rtnetlink.c 31 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192119311941195119611971198119912001201120212031204120512061207120812091210121112121213121412151216121712181219122012211222122312241225122612271228122912301231123212331234123512361237123812391240124112421243124412451246124712481249125012511252125312541255125612571258125912601261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306
  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 <asm/uaccess.h>
  38. #include <asm/system.h>
  39. #include <asm/string.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. struct rtnl_link
  52. {
  53. rtnl_doit_func doit;
  54. rtnl_dumpit_func dumpit;
  55. };
  56. static DEFINE_MUTEX(rtnl_mutex);
  57. static struct sock *rtnl;
  58. void rtnl_lock(void)
  59. {
  60. mutex_lock(&rtnl_mutex);
  61. }
  62. void __rtnl_unlock(void)
  63. {
  64. mutex_unlock(&rtnl_mutex);
  65. }
  66. void rtnl_unlock(void)
  67. {
  68. mutex_unlock(&rtnl_mutex);
  69. if (rtnl && rtnl->sk_receive_queue.qlen)
  70. rtnl->sk_data_ready(rtnl, 0);
  71. netdev_run_todo();
  72. }
  73. int rtnl_trylock(void)
  74. {
  75. return mutex_trylock(&rtnl_mutex);
  76. }
  77. int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
  78. {
  79. memset(tb, 0, sizeof(struct rtattr*)*maxattr);
  80. while (RTA_OK(rta, len)) {
  81. unsigned flavor = rta->rta_type;
  82. if (flavor && flavor <= maxattr)
  83. tb[flavor-1] = rta;
  84. rta = RTA_NEXT(rta, len);
  85. }
  86. return 0;
  87. }
  88. static struct rtnl_link *rtnl_msg_handlers[NPROTO];
  89. static inline int rtm_msgindex(int msgtype)
  90. {
  91. int msgindex = msgtype - RTM_BASE;
  92. /*
  93. * msgindex < 0 implies someone tried to register a netlink
  94. * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
  95. * the message type has not been added to linux/rtnetlink.h
  96. */
  97. BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
  98. return msgindex;
  99. }
  100. static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
  101. {
  102. struct rtnl_link *tab;
  103. tab = rtnl_msg_handlers[protocol];
  104. if (tab == NULL || tab[msgindex].doit == NULL)
  105. tab = rtnl_msg_handlers[PF_UNSPEC];
  106. return tab ? tab[msgindex].doit : NULL;
  107. }
  108. static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
  109. {
  110. struct rtnl_link *tab;
  111. tab = rtnl_msg_handlers[protocol];
  112. if (tab == NULL || tab[msgindex].dumpit == NULL)
  113. tab = rtnl_msg_handlers[PF_UNSPEC];
  114. return tab ? tab[msgindex].dumpit : NULL;
  115. }
  116. /**
  117. * __rtnl_register - Register a rtnetlink message type
  118. * @protocol: Protocol family or PF_UNSPEC
  119. * @msgtype: rtnetlink message type
  120. * @doit: Function pointer called for each request message
  121. * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
  122. *
  123. * Registers the specified function pointers (at least one of them has
  124. * to be non-NULL) to be called whenever a request message for the
  125. * specified protocol family and message type is received.
  126. *
  127. * The special protocol family PF_UNSPEC may be used to define fallback
  128. * function pointers for the case when no entry for the specific protocol
  129. * family exists.
  130. *
  131. * Returns 0 on success or a negative error code.
  132. */
  133. int __rtnl_register(int protocol, int msgtype,
  134. rtnl_doit_func doit, rtnl_dumpit_func dumpit)
  135. {
  136. struct rtnl_link *tab;
  137. int msgindex;
  138. BUG_ON(protocol < 0 || protocol >= NPROTO);
  139. msgindex = rtm_msgindex(msgtype);
  140. tab = rtnl_msg_handlers[protocol];
  141. if (tab == NULL) {
  142. tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
  143. if (tab == NULL)
  144. return -ENOBUFS;
  145. rtnl_msg_handlers[protocol] = tab;
  146. }
  147. if (doit)
  148. tab[msgindex].doit = doit;
  149. if (dumpit)
  150. tab[msgindex].dumpit = dumpit;
  151. return 0;
  152. }
  153. EXPORT_SYMBOL_GPL(__rtnl_register);
  154. /**
  155. * rtnl_register - Register a rtnetlink message type
  156. *
  157. * Identical to __rtnl_register() but panics on failure. This is useful
  158. * as failure of this function is very unlikely, it can only happen due
  159. * to lack of memory when allocating the chain to store all message
  160. * handlers for a protocol. Meant for use in init functions where lack
  161. * of memory implies no sense in continueing.
