sock.c 22 KB

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  1. /*
  2. * Copyright (C) 2011 Intel Corporation. All rights reserved.
  3. *
  4. * This program is free software; you can redistribute it and/or modify
  5. * it under the terms of the GNU General Public License as published by
  6. * the Free Software Foundation; either version 2 of the License, or
  7. * (at your option) any later version.
  8. *
  9. * This program is distributed in the hope that it will be useful,
  10. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12. * GNU General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License
  15. * along with this program; if not, write to the
  16. * Free Software Foundation, Inc.,
  17. * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18. */
  19. #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
  20. #include <linux/init.h>
  21. #include <linux/kernel.h>
  22. #include <linux/module.h>
  23. #include <linux/nfc.h>
  24. #include "../nfc.h"
  25. #include "llcp.h"
  26. static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
  27. {
  28. DECLARE_WAITQUEUE(wait, current);
  29. int err = 0;
  30. pr_debug("sk %p", sk);
  31. add_wait_queue(sk_sleep(sk), &wait);
  32. set_current_state(TASK_INTERRUPTIBLE);
  33. while (sk->sk_state != state) {
  34. if (!timeo) {
  35. err = -EINPROGRESS;
  36. break;
  37. }
  38. if (signal_pending(current)) {
  39. err = sock_intr_errno(timeo);
  40. break;
  41. }
  42. release_sock(sk);
  43. timeo = schedule_timeout(timeo);
  44. lock_sock(sk);
  45. set_current_state(TASK_INTERRUPTIBLE);
  46. err = sock_error(sk);
  47. if (err)
  48. break;
  49. }
  50. __set_current_state(TASK_RUNNING);
  51. remove_wait_queue(sk_sleep(sk), &wait);
  52. return err;
  53. }
  54. static struct proto llcp_sock_proto = {
  55. .name = "NFC_LLCP",
  56. .owner = THIS_MODULE,
  57. .obj_size = sizeof(struct nfc_llcp_sock),
  58. };
  59. static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
  60. {
  61. struct sock *sk = sock->sk;
  62. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  63. struct nfc_llcp_local *local;
  64. struct nfc_dev *dev;
  65. struct sockaddr_nfc_llcp llcp_addr;
  66. int len, ret = 0;
  67. if (!addr || addr->sa_family != AF_NFC)
  68. return -EINVAL;
  69. pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
  70. memset(&llcp_addr, 0, sizeof(llcp_addr));
  71. len = min_t(unsigned int, sizeof(llcp_addr), alen);
  72. memcpy(&llcp_addr, addr, len);
  73. /* This is going to be a listening socket, dsap must be 0 */
  74. if (llcp_addr.dsap != 0)
  75. return -EINVAL;
  76. lock_sock(sk);
  77. if (sk->sk_state != LLCP_CLOSED) {
  78. ret = -EBADFD;
  79. goto error;
  80. }
  81. dev = nfc_get_device(llcp_addr.dev_idx);
  82. if (dev == NULL) {
  83. ret = -ENODEV;
  84. goto error;
  85. }
  86. local = nfc_llcp_find_local(dev);
  87. if (local == NULL) {
  88. ret = -ENODEV;
  89. goto put_dev;
  90. }
  91. llcp_sock->dev = dev;
  92. llcp_sock->local = nfc_llcp_local_get(local);
  93. llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
  94. llcp_sock->service_name_len = min_t(unsigned int,
  95. llcp_addr.service_name_len,
  96. NFC_LLCP_MAX_SERVICE_NAME);
  97. llcp_sock->service_name = kmemdup(llcp_addr.service_name,
  98. llcp_sock->service_name_len,
  99. GFP_KERNEL);
  100. llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
  101. if (llcp_sock->ssap == LLCP_SAP_MAX) {
  102. ret = -EADDRINUSE;
  103. goto put_dev;
  104. }
  105. llcp_sock->reserved_ssap = llcp_sock->ssap;
  106. nfc_llcp_sock_link(&local->sockets, sk);
  107. pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
