socket.c 83 KB

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  1. /*
  2. * NET An implementation of the SOCKET network access protocol.
  3. *
  4. * Version: @(#)socket.c 1.1.93 18/02/95
  5. *
  6. * Authors: Orest Zborowski, <obz@Kodak.COM>
  7. * Ross Biro
  8. * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  9. *
  10. * Fixes:
  11. * Anonymous : NOTSOCK/BADF cleanup. Error fix in
  12. * shutdown()
  13. * Alan Cox : verify_area() fixes
  14. * Alan Cox : Removed DDI
  15. * Jonathan Kamens : SOCK_DGRAM reconnect bug
  16. * Alan Cox : Moved a load of checks to the very
  17. * top level.
  18. * Alan Cox : Move address structures to/from user
  19. * mode above the protocol layers.
  20. * Rob Janssen : Allow 0 length sends.
  21. * Alan Cox : Asynchronous I/O support (cribbed from the
  22. * tty drivers).
  23. * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
  24. * Jeff Uphoff : Made max number of sockets command-line
  25. * configurable.
  26. * Matti Aarnio : Made the number of sockets dynamic,
  27. * to be allocated when needed, and mr.
  28. * Uphoff's max is used as max to be
  29. * allowed to allocate.
  30. * Linus : Argh. removed all the socket allocation
  31. * altogether: it's in the inode now.
  32. * Alan Cox : Made sock_alloc()/sock_release() public
  33. * for NetROM and future kernel nfsd type
  34. * stuff.
  35. * Alan Cox : sendmsg/recvmsg basics.
  36. * Tom Dyas : Export net symbols.
  37. * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
  38. * Alan Cox : Added thread locking to sys_* calls
  39. * for sockets. May have errors at the
  40. * moment.
  41. * Kevin Buhr : Fixed the dumb errors in the above.
  42. * Andi Kleen : Some small cleanups, optimizations,
  43. * and fixed a copy_from_user() bug.
  44. * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
  45. * Tigran Aivazian : Made listen(2) backlog sanity checks
  46. * protocol-independent
  47. *
  48. *
  49. * This program is free software; you can redistribute it and/or
  50. * modify it under the terms of the GNU General Public License
  51. * as published by the Free Software Foundation; either version
  52. * 2 of the License, or (at your option) any later version.
  53. *
  54. *
  55. * This module is effectively the top level interface to the BSD socket
  56. * paradigm.
  57. *
  58. * Based upon Swansea University Computer Society NET3.039
  59. */
  60. #include <linux/mm.h>
  61. #include <linux/socket.h>
  62. #include <linux/file.h>
  63. #include <linux/net.h>
  64. #include <linux/interrupt.h>
  65. #include <linux/thread_info.h>
  66. #include <linux/rcupdate.h>
  67. #include <linux/netdevice.h>
  68. #include <linux/proc_fs.h>
  69. #include <linux/seq_file.h>
  70. #include <linux/mutex.h>
  71. #include <linux/wanrouter.h>
  72. #include <linux/if_bridge.h>
  73. #include <linux/if_frad.h>
  74. #include <linux/if_vlan.h>
  75. #include <linux/init.h>
  76. #include <linux/poll.h>
  77. #include <linux/cache.h>
  78. #include <linux/module.h>
  79. #include <linux/highmem.h>
  80. #include <linux/mount.h>
  81. #include <linux/security.h>
  82. #include <linux/syscalls.h>
  83. #include <linux/compat.h>
  84. #include <linux/kmod.h>
  85. #include <linux/audit.h>
  86. #include <linux/wireless.h>
  87. #include <linux/nsproxy.h>
  88. #include <linux/magic.h>
  89. #include <linux/slab.h>
  90. #include <linux/xattr.h>
  91. #include <asm/uaccess.h>
  92. #include <asm/unistd.h>
  93. #include <net/compat.h>
  94. #include <net/wext.h>
  95. #include <net/cls_cgroup.h>
  96. #include <net/sock.h>
  97. #include <linux/netfilter.h>
  98. #include <linux/if_tun.h>
  99. #include <linux/ipv6_route.h>
  100. #include <linux/route.h>
  101. #include <linux/sockios.h>
  102. #include <linux/atalk.h>
  103. static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
  104. static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
  105. unsigned long nr_segs, loff_t pos);
  106. static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
  107. unsigned long nr_segs, loff_t pos);
  108. static int sock_mmap(struct file *file, struct vm_area_struct *vma);
  109. static int sock_close(struct inode *inode, struct file *file);
  110. static unsigned int sock_poll(struct file *file,
  111. struct poll_table_struct *wait);
  112. static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  113. #ifdef CONFIG_COMPAT
  114. static long compat_sock_ioctl(struct file *file,
  115. unsigned int cmd, unsigned long arg);
  116. #endif
  117. static int sock_fasync(int fd, struct file *filp, int on);
  118. static ssize_t sock_sendpage(struct file *file, struct page *page,
  119. int offset, size_t size, loff_t *ppos, int more);
  120. static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
  121. struct pipe_inode_info *pipe, size_t len,
  122. unsigned int flags);
  123. /*
  124. * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
  125. * in the operation structures but are done directly via the socketcall() multiplexor.
  126. */
  127. static const struct file_operations socket_file_ops = {
  128. .owner = THIS_MODULE,
  129. .llseek = no_llseek,
  130. .aio_read = sock_aio_read,
  131. .aio_write = sock_aio_write,
  132. .poll = sock_poll,
  133. .unlocked_ioctl = sock_ioctl,
  134. #ifdef CONFIG_COMPAT
  135. .compat_ioctl = compat_sock_ioctl,
  136. #endif
  137. .mmap = sock_mmap,
  138. .open = sock_no_open, /* special open code to disallow open via /proc */
  139. .release = sock_close,
  140. .fasync = sock_fasync,
  141. .sendpage = sock_sendpage,
  142. .splice_write = generic_splice_sendpage,
  143. .splice_read = sock_splice_read,
  144. };
  145. /*
  146. * The protocol list. Each protocol is registered in here.
  147. */
  148. static DEFINE_SPINLOCK(net_family_lock);
  149. static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
  150. /*
  151. * Statistics counters of the socket lists
  152. */
  153. static DEFINE_PER_CPU(int, sockets_in_use);
  154. /*
  155. * Support routines.
  156. * Move socket addresses back and forth across the kernel/user
  157. * divide and look after the messy bits.
  158. */
  159. /**
  160. * move_addr_to_kernel - copy a socket address into kernel space
  161. * @uaddr: Address in user space
  162. * @kaddr: Address in kernel space
  163. * @ulen: Length in user space
  164. *
  165. * The address is copied into kernel space. If the provided address is
  166. * too long an error code of -EINVAL is returned. If the copy gives
  167. * invalid addresses -EFAULT is returned. On a success 0 is returned.
  168. */
  169. int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
  170. {
  171. if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
  172. return -EINVAL;
  173. if (ulen == 0)
  174. return 0;
  175. if (copy_from_user(kaddr, uaddr, ulen))
  176. return -EFAULT;
  177. return audit_sockaddr(ulen, kaddr);
  178. }
  179. /**
  180. * move_addr_to_user - copy an address to user space
  181. * @kaddr: kernel space address
  182. * @klen: length of address in kernel
  183. * @uaddr: user space address
  184. * @ulen: pointer to user length field
  185. *
  186. * The value pointed to by ulen on entry is the buffer length available.
  187. * This is overwritten with the buffer space used. -EINVAL is returned
  188. * if an overlong buffer is specified or a negative buffer size. -EFAULT
  189. * is returned if either the buffer or the length field are not
  190. * accessible.
  191. * After copying the data up to the limit the user specifies, the true
  192. * length of the data is written over the length limit the user
  193. * specified. Zero is returned for a success.
  194. */
  195. static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
  196. void __user *uaddr, int __user *ulen)
  197. {
  198. int err;
  199. int len;
  200. err = get_user(len, ulen);
  201. if (err)
  202. return err;
  203. if (len > klen)
  204. len = klen;
  205. if (len < 0 || len > sizeof(struct sockaddr_storage))
  206. return -EINVAL;
  207. if (len) {
  208. if (audit_sockaddr(klen, kaddr))
  209. return -ENOMEM;
  210. if (copy_to_user(uaddr, kaddr, len))
  211. return -EFAULT;
  212. }
  213. /*
  214. * "fromlen shall refer to the value before truncation.."
  215. * 1003.1g
  216. */
  217. return __put_user(klen, ulen);
  218. }
  219. static struct kmem_cache *sock_inode_cachep __read_mostly;
  220. static struct inode *sock_alloc_inode(struct super_block *sb)
  221. {
  222. struct socket_alloc *ei;
  223. struct socket_wq *wq;
  224. ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
  225. if (!ei)
  226. return NULL;
  227. wq = kmalloc(sizeof(*wq), GFP_KERNEL);
  228. if (!wq) {
  229. kmem_cache_free(sock_inode_cachep, ei);
  230. return NULL;
  231. }
  232. init_waitqueue_head(&wq->wait);
  233. wq->fasync_list = NULL;
  234. RCU_INIT_POINTER(ei->socket.wq, wq);
  235. ei->socket.state = SS_UNCONNECTED;
  236. ei->socket.flags = 0;
  237. ei->socket.ops = NULL;
  238. ei->socket.sk = NULL;
  239. ei->socket.file = NULL;
  240. return &ei->vfs_inode;
  241. }
  242. static void sock_destroy_inode(struct inode *inode)
  243. {
  244. struct socket_alloc *ei;
  245. struct socket_wq *wq;
  246. ei = container_of(inode, struct socket_alloc, vfs_inode);
  247. wq = rcu_dereference_protected(ei->socket.wq, 1);
  248. kfree_rcu(wq, rcu);
  249. kmem_cache_free(sock_inode_cachep, ei);
  250. }
  251. static void init_once(void *foo)
  252. {
  253. struct socket_alloc *ei = (struct socket_alloc *)foo;
  254. inode_init_once(&ei->vfs_inode);
  255. }
  256. static int init_inodecache(void)
  257. {
  258. sock_inode_cachep = kmem_cache_create("sock_inode_cache",
  259. sizeof(struct socket_alloc),
  260. 0,
  261. (SLAB_HWCACHE_ALIGN |
  262. SLAB_RECLAIM_ACCOUNT |
  263. SLAB_MEM_SPREAD),
  264. init_once);
  265. if (sock_inode_cachep == NULL)
  266. return -ENOMEM;
  267. return 0;
  268. }
  269. static const struct super_operations sockfs_ops = {
  270. .alloc_inode = sock_alloc_inode,
  271. .destroy_inode = sock_destroy_inode,
  272. .statfs = simple_statfs,
  273. };
  274. /*
  275. * sockfs_dname() is called from d_path().
  276. */
  277. static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
  278. {
  279. return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
  280. dentry->d_inode->i_ino);
  281. }
  282. static const struct dentry_operations sockfs_dentry_operations = {
  283. .d_dname = sockfs_dname,
  284. };
  285. static struct dentry *sockfs_mount(struct file_system_type *fs_type,
  286. int flags, const char *dev_name, void *data)
  287. {
  288. return mount_pseudo(fs_type, "socket:", &sockfs_ops,
  289. &sockfs_dentry_operations, SOCKFS_MAGIC);
  290. }
  291. static struct vfsmount *sock_mnt __read_mostly;
  292. static struct file_system_type sock_fs_type = {
  293. .name = "sockfs",
  294. .mount = sockfs_mount,
  295. .kill_sb = kill_anon_super,
  296. };
  297. /*
  298. * Obtains the first available file descriptor and sets it up for use.
  299. *
  300. * These functions create file structures and maps them to fd space
  301. * of the current process. On success it returns file descriptor
  302. * and file struct implicitly stored in sock->file.
  303. * Note that another thread may close file descriptor before we return
  304. * from this function. We use the fact that now we do not refer
  305. * to socket after mapping. If one day we will need it, this
  306. * function will increment ref. count on file by 1.
  307. *
  308. * In any case returned fd MAY BE not valid!
  309. * This race condition is unavoidable
  310. * with shared fd spaces, we cannot solve it inside kernel,
  311. * but we take care of internal coherence yet.
