Commit | Line | Data |
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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) | |
45 | * Tigran Aivazian : Made listen(2) backlog sanity checks | |
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 | |
56 | * paradigm. | |
57 | * | |
58 | * Based upon Swansea University Computer Society NET3.039 | |
59 | */ | |
60 | ||
61 | #include <linux/config.h> | |
62 | #include <linux/mm.h> | |
63 | #include <linux/smp_lock.h> | |
64 | #include <linux/socket.h> | |
65 | #include <linux/file.h> | |
66 | #include <linux/net.h> | |
67 | #include <linux/interrupt.h> | |
68 | #include <linux/netdevice.h> | |
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
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> | |
80 | #include <linux/divert.h> | |
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> |
1da177e4 LT |
87 | |
88 | #ifdef CONFIG_NET_RADIO | |
89 | #include <linux/wireless.h> /* Note : will define WIRELESS_EXT */ | |
90 | #endif /* CONFIG_NET_RADIO */ | |
91 | ||
92 | #include <asm/uaccess.h> | |
93 | #include <asm/unistd.h> | |
94 | ||
95 | #include <net/compat.h> | |
96 | ||
97 | #include <net/sock.h> | |
98 | #include <linux/netfilter.h> | |
99 | ||
100 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); | |
101 | static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf, | |
102 | size_t size, loff_t pos); | |
103 | static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf, | |
104 | size_t size, loff_t pos); | |
105 | static int sock_mmap(struct file *file, struct vm_area_struct * vma); | |
106 | ||
107 | static int sock_close(struct inode *inode, struct file *file); | |
108 | static unsigned int sock_poll(struct file *file, | |
109 | struct poll_table_struct *wait); | |
110 | static long sock_ioctl(struct file *file, | |
111 | unsigned int cmd, unsigned long arg); | |
112 | static int sock_fasync(int fd, struct file *filp, int on); | |
113 | static ssize_t sock_readv(struct file *file, const struct iovec *vector, | |
114 | unsigned long count, loff_t *ppos); | |
115 | static ssize_t sock_writev(struct file *file, const struct iovec *vector, | |
116 | unsigned long count, loff_t *ppos); | |
117 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
118 | int offset, size_t size, loff_t *ppos, int more); | |
119 | ||
120 | ||
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 | ||
126 | static struct file_operations socket_file_ops = { | |
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, | |
133 | .mmap = sock_mmap, | |
134 | .open = sock_no_open, /* special open code to disallow open via /proc */ | |
135 | .release = sock_close, | |
136 | .fasync = sock_fasync, | |
137 | .readv = sock_readv, | |
138 | .writev = sock_writev, | |
139 | .sendpage = sock_sendpage | |
140 | }; | |
141 | ||
142 | /* | |
143 | * The protocol list. Each protocol is registered in here. | |
144 | */ | |
145 | ||
146 | static struct net_proto_family *net_families[NPROTO]; | |
147 | ||
148 | #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) | |
149 | static atomic_t net_family_lockct = ATOMIC_INIT(0); | |
150 | static DEFINE_SPINLOCK(net_family_lock); | |
151 | ||
152 | /* The strategy is: modifications net_family vector are short, do not | |
153 | sleep and veeery rare, but read access should be free of any exclusive | |
154 | locks. | |
155 | */ | |
156 | ||
157 | static void net_family_write_lock(void) | |
158 | { | |
159 | spin_lock(&net_family_lock); | |
160 | while (atomic_read(&net_family_lockct) != 0) { | |
161 | spin_unlock(&net_family_lock); | |
162 | ||
163 | yield(); | |
164 | ||
165 | spin_lock(&net_family_lock); | |
166 | } | |
167 | } | |
168 | ||
169 | static __inline__ void net_family_write_unlock(void) | |
170 | { | |
171 | spin_unlock(&net_family_lock); | |
172 | } | |
173 | ||
174 | static __inline__ void net_family_read_lock(void) | |
175 | { | |
176 | atomic_inc(&net_family_lockct); | |
177 | spin_unlock_wait(&net_family_lock); | |
178 | } | |
179 | ||
180 | static __inline__ void net_family_read_unlock(void) | |
181 | { | |
182 | atomic_dec(&net_family_lockct); | |
183 | } | |
184 | ||
185 | #else | |
186 | #define net_family_write_lock() do { } while(0) | |
187 | #define net_family_write_unlock() do { } while(0) | |
188 | #define net_family_read_lock() do { } while(0) | |
189 | #define net_family_read_unlock() do { } while(0) | |
190 | #endif | |
191 | ||
192 | ||
193 | /* | |
194 | * Statistics counters of the socket lists | |
195 | */ | |
196 | ||
197 | static DEFINE_PER_CPU(int, sockets_in_use) = 0; | |
198 | ||
199 | /* | |
200 | * Support routines. Move socket addresses back and forth across the kernel/user | |
201 | * divide and look after the messy bits. | |
202 | */ | |
203 | ||
204 | #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - | |
205 | 16 for IP, 16 for IPX, | |
206 | 24 for IPv6, | |
207 | about 80 for AX.25 | |
208 | must be at least one bigger than | |
209 | the AF_UNIX size (see net/unix/af_unix.c | |
210 | :unix_mkname()). | |
211 | */ | |
212 | ||
213 | /** | |
214 | * move_addr_to_kernel - copy a socket address into kernel space | |
215 | * @uaddr: Address in user space | |
216 | * @kaddr: Address in kernel space | |
217 | * @ulen: Length in user space | |
218 | * | |
219 | * The address is copied into kernel space. If the provided address is | |
220 | * too long an error code of -EINVAL is returned. If the copy gives | |
221 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
222 | */ | |
223 | ||
224 | int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) | |
225 | { | |
226 | if(ulen<0||ulen>MAX_SOCK_ADDR) | |
227 | return -EINVAL; | |
228 | if(ulen==0) | |
229 | return 0; | |
230 | if(copy_from_user(kaddr,uaddr,ulen)) | |
231 | return -EFAULT; | |
3ec3b2fb | 232 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
233 | } |
234 | ||
235 | /** | |
236 | * move_addr_to_user - copy an address to user space | |
237 | * @kaddr: kernel space address | |
238 | * @klen: length of address in kernel | |
239 | * @uaddr: user space address | |
240 | * @ulen: pointer to user length field | |
241 | * | |
242 | * The value pointed to by ulen on entry is the buffer length available. | |
243 | * This is overwritten with the buffer space used. -EINVAL is returned | |
244 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
245 | * is returned if either the buffer or the length field are not | |
246 | * accessible. | |
247 | * After copying the data up to the limit the user specifies, the true | |
248 | * length of the data is written over the length limit the user | |
249 | * specified. Zero is returned for a success. | |
250 | */ | |
251 | ||
252 | int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen) | |
253 | { | |
254 | int err; | |
255 | int len; | |
256 | ||
257 | if((err=get_user(len, ulen))) | |
258 | return err; | |
259 | if(len>klen) | |
260 | len=klen; | |
261 | if(len<0 || len> MAX_SOCK_ADDR) | |
262 | return -EINVAL; | |
263 | if(len) | |
264 | { | |
265 | if(copy_to_user(uaddr,kaddr,len)) | |
266 | return -EFAULT; | |
267 | } | |
268 | /* | |
269 | * "fromlen shall refer to the value before truncation.." | |
270 | * 1003.1g | |
271 | */ | |
272 | return __put_user(klen, ulen); | |
273 | } | |
274 | ||
275 | #define SOCKFS_MAGIC 0x534F434B | |
276 | ||
ba89966c | 277 | static kmem_cache_t * sock_inode_cachep __read_mostly; |
1da177e4 LT |
278 | |
279 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
280 | { | |
281 | struct socket_alloc *ei; | |
282 | ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); | |
283 | if (!ei) | |
284 | return NULL; | |
285 | init_waitqueue_head(&ei->socket.wait); | |
286 | ||
287 | ei->socket.fasync_list = NULL; | |
288 | ei->socket.state = SS_UNCONNECTED; | |
289 | ei->socket.flags = 0; | |
290 | ei->socket.ops = NULL; | |
291 | ei->socket.sk = NULL; | |
292 | ei->socket.file = NULL; | |
293 | ei->socket.flags = 0; | |
294 | ||
295 | return &ei->vfs_inode; | |
296 | } | |
297 | ||
298 | static void sock_destroy_inode(struct inode *inode) | |
