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 | ||
89bddce5 | 588 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
589 | struct msghdr *msg, size_t size, int flags) |
590 | { | |
591 | int err; | |
592 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
593 | ||
594 | si->sock = sock; | |
595 | si->scm = NULL; | |
596 | si->msg = msg; | |
597 | si->size = size; | |
598 | si->flags = flags; | |
599 | ||
600 | err = security_socket_recvmsg(sock, msg, size, flags); | |
601 | if (err) | |
602 | return err; | |
603 | ||
604 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); | |
605 | } | |
606 | ||
89bddce5 | 607 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1da177e4 LT |
608 | size_t size, int flags) |
609 | { | |
610 | struct kiocb iocb; | |
611 | struct sock_iocb siocb; | |
612 | int ret; | |
613 | ||
89bddce5 | 614 | init_sync_kiocb(&iocb, NULL); |
1da177e4 LT |
615 | iocb.private = &siocb; |
616 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); | |
617 | if (-EIOCBQUEUED == ret) | |
618 | ret = wait_on_sync_kiocb(&iocb); | |
619 | return ret; | |
620 | } | |
621 | ||
89bddce5 SH |
622 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
623 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 LT |
624 | { |
625 | mm_segment_t oldfs = get_fs(); | |
626 | int result; | |
627 | ||
628 | set_fs(KERNEL_DS); | |
629 | /* | |
630 | * the following is safe, since for compiler definitions of kvec and | |
631 | * iovec are identical, yielding the same in-core layout and alignment | |
632 | */ | |
89bddce5 | 633 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
1da177e4 LT |
634 | result = sock_recvmsg(sock, msg, size, flags); |
635 | set_fs(oldfs); | |
636 | return result; | |
637 | } | |
638 | ||
639 | static void sock_aio_dtor(struct kiocb *iocb) | |
640 | { | |
641 | kfree(iocb->private); | |
642 | } | |
643 | ||
ce1d4d3e CH |
644 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
645 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 646 | { |
1da177e4 LT |
647 | struct socket *sock; |
648 | int flags; | |
649 | ||
ce1d4d3e CH |
650 | sock = file->private_data; |
651 | ||
652 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
653 | if (more) | |
654 | flags |= MSG_MORE; | |
655 | ||
656 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
657 | } | |
1da177e4 | 658 | |
ce1d4d3e | 659 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
89bddce5 | 660 | struct sock_iocb *siocb) |
ce1d4d3e CH |
661 | { |
662 | if (!is_sync_kiocb(iocb)) { | |
663 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); | |
664 | if (!siocb) | |
665 | return NULL; | |
1da177e4 LT |
666 | iocb->ki_dtor = sock_aio_dtor; |
667 | } | |
1da177e4 | 668 | |
ce1d4d3e | 669 | siocb->kiocb = iocb; |
ce1d4d3e CH |
670 | iocb->private = siocb; |
671 | return siocb; | |
1da177e4 LT |
672 | } |
673 | ||
ce1d4d3e | 674 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
675 | struct file *file, const struct iovec *iov, |
676 | unsigned long nr_segs) | |
ce1d4d3e CH |
677 | { |
678 | struct socket *sock = file->private_data; | |
679 | size_t size = 0; | |
680 | int i; | |
1da177e4 | 681 | |
89bddce5 SH |
682 | for (i = 0; i < nr_segs; i++) |
683 | size += iov[i].iov_len; | |
1da177e4 | 684 | |
ce1d4d3e CH |
685 | msg->msg_name = NULL; |
686 | msg->msg_namelen = 0; | |
687 | msg->msg_control = NULL; | |
688 | msg->msg_controllen = 0; | |
89bddce5 | 689 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
690 | msg->msg_iovlen = nr_segs; |
691 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
692 | ||
693 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); | |
694 | } | |
695 | ||
027445c3 BP |
696 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
697 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
698 | { |
699 | struct sock_iocb siocb, *x; | |
700 | ||
1da177e4 LT |
701 | if (pos != 0) |
702 | return -ESPIPE; | |
027445c3 BP |
703 | |
704 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
1da177e4 LT |
705 | return 0; |
706 | ||
027445c3 BP |
707 | |
708 | x = alloc_sock_iocb(iocb, &siocb); | |
ce1d4d3e CH |
709 | if (!x) |
710 | return -ENOMEM; | |
027445c3 | 711 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
712 | } |
713 | ||
ce1d4d3e | 714 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
715 | struct file *file, const struct iovec *iov, |
716 | unsigned long nr_segs) | |
1da177e4 | 717 | { |
ce1d4d3e CH |
718 | struct socket *sock = file->private_data; |
719 | size_t size = 0; | |
720 | int i; | |
1da177e4 | 721 | |
89bddce5 SH |
722 | for (i = 0; i < nr_segs; i++) |
723 | size += iov[i].iov_len; | |
1da177e4 | 724 | |
ce1d4d3e CH |
725 | msg->msg_name = NULL; |
726 | msg->msg_namelen = 0; | |
727 | msg->msg_control = NULL; | |
728 | msg->msg_controllen = 0; | |
89bddce5 | 729 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
730 | msg->msg_iovlen = nr_segs; |
731 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
732 | if (sock->type == SOCK_SEQPACKET) | |
733 | msg->msg_flags |= MSG_EOR; | |
1da177e4 | 734 | |
ce1d4d3e | 735 | return __sock_sendmsg(iocb, sock, msg, size); |
1da177e4 LT |
736 | } |
737 | ||
027445c3 BP |
738 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
739 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
740 | { |
741 | struct sock_iocb siocb, *x; | |
1da177e4 | 742 | |
ce1d4d3e CH |
743 | if (pos != 0) |
744 | return -ESPIPE; | |
027445c3 BP |
745 | |
746 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
ce1d4d3e | 747 | return 0; |
1da177e4 | 748 | |
027445c3 | 749 | x = alloc_sock_iocb(iocb, &siocb); |
ce1d4d3e CH |
750 | if (!x) |
751 | return -ENOMEM; | |
1da177e4 | 752 | |
027445c3 | 753 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
754 | } |
755 | ||
1da177e4 LT |
756 | /* |
757 | * Atomic setting of ioctl hooks to avoid race | |
758 | * with module unload. | |
759 | */ | |
760 | ||
4a3e2f71 | 761 | static DEFINE_MUTEX(br_ioctl_mutex); |
89bddce5 | 762 | static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL; |
1da177e4 | 763 | |
89bddce5 | 764 | void brioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 765 | { |
4a3e2f71 | 766 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 767 | br_ioctl_hook = hook; |
4a3e2f71 | 768 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 | 769 | } |
89bddce5 | 770 | |
1da177e4 LT |
771 | EXPORT_SYMBOL(brioctl_set); |
772 | ||
4a3e2f71 | 773 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
89bddce5 | 774 | static int (*vlan_ioctl_hook) (void __user *arg); |
1da177e4 | 775 | |
89bddce5 | 776 | void vlan_ioctl_set(int (*hook) (void __user *)) |
1da177e4 | 777 | { |
4a3e2f71 | 778 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 779 | vlan_ioctl_hook = hook; |
4a3e2f71 | 780 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 781 | } |
89bddce5 | 782 | |
1da177e4 LT |
783 | EXPORT_SYMBOL(vlan_ioctl_set); |
784 | ||
4a3e2f71 | 785 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
89bddce5 | 786 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1da177e4 | 787 | |
89bddce5 | 788 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 789 | { |
4a3e2f71 | 790 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 791 | dlci_ioctl_hook = hook; |
4a3e2f71 | 792 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 | 793 | } |
89bddce5 | 794 | |
1da177e4 LT |
795 | EXPORT_SYMBOL(dlci_ioctl_set); |
796 | ||
