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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/mm.h> |
62 | #include <linux/socket.h> |
63 | #include <linux/file.h> |
64 | #include <linux/net.h> |
65 | #include <linux/interrupt.h> |
66 | #include <linux/thread_info.h> |
67 | #include <linux/rcupdate.h> |
68 | #include <linux/netdevice.h> |
69 | #include <linux/proc_fs.h> |
70 | #include <linux/seq_file.h> |
71 | #include <linux/mutex.h> |
72 | #include <linux/if_bridge.h> |
73 | #include <linux/if_frad.h> |
74 | #include <linux/if_vlan.h> |
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/mount.h> |
81 | #include <linux/security.h> |
82 | #include <linux/syscalls.h> |
83 | #include <linux/compat.h> |
84 | #include <linux/kmod.h> |
85 | #include <linux/audit.h> |
86 | #include <linux/wireless.h> |
87 | #include <linux/nsproxy.h> |
88 | #include <linux/magic.h> |
89 | #include <linux/slab.h> |
90 | #include <linux/xattr.h> |
91 | |
92 | #include <asm/uaccess.h> |
93 | #include <asm/unistd.h> |
94 | |
95 | #include <net/compat.h> |
96 | #include <net/wext.h> |
97 | #include <net/cls_cgroup.h> |
98 | |
99 | #include <net/sock.h> |
100 | #include <linux/netfilter.h> |
101 | |
102 | #include <linux/if_tun.h> |
103 | #include <linux/ipv6_route.h> |
104 | #include <linux/route.h> |
105 | #include <linux/sockios.h> |
106 | #include <linux/atalk.h> |
107 | #include <net/busy_poll.h> |
108 | |
109 | #ifdef CONFIG_NET_RX_BUSY_POLL |
110 | unsigned int sysctl_net_busy_read __read_mostly; |
111 | unsigned int sysctl_net_busy_poll __read_mostly; |
112 | #endif |
113 | |
114 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); |
115 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
116 | unsigned long nr_segs, loff_t pos); |
117 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
118 | unsigned long nr_segs, loff_t pos); |
119 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
120 | |
121 | static int sock_close(struct inode *inode, struct file *file); |
122 | static unsigned int sock_poll(struct file *file, |
123 | struct poll_table_struct *wait); |
124 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
125 | #ifdef CONFIG_COMPAT |
126 | static long compat_sock_ioctl(struct file *file, |
127 | unsigned int cmd, unsigned long arg); |
128 | #endif |
129 | static int sock_fasync(int fd, struct file *filp, int on); |
130 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
131 | int offset, size_t size, loff_t *ppos, int more); |
132 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
133 | struct pipe_inode_info *pipe, size_t len, |
134 | unsigned int flags); |
135 | |
136 | /* |
137 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear |
138 | * in the operation structures but are done directly via the socketcall() multiplexor. |
139 | */ |
140 | |
141 | static const struct file_operations socket_file_ops = { |
142 | .owner = THIS_MODULE, |
143 | .llseek = no_llseek, |
144 | .aio_read = sock_aio_read, |
145 | .aio_write = sock_aio_write, |
146 | .poll = sock_poll, |
147 | .unlocked_ioctl = sock_ioctl, |
148 | #ifdef CONFIG_COMPAT |
149 | .compat_ioctl = compat_sock_ioctl, |
150 | #endif |
151 | .mmap = sock_mmap, |
152 | .open = sock_no_open, /* special open code to disallow open via /proc */ |
153 | .release = sock_close, |
154 | .fasync = sock_fasync, |
155 | .sendpage = sock_sendpage, |
156 | .splice_write = generic_splice_sendpage, |
157 | .splice_read = sock_splice_read, |
158 | }; |
159 | |
160 | /* |
161 | * The protocol list. Each protocol is registered in here. |
162 | */ |
163 | |
164 | static DEFINE_SPINLOCK(net_family_lock); |
165 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; |
166 | |
167 | /* |
168 | * Statistics counters of the socket lists |
169 | */ |
170 | |
171 | static DEFINE_PER_CPU(int, sockets_in_use); |
172 | |
173 | /* |
174 | * Support routines. |
175 | * Move socket addresses back and forth across the kernel/user |
176 | * divide and look after the messy bits. |
177 | */ |
178 | |
179 | /** |
180 | * move_addr_to_kernel - copy a socket address into kernel space |
181 | * @uaddr: Address in user space |
182 | * @kaddr: Address in kernel space |
183 | * @ulen: Length in user space |
184 | * |
185 | * The address is copied into kernel space. If the provided address is |
186 | * too long an error code of -EINVAL is returned. If the copy gives |
187 | * invalid addresses -EFAULT is returned. On a success 0 is returned. |
188 | */ |
189 | |
190 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) |
191 | { |
192 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
193 | return -EINVAL; |
194 | if (ulen == 0) |
195 | return 0; |
196 | if (copy_from_user(kaddr, uaddr, ulen)) |
197 | return -EFAULT; |
198 | return audit_sockaddr(ulen, kaddr); |
199 | } |
200 | |
201 | /** |
202 | * move_addr_to_user - copy an address to user space |
203 | * @kaddr: kernel space address |
204 | * @klen: length of address in kernel |
205 | * @uaddr: user space address |
206 | * @ulen: pointer to user length field |
207 | * |
208 | * The value pointed to by ulen on entry is the buffer length available. |
209 | * This is overwritten with the buffer space used. -EINVAL is returned |
210 | * if an overlong buffer is specified or a negative buffer size. -EFAULT |
211 | * is returned if either the buffer or the length field are not |
212 | * accessible. |
213 | * After copying the data up to the limit the user specifies, the true |
214 | * length of the data is written over the length limit the user |
215 | * specified. Zero is returned for a success. |
216 | */ |
217 | |
218 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, |
219 | void __user *uaddr, int __user *ulen) |
220 | { |
221 | int err; |
222 | int len; |
223 | |
224 | err = get_user(len, ulen); |
225 | if (err) |
226 | return err; |
227 | if (len > klen) |
228 | len = klen; |
229 | if (len < 0 || len > sizeof(struct sockaddr_storage)) |
230 | return -EINVAL; |
231 | if (len) { |
232 | if (audit_sockaddr(klen, kaddr)) |
233 | return -ENOMEM; |
234 | if (copy_to_user(uaddr, kaddr, len)) |
235 | return -EFAULT; |
236 | } |
237 | /* |
238 | * "fromlen shall refer to the value before truncation.." |
239 | * 1003.1g |
240 | */ |
241 | return __put_user(klen, ulen); |
242 | } |
243 | |
244 | static struct kmem_cache *sock_inode_cachep __read_mostly; |
245 | |
246 | static struct inode *sock_alloc_inode(struct super_block *sb) |
247 | { |
248 | struct socket_alloc *ei; |
249 | struct socket_wq *wq; |
250 | |
251 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
252 | if (!ei) |
253 | return NULL; |
254 | wq = kmalloc(sizeof(*wq), GFP_KERNEL); |
255 | if (!wq) { |
256 | kmem_cache_free(sock_inode_cachep, ei); |
257 | return NULL; |
258 | } |
259 | init_waitqueue_head(&wq->wait); |
260 | wq->fasync_list = NULL; |
261 | RCU_INIT_POINTER(ei->socket.wq, wq); |
262 | |
263 | ei->socket.state = SS_UNCONNECTED; |
264 | ei->socket.flags = 0; |
265 | ei->socket.ops = NULL; |
266 | ei->socket.sk = NULL; |
267 | ei->socket.file = NULL; |
268 | |
269 | return &ei->vfs_inode; |
270 | } |
271 | |
272 | static void sock_destroy_inode(struct inode *inode) |
273 | { |
274 | struct socket_alloc *ei; |
275 | struct socket_wq *wq; |
276 | |
277 | ei = container_of(inode, struct socket_alloc, vfs_inode); |
278 | wq = rcu_dereference_protected(ei->socket.wq, 1); |
279 | kfree_rcu(wq, rcu); |
280 | kmem_cache_free(sock_inode_cachep, ei); |
281 | } |
282 | |
283 | static void init_once(void *foo) |
284 | { |
285 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
286 | |
287 | inode_init_once(&ei->vfs_inode); |
288 | } |
289 | |
290 | static int init_inodecache(void) |
291 | { |
292 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", |
293 | sizeof(struct socket_alloc), |
294 | 0, |
295 | (SLAB_HWCACHE_ALIGN | |
296 | SLAB_RECLAIM_ACCOUNT | |
297 | SLAB_MEM_SPREAD), |
298 | init_once); |
299 | if (sock_inode_cachep == NULL) |
300 | return -ENOMEM; |
301 | return 0; |
302 | } |
303 | |
304 | static const struct super_operations sockfs_ops = { |
305 | .alloc_inode = sock_alloc_inode, |
306 | .destroy_inode = sock_destroy_inode, |
307 | .statfs = simple_statfs, |
308 | }; |
309 | |
310 | /* |
311 | * sockfs_dname() is called from d_path(). |
312 | */ |
313 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) |
314 | { |
315 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", |
316 | dentry->d_inode->i_ino); |
317 | } |
318 | |
319 | static const struct dentry_operations sockfs_dentry_operations = { |
320 | .d_dname = sockfs_dname, |
321 | }; |
322 | |
323 | static struct dentry *sockfs_mount(struct file_system_type *fs_type, |
324 | int flags, const char *dev_name, void *data) |
325 | { |
326 | return mount_pseudo(fs_type, "socket:", &sockfs_ops, |
327 | &sockfs_dentry_operations, SOCKFS_MAGIC); |
328 | } |
329 | |
330 | static struct vfsmount *sock_mnt __read_mostly; |
331 | |
332 | static struct file_system_type sock_fs_type = { |
333 | .name = "sockfs", |
334 | .mount = sockfs_mount, |
335 | .kill_sb = kill_anon_super, |
336 | }; |
337 | |
338 | /* |
339 | * Obtains the first available file descriptor and sets it up for use. |
340 | * |
341 | * These functions create file structures and maps them to fd space |
342 | * of the current process. On success it returns file descriptor |
343 | * and file struct implicitly stored in sock->file. |
344 | * Note that another thread may close file descriptor before we return |
345 | * from this function. We use the fact that now we do not refer |
346 | * to socket after mapping. If one day we will need it, this |
347 | * function will increment ref. count on file by 1. |
348 | * |
349 | * In any case returned fd MAY BE not valid! |
350 | * This race condition is unavoidable |
351 | * with shared fd spaces, we cannot solve it inside kernel, |
352 | * but we take care of internal coherence yet. |
353 | */ |
354 | |
355 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) |
356 | { |
357 | struct qstr name = { .name = "" }; |
358 | struct path path; |
359 | struct file *file; |
360 | |
361 | if (dname) { |
362 | name.name = dname; |
363 | name.len = strlen(name.name); |
364 | } else if (sock->sk) { |
365 | name.name = sock->sk->sk_prot_creator->name; |
366 | name.len = strlen(name.name); |
367 | } |
368 | path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); |
369 | if (unlikely(!path.dentry)) |
370 | return ERR_PTR(-ENOMEM); |
371 | path.mnt = mntget(sock_mnt); |
372 | |
373 | d_instantiate(path.dentry, SOCK_INODE(sock)); |
374 | SOCK_INODE(sock)->i_fop = &socket_file_ops; |
375 | |
376 | file = alloc_file(&path, FMODE_READ | FMODE_WRITE, |
377 | &socket_file_ops); |
378 | if (unlikely(IS_ERR(file))) { |
379 | /* drop dentry, keep inode */ |
380 | ihold(path.dentry->d_inode); |
381 | path_put(&path); |
382 | return file; |
383 | } |
384 | |
385 | sock->file = file; |
386 | file->f_flags = O_RDWR | (flags & O_NONBLOCK); |
387 | file->private_data = sock; |
388 | return file; |
389 | } |
390 | EXPORT_SYMBOL(sock_alloc_file); |
391 | |
392 | static int sock_map_fd(struct socket *sock, int flags) |
393 | { |
394 | struct file *newfile; |
395 | int fd = get_unused_fd_flags(flags); |
396 | if (unlikely(fd < 0)) |
397 | return fd; |
398 | |
399 | newfile = sock_alloc_file(sock, flags, NULL); |
400 | if (likely(!IS_ERR(newfile))) { |
401 | fd_install(fd, newfile); |
402 | return fd; |
403 | } |
404 | |
405 | put_unused_fd(fd); |
406 | return PTR_ERR(newfile); |
407 | } |
408 | |
409 | struct socket *sock_from_file(struct file *file, int *err) |
410 | { |
411 | if (file->f_op == &socket_file_ops) |
412 | return file->private_data; /* set in sock_map_fd */ |
413 | |
414 | *err = -ENOTSOCK; |
415 | return NULL; |
416 | } |
417 | EXPORT_SYMBOL(sock_from_file); |
418 | |
419 | /** |
420 | * sockfd_lookup - Go from a file number to its socket slot |
421 | * @fd: file handle |
422 | * @err: pointer to an error code return |
423 | * |
424 | * The file handle passed in is locked and the socket it is bound |
425 | * too is returned. If an error occurs the err pointer is overwritten |
426 | * with a negative errno code and NULL is returned. The function checks |
427 | * for both invalid handles and passing a handle which is not a socket. |
428 | * |
429 | * On a success the socket object pointer is returned. |
430 | */ |
431 | |
432 | struct socket *sockfd_lookup(int fd, int *err) |
433 | { |
434 | struct file *file; |
435 | struct socket *sock; |
436 | |
437 | file = fget(fd); |
438 | if (!file) { |
439 | *err = -EBADF; |
440 | return NULL; |
441 | } |
442 | |
443 | sock = sock_from_file(file, err); |
444 | if (!sock) |
445 | fput(file); |
446 | return sock; |
447 | } |
448 | EXPORT_SYMBOL(sockfd_lookup); |
449 | |
450 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
451 | { |
452 | struct file *file; |
453 | struct socket *sock; |
454 | |
455 | *err = -EBADF; |
456 | file = fget_light(fd, fput_needed); |
457 | if (file) { |
458 | sock = sock_from_file(file, err); |
459 | if (sock) |
460 | return sock; |
461 | fput_light(file, *fput_needed); |
462 | } |
463 | return NULL; |
464 | } |
465 | |
466 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" |
467 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) |
