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> |
1da177e4 LT |
87 | |
88 | #include <asm/uaccess.h> | |
89 | #include <asm/unistd.h> | |
90 | ||
91 | #include <net/compat.h> | |
92 | ||
93 | #include <net/sock.h> | |
94 | #include <linux/netfilter.h> | |
95 | ||
96 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); | |
027445c3 BP |
97 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
98 | unsigned long nr_segs, loff_t pos); | |
99 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
100 | unsigned long nr_segs, loff_t pos); | |
89bddce5 | 101 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
1da177e4 LT |
102 | |
103 | static int sock_close(struct inode *inode, struct file *file); | |
104 | static unsigned int sock_poll(struct file *file, | |
105 | struct poll_table_struct *wait); | |
89bddce5 | 106 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
89bbfc95 SP |
107 | #ifdef CONFIG_COMPAT |
108 | static long compat_sock_ioctl(struct file *file, | |
89bddce5 | 109 | unsigned int cmd, unsigned long arg); |
89bbfc95 | 110 | #endif |
1da177e4 | 111 | static int sock_fasync(int fd, struct file *filp, int on); |
1da177e4 LT |
112 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
113 | int offset, size_t size, loff_t *ppos, int more); | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
117 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
118 | */ | |
119 | ||
da7071d7 | 120 | static const struct file_operations socket_file_ops = { |
1da177e4 LT |
121 | .owner = THIS_MODULE, |
122 | .llseek = no_llseek, | |
123 | .aio_read = sock_aio_read, | |
124 | .aio_write = sock_aio_write, | |
125 | .poll = sock_poll, | |
126 | .unlocked_ioctl = sock_ioctl, | |
89bbfc95 SP |
127 | #ifdef CONFIG_COMPAT |
128 | .compat_ioctl = compat_sock_ioctl, | |
129 | #endif | |
1da177e4 LT |
130 | .mmap = sock_mmap, |
131 | .open = sock_no_open, /* special open code to disallow open via /proc */ | |
132 | .release = sock_close, | |
133 | .fasync = sock_fasync, | |
5274f052 JA |
134 | .sendpage = sock_sendpage, |
135 | .splice_write = generic_splice_sendpage, | |
1da177e4 LT |
136 | }; |
137 | ||
138 | /* | |
139 | * The protocol list. Each protocol is registered in here. | |
140 | */ | |
141 | ||
1da177e4 | 142 | static DEFINE_SPINLOCK(net_family_lock); |
f0fd27d4 | 143 | static const struct net_proto_family *net_families[NPROTO] __read_mostly; |
1da177e4 | 144 | |
1da177e4 LT |
145 | /* |
146 | * Statistics counters of the socket lists | |
147 | */ | |
148 | ||
149 | static DEFINE_PER_CPU(int, sockets_in_use) = 0; | |
150 | ||
151 | /* | |
89bddce5 SH |
152 | * Support routines. |
153 | * Move socket addresses back and forth across the kernel/user | |
154 | * divide and look after the messy bits. | |
1da177e4 LT |
155 | */ |
156 | ||
89bddce5 | 157 | #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - |
1da177e4 LT |
158 | 16 for IP, 16 for IPX, |
159 | 24 for IPv6, | |
89bddce5 | 160 | about 80 for AX.25 |
1da177e4 LT |
161 | must be at least one bigger than |
162 | the AF_UNIX size (see net/unix/af_unix.c | |
89bddce5 | 163 | :unix_mkname()). |
1da177e4 | 164 | */ |
89bddce5 | 165 | |
1da177e4 LT |
166 | /** |
167 | * move_addr_to_kernel - copy a socket address into kernel space | |
168 | * @uaddr: Address in user space | |
169 | * @kaddr: Address in kernel space | |
170 | * @ulen: Length in user space | |
171 | * | |
172 | * The address is copied into kernel space. If the provided address is | |
173 | * too long an error code of -EINVAL is returned. If the copy gives | |
174 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
175 | */ | |
176 | ||
177 | int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) | |
178 | { | |
89bddce5 | 179 | if (ulen < 0 || ulen > MAX_SOCK_ADDR) |
1da177e4 | 180 | return -EINVAL; |
89bddce5 | 181 | if (ulen == 0) |
1da177e4 | 182 | return 0; |
89bddce5 | 183 | if (copy_from_user(kaddr, uaddr, ulen)) |
1da177e4 | 184 | return -EFAULT; |
3ec3b2fb | 185 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
186 | } |
187 | ||
188 | /** | |
189 | * move_addr_to_user - copy an address to user space | |
190 | * @kaddr: kernel space address | |
191 | * @klen: length of address in kernel | |
192 | * @uaddr: user space address | |
193 | * @ulen: pointer to user length field | |
194 | * | |
195 | * The value pointed to by ulen on entry is the buffer length available. | |
196 | * This is overwritten with the buffer space used. -EINVAL is returned | |
197 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
198 | * is returned if either the buffer or the length field are not | |
199 | * accessible. | |
200 | * After copying the data up to the limit the user specifies, the true | |
201 | * length of the data is written over the length limit the user | |
202 | * specified. Zero is returned for a success. | |
203 | */ | |
89bddce5 SH |
204 | |
205 | int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, | |
206 | int __user *ulen) | |
1da177e4 LT |
207 | { |
208 | int err; | |
209 | int len; | |
210 | ||
89bddce5 SH |
211 | err = get_user(len, ulen); |
212 | if (err) | |
1da177e4 | 213 | return err; |
89bddce5 SH |
214 | if (len > klen) |
215 | len = klen; | |
216 | if (len < 0 || len > MAX_SOCK_ADDR) | |
1da177e4 | 217 | return -EINVAL; |
89bddce5 | 218 | if (len) { |
d6fe3945 SG |
219 | if (audit_sockaddr(klen, kaddr)) |
220 | return -ENOMEM; | |
89bddce5 | 221 | if (copy_to_user(uaddr, kaddr, len)) |
1da177e4 LT |
222 | return -EFAULT; |
223 | } | |
224 | /* | |
89bddce5 SH |
225 | * "fromlen shall refer to the value before truncation.." |
226 | * 1003.1g | |
1da177e4 LT |
227 | */ |
228 | return __put_user(klen, ulen); | |
229 | } | |
230 | ||
231 | #define SOCKFS_MAGIC 0x534F434B | |
232 | ||
e18b890b | 233 | static struct kmem_cache *sock_inode_cachep __read_mostly; |
1da177e4 LT |
234 | |
235 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
236 | { | |
237 | struct socket_alloc *ei; | |
89bddce5 | 238 | |
e94b1766 | 239 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
240 | if (!ei) |
241 | return NULL; | |
242 | init_waitqueue_head(&ei->socket.wait); | |
89bddce5 | 243 | |
1da177e4 LT |
244 | ei->socket.fasync_list = NULL; |
245 | ei->socket.state = SS_UNCONNECTED; | |
246 | ei->socket.flags = 0; | |
247 | ei->socket.ops = NULL; | |
248 | ei->socket.sk = NULL; | |
249 | ei->socket.file = NULL; | |
1da177e4 LT |
250 | |
251 | return &ei->vfs_inode; | |
252 | } | |
253 | ||
254 | static void sock_destroy_inode(struct inode *inode) | |
255 | { | |
256 | kmem_cache_free(sock_inode_cachep, | |
257 | container_of(inode, struct socket_alloc, vfs_inode)); | |
258 | } | |
259 | ||
e18b890b | 260 | static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags) |
1da177e4 | 261 | { |
89bddce5 | 262 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
1da177e4 | 263 | |
89bddce5 SH |
264 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) |
265 | == SLAB_CTOR_CONSTRUCTOR) | |
1da177e4 LT |
266 | inode_init_once(&ei->vfs_inode); |
267 | } | |
89bddce5 | 268 | |
1da177e4 LT |
269 | static int init_inodecache(void) |
270 | { | |
271 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
89bddce5 SH |
272 | sizeof(struct socket_alloc), |
273 | 0, | |
274 | (SLAB_HWCACHE_ALIGN | | |
275 | SLAB_RECLAIM_ACCOUNT | | |
276 | SLAB_MEM_SPREAD), | |
277 | init_once, | |
278 | NULL); | |
1da177e4 LT |
279 | if (sock_inode_cachep == NULL) |
280 | return -ENOMEM; | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static struct super_operations sockfs_ops = { | |
285 | .alloc_inode = sock_alloc_inode, | |
286 | .destroy_inode =sock_destroy_inode, | |
287 | .statfs = simple_statfs, | |
288 | }; | |
289 | ||
454e2398 | 290 | static int sockfs_get_sb(struct file_system_type *fs_type, |
89bddce5 SH |
291 | int flags, const char *dev_name, void *data, |
292 | struct vfsmount *mnt) | |
1da177e4 | 293 | { |
454e2398 DH |
294 | return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, |
295 | mnt); | |
1da177e4 LT |
296 | } |
297 | ||
ba89966c | 298 | static struct vfsmount *sock_mnt __read_mostly; |
1da177e4 LT |
299 | |
300 | static struct file_system_type sock_fs_type = { | |
301 | .name = "sockfs", | |
302 | .get_sb = sockfs_get_sb, | |
303 | .kill_sb = kill_anon_super, | |
304 | }; | |
89bddce5 | 305 | |
1da177e4 LT |
306 | static int sockfs_delete_dentry(struct dentry *dentry) |
307 | { | |
304e61e6 ED |
308 | /* |
309 | * At creation time, we pretended this dentry was hashed | |
310 | * (by clearing DCACHE_UNHASHED bit in d_flags) | |
311 | * At delete time, we restore the truth : not hashed. | |
312 | * (so that dput() can proceed correctly) | |
313 | */ | |
314 | dentry->d_flags |= DCACHE_UNHASHED; | |
315 | return 0; | |
1da177e4 LT |
316 | } |
317 | static struct dentry_operations sockfs_dentry_operations = { | |
89bddce5 | 318 | .d_delete = sockfs_delete_dentry, |
1da177e4 LT |
319 | }; |
320 | ||
321 | /* | |
322 | * Obtains the first available file descriptor and sets it up for use. | |
323 | * | |
39d8c1b6 DM |
324 | * These functions create file structures and maps them to fd space |
325 | * of the current process. On success it returns file descriptor | |
1da177e4 LT |
326 | * and file struct implicitly stored in sock->file. |
327 | * Note that another thread may close file descriptor before we return | |
328 | * from this function. We use the fact that now we do not refer | |
329 | * to socket after mapping. If one day we will need it, this | |
330 | * function will increment ref. count on file by 1. | |
331 | * | |
332 | * In any case returned fd MAY BE not valid! | |
333 | * This race condition is unavoidable | |
334 | * with shared fd spaces, we cannot solve it inside kernel, | |
335 | * but we take care of internal coherence yet. | |
336 | */ | |
337 | ||
