socket.c 84 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/if_bridge.h>
  72. #include <linux/if_frad.h>
  73. #include <linux/if_vlan.h>
  74. #include <linux/init.h>
  75. #include <linux/poll.h>
  76. #include <linux/cache.h>
  77. #include <linux/module.h>
  78. #include <linux/highmem.h>
  79. #include <linux/mount.h>
  80. #include <linux/security.h>
  81. #include <linux/syscalls.h>
  82. #include <linux/compat.h>
  83. #include <linux/kmod.h>
  84. #include <linux/audit.h>
  85. #include <linux/wireless.h>
  86. #include <linux/nsproxy.h>
  87. #include <linux/magic.h>
  88. #include <linux/slab.h>
  89. #include <linux/xattr.h>
  90. #include <asm/uaccess.h>
  91. #include <asm/unistd.h>
  92. #include <net/compat.h>
  93. #include <net/wext.h>
  94. #include <net/cls_cgroup.h>
  95. #include <net/sock.h>
  96. #include <linux/netfilter.h>
  97. #include <linux/if_tun.h>
  98. #include <linux/ipv6_route.h>
  99. #include <linux/route.h>
  100. #include <linux/sockios.h>
  101. #include <linux/atalk.h>
  102. #include <net/busy_poll.h>
  103. #ifdef CONFIG_NET_RX_BUSY_POLL
  104. unsigned int sysctl_net_busy_read __read_mostly;
  105. unsigned int sysctl_net_busy_poll __read_mostly;
  106. #endif
  107. static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
  108. static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
  109. unsigned long nr_segs, loff_t pos);
  110. static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
  111. unsigned long nr_segs, loff_t pos);
  112. static int sock_mmap(struct file *file, struct vm_area_struct *vma);
  113. static int sock_close(struct inode *inode, struct file *file);
  114. static unsigned int sock_poll(struct file *file,
  115. struct poll_table_struct *wait);
  116. static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
  117. #ifdef CONFIG_COMPAT
  118. static long compat_sock_ioctl(struct file *file,
  119. unsigned int cmd, unsigned long arg);
  120. #endif
  121. static int sock_fasync(int fd, struct file *filp, int on);
  122. static ssize_t sock_sendpage(struct file *file, struct page *page,
  123. int offset, size_t size, loff_t *ppos, int more);
  124. static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
  125. struct pipe_inode_info *pipe, size_t len,
  126. unsigned int flags);
  127. /*
  128. * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
  129. * in the operation structures but are done directly via the socketcall() multiplexor.
  130. */
  131. static const struct file_operations socket_file_ops = {
  132. .owner = THIS_MODULE,
  133. .llseek = no_llseek,
  134. .aio_read = sock_aio_read,
  135. .aio_write = sock_aio_write,
  136. .poll = sock_poll,
  137. .unlocked_ioctl = sock_ioctl,
  138. #ifdef CONFIG_COMPAT
  139. .compat_ioctl = compat_sock_ioctl,
  140. #endif
  141. .mmap = sock_mmap,
  142. .open = sock_no_open, /* special open code to disallow open via /proc */
  143. .release = sock_close,
  144. .fasync = sock_fasync,
  145. .sendpage = sock_sendpage,
  146. .splice_write = generic_splice_sendpage,
  147. .splice_read = sock_splice_read,
  148. };
  149. /*
  150. * The protocol list. Each protocol is registered in here.
  151. */
  152. static DEFINE_SPINLOCK(net_family_lock);
  153. static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
  154. /*
  155. * Statistics counters of the socket lists
  156. */
  157. static DEFINE_PER_CPU(int, sockets_in_use);
  158. /*
  159. * Support routines.
  160. * Move socket addresses back and forth across the kernel/user
  161. * divide and look after the messy bits.
  162. */
  163. /**
  164. * move_addr_to_kernel - copy a socket address into kernel space
  165. * @uaddr: Address in user space
  166. * @kaddr: Address in kernel space
  167. * @ulen: Length in user space
  168. *
  169. * The address is copied into kernel space. If the provided address is
  170. * too long an error code of -EINVAL is returned. If the copy gives
  171. * invalid addresses -EFAULT is returned. On a success 0 is returned.
  172. */
  173. int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
  174. {
  175. if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
  176. return -EINVAL;
  177. if (ulen == 0)
  178. return 0;
  179. if (copy_from_user(kaddr, uaddr, ulen))
  180. return -EFAULT;
  181. return audit_sockaddr(ulen, kaddr);
  182. }
  183. /**
  184. * move_addr_to_user - copy an address to user space
  185. * @kaddr: kernel space address
  186. * @klen: length of address in kernel
  187. * @uaddr: user space address
  188. * @ulen: pointer to user length field
  189. *
  190. * The value pointed to by ulen on entry is the buffer length available.
  191. * This is overwritten with the buffer space used. -EINVAL is returned
  192. * if an overlong buffer is specified or a negative buffer size. -EFAULT
  193. * is returned if either the buffer or the length field are not
  194. * accessible.
  195. * After copying the data up to the limit the user specifies, the true
  196. * length of the data is written over the length limit the user
  197. * specified. Zero is returned for a success.
  198. */
  199. static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
  200. void __user *uaddr, int __user *ulen)
  201. {
  202. int err;
  203. int len;
  204. BUG_ON(klen > sizeof(struct sockaddr_storage));
  205. err = get_user(len, ulen);
  206. if (err)
  207. return err;
  208. if (len > klen)
  209. len = klen;
  210. if (len < 0)
  211. return -EINVAL;
  212. if (len) {
  213. if (audit_sockaddr(klen, kaddr))
  214. return -ENOMEM;
  215. if (copy_to_user(uaddr, kaddr, len))
  216. return -EFAULT;
  217. }
  218. /*
  219. * "fromlen shall refer to the value before truncation.."
  220. * 1003.1g
  221. */
  222. return __put_user(klen, ulen);
  223. }
  224. static struct kmem_cache *sock_inode_cachep __read_mostly;
  225. static struct inode *sock_alloc_inode(struct super_block *sb)
  226. {
  227. struct socket_alloc *ei;
  228. struct socket_wq *wq;
  229. ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
  230. if (!ei)
  231. return NULL;
  232. wq = kmalloc(sizeof(*wq), GFP_KERNEL);
  233. if (!wq) {
  234. kmem_cache_free(sock_inode_cachep, ei);
  235. return NULL;
  236. }
  237. init_waitqueue_head(&wq->wait);
  238. wq->fasync_list = NULL;
  239. RCU_INIT_POINTER(ei->socket.wq, wq);
  240. ei->socket.state = SS_UNCONNECTED;
  241. ei->socket.flags = 0;
  242. ei->socket.ops = NULL;
  243. ei->socket.sk = NULL;
  244. ei->socket.file = NULL;
  245. return &ei->vfs_inode;
  246. }
  247. static void sock_destroy_inode(struct inode *inode)
  248. {
  249. struct socket_alloc *ei;
  250. struct socket_wq *wq;
  251. ei = container_of(inode, struct socket_alloc, vfs_inode);
  252. wq = rcu_dereference_protected(ei->socket.wq, 1);
  253. kfree_rcu(wq, rcu);
  254. kmem_cache_free(sock_inode_cachep, ei);
  255. }
  256. static void init_once(void *foo)
  257. {
  258. struct socket_alloc *ei = (struct socket_alloc *)foo;
  259. inode_init_once(&ei->vfs_inode);
  260. }
  261. static int init_inodecache(void)
  262. {
  263. sock_inode_cachep = kmem_cache_create("sock_inode_cache",
  264. sizeof(struct socket_alloc),
  265. 0,
  266. (SLAB_HWCACHE_ALIGN |
  267. SLAB_RECLAIM_ACCOUNT |
  268. SLAB_MEM_SPREAD),
  269. init_once);
  270. if (sock_inode_cachep == NULL)
  271. return -ENOMEM;
  272. return 0;
  273. }
  274. static const struct super_operations sockfs_ops = {
  275. .alloc_inode = sock_alloc_inode,
  276. .destroy_inode = sock_destroy_inode,
  277. .statfs = simple_statfs,
  278. };
  279. /*
  280. * sockfs_dname() is called from d_path().
  281. */
  282. static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
  283. {
  284. return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
  285. dentry->d_inode->i_ino);
  286. }
  287. static const struct dentry_operations sockfs_dentry_operations = {
  288. .d_dname = sockfs_dname,
  289. };
  290. static struct dentry *sockfs_mount(struct file_system_type *fs_type,
  291. int flags, const char *dev_name, void *data)
  292. {
  293. return mount_pseudo(fs_type, "socket:", &sockfs_ops,
  294. &sockfs_dentry_operations, SOCKFS_MAGIC);
  295. }
  296. static struct vfsmount *sock_mnt __read_mostly;
  297. static struct file_system_type sock_fs_type = {
  298. .name = "sockfs",
  299. .mount = sockfs_mount,
  300. .kill_sb = kill_anon_super,
  301. };
  302. /*
  303. * Obtains the first available file descriptor and sets it up for use.
  304. *
  305. * These functions create file structures and maps them to fd space
  306. * of the current process. On success it returns file descriptor
  307. * and file struct implicitly stored in sock->file.
  308. * Note that another thread may close file descriptor before we return
  309. * from this function. We use the fact that now we do not refer
  310. * to socket after mapping. If one day we will need it, this
  311. * function will increment ref. count on file by 1.
  312. *
  313. * In any case returned fd MAY BE not valid!
  314. * This race condition is unavoidable
  315. * with shared fd spaces, we cannot solve it inside kernel,
  316. * but we take care of internal coherence yet.
  317. */
  318. struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
  319. {
  320. struct qstr name = { .name = "" };
  321. struct path path;
  322. struct file *file;
  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. return ERR_PTR(-ENOMEM);
  333. path.mnt = mntget(sock_mnt);
  334. d_instantiate(path.dentry, SOCK_INODE(sock));
  335. SOCK_INODE(sock)->i_fop = &socket_file_ops;
  336. file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
  337. &socket_file_ops);
  338. if (unlikely(IS_ERR(file))) {
  339. /* drop dentry, keep inode */
  340. ihold(path.dentry->d_inode);
  341. path_put(&path);
  342. return file;
  343. }
  344. sock->file = file;
  345. file->f_flags = O_RDWR | (flags & O_NONBLOCK);
  346. file->private_data = sock;
  347. return file;
  348. }
  349. EXPORT_SYMBOL(sock_alloc_file);
  350. static int sock_map_fd(struct socket *sock, int flags)
  351. {
  352. struct file *newfile;
  353. int fd = get_unused_fd_flags(flags);
  354. if (unlikely(fd < 0))
  355. return fd;
  356. newfile = sock_alloc_file(sock, flags, NULL);
  357. if (likely(!IS_ERR(newfile))) {
  358. fd_install(fd, newfile);
  359. return fd;
  360. }
  361. put_unused_fd(fd);
  362. return PTR_ERR(newfile);
  363. }
  364. struct socket *sock_from_file(struct file *file, int *err)
  365. {
  366. if (file->f_op == &socket_file_ops)
  367. return file->private_data; /* set in sock_map_fd */
  368. *err = -ENOTSOCK;
  369. return NULL;
  370. }
  371. EXPORT_SYMBOL(sock_from_file);
  372. /**
  373. * sockfd_lookup - Go from a file number to its socket slot
  374. * @fd: file handle
  375. * @err: pointer to an error code return
  376. *
  377. * The file handle passed in is locked and the socket it is bound
  378. * too is returned. If an error occurs the err pointer is overwritten
  379. * with a negative errno code and NULL is returned. The function checks
  380. * for both invalid handles and passing a handle which is not a socket.
  381. *
  382. * On a success the socket object pointer is returned.
