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 | ||
997b37da RDC |
704 | if (unlikely(!sock->ops->splice_read)) |
705 | return -EINVAL; | |
706 | ||
9c55e01c JA |
707 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
708 | } | |
709 | ||
ce1d4d3e | 710 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
89bddce5 | 711 | struct sock_iocb *siocb) |
ce1d4d3e CH |
712 | { |
713 | if (!is_sync_kiocb(iocb)) { | |
714 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); | |
715 | if (!siocb) | |
716 | return NULL; | |
1da177e4 LT |
717 | iocb->ki_dtor = sock_aio_dtor; |
718 | } | |
1da177e4 | 719 | |
ce1d4d3e | 720 | siocb->kiocb = iocb; |
ce1d4d3e CH |
721 | iocb->private = siocb; |
722 | return siocb; | |
1da177e4 LT |
723 | } |
724 | ||
ce1d4d3e | 725 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
726 | struct file *file, const struct iovec *iov, |
727 | unsigned long nr_segs) | |
ce1d4d3e CH |
728 | { |
729 | struct socket *sock = file->private_data; | |
730 | size_t size = 0; | |
731 | int i; | |
1da177e4 | 732 | |
89bddce5 SH |
733 | for (i = 0; i < nr_segs; i++) |
734 | size += iov[i].iov_len; | |
1da177e4 | 735 | |
ce1d4d3e CH |
736 | msg->msg_name = NULL; |
737 | msg->msg_namelen = 0; | |
738 | msg->msg_control = NULL; | |
739 | msg->msg_controllen = 0; | |
89bddce5 | 740 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
741 | msg->msg_iovlen = nr_segs; |
742 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
743 | ||
744 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); | |
745 | } | |
746 | ||
027445c3 BP |
747 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
748 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
749 | { |
750 | struct sock_iocb siocb, *x; | |
751 | ||
1da177e4 LT |
752 | if (pos != 0) |
753 | return -ESPIPE; | |
027445c3 BP |
754 | |
755 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
1da177e4 LT |
756 | return 0; |
757 | ||
027445c3 BP |
758 | |
759 | x = alloc_sock_iocb(iocb, &siocb); | |
ce1d4d3e CH |
760 | if (!x) |
761 | return -ENOMEM; | |
027445c3 | 762 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
763 | } |
764 | ||
ce1d4d3e | 765 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
766 | struct file *file, const struct iovec *iov, |
767 | unsigned long nr_segs) | |
1da177e4 | 768 | { |
ce1d4d3e CH |
769 | struct socket *sock = file->private_data; |
770 | size_t size = 0; | |
771 | int i; | |
1da177e4 | 772 | |
89bddce5 SH |
773 | for (i = 0; i < nr_segs; i++) |
774 | size += iov[i].iov_len; | |
1da177e4 | 775 | |
ce1d4d3e CH |
776 | msg->msg_name = NULL; |
777 | msg->msg_namelen = 0; | |
778 | msg->msg_control = NULL; | |
779 | msg->msg_controllen = 0; | |
89bddce5 | 780 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
781 | msg->msg_iovlen = nr_segs; |
782 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
783 | if (sock->type == SOCK_SEQPACKET) | |
784 | msg->msg_flags |= MSG_EOR; | |
1da177e4 | 785 | |
ce1d4d3e | 786 | return __sock_sendmsg(iocb, sock, msg, size); |
1da177e4 LT |
787 | } |
788 | ||
027445c3 BP |
789 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
790 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
791 | { |
792 | struct sock_iocb siocb, *x; | |
1da177e4 | 793 | |
ce1d4d3e CH |
794 | if (pos != 0) |
795 | return -ESPIPE; | |
027445c3 | 796 | |
027445c3 | 797 | x = alloc_sock_iocb(iocb, &siocb); |
ce1d4d3e CH |
798 | if (!x) |
799 | return -ENOMEM; | |
1da177e4 | 800 | |
027445c3 | 801 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
802 | } |
803 | ||
1da177e4 LT |
804 | /* |
805 | * Atomic setting of ioctl hooks to avoid race | |
806 | * with module unload. | |
807 | */ | |
808 | ||
4a3e2f71 | 809 | static DEFINE_MUTEX(br_ioctl_mutex); |
881d966b | 810 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL; |
1da177e4 | 811 | |
881d966b | 812 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
1da177e4 | 813 | { |
4a3e2f71 | 814 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 815 | br_ioctl_hook = hook; |
4a3e2f71 | 816 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 | 817 | } |
89bddce5 | 818 | |
1da177e4 LT |
819 | EXPORT_SYMBOL(brioctl_set); |
820 | ||
4a3e2f71 | 821 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 822 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 823 | |
881d966b | 824 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 825 | { |
4a3e2f71 | 826 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 827 | vlan_ioctl_hook = hook; |
4a3e2f71 | 828 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 829 | } |
89bddce5 | 830 | |
1da177e4 LT |
831 | EXPORT_SYMBOL(vlan_ioctl_set); |
832 | ||
4a3e2f71 | 833 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
89bddce5 | 834 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1da177e4 | 835 | |
89bddce5 | 836 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 837 | { |
4a3e2f71 | 838 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 839 | dlci_ioctl_hook = hook; |
4a3e2f71 | 840 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 | 841 | } |
89bddce5 | 842 | |
1da177e4 LT |
843 | EXPORT_SYMBOL(dlci_ioctl_set); |
844 | ||
845 | /* | |
846 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
847 | * what to do with it - that's up to the protocol still. | |
848 | */ | |
849 | ||
850 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
851 | { | |
852 | struct socket *sock; | |
881d966b | 853 | struct sock *sk; |
1da177e4 LT |
854 | void __user *argp = (void __user *)arg; |
855 | int pid, err; | |
881d966b | 856 | struct net *net; |
1da177e4 | 857 | |
b69aee04 | 858 | sock = file->private_data; |
881d966b EB |
859 | sk = sock->sk; |
860 | net = sk->sk_net; | |
1da177e4 | 861 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
881d966b | 862 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 863 | } else |
d86b5e0e | 864 | #ifdef CONFIG_WIRELESS_EXT |
1da177e4 | 865 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
881d966b | 866 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 867 | } else |
89bddce5 SH |
868 | #endif /* CONFIG_WIRELESS_EXT */ |
869 | switch (cmd) { | |
1da177e4 LT |
870 | case FIOSETOWN: |
871 | case SIOCSPGRP: | |
872 | err = -EFAULT; | |
873 | if (get_user(pid, (int __user *)argp)) | |
874 | break; | |
875 | err = f_setown(sock->file, pid, 1); | |
876 | break; | |
877 | case FIOGETOWN: | |
878 | case SIOCGPGRP: | |
609d7fa9 | 879 | err = put_user(f_getown(sock->file), |
89bddce5 | 880 | (int __user *)argp); |
1da177e4 LT |
881 | break; |
882 | case SIOCGIFBR: | |
883 | case SIOCSIFBR: | |
884 | case SIOCBRADDBR: | |
885 | case SIOCBRDELBR: | |
886 | err = -ENOPKG; | |
887 | if (!br_ioctl_hook) | |
888 | request_module("bridge"); | |
889 | ||
4a3e2f71 | 890 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 891 | if (br_ioctl_hook) |
881d966b | 892 | err = br_ioctl_hook(net, cmd, argp); |
4a3e2f71 | 893 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
894 | break; |
895 | case SIOCGIFVLAN: | |
896 | case SIOCSIFVLAN: | |
897 | err = -ENOPKG; | |
898 | if (!vlan_ioctl_hook) | |
899 | request_module("8021q"); | |
900 | ||
4a3e2f71 | 901 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 902 | if (vlan_ioctl_hook) |
