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 | ||
120 | static struct file_operations socket_file_ops = { | |
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 | { | |
410 | struct inode *inode; | |
411 | struct socket *sock; | |
412 | ||
413 | if (file->f_op == &socket_file_ops) | |
414 | return file->private_data; /* set in sock_map_fd */ | |
415 | ||
3126a42c | 416 | inode = file->f_path.dentry->d_inode; |
6cb153ca BL |
417 | if (!S_ISSOCK(inode->i_mode)) { |
418 | *err = -ENOTSOCK; | |
419 | return NULL; | |
420 | } | |
421 | ||
422 | sock = SOCKET_I(inode); | |
423 | if (sock->file != file) { | |
424 | printk(KERN_ERR "socki_lookup: socket file changed!\n"); | |
425 | sock->file = file; | |
426 | } | |
427 | return sock; | |
428 | } | |
429 | ||
1da177e4 LT |
430 | /** |
431 | * sockfd_lookup - Go from a file number to its socket slot | |
432 | * @fd: file handle | |
433 | * @err: pointer to an error code return | |
434 | * | |
435 | * The file handle passed in is locked and the socket it is bound | |
436 | * too is returned. If an error occurs the err pointer is overwritten | |
437 | * with a negative errno code and NULL is returned. The function checks | |
438 | * for both invalid handles and passing a handle which is not a socket. | |
439 | * | |
440 | * On a success the socket object pointer is returned. | |
441 | */ | |
442 | ||
443 | struct socket *sockfd_lookup(int fd, int *err) | |
444 | { | |
445 | struct file *file; | |
1da177e4 LT |
446 | struct socket *sock; |
447 | ||
89bddce5 SH |
448 | file = fget(fd); |
449 | if (!file) { | |
1da177e4 LT |
450 | *err = -EBADF; |
451 | return NULL; | |
452 | } | |
89bddce5 | 453 | |
6cb153ca BL |
454 | sock = sock_from_file(file, err); |
455 | if (!sock) | |
1da177e4 | 456 | fput(file); |
6cb153ca BL |
457 | return sock; |
458 | } | |
1da177e4 | 459 | |
6cb153ca BL |
460 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
461 | { | |
462 | struct file *file; | |
463 | struct socket *sock; | |
464 | ||
3672558c | 465 | *err = -EBADF; |
6cb153ca BL |
466 | file = fget_light(fd, fput_needed); |
467 | if (file) { | |
468 | sock = sock_from_file(file, err); | |
469 | if (sock) | |
470 | return sock; | |
471 | fput_light(file, *fput_needed); | |
1da177e4 | 472 | } |
6cb153ca | 473 | return NULL; |
1da177e4 LT |
474 | } |
475 | ||
476 | /** | |
477 | * sock_alloc - allocate a socket | |
89bddce5 | 478 | * |
1da177e4 LT |
479 | * Allocate a new inode and socket object. The two are bound together |
480 | * and initialised. The socket is then returned. If we are out of inodes | |
481 | * NULL is returned. | |
482 | */ | |
483 | ||
484 | static struct socket *sock_alloc(void) | |
485 | { | |
89bddce5 SH |
486 | struct inode *inode; |
487 | struct socket *sock; | |
1da177e4 LT |
488 | |
489 | inode = new_inode(sock_mnt->mnt_sb); | |
490 | if (!inode) | |
491 | return NULL; | |
492 | ||
493 | sock = SOCKET_I(inode); | |
494 | ||
89bddce5 | 495 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
1da177e4 LT |
496 | inode->i_uid = current->fsuid; |
497 | inode->i_gid = current->fsgid; | |
498 | ||
499 | get_cpu_var(sockets_in_use)++; | |
500 | put_cpu_var(sockets_in_use); | |
501 | return sock; | |
502 | } | |
503 | ||
504 | /* | |
505 | * In theory you can't get an open on this inode, but /proc provides | |
506 | * a back door. Remember to keep it shut otherwise you'll let the | |
507 | * creepy crawlies in. | |
508 | */ | |
89bddce5 | 509 | |
1da177e4 LT |
510 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
511 | { | |
512 | return -ENXIO; | |
513 | } | |
514 | ||
4b6f5d20 | 515 | const struct file_operations bad_sock_fops = { |
1da177e4 LT |
516 | .owner = THIS_MODULE, |
517 | .open = sock_no_open, | |
518 | }; | |
519 | ||
520 | /** | |
521 | * sock_release - close a socket | |
522 | * @sock: socket to close | |
523 | * | |
524 | * The socket is released from the protocol stack if it has a release | |
525 | * callback, and the inode is then released if the socket is bound to | |
89bddce5 | 526 | * an inode not a file. |
1da177e4 | 527 | */ |
89bddce5 | 528 | |
1da177e4 LT |
529 | void sock_release(struct socket *sock) |
530 | { | |
531 | if (sock->ops) { | |
532 | struct module *owner = sock->ops->owner; | |
533 | ||
534 | sock->ops->release(sock); | |
535 | sock->ops = NULL; | |
536 | module_put(owner); | |
537 | } | |
538 | ||
539 | if (sock->fasync_list) | |
540 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); | |
541 | ||
542 | get_cpu_var(sockets_in_use)--; | |
543 | put_cpu_var(sockets_in_use); | |
544 | if (!sock->file) { | |
545 | iput(SOCK_INODE(sock)); | |
546 | return; | |
547 | } | |
89bddce5 | 548 | sock->file = NULL; |
1da177e4 LT |
549 | } |
550 | ||
89bddce5 | 551 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
552 | struct msghdr *msg, size_t size) |
553 | { | |
554 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
555 | int err; | |
556 | ||
557 | si->sock = sock; | |
558 | si->scm = NULL; | |
559 | si->msg = msg; | |
560 | si->size = size; | |
561 | ||
562 | err = security_socket_sendmsg(sock, msg, size); | |
563 | if (err) | |
564 | return err; | |
565 | ||
566 | return sock->ops->sendmsg(iocb, sock, msg, size); | |
567 | } | |
568 | ||
569 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | |
570 | { | |
571 | struct kiocb iocb; | |
572 | struct sock_iocb siocb; | |
573 | int ret; | |
574 | ||
575 | init_sync_kiocb(&iocb, NULL); | |
576 | iocb.private = &siocb; | |
577 | ret = __sock_sendmsg(&iocb, sock, msg, size); | |
578 | if (-EIOCBQUEUED == ret) | |
579 | ret = wait_on_sync_kiocb(&iocb); | |
580 | return ret; | |
581 | } | |
582 | ||
583 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
584 | struct kvec *vec, size_t num, size_t size) | |
585 | { | |
586 | mm_segment_t oldfs = get_fs(); | |
587 | int result; | |
588 | ||
589 | set_fs(KERNEL_DS); | |
590 | /* | |
591 | * the following is safe, since for compiler definitions of kvec and | |
592 | * iovec are identical, yielding the same in-core layout and alignment | |
593 | */ | |
89bddce5 | 594 | msg->msg_iov = (struct iovec *)vec; |
1da177e4 LT |
595 | msg->msg_iovlen = num; |
596 | result = sock_sendmsg(sock, msg, size); | |
597 | set_fs(oldfs); | |
598 | return result; | |
599 | } | |
600 | ||
89bddce5 | 601 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
602 | struct msghdr *msg, size_t size, int flags) |
603 | { | |
604 | int err; | |
605 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
606 | ||
607 | si->sock = sock; | |
608 | si->scm = NULL; | |
609 | si->msg = msg; | |
610 | si->size = size; | |
611 | si->flags = flags; | |
612 | ||
613 | err = security_socket_recvmsg(sock, msg, size, flags); | |
614 | if (err) | |
615 | return err; | |
616 | ||
617 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); | |
618 | } | |
619 | ||
89bddce5 | 620 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1da177e4 LT |
621 | size_t size, int flags) |
622 | { | |
623 | struct kiocb iocb; | |
624 | struct sock_iocb siocb; | |
625 | int ret; | |
626 | ||
89bddce5 | 627 | init_sync_kiocb(&iocb, NULL); |
1da177e4 LT |
628 | iocb.private = &siocb; |
629 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); | |
630 | if (-EIOCBQUEUED == ret) | |
631 | ret = wait_on_sync_kiocb(&iocb); | |
632 | return ret; | |
633 | } | |
634 | ||
89bddce5 SH |
635 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
636 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 LT |
637 | { |
638 | mm_segment_t oldfs = get_fs(); | |
639 | int result; | |
640 | ||
641 | set_fs(KERNEL_DS); | |
642 | /* | |
643 | * the following is safe, since for compiler definitions of kvec and | |
644 | * iovec are identical, yielding the same in-core layout and alignment | |
645 | */ | |
89bddce5 | 646 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
1da177e4 LT |
647 | result = sock_recvmsg(sock, msg, size, flags); |
648 | set_fs(oldfs); | |
649 | return result; | |
650 | } | |
651 | ||
652 | static void sock_aio_dtor(struct kiocb *iocb) | |
653 | { | |
