af_x25.c 40 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * X.25 Packet Layer release 002
  4. *
  5. * This is ALPHA test software. This code may break your machine,
  6. * randomly fail to work with new releases, misbehave and/or generally
  7. * screw up. It might even work.
  8. *
  9. * This code REQUIRES 2.1.15 or higher
  10. *
  11. * History
  12. * X.25 001 Jonathan Naylor Started coding.
  13. * X.25 002 Jonathan Naylor Centralised disconnect handling.
  14. * New timer architecture.
  15. * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
  16. * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
  17. * facilities negotiation and increased
  18. * the throughput upper limit.
  19. * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
  20. * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
  21. * Fixed x25_output() related skb leakage.
  22. * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
  23. * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
  24. * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
  25. * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  26. * x25_proc.c, using seq_file
  27. * 2005-04-02 Shaun Pereira Selective sub address matching
  28. * with call user data
  29. * 2005-04-15 Shaun Pereira Fast select with no restriction on
  30. * response
  31. */
  32. #define pr_fmt(fmt) "X25: " fmt
  33. #include <linux/module.h>
  34. #include <linux/capability.h>
  35. #include <linux/errno.h>
  36. #include <linux/kernel.h>
  37. #include <linux/sched/signal.h>
  38. #include <linux/timer.h>
  39. #include <linux/string.h>
  40. #include <linux/net.h>
  41. #include <linux/netdevice.h>
  42. #include <linux/if_arp.h>
  43. #include <linux/skbuff.h>
  44. #include <linux/slab.h>
  45. #include <net/sock.h>
  46. #include <net/tcp_states.h>
  47. #include <linux/uaccess.h>
  48. #include <linux/fcntl.h>
  49. #include <linux/termios.h> /* For TIOCINQ/OUTQ */
  50. #include <linux/notifier.h>
  51. #include <linux/init.h>
  52. #include <linux/compat.h>
  53. #include <linux/ctype.h>
  54. #include <net/x25.h>
  55. #include <net/compat.h>
  56. int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  57. int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
  58. int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
  59. int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
  60. int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
  61. int sysctl_x25_forward = 0;
  62. HLIST_HEAD(x25_list);
  63. DEFINE_RWLOCK(x25_list_lock);
  64. static const struct proto_ops x25_proto_ops;
  65. static const struct x25_address null_x25_address = {" "};
  66. #ifdef CONFIG_COMPAT
  67. struct compat_x25_subscrip_struct {
  68. char device[200-sizeof(compat_ulong_t)];
  69. compat_ulong_t global_facil_mask;
  70. compat_uint_t extended;
  71. };
  72. #endif
  73. int x25_parse_address_block(struct sk_buff *skb,
  74. struct x25_address *called_addr,
  75. struct x25_address *calling_addr)
  76. {
  77. unsigned char len;
  78. int needed;
  79. int rc;
  80. if (!pskb_may_pull(skb, 1)) {
  81. /* packet has no address block */
  82. rc = 0;
  83. goto empty;
  84. }
  85. len = *skb->data;
  86. needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
  87. if (!pskb_may_pull(skb, needed)) {
  88. /* packet is too short to hold the addresses it claims
  89. to hold */
  90. rc = -1;
  91. goto empty;
  92. }
  93. return x25_addr_ntoa(skb->data, called_addr, calling_addr);
  94. empty:
  95. *called_addr->x25_addr = 0;
  96. *calling_addr->x25_addr = 0;
  97. return rc;
  98. }
  99. int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  100. struct x25_address *calling_addr)
  101. {
  102. unsigned int called_len, calling_len;
  103. char *called, *calling;
  104. unsigned int i;
  105. called_len = (*p >> 0) & 0x0F;
  106. calling_len = (*p >> 4) & 0x0F;
  107. called = called_addr->x25_addr;
  108. calling = calling_addr->x25_addr;
  109. p++;
  110. for (i = 0; i < (called_len + calling_len); i++) {
  111. if (i < called_len) {
  112. if (i % 2 != 0) {
  113. *called++ = ((*p >> 0) & 0x0F) + '0';
  114. p++;
  115. } else {
  116. *called++ = ((*p >> 4) & 0x0F) + '0';
  117. }
  118. } else {
  119. if (i % 2 != 0) {
  120. *calling++ = ((*p >> 0) & 0x0F) + '0';
  121. p++;
  122. } else {
  123. *calling++ = ((*p >> 4) & 0x0F) + '0';
  124. }
  125. }
  126. }
  127. *called = *calling = '\0';
  128. return 1 + (called_len + calling_len + 1) / 2;
  129. }
  130. int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
  131. struct x25_address *calling_addr)
  132. {
  133. unsigned int called_len, calling_len;
  134. char *called, *calling;
  135. int i;
  136. called = called_addr->x25_addr;
  137. calling = calling_addr->x25_addr;
  138. called_len = strlen(called);
  139. calling_len = strlen(calling);
  140. *p++ = (calling_len << 4) | (called_len << 0);
  141. for (i = 0; i < (called_len + calling_len); i++) {
  142. if (i < called_len) {
  143. if (i % 2 != 0) {
  144. *p |= (*called++ - '0') << 0;
  145. p++;
  146. } else {
  147. *p = 0x00;
  148. *p |= (*called++ - '0') << 4;
  149. }
  150. } else {
  151. if (i % 2 != 0) {
  152. *p |= (*calling++ - '0') << 0;
  153. p++;
  154. } else {
  155. *p = 0x00;
  156. *p |= (*calling++ - '0') << 4;
  157. }
  158. }
  159. }
  160. return 1 + (called_len + calling_len + 1) / 2;
  161. }
  162. /*
  163. * Socket removal during an interrupt is now safe.
  164. */
  165. static void x25_remove_socket(struct sock *sk)
  166. {
  167. write_lock_bh(&x25_list_lock);
  168. sk_del_node_init(sk);
  169. write_unlock_bh(&x25_list_lock);
  170. }
  171. /*
  172. * Kill all bound sockets on a dropped device.
  173. */
  174. static void x25_kill_by_device(struct net_device *dev)
  175. {
  176. struct sock *s;
  177. write_lock_bh(&x25_list_lock);
  178. sk_for_each(s, &x25_list)
  179. if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
  180. x25_disconnect(s, ENETUNREACH, 0, 0);
  181. write_unlock_bh(&x25_list_lock);
  182. }
  183. /*
  184. * Handle device status changes.
  185. */
  186. static int x25_device_event(struct notifier_block *this, unsigned long event,
  187. void *ptr)
  188. {
  189. struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  190. struct x25_neigh *nb;
  191. if (!net_eq(dev_net(dev), &init_net))
  192. return NOTIFY_DONE;
  193. if (dev->type == ARPHRD_X25
  194. #if IS_ENABLED(CONFIG_LLC)
  195. || dev->type == ARPHRD_ETHER
  196. #endif
  197. ) {
  198. switch (event) {
  199. case NETDEV_UP:
  200. x25_link_device_up(dev);
  201. break;
  202. case NETDEV_GOING_DOWN:
  203. nb = x25_get_neigh(dev);
  204. if (nb) {
  205. x25_terminate_link(nb);
  206. x25_neigh_put(nb);
  207. }
  208. break;
  209. case NETDEV_DOWN:
  210. x25_kill_by_device(dev);
  211. x25_route_device_down(dev);
  212. x25_link_device_down(dev);
  213. break;
  214. }
  215. }
  216. return NOTIFY_DONE;
  217. }
  218. /*
  219. * Add a socket to the bound sockets list.