881d966b | 903 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 904 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 905 | break; |
1da177e4 LT |
906 | case SIOCADDDLCI: |
907 | case SIOCDELDLCI: | |
908 | err = -ENOPKG; | |
909 | if (!dlci_ioctl_hook) | |
910 | request_module("dlci"); | |
911 | ||
7512cbf6 PE |
912 | mutex_lock(&dlci_ioctl_mutex); |
913 | if (dlci_ioctl_hook) | |
1da177e4 | 914 | err = dlci_ioctl_hook(cmd, argp); |
7512cbf6 | 915 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 LT |
916 | break; |
917 | default: | |
918 | err = sock->ops->ioctl(sock, cmd, arg); | |
b5e5fa5e CH |
919 | |
920 | /* | |
921 | * If this ioctl is unknown try to hand it down | |
922 | * to the NIC driver. | |
923 | */ | |
924 | if (err == -ENOIOCTLCMD) | |
881d966b | 925 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 926 | break; |
89bddce5 | 927 | } |
1da177e4 LT |
928 | return err; |
929 | } | |
930 | ||
931 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
932 | { | |
933 | int err; | |
934 | struct socket *sock = NULL; | |
89bddce5 | 935 | |
1da177e4 LT |
936 | err = security_socket_create(family, type, protocol, 1); |
937 | if (err) | |
938 | goto out; | |
939 | ||
940 | sock = sock_alloc(); | |
941 | if (!sock) { | |
942 | err = -ENOMEM; | |
943 | goto out; | |
944 | } | |
945 | ||
1da177e4 | 946 | sock->type = type; |
7420ed23 VY |
947 | err = security_socket_post_create(sock, family, type, protocol, 1); |
948 | if (err) | |
949 | goto out_release; | |
950 | ||
1da177e4 LT |
951 | out: |
952 | *res = sock; | |
953 | return err; | |
7420ed23 VY |
954 | out_release: |
955 | sock_release(sock); | |
956 | sock = NULL; | |
957 | goto out; | |
1da177e4 LT |
958 | } |
959 | ||
960 | /* No kernel lock held - perfect */ | |
89bddce5 | 961 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
962 | { |
963 | struct socket *sock; | |
964 | ||
965 | /* | |
89bddce5 | 966 | * We can't return errors to poll, so it's either yes or no. |
1da177e4 | 967 | */ |
b69aee04 | 968 | sock = file->private_data; |
1da177e4 LT |
969 | return sock->ops->poll(file, sock, wait); |
970 | } | |
971 | ||
89bddce5 | 972 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 973 | { |
b69aee04 | 974 | struct socket *sock = file->private_data; |
1da177e4 LT |
975 | |
976 | return sock->ops->mmap(file, sock, vma); | |
977 | } | |
978 | ||
20380731 | 979 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
980 | { |
981 | /* | |
89bddce5 SH |
982 | * It was possible the inode is NULL we were |
983 | * closing an unfinished socket. | |
1da177e4 LT |
984 | */ |
985 | ||
89bddce5 | 986 | if (!inode) { |
1da177e4 LT |
987 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
988 | return 0; | |
989 | } | |
990 | sock_fasync(-1, filp, 0); | |
991 | sock_release(SOCKET_I(inode)); | |
992 | return 0; | |
993 | } | |
994 | ||
995 | /* | |
996 | * Update the socket async list | |
997 | * | |
998 | * Fasync_list locking strategy. | |
999 | * | |
1000 | * 1. fasync_list is modified only under process context socket lock | |
1001 | * i.e. under semaphore. | |
1002 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
1003 | * or under socket lock. | |
1004 | * 3. fasync_list can be used from softirq context, so that | |
1005 | * modification under socket lock have to be enhanced with | |
1006 | * write_lock_bh(&sk->sk_callback_lock). | |
1007 | * --ANK (990710) | |
1008 | */ | |
1009 | ||
1010 | static int sock_fasync(int fd, struct file *filp, int on) | |
1011 | { | |
89bddce5 | 1012 | struct fasync_struct *fa, *fna = NULL, **prev; |
1da177e4 LT |
1013 | struct socket *sock; |
1014 | struct sock *sk; | |
1015 | ||
89bddce5 | 1016 | if (on) { |
8b3a7005 | 1017 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
89bddce5 | 1018 | if (fna == NULL) |
1da177e4 LT |
1019 | return -ENOMEM; |
1020 | } | |
1021 | ||
b69aee04 | 1022 | sock = filp->private_data; |
1da177e4 | 1023 | |
89bddce5 SH |
1024 | sk = sock->sk; |
1025 | if (sk == NULL) { | |
1da177e4 LT |
1026 | kfree(fna); |
1027 | return -EINVAL; | |
1028 | } | |
1029 | ||
1030 | lock_sock(sk); | |
1031 | ||
89bddce5 | 1032 | prev = &(sock->fasync_list); |
1da177e4 | 1033 | |
89bddce5 SH |
1034 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) |
1035 | if (fa->fa_file == filp) | |
1da177e4 LT |
1036 | break; |
1037 | ||
89bddce5 SH |
1038 | if (on) { |
1039 | if (fa != NULL) { | |
1da177e4 | 1040 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1041 | fa->fa_fd = fd; |
1da177e4 LT |
1042 | write_unlock_bh(&sk->sk_callback_lock); |
1043 | ||
1044 | kfree(fna); | |
1045 | goto out; | |
1046 | } | |
89bddce5 SH |
1047 | fna->fa_file = filp; |
1048 | fna->fa_fd = fd; | |
1049 | fna->magic = FASYNC_MAGIC; | |
1050 | fna->fa_next = sock->fasync_list; | |
1da177e4 | 1051 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1052 | sock->fasync_list = fna; |
1da177e4 | 1053 | write_unlock_bh(&sk->sk_callback_lock); |
89bddce5 SH |
1054 | } else { |
1055 | if (fa != NULL) { | |
1da177e4 | 1056 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1057 | *prev = fa->fa_next; |
1da177e4 LT |
1058 | write_unlock_bh(&sk->sk_callback_lock); |
1059 | kfree(fa); | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | out: | |
1064 | release_sock(sock->sk); | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | /* This function may be called only under socket lock or callback_lock */ | |
1069 | ||
1070 | int sock_wake_async(struct socket *sock, int how, int band) | |
1071 | { | |
1072 | if (!sock || !sock->fasync_list) | |
1073 | return -1; | |
89bddce5 | 1074 | switch (how) { |
8d8ad9d7 | 1075 | case SOCK_WAKE_WAITD: |
1da177e4 LT |
1076 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1077 | break; | |
1078 | goto call_kill; | |
8d8ad9d7 | 1079 | case SOCK_WAKE_SPACE: |
1da177e4 LT |
1080 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
1081 | break; | |
1082 | /* fall through */ | |
8d8ad9d7 | 1083 | case SOCK_WAKE_IO: |
89bddce5 | 1084 | call_kill: |
1da177e4 LT |
1085 | __kill_fasync(sock->fasync_list, SIGIO, band); |
1086 | break; | |
8d8ad9d7 | 1087 | case SOCK_WAKE_URG: |
1da177e4 LT |
1088 | __kill_fasync(sock->fasync_list, SIGURG, band); |
1089 | } | |
1090 | return 0; | |
1091 | } | |
1092 | ||
1b8d7ae4 | 1093 | static int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1094 | struct socket **res, int kern) |
1da177e4 LT |
1095 | { |
1096 | int err; | |
1097 | struct socket *sock; | |
55737fda | 1098 | const struct net_proto_family *pf; |
1da177e4 LT |
1099 | |
1100 | /* | |
89bddce5 | 1101 | * Check protocol is in range |
1da177e4 LT |
1102 | */ |
1103 | if (family < 0 || family >= NPROTO) | |
1104 | return -EAFNOSUPPORT; | |
1105 | if (type < 0 || type >= SOCK_MAX) | |
1106 | return -EINVAL; | |
1107 | ||
1108 | /* Compatibility. | |
1109 | ||
1110 | This uglymoron is moved from INET layer to here to avoid | |
1111 | deadlock in module load. | |
1112 | */ | |
1113 | if (family == PF_INET && type == SOCK_PACKET) { | |
89bddce5 | 1114 | static int warned; |
1da177e4 LT |
1115 | if (!warned) { |
1116 | warned = 1; | |
89bddce5 SH |
1117 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1118 | current->comm); | |