39d8c1b6 | 338 | static int sock_alloc_fd(struct file **filep) |
1da177e4 LT |
339 | { |
340 | int fd; | |
1da177e4 LT |
341 | |
342 | fd = get_unused_fd(); | |
39d8c1b6 | 343 | if (likely(fd >= 0)) { |
1da177e4 LT |
344 | struct file *file = get_empty_filp(); |
345 | ||
39d8c1b6 DM |
346 | *filep = file; |
347 | if (unlikely(!file)) { | |
1da177e4 | 348 | put_unused_fd(fd); |
39d8c1b6 | 349 | return -ENFILE; |
1da177e4 | 350 | } |
39d8c1b6 DM |
351 | } else |
352 | *filep = NULL; | |
353 | return fd; | |
354 | } | |
1da177e4 | 355 | |
39d8c1b6 DM |
356 | static int sock_attach_fd(struct socket *sock, struct file *file) |
357 | { | |
358 | struct qstr this; | |
359 | char name[32]; | |
360 | ||
361 | this.len = sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino); | |
362 | this.name = name; | |
304e61e6 | 363 | this.hash = 0; |
39d8c1b6 | 364 | |
3126a42c JS |
365 | file->f_path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); |
366 | if (unlikely(!file->f_path.dentry)) | |
39d8c1b6 DM |
367 | return -ENOMEM; |
368 | ||
3126a42c | 369 | file->f_path.dentry->d_op = &sockfs_dentry_operations; |
304e61e6 ED |
370 | /* |
371 | * We dont want to push this dentry into global dentry hash table. | |
372 | * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED | |
373 | * This permits a working /proc/$pid/fd/XXX on sockets | |
374 | */ | |
3126a42c JS |
375 | file->f_path.dentry->d_flags &= ~DCACHE_UNHASHED; |
376 | d_instantiate(file->f_path.dentry, SOCK_INODE(sock)); | |
377 | file->f_path.mnt = mntget(sock_mnt); | |
378 | file->f_mapping = file->f_path.dentry->d_inode->i_mapping; | |
39d8c1b6 DM |
379 | |
380 | sock->file = file; | |
381 | file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; | |
382 | file->f_mode = FMODE_READ | FMODE_WRITE; | |
383 | file->f_flags = O_RDWR; | |
384 | file->f_pos = 0; | |
385 | file->private_data = sock; | |
1da177e4 | 386 | |
39d8c1b6 DM |
387 | return 0; |
388 | } | |
389 | ||
390 | int sock_map_fd(struct socket *sock) | |
391 | { | |
392 | struct file *newfile; | |
393 | int fd = sock_alloc_fd(&newfile); | |
394 | ||
395 | if (likely(fd >= 0)) { | |
396 | int err = sock_attach_fd(sock, newfile); | |
397 | ||
398 | if (unlikely(err < 0)) { | |
399 | put_filp(newfile); | |
1da177e4 | 400 | put_unused_fd(fd); |
39d8c1b6 | 401 | return err; |
1da177e4 | 402 | } |
39d8c1b6 | 403 | fd_install(fd, newfile); |
1da177e4 | 404 | } |
1da177e4 LT |
405 | return fd; |
406 | } | |
407 | ||
6cb153ca BL |
408 | static struct socket *sock_from_file(struct file *file, int *err) |
409 | { | |
6cb153ca BL |
410 | if (file->f_op == &socket_file_ops) |
411 | return file->private_data; /* set in sock_map_fd */ | |
412 | ||
23bb80d2 ED |
413 | *err = -ENOTSOCK; |
414 | return NULL; | |
6cb153ca BL |
415 | } |
416 | ||
1da177e4 LT |
417 | /** |
418 | * sockfd_lookup - Go from a file number to its socket slot | |
419 | * @fd: file handle | |
420 | * @err: pointer to an error code return | |
421 | * | |
422 | * The file handle passed in is locked and the socket it is bound | |
423 | * too is returned. If an error occurs the err pointer is overwritten | |
424 | * with a negative errno code and NULL is returned. The function checks | |
425 | * for both invalid handles and passing a handle which is not a socket. | |
426 | * | |
427 | * On a success the socket object pointer is returned. | |
428 | */ | |
429 | ||
430 | struct socket *sockfd_lookup(int fd, int *err) | |
431 | { | |
432 | struct file *file; | |
1da177e4 LT |
433 | struct socket *sock; |
434 | ||
89bddce5 SH |
435 | file = fget(fd); |
436 | if (!file) { | |
1da177e4 LT |
437 | *err = -EBADF; |
438 | return NULL; | |
439 | } | |
89bddce5 | 440 | |
6cb153ca BL |
441 | sock = sock_from_file(file, err); |
442 | if (!sock) | |
1da177e4 | 443 | fput(file); |
6cb153ca BL |
444 | return sock; |
445 | } | |
1da177e4 | 446 | |
6cb153ca BL |
447 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
448 | { | |
449 | struct file *file; | |
450 | struct socket *sock; | |
451 | ||
3672558c | 452 | *err = -EBADF; |
6cb153ca BL |
453 | file = fget_light(fd, fput_needed); |
454 | if (file) { | |
455 | sock = sock_from_file(file, err); | |
456 | if (sock) | |
457 | return sock; | |
458 | fput_light(file, *fput_needed); | |
1da177e4 | 459 | } |
6cb153ca | 460 | return NULL; |
1da177e4 LT |
461 | } |
462 | ||
463 | /** | |
464 | * sock_alloc - allocate a socket | |
89bddce5 | 465 | * |
1da177e4 LT |
466 | * Allocate a new inode and socket object. The two are bound together |
467 | * and initialised. The socket is then returned. If we are out of inodes | |
468 | * NULL is returned. | |
469 | */ | |
470 | ||
471 | static struct socket *sock_alloc(void) | |
472 | { | |
89bddce5 SH |
473 | struct inode *inode; |
474 | struct socket *sock; | |
1da177e4 LT |
475 | |
476 | inode = new_inode(sock_mnt->mnt_sb); | |
477 | if (!inode) | |
478 | return NULL; | |
479 | ||
480 | sock = SOCKET_I(inode); | |
481 | ||
89bddce5 | 482 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
1da177e4 LT |
483 | inode->i_uid = current->fsuid; |
484 | inode->i_gid = current->fsgid; | |
485 | ||
486 | get_cpu_var(sockets_in_use)++; | |
487 | put_cpu_var(sockets_in_use); | |
488 | return sock; | |
489 | } | |
490 | ||
491 | /* | |
492 | * In theory you can't get an open on this inode, but /proc provides | |
493 | * a back door. Remember to keep it shut otherwise you'll let the | |
494 | * creepy crawlies in. | |
495 | */ | |
89bddce5 | 496 | |
1da177e4 LT |
497 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
498 | { | |
499 | return -ENXIO; | |
500 | } | |
501 | ||
4b6f5d20 | 502 | const struct file_operations bad_sock_fops = { |
1da177e4 LT |
503 | .owner = THIS_MODULE, |
504 | .open = sock_no_open, | |
505 | }; | |
506 | ||
507 | /** | |
508 | * sock_release - close a socket | |
509 | * @sock: socket to close | |
510 | * | |
511 | * The socket is released from the protocol stack if it has a release | |
512 | * callback, and the inode is then released if the socket is bound to | |
89bddce5 | 513 | * an inode not a file. |
1da177e4 | 514 | */ |
89bddce5 | 515 | |
1da177e4 LT |
516 | void sock_release(struct socket *sock) |
517 | { | |
518 | if (sock->ops) { | |
519 | struct module *owner = sock->ops->owner; | |
520 | ||
521 | sock->ops->release(sock); | |
522 | sock->ops = NULL; | |
523 | module_put(owner); | |
524 | } | |
525 | ||
526 | if (sock->fasync_list) | |
527 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); | |
528 | ||
529 | get_cpu_var(sockets_in_use)--; | |
530 | put_cpu_var(sockets_in_use); | |
531 | if (!sock->file) { | |
532 | iput(SOCK_INODE(sock)); | |
533 | return; | |
534 | } | |
89bddce5 | 535 | sock->file = NULL; |
1da177e4 LT |
536 | } |
537 | ||
89bddce5 | 538 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
539 | struct msghdr *msg, size_t size) |
540 | { | |
541 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
542 | int err; | |
543 | ||
544 | si->sock = sock; | |
545 | si->scm = NULL; | |
546 | si->msg = msg; | |
547 | si->size = size; | |
548 | ||
549 | err = security_socket_sendmsg(sock, msg, size); | |
550 | if (err) | |
551 | return err; | |
552 | ||
553 | return sock->ops->sendmsg(iocb, sock, msg, size); | |
554 | } | |
555 | ||
556 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | |
557 | { | |
558 | struct kiocb iocb; | |
559 | struct sock_iocb siocb; | |
560 | int ret; | |
561 | ||
562 | init_sync_kiocb(&iocb, NULL); | |
563 | iocb.private = &siocb; | |
564 | ret = __sock_sendmsg(&iocb, sock, msg, size); | |
565 | if (-EIOCBQUEUED == ret) | |
566 | ret = wait_on_sync_kiocb(&iocb); | |
567 | return ret; | |
568 | } | |
569 | ||
570 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
571 | struct kvec *vec, size_t num, size_t size) | |
572 | { | |
573 | mm_segment_t oldfs = get_fs(); | |
574 | int result; | |
575 | ||
576 | set_fs(KERNEL_DS); | |
577 | /* | |
578 | * the following is safe, since for compiler definitions of kvec and | |
579 | * iovec are identical, yielding the same in-core layout and alignment | |
580 | */ | |
89bddce5 | 581 | msg->msg_iov = (struct iovec *)vec; |
1da177e4 LT |
582 | msg->msg_iovlen = num; |
583 | result = sock_sendmsg(sock, msg, size); | |
584 | set_fs(oldfs); | |
585 | return result; | |
586 | } | |
587 | ||
92f37fd2 ED |
588 | /* |
589 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
590 | */ | |
591 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
592 | struct sk_buff *skb) | |
593 | { | |
594 | ktime_t kt = skb->tstamp; | |
595 | ||
596 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
597 | struct timeval tv; | |
598 | /* Race occurred between timestamp enabling and packet | |
599 | receiving. Fill in the current time for now. */ | |
600 | if (kt.tv64 == 0) | |
601 | kt = ktime_get_real(); | |
602 | skb->tstamp = kt; | |
603 | tv = ktime_to_timeval(kt); | |
604 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv); | |
605 | } else { | |
606 | struct timespec ts; | |
607 | /* Race occurred between timestamp enabling and packet | |
608 | receiving. Fill in the current time for now. */ | |
609 | if (kt.tv64 == 0) | |
610 | kt = ktime_get_real(); | |
611 | skb->tstamp = kt; | |
612 | ts = ktime_to_timespec(kt); | |
613 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts); | |
614 | } | |
615 | } | |
616 | ||
89bddce5 | 617 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
618 | struct msghdr *msg, size_t size, int flags) |
619 | { | |
620 | int err; | |
621 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
622 | ||
623 | si->sock = sock; | |
624 | si->scm = NULL; | |
625 | si->msg = msg; | |
626 | si->size = size; | |
627 | si->flags = flags; | |
628 | ||
629 | err = security_socket_recvmsg(sock, msg, size, flags); | |
630 | if (err) | |
631 | return err; | |
632 | ||