  312. */
  313. static int sock_alloc_file(struct socket *sock, struct file **f, int flags,
  314. const char *dname)
  315. {
  316. struct qstr name = { .name = "" };
  317. struct path path;
  318. struct file *file;
  319. int fd;
  320. fd = get_unused_fd_flags(flags);
  321. if (unlikely(fd < 0))
  322. return fd;
  323. if (dname) {
  324. name.name = dname;
  325. name.len = strlen(name.name);
  326. } else if (sock->sk) {
  327. name.name = sock->sk->sk_prot_creator->name;
  328. name.len = strlen(name.name);
  329. }
  330. path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
  331. if (unlikely(!path.dentry)) {
  332. put_unused_fd(fd);
  333. return -ENOMEM;
  334. }
  335. path.mnt = mntget(sock_mnt);
  336. d_instantiate(path.dentry, SOCK_INODE(sock));
  337. SOCK_INODE(sock)->i_fop = &socket_file_ops;
  338. file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
  339. &socket_file_ops);
  340. if (unlikely(!file)) {
  341. /* drop dentry, keep inode */
  342. ihold(path.dentry->d_inode);
  343. path_put(&path);
  344. put_unused_fd(fd);
  345. return -ENFILE;
  346. }
  347. sock->file = file;
  348. file->f_flags = O_RDWR | (flags & O_NONBLOCK);
  349. file->f_pos = 0;
  350. file->private_data = sock;
  351. *f = file;
  352. return fd;
  353. }
  354. int sock_map_fd(struct socket *sock, int flags)
  355. {
  356. struct file *newfile;
  357. int fd = sock_alloc_file(sock, &newfile, flags, NULL);
  358. if (likely(fd >= 0))
  359. fd_install(fd, newfile);
  360. return fd;
  361. }
  362. EXPORT_SYMBOL(sock_map_fd);
  363. struct socket *sock_from_file(struct file *file, int *err)
  364. {
  365. if (file->f_op == &socket_file_ops)
  366. return file->private_data; /* set in sock_map_fd */
  367. *err = -ENOTSOCK;
  368. return NULL;
  369. }
  370. EXPORT_SYMBOL(sock_from_file);
  371. /**
  372. * sockfd_lookup - Go from a file number to its socket slot
  373. * @fd: file handle
  374. * @err: pointer to an error code return
  375. *
  376. * The file handle passed in is locked and the socket it is bound
  377. * too is returned. If an error occurs the err pointer is overwritten
  378. * with a negative errno code and NULL is returned. The function checks
  379. * for both invalid handles and passing a handle which is not a socket.
  380. *
  381. * On a success the socket object pointer is returned.
  382. */
  383. struct socket *sockfd_lookup(int fd, int *err)
  384. {
  385. struct file *file;
  386. struct socket *sock;
  387. file = fget(fd);
  388. if (!file) {
  389. *err = -EBADF;
  390. return NULL;
  391. }
  392. sock = sock_from_file(file, err);
  393. if (!sock)
  394. fput(file);
  395. return sock;
  396. }
  397. EXPORT_SYMBOL(sockfd_lookup);
  398. static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
  399. {
  400. struct file *file;
  401. struct socket *sock;
  402. *err = -EBADF;
  403. file = fget_light(fd, fput_needed);
  404. if (file) {
  405. sock = sock_from_file(file, err);
  406. if (sock)
  407. return sock;
  408. fput_light(file, *fput_needed);
  409. }
  410. return NULL;
  411. }
  412. #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
  413. #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
  414. #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
  415. static ssize_t sockfs_getxattr(struct dentry *dentry,
  416. const char *name, void *value, size_t size)
  417. {
  418. const char *proto_name;
  419. size_t proto_size;
  420. int error;
  421. error = -ENODATA;
  422. if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
  423. proto_name = dentry->d_name.name;
  424. proto_size = strlen(proto_name);
  425. if (value) {
  426. error = -ERANGE;
  427. if (proto_size + 1 > size)
  428. goto out;
  429. strncpy(value, proto_name, proto_size + 1);
  430. }
  431. error = proto_size + 1;
  432. }
  433. out:
  434. return error;
  435. }
  436. static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
  437. size_t size)
  438. {
  439. ssize_t len;
  440. ssize_t used = 0;
  441. len = security_inode_listsecurity(dentry->d_inode, buffer, size);
  442. if (len < 0)
  443. return len;
  444. used += len;
  445. if (buffer) {
  446. if (size < used)
  447. return -ERANGE;
  448. buffer += len;
  449. }
  450. len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
  451. used += len;
  452. if (buffer) {
  453. if (size < used)
  454. return -ERANGE;
  455. memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
  456. buffer += len;
  457. }
  458. return used;
  459. }
  460. static const struct inode_operations sockfs_inode_ops = {
  461. .getxattr = sockfs_getxattr,
  462. .listxattr = sockfs_listxattr,
  463. };
  464. /**
  465. * sock_alloc - allocate a socket
  466. *
  467. * Allocate a new inode and socket object. The two are bound together
  468. * and initialised. The socket is then returned. If we are out of inodes
  469. * NULL is returned.
  470. */
  471. static struct socket *sock_alloc(void)
  472. {
  473. struct inode *inode;
  474. struct socket *sock;
  475. inode = new_inode_pseudo(sock_mnt->mnt_sb);
  476. if (!inode)
  477. return NULL;
  478. sock = SOCKET_I(inode);
  479. kmemcheck_annotate_bitfield(sock, type);
  480. inode->i_ino = get_next_ino();
  481. inode->i_mode = S_IFSOCK | S_IRWXUGO;
  482. inode->i_uid = current_fsuid();
  483. inode->i_gid = current_fsgid();
  484. inode->i_op = &sockfs_inode_ops;
  485. this_cpu_add(sockets_in_use, 1);
  486. return sock;
  487. }
  488. /*
  489. * In theory you can't get an open on this inode, but /proc provides
  490. * a back door. Remember to keep it shut otherwise you'll let the
  491. * creepy crawlies in.
  492. */
  493. static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
  494. {
  495. return -ENXIO;
  496. }
  497. const struct file_operations bad_sock_fops = {
  498. .owner = THIS_MODULE,
  499. .open = sock_no_open,
  500. .llseek = noop_llseek,
  501. };
  502. /**
  503. * sock_release - close a socket
  504. * @sock: socket to close
  505. *
  506. * The socket is released from the protocol stack if it has a release
  507. * callback, and the inode is then released if the socket is bound to
  508. * an inode not a file.
  509. */
  510. void sock_release(struct socket *sock)
  511. {
  512. if (sock->ops) {
  513. struct module *owner = sock->ops->owner;
  514. sock->ops->release(sock);
  515. sock->ops = NULL;
  516. module_put(owner);
  517. }
  518. if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
  519. printk(KERN_ERR "sock_release: fasync list not empty!\n");
  520. if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
  521. return;
  522. this_cpu_sub(sockets_in_use, 1);
  523. if (!sock->file) {
  524. iput(SOCK_INODE(sock));
  525. return;
  526. }
  527. sock->file = NULL;
  528. }
  529. EXPORT_SYMBOL(sock_release);
  530. int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
  531. {
  532. *tx_flags = 0;
  533. if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
  534. *tx_flags |= SKBTX_HW_TSTAMP;
  535. if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
  536. *tx_flags |= SKBTX_SW_TSTAMP;
  537. if (sock_flag(sk, SOCK_WIFI_STATUS))
  538. *tx_flags |= SKBTX_WIFI_STATUS;
  539. return 0;
  540. }
  541. EXPORT_SYMBOL(sock_tx_timestamp);
  542. static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
  543. struct msghdr *msg, size_t size)
  544. {
  545. struct sock_iocb *si = kiocb_to_siocb(iocb);
  546. sock_update_classid(sock->sk);
  547. si->sock = sock;
  548. si->scm = NULL;
  549. si->msg = msg;
  550. si->size = size;
  551. return sock->ops->sendmsg(iocb, sock, msg, size);
  552. }
  553. static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
  554. struct msghdr *msg, size_t size)
  555. {
  556. int err = security_socket_sendmsg(sock, msg, size);
  557. return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
  558. }
  559. int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
  560. {
  561. struct kiocb iocb;
  562. struct sock_iocb siocb;
  563. int ret;
  564. init_sync_kiocb(&iocb, NULL);
  565. iocb.private = &siocb;
  566. ret = __sock_sendmsg(&iocb, sock, msg, size);
  567. if (-EIOCBQUEUED == ret)
  568. ret = wait_on_sync_kiocb(&iocb);
  569. return ret;
  570. }
  571. EXPORT_SYMBOL(sock_sendmsg);
  572. static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
  573. {
  574. struct kiocb iocb;
  575. struct sock_iocb siocb;
  576. int ret;
  577. init_sync_kiocb(&iocb, NULL);
  578. iocb.private = &siocb;
  579. ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
  580. if (-EIOCBQUEUED == ret)
  581. ret = wait_on_sync_kiocb(&iocb);
  582. return ret;
  583. }
  584. int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
  585. struct kvec *vec, size_t num, size_t size)
  586. {
  587. mm_segment_t oldfs = get_fs();
  588. int result;
  589. set_fs(KERNEL_DS);
  590. /*
  591. * the following is safe, since for compiler definitions of kvec and
  592. * iovec are identical, yielding the same in-core layout and alignment
  593. */
  594. msg->msg_iov = (struct iovec *)vec;
  595. msg->msg_iovlen = num;
  596. result = sock_sendmsg(sock, msg, size);
  597. set_fs(oldfs);
  598. return result;
  599. }
  600. EXPORT_SYMBOL(kernel_sendmsg);
  601. static int ktime2ts(ktime_t kt, struct timespec *ts)
  602. {
  603. if (kt.tv64) {
  604. *ts = ktime_to_timespec(kt);
  605. return 1;
  606. } else {
  607. return 0;
  608. }
  609. }
  610. /*
  611. * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
  612. */
  613. void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
  614. struct sk_buff *skb)
  615. {
  616. int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
  617. struct timespec ts[3];
  618. int empty = 1;
  619. struct skb_shared_hwtstamps *shhwtstamps =
  620. skb_hwtstamps(skb);
  621. /* Race occurred between timestamp enabling and packet
  622. receiving. Fill in the current time for now. */
  623. if (need_software_tstamp && skb->tstamp.tv64 == 0)
  624. __net_timestamp(skb);
  625. if (need_software_tstamp) {
  626. if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
  627. struct timeval tv;
  628. skb_get_timestamp(skb, &tv);
  629. put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
  630. sizeof(tv), &tv);
  631. } else {
  632. skb_get_timestampns(skb, &ts[0]);
  633. put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
  634. sizeof(ts[0]), &ts[0]);
  635. }
  636. }
  637. memset(ts, 0, sizeof(ts));
  638. if (skb->tstamp.tv64 &&
  639. sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
  640. skb_get_timestampns(skb, ts + 0);
  641. empty = 0;
  642. }
  643. if (shhwtstamps) {
  644. if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
  645. ktime2ts(shhwtstamps->syststamp, ts + 1))
  646. empty = 0;
  647. if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
  648. ktime2ts(shhwtstamps->hwtstamp, ts + 2))
  649. empty = 0;
  650. }
  651. if (!empty)
  652. put_cmsg(msg, SOL_SOCKET,
  653. SCM_TIMESTAMPING, sizeof(ts), &ts);
  654. }
  655. EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
  656. void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
  657. struct sk_buff *skb)
  658. {
  659. int ack;
  660. if (!sock_flag(sk, SOCK_WIFI_STATUS))
  661. return;
  662. if (!skb->wifi_acked_valid)
  663. return;
  664. ack = skb->wifi_acked;
  665. put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
  666. }
  667. EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
  668. static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
  669. struct sk_buff *skb)
  670. {
  671. if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
  672. put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
  673. sizeof(__u32), &skb->dropcount);
  674. }
  675. void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
  676. struct sk_buff *skb)
  677. {
  678. sock_recv_timestamp(msg, sk, skb);
  679. sock_recv_drops(msg, sk, skb);
  680. }
  681. EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
  682. static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
  683. struct msghdr *msg, size_t size, int flags)
  684. {
  685. struct sock_iocb *si = kiocb_to_siocb(iocb);
  686. sock_update_classid(sock->sk);
  687. si->sock = sock;
  688. si->scm = NULL;
  689. si->msg = msg;
  690. si->size = size;
  691. si->flags = flags;
  692. return sock->ops->recvmsg(iocb, sock, msg, size, flags);
  693. }
  694. static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
  695. struct msghdr *msg, size_t size, int flags)
  696. {
  697. int err = security_socket_recvmsg(sock, msg, size, flags);
  698. return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
  699. }
  700. int sock_recvmsg(struct socket *sock, struct msghdr *msg,
  701. size_t size, int flags)
  702. {
  703. struct kiocb iocb;
  704. struct sock_iocb siocb;
  705. int ret;
  706. init_sync_kiocb(&iocb, NULL);
  707. iocb.private = &siocb;
  708. ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
  709. if (-EIOCBQUEUED == ret)
  710. ret = wait_on_sync_kiocb(&iocb);
  711. return ret;
  712. }
  713. EXPORT_SYMBOL(sock_recvmsg);
  714. static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
  715. size_t size, int flags)
  716. {
  717. struct kiocb iocb;
  718. struct sock_iocb siocb;
  719. int ret;
  720. init_sync_kiocb(&iocb, NULL);
  721. iocb.private = &siocb;
  722. ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
  723. if (-EIOCBQUEUED == ret)
  724. ret = wait_on_sync_kiocb(&iocb);
  725. return ret;
  726. }
  727. /**
  728. * kernel_recvmsg - Receive a message from a socket (kernel space)
  729. * @sock: The socket to receive the message from
  730. * @msg: Received message
  731. * @vec: Input s/g array for message data
  732. * @num: Size of input s/g array
  733. * @size: Number of bytes to read
  734. * @flags: Message flags (MSG_DONTWAIT, etc...)
  735. *
  736. * On return the msg structure contains the scatter/gather array passed in the
  737. * vec argument. The array is modified so that it consists of the unfilled
  738. * portion of the original array.
  739. *
  740. * The returned value is the total number of bytes received, or an error.