654 | kfree(iocb->private); | |
655 | } | |
656 | ||
ce1d4d3e CH |
657 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
658 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 659 | { |
1da177e4 LT |
660 | struct socket *sock; |
661 | int flags; | |
662 | ||
ce1d4d3e CH |
663 | sock = file->private_data; |
664 | ||
665 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
666 | if (more) | |
667 | flags |= MSG_MORE; | |
668 | ||
669 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
670 | } | |
1da177e4 | 671 | |
ce1d4d3e | 672 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
89bddce5 | 673 | struct sock_iocb *siocb) |
ce1d4d3e CH |
674 | { |
675 | if (!is_sync_kiocb(iocb)) { | |
676 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); | |
677 | if (!siocb) | |
678 | return NULL; | |
1da177e4 LT |
679 | iocb->ki_dtor = sock_aio_dtor; |
680 | } | |
1da177e4 | 681 | |
ce1d4d3e | 682 | siocb->kiocb = iocb; |
ce1d4d3e CH |
683 | iocb->private = siocb; |
684 | return siocb; | |
1da177e4 LT |
685 | } |
686 | ||
ce1d4d3e | 687 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
688 | struct file *file, const struct iovec *iov, |
689 | unsigned long nr_segs) | |
ce1d4d3e CH |
690 | { |
691 | struct socket *sock = file->private_data; | |
692 | size_t size = 0; | |
693 | int i; | |
1da177e4 | 694 | |
89bddce5 SH |
695 | for (i = 0; i < nr_segs; i++) |
696 | size += iov[i].iov_len; | |
1da177e4 | 697 | |
ce1d4d3e CH |
698 | msg->msg_name = NULL; |
699 | msg->msg_namelen = 0; | |
700 | msg->msg_control = NULL; | |
701 | msg->msg_controllen = 0; | |
89bddce5 | 702 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
703 | msg->msg_iovlen = nr_segs; |
704 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
705 | ||
706 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); | |
707 | } | |
708 | ||
027445c3 BP |
709 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
710 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
711 | { |
712 | struct sock_iocb siocb, *x; | |
713 | ||
1da177e4 LT |
714 | if (pos != 0) |
715 | return -ESPIPE; | |
027445c3 BP |
716 | |
717 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
1da177e4 LT |
718 | return 0; |
719 | ||
027445c3 BP |
720 | |
721 | x = alloc_sock_iocb(iocb, &siocb); | |
ce1d4d3e CH |
722 | if (!x) |
723 | return -ENOMEM; | |
027445c3 | 724 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
725 | } |
726 | ||
ce1d4d3e | 727 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
728 | struct file *file, const struct iovec *iov, |
729 | unsigned long nr_segs) | |
1da177e4 | 730 | { |
ce1d4d3e CH |
731 | struct socket *sock = file->private_data; |
732 | size_t size = 0; | |
733 | int i; | |
1da177e4 | 734 | |
89bddce5 SH |
735 | for (i = 0; i < nr_segs; i++) |
736 | size += iov[i].iov_len; | |
1da177e4 | 737 | |
ce1d4d3e CH |
738 | msg->msg_name = NULL; |
739 | msg->msg_namelen = 0; | |
740 | msg->msg_control = NULL; | |
741 | msg->msg_controllen = 0; | |
89bddce5 | 742 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
743 | msg->msg_iovlen = nr_segs; |
744 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
745 | if (sock->type == SOCK_SEQPACKET) | |
746 | msg->msg_flags |= MSG_EOR; | |
1da177e4 | 747 | |
ce1d4d3e | 748 | return __sock_sendmsg(iocb, sock, msg, size); |
1da177e4 LT |
749 | } |
750 | ||
027445c3 BP |
751 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
752 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
753 | { |
754 | struct sock_iocb siocb, *x; | |
1da177e4 | 755 | |
ce1d4d3e CH |
756 | if (pos != 0) |
757 | return -ESPIPE; | |
027445c3 BP |
758 | |
759 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
ce1d4d3e | 760 | return 0; |
1da177e4 | 761 | |
027445c3 | 762 | x = alloc_sock_iocb(iocb, &siocb); |
ce1d4d3e CH |
763 | if (!x) |
764 | return -ENOMEM; | |
1da177e4 | 765 | |
027445c3 | 766 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
767 | } |
768 | ||
1da177e4 LT |
769 | /* |
770 | * Atomic setting of ioctl hooks to avoid race | |
771 | * with module unload. | |
772 | */ | |
773 | ||
4a3e2f71 | 774 | static DEFINE_MUTEX(br_ioctl_mutex); |
89bddce5 | 775 | static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL; |
1da177e4 | 776 | |
89bddce5 | 777 | void brioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 778 | { |
4a3e2f71 | 779 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 780 | br_ioctl_hook = hook; |
4a3e2f71 | 781 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 | 782 | } |
89bddce5 | 783 | |
1da177e4 LT |
784 | EXPORT_SYMBOL(brioctl_set); |
785 | ||
4a3e2f71 | 786 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
89bddce5 | 787 | static int (*vlan_ioctl_hook) (void __user *arg); |
1da177e4 | 788 | |
89bddce5 | 789 | void vlan_ioctl_set(int (*hook) (void __user *)) |
1da177e4 | 790 | { |
4a3e2f71 | 791 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 792 | vlan_ioctl_hook = hook; |
4a3e2f71 | 793 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 794 | } |
89bddce5 | 795 | |
1da177e4 LT |
796 | EXPORT_SYMBOL(vlan_ioctl_set); |
797 | ||
4a3e2f71 | 798 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
89bddce5 | 799 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1da177e4 | 800 | |
89bddce5 | 801 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 802 | { |
4a3e2f71 | 803 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 804 | dlci_ioctl_hook = hook; |
4a3e2f71 | 805 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 | 806 | } |
89bddce5 | 807 | |
1da177e4 LT |
808 | EXPORT_SYMBOL(dlci_ioctl_set); |
809 | ||
810 | /* | |
811 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
812 | * what to do with it - that's up to the protocol still. | |
813 | */ | |
814 | ||
815 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
816 | { | |
817 | struct socket *sock; | |
818 | void __user *argp = (void __user *)arg; | |
819 | int pid, err; | |
820 | ||
b69aee04 | 821 | sock = file->private_data; |
1da177e4 LT |
822 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
823 | err = dev_ioctl(cmd, argp); | |
824 | } else | |
d86b5e0e | 825 | #ifdef CONFIG_WIRELESS_EXT |
1da177e4 LT |
826 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
827 | err = dev_ioctl(cmd, argp); | |
828 | } else | |
89bddce5 SH |
829 | #endif /* CONFIG_WIRELESS_EXT */ |
830 | switch (cmd) { | |
1da177e4 LT |
831 | case FIOSETOWN: |
832 | case SIOCSPGRP: | |
833 | err = -EFAULT; | |
834 | if (get_user(pid, (int __user *)argp)) | |
835 | break; | |
836 | err = f_setown(sock->file, pid, 1); | |
837 | break; | |
838 | case FIOGETOWN: | |
839 | case SIOCGPGRP: | |
609d7fa9 | 840 | err = put_user(f_getown(sock->file), |
89bddce5 | 841 | (int __user *)argp); |
1da177e4 LT |
842 | break; |
843 | case SIOCGIFBR: | |
844 | case SIOCSIFBR: | |
845 | case SIOCBRADDBR: | |
846 | case SIOCBRDELBR: | |
847 | err = -ENOPKG; | |
848 | if (!br_ioctl_hook) | |
849 | request_module("bridge"); | |
850 | ||
4a3e2f71 | 851 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 852 | if (br_ioctl_hook) |
1da177e4 | 853 | err = br_ioctl_hook(cmd, argp); |
4a3e2f71 | 854 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
855 | break; |
856 | case SIOCGIFVLAN: | |
857 | case SIOCSIFVLAN: | |
858 | err = -ENOPKG; | |
859 | if (!vlan_ioctl_hook) | |
860 | request_module("8021q"); | |
861 | ||
4a3e2f71 | 862 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 LT |
863 | if (vlan_ioctl_hook) |
864 | err = vlan_ioctl_hook(argp); | |
4a3e2f71 | 865 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 866 | break; |
1da177e4 LT |
867 | case SIOCADDDLCI: |
868 | case SIOCDELDLCI: | |
869 | err = -ENOPKG; | |
870 | if (!dlci_ioctl_hook) | |
871 | request_module("dlci"); | |
872 | ||
873 | if (dlci_ioctl_hook) { | |
4a3e2f71 | 874 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 875 | err = dlci_ioctl_hook(cmd, argp); |
4a3e2f71 | 876 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 LT |
877 | } |
878 | break; | |
879 | default: | |
880 | err = sock->ops->ioctl(sock, cmd, arg); | |