633 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); | |
634 | } | |
635 | ||
89bddce5 | 636 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1da177e4 LT |
637 | size_t size, int flags) |
638 | { | |
639 | struct kiocb iocb; | |
640 | struct sock_iocb siocb; | |
641 | int ret; | |
642 | ||
89bddce5 | 643 | init_sync_kiocb(&iocb, NULL); |
1da177e4 LT |
644 | iocb.private = &siocb; |
645 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); | |
646 | if (-EIOCBQUEUED == ret) | |
647 | ret = wait_on_sync_kiocb(&iocb); | |
648 | return ret; | |
649 | } | |
650 | ||
89bddce5 SH |
651 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
652 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 LT |
653 | { |
654 | mm_segment_t oldfs = get_fs(); | |
655 | int result; | |
656 | ||
657 | set_fs(KERNEL_DS); | |
658 | /* | |
659 | * the following is safe, since for compiler definitions of kvec and | |
660 | * iovec are identical, yielding the same in-core layout and alignment | |
661 | */ | |
89bddce5 | 662 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
1da177e4 LT |
663 | result = sock_recvmsg(sock, msg, size, flags); |
664 | set_fs(oldfs); | |
665 | return result; | |
666 | } | |
667 | ||
668 | static void sock_aio_dtor(struct kiocb *iocb) | |
669 | { | |
670 | kfree(iocb->private); | |
671 | } | |
672 | ||
ce1d4d3e CH |
673 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
674 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 675 | { |
1da177e4 LT |
676 | struct socket *sock; |
677 | int flags; | |
678 | ||
ce1d4d3e CH |
679 | sock = file->private_data; |
680 | ||
681 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
682 | if (more) | |
683 | flags |= MSG_MORE; | |
684 | ||
685 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
686 | } | |
1da177e4 | 687 | |
ce1d4d3e | 688 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
89bddce5 | 689 | struct sock_iocb *siocb) |
ce1d4d3e CH |
690 | { |
691 | if (!is_sync_kiocb(iocb)) { | |
692 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); | |
693 | if (!siocb) | |
694 | return NULL; | |
1da177e4 LT |
695 | iocb->ki_dtor = sock_aio_dtor; |
696 | } | |
1da177e4 | 697 | |
ce1d4d3e | 698 | siocb->kiocb = iocb; |
ce1d4d3e CH |
699 | iocb->private = siocb; |
700 | return siocb; | |
1da177e4 LT |
701 | } |
702 | ||
ce1d4d3e | 703 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
704 | struct file *file, const struct iovec *iov, |
705 | unsigned long nr_segs) | |
ce1d4d3e CH |
706 | { |
707 | struct socket *sock = file->private_data; | |
708 | size_t size = 0; | |
709 | int i; | |
1da177e4 | 710 | |
89bddce5 SH |
711 | for (i = 0; i < nr_segs; i++) |
712 | size += iov[i].iov_len; | |
1da177e4 | 713 | |
ce1d4d3e CH |
714 | msg->msg_name = NULL; |
715 | msg->msg_namelen = 0; | |
716 | msg->msg_control = NULL; | |
717 | msg->msg_controllen = 0; | |
89bddce5 | 718 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
719 | msg->msg_iovlen = nr_segs; |
720 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
721 | ||
722 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); | |
723 | } | |
724 | ||
027445c3 BP |
725 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
726 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
727 | { |
728 | struct sock_iocb siocb, *x; | |
729 | ||
1da177e4 LT |
730 | if (pos != 0) |
731 | return -ESPIPE; | |
027445c3 BP |
732 | |
733 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
1da177e4 LT |
734 | return 0; |
735 | ||
027445c3 BP |
736 | |
737 | x = alloc_sock_iocb(iocb, &siocb); | |
ce1d4d3e CH |
738 | if (!x) |
739 | return -ENOMEM; | |
027445c3 | 740 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
741 | } |
742 | ||
ce1d4d3e | 743 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
744 | struct file *file, const struct iovec *iov, |
745 | unsigned long nr_segs) | |
1da177e4 | 746 | { |
ce1d4d3e CH |
747 | struct socket *sock = file->private_data; |
748 | size_t size = 0; | |
749 | int i; | |
1da177e4 | 750 | |
89bddce5 SH |
751 | for (i = 0; i < nr_segs; i++) |
752 | size += iov[i].iov_len; | |
1da177e4 | 753 | |
ce1d4d3e CH |
754 | msg->msg_name = NULL; |
755 | msg->msg_namelen = 0; | |
756 | msg->msg_control = NULL; | |
757 | msg->msg_controllen = 0; | |
89bddce5 | 758 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
759 | msg->msg_iovlen = nr_segs; |
760 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
761 | if (sock->type == SOCK_SEQPACKET) | |
762 | msg->msg_flags |= MSG_EOR; | |
1da177e4 | 763 | |
ce1d4d3e | 764 | return __sock_sendmsg(iocb, sock, msg, size); |
1da177e4 LT |
765 | } |
766 | ||
027445c3 BP |
767 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
768 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
769 | { |
770 | struct sock_iocb siocb, *x; | |
1da177e4 | 771 | |
ce1d4d3e CH |
772 | if (pos != 0) |
773 | return -ESPIPE; | |
027445c3 BP |
774 | |
775 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
ce1d4d3e | 776 | return 0; |
1da177e4 | 777 | |
027445c3 | 778 | x = alloc_sock_iocb(iocb, &siocb); |
ce1d4d3e CH |
779 | if (!x) |
780 | return -ENOMEM; | |
1da177e4 | 781 | |
027445c3 | 782 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
783 | } |
784 | ||
1da177e4 LT |
785 | /* |
786 | * Atomic setting of ioctl hooks to avoid race | |
787 | * with module unload. | |
788 | */ | |
789 | ||
4a3e2f71 | 790 | static DEFINE_MUTEX(br_ioctl_mutex); |
89bddce5 | 791 | static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL; |
1da177e4 | 792 | |
89bddce5 | 793 | void brioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 794 | { |
4a3e2f71 | 795 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 796 | br_ioctl_hook = hook; |
4a3e2f71 | 797 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 | 798 | } |
89bddce5 | 799 | |
1da177e4 LT |
800 | EXPORT_SYMBOL(brioctl_set); |
801 | ||
4a3e2f71 | 802 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
89bddce5 | 803 | static int (*vlan_ioctl_hook) (void __user *arg); |
1da177e4 | 804 | |
89bddce5 | 805 | void vlan_ioctl_set(int (*hook) (void __user *)) |
1da177e4 | 806 | { |
4a3e2f71 | 807 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 808 | vlan_ioctl_hook = hook; |
4a3e2f71 | 809 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 810 | } |
89bddce5 | 811 | |
1da177e4 LT |
812 | EXPORT_SYMBOL(vlan_ioctl_set); |
813 | ||
4a3e2f71 | 814 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
89bddce5 | 815 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1da177e4 | 816 | |
89bddce5 | 817 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 818 | { |
4a3e2f71 | 819 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 820 | dlci_ioctl_hook = hook; |
4a3e2f71 | 821 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 | 822 | } |
89bddce5 | 823 | |
1da177e4 LT |
824 | EXPORT_SYMBOL(dlci_ioctl_set); |
825 | ||
826 | /* | |
827 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
828 | * what to do with it - that's up to the protocol still. | |
829 | */ | |
830 | ||
831 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
832 | { | |
833 | struct socket *sock; | |
834 | void __user *argp = (void __user *)arg; | |
835 | int pid, err; | |
836 | ||
b69aee04 | 837 | sock = file->private_data; |
1da177e4 LT |
838 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
839 | err = dev_ioctl(cmd, argp); | |
840 | } else | |
d86b5e0e | 841 | #ifdef CONFIG_WIRELESS_EXT |
1da177e4 LT |
842 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
843 | err = dev_ioctl(cmd, argp); | |
844 | } else | |
89bddce5 SH |
845 | #endif /* CONFIG_WIRELESS_EXT */ |
846 | switch (cmd) { | |
1da177e4 LT |
847 | case FIOSETOWN: |
848 | case SIOCSPGRP: | |
849 | err = -EFAULT; | |
850 | if (get_user(pid, (int __user *)argp)) | |
851 | break; | |
852 | err = f_setown(sock->file, pid, 1); | |
853 | break; | |
854 | case FIOGETOWN: | |
855 | case SIOCGPGRP: | |
609d7fa9 | 856 | err = put_user(f_getown(sock->file), |
89bddce5 | 857 | (int __user *)argp); |
1da177e4 LT |
858 | break; |
859 | case SIOCGIFBR: | |
860 | case SIOCSIFBR: | |
861 | case SIOCBRADDBR: | |
862 | case SIOCBRDELBR: | |
863 | err = -ENOPKG; | |
864 | if (!br_ioctl_hook) | |
865 | request_module("bridge"); | |
866 | ||
4a3e2f71 | 867 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 868 | if (br_ioctl_hook) |
1da177e4 | 869 | err = br_ioctl_hook(cmd, argp); |
4a3e2f71 | 870 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
871 | break; |
872 | case SIOCGIFVLAN: | |
873 | case SIOCSIFVLAN: | |
874 | err = -ENOPKG; | |
875 | if (!vlan_ioctl_hook) | |
876 | request_module("8021q"); | |
877 | ||
4a3e2f71 | 878 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 LT |
879 | if (vlan_ioctl_hook) |
880 | err = vlan_ioctl_hook(argp); | |
4a3e2f71 | 881 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 882 | break; |
1da177e4 LT |
883 | case SIOCADDDLCI: |
884 | case SIOCDELDLCI: | |
885 | err = -ENOPKG; | |
886 | if (!dlci_ioctl_hook) | |
887 | request_module("dlci"); | |
888 | ||
889 | if (dlci_ioctl_hook) { | |
4a3e2f71 | 890 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 891 | err = dlci_ioctl_hook(cmd, argp); |
4a3e2f71 | 892 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 LT |
893 | } |
894 | break; | |
895 | default: | |
896 | err = sock->ops->ioctl(sock, cmd, arg); | |
b5e5fa5e CH |
897 | |
898 | /* | |
899 | * If this ioctl is unknown try to hand it down | |
900 | * to the NIC driver. | |
901 | */ | |
902 | if (err == -ENOIOCTLCMD) | |
903 | err = dev_ioctl(cmd, argp); | |
1da177e4 | 904 | break; |
89bddce5 | 905 | } |
1da177e4 LT |
906 | return err; |
907 | } | |
908 | ||
909 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
910 | { | |
911 | int err; | |
912 | struct socket *sock = NULL; | |
89bddce5 | 913 | |
1da177e4 LT |
