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> | |
aaca0bdc | 66 | #include <linux/thread_info.h> |
55737fda | 67 | #include <linux/rcupdate.h> |
1da177e4 LT |
68 | #include <linux/netdevice.h> |
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
4a3e2f71 | 71 | #include <linux/mutex.h> |
1da177e4 LT |
72 | #include <linux/wanrouter.h> |
73 | #include <linux/if_bridge.h> | |
20380731 ACM |
74 | #include <linux/if_frad.h> |
75 | #include <linux/if_vlan.h> | |
1da177e4 LT |
76 | #include <linux/init.h> |
77 | #include <linux/poll.h> | |
78 | #include <linux/cache.h> | |
79 | #include <linux/module.h> | |
80 | #include <linux/highmem.h> | |
1da177e4 LT |
81 | #include <linux/mount.h> |
82 | #include <linux/security.h> | |
83 | #include <linux/syscalls.h> | |
84 | #include <linux/compat.h> | |
85 | #include <linux/kmod.h> | |
3ec3b2fb | 86 | #include <linux/audit.h> |
d86b5e0e | 87 | #include <linux/wireless.h> |
1b8d7ae4 | 88 | #include <linux/nsproxy.h> |
1da177e4 LT |
89 | |
90 | #include <asm/uaccess.h> | |
91 | #include <asm/unistd.h> | |
92 | ||
93 | #include <net/compat.h> | |
87de87d5 | 94 | #include <net/wext.h> |
1da177e4 LT |
95 | |
96 | #include <net/sock.h> | |
97 | #include <linux/netfilter.h> | |
98 | ||
99 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); | |
027445c3 BP |
100 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
101 | unsigned long nr_segs, loff_t pos); | |
102 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
103 | unsigned long nr_segs, loff_t pos); | |
89bddce5 | 104 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
1da177e4 LT |
105 | |
106 | static int sock_close(struct inode *inode, struct file *file); | |
107 | static unsigned int sock_poll(struct file *file, | |
108 | struct poll_table_struct *wait); | |
89bddce5 | 109 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
89bbfc95 SP |
110 | #ifdef CONFIG_COMPAT |
111 | static long compat_sock_ioctl(struct file *file, | |
89bddce5 | 112 | unsigned int cmd, unsigned long arg); |
89bbfc95 | 113 | #endif |
1da177e4 | 114 | static int sock_fasync(int fd, struct file *filp, int on); |
1da177e4 LT |
115 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
116 | int offset, size_t size, loff_t *ppos, int more); | |
9c55e01c JA |
117 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
118 | struct pipe_inode_info *pipe, size_t len, | |
119 | unsigned int flags); | |
1da177e4 | 120 | |
1da177e4 LT |
121 | /* |
122 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
123 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
124 | */ | |
125 | ||
da7071d7 | 126 | static const struct file_operations socket_file_ops = { |
1da177e4 LT |
127 | .owner = THIS_MODULE, |
128 | .llseek = no_llseek, | |
129 | .aio_read = sock_aio_read, | |
130 | .aio_write = sock_aio_write, | |
131 | .poll = sock_poll, | |
132 | .unlocked_ioctl = sock_ioctl, | |
89bbfc95 SP |
133 | #ifdef CONFIG_COMPAT |
134 | .compat_ioctl = compat_sock_ioctl, | |
135 | #endif | |
1da177e4 LT |
136 | .mmap = sock_mmap, |
137 | .open = sock_no_open, /* special open code to disallow open via /proc */ | |
138 | .release = sock_close, | |
139 | .fasync = sock_fasync, | |
5274f052 JA |
140 | .sendpage = sock_sendpage, |
141 | .splice_write = generic_splice_sendpage, | |
9c55e01c | 142 | .splice_read = sock_splice_read, |
1da177e4 LT |
143 | }; |
144 | ||
145 | /* | |
146 | * The protocol list. Each protocol is registered in here. | |
147 | */ | |
148 | ||
1da177e4 | 149 | static DEFINE_SPINLOCK(net_family_lock); |
f0fd27d4 | 150 | static const struct net_proto_family *net_families[NPROTO] __read_mostly; |
1da177e4 | 151 | |
1da177e4 LT |
152 | /* |
153 | * Statistics counters of the socket lists | |
154 | */ | |
155 | ||
156 | static DEFINE_PER_CPU(int, sockets_in_use) = 0; | |
157 | ||
158 | /* | |
89bddce5 SH |
159 | * Support routines. |
160 | * Move socket addresses back and forth across the kernel/user | |
161 | * divide and look after the messy bits. | |
1da177e4 LT |
162 | */ |
163 | ||
89bddce5 | 164 | #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - |
1da177e4 LT |
165 | 16 for IP, 16 for IPX, |
166 | 24 for IPv6, | |
89bddce5 | 167 | about 80 for AX.25 |
1da177e4 LT |
168 | must be at least one bigger than |
169 | the AF_UNIX size (see net/unix/af_unix.c | |
89bddce5 | 170 | :unix_mkname()). |
1da177e4 | 171 | */ |
89bddce5 | 172 | |
1da177e4 LT |
173 | /** |
174 | * move_addr_to_kernel - copy a socket address into kernel space | |
175 | * @uaddr: Address in user space | |
176 | * @kaddr: Address in kernel space | |
177 | * @ulen: Length in user space | |
178 | * | |
179 | * The address is copied into kernel space. If the provided address is | |
180 | * too long an error code of -EINVAL is returned. If the copy gives | |
181 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
182 | */ | |
183 | ||
230b1839 | 184 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr) |
1da177e4 | 185 | { |
230b1839 | 186 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
1da177e4 | 187 | return -EINVAL; |
89bddce5 | 188 | if (ulen == 0) |
1da177e4 | 189 | return 0; |
89bddce5 | 190 | if (copy_from_user(kaddr, uaddr, ulen)) |
1da177e4 | 191 | return -EFAULT; |
3ec3b2fb | 192 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
193 | } |
194 | ||
195 | /** | |
196 | * move_addr_to_user - copy an address to user space | |
197 | * @kaddr: kernel space address | |
198 | * @klen: length of address in kernel | |
199 | * @uaddr: user space address | |
200 | * @ulen: pointer to user length field | |
201 | * | |
202 | * The value pointed to by ulen on entry is the buffer length available. | |
203 | * This is overwritten with the buffer space used. -EINVAL is returned | |
204 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
205 | * is returned if either the buffer or the length field are not | |
206 | * accessible. | |
207 | * After copying the data up to the limit the user specifies, the true | |
208 | * length of the data is written over the length limit the user | |
209 | * specified. Zero is returned for a success. | |
210 | */ | |
89bddce5 | 211 | |
230b1839 | 212 | int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr, |
89bddce5 | 213 | int __user *ulen) |
1da177e4 LT |
214 | { |
215 | int err; | |
216 | int len; | |
217 | ||
89bddce5 SH |
218 | err = get_user(len, ulen); |
219 | if (err) | |
1da177e4 | 220 | return err; |
89bddce5 SH |
221 | if (len > klen) |
222 | len = klen; | |
230b1839 | 223 | if (len < 0 || len > sizeof(struct sockaddr_storage)) |
1da177e4 | 224 | return -EINVAL; |
89bddce5 | 225 | if (len) { |
d6fe3945 SG |
226 | if (audit_sockaddr(klen, kaddr)) |
227 | return -ENOMEM; | |
89bddce5 | 228 | if (copy_to_user(uaddr, kaddr, len)) |
1da177e4 LT |
229 | return -EFAULT; |
230 | } | |
231 | /* | |
89bddce5 SH |
232 | * "fromlen shall refer to the value before truncation.." |
233 | * 1003.1g | |
1da177e4 LT |
234 | */ |
235 | return __put_user(klen, ulen); | |
236 | } | |
237 | ||
238 | #define SOCKFS_MAGIC 0x534F434B | |
239 | ||
e18b890b | 240 | static struct kmem_cache *sock_inode_cachep __read_mostly; |
1da177e4 LT |
241 | |
242 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
243 | { | |
244 | struct socket_alloc *ei; | |
89bddce5 | 245 | |
e94b1766 | 246 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
247 | if (!ei) |
248 | return NULL; | |
249 | init_waitqueue_head(&ei->socket.wait); | |
89bddce5 | 250 | |
1da177e4 LT |
251 | ei->socket.fasync_list = NULL; |
252 | ei->socket.state = SS_UNCONNECTED; | |
253 | ei->socket.flags = 0; | |
254 | ei->socket.ops = NULL; | |
255 | ei->socket.sk = NULL; | |
256 | ei->socket.file = NULL; | |
1da177e4 LT |
257 | |
258 | return &ei->vfs_inode; | |
259 | } | |
260 | ||
261 | static void sock_destroy_inode(struct inode *inode) | |
262 | { | |
263 | kmem_cache_free(sock_inode_cachep, | |
264 | container_of(inode, struct socket_alloc, vfs_inode)); | |
265 | } | |
266 | ||
51cc5068 | 267 | static void init_once(void *foo) |
1da177e4 | 268 | { |
89bddce5 | 269 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
1da177e4 | 270 | |
a35afb83 | 271 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 272 | } |
89bddce5 | 273 | |
1da177e4 LT |
274 | static int init_inodecache(void) |
275 | { | |
276 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
89bddce5 SH |
277 | sizeof(struct socket_alloc), |
278 | 0, | |
279 | (SLAB_HWCACHE_ALIGN | | |
280 | SLAB_RECLAIM_ACCOUNT | | |
281 | SLAB_MEM_SPREAD), | |
20c2df83 | 282 | init_once); |
1da177e4 LT |
283 | if (sock_inode_cachep == NULL) |
284 | return -ENOMEM; | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static struct super_operations sockfs_ops = { | |
289 | .alloc_inode = sock_alloc_inode, | |
290 | .destroy_inode =sock_destroy_inode, | |
291 | .statfs = simple_statfs, | |
292 | }; | |
293 | ||
454e2398 | 294 | static int sockfs_get_sb(struct file_system_type *fs_type, |
89bddce5 SH |
295 | int flags, const char *dev_name, void *data, |
296 | struct vfsmount *mnt) | |
1da177e4 | 297 | { |
454e2398 DH |
298 | return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, |
299 | mnt); | |
1da177e4 LT |
300 | } |
301 | ||
ba89966c | 302 | static struct vfsmount *sock_mnt __read_mostly; |
1da177e4 LT |
303 | |
304 | static struct file_system_type sock_fs_type = { | |
305 | .name = "sockfs", | |
306 | .get_sb = sockfs_get_sb, | |
307 | .kill_sb = kill_anon_super, | |
308 | }; | |
89bddce5 | 309 | |
1da177e4 LT |
310 | static int sockfs_delete_dentry(struct dentry *dentry) |
311 | { | |
304e61e6 ED |
312 | /* |
313 | * At creation time, we pretended this dentry was hashed | |
314 | * (by clearing DCACHE_UNHASHED bit in d_flags) | |
315 | * At delete time, we restore the truth : not hashed. | |
316 | * (so that dput() can proceed correctly) | |
317 | */ | |
318 | dentry->d_flags |= DCACHE_UNHASHED; | |
319 | return 0; | |
1da177e4 | 320 | } |
c23fbb6b ED |
321 | |
322 | /* | |
323 | * sockfs_dname() is called from d_path(). | |
324 | */ | |
325 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
326 | { | |
327 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
328 | dentry->d_inode->i_ino); | |
329 | } | |
330 | ||
1da177e4 | 331 | static struct dentry_operations sockfs_dentry_operations = { |
89bddce5 | 332 | .d_delete = sockfs_delete_dentry, |
c23fbb6b | 333 | .d_dname = sockfs_dname, |
1da177e4 LT |
334 | }; |
335 | ||