1da177e4 LT |
1119 | } |
1120 | family = PF_PACKET; | |
1121 | } | |
1122 | ||
1123 | err = security_socket_create(family, type, protocol, kern); | |
1124 | if (err) | |
1125 | return err; | |
89bddce5 | 1126 | |
55737fda SH |
1127 | /* |
1128 | * Allocate the socket and allow the family to set things up. if | |
1129 | * the protocol is 0, the family is instructed to select an appropriate | |
1130 | * default. | |
1131 | */ | |
1132 | sock = sock_alloc(); | |
1133 | if (!sock) { | |
1134 | if (net_ratelimit()) | |
1135 | printk(KERN_WARNING "socket: no more sockets\n"); | |
1136 | return -ENFILE; /* Not exactly a match, but its the | |
1137 | closest posix thing */ | |
1138 | } | |
1139 | ||
1140 | sock->type = type; | |
1141 | ||
1da177e4 | 1142 | #if defined(CONFIG_KMOD) |
89bddce5 SH |
1143 | /* Attempt to load a protocol module if the find failed. |
1144 | * | |
1145 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1146 | * requested real, full-featured networking support upon configuration. |
1147 | * Otherwise module support will break! | |
1148 | */ | |
55737fda | 1149 | if (net_families[family] == NULL) |
89bddce5 | 1150 | request_module("net-pf-%d", family); |
1da177e4 LT |
1151 | #endif |
1152 | ||
55737fda SH |
1153 | rcu_read_lock(); |
1154 | pf = rcu_dereference(net_families[family]); | |
1155 | err = -EAFNOSUPPORT; | |
1156 | if (!pf) | |
1157 | goto out_release; | |
1da177e4 LT |
1158 | |
1159 | /* | |
1160 | * We will call the ->create function, that possibly is in a loadable | |
1161 | * module, so we have to bump that loadable module refcnt first. | |
1162 | */ | |
55737fda | 1163 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1164 | goto out_release; |
1165 | ||
55737fda SH |
1166 | /* Now protected by module ref count */ |
1167 | rcu_read_unlock(); | |
1168 | ||
1b8d7ae4 | 1169 | err = pf->create(net, sock, protocol); |
55737fda | 1170 | if (err < 0) |
1da177e4 | 1171 | goto out_module_put; |
a79af59e | 1172 | |
1da177e4 LT |
1173 | /* |
1174 | * Now to bump the refcnt of the [loadable] module that owns this | |
1175 | * socket at sock_release time we decrement its refcnt. | |
1176 | */ | |
55737fda SH |
1177 | if (!try_module_get(sock->ops->owner)) |
1178 | goto out_module_busy; | |
1179 | ||
1da177e4 LT |
1180 | /* |
1181 | * Now that we're done with the ->create function, the [loadable] | |
1182 | * module can have its refcnt decremented | |
1183 | */ | |
55737fda | 1184 | module_put(pf->owner); |
7420ed23 VY |
1185 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1186 | if (err) | |
3b185525 | 1187 | goto out_sock_release; |
55737fda | 1188 | *res = sock; |
1da177e4 | 1189 | |
55737fda SH |
1190 | return 0; |
1191 | ||
1192 | out_module_busy: | |
1193 | err = -EAFNOSUPPORT; | |
1da177e4 | 1194 | out_module_put: |
55737fda SH |
1195 | sock->ops = NULL; |
1196 | module_put(pf->owner); | |
1197 | out_sock_release: | |
1da177e4 | 1198 | sock_release(sock); |
55737fda SH |
1199 | return err; |
1200 | ||
1201 | out_release: | |
1202 | rcu_read_unlock(); | |
1203 | goto out_sock_release; | |
1da177e4 LT |
1204 | } |
1205 | ||
1206 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1207 | { | |
1b8d7ae4 | 1208 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 LT |
1209 | } |
1210 | ||
1211 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1212 | { | |
1b8d7ae4 | 1213 | return __sock_create(&init_net, family, type, protocol, res, 1); |
1da177e4 LT |
1214 | } |
1215 | ||
1216 | asmlinkage long sys_socket(int family, int type, int protocol) | |
1217 | { | |
1218 | int retval; | |
1219 | struct socket *sock; | |
1220 | ||
1221 | retval = sock_create(family, type, protocol, &sock); | |
1222 | if (retval < 0) | |
1223 | goto out; | |
1224 | ||
1225 | retval = sock_map_fd(sock); | |
1226 | if (retval < 0) | |
1227 | goto out_release; | |
1228 | ||
1229 | out: | |
1230 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1231 | return retval; | |
1232 | ||
1233 | out_release: | |
1234 | sock_release(sock); | |
1235 | return retval; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Create a pair of connected sockets. | |
1240 | */ | |
1241 | ||
89bddce5 SH |
1242 | asmlinkage long sys_socketpair(int family, int type, int protocol, |
1243 | int __user *usockvec) | |
1da177e4 LT |
1244 | { |
1245 | struct socket *sock1, *sock2; | |
1246 | int fd1, fd2, err; | |
db349509 | 1247 | struct file *newfile1, *newfile2; |
1da177e4 LT |
1248 | |
1249 | /* | |
1250 | * Obtain the first socket and check if the underlying protocol | |
1251 | * supports the socketpair call. | |
1252 | */ | |
1253 | ||
1254 | err = sock_create(family, type, protocol, &sock1); | |
1255 | if (err < 0) | |
1256 | goto out; | |
1257 | ||
1258 | err = sock_create(family, type, protocol, &sock2); | |
1259 | if (err < 0) | |
1260 | goto out_release_1; | |
1261 | ||
1262 | err = sock1->ops->socketpair(sock1, sock2); | |
89bddce5 | 1263 | if (err < 0) |
1da177e4 LT |
1264 | goto out_release_both; |
1265 | ||
db349509 | 1266 | fd1 = sock_alloc_fd(&newfile1); |
bf3c23d1 DM |
1267 | if (unlikely(fd1 < 0)) { |
1268 | err = fd1; | |
db349509 | 1269 | goto out_release_both; |
bf3c23d1 | 1270 | } |
1da177e4 | 1271 | |
db349509 AV |
1272 | fd2 = sock_alloc_fd(&newfile2); |
1273 | if (unlikely(fd2 < 0)) { | |
bf3c23d1 | 1274 | err = fd2; |
db349509 AV |
1275 | put_filp(newfile1); |
1276 | put_unused_fd(fd1); | |
1da177e4 | 1277 | goto out_release_both; |
db349509 | 1278 | } |
1da177e4 | 1279 | |
db349509 AV |
1280 | err = sock_attach_fd(sock1, newfile1); |
1281 | if (unlikely(err < 0)) { | |
1282 | goto out_fd2; | |
1283 | } | |
1284 | ||
1285 | err = sock_attach_fd(sock2, newfile2); | |
1286 | if (unlikely(err < 0)) { | |
1287 | fput(newfile1); | |
1288 | goto out_fd1; | |
1289 | } | |
1290 | ||
1291 | err = audit_fd_pair(fd1, fd2); | |
1292 | if (err < 0) { | |
1293 | fput(newfile1); | |
1294 | fput(newfile2); | |
1295 | goto out_fd; | |
1296 | } | |
1da177e4 | 1297 | |
db349509 AV |
1298 | fd_install(fd1, newfile1); |
1299 | fd_install(fd2, newfile2); | |
1da177e4 LT |
1300 | /* fd1 and fd2 may be already another descriptors. |
1301 | * Not kernel problem. | |
1302 | */ | |
1303 | ||
89bddce5 | 1304 | err = put_user(fd1, &usockvec[0]); |
1da177e4 LT |
1305 | if (!err) |
1306 | err = put_user(fd2, &usockvec[1]); | |
1307 | if (!err) | |
1308 | return 0; | |
1309 | ||
1310 | sys_close(fd2); | |
1311 | sys_close(fd1); | |
1312 | return err; | |
1313 | ||
1da177e4 | 1314 | out_release_both: |
89bddce5 | 1315 | sock_release(sock2); |
1da177e4 | 1316 | out_release_1: |
89bddce5 | 1317 | sock_release(sock1); |
1da177e4 LT |
1318 | out: |
1319 | return err; | |
db349509 AV |
1320 | |
1321 | out_fd2: | |
1322 | put_filp(newfile1); | |
1323 | sock_release(sock1); | |
1324 | out_fd1: | |
1325 | put_filp(newfile2); | |
1326 | sock_release(sock2); | |
1327 | out_fd: | |
1328 | put_unused_fd(fd1); | |
1329 | put_unused_fd(fd2); | |
1330 | goto out; | |
1da177e4 LT |
1331 | } |
1332 | ||
1da177e4 LT |
1333 | /* |
1334 | * Bind a name to a socket. Nothing much to do here since it's | |
1335 | * the protocol's responsibility to handle the local address. | |
1336 | * | |