  162. */
  163. void rtnl_register(int protocol, int msgtype,
  164. rtnl_doit_func doit, rtnl_dumpit_func dumpit)
  165. {
  166. if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
  167. panic("Unable to register rtnetlink message handler, "
  168. "protocol = %d, message type = %d\n",
  169. protocol, msgtype);
  170. }
  171. EXPORT_SYMBOL_GPL(rtnl_register);
  172. /**
  173. * rtnl_unregister - Unregister a rtnetlink message type
  174. * @protocol: Protocol family or PF_UNSPEC
  175. * @msgtype: rtnetlink message type
  176. *
  177. * Returns 0 on success or a negative error code.
  178. */
  179. int rtnl_unregister(int protocol, int msgtype)
  180. {
  181. int msgindex;
  182. BUG_ON(protocol < 0 || protocol >= NPROTO);
  183. msgindex = rtm_msgindex(msgtype);
  184. if (rtnl_msg_handlers[protocol] == NULL)
  185. return -ENOENT;
  186. rtnl_msg_handlers[protocol][msgindex].doit = NULL;
  187. rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
  188. return 0;
  189. }
  190. EXPORT_SYMBOL_GPL(rtnl_unregister);
  191. /**
  192. * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
  193. * @protocol : Protocol family or PF_UNSPEC
  194. *
  195. * Identical to calling rtnl_unregster() for all registered message types
  196. * of a certain protocol family.
  197. */
  198. void rtnl_unregister_all(int protocol)
  199. {
  200. BUG_ON(protocol < 0 || protocol >= NPROTO);
  201. kfree(rtnl_msg_handlers[protocol]);
  202. rtnl_msg_handlers[protocol] = NULL;
  203. }
  204. EXPORT_SYMBOL_GPL(rtnl_unregister_all);
  205. static LIST_HEAD(link_ops);
  206. /**
  207. * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
  208. * @ops: struct rtnl_link_ops * to register
  209. *
  210. * The caller must hold the rtnl_mutex. This function should be used
  211. * by drivers that create devices during module initialization. It
  212. * must be called before registering the devices.
  213. *
  214. * Returns 0 on success or a negative error code.
  215. */
  216. int __rtnl_link_register(struct rtnl_link_ops *ops)
  217. {
  218. list_add_tail(&ops->list, &link_ops);
  219. return 0;
  220. }
  221. EXPORT_SYMBOL_GPL(__rtnl_link_register);
  222. /**
  223. * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
  224. * @ops: struct rtnl_link_ops * to register
  225. *
  226. * Returns 0 on success or a negative error code.
  227. */
  228. int rtnl_link_register(struct rtnl_link_ops *ops)
  229. {
  230. int err;
  231. rtnl_lock();
  232. err = __rtnl_link_register(ops);
  233. rtnl_unlock();
  234. return err;
  235. }
  236. EXPORT_SYMBOL_GPL(rtnl_link_register);
  237. /**
  238. * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
  239. * @ops: struct rtnl_link_ops * to unregister
  240. *
  241. * The caller must hold the rtnl_mutex. This function should be used
  242. * by drivers that unregister devices during module unloading. It must
  243. * be called after unregistering the devices.
  244. */
  245. void __rtnl_link_unregister(struct rtnl_link_ops *ops)
  246. {
  247. list_del(&ops->list);
  248. }
  249. EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
  250. /**
  251. * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
  252. * @ops: struct rtnl_link_ops * to unregister
  253. */
  254. void rtnl_link_unregister(struct rtnl_link_ops *ops)
  255. {
  256. rtnl_lock();
  257. __rtnl_link_unregister(ops);
  258. rtnl_unlock();
  259. }
  260. EXPORT_SYMBOL_GPL(rtnl_link_unregister);
  261. static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
  262. {
  263. const struct rtnl_link_ops *ops;
  264. list_for_each_entry(ops, &link_ops, list) {
  265. if (!strcmp(ops->kind, kind))
  266. return ops;
  267. }
  268. return NULL;
  269. }
  270. static size_t rtnl_link_get_size(const struct net_device *dev)
  271. {
  272. const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
  273. size_t size;
  274. if (!ops)
  275. return 0;
  276. size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
  277. nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
  278. if (ops->get_size)
  279. /* IFLA_INFO_DATA + nested data */
  280. size += nlmsg_total_size(sizeof(struct nlattr)) +
  281. ops->get_size(dev);
  282. if (ops->get_xstats_size)
  283. size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
  284. return size;
  285. }
  286. static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