336 | /* | |
337 | * Obtains the first available file descriptor and sets it up for use. | |
338 | * | |
39d8c1b6 DM |
339 | * These functions create file structures and maps them to fd space |
340 | * of the current process. On success it returns file descriptor | |
1da177e4 LT |
341 | * and file struct implicitly stored in sock->file. |
342 | * Note that another thread may close file descriptor before we return | |
343 | * from this function. We use the fact that now we do not refer | |
344 | * to socket after mapping. If one day we will need it, this | |
345 | * function will increment ref. count on file by 1. | |
346 | * | |
347 | * In any case returned fd MAY BE not valid! | |
348 | * This race condition is unavoidable | |
349 | * with shared fd spaces, we cannot solve it inside kernel, | |
350 | * but we take care of internal coherence yet. | |
351 | */ | |
352 | ||
a677a039 | 353 | static int sock_alloc_fd(struct file **filep, int flags) |
1da177e4 LT |
354 | { |
355 | int fd; | |
1da177e4 | 356 | |
a677a039 | 357 | fd = get_unused_fd_flags(flags); |
39d8c1b6 | 358 | if (likely(fd >= 0)) { |
1da177e4 LT |
359 | struct file *file = get_empty_filp(); |
360 | ||
39d8c1b6 DM |
361 | *filep = file; |
362 | if (unlikely(!file)) { | |
1da177e4 | 363 | put_unused_fd(fd); |
39d8c1b6 | 364 | return -ENFILE; |
1da177e4 | 365 | } |
39d8c1b6 DM |
366 | } else |
367 | *filep = NULL; | |
368 | return fd; | |
369 | } | |
1da177e4 | 370 | |
77d27200 | 371 | static int sock_attach_fd(struct socket *sock, struct file *file, int flags) |
39d8c1b6 | 372 | { |
ce8d2cdf | 373 | struct dentry *dentry; |
c23fbb6b | 374 | struct qstr name = { .name = "" }; |
39d8c1b6 | 375 | |
ce8d2cdf DH |
376 | dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name); |
377 | if (unlikely(!dentry)) | |
39d8c1b6 DM |
378 | return -ENOMEM; |
379 | ||
ce8d2cdf | 380 | dentry->d_op = &sockfs_dentry_operations; |
304e61e6 ED |
381 | /* |
382 | * We dont want to push this dentry into global dentry hash table. | |
383 | * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED | |
384 | * This permits a working /proc/$pid/fd/XXX on sockets | |
385 | */ | |
ce8d2cdf DH |
386 | dentry->d_flags &= ~DCACHE_UNHASHED; |
387 | d_instantiate(dentry, SOCK_INODE(sock)); | |
39d8c1b6 DM |
388 | |
389 | sock->file = file; | |
ce8d2cdf DH |
390 | init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE, |
391 | &socket_file_ops); | |
392 | SOCK_INODE(sock)->i_fop = &socket_file_ops; | |
77d27200 | 393 | file->f_flags = O_RDWR | (flags & O_NONBLOCK); |
39d8c1b6 DM |
394 | file->f_pos = 0; |
395 | file->private_data = sock; | |
1da177e4 | 396 | |
39d8c1b6 DM |
397 | return 0; |
398 | } | |
399 | ||
a677a039 | 400 | int sock_map_fd(struct socket *sock, int flags) |
39d8c1b6 DM |
401 | { |
402 | struct file *newfile; | |
a677a039 | 403 | int fd = sock_alloc_fd(&newfile, flags); |
39d8c1b6 DM |
404 | |
405 | if (likely(fd >= 0)) { | |
77d27200 | 406 | int err = sock_attach_fd(sock, newfile, flags); |
39d8c1b6 DM |
407 | |
408 | if (unlikely(err < 0)) { | |
409 | put_filp(newfile); | |
1da177e4 | 410 | put_unused_fd(fd); |
39d8c1b6 | 411 | return err; |
1da177e4 | 412 | } |
39d8c1b6 | 413 | fd_install(fd, newfile); |
1da177e4 | 414 | } |
1da177e4 LT |
415 | return fd; |
416 | } | |
417 | ||
6cb153ca BL |
418 | static struct socket *sock_from_file(struct file *file, int *err) |
419 | { | |
6cb153ca BL |
420 | if (file->f_op == &socket_file_ops) |
421 | return file->private_data; /* set in sock_map_fd */ | |
422 | ||
23bb80d2 ED |
423 | *err = -ENOTSOCK; |
424 | return NULL; | |
6cb153ca BL |
425 | } |
426 | ||
1da177e4 LT |
427 | /** |
428 | * sockfd_lookup - Go from a file number to its socket slot | |
429 | * @fd: file handle | |
430 | * @err: pointer to an error code return | |
431 | * | |
432 | * The file handle passed in is locked and the socket it is bound | |
433 | * too is returned. If an error occurs the err pointer is overwritten | |
434 | * with a negative errno code and NULL is returned. The function checks | |
435 | * for both invalid handles and passing a handle which is not a socket. | |
436 | * | |
437 | * On a success the socket object pointer is returned. | |
438 | */ | |
439 | ||
440 | struct socket *sockfd_lookup(int fd, int *err) | |
441 | { | |
442 | struct file *file; | |
1da177e4 LT |
443 | struct socket *sock; |
444 | ||
89bddce5 SH |
445 | file = fget(fd); |
446 | if (!file) { | |
1da177e4 LT |
447 | *err = -EBADF; |
448 | return NULL; | |
449 | } | |
89bddce5 | 450 | |
6cb153ca BL |
451 | sock = sock_from_file(file, err); |
452 | if (!sock) | |
1da177e4 | 453 | fput(file); |
6cb153ca BL |
454 | return sock; |
455 | } | |
1da177e4 | 456 | |
6cb153ca BL |
457 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
458 | { | |
459 | struct file *file; | |
460 | struct socket *sock; | |
461 | ||
3672558c | 462 | *err = -EBADF; |
6cb153ca BL |
463 | file = fget_light(fd, fput_needed); |
464 | if (file) { | |
465 | sock = sock_from_file(file, err); | |
466 | if (sock) | |
467 | return sock; | |
468 | fput_light(file, *fput_needed); | |
1da177e4 | 469 | } |
6cb153ca | 470 | return NULL; |
1da177e4 LT |
471 | } |
472 | ||
473 | /** | |
474 | * sock_alloc - allocate a socket | |
89bddce5 | 475 | * |
1da177e4 LT |
476 | * Allocate a new inode and socket object. The two are bound together |
477 | * and initialised. The socket is then returned. If we are out of inodes | |
478 | * NULL is returned. | |
479 | */ | |
480 | ||
481 | static struct socket *sock_alloc(void) | |
482 | { | |
89bddce5 SH |
483 | struct inode *inode; |
484 | struct socket *sock; | |
1da177e4 LT |
485 | |
486 | inode = new_inode(sock_mnt->mnt_sb); | |
487 | if (!inode) | |
488 | return NULL; | |
489 | ||
490 | sock = SOCKET_I(inode); | |
491 | ||
89bddce5 | 492 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
8192b0c4 DH |
493 | inode->i_uid = current_fsuid(); |
494 | inode->i_gid = current_fsgid(); | |
1da177e4 LT |
495 | |
496 | get_cpu_var(sockets_in_use)++; | |
497 | put_cpu_var(sockets_in_use); | |
498 | return sock; | |
499 | } | |
500 | ||
501 | /* | |
502 | * In theory you can't get an open on this inode, but /proc provides | |
503 | * a back door. Remember to keep it shut otherwise you'll let the | |
504 | * creepy crawlies in. | |
505 | */ | |
89bddce5 | 506 | |
1da177e4 LT |
507 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
508 | { | |
509 | return -ENXIO; | |
510 | } | |
511 | ||
4b6f5d20 | 512 | const struct file_operations bad_sock_fops = { |
1da177e4 LT |
513 | .owner = THIS_MODULE, |
514 | .open = sock_no_open, | |
515 | }; | |
516 | ||
517 | /** | |
518 | * sock_release - close a socket | |
519 | * @sock: socket to close | |
520 | * | |
521 | * The socket is released from the protocol stack if it has a release | |
522 | * callback, and the inode is then released if the socket is bound to | |
89bddce5 | 523 | * an inode not a file. |
1da177e4 | 524 | */ |
89bddce5 | 525 | |
1da177e4 LT |
526 | void sock_release(struct socket *sock) |
527 | { | |
528 | if (sock->ops) { | |
529 | struct module *owner = sock->ops->owner; | |
530 | ||
531 | sock->ops->release(sock); | |
532 | sock->ops = NULL; | |
533 | module_put(owner); | |
534 | } | |
535 | ||
536 | if (sock->fasync_list) | |
537 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); | |
538 | ||
539 | get_cpu_var(sockets_in_use)--; | |
540 | put_cpu_var(sockets_in_use); | |
541 | if (!sock->file) { | |
542 | iput(SOCK_INODE(sock)); | |
543 | return; | |
544 | } | |
89bddce5 | 545 | sock->file = NULL; |
1da177e4 LT |
546 | } |
547 | ||
89bddce5 | 548 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
549 | struct msghdr *msg, size_t size) |
550 | { | |
551 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
552 | int err; | |
553 | ||
554 | si->sock = sock; | |
555 | si->scm = NULL; | |
556 | si->msg = msg; | |
557 | si->size = size; | |
558 | ||
559 | err = security_socket_sendmsg(sock, msg, size); | |
560 | if (err) | |
561 | return err; | |
562 | ||
563 | return sock->ops->sendmsg(iocb, sock, msg, size); | |
564 | } | |
565 | ||
566 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | |
567 | { | |
568 | struct kiocb iocb; | |
569 | struct sock_iocb siocb; | |
570 | int ret; | |
571 | ||
572 | init_sync_kiocb(&iocb, NULL); | |
573 | iocb.private = &siocb; | |
574 | ret = __sock_sendmsg(&iocb, sock, msg, size); | |
575 | if (-EIOCBQUEUED == ret) | |
576 | ret = wait_on_sync_kiocb(&iocb); | |
577 | return ret; | |
578 | } | |
579 | ||
580 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
581 | struct kvec *vec, size_t num, size_t size) | |
582 | { | |
583 | mm_segment_t oldfs = get_fs(); | |
584 | int result; | |
585 | ||
586 | set_fs(KERNEL_DS); | |
587 | /* | |
588 | * the following is safe, since for compiler definitions of kvec and | |
589 | * iovec are identical, yielding the same in-core layout and alignment | |
590 | */ | |
89bddce5 | 591 | msg->msg_iov = (struct iovec *)vec; |
1da177e4 LT |
592 | msg->msg_iovlen = num; |
593 | result = sock_sendmsg(sock, msg, size); | |
594 | set_fs(oldfs); | |
595 | return result; | |
596 | } | |
597 | ||
92f37fd2 ED |
598 | /* |
599 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
600 | */ | |
601 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
602 | struct sk_buff *skb) | |
603 | { | |
604 | ktime_t kt = skb->tstamp; | |
605 | ||
606 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
607 | struct timeval tv; | |
608 | /* Race occurred between timestamp enabling and packet | |
609 | receiving. Fill in the current time for now. */ | |
610 | if (kt.tv64 == 0) | |
611 | kt = ktime_get_real(); | |
612 | skb->tstamp = kt; | |
613 | tv = ktime_to_timeval(kt); | |
614 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv); | |
615 | } else { | |
616 | struct timespec ts; | |
617 | /* Race occurred between timestamp enabling and packet | |
618 | receiving. Fill in the current time for now. */ | |
619 | if (kt.tv64 == 0) | |
620 | kt = ktime_get_real(); | |
621 | skb->tstamp = kt; | |
622 | ts = ktime_to_timespec(kt); | |
623 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts); | |
624 | } | |
625 | } | |
626 | ||
7c81fd8b ACM |
627 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
628 | ||
89bddce5 | 629 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
630 | struct msghdr *msg, size_t size, int flags) |
631 | { | |
632 | int err; | |