  741. */
  742. int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
  743. struct kvec *vec, size_t num, size_t size, int flags)
  744. {
  745. mm_segment_t oldfs = get_fs();
  746. int result;
  747. set_fs(KERNEL_DS);
  748. /*
  749. * the following is safe, since for compiler definitions of kvec and
  750. * iovec are identical, yielding the same in-core layout and alignment
  751. */
  752. msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
  753. result = sock_recvmsg(sock, msg, size, flags);
  754. set_fs(oldfs);
  755. return result;
  756. }
  757. EXPORT_SYMBOL(kernel_recvmsg);
  758. static void sock_aio_dtor(struct kiocb *iocb)
  759. {
  760. kfree(iocb->private);
  761. }
  762. static ssize_t sock_sendpage(struct file *file, struct page *page,
  763. int offset, size_t size, loff_t *ppos, int more)
  764. {
  765. struct socket *sock;
  766. int flags;
  767. sock = file->private_data;
  768. flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
  769. /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
  770. flags |= more;
  771. return kernel_sendpage(sock, page, offset, size, flags);
  772. }
  773. static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
  774. struct pipe_inode_info *pipe, size_t len,
  775. unsigned int flags)
  776. {
  777. struct socket *sock = file->private_data;
  778. if (unlikely(!sock->ops->splice_read))
  779. return -EINVAL;
  780. sock_update_classid(sock->sk);
  781. return sock->ops->splice_read(sock, ppos, pipe, len, flags);
  782. }
  783. static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
  784. struct sock_iocb *siocb)
  785. {
  786. if (!is_sync_kiocb(iocb)) {
  787. siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
  788. if (!siocb)
  789. return NULL;
  790. iocb->ki_dtor = sock_aio_dtor;
  791. }
  792. siocb->kiocb = iocb;
  793. iocb->private = siocb;
  794. return siocb;
  795. }
  796. static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
  797. struct file *file, const struct iovec *iov,
  798. unsigned long nr_segs)
  799. {
  800. struct socket *sock = file->private_data;
  801. size_t size = 0;
  802. int i;
  803. for (i = 0; i < nr_segs; i++)
  804. size += iov[i].iov_len;
  805. msg->msg_name = NULL;
  806. msg->msg_namelen = 0;
  807. msg->msg_control = NULL;
  808. msg->msg_controllen = 0;
  809. msg->msg_iov = (struct iovec *)iov;
  810. msg->msg_iovlen = nr_segs;
  811. msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
  812. return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
  813. }
  814. static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
  815. unsigned long nr_segs, loff_t pos)
  816. {
  817. struct sock_iocb siocb, *x;
  818. if (pos != 0)
  819. return -ESPIPE;
  820. if (iocb->ki_left == 0) /* Match SYS5 behaviour */
  821. return 0;
  822. x = alloc_sock_iocb(iocb, &siocb);
  823. if (!x)
  824. return -ENOMEM;
  825. return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
  826. }
  827. static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
  828. struct file *file, const struct iovec *iov,
  829. unsigned long nr_segs)
  830. {
  831. struct socket *sock = file->private_data;
  832. size_t size = 0;
  833. int i;
  834. for (i = 0; i < nr_segs; i++)
  835. size += iov[i].iov_len;
  836. msg->msg_name = NULL;
  837. msg->msg_namelen = 0;
  838. msg->msg_control = NULL;
  839. msg->msg_controllen = 0;
  840. msg->msg_iov = (struct iovec *)iov;
  841. msg->msg_iovlen = nr_segs;
  842. msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
  843. if (sock->type == SOCK_SEQPACKET)
  844. msg->msg_flags |= MSG_EOR;
  845. return __sock_sendmsg(iocb, sock, msg, size);
  846. }
  847. static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
  848. unsigned long nr_segs, loff_t pos)
  849. {
  850. struct sock_iocb siocb, *x;
  851. if (pos != 0)
  852. return -ESPIPE;
  853. x = alloc_sock_iocb(iocb, &siocb);
  854. if (!x)
  855. return -ENOMEM;
  856. return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
  857. }
  858. /*
  859. * Atomic setting of ioctl hooks to avoid race
  860. * with module unload.
  861. */
  862. static DEFINE_MUTEX(br_ioctl_mutex);
  863. static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
  864. void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
  865. {
  866. mutex_lock(&br_ioctl_mutex);
  867. br_ioctl_hook = hook;
  868. mutex_unlock(&br_ioctl_mutex);
  869. }
  870. EXPORT_SYMBOL(brioctl_set);
  871. static DEFINE_MUTEX(vlan_ioctl_mutex);
  872. static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
  873. void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
  874. {
  875. mutex_lock(&vlan_ioctl_mutex);
  876. vlan_ioctl_hook = hook;
  877. mutex_unlock(&vlan_ioctl_mutex);
  878. }
  879. EXPORT_SYMBOL(vlan_ioctl_set);
  880. static DEFINE_MUTEX(dlci_ioctl_mutex);
  881. static int (*dlci_ioctl_hook) (unsigned int, void __user *);
  882. void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
  883. {
  884. mutex_lock(&dlci_ioctl_mutex);
  885. dlci_ioctl_hook = hook;
  886. mutex_unlock(&dlci_ioctl_mutex);
  887. }
  888. EXPORT_SYMBOL(dlci_ioctl_set);
  889. static long sock_do_ioctl(struct net *net, struct socket *sock,
  890. unsigned int cmd, unsigned long arg)
  891. {
  892. int err;
  893. void __user *argp = (void __user *)arg;
  894. err = sock->ops->ioctl(sock, cmd, arg);
  895. /*
  896. * If this ioctl is unknown try to hand it down
  897. * to the NIC driver.
  898. */
  899. if (err == -ENOIOCTLCMD)
  900. err = dev_ioctl(net, cmd, argp);
  901. return err;
  902. }
  903. /*
  904. * With an ioctl, arg may well be a user mode pointer, but we don't know
  905. * what to do with it - that's up to the protocol still.
  906. */
  907. static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
  908. {
  909. struct socket *sock;
  910. struct sock *sk;
  911. void __user *argp = (void __user *)arg;
  912. int pid, err;
  913. struct net *net;
  914. sock = file->private_data;
  915. sk = sock->sk;
  916. net = sock_net(sk);
  917. if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
  918. err = dev_ioctl(net, cmd, argp);
  919. } else
  920. #ifdef CONFIG_WEXT_CORE
  921. if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
  922. err = dev_ioctl(net, cmd, argp);
  923. } else
  924. #endif
  925. switch (cmd) {
  926. case FIOSETOWN:
  927. case SIOCSPGRP:
  928. err = -EFAULT;
  929. if (get_user(pid, (int __user *)argp))
  930. break;
  931. err = f_setown(sock->file, pid, 1);
  932. break;
  933. case FIOGETOWN:
  934. case SIOCGPGRP:
  935. err = put_user(f_getown(sock->file),
  936. (int __user *)argp);
  937. break;
  938. case SIOCGIFBR:
  939. case SIOCSIFBR:
  940. case SIOCBRADDBR:
  941. case SIOCBRDELBR:
  942. err = -ENOPKG;
  943. if (!br_ioctl_hook)
  944. request_module("bridge");
  945. mutex_lock(&br_ioctl_mutex);
  946. if (br_ioctl_hook)
  947. err = br_ioctl_hook(net, cmd, argp);
  948. mutex_unlock(&br_ioctl_mutex);
  949. break;
  950. case SIOCGIFVLAN:
  951. case SIOCSIFVLAN:
  952. err = -ENOPKG;
  953. if (!vlan_ioctl_hook)
  954. request_module("8021q");
  955. mutex_lock(&vlan_ioctl_mutex);
  956. if (vlan_ioctl_hook)
  957. err = vlan_ioctl_hook(net, argp);
  958. mutex_unlock(&vlan_ioctl_mutex);
  959. break;
  960. case SIOCADDDLCI:
  961. case SIOCDELDLCI:
  962. err = -ENOPKG;
  963. if (!dlci_ioctl_hook)
  964. request_module("dlci");
  965. mutex_lock(&dlci_ioctl_mutex);
  966. if (dlci_ioctl_hook)
  967. err = dlci_ioctl_hook(cmd, argp);
  968. mutex_unlock(&dlci_ioctl_mutex);
  969. break;
  970. default:
  971. err = sock_do_ioctl(net, sock, cmd, arg);
  972. break;
  973. }
  974. return err;
  975. }
  976. int sock_create_lite(int family, int type, int protocol, struct socket **res)
  977. {
  978. int err;
  979. struct socket *sock = NULL;
  980. err = security_socket_create(family, type, protocol, 1);
  981. if (err)
  982. goto out;
  983. sock = sock_alloc();
  984. if (!sock) {
  985. err = -ENOMEM;
  986. goto out;
  987. }
  988. sock->type = type;
  989. err = security_socket_post_create(sock, family, type, protocol, 1);
  990. if (err)
  991. goto out_release;
  992. out:
  993. *res = sock;
  994. return err;
  995. out_release:
  996. sock_release(sock);
  997. sock = NULL;
  998. goto out;
  999. }
  1000. EXPORT_SYMBOL(sock_create_lite);
  1001. /* No kernel lock held - perfect */
  1002. static unsigned int sock_poll(struct file *file, poll_table *wait)
  1003. {
  1004. struct socket *sock;
  1005. /*
  1006. * We can't return errors to poll, so it's either yes or no.
  1007. */
  1008. sock = file->private_data;
  1009. return sock->ops->poll(file, sock, wait);
  1010. }
  1011. static int sock_mmap(struct file *file, struct vm_area_struct *vma)
  1012. {
  1013. struct socket *sock = file->private_data;
  1014. return sock->ops->mmap(file, sock, vma);
  1015. }
  1016. static int sock_close(struct inode *inode, struct file *filp)
  1017. {
  1018. /*
  1019. * It was possible the inode is NULL we were
  1020. * closing an unfinished socket.
  1021. */
  1022. if (!inode) {
  1023. printk(KERN_DEBUG "sock_close: NULL inode\n");
  1024. return 0;
  1025. }
  1026. sock_release(SOCKET_I(inode));
  1027. return 0;
  1028. }
  1029. /*
  1030. * Update the socket async list
  1031. *
  1032. * Fasync_list locking strategy.
  1033. *
  1034. * 1. fasync_list is modified only under process context socket lock
  1035. * i.e. under semaphore.
  1036. * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
  1037. * or under socket lock
  1038. */
  1039. static int sock_fasync(int fd, struct file *filp, int on)
  1040. {
  1041. struct socket *sock = filp->private_data;
  1042. struct sock *sk = sock->sk;
  1043. struct socket_wq *wq;
  1044. if (sk == NULL)
  1045. return -EINVAL;
  1046. lock_sock(sk);
  1047. wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
  1048. fasync_helper(fd, filp, on, &wq->fasync_list);
  1049. if (!wq->fasync_list)
  1050. sock_reset_flag(sk, SOCK_FASYNC);
  1051. else
  1052. sock_set_flag(sk, SOCK_FASYNC);
  1053. release_sock(sk);
  1054. return 0;
  1055. }
  1056. /* This function may be called only under socket lock or callback_lock or rcu_lock */
  1057. int sock_wake_async(struct socket *sock, int how, int band)
  1058. {
  1059. struct socket_wq *wq;
  1060. if (!sock)
  1061. return -1;
  1062. rcu_read_lock();
  1063. wq = rcu_dereference(sock->wq);
  1064. if (!wq || !wq->fasync_list) {
  1065. rcu_read_unlock();
  1066. return -1;
  1067. }
  1068. switch (how) {
  1069. case SOCK_WAKE_WAITD:
  1070. if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
  1071. break;
  1072. goto call_kill;
  1073. case SOCK_WAKE_SPACE:
  1074. if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
  1075. break;
  1076. /* fall through */
  1077. case SOCK_WAKE_IO:
  1078. call_kill:
  1079. kill_fasync(&wq->fasync_list, SIGIO, band);
  1080. break;
  1081. case SOCK_WAKE_URG:
  1082. kill_fasync(&wq->fasync_list, SIGURG, band);
  1083. }
  1084. rcu_read_unlock();
  1085. return 0;
  1086. }
  1087. EXPORT_SYMBOL(sock_wake_async);
  1088. int __sock_create(struct net *net, int family, int type, int protocol,
  1089. struct socket **res, int kern)
  1090. {
  1091. int err;
  1092. struct socket *sock;
  1093. const struct net_proto_family *pf;
  1094. /*
  1095. * Check protocol is in range
  1096. */
  1097. if (family < 0 || family >= NPROTO)
  1098. return -EAFNOSUPPORT;
  1099. if (type < 0 || type >= SOCK_MAX)
  1100. return -EINVAL;
  1101. /* Compatibility.
  1102. This uglymoron is moved from INET layer to here to avoid
  1103. deadlock in module load.
  1104. */
  1105. if (family == PF_INET && type == SOCK_PACKET) {
  1106. static int warned;
  1107. if (!warned) {
  1108. warned = 1;
  1109. printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
  1110. current->comm);
  1111. }
  1112. family = PF_PACKET;
  1113. }
  1114. err = security_socket_create(family, type, protocol, kern);
  1115. if (err)
  1116. return err;
  1117. /*
  1118. * Allocate the socket and allow the family to set things up. if
  1119. * the protocol is 0, the family is instructed to select an appropriate
  1120. * default.