1337 | * We move the socket address to kernel space before we call | |
1338 | * the protocol layer (having also checked the address is ok). | |
1339 | */ | |
1340 | ||
1341 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) | |
1342 | { | |
1343 | struct socket *sock; | |
1344 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1345 | int err, fput_needed; |
1da177e4 | 1346 | |
89bddce5 | 1347 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1348 | if (sock) { |
89bddce5 SH |
1349 | err = move_addr_to_kernel(umyaddr, addrlen, address); |
1350 | if (err >= 0) { | |
1351 | err = security_socket_bind(sock, | |
1352 | (struct sockaddr *)address, | |
1353 | addrlen); | |
6cb153ca BL |
1354 | if (!err) |
1355 | err = sock->ops->bind(sock, | |
89bddce5 SH |
1356 | (struct sockaddr *) |
1357 | address, addrlen); | |
1da177e4 | 1358 | } |
6cb153ca | 1359 | fput_light(sock->file, fput_needed); |
89bddce5 | 1360 | } |
1da177e4 LT |
1361 | return err; |
1362 | } | |
1363 | ||
1da177e4 LT |
1364 | /* |
1365 | * Perform a listen. Basically, we allow the protocol to do anything | |
1366 | * necessary for a listen, and if that works, we mark the socket as | |
1367 | * ready for listening. | |
1368 | */ | |
1369 | ||
1da177e4 LT |
1370 | asmlinkage long sys_listen(int fd, int backlog) |
1371 | { | |
1372 | struct socket *sock; | |
6cb153ca | 1373 | int err, fput_needed; |
b8e1f9b5 | 1374 | int somaxconn; |
89bddce5 SH |
1375 | |
1376 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1377 | if (sock) { | |
b8e1f9b5 PE |
1378 | somaxconn = sock->sk->sk_net->sysctl_somaxconn; |
1379 | if ((unsigned)backlog > somaxconn) | |
1380 | backlog = somaxconn; | |
1da177e4 LT |
1381 | |
1382 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1383 | if (!err) |
1384 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1385 | |
6cb153ca | 1386 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1387 | } |
1388 | return err; | |
1389 | } | |
1390 | ||
1da177e4 LT |
1391 | /* |
1392 | * For accept, we attempt to create a new socket, set up the link | |
1393 | * with the client, wake up the client, then return the new | |
1394 | * connected fd. We collect the address of the connector in kernel | |
1395 | * space and move it to user at the very end. This is unclean because | |
1396 | * we open the socket then return an error. | |
1397 | * | |
1398 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1399 | * status to recvmsg. We need to add that support in a way thats | |
1400 | * clean when we restucture accept also. | |
1401 | */ | |
1402 | ||
89bddce5 SH |
1403 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, |
1404 | int __user *upeer_addrlen) | |
1da177e4 LT |
1405 | { |
1406 | struct socket *sock, *newsock; | |
39d8c1b6 | 1407 | struct file *newfile; |
6cb153ca | 1408 | int err, len, newfd, fput_needed; |
1da177e4 LT |
1409 | char address[MAX_SOCK_ADDR]; |
1410 | ||
6cb153ca | 1411 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1412 | if (!sock) |
1413 | goto out; | |
1414 | ||
1415 | err = -ENFILE; | |
89bddce5 | 1416 | if (!(newsock = sock_alloc())) |
1da177e4 LT |
1417 | goto out_put; |
1418 | ||
1419 | newsock->type = sock->type; | |
1420 | newsock->ops = sock->ops; | |
1421 | ||
1da177e4 LT |
1422 | /* |
1423 | * We don't need try_module_get here, as the listening socket (sock) | |
1424 | * has the protocol module (sock->ops->owner) held. | |
1425 | */ | |
1426 | __module_get(newsock->ops->owner); | |
1427 | ||
39d8c1b6 DM |
1428 | newfd = sock_alloc_fd(&newfile); |
1429 | if (unlikely(newfd < 0)) { | |
1430 | err = newfd; | |
9a1875e6 DM |
1431 | sock_release(newsock); |
1432 | goto out_put; | |
39d8c1b6 DM |
1433 | } |
1434 | ||
1435 | err = sock_attach_fd(newsock, newfile); | |
1436 | if (err < 0) | |
79f4f642 | 1437 | goto out_fd_simple; |
39d8c1b6 | 1438 | |
a79af59e FF |
1439 | err = security_socket_accept(sock, newsock); |
1440 | if (err) | |
39d8c1b6 | 1441 | goto out_fd; |
a79af59e | 1442 | |
1da177e4 LT |
1443 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1444 | if (err < 0) | |
39d8c1b6 | 1445 | goto out_fd; |
1da177e4 LT |
1446 | |
1447 | if (upeer_sockaddr) { | |
89bddce5 SH |
1448 | if (newsock->ops->getname(newsock, (struct sockaddr *)address, |
1449 | &len, 2) < 0) { | |
1da177e4 | 1450 | err = -ECONNABORTED; |
39d8c1b6 | 1451 | goto out_fd; |
1da177e4 | 1452 | } |
89bddce5 SH |
1453 | err = move_addr_to_user(address, len, upeer_sockaddr, |
1454 | upeer_addrlen); | |
1da177e4 | 1455 | if (err < 0) |
39d8c1b6 | 1456 | goto out_fd; |
1da177e4 LT |
1457 | } |
1458 | ||
1459 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1460 | ||
39d8c1b6 DM |
1461 | fd_install(newfd, newfile); |
1462 | err = newfd; | |
1da177e4 LT |
1463 | |
1464 | security_socket_post_accept(sock, newsock); | |
1465 | ||
1466 | out_put: | |
6cb153ca | 1467 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1468 | out: |
1469 | return err; | |
79f4f642 AD |
1470 | out_fd_simple: |
1471 | sock_release(newsock); | |
1472 | put_filp(newfile); | |
1473 | put_unused_fd(newfd); | |
1474 | goto out_put; | |
39d8c1b6 | 1475 | out_fd: |
9606a216 | 1476 | fput(newfile); |
39d8c1b6 | 1477 | put_unused_fd(newfd); |
1da177e4 LT |
1478 | goto out_put; |
1479 | } | |
1480 | ||
1da177e4 LT |
1481 | /* |
1482 | * Attempt to connect to a socket with the server address. The address | |
1483 | * is in user space so we verify it is OK and move it to kernel space. | |
1484 | * | |
1485 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1486 | * break bindings | |
1487 | * | |
1488 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1489 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1490 | * include the -EINPROGRESS status for such sockets. | |
1491 | */ | |
1492 | ||
89bddce5 SH |
1493 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, |
1494 | int addrlen) | |
1da177e4 LT |
1495 | { |
1496 | struct socket *sock; | |
1497 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1498 | int err, fput_needed; |
1da177e4 | 1499 | |
6cb153ca | 1500 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1501 | if (!sock) |
1502 | goto out; | |
1503 | err = move_addr_to_kernel(uservaddr, addrlen, address); | |
1504 | if (err < 0) | |
1505 | goto out_put; | |
1506 | ||
89bddce5 SH |
1507 | err = |
1508 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); | |
1da177e4 LT |
1509 | if (err) |
1510 | goto out_put; | |
1511 | ||
89bddce5 | 1512 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
1da177e4 LT |
1513 | sock->file->f_flags); |
1514 | out_put: | |
6cb153ca | 1515 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1516 | out: |
1517 | return err; | |
1518 | } | |
1519 | ||
1520 | /* | |
1521 | * Get the local address ('name') of a socket object. Move the obtained | |
1522 | * name to user space. | |
1523 | */ | |
1524 | ||
89bddce5 SH |
1525 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1526 | int __user *usockaddr_len) | |
1da177e4 LT |
1527 | { |
1528 | struct socket *sock; | |
1529 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1530 | int len, err, fput_needed; |
89bddce5 | 1531 | |
6cb153ca | 1532 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1533 | if (!sock) |