797 | /* | |
798 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
799 | * what to do with it - that's up to the protocol still. | |
800 | */ | |
801 | ||
802 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
803 | { | |
804 | struct socket *sock; | |
805 | void __user *argp = (void __user *)arg; | |
806 | int pid, err; | |
807 | ||
b69aee04 | 808 | sock = file->private_data; |
1da177e4 LT |
809 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
810 | err = dev_ioctl(cmd, argp); | |
811 | } else | |
d86b5e0e | 812 | #ifdef CONFIG_WIRELESS_EXT |
1da177e4 LT |
813 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
814 | err = dev_ioctl(cmd, argp); | |
815 | } else | |
89bddce5 SH |
816 | #endif /* CONFIG_WIRELESS_EXT */ |
817 | switch (cmd) { | |
1da177e4 LT |
818 | case FIOSETOWN: |
819 | case SIOCSPGRP: | |
820 | err = -EFAULT; | |
821 | if (get_user(pid, (int __user *)argp)) | |
822 | break; | |
823 | err = f_setown(sock->file, pid, 1); | |
824 | break; | |
825 | case FIOGETOWN: | |
826 | case SIOCGPGRP: | |
609d7fa9 | 827 | err = put_user(f_getown(sock->file), |
89bddce5 | 828 | (int __user *)argp); |
1da177e4 LT |
829 | break; |
830 | case SIOCGIFBR: | |
831 | case SIOCSIFBR: | |
832 | case SIOCBRADDBR: | |
833 | case SIOCBRDELBR: | |
834 | err = -ENOPKG; | |
835 | if (!br_ioctl_hook) | |
836 | request_module("bridge"); | |
837 | ||
4a3e2f71 | 838 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 839 | if (br_ioctl_hook) |
1da177e4 | 840 | err = br_ioctl_hook(cmd, argp); |
4a3e2f71 | 841 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
842 | break; |
843 | case SIOCGIFVLAN: | |
844 | case SIOCSIFVLAN: | |
845 | err = -ENOPKG; | |
846 | if (!vlan_ioctl_hook) | |
847 | request_module("8021q"); | |
848 | ||
4a3e2f71 | 849 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 LT |
850 | if (vlan_ioctl_hook) |
851 | err = vlan_ioctl_hook(argp); | |
4a3e2f71 | 852 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 853 | break; |
1da177e4 LT |
854 | case SIOCADDDLCI: |
855 | case SIOCDELDLCI: | |
856 | err = -ENOPKG; | |
857 | if (!dlci_ioctl_hook) | |
858 | request_module("dlci"); | |
859 | ||
860 | if (dlci_ioctl_hook) { | |
4a3e2f71 | 861 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 862 | err = dlci_ioctl_hook(cmd, argp); |
4a3e2f71 | 863 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 LT |
864 | } |
865 | break; | |
866 | default: | |
867 | err = sock->ops->ioctl(sock, cmd, arg); | |
b5e5fa5e CH |
868 | |
869 | /* | |
870 | * If this ioctl is unknown try to hand it down | |
871 | * to the NIC driver. | |
872 | */ | |
873 | if (err == -ENOIOCTLCMD) | |
874 | err = dev_ioctl(cmd, argp); | |
1da177e4 | 875 | break; |
89bddce5 | 876 | } |
1da177e4 LT |
877 | return err; |
878 | } | |
879 | ||
880 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
881 | { | |
882 | int err; | |
883 | struct socket *sock = NULL; | |
89bddce5 | 884 | |
1da177e4 LT |
885 | err = security_socket_create(family, type, protocol, 1); |
886 | if (err) | |
887 | goto out; | |
888 | ||
889 | sock = sock_alloc(); | |
890 | if (!sock) { | |
891 | err = -ENOMEM; | |
892 | goto out; | |
893 | } | |
894 | ||
1da177e4 | 895 | sock->type = type; |
7420ed23 VY |
896 | err = security_socket_post_create(sock, family, type, protocol, 1); |
897 | if (err) | |
898 | goto out_release; | |
899 | ||
1da177e4 LT |
900 | out: |
901 | *res = sock; | |
902 | return err; | |
7420ed23 VY |
903 | out_release: |
904 | sock_release(sock); | |
905 | sock = NULL; | |
906 | goto out; | |
1da177e4 LT |
907 | } |
908 | ||
909 | /* No kernel lock held - perfect */ | |
89bddce5 | 910 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
911 | { |
912 | struct socket *sock; | |
913 | ||
914 | /* | |
89bddce5 | 915 | * We can't return errors to poll, so it's either yes or no. |
1da177e4 | 916 | */ |
b69aee04 | 917 | sock = file->private_data; |
1da177e4 LT |
918 | return sock->ops->poll(file, sock, wait); |
919 | } | |
920 | ||
89bddce5 | 921 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 922 | { |
b69aee04 | 923 | struct socket *sock = file->private_data; |
1da177e4 LT |
924 | |
925 | return sock->ops->mmap(file, sock, vma); | |
926 | } | |
927 | ||
20380731 | 928 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
929 | { |
930 | /* | |
89bddce5 SH |
931 | * It was possible the inode is NULL we were |
932 | * closing an unfinished socket. | |
1da177e4 LT |
933 | */ |
934 | ||
89bddce5 | 935 | if (!inode) { |
1da177e4 LT |
936 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
937 | return 0; | |
938 | } | |
939 | sock_fasync(-1, filp, 0); | |
940 | sock_release(SOCKET_I(inode)); | |
941 | return 0; | |
942 | } | |
943 | ||
944 | /* | |
945 | * Update the socket async list | |
946 | * | |
947 | * Fasync_list locking strategy. | |
948 | * | |
949 | * 1. fasync_list is modified only under process context socket lock | |
950 | * i.e. under semaphore. | |
951 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
952 | * or under socket lock. | |
953 | * 3. fasync_list can be used from softirq context, so that | |
954 | * modification under socket lock have to be enhanced with | |
955 | * write_lock_bh(&sk->sk_callback_lock). | |
956 | * --ANK (990710) | |
957 | */ | |
958 | ||
959 | static int sock_fasync(int fd, struct file *filp, int on) | |
960 | { | |
89bddce5 | 961 | struct fasync_struct *fa, *fna = NULL, **prev; |
1da177e4 LT |
962 | struct socket *sock; |
963 | struct sock *sk; | |
964 | ||
89bddce5 | 965 | if (on) { |
8b3a7005 | 966 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
89bddce5 | 967 | if (fna == NULL) |
1da177e4 LT |
968 | return -ENOMEM; |
969 | } | |
970 | ||
b69aee04 | 971 | sock = filp->private_data; |
1da177e4 | 972 | |
89bddce5 SH |
973 | sk = sock->sk; |
974 | if (sk == NULL) { | |
1da177e4 LT |
975 | kfree(fna); |
976 | return -EINVAL; | |
977 | } | |
978 | ||
979 | lock_sock(sk); | |
980 | ||
89bddce5 | 981 | prev = &(sock->fasync_list); |
1da177e4 | 982 | |
89bddce5 SH |
983 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) |
984 | if (fa->fa_file == filp) | |
1da177e4 LT |
985 | break; |
986 | ||
89bddce5 SH |
987 | if (on) { |
988 | if (fa != NULL) { | |
1da177e4 | 989 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 990 | fa->fa_fd = fd; |
1da177e4 LT |
991 | write_unlock_bh(&sk->sk_callback_lock); |
992 | ||
993 | kfree(fna); | |
994 | goto out; | |
995 | } | |
89bddce5 SH |
996 | fna->fa_file = filp; |
997 | fna->fa_fd = fd; | |
998 | fna->magic = FASYNC_MAGIC; | |
999 | fna->fa_next = sock->fasync_list; | |
1da177e4 | 1000 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1001 | sock->fasync_list = fna; |
1da177e4 | 1002 | write_unlock_bh(&sk->sk_callback_lock); |
89bddce5 SH |
1003 | } else { |
1004 | if (fa != NULL) { | |
1da177e4 | 1005 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1006 | *prev = fa->fa_next; |
1da177e4 LT |
1007 | write_unlock_bh(&sk->sk_callback_lock); |
1008 | kfree(fa); | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | out: | |
1013 | release_sock(sock->sk); | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | /* This function may be called only under socket lock or callback_lock */ | |
1018 | ||
1019 | int sock_wake_async(struct socket *sock, int how, int band) | |
1020 | { | |
1021 | if (!sock || !sock->fasync_list) | |
1022 | return -1; | |
89bddce5 | 1023 | switch (how) { |