  287. {
  288. const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
  289. struct nlattr *linkinfo, *data;
  290. int err = -EMSGSIZE;
  291. linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
  292. if (linkinfo == NULL)
  293. goto out;
  294. if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
  295. goto err_cancel_link;
  296. if (ops->fill_xstats) {
  297. err = ops->fill_xstats(skb, dev);
  298. if (err < 0)
  299. goto err_cancel_link;
  300. }
  301. if (ops->fill_info) {
  302. data = nla_nest_start(skb, IFLA_INFO_DATA);
  303. if (data == NULL)
  304. goto err_cancel_link;
  305. err = ops->fill_info(skb, dev);
  306. if (err < 0)
  307. goto err_cancel_data;
  308. nla_nest_end(skb, data);
  309. }
  310. nla_nest_end(skb, linkinfo);
  311. return 0;
  312. err_cancel_data:
  313. nla_nest_cancel(skb, data);
  314. err_cancel_link:
  315. nla_nest_cancel(skb, linkinfo);
  316. out:
  317. return err;
  318. }
  319. static const int rtm_min[RTM_NR_FAMILIES] =
  320. {
  321. [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
  322. [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
  323. [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
  324. [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
  325. [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
  326. [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
  327. [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
  328. [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
  329. [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
  330. [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
  331. };
  332. static const int rta_max[RTM_NR_FAMILIES] =
  333. {
  334. [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
  335. [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
  336. [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
  337. [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
  338. [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
  339. [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
  340. [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
  341. [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
  342. };
  343. void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
  344. {
  345. struct rtattr *rta;
  346. int size = RTA_LENGTH(attrlen);
  347. rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
  348. rta->rta_type = attrtype;
  349. rta->rta_len = size;
  350. memcpy(RTA_DATA(rta), data, attrlen);
  351. memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
  352. }
  353. size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
  354. {
  355. size_t ret = RTA_PAYLOAD(rta);
  356. char *src = RTA_DATA(rta);
  357. if (ret > 0 && src[ret - 1] == '\0')
  358. ret--;
  359. if (size > 0) {
  360. size_t len = (ret >= size) ? size - 1 : ret;
  361. memset(dest, 0, size);
  362. memcpy(dest, src, len);
  363. }
  364. return ret;
  365. }
  366. int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
  367. {
  368. int err = 0;
  369. NETLINK_CB(skb).dst_group = group;
  370. if (echo)
  371. atomic_inc(&skb->users);
  372. netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
  373. if (echo)
  374. err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
  375. return err;
  376. }
  377. int rtnl_unicast(struct sk_buff *skb, u32 pid)
  378. {
  379. return nlmsg_unicast(rtnl, skb, pid);
  380. }
  381. int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
  382. struct nlmsghdr *nlh, gfp_t flags)
  383. {
  384. int report = 0;
  385. if (nlh)
  386. report = nlmsg_report(nlh);
  387. return nlmsg_notify(rtnl, skb, pid, group, report, flags);
  388. }
  389. void rtnl_set_sk_err(u32 group, int error)
  390. {
  391. netlink_set_err(rtnl, 0, group, error);
  392. }
  393. int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
  394. {
  395. struct nlattr *mx;
  396. int i, valid = 0;
  397. mx = nla_nest_start(skb, RTA_METRICS);
  398. if (mx == NULL)
  399. return -ENOBUFS;
  400. for (i = 0; i < RTAX_MAX; i++) {
  401. if (metrics[i]) {
  402. valid++;
  403. NLA_PUT_U32(skb, i+1, metrics[i]);
  404. }
  405. }
  406. if (!valid) {
  407. nla_nest_cancel(skb, mx);
  408. return 0;
  409. }
  410. return nla_nest_end(skb, mx);
  411. nla_put_failure:
  412. return nla_nest_cancel(skb, mx);
  413. }