299 | { | |
300 | kmem_cache_free(sock_inode_cachep, | |
301 | container_of(inode, struct socket_alloc, vfs_inode)); | |
302 | } | |
303 | ||
304 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
305 | { | |
306 | struct socket_alloc *ei = (struct socket_alloc *) foo; | |
307 | ||
308 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
309 | SLAB_CTOR_CONSTRUCTOR) | |
310 | inode_init_once(&ei->vfs_inode); | |
311 | } | |
312 | ||
313 | static int init_inodecache(void) | |
314 | { | |
315 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
316 | sizeof(struct socket_alloc), | |
317 | 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, | |
318 | init_once, NULL); | |
319 | if (sock_inode_cachep == NULL) | |
320 | return -ENOMEM; | |
321 | return 0; | |
322 | } | |
323 | ||
324 | static struct super_operations sockfs_ops = { | |
325 | .alloc_inode = sock_alloc_inode, | |
326 | .destroy_inode =sock_destroy_inode, | |
327 | .statfs = simple_statfs, | |
328 | }; | |
329 | ||
330 | static struct super_block *sockfs_get_sb(struct file_system_type *fs_type, | |
331 | int flags, const char *dev_name, void *data) | |
332 | { | |
333 | return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC); | |
334 | } | |
335 | ||
ba89966c | 336 | static struct vfsmount *sock_mnt __read_mostly; |
1da177e4 LT |
337 | |
338 | static struct file_system_type sock_fs_type = { | |
339 | .name = "sockfs", | |
340 | .get_sb = sockfs_get_sb, | |
341 | .kill_sb = kill_anon_super, | |
342 | }; | |
343 | static int sockfs_delete_dentry(struct dentry *dentry) | |
344 | { | |
345 | return 1; | |
346 | } | |
347 | static struct dentry_operations sockfs_dentry_operations = { | |
348 | .d_delete = sockfs_delete_dentry, | |
349 | }; | |
350 | ||
351 | /* | |
352 | * Obtains the first available file descriptor and sets it up for use. | |
353 | * | |
354 | * This function creates file structure and maps it to fd space | |
355 | * of current process. On success it returns file descriptor | |
356 | * and file struct implicitly stored in sock->file. | |
357 | * Note that another thread may close file descriptor before we return | |
358 | * from this function. We use the fact that now we do not refer | |
359 | * to socket after mapping. If one day we will need it, this | |
360 | * function will increment ref. count on file by 1. | |
361 | * | |
362 | * In any case returned fd MAY BE not valid! | |
363 | * This race condition is unavoidable | |
364 | * with shared fd spaces, we cannot solve it inside kernel, | |
365 | * but we take care of internal coherence yet. | |
366 | */ | |
367 | ||
368 | int sock_map_fd(struct socket *sock) | |
369 | { | |
370 | int fd; | |
371 | struct qstr this; | |
372 | char name[32]; | |
373 | ||
374 | /* | |
375 | * Find a file descriptor suitable for return to the user. | |
376 | */ | |
377 | ||
378 | fd = get_unused_fd(); | |
379 | if (fd >= 0) { | |
380 | struct file *file = get_empty_filp(); | |
381 | ||
382 | if (!file) { | |
383 | put_unused_fd(fd); | |
384 | fd = -ENFILE; | |
385 | goto out; | |
386 | } | |
387 | ||
f31f5f05 | 388 | this.len = sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino); |
1da177e4 | 389 | this.name = name; |
1da177e4 LT |
390 | this.hash = SOCK_INODE(sock)->i_ino; |
391 | ||
392 | file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); | |
393 | if (!file->f_dentry) { | |
394 | put_filp(file); | |
395 | put_unused_fd(fd); | |
396 | fd = -ENOMEM; | |
397 | goto out; | |
398 | } | |
399 | file->f_dentry->d_op = &sockfs_dentry_operations; | |
400 | d_add(file->f_dentry, SOCK_INODE(sock)); | |
401 | file->f_vfsmnt = mntget(sock_mnt); | |
402 | file->f_mapping = file->f_dentry->d_inode->i_mapping; | |
403 | ||
404 | sock->file = file; | |
405 | file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; | |
406 | file->f_mode = FMODE_READ | FMODE_WRITE; | |
407 | file->f_flags = O_RDWR; | |
408 | file->f_pos = 0; | |
07dc3f07 | 409 | file->private_data = sock; |
1da177e4 LT |
410 | fd_install(fd, file); |
411 | } | |
412 | ||
413 | out: | |
414 | return fd; | |
415 | } | |
416 | ||
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; | |
433 | struct inode *inode; | |
434 | struct socket *sock; | |
435 | ||
436 | if (!(file = fget(fd))) | |
437 | { | |
438 | *err = -EBADF; | |
439 | return NULL; | |
440 | } | |
441 | ||
07dc3f07 BL |
442 | if (file->f_op == &socket_file_ops) |
443 | return file->private_data; /* set in sock_map_fd */ | |
444 | ||
1da177e4 LT |
445 | inode = file->f_dentry->d_inode; |
446 | if (!S_ISSOCK(inode->i_mode)) { | |
447 | *err = -ENOTSOCK; | |
448 | fput(file); | |
449 | return NULL; | |
450 | } | |
451 | ||
452 | sock = SOCKET_I(inode); | |
453 | if (sock->file != file) { | |
454 | printk(KERN_ERR "socki_lookup: socket file changed!\n"); | |
455 | sock->file = file; | |
456 | } | |
457 | return sock; | |
458 | } | |
459 | ||
460 | /** | |
461 | * sock_alloc - allocate a socket | |
462 | * | |
463 | * Allocate a new inode and socket object. The two are bound together | |
464 | * and initialised. The socket is then returned. If we are out of inodes | |
465 | * NULL is returned. | |
466 | */ | |
467 | ||
468 | static struct socket *sock_alloc(void) | |
469 | { | |
470 | struct inode * inode; | |
471 | struct socket * sock; | |
472 | ||
473 | inode = new_inode(sock_mnt->mnt_sb); | |
474 | if (!inode) | |
475 | return NULL; | |
476 | ||
477 | sock = SOCKET_I(inode); | |
478 | ||
479 | inode->i_mode = S_IFSOCK|S_IRWXUGO; | |
480 | inode->i_uid = current->fsuid; | |
481 | inode->i_gid = current->fsgid; | |
482 | ||
483 | get_cpu_var(sockets_in_use)++; | |
484 | put_cpu_var(sockets_in_use); | |
485 | return sock; | |
486 | } | |
487 | ||
488 | /* | |
489 | * In theory you can't get an open on this inode, but /proc provides | |
490 | * a back door. Remember to keep it shut otherwise you'll let the | |
491 | * creepy crawlies in. | |
492 | */ | |
493 | ||
494 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) | |
495 | { | |
496 | return -ENXIO; | |
497 | } | |
498 | ||
499 | struct file_operations bad_sock_fops = { | |
500 | .owner = THIS_MODULE, | |
501 | .open = sock_no_open, | |
502 | }; | |
503 | ||
504 | /** | |
505 | * sock_release - close a socket | |
506 | * @sock: socket to close | |
507 | * | |
508 | * The socket is released from the protocol stack if it has a release | |
509 | * callback, and the inode is then released if the socket is bound to | |
510 | * an inode not a file. | |
511 | */ | |
512 | ||
513 | void sock_release(struct socket *sock) | |
514 | { | |
515 | if (sock->ops) { | |
516 | struct module *owner = sock->ops->owner; | |
517 | ||
518 | sock->ops->release(sock); | |
519 | sock->ops = NULL; | |
520 | module_put(owner); | |
521 | } | |
522 | ||
523 | if (sock->fasync_list) | |
524 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); | |
525 | ||
526 | get_cpu_var(sockets_in_use)--; | |
527 | put_cpu_var(sockets_in_use); | |
528 | if (!sock->file) { | |
529 | iput(SOCK_INODE(sock)); | |
530 | return; | |
531 | } | |
532 | sock->file=NULL; | |
533 | } | |
534 | ||
535 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
536 | struct msghdr *msg, size_t size) | |
537 | { | |
538 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
539 | int err; | |
540 | ||
541 | si->sock = sock; | |
542 | si->scm = NULL; | |
543 | si->msg = msg; | |
544 | si->size = size; | |
545 | ||
546 | err = security_socket_sendmsg(sock, msg, size); | |
547 | if (err) | |
548 | return err; | |
549 | ||
550 | return sock->ops->sendmsg(iocb, sock, msg, size); | |
551 | } | |
552 | ||
553 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | |
554 | { | |
555 | struct kiocb iocb; | |
556 | struct sock_iocb siocb; | |
557 | int ret; | |
558 | ||
559 | init_sync_kiocb(&iocb, NULL); | |
560 | iocb.private = &siocb; | |
561 | ret = __sock_sendmsg(&iocb, sock, msg, size); | |
562 | if (-EIOCBQUEUED == ret) | |
563 | ret = wait_on_sync_kiocb(&iocb); | |
564 | return ret; | |
565 | } | |
566 | ||