1da177e4 | 1024 | case 1: |
89bddce5 | 1025 | |
1da177e4 LT |
1026 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1027 | break; | |
1028 | goto call_kill; | |
1029 | case 2: | |
1030 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) | |
1031 | break; | |
1032 | /* fall through */ | |
1033 | case 0: | |
89bddce5 | 1034 | call_kill: |
1da177e4 LT |
1035 | __kill_fasync(sock->fasync_list, SIGIO, band); |
1036 | break; | |
1037 | case 3: | |
1038 | __kill_fasync(sock->fasync_list, SIGURG, band); | |
1039 | } | |
1040 | return 0; | |
1041 | } | |
1042 | ||
89bddce5 SH |
1043 | static int __sock_create(int family, int type, int protocol, |
1044 | struct socket **res, int kern) | |
1da177e4 LT |
1045 | { |
1046 | int err; | |
1047 | struct socket *sock; | |
55737fda | 1048 | const struct net_proto_family *pf; |
1da177e4 LT |
1049 | |
1050 | /* | |
89bddce5 | 1051 | * Check protocol is in range |
1da177e4 LT |
1052 | */ |
1053 | if (family < 0 || family >= NPROTO) | |
1054 | return -EAFNOSUPPORT; | |
1055 | if (type < 0 || type >= SOCK_MAX) | |
1056 | return -EINVAL; | |
1057 | ||
1058 | /* Compatibility. | |
1059 | ||
1060 | This uglymoron is moved from INET layer to here to avoid | |
1061 | deadlock in module load. | |
1062 | */ | |
1063 | if (family == PF_INET && type == SOCK_PACKET) { | |
89bddce5 | 1064 | static int warned; |
1da177e4 LT |
1065 | if (!warned) { |
1066 | warned = 1; | |
89bddce5 SH |
1067 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1068 | current->comm); | |
1da177e4 LT |
1069 | } |
1070 | family = PF_PACKET; | |
1071 | } | |
1072 | ||
1073 | err = security_socket_create(family, type, protocol, kern); | |
1074 | if (err) | |
1075 | return err; | |
89bddce5 | 1076 | |
55737fda SH |
1077 | /* |
1078 | * Allocate the socket and allow the family to set things up. if | |
1079 | * the protocol is 0, the family is instructed to select an appropriate | |
1080 | * default. | |
1081 | */ | |
1082 | sock = sock_alloc(); | |
1083 | if (!sock) { | |
1084 | if (net_ratelimit()) | |
1085 | printk(KERN_WARNING "socket: no more sockets\n"); | |
1086 | return -ENFILE; /* Not exactly a match, but its the | |
1087 | closest posix thing */ | |
1088 | } | |
1089 | ||
1090 | sock->type = type; | |
1091 | ||
1da177e4 | 1092 | #if defined(CONFIG_KMOD) |
89bddce5 SH |
1093 | /* Attempt to load a protocol module if the find failed. |
1094 | * | |
1095 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1096 | * requested real, full-featured networking support upon configuration. |
1097 | * Otherwise module support will break! | |
1098 | */ | |
55737fda | 1099 | if (net_families[family] == NULL) |
89bddce5 | 1100 | request_module("net-pf-%d", family); |
1da177e4 LT |
1101 | #endif |
1102 | ||
55737fda SH |
1103 | rcu_read_lock(); |
1104 | pf = rcu_dereference(net_families[family]); | |
1105 | err = -EAFNOSUPPORT; | |
1106 | if (!pf) | |
1107 | goto out_release; | |
1da177e4 LT |
1108 | |
1109 | /* | |
1110 | * We will call the ->create function, that possibly is in a loadable | |
1111 | * module, so we have to bump that loadable module refcnt first. | |
1112 | */ | |
55737fda | 1113 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1114 | goto out_release; |
1115 | ||
55737fda SH |
1116 | /* Now protected by module ref count */ |
1117 | rcu_read_unlock(); | |
1118 | ||
1119 | err = pf->create(sock, protocol); | |
1120 | if (err < 0) | |
1da177e4 | 1121 | goto out_module_put; |
a79af59e | 1122 | |
1da177e4 LT |
1123 | /* |
1124 | * Now to bump the refcnt of the [loadable] module that owns this | |
1125 | * socket at sock_release time we decrement its refcnt. | |
1126 | */ | |
55737fda SH |
1127 | if (!try_module_get(sock->ops->owner)) |
1128 | goto out_module_busy; | |
1129 | ||
1da177e4 LT |
1130 | /* |
1131 | * Now that we're done with the ->create function, the [loadable] | |
1132 | * module can have its refcnt decremented | |
1133 | */ | |
55737fda | 1134 | module_put(pf->owner); |
7420ed23 VY |
1135 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1136 | if (err) | |
1137 | goto out_release; | |
55737fda | 1138 | *res = sock; |
1da177e4 | 1139 | |
55737fda SH |
1140 | return 0; |
1141 | ||
1142 | out_module_busy: | |
1143 | err = -EAFNOSUPPORT; | |
1da177e4 | 1144 | out_module_put: |
55737fda SH |
1145 | sock->ops = NULL; |
1146 | module_put(pf->owner); | |
1147 | out_sock_release: | |
1da177e4 | 1148 | sock_release(sock); |
55737fda SH |
1149 | return err; |
1150 | ||
1151 | out_release: | |
1152 | rcu_read_unlock(); | |
1153 | goto out_sock_release; | |
1da177e4 LT |
1154 | } |
1155 | ||
1156 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1157 | { | |
1158 | return __sock_create(family, type, protocol, res, 0); | |
1159 | } | |
1160 | ||
1161 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1162 | { | |
1163 | return __sock_create(family, type, protocol, res, 1); | |
1164 | } | |
1165 | ||
1166 | asmlinkage long sys_socket(int family, int type, int protocol) | |
1167 | { | |
1168 | int retval; | |
1169 | struct socket *sock; | |
1170 | ||
1171 | retval = sock_create(family, type, protocol, &sock); | |
1172 | if (retval < 0) | |
1173 | goto out; | |
1174 | ||
1175 | retval = sock_map_fd(sock); | |
1176 | if (retval < 0) | |
1177 | goto out_release; | |
1178 | ||
1179 | out: | |
1180 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1181 | return retval; | |
1182 | ||
1183 | out_release: | |
1184 | sock_release(sock); | |
1185 | return retval; | |
1186 | } | |
1187 | ||
1188 | /* | |
1189 | * Create a pair of connected sockets. | |
1190 | */ | |
1191 | ||
89bddce5 SH |
1192 | asmlinkage long sys_socketpair(int family, int type, int protocol, |
1193 | int __user *usockvec) | |
1da177e4 LT |
1194 | { |
1195 | struct socket *sock1, *sock2; | |
1196 | int fd1, fd2, err; | |
db349509 | 1197 | struct file *newfile1, *newfile2; |
1da177e4 LT |
1198 | |
1199 | /* | |
1200 | * Obtain the first socket and check if the underlying protocol | |
1201 | * supports the socketpair call. | |
1202 | */ | |
1203 | ||
1204 | err = sock_create(family, type, protocol, &sock1); | |
1205 | if (err < 0) | |
1206 | goto out; | |
1207 | ||
1208 | err = sock_create(family, type, protocol, &sock2); | |
1209 | if (err < 0) | |
1210 | goto out_release_1; | |
1211 | ||
1212 | err = sock1->ops->socketpair(sock1, sock2); | |
89bddce5 | 1213 | if (err < 0) |
1da177e4 LT |
1214 | goto out_release_both; |
1215 | ||
db349509 AV |
1216 | fd1 = sock_alloc_fd(&newfile1); |
1217 | if (unlikely(fd1 < 0)) | |
1218 | goto out_release_both; | |
1da177e4 | 1219 | |
db349509 AV |
1220 | fd2 = sock_alloc_fd(&newfile2); |
1221 | if (unlikely(fd2 < 0)) { | |
1222 | put_filp(newfile1); | |
1223 | put_unused_fd(fd1); | |
1da177e4 | 1224 | goto out_release_both; |
db349509 | 1225 | } |
1da177e4 | 1226 | |
db349509 AV |
1227 | err = sock_attach_fd(sock1, newfile1); |
1228 | if (unlikely(err < 0)) { | |
1229 | goto out_fd2; | |
1230 | } | |
1231 | ||
1232 | err = sock_attach_fd(sock2, newfile2); | |
1233 | if (unlikely(err < 0)) { | |
1234 | fput(newfile1); | |
1235 | goto out_fd1; | |
1236 | } | |
1237 | ||
1238 | err = audit_fd_pair(fd1, fd2); | |
1239 | if (err < 0) { | |
1240 | fput(newfile1); | |
1241 | fput(newfile2); | |
1242 | goto out_fd; | |
1243 | } | |
1da177e4 | 1244 | |
db349509 AV |
1245 | fd_install(fd1, newfile1); |
1246 | fd_install(fd2, newfile2); | |
1da177e4 LT |