633 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
634 | ||
635 | si->sock = sock; | |
636 | si->scm = NULL; | |
637 | si->msg = msg; | |
638 | si->size = size; | |
639 | si->flags = flags; | |
640 | ||
641 | err = security_socket_recvmsg(sock, msg, size, flags); | |
642 | if (err) | |
643 | return err; | |
644 | ||
645 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); | |
646 | } | |
647 | ||
89bddce5 | 648 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1da177e4 LT |
649 | size_t size, int flags) |
650 | { | |
651 | struct kiocb iocb; | |
652 | struct sock_iocb siocb; | |
653 | int ret; | |
654 | ||
89bddce5 | 655 | init_sync_kiocb(&iocb, NULL); |
1da177e4 LT |
656 | iocb.private = &siocb; |
657 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); | |
658 | if (-EIOCBQUEUED == ret) | |
659 | ret = wait_on_sync_kiocb(&iocb); | |
660 | return ret; | |
661 | } | |
662 | ||
89bddce5 SH |
663 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
664 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 LT |
665 | { |
666 | mm_segment_t oldfs = get_fs(); | |
667 | int result; | |
668 | ||
669 | set_fs(KERNEL_DS); | |
670 | /* | |
671 | * the following is safe, since for compiler definitions of kvec and | |
672 | * iovec are identical, yielding the same in-core layout and alignment | |
673 | */ | |
89bddce5 | 674 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
1da177e4 LT |
675 | result = sock_recvmsg(sock, msg, size, flags); |
676 | set_fs(oldfs); | |
677 | return result; | |
678 | } | |
679 | ||
680 | static void sock_aio_dtor(struct kiocb *iocb) | |
681 | { | |
682 | kfree(iocb->private); | |
683 | } | |
684 | ||
ce1d4d3e CH |
685 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
686 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 687 | { |
1da177e4 LT |
688 | struct socket *sock; |
689 | int flags; | |
690 | ||
ce1d4d3e CH |
691 | sock = file->private_data; |
692 | ||
693 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
694 | if (more) | |
695 | flags |= MSG_MORE; | |
696 | ||
697 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
698 | } | |
1da177e4 | 699 | |
9c55e01c JA |
700 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
701 | struct pipe_inode_info *pipe, size_t len, | |
702 | unsigned int flags) | |
703 | { | |
704 | struct socket *sock = file->private_data; | |
705 | ||
997b37da RDC |
706 | if (unlikely(!sock->ops->splice_read)) |
707 | return -EINVAL; | |
708 | ||
9c55e01c JA |
709 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
710 | } | |
711 | ||
ce1d4d3e | 712 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
89bddce5 | 713 | struct sock_iocb *siocb) |
ce1d4d3e CH |
714 | { |
715 | if (!is_sync_kiocb(iocb)) { | |
716 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); | |
717 | if (!siocb) | |
718 | return NULL; | |
1da177e4 LT |
719 | iocb->ki_dtor = sock_aio_dtor; |
720 | } | |
1da177e4 | 721 | |
ce1d4d3e | 722 | siocb->kiocb = iocb; |
ce1d4d3e CH |
723 | iocb->private = siocb; |
724 | return siocb; | |
1da177e4 LT |
725 | } |
726 | ||
ce1d4d3e | 727 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
728 | struct file *file, const struct iovec *iov, |
729 | unsigned long nr_segs) | |
ce1d4d3e CH |
730 | { |
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 | ||
746 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); | |
747 | } | |
748 | ||
027445c3 BP |
749 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
750 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
751 | { |
752 | struct sock_iocb siocb, *x; | |
753 | ||
1da177e4 LT |
754 | if (pos != 0) |
755 | return -ESPIPE; | |
027445c3 BP |
756 | |
757 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ | |
1da177e4 LT |
758 | return 0; |
759 | ||
027445c3 BP |
760 | |
761 | x = alloc_sock_iocb(iocb, &siocb); | |
ce1d4d3e CH |
762 | if (!x) |
763 | return -ENOMEM; | |
027445c3 | 764 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
765 | } |
766 | ||
ce1d4d3e | 767 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
027445c3 BP |
768 | struct file *file, const struct iovec *iov, |
769 | unsigned long nr_segs) | |
1da177e4 | 770 | { |
ce1d4d3e CH |
771 | struct socket *sock = file->private_data; |
772 | size_t size = 0; | |
773 | int i; | |
1da177e4 | 774 | |
89bddce5 SH |
775 | for (i = 0; i < nr_segs; i++) |
776 | size += iov[i].iov_len; | |
1da177e4 | 777 | |
ce1d4d3e CH |
778 | msg->msg_name = NULL; |
779 | msg->msg_namelen = 0; | |
780 | msg->msg_control = NULL; | |
781 | msg->msg_controllen = 0; | |
89bddce5 | 782 | msg->msg_iov = (struct iovec *)iov; |
ce1d4d3e CH |
783 | msg->msg_iovlen = nr_segs; |
784 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
785 | if (sock->type == SOCK_SEQPACKET) | |
786 | msg->msg_flags |= MSG_EOR; | |
1da177e4 | 787 | |
ce1d4d3e | 788 | return __sock_sendmsg(iocb, sock, msg, size); |
1da177e4 LT |
789 | } |
790 | ||
027445c3 BP |
791 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
792 | unsigned long nr_segs, loff_t pos) | |
ce1d4d3e CH |
793 | { |
794 | struct sock_iocb siocb, *x; | |
1da177e4 | 795 | |
ce1d4d3e CH |
796 | if (pos != 0) |
797 | return -ESPIPE; | |
027445c3 | 798 | |
027445c3 | 799 | x = alloc_sock_iocb(iocb, &siocb); |
ce1d4d3e CH |
800 | if (!x) |
801 | return -ENOMEM; | |
1da177e4 | 802 | |
027445c3 | 803 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
1da177e4 LT |
804 | } |
805 | ||
1da177e4 LT |
806 | /* |
807 | * Atomic setting of ioctl hooks to avoid race | |
808 | * with module unload. | |
809 | */ | |
810 | ||
4a3e2f71 | 811 | static DEFINE_MUTEX(br_ioctl_mutex); |
881d966b | 812 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL; |
1da177e4 | 813 | |
881d966b | 814 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
1da177e4 | 815 | { |
4a3e2f71 | 816 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 817 | br_ioctl_hook = hook; |
4a3e2f71 | 818 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 | 819 | } |
89bddce5 | 820 | |
1da177e4 LT |
821 | EXPORT_SYMBOL(brioctl_set); |
822 | ||
4a3e2f71 | 823 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 824 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 825 | |
881d966b | 826 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 827 | { |
4a3e2f71 | 828 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 829 | vlan_ioctl_hook = hook; |
4a3e2f71 | 830 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 831 | } |
89bddce5 | 832 | |
1da177e4 LT |
833 | EXPORT_SYMBOL(vlan_ioctl_set); |
834 | ||
4a3e2f71 | 835 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
89bddce5 | 836 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1da177e4 | 837 | |
89bddce5 | 838 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 839 | { |
4a3e2f71 | 840 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 841 | dlci_ioctl_hook = hook; |
4a3e2f71 | 842 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 | 843 | } |
89bddce5 | 844 | |
1da177e4 LT |
845 | EXPORT_SYMBOL(dlci_ioctl_set); |
846 | ||
847 | /* | |
848 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
849 | * what to do with it - that's up to the protocol still. | |
850 | */ | |
851 | ||
852 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
853 | { | |
854 | struct socket *sock; | |
881d966b | 855 | struct sock *sk; |
1da177e4 LT |
856 | void __user *argp = (void __user *)arg; |
857 | int pid, err; | |
881d966b | 858 | struct net *net; |
1da177e4 | 859 | |
b69aee04 | 860 | sock = file->private_data; |
881d966b | 861 | sk = sock->sk; |
3b1e0a65 | 862 | net = sock_net(sk); |
1da177e4 | 863 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
881d966b | 864 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 865 | } else |
d86b5e0e | 866 | #ifdef CONFIG_WIRELESS_EXT |
1da177e4 | 867 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
881d966b | 868 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 869 | } else |
89bddce5 SH |
870 | #endif /* CONFIG_WIRELESS_EXT */ |
871 | switch (cmd) { | |
1da177e4 LT |
872 | case FIOSETOWN: |
873 | case SIOCSPGRP: | |
874 | err = -EFAULT; | |
875 | if (get_user(pid, (int __user *)argp)) | |
876 | break; | |
877 | err = f_setown(sock->file, pid, 1); | |
878 | break; | |
879 | case FIOGETOWN: | |
880 | case SIOCGPGRP: | |
609d7fa9 | 881 | err = put_user(f_getown(sock->file), |
89bddce5 | 882 | (int __user *)argp); |
1da177e4 LT |
883 | break; |
884 | case SIOCGIFBR: | |
885 | case SIOCSIFBR: | |
886 | case SIOCBRADDBR: | |
887 | case SIOCBRDELBR: | |
888 | err = -ENOPKG; | |
889 | if (!br_ioctl_hook) | |
890 | request_module("bridge"); | |
891 | ||
4a3e2f71 | 892 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 893 | if (br_ioctl_hook) |
881d966b | 894 | err = br_ioctl_hook(net, cmd, argp); |
4a3e2f71 | 895 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
896 | break; |
897 | case SIOCGIFVLAN: | |
898 | case SIOCSIFVLAN: | |
899 | err = -ENOPKG; | |
900 | if (!vlan_ioctl_hook) | |
901 | request_module("8021q"); | |
902 | ||
4a3e2f71 | 903 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 904 | if (vlan_ioctl_hook) |
881d966b | 905 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 906 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 907 | break; |
1da177e4 LT |
908 | case SIOCADDDLCI: |
909 | case SIOCDELDLCI: | |
910 | err = -ENOPKG; | |
911 | if (!dlci_ioctl_hook) | |
912 | request_module("dlci"); | |
913 | ||
7512cbf6 PE |
914 | mutex_lock(&dlci_ioctl_mutex); |
915 | if (dlci_ioctl_hook) | |
1da177e4 | 916 | err = dlci_ioctl_hook(cmd, argp); |
7512cbf6 | 917 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 LT |
918 | break; |
919 | default: | |
920 | err = sock->ops->ioctl(sock, cmd, arg); | |
b5e5fa5e CH |
921 | |
922 | /* | |
923 | * If this ioctl is unknown try to hand it down | |
924 | * to the NIC driver. | |
925 | */ | |
926 | if (err == -ENOIOCTLCMD) | |
881d966b | 927 | err = dev_ioctl(net, cmd, argp); |
1da177e4 | 928 | break; |
89bddce5 | 929 | } |
1da177e4 LT |
930 | return err; |
931 | } | |
932 | ||
933 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
934 | { | |
935 | int err; | |
936 | struct socket *sock = NULL; | |
89bddce5 | 937 | |
1da177e4 LT |
938 | err = security_socket_create(family, type, protocol, 1); |
939 | if (err) | |
940 | goto out; | |
941 | ||
942 | sock = sock_alloc(); | |
943 | if (!sock) { | |
944 | err = -ENOMEM; | |
945 | goto out; | |
946 | } | |