567 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
568 | struct kvec *vec, size_t num, size_t size) | |
569 | { | |
570 | mm_segment_t oldfs = get_fs(); | |
571 | int result; | |
572 | ||
573 | set_fs(KERNEL_DS); | |
574 | /* | |
575 | * the following is safe, since for compiler definitions of kvec and | |
576 | * iovec are identical, yielding the same in-core layout and alignment | |
577 | */ | |
578 | msg->msg_iov = (struct iovec *)vec, | |
579 | msg->msg_iovlen = num; | |
580 | result = sock_sendmsg(sock, msg, size); | |
581 | set_fs(oldfs); | |
582 | return result; | |
583 | } | |
584 | ||
585 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
586 | struct msghdr *msg, size_t size, int flags) | |
587 | { | |
588 | int err; | |
589 | struct sock_iocb *si = kiocb_to_siocb(iocb); | |
590 | ||
591 | si->sock = sock; | |
592 | si->scm = NULL; | |
593 | si->msg = msg; | |
594 | si->size = size; | |
595 | si->flags = flags; | |
596 | ||
597 | err = security_socket_recvmsg(sock, msg, size, flags); | |
598 | if (err) | |
599 | return err; | |
600 | ||
601 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); | |
602 | } | |
603 | ||
604 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, | |
605 | size_t size, int flags) | |
606 | { | |
607 | struct kiocb iocb; | |
608 | struct sock_iocb siocb; | |
609 | int ret; | |
610 | ||
611 | init_sync_kiocb(&iocb, NULL); | |
612 | iocb.private = &siocb; | |
613 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); | |
614 | if (-EIOCBQUEUED == ret) | |
615 | ret = wait_on_sync_kiocb(&iocb); | |
616 | return ret; | |
617 | } | |
618 | ||
619 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, | |
620 | struct kvec *vec, size_t num, | |
621 | size_t size, int flags) | |
622 | { | |
623 | mm_segment_t oldfs = get_fs(); | |
624 | int result; | |
625 | ||
626 | set_fs(KERNEL_DS); | |
627 | /* | |
628 | * the following is safe, since for compiler definitions of kvec and | |
629 | * iovec are identical, yielding the same in-core layout and alignment | |
630 | */ | |
631 | msg->msg_iov = (struct iovec *)vec, | |
632 | msg->msg_iovlen = num; | |
633 | result = sock_recvmsg(sock, msg, size, flags); | |
634 | set_fs(oldfs); | |
635 | return result; | |
636 | } | |
637 | ||
638 | static void sock_aio_dtor(struct kiocb *iocb) | |
639 | { | |
640 | kfree(iocb->private); | |
641 | } | |
642 | ||
643 | /* | |
644 | * Read data from a socket. ubuf is a user mode pointer. We make sure the user | |
645 | * area ubuf...ubuf+size-1 is writable before asking the protocol. | |
646 | */ | |
647 | ||
648 | static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, | |
649 | size_t size, loff_t pos) | |
650 | { | |
651 | struct sock_iocb *x, siocb; | |
652 | struct socket *sock; | |
653 | int flags; | |
654 | ||
655 | if (pos != 0) | |
656 | return -ESPIPE; | |
657 | if (size==0) /* Match SYS5 behaviour */ | |
658 | return 0; | |
659 | ||
660 | if (is_sync_kiocb(iocb)) | |
661 | x = &siocb; | |
662 | else { | |
663 | x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL); | |
664 | if (!x) | |
665 | return -ENOMEM; | |
666 | iocb->ki_dtor = sock_aio_dtor; | |
667 | } | |
668 | iocb->private = x; | |
669 | x->kiocb = iocb; | |
b69aee04 | 670 | sock = iocb->ki_filp->private_data; |
1da177e4 LT |
671 | |
672 | x->async_msg.msg_name = NULL; | |
673 | x->async_msg.msg_namelen = 0; | |
674 | x->async_msg.msg_iov = &x->async_iov; | |
675 | x->async_msg.msg_iovlen = 1; | |
676 | x->async_msg.msg_control = NULL; | |
677 | x->async_msg.msg_controllen = 0; | |
678 | x->async_iov.iov_base = ubuf; | |
679 | x->async_iov.iov_len = size; | |
680 | flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
681 | ||
682 | return __sock_recvmsg(iocb, sock, &x->async_msg, size, flags); | |
683 | } | |
684 | ||
685 | ||
686 | /* | |
687 | * Write data to a socket. We verify that the user area ubuf..ubuf+size-1 | |
688 | * is readable by the user process. | |
689 | */ | |
690 | ||
691 | static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, | |
692 | size_t size, loff_t pos) | |
693 | { | |
694 | struct sock_iocb *x, siocb; | |
695 | struct socket *sock; | |
696 | ||
697 | if (pos != 0) | |
698 | return -ESPIPE; | |
699 | if(size==0) /* Match SYS5 behaviour */ | |
700 | return 0; | |
701 | ||
702 | if (is_sync_kiocb(iocb)) | |
703 | x = &siocb; | |
704 | else { | |
705 | x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL); | |
706 | if (!x) | |
707 | return -ENOMEM; | |
708 | iocb->ki_dtor = sock_aio_dtor; | |
709 | } | |
710 | iocb->private = x; | |
711 | x->kiocb = iocb; | |
b69aee04 | 712 | sock = iocb->ki_filp->private_data; |
1da177e4 LT |
713 | |
714 | x->async_msg.msg_name = NULL; | |
715 | x->async_msg.msg_namelen = 0; | |
716 | x->async_msg.msg_iov = &x->async_iov; | |
717 | x->async_msg.msg_iovlen = 1; | |
718 | x->async_msg.msg_control = NULL; | |
719 | x->async_msg.msg_controllen = 0; | |
720 | x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
721 | if (sock->type == SOCK_SEQPACKET) | |
722 | x->async_msg.msg_flags |= MSG_EOR; | |
723 | x->async_iov.iov_base = (void __user *)ubuf; | |
724 | x->async_iov.iov_len = size; | |
725 | ||
726 | return __sock_sendmsg(iocb, sock, &x->async_msg, size); | |
727 | } | |
728 | ||
20380731 ACM |
729 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
730 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 LT |
731 | { |
732 | struct socket *sock; | |
733 | int flags; | |
734 | ||
b69aee04 | 735 | sock = file->private_data; |
1da177e4 LT |
736 | |
737 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; | |
738 | if (more) | |
739 | flags |= MSG_MORE; | |
740 | ||
741 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
742 | } | |
743 | ||
b69aee04 | 744 | static int sock_readv_writev(int type, |
1da177e4 LT |
745 | struct file * file, const struct iovec * iov, |
746 | long count, size_t size) | |
747 | { | |
748 | struct msghdr msg; | |
749 | struct socket *sock; | |
750 | ||
b69aee04 | 751 | sock = file->private_data; |
1da177e4 LT |
752 | |
753 | msg.msg_name = NULL; | |
754 | msg.msg_namelen = 0; | |
755 | msg.msg_control = NULL; | |
756 | msg.msg_controllen = 0; | |
757 | msg.msg_iov = (struct iovec *) iov; | |
758 | msg.msg_iovlen = count; | |
759 | msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
760 | ||
761 | /* read() does a VERIFY_WRITE */ | |
762 | if (type == VERIFY_WRITE) | |
763 | return sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
764 | ||
765 | if (sock->type == SOCK_SEQPACKET) | |
766 | msg.msg_flags |= MSG_EOR; | |
767 | ||
768 | return sock_sendmsg(sock, &msg, size); | |
769 | } | |
770 | ||
771 | static ssize_t sock_readv(struct file *file, const struct iovec *vector, | |
772 | unsigned long count, loff_t *ppos) | |
773 | { | |
774 | size_t tot_len = 0; | |
775 | int i; | |
776 | for (i = 0 ; i < count ; i++) | |
777 | tot_len += vector[i].iov_len; | |
b69aee04 | 778 | return sock_readv_writev(VERIFY_WRITE, |
1da177e4 LT |
779 | file, vector, count, tot_len); |
780 | } | |
781 | ||
782 | static ssize_t sock_writev(struct file *file, const struct iovec *vector, | |
783 | unsigned long count, loff_t *ppos) | |
784 | { | |
785 | size_t tot_len = 0; | |
786 | int i; | |
787 | for (i = 0 ; i < count ; i++) | |
788 | tot_len += vector[i].iov_len; | |
b69aee04 | 789 | return sock_readv_writev(VERIFY_READ, |
1da177e4 LT |
790 | file, vector, count, tot_len); |
791 | } | |
792 | ||
793 | ||
794 | /* | |
795 | * Atomic setting of ioctl hooks to avoid race | |
796 | * with module unload. | |
797 | */ | |
798 | ||
799 | static DECLARE_MUTEX(br_ioctl_mutex); | |
800 | static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL; | |
801 | ||
802 | void brioctl_set(int (*hook)(unsigned int, void __user *)) | |
803 | { | |
804 | down(&br_ioctl_mutex); | |
805 | br_ioctl_hook = hook; | |
806 | up(&br_ioctl_mutex); | |
807 | } | |
808 | EXPORT_SYMBOL(brioctl_set); | |
809 | ||
810 | static DECLARE_MUTEX(vlan_ioctl_mutex); | |
811 | static int (*vlan_ioctl_hook)(void __user *arg); | |
812 | ||