  1121. */
  1122. sock = sock_alloc();
  1123. if (!sock) {
  1124. net_warn_ratelimited("socket: no more sockets\n");
  1125. return -ENFILE; /* Not exactly a match, but its the
  1126. closest posix thing */
  1127. }
  1128. sock->type = type;
  1129. #ifdef CONFIG_MODULES
  1130. /* Attempt to load a protocol module if the find failed.
  1131. *
  1132. * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
  1133. * requested real, full-featured networking support upon configuration.
  1134. * Otherwise module support will break!
  1135. */
  1136. if (rcu_access_pointer(net_families[family]) == NULL)
  1137. request_module("net-pf-%d", family);
  1138. #endif
  1139. rcu_read_lock();
  1140. pf = rcu_dereference(net_families[family]);
  1141. err = -EAFNOSUPPORT;
  1142. if (!pf)
  1143. goto out_release;
  1144. /*
  1145. * We will call the ->create function, that possibly is in a loadable
  1146. * module, so we have to bump that loadable module refcnt first.
  1147. */
  1148. if (!try_module_get(pf->owner))
  1149. goto out_release;
  1150. /* Now protected by module ref count */
  1151. rcu_read_unlock();
  1152. err = pf->create(net, sock, protocol, kern);
  1153. if (err < 0)
  1154. goto out_module_put;
  1155. /*
  1156. * Now to bump the refcnt of the [loadable] module that owns this
  1157. * socket at sock_release time we decrement its refcnt.
  1158. */
  1159. if (!try_module_get(sock->ops->owner))
  1160. goto out_module_busy;
  1161. /*
  1162. * Now that we're done with the ->create function, the [loadable]
  1163. * module can have its refcnt decremented
  1164. */
  1165. module_put(pf->owner);
  1166. err = security_socket_post_create(sock, family, type, protocol, kern);
  1167. if (err)
  1168. goto out_sock_release;
  1169. *res = sock;
  1170. return 0;
  1171. out_module_busy:
  1172. err = -EAFNOSUPPORT;
  1173. out_module_put:
  1174. sock->ops = NULL;
  1175. module_put(pf->owner);
  1176. out_sock_release:
  1177. sock_release(sock);
  1178. return err;
  1179. out_release:
  1180. rcu_read_unlock();
  1181. goto out_sock_release;
  1182. }
  1183. EXPORT_SYMBOL(__sock_create);
  1184. int sock_create(int family, int type, int protocol, struct socket **res)
  1185. {
  1186. return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
  1187. }
  1188. EXPORT_SYMBOL(sock_create);
  1189. int sock_create_kern(int family, int type, int protocol, struct socket **res)
  1190. {
  1191. return __sock_create(&init_net, family, type, protocol, res, 1);
  1192. }
  1193. EXPORT_SYMBOL(sock_create_kern);
  1194. SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
  1195. {
  1196. int retval;
  1197. struct socket *sock;
  1198. int flags;
  1199. /* Check the SOCK_* constants for consistency. */
  1200. BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
  1201. BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
  1202. BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
  1203. BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
  1204. flags = type & ~SOCK_TYPE_MASK;
  1205. if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
  1206. return -EINVAL;
  1207. type &= SOCK_TYPE_MASK;
  1208. if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
  1209. flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
  1210. retval = sock_create(family, type, protocol, &sock);
  1211. if (retval < 0)
  1212. goto out;
  1213. retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
  1214. if (retval < 0)
  1215. goto out_release;
  1216. out:
  1217. /* It may be already another descriptor 8) Not kernel problem. */
  1218. return retval;
  1219. out_release:
  1220. sock_release(sock);
  1221. return retval;
  1222. }
  1223. /*
  1224. * Create a pair of connected sockets.
  1225. */
  1226. SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
  1227. int __user *, usockvec)
  1228. {
  1229. struct socket *sock1, *sock2;
  1230. int fd1, fd2, err;
  1231. struct file *newfile1, *newfile2;
  1232. int flags;
  1233. flags = type & ~SOCK_TYPE_MASK;
  1234. if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
  1235. return -EINVAL;
  1236. type &= SOCK_TYPE_MASK;
  1237. if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
  1238. flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
  1239. /*
  1240. * Obtain the first socket and check if the underlying protocol
  1241. * supports the socketpair call.
  1242. */
  1243. err = sock_create(family, type, protocol, &sock1);
  1244. if (err < 0)
  1245. goto out;
  1246. err = sock_create(family, type, protocol, &sock2);
  1247. if (err < 0)
  1248. goto out_release_1;
  1249. err = sock1->ops->socketpair(sock1, sock2);
  1250. if (err < 0)
  1251. goto out_release_both;
  1252. fd1 = sock_alloc_file(sock1, &newfile1, flags, NULL);
  1253. if (unlikely(fd1 < 0)) {
  1254. err = fd1;
  1255. goto out_release_both;
  1256. }
  1257. fd2 = sock_alloc_file(sock2, &newfile2, flags, NULL);
  1258. if (unlikely(fd2 < 0)) {
  1259. err = fd2;
  1260. fput(newfile1);
  1261. put_unused_fd(fd1);
  1262. sock_release(sock2);
  1263. goto out;
  1264. }
  1265. audit_fd_pair(fd1, fd2);
  1266. fd_install(fd1, newfile1);
  1267. fd_install(fd2, newfile2);
  1268. /* fd1 and fd2 may be already another descriptors.
  1269. * Not kernel problem.
  1270. */
  1271. err = put_user(fd1, &usockvec[0]);
  1272. if (!err)
  1273. err = put_user(fd2, &usockvec[1]);
  1274. if (!err)
  1275. return 0;
  1276. sys_close(fd2);
  1277. sys_close(fd1);
  1278. return err;
  1279. out_release_both:
  1280. sock_release(sock2);
  1281. out_release_1:
  1282. sock_release(sock1);
  1283. out:
  1284. return err;
  1285. }
  1286. /*
  1287. * Bind a name to a socket. Nothing much to do here since it's
  1288. * the protocol's responsibility to handle the local address.
  1289. *
  1290. * We move the socket address to kernel space before we call
  1291. * the protocol layer (having also checked the address is ok).
  1292. */
  1293. SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
  1294. {
  1295. struct socket *sock;
  1296. struct sockaddr_storage address;
  1297. int err, fput_needed;
  1298. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1299. if (sock) {
  1300. err = move_addr_to_kernel(umyaddr, addrlen, &address);
  1301. if (err >= 0) {
  1302. err = security_socket_bind(sock,
  1303. (struct sockaddr *)&address,
  1304. addrlen);
  1305. if (!err)
  1306. err = sock->ops->bind(sock,
  1307. (struct sockaddr *)
  1308. &address, addrlen);
  1309. }
  1310. fput_light(sock->file, fput_needed);
  1311. }
  1312. return err;
  1313. }
  1314. /*
  1315. * Perform a listen. Basically, we allow the protocol to do anything
  1316. * necessary for a listen, and if that works, we mark the socket as
  1317. * ready for listening.
  1318. */
  1319. SYSCALL_DEFINE2(listen, int, fd, int, backlog)
  1320. {
  1321. struct socket *sock;
  1322. int err, fput_needed;
  1323. int somaxconn;
  1324. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1325. if (sock) {
  1326. somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
  1327. if ((unsigned int)backlog > somaxconn)
  1328. backlog = somaxconn;
  1329. err = security_socket_listen(sock, backlog);
  1330. if (!err)
  1331. err = sock->ops->listen(sock, backlog);
  1332. fput_light(sock->file, fput_needed);
  1333. }
  1334. return err;
  1335. }
  1336. /*
  1337. * For accept, we attempt to create a new socket, set up the link
  1338. * with the client, wake up the client, then return the new
  1339. * connected fd. We collect the address of the connector in kernel
  1340. * space and move it to user at the very end. This is unclean because
  1341. * we open the socket then return an error.
  1342. *
  1343. * 1003.1g adds the ability to recvmsg() to query connection pending
  1344. * status to recvmsg. We need to add that support in a way thats
  1345. * clean when we restucture accept also.
  1346. */
  1347. SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
  1348. int __user *, upeer_addrlen, int, flags)
  1349. {
  1350. struct socket *sock, *newsock;
  1351. struct file *newfile;
  1352. int err, len, newfd, fput_needed;
  1353. struct sockaddr_storage address;
  1354. if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
  1355. return -EINVAL;
  1356. if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
  1357. flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
  1358. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1359. if (!sock)
  1360. goto out;
  1361. err = -ENFILE;
  1362. newsock = sock_alloc();
  1363. if (!newsock)
  1364. goto out_put;
  1365. newsock->type = sock->type;
  1366. newsock->ops = sock->ops;
  1367. /*
  1368. * We don't need try_module_get here, as the listening socket (sock)
  1369. * has the protocol module (sock->ops->owner) held.
  1370. */
  1371. __module_get(newsock->ops->owner);
  1372. newfd = sock_alloc_file(newsock, &newfile, flags,
  1373. sock->sk->sk_prot_creator->name);
  1374. if (unlikely(newfd < 0)) {
  1375. err = newfd;
  1376. sock_release(newsock);
  1377. goto out_put;
  1378. }
  1379. err = security_socket_accept(sock, newsock);
  1380. if (err)
  1381. goto out_fd;
  1382. err = sock->ops->accept(sock, newsock, sock->file->f_flags);
  1383. if (err < 0)
  1384. goto out_fd;
  1385. if (upeer_sockaddr) {
  1386. if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
  1387. &len, 2) < 0) {
  1388. err = -ECONNABORTED;
  1389. goto out_fd;
  1390. }
  1391. err = move_addr_to_user(&address,
  1392. len, upeer_sockaddr, upeer_addrlen);
  1393. if (err < 0)
  1394. goto out_fd;
  1395. }
  1396. /* File flags are not inherited via accept() unlike another OSes. */
  1397. fd_install(newfd, newfile);
  1398. err = newfd;
  1399. out_put:
  1400. fput_light(sock->file, fput_needed);
  1401. out:
  1402. return err;
  1403. out_fd:
  1404. fput(newfile);
  1405. put_unused_fd(newfd);
  1406. goto out_put;
  1407. }
  1408. SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
  1409. int __user *, upeer_addrlen)
  1410. {
  1411. return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
  1412. }
  1413. /*
  1414. * Attempt to connect to a socket with the server address. The address
  1415. * is in user space so we verify it is OK and move it to kernel space.
  1416. *
  1417. * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
  1418. * break bindings
  1419. *
  1420. * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
  1421. * other SEQPACKET protocols that take time to connect() as it doesn't
  1422. * include the -EINPROGRESS status for such sockets.
  1423. */
  1424. SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
  1425. int, addrlen)
  1426. {
  1427. struct socket *sock;
  1428. struct sockaddr_storage address;
  1429. int err, fput_needed;
  1430. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1431. if (!sock)
  1432. goto out;
  1433. err = move_addr_to_kernel(uservaddr, addrlen, &address);
  1434. if (err < 0)
  1435. goto out_put;
  1436. err =
  1437. security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
  1438. if (err)
  1439. goto out_put;
  1440. err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
  1441. sock->file->f_flags);
  1442. out_put:
  1443. fput_light(sock->file, fput_needed);
  1444. out:
  1445. return err;
  1446. }
  1447. /*
  1448. * Get the local address ('name') of a socket object. Move the obtained
  1449. * name to user space.
  1450. */
  1451. SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
  1452. int __user *, usockaddr_len)
  1453. {
  1454. struct socket *sock;
  1455. struct sockaddr_storage address;
  1456. int len, err, fput_needed;
  1457. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1458. if (!sock)
  1459. goto out;
  1460. err = security_socket_getsockname(sock);
  1461. if (err)
  1462. goto out_put;
  1463. err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
  1464. if (err)
  1465. goto out_put;
  1466. err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
  1467. out_put:
  1468. fput_light(sock->file, fput_needed);
  1469. out:
  1470. return err;
  1471. }
  1472. /*
  1473. * Get the remote address ('name') of a socket object. Move the obtained
  1474. * name to user space.
  1475. */
  1476. SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
  1477. int __user *, usockaddr_len)
  1478. {
  1479. struct socket *sock;
  1480. struct sockaddr_storage address;
  1481. int len, err, fput_needed;
  1482. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1483. if (sock != NULL) {
  1484. err = security_socket_getpeername(sock);
  1485. if (err) {
  1486. fput_light(sock->file, fput_needed);
  1487. return err;
  1488. }
  1489. err =
  1490. sock->ops->getname(sock, (struct sockaddr *)&address, &len,
  1491. 1);
  1492. if (!err)
  1493. err = move_addr_to_user(&address, len, usockaddr,
  1494. usockaddr_len);
  1495. fput_light(sock->file, fput_needed);
  1496. }
  1497. return err;
  1498. }
  1499. /*
  1500. * Send a datagram to a given address. We move the address into kernel
  1501. * space and check the user space data area is readable before invoking
  1502. * the protocol.