947 | ||
1da177e4 | 948 | sock->type = type; |
7420ed23 VY |
949 | err = security_socket_post_create(sock, family, type, protocol, 1); |
950 | if (err) | |
951 | goto out_release; | |
952 | ||
1da177e4 LT |
953 | out: |
954 | *res = sock; | |
955 | return err; | |
7420ed23 VY |
956 | out_release: |
957 | sock_release(sock); | |
958 | sock = NULL; | |
959 | goto out; | |
1da177e4 LT |
960 | } |
961 | ||
962 | /* No kernel lock held - perfect */ | |
89bddce5 | 963 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
964 | { |
965 | struct socket *sock; | |
966 | ||
967 | /* | |
89bddce5 | 968 | * We can't return errors to poll, so it's either yes or no. |
1da177e4 | 969 | */ |
b69aee04 | 970 | sock = file->private_data; |
1da177e4 LT |
971 | return sock->ops->poll(file, sock, wait); |
972 | } | |
973 | ||
89bddce5 | 974 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 975 | { |
b69aee04 | 976 | struct socket *sock = file->private_data; |
1da177e4 LT |
977 | |
978 | return sock->ops->mmap(file, sock, vma); | |
979 | } | |
980 | ||
20380731 | 981 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
982 | { |
983 | /* | |
89bddce5 SH |
984 | * It was possible the inode is NULL we were |
985 | * closing an unfinished socket. | |
1da177e4 LT |
986 | */ |
987 | ||
89bddce5 | 988 | if (!inode) { |
1da177e4 LT |
989 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
990 | return 0; | |
991 | } | |
1da177e4 LT |
992 | sock_release(SOCKET_I(inode)); |
993 | return 0; | |
994 | } | |
995 | ||
996 | /* | |
997 | * Update the socket async list | |
998 | * | |
999 | * Fasync_list locking strategy. | |
1000 | * | |
1001 | * 1. fasync_list is modified only under process context socket lock | |
1002 | * i.e. under semaphore. | |
1003 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
1004 | * or under socket lock. | |
1005 | * 3. fasync_list can be used from softirq context, so that | |
1006 | * modification under socket lock have to be enhanced with | |
1007 | * write_lock_bh(&sk->sk_callback_lock). | |
1008 | * --ANK (990710) | |
1009 | */ | |
1010 | ||
1011 | static int sock_fasync(int fd, struct file *filp, int on) | |
1012 | { | |
89bddce5 | 1013 | struct fasync_struct *fa, *fna = NULL, **prev; |
1da177e4 LT |
1014 | struct socket *sock; |
1015 | struct sock *sk; | |
1016 | ||
89bddce5 | 1017 | if (on) { |
8b3a7005 | 1018 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
89bddce5 | 1019 | if (fna == NULL) |
1da177e4 LT |
1020 | return -ENOMEM; |
1021 | } | |
1022 | ||
b69aee04 | 1023 | sock = filp->private_data; |
1da177e4 | 1024 | |
89bddce5 SH |
1025 | sk = sock->sk; |
1026 | if (sk == NULL) { | |
1da177e4 LT |
1027 | kfree(fna); |
1028 | return -EINVAL; | |
1029 | } | |
1030 | ||
1031 | lock_sock(sk); | |
1032 | ||
89bddce5 | 1033 | prev = &(sock->fasync_list); |
1da177e4 | 1034 | |
89bddce5 SH |
1035 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) |
1036 | if (fa->fa_file == filp) | |
1da177e4 LT |
1037 | break; |
1038 | ||
89bddce5 SH |
1039 | if (on) { |
1040 | if (fa != NULL) { | |
1da177e4 | 1041 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1042 | fa->fa_fd = fd; |
1da177e4 LT |
1043 | write_unlock_bh(&sk->sk_callback_lock); |
1044 | ||
1045 | kfree(fna); | |
1046 | goto out; | |
1047 | } | |
89bddce5 SH |
1048 | fna->fa_file = filp; |
1049 | fna->fa_fd = fd; | |
1050 | fna->magic = FASYNC_MAGIC; | |
1051 | fna->fa_next = sock->fasync_list; | |
1da177e4 | 1052 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1053 | sock->fasync_list = fna; |
1da177e4 | 1054 | write_unlock_bh(&sk->sk_callback_lock); |
89bddce5 SH |
1055 | } else { |
1056 | if (fa != NULL) { | |
1da177e4 | 1057 | write_lock_bh(&sk->sk_callback_lock); |
89bddce5 | 1058 | *prev = fa->fa_next; |
1da177e4 LT |
1059 | write_unlock_bh(&sk->sk_callback_lock); |
1060 | kfree(fa); | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | out: | |
1065 | release_sock(sock->sk); | |
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | /* This function may be called only under socket lock or callback_lock */ | |
1070 | ||
1071 | int sock_wake_async(struct socket *sock, int how, int band) | |
1072 | { | |
1073 | if (!sock || !sock->fasync_list) | |
1074 | return -1; | |
89bddce5 | 1075 | switch (how) { |
8d8ad9d7 | 1076 | case SOCK_WAKE_WAITD: |
1da177e4 LT |
1077 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1078 | break; | |
1079 | goto call_kill; | |
8d8ad9d7 | 1080 | case SOCK_WAKE_SPACE: |
1da177e4 LT |
1081 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
1082 | break; | |
1083 | /* fall through */ | |
8d8ad9d7 | 1084 | case SOCK_WAKE_IO: |
89bddce5 | 1085 | call_kill: |
1da177e4 LT |
1086 | __kill_fasync(sock->fasync_list, SIGIO, band); |
1087 | break; | |
8d8ad9d7 | 1088 | case SOCK_WAKE_URG: |
1da177e4 LT |
1089 | __kill_fasync(sock->fasync_list, SIGURG, band); |
1090 | } | |
1091 | return 0; | |
1092 | } | |
1093 | ||
1b8d7ae4 | 1094 | static int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1095 | struct socket **res, int kern) |
1da177e4 LT |
1096 | { |
1097 | int err; | |
1098 | struct socket *sock; | |
55737fda | 1099 | const struct net_proto_family *pf; |
1da177e4 LT |
1100 | |
1101 | /* | |
89bddce5 | 1102 | * Check protocol is in range |
1da177e4 LT |
1103 | */ |
1104 | if (family < 0 || family >= NPROTO) | |
1105 | return -EAFNOSUPPORT; | |
1106 | if (type < 0 || type >= SOCK_MAX) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | /* Compatibility. | |
1110 | ||
1111 | This uglymoron is moved from INET layer to here to avoid | |
1112 | deadlock in module load. | |
1113 | */ | |
1114 | if (family == PF_INET && type == SOCK_PACKET) { | |
89bddce5 | 1115 | static int warned; |
1da177e4 LT |
1116 | if (!warned) { |
1117 | warned = 1; | |
89bddce5 SH |
1118 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1119 | current->comm); | |
1da177e4 LT |
1120 | } |
1121 | family = PF_PACKET; | |
1122 | } | |
1123 | ||
1124 | err = security_socket_create(family, type, protocol, kern); | |
1125 | if (err) | |
1126 | return err; | |
89bddce5 | 1127 | |
55737fda SH |
1128 | /* |
1129 | * Allocate the socket and allow the family to set things up. if | |
1130 | * the protocol is 0, the family is instructed to select an appropriate | |
1131 | * default. | |
1132 | */ | |
1133 | sock = sock_alloc(); | |
1134 | if (!sock) { | |
1135 | if (net_ratelimit()) | |
1136 | printk(KERN_WARNING "socket: no more sockets\n"); | |
1137 | return -ENFILE; /* Not exactly a match, but its the | |
1138 | closest posix thing */ | |
1139 | } | |
1140 | ||
1141 | sock->type = type; | |
1142 | ||
95a5afca | 1143 | #ifdef CONFIG_MODULES |
89bddce5 SH |
1144 | /* Attempt to load a protocol module if the find failed. |
1145 | * | |
1146 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1147 | * requested real, full-featured networking support upon configuration. |
1148 | * Otherwise module support will break! | |
1149 | */ | |
55737fda | 1150 | if (net_families[family] == NULL) |
89bddce5 | 1151 | request_module("net-pf-%d", family); |
1da177e4 LT |
1152 | #endif |
1153 | ||
55737fda SH |
1154 | rcu_read_lock(); |
1155 | pf = rcu_dereference(net_families[family]); | |
1156 | err = -EAFNOSUPPORT; | |
1157 | if (!pf) | |
1158 | goto out_release; | |
1da177e4 LT |
1159 | |
1160 | /* | |
1161 | * We will call the ->create function, that possibly is in a loadable | |
1162 | * module, so we have to bump that loadable module refcnt first. | |
1163 | */ | |
55737fda | 1164 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1165 | goto out_release; |
1166 | ||
55737fda SH |
1167 | /* Now protected by module ref count */ |
1168 | rcu_read_unlock(); | |
1169 | ||
1b8d7ae4 | 1170 | err = pf->create(net, sock, protocol); |
55737fda | 1171 | if (err < 0) |
1da177e4 | 1172 | goto out_module_put; |
a79af59e | 1173 | |
1da177e4 LT |
1174 | /* |
1175 | * Now to bump the refcnt of the [loadable] module that owns this | |
1176 | * socket at sock_release time we decrement its refcnt. | |
1177 | */ | |
55737fda SH |
1178 | if (!try_module_get(sock->ops->owner)) |
1179 | goto out_module_busy; | |
1180 | ||
1da177e4 LT |
1181 | /* |
1182 | * Now that we're done with the ->create function, the [loadable] | |
1183 | * module can have its refcnt decremented | |
1184 | */ | |
55737fda | 1185 | module_put(pf->owner); |
7420ed23 VY |
1186 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1187 | if (err) | |
3b185525 | 1188 | goto out_sock_release; |
55737fda | 1189 | *res = sock; |
1da177e4 | 1190 | |
55737fda SH |
1191 | return 0; |
1192 | ||
1193 | out_module_busy: | |
1194 | err = -EAFNOSUPPORT; | |
1da177e4 | 1195 | out_module_put: |
55737fda SH |
1196 | sock->ops = NULL; |
1197 | module_put(pf->owner); | |
1198 | out_sock_release: | |
1da177e4 | 1199 | sock_release(sock); |
55737fda SH |
1200 | return err; |
1201 | ||
1202 | out_release: | |
1203 | rcu_read_unlock(); | |
1204 | goto out_sock_release; | |
1da177e4 LT |
1205 | } |
1206 | ||
1207 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1208 | { | |
1b8d7ae4 | 1209 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1213 | { | |
1b8d7ae4 | 1214 | return __sock_create(&init_net, family, type, protocol, res, 1); |
1da177e4 LT |
1215 | } |
1216 | ||
1217 | asmlinkage long sys_socket(int family, int type, int protocol) | |
1218 | { | |
1219 | int retval; | |
1220 | struct socket *sock; | |
a677a039 UD |
1221 | int flags; |
1222 | ||
e38b36f3 UD |
1223 | /* Check the SOCK_* constants for consistency. */ |
1224 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1225 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1226 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1227 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1228 | ||
a677a039 | 1229 | flags = type & ~SOCK_TYPE_MASK; |
77d27200 | 1230 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1231 | return -EINVAL; |
1232 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1233 | |
aaca0bdc UD |
1234 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1235 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1236 | ||
1da177e4 LT |
1237 | retval = sock_create(family, type, protocol, &sock); |
1238 | if (retval < 0) | |
1239 | goto out; | |
1240 | ||
77d27200 | 1241 | retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1da177e4 LT |
1242 | if (retval < 0) |
1243 | goto out_release; | |
1244 | ||
1245 | out: | |
