Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
02c30a84 | 7 | * Ross Biro |
1da177e4 LT |
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) | |
89bddce5 | 45 | * Tigran Aivazian : Made listen(2) backlog sanity checks |
1da177e4 LT |
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 | |
89bddce5 | 56 | * paradigm. |
1da177e4 LT |
57 | * |
58 | * Based upon Swansea University Computer Society NET3.039 | |
59 | */ | |
60 | ||
1da177e4 | 61 | #include <linux/mm.h> |
1da177e4 LT |
62 | #include <linux/socket.h> |
63 | #include <linux/file.h> | |
64 | #include <linux/net.h> | |
65 | #include <linux/interrupt.h> | |
55737fda | 66 | #include <linux/rcupdate.h> |
1da177e4 LT |
67 | #include <linux/netdevice.h> |
68 | #include <linux/proc_fs.h> | |
69 | #include <linux/seq_file.h> | |
4a3e2f71 | 70 | #include <linux/mutex.h> |
1da177e4 LT |
71 | #include <linux/wanrouter.h> |
72 | #include <linux/if_bridge.h> | |
20380731 ACM |
73 | #include <linux/if_frad.h> |
74 | #include <linux/if_vlan.h> | |
1da177e4 LT |
75 | #include <linux/init.h> |
76 | #include <linux/poll.h> | |
77 | #include <linux/cache.h> | |
78 | #include <linux/module.h> | |
79 | #include <linux/highmem.h> | |
1da177e4 LT |
80 | #include <linux/mount.h> |
81 | #include <linux/security.h> | |
82 | #include <linux/syscalls.h> | |
83 | #include <linux/compat.h> | |
84 | #include <linux/kmod.h> | |
3ec3b2fb | 85 | #include <linux/audit.h> |
d86b5e0e | 86 | #include <linux/wireless.h> |
1b8d7ae4 | 87 | #include <linux/nsproxy.h> |
1da177e4 LT |
88 | |
89 | #include <asm/uaccess.h> | |
90 | #include <asm/unistd.h> | |
91 | ||
92 | #include <net/compat.h> | |
93 | ||
94 | #include <net/sock.h> | |
95 | #include <linux/netfilter.h> | |
96 | ||
97 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); | |
027445c3 BP |
98 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
99 | unsigned long nr_segs, loff_t pos); | |
100 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
101 | unsigned long nr_segs, loff_t pos); | |
89bddce5 | 102 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
1da177e4 LT |
103 | |
104 | static int sock_close(struct inode *inode, struct file *file); | |
105 | static unsigned int sock_poll(struct file *file, | |
106 | struct poll_table_struct *wait); | |
89bddce5 | 107 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
89bbfc95 SP |
108 | #ifdef CONFIG_COMPAT |
109 | static long compat_sock_ioctl(struct file *file, | |
89bddce5 | 110 | unsigned int cmd, unsigned long arg); |
89bbfc95 | 111 | #endif |
1da177e4 | 112 | static int sock_fasync(int fd, struct file *filp, int on); |
1da177e4 LT |
113 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
114 | int offset, size_t size, loff_t *ppos, int more); | |
9c55e01c JA |
115 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
116 | struct pipe_inode_info *pipe, size_t len, | |
117 | unsigned int flags); | |
1da177e4 | 118 | |
1da177e4 LT |
119 | /* |
120 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
121 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
122 | */ | |
123 | ||
da7071d7 | 124 | static const struct file_operations socket_file_ops = { |
1da177e4 LT |
125 | .owner = THIS_MODULE, |
126 | .llseek = no_llseek, | |
127 | .aio_read = sock_aio_read, | |
128 | .aio_write = sock_aio_write, | |
129 | .poll = sock_poll, | |
130 | .unlocked_ioctl = sock_ioctl, | |
89bbfc95 SP |
131 | #ifdef CONFIG_COMPAT |
132 | .compat_ioctl = compat_sock_ioctl, | |
133 | #endif | |
1da177e4 LT |
134 | .mmap = sock_mmap, |
135 | .open = sock_no_open, /* special open code to disallow open via /proc */ | |
136 | .release = sock_close, | |
137 | .fasync = sock_fasync, | |
5274f052 JA |
138 | .sendpage = sock_sendpage, |
139 | .splice_write = generic_splice_sendpage, | |
9c55e01c | 140 | .splice_read = sock_splice_read, |
1da177e4 LT |
141 | }; |
142 | ||
143 | /* | |
144 | * The protocol list. Each protocol is registered in here. | |
145 | */ | |
146 | ||
1da177e4 | 147 | static DEFINE_SPINLOCK(net_family_lock); |
f0fd27d4 | 148 | static const struct net_proto_family *net_families[NPROTO] __read_mostly; |
1da177e4 | 149 | |
1da177e4 LT |
150 | /* |
151 | * Statistics counters of the socket lists | |
152 | */ | |
153 | ||
154 | static DEFINE_PER_CPU(int, sockets_in_use) = 0; | |
155 | ||
156 | /* | |
89bddce5 SH |
157 | * Support routines. |
158 | * Move socket addresses back and forth across the kernel/user | |
159 | * divide and look after the messy bits. | |
1da177e4 LT |
160 | */ |
161 | ||
89bddce5 | 162 | #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - |
1da177e4 LT |
163 | 16 for IP, 16 for IPX, |
164 | 24 for IPv6, | |
89bddce5 | 165 | about 80 for AX.25 |
1da177e4 LT |
166 | must be at least one bigger than |
167 | the AF_UNIX size (see net/unix/af_unix.c | |
89bddce5 | 168 | :unix_mkname()). |
1da177e4 | 169 | */ |
89bddce5 | 170 | |
1da177e4 LT |
171 | /** |
172 | * move_addr_to_kernel - copy a socket address into kernel space | |
173 | * @uaddr: Address in user space | |
174 | * @kaddr: Address in kernel space | |
175 | * @ulen: Length in user space | |
176 | * | |
177 | * The address is copied into kernel space. If the provided address is | |
178 | * too long an error code of -EINVAL is returned. If the copy gives | |
179 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
180 | */ | |
181 | ||
182 | int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) | |
183 | { | |
89bddce5 | 184 | if (ulen < 0 || ulen > MAX_SOCK_ADDR) |
1da177e4 | 185 | return -EINVAL; |
89bddce5 | 186 | if (ulen == 0) |
1da177e4 | 187 | return 0; |
89bddce5 | 188 | if (copy_from_user(kaddr, uaddr, ulen)) |
1da177e4 | 189 | return -EFAULT; |
3ec3b2fb | 190 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
191 | } |
192 | ||
193 | /** | |
194 | * move_addr_to_user - copy an address to user space | |
195 | * @kaddr: kernel space address | |
196 | * @klen: length of address in kernel | |
197 | * @uaddr: user space address | |
198 | * @ulen: pointer to user length field | |
199 | * | |
200 | * The value pointed to by ulen on entry is the buffer length available. | |
201 | * This is overwritten with the buffer space used. -EINVAL is returned | |
202 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
203 | * is returned if either the buffer or the length field are not | |
204 | * accessible. | |
205 | * After copying the data up to the limit the user specifies, the true | |
206 | * length of the data is written over the length limit the user | |
207 | * specified. Zero is returned for a success. | |
208 | */ | |
89bddce5 SH |
209 | |
210 | int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, | |
211 | int __user *ulen) | |
1da177e4 LT |
212 | { |
213 | int err; | |
214 | int len; | |
215 | ||
89bddce5 SH |
216 | err = get_user(len, ulen); |
217 | if (err) | |
1da177e4 | 218 | return err; |
89bddce5 SH |
219 | if (len > klen) |
220 | len = klen; | |
221 | if (len < 0 || len > MAX_SOCK_ADDR) | |
1da177e4 | 222 | return -EINVAL; |
89bddce5 | 223 | if (len) { |
d6fe3945 SG |
224 | if (audit_sockaddr(klen, kaddr)) |
225 | return -ENOMEM; | |
89bddce5 | 226 | if (copy_to_user(uaddr, kaddr, len)) |
1da177e4 LT |
227 | return -EFAULT; |
228 | } | |
229 | /* | |
89bddce5 SH |
230 | * "fromlen shall refer to the value before truncation.." |
231 | * 1003.1g | |
1da177e4 LT |
232 | */ |
233 | return __put_user(klen, ulen); | |
234 | } | |
235 | ||
236 | #define SOCKFS_MAGIC 0x534F434B | |
237 | ||
e18b890b | 238 | static struct kmem_cache *sock_inode_cachep __read_mostly; |
1da177e4 LT |
239 | |
240 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
241 | { | |
242 | struct socket_alloc *ei; | |
89bddce5 | 243 | |
e94b1766 | 244 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
245 | if (!ei) |
246 | return NULL; | |
247 | init_waitqueue_head(&ei->socket.wait); | |
89bddce5 | 248 | |
1da177e4 LT |
249 | ei->socket.fasync_list = NULL; |
250 | ei->socket.state = SS_UNCONNECTED; | |
251 | ei->socket.flags = 0; | |
252 | ei->socket.ops = NULL; | |
253 | ei->socket.sk = NULL; | |
254 | ei->socket.file = NULL; | |
1da177e4 LT |
255 | |
256 | return &ei->vfs_inode; | |
257 | } | |
258 | ||
259 | static void sock_destroy_inode(struct inode *inode) | |
260 | { | |
261 | kmem_cache_free(sock_inode_cachep, | |
262 | container_of(inode, struct socket_alloc, vfs_inode)); | |
263 | } | |
264 | ||
4ba9b9d0 | 265 | static void init_once(struct kmem_cache *cachep, void *foo) |
1da177e4 | 266 | { |
89bddce5 | 267 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
1da177e4 | 268 | |
a35afb83 | 269 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 270 | } |
89bddce5 | 271 | |
1da177e4 LT |
272 | static int init_inodecache(void) |
273 | { | |
274 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
89bddce5 SH |
275 | sizeof(struct socket_alloc), |
276 | 0, | |
277 | (SLAB_HWCACHE_ALIGN | | |
278 | SLAB_RECLAIM_ACCOUNT | | |
279 | SLAB_MEM_SPREAD), | |
20c2df83 | 280 | init_once); |
1da177e4 LT |
281 | if (sock_inode_cachep == NULL) |
282 | return -ENOMEM; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static struct super_operations sockfs_ops = { | |
287 | .alloc_inode = sock_alloc_inode, | |
288 | .destroy_inode =sock_destroy_inode, | |
289 | .statfs = simple_statfs, | |
290 | }; | |
291 | ||
454e2398 | 292 | static int sockfs_get_sb(struct file_system_type *fs_type, |
89bddce5 SH |
293 | int flags, const char *dev_name, void *data, |
294 | struct vfsmount *mnt) | |
1da177e4 | 295 | { |
454e2398 DH |
296 | return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, |
297 | mnt); | |
1da177e4 LT |
298 | } |
299 | ||
ba89966c | 300 | static struct vfsmount *sock_mnt __read_mostly; |
1da177e4 LT |
301 | |
302 | static struct file_system_type sock_fs_type = { | |
303 | .name = "sockfs", | |
304 | .get_sb = sockfs_get_sb, | |
305 | .kill_sb = kill_anon_super, | |
306 | }; | |
89bddce5 | 307 | |
1da177e4 LT |
308 | static int sockfs_delete_dentry(struct dentry *dentry) |
309 | { | |
304e61e6 ED |
310 | /* |
311 | * At creation time, we pretended this dentry was hashed | |