813 | void vlan_ioctl_set(int (*hook)(void __user *)) | |
814 | { | |
815 | down(&vlan_ioctl_mutex); | |
816 | vlan_ioctl_hook = hook; | |
817 | up(&vlan_ioctl_mutex); | |
818 | } | |
819 | EXPORT_SYMBOL(vlan_ioctl_set); | |
820 | ||
821 | static DECLARE_MUTEX(dlci_ioctl_mutex); | |
822 | static int (*dlci_ioctl_hook)(unsigned int, void __user *); | |
823 | ||
824 | void dlci_ioctl_set(int (*hook)(unsigned int, void __user *)) | |
825 | { | |
826 | down(&dlci_ioctl_mutex); | |
827 | dlci_ioctl_hook = hook; | |
828 | up(&dlci_ioctl_mutex); | |
829 | } | |
830 | EXPORT_SYMBOL(dlci_ioctl_set); | |
831 | ||
832 | /* | |
833 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
834 | * what to do with it - that's up to the protocol still. | |
835 | */ | |
836 | ||
837 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
838 | { | |
839 | struct socket *sock; | |
840 | void __user *argp = (void __user *)arg; | |
841 | int pid, err; | |
842 | ||
b69aee04 | 843 | sock = file->private_data; |
1da177e4 LT |
844 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
845 | err = dev_ioctl(cmd, argp); | |
846 | } else | |
847 | #ifdef WIRELESS_EXT | |
848 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { | |
849 | err = dev_ioctl(cmd, argp); | |
850 | } else | |
851 | #endif /* WIRELESS_EXT */ | |
852 | switch (cmd) { | |
853 | case FIOSETOWN: | |
854 | case SIOCSPGRP: | |
855 | err = -EFAULT; | |
856 | if (get_user(pid, (int __user *)argp)) | |
857 | break; | |
858 | err = f_setown(sock->file, pid, 1); | |
859 | break; | |
860 | case FIOGETOWN: | |
861 | case SIOCGPGRP: | |
862 | err = put_user(sock->file->f_owner.pid, (int __user *)argp); | |
863 | break; | |
864 | case SIOCGIFBR: | |
865 | case SIOCSIFBR: | |
866 | case SIOCBRADDBR: | |
867 | case SIOCBRDELBR: | |
868 | err = -ENOPKG; | |
869 | if (!br_ioctl_hook) | |
870 | request_module("bridge"); | |
871 | ||
872 | down(&br_ioctl_mutex); | |
873 | if (br_ioctl_hook) | |
874 | err = br_ioctl_hook(cmd, argp); | |
875 | up(&br_ioctl_mutex); | |
876 | break; | |
877 | case SIOCGIFVLAN: | |
878 | case SIOCSIFVLAN: | |
879 | err = -ENOPKG; | |
880 | if (!vlan_ioctl_hook) | |
881 | request_module("8021q"); | |
882 | ||
883 | down(&vlan_ioctl_mutex); | |
884 | if (vlan_ioctl_hook) | |
885 | err = vlan_ioctl_hook(argp); | |
886 | up(&vlan_ioctl_mutex); | |
887 | break; | |
888 | case SIOCGIFDIVERT: | |
889 | case SIOCSIFDIVERT: | |
890 | /* Convert this to call through a hook */ | |
891 | err = divert_ioctl(cmd, argp); | |
892 | break; | |
893 | case SIOCADDDLCI: | |
894 | case SIOCDELDLCI: | |
895 | err = -ENOPKG; | |
896 | if (!dlci_ioctl_hook) | |
897 | request_module("dlci"); | |
898 | ||
899 | if (dlci_ioctl_hook) { | |
900 | down(&dlci_ioctl_mutex); | |
901 | err = dlci_ioctl_hook(cmd, argp); | |
902 | up(&dlci_ioctl_mutex); | |
903 | } | |
904 | break; | |
905 | default: | |
906 | err = sock->ops->ioctl(sock, cmd, arg); | |
907 | break; | |
908 | } | |
909 | return err; | |
910 | } | |
911 | ||
912 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
913 | { | |
914 | int err; | |
915 | struct socket *sock = NULL; | |
916 | ||
917 | err = security_socket_create(family, type, protocol, 1); | |
918 | if (err) | |
919 | goto out; | |
920 | ||
921 | sock = sock_alloc(); | |
922 | if (!sock) { | |
923 | err = -ENOMEM; | |
924 | goto out; | |
925 | } | |
926 | ||
927 | security_socket_post_create(sock, family, type, protocol, 1); | |
928 | sock->type = type; | |
929 | out: | |
930 | *res = sock; | |
931 | return err; | |
932 | } | |
933 | ||
934 | /* No kernel lock held - perfect */ | |
935 | static unsigned int sock_poll(struct file *file, poll_table * wait) | |
936 | { | |
937 | struct socket *sock; | |
938 | ||
939 | /* | |
940 | * We can't return errors to poll, so it's either yes or no. | |
941 | */ | |
b69aee04 | 942 | sock = file->private_data; |
1da177e4 LT |
943 | return sock->ops->poll(file, sock, wait); |
944 | } | |
945 | ||
946 | static int sock_mmap(struct file * file, struct vm_area_struct * vma) | |
947 | { | |
b69aee04 | 948 | struct socket *sock = file->private_data; |
1da177e4 LT |
949 | |
950 | return sock->ops->mmap(file, sock, vma); | |
951 | } | |
952 | ||
20380731 | 953 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
954 | { |
955 | /* | |
956 | * It was possible the inode is NULL we were | |
957 | * closing an unfinished socket. | |
958 | */ | |
959 | ||
960 | if (!inode) | |
961 | { | |
962 | printk(KERN_DEBUG "sock_close: NULL inode\n"); | |
963 | return 0; | |
964 | } | |
965 | sock_fasync(-1, filp, 0); | |
966 | sock_release(SOCKET_I(inode)); | |
967 | return 0; | |
968 | } | |
969 | ||
970 | /* | |
971 | * Update the socket async list | |
972 | * | |
973 | * Fasync_list locking strategy. | |
974 | * | |
975 | * 1. fasync_list is modified only under process context socket lock | |
976 | * i.e. under semaphore. | |
977 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
978 | * or under socket lock. | |
979 | * 3. fasync_list can be used from softirq context, so that | |
980 | * modification under socket lock have to be enhanced with | |
981 | * write_lock_bh(&sk->sk_callback_lock). | |
982 | * --ANK (990710) | |
983 | */ | |
984 | ||
985 | static int sock_fasync(int fd, struct file *filp, int on) | |
986 | { | |
987 | struct fasync_struct *fa, *fna=NULL, **prev; | |
988 | struct socket *sock; | |
989 | struct sock *sk; | |
990 | ||
991 | if (on) | |
992 | { | |
993 | fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); | |
994 | if(fna==NULL) | |
995 | return -ENOMEM; | |
996 | } | |
997 | ||
b69aee04 | 998 | sock = filp->private_data; |
1da177e4 LT |
999 | |
1000 | if ((sk=sock->sk) == NULL) { | |
1001 | kfree(fna); | |
1002 | return -EINVAL; | |
1003 | } | |
1004 | ||
1005 | lock_sock(sk); | |
1006 | ||
1007 | prev=&(sock->fasync_list); | |
1008 | ||
1009 | for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev) | |
1010 | if (fa->fa_file==filp) | |
1011 | break; | |
1012 | ||
1013 | if(on) | |
1014 | { | |
1015 | if(fa!=NULL) | |
1016 | { | |
1017 | write_lock_bh(&sk->sk_callback_lock); | |
1018 | fa->fa_fd=fd; | |
1019 | write_unlock_bh(&sk->sk_callback_lock); | |
1020 | ||
1021 | kfree(fna); | |
1022 | goto out; | |
1023 | } | |
1024 | fna->fa_file=filp; | |
1025 | fna->fa_fd=fd; | |
1026 | fna->magic=FASYNC_MAGIC; | |
1027 | fna->fa_next=sock->fasync_list; | |
1028 | write_lock_bh(&sk->sk_callback_lock); | |
1029 | sock->fasync_list=fna; | |
1030 | write_unlock_bh(&sk->sk_callback_lock); | |
1031 | } | |
1032 | else | |
1033 | { | |
1034 | if (fa!=NULL) | |
1035 | { | |
1036 | write_lock_bh(&sk->sk_callback_lock); | |
1037 | *prev=fa->fa_next; | |
1038 | write_unlock_bh(&sk->sk_callback_lock); | |
1039 | kfree(fa); | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | out: | |
1044 | release_sock(sock->sk); | |
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | /* This function may be called only under socket lock or callback_lock */ | |
1049 | ||
1050 | int sock_wake_async(struct socket *sock, int how, int band) | |
1051 | { | |
1052 | if (!sock || !sock->fasync_list) | |
1053 | return -1; | |
1054 | switch (how) | |
1055 | { | |
1056 | case 1: | |
1057 | ||
1058 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) | |
1059 | break; | |
1060 | goto call_kill; | |
1061 | case 2: | |
1062 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) | |
1063 | break; | |
1064 | /* fall through */ | |
1065 | case 0: | |
1066 | call_kill: | |
1067 | __kill_fasync(sock->fasync_list, SIGIO, band); | |
1068 | break; | |
1069 | case 3: | |
1070 | __kill_fasync(sock->fasync_list, SIGURG, band); | |
1071 | } | |
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | static int __sock_create(int family, int type, int protocol, struct socket **res, int kern) | |
1076 | { | |
1077 | int err; | |
1078 | struct socket *sock; | |
1079 | ||
1080 | /* | |
1081 | * Check protocol is in range | |
1082 | */ | |
1083 | if (family < 0 || family >= NPROTO) | |
1084 | return -EAFNOSUPPORT; | |
1085 | if (type < 0 || type >= SOCK_MAX) | |