1246 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1247 | return retval; | |
1248 | ||
1249 | out_release: | |
1250 | sock_release(sock); | |
1251 | return retval; | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Create a pair of connected sockets. | |
1256 | */ | |
1257 | ||
89bddce5 SH |
1258 | asmlinkage long sys_socketpair(int family, int type, int protocol, |
1259 | int __user *usockvec) | |
1da177e4 LT |
1260 | { |
1261 | struct socket *sock1, *sock2; | |
1262 | int fd1, fd2, err; | |
db349509 | 1263 | struct file *newfile1, *newfile2; |
a677a039 UD |
1264 | int flags; |
1265 | ||
1266 | flags = type & ~SOCK_TYPE_MASK; | |
77d27200 | 1267 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1268 | return -EINVAL; |
1269 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1270 | |
aaca0bdc UD |
1271 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1272 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1273 | ||
1da177e4 LT |
1274 | /* |
1275 | * Obtain the first socket and check if the underlying protocol | |
1276 | * supports the socketpair call. | |
1277 | */ | |
1278 | ||
1279 | err = sock_create(family, type, protocol, &sock1); | |
1280 | if (err < 0) | |
1281 | goto out; | |
1282 | ||
1283 | err = sock_create(family, type, protocol, &sock2); | |
1284 | if (err < 0) | |
1285 | goto out_release_1; | |
1286 | ||
1287 | err = sock1->ops->socketpair(sock1, sock2); | |
89bddce5 | 1288 | if (err < 0) |
1da177e4 LT |
1289 | goto out_release_both; |
1290 | ||
a677a039 | 1291 | fd1 = sock_alloc_fd(&newfile1, flags & O_CLOEXEC); |
bf3c23d1 DM |
1292 | if (unlikely(fd1 < 0)) { |
1293 | err = fd1; | |
db349509 | 1294 | goto out_release_both; |
bf3c23d1 | 1295 | } |
1da177e4 | 1296 | |
a677a039 | 1297 | fd2 = sock_alloc_fd(&newfile2, flags & O_CLOEXEC); |
db349509 | 1298 | if (unlikely(fd2 < 0)) { |
bf3c23d1 | 1299 | err = fd2; |
db349509 AV |
1300 | put_filp(newfile1); |
1301 | put_unused_fd(fd1); | |
1da177e4 | 1302 | goto out_release_both; |
db349509 | 1303 | } |
1da177e4 | 1304 | |
77d27200 | 1305 | err = sock_attach_fd(sock1, newfile1, flags & O_NONBLOCK); |
db349509 AV |
1306 | if (unlikely(err < 0)) { |
1307 | goto out_fd2; | |
1308 | } | |
1309 | ||
77d27200 | 1310 | err = sock_attach_fd(sock2, newfile2, flags & O_NONBLOCK); |
db349509 AV |
1311 | if (unlikely(err < 0)) { |
1312 | fput(newfile1); | |
1313 | goto out_fd1; | |
1314 | } | |
1315 | ||
1316 | err = audit_fd_pair(fd1, fd2); | |
1317 | if (err < 0) { | |
1318 | fput(newfile1); | |
1319 | fput(newfile2); | |
1320 | goto out_fd; | |
1321 | } | |
1da177e4 | 1322 | |
db349509 AV |
1323 | fd_install(fd1, newfile1); |
1324 | fd_install(fd2, newfile2); | |
1da177e4 LT |
1325 | /* fd1 and fd2 may be already another descriptors. |
1326 | * Not kernel problem. | |
1327 | */ | |
1328 | ||
89bddce5 | 1329 | err = put_user(fd1, &usockvec[0]); |
1da177e4 LT |
1330 | if (!err) |
1331 | err = put_user(fd2, &usockvec[1]); | |
1332 | if (!err) | |
1333 | return 0; | |
1334 | ||
1335 | sys_close(fd2); | |
1336 | sys_close(fd1); | |
1337 | return err; | |
1338 | ||
1da177e4 | 1339 | out_release_both: |
89bddce5 | 1340 | sock_release(sock2); |
1da177e4 | 1341 | out_release_1: |
89bddce5 | 1342 | sock_release(sock1); |
1da177e4 LT |
1343 | out: |
1344 | return err; | |
db349509 AV |
1345 | |
1346 | out_fd2: | |
1347 | put_filp(newfile1); | |
1348 | sock_release(sock1); | |
1349 | out_fd1: | |
1350 | put_filp(newfile2); | |
1351 | sock_release(sock2); | |
1352 | out_fd: | |
1353 | put_unused_fd(fd1); | |
1354 | put_unused_fd(fd2); | |
1355 | goto out; | |
1da177e4 LT |
1356 | } |
1357 | ||
1da177e4 LT |
1358 | /* |
1359 | * Bind a name to a socket. Nothing much to do here since it's | |
1360 | * the protocol's responsibility to handle the local address. | |
1361 | * | |
1362 | * We move the socket address to kernel space before we call | |
1363 | * the protocol layer (having also checked the address is ok). | |
1364 | */ | |
1365 | ||
1366 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) | |
1367 | { | |
1368 | struct socket *sock; | |
230b1839 | 1369 | struct sockaddr_storage address; |
6cb153ca | 1370 | int err, fput_needed; |
1da177e4 | 1371 | |
89bddce5 | 1372 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1373 | if (sock) { |
230b1839 | 1374 | err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address); |
89bddce5 SH |
1375 | if (err >= 0) { |
1376 | err = security_socket_bind(sock, | |
230b1839 | 1377 | (struct sockaddr *)&address, |
89bddce5 | 1378 | addrlen); |
6cb153ca BL |
1379 | if (!err) |
1380 | err = sock->ops->bind(sock, | |
89bddce5 | 1381 | (struct sockaddr *) |
230b1839 | 1382 | &address, addrlen); |
1da177e4 | 1383 | } |
6cb153ca | 1384 | fput_light(sock->file, fput_needed); |
89bddce5 | 1385 | } |
1da177e4 LT |
1386 | return err; |
1387 | } | |
1388 | ||
1da177e4 LT |
1389 | /* |
1390 | * Perform a listen. Basically, we allow the protocol to do anything | |
1391 | * necessary for a listen, and if that works, we mark the socket as | |
1392 | * ready for listening. | |
1393 | */ | |
1394 | ||
1da177e4 LT |
1395 | asmlinkage long sys_listen(int fd, int backlog) |
1396 | { | |
1397 | struct socket *sock; | |
6cb153ca | 1398 | int err, fput_needed; |
b8e1f9b5 | 1399 | int somaxconn; |
89bddce5 SH |
1400 | |
1401 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1402 | if (sock) { | |
8efa6e93 | 1403 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; |
b8e1f9b5 PE |
1404 | if ((unsigned)backlog > somaxconn) |
1405 | backlog = somaxconn; | |
1da177e4 LT |
1406 | |
1407 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1408 | if (!err) |
1409 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1410 | |
6cb153ca | 1411 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1412 | } |
1413 | return err; | |
1414 | } | |
1415 | ||
1da177e4 LT |
1416 | /* |
1417 | * For accept, we attempt to create a new socket, set up the link | |
1418 | * with the client, wake up the client, then return the new | |
1419 | * connected fd. We collect the address of the connector in kernel | |
1420 | * space and move it to user at the very end. This is unclean because | |
1421 | * we open the socket then return an error. | |
1422 | * | |
1423 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1424 | * status to recvmsg. We need to add that support in a way thats | |
1425 | * clean when we restucture accept also. | |
1426 | */ | |
1427 | ||
de11defe UD |
1428 | asmlinkage long sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, |
1429 | int __user *upeer_addrlen, int flags) | |
1da177e4 LT |
1430 | { |
1431 | struct socket *sock, *newsock; | |
39d8c1b6 | 1432 | struct file *newfile; |
6cb153ca | 1433 | int err, len, newfd, fput_needed; |
230b1839 | 1434 | struct sockaddr_storage address; |
1da177e4 | 1435 | |
77d27200 | 1436 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
aaca0bdc UD |
1437 | return -EINVAL; |
1438 | ||
1439 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1440 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1441 | ||
6cb153ca | 1442 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1443 | if (!sock) |
1444 | goto out; | |
1445 | ||
1446 | err = -ENFILE; | |
89bddce5 | 1447 | if (!(newsock = sock_alloc())) |
1da177e4 LT |
1448 | goto out_put; |
1449 | ||
1450 | newsock->type = sock->type; | |
1451 | newsock->ops = sock->ops; | |
1452 | ||
1da177e4 LT |
1453 | /* |
1454 | * We don't need try_module_get here, as the listening socket (sock) | |
1455 | * has the protocol module (sock->ops->owner) held. | |
1456 | */ | |
1457 | __module_get(newsock->ops->owner); | |
1458 | ||
aaca0bdc | 1459 | newfd = sock_alloc_fd(&newfile, flags & O_CLOEXEC); |
39d8c1b6 DM |
1460 | if (unlikely(newfd < 0)) { |
1461 | err = newfd; | |
9a1875e6 DM |
1462 | sock_release(newsock); |
1463 | goto out_put; | |
39d8c1b6 DM |
1464 | } |
1465 | ||
77d27200 | 1466 | err = sock_attach_fd(newsock, newfile, flags & O_NONBLOCK); |
39d8c1b6 | 1467 | if (err < 0) |
79f4f642 | 1468 | goto out_fd_simple; |
39d8c1b6 | 1469 | |
a79af59e FF |
1470 | err = security_socket_accept(sock, newsock); |
1471 | if (err) | |
39d8c1b6 | 1472 | goto out_fd; |
a79af59e | 1473 | |
1da177e4 LT |
1474 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1475 | if (err < 0) | |
39d8c1b6 | 1476 | goto out_fd; |
1da177e4 LT |
1477 | |
1478 | if (upeer_sockaddr) { | |
230b1839 | 1479 | if (newsock->ops->getname(newsock, (struct sockaddr *)&address, |
89bddce5 | 1480 | &len, 2) < 0) { |
1da177e4 | 1481 | err = -ECONNABORTED; |
39d8c1b6 | 1482 | goto out_fd; |
1da177e4 | 1483 | } |
230b1839 YH |
1484 | err = move_addr_to_user((struct sockaddr *)&address, |
1485 | len, upeer_sockaddr, upeer_addrlen); | |
1da177e4 | 1486 | if (err < 0) |
39d8c1b6 | 1487 | goto out_fd; |
1da177e4 LT |
1488 | } |
1489 | ||
1490 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1491 | ||
39d8c1b6 DM |
1492 | fd_install(newfd, newfile); |
1493 | err = newfd; | |
1da177e4 LT |
1494 | |
1495 | security_socket_post_accept(sock, newsock); | |
1496 | ||
1497 | out_put: | |
6cb153ca | 1498 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1499 | out: |
1500 | return err; | |
79f4f642 AD |
1501 | out_fd_simple: |
1502 | sock_release(newsock); | |
1503 | put_filp(newfile); | |
1504 | put_unused_fd(newfd); | |
1505 | goto out_put; | |
39d8c1b6 | 1506 | out_fd: |
9606a216 | 1507 | fput(newfile); |
39d8c1b6 | 1508 | put_unused_fd(newfd); |
1da177e4 LT |
1509 | goto out_put; |
1510 | } | |
1511 | ||
aaca0bdc UD |
1512 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, |
1513 | int __user *upeer_addrlen) | |
1514 | { | |
de11defe | 1515 | return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
aaca0bdc UD |
1516 | } |
1517 | ||
1da177e4 LT |
1518 | /* |
1519 | * Attempt to connect to a socket with the server address. The address | |
1520 | * is in user space so we verify it is OK and move it to kernel space. | |
1521 | * | |
1522 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1523 | * break bindings | |
1524 | * | |
1525 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1526 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1527 | * include the -EINPROGRESS status for such sockets. | |
1528 | */ | |
1529 | ||
89bddce5 SH |
1530 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, |
1531 | int addrlen) | |
1da177e4 LT |
1532 | { |
1533 | struct socket *sock; | |