1534 | goto out; | |
1535 | ||
1536 | err = security_socket_getsockname(sock); | |
1537 | if (err) | |
1538 | goto out_put; | |
1539 | ||
1540 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); | |
1541 | if (err) | |
1542 | goto out_put; | |
1543 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); | |
1544 | ||
1545 | out_put: | |
6cb153ca | 1546 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1547 | out: |
1548 | return err; | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * Get the remote address ('name') of a socket object. Move the obtained | |
1553 | * name to user space. | |
1554 | */ | |
1555 | ||
89bddce5 SH |
1556 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1557 | int __user *usockaddr_len) | |
1da177e4 LT |
1558 | { |
1559 | struct socket *sock; | |
1560 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1561 | int len, err, fput_needed; |
1da177e4 | 1562 | |
89bddce5 SH |
1563 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1564 | if (sock != NULL) { | |
1da177e4 LT |
1565 | err = security_socket_getpeername(sock); |
1566 | if (err) { | |
6cb153ca | 1567 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1568 | return err; |
1569 | } | |
1570 | ||
89bddce5 SH |
1571 | err = |
1572 | sock->ops->getname(sock, (struct sockaddr *)address, &len, | |
1573 | 1); | |
1da177e4 | 1574 | if (!err) |
89bddce5 SH |
1575 | err = move_addr_to_user(address, len, usockaddr, |
1576 | usockaddr_len); | |
6cb153ca | 1577 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1578 | } |
1579 | return err; | |
1580 | } | |
1581 | ||
1582 | /* | |
1583 | * Send a datagram to a given address. We move the address into kernel | |
1584 | * space and check the user space data area is readable before invoking | |
1585 | * the protocol. | |
1586 | */ | |
1587 | ||
89bddce5 SH |
1588 | asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, |
1589 | unsigned flags, struct sockaddr __user *addr, | |
1590 | int addr_len) | |
1da177e4 LT |
1591 | { |
1592 | struct socket *sock; | |
1593 | char address[MAX_SOCK_ADDR]; | |
1594 | int err; | |
1595 | struct msghdr msg; | |
1596 | struct iovec iov; | |
6cb153ca | 1597 | int fput_needed; |
6cb153ca | 1598 | |
de0fa95c PE |
1599 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1600 | if (!sock) | |
4387ff75 | 1601 | goto out; |
6cb153ca | 1602 | |
89bddce5 SH |
1603 | iov.iov_base = buff; |
1604 | iov.iov_len = len; | |
1605 | msg.msg_name = NULL; | |
1606 | msg.msg_iov = &iov; | |
1607 | msg.msg_iovlen = 1; | |
1608 | msg.msg_control = NULL; | |
1609 | msg.msg_controllen = 0; | |
1610 | msg.msg_namelen = 0; | |
6cb153ca | 1611 | if (addr) { |
1da177e4 LT |
1612 | err = move_addr_to_kernel(addr, addr_len, address); |
1613 | if (err < 0) | |
1614 | goto out_put; | |
89bddce5 SH |
1615 | msg.msg_name = address; |
1616 | msg.msg_namelen = addr_len; | |
1da177e4 LT |
1617 | } |
1618 | if (sock->file->f_flags & O_NONBLOCK) | |
1619 | flags |= MSG_DONTWAIT; | |
1620 | msg.msg_flags = flags; | |
1621 | err = sock_sendmsg(sock, &msg, len); | |
1622 | ||
89bddce5 | 1623 | out_put: |
de0fa95c | 1624 | fput_light(sock->file, fput_needed); |
4387ff75 | 1625 | out: |
1da177e4 LT |
1626 | return err; |
1627 | } | |
1628 | ||
1629 | /* | |
89bddce5 | 1630 | * Send a datagram down a socket. |
1da177e4 LT |
1631 | */ |
1632 | ||
89bddce5 | 1633 | asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) |
1da177e4 LT |
1634 | { |
1635 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1636 | } | |
1637 | ||
1638 | /* | |
89bddce5 | 1639 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
1640 | * sender. We verify the buffers are writable and if needed move the |
1641 | * sender address from kernel to user space. | |
1642 | */ | |
1643 | ||
89bddce5 SH |
1644 | asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, |
1645 | unsigned flags, struct sockaddr __user *addr, | |
1646 | int __user *addr_len) | |
1da177e4 LT |
1647 | { |
1648 | struct socket *sock; | |
1649 | struct iovec iov; | |
1650 | struct msghdr msg; | |
1651 | char address[MAX_SOCK_ADDR]; | |
89bddce5 | 1652 | int err, err2; |
6cb153ca BL |
1653 | int fput_needed; |
1654 | ||
de0fa95c | 1655 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 1656 | if (!sock) |
de0fa95c | 1657 | goto out; |
1da177e4 | 1658 | |
89bddce5 SH |
1659 | msg.msg_control = NULL; |
1660 | msg.msg_controllen = 0; | |
1661 | msg.msg_iovlen = 1; | |
1662 | msg.msg_iov = &iov; | |
1663 | iov.iov_len = size; | |
1664 | iov.iov_base = ubuf; | |
1665 | msg.msg_name = address; | |
1666 | msg.msg_namelen = MAX_SOCK_ADDR; | |
1da177e4 LT |
1667 | if (sock->file->f_flags & O_NONBLOCK) |
1668 | flags |= MSG_DONTWAIT; | |
89bddce5 | 1669 | err = sock_recvmsg(sock, &msg, size, flags); |
1da177e4 | 1670 | |
89bddce5 SH |
1671 | if (err >= 0 && addr != NULL) { |
1672 | err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); | |
1673 | if (err2 < 0) | |
1674 | err = err2; | |
1da177e4 | 1675 | } |
de0fa95c PE |
1676 | |
1677 | fput_light(sock->file, fput_needed); | |
4387ff75 | 1678 | out: |
1da177e4 LT |
1679 | return err; |
1680 | } | |
1681 | ||
1682 | /* | |
89bddce5 | 1683 | * Receive a datagram from a socket. |
1da177e4 LT |
1684 | */ |
1685 | ||
89bddce5 SH |
1686 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
1687 | unsigned flags) | |
1da177e4 LT |
1688 | { |
1689 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1690 | } | |
1691 | ||
1692 | /* | |
1693 | * Set a socket option. Because we don't know the option lengths we have | |
1694 | * to pass the user mode parameter for the protocols to sort out. | |
1695 | */ | |
1696 | ||
89bddce5 SH |
1697 | asmlinkage long sys_setsockopt(int fd, int level, int optname, |
1698 | char __user *optval, int optlen) | |
1da177e4 | 1699 | { |
6cb153ca | 1700 | int err, fput_needed; |
1da177e4 LT |
1701 | struct socket *sock; |
1702 | ||
1703 | if (optlen < 0) | |
1704 | return -EINVAL; | |
89bddce5 SH |
1705 | |
1706 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1707 | if (sock != NULL) { | |
1708 | err = security_socket_setsockopt(sock, level, optname); | |
6cb153ca BL |
1709 | if (err) |
1710 | goto out_put; | |
1da177e4 LT |
1711 | |
1712 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1713 | err = |
1714 | sock_setsockopt(sock, level, optname, optval, | |
1715 | optlen); | |
1da177e4 | 1716 | else |
89bddce5 SH |
1717 | err = |
1718 | sock->ops->setsockopt(sock, level, optname, optval, | |
1719 | optlen); | |
6cb153ca BL |
1720 | out_put: |
1721 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1722 | } |
1723 | return err; | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * Get a socket option. Because we don't know the option lengths we have | |
1728 | * to pass a user mode parameter for the protocols to sort out. | |
1729 | */ | |
1730 | ||
89bddce5 SH |
1731 | asmlinkage long sys_getsockopt(int fd, int level, int optname, |
1732 | char __user *optval, int __user *optlen) | |
1da177e4 | 1733 | { |
6cb153ca | 1734 | int err, fput_needed; |
1da177e4 LT |
1735 | struct socket *sock; |
1736 | ||
89bddce5 SH |
1737 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1738 | if (sock != NULL) { | |
