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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/wanrouter.h> |
73 | #include <linux/if_bridge.h> |
74 | #include <linux/if_frad.h> |
75 | #include <linux/if_vlan.h> |
76 | #include <linux/init.h> |
77 | #include <linux/poll.h> |
78 | #include <linux/cache.h> |
79 | #include <linux/module.h> |
80 | #include <linux/highmem.h> |
81 | #include <linux/mount.h> |
82 | #include <linux/security.h> |
83 | #include <linux/syscalls.h> |
84 | #include <linux/compat.h> |
85 | #include <linux/kmod.h> |
86 | #include <linux/audit.h> |
87 | #include <linux/wireless.h> |
88 | #include <linux/nsproxy.h> |
89 | #include <linux/magic.h> |
90 | #include <linux/slab.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 | |
108 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); |
109 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
110 | unsigned long nr_segs, loff_t pos); |
111 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
112 | unsigned long nr_segs, loff_t pos); |
113 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
114 | |
115 | static int sock_close(struct inode *inode, struct file *file); |
116 | static unsigned int sock_poll(struct file *file, |
117 | struct poll_table_struct *wait); |
118 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
119 | #ifdef CONFIG_COMPAT |
120 | static long compat_sock_ioctl(struct file *file, |
121 | unsigned int cmd, unsigned long arg); |
122 | #endif |
123 | static int sock_fasync(int fd, struct file *filp, int on); |
124 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
125 | int offset, size_t size, loff_t *ppos, int more); |
126 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
127 | struct pipe_inode_info *pipe, size_t len, |
128 | unsigned int flags); |
129 | |
130 | /* |
131 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear |
132 | * in the operation structures but are done directly via the socketcall() multiplexor. |
133 | */ |
134 | |
135 | static const struct file_operations socket_file_ops = { |
136 | .owner = THIS_MODULE, |
137 | .llseek = no_llseek, |
138 | .aio_read = sock_aio_read, |
139 | .aio_write = sock_aio_write, |
140 | .poll = sock_poll, |
141 | .unlocked_ioctl = sock_ioctl, |
142 | #ifdef CONFIG_COMPAT |
143 | .compat_ioctl = compat_sock_ioctl, |
144 | #endif |
145 | .mmap = sock_mmap, |
146 | .open = sock_no_open, /* special open code to disallow open via /proc */ |
147 | .release = sock_close, |
148 | .fasync = sock_fasync, |
149 | .sendpage = sock_sendpage, |
150 | .splice_write = generic_splice_sendpage, |
151 | .splice_read = sock_splice_read, |
152 | }; |
153 | |
154 | /* |
155 | * The protocol list. Each protocol is registered in here. |
156 | */ |
157 | |
158 | static DEFINE_SPINLOCK(net_family_lock); |
159 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; |
160 | |
161 | /* |
162 | * Statistics counters of the socket lists |
163 | */ |
164 | |
165 | static DEFINE_PER_CPU(int, sockets_in_use); |
166 | |
167 | /* |
168 | * Support routines. |
169 | * Move socket addresses back and forth across the kernel/user |
170 | * divide and look after the messy bits. |
171 | */ |
172 | |
173 | /** |
174 | * move_addr_to_kernel - copy a socket address into kernel space |
175 | * @uaddr: Address in user space |
176 | * @kaddr: Address in kernel space |
177 | * @ulen: Length in user space |
178 | * |
179 | * The address is copied into kernel space. If the provided address is |
180 | * too long an error code of -EINVAL is returned. If the copy gives |
181 | * invalid addresses -EFAULT is returned. On a success 0 is returned. |
182 | */ |
183 | |
184 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr) |
185 | { |
186 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
187 | return -EINVAL; |
188 | if (ulen == 0) |
189 | return 0; |
190 | if (copy_from_user(kaddr, uaddr, ulen)) |
191 | return -EFAULT; |
192 | return audit_sockaddr(ulen, kaddr); |
193 | } |
194 | |
195 | /** |
196 | * move_addr_to_user - copy an address to user space |
197 | * @kaddr: kernel space address |
198 | * @klen: length of address in kernel |
199 | * @uaddr: user space address |
200 | * @ulen: pointer to user length field |
201 | * |
202 | * The value pointed to by ulen on entry is the buffer length available. |
203 | * This is overwritten with the buffer space used. -EINVAL is returned |
204 | * if an overlong buffer is specified or a negative buffer size. -EFAULT |
205 | * is returned if either the buffer or the length field are not |
206 | * accessible. |
207 | * After copying the data up to the limit the user specifies, the true |
208 | * length of the data is written over the length limit the user |
209 | * specified. Zero is returned for a success. |
210 | */ |
211 | |
212 | static int move_addr_to_user(struct sockaddr *kaddr, int klen, |
213 | void __user *uaddr, int __user *ulen) |
214 | { |
215 | int err; |
216 | int len; |
217 | |
218 | err = get_user(len, ulen); |
219 | if (err) |
220 | return err; |
221 | if (len > klen) |
222 | len = klen; |
223 | if (len < 0 || len > sizeof(struct sockaddr_storage)) |
224 | return -EINVAL; |
225 | if (len) { |
226 | if (audit_sockaddr(klen, kaddr)) |
227 | return -ENOMEM; |
228 | if (copy_to_user(uaddr, kaddr, len)) |
229 | return -EFAULT; |
230 | } |
231 | /* |
232 | * "fromlen shall refer to the value before truncation.." |
233 | * 1003.1g |
234 | */ |
235 | return __put_user(klen, ulen); |
236 | } |
237 | |
238 | static struct kmem_cache *sock_inode_cachep __read_mostly; |
239 | |
240 | static struct inode *sock_alloc_inode(struct super_block *sb) |
241 | { |
242 | struct socket_alloc *ei; |
243 | struct socket_wq *wq; |
244 | |
245 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
246 | if (!ei) |
247 | return NULL; |
248 | wq = kmalloc(sizeof(*wq), GFP_KERNEL); |
249 | if (!wq) { |
250 | kmem_cache_free(sock_inode_cachep, ei); |
251 | return NULL; |
252 | } |
253 | init_waitqueue_head(&wq->wait); |
254 | wq->fasync_list = NULL; |
255 | RCU_INIT_POINTER(ei->socket.wq, wq); |
256 | |
257 | ei->socket.state = SS_UNCONNECTED; |
258 | ei->socket.flags = 0; |
259 | ei->socket.ops = NULL; |
260 | ei->socket.sk = NULL; |
261 | ei->socket.file = NULL; |
262 | |
263 | return &ei->vfs_inode; |
264 | } |
265 | |
266 | static void sock_destroy_inode(struct inode *inode) |
267 | { |
268 | struct socket_alloc *ei; |
269 | struct socket_wq *wq; |
270 | |
271 | ei = container_of(inode, struct socket_alloc, vfs_inode); |
272 | wq = rcu_dereference_protected(ei->socket.wq, 1); |
273 | kfree_rcu(wq, rcu); |
274 | kmem_cache_free(sock_inode_cachep, ei); |
275 | } |
276 | |
277 | static void init_once(void *foo) |
278 | { |
279 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
280 | |
281 | inode_init_once(&ei->vfs_inode); |
282 | } |
283 | |
284 | static int init_inodecache(void) |
285 | { |
286 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", |
287 | sizeof(struct socket_alloc), |
288 | 0, |
289 | (SLAB_HWCACHE_ALIGN | |
290 | SLAB_RECLAIM_ACCOUNT | |
291 | SLAB_MEM_SPREAD), |
292 | init_once); |
293 | if (sock_inode_cachep == NULL) |
294 | return -ENOMEM; |
295 | return 0; |
296 | } |
297 | |
298 | static const struct super_operations sockfs_ops = { |
299 | .alloc_inode = sock_alloc_inode, |
300 | .destroy_inode = sock_destroy_inode, |
301 | .statfs = simple_statfs, |
302 | }; |
303 | |
304 | /* |
305 | * sockfs_dname() is called from d_path(). |
306 | */ |
307 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) |
308 | { |
309 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", |
310 | dentry->d_inode->i_ino); |
311 | } |
312 | |
313 | static const struct dentry_operations sockfs_dentry_operations = { |
314 | .d_dname = sockfs_dname, |
315 | }; |
316 | |
317 | static struct dentry *sockfs_mount(struct file_system_type *fs_type, |
318 | int flags, const char *dev_name, void *data) |
319 | { |
320 | return mount_pseudo(fs_type, "socket:", &sockfs_ops, |
321 | &sockfs_dentry_operations, SOCKFS_MAGIC); |
322 | } |
323 | |
324 | static struct vfsmount *sock_mnt __read_mostly; |
325 | |
326 | static struct file_system_type sock_fs_type = { |
327 | .name = "sockfs", |
328 | .mount = sockfs_mount, |
329 | .kill_sb = kill_anon_super, |
330 | }; |
331 | |
332 | /* |
333 | * Obtains the first available file descriptor and sets it up for use. |
334 | * |
335 | * These functions create file structures and maps them to fd space |
336 | * of the current process. On success it returns file descriptor |
337 | * and file struct implicitly stored in sock->file. |
338 | * Note that another thread may close file descriptor before we return |
339 | * from this function. We use the fact that now we do not refer |
340 | * to socket after mapping. If one day we will need it, this |
341 | * function will increment ref. count on file by 1. |
342 | * |
343 | * In any case returned fd MAY BE not valid! |
344 | * This race condition is unavoidable |
345 | * with shared fd spaces, we cannot solve it inside kernel, |
346 | * but we take care of internal coherence yet. |
347 | */ |
348 | |
349 | static int sock_alloc_file(struct socket *sock, struct file **f, int flags) |
350 | { |
351 | struct qstr name = { .name = "" }; |
352 | struct path path; |
353 | struct file *file; |
354 | int fd; |
355 | |
356 | fd = get_unused_fd_flags(flags); |
357 | if (unlikely(fd < 0)) |
358 | return fd; |
359 | |
360 | path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); |
361 | if (unlikely(!path.dentry)) { |
362 | put_unused_fd(fd); |
363 | return -ENOMEM; |
364 | } |
365 | path.mnt = mntget(sock_mnt); |
366 | |
367 | d_instantiate(path.dentry, SOCK_INODE(sock)); |
368 | SOCK_INODE(sock)->i_fop = &socket_file_ops; |
369 | |
370 | file = alloc_file(&path, FMODE_READ | FMODE_WRITE, |
371 | &socket_file_ops); |
372 | if (unlikely(!file)) { |
373 | /* drop dentry, keep inode */ |
374 | ihold(path.dentry->d_inode); |
375 | path_put(&path); |
376 | put_unused_fd(fd); |
377 | return -ENFILE; |
378 | } |
379 | |
380 | sock->file = file; |
381 | file->f_flags = O_RDWR | (flags & O_NONBLOCK); |
382 | file->f_pos = 0; |
383 | file->private_data = sock; |
384 | |
385 | *f = file; |
386 | return fd; |
387 | } |
388 | |
389 | int sock_map_fd(struct socket *sock, int flags) |
390 | { |
391 | struct file *newfile; |
392 | int fd = sock_alloc_file(sock, &newfile, flags); |
393 | |
394 | if (likely(fd >= 0)) |
395 | fd_install(fd, newfile); |
396 | |
397 | return fd; |
398 | } |
399 | EXPORT_SYMBOL(sock_map_fd); |
400 | |
401 | static struct socket *sock_from_file(struct file *file, int *err) |
402 | { |
403 | if (file->f_op == &socket_file_ops) |
404 | return file->private_data; /* set in sock_map_fd */ |
405 | |
406 | *err = -ENOTSOCK; |
407 | return NULL; |
408 | } |
409 | |
410 | /** |
411 | * sockfd_lookup - Go from a file number to its socket slot |
412 | * @fd: file handle |
413 | * @err: pointer to an error code return |
414 | * |
415 | * The file handle passed in is locked and the socket it is bound |
416 | * too is returned. If an error occurs the err pointer is overwritten |
417 | * with a negative errno code and NULL is returned. The function checks |
418 | * for both invalid handles and passing a handle which is not a socket. |
419 | * |
420 | * On a success the socket object pointer is returned. |
421 | */ |
422 | |
423 | struct socket *sockfd_lookup(int fd, int *err) |
424 | { |
425 | struct file *file; |
426 | struct socket *sock; |
427 | |
428 | file = fget(fd); |
429 | if (!file) { |
430 | *err = -EBADF; |
431 | return NULL; |
432 | } |
433 | |
434 | sock = sock_from_file(file, err); |
435 | if (!sock) |
436 | fput(file); |
437 | return sock; |
438 | } |
439 | EXPORT_SYMBOL(sockfd_lookup); |
440 | |
441 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
442 | { |
443 | struct file *file; |
444 | struct socket *sock; |
445 | |
446 | *err = -EBADF; |
447 | file = fget_light(fd, fput_needed); |
448 | if (file) { |
449 | sock = sock_from_file(file, err); |
