inet_diag.c 28 KB

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  1. /*
  2. * inet_diag.c Module for monitoring INET transport protocols sockets.
  3. *
  4. * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  5. *
  6. * This program is free software; you can redistribute it and/or
  7. * modify it under the terms of the GNU General Public License
  8. * as published by the Free Software Foundation; either version
  9. * 2 of the License, or (at your option) any later version.
  10. */
  11. #include <linux/kernel.h>
  12. #include <linux/module.h>
  13. #include <linux/types.h>
  14. #include <linux/fcntl.h>
  15. #include <linux/random.h>
  16. #include <linux/slab.h>
  17. #include <linux/cache.h>
  18. #include <linux/init.h>
  19. #include <linux/time.h>
  20. #include <net/icmp.h>
  21. #include <net/tcp.h>
  22. #include <net/ipv6.h>
  23. #include <net/inet_common.h>
  24. #include <net/inet_connection_sock.h>
  25. #include <net/inet_hashtables.h>
  26. #include <net/inet_timewait_sock.h>
  27. #include <net/inet6_hashtables.h>
  28. #include <net/netlink.h>
  29. #include <linux/inet.h>
  30. #include <linux/stddef.h>
  31. #include <linux/inet_diag.h>
  32. #include <linux/sock_diag.h>
  33. static const struct inet_diag_handler **inet_diag_table;
  34. struct inet_diag_entry {
  35. __be32 *saddr;
  36. __be32 *daddr;
  37. u16 sport;
  38. u16 dport;
  39. u16 family;
  40. u16 userlocks;
  41. #if IS_ENABLED(CONFIG_IPV6)
  42. struct in6_addr saddr_storage; /* for IPv4-mapped-IPv6 addresses */
  43. struct in6_addr daddr_storage; /* for IPv4-mapped-IPv6 addresses */
  44. #endif
  45. };
  46. static DEFINE_MUTEX(inet_diag_table_mutex);
  47. static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  48. {
  49. if (!inet_diag_table[proto])
  50. request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
  51. NETLINK_SOCK_DIAG, AF_INET, proto);
  52. mutex_lock(&inet_diag_table_mutex);
  53. if (!inet_diag_table[proto])
  54. return ERR_PTR(-ENOENT);
  55. return inet_diag_table[proto];
  56. }
  57. static inline void inet_diag_unlock_handler(
  58. const struct inet_diag_handler *handler)
  59. {
  60. mutex_unlock(&inet_diag_table_mutex);
  61. }
  62. int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
  63. struct sk_buff *skb, struct inet_diag_req_v2 *req,
  64. struct user_namespace *user_ns,
  65. u32 portid, u32 seq, u16 nlmsg_flags,
  66. const struct nlmsghdr *unlh)
  67. {
  68. const struct inet_sock *inet = inet_sk(sk);
  69. struct inet_diag_msg *r;
  70. struct nlmsghdr *nlh;
  71. struct nlattr *attr;
  72. void *info = NULL;
  73. const struct inet_diag_handler *handler;
  74. int ext = req->idiag_ext;
  75. handler = inet_diag_table[req->sdiag_protocol];
  76. BUG_ON(handler == NULL);
  77. nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
  78. nlmsg_flags);
  79. if (!nlh)
  80. return -EMSGSIZE;
  81. r = nlmsg_data(nlh);
  82. BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  83. r->idiag_family = sk->sk_family;
  84. r->idiag_state = sk->sk_state;
  85. r->idiag_timer = 0;
  86. r->idiag_retrans = 0;
  87. r->id.idiag_if = sk->sk_bound_dev_if;
  88. sock_diag_save_cookie(sk, r->id.idiag_cookie);
  89. r->id.idiag_sport = inet->inet_sport;
  90. r->id.idiag_dport = inet->inet_dport;
  91. r->id.idiag_src[0] = inet->inet_rcv_saddr;
  92. r->id.idiag_dst[0] = inet->inet_daddr;
  93. if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
  94. goto errout;
  95. /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
  96. * hence this needs to be included regardless of socket family.