468 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) |
469 | static ssize_t sockfs_getxattr(struct dentry *dentry, |
470 | const char *name, void *value, size_t size) |
471 | { |
472 | const char *proto_name; |
473 | size_t proto_size; |
474 | int error; |
475 | |
476 | error = -ENODATA; |
477 | if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) { |
478 | proto_name = dentry->d_name.name; |
479 | proto_size = strlen(proto_name); |
480 | |
481 | if (value) { |
482 | error = -ERANGE; |
483 | if (proto_size + 1 > size) |
484 | goto out; |
485 | |
486 | strncpy(value, proto_name, proto_size + 1); |
487 | } |
488 | error = proto_size + 1; |
489 | } |
490 | |
491 | out: |
492 | return error; |
493 | } |
494 | |
495 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, |
496 | size_t size) |
497 | { |
498 | ssize_t len; |
499 | ssize_t used = 0; |
500 | |
501 | len = security_inode_listsecurity(dentry->d_inode, buffer, size); |
502 | if (len < 0) |
503 | return len; |
504 | used += len; |
505 | if (buffer) { |
506 | if (size < used) |
507 | return -ERANGE; |
508 | buffer += len; |
509 | } |
510 | |
511 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); |
512 | used += len; |
513 | if (buffer) { |
514 | if (size < used) |
515 | return -ERANGE; |
516 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); |
517 | buffer += len; |
518 | } |
519 | |
520 | return used; |
521 | } |
522 | |
523 | static const struct inode_operations sockfs_inode_ops = { |
524 | .getxattr = sockfs_getxattr, |
525 | .listxattr = sockfs_listxattr, |
526 | }; |
527 | |
528 | /** |
529 | * sock_alloc - allocate a socket |
530 | * |
531 | * Allocate a new inode and socket object. The two are bound together |
532 | * and initialised. The socket is then returned. If we are out of inodes |
533 | * NULL is returned. |
534 | */ |
535 | |
536 | static struct socket *sock_alloc(void) |
537 | { |
538 | struct inode *inode; |
539 | struct socket *sock; |
540 | |
541 | inode = new_inode_pseudo(sock_mnt->mnt_sb); |
542 | if (!inode) |
543 | return NULL; |
544 | |
545 | sock = SOCKET_I(inode); |
546 | |
547 | kmemcheck_annotate_bitfield(sock, type); |
548 | inode->i_ino = get_next_ino(); |
549 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
550 | inode->i_uid = current_fsuid(); |
551 | inode->i_gid = current_fsgid(); |
552 | inode->i_op = &sockfs_inode_ops; |
553 | |
554 | this_cpu_add(sockets_in_use, 1); |
555 | return sock; |
556 | } |
557 | |
558 | /* |
559 | * In theory you can't get an open on this inode, but /proc provides |
560 | * a back door. Remember to keep it shut otherwise you'll let the |
561 | * creepy crawlies in. |
562 | */ |
563 | |
564 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
565 | { |
566 | return -ENXIO; |
567 | } |
568 | |
569 | const struct file_operations bad_sock_fops = { |
570 | .owner = THIS_MODULE, |
571 | .open = sock_no_open, |
572 | .llseek = noop_llseek, |
573 | }; |
574 | |
575 | /** |
576 | * sock_release - close a socket |
577 | * @sock: socket to close |
578 | * |
579 | * The socket is released from the protocol stack if it has a release |
580 | * callback, and the inode is then released if the socket is bound to |
581 | * an inode not a file. |
582 | */ |
583 | |
584 | void sock_release(struct socket *sock) |
585 | { |
586 | if (sock->ops) { |
587 | struct module *owner = sock->ops->owner; |
588 | |
589 | sock->ops->release(sock); |
590 | sock->ops = NULL; |
591 | module_put(owner); |
592 | } |
593 | |
594 | if (rcu_dereference_protected(sock->wq, 1)->fasync_list) |
595 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); |
596 | |
597 | if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags)) |
598 | return; |
599 | |
600 | this_cpu_sub(sockets_in_use, 1); |
601 | if (!sock->file) { |
602 | iput(SOCK_INODE(sock)); |
603 | return; |
604 | } |
605 | sock->file = NULL; |
606 | } |
607 | EXPORT_SYMBOL(sock_release); |
608 | |
609 | void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags) |
610 | { |
611 | *tx_flags = 0; |
612 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) |
613 | *tx_flags |= SKBTX_HW_TSTAMP; |
614 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) |
615 | *tx_flags |= SKBTX_SW_TSTAMP; |
616 | if (sock_flag(sk, SOCK_WIFI_STATUS)) |
617 | *tx_flags |= SKBTX_WIFI_STATUS; |
618 | } |
619 | EXPORT_SYMBOL(sock_tx_timestamp); |
620 | |
621 | static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock, |
622 | struct msghdr *msg, size_t size) |
623 | { |
624 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
625 | |
626 | si->sock = sock; |
627 | si->scm = NULL; |
628 | si->msg = msg; |
629 | si->size = size; |
630 | |
631 | return sock->ops->sendmsg(iocb, sock, msg, size); |
632 | } |
633 | |
634 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
635 | struct msghdr *msg, size_t size) |
636 | { |
637 | int err = security_socket_sendmsg(sock, msg, size); |
638 | |
639 | return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size); |
640 | } |
641 | |
642 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
643 | { |
644 | struct kiocb iocb; |
645 | struct sock_iocb siocb; |
646 | int ret; |
647 | |
648 | init_sync_kiocb(&iocb, NULL); |
649 | iocb.private = &siocb; |
650 | ret = __sock_sendmsg(&iocb, sock, msg, size); |
651 | if (-EIOCBQUEUED == ret) |
652 | ret = wait_on_sync_kiocb(&iocb); |
653 | return ret; |
654 | } |
655 | EXPORT_SYMBOL(sock_sendmsg); |
656 | |
657 | static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size) |
658 | { |
659 | struct kiocb iocb; |
660 | struct sock_iocb siocb; |
661 | int ret; |
662 | |
663 | init_sync_kiocb(&iocb, NULL); |
664 | iocb.private = &siocb; |
665 | ret = __sock_sendmsg_nosec(&iocb, sock, msg, size); |
666 | if (-EIOCBQUEUED == ret) |
667 | ret = wait_on_sync_kiocb(&iocb); |
668 | return ret; |
669 | } |
670 | |
671 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
672 | struct kvec *vec, size_t num, size_t size) |
673 | { |
674 | mm_segment_t oldfs = get_fs(); |
675 | int result; |
676 | |
677 | set_fs(KERNEL_DS); |
678 | /* |
679 | * the following is safe, since for compiler definitions of kvec and |
680 | * iovec are identical, yielding the same in-core layout and alignment |
681 | */ |
682 | msg->msg_iov = (struct iovec *)vec; |
683 | msg->msg_iovlen = num; |
684 | result = sock_sendmsg(sock, msg, size); |
685 | set_fs(oldfs); |
686 | return result; |
687 | } |
688 | EXPORT_SYMBOL(kernel_sendmsg); |
689 | |
690 | /* |
691 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) |
692 | */ |
693 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
694 | struct sk_buff *skb) |
695 | { |
696 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
697 | struct timespec ts[3]; |
698 | int empty = 1; |
699 | struct skb_shared_hwtstamps *shhwtstamps = |
700 | skb_hwtstamps(skb); |
701 | |
702 | /* Race occurred between timestamp enabling and packet |
703 | receiving. Fill in the current time for now. */ |
704 | if (need_software_tstamp && skb->tstamp.tv64 == 0) |
705 | __net_timestamp(skb); |
706 | |
707 | if (need_software_tstamp) { |
708 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { |
709 | struct timeval tv; |
710 | skb_get_timestamp(skb, &tv); |
711 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, |
712 | sizeof(tv), &tv); |
713 | } else { |
714 | skb_get_timestampns(skb, &ts[0]); |
715 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, |
716 | sizeof(ts[0]), &ts[0]); |
717 | } |
718 | } |
719 | |
720 | |
721 | memset(ts, 0, sizeof(ts)); |
722 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) && |
723 | ktime_to_timespec_cond(skb->tstamp, ts + 0)) |
724 | empty = 0; |
725 | if (shhwtstamps) { |
726 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) && |
727 | ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1)) |
728 | empty = 0; |
729 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) && |
730 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2)) |
731 | empty = 0; |
732 | } |
733 | if (!empty) |
734 | put_cmsg(msg, SOL_SOCKET, |
735 | SCM_TIMESTAMPING, sizeof(ts), &ts); |
736 | } |
737 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
738 | |
739 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
740 | struct sk_buff *skb) |
741 | { |
742 | int ack; |
743 | |
744 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) |
745 | return; |
746 | if (!skb->wifi_acked_valid) |
747 | return; |
748 | |
749 | ack = skb->wifi_acked; |
750 | |
751 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); |
752 | } |
753 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); |
754 | |
755 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
756 | struct sk_buff *skb) |
757 | { |
758 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount) |
759 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
760 | sizeof(__u32), &skb->dropcount); |
761 | } |
762 | |
763 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
764 | struct sk_buff *skb) |
765 | { |
766 | sock_recv_timestamp(msg, sk, skb); |
767 | sock_recv_drops(msg, sk, skb); |
768 | } |
769 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); |
770 | |
771 | static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock, |
772 | struct msghdr *msg, size_t size, int flags) |
773 | { |
774 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
775 | |
776 | si->sock = sock; |
777 | si->scm = NULL; |
778 | si->msg = msg; |
779 | si->size = size; |
780 | si->flags = flags; |
781 | |
782 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); |
783 | } |
784 | |
785 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
786 | struct msghdr *msg, size_t size, int flags) |
787 | { |
788 | int err = security_socket_recvmsg(sock, msg, size, flags); |
789 | |
790 | return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags); |
791 | } |
792 | |
793 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
794 | size_t size, int flags) |
795 | { |
796 | struct kiocb iocb; |
797 | struct sock_iocb siocb; |
798 | int ret; |
799 | |
800 | init_sync_kiocb(&iocb, NULL); |
801 | iocb.private = &siocb; |
802 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); |
803 | if (-EIOCBQUEUED == ret) |
804 | ret = wait_on_sync_kiocb(&iocb); |
805 | return ret; |
806 | } |
807 | EXPORT_SYMBOL(sock_recvmsg); |
808 | |
809 | static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
810 | size_t size, int flags) |
811 | { |
812 | struct kiocb iocb; |
813 | struct sock_iocb siocb; |
814 | int ret; |
815 | |
816 | init_sync_kiocb(&iocb, NULL); |
817 | iocb.private = &siocb; |
818 | ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags); |
819 | if (-EIOCBQUEUED == ret) |
820 | ret = wait_on_sync_kiocb(&iocb); |
821 | return ret; |
822 | } |
823 | |
824 | /** |
825 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
826 | * @sock: The socket to receive the message from |
827 | * @msg: Received message |
828 | * @vec: Input s/g array for message data |
829 | * @num: Size of input s/g array |
830 | * @size: Number of bytes to read |
831 | * @flags: Message flags (MSG_DONTWAIT, etc...) |
832 | * |
833 | * On return the msg structure contains the scatter/gather array passed in the |
834 | * vec argument. The array is modified so that it consists of the unfilled |
835 | * portion of the original array. |
836 | * |
837 | * The returned value is the total number of bytes received, or an error. |
838 | */ |
839 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
840 | struct kvec *vec, size_t num, size_t size, int flags) |
841 | { |
842 | mm_segment_t oldfs = get_fs(); |
843 | int result; |
844 | |
845 | set_fs(KERNEL_DS); |
846 | /* |
847 | * the following is safe, since for compiler definitions of kvec and |
848 | * iovec are identical, yielding the same in-core layout and alignment |
849 | */ |
850 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
851 | result = sock_recvmsg(sock, msg, size, flags); |
852 | set_fs(oldfs); |
853 | return result; |
854 | } |
855 | EXPORT_SYMBOL(kernel_recvmsg); |
856 | |
857 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
858 | int offset, size_t size, loff_t *ppos, int more) |
859 | { |
860 | struct socket *sock; |
861 | int flags; |
862 | |
863 | sock = file->private_data; |
864 | |
865 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
866 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ |
867 | flags |= more; |
868 | |
869 | return kernel_sendpage(sock, page, offset, size, flags); |
870 | } |
871 | |
872 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
873 | struct pipe_inode_info *pipe, size_t len, |
874 | unsigned int flags) |
875 | { |
876 | struct socket *sock = file->private_data; |
877 | |
878 | if (unlikely(!sock->ops->splice_read)) |
879 | return -EINVAL; |
880 | |
881 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
882 | } |
883 | |
884 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
885 | struct sock_iocb *siocb) |
886 | { |
887 | if (!is_sync_kiocb(iocb)) |
888 | BUG(); |
889 | |
890 | siocb->kiocb = iocb; |
891 | iocb->private = siocb; |
892 | return siocb; |
893 | } |
894 | |
895 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
896 | struct file *file, const struct iovec *iov, |
897 | unsigned long nr_segs) |
898 | { |
899 | struct socket *sock = file->private_data; |