1086 | return -EINVAL; | |
1087 | ||
1088 | /* Compatibility. | |
1089 | ||
1090 | This uglymoron is moved from INET layer to here to avoid | |
1091 | deadlock in module load. | |
1092 | */ | |
1093 | if (family == PF_INET && type == SOCK_PACKET) { | |
1094 | static int warned; | |
1095 | if (!warned) { | |
1096 | warned = 1; | |
1097 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm); | |
1098 | } | |
1099 | family = PF_PACKET; | |
1100 | } | |
1101 | ||
1102 | err = security_socket_create(family, type, protocol, kern); | |
1103 | if (err) | |
1104 | return err; | |
1105 | ||
1106 | #if defined(CONFIG_KMOD) | |
1107 | /* Attempt to load a protocol module if the find failed. | |
1108 | * | |
1109 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1110 | * requested real, full-featured networking support upon configuration. | |
1111 | * Otherwise module support will break! | |
1112 | */ | |
1113 | if (net_families[family]==NULL) | |
1114 | { | |
1115 | request_module("net-pf-%d",family); | |
1116 | } | |
1117 | #endif | |
1118 | ||
1119 | net_family_read_lock(); | |
1120 | if (net_families[family] == NULL) { | |
1121 | err = -EAFNOSUPPORT; | |
1122 | goto out; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Allocate the socket and allow the family to set things up. if | |
1127 | * the protocol is 0, the family is instructed to select an appropriate | |
1128 | * default. | |
1129 | */ | |
1130 | ||
1131 | if (!(sock = sock_alloc())) { | |
1132 | printk(KERN_WARNING "socket: no more sockets\n"); | |
1133 | err = -ENFILE; /* Not exactly a match, but its the | |
1134 | closest posix thing */ | |
1135 | goto out; | |
1136 | } | |
1137 | ||
1138 | sock->type = type; | |
1139 | ||
1140 | /* | |
1141 | * We will call the ->create function, that possibly is in a loadable | |
1142 | * module, so we have to bump that loadable module refcnt first. | |
1143 | */ | |
1144 | err = -EAFNOSUPPORT; | |
1145 | if (!try_module_get(net_families[family]->owner)) | |
1146 | goto out_release; | |
1147 | ||
1148 | if ((err = net_families[family]->create(sock, protocol)) < 0) | |
1149 | goto out_module_put; | |
1150 | /* | |
1151 | * Now to bump the refcnt of the [loadable] module that owns this | |
1152 | * socket at sock_release time we decrement its refcnt. | |
1153 | */ | |
1154 | if (!try_module_get(sock->ops->owner)) { | |
1155 | sock->ops = NULL; | |
1156 | goto out_module_put; | |
1157 | } | |
1158 | /* | |
1159 | * Now that we're done with the ->create function, the [loadable] | |
1160 | * module can have its refcnt decremented | |
1161 | */ | |
1162 | module_put(net_families[family]->owner); | |
1163 | *res = sock; | |
1164 | security_socket_post_create(sock, family, type, protocol, kern); | |
1165 | ||
1166 | out: | |
1167 | net_family_read_unlock(); | |
1168 | return err; | |
1169 | out_module_put: | |
1170 | module_put(net_families[family]->owner); | |
1171 | out_release: | |
1172 | sock_release(sock); | |
1173 | goto out; | |
1174 | } | |
1175 | ||
1176 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1177 | { | |
1178 | return __sock_create(family, type, protocol, res, 0); | |
1179 | } | |
1180 | ||
1181 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1182 | { | |
1183 | return __sock_create(family, type, protocol, res, 1); | |
1184 | } | |
1185 | ||
1186 | asmlinkage long sys_socket(int family, int type, int protocol) | |
1187 | { | |
1188 | int retval; | |
1189 | struct socket *sock; | |
1190 | ||
1191 | retval = sock_create(family, type, protocol, &sock); | |
1192 | if (retval < 0) | |
1193 | goto out; | |
1194 | ||
1195 | retval = sock_map_fd(sock); | |
1196 | if (retval < 0) | |
1197 | goto out_release; | |
1198 | ||
1199 | out: | |
1200 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1201 | return retval; | |
1202 | ||
1203 | out_release: | |
1204 | sock_release(sock); | |
1205 | return retval; | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * Create a pair of connected sockets. | |
1210 | */ | |
1211 | ||
1212 | asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec) | |
1213 | { | |
1214 | struct socket *sock1, *sock2; | |
1215 | int fd1, fd2, err; | |
1216 | ||
1217 | /* | |
1218 | * Obtain the first socket and check if the underlying protocol | |
1219 | * supports the socketpair call. | |
1220 | */ | |
1221 | ||
1222 | err = sock_create(family, type, protocol, &sock1); | |
1223 | if (err < 0) | |
1224 | goto out; | |
1225 | ||
1226 | err = sock_create(family, type, protocol, &sock2); | |
1227 | if (err < 0) | |
1228 | goto out_release_1; | |
1229 | ||
1230 | err = sock1->ops->socketpair(sock1, sock2); | |
1231 | if (err < 0) | |
1232 | goto out_release_both; | |
1233 | ||
1234 | fd1 = fd2 = -1; | |
1235 | ||
1236 | err = sock_map_fd(sock1); | |
1237 | if (err < 0) | |
1238 | goto out_release_both; | |
1239 | fd1 = err; | |
1240 | ||
1241 | err = sock_map_fd(sock2); | |
1242 | if (err < 0) | |
1243 | goto out_close_1; | |
1244 | fd2 = err; | |
1245 | ||
1246 | /* fd1 and fd2 may be already another descriptors. | |
1247 | * Not kernel problem. | |
1248 | */ | |
1249 | ||
1250 | err = put_user(fd1, &usockvec[0]); | |
1251 | if (!err) | |
1252 | err = put_user(fd2, &usockvec[1]); | |
1253 | if (!err) | |
1254 | return 0; | |
1255 | ||
1256 | sys_close(fd2); | |
1257 | sys_close(fd1); | |
1258 | return err; | |
1259 | ||
1260 | out_close_1: | |
1261 | sock_release(sock2); | |
1262 | sys_close(fd1); | |
1263 | return err; | |
1264 | ||
1265 | out_release_both: | |
1266 | sock_release(sock2); | |
1267 | out_release_1: | |
1268 | sock_release(sock1); | |
1269 | out: | |
1270 | return err; | |
1271 | } | |
1272 | ||
1273 | ||
1274 | /* | |
1275 | * Bind a name to a socket. Nothing much to do here since it's | |
1276 | * the protocol's responsibility to handle the local address. | |
1277 | * | |
1278 | * We move the socket address to kernel space before we call | |
1279 | * the protocol layer (having also checked the address is ok). | |
1280 | */ | |
1281 | ||
1282 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) | |
1283 | { | |
1284 | struct socket *sock; | |
1285 | char address[MAX_SOCK_ADDR]; | |
1286 | int err; | |
1287 | ||
1288 | if((sock = sockfd_lookup(fd,&err))!=NULL) | |
1289 | { | |
1290 | if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) { | |
1291 | err = security_socket_bind(sock, (struct sockaddr *)address, addrlen); | |
1292 | if (err) { | |
1293 | sockfd_put(sock); | |
1294 | return err; | |
1295 | } | |
1296 | err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen); | |
1297 | } | |
1298 | sockfd_put(sock); | |
1299 | } | |
1300 | return err; | |
1301 | } | |
1302 | ||
1303 | ||
1304 | /* | |
1305 | * Perform a listen. Basically, we allow the protocol to do anything | |
1306 | * necessary for a listen, and if that works, we mark the socket as | |
1307 | * ready for listening. | |
1308 | */ | |
1309 | ||
1310 | int sysctl_somaxconn = SOMAXCONN; | |
1311 | ||
1312 | asmlinkage long sys_listen(int fd, int backlog) | |
1313 | { | |
1314 | struct socket *sock; | |
1315 | int err; | |
1316 | ||
1317 | if ((sock = sockfd_lookup(fd, &err)) != NULL) { | |
1318 | if ((unsigned) backlog > sysctl_somaxconn) | |
1319 | backlog = sysctl_somaxconn; | |
1320 | ||
1321 | err = security_socket_listen(sock, backlog); | |
1322 | if (err) { | |
1323 | sockfd_put(sock); | |
1324 | return err; | |
1325 | } | |
1326 | ||
1327 | err=sock->ops->listen(sock, backlog); | |
1328 | sockfd_put(sock); | |
1329 | } | |
1330 | return err; | |
1331 | } | |
1332 | ||
1333 | ||
1334 | /* | |
1335 | * For accept, we attempt to create a new socket, set up the link | |
1336 | * with the client, wake up the client, then return the new | |
1337 | * connected fd. We collect the address of the connector in kernel | |
1338 | * space and move it to user at the very end. This is unclean because | |
1339 | * we open the socket then return an error. | |
1340 | * | |
1341 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1342 | * status to recvmsg. We need to add that support in a way thats | |