  97. */
  98. if (ext & (1 << (INET_DIAG_TOS - 1)))
  99. if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
  100. goto errout;
  101. #if IS_ENABLED(CONFIG_IPV6)
  102. if (r->idiag_family == AF_INET6) {
  103. *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
  104. *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
  105. if (ext & (1 << (INET_DIAG_TCLASS - 1)))
  106. if (nla_put_u8(skb, INET_DIAG_TCLASS,
  107. inet6_sk(sk)->tclass) < 0)
  108. goto errout;
  109. }
  110. #endif
  111. r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
  112. r->idiag_inode = sock_i_ino(sk);
  113. if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
  114. struct inet_diag_meminfo minfo = {
  115. .idiag_rmem = sk_rmem_alloc_get(sk),
  116. .idiag_wmem = sk->sk_wmem_queued,
  117. .idiag_fmem = sk->sk_forward_alloc,
  118. .idiag_tmem = sk_wmem_alloc_get(sk),
  119. };
  120. if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
  121. goto errout;
  122. }
  123. if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
  124. if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
  125. goto errout;
  126. if (icsk == NULL) {
  127. handler->idiag_get_info(sk, r, NULL);
  128. goto out;
  129. }
  130. #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
  131. if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
  132. icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
  133. icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
  134. r->idiag_timer = 1;
  135. r->idiag_retrans = icsk->icsk_retransmits;
  136. r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
  137. } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
  138. r->idiag_timer = 4;
  139. r->idiag_retrans = icsk->icsk_probes_out;
  140. r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
  141. } else if (timer_pending(&sk->sk_timer)) {
  142. r->idiag_timer = 2;
  143. r->idiag_retrans = icsk->icsk_probes_out;
  144. r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
  145. } else {
  146. r->idiag_timer = 0;
  147. r->idiag_expires = 0;
  148. }
  149. #undef EXPIRES_IN_MS
  150. if (ext & (1 << (INET_DIAG_INFO - 1))) {
  151. attr = nla_reserve(skb, INET_DIAG_INFO,
  152. sizeof(struct tcp_info));
  153. if (!attr)
  154. goto errout;
  155. info = nla_data(attr);
  156. }
  157. if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
  158. if (nla_put_string(skb, INET_DIAG_CONG,
  159. icsk->icsk_ca_ops->name) < 0)
  160. goto errout;
  161. handler->idiag_get_info(sk, r, info);
  162. if (sk->sk_state < TCP_TIME_WAIT &&
  163. icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
  164. icsk->icsk_ca_ops->get_info(sk, ext, skb);
  165. out:
  166. return nlmsg_end(skb, nlh);
  167. errout:
  168. nlmsg_cancel(skb, nlh);
  169. return -EMSGSIZE;
  170. }
  171. EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
  172. static int inet_csk_diag_fill(struct sock *sk,
  173. struct sk_buff *skb, struct inet_diag_req_v2 *req,
  174. struct user_namespace *user_ns,
  175. u32 portid, u32 seq, u16 nlmsg_flags,
  176. const struct nlmsghdr *unlh)
  177. {
  178. return inet_sk_diag_fill(sk, inet_csk(sk),
  179. skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
  180. }
  181. static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
  182. struct sk_buff *skb, struct inet_diag_req_v2 *req,
  183. u32 portid, u32 seq, u16 nlmsg_flags,
  184. const struct nlmsghdr *unlh)
  185. {
  186. s32 tmo;
  187. struct inet_diag_msg *r;
  188. struct nlmsghdr *nlh;
  189. nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
  190. nlmsg_flags);
  191. if (!nlh)
  192. return -EMSGSIZE;
  193. r = nlmsg_data(nlh);
  194. BUG_ON(tw->tw_state != TCP_TIME_WAIT);
  195. tmo = tw->tw_ttd - inet_tw_time_stamp();
  196. if (tmo < 0)
  197. tmo = 0;
  198. r->idiag_family = tw->tw_family;
  199. r->idiag_retrans = 0;
  200. r->id.idiag_if = tw->tw_bound_dev_if;
  201. sock_diag_save_cookie(tw, r->id.idiag_cookie);
  202. r->id.idiag_sport = tw->tw_sport;
  203. r->id.idiag_dport = tw->tw_dport;
  204. r->id.idiag_src[0] = tw->tw_rcv_saddr;
  205. r->id.idiag_dst[0] = tw->tw_daddr;
  206. r->idiag_state = tw->tw_substate;
  207. r->idiag_timer = 3;
  208. r->idiag_expires = jiffies_to_msecs(tmo);
  209. r->idiag_rqueue = 0;
  210. r->idiag_wqueue = 0;
  211. r->idiag_uid = 0;
  212. r->idiag_inode = 0;
  213. #if IS_ENABLED(CONFIG_IPV6)
  214. if (tw->tw_family == AF_INET6) {
