Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/net/socket.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 50026 byte(s)
Tag kernel26-2.6.12-alx-r9
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> |
7 | * Ross Biro |
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> |
73 | #include <linux/init.h> |
74 | #include <linux/poll.h> |
75 | #include <linux/cache.h> |
76 | #include <linux/module.h> |
77 | #include <linux/highmem.h> |
78 | #include <linux/divert.h> |
79 | #include <linux/mount.h> |
80 | #include <linux/security.h> |
81 | #include <linux/syscalls.h> |
82 | #include <linux/compat.h> |
83 | #include <linux/kmod.h> |
84 | |
85 | #ifdef CONFIG_NET_RADIO |
86 | #include <linux/wireless.h> /* Note : will define WIRELESS_EXT */ |
87 | #endif /* CONFIG_NET_RADIO */ |
88 | |
89 | #include <asm/uaccess.h> |
90 | #include <asm/unistd.h> |
91 | |
92 | #include <net/compat.h> |
93 | |
94 | #include <net/sock.h> |
95 | #include <linux/netfilter.h> |
96 | |
97 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); |
98 | static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf, |
99 | size_t size, loff_t pos); |
100 | static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf, |
101 | size_t size, loff_t pos); |
102 | static int sock_mmap(struct file *file, struct vm_area_struct * vma); |
103 | |
104 | static int sock_close(struct inode *inode, struct file *file); |
105 | static unsigned int sock_poll(struct file *file, |
106 | struct poll_table_struct *wait); |
107 | static long sock_ioctl(struct file *file, |
108 | unsigned int cmd, unsigned long arg); |
109 | static int sock_fasync(int fd, struct file *filp, int on); |
110 | static ssize_t sock_readv(struct file *file, const struct iovec *vector, |
111 | unsigned long count, loff_t *ppos); |
112 | static ssize_t sock_writev(struct file *file, const struct iovec *vector, |
113 | unsigned long count, loff_t *ppos); |
114 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
115 | int offset, size_t size, loff_t *ppos, int more); |
116 | |
117 | |
118 | /* |
119 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear |
120 | * in the operation structures but are done directly via the socketcall() multiplexor. |
121 | */ |
122 | |
123 | static struct file_operations socket_file_ops = { |
124 | .owner = THIS_MODULE, |
125 | .llseek = no_llseek, |
126 | .aio_read = sock_aio_read, |
127 | .aio_write = sock_aio_write, |
128 | .poll = sock_poll, |
129 | .unlocked_ioctl = sock_ioctl, |
130 | .mmap = sock_mmap, |
131 | .open = sock_no_open, /* special open code to disallow open via /proc */ |
132 | .release = sock_close, |
133 | .fasync = sock_fasync, |
134 | .readv = sock_readv, |
135 | .writev = sock_writev, |
136 | .sendpage = sock_sendpage |
137 | }; |
138 | |
139 | /* |
140 | * The protocol list. Each protocol is registered in here. |
141 | */ |
142 | |
143 | static struct net_proto_family *net_families[NPROTO]; |
144 | |
145 | #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) |
146 | static atomic_t net_family_lockct = ATOMIC_INIT(0); |
147 | static DEFINE_SPINLOCK(net_family_lock); |
148 | |
149 | /* The strategy is: modifications net_family vector are short, do not |
150 | sleep and veeery rare, but read access should be free of any exclusive |
151 | locks. |
152 | */ |
153 | |
154 | static void net_family_write_lock(void) |
155 | { |
156 | spin_lock(&net_family_lock); |
157 | while (atomic_read(&net_family_lockct) != 0) { |
158 | spin_unlock(&net_family_lock); |
159 | |
160 | yield(); |
161 | |
162 | spin_lock(&net_family_lock); |
163 | } |
164 | } |
165 | |
166 | static __inline__ void net_family_write_unlock(void) |
167 | { |
168 | spin_unlock(&net_family_lock); |
169 | } |
170 | |
171 | static __inline__ void net_family_read_lock(void) |
172 | { |
173 | atomic_inc(&net_family_lockct); |
174 | spin_unlock_wait(&net_family_lock); |
175 | } |
176 | |
177 | static __inline__ void net_family_read_unlock(void) |
178 | { |
179 | atomic_dec(&net_family_lockct); |
180 | } |
181 | |
182 | #else |
183 | #define net_family_write_lock() do { } while(0) |
184 | #define net_family_write_unlock() do { } while(0) |
185 | #define net_family_read_lock() do { } while(0) |
186 | #define net_family_read_unlock() do { } while(0) |
187 | #endif |
188 | |
189 | |
190 | /* |
191 | * Statistics counters of the socket lists |
192 | */ |
193 | |
194 | static DEFINE_PER_CPU(int, sockets_in_use) = 0; |
195 | |
196 | /* |
197 | * Support routines. Move socket addresses back and forth across the kernel/user |
198 | * divide and look after the messy bits. |
199 | */ |
200 | |
201 | #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - |
202 | 16 for IP, 16 for IPX, |
203 | 24 for IPv6, |
204 | about 80 for AX.25 |
205 | must be at least one bigger than |
206 | the AF_UNIX size (see net/unix/af_unix.c |
207 | :unix_mkname()). |
208 | */ |
209 | |
210 | /** |
211 | * move_addr_to_kernel - copy a socket address into kernel space |
212 | * @uaddr: Address in user space |
213 | * @kaddr: Address in kernel space |
214 | * @ulen: Length in user space |
215 | * |
216 | * The address is copied into kernel space. If the provided address is |
217 | * too long an error code of -EINVAL is returned. If the copy gives |
218 | * invalid addresses -EFAULT is returned. On a success 0 is returned. |
219 | */ |
220 | |
221 | int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) |
222 | { |
223 | if(ulen<0||ulen>MAX_SOCK_ADDR) |
224 | return -EINVAL; |
225 | if(ulen==0) |
226 | return 0; |
227 | if(copy_from_user(kaddr,uaddr,ulen)) |
228 | return -EFAULT; |
229 | return 0; |
230 | } |
231 | |
232 | /** |
233 | * move_addr_to_user - copy an address to user space |
234 | * @kaddr: kernel space address |
235 | * @klen: length of address in kernel |
236 | * @uaddr: user space address |
237 | * @ulen: pointer to user length field |
238 | * |
239 | * The value pointed to by ulen on entry is the buffer length available. |
240 | * This is overwritten with the buffer space used. -EINVAL is returned |
241 | * if an overlong buffer is specified or a negative buffer size. -EFAULT |
242 | * is returned if either the buffer or the length field are not |
243 | * accessible. |
244 | * After copying the data up to the limit the user specifies, the true |
245 | * length of the data is written over the length limit the user |
246 | * specified. Zero is returned for a success. |
247 | */ |
248 | |
249 | int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen) |
250 | { |
251 | int err; |
252 | int len; |
253 | |
254 | if((err=get_user(len, ulen))) |
255 | return err; |
256 | if(len>klen) |
257 | len=klen; |
258 | if(len<0 || len> MAX_SOCK_ADDR) |
259 | return -EINVAL; |
260 | if(len) |
261 | { |
262 | if(copy_to_user(uaddr,kaddr,len)) |
263 | return -EFAULT; |
264 | } |
265 | /* |
266 | * "fromlen shall refer to the value before truncation.." |
267 | * 1003.1g |
268 | */ |
269 | return __put_user(klen, ulen); |
270 | } |
271 | |
272 | #define SOCKFS_MAGIC 0x534F434B |
273 | |
274 | static kmem_cache_t * sock_inode_cachep; |
275 | |
276 | static struct inode *sock_alloc_inode(struct super_block *sb) |
277 | { |
278 | struct socket_alloc *ei; |
279 | ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); |
280 | if (!ei) |
281 | return NULL; |
282 | init_waitqueue_head(&ei->socket.wait); |
283 | |
284 | ei->socket.fasync_list = NULL; |
285 | ei->socket.state = SS_UNCONNECTED; |
286 | ei->socket.flags = 0; |
287 | ei->socket.ops = NULL; |
288 | ei->socket.sk = NULL; |
289 | ei->socket.file = NULL; |
290 | ei->socket.flags = 0; |
291 | |
292 | return &ei->vfs_inode; |