b5e5fa5e CH |
881 | |
882 | /* | |
883 | * If this ioctl is unknown try to hand it down | |
884 | * to the NIC driver. | |
885 | */ | |
886 | if (err == -ENOIOCTLCMD) | |
887 | err = dev_ioctl(cmd, argp); | |
1da177e4 | 888 | break; |
89bddce5 | 889 | } |
1da177e4 LT |
890 | return err; |
891 | } | |
892 | ||
893 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
894 | { | |
895 | int err; | |
896 | struct socket *sock = NULL; | |
89bddce5 | 897 | |
1da177e4 LT |
898 | err = security_socket_create(family, type, protocol, 1); |
899 | if (err) | |
900 | goto out; | |
901 | ||
902 | sock = sock_alloc(); | |
903 | if (!sock) { | |
904 | err = -ENOMEM; | |
905 | goto out; | |
906 | } | |
907 | ||
1da177e4 | 908 | sock->type = type; |
7420ed23 VY |
909 | err = security_socket_post_create(sock, family, type, protocol, 1); |
910 | if (err) | |
911 | goto out_release; | |
912 | ||
1da177e4 LT |
913 | out: |
914 | *res = sock; | |
915 | return err; | |
7420ed23 VY |
916 | out_release: |
917 | sock_release(sock); | |
918 | sock = NULL; | |
919 | goto out; | |
1da177e4 LT |
920 | } |
921 | ||
922 | /* No kernel lock held - perfect */ | |
89bddce5 | 923 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
924 | { |
925 | struct socket *sock; | |
926 | ||
927 | /* | |
89bddce5 | 928 | * We can't return errors to poll, so it's either yes or no. |
1da177e4 | 929 | */ |
b69aee04 | 930 | sock = file->private_data; |
1da177e4 LT |
931 | return sock->ops->poll(file, sock, wait); |
932 | } | |
933 | ||
89bddce5 | 934 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 935 | { |
b69aee04 | 936 | struct socket *sock = file->private_data; |
1da177e4 LT |
937 | |
938 | return sock->ops->mmap(file, sock, vma); | |
939 | } | |
940 | ||
20380731 | 941 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
942 | { |
943 | /* | |
89bddce5 SH |
944 | * It was possible the inode is NULL we were |
945 | * closing an unfinished socket. | |
1da177e4 LT |
946 | */ |
947 | ||
89bddce5 | 948 | if (!inode) { |
1da177e4 LT |
949 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
950 | return 0; | |
951 | } | |
952 | sock_fasync(-1, filp, 0); | |
953 | sock_release(SOCKET_I(inode)); | |
954 | return 0; | |
955 | } | |
956 | ||
957 | /* | |
958 | * Update the socket async list | |
959 | * | |
960 | * Fasync_list locking strategy. | |
961 | * | |
962 | * 1. fasync_list is modified only under process context socket lock | |
963 | * i.e. under semaphore. | |
964 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
965 | * or under socket lock. | |
966 | * 3. fasync_list can be used from softirq context, so that | |
967 | * modification under socket lock have to be enhanced with | |
968 | * write_lock_bh(&sk->sk_callback_lock). | |
969 | * --ANK (990710) | |
970 | */ | |
971 | ||
972 | static int sock_fasync(int fd, struct file *filp, int on) | |
973 | { | |
89bddce5 | 974 | struct fasync_struct *fa, *fna = NULL, **prev; |
1da177e4 LT |
975 | struct socket *sock; |
976 | struct sock *sk; | |
977 | ||
89bddce5 | 978 | if (on) { |
8b3a7005 | 979 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
89bddce5 | 980 | if (fna == NULL) |
1da177e4 LT |
981 | return -ENOMEM; |
982 | } | |
983 | ||
b69aee04 | 984 | sock = filp->private_data; |
1da177e4 | 985 | |
89bddce5 SH |
986 | sk = sock->sk; |
987 | if (sk == NULL) { | |
1da177e4 LT |
988 | kfree(fna); |
989 | return -EINVAL; | |
990 | } | |
991 | ||
992 | lock_sock(sk); | |
993 | ||
89bddce5 | 994 | prev = &(sock->fasync_list); |
1da177e4 | 995 | |
89bddce5 SH |
996 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) |
997 | if (fa->fa_file == filp) | |
1da177e4 LT |
998 | break; |
999 | ||
89bddce5 SH |
1000 | if (on) { |
1001 | if (fa != NULL) { | |
1da177e4 | 1002 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1003 | fa->fa_fd = fd; |
1da177e4 LT |
1004 | write_unlock_bh(&sk->sk_callback_lock); |
1005 | ||
1006 | kfree(fna); | |
1007 | goto out; | |
1008 | } | |
89bddce5 SH |
1009 | fna->fa_file = filp; |
1010 | fna->fa_fd = fd; | |
1011 | fna->magic = FASYNC_MAGIC; | |
1012 | fna->fa_next = sock->fasync_list; | |
1da177e4 | 1013 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1014 | sock->fasync_list = fna; |
1da177e4 | 1015 | write_unlock_bh(&sk->sk_callback_lock); |
89bddce5 SH |
1016 | } else { |
1017 | if (fa != NULL) { | |
1da177e4 | 1018 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1019 | *prev = fa->fa_next; |
1da177e4 LT |
1020 | write_unlock_bh(&sk->sk_callback_lock); |
1021 | kfree(fa); | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | out: | |
1026 | release_sock(sock->sk); | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | /* This function may be called only under socket lock or callback_lock */ | |
1031 | ||
1032 | int sock_wake_async(struct socket *sock, int how, int band) | |
1033 | { | |
1034 | if (!sock || !sock->fasync_list) | |
1035 | return -1; | |
89bddce5 | 1036 | switch (how) { |
1da177e4 | 1037 | case 1: |
89bddce5 | 1038 | |
1da177e4 LT |
1039 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1040 | break; | |
1041 | goto call_kill; | |
1042 | case 2: | |
1043 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) | |
1044 | break; | |
1045 | /* fall through */ | |
1046 | case 0: | |
89bddce5 | 1047 | call_kill: |
1da177e4 LT |
1048 | __kill_fasync(sock->fasync_list, SIGIO, band); |
1049 | break; | |
1050 | case 3: | |
1051 | __kill_fasync(sock->fasync_list, SIGURG, band); | |
1052 | } | |
1053 | return 0; | |
1054 | } | |
1055 | ||
89bddce5 SH |
1056 | static int __sock_create(int family, int type, int protocol, |
1057 | struct socket **res, int kern) | |
1da177e4 LT |
1058 | { |
1059 | int err; | |
1060 | struct socket *sock; | |
55737fda | 1061 | const struct net_proto_family *pf; |
1da177e4 LT |
1062 | |
1063 | /* | |
89bddce5 | 1064 | * Check protocol is in range |
1da177e4 LT |
1065 | */ |
1066 | if (family < 0 || family >= NPROTO) | |
1067 | return -EAFNOSUPPORT; | |
1068 | if (type < 0 || type >= SOCK_MAX) | |
1069 | return -EINVAL; | |
1070 | ||
1071 | /* Compatibility. | |
1072 | ||
1073 | This uglymoron is moved from INET layer to here to avoid | |
1074 | deadlock in module load. | |
1075 | */ | |
1076 | if (family == PF_INET && type == SOCK_PACKET) { | |
89bddce5 | 1077 | static int warned; |
1da177e4 LT |
1078 | if (!warned) { |
1079 | warned = 1; | |
89bddce5 SH |
1080 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1081 | current->comm); | |
1da177e4 LT |
1082 | } |
1083 | family = PF_PACKET; | |
1084 | } | |
1085 | ||
1086 | err = security_socket_create(family, type, protocol, kern); | |
1087 | if (err) | |
1088 | return err; | |
89bddce5 | 1089 | |
55737fda SH |
1090 | /* |
1091 | * Allocate the socket and allow the family to set things up. if | |
1092 | * the protocol is 0, the family is instructed to select an appropriate | |
1093 | * default. | |
1094 | */ | |
1095 | sock = sock_alloc(); | |
1096 | if (!sock) { | |
1097 | if (net_ratelimit()) | |
1098 | printk(KERN_WARNING "socket: no more sockets\n"); | |
1099 | return -ENFILE; /* Not exactly a match, but its the | |
1100 | closest posix thing */ | |
1101 | } | |
1102 | ||
1103 | sock->type = type; | |
1104 | ||
1da177e4 | 1105 | #if defined(CONFIG_KMOD) |
89bddce5 SH |
1106 | /* Attempt to load a protocol module if the find failed. |
1107 | * | |
1108 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1109 | * requested real, full-featured networking support upon configuration. |
1110 | * Otherwise module support will break! | |
1111 | */ | |
55737fda | 1112 | if (net_families[family] == NULL) |
89bddce5 | 1113 | request_module("net-pf-%d", family); |
1da177e4 LT |
1114 | #endif |
1115 | ||
55737fda SH |
1116 | rcu_read_lock(); |
1117 | pf = rcu_dereference(net_families[family]); | |
1118 | err = -EAFNOSUPPORT; | |
1119 | if (!pf) | |
1120 | goto out_release; | |
1da177e4 LT |
1121 | |
1122 | /* | |
1123 | * We will call the ->create function, that possibly is in a loadable | |
1124 | * module, so we have to bump that loadable module refcnt first. | |