450 | if (sock) |
451 | return sock; |
452 | fput_light(file, *fput_needed); |
453 | } |
454 | return NULL; |
455 | } |
456 | |
457 | /** |
458 | * sock_alloc - allocate a socket |
459 | * |
460 | * Allocate a new inode and socket object. The two are bound together |
461 | * and initialised. The socket is then returned. If we are out of inodes |
462 | * NULL is returned. |
463 | */ |
464 | |
465 | static struct socket *sock_alloc(void) |
466 | { |
467 | struct inode *inode; |
468 | struct socket *sock; |
469 | |
470 | inode = new_inode(sock_mnt->mnt_sb); |
471 | if (!inode) |
472 | return NULL; |
473 | |
474 | sock = SOCKET_I(inode); |
475 | |
476 | kmemcheck_annotate_bitfield(sock, type); |
477 | inode->i_ino = get_next_ino(); |
478 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
479 | inode->i_uid = current_fsuid(); |
480 | inode->i_gid = current_fsgid(); |
481 | |
482 | percpu_add(sockets_in_use, 1); |
483 | return sock; |
484 | } |
485 | |
486 | /* |
487 | * In theory you can't get an open on this inode, but /proc provides |
488 | * a back door. Remember to keep it shut otherwise you'll let the |
489 | * creepy crawlies in. |
490 | */ |
491 | |
492 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
493 | { |
494 | return -ENXIO; |
495 | } |
496 | |
497 | const struct file_operations bad_sock_fops = { |
498 | .owner = THIS_MODULE, |
499 | .open = sock_no_open, |
500 | .llseek = noop_llseek, |
501 | }; |
502 | |
503 | /** |
504 | * sock_release - close a socket |
505 | * @sock: socket to close |
506 | * |
507 | * The socket is released from the protocol stack if it has a release |
508 | * callback, and the inode is then released if the socket is bound to |
509 | * an inode not a file. |
510 | */ |
511 | |
512 | void sock_release(struct socket *sock) |
513 | { |
514 | if (sock->ops) { |
515 | struct module *owner = sock->ops->owner; |
516 | |
517 | sock->ops->release(sock); |
518 | sock->ops = NULL; |
519 | module_put(owner); |
520 | } |
521 | |
522 | if (rcu_dereference_protected(sock->wq, 1)->fasync_list) |
523 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); |
524 | |
525 | percpu_sub(sockets_in_use, 1); |
526 | if (!sock->file) { |
527 | iput(SOCK_INODE(sock)); |
528 | return; |
529 | } |
530 | sock->file = NULL; |
531 | } |
532 | EXPORT_SYMBOL(sock_release); |
533 | |
534 | int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags) |
535 | { |
536 | *tx_flags = 0; |
537 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) |
538 | *tx_flags |= SKBTX_HW_TSTAMP; |
539 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) |
540 | *tx_flags |= SKBTX_SW_TSTAMP; |
541 | return 0; |
542 | } |
543 | EXPORT_SYMBOL(sock_tx_timestamp); |
544 | |
545 | static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock, |
546 | struct msghdr *msg, size_t size) |
547 | { |
548 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
549 | |
550 | sock_update_classid(sock->sk); |
551 | |
552 | si->sock = sock; |
553 | si->scm = NULL; |
554 | si->msg = msg; |
555 | si->size = size; |
556 | |
557 | return sock->ops->sendmsg(iocb, sock, msg, size); |
558 | } |
559 | |
560 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
561 | struct msghdr *msg, size_t size) |
562 | { |
563 | int err = security_socket_sendmsg(sock, msg, size); |
564 | |
565 | return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size); |
566 | } |
567 | |
568 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
569 | { |
570 | struct kiocb iocb; |
571 | struct sock_iocb siocb; |
572 | int ret; |
573 | |
574 | init_sync_kiocb(&iocb, NULL); |
575 | iocb.private = &siocb; |
576 | ret = __sock_sendmsg(&iocb, sock, msg, size); |
577 | if (-EIOCBQUEUED == ret) |
578 | ret = wait_on_sync_kiocb(&iocb); |
579 | return ret; |
580 | } |
581 | EXPORT_SYMBOL(sock_sendmsg); |
582 | |
583 | int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size) |
584 | { |
585 | struct kiocb iocb; |
586 | struct sock_iocb siocb; |
587 | int ret; |
588 | |
589 | init_sync_kiocb(&iocb, NULL); |
590 | iocb.private = &siocb; |
591 | ret = __sock_sendmsg_nosec(&iocb, sock, msg, size); |
592 | if (-EIOCBQUEUED == ret) |
593 | ret = wait_on_sync_kiocb(&iocb); |
594 | return ret; |
595 | } |
596 | |
597 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
598 | struct kvec *vec, size_t num, size_t size) |
599 | { |
600 | mm_segment_t oldfs = get_fs(); |
601 | int result; |
602 | |
603 | set_fs(KERNEL_DS); |
604 | /* |
605 | * the following is safe, since for compiler definitions of kvec and |
606 | * iovec are identical, yielding the same in-core layout and alignment |
607 | */ |
608 | msg->msg_iov = (struct iovec *)vec; |
609 | msg->msg_iovlen = num; |
610 | result = sock_sendmsg(sock, msg, size); |
611 | set_fs(oldfs); |
612 | return result; |
613 | } |
614 | EXPORT_SYMBOL(kernel_sendmsg); |
615 | |
616 | static int ktime2ts(ktime_t kt, struct timespec *ts) |
617 | { |
618 | if (kt.tv64) { |
619 | *ts = ktime_to_timespec(kt); |
620 | return 1; |
621 | } else { |
622 | return 0; |
623 | } |
624 | } |
625 | |
626 | /* |
627 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) |
628 | */ |
629 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
630 | struct sk_buff *skb) |
631 | { |
632 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
633 | struct timespec ts[3]; |
634 | int empty = 1; |
635 | struct skb_shared_hwtstamps *shhwtstamps = |
636 | skb_hwtstamps(skb); |
637 | |
638 | /* Race occurred between timestamp enabling and packet |
639 | receiving. Fill in the current time for now. */ |
640 | if (need_software_tstamp && skb->tstamp.tv64 == 0) |
641 | __net_timestamp(skb); |
642 | |
643 | if (need_software_tstamp) { |
644 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { |
645 | struct timeval tv; |
646 | skb_get_timestamp(skb, &tv); |
647 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, |
648 | sizeof(tv), &tv); |
649 | } else { |
650 | skb_get_timestampns(skb, &ts[0]); |
651 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, |
652 | sizeof(ts[0]), &ts[0]); |
653 | } |
654 | } |
655 | |
656 | |
657 | memset(ts, 0, sizeof(ts)); |
658 | if (skb->tstamp.tv64 && |
659 | sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) { |
660 | skb_get_timestampns(skb, ts + 0); |
661 | empty = 0; |
662 | } |
663 | if (shhwtstamps) { |
664 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) && |
665 | ktime2ts(shhwtstamps->syststamp, ts + 1)) |
666 | empty = 0; |
667 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) && |
668 | ktime2ts(shhwtstamps->hwtstamp, ts + 2)) |
669 | empty = 0; |
670 | } |
671 | if (!empty) |
672 | put_cmsg(msg, SOL_SOCKET, |
673 | SCM_TIMESTAMPING, sizeof(ts), &ts); |
674 | } |
675 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
676 | |
677 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
678 | struct sk_buff *skb) |
679 | { |
680 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount) |
681 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
682 | sizeof(__u32), &skb->dropcount); |
683 | } |
684 | |
685 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
686 | struct sk_buff *skb) |
687 | { |
688 | sock_recv_timestamp(msg, sk, skb); |
689 | sock_recv_drops(msg, sk, skb); |
690 | } |
691 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); |
692 | |
693 | static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock, |
694 | struct msghdr *msg, size_t size, int flags) |
695 | { |
696 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
697 | |
698 | sock_update_classid(sock->sk); |
699 | |
700 | si->sock = sock; |
701 | si->scm = NULL; |
702 | si->msg = msg; |
703 | si->size = size; |
704 | si->flags = flags; |
705 | |
706 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); |
707 | } |
708 | |
709 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
710 | struct msghdr *msg, size_t size, int flags) |
711 | { |
712 | int err = security_socket_recvmsg(sock, msg, size, flags); |
713 | |
714 | return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags); |
715 | } |
716 | |
717 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
718 | size_t size, int flags) |
719 | { |
720 | struct kiocb iocb; |
721 | struct sock_iocb siocb; |
722 | int ret; |
723 | |
724 | init_sync_kiocb(&iocb, NULL); |
725 | iocb.private = &siocb; |
726 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); |
727 | if (-EIOCBQUEUED == ret) |
728 | ret = wait_on_sync_kiocb(&iocb); |
729 | return ret; |
730 | } |
731 | EXPORT_SYMBOL(sock_recvmsg); |
732 | |
733 | static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
734 | size_t size, int flags) |
735 | { |
736 | struct kiocb iocb; |
737 | struct sock_iocb siocb; |
738 | int ret; |
739 | |
740 | init_sync_kiocb(&iocb, NULL); |
741 | iocb.private = &siocb; |
742 | ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags); |
743 | if (-EIOCBQUEUED == ret) |
744 | ret = wait_on_sync_kiocb(&iocb); |
745 | return ret; |
746 | } |
747 | |
748 | /** |
749 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
750 | * @sock: The socket to receive the message from |
751 | * @msg: Received message |
752 | * @vec: Input s/g array for message data |
753 | * @num: Size of input s/g array |
754 | * @size: Number of bytes to read |
755 | * @flags: Message flags (MSG_DONTWAIT, etc...) |
756 | * |
757 | * On return the msg structure contains the scatter/gather array passed in the |
758 | * vec argument. The array is modified so that it consists of the unfilled |
759 | * portion of the original array. |
760 | * |
761 | * The returned value is the total number of bytes received, or an error. |
762 | */ |
763 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
764 | struct kvec *vec, size_t num, size_t size, int flags) |
765 | { |
766 | mm_segment_t oldfs = get_fs(); |
767 | int result; |
768 | |
769 | set_fs(KERNEL_DS); |
770 | /* |
771 | * the following is safe, since for compiler definitions of kvec and |
772 | * iovec are identical, yielding the same in-core layout and alignment |
773 | */ |
774 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
775 | result = sock_recvmsg(sock, msg, size, flags); |
776 | set_fs(oldfs); |
777 | return result; |
778 | } |
779 | EXPORT_SYMBOL(kernel_recvmsg); |
780 | |
781 | static void sock_aio_dtor(struct kiocb *iocb) |
782 | { |
783 | kfree(iocb->private); |
784 | } |
785 | |
786 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
787 | int offset, size_t size, loff_t *ppos, int more) |
788 | { |
789 | struct socket *sock; |
790 | int flags; |
791 | |
792 | sock = file->private_data; |
793 | |
794 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
795 | if (more) |
796 | flags |= MSG_MORE; |
797 | |
798 | return kernel_sendpage(sock, page, offset, size, flags); |
799 | } |
800 | |
801 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
802 | struct pipe_inode_info *pipe, size_t len, |
803 | unsigned int flags) |
804 | { |
805 | struct socket *sock = file->private_data; |
806 | |
807 | if (unlikely(!sock->ops->splice_read)) |
808 | return -EINVAL; |
809 | |
810 | sock_update_classid(sock->sk); |
811 | |
812 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
813 | } |
814 | |
815 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
816 | struct sock_iocb *siocb) |
817 | { |
818 | if (!is_sync_kiocb(iocb)) { |
819 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); |
820 | if (!siocb) |
821 | return NULL; |
822 | iocb->ki_dtor = sock_aio_dtor; |
823 | } |
824 | |
825 | siocb->kiocb = iocb; |
826 | iocb->private = siocb; |
827 | return siocb; |
828 | } |
829 | |
830 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
831 | struct file *file, const struct iovec *iov, |
832 | unsigned long nr_segs) |
833 | { |
834 | struct socket *sock = file->private_data; |
835 | size_t size = 0; |
836 | int i; |
837 | |
838 | for (i = 0; i < nr_segs; i++) |
839 | size += iov[i].iov_len; |
840 | |
841 | msg->msg_name = NULL; |
842 | msg->msg_namelen = 0; |
843 | msg->msg_control = NULL; |
844 | msg->msg_controllen = 0; |