1247 | /* fd1 and fd2 may be already another descriptors. |
1248 | * Not kernel problem. | |
1249 | */ | |
1250 | ||
89bddce5 | 1251 | err = put_user(fd1, &usockvec[0]); |
1da177e4 LT |
1252 | if (!err) |
1253 | err = put_user(fd2, &usockvec[1]); | |
1254 | if (!err) | |
1255 | return 0; | |
1256 | ||
1257 | sys_close(fd2); | |
1258 | sys_close(fd1); | |
1259 | return err; | |
1260 | ||
1da177e4 | 1261 | out_release_both: |
89bddce5 | 1262 | sock_release(sock2); |
1da177e4 | 1263 | out_release_1: |
89bddce5 | 1264 | sock_release(sock1); |
1da177e4 LT |
1265 | out: |
1266 | return err; | |
db349509 AV |
1267 | |
1268 | out_fd2: | |
1269 | put_filp(newfile1); | |
1270 | sock_release(sock1); | |
1271 | out_fd1: | |
1272 | put_filp(newfile2); | |
1273 | sock_release(sock2); | |
1274 | out_fd: | |
1275 | put_unused_fd(fd1); | |
1276 | put_unused_fd(fd2); | |
1277 | goto out; | |
1da177e4 LT |
1278 | } |
1279 | ||
1da177e4 LT |
1280 | /* |
1281 | * Bind a name to a socket. Nothing much to do here since it's | |
1282 | * the protocol's responsibility to handle the local address. | |
1283 | * | |
1284 | * We move the socket address to kernel space before we call | |
1285 | * the protocol layer (having also checked the address is ok). | |
1286 | */ | |
1287 | ||
1288 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) | |
1289 | { | |
1290 | struct socket *sock; | |
1291 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1292 | int err, fput_needed; |
1da177e4 | 1293 | |
89bddce5 SH |
1294 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1295 | if(sock) { | |
1296 | err = move_addr_to_kernel(umyaddr, addrlen, address); | |
1297 | if (err >= 0) { | |
1298 | err = security_socket_bind(sock, | |
1299 | (struct sockaddr *)address, | |
1300 | addrlen); | |
6cb153ca BL |
1301 | if (!err) |
1302 | err = sock->ops->bind(sock, | |
89bddce5 SH |
1303 | (struct sockaddr *) |
1304 | address, addrlen); | |
1da177e4 | 1305 | } |
6cb153ca | 1306 | fput_light(sock->file, fput_needed); |
89bddce5 | 1307 | } |
1da177e4 LT |
1308 | return err; |
1309 | } | |
1310 | ||
1da177e4 LT |
1311 | /* |
1312 | * Perform a listen. Basically, we allow the protocol to do anything | |
1313 | * necessary for a listen, and if that works, we mark the socket as | |
1314 | * ready for listening. | |
1315 | */ | |
1316 | ||
7a42c217 | 1317 | int sysctl_somaxconn __read_mostly = SOMAXCONN; |
1da177e4 LT |
1318 | |
1319 | asmlinkage long sys_listen(int fd, int backlog) | |
1320 | { | |
1321 | struct socket *sock; | |
6cb153ca | 1322 | int err, fput_needed; |
89bddce5 SH |
1323 | |
1324 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1325 | if (sock) { | |
1326 | if ((unsigned)backlog > sysctl_somaxconn) | |
1da177e4 LT |
1327 | backlog = sysctl_somaxconn; |
1328 | ||
1329 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1330 | if (!err) |
1331 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1332 | |
6cb153ca | 1333 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1334 | } |
1335 | return err; | |
1336 | } | |
1337 | ||
1da177e4 LT |
1338 | /* |
1339 | * For accept, we attempt to create a new socket, set up the link | |
1340 | * with the client, wake up the client, then return the new | |
1341 | * connected fd. We collect the address of the connector in kernel | |
1342 | * space and move it to user at the very end. This is unclean because | |
1343 | * we open the socket then return an error. | |
1344 | * | |
1345 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1346 | * status to recvmsg. We need to add that support in a way thats | |
1347 | * clean when we restucture accept also. | |
1348 | */ | |
1349 | ||
89bddce5 SH |
1350 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, |
1351 | int __user *upeer_addrlen) | |
1da177e4 LT |
1352 | { |
1353 | struct socket *sock, *newsock; | |
39d8c1b6 | 1354 | struct file *newfile; |
6cb153ca | 1355 | int err, len, newfd, fput_needed; |
1da177e4 LT |
1356 | char address[MAX_SOCK_ADDR]; |
1357 | ||
6cb153ca | 1358 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1359 | if (!sock) |
1360 | goto out; | |
1361 | ||
1362 | err = -ENFILE; | |
89bddce5 | 1363 | if (!(newsock = sock_alloc())) |
1da177e4 LT |
1364 | goto out_put; |
1365 | ||
1366 | newsock->type = sock->type; | |
1367 | newsock->ops = sock->ops; | |
1368 | ||
1da177e4 LT |
1369 | /* |
1370 | * We don't need try_module_get here, as the listening socket (sock) | |
1371 | * has the protocol module (sock->ops->owner) held. | |
1372 | */ | |
1373 | __module_get(newsock->ops->owner); | |
1374 | ||
39d8c1b6 DM |
1375 | newfd = sock_alloc_fd(&newfile); |
1376 | if (unlikely(newfd < 0)) { | |
1377 | err = newfd; | |
9a1875e6 DM |
1378 | sock_release(newsock); |
1379 | goto out_put; | |
39d8c1b6 DM |
1380 | } |
1381 | ||
1382 | err = sock_attach_fd(newsock, newfile); | |
1383 | if (err < 0) | |
1384 | goto out_fd; | |
1385 | ||
a79af59e FF |
1386 | err = security_socket_accept(sock, newsock); |
1387 | if (err) | |
39d8c1b6 | 1388 | goto out_fd; |
a79af59e | 1389 | |
1da177e4 LT |
1390 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1391 | if (err < 0) | |
39d8c1b6 | 1392 | goto out_fd; |
1da177e4 LT |
1393 | |
1394 | if (upeer_sockaddr) { | |
89bddce5 SH |
1395 | if (newsock->ops->getname(newsock, (struct sockaddr *)address, |
1396 | &len, 2) < 0) { | |
1da177e4 | 1397 | err = -ECONNABORTED; |
39d8c1b6 | 1398 | goto out_fd; |
1da177e4 | 1399 | } |
89bddce5 SH |
1400 | err = move_addr_to_user(address, len, upeer_sockaddr, |
1401 | upeer_addrlen); | |
1da177e4 | 1402 | if (err < 0) |
39d8c1b6 | 1403 | goto out_fd; |
1da177e4 LT |
1404 | } |
1405 | ||
1406 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1407 | ||
39d8c1b6 DM |
1408 | fd_install(newfd, newfile); |
1409 | err = newfd; | |
1da177e4 LT |
1410 | |
1411 | security_socket_post_accept(sock, newsock); | |
1412 | ||
1413 | out_put: | |
6cb153ca | 1414 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1415 | out: |
1416 | return err; | |
39d8c1b6 | 1417 | out_fd: |
9606a216 | 1418 | fput(newfile); |
39d8c1b6 | 1419 | put_unused_fd(newfd); |
1da177e4 LT |
1420 | goto out_put; |
1421 | } | |
1422 | ||
1da177e4 LT |
1423 | /* |
1424 | * Attempt to connect to a socket with the server address. The address | |
1425 | * is in user space so we verify it is OK and move it to kernel space. | |
1426 | * | |
1427 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1428 | * break bindings | |
1429 | * | |
1430 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1431 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1432 | * include the -EINPROGRESS status for such sockets. | |
1433 | */ | |
1434 | ||
89bddce5 SH |
1435 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, |
1436 | int addrlen) | |
1da177e4 LT |
1437 | { |
1438 | struct socket *sock; | |
1439 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1440 | int err, fput_needed; |
1da177e4 | 1441 | |
6cb153ca | 1442 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1443 | if (!sock) |
1444 | goto out; | |
1445 | err = move_addr_to_kernel(uservaddr, addrlen, address); | |
1446 | if (err < 0) | |
1447 | goto out_put; | |
1448 | ||
89bddce5 SH |
1449 | err = |
1450 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); | |
1da177e4 LT |
1451 | if (err) |
1452 | goto out_put; | |
1453 | ||
89bddce5 | 1454 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
1da177e4 LT |