914 | err = security_socket_create(family, type, protocol, 1); |
915 | if (err) | |
916 | goto out; | |
917 | ||
918 | sock = sock_alloc(); | |
919 | if (!sock) { | |
920 | err = -ENOMEM; | |
921 | goto out; | |
922 | } | |
923 | ||
1da177e4 | 924 | sock->type = type; |
7420ed23 VY |
925 | err = security_socket_post_create(sock, family, type, protocol, 1); |
926 | if (err) | |
927 | goto out_release; | |
928 | ||
1da177e4 LT |
929 | out: |
930 | *res = sock; | |
931 | return err; | |
7420ed23 VY |
932 | out_release: |
933 | sock_release(sock); | |
934 | sock = NULL; | |
935 | goto out; | |
1da177e4 LT |
936 | } |
937 | ||
938 | /* No kernel lock held - perfect */ | |
89bddce5 | 939 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
940 | { |
941 | struct socket *sock; | |
942 | ||
943 | /* | |
89bddce5 | 944 | * We can't return errors to poll, so it's either yes or no. |
1da177e4 | 945 | */ |
b69aee04 | 946 | sock = file->private_data; |
1da177e4 LT |
947 | return sock->ops->poll(file, sock, wait); |
948 | } | |
949 | ||
89bddce5 | 950 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 951 | { |
b69aee04 | 952 | struct socket *sock = file->private_data; |
1da177e4 LT |
953 | |
954 | return sock->ops->mmap(file, sock, vma); | |
955 | } | |
956 | ||
20380731 | 957 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
958 | { |
959 | /* | |
89bddce5 SH |
960 | * It was possible the inode is NULL we were |
961 | * closing an unfinished socket. | |
1da177e4 LT |
962 | */ |
963 | ||
89bddce5 | 964 | if (!inode) { |
1da177e4 LT |
965 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
966 | return 0; | |
967 | } | |
968 | sock_fasync(-1, filp, 0); | |
969 | sock_release(SOCKET_I(inode)); | |
970 | return 0; | |
971 | } | |
972 | ||
973 | /* | |
974 | * Update the socket async list | |
975 | * | |
976 | * Fasync_list locking strategy. | |
977 | * | |
978 | * 1. fasync_list is modified only under process context socket lock | |
979 | * i.e. under semaphore. | |
980 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
981 | * or under socket lock. | |
982 | * 3. fasync_list can be used from softirq context, so that | |
983 | * modification under socket lock have to be enhanced with | |
984 | * write_lock_bh(&sk->sk_callback_lock). | |
985 | * --ANK (990710) | |
986 | */ | |
987 | ||
988 | static int sock_fasync(int fd, struct file *filp, int on) | |
989 | { | |
89bddce5 | 990 | struct fasync_struct *fa, *fna = NULL, **prev; |
1da177e4 LT |
991 | struct socket *sock; |
992 | struct sock *sk; | |
993 | ||
89bddce5 | 994 | if (on) { |
8b3a7005 | 995 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
89bddce5 | 996 | if (fna == NULL) |
1da177e4 LT |
997 | return -ENOMEM; |
998 | } | |
999 | ||
b69aee04 | 1000 | sock = filp->private_data; |
1da177e4 | 1001 | |
89bddce5 SH |
1002 | sk = sock->sk; |
1003 | if (sk == NULL) { | |
1da177e4 LT |
1004 | kfree(fna); |
1005 | return -EINVAL; | |
1006 | } | |
1007 | ||
1008 | lock_sock(sk); | |
1009 | ||
89bddce5 | 1010 | prev = &(sock->fasync_list); |
1da177e4 | 1011 | |
89bddce5 SH |
1012 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) |
1013 | if (fa->fa_file == filp) | |
1da177e4 LT |
1014 | break; |
1015 | ||
89bddce5 SH |
1016 | if (on) { |
1017 | if (fa != NULL) { | |
1da177e4 | 1018 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1019 | fa->fa_fd = fd; |
1da177e4 LT |
1020 | write_unlock_bh(&sk->sk_callback_lock); |
1021 | ||
1022 | kfree(fna); | |
1023 | goto out; | |
1024 | } | |
89bddce5 SH |
1025 | fna->fa_file = filp; |
1026 | fna->fa_fd = fd; | |
1027 | fna->magic = FASYNC_MAGIC; | |
1028 | fna->fa_next = sock->fasync_list; | |
1da177e4 | 1029 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1030 | sock->fasync_list = fna; |
1da177e4 | 1031 | write_unlock_bh(&sk->sk_callback_lock); |
89bddce5 SH |
1032 | } else { |
1033 | if (fa != NULL) { | |
1da177e4 | 1034 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1035 | *prev = fa->fa_next; |
1da177e4 LT |
1036 | write_unlock_bh(&sk->sk_callback_lock); |
1037 | kfree(fa); | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | out: | |
1042 | release_sock(sock->sk); | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | /* This function may be called only under socket lock or callback_lock */ | |
1047 | ||
1048 | int sock_wake_async(struct socket *sock, int how, int band) | |
1049 | { | |
1050 | if (!sock || !sock->fasync_list) | |
1051 | return -1; | |
89bddce5 | 1052 | switch (how) { |
1da177e4 | 1053 | case 1: |
89bddce5 | 1054 | |
1da177e4 LT |
1055 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1056 | break; | |
1057 | goto call_kill; | |
1058 | case 2: | |
1059 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) | |
1060 | break; | |
1061 | /* fall through */ | |
1062 | case 0: | |
89bddce5 | 1063 | call_kill: |
1da177e4 LT |
1064 | __kill_fasync(sock->fasync_list, SIGIO, band); |
1065 | break; | |
1066 | case 3: | |
1067 | __kill_fasync(sock->fasync_list, SIGURG, band); | |
1068 | } | |
1069 | return 0; | |
1070 | } | |
1071 | ||
89bddce5 SH |
1072 | static int __sock_create(int family, int type, int protocol, |
1073 | struct socket **res, int kern) | |
1da177e4 LT |
1074 | { |
1075 | int err; | |
1076 | struct socket *sock; | |
55737fda | 1077 | const struct net_proto_family *pf; |
1da177e4 LT |
1078 | |
1079 | /* | |
89bddce5 | 1080 | * Check protocol is in range |
1da177e4 LT |
1081 | */ |
1082 | if (family < 0 || family >= NPROTO) | |
1083 | return -EAFNOSUPPORT; | |
1084 | if (type < 0 || type >= SOCK_MAX) | |
1085 | return -EINVAL; | |
1086 | ||
1087 | /* Compatibility. | |
1088 | ||
1089 | This uglymoron is moved from INET layer to here to avoid | |
1090 | deadlock in module load. | |
1091 | */ | |
1092 | if (family == PF_INET && type == SOCK_PACKET) { | |
89bddce5 | 1093 | static int warned; |
1da177e4 LT |
1094 | if (!warned) { |
1095 | warned = 1; | |
89bddce5 SH |
1096 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1097 | current->comm); | |
1da177e4 LT |
1098 | } |
1099 | family = PF_PACKET; | |
1100 | } | |
1101 | ||
1102 | err = security_socket_create(family, type, protocol, kern); | |
1103 | if (err) | |
1104 | return err; | |
89bddce5 | 1105 | |
55737fda SH |
1106 | /* |
1107 | * Allocate the socket and allow the family to set things up. if | |
1108 | * the protocol is 0, the family is instructed to select an appropriate | |
1109 | * default. | |
1110 | */ | |
1111 | sock = sock_alloc(); | |
1112 | if (!sock) { | |
1113 | if (net_ratelimit()) | |
1114 | printk(KERN_WARNING "socket: no more sockets\n"); | |
1115 | return -ENFILE; /* Not exactly a match, but its the | |
1116 | closest posix thing */ | |
1117 | } | |
1118 | ||
1119 | sock->type = type; | |
1120 | ||
1da177e4 | 1121 | #if defined(CONFIG_KMOD) |
89bddce5 SH |
1122 | /* Attempt to load a protocol module if the find failed. |
1123 | * | |
1124 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1125 | * requested real, full-featured networking support upon configuration. |
1126 | * Otherwise module support will break! | |
1127 | */ | |
55737fda | 1128 | if (net_families[family] == NULL) |
89bddce5 | 1129 | request_module("net-pf-%d", family); |
1da177e4 LT |
1130 | #endif |
1131 | ||
55737fda SH |
1132 | rcu_read_lock(); |
1133 | pf = rcu_dereference(net_families[family]); | |
1134 | err = -EAFNOSUPPORT; | |
1135 | if (!pf) | |
1136 | goto out_release; | |
1da177e4 LT |
1137 | |
1138 | /* | |
1139 | * We will call the ->create function, that possibly is in a loadable | |
1140 | * module, so we have to bump that loadable module refcnt first. | |
1141 | */ | |
55737fda | 1142 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1143 | goto out_release; |
1144 | ||
55737fda SH |
1145 | /* Now protected by module ref count */ |
1146 | rcu_read_unlock(); | |
1147 | ||
1148 | err = pf->create(sock, protocol); | |
1149 | if (err < 0) | |
1da177e4 | 1150 | goto out_module_put; |
a79af59e | 1151 | |
1da177e4 LT |
1152 | /* |
1153 | * Now to bump the refcnt of the [loadable] module that owns this | |
1154 | * socket at sock_release time we decrement its refcnt. | |
1155 | */ | |
55737fda SH |
1156 | if (!try_module_get(sock->ops->owner)) |
1157 | goto out_module_busy; | |
1158 | ||
1da177e4 LT |
1159 | /* |
1160 | * Now that we're done with the ->create function, the [loadable] | |
1161 | * module can have its refcnt decremented | |
1162 | */ | |
55737fda | 1163 | module_put(pf->owner); |
7420ed23 VY |
1164 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1165 | if (err) | |
1166 | goto out_release; | |
55737fda | 1167 | *res = sock; |
1da177e4 | 1168 | |
55737fda SH |
1169 | return 0; |
1170 | ||
1171 | out_module_busy: | |
1172 | err = -EAFNOSUPPORT; | |
1da177e4 | 1173 | out_module_put: |
55737fda SH |
1174 | sock->ops = NULL; |
1175 | module_put(pf->owner); | |
1176 | out_sock_release: | |
1da177e4 | 1177 | sock_release(sock); |
55737fda SH |
1178 | return err; |
1179 | ||
1180 | out_release: | |
1181 | rcu_read_unlock(); | |
1182 | goto out_sock_release; | |
1da177e4 LT |
1183 | } |
1184 | ||
1185 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1186 | { | |
1187 | return __sock_create(family, type, protocol, res, 0); | |
1188 | } | |
1189 | ||
1190 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1191 | { | |
1192 | return __sock_create(family, type, protocol, res, 1); | |
1193 | } | |
1194 | ||
1195 | asmlinkage long sys_socket(int family, int type, int protocol) | |
1196 | { | |
1197 | int retval; | |
1198 | struct socket *sock; | |
1199 | ||
1200 | retval = sock_create(family, type, protocol, &sock); | |
1201 | if (retval < 0) | |
1202 | goto out; | |
1203 | ||
1204 | retval = sock_map_fd(sock); | |
1205 | if (retval < 0) | |
1206 | goto out_release; | |
1207 | ||
1208 | out: | |
1209 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1210 | return retval; | |