845 | msg->msg_iov = (struct iovec *)iov; |
846 | msg->msg_iovlen = nr_segs; |
847 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
848 | |
849 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); |
850 | } |
851 | |
852 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
853 | unsigned long nr_segs, loff_t pos) |
854 | { |
855 | struct sock_iocb siocb, *x; |
856 | |
857 | if (pos != 0) |
858 | return -ESPIPE; |
859 | |
860 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ |
861 | return 0; |
862 | |
863 | |
864 | x = alloc_sock_iocb(iocb, &siocb); |
865 | if (!x) |
866 | return -ENOMEM; |
867 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
868 | } |
869 | |
870 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
871 | struct file *file, const struct iovec *iov, |
872 | unsigned long nr_segs) |
873 | { |
874 | struct socket *sock = file->private_data; |
875 | size_t size = 0; |
876 | int i; |
877 | |
878 | for (i = 0; i < nr_segs; i++) |
879 | size += iov[i].iov_len; |
880 | |
881 | msg->msg_name = NULL; |
882 | msg->msg_namelen = 0; |
883 | msg->msg_control = NULL; |
884 | msg->msg_controllen = 0; |
885 | msg->msg_iov = (struct iovec *)iov; |
886 | msg->msg_iovlen = nr_segs; |
887 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
888 | if (sock->type == SOCK_SEQPACKET) |
889 | msg->msg_flags |= MSG_EOR; |
890 | |
891 | return __sock_sendmsg(iocb, sock, msg, size); |
892 | } |
893 | |
894 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
895 | unsigned long nr_segs, loff_t pos) |
896 | { |
897 | struct sock_iocb siocb, *x; |
898 | |
899 | if (pos != 0) |
900 | return -ESPIPE; |
901 | |
902 | x = alloc_sock_iocb(iocb, &siocb); |
903 | if (!x) |
904 | return -ENOMEM; |
905 | |
906 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
907 | } |
908 | |
909 | /* |
910 | * Atomic setting of ioctl hooks to avoid race |
911 | * with module unload. |
912 | */ |
913 | |
914 | static DEFINE_MUTEX(br_ioctl_mutex); |
915 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); |
916 | |
917 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
918 | { |
919 | mutex_lock(&br_ioctl_mutex); |
920 | br_ioctl_hook = hook; |
921 | mutex_unlock(&br_ioctl_mutex); |
922 | } |
923 | EXPORT_SYMBOL(brioctl_set); |
924 | |
925 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
926 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
927 | |
928 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
929 | { |
930 | mutex_lock(&vlan_ioctl_mutex); |
931 | vlan_ioctl_hook = hook; |
932 | mutex_unlock(&vlan_ioctl_mutex); |
933 | } |
934 | EXPORT_SYMBOL(vlan_ioctl_set); |
935 | |
936 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
937 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
938 | |
939 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
940 | { |
941 | mutex_lock(&dlci_ioctl_mutex); |
942 | dlci_ioctl_hook = hook; |
943 | mutex_unlock(&dlci_ioctl_mutex); |
944 | } |
945 | EXPORT_SYMBOL(dlci_ioctl_set); |
946 | |
947 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
948 | unsigned int cmd, unsigned long arg) |
949 | { |
950 | int err; |
951 | void __user *argp = (void __user *)arg; |
952 | |
953 | err = sock->ops->ioctl(sock, cmd, arg); |
954 | |
955 | /* |
956 | * If this ioctl is unknown try to hand it down |
957 | * to the NIC driver. |
958 | */ |
959 | if (err == -ENOIOCTLCMD) |
960 | err = dev_ioctl(net, cmd, argp); |
961 | |
962 | return err; |
963 | } |
964 | |
965 | /* |
966 | * With an ioctl, arg may well be a user mode pointer, but we don't know |
967 | * what to do with it - that's up to the protocol still. |
968 | */ |
969 | |
970 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
971 | { |
972 | struct socket *sock; |
973 | struct sock *sk; |
974 | void __user *argp = (void __user *)arg; |
975 | int pid, err; |
976 | struct net *net; |
977 | |
978 | sock = file->private_data; |
979 | sk = sock->sk; |
980 | net = sock_net(sk); |
981 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
982 | err = dev_ioctl(net, cmd, argp); |
983 | } else |
984 | #ifdef CONFIG_WEXT_CORE |
985 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
986 | err = dev_ioctl(net, cmd, argp); |
987 | } else |
988 | #endif |
989 | switch (cmd) { |
990 | case FIOSETOWN: |
991 | case SIOCSPGRP: |
992 | err = -EFAULT; |
993 | if (get_user(pid, (int __user *)argp)) |
994 | break; |
995 | err = f_setown(sock->file, pid, 1); |
996 | break; |
997 | case FIOGETOWN: |
998 | case SIOCGPGRP: |
999 | err = put_user(f_getown(sock->file), |
1000 | (int __user *)argp); |
1001 | break; |
1002 | case SIOCGIFBR: |
1003 | case SIOCSIFBR: |
1004 | case SIOCBRADDBR: |
1005 | case SIOCBRDELBR: |
1006 | err = -ENOPKG; |
1007 | if (!br_ioctl_hook) |
1008 | request_module("bridge"); |
1009 | |
1010 | mutex_lock(&br_ioctl_mutex); |
1011 | if (br_ioctl_hook) |
1012 | err = br_ioctl_hook(net, cmd, argp); |
1013 | mutex_unlock(&br_ioctl_mutex); |
1014 | break; |
1015 | case SIOCGIFVLAN: |
1016 | case SIOCSIFVLAN: |
1017 | err = -ENOPKG; |
1018 | if (!vlan_ioctl_hook) |
1019 | request_module("8021q"); |
1020 | |
1021 | mutex_lock(&vlan_ioctl_mutex); |
1022 | if (vlan_ioctl_hook) |
1023 | err = vlan_ioctl_hook(net, argp); |
1024 | mutex_unlock(&vlan_ioctl_mutex); |
1025 | break; |
1026 | case SIOCADDDLCI: |
1027 | case SIOCDELDLCI: |
1028 | err = -ENOPKG; |
1029 | if (!dlci_ioctl_hook) |
1030 | request_module("dlci"); |
1031 | |
1032 | mutex_lock(&dlci_ioctl_mutex); |
1033 | if (dlci_ioctl_hook) |
1034 | err = dlci_ioctl_hook(cmd, argp); |
1035 | mutex_unlock(&dlci_ioctl_mutex); |
1036 | break; |
1037 | default: |
1038 | err = sock_do_ioctl(net, sock, cmd, arg); |
1039 | break; |
1040 | } |
1041 | return err; |
1042 | } |
1043 | |
1044 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
1045 | { |
1046 | int err; |
1047 | struct socket *sock = NULL; |
1048 | |
1049 | err = security_socket_create(family, type, protocol, 1); |
1050 | if (err) |
1051 | goto out; |
1052 | |
1053 | sock = sock_alloc(); |
1054 | if (!sock) { |
1055 | err = -ENOMEM; |
1056 | goto out; |
1057 | } |
1058 | |
1059 | sock->type = type; |
1060 | err = security_socket_post_create(sock, family, type, protocol, 1); |
1061 | if (err) |
1062 | goto out_release; |
1063 | |
1064 | out: |
1065 | *res = sock; |
1066 | return err; |
1067 | out_release: |
1068 | sock_release(sock); |
1069 | sock = NULL; |
1070 | goto out; |
1071 | } |
1072 | EXPORT_SYMBOL(sock_create_lite); |
1073 | |
1074 | /* No kernel lock held - perfect */ |
1075 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
1076 | { |
1077 | struct socket *sock; |
1078 | |
1079 | /* |
1080 | * We can't return errors to poll, so it's either yes or no. |
1081 | */ |
1082 | sock = file->private_data; |
1083 | return sock->ops->poll(file, sock, wait); |
1084 | } |
1085 | |
1086 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1087 | { |
1088 | struct socket *sock = file->private_data; |
1089 | |
1090 | return sock->ops->mmap(file, sock, vma); |
1091 | } |
1092 | |
1093 | static int sock_close(struct inode *inode, struct file *filp) |
1094 | { |
1095 | /* |
1096 | * It was possible the inode is NULL we were |
1097 | * closing an unfinished socket. |
1098 | */ |
1099 | |
1100 | if (!inode) { |
1101 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
1102 | return 0; |
1103 | } |
1104 | sock_release(SOCKET_I(inode)); |
1105 | return 0; |
1106 | } |
1107 | |
1108 | /* |
1109 | * Update the socket async list |
1110 | * |
1111 | * Fasync_list locking strategy. |
1112 | * |
1113 | * 1. fasync_list is modified only under process context socket lock |
1114 | * i.e. under semaphore. |
1115 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) |
1116 | * or under socket lock |
1117 | */ |
1118 | |
1119 | static int sock_fasync(int fd, struct file *filp, int on) |
1120 | { |
1121 | struct socket *sock = filp->private_data; |
1122 | struct sock *sk = sock->sk; |
1123 | struct socket_wq *wq; |
1124 | |
1125 | if (sk == NULL) |
1126 | return -EINVAL; |
1127 | |
1128 | lock_sock(sk); |
1129 | wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk)); |
1130 | fasync_helper(fd, filp, on, &wq->fasync_list); |
1131 | |
1132 | if (!wq->fasync_list) |
1133 | sock_reset_flag(sk, SOCK_FASYNC); |
1134 | else |
1135 | sock_set_flag(sk, SOCK_FASYNC); |
1136 | |
1137 | release_sock(sk); |
1138 | return 0; |
1139 | } |
1140 | |
1141 | /* This function may be called only under socket lock or callback_lock or rcu_lock */ |
1142 | |
1143 | int sock_wake_async(struct socket *sock, int how, int band) |
1144 | { |
1145 | struct socket_wq *wq; |
1146 | |
1147 | if (!sock) |
1148 | return -1; |
1149 | rcu_read_lock(); |
1150 | wq = rcu_dereference(sock->wq); |
1151 | if (!wq || !wq->fasync_list) { |
1152 | rcu_read_unlock(); |
1153 | return -1; |
1154 | } |
1155 | switch (how) { |
1156 | case SOCK_WAKE_WAITD: |
1157 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
1158 | break; |
1159 | goto call_kill; |
1160 | case SOCK_WAKE_SPACE: |
1161 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
1162 | break; |
1163 | /* fall through */ |
1164 | case SOCK_WAKE_IO: |
1165 | call_kill: |
1166 | kill_fasync(&wq->fasync_list, SIGIO, band); |
1167 | break; |
1168 | case SOCK_WAKE_URG: |
1169 | kill_fasync(&wq->fasync_list, SIGURG, band); |
1170 | } |
1171 | rcu_read_unlock(); |
1172 | return 0; |
1173 | } |
1174 | EXPORT_SYMBOL(sock_wake_async); |
1175 | |
1176 | int __sock_create(struct net *net, int family, int type, int protocol, |
1177 | struct socket **res, int kern) |
1178 | { |
1179 | int err; |
1180 | struct socket *sock; |
1181 | const struct net_proto_family *pf; |
1182 | |
1183 | /* |
1184 | * Check protocol is in range |
1185 | */ |
1186 | if (family < 0 || family >= NPROTO) |
1187 | return -EAFNOSUPPORT; |
1188 | if (type < 0 || type >= SOCK_MAX) |
1189 | return -EINVAL; |
1190 | |
1191 | /* Compatibility. |
1192 | |
1193 | This uglymoron is moved from INET layer to here to avoid |
1194 | deadlock in module load. |
1195 | */ |
1196 | if (family == PF_INET && type == SOCK_PACKET) { |
1197 | static int warned; |
1198 | if (!warned) { |
1199 | warned = 1; |
1200 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1201 | current->comm); |
1202 | } |
1203 | family = PF_PACKET; |
1204 | } |
1205 | |
1206 | err = security_socket_create(family, type, protocol, kern); |
1207 | if (err) |
1208 | return err; |
1209 | |
1210 | /* |
1211 | * Allocate the socket and allow the family to set things up. if |
1212 | * the protocol is 0, the family is instructed to select an appropriate |
1213 | * default. |
1214 | */ |
1215 | sock = sock_alloc(); |
1216 | if (!sock) { |
1217 | if (net_ratelimit()) |
1218 | printk(KERN_WARNING "socket: no more sockets\n"); |
1219 | return -ENFILE; /* Not exactly a match, but its the |
1220 | closest posix thing */ |
1221 | } |
1222 | |
1223 | sock->type = type; |
1224 | |
1225 | #ifdef CONFIG_MODULES |
1226 | /* Attempt to load a protocol module if the find failed. |
1227 | * |
1228 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user |
1229 | * requested real, full-featured networking support upon configuration. |
1230 | * Otherwise module support will break! |
1231 | */ |
1232 | if (rcu_access_pointer(net_families[family]) == NULL) |
1233 | request_module("net-pf-%d", family); |
1234 | #endif |
1235 | |
1236 | rcu_read_lock(); |
1237 | pf = rcu_dereference(net_families[family]); |
1238 | err = -EAFNOSUPPORT; |
1239 | if (!pf) |
1240 | goto out_release; |
1241 | |
1242 | /* |
1243 | * We will call the ->create function, that possibly is in a loadable |
1244 | * module, so we have to bump that loadable module refcnt first. |
1245 | */ |
1246 | if (!try_module_get(pf->owner)) |
1247 | goto out_release; |
1248 | |
1249 | /* Now protected by module ref count */ |
1250 | rcu_read_unlock(); |
1251 | |
1252 | err = pf->create(net, sock, protocol, kern); |
1253 | if (err < 0) |
1254 | goto out_module_put; |
1255 | |
1256 | /* |
1257 | * Now to bump the refcnt of the [loadable] module that owns this |