900 | size_t size = 0; |
901 | int i; |
902 | |
903 | for (i = 0; i < nr_segs; i++) |
904 | size += iov[i].iov_len; |
905 | |
906 | msg->msg_name = NULL; |
907 | msg->msg_namelen = 0; |
908 | msg->msg_control = NULL; |
909 | msg->msg_controllen = 0; |
910 | msg->msg_iov = (struct iovec *)iov; |
911 | msg->msg_iovlen = nr_segs; |
912 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
913 | |
914 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); |
915 | } |
916 | |
917 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
918 | unsigned long nr_segs, loff_t pos) |
919 | { |
920 | struct sock_iocb siocb, *x; |
921 | |
922 | if (pos != 0) |
923 | return -ESPIPE; |
924 | |
925 | if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */ |
926 | return 0; |
927 | |
928 | |
929 | x = alloc_sock_iocb(iocb, &siocb); |
930 | if (!x) |
931 | return -ENOMEM; |
932 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
933 | } |
934 | |
935 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
936 | struct file *file, const struct iovec *iov, |
937 | unsigned long nr_segs) |
938 | { |
939 | struct socket *sock = file->private_data; |
940 | size_t size = 0; |
941 | int i; |
942 | |
943 | for (i = 0; i < nr_segs; i++) |
944 | size += iov[i].iov_len; |
945 | |
946 | msg->msg_name = NULL; |
947 | msg->msg_namelen = 0; |
948 | msg->msg_control = NULL; |
949 | msg->msg_controllen = 0; |
950 | msg->msg_iov = (struct iovec *)iov; |
951 | msg->msg_iovlen = nr_segs; |
952 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
953 | if (sock->type == SOCK_SEQPACKET) |
954 | msg->msg_flags |= MSG_EOR; |
955 | |
956 | return __sock_sendmsg(iocb, sock, msg, size); |
957 | } |
958 | |
959 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
960 | unsigned long nr_segs, loff_t pos) |
961 | { |
962 | struct sock_iocb siocb, *x; |
963 | |
964 | if (pos != 0) |
965 | return -ESPIPE; |
966 | |
967 | x = alloc_sock_iocb(iocb, &siocb); |
968 | if (!x) |
969 | return -ENOMEM; |
970 | |
971 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
972 | } |
973 | |
974 | /* |
975 | * Atomic setting of ioctl hooks to avoid race |
976 | * with module unload. |
977 | */ |
978 | |
979 | static DEFINE_MUTEX(br_ioctl_mutex); |
980 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); |
981 | |
982 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
983 | { |
984 | mutex_lock(&br_ioctl_mutex); |
985 | br_ioctl_hook = hook; |
986 | mutex_unlock(&br_ioctl_mutex); |
987 | } |
988 | EXPORT_SYMBOL(brioctl_set); |
989 | |
990 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
991 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
992 | |
993 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
994 | { |
995 | mutex_lock(&vlan_ioctl_mutex); |
996 | vlan_ioctl_hook = hook; |
997 | mutex_unlock(&vlan_ioctl_mutex); |
998 | } |
999 | EXPORT_SYMBOL(vlan_ioctl_set); |
1000 | |
1001 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
1002 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1003 | |
1004 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1005 | { |
1006 | mutex_lock(&dlci_ioctl_mutex); |
1007 | dlci_ioctl_hook = hook; |
1008 | mutex_unlock(&dlci_ioctl_mutex); |
1009 | } |
1010 | EXPORT_SYMBOL(dlci_ioctl_set); |
1011 | |
1012 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
1013 | unsigned int cmd, unsigned long arg) |
1014 | { |
1015 | int err; |
1016 | void __user *argp = (void __user *)arg; |
1017 | |
1018 | err = sock->ops->ioctl(sock, cmd, arg); |
1019 | |
1020 | /* |
1021 | * If this ioctl is unknown try to hand it down |
1022 | * to the NIC driver. |
1023 | */ |
1024 | if (err == -ENOIOCTLCMD) |
1025 | err = dev_ioctl(net, cmd, argp); |
1026 | |
1027 | return err; |
1028 | } |
1029 | |
1030 | /* |
1031 | * With an ioctl, arg may well be a user mode pointer, but we don't know |
1032 | * what to do with it - that's up to the protocol still. |
1033 | */ |
1034 | |
1035 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1036 | { |
1037 | struct socket *sock; |
1038 | struct sock *sk; |
1039 | void __user *argp = (void __user *)arg; |
1040 | int pid, err; |
1041 | struct net *net; |
1042 | |
1043 | sock = file->private_data; |
1044 | sk = sock->sk; |
1045 | net = sock_net(sk); |
1046 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
1047 | err = dev_ioctl(net, cmd, argp); |
1048 | } else |
1049 | #ifdef CONFIG_WEXT_CORE |
1050 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
1051 | err = dev_ioctl(net, cmd, argp); |
1052 | } else |
1053 | #endif |
1054 | switch (cmd) { |
1055 | case FIOSETOWN: |
1056 | case SIOCSPGRP: |
1057 | err = -EFAULT; |
1058 | if (get_user(pid, (int __user *)argp)) |
1059 | break; |
1060 | err = f_setown(sock->file, pid, 1); |
1061 | break; |
1062 | case FIOGETOWN: |
1063 | case SIOCGPGRP: |
1064 | err = put_user(f_getown(sock->file), |
1065 | (int __user *)argp); |
1066 | break; |
1067 | case SIOCGIFBR: |
1068 | case SIOCSIFBR: |
1069 | case SIOCBRADDBR: |
1070 | case SIOCBRDELBR: |
1071 | err = -ENOPKG; |
1072 | if (!br_ioctl_hook) |
1073 | request_module("bridge"); |
1074 | |
1075 | mutex_lock(&br_ioctl_mutex); |
1076 | if (br_ioctl_hook) |
1077 | err = br_ioctl_hook(net, cmd, argp); |
1078 | mutex_unlock(&br_ioctl_mutex); |
1079 | break; |
1080 | case SIOCGIFVLAN: |
1081 | case SIOCSIFVLAN: |
1082 | err = -ENOPKG; |
1083 | if (!vlan_ioctl_hook) |
1084 | request_module("8021q"); |
1085 | |
1086 | mutex_lock(&vlan_ioctl_mutex); |
1087 | if (vlan_ioctl_hook) |
1088 | err = vlan_ioctl_hook(net, argp); |
1089 | mutex_unlock(&vlan_ioctl_mutex); |
1090 | break; |
1091 | case SIOCADDDLCI: |
1092 | case SIOCDELDLCI: |
1093 | err = -ENOPKG; |
1094 | if (!dlci_ioctl_hook) |
1095 | request_module("dlci"); |
1096 | |
1097 | mutex_lock(&dlci_ioctl_mutex); |
1098 | if (dlci_ioctl_hook) |
1099 | err = dlci_ioctl_hook(cmd, argp); |
1100 | mutex_unlock(&dlci_ioctl_mutex); |
1101 | break; |
1102 | default: |
1103 | err = sock_do_ioctl(net, sock, cmd, arg); |
1104 | break; |
1105 | } |
1106 | return err; |
1107 | } |
1108 | |
1109 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
1110 | { |
1111 | int err; |
1112 | struct socket *sock = NULL; |
1113 | |
1114 | err = security_socket_create(family, type, protocol, 1); |
1115 | if (err) |
1116 | goto out; |
1117 | |
1118 | sock = sock_alloc(); |
1119 | if (!sock) { |
1120 | err = -ENOMEM; |
1121 | goto out; |
1122 | } |
1123 | |
1124 | sock->type = type; |
1125 | err = security_socket_post_create(sock, family, type, protocol, 1); |
1126 | if (err) |
1127 | goto out_release; |
1128 | |
1129 | out: |
1130 | *res = sock; |
1131 | return err; |
1132 | out_release: |
1133 | sock_release(sock); |
1134 | sock = NULL; |
1135 | goto out; |
1136 | } |
1137 | EXPORT_SYMBOL(sock_create_lite); |
1138 | |
1139 | /* No kernel lock held - perfect */ |
1140 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
1141 | { |
1142 | unsigned int busy_flag = 0; |
1143 | struct socket *sock; |
1144 | |
1145 | /* |
1146 | * We can't return errors to poll, so it's either yes or no. |
1147 | */ |
1148 | sock = file->private_data; |
1149 | |
1150 | if (sk_can_busy_loop(sock->sk)) { |
1151 | /* this socket can poll_ll so tell the system call */ |
1152 | busy_flag = POLL_BUSY_LOOP; |
1153 | |
1154 | /* once, only if requested by syscall */ |
1155 | if (wait && (wait->_key & POLL_BUSY_LOOP)) |
1156 | sk_busy_loop(sock->sk, 1); |
1157 | } |
1158 | |
1159 | return busy_flag | sock->ops->poll(file, sock, wait); |
1160 | } |
1161 | |
1162 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1163 | { |
1164 | struct socket *sock = file->private_data; |
1165 | |
1166 | return sock->ops->mmap(file, sock, vma); |
1167 | } |
1168 | |
1169 | static int sock_close(struct inode *inode, struct file *filp) |
1170 | { |
1171 | sock_release(SOCKET_I(inode)); |
1172 | return 0; |
1173 | } |
1174 | |
1175 | /* |
1176 | * Update the socket async list |
1177 | * |
1178 | * Fasync_list locking strategy. |
1179 | * |
1180 | * 1. fasync_list is modified only under process context socket lock |
1181 | * i.e. under semaphore. |
1182 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) |
1183 | * or under socket lock |
1184 | */ |
1185 | |
1186 | static int sock_fasync(int fd, struct file *filp, int on) |
1187 | { |
1188 | struct socket *sock = filp->private_data; |
1189 | struct sock *sk = sock->sk; |
1190 | struct socket_wq *wq; |
1191 | |
1192 | if (sk == NULL) |
1193 | return -EINVAL; |
1194 | |
1195 | lock_sock(sk); |
1196 | wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk)); |
1197 | fasync_helper(fd, filp, on, &wq->fasync_list); |
1198 | |
1199 | if (!wq->fasync_list) |
1200 | sock_reset_flag(sk, SOCK_FASYNC); |
1201 | else |
1202 | sock_set_flag(sk, SOCK_FASYNC); |
1203 | |
1204 | release_sock(sk); |
1205 | return 0; |
1206 | } |
1207 | |
1208 | /* This function may be called only under socket lock or callback_lock or rcu_lock */ |
1209 | |
1210 | int sock_wake_async(struct socket *sock, int how, int band) |
1211 | { |
1212 | struct socket_wq *wq; |
1213 | |
1214 | if (!sock) |
1215 | return -1; |
1216 | rcu_read_lock(); |
1217 | wq = rcu_dereference(sock->wq); |
1218 | if (!wq || !wq->fasync_list) { |
1219 | rcu_read_unlock(); |
1220 | return -1; |
1221 | } |
1222 | switch (how) { |
1223 | case SOCK_WAKE_WAITD: |
1224 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1225 | break; |
1226 | goto call_kill; |
1227 | case SOCK_WAKE_SPACE: |
1228 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
1229 | break; |
1230 | /* fall through */ |
1231 | case SOCK_WAKE_IO: |
1232 | call_kill: |
1233 | kill_fasync(&wq->fasync_list, SIGIO, band); |
1234 | break; |
1235 | case SOCK_WAKE_URG: |
1236 | kill_fasync(&wq->fasync_list, SIGURG, band); |
1237 | } |
1238 | rcu_read_unlock(); |
1239 | return 0; |
1240 | } |
1241 | EXPORT_SYMBOL(sock_wake_async); |
1242 | |
1243 | int __sock_create(struct net *net, int family, int type, int protocol, |
1244 | struct socket **res, int kern) |
1245 | { |
1246 | int err; |
1247 | struct socket *sock; |
1248 | const struct net_proto_family *pf; |
1249 | |
1250 | /* |
1251 | * Check protocol is in range |
1252 | */ |
1253 | if (family < 0 || family >= NPROTO) |
1254 | return -EAFNOSUPPORT; |
1255 | if (type < 0 || type >= SOCK_MAX) |
1256 | return -EINVAL; |
1257 | |
1258 | /* Compatibility. |
1259 | |
1260 | This uglymoron is moved from INET layer to here to avoid |
1261 | deadlock in module load. |
1262 | */ |
1263 | if (family == PF_INET && type == SOCK_PACKET) { |
1264 | static int warned; |
1265 | if (!warned) { |
1266 | warned = 1; |
1267 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1268 | current->comm); |
1269 | } |
1270 | family = PF_PACKET; |
1271 | } |
1272 | |
1273 | err = security_socket_create(family, type, protocol, kern); |
1274 | if (err) |
1275 | return err; |
1276 | |
1277 | /* |
1278 | * Allocate the socket and allow the family to set things up. if |
1279 | * the protocol is 0, the family is instructed to select an appropriate |
1280 | * default. |
1281 | */ |
1282 | sock = sock_alloc(); |
1283 | if (!sock) { |
1284 | net_warn_ratelimited("socket: no more sockets\n"); |
1285 | return -ENFILE; /* Not exactly a match, but its the |
1286 | closest posix thing */ |
1287 | } |
1288 | |
1289 | sock->type = type; |
1290 | |
1291 | #ifdef CONFIG_MODULES |
1292 | /* Attempt to load a protocol module if the find failed. |
1293 | * |
1294 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user |
1295 | * requested real, full-featured networking support upon configuration. |
1296 | * Otherwise module support will break! |
1297 | */ |
1298 | if (rcu_access_pointer(net_families[family]) == NULL) |
1299 | request_module("net-pf-%d", family); |
1300 | #endif |
1301 | |
1302 | rcu_read_lock(); |
1303 | pf = rcu_dereference(net_families[family]); |
1304 | err = -EAFNOSUPPORT; |
1305 | if (!pf) |
1306 | goto out_release; |
1307 | |
1308 | /* |
1309 | * We will call the ->create function, that possibly is in a loadable |
1310 | * module, so we have to bump that loadable module refcnt first. |
1311 | */ |
1312 | if (!try_module_get(pf->owner)) |
1313 | goto out_release; |
1314 | |
1315 | /* Now protected by module ref count */ |
1316 | rcu_read_unlock(); |
1317 | |
1318 | err = pf->create(net, sock, protocol, kern); |
1319 | if (err < 0) |
1320 | goto out_module_put; |
1321 | |
1322 | /* |
1323 | * Now to bump the refcnt of the [loadable] module that owns this |
1324 | * socket at sock_release time we decrement its refcnt. |
1325 | */ |
1326 | if (!try_module_get(sock->ops->owner)) |
1327 | goto out_module_busy; |
1328 | |
1329 | /* |
1330 | * Now that we're done with the ->create function, the [loadable] |
1331 | * module can have its refcnt decremented |
1332 | */ |
1333 | module_put(pf->owner); |
1334 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1335 | if (err) |
1336 | goto out_sock_release; |
1337 | *res = sock; |
1338 | |
1339 | return 0; |
1340 | |
1341 | out_module_busy: |
1342 | err = -EAFNOSUPPORT; |
1343 | out_module_put: |
1344 | sock->ops = NULL; |
1345 | module_put(pf->owner); |
1346 | out_sock_release: |
1347 | sock_release(sock); |
1348 | return err; |
1349 | |
1350 | out_release: |
1351 | rcu_read_unlock(); |
1352 | goto out_sock_release; |