  383. */
  384. struct socket *sockfd_lookup(int fd, int *err)
  385. {
  386. struct file *file;
  387. struct socket *sock;
  388. file = fget(fd);
  389. if (!file) {
  390. *err = -EBADF;
  391. return NULL;
  392. }
  393. sock = sock_from_file(file, err);
  394. if (!sock)
  395. fput(file);
  396. return sock;
  397. }
  398. EXPORT_SYMBOL(sockfd_lookup);
  399. static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
  400. {
  401. struct file *file;
  402. struct socket *sock;
  403. *err = -EBADF;
  404. file = fget_light(fd, fput_needed);
  405. if (file) {
  406. sock = sock_from_file(file, err);
  407. if (sock)
  408. return sock;
  409. fput_light(file, *fput_needed);
  410. }
  411. return NULL;
  412. }
  413. #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
  414. #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
  415. #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
  416. static ssize_t sockfs_getxattr(struct dentry *dentry,
  417. const char *name, void *value, size_t size)
  418. {
  419. const char *proto_name;
  420. size_t proto_size;
  421. int error;
  422. error = -ENODATA;
  423. if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
  424. proto_name = dentry->d_name.name;
  425. proto_size = strlen(proto_name);
  426. if (value) {
  427. error = -ERANGE;
  428. if (proto_size + 1 > size)
  429. goto out;
  430. strncpy(value, proto_name, proto_size + 1);
  431. }
  432. error = proto_size + 1;
  433. }
  434. out:
  435. return error;
  436. }
  437. static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
  438. size_t size)
  439. {
  440. ssize_t len;
  441. ssize_t used = 0;
  442. len = security_inode_listsecurity(dentry->d_inode, buffer, size);
  443. if (len < 0)
  444. return len;
  445. used += len;
  446. if (buffer) {
  447. if (size < used)
  448. return -ERANGE;
  449. buffer += len;
  450. }
  451. len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
  452. used += len;
  453. if (buffer) {
  454. if (size < used)
  455. return -ERANGE;
  456. memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
  457. buffer += len;
  458. }
  459. return used;
  460. }
  461. static const struct inode_operations sockfs_inode_ops = {
  462. .getxattr = sockfs_getxattr,
  463. .listxattr = sockfs_listxattr,
  464. };
  465. /**
  466. * sock_alloc - allocate a socket
  467. *
  468. * Allocate a new inode and socket object. The two are bound together
  469. * and initialised. The socket is then returned. If we are out of inodes
  470. * NULL is returned.
  471. */
  472. static struct socket *sock_alloc(void)
  473. {
  474. struct inode *inode;
  475. struct socket *sock;
  476. inode = new_inode_pseudo(sock_mnt->mnt_sb);
  477. if (!inode)
  478. return NULL;
  479. sock = SOCKET_I(inode);
  480. kmemcheck_annotate_bitfield(sock, type);
  481. inode->i_ino = get_next_ino();
  482. inode->i_mode = S_IFSOCK | S_IRWXUGO;
  483. inode->i_uid = current_fsuid();
  484. inode->i_gid = current_fsgid();
  485. inode->i_op = &sockfs_inode_ops;
  486. this_cpu_add(sockets_in_use, 1);
  487. return sock;
  488. }
  489. /*
  490. * In theory you can't get an open on this inode, but /proc provides
  491. * a back door. Remember to keep it shut otherwise you'll let the
  492. * creepy crawlies in.
  493. */
  494. static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
  495. {
  496. return -ENXIO;
  497. }
  498. const struct file_operations bad_sock_fops = {
  499. .owner = THIS_MODULE,
  500. .open = sock_no_open,
  501. .llseek = noop_llseek,
  502. };
  503. /**
  504. * sock_release - close a socket
  505. * @sock: socket to close
  506. *
  507. * The socket is released from the protocol stack if it has a release
  508. * callback, and the inode is then released if the socket is bound to
  509. * an inode not a file.
  510. */
  511. void sock_release(struct socket *sock)
  512. {
  513. if (sock->ops) {
  514. struct module *owner = sock->ops->owner;
  515. sock->ops->release(sock);
  516. sock->ops = NULL;
  517. module_put(owner);
  518. }
  519. if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
  520. printk(KERN_ERR "sock_release: fasync list not empty!\n");
  521. if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
  522. return;
  523. this_cpu_sub(sockets_in_use, 1);
  524. if (!sock->file) {
  525. iput(SOCK_INODE(sock));
  526. return;
  527. }
  528. sock->file = NULL;
  529. }
  530. EXPORT_SYMBOL(sock_release);
  531. void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
  532. {
  533. *tx_flags = 0;
  534. if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
  535. *tx_flags |= SKBTX_HW_TSTAMP;
  536. if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
  537. *tx_flags |= SKBTX_SW_TSTAMP;
  538. if (sock_flag(sk, SOCK_WIFI_STATUS))
  539. *tx_flags |= SKBTX_WIFI_STATUS;
  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. si->sock = sock;
  547. si->scm = NULL;
  548. si->msg = msg;
  549. si->size = size;
  550. return sock->ops->sendmsg(iocb, sock, msg, size);
  551. }
  552. static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
  553. struct msghdr *msg, size_t size)
  554. {
  555. int err = security_socket_sendmsg(sock, msg, size);
  556. return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
  557. }
  558. int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
  559. {
  560. struct kiocb iocb;
  561. struct sock_iocb siocb;
  562. int ret;
  563. init_sync_kiocb(&iocb, NULL);
  564. iocb.private = &siocb;
  565. ret = __sock_sendmsg(&iocb, sock, msg, size);
  566. if (-EIOCBQUEUED == ret)
  567. ret = wait_on_sync_kiocb(&iocb);
  568. return ret;
  569. }
  570. EXPORT_SYMBOL(sock_sendmsg);
  571. static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
  572. {
  573. struct kiocb iocb;
  574. struct sock_iocb siocb;
  575. int ret;
  576. init_sync_kiocb(&iocb, NULL);
  577. iocb.private = &siocb;
  578. ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
  579. if (-EIOCBQUEUED == ret)
  580. ret = wait_on_sync_kiocb(&iocb);
  581. return ret;
  582. }
  583. int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
  584. struct kvec *vec, size_t num, size_t size)
  585. {
  586. mm_segment_t oldfs = get_fs();
  587. int result;
  588. set_fs(KERNEL_DS);
  589. /*
  590. * the following is safe, since for compiler definitions of kvec and
  591. * iovec are identical, yielding the same in-core layout and alignment
  592. */
  593. msg->msg_iov = (struct iovec *)vec;
  594. msg->msg_iovlen = num;
  595. result = sock_sendmsg(sock, msg, size);
  596. set_fs(oldfs);
  597. return result;
  598. }
  599. EXPORT_SYMBOL(kernel_sendmsg);
  600. /*
  601. * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
  602. */
  603. void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
  604. struct sk_buff *skb)
  605. {
  606. int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
  607. struct timespec ts[3];
  608. int empty = 1;
  609. struct skb_shared_hwtstamps *shhwtstamps =
  610. skb_hwtstamps(skb);
  611. /* Race occurred between timestamp enabling and packet
  612. receiving. Fill in the current time for now. */
  613. if (need_software_tstamp && skb->tstamp.tv64 == 0)
  614. __net_timestamp(skb);
  615. if (need_software_tstamp) {
  616. if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
  617. struct timeval tv;
  618. skb_get_timestamp(skb, &tv);
  619. put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
  620. sizeof(tv), &tv);
  621. } else {
  622. skb_get_timestampns(skb, &ts[0]);
  623. put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
  624. sizeof(ts[0]), &ts[0]);
  625. }
  626. }
  627. memset(ts, 0, sizeof(ts));
  628. if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
  629. ktime_to_timespec_cond(skb->tstamp, ts + 0))
  630. empty = 0;
  631. if (shhwtstamps) {
  632. if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
  633. ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1))
  634. empty = 0;
  635. if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
  636. ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
  637. empty = 0;
  638. }
  639. if (!empty)
  640. put_cmsg(msg, SOL_SOCKET,
  641. SCM_TIMESTAMPING, sizeof(ts), &ts);
  642. }
  643. EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
  644. void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
  645. struct sk_buff *skb)
  646. {
  647. int ack;
  648. if (!sock_flag(sk, SOCK_WIFI_STATUS))
  649. return;
  650. if (!skb->wifi_acked_valid)
  651. return;
  652. ack = skb->wifi_acked;
  653. put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
  654. }
  655. EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
  656. static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
  657. struct sk_buff *skb)
  658. {
  659. if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
  660. put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
  661. sizeof(__u32), &skb->dropcount);
  662. }
  663. void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
  664. struct sk_buff *skb)
  665. {
  666. sock_recv_timestamp(msg, sk, skb);
  667. sock_recv_drops(msg, sk, skb);
  668. }
  669. EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
  670. static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
  671. struct msghdr *msg, size_t size, int flags)
  672. {
  673. struct sock_iocb *si = kiocb_to_siocb(iocb);
  674. si->sock = sock;
  675. si->scm = NULL;
  676. si->msg = msg;
  677. si->size = size;
  678. si->flags = flags;
  679. return sock->ops->recvmsg(iocb, sock, msg, size, flags);
  680. }
  681. static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
  682. struct msghdr *msg, size_t size, int flags)
  683. {
  684. int err = security_socket_recvmsg(sock, msg, size, flags);
  685. return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
  686. }
  687. int sock_recvmsg(struct socket *sock, struct msghdr *msg,
  688. size_t size, int flags)
  689. {
  690. struct kiocb iocb;
  691. struct sock_iocb siocb;
  692. int ret;
  693. init_sync_kiocb(&iocb, NULL);
  694. iocb.private = &siocb;
  695. ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
  696. if (-EIOCBQUEUED == ret)
  697. ret = wait_on_sync_kiocb(&iocb);
  698. return ret;
  699. }
  700. EXPORT_SYMBOL(sock_recvmsg);
  701. static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
  702. size_t size, int flags)
  703. {
  704. struct kiocb iocb;
  705. struct sock_iocb siocb;
  706. int ret;
  707. init_sync_kiocb(&iocb, NULL);
  708. iocb.private = &siocb;
  709. ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
  710. if (-EIOCBQUEUED == ret)
  711. ret = wait_on_sync_kiocb(&iocb);
  712. return ret;
  713. }
  714. /**
  715. * kernel_recvmsg - Receive a message from a socket (kernel space)
  716. * @sock: The socket to receive the message from
  717. * @msg: Received message
  718. * @vec: Input s/g array for message data
  719. * @num: Size of input s/g array
  720. * @size: Number of bytes to read
  721. * @flags: Message flags (MSG_DONTWAIT, etc...)
  722. *
  723. * On return the msg structure contains the scatter/gather array passed in the
  724. * vec argument. The array is modified so that it consists of the unfilled
  725. * portion of the original array.
  726. *
  727. * The returned value is the total number of bytes received, or an error.
  728. */
  729. int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
  730. struct kvec *vec, size_t num, size_t size, int flags)
  731. {
  732. mm_segment_t oldfs = get_fs();
  733. int result;
  734. set_fs(KERNEL_DS);
  735. /*
  736. * the following is safe, since for compiler definitions of kvec and
  737. * iovec are identical, yielding the same in-core layout and alignment
  738. */
  739. msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
  740. result = sock_recvmsg(sock, msg, size, flags);
  741. set_fs(oldfs);
  742. return result;
  743. }
  744. EXPORT_SYMBOL(kernel_recvmsg);
  745. static ssize_t sock_sendpage(struct file *file, struct page *page,
  746. int offset, size_t size, loff_t *ppos, int more)
  747. {
  748. struct socket *sock;
  749. int flags;
  750. sock = file->private_data;
  751. flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
  752. /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
  753. flags |= more;
  754. return kernel_sendpage(sock, page, offset, size, flags);
  755. }
  756. static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
  757. struct pipe_inode_info *pipe, size_t len,
  758. unsigned int flags)
  759. {
  760. struct socket *sock = file->private_data;
  761. if (unlikely(!sock->ops->splice_read))
  762. return -EINVAL;
  763. return sock->ops->splice_read(sock, ppos, pipe, len, flags);
  764. }
  765. static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
  766. struct sock_iocb *siocb)
  767. {
  768. if (!is_sync_kiocb(iocb))
  769. BUG();
  770. siocb->kiocb = iocb;
  771. iocb->private = siocb;
  772. return siocb;
  773. }
  774. static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
  775. struct file *file, const struct iovec *iov,
  776. unsigned long nr_segs)
  777. {
  778. struct socket *sock = file->private_data;
  779. size_t size = 0;
  780. int i;
  781. for (i = 0; i < nr_segs; i++)
  782. size += iov[i].iov_len;
  783. msg->msg_name = NULL;
  784. msg->msg_namelen = 0;
  785. msg->msg_control = NULL;
  786. msg->msg_controllen = 0;
  787. msg->msg_iov = (struct iovec *)iov;
  788. msg->msg_iovlen = nr_segs;
  789. msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
  790. return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
  791. }
  792. static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
  793. unsigned long nr_segs, loff_t pos)
  794. {
  795. struct sock_iocb siocb, *x;
  796. if (pos != 0)
  797. return -ESPIPE;
  798. if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
  799. return 0;
  800. x = alloc_sock_iocb(iocb, &siocb);
  801. if (!x)
  802. return -ENOMEM;
  803. return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
  804. }
  805. static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
  806. struct file *file, const struct iovec *iov,
  807. unsigned long nr_segs)
  808. {
  809. struct socket *sock = file->private_data;
  810. size_t size = 0;
  811. int i;
  812. for (i = 0; i < nr_segs; i++)
  813. size += iov[i].iov_len;
  814. msg->msg_name = NULL;
  815. msg->msg_namelen = 0;
  816. msg->msg_control = NULL;
  817. msg->msg_controllen = 0;
  818. msg->msg_iov = (struct iovec *)iov;
  819. msg->msg_iovlen = nr_segs;
  820. msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
  821. if (sock->type == SOCK_SEQPACKET)
  822. msg->msg_flags |= MSG_EOR;
  823. return __sock_sendmsg(iocb, sock, msg, size);
  824. }
  825. static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
  826. unsigned long nr_segs, loff_t pos)
  827. {
  828. struct sock_iocb siocb, *x;
  829. if (pos != 0)
  830. return -ESPIPE;
  831. x = alloc_sock_iocb(iocb, &siocb);
  832. if (!x)
  833. return -ENOMEM;
  834. return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
  835. }
  836. /*
  837. * Atomic setting of ioctl hooks to avoid race
  838. * with module unload.