1211 | ||
1212 | out_release: | |
1213 | sock_release(sock); | |
1214 | return retval; | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * Create a pair of connected sockets. | |
1219 | */ | |
1220 | ||
89bddce5 SH |
1221 | asmlinkage long sys_socketpair(int family, int type, int protocol, |
1222 | int __user *usockvec) | |
1da177e4 LT |
1223 | { |
1224 | struct socket *sock1, *sock2; | |
1225 | int fd1, fd2, err; | |
db349509 | 1226 | struct file *newfile1, *newfile2; |
1da177e4 LT |
1227 | |
1228 | /* | |
1229 | * Obtain the first socket and check if the underlying protocol | |
1230 | * supports the socketpair call. | |
1231 | */ | |
1232 | ||
1233 | err = sock_create(family, type, protocol, &sock1); | |
1234 | if (err < 0) | |
1235 | goto out; | |
1236 | ||
1237 | err = sock_create(family, type, protocol, &sock2); | |
1238 | if (err < 0) | |
1239 | goto out_release_1; | |
1240 | ||
1241 | err = sock1->ops->socketpair(sock1, sock2); | |
89bddce5 | 1242 | if (err < 0) |
1da177e4 LT |
1243 | goto out_release_both; |
1244 | ||
db349509 AV |
1245 | fd1 = sock_alloc_fd(&newfile1); |
1246 | if (unlikely(fd1 < 0)) | |
1247 | goto out_release_both; | |
1da177e4 | 1248 | |
db349509 AV |
1249 | fd2 = sock_alloc_fd(&newfile2); |
1250 | if (unlikely(fd2 < 0)) { | |
1251 | put_filp(newfile1); | |
1252 | put_unused_fd(fd1); | |
1da177e4 | 1253 | goto out_release_both; |
db349509 | 1254 | } |
1da177e4 | 1255 | |
db349509 AV |
1256 | err = sock_attach_fd(sock1, newfile1); |
1257 | if (unlikely(err < 0)) { | |
1258 | goto out_fd2; | |
1259 | } | |
1260 | ||
1261 | err = sock_attach_fd(sock2, newfile2); | |
1262 | if (unlikely(err < 0)) { | |
1263 | fput(newfile1); | |
1264 | goto out_fd1; | |
1265 | } | |
1266 | ||
1267 | err = audit_fd_pair(fd1, fd2); | |
1268 | if (err < 0) { | |
1269 | fput(newfile1); | |
1270 | fput(newfile2); | |
1271 | goto out_fd; | |
1272 | } | |
1da177e4 | 1273 | |
db349509 AV |
1274 | fd_install(fd1, newfile1); |
1275 | fd_install(fd2, newfile2); | |
1da177e4 LT |
1276 | /* fd1 and fd2 may be already another descriptors. |
1277 | * Not kernel problem. | |
1278 | */ | |
1279 | ||
89bddce5 | 1280 | err = put_user(fd1, &usockvec[0]); |
1da177e4 LT |
1281 | if (!err) |
1282 | err = put_user(fd2, &usockvec[1]); | |
1283 | if (!err) | |
1284 | return 0; | |
1285 | ||
1286 | sys_close(fd2); | |
1287 | sys_close(fd1); | |
1288 | return err; | |
1289 | ||
1da177e4 | 1290 | out_release_both: |
89bddce5 | 1291 | sock_release(sock2); |
1da177e4 | 1292 | out_release_1: |
89bddce5 | 1293 | sock_release(sock1); |
1da177e4 LT |
1294 | out: |
1295 | return err; | |
db349509 AV |
1296 | |
1297 | out_fd2: | |
1298 | put_filp(newfile1); | |
1299 | sock_release(sock1); | |
1300 | out_fd1: | |
1301 | put_filp(newfile2); | |
1302 | sock_release(sock2); | |
1303 | out_fd: | |
1304 | put_unused_fd(fd1); | |
1305 | put_unused_fd(fd2); | |
1306 | goto out; | |
1da177e4 LT |
1307 | } |
1308 | ||
1da177e4 LT |
1309 | /* |
1310 | * Bind a name to a socket. Nothing much to do here since it's | |
1311 | * the protocol's responsibility to handle the local address. | |
1312 | * | |
1313 | * We move the socket address to kernel space before we call | |
1314 | * the protocol layer (having also checked the address is ok). | |
1315 | */ | |
1316 | ||
1317 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) | |
1318 | { | |
1319 | struct socket *sock; | |
1320 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1321 | int err, fput_needed; |
1da177e4 | 1322 | |
89bddce5 | 1323 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1324 | if (sock) { |
89bddce5 SH |
1325 | err = move_addr_to_kernel(umyaddr, addrlen, address); |
1326 | if (err >= 0) { | |
1327 | err = security_socket_bind(sock, | |
1328 | (struct sockaddr *)address, | |
1329 | addrlen); | |
6cb153ca BL |
1330 | if (!err) |
1331 | err = sock->ops->bind(sock, | |
89bddce5 SH |
1332 | (struct sockaddr *) |
1333 | address, addrlen); | |
1da177e4 | 1334 | } |
6cb153ca | 1335 | fput_light(sock->file, fput_needed); |
89bddce5 | 1336 | } |
1da177e4 LT |
1337 | return err; |
1338 | } | |
1339 | ||
1da177e4 LT |
1340 | /* |
1341 | * Perform a listen. Basically, we allow the protocol to do anything | |
1342 | * necessary for a listen, and if that works, we mark the socket as | |
1343 | * ready for listening. | |
1344 | */ | |
1345 | ||
7a42c217 | 1346 | int sysctl_somaxconn __read_mostly = SOMAXCONN; |
1da177e4 LT |
1347 | |
1348 | asmlinkage long sys_listen(int fd, int backlog) | |
1349 | { | |
1350 | struct socket *sock; | |
6cb153ca | 1351 | int err, fput_needed; |
89bddce5 SH |
1352 | |
1353 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1354 | if (sock) { | |
1355 | if ((unsigned)backlog > sysctl_somaxconn) | |
1da177e4 LT |
1356 | backlog = sysctl_somaxconn; |
1357 | ||
1358 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1359 | if (!err) |
1360 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1361 | |
6cb153ca | 1362 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1363 | } |
1364 | return err; | |
1365 | } | |
1366 | ||
1da177e4 LT |
1367 | /* |
1368 | * For accept, we attempt to create a new socket, set up the link | |
1369 | * with the client, wake up the client, then return the new | |
1370 | * connected fd. We collect the address of the connector in kernel | |
1371 | * space and move it to user at the very end. This is unclean because | |
1372 | * we open the socket then return an error. | |
1373 | * | |
1374 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1375 | * status to recvmsg. We need to add that support in a way thats | |
1376 | * clean when we restucture accept also. | |
1377 | */ | |
1378 | ||
89bddce5 SH |
1379 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, |
1380 | int __user *upeer_addrlen) | |
1da177e4 LT |
1381 | { |
1382 | struct socket *sock, *newsock; | |
39d8c1b6 | 1383 | struct file *newfile; |
6cb153ca | 1384 | int err, len, newfd, fput_needed; |
1da177e4 LT |
1385 | char address[MAX_SOCK_ADDR]; |
1386 | ||
6cb153ca | 1387 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1388 | if (!sock) |
1389 | goto out; | |
1390 | ||
1391 | err = -ENFILE; | |
89bddce5 | 1392 | if (!(newsock = sock_alloc())) |
1da177e4 LT |
1393 | goto out_put; |
1394 | ||
1395 | newsock->type = sock->type; | |
1396 | newsock->ops = sock->ops; | |
1397 | ||
1da177e4 LT |
1398 | /* |
1399 | * We don't need try_module_get here, as the listening socket (sock) | |
1400 | * has the protocol module (sock->ops->owner) held. | |
1401 | */ | |
1402 | __module_get(newsock->ops->owner); | |
1403 | ||
39d8c1b6 DM |
1404 | newfd = sock_alloc_fd(&newfile); |
1405 | if (unlikely(newfd < 0)) { | |
1406 | err = newfd; | |
9a1875e6 DM |
1407 | sock_release(newsock); |
1408 | goto out_put; | |
39d8c1b6 DM |
1409 | } |
1410 | ||
1411 | err = sock_attach_fd(newsock, newfile); | |
1412 | if (err < 0) | |
79f4f642 | 1413 | goto out_fd_simple; |
39d8c1b6 | 1414 | |
a79af59e FF |
1415 | err = security_socket_accept(sock, newsock); |
1416 | if (err) | |
39d8c1b6 | 1417 | goto out_fd; |
a79af59e | 1418 | |
1da177e4 LT |
1419 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1420 | if (err < 0) | |
39d8c1b6 | 1421 | goto out_fd; |
1da177e4 LT |
1422 | |
1423 | if (upeer_sockaddr) { | |
89bddce5 SH |
1424 | if (newsock->ops->getname(newsock, (struct sockaddr *)address, |
1425 | &len, 2) < 0) { | |
1da177e4 | 1426 | err = -ECONNABORTED; |
39d8c1b6 | 1427 | goto out_fd; |
1da177e4 | 1428 | } |
89bddce5 SH |
1429 | err = move_addr_to_user(address, len, upeer_sockaddr, |
1430 | upeer_addrlen); | |
1da177e4 | 1431 | if (err < 0) |
39d8c1b6 | 1432 | goto out_fd; |
1da177e4 LT |
1433 | } |
1434 | ||
1435 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1436 | ||
39d8c1b6 DM |
1437 | fd_install(newfd, newfile); |
1438 | err = newfd; | |
1da177e4 LT |
1439 | |
1440 | security_socket_post_accept(sock, newsock); | |
1441 | ||
1442 | out_put: | |
6cb153ca | 1443 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1444 | out: |
1445 | return err; | |
79f4f642 AD |
1446 | out_fd_simple: |
1447 | sock_release(newsock); | |
1448 | put_filp(newfile); | |
1449 | put_unused_fd(newfd); | |
1450 | goto out_put; | |
39d8c1b6 | 1451 | out_fd: |
9606a216 | 1452 | fput(newfile); |
39d8c1b6 | 1453 | put_unused_fd(newfd); |
1da177e4 LT |
1454 | goto out_put; |
1455 | } | |
1456 | ||
1da177e4 LT |
1457 | /* |
1458 | * Attempt to connect to a socket with the server address. The address | |
1459 | * is in user space so we verify it is OK and move it to kernel space. | |
1460 | * | |
1461 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1462 | * break bindings | |
1463 | * | |
1464 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1465 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1466 | * include the -EINPROGRESS status for such sockets. | |
1467 | */ | |
1468 | ||
89bddce5 SH |
1469 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, |
1470 | int addrlen) | |
1da177e4 LT |
1471 | { |
1472 | struct socket *sock; | |
1473 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1474 | int err, fput_needed; |
1da177e4 | 1475 | |
6cb153ca | 1476 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1477 | if (!sock) |
1478 | goto out; | |
1479 | err = move_addr_to_kernel(uservaddr, addrlen, address); | |
1480 | if (err < 0) | |
1481 | goto out_put; | |
1482 | ||
89bddce5 SH |
1483 | err = |
1484 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); | |
1da177e4 LT |
1485 | if (err) |
1486 | goto out_put; | |
1487 | ||
89bddce5 | 1488 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
1da177e4 LT |
1489 | sock->file->f_flags); |
1490 | out_put: | |
6cb153ca | 1491 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1492 | out: |
1493 | return err; | |
1494 | } | |