  220. */
  221. static void x25_insert_socket(struct sock *sk)
  222. {
  223. write_lock_bh(&x25_list_lock);
  224. sk_add_node(sk, &x25_list);
  225. write_unlock_bh(&x25_list_lock);
  226. }
  227. /*
  228. * Find a socket that wants to accept the Call Request we just
  229. * received. Check the full list for an address/cud match.
  230. * If no cuds match return the next_best thing, an address match.
  231. * Note: if a listening socket has cud set it must only get calls
  232. * with matching cud.
  233. */
  234. static struct sock *x25_find_listener(struct x25_address *addr,
  235. struct sk_buff *skb)
  236. {
  237. struct sock *s;
  238. struct sock *next_best;
  239. read_lock_bh(&x25_list_lock);
  240. next_best = NULL;
  241. sk_for_each(s, &x25_list)
  242. if ((!strcmp(addr->x25_addr,
  243. x25_sk(s)->source_addr.x25_addr) ||
  244. !strcmp(x25_sk(s)->source_addr.x25_addr,
  245. null_x25_address.x25_addr)) &&
  246. s->sk_state == TCP_LISTEN) {
  247. /*
  248. * Found a listening socket, now check the incoming
  249. * call user data vs this sockets call user data
  250. */
  251. if (x25_sk(s)->cudmatchlength > 0 &&
  252. skb->len >= x25_sk(s)->cudmatchlength) {
  253. if((memcmp(x25_sk(s)->calluserdata.cuddata,
  254. skb->data,
  255. x25_sk(s)->cudmatchlength)) == 0) {
  256. sock_hold(s);
  257. goto found;
  258. }
  259. } else
  260. next_best = s;
  261. }
  262. if (next_best) {
  263. s = next_best;
  264. sock_hold(s);
  265. goto found;
  266. }
  267. s = NULL;
  268. found:
  269. read_unlock_bh(&x25_list_lock);
  270. return s;
  271. }
  272. /*
  273. * Find a connected X.25 socket given my LCI and neighbour.
  274. */
  275. static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
  276. {
  277. struct sock *s;
  278. sk_for_each(s, &x25_list)
  279. if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
  280. sock_hold(s);
  281. goto found;
  282. }
  283. s = NULL;
  284. found:
  285. return s;
  286. }
  287. struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
  288. {
  289. struct sock *s;
  290. read_lock_bh(&x25_list_lock);
  291. s = __x25_find_socket(lci, nb);
  292. read_unlock_bh(&x25_list_lock);
  293. return s;
  294. }
  295. /*
  296. * Find a unique LCI for a given device.
  297. */
  298. static unsigned int x25_new_lci(struct x25_neigh *nb)
  299. {
  300. unsigned int lci = 1;
  301. struct sock *sk;
  302. while ((sk = x25_find_socket(lci, nb)) != NULL) {
  303. sock_put(sk);
  304. if (++lci == 4096) {
  305. lci = 0;
  306. break;
  307. }
  308. cond_resched();
  309. }
  310. return lci;
  311. }
  312. /*
  313. * Deferred destroy.
  314. */
  315. static void __x25_destroy_socket(struct sock *);
  316. /*
  317. * handler for deferred kills.
  318. */
  319. static void x25_destroy_timer(struct timer_list *t)
  320. {
  321. struct sock *sk = from_timer(sk, t, sk_timer);
  322. x25_destroy_socket_from_timer(sk);
  323. }
  324. /*
  325. * This is called from user mode and the timers. Thus it protects itself
  326. * against interrupt users but doesn't worry about being called during
  327. * work. Once it is removed from the queue no interrupt or bottom half
  328. * will touch it and we are (fairly 8-) ) safe.
  329. * Not static as it's used by the timer
  330. */
  331. static void __x25_destroy_socket(struct sock *sk)
  332. {
  333. struct sk_buff *skb;
  334. x25_stop_heartbeat(sk);
  335. x25_stop_timer(sk);
  336. x25_remove_socket(sk);
  337. x25_clear_queues(sk); /* Flush the queues */
  338. while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
  339. if (skb->sk != sk) { /* A pending connection */
  340. /*
  341. * Queue the unaccepted socket for death
  342. */
  343. skb->sk->sk_state = TCP_LISTEN;
  344. sock_set_flag(skb->sk, SOCK_DEAD);
  345. x25_start_heartbeat(skb->sk);
  346. x25_sk(skb->sk)->state = X25_STATE_0;
  347. }
  348. kfree_skb(skb);
  349. }
  350. if (sk_has_allocations(sk)) {
  351. /* Defer: outstanding buffers */
  352. sk->sk_timer.expires = jiffies + 10 * HZ;
  353. sk->sk_timer.function = x25_destroy_timer;
  354. add_timer(&sk->sk_timer);
  355. } else {
  356. /* drop last reference so sock_put will free */
  357. __sock_put(sk);
  358. }
  359. }
  360. void x25_destroy_socket_from_timer(struct sock *sk)
  361. {
  362. sock_hold(sk);
  363. bh_lock_sock(sk);
  364. __x25_destroy_socket(sk);
  365. bh_unlock_sock(sk);
  366. sock_put(sk);
  367. }
  368. /*
  369. * Handling for system calls applied via the various interfaces to a
  370. * X.25 socket object.