293 | } |
294 | |
295 | static void sock_destroy_inode(struct inode *inode) |
296 | { |
297 | kmem_cache_free(sock_inode_cachep, |
298 | container_of(inode, struct socket_alloc, vfs_inode)); |
299 | } |
300 | |
301 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
302 | { |
303 | struct socket_alloc *ei = (struct socket_alloc *) foo; |
304 | |
305 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
306 | SLAB_CTOR_CONSTRUCTOR) |
307 | inode_init_once(&ei->vfs_inode); |
308 | } |
309 | |
310 | static int init_inodecache(void) |
311 | { |
312 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", |
313 | sizeof(struct socket_alloc), |
314 | 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, |
315 | init_once, NULL); |
316 | if (sock_inode_cachep == NULL) |
317 | return -ENOMEM; |
318 | return 0; |
319 | } |
320 | |
321 | static struct super_operations sockfs_ops = { |
322 | .alloc_inode = sock_alloc_inode, |
323 | .destroy_inode =sock_destroy_inode, |
324 | .statfs = simple_statfs, |
325 | }; |
326 | |
327 | static struct super_block *sockfs_get_sb(struct file_system_type *fs_type, |
328 | int flags, const char *dev_name, void *data) |
329 | { |
330 | return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC); |
331 | } |
332 | |
333 | static struct vfsmount *sock_mnt; |
334 | |
335 | static struct file_system_type sock_fs_type = { |
336 | .name = "sockfs", |
337 | .get_sb = sockfs_get_sb, |
338 | .kill_sb = kill_anon_super, |
339 | }; |
340 | static int sockfs_delete_dentry(struct dentry *dentry) |
341 | { |
342 | return 1; |
343 | } |
344 | static struct dentry_operations sockfs_dentry_operations = { |
345 | .d_delete = sockfs_delete_dentry, |
346 | }; |
347 | |
348 | /* |
349 | * Obtains the first available file descriptor and sets it up for use. |
350 | * |
351 | * This function creates file structure and maps it to fd space |
352 | * of current process. On success it returns file descriptor |
353 | * and file struct implicitly stored in sock->file. |
354 | * Note that another thread may close file descriptor before we return |
355 | * from this function. We use the fact that now we do not refer |
356 | * to socket after mapping. If one day we will need it, this |
357 | * function will increment ref. count on file by 1. |
358 | * |
359 | * In any case returned fd MAY BE not valid! |
360 | * This race condition is unavoidable |
361 | * with shared fd spaces, we cannot solve it inside kernel, |
362 | * but we take care of internal coherence yet. |
363 | */ |
364 | |
365 | int sock_map_fd(struct socket *sock) |
366 | { |
367 | int fd; |
368 | struct qstr this; |
369 | char name[32]; |
370 | |
371 | /* |
372 | * Find a file descriptor suitable for return to the user. |
373 | */ |
374 | |
375 | fd = get_unused_fd(); |
376 | if (fd >= 0) { |
377 | struct file *file = get_empty_filp(); |
378 | |
379 | if (!file) { |
380 | put_unused_fd(fd); |
381 | fd = -ENFILE; |
382 | goto out; |
383 | } |
384 | |
385 | sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino); |
386 | this.name = name; |
387 | this.len = strlen(name); |
388 | this.hash = SOCK_INODE(sock)->i_ino; |
389 | |
390 | file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); |
391 | if (!file->f_dentry) { |
392 | put_filp(file); |
393 | put_unused_fd(fd); |
394 | fd = -ENOMEM; |
395 | goto out; |
396 | } |
397 | file->f_dentry->d_op = &sockfs_dentry_operations; |
398 | d_add(file->f_dentry, SOCK_INODE(sock)); |
399 | file->f_vfsmnt = mntget(sock_mnt); |
400 | file->f_mapping = file->f_dentry->d_inode->i_mapping; |
401 | |
402 | sock->file = file; |
403 | file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; |
404 | file->f_mode = FMODE_READ | FMODE_WRITE; |
405 | file->f_flags = O_RDWR; |
406 | file->f_pos = 0; |
407 | fd_install(fd, file); |
408 | } |
409 | |
410 | out: |
411 | return fd; |
412 | } |
413 | |
414 | /** |
415 | * sockfd_lookup - Go from a file number to its socket slot |
416 | * @fd: file handle |
417 | * @err: pointer to an error code return |
418 | * |
419 | * The file handle passed in is locked and the socket it is bound |
420 | * too is returned. If an error occurs the err pointer is overwritten |
421 | * with a negative errno code and NULL is returned. The function checks |
422 | * for both invalid handles and passing a handle which is not a socket. |
423 | * |
424 | * On a success the socket object pointer is returned. |
425 | */ |
426 | |
427 | struct socket *sockfd_lookup(int fd, int *err) |
428 | { |
429 | struct file *file; |
430 | struct inode *inode; |
431 | struct socket *sock; |
432 | |
433 | if (!(file = fget(fd))) |
434 | { |
435 | *err = -EBADF; |
436 | return NULL; |
437 | } |
438 | |
439 | inode = file->f_dentry->d_inode; |
440 | if (!S_ISSOCK(inode->i_mode)) { |
441 | *err = -ENOTSOCK; |
442 | fput(file); |
443 | return NULL; |
444 | } |
445 | |
446 | sock = SOCKET_I(inode); |
447 | if (sock->file != file) { |
448 | printk(KERN_ERR "socki_lookup: socket file changed!\n"); |
449 | sock->file = file; |
450 | } |
451 | return sock; |
452 | } |
453 | |
454 | /** |
455 | * sock_alloc - allocate a socket |
456 | * |
457 | * Allocate a new inode and socket object. The two are bound together |
458 | * and initialised. The socket is then returned. If we are out of inodes |
459 | * NULL is returned. |
460 | */ |
461 | |
462 | static struct socket *sock_alloc(void) |
463 | { |
464 | struct inode * inode; |
465 | struct socket * sock; |
466 | |
467 | inode = new_inode(sock_mnt->mnt_sb); |
468 | if (!inode) |
469 | return NULL; |
470 | |
471 | sock = SOCKET_I(inode); |
472 | |
473 | inode->i_mode = S_IFSOCK|S_IRWXUGO; |
474 | inode->i_uid = current->fsuid; |
475 | inode->i_gid = current->fsgid; |
476 | |
477 | get_cpu_var(sockets_in_use)++; |
478 | put_cpu_var(sockets_in_use); |
479 | return sock; |
480 | } |
481 | |
482 | /* |
483 | * In theory you can't get an open on this inode, but /proc provides |
484 | * a back door. Remember to keep it shut otherwise you'll let the |
485 | * creepy crawlies in. |
486 | */ |
487 | |
488 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
489 | { |
490 | return -ENXIO; |
491 | } |
492 | |
493 | struct file_operations bad_sock_fops = { |
494 | .owner = THIS_MODULE, |
495 | .open = sock_no_open, |
496 | }; |
497 | |
498 | /** |
499 | * sock_release - close a socket |
500 | * @sock: socket to close |
501 | * |
502 | * The socket is released from the protocol stack if it has a release |
503 | * callback, and the inode is then released if the socket is bound to |
504 | * an inode not a file. |
505 | */ |
506 | |
507 | void sock_release(struct socket *sock) |
508 | { |
509 | if (sock->ops) { |
510 | struct module *owner = sock->ops->owner; |
511 | |
512 | sock->ops->release(sock); |
513 | sock->ops = NULL; |
514 | module_put(owner); |
515 | } |
516 | |
517 | if (sock->fasync_list) |
518 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); |
519 | |
520 | get_cpu_var(sockets_in_use)--; |
521 | put_cpu_var(sockets_in_use); |
522 | if (!sock->file) { |
523 | iput(SOCK_INODE(sock)); |
524 | return; |
525 | } |
526 | sock->file=NULL; |
527 | } |
528 | |
529 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
530 | struct msghdr *msg, size_t size) |
531 | { |
532 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
533 | int err; |
534 | |
535 | si->sock = sock; |
536 | si->scm = NULL; |
537 | si->msg = msg; |
538 | si->size = size; |
539 | |
540 | err = security_socket_sendmsg(sock, msg, size); |
541 | if (err) |
542 | return err; |
543 | |
544 | return sock->ops->sendmsg(iocb, sock, msg, size); |
545 | } |
546 | |