  1503. */
  1504. SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
  1505. unsigned int, flags, struct sockaddr __user *, addr,
  1506. int, addr_len)
  1507. {
  1508. struct socket *sock;
  1509. struct sockaddr_storage address;
  1510. int err;
  1511. struct msghdr msg;
  1512. struct iovec iov;
  1513. int fput_needed;
  1514. if (len > INT_MAX)
  1515. len = INT_MAX;
  1516. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1517. if (!sock)
  1518. goto out;
  1519. iov.iov_base = buff;
  1520. iov.iov_len = len;
  1521. msg.msg_name = NULL;
  1522. msg.msg_iov = &iov;
  1523. msg.msg_iovlen = 1;
  1524. msg.msg_control = NULL;
  1525. msg.msg_controllen = 0;
  1526. msg.msg_namelen = 0;
  1527. if (addr) {
  1528. err = move_addr_to_kernel(addr, addr_len, &address);
  1529. if (err < 0)
  1530. goto out_put;
  1531. msg.msg_name = (struct sockaddr *)&address;
  1532. msg.msg_namelen = addr_len;
  1533. }
  1534. if (sock->file->f_flags & O_NONBLOCK)
  1535. flags |= MSG_DONTWAIT;
  1536. msg.msg_flags = flags;
  1537. err = sock_sendmsg(sock, &msg, len);
  1538. out_put:
  1539. fput_light(sock->file, fput_needed);
  1540. out:
  1541. return err;
  1542. }
  1543. /*
  1544. * Send a datagram down a socket.
  1545. */
  1546. SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
  1547. unsigned int, flags)
  1548. {
  1549. return sys_sendto(fd, buff, len, flags, NULL, 0);
  1550. }
  1551. /*
  1552. * Receive a frame from the socket and optionally record the address of the
  1553. * sender. We verify the buffers are writable and if needed move the
  1554. * sender address from kernel to user space.
  1555. */
  1556. SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
  1557. unsigned int, flags, struct sockaddr __user *, addr,
  1558. int __user *, addr_len)
  1559. {
  1560. struct socket *sock;
  1561. struct iovec iov;
  1562. struct msghdr msg;
  1563. struct sockaddr_storage address;
  1564. int err, err2;
  1565. int fput_needed;
  1566. if (size > INT_MAX)
  1567. size = INT_MAX;
  1568. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1569. if (!sock)
  1570. goto out;
  1571. msg.msg_control = NULL;
  1572. msg.msg_controllen = 0;
  1573. msg.msg_iovlen = 1;
  1574. msg.msg_iov = &iov;
  1575. iov.iov_len = size;
  1576. iov.iov_base = ubuf;
  1577. msg.msg_name = (struct sockaddr *)&address;
  1578. msg.msg_namelen = sizeof(address);
  1579. if (sock->file->f_flags & O_NONBLOCK)
  1580. flags |= MSG_DONTWAIT;
  1581. err = sock_recvmsg(sock, &msg, size, flags);
  1582. if (err >= 0 && addr != NULL) {
  1583. err2 = move_addr_to_user(&address,
  1584. msg.msg_namelen, addr, addr_len);
  1585. if (err2 < 0)
  1586. err = err2;
  1587. }
  1588. fput_light(sock->file, fput_needed);
  1589. out:
  1590. return err;
  1591. }
  1592. /*
  1593. * Receive a datagram from a socket.
  1594. */
  1595. asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
  1596. unsigned int flags)
  1597. {
  1598. return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
  1599. }
  1600. /*
  1601. * Set a socket option. Because we don't know the option lengths we have
  1602. * to pass the user mode parameter for the protocols to sort out.
  1603. */
  1604. SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
  1605. char __user *, optval, int, optlen)
  1606. {
  1607. int err, fput_needed;
  1608. struct socket *sock;
  1609. if (optlen < 0)
  1610. return -EINVAL;
  1611. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1612. if (sock != NULL) {
  1613. err = security_socket_setsockopt(sock, level, optname);
  1614. if (err)
  1615. goto out_put;
  1616. if (level == SOL_SOCKET)
  1617. err =
  1618. sock_setsockopt(sock, level, optname, optval,
  1619. optlen);
  1620. else
  1621. err =
  1622. sock->ops->setsockopt(sock, level, optname, optval,
  1623. optlen);
  1624. out_put:
  1625. fput_light(sock->file, fput_needed);
  1626. }
  1627. return err;
  1628. }
  1629. /*
  1630. * Get a socket option. Because we don't know the option lengths we have
  1631. * to pass a user mode parameter for the protocols to sort out.
  1632. */
  1633. SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
  1634. char __user *, optval, int __user *, optlen)
  1635. {
  1636. int err, fput_needed;
  1637. struct socket *sock;
  1638. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1639. if (sock != NULL) {
  1640. err = security_socket_getsockopt(sock, level, optname);
  1641. if (err)
  1642. goto out_put;
  1643. if (level == SOL_SOCKET)
  1644. err =
  1645. sock_getsockopt(sock, level, optname, optval,
  1646. optlen);
  1647. else
  1648. err =
  1649. sock->ops->getsockopt(sock, level, optname, optval,
  1650. optlen);
  1651. out_put:
  1652. fput_light(sock->file, fput_needed);
  1653. }
  1654. return err;
  1655. }
  1656. /*
  1657. * Shutdown a socket.
  1658. */
  1659. SYSCALL_DEFINE2(shutdown, int, fd, int, how)
  1660. {
  1661. int err, fput_needed;
  1662. struct socket *sock;
  1663. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1664. if (sock != NULL) {
  1665. err = security_socket_shutdown(sock, how);
  1666. if (!err)
  1667. err = sock->ops->shutdown(sock, how);
  1668. fput_light(sock->file, fput_needed);
  1669. }
  1670. return err;
  1671. }
  1672. /* A couple of helpful macros for getting the address of the 32/64 bit
  1673. * fields which are the same type (int / unsigned) on our platforms.
  1674. */
  1675. #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
  1676. #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
  1677. #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
  1678. struct used_address {
  1679. struct sockaddr_storage name;
  1680. unsigned int name_len;
  1681. };
  1682. static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
  1683. struct msghdr *msg_sys, unsigned int flags,
  1684. struct used_address *used_address)
  1685. {
  1686. struct compat_msghdr __user *msg_compat =
  1687. (struct compat_msghdr __user *)msg;
  1688. struct sockaddr_storage address;
  1689. struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
  1690. unsigned char ctl[sizeof(struct cmsghdr) + 20]
  1691. __attribute__ ((aligned(sizeof(__kernel_size_t))));
  1692. /* 20 is size of ipv6_pktinfo */
  1693. unsigned char *ctl_buf = ctl;
  1694. int err, ctl_len, total_len;
  1695. err = -EFAULT;
  1696. if (MSG_CMSG_COMPAT & flags) {
  1697. if (get_compat_msghdr(msg_sys, msg_compat))
  1698. return -EFAULT;
  1699. } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
  1700. return -EFAULT;
  1701. if (msg_sys->msg_iovlen > UIO_FASTIOV) {
  1702. err = -EMSGSIZE;
  1703. if (msg_sys->msg_iovlen > UIO_MAXIOV)
  1704. goto out;
  1705. err = -ENOMEM;
  1706. iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
  1707. GFP_KERNEL);
  1708. if (!iov)
  1709. goto out;
  1710. }
  1711. /* This will also move the address data into kernel space */
  1712. if (MSG_CMSG_COMPAT & flags) {
  1713. err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
  1714. } else
  1715. err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
  1716. if (err < 0)
  1717. goto out_freeiov;
  1718. total_len = err;
  1719. err = -ENOBUFS;
  1720. if (msg_sys->msg_controllen > INT_MAX)
  1721. goto out_freeiov;
  1722. ctl_len = msg_sys->msg_controllen;
  1723. if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
  1724. err =
  1725. cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
  1726. sizeof(ctl));
  1727. if (err)
  1728. goto out_freeiov;
  1729. ctl_buf = msg_sys->msg_control;
  1730. ctl_len = msg_sys->msg_controllen;
  1731. } else if (ctl_len) {
  1732. if (ctl_len > sizeof(ctl)) {
  1733. ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
  1734. if (ctl_buf == NULL)
  1735. goto out_freeiov;
  1736. }
  1737. err = -EFAULT;
  1738. /*
  1739. * Careful! Before this, msg_sys->msg_control contains a user pointer.
  1740. * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
  1741. * checking falls down on this.
  1742. */
  1743. if (copy_from_user(ctl_buf,
  1744. (void __user __force *)msg_sys->msg_control,
  1745. ctl_len))
  1746. goto out_freectl;
  1747. msg_sys->msg_control = ctl_buf;
  1748. }
  1749. msg_sys->msg_flags = flags;
  1750. if (sock->file->f_flags & O_NONBLOCK)
  1751. msg_sys->msg_flags |= MSG_DONTWAIT;
  1752. /*
  1753. * If this is sendmmsg() and current destination address is same as
  1754. * previously succeeded address, omit asking LSM's decision.
  1755. * used_address->name_len is initialized to UINT_MAX so that the first
  1756. * destination address never matches.
  1757. */
  1758. if (used_address && msg_sys->msg_name &&
  1759. used_address->name_len == msg_sys->msg_namelen &&
  1760. !memcmp(&used_address->name, msg_sys->msg_name,
  1761. used_address->name_len)) {
  1762. err = sock_sendmsg_nosec(sock, msg_sys, total_len);
  1763. goto out_freectl;
  1764. }
  1765. err = sock_sendmsg(sock, msg_sys, total_len);
  1766. /*
  1767. * If this is sendmmsg() and sending to current destination address was
  1768. * successful, remember it.
  1769. */
  1770. if (used_address && err >= 0) {
  1771. used_address->name_len = msg_sys->msg_namelen;
  1772. if (msg_sys->msg_name)
  1773. memcpy(&used_address->name, msg_sys->msg_name,
  1774. used_address->name_len);
  1775. }
  1776. out_freectl:
  1777. if (ctl_buf != ctl)
  1778. sock_kfree_s(sock->sk, ctl_buf, ctl_len);
  1779. out_freeiov:
  1780. if (iov != iovstack)
  1781. kfree(iov);
  1782. out:
  1783. return err;
  1784. }
  1785. /*
  1786. * BSD sendmsg interface
  1787. */
  1788. SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
  1789. {
  1790. int fput_needed, err;
  1791. struct msghdr msg_sys;
  1792. struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1793. if (!sock)
  1794. goto out;
  1795. err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
  1796. fput_light(sock->file, fput_needed);
  1797. out:
  1798. return err;
  1799. }
  1800. /*
  1801. * Linux sendmmsg interface
  1802. */
  1803. int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
  1804. unsigned int flags)
  1805. {
  1806. int fput_needed, err, datagrams;
  1807. struct socket *sock;
  1808. struct mmsghdr __user *entry;
  1809. struct compat_mmsghdr __user *compat_entry;
  1810. struct msghdr msg_sys;
  1811. struct used_address used_address;
  1812. if (vlen > UIO_MAXIOV)
  1813. vlen = UIO_MAXIOV;
  1814. datagrams = 0;
  1815. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1816. if (!sock)
  1817. return err;
  1818. used_address.name_len = UINT_MAX;
  1819. entry = mmsg;
  1820. compat_entry = (struct compat_mmsghdr __user *)mmsg;
  1821. err = 0;
  1822. while (datagrams < vlen) {
  1823. if (MSG_CMSG_COMPAT & flags) {
  1824. err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
  1825. &msg_sys, flags, &used_address);
  1826. if (err < 0)
  1827. break;
  1828. err = __put_user(err, &compat_entry->msg_len);
  1829. ++compat_entry;
  1830. } else {
  1831. err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
  1832. &msg_sys, flags, &used_address);
  1833. if (err < 0)
  1834. break;
  1835. err = put_user(err, &entry->msg_len);
  1836. ++entry;
  1837. }
  1838. if (err)
  1839. break;
  1840. ++datagrams;
  1841. }
  1842. fput_light(sock->file, fput_needed);
  1843. /* We only return an error if no datagrams were able to be sent */
  1844. if (datagrams != 0)
  1845. return datagrams;
  1846. return err;
  1847. }
  1848. SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
  1849. unsigned int, vlen, unsigned int, flags)
  1850. {
  1851. return __sys_sendmmsg(fd, mmsg, vlen, flags);
  1852. }
  1853. static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
  1854. struct msghdr *msg_sys, unsigned int flags, int nosec)
  1855. {
  1856. struct compat_msghdr __user *msg_compat =
  1857. (struct compat_msghdr __user *)msg;
  1858. struct iovec iovstack[UIO_FASTIOV];
  1859. struct iovec *iov = iovstack;
  1860. unsigned long cmsg_ptr;
  1861. int err, total_len, len;
  1862. /* kernel mode address */
  1863. struct sockaddr_storage addr;
  1864. /* user mode address pointers */
  1865. struct sockaddr __user *uaddr;
  1866. int __user *uaddr_len;
  1867. if (MSG_CMSG_COMPAT & flags) {
  1868. if (get_compat_msghdr(msg_sys, msg_compat))
  1869. return -EFAULT;
  1870. } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
  1871. return -EFAULT;
  1872. if (msg_sys->msg_iovlen > UIO_FASTIOV) {
  1873. err = -EMSGSIZE;
  1874. if (msg_sys->msg_iovlen > UIO_MAXIOV)
  1875. goto out;
  1876. err = -ENOMEM;
  1877. iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
  1878. GFP_KERNEL);
  1879. if (!iov)
  1880. goto out;
  1881. }
  1882. /*
  1883. * Save the user-mode address (verify_iovec will change the
  1884. * kernel msghdr to use the kernel address space)
  1885. */
  1886. uaddr = (__force void __user *)msg_sys->msg_name;
  1887. uaddr_len = COMPAT_NAMELEN(msg);
  1888. if (MSG_CMSG_COMPAT & flags) {
  1889. err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
  1890. } else
  1891. err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
  1892. if (err < 0)
  1893. goto out_freeiov;
  1894. total_len = err;
  1895. cmsg_ptr = (unsigned long)msg_sys->msg_control;
  1896. msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
  1897. if (sock->file->f_flags & O_NONBLOCK)
  1898. flags |= MSG_DONTWAIT;
  1899. err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
  1900. total_len, flags);
  1901. if (err < 0)
  1902. goto out_freeiov;
  1903. len = err;
  1904. if (uaddr != NULL) {
  1905. err = move_addr_to_user(&addr,
  1906. msg_sys->msg_namelen, uaddr,
  1907. uaddr_len);
  1908. if (err < 0)
  1909. goto out_freeiov;
  1910. }
  1911. err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
  1912. COMPAT_FLAGS(msg));
  1913. if (err)
  1914. goto out_freeiov;
  1915. if (MSG_CMSG_COMPAT & flags)
  1916. err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
  1917. &msg_compat->msg_controllen);
  1918. else
  1919. err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
  1920. &msg->msg_controllen);
  1921. if (err)
  1922. goto out_freeiov;
  1923. err = len;
  1924. out_freeiov:
  1925. if (iov != iovstack)
  1926. kfree(iov);
  1927. out:
  1928. return err;
  1929. }
  1930. /*
  1931. * BSD recvmsg interface
  1932. */
  1933. SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
  1934. unsigned int, flags)
  1935. {
  1936. int fput_needed, err;
  1937. struct msghdr msg_sys;
  1938. struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1939. if (!sock)
  1940. goto out;
  1941. err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
  1942. fput_light(sock->file, fput_needed);
  1943. out:
  1944. return err;
  1945. }
  1946. /*
  1947. * Linux recvmmsg interface
  1948. */
  1949. int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
  1950. unsigned int flags, struct timespec *timeout)
  1951. {
  1952. int fput_needed, err, datagrams;
  1953. struct socket *sock;
  1954. struct mmsghdr __user *entry;
  1955. struct compat_mmsghdr __user *compat_entry;
  1956. struct msghdr msg_sys;
  1957. struct timespec end_time;
  1958. if (timeout &&
  1959. poll_select_set_timeout(&end_time, timeout->tv_sec,
  1960. timeout->tv_nsec))
  1961. return -EINVAL;
  1962. datagrams = 0;
  1963. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1964. if (!sock)
  1965. return err;
  1966. err = sock_error(sock->sk);
  1967. if (err)
  1968. goto out_put;
  1969. entry = mmsg;
  1970. compat_entry = (struct compat_mmsghdr __user *)mmsg;
  1971. while (datagrams < vlen) {
  1972. /*
  1973. * No need to ask LSM for more than the first datagram.