  371. */
  372. static int x25_setsockopt(struct socket *sock, int level, int optname,
  373. sockptr_t optval, unsigned int optlen)
  374. {
  375. int opt;
  376. struct sock *sk = sock->sk;
  377. int rc = -ENOPROTOOPT;
  378. if (level != SOL_X25 || optname != X25_QBITINCL)
  379. goto out;
  380. rc = -EINVAL;
  381. if (optlen < sizeof(int))
  382. goto out;
  383. rc = -EFAULT;
  384. if (copy_from_sockptr(&opt, optval, sizeof(int)))
  385. goto out;
  386. if (opt)
  387. set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
  388. else
  389. clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
  390. rc = 0;
  391. out:
  392. return rc;
  393. }
  394. static int x25_getsockopt(struct socket *sock, int level, int optname,
  395. char __user *optval, int __user *optlen)
  396. {
  397. struct sock *sk = sock->sk;
  398. int val, len, rc = -ENOPROTOOPT;
  399. if (level != SOL_X25 || optname != X25_QBITINCL)
  400. goto out;
  401. rc = -EFAULT;
  402. if (get_user(len, optlen))
  403. goto out;
  404. len = min_t(unsigned int, len, sizeof(int));
  405. rc = -EINVAL;
  406. if (len < 0)
  407. goto out;
  408. rc = -EFAULT;
  409. if (put_user(len, optlen))
  410. goto out;
  411. val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
  412. rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
  413. out:
  414. return rc;
  415. }
  416. static int x25_listen(struct socket *sock, int backlog)
  417. {
  418. struct sock *sk = sock->sk;
  419. int rc = -EOPNOTSUPP;
  420. lock_sock(sk);
  421. if (sk->sk_state != TCP_LISTEN) {
  422. memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
  423. sk->sk_max_ack_backlog = backlog;
  424. sk->sk_state = TCP_LISTEN;
  425. rc = 0;
  426. }
  427. release_sock(sk);
  428. return rc;
  429. }
  430. static struct proto x25_proto = {
  431. .name = "X25",
  432. .owner = THIS_MODULE,
  433. .obj_size = sizeof(struct x25_sock),
  434. };
  435. static struct sock *x25_alloc_socket(struct net *net, int kern)
  436. {
  437. struct x25_sock *x25;
  438. struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
  439. if (!sk)
  440. goto out;
  441. sock_init_data(NULL, sk);
  442. x25 = x25_sk(sk);
  443. skb_queue_head_init(&x25->ack_queue);
  444. skb_queue_head_init(&x25->fragment_queue);
  445. skb_queue_head_init(&x25->interrupt_in_queue);
  446. skb_queue_head_init(&x25->interrupt_out_queue);
  447. out:
  448. return sk;
  449. }
  450. static int x25_create(struct net *net, struct socket *sock, int protocol,
  451. int kern)
  452. {
  453. struct sock *sk;
  454. struct x25_sock *x25;
  455. int rc = -EAFNOSUPPORT;
  456. if (!net_eq(net, &init_net))
  457. goto out;
  458. rc = -ESOCKTNOSUPPORT;
  459. if (sock->type != SOCK_SEQPACKET)
  460. goto out;
  461. rc = -EINVAL;
  462. if (protocol)
  463. goto out;
  464. rc = -ENOMEM;
  465. if ((sk = x25_alloc_socket(net, kern)) == NULL)
  466. goto out;
  467. x25 = x25_sk(sk);
  468. sock_init_data(sock, sk);
  469. x25_init_timers(sk);
  470. sock->ops = &x25_proto_ops;
  471. sk->sk_protocol = protocol;
  472. sk->sk_backlog_rcv = x25_backlog_rcv;
  473. x25->t21 = sysctl_x25_call_request_timeout;
  474. x25->t22 = sysctl_x25_reset_request_timeout;
  475. x25->t23 = sysctl_x25_clear_request_timeout;
  476. x25->t2 = sysctl_x25_ack_holdback_timeout;
  477. x25->state = X25_STATE_0;
  478. x25->cudmatchlength = 0;
  479. set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
  480. /* on call accept */
  481. x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
  482. x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
  483. x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
  484. x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
  485. x25->facilities.throughput = 0; /* by default don't negotiate
  486. throughput */
  487. x25->facilities.reverse = X25_DEFAULT_REVERSE;
  488. x25->dte_facilities.calling_len = 0;
  489. x25->dte_facilities.called_len = 0;
  490. memset(x25->dte_facilities.called_ae, '\0',
  491. sizeof(x25->dte_facilities.called_ae));
  492. memset(x25->dte_facilities.calling_ae, '\0',
  493. sizeof(x25->dte_facilities.calling_ae));
  494. rc = 0;
  495. out:
  496. return rc;
  497. }
  498. static struct sock *x25_make_new(struct sock *osk)
  499. {
  500. struct sock *sk = NULL;
  501. struct x25_sock *x25, *ox25;
  502. if (osk->sk_type != SOCK_SEQPACKET)
  503. goto out;
  504. if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
  505. goto out;
  506. x25 = x25_sk(sk);
  507. sk->sk_type = osk->sk_type;
  508. sk->sk_priority = osk->sk_priority;
  509. sk->sk_protocol = osk->sk_protocol;
  510. sk->sk_rcvbuf = osk->sk_rcvbuf;
  511. sk->sk_sndbuf = osk->sk_sndbuf;
  512. sk->sk_state = TCP_ESTABLISHED;
  513. sk->sk_backlog_rcv = osk->sk_backlog_rcv;
  514. sock_copy_flags(sk, osk);
  515. ox25 = x25_sk(osk);
  516. x25->t21 = ox25->t21;
  517. x25->t22 = ox25->t22;
  518. x25->t23 = ox25->t23;
  519. x25->t2 = ox25->t2;
  520. x25->flags = ox25->flags;
  521. x25->facilities = ox25->facilities;
  522. x25->dte_facilities = ox25->dte_facilities;
  523. x25->cudmatchlength = ox25->cudmatchlength;
  524. clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
  525. x25_init_timers(sk);
  526. out:
  527. return sk;
  528. }
  529. static int x25_release(struct socket *sock)
  530. {
  531. struct sock *sk = sock->sk;
  532. struct x25_sock *x25;
  533. if (!sk)
  534. return 0;
  535. x25 = x25_sk(sk);
  536. sock_hold(sk);
  537. lock_sock(sk);
  538. switch (x25->state) {
  539. case X25_STATE_0:
  540. case X25_STATE_2:
  541. x25_disconnect(sk, 0, 0, 0);
  542. __x25_destroy_socket(sk);
  543. goto out;
  544. case X25_STATE_1:
  545. case X25_STATE_3:
  546. case X25_STATE_4:
  547. x25_clear_queues(sk);
  548. x25_write_internal(sk, X25_CLEAR_REQUEST);
  549. x25_start_t23timer(sk);
  550. x25->state = X25_STATE_2;
  551. sk->sk_state = TCP_CLOSE;
  552. sk->sk_shutdown |= SEND_SHUTDOWN;
  553. sk->sk_state_change(sk);
  554. sock_set_flag(sk, SOCK_DEAD);
  555. sock_set_flag(sk, SOCK_DESTROY);
  556. break;
  557. case X25_STATE_5:
  558. x25_write_internal(sk, X25_CLEAR_REQUEST);
  559. x25_disconnect(sk, 0, 0, 0);
  560. __x25_destroy_socket(sk);
  561. goto out;
  562. }
  563. sock_orphan(sk);
  564. out:
  565. release_sock(sk);
  566. sock_put(sk);
  567. return 0;
  568. }
  569. static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
  570. {
  571. struct sock *sk = sock->sk;
  572. struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
  573. int len, i, rc = 0;
  574. if (addr_len != sizeof(struct sockaddr_x25) ||
  575. addr->sx25_family != AF_X25 ||
  576. strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
  577. rc = -EINVAL;
  578. goto out;
  579. }
  580. /* check for the null_x25_address */
  581. if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