  414. int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
  415. u32 ts, u32 tsage, long expires, u32 error)
  416. {
  417. struct rta_cacheinfo ci = {
  418. .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
  419. .rta_used = dst->__use,
  420. .rta_clntref = atomic_read(&(dst->__refcnt)),
  421. .rta_error = error,
  422. .rta_id = id,
  423. .rta_ts = ts,
  424. .rta_tsage = tsage,
  425. };
  426. if (expires)
  427. ci.rta_expires = jiffies_to_clock_t(expires);
  428. return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
  429. }
  430. EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
  431. static void set_operstate(struct net_device *dev, unsigned char transition)
  432. {
  433. unsigned char operstate = dev->operstate;
  434. switch(transition) {
  435. case IF_OPER_UP:
  436. if ((operstate == IF_OPER_DORMANT ||
  437. operstate == IF_OPER_UNKNOWN) &&
  438. !netif_dormant(dev))
  439. operstate = IF_OPER_UP;
  440. break;
  441. case IF_OPER_DORMANT:
  442. if (operstate == IF_OPER_UP ||
  443. operstate == IF_OPER_UNKNOWN)
  444. operstate = IF_OPER_DORMANT;
  445. break;
  446. }
  447. if (dev->operstate != operstate) {
  448. write_lock_bh(&dev_base_lock);
  449. dev->operstate = operstate;
  450. write_unlock_bh(&dev_base_lock);
  451. netdev_state_change(dev);
  452. }
  453. }
  454. static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
  455. struct net_device_stats *b)
  456. {
  457. a->rx_packets = b->rx_packets;
  458. a->tx_packets = b->tx_packets;
  459. a->rx_bytes = b->rx_bytes;
  460. a->tx_bytes = b->tx_bytes;
  461. a->rx_errors = b->rx_errors;
  462. a->tx_errors = b->tx_errors;
  463. a->rx_dropped = b->rx_dropped;
  464. a->tx_dropped = b->tx_dropped;
  465. a->multicast = b->multicast;
  466. a->collisions = b->collisions;
  467. a->rx_length_errors = b->rx_length_errors;
  468. a->rx_over_errors = b->rx_over_errors;
  469. a->rx_crc_errors = b->rx_crc_errors;
  470. a->rx_frame_errors = b->rx_frame_errors;
  471. a->rx_fifo_errors = b->rx_fifo_errors;
  472. a->rx_missed_errors = b->rx_missed_errors;
  473. a->tx_aborted_errors = b->tx_aborted_errors;
  474. a->tx_carrier_errors = b->tx_carrier_errors;
  475. a->tx_fifo_errors = b->tx_fifo_errors;
  476. a->tx_heartbeat_errors = b->tx_heartbeat_errors;
  477. a->tx_window_errors = b->tx_window_errors;
  478. a->rx_compressed = b->rx_compressed;
  479. a->tx_compressed = b->tx_compressed;
  480. };
  481. static inline size_t if_nlmsg_size(const struct net_device *dev)
  482. {
  483. return NLMSG_ALIGN(sizeof(struct ifinfomsg))
  484. + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
  485. + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
  486. + nla_total_size(sizeof(struct rtnl_link_ifmap))
  487. + nla_total_size(sizeof(struct rtnl_link_stats))
  488. + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
  489. + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
  490. + nla_total_size(4) /* IFLA_TXQLEN */
  491. + nla_total_size(4) /* IFLA_WEIGHT */
  492. + nla_total_size(4) /* IFLA_MTU */
  493. + nla_total_size(4) /* IFLA_LINK */
  494. + nla_total_size(4) /* IFLA_MASTER */
  495. + nla_total_size(1) /* IFLA_OPERSTATE */
  496. + nla_total_size(1) /* IFLA_LINKMODE */
  497. + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
  498. }
  499. static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
  500. int type, u32 pid, u32 seq, u32 change,
  501. unsigned int flags)
  502. {
  503. struct ifinfomsg *ifm;
  504. struct nlmsghdr *nlh;
  505. nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
  506. if (nlh == NULL)
  507. return -EMSGSIZE;
  508. ifm = nlmsg_data(nlh);
  509. ifm->ifi_family = AF_UNSPEC;
  510. ifm->__ifi_pad = 0;
  511. ifm->ifi_type = dev->type;
  512. ifm->ifi_index = dev->ifindex;
  513. ifm->ifi_flags = dev_get_flags(dev);
  514. ifm->ifi_change = change;
  515. NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
  516. NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
  517. NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
  518. NLA_PUT_U8(skb, IFLA_OPERSTATE,
  519. netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
  520. NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
  521. NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
  522. if (dev->ifindex != dev->iflink)
  523. NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