  839. */
  840. static DEFINE_MUTEX(br_ioctl_mutex);
  841. static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
  842. void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
  843. {
  844. mutex_lock(&br_ioctl_mutex);
  845. br_ioctl_hook = hook;
  846. mutex_unlock(&br_ioctl_mutex);
  847. }
  848. EXPORT_SYMBOL(brioctl_set);
  849. static DEFINE_MUTEX(vlan_ioctl_mutex);
  850. static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
  851. void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
  852. {
  853. mutex_lock(&vlan_ioctl_mutex);
  854. vlan_ioctl_hook = hook;
  855. mutex_unlock(&vlan_ioctl_mutex);
  856. }
  857. EXPORT_SYMBOL(vlan_ioctl_set);
  858. static DEFINE_MUTEX(dlci_ioctl_mutex);
  859. static int (*dlci_ioctl_hook) (unsigned int, void __user *);
  860. void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
  861. {
  862. mutex_lock(&dlci_ioctl_mutex);
  863. dlci_ioctl_hook = hook;
  864. mutex_unlock(&dlci_ioctl_mutex);
  865. }
  866. EXPORT_SYMBOL(dlci_ioctl_set);
  867. static long sock_do_ioctl(struct net *net, struct socket *sock,
  868. unsigned int cmd, unsigned long arg)
  869. {
  870. int err;
  871. void __user *argp = (void __user *)arg;
  872. err = sock->ops->ioctl(sock, cmd, arg);
  873. /*
  874. * If this ioctl is unknown try to hand it down
  875. * to the NIC driver.
  876. */
  877. if (err == -ENOIOCTLCMD)
  878. err = dev_ioctl(net, cmd, argp);
  879. return err;
  880. }
  881. /*
  882. * With an ioctl, arg may well be a user mode pointer, but we don't know
  883. * what to do with it - that's up to the protocol still.
  884. */
  885. static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
  886. {
  887. struct socket *sock;
  888. struct sock *sk;
  889. void __user *argp = (void __user *)arg;
  890. int pid, err;
  891. struct net *net;
  892. sock = file->private_data;
  893. sk = sock->sk;
  894. net = sock_net(sk);
  895. if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
  896. err = dev_ioctl(net, cmd, argp);
  897. } else
  898. #ifdef CONFIG_WEXT_CORE
  899. if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
  900. err = dev_ioctl(net, cmd, argp);
  901. } else
  902. #endif
  903. switch (cmd) {
  904. case FIOSETOWN:
  905. case SIOCSPGRP:
  906. err = -EFAULT;
  907. if (get_user(pid, (int __user *)argp))
  908. break;
  909. err = f_setown(sock->file, pid, 1);
  910. break;
  911. case FIOGETOWN:
  912. case SIOCGPGRP:
  913. err = put_user(f_getown(sock->file),
  914. (int __user *)argp);
  915. break;
  916. case SIOCGIFBR:
  917. case SIOCSIFBR:
  918. case SIOCBRADDBR:
  919. case SIOCBRDELBR:
  920. err = -ENOPKG;
  921. if (!br_ioctl_hook)
  922. request_module("bridge");
  923. mutex_lock(&br_ioctl_mutex);
  924. if (br_ioctl_hook)
  925. err = br_ioctl_hook(net, cmd, argp);
  926. mutex_unlock(&br_ioctl_mutex);
  927. break;
  928. case SIOCGIFVLAN:
  929. case SIOCSIFVLAN:
  930. err = -ENOPKG;
  931. if (!vlan_ioctl_hook)
  932. request_module("8021q");
  933. mutex_lock(&vlan_ioctl_mutex);
  934. if (vlan_ioctl_hook)
  935. err = vlan_ioctl_hook(net, argp);
  936. mutex_unlock(&vlan_ioctl_mutex);
  937. break;
  938. case SIOCADDDLCI:
  939. case SIOCDELDLCI:
  940. err = -ENOPKG;
  941. if (!dlci_ioctl_hook)
  942. request_module("dlci");
  943. mutex_lock(&dlci_ioctl_mutex);
  944. if (dlci_ioctl_hook)
  945. err = dlci_ioctl_hook(cmd, argp);
  946. mutex_unlock(&dlci_ioctl_mutex);
  947. break;
  948. default:
  949. err = sock_do_ioctl(net, sock, cmd, arg);
  950. break;
  951. }
  952. return err;
  953. }
  954. int sock_create_lite(int family, int type, int protocol, struct socket **res)
  955. {
  956. int err;
  957. struct socket *sock = NULL;
  958. err = security_socket_create(family, type, protocol, 1);
  959. if (err)
  960. goto out;
  961. sock = sock_alloc();
  962. if (!sock) {
  963. err = -ENOMEM;
  964. goto out;
  965. }
  966. sock->type = type;
  967. err = security_socket_post_create(sock, family, type, protocol, 1);
  968. if (err)
  969. goto out_release;
  970. out:
  971. *res = sock;
  972. return err;
  973. out_release:
  974. sock_release(sock);
  975. sock = NULL;
  976. goto out;
  977. }
  978. EXPORT_SYMBOL(sock_create_lite);
  979. /* No kernel lock held - perfect */
  980. static unsigned int sock_poll(struct file *file, poll_table *wait)
  981. {
  982. unsigned int busy_flag = 0;
  983. struct socket *sock;
  984. /*
  985. * We can't return errors to poll, so it's either yes or no.
  986. */
  987. sock = file->private_data;
  988. if (sk_can_busy_loop(sock->sk)) {
  989. /* this socket can poll_ll so tell the system call */
  990. busy_flag = POLL_BUSY_LOOP;
  991. /* once, only if requested by syscall */
  992. if (wait && (wait->_key & POLL_BUSY_LOOP))
  993. sk_busy_loop(sock->sk, 1);
  994. }
  995. return busy_flag | sock->ops->poll(file, sock, wait);
  996. }
  997. static int sock_mmap(struct file *file, struct vm_area_struct *vma)
  998. {
  999. struct socket *sock = file->private_data;
  1000. return sock->ops->mmap(file, sock, vma);
  1001. }
  1002. static int sock_close(struct inode *inode, struct file *filp)
  1003. {
  1004. sock_release(SOCKET_I(inode));
  1005. return 0;
  1006. }
  1007. /*
  1008. * Update the socket async list
  1009. *
  1010. * Fasync_list locking strategy.
  1011. *
  1012. * 1. fasync_list is modified only under process context socket lock
  1013. * i.e. under semaphore.
  1014. * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
  1015. * or under socket lock
  1016. */
  1017. static int sock_fasync(int fd, struct file *filp, int on)
  1018. {
  1019. struct socket *sock = filp->private_data;
  1020. struct sock *sk = sock->sk;
  1021. struct socket_wq *wq;
  1022. if (sk == NULL)
  1023. return -EINVAL;
  1024. lock_sock(sk);
  1025. wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
  1026. fasync_helper(fd, filp, on, &wq->fasync_list);
  1027. if (!wq->fasync_list)
  1028. sock_reset_flag(sk, SOCK_FASYNC);
  1029. else
  1030. sock_set_flag(sk, SOCK_FASYNC);
  1031. release_sock(sk);
  1032. return 0;
  1033. }
  1034. /* This function may be called only under socket lock or callback_lock or rcu_lock */
  1035. int sock_wake_async(struct socket *sock, int how, int band)
  1036. {
  1037. struct socket_wq *wq;
  1038. if (!sock)
  1039. return -1;
  1040. rcu_read_lock();
  1041. wq = rcu_dereference(sock->wq);
  1042. if (!wq || !wq->fasync_list) {
  1043. rcu_read_unlock();
  1044. return -1;
  1045. }
  1046. switch (how) {
  1047. case SOCK_WAKE_WAITD:
  1048. if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
  1049. break;
  1050. goto call_kill;
  1051. case SOCK_WAKE_SPACE:
  1052. if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
  1053. break;
  1054. /* fall through */
  1055. case SOCK_WAKE_IO:
  1056. call_kill:
  1057. kill_fasync(&wq->fasync_list, SIGIO, band);
  1058. break;
  1059. case SOCK_WAKE_URG:
  1060. kill_fasync(&wq->fasync_list, SIGURG, band);
  1061. }
  1062. rcu_read_unlock();
  1063. return 0;
  1064. }
  1065. EXPORT_SYMBOL(sock_wake_async);
  1066. int __sock_create(struct net *net, int family, int type, int protocol,
  1067. struct socket **res, int kern)
  1068. {
  1069. int err;
  1070. struct socket *sock;
  1071. const struct net_proto_family *pf;
  1072. /*
  1073. * Check protocol is in range
  1074. */
  1075. if (family < 0 || family >= NPROTO)
  1076. return -EAFNOSUPPORT;
  1077. if (type < 0 || type >= SOCK_MAX)
  1078. return -EINVAL;
  1079. /* Compatibility.
  1080. This uglymoron is moved from INET layer to here to avoid
  1081. deadlock in module load.
  1082. */
  1083. if (family == PF_INET && type == SOCK_PACKET) {
  1084. static int warned;
  1085. if (!warned) {
  1086. warned = 1;
  1087. printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
  1088. current->comm);
  1089. }
  1090. family = PF_PACKET;
  1091. }
  1092. err = security_socket_create(family, type, protocol, kern);
  1093. if (err)
  1094. return err;
  1095. /*
  1096. * Allocate the socket and allow the family to set things up. if
  1097. * the protocol is 0, the family is instructed to select an appropriate
  1098. * default.
  1099. */
  1100. sock = sock_alloc();
  1101. if (!sock) {
  1102. net_warn_ratelimited("socket: no more sockets\n");
  1103. return -ENFILE; /* Not exactly a match, but its the
  1104. closest posix thing */
  1105. }
  1106. sock->type = type;
  1107. #ifdef CONFIG_MODULES
  1108. /* Attempt to load a protocol module if the find failed.
  1109. *
  1110. * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
  1111. * requested real, full-featured networking support upon configuration.
  1112. * Otherwise module support will break!
  1113. */
  1114. if (rcu_access_pointer(net_families[family]) == NULL)
  1115. request_module("net-pf-%d", family);
  1116. #endif
  1117. rcu_read_lock();
  1118. pf = rcu_dereference(net_families[family]);
  1119. err = -EAFNOSUPPORT;
  1120. if (!pf)
  1121. goto out_release;
  1122. /*
  1123. * We will call the ->create function, that possibly is in a loadable
  1124. * module, so we have to bump that loadable module refcnt first.
  1125. */
  1126. if (!try_module_get(pf->owner))
  1127. goto out_release;
  1128. /* Now protected by module ref count */
  1129. rcu_read_unlock();
  1130. err = pf->create(net, sock, protocol, kern);
  1131. if (err < 0)
  1132. goto out_module_put;
  1133. /*
  1134. * Now to bump the refcnt of the [loadable] module that owns this
  1135. * socket at sock_release time we decrement its refcnt.