  582. len = strlen(addr->sx25_addr.x25_addr);
  583. for (i = 0; i < len; i++) {
  584. if (!isdigit(addr->sx25_addr.x25_addr[i])) {
  585. rc = -EINVAL;
  586. goto out;
  587. }
  588. }
  589. }
  590. lock_sock(sk);
  591. if (sock_flag(sk, SOCK_ZAPPED)) {
  592. x25_sk(sk)->source_addr = addr->sx25_addr;
  593. x25_insert_socket(sk);
  594. sock_reset_flag(sk, SOCK_ZAPPED);
  595. } else {
  596. rc = -EINVAL;
  597. }
  598. release_sock(sk);
  599. SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
  600. out:
  601. return rc;
  602. }
  603. static int x25_wait_for_connection_establishment(struct sock *sk)
  604. {
  605. DECLARE_WAITQUEUE(wait, current);
  606. int rc;
  607. add_wait_queue_exclusive(sk_sleep(sk), &wait);
  608. for (;;) {
  609. __set_current_state(TASK_INTERRUPTIBLE);
  610. rc = -ERESTARTSYS;
  611. if (signal_pending(current))
  612. break;
  613. rc = sock_error(sk);
  614. if (rc) {
  615. sk->sk_socket->state = SS_UNCONNECTED;
  616. break;
  617. }
  618. rc = 0;
  619. if (sk->sk_state != TCP_ESTABLISHED) {
  620. release_sock(sk);
  621. schedule();
  622. lock_sock(sk);
  623. } else
  624. break;
  625. }
  626. __set_current_state(TASK_RUNNING);
  627. remove_wait_queue(sk_sleep(sk), &wait);
  628. return rc;
  629. }
  630. static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
  631. int addr_len, int flags)
  632. {
  633. struct sock *sk = sock->sk;
  634. struct x25_sock *x25 = x25_sk(sk);
  635. struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
  636. struct x25_route *rt;
  637. int rc = 0;
  638. lock_sock(sk);
  639. if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
  640. sock->state = SS_CONNECTED;
  641. goto out; /* Connect completed during a ERESTARTSYS event */
  642. }
  643. rc = -ECONNREFUSED;
  644. if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
  645. sock->state = SS_UNCONNECTED;
  646. goto out;
  647. }
  648. rc = -EISCONN; /* No reconnect on a seqpacket socket */
  649. if (sk->sk_state == TCP_ESTABLISHED)
  650. goto out;
  651. rc = -EALREADY; /* Do nothing if call is already in progress */
  652. if (sk->sk_state == TCP_SYN_SENT)
  653. goto out;
  654. sk->sk_state = TCP_CLOSE;
  655. sock->state = SS_UNCONNECTED;
  656. rc = -EINVAL;
  657. if (addr_len != sizeof(struct sockaddr_x25) ||
  658. addr->sx25_family != AF_X25 ||
  659. strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
  660. goto out;
  661. rc = -ENETUNREACH;
  662. rt = x25_get_route(&addr->sx25_addr);
  663. if (!rt)
  664. goto out;
  665. x25->neighbour = x25_get_neigh(rt->dev);
  666. if (!x25->neighbour)
  667. goto out_put_route;
  668. x25_limit_facilities(&x25->facilities, x25->neighbour);
  669. x25->lci = x25_new_lci(x25->neighbour);
  670. if (!x25->lci)
  671. goto out_put_neigh;
  672. rc = -EINVAL;
  673. if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
  674. goto out_put_neigh;
  675. if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
  676. memset(&x25->source_addr, '\0', X25_ADDR_LEN);
  677. x25->dest_addr = addr->sx25_addr;
  678. /* Move to connecting socket, start sending Connect Requests */
  679. sock->state = SS_CONNECTING;
  680. sk->sk_state = TCP_SYN_SENT;
  681. x25->state = X25_STATE_1;
  682. x25_write_internal(sk, X25_CALL_REQUEST);
  683. x25_start_heartbeat(sk);
  684. x25_start_t21timer(sk);
  685. /* Now the loop */
  686. rc = -EINPROGRESS;
  687. if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
  688. goto out;
  689. rc = x25_wait_for_connection_establishment(sk);
  690. if (rc)
  691. goto out_put_neigh;
  692. sock->state = SS_CONNECTED;
  693. rc = 0;
  694. out_put_neigh:
  695. if (rc && x25->neighbour) {
  696. read_lock_bh(&x25_list_lock);
  697. x25_neigh_put(x25->neighbour);
  698. x25->neighbour = NULL;
  699. read_unlock_bh(&x25_list_lock);
  700. x25->state = X25_STATE_0;
  701. }
  702. out_put_route:
  703. x25_route_put(rt);
  704. out:
  705. release_sock(sk);
  706. return rc;
  707. }
  708. static int x25_wait_for_data(struct sock *sk, long timeout)
  709. {
  710. DECLARE_WAITQUEUE(wait, current);
  711. int rc = 0;
  712. add_wait_queue_exclusive(sk_sleep(sk), &wait);
  713. for (;;) {
  714. __set_current_state(TASK_INTERRUPTIBLE);
  715. if (sk->sk_shutdown & RCV_SHUTDOWN)
  716. break;
  717. rc = -ERESTARTSYS;
  718. if (signal_pending(current))
  719. break;
  720. rc = -EAGAIN;
  721. if (!timeout)
  722. break;
  723. rc = 0;
  724. if (skb_queue_empty(&sk->sk_receive_queue)) {
  725. release_sock(sk);
  726. timeout = schedule_timeout(timeout);
  727. lock_sock(sk);
  728. } else
  729. break;
  730. }
  731. __set_current_state(TASK_RUNNING);
  732. remove_wait_queue(sk_sleep(sk), &wait);
  733. return rc;
  734. }
  735. static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
  736. bool kern)
  737. {
  738. struct sock *sk = sock->sk;
  739. struct sock *newsk;
  740. struct sk_buff *skb;
  741. int rc = -EINVAL;
  742. if (!sk)
  743. goto out;
  744. rc = -EOPNOTSUPP;
  745. if (sk->sk_type != SOCK_SEQPACKET)
  746. goto out;
  747. lock_sock(sk);
  748. rc = -EINVAL;
  749. if (sk->sk_state != TCP_LISTEN)
  750. goto out2;
  751. rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
  752. if (rc)
  753. goto out2;
  754. skb = skb_dequeue(&sk->sk_receive_queue);
  755. rc = -EINVAL;
  756. if (!skb->sk)
  757. goto out2;
  758. newsk = skb->sk;
  759. sock_graft(newsk, newsock);
  760. /* Now attach up the new socket */
  761. skb->sk = NULL;
  762. kfree_skb(skb);
  763. sk_acceptq_removed(sk);
  764. newsock->state = SS_CONNECTED;
  765. rc = 0;
  766. out2:
  767. release_sock(sk);
  768. out:
  769. return rc;
  770. }
  771. static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
  772. int peer)
  773. {
  774. struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
  775. struct sock *sk = sock->sk;
  776. struct x25_sock *x25 = x25_sk(sk);
  777. int rc = 0;
  778. if (peer) {
  779. if (sk->sk_state != TCP_ESTABLISHED) {
  780. rc = -ENOTCONN;
  781. goto out;
  782. }
  783. sx25->sx25_addr = x25->dest_addr;
  784. } else
  785. sx25->sx25_addr = x25->source_addr;
  786. sx25->sx25_family = AF_X25;
  787. rc = sizeof(*sx25);
  788. out:
  789. return rc;
  790. }
  791. int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
  792. unsigned int lci)
  793. {
  794. struct sock *sk;
  795. struct sock *make;
  796. struct x25_sock *makex25;
  797. struct x25_address source_addr, dest_addr;
  798. struct x25_facilities facilities;
  799. struct x25_dte_facilities dte_facilities;
  800. int len, addr_len, rc;
  801. /*
  802. * Remove the LCI and frame type.
  803. */
  804. skb_pull(skb, X25_STD_MIN_LEN);
  805. /*
  806. * Extract the X.25 addresses and convert them to ASCII strings,
  807. * and remove them.
