumpit(family, type);
  1439. if (dumpit == NULL)
  1440. return -EOPNOTSUPP;
  1441. __rtnl_unlock();
  1442. rtnl = net->rtnl;
  1443. err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
  1444. rtnl_lock();
  1445. return err;
  1446. }
  1447. memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
  1448. min_len = rtm_min[sz_idx];
  1449. if (nlh->nlmsg_len < min_len)
  1450. return -EINVAL;
  1451. if (nlh->nlmsg_len > min_len) {
  1452. int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
  1453. struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
  1454. while (RTA_OK(attr, attrlen)) {
  1455. unsigned flavor = attr->rta_type;
  1456. if (flavor) {
  1457. if (flavor > rta_max[sz_idx])
  1458. return -EINVAL;
  1459. rta_buf[flavor-1] = attr;
  1460. }
  1461. attr = RTA_NEXT(attr, attrlen);
  1462. }
  1463. }
  1464. doit = rtnl_get_doit(family, type);
  1465. if (doit == NULL)
  1466. return -EOPNOTSUPP;
  1467. return doit(skb, nlh, (void *)&rta_buf[0]);
  1468. }
  1469. static void rtnetlink_rcv(struct sk_buff *skb)
  1470. {
  1471. rtnl_lock();
  1472. netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
  1473. rtnl_unlock();
  1474. }
  1475. static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
  1476. {
  1477. struct net_device *dev = ptr;
  1478. switch (event) {
  1479. case NETDEV_UP:
  1480. case NETDEV_DOWN:
  1481. case NETDEV_PRE_UP:
  1482. case NETDEV_POST_INIT:
  1483. case NETDEV_REGISTER:
  1484. case NETDEV_CHANGE:
  1485. case NETDEV_PRE_TYPE_CHANGE:
  1486. case NETDEV_GOING_DOWN:
  1487. case NETDEV_UNREGISTER:
  1488. case NETDEV_UNREGISTER_BATCH:
  1489. break;
  1490. default:
  1491. rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
  1492. break;
  1493. }
  1494. return NOTIFY_DONE;
  1495. }
  1496. static struct notifier_block rtnetlink_dev_notifier = {
  1497. .notifier_call = rtnetlink_event,
  1498. };
  1499. static int __net_init rtnetlink_net_init(struct net *net)
  1500. {
  1501. struct sock *sk;
  1502. sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
  1503. rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
  1504. if (!sk)
  1505. return -ENOMEM;
  1506. net->rtnl = sk;
  1507. return 0;
  1508. }
  1509. static void __net_exit rtnetlink_net_exit(struct net *net)
  1510. {
  1511. netlink_kernel_release(net->rtnl);
  1512. net->rtnl = NULL;
  1513. }
  1514. static struct pernet_operations rtnetlink_net_ops = {
  1515. .init = rtnetlink_net_init,
  1516. .exit = rtnetlink_net_exit,
  1517. };
  1518. void __init rtnetlink_init(void)
  1519. {
  1520. int i;
  1521. rtattr_max = 0;
  1522. for (i = 0; i < ARRAY_SIZE(rta_max); i++)
  1523. if (rta_max[i] > rtattr_max)
  1524. rtattr_max = rta_max[i];
  1525. rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
  1526. if (!rta_buf)
  1527. panic("rtnetlink_init: cannot allocate rta_buf\n");
  1528. if (register_pernet_subsys(&rtnetlink_net_ops))
  1529. panic("rtnetlink_init: cannot initialize rtnetlink\n");
  1530. netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
  1531. register_netdevice_notifier(&rtnetlink_dev_notifier);
  1532. rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
  1533. rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
  1534. rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
  1535. rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
  1536. rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
  1537. rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
  1538. }