  108. sk->sk_state = LLCP_BOUND;
  109. put_dev:
  110. nfc_put_device(dev);
  111. error:
  112. release_sock(sk);
  113. return ret;
  114. }
  115. static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
  116. int alen)
  117. {
  118. struct sock *sk = sock->sk;
  119. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  120. struct nfc_llcp_local *local;
  121. struct nfc_dev *dev;
  122. struct sockaddr_nfc_llcp llcp_addr;
  123. int len, ret = 0;
  124. if (!addr || addr->sa_family != AF_NFC)
  125. return -EINVAL;
  126. pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
  127. memset(&llcp_addr, 0, sizeof(llcp_addr));
  128. len = min_t(unsigned int, sizeof(llcp_addr), alen);
  129. memcpy(&llcp_addr, addr, len);
  130. lock_sock(sk);
  131. if (sk->sk_state != LLCP_CLOSED) {
  132. ret = -EBADFD;
  133. goto error;
  134. }
  135. dev = nfc_get_device(llcp_addr.dev_idx);
  136. if (dev == NULL) {
  137. ret = -ENODEV;
  138. goto error;
  139. }
  140. local = nfc_llcp_find_local(dev);
  141. if (local == NULL) {
  142. ret = -ENODEV;
  143. goto put_dev;
  144. }
  145. llcp_sock->dev = dev;
  146. llcp_sock->local = nfc_llcp_local_get(local);
  147. llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
  148. nfc_llcp_sock_link(&local->raw_sockets, sk);
  149. sk->sk_state = LLCP_BOUND;
  150. put_dev:
  151. nfc_put_device(dev);
  152. error:
  153. release_sock(sk);
  154. return ret;
  155. }
  156. static int llcp_sock_listen(struct socket *sock, int backlog)
  157. {
  158. struct sock *sk = sock->sk;
  159. int ret = 0;
  160. pr_debug("sk %p backlog %d\n", sk, backlog);
  161. lock_sock(sk);
  162. if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
  163. sk->sk_state != LLCP_BOUND) {
  164. ret = -EBADFD;
  165. goto error;
  166. }
  167. sk->sk_max_ack_backlog = backlog;
  168. sk->sk_ack_backlog = 0;
  169. pr_debug("Socket listening\n");
  170. sk->sk_state = LLCP_LISTEN;
  171. error:
  172. release_sock(sk);
  173. return ret;
  174. }
  175. static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
  176. char __user *optval, unsigned int optlen)
  177. {
  178. struct sock *sk = sock->sk;
  179. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  180. u32 opt;
  181. int err = 0;
  182. pr_debug("%p optname %d\n", sk, optname);
  183. if (level != SOL_NFC)
  184. return -ENOPROTOOPT;
  185. lock_sock(sk);
  186. switch (optname) {
  187. case NFC_LLCP_RW:
  188. if (sk->sk_state == LLCP_CONNECTED ||
  189. sk->sk_state == LLCP_BOUND ||
  190. sk->sk_state == LLCP_LISTEN) {
  191. err = -EINVAL;
  192. break;
  193. }
  194. if (get_user(opt, (u32 __user *) optval)) {
  195. err = -EFAULT;
  196. break;
  197. }
  198. if (opt > LLCP_MAX_RW) {
  199. err = -EINVAL;
  200. break;
  201. }
  202. llcp_sock->rw = (u8) opt;
  203. break;
  204. case NFC_LLCP_MIUX:
  205. if (sk->sk_state == LLCP_CONNECTED ||
  206. sk->sk_state == LLCP_BOUND ||
  207. sk->sk_state == LLCP_LISTEN) {
  208. err = -EINVAL;
  209. break;
  210. }
  211. if (get_user(opt, (u32 __user *) optval)) {
  212. err = -EFAULT;
  213. break;
  214. }
  215. if (opt > LLCP_MAX_MIUX) {
  216. err = -EINVAL;
  217. break;
  218. }
  219. llcp_sock->miux = cpu_to_be16((u16) opt);
  220. break;
  221. default:
  222. err = -ENOPROTOOPT;
  223. break;
  224. }
  225. release_sock(sk);
  226. pr_debug("%p rw %d miux %d\n", llcp_sock,
  227. llcp_sock->rw, llcp_sock->miux);
  228. return err;
  229. }
  230. static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
  231. char __user *optval, int __user *optlen)
  232. {
  233. struct nfc_llcp_local *local;