  1136. */
  1137. if (!try_module_get(sock->ops->owner))
  1138. goto out_module_busy;
  1139. /*
  1140. * Now that we're done with the ->create function, the [loadable]
  1141. * module can have its refcnt decremented
  1142. */
  1143. module_put(pf->owner);
  1144. err = security_socket_post_create(sock, family, type, protocol, kern);
  1145. if (err)
  1146. goto out_sock_release;
  1147. *res = sock;
  1148. return 0;
  1149. out_module_busy:
  1150. err = -EAFNOSUPPORT;
  1151. out_module_put:
  1152. sock->ops = NULL;
  1153. module_put(pf->owner);
  1154. out_sock_release:
  1155. sock_release(sock);
  1156. return err;
  1157. out_release:
  1158. rcu_read_unlock();
  1159. goto out_sock_release;
  1160. }
  1161. EXPORT_SYMBOL(__sock_create);
  1162. int sock_create(int family, int type, int protocol, struct socket **res)
  1163. {
  1164. return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
  1165. }
  1166. EXPORT_SYMBOL(sock_create);
  1167. int sock_create_kern(int family, int type, int protocol, struct socket **res)
  1168. {
  1169. return __sock_create(&init_net, family, type, protocol, res, 1);
  1170. }
  1171. EXPORT_SYMBOL(sock_create_kern);
  1172. SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
  1173. {
  1174. int retval;
  1175. struct socket *sock;
  1176. int flags;
  1177. /* Check the SOCK_* constants for consistency. */
  1178. BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
  1179. BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
  1180. BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
  1181. BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
  1182. flags = type & ~SOCK_TYPE_MASK;
  1183. if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
  1184. return -EINVAL;
  1185. type &= SOCK_TYPE_MASK;
  1186. if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
  1187. flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
  1188. retval = sock_create(family, type, protocol, &sock);
  1189. if (retval < 0)
  1190. goto out;
  1191. retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
  1192. if (retval < 0)
  1193. goto out_release;
  1194. out:
  1195. /* It may be already another descriptor 8) Not kernel problem. */
  1196. return retval;
  1197. out_release:
  1198. sock_release(sock);
  1199. return retval;
  1200. }
  1201. /*
  1202. * Create a pair of connected sockets.
  1203. */
  1204. SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
  1205. int __user *, usockvec)
  1206. {
  1207. struct socket *sock1, *sock2;
  1208. int fd1, fd2, err;
  1209. struct file *newfile1, *newfile2;
  1210. int flags;
  1211. flags = type & ~SOCK_TYPE_MASK;
  1212. if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
  1213. return -EINVAL;
  1214. type &= SOCK_TYPE_MASK;
  1215. if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
  1216. flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
  1217. /*
  1218. * Obtain the first socket and check if the underlying protocol
  1219. * supports the socketpair call.
  1220. */
  1221. err = sock_create(family, type, protocol, &sock1);
  1222. if (err < 0)
  1223. goto out;
  1224. err = sock_create(family, type, protocol, &sock2);
  1225. if (err < 0)
  1226. goto out_release_1;
  1227. err = sock1->ops->socketpair(sock1, sock2);
  1228. if (err < 0)
  1229. goto out_release_both;
  1230. fd1 = get_unused_fd_flags(flags);
  1231. if (unlikely(fd1 < 0)) {
  1232. err = fd1;
  1233. goto out_release_both;
  1234. }
  1235. fd2 = get_unused_fd_flags(flags);
  1236. if (unlikely(fd2 < 0)) {
  1237. err = fd2;
  1238. put_unused_fd(fd1);
  1239. goto out_release_both;
  1240. }
  1241. newfile1 = sock_alloc_file(sock1, flags, NULL);
  1242. if (unlikely(IS_ERR(newfile1))) {
  1243. err = PTR_ERR(newfile1);
  1244. put_unused_fd(fd1);
  1245. put_unused_fd(fd2);
  1246. goto out_release_both;
  1247. }
  1248. newfile2 = sock_alloc_file(sock2, flags, NULL);
  1249. if (IS_ERR(newfile2)) {
  1250. err = PTR_ERR(newfile2);
  1251. fput(newfile1);
  1252. put_unused_fd(fd1);
  1253. put_unused_fd(fd2);
  1254. sock_release(sock2);
  1255. goto out;
  1256. }
  1257. audit_fd_pair(fd1, fd2);
  1258. fd_install(fd1, newfile1);
  1259. fd_install(fd2, newfile2);
  1260. /* fd1 and fd2 may be already another descriptors.
  1261. * Not kernel problem.
  1262. */
  1263. err = put_user(fd1, &usockvec[0]);
  1264. if (!err)
  1265. err = put_user(fd2, &usockvec[1]);
  1266. if (!err)
  1267. return 0;
  1268. sys_close(fd2);
  1269. sys_close(fd1);
  1270. return err;
  1271. out_release_both:
  1272. sock_release(sock2);
  1273. out_release_1:
  1274. sock_release(sock1);
  1275. out:
  1276. return err;
  1277. }
  1278. /*
  1279. * Bind a name to a socket. Nothing much to do here since it's
  1280. * the protocol's responsibility to handle the local address.
  1281. *
  1282. * We move the socket address to kernel space before we call
  1283. * the protocol layer (having also checked the address is ok).
  1284. */
  1285. SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
  1286. {
  1287. struct socket *sock;
  1288. struct sockaddr_storage address;
  1289. int err, fput_needed;
  1290. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1291. if (sock) {
  1292. err = move_addr_to_kernel(umyaddr, addrlen, &address);
  1293. if (err >= 0) {
  1294. err = security_socket_bind(sock,
  1295. (struct sockaddr *)&address,
  1296. addrlen);
  1297. if (!err)
  1298. err = sock->ops->bind(sock,
  1299. (struct sockaddr *)
  1300. &address, addrlen);
  1301. }
  1302. fput_light(sock->file, fput_needed);
  1303. }
  1304. return err;
  1305. }
  1306. /*
  1307. * Perform a listen. Basically, we allow the protocol to do anything
  1308. * necessary for a listen, and if that works, we mark the socket as
  1309. * ready for listening.
  1310. */
  1311. SYSCALL_DEFINE2(listen, int, fd, int, backlog)
  1312. {
  1313. struct socket *sock;
  1314. int err, fput_needed;
  1315. int somaxconn;
  1316. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1317. if (sock) {
  1318. somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
  1319. if ((unsigned int)backlog > somaxconn)
  1320. backlog = somaxconn;
  1321. err = security_socket_listen(sock, backlog);
  1322. if (!err)
  1323. err = sock->ops->listen(sock, backlog);
  1324. fput_light(sock->file, fput_needed);
  1325. }
  1326. return err;
  1327. }
  1328. /*
  1329. * For accept, we attempt to create a new socket, set up the link
  1330. * with the client, wake up the client, then return the new
  1331. * connected fd. We collect the address of the connector in kernel
  1332. * space and move it to user at the very end. This is unclean because
  1333. * we open the socket then return an error.
  1334. *
  1335. * 1003.1g adds the ability to recvmsg() to query connection pending
  1336. * status to recvmsg. We need to add that support in a way thats
  1337. * clean when we restucture accept also.
  1338. */
  1339. SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
  1340. int __user *, upeer_addrlen, int, flags)
  1341. {
  1342. struct socket *sock, *newsock;
  1343. struct file *newfile;
  1344. int err, len, newfd, fput_needed;
  1345. struct sockaddr_storage address;
  1346. if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
  1347. return -EINVAL;
  1348. if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
  1349. flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
  1350. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1351. if (!sock)
  1352. goto out;
  1353. err = -ENFILE;
  1354. newsock = sock_alloc();
  1355. if (!newsock)
  1356. goto out_put;
  1357. newsock->type = sock->type;
  1358. newsock->ops = sock->ops;
  1359. /*
  1360. * We don't need try_module_get here, as the listening socket (sock)
  1361. * has the protocol module (sock->ops->owner) held.
  1362. */
  1363. __module_get(newsock->ops->owner);
  1364. newfd = get_unused_fd_flags(flags);
  1365. if (unlikely(newfd < 0)) {
  1366. err = newfd;
  1367. sock_release(newsock);
  1368. goto out_put;
  1369. }
  1370. newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
  1371. if (unlikely(IS_ERR(newfile))) {
  1372. err = PTR_ERR(newfile);
  1373. put_unused_fd(newfd);
  1374. sock_release(newsock);
  1375. goto out_put;
  1376. }
  1377. err = security_socket_accept(sock, newsock);
  1378. if (err)
  1379. goto out_fd;
  1380. err = sock->ops->accept(sock, newsock, sock->file->f_flags);
  1381. if (err < 0)
  1382. goto out_fd;
  1383. if (upeer_sockaddr) {
  1384. if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
  1385. &len, 2) < 0) {
  1386. err = -ECONNABORTED;
  1387. goto out_fd;
  1388. }
  1389. err = move_addr_to_user(&address,
  1390. len, upeer_sockaddr, upeer_addrlen);
  1391. if (err < 0)
  1392. goto out_fd;
  1393. }
  1394. /* File flags are not inherited via accept() unlike another OSes. */
  1395. fd_install(newfd, newfile);
  1396. err = newfd;
  1397. out_put:
  1398. fput_light(sock->file, fput_needed);
  1399. out:
  1400. return err;
  1401. out_fd:
  1402. fput(newfile);
  1403. put_unused_fd(newfd);
  1404. goto out_put;
  1405. }
  1406. SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
  1407. int __user *, upeer_addrlen)
  1408. {
  1409. return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
  1410. }
  1411. /*
  1412. * Attempt to connect to a socket with the server address. The address
  1413. * is in user space so we verify it is OK and move it to kernel space.
  1414. *
  1415. * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
  1416. * break bindings
  1417. *
  1418. * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
  1419. * other SEQPACKET protocols that take time to connect() as it doesn't
  1420. * include the -EINPROGRESS status for such sockets.
  1421. */
  1422. SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
  1423. int, addrlen)
  1424. {
  1425. struct socket *sock;
  1426. struct sockaddr_storage address;
  1427. int err, fput_needed;
  1428. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1429. if (!sock)
  1430. goto out;
  1431. err = move_addr_to_kernel(uservaddr, addrlen, &address);
  1432. if (err < 0)
  1433. goto out_put;
  1434. err =
  1435. security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
  1436. if (err)
  1437. goto out_put;
  1438. err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
  1439. sock->file->f_flags);
  1440. out_put:
  1441. fput_light(sock->file, fput_needed);
  1442. out:
  1443. return err;
  1444. }
  1445. /*
  1446. * Get the local address ('name') of a socket object. Move the obtained
  1447. * name to user space.
  1448. */
  1449. SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
  1450. int __user *, usockaddr_len)
  1451. {
  1452. struct socket *sock;
  1453. struct sockaddr_storage address;
  1454. int len, err, fput_needed;
  1455. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1456. if (!sock)
  1457. goto out;
  1458. err = security_socket_getsockname(sock);
  1459. if (err)
  1460. goto out_put;
  1461. err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
  1462. if (err)
  1463. goto out_put;
  1464. err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
  1465. out_put:
  1466. fput_light(sock->file, fput_needed);
  1467. out:
  1468. return err;
  1469. }
  1470. /*
  1471. * Get the remote address ('name') of a socket object. Move the obtained
  1472. * name to user space.
  1473. */
  1474. SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
  1475. int __user *, usockaddr_len)
  1476. {
  1477. struct socket *sock;
  1478. struct sockaddr_storage address;
  1479. int len, err, fput_needed;
  1480. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1481. if (sock != NULL) {
  1482. err = security_socket_getpeername(sock);
  1483. if (err) {
  1484. fput_light(sock->file, fput_needed);
  1485. return err;
  1486. }
  1487. err =
  1488. sock->ops->getname(sock, (struct sockaddr *)&address, &len,
  1489. 1);
  1490. if (!err)
  1491. err = move_addr_to_user(&address, len, usockaddr,
  1492. usockaddr_len);
  1493. fput_light(sock->file, fput_needed);
  1494. }
  1495. return err;
  1496. }
  1497. /*
  1498. * Send a datagram to a given address. We move the address into kernel
  1499. * space and check the user space data area is readable before invoking
  1500. * the protocol.
  1501. */
  1502. SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
  1503. unsigned int, flags, struct sockaddr __user *, addr,
  1504. int, addr_len)
  1505. {
  1506. struct socket *sock;
  1507. struct sockaddr_storage address;
  1508. int err;
  1509. struct msghdr msg;
  1510. struct iovec iov;
  1511. int fput_needed;
  1512. if (len > INT_MAX)
  1513. len = INT_MAX;
  1514. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1515. if (!sock)
  1516. goto out;
  1517. iov.iov_base = buff;
  1518. iov.iov_len = len;
  1519. msg.msg_name = NULL;
  1520. msg.msg_iov = &iov;
  1521. msg.msg_iovlen = 1;
  1522. msg.msg_control = NULL;
  1523. msg.msg_controllen = 0;
  1524. msg.msg_namelen = 0;
  1525. if (addr) {
  1526. err = move_addr_to_kernel(addr, addr_len, &address);
  1527. if (err < 0)
  1528. goto out_put;
  1529. msg.msg_name = (struct sockaddr *)&address;
  1530. msg.msg_namelen = addr_len;
  1531. }
  1532. if (sock->file->f_flags & O_NONBLOCK)
  1533. flags |= MSG_DONTWAIT;
  1534. msg.msg_flags = flags;
  1535. err = sock_sendmsg(sock, &msg, len);
  1536. out_put:
  1537. fput_light(sock->file, fput_needed);
  1538. out:
  1539. return err;
  1540. }
  1541. /*
  1542. * Send a datagram down a socket.