6cb153ca BL |
1739 | err = security_socket_getsockopt(sock, level, optname); |
1740 | if (err) | |
1741 | goto out_put; | |
1da177e4 LT |
1742 | |
1743 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1744 | err = |
1745 | sock_getsockopt(sock, level, optname, optval, | |
1746 | optlen); | |
1da177e4 | 1747 | else |
89bddce5 SH |
1748 | err = |
1749 | sock->ops->getsockopt(sock, level, optname, optval, | |
1750 | optlen); | |
6cb153ca BL |
1751 | out_put: |
1752 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1753 | } |
1754 | return err; | |
1755 | } | |
1756 | ||
1da177e4 LT |
1757 | /* |
1758 | * Shutdown a socket. | |
1759 | */ | |
1760 | ||
1761 | asmlinkage long sys_shutdown(int fd, int how) | |
1762 | { | |
6cb153ca | 1763 | int err, fput_needed; |
1da177e4 LT |
1764 | struct socket *sock; |
1765 | ||
89bddce5 SH |
1766 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1767 | if (sock != NULL) { | |
1da177e4 | 1768 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
1769 | if (!err) |
1770 | err = sock->ops->shutdown(sock, how); | |
1771 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1772 | } |
1773 | return err; | |
1774 | } | |
1775 | ||
89bddce5 | 1776 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
1777 | * fields which are the same type (int / unsigned) on our platforms. |
1778 | */ | |
1779 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1780 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1781 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1782 | ||
1da177e4 LT |
1783 | /* |
1784 | * BSD sendmsg interface | |
1785 | */ | |
1786 | ||
1787 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
1788 | { | |
89bddce5 SH |
1789 | struct compat_msghdr __user *msg_compat = |
1790 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1791 | struct socket *sock; |
1792 | char address[MAX_SOCK_ADDR]; | |
1793 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
b9d717a7 | 1794 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
89bddce5 SH |
1795 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
1796 | /* 20 is size of ipv6_pktinfo */ | |
1da177e4 LT |
1797 | unsigned char *ctl_buf = ctl; |
1798 | struct msghdr msg_sys; | |
1799 | int err, ctl_len, iov_size, total_len; | |
6cb153ca | 1800 | int fput_needed; |
89bddce5 | 1801 | |
1da177e4 LT |
1802 | err = -EFAULT; |
1803 | if (MSG_CMSG_COMPAT & flags) { | |
1804 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1805 | return -EFAULT; | |
89bddce5 SH |
1806 | } |
1807 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1da177e4 LT |
1808 | return -EFAULT; |
1809 | ||
6cb153ca | 1810 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
89bddce5 | 1811 | if (!sock) |
1da177e4 LT |
1812 | goto out; |
1813 | ||
1814 | /* do not move before msg_sys is valid */ | |
1815 | err = -EMSGSIZE; | |
1816 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1817 | goto out_put; | |
1818 | ||
89bddce5 | 1819 | /* Check whether to allocate the iovec area */ |
1da177e4 LT |
1820 | err = -ENOMEM; |
1821 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1822 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1823 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1824 | if (!iov) | |
1825 | goto out_put; | |
1826 | } | |
1827 | ||
1828 | /* This will also move the address data into kernel space */ | |
1829 | if (MSG_CMSG_COMPAT & flags) { | |
1830 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); | |
1831 | } else | |
1832 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); | |
89bddce5 | 1833 | if (err < 0) |
1da177e4 LT |
1834 | goto out_freeiov; |
1835 | total_len = err; | |
1836 | ||
1837 | err = -ENOBUFS; | |
1838 | ||
1839 | if (msg_sys.msg_controllen > INT_MAX) | |
1840 | goto out_freeiov; | |
89bddce5 | 1841 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1842 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 SH |
1843 | err = |
1844 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, | |
1845 | sizeof(ctl)); | |
1da177e4 LT |
1846 | if (err) |
1847 | goto out_freeiov; | |
1848 | ctl_buf = msg_sys.msg_control; | |
8920e8f9 | 1849 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1850 | } else if (ctl_len) { |
89bddce5 | 1851 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 1852 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 1853 | if (ctl_buf == NULL) |
1da177e4 LT |
1854 | goto out_freeiov; |
1855 | } | |
1856 | err = -EFAULT; | |
1857 | /* | |
1858 | * Careful! Before this, msg_sys.msg_control contains a user pointer. | |
1859 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1860 | * checking falls down on this. | |
1861 | */ | |
89bddce5 SH |
1862 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, |
1863 | ctl_len)) | |
1da177e4 LT |
1864 | goto out_freectl; |
1865 | msg_sys.msg_control = ctl_buf; | |
1866 | } | |
1867 | msg_sys.msg_flags = flags; | |
1868 | ||
1869 | if (sock->file->f_flags & O_NONBLOCK) | |
1870 | msg_sys.msg_flags |= MSG_DONTWAIT; | |
1871 | err = sock_sendmsg(sock, &msg_sys, total_len); | |
1872 | ||
1873 | out_freectl: | |
89bddce5 | 1874 | if (ctl_buf != ctl) |
1da177e4 LT |
1875 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
1876 | out_freeiov: | |
1877 | if (iov != iovstack) | |
1878 | sock_kfree_s(sock->sk, iov, iov_size); | |
1879 | out_put: | |
6cb153ca | 1880 | fput_light(sock->file, fput_needed); |
89bddce5 | 1881 | out: |
1da177e4 LT |
1882 | return err; |
1883 | } | |
1884 | ||
1885 | /* | |
1886 | * BSD recvmsg interface | |
1887 | */ | |
1888 | ||
89bddce5 SH |
1889 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, |
1890 | unsigned int flags) | |
1da177e4 | 1891 | { |
89bddce5 SH |
1892 | struct compat_msghdr __user *msg_compat = |
1893 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1894 | struct socket *sock; |
1895 | struct iovec iovstack[UIO_FASTIOV]; | |
89bddce5 | 1896 | struct iovec *iov = iovstack; |
1da177e4 LT |
1897 | struct msghdr msg_sys; |
1898 | unsigned long cmsg_ptr; | |
1899 | int err, iov_size, total_len, len; | |
6cb153ca | 1900 | int fput_needed; |
1da177e4 LT |
1901 | |
1902 | /* kernel mode address */ | |
1903 | char addr[MAX_SOCK_ADDR]; | |
1904 | ||
1905 | /* user mode address pointers */ | |
1906 | struct sockaddr __user *uaddr; | |
1907 | int __user *uaddr_len; | |
89bddce5 | 1908 | |
1da177e4 LT |
1909 | if (MSG_CMSG_COMPAT & flags) { |
1910 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1911 | return -EFAULT; | |
89bddce5 SH |
1912 | } |
1913 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1914 | return -EFAULT; | |
1da177e4 | 1915 | |
6cb153ca | 1916 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1917 | if (!sock) |
1918 | goto out; | |
1919 | ||
1920 | err = -EMSGSIZE; | |
1921 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1922 | goto out_put; | |
89bddce5 SH |
1923 | |
1924 | /* Check whether to allocate the iovec area */ | |
1da177e4 LT |
1925 | err = -ENOMEM; |
1926 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1927 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1928 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1929 | if (!iov) | |
1930 | goto out_put; | |
1931 | } | |
1932 | ||