1353 | } |
1354 | EXPORT_SYMBOL(__sock_create); |
1355 | |
1356 | int sock_create(int family, int type, int protocol, struct socket **res) |
1357 | { |
1358 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1359 | } |
1360 | EXPORT_SYMBOL(sock_create); |
1361 | |
1362 | int sock_create_kern(int family, int type, int protocol, struct socket **res) |
1363 | { |
1364 | return __sock_create(&init_net, family, type, protocol, res, 1); |
1365 | } |
1366 | EXPORT_SYMBOL(sock_create_kern); |
1367 | |
1368 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
1369 | { |
1370 | int retval; |
1371 | struct socket *sock; |
1372 | int flags; |
1373 | |
1374 | /* Check the SOCK_* constants for consistency. */ |
1375 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); |
1376 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); |
1377 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); |
1378 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); |
1379 | |
1380 | flags = type & ~SOCK_TYPE_MASK; |
1381 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
1382 | return -EINVAL; |
1383 | type &= SOCK_TYPE_MASK; |
1384 | |
1385 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1386 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
1387 | |
1388 | retval = sock_create(family, type, protocol, &sock); |
1389 | if (retval < 0) |
1390 | goto out; |
1391 | |
1392 | retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1393 | if (retval < 0) |
1394 | goto out_release; |
1395 | |
1396 | out: |
1397 | /* It may be already another descriptor 8) Not kernel problem. */ |
1398 | return retval; |
1399 | |
1400 | out_release: |
1401 | sock_release(sock); |
1402 | return retval; |
1403 | } |
1404 | |
1405 | /* |
1406 | * Create a pair of connected sockets. |
1407 | */ |
1408 | |
1409 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
1410 | int __user *, usockvec) |
1411 | { |
1412 | struct socket *sock1, *sock2; |
1413 | int fd1, fd2, err; |
1414 | struct file *newfile1, *newfile2; |
1415 | int flags; |
1416 | |
1417 | flags = type & ~SOCK_TYPE_MASK; |
1418 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
1419 | return -EINVAL; |
1420 | type &= SOCK_TYPE_MASK; |
1421 | |
1422 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1423 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
1424 | |
1425 | /* |
1426 | * Obtain the first socket and check if the underlying protocol |
1427 | * supports the socketpair call. |
1428 | */ |
1429 | |
1430 | err = sock_create(family, type, protocol, &sock1); |
1431 | if (err < 0) |
1432 | goto out; |
1433 | |
1434 | err = sock_create(family, type, protocol, &sock2); |
1435 | if (err < 0) |
1436 | goto out_release_1; |
1437 | |
1438 | err = sock1->ops->socketpair(sock1, sock2); |
1439 | if (err < 0) |
1440 | goto out_release_both; |
1441 | |
1442 | fd1 = get_unused_fd_flags(flags); |
1443 | if (unlikely(fd1 < 0)) { |
1444 | err = fd1; |
1445 | goto out_release_both; |
1446 | } |
1447 | fd2 = get_unused_fd_flags(flags); |
1448 | if (unlikely(fd2 < 0)) { |
1449 | err = fd2; |
1450 | put_unused_fd(fd1); |
1451 | goto out_release_both; |
1452 | } |
1453 | |
1454 | newfile1 = sock_alloc_file(sock1, flags, NULL); |
1455 | if (unlikely(IS_ERR(newfile1))) { |
1456 | err = PTR_ERR(newfile1); |
1457 | put_unused_fd(fd1); |
1458 | put_unused_fd(fd2); |
1459 | goto out_release_both; |
1460 | } |
1461 | |
1462 | newfile2 = sock_alloc_file(sock2, flags, NULL); |
1463 | if (IS_ERR(newfile2)) { |
1464 | err = PTR_ERR(newfile2); |
1465 | fput(newfile1); |
1466 | put_unused_fd(fd1); |
1467 | put_unused_fd(fd2); |
1468 | sock_release(sock2); |
1469 | goto out; |
1470 | } |
1471 | |
1472 | audit_fd_pair(fd1, fd2); |
1473 | fd_install(fd1, newfile1); |
1474 | fd_install(fd2, newfile2); |
1475 | /* fd1 and fd2 may be already another descriptors. |
1476 | * Not kernel problem. |
1477 | */ |
1478 | |
1479 | err = put_user(fd1, &usockvec[0]); |
1480 | if (!err) |
1481 | err = put_user(fd2, &usockvec[1]); |
1482 | if (!err) |
1483 | return 0; |
1484 | |
1485 | sys_close(fd2); |
1486 | sys_close(fd1); |
1487 | return err; |
1488 | |
1489 | out_release_both: |
1490 | sock_release(sock2); |
1491 | out_release_1: |
1492 | sock_release(sock1); |
1493 | out: |
1494 | return err; |
1495 | } |
1496 | |
1497 | /* |
1498 | * Bind a name to a socket. Nothing much to do here since it's |
1499 | * the protocol's responsibility to handle the local address. |
1500 | * |
1501 | * We move the socket address to kernel space before we call |
1502 | * the protocol layer (having also checked the address is ok). |
1503 | */ |
1504 | |
1505 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
1506 | { |
1507 | struct socket *sock; |
1508 | struct sockaddr_storage address; |
1509 | int err, fput_needed; |
1510 | |
1511 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1512 | if (sock) { |
1513 | err = move_addr_to_kernel(umyaddr, addrlen, &address); |
1514 | if (err >= 0) { |
1515 | err = security_socket_bind(sock, |
1516 | (struct sockaddr *)&address, |
1517 | addrlen); |
1518 | if (!err) |
1519 | err = sock->ops->bind(sock, |
1520 | (struct sockaddr *) |
1521 | &address, addrlen); |
1522 | } |
1523 | fput_light(sock->file, fput_needed); |
1524 | } |
1525 | return err; |
1526 | } |
1527 | |
1528 | /* |
1529 | * Perform a listen. Basically, we allow the protocol to do anything |
1530 | * necessary for a listen, and if that works, we mark the socket as |
1531 | * ready for listening. |
1532 | */ |
1533 | |
1534 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
1535 | { |
1536 | struct socket *sock; |
1537 | int err, fput_needed; |
1538 | int somaxconn; |
1539 | |
1540 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1541 | if (sock) { |
1542 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; |
1543 | if ((unsigned int)backlog > somaxconn) |
1544 | backlog = somaxconn; |
1545 | |
1546 | err = security_socket_listen(sock, backlog); |
1547 | if (!err) |
1548 | err = sock->ops->listen(sock, backlog); |
1549 | |
1550 | fput_light(sock->file, fput_needed); |
1551 | } |
1552 | return err; |
1553 | } |
1554 | |
1555 | /* |
1556 | * For accept, we attempt to create a new socket, set up the link |
1557 | * with the client, wake up the client, then return the new |
1558 | * connected fd. We collect the address of the connector in kernel |
1559 | * space and move it to user at the very end. This is unclean because |
1560 | * we open the socket then return an error. |
1561 | * |
1562 | * 1003.1g adds the ability to recvmsg() to query connection pending |
1563 | * status to recvmsg. We need to add that support in a way thats |
1564 | * clean when we restucture accept also. |
1565 | */ |
1566 | |
1567 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1568 | int __user *, upeer_addrlen, int, flags) |
1569 | { |
1570 | struct socket *sock, *newsock; |
1571 | struct file *newfile; |
1572 | int err, len, newfd, fput_needed; |
1573 | struct sockaddr_storage address; |
1574 | |
1575 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
1576 | return -EINVAL; |
1577 | |
1578 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1579 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
1580 | |
1581 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1582 | if (!sock) |
1583 | goto out; |
1584 | |
1585 | err = -ENFILE; |
1586 | newsock = sock_alloc(); |
1587 | if (!newsock) |
1588 | goto out_put; |
1589 | |
1590 | newsock->type = sock->type; |
1591 | newsock->ops = sock->ops; |
1592 | |
1593 | /* |
1594 | * We don't need try_module_get here, as the listening socket (sock) |
1595 | * has the protocol module (sock->ops->owner) held. |
1596 | */ |
1597 | __module_get(newsock->ops->owner); |
1598 | |
1599 | newfd = get_unused_fd_flags(flags); |
1600 | if (unlikely(newfd < 0)) { |
1601 | err = newfd; |
1602 | sock_release(newsock); |
1603 | goto out_put; |
1604 | } |
1605 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); |
1606 | if (unlikely(IS_ERR(newfile))) { |
1607 | err = PTR_ERR(newfile); |
1608 | put_unused_fd(newfd); |
1609 | sock_release(newsock); |
1610 | goto out_put; |
1611 | } |
1612 | |
1613 | err = security_socket_accept(sock, newsock); |
1614 | if (err) |
1615 | goto out_fd; |
1616 | |
1617 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1618 | if (err < 0) |
1619 | goto out_fd; |
1620 | |
1621 | if (upeer_sockaddr) { |
1622 | if (newsock->ops->getname(newsock, (struct sockaddr *)&address, |
1623 | &len, 2) < 0) { |
1624 | err = -ECONNABORTED; |
1625 | goto out_fd; |
1626 | } |
1627 | err = move_addr_to_user(&address, |
1628 | len, upeer_sockaddr, upeer_addrlen); |
1629 | if (err < 0) |
1630 | goto out_fd; |
1631 | } |
1632 | |
1633 | /* File flags are not inherited via accept() unlike another OSes. */ |
1634 | |
1635 | fd_install(newfd, newfile); |
1636 | err = newfd; |
1637 | |
1638 | out_put: |
1639 | fput_light(sock->file, fput_needed); |
1640 | out: |
1641 | return err; |
1642 | out_fd: |
1643 | fput(newfile); |
1644 | put_unused_fd(newfd); |
1645 | goto out_put; |
1646 | } |
1647 | |
1648 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1649 | int __user *, upeer_addrlen) |
1650 | { |
1651 | return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
1652 | } |
1653 | |
1654 | /* |
1655 | * Attempt to connect to a socket with the server address. The address |
1656 | * is in user space so we verify it is OK and move it to kernel space. |
1657 | * |
1658 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to |
1659 | * break bindings |
1660 | * |
1661 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and |
1662 | * other SEQPACKET protocols that take time to connect() as it doesn't |
1663 | * include the -EINPROGRESS status for such sockets. |
1664 | */ |
1665 | |
1666 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
1667 | int, addrlen) |
1668 | { |
1669 | struct socket *sock; |
1670 | struct sockaddr_storage address; |
1671 | int err, fput_needed; |
1672 | |
1673 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1674 | if (!sock) |
1675 | goto out; |
1676 | err = move_addr_to_kernel(uservaddr, addrlen, &address); |
1677 | if (err < 0) |
1678 | goto out_put; |
1679 | |
1680 | err = |
1681 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); |
1682 | if (err) |
1683 | goto out_put; |
1684 | |
1685 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, |
1686 | sock->file->f_flags); |
1687 | out_put: |
1688 | fput_light(sock->file, fput_needed); |
1689 | out: |
1690 | return err; |
1691 | } |
1692 | |
1693 | /* |
1694 | * Get the local address ('name') of a socket object. Move the obtained |
1695 | * name to user space. |
1696 | */ |
1697 | |
1698 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
1699 | int __user *, usockaddr_len) |
1700 | { |
1701 | struct socket *sock; |
1702 | struct sockaddr_storage address; |
1703 | int len, err, fput_needed; |
1704 | |
1705 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1706 | if (!sock) |
1707 | goto out; |
1708 | |
1709 | err = security_socket_getsockname(sock); |
1710 | if (err) |
1711 | goto out_put; |
1712 | |
1713 | err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); |
1714 | if (err) |
1715 | goto out_put; |
1716 | err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); |
1717 | |
1718 | out_put: |
1719 | fput_light(sock->file, fput_needed); |
1720 | out: |
1721 | return err; |
1722 | } |
1723 | |
1724 | /* |
1725 | * Get the remote address ('name') of a socket object. Move the obtained |
1726 | * name to user space. |
1727 | */ |
1728 | |
1729 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
1730 | int __user *, usockaddr_len) |
1731 | { |
1732 | struct socket *sock; |
1733 | struct sockaddr_storage address; |
1734 | int len, err, fput_needed; |
1735 | |
1736 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1737 | if (sock != NULL) { |
1738 | err = security_socket_getpeername(sock); |
1739 | if (err) { |
1740 | fput_light(sock->file, fput_needed); |
1741 | return err; |
1742 | } |
1743 | |
1744 | err = |
1745 | sock->ops->getname(sock, (struct sockaddr *)&address, &len, |
1746 | 1); |
1747 | if (!err) |
1748 | err = move_addr_to_user(&address, len, usockaddr, |
1749 | usockaddr_len); |
1750 | fput_light(sock->file, fput_needed); |
1751 | } |
1752 | return err; |
1753 | } |
1754 | |
1755 | /* |
1756 | * Send a datagram to a given address. We move the address into kernel |
1757 | * space and check the user space data area is readable before invoking |
1758 | * the protocol. |
1759 | */ |
1760 | |
1761 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
1762 | unsigned int, flags, struct sockaddr __user *, addr, |
1763 | int, addr_len) |
1764 | { |
1765 | struct socket *sock; |
1766 | struct sockaddr_storage address; |
1767 | int err; |
1768 | struct msghdr msg; |
1769 | struct iovec iov; |
1770 | int fput_needed; |
1771 | |
1772 | if (len > INT_MAX) |
1773 | len = INT_MAX; |
1774 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1775 | if (!sock) |
1776 | goto out; |
1777 | |
1778 | iov.iov_base = buff; |
1779 | iov.iov_len = len; |
1780 | msg.msg_name = NULL; |
1781 | msg.msg_iov = &iov; |
1782 | msg.msg_iovlen = 1; |
1783 | msg.msg_control = NULL; |
1784 | msg.msg_controllen = 0; |
1785 | msg.msg_namelen = 0; |