  215. *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
  216. *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
  217. }
  218. #endif
  219. return nlmsg_end(skb, nlh);
  220. }
  221. static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
  222. struct inet_diag_req_v2 *r,
  223. struct user_namespace *user_ns,
  224. u32 portid, u32 seq, u16 nlmsg_flags,
  225. const struct nlmsghdr *unlh)
  226. {
  227. if (sk->sk_state == TCP_TIME_WAIT)
  228. return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
  229. nlmsg_flags, unlh);
  230. return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
  231. nlmsg_flags, unlh);
  232. }
  233. int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
  234. const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
  235. {
  236. int err;
  237. struct sock *sk;
  238. struct sk_buff *rep;
  239. struct net *net = sock_net(in_skb->sk);
  240. err = -EINVAL;
  241. if (req->sdiag_family == AF_INET) {
  242. sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
  243. req->id.idiag_dport, req->id.idiag_src[0],
  244. req->id.idiag_sport, req->id.idiag_if);
  245. }
  246. #if IS_ENABLED(CONFIG_IPV6)
  247. else if (req->sdiag_family == AF_INET6) {
  248. sk = inet6_lookup(net, hashinfo,
  249. (struct in6_addr *)req->id.idiag_dst,
  250. req->id.idiag_dport,
  251. (struct in6_addr *)req->id.idiag_src,
  252. req->id.idiag_sport,
  253. req->id.idiag_if);
  254. }
  255. #endif
  256. else {
  257. goto out_nosk;
  258. }
  259. err = -ENOENT;
  260. if (sk == NULL)
  261. goto out_nosk;
  262. err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
  263. if (err)
  264. goto out;
  265. rep = nlmsg_new(sizeof(struct inet_diag_msg) +
  266. sizeof(struct inet_diag_meminfo) +
  267. sizeof(struct tcp_info) + 64, GFP_KERNEL);
  268. if (!rep) {
  269. err = -ENOMEM;
  270. goto out;
  271. }
  272. err = sk_diag_fill(sk, rep, req,
  273. sk_user_ns(NETLINK_CB(in_skb).sk),
  274. NETLINK_CB(in_skb).portid,
  275. nlh->nlmsg_seq, 0, nlh);
  276. if (err < 0) {
  277. WARN_ON(err == -EMSGSIZE);
  278. nlmsg_free(rep);
  279. goto out;
  280. }
  281. err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
  282. MSG_DONTWAIT);
  283. if (err > 0)
  284. err = 0;
  285. out:
  286. if (sk)
  287. sock_gen_put(sk);
  288. out_nosk:
  289. return err;
  290. }
  291. EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
  292. static int inet_diag_get_exact(struct sk_buff *in_skb,
  293. const struct nlmsghdr *nlh,
  294. struct inet_diag_req_v2 *req)
  295. {
  296. const struct inet_diag_handler *handler;
  297. int err;
  298. handler = inet_diag_lock_handler(req->sdiag_protocol);
  299. if (IS_ERR(handler))
  300. err = PTR_ERR(handler);
  301. else
  302. err = handler->dump_one(in_skb, nlh, req);
  303. inet_diag_unlock_handler(handler);
  304. return err;
  305. }
  306. static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
  307. {
  308. int words = bits >> 5;
  309. bits &= 0x1f;
  310. if (words) {
  311. if (memcmp(a1, a2, words << 2))
  312. return 0;
  313. }
  314. if (bits) {
  315. __be32 w1, w2;
  316. __be32 mask;
  317. w1 = a1[words];
  318. w2 = a2[words];
  319. mask = htonl((0xffffffff) << (32 - bits));
  320. if ((w1 ^ w2) & mask)
  321. return 0;
  322. }
  323. return 1;
  324. }
  325. static int inet_diag_bc_run(const struct nlattr *_bc,
  326. const struct inet_diag_entry *entry)
  327. {
  328. const void *bc = nla_data(_bc);
  329. int len = nla_len(_bc);
  330. while (len > 0) {
  331. int yes = 1;
  332. const struct inet_diag_bc_op *op = bc;
  333. switch (op->code) {
  334. case INET_DIAG_BC_NOP:
  335. break;
  336. case INET_DIAG_BC_JMP:
  337. yes = 0;
  338. break;
  339. case INET_DIAG_BC_S_GE:
  340. yes = entry->sport >= op[1].no;
  341. break;
  342. case INET_DIAG_BC_S_LE:
  343. yes = entry->sport <= op[1].no;
  344. break;
  345. case INET_DIAG_BC_D_GE:
  346. yes = entry->dport >= op[1].no;
  347. break;
  348. case INET_DIAG_BC_D_LE:
  349. yes = entry->dport <= op[1].no;
  350. break;
  351. case INET_DIAG_BC_AUTO:
  352. yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
  353. break;
  354. case INET_DIAG_BC_S_COND:
  355. case INET_DIAG_BC_D_COND: {
  356. struct inet_diag_hostcond *cond;
  357. __be32 *addr;
  358. cond = (struct inet_diag_hostcond *)(op + 1);
  359. if (cond->port != -1 &&
  360. cond->port != (op->code == INET_DIAG_BC_S_COND ?