1495 | ||
1496 | /* | |
1497 | * Get the local address ('name') of a socket object. Move the obtained | |
1498 | * name to user space. | |
1499 | */ | |
1500 | ||
89bddce5 SH |
1501 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1502 | int __user *usockaddr_len) | |
1da177e4 LT |
1503 | { |
1504 | struct socket *sock; | |
1505 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1506 | int len, err, fput_needed; |
89bddce5 | 1507 | |
6cb153ca | 1508 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1509 | if (!sock) |
1510 | goto out; | |
1511 | ||
1512 | err = security_socket_getsockname(sock); | |
1513 | if (err) | |
1514 | goto out_put; | |
1515 | ||
1516 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); | |
1517 | if (err) | |
1518 | goto out_put; | |
1519 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); | |
1520 | ||
1521 | out_put: | |
6cb153ca | 1522 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1523 | out: |
1524 | return err; | |
1525 | } | |
1526 | ||
1527 | /* | |
1528 | * Get the remote address ('name') of a socket object. Move the obtained | |
1529 | * name to user space. | |
1530 | */ | |
1531 | ||
89bddce5 SH |
1532 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1533 | int __user *usockaddr_len) | |
1da177e4 LT |
1534 | { |
1535 | struct socket *sock; | |
1536 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1537 | int len, err, fput_needed; |
1da177e4 | 1538 | |
89bddce5 SH |
1539 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1540 | if (sock != NULL) { | |
1da177e4 LT |
1541 | err = security_socket_getpeername(sock); |
1542 | if (err) { | |
6cb153ca | 1543 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1544 | return err; |
1545 | } | |
1546 | ||
89bddce5 SH |
1547 | err = |
1548 | sock->ops->getname(sock, (struct sockaddr *)address, &len, | |
1549 | 1); | |
1da177e4 | 1550 | if (!err) |
89bddce5 SH |
1551 | err = move_addr_to_user(address, len, usockaddr, |
1552 | usockaddr_len); | |
6cb153ca | 1553 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1554 | } |
1555 | return err; | |
1556 | } | |
1557 | ||
1558 | /* | |
1559 | * Send a datagram to a given address. We move the address into kernel | |
1560 | * space and check the user space data area is readable before invoking | |
1561 | * the protocol. | |
1562 | */ | |
1563 | ||
89bddce5 SH |
1564 | asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, |
1565 | unsigned flags, struct sockaddr __user *addr, | |
1566 | int addr_len) | |
1da177e4 LT |
1567 | { |
1568 | struct socket *sock; | |
1569 | char address[MAX_SOCK_ADDR]; | |
1570 | int err; | |
1571 | struct msghdr msg; | |
1572 | struct iovec iov; | |
6cb153ca BL |
1573 | int fput_needed; |
1574 | struct file *sock_file; | |
1575 | ||
1576 | sock_file = fget_light(fd, &fput_needed); | |
4387ff75 | 1577 | err = -EBADF; |
6cb153ca | 1578 | if (!sock_file) |
4387ff75 | 1579 | goto out; |
6cb153ca BL |
1580 | |
1581 | sock = sock_from_file(sock_file, &err); | |
1da177e4 | 1582 | if (!sock) |
6cb153ca | 1583 | goto out_put; |
89bddce5 SH |
1584 | iov.iov_base = buff; |
1585 | iov.iov_len = len; | |
1586 | msg.msg_name = NULL; | |
1587 | msg.msg_iov = &iov; | |
1588 | msg.msg_iovlen = 1; | |
1589 | msg.msg_control = NULL; | |
1590 | msg.msg_controllen = 0; | |
1591 | msg.msg_namelen = 0; | |
6cb153ca | 1592 | if (addr) { |
1da177e4 LT |
1593 | err = move_addr_to_kernel(addr, addr_len, address); |
1594 | if (err < 0) | |
1595 | goto out_put; | |
89bddce5 SH |
1596 | msg.msg_name = address; |
1597 | msg.msg_namelen = addr_len; | |
1da177e4 LT |
1598 | } |
1599 | if (sock->file->f_flags & O_NONBLOCK) | |
1600 | flags |= MSG_DONTWAIT; | |
1601 | msg.msg_flags = flags; | |
1602 | err = sock_sendmsg(sock, &msg, len); | |
1603 | ||
89bddce5 | 1604 | out_put: |
6cb153ca | 1605 | fput_light(sock_file, fput_needed); |
4387ff75 | 1606 | out: |
1da177e4 LT |
1607 | return err; |
1608 | } | |
1609 | ||
1610 | /* | |
89bddce5 | 1611 | * Send a datagram down a socket. |
1da177e4 LT |
1612 | */ |
1613 | ||
89bddce5 | 1614 | asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) |
1da177e4 LT |
1615 | { |
1616 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1617 | } | |
1618 | ||
1619 | /* | |
89bddce5 | 1620 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
1621 | * sender. We verify the buffers are writable and if needed move the |
1622 | * sender address from kernel to user space. | |
1623 | */ | |
1624 | ||
89bddce5 SH |
1625 | asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, |
1626 | unsigned flags, struct sockaddr __user *addr, | |
1627 | int __user *addr_len) | |
1da177e4 LT |
1628 | { |
1629 | struct socket *sock; | |
1630 | struct iovec iov; | |
1631 | struct msghdr msg; | |
1632 | char address[MAX_SOCK_ADDR]; | |
89bddce5 | 1633 | int err, err2; |
6cb153ca BL |
1634 | struct file *sock_file; |
1635 | int fput_needed; | |
1636 | ||
1637 | sock_file = fget_light(fd, &fput_needed); | |
4387ff75 | 1638 | err = -EBADF; |
6cb153ca | 1639 | if (!sock_file) |
4387ff75 | 1640 | goto out; |
1da177e4 | 1641 | |
6cb153ca | 1642 | sock = sock_from_file(sock_file, &err); |
1da177e4 | 1643 | if (!sock) |
4387ff75 | 1644 | goto out_put; |
1da177e4 | 1645 | |
89bddce5 SH |
1646 | msg.msg_control = NULL; |
1647 | msg.msg_controllen = 0; | |
1648 | msg.msg_iovlen = 1; | |
1649 | msg.msg_iov = &iov; | |
1650 | iov.iov_len = size; | |
1651 | iov.iov_base = ubuf; | |
1652 | msg.msg_name = address; | |
1653 | msg.msg_namelen = MAX_SOCK_ADDR; | |
1da177e4 LT |
1654 | if (sock->file->f_flags & O_NONBLOCK) |
1655 | flags |= MSG_DONTWAIT; | |
89bddce5 | 1656 | err = sock_recvmsg(sock, &msg, size, flags); |
1da177e4 | 1657 | |
89bddce5 SH |
1658 | if (err >= 0 && addr != NULL) { |
1659 | err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); | |
1660 | if (err2 < 0) | |
1661 | err = err2; | |
1da177e4 | 1662 | } |
4387ff75 | 1663 | out_put: |
6cb153ca | 1664 | fput_light(sock_file, fput_needed); |
4387ff75 | 1665 | out: |
1da177e4 LT |
1666 | return err; |
1667 | } | |
1668 | ||
1669 | /* | |
89bddce5 | 1670 | * Receive a datagram from a socket. |
1da177e4 LT |
1671 | */ |
1672 | ||
89bddce5 SH |
1673 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
1674 | unsigned flags) | |
1da177e4 LT |
1675 | { |
1676 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1677 | } | |
1678 | ||
1679 | /* | |
1680 | * Set a socket option. Because we don't know the option lengths we have | |
1681 | * to pass the user mode parameter for the protocols to sort out. | |
1682 | */ | |
1683 | ||
89bddce5 SH |
1684 | asmlinkage long sys_setsockopt(int fd, int level, int optname, |
1685 | char __user *optval, int optlen) | |
1da177e4 | 1686 | { |
6cb153ca | 1687 | int err, fput_needed; |
1da177e4 LT |
1688 | struct socket *sock; |
1689 | ||
1690 | if (optlen < 0) | |
1691 | return -EINVAL; | |
89bddce5 SH |
1692 | |
1693 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1694 | if (sock != NULL) { | |
1695 | err = security_socket_setsockopt(sock, level, optname); | |
6cb153ca BL |
1696 | if (err) |
1697 | goto out_put; | |
1da177e4 LT |
1698 | |
1699 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1700 | err = |
1701 | sock_setsockopt(sock, level, optname, optval, | |
1702 | optlen); | |
1da177e4 | 1703 | else |
89bddce5 SH |
1704 | err = |
1705 | sock->ops->setsockopt(sock, level, optname, optval, | |
1706 | optlen); | |
6cb153ca BL |
1707 | out_put: |
1708 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1709 | } |
1710 | return err; | |
1711 | } | |
1712 | ||
1713 | /* | |
1714 | * Get a socket option. Because we don't know the option lengths we have | |
1715 | * to pass a user mode parameter for the protocols to sort out. | |
1716 | */ | |
1717 | ||
89bddce5 SH |
1718 | asmlinkage long sys_getsockopt(int fd, int level, int optname, |
1719 | char __user *optval, int __user *optlen) | |
1da177e4 | 1720 | { |
6cb153ca | 1721 | int err, fput_needed; |
1da177e4 LT |
1722 | struct socket *sock; |
1723 | ||
89bddce5 SH |
1724 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1725 | if (sock != NULL) { | |
6cb153ca BL |
1726 | err = security_socket_getsockopt(sock, level, optname); |
1727 | if (err) | |
1728 | goto out_put; | |
1da177e4 LT |
1729 | |
1730 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1731 | err = |
1732 | sock_getsockopt(sock, level, optname, optval, | |
1733 | optlen); | |
1da177e4 | 1734 | else |
89bddce5 SH |
1735 | err = |
1736 | sock->ops->getsockopt(sock, level, optname, optval, | |
1737 | optlen); | |
6cb153ca BL |
1738 | out_put: |
1739 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1740 | } |
1741 | return err; | |
1742 | } | |
1743 | ||
1da177e4 LT |
1744 | /* |
1745 | * Shutdown a socket. | |
1746 | */ | |
1747 | ||
1748 | asmlinkage long sys_shutdown(int fd, int how) | |
1749 | { | |
6cb153ca | 1750 | int err, fput_needed; |
1da177e4 LT |
1751 | struct socket *sock; |
1752 | ||
89bddce5 SH |
1753 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1754 | if (sock != NULL) { | |
1da177e4 | 1755 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
1756 | if (!err) |
1757 | err = sock->ops->shutdown(sock, how); | |
1758 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1759 | } |
1760 | return err; | |
1761 | } | |
1762 | ||
89bddce5 | 1763 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
1764 | * fields which are the same type (int / unsigned) on our platforms. |
1765 | */ | |
1766 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1767 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1768 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1769 | ||
1da177e4 LT |
1770 | /* |
1771 | * BSD sendmsg interface | |
1772 | */ | |
1773 | ||
1774 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
1775 | { | |
89bddce5 SH |