1343 | * clean when we restucture accept also. | |
1344 | */ | |
1345 | ||
1346 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen) | |
1347 | { | |
1348 | struct socket *sock, *newsock; | |
1349 | int err, len; | |
1350 | char address[MAX_SOCK_ADDR]; | |
1351 | ||
1352 | sock = sockfd_lookup(fd, &err); | |
1353 | if (!sock) | |
1354 | goto out; | |
1355 | ||
1356 | err = -ENFILE; | |
1357 | if (!(newsock = sock_alloc())) | |
1358 | goto out_put; | |
1359 | ||
1360 | newsock->type = sock->type; | |
1361 | newsock->ops = sock->ops; | |
1362 | ||
1363 | err = security_socket_accept(sock, newsock); | |
1364 | if (err) | |
1365 | goto out_release; | |
1366 | ||
1367 | /* | |
1368 | * We don't need try_module_get here, as the listening socket (sock) | |
1369 | * has the protocol module (sock->ops->owner) held. | |
1370 | */ | |
1371 | __module_get(newsock->ops->owner); | |
1372 | ||
1373 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); | |
1374 | if (err < 0) | |
1375 | goto out_release; | |
1376 | ||
1377 | if (upeer_sockaddr) { | |
1378 | if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) { | |
1379 | err = -ECONNABORTED; | |
1380 | goto out_release; | |
1381 | } | |
1382 | err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen); | |
1383 | if (err < 0) | |
1384 | goto out_release; | |
1385 | } | |
1386 | ||
1387 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1388 | ||
1389 | if ((err = sock_map_fd(newsock)) < 0) | |
1390 | goto out_release; | |
1391 | ||
1392 | security_socket_post_accept(sock, newsock); | |
1393 | ||
1394 | out_put: | |
1395 | sockfd_put(sock); | |
1396 | out: | |
1397 | return err; | |
1398 | out_release: | |
1399 | sock_release(newsock); | |
1400 | goto out_put; | |
1401 | } | |
1402 | ||
1403 | ||
1404 | /* | |
1405 | * Attempt to connect to a socket with the server address. The address | |
1406 | * is in user space so we verify it is OK and move it to kernel space. | |
1407 | * | |
1408 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1409 | * break bindings | |
1410 | * | |
1411 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1412 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1413 | * include the -EINPROGRESS status for such sockets. | |
1414 | */ | |
1415 | ||
1416 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) | |
1417 | { | |
1418 | struct socket *sock; | |
1419 | char address[MAX_SOCK_ADDR]; | |
1420 | int err; | |
1421 | ||
1422 | sock = sockfd_lookup(fd, &err); | |
1423 | if (!sock) | |
1424 | goto out; | |
1425 | err = move_addr_to_kernel(uservaddr, addrlen, address); | |
1426 | if (err < 0) | |
1427 | goto out_put; | |
1428 | ||
1429 | err = security_socket_connect(sock, (struct sockaddr *)address, addrlen); | |
1430 | if (err) | |
1431 | goto out_put; | |
1432 | ||
1433 | err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen, | |
1434 | sock->file->f_flags); | |
1435 | out_put: | |
1436 | sockfd_put(sock); | |
1437 | out: | |
1438 | return err; | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * Get the local address ('name') of a socket object. Move the obtained | |
1443 | * name to user space. | |
1444 | */ | |
1445 | ||
1446 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) | |
1447 | { | |
1448 | struct socket *sock; | |
1449 | char address[MAX_SOCK_ADDR]; | |
1450 | int len, err; | |
1451 | ||
1452 | sock = sockfd_lookup(fd, &err); | |
1453 | if (!sock) | |
1454 | goto out; | |
1455 | ||
1456 | err = security_socket_getsockname(sock); | |
1457 | if (err) | |
1458 | goto out_put; | |
1459 | ||
1460 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); | |
1461 | if (err) | |
1462 | goto out_put; | |
1463 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); | |
1464 | ||
1465 | out_put: | |
1466 | sockfd_put(sock); | |
1467 | out: | |
1468 | return err; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * Get the remote address ('name') of a socket object. Move the obtained | |
1473 | * name to user space. | |
1474 | */ | |
1475 | ||
1476 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) | |
1477 | { | |
1478 | struct socket *sock; | |
1479 | char address[MAX_SOCK_ADDR]; | |
1480 | int len, err; | |
1481 | ||
1482 | if ((sock = sockfd_lookup(fd, &err))!=NULL) | |
1483 | { | |
1484 | err = security_socket_getpeername(sock); | |
1485 | if (err) { | |
1486 | sockfd_put(sock); | |
1487 | return err; | |
1488 | } | |
1489 | ||
1490 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1); | |
1491 | if (!err) | |
1492 | err=move_addr_to_user(address,len, usockaddr, usockaddr_len); | |
1493 | sockfd_put(sock); | |
1494 | } | |
1495 | return err; | |
1496 | } | |
1497 | ||
1498 | /* | |
1499 | * Send a datagram to a given address. We move the address into kernel | |
1500 | * space and check the user space data area is readable before invoking | |
1501 | * the protocol. | |
1502 | */ | |
1503 | ||
1504 | asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags, | |
1505 | struct sockaddr __user *addr, int addr_len) | |
1506 | { | |
1507 | struct socket *sock; | |
1508 | char address[MAX_SOCK_ADDR]; | |
1509 | int err; | |
1510 | struct msghdr msg; | |
1511 | struct iovec iov; | |
1512 | ||
1513 | sock = sockfd_lookup(fd, &err); | |
1514 | if (!sock) | |
1515 | goto out; | |
1516 | iov.iov_base=buff; | |
1517 | iov.iov_len=len; | |
1518 | msg.msg_name=NULL; | |
1519 | msg.msg_iov=&iov; | |
1520 | msg.msg_iovlen=1; | |
1521 | msg.msg_control=NULL; | |
1522 | msg.msg_controllen=0; | |
1523 | msg.msg_namelen=0; | |
1524 | if(addr) | |
1525 | { | |
1526 | err = move_addr_to_kernel(addr, addr_len, address); | |
1527 | if (err < 0) | |
1528 | goto out_put; | |
1529 | msg.msg_name=address; | |
1530 | msg.msg_namelen=addr_len; | |
1531 | } | |
1532 | if (sock->file->f_flags & O_NONBLOCK) | |
1533 | flags |= MSG_DONTWAIT; | |
1534 | msg.msg_flags = flags; | |
1535 | err = sock_sendmsg(sock, &msg, len); | |
1536 | ||
1537 | out_put: | |
1538 | sockfd_put(sock); | |
1539 | out: | |
1540 | return err; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Send a datagram down a socket. | |
1545 | */ | |
1546 | ||
1547 | asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags) | |
1548 | { | |
1549 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1550 | } | |
1551 | ||
1552 | /* | |
1553 | * Receive a frame from the socket and optionally record the address of the | |
1554 | * sender. We verify the buffers are writable and if needed move the | |
1555 | * sender address from kernel to user space. | |
1556 | */ | |
1557 | ||
1558 | asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags, | |
1559 | struct sockaddr __user *addr, int __user *addr_len) | |
1560 | { | |
1561 | struct socket *sock; | |
1562 | struct iovec iov; | |
1563 | struct msghdr msg; | |
1564 | char address[MAX_SOCK_ADDR]; | |
1565 | int err,err2; | |
1566 | ||
1567 | sock = sockfd_lookup(fd, &err); | |
1568 | if (!sock) | |
1569 | goto out; | |
1570 | ||
1571 | msg.msg_control=NULL; | |
1572 | msg.msg_controllen=0; | |
1573 | msg.msg_iovlen=1; | |
1574 | msg.msg_iov=&iov; | |
1575 | iov.iov_len=size; | |
1576 | iov.iov_base=ubuf; | |
1577 | msg.msg_name=address; | |
1578 | msg.msg_namelen=MAX_SOCK_ADDR; | |
1579 | if (sock->file->f_flags & O_NONBLOCK) | |
1580 | flags |= MSG_DONTWAIT; | |
1581 | err=sock_recvmsg(sock, &msg, size, flags); | |
1582 | ||
1583 | if(err >= 0 && addr != NULL) | |
1584 | { | |
1585 | err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len); | |
1586 | if(err2<0) | |
1587 | err=err2; | |
1588 | } | |
1589 | sockfd_put(sock); | |
1590 | out: | |
1591 | return err; | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * Receive a datagram from a socket. | |
1596 | */ | |
1597 | ||
1598 | asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags) | |
1599 | { | |
1600 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1601 | } | |
1602 | ||
1603 | /* | |
1604 | * Set a socket option. Because we don't know the option lengths we have | |
1605 | * to pass the user mode parameter for the protocols to sort out. | |
