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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 | ||
61 | #include <linux/mm.h> | |
62 | #include <linux/socket.h> | |
63 | #include <linux/file.h> | |
64 | #include <linux/net.h> | |
65 | #include <linux/interrupt.h> | |
66 | #include <linux/thread_info.h> | |
67 | #include <linux/rcupdate.h> | |
68 | #include <linux/netdevice.h> | |
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
71 | #include <linux/mutex.h> | |
72 | #include <linux/wanrouter.h> | |
73 | #include <linux/if_bridge.h> | |
74 | #include <linux/if_frad.h> | |
75 | #include <linux/if_vlan.h> | |
76 | #include <linux/init.h> | |
77 | #include <linux/poll.h> | |
78 | #include <linux/cache.h> | |
79 | #include <linux/module.h> | |
80 | #include <linux/highmem.h> | |
81 | #include <linux/mount.h> | |
82 | #include <linux/security.h> | |
83 | #include <linux/syscalls.h> | |
84 | #include <linux/compat.h> | |
85 | #include <linux/kmod.h> | |
86 | #include <linux/audit.h> | |
87 | #include <linux/wireless.h> | |
88 | #include <linux/nsproxy.h> | |
89 | #include <linux/magic.h> | |
90 | ||
91 | #include <asm/uaccess.h> | |
92 | #include <asm/unistd.h> | |
93 | ||
94 | #include <net/compat.h> | |
95 | #include <net/wext.h> | |
96 | ||
97 | #include <net/sock.h> | |
98 | #include <linux/netfilter.h> | |
99 | ||
100 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); | |
101 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
102 | unsigned long nr_segs, loff_t pos); | |
103 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
104 | unsigned long nr_segs, loff_t pos); | |
105 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); | |
106 | ||
107 | static int sock_close(struct inode *inode, struct file *file); | |
108 | static unsigned int sock_poll(struct file *file, | |
109 | struct poll_table_struct *wait); | |
110 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); | |
111 | #ifdef CONFIG_COMPAT | |
112 | static long compat_sock_ioctl(struct file *file, | |
113 | unsigned int cmd, unsigned long arg); | |
114 | #endif | |
115 | static int sock_fasync(int fd, struct file *filp, int on); | |
116 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
117 | int offset, size_t size, loff_t *ppos, int more); | |
118 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, | |
119 | struct pipe_inode_info *pipe, size_t len, | |
120 | unsigned int flags); | |
121 | ||
122 | /* | |
123 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
124 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
125 | */ | |
126 | ||
127 | static const struct file_operations socket_file_ops = { | |
128 | .owner = THIS_MODULE, | |
129 | .llseek = no_llseek, | |
130 | .aio_read = sock_aio_read, | |
131 | .aio_write = sock_aio_write, | |
132 | .poll = sock_poll, | |
133 | .unlocked_ioctl = sock_ioctl, | |
134 | #ifdef CONFIG_COMPAT | |
135 | .compat_ioctl = compat_sock_ioctl, | |
136 | #endif | |
137 | .mmap = sock_mmap, | |
138 | .open = sock_no_open, /* special open code to disallow open via /proc */ | |
139 | .release = sock_close, | |
140 | .fasync = sock_fasync, | |
141 | .sendpage = sock_sendpage, | |
142 | .splice_write = generic_splice_sendpage, | |
143 | .splice_read = sock_splice_read, | |
144 | }; | |
145 | ||
146 | /* | |
147 | * The protocol list. Each protocol is registered in here. | |
148 | */ | |
149 | ||
150 | static DEFINE_SPINLOCK(net_family_lock); | |
151 | static const struct net_proto_family *net_families[NPROTO] __read_mostly; | |
152 | ||
153 | /* | |
154 | * Statistics counters of the socket lists | |
155 | */ | |
156 | ||
157 | static DEFINE_PER_CPU(int, sockets_in_use) = 0; | |
158 | ||
159 | /* | |
160 | * Support routines. | |
161 | * Move socket addresses back and forth across the kernel/user | |
162 | * divide and look after the messy bits. | |
163 | */ | |
164 | ||
165 | #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - | |
166 | 16 for IP, 16 for IPX, | |
167 | 24 for IPv6, | |
168 | about 80 for AX.25 | |
169 | must be at least one bigger than | |
170 | the AF_UNIX size (see net/unix/af_unix.c | |
171 | :unix_mkname()). | |
172 | */ | |
173 | ||
174 | /** | |
175 | * move_addr_to_kernel - copy a socket address into kernel space | |
176 | * @uaddr: Address in user space | |
177 | * @kaddr: Address in kernel space | |
178 | * @ulen: Length in user space | |
179 | * | |
180 | * The address is copied into kernel space. If the provided address is | |
181 | * too long an error code of -EINVAL is returned. If the copy gives | |
182 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
183 | */ | |
184 | ||
185 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr) | |
186 | { | |
187 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) | |
188 | return -EINVAL; | |
189 | if (ulen == 0) | |
190 | return 0; | |
191 | if (copy_from_user(kaddr, uaddr, ulen)) | |
192 | return -EFAULT; | |
193 | return audit_sockaddr(ulen, kaddr); | |
194 | } | |
195 | ||
196 | /** | |
197 | * move_addr_to_user - copy an address to user space | |
198 | * @kaddr: kernel space address | |
199 | * @klen: length of address in kernel | |
200 | * @uaddr: user space address | |
201 | * @ulen: pointer to user length field | |
202 | * | |
203 | * The value pointed to by ulen on entry is the buffer length available. | |
204 | * This is overwritten with the buffer space used. -EINVAL is returned | |
205 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
206 | * is returned if either the buffer or the length field are not | |
207 | * accessible. | |
208 | * After copying the data up to the limit the user specifies, the true | |
209 | * length of the data is written over the length limit the user | |
210 | * specified. Zero is returned for a success. | |
211 | */ | |
212 | ||
213 | int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr, | |
214 | int __user *ulen) | |
215 | { | |
216 | int err; | |
217 | int len; | |
218 | ||
219 | err = get_user(len, ulen); | |
220 | if (err) | |
221 | return err; | |
222 | if (len > klen) | |
223 | len = klen; | |
224 | if (len < 0 || len > sizeof(struct sockaddr_storage)) | |
225 | return -EINVAL; | |
226 | if (len) { | |
227 | if (audit_sockaddr(klen, kaddr)) | |
228 | return -ENOMEM; | |
229 | if (copy_to_user(uaddr, kaddr, len)) | |
230 | return -EFAULT; | |
231 | } | |
232 | /* | |
233 | * "fromlen shall refer to the value before truncation.." | |
234 | * 1003.1g | |
235 | */ | |
236 | return __put_user(klen, ulen); | |
237 | } | |
238 | ||
239 | static struct kmem_cache *sock_inode_cachep __read_mostly; | |
240 | ||
241 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
242 | { | |
243 | struct socket_alloc *ei; | |
244 | ||
245 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); | |
246 | if (!ei) | |
247 | return NULL; | |
248 | init_waitqueue_head(&ei->socket.wait); | |
249 | ||
250 | ei->socket.fasync_list = NULL; | |
251 | ei->socket.state = SS_UNCONNECTED; | |
252 | ei->socket.flags = 0; | |
253 | ei->socket.ops = NULL; | |
254 | ei->socket.sk = NULL; | |
255 | ei->socket.file = NULL; | |
256 | ||
257 | return &ei->vfs_inode; | |
258 | } | |
259 | ||
260 | static void sock_destroy_inode(struct inode *inode) | |
261 | { | |
262 | kmem_cache_free(sock_inode_cachep, | |
263 | container_of(inode, struct socket_alloc, vfs_inode)); | |
264 | } | |
265 | ||
266 | static void init_once(void *foo) | |
267 | { | |
268 | struct socket_alloc *ei = (struct socket_alloc *)foo; | |
269 | ||
270 | inode_init_once(&ei->vfs_inode); | |
271 | } | |
272 | ||
273 | static int init_inodecache(void) | |
274 | { | |
275 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
276 | sizeof(struct socket_alloc), | |
277 | 0, | |
278 | (SLAB_HWCACHE_ALIGN | | |
279 | SLAB_RECLAIM_ACCOUNT | | |
280 | SLAB_MEM_SPREAD), | |
281 | init_once); | |
282 | if (sock_inode_cachep == NULL) | |
283 | return -ENOMEM; | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static const struct super_operations sockfs_ops = { | |
288 | .alloc_inode = sock_alloc_inode, | |
289 | .destroy_inode =sock_destroy_inode, | |
290 | .statfs = simple_statfs, | |
291 | }; | |
292 | ||
293 | static int sockfs_get_sb(struct file_system_type *fs_type, | |
294 | int flags, const char *dev_name, void *data, | |
295 | struct vfsmount *mnt) | |
296 | { | |
297 | return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, | |
298 | mnt); | |
299 | } | |
300 | ||
301 | static struct vfsmount *sock_mnt __read_mostly; | |
302 | ||
303 | static struct file_system_type sock_fs_type = { | |
304 | .name = "sockfs", | |
305 | .get_sb = sockfs_get_sb, | |
306 | .kill_sb = kill_anon_super, | |
307 | }; | |
308 | ||
309 | static int sockfs_delete_dentry(struct dentry *dentry) | |
310 | { | |
311 | /* | |
312 | * At creation time, we pretended this dentry was hashed | |
313 | * (by clearing DCACHE_UNHASHED bit in d_flags) | |
314 | * At delete time, we restore the truth : not hashed. | |
315 | * (so that dput() can proceed correctly) | |
316 | */ | |
317 | dentry->d_flags |= DCACHE_UNHASHED; | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /* | |
322 | * sockfs_dname() is called from d_path(). | |
323 | */ | |
324 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
325 | { | |
326 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
327 | dentry->d_inode->i_ino); | |
328 | } | |
329 | ||
330 | static const struct dentry_operations sockfs_dentry_operations = { | |
331 | .d_delete = sockfs_delete_dentry, | |
332 | .d_dname = sockfs_dname, | |
333 | }; | |
334 | ||
335 | /* | |
336 | * Obtains the first available file descriptor and sets it up for use. | |
337 | * | |
338 | * These functions create file structures and maps them to fd space | |
339 | * of the current process. On success it returns file descriptor | |
340 | * and file struct implicitly stored in sock->file. | |
341 | * Note that another thread may close file descriptor before we return | |
342 | * from this function. We use the fact that now we do not refer | |
343 | * to socket after mapping. If one day we will need it, this | |
344 | * function will increment ref. count on file by 1. | |
345 | * | |
346 | * In any case returned fd MAY BE not valid! | |
347 | * This race condition is unavoidable | |