1455 | sock->file->f_flags); |
1456 | out_put: | |
6cb153ca | 1457 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1458 | out: |
1459 | return err; | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * Get the local address ('name') of a socket object. Move the obtained | |
1464 | * name to user space. | |
1465 | */ | |
1466 | ||
89bddce5 SH |
1467 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1468 | int __user *usockaddr_len) | |
1da177e4 LT |
1469 | { |
1470 | struct socket *sock; | |
1471 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1472 | int len, err, fput_needed; |
89bddce5 | 1473 | |
6cb153ca | 1474 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1475 | if (!sock) |
1476 | goto out; | |
1477 | ||
1478 | err = security_socket_getsockname(sock); | |
1479 | if (err) | |
1480 | goto out_put; | |
1481 | ||
1482 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); | |
1483 | if (err) | |
1484 | goto out_put; | |
1485 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); | |
1486 | ||
1487 | out_put: | |
6cb153ca | 1488 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1489 | out: |
1490 | return err; | |
1491 | } | |
1492 | ||
1493 | /* | |
1494 | * Get the remote address ('name') of a socket object. Move the obtained | |
1495 | * name to user space. | |
1496 | */ | |
1497 | ||
89bddce5 SH |
1498 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1499 | int __user *usockaddr_len) | |
1da177e4 LT |
1500 | { |
1501 | struct socket *sock; | |
1502 | char address[MAX_SOCK_ADDR]; | |
6cb153ca | 1503 | int len, err, fput_needed; |
1da177e4 | 1504 | |
89bddce5 SH |
1505 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1506 | if (sock != NULL) { | |
1da177e4 LT |
1507 | err = security_socket_getpeername(sock); |
1508 | if (err) { | |
6cb153ca | 1509 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1510 | return err; |
1511 | } | |
1512 | ||
89bddce5 SH |
1513 | err = |
1514 | sock->ops->getname(sock, (struct sockaddr *)address, &len, | |
1515 | 1); | |
1da177e4 | 1516 | if (!err) |
89bddce5 SH |
1517 | err = move_addr_to_user(address, len, usockaddr, |
1518 | usockaddr_len); | |
6cb153ca | 1519 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1520 | } |
1521 | return err; | |
1522 | } | |
1523 | ||
1524 | /* | |
1525 | * Send a datagram to a given address. We move the address into kernel | |
1526 | * space and check the user space data area is readable before invoking | |
1527 | * the protocol. | |
1528 | */ | |
1529 | ||
89bddce5 SH |
1530 | asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, |
1531 | unsigned flags, struct sockaddr __user *addr, | |
1532 | int addr_len) | |
1da177e4 LT |
1533 | { |
1534 | struct socket *sock; | |
1535 | char address[MAX_SOCK_ADDR]; | |
1536 | int err; | |
1537 | struct msghdr msg; | |
1538 | struct iovec iov; | |
6cb153ca BL |
1539 | int fput_needed; |
1540 | struct file *sock_file; | |
1541 | ||
1542 | sock_file = fget_light(fd, &fput_needed); | |
4387ff75 | 1543 | err = -EBADF; |
6cb153ca | 1544 | if (!sock_file) |
4387ff75 | 1545 | goto out; |
6cb153ca BL |
1546 | |
1547 | sock = sock_from_file(sock_file, &err); | |
1da177e4 | 1548 | if (!sock) |
6cb153ca | 1549 | goto out_put; |
89bddce5 SH |
1550 | iov.iov_base = buff; |
1551 | iov.iov_len = len; | |
1552 | msg.msg_name = NULL; | |
1553 | msg.msg_iov = &iov; | |
1554 | msg.msg_iovlen = 1; | |
1555 | msg.msg_control = NULL; | |
1556 | msg.msg_controllen = 0; | |
1557 | msg.msg_namelen = 0; | |
6cb153ca | 1558 | if (addr) { |
1da177e4 LT |
1559 | err = move_addr_to_kernel(addr, addr_len, address); |
1560 | if (err < 0) | |
1561 | goto out_put; | |
89bddce5 SH |
1562 | msg.msg_name = address; |
1563 | msg.msg_namelen = addr_len; | |
1da177e4 LT |
1564 | } |
1565 | if (sock->file->f_flags & O_NONBLOCK) | |
1566 | flags |= MSG_DONTWAIT; | |
1567 | msg.msg_flags = flags; | |
1568 | err = sock_sendmsg(sock, &msg, len); | |
1569 | ||
89bddce5 | 1570 | out_put: |
6cb153ca | 1571 | fput_light(sock_file, fput_needed); |
4387ff75 | 1572 | out: |
1da177e4 LT |
1573 | return err; |
1574 | } | |
1575 | ||
1576 | /* | |
89bddce5 | 1577 | * Send a datagram down a socket. |
1da177e4 LT |
1578 | */ |
1579 | ||
89bddce5 | 1580 | asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) |
1da177e4 LT |
1581 | { |
1582 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1583 | } | |
1584 | ||
1585 | /* | |
89bddce5 | 1586 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
1587 | * sender. We verify the buffers are writable and if needed move the |
1588 | * sender address from kernel to user space. | |
1589 | */ | |
1590 | ||
89bddce5 SH |
1591 | asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, |
1592 | unsigned flags, struct sockaddr __user *addr, | |
1593 | int __user *addr_len) | |
1da177e4 LT |
1594 | { |
1595 | struct socket *sock; | |
1596 | struct iovec iov; | |
1597 | struct msghdr msg; | |
1598 | char address[MAX_SOCK_ADDR]; | |
89bddce5 | 1599 | int err, err2; |
6cb153ca BL |
1600 | struct file *sock_file; |
1601 | int fput_needed; | |
1602 | ||
1603 | sock_file = fget_light(fd, &fput_needed); | |
4387ff75 | 1604 | err = -EBADF; |
6cb153ca | 1605 | if (!sock_file) |
4387ff75 | 1606 | goto out; |
1da177e4 | 1607 | |
6cb153ca | 1608 | sock = sock_from_file(sock_file, &err); |
1da177e4 | 1609 | if (!sock) |
4387ff75 | 1610 | goto out_put; |
1da177e4 | 1611 | |
89bddce5 SH |
1612 | msg.msg_control = NULL; |
1613 | msg.msg_controllen = 0; | |
1614 | msg.msg_iovlen = 1; | |
1615 | msg.msg_iov = &iov; | |
1616 | iov.iov_len = size; | |
1617 | iov.iov_base = ubuf; | |
1618 | msg.msg_name = address; | |
1619 | msg.msg_namelen = MAX_SOCK_ADDR; | |
1da177e4 LT |
1620 | if (sock->file->f_flags & O_NONBLOCK) |
1621 | flags |= MSG_DONTWAIT; | |
89bddce5 | 1622 | err = sock_recvmsg(sock, &msg, size, flags); |
1da177e4 | 1623 | |
89bddce5 SH |
1624 | if (err >= 0 && addr != NULL) { |
1625 | err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); | |
1626 | if (err2 < 0) | |
1627 | err = err2; | |
1da177e4 | 1628 | } |
4387ff75 | 1629 | out_put: |
6cb153ca | 1630 | fput_light(sock_file, fput_needed); |
4387ff75 | 1631 | out: |
1da177e4 LT |
1632 | return err; |
1633 | } | |
1634 | ||
1635 | /* | |
89bddce5 | 1636 | * Receive a datagram from a socket. |
1da177e4 LT |
1637 | */ |
1638 | ||
89bddce5 SH |
1639 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
1640 | unsigned flags) | |
1da177e4 LT |
1641 | { |
1642 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1643 | } | |
1644 | ||
1645 | /* | |
1646 | * Set a socket option. Because we don't know the option lengths we have | |
1647 | * to pass the user mode parameter for the protocols to sort out. | |
1648 | */ | |
1649 | ||
89bddce5 SH |
1650 | asmlinkage long sys_setsockopt(int fd, int level, int optname, |
1651 | char __user *optval, int optlen) | |
1da177e4 | 1652 | { |
6cb153ca | 1653 | int err, fput_needed; |
1da177e4 LT |
1654 | struct socket *sock; |
1655 | ||
1656 | if (optlen < 0) | |
1657 | return -EINVAL; | |
89bddce5 SH |
1658 | |
1659 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1660 | if (sock != NULL) { | |
1661 | err = security_socket_setsockopt(sock, level, optname); | |
6cb153ca BL |
1662 | if (err) |
1663 | goto out_put; | |
1da177e4 LT |
1664 | |
1665 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1666 | err = |
1667 | sock_setsockopt(sock, level, optname, optval, | |