312 | * (by clearing DCACHE_UNHASHED bit in d_flags) | |
313 | * At delete time, we restore the truth : not hashed. | |
314 | * (so that dput() can proceed correctly) | |
315 | */ | |
316 | dentry->d_flags |= DCACHE_UNHASHED; | |
317 | return 0; | |
1da177e4 | 318 | } |
c23fbb6b ED |
319 | |
320 | /* | |
321 | * sockfs_dname() is called from d_path(). | |
322 | */ | |
323 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
324 | { | |
325 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
326 | dentry->d_inode->i_ino); | |
327 | } | |
328 | ||
1da177e4 | 329 | static struct dentry_operations sockfs_dentry_operations = { |
89bddce5 | 330 | .d_delete = sockfs_delete_dentry, |
c23fbb6b | 331 | .d_dname = sockfs_dname, |
1da177e4 LT |
332 | }; |
333 | ||
334 | /* | |
335 | * Obtains the first available file descriptor and sets it up for use. | |
336 | * | |
39d8c1b6 DM |
337 | * These functions create file structures and maps them to fd space |
338 | * of the current process. On success it returns file descriptor | |
1da177e4 LT |
339 | * and file struct implicitly stored in sock->file. |
340 | * Note that another thread may close file descriptor before we return | |
341 | * from this function. We use the fact that now we do not refer | |
342 | * to socket after mapping. If one day we will need it, this | |
343 | * function will increment ref. count on file by 1. | |
344 | * | |
345 | * In any case returned fd MAY BE not valid! | |
346 | * This race condition is unavoidable | |
347 | * with shared fd spaces, we cannot solve it inside kernel, | |
348 | * but we take care of internal coherence yet. | |
349 | */ | |
350 | ||
39d8c1b6 | 351 | static int sock_alloc_fd(struct file **filep) |
1da177e4 LT |
352 | { |
353 | int fd; | |
1da177e4 LT |
354 | |
355 | fd = get_unused_fd(); | |
39d8c1b6 | 356 | if (likely(fd >= 0)) { |
1da177e4 LT |
357 | struct file *file = get_empty_filp(); |
358 | ||
39d8c1b6 DM |
359 | *filep = file; |
360 | if (unlikely(!file)) { | |
1da177e4 | 361 | put_unused_fd(fd); |
39d8c1b6 | 362 | return -ENFILE; |
1da177e4 | 363 | } |
39d8c1b6 DM |
364 | } else |
365 | *filep = NULL; | |
366 | return fd; | |
367 | } | |
1da177e4 | 368 | |
39d8c1b6 DM |
369 | static int sock_attach_fd(struct socket *sock, struct file *file) |
370 | { | |
ce8d2cdf | 371 | struct dentry *dentry; |
c23fbb6b | 372 | struct qstr name = { .name = "" }; |
39d8c1b6 | 373 | |
ce8d2cdf DH |
374 | dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name); |
375 | if (unlikely(!dentry)) | |
39d8c1b6 DM |
376 | return -ENOMEM; |
377 | ||
ce8d2cdf | 378 | dentry->d_op = &sockfs_dentry_operations; |
304e61e6 ED |
379 | /* |
380 | * We dont want to push this dentry into global dentry hash table. | |
381 | * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED | |
382 | * This permits a working /proc/$pid/fd/XXX on sockets | |
383 | */ | |
ce8d2cdf DH |
384 | dentry->d_flags &= ~DCACHE_UNHASHED; |
385 | d_instantiate(dentry, SOCK_INODE(sock)); | |
39d8c1b6 DM |
386 | |
387 | sock->file = file; | |
ce8d2cdf DH |
388 | init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE, |
389 | &socket_file_ops); | |
390 | SOCK_INODE(sock)->i_fop = &socket_file_ops; | |
39d8c1b6 DM |
391 | file->f_flags = O_RDWR; |
392 | file->f_pos = 0; | |
393 | file->private_data = sock; | |
1da177e4 | 394 | |
39d8c1b6 DM |
395 | return 0; |
396 | } | |
397 | ||
398 | int sock_map_fd(struct socket *sock) | |
399 | { | |
400 | struct file *newfile; | |
401 | int fd = sock_alloc_fd(&newfile); | |
402 | ||
403 | if (likely(fd >= 0)) { | |
404 | int err = sock_attach_fd(sock, newfile); | |
405 | ||
406 | if (unlikely(err < 0)) { | |
407 | put_filp(newfile); | |
1da177e4 | 408 | put_unused_fd(fd); |
39d8c1b6 | 409 | return err; |
1da177e4 | 410 | } |
39d8c1b6 | 411 | fd_install(fd, newfile); |
1da177e4 | 412 | } |
1da177e4 LT |
413 | return fd; |
414 | } | |
415 | ||
6cb153ca BL |
416 | static struct socket *sock_from_file(struct file *file, int *err) |
417 | { | |
6cb153ca BL |
418 | if (file->f_op == &socket_file_ops) |
419 | return file->private_data; /* set in sock_map_fd */ | |
420 | ||
23bb80d2 ED |
421 | *err = -ENOTSOCK; |
422 | return NULL; | |
6cb153ca BL |
423 | } |
424 | ||
1da177e4 LT |
425 | /** |
426 | * sockfd_lookup - Go from a file number to its socket slot | |
427 | * @fd: file handle | |
428 | * @err: pointer to an error code return | |
429 | * | |
430 | * The file handle passed in is locked and the socket it is bound | |
431 | * too is returned. If an error occurs the err pointer is overwritten | |
432 | * with a negative errno code and NULL is returned. The function checks | |
433 | * for both invalid handles and passing a handle which is not a socket. | |
434 | * | |
435 | * On a success the socket object pointer is returned. | |
436 | */ | |
437 | ||
438 | struct socket *sockfd_lookup(int fd, int *err) | |
439 | { | |
440 | struct file *file; | |
1da177e4 LT |
441 | struct socket *sock; |
442 | ||
89bddce5 SH |
443 | file = fget(fd); |
444 | if (!file) { | |
1da177e4 LT |
445 | *err = -EBADF; |
446 | return NULL; | |
447 | } | |
89bddce5 | 448 | |
6cb153ca BL |
449 | sock = sock_from_file(file, err); |
450 | if (!sock) | |
1da177e4 | 451 | fput(file); |
6cb153ca BL |
452 | return sock; |
453 | } | |
1da177e4 | 454 | |
6cb153ca BL |
455 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
456 | { | |
457 | struct file *file; | |
458 | struct socket *sock; | |
459 | ||
3672558c | 460 | *err = -EBADF; |
6cb153ca BL |
461 | file = fget_light(fd, fput_needed); |
462 | if (file) { | |
463 | sock = sock_from_file(file, err); | |
464 | if (sock) | |
465 | return sock; | |
466 | fput_light(file, *fput_needed); | |
1da177e4 | 467 | } |
6cb153ca | 468 | return NULL; |
1da177e4 LT |
469 | } |
470 | ||
471 | /** | |
472 | * sock_alloc - allocate a socket | |
89bddce5 | 473 | * |
1da177e4 LT |
474 | * Allocate a new inode and socket object. The two are bound together |
475 | * and initialised. The socket is then returned. If we are out of inodes | |
476 | * NULL is returned. | |
477 | */ | |
478 | ||
479 | static struct socket *sock_alloc(void) | |
480 | { | |
89bddce5 SH |
481 | struct inode *inode; |
482 | struct socket *sock; | |
1da177e4 LT |
483 | |
484 | inode = new_inode(sock_mnt->mnt_sb); | |
485 | if (!inode) | |
486 | return NULL; | |
487 | ||
488 | sock = SOCKET_I(inode); | |
489 | ||
89bddce5 | 490 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
1da177e4 LT |
491 | inode->i_uid = current->fsuid; |
492 | inode->i_gid = current->fsgid; | |
493 | ||
494 | get_cpu_var(sockets_in_use)++; | |
495 | put_cpu_var(sockets_in_use); | |
496 | return sock; | |
497 | } | |
498 | ||
499 | /* | |
500 | * In theory you can't get an open on this inode, but /proc provides | |
501 | * a back door. Remember to keep it shut otherwise you'll let the | |
502 | * creepy crawlies in. | |
503 | */ | |
89bddce5 | 504 | |
1da177e4 LT |
505 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
506 | { | |
507 | return -ENXIO; | |
508 | } | |
509 | ||
4b6f5d20 | 510 | const struct file_operations bad_sock_fops = { |
1da177e4 LT |
511 | .owner = THIS_MODULE, |
512 | .open = sock_no_open, | |
513 | }; | |
514 | ||
515 | /** | |
516 | * sock_release - close a socket | |
517 | * @sock: socket to close | |
518 | * | |
519 | * The socket is released from the protocol stack if it has a release | |
520 | * callback, and the inode is then released if the socket is bound to | |
89bddce5 | 521 | * an inode not a file. |
1da177e4 | 522 | */ |
89bddce5 | 523 | |
1da177e4 LT |
524 | void sock_release(struct socket *sock) |
525 | { | |
526 | if (sock->ops) { | |
527 | struct module *owner = sock->ops->owner; | |
528 | ||
529 | sock->ops->release(sock); | |
530 | sock->ops = NULL; | |
531 | module_put(owner); | |
532 | } | |
533 | ||
534 | if (sock->fasync_list) | |
535 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); | |
536 | ||
537 | get_cpu_var(sockets_in_use)--; | |
538 | put_cpu_var(sockets_in_use); | |
539 | if (!sock->file) { | |
540 | iput(SOCK_INODE(sock)); | |
541 | return; | |
542 | } | |
89bddce5 | 543 | sock->file = NULL; |
1da177e4 LT |
544 | } |
545 | ||
89bddce5 | 546 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
547 | struct msghdr *msg, size_t size) |
548 | { | |
549 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
550 | int err; | |
551 | ||
552 | si->sock = sock; | |
553 | si->scm = NULL; | |
554 | si->msg = msg; | |
555 | si->size = size; | |
556 | ||
557 | err = security_socket_sendmsg(sock, msg, size); | |
558 | if (err) | |
559 | return err; | |
560 | ||
561 | return sock->ops->sendmsg(iocb, sock, msg, size); | |
562 | } | |
563 | ||
564 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | |
565 | { | |
566 | struct kiocb iocb; | |
567 | struct sock_iocb siocb; | |
568 | int ret; | |
569 | ||
570 | init_sync_kiocb(&iocb, NULL); | |
571 | iocb.private = &siocb; | |
572 | ret = __sock_sendmsg(&iocb, sock, msg, size); | |
573 | if (-EIOCBQUEUED == ret) | |
574 | ret = wait_on_sync_kiocb(&iocb); | |
575 | return ret; | |
576 | } | |
577 | ||
578 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
579 | struct kvec *vec, size_t num, size_t size) | |
580 | { | |
581 | mm_segment_t oldfs = get_fs(); | |
582 | int result; | |
583 | ||
584 | set_fs(KERNEL_DS); | |
585 | /* | |
586 | * the following is safe, since for compiler definitions of kvec and | |
587 | * iovec are identical, yielding the same in-core layout and alignment | |
588 | */ | |
89bddce5 | 589 | msg->msg_iov = (struct iovec *)vec; |
1da177e4 LT |
590 | msg->msg_iovlen = num; |
591 | result = sock_sendmsg(sock, msg, size); | |
592 | set_fs(oldfs); | |
593 | return result; | |
594 | } | |
595 | ||
92f37fd2 ED |
596 | /* |
597 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
598 | */ | |
599 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
600 | struct sk_buff *skb) | |
601 | { | |
602 | ktime_t kt = skb->tstamp; | |
603 | ||
604 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
605 | struct timeval tv; | |
606 | /* Race occurred between timestamp enabling and packet | |