1258 | * socket at sock_release time we decrement its refcnt. |
1259 | */ |
1260 | if (!try_module_get(sock->ops->owner)) |
1261 | goto out_module_busy; |
1262 | |
1263 | /* |
1264 | * Now that we're done with the ->create function, the [loadable] |
1265 | * module can have its refcnt decremented |
1266 | */ |
1267 | module_put(pf->owner); |
1268 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1269 | if (err) |
1270 | goto out_sock_release; |
1271 | *res = sock; |
1272 | |
1273 | return 0; |
1274 | |
1275 | out_module_busy: |
1276 | err = -EAFNOSUPPORT; |
1277 | out_module_put: |
1278 | sock->ops = NULL; |
1279 | module_put(pf->owner); |
1280 | out_sock_release: |
1281 | sock_release(sock); |
1282 | return err; |
1283 | |
1284 | out_release: |
1285 | rcu_read_unlock(); |
1286 | goto out_sock_release; |
1287 | } |
1288 | EXPORT_SYMBOL(__sock_create); |
1289 | |
1290 | int sock_create(int family, int type, int protocol, struct socket **res) |
1291 | { |
1292 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1293 | } |
1294 | EXPORT_SYMBOL(sock_create); |
1295 | |
1296 | int sock_create_kern(int family, int type, int protocol, struct socket **res) |
1297 | { |
1298 | return __sock_create(&init_net, family, type, protocol, res, 1); |
1299 | } |
1300 | EXPORT_SYMBOL(sock_create_kern); |
1301 | |
1302 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
1303 | { |
1304 | int retval; |
1305 | struct socket *sock; |
1306 | int flags; |
1307 | |
1308 | /* Check the SOCK_* constants for consistency. */ |
1309 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); |
1310 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); |
1311 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); |
1312 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); |
1313 | |
1314 | flags = type & ~SOCK_TYPE_MASK; |
1315 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
1316 | return -EINVAL; |
1317 | type &= SOCK_TYPE_MASK; |
1318 | |
1319 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1320 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
1321 | |
1322 | retval = sock_create(family, type, protocol, &sock); |
1323 | if (retval < 0) |
1324 | goto out; |
1325 | |
1326 | retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1327 | if (retval < 0) |
1328 | goto out_release; |
1329 | |
1330 | out: |
1331 | /* It may be already another descriptor 8) Not kernel problem. */ |
1332 | return retval; |
1333 | |
1334 | out_release: |
1335 | sock_release(sock); |
1336 | return retval; |
1337 | } |
1338 | |
1339 | /* |
1340 | * Create a pair of connected sockets. |
1341 | */ |
1342 | |
1343 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
1344 | int __user *, usockvec) |
1345 | { |
1346 | struct socket *sock1, *sock2; |
1347 | int fd1, fd2, err; |
1348 | struct file *newfile1, *newfile2; |
1349 | int flags; |
1350 | |
1351 | flags = type & ~SOCK_TYPE_MASK; |
1352 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
1353 | return -EINVAL; |
1354 | type &= SOCK_TYPE_MASK; |
1355 | |
1356 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1357 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
1358 | |
1359 | /* |
1360 | * Obtain the first socket and check if the underlying protocol |
1361 | * supports the socketpair call. |
1362 | */ |
1363 | |
1364 | err = sock_create(family, type, protocol, &sock1); |
1365 | if (err < 0) |
1366 | goto out; |
1367 | |
1368 | err = sock_create(family, type, protocol, &sock2); |
1369 | if (err < 0) |
1370 | goto out_release_1; |
1371 | |
1372 | err = sock1->ops->socketpair(sock1, sock2); |
1373 | if (err < 0) |
1374 | goto out_release_both; |
1375 | |
1376 | fd1 = sock_alloc_file(sock1, &newfile1, flags); |
1377 | if (unlikely(fd1 < 0)) { |
1378 | err = fd1; |
1379 | goto out_release_both; |
1380 | } |
1381 | |
1382 | fd2 = sock_alloc_file(sock2, &newfile2, flags); |
1383 | if (unlikely(fd2 < 0)) { |
1384 | err = fd2; |
1385 | fput(newfile1); |
1386 | put_unused_fd(fd1); |
1387 | sock_release(sock2); |
1388 | goto out; |
1389 | } |
1390 | |
1391 | audit_fd_pair(fd1, fd2); |
1392 | fd_install(fd1, newfile1); |
1393 | fd_install(fd2, newfile2); |
1394 | /* fd1 and fd2 may be already another descriptors. |
1395 | * Not kernel problem. |
1396 | */ |
1397 | |
1398 | err = put_user(fd1, &usockvec[0]); |
1399 | if (!err) |
1400 | err = put_user(fd2, &usockvec[1]); |
1401 | if (!err) |
1402 | return 0; |
1403 | |
1404 | sys_close(fd2); |
1405 | sys_close(fd1); |
1406 | return err; |
1407 | |
1408 | out_release_both: |
1409 | sock_release(sock2); |
1410 | out_release_1: |
1411 | sock_release(sock1); |
1412 | out: |
1413 | return err; |
1414 | } |
1415 | |
1416 | /* |
1417 | * Bind a name to a socket. Nothing much to do here since it's |
1418 | * the protocol's responsibility to handle the local address. |
1419 | * |
1420 | * We move the socket address to kernel space before we call |
1421 | * the protocol layer (having also checked the address is ok). |
1422 | */ |
1423 | |
1424 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
1425 | { |
1426 | struct socket *sock; |
1427 | struct sockaddr_storage address; |
1428 | int err, fput_needed; |
1429 | |
1430 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1431 | if (sock) { |
1432 | err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address); |
1433 | if (err >= 0) { |
1434 | err = security_socket_bind(sock, |
1435 | (struct sockaddr *)&address, |
1436 | addrlen); |
1437 | if (!err) |
1438 | err = sock->ops->bind(sock, |
1439 | (struct sockaddr *) |
1440 | &address, addrlen); |
1441 | } |
1442 | fput_light(sock->file, fput_needed); |
1443 | } |
1444 | return err; |
1445 | } |
1446 | |
1447 | /* |
1448 | * Perform a listen. Basically, we allow the protocol to do anything |
1449 | * necessary for a listen, and if that works, we mark the socket as |
1450 | * ready for listening. |
1451 | */ |
1452 | |
1453 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
1454 | { |
1455 | struct socket *sock; |
1456 | int err, fput_needed; |
1457 | int somaxconn; |
1458 | |
1459 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1460 | if (sock) { |
1461 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; |
1462 | if ((unsigned)backlog > somaxconn) |
1463 | backlog = somaxconn; |
1464 | |
1465 | err = security_socket_listen(sock, backlog); |
1466 | if (!err) |
1467 | err = sock->ops->listen(sock, backlog); |
1468 | |
1469 | fput_light(sock->file, fput_needed); |
1470 | } |
1471 | return err; |
1472 | } |
1473 | |
1474 | /* |
1475 | * For accept, we attempt to create a new socket, set up the link |
1476 | * with the client, wake up the client, then return the new |
1477 | * connected fd. We collect the address of the connector in kernel |
1478 | * space and move it to user at the very end. This is unclean because |
1479 | * we open the socket then return an error. |
1480 | * |
1481 | * 1003.1g adds the ability to recvmsg() to query connection pending |
1482 | * status to recvmsg. We need to add that support in a way thats |
1483 | * clean when we restucture accept also. |
1484 | */ |
1485 | |
1486 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1487 | int __user *, upeer_addrlen, int, flags) |
1488 | { |
1489 | struct socket *sock, *newsock; |
1490 | struct file *newfile; |
1491 | int err, len, newfd, fput_needed; |
1492 | struct sockaddr_storage address; |
1493 | |
1494 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
1495 | return -EINVAL; |
1496 | |
1497 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1498 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
1499 | |
1500 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1501 | if (!sock) |
1502 | goto out; |
1503 | |
1504 | err = -ENFILE; |
1505 | newsock = sock_alloc(); |
1506 | if (!newsock) |
1507 | goto out_put; |
1508 | |
1509 | newsock->type = sock->type; |
1510 | newsock->ops = sock->ops; |
1511 | |
1512 | /* |
1513 | * We don't need try_module_get here, as the listening socket (sock) |
1514 | * has the protocol module (sock->ops->owner) held. |
1515 | */ |
1516 | __module_get(newsock->ops->owner); |
1517 | |
1518 | newfd = sock_alloc_file(newsock, &newfile, flags); |
1519 | if (unlikely(newfd < 0)) { |
1520 | err = newfd; |
1521 | sock_release(newsock); |
1522 | goto out_put; |
1523 | } |
1524 | |
1525 | err = security_socket_accept(sock, newsock); |
1526 | if (err) |
1527 | goto out_fd; |
1528 | |
1529 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
1530 | if (err < 0) |
1531 | goto out_fd; |
1532 | |
1533 | if (upeer_sockaddr) { |
1534 | if (newsock->ops->getname(newsock, (struct sockaddr *)&address, |
1535 | &len, 2) < 0) { |
1536 | err = -ECONNABORTED; |
1537 | goto out_fd; |
1538 | } |
1539 | err = move_addr_to_user((struct sockaddr *)&address, |
1540 | len, upeer_sockaddr, upeer_addrlen); |
1541 | if (err < 0) |
1542 | goto out_fd; |
1543 | } |
1544 | |
1545 | /* File flags are not inherited via accept() unlike another OSes. */ |
1546 | |
1547 | fd_install(newfd, newfile); |
1548 | err = newfd; |
1549 | |
1550 | out_put: |
1551 | fput_light(sock->file, fput_needed); |
1552 | out: |
1553 | return err; |
1554 | out_fd: |
1555 | fput(newfile); |
1556 | put_unused_fd(newfd); |
1557 | goto out_put; |
1558 | } |
1559 | |
1560 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1561 | int __user *, upeer_addrlen) |
1562 | { |
1563 | return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
1564 | } |
1565 | |
1566 | /* |
1567 | * Attempt to connect to a socket with the server address. The address |
1568 | * is in user space so we verify it is OK and move it to kernel space. |
1569 | * |
1570 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to |
1571 | * break bindings |
1572 | * |
1573 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and |
1574 | * other SEQPACKET protocols that take time to connect() as it doesn't |
1575 | * include the -EINPROGRESS status for such sockets. |
1576 | */ |
1577 | |
1578 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
1579 | int, addrlen) |
1580 | { |
1581 | struct socket *sock; |
1582 | struct sockaddr_storage address; |
1583 | int err, fput_needed; |
1584 | |
1585 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1586 | if (!sock) |
1587 | goto out; |
1588 | err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address); |
1589 | if (err < 0) |
1590 | goto out_put; |
1591 | |
1592 | err = |
1593 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); |
1594 | if (err) |
1595 | goto out_put; |
1596 | |
1597 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, |
1598 | sock->file->f_flags); |
1599 | out_put: |
1600 | fput_light(sock->file, fput_needed); |
1601 | out: |
1602 | return err; |
1603 | } |
1604 | |
1605 | /* |
1606 | * Get the local address ('name') of a socket object. Move the obtained |
1607 | * name to user space. |
1608 | */ |
1609 | |
1610 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
1611 | int __user *, usockaddr_len) |
1612 | { |
1613 | struct socket *sock; |
1614 | struct sockaddr_storage address; |
1615 | int len, err, fput_needed; |
1616 | |
1617 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1618 | if (!sock) |
1619 | goto out; |
1620 | |
1621 | err = security_socket_getsockname(sock); |
1622 | if (err) |
1623 | goto out_put; |
1624 | |
1625 | err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); |
1626 | if (err) |
1627 | goto out_put; |
1628 | err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len); |
1629 | |
1630 | out_put: |
1631 | fput_light(sock->file, fput_needed); |
1632 | out: |
1633 | return err; |
1634 | } |
1635 | |
1636 | /* |
1637 | * Get the remote address ('name') of a socket object. Move the obtained |
1638 | * name to user space. |
1639 | */ |
1640 | |
1641 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
1642 | int __user *, usockaddr_len) |
1643 | { |
1644 | struct socket *sock; |
1645 | struct sockaddr_storage address; |
1646 | int len, err, fput_needed; |
1647 | |