230b1839 | 1534 | struct sockaddr_storage address; |
6cb153ca | 1535 | int err, fput_needed; |
1da177e4 | 1536 | |
6cb153ca | 1537 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1538 | if (!sock) |
1539 | goto out; | |
230b1839 | 1540 | err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address); |
1da177e4 LT |
1541 | if (err < 0) |
1542 | goto out_put; | |
1543 | ||
89bddce5 | 1544 | err = |
230b1839 | 1545 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); |
1da177e4 LT |
1546 | if (err) |
1547 | goto out_put; | |
1548 | ||
230b1839 | 1549 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, |
1da177e4 LT |
1550 | sock->file->f_flags); |
1551 | out_put: | |
6cb153ca | 1552 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1553 | out: |
1554 | return err; | |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * Get the local address ('name') of a socket object. Move the obtained | |
1559 | * name to user space. | |
1560 | */ | |
1561 | ||
89bddce5 SH |
1562 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1563 | int __user *usockaddr_len) | |
1da177e4 LT |
1564 | { |
1565 | struct socket *sock; | |
230b1839 | 1566 | struct sockaddr_storage address; |
6cb153ca | 1567 | int len, err, fput_needed; |
89bddce5 | 1568 | |
6cb153ca | 1569 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1570 | if (!sock) |
1571 | goto out; | |
1572 | ||
1573 | err = security_socket_getsockname(sock); | |
1574 | if (err) | |
1575 | goto out_put; | |
1576 | ||
230b1839 | 1577 | err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); |
1da177e4 LT |
1578 | if (err) |
1579 | goto out_put; | |
230b1839 | 1580 | err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len); |
1da177e4 LT |
1581 | |
1582 | out_put: | |
6cb153ca | 1583 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1584 | out: |
1585 | return err; | |
1586 | } | |
1587 | ||
1588 | /* | |
1589 | * Get the remote address ('name') of a socket object. Move the obtained | |
1590 | * name to user space. | |
1591 | */ | |
1592 | ||
89bddce5 SH |
1593 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1594 | int __user *usockaddr_len) | |
1da177e4 LT |
1595 | { |
1596 | struct socket *sock; | |
230b1839 | 1597 | struct sockaddr_storage address; |
6cb153ca | 1598 | int len, err, fput_needed; |
1da177e4 | 1599 | |
89bddce5 SH |
1600 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1601 | if (sock != NULL) { | |
1da177e4 LT |
1602 | err = security_socket_getpeername(sock); |
1603 | if (err) { | |
6cb153ca | 1604 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1605 | return err; |
1606 | } | |
1607 | ||
89bddce5 | 1608 | err = |
230b1839 | 1609 | sock->ops->getname(sock, (struct sockaddr *)&address, &len, |
89bddce5 | 1610 | 1); |
1da177e4 | 1611 | if (!err) |
230b1839 | 1612 | err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, |
89bddce5 | 1613 | usockaddr_len); |
6cb153ca | 1614 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1615 | } |
1616 | return err; | |
1617 | } | |
1618 | ||
1619 | /* | |
1620 | * Send a datagram to a given address. We move the address into kernel | |
1621 | * space and check the user space data area is readable before invoking | |
1622 | * the protocol. | |
1623 | */ | |
1624 | ||
89bddce5 SH |
1625 | asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, |
1626 | unsigned flags, struct sockaddr __user *addr, | |
1627 | int addr_len) | |
1da177e4 LT |
1628 | { |
1629 | struct socket *sock; | |
230b1839 | 1630 | struct sockaddr_storage address; |
1da177e4 LT |
1631 | int err; |
1632 | struct msghdr msg; | |
1633 | struct iovec iov; | |
6cb153ca | 1634 | int fput_needed; |
6cb153ca | 1635 | |
de0fa95c PE |
1636 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1637 | if (!sock) | |
4387ff75 | 1638 | goto out; |
6cb153ca | 1639 | |
89bddce5 SH |
1640 | iov.iov_base = buff; |
1641 | iov.iov_len = len; | |
1642 | msg.msg_name = NULL; | |
1643 | msg.msg_iov = &iov; | |
1644 | msg.msg_iovlen = 1; | |
1645 | msg.msg_control = NULL; | |
1646 | msg.msg_controllen = 0; | |
1647 | msg.msg_namelen = 0; | |
6cb153ca | 1648 | if (addr) { |
230b1839 | 1649 | err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address); |
1da177e4 LT |
1650 | if (err < 0) |
1651 | goto out_put; | |
230b1839 | 1652 | msg.msg_name = (struct sockaddr *)&address; |
89bddce5 | 1653 | msg.msg_namelen = addr_len; |
1da177e4 LT |
1654 | } |
1655 | if (sock->file->f_flags & O_NONBLOCK) | |
1656 | flags |= MSG_DONTWAIT; | |
1657 | msg.msg_flags = flags; | |
1658 | err = sock_sendmsg(sock, &msg, len); | |
1659 | ||
89bddce5 | 1660 | out_put: |
de0fa95c | 1661 | fput_light(sock->file, fput_needed); |
4387ff75 | 1662 | out: |
1da177e4 LT |
1663 | return err; |
1664 | } | |
1665 | ||
1666 | /* | |
89bddce5 | 1667 | * Send a datagram down a socket. |
1da177e4 LT |
1668 | */ |
1669 | ||
89bddce5 | 1670 | asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) |
1da177e4 LT |
1671 | { |
1672 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1673 | } | |
1674 | ||
1675 | /* | |
89bddce5 | 1676 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
1677 | * sender. We verify the buffers are writable and if needed move the |
1678 | * sender address from kernel to user space. | |
1679 | */ | |
1680 | ||
89bddce5 SH |
1681 | asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, |
1682 | unsigned flags, struct sockaddr __user *addr, | |
1683 | int __user *addr_len) | |
1da177e4 LT |
1684 | { |
1685 | struct socket *sock; | |
1686 | struct iovec iov; | |
1687 | struct msghdr msg; | |
230b1839 | 1688 | struct sockaddr_storage address; |
89bddce5 | 1689 | int err, err2; |
6cb153ca BL |
1690 | int fput_needed; |
1691 | ||
de0fa95c | 1692 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 1693 | if (!sock) |
de0fa95c | 1694 | goto out; |
1da177e4 | 1695 | |
89bddce5 SH |
1696 | msg.msg_control = NULL; |
1697 | msg.msg_controllen = 0; | |
1698 | msg.msg_iovlen = 1; | |
1699 | msg.msg_iov = &iov; | |
1700 | iov.iov_len = size; | |
1701 | iov.iov_base = ubuf; | |
230b1839 YH |
1702 | msg.msg_name = (struct sockaddr *)&address; |
1703 | msg.msg_namelen = sizeof(address); | |
1da177e4 LT |
1704 | if (sock->file->f_flags & O_NONBLOCK) |
1705 | flags |= MSG_DONTWAIT; | |
89bddce5 | 1706 | err = sock_recvmsg(sock, &msg, size, flags); |
1da177e4 | 1707 | |
89bddce5 | 1708 | if (err >= 0 && addr != NULL) { |
230b1839 YH |
1709 | err2 = move_addr_to_user((struct sockaddr *)&address, |
1710 | msg.msg_namelen, addr, addr_len); | |
89bddce5 SH |
1711 | if (err2 < 0) |
1712 | err = err2; | |
1da177e4 | 1713 | } |
de0fa95c PE |
1714 | |
1715 | fput_light(sock->file, fput_needed); | |
4387ff75 | 1716 | out: |
1da177e4 LT |
1717 | return err; |
1718 | } | |
1719 | ||
1720 | /* | |
89bddce5 | 1721 | * Receive a datagram from a socket. |
1da177e4 LT |
1722 | */ |
1723 | ||
89bddce5 SH |
1724 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
1725 | unsigned flags) | |
1da177e4 LT |
1726 | { |
1727 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1728 | } | |
1729 | ||
1730 | /* | |
1731 | * Set a socket option. Because we don't know the option lengths we have | |
1732 | * to pass the user mode parameter for the protocols to sort out. | |
1733 | */ | |
1734 | ||
89bddce5 SH |
1735 | asmlinkage long sys_setsockopt(int fd, int level, int optname, |
1736 | char __user *optval, int optlen) | |
1da177e4 | 1737 | { |
6cb153ca | 1738 | int err, fput_needed; |
1da177e4 LT |
1739 | struct socket *sock; |
1740 | ||
1741 | if (optlen < 0) | |
1742 | return -EINVAL; | |
89bddce5 SH |
1743 | |
1744 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1745 | if (sock != NULL) { | |
1746 | err = security_socket_setsockopt(sock, level, optname); | |
6cb153ca BL |
1747 | if (err) |
1748 | goto out_put; | |
1da177e4 LT |
1749 | |
1750 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1751 | err = |
1752 | sock_setsockopt(sock, level, optname, optval, | |
1753 | optlen); | |
1da177e4 | 1754 | else |
89bddce5 SH |
1755 | err = |
1756 | sock->ops->setsockopt(sock, level, optname, optval, | |
1757 | optlen); | |
6cb153ca BL |
1758 | out_put: |
1759 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1760 | } |
1761 | return err; | |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * Get a socket option. Because we don't know the option lengths we have | |
1766 | * to pass a user mode parameter for the protocols to sort out. | |
1767 | */ | |
1768 | ||
89bddce5 SH |
1769 | asmlinkage long sys_getsockopt(int fd, int level, int optname, |
1770 | char __user *optval, int __user *optlen) | |
1da177e4 | 1771 | { |
6cb153ca | 1772 | int err, fput_needed; |
1da177e4 LT |
1773 | struct socket *sock; |
1774 | ||
89bddce5 SH |
1775 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1776 | if (sock != NULL) { | |
6cb153ca BL |
1777 | err = security_socket_getsockopt(sock, level, optname); |
1778 | if (err) | |
1779 | goto out_put; | |
1da177e4 LT |
1780 | |
1781 | if (level == SOL_SOCKET) | |
89bddce5 SH |
1782 | err = |
1783 | sock_getsockopt(sock, level, optname, optval, | |
1784 | optlen); | |
1da177e4 | 1785 | else |
89bddce5 SH |
1786 | err = |
1787 | sock->ops->getsockopt(sock, level, optname, optval, | |
1788 | optlen); | |
6cb153ca BL |
1789 | out_put: |
1790 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1791 | } |
1792 | return err; | |
1793 | } | |
1794 | ||
1da177e4 LT |
1795 | /* |
1796 | * Shutdown a socket. | |
1797 | */ | |
1798 | ||
1799 | asmlinkage long sys_shutdown(int fd, int how) | |
1800 | { | |
6cb153ca | 1801 | int err, fput_needed; |
1da177e4 LT |
1802 | struct socket *sock; |
1803 | ||
89bddce5 SH |
1804 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1805 | if (sock != NULL) { | |
1da177e4 | 1806 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
1807 | if (!err) |
1808 | err = sock->ops->shutdown(sock, how); | |
1809 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
1810 | } |
1811 | return err; | |
1812 | } | |
1813 | ||
89bddce5 | 1814 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
1815 | * fields which are the same type (int / unsigned) on our platforms. |
1816 | */ | |
1817 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1818 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1819 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1820 | ||
1da177e4 LT |
1821 | /* |
1822 | * BSD sendmsg interface | |
1823 | */ | |
1824 | ||