607 | receiving. Fill in the current time for now. */ | |
608 | if (kt.tv64 == 0) | |
609 | kt = ktime_get_real(); | |
610 | skb->tstamp = kt; | |
611 | tv = ktime_to_timeval(kt); | |
612 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv); | |
613 | } else { | |
614 | struct timespec ts; | |
615 | /* Race occurred between timestamp enabling and packet | |
616 | receiving. Fill in the current time for now. */ | |
617 | if (kt.tv64 == 0) | |
618 | kt = ktime_get_real(); | |
619 | skb->tstamp = kt; | |
620 | ts = ktime_to_timespec(kt); | |
621 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts); | |
622 | } | |
623 | } | |
624 | ||
7c81fd8b ACM |
625 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
626 | ||
89bddce5 | 627 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
628 | struct msghdr *msg, size_t size, int flags) |
629 | { | |
630 | int err; | |
631 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
632 | ||
633 | si->sock = sock; | |
634 | si->scm = NULL; | |
635 | si->msg = msg; | |
636 | si->size = size; | |
637 | si->flags = flags; | |
638 | ||
639 | err = security_socket_recvmsg(sock, msg, size, flags); | |
640 | if (err) | |
641 | return err; | |
642 | ||
643 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); | |
644 | } | |
645 | ||
89bddce5 | 646 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1da177e4 LT |
647 | size_t size, int flags) |
648 | { | |
649 | struct kiocb iocb; | |
650 | struct sock_iocb siocb; | |
651 | int ret; | |
652 | ||
89bddce5 | 653 | init_sync_kiocb(&iocb, NULL); |
1da177e4 LT |
654 | iocb.private = &siocb; |
655 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); | |
656 | if (-EIOCBQUEUED == ret) | |
657 | ret = wait_on_sync_kiocb(&iocb); | |
658 | return ret; | |
659 | } | |
660 | ||
89bddce5 SH |
661 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
662 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 LT |
663 | { |
664 | mm_segment_t oldfs = get_fs(); | |
665 | int result; | |
666 | ||
667 | set_fs(KERNEL_DS); | |
668 | /* | |
669 | * the following is safe, since for compiler definitions of kvec and | |
670 | * iovec are identical, yielding the same in-core layout and alignment | |
671 | */ | |
89bddce5 | 672 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
1da177e4 LT |
673 | result = sock_recvmsg(sock, msg, size, flags); |
674 | set_fs(oldfs); | |
675 | return result; | |
676 | } | |
677 | ||
678 | static void sock_aio_dtor(struct kiocb *iocb) | |
679 | { | |
680 | kfree(iocb->private); | |
681 | } | |
682 | ||
ce1d4d3e CH |
683 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
684 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 685 | { |
1da177e4 LT |
686 | struct socket *sock; |
687 | int flags; | |
688 | ||
ce1d4d3e CH |
689 | sock = file->private_data; |
690 | ||
691 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
692 | if (more) | |
693 | flags |= MSG_MORE; | |
694 | ||
695 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
696 | } | |
1da177e4 | 697 | |
9c55e01c JA |
698 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
699 | struct pipe_inode_info *pipe, size_t len, | |
700 | unsigned int flags) | |
701 | { | |
702 | struct socket *sock = file->private_data; | |
703 | ||
704 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); | |
705 | } | |
706 | ||
ce1d4d3e | 707 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
89bddce5 | 708 | struct sock_iocb *siocb) |
ce1d4d3e CH |
709 | { |
710 | if (!is_sync_kiocb(iocb)) { | |
711 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); | |
712 | if (!siocb) | |
713 | return NULL; | |
1da177e4 LT |
714 | iocb->ki_dtor = sock_aio_dtor; |
715 | } | |
1da177e4 | 716 | |
ce1d4d3e | 717 | siocb->kiocb = iocb; |
ce1d4d3e CH |
718 | iocb->private = siocb; |
719 | return siocb; | |
1da177e4 LT |
720 | } |
721 | ||
ce1d4d3e | 722 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
723 | struct file *file, const struct iovec *iov, |
724 | unsigned long nr_segs) | |
ce1d4d3e CH |
725 | { |
726 | struct socket *sock = file->private_data; | |
727 | size_t size = 0; | |
728 | int i; | |
1da177e4 | 729 | |
89bddce5 SH |
730 | for (i = 0; i < nr_segs; i++) |
731 | size += iov[i].iov_len; | |
1da177e4 | 732 | |
ce1d4d3e CH |
733 | msg->msg_name = NULL; |
734 | msg->msg_namelen = 0; | |
735 | msg->msg_control = NULL; | |
736 | msg->msg_controllen = 0; | |
89bddce5 | 737 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
738 | msg->msg_iovlen = nr_segs; |
739 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
740 | ||
741 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); | |
742 | } | |
743 | ||
027445c3 BP |
744 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
745 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
746 | { |
747 | struct sock_iocb siocb, *x; | |
748 | ||
1da177e4 LT |
749 | if (pos != 0) |
750 | return -ESPIPE; | |
027445c3 BP |
751 | |
752 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
1da177e4 LT |
753 | return 0; |
754 | ||
027445c3 BP |
755 | |
756 | x = alloc_sock_iocb(iocb, &siocb); | |
ce1d4d3e CH |
757 | if (!x) |
758 | return -ENOMEM; | |
027445c3 | 759 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
760 | } |
761 | ||
ce1d4d3e | 762 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
763 | struct file *file, const struct iovec *iov, |
764 | unsigned long nr_segs) | |
1da177e4 | 765 | { |
ce1d4d3e CH |
766 | struct socket *sock = file->private_data; |
767 | size_t size = 0; | |
768 | int i; | |
1da177e4 | 769 | |
89bddce5 SH |
770 | for (i = 0; i < nr_segs; i++) |
771 | size += iov[i].iov_len; | |
1da177e4 | 772 | |
ce1d4d3e CH |
773 | msg->msg_name = NULL; |
774 | msg->msg_namelen = 0; | |
775 | msg->msg_control = NULL; | |
776 | msg->msg_controllen = 0; | |
89bddce5 | 777 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
778 | msg->msg_iovlen = nr_segs; |
779 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
780 | if (sock->type == SOCK_SEQPACKET) | |
781 | msg->msg_flags |= MSG_EOR; | |
1da177e4 | 782 | |
ce1d4d3e | 783 | return __sock_sendmsg(iocb, sock, msg, size); |
1da177e4 LT |
784 | } |
785 | ||
027445c3 BP |
786 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
787 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
788 | { |
789 | struct sock_iocb siocb, *x; | |
1da177e4 | 790 | |
ce1d4d3e CH |
791 | if (pos != 0) |
792 | return -ESPIPE; | |
027445c3 | 793 | |
027445c3 | 794 | x = alloc_sock_iocb(iocb, &siocb); |
ce1d4d3e CH |
795 | if (!x) |
796 | return -ENOMEM; | |
1da177e4 | 797 | |
027445c3 | 798 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
799 | } |
800 | ||
1da177e4 LT |
801 | /* |
802 | * Atomic setting of ioctl hooks to avoid race | |
803 | * with module unload. | |
804 | */ | |
805 | ||
4a3e2f71 | 806 | static DEFINE_MUTEX(br_ioctl_mutex); |
881d966b | 807 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL; |
1da177e4 | 808 | |
881d966b | 809 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
1da177e4 | 810 | { |
4a3e2f71 | 811 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 812 | br_ioctl_hook = hook; |
4a3e2f71 | 813 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 | 814 | } |
89bddce5 | 815 | |
1da177e4 LT |
816 | EXPORT_SYMBOL(brioctl_set); |
817 | ||
4a3e2f71 | 818 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 819 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 820 | |
881d966b | 821 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 822 | { |
4a3e2f71 | 823 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 824 | vlan_ioctl_hook = hook; |
4a3e2f71 | 825 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 826 | } |
89bddce5 | 827 | |
1da177e4 LT |
828 | EXPORT_SYMBOL(vlan_ioctl_set); |
829 | ||
4a3e2f71 | 830 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
89bddce5 | 831 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1da177e4 | 832 | |
89bddce5 | 833 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 834 | { |
4a3e2f71 | 835 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 836 | dlci_ioctl_hook = hook; |
4a3e2f71 | 837 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 | 838 | } |
89bddce5 | 839 | |
1da177e4 LT |
840 | EXPORT_SYMBOL(dlci_ioctl_set); |
841 | ||
842 | /* | |
843 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
844 | * what to do with it - that's up to the protocol still. | |
845 | */ | |
846 | ||
847 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
848 | { | |
849 | struct socket *sock; | |
881d966b | 850 | struct sock *sk; |
1da177e4 LT |
851 | void __user *argp = (void __user *)arg; |
852 | int pid, err; | |
881d966b | 853 | struct net *net; |
1da177e4 | 854 | |
b69aee04 | 855 | sock = file->private_data; |
881d966b EB |
856 | sk = sock->sk; |
857 | net = sk->sk_net; | |
1da177e4 | 858 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
881d966b | 859 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 860 | } else |
d86b5e0e | 861 | #ifdef CONFIG_WIRELESS_EXT |
1da177e4 | 862 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
881d966b | 863 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 864 | } else |
89bddce5 SH |
865 | #endif /* CONFIG_WIRELESS_EXT */ |
866 | switch (cmd) { | |
1da177e4 LT |
867 | case FIOSETOWN: |
868 | case SIOCSPGRP: | |
869 | err = -EFAULT; | |
870 | if (get_user(pid, (int __user *)argp)) | |
871 | break; | |
872 | err = f_setown(sock->file, pid, 1); | |
873 | break; | |
874 | case FIOGETOWN: | |
875 | case SIOCGPGRP: | |
609d7fa9 | 876 | err = put_user(f_getown(sock->file), |
89bddce5 | 877 | (int __user *)argp); |
1da177e4 LT |
878 | break; |
879 | case SIOCGIFBR: | |
880 | case SIOCSIFBR: | |
881 | case SIOCBRADDBR: | |
882 | case SIOCBRDELBR: | |
883 | err = -ENOPKG; | |
884 | if (!br_ioctl_hook) | |
885 | request_module("bridge"); | |
886 | ||
4a3e2f71 | 887 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 888 | if (br_ioctl_hook) |
881d966b | 889 | err = br_ioctl_hook(net, cmd, argp); |
4a3e2f71 | 890 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
891 | break; |
892 | case SIOCGIFVLAN: | |