1786 | if (addr) { |
1787 | err = move_addr_to_kernel(addr, addr_len, &address); |
1788 | if (err < 0) |
1789 | goto out_put; |
1790 | msg.msg_name = (struct sockaddr *)&address; |
1791 | msg.msg_namelen = addr_len; |
1792 | } |
1793 | if (sock->file->f_flags & O_NONBLOCK) |
1794 | flags |= MSG_DONTWAIT; |
1795 | msg.msg_flags = flags; |
1796 | err = sock_sendmsg(sock, &msg, len); |
1797 | |
1798 | out_put: |
1799 | fput_light(sock->file, fput_needed); |
1800 | out: |
1801 | return err; |
1802 | } |
1803 | |
1804 | /* |
1805 | * Send a datagram down a socket. |
1806 | */ |
1807 | |
1808 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
1809 | unsigned int, flags) |
1810 | { |
1811 | return sys_sendto(fd, buff, len, flags, NULL, 0); |
1812 | } |
1813 | |
1814 | /* |
1815 | * Receive a frame from the socket and optionally record the address of the |
1816 | * sender. We verify the buffers are writable and if needed move the |
1817 | * sender address from kernel to user space. |
1818 | */ |
1819 | |
1820 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
1821 | unsigned int, flags, struct sockaddr __user *, addr, |
1822 | int __user *, addr_len) |
1823 | { |
1824 | struct socket *sock; |
1825 | struct iovec iov; |
1826 | struct msghdr msg; |
1827 | struct sockaddr_storage address; |
1828 | int err, err2; |
1829 | int fput_needed; |
1830 | |
1831 | if (size > INT_MAX) |
1832 | size = INT_MAX; |
1833 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1834 | if (!sock) |
1835 | goto out; |
1836 | |
1837 | msg.msg_control = NULL; |
1838 | msg.msg_controllen = 0; |
1839 | msg.msg_iovlen = 1; |
1840 | msg.msg_iov = &iov; |
1841 | iov.iov_len = size; |
1842 | iov.iov_base = ubuf; |
1843 | msg.msg_name = (struct sockaddr *)&address; |
1844 | msg.msg_namelen = sizeof(address); |
1845 | if (sock->file->f_flags & O_NONBLOCK) |
1846 | flags |= MSG_DONTWAIT; |
1847 | err = sock_recvmsg(sock, &msg, size, flags); |
1848 | |
1849 | if (err >= 0 && addr != NULL) { |
1850 | err2 = move_addr_to_user(&address, |
1851 | msg.msg_namelen, addr, addr_len); |
1852 | if (err2 < 0) |
1853 | err = err2; |
1854 | } |
1855 | |
1856 | fput_light(sock->file, fput_needed); |
1857 | out: |
1858 | return err; |
1859 | } |
1860 | |
1861 | /* |
1862 | * Receive a datagram from a socket. |
1863 | */ |
1864 | |
1865 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
1866 | unsigned int flags) |
1867 | { |
1868 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1869 | } |
1870 | |
1871 | /* |
1872 | * Set a socket option. Because we don't know the option lengths we have |
1873 | * to pass the user mode parameter for the protocols to sort out. |
1874 | */ |
1875 | |
1876 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
1877 | char __user *, optval, int, optlen) |
1878 | { |
1879 | int err, fput_needed; |
1880 | struct socket *sock; |
1881 | |
1882 | if (optlen < 0) |
1883 | return -EINVAL; |
1884 | |
1885 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1886 | if (sock != NULL) { |
1887 | err = security_socket_setsockopt(sock, level, optname); |
1888 | if (err) |
1889 | goto out_put; |
1890 | |
1891 | if (level == SOL_SOCKET) |
1892 | err = |
1893 | sock_setsockopt(sock, level, optname, optval, |
1894 | optlen); |
1895 | else |
1896 | err = |
1897 | sock->ops->setsockopt(sock, level, optname, optval, |
1898 | optlen); |
1899 | out_put: |
1900 | fput_light(sock->file, fput_needed); |
1901 | } |
1902 | return err; |
1903 | } |
1904 | |
1905 | /* |
1906 | * Get a socket option. Because we don't know the option lengths we have |
1907 | * to pass a user mode parameter for the protocols to sort out. |
1908 | */ |
1909 | |
1910 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
1911 | char __user *, optval, int __user *, optlen) |
1912 | { |
1913 | int err, fput_needed; |
1914 | struct socket *sock; |
1915 | |
1916 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1917 | if (sock != NULL) { |
1918 | err = security_socket_getsockopt(sock, level, optname); |
1919 | if (err) |
1920 | goto out_put; |
1921 | |
1922 | if (level == SOL_SOCKET) |
1923 | err = |
1924 | sock_getsockopt(sock, level, optname, optval, |
1925 | optlen); |
1926 | else |
1927 | err = |
1928 | sock->ops->getsockopt(sock, level, optname, optval, |
1929 | optlen); |
1930 | out_put: |
1931 | fput_light(sock->file, fput_needed); |
1932 | } |
1933 | return err; |
1934 | } |
1935 | |
1936 | /* |
1937 | * Shutdown a socket. |
1938 | */ |
1939 | |
1940 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
1941 | { |
1942 | int err, fput_needed; |
1943 | struct socket *sock; |
1944 | |
1945 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1946 | if (sock != NULL) { |
1947 | err = security_socket_shutdown(sock, how); |
1948 | if (!err) |
1949 | err = sock->ops->shutdown(sock, how); |
1950 | fput_light(sock->file, fput_needed); |
1951 | } |
1952 | return err; |
1953 | } |
1954 | |
1955 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1956 | * fields which are the same type (int / unsigned) on our platforms. |
1957 | */ |
1958 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) |
1959 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) |
1960 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) |
1961 | |
1962 | struct used_address { |
1963 | struct sockaddr_storage name; |
1964 | unsigned int name_len; |
1965 | }; |
1966 | |
1967 | static int copy_msghdr_from_user(struct msghdr *kmsg, |
1968 | struct msghdr __user *umsg) |
1969 | { |
1970 | if (copy_from_user(kmsg, umsg, sizeof(struct msghdr))) |
1971 | return -EFAULT; |
1972 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
1973 | return -EINVAL; |
1974 | return 0; |
1975 | } |
1976 | |
1977 | static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg, |
1978 | struct msghdr *msg_sys, unsigned int flags, |
1979 | struct used_address *used_address) |
1980 | { |
1981 | struct compat_msghdr __user *msg_compat = |
1982 | (struct compat_msghdr __user *)msg; |
1983 | struct sockaddr_storage address; |
1984 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
1985 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
1986 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
1987 | /* 20 is size of ipv6_pktinfo */ |
1988 | unsigned char *ctl_buf = ctl; |
1989 | int err, ctl_len, total_len; |
1990 | |
1991 | err = -EFAULT; |
1992 | if (MSG_CMSG_COMPAT & flags) { |
1993 | if (get_compat_msghdr(msg_sys, msg_compat)) |
1994 | return -EFAULT; |
1995 | } else { |
1996 | err = copy_msghdr_from_user(msg_sys, msg); |
1997 | if (err) |
1998 | return err; |
1999 | } |
2000 | |
2001 | if (msg_sys->msg_iovlen > UIO_FASTIOV) { |
2002 | err = -EMSGSIZE; |
2003 | if (msg_sys->msg_iovlen > UIO_MAXIOV) |
2004 | goto out; |
2005 | err = -ENOMEM; |
2006 | iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec), |
2007 | GFP_KERNEL); |
2008 | if (!iov) |
2009 | goto out; |
2010 | } |
2011 | |
2012 | /* This will also move the address data into kernel space */ |
2013 | if (MSG_CMSG_COMPAT & flags) { |
2014 | err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ); |
2015 | } else |
2016 | err = verify_iovec(msg_sys, iov, &address, VERIFY_READ); |
2017 | if (err < 0) |
2018 | goto out_freeiov; |
2019 | total_len = err; |
2020 | |
2021 | err = -ENOBUFS; |
2022 | |
2023 | if (msg_sys->msg_controllen > INT_MAX) |
2024 | goto out_freeiov; |
2025 | ctl_len = msg_sys->msg_controllen; |
2026 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
2027 | err = |
2028 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
2029 | sizeof(ctl)); |
2030 | if (err) |
2031 | goto out_freeiov; |
2032 | ctl_buf = msg_sys->msg_control; |
2033 | ctl_len = msg_sys->msg_controllen; |
2034 | } else if (ctl_len) { |
2035 | if (ctl_len > sizeof(ctl)) { |
2036 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
2037 | if (ctl_buf == NULL) |
2038 | goto out_freeiov; |
2039 | } |
2040 | err = -EFAULT; |
2041 | /* |
2042 | * Careful! Before this, msg_sys->msg_control contains a user pointer. |
2043 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted |
2044 | * checking falls down on this. |
2045 | */ |
2046 | if (copy_from_user(ctl_buf, |
2047 | (void __user __force *)msg_sys->msg_control, |
2048 | ctl_len)) |
2049 | goto out_freectl; |
2050 | msg_sys->msg_control = ctl_buf; |
2051 | } |
2052 | msg_sys->msg_flags = flags; |
2053 | |
2054 | if (sock->file->f_flags & O_NONBLOCK) |
2055 | msg_sys->msg_flags |= MSG_DONTWAIT; |
2056 | /* |
2057 | * If this is sendmmsg() and current destination address is same as |
2058 | * previously succeeded address, omit asking LSM's decision. |
2059 | * used_address->name_len is initialized to UINT_MAX so that the first |
2060 | * destination address never matches. |
2061 | */ |
2062 | if (used_address && msg_sys->msg_name && |
2063 | used_address->name_len == msg_sys->msg_namelen && |
2064 | !memcmp(&used_address->name, msg_sys->msg_name, |
2065 | used_address->name_len)) { |
2066 | err = sock_sendmsg_nosec(sock, msg_sys, total_len); |
2067 | goto out_freectl; |
2068 | } |
2069 | err = sock_sendmsg(sock, msg_sys, total_len); |
2070 | /* |
2071 | * If this is sendmmsg() and sending to current destination address was |
2072 | * successful, remember it. |
2073 | */ |
2074 | if (used_address && err >= 0) { |
2075 | used_address->name_len = msg_sys->msg_namelen; |
2076 | if (msg_sys->msg_name) |
2077 | memcpy(&used_address->name, msg_sys->msg_name, |
2078 | used_address->name_len); |
2079 | } |
2080 | |
2081 | out_freectl: |
2082 | if (ctl_buf != ctl) |
2083 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
2084 | out_freeiov: |
2085 | if (iov != iovstack) |
2086 | kfree(iov); |
2087 | out: |
2088 | return err; |
2089 | } |
2090 | |
2091 | /* |
2092 | * BSD sendmsg interface |
2093 | */ |
2094 | |
2095 | long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) |
2096 | { |
2097 | int fput_needed, err; |
2098 | struct msghdr msg_sys; |
2099 | struct socket *sock; |
2100 | |
2101 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2102 | if (!sock) |
2103 | goto out; |
2104 | |
2105 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL); |
2106 | |
2107 | fput_light(sock->file, fput_needed); |
2108 | out: |
2109 | return err; |
2110 | } |
2111 | |
2112 | SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags) |
2113 | { |
2114 | if (flags & MSG_CMSG_COMPAT) |
2115 | return -EINVAL; |
2116 | return __sys_sendmsg(fd, msg, flags); |
2117 | } |
2118 | |
2119 | /* |
2120 | * Linux sendmmsg interface |
2121 | */ |
2122 | |
2123 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, |
2124 | unsigned int flags) |
2125 | { |
2126 | int fput_needed, err, datagrams; |
2127 | struct socket *sock; |
2128 | struct mmsghdr __user *entry; |
2129 | struct compat_mmsghdr __user *compat_entry; |
2130 | struct msghdr msg_sys; |
2131 | struct used_address used_address; |
2132 | |
2133 | if (vlen > UIO_MAXIOV) |
2134 | vlen = UIO_MAXIOV; |
2135 | |
2136 | datagrams = 0; |
2137 | |
2138 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2139 | if (!sock) |
2140 | return err; |
2141 | |
2142 | used_address.name_len = UINT_MAX; |
2143 | entry = mmsg; |
2144 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
2145 | err = 0; |
2146 | |
2147 | while (datagrams < vlen) { |
2148 | if (MSG_CMSG_COMPAT & flags) { |
2149 | err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry, |
2150 | &msg_sys, flags, &used_address); |
2151 | if (err < 0) |
2152 | break; |
2153 | err = __put_user(err, &compat_entry->msg_len); |
2154 | ++compat_entry; |
2155 | } else { |
2156 | err = ___sys_sendmsg(sock, |
2157 | (struct msghdr __user *)entry, |
2158 | &msg_sys, flags, &used_address); |
2159 | if (err < 0) |
2160 | break; |
2161 | err = put_user(err, &entry->msg_len); |
2162 | ++entry; |
2163 | } |
2164 | |
2165 | if (err) |
2166 | break; |
2167 | ++datagrams; |
2168 | } |
2169 | |
2170 | fput_light(sock->file, fput_needed); |
2171 | |
2172 | /* We only return an error if no datagrams were able to be sent */ |
2173 | if (datagrams != 0) |
2174 | return datagrams; |
2175 | |
2176 | return err; |
2177 | } |
2178 | |
2179 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2180 | unsigned int, vlen, unsigned int, flags) |
2181 | { |
2182 | if (flags & MSG_CMSG_COMPAT) |
2183 | return -EINVAL; |
2184 | return __sys_sendmmsg(fd, mmsg, vlen, flags); |
2185 | } |
2186 | |
2187 | static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg, |
2188 | struct msghdr *msg_sys, unsigned int flags, int nosec) |
2189 | { |
2190 | struct compat_msghdr __user *msg_compat = |
2191 | (struct compat_msghdr __user *)msg; |
2192 | struct iovec iovstack[UIO_FASTIOV]; |
2193 | struct iovec *iov = iovstack; |
2194 | unsigned long cmsg_ptr; |
2195 | int err, total_len, len; |
2196 | |
2197 | /* kernel mode address */ |
2198 | struct sockaddr_storage addr; |
2199 | |
2200 | /* user mode address pointers */ |
2201 | struct sockaddr __user *uaddr; |
2202 | int __user *uaddr_len; |
2203 | |
2204 | if (MSG_CMSG_COMPAT & flags) { |
2205 | if (get_compat_msghdr(msg_sys, msg_compat)) |
2206 | return -EFAULT; |
2207 | } else { |
2208 | err = copy_msghdr_from_user(msg_sys, msg); |
2209 | if (err) |
2210 | return err; |
2211 | } |
2212 | |
2213 | if (msg_sys->msg_iovlen > UIO_FASTIOV) { |
2214 | err = -EMSGSIZE; |