  808. *
  809. * Address block is mandatory in call request packets
  810. */
  811. addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
  812. if (addr_len <= 0)
  813. goto out_clear_request;
  814. skb_pull(skb, addr_len);
  815. /*
  816. * Get the length of the facilities, skip past them for the moment
  817. * get the call user data because this is needed to determine
  818. * the correct listener
  819. *
  820. * Facilities length is mandatory in call request packets
  821. */
  822. if (!pskb_may_pull(skb, 1))
  823. goto out_clear_request;
  824. len = skb->data[0] + 1;
  825. if (!pskb_may_pull(skb, len))
  826. goto out_clear_request;
  827. skb_pull(skb,len);
  828. /*
  829. * Ensure that the amount of call user data is valid.
  830. */
  831. if (skb->len > X25_MAX_CUD_LEN)
  832. goto out_clear_request;
  833. /*
  834. * Get all the call user data so it can be used in
  835. * x25_find_listener and skb_copy_from_linear_data up ahead.
  836. */
  837. if (!pskb_may_pull(skb, skb->len))
  838. goto out_clear_request;
  839. /*
  840. * Find a listener for the particular address/cud pair.
  841. */
  842. sk = x25_find_listener(&source_addr,skb);
  843. skb_push(skb,len);
  844. if (sk != NULL && sk_acceptq_is_full(sk)) {
  845. goto out_sock_put;
  846. }
  847. /*
  848. * We dont have any listeners for this incoming call.
  849. * Try forwarding it.
  850. */
  851. if (sk == NULL) {
  852. skb_push(skb, addr_len + X25_STD_MIN_LEN);
  853. if (sysctl_x25_forward &&
  854. x25_forward_call(&dest_addr, nb, skb, lci) > 0)
  855. {
  856. /* Call was forwarded, dont process it any more */
  857. kfree_skb(skb);
  858. rc = 1;
  859. goto out;
  860. } else {
  861. /* No listeners, can't forward, clear the call */
  862. goto out_clear_request;
  863. }
  864. }
  865. /*
  866. * Try to reach a compromise on the requested facilities.
  867. */
  868. len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
  869. if (len == -1)
  870. goto out_sock_put;
  871. /*
  872. * current neighbour/link might impose additional limits
  873. * on certain facilties
  874. */
  875. x25_limit_facilities(&facilities, nb);
  876. /*
  877. * Try to create a new socket.
  878. */
  879. make = x25_make_new(sk);
  880. if (!make)
  881. goto out_sock_put;
  882. /*
  883. * Remove the facilities
  884. */
  885. skb_pull(skb, len);
  886. skb->sk = make;
  887. make->sk_state = TCP_ESTABLISHED;
  888. makex25 = x25_sk(make);
  889. makex25->lci = lci;
  890. makex25->dest_addr = dest_addr;
  891. makex25->source_addr = source_addr;
  892. x25_neigh_hold(nb);
  893. makex25->neighbour = nb;
  894. makex25->facilities = facilities;
  895. makex25->dte_facilities= dte_facilities;
  896. makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
  897. /* ensure no reverse facil on accept */
  898. makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
  899. /* ensure no calling address extension on accept */
  900. makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
  901. makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
  902. /* Normally all calls are accepted immediately */
  903. if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
  904. x25_write_internal(make, X25_CALL_ACCEPTED);
  905. makex25->state = X25_STATE_3;
  906. } else {
  907. makex25->state = X25_STATE_5;
  908. }
  909. /*
  910. * Incoming Call User Data.
  911. */
  912. skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
  913. makex25->calluserdata.cudlength = skb->len;
  914. sk_acceptq_added(sk);
  915. x25_insert_socket(make);
  916. skb_queue_head(&sk->sk_receive_queue, skb);
  917. x25_start_heartbeat(make);
  918. if (!sock_flag(sk, SOCK_DEAD))
  919. sk->sk_data_ready(sk);
  920. rc = 1;
  921. sock_put(sk);
  922. out:
  923. return rc;
  924. out_sock_put:
  925. sock_put(sk);
  926. out_clear_request:
  927. rc = 0;
  928. x25_transmit_clear_request(nb, lci, 0x01);
  929. goto out;
  930. }
  931. static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
  932. {
  933. struct sock *sk = sock->sk;
  934. struct x25_sock *x25 = x25_sk(sk);
  935. DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
  936. struct sockaddr_x25 sx25;
  937. struct sk_buff *skb;
  938. unsigned char *asmptr;
  939. int noblock = msg->msg_flags & MSG_DONTWAIT;
  940. size_t size;
  941. int qbit = 0, rc = -EINVAL;
  942. lock_sock(sk);
  943. if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
  944. goto out;
  945. /* we currently don't support segmented records at the user interface */
  946. if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
  947. goto out;
  948. rc = -EADDRNOTAVAIL;
  949. if (sock_flag(sk, SOCK_ZAPPED))
  950. goto out;
  951. rc = -EPIPE;
  952. if (sk->sk_shutdown & SEND_SHUTDOWN) {
  953. send_sig(SIGPIPE, current, 0);
  954. goto out;
  955. }
  956. rc = -ENETUNREACH;
  957. if (!x25->neighbour)
  958. goto out;
  959. if (usx25) {
  960. rc = -EINVAL;
  961. if (msg->msg_namelen < sizeof(sx25))
  962. goto out;
  963. memcpy(&sx25, usx25, sizeof(sx25));
  964. rc = -EISCONN;
  965. if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
  966. goto out;
  967. rc = -EINVAL;
  968. if (sx25.sx25_family != AF_X25)
  969. goto out;
  970. } else {
  971. /*
  972. * FIXME 1003.1g - if the socket is like this because
  973. * it has become closed (not started closed) we ought
  974. * to SIGPIPE, EPIPE;
  975. */
  976. rc = -ENOTCONN;
  977. if (sk->sk_state != TCP_ESTABLISHED)
  978. goto out;
  979. sx25.sx25_family = AF_X25;
  980. sx25.sx25_addr = x25->dest_addr;
  981. }
  982. /* Sanity check the packet size */
  983. if (len > 65535) {
  984. rc = -EMSGSIZE;
  985. goto out;
  986. }
  987. SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
  988. /* Build a packet */
  989. SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
  990. if ((msg->msg_flags & MSG_OOB) && len > 32)
  991. len = 32;
  992. size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
  993. release_sock(sk);
  994. skb = sock_alloc_send_skb(sk, size, noblock, &rc);
  995. lock_sock(sk);
  996. if (!skb)
  997. goto out;
  998. X25_SKB_CB(skb)->flags = msg->msg_flags;
  999. skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
  1000. /*
  1001. * Put the data on the end
  1002. */
  1003. SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
  1004. skb_reset_transport_header(skb);
  1005. skb_put(skb, len);
  1006. rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
  1007. if (rc)
  1008. goto out_kfree_skb;
  1009. /*
  1010. * If the Q BIT Include socket option is in force, the first
  1011. * byte of the user data is the logical value of the Q Bit.