  361. entry->sport : entry->dport)) {
  362. yes = 0;
  363. break;
  364. }
  365. if (op->code == INET_DIAG_BC_S_COND)
  366. addr = entry->saddr;
  367. else
  368. addr = entry->daddr;
  369. if (cond->family != AF_UNSPEC &&
  370. cond->family != entry->family) {
  371. if (entry->family == AF_INET6 &&
  372. cond->family == AF_INET) {
  373. if (addr[0] == 0 && addr[1] == 0 &&
  374. addr[2] == htonl(0xffff) &&
  375. bitstring_match(addr + 3,
  376. cond->addr,
  377. cond->prefix_len))
  378. break;
  379. }
  380. yes = 0;
  381. break;
  382. }
  383. if (cond->prefix_len == 0)
  384. break;
  385. if (bitstring_match(addr, cond->addr,
  386. cond->prefix_len))
  387. break;
  388. yes = 0;
  389. break;
  390. }
  391. }
  392. if (yes) {
  393. len -= op->yes;
  394. bc += op->yes;
  395. } else {
  396. len -= op->no;
  397. bc += op->no;
  398. }
  399. }
  400. return len == 0;
  401. }
  402. int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
  403. {
  404. struct inet_diag_entry entry;
  405. struct inet_sock *inet = inet_sk(sk);
  406. if (bc == NULL)
  407. return 1;
  408. entry.family = sk->sk_family;
  409. #if IS_ENABLED(CONFIG_IPV6)
  410. if (entry.family == AF_INET6) {
  411. entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
  412. entry.daddr = sk->sk_v6_daddr.s6_addr32;
  413. } else
  414. #endif
  415. {
  416. entry.saddr = &inet->inet_rcv_saddr;
  417. entry.daddr = &inet->inet_daddr;
  418. }
  419. entry.sport = inet->inet_num;
  420. entry.dport = ntohs(inet->inet_dport);
  421. entry.userlocks = sk->sk_userlocks;
  422. return inet_diag_bc_run(bc, &entry);
  423. }
  424. EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
  425. static int valid_cc(const void *bc, int len, int cc)
  426. {
  427. while (len >= 0) {
  428. const struct inet_diag_bc_op *op = bc;
  429. if (cc > len)
  430. return 0;
  431. if (cc == len)
  432. return 1;
  433. if (op->yes < 4 || op->yes & 3)
  434. return 0;
  435. len -= op->yes;
  436. bc += op->yes;
  437. }
  438. return 0;
  439. }
  440. /* Validate an inet_diag_hostcond. */
  441. static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
  442. int *min_len)
  443. {
  444. int addr_len;
  445. struct inet_diag_hostcond *cond;
  446. /* Check hostcond space. */
  447. *min_len += sizeof(struct inet_diag_hostcond);
  448. if (len < *min_len)
  449. return false;
  450. cond = (struct inet_diag_hostcond *)(op + 1);
  451. /* Check address family and address length. */
  452. switch (cond->family) {
  453. case AF_UNSPEC:
  454. addr_len = 0;
  455. break;
  456. case AF_INET:
  457. addr_len = sizeof(struct in_addr);
  458. break;
  459. case AF_INET6:
  460. addr_len = sizeof(struct in6_addr);
  461. break;
  462. default:
  463. return false;
  464. }
  465. *min_len += addr_len;
  466. if (len < *min_len)
  467. return false;
  468. /* Check prefix length (in bits) vs address length (in bytes). */
  469. if (cond->prefix_len > 8 * addr_len)
  470. return false;
  471. return true;
  472. }
  473. /* Validate a port comparison operator. */
  474. static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
  475. int len, int *min_len)
  476. {
  477. /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
  478. *min_len += sizeof(struct inet_diag_bc_op);
  479. if (len < *min_len)
  480. return false;
  481. return true;
  482. }
  483. static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
  484. {
  485. const void *bc = bytecode;
  486. int len = bytecode_len;
  487. while (len > 0) {
  488. const struct inet_diag_bc_op *op = bc;
  489. int min_len = sizeof(struct inet_diag_bc_op);
  490. //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
  491. switch (op->code) {
  492. case INET_DIAG_BC_S_COND:
  493. case INET_DIAG_BC_D_COND:
  494. if (!valid_hostcond(bc, len, &min_len))
  495. return -EINVAL;
  496. break;
  497. case INET_DIAG_BC_S_GE:
  498. case INET_DIAG_BC_S_LE:
  499. case INET_DIAG_BC_D_GE:
  500. case INET_DIAG_BC_D_LE:
  501. if (!valid_port_comparison(bc, len, &min_len))
  502. return -EINVAL;
  503. break;
  504. case INET_DIAG_BC_AUTO:
  505. case INET_DIAG_BC_JMP:
  506. case INET_DIAG_BC_NOP:
  507. break;
  508. default:
  509. return -EINVAL;
  510. }
  511. if (op->code != INET_DIAG_BC_NOP) {
  512. if (op->no < min_len || op->no > len + 4 || op->no & 3)
  513. return -EINVAL;
  514. if (op->no < len &&
  515. !valid_cc(bytecode, bytecode_len, len - op->no))
  516. return -EINVAL;
  517. }
  518. if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
  519. return -EINVAL;
  520. bc += op->yes;
  521. len -= op->yes;
  522. }
  523. return len == 0 ? 0 : -EINVAL;
  524. }
  525. static int inet_csk_diag_dump(struct sock *sk,
  526. struct sk_buff *skb,
  527. struct netlink_callback *cb,
  528. struct inet_diag_req_v2 *r,
  529. const struct nlattr *bc)
  530. {
  531. if (!inet_diag_bc_sk(bc, sk))
  532. return 0;
  533. return inet_csk_diag_fill(sk, skb, r,
  534. sk_user_ns(NETLINK_CB(cb->skb).sk),
  535. NETLINK_CB(cb->skb).portid,
  536. cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
  537. }
  538. static int inet_twsk_diag_dump(struct sock *sk,
  539. struct sk_buff *skb,
  540. struct netlink_callback *cb,
  541. struct inet_diag_req_v2 *r,
  542. const struct nlattr *bc)
  543. {
  544. struct inet_timewait_sock *tw = inet_twsk(sk);
  545. if (bc != NULL) {
  546. struct inet_diag_entry entry;
  547. entry.family = tw->tw_family;
  548. #if IS_ENABLED(CONFIG_IPV6)
  549. if (tw->tw_family == AF_INET6) {
  550. entry.saddr = tw->tw_v6_rcv_saddr.s6_addr32;
  551. entry.daddr = tw->tw_v6_daddr.s6_addr32;
  552. } else
  553. #endif
  554. {
  555. entry.saddr = &tw->tw_rcv_saddr;
  556. entry.daddr = &tw->tw_daddr;
  557. }
  558. entry.sport = tw->tw_num;
  559. entry.dport = ntohs(tw->tw_dport);
  560. entry.userlocks = 0;
  561. if (!inet_diag_bc_run(bc, &entry))
  562. return 0;
  563. }
  564. return inet_twsk_diag_fill(tw, skb, r,
  565. NETLINK_CB(cb->skb).portid,
  566. cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
  567. }
  568. /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
  569. * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
  570. */
  571. static inline void inet_diag_req_addrs(const struct sock *sk,
  572. const struct request_sock *req,
  573. struct inet_diag_entry *entry)
  574. {
  575. struct inet_request_sock *ireq = inet_rsk(req);
  576. #if IS_ENABLED(CONFIG_IPV6)
  577. if (sk->sk_family == AF_INET6) {
  578. if (req->rsk_ops->family == AF_INET6) {
  579. entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
  580. entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
  581. } else if (req->rsk_ops->family == AF_INET) {
  582. ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
  583. &entry->saddr_storage);
  584. ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
  585. &entry->daddr_storage);
  586. entry->saddr = entry->saddr_storage.s6_addr32;
  587. entry->daddr = entry->daddr_storage.s6_addr32;
  588. }
  589. } else
  590. #endif
  591. {
  592. entry->saddr = &ireq->ir_loc_addr;
  593. entry->daddr = &ireq->ir_rmt_addr;
  594. }
  595. }
  596. static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
  597. struct request_sock *req,
  598. struct user_namespace *user_ns,
  599. u32 portid, u32 seq,
  600. const struct nlmsghdr *unlh)
  601. {
  602. const struct inet_request_sock *ireq = inet_rsk(req);
  603. struct inet_sock *inet = inet_sk(sk);
  604. struct inet_diag_msg *r;
  605. struct nlmsghdr *nlh;
  606. long tmo;
  607. nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
  608. NLM_F_MULTI);
  609. if (!nlh)
  610. return -EMSGSIZE;
  611. r = nlmsg_data(nlh);
  612. r->idiag_family = sk->sk_family;
  613. r->idiag_state = TCP_SYN_RECV;
  614. r->idiag_timer = 1;
  615. r->idiag_retrans = req->num_retrans;
  616. r->id.idiag_if = sk->sk_bound_dev_if;
  617. sock_diag_save_cookie(req, r->id.idiag_cookie);
  618. tmo = req->expires - jiffies;
  619. if (tmo < 0)
  620. tmo = 0;