  524. if (dev->master)
  525. NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
  526. if (dev->qdisc_sleeping)
  527. NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
  528. if (1) {
  529. struct rtnl_link_ifmap map = {
  530. .mem_start = dev->mem_start,
  531. .mem_end = dev->mem_end,
  532. .base_addr = dev->base_addr,
  533. .irq = dev->irq,
  534. .dma = dev->dma,
  535. .port = dev->if_port,
  536. };
  537. NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
  538. }
  539. if (dev->addr_len) {
  540. NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
  541. NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
  542. }
  543. if (dev->get_stats) {
  544. struct net_device_stats *stats = dev->get_stats(dev);
  545. if (stats) {
  546. struct nlattr *attr;
  547. attr = nla_reserve(skb, IFLA_STATS,
  548. sizeof(struct rtnl_link_stats));
  549. if (attr == NULL)
  550. goto nla_put_failure;
  551. copy_rtnl_link_stats(nla_data(attr), stats);
  552. }
  553. }
  554. if (dev->rtnl_link_ops) {
  555. if (rtnl_link_fill(skb, dev) < 0)
  556. goto nla_put_failure;
  557. }
  558. return nlmsg_end(skb, nlh);
  559. nla_put_failure:
  560. nlmsg_cancel(skb, nlh);
  561. return -EMSGSIZE;
  562. }
  563. static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
  564. {
  565. int idx;
  566. int s_idx = cb->args[0];
  567. struct net_device *dev;
  568. idx = 0;
  569. for_each_netdev(dev) {
  570. if (idx < s_idx)
  571. goto cont;
  572. if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
  573. NETLINK_CB(cb->skb).pid,
  574. cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
  575. break;
  576. cont:
  577. idx++;
  578. }
  579. cb->args[0] = idx;
  580. return skb->len;
  581. }
  582. static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
  583. [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
  584. [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
  585. [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
  586. [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
  587. [IFLA_MTU] = { .type = NLA_U32 },
  588. [IFLA_TXQLEN] = { .type = NLA_U32 },
  589. [IFLA_WEIGHT] = { .type = NLA_U32 },
  590. [IFLA_OPERSTATE] = { .type = NLA_U8 },
  591. [IFLA_LINKMODE] = { .type = NLA_U8 },
  592. };
  593. static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
  594. [IFLA_INFO_KIND] = { .type = NLA_STRING },
  595. [IFLA_INFO_DATA] = { .type = NLA_NESTED },
  596. };
  597. static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
  598. struct nlattr **tb, char *ifname, int modified)
  599. {
  600. int send_addr_notify = 0;
  601. int err;
  602. if (tb[IFLA_MAP]) {
  603. struct rtnl_link_ifmap *u_map;
  604. struct ifmap k_map;
  605. if (!dev->set_config) {
  606. err = -EOPNOTSUPP;
  607. goto errout;
  608. }
  609. if (!netif_device_present(dev)) {
  610. err = -ENODEV;
  611. goto errout;
  612. }
  613. u_map = nla_data(tb[IFLA_MAP]);
  614. k_map.mem_start = (unsigned long) u_map->mem_start;
  615. k_map.mem_end = (unsigned long) u_map->mem_end;
  616. k_map.base_addr = (unsigned short) u_map->base_addr;
  617. k_map.irq = (unsigned char) u_map->irq;
  618. k_map.dma = (unsigned char) u_map->dma;
  619. k_map.port = (unsigned char) u_map->port;
  620. err = dev->set_config(dev, &k_map);
  621. if (err < 0)
  622. goto errout;
  623. modified = 1;
  624. }
  625. if (tb[IFLA_ADDRESS]) {
  626. struct sockaddr *sa;
  627. int len;
  628. if (!dev->set_mac_address) {
  629. err = -EOPNOTSUPP;
  630. goto errout;
  631. }
  632. if (!netif_device_present(dev)) {
  633. err = -ENODEV;
  634. goto errout;
  635. }
  636. len = sizeof(sa_family_t) + dev->addr_len;
  637. sa = kmalloc(len, GFP_KERNEL);
  638. if (!sa) {
  639. err = -ENOMEM;
  640. goto errout;
  641. }
  642. sa->sa_family = dev->type;
  643. memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
  644. dev->addr_len);
  645. err = dev->set_mac_address(dev, sa);
  646. kfree(sa);
  647. if (err)
  648. goto errout;
  649. send_addr_notify = 1;
  650. modified = 1;
  651. }
  652. if (tb[IFLA_MTU]) {
  653. err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
  654. if (err < 0)
  655. goto errout;
  656. modified = 1;
  657. }
  658. /*
  659. * Interface selected by interface index but interface
  660. * name provided implies that a name change has been
  661. * requested.