348 | * with shared fd spaces, we cannot solve it inside kernel, | |
349 | * but we take care of internal coherence yet. | |
350 | */ | |
351 | ||
352 | static int sock_alloc_fd(struct file **filep, int flags) | |
353 | { | |
354 | int fd; | |
355 | ||
356 | fd = get_unused_fd_flags(flags); | |
357 | if (likely(fd >= 0)) { | |
358 | struct file *file = get_empty_filp(); | |
359 | ||
360 | *filep = file; | |
361 | if (unlikely(!file)) { | |
362 | put_unused_fd(fd); | |
363 | return -ENFILE; | |
364 | } | |
365 | } else | |
366 | *filep = NULL; | |
367 | return fd; | |
368 | } | |
369 | ||
370 | static int sock_attach_fd(struct socket *sock, struct file *file, int flags) | |
371 | { | |
372 | struct dentry *dentry; | |
373 | struct qstr name = { .name = "" }; | |
374 | ||
375 | dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name); | |
376 | if (unlikely(!dentry)) | |
377 | return -ENOMEM; | |
378 | ||
379 | dentry->d_op = &sockfs_dentry_operations; | |
380 | /* | |
381 | * We dont want to push this dentry into global dentry hash table. | |
382 | * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED | |
383 | * This permits a working /proc/$pid/fd/XXX on sockets | |
384 | */ | |
385 | dentry->d_flags &= ~DCACHE_UNHASHED; | |
386 | d_instantiate(dentry, SOCK_INODE(sock)); | |
387 | ||
388 | sock->file = file; | |
389 | init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE, | |
390 | &socket_file_ops); | |
391 | SOCK_INODE(sock)->i_fop = &socket_file_ops; | |
392 | file->f_flags = O_RDWR | (flags & O_NONBLOCK); | |
393 | file->f_pos = 0; | |
394 | file->private_data = sock; | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | int sock_map_fd(struct socket *sock, int flags) | |
400 | { | |
401 | struct file *newfile; | |
402 | int fd = sock_alloc_fd(&newfile, flags); | |
403 | ||
404 | if (likely(fd >= 0)) { | |
405 | int err = sock_attach_fd(sock, newfile, flags); | |
406 | ||
407 | if (unlikely(err < 0)) { | |
408 | put_filp(newfile); | |
409 | put_unused_fd(fd); | |
410 | return err; | |
411 | } | |
412 | fd_install(fd, newfile); | |
413 | } | |
414 | return fd; | |
415 | } | |
416 | ||
417 | static struct socket *sock_from_file(struct file *file, int *err) | |
418 | { | |
419 | if (file->f_op == &socket_file_ops) | |
420 | return file->private_data; /* set in sock_map_fd */ | |
421 | ||
422 | *err = -ENOTSOCK; | |
423 | return NULL; | |
424 | } | |
425 | ||
426 | /** | |
427 | * sockfd_lookup - Go from a file number to its socket slot | |
428 | * @fd: file handle | |
429 | * @err: pointer to an error code return | |
430 | * | |
431 | * The file handle passed in is locked and the socket it is bound | |
432 | * too is returned. If an error occurs the err pointer is overwritten | |
433 | * with a negative errno code and NULL is returned. The function checks | |
434 | * for both invalid handles and passing a handle which is not a socket. | |
435 | * | |
436 | * On a success the socket object pointer is returned. | |
437 | */ | |
438 | ||
439 | struct socket *sockfd_lookup(int fd, int *err) | |
440 | { | |
441 | struct file *file; | |
442 | struct socket *sock; | |
443 | ||
444 | file = fget(fd); | |
445 | if (!file) { | |
446 | *err = -EBADF; | |
447 | return NULL; | |
448 | } | |
449 | ||
450 | sock = sock_from_file(file, err); | |
451 | if (!sock) | |
452 | fput(file); | |
453 | return sock; | |
454 | } | |
455 | ||
456 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) | |
457 | { | |
458 | struct file *file; | |
459 | struct socket *sock; | |
460 | ||
461 | *err = -EBADF; | |
462 | file = fget_light(fd, fput_needed); | |
463 | if (file) { | |
464 | sock = sock_from_file(file, err); | |
465 | if (sock) | |
466 | return sock; | |
467 | fput_light(file, *fput_needed); | |
468 | } | |
469 | return NULL; | |
470 | } | |
471 | ||
472 | /** | |
473 | * sock_alloc - allocate a socket | |
474 | * | |
475 | * Allocate a new inode and socket object. The two are bound together | |
476 | * and initialised. The socket is then returned. If we are out of inodes | |
477 | * NULL is returned. | |
478 | */ | |
479 | ||
480 | static struct socket *sock_alloc(void) | |
481 | { | |
482 | struct inode *inode; | |
483 | struct socket *sock; | |
484 | ||
485 | inode = new_inode(sock_mnt->mnt_sb); | |
486 | if (!inode) | |
487 | return NULL; | |
488 | ||
489 | sock = SOCKET_I(inode); | |
490 | ||
491 | kmemcheck_annotate_bitfield(sock, type); | |
492 | inode->i_mode = S_IFSOCK | S_IRWXUGO; | |
493 | inode->i_uid = current_fsuid(); | |
494 | inode->i_gid = current_fsgid(); | |
495 | ||
496 | percpu_add(sockets_in_use, 1); | |
497 | return sock; | |
498 | } | |
499 | ||
500 | /* | |
501 | * In theory you can't get an open on this inode, but /proc provides | |
502 | * a back door. Remember to keep it shut otherwise you'll let the | |
503 | * creepy crawlies in. | |
504 | */ | |
505 | ||
506 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) | |
507 | { | |
508 | return -ENXIO; | |
509 | } | |
510 | ||
511 | const struct file_operations bad_sock_fops = { | |
512 | .owner = THIS_MODULE, | |
513 | .open = sock_no_open, | |
514 | }; | |
515 | ||
516 | /** | |
517 | * sock_release - close a socket | |
518 | * @sock: socket to close | |
519 | * | |
520 | * The socket is released from the protocol stack if it has a release | |
521 | * callback, and the inode is then released if the socket is bound to | |
522 | * an inode not a file. | |
523 | */ | |
524 | ||
525 | void sock_release(struct socket *sock) | |
526 | { | |
527 | if (sock->ops) { | |
528 | struct module *owner = sock->ops->owner; | |
529 | ||
530 | sock->ops->release(sock); | |
531 | sock->ops = NULL; | |
532 | module_put(owner); | |
533 | } | |
534 | ||
535 | if (sock->fasync_list) | |
536 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); | |
537 | ||
538 | percpu_sub(sockets_in_use, 1); | |
539 | if (!sock->file) { | |
540 | iput(SOCK_INODE(sock)); | |
541 | return; | |
542 | } | |
543 | sock->file = NULL; | |
544 | } | |
545 | ||
546 | int sock_tx_timestamp(struct msghdr *msg, struct sock *sk, | |
547 | union skb_shared_tx *shtx) | |
548 | { | |
549 | shtx->flags = 0; | |
550 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) | |
551 | shtx->hardware = 1; | |
552 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) | |
553 | shtx->software = 1; | |
554 | return 0; | |
555 | } | |
556 | EXPORT_SYMBOL(sock_tx_timestamp); | |
557 | ||
558 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
559 | struct msghdr *msg, size_t size) | |
560 | { | |
561 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
562 | int err; | |
563 | ||
564 | si->sock = sock; | |
565 | si->scm = NULL; | |
566 | si->msg = msg; | |
567 | si->size = size; | |
568 | ||
569 | err = security_socket_sendmsg(sock, msg, size); | |
570 | if (err) | |
571 | return err; | |
572 | ||
573 | return sock->ops->sendmsg(iocb, sock, msg, size); | |
574 | } | |
575 | ||
576 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | |
577 | { | |
578 | struct kiocb iocb; | |
579 | struct sock_iocb siocb; | |
580 | int ret; | |
581 | ||
582 | init_sync_kiocb(&iocb, NULL); | |
583 | iocb.private = &siocb; | |
584 | ret = __sock_sendmsg(&iocb, sock, msg, size); | |
585 | if (-EIOCBQUEUED == ret) | |
586 | ret = wait_on_sync_kiocb(&iocb); | |
587 | return ret; | |
588 | } | |
589 | ||
590 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
591 | struct kvec *vec, size_t num, size_t size) | |
592 | { | |
593 | mm_segment_t oldfs = get_fs(); | |
594 | int result; | |
595 | ||
596 | set_fs(KERNEL_DS); | |
597 | /* | |
598 | * the following is safe, since for compiler definitions of kvec and | |
599 | * iovec are identical, yielding the same in-core layout and alignment | |
600 | */ | |
601 | msg->msg_iov = (struct iovec *)vec; | |
602 | msg->msg_iovlen = num; | |
603 | result = sock_sendmsg(sock, msg, size); | |
604 | set_fs(oldfs); | |
605 | return result; | |
606 | } | |
607 | ||
608 | static int ktime2ts(ktime_t kt, struct timespec *ts) | |
609 | { | |
610 | if (kt.tv64) { | |
611 | *ts = ktime_to_timespec(kt); | |
612 | return 1; | |
613 | } else { | |
614 | return 0; | |
615 | } | |
616 | } | |
617 | ||
618 | /* | |
619 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
620 | */ | |
621 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
622 | struct sk_buff *skb) | |
623 | { | |
624 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); | |
625 | struct timespec ts[3]; | |
626 | int empty = 1; | |
627 | struct skb_shared_hwtstamps *shhwtstamps = | |
628 | skb_hwtstamps(skb); | |
629 | ||
630 | /* Race occurred between timestamp enabling and packet | |
631 | receiving. Fill in the current time for now. */ | |
632 | if (need_software_tstamp && skb->tstamp.tv64 == 0) | |
633 | __net_timestamp(skb); | |
634 | ||
635 | if (need_software_tstamp) { | |
636 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
637 | struct timeval tv; | |
638 | skb_get_timestamp(skb, &tv); | |
639 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, | |
640 | sizeof(tv), &tv); | |
641 | } else { | |
642 | struct timespec ts; | |
643 | skb_get_timestampns(skb, &ts); | |
644 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, | |
645 | sizeof(ts), &ts); | |
646 | } | |
647 | } | |
648 | ||
649 | ||
650 | memset(ts, 0, sizeof(ts)); | |
651 | if (skb->tstamp.tv64 && | |
652 | sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) { | |
653 | skb_get_timestampns(skb, ts + 0); | |
654 | empty = 0; | |
655 | } | |
656 | if (shhwtstamps) { | |
657 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) && | |
658 | ktime2ts(shhwtstamps->syststamp, ts + 1)) | |
659 | empty = 0; | |
660 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) && | |
661 | ktime2ts(shhwtstamps->hwtstamp, ts + 2)) | |
662 | empty = 0; | |
663 | } | |
664 | if (!empty) | |
665 | put_cmsg(msg, SOL_SOCKET, | |
666 | SCM_TIMESTAMPING, sizeof(ts), &ts); | |
667 | } | |
668 | ||
669 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); | |
670 | ||
671 | inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) | |
672 | { | |
673 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount) | |
674 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, | |