2215 | if (msg_sys->msg_iovlen > UIO_MAXIOV) |
2216 | goto out; |
2217 | err = -ENOMEM; |
2218 | iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec), |
2219 | GFP_KERNEL); |
2220 | if (!iov) |
2221 | goto out; |
2222 | } |
2223 | |
2224 | /* |
2225 | * Save the user-mode address (verify_iovec will change the |
2226 | * kernel msghdr to use the kernel address space) |
2227 | */ |
2228 | |
2229 | uaddr = (__force void __user *)msg_sys->msg_name; |
2230 | uaddr_len = COMPAT_NAMELEN(msg); |
2231 | if (MSG_CMSG_COMPAT & flags) { |
2232 | err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE); |
2233 | } else |
2234 | err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE); |
2235 | if (err < 0) |
2236 | goto out_freeiov; |
2237 | total_len = err; |
2238 | |
2239 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
2240 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); |
2241 | |
2242 | if (sock->file->f_flags & O_NONBLOCK) |
2243 | flags |= MSG_DONTWAIT; |
2244 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, |
2245 | total_len, flags); |
2246 | if (err < 0) |
2247 | goto out_freeiov; |
2248 | len = err; |
2249 | |
2250 | if (uaddr != NULL) { |
2251 | err = move_addr_to_user(&addr, |
2252 | msg_sys->msg_namelen, uaddr, |
2253 | uaddr_len); |
2254 | if (err < 0) |
2255 | goto out_freeiov; |
2256 | } |
2257 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
2258 | COMPAT_FLAGS(msg)); |
2259 | if (err) |
2260 | goto out_freeiov; |
2261 | if (MSG_CMSG_COMPAT & flags) |
2262 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
2263 | &msg_compat->msg_controllen); |
2264 | else |
2265 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
2266 | &msg->msg_controllen); |
2267 | if (err) |
2268 | goto out_freeiov; |
2269 | err = len; |
2270 | |
2271 | out_freeiov: |
2272 | if (iov != iovstack) |
2273 | kfree(iov); |
2274 | out: |
2275 | return err; |
2276 | } |
2277 | |
2278 | /* |
2279 | * BSD recvmsg interface |
2280 | */ |
2281 | |
2282 | long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags) |
2283 | { |
2284 | int fput_needed, err; |
2285 | struct msghdr msg_sys; |
2286 | struct socket *sock; |
2287 | |
2288 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2289 | if (!sock) |
2290 | goto out; |
2291 | |
2292 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
2293 | |
2294 | fput_light(sock->file, fput_needed); |
2295 | out: |
2296 | return err; |
2297 | } |
2298 | |
2299 | SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg, |
2300 | unsigned int, flags) |
2301 | { |
2302 | if (flags & MSG_CMSG_COMPAT) |
2303 | return -EINVAL; |
2304 | return __sys_recvmsg(fd, msg, flags); |
2305 | } |
2306 | |
2307 | /* |
2308 | * Linux recvmmsg interface |
2309 | */ |
2310 | |
2311 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, |
2312 | unsigned int flags, struct timespec *timeout) |
2313 | { |
2314 | int fput_needed, err, datagrams; |
2315 | struct socket *sock; |
2316 | struct mmsghdr __user *entry; |
2317 | struct compat_mmsghdr __user *compat_entry; |
2318 | struct msghdr msg_sys; |
2319 | struct timespec end_time; |
2320 | |
2321 | if (timeout && |
2322 | poll_select_set_timeout(&end_time, timeout->tv_sec, |
2323 | timeout->tv_nsec)) |
2324 | return -EINVAL; |
2325 | |
2326 | datagrams = 0; |
2327 | |
2328 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2329 | if (!sock) |
2330 | return err; |
2331 | |
2332 | err = sock_error(sock->sk); |
2333 | if (err) |
2334 | goto out_put; |
2335 | |
2336 | entry = mmsg; |
2337 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
2338 | |
2339 | while (datagrams < vlen) { |
2340 | /* |
2341 | * No need to ask LSM for more than the first datagram. |
2342 | */ |
2343 | if (MSG_CMSG_COMPAT & flags) { |
2344 | err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry, |
2345 | &msg_sys, flags & ~MSG_WAITFORONE, |
2346 | datagrams); |
2347 | if (err < 0) |
2348 | break; |
2349 | err = __put_user(err, &compat_entry->msg_len); |
2350 | ++compat_entry; |
2351 | } else { |
2352 | err = ___sys_recvmsg(sock, |
2353 | (struct msghdr __user *)entry, |
2354 | &msg_sys, flags & ~MSG_WAITFORONE, |
2355 | datagrams); |
2356 | if (err < 0) |
2357 | break; |
2358 | err = put_user(err, &entry->msg_len); |
2359 | ++entry; |
2360 | } |
2361 | |
2362 | if (err) |
2363 | break; |
2364 | ++datagrams; |
2365 | |
2366 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
2367 | if (flags & MSG_WAITFORONE) |
2368 | flags |= MSG_DONTWAIT; |
2369 | |
2370 | if (timeout) { |
2371 | ktime_get_ts(timeout); |
2372 | *timeout = timespec_sub(end_time, *timeout); |
2373 | if (timeout->tv_sec < 0) { |
2374 | timeout->tv_sec = timeout->tv_nsec = 0; |
2375 | break; |
2376 | } |
2377 | |
2378 | /* Timeout, return less than vlen datagrams */ |
2379 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) |
2380 | break; |
2381 | } |
2382 | |
2383 | /* Out of band data, return right away */ |
2384 | if (msg_sys.msg_flags & MSG_OOB) |
2385 | break; |
2386 | } |
2387 | |
2388 | out_put: |
2389 | fput_light(sock->file, fput_needed); |
2390 | |
2391 | if (err == 0) |
2392 | return datagrams; |
2393 | |
2394 | if (datagrams != 0) { |
2395 | /* |
2396 | * We may return less entries than requested (vlen) if the |
2397 | * sock is non block and there aren't enough datagrams... |
2398 | */ |
2399 | if (err != -EAGAIN) { |
2400 | /* |
2401 | * ... or if recvmsg returns an error after we |
2402 | * received some datagrams, where we record the |
2403 | * error to return on the next call or if the |
2404 | * app asks about it using getsockopt(SO_ERROR). |
2405 | */ |
2406 | sock->sk->sk_err = -err; |
2407 | } |
2408 | |
2409 | return datagrams; |
2410 | } |
2411 | |
2412 | return err; |
2413 | } |
2414 | |
2415 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2416 | unsigned int, vlen, unsigned int, flags, |
2417 | struct timespec __user *, timeout) |
2418 | { |
2419 | int datagrams; |
2420 | struct timespec timeout_sys; |
2421 | |
2422 | if (flags & MSG_CMSG_COMPAT) |
2423 | return -EINVAL; |
2424 | |
2425 | if (!timeout) |
2426 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); |
2427 | |
2428 | if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) |
2429 | return -EFAULT; |
2430 | |
2431 | datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); |
2432 | |
2433 | if (datagrams > 0 && |
2434 | copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) |
2435 | datagrams = -EFAULT; |
2436 | |
2437 | return datagrams; |
2438 | } |
2439 | |
2440 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
2441 | /* Argument list sizes for sys_socketcall */ |
2442 | #define AL(x) ((x) * sizeof(unsigned long)) |
2443 | static const unsigned char nargs[21] = { |
2444 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
2445 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), |
2446 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), |
2447 | AL(4), AL(5), AL(4) |
2448 | }; |
2449 | |
2450 | #undef AL |
2451 | |
2452 | /* |
2453 | * System call vectors. |
2454 | * |
2455 | * Argument checking cleaned up. Saved 20% in size. |
2456 | * This function doesn't need to set the kernel lock because |
2457 | * it is set by the callees. |
2458 | */ |
2459 | |
2460 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
2461 | { |
2462 | unsigned long a[AUDITSC_ARGS]; |
2463 | unsigned long a0, a1; |
2464 | int err; |
2465 | unsigned int len; |
2466 | |
2467 | if (call < 1 || call > SYS_SENDMMSG) |
2468 | return -EINVAL; |
2469 | |
2470 | len = nargs[call]; |
2471 | if (len > sizeof(a)) |
2472 | return -EINVAL; |
2473 | |
2474 | /* copy_from_user should be SMP safe. */ |
2475 | if (copy_from_user(a, args, len)) |
2476 | return -EFAULT; |
2477 | |
2478 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
2479 | if (err) |
2480 | return err; |
2481 | |
2482 | a0 = a[0]; |
2483 | a1 = a[1]; |
2484 | |
2485 | switch (call) { |
2486 | case SYS_SOCKET: |
2487 | err = sys_socket(a0, a1, a[2]); |
2488 | break; |
2489 | case SYS_BIND: |
2490 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
2491 | break; |
2492 | case SYS_CONNECT: |
2493 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
2494 | break; |
2495 | case SYS_LISTEN: |
2496 | err = sys_listen(a0, a1); |
2497 | break; |
2498 | case SYS_ACCEPT: |
2499 | err = sys_accept4(a0, (struct sockaddr __user *)a1, |
2500 | (int __user *)a[2], 0); |
2501 | break; |
2502 | case SYS_GETSOCKNAME: |
2503 | err = |
2504 | sys_getsockname(a0, (struct sockaddr __user *)a1, |
2505 | (int __user *)a[2]); |
2506 | break; |
2507 | case SYS_GETPEERNAME: |
2508 | err = |
2509 | sys_getpeername(a0, (struct sockaddr __user *)a1, |
2510 | (int __user *)a[2]); |
2511 | break; |
2512 | case SYS_SOCKETPAIR: |
2513 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
2514 | break; |
2515 | case SYS_SEND: |
2516 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); |
2517 | break; |
2518 | case SYS_SENDTO: |
2519 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2520 | (struct sockaddr __user *)a[4], a[5]); |
2521 | break; |
2522 | case SYS_RECV: |
2523 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); |
2524 | break; |
2525 | case SYS_RECVFROM: |
2526 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2527 | (struct sockaddr __user *)a[4], |
2528 | (int __user *)a[5]); |
2529 | break; |
2530 | case SYS_SHUTDOWN: |
2531 | err = sys_shutdown(a0, a1); |
2532 | break; |
2533 | case SYS_SETSOCKOPT: |
2534 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); |
2535 | break; |
2536 | case SYS_GETSOCKOPT: |
2537 | err = |
2538 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
2539 | (int __user *)a[4]); |
2540 | break; |
2541 | case SYS_SENDMSG: |
2542 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); |
2543 | break; |
2544 | case SYS_SENDMMSG: |
2545 | err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); |
2546 | break; |
2547 | case SYS_RECVMSG: |
2548 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); |
2549 | break; |
2550 | case SYS_RECVMMSG: |
2551 | err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], |
2552 | (struct timespec __user *)a[4]); |
2553 | break; |
2554 | case SYS_ACCEPT4: |
2555 | err = sys_accept4(a0, (struct sockaddr __user *)a1, |
2556 | (int __user *)a[2], a[3]); |
2557 | break; |
2558 | default: |
2559 | err = -EINVAL; |
2560 | break; |
2561 | } |
2562 | return err; |
2563 | } |
2564 | |
2565 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
2566 | |
2567 | /** |
2568 | * sock_register - add a socket protocol handler |
2569 | * @ops: description of protocol |
2570 | * |
2571 | * This function is called by a protocol handler that wants to |
2572 | * advertise its address family, and have it linked into the |
2573 | * socket interface. The value ops->family coresponds to the |
2574 | * socket system call protocol family. |
2575 | */ |
2576 | int sock_register(const struct net_proto_family *ops) |
2577 | { |
2578 | int err; |
2579 | |
2580 | if (ops->family >= NPROTO) { |
2581 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
2582 | NPROTO); |
2583 | return -ENOBUFS; |
2584 | } |
2585 | |
2586 | spin_lock(&net_family_lock); |
2587 | if (rcu_dereference_protected(net_families[ops->family], |
2588 | lockdep_is_held(&net_family_lock))) |
2589 | err = -EEXIST; |
2590 | else { |
2591 | rcu_assign_pointer(net_families[ops->family], ops); |
2592 | err = 0; |
2593 | } |
2594 | spin_unlock(&net_family_lock); |
2595 | |
2596 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
2597 | return err; |
2598 | } |
2599 | EXPORT_SYMBOL(sock_register); |
2600 | |
2601 | /** |
2602 | * sock_unregister - remove a protocol handler |
2603 | * @family: protocol family to remove |
2604 | * |
2605 | * This function is called by a protocol handler that wants to |
2606 | * remove its address family, and have it unlinked from the |
2607 | * new socket creation. |
2608 | * |
2609 | * If protocol handler is a module, then it can use module reference |
2610 | * counts to protect against new references. If protocol handler is not |
2611 | * a module then it needs to provide its own protection in |
2612 | * the ops->create routine. |
2613 | */ |
2614 | void sock_unregister(int family) |
2615 | { |
2616 | BUG_ON(family < 0 || family >= NPROTO); |
2617 | |
2618 | spin_lock(&net_family_lock); |
2619 | RCU_INIT_POINTER(net_families[family], NULL); |
2620 | spin_unlock(&net_family_lock); |
2621 | |
2622 | synchronize_rcu(); |
2623 | |
2624 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
2625 | } |
2626 | EXPORT_SYMBOL(sock_unregister); |
2627 | |
2628 | static int __init sock_init(void) |
2629 | { |
2630 | int err; |
2631 | /* |
2632 | * Initialize the network sysctl infrastructure. |
2633 | */ |
2634 | err = net_sysctl_init(); |
2635 | if (err) |
2636 | goto out; |
2637 | |
2638 | /* |
2639 | * Initialize skbuff SLAB cache |
2640 | */ |
2641 | skb_init(); |
2642 | |
2643 | /* |
2644 | * Initialize the protocols module. |
2645 | */ |
2646 | |
2647 | init_inodecache(); |
2648 | |
2649 | err = register_filesystem(&sock_fs_type); |
2650 | if (err) |
2651 | goto out_fs; |
2652 | sock_mnt = kern_mount(&sock_fs_type); |
2653 | if (IS_ERR(sock_mnt)) { |
2654 | err = PTR_ERR(sock_mnt); |
2655 | goto out_mount; |
2656 | } |
2657 | |