  662. */
  663. if (ifm->ifi_index > 0 && ifname[0]) {
  664. err = dev_change_name(dev, ifname);
  665. if (err < 0)
  666. goto errout;
  667. modified = 1;
  668. }
  669. if (tb[IFLA_BROADCAST]) {
  670. nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
  671. send_addr_notify = 1;
  672. }
  673. if (ifm->ifi_flags || ifm->ifi_change) {
  674. unsigned int flags = ifm->ifi_flags;
  675. /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
  676. if (ifm->ifi_change)
  677. flags = (flags & ifm->ifi_change) |
  678. (dev->flags & ~ifm->ifi_change);
  679. dev_change_flags(dev, flags);
  680. }
  681. if (tb[IFLA_TXQLEN])
  682. dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
  683. if (tb[IFLA_WEIGHT])
  684. dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
  685. if (tb[IFLA_OPERSTATE])
  686. set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
  687. if (tb[IFLA_LINKMODE]) {
  688. write_lock_bh(&dev_base_lock);
  689. dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
  690. write_unlock_bh(&dev_base_lock);
  691. }
  692. err = 0;
  693. errout:
  694. if (err < 0 && modified && net_ratelimit())
  695. printk(KERN_WARNING "A link change request failed with "
  696. "some changes comitted already. Interface %s may "
  697. "have been left with an inconsistent configuration, "
  698. "please check.\n", dev->name);
  699. if (send_addr_notify)
  700. call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
  701. return err;
  702. }
  703. static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
  704. {
  705. struct ifinfomsg *ifm;
  706. struct net_device *dev;
  707. int err;
  708. struct nlattr *tb[IFLA_MAX+1];
  709. char ifname[IFNAMSIZ];
  710. err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
  711. if (err < 0)
  712. goto errout;
  713. if (tb[IFLA_IFNAME])
  714. nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
  715. else
  716. ifname[0] = '\0';
  717. err = -EINVAL;
  718. ifm = nlmsg_data(nlh);
  719. if (ifm->ifi_index > 0)
  720. dev = dev_get_by_index(ifm->ifi_index);
  721. else if (tb[IFLA_IFNAME])
  722. dev = dev_get_by_name(ifname);
  723. else
  724. goto errout;
  725. if (dev == NULL) {
  726. err = -ENODEV;
  727. goto errout;
  728. }
  729. if (tb[IFLA_ADDRESS] &&
  730. nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
  731. goto errout_dev;
  732. if (tb[IFLA_BROADCAST] &&
  733. nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
  734. goto errout_dev;
  735. err = do_setlink(dev, ifm, tb, ifname, 0);
  736. errout_dev:
  737. dev_put(dev);
  738. errout:
  739. return err;
  740. }
  741. static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
  742. {
  743. const struct rtnl_link_ops *ops;
  744. struct net_device *dev;
  745. struct ifinfomsg *ifm;
  746. char ifname[IFNAMSIZ];
  747. struct nlattr *tb[IFLA_MAX+1];
  748. int err;
  749. err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
  750. if (err < 0)
  751. return err;
  752. if (tb[IFLA_IFNAME])
  753. nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
  754. ifm = nlmsg_data(nlh);
  755. if (ifm->ifi_index > 0)
  756. dev = __dev_get_by_index(ifm->ifi_index);
  757. else if (tb[IFLA_IFNAME])
  758. dev = __dev_get_by_name(ifname);
  759. else
  760. return -EINVAL;
  761. if (!dev)
  762. return -ENODEV;
  763. ops = dev->rtnl_link_ops;
  764. if (!ops)
  765. return -EOPNOTSUPP;
  766. ops->dellink(dev);
  767. return 0;
  768. }
  769. static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
  770. {
  771. const struct rtnl_link_ops *ops;
  772. struct net_device *dev;
  773. struct ifinfomsg *ifm;
  774. char kind[MODULE_NAME_LEN];
  775. char ifname[IFNAMSIZ];
  776. struct nlattr *tb[IFLA_MAX+1];
  777. struct nlattr *linkinfo[IFLA_INFO_MAX+1];
  778. int err;
  779. replay:
  780. err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
  781. if (err < 0)
  782. return err;
  783. if (tb[IFLA_IFNAME])
  784. nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
  785. else
  786. ifname[0] = '\0';
  787. ifm = nlmsg_data(nlh);
  788. if (ifm->ifi_index > 0)
  789. dev = __dev_get_by_index(ifm->ifi_index);
  790. else if (ifname[0])
  791. dev = __dev_get_by_name(ifname);
  792. else
  793. dev = NULL;
  794. if (tb[IFLA_LINKINFO]) {
  795. err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
  796. tb[IFLA_LINKINFO], ifla_info_policy);
  797. if (err < 0)
  798. return err;
  799. } else
  800. memset(linkinfo, 0, sizeof(linkinfo));
  801. if (linkinfo[IFLA_INFO_KIND]) {
  802. nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
  803. ops = rtnl_link_ops_get(kind);
  804. } else {
  805. kind[0] = '\0';