547 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
548 | { |
549 | struct kiocb iocb; |
550 | struct sock_iocb siocb; |
551 | int ret; |
552 | |
553 | init_sync_kiocb(&iocb, NULL); |
554 | iocb.private = &siocb; |
555 | ret = __sock_sendmsg(&iocb, sock, msg, size); |
556 | if (-EIOCBQUEUED == ret) |
557 | ret = wait_on_sync_kiocb(&iocb); |
558 | return ret; |
559 | } |
560 | |
561 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
562 | struct kvec *vec, size_t num, size_t size) |
563 | { |
564 | mm_segment_t oldfs = get_fs(); |
565 | int result; |
566 | |
567 | set_fs(KERNEL_DS); |
568 | /* |
569 | * the following is safe, since for compiler definitions of kvec and |
570 | * iovec are identical, yielding the same in-core layout and alignment |
571 | */ |
572 | msg->msg_iov = (struct iovec *)vec, |
573 | msg->msg_iovlen = num; |
574 | result = sock_sendmsg(sock, msg, size); |
575 | set_fs(oldfs); |
576 | return result; |
577 | } |
578 | |
579 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
580 | struct msghdr *msg, size_t size, int flags) |
581 | { |
582 | int err; |
583 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
584 | |
585 | si->sock = sock; |
586 | si->scm = NULL; |
587 | si->msg = msg; |
588 | si->size = size; |
589 | si->flags = flags; |
590 | |
591 | err = security_socket_recvmsg(sock, msg, size, flags); |
592 | if (err) |
593 | return err; |
594 | |
595 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); |
596 | } |
597 | |
598 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
599 | size_t size, int flags) |
600 | { |
601 | struct kiocb iocb; |
602 | struct sock_iocb siocb; |
603 | int ret; |
604 | |
605 | init_sync_kiocb(&iocb, NULL); |
606 | iocb.private = &siocb; |
607 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); |
608 | if (-EIOCBQUEUED == ret) |
609 | ret = wait_on_sync_kiocb(&iocb); |
610 | return ret; |
611 | } |
612 | |
613 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
614 | struct kvec *vec, size_t num, |
615 | size_t size, int flags) |
616 | { |
617 | mm_segment_t oldfs = get_fs(); |
618 | int result; |
619 | |
620 | set_fs(KERNEL_DS); |
621 | /* |
622 | * the following is safe, since for compiler definitions of kvec and |
623 | * iovec are identical, yielding the same in-core layout and alignment |
624 | */ |
625 | msg->msg_iov = (struct iovec *)vec, |
626 | msg->msg_iovlen = num; |
627 | result = sock_recvmsg(sock, msg, size, flags); |
628 | set_fs(oldfs); |
629 | return result; |
630 | } |
631 | |
632 | static void sock_aio_dtor(struct kiocb *iocb) |
633 | { |
634 | kfree(iocb->private); |
635 | } |
636 | |
637 | /* |
638 | * Read data from a socket. ubuf is a user mode pointer. We make sure the user |
639 | * area ubuf...ubuf+size-1 is writable before asking the protocol. |
640 | */ |
641 | |
642 | static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, |
643 | size_t size, loff_t pos) |
644 | { |
645 | struct sock_iocb *x, siocb; |
646 | struct socket *sock; |
647 | int flags; |
648 | |
649 | if (pos != 0) |
650 | return -ESPIPE; |
651 | if (size==0) /* Match SYS5 behaviour */ |
652 | return 0; |
653 | |
654 | if (is_sync_kiocb(iocb)) |
655 | x = &siocb; |
656 | else { |
657 | x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL); |
658 | if (!x) |
659 | return -ENOMEM; |
660 | iocb->ki_dtor = sock_aio_dtor; |
661 | } |
662 | iocb->private = x; |
663 | x->kiocb = iocb; |
664 | sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); |
665 | |
666 | x->async_msg.msg_name = NULL; |
667 | x->async_msg.msg_namelen = 0; |
668 | x->async_msg.msg_iov = &x->async_iov; |
669 | x->async_msg.msg_iovlen = 1; |
670 | x->async_msg.msg_control = NULL; |
671 | x->async_msg.msg_controllen = 0; |
672 | x->async_iov.iov_base = ubuf; |
673 | x->async_iov.iov_len = size; |
674 | flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
675 | |
676 | return __sock_recvmsg(iocb, sock, &x->async_msg, size, flags); |
677 | } |
678 | |
679 | |
680 | /* |
681 | * Write data to a socket. We verify that the user area ubuf..ubuf+size-1 |
682 | * is readable by the user process. |
683 | */ |
684 | |
685 | static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, |
686 | size_t size, loff_t pos) |
687 | { |
688 | struct sock_iocb *x, siocb; |
689 | struct socket *sock; |
690 | |
691 | if (pos != 0) |
692 | return -ESPIPE; |
693 | if(size==0) /* Match SYS5 behaviour */ |
694 | return 0; |
695 | |
696 | if (is_sync_kiocb(iocb)) |
697 | x = &siocb; |
698 | else { |
699 | x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL); |
700 | if (!x) |
701 | return -ENOMEM; |
702 | iocb->ki_dtor = sock_aio_dtor; |
703 | } |
704 | iocb->private = x; |
705 | x->kiocb = iocb; |
706 | sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); |
707 | |
708 | x->async_msg.msg_name = NULL; |
709 | x->async_msg.msg_namelen = 0; |
710 | x->async_msg.msg_iov = &x->async_iov; |
711 | x->async_msg.msg_iovlen = 1; |
712 | x->async_msg.msg_control = NULL; |
713 | x->async_msg.msg_controllen = 0; |
714 | x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
715 | if (sock->type == SOCK_SEQPACKET) |
716 | x->async_msg.msg_flags |= MSG_EOR; |
717 | x->async_iov.iov_base = (void __user *)ubuf; |
718 | x->async_iov.iov_len = size; |
719 | |
720 | return __sock_sendmsg(iocb, sock, &x->async_msg, size); |
721 | } |
722 | |
723 | ssize_t sock_sendpage(struct file *file, struct page *page, |
724 | int offset, size_t size, loff_t *ppos, int more) |
725 | { |
726 | struct socket *sock; |
727 | int flags; |
728 | |
729 | sock = SOCKET_I(file->f_dentry->d_inode); |
730 | |
731 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
732 | if (more) |
733 | flags |= MSG_MORE; |
734 | |
735 | return sock->ops->sendpage(sock, page, offset, size, flags); |
736 | } |
737 | |
738 | static int sock_readv_writev(int type, struct inode * inode, |
739 | struct file * file, const struct iovec * iov, |
740 | long count, size_t size) |
741 | { |
742 | struct msghdr msg; |
743 | struct socket *sock; |
744 | |
745 | sock = SOCKET_I(inode); |
746 | |
747 | msg.msg_name = NULL; |
748 | msg.msg_namelen = 0; |
749 | msg.msg_control = NULL; |
750 | msg.msg_controllen = 0; |
751 | msg.msg_iov = (struct iovec *) iov; |
752 | msg.msg_iovlen = count; |
753 | msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
754 | |
755 | /* read() does a VERIFY_WRITE */ |
756 | if (type == VERIFY_WRITE) |
757 | return sock_recvmsg(sock, &msg, size, msg.msg_flags); |
758 | |
759 | if (sock->type == SOCK_SEQPACKET) |
760 | msg.msg_flags |= MSG_EOR; |
761 | |
762 | return sock_sendmsg(sock, &msg, size); |
763 | } |
764 | |
765 | static ssize_t sock_readv(struct file *file, const struct iovec *vector, |
766 | unsigned long count, loff_t *ppos) |
767 | { |
768 | size_t tot_len = 0; |
769 | int i; |
770 | for (i = 0 ; i < count ; i++) |
771 | tot_len += vector[i].iov_len; |
772 | return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode, |
773 | file, vector, count, tot_len); |
774 | } |
775 | |
776 | static ssize_t sock_writev(struct file *file, const struct iovec *vector, |
777 | unsigned long count, loff_t *ppos) |
778 | { |
779 | size_t tot_len = 0; |
780 | int i; |
781 | for (i = 0 ; i < count ; i++) |
782 | tot_len += vector[i].iov_len; |
783 | return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode, |
784 | file, vector, count, tot_len); |
785 | } |
786 | |
787 | |
788 | /* |
789 | * Atomic setting of ioctl hooks to avoid race |
790 | * with module unload. |
791 | */ |
792 | |
793 | static DECLARE_MUTEX(br_ioctl_mutex); |
794 | static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL; |
795 | |