1125 | */ | |
55737fda | 1126 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1127 | goto out_release; |
1128 | ||
55737fda SH |
1129 | /* Now protected by module ref count */ |
1130 | rcu_read_unlock(); | |
1131 | ||
1132 | err = pf->create(sock, protocol); | |
1133 | if (err < 0) | |
1da177e4 | 1134 | goto out_module_put; |
a79af59e | 1135 | |
1da177e4 LT |
1136 | /* |
1137 | * Now to bump the refcnt of the [loadable] module that owns this | |
1138 | * socket at sock_release time we decrement its refcnt. | |
1139 | */ | |
55737fda SH |
1140 | if (!try_module_get(sock->ops->owner)) |
1141 | goto out_module_busy; | |
1142 | ||
1da177e4 LT |
1143 | /* |
1144 | * Now that we're done with the ->create function, the [loadable] | |
1145 | * module can have its refcnt decremented | |
1146 | */ | |
55737fda | 1147 | module_put(pf->owner); |
7420ed23 VY |
1148 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1149 | if (err) | |
1150 | goto out_release; | |
55737fda | 1151 | *res = sock; |
1da177e4 | 1152 | |
55737fda SH |
1153 | return 0; |
1154 | ||
1155 | out_module_busy: | |
1156 | err = -EAFNOSUPPORT; | |
1da177e4 | 1157 | out_module_put: |
55737fda SH |
1158 | sock->ops = NULL; |
1159 | module_put(pf->owner); | |
1160 | out_sock_release: | |
1da177e4 | 1161 | sock_release(sock); |
55737fda SH |
1162 | return err; |
1163 | ||
1164 | out_release: | |
1165 | rcu_read_unlock(); | |
1166 | goto out_sock_release; | |
1da177e4 LT |
1167 | } |
1168 | ||
1169 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1170 | { | |
1171 | return __sock_create(family, type, protocol, res, 0); | |
1172 | } | |
1173 | ||
1174 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1175 | { | |
1176 | return __sock_create(family, type, protocol, res, 1); | |
1177 | } | |
1178 | ||
1179 | asmlinkage long sys_socket(int family, int type, int protocol) | |
1180 | { | |
1181 | int retval; | |
1182 | struct socket *sock; | |
1183 | ||
1184 | retval = sock_create(family, type, protocol, &sock); | |
1185 | if (retval < 0) | |
1186 | goto out; | |
1187 | ||
1188 | retval = sock_map_fd(sock); | |
1189 | if (retval < 0) | |
1190 | goto out_release; | |
1191 | ||
1192 | out: | |
1193 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1194 | return retval; | |
1195 | ||
1196 | out_release: | |
1197 | sock_release(sock); | |
1198 | return retval; | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Create a pair of connected sockets. | |
1203 | */ | |
1204 | ||
89bddce5 SH |
1205 | asmlinkage long sys_socketpair(int family, int type, int protocol, |
1206 | int __user *usockvec) | |
1da177e4 LT |
1207 | { |
1208 | struct socket *sock1, *sock2; | |
1209 | int fd1, fd2, err; | |
1210 | ||
1211 | /* | |
1212 | * Obtain the first socket and check if the underlying protocol | |
1213 | * supports the socketpair call. | |
1214 | */ | |
1215 | ||
1216 | err = sock_create(family, type, protocol, &sock1); | |
1217 | if (err < 0) | |
1218 | goto out; | |
1219 | ||
1220 | err = sock_create(family, type, protocol, &sock2); | |
1221 | if (err < 0) | |
1222 | goto out_release_1; | |
1223 | ||
1224 | err = sock1->ops->socketpair(sock1, sock2); | |
89bddce5 | 1225 | if (err < 0) |
1da177e4 LT |
1226 | goto out_release_both; |
1227 | ||
1228 | fd1 = fd2 = -1; | |
1229 | ||
1230 | err = sock_map_fd(sock1); | |
1231 | if (err < 0) | |
1232 | goto out_release_both; | |
1233 | fd1 = err; | |
1234 | ||
1235 | err = sock_map_fd(sock2); | |
1236 | if (err < 0) | |
1237 | goto out_close_1; | |
1238 | fd2 = err; | |
1239 | ||
1240 | /* fd1 and fd2 may be already another descriptors. | |
1241 | * Not kernel problem. | |
1242 | */ | |
1243 | ||
89bddce5 | 1244 | err = put_user(fd1, &usockvec[0]); |
1da177e4 LT |
1245 | if (!err) |
1246 | err = put_user(fd2, &usockvec[1]); | |
1247 | if (!err) | |
1248 | return 0; | |
1249 | ||
1250 | sys_close(fd2); | |
1251 | sys_close(fd1); | |
1252 | return err; | |
1253 | ||
1254 | out_close_1: | |
89bddce5 | 1255 | sock_release(sock2); |
1da177e4 LT |
1256 | sys_close(fd1); |
1257 | return err; | |
1258 | ||
1259 | out_release_both: | |
89bddce5 | 1260 | sock_release(sock2); |
1da177e4 | 1261 | out_release_1: |
89bddce5 | 1262 | sock_release(sock1); |
1da177e4 LT |
1263 | out: |
1264 | return err; | |
1265 | } | |
1266 | ||
1da177e4 LT |
1267 | /* |
1268 | * Bind a name to a socket. Nothing much to do here since it's | |
1269 | * the protocol's responsibility to handle the local address. | |
1270 | * | |
1271 | * We move the socket address to kernel space before we call | |
1272 | * the protocol layer (having also checked the address is ok). | |
1273 | */ | |
1274 | ||
1275 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) | |
1276 | { | |
1277 | struct socket *sock; | |
1278 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1279 | int err, fput_needed; |
1da177e4 | 1280 | |
89bddce5 SH |
1281 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1282 | if(sock) { | |
1283 | err = move_addr_to_kernel(umyaddr, addrlen, address); | |
1284 | if (err >= 0) { | |
1285 | err = security_socket_bind(sock, | |
1286 | (struct sockaddr *)address, | |
1287 | addrlen); | |
6cb153ca BL |
1288 | if (!err) |
1289 | err = sock->ops->bind(sock, | |
89bddce5 SH |
1290 | (struct sockaddr *) |
1291 | address, addrlen); | |
1da177e4 | 1292 | } |
6cb153ca | 1293 | fput_light(sock->file, fput_needed); |
89bddce5 | 1294 | } |
1da177e4 LT |
1295 | return err; |
1296 | } | |
1297 | ||
1da177e4 LT |
1298 | /* |
1299 | * Perform a listen. Basically, we allow the protocol to do anything | |
1300 | * necessary for a listen, and if that works, we mark the socket as | |
1301 | * ready for listening. | |
1302 | */ | |
1303 | ||
7a42c217 | 1304 | int sysctl_somaxconn __read_mostly = SOMAXCONN; |
1da177e4 LT |
1305 | |
1306 | asmlinkage long sys_listen(int fd, int backlog) | |
1307 | { | |
1308 | struct socket *sock; | |
6cb153ca | 1309 | int err, fput_needed; |
89bddce5 SH |
1310 | |
1311 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1312 | if (sock) { | |
1313 | if ((unsigned)backlog > sysctl_somaxconn) | |
1da177e4 LT |
1314 | backlog = sysctl_somaxconn; |
1315 | ||
1316 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1317 | if (!err) |
1318 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1319 | |
6cb153ca | 1320 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1321 | } |
1322 | return err; | |
1323 | } | |
1324 | ||
1da177e4 LT |
1325 | /* |
1326 | * For accept, we attempt to create a new socket, set up the link | |
1327 | * with the client, wake up the client, then return the new | |
1328 | * connected fd. We collect the address of the connector in kernel | |
1329 | * space and move it to user at the very end. This is unclean because | |
1330 | * we open the socket then return an error. | |
1331 | * | |
1332 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1333 | * status to recvmsg. We need to add that support in a way thats | |
1334 | * clean when we restucture accept also. | |
1335 | */ | |
1336 | ||
89bddce5 SH |
1337 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, |
1338 | int __user *upeer_addrlen) | |
1da177e4 LT |
1339 | { |
1340 | struct socket *sock, *newsock; | |
39d8c1b6 | 1341 | struct file *newfile; |
6cb153ca | 1342 | int err, len, newfd, fput_needed; |
1da177e4 LT |
1343 | char address[MAX_SOCK_ADDR]; |
1344 | ||
6cb153ca | 1345 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1346 | if (!sock) |
1347 | goto out; | |
1348 | ||
1349 | err = -ENFILE; | |
89bddce5 | 1350 | if (!(newsock = sock_alloc())) |
1da177e4 LT |
1351 | goto out_put; |
1352 | ||
1353 | newsock->type = sock->type; | |
1354 | newsock->ops = sock->ops; | |
1355 | ||
1da177e4 LT |
1356 | /* |
1357 | * We don't need try_module_get here, as the listening socket (sock) | |
1358 | * has the protocol module (sock->ops->owner) held. | |
1359 | */ | |
1360 | __module_get(newsock->ops->owner); | |
1361 | ||
39d8c1b6 DM |
1362 | newfd = sock_alloc_fd(&newfile); |
1363 | if (unlikely(newfd < 0)) { | |