  1974. */
  1975. if (MSG_CMSG_COMPAT & flags) {
  1976. err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
  1977. &msg_sys, flags & ~MSG_WAITFORONE,
  1978. datagrams);
  1979. if (err < 0)
  1980. break;
  1981. err = __put_user(err, &compat_entry->msg_len);
  1982. ++compat_entry;
  1983. } else {
  1984. err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
  1985. &msg_sys, flags & ~MSG_WAITFORONE,
  1986. datagrams);
  1987. if (err < 0)
  1988. break;
  1989. err = put_user(err, &entry->msg_len);
  1990. ++entry;
  1991. }
  1992. if (err)
  1993. break;
  1994. ++datagrams;
  1995. /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
  1996. if (flags & MSG_WAITFORONE)
  1997. flags |= MSG_DONTWAIT;
  1998. if (timeout) {
  1999. ktime_get_ts(timeout);
  2000. *timeout = timespec_sub(end_time, *timeout);
  2001. if (timeout->tv_sec < 0) {
  2002. timeout->tv_sec = timeout->tv_nsec = 0;
  2003. break;
  2004. }
  2005. /* Timeout, return less than vlen datagrams */
  2006. if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
  2007. break;
  2008. }
  2009. /* Out of band data, return right away */
  2010. if (msg_sys.msg_flags & MSG_OOB)
  2011. break;
  2012. }
  2013. out_put:
  2014. fput_light(sock->file, fput_needed);
  2015. if (err == 0)
  2016. return datagrams;
  2017. if (datagrams != 0) {
  2018. /*
  2019. * We may return less entries than requested (vlen) if the
  2020. * sock is non block and there aren't enough datagrams...
  2021. */
  2022. if (err != -EAGAIN) {
  2023. /*
  2024. * ... or if recvmsg returns an error after we
  2025. * received some datagrams, where we record the
  2026. * error to return on the next call or if the
  2027. * app asks about it using getsockopt(SO_ERROR).
  2028. */
  2029. sock->sk->sk_err = -err;
  2030. }
  2031. return datagrams;
  2032. }
  2033. return err;
  2034. }
  2035. SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
  2036. unsigned int, vlen, unsigned int, flags,
  2037. struct timespec __user *, timeout)
  2038. {
  2039. int datagrams;
  2040. struct timespec timeout_sys;
  2041. if (!timeout)
  2042. return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
  2043. if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
  2044. return -EFAULT;
  2045. datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
  2046. if (datagrams > 0 &&
  2047. copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
  2048. datagrams = -EFAULT;
  2049. return datagrams;
  2050. }
  2051. #ifdef __ARCH_WANT_SYS_SOCKETCALL
  2052. /* Argument list sizes for sys_socketcall */
  2053. #define AL(x) ((x) * sizeof(unsigned long))
  2054. static const unsigned char nargs[21] = {
  2055. AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
  2056. AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
  2057. AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
  2058. AL(4), AL(5), AL(4)
  2059. };
  2060. #undef AL
  2061. /*
  2062. * System call vectors.
  2063. *
  2064. * Argument checking cleaned up. Saved 20% in size.
  2065. * This function doesn't need to set the kernel lock because
  2066. * it is set by the callees.
  2067. */
  2068. SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
  2069. {
  2070. unsigned long a[6];
  2071. unsigned long a0, a1;
  2072. int err;
  2073. unsigned int len;
  2074. if (call < 1 || call > SYS_SENDMMSG)
  2075. return -EINVAL;
  2076. len = nargs[call];
  2077. if (len > sizeof(a))
  2078. return -EINVAL;
  2079. /* copy_from_user should be SMP safe. */
  2080. if (copy_from_user(a, args, len))
  2081. return -EFAULT;
  2082. audit_socketcall(nargs[call] / sizeof(unsigned long), a);
  2083. a0 = a[0];
  2084. a1 = a[1];
  2085. switch (call) {
  2086. case SYS_SOCKET:
  2087. err = sys_socket(a0, a1, a[2]);
  2088. break;
  2089. case SYS_BIND:
  2090. err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
  2091. break;
  2092. case SYS_CONNECT:
  2093. err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
  2094. break;
  2095. case SYS_LISTEN:
  2096. err = sys_listen(a0, a1);
  2097. break;
  2098. case SYS_ACCEPT:
  2099. err = sys_accept4(a0, (struct sockaddr __user *)a1,
  2100. (int __user *)a[2], 0);
  2101. break;
  2102. case SYS_GETSOCKNAME:
  2103. err =
  2104. sys_getsockname(a0, (struct sockaddr __user *)a1,
  2105. (int __user *)a[2]);
  2106. break;
  2107. case SYS_GETPEERNAME:
  2108. err =
  2109. sys_getpeername(a0, (struct sockaddr __user *)a1,
  2110. (int __user *)a[2]);
  2111. break;
  2112. case SYS_SOCKETPAIR:
  2113. err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
  2114. break;
  2115. case SYS_SEND:
  2116. err = sys_send(a0, (void __user *)a1, a[2], a[3]);
  2117. break;
  2118. case SYS_SENDTO:
  2119. err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
  2120. (struct sockaddr __user *)a[4], a[5]);
  2121. break;
  2122. case SYS_RECV:
  2123. err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
  2124. break;
  2125. case SYS_RECVFROM:
  2126. err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
  2127. (struct sockaddr __user *)a[4],
  2128. (int __user *)a[5]);
  2129. break;
  2130. case SYS_SHUTDOWN:
  2131. err = sys_shutdown(a0, a1);
  2132. break;
  2133. case SYS_SETSOCKOPT:
  2134. err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
  2135. break;
  2136. case SYS_GETSOCKOPT:
  2137. err =
  2138. sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
  2139. (int __user *)a[4]);
  2140. break;
  2141. case SYS_SENDMSG:
  2142. err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
  2143. break;
  2144. case SYS_SENDMMSG:
  2145. err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
  2146. break;
  2147. case SYS_RECVMSG:
  2148. err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
  2149. break;
  2150. case SYS_RECVMMSG:
  2151. err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
  2152. (struct timespec __user *)a[4]);
  2153. break;
  2154. case SYS_ACCEPT4:
  2155. err = sys_accept4(a0, (struct sockaddr __user *)a1,
  2156. (int __user *)a[2], a[3]);
  2157. break;
  2158. default:
  2159. err = -EINVAL;
  2160. break;
  2161. }
  2162. return err;
  2163. }
  2164. #endif /* __ARCH_WANT_SYS_SOCKETCALL */
  2165. /**
  2166. * sock_register - add a socket protocol handler
  2167. * @ops: description of protocol
  2168. *
  2169. * This function is called by a protocol handler that wants to
  2170. * advertise its address family, and have it linked into the
  2171. * socket interface. The value ops->family coresponds to the
  2172. * socket system call protocol family.
  2173. */
  2174. int sock_register(const struct net_proto_family *ops)
  2175. {
  2176. int err;
  2177. if (ops->family >= NPROTO) {
  2178. printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
  2179. NPROTO);
  2180. return -ENOBUFS;
  2181. }
  2182. spin_lock(&net_family_lock);
  2183. if (rcu_dereference_protected(net_families[ops->family],
  2184. lockdep_is_held(&net_family_lock)))
  2185. err = -EEXIST;
  2186. else {
  2187. rcu_assign_pointer(net_families[ops->family], ops);
  2188. err = 0;
  2189. }
  2190. spin_unlock(&net_family_lock);
  2191. printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
  2192. return err;
  2193. }
  2194. EXPORT_SYMBOL(sock_register);
  2195. /**
  2196. * sock_unregister - remove a protocol handler
  2197. * @family: protocol family to remove
  2198. *
  2199. * This function is called by a protocol handler that wants to
  2200. * remove its address family, and have it unlinked from the
  2201. * new socket creation.
  2202. *
  2203. * If protocol handler is a module, then it can use module reference
  2204. * counts to protect against new references. If protocol handler is not
  2205. * a module then it needs to provide its own protection in
  2206. * the ops->create routine.
  2207. */
  2208. void sock_unregister(int family)
  2209. {
  2210. BUG_ON(family < 0 || family >= NPROTO);
  2211. spin_lock(&net_family_lock);
  2212. RCU_INIT_POINTER(net_families[family], NULL);
  2213. spin_unlock(&net_family_lock);
  2214. synchronize_rcu();
  2215. printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
  2216. }
  2217. EXPORT_SYMBOL(sock_unregister);
  2218. static int __init sock_init(void)
  2219. {
  2220. int err;
  2221. /*
  2222. * Initialize the network sysctl infrastructure.
  2223. */
  2224. err = net_sysctl_init();
  2225. if (err)
  2226. goto out;
  2227. /*
  2228. * Initialize skbuff SLAB cache
  2229. */
  2230. skb_init();
  2231. /*
  2232. * Initialize the protocols module.
  2233. */
  2234. init_inodecache();
  2235. err = register_filesystem(&sock_fs_type);
  2236. if (err)
  2237. goto out_fs;
  2238. sock_mnt = kern_mount(&sock_fs_type);
  2239. if (IS_ERR(sock_mnt)) {
  2240. err = PTR_ERR(sock_mnt);
  2241. goto out_mount;
  2242. }
  2243. /* The real protocol initialization is performed in later initcalls.