1825 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
1826 | { | |
89bddce5 SH |
1827 | struct compat_msghdr __user *msg_compat = |
1828 | (struct compat_msghdr __user *)msg; | |
1da177e4 | 1829 | struct socket *sock; |
230b1839 | 1830 | struct sockaddr_storage address; |
1da177e4 | 1831 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
b9d717a7 | 1832 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
89bddce5 SH |
1833 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
1834 | /* 20 is size of ipv6_pktinfo */ | |
1da177e4 LT |
1835 | unsigned char *ctl_buf = ctl; |
1836 | struct msghdr msg_sys; | |
1837 | int err, ctl_len, iov_size, total_len; | |
6cb153ca | 1838 | int fput_needed; |
89bddce5 | 1839 | |
1da177e4 LT |
1840 | err = -EFAULT; |
1841 | if (MSG_CMSG_COMPAT & flags) { | |
1842 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1843 | return -EFAULT; | |
89bddce5 SH |
1844 | } |
1845 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1da177e4 LT |
1846 | return -EFAULT; |
1847 | ||
6cb153ca | 1848 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
89bddce5 | 1849 | if (!sock) |
1da177e4 LT |
1850 | goto out; |
1851 | ||
1852 | /* do not move before msg_sys is valid */ | |
1853 | err = -EMSGSIZE; | |
1854 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1855 | goto out_put; | |
1856 | ||
89bddce5 | 1857 | /* Check whether to allocate the iovec area */ |
1da177e4 LT |
1858 | err = -ENOMEM; |
1859 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1860 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1861 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1862 | if (!iov) | |
1863 | goto out_put; | |
1864 | } | |
1865 | ||
1866 | /* This will also move the address data into kernel space */ | |
1867 | if (MSG_CMSG_COMPAT & flags) { | |
230b1839 YH |
1868 | err = verify_compat_iovec(&msg_sys, iov, |
1869 | (struct sockaddr *)&address, | |
1870 | VERIFY_READ); | |
1da177e4 | 1871 | } else |
230b1839 YH |
1872 | err = verify_iovec(&msg_sys, iov, |
1873 | (struct sockaddr *)&address, | |
1874 | VERIFY_READ); | |
89bddce5 | 1875 | if (err < 0) |
1da177e4 LT |
1876 | goto out_freeiov; |
1877 | total_len = err; | |
1878 | ||
1879 | err = -ENOBUFS; | |
1880 | ||
1881 | if (msg_sys.msg_controllen > INT_MAX) | |
1882 | goto out_freeiov; | |
89bddce5 | 1883 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1884 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 SH |
1885 | err = |
1886 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, | |
1887 | sizeof(ctl)); | |
1da177e4 LT |
1888 | if (err) |
1889 | goto out_freeiov; | |
1890 | ctl_buf = msg_sys.msg_control; | |
8920e8f9 | 1891 | ctl_len = msg_sys.msg_controllen; |
1da177e4 | 1892 | } else if (ctl_len) { |
89bddce5 | 1893 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 1894 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 1895 | if (ctl_buf == NULL) |
1da177e4 LT |
1896 | goto out_freeiov; |
1897 | } | |
1898 | err = -EFAULT; | |
1899 | /* | |
1900 | * Careful! Before this, msg_sys.msg_control contains a user pointer. | |
1901 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1902 | * checking falls down on this. | |
1903 | */ | |
89bddce5 SH |
1904 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, |
1905 | ctl_len)) | |
1da177e4 LT |
1906 | goto out_freectl; |
1907 | msg_sys.msg_control = ctl_buf; | |
1908 | } | |
1909 | msg_sys.msg_flags = flags; | |
1910 | ||
1911 | if (sock->file->f_flags & O_NONBLOCK) | |
1912 | msg_sys.msg_flags |= MSG_DONTWAIT; | |
1913 | err = sock_sendmsg(sock, &msg_sys, total_len); | |
1914 | ||
1915 | out_freectl: | |
89bddce5 | 1916 | if (ctl_buf != ctl) |
1da177e4 LT |
1917 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
1918 | out_freeiov: | |
1919 | if (iov != iovstack) | |
1920 | sock_kfree_s(sock->sk, iov, iov_size); | |
1921 | out_put: | |
6cb153ca | 1922 | fput_light(sock->file, fput_needed); |
89bddce5 | 1923 | out: |
1da177e4 LT |
1924 | return err; |
1925 | } | |
1926 | ||
1927 | /* | |
1928 | * BSD recvmsg interface | |
1929 | */ | |
1930 | ||
89bddce5 SH |
1931 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, |
1932 | unsigned int flags) | |
1da177e4 | 1933 | { |
89bddce5 SH |
1934 | struct compat_msghdr __user *msg_compat = |
1935 | (struct compat_msghdr __user *)msg; | |
1da177e4 LT |
1936 | struct socket *sock; |
1937 | struct iovec iovstack[UIO_FASTIOV]; | |
89bddce5 | 1938 | struct iovec *iov = iovstack; |
1da177e4 LT |
1939 | struct msghdr msg_sys; |
1940 | unsigned long cmsg_ptr; | |
1941 | int err, iov_size, total_len, len; | |
6cb153ca | 1942 | int fput_needed; |
1da177e4 LT |
1943 | |
1944 | /* kernel mode address */ | |
230b1839 | 1945 | struct sockaddr_storage addr; |
1da177e4 LT |
1946 | |
1947 | /* user mode address pointers */ | |
1948 | struct sockaddr __user *uaddr; | |
1949 | int __user *uaddr_len; | |
89bddce5 | 1950 | |
1da177e4 LT |
1951 | if (MSG_CMSG_COMPAT & flags) { |
1952 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1953 | return -EFAULT; | |
89bddce5 SH |
1954 | } |
1955 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1956 | return -EFAULT; | |
1da177e4 | 1957 | |
6cb153ca | 1958 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1959 | if (!sock) |
1960 | goto out; | |
1961 | ||
1962 | err = -EMSGSIZE; | |
1963 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1964 | goto out_put; | |
89bddce5 SH |
1965 | |
1966 | /* Check whether to allocate the iovec area */ | |
1da177e4 LT |
1967 | err = -ENOMEM; |
1968 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1969 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1970 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1971 | if (!iov) | |
1972 | goto out_put; | |
1973 | } | |
1974 | ||
1975 | /* | |
89bddce5 SH |
1976 | * Save the user-mode address (verify_iovec will change the |
1977 | * kernel msghdr to use the kernel address space) | |
1da177e4 | 1978 | */ |
89bddce5 | 1979 | |
cfcabdcc | 1980 | uaddr = (__force void __user *)msg_sys.msg_name; |
1da177e4 LT |
1981 | uaddr_len = COMPAT_NAMELEN(msg); |
1982 | if (MSG_CMSG_COMPAT & flags) { | |
230b1839 YH |
1983 | err = verify_compat_iovec(&msg_sys, iov, |
1984 | (struct sockaddr *)&addr, | |
1985 | VERIFY_WRITE); | |
1da177e4 | 1986 | } else |
230b1839 YH |
1987 | err = verify_iovec(&msg_sys, iov, |
1988 | (struct sockaddr *)&addr, | |
1989 | VERIFY_WRITE); | |
1da177e4 LT |
1990 | if (err < 0) |
1991 | goto out_freeiov; | |
89bddce5 | 1992 | total_len = err; |
1da177e4 LT |
1993 | |
1994 | cmsg_ptr = (unsigned long)msg_sys.msg_control; | |
4a19542e | 1995 | msg_sys.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); |
89bddce5 | 1996 | |
1da177e4 LT |
1997 | if (sock->file->f_flags & O_NONBLOCK) |
1998 | flags |= MSG_DONTWAIT; | |
1999 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); | |
2000 | if (err < 0) | |
2001 | goto out_freeiov; | |
2002 | len = err; | |
2003 | ||
2004 | if (uaddr != NULL) { | |
230b1839 YH |
2005 | err = move_addr_to_user((struct sockaddr *)&addr, |
2006 | msg_sys.msg_namelen, uaddr, | |
89bddce5 | 2007 | uaddr_len); |
1da177e4 LT |
2008 | if (err < 0) |
2009 | goto out_freeiov; | |
2010 | } | |
37f7f421 DM |
2011 | err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), |
2012 | COMPAT_FLAGS(msg)); | |
1da177e4 LT |
2013 | if (err) |
2014 | goto out_freeiov; | |
2015 | if (MSG_CMSG_COMPAT & flags) | |
89bddce5 | 2016 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
2017 | &msg_compat->msg_controllen); |
2018 | else | |
89bddce5 | 2019 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
1da177e4 LT |
2020 | &msg->msg_controllen); |
2021 | if (err) | |
2022 | goto out_freeiov; | |
2023 | err = len; | |
2024 | ||
2025 | out_freeiov: | |
2026 | if (iov != iovstack) | |
2027 | sock_kfree_s(sock->sk, iov, iov_size); | |
2028 | out_put: | |
6cb153ca | 2029 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2030 | out: |
2031 | return err; | |
2032 | } | |
2033 | ||
2034 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
2035 | ||
2036 | /* Argument list sizes for sys_socketcall */ | |
2037 | #define AL(x) ((x) * sizeof(unsigned long)) | |
aaca0bdc | 2038 | static const unsigned char nargs[19]={ |
89bddce5 SH |
2039 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), |
2040 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), | |
aaca0bdc | 2041 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3), |
de11defe | 2042 | AL(4) |
89bddce5 SH |
2043 | }; |
2044 | ||
1da177e4 LT |
2045 | #undef AL |
2046 | ||
2047 | /* | |
89bddce5 | 2048 | * System call vectors. |
1da177e4 LT |
2049 | * |
2050 | * Argument checking cleaned up. Saved 20% in size. | |
2051 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 2052 | * it is set by the callees. |
1da177e4 LT |
2053 | */ |
2054 | ||
2055 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) | |
2056 | { | |
2057 | unsigned long a[6]; | |
89bddce5 | 2058 | unsigned long a0, a1; |
1da177e4 LT |
2059 | int err; |
2060 | ||
de11defe | 2061 | if (call < 1 || call > SYS_ACCEPT4) |
1da177e4 LT |
2062 | return -EINVAL; |
2063 | ||
2064 | /* copy_from_user should be SMP safe. */ | |
2065 | if (copy_from_user(a, args, nargs[call])) | |
2066 | return -EFAULT; | |
3ec3b2fb | 2067 | |
f3298dc4 | 2068 | audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
3ec3b2fb | 2069 | |
89bddce5 SH |
2070 | a0 = a[0]; |
2071 | a1 = a[1]; | |
2072 | ||
2073 | switch (call) { | |
2074 | case SYS_SOCKET: | |
2075 | err = sys_socket(a0, a1, a[2]); | |
2076 | break; | |
2077 | case SYS_BIND: | |
2078 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2079 | break; | |
2080 | case SYS_CONNECT: | |
2081 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2082 | break; | |
2083 | case SYS_LISTEN: | |
2084 | err = sys_listen(a0, a1); | |
2085 | break; | |
2086 | case SYS_ACCEPT: | |
de11defe UD |
2087 | err = sys_accept4(a0, (struct sockaddr __user *)a1, |
2088 | (int __user *)a[2], 0); | |
89bddce5 SH |
2089 | break; |
2090 | case SYS_GETSOCKNAME: | |
2091 | err = | |
2092 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2093 | (int __user *)a[2]); | |
2094 | break; | |
2095 | case SYS_GETPEERNAME: | |
2096 | err = | |
2097 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2098 | (int __user *)a[2]); | |
2099 | break; | |
2100 | case SYS_SOCKETPAIR: | |
2101 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2102 | break; | |
2103 | case SYS_SEND: | |