1776 | struct compat_msghdr __user *msg_compat = |
1777 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1778 | struct socket *sock; |
1779 | char address[MAX_SOCK_ADDR]; | |
1780 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
b9d717a7 | 1781 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
89bddce5 SH |
1782 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
1783 | /* 20 is size of ipv6_pktinfo */ | |
1da177e4 LT |
1784 | unsigned char *ctl_buf = ctl; |
1785 | struct msghdr msg_sys; | |
1786 | int err, ctl_len, iov_size, total_len; | |
6cb153ca | 1787 | int fput_needed; |
89bddce5 | 1788 | |
1da177e4 LT |
1789 | err = -EFAULT; |
1790 | if (MSG_CMSG_COMPAT & flags) { | |
1791 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1792 | return -EFAULT; | |
89bddce5 SH |
1793 | } |
1794 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1da177e4 LT |
1795 | return -EFAULT; |
1796 | ||
6cb153ca | 1797 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
89bddce5 | 1798 | if (!sock) |
1da177e4 LT |
1799 | goto out; |
1800 | ||
1801 | /* do not move before msg_sys is valid */ | |
1802 | err = -EMSGSIZE; | |
1803 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1804 | goto out_put; | |
1805 | ||
89bddce5 | 1806 | /* Check whether to allocate the iovec area */ |
1da177e4 LT |
1807 | err = -ENOMEM; |
1808 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1809 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1810 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1811 | if (!iov) | |
1812 | goto out_put; | |
1813 | } | |
1814 | ||
1815 | /* This will also move the address data into kernel space */ | |
1816 | if (MSG_CMSG_COMPAT & flags) { | |
1817 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); | |
1818 | } else | |
1819 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); | |
89bddce5 | 1820 | if (err < 0) |
1da177e4 LT |
1821 | goto out_freeiov; |
1822 | total_len = err; | |
1823 | ||
1824 | err = -ENOBUFS; | |
1825 | ||
1826 | if (msg_sys.msg_controllen > INT_MAX) | |
1827 | goto out_freeiov; | |
89bddce5 | 1828 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1829 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 SH |
1830 | err = |
1831 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, | |
1832 | sizeof(ctl)); | |
1da177e4 LT |
1833 | if (err) |
1834 | goto out_freeiov; | |
1835 | ctl_buf = msg_sys.msg_control; | |
8920e8f9 | 1836 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1837 | } else if (ctl_len) { |
89bddce5 | 1838 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 1839 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 1840 | if (ctl_buf == NULL) |
1da177e4 LT |
1841 | goto out_freeiov; |
1842 | } | |
1843 | err = -EFAULT; | |
1844 | /* | |
1845 | * Careful! Before this, msg_sys.msg_control contains a user pointer. | |
1846 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1847 | * checking falls down on this. | |
1848 | */ | |
89bddce5 SH |
1849 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, |
1850 | ctl_len)) | |
1da177e4 LT |
1851 | goto out_freectl; |
1852 | msg_sys.msg_control = ctl_buf; | |
1853 | } | |
1854 | msg_sys.msg_flags = flags; | |
1855 | ||
1856 | if (sock->file->f_flags & O_NONBLOCK) | |
1857 | msg_sys.msg_flags |= MSG_DONTWAIT; | |
1858 | err = sock_sendmsg(sock, &msg_sys, total_len); | |
1859 | ||
1860 | out_freectl: | |
89bddce5 | 1861 | if (ctl_buf != ctl) |
1da177e4 LT |
1862 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
1863 | out_freeiov: | |
1864 | if (iov != iovstack) | |
1865 | sock_kfree_s(sock->sk, iov, iov_size); | |
1866 | out_put: | |
6cb153ca | 1867 | fput_light(sock->file, fput_needed); |
89bddce5 | 1868 | out: |
1da177e4 LT |
1869 | return err; |
1870 | } | |
1871 | ||
1872 | /* | |
1873 | * BSD recvmsg interface | |
1874 | */ | |
1875 | ||
89bddce5 SH |
1876 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, |
1877 | unsigned int flags) | |
1da177e4 | 1878 | { |
89bddce5 SH |
1879 | struct compat_msghdr __user *msg_compat = |
1880 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1881 | struct socket *sock; |
1882 | struct iovec iovstack[UIO_FASTIOV]; | |
89bddce5 | 1883 | struct iovec *iov = iovstack; |
1da177e4 LT |
1884 | struct msghdr msg_sys; |
1885 | unsigned long cmsg_ptr; | |
1886 | int err, iov_size, total_len, len; | |
6cb153ca | 1887 | int fput_needed; |
1da177e4 LT |
1888 | |
1889 | /* kernel mode address */ | |
1890 | char addr[MAX_SOCK_ADDR]; | |
1891 | ||
1892 | /* user mode address pointers */ | |
1893 | struct sockaddr __user *uaddr; | |
1894 | int __user *uaddr_len; | |
89bddce5 | 1895 | |
1da177e4 LT |
1896 | if (MSG_CMSG_COMPAT & flags) { |
1897 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1898 | return -EFAULT; | |
89bddce5 SH |
1899 | } |
1900 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1901 | return -EFAULT; | |
1da177e4 | 1902 | |
6cb153ca | 1903 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1904 | if (!sock) |
1905 | goto out; | |
1906 | ||
1907 | err = -EMSGSIZE; | |
1908 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1909 | goto out_put; | |
89bddce5 SH |
1910 | |
1911 | /* Check whether to allocate the iovec area */ | |
1da177e4 LT |
1912 | err = -ENOMEM; |
1913 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1914 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1915 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1916 | if (!iov) | |
1917 | goto out_put; | |
1918 | } | |
1919 | ||
1920 | /* | |
89bddce5 SH |
1921 | * Save the user-mode address (verify_iovec will change the |
1922 | * kernel msghdr to use the kernel address space) | |
1da177e4 | 1923 | */ |
89bddce5 SH |
1924 | |
1925 | uaddr = (void __user *)msg_sys.msg_name; | |
1da177e4 LT |
1926 | uaddr_len = COMPAT_NAMELEN(msg); |
1927 | if (MSG_CMSG_COMPAT & flags) { | |
1928 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1929 | } else | |
1930 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1931 | if (err < 0) | |
1932 | goto out_freeiov; | |
89bddce5 | 1933 | total_len = err; |
1da177e4 LT |
1934 | |
1935 | cmsg_ptr = (unsigned long)msg_sys.msg_control; | |
1936 | msg_sys.msg_flags = 0; | |
1937 | if (MSG_CMSG_COMPAT & flags) | |
1938 | msg_sys.msg_flags = MSG_CMSG_COMPAT; | |
89bddce5 | 1939 | |
1da177e4 LT |
1940 | if (sock->file->f_flags & O_NONBLOCK) |
1941 | flags |= MSG_DONTWAIT; | |
1942 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); | |
1943 | if (err < 0) | |
1944 | goto out_freeiov; | |
1945 | len = err; | |
1946 | ||
1947 | if (uaddr != NULL) { | |
89bddce5 SH |
1948 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, |
1949 | uaddr_len); | |
1da177e4 LT |
1950 | if (err < 0) |
1951 | goto out_freeiov; | |
1952 | } | |
37f7f421 DM |
1953 | err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), |
1954 | COMPAT_FLAGS(msg)); | |
1da177e4 LT |
1955 | if (err) |
1956 | goto out_freeiov; | |
1957 | if (MSG_CMSG_COMPAT & flags) | |
89bddce5 | 1958 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1959 | &msg_compat->msg_controllen); |
1960 | else | |
89bddce5 | 1961 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1962 | &msg->msg_controllen); |
1963 | if (err) | |
1964 | goto out_freeiov; | |
1965 | err = len; | |
1966 | ||
1967 | out_freeiov: | |
1968 | if (iov != iovstack) | |
1969 | sock_kfree_s(sock->sk, iov, iov_size); | |
1970 | out_put: | |
6cb153ca | 1971 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1972 | out: |
1973 | return err; | |
1974 | } | |
1975 | ||
1976 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
1977 | ||
1978 | /* Argument list sizes for sys_socketcall */ | |
1979 | #define AL(x) ((x) * sizeof(unsigned long)) | |
89bddce5 SH |
1980 | static const unsigned char nargs[18]={ |
1981 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), | |
1982 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), | |
1983 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) | |
1984 | }; | |
1985 | ||
1da177e4 LT |
1986 | #undef AL |
1987 | ||
1988 | /* | |
89bddce5 | 1989 | * System call vectors. |
1da177e4 LT |
1990 | * |
1991 | * Argument checking cleaned up. Saved 20% in size. | |
1992 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 1993 | * it is set by the callees. |
1da177e4 LT |
1994 | */ |
1995 | ||
1996 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) | |
1997 | { | |
1998 | unsigned long a[6]; | |
89bddce5 | 1999 | unsigned long a0, a1; |
1da177e4 LT |
2000 | int err; |
2001 | ||
89bddce5 | 2002 | if (call < 1 || call > SYS_RECVMSG) |
1da177e4 LT |
2003 | return -EINVAL; |
2004 | ||
2005 | /* copy_from_user should be SMP safe. */ | |
2006 | if (copy_from_user(a, args, nargs[call])) | |
2007 | return -EFAULT; | |
3ec3b2fb | 2008 | |
89bddce5 | 2009 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
3ec3b2fb DW |
2010 | if (err) |
2011 | return err; | |
2012 | ||
89bddce5 SH |
2013 | a0 = a[0]; |
2014 | a1 = a[1]; | |
2015 | ||
2016 | switch (call) { | |
2017 | case SYS_SOCKET: | |
2018 | err = sys_socket(a0, a1, a[2]); | |
2019 | break; | |
2020 | case SYS_BIND: | |
2021 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2022 | break; | |
2023 | case SYS_CONNECT: | |
2024 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2025 | break; | |
2026 | case SYS_LISTEN: | |
2027 | err = sys_listen(a0, a1); | |
2028 | break; | |
2029 | case SYS_ACCEPT: | |
2030 | err = | |
2031 | sys_accept(a0, (struct sockaddr __user *)a1, | |
2032 | (int __user *)a[2]); | |
2033 | break; | |
2034 | case SYS_GETSOCKNAME: | |
2035 | err = | |
2036 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2037 | (int __user *)a[2]); | |
2038 | break; | |
2039 | case SYS_GETPEERNAME: | |
2040 | err = | |
2041 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2042 | (int __user *)a[2]); | |
2043 | break; | |