893 | case SIOCSIFVLAN: | |
894 | err = -ENOPKG; | |
895 | if (!vlan_ioctl_hook) | |
896 | request_module("8021q"); | |
897 | ||
4a3e2f71 | 898 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 899 | if (vlan_ioctl_hook) |
881d966b | 900 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 901 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 902 | break; |
1da177e4 LT |
903 | case SIOCADDDLCI: |
904 | case SIOCDELDLCI: | |
905 | err = -ENOPKG; | |
906 | if (!dlci_ioctl_hook) | |
907 | request_module("dlci"); | |
908 | ||
909 | if (dlci_ioctl_hook) { | |
4a3e2f71 | 910 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 911 | err = dlci_ioctl_hook(cmd, argp); |
4a3e2f71 | 912 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 LT |
913 | } |
914 | break; | |
915 | default: | |
916 | err = sock->ops->ioctl(sock, cmd, arg); | |
b5e5fa5e CH |
917 | |
918 | /* | |
919 | * If this ioctl is unknown try to hand it down | |
920 | * to the NIC driver. | |
921 | */ | |
922 | if (err == -ENOIOCTLCMD) | |
881d966b | 923 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 924 | break; |
89bddce5 | 925 | } |
1da177e4 LT |
926 | return err; |
927 | } | |
928 | ||
929 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
930 | { | |
931 | int err; | |
932 | struct socket *sock = NULL; | |
89bddce5 | 933 | |
1da177e4 LT |
934 | err = security_socket_create(family, type, protocol, 1); |
935 | if (err) | |
936 | goto out; | |
937 | ||
938 | sock = sock_alloc(); | |
939 | if (!sock) { | |
940 | err = -ENOMEM; | |
941 | goto out; | |
942 | } | |
943 | ||
1da177e4 | 944 | sock->type = type; |
7420ed23 VY |
945 | err = security_socket_post_create(sock, family, type, protocol, 1); |
946 | if (err) | |
947 | goto out_release; | |
948 | ||
1da177e4 LT |
949 | out: |
950 | *res = sock; | |
951 | return err; | |
7420ed23 VY |
952 | out_release: |
953 | sock_release(sock); | |
954 | sock = NULL; | |
955 | goto out; | |
1da177e4 LT |
956 | } |
957 | ||
958 | /* No kernel lock held - perfect */ | |
89bddce5 | 959 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
960 | { |
961 | struct socket *sock; | |
962 | ||
963 | /* | |
89bddce5 | 964 | * We can't return errors to poll, so it's either yes or no. |
1da177e4 | 965 | */ |
b69aee04 | 966 | sock = file->private_data; |
1da177e4 LT |
967 | return sock->ops->poll(file, sock, wait); |
968 | } | |
969 | ||
89bddce5 | 970 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 971 | { |
b69aee04 | 972 | struct socket *sock = file->private_data; |
1da177e4 LT |
973 | |
974 | return sock->ops->mmap(file, sock, vma); | |
975 | } | |
976 | ||
20380731 | 977 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
978 | { |
979 | /* | |
89bddce5 SH |
980 | * It was possible the inode is NULL we were |
981 | * closing an unfinished socket. | |
1da177e4 LT |
982 | */ |
983 | ||
89bddce5 | 984 | if (!inode) { |
1da177e4 LT |
985 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
986 | return 0; | |
987 | } | |
988 | sock_fasync(-1, filp, 0); | |
989 | sock_release(SOCKET_I(inode)); | |
990 | return 0; | |
991 | } | |
992 | ||
993 | /* | |
994 | * Update the socket async list | |
995 | * | |
996 | * Fasync_list locking strategy. | |
997 | * | |
998 | * 1. fasync_list is modified only under process context socket lock | |
999 | * i.e. under semaphore. | |
1000 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
1001 | * or under socket lock. | |
1002 | * 3. fasync_list can be used from softirq context, so that | |
1003 | * modification under socket lock have to be enhanced with | |
1004 | * write_lock_bh(&sk->sk_callback_lock). | |
1005 | * --ANK (990710) | |
1006 | */ | |
1007 | ||
1008 | static int sock_fasync(int fd, struct file *filp, int on) | |
1009 | { | |
89bddce5 | 1010 | struct fasync_struct *fa, *fna = NULL, **prev; |
1da177e4 LT |
1011 | struct socket *sock; |
1012 | struct sock *sk; | |
1013 | ||
89bddce5 | 1014 | if (on) { |
8b3a7005 | 1015 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
89bddce5 | 1016 | if (fna == NULL) |
1da177e4 LT |
1017 | return -ENOMEM; |
1018 | } | |
1019 | ||
b69aee04 | 1020 | sock = filp->private_data; |
1da177e4 | 1021 | |
89bddce5 SH |
1022 | sk = sock->sk; |
1023 | if (sk == NULL) { | |
1da177e4 LT |
1024 | kfree(fna); |
1025 | return -EINVAL; | |
1026 | } | |
1027 | ||
1028 | lock_sock(sk); | |
1029 | ||
89bddce5 | 1030 | prev = &(sock->fasync_list); |
1da177e4 | 1031 | |
89bddce5 SH |
1032 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) |
1033 | if (fa->fa_file == filp) | |
1da177e4 LT |
1034 | break; |
1035 | ||
89bddce5 SH |
1036 | if (on) { |
1037 | if (fa != NULL) { | |
1da177e4 | 1038 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1039 | fa->fa_fd = fd; |
1da177e4 LT |
1040 | write_unlock_bh(&sk->sk_callback_lock); |
1041 | ||
1042 | kfree(fna); | |
1043 | goto out; | |
1044 | } | |
89bddce5 SH |
1045 | fna->fa_file = filp; |
1046 | fna->fa_fd = fd; | |
1047 | fna->magic = FASYNC_MAGIC; | |
1048 | fna->fa_next = sock->fasync_list; | |
1da177e4 | 1049 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1050 | sock->fasync_list = fna; |
1da177e4 | 1051 | write_unlock_bh(&sk->sk_callback_lock); |
89bddce5 SH |
1052 | } else { |
1053 | if (fa != NULL) { | |
1da177e4 | 1054 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1055 | *prev = fa->fa_next; |
1da177e4 LT |
1056 | write_unlock_bh(&sk->sk_callback_lock); |
1057 | kfree(fa); | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | out: | |
1062 | release_sock(sock->sk); | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /* This function may be called only under socket lock or callback_lock */ | |
1067 | ||
1068 | int sock_wake_async(struct socket *sock, int how, int band) | |
1069 | { | |
1070 | if (!sock || !sock->fasync_list) | |
1071 | return -1; | |
89bddce5 | 1072 | switch (how) { |
8d8ad9d7 | 1073 | case SOCK_WAKE_WAITD: |
1da177e4 LT |
1074 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1075 | break; | |
1076 | goto call_kill; | |
8d8ad9d7 | 1077 | case SOCK_WAKE_SPACE: |
1da177e4 LT |
1078 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
1079 | break; | |
1080 | /* fall through */ | |
8d8ad9d7 | 1081 | case SOCK_WAKE_IO: |
89bddce5 | 1082 | call_kill: |
1da177e4 LT |
1083 | __kill_fasync(sock->fasync_list, SIGIO, band); |
1084 | break; | |
8d8ad9d7 | 1085 | case SOCK_WAKE_URG: |
1da177e4 LT |
1086 | __kill_fasync(sock->fasync_list, SIGURG, band); |
1087 | } | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1b8d7ae4 | 1091 | static int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1092 | struct socket **res, int kern) |
1da177e4 LT |
1093 | { |
1094 | int err; | |
1095 | struct socket *sock; | |
55737fda | 1096 | const struct net_proto_family *pf; |
1da177e4 LT |
1097 | |
1098 | /* | |
89bddce5 | 1099 | * Check protocol is in range |
1da177e4 LT |
1100 | */ |
1101 | if (family < 0 || family >= NPROTO) | |
1102 | return -EAFNOSUPPORT; | |
1103 | if (type < 0 || type >= SOCK_MAX) | |
1104 | return -EINVAL; | |
1105 | ||
1106 | /* Compatibility. | |
1107 | ||
1108 | This uglymoron is moved from INET layer to here to avoid | |
1109 | deadlock in module load. | |
1110 | */ | |
1111 | if (family == PF_INET && type == SOCK_PACKET) { | |
89bddce5 | 1112 | static int warned; |
1da177e4 LT |
1113 | if (!warned) { |
1114 | warned = 1; | |
89bddce5 SH |
1115 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1116 | current->comm); | |
1da177e4 LT |
1117 | } |
1118 | family = PF_PACKET; | |
1119 | } | |
1120 | ||
1121 | err = security_socket_create(family, type, protocol, kern); | |
1122 | if (err) | |
1123 | return err; | |
89bddce5 | 1124 | |
55737fda SH |
1125 | /* |
1126 | * Allocate the socket and allow the family to set things up. if | |
1127 | * the protocol is 0, the family is instructed to select an appropriate | |
1128 | * default. | |
1129 | */ | |
1130 | sock = sock_alloc(); | |
1131 | if (!sock) { | |
1132 | if (net_ratelimit()) | |
1133 | printk(KERN_WARNING "socket: no more sockets\n"); | |
1134 | return -ENFILE; /* Not exactly a match, but its the | |
1135 | closest posix thing */ | |
1136 | } | |
1137 | ||
1138 | sock->type = type; | |
1139 | ||
1da177e4 | 1140 | #if defined(CONFIG_KMOD) |
89bddce5 SH |
1141 | /* Attempt to load a protocol module if the find failed. |
1142 | * | |
1143 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1144 | * requested real, full-featured networking support upon configuration. |
1145 | * Otherwise module support will break! | |
1146 | */ | |
55737fda | 1147 | if (net_families[family] == NULL) |
89bddce5 | 1148 | request_module("net-pf-%d", family); |
1da177e4 LT |
1149 | #endif |
1150 | ||
55737fda SH |
1151 | rcu_read_lock(); |
1152 | pf = rcu_dereference(net_families[family]); | |
1153 | err = -EAFNOSUPPORT; | |
1154 | if (!pf) | |
1155 | goto out_release; | |
1da177e4 LT |
1156 | |
1157 | /* | |
1158 | * We will call the ->create function, that possibly is in a loadable | |
1159 | * module, so we have to bump that loadable module refcnt first. | |
1160 | */ | |
55737fda | 1161 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1162 | goto out_release; |
1163 | ||
55737fda SH |
1164 | /* Now protected by module ref count */ |
1165 | rcu_read_unlock(); | |
1166 | ||
1b8d7ae4 | 1167 | err = pf->create(net, sock, protocol); |
55737fda | 1168 | if (err < 0) |
1da177e4 | 1169 | goto out_module_put; |
a79af59e | 1170 | |
1da177e4 LT |
1171 | /* |
1172 | * Now to bump the refcnt of the [loadable] module that owns this | |
1173 | * socket at sock_release time we decrement its refcnt. | |
1174 | */ | |
55737fda SH |
1175 | if (!try_module_get(sock->ops->owner)) |
1176 | goto out_module_busy; | |
1177 | ||
1da177e4 LT |
1178 | /* |
1179 | * Now that we're done with the ->create function, the [loadable] | |
1180 | * module can have its refcnt decremented | |
1181 | */ | |
55737fda | 1182 | module_put(pf->owner); |
7420ed23 VY |
1183 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1184 | if (err) | |
3b185525 | 1185 | goto out_sock_release; |
55737fda | 1186 | *res = sock; |
1da177e4 | 1187 | |
55737fda SH |