  2244. */
  2245. #ifdef CONFIG_NETFILTER
  2246. netfilter_init();
  2247. #endif
  2248. #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
  2249. skb_timestamping_init();
  2250. #endif
  2251. out:
  2252. return err;
  2253. out_mount:
  2254. unregister_filesystem(&sock_fs_type);
  2255. out_fs:
  2256. goto out;
  2257. }
  2258. core_initcall(sock_init); /* early initcall */
  2259. #ifdef CONFIG_PROC_FS
  2260. void socket_seq_show(struct seq_file *seq)
  2261. {
  2262. int cpu;
  2263. int counter = 0;
  2264. for_each_possible_cpu(cpu)
  2265. counter += per_cpu(sockets_in_use, cpu);
  2266. /* It can be negative, by the way. 8) */
  2267. if (counter < 0)
  2268. counter = 0;
  2269. seq_printf(seq, "sockets: used %d\n", counter);
  2270. }
  2271. #endif /* CONFIG_PROC_FS */
  2272. #ifdef CONFIG_COMPAT
  2273. static int do_siocgstamp(struct net *net, struct socket *sock,
  2274. unsigned int cmd, void __user *up)
  2275. {
  2276. mm_segment_t old_fs = get_fs();
  2277. struct timeval ktv;
  2278. int err;
  2279. set_fs(KERNEL_DS);
  2280. err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
  2281. set_fs(old_fs);
  2282. if (!err)
  2283. err = compat_put_timeval(&ktv, up);
  2284. return err;
  2285. }
  2286. static int do_siocgstampns(struct net *net, struct socket *sock,
  2287. unsigned int cmd, void __user *up)
  2288. {
  2289. mm_segment_t old_fs = get_fs();
  2290. struct timespec kts;
  2291. int err;
  2292. set_fs(KERNEL_DS);
  2293. err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
  2294. set_fs(old_fs);
  2295. if (!err)
  2296. err = compat_put_timespec(&kts, up);
  2297. return err;
  2298. }
  2299. static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
  2300. {
  2301. struct ifreq __user *uifr;
  2302. int err;
  2303. uifr = compat_alloc_user_space(sizeof(struct ifreq));
  2304. if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
  2305. return -EFAULT;
  2306. err = dev_ioctl(net, SIOCGIFNAME, uifr);
  2307. if (err)
  2308. return err;
  2309. if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
  2310. return -EFAULT;
  2311. return 0;
  2312. }
  2313. static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
  2314. {
  2315. struct compat_ifconf ifc32;
  2316. struct ifconf ifc;
  2317. struct ifconf __user *uifc;
  2318. struct compat_ifreq __user *ifr32;
  2319. struct ifreq __user *ifr;
  2320. unsigned int i, j;
  2321. int err;
  2322. if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
  2323. return -EFAULT;
  2324. memset(&ifc, 0, sizeof(ifc));
  2325. if (ifc32.ifcbuf == 0) {
  2326. ifc32.ifc_len = 0;
  2327. ifc.ifc_len = 0;
  2328. ifc.ifc_req = NULL;
  2329. uifc = compat_alloc_user_space(sizeof(struct ifconf));
  2330. } else {
  2331. size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
  2332. sizeof(struct ifreq);
  2333. uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
  2334. ifc.ifc_len = len;
  2335. ifr = ifc.ifc_req = (void __user *)(uifc + 1);
  2336. ifr32 = compat_ptr(ifc32.ifcbuf);
  2337. for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
  2338. if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
  2339. return -EFAULT;
  2340. ifr++;
  2341. ifr32++;
  2342. }
  2343. }
  2344. if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
  2345. return -EFAULT;
  2346. err = dev_ioctl(net, SIOCGIFCONF, uifc);
  2347. if (err)
  2348. return err;
  2349. if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
  2350. return -EFAULT;
  2351. ifr = ifc.ifc_req;
  2352. ifr32 = compat_ptr(ifc32.ifcbuf);
  2353. for (i = 0, j = 0;
  2354. i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
  2355. i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
  2356. if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
  2357. return -EFAULT;
  2358. ifr32++;
  2359. ifr++;
  2360. }
  2361. if (ifc32.ifcbuf == 0) {
  2362. /* Translate from 64-bit structure multiple to
  2363. * a 32-bit one.
  2364. */
  2365. i = ifc.ifc_len;
  2366. i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
  2367. ifc32.ifc_len = i;
  2368. } else {
  2369. ifc32.ifc_len = i;
  2370. }
  2371. if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
  2372. return -EFAULT;
  2373. return 0;
  2374. }
  2375. static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
  2376. {
  2377. struct compat_ethtool_rxnfc __user *compat_rxnfc;
  2378. bool convert_in = false, convert_out = false;
  2379. size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
  2380. struct ethtool_rxnfc __user *rxnfc;
  2381. struct ifreq __user *ifr;
  2382. u32 rule_cnt = 0, actual_rule_cnt;
  2383. u32 ethcmd;
  2384. u32 data;
  2385. int ret;
  2386. if (get_user(data, &ifr32->ifr_ifru.ifru_data))
  2387. return -EFAULT;
  2388. compat_rxnfc = compat_ptr(data);
  2389. if (get_user(ethcmd, &compat_rxnfc->cmd))
  2390. return -EFAULT;
  2391. /* Most ethtool structures are defined without padding.
  2392. * Unfortunately struct ethtool_rxnfc is an exception.
  2393. */
  2394. switch (ethcmd) {
  2395. default:
  2396. break;
  2397. case ETHTOOL_GRXCLSRLALL:
  2398. /* Buffer size is variable */
  2399. if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
  2400. return -EFAULT;
  2401. if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
  2402. return -ENOMEM;
  2403. buf_size += rule_cnt * sizeof(u32);
  2404. /* fall through */
  2405. case ETHTOOL_GRXRINGS:
  2406. case ETHTOOL_GRXCLSRLCNT:
  2407. case ETHTOOL_GRXCLSRULE:
  2408. case ETHTOOL_SRXCLSRLINS:
  2409. convert_out = true;
  2410. /* fall through */
  2411. case ETHTOOL_SRXCLSRLDEL:
  2412. buf_size += sizeof(struct ethtool_rxnfc);
  2413. convert_in = true;
  2414. break;
  2415. }
  2416. ifr = compat_alloc_user_space(buf_size);
  2417. rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);
  2418. if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
  2419. return -EFAULT;
  2420. if (put_user(convert_in ? rxnfc : compat_ptr(data),
  2421. &ifr->ifr_ifru.ifru_data))
  2422. return -EFAULT;
  2423. if (convert_in) {
  2424. /* We expect there to be holes between fs.m_ext and
  2425. * fs.ring_cookie and at the end of fs, but nowhere else.
  2426. */
  2427. BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
  2428. sizeof(compat_rxnfc->fs.m_ext) !=
  2429. offsetof(struct ethtool_rxnfc, fs.m_ext) +
  2430. sizeof(rxnfc->fs.m_ext));
  2431. BUILD_BUG_ON(
  2432. offsetof(struct compat_ethtool_rxnfc, fs.location) -
  2433. offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
  2434. offsetof(struct ethtool_rxnfc, fs.location) -
  2435. offsetof(struct ethtool_rxnfc, fs.ring_cookie));
  2436. if (copy_in_user(rxnfc, compat_rxnfc,
  2437. (void *)(&rxnfc->fs.m_ext + 1) -
  2438. (void *)rxnfc) ||
  2439. copy_in_user(&rxnfc->fs.ring_cookie,
  2440. &compat_rxnfc->fs.ring_cookie,
  2441. (void *)(&rxnfc->fs.location + 1) -
  2442. (void *)&rxnfc->fs.ring_cookie) ||
  2443. copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
  2444. sizeof(rxnfc->rule_cnt)))
  2445. return -EFAULT;
  2446. }
  2447. ret = dev_ioctl(net, SIOCETHTOOL, ifr);
  2448. if (ret)
  2449. return ret;
  2450. if (convert_out) {
  2451. if (copy_in_user(compat_rxnfc, rxnfc,
  2452. (const void *)(&rxnfc->fs.m_ext + 1) -
  2453. (const void *)rxnfc) ||
  2454. copy_in_user(&compat_rxnfc->fs.ring_cookie,
  2455. &rxnfc->fs.ring_cookie,
  2456. (const void *)(&rxnfc->fs.location + 1) -
  2457. (const void *)&rxnfc->fs.ring_cookie) ||
  2458. copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
  2459. sizeof(rxnfc->rule_cnt)))
  2460. return -EFAULT;
  2461. if (ethcmd == ETHTOOL_GRXCLSRLALL) {
  2462. /* As an optimisation, we only copy the actual
  2463. * number of rules that the underlying
  2464. * function returned. Since Mallory might
  2465. * change the rule count in user memory, we
  2466. * check that it is less than the rule count
  2467. * originally given (as the user buffer size),
  2468. * which has been range-checked.
  2469. */
  2470. if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
  2471. return -EFAULT;
  2472. if (actual_rule_cnt < rule_cnt)
  2473. rule_cnt = actual_rule_cnt;
  2474. if (copy_in_user(&compat_rxnfc->rule_locs[0],
  2475. &rxnfc->rule_locs[0],
  2476. rule_cnt * sizeof(u32)))
  2477. return -EFAULT;
  2478. }
  2479. }
  2480. return 0;
  2481. }
  2482. static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
  2483. {
  2484. void __user *uptr;
  2485. compat_uptr_t uptr32;
  2486. struct ifreq __user *uifr;
  2487. uifr = compat_alloc_user_space(sizeof(*uifr));
  2488. if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
  2489. return -EFAULT;
  2490. if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
  2491. return -EFAULT;
  2492. uptr = compat_ptr(uptr32);
  2493. if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
  2494. return -EFAULT;
  2495. return dev_ioctl(net, SIOCWANDEV, uifr);
  2496. }
  2497. static int bond_ioctl(struct net *net, unsigned int cmd,
  2498. struct compat_ifreq __user *ifr32)
  2499. {
  2500. struct ifreq kifr;
  2501. struct ifreq __user *uifr;
  2502. mm_segment_t old_fs;
  2503. int err;
  2504. u32 data;
  2505. void __user *datap;
  2506. switch (cmd) {
  2507. case SIOCBONDENSLAVE:
  2508. case SIOCBONDRELEASE:
  2509. case SIOCBONDSETHWADDR:
  2510. case SIOCBONDCHANGEACTIVE:
  2511. if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
  2512. return -EFAULT;
  2513. old_fs = get_fs();
  2514. set_fs(KERNEL_DS);
  2515. err = dev_ioctl(net, cmd,
  2516. (struct ifreq __user __force *) &kifr);
  2517. set_fs(old_fs);
  2518. return err;
  2519. case SIOCBONDSLAVEINFOQUERY:
  2520. case SIOCBONDINFOQUERY:
  2521. uifr = compat_alloc_user_space(sizeof(*uifr));
  2522. if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
  2523. return -EFAULT;
  2524. if (get_user(data, &ifr32->ifr_ifru.ifru_data))
  2525. return -EFAULT;
  2526. datap = compat_ptr(data);
  2527. if (put_user(datap, &uifr->ifr_ifru.ifru_data))
  2528. return -EFAULT;
  2529. return dev_ioctl(net, cmd, uifr);
  2530. default:
  2531. return -ENOIOCTLCMD;
  2532. }
  2533. }
  2534. static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
  2535. struct compat_ifreq __user *u_ifreq32)
  2536. {
  2537. struct ifreq __user *u_ifreq64;
  2538. char tmp_buf[IFNAMSIZ];
  2539. void __user *data64;
  2540. u32 data32;
  2541. if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
  2542. IFNAMSIZ))
  2543. return -EFAULT;
  2544. if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
  2545. return -EFAULT;
  2546. data64 = compat_ptr(data32);
  2547. u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
  2548. /* Don't check these user accesses, just let that get trapped
  2549. * in the ioctl handler instead.