  234. struct sock *sk = sock->sk;
  235. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  236. int len, err = 0;
  237. u16 miux, remote_miu;
  238. u8 rw;
  239. pr_debug("%p optname %d\n", sk, optname);
  240. if (level != SOL_NFC)
  241. return -ENOPROTOOPT;
  242. if (get_user(len, optlen))
  243. return -EFAULT;
  244. local = llcp_sock->local;
  245. if (!local)
  246. return -ENODEV;
  247. len = min_t(u32, len, sizeof(u32));
  248. lock_sock(sk);
  249. switch (optname) {
  250. case NFC_LLCP_RW:
  251. rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
  252. if (put_user(rw, (u32 __user *) optval))
  253. err = -EFAULT;
  254. break;
  255. case NFC_LLCP_MIUX:
  256. miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
  257. be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
  258. if (put_user(miux, (u32 __user *) optval))
  259. err = -EFAULT;
  260. break;
  261. case NFC_LLCP_REMOTE_MIU:
  262. remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
  263. local->remote_miu : llcp_sock->remote_miu;
  264. if (put_user(remote_miu, (u32 __user *) optval))
  265. err = -EFAULT;
  266. break;
  267. case NFC_LLCP_REMOTE_LTO:
  268. if (put_user(local->remote_lto / 10, (u32 __user *) optval))
  269. err = -EFAULT;
  270. break;
  271. case NFC_LLCP_REMOTE_RW:
  272. if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
  273. err = -EFAULT;
  274. break;
  275. default:
  276. err = -ENOPROTOOPT;
  277. break;
  278. }
  279. release_sock(sk);
  280. if (put_user(len, optlen))
  281. return -EFAULT;
  282. return err;
  283. }
  284. void nfc_llcp_accept_unlink(struct sock *sk)
  285. {
  286. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  287. pr_debug("state %d\n", sk->sk_state);
  288. list_del_init(&llcp_sock->accept_queue);
  289. sk_acceptq_removed(llcp_sock->parent);
  290. llcp_sock->parent = NULL;
  291. sock_put(sk);
  292. }
  293. void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
  294. {
  295. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  296. struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
  297. /* Lock will be free from unlink */
  298. sock_hold(sk);
  299. list_add_tail(&llcp_sock->accept_queue,
  300. &llcp_sock_parent->accept_queue);
  301. llcp_sock->parent = parent;
  302. sk_acceptq_added(parent);
  303. }
  304. struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
  305. struct socket *newsock)
  306. {
  307. struct nfc_llcp_sock *lsk, *n, *llcp_parent;
  308. struct sock *sk;
  309. llcp_parent = nfc_llcp_sock(parent);
  310. list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
  311. accept_queue) {
  312. sk = &lsk->sk;
  313. lock_sock(sk);
  314. if (sk->sk_state == LLCP_CLOSED) {
  315. release_sock(sk);
  316. nfc_llcp_accept_unlink(sk);
  317. continue;
  318. }
  319. if (sk->sk_state == LLCP_CONNECTED || !newsock) {
  320. list_del_init(&lsk->accept_queue);
  321. sock_put(sk);
  322. if (newsock)
  323. sock_graft(sk, newsock);
  324. release_sock(sk);
  325. pr_debug("Returning sk state %d\n", sk->sk_state);
  326. sk_acceptq_removed(parent);
  327. return sk;
  328. }
  329. release_sock(sk);
  330. }
  331. return NULL;
  332. }
  333. static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
  334. int flags)
  335. {
  336. DECLARE_WAITQUEUE(wait, current);
  337. struct sock *sk = sock->sk, *new_sk;
  338. long timeo;
  339. int ret = 0;
  340. pr_debug("parent %p\n", sk);
  341. lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
  342. if (sk->sk_state != LLCP_LISTEN) {
  343. ret = -EBADFD;
  344. goto error;
  345. }
  346. timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