796 | void brioctl_set(int (*hook)(unsigned int, void __user *)) |
797 | { |
798 | down(&br_ioctl_mutex); |
799 | br_ioctl_hook = hook; |
800 | up(&br_ioctl_mutex); |
801 | } |
802 | EXPORT_SYMBOL(brioctl_set); |
803 | |
804 | static DECLARE_MUTEX(vlan_ioctl_mutex); |
805 | static int (*vlan_ioctl_hook)(void __user *arg); |
806 | |
807 | void vlan_ioctl_set(int (*hook)(void __user *)) |
808 | { |
809 | down(&vlan_ioctl_mutex); |
810 | vlan_ioctl_hook = hook; |
811 | up(&vlan_ioctl_mutex); |
812 | } |
813 | EXPORT_SYMBOL(vlan_ioctl_set); |
814 | |
815 | static DECLARE_MUTEX(dlci_ioctl_mutex); |
816 | static int (*dlci_ioctl_hook)(unsigned int, void __user *); |
817 | |
818 | void dlci_ioctl_set(int (*hook)(unsigned int, void __user *)) |
819 | { |
820 | down(&dlci_ioctl_mutex); |
821 | dlci_ioctl_hook = hook; |
822 | up(&dlci_ioctl_mutex); |
823 | } |
824 | EXPORT_SYMBOL(dlci_ioctl_set); |
825 | |
826 | /* |
827 | * With an ioctl, arg may well be a user mode pointer, but we don't know |
828 | * what to do with it - that's up to the protocol still. |
829 | */ |
830 | |
831 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
832 | { |
833 | struct socket *sock; |
834 | void __user *argp = (void __user *)arg; |
835 | int pid, err; |
836 | |
837 | sock = SOCKET_I(file->f_dentry->d_inode); |
838 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
839 | err = dev_ioctl(cmd, argp); |
840 | } else |
841 | #ifdef WIRELESS_EXT |
842 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
843 | err = dev_ioctl(cmd, argp); |
844 | } else |
845 | #endif /* WIRELESS_EXT */ |
846 | switch (cmd) { |
847 | case FIOSETOWN: |
848 | case SIOCSPGRP: |
849 | err = -EFAULT; |
850 | if (get_user(pid, (int __user *)argp)) |
851 | break; |
852 | err = f_setown(sock->file, pid, 1); |
853 | break; |
854 | case FIOGETOWN: |
855 | case SIOCGPGRP: |
856 | err = put_user(sock->file->f_owner.pid, (int __user *)argp); |
857 | break; |
858 | case SIOCGIFBR: |
859 | case SIOCSIFBR: |
860 | case SIOCBRADDBR: |
861 | case SIOCBRDELBR: |
862 | err = -ENOPKG; |
863 | if (!br_ioctl_hook) |
864 | request_module("bridge"); |
865 | |
866 | down(&br_ioctl_mutex); |
867 | if (br_ioctl_hook) |
868 | err = br_ioctl_hook(cmd, argp); |
869 | up(&br_ioctl_mutex); |
870 | break; |
871 | case SIOCGIFVLAN: |
872 | case SIOCSIFVLAN: |
873 | err = -ENOPKG; |
874 | if (!vlan_ioctl_hook) |
875 | request_module("8021q"); |
876 | |
877 | down(&vlan_ioctl_mutex); |
878 | if (vlan_ioctl_hook) |
879 | err = vlan_ioctl_hook(argp); |
880 | up(&vlan_ioctl_mutex); |
881 | break; |
882 | case SIOCGIFDIVERT: |
883 | case SIOCSIFDIVERT: |
884 | /* Convert this to call through a hook */ |
885 | err = divert_ioctl(cmd, argp); |
886 | break; |
887 | case SIOCADDDLCI: |
888 | case SIOCDELDLCI: |
889 | err = -ENOPKG; |
890 | if (!dlci_ioctl_hook) |
891 | request_module("dlci"); |
892 | |
893 | if (dlci_ioctl_hook) { |
894 | down(&dlci_ioctl_mutex); |
895 | err = dlci_ioctl_hook(cmd, argp); |
896 | up(&dlci_ioctl_mutex); |
897 | } |
898 | break; |
899 | default: |
900 | err = sock->ops->ioctl(sock, cmd, arg); |
901 | break; |
902 | } |
903 | return err; |
904 | } |
905 | |
906 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
907 | { |
908 | int err; |
909 | struct socket *sock = NULL; |
910 | |
911 | err = security_socket_create(family, type, protocol, 1); |
912 | if (err) |
913 | goto out; |
914 | |
915 | sock = sock_alloc(); |
916 | if (!sock) { |
917 | err = -ENOMEM; |
918 | goto out; |
919 | } |
920 | |
921 | security_socket_post_create(sock, family, type, protocol, 1); |
922 | sock->type = type; |
923 | out: |
924 | *res = sock; |
925 | return err; |
926 | } |
927 | |
928 | /* No kernel lock held - perfect */ |
929 | static unsigned int sock_poll(struct file *file, poll_table * wait) |
930 | { |
931 | struct socket *sock; |
932 | |
933 | /* |
934 | * We can't return errors to poll, so it's either yes or no. |
935 | */ |
936 | sock = SOCKET_I(file->f_dentry->d_inode); |
937 | return sock->ops->poll(file, sock, wait); |
938 | } |
939 | |
940 | static int sock_mmap(struct file * file, struct vm_area_struct * vma) |
941 | { |
942 | struct socket *sock = SOCKET_I(file->f_dentry->d_inode); |
943 | |
944 | return sock->ops->mmap(file, sock, vma); |
945 | } |
946 | |
947 | int sock_close(struct inode *inode, struct file *filp) |
948 | { |
949 | /* |
950 | * It was possible the inode is NULL we were |
951 | * closing an unfinished socket. |
952 | */ |
953 | |
954 | if (!inode) |
955 | { |
956 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
957 | return 0; |
958 | } |
959 | sock_fasync(-1, filp, 0); |
960 | sock_release(SOCKET_I(inode)); |
961 | return 0; |
962 | } |
963 | |
964 | /* |
965 | * Update the socket async list |
966 | * |
967 | * Fasync_list locking strategy. |
968 | * |
969 | * 1. fasync_list is modified only under process context socket lock |
970 | * i.e. under semaphore. |
971 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) |
972 | * or under socket lock. |
973 | * 3. fasync_list can be used from softirq context, so that |
974 | * modification under socket lock have to be enhanced with |
975 | * write_lock_bh(&sk->sk_callback_lock). |
976 | * --ANK (990710) |
977 | */ |
978 | |
979 | static int sock_fasync(int fd, struct file *filp, int on) |
980 | { |
981 | struct fasync_struct *fa, *fna=NULL, **prev; |
982 | struct socket *sock; |
983 | struct sock *sk; |
984 | |
985 | if (on) |
986 | { |
987 | fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
988 | if(fna==NULL) |
989 | return -ENOMEM; |
990 | } |
991 | |
992 | sock = SOCKET_I(filp->f_dentry->d_inode); |
993 | |
994 | if ((sk=sock->sk) == NULL) { |
995 | kfree(fna); |
996 | return -EINVAL; |
997 | } |
998 | |
999 | lock_sock(sk); |
1000 | |
1001 | prev=&(sock->fasync_list); |
1002 | |
1003 | for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev) |
1004 | if (fa->fa_file==filp) |
1005 | break; |
1006 | |
1007 | if(on) |
1008 | { |
1009 | if(fa!=NULL) |
1010 | { |
1011 | write_lock_bh(&sk->sk_callback_lock); |
1012 | fa->fa_fd=fd; |
1013 | write_unlock_bh(&sk->sk_callback_lock); |
1014 | |
1015 | kfree(fna); |
1016 | goto out; |
1017 | } |
1018 | fna->fa_file=filp; |
1019 | fna->fa_fd=fd; |
1020 | fna->magic=FASYNC_MAGIC; |
1021 | fna->fa_next=sock->fasync_list; |
1022 | write_lock_bh(&sk->sk_callback_lock); |
1023 | sock->fasync_list=fna; |
1024 | write_unlock_bh(&sk->sk_callback_lock); |
1025 | } |
1026 | else |
1027 | { |
1028 | if (fa!=NULL) |
1029 | { |
1030 | write_lock_bh(&sk->sk_callback_lock); |
1031 | *prev=fa->fa_next; |
1032 | write_unlock_bh(&sk->sk_callback_lock); |
1033 | kfree(fa); |
1034 | } |
1035 | } |
1036 | |
1037 | out: |
1038 | release_sock(sock->sk); |
1039 | return 0; |
1040 | } |
1041 | |
1042 | /* This function may be called only under socket lock or callback_lock */ |
1043 | |
1044 | int sock_wake_async(struct socket *sock, int how, int band) |
1045 | { |
1046 | if (!sock || !sock->fasync_list) |
1047 | return -1; |
1048 | switch (how) |
1049 | { |
1050 | case 1: |
1051 | |
1052 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1053 | break; |
1054 | goto call_kill; |
1055 | case 2: |
1056 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
1057 | break; |
1058 | /* fall through */ |
1059 | case 0: |
1060 | call_kill: |
1061 | __kill_fasync(sock->fasync_list, SIGIO, band); |
1062 | break; |
1063 | case 3: |
1064 | __kill_fasync(sock->fasync_list, SIGURG, band); |
1065 | } |
1066 | return 0; |
1067 | } |
1068 | |
1069 | static int __sock_create(int family, int type, int protocol, struct socket **res, int kern) |
1070 | { |