1188 | return 0; |
1189 | ||
1190 | out_module_busy: | |
1191 | err = -EAFNOSUPPORT; | |
1da177e4 | 1192 | out_module_put: |
55737fda SH |
1193 | sock->ops = NULL; |
1194 | module_put(pf->owner); | |
1195 | out_sock_release: | |
1da177e4 | 1196 | sock_release(sock); |
55737fda SH |
1197 | return err; |
1198 | ||
1199 | out_release: | |
1200 | rcu_read_unlock(); | |
1201 | goto out_sock_release; | |
1da177e4 LT |
1202 | } |
1203 | ||
1204 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1205 | { | |
1b8d7ae4 | 1206 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1210 | { | |
1b8d7ae4 | 1211 | return __sock_create(&init_net, family, type, protocol, res, 1); |
1da177e4 LT |
1212 | } |
1213 | ||
1214 | asmlinkage long sys_socket(int family, int type, int protocol) | |
1215 | { | |
1216 | int retval; | |
1217 | struct socket *sock; | |
1218 | ||
1219 | retval = sock_create(family, type, protocol, &sock); | |
1220 | if (retval < 0) | |
1221 | goto out; | |
1222 | ||
1223 | retval = sock_map_fd(sock); | |
1224 | if (retval < 0) | |
1225 | goto out_release; | |
1226 | ||
1227 | out: | |
1228 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1229 | return retval; | |
1230 | ||
1231 | out_release: | |
1232 | sock_release(sock); | |
1233 | return retval; | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Create a pair of connected sockets. | |
1238 | */ | |
1239 | ||
89bddce5 SH |
1240 | asmlinkage long sys_socketpair(int family, int type, int protocol, |
1241 | int __user *usockvec) | |
1da177e4 LT |
1242 | { |
1243 | struct socket *sock1, *sock2; | |
1244 | int fd1, fd2, err; | |
db349509 | 1245 | struct file *newfile1, *newfile2; |
1da177e4 LT |
1246 | |
1247 | /* | |
1248 | * Obtain the first socket and check if the underlying protocol | |
1249 | * supports the socketpair call. | |
1250 | */ | |
1251 | ||
1252 | err = sock_create(family, type, protocol, &sock1); | |
1253 | if (err < 0) | |
1254 | goto out; | |
1255 | ||
1256 | err = sock_create(family, type, protocol, &sock2); | |
1257 | if (err < 0) | |
1258 | goto out_release_1; | |
1259 | ||
1260 | err = sock1->ops->socketpair(sock1, sock2); | |
89bddce5 | 1261 | if (err < 0) |
1da177e4 LT |
1262 | goto out_release_both; |
1263 | ||
db349509 | 1264 | fd1 = sock_alloc_fd(&newfile1); |
bf3c23d1 DM |
1265 | if (unlikely(fd1 < 0)) { |
1266 | err = fd1; | |
db349509 | 1267 | goto out_release_both; |
bf3c23d1 | 1268 | } |
1da177e4 | 1269 | |
db349509 AV |
1270 | fd2 = sock_alloc_fd(&newfile2); |
1271 | if (unlikely(fd2 < 0)) { | |
bf3c23d1 | 1272 | err = fd2; |
db349509 AV |
1273 | put_filp(newfile1); |
1274 | put_unused_fd(fd1); | |
1da177e4 | 1275 | goto out_release_both; |
db349509 | 1276 | } |
1da177e4 | 1277 | |
db349509 AV |
1278 | err = sock_attach_fd(sock1, newfile1); |
1279 | if (unlikely(err < 0)) { | |
1280 | goto out_fd2; | |
1281 | } | |
1282 | ||
1283 | err = sock_attach_fd(sock2, newfile2); | |
1284 | if (unlikely(err < 0)) { | |
1285 | fput(newfile1); | |
1286 | goto out_fd1; | |
1287 | } | |
1288 | ||
1289 | err = audit_fd_pair(fd1, fd2); | |
1290 | if (err < 0) { | |
1291 | fput(newfile1); | |
1292 | fput(newfile2); | |
1293 | goto out_fd; | |
1294 | } | |
1da177e4 | 1295 | |
db349509 AV |
1296 | fd_install(fd1, newfile1); |
1297 | fd_install(fd2, newfile2); | |
1da177e4 LT |
1298 | /* fd1 and fd2 may be already another descriptors. |
1299 | * Not kernel problem. | |
1300 | */ | |
1301 | ||
89bddce5 | 1302 | err = put_user(fd1, &usockvec[0]); |
1da177e4 LT |
1303 | if (!err) |
1304 | err = put_user(fd2, &usockvec[1]); | |
1305 | if (!err) | |
1306 | return 0; | |
1307 | ||
1308 | sys_close(fd2); | |
1309 | sys_close(fd1); | |
1310 | return err; | |
1311 | ||
1da177e4 | 1312 | out_release_both: |
89bddce5 | 1313 | sock_release(sock2); |
1da177e4 | 1314 | out_release_1: |
89bddce5 | 1315 | sock_release(sock1); |
1da177e4 LT |
1316 | out: |
1317 | return err; | |
db349509 AV |
1318 | |
1319 | out_fd2: | |
1320 | put_filp(newfile1); | |
1321 | sock_release(sock1); | |
1322 | out_fd1: | |
1323 | put_filp(newfile2); | |
1324 | sock_release(sock2); | |
1325 | out_fd: | |
1326 | put_unused_fd(fd1); | |
1327 | put_unused_fd(fd2); | |
1328 | goto out; | |
1da177e4 LT |
1329 | } |
1330 | ||
1da177e4 LT |
1331 | /* |
1332 | * Bind a name to a socket. Nothing much to do here since it's | |
1333 | * the protocol's responsibility to handle the local address. | |
1334 | * | |
1335 | * We move the socket address to kernel space before we call | |
1336 | * the protocol layer (having also checked the address is ok). | |
1337 | */ | |
1338 | ||
1339 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) | |
1340 | { | |
1341 | struct socket *sock; | |
1342 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1343 | int err, fput_needed; |
1da177e4 | 1344 | |
89bddce5 | 1345 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1346 | if (sock) { |
89bddce5 SH |
1347 | err = move_addr_to_kernel(umyaddr, addrlen, address); |
1348 | if (err >= 0) { | |
1349 | err = security_socket_bind(sock, | |
1350 | (struct sockaddr *)address, | |
1351 | addrlen); | |
6cb153ca BL |
1352 | if (!err) |
1353 | err = sock->ops->bind(sock, | |
89bddce5 SH |
1354 | (struct sockaddr *) |
1355 | address, addrlen); | |
1da177e4 | 1356 | } |
6cb153ca | 1357 | fput_light(sock->file, fput_needed); |
89bddce5 | 1358 | } |
1da177e4 LT |
1359 | return err; |
1360 | } | |
1361 | ||
1da177e4 LT |
1362 | /* |
1363 | * Perform a listen. Basically, we allow the protocol to do anything | |
1364 | * necessary for a listen, and if that works, we mark the socket as | |
1365 | * ready for listening. | |
1366 | */ | |
1367 | ||
1da177e4 LT |
1368 | asmlinkage long sys_listen(int fd, int backlog) |
1369 | { | |
1370 | struct socket *sock; | |
6cb153ca | 1371 | int err, fput_needed; |
b8e1f9b5 | 1372 | int somaxconn; |
89bddce5 SH |
1373 | |
1374 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1375 | if (sock) { | |
b8e1f9b5 PE |
1376 | somaxconn = sock->sk->sk_net->sysctl_somaxconn; |
1377 | if ((unsigned)backlog > somaxconn) | |
1378 | backlog = somaxconn; | |
1da177e4 LT |
1379 | |
1380 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1381 | if (!err) |
1382 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1383 | |
6cb153ca | 1384 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1385 | } |
1386 | return err; | |
1387 | } | |
1388 | ||
1da177e4 LT |
1389 | /* |
1390 | * For accept, we attempt to create a new socket, set up the link | |
1391 | * with the client, wake up the client, then return the new | |
1392 | * connected fd. We collect the address of the connector in kernel | |
1393 | * space and move it to user at the very end. This is unclean because | |
1394 | * we open the socket then return an error. | |
1395 | * | |
1396 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1397 | * status to recvmsg. We need to add that support in a way thats | |
1398 | * clean when we restucture accept also. | |
1399 | */ | |
1400 | ||
89bddce5 SH |
1401 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, |
1402 | int __user *upeer_addrlen) | |
1da177e4 LT |
1403 | { |
1404 | struct socket *sock, *newsock; | |
39d8c1b6 | 1405 | struct file *newfile; |
6cb153ca | 1406 | int err, len, newfd, fput_needed; |
1da177e4 LT |
1407 | char address[MAX_SOCK_ADDR]; |
1408 | ||
6cb153ca | 1409 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1410 | if (!sock) |
1411 | goto out; | |
1412 | ||
1413 | err = -ENFILE; | |
89bddce5 | 1414 | if (!(newsock = sock_alloc())) |
1da177e4 LT |
1415 | goto out_put; |
1416 | ||
1417 | newsock->type = sock->type; | |
1418 | newsock->ops = sock->ops; | |
1419 | ||
1da177e4 LT |
1420 | /* |
1421 | * We don't need try_module_get here, as the listening socket (sock) | |
1422 | * has the protocol module (sock->ops->owner) held. | |
1423 | */ | |
1424 | __module_get(newsock->ops->owner); | |
1425 | ||
39d8c1b6 DM |
1426 | newfd = sock_alloc_fd(&newfile); |
1427 | if (unlikely(newfd < 0)) { | |
1428 | err = newfd; | |
9a1875e6 DM |
1429 | sock_release(newsock); |
1430 | goto out_put; | |
39d8c1b6 DM |
1431 | } |
1432 | ||
1433 | err = sock_attach_fd(newsock, newfile); | |
1434 | if (err < 0) | |
79f4f642 | 1435 | goto out_fd_simple; |
39d8c1b6 | 1436 | |
a79af59e FF |
1437 | err = security_socket_accept(sock, newsock); |
1438 | if (err) | |
39d8c1b6 | 1439 | goto out_fd; |
a79af59e | 1440 | |
1da177e4 LT |
1441 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1442 | if (err < 0) | |
39d8c1b6 | 1443 | goto out_fd; |
1da177e4 LT |
1444 | |
1445 | if (upeer_sockaddr) { | |
89bddce5 SH |
1446 | if (newsock->ops->getname(newsock, (struct sockaddr *)address, |
1447 | &len, 2) < 0) { | |
1da177e4 | 1448 | err = -ECONNABORTED; |
39d8c1b6 | 1449 | goto out_fd; |
1da177e4 | 1450 | } |
89bddce5 SH |
1451 | err = move_addr_to_user(address, len, upeer_sockaddr, |
1452 | upeer_addrlen); | |
1da177e4 | 1453 | if (err < 0) |
39d8c1b6 | 1454 | goto out_fd; |
1da177e4 LT |
1455 | } |
1456 | ||
1457 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1458 | ||
39d8c1b6 DM |
1459 | fd_install(newfd, newfile); |
1460 | err = newfd; | |
1da177e4 LT |
1461 | |
1462 | security_socket_post_accept(sock, newsock); | |
1463 | ||
1464 | out_put: | |
6cb153ca | 1465 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1466 | out: |
1467 | return err; | |
79f4f642 AD |
1468 | out_fd_simple: |
1469 | sock_release(newsock); | |
1470 | put_filp(newfile); | |
1471 | put_unused_fd(newfd); | |
1472 | goto out_put; | |
39d8c1b6 | 1473 | out_fd: |
9606a216 | 1474 | fput(newfile); |
39d8c1b6 | 1475 | put_unused_fd(newfd); |
1da177e4 LT |
1476 | goto out_put; |
1477 | } | |
1478 | ||
1da177e4 LT |
1479 | /* |
1480 | * Attempt to connect to a socket with the server address. The address | |
1481 | * is in user space so we verify it is OK and move it to kernel space. | |
1482 | * | |
1483 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1484 | * break bindings | |
1485 | * | |
1486 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1487 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1488 | * include the -EINPROGRESS status for such sockets. | |