  806. ops = NULL;
  807. }
  808. if (1) {
  809. struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
  810. if (ops) {
  811. if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
  812. err = nla_parse_nested(attr, ops->maxtype,
  813. linkinfo[IFLA_INFO_DATA],
  814. ops->policy);
  815. if (err < 0)
  816. return err;
  817. data = attr;
  818. }
  819. if (ops->validate) {
  820. err = ops->validate(tb, data);
  821. if (err < 0)
  822. return err;
  823. }
  824. }
  825. if (dev) {
  826. int modified = 0;
  827. if (nlh->nlmsg_flags & NLM_F_EXCL)
  828. return -EEXIST;
  829. if (nlh->nlmsg_flags & NLM_F_REPLACE)
  830. return -EOPNOTSUPP;
  831. if (linkinfo[IFLA_INFO_DATA]) {
  832. if (!ops || ops != dev->rtnl_link_ops ||
  833. !ops->changelink)
  834. return -EOPNOTSUPP;
  835. err = ops->changelink(dev, tb, data);
  836. if (err < 0)
  837. return err;
  838. modified = 1;
  839. }
  840. return do_setlink(dev, ifm, tb, ifname, modified);
  841. }
  842. if (!(nlh->nlmsg_flags & NLM_F_CREATE))
  843. return -ENODEV;
  844. if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
  845. return -EOPNOTSUPP;
  846. if (tb[IFLA_ADDRESS] || tb[IFLA_BROADCAST] || tb[IFLA_MAP] ||
  847. tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
  848. return -EOPNOTSUPP;
  849. if (!ops) {
  850. #ifdef CONFIG_KMOD
  851. if (kind[0]) {
  852. __rtnl_unlock();
  853. request_module("rtnl-link-%s", kind);
  854. rtnl_lock();
  855. ops = rtnl_link_ops_get(kind);
  856. if (ops)
  857. goto replay;
  858. }
  859. #endif
  860. return -EOPNOTSUPP;
  861. }
  862. if (!ifname[0])
  863. snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
  864. dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
  865. if (!dev)
  866. return -ENOMEM;
  867. if (strchr(dev->name, '%')) {
  868. err = dev_alloc_name(dev, dev->name);
  869. if (err < 0)
  870. goto err_free;
  871. }
  872. dev->rtnl_link_ops = ops;
  873. if (tb[IFLA_MTU])
  874. dev->mtu = nla_get_u32(tb[IFLA_MTU]);
  875. if (tb[IFLA_TXQLEN])
  876. dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
  877. if (tb[IFLA_WEIGHT])
  878. dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
  879. if (tb[IFLA_OPERSTATE])
  880. set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
  881. if (tb[IFLA_LINKMODE])
  882. dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
  883. err = ops->newlink(dev, tb, data);
  884. err_free:
  885. if (err < 0)
  886. free_netdev(dev);
  887. return err;
  888. }
  889. }
  890. static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
  891. {
  892. struct ifinfomsg *ifm;
  893. struct nlattr *tb[IFLA_MAX+1];
  894. struct net_device *dev = NULL;
  895. struct sk_buff *nskb;
  896. int err;
  897. err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
  898. if (err < 0)
  899. return err;
  900. ifm = nlmsg_data(nlh);
  901. if (ifm->ifi_index > 0) {
  902. dev = dev_get_by_index(ifm->ifi_index);
  903. if (dev == NULL)
  904. return -ENODEV;
  905. } else
  906. return -EINVAL;
  907. nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
  908. if (nskb == NULL) {
  909. err = -ENOBUFS;
  910. goto errout;
  911. }
  912. err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
  913. nlh->nlmsg_seq, 0, 0);
  914. if (err < 0) {
  915. /* -EMSGSIZE implies BUG in if_nlmsg_size */
  916. WARN_ON(err == -EMSGSIZE);
  917. kfree_skb(nskb);
  918. goto errout;
  919. }
  920. err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
  921. errout:
  922. dev_put(dev);
  923. return err;
  924. }
  925. static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
  926. {
  927. int idx;
  928. int s_idx = cb->family;
  929. if (s_idx == 0)
  930. s_idx = 1;
  931. for (idx=1; idx<NPROTO; idx++) {
  932. int type = cb->nlh->nlmsg_type-RTM_BASE;
  933. if (idx < s_idx || idx == PF_PACKET)
  934. continue;
  935. if (rtnl_msg_handlers[idx] == NULL ||
  936. rtnl_msg_handlers[idx][type].dumpit == NULL)
  937. continue;
  938. if (idx > s_idx)
  939. memset(&cb->args[0], 0, sizeof(cb->args));
  940. if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
  941. break;
  942. }
  943. cb->family = idx;
  944. return skb->len;
  945. }
  946. void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
  947. {
  948. struct sk_buff *skb;
  949. int err = -ENOBUFS;
  950. skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
  951. if (skb == NULL)
  952. goto errout;
  953. err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
  954. if (err < 0) {
  955. /* -EMSGSIZE implies BUG in if_nlmsg_size() */
  956. WARN_ON(err == -EMSGSIZE);
  957. kfree_skb(skb);
  958. goto errout;
  959. }