1648 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1649 | if (sock != NULL) { |
1650 | err = security_socket_getpeername(sock); |
1651 | if (err) { |
1652 | fput_light(sock->file, fput_needed); |
1653 | return err; |
1654 | } |
1655 | |
1656 | err = |
1657 | sock->ops->getname(sock, (struct sockaddr *)&address, &len, |
1658 | 1); |
1659 | if (!err) |
1660 | err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, |
1661 | usockaddr_len); |
1662 | fput_light(sock->file, fput_needed); |
1663 | } |
1664 | return err; |
1665 | } |
1666 | |
1667 | /* |
1668 | * Send a datagram to a given address. We move the address into kernel |
1669 | * space and check the user space data area is readable before invoking |
1670 | * the protocol. |
1671 | */ |
1672 | |
1673 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
1674 | unsigned, flags, struct sockaddr __user *, addr, |
1675 | int, addr_len) |
1676 | { |
1677 | struct socket *sock; |
1678 | struct sockaddr_storage address; |
1679 | int err; |
1680 | struct msghdr msg; |
1681 | struct iovec iov; |
1682 | int fput_needed; |
1683 | |
1684 | if (len > INT_MAX) |
1685 | len = INT_MAX; |
1686 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1687 | if (!sock) |
1688 | goto out; |
1689 | |
1690 | iov.iov_base = buff; |
1691 | iov.iov_len = len; |
1692 | msg.msg_name = NULL; |
1693 | msg.msg_iov = &iov; |
1694 | msg.msg_iovlen = 1; |
1695 | msg.msg_control = NULL; |
1696 | msg.msg_controllen = 0; |
1697 | msg.msg_namelen = 0; |
1698 | if (addr) { |
1699 | err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address); |
1700 | if (err < 0) |
1701 | goto out_put; |
1702 | msg.msg_name = (struct sockaddr *)&address; |
1703 | msg.msg_namelen = addr_len; |
1704 | } |
1705 | if (sock->file->f_flags & O_NONBLOCK) |
1706 | flags |= MSG_DONTWAIT; |
1707 | msg.msg_flags = flags; |
1708 | err = sock_sendmsg(sock, &msg, len); |
1709 | |
1710 | out_put: |
1711 | fput_light(sock->file, fput_needed); |
1712 | out: |
1713 | return err; |
1714 | } |
1715 | |
1716 | /* |
1717 | * Send a datagram down a socket. |
1718 | */ |
1719 | |
1720 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
1721 | unsigned, flags) |
1722 | { |
1723 | return sys_sendto(fd, buff, len, flags, NULL, 0); |
1724 | } |
1725 | |
1726 | /* |
1727 | * Receive a frame from the socket and optionally record the address of the |
1728 | * sender. We verify the buffers are writable and if needed move the |
1729 | * sender address from kernel to user space. |
1730 | */ |
1731 | |
1732 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
1733 | unsigned, flags, struct sockaddr __user *, addr, |
1734 | int __user *, addr_len) |
1735 | { |
1736 | struct socket *sock; |
1737 | struct iovec iov; |
1738 | struct msghdr msg; |
1739 | struct sockaddr_storage address; |
1740 | int err, err2; |
1741 | int fput_needed; |
1742 | |
1743 | if (size > INT_MAX) |
1744 | size = INT_MAX; |
1745 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1746 | if (!sock) |
1747 | goto out; |
1748 | |
1749 | msg.msg_control = NULL; |
1750 | msg.msg_controllen = 0; |
1751 | msg.msg_iovlen = 1; |
1752 | msg.msg_iov = &iov; |
1753 | iov.iov_len = size; |
1754 | iov.iov_base = ubuf; |
1755 | msg.msg_name = (struct sockaddr *)&address; |
1756 | msg.msg_namelen = sizeof(address); |
1757 | if (sock->file->f_flags & O_NONBLOCK) |
1758 | flags |= MSG_DONTWAIT; |
1759 | err = sock_recvmsg(sock, &msg, size, flags); |
1760 | |
1761 | if (err >= 0 && addr != NULL) { |
1762 | err2 = move_addr_to_user((struct sockaddr *)&address, |
1763 | msg.msg_namelen, addr, addr_len); |
1764 | if (err2 < 0) |
1765 | err = err2; |
1766 | } |
1767 | |
1768 | fput_light(sock->file, fput_needed); |
1769 | out: |
1770 | return err; |
1771 | } |
1772 | |
1773 | /* |
1774 | * Receive a datagram from a socket. |
1775 | */ |
1776 | |
1777 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
1778 | unsigned flags) |
1779 | { |
1780 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1781 | } |
1782 | |
1783 | /* |
1784 | * Set a socket option. Because we don't know the option lengths we have |
1785 | * to pass the user mode parameter for the protocols to sort out. |
1786 | */ |
1787 | |
1788 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
1789 | char __user *, optval, int, optlen) |
1790 | { |
1791 | int err, fput_needed; |
1792 | struct socket *sock; |
1793 | |
1794 | if (optlen < 0) |
1795 | return -EINVAL; |
1796 | |
1797 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1798 | if (sock != NULL) { |
1799 | err = security_socket_setsockopt(sock, level, optname); |
1800 | if (err) |
1801 | goto out_put; |
1802 | |
1803 | if (level == SOL_SOCKET) |
1804 | err = |
1805 | sock_setsockopt(sock, level, optname, optval, |
1806 | optlen); |
1807 | else |
1808 | err = |
1809 | sock->ops->setsockopt(sock, level, optname, optval, |
1810 | optlen); |
1811 | out_put: |
1812 | fput_light(sock->file, fput_needed); |
1813 | } |
1814 | return err; |
1815 | } |
1816 | |
1817 | /* |
1818 | * Get a socket option. Because we don't know the option lengths we have |
1819 | * to pass a user mode parameter for the protocols to sort out. |
1820 | */ |
1821 | |
1822 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
1823 | char __user *, optval, int __user *, optlen) |
1824 | { |
1825 | int err, fput_needed; |
1826 | struct socket *sock; |
1827 | |
1828 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1829 | if (sock != NULL) { |
1830 | err = security_socket_getsockopt(sock, level, optname); |
1831 | if (err) |
1832 | goto out_put; |
1833 | |
1834 | if (level == SOL_SOCKET) |
1835 | err = |
1836 | sock_getsockopt(sock, level, optname, optval, |
1837 | optlen); |
1838 | else |
1839 | err = |
1840 | sock->ops->getsockopt(sock, level, optname, optval, |
1841 | optlen); |
1842 | out_put: |
1843 | fput_light(sock->file, fput_needed); |
1844 | } |
1845 | return err; |
1846 | } |
1847 | |
1848 | /* |
1849 | * Shutdown a socket. |
1850 | */ |
1851 | |
1852 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
1853 | { |
1854 | int err, fput_needed; |
1855 | struct socket *sock; |
1856 | |
1857 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1858 | if (sock != NULL) { |
1859 | err = security_socket_shutdown(sock, how); |
1860 | if (!err) |
1861 | err = sock->ops->shutdown(sock, how); |
1862 | fput_light(sock->file, fput_needed); |
1863 | } |
1864 | return err; |
1865 | } |
1866 | |
1867 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1868 | * fields which are the same type (int / unsigned) on our platforms. |
1869 | */ |
1870 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) |
1871 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) |
1872 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) |
1873 | |
1874 | static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg, |
1875 | struct msghdr *msg_sys, unsigned flags, int nosec) |
1876 | { |
1877 | struct compat_msghdr __user *msg_compat = |
1878 | (struct compat_msghdr __user *)msg; |
1879 | struct sockaddr_storage address; |
1880 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
1881 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
1882 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
1883 | /* 20 is size of ipv6_pktinfo */ |
1884 | unsigned char *ctl_buf = ctl; |
1885 | int err, ctl_len, iov_size, total_len; |
1886 | |
1887 | err = -EFAULT; |
1888 | if (MSG_CMSG_COMPAT & flags) { |
1889 | if (get_compat_msghdr(msg_sys, msg_compat)) |
1890 | return -EFAULT; |
1891 | } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr))) |
1892 | return -EFAULT; |
1893 | |
1894 | /* do not move before msg_sys is valid */ |
1895 | err = -EMSGSIZE; |
1896 | if (msg_sys->msg_iovlen > UIO_MAXIOV) |
1897 | goto out; |
1898 | |
1899 | /* Check whether to allocate the iovec area */ |
1900 | err = -ENOMEM; |
1901 | iov_size = msg_sys->msg_iovlen * sizeof(struct iovec); |
1902 | if (msg_sys->msg_iovlen > UIO_FASTIOV) { |
1903 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
1904 | if (!iov) |
1905 | goto out; |
1906 | } |
1907 | |
1908 | /* This will also move the address data into kernel space */ |
1909 | if (MSG_CMSG_COMPAT & flags) { |
1910 | err = verify_compat_iovec(msg_sys, iov, |
1911 | (struct sockaddr *)&address, |
1912 | VERIFY_READ); |
1913 | } else |
1914 | err = verify_iovec(msg_sys, iov, |
1915 | (struct sockaddr *)&address, |
1916 | VERIFY_READ); |
1917 | if (err < 0) |
1918 | goto out_freeiov; |
1919 | total_len = err; |
1920 | |
1921 | err = -ENOBUFS; |
1922 | |
1923 | if (msg_sys->msg_controllen > INT_MAX) |
1924 | goto out_freeiov; |
1925 | ctl_len = msg_sys->msg_controllen; |
1926 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
1927 | err = |
1928 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
1929 | sizeof(ctl)); |
1930 | if (err) |
1931 | goto out_freeiov; |
1932 | ctl_buf = msg_sys->msg_control; |
1933 | ctl_len = msg_sys->msg_controllen; |
1934 | } else if (ctl_len) { |
1935 | if (ctl_len > sizeof(ctl)) { |
1936 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
1937 | if (ctl_buf == NULL) |
1938 | goto out_freeiov; |
1939 | } |
1940 | err = -EFAULT; |
1941 | /* |
1942 | * Careful! Before this, msg_sys->msg_control contains a user pointer. |
1943 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted |
1944 | * checking falls down on this. |
1945 | */ |
1946 | if (copy_from_user(ctl_buf, |
1947 | (void __user __force *)msg_sys->msg_control, |
1948 | ctl_len)) |
1949 | goto out_freectl; |
1950 | msg_sys->msg_control = ctl_buf; |
1951 | } |
1952 | msg_sys->msg_flags = flags; |
1953 | |
1954 | if (sock->file->f_flags & O_NONBLOCK) |
1955 | msg_sys->msg_flags |= MSG_DONTWAIT; |
1956 | err = (nosec ? sock_sendmsg_nosec : sock_sendmsg)(sock, msg_sys, |
1957 | total_len); |
1958 | |
1959 | out_freectl: |
1960 | if (ctl_buf != ctl) |
1961 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
1962 | out_freeiov: |
1963 | if (iov != iovstack) |
1964 | sock_kfree_s(sock->sk, iov, iov_size); |
1965 | out: |
1966 | return err; |
1967 | } |
1968 | |
1969 | /* |
1970 | * BSD sendmsg interface |
1971 | */ |
1972 | |
1973 | SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags) |
1974 | { |
1975 | int fput_needed, err; |
1976 | struct msghdr msg_sys; |
1977 | struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1978 | |
1979 | if (!sock) |
1980 | goto out; |
1981 | |
1982 | err = __sys_sendmsg(sock, msg, &msg_sys, flags, 0); |
1983 | |
1984 | fput_light(sock->file, fput_needed); |
1985 | out: |
1986 | return err; |
1987 | } |
1988 | |
1989 | /* |
1990 | * Linux sendmmsg interface |
1991 | */ |
1992 | |
1993 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, |
1994 | unsigned int flags) |
1995 | { |
1996 | int fput_needed, err, datagrams; |
1997 | struct socket *sock; |
1998 | struct mmsghdr __user *entry; |
1999 | struct compat_mmsghdr __user *compat_entry; |
2000 | struct msghdr msg_sys; |
2001 | |
2002 | datagrams = 0; |
2003 | |
2004 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2005 | if (!sock) |
2006 | return err; |
2007 | |
2008 | err = sock_error(sock->sk); |
2009 | if (err) |
2010 | goto out_put; |
2011 | |
2012 | entry = mmsg; |
2013 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
2014 | |
2015 | while (datagrams < vlen) { |
2016 | /* |
2017 | * No need to ask LSM for more than the first datagram. |
2018 | */ |
2019 | if (MSG_CMSG_COMPAT & flags) { |
2020 | err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry, |
2021 | &msg_sys, flags, datagrams); |
2022 | if (err < 0) |
2023 | break; |
2024 | err = __put_user(err, &compat_entry->msg_len); |
2025 | ++compat_entry; |
2026 | } else { |
2027 | err = __sys_sendmsg(sock, (struct msghdr __user *)entry, |
2028 | &msg_sys, flags, datagrams); |
2029 | if (err < 0) |
2030 | break; |
2031 | err = put_user(err, &entry->msg_len); |
2032 | ++entry; |
2033 | } |
2034 | |
2035 | if (err) |
2036 | break; |
2037 | ++datagrams; |
2038 | } |
2039 | |
2040 | out_put: |
2041 | fput_light(sock->file, fput_needed); |