2044 | case SYS_SOCKETPAIR: | |
2045 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2046 | break; | |
2047 | case SYS_SEND: | |
2048 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2049 | break; | |
2050 | case SYS_SENDTO: | |
2051 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2052 | (struct sockaddr __user *)a[4], a[5]); | |
2053 | break; | |
2054 | case SYS_RECV: | |
2055 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2056 | break; | |
2057 | case SYS_RECVFROM: | |
2058 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2059 | (struct sockaddr __user *)a[4], | |
2060 | (int __user *)a[5]); | |
2061 | break; | |
2062 | case SYS_SHUTDOWN: | |
2063 | err = sys_shutdown(a0, a1); | |
2064 | break; | |
2065 | case SYS_SETSOCKOPT: | |
2066 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2067 | break; | |
2068 | case SYS_GETSOCKOPT: | |
2069 | err = | |
2070 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2071 | (int __user *)a[4]); | |
2072 | break; | |
2073 | case SYS_SENDMSG: | |
2074 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2075 | break; | |
2076 | case SYS_RECVMSG: | |
2077 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2078 | break; | |
2079 | default: | |
2080 | err = -EINVAL; | |
2081 | break; | |
1da177e4 LT |
2082 | } |
2083 | return err; | |
2084 | } | |
2085 | ||
89bddce5 | 2086 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2087 | |
55737fda SH |
2088 | /** |
2089 | * sock_register - add a socket protocol handler | |
2090 | * @ops: description of protocol | |
2091 | * | |
1da177e4 LT |
2092 | * This function is called by a protocol handler that wants to |
2093 | * advertise its address family, and have it linked into the | |
55737fda SH |
2094 | * socket interface. The value ops->family coresponds to the |
2095 | * socket system call protocol family. | |
1da177e4 | 2096 | */ |
f0fd27d4 | 2097 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2098 | { |
2099 | int err; | |
2100 | ||
2101 | if (ops->family >= NPROTO) { | |
89bddce5 SH |
2102 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
2103 | NPROTO); | |
1da177e4 LT |
2104 | return -ENOBUFS; |
2105 | } | |
55737fda SH |
2106 | |
2107 | spin_lock(&net_family_lock); | |
2108 | if (net_families[ops->family]) | |
2109 | err = -EEXIST; | |
2110 | else { | |
89bddce5 | 2111 | net_families[ops->family] = ops; |
1da177e4 LT |
2112 | err = 0; |
2113 | } | |
55737fda SH |
2114 | spin_unlock(&net_family_lock); |
2115 | ||
89bddce5 | 2116 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
2117 | return err; |
2118 | } | |
2119 | ||
55737fda SH |
2120 | /** |
2121 | * sock_unregister - remove a protocol handler | |
2122 | * @family: protocol family to remove | |
2123 | * | |
1da177e4 LT |
2124 | * This function is called by a protocol handler that wants to |
2125 | * remove its address family, and have it unlinked from the | |
55737fda SH |
2126 | * new socket creation. |
2127 | * | |
2128 | * If protocol handler is a module, then it can use module reference | |
2129 | * counts to protect against new references. If protocol handler is not | |
2130 | * a module then it needs to provide its own protection in | |
2131 | * the ops->create routine. | |
1da177e4 | 2132 | */ |
f0fd27d4 | 2133 | void sock_unregister(int family) |
1da177e4 | 2134 | { |
f0fd27d4 | 2135 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 2136 | |
55737fda | 2137 | spin_lock(&net_family_lock); |
89bddce5 | 2138 | net_families[family] = NULL; |
55737fda SH |
2139 | spin_unlock(&net_family_lock); |
2140 | ||
2141 | synchronize_rcu(); | |
2142 | ||
89bddce5 | 2143 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
1da177e4 LT |
2144 | } |
2145 | ||
77d76ea3 | 2146 | static int __init sock_init(void) |
1da177e4 LT |
2147 | { |
2148 | /* | |
89bddce5 | 2149 | * Initialize sock SLAB cache. |
1da177e4 | 2150 | */ |
89bddce5 | 2151 | |
1da177e4 LT |
2152 | sk_init(); |
2153 | ||
1da177e4 | 2154 | /* |
89bddce5 | 2155 | * Initialize skbuff SLAB cache |
1da177e4 LT |
2156 | */ |
2157 | skb_init(); | |
1da177e4 LT |
2158 | |
2159 | /* | |
89bddce5 | 2160 | * Initialize the protocols module. |
1da177e4 LT |
2161 | */ |
2162 | ||
2163 | init_inodecache(); | |
2164 | register_filesystem(&sock_fs_type); | |
2165 | sock_mnt = kern_mount(&sock_fs_type); | |
77d76ea3 AK |
2166 | |
2167 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
2168 | */ |
2169 | ||
2170 | #ifdef CONFIG_NETFILTER | |
2171 | netfilter_init(); | |
2172 | #endif | |
cbeb321a DM |
2173 | |
2174 | return 0; | |
1da177e4 LT |
2175 | } |
2176 | ||
77d76ea3 AK |
2177 | core_initcall(sock_init); /* early initcall */ |
2178 | ||
1da177e4 LT |
2179 | #ifdef CONFIG_PROC_FS |
2180 | void socket_seq_show(struct seq_file *seq) | |
2181 | { | |
2182 | int cpu; | |
2183 | int counter = 0; | |
2184 | ||
6f912042 | 2185 | for_each_possible_cpu(cpu) |
89bddce5 | 2186 | counter += per_cpu(sockets_in_use, cpu); |
1da177e4 LT |
2187 | |
2188 | /* It can be negative, by the way. 8) */ | |
2189 | if (counter < 0) | |
2190 | counter = 0; | |
2191 | ||
2192 | seq_printf(seq, "sockets: used %d\n", counter); | |
2193 | } | |
89bddce5 | 2194 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 2195 | |
89bbfc95 SP |
2196 | #ifdef CONFIG_COMPAT |
2197 | static long compat_sock_ioctl(struct file *file, unsigned cmd, | |
89bddce5 | 2198 | unsigned long arg) |
89bbfc95 SP |
2199 | { |
2200 | struct socket *sock = file->private_data; | |
2201 | int ret = -ENOIOCTLCMD; | |
2202 | ||
2203 | if (sock->ops->compat_ioctl) | |
2204 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
2205 | ||
2206 | return ret; | |
2207 | } | |
2208 | #endif | |
2209 | ||
ac5a488e SS |
2210 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
2211 | { | |
2212 | return sock->ops->bind(sock, addr, addrlen); | |
2213 | } | |
2214 | ||
2215 | int kernel_listen(struct socket *sock, int backlog) | |
2216 | { | |
2217 | return sock->ops->listen(sock, backlog); | |
2218 | } | |
2219 | ||
2220 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
2221 | { | |
2222 | struct sock *sk = sock->sk; | |
2223 | int err; | |
2224 | ||
2225 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
2226 | newsock); | |
2227 | if (err < 0) | |
2228 | goto done; | |
2229 | ||
2230 | err = sock->ops->accept(sock, *newsock, flags); | |
2231 | if (err < 0) { | |
2232 | sock_release(*newsock); | |
2233 | goto done; | |
2234 | } | |
2235 | ||
2236 | (*newsock)->ops = sock->ops; | |
2237 | ||
2238 | done: | |
2239 | return err; | |
2240 | } | |
2241 | ||
2242 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
4768fbcb | 2243 | int flags) |
ac5a488e SS |
2244 | { |
2245 | return sock->ops->connect(sock, addr, addrlen, flags); | |
2246 | } | |
2247 | ||
2248 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
2249 | int *addrlen) | |
2250 | { | |
2251 | return sock->ops->getname(sock, addr, addrlen, 0); | |
2252 | } | |
2253 | ||
2254 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
2255 | int *addrlen) | |
2256 | { | |
2257 | return sock->ops->getname(sock, addr, addrlen, 1); | |
2258 | } | |
2259 | ||
2260 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
2261 | char *optval, int *optlen) | |
2262 | { | |
2263 | mm_segment_t oldfs = get_fs(); | |
2264 | int err; | |
2265 | ||
2266 | set_fs(KERNEL_DS); | |
2267 | if (level == SOL_SOCKET) | |
2268 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
2269 | else | |
2270 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
2271 | optlen); | |
2272 | set_fs(oldfs); | |
2273 | return err; | |
2274 | } | |
2275 | ||
2276 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
2277 | char *optval, int optlen) | |
2278 | { | |
2279 | mm_segment_t oldfs = get_fs(); | |
2280 | int err; | |
2281 | ||
2282 | set_fs(KERNEL_DS); | |
2283 | if (level == SOL_SOCKET) | |
2284 | err = sock_setsockopt(sock, level, optname, optval, optlen); | |
2285 | else | |
2286 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
2287 | optlen); | |
2288 | set_fs(oldfs); | |
2289 | return err; | |
2290 | } | |
2291 | ||
2292 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
2293 | size_t size, int flags) | |
2294 | { | |
2295 | if (sock->ops->sendpage) | |
2296 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
2297 | ||
2298 | return sock_no_sendpage(sock, page, offset, size, flags); | |
2299 | } | |
2300 | ||
2301 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
2302 | { | |
2303 | mm_segment_t oldfs = get_fs(); | |
2304 | int err; | |
2305 | ||
2306 | set_fs(KERNEL_DS); | |
2307 | err = sock->ops->ioctl(sock, cmd, arg); | |
2308 | set_fs(oldfs); | |
2309 | ||
2310 | return err; | |
2311 | } | |
2312 | ||
1da177e4 LT |
2313 | /* ABI emulation layers need these two */ |
2314 | EXPORT_SYMBOL(move_addr_to_kernel); | |
2315 | EXPORT_SYMBOL(move_addr_to_user); | |
2316 | EXPORT_SYMBOL(sock_create); | |
2317 | EXPORT_SYMBOL(sock_create_kern); | |
2318 | EXPORT_SYMBOL(sock_create_lite); | |
2319 | EXPORT_SYMBOL(sock_map_fd); | |
2320 | EXPORT_SYMBOL(sock_recvmsg); | |
2321 | EXPORT_SYMBOL(sock_register); | |
2322 | EXPORT_SYMBOL(sock_release); | |
2323 | EXPORT_SYMBOL(sock_sendmsg); | |
2324 | EXPORT_SYMBOL(sock_unregister); | |
2325 | EXPORT_SYMBOL(sock_wake_async); | |
2326 | EXPORT_SYMBOL(sockfd_lookup); | |
2327 | EXPORT_SYMBOL(kernel_sendmsg); | |
2328 | EXPORT_SYMBOL(kernel_recvmsg); | |
ac5a488e SS |
2329 | EXPORT_SYMBOL(kernel_bind); |
2330 | EXPORT_SYMBOL(kernel_listen); | |
2331 | EXPORT_SYMBOL(kernel_accept); | |
2332 | EXPORT_SYMBOL(kernel_connect); | |
2333 | EXPORT_SYMBOL(kernel_getsockname); | |
2334 | EXPORT_SYMBOL(kernel_getpeername); | |
2335 | EXPORT_SYMBOL(kernel_getsockopt); | |
2336 | EXPORT_SYMBOL(kernel_setsockopt); | |
2337 | EXPORT_SYMBOL(kernel_sendpage); | |
2338 | EXPORT_SYMBOL(kernel_sock_ioctl); |