  960. err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
  961. errout:
  962. if (err < 0)
  963. rtnl_set_sk_err(RTNLGRP_LINK, err);
  964. }
  965. /* Protected by RTNL sempahore. */
  966. static struct rtattr **rta_buf;
  967. static int rtattr_max;
  968. /* Process one rtnetlink message. */
  969. static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
  970. {
  971. rtnl_doit_func doit;
  972. int sz_idx, kind;
  973. int min_len;
  974. int family;
  975. int type;
  976. int err;
  977. type = nlh->nlmsg_type;
  978. if (type > RTM_MAX)
  979. return -EOPNOTSUPP;
  980. type -= RTM_BASE;
  981. /* All the messages must have at least 1 byte length */
  982. if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
  983. return 0;
  984. family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
  985. if (family >= NPROTO)
  986. return -EAFNOSUPPORT;
  987. sz_idx = type>>2;
  988. kind = type&3;
  989. if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
  990. return -EPERM;
  991. if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
  992. rtnl_dumpit_func dumpit;
  993. dumpit = rtnl_get_dumpit(family, type);
  994. if (dumpit == NULL)
  995. return -EOPNOTSUPP;
  996. __rtnl_unlock();
  997. err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
  998. rtnl_lock();
  999. return err;
  1000. }
  1001. memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
  1002. min_len = rtm_min[sz_idx];
  1003. if (nlh->nlmsg_len < min_len)
  1004. return -EINVAL;
  1005. if (nlh->nlmsg_len > min_len) {
  1006. int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
  1007. struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
  1008. while (RTA_OK(attr, attrlen)) {
  1009. unsigned flavor = attr->rta_type;
  1010. if (flavor) {
  1011. if (flavor > rta_max[sz_idx])
  1012. return -EINVAL;
  1013. rta_buf[flavor-1] = attr;
  1014. }
  1015. attr = RTA_NEXT(attr, attrlen);
  1016. }
  1017. }
  1018. doit = rtnl_get_doit(family, type);
  1019. if (doit == NULL)
  1020. return -EOPNOTSUPP;
  1021. return doit(skb, nlh, (void *)&rta_buf[0]);
  1022. }
  1023. static void rtnetlink_rcv(struct sock *sk, int len)
  1024. {
  1025. unsigned int qlen = 0;
  1026. do {
  1027. mutex_lock(&rtnl_mutex);
  1028. netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
  1029. mutex_unlock(&rtnl_mutex);
  1030. netdev_run_todo();
  1031. } while (qlen);
  1032. }
  1033. static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
  1034. {
  1035. struct net_device *dev = ptr;
  1036. switch (event) {
  1037. case NETDEV_UNREGISTER:
  1038. rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
  1039. break;
  1040. case NETDEV_REGISTER:
  1041. rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
  1042. break;
  1043. case NETDEV_UP:
  1044. case NETDEV_DOWN:
  1045. rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
  1046. break;
  1047. case NETDEV_CHANGE:
  1048. case NETDEV_GOING_DOWN:
  1049. break;
  1050. default:
  1051. rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
  1052. break;
  1053. }
  1054. return NOTIFY_DONE;
  1055. }
  1056. static struct notifier_block rtnetlink_dev_notifier = {
  1057. .notifier_call = rtnetlink_event,
  1058. };
  1059. void __init rtnetlink_init(void)
  1060. {
  1061. int i;
  1062. rtattr_max = 0;
  1063. for (i = 0; i < ARRAY_SIZE(rta_max); i++)
  1064. if (rta_max[i] > rtattr_max)
  1065. rtattr_max = rta_max[i];
  1066. rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
  1067. if (!rta_buf)
  1068. panic("rtnetlink_init: cannot allocate rta_buf\n");
  1069. rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
  1070. &rtnl_mutex, THIS_MODULE);
  1071. if (rtnl == NULL)
  1072. panic("rtnetlink_init: cannot initialize rtnetlink\n");
  1073. netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
  1074. register_netdevice_notifier(&rtnetlink_dev_notifier);
  1075. rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
  1076. rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
  1077. rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
  1078. rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
  1079. rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
  1080. rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
  1081. }
  1082. EXPORT_SYMBOL(__rta_fill);
  1083. EXPORT_SYMBOL(rtattr_strlcpy);
  1084. EXPORT_SYMBOL(rtattr_parse);
  1085. EXPORT_SYMBOL(rtnetlink_put_metrics);
  1086. EXPORT_SYMBOL(rtnl_lock);
  1087. EXPORT_SYMBOL(rtnl_trylock);
  1088. EXPORT_SYMBOL(rtnl_unlock);
  1089. EXPORT_SYMBOL(rtnl_unicast);
  1090. EXPORT_SYMBOL(rtnl_notify);
  1091. EXPORT_SYMBOL(rtnl_set_sk_err);