  2550. */
  2551. if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
  2552. IFNAMSIZ))
  2553. return -EFAULT;
  2554. if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
  2555. return -EFAULT;
  2556. return dev_ioctl(net, cmd, u_ifreq64);
  2557. }
  2558. static int dev_ifsioc(struct net *net, struct socket *sock,
  2559. unsigned int cmd, struct compat_ifreq __user *uifr32)
  2560. {
  2561. struct ifreq __user *uifr;
  2562. int err;
  2563. uifr = compat_alloc_user_space(sizeof(*uifr));
  2564. if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
  2565. return -EFAULT;
  2566. err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
  2567. if (!err) {
  2568. switch (cmd) {
  2569. case SIOCGIFFLAGS:
  2570. case SIOCGIFMETRIC:
  2571. case SIOCGIFMTU:
  2572. case SIOCGIFMEM:
  2573. case SIOCGIFHWADDR:
  2574. case SIOCGIFINDEX:
  2575. case SIOCGIFADDR:
  2576. case SIOCGIFBRDADDR:
  2577. case SIOCGIFDSTADDR:
  2578. case SIOCGIFNETMASK:
  2579. case SIOCGIFPFLAGS:
  2580. case SIOCGIFTXQLEN:
  2581. case SIOCGMIIPHY:
  2582. case SIOCGMIIREG:
  2583. if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
  2584. err = -EFAULT;
  2585. break;
  2586. }
  2587. }
  2588. return err;
  2589. }
  2590. static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
  2591. struct compat_ifreq __user *uifr32)
  2592. {
  2593. struct ifreq ifr;
  2594. struct compat_ifmap __user *uifmap32;
  2595. mm_segment_t old_fs;
  2596. int err;
  2597. uifmap32 = &uifr32->ifr_ifru.ifru_map;
  2598. err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
  2599. err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
  2600. err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
  2601. err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
  2602. err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
  2603. err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
  2604. err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
  2605. if (err)
  2606. return -EFAULT;
  2607. old_fs = get_fs();
  2608. set_fs(KERNEL_DS);
  2609. err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
  2610. set_fs(old_fs);
  2611. if (cmd == SIOCGIFMAP && !err) {
  2612. err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
  2613. err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
  2614. err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
  2615. err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
  2616. err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
  2617. err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
  2618. err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
  2619. if (err)
  2620. err = -EFAULT;
  2621. }
  2622. return err;
  2623. }
  2624. static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
  2625. {
  2626. void __user *uptr;
  2627. compat_uptr_t uptr32;
  2628. struct ifreq __user *uifr;
  2629. uifr = compat_alloc_user_space(sizeof(*uifr));
  2630. if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
  2631. return -EFAULT;
  2632. if (get_user(uptr32, &uifr32->ifr_data))
  2633. return -EFAULT;
  2634. uptr = compat_ptr(uptr32);
  2635. if (put_user(uptr, &uifr->ifr_data))
  2636. return -EFAULT;
  2637. return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
  2638. }
  2639. struct rtentry32 {
  2640. u32 rt_pad1;
  2641. struct sockaddr rt_dst; /* target address */
  2642. struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
  2643. struct sockaddr rt_genmask; /* target network mask (IP) */
  2644. unsigned short rt_flags;
  2645. short rt_pad2;
  2646. u32 rt_pad3;
  2647. unsigned char rt_tos;
  2648. unsigned char rt_class;
  2649. short rt_pad4;
  2650. short rt_metric; /* +1 for binary compatibility! */
  2651. /* char * */ u32 rt_dev; /* forcing the device at add */
  2652. u32 rt_mtu; /* per route MTU/Window */
  2653. u32 rt_window; /* Window clamping */
  2654. unsigned short rt_irtt; /* Initial RTT */
  2655. };
  2656. struct in6_rtmsg32 {
  2657. struct in6_addr rtmsg_dst;
  2658. struct in6_addr rtmsg_src;
  2659. struct in6_addr rtmsg_gateway;
  2660. u32 rtmsg_type;
  2661. u16 rtmsg_dst_len;
  2662. u16 rtmsg_src_len;
  2663. u32 rtmsg_metric;
  2664. u32 rtmsg_info;
  2665. u32 rtmsg_flags;
  2666. s32 rtmsg_ifindex;
  2667. };
  2668. static int routing_ioctl(struct net *net, struct socket *sock,
  2669. unsigned int cmd, void __user *argp)
  2670. {
  2671. int ret;
  2672. void *r = NULL;
  2673. struct in6_rtmsg r6;
  2674. struct rtentry r4;
  2675. char devname[16];
  2676. u32 rtdev;
  2677. mm_segment_t old_fs = get_fs();
  2678. if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
  2679. struct in6_rtmsg32 __user *ur6 = argp;
  2680. ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
  2681. 3 * sizeof(struct in6_addr));
  2682. ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
  2683. ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
  2684. ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
  2685. ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
  2686. ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
  2687. ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
  2688. ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
  2689. r = (void *) &r6;
  2690. } else { /* ipv4 */
  2691. struct rtentry32 __user *ur4 = argp;
  2692. ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
  2693. 3 * sizeof(struct sockaddr));
  2694. ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
  2695. ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
  2696. ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
  2697. ret |= __get_user(r4.rt_window, &(ur4->rt_window));
  2698. ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
  2699. ret |= __get_user(rtdev, &(ur4->rt_dev));
  2700. if (rtdev) {
  2701. ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
  2702. r4.rt_dev = (char __user __force *)devname;
  2703. devname[15] = 0;
  2704. } else
  2705. r4.rt_dev = NULL;
  2706. r = (void *) &r4;
  2707. }
  2708. if (ret) {
  2709. ret = -EFAULT;
  2710. goto out;
  2711. }
  2712. set_fs(KERNEL_DS);
  2713. ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
  2714. set_fs(old_fs);
  2715. out:
  2716. return ret;
  2717. }
  2718. /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
  2719. * for some operations; this forces use of the newer bridge-utils that
  2720. * use compatible ioctls
  2721. */
  2722. static int old_bridge_ioctl(compat_ulong_t __user *argp)
  2723. {
  2724. compat_ulong_t tmp;
  2725. if (get_user(tmp, argp))
  2726. return -EFAULT;
  2727. if (tmp == BRCTL_GET_VERSION)
  2728. return BRCTL_VERSION + 1;
  2729. return -EINVAL;
  2730. }
  2731. static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
  2732. unsigned int cmd, unsigned long arg)
  2733. {
  2734. void __user *argp = compat_ptr(arg);
  2735. struct sock *sk = sock->sk;
  2736. struct net *net = sock_net(sk);
  2737. if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
  2738. return siocdevprivate_ioctl(net, cmd, argp);
  2739. switch (cmd) {
  2740. case SIOCSIFBR:
  2741. case SIOCGIFBR:
  2742. return old_bridge_ioctl(argp);
  2743. case SIOCGIFNAME:
  2744. return dev_ifname32(net, argp);
  2745. case SIOCGIFCONF:
  2746. return dev_ifconf(net, argp);
  2747. case SIOCETHTOOL:
  2748. return ethtool_ioctl(net, argp);
  2749. case SIOCWANDEV:
  2750. return compat_siocwandev(net, argp);
  2751. case SIOCGIFMAP:
  2752. case SIOCSIFMAP:
  2753. return compat_sioc_ifmap(net, cmd, argp);
  2754. case SIOCBONDENSLAVE:
  2755. case SIOCBONDRELEASE:
  2756. case SIOCBONDSETHWADDR:
  2757. case SIOCBONDSLAVEINFOQUERY:
  2758. case SIOCBONDINFOQUERY:
  2759. case SIOCBONDCHANGEACTIVE:
  2760. return bond_ioctl(net, cmd, argp);
  2761. case SIOCADDRT:
  2762. case SIOCDELRT:
  2763. return routing_ioctl(net, sock, cmd, argp);
  2764. case SIOCGSTAMP:
  2765. return do_siocgstamp(net, sock, cmd, argp);
  2766. case SIOCGSTAMPNS:
  2767. return do_siocgstampns(net, sock, cmd, argp);
  2768. case SIOCSHWTSTAMP:
  2769. return compat_siocshwtstamp(net, argp);
  2770. case FIOSETOWN:
  2771. case SIOCSPGRP:
  2772. case FIOGETOWN:
  2773. case SIOCGPGRP:
  2774. case SIOCBRADDBR:
  2775. case SIOCBRDELBR:
  2776. case SIOCGIFVLAN:
  2777. case SIOCSIFVLAN:
  2778. case SIOCADDDLCI:
  2779. case SIOCDELDLCI:
  2780. return sock_ioctl(file, cmd, arg);
  2781. case SIOCGIFFLAGS:
  2782. case SIOCSIFFLAGS:
  2783. case SIOCGIFMETRIC:
  2784. case SIOCSIFMETRIC:
  2785. case SIOCGIFMTU:
  2786. case SIOCSIFMTU:
  2787. case SIOCGIFMEM:
  2788. case SIOCSIFMEM:
  2789. case SIOCGIFHWADDR:
  2790. case SIOCSIFHWADDR:
  2791. case SIOCADDMULTI:
  2792. case SIOCDELMULTI:
  2793. case SIOCGIFINDEX:
  2794. case SIOCGIFADDR:
  2795. case SIOCSIFADDR:
  2796. case SIOCSIFHWBROADCAST:
  2797. case SIOCDIFADDR:
  2798. case SIOCGIFBRDADDR:
  2799. case SIOCSIFBRDADDR:
  2800. case SIOCGIFDSTADDR:
  2801. case SIOCSIFDSTADDR:
  2802. case SIOCGIFNETMASK:
  2803. case SIOCSIFNETMASK:
  2804. case SIOCSIFPFLAGS:
  2805. case SIOCGIFPFLAGS:
  2806. case SIOCGIFTXQLEN:
  2807. case SIOCSIFTXQLEN:
  2808. case SIOCBRADDIF:
  2809. case SIOCBRDELIF:
  2810. case SIOCSIFNAME:
  2811. case SIOCGMIIPHY:
  2812. case SIOCGMIIREG:
  2813. case SIOCSMIIREG:
  2814. return dev_ifsioc(net, sock, cmd, argp);
  2815. case SIOCSARP:
  2816. case SIOCGARP:
  2817. case SIOCDARP:
  2818. case SIOCATMARK:
  2819. return sock_do_ioctl(net, sock, cmd, arg);
  2820. }
  2821. return -ENOIOCTLCMD;
  2822. }
  2823. static long compat_sock_ioctl(struct file *file, unsigned int cmd,
  2824. unsigned long arg)
  2825. {
  2826. struct socket *sock = file->private_data;
  2827. int ret = -ENOIOCTLCMD;
  2828. struct sock *sk;
  2829. struct net *net;
  2830. sk = sock->sk;
  2831. net = sock_net(sk);
  2832. if (sock->ops->compat_ioctl)
  2833. ret = sock->ops->compat_ioctl(sock, cmd, arg);
  2834. if (ret == -ENOIOCTLCMD &&
  2835. (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
  2836. ret = compat_wext_handle_ioctl(net, cmd, arg);
  2837. if (ret == -ENOIOCTLCMD)
  2838. ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
  2839. return ret;
  2840. }
  2841. #endif
  2842. int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
  2843. {
  2844. return sock->ops->bind(sock, addr, addrlen);
  2845. }
  2846. EXPORT_SYMBOL(kernel_bind);
  2847. int kernel_listen(struct socket *sock, int backlog)
  2848. {
  2849. return sock->ops->listen(sock, backlog);
  2850. }
  2851. EXPORT_SYMBOL(kernel_listen);
  2852. int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
  2853. {
  2854. struct sock *sk = sock->sk;
  2855. int err;
  2856. err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
  2857. newsock);
  2858. if (err < 0)
  2859. goto done;
  2860. err = sock->ops->accept(sock, *newsock, flags);
  2861. if (err < 0) {
  2862. sock_release(*newsock);
  2863. *newsock = NULL;
  2864. goto done;
  2865. }
  2866. (*newsock)->ops = sock->ops;
  2867. __module_get((*newsock)->ops->owner);
  2868. done:
  2869. return err;
  2870. }
  2871. EXPORT_SYMBOL(kernel_accept);
  2872. int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
  2873. int flags)
  2874. {
  2875. return sock->ops->connect(sock, addr, addrlen, flags);
  2876. }
  2877. EXPORT_SYMBOL(kernel_connect);
  2878. int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
  2879. int *addrlen)
  2880. {
  2881. return sock->ops->getname(sock, addr, addrlen, 0);
  2882. }
  2883. EXPORT_SYMBOL(kernel_getsockname);
  2884. int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
  2885. int *addrlen)
  2886. {
  2887. return sock->ops->getname(sock, addr, addrlen, 1);
  2888. }
  2889. EXPORT_SYMBOL(kernel_getpeername);
  2890. int kernel_getsockopt(struct socket *sock, int level, int optname,
  2891. char *optval, int *optlen)
  2892. {
  2893. mm_segment_t oldfs = get_fs();
  2894. char __user *uoptval;
  2895. int __user *uoptlen;
  2896. int err;
  2897. uoptval = (char __user __force *) optval;
  2898. uoptlen = (int __user __force *) optlen;
  2899. set_fs(KERNEL_DS);
  2900. if (level == SOL_SOCKET)
  2901. err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
  2902. else
  2903. err = sock->ops->getsockopt(sock, level, optname, uoptval,
  2904. uoptlen);
  2905. set_fs(oldfs);
  2906. return err;
  2907. }
  2908. EXPORT_SYMBOL(kernel_getsockopt);
  2909. int kernel_setsockopt(struct socket *sock, int level, int optname,
  2910. char *optval, unsigned int optlen)
  2911. {
  2912. mm_segment_t oldfs = get_fs();
  2913. char __user *uoptval;
  2914. int err;
  2915. uoptval = (char __user __force *) optval;
  2916. set_fs(KERNEL_DS);
  2917. if (level == SOL_SOCKET)
  2918. err = sock_setsockopt(sock, level, optname, uoptval, optlen);
  2919. else
  2920. err = sock->ops->setsockopt(sock, level, optname, uoptval,
  2921. optlen);
  2922. set_fs(oldfs);
  2923. return err;
  2924. }
  2925. EXPORT_SYMBOL(kernel_setsockopt);
  2926. int kernel_sendpage(struct socket *sock, struct page *page, int offset,
  2927. size_t size, int flags)
  2928. {
  2929. sock_update_classid(sock->sk);
  2930. if (sock->ops->sendpage)
  2931. return sock->ops->sendpage(sock, page, offset, size, flags);
  2932. return sock_no_sendpage(sock, page, offset, size, flags);
  2933. }
  2934. EXPORT_SYMBOL(kernel_sendpage);
  2935. int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
  2936. {
  2937. mm_segment_t oldfs = get_fs();
  2938. int err;
  2939. set_fs(KERNEL_DS);
  2940. err = sock->ops->ioctl(sock, cmd, arg);
  2941. set_fs(oldfs);
  2942. return err;
  2943. }
  2944. EXPORT_SYMBOL(kernel_sock_ioctl);
  2945. int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
  2946. {
  2947. return sock->ops->shutdown(sock, how);
  2948. }
  2949. EXPORT_SYMBOL(kernel_sock_shutdown);