1489 | */ | |
1490 | ||
89bddce5 SH |
1491 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, |
1492 | int addrlen) | |
1da177e4 LT |
1493 | { |
1494 | struct socket *sock; | |
1495 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1496 | int err, fput_needed; |
1da177e4 | 1497 | |
6cb153ca | 1498 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1499 | if (!sock) |
1500 | goto out; | |
1501 | err = move_addr_to_kernel(uservaddr, addrlen, address); | |
1502 | if (err < 0) | |
1503 | goto out_put; | |
1504 | ||
89bddce5 SH |
1505 | err = |
1506 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); | |
1da177e4 LT |
1507 | if (err) |
1508 | goto out_put; | |
1509 | ||
89bddce5 | 1510 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
1da177e4 LT |
1511 | sock->file->f_flags); |
1512 | out_put: | |
6cb153ca | 1513 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1514 | out: |
1515 | return err; | |
1516 | } | |
1517 | ||
1518 | /* | |
1519 | * Get the local address ('name') of a socket object. Move the obtained | |
1520 | * name to user space. | |
1521 | */ | |
1522 | ||
89bddce5 SH |
1523 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1524 | int __user *usockaddr_len) | |
1da177e4 LT |
1525 | { |
1526 | struct socket *sock; | |
1527 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1528 | int len, err, fput_needed; |
89bddce5 | 1529 | |
6cb153ca | 1530 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1531 | if (!sock) |
1532 | goto out; | |
1533 | ||
1534 | err = security_socket_getsockname(sock); | |
1535 | if (err) | |
1536 | goto out_put; | |
1537 | ||
1538 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); | |
1539 | if (err) | |
1540 | goto out_put; | |
1541 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); | |
1542 | ||
1543 | out_put: | |
6cb153ca | 1544 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1545 | out: |
1546 | return err; | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * Get the remote address ('name') of a socket object. Move the obtained | |
1551 | * name to user space. | |
1552 | */ | |
1553 | ||
89bddce5 SH |
1554 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1555 | int __user *usockaddr_len) | |
1da177e4 LT |
1556 | { |
1557 | struct socket *sock; | |
1558 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1559 | int len, err, fput_needed; |
1da177e4 | 1560 | |
89bddce5 SH |
1561 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1562 | if (sock != NULL) { | |
1da177e4 LT |
1563 | err = security_socket_getpeername(sock); |
1564 | if (err) { | |
6cb153ca | 1565 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1566 | return err; |
1567 | } | |
1568 | ||
89bddce5 SH |
1569 | err = |
1570 | sock->ops->getname(sock, (struct sockaddr *)address, &len, | |
1571 | 1); | |
1da177e4 | 1572 | if (!err) |
89bddce5 SH |
1573 | err = move_addr_to_user(address, len, usockaddr, |
1574 | usockaddr_len); | |
6cb153ca | 1575 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1576 | } |
1577 | return err; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Send a datagram to a given address. We move the address into kernel | |
1582 | * space and check the user space data area is readable before invoking | |
1583 | * the protocol. | |
1584 | */ | |
1585 | ||
89bddce5 SH |
1586 | asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, |
1587 | unsigned flags, struct sockaddr __user *addr, | |
1588 | int addr_len) | |
1da177e4 LT |
1589 | { |
1590 | struct socket *sock; | |
1591 | char address[MAX_SOCK_ADDR]; | |
1592 | int err; | |
1593 | struct msghdr msg; | |
1594 | struct iovec iov; | |
6cb153ca | 1595 | int fput_needed; |
6cb153ca | 1596 | |
de0fa95c PE |
1597 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1598 | if (!sock) | |
4387ff75 | 1599 | goto out; |
6cb153ca | 1600 | |
89bddce5 SH |
1601 | iov.iov_base = buff; |
1602 | iov.iov_len = len; | |
1603 | msg.msg_name = NULL; | |
1604 | msg.msg_iov = &iov; | |
1605 | msg.msg_iovlen = 1; | |
1606 | msg.msg_control = NULL; | |
1607 | msg.msg_controllen = 0; | |
1608 | msg.msg_namelen = 0; | |
6cb153ca | 1609 | if (addr) { |
1da177e4 LT |
1610 | err = move_addr_to_kernel(addr, addr_len, address); |
1611 | if (err < 0) | |
1612 | goto out_put; | |
89bddce5 SH |
1613 | msg.msg_name = address; |
1614 | msg.msg_namelen = addr_len; | |
1da177e4 LT |
1615 | } |
1616 | if (sock->file->f_flags & O_NONBLOCK) | |
1617 | flags |= MSG_DONTWAIT; | |
1618 | msg.msg_flags = flags; | |
1619 | err = sock_sendmsg(sock, &msg, len); | |
1620 | ||
89bddce5 | 1621 | out_put: |
de0fa95c | 1622 | fput_light(sock->file, fput_needed); |
4387ff75 | 1623 | out: |
1da177e4 LT |
1624 | return err; |
1625 | } | |
1626 | ||
1627 | /* | |
89bddce5 | 1628 | * Send a datagram down a socket. |
1da177e4 LT |
1629 | */ |
1630 | ||
89bddce5 | 1631 | asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) |
1da177e4 LT |
1632 | { |
1633 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1634 | } | |
1635 | ||
1636 | /* | |
89bddce5 | 1637 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
1638 | * sender. We verify the buffers are writable and if needed move the |
1639 | * sender address from kernel to user space. | |
1640 | */ | |
1641 | ||
89bddce5 SH |
1642 | asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, |
1643 | unsigned flags, struct sockaddr __user *addr, | |
1644 | int __user *addr_len) | |
1da177e4 LT |
1645 | { |
1646 | struct socket *sock; | |
1647 | struct iovec iov; | |
1648 | struct msghdr msg; | |
1649 | char address[MAX_SOCK_ADDR]; | |
89bddce5 | 1650 | int err, err2; |
6cb153ca BL |
1651 | int fput_needed; |
1652 | ||
de0fa95c | 1653 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 1654 | if (!sock) |
de0fa95c | 1655 | goto out; |
1da177e4 | 1656 | |
89bddce5 SH |
1657 | msg.msg_control = NULL; |
1658 | msg.msg_controllen = 0; | |
1659 | msg.msg_iovlen = 1; | |
1660 | msg.msg_iov = &iov; | |
1661 | iov.iov_len = size; | |
1662 | iov.iov_base = ubuf; | |
1663 | msg.msg_name = address; | |
1664 | msg.msg_namelen = MAX_SOCK_ADDR; | |
1da177e4 LT |
1665 | if (sock->file->f_flags & O_NONBLOCK) |
1666 | flags |= MSG_DONTWAIT; | |
89bddce5 | 1667 | err = sock_recvmsg(sock, &msg, size, flags); |
1da177e4 | 1668 | |
89bddce5 SH |
1669 | if (err >= 0 && addr != NULL) { |
1670 | err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); | |
1671 | if (err2 < 0) | |
1672 | err = err2; | |
1da177e4 | 1673 | } |
de0fa95c PE |
1674 | |
1675 | fput_light(sock->file, fput_needed); | |
4387ff75 | 1676 | out: |
1da177e4 LT |
1677 | return err; |
1678 | } | |
1679 | ||
1680 | /* | |
89bddce5 | 1681 | * Receive a datagram from a socket. |
1da177e4 LT |
1682 | */ |
1683 | ||
89bddce5 SH |
1684 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
1685 | unsigned flags) | |
1da177e4 LT |
1686 | { |
1687 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1688 | } | |
1689 | ||
1690 | /* | |
1691 | * Set a socket option. Because we don't know the option lengths we have | |
1692 | * to pass the user mode parameter for the protocols to sort out. | |
1693 | */ | |
1694 | ||
89bddce5 SH |
1695 | asmlinkage long sys_setsockopt(int fd, int level, int optname, |
1696 | char __user *optval, int optlen) | |
1da177e4 | 1697 | { |
6cb153ca | 1698 | int err, fput_needed; |
1da177e4 LT |
1699 | struct socket *sock; |
1700 | ||
1701 | if (optlen < 0) | |
1702 | return -EINVAL; | |
89bddce5 SH |
1703 | |
1704 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1705 | if (sock != NULL) { | |
1706 | err = security_socket_setsockopt(sock, level, optname); | |
6cb153ca BL |
1707 | if (err) |
1708 | goto out_put; | |
1da177e4 LT |
1709 | |
1710 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1711 | err = |
1712 | sock_setsockopt(sock, level, optname, optval, | |
1713 | optlen); | |
1da177e4 | 1714 | else |
89bddce5 SH |
1715 | err = |
1716 | sock->ops->setsockopt(sock, level, optname, optval, | |
1717 | optlen); | |
6cb153ca BL |
1718 | out_put: |
1719 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1720 | } |
1721 | return err; | |
1722 | } | |
1723 | ||
1724 | /* | |
1725 | * Get a socket option. Because we don't know the option lengths we have | |
1726 | * to pass a user mode parameter for the protocols to sort out. | |
1727 | */ | |
1728 | ||
89bddce5 SH |
1729 | asmlinkage long sys_getsockopt(int fd, int level, int optname, |
1730 | char __user *optval, int __user *optlen) | |
1da177e4 | 1731 | { |
6cb153ca | 1732 | int err, fput_needed; |
1da177e4 LT |
1733 | struct socket *sock; |
1734 | ||
89bddce5 SH |
1735 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1736 | if (sock != NULL) { | |
6cb153ca BL |
1737 | err = security_socket_getsockopt(sock, level, optname); |
1738 | if (err) | |
1739 | goto out_put; | |
1da177e4 LT |
1740 | |
1741 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1742 | err = |
1743 | sock_getsockopt(sock, level, optname, optval, | |
1744 | optlen); | |
1da177e4 | 1745 | else |
89bddce5 SH |
1746 | err = |
1747 | sock->ops->getsockopt(sock, level, optname, optval, | |
1748 | optlen); | |
6cb153ca BL |
1749 | out_put: |
1750 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1751 | } |
1752 | return err; | |
1753 | } | |
1754 | ||
1da177e4 LT |
1755 | /* |
1756 | * Shutdown a socket. | |
1757 | */ | |
1758 | ||
1759 | asmlinkage long sys_shutdown(int fd, int how) | |
1760 | { | |
6cb153ca | 1761 | int err, fput_needed; |
1da177e4 LT |
1762 | struct socket *sock; |
1763 | ||
89bddce5 SH |
1764 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1765 | if (sock != NULL) { | |
1da177e4 | 1766 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
1767 | if (!err) |
1768 | err = sock->ops->shutdown(sock, how); | |
1769 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1770 | } |
1771 | return err; | |
1772 | } | |
1773 | ||
89bddce5 | 1774 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
1775 | * fields which are the same type (int / unsigned) on our platforms. |
1776 | */ | |