2042 | |
2043 | if (err == 0) |
2044 | return datagrams; |
2045 | |
2046 | if (datagrams != 0) { |
2047 | /* |
2048 | * We may send less entries than requested (vlen) if the |
2049 | * sock is non blocking... |
2050 | */ |
2051 | if (err != -EAGAIN) { |
2052 | /* |
2053 | * ... or if sendmsg returns an error after we |
2054 | * send some datagrams, where we record the |
2055 | * error to return on the next call or if the |
2056 | * app asks about it using getsockopt(SO_ERROR). |
2057 | */ |
2058 | sock->sk->sk_err = -err; |
2059 | } |
2060 | |
2061 | return datagrams; |
2062 | } |
2063 | |
2064 | return err; |
2065 | } |
2066 | |
2067 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2068 | unsigned int, vlen, unsigned int, flags) |
2069 | { |
2070 | return __sys_sendmmsg(fd, mmsg, vlen, flags); |
2071 | } |
2072 | |
2073 | static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg, |
2074 | struct msghdr *msg_sys, unsigned flags, int nosec) |
2075 | { |
2076 | struct compat_msghdr __user *msg_compat = |
2077 | (struct compat_msghdr __user *)msg; |
2078 | struct iovec iovstack[UIO_FASTIOV]; |
2079 | struct iovec *iov = iovstack; |
2080 | unsigned long cmsg_ptr; |
2081 | int err, iov_size, total_len, len; |
2082 | |
2083 | /* kernel mode address */ |
2084 | struct sockaddr_storage addr; |
2085 | |
2086 | /* user mode address pointers */ |
2087 | struct sockaddr __user *uaddr; |
2088 | int __user *uaddr_len; |
2089 | |
2090 | if (MSG_CMSG_COMPAT & flags) { |
2091 | if (get_compat_msghdr(msg_sys, msg_compat)) |
2092 | return -EFAULT; |
2093 | } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr))) |
2094 | return -EFAULT; |
2095 | |
2096 | err = -EMSGSIZE; |
2097 | if (msg_sys->msg_iovlen > UIO_MAXIOV) |
2098 | goto out; |
2099 | |
2100 | /* Check whether to allocate the iovec area */ |
2101 | err = -ENOMEM; |
2102 | iov_size = msg_sys->msg_iovlen * sizeof(struct iovec); |
2103 | if (msg_sys->msg_iovlen > UIO_FASTIOV) { |
2104 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
2105 | if (!iov) |
2106 | goto out; |
2107 | } |
2108 | |
2109 | /* |
2110 | * Save the user-mode address (verify_iovec will change the |
2111 | * kernel msghdr to use the kernel address space) |
2112 | */ |
2113 | |
2114 | uaddr = (__force void __user *)msg_sys->msg_name; |
2115 | uaddr_len = COMPAT_NAMELEN(msg); |
2116 | if (MSG_CMSG_COMPAT & flags) { |
2117 | err = verify_compat_iovec(msg_sys, iov, |
2118 | (struct sockaddr *)&addr, |
2119 | VERIFY_WRITE); |
2120 | } else |
2121 | err = verify_iovec(msg_sys, iov, |
2122 | (struct sockaddr *)&addr, |
2123 | VERIFY_WRITE); |
2124 | if (err < 0) |
2125 | goto out_freeiov; |
2126 | total_len = err; |
2127 | |
2128 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
2129 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); |
2130 | |
2131 | if (sock->file->f_flags & O_NONBLOCK) |
2132 | flags |= MSG_DONTWAIT; |
2133 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, |
2134 | total_len, flags); |
2135 | if (err < 0) |
2136 | goto out_freeiov; |
2137 | len = err; |
2138 | |
2139 | if (uaddr != NULL) { |
2140 | err = move_addr_to_user((struct sockaddr *)&addr, |
2141 | msg_sys->msg_namelen, uaddr, |
2142 | uaddr_len); |
2143 | if (err < 0) |
2144 | goto out_freeiov; |
2145 | } |
2146 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
2147 | COMPAT_FLAGS(msg)); |
2148 | if (err) |
2149 | goto out_freeiov; |
2150 | if (MSG_CMSG_COMPAT & flags) |
2151 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
2152 | &msg_compat->msg_controllen); |
2153 | else |
2154 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
2155 | &msg->msg_controllen); |
2156 | if (err) |
2157 | goto out_freeiov; |
2158 | err = len; |
2159 | |
2160 | out_freeiov: |
2161 | if (iov != iovstack) |
2162 | sock_kfree_s(sock->sk, iov, iov_size); |
2163 | out: |
2164 | return err; |
2165 | } |
2166 | |
2167 | /* |
2168 | * BSD recvmsg interface |
2169 | */ |
2170 | |
2171 | SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg, |
2172 | unsigned int, flags) |
2173 | { |
2174 | int fput_needed, err; |
2175 | struct msghdr msg_sys; |
2176 | struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2177 | |
2178 | if (!sock) |
2179 | goto out; |
2180 | |
2181 | err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
2182 | |
2183 | fput_light(sock->file, fput_needed); |
2184 | out: |
2185 | return err; |
2186 | } |
2187 | |
2188 | /* |
2189 | * Linux recvmmsg interface |
2190 | */ |
2191 | |
2192 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, |
2193 | unsigned int flags, struct timespec *timeout) |
2194 | { |
2195 | int fput_needed, err, datagrams; |
2196 | struct socket *sock; |
2197 | struct mmsghdr __user *entry; |
2198 | struct compat_mmsghdr __user *compat_entry; |
2199 | struct msghdr msg_sys; |
2200 | struct timespec end_time; |
2201 | |
2202 | if (timeout && |
2203 | poll_select_set_timeout(&end_time, timeout->tv_sec, |
2204 | timeout->tv_nsec)) |
2205 | return -EINVAL; |
2206 | |
2207 | datagrams = 0; |
2208 | |
2209 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2210 | if (!sock) |
2211 | return err; |
2212 | |
2213 | err = sock_error(sock->sk); |
2214 | if (err) |
2215 | goto out_put; |
2216 | |
2217 | entry = mmsg; |
2218 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
2219 | |
2220 | while (datagrams < vlen) { |
2221 | /* |
2222 | * No need to ask LSM for more than the first datagram. |
2223 | */ |
2224 | if (MSG_CMSG_COMPAT & flags) { |
2225 | err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry, |
2226 | &msg_sys, flags & ~MSG_WAITFORONE, |
2227 | datagrams); |
2228 | if (err < 0) |
2229 | break; |
2230 | err = __put_user(err, &compat_entry->msg_len); |
2231 | ++compat_entry; |
2232 | } else { |
2233 | err = __sys_recvmsg(sock, (struct msghdr __user *)entry, |
2234 | &msg_sys, flags & ~MSG_WAITFORONE, |
2235 | datagrams); |
2236 | if (err < 0) |
2237 | break; |
2238 | err = put_user(err, &entry->msg_len); |
2239 | ++entry; |
2240 | } |
2241 | |
2242 | if (err) |
2243 | break; |
2244 | ++datagrams; |
2245 | |
2246 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
2247 | if (flags & MSG_WAITFORONE) |
2248 | flags |= MSG_DONTWAIT; |
2249 | |
2250 | if (timeout) { |
2251 | ktime_get_ts(timeout); |
2252 | *timeout = timespec_sub(end_time, *timeout); |
2253 | if (timeout->tv_sec < 0) { |
2254 | timeout->tv_sec = timeout->tv_nsec = 0; |
2255 | break; |
2256 | } |
2257 | |
2258 | /* Timeout, return less than vlen datagrams */ |
2259 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) |
2260 | break; |
2261 | } |
2262 | |
2263 | /* Out of band data, return right away */ |
2264 | if (msg_sys.msg_flags & MSG_OOB) |
2265 | break; |
2266 | } |
2267 | |
2268 | out_put: |
2269 | fput_light(sock->file, fput_needed); |
2270 | |
2271 | if (err == 0) |
2272 | return datagrams; |
2273 | |
2274 | if (datagrams != 0) { |
2275 | /* |
2276 | * We may return less entries than requested (vlen) if the |
2277 | * sock is non block and there aren't enough datagrams... |
2278 | */ |
2279 | if (err != -EAGAIN) { |
2280 | /* |
2281 | * ... or if recvmsg returns an error after we |
2282 | * received some datagrams, where we record the |
2283 | * error to return on the next call or if the |
2284 | * app asks about it using getsockopt(SO_ERROR). |
2285 | */ |
2286 | sock->sk->sk_err = -err; |
2287 | } |
2288 | |
2289 | return datagrams; |
2290 | } |
2291 | |
2292 | return err; |
2293 | } |
2294 | |
2295 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2296 | unsigned int, vlen, unsigned int, flags, |
2297 | struct timespec __user *, timeout) |
2298 | { |
2299 | int datagrams; |
2300 | struct timespec timeout_sys; |
2301 | |
2302 | if (!timeout) |
2303 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); |
2304 | |
2305 | if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) |
2306 | return -EFAULT; |
2307 | |
2308 | datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); |
2309 | |
2310 | if (datagrams > 0 && |
2311 | copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) |
2312 | datagrams = -EFAULT; |
2313 | |
2314 | return datagrams; |
2315 | } |
2316 | |
2317 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
2318 | /* Argument list sizes for sys_socketcall */ |
2319 | #define AL(x) ((x) * sizeof(unsigned long)) |
2320 | static const unsigned char nargs[21] = { |
2321 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
2322 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), |
2323 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), |
2324 | AL(4), AL(5), AL(4) |
2325 | }; |
2326 | |
2327 | #undef AL |
2328 | |
2329 | /* |
2330 | * System call vectors. |
2331 | * |
2332 | * Argument checking cleaned up. Saved 20% in size. |
2333 | * This function doesn't need to set the kernel lock because |
2334 | * it is set by the callees. |
2335 | */ |
2336 | |
2337 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
2338 | { |
2339 | unsigned long a[6]; |
2340 | unsigned long a0, a1; |
2341 | int err; |
2342 | unsigned int len; |
2343 | |
2344 | if (call < 1 || call > SYS_SENDMMSG) |
2345 | return -EINVAL; |
2346 | |
2347 | len = nargs[call]; |
2348 | if (len > sizeof(a)) |
2349 | return -EINVAL; |
2350 | |
2351 | /* copy_from_user should be SMP safe. */ |
2352 | if (copy_from_user(a, args, len)) |
2353 | return -EFAULT; |
2354 | |
2355 | audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
2356 | |
2357 | a0 = a[0]; |
2358 | a1 = a[1]; |
2359 | |
2360 | switch (call) { |
2361 | case SYS_SOCKET: |
2362 | err = sys_socket(a0, a1, a[2]); |
2363 | break; |
2364 | case SYS_BIND: |
2365 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
2366 | break; |
2367 | case SYS_CONNECT: |
2368 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
2369 | break; |
2370 | case SYS_LISTEN: |
2371 | err = sys_listen(a0, a1); |
2372 | break; |
2373 | case SYS_ACCEPT: |
2374 | err = sys_accept4(a0, (struct sockaddr __user *)a1, |
2375 | (int __user *)a[2], 0); |
2376 | break; |
2377 | case SYS_GETSOCKNAME: |
2378 | err = |
2379 | sys_getsockname(a0, (struct sockaddr __user *)a1, |
2380 | (int __user *)a[2]); |
2381 | break; |
2382 | case SYS_GETPEERNAME: |
2383 | err = |
2384 | sys_getpeername(a0, (struct sockaddr __user *)a1, |
2385 | (int __user *)a[2]); |
2386 | break; |
2387 | case SYS_SOCKETPAIR: |
2388 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
2389 | break; |
2390 | case SYS_SEND: |
2391 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); |
2392 | break; |
2393 | case SYS_SENDTO: |
2394 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2395 | (struct sockaddr __user *)a[4], a[5]); |
2396 | break; |
2397 | case SYS_RECV: |
2398 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); |
2399 | break; |
2400 | case SYS_RECVFROM: |
2401 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2402 | (struct sockaddr __user *)a[4], |
2403 | (int __user *)a[5]); |
2404 | break; |
2405 | case SYS_SHUTDOWN: |
2406 | err = sys_shutdown(a0, a1); |
2407 | break; |
2408 | case SYS_SETSOCKOPT: |
2409 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); |
2410 | break; |
2411 | case SYS_GETSOCKOPT: |
2412 | err = |
2413 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
2414 | (int __user *)a[4]); |
2415 | break; |
2416 | case SYS_SENDMSG: |
2417 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); |
2418 | break; |
2419 | case SYS_SENDMMSG: |
2420 | err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); |
2421 | break; |
2422 | case SYS_RECVMSG: |
2423 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); |
2424 | break; |
2425 | case SYS_RECVMMSG: |
2426 | err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], |
2427 | (struct timespec __user *)a[4]); |
2428 | break; |
2429 | case SYS_ACCEPT4: |
2430 | err = sys_accept4(a0, (struct sockaddr __user *)a1, |
2431 | (int __user *)a[2], a[3]); |
2432 | break; |
2433 | default: |
2434 | err = -EINVAL; |
2435 | break; |
2436 | } |
2437 | return err; |
2438 | } |
2439 | |