1933 | /* | |
89bddce5 SH |
1934 | * Save the user-mode address (verify_iovec will change the |
1935 | * kernel msghdr to use the kernel address space) | |
1da177e4 | 1936 | */ |
89bddce5 | 1937 | |
cfcabdcc | 1938 | uaddr = (__force void __user *)msg_sys.msg_name; |
1da177e4 LT |
1939 | uaddr_len = COMPAT_NAMELEN(msg); |
1940 | if (MSG_CMSG_COMPAT & flags) { | |
1941 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1942 | } else | |
1943 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1944 | if (err < 0) | |
1945 | goto out_freeiov; | |
89bddce5 | 1946 | total_len = err; |
1da177e4 LT |
1947 | |
1948 | cmsg_ptr = (unsigned long)msg_sys.msg_control; | |
4a19542e | 1949 | msg_sys.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); |
89bddce5 | 1950 | |
1da177e4 LT |
1951 | if (sock->file->f_flags & O_NONBLOCK) |
1952 | flags |= MSG_DONTWAIT; | |
1953 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); | |
1954 | if (err < 0) | |
1955 | goto out_freeiov; | |
1956 | len = err; | |
1957 | ||
1958 | if (uaddr != NULL) { | |
89bddce5 SH |
1959 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, |
1960 | uaddr_len); | |
1da177e4 LT |
1961 | if (err < 0) |
1962 | goto out_freeiov; | |
1963 | } | |
37f7f421 DM |
1964 | err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), |
1965 | COMPAT_FLAGS(msg)); | |
1da177e4 LT |
1966 | if (err) |
1967 | goto out_freeiov; | |
1968 | if (MSG_CMSG_COMPAT & flags) | |
89bddce5 | 1969 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1970 | &msg_compat->msg_controllen); |
1971 | else | |
89bddce5 | 1972 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1973 | &msg->msg_controllen); |
1974 | if (err) | |
1975 | goto out_freeiov; | |
1976 | err = len; | |
1977 | ||
1978 | out_freeiov: | |
1979 | if (iov != iovstack) | |
1980 | sock_kfree_s(sock->sk, iov, iov_size); | |
1981 | out_put: | |
6cb153ca | 1982 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1983 | out: |
1984 | return err; | |
1985 | } | |
1986 | ||
1987 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
1988 | ||
1989 | /* Argument list sizes for sys_socketcall */ | |
1990 | #define AL(x) ((x) * sizeof(unsigned long)) | |
89bddce5 SH |
1991 | static const unsigned char nargs[18]={ |
1992 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), | |
1993 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), | |
1994 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) | |
1995 | }; | |
1996 | ||
1da177e4 LT |
1997 | #undef AL |
1998 | ||
1999 | /* | |
89bddce5 | 2000 | * System call vectors. |
1da177e4 LT |
2001 | * |
2002 | * Argument checking cleaned up. Saved 20% in size. | |
2003 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 2004 | * it is set by the callees. |
1da177e4 LT |
2005 | */ |
2006 | ||
2007 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) | |
2008 | { | |
2009 | unsigned long a[6]; | |
89bddce5 | 2010 | unsigned long a0, a1; |
1da177e4 LT |
2011 | int err; |
2012 | ||
89bddce5 | 2013 | if (call < 1 || call > SYS_RECVMSG) |
1da177e4 LT |
2014 | return -EINVAL; |
2015 | ||
2016 | /* copy_from_user should be SMP safe. */ | |
2017 | if (copy_from_user(a, args, nargs[call])) | |
2018 | return -EFAULT; | |
3ec3b2fb | 2019 | |
89bddce5 | 2020 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
3ec3b2fb DW |
2021 | if (err) |
2022 | return err; | |
2023 | ||
89bddce5 SH |
2024 | a0 = a[0]; |
2025 | a1 = a[1]; | |
2026 | ||
2027 | switch (call) { | |
2028 | case SYS_SOCKET: | |
2029 | err = sys_socket(a0, a1, a[2]); | |
2030 | break; | |
2031 | case SYS_BIND: | |
2032 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2033 | break; | |
2034 | case SYS_CONNECT: | |
2035 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2036 | break; | |
2037 | case SYS_LISTEN: | |
2038 | err = sys_listen(a0, a1); | |
2039 | break; | |
2040 | case SYS_ACCEPT: | |
2041 | err = | |
2042 | sys_accept(a0, (struct sockaddr __user *)a1, | |
2043 | (int __user *)a[2]); | |
2044 | break; | |
2045 | case SYS_GETSOCKNAME: | |
2046 | err = | |
2047 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2048 | (int __user *)a[2]); | |
2049 | break; | |
2050 | case SYS_GETPEERNAME: | |
2051 | err = | |
2052 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2053 | (int __user *)a[2]); | |
2054 | break; | |
2055 | case SYS_SOCKETPAIR: | |
2056 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2057 | break; | |
2058 | case SYS_SEND: | |
2059 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2060 | break; | |
2061 | case SYS_SENDTO: | |
2062 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2063 | (struct sockaddr __user *)a[4], a[5]); | |
2064 | break; | |
2065 | case SYS_RECV: | |
2066 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2067 | break; | |
2068 | case SYS_RECVFROM: | |
2069 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2070 | (struct sockaddr __user *)a[4], | |
2071 | (int __user *)a[5]); | |
2072 | break; | |
2073 | case SYS_SHUTDOWN: | |
2074 | err = sys_shutdown(a0, a1); | |
2075 | break; | |
2076 | case SYS_SETSOCKOPT: | |
2077 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2078 | break; | |
2079 | case SYS_GETSOCKOPT: | |
2080 | err = | |
2081 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2082 | (int __user *)a[4]); | |
2083 | break; | |
2084 | case SYS_SENDMSG: | |
2085 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2086 | break; | |
2087 | case SYS_RECVMSG: | |
2088 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2089 | break; | |
2090 | default: | |
2091 | err = -EINVAL; | |
2092 | break; | |
1da177e4 LT |
2093 | } |
2094 | return err; | |
2095 | } | |
2096 | ||
89bddce5 | 2097 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2098 | |
55737fda SH |
2099 | /** |
2100 | * sock_register - add a socket protocol handler | |
2101 | * @ops: description of protocol | |
2102 | * | |
1da177e4 LT |
2103 | * This function is called by a protocol handler that wants to |
2104 | * advertise its address family, and have it linked into the | |
55737fda SH |
2105 | * socket interface. The value ops->family coresponds to the |
2106 | * socket system call protocol family. | |
1da177e4 | 2107 | */ |
f0fd27d4 | 2108 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2109 | { |
2110 | int err; | |
2111 | ||
2112 | if (ops->family >= NPROTO) { | |
89bddce5 SH |
2113 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
2114 | NPROTO); | |
1da177e4 LT |
2115 | return -ENOBUFS; |
2116 | } | |
55737fda SH |
2117 | |
2118 | spin_lock(&net_family_lock); | |
2119 | if (net_families[ops->family]) | |
2120 | err = -EEXIST; | |
2121 | else { | |
89bddce5 | 2122 | net_families[ops->family] = ops; |
1da177e4 LT |
2123 | err = 0; |
2124 | } | |
55737fda SH |
2125 | spin_unlock(&net_family_lock); |
2126 | ||
89bddce5 | 2127 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
2128 | return err; |
2129 | } | |
2130 | ||
55737fda SH |
2131 | /** |
2132 | * sock_unregister - remove a protocol handler | |
2133 | * @family: protocol family to remove | |
2134 | * | |
1da177e4 LT |
2135 | * This function is called by a protocol handler that wants to |
2136 | * remove its address family, and have it unlinked from the | |