  621. r->id.idiag_sport = inet->inet_sport;
  622. r->id.idiag_dport = ireq->ir_rmt_port;
  623. r->id.idiag_src[0] = ireq->ir_loc_addr;
  624. r->id.idiag_dst[0] = ireq->ir_rmt_addr;
  625. r->idiag_expires = jiffies_to_msecs(tmo);
  626. r->idiag_rqueue = 0;
  627. r->idiag_wqueue = 0;
  628. r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
  629. r->idiag_inode = 0;
  630. #if IS_ENABLED(CONFIG_IPV6)
  631. if (r->idiag_family == AF_INET6) {
  632. struct inet_diag_entry entry;
  633. inet_diag_req_addrs(sk, req, &entry);
  634. memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
  635. memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
  636. }
  637. #endif
  638. return nlmsg_end(skb, nlh);
  639. }
  640. static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
  641. struct netlink_callback *cb,
  642. struct inet_diag_req_v2 *r,
  643. const struct nlattr *bc)
  644. {
  645. struct inet_diag_entry entry;
  646. struct inet_connection_sock *icsk = inet_csk(sk);
  647. struct listen_sock *lopt;
  648. struct inet_sock *inet = inet_sk(sk);
  649. int j, s_j;
  650. int reqnum, s_reqnum;
  651. int err = 0;
  652. s_j = cb->args[3];
  653. s_reqnum = cb->args[4];
  654. if (s_j > 0)
  655. s_j--;
  656. entry.family = sk->sk_family;
  657. read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
  658. lopt = icsk->icsk_accept_queue.listen_opt;
  659. if (!lopt || !lopt->qlen)
  660. goto out;
  661. if (bc != NULL) {
  662. entry.sport = inet->inet_num;
  663. entry.userlocks = sk->sk_userlocks;
  664. }
  665. for (j = s_j; j < lopt->nr_table_entries; j++) {
  666. struct request_sock *req, *head = lopt->syn_table[j];
  667. reqnum = 0;
  668. for (req = head; req; reqnum++, req = req->dl_next) {
  669. struct inet_request_sock *ireq = inet_rsk(req);
  670. if (reqnum < s_reqnum)
  671. continue;
  672. if (r->id.idiag_dport != ireq->ir_rmt_port &&
  673. r->id.idiag_dport)
  674. continue;
  675. if (bc) {
  676. inet_diag_req_addrs(sk, req, &entry);
  677. entry.dport = ntohs(ireq->ir_rmt_port);
  678. if (!inet_diag_bc_run(bc, &entry))
  679. continue;
  680. }
  681. err = inet_diag_fill_req(skb, sk, req,
  682. sk_user_ns(NETLINK_CB(cb->skb).sk),
  683. NETLINK_CB(cb->skb).portid,
  684. cb->nlh->nlmsg_seq, cb->nlh);
  685. if (err < 0) {
  686. cb->args[3] = j + 1;
  687. cb->args[4] = reqnum;
  688. goto out;
  689. }
  690. }
  691. s_reqnum = 0;
  692. }
  693. out:
  694. read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
  695. return err;
  696. }
  697. void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
  698. struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
  699. {
  700. int i, num;
  701. int s_i, s_num;
  702. struct net *net = sock_net(skb->sk);
  703. s_i = cb->args[1];
  704. s_num = num = cb->args[2];
  705. if (cb->args[0] == 0) {
  706. if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
  707. goto skip_listen_ht;
  708. for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
  709. struct sock *sk;
  710. struct hlist_nulls_node *node;
  711. struct inet_listen_hashbucket *ilb;
  712. num = 0;
  713. ilb = &hashinfo->listening_hash[i];
  714. spin_lock_bh(&ilb->lock);
  715. sk_nulls_for_each(sk, node, &ilb->head) {
  716. struct inet_sock *inet = inet_sk(sk);
  717. if (!net_eq(sock_net(sk), net))
  718. continue;
  719. if (num < s_num) {
  720. num++;
  721. continue;
  722. }
  723. if (r->sdiag_family != AF_UNSPEC &&
  724. sk->sk_family != r->sdiag_family)
  725. goto next_listen;
  726. if (r->id.idiag_sport != inet->inet_sport &&
  727. r->id.idiag_sport)
  728. goto next_listen;
  729. if (!(r->idiag_states & TCPF_LISTEN) ||
  730. r->id.idiag_dport ||
  731. cb->args[3] > 0)
  732. goto syn_recv;
  733. if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
  734. spin_unlock_bh(&ilb->lock);
  735. goto done;
  736. }
  737. syn_recv:
  738. if (!(r->idiag_states & TCPF_SYN_RECV))
  739. goto next_listen;
  740. if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