2440 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
2441 | |
2442 | /** |
2443 | * sock_register - add a socket protocol handler |
2444 | * @ops: description of protocol |
2445 | * |
2446 | * This function is called by a protocol handler that wants to |
2447 | * advertise its address family, and have it linked into the |
2448 | * socket interface. The value ops->family coresponds to the |
2449 | * socket system call protocol family. |
2450 | */ |
2451 | int sock_register(const struct net_proto_family *ops) |
2452 | { |
2453 | int err; |
2454 | |
2455 | if (ops->family >= NPROTO) { |
2456 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
2457 | NPROTO); |
2458 | return -ENOBUFS; |
2459 | } |
2460 | |
2461 | spin_lock(&net_family_lock); |
2462 | if (rcu_dereference_protected(net_families[ops->family], |
2463 | lockdep_is_held(&net_family_lock))) |
2464 | err = -EEXIST; |
2465 | else { |
2466 | rcu_assign_pointer(net_families[ops->family], ops); |
2467 | err = 0; |
2468 | } |
2469 | spin_unlock(&net_family_lock); |
2470 | |
2471 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
2472 | return err; |
2473 | } |
2474 | EXPORT_SYMBOL(sock_register); |
2475 | |
2476 | /** |
2477 | * sock_unregister - remove a protocol handler |
2478 | * @family: protocol family to remove |
2479 | * |
2480 | * This function is called by a protocol handler that wants to |
2481 | * remove its address family, and have it unlinked from the |
2482 | * new socket creation. |
2483 | * |
2484 | * If protocol handler is a module, then it can use module reference |
2485 | * counts to protect against new references. If protocol handler is not |
2486 | * a module then it needs to provide its own protection in |
2487 | * the ops->create routine. |
2488 | */ |
2489 | void sock_unregister(int family) |
2490 | { |
2491 | BUG_ON(family < 0 || family >= NPROTO); |
2492 | |
2493 | spin_lock(&net_family_lock); |
2494 | rcu_assign_pointer(net_families[family], NULL); |
2495 | spin_unlock(&net_family_lock); |
2496 | |
2497 | synchronize_rcu(); |
2498 | |
2499 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
2500 | } |
2501 | EXPORT_SYMBOL(sock_unregister); |
2502 | |
2503 | static int __init sock_init(void) |
2504 | { |
2505 | int err; |
2506 | |
2507 | /* |
2508 | * Initialize sock SLAB cache. |
2509 | */ |
2510 | |
2511 | sk_init(); |
2512 | |
2513 | /* |
2514 | * Initialize skbuff SLAB cache |
2515 | */ |
2516 | skb_init(); |
2517 | |
2518 | /* |
2519 | * Initialize the protocols module. |
2520 | */ |
2521 | |
2522 | init_inodecache(); |
2523 | |
2524 | err = register_filesystem(&sock_fs_type); |
2525 | if (err) |
2526 | goto out_fs; |
2527 | sock_mnt = kern_mount(&sock_fs_type); |
2528 | if (IS_ERR(sock_mnt)) { |
2529 | err = PTR_ERR(sock_mnt); |
2530 | goto out_mount; |
2531 | } |
2532 | |
2533 | /* The real protocol initialization is performed in later initcalls. |
2534 | */ |
2535 | |
2536 | #ifdef CONFIG_NETFILTER |
2537 | netfilter_init(); |
2538 | #endif |
2539 | |
2540 | #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING |
2541 | skb_timestamping_init(); |
2542 | #endif |
2543 | |
2544 | out: |
2545 | return err; |
2546 | |
2547 | out_mount: |
2548 | unregister_filesystem(&sock_fs_type); |
2549 | out_fs: |
2550 | goto out; |
2551 | } |
2552 | |
2553 | core_initcall(sock_init); /* early initcall */ |
2554 | |
2555 | #ifdef CONFIG_PROC_FS |
2556 | void socket_seq_show(struct seq_file *seq) |
2557 | { |
2558 | int cpu; |
2559 | int counter = 0; |
2560 | |
2561 | for_each_possible_cpu(cpu) |
2562 | counter += per_cpu(sockets_in_use, cpu); |
2563 | |
2564 | /* It can be negative, by the way. 8) */ |
2565 | if (counter < 0) |
2566 | counter = 0; |
2567 | |
2568 | seq_printf(seq, "sockets: used %d\n", counter); |
2569 | } |
2570 | #endif /* CONFIG_PROC_FS */ |
2571 | |
2572 | #ifdef CONFIG_COMPAT |
2573 | static int do_siocgstamp(struct net *net, struct socket *sock, |
2574 | unsigned int cmd, struct compat_timeval __user *up) |
2575 | { |
2576 | mm_segment_t old_fs = get_fs(); |
2577 | struct timeval ktv; |
2578 | int err; |
2579 | |
2580 | set_fs(KERNEL_DS); |
2581 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); |
2582 | set_fs(old_fs); |
2583 | if (!err) { |
2584 | err = put_user(ktv.tv_sec, &up->tv_sec); |
2585 | err |= __put_user(ktv.tv_usec, &up->tv_usec); |
2586 | } |
2587 | return err; |
2588 | } |
2589 | |
2590 | static int do_siocgstampns(struct net *net, struct socket *sock, |
2591 | unsigned int cmd, struct compat_timespec __user *up) |
2592 | { |
2593 | mm_segment_t old_fs = get_fs(); |
2594 | struct timespec kts; |
2595 | int err; |
2596 | |
2597 | set_fs(KERNEL_DS); |
2598 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); |
2599 | set_fs(old_fs); |
2600 | if (!err) { |
2601 | err = put_user(kts.tv_sec, &up->tv_sec); |
2602 | err |= __put_user(kts.tv_nsec, &up->tv_nsec); |
2603 | } |
2604 | return err; |
2605 | } |
2606 | |
2607 | static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) |
2608 | { |
2609 | struct ifreq __user *uifr; |
2610 | int err; |
2611 | |
2612 | uifr = compat_alloc_user_space(sizeof(struct ifreq)); |
2613 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) |
2614 | return -EFAULT; |
2615 | |
2616 | err = dev_ioctl(net, SIOCGIFNAME, uifr); |
2617 | if (err) |
2618 | return err; |
2619 | |
2620 | if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) |
2621 | return -EFAULT; |
2622 | |
2623 | return 0; |
2624 | } |
2625 | |
2626 | static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) |
2627 | { |
2628 | struct compat_ifconf ifc32; |
2629 | struct ifconf ifc; |
2630 | struct ifconf __user *uifc; |
2631 | struct compat_ifreq __user *ifr32; |
2632 | struct ifreq __user *ifr; |
2633 | unsigned int i, j; |
2634 | int err; |
2635 | |
2636 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) |
2637 | return -EFAULT; |
2638 | |
2639 | if (ifc32.ifcbuf == 0) { |
2640 | ifc32.ifc_len = 0; |
2641 | ifc.ifc_len = 0; |
2642 | ifc.ifc_req = NULL; |
2643 | uifc = compat_alloc_user_space(sizeof(struct ifconf)); |
2644 | } else { |
2645 | size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * |
2646 | sizeof(struct ifreq); |
2647 | uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); |
2648 | ifc.ifc_len = len; |
2649 | ifr = ifc.ifc_req = (void __user *)(uifc + 1); |
2650 | ifr32 = compat_ptr(ifc32.ifcbuf); |
2651 | for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { |
2652 | if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) |
2653 | return -EFAULT; |
2654 | ifr++; |
2655 | ifr32++; |
2656 | } |
2657 | } |
2658 | if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) |
2659 | return -EFAULT; |
2660 | |
2661 | err = dev_ioctl(net, SIOCGIFCONF, uifc); |
2662 | if (err) |
2663 | return err; |
2664 | |
2665 | if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) |
2666 | return -EFAULT; |
2667 | |
2668 | ifr = ifc.ifc_req; |
2669 | ifr32 = compat_ptr(ifc32.ifcbuf); |
2670 | for (i = 0, j = 0; |
2671 | i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; |
2672 | i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { |
2673 | if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) |
2674 | return -EFAULT; |
2675 | ifr32++; |
2676 | ifr++; |
2677 | } |
2678 | |
2679 | if (ifc32.ifcbuf == 0) { |
2680 | /* Translate from 64-bit structure multiple to |
2681 | * a 32-bit one. |
2682 | */ |
2683 | i = ifc.ifc_len; |
2684 | i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); |
2685 | ifc32.ifc_len = i; |
2686 | } else { |
2687 | ifc32.ifc_len = i; |
2688 | } |
2689 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) |
2690 | return -EFAULT; |
2691 | |
2692 | return 0; |
2693 | } |
2694 | |
2695 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) |
2696 | { |
2697 | struct compat_ethtool_rxnfc __user *compat_rxnfc; |
2698 | bool convert_in = false, convert_out = false; |
2699 | size_t buf_size = ALIGN(sizeof(struct ifreq), 8); |
2700 | struct ethtool_rxnfc __user *rxnfc; |
2701 | struct ifreq __user *ifr; |
2702 | u32 rule_cnt = 0, actual_rule_cnt; |
2703 | u32 ethcmd; |
2704 | u32 data; |
2705 | int ret; |
2706 | |
2707 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) |
2708 | return -EFAULT; |
2709 | |
2710 | compat_rxnfc = compat_ptr(data); |
2711 | |
2712 | if (get_user(ethcmd, &compat_rxnfc->cmd)) |
2713 | return -EFAULT; |
2714 | |
2715 | /* Most ethtool structures are defined without padding. |
2716 | * Unfortunately struct ethtool_rxnfc is an exception. |
2717 | */ |
2718 | switch (ethcmd) { |
2719 | default: |
2720 | break; |
2721 | case ETHTOOL_GRXCLSRLALL: |
2722 | /* Buffer size is variable */ |
2723 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) |
2724 | return -EFAULT; |
2725 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) |
2726 | return -ENOMEM; |
2727 | buf_size += rule_cnt * sizeof(u32); |
2728 | /* fall through */ |
2729 | case ETHTOOL_GRXRINGS: |
2730 | case ETHTOOL_GRXCLSRLCNT: |
2731 | case ETHTOOL_GRXCLSRULE: |
2732 | convert_out = true; |
2733 | /* fall through */ |
2734 | case ETHTOOL_SRXCLSRLDEL: |
2735 | case ETHTOOL_SRXCLSRLINS: |
2736 | buf_size += sizeof(struct ethtool_rxnfc); |
2737 | convert_in = true; |
2738 | break; |
2739 | } |
2740 | |
2741 | ifr = compat_alloc_user_space(buf_size); |
2742 | rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8); |
2743 | |
2744 | if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) |
2745 | return -EFAULT; |
2746 | |
2747 | if (put_user(convert_in ? rxnfc : compat_ptr(data), |
2748 | &ifr->ifr_ifru.ifru_data)) |
2749 | return -EFAULT; |
2750 | |
2751 | if (convert_in) { |
2752 | /* We expect there to be holes between fs.m_ext and |
2753 | * fs.ring_cookie and at the end of fs, but nowhere else. |
2754 | */ |
2755 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + |
2756 | sizeof(compat_rxnfc->fs.m_ext) != |
2757 | offsetof(struct ethtool_rxnfc, fs.m_ext) + |
2758 | sizeof(rxnfc->fs.m_ext)); |
2759 | BUILD_BUG_ON( |
2760 | offsetof(struct compat_ethtool_rxnfc, fs.location) - |
2761 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != |
2762 | offsetof(struct ethtool_rxnfc, fs.location) - |
2763 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); |
2764 | |
2765 | if (copy_in_user(rxnfc, compat_rxnfc, |
2766 | (void *)(&rxnfc->fs.m_ext + 1) - |
2767 | (void *)rxnfc) || |
2768 | copy_in_user(&rxnfc->fs.ring_cookie, |
2769 | &compat_rxnfc->fs.ring_cookie, |
2770 | (void *)(&rxnfc->fs.location + 1) - |
2771 | (void *)&rxnfc->fs.ring_cookie) || |
2772 | copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, |
2773 | sizeof(rxnfc->rule_cnt))) |
2774 | return -EFAULT; |
2775 | } |
2776 | |
2777 | ret = dev_ioctl(net, SIOCETHTOOL, ifr); |
2778 | if (ret) |
2779 | return ret; |
2780 | |
2781 | if (convert_out) { |
2782 | if (copy_in_user(compat_rxnfc, rxnfc, |
2783 | (const void *)(&rxnfc->fs.m_ext + 1) - |
2784 | (const void *)rxnfc) || |
2785 | copy_in_user(&compat_rxnfc->fs.ring_cookie, |
2786 | &rxnfc->fs.ring_cookie, |
2787 | (const void *)(&rxnfc->fs.location + 1) - |
2788 | (const void *)&rxnfc->fs.ring_cookie) || |
2789 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, |
2790 | sizeof(rxnfc->rule_cnt))) |
2791 | return -EFAULT; |
2792 | |
2793 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { |
2794 | /* As an optimisation, we only copy the actual |
2795 | * number of rules that the underlying |
2796 | * function returned. Since Mallory might |
2797 | * change the rule count in user memory, we |
2798 | * check that it is less than the rule count |
2799 | * originally given (as the user buffer size), |
2800 | * which has been range-checked. |
2801 | */ |
2802 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) |
2803 | return -EFAULT; |
2804 | if (actual_rule_cnt < rule_cnt) |
2805 | rule_cnt = actual_rule_cnt; |
2806 | if (copy_in_user(&compat_rxnfc->rule_locs[0], |
2807 | &rxnfc->rule_locs[0], |
2808 | rule_cnt * sizeof(u32))) |
2809 | return -EFAULT; |
2810 | } |
2811 | } |
2812 | |
2813 | return 0; |