  347. /* Wait for an incoming connection. */
  348. add_wait_queue_exclusive(sk_sleep(sk), &wait);
  349. while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
  350. set_current_state(TASK_INTERRUPTIBLE);
  351. if (!timeo) {
  352. ret = -EAGAIN;
  353. break;
  354. }
  355. if (signal_pending(current)) {
  356. ret = sock_intr_errno(timeo);
  357. break;
  358. }
  359. release_sock(sk);
  360. timeo = schedule_timeout(timeo);
  361. lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
  362. }
  363. __set_current_state(TASK_RUNNING);
  364. remove_wait_queue(sk_sleep(sk), &wait);
  365. if (ret)
  366. goto error;
  367. newsock->state = SS_CONNECTED;
  368. pr_debug("new socket %p\n", new_sk);
  369. error:
  370. release_sock(sk);
  371. return ret;
  372. }
  373. static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
  374. int *len, int peer)
  375. {
  376. struct sock *sk = sock->sk;
  377. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  378. DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
  379. if (llcp_sock == NULL || llcp_sock->dev == NULL)
  380. return -EBADFD;
  381. pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
  382. llcp_sock->dsap, llcp_sock->ssap);
  383. uaddr->sa_family = AF_NFC;
  384. *len = sizeof(struct sockaddr_nfc_llcp);
  385. llcp_addr->dev_idx = llcp_sock->dev->idx;
  386. llcp_addr->target_idx = llcp_sock->target_idx;
  387. llcp_addr->dsap = llcp_sock->dsap;
  388. llcp_addr->ssap = llcp_sock->ssap;
  389. llcp_addr->service_name_len = llcp_sock->service_name_len;
  390. memcpy(llcp_addr->service_name, llcp_sock->service_name,
  391. llcp_addr->service_name_len);
  392. return 0;
  393. }
  394. static inline unsigned int llcp_accept_poll(struct sock *parent)
  395. {
  396. struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
  397. struct sock *sk;
  398. parent_sock = nfc_llcp_sock(parent);
  399. list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
  400. accept_queue) {
  401. sk = &llcp_sock->sk;
  402. if (sk->sk_state == LLCP_CONNECTED)
  403. return POLLIN | POLLRDNORM;
  404. }
  405. return 0;
  406. }
  407. static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
  408. poll_table *wait)
  409. {
  410. struct sock *sk = sock->sk;
  411. unsigned int mask = 0;
  412. pr_debug("%p\n", sk);
  413. sock_poll_wait(file, sk_sleep(sk), wait);
  414. if (sk->sk_state == LLCP_LISTEN)
  415. return llcp_accept_poll(sk);
  416. if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
  417. mask |= POLLERR;
  418. if (!skb_queue_empty(&sk->sk_receive_queue))
  419. mask |= POLLIN | POLLRDNORM;
  420. if (sk->sk_state == LLCP_CLOSED)
  421. mask |= POLLHUP;
  422. if (sk->sk_shutdown & RCV_SHUTDOWN)
  423. mask |= POLLRDHUP | POLLIN | POLLRDNORM;
  424. if (sk->sk_shutdown == SHUTDOWN_MASK)
  425. mask |= POLLHUP;
  426. if (sock_writeable(sk))
  427. mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
  428. else
  429. set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
  430. pr_debug("mask 0x%x\n", mask);
  431. return mask;
  432. }
  433. static int llcp_sock_release(struct socket *sock)
  434. {
  435. struct sock *sk = sock->sk;
  436. struct nfc_llcp_local *local;
  437. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  438. int err = 0;
  439. if (!sk)
  440. return 0;
  441. pr_debug("%p\n", sk);
  442. local = llcp_sock->local;
  443. if (local == NULL) {
  444. err = -ENODEV;
  445. goto out;
  446. }
  447. lock_sock(sk);
  448. /* Send a DISC */
  449. if (sk->sk_state == LLCP_CONNECTED)
  450. nfc_llcp_disconnect(llcp_sock);
  451. if (sk->sk_state == LLCP_LISTEN) {
  452. struct nfc_llcp_sock *lsk, *n;