675 | sizeof(__u32), &skb->dropcount); | |
676 | } | |
677 | ||
678 | void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
679 | struct sk_buff *skb) | |
680 | { | |
681 | sock_recv_timestamp(msg, sk, skb); | |
682 | sock_recv_drops(msg, sk, skb); | |
683 | } | |
684 | EXPORT_SYMBOL_GPL(sock_recv_ts_and_drops); | |
685 | ||
686 | static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock, | |
687 | struct msghdr *msg, size_t size, int flags) | |
688 | { | |
689 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
690 | ||
691 | si->sock = sock; | |
692 | si->scm = NULL; | |
693 | si->msg = msg; | |
694 | si->size = size; | |
695 | si->flags = flags; | |
696 | ||
697 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); | |
698 | } | |
699 | ||
700 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
701 | struct msghdr *msg, size_t size, int flags) | |
702 | { | |
703 | int err = security_socket_recvmsg(sock, msg, size, flags); | |
704 | ||
705 | return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags); | |
706 | } | |
707 | ||
708 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, | |
709 | size_t size, int flags) | |
710 | { | |
711 | struct kiocb iocb; | |
712 | struct sock_iocb siocb; | |
713 | int ret; | |
714 | ||
715 | init_sync_kiocb(&iocb, NULL); | |
716 | iocb.private = &siocb; | |
717 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); | |
718 | if (-EIOCBQUEUED == ret) | |
719 | ret = wait_on_sync_kiocb(&iocb); | |
720 | return ret; | |
721 | } | |
722 | ||
723 | static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, | |
724 | size_t size, int flags) | |
725 | { | |
726 | struct kiocb iocb; | |
727 | struct sock_iocb siocb; | |
728 | int ret; | |
729 | ||
730 | init_sync_kiocb(&iocb, NULL); | |
731 | iocb.private = &siocb; | |
732 | ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags); | |
733 | if (-EIOCBQUEUED == ret) | |
734 | ret = wait_on_sync_kiocb(&iocb); | |
735 | return ret; | |
736 | } | |
737 | ||
738 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, | |
739 | struct kvec *vec, size_t num, size_t size, int flags) | |
740 | { | |
741 | mm_segment_t oldfs = get_fs(); | |
742 | int result; | |
743 | ||
744 | set_fs(KERNEL_DS); | |
745 | /* | |
746 | * the following is safe, since for compiler definitions of kvec and | |
747 | * iovec are identical, yielding the same in-core layout and alignment | |
748 | */ | |
749 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; | |
750 | result = sock_recvmsg(sock, msg, size, flags); | |
751 | set_fs(oldfs); | |
752 | return result; | |
753 | } | |
754 | ||
755 | static void sock_aio_dtor(struct kiocb *iocb) | |
756 | { | |
757 | kfree(iocb->private); | |
758 | } | |
759 | ||
760 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
761 | int offset, size_t size, loff_t *ppos, int more) | |
762 | { | |
763 | struct socket *sock; | |
764 | int flags; | |
765 | ||
766 | sock = file->private_data; | |
767 | ||
768 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
769 | if (more) | |
770 | flags |= MSG_MORE; | |
771 | ||
772 | return kernel_sendpage(sock, page, offset, size, flags); | |
773 | } | |
774 | ||
775 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, | |
776 | struct pipe_inode_info *pipe, size_t len, | |
777 | unsigned int flags) | |
778 | { | |
779 | struct socket *sock = file->private_data; | |
780 | ||
781 | if (unlikely(!sock->ops->splice_read)) | |
782 | return -EINVAL; | |
783 | ||
784 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); | |
785 | } | |
786 | ||
787 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, | |
788 | struct sock_iocb *siocb) | |
789 | { | |
790 | if (!is_sync_kiocb(iocb)) { | |
791 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); | |
792 | if (!siocb) | |
793 | return NULL; | |
794 | iocb->ki_dtor = sock_aio_dtor; | |
795 | } | |
796 | ||
797 | siocb->kiocb = iocb; | |
798 | iocb->private = siocb; | |
799 | return siocb; | |
800 | } | |
801 | ||
802 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, | |
803 | struct file *file, const struct iovec *iov, | |
804 | unsigned long nr_segs) | |
805 | { | |
806 | struct socket *sock = file->private_data; | |
807 | size_t size = 0; | |
808 | int i; | |
809 | ||
810 | for (i = 0; i < nr_segs; i++) | |
811 | size += iov[i].iov_len; | |
812 | ||
813 | msg->msg_name = NULL; | |
814 | msg->msg_namelen = 0; | |
815 | msg->msg_control = NULL; | |
816 | msg->msg_controllen = 0; | |
817 | msg->msg_iov = (struct iovec *)iov; | |
818 | msg->msg_iovlen = nr_segs; | |
819 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
820 | ||
821 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); | |
822 | } | |
823 | ||
824 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
825 | unsigned long nr_segs, loff_t pos) | |
826 | { | |
827 | struct sock_iocb siocb, *x; | |
828 | ||
829 | if (pos != 0) | |
830 | return -ESPIPE; | |
831 | ||
832 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
833 | return 0; | |
834 | ||
835 | ||
836 | x = alloc_sock_iocb(iocb, &siocb); | |
837 | if (!x) | |
838 | return -ENOMEM; | |
839 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); | |
840 | } | |
841 | ||
842 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, | |
843 | struct file *file, const struct iovec *iov, | |
844 | unsigned long nr_segs) | |
845 | { | |
846 | struct socket *sock = file->private_data; | |
847 | size_t size = 0; | |
848 | int i; | |
849 | ||
850 | for (i = 0; i < nr_segs; i++) | |
851 | size += iov[i].iov_len; | |
852 | ||
853 | msg->msg_name = NULL; | |
854 | msg->msg_namelen = 0; | |
855 | msg->msg_control = NULL; | |
856 | msg->msg_controllen = 0; | |
857 | msg->msg_iov = (struct iovec *)iov; | |
858 | msg->msg_iovlen = nr_segs; | |
859 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
860 | if (sock->type == SOCK_SEQPACKET) | |
861 | msg->msg_flags |= MSG_EOR; | |
862 | ||
863 | return __sock_sendmsg(iocb, sock, msg, size); | |
864 | } | |
865 | ||
866 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
867 | unsigned long nr_segs, loff_t pos) | |
868 | { | |
869 | struct sock_iocb siocb, *x; | |
870 | ||
871 | if (pos != 0) | |
872 | return -ESPIPE; | |
873 | ||
874 | x = alloc_sock_iocb(iocb, &siocb); | |
875 | if (!x) | |
876 | return -ENOMEM; | |
877 | ||
878 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); | |
879 | } | |
880 | ||
881 | /* | |
882 | * Atomic setting of ioctl hooks to avoid race | |
883 | * with module unload. | |
884 | */ | |
885 | ||
886 | static DEFINE_MUTEX(br_ioctl_mutex); | |
887 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL; | |
888 | ||
889 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) | |
890 | { | |
891 | mutex_lock(&br_ioctl_mutex); | |
892 | br_ioctl_hook = hook; | |
893 | mutex_unlock(&br_ioctl_mutex); | |
894 | } | |
895 | ||
896 | EXPORT_SYMBOL(brioctl_set); | |
897 | ||
898 | static DEFINE_MUTEX(vlan_ioctl_mutex); | |
899 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); | |
900 | ||
901 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) | |
902 | { | |
903 | mutex_lock(&vlan_ioctl_mutex); | |
904 | vlan_ioctl_hook = hook; | |
905 | mutex_unlock(&vlan_ioctl_mutex); | |
906 | } | |
907 | ||
908 | EXPORT_SYMBOL(vlan_ioctl_set); | |
909 | ||
910 | static DEFINE_MUTEX(dlci_ioctl_mutex); | |
911 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); | |
912 | ||
913 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) | |
914 | { | |
915 | mutex_lock(&dlci_ioctl_mutex); | |
916 | dlci_ioctl_hook = hook; | |
917 | mutex_unlock(&dlci_ioctl_mutex); | |
918 | } | |
919 | ||
920 | EXPORT_SYMBOL(dlci_ioctl_set); | |
921 | ||
922 | /* | |
923 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
924 | * what to do with it - that's up to the protocol still. | |
925 | */ | |
926 | ||
927 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
928 | { | |
929 | struct socket *sock; | |
930 | struct sock *sk; | |
931 | void __user *argp = (void __user *)arg; | |
932 | int pid, err; | |
933 | struct net *net; | |
934 | ||
935 | sock = file->private_data; | |
936 | sk = sock->sk; | |
937 | net = sock_net(sk); | |
938 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { | |
939 | err = dev_ioctl(net, cmd, argp); | |
940 | } else | |
941 | #ifdef CONFIG_WEXT_CORE | |
942 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { | |
943 | err = dev_ioctl(net, cmd, argp); | |
944 | } else | |
945 | #endif | |
946 | switch (cmd) { | |
947 | case FIOSETOWN: | |
948 | case SIOCSPGRP: | |
949 | err = -EFAULT; | |
950 | if (get_user(pid, (int __user *)argp)) | |
951 | break; | |
952 | err = f_setown(sock->file, pid, 1); | |
953 | break; | |
954 | case FIOGETOWN: | |
955 | case SIOCGPGRP: | |
956 | err = put_user(f_getown(sock->file), | |
957 | (int __user *)argp); | |
958 | break; | |
959 | case SIOCGIFBR: | |
960 | case SIOCSIFBR: | |
961 | case SIOCBRADDBR: | |
962 | case SIOCBRDELBR: | |
963 | err = -ENOPKG; | |
964 | if (!br_ioctl_hook) | |
965 | request_module("bridge"); | |
966 | ||
967 | mutex_lock(&br_ioctl_mutex); | |
968 | if (br_ioctl_hook) | |
969 | err = br_ioctl_hook(net, cmd, argp); | |
970 | mutex_unlock(&br_ioctl_mutex); | |
971 | break; | |
972 | case SIOCGIFVLAN: | |
973 | case SIOCSIFVLAN: | |
974 | err = -ENOPKG; | |
975 | if (!vlan_ioctl_hook) | |
976 | request_module("8021q"); | |
977 | ||
978 | mutex_lock(&vlan_ioctl_mutex); | |
979 | if (vlan_ioctl_hook) | |
980 | err = vlan_ioctl_hook(net, argp); | |
981 | mutex_unlock(&vlan_ioctl_mutex); | |
982 | break; | |
983 | case SIOCADDDLCI: | |
984 | case SIOCDELDLCI: | |
985 | err = -ENOPKG; | |
986 | if (!dlci_ioctl_hook) | |
987 | request_module("dlci"); | |
988 | ||
989 | mutex_lock(&dlci_ioctl_mutex); | |
990 | if (dlci_ioctl_hook) | |
991 | err = dlci_ioctl_hook(cmd, argp); | |
992 | mutex_unlock(&dlci_ioctl_mutex); | |
993 | break; | |
994 | default: | |
995 | err = sock->ops->ioctl(sock, cmd, arg); | |
996 | ||
997 | /* | |
998 | * If this ioctl is unknown try to hand it down | |
999 | * to the NIC driver. | |
1000 | */ | |
1001 | if (err == -ENOIOCTLCMD) | |
1002 | err = dev_ioctl(net, cmd, argp); | |
1003 | break; | |
1004 | } | |
1005 | return err; | |
1006 | } | |
1007 | ||
1008 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
1009 | { | |
1010 | int err; | |
1011 | struct socket *sock = NULL; | |
1012 | ||
1013 | err = security_socket_create(family, type, protocol, 1); | |
1014 | if (err) | |
1015 | goto out; | |
1016 | ||
1017 | sock = sock_alloc(); | |
1018 | if (!sock) { | |
1019 | err = -ENOMEM; | |
1020 | goto out; | |
1021 | } | |
1022 | ||
1023 | sock->type = type; | |
1024 | err = security_socket_post_create(sock, family, type, protocol, 1); | |
1025 | if (err) | |
1026 | goto out_release; | |
1027 | ||
1028 | out: | |
1029 | *res = sock; | |
1030 | return err; | |
1031 | out_release: | |
1032 | sock_release(sock); | |
1033 | sock = NULL; | |
1034 | goto out; | |
1035 | } | |
1036 | ||
1037 | /* No kernel lock held - perfect */ | |
1038 | static unsigned int sock_poll(struct file *file, poll_table *wait) | |
1039 | { | |
1040 | struct socket *sock; | |
1041 | ||
1042 | /* | |
1043 | * We can't return errors to poll, so it's either yes or no. | |
1044 | */ | |
1045 | sock = file->private_data; | |
1046 | return sock->ops->poll(file, sock, wait); | |
1047 | } | |
1048 | ||
1049 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) | |
1050 | { | |
1051 | struct socket *sock = file->private_data; | |
1052 | ||
1053 | return sock->ops->mmap(file, sock, vma); | |
1054 | } | |
1055 | ||
1056 | static int sock_close(struct inode *inode, struct file *filp) | |
1057 | { | |
1058 | /* | |
1059 | * It was possible the inode is NULL we were | |
1060 | * closing an unfinished socket. | |
1061 | */ | |
1062 | ||
1063 | if (!inode) { | |
1064 | printk(KERN_DEBUG "sock_close: NULL inode\n"); | |
1065 | return 0; | |
1066 | } | |
1067 | sock_release(SOCKET_I(inode)); | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Update the socket async list | |
1073 | * | |
1074 | * Fasync_list locking strategy. | |
1075 | * | |
1076 | * 1. fasync_list is modified only under process context socket lock | |
1077 | * i.e. under semaphore. | |
1078 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
1079 | * or under socket lock. | |
1080 | * 3. fasync_list can be used from softirq context, so that | |
1081 | * modification under socket lock have to be enhanced with | |
1082 | * write_lock_bh(&sk->sk_callback_lock). | |
1083 | * --ANK (990710) | |
1084 | */ | |
1085 | ||
1086 | static int sock_fasync(int fd, struct file *filp, int on) | |
1087 | { | |
1088 | struct fasync_struct *fa, *fna = NULL, **prev; | |
1089 | struct socket *sock; | |
1090 | struct sock *sk; | |
1091 | ||
1092 | if (on) { | |
1093 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); | |
1094 | if (fna == NULL) | |
1095 | return -ENOMEM; | |
1096 | } | |
1097 | ||
1098 | sock = filp->private_data; | |
1099 | ||
1100 | sk = sock->sk; | |
1101 | if (sk == NULL) { | |
1102 | kfree(fna); | |
1103 | return -EINVAL; | |
1104 | } | |
1105 | ||
1106 | lock_sock(sk); | |
1107 | ||
1108 | spin_lock(&filp->f_lock); | |
1109 | if (on) | |
1110 | filp->f_flags |= FASYNC; | |
1111 | else | |
1112 | filp->f_flags &= ~FASYNC; | |
1113 | spin_unlock(&filp->f_lock); | |
1114 | ||
1115 | prev = &(sock->fasync_list); | |
1116 | ||
1117 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) | |
1118 | if (fa->fa_file == filp) | |
1119 | break; | |
1120 | ||
1121 | if (on) { | |
1122 | if (fa != NULL) { | |
1123 | write_lock_bh(&sk->sk_callback_lock); | |
1124 | fa->fa_fd = fd; | |
1125 | write_unlock_bh(&sk->sk_callback_lock); | |
1126 | ||
1127 | kfree(fna); | |
1128 | goto out; | |
1129 | } | |
1130 | fna->fa_file = filp; | |
1131 | fna->fa_fd = fd; | |
1132 | fna->magic = FASYNC_MAGIC; | |
1133 | fna->fa_next = sock->fasync_list; | |
1134 | write_lock_bh(&sk->sk_callback_lock); | |
1135 | sock->fasync_list = fna; | |
1136 | sock_set_flag(sk, SOCK_FASYNC); | |
1137 | write_unlock_bh(&sk->sk_callback_lock); | |
1138 | } else { | |
1139 | if (fa != NULL) { | |
1140 | write_lock_bh(&sk->sk_callback_lock); | |
1141 | *prev = fa->fa_next; | |
1142 | if (!sock->fasync_list) | |
1143 | sock_reset_flag(sk, SOCK_FASYNC); | |
1144 | write_unlock_bh(&sk->sk_callback_lock); | |
1145 | kfree(fa); | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | out: | |
1150 | release_sock(sock->sk); | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | /* This function may be called only under socket lock or callback_lock */ | |
1155 | ||
1156 | int sock_wake_async(struct socket *sock, int how, int band) | |
1157 | { | |
1158 | if (!sock || !sock->fasync_list) | |
1159 | return -1; | |
1160 | switch (how) { | |
1161 | case SOCK_WAKE_WAITD: | |
1162 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) | |
1163 | break; | |
1164 | goto call_kill; | |
1165 | case SOCK_WAKE_SPACE: | |
1166 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) | |
1167 | break; | |
1168 | /* fall through */ | |
1169 | case SOCK_WAKE_IO: | |
1170 | call_kill: | |
1171 | __kill_fasync(sock->fasync_list, SIGIO, band); | |
1172 | break; | |
1173 | case SOCK_WAKE_URG: | |
1174 | __kill_fasync(sock->fasync_list, SIGURG, band); | |
1175 | } | |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static int __sock_create(struct net *net, int family, int type, int protocol, | |
1180 | struct socket **res, int kern) | |
1181 | { | |
1182 | int err; | |
1183 | struct socket *sock; | |
1184 | const struct net_proto_family *pf; | |
1185 | ||
1186 | /* | |
1187 | * Check protocol is in range | |
1188 | */ | |
1189 | if (family < 0 || family >= NPROTO) | |
1190 | return -EAFNOSUPPORT; | |
1191 | if (type < 0 || type >= SOCK_MAX) | |
1192 | return -EINVAL; | |
1193 | ||
1194 | /* Compatibility. | |
1195 | ||
1196 | This uglymoron is moved from INET layer to here to avoid | |
1197 | deadlock in module load. | |
1198 | */ | |
1199 | if (family == PF_INET && type == SOCK_PACKET) { | |
1200 | static int warned; | |
1201 | if (!warned) { | |
1202 | warned = 1; | |
1203 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", | |
1204 | current->comm); | |
1205 | } | |
1206 | family = PF_PACKET; | |
1207 | } | |
1208 | ||
1209 | err = security_socket_create(family, type, protocol, kern); | |
1210 | if (err) | |
1211 | return err; | |
1212 | ||
1213 | /* | |
1214 | * Allocate the socket and allow the family to set things up. if | |
1215 | * the protocol is 0, the family is instructed to select an appropriate | |
1216 | * default. | |
1217 | */ | |
1218 | sock = sock_alloc(); | |
1219 | if (!sock) { | |
1220 | if (net_ratelimit()) | |
1221 | printk(KERN_WARNING "socket: no more sockets\n"); | |
1222 | return -ENFILE; /* Not exactly a match, but its the | |
1223 | closest posix thing */ | |
1224 | } | |
1225 | ||
1226 | sock->type = type; | |
1227 | ||
1228 | #ifdef CONFIG_MODULES | |
1229 | /* Attempt to load a protocol module if the find failed. | |
1230 | * | |
1231 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1232 | * requested real, full-featured networking support upon configuration. | |
1233 | * Otherwise module support will break! | |
1234 | */ | |
1235 | if (net_families[family] == NULL) | |
1236 | request_module("net-pf-%d", family); | |
1237 | #endif | |
1238 | ||
1239 | rcu_read_lock(); | |
1240 | pf = rcu_dereference(net_families[family]); | |
1241 | err = -EAFNOSUPPORT; | |
1242 | if (!pf) | |
1243 | goto out_release; | |
1244 | ||
1245 | /* | |
1246 | * We will call the ->create function, that possibly is in a loadable | |
1247 | * module, so we have to bump that loadable module refcnt first. | |
1248 | */ | |
1249 | if (!try_module_get(pf->owner)) | |
1250 | goto out_release; | |
1251 | ||
1252 | /* Now protected by module ref count */ | |
1253 | rcu_read_unlock(); | |
1254 | ||
1255 | err = pf->create(net, sock, protocol, kern); | |
1256 | if (err < 0) | |
1257 | goto out_module_put; | |
1258 | ||
1259 | /* | |
1260 | * Now to bump the refcnt of the [loadable] module that owns this | |
1261 | * socket at sock_release time we decrement its refcnt. | |
1262 | */ | |
1263 | if (!try_module_get(sock->ops->owner)) | |
1264 | goto out_module_busy; | |
1265 | ||
1266 | /* | |
1267 | * Now that we're done with the ->create function, the [loadable] | |
1268 | * module can have its refcnt decremented | |
1269 | */ | |
1270 | module_put(pf->owner); | |
1271 | err = security_socket_post_create(sock, family, type, protocol, kern); | |
1272 | if (err) | |
1273 | goto out_sock_release; | |
1274 | *res = sock; | |
1275 | ||
1276 | return 0; | |
1277 | ||
1278 | out_module_busy: | |
1279 | err = -EAFNOSUPPORT; | |
1280 | out_module_put: | |
1281 | sock->ops = NULL; | |
1282 | module_put(pf->owner); | |
1283 | out_sock_release: | |
1284 | sock_release(sock); | |
1285 | return err; | |
1286 | ||
1287 | out_release: | |
1288 | rcu_read_unlock(); | |
1289 | goto out_sock_release; | |
1290 | } | |
1291 | ||
1292 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1293 | { | |
1294 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); | |
1295 | } | |
1296 | ||
1297 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1298 | { | |
1299 | return __sock_create(&init_net, family, type, protocol, res, 1); | |
1300 | } | |
1301 | ||
1302 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) | |
1303 | { | |
1304 | int retval; | |
1305 | struct socket *sock; | |
1306 | int flags; | |
1307 | ||
1308 | /* Check the SOCK_* constants for consistency. */ | |
1309 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1310 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1311 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1312 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1313 | ||
1314 | flags = type & ~SOCK_TYPE_MASK; | |
1315 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1316 | return -EINVAL; | |
1317 | type &= SOCK_TYPE_MASK; | |
1318 | ||
1319 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1320 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1321 | ||
1322 | retval = sock_create(family, type, protocol, &sock); | |
1323 | if (retval < 0) | |
1324 | goto out; | |
1325 | ||
1326 | retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); | |
1327 | if (retval < 0) | |
1328 | goto out_release; | |
1329 | ||
1330 | out: | |
1331 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1332 | return retval; | |
1333 | ||
1334 | out_release: | |
1335 | sock_release(sock); | |
1336 | return retval; | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Create a pair of connected sockets. | |
1341 | */ | |
1342 | ||
1343 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, | |
1344 | int __user *, usockvec) | |
1345 | { | |
1346 | struct socket *sock1, *sock2; | |
1347 | int fd1, fd2, err; | |
1348 | struct file *newfile1, *newfile2; | |
1349 | int flags; | |
1350 | ||
1351 | flags = type & ~SOCK_TYPE_MASK; | |
1352 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1353 | return -EINVAL; | |
1354 | type &= SOCK_TYPE_MASK; | |
1355 | ||
1356 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1357 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1358 | ||
1359 | /* | |
1360 | * Obtain the first socket and check if the underlying protocol | |
1361 | * supports the socketpair call. | |
1362 | */ | |
1363 | ||
1364 | err = sock_create(family, type, protocol, &sock1); | |
1365 | if (err < 0) | |
1366 | goto out; | |
1367 | ||
1368 | err = sock_create(family, type, protocol, &sock2); | |
1369 | if (err < 0) | |
1370 | goto out_release_1; | |
1371 | ||
1372 | err = sock1->ops->socketpair(sock1, sock2); | |
1373 | if (err < 0) | |
1374 | goto out_release_both; | |
1375 | ||
1376 | fd1 = sock_alloc_fd(&newfile1, flags & O_CLOEXEC); | |
1377 | if (unlikely(fd1 < 0)) { | |
1378 | err = fd1; | |
1379 | goto out_release_both; | |
1380 | } | |
1381 | ||
1382 | fd2 = sock_alloc_fd(&newfile2, flags & O_CLOEXEC); | |
1383 | if (unlikely(fd2 < 0)) { | |
1384 | err = fd2; | |
1385 | put_filp(newfile1); | |
1386 | put_unused_fd(fd1); | |
1387 | goto out_release_both; | |
1388 | } | |
1389 | ||
1390 | err = sock_attach_fd(sock1, newfile1, flags & O_NONBLOCK); | |
1391 | if (unlikely(err < 0)) { | |
1392 | goto out_fd2; | |
1393 | } | |
1394 | ||
1395 | err = sock_attach_fd(sock2, newfile2, flags & O_NONBLOCK); | |
1396 | if (unlikely(err < 0)) { | |
1397 | fput(newfile1); | |
1398 | goto out_fd1; | |
1399 | } | |
1400 | ||
1401 | audit_fd_pair(fd1, fd2); | |
1402 | fd_install(fd1, newfile1); | |
1403 | fd_install(fd2, newfile2); | |
1404 | /* fd1 and fd2 may be already another descriptors. | |
1405 | * Not kernel problem. | |
1406 | */ | |
1407 | ||
1408 | err = put_user(fd1, &usockvec[0]); | |
1409 | if (!err) | |
1410 | err = put_user(fd2, &usockvec[1]); | |
1411 | if (!err) | |
1412 | return 0; | |
1413 | ||
1414 | sys_close(fd2); | |
1415 | sys_close(fd1); | |
1416 | return err; | |
1417 | ||
1418 | out_release_both: | |
1419 | sock_release(sock2); | |
1420 | out_release_1: | |
1421 | sock_release(sock1); | |
1422 | out: | |
1423 | return err; | |
1424 | ||
1425 | out_fd2: | |
1426 | put_filp(newfile1); | |
1427 | sock_release(sock1); | |
1428 | out_fd1: | |
1429 | put_filp(newfile2); | |
1430 | sock_release(sock2); | |
1431 | put_unused_fd(fd1); | |
1432 | put_unused_fd(fd2); | |
1433 | goto out; | |
1434 | } | |
1435 | ||
1436 | /* | |
1437 | * Bind a name to a socket. Nothing much to do here since it's | |
1438 | * the protocol's responsibility to handle the local address. | |
1439 | * | |
1440 | * We move the socket address to kernel space before we call | |
1441 | * the protocol layer (having also checked the address is ok). | |
1442 | */ | |
1443 | ||
1444 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) | |
1445 | { | |
1446 | struct socket *sock; | |
1447 | struct sockaddr_storage address; | |
1448 | int err, fput_needed; | |
1449 | ||
1450 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1451 | if (sock) { | |
1452 | err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address); | |
1453 | if (err >= 0) { | |
1454 | err = security_socket_bind(sock, | |
1455 | (struct sockaddr *)&address, | |
1456 | addrlen); | |
1457 | if (!err) | |
1458 | err = sock->ops->bind(sock, | |
1459 | (struct sockaddr *) | |
1460 | &address, addrlen); | |
1461 | } | |
1462 | fput_light(sock->file, fput_needed); | |
1463 | } | |
1464 | return err; | |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * Perform a listen. Basically, we allow the protocol to do anything | |
1469 | * necessary for a listen, and if that works, we mark the socket as | |
1470 | * ready for listening. | |
1471 | */ | |
1472 | ||
1473 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) | |
1474 | { | |
1475 | struct socket *sock; | |
1476 | int err, fput_needed; | |
1477 | int somaxconn; | |
1478 | ||
1479 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1480 | if (sock) { | |
1481 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; | |
1482 | if ((unsigned)backlog > somaxconn) | |
1483 | backlog = somaxconn; | |
1484 | ||
1485 | err = security_socket_listen(sock, backlog); | |
1486 | if (!err) | |
1487 | err = sock->ops->listen(sock, backlog); | |
1488 | ||
1489 | fput_light(sock->file, fput_needed); | |
1490 | } | |
1491 | return err; | |
1492 | } | |
1493 | ||
1494 | /* | |
1495 | * For accept, we attempt to create a new socket, set up the link | |
1496 | * with the client, wake up the client, then return the new | |
1497 | * connected fd. We collect the address of the connector in kernel | |
1498 | * space and move it to user at the very end. This is unclean because | |
1499 | * we open the socket then return an error. | |
1500 | * | |
1501 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1502 | * status to recvmsg. We need to add that support in a way thats | |
1503 | * clean when we restucture accept also. | |
1504 | */ | |
1505 | ||
1506 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1507 | int __user *, upeer_addrlen, int, flags) | |
1508 | { | |
1509 | struct socket *sock, *newsock; | |
1510 | struct file *newfile; | |
1511 | int err, len, newfd, fput_needed; | |
1512 | struct sockaddr_storage address; | |
1513 | ||
1514 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1515 | return -EINVAL; | |
1516 | ||
1517 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1518 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1519 | ||
1520 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1521 | if (!sock) | |
1522 | goto out; | |
1523 | ||
1524 | err = -ENFILE; | |
1525 | if (!(newsock = sock_alloc())) | |
1526 | goto out_put; | |
1527 | ||
1528 | newsock->type = sock->type; | |
1529 | newsock->ops = sock->ops; | |
1530 | ||
1531 | /* | |
1532 | * We don't need try_module_get here, as the listening socket (sock) | |
1533 | * has the protocol module (sock->ops->owner) held. | |
1534 | */ | |
1535 | __module_get(newsock->ops->owner); | |
1536 | ||
1537 | newfd = sock_alloc_fd(&newfile, flags & O_CLOEXEC); | |
1538 | if (unlikely(newfd < 0)) { | |
1539 | err = newfd; | |
1540 | sock_release(newsock); | |
1541 | goto out_put; | |
1542 | } | |
1543 | ||
1544 | err = sock_attach_fd(newsock, newfile, flags & O_NONBLOCK); | |
1545 | if (err < 0) | |
1546 | goto out_fd_simple; | |
1547 | ||
1548 | err = security_socket_accept(sock, newsock); | |
1549 | if (err) | |
1550 | goto out_fd; | |
1551 | ||
1552 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); | |
1553 | if (err < 0) | |
1554 | goto out_fd; | |
1555 | ||
1556 | if (upeer_sockaddr) { | |
1557 | if (newsock->ops->getname(newsock, (struct sockaddr *)&address, | |
1558 | &len, 2) < 0) { | |
1559 | err = -ECONNABORTED; | |
1560 | goto out_fd; | |
1561 | } | |
1562 | err = move_addr_to_user((struct sockaddr *)&address, | |
1563 | len, upeer_sockaddr, upeer_addrlen); | |
1564 | if (err < 0) | |
1565 | goto out_fd; | |
1566 | } | |
1567 | ||
1568 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1569 | ||
1570 | fd_install(newfd, newfile); | |
1571 | err = newfd; | |
1572 | ||
1573 | out_put: | |
1574 | fput_light(sock->file, fput_needed); | |
1575 | out: | |
1576 | return err; | |
1577 | out_fd_simple: | |
1578 | sock_release(newsock); | |
1579 | put_filp(newfile); | |
1580 | put_unused_fd(newfd); | |
1581 | goto out_put; | |
1582 | out_fd: | |
1583 | fput(newfile); | |
1584 | put_unused_fd(newfd); | |
1585 | goto out_put; | |
1586 | } | |
1587 | ||
1588 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1589 | int __user *, upeer_addrlen) | |
1590 | { | |
1591 | return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * Attempt to connect to a socket with the server address. The address | |
1596 | * is in user space so we verify it is OK and move it to kernel space. | |
1597 | * | |
1598 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1599 | * break bindings | |
1600 | * | |
1601 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1602 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1603 | * include the -EINPROGRESS status for such sockets. | |
1604 | */ | |
1605 | ||
1606 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, | |
1607 | int, addrlen) | |
1608 | { | |
1609 | struct socket *sock; | |
1610 | struct sockaddr_storage address; | |
1611 | int err, fput_needed; | |
1612 | ||
1613 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1614 | if (!sock) | |
1615 | goto out; | |
1616 | err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address); | |
1617 | if (err < 0) | |
1618 | goto out_put; | |
1619 | ||
1620 | err = | |
1621 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); | |
1622 | if (err) | |
1623 | goto out_put; | |
1624 | ||
1625 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, | |
1626 | sock->file->f_flags); | |
1627 | out_put: | |
1628 | fput_light(sock->file, fput_needed); | |
1629 | out: | |
1630 | return err; | |
1631 | } | |
1632 | ||
1633 | /* | |
1634 | * Get the local address ('name') of a socket object. Move the obtained | |
1635 | * name to user space. | |
1636 | */ | |
1637 | ||
1638 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, | |
1639 | int __user *, usockaddr_len) | |
1640 | { | |
1641 | struct socket *sock; | |
1642 | struct sockaddr_storage address; | |
1643 | int len, err, fput_needed; | |
1644 | ||
1645 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1646 | if (!sock) | |
1647 | goto out; | |
1648 | ||
1649 | err = security_socket_getsockname(sock); | |
1650 | if (err) | |
1651 | goto out_put; | |
1652 | ||
1653 | err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); | |
1654 | if (err) | |
1655 | goto out_put; | |
1656 | err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len); | |
1657 | ||
1658 | out_put: | |
1659 | fput_light(sock->file, fput_needed); | |
1660 | out: | |
1661 | return err; | |
1662 | } | |
1663 | ||
1664 | /* | |
1665 | * Get the remote address ('name') of a socket object. Move the obtained | |
1666 | * name to user space. | |
1667 | */ | |
1668 | ||
1669 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, | |
1670 | int __user *, usockaddr_len) | |
1671 | { | |
1672 | struct socket *sock; | |
1673 | struct sockaddr_storage address; | |
1674 | int len, err, fput_needed; | |
1675 | ||
1676 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1677 | if (sock != NULL) { | |
1678 | err = security_socket_getpeername(sock); | |
1679 | if (err) { | |
1680 | fput_light(sock->file, fput_needed); | |
1681 | return err; | |
1682 | } | |
1683 | ||
1684 | err = | |
1685 | sock->ops->getname(sock, (struct sockaddr *)&address, &len, | |
1686 | 1); | |
1687 | if (!err) | |
1688 | err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, | |
1689 | usockaddr_len); | |
1690 | fput_light(sock->file, fput_needed); | |
1691 | } | |
1692 | return err; | |
1693 | } | |
1694 | ||
1695 | /* | |
1696 | * Send a datagram to a given address. We move the address into kernel | |
1697 | * space and check the user space data area is readable before invoking | |
1698 | * the protocol. | |
1699 | */ | |
1700 | ||
1701 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, | |
1702 | unsigned, flags, struct sockaddr __user *, addr, | |
1703 | int, addr_len) | |
1704 | { | |
1705 | struct socket *sock; | |
1706 | struct sockaddr_storage address; | |
1707 | int err; | |
1708 | struct msghdr msg; | |
1709 | struct iovec iov; | |
1710 | int fput_needed; | |
1711 | ||
1712 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1713 | if (!sock) | |
1714 | goto out; | |
1715 | ||
1716 | iov.iov_base = buff; | |
1717 | iov.iov_len = len; | |
1718 | msg.msg_name = NULL; | |
1719 | msg.msg_iov = &iov; | |
1720 | msg.msg_iovlen = 1; | |
1721 | msg.msg_control = NULL; | |
1722 | msg.msg_controllen = 0; | |
1723 | msg.msg_namelen = 0; | |
1724 | if (addr) { | |
1725 | err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address); | |
1726 | if (err < 0) | |
1727 | goto out_put; | |
1728 | msg.msg_name = (struct sockaddr *)&address; | |
1729 | msg.msg_namelen = addr_len; | |
1730 | } | |
1731 | if (sock->file->f_flags & O_NONBLOCK) | |
1732 | flags |= MSG_DONTWAIT; | |
1733 | msg.msg_flags = flags; | |
1734 | err = sock_sendmsg(sock, &msg, len); | |
1735 | ||
1736 | out_put: | |
1737 | fput_light(sock->file, fput_needed); | |
1738 | out: | |
1739 | return err; | |
1740 | } | |
1741 | ||
1742 | /* | |
1743 | * Send a datagram down a socket. | |
1744 | */ | |
1745 | ||
1746 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, | |
1747 | unsigned, flags) | |
1748 | { | |
1749 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * Receive a frame from the socket and optionally record the address of the | |
1754 | * sender. We verify the buffers are writable and if needed move the | |
1755 | * sender address from kernel to user space. | |
1756 | */ | |
1757 | ||
1758 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, | |
1759 | unsigned, flags, struct sockaddr __user *, addr, | |
1760 | int __user *, addr_len) | |
1761 | { | |
1762 | struct socket *sock; | |
1763 | struct iovec iov; | |
1764 | struct msghdr msg; | |
1765 | struct sockaddr_storage address; | |
1766 | int err, err2; | |
1767 | int fput_needed; | |
1768 | ||
1769 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1770 | if (!sock) | |
1771 | goto out; | |
1772 | ||
1773 | msg.msg_control = NULL; | |
1774 | msg.msg_controllen = 0; | |
1775 | msg.msg_iovlen = 1; | |
1776 | msg.msg_iov = &iov; | |
1777 | iov.iov_len = size; | |
1778 | iov.iov_base = ubuf; | |
1779 | msg.msg_name = (struct sockaddr *)&address; | |
1780 | msg.msg_namelen = sizeof(address); | |
1781 | if (sock->file->f_flags & O_NONBLOCK) | |
1782 | flags |= MSG_DONTWAIT; | |
1783 | err = sock_recvmsg(sock, &msg, size, flags); | |
1784 | ||
1785 | if (err >= 0 && addr != NULL) { | |
1786 | err2 = move_addr_to_user((struct sockaddr *)&address, | |
1787 | msg.msg_namelen, addr, addr_len); | |
1788 | if (err2 < 0) | |
1789 | err = err2; | |
1790 | } | |
1791 | ||
1792 | fput_light(sock->file, fput_needed); | |
1793 | out: | |
1794 | return err; | |
1795 | } | |
1796 | ||
1797 | /* | |
1798 | * Receive a datagram from a socket. | |
1799 | */ | |
1800 | ||
1801 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, | |
1802 | unsigned flags) | |
1803 | { | |
1804 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1805 | } | |
1806 | ||
1807 | /* | |
1808 | * Set a socket option. Because we don't know the option lengths we have | |
1809 | * to pass the user mode parameter for the protocols to sort out. | |
1810 | */ | |
1811 | ||
1812 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, | |
1813 | char __user *, optval, int, optlen) | |
1814 | { | |
1815 | int err, fput_needed; | |
1816 | struct socket *sock; | |
1817 | ||
1818 | if (optlen < 0) | |
1819 | return -EINVAL; | |
1820 | ||
1821 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1822 | if (sock != NULL) { | |
1823 | err = security_socket_setsockopt(sock, level, optname); | |
1824 | if (err) | |
1825 | goto out_put; | |
1826 | ||
1827 | if (level == SOL_SOCKET) | |
1828 | err = | |
1829 | sock_setsockopt(sock, level, optname, optval, | |
1830 | optlen); | |
1831 | else | |
1832 | err = | |
1833 | sock->ops->setsockopt(sock, level, optname, optval, | |
1834 | optlen); | |
1835 | out_put: | |
1836 | fput_light(sock->file, fput_needed); | |
1837 | } | |
1838 | return err; | |
1839 | } | |
1840 | ||
1841 | /* | |
1842 | * Get a socket option. Because we don't know the option lengths we have | |
1843 | * to pass a user mode parameter for the protocols to sort out. | |
1844 | */ | |
1845 | ||
1846 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, | |
1847 | char __user *, optval, int __user *, optlen) | |
1848 | { | |
1849 | int err, fput_needed; | |
1850 | struct socket *sock; | |
1851 | ||
1852 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1853 | if (sock != NULL) { | |
1854 | err = security_socket_getsockopt(sock, level, optname); | |
1855 | if (err) | |
1856 | goto out_put; | |
1857 | ||
1858 | if (level == SOL_SOCKET) | |
1859 | err = | |
1860 | sock_getsockopt(sock, level, optname, optval, | |
1861 | optlen); | |
1862 | else | |
1863 | err = | |
1864 | sock->ops->getsockopt(sock, level, optname, optval, | |
1865 | optlen); | |
1866 | out_put: | |
1867 | fput_light(sock->file, fput_needed); | |
1868 | } | |
1869 | return err; | |
1870 | } | |
1871 | ||
1872 | /* | |
1873 | * Shutdown a socket. | |
1874 | */ | |
1875 | ||
1876 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) | |
1877 | { | |
1878 | int err, fput_needed; | |
1879 | struct socket *sock; | |
1880 | ||
1881 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1882 | if (sock != NULL) { | |
1883 | err = security_socket_shutdown(sock, how); | |
1884 | if (!err) | |
1885 | err = sock->ops->shutdown(sock, how); | |
1886 | fput_light(sock->file, fput_needed); | |
1887 | } | |
1888 | return err; | |
1889 | } | |
1890 | ||
1891 | /* A couple of helpful macros for getting the address of the 32/64 bit | |
1892 | * fields which are the same type (int / unsigned) on our platforms. | |
1893 | */ | |
1894 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1895 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1896 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1897 | ||
1898 | /* | |
1899 | * BSD sendmsg interface | |
1900 | */ | |
1901 | ||
1902 | SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags) | |
1903 | { | |
1904 | struct compat_msghdr __user *msg_compat = | |
1905 | (struct compat_msghdr __user *)msg; | |
1906 | struct socket *sock; | |
1907 | struct sockaddr_storage address; | |
1908 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1909 | unsigned char ctl[sizeof(struct cmsghdr) + 20] | |
1910 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); | |
1911 | /* 20 is size of ipv6_pktinfo */ | |
1912 | unsigned char *ctl_buf = ctl; | |
1913 | struct msghdr msg_sys; | |
1914 | int err, ctl_len, iov_size, total_len; | |
1915 | int fput_needed; | |
1916 | ||
1917 | err = -EFAULT; | |
1918 | if (MSG_CMSG_COMPAT & flags) { | |
1919 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1920 | return -EFAULT; | |
1921 | } | |
1922 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1923 | return -EFAULT; | |
1924 | ||
1925 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1926 | if (!sock) | |
1927 | goto out; | |
1928 | ||
1929 | /* do not move before msg_sys is valid */ | |
1930 | err = -EMSGSIZE; | |
1931 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1932 | goto out_put; | |
1933 | ||
1934 | /* Check whether to allocate the iovec area */ | |
1935 | err = -ENOMEM; | |
1936 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1937 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1938 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1939 | if (!iov) | |
1940 | goto out_put; | |
1941 | } | |
1942 | ||
1943 | /* This will also move the address data into kernel space */ | |
1944 | if (MSG_CMSG_COMPAT & flags) { | |
1945 | err = verify_compat_iovec(&msg_sys, iov, | |
1946 | (struct sockaddr *)&address, | |
1947 | VERIFY_READ); | |
1948 | } else | |
1949 | err = verify_iovec(&msg_sys, iov, | |
1950 | (struct sockaddr *)&address, | |
1951 | VERIFY_READ); | |
1952 | if (err < 0) | |
1953 | goto out_freeiov; | |
1954 | total_len = err; | |
1955 | ||
1956 | err = -ENOBUFS; | |
1957 | ||
1958 | if (msg_sys.msg_controllen > INT_MAX) | |
1959 | goto out_freeiov; | |
1960 | ctl_len = msg_sys.msg_controllen; | |
1961 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { | |
1962 | err = | |
1963 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, | |
1964 | sizeof(ctl)); | |
1965 | if (err) | |
1966 | goto out_freeiov; | |
1967 | ctl_buf = msg_sys.msg_control; | |
1968 | ctl_len = msg_sys.msg_controllen; | |
1969 | } else if (ctl_len) { | |
1970 | if (ctl_len > sizeof(ctl)) { | |
1971 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); | |
1972 | if (ctl_buf == NULL) | |
1973 | goto out_freeiov; | |
1974 | } | |
1975 | err = -EFAULT; | |
1976 | /* | |
1977 | * Careful! Before this, msg_sys.msg_control contains a user pointer. | |
1978 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1979 | * checking falls down on this. | |
1980 | */ | |
1981 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, | |
1982 | ctl_len)) | |
1983 | goto out_freectl; | |
1984 | msg_sys.msg_control = ctl_buf; | |
1985 | } | |
1986 | msg_sys.msg_flags = flags; | |
1987 | ||
1988 | if (sock->file->f_flags & O_NONBLOCK) | |
1989 | msg_sys.msg_flags |= MSG_DONTWAIT; | |
1990 | err = sock_sendmsg(sock, &msg_sys, total_len); | |
1991 | ||
1992 | out_freectl: | |
1993 | if (ctl_buf != ctl) | |
1994 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); | |
1995 | out_freeiov: | |
1996 | if (iov != iovstack) | |
1997 | sock_kfree_s(sock->sk, iov, iov_size); | |
1998 | out_put: | |
1999 | fput_light(sock->file, fput_needed); | |
2000 | out: | |
2001 | return err; | |
2002 | } | |
2003 | ||
2004 | static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg, | |
2005 | struct msghdr *msg_sys, unsigned flags, int nosec) | |
2006 | { | |
2007 | struct compat_msghdr __user *msg_compat = | |
2008 | (struct compat_msghdr __user *)msg; | |
2009 | struct iovec iovstack[UIO_FASTIOV]; | |
2010 | struct iovec *iov = iovstack; | |
2011 | unsigned long cmsg_ptr; | |
2012 | int err, iov_size, total_len, len; | |
2013 | ||
2014 | /* kernel mode address */ | |
2015 | struct sockaddr_storage addr; | |
2016 | ||
2017 | /* user mode address pointers */ | |
2018 | struct sockaddr __user *uaddr; | |
2019 | int __user *uaddr_len; | |
2020 | ||
2021 | if (MSG_CMSG_COMPAT & flags) { | |
2022 | if (get_compat_msghdr(msg_sys, msg_compat)) | |
2023 | return -EFAULT; | |
2024 | } | |
2025 | else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr))) | |
2026 | return -EFAULT; | |
2027 | ||
2028 | err = -EMSGSIZE; | |
2029 | if (msg_sys->msg_iovlen > UIO_MAXIOV) | |
2030 | goto out; | |
2031 | ||
2032 | /* Check whether to allocate the iovec area */ | |
2033 | err = -ENOMEM; | |
2034 | iov_size = msg_sys->msg_iovlen * sizeof(struct iovec); | |
2035 | if (msg_sys->msg_iovlen > UIO_FASTIOV) { | |
2036 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
2037 | if (!iov) | |
2038 | goto out; | |
2039 | } | |
2040 | ||
2041 | /* | |
2042 | * Save the user-mode address (verify_iovec will change the | |
2043 | * kernel msghdr to use the kernel address space) | |
2044 | */ | |
2045 | ||
2046 | uaddr = (__force void __user *)msg_sys->msg_name; | |
2047 | uaddr_len = COMPAT_NAMELEN(msg); | |
2048 | if (MSG_CMSG_COMPAT & flags) { | |
2049 | err = verify_compat_iovec(msg_sys, iov, | |
2050 | (struct sockaddr *)&addr, | |
2051 | VERIFY_WRITE); | |
2052 | } else | |
2053 | err = verify_iovec(msg_sys, iov, | |
2054 | (struct sockaddr *)&addr, | |
2055 | VERIFY_WRITE); | |
2056 | if (err < 0) | |
2057 | goto out_freeiov; | |
2058 | total_len = err; | |
2059 | ||
2060 | cmsg_ptr = (unsigned long)msg_sys->msg_control; | |
2061 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
2062 | ||
2063 | if (sock->file->f_flags & O_NONBLOCK) | |
2064 | flags |= MSG_DONTWAIT; | |
2065 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, | |
2066 | total_len, flags); | |
2067 | if (err < 0) | |
2068 | goto out_freeiov; | |
2069 | len = err; | |
2070 | ||
2071 | if (uaddr != NULL) { | |
2072 | err = move_addr_to_user((struct sockaddr *)&addr, | |
2073 | msg_sys->msg_namelen, uaddr, | |
2074 | uaddr_len); | |
2075 | if (err < 0) | |
2076 | goto out_freeiov; | |
2077 | } | |
2078 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), | |
2079 | COMPAT_FLAGS(msg)); | |
2080 | if (err) | |
2081 | goto out_freeiov; | |
2082 | if (MSG_CMSG_COMPAT & flags) | |
2083 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2084 | &msg_compat->msg_controllen); | |
2085 | else | |
2086 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2087 | &msg->msg_controllen); | |
2088 | if (err) | |
2089 | goto out_freeiov; | |
2090 | err = len; | |
2091 | ||
2092 | out_freeiov: | |
2093 | if (iov != iovstack) | |
2094 | sock_kfree_s(sock->sk, iov, iov_size); | |
2095 | out: | |
2096 | return err; | |
2097 | } | |
2098 | ||
2099 | /* | |
2100 | * BSD recvmsg interface | |
2101 | */ | |
2102 | ||
2103 | SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg, | |
2104 | unsigned int, flags) | |
2105 | { | |
2106 | int fput_needed, err; | |
2107 | struct msghdr msg_sys; | |
2108 | struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2109 | ||
2110 | if (!sock) | |
2111 | goto out; | |
2112 | ||
2113 | err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0); | |
2114 | ||
2115 | fput_light(sock->file, fput_needed); | |
2116 | out: | |
2117 | return err; | |
2118 | } | |
2119 | ||
2120 | /* | |
2121 | * Linux recvmmsg interface | |
2122 | */ | |
2123 | ||
2124 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
2125 | unsigned int flags, struct timespec *timeout) | |
2126 | { | |
2127 | int fput_needed, err, datagrams; | |
2128 | struct socket *sock; | |
2129 | struct mmsghdr __user *entry; | |
2130 | struct msghdr msg_sys; | |
2131 | struct timespec end_time; | |
2132 | ||
2133 | if (timeout && | |
2134 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2135 | timeout->tv_nsec)) | |
2136 | return -EINVAL; | |
2137 | ||
2138 | datagrams = 0; | |
2139 | ||
2140 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2141 | if (!sock) | |
2142 | return err; | |
2143 | ||
2144 | err = sock_error(sock->sk); | |
2145 | if (err) | |
2146 | goto out_put; | |
2147 | ||
2148 | entry = mmsg; | |
2149 | ||
2150 | while (datagrams < vlen) { | |
2151 | /* | |
2152 | * No need to ask LSM for more than the first datagram. | |
2153 | */ | |
2154 | err = __sys_recvmsg(sock, (struct msghdr __user *)entry, | |
2155 | &msg_sys, flags, datagrams); | |
2156 | if (err < 0) | |
2157 | break; | |
2158 | err = put_user(err, &entry->msg_len); | |
2159 | if (err) | |
2160 | break; | |
2161 | ++entry; | |
2162 | ++datagrams; | |
2163 | ||
2164 | if (timeout) { | |
2165 | ktime_get_ts(timeout); | |
2166 | *timeout = timespec_sub(end_time, *timeout); | |
2167 | if (timeout->tv_sec < 0) { | |
2168 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2169 | break; | |
2170 | } | |
2171 | ||
2172 | /* Timeout, return less than vlen datagrams */ | |
2173 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2174 | break; | |
2175 | } | |
2176 | ||
2177 | /* Out of band data, return right away */ | |
2178 | if (msg_sys.msg_flags & MSG_OOB) | |
2179 | break; | |
2180 | } | |
2181 | ||
2182 | out_put: | |
2183 | fput_light(sock->file, fput_needed); | |
2184 | ||
2185 | if (err == 0) | |
2186 | return datagrams; | |
2187 | ||
2188 | if (datagrams != 0) { | |
2189 | /* | |
2190 | * We may return less entries than requested (vlen) if the | |
2191 | * sock is non block and there aren't enough datagrams... | |
2192 | */ | |
2193 | if (err != -EAGAIN) { | |
2194 | /* | |
2195 | * ... or if recvmsg returns an error after we | |
2196 | * received some datagrams, where we record the | |
2197 | * error to return on the next call or if the | |
2198 | * app asks about it using getsockopt(SO_ERROR). | |
2199 | */ | |
2200 | sock->sk->sk_err = -err; | |
2201 | } | |
2202 | ||
2203 | return datagrams; | |
2204 | } | |
2205 | ||
2206 | return err; | |
2207 | } | |
2208 | ||
2209 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2210 | unsigned int, vlen, unsigned int, flags, | |
2211 | struct timespec __user *, timeout) | |
2212 | { | |
2213 | int datagrams; | |
2214 | struct timespec timeout_sys; | |
2215 | ||
2216 | if (!timeout) | |
2217 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2218 | ||
2219 | if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) | |
2220 | return -EFAULT; | |
2221 | ||
2222 | datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
2223 | ||
2224 | if (datagrams > 0 && | |
2225 | copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) | |
2226 | datagrams = -EFAULT; | |
2227 | ||
2228 | return datagrams; | |
2229 | } | |
2230 | ||
2231 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
2232 | /* Argument list sizes for sys_socketcall */ | |
2233 | #define AL(x) ((x) * sizeof(unsigned long)) | |
2234 | static const unsigned char nargs[20] = { | |
2235 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), | |
2236 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), | |
2237 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3), | |
2238 | AL(4),AL(5) | |
2239 | }; | |
2240 | ||
2241 | #undef AL | |
2242 | ||
2243 | /* | |
2244 | * System call vectors. | |
2245 | * | |
2246 | * Argument checking cleaned up. Saved 20% in size. | |
2247 | * This function doesn't need to set the kernel lock because | |
2248 | * it is set by the callees. | |
2249 | */ | |
2250 | ||
2251 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) | |
2252 | { | |
2253 | unsigned long a[6]; | |
2254 | unsigned long a0, a1; | |
2255 | int err; | |
2256 | unsigned int len; | |
2257 | ||
2258 | if (call < 1 || call > SYS_RECVMMSG) | |
2259 | return -EINVAL; | |
2260 | ||
2261 | len = nargs[call]; | |
2262 | if (len > sizeof(a)) | |
2263 | return -EINVAL; | |
2264 | ||
2265 | /* copy_from_user should be SMP safe. */ | |
2266 | if (copy_from_user(a, args, len)) | |
2267 | return -EFAULT; | |
2268 | ||
2269 | audit_socketcall(nargs[call] / sizeof(unsigned long), a); | |
2270 | ||
2271 | a0 = a[0]; | |
2272 | a1 = a[1]; | |
2273 | ||
2274 | switch (call) { | |
2275 | case SYS_SOCKET: | |
2276 | err = sys_socket(a0, a1, a[2]); | |
2277 | break; | |
2278 | case SYS_BIND: | |
2279 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2280 | break; | |
2281 | case SYS_CONNECT: | |
2282 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2283 | break; | |
2284 | case SYS_LISTEN: | |
2285 | err = sys_listen(a0, a1); | |
2286 | break; | |
2287 | case SYS_ACCEPT: | |
2288 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2289 | (int __user *)a[2], 0); | |
2290 | break; | |
2291 | case SYS_GETSOCKNAME: | |
2292 | err = | |
2293 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2294 | (int __user *)a[2]); | |
2295 | break; | |
2296 | case SYS_GETPEERNAME: | |
2297 | err = | |
2298 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2299 | (int __user *)a[2]); | |
2300 | break; | |
2301 | case SYS_SOCKETPAIR: | |
2302 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2303 | break; | |
2304 | case SYS_SEND: | |
2305 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2306 | break; | |
2307 | case SYS_SENDTO: | |
2308 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2309 | (struct sockaddr __user *)a[4], a[5]); | |
2310 | break; | |
2311 | case SYS_RECV: | |
2312 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2313 | break; | |
2314 | case SYS_RECVFROM: | |
2315 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2316 | (struct sockaddr __user *)a[4], | |
2317 | (int __user *)a[5]); | |
2318 | break; | |
2319 | case SYS_SHUTDOWN: | |
2320 | err = sys_shutdown(a0, a1); | |
2321 | break; | |
2322 | case SYS_SETSOCKOPT: | |
2323 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2324 | break; | |
2325 | case SYS_GETSOCKOPT: | |
2326 | err = | |
2327 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2328 | (int __user *)a[4]); | |
2329 | break; | |
2330 | case SYS_SENDMSG: | |
2331 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2332 | break; | |
2333 | case SYS_RECVMSG: | |
2334 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2335 | break; | |
2336 | case SYS_RECVMMSG: | |
2337 | err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], | |
2338 | (struct timespec __user *)a[4]); | |
2339 | break; | |
2340 | case SYS_ACCEPT4: | |
2341 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2342 | (int __user *)a[2], a[3]); | |
2343 | break; | |
2344 | default: | |
2345 | err = -EINVAL; | |
2346 | break; | |
2347 | } | |
2348 | return err; | |
2349 | } | |
2350 | ||
2351 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ | |
2352 | ||
2353 | /** | |
2354 | * sock_register - add a socket protocol handler | |
2355 | * @ops: description of protocol | |
2356 | * | |
2357 | * This function is called by a protocol handler that wants to | |
2358 | * advertise its address family, and have it linked into the | |
2359 | * socket interface. The value ops->family coresponds to the | |
2360 | * socket system call protocol family. | |
2361 | */ | |
2362 | int sock_register(const struct net_proto_family *ops) | |
2363 | { | |
2364 | int err; | |
2365 | ||
2366 | if (ops->family >= NPROTO) { | |
2367 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, | |
2368 | NPROTO); | |
2369 | return -ENOBUFS; | |
2370 | } | |
2371 | ||
2372 | spin_lock(&net_family_lock); | |
2373 | if (net_families[ops->family]) | |
2374 | err = -EEXIST; | |
2375 | else { | |
2376 | net_families[ops->family] = ops; | |
2377 | err = 0; | |
2378 | } | |
2379 | spin_unlock(&net_family_lock); | |
2380 | ||
2381 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); | |
2382 | return err; | |
2383 | } | |
2384 | ||
2385 | /** | |
2386 | * sock_unregister - remove a protocol handler | |
2387 | * @family: protocol family to remove | |
2388 | * | |
2389 | * This function is called by a protocol handler that wants to | |
2390 | * remove its address family, and have it unlinked from the | |
2391 | * new socket creation. | |
2392 | * | |
2393 | * If protocol handler is a module, then it can use module reference | |
2394 | * counts to protect against new references. If protocol handler is not | |
2395 | * a module then it needs to provide its own protection in | |
2396 | * the ops->create routine. | |
2397 | */ | |
2398 | void sock_unregister(int family) | |
2399 | { | |
2400 | BUG_ON(family < 0 || family >= NPROTO); | |
2401 | ||
2402 | spin_lock(&net_family_lock); | |
2403 | net_families[family] = NULL; | |
2404 | spin_unlock(&net_family_lock); | |
2405 | ||
2406 | synchronize_rcu(); | |
2407 | ||
2408 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); | |
2409 | } | |
2410 | ||
2411 | static int __init sock_init(void) | |
2412 | { | |
2413 | /* | |
2414 | * Initialize sock SLAB cache. | |
2415 | */ | |
2416 | ||
2417 | sk_init(); | |
2418 | ||
2419 | /* | |
2420 | * Initialize skbuff SLAB cache | |
2421 | */ | |
2422 | skb_init(); | |
2423 | ||
2424 | /* | |
2425 | * Initialize the protocols module. | |
2426 | */ | |
2427 | ||
2428 | init_inodecache(); | |
2429 | register_filesystem(&sock_fs_type); | |
2430 | sock_mnt = kern_mount(&sock_fs_type); | |
2431 | ||
2432 | /* The real protocol initialization is performed in later initcalls. | |
2433 | */ | |
2434 | ||
2435 | #ifdef CONFIG_NETFILTER | |
2436 | netfilter_init(); | |
2437 | #endif | |
2438 | ||
2439 | return 0; | |
2440 | } | |
2441 | ||
2442 | core_initcall(sock_init); /* early initcall */ | |
2443 | ||
2444 | #ifdef CONFIG_PROC_FS | |
2445 | void socket_seq_show(struct seq_file *seq) | |
2446 | { | |
2447 | int cpu; | |
2448 | int counter = 0; | |
2449 | ||
2450 | for_each_possible_cpu(cpu) | |
2451 | counter += per_cpu(sockets_in_use, cpu); | |
2452 | ||
2453 | /* It can be negative, by the way. 8) */ | |
2454 | if (counter < 0) | |
2455 | counter = 0; | |
2456 | ||
2457 | seq_printf(seq, "sockets: used %d\n", counter); | |
2458 | } | |
2459 | #endif /* CONFIG_PROC_FS */ | |
2460 | ||
2461 | #ifdef CONFIG_COMPAT | |
2462 | static long compat_sock_ioctl(struct file *file, unsigned cmd, | |
2463 | unsigned long arg) | |
2464 | { | |
2465 | struct socket *sock = file->private_data; | |
2466 | int ret = -ENOIOCTLCMD; | |
2467 | struct sock *sk; | |
2468 | struct net *net; | |
2469 | ||
2470 | sk = sock->sk; | |
2471 | net = sock_net(sk); | |
2472 | ||
2473 | if (sock->ops->compat_ioctl) | |
2474 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
2475 | ||
2476 | if (ret == -ENOIOCTLCMD && | |
2477 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
2478 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
2479 | ||
2480 | return ret; | |
2481 | } | |
2482 | #endif | |
2483 | ||
2484 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) | |
2485 | { | |
2486 | return sock->ops->bind(sock, addr, addrlen); | |
2487 | } | |
2488 | ||
2489 | int kernel_listen(struct socket *sock, int backlog) | |
2490 | { | |
2491 | return sock->ops->listen(sock, backlog); | |
2492 | } | |
2493 | ||
2494 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
2495 | { | |
2496 | struct sock *sk = sock->sk; | |
2497 | int err; | |
2498 | ||
2499 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
2500 | newsock); | |
2501 | if (err < 0) | |
2502 | goto done; | |
2503 | ||
2504 | err = sock->ops->accept(sock, *newsock, flags); | |
2505 | if (err < 0) { | |
2506 | sock_release(*newsock); | |
2507 | *newsock = NULL; | |
2508 | goto done; | |
2509 | } | |
2510 | ||
2511 | (*newsock)->ops = sock->ops; | |
2512 | __module_get((*newsock)->ops->owner); | |
2513 | ||
2514 | done: | |
2515 | return err; | |
2516 | } | |
2517 | ||
2518 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
2519 | int flags) | |
2520 | { | |
2521 | return sock->ops->connect(sock, addr, addrlen, flags); | |
2522 | } | |
2523 | ||
2524 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
2525 | int *addrlen) | |
2526 | { | |
2527 | return sock->ops->getname(sock, addr, addrlen, 0); | |
2528 | } | |
2529 | ||
2530 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
2531 | int *addrlen) | |
2532 | { | |
2533 | return sock->ops->getname(sock, addr, addrlen, 1); | |
2534 | } | |
2535 | ||
2536 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
2537 | char *optval, int *optlen) | |
2538 | { | |
2539 | mm_segment_t oldfs = get_fs(); | |
2540 | int err; | |
2541 | ||
2542 | set_fs(KERNEL_DS); | |
2543 | if (level == SOL_SOCKET) | |
2544 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
2545 | else | |
2546 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
2547 | optlen); | |
2548 | set_fs(oldfs); | |
2549 | return err; | |
2550 | } | |
2551 | ||
2552 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
2553 | char *optval, unsigned int optlen) | |
2554 | { | |
2555 | mm_segment_t oldfs = get_fs(); | |
2556 | int err; | |
2557 | ||
2558 | set_fs(KERNEL_DS); | |
2559 | if (level == SOL_SOCKET) | |
2560 | err = sock_setsockopt(sock, level, optname, optval, optlen); | |
2561 | else | |
2562 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
2563 | optlen); | |
2564 | set_fs(oldfs); | |
2565 | return err; | |
2566 | } | |
2567 | ||
2568 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
2569 | size_t size, int flags) | |
2570 | { | |
2571 | if (sock->ops->sendpage) | |
2572 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
2573 | ||
2574 | return sock_no_sendpage(sock, page, offset, size, flags); | |
2575 | } | |
2576 | ||
2577 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
2578 | { | |
2579 | mm_segment_t oldfs = get_fs(); | |
2580 | int err; | |
2581 | ||
2582 | set_fs(KERNEL_DS); | |
2583 | err = sock->ops->ioctl(sock, cmd, arg); | |
2584 | set_fs(oldfs); | |
2585 | ||
2586 | return err; | |
2587 | } | |
2588 | ||
2589 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) | |
2590 | { | |
2591 | return sock->ops->shutdown(sock, how); | |
2592 | } | |
2593 | ||
2594 | EXPORT_SYMBOL(sock_create); | |
2595 | EXPORT_SYMBOL(sock_create_kern); | |
2596 | EXPORT_SYMBOL(sock_create_lite); | |
2597 | EXPORT_SYMBOL(sock_map_fd); | |
2598 | EXPORT_SYMBOL(sock_recvmsg); | |
2599 | EXPORT_SYMBOL(sock_register); | |
2600 | EXPORT_SYMBOL(sock_release); | |
2601 | EXPORT_SYMBOL(sock_sendmsg); | |
2602 | EXPORT_SYMBOL(sock_unregister); | |
2603 | EXPORT_SYMBOL(sock_wake_async); | |
2604 | EXPORT_SYMBOL(sockfd_lookup); | |
2605 | EXPORT_SYMBOL(kernel_sendmsg); | |
2606 | EXPORT_SYMBOL(kernel_recvmsg); | |
2607 | EXPORT_SYMBOL(kernel_bind); | |
2608 | EXPORT_SYMBOL(kernel_listen); | |
2609 | EXPORT_SYMBOL(kernel_accept); | |
2610 | EXPORT_SYMBOL(kernel_connect); | |
2611 | EXPORT_SYMBOL(kernel_getsockname); | |
2612 | EXPORT_SYMBOL(kernel_getpeername); | |
2613 | EXPORT_SYMBOL(kernel_getsockopt); | |
2614 | EXPORT_SYMBOL(kernel_setsockopt); | |
2615 | EXPORT_SYMBOL(kernel_sendpage); | |
2616 | EXPORT_SYMBOL(kernel_sock_ioctl); | |
2617 | EXPORT_SYMBOL(kernel_sock_shutdown); |