1668 | optlen); | |
1da177e4 | 1669 | else |
89bddce5 SH |
1670 | err = |
1671 | sock->ops->setsockopt(sock, level, optname, optval, | |
1672 | optlen); | |
6cb153ca BL |
1673 | out_put: |
1674 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1675 | } |
1676 | return err; | |
1677 | } | |
1678 | ||
1679 | /* | |
1680 | * Get a socket option. Because we don't know the option lengths we have | |
1681 | * to pass a user mode parameter for the protocols to sort out. | |
1682 | */ | |
1683 | ||
89bddce5 SH |
1684 | asmlinkage long sys_getsockopt(int fd, int level, int optname, |
1685 | char __user *optval, int __user *optlen) | |
1da177e4 | 1686 | { |
6cb153ca | 1687 | int err, fput_needed; |
1da177e4 LT |
1688 | struct socket *sock; |
1689 | ||
89bddce5 SH |
1690 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1691 | if (sock != NULL) { | |
6cb153ca BL |
1692 | err = security_socket_getsockopt(sock, level, optname); |
1693 | if (err) | |
1694 | goto out_put; | |
1da177e4 LT |
1695 | |
1696 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1697 | err = |
1698 | sock_getsockopt(sock, level, optname, optval, | |
1699 | optlen); | |
1da177e4 | 1700 | else |
89bddce5 SH |
1701 | err = |
1702 | sock->ops->getsockopt(sock, level, optname, optval, | |
1703 | optlen); | |
6cb153ca BL |
1704 | out_put: |
1705 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1706 | } |
1707 | return err; | |
1708 | } | |
1709 | ||
1da177e4 LT |
1710 | /* |
1711 | * Shutdown a socket. | |
1712 | */ | |
1713 | ||
1714 | asmlinkage long sys_shutdown(int fd, int how) | |
1715 | { | |
6cb153ca | 1716 | int err, fput_needed; |
1da177e4 LT |
1717 | struct socket *sock; |
1718 | ||
89bddce5 SH |
1719 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1720 | if (sock != NULL) { | |
1da177e4 | 1721 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
1722 | if (!err) |
1723 | err = sock->ops->shutdown(sock, how); | |
1724 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1725 | } |
1726 | return err; | |
1727 | } | |
1728 | ||
89bddce5 | 1729 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
1730 | * fields which are the same type (int / unsigned) on our platforms. |
1731 | */ | |
1732 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1733 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1734 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1735 | ||
1da177e4 LT |
1736 | /* |
1737 | * BSD sendmsg interface | |
1738 | */ | |
1739 | ||
1740 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
1741 | { | |
89bddce5 SH |
1742 | struct compat_msghdr __user *msg_compat = |
1743 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1744 | struct socket *sock; |
1745 | char address[MAX_SOCK_ADDR]; | |
1746 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
b9d717a7 | 1747 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
89bddce5 SH |
1748 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
1749 | /* 20 is size of ipv6_pktinfo */ | |
1da177e4 LT |
1750 | unsigned char *ctl_buf = ctl; |
1751 | struct msghdr msg_sys; | |
1752 | int err, ctl_len, iov_size, total_len; | |
6cb153ca | 1753 | int fput_needed; |
89bddce5 | 1754 | |
1da177e4 LT |
1755 | err = -EFAULT; |
1756 | if (MSG_CMSG_COMPAT & flags) { | |
1757 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1758 | return -EFAULT; | |
89bddce5 SH |
1759 | } |
1760 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1da177e4 LT |
1761 | return -EFAULT; |
1762 | ||
6cb153ca | 1763 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
89bddce5 | 1764 | if (!sock) |
1da177e4 LT |
1765 | goto out; |
1766 | ||
1767 | /* do not move before msg_sys is valid */ | |
1768 | err = -EMSGSIZE; | |
1769 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1770 | goto out_put; | |
1771 | ||
89bddce5 | 1772 | /* Check whether to allocate the iovec area */ |
1da177e4 LT |
1773 | err = -ENOMEM; |
1774 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1775 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1776 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1777 | if (!iov) | |
1778 | goto out_put; | |
1779 | } | |
1780 | ||
1781 | /* This will also move the address data into kernel space */ | |
1782 | if (MSG_CMSG_COMPAT & flags) { | |
1783 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); | |
1784 | } else | |
1785 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); | |
89bddce5 | 1786 | if (err < 0) |
1da177e4 LT |
1787 | goto out_freeiov; |
1788 | total_len = err; | |
1789 | ||
1790 | err = -ENOBUFS; | |
1791 | ||
1792 | if (msg_sys.msg_controllen > INT_MAX) | |
1793 | goto out_freeiov; | |
89bddce5 | 1794 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1795 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 SH |
1796 | err = |
1797 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, | |
1798 | sizeof(ctl)); | |
1da177e4 LT |
1799 | if (err) |
1800 | goto out_freeiov; | |
1801 | ctl_buf = msg_sys.msg_control; | |
8920e8f9 | 1802 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1803 | } else if (ctl_len) { |
89bddce5 | 1804 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 1805 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 1806 | if (ctl_buf == NULL) |
1da177e4 LT |
1807 | goto out_freeiov; |
1808 | } | |
1809 | err = -EFAULT; | |
1810 | /* | |
1811 | * Careful! Before this, msg_sys.msg_control contains a user pointer. | |
1812 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1813 | * checking falls down on this. | |
1814 | */ | |
89bddce5 SH |
1815 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, |
1816 | ctl_len)) | |
1da177e4 LT |
1817 | goto out_freectl; |
1818 | msg_sys.msg_control = ctl_buf; | |
1819 | } | |
1820 | msg_sys.msg_flags = flags; | |
1821 | ||
1822 | if (sock->file->f_flags & O_NONBLOCK) | |
1823 | msg_sys.msg_flags |= MSG_DONTWAIT; | |
1824 | err = sock_sendmsg(sock, &msg_sys, total_len); | |
1825 | ||
1826 | out_freectl: | |
89bddce5 | 1827 | if (ctl_buf != ctl) |
1da177e4 LT |
1828 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
1829 | out_freeiov: | |
1830 | if (iov != iovstack) | |
1831 | sock_kfree_s(sock->sk, iov, iov_size); | |
1832 | out_put: | |
6cb153ca | 1833 | fput_light(sock->file, fput_needed); |
89bddce5 | 1834 | out: |
1da177e4 LT |
1835 | return err; |
1836 | } | |
1837 | ||
1838 | /* | |
1839 | * BSD recvmsg interface | |
1840 | */ | |
1841 | ||
89bddce5 SH |
1842 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, |
1843 | unsigned int flags) | |
1da177e4 | 1844 | { |
89bddce5 SH |
1845 | struct compat_msghdr __user *msg_compat = |
1846 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1847 | struct socket *sock; |
1848 | struct iovec iovstack[UIO_FASTIOV]; | |
89bddce5 | 1849 | struct iovec *iov = iovstack; |
1da177e4 LT |
1850 | struct msghdr msg_sys; |
1851 | unsigned long cmsg_ptr; | |
1852 | int err, iov_size, total_len, len; | |
6cb153ca | 1853 | int fput_needed; |
1da177e4 LT |
1854 | |
1855 | /* kernel mode address */ | |
1856 | char addr[MAX_SOCK_ADDR]; | |
1857 | ||
1858 | /* user mode address pointers */ | |
1859 | struct sockaddr __user *uaddr; | |
1860 | int __user *uaddr_len; | |
89bddce5 | 1861 | |
1da177e4 LT |
1862 | if (MSG_CMSG_COMPAT & flags) { |
1863 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1864 | return -EFAULT; | |
89bddce5 SH |
1865 | } |
1866 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1867 | return -EFAULT; | |