  453. struct sock *accept_sk;
  454. list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
  455. accept_queue) {
  456. accept_sk = &lsk->sk;
  457. lock_sock(accept_sk);
  458. nfc_llcp_disconnect(lsk);
  459. nfc_llcp_accept_unlink(accept_sk);
  460. release_sock(accept_sk);
  461. }
  462. }
  463. if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
  464. nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
  465. release_sock(sk);
  466. if (sock->type == SOCK_RAW)
  467. nfc_llcp_sock_unlink(&local->raw_sockets, sk);
  468. else
  469. nfc_llcp_sock_unlink(&local->sockets, sk);
  470. out:
  471. sock_orphan(sk);
  472. sock_put(sk);
  473. return err;
  474. }
  475. static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
  476. int len, int flags)
  477. {
  478. struct sock *sk = sock->sk;
  479. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  480. struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
  481. struct nfc_dev *dev;
  482. struct nfc_llcp_local *local;
  483. int ret = 0;
  484. pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
  485. if (!addr || len < sizeof(struct sockaddr_nfc) ||
  486. addr->sa_family != AF_NFC)
  487. return -EINVAL;
  488. if (addr->service_name_len == 0 && addr->dsap == 0)
  489. return -EINVAL;
  490. pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
  491. addr->target_idx, addr->nfc_protocol);
  492. lock_sock(sk);
  493. if (sk->sk_state == LLCP_CONNECTED) {
  494. ret = -EISCONN;
  495. goto error;
  496. }
  497. dev = nfc_get_device(addr->dev_idx);
  498. if (dev == NULL) {
  499. ret = -ENODEV;
  500. goto error;
  501. }
  502. local = nfc_llcp_find_local(dev);
  503. if (local == NULL) {
  504. ret = -ENODEV;
  505. goto put_dev;
  506. }
  507. device_lock(&dev->dev);
  508. if (dev->dep_link_up == false) {
  509. ret = -ENOLINK;
  510. device_unlock(&dev->dev);
  511. goto put_dev;
  512. }
  513. device_unlock(&dev->dev);
  514. if (local->rf_mode == NFC_RF_INITIATOR &&
  515. addr->target_idx != local->target_idx) {
  516. ret = -ENOLINK;
  517. goto put_dev;
  518. }
  519. llcp_sock->dev = dev;
  520. llcp_sock->local = nfc_llcp_local_get(local);
  521. llcp_sock->remote_miu = llcp_sock->local->remote_miu;
  522. llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
  523. if (llcp_sock->ssap == LLCP_SAP_MAX) {
  524. ret = -ENOMEM;
  525. goto put_dev;
  526. }
  527. llcp_sock->reserved_ssap = llcp_sock->ssap;
  528. if (addr->service_name_len == 0)
  529. llcp_sock->dsap = addr->dsap;
  530. else
  531. llcp_sock->dsap = LLCP_SAP_SDP;
  532. llcp_sock->nfc_protocol = addr->nfc_protocol;
  533. llcp_sock->service_name_len = min_t(unsigned int,
  534. addr->service_name_len,
  535. NFC_LLCP_MAX_SERVICE_NAME);
  536. llcp_sock->service_name = kmemdup(addr->service_name,
  537. llcp_sock->service_name_len,
  538. GFP_KERNEL);
  539. nfc_llcp_sock_link(&local->connecting_sockets, sk);
  540. ret = nfc_llcp_send_connect(llcp_sock);
  541. if (ret)
  542. goto sock_unlink;
  543. ret = sock_wait_state(sk, LLCP_CONNECTED,
  544. sock_sndtimeo(sk, flags & O_NONBLOCK));
  545. if (ret)
  546. goto sock_unlink;
  547. release_sock(sk);
  548. return 0;
  549. sock_unlink:
  550. nfc_llcp_put_ssap(local, llcp_sock->ssap);
  551. nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
  552. put_dev:
  553. nfc_put_device(dev);
  554. error:
  555. release_sock(sk);
  556. return ret;
  557. }
  558. static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
  559. struct msghdr *msg, size_t len)
  560. {
  561. struct sock *sk = sock->sk;
  562. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  563. int ret;