  741. spin_unlock_bh(&ilb->lock);
  742. goto done;
  743. }
  744. next_listen:
  745. cb->args[3] = 0;
  746. cb->args[4] = 0;
  747. ++num;
  748. }
  749. spin_unlock_bh(&ilb->lock);
  750. s_num = 0;
  751. cb->args[3] = 0;
  752. cb->args[4] = 0;
  753. }
  754. skip_listen_ht:
  755. cb->args[0] = 1;
  756. s_i = num = s_num = 0;
  757. }
  758. if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
  759. goto out;
  760. for (i = s_i; i <= hashinfo->ehash_mask; i++) {
  761. struct inet_ehash_bucket *head = &hashinfo->ehash[i];
  762. spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
  763. struct sock *sk;
  764. struct hlist_nulls_node *node;
  765. num = 0;
  766. if (hlist_nulls_empty(&head->chain))
  767. continue;
  768. if (i > s_i)
  769. s_num = 0;
  770. spin_lock_bh(lock);
  771. sk_nulls_for_each(sk, node, &head->chain) {
  772. int res;
  773. if (!net_eq(sock_net(sk), net))
  774. continue;
  775. if (num < s_num)
  776. goto next_normal;
  777. if (!(r->idiag_states & (1 << sk->sk_state)))
  778. goto next_normal;
  779. if (r->sdiag_family != AF_UNSPEC &&
  780. sk->sk_family != r->sdiag_family)
  781. goto next_normal;
  782. if (r->id.idiag_sport != htons(sk->sk_num) &&
  783. r->id.idiag_sport)
  784. goto next_normal;
  785. if (r->id.idiag_dport != sk->sk_dport &&
  786. r->id.idiag_dport)
  787. goto next_normal;
  788. if (sk->sk_state == TCP_TIME_WAIT)
  789. res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
  790. else
  791. res = inet_csk_diag_dump(sk, skb, cb, r, bc);
  792. if (res < 0) {
  793. spin_unlock_bh(lock);
  794. goto done;
  795. }
  796. next_normal:
  797. ++num;
  798. }
  799. spin_unlock_bh(lock);
  800. }
  801. done:
  802. cb->args[1] = i;
  803. cb->args[2] = num;
  804. out:
  805. ;
  806. }
  807. EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
  808. static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
  809. struct inet_diag_req_v2 *r, struct nlattr *bc)
  810. {
  811. const struct inet_diag_handler *handler;
  812. int err = 0;
  813. handler = inet_diag_lock_handler(r->sdiag_protocol);
  814. if (!IS_ERR(handler))
  815. handler->dump(skb, cb, r, bc);
  816. else
  817. err = PTR_ERR(handler);
  818. inet_diag_unlock_handler(handler);
  819. return err ? : skb->len;
  820. }
  821. static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
  822. {
  823. struct nlattr *bc = NULL;
  824. int hdrlen = sizeof(struct inet_diag_req_v2);
  825. if (nlmsg_attrlen(cb->nlh, hdrlen))
  826. bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
  827. return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
  828. }
  829. static inline int inet_diag_type2proto(int type)
  830. {
  831. switch (type) {
  832. case TCPDIAG_GETSOCK:
  833. return IPPROTO_TCP;
  834. case DCCPDIAG_GETSOCK:
  835. return IPPROTO_DCCP;
  836. default:
  837. return 0;
  838. }
  839. }
  840. static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
  841. {
  842. struct inet_diag_req *rc = nlmsg_data(cb->nlh);
  843. struct inet_diag_req_v2 req;
  844. struct nlattr *bc = NULL;
  845. int hdrlen = sizeof(struct inet_diag_req);
  846. req.sdiag_family = AF_UNSPEC; /* compatibility */
  847. req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
  848. req.idiag_ext = rc->idiag_ext;
  849. req.idiag_states = rc->idiag_states;
  850. req.id = rc->id;
  851. if (nlmsg_attrlen(cb->nlh, hdrlen))
  852. bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
  853. return __inet_diag_dump(skb, cb, &req, bc);
  854. }
  855. static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
  856. const struct nlmsghdr *nlh)
  857. {
  858. struct inet_diag_req *rc = nlmsg_data(nlh);
  859. struct inet_diag_req_v2 req;
  860. req.sdiag_family = rc->idiag_family;
  861. req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
  862. req.idiag_ext = rc->idiag_ext;
  863. req.idiag_states = rc->idiag_states;
  864. req.id = rc->id;
  865. return inet_diag_get_exact(in_skb, nlh, &req);
  866. }