55737fda SH |
2137 | * new socket creation. |
2138 | * | |
2139 | * If protocol handler is a module, then it can use module reference | |
2140 | * counts to protect against new references. If protocol handler is not | |
2141 | * a module then it needs to provide its own protection in | |
2142 | * the ops->create routine. | |
1da177e4 | 2143 | */ |
f0fd27d4 | 2144 | void sock_unregister(int family) |
1da177e4 | 2145 | { |
f0fd27d4 | 2146 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 2147 | |
55737fda | 2148 | spin_lock(&net_family_lock); |
89bddce5 | 2149 | net_families[family] = NULL; |
55737fda SH |
2150 | spin_unlock(&net_family_lock); |
2151 | ||
2152 | synchronize_rcu(); | |
2153 | ||
89bddce5 | 2154 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
1da177e4 LT |
2155 | } |
2156 | ||
77d76ea3 | 2157 | static int __init sock_init(void) |
1da177e4 LT |
2158 | { |
2159 | /* | |
89bddce5 | 2160 | * Initialize sock SLAB cache. |
1da177e4 | 2161 | */ |
89bddce5 | 2162 | |
1da177e4 LT |
2163 | sk_init(); |
2164 | ||
1da177e4 | 2165 | /* |
89bddce5 | 2166 | * Initialize skbuff SLAB cache |
1da177e4 LT |
2167 | */ |
2168 | skb_init(); | |
1da177e4 LT |
2169 | |
2170 | /* | |
89bddce5 | 2171 | * Initialize the protocols module. |
1da177e4 LT |
2172 | */ |
2173 | ||
2174 | init_inodecache(); | |
2175 | register_filesystem(&sock_fs_type); | |
2176 | sock_mnt = kern_mount(&sock_fs_type); | |
77d76ea3 AK |
2177 | |
2178 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
2179 | */ |
2180 | ||
2181 | #ifdef CONFIG_NETFILTER | |
2182 | netfilter_init(); | |
2183 | #endif | |
cbeb321a DM |
2184 | |
2185 | return 0; | |
1da177e4 LT |
2186 | } |
2187 | ||
77d76ea3 AK |
2188 | core_initcall(sock_init); /* early initcall */ |
2189 | ||
1da177e4 LT |
2190 | #ifdef CONFIG_PROC_FS |
2191 | void socket_seq_show(struct seq_file *seq) | |
2192 | { | |
2193 | int cpu; | |
2194 | int counter = 0; | |
2195 | ||
6f912042 | 2196 | for_each_possible_cpu(cpu) |
89bddce5 | 2197 | counter += per_cpu(sockets_in_use, cpu); |
1da177e4 LT |
2198 | |
2199 | /* It can be negative, by the way. 8) */ | |
2200 | if (counter < 0) | |
2201 | counter = 0; | |
2202 | ||
2203 | seq_printf(seq, "sockets: used %d\n", counter); | |
2204 | } | |
89bddce5 | 2205 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 2206 | |
89bbfc95 SP |
2207 | #ifdef CONFIG_COMPAT |
2208 | static long compat_sock_ioctl(struct file *file, unsigned cmd, | |
89bddce5 | 2209 | unsigned long arg) |
89bbfc95 SP |
2210 | { |
2211 | struct socket *sock = file->private_data; | |
2212 | int ret = -ENOIOCTLCMD; | |
2213 | ||
2214 | if (sock->ops->compat_ioctl) | |
2215 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
2216 | ||
2217 | return ret; | |
2218 | } | |
2219 | #endif | |
2220 | ||
ac5a488e SS |
2221 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
2222 | { | |
2223 | return sock->ops->bind(sock, addr, addrlen); | |
2224 | } | |
2225 | ||
2226 | int kernel_listen(struct socket *sock, int backlog) | |
2227 | { | |
2228 | return sock->ops->listen(sock, backlog); | |
2229 | } | |
2230 | ||
2231 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
2232 | { | |
2233 | struct sock *sk = sock->sk; | |
2234 | int err; | |
2235 | ||
2236 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
2237 | newsock); | |
2238 | if (err < 0) | |
2239 | goto done; | |
2240 | ||
2241 | err = sock->ops->accept(sock, *newsock, flags); | |
2242 | if (err < 0) { | |
2243 | sock_release(*newsock); | |
fa8705b0 | 2244 | *newsock = NULL; |
ac5a488e SS |
2245 | goto done; |
2246 | } | |
2247 | ||
2248 | (*newsock)->ops = sock->ops; | |
2249 | ||
2250 | done: | |
2251 | return err; | |
2252 | } | |
2253 | ||
2254 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
4768fbcb | 2255 | int flags) |
ac5a488e SS |
2256 | { |
2257 | return sock->ops->connect(sock, addr, addrlen, flags); | |
2258 | } | |
2259 | ||
2260 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
2261 | int *addrlen) | |
2262 | { | |
2263 | return sock->ops->getname(sock, addr, addrlen, 0); | |
2264 | } | |
2265 | ||
2266 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
2267 | int *addrlen) | |
2268 | { | |
2269 | return sock->ops->getname(sock, addr, addrlen, 1); | |
2270 | } | |
2271 | ||
2272 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
2273 | char *optval, int *optlen) | |
2274 | { | |
2275 | mm_segment_t oldfs = get_fs(); | |
2276 | int err; | |
2277 | ||
2278 | set_fs(KERNEL_DS); | |
2279 | if (level == SOL_SOCKET) | |
2280 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
2281 | else | |
2282 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
2283 | optlen); | |
2284 | set_fs(oldfs); | |
2285 | return err; | |
2286 | } | |
2287 | ||
2288 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
2289 | char *optval, int optlen) | |
2290 | { | |
2291 | mm_segment_t oldfs = get_fs(); | |
2292 | int err; | |
2293 | ||
2294 | set_fs(KERNEL_DS); | |
2295 | if (level == SOL_SOCKET) | |
2296 | err = sock_setsockopt(sock, level, optname, optval, optlen); | |
2297 | else | |
2298 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
2299 | optlen); | |
2300 | set_fs(oldfs); | |
2301 | return err; | |
2302 | } | |
2303 | ||
2304 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
2305 | size_t size, int flags) | |
2306 | { | |
2307 | if (sock->ops->sendpage) | |
2308 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
2309 | ||
2310 | return sock_no_sendpage(sock, page, offset, size, flags); | |
2311 | } | |
2312 | ||
2313 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
2314 | { | |
2315 | mm_segment_t oldfs = get_fs(); | |
2316 | int err; | |
2317 | ||
2318 | set_fs(KERNEL_DS); | |
2319 | err = sock->ops->ioctl(sock, cmd, arg); | |
2320 | set_fs(oldfs); | |
2321 | ||
2322 | return err; | |
2323 | } | |
2324 | ||
91cf45f0 TM |
2325 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
2326 | { | |
2327 | return sock->ops->shutdown(sock, how); | |
2328 | } | |
2329 | ||
1da177e4 LT |
2330 | /* ABI emulation layers need these two */ |
2331 | EXPORT_SYMBOL(move_addr_to_kernel); | |
2332 | EXPORT_SYMBOL(move_addr_to_user); | |
2333 | EXPORT_SYMBOL(sock_create); | |
2334 | EXPORT_SYMBOL(sock_create_kern); | |
2335 | EXPORT_SYMBOL(sock_create_lite); | |
2336 | EXPORT_SYMBOL(sock_map_fd); | |
2337 | EXPORT_SYMBOL(sock_recvmsg); | |
2338 | EXPORT_SYMBOL(sock_register); | |
2339 | EXPORT_SYMBOL(sock_release); | |
2340 | EXPORT_SYMBOL(sock_sendmsg); | |
2341 | EXPORT_SYMBOL(sock_unregister); | |
2342 | EXPORT_SYMBOL(sock_wake_async); | |
2343 | EXPORT_SYMBOL(sockfd_lookup); | |
2344 | EXPORT_SYMBOL(kernel_sendmsg); | |
2345 | EXPORT_SYMBOL(kernel_recvmsg); | |
ac5a488e SS |
2346 | EXPORT_SYMBOL(kernel_bind); |
2347 | EXPORT_SYMBOL(kernel_listen); | |
2348 | EXPORT_SYMBOL(kernel_accept); | |
2349 | EXPORT_SYMBOL(kernel_connect); | |
2350 | EXPORT_SYMBOL(kernel_getsockname); | |
2351 | EXPORT_SYMBOL(kernel_getpeername); | |
2352 | EXPORT_SYMBOL(kernel_getsockopt); | |
2353 | EXPORT_SYMBOL(kernel_setsockopt); | |
2354 | EXPORT_SYMBOL(kernel_sendpage); | |
2355 | EXPORT_SYMBOL(kernel_sock_ioctl); | |
91cf45f0 | 2356 | EXPORT_SYMBOL(kernel_sock_shutdown); |