  564. pr_debug("sock %p sk %p", sock, sk);
  565. ret = sock_error(sk);
  566. if (ret)
  567. return ret;
  568. if (msg->msg_flags & MSG_OOB)
  569. return -EOPNOTSUPP;
  570. lock_sock(sk);
  571. if (sk->sk_type == SOCK_DGRAM) {
  572. struct sockaddr_nfc_llcp *addr =
  573. (struct sockaddr_nfc_llcp *)msg->msg_name;
  574. if (msg->msg_namelen < sizeof(*addr)) {
  575. release_sock(sk);
  576. return -EINVAL;
  577. }
  578. release_sock(sk);
  579. return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
  580. msg, len);
  581. }
  582. if (sk->sk_state != LLCP_CONNECTED) {
  583. release_sock(sk);
  584. return -ENOTCONN;
  585. }
  586. release_sock(sk);
  587. return nfc_llcp_send_i_frame(llcp_sock, msg, len);
  588. }
  589. static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
  590. struct msghdr *msg, size_t len, int flags)
  591. {
  592. int noblock = flags & MSG_DONTWAIT;
  593. struct sock *sk = sock->sk;
  594. unsigned int copied, rlen;
  595. struct sk_buff *skb, *cskb;
  596. int err = 0;
  597. pr_debug("%p %zu\n", sk, len);
  598. lock_sock(sk);
  599. if (sk->sk_state == LLCP_CLOSED &&
  600. skb_queue_empty(&sk->sk_receive_queue)) {
  601. release_sock(sk);
  602. return 0;
  603. }
  604. release_sock(sk);
  605. if (flags & (MSG_OOB))
  606. return -EOPNOTSUPP;
  607. skb = skb_recv_datagram(sk, flags, noblock, &err);
  608. if (!skb) {
  609. pr_err("Recv datagram failed state %d %d %d",
  610. sk->sk_state, err, sock_error(sk));
  611. if (sk->sk_shutdown & RCV_SHUTDOWN)
  612. return 0;
  613. return err;
  614. }
  615. rlen = skb->len; /* real length of skb */
  616. copied = min_t(unsigned int, rlen, len);
  617. cskb = skb;
  618. if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
  619. if (!(flags & MSG_PEEK))
  620. skb_queue_head(&sk->sk_receive_queue, skb);
  621. return -EFAULT;
  622. }
  623. sock_recv_timestamp(msg, sk, skb);
  624. if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
  625. struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
  626. struct sockaddr_nfc_llcp *sockaddr =
  627. (struct sockaddr_nfc_llcp *) msg->msg_name;
  628. msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
  629. pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
  630. sockaddr->sa_family = AF_NFC;
  631. sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
  632. sockaddr->dsap = ui_cb->dsap;
  633. sockaddr->ssap = ui_cb->ssap;
  634. }
  635. /* Mark read part of skb as used */
  636. if (!(flags & MSG_PEEK)) {
  637. /* SOCK_STREAM: re-queue skb if it contains unreceived data */
  638. if (sk->sk_type == SOCK_STREAM ||
  639. sk->sk_type == SOCK_DGRAM ||
  640. sk->sk_type == SOCK_RAW) {
  641. skb_pull(skb, copied);
  642. if (skb->len) {
  643. skb_queue_head(&sk->sk_receive_queue, skb);
  644. goto done;
  645. }
  646. }
  647. kfree_skb(skb);
  648. }
  649. /* XXX Queue backlogged skbs */
  650. done:
  651. /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
  652. if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
  653. copied = rlen;
  654. return copied;
  655. }
  656. static const struct proto_ops llcp_sock_ops = {
  657. .family = PF_NFC,
  658. .owner = THIS_MODULE,
  659. .bind = llcp_sock_bind,
  660. .connect = llcp_sock_connect,
  661. .release = llcp_sock_release,
  662. .socketpair = sock_no_socketpair,
  663. .accept = llcp_sock_accept,
  664. .getname = llcp_sock_getname,
  665. .poll = llcp_sock_poll,
  666. .ioctl = sock_no_ioctl,
  667. .listen = llcp_sock_listen,
  668. .shutdown = sock_no_shutdown,
  669. .setsockopt = nfc_llcp_setsockopt,
  670. .getsockopt = nfc_llcp_getsockopt,