  1012. */
  1013. if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
  1014. if (!pskb_may_pull(skb, 1))
  1015. goto out_kfree_skb;
  1016. qbit = skb->data[0];
  1017. skb_pull(skb, 1);
  1018. }
  1019. /*
  1020. * Push down the X.25 header
  1021. */
  1022. SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
  1023. if (msg->msg_flags & MSG_OOB) {
  1024. if (x25->neighbour->extended) {
  1025. asmptr = skb_push(skb, X25_STD_MIN_LEN);
  1026. *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
  1027. *asmptr++ = (x25->lci >> 0) & 0xFF;
  1028. *asmptr++ = X25_INTERRUPT;
  1029. } else {
  1030. asmptr = skb_push(skb, X25_STD_MIN_LEN);
  1031. *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
  1032. *asmptr++ = (x25->lci >> 0) & 0xFF;
  1033. *asmptr++ = X25_INTERRUPT;
  1034. }
  1035. } else {
  1036. if (x25->neighbour->extended) {
  1037. /* Build an Extended X.25 header */
  1038. asmptr = skb_push(skb, X25_EXT_MIN_LEN);
  1039. *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
  1040. *asmptr++ = (x25->lci >> 0) & 0xFF;
  1041. *asmptr++ = X25_DATA;
  1042. *asmptr++ = X25_DATA;
  1043. } else {
  1044. /* Build an Standard X.25 header */
  1045. asmptr = skb_push(skb, X25_STD_MIN_LEN);
  1046. *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
  1047. *asmptr++ = (x25->lci >> 0) & 0xFF;
  1048. *asmptr++ = X25_DATA;
  1049. }
  1050. if (qbit)
  1051. skb->data[0] |= X25_Q_BIT;
  1052. }
  1053. SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
  1054. SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
  1055. rc = -ENOTCONN;
  1056. if (sk->sk_state != TCP_ESTABLISHED)
  1057. goto out_kfree_skb;
  1058. if (msg->msg_flags & MSG_OOB)
  1059. skb_queue_tail(&x25->interrupt_out_queue, skb);
  1060. else {
  1061. rc = x25_output(sk, skb);
  1062. len = rc;
  1063. if (rc < 0)
  1064. kfree_skb(skb);
  1065. else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
  1066. len++;
  1067. }
  1068. x25_kick(sk);
  1069. rc = len;
  1070. out:
  1071. release_sock(sk);
  1072. return rc;
  1073. out_kfree_skb:
  1074. kfree_skb(skb);
  1075. goto out;
  1076. }
  1077. static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
  1078. int flags)
  1079. {
  1080. struct sock *sk = sock->sk;
  1081. struct x25_sock *x25 = x25_sk(sk);
  1082. DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
  1083. size_t copied;
  1084. int qbit, header_len;
  1085. struct sk_buff *skb;
  1086. unsigned char *asmptr;
  1087. int rc = -ENOTCONN;
  1088. lock_sock(sk);
  1089. if (x25->neighbour == NULL)
  1090. goto out;
  1091. header_len = x25->neighbour->extended ?
  1092. X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
  1093. /*
  1094. * This works for seqpacket too. The receiver has ordered the queue for
  1095. * us! We do one quick check first though
  1096. */
  1097. if (sk->sk_state != TCP_ESTABLISHED)
  1098. goto out;
  1099. if (flags & MSG_OOB) {
  1100. rc = -EINVAL;
  1101. if (sock_flag(sk, SOCK_URGINLINE) ||
  1102. !skb_peek(&x25->interrupt_in_queue))
  1103. goto out;
  1104. skb = skb_dequeue(&x25->interrupt_in_queue);
  1105. if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
  1106. goto out_free_dgram;
  1107. skb_pull(skb, X25_STD_MIN_LEN);
  1108. /*
  1109. * No Q bit information on Interrupt data.
  1110. */
  1111. if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
  1112. asmptr = skb_push(skb, 1);
  1113. *asmptr = 0x00;
  1114. }
  1115. msg->msg_flags |= MSG_OOB;
  1116. } else {
  1117. /* Now we can treat all alike */
  1118. release_sock(sk);
  1119. skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
  1120. flags & MSG_DONTWAIT, &rc);
  1121. lock_sock(sk);
  1122. if (!skb)
  1123. goto out;
  1124. if (!pskb_may_pull(skb, header_len))
  1125. goto out_free_dgram;
  1126. qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
  1127. skb_pull(skb, header_len);
  1128. if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
  1129. asmptr = skb_push(skb, 1);
  1130. *asmptr = qbit;
  1131. }
  1132. }
  1133. skb_reset_transport_header(skb);
  1134. copied = skb->len;
  1135. if (copied > size) {
  1136. copied = size;
  1137. msg->msg_flags |= MSG_TRUNC;
  1138. }
  1139. /* Currently, each datagram always contains a complete record */
  1140. msg->msg_flags |= MSG_EOR;
  1141. rc = skb_copy_datagram_msg(skb, 0, msg, copied);
  1142. if (rc)
  1143. goto out_free_dgram;
  1144. if (sx25) {
  1145. sx25->sx25_family = AF_X25;
  1146. sx25->sx25_addr = x25->dest_addr;
  1147. msg->msg_namelen = sizeof(*sx25);
  1148. }
  1149. x25_check_rbuf(sk);
  1150. rc = copied;
  1151. out_free_dgram:
  1152. skb_free_datagram(sk, skb);
  1153. out:
  1154. release_sock(sk);
  1155. return rc;
  1156. }
  1157. static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  1158. {
  1159. struct sock *sk = sock->sk;
  1160. struct x25_sock *x25 = x25_sk(sk);
  1161. void __user *argp = (void __user *)arg;
  1162. int rc;
  1163. switch (cmd) {
  1164. case TIOCOUTQ: {
  1165. int amount;
  1166. amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
  1167. if (amount < 0)
  1168. amount = 0;
  1169. rc = put_user(amount, (unsigned int __user *)argp);
  1170. break;
  1171. }
  1172. case TIOCINQ: {
  1173. struct sk_buff *skb;
  1174. int amount = 0;
  1175. /*
  1176. * These two are safe on a single CPU system as
  1177. * only user tasks fiddle here
  1178. */
  1179. lock_sock(sk);
  1180. if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
  1181. amount = skb->len;
  1182. release_sock(sk);
  1183. rc = put_user(amount, (unsigned int __user *)argp);
  1184. break;
  1185. }
  1186. case SIOCGIFADDR:
  1187. case SIOCSIFADDR:
  1188. case SIOCGIFDSTADDR:
  1189. case SIOCSIFDSTADDR:
  1190. case SIOCGIFBRDADDR:
  1191. case SIOCSIFBRDADDR:
  1192. case SIOCGIFNETMASK:
  1193. case SIOCSIFNETMASK:
  1194. case SIOCGIFMETRIC:
  1195. case SIOCSIFMETRIC:
  1196. rc = -EINVAL;
  1197. break;
  1198. case SIOCADDRT:
  1199. case SIOCDELRT:
  1200. rc = -EPERM;
  1201. if (!capable(CAP_NET_ADMIN))
  1202. break;
  1203. rc = x25_route_ioctl(cmd, argp);
  1204. break;
  1205. case SIOCX25GSUBSCRIP:
  1206. rc = x25_subscr_ioctl(cmd, argp);
  1207. break;
  1208. case SIOCX25SSUBSCRIP:
  1209. rc = -EPERM;
  1210. if (!capable(CAP_NET_ADMIN))
  1211. break;
  1212. rc = x25_subscr_ioctl(cmd, argp);
  1213. break;
  1214. case SIOCX25GFACILITIES: {
  1215. lock_sock(sk);
  1216. rc = copy_to_user(argp, &x25->facilities,
  1217. sizeof(x25->facilities))
  1218. ? -EFAULT : 0;
  1219. release_sock(sk);
  1220. break;
  1221. }
  1222. case SIOCX25SFACILITIES: {
  1223. struct x25_facilities facilities;
  1224. rc = -EFAULT;
  1225. if (copy_from_user(&facilities, argp, sizeof(facilities)))
  1226. break;
  1227. rc = -EINVAL;
  1228. lock_sock(sk);
  1229. if (sk->sk_state != TCP_LISTEN &&
  1230. sk->sk_state != TCP_CLOSE)
  1231. goto out_fac_release;
  1232. if (facilities.pacsize_in < X25_PS16 ||
  1233. facilities.pacsize_in > X25_PS4096)
  1234. goto out_fac_release;
  1235. if (facilities.pacsize_out < X25_PS16 ||
  1236. facilities.pacsize_out > X25_PS4096)
  1237. goto out_fac_release;
  1238. if (facilities.winsize_in < 1 ||
  1239. facilities.winsize_in > 127)
  1240. goto out_fac_release;
  1241. if (facilities.throughput) {
  1242. int out = facilities.throughput & 0xf0;
  1243. int in = facilities.throughput & 0x0f;
  1244. if (!out)
  1245. facilities.throughput |=
  1246. X25_DEFAULT_THROUGHPUT << 4;
  1247. else if (out < 0x30 || out > 0xD0)
  1248. goto out_fac_release;
  1249. if (!in)
  1250. facilities.throughput |=
  1251. X25_DEFAULT_THROUGHPUT;
  1252. else if (in < 0x03 || in > 0x0D)
  1253. goto out_fac_release;
  1254. }
  1255. if (facilities.reverse &&
  1256. (facilities.reverse & 0x81) != 0x81)
  1257. goto out_fac_release;
  1258. x25->facilities = facilities;
  1259. rc = 0;
  1260. out_fac_release:
  1261. release_sock(sk);
  1262. break;
  1263. }
  1264. case SIOCX25GDTEFACILITIES: {
  1265. lock_sock(sk);
  1266. rc = copy_to_user(argp, &x25->dte_facilities,
  1267. sizeof(x25->dte_facilities));
  1268. release_sock(sk);
  1269. if (rc)
  1270. rc = -EFAULT;
  1271. break;
  1272. }
  1273. case SIOCX25SDTEFACILITIES: {
  1274. struct x25_dte_facilities dtefacs;
  1275. rc = -EFAULT;
  1276. if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
  1277. break;
  1278. rc = -EINVAL;
  1279. lock_sock(sk);
  1280. if (sk->sk_state != TCP_LISTEN &&
  1281. sk->sk_state != TCP_CLOSE)
  1282. goto out_dtefac_release;
  1283. if (dtefacs.calling_len > X25_MAX_AE_LEN)
  1284. goto out_dtefac_release;
  1285. if (dtefacs.called_len > X25_MAX_AE_LEN)
  1286. goto out_dtefac_release;
  1287. x25->dte_facilities = dtefacs;
  1288. rc = 0;
  1289. out_dtefac_release:
  1290. release_sock(sk);
  1291. break;
  1292. }
  1293. case SIOCX25GCALLUSERDATA: {
  1294. lock_sock(sk);
  1295. rc = copy_to_user(argp, &x25->calluserdata,
  1296. sizeof(x25->calluserdata))
  1297. ? -EFAULT : 0;
  1298. release_sock(sk);
  1299. break;
  1300. }
  1301. case SIOCX25SCALLUSERDATA: {
  1302. struct x25_calluserdata calluserdata;
  1303. rc = -EFAULT;
  1304. if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
  1305. break;
  1306. rc = -EINVAL;
  1307. if (calluserdata.cudlength > X25_MAX_CUD_LEN)
  1308. break;
  1309. lock_sock(sk);
  1310. x25->calluserdata = calluserdata;
  1311. release_sock(sk);
  1312. rc = 0;
  1313. break;
  1314. }
  1315. case SIOCX25GCAUSEDIAG: {
  1316. lock_sock(sk);
  1317. rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
  1318. ? -EFAULT : 0;
  1319. release_sock(sk);
  1320. break;
  1321. }
  1322. case SIOCX25SCAUSEDIAG: {
  1323. struct x25_causediag causediag;
  1324. rc = -EFAULT;
  1325. if (copy_from_user(&causediag, argp, sizeof(causediag)))
  1326. break;
  1327. lock_sock(sk);
  1328. x25->causediag = causediag;
  1329. release_sock(sk);
  1330. rc = 0;
  1331. break;
  1332. }
  1333. case SIOCX25SCUDMATCHLEN: {
  1334. struct x25_subaddr sub_addr;
  1335. rc = -EINVAL;
  1336. lock_sock(sk);
  1337. if(sk->sk_state != TCP_CLOSE)
  1338. goto out_cud_release;
  1339. rc = -EFAULT;
  1340. if (copy_from_user(&sub_addr, argp,
  1341. sizeof(sub_addr)))
  1342. goto out_cud_release;
  1343. rc = -EINVAL;
  1344. if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
  1345. goto out_cud_release;
  1346. x25->cudmatchlength = sub_addr.cudmatchlength;
  1347. rc = 0;
  1348. out_cud_release:
  1349. release_sock(sk);
  1350. break;
  1351. }
  1352. case SIOCX25CALLACCPTAPPRV: {
  1353. rc = -EINVAL;
  1354. lock_sock(sk);
  1355. if (sk->sk_state == TCP_CLOSE) {
  1356. clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
  1357. rc = 0;
  1358. }
  1359. release_sock(sk);
  1360. break;
  1361. }
  1362. case SIOCX25SENDCALLACCPT: {
  1363. rc = -EINVAL;
  1364. lock_sock(sk);
  1365. if (sk->sk_state != TCP_ESTABLISHED)
  1366. goto out_sendcallaccpt_release;
  1367. /* must call accptapprv above */
  1368. if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
  1369. goto out_sendcallaccpt_release;
  1370. x25_write_internal(sk, X25_CALL_ACCEPTED);
  1371. x25->state = X25_STATE_3;
  1372. rc = 0;
  1373. out_sendcallaccpt_release:
  1374. release_sock(sk);
  1375. break;
  1376. }
  1377. default:
  1378. rc = -ENOIOCTLCMD;
  1379. break;
  1380. }
  1381. return rc;
  1382. }
  1383. static const struct net_proto_family x25_family_ops = {
  1384. .family = AF_X25,
  1385. .create = x25_create,
  1386. .owner = THIS_MODULE,
  1387. };
  1388. #ifdef CONFIG_COMPAT
  1389. static int compat_x25_subscr_ioctl(unsigned int cmd,
  1390. struct compat_x25_subscrip_struct __user *x25_subscr32)
  1391. {
  1392. struct compat_x25_subscrip_struct x25_subscr;
  1393. struct x25_neigh *nb;
  1394. struct net_device *dev;
  1395. int rc = -EINVAL;
  1396. rc = -EFAULT;
  1397. if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
  1398. goto out;
  1399. rc = -EINVAL;
  1400. dev = x25_dev_get(x25_subscr.device);
  1401. if (dev == NULL)
  1402. goto out;
  1403. nb = x25_get_neigh(dev);
  1404. if (nb == NULL)
  1405. goto out_dev_put;
  1406. dev_put(dev);
  1407. if (cmd == SIOCX25GSUBSCRIP) {
  1408. read_lock_bh(&x25_neigh_list_lock);
  1409. x25_subscr.extended = nb->extended;
  1410. x25_subscr.global_facil_mask = nb->global_facil_mask;
  1411. read_unlock_bh(&x25_neigh_list_lock);
  1412. rc = copy_to_user(x25_subscr32, &x25_subscr,
  1413. sizeof(*x25_subscr32)) ? -EFAULT : 0;
  1414. } else {
  1415. rc = -EINVAL;
  1416. if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
  1417. rc = 0;
  1418. write_lock_bh(&x25_neigh_list_lock);
  1419. nb->extended = x25_subscr.extended;
  1420. nb->global_facil_mask = x25_subscr.global_facil_mask;
  1421. write_unlock_bh(&x25_neigh_list_lock);
  1422. }
  1423. }
  1424. x25_neigh_put(nb);
  1425. out:
  1426. return rc;
  1427. out_dev_put:
  1428. dev_put(dev);
  1429. goto out;
  1430. }
  1431. static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
  1432. unsigned long arg)
  1433. {
  1434. void __user *argp = compat_ptr(arg);
  1435. int rc = -ENOIOCTLCMD;
  1436. switch(cmd) {
  1437. case TIOCOUTQ:
  1438. case TIOCINQ:
  1439. rc = x25_ioctl(sock, cmd, (unsigned long)argp);
  1440. break;
  1441. case SIOCGIFADDR:
  1442. case SIOCSIFADDR:
  1443. case SIOCGIFDSTADDR:
  1444. case SIOCSIFDSTADDR:
  1445. case SIOCGIFBRDADDR:
  1446. case SIOCSIFBRDADDR:
  1447. case SIOCGIFNETMASK:
  1448. case SIOCSIFNETMASK:
  1449. case SIOCGIFMETRIC:
  1450. case SIOCSIFMETRIC:
  1451. rc = -EINVAL;
  1452. break;
  1453. case SIOCADDRT:
  1454. case SIOCDELRT:
  1455. rc = -EPERM;
  1456. if (!capable(CAP_NET_ADMIN))
  1457. break;
  1458. rc = x25_route_ioctl(cmd, argp);
  1459. break;
  1460. case SIOCX25GSUBSCRIP:
  1461. rc = compat_x25_subscr_ioctl(cmd, argp);
  1462. break;
  1463. case SIOCX25SSUBSCRIP:
  1464. rc = -EPERM;
  1465. if (!capable(CAP_NET_ADMIN))
  1466. break;
  1467. rc = compat_x25_subscr_ioctl(cmd, argp);
  1468. break;
  1469. case SIOCX25GFACILITIES:
  1470. case SIOCX25SFACILITIES:
  1471. case SIOCX25GDTEFACILITIES:
  1472. case SIOCX25SDTEFACILITIES:
  1473. case SIOCX25GCALLUSERDATA:
  1474. case SIOCX25SCALLUSERDATA:
  1475. case SIOCX25GCAUSEDIAG:
  1476. case SIOCX25SCAUSEDIAG:
  1477. case SIOCX25SCUDMATCHLEN:
  1478. case SIOCX25CALLACCPTAPPRV:
  1479. case SIOCX25SENDCALLACCPT:
  1480. rc = x25_ioctl(sock, cmd, (unsigned long)argp);
  1481. break;
  1482. default:
  1483. rc = -ENOIOCTLCMD;
  1484. break;
  1485. }
  1486. return rc;
  1487. }
  1488. #endif
  1489. static const struct proto_ops x25_proto_ops = {
  1490. .family = AF_X25,
  1491. .owner = THIS_MODULE,
  1492. .release = x25_release,
  1493. .bind = x25_bind,
  1494. .connect = x25_connect,
  1495. .socketpair = sock_no_socketpair,
  1496. .accept = x25_accept,
  1497. .getname = x25_getname,
  1498. .poll = datagram_poll,
  1499. .ioctl = x25_ioctl,
  1500. #ifdef CONFIG_COMPAT
  1501. .compat_ioctl = compat_x25_ioctl,
  1502. #endif
  1503. .gettstamp = sock_gettstamp,
  1504. .listen = x25_listen,
  1505. .shutdown = sock_no_shutdown,
  1506. .setsockopt = x25_setsockopt,
  1507. .getsockopt = x25_getsockopt,
  1508. .sendmsg = x25_sendmsg,
  1509. .recvmsg = x25_recvmsg,
  1510. .mmap = sock_no_mmap,
  1511. .sendpage = sock_no_sendpage,
  1512. };
  1513. static struct packet_type x25_packet_type __read_mostly = {
  1514. .type = cpu_to_be16(ETH_P_X25),
  1515. .func = x25_lapb_receive_frame,
  1516. };
  1517. static struct notifier_block x25_dev_notifier = {
  1518. .notifier_call = x25_device_event,
  1519. };
  1520. void x25_kill_by_neigh(struct x25_neigh *nb)
  1521. {
  1522. struct sock *s;
  1523. write_lock_bh(&x25_list_lock);
  1524. sk_for_each(s, &x25_list) {
  1525. if (x25_sk(s)->neighbour == nb) {
  1526. write_unlock_bh(&x25_list_lock);
  1527. lock_sock(s);
  1528. x25_disconnect(s, ENETUNREACH, 0, 0);
  1529. release_sock(s);
  1530. write_lock_bh(&x25_list_lock);
  1531. }
  1532. }
  1533. write_unlock_bh(&x25_list_lock);
  1534. /* Remove any related forwards */
  1535. x25_clear_forward_by_dev(nb->dev);
  1536. }
  1537. static int __init x25_init(void)
  1538. {
  1539. int rc;
  1540. rc = proto_register(&x25_proto, 0);
  1541. if (rc)
  1542. goto out;
  1543. rc = sock_register(&x25_family_ops);
  1544. if (rc)
  1545. goto out_proto;
  1546. dev_add_pack(&x25_packet_type);
  1547. rc = register_netdevice_notifier(&x25_dev_notifier);
  1548. if (rc)
  1549. goto out_sock;
  1550. rc = x25_register_sysctl();
  1551. if (rc)
  1552. goto out_dev;
  1553. rc = x25_proc_init();
  1554. if (rc)
  1555. goto out_sysctl;
  1556. pr_info("Linux Version 0.2\n");
  1557. out:
  1558. return rc;
  1559. out_sysctl:
  1560. x25_unregister_sysctl();
  1561. out_dev:
  1562. unregister_netdevice_notifier(&x25_dev_notifier);
  1563. out_sock:
  1564. dev_remove_pack(&x25_packet_type);
  1565. sock_unregister(AF_X25);
  1566. out_proto:
  1567. proto_unregister(&x25_proto);
  1568. goto out;
  1569. }
  1570. module_init(x25_init);
  1571. static void __exit x25_exit(void)
  1572. {
  1573. x25_proc_exit();
  1574. x25_link_free();
  1575. x25_route_free();
  1576. x25_unregister_sysctl();
  1577. unregister_netdevice_notifier(&x25_dev_notifier);
  1578. dev_remove_pack(&x25_packet_type);
  1579. sock_unregister(AF_X25);
  1580. proto_unregister(&x25_proto);
  1581. }
  1582. module_exit(x25_exit);
  1583. MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
  1584. MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
  1585. MODULE_LICENSE("GPL");
  1586. MODULE_ALIAS_NETPROTO(PF_X25);