1071 | int err; |
1072 | struct socket *sock; |
1073 | |
1074 | /* |
1075 | * Check protocol is in range |
1076 | */ |
1077 | if (family < 0 || family >= NPROTO) |
1078 | return -EAFNOSUPPORT; |
1079 | if (type < 0 || type >= SOCK_MAX) |
1080 | return -EINVAL; |
1081 | |
1082 | /* Compatibility. |
1083 | |
1084 | This uglymoron is moved from INET layer to here to avoid |
1085 | deadlock in module load. |
1086 | */ |
1087 | if (family == PF_INET && type == SOCK_PACKET) { |
1088 | static int warned; |
1089 | if (!warned) { |
1090 | warned = 1; |
1091 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm); |
1092 | } |
1093 | family = PF_PACKET; |
1094 | } |
1095 | |
1096 | err = security_socket_create(family, type, protocol, kern); |
1097 | if (err) |
1098 | return err; |
1099 | |
1100 | #if defined(CONFIG_KMOD) |
1101 | /* Attempt to load a protocol module if the find failed. |
1102 | * |
1103 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user |
1104 | * requested real, full-featured networking support upon configuration. |
1105 | * Otherwise module support will break! |
1106 | */ |
1107 | if (net_families[family]==NULL) |
1108 | { |
1109 | request_module("net-pf-%d",family); |
1110 | } |
1111 | #endif |
1112 | |
1113 | net_family_read_lock(); |
1114 | if (net_families[family] == NULL) { |
1115 | err = -EAFNOSUPPORT; |
1116 | goto out; |
1117 | } |
1118 | |
1119 | /* |
1120 | * Allocate the socket and allow the family to set things up. if |
1121 | * the protocol is 0, the family is instructed to select an appropriate |
1122 | * default. |
1123 | */ |
1124 | |
1125 | if (!(sock = sock_alloc())) { |
1126 | printk(KERN_WARNING "socket: no more sockets\n"); |
1127 | err = -ENFILE; /* Not exactly a match, but its the |
1128 | closest posix thing */ |
1129 | goto out; |
1130 | } |
1131 | |
1132 | sock->type = type; |
1133 | |
1134 | /* |
1135 | * We will call the ->create function, that possibly is in a loadable |
1136 | * module, so we have to bump that loadable module refcnt first. |
1137 | */ |
1138 | err = -EAFNOSUPPORT; |
1139 | if (!try_module_get(net_families[family]->owner)) |
1140 | goto out_release; |
1141 | |
1142 | if ((err = net_families[family]->create(sock, protocol)) < 0) |
1143 | goto out_module_put; |
1144 | /* |
1145 | * Now to bump the refcnt of the [loadable] module that owns this |
1146 | * socket at sock_release time we decrement its refcnt. |
1147 | */ |
1148 | if (!try_module_get(sock->ops->owner)) { |
1149 | sock->ops = NULL; |
1150 | goto out_module_put; |
1151 | } |
1152 | /* |
1153 | * Now that we're done with the ->create function, the [loadable] |
1154 | * module can have its refcnt decremented |
1155 | */ |
1156 | module_put(net_families[family]->owner); |
1157 | *res = sock; |
1158 | security_socket_post_create(sock, family, type, protocol, kern); |
1159 | |
1160 | out: |
1161 | net_family_read_unlock(); |
1162 | return err; |
1163 | out_module_put: |
1164 | module_put(net_families[family]->owner); |
1165 | out_release: |
1166 | sock_release(sock); |
1167 | goto out; |
1168 | } |
1169 | |
1170 | int sock_create(int family, int type, int protocol, struct socket **res) |
1171 | { |
1172 | return __sock_create(family, type, protocol, res, 0); |
1173 | } |
1174 | |
1175 | int sock_create_kern(int family, int type, int protocol, struct socket **res) |
1176 | { |
1177 | return __sock_create(family, type, protocol, res, 1); |
1178 | } |
1179 | |
1180 | asmlinkage long sys_socket(int family, int type, int protocol) |
1181 | { |
1182 | int retval; |
1183 | struct socket *sock; |
1184 | |
1185 | retval = sock_create(family, type, protocol, &sock); |
1186 | if (retval < 0) |
1187 | goto out; |
1188 | |
1189 | retval = sock_map_fd(sock); |
1190 | if (retval < 0) |
1191 | goto out_release; |
1192 | |
1193 | out: |
1194 | /* It may be already another descriptor 8) Not kernel problem. */ |
1195 | return retval; |
1196 | |
1197 | out_release: |
1198 | sock_release(sock); |
1199 | return retval; |
1200 | } |
1201 | |
1202 | /* |
1203 | * Create a pair of connected sockets. |
1204 | */ |
1205 | |
1206 | asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec) |
1207 | { |
1208 | struct socket *sock1, *sock2; |
1209 | int fd1, fd2, err; |
1210 | |
1211 | /* |
1212 | * Obtain the first socket and check if the underlying protocol |
1213 | * supports the socketpair call. |
1214 | */ |
1215 | |
1216 | err = sock_create(family, type, protocol, &sock1); |
1217 | if (err < 0) |
1218 | goto out; |
1219 | |
1220 | err = sock_create(family, type, protocol, &sock2); |
1221 | if (err < 0) |
1222 | goto out_release_1; |
1223 | |
1224 | err = sock1->ops->socketpair(sock1, sock2); |
1225 | if (err < 0) |
1226 | goto out_release_both; |
1227 | |
1228 | fd1 = fd2 = -1; |
1229 | |
1230 | err = sock_map_fd(sock1); |
1231 | if (err < 0) |
1232 | goto out_release_both; |
1233 | fd1 = err; |
1234 | |
1235 | err = sock_map_fd(sock2); |
1236 | if (err < 0) |
1237 | goto out_close_1; |
1238 | fd2 = err; |
1239 | |
1240 | /* fd1 and fd2 may be already another descriptors. |
1241 | * Not kernel problem. |
1242 | */ |
1243 | |
1244 | err = put_user(fd1, &usockvec[0]); |
1245 | if (!err) |
1246 | err = put_user(fd2, &usockvec[1]); |
1247 | if (!err) |
1248 | return 0; |
1249 | |
1250 | sys_close(fd2); |
1251 | sys_close(fd1); |
1252 | return err; |
1253 | |
1254 | out_close_1: |
1255 | sock_release(sock2); |
1256 | sys_close(fd1); |
1257 | return err; |
1258 | |
1259 | out_release_both: |
1260 | sock_release(sock2); |
1261 | out_release_1: |
1262 | sock_release(sock1); |
1263 | out: |
1264 | return err; |
1265 | } |
1266 | |
1267 | |
1268 | /* |
1269 | * Bind a name to a socket. Nothing much to do here since it's |
1270 | * the protocol's responsibility to handle the local address. |
1271 | * |
1272 | * We move the socket address to kernel space before we call |
1273 | * the protocol layer (having also checked the address is ok). |
1274 | */ |
1275 | |
1276 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
1277 | { |
1278 | struct socket *sock; |
1279 | char address[MAX_SOCK_ADDR]; |
1280 | int err; |
1281 | |
1282 | if((sock = sockfd_lookup(fd,&err))!=NULL) |
1283 | { |
1284 | if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) { |
1285 | err = security_socket_bind(sock, (struct sockaddr *)address, addrlen); |
1286 | if (err) { |
1287 | sockfd_put(sock); |
1288 | return err; |
1289 | } |
1290 | err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen); |
1291 | } |
1292 | sockfd_put(sock); |
1293 | } |
1294 | return err; |
1295 | } |
1296 | |
1297 | |
1298 | /* |
1299 | * Perform a listen. Basically, we allow the protocol to do anything |
1300 | * necessary for a listen, and if that works, we mark the socket as |
1301 | * ready for listening. |
1302 | */ |
1303 | |
1304 | int sysctl_somaxconn = SOMAXCONN; |
1305 | |
1306 | asmlinkage long sys_listen(int fd, int backlog) |
1307 | { |
1308 | struct socket *sock; |
1309 | int err; |
1310 | |
1311 | if ((sock = sockfd_lookup(fd, &err)) != NULL) { |
1312 | if ((unsigned) backlog > sysctl_somaxconn) |
1313 | backlog = sysctl_somaxconn; |
1314 | |
1315 | err = security_socket_listen(sock, backlog); |
1316 | if (err) { |
1317 | sockfd_put(sock); |
1318 | return err; |
1319 | } |
1320 | |
1321 | err=sock->ops->listen(sock, backlog); |
1322 | sockfd_put(sock); |
1323 | } |
1324 | return err; |
1325 | } |
1326 | |
1327 | |
1328 | /* |
1329 | * For accept, we attempt to create a new socket, set up the link |
1330 | * with the client, wake up the client, then return the new |
1331 | * connected fd. We collect the address of the connector in kernel |