1da177e4 | 1868 | |
6cb153ca | 1869 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1870 | if (!sock) |
1871 | goto out; | |
1872 | ||
1873 | err = -EMSGSIZE; | |
1874 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1875 | goto out_put; | |
89bddce5 SH |
1876 | |
1877 | /* Check whether to allocate the iovec area */ | |
1da177e4 LT |
1878 | err = -ENOMEM; |
1879 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1880 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1881 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1882 | if (!iov) | |
1883 | goto out_put; | |
1884 | } | |
1885 | ||
1886 | /* | |
89bddce5 SH |
1887 | * Save the user-mode address (verify_iovec will change the |
1888 | * kernel msghdr to use the kernel address space) | |
1da177e4 | 1889 | */ |
89bddce5 SH |
1890 | |
1891 | uaddr = (void __user *)msg_sys.msg_name; | |
1da177e4 LT |
1892 | uaddr_len = COMPAT_NAMELEN(msg); |
1893 | if (MSG_CMSG_COMPAT & flags) { | |
1894 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1895 | } else | |
1896 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1897 | if (err < 0) | |
1898 | goto out_freeiov; | |
89bddce5 | 1899 | total_len = err; |
1da177e4 LT |
1900 | |
1901 | cmsg_ptr = (unsigned long)msg_sys.msg_control; | |
1902 | msg_sys.msg_flags = 0; | |
1903 | if (MSG_CMSG_COMPAT & flags) | |
1904 | msg_sys.msg_flags = MSG_CMSG_COMPAT; | |
89bddce5 | 1905 | |
1da177e4 LT |
1906 | if (sock->file->f_flags & O_NONBLOCK) |
1907 | flags |= MSG_DONTWAIT; | |
1908 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); | |
1909 | if (err < 0) | |
1910 | goto out_freeiov; | |
1911 | len = err; | |
1912 | ||
1913 | if (uaddr != NULL) { | |
89bddce5 SH |
1914 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, |
1915 | uaddr_len); | |
1da177e4 LT |
1916 | if (err < 0) |
1917 | goto out_freeiov; | |
1918 | } | |
37f7f421 DM |
1919 | err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), |
1920 | COMPAT_FLAGS(msg)); | |
1da177e4 LT |
1921 | if (err) |
1922 | goto out_freeiov; | |
1923 | if (MSG_CMSG_COMPAT & flags) | |
89bddce5 | 1924 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1925 | &msg_compat->msg_controllen); |
1926 | else | |
89bddce5 | 1927 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
1928 | &msg->msg_controllen); |
1929 | if (err) | |
1930 | goto out_freeiov; | |
1931 | err = len; | |
1932 | ||
1933 | out_freeiov: | |
1934 | if (iov != iovstack) | |
1935 | sock_kfree_s(sock->sk, iov, iov_size); | |
1936 | out_put: | |
6cb153ca | 1937 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1938 | out: |
1939 | return err; | |
1940 | } | |
1941 | ||
1942 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
1943 | ||
1944 | /* Argument list sizes for sys_socketcall */ | |
1945 | #define AL(x) ((x) * sizeof(unsigned long)) | |
89bddce5 SH |
1946 | static const unsigned char nargs[18]={ |
1947 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), | |
1948 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), | |
1949 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) | |
1950 | }; | |
1951 | ||
1da177e4 LT |
1952 | #undef AL |
1953 | ||
1954 | /* | |
89bddce5 | 1955 | * System call vectors. |
1da177e4 LT |
1956 | * |
1957 | * Argument checking cleaned up. Saved 20% in size. | |
1958 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 1959 | * it is set by the callees. |
1da177e4 LT |
1960 | */ |
1961 | ||
1962 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) | |
1963 | { | |
1964 | unsigned long a[6]; | |
89bddce5 | 1965 | unsigned long a0, a1; |
1da177e4 LT |
1966 | int err; |
1967 | ||
89bddce5 | 1968 | if (call < 1 || call > SYS_RECVMSG) |
1da177e4 LT |
1969 | return -EINVAL; |
1970 | ||
1971 | /* copy_from_user should be SMP safe. */ | |
1972 | if (copy_from_user(a, args, nargs[call])) | |
1973 | return -EFAULT; | |
3ec3b2fb | 1974 | |
89bddce5 | 1975 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
3ec3b2fb DW |
1976 | if (err) |
1977 | return err; | |
1978 | ||
89bddce5 SH |
1979 | a0 = a[0]; |
1980 | a1 = a[1]; | |
1981 | ||
1982 | switch (call) { | |
1983 | case SYS_SOCKET: | |
1984 | err = sys_socket(a0, a1, a[2]); | |
1985 | break; | |
1986 | case SYS_BIND: | |
1987 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
1988 | break; | |
1989 | case SYS_CONNECT: | |
1990 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
1991 | break; | |
1992 | case SYS_LISTEN: | |
1993 | err = sys_listen(a0, a1); | |
1994 | break; | |
1995 | case SYS_ACCEPT: | |
1996 | err = | |
1997 | sys_accept(a0, (struct sockaddr __user *)a1, | |
1998 | (int __user *)a[2]); | |
1999 | break; | |
2000 | case SYS_GETSOCKNAME: | |
2001 | err = | |
2002 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2003 | (int __user *)a[2]); | |
2004 | break; | |
2005 | case SYS_GETPEERNAME: | |
2006 | err = | |
2007 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2008 | (int __user *)a[2]); | |
2009 | break; | |
2010 | case SYS_SOCKETPAIR: | |
2011 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2012 | break; | |
2013 | case SYS_SEND: | |
2014 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2015 | break; | |
2016 | case SYS_SENDTO: | |
2017 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2018 | (struct sockaddr __user *)a[4], a[5]); | |
2019 | break; | |
2020 | case SYS_RECV: | |
2021 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2022 | break; | |
2023 | case SYS_RECVFROM: | |
2024 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2025 | (struct sockaddr __user *)a[4], | |
2026 | (int __user *)a[5]); | |
2027 | break; | |
2028 | case SYS_SHUTDOWN: | |
2029 | err = sys_shutdown(a0, a1); | |
2030 | break; | |
2031 | case SYS_SETSOCKOPT: | |
2032 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2033 | break; | |
2034 | case SYS_GETSOCKOPT: | |
2035 | err = | |
2036 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2037 | (int __user *)a[4]); | |
2038 | break; | |
2039 | case SYS_SENDMSG: | |
2040 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2041 | break; | |
2042 | case SYS_RECVMSG: | |
2043 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2044 | break; | |
2045 | default: | |
2046 | err = -EINVAL; | |
2047 | break; | |
1da177e4 LT |
2048 | } |
2049 | return err; | |
2050 | } | |
2051 | ||
89bddce5 | 2052 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2053 | |
55737fda SH |
2054 | /** |
2055 | * sock_register - add a socket protocol handler | |
2056 | * @ops: description of protocol | |
2057 | * | |
1da177e4 LT |
2058 | * This function is called by a protocol handler that wants to |
2059 | * advertise its address family, and have it linked into the | |
55737fda SH |
2060 | * socket interface. The value ops->family coresponds to the |
2061 | * socket system call protocol family. | |
1da177e4 | 2062 | */ |
f0fd27d4 | 2063 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2064 | { |
2065 | int err; | |
2066 | ||
2067 | if (ops->family >= NPROTO) { | |
89bddce5 SH |
2068 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
2069 | NPROTO); | |
1da177e4 LT |
2070 | return -ENOBUFS; |
2071 | } | |
55737fda SH |
2072 | |
2073 | spin_lock(&net_family_lock); | |
2074 | if (net_families[ops->family]) | |
2075 | err = -EEXIST; | |
2076 | else { | |
89bddce5 | 2077 | net_families[ops->family] = ops; |
1da177e4 LT |
2078 | err = 0; |
2079 | } | |