  1543. */
  1544. SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
  1545. unsigned int, flags)
  1546. {
  1547. return sys_sendto(fd, buff, len, flags, NULL, 0);
  1548. }
  1549. /*
  1550. * Receive a frame from the socket and optionally record the address of the
  1551. * sender. We verify the buffers are writable and if needed move the
  1552. * sender address from kernel to user space.
  1553. */
  1554. SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
  1555. unsigned int, flags, struct sockaddr __user *, addr,
  1556. int __user *, addr_len)
  1557. {
  1558. struct socket *sock;
  1559. struct iovec iov;
  1560. struct msghdr msg;
  1561. struct sockaddr_storage address;
  1562. int err, err2;
  1563. int fput_needed;
  1564. if (size > INT_MAX)
  1565. size = INT_MAX;
  1566. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1567. if (!sock)
  1568. goto out;
  1569. msg.msg_control = NULL;
  1570. msg.msg_controllen = 0;
  1571. msg.msg_iovlen = 1;
  1572. msg.msg_iov = &iov;
  1573. iov.iov_len = size;
  1574. iov.iov_base = ubuf;
  1575. /* Save some cycles and don't copy the address if not needed */
  1576. msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
  1577. /* We assume all kernel code knows the size of sockaddr_storage */
  1578. msg.msg_namelen = 0;
  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 copy_msghdr_from_user(struct msghdr *kmsg,
  1683. struct msghdr __user *umsg)
  1684. {
  1685. if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
  1686. return -EFAULT;
  1687. if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  1688. return -EINVAL;
  1689. return 0;
  1690. }
  1691. static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
  1692. struct msghdr *msg_sys, unsigned int flags,
  1693. struct used_address *used_address)
  1694. {
  1695. struct compat_msghdr __user *msg_compat =
  1696. (struct compat_msghdr __user *)msg;
  1697. struct sockaddr_storage address;
  1698. struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
  1699. unsigned char ctl[sizeof(struct cmsghdr) + 20]
  1700. __attribute__ ((aligned(sizeof(__kernel_size_t))));
  1701. /* 20 is size of ipv6_pktinfo */
  1702. unsigned char *ctl_buf = ctl;
  1703. int err, ctl_len, total_len;
  1704. err = -EFAULT;
  1705. if (MSG_CMSG_COMPAT & flags) {
  1706. if (get_compat_msghdr(msg_sys, msg_compat))
  1707. return -EFAULT;
  1708. } else {
  1709. err = copy_msghdr_from_user(msg_sys, msg);
  1710. if (err)
  1711. return err;
  1712. }
  1713. if (msg_sys->msg_iovlen > UIO_FASTIOV) {
  1714. err = -EMSGSIZE;
  1715. if (msg_sys->msg_iovlen > UIO_MAXIOV)
  1716. goto out;
  1717. err = -ENOMEM;
  1718. iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
  1719. GFP_KERNEL);
  1720. if (!iov)
  1721. goto out;
  1722. }
  1723. /* This will also move the address data into kernel space */
  1724. if (MSG_CMSG_COMPAT & flags) {
  1725. err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
  1726. } else
  1727. err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
  1728. if (err < 0)
  1729. goto out_freeiov;
  1730. total_len = err;
  1731. err = -ENOBUFS;
  1732. if (msg_sys->msg_controllen > INT_MAX)
  1733. goto out_freeiov;
  1734. ctl_len = msg_sys->msg_controllen;
  1735. if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
  1736. err =
  1737. cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
  1738. sizeof(ctl));
  1739. if (err)
  1740. goto out_freeiov;
  1741. ctl_buf = msg_sys->msg_control;
  1742. ctl_len = msg_sys->msg_controllen;
  1743. } else if (ctl_len) {
  1744. if (ctl_len > sizeof(ctl)) {
  1745. ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
  1746. if (ctl_buf == NULL)
  1747. goto out_freeiov;
  1748. }
  1749. err = -EFAULT;
  1750. /*
  1751. * Careful! Before this, msg_sys->msg_control contains a user pointer.
  1752. * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
  1753. * checking falls down on this.
  1754. */
  1755. if (copy_from_user(ctl_buf,
  1756. (void __user __force *)msg_sys->msg_control,
  1757. ctl_len))
  1758. goto out_freectl;
  1759. msg_sys->msg_control = ctl_buf;
  1760. }
  1761. msg_sys->msg_flags = flags;
  1762. if (sock->file->f_flags & O_NONBLOCK)
  1763. msg_sys->msg_flags |= MSG_DONTWAIT;
  1764. /*
  1765. * If this is sendmmsg() and current destination address is same as
  1766. * previously succeeded address, omit asking LSM's decision.
  1767. * used_address->name_len is initialized to UINT_MAX so that the first
  1768. * destination address never matches.
  1769. */
  1770. if (used_address && msg_sys->msg_name &&
  1771. used_address->name_len == msg_sys->msg_namelen &&
  1772. !memcmp(&used_address->name, msg_sys->msg_name,
  1773. used_address->name_len)) {
  1774. err = sock_sendmsg_nosec(sock, msg_sys, total_len);
  1775. goto out_freectl;
  1776. }
  1777. err = sock_sendmsg(sock, msg_sys, total_len);
  1778. /*
  1779. * If this is sendmmsg() and sending to current destination address was
  1780. * successful, remember it.
  1781. */
  1782. if (used_address && err >= 0) {
  1783. used_address->name_len = msg_sys->msg_namelen;
  1784. if (msg_sys->msg_name)
  1785. memcpy(&used_address->name, msg_sys->msg_name,
  1786. used_address->name_len);
  1787. }
  1788. out_freectl:
  1789. if (ctl_buf != ctl)
  1790. sock_kfree_s(sock->sk, ctl_buf, ctl_len);
  1791. out_freeiov:
  1792. if (iov != iovstack)
  1793. kfree(iov);
  1794. out:
  1795. return err;
  1796. }
  1797. /*
  1798. * BSD sendmsg interface
  1799. */
  1800. long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
  1801. {
  1802. int fput_needed, err;
  1803. struct msghdr msg_sys;
  1804. struct socket *sock;
  1805. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1806. if (!sock)
  1807. goto out;
  1808. err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
  1809. fput_light(sock->file, fput_needed);
  1810. out:
  1811. return err;
  1812. }
  1813. SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
  1814. {
  1815. if (flags & MSG_CMSG_COMPAT)
  1816. return -EINVAL;
  1817. return __sys_sendmsg(fd, msg, flags);
  1818. }
  1819. /*
  1820. * Linux sendmmsg interface
  1821. */
  1822. int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
  1823. unsigned int flags)
  1824. {
  1825. int fput_needed, err, datagrams;
  1826. struct socket *sock;
  1827. struct mmsghdr __user *entry;
  1828. struct compat_mmsghdr __user *compat_entry;
  1829. struct msghdr msg_sys;
  1830. struct used_address used_address;
  1831. if (vlen > UIO_MAXIOV)
  1832. vlen = UIO_MAXIOV;
  1833. datagrams = 0;
  1834. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1835. if (!sock)
  1836. return err;
  1837. used_address.name_len = UINT_MAX;
  1838. entry = mmsg;
  1839. compat_entry = (struct compat_mmsghdr __user *)mmsg;
  1840. err = 0;
  1841. while (datagrams < vlen) {
  1842. if (MSG_CMSG_COMPAT & flags) {
  1843. err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
  1844. &msg_sys, flags, &used_address);
  1845. if (err < 0)
  1846. break;
  1847. err = __put_user(err, &compat_entry->msg_len);
  1848. ++compat_entry;
  1849. } else {
  1850. err = ___sys_sendmsg(sock,
  1851. (struct msghdr __user *)entry,
  1852. &msg_sys, flags, &used_address);
  1853. if (err < 0)
  1854. break;
  1855. err = put_user(err, &entry->msg_len);
  1856. ++entry;
  1857. }
  1858. if (err)
  1859. break;
  1860. ++datagrams;
  1861. }
  1862. fput_light(sock->file, fput_needed);
  1863. /* We only return an error if no datagrams were able to be sent */
  1864. if (datagrams != 0)
  1865. return datagrams;
  1866. return err;
  1867. }
  1868. SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
  1869. unsigned int, vlen, unsigned int, flags)
  1870. {
  1871. if (flags & MSG_CMSG_COMPAT)
  1872. return -EINVAL;
  1873. return __sys_sendmmsg(fd, mmsg, vlen, flags);
  1874. }
  1875. static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
  1876. struct msghdr *msg_sys, unsigned int flags, int nosec)
  1877. {
  1878. struct compat_msghdr __user *msg_compat =
  1879. (struct compat_msghdr __user *)msg;
  1880. struct iovec iovstack[UIO_FASTIOV];
  1881. struct iovec *iov = iovstack;
  1882. unsigned long cmsg_ptr;
  1883. int err, total_len, len;
  1884. /* kernel mode address */
  1885. struct sockaddr_storage addr;
  1886. /* user mode address pointers */
  1887. struct sockaddr __user *uaddr;
  1888. int __user *uaddr_len;
  1889. if (MSG_CMSG_COMPAT & flags) {
  1890. if (get_compat_msghdr(msg_sys, msg_compat))
  1891. return -EFAULT;
  1892. } else {
  1893. err = copy_msghdr_from_user(msg_sys, msg);
  1894. if (err)
  1895. return err;
  1896. }
  1897. if (msg_sys->msg_iovlen > UIO_FASTIOV) {
  1898. err = -EMSGSIZE;
  1899. if (msg_sys->msg_iovlen > UIO_MAXIOV)
  1900. goto out;
  1901. err = -ENOMEM;
  1902. iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
  1903. GFP_KERNEL);
  1904. if (!iov)
  1905. goto out;
  1906. }
  1907. /* Save the user-mode address (verify_iovec will change the
  1908. * kernel msghdr to use the kernel address space)
  1909. */
  1910. uaddr = (__force void __user *)msg_sys->msg_name;
  1911. uaddr_len = COMPAT_NAMELEN(msg);
  1912. if (MSG_CMSG_COMPAT & flags)
  1913. err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
  1914. else
  1915. err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
  1916. if (err < 0)
  1917. goto out_freeiov;
  1918. total_len = err;
  1919. cmsg_ptr = (unsigned long)msg_sys->msg_control;
  1920. msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
  1921. /* We assume all kernel code knows the size of sockaddr_storage */
  1922. msg_sys->msg_namelen = 0;
  1923. if (sock->file->f_flags & O_NONBLOCK)
  1924. flags |= MSG_DONTWAIT;
  1925. err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
  1926. total_len, flags);
  1927. if (err < 0)
  1928. goto out_freeiov;
  1929. len = err;
  1930. if (uaddr != NULL) {
  1931. err = move_addr_to_user(&addr,
  1932. msg_sys->msg_namelen, uaddr,
  1933. uaddr_len);
  1934. if (err < 0)
  1935. goto out_freeiov;
  1936. }
  1937. err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
  1938. COMPAT_FLAGS(msg));
  1939. if (err)
  1940. goto out_freeiov;
  1941. if (MSG_CMSG_COMPAT & flags)
  1942. err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
  1943. &msg_compat->msg_controllen);
  1944. else
  1945. err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
  1946. &msg->msg_controllen);
  1947. if (err)
  1948. goto out_freeiov;
  1949. err = len;
  1950. out_freeiov:
  1951. if (iov != iovstack)
  1952. kfree(iov);
  1953. out:
  1954. return err;
  1955. }
  1956. /*
  1957. * BSD recvmsg interface
  1958. */
  1959. long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
  1960. {
  1961. int fput_needed, err;
  1962. struct msghdr msg_sys;
  1963. struct socket *sock;
  1964. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1965. if (!sock)
  1966. goto out;
  1967. err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
  1968. fput_light(sock->file, fput_needed);
  1969. out:
  1970. return err;
  1971. }
  1972. SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
  1973. unsigned int, flags)
  1974. {
  1975. if (flags & MSG_CMSG_COMPAT)
  1976. return -EINVAL;
  1977. return __sys_recvmsg(fd, msg, flags);
  1978. }
  1979. /*
  1980. * Linux recvmmsg interface
  1981. */
  1982. int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
  1983. unsigned int flags, struct timespec *timeout)
  1984. {
  1985. int fput_needed, err, datagrams;
  1986. struct socket *sock;
  1987. struct mmsghdr __user *entry;
  1988. struct compat_mmsghdr __user *compat_entry;
  1989. struct msghdr msg_sys;
  1990. struct timespec end_time;
  1991. if (timeout &&
  1992. poll_select_set_timeout(&end_time, timeout->tv_sec,
  1993. timeout->tv_nsec))
  1994. return -EINVAL;
  1995. datagrams = 0;
  1996. sock = sockfd_lookup_light(fd, &err, &fput_needed);
  1997. if (!sock)
  1998. return err;
  1999. err = sock_error(sock->sk);
  2000. if (err)
  2001. goto out_put;
  2002. entry = mmsg;
  2003. compat_entry = (struct compat_mmsghdr __user *)mmsg;
  2004. while (datagrams < vlen) {
  2005. /*
  2006. * No need to ask LSM for more than the first datagram.