1606 | */ | |
1607 | ||
1608 | asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen) | |
1609 | { | |
1610 | int err; | |
1611 | struct socket *sock; | |
1612 | ||
1613 | if (optlen < 0) | |
1614 | return -EINVAL; | |
1615 | ||
1616 | if ((sock = sockfd_lookup(fd, &err))!=NULL) | |
1617 | { | |
1618 | err = security_socket_setsockopt(sock,level,optname); | |
1619 | if (err) { | |
1620 | sockfd_put(sock); | |
1621 | return err; | |
1622 | } | |
1623 | ||
1624 | if (level == SOL_SOCKET) | |
1625 | err=sock_setsockopt(sock,level,optname,optval,optlen); | |
1626 | else | |
1627 | err=sock->ops->setsockopt(sock, level, optname, optval, optlen); | |
1628 | sockfd_put(sock); | |
1629 | } | |
1630 | return err; | |
1631 | } | |
1632 | ||
1633 | /* | |
1634 | * Get a socket option. Because we don't know the option lengths we have | |
1635 | * to pass a user mode parameter for the protocols to sort out. | |
1636 | */ | |
1637 | ||
1638 | asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen) | |
1639 | { | |
1640 | int err; | |
1641 | struct socket *sock; | |
1642 | ||
1643 | if ((sock = sockfd_lookup(fd, &err))!=NULL) | |
1644 | { | |
1645 | err = security_socket_getsockopt(sock, level, | |
1646 | optname); | |
1647 | if (err) { | |
1648 | sockfd_put(sock); | |
1649 | return err; | |
1650 | } | |
1651 | ||
1652 | if (level == SOL_SOCKET) | |
1653 | err=sock_getsockopt(sock,level,optname,optval,optlen); | |
1654 | else | |
1655 | err=sock->ops->getsockopt(sock, level, optname, optval, optlen); | |
1656 | sockfd_put(sock); | |
1657 | } | |
1658 | return err; | |
1659 | } | |
1660 | ||
1661 | ||
1662 | /* | |
1663 | * Shutdown a socket. | |
1664 | */ | |
1665 | ||
1666 | asmlinkage long sys_shutdown(int fd, int how) | |
1667 | { | |
1668 | int err; | |
1669 | struct socket *sock; | |
1670 | ||
1671 | if ((sock = sockfd_lookup(fd, &err))!=NULL) | |
1672 | { | |
1673 | err = security_socket_shutdown(sock, how); | |
1674 | if (err) { | |
1675 | sockfd_put(sock); | |
1676 | return err; | |
1677 | } | |
1678 | ||
1679 | err=sock->ops->shutdown(sock, how); | |
1680 | sockfd_put(sock); | |
1681 | } | |
1682 | return err; | |
1683 | } | |
1684 | ||
1685 | /* A couple of helpful macros for getting the address of the 32/64 bit | |
1686 | * fields which are the same type (int / unsigned) on our platforms. | |
1687 | */ | |
1688 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1689 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1690 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1691 | ||
1692 | ||
1693 | /* | |
1694 | * BSD sendmsg interface | |
1695 | */ | |
1696 | ||
1697 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
1698 | { | |
1699 | struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; | |
1700 | struct socket *sock; | |
1701 | char address[MAX_SOCK_ADDR]; | |
1702 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1703 | unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */ | |
1704 | unsigned char *ctl_buf = ctl; | |
1705 | struct msghdr msg_sys; | |
1706 | int err, ctl_len, iov_size, total_len; | |
1707 | ||
1708 | err = -EFAULT; | |
1709 | if (MSG_CMSG_COMPAT & flags) { | |
1710 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1711 | return -EFAULT; | |
1712 | } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) | |
1713 | return -EFAULT; | |
1714 | ||
1715 | sock = sockfd_lookup(fd, &err); | |
1716 | if (!sock) | |
1717 | goto out; | |
1718 | ||
1719 | /* do not move before msg_sys is valid */ | |
1720 | err = -EMSGSIZE; | |
1721 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1722 | goto out_put; | |
1723 | ||
1724 | /* Check whether to allocate the iovec area*/ | |
1725 | err = -ENOMEM; | |
1726 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1727 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1728 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1729 | if (!iov) | |
1730 | goto out_put; | |
1731 | } | |
1732 | ||
1733 | /* This will also move the address data into kernel space */ | |
1734 | if (MSG_CMSG_COMPAT & flags) { | |
1735 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); | |
1736 | } else | |
1737 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); | |
1738 | if (err < 0) | |
1739 | goto out_freeiov; | |
1740 | total_len = err; | |
1741 | ||
1742 | err = -ENOBUFS; | |
1743 | ||
1744 | if (msg_sys.msg_controllen > INT_MAX) | |
1745 | goto out_freeiov; | |
1746 | ctl_len = msg_sys.msg_controllen; | |
1747 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { | |
8920e8f9 | 1748 | err = cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, sizeof(ctl)); |
1da177e4 LT |
1749 | if (err) |
1750 | goto out_freeiov; | |
1751 | ctl_buf = msg_sys.msg_control; | |
8920e8f9 | 1752 | ctl_len = msg_sys.msg_controllen; |
1da177e4 LT |
1753 | } else if (ctl_len) { |
1754 | if (ctl_len > sizeof(ctl)) | |
1755 | { | |
1756 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); | |
1757 | if (ctl_buf == NULL) | |
1758 | goto out_freeiov; | |
1759 | } | |
1760 | err = -EFAULT; | |
1761 | /* | |
1762 | * Careful! Before this, msg_sys.msg_control contains a user pointer. | |
1763 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1764 | * checking falls down on this. | |
1765 | */ | |
1766 | if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len)) | |
1767 | goto out_freectl; | |
1768 | msg_sys.msg_control = ctl_buf; | |
1769 | } | |
1770 | msg_sys.msg_flags = flags; | |
1771 | ||
1772 | if (sock->file->f_flags & O_NONBLOCK) | |
1773 | msg_sys.msg_flags |= MSG_DONTWAIT; | |
1774 | err = sock_sendmsg(sock, &msg_sys, total_len); | |
1775 | ||
1776 | out_freectl: | |
1777 | if (ctl_buf != ctl) | |
1778 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); | |
1779 | out_freeiov: | |
1780 | if (iov != iovstack) | |
1781 | sock_kfree_s(sock->sk, iov, iov_size); | |
1782 | out_put: | |
1783 | sockfd_put(sock); | |
1784 | out: | |
1785 | return err; | |
1786 | } | |
1787 | ||
1788 | /* | |
1789 | * BSD recvmsg interface | |
1790 | */ | |
1791 | ||
1792 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags) | |
1793 | { | |
1794 | struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; | |
1795 | struct socket *sock; | |
1796 | struct iovec iovstack[UIO_FASTIOV]; | |
1797 | struct iovec *iov=iovstack; | |
1798 | struct msghdr msg_sys; | |
1799 | unsigned long cmsg_ptr; | |
1800 | int err, iov_size, total_len, len; | |
1801 | ||
1802 | /* kernel mode address */ | |
1803 | char addr[MAX_SOCK_ADDR]; | |
1804 | ||
1805 | /* user mode address pointers */ | |
1806 | struct sockaddr __user *uaddr; | |
1807 | int __user *uaddr_len; | |
1808 | ||
1809 | if (MSG_CMSG_COMPAT & flags) { | |
1810 | if (get_compat_msghdr(&msg_sys, msg_compat)) | |
1811 | return -EFAULT; | |
1812 | } else | |
1813 | if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) | |
1814 | return -EFAULT; | |
1815 | ||
1816 | sock = sockfd_lookup(fd, &err); | |
1817 | if (!sock) | |
1818 | goto out; | |
1819 | ||
1820 | err = -EMSGSIZE; | |
1821 | if (msg_sys.msg_iovlen > UIO_MAXIOV) | |
1822 | goto out_put; | |
1823 | ||
1824 | /* Check whether to allocate the iovec area*/ | |
1825 | err = -ENOMEM; | |
1826 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); | |
1827 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { | |
1828 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); | |
1829 | if (!iov) | |
1830 | goto out_put; | |
1831 | } | |
1832 | ||
1833 | /* | |
1834 | * Save the user-mode address (verify_iovec will change the | |
1835 | * kernel msghdr to use the kernel address space) | |
1836 | */ | |
1837 | ||
1838 | uaddr = (void __user *) msg_sys.msg_name; | |
1839 | uaddr_len = COMPAT_NAMELEN(msg); | |
1840 | if (MSG_CMSG_COMPAT & flags) { | |
1841 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1842 | } else | |
1843 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); | |
1844 | if (err < 0) | |
1845 | goto out_freeiov; | |
1846 | total_len=err; | |
1847 | ||
1848 | cmsg_ptr = (unsigned long)msg_sys.msg_control; | |