1777 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1778 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1779 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1780 | ||
1da177e4 LT |
1781 | /* |
1782 | * BSD sendmsg interface | |
1783 | */ | |
1784 | ||
1785 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
1786 | { | |
89bddce5 SH |
1787 | struct compat_msghdr __user *msg_compat = |
1788 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1789 | struct socket *sock; |
1790 | char address[MAX_SOCK_ADDR]; | |
1791 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
b9d717a7 | 1792 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
89bddce5 SH |
1793 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
1794 | /* 20 is size of ipv6_pktinfo */ | |
1da177e4 LT |
1795 | unsigned char *ctl_buf = ctl; |
1796 | struct msghdr msg_sys; | |
1797 | int err, ctl_len, iov_size, total_len; | |
6cb153ca | 1798 | int fput_needed; |
89bddce5 | 1799 | |
1da177e4 LT |
1800 | err = -EFAULT; |
1801 | if (MSG_CMSG_COMPAT & flags) { | |
1802 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1803 | return -EFAULT; | |
89bddce5 SH |
1804 | } |
1805 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1da177e4 LT |
1806 | return -EFAULT; |
1807 | ||
6cb153ca | 1808 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
89bddce5 | 1809 | if (!sock) |
1da177e4 LT |
1810 | goto out; |
1811 | ||
1812 | /* do not move before msg_sys is valid */ | |
1813 | err = -EMSGSIZE; | |
1814 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1815 | goto out_put; | |
1816 | ||
89bddce5 | 1817 | /* Check whether to allocate the iovec area */ |
1da177e4 LT |
1818 | err = -ENOMEM; |
1819 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1820 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1821 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1822 | if (!iov) | |
1823 | goto out_put; | |
1824 | } | |
1825 | ||
1826 | /* This will also move the address data into kernel space */ | |
1827 | if (MSG_CMSG_COMPAT & flags) { | |
1828 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); | |
1829 | } else | |
1830 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); | |
89bddce5 | 1831 | if (err < 0) |
1da177e4 LT |
1832 | goto out_freeiov; |
1833 | total_len = err; | |
1834 | ||
1835 | err = -ENOBUFS; | |
1836 | ||
1837 | if (msg_sys.msg_controllen > INT_MAX) | |
1838 | goto out_freeiov; | |
89bddce5 | 1839 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1840 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 SH |
1841 | err = |
1842 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, | |
1843 | sizeof(ctl)); | |
1da177e4 LT |
1844 | if (err) |
1845 | goto out_freeiov; | |
1846 | ctl_buf = msg_sys.msg_control; | |
8920e8f9 | 1847 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1848 | } else if (ctl_len) { |
89bddce5 | 1849 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 1850 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 1851 | if (ctl_buf == NULL) |
1da177e4 LT |
1852 | goto out_freeiov; |
1853 | } | |
1854 | err = -EFAULT; | |
1855 | /* | |
1856 | * Careful! Before this, msg_sys.msg_control contains a user pointer. | |
1857 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1858 | * checking falls down on this. | |
1859 | */ | |
89bddce5 SH |
1860 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, |
1861 | ctl_len)) | |
1da177e4 LT |
1862 | goto out_freectl; |
1863 | msg_sys.msg_control = ctl_buf; | |
1864 | } | |
1865 | msg_sys.msg_flags = flags; | |
1866 | ||
1867 | if (sock->file->f_flags & O_NONBLOCK) | |
1868 | msg_sys.msg_flags |= MSG_DONTWAIT; | |
1869 | err = sock_sendmsg(sock, &msg_sys, total_len); | |
1870 | ||
1871 | out_freectl: | |
89bddce5 | 1872 | if (ctl_buf != ctl) |
1da177e4 LT |
1873 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
1874 | out_freeiov: | |
1875 | if (iov != iovstack) | |
1876 | sock_kfree_s(sock->sk, iov, iov_size); | |
1877 | out_put: | |
6cb153ca | 1878 | fput_light(sock->file, fput_needed); |
89bddce5 | 1879 | out: |
1da177e4 LT |
1880 | return err; |
1881 | } | |
1882 | ||
1883 | /* | |
1884 | * BSD recvmsg interface | |
1885 | */ | |
1886 | ||
89bddce5 SH |
1887 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, |
1888 | unsigned int flags) | |
1da177e4 | 1889 | { |
89bddce5 SH |
1890 | struct compat_msghdr __user *msg_compat = |
1891 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1892 | struct socket *sock; |
1893 | struct iovec iovstack[UIO_FASTIOV]; | |
89bddce5 | 1894 | struct iovec *iov = iovstack; |
1da177e4 LT |
1895 | struct msghdr msg_sys; |
1896 | unsigned long cmsg_ptr; | |
1897 | int err, iov_size, total_len, len; | |
6cb153ca | 1898 | int fput_needed; |
1da177e4 LT |
1899 | |
1900 | /* kernel mode address */ | |
1901 | char addr[MAX_SOCK_ADDR]; | |
1902 | ||
1903 | /* user mode address pointers */ | |
1904 | struct sockaddr __user *uaddr; | |
1905 | int __user *uaddr_len; | |
89bddce5 | 1906 | |
1da177e4 LT |
1907 | if (MSG_CMSG_COMPAT & flags) { |
1908 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1909 | return -EFAULT; | |
89bddce5 SH |
1910 | } |
1911 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1912 | return -EFAULT; | |
1da177e4 | 1913 | |
6cb153ca | 1914 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1915 | if (!sock) |
1916 | goto out; | |
1917 | ||
1918 | err = -EMSGSIZE; | |
1919 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1920 | goto out_put; | |
89bddce5 SH |
1921 | |
1922 | /* Check whether to allocate the iovec area */ | |
1da177e4 LT |
1923 | err = -ENOMEM; |
1924 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1925 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1926 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1927 | if (!iov) | |
1928 | goto out_put; | |
1929 | } | |
1930 | ||
1931 | /* | |
89bddce5 SH |
1932 | * Save the user-mode address (verify_iovec will change the |
1933 | * kernel msghdr to use the kernel address space) | |
1da177e4 | 1934 | */ |
89bddce5 | 1935 | |
cfcabdcc | 1936 | uaddr = (__force void __user *)msg_sys.msg_name; |
1da177e4 LT |
1937 | uaddr_len = COMPAT_NAMELEN(msg); |
1938 | if (MSG_CMSG_COMPAT & flags) { | |
1939 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1940 | } else | |
1941 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1942 | if (err < 0) | |
1943 | goto out_freeiov; | |
89bddce5 | 1944 | total_len = err; |
1da177e4 LT |
1945 | |
1946 | cmsg_ptr = (unsigned long)msg_sys.msg_control; | |
4a19542e | 1947 | msg_sys.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); |
89bddce5 | 1948 | |
1da177e4 LT |
1949 | if (sock->file->f_flags & O_NONBLOCK) |
1950 | flags |= MSG_DONTWAIT; | |
1951 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); | |
1952 | if (err < 0) | |
1953 | goto out_freeiov; | |
1954 | len = err; | |
1955 | ||
1956 | if (uaddr != NULL) { | |
89bddce5 SH |
1957 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, |
1958 | uaddr_len); | |
1da177e4 LT |
1959 | if (err < 0) |
1960 | goto out_freeiov; | |
1961 | } | |
37f7f421 DM |
1962 | err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), |
1963 | COMPAT_FLAGS(msg)); | |
1da177e4 LT |
1964 | if (err) |
1965 | goto out_freeiov; | |
1966 | if (MSG_CMSG_COMPAT & flags) | |
89bddce5 | 1967 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1968 | &msg_compat->msg_controllen); |
1969 | else | |
89bddce5 | 1970 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1971 | &msg->msg_controllen); |
1972 | if (err) | |
1973 | goto out_freeiov; | |
1974 | err = len; | |
1975 | ||
1976 | out_freeiov: | |
1977 | if (iov != iovstack) | |
1978 | sock_kfree_s(sock->sk, iov, iov_size); | |
1979 | out_put: | |
6cb153ca | 1980 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1981 | out: |
1982 | return err; | |
1983 | } | |
1984 | ||
1985 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
1986 | ||
1987 | /* Argument list sizes for sys_socketcall */ | |
1988 | #define AL(x) ((x) * sizeof(unsigned long)) | |
89bddce5 SH |
1989 | static const unsigned char nargs[18]={ |
1990 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), | |
1991 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), | |
1992 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) | |
1993 | }; | |
1994 | ||
1da177e4 LT |
1995 | #undef AL |
1996 | ||
1997 | /* | |
89bddce5 | 1998 | * System call vectors. |
1da177e4 LT |
1999 | * |
2000 | * Argument checking cleaned up. Saved 20% in size. | |
2001 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 2002 | * it is set by the callees. |
1da177e4 LT |
2003 | */ |
2004 | ||
2005 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) | |
2006 | { | |
2007 | unsigned long a[6]; | |
89bddce5 | 2008 | unsigned long a0, a1; |
1da177e4 LT |
2009 | int err; |
2010 | ||
89bddce5 | 2011 | if (call < 1 || call > SYS_RECVMSG) |
1da177e4 LT |
2012 | return -EINVAL; |
2013 | ||
2014 | /* copy_from_user should be SMP safe. */ | |
2015 | if (copy_from_user(a, args, nargs[call])) | |
2016 | return -EFAULT; | |
3ec3b2fb | 2017 | |
89bddce5 | 2018 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
3ec3b2fb DW |
2019 | if (err) |
2020 | return err; | |
2021 | ||
89bddce5 SH |
2022 | a0 = a[0]; |
2023 | a1 = a[1]; | |
2024 | ||
2025 | switch (call) { | |
2026 | case SYS_SOCKET: | |
2027 | err = sys_socket(a0, a1, a[2]); | |
2028 | break; | |
2029 | case SYS_BIND: | |
2030 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2031 | break; | |
2032 | case SYS_CONNECT: | |
2033 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2034 | break; | |
2035 | case SYS_LISTEN: | |
2036 | err = sys_listen(a0, a1); | |
2037 | break; | |
2038 | case SYS_ACCEPT: | |
2039 | err = | |
2040 | sys_accept(a0, (struct sockaddr __user *)a1, | |
2041 | (int __user *)a[2]); | |
2042 | break; | |
2043 | case SYS_GETSOCKNAME: | |
2044 | err = | |
2045 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2046 | (int __user *)a[2]); | |
2047 | break; | |
2048 | case SYS_GETPEERNAME: | |
2049 | err = | |
2050 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2051 | (int __user *)a[2]); | |