1332 | * space and move it to user at the very end. This is unclean because |
1333 | * we open the socket then return an error. |
1334 | * |
1335 | * 1003.1g adds the ability to recvmsg() to query connection pending |
1336 | * status to recvmsg. We need to add that support in a way thats |
1337 | * clean when we restucture accept also. |
1338 | */ |
1339 | |
1340 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen) |
1341 | { |
1342 | struct socket *sock, *newsock; |
1343 | int err, len; |
1344 | char address[MAX_SOCK_ADDR]; |
1345 | |
1346 | sock = sockfd_lookup(fd, &err); |
1347 | if (!sock) |
1348 | goto out; |
1349 | |
1350 | err = -ENFILE; |
1351 | if (!(newsock = sock_alloc())) |
1352 | goto out_put; |
1353 | |
1354 | newsock->type = sock->type; |
1355 | newsock->ops = sock->ops; |
1356 | |
1357 | err = security_socket_accept(sock, newsock); |
1358 | if (err) |
1359 | goto out_release; |
1360 | |
1361 | /* |
1362 | * We don't need try_module_get here, as the listening socket (sock) |
1363 | * has the protocol module (sock->ops->owner) held. |
1364 | */ |
1365 | __module_get(newsock->ops->owner); |
1366 | |
1367 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1368 | if (err < 0) |
1369 | goto out_release; |
1370 | |
1371 | if (upeer_sockaddr) { |
1372 | if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) { |
1373 | err = -ECONNABORTED; |
1374 | goto out_release; |
1375 | } |
1376 | err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen); |
1377 | if (err < 0) |
1378 | goto out_release; |
1379 | } |
1380 | |
1381 | /* File flags are not inherited via accept() unlike another OSes. */ |
1382 | |
1383 | if ((err = sock_map_fd(newsock)) < 0) |
1384 | goto out_release; |
1385 | |
1386 | security_socket_post_accept(sock, newsock); |
1387 | |
1388 | out_put: |
1389 | sockfd_put(sock); |
1390 | out: |
1391 | return err; |
1392 | out_release: |
1393 | sock_release(newsock); |
1394 | goto out_put; |
1395 | } |
1396 | |
1397 | |
1398 | /* |
1399 | * Attempt to connect to a socket with the server address. The address |
1400 | * is in user space so we verify it is OK and move it to kernel space. |
1401 | * |
1402 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to |
1403 | * break bindings |
1404 | * |
1405 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and |
1406 | * other SEQPACKET protocols that take time to connect() as it doesn't |
1407 | * include the -EINPROGRESS status for such sockets. |
1408 | */ |
1409 | |
1410 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) |
1411 | { |
1412 | struct socket *sock; |
1413 | char address[MAX_SOCK_ADDR]; |
1414 | int err; |
1415 | |
1416 | sock = sockfd_lookup(fd, &err); |
1417 | if (!sock) |
1418 | goto out; |
1419 | err = move_addr_to_kernel(uservaddr, addrlen, address); |
1420 | if (err < 0) |
1421 | goto out_put; |
1422 | |
1423 | err = security_socket_connect(sock, (struct sockaddr *)address, addrlen); |
1424 | if (err) |
1425 | goto out_put; |
1426 | |
1427 | err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen, |
1428 | sock->file->f_flags); |
1429 | out_put: |
1430 | sockfd_put(sock); |
1431 | out: |
1432 | return err; |
1433 | } |
1434 | |
1435 | /* |
1436 | * Get the local address ('name') of a socket object. Move the obtained |
1437 | * name to user space. |
1438 | */ |
1439 | |
1440 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) |
1441 | { |
1442 | struct socket *sock; |
1443 | char address[MAX_SOCK_ADDR]; |
1444 | int len, err; |
1445 | |
1446 | sock = sockfd_lookup(fd, &err); |
1447 | if (!sock) |
1448 | goto out; |
1449 | |
1450 | err = security_socket_getsockname(sock); |
1451 | if (err) |
1452 | goto out_put; |
1453 | |
1454 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); |
1455 | if (err) |
1456 | goto out_put; |
1457 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); |
1458 | |
1459 | out_put: |
1460 | sockfd_put(sock); |
1461 | out: |
1462 | return err; |
1463 | } |
1464 | |
1465 | /* |
1466 | * Get the remote address ('name') of a socket object. Move the obtained |
1467 | * name to user space. |
1468 | */ |
1469 | |
1470 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) |
1471 | { |
1472 | struct socket *sock; |
1473 | char address[MAX_SOCK_ADDR]; |
1474 | int len, err; |
1475 | |
1476 | if ((sock = sockfd_lookup(fd, &err))!=NULL) |
1477 | { |
1478 | err = security_socket_getpeername(sock); |
1479 | if (err) { |
1480 | sockfd_put(sock); |
1481 | return err; |
1482 | } |
1483 | |
1484 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1); |
1485 | if (!err) |
1486 | err=move_addr_to_user(address,len, usockaddr, usockaddr_len); |
1487 | sockfd_put(sock); |
1488 | } |
1489 | return err; |
1490 | } |
1491 | |
1492 | /* |
1493 | * Send a datagram to a given address. We move the address into kernel |
1494 | * space and check the user space data area is readable before invoking |
1495 | * the protocol. |
1496 | */ |
1497 | |
1498 | asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags, |
1499 | struct sockaddr __user *addr, int addr_len) |
1500 | { |
1501 | struct socket *sock; |
1502 | char address[MAX_SOCK_ADDR]; |
1503 | int err; |
1504 | struct msghdr msg; |
1505 | struct iovec iov; |
1506 | |
1507 | sock = sockfd_lookup(fd, &err); |
1508 | if (!sock) |
1509 | goto out; |
1510 | iov.iov_base=buff; |
1511 | iov.iov_len=len; |
1512 | msg.msg_name=NULL; |
1513 | msg.msg_iov=&iov; |
1514 | msg.msg_iovlen=1; |
1515 | msg.msg_control=NULL; |
1516 | msg.msg_controllen=0; |
1517 | msg.msg_namelen=0; |
1518 | if(addr) |
1519 | { |
1520 | err = move_addr_to_kernel(addr, addr_len, address); |
1521 | if (err < 0) |
1522 | goto out_put; |
1523 | msg.msg_name=address; |
1524 | msg.msg_namelen=addr_len; |
1525 | } |
1526 | if (sock->file->f_flags & O_NONBLOCK) |
1527 | flags |= MSG_DONTWAIT; |
1528 | msg.msg_flags = flags; |
1529 | err = sock_sendmsg(sock, &msg, len); |
1530 | |
1531 | out_put: |
1532 | sockfd_put(sock); |
1533 | out: |
1534 | return err; |
1535 | } |
1536 | |
1537 | /* |
1538 | * Send a datagram down a socket. |
1539 | */ |
1540 | |
1541 | asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags) |
1542 | { |
1543 | return sys_sendto(fd, buff, len, flags, NULL, 0); |
1544 | } |
1545 | |
1546 | /* |
1547 | * Receive a frame from the socket and optionally record the address of the |
1548 | * sender. We verify the buffers are writable and if needed move the |
1549 | * sender address from kernel to user space. |
1550 | */ |
1551 | |
1552 | asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags, |
1553 | struct sockaddr __user *addr, int __user *addr_len) |
1554 | { |
1555 | struct socket *sock; |
1556 | struct iovec iov; |
1557 | struct msghdr msg; |
1558 | char address[MAX_SOCK_ADDR]; |
1559 | int err,err2; |
1560 | |
1561 | sock = sockfd_lookup(fd, &err); |
1562 | if (!sock) |
1563 | goto out; |
1564 | |
1565 | msg.msg_control=NULL; |
1566 | msg.msg_controllen=0; |
1567 | msg.msg_iovlen=1; |
1568 | msg.msg_iov=&iov; |
1569 | iov.iov_len=size; |
1570 | iov.iov_base=ubuf; |
1571 | msg.msg_name=address; |
1572 | msg.msg_namelen=MAX_SOCK_ADDR; |
1573 | if (sock->file->f_flags & O_NONBLOCK) |
1574 | flags |= MSG_DONTWAIT; |
1575 | err=sock_recvmsg(sock, &msg, size, flags); |
1576 | |
1577 | if(err >= 0 && addr != NULL) |
1578 | { |
1579 | err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len); |
1580 | if(err2<0) |
1581 | err=err2; |
1582 | } |
1583 | sockfd_put(sock); |
1584 | out: |
1585 | return err; |
1586 | } |
1587 | |
1588 | /* |
1589 | * Receive a datagram from a socket. |
1590 | */ |
1591 | |
1592 | asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags) |