55737fda SH |
2080 | spin_unlock(&net_family_lock); |
2081 | ||
89bddce5 | 2082 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
2083 | return err; |
2084 | } | |
2085 | ||
55737fda SH |
2086 | /** |
2087 | * sock_unregister - remove a protocol handler | |
2088 | * @family: protocol family to remove | |
2089 | * | |
1da177e4 LT |
2090 | * This function is called by a protocol handler that wants to |
2091 | * remove its address family, and have it unlinked from the | |
55737fda SH |
2092 | * new socket creation. |
2093 | * | |
2094 | * If protocol handler is a module, then it can use module reference | |
2095 | * counts to protect against new references. If protocol handler is not | |
2096 | * a module then it needs to provide its own protection in | |
2097 | * the ops->create routine. | |
1da177e4 | 2098 | */ |
f0fd27d4 | 2099 | void sock_unregister(int family) |
1da177e4 | 2100 | { |
f0fd27d4 | 2101 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 2102 | |
55737fda | 2103 | spin_lock(&net_family_lock); |
89bddce5 | 2104 | net_families[family] = NULL; |
55737fda SH |
2105 | spin_unlock(&net_family_lock); |
2106 | ||
2107 | synchronize_rcu(); | |
2108 | ||
89bddce5 | 2109 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
1da177e4 LT |
2110 | } |
2111 | ||
77d76ea3 | 2112 | static int __init sock_init(void) |
1da177e4 LT |
2113 | { |
2114 | /* | |
89bddce5 | 2115 | * Initialize sock SLAB cache. |
1da177e4 | 2116 | */ |
89bddce5 | 2117 | |
1da177e4 LT |
2118 | sk_init(); |
2119 | ||
1da177e4 | 2120 | /* |
89bddce5 | 2121 | * Initialize skbuff SLAB cache |
1da177e4 LT |
2122 | */ |
2123 | skb_init(); | |
1da177e4 LT |
2124 | |
2125 | /* | |
89bddce5 | 2126 | * Initialize the protocols module. |
1da177e4 LT |
2127 | */ |
2128 | ||
2129 | init_inodecache(); | |
2130 | register_filesystem(&sock_fs_type); | |
2131 | sock_mnt = kern_mount(&sock_fs_type); | |
77d76ea3 AK |
2132 | |
2133 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
2134 | */ |
2135 | ||
2136 | #ifdef CONFIG_NETFILTER | |
2137 | netfilter_init(); | |
2138 | #endif | |
cbeb321a DM |
2139 | |
2140 | return 0; | |
1da177e4 LT |
2141 | } |
2142 | ||
77d76ea3 AK |
2143 | core_initcall(sock_init); /* early initcall */ |
2144 | ||
1da177e4 LT |
2145 | #ifdef CONFIG_PROC_FS |
2146 | void socket_seq_show(struct seq_file *seq) | |
2147 | { | |
2148 | int cpu; | |
2149 | int counter = 0; | |
2150 | ||
6f912042 | 2151 | for_each_possible_cpu(cpu) |
89bddce5 | 2152 | counter += per_cpu(sockets_in_use, cpu); |
1da177e4 LT |
2153 | |
2154 | /* It can be negative, by the way. 8) */ | |
2155 | if (counter < 0) | |
2156 | counter = 0; | |
2157 | ||
2158 | seq_printf(seq, "sockets: used %d\n", counter); | |
2159 | } | |
89bddce5 | 2160 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 2161 | |
89bbfc95 SP |
2162 | #ifdef CONFIG_COMPAT |
2163 | static long compat_sock_ioctl(struct file *file, unsigned cmd, | |
89bddce5 | 2164 | unsigned long arg) |
89bbfc95 SP |
2165 | { |
2166 | struct socket *sock = file->private_data; | |
2167 | int ret = -ENOIOCTLCMD; | |
2168 | ||
2169 | if (sock->ops->compat_ioctl) | |
2170 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
2171 | ||
2172 | return ret; | |
2173 | } | |
2174 | #endif | |
2175 | ||
ac5a488e SS |
2176 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
2177 | { | |
2178 | return sock->ops->bind(sock, addr, addrlen); | |
2179 | } | |
2180 | ||
2181 | int kernel_listen(struct socket *sock, int backlog) | |
2182 | { | |
2183 | return sock->ops->listen(sock, backlog); | |
2184 | } | |
2185 | ||
2186 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
2187 | { | |
2188 | struct sock *sk = sock->sk; | |
2189 | int err; | |
2190 | ||
2191 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
2192 | newsock); | |
2193 | if (err < 0) | |
2194 | goto done; | |
2195 | ||
2196 | err = sock->ops->accept(sock, *newsock, flags); | |
2197 | if (err < 0) { | |
2198 | sock_release(*newsock); | |
2199 | goto done; | |
2200 | } | |
2201 | ||
2202 | (*newsock)->ops = sock->ops; | |
2203 | ||
2204 | done: | |
2205 | return err; | |
2206 | } | |
2207 | ||
2208 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
4768fbcb | 2209 | int flags) |
ac5a488e SS |
2210 | { |
2211 | return sock->ops->connect(sock, addr, addrlen, flags); | |
2212 | } | |
2213 | ||
2214 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
2215 | int *addrlen) | |
2216 | { | |
2217 | return sock->ops->getname(sock, addr, addrlen, 0); | |
2218 | } | |
2219 | ||
2220 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
2221 | int *addrlen) | |
2222 | { | |
2223 | return sock->ops->getname(sock, addr, addrlen, 1); | |
2224 | } | |
2225 | ||
2226 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
2227 | char *optval, int *optlen) | |
2228 | { | |
2229 | mm_segment_t oldfs = get_fs(); | |
2230 | int err; | |
2231 | ||
2232 | set_fs(KERNEL_DS); | |
2233 | if (level == SOL_SOCKET) | |
2234 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
2235 | else | |
2236 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
2237 | optlen); | |
2238 | set_fs(oldfs); | |
2239 | return err; | |
2240 | } | |
2241 | ||
2242 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
2243 | char *optval, int optlen) | |
2244 | { | |
2245 | mm_segment_t oldfs = get_fs(); | |
2246 | int err; | |
2247 | ||
2248 | set_fs(KERNEL_DS); | |
2249 | if (level == SOL_SOCKET) | |
2250 | err = sock_setsockopt(sock, level, optname, optval, optlen); | |
2251 | else | |
2252 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
2253 | optlen); | |
2254 | set_fs(oldfs); | |
2255 | return err; | |
2256 | } | |
2257 | ||
2258 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
2259 | size_t size, int flags) | |
2260 | { | |
2261 | if (sock->ops->sendpage) | |
2262 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
2263 | ||
2264 | return sock_no_sendpage(sock, page, offset, size, flags); | |
2265 | } | |
2266 | ||
2267 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
2268 | { | |
2269 | mm_segment_t oldfs = get_fs(); | |
2270 | int err; | |
2271 | ||
2272 | set_fs(KERNEL_DS); | |
2273 | err = sock->ops->ioctl(sock, cmd, arg); | |
2274 | set_fs(oldfs); | |
2275 | ||
2276 | return err; | |
2277 | } | |
2278 | ||
1da177e4 LT |
2279 | /* ABI emulation layers need these two */ |
2280 | EXPORT_SYMBOL(move_addr_to_kernel); | |
2281 | EXPORT_SYMBOL(move_addr_to_user); | |
2282 | EXPORT_SYMBOL(sock_create); | |
2283 | EXPORT_SYMBOL(sock_create_kern); | |
2284 | EXPORT_SYMBOL(sock_create_lite); | |
2285 | EXPORT_SYMBOL(sock_map_fd); | |
2286 | EXPORT_SYMBOL(sock_recvmsg); | |
2287 | EXPORT_SYMBOL(sock_register); | |
2288 | EXPORT_SYMBOL(sock_release); | |
2289 | EXPORT_SYMBOL(sock_sendmsg); | |
2290 | EXPORT_SYMBOL(sock_unregister); | |
2291 | EXPORT_SYMBOL(sock_wake_async); | |
2292 | EXPORT_SYMBOL(sockfd_lookup); | |
2293 | EXPORT_SYMBOL(kernel_sendmsg); | |
2294 | EXPORT_SYMBOL(kernel_recvmsg); | |
ac5a488e SS |
2295 | EXPORT_SYMBOL(kernel_bind); |
2296 | EXPORT_SYMBOL(kernel_listen); | |
2297 | EXPORT_SYMBOL(kernel_accept); | |
2298 | EXPORT_SYMBOL(kernel_connect); | |
2299 | EXPORT_SYMBOL(kernel_getsockname); | |
2300 | EXPORT_SYMBOL(kernel_getpeername); | |
2301 | EXPORT_SYMBOL(kernel_getsockopt); | |
2302 | EXPORT_SYMBOL(kernel_setsockopt); | |
2303 | EXPORT_SYMBOL(kernel_sendpage); | |
2304 | EXPORT_SYMBOL(kernel_sock_ioctl); |