2052 | break; | |
2053 | case SYS_SOCKETPAIR: | |
2054 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2055 | break; | |
2056 | case SYS_SEND: | |
2057 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2058 | break; | |
2059 | case SYS_SENDTO: | |
2060 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2061 | (struct sockaddr __user *)a[4], a[5]); | |
2062 | break; | |
2063 | case SYS_RECV: | |
2064 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2065 | break; | |
2066 | case SYS_RECVFROM: | |
2067 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2068 | (struct sockaddr __user *)a[4], | |
2069 | (int __user *)a[5]); | |
2070 | break; | |
2071 | case SYS_SHUTDOWN: | |
2072 | err = sys_shutdown(a0, a1); | |
2073 | break; | |
2074 | case SYS_SETSOCKOPT: | |
2075 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2076 | break; | |
2077 | case SYS_GETSOCKOPT: | |
2078 | err = | |
2079 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2080 | (int __user *)a[4]); | |
2081 | break; | |
2082 | case SYS_SENDMSG: | |
2083 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2084 | break; | |
2085 | case SYS_RECVMSG: | |
2086 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2087 | break; | |
2088 | default: | |
2089 | err = -EINVAL; | |
2090 | break; | |
1da177e4 LT |
2091 | } |
2092 | return err; | |
2093 | } | |
2094 | ||
89bddce5 | 2095 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2096 | |
55737fda SH |
2097 | /** |
2098 | * sock_register - add a socket protocol handler | |
2099 | * @ops: description of protocol | |
2100 | * | |
1da177e4 LT |
2101 | * This function is called by a protocol handler that wants to |
2102 | * advertise its address family, and have it linked into the | |
55737fda SH |
2103 | * socket interface. The value ops->family coresponds to the |
2104 | * socket system call protocol family. | |
1da177e4 | 2105 | */ |
f0fd27d4 | 2106 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2107 | { |
2108 | int err; | |
2109 | ||
2110 | if (ops->family >= NPROTO) { | |
89bddce5 SH |
2111 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
2112 | NPROTO); | |
1da177e4 LT |
2113 | return -ENOBUFS; |
2114 | } | |
55737fda SH |
2115 | |
2116 | spin_lock(&net_family_lock); | |
2117 | if (net_families[ops->family]) | |
2118 | err = -EEXIST; | |
2119 | else { | |
89bddce5 | 2120 | net_families[ops->family] = ops; |
1da177e4 LT |
2121 | err = 0; |
2122 | } | |
55737fda SH |
2123 | spin_unlock(&net_family_lock); |
2124 | ||
89bddce5 | 2125 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
2126 | return err; |
2127 | } | |
2128 | ||
55737fda SH |
2129 | /** |
2130 | * sock_unregister - remove a protocol handler | |
2131 | * @family: protocol family to remove | |
2132 | * | |
1da177e4 LT |
2133 | * This function is called by a protocol handler that wants to |
2134 | * remove its address family, and have it unlinked from the | |
55737fda SH |
2135 | * new socket creation. |
2136 | * | |
2137 | * If protocol handler is a module, then it can use module reference | |
2138 | * counts to protect against new references. If protocol handler is not | |
2139 | * a module then it needs to provide its own protection in | |
2140 | * the ops->create routine. | |
1da177e4 | 2141 | */ |
f0fd27d4 | 2142 | void sock_unregister(int family) |
1da177e4 | 2143 | { |
f0fd27d4 | 2144 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 2145 | |
55737fda | 2146 | spin_lock(&net_family_lock); |
89bddce5 | 2147 | net_families[family] = NULL; |
55737fda SH |
2148 | spin_unlock(&net_family_lock); |
2149 | ||
2150 | synchronize_rcu(); | |
2151 | ||
89bddce5 | 2152 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
1da177e4 LT |
2153 | } |
2154 | ||
77d76ea3 | 2155 | static int __init sock_init(void) |
1da177e4 LT |
2156 | { |
2157 | /* | |
89bddce5 | 2158 | * Initialize sock SLAB cache. |
1da177e4 | 2159 | */ |
89bddce5 | 2160 | |
1da177e4 LT |
2161 | sk_init(); |
2162 | ||
1da177e4 | 2163 | /* |
89bddce5 | 2164 | * Initialize skbuff SLAB cache |
1da177e4 LT |
2165 | */ |
2166 | skb_init(); | |
1da177e4 LT |
2167 | |
2168 | /* | |
89bddce5 | 2169 | * Initialize the protocols module. |
1da177e4 LT |
2170 | */ |
2171 | ||
2172 | init_inodecache(); | |
2173 | register_filesystem(&sock_fs_type); | |
2174 | sock_mnt = kern_mount(&sock_fs_type); | |
77d76ea3 AK |
2175 | |
2176 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
2177 | */ |
2178 | ||
2179 | #ifdef CONFIG_NETFILTER | |
2180 | netfilter_init(); | |
2181 | #endif | |
cbeb321a DM |
2182 | |
2183 | return 0; | |
1da177e4 LT |
2184 | } |
2185 | ||
77d76ea3 AK |
2186 | core_initcall(sock_init); /* early initcall */ |
2187 | ||
1da177e4 LT |
2188 | #ifdef CONFIG_PROC_FS |
2189 | void socket_seq_show(struct seq_file *seq) | |
2190 | { | |
2191 | int cpu; | |
2192 | int counter = 0; | |
2193 | ||
6f912042 | 2194 | for_each_possible_cpu(cpu) |
89bddce5 | 2195 | counter += per_cpu(sockets_in_use, cpu); |
1da177e4 LT |
2196 | |
2197 | /* It can be negative, by the way. 8) */ | |
2198 | if (counter < 0) | |
2199 | counter = 0; | |
2200 | ||
2201 | seq_printf(seq, "sockets: used %d\n", counter); | |
2202 | } | |
89bddce5 | 2203 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 2204 | |
89bbfc95 SP |
2205 | #ifdef CONFIG_COMPAT |
2206 | static long compat_sock_ioctl(struct file *file, unsigned cmd, | |
89bddce5 | 2207 | unsigned long arg) |
89bbfc95 SP |
2208 | { |
2209 | struct socket *sock = file->private_data; | |
2210 | int ret = -ENOIOCTLCMD; | |
2211 | ||
2212 | if (sock->ops->compat_ioctl) | |
2213 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
2214 | ||
2215 | return ret; | |
2216 | } | |
2217 | #endif | |
2218 | ||
ac5a488e SS |
2219 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
2220 | { | |
2221 | return sock->ops->bind(sock, addr, addrlen); | |
2222 | } | |
2223 | ||
2224 | int kernel_listen(struct socket *sock, int backlog) | |
2225 | { | |
2226 | return sock->ops->listen(sock, backlog); | |
2227 | } | |
2228 | ||
2229 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
2230 | { | |
2231 | struct sock *sk = sock->sk; | |
2232 | int err; | |
2233 | ||
2234 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
2235 | newsock); | |
2236 | if (err < 0) | |
2237 | goto done; | |
2238 | ||
2239 | err = sock->ops->accept(sock, *newsock, flags); | |
2240 | if (err < 0) { | |
2241 | sock_release(*newsock); | |
fa8705b0 | 2242 | *newsock = NULL; |
ac5a488e SS |
2243 | goto done; |
2244 | } | |
2245 | ||
2246 | (*newsock)->ops = sock->ops; | |
2247 | ||
2248 | done: | |
2249 | return err; | |
2250 | } | |
2251 | ||
2252 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
4768fbcb | 2253 | int flags) |
ac5a488e SS |
2254 | { |
2255 | return sock->ops->connect(sock, addr, addrlen, flags); | |
2256 | } | |
2257 | ||
2258 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
2259 | int *addrlen) | |
2260 | { | |
2261 | return sock->ops->getname(sock, addr, addrlen, 0); | |
2262 | } | |
2263 | ||
2264 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
2265 | int *addrlen) | |
2266 | { | |
2267 | return sock->ops->getname(sock, addr, addrlen, 1); | |
2268 | } | |
2269 | ||
2270 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
2271 | char *optval, int *optlen) | |
2272 | { | |
2273 | mm_segment_t oldfs = get_fs(); | |
2274 | int err; | |
2275 | ||
2276 | set_fs(KERNEL_DS); | |
2277 | if (level == SOL_SOCKET) | |
2278 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
2279 | else | |
2280 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
2281 | optlen); | |
2282 | set_fs(oldfs); | |
2283 | return err; | |
2284 | } | |
2285 | ||
2286 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
2287 | char *optval, int optlen) | |
2288 | { | |
2289 | mm_segment_t oldfs = get_fs(); | |
2290 | int err; | |
2291 | ||
2292 | set_fs(KERNEL_DS); | |
2293 | if (level == SOL_SOCKET) | |
2294 | err = sock_setsockopt(sock, level, optname, optval, optlen); | |
2295 | else | |
2296 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
2297 | optlen); | |
2298 | set_fs(oldfs); | |
2299 | return err; | |
2300 | } | |
2301 | ||
2302 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
2303 | size_t size, int flags) | |
2304 | { | |
2305 | if (sock->ops->sendpage) | |
2306 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
2307 | ||
2308 | return sock_no_sendpage(sock, page, offset, size, flags); | |
2309 | } | |
2310 | ||
2311 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
2312 | { | |
2313 | mm_segment_t oldfs = get_fs(); | |
2314 | int err; | |
2315 | ||
2316 | set_fs(KERNEL_DS); | |
2317 | err = sock->ops->ioctl(sock, cmd, arg); | |
2318 | set_fs(oldfs); | |
2319 | ||
2320 | return err; | |
2321 | } | |
2322 | ||
91cf45f0 TM |
2323 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
2324 | { | |
2325 | return sock->ops->shutdown(sock, how); | |
2326 | } | |
2327 | ||
1da177e4 LT |
2328 | /* ABI emulation layers need these two */ |
2329 | EXPORT_SYMBOL(move_addr_to_kernel); | |
2330 | EXPORT_SYMBOL(move_addr_to_user); | |
2331 | EXPORT_SYMBOL(sock_create); | |
2332 | EXPORT_SYMBOL(sock_create_kern); | |
2333 | EXPORT_SYMBOL(sock_create_lite); | |
2334 | EXPORT_SYMBOL(sock_map_fd); | |
2335 | EXPORT_SYMBOL(sock_recvmsg); | |
2336 | EXPORT_SYMBOL(sock_register); | |
2337 | EXPORT_SYMBOL(sock_release); | |
2338 | EXPORT_SYMBOL(sock_sendmsg); | |
2339 | EXPORT_SYMBOL(sock_unregister); | |
2340 | EXPORT_SYMBOL(sock_wake_async); | |
2341 | EXPORT_SYMBOL(sockfd_lookup); | |
2342 | EXPORT_SYMBOL(kernel_sendmsg); | |
2343 | EXPORT_SYMBOL(kernel_recvmsg); | |
ac5a488e SS |
2344 | EXPORT_SYMBOL(kernel_bind); |
2345 | EXPORT_SYMBOL(kernel_listen); | |
2346 | EXPORT_SYMBOL(kernel_accept); | |
2347 | EXPORT_SYMBOL(kernel_connect); | |
2348 | EXPORT_SYMBOL(kernel_getsockname); | |
2349 | EXPORT_SYMBOL(kernel_getpeername); | |
2350 | EXPORT_SYMBOL(kernel_getsockopt); | |
2351 | EXPORT_SYMBOL(kernel_setsockopt); | |
2352 | EXPORT_SYMBOL(kernel_sendpage); | |
2353 | EXPORT_SYMBOL(kernel_sock_ioctl); | |
91cf45f0 | 2354 | EXPORT_SYMBOL(kernel_sock_shutdown); |