  867. static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
  868. {
  869. int hdrlen = sizeof(struct inet_diag_req);
  870. struct net *net = sock_net(skb->sk);
  871. if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
  872. nlmsg_len(nlh) < hdrlen)
  873. return -EINVAL;
  874. if (nlh->nlmsg_flags & NLM_F_DUMP) {
  875. if (nlmsg_attrlen(nlh, hdrlen)) {
  876. struct nlattr *attr;
  877. attr = nlmsg_find_attr(nlh, hdrlen,
  878. INET_DIAG_REQ_BYTECODE);
  879. if (attr == NULL ||
  880. nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
  881. inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
  882. return -EINVAL;
  883. }
  884. {
  885. struct netlink_dump_control c = {
  886. .dump = inet_diag_dump_compat,
  887. };
  888. return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
  889. }
  890. }
  891. return inet_diag_get_exact_compat(skb, nlh);
  892. }
  893. static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
  894. {
  895. int hdrlen = sizeof(struct inet_diag_req_v2);
  896. struct net *net = sock_net(skb->sk);
  897. if (nlmsg_len(h) < hdrlen)
  898. return -EINVAL;
  899. if (h->nlmsg_flags & NLM_F_DUMP) {
  900. if (nlmsg_attrlen(h, hdrlen)) {
  901. struct nlattr *attr;
  902. attr = nlmsg_find_attr(h, hdrlen,
  903. INET_DIAG_REQ_BYTECODE);
  904. if (attr == NULL ||
  905. nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
  906. inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
  907. return -EINVAL;
  908. }
  909. {
  910. struct netlink_dump_control c = {
  911. .dump = inet_diag_dump,
  912. };
  913. return netlink_dump_start(net->diag_nlsk, skb, h, &c);
  914. }
  915. }
  916. return inet_diag_get_exact(skb, h, nlmsg_data(h));
  917. }
  918. static const struct sock_diag_handler inet_diag_handler = {
  919. .family = AF_INET,
  920. .dump = inet_diag_handler_dump,
  921. };
  922. static const struct sock_diag_handler inet6_diag_handler = {
  923. .family = AF_INET6,
  924. .dump = inet_diag_handler_dump,
  925. };
  926. int inet_diag_register(const struct inet_diag_handler *h)
  927. {
  928. const __u16 type = h->idiag_type;
  929. int err = -EINVAL;
  930. if (type >= IPPROTO_MAX)
  931. goto out;
  932. mutex_lock(&inet_diag_table_mutex);
  933. err = -EEXIST;
  934. if (inet_diag_table[type] == NULL) {
  935. inet_diag_table[type] = h;
  936. err = 0;
  937. }
  938. mutex_unlock(&inet_diag_table_mutex);
  939. out:
  940. return err;
  941. }
  942. EXPORT_SYMBOL_GPL(inet_diag_register);
  943. void inet_diag_unregister(const struct inet_diag_handler *h)
  944. {
  945. const __u16 type = h->idiag_type;
  946. if (type >= IPPROTO_MAX)
  947. return;
  948. mutex_lock(&inet_diag_table_mutex);
  949. inet_diag_table[type] = NULL;
  950. mutex_unlock(&inet_diag_table_mutex);
  951. }
  952. EXPORT_SYMBOL_GPL(inet_diag_unregister);
  953. static int __init inet_diag_init(void)
  954. {
  955. const int inet_diag_table_size = (IPPROTO_MAX *
  956. sizeof(struct inet_diag_handler *));
  957. int err = -ENOMEM;
  958. inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
  959. if (!inet_diag_table)
  960. goto out;
  961. err = sock_diag_register(&inet_diag_handler);
  962. if (err)
  963. goto out_free_nl;
  964. err = sock_diag_register(&inet6_diag_handler);
  965. if (err)
  966. goto out_free_inet;
  967. sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
  968. out:
  969. return err;
  970. out_free_inet:
  971. sock_diag_unregister(&inet_diag_handler);
  972. out_free_nl:
  973. kfree(inet_diag_table);
  974. goto out;
  975. }
  976. static void __exit inet_diag_exit(void)
  977. {
  978. sock_diag_unregister(&inet6_diag_handler);
  979. sock_diag_unregister(&inet_diag_handler);
  980. sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
  981. kfree(inet_diag_table);
  982. }
  983. module_init(inet_diag_init);
  984. module_exit(inet_diag_exit);
  985. MODULE_LICENSE("GPL");
  986. MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
  987. MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);