2658 | /* The real protocol initialization is performed in later initcalls. |
2659 | */ |
2660 | |
2661 | #ifdef CONFIG_NETFILTER |
2662 | err = netfilter_init(); |
2663 | if (err) |
2664 | goto out; |
2665 | #endif |
2666 | |
2667 | #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING |
2668 | skb_timestamping_init(); |
2669 | #endif |
2670 | |
2671 | out: |
2672 | return err; |
2673 | |
2674 | out_mount: |
2675 | unregister_filesystem(&sock_fs_type); |
2676 | out_fs: |
2677 | goto out; |
2678 | } |
2679 | |
2680 | core_initcall(sock_init); /* early initcall */ |
2681 | |
2682 | #ifdef CONFIG_PROC_FS |
2683 | void socket_seq_show(struct seq_file *seq) |
2684 | { |
2685 | int cpu; |
2686 | int counter = 0; |
2687 | |
2688 | for_each_possible_cpu(cpu) |
2689 | counter += per_cpu(sockets_in_use, cpu); |
2690 | |
2691 | /* It can be negative, by the way. 8) */ |
2692 | if (counter < 0) |
2693 | counter = 0; |
2694 | |
2695 | seq_printf(seq, "sockets: used %d\n", counter); |
2696 | } |
2697 | #endif /* CONFIG_PROC_FS */ |
2698 | |
2699 | #ifdef CONFIG_COMPAT |
2700 | static int do_siocgstamp(struct net *net, struct socket *sock, |
2701 | unsigned int cmd, void __user *up) |
2702 | { |
2703 | mm_segment_t old_fs = get_fs(); |
2704 | struct timeval ktv; |
2705 | int err; |
2706 | |
2707 | set_fs(KERNEL_DS); |
2708 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); |
2709 | set_fs(old_fs); |
2710 | if (!err) |
2711 | err = compat_put_timeval(&ktv, up); |
2712 | |
2713 | return err; |
2714 | } |
2715 | |
2716 | static int do_siocgstampns(struct net *net, struct socket *sock, |
2717 | unsigned int cmd, void __user *up) |
2718 | { |
2719 | mm_segment_t old_fs = get_fs(); |
2720 | struct timespec kts; |
2721 | int err; |
2722 | |
2723 | set_fs(KERNEL_DS); |
2724 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); |
2725 | set_fs(old_fs); |
2726 | if (!err) |
2727 | err = compat_put_timespec(&kts, up); |
2728 | |
2729 | return err; |
2730 | } |
2731 | |
2732 | static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) |
2733 | { |
2734 | struct ifreq __user *uifr; |
2735 | int err; |
2736 | |
2737 | uifr = compat_alloc_user_space(sizeof(struct ifreq)); |
2738 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) |
2739 | return -EFAULT; |
2740 | |
2741 | err = dev_ioctl(net, SIOCGIFNAME, uifr); |
2742 | if (err) |
2743 | return err; |
2744 | |
2745 | if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) |
2746 | return -EFAULT; |
2747 | |
2748 | return 0; |
2749 | } |
2750 | |
2751 | static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) |
2752 | { |
2753 | struct compat_ifconf ifc32; |
2754 | struct ifconf ifc; |
2755 | struct ifconf __user *uifc; |
2756 | struct compat_ifreq __user *ifr32; |
2757 | struct ifreq __user *ifr; |
2758 | unsigned int i, j; |
2759 | int err; |
2760 | |
2761 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) |
2762 | return -EFAULT; |
2763 | |
2764 | memset(&ifc, 0, sizeof(ifc)); |
2765 | if (ifc32.ifcbuf == 0) { |
2766 | ifc32.ifc_len = 0; |
2767 | ifc.ifc_len = 0; |
2768 | ifc.ifc_req = NULL; |
2769 | uifc = compat_alloc_user_space(sizeof(struct ifconf)); |
2770 | } else { |
2771 | size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * |
2772 | sizeof(struct ifreq); |
2773 | uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); |
2774 | ifc.ifc_len = len; |
2775 | ifr = ifc.ifc_req = (void __user *)(uifc + 1); |
2776 | ifr32 = compat_ptr(ifc32.ifcbuf); |
2777 | for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { |
2778 | if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) |
2779 | return -EFAULT; |
2780 | ifr++; |
2781 | ifr32++; |
2782 | } |
2783 | } |
2784 | if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) |
2785 | return -EFAULT; |
2786 | |
2787 | err = dev_ioctl(net, SIOCGIFCONF, uifc); |
2788 | if (err) |
2789 | return err; |
2790 | |
2791 | if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) |
2792 | return -EFAULT; |
2793 | |
2794 | ifr = ifc.ifc_req; |
2795 | ifr32 = compat_ptr(ifc32.ifcbuf); |
2796 | for (i = 0, j = 0; |
2797 | i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; |
2798 | i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { |
2799 | if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) |
2800 | return -EFAULT; |
2801 | ifr32++; |
2802 | ifr++; |
2803 | } |
2804 | |
2805 | if (ifc32.ifcbuf == 0) { |
2806 | /* Translate from 64-bit structure multiple to |
2807 | * a 32-bit one. |
2808 | */ |
2809 | i = ifc.ifc_len; |
2810 | i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); |
2811 | ifc32.ifc_len = i; |
2812 | } else { |
2813 | ifc32.ifc_len = i; |
2814 | } |
2815 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) |
2816 | return -EFAULT; |
2817 | |
2818 | return 0; |
2819 | } |
2820 | |
2821 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) |
2822 | { |
2823 | struct compat_ethtool_rxnfc __user *compat_rxnfc; |
2824 | bool convert_in = false, convert_out = false; |
2825 | size_t buf_size = ALIGN(sizeof(struct ifreq), 8); |
2826 | struct ethtool_rxnfc __user *rxnfc; |
2827 | struct ifreq __user *ifr; |
2828 | u32 rule_cnt = 0, actual_rule_cnt; |
2829 | u32 ethcmd; |
2830 | u32 data; |
2831 | int ret; |
2832 | |
2833 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) |
2834 | return -EFAULT; |
2835 | |
2836 | compat_rxnfc = compat_ptr(data); |
2837 | |
2838 | if (get_user(ethcmd, &compat_rxnfc->cmd)) |
2839 | return -EFAULT; |
2840 | |
2841 | /* Most ethtool structures are defined without padding. |
2842 | * Unfortunately struct ethtool_rxnfc is an exception. |
2843 | */ |
2844 | switch (ethcmd) { |
2845 | default: |
2846 | break; |
2847 | case ETHTOOL_GRXCLSRLALL: |
2848 | /* Buffer size is variable */ |
2849 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) |
2850 | return -EFAULT; |
2851 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) |
2852 | return -ENOMEM; |
2853 | buf_size += rule_cnt * sizeof(u32); |
2854 | /* fall through */ |
2855 | case ETHTOOL_GRXRINGS: |
2856 | case ETHTOOL_GRXCLSRLCNT: |
2857 | case ETHTOOL_GRXCLSRULE: |
2858 | case ETHTOOL_SRXCLSRLINS: |
2859 | convert_out = true; |
2860 | /* fall through */ |
2861 | case ETHTOOL_SRXCLSRLDEL: |
2862 | buf_size += sizeof(struct ethtool_rxnfc); |
2863 | convert_in = true; |
2864 | break; |
2865 | } |
2866 | |
2867 | ifr = compat_alloc_user_space(buf_size); |
2868 | rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); |
2869 | |
2870 | if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) |
2871 | return -EFAULT; |
2872 | |
2873 | if (put_user(convert_in ? rxnfc : compat_ptr(data), |
2874 | &ifr->ifr_ifru.ifru_data)) |
2875 | return -EFAULT; |
2876 | |
2877 | if (convert_in) { |
2878 | /* We expect there to be holes between fs.m_ext and |
2879 | * fs.ring_cookie and at the end of fs, but nowhere else. |
2880 | */ |
2881 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + |
2882 | sizeof(compat_rxnfc->fs.m_ext) != |
2883 | offsetof(struct ethtool_rxnfc, fs.m_ext) + |
2884 | sizeof(rxnfc->fs.m_ext)); |
2885 | BUILD_BUG_ON( |
2886 | offsetof(struct compat_ethtool_rxnfc, fs.location) - |
2887 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != |
2888 | offsetof(struct ethtool_rxnfc, fs.location) - |
2889 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); |
2890 | |
2891 | if (copy_in_user(rxnfc, compat_rxnfc, |
2892 | (void __user *)(&rxnfc->fs.m_ext + 1) - |
2893 | (void __user *)rxnfc) || |
2894 | copy_in_user(&rxnfc->fs.ring_cookie, |
2895 | &compat_rxnfc->fs.ring_cookie, |
2896 | (void __user *)(&rxnfc->fs.location + 1) - |
2897 | (void __user *)&rxnfc->fs.ring_cookie) || |
2898 | copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, |
2899 | sizeof(rxnfc->rule_cnt))) |
2900 | return -EFAULT; |
2901 | } |
2902 | |
2903 | ret = dev_ioctl(net, SIOCETHTOOL, ifr); |
2904 | if (ret) |
2905 | return ret; |
2906 | |
2907 | if (convert_out) { |
2908 | if (copy_in_user(compat_rxnfc, rxnfc, |
2909 | (const void __user *)(&rxnfc->fs.m_ext + 1) - |
2910 | (const void __user *)rxnfc) || |
2911 | copy_in_user(&compat_rxnfc->fs.ring_cookie, |
2912 | &rxnfc->fs.ring_cookie, |
2913 | (const void __user *)(&rxnfc->fs.location + 1) - |
2914 | (const void __user *)&rxnfc->fs.ring_cookie) || |
2915 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, |
2916 | sizeof(rxnfc->rule_cnt))) |
2917 | return -EFAULT; |
2918 | |
2919 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { |
2920 | /* As an optimisation, we only copy the actual |
2921 | * number of rules that the underlying |
2922 | * function returned. Since Mallory might |
2923 | * change the rule count in user memory, we |
2924 | * check that it is less than the rule count |
2925 | * originally given (as the user buffer size), |
2926 | * which has been range-checked. |
2927 | */ |
2928 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) |
2929 | return -EFAULT; |
2930 | if (actual_rule_cnt < rule_cnt) |
2931 | rule_cnt = actual_rule_cnt; |
2932 | if (copy_in_user(&compat_rxnfc->rule_locs[0], |
2933 | &rxnfc->rule_locs[0], |
2934 | rule_cnt * sizeof(u32))) |
2935 | return -EFAULT; |
2936 | } |
2937 | } |
2938 | |
2939 | return 0; |
2940 | } |
2941 | |
2942 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
2943 | { |
2944 | void __user *uptr; |
2945 | compat_uptr_t uptr32; |
2946 | struct ifreq __user *uifr; |
2947 | |
2948 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
2949 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) |
2950 | return -EFAULT; |
2951 | |
2952 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) |
2953 | return -EFAULT; |
2954 | |
2955 | uptr = compat_ptr(uptr32); |
2956 | |
2957 | if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) |
2958 | return -EFAULT; |
2959 | |
2960 | return dev_ioctl(net, SIOCWANDEV, uifr); |
2961 | } |
2962 | |
2963 | static int bond_ioctl(struct net *net, unsigned int cmd, |
2964 | struct compat_ifreq __user *ifr32) |
2965 | { |
2966 | struct ifreq kifr; |
2967 | struct ifreq __user *uifr; |
2968 | mm_segment_t old_fs; |
2969 | int err; |
2970 | u32 data; |
2971 | void __user *datap; |
2972 | |
2973 | switch (cmd) { |
2974 | case SIOCBONDENSLAVE: |
2975 | case SIOCBONDRELEASE: |
2976 | case SIOCBONDSETHWADDR: |
2977 | case SIOCBONDCHANGEACTIVE: |
2978 | if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) |
2979 | return -EFAULT; |
2980 | |
2981 | old_fs = get_fs(); |
2982 | set_fs(KERNEL_DS); |
2983 | err = dev_ioctl(net, cmd, |
2984 | (struct ifreq __user __force *) &kifr); |
2985 | set_fs(old_fs); |
2986 | |
2987 | return err; |
2988 | case SIOCBONDSLAVEINFOQUERY: |
2989 | case SIOCBONDINFOQUERY: |
2990 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
2991 | if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) |
2992 | return -EFAULT; |
2993 | |
2994 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) |
2995 | return -EFAULT; |
2996 | |
2997 | datap = compat_ptr(data); |
2998 | if (put_user(datap, &uifr->ifr_ifru.ifru_data)) |
2999 | return -EFAULT; |
3000 | |
3001 | return dev_ioctl(net, cmd, uifr); |
3002 | default: |
3003 | return -ENOIOCTLCMD; |
3004 | } |
3005 | } |
3006 | |
3007 | static int siocdevprivate_ioctl(struct net *net, unsigned int cmd, |
3008 | struct compat_ifreq __user *u_ifreq32) |
3009 | { |
3010 | struct ifreq __user *u_ifreq64; |
3011 | char tmp_buf[IFNAMSIZ]; |
3012 | void __user *data64; |
3013 | u32 data32; |
3014 | |
3015 | if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), |
3016 | IFNAMSIZ)) |
3017 | return -EFAULT; |
3018 | if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) |
3019 | return -EFAULT; |
3020 | data64 = compat_ptr(data32); |
3021 | |
3022 | u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); |
3023 | |
3024 | /* Don't check these user accesses, just let that get trapped |
3025 | * in the ioctl handler instead. |
3026 | */ |
3027 | if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], |
3028 | IFNAMSIZ)) |
3029 | return -EFAULT; |
3030 | if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) |
3031 | return -EFAULT; |
3032 | |
3033 | return dev_ioctl(net, cmd, u_ifreq64); |
3034 | } |
3035 | |
3036 | static int dev_ifsioc(struct net *net, struct socket *sock, |
3037 | unsigned int cmd, struct compat_ifreq __user *uifr32) |
3038 | { |
3039 | struct ifreq __user *uifr; |
3040 | int err; |
3041 | |
3042 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
3043 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) |
3044 | return -EFAULT; |
3045 | |
3046 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); |
3047 | |
3048 | if (!err) { |
3049 | switch (cmd) { |
3050 | case SIOCGIFFLAGS: |
3051 | case SIOCGIFMETRIC: |
3052 | case SIOCGIFMTU: |
3053 | case SIOCGIFMEM: |
3054 | case SIOCGIFHWADDR: |
3055 | case SIOCGIFINDEX: |
3056 | case SIOCGIFADDR: |
3057 | case SIOCGIFBRDADDR: |
3058 | case SIOCGIFDSTADDR: |
3059 | case SIOCGIFNETMASK: |
3060 | case SIOCGIFPFLAGS: |
3061 | case SIOCGIFTXQLEN: |
3062 | case SIOCGMIIPHY: |
3063 | case SIOCGMIIREG: |
3064 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) |
3065 | err = -EFAULT; |
3066 | break; |
3067 | } |
3068 | } |
3069 | return err; |
3070 | } |
3071 | |
3072 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, |
3073 | struct compat_ifreq __user *uifr32) |