1364 | err = newfd; | |
9a1875e6 DM |
1365 | sock_release(newsock); |
1366 | goto out_put; | |
39d8c1b6 DM |
1367 | } |
1368 | ||
1369 | err = sock_attach_fd(newsock, newfile); | |
1370 | if (err < 0) | |
1371 | goto out_fd; | |
1372 | ||
a79af59e FF |
1373 | err = security_socket_accept(sock, newsock); |
1374 | if (err) | |
39d8c1b6 | 1375 | goto out_fd; |
a79af59e | 1376 | |
1da177e4 LT |
1377 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1378 | if (err < 0) | |
39d8c1b6 | 1379 | goto out_fd; |
1da177e4 LT |
1380 | |
1381 | if (upeer_sockaddr) { | |
89bddce5 SH |
1382 | if (newsock->ops->getname(newsock, (struct sockaddr *)address, |
1383 | &len, 2) < 0) { | |
1da177e4 | 1384 | err = -ECONNABORTED; |
39d8c1b6 | 1385 | goto out_fd; |
1da177e4 | 1386 | } |
89bddce5 SH |
1387 | err = move_addr_to_user(address, len, upeer_sockaddr, |
1388 | upeer_addrlen); | |
1da177e4 | 1389 | if (err < 0) |
39d8c1b6 | 1390 | goto out_fd; |
1da177e4 LT |
1391 | } |
1392 | ||
1393 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1394 | ||
39d8c1b6 DM |
1395 | fd_install(newfd, newfile); |
1396 | err = newfd; | |
1da177e4 LT |
1397 | |
1398 | security_socket_post_accept(sock, newsock); | |
1399 | ||
1400 | out_put: | |
6cb153ca | 1401 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1402 | out: |
1403 | return err; | |
39d8c1b6 | 1404 | out_fd: |
9606a216 | 1405 | fput(newfile); |
39d8c1b6 | 1406 | put_unused_fd(newfd); |
1da177e4 LT |
1407 | goto out_put; |
1408 | } | |
1409 | ||
1da177e4 LT |
1410 | /* |
1411 | * Attempt to connect to a socket with the server address. The address | |
1412 | * is in user space so we verify it is OK and move it to kernel space. | |
1413 | * | |
1414 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1415 | * break bindings | |
1416 | * | |
1417 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1418 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1419 | * include the -EINPROGRESS status for such sockets. | |
1420 | */ | |
1421 | ||
89bddce5 SH |
1422 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, |
1423 | int addrlen) | |
1da177e4 LT |
1424 | { |
1425 | struct socket *sock; | |
1426 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1427 | int err, fput_needed; |
1da177e4 | 1428 | |
6cb153ca | 1429 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1430 | if (!sock) |
1431 | goto out; | |
1432 | err = move_addr_to_kernel(uservaddr, addrlen, address); | |
1433 | if (err < 0) | |
1434 | goto out_put; | |
1435 | ||
89bddce5 SH |
1436 | err = |
1437 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); | |
1da177e4 LT |
1438 | if (err) |
1439 | goto out_put; | |
1440 | ||
89bddce5 | 1441 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
1da177e4 LT |
1442 | sock->file->f_flags); |
1443 | out_put: | |
6cb153ca | 1444 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1445 | out: |
1446 | return err; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * Get the local address ('name') of a socket object. Move the obtained | |
1451 | * name to user space. | |
1452 | */ | |
1453 | ||
89bddce5 SH |
1454 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1455 | int __user *usockaddr_len) | |
1da177e4 LT |
1456 | { |
1457 | struct socket *sock; | |
1458 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1459 | int len, err, fput_needed; |
89bddce5 | 1460 | |
6cb153ca | 1461 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1462 | if (!sock) |
1463 | goto out; | |
1464 | ||
1465 | err = security_socket_getsockname(sock); | |
1466 | if (err) | |
1467 | goto out_put; | |
1468 | ||
1469 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); | |
1470 | if (err) | |
1471 | goto out_put; | |
1472 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); | |
1473 | ||
1474 | out_put: | |
6cb153ca | 1475 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1476 | out: |
1477 | return err; | |
1478 | } | |
1479 | ||
1480 | /* | |
1481 | * Get the remote address ('name') of a socket object. Move the obtained | |
1482 | * name to user space. | |
1483 | */ | |
1484 | ||
89bddce5 SH |
1485 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1486 | int __user *usockaddr_len) | |
1da177e4 LT |
1487 | { |
1488 | struct socket *sock; | |
1489 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1490 | int len, err, fput_needed; |
1da177e4 | 1491 | |
89bddce5 SH |
1492 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1493 | if (sock != NULL) { | |
1da177e4 LT |
1494 | err = security_socket_getpeername(sock); |
1495 | if (err) { | |
6cb153ca | 1496 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1497 | return err; |
1498 | } | |
1499 | ||
89bddce5 SH |
1500 | err = |
1501 | sock->ops->getname(sock, (struct sockaddr *)address, &len, | |
1502 | 1); | |
1da177e4 | 1503 | if (!err) |
89bddce5 SH |
1504 | err = move_addr_to_user(address, len, usockaddr, |
1505 | usockaddr_len); | |
6cb153ca | 1506 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1507 | } |
1508 | return err; | |
1509 | } | |
1510 | ||
1511 | /* | |
1512 | * Send a datagram to a given address. We move the address into kernel | |
1513 | * space and check the user space data area is readable before invoking | |
1514 | * the protocol. | |
1515 | */ | |
1516 | ||
89bddce5 SH |
1517 | asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, |
1518 | unsigned flags, struct sockaddr __user *addr, | |
1519 | int addr_len) | |
1da177e4 LT |
1520 | { |
1521 | struct socket *sock; | |
1522 | char address[MAX_SOCK_ADDR]; | |
1523 | int err; | |
1524 | struct msghdr msg; | |
1525 | struct iovec iov; | |
6cb153ca BL |
1526 | int fput_needed; |
1527 | struct file *sock_file; | |
1528 | ||
1529 | sock_file = fget_light(fd, &fput_needed); | |
1530 | if (!sock_file) | |
1531 | return -EBADF; | |
1532 | ||
1533 | sock = sock_from_file(sock_file, &err); | |
1da177e4 | 1534 | if (!sock) |
6cb153ca | 1535 | goto out_put; |
89bddce5 SH |
1536 | iov.iov_base = buff; |
1537 | iov.iov_len = len; | |
1538 | msg.msg_name = NULL; | |
1539 | msg.msg_iov = &iov; | |
1540 | msg.msg_iovlen = 1; | |
1541 | msg.msg_control = NULL; | |
1542 | msg.msg_controllen = 0; | |
1543 | msg.msg_namelen = 0; | |
6cb153ca | 1544 | if (addr) { |
1da177e4 LT |
1545 | err = move_addr_to_kernel(addr, addr_len, address); |
1546 | if (err < 0) | |
1547 | goto out_put; | |
89bddce5 SH |
1548 | msg.msg_name = address; |
1549 | msg.msg_namelen = addr_len; | |
1da177e4 LT |
1550 | } |
1551 | if (sock->file->f_flags & O_NONBLOCK) | |
1552 | flags |= MSG_DONTWAIT; | |
1553 | msg.msg_flags = flags; | |
1554 | err = sock_sendmsg(sock, &msg, len); | |
1555 | ||
89bddce5 | 1556 | out_put: |
6cb153ca | 1557 | fput_light(sock_file, fput_needed); |
1da177e4 LT |
1558 | return err; |
1559 | } | |
1560 | ||
1561 | /* | |
89bddce5 | 1562 | * Send a datagram down a socket. |
1da177e4 LT |
1563 | */ |
1564 | ||
89bddce5 | 1565 | asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) |
1da177e4 LT |
1566 | { |
1567 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1568 | } | |
1569 | ||
1570 | /* | |
89bddce5 | 1571 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
1572 | * sender. We verify the buffers are writable and if needed move the |
1573 | * sender address from kernel to user space. | |
1574 | */ | |
1575 | ||
89bddce5 SH |
1576 | asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, |
1577 | unsigned flags, struct sockaddr __user *addr, | |
1578 | int __user *addr_len) | |
1da177e4 LT |
1579 | { |
1580 | struct socket *sock; | |
1581 | struct iovec iov; | |
1582 | struct msghdr msg; | |
1583 | char address[MAX_SOCK_ADDR]; | |
89bddce5 | 1584 | int err, err2; |
6cb153ca BL |
1585 | struct file *sock_file; |
1586 | int fput_needed; | |
1587 | ||
1588 | sock_file = fget_light(fd, &fput_needed); | |
1589 | if (!sock_file) | |
1590 | return -EBADF; | |
1da177e4 | 1591 | |
6cb153ca | 1592 | sock = sock_from_file(sock_file, &err); |
1da177e4 LT |
1593 | if (!sock) |
1594 | goto out; | |
1595 | ||
89bddce5 SH |