  2007. */
  2008. if (MSG_CMSG_COMPAT & flags) {
  2009. err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
  2010. &msg_sys, flags & ~MSG_WAITFORONE,
  2011. datagrams);
  2012. if (err < 0)
  2013. break;
  2014. err = __put_user(err, &compat_entry->msg_len);
  2015. ++compat_entry;
  2016. } else {
  2017. err = ___sys_recvmsg(sock,
  2018. (struct msghdr __user *)entry,
  2019. &msg_sys, flags & ~MSG_WAITFORONE,
  2020. datagrams);
  2021. if (err < 0)
  2022. break;
  2023. err = put_user(err, &entry->msg_len);
  2024. ++entry;
  2025. }
  2026. if (err)
  2027. break;
  2028. ++datagrams;
  2029. /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
  2030. if (flags & MSG_WAITFORONE)
  2031. flags |= MSG_DONTWAIT;
  2032. if (timeout) {
  2033. ktime_get_ts(timeout);
  2034. *timeout = timespec_sub(end_time, *timeout);
  2035. if (timeout->tv_sec < 0) {
  2036. timeout->tv_sec = timeout->tv_nsec = 0;
  2037. break;
  2038. }
  2039. /* Timeout, return less than vlen datagrams */
  2040. if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
  2041. break;
  2042. }
  2043. /* Out of band data, return right away */
  2044. if (msg_sys.msg_flags & MSG_OOB)
  2045. break;
  2046. }
  2047. out_put:
  2048. fput_light(sock->file, fput_needed);
  2049. if (err == 0)
  2050. return datagrams;
  2051. if (datagrams != 0) {
  2052. /*
  2053. * We may return less entries than requested (vlen) if the
  2054. * sock is non block and there aren't enough datagrams...
  2055. */
  2056. if (err != -EAGAIN) {
  2057. /*
  2058. * ... or if recvmsg returns an error after we
  2059. * received some datagrams, where we record the
  2060. * error to return on the next call or if the
  2061. * app asks about it using getsockopt(SO_ERROR).
  2062. */
  2063. sock->sk->sk_err = -err;
  2064. }
  2065. return datagrams;
  2066. }
  2067. return err;
  2068. }
  2069. SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
  2070. unsigned int, vlen, unsigned int, flags,
  2071. struct timespec __user *, timeout)
  2072. {
  2073. int datagrams;
  2074. struct timespec timeout_sys;
  2075. if (flags & MSG_CMSG_COMPAT)
  2076. return -EINVAL;
  2077. if (!timeout)
  2078. return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
  2079. if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
  2080. return -EFAULT;
  2081. datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
  2082. if (datagrams > 0 &&
  2083. copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
  2084. datagrams = -EFAULT;
  2085. return datagrams;
  2086. }
  2087. #ifdef __ARCH_WANT_SYS_SOCKETCALL
  2088. /* Argument list sizes for sys_socketcall */
  2089. #define AL(x) ((x) * sizeof(unsigned long))
  2090. static const unsigned char nargs[21] = {
  2091. AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
  2092. AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
  2093. AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
  2094. AL(4), AL(5), AL(4)
  2095. };
  2096. #undef AL
  2097. /*
  2098. * System call vectors.
  2099. *
  2100. * Argument checking cleaned up. Saved 20% in size.
  2101. * This function doesn't need to set the kernel lock because
  2102. * it is set by the callees.
  2103. */
  2104. SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
  2105. {
  2106. unsigned long a[AUDITSC_ARGS];
  2107. unsigned long a0, a1;
  2108. int err;
  2109. unsigned int len;
  2110. if (call < 1 || call > SYS_SENDMMSG)
  2111. return -EINVAL;
  2112. len = nargs[call];
  2113. if (len > sizeof(a))
  2114. return -EINVAL;
  2115. /* copy_from_user should be SMP safe. */
  2116. if (copy_from_user(a, args, len))
  2117. return -EFAULT;
  2118. err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
  2119. if (err)
  2120. return err;
  2121. a0 = a[0];
  2122. a1 = a[1];
  2123. switch (call) {
  2124. case SYS_SOCKET:
  2125. err = sys_socket(a0, a1, a[2]);
  2126. break;
  2127. case SYS_BIND:
  2128. err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
  2129. break;
  2130. case SYS_CONNECT:
  2131. err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
  2132. break;
  2133. case SYS_LISTEN:
  2134. err = sys_listen(a0, a1);
  2135. break;
  2136. case SYS_ACCEPT:
  2137. err = sys_accept4(a0, (struct sockaddr __user *)a1,
  2138. (int __user *)a[2], 0);
  2139. break;
  2140. case SYS_GETSOCKNAME:
  2141. err =
  2142. sys_getsockname(a0, (struct sockaddr __user *)a1,
  2143. (int __user *)a[2]);
  2144. break;
  2145. case SYS_GETPEERNAME:
  2146. err =
  2147. sys_getpeername(a0, (struct sockaddr __user *)a1,
  2148. (int __user *)a[2]);
  2149. break;
  2150. case SYS_SOCKETPAIR:
  2151. err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
  2152. break;
  2153. case SYS_SEND:
  2154. err = sys_send(a0, (void __user *)a1, a[2], a[3]);
  2155. break;
  2156. case SYS_SENDTO:
  2157. err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
  2158. (struct sockaddr __user *)a[4], a[5]);
  2159. break;
  2160. case SYS_RECV:
  2161. err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
  2162. break;
  2163. case SYS_RECVFROM:
  2164. err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
  2165. (struct sockaddr __user *)a[4],
  2166. (int __user *)a[5]);
  2167. break;
  2168. case SYS_SHUTDOWN:
  2169. err = sys_shutdown(a0, a1);
  2170. break;
  2171. case SYS_SETSOCKOPT:
  2172. err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
  2173. break;
  2174. case SYS_GETSOCKOPT:
  2175. err =
  2176. sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
  2177. (int __user *)a[4]);
  2178. break;
  2179. case SYS_SENDMSG:
  2180. err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
  2181. break;
  2182. case SYS_SENDMMSG:
  2183. err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
  2184. break;
  2185. case SYS_RECVMSG:
  2186. err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
  2187. break;
  2188. case SYS_RECVMMSG:
  2189. err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
  2190. (struct timespec __user *)a[4]);
  2191. break;
  2192. case SYS_ACCEPT4:
  2193. err = sys_accept4(a0, (struct sockaddr __user *)a1,
  2194. (int __user *)a[2], a[3]);
  2195. break;
  2196. default:
  2197. err = -EINVAL;
  2198. break;
  2199. }
  2200. return err;
  2201. }
  2202. #endif /* __ARCH_WANT_SYS_SOCKETCALL */
  2203. /**
  2204. * sock_register - add a socket protocol handler
  2205. * @ops: description of protocol
  2206. *
  2207. * This function is called by a protocol handler that wants to
  2208. * advertise its address family, and have it linked into the
  2209. * socket interface. The value ops->family coresponds to the
  2210. * socket system call protocol family.
  2211. */
  2212. int sock_register(const struct net_proto_family *ops)
  2213. {
  2214. int err;
  2215. if (ops->family >= NPROTO) {
  2216. printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
  2217. NPROTO);
  2218. return -ENOBUFS;
  2219. }
  2220. spin_lock(&net_family_lock);
  2221. if (rcu_dereference_protected(net_families[ops->family],
  2222. lockdep_is_held(&net_family_lock)))
  2223. err = -EEXIST;
  2224. else {
  2225. rcu_assign_pointer(net_families[ops->family], ops);
  2226. err = 0;
  2227. }
  2228. spin_unlock(&net_family_lock);
  2229. printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
  2230. return err;
  2231. }
  2232. EXPORT_SYMBOL(sock_register);
  2233. /**
  2234. * sock_unregister - remove a protocol handler
  2235. * @family: protocol family to remove
  2236. *
  2237. * This function is called by a protocol handler that wants to
  2238. * remove its address family, and have it unlinked from the
  2239. * new socket creation.
  2240. *
  2241. * If protocol handler is a module, then it can use module reference
  2242. * counts to protect against new references. If protocol handler is not
  2243. * a module then it needs to provide its own protection in
  2244. * the ops->create routine.
  2245. */
  2246. void sock_unregister(int family)
  2247. {
  2248. BUG_ON(family < 0 || family >= NPROTO);
  2249. spin_lock(&net_family_lock);
  2250. RCU_INIT_POINTER(net_families[family], NULL);
  2251. spin_unlock(&net_family_lock);
  2252. synchronize_rcu();
  2253. printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
  2254. }
  2255. EXPORT_SYMBOL(sock_unregister);
  2256. static int __init sock_init(void)
  2257. {
  2258. int err;
  2259. /*
  2260. * Initialize the network sysctl infrastructure.
  2261. */
  2262. err = net_sysctl_init();
  2263. if (err)
  2264. goto out;
  2265. /*
  2266. * Initialize skbuff SLAB cache
  2267. */
  2268. skb_init();
  2269. /*
  2270. * Initialize the protocols module.
  2271. */
  2272. init_inodecache();
  2273. err = register_filesystem(&sock_fs_type);
  2274. if (err)
  2275. goto out_fs;
  2276. sock_mnt = kern_mount(&sock_fs_type);
  2277. if (IS_ERR(sock_mnt)) {
  2278. err = PTR_ERR(sock_mnt);
  2279. goto out_mount;
  2280. }
  2281. /* The real protocol initialization is performed in later initcalls.
  2282. */
  2283. #ifdef CONFIG_NETFILTER
  2284. err = netfilter_init();
  2285. if (err)
  2286. goto out;
  2287. #endif
  2288. #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
  2289. skb_timestamping_init();
  2290. #endif
  2291. out:
  2292. return err;
  2293. out_mount:
  2294. unregister_filesystem(&sock_fs_type);
  2295. out_fs:
  2296. goto out;
  2297. }
  2298. core_initcall(sock_init); /* early initcall */
  2299. #ifdef CONFIG_PROC_FS
  2300. void socket_seq_show(struct seq_file *seq)
  2301. {
  2302. int cpu;
  2303. int counter = 0;
  2304. for_each_possible_cpu(cpu)
  2305. counter += per_cpu(sockets_in_use, cpu);
  2306. /* It can be negative, by the way. 8) */
  2307. if (counter < 0)
  2308. counter = 0;
  2309. seq_printf(seq, "sockets: used %d\n", counter);
  2310. }
  2311. #endif /* CONFIG_PROC_FS */
  2312. #ifdef CONFIG_COMPAT
  2313. static int do_siocgstamp(struct net *net, struct socket *sock,
  2314. unsigned int cmd, void __user *up)
  2315. {
  2316. mm_segment_t old_fs = get_fs();
  2317. struct timeval ktv;
  2318. int err;
  2319. set_fs(KERNEL_DS);
  2320. err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
  2321. set_fs(old_fs);
  2322. if (!err)
  2323. err = compat_put_timeval(&ktv, up);
  2324. return err;
  2325. }
  2326. static int do_siocgstampns(struct net *net, struct socket *sock,
  2327. unsigned int cmd, void __user *up)
  2328. {
  2329. mm_segment_t old_fs = get_fs();
  2330. struct timespec kts;
  2331. int err;
  2332. set_fs(KERNEL_DS);
  2333. err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
  2334. set_fs(old_fs);
  2335. if (!err)
  2336. err = compat_put_timespec(&kts, up);
  2337. return err;
  2338. }
  2339. static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
  2340. {
  2341. struct ifreq __user *uifr;
  2342. int err;
  2343. uifr = compat_alloc_user_space(sizeof(struct ifreq));
  2344. if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
  2345. return -EFAULT;
  2346. err = dev_ioctl(net, SIOCGIFNAME, uifr);
  2347. if (err)
  2348. return err;
  2349. if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
  2350. return -EFAULT;
  2351. return 0;
  2352. }
  2353. static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
  2354. {
  2355. struct compat_ifconf ifc32;
  2356. struct ifconf ifc;
  2357. struct ifconf __user *uifc;
  2358. struct compat_ifreq __user *ifr32;
  2359. struct ifreq __user *ifr;
  2360. unsigned int i, j;
  2361. int err;
  2362. if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
  2363. return -EFAULT;
  2364. memset(&ifc, 0, sizeof(ifc));
  2365. if (ifc32.ifcbuf == 0) {
  2366. ifc32.ifc_len = 0;
  2367. ifc.ifc_len = 0;
  2368. ifc.ifc_req = NULL;
  2369. uifc = compat_alloc_user_space(sizeof(struct ifconf));
  2370. } else {
  2371. size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
  2372. sizeof(struct ifreq);
  2373. uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
  2374. ifc.ifc_len = len;
  2375. ifr = ifc.ifc_req = (void __user *)(uifc + 1);
  2376. ifr32 = compat_ptr(ifc32.ifcbuf);
  2377. for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
  2378. if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
  2379. return -EFAULT;
  2380. ifr++;
  2381. ifr32++;
  2382. }
  2383. }
  2384. if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
  2385. return -EFAULT;
  2386. err = dev_ioctl(net, SIOCGIFCONF, uifc);
  2387. if (err)
  2388. return err;
  2389. if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
  2390. return -EFAULT;
  2391. ifr = ifc.ifc_req;
  2392. ifr32 = compat_ptr(ifc32.ifcbuf);
  2393. for (i = 0, j = 0;
  2394. i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
  2395. i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
  2396. if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
  2397. return -EFAULT;
  2398. ifr32++;
  2399. ifr++;
  2400. }
  2401. if (ifc32.ifcbuf == 0) {
  2402. /* Translate from 64-bit structure multiple to
  2403. * a 32-bit one.
  2404. */
  2405. i = ifc.ifc_len;
  2406. i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
  2407. ifc32.ifc_len = i;
  2408. } else {
  2409. ifc32.ifc_len = i;
  2410. }
  2411. if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
  2412. return -EFAULT;
  2413. return 0;
  2414. }
  2415. static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
  2416. {
  2417. struct compat_ethtool_rxnfc __user *compat_rxnfc;
  2418. bool convert_in = false, convert_out = false;
  2419. size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
  2420. struct ethtool_rxnfc __user *rxnfc;
  2421. struct ifreq __user *ifr;
  2422. u32 rule_cnt = 0, actual_rule_cnt;
  2423. u32 ethcmd;
  2424. u32 data;
  2425. int ret;
  2426. if (get_user(data, &ifr32->ifr_ifru.ifru_data))
  2427. return -EFAULT;
  2428. compat_rxnfc = compat_ptr(data);
  2429. if (get_user(ethcmd, &compat_rxnfc->cmd))
  2430. return -EFAULT;
  2431. /* Most ethtool structures are defined without padding.
  2432. * Unfortunately struct ethtool_rxnfc is an exception.
  2433. */
  2434. switch (ethcmd) {
  2435. default:
  2436. break;
  2437. case ETHTOOL_GRXCLSRLALL:
  2438. /* Buffer size is variable */
  2439. if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
  2440. return -EFAULT;
  2441. if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
  2442. return -ENOMEM;
  2443. buf_size += rule_cnt * sizeof(u32);
  2444. /* fall through */
  2445. case ETHTOOL_GRXRINGS:
  2446. case ETHTOOL_GRXCLSRLCNT:
  2447. case ETHTOOL_GRXCLSRULE:
  2448. case ETHTOOL_SRXCLSRLINS:
  2449. convert_out = true;
  2450. /* fall through */
  2451. case ETHTOOL_SRXCLSRLDEL:
  2452. buf_size += sizeof(struct ethtool_rxnfc);
  2453. convert_in = true;
  2454. break;
  2455. }
  2456. ifr = compat_alloc_user_space(buf_size);
  2457. rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
  2458. if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
  2459. return -EFAULT;
  2460. if (put_user(convert_in ? rxnfc : compat_ptr(data),
  2461. &ifr->ifr_ifru.ifru_data))
  2462. return -EFAULT;
  2463. if (convert_in) {
  2464. /* We expect there to be holes between fs.m_ext and
  2465. * fs.ring_cookie and at the end of fs, but nowhere else.
  2466. */
  2467. BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
  2468. sizeof(compat_rxnfc->fs.m_ext) !=
  2469. offsetof(struct ethtool_rxnfc, fs.m_ext) +
  2470. sizeof(rxnfc->fs.m_ext));
  2471. BUILD_BUG_ON(
  2472. offsetof(struct compat_ethtool_rxnfc, fs.location) -
  2473. offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
  2474. offsetof(struct ethtool_rxnfc, fs.location) -
  2475. offsetof(struct ethtool_rxnfc, fs.ring_cookie));
  2476. if (copy_in_user(rxnfc, compat_rxnfc,
  2477. (void __user *)(&rxnfc->fs.m_ext + 1) -
  2478. (void __user *)rxnfc) ||
  2479. copy_in_user(&rxnfc->fs.ring_cookie,
  2480. &compat_rxnfc->fs.ring_cookie,
  2481. (void __user *)(&rxnfc->fs.location + 1) -
  2482. (void __user *)&rxnfc->fs.ring_cookie) ||
  2483. copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
  2484. sizeof(rxnfc->rule_cnt)))
  2485. return -EFAULT;
  2486. }
  2487. ret = dev_ioctl(net, SIOCETHTOOL, ifr);
  2488. if (ret)
  2489. return ret;
  2490. if (convert_out) {
  2491. if (copy_in_user(compat_rxnfc, rxnfc,
  2492. (const void __user *)(&rxnfc->fs.m_ext + 1) -
  2493. (const void __user *)rxnfc) ||
  2494. copy_in_user(&compat_rxnfc->fs.ring_cookie,
  2495. &rxnfc->fs.ring_cookie,
  2496. (const void __user *)(&rxnfc->fs.location + 1) -
  2497. (const void __user *)&rxnfc->fs.ring_cookie) ||
  2498. copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
  2499. sizeof(rxnfc->rule_cnt)))
  2500. return -EFAULT;
  2501. if (ethcmd == ETHTOOL_GRXCLSRLALL) {
  2502. /* As an optimisation, we only copy the actual
  2503. * number of rules that the underlying
  2504. * function returned. Since Mallory might
  2505. * change the rule count in user memory, we
  2506. * check that it is less than the rule count
  2507. * originally given (as the user buffer size),
  2508. * which has been range-checked.
  2509. */
  2510. if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
  2511. return -EFAULT;
  2512. if (actual_rule_cnt < rule_cnt)
  2513. rule_cnt = actual_rule_cnt;
  2514. if (copy_in_user(&compat_rxnfc->rule_locs[0],
  2515. &rxnfc->rule_locs[0],
  2516. rule_cnt * sizeof(u32)))
  2517. return -EFAULT;
  2518. }
  2519. }
  2520. return 0;
  2521. }
  2522. static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
  2523. {
  2524. void __user *uptr;
  2525. compat_uptr_t uptr32;
  2526. struct ifreq __user *uifr;
  2527. uifr = compat_alloc_user_space(sizeof(*uifr));
  2528. if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
  2529. return -EFAULT;
  2530. if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
  2531. return -EFAULT;
  2532. uptr = compat_ptr(uptr32);
  2533. if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
  2534. return -EFAULT;
  2535. return dev_ioctl(net, SIOCWANDEV, uifr);
  2536. }
  2537. static int bond_ioctl(struct net *net, unsigned int cmd,
  2538. struct compat_ifreq __user *ifr32)
  2539. {
  2540. struct ifreq kifr;
  2541. struct ifreq __user *uifr;
  2542. mm_segment_t old_fs;
  2543. int err;
  2544. u32 data;
  2545. void __user *datap;
  2546. switch (cmd) {
  2547. case SIOCBONDENSLAVE:
  2548. case SIOCBONDRELEASE:
  2549. case SIOCBONDSETHWADDR:
  2550. case SIOCBONDCHANGEACTIVE:
  2551. if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
  2552. return -EFAULT;
  2553. old_fs = get_fs();
  2554. set_fs(KERNEL_DS);
  2555. err = dev_ioctl(net, cmd,
  2556. (struct ifreq __user __force *) &kifr);
  2557. set_fs(old_fs);
  2558. return err;
  2559. case SIOCBONDSLAVEINFOQUERY:
  2560. case SIOCBONDINFOQUERY:
  2561. uifr = compat_alloc_user_space(sizeof(*uifr));
  2562. if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
  2563. return -EFAULT;
  2564. if (get_user(data, &ifr32->ifr_ifru.ifru_data))
  2565. return -EFAULT;
  2566. datap = compat_ptr(data);
  2567. if (put_user(datap, &uifr->ifr_ifru.ifru_data))
  2568. return -EFAULT;
  2569. return dev_ioctl(net, cmd, uifr);
  2570. default:
  2571. return -ENOIOCTLCMD;
  2572. }
  2573. }
  2574. static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
  2575. struct compat_ifreq __user *u_ifreq32)
  2576. {
  2577. struct ifreq __user *u_ifreq64;
  2578. char tmp_buf[IFNAMSIZ];
  2579. void __user *data64;
  2580. u32 data32;
  2581. if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
  2582. IFNAMSIZ))
  2583. return -EFAULT;
  2584. if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
  2585. return -EFAULT;
  2586. data64 = compat_ptr(data32);
  2587. u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
  2588. /* Don't check these user accesses, just let that get trapped
  2589. * in the ioctl handler instead.
  2590. */
  2591. if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
  2592. IFNAMSIZ))
  2593. return -EFAULT;
  2594. if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
  2595. return -EFAULT;
  2596. return dev_ioctl(net, cmd, u_ifreq64);
  2597. }
  2598. static int dev_ifsioc(struct net *net, struct socket *sock,
  2599. unsigned int cmd, struct compat_ifreq __user *uifr32)
  2600. {
  2601. struct ifreq __user *uifr;
  2602. int err;
  2603. uifr = compat_alloc_user_space(sizeof(*uifr));
  2604. if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
  2605. return -EFAULT;
  2606. err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
  2607. if (!err) {
  2608. switch (cmd) {
  2609. case SIOCGIFFLAGS:
  2610. case SIOCGIFMETRIC:
  2611. case SIOCGIFMTU:
  2612. case SIOCGIFMEM:
  2613. case SIOCGIFHWADDR:
  2614. case SIOCGIFINDEX:
  2615. case SIOCGIFADDR:
  2616. case SIOCGIFBRDADDR:
  2617. case SIOCGIFDSTADDR:
  2618. case SIOCGIFNETMASK:
  2619. case SIOCGIFPFLAGS:
  2620. case SIOCGIFTXQLEN:
  2621. case SIOCGMIIPHY:
  2622. case SIOCGMIIREG:
  2623. if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
  2624. err = -EFAULT;
  2625. break;
  2626. }
  2627. }
  2628. return err;
  2629. }
  2630. static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
  2631. struct compat_ifreq __user *uifr32)
  2632. {
  2633. struct ifreq ifr;
  2634. struct compat_ifmap __user *uifmap32;
  2635. mm_segment_t old_fs;
  2636. int err;
  2637. uifmap32 = &uifr32->ifr_ifru.ifru_map;
  2638. err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
  2639. err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
  2640. err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
  2641. err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
  2642. err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
  2643. err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
  2644. err |= get_user(ifr.ifr_map.port, &uifmap32->port);
  2645. if (err)
  2646. return -EFAULT;
  2647. old_fs = get_fs();
  2648. set_fs(KERNEL_DS);
  2649. err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
  2650. set_fs(old_fs);
  2651. if (cmd == SIOCGIFMAP && !err) {
  2652. err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
  2653. err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
  2654. err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
  2655. err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
  2656. err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
  2657. err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
  2658. err |= put_user(ifr.ifr_map.port, &uifmap32->port);
  2659. if (err)
  2660. err = -EFAULT;
  2661. }
  2662. return err;
  2663. }
  2664. static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
  2665. {
  2666. void __user *uptr;
  2667. compat_uptr_t uptr32;
  2668. struct ifreq __user *uifr;
  2669. uifr = compat_alloc_user_space(sizeof(*uifr));
  2670. if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
  2671. return -EFAULT;
  2672. if (get_user(uptr32, &uifr32->ifr_data))
  2673. return -EFAULT;
  2674. uptr = compat_ptr(uptr32);
  2675. if (put_user(uptr, &uifr->ifr_data))
  2676. return -EFAULT;
  2677. return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
  2678. }
  2679. struct rtentry32 {
  2680. u32 rt_pad1;
  2681. struct sockaddr rt_dst; /* target address */
  2682. struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
  2683. struct sockaddr rt_genmask; /* target network mask (IP) */
  2684. unsigned short rt_flags;
  2685. short rt_pad2;
  2686. u32 rt_pad3;
  2687. unsigned char rt_tos;
  2688. unsigned char rt_class;
  2689. short rt_pad4;
  2690. short rt_metric; /* +1 for binary compatibility! */
  2691. /* char * */ u32 rt_dev; /* forcing the device at add */
  2692. u32 rt_mtu; /* per route MTU/Window */
  2693. u32 rt_window; /* Window clamping */
  2694. unsigned short rt_irtt; /* Initial RTT */
  2695. };
  2696. struct in6_rtmsg32 {
  2697. struct in6_addr rtmsg_dst;
  2698. struct in6_addr rtmsg_src;
  2699. struct in6_addr rtmsg_gateway;
  2700. u32 rtmsg_type;
  2701. u16 rtmsg_dst_len;
  2702. u16 rtmsg_src_len;
  2703. u32 rtmsg_metric;
  2704. u32 rtmsg_info;
  2705. u32 rtmsg_flags;
  2706. s32 rtmsg_ifindex;
  2707. };
  2708. static int routing_ioctl(struct net *net, struct socket *sock,
  2709. unsigned int cmd, void __user *argp)
  2710. {
  2711. int ret;
  2712. void *r = NULL;
  2713. struct in6_rtmsg r6;
  2714. struct rtentry r4;
  2715. char devname[16];
  2716. u32 rtdev;
  2717. mm_segment_t old_fs = get_fs();
  2718. if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
  2719. struct in6_rtmsg32 __user *ur6 = argp;
  2720. ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
  2721. 3 * sizeof(struct in6_addr));
  2722. ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
  2723. ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
  2724. ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
  2725. ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
  2726. ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
  2727. ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
  2728. ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
  2729. r = (void *) &r6;
  2730. } else { /* ipv4 */
  2731. struct rtentry32 __user *ur4 = argp;
  2732. ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
  2733. 3 * sizeof(struct sockaddr));
  2734. ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
  2735. ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
  2736. ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
  2737. ret |= get_user(r4.rt_window, &(ur4->rt_window));
  2738. ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
  2739. ret |= get_user(rtdev, &(ur4->rt_dev));
  2740. if (rtdev) {
  2741. ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
  2742. r4.rt_dev = (char __user __force *)devname;
  2743. devname[15] = 0;
  2744. } else
  2745. r4.rt_dev = NULL;
  2746. r = (void *) &r4;
  2747. }
  2748. if (ret) {
  2749. ret = -EFAULT;
  2750. goto out;
  2751. }
  2752. set_fs(KERNEL_DS);
  2753. ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
  2754. set_fs(old_fs);
  2755. out:
  2756. return ret;
  2757. }
  2758. /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
  2759. * for some operations; this forces use of the newer bridge-utils that
  2760. * use compatible ioctls
  2761. */
  2762. static int old_bridge_ioctl(compat_ulong_t __user *argp)
  2763. {
  2764. compat_ulong_t tmp;
  2765. if (get_user(tmp, argp))
  2766. return -EFAULT;
  2767. if (tmp == BRCTL_GET_VERSION)
  2768. return BRCTL_VERSION + 1;
  2769. return -EINVAL;
  2770. }
  2771. static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
  2772. unsigned int cmd, unsigned long arg)
  2773. {
  2774. void __user *argp = compat_ptr(arg);
  2775. struct sock *sk = sock->sk;
  2776. struct net *net = sock_net(sk);
  2777. if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
  2778. return siocdevprivate_ioctl(net, cmd, argp);
  2779. switch (cmd) {
  2780. case SIOCSIFBR:
  2781. case SIOCGIFBR:
  2782. return old_bridge_ioctl(argp);
  2783. case SIOCGIFNAME:
  2784. return dev_ifname32(net, argp);
  2785. case SIOCGIFCONF:
  2786. return dev_ifconf(net, argp);
  2787. case SIOCETHTOOL:
  2788. return ethtool_ioctl(net, argp);
  2789. case SIOCWANDEV:
  2790. return compat_siocwandev(net, argp);
  2791. case SIOCGIFMAP:
  2792. case SIOCSIFMAP:
  2793. return compat_sioc_ifmap(net, cmd, argp);
  2794. case SIOCBONDENSLAVE:
  2795. case SIOCBONDRELEASE:
  2796. case SIOCBONDSETHWADDR:
  2797. case SIOCBONDSLAVEINFOQUERY:
  2798. case SIOCBONDINFOQUERY:
  2799. case SIOCBONDCHANGEACTIVE:
  2800. return bond_ioctl(net, cmd, argp);
  2801. case SIOCADDRT:
  2802. case SIOCDELRT:
  2803. return routing_ioctl(net, sock, cmd, argp);
  2804. case SIOCGSTAMP:
  2805. return do_siocgstamp(net, sock, cmd, argp);
  2806. case SIOCGSTAMPNS:
  2807. return do_siocgstampns(net, sock, cmd, argp);
  2808. case SIOCSHWTSTAMP:
  2809. return compat_siocshwtstamp(net, argp);
  2810. case FIOSETOWN:
  2811. case SIOCSPGRP:
  2812. case FIOGETOWN:
  2813. case SIOCGPGRP:
  2814. case SIOCBRADDBR:
  2815. case SIOCBRDELBR:
  2816. case SIOCGIFVLAN:
  2817. case SIOCSIFVLAN:
  2818. case SIOCADDDLCI:
  2819. case SIOCDELDLCI:
  2820. return sock_ioctl(file, cmd, arg);
  2821. case SIOCGIFFLAGS:
  2822. case SIOCSIFFLAGS:
  2823. case SIOCGIFMETRIC:
  2824. case SIOCSIFMETRIC:
  2825. case SIOCGIFMTU:
  2826. case SIOCSIFMTU:
  2827. case SIOCGIFMEM:
  2828. case SIOCSIFMEM:
  2829. case SIOCGIFHWADDR:
  2830. case SIOCSIFHWADDR:
  2831. case SIOCADDMULTI:
  2832. case SIOCDELMULTI:
  2833. case SIOCGIFINDEX:
  2834. case SIOCGIFADDR:
  2835. case SIOCSIFADDR:
  2836. case SIOCSIFHWBROADCAST:
  2837. case SIOCDIFADDR:
  2838. case SIOCGIFBRDADDR:
  2839. case SIOCSIFBRDADDR:
  2840. case SIOCGIFDSTADDR:
  2841. case SIOCSIFDSTADDR:
  2842. case SIOCGIFNETMASK:
  2843. case SIOCSIFNETMASK:
  2844. case SIOCSIFPFLAGS:
  2845. case SIOCGIFPFLAGS:
  2846. case SIOCGIFTXQLEN:
  2847. case SIOCSIFTXQLEN:
  2848. case SIOCBRADDIF:
  2849. case SIOCBRDELIF:
  2850. case SIOCSIFNAME:
  2851. case SIOCGMIIPHY:
  2852. case SIOCGMIIREG:
  2853. case SIOCSMIIREG:
  2854. return dev_ifsioc(net, sock, cmd, argp);
  2855. case SIOCSARP:
  2856. case SIOCGARP:
  2857. case SIOCDARP:
  2858. case SIOCATMARK:
  2859. return sock_do_ioctl(net, sock, cmd, arg);
  2860. }
  2861. return -ENOIOCTLCMD;
  2862. }
  2863. static long compat_sock_ioctl(struct file *file, unsigned int cmd,
  2864. unsigned long arg)
  2865. {
  2866. struct socket *sock = file->private_data;
  2867. int ret = -ENOIOCTLCMD;
  2868. struct sock *sk;
  2869. struct net *net;
  2870. sk = sock->sk;
  2871. net = sock_net(sk);
  2872. if (sock->ops->compat_ioctl)
  2873. ret = sock->ops->compat_ioctl(sock, cmd, arg);
  2874. if (ret == -ENOIOCTLCMD &&
  2875. (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
  2876. ret = compat_wext_handle_ioctl(net, cmd, arg);
  2877. if (ret == -ENOIOCTLCMD)
  2878. ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
  2879. return ret;
  2880. }
  2881. #endif
  2882. int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
  2883. {
  2884. return sock->ops->bind(sock, addr, addrlen);
  2885. }
  2886. EXPORT_SYMBOL(kernel_bind);
  2887. int kernel_listen(struct socket *sock, int backlog)
  2888. {
  2889. return sock->ops->listen(sock, backlog);
  2890. }
  2891. EXPORT_SYMBOL(kernel_listen);
  2892. int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
  2893. {
  2894. struct sock *sk = sock->sk;
  2895. int err;
  2896. err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
  2897. newsock);
  2898. if (err < 0)
  2899. goto done;
  2900. err = sock->ops->accept(sock, *newsock, flags);
  2901. if (err < 0) {
  2902. sock_release(*newsock);
  2903. *newsock = NULL;
  2904. goto done;
  2905. }
  2906. (*newsock)->ops = sock->ops;
  2907. __module_get((*newsock)->ops->owner);
  2908. done:
  2909. return err;
  2910. }
  2911. EXPORT_SYMBOL(kernel_accept);
  2912. int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
  2913. int flags)
  2914. {
  2915. return sock->ops->connect(sock, addr, addrlen, flags);
  2916. }
  2917. EXPORT_SYMBOL(kernel_connect);
  2918. int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
  2919. int *addrlen)
  2920. {
  2921. return sock->ops->getname(sock, addr, addrlen, 0);
  2922. }
  2923. EXPORT_SYMBOL(kernel_getsockname);
  2924. int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
  2925. int *addrlen)
  2926. {
  2927. return sock->ops->getname(sock, addr, addrlen, 1);
  2928. }
  2929. EXPORT_SYMBOL(kernel_getpeername);
  2930. int kernel_getsockopt(struct socket *sock, int level, int optname,
  2931. char *optval, int *optlen)
  2932. {
  2933. mm_segment_t oldfs = get_fs();
  2934. char __user *uoptval;
  2935. int __user *uoptlen;
  2936. int err;
  2937. uoptval = (char __user __force *) optval;
  2938. uoptlen = (int __user __force *) optlen;
  2939. set_fs(KERNEL_DS);
  2940. if (level == SOL_SOCKET)
  2941. err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
  2942. else
  2943. err = sock->ops->getsockopt(sock, level, optname, uoptval,
  2944. uoptlen);
  2945. set_fs(oldfs);
  2946. return err;
  2947. }
  2948. EXPORT_SYMBOL(kernel_getsockopt);
  2949. int kernel_setsockopt(struct socket *sock, int level, int optname,
  2950. char *optval, unsigned int optlen)
  2951. {
  2952. mm_segment_t oldfs = get_fs();
  2953. char __user *uoptval;
  2954. int err;
  2955. uoptval = (char __user __force *) optval;
  2956. set_fs(KERNEL_DS);
  2957. if (level == SOL_SOCKET)
  2958. err = sock_setsockopt(sock, level, optname, uoptval, optlen);
  2959. else
  2960. err = sock->ops->setsockopt(sock, level, optname, uoptval,
  2961. optlen);
  2962. set_fs(oldfs);
  2963. return err;
  2964. }
  2965. EXPORT_SYMBOL(kernel_setsockopt);
  2966. int kernel_sendpage(struct socket *sock, struct page *page, int offset,
  2967. size_t size, int flags)
  2968. {
  2969. if (sock->ops->sendpage)
  2970. return sock->ops->sendpage(sock, page, offset, size, flags);
  2971. return sock_no_sendpage(sock, page, offset, size, flags);
  2972. }
  2973. EXPORT_SYMBOL(kernel_sendpage);
  2974. int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
  2975. {
  2976. mm_segment_t oldfs = get_fs();
  2977. int err;
  2978. set_fs(KERNEL_DS);
  2979. err = sock->ops->ioctl(sock, cmd, arg);
  2980. set_fs(oldfs);
  2981. return err;
  2982. }
  2983. EXPORT_SYMBOL(kernel_sock_ioctl);
  2984. int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
  2985. {
  2986. return sock->ops->shutdown(sock, how);
  2987. }
  2988. EXPORT_SYMBOL(kernel_sock_shutdown);