1593 | { |
1594 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1595 | } |
1596 | |
1597 | /* |
1598 | * Set a socket option. Because we don't know the option lengths we have |
1599 | * to pass the user mode parameter for the protocols to sort out. |
1600 | */ |
1601 | |
1602 | asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen) |
1603 | { |
1604 | int err; |
1605 | struct socket *sock; |
1606 | |
1607 | if (optlen < 0) |
1608 | return -EINVAL; |
1609 | |
1610 | if ((sock = sockfd_lookup(fd, &err))!=NULL) |
1611 | { |
1612 | err = security_socket_setsockopt(sock,level,optname); |
1613 | if (err) { |
1614 | sockfd_put(sock); |
1615 | return err; |
1616 | } |
1617 | |
1618 | if (level == SOL_SOCKET) |
1619 | err=sock_setsockopt(sock,level,optname,optval,optlen); |
1620 | else |
1621 | err=sock->ops->setsockopt(sock, level, optname, optval, optlen); |
1622 | sockfd_put(sock); |
1623 | } |
1624 | return err; |
1625 | } |
1626 | |
1627 | /* |
1628 | * Get a socket option. Because we don't know the option lengths we have |
1629 | * to pass a user mode parameter for the protocols to sort out. |
1630 | */ |
1631 | |
1632 | asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen) |
1633 | { |
1634 | int err; |
1635 | struct socket *sock; |
1636 | |
1637 | if ((sock = sockfd_lookup(fd, &err))!=NULL) |
1638 | { |
1639 | err = security_socket_getsockopt(sock, level, |
1640 | optname); |
1641 | if (err) { |
1642 | sockfd_put(sock); |
1643 | return err; |
1644 | } |
1645 | |
1646 | if (level == SOL_SOCKET) |
1647 | err=sock_getsockopt(sock,level,optname,optval,optlen); |
1648 | else |
1649 | err=sock->ops->getsockopt(sock, level, optname, optval, optlen); |
1650 | sockfd_put(sock); |
1651 | } |
1652 | return err; |
1653 | } |
1654 | |
1655 | |
1656 | /* |
1657 | * Shutdown a socket. |
1658 | */ |
1659 | |
1660 | asmlinkage long sys_shutdown(int fd, int how) |
1661 | { |
1662 | int err; |
1663 | struct socket *sock; |
1664 | |
1665 | if ((sock = sockfd_lookup(fd, &err))!=NULL) |
1666 | { |
1667 | err = security_socket_shutdown(sock, how); |
1668 | if (err) { |
1669 | sockfd_put(sock); |
1670 | return err; |
1671 | } |
1672 | |
1673 | err=sock->ops->shutdown(sock, how); |
1674 | sockfd_put(sock); |
1675 | } |
1676 | return err; |
1677 | } |
1678 | |
1679 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1680 | * fields which are the same type (int / unsigned) on our platforms. |
1681 | */ |
1682 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) |
1683 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) |
1684 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) |
1685 | |
1686 | |
1687 | /* |
1688 | * BSD sendmsg interface |
1689 | */ |
1690 | |
1691 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) |
1692 | { |
1693 | struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; |
1694 | struct socket *sock; |
1695 | char address[MAX_SOCK_ADDR]; |
1696 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
1697 | unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */ |
1698 | unsigned char *ctl_buf = ctl; |
1699 | struct msghdr msg_sys; |
1700 | int err, ctl_len, iov_size, total_len; |
1701 | |
1702 | err = -EFAULT; |
1703 | if (MSG_CMSG_COMPAT & flags) { |
1704 | if (get_compat_msghdr(&msg_sys, msg_compat)) |
1705 | return -EFAULT; |
1706 | } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) |
1707 | return -EFAULT; |
1708 | |
1709 | sock = sockfd_lookup(fd, &err); |
1710 | if (!sock) |
1711 | goto out; |
1712 | |
1713 | /* do not move before msg_sys is valid */ |
1714 | err = -EMSGSIZE; |
1715 | if (msg_sys.msg_iovlen > UIO_MAXIOV) |
1716 | goto out_put; |
1717 | |
1718 | /* Check whether to allocate the iovec area*/ |
1719 | err = -ENOMEM; |
1720 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); |
1721 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { |
1722 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
1723 | if (!iov) |
1724 | goto out_put; |
1725 | } |
1726 | |
1727 | /* This will also move the address data into kernel space */ |
1728 | if (MSG_CMSG_COMPAT & flags) { |
1729 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); |
1730 | } else |
1731 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); |
1732 | if (err < 0) |
1733 | goto out_freeiov; |
1734 | total_len = err; |
1735 | |
1736 | err = -ENOBUFS; |
1737 | |
1738 | if (msg_sys.msg_controllen > INT_MAX) |
1739 | goto out_freeiov; |
1740 | ctl_len = msg_sys.msg_controllen; |
1741 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
1742 | err = cmsghdr_from_user_compat_to_kern(&msg_sys, ctl, sizeof(ctl)); |
1743 | if (err) |
1744 | goto out_freeiov; |
1745 | ctl_buf = msg_sys.msg_control; |
1746 | } else if (ctl_len) { |
1747 | if (ctl_len > sizeof(ctl)) |
1748 | { |
1749 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
1750 | if (ctl_buf == NULL) |
1751 | goto out_freeiov; |
1752 | } |
1753 | err = -EFAULT; |
1754 | /* |
1755 | * Careful! Before this, msg_sys.msg_control contains a user pointer. |
1756 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted |
1757 | * checking falls down on this. |
1758 | */ |
1759 | if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len)) |
1760 | goto out_freectl; |
1761 | msg_sys.msg_control = ctl_buf; |
1762 | } |
1763 | msg_sys.msg_flags = flags; |
1764 | |
1765 | if (sock->file->f_flags & O_NONBLOCK) |
1766 | msg_sys.msg_flags |= MSG_DONTWAIT; |
1767 | err = sock_sendmsg(sock, &msg_sys, total_len); |
1768 | |
1769 | out_freectl: |
1770 | if (ctl_buf != ctl) |
1771 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
1772 | out_freeiov: |
1773 | if (iov != iovstack) |
1774 | sock_kfree_s(sock->sk, iov, iov_size); |
1775 | out_put: |
1776 | sockfd_put(sock); |
1777 | out: |
1778 | return err; |
1779 | } |
1780 | |
1781 | /* |
1782 | * BSD recvmsg interface |
1783 | */ |
1784 | |
1785 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags) |
1786 | { |
1787 | struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; |
1788 | struct socket *sock; |
1789 | struct iovec iovstack[UIO_FASTIOV]; |
1790 | struct iovec *iov=iovstack; |
1791 | struct msghdr msg_sys; |
1792 | unsigned long cmsg_ptr; |
1793 | int err, iov_size, total_len, len; |
1794 | |
1795 | /* kernel mode address */ |
1796 | char addr[MAX_SOCK_ADDR]; |
1797 | |
1798 | /* user mode address pointers */ |
1799 | struct sockaddr __user *uaddr; |
1800 | int __user *uaddr_len; |
1801 | |
1802 | if (MSG_CMSG_COMPAT & flags) { |
1803 | if (get_compat_msghdr(&msg_sys, msg_compat)) |
1804 | return -EFAULT; |
1805 | } else |
1806 | if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) |
1807 | return -EFAULT; |
1808 | |
1809 | sock = sockfd_lookup(fd, &err); |
1810 | if (!sock) |
1811 | goto out; |
1812 | |
1813 | err = -EMSGSIZE; |
1814 | if (msg_sys.msg_iovlen > UIO_MAXIOV) |
1815 | goto out_put; |
1816 | |
1817 | /* Check whether to allocate the iovec area*/ |
1818 | err = -ENOMEM; |
1819 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); |
1820 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { |
1821 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
1822 | if (!iov) |
1823 | goto out_put; |
1824 | } |
1825 | |
1826 | /* |
1827 | * Save the user-mode address (verify_iovec will change the |
1828 | * kernel msghdr to use the kernel address space) |
1829 | */ |
1830 | |
1831 | uaddr = (void __user *) msg_sys.msg_name; |
1832 | uaddr_len = COMPAT_NAMELEN(msg); |
1833 | if (MSG_CMSG_COMPAT & flags) { |
1834 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); |
1835 | } else |
1836 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); |