3074 | { |
3075 | struct ifreq ifr; |
3076 | struct compat_ifmap __user *uifmap32; |
3077 | mm_segment_t old_fs; |
3078 | int err; |
3079 | |
3080 | uifmap32 = &uifr32->ifr_ifru.ifru_map; |
3081 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); |
3082 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
3083 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); |
3084 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); |
3085 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); |
3086 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); |
3087 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); |
3088 | if (err) |
3089 | return -EFAULT; |
3090 | |
3091 | old_fs = get_fs(); |
3092 | set_fs(KERNEL_DS); |
3093 | err = dev_ioctl(net, cmd, (void __user __force *)&ifr); |
3094 | set_fs(old_fs); |
3095 | |
3096 | if (cmd == SIOCGIFMAP && !err) { |
3097 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); |
3098 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
3099 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); |
3100 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); |
3101 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); |
3102 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); |
3103 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); |
3104 | if (err) |
3105 | err = -EFAULT; |
3106 | } |
3107 | return err; |
3108 | } |
3109 | |
3110 | static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32) |
3111 | { |
3112 | void __user *uptr; |
3113 | compat_uptr_t uptr32; |
3114 | struct ifreq __user *uifr; |
3115 | |
3116 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
3117 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) |
3118 | return -EFAULT; |
3119 | |
3120 | if (get_user(uptr32, &uifr32->ifr_data)) |
3121 | return -EFAULT; |
3122 | |
3123 | uptr = compat_ptr(uptr32); |
3124 | |
3125 | if (put_user(uptr, &uifr->ifr_data)) |
3126 | return -EFAULT; |
3127 | |
3128 | return dev_ioctl(net, SIOCSHWTSTAMP, uifr); |
3129 | } |
3130 | |
3131 | struct rtentry32 { |
3132 | u32 rt_pad1; |
3133 | struct sockaddr rt_dst; /* target address */ |
3134 | struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ |
3135 | struct sockaddr rt_genmask; /* target network mask (IP) */ |
3136 | unsigned short rt_flags; |
3137 | short rt_pad2; |
3138 | u32 rt_pad3; |
3139 | unsigned char rt_tos; |
3140 | unsigned char rt_class; |
3141 | short rt_pad4; |
3142 | short rt_metric; /* +1 for binary compatibility! */ |
3143 | /* char * */ u32 rt_dev; /* forcing the device at add */ |
3144 | u32 rt_mtu; /* per route MTU/Window */ |
3145 | u32 rt_window; /* Window clamping */ |
3146 | unsigned short rt_irtt; /* Initial RTT */ |
3147 | }; |
3148 | |
3149 | struct in6_rtmsg32 { |
3150 | struct in6_addr rtmsg_dst; |
3151 | struct in6_addr rtmsg_src; |
3152 | struct in6_addr rtmsg_gateway; |
3153 | u32 rtmsg_type; |
3154 | u16 rtmsg_dst_len; |
3155 | u16 rtmsg_src_len; |
3156 | u32 rtmsg_metric; |
3157 | u32 rtmsg_info; |
3158 | u32 rtmsg_flags; |
3159 | s32 rtmsg_ifindex; |
3160 | }; |
3161 | |
3162 | static int routing_ioctl(struct net *net, struct socket *sock, |
3163 | unsigned int cmd, void __user *argp) |
3164 | { |
3165 | int ret; |
3166 | void *r = NULL; |
3167 | struct in6_rtmsg r6; |
3168 | struct rtentry r4; |
3169 | char devname[16]; |
3170 | u32 rtdev; |
3171 | mm_segment_t old_fs = get_fs(); |
3172 | |
3173 | if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ |
3174 | struct in6_rtmsg32 __user *ur6 = argp; |
3175 | ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), |
3176 | 3 * sizeof(struct in6_addr)); |
3177 | ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); |
3178 | ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); |
3179 | ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); |
3180 | ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); |
3181 | ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); |
3182 | ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); |
3183 | ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); |
3184 | |
3185 | r = (void *) &r6; |
3186 | } else { /* ipv4 */ |
3187 | struct rtentry32 __user *ur4 = argp; |
3188 | ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), |
3189 | 3 * sizeof(struct sockaddr)); |
3190 | ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); |
3191 | ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); |
3192 | ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); |
3193 | ret |= get_user(r4.rt_window, &(ur4->rt_window)); |
3194 | ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); |
3195 | ret |= get_user(rtdev, &(ur4->rt_dev)); |
3196 | if (rtdev) { |
3197 | ret |= copy_from_user(devname, compat_ptr(rtdev), 15); |
3198 | r4.rt_dev = (char __user __force *)devname; |
3199 | devname[15] = 0; |
3200 | } else |
3201 | r4.rt_dev = NULL; |
3202 | |
3203 | r = (void *) &r4; |
3204 | } |
3205 | |
3206 | if (ret) { |
3207 | ret = -EFAULT; |
3208 | goto out; |
3209 | } |
3210 | |
3211 | set_fs(KERNEL_DS); |
3212 | ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); |
3213 | set_fs(old_fs); |
3214 | |
3215 | out: |
3216 | return ret; |
3217 | } |
3218 | |
3219 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE |
3220 | * for some operations; this forces use of the newer bridge-utils that |
3221 | * use compatible ioctls |
3222 | */ |
3223 | static int old_bridge_ioctl(compat_ulong_t __user *argp) |
3224 | { |
3225 | compat_ulong_t tmp; |
3226 | |
3227 | if (get_user(tmp, argp)) |
3228 | return -EFAULT; |
3229 | if (tmp == BRCTL_GET_VERSION) |
3230 | return BRCTL_VERSION + 1; |
3231 | return -EINVAL; |
3232 | } |
3233 | |
3234 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
3235 | unsigned int cmd, unsigned long arg) |
3236 | { |
3237 | void __user *argp = compat_ptr(arg); |
3238 | struct sock *sk = sock->sk; |
3239 | struct net *net = sock_net(sk); |
3240 | |
3241 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
3242 | return siocdevprivate_ioctl(net, cmd, argp); |
3243 | |
3244 | switch (cmd) { |
3245 | case SIOCSIFBR: |
3246 | case SIOCGIFBR: |
3247 | return old_bridge_ioctl(argp); |
3248 | case SIOCGIFNAME: |
3249 | return dev_ifname32(net, argp); |
3250 | case SIOCGIFCONF: |
3251 | return dev_ifconf(net, argp); |
3252 | case SIOCETHTOOL: |
3253 | return ethtool_ioctl(net, argp); |
3254 | case SIOCWANDEV: |
3255 | return compat_siocwandev(net, argp); |
3256 | case SIOCGIFMAP: |
3257 | case SIOCSIFMAP: |
3258 | return compat_sioc_ifmap(net, cmd, argp); |
3259 | case SIOCBONDENSLAVE: |
3260 | case SIOCBONDRELEASE: |
3261 | case SIOCBONDSETHWADDR: |
3262 | case SIOCBONDSLAVEINFOQUERY: |
3263 | case SIOCBONDINFOQUERY: |
3264 | case SIOCBONDCHANGEACTIVE: |
3265 | return bond_ioctl(net, cmd, argp); |
3266 | case SIOCADDRT: |
3267 | case SIOCDELRT: |
3268 | return routing_ioctl(net, sock, cmd, argp); |
3269 | case SIOCGSTAMP: |
3270 | return do_siocgstamp(net, sock, cmd, argp); |
3271 | case SIOCGSTAMPNS: |
3272 | return do_siocgstampns(net, sock, cmd, argp); |
3273 | case SIOCSHWTSTAMP: |
3274 | return compat_siocshwtstamp(net, argp); |
3275 | |
3276 | case FIOSETOWN: |
3277 | case SIOCSPGRP: |
3278 | case FIOGETOWN: |
3279 | case SIOCGPGRP: |
3280 | case SIOCBRADDBR: |
3281 | case SIOCBRDELBR: |
3282 | case SIOCGIFVLAN: |
3283 | case SIOCSIFVLAN: |
3284 | case SIOCADDDLCI: |
3285 | case SIOCDELDLCI: |
3286 | return sock_ioctl(file, cmd, arg); |
3287 | |
3288 | case SIOCGIFFLAGS: |
3289 | case SIOCSIFFLAGS: |
3290 | case SIOCGIFMETRIC: |
3291 | case SIOCSIFMETRIC: |
3292 | case SIOCGIFMTU: |
3293 | case SIOCSIFMTU: |
3294 | case SIOCGIFMEM: |
3295 | case SIOCSIFMEM: |
3296 | case SIOCGIFHWADDR: |
3297 | case SIOCSIFHWADDR: |
3298 | case SIOCADDMULTI: |
3299 | case SIOCDELMULTI: |
3300 | case SIOCGIFINDEX: |
3301 | case SIOCGIFADDR: |
3302 | case SIOCSIFADDR: |
3303 | case SIOCSIFHWBROADCAST: |
3304 | case SIOCDIFADDR: |
3305 | case SIOCGIFBRDADDR: |
3306 | case SIOCSIFBRDADDR: |
3307 | case SIOCGIFDSTADDR: |
3308 | case SIOCSIFDSTADDR: |
3309 | case SIOCGIFNETMASK: |
3310 | case SIOCSIFNETMASK: |
3311 | case SIOCSIFPFLAGS: |
3312 | case SIOCGIFPFLAGS: |
3313 | case SIOCGIFTXQLEN: |
3314 | case SIOCSIFTXQLEN: |
3315 | case SIOCBRADDIF: |
3316 | case SIOCBRDELIF: |
3317 | case SIOCSIFNAME: |
3318 | case SIOCGMIIPHY: |
3319 | case SIOCGMIIREG: |
3320 | case SIOCSMIIREG: |
3321 | return dev_ifsioc(net, sock, cmd, argp); |
3322 | |
3323 | case SIOCSARP: |
3324 | case SIOCGARP: |
3325 | case SIOCDARP: |
3326 | case SIOCATMARK: |
3327 | return sock_do_ioctl(net, sock, cmd, arg); |
3328 | } |
3329 | |
3330 | return -ENOIOCTLCMD; |
3331 | } |
3332 | |
3333 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, |
3334 | unsigned long arg) |
3335 | { |
3336 | struct socket *sock = file->private_data; |
3337 | int ret = -ENOIOCTLCMD; |
3338 | struct sock *sk; |
3339 | struct net *net; |
3340 | |
3341 | sk = sock->sk; |
3342 | net = sock_net(sk); |
3343 | |
3344 | if (sock->ops->compat_ioctl) |
3345 | ret = sock->ops->compat_ioctl(sock, cmd, arg); |
3346 | |
3347 | if (ret == -ENOIOCTLCMD && |
3348 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) |
3349 | ret = compat_wext_handle_ioctl(net, cmd, arg); |
3350 | |
3351 | if (ret == -ENOIOCTLCMD) |
3352 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); |
3353 | |
3354 | return ret; |
3355 | } |
3356 | #endif |
3357 | |
3358 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
3359 | { |
3360 | return sock->ops->bind(sock, addr, addrlen); |
3361 | } |
3362 | EXPORT_SYMBOL(kernel_bind); |
3363 | |
3364 | int kernel_listen(struct socket *sock, int backlog) |
3365 | { |
3366 | return sock->ops->listen(sock, backlog); |
3367 | } |
3368 | EXPORT_SYMBOL(kernel_listen); |
3369 | |
3370 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
3371 | { |
3372 | struct sock *sk = sock->sk; |
3373 | int err; |
3374 | |
3375 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, |
3376 | newsock); |
3377 | if (err < 0) |
3378 | goto done; |
3379 | |
3380 | err = sock->ops->accept(sock, *newsock, flags); |
3381 | if (err < 0) { |
3382 | sock_release(*newsock); |
3383 | *newsock = NULL; |
3384 | goto done; |
3385 | } |
3386 | |
3387 | (*newsock)->ops = sock->ops; |
3388 | __module_get((*newsock)->ops->owner); |
3389 | |
3390 | done: |
3391 | return err; |
3392 | } |
3393 | EXPORT_SYMBOL(kernel_accept); |
3394 | |
3395 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
3396 | int flags) |
3397 | { |
3398 | return sock->ops->connect(sock, addr, addrlen, flags); |
3399 | } |
3400 | EXPORT_SYMBOL(kernel_connect); |
3401 | |
3402 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, |
3403 | int *addrlen) |
3404 | { |
3405 | return sock->ops->getname(sock, addr, addrlen, 0); |
3406 | } |
3407 | EXPORT_SYMBOL(kernel_getsockname); |
3408 | |
3409 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, |
3410 | int *addrlen) |
3411 | { |
3412 | return sock->ops->getname(sock, addr, addrlen, 1); |
3413 | } |
3414 | EXPORT_SYMBOL(kernel_getpeername); |
3415 | |
3416 | int kernel_getsockopt(struct socket *sock, int level, int optname, |
3417 | char *optval, int *optlen) |
3418 | { |
3419 | mm_segment_t oldfs = get_fs(); |
3420 | char __user *uoptval; |
3421 | int __user *uoptlen; |
3422 | int err; |
3423 | |
3424 | uoptval = (char __user __force *) optval; |
3425 | uoptlen = (int __user __force *) optlen; |
3426 | |
3427 | set_fs(KERNEL_DS); |
3428 | if (level == SOL_SOCKET) |
3429 | err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); |
3430 | else |
3431 | err = sock->ops->getsockopt(sock, level, optname, uoptval, |
3432 | uoptlen); |
3433 | set_fs(oldfs); |
3434 | return err; |
3435 | } |
3436 | EXPORT_SYMBOL(kernel_getsockopt); |
3437 | |
3438 | int kernel_setsockopt(struct socket *sock, int level, int optname, |
3439 | char *optval, unsigned int optlen) |
3440 | { |
3441 | mm_segment_t oldfs = get_fs(); |
3442 | char __user *uoptval; |
3443 | int err; |
3444 | |
3445 | uoptval = (char __user __force *) optval; |
3446 | |
3447 | set_fs(KERNEL_DS); |
3448 | if (level == SOL_SOCKET) |
3449 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); |
3450 | else |
3451 | err = sock->ops->setsockopt(sock, level, optname, uoptval, |
3452 | optlen); |
3453 | set_fs(oldfs); |
3454 | return err; |
3455 | } |
3456 | EXPORT_SYMBOL(kernel_setsockopt); |
3457 | |
3458 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
3459 | size_t size, int flags) |
3460 | { |
3461 | if (sock->ops->sendpage) |
3462 | return sock->ops->sendpage(sock, page, offset, size, flags); |
3463 | |
3464 | return sock_no_sendpage(sock, page, offset, size, flags); |
3465 | } |
3466 | EXPORT_SYMBOL(kernel_sendpage); |
3467 | |
3468 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) |
3469 | { |
3470 | mm_segment_t oldfs = get_fs(); |
3471 | int err; |
3472 | |
3473 | set_fs(KERNEL_DS); |
3474 | err = sock->ops->ioctl(sock, cmd, arg); |
3475 | set_fs(oldfs); |
3476 | |
3477 | return err; |
3478 | } |
3479 | EXPORT_SYMBOL(kernel_sock_ioctl); |
3480 | |
3481 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
3482 | { |
3483 | return sock->ops->shutdown(sock, how); |
3484 | } |
3485 | EXPORT_SYMBOL(kernel_sock_shutdown); |
3486 |
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