2814 | } |
2815 | |
2816 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
2817 | { |
2818 | void __user *uptr; |
2819 | compat_uptr_t uptr32; |
2820 | struct ifreq __user *uifr; |
2821 | |
2822 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
2823 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) |
2824 | return -EFAULT; |
2825 | |
2826 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) |
2827 | return -EFAULT; |
2828 | |
2829 | uptr = compat_ptr(uptr32); |
2830 | |
2831 | if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) |
2832 | return -EFAULT; |
2833 | |
2834 | return dev_ioctl(net, SIOCWANDEV, uifr); |
2835 | } |
2836 | |
2837 | static int bond_ioctl(struct net *net, unsigned int cmd, |
2838 | struct compat_ifreq __user *ifr32) |
2839 | { |
2840 | struct ifreq kifr; |
2841 | struct ifreq __user *uifr; |
2842 | mm_segment_t old_fs; |
2843 | int err; |
2844 | u32 data; |
2845 | void __user *datap; |
2846 | |
2847 | switch (cmd) { |
2848 | case SIOCBONDENSLAVE: |
2849 | case SIOCBONDRELEASE: |
2850 | case SIOCBONDSETHWADDR: |
2851 | case SIOCBONDCHANGEACTIVE: |
2852 | if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) |
2853 | return -EFAULT; |
2854 | |
2855 | old_fs = get_fs(); |
2856 | set_fs(KERNEL_DS); |
2857 | err = dev_ioctl(net, cmd, |
2858 | (struct ifreq __user __force *) &kifr); |
2859 | set_fs(old_fs); |
2860 | |
2861 | return err; |
2862 | case SIOCBONDSLAVEINFOQUERY: |
2863 | case SIOCBONDINFOQUERY: |
2864 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
2865 | if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) |
2866 | return -EFAULT; |
2867 | |
2868 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) |
2869 | return -EFAULT; |
2870 | |
2871 | datap = compat_ptr(data); |
2872 | if (put_user(datap, &uifr->ifr_ifru.ifru_data)) |
2873 | return -EFAULT; |
2874 | |
2875 | return dev_ioctl(net, cmd, uifr); |
2876 | default: |
2877 | return -EINVAL; |
2878 | } |
2879 | } |
2880 | |
2881 | static int siocdevprivate_ioctl(struct net *net, unsigned int cmd, |
2882 | struct compat_ifreq __user *u_ifreq32) |
2883 | { |
2884 | struct ifreq __user *u_ifreq64; |
2885 | char tmp_buf[IFNAMSIZ]; |
2886 | void __user *data64; |
2887 | u32 data32; |
2888 | |
2889 | if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), |
2890 | IFNAMSIZ)) |
2891 | return -EFAULT; |
2892 | if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) |
2893 | return -EFAULT; |
2894 | data64 = compat_ptr(data32); |
2895 | |
2896 | u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); |
2897 | |
2898 | /* Don't check these user accesses, just let that get trapped |
2899 | * in the ioctl handler instead. |
2900 | */ |
2901 | if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], |
2902 | IFNAMSIZ)) |
2903 | return -EFAULT; |
2904 | if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) |
2905 | return -EFAULT; |
2906 | |
2907 | return dev_ioctl(net, cmd, u_ifreq64); |
2908 | } |
2909 | |
2910 | static int dev_ifsioc(struct net *net, struct socket *sock, |
2911 | unsigned int cmd, struct compat_ifreq __user *uifr32) |
2912 | { |
2913 | struct ifreq __user *uifr; |
2914 | int err; |
2915 | |
2916 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
2917 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) |
2918 | return -EFAULT; |
2919 | |
2920 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); |
2921 | |
2922 | if (!err) { |
2923 | switch (cmd) { |
2924 | case SIOCGIFFLAGS: |
2925 | case SIOCGIFMETRIC: |
2926 | case SIOCGIFMTU: |
2927 | case SIOCGIFMEM: |
2928 | case SIOCGIFHWADDR: |
2929 | case SIOCGIFINDEX: |
2930 | case SIOCGIFADDR: |
2931 | case SIOCGIFBRDADDR: |
2932 | case SIOCGIFDSTADDR: |
2933 | case SIOCGIFNETMASK: |
2934 | case SIOCGIFPFLAGS: |
2935 | case SIOCGIFTXQLEN: |
2936 | case SIOCGMIIPHY: |
2937 | case SIOCGMIIREG: |
2938 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) |
2939 | err = -EFAULT; |
2940 | break; |
2941 | } |
2942 | } |
2943 | return err; |
2944 | } |
2945 | |
2946 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, |
2947 | struct compat_ifreq __user *uifr32) |
2948 | { |
2949 | struct ifreq ifr; |
2950 | struct compat_ifmap __user *uifmap32; |
2951 | mm_segment_t old_fs; |
2952 | int err; |
2953 | |
2954 | uifmap32 = &uifr32->ifr_ifru.ifru_map; |
2955 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); |
2956 | err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
2957 | err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); |
2958 | err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); |
2959 | err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq); |
2960 | err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma); |
2961 | err |= __get_user(ifr.ifr_map.port, &uifmap32->port); |
2962 | if (err) |
2963 | return -EFAULT; |
2964 | |
2965 | old_fs = get_fs(); |
2966 | set_fs(KERNEL_DS); |
2967 | err = dev_ioctl(net, cmd, (void __user __force *)&ifr); |
2968 | set_fs(old_fs); |
2969 | |
2970 | if (cmd == SIOCGIFMAP && !err) { |
2971 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); |
2972 | err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
2973 | err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); |
2974 | err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); |
2975 | err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq); |
2976 | err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma); |
2977 | err |= __put_user(ifr.ifr_map.port, &uifmap32->port); |
2978 | if (err) |
2979 | err = -EFAULT; |
2980 | } |
2981 | return err; |
2982 | } |
2983 | |
2984 | static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32) |
2985 | { |
2986 | void __user *uptr; |
2987 | compat_uptr_t uptr32; |
2988 | struct ifreq __user *uifr; |
2989 | |
2990 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
2991 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) |
2992 | return -EFAULT; |
2993 | |
2994 | if (get_user(uptr32, &uifr32->ifr_data)) |
2995 | return -EFAULT; |
2996 | |
2997 | uptr = compat_ptr(uptr32); |
2998 | |
2999 | if (put_user(uptr, &uifr->ifr_data)) |
3000 | return -EFAULT; |
3001 | |
3002 | return dev_ioctl(net, SIOCSHWTSTAMP, uifr); |
3003 | } |
3004 | |
3005 | struct rtentry32 { |
3006 | u32 rt_pad1; |
3007 | struct sockaddr rt_dst; /* target address */ |
3008 | struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ |
3009 | struct sockaddr rt_genmask; /* target network mask (IP) */ |
3010 | unsigned short rt_flags; |
3011 | short rt_pad2; |
3012 | u32 rt_pad3; |
3013 | unsigned char rt_tos; |
3014 | unsigned char rt_class; |
3015 | short rt_pad4; |
3016 | short rt_metric; /* +1 for binary compatibility! */ |
3017 | /* char * */ u32 rt_dev; /* forcing the device at add */ |
3018 | u32 rt_mtu; /* per route MTU/Window */ |
3019 | u32 rt_window; /* Window clamping */ |
3020 | unsigned short rt_irtt; /* Initial RTT */ |
3021 | }; |
3022 | |
3023 | struct in6_rtmsg32 { |
3024 | struct in6_addr rtmsg_dst; |
3025 | struct in6_addr rtmsg_src; |
3026 | struct in6_addr rtmsg_gateway; |
3027 | u32 rtmsg_type; |
3028 | u16 rtmsg_dst_len; |
3029 | u16 rtmsg_src_len; |
3030 | u32 rtmsg_metric; |
3031 | u32 rtmsg_info; |
3032 | u32 rtmsg_flags; |
3033 | s32 rtmsg_ifindex; |
3034 | }; |
3035 | |
3036 | static int routing_ioctl(struct net *net, struct socket *sock, |
3037 | unsigned int cmd, void __user *argp) |
3038 | { |
3039 | int ret; |
3040 | void *r = NULL; |
3041 | struct in6_rtmsg r6; |
3042 | struct rtentry r4; |
3043 | char devname[16]; |
3044 | u32 rtdev; |
3045 | mm_segment_t old_fs = get_fs(); |
3046 | |
3047 | if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ |
3048 | struct in6_rtmsg32 __user *ur6 = argp; |
3049 | ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), |
3050 | 3 * sizeof(struct in6_addr)); |
3051 | ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); |
3052 | ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); |
3053 | ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); |
3054 | ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); |
3055 | ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); |
3056 | ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); |
3057 | ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); |
3058 | |
3059 | r = (void *) &r6; |
3060 | } else { /* ipv4 */ |
3061 | struct rtentry32 __user *ur4 = argp; |
3062 | ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), |
3063 | 3 * sizeof(struct sockaddr)); |
3064 | ret |= __get_user(r4.rt_flags, &(ur4->rt_flags)); |
3065 | ret |= __get_user(r4.rt_metric, &(ur4->rt_metric)); |
3066 | ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu)); |
3067 | ret |= __get_user(r4.rt_window, &(ur4->rt_window)); |
3068 | ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt)); |
3069 | ret |= __get_user(rtdev, &(ur4->rt_dev)); |
3070 | if (rtdev) { |
3071 | ret |= copy_from_user(devname, compat_ptr(rtdev), 15); |
3072 | r4.rt_dev = (char __user __force *)devname; |
3073 | devname[15] = 0; |
3074 | } else |
3075 | r4.rt_dev = NULL; |
3076 | |
3077 | r = (void *) &r4; |
3078 | } |
3079 | |
3080 | if (ret) { |
3081 | ret = -EFAULT; |
3082 | goto out; |
3083 | } |
3084 | |
3085 | set_fs(KERNEL_DS); |
3086 | ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); |
3087 | set_fs(old_fs); |
3088 | |
3089 | out: |
3090 | return ret; |
3091 | } |
3092 | |
3093 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE |
3094 | * for some operations; this forces use of the newer bridge-utils that |
3095 | * use compatible ioctls |
3096 | */ |
3097 | static int old_bridge_ioctl(compat_ulong_t __user *argp) |
3098 | { |
3099 | compat_ulong_t tmp; |
3100 | |
3101 | if (get_user(tmp, argp)) |
3102 | return -EFAULT; |
3103 | if (tmp == BRCTL_GET_VERSION) |
3104 | return BRCTL_VERSION + 1; |
3105 | return -EINVAL; |
3106 | } |
3107 | |
3108 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
3109 | unsigned int cmd, unsigned long arg) |
3110 | { |
3111 | void __user *argp = compat_ptr(arg); |
3112 | struct sock *sk = sock->sk; |
3113 | struct net *net = sock_net(sk); |
3114 | |
3115 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
3116 | return siocdevprivate_ioctl(net, cmd, argp); |
3117 | |
3118 | switch (cmd) { |
3119 | case SIOCSIFBR: |
3120 | case SIOCGIFBR: |
3121 | return old_bridge_ioctl(argp); |
3122 | case SIOCGIFNAME: |
3123 | return dev_ifname32(net, argp); |
3124 | case SIOCGIFCONF: |
3125 | return dev_ifconf(net, argp); |
3126 | case SIOCETHTOOL: |
3127 | return ethtool_ioctl(net, argp); |
3128 | case SIOCWANDEV: |
3129 | return compat_siocwandev(net, argp); |
3130 | case SIOCGIFMAP: |
3131 | case SIOCSIFMAP: |
3132 | return compat_sioc_ifmap(net, cmd, argp); |
3133 | case SIOCBONDENSLAVE: |
3134 | case SIOCBONDRELEASE: |
3135 | case SIOCBONDSETHWADDR: |
3136 | case SIOCBONDSLAVEINFOQUERY: |
3137 | case SIOCBONDINFOQUERY: |
3138 | case SIOCBONDCHANGEACTIVE: |
3139 | return bond_ioctl(net, cmd, argp); |
3140 | case SIOCADDRT: |
3141 | case SIOCDELRT: |
3142 | return routing_ioctl(net, sock, cmd, argp); |
3143 | case SIOCGSTAMP: |
3144 | return do_siocgstamp(net, sock, cmd, argp); |
3145 | case SIOCGSTAMPNS: |
3146 | return do_siocgstampns(net, sock, cmd, argp); |
3147 | case SIOCSHWTSTAMP: |
3148 | return compat_siocshwtstamp(net, argp); |
3149 | |
3150 | case FIOSETOWN: |
3151 | case SIOCSPGRP: |
3152 | case FIOGETOWN: |
3153 | case SIOCGPGRP: |
3154 | case SIOCBRADDBR: |
3155 | case SIOCBRDELBR: |
3156 | case SIOCGIFVLAN: |
3157 | case SIOCSIFVLAN: |
3158 | case SIOCADDDLCI: |
3159 | case SIOCDELDLCI: |
3160 | return sock_ioctl(file, cmd, arg); |
3161 | |
3162 | case SIOCGIFFLAGS: |
3163 | case SIOCSIFFLAGS: |
3164 | case SIOCGIFMETRIC: |
3165 | case SIOCSIFMETRIC: |
3166 | case SIOCGIFMTU: |
3167 | case SIOCSIFMTU: |
3168 | case SIOCGIFMEM: |
3169 | case SIOCSIFMEM: |
3170 | case SIOCGIFHWADDR: |
3171 | case SIOCSIFHWADDR: |
3172 | case SIOCADDMULTI: |
3173 | case SIOCDELMULTI: |
3174 | case SIOCGIFINDEX: |
3175 | case SIOCGIFADDR: |
3176 