1837 | if (err < 0) |
1838 | goto out_freeiov; |
1839 | total_len=err; |
1840 | |
1841 | cmsg_ptr = (unsigned long)msg_sys.msg_control; |
1842 | msg_sys.msg_flags = 0; |
1843 | if (MSG_CMSG_COMPAT & flags) |
1844 | msg_sys.msg_flags = MSG_CMSG_COMPAT; |
1845 | |
1846 | if (sock->file->f_flags & O_NONBLOCK) |
1847 | flags |= MSG_DONTWAIT; |
1848 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); |
1849 | if (err < 0) |
1850 | goto out_freeiov; |
1851 | len = err; |
1852 | |
1853 | if (uaddr != NULL) { |
1854 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len); |
1855 | if (err < 0) |
1856 | goto out_freeiov; |
1857 | } |
1858 | err = __put_user(msg_sys.msg_flags, COMPAT_FLAGS(msg)); |
1859 | if (err) |
1860 | goto out_freeiov; |
1861 | if (MSG_CMSG_COMPAT & flags) |
1862 | err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, |
1863 | &msg_compat->msg_controllen); |
1864 | else |
1865 | err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, |
1866 | &msg->msg_controllen); |
1867 | if (err) |
1868 | goto out_freeiov; |
1869 | err = len; |
1870 | |
1871 | out_freeiov: |
1872 | if (iov != iovstack) |
1873 | sock_kfree_s(sock->sk, iov, iov_size); |
1874 | out_put: |
1875 | sockfd_put(sock); |
1876 | out: |
1877 | return err; |
1878 | } |
1879 | |
1880 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
1881 | |
1882 | /* Argument list sizes for sys_socketcall */ |
1883 | #define AL(x) ((x) * sizeof(unsigned long)) |
1884 | static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), |
1885 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), |
1886 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; |
1887 | #undef AL |
1888 | |
1889 | /* |
1890 | * System call vectors. |
1891 | * |
1892 | * Argument checking cleaned up. Saved 20% in size. |
1893 | * This function doesn't need to set the kernel lock because |
1894 | * it is set by the callees. |
1895 | */ |
1896 | |
1897 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) |
1898 | { |
1899 | unsigned long a[6]; |
1900 | unsigned long a0,a1; |
1901 | int err; |
1902 | |
1903 | if(call<1||call>SYS_RECVMSG) |
1904 | return -EINVAL; |
1905 | |
1906 | /* copy_from_user should be SMP safe. */ |
1907 | if (copy_from_user(a, args, nargs[call])) |
1908 | return -EFAULT; |
1909 | |
1910 | a0=a[0]; |
1911 | a1=a[1]; |
1912 | |
1913 | switch(call) |
1914 | { |
1915 | case SYS_SOCKET: |
1916 | err = sys_socket(a0,a1,a[2]); |
1917 | break; |
1918 | case SYS_BIND: |
1919 | err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]); |
1920 | break; |
1921 | case SYS_CONNECT: |
1922 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
1923 | break; |
1924 | case SYS_LISTEN: |
1925 | err = sys_listen(a0,a1); |
1926 | break; |
1927 | case SYS_ACCEPT: |
1928 | err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); |
1929 | break; |
1930 | case SYS_GETSOCKNAME: |
1931 | err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); |
1932 | break; |
1933 | case SYS_GETPEERNAME: |
1934 | err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); |
1935 | break; |
1936 | case SYS_SOCKETPAIR: |
1937 | err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]); |
1938 | break; |
1939 | case SYS_SEND: |
1940 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); |
1941 | break; |
1942 | case SYS_SENDTO: |
1943 | err = sys_sendto(a0,(void __user *)a1, a[2], a[3], |
1944 | (struct sockaddr __user *)a[4], a[5]); |
1945 | break; |
1946 | case SYS_RECV: |
1947 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); |
1948 | break; |
1949 | case SYS_RECVFROM: |
1950 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
1951 | (struct sockaddr __user *)a[4], (int __user *)a[5]); |
1952 | break; |
1953 | case SYS_SHUTDOWN: |
1954 | err = sys_shutdown(a0,a1); |
1955 | break; |
1956 | case SYS_SETSOCKOPT: |
1957 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); |
1958 | break; |
1959 | case SYS_GETSOCKOPT: |
1960 | err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]); |
1961 | break; |
1962 | case SYS_SENDMSG: |
1963 | err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]); |
1964 | break; |
1965 | case SYS_RECVMSG: |
1966 | err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]); |
1967 | break; |
1968 | default: |
1969 | err = -EINVAL; |
1970 | break; |
1971 | } |
1972 | return err; |
1973 | } |
1974 | |
1975 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1976 | |
1977 | /* |
1978 | * This function is called by a protocol handler that wants to |
1979 | * advertise its address family, and have it linked into the |
1980 | * SOCKET module. |
1981 | */ |
1982 | |
1983 | int sock_register(struct net_proto_family *ops) |
1984 | { |
1985 | int err; |
1986 | |
1987 | if (ops->family >= NPROTO) { |
1988 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
1989 | return -ENOBUFS; |
1990 | } |
1991 | net_family_write_lock(); |
1992 | err = -EEXIST; |
1993 | if (net_families[ops->family] == NULL) { |
1994 | net_families[ops->family]=ops; |
1995 | err = 0; |
1996 | } |
1997 | net_family_write_unlock(); |
1998 | printk(KERN_INFO "NET: Registered protocol family %d\n", |
1999 | ops->family); |
2000 | return err; |
2001 | } |
2002 | |
2003 | /* |
2004 | * This function is called by a protocol handler that wants to |
2005 | * remove its address family, and have it unlinked from the |
2006 | * SOCKET module. |
2007 | */ |
2008 | |
2009 | int sock_unregister(int family) |
2010 | { |
2011 | if (family < 0 || family >= NPROTO) |
2012 | return -1; |
2013 | |
2014 | net_family_write_lock(); |
2015 | net_families[family]=NULL; |
2016 | net_family_write_unlock(); |
2017 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", |
2018 | family); |
2019 | return 0; |
2020 | } |
2021 | |
2022 | |
2023 | extern void sk_init(void); |
2024 | |
2025 | void __init sock_init(void) |
2026 | { |
2027 | /* |
2028 | * Initialize sock SLAB cache. |
2029 | */ |
2030 | |
2031 | sk_init(); |
2032 | |
2033 | #ifdef SLAB_SKB |
2034 | /* |
2035 | * Initialize skbuff SLAB cache |
2036 | */ |
2037 | skb_init(); |
2038 | #endif |
2039 | |
2040 | /* |
2041 | * Initialize the protocols module. |
2042 | */ |
2043 | |
2044 | init_inodecache(); |
2045 | register_filesystem(&sock_fs_type); |
2046 | sock_mnt = kern_mount(&sock_fs_type); |
2047 | /* The real protocol initialization is performed when |
2048 | * do_initcalls is run. |
2049 | */ |
2050 | |
2051 | #ifdef CONFIG_NETFILTER |
2052 | netfilter_init(); |
2053 | #endif |
2054 | } |
2055 | |
2056 | #ifdef CONFIG_PROC_FS |
2057 | void socket_seq_show(struct seq_file *seq) |
2058 | { |
2059 | int cpu; |
2060 | int counter = 0; |
2061 | |
2062 | for (cpu = 0; cpu < NR_CPUS; cpu++) |
2063 | counter += per_cpu(sockets_in_use, cpu); |
2064 | |
2065 | /* It can be negative, by the way. 8) */ |
2066 | if (counter < 0) |
2067 | counter = 0; |
2068 | |
2069 | seq_printf(seq, "sockets: used %d\n", counter); |
2070 | } |
2071 | #endif /* CONFIG_PROC_FS */ |
2072 | |
2073 | /* ABI emulation layers need these two */ |
2074 | EXPORT_SYMBOL(move_addr_to_kernel); |
2075 | EXPORT_SYMBOL(move_addr_to_user); |
2076 | EXPORT_SYMBOL(sock_create); |
2077 | EXPORT_SYMBOL(sock_create_kern); |
2078 | EXPORT_SYMBOL(sock_create_lite); |
2079 | EXPORT_SYMBOL(sock_map_fd); |
2080 | EXPORT_SYMBOL(sock_recvmsg); |
2081 | EXPORT_SYMBOL(sock_register); |
2082 | EXPORT_SYMBOL(sock_release); |
2083 | EXPORT_SYMBOL(sock_sendmsg); |
2084 | EXPORT_SYMBOL(sock_unregister); |
2085 | EXPORT_SYMBOL(sock_wake_async); |
2086 | EXPORT_SYMBOL(sockfd_lookup); |
2087 | EXPORT_SYMBOL(kernel_sendmsg); |
2088 | EXPORT_SYMBOL(kernel_recvmsg); |