1849 | msg_sys.msg_flags = 0; | |
1850 | if (MSG_CMSG_COMPAT & flags) | |
1851 | msg_sys.msg_flags = MSG_CMSG_COMPAT; | |
1852 | ||
1853 | if (sock->file->f_flags & O_NONBLOCK) | |
1854 | flags |= MSG_DONTWAIT; | |
1855 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); | |
1856 | if (err < 0) | |
1857 | goto out_freeiov; | |
1858 | len = err; | |
1859 | ||
1860 | if (uaddr != NULL) { | |
1861 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len); | |
1862 | if (err < 0) | |
1863 | goto out_freeiov; | |
1864 | } | |
1865 | err = __put_user(msg_sys.msg_flags, COMPAT_FLAGS(msg)); | |
1866 | if (err) | |
1867 | goto out_freeiov; | |
1868 | if (MSG_CMSG_COMPAT & flags) | |
1869 | err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, | |
1870 | &msg_compat->msg_controllen); | |
1871 | else | |
1872 | err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, | |
1873 | &msg->msg_controllen); | |
1874 | if (err) | |
1875 | goto out_freeiov; | |
1876 | err = len; | |
1877 | ||
1878 | out_freeiov: | |
1879 | if (iov != iovstack) | |
1880 | sock_kfree_s(sock->sk, iov, iov_size); | |
1881 | out_put: | |
1882 | sockfd_put(sock); | |
1883 | out: | |
1884 | return err; | |
1885 | } | |
1886 | ||
1887 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
1888 | ||
1889 | /* Argument list sizes for sys_socketcall */ | |
1890 | #define AL(x) ((x) * sizeof(unsigned long)) | |
1891 | static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), | |
1892 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), | |
1893 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; | |
1894 | #undef AL | |
1895 | ||
1896 | /* | |
1897 | * System call vectors. | |
1898 | * | |
1899 | * Argument checking cleaned up. Saved 20% in size. | |
1900 | * This function doesn't need to set the kernel lock because | |
1901 | * it is set by the callees. | |
1902 | */ | |
1903 | ||
1904 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) | |
1905 | { | |
1906 | unsigned long a[6]; | |
1907 | unsigned long a0,a1; | |
1908 | int err; | |
1909 | ||
1910 | if(call<1||call>SYS_RECVMSG) | |
1911 | return -EINVAL; | |
1912 | ||
1913 | /* copy_from_user should be SMP safe. */ | |
1914 | if (copy_from_user(a, args, nargs[call])) | |
1915 | return -EFAULT; | |
3ec3b2fb | 1916 | |
4bcff1b3 | 1917 | err = audit_socketcall(nargs[call]/sizeof(unsigned long), a); |
3ec3b2fb DW |
1918 | if (err) |
1919 | return err; | |
1920 | ||
1da177e4 LT |
1921 | a0=a[0]; |
1922 | a1=a[1]; | |
1923 | ||
1924 | switch(call) | |
1925 | { | |
1926 | case SYS_SOCKET: | |
1927 | err = sys_socket(a0,a1,a[2]); | |
1928 | break; | |
1929 | case SYS_BIND: | |
1930 | err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]); | |
1931 | break; | |
1932 | case SYS_CONNECT: | |
1933 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
1934 | break; | |
1935 | case SYS_LISTEN: | |
1936 | err = sys_listen(a0,a1); | |
1937 | break; | |
1938 | case SYS_ACCEPT: | |
1939 | err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); | |
1940 | break; | |
1941 | case SYS_GETSOCKNAME: | |
1942 | err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); | |
1943 | break; | |
1944 | case SYS_GETPEERNAME: | |
1945 | err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); | |
1946 | break; | |
1947 | case SYS_SOCKETPAIR: | |
1948 | err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]); | |
1949 | break; | |
1950 | case SYS_SEND: | |
1951 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
1952 | break; | |
1953 | case SYS_SENDTO: | |
1954 | err = sys_sendto(a0,(void __user *)a1, a[2], a[3], | |
1955 | (struct sockaddr __user *)a[4], a[5]); | |
1956 | break; | |
1957 | case SYS_RECV: | |
1958 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
1959 | break; | |
1960 | case SYS_RECVFROM: | |
1961 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
1962 | (struct sockaddr __user *)a[4], (int __user *)a[5]); | |
1963 | break; | |
1964 | case SYS_SHUTDOWN: | |
1965 | err = sys_shutdown(a0,a1); | |
1966 | break; | |
1967 | case SYS_SETSOCKOPT: | |
1968 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
1969 | break; | |
1970 | case SYS_GETSOCKOPT: | |
1971 | err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]); | |
1972 | break; | |
1973 | case SYS_SENDMSG: | |
1974 | err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]); | |
1975 | break; | |
1976 | case SYS_RECVMSG: | |
1977 | err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]); | |
1978 | break; | |
1979 | default: | |
1980 | err = -EINVAL; | |
1981 | break; | |
1982 | } | |
1983 | return err; | |
1984 | } | |
1985 | ||
1986 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ | |
1987 | ||
1988 | /* | |
1989 | * This function is called by a protocol handler that wants to | |
1990 | * advertise its address family, and have it linked into the | |
1991 | * SOCKET module. | |
1992 | */ | |
1993 | ||
1994 | int sock_register(struct net_proto_family *ops) | |
1995 | { | |
1996 | int err; | |
1997 | ||
1998 | if (ops->family >= NPROTO) { | |
1999 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); | |
2000 | return -ENOBUFS; | |
2001 | } | |
2002 | net_family_write_lock(); | |
2003 | err = -EEXIST; | |
2004 | if (net_families[ops->family] == NULL) { | |
2005 | net_families[ops->family]=ops; | |
2006 | err = 0; | |
2007 | } | |
2008 | net_family_write_unlock(); | |
2009 | printk(KERN_INFO "NET: Registered protocol family %d\n", | |
2010 | ops->family); | |
2011 | return err; | |
2012 | } | |
2013 | ||
2014 | /* | |
2015 | * This function is called by a protocol handler that wants to | |
2016 | * remove its address family, and have it unlinked from the | |
2017 | * SOCKET module. | |
2018 | */ | |
2019 | ||
2020 | int sock_unregister(int family) | |
2021 | { | |
2022 | if (family < 0 || family >= NPROTO) | |
2023 | return -1; | |
2024 | ||
2025 | net_family_write_lock(); | |
2026 | net_families[family]=NULL; | |
2027 | net_family_write_unlock(); | |
2028 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", | |
2029 | family); | |
2030 | return 0; | |
2031 | } | |
2032 | ||
1da177e4 LT |
2033 | void __init sock_init(void) |
2034 | { | |
2035 | /* | |
2036 | * Initialize sock SLAB cache. | |
2037 | */ | |
2038 | ||
2039 | sk_init(); | |
2040 | ||
2041 | #ifdef SLAB_SKB | |
2042 | /* | |
2043 | * Initialize skbuff SLAB cache | |
2044 | */ | |
2045 | skb_init(); | |
2046 | #endif | |
2047 | ||
2048 | /* | |
2049 | * Initialize the protocols module. | |
2050 | */ | |
2051 | ||
2052 | init_inodecache(); | |
2053 | register_filesystem(&sock_fs_type); | |
2054 | sock_mnt = kern_mount(&sock_fs_type); | |
2055 | /* The real protocol initialization is performed when | |
2056 | * do_initcalls is run. | |
2057 | */ | |
2058 | ||
2059 | #ifdef CONFIG_NETFILTER | |
2060 | netfilter_init(); | |
2061 | #endif | |
2062 | } | |
2063 | ||
2064 | #ifdef CONFIG_PROC_FS | |
2065 | void socket_seq_show(struct seq_file *seq) | |
2066 | { | |
2067 | int cpu; | |
2068 | int counter = 0; | |
2069 | ||
2070 | for (cpu = 0; cpu < NR_CPUS; cpu++) | |
2071 | counter += per_cpu(sockets_in_use, cpu); | |
2072 | ||
2073 | /* It can be negative, by the way. 8) */ | |
2074 | if (counter < 0) | |
2075 | counter = 0; | |
2076 | ||
2077 | seq_printf(seq, "sockets: used %d\n", counter); | |
2078 | } | |
2079 | #endif /* CONFIG_PROC_FS */ | |
2080 | ||
2081 | /* ABI emulation layers need these two */ | |
2082 | EXPORT_SYMBOL(move_addr_to_kernel); | |
2083 | EXPORT_SYMBOL(move_addr_to_user); | |
2084 | EXPORT_SYMBOL(sock_create); | |
2085 | EXPORT_SYMBOL(sock_create_kern); | |
2086 | EXPORT_SYMBOL(sock_create_lite); | |
2087 | EXPORT_SYMBOL(sock_map_fd); | |
2088 | EXPORT_SYMBOL(sock_recvmsg); | |
2089 | EXPORT_SYMBOL(sock_register); | |
2090 | EXPORT_SYMBOL(sock_release); | |
2091 | EXPORT_SYMBOL(sock_sendmsg); | |
2092 | EXPORT_SYMBOL(sock_unregister); | |
2093 | EXPORT_SYMBOL(sock_wake_async); | |
2094 | EXPORT_SYMBOL(sockfd_lookup); | |
2095 | EXPORT_SYMBOL(kernel_sendmsg); | |
2096 | EXPORT_SYMBOL(kernel_recvmsg); |