1596 | msg.msg_control = NULL; |
1597 | msg.msg_controllen = 0; | |
1598 | msg.msg_iovlen = 1; | |
1599 | msg.msg_iov = &iov; | |
1600 | iov.iov_len = size; | |
1601 | iov.iov_base = ubuf; | |
1602 | msg.msg_name = address; | |
1603 | msg.msg_namelen = MAX_SOCK_ADDR; | |
1da177e4 LT |
1604 | if (sock->file->f_flags & O_NONBLOCK) |
1605 | flags |= MSG_DONTWAIT; | |
89bddce5 | 1606 | err = sock_recvmsg(sock, &msg, size, flags); |
1da177e4 | 1607 | |
89bddce5 SH |
1608 | if (err >= 0 && addr != NULL) { |
1609 | err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); | |
1610 | if (err2 < 0) | |
1611 | err = err2; | |
1da177e4 | 1612 | } |
1da177e4 | 1613 | out: |
6cb153ca | 1614 | fput_light(sock_file, fput_needed); |
1da177e4 LT |
1615 | return err; |
1616 | } | |
1617 | ||
1618 | /* | |
89bddce5 | 1619 | * Receive a datagram from a socket. |
1da177e4 LT |
1620 | */ |
1621 | ||
89bddce5 SH |
1622 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
1623 | unsigned flags) | |
1da177e4 LT |
1624 | { |
1625 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * Set a socket option. Because we don't know the option lengths we have | |
1630 | * to pass the user mode parameter for the protocols to sort out. | |
1631 | */ | |
1632 | ||
89bddce5 SH |
1633 | asmlinkage long sys_setsockopt(int fd, int level, int optname, |
1634 | char __user *optval, int optlen) | |
1da177e4 | 1635 | { |
6cb153ca | 1636 | int err, fput_needed; |
1da177e4 LT |
1637 | struct socket *sock; |
1638 | ||
1639 | if (optlen < 0) | |
1640 | return -EINVAL; | |
89bddce5 SH |
1641 | |
1642 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1643 | if (sock != NULL) { | |
1644 | err = security_socket_setsockopt(sock, level, optname); | |
6cb153ca BL |
1645 | if (err) |
1646 | goto out_put; | |
1da177e4 LT |
1647 | |
1648 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1649 | err = |
1650 | sock_setsockopt(sock, level, optname, optval, | |
1651 | optlen); | |
1da177e4 | 1652 | else |
89bddce5 SH |
1653 | err = |
1654 | sock->ops->setsockopt(sock, level, optname, optval, | |
1655 | optlen); | |
6cb153ca BL |
1656 | out_put: |
1657 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1658 | } |
1659 | return err; | |
1660 | } | |
1661 | ||
1662 | /* | |
1663 | * Get a socket option. Because we don't know the option lengths we have | |
1664 | * to pass a user mode parameter for the protocols to sort out. | |
1665 | */ | |
1666 | ||
89bddce5 SH |
1667 | asmlinkage long sys_getsockopt(int fd, int level, int optname, |
1668 | char __user *optval, int __user *optlen) | |
1da177e4 | 1669 | { |
6cb153ca | 1670 | int err, fput_needed; |
1da177e4 LT |
1671 | struct socket *sock; |
1672 | ||
89bddce5 SH |
1673 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1674 | if (sock != NULL) { | |
6cb153ca BL |
1675 | err = security_socket_getsockopt(sock, level, optname); |
1676 | if (err) | |
1677 | goto out_put; | |
1da177e4 LT |
1678 | |
1679 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1680 | err = |
1681 | sock_getsockopt(sock, level, optname, optval, | |
1682 | optlen); | |
1da177e4 | 1683 | else |
89bddce5 SH |
1684 | err = |
1685 | sock->ops->getsockopt(sock, level, optname, optval, | |
1686 | optlen); | |
6cb153ca BL |
1687 | out_put: |
1688 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1689 | } |
1690 | return err; | |
1691 | } | |
1692 | ||
1da177e4 LT |
1693 | /* |
1694 | * Shutdown a socket. | |
1695 | */ | |
1696 | ||
1697 | asmlinkage long sys_shutdown(int fd, int how) | |
1698 | { | |
6cb153ca | 1699 | int err, fput_needed; |
1da177e4 LT |
1700 | struct socket *sock; |
1701 | ||
89bddce5 SH |
1702 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1703 | if (sock != NULL) { | |
1da177e4 | 1704 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
1705 | if (!err) |
1706 | err = sock->ops->shutdown(sock, how); | |
1707 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1708 | } |
1709 | return err; | |
1710 | } | |
1711 | ||
89bddce5 | 1712 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
1713 | * fields which are the same type (int / unsigned) on our platforms. |
1714 | */ | |
1715 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1716 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1717 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1718 | ||
1da177e4 LT |
1719 | /* |
1720 | * BSD sendmsg interface | |
1721 | */ | |
1722 | ||
1723 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
1724 | { | |
89bddce5 SH |
1725 | struct compat_msghdr __user *msg_compat = |
1726 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1727 | struct socket *sock; |
1728 | char address[MAX_SOCK_ADDR]; | |
1729 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
b9d717a7 | 1730 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
89bddce5 SH |
1731 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
1732 | /* 20 is size of ipv6_pktinfo */ | |
1da177e4 LT |
1733 | unsigned char *ctl_buf = ctl; |
1734 | struct msghdr msg_sys; | |
1735 | int err, ctl_len, iov_size, total_len; | |
6cb153ca | 1736 | int fput_needed; |
89bddce5 | 1737 | |
1da177e4 LT |
1738 | err = -EFAULT; |
1739 | if (MSG_CMSG_COMPAT & flags) { | |
1740 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1741 | return -EFAULT; | |
89bddce5 SH |
1742 | } |
1743 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1da177e4 LT |
1744 | return -EFAULT; |
1745 | ||
6cb153ca | 1746 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
89bddce5 | 1747 | if (!sock) |
1da177e4 LT |
1748 | goto out; |
1749 | ||
1750 | /* do not move before msg_sys is valid */ | |
1751 | err = -EMSGSIZE; | |
1752 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1753 | goto out_put; | |
1754 | ||
89bddce5 | 1755 | /* Check whether to allocate the iovec area */ |
1da177e4 LT |
1756 | err = -ENOMEM; |
1757 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1758 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1759 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1760 | if (!iov) | |
1761 | goto out_put; | |
1762 | } | |
1763 | ||
1764 | /* This will also move the address data into kernel space */ | |
1765 | if (MSG_CMSG_COMPAT & flags) { | |
1766 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); | |
1767 | } else | |
1768 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); | |
89bddce5 | 1769 | if (err < 0) |
1da177e4 LT |
1770 | goto out_freeiov; |
1771 | total_len = err; | |
1772 | ||
1773 | err = -ENOBUFS; | |
1774 | ||
1775 | if (msg_sys.msg_controllen > INT_MAX) | |
1776 | goto out_freeiov; | |
89bddce5 | 1777 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1778 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 SH |
1779 | err = |
1780 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, | |
1781 | sizeof(ctl)); | |
1da177e4 LT |
1782 | if (err) |
1783 | goto out_freeiov; | |
1784 | ctl_buf = msg_sys.msg_control; | |
8920e8f9 | 1785 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1786 | } else if (ctl_len) { |
89bddce5 | 1787 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 1788 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 1789 | if (ctl_buf == NULL) |
1da177e4 LT |
1790 | goto out_freeiov; |
1791 | } | |
1792 | err = -EFAULT; | |
1793 | /* | |
1794 | * Careful! Before this, msg_sys.msg_control contains a user pointer. | |
1795 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1796 | * checking falls down on this. | |
1797 | */ | |
89bddce5 SH |
1798 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, |
1799 | ctl_len)) | |
1da177e4 LT |
1800 | goto out_freectl; |
1801 | msg_sys.msg_control = ctl_buf; | |
1802 | } | |
1803 | msg_sys.msg_flags = flags; | |
1804 | ||
1805 | if (sock->file->f_flags & O_NONBLOCK) | |
1806 | msg_sys.msg_flags |= MSG_DONTWAIT; | |
1807 | err = sock_sendmsg(sock, &msg_sys, total_len); | |
1808 | ||
1809 | out_freectl: | |
89bddce5 | 1810 | if (ctl_buf != ctl) |
1da177e4 LT |
1811 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
1812 | out_freeiov: | |
1813 | if (iov != iovstack) | |
1814 | sock_kfree_s(sock->sk, iov, iov_size); | |
1815 | out_put: | |
6cb153ca | 1816 | fput_light(sock->file, fput_needed); |
89bddce5 | 1817 | out: |
1da177e4 LT |
1818 | return err; |
1819 | } | |
1820 | ||
1821 | /* | |
1822 | * BSD recvmsg interface | |
1823 | */ | |
1824 | ||
89bddce5 SH |
1825 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, |
1826 | unsigned int flags) | |
1da177e4 | 1827 | { |
89bddce5 SH |
1828 | struct compat_msghdr __user *msg_compat = |
1829 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1830 | struct socket *sock; |
1831 | struct iovec iovstack[UIO_FASTIOV]; | |
89bddce5 | 1832 | struct iovec *iov = iovstack; |
1da177e4 LT |
1833 | struct msghdr msg_sys; |
1834 | unsigned long cmsg_ptr; | |
1835 | int err, iov_size, total_len, len; | |
6cb153ca | 1836 | int fput_needed; |
1da177e4 LT |
1837 | |
1838 | /* kernel mode address */ | |
1839 | char addr[MAX_SOCK_ADDR]; | |
1840 | ||
1841 | /* user mode address pointers */ | |
1842 | struct sockaddr __user *uaddr; | |
1843 | int __user *uaddr_len; | |
89bddce5 | 1844 | |
1da177e4 LT |
1845 | if (MSG_CMSG_COMPAT & flags) { |
1846 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1847 | return -EFAULT; | |
89bddce5 SH |
1848 | } |
1849 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1850 | return -EFAULT; | |
1da177e4 | 1851 | |
6cb153ca | 1852 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1853 | if (!sock) |
1854 | goto out; | |
1855 | ||
1856 | err = -EMSGSIZE; | |
1857 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1858 | goto out_put; | |
89bddce5 SH |
1859 | |
1860 | /* Check whether to allocate the iovec area */ | |
1da177e4 LT |
1861 | err = -ENOMEM; |
1862 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1863 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1864 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1865 | if (!iov) | |
1866 | goto out_put; | |
1867 | } | |
1868 | ||
1869 | /* | |
89bddce5 SH |
1870 | * Save the user-mode address (verify_iovec will change the |
1871 | * kernel msghdr to use the kernel address space) | |
1da177e4 | 1872 | */ |
89bddce5 SH |
1873 | |
1874 | uaddr = (void __user *)msg_sys.msg_name; | |
1da177e4 LT |
1875 | uaddr_len = COMPAT_NAMELEN(msg); |
1876 | if (MSG_CMSG_COMPAT & flags) { | |
1877 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1878 | } else | |
1879 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1880 | if (err < 0) | |
1881 | goto out_freeiov; | |
89bddce5 | 1882 | total_len = err; |
1da177e4 LT |
1883 | |
1884 | cmsg_ptr = (unsigned long)msg_sys.msg_control; | |
1885 | msg_sys.msg_flags = 0; | |
1886 | if (MSG_CMSG_COMPAT & flags) | |
1887 | msg_sys.msg_flags = MSG_CMSG_COMPAT; | |
89bddce5 | 1888 | |
1da177e4 LT |
1889 | if (sock->file->f_flags & O_NONBLOCK) |
1890 | flags |= MSG_DONTWAIT; | |
1891 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); | |
1892 | if (err < 0) | |
1893 | goto out_freeiov; | |
1894 | len = err; | |
1895 | ||
1896 | if (uaddr != NULL) { | |
89bddce5 SH |
1897 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, |
1898 | uaddr_len); | |
1da177e4 LT |
1899 | if (err < 0) |
1900 | goto out_freeiov; | |
1901 | } | |
37f7f421 DM |
1902 | err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), |
1903 | COMPAT_FLAGS(msg)); | |
1da177e4 LT |
1904 | if (err) |
1905 | goto out_freeiov; | |
1906 | if (MSG_CMSG_COMPAT & flags) | |
89bddce5 | 1907 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1908 | &msg_compat->msg_controllen); |
1909 | else | |
89bddce5 | 1910 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1911 | &msg->msg_controllen); |
1912 | if (err) | |
1913 | goto out_freeiov; | |
1914 | err = len; | |
1915 | ||
1916 | out_freeiov: | |
1917 | if (iov != iovstack) | |
1918 | sock_kfree_s(sock->sk, iov, iov_size); | |
1919 | out_put: | |
6cb153ca | 1920 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1921 | out: |
1922 | return err; | |
1923 | } | |
1924 | ||
1925 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
1926 | ||
1927 | /* Argument list sizes for sys_socketcall */ | |
1928 | #define AL(x) ((x) * sizeof(unsigned long)) | |
89bddce5 SH |
1929 | static const unsigned char nargs[18]={ |
1930 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), | |
1931 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), | |
1932 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) | |
1933 | }; | |
1934 | ||
1da177e4 LT |
1935 | #undef AL |
1936 | ||
1937 | /* | |
89bddce5 | 1938 | * System call vectors. |
1da177e4 LT |
1939 | * |
1940 | * Argument checking cleaned up. Saved 20% in size. | |
1941 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 1942 | * it is set by the callees. |
1da177e4 LT |
1943 | */ |
1944 | ||
1945 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) | |
1946 | { | |
1947 | unsigned long a[6]; | |
89bddce5 | 1948 | unsigned long a0, a1; |
1da177e4 LT |
1949 | int err; |
1950 | ||
89bddce5 | 1951 | if (call < 1 || call > SYS_RECVMSG) |
1da177e4 LT |
1952 | return -EINVAL; |
1953 | ||
1954 | /* copy_from_user should be SMP safe. */ | |
1955 | if (copy_from_user(a, args, nargs[call])) | |
1956 | return -EFAULT; | |
3ec3b2fb | 1957 | |
89bddce5 | 1958 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
3ec3b2fb DW |
1959 | if (err) |
1960 | return err; | |
1961 | ||
89bddce5 SH |
1962 | a0 = a[0]; |
1963 | a1 = a[1]; | |
1964 | ||
1965 | switch (call) { | |
1966 | case SYS_SOCKET: | |
1967 | err = sys_socket(a0, a1, a[2]); | |
1968 | break; | |
1969 | case SYS_BIND: | |
1970 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
1971 | break; | |
1972 | case SYS_CONNECT: | |
1973 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
1974 | break; | |
1975 | case SYS_LISTEN: | |
1976 | err = sys_listen(a0, a1); | |
1977 | break; | |
1978 | case SYS_ACCEPT: | |
1979 | err = | |
1980 | sys_accept(a0, (struct sockaddr __user *)a1, | |
1981 | (int __user *)a[2]); | |
1982 | break; | |
1983 | case SYS_GETSOCKNAME: | |
1984 | err = | |
1985 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
1986 | (int __user *)a[2]); | |
1987 | break; | |
1988 | case SYS_GETPEERNAME: | |
1989 | err = | |
1990 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
1991 | (int __user *)a[2]); | |
1992 | break; | |
1993 | case SYS_SOCKETPAIR: | |
1994 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
1995 | break; | |
1996 | case SYS_SEND: | |
1997 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
1998 | break; | |
1999 | case SYS_SENDTO: | |
2000 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2001 | (struct sockaddr __user *)a[4], a[5]); | |
2002 | break; | |
2003 | case SYS_RECV: | |
2004 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2005 | break; | |
2006 | case SYS_RECVFROM: | |
2007 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2008 | (struct sockaddr __user *)a[4], | |
2009 | (int __user *)a[5]); | |
2010 | break; | |
2011 | case SYS_SHUTDOWN: | |
2012 | err = sys_shutdown(a0, a1); | |
2013 | break; | |
2014 | case SYS_SETSOCKOPT: | |
2015 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2016 | break; | |
2017 | case SYS_GETSOCKOPT: | |
2018 | err = | |
2019 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2020 | (int __user *)a[4]); | |
2021 | break; | |
2022 | case SYS_SENDMSG: | |
2023 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2024 | break; | |
2025 | case SYS_RECVMSG: | |
2026 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2027 | break; | |
2028 | default: | |
2029 | err = -EINVAL; | |
2030 | break; | |
1da177e4 LT |
2031 | } |
2032 | return err; | |
2033 | } | |
2034 | ||
89bddce5 | 2035 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2036 | |
55737fda SH |
2037 | /** |
2038 | * sock_register - add a socket protocol handler | |
2039 | * @ops: description of protocol | |
2040 | * | |
1da177e4 LT |
2041 | * This function is called by a protocol handler that wants to |
2042 | * advertise its address family, and have it linked into the | |
55737fda SH |
2043 | * socket interface. The value ops->family coresponds to the |
2044 | * socket system call protocol family. | |
1da177e4 | 2045 | */ |
f0fd27d4 | 2046 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2047 | { |
2048 | int err; | |
2049 | ||
2050 | if (ops->family >= NPROTO) { | |
89bddce5 SH |
2051 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
2052 | NPROTO); | |
1da177e4 LT |
2053 | return -ENOBUFS; |
2054 | } | |
55737fda SH |
2055 | |
2056 | spin_lock(&net_family_lock); | |
2057 | if (net_families[ops->family]) | |
2058 | err = -EEXIST; | |
2059 | else { | |
89bddce5 | 2060 | net_families[ops->family] = ops; |
1da177e4 LT |
2061 | err = 0; |
2062 | } | |
55737fda SH |
2063 | spin_unlock(&net_family_lock); |
2064 | ||
89bddce5 | 2065 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
2066 | return err; |
2067 | } | |
2068 | ||
55737fda SH |
2069 | /** |
2070 | * sock_unregister - remove a protocol handler | |
2071 | * @family: protocol family to remove | |
2072 | * | |
1da177e4 LT |
2073 | * This function is called by a protocol handler that wants to |
2074 | * remove its address family, and have it unlinked from the | |
55737fda SH |
2075 | * new socket creation. |
2076 | * | |
2077 | * If protocol handler is a module, then it can use module reference | |
2078 | * counts to protect against new references. If protocol handler is not | |
2079 | * a module then it needs to provide its own protection in | |
2080 | * the ops->create routine. | |
1da177e4 | 2081 | */ |
f0fd27d4 | 2082 | void sock_unregister(int family) |
1da177e4 | 2083 | { |
f0fd27d4 | 2084 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 2085 | |
55737fda | 2086 | spin_lock(&net_family_lock); |
89bddce5 | 2087 | net_families[family] = NULL; |
55737fda SH |
2088 | spin_unlock(&net_family_lock); |
2089 | ||
2090 | synchronize_rcu(); | |
2091 | ||
89bddce5 | 2092 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
1da177e4 LT |
2093 | } |
2094 | ||
77d76ea3 | 2095 | static int __init sock_init(void) |
1da177e4 LT |
2096 | { |
2097 | /* | |
89bddce5 | 2098 | * Initialize sock SLAB cache. |
1da177e4 | 2099 | */ |
89bddce5 | 2100 | |
1da177e4 LT |
2101 | sk_init(); |
2102 | ||
1da177e4 | 2103 | /* |
89bddce5 | 2104 | * Initialize skbuff SLAB cache |
1da177e4 LT |
2105 | */ |
2106 | skb_init(); | |
1da177e4 LT |
2107 | |
2108 | /* | |
89bddce5 | 2109 | * Initialize the protocols module. |
1da177e4 LT |
2110 | */ |
2111 | ||
2112 | init_inodecache(); | |
2113 | register_filesystem(&sock_fs_type); | |
2114 | sock_mnt = kern_mount(&sock_fs_type); | |
77d76ea3 AK |
2115 | |
2116 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
2117 | */ |
2118 | ||
2119 | #ifdef CONFIG_NETFILTER | |
2120 | netfilter_init(); | |
2121 | #endif | |
cbeb321a DM |
2122 | |
2123 | return 0; | |
1da177e4 LT |
2124 | } |
2125 | ||
77d76ea3 AK |
2126 | core_initcall(sock_init); /* early initcall */ |
2127 | ||
1da177e4 LT |
2128 | #ifdef CONFIG_PROC_FS |
2129 | void socket_seq_show(struct seq_file *seq) | |
2130 | { | |
2131 | int cpu; | |
2132 | int counter = 0; | |
2133 | ||
6f912042 | 2134 | for_each_possible_cpu(cpu) |
89bddce5 | 2135 | counter += per_cpu(sockets_in_use, cpu); |
1da177e4 LT |
2136 | |
2137 | /* It can be negative, by the way. 8) */ | |
2138 | if (counter < 0) | |
2139 | counter = 0; | |
2140 | ||
2141 | seq_printf(seq, "sockets: used %d\n", counter); | |
2142 | } | |
89bddce5 | 2143 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 2144 | |
89bbfc95 SP |
2145 | #ifdef CONFIG_COMPAT |
2146 | static long compat_sock_ioctl(struct file *file, unsigned cmd, | |
89bddce5 | 2147 | unsigned long arg) |
89bbfc95 SP |
2148 | { |
2149 | struct socket *sock = file->private_data; | |
2150 | int ret = -ENOIOCTLCMD; | |
2151 | ||
2152 | if (sock->ops->compat_ioctl) | |
2153 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
2154 | ||
2155 | return ret; | |
2156 | } | |
2157 | #endif | |
2158 | ||
ac5a488e SS |
2159 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
2160 | { | |
2161 | return sock->ops->bind(sock, addr, addrlen); | |
2162 | } | |
2163 | ||
2164 | int kernel_listen(struct socket *sock, int backlog) | |
2165 | { | |
2166 | return sock->ops->listen(sock, backlog); | |
2167 | } | |
2168 | ||
2169 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
2170 | { | |
2171 | struct sock *sk = sock->sk; | |
2172 | int err; | |
2173 | ||
2174 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
2175 | newsock); | |
2176 | if (err < 0) | |
2177 | goto done; | |
2178 | ||
2179 | err = sock->ops->accept(sock, *newsock, flags); | |
2180 | if (err < 0) { | |
2181 | sock_release(*newsock); | |
2182 | goto done; | |
2183 | } | |
2184 | ||
2185 | (*newsock)->ops = sock->ops; | |
2186 | ||
2187 | done: | |
2188 | return err; | |
2189 | } | |
2190 | ||
2191 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
2192 | int flags) | |
2193 | { | |
2194 | return sock->ops->connect(sock, addr, addrlen, flags); | |
2195 | } | |
2196 | ||
2197 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
2198 | int *addrlen) | |
2199 | { | |
2200 | return sock->ops->getname(sock, addr, addrlen, 0); | |
2201 | } | |
2202 | ||
2203 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
2204 | int *addrlen) | |
2205 | { | |
2206 | return sock->ops->getname(sock, addr, addrlen, 1); | |
2207 | } | |
2208 | ||
2209 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
2210 | char *optval, int *optlen) | |
2211 | { | |
2212 | mm_segment_t oldfs = get_fs(); | |
2213 | int err; | |
2214 | ||
2215 | set_fs(KERNEL_DS); | |
2216 | if (level == SOL_SOCKET) | |
2217 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
2218 | else | |
2219 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
2220 | optlen); | |
2221 | set_fs(oldfs); | |
2222 | return err; | |
2223 | } | |
2224 | ||
2225 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
2226 | char *optval, int optlen) | |
2227 | { | |
2228 | mm_segment_t oldfs = get_fs(); | |
2229 | int err; | |
2230 | ||
2231 | set_fs(KERNEL_DS); | |
2232 | if (level == SOL_SOCKET) | |
2233 | err = sock_setsockopt(sock, level, optname, optval, optlen); | |
2234 | else | |
2235 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
2236 | optlen); | |
2237 | set_fs(oldfs); | |
2238 | return err; | |
2239 | } | |
2240 | ||
2241 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
2242 | size_t size, int flags) | |
2243 | { | |
2244 | if (sock->ops->sendpage) | |
2245 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
2246 | ||
2247 | return sock_no_sendpage(sock, page, offset, size, flags); | |
2248 | } | |
2249 | ||
2250 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
2251 | { | |
2252 | mm_segment_t oldfs = get_fs(); | |
2253 | int err; | |
2254 | ||
2255 | set_fs(KERNEL_DS); | |
2256 | err = sock->ops->ioctl(sock, cmd, arg); | |
2257 | set_fs(oldfs); | |
2258 | ||
2259 | return err; | |
2260 | } | |
2261 | ||
1da177e4 LT |
2262 | /* ABI emulation layers need these two */ |
2263 | EXPORT_SYMBOL(move_addr_to_kernel); | |
2264 | EXPORT_SYMBOL(move_addr_to_user); | |
2265 | EXPORT_SYMBOL(sock_create); | |
2266 | EXPORT_SYMBOL(sock_create_kern); | |
2267 | EXPORT_SYMBOL(sock_create_lite); | |
2268 | EXPORT_SYMBOL(sock_map_fd); | |
2269 | EXPORT_SYMBOL(sock_recvmsg); | |
2270 | EXPORT_SYMBOL(sock_register); | |
2271 | EXPORT_SYMBOL(sock_release); | |
2272 | EXPORT_SYMBOL(sock_sendmsg); | |
2273 | EXPORT_SYMBOL(sock_unregister); | |
2274 | EXPORT_SYMBOL(sock_wake_async); | |
2275 | EXPORT_SYMBOL(sockfd_lookup); | |
2276 | EXPORT_SYMBOL(kernel_sendmsg); | |
2277 | EXPORT_SYMBOL(kernel_recvmsg); | |
ac5a488e SS |
2278 | EXPORT_SYMBOL(kernel_bind); |
2279 | EXPORT_SYMBOL(kernel_listen); | |
2280 | EXPORT_SYMBOL(kernel_accept); | |
2281 | EXPORT_SYMBOL(kernel_connect); | |
2282 | EXPORT_SYMBOL(kernel_getsockname); | |
2283 | EXPORT_SYMBOL(kernel_getpeername); | |
2284 | EXPORT_SYMBOL(kernel_getsockopt); | |
2285 | EXPORT_SYMBOL(kernel_setsockopt); | |
2286 | EXPORT_SYMBOL(kernel_sendpage); | |
2287 | EXPORT_SYMBOL(kernel_sock_ioctl); |