2104 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2105 | break; | |
2106 | case SYS_SENDTO: | |
2107 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2108 | (struct sockaddr __user *)a[4], a[5]); | |
2109 | break; | |
2110 | case SYS_RECV: | |
2111 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2112 | break; | |
2113 | case SYS_RECVFROM: | |
2114 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2115 | (struct sockaddr __user *)a[4], | |
2116 | (int __user *)a[5]); | |
2117 | break; | |
2118 | case SYS_SHUTDOWN: | |
2119 | err = sys_shutdown(a0, a1); | |
2120 | break; | |
2121 | case SYS_SETSOCKOPT: | |
2122 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2123 | break; | |
2124 | case SYS_GETSOCKOPT: | |
2125 | err = | |
2126 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2127 | (int __user *)a[4]); | |
2128 | break; | |
2129 | case SYS_SENDMSG: | |
2130 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2131 | break; | |
2132 | case SYS_RECVMSG: | |
2133 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); | |
2134 | break; | |
de11defe UD |
2135 | case SYS_ACCEPT4: |
2136 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2137 | (int __user *)a[2], a[3]); | |
aaca0bdc | 2138 | break; |
89bddce5 SH |
2139 | default: |
2140 | err = -EINVAL; | |
2141 | break; | |
1da177e4 LT |
2142 | } |
2143 | return err; | |
2144 | } | |
2145 | ||
89bddce5 | 2146 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2147 | |
55737fda SH |
2148 | /** |
2149 | * sock_register - add a socket protocol handler | |
2150 | * @ops: description of protocol | |
2151 | * | |
1da177e4 LT |
2152 | * This function is called by a protocol handler that wants to |
2153 | * advertise its address family, and have it linked into the | |
55737fda SH |
2154 | * socket interface. The value ops->family coresponds to the |
2155 | * socket system call protocol family. | |
1da177e4 | 2156 | */ |
f0fd27d4 | 2157 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2158 | { |
2159 | int err; | |
2160 | ||
2161 | if (ops->family >= NPROTO) { | |
89bddce5 SH |
2162 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
2163 | NPROTO); | |
1da177e4 LT |
2164 | return -ENOBUFS; |
2165 | } | |
55737fda SH |
2166 | |
2167 | spin_lock(&net_family_lock); | |
2168 | if (net_families[ops->family]) | |
2169 | err = -EEXIST; | |
2170 | else { | |
89bddce5 | 2171 | net_families[ops->family] = ops; |
1da177e4 LT |
2172 | err = 0; |
2173 | } | |
55737fda SH |
2174 | spin_unlock(&net_family_lock); |
2175 | ||
89bddce5 | 2176 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
2177 | return err; |
2178 | } | |
2179 | ||
55737fda SH |
2180 | /** |
2181 | * sock_unregister - remove a protocol handler | |
2182 | * @family: protocol family to remove | |
2183 | * | |
1da177e4 LT |
2184 | * This function is called by a protocol handler that wants to |
2185 | * remove its address family, and have it unlinked from the | |
55737fda SH |
2186 | * new socket creation. |
2187 | * | |
2188 | * If protocol handler is a module, then it can use module reference | |
2189 | * counts to protect against new references. If protocol handler is not | |
2190 | * a module then it needs to provide its own protection in | |
2191 | * the ops->create routine. | |
1da177e4 | 2192 | */ |
f0fd27d4 | 2193 | void sock_unregister(int family) |
1da177e4 | 2194 | { |
f0fd27d4 | 2195 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 2196 | |
55737fda | 2197 | spin_lock(&net_family_lock); |
89bddce5 | 2198 | net_families[family] = NULL; |
55737fda SH |
2199 | spin_unlock(&net_family_lock); |
2200 | ||
2201 | synchronize_rcu(); | |
2202 | ||
89bddce5 | 2203 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
1da177e4 LT |
2204 | } |
2205 | ||
77d76ea3 | 2206 | static int __init sock_init(void) |
1da177e4 LT |
2207 | { |
2208 | /* | |
89bddce5 | 2209 | * Initialize sock SLAB cache. |
1da177e4 | 2210 | */ |
89bddce5 | 2211 | |
1da177e4 LT |
2212 | sk_init(); |
2213 | ||
1da177e4 | 2214 | /* |
89bddce5 | 2215 | * Initialize skbuff SLAB cache |
1da177e4 LT |
2216 | */ |
2217 | skb_init(); | |
1da177e4 LT |
2218 | |
2219 | /* | |
89bddce5 | 2220 | * Initialize the protocols module. |
1da177e4 LT |
2221 | */ |
2222 | ||
2223 | init_inodecache(); | |
2224 | register_filesystem(&sock_fs_type); | |
2225 | sock_mnt = kern_mount(&sock_fs_type); | |
77d76ea3 AK |
2226 | |
2227 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
2228 | */ |
2229 | ||
2230 | #ifdef CONFIG_NETFILTER | |
2231 | netfilter_init(); | |
2232 | #endif | |
cbeb321a DM |
2233 | |
2234 | return 0; | |
1da177e4 LT |
2235 | } |
2236 | ||
77d76ea3 AK |
2237 | core_initcall(sock_init); /* early initcall */ |
2238 | ||
1da177e4 LT |
2239 | #ifdef CONFIG_PROC_FS |
2240 | void socket_seq_show(struct seq_file *seq) | |
2241 | { | |
2242 | int cpu; | |
2243 | int counter = 0; | |
2244 | ||
6f912042 | 2245 | for_each_possible_cpu(cpu) |
89bddce5 | 2246 | counter += per_cpu(sockets_in_use, cpu); |
1da177e4 LT |
2247 | |
2248 | /* It can be negative, by the way. 8) */ | |
2249 | if (counter < 0) | |
2250 | counter = 0; | |
2251 | ||
2252 | seq_printf(seq, "sockets: used %d\n", counter); | |
2253 | } | |
89bddce5 | 2254 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 2255 | |
89bbfc95 SP |
2256 | #ifdef CONFIG_COMPAT |
2257 | static long compat_sock_ioctl(struct file *file, unsigned cmd, | |
89bddce5 | 2258 | unsigned long arg) |
89bbfc95 SP |
2259 | { |
2260 | struct socket *sock = file->private_data; | |
2261 | int ret = -ENOIOCTLCMD; | |
87de87d5 DM |
2262 | struct sock *sk; |
2263 | struct net *net; | |
2264 | ||
2265 | sk = sock->sk; | |
2266 | net = sock_net(sk); | |
89bbfc95 SP |
2267 | |
2268 | if (sock->ops->compat_ioctl) | |
2269 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
2270 | ||
87de87d5 DM |
2271 | if (ret == -ENOIOCTLCMD && |
2272 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
2273 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
2274 | ||
89bbfc95 SP |
2275 | return ret; |
2276 | } | |
2277 | #endif | |
2278 | ||
ac5a488e SS |
2279 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
2280 | { | |
2281 | return sock->ops->bind(sock, addr, addrlen); | |
2282 | } | |
2283 | ||
2284 | int kernel_listen(struct socket *sock, int backlog) | |
2285 | { | |
2286 | return sock->ops->listen(sock, backlog); | |
2287 | } | |
2288 | ||
2289 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
2290 | { | |
2291 | struct sock *sk = sock->sk; | |
2292 | int err; | |
2293 | ||
2294 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
2295 | newsock); | |
2296 | if (err < 0) | |
2297 | goto done; | |
2298 | ||
2299 | err = sock->ops->accept(sock, *newsock, flags); | |
2300 | if (err < 0) { | |
2301 | sock_release(*newsock); | |
fa8705b0 | 2302 | *newsock = NULL; |
ac5a488e SS |
2303 | goto done; |
2304 | } | |
2305 | ||
2306 | (*newsock)->ops = sock->ops; | |
1b08534e | 2307 | __module_get((*newsock)->ops->owner); |
ac5a488e SS |
2308 | |
2309 | done: | |
2310 | return err; | |
2311 | } | |
2312 | ||
2313 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
4768fbcb | 2314 | int flags) |
ac5a488e SS |
2315 | { |
2316 | return sock->ops->connect(sock, addr, addrlen, flags); | |
2317 | } | |
2318 | ||
2319 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
2320 | int *addrlen) | |
2321 | { | |
2322 | return sock->ops->getname(sock, addr, addrlen, 0); | |
2323 | } | |
2324 | ||
2325 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
2326 | int *addrlen) | |
2327 | { | |
2328 | return sock->ops->getname(sock, addr, addrlen, 1); | |
2329 | } | |
2330 | ||
2331 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
2332 | char *optval, int *optlen) | |
2333 | { | |
2334 | mm_segment_t oldfs = get_fs(); | |
2335 | int err; | |
2336 | ||
2337 | set_fs(KERNEL_DS); | |
2338 | if (level == SOL_SOCKET) | |
2339 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
2340 | else | |
2341 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
2342 | optlen); | |
2343 | set_fs(oldfs); | |
2344 | return err; | |
2345 | } | |
2346 | ||
2347 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
2348 | char *optval, int optlen) | |
2349 | { | |
2350 | mm_segment_t oldfs = get_fs(); | |
2351 | int err; | |
2352 | ||
2353 | set_fs(KERNEL_DS); | |
2354 | if (level == SOL_SOCKET) | |
2355 | err = sock_setsockopt(sock, level, optname, optval, optlen); | |
2356 | else | |
2357 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
2358 | optlen); | |
2359 | set_fs(oldfs); | |
2360 | return err; | |
2361 | } | |
2362 | ||
2363 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
2364 | size_t size, int flags) | |
2365 | { | |
2366 | if (sock->ops->sendpage) | |
2367 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
2368 | ||
2369 | return sock_no_sendpage(sock, page, offset, size, flags); | |
2370 | } | |
2371 | ||
2372 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
2373 | { | |
2374 | mm_segment_t oldfs = get_fs(); | |
2375 | int err; | |
2376 | ||
2377 | set_fs(KERNEL_DS); | |
2378 | err = sock->ops->ioctl(sock, cmd, arg); | |
2379 | set_fs(oldfs); | |
2380 | ||
2381 | return err; | |
2382 | } | |
2383 | ||
91cf45f0 TM |
2384 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
2385 | { | |
2386 | return sock->ops->shutdown(sock, how); | |
2387 | } | |
2388 | ||
1da177e4 LT |
2389 | EXPORT_SYMBOL(sock_create); |
2390 | EXPORT_SYMBOL(sock_create_kern); | |
2391 | EXPORT_SYMBOL(sock_create_lite); | |
2392 | EXPORT_SYMBOL(sock_map_fd); | |
2393 | EXPORT_SYMBOL(sock_recvmsg); | |
2394 | EXPORT_SYMBOL(sock_register); | |
2395 | EXPORT_SYMBOL(sock_release); | |
2396 | EXPORT_SYMBOL(sock_sendmsg); | |
2397 | EXPORT_SYMBOL(sock_unregister); | |
2398 | EXPORT_SYMBOL(sock_wake_async); | |
2399 | EXPORT_SYMBOL(sockfd_lookup); | |
2400 | EXPORT_SYMBOL(kernel_sendmsg); | |
2401 | EXPORT_SYMBOL(kernel_recvmsg); | |
ac5a488e SS |
2402 | EXPORT_SYMBOL(kernel_bind); |
2403 | EXPORT_SYMBOL(kernel_listen); | |
2404 | EXPORT_SYMBOL(kernel_accept); | |
2405 | EXPORT_SYMBOL(kernel_connect); | |
2406 | EXPORT_SYMBOL(kernel_getsockname); | |
2407 | EXPORT_SYMBOL(kernel_getpeername); | |
2408 | EXPORT_SYMBOL(kernel_getsockopt); | |
2409 | EXPORT_SYMBOL(kernel_setsockopt); | |
2410 | EXPORT_SYMBOL(kernel_sendpage); | |
2411 | EXPORT_SYMBOL(kernel_sock_ioctl); | |
91cf45f0 | 2412 | EXPORT_SYMBOL(kernel_sock_shutdown); |