  671. .sendmsg = llcp_sock_sendmsg,
  672. .recvmsg = llcp_sock_recvmsg,
  673. .mmap = sock_no_mmap,
  674. };
  675. static const struct proto_ops llcp_rawsock_ops = {
  676. .family = PF_NFC,
  677. .owner = THIS_MODULE,
  678. .bind = llcp_raw_sock_bind,
  679. .connect = sock_no_connect,
  680. .release = llcp_sock_release,
  681. .socketpair = sock_no_socketpair,
  682. .accept = sock_no_accept,
  683. .getname = llcp_sock_getname,
  684. .poll = llcp_sock_poll,
  685. .ioctl = sock_no_ioctl,
  686. .listen = sock_no_listen,
  687. .shutdown = sock_no_shutdown,
  688. .setsockopt = sock_no_setsockopt,
  689. .getsockopt = sock_no_getsockopt,
  690. .sendmsg = sock_no_sendmsg,
  691. .recvmsg = llcp_sock_recvmsg,
  692. .mmap = sock_no_mmap,
  693. };
  694. static void llcp_sock_destruct(struct sock *sk)
  695. {
  696. struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  697. pr_debug("%p\n", sk);
  698. if (sk->sk_state == LLCP_CONNECTED)
  699. nfc_put_device(llcp_sock->dev);
  700. skb_queue_purge(&sk->sk_receive_queue);
  701. nfc_llcp_sock_free(llcp_sock);
  702. if (!sock_flag(sk, SOCK_DEAD)) {
  703. pr_err("Freeing alive NFC LLCP socket %p\n", sk);
  704. return;
  705. }
  706. }
  707. struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
  708. {
  709. struct sock *sk;
  710. struct nfc_llcp_sock *llcp_sock;
  711. sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
  712. if (!sk)
  713. return NULL;
  714. llcp_sock = nfc_llcp_sock(sk);
  715. sock_init_data(sock, sk);
  716. sk->sk_state = LLCP_CLOSED;
  717. sk->sk_protocol = NFC_SOCKPROTO_LLCP;
  718. sk->sk_type = type;
  719. sk->sk_destruct = llcp_sock_destruct;
  720. llcp_sock->ssap = 0;
  721. llcp_sock->dsap = LLCP_SAP_SDP;
  722. llcp_sock->rw = LLCP_MAX_RW + 1;
  723. llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
  724. llcp_sock->send_n = llcp_sock->send_ack_n = 0;
  725. llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
  726. llcp_sock->remote_ready = 1;
  727. llcp_sock->reserved_ssap = LLCP_SAP_MAX;
  728. nfc_llcp_socket_remote_param_init(llcp_sock);
  729. skb_queue_head_init(&llcp_sock->tx_queue);
  730. skb_queue_head_init(&llcp_sock->tx_pending_queue);
  731. INIT_LIST_HEAD(&llcp_sock->accept_queue);
  732. if (sock != NULL)
  733. sock->state = SS_UNCONNECTED;
  734. return sk;
  735. }
  736. void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
  737. {
  738. kfree(sock->service_name);
  739. skb_queue_purge(&sock->tx_queue);
  740. skb_queue_purge(&sock->tx_pending_queue);
  741. list_del_init(&sock->accept_queue);
  742. sock->parent = NULL;
  743. nfc_llcp_local_put(sock->local);
  744. }
  745. static int llcp_sock_create(struct net *net, struct socket *sock,
  746. const struct nfc_protocol *nfc_proto)
  747. {
  748. struct sock *sk;
  749. pr_debug("%p\n", sock);
  750. if (sock->type != SOCK_STREAM &&
  751. sock->type != SOCK_DGRAM &&
  752. sock->type != SOCK_RAW)
  753. return -ESOCKTNOSUPPORT;
  754. if (sock->type == SOCK_RAW)
  755. sock->ops = &llcp_rawsock_ops;
  756. else
  757. sock->ops = &llcp_sock_ops;
  758. sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
  759. if (sk == NULL)
  760. return -ENOMEM;
  761. return 0;
  762. }
  763. static const struct nfc_protocol llcp_nfc_proto = {
  764. .id = NFC_SOCKPROTO_LLCP,
  765. .proto = &llcp_sock_proto,
  766. .owner = THIS_MODULE,
  767. .create = llcp_sock_create
  768. };
  769. int __init nfc_llcp_sock_init(void)
  770. {
  771. return nfc_proto_register(&llcp_nfc_proto);
  772. }
  773. void nfc_llcp_sock_exit(void)
  774. {
  775. nfc_proto_unregister(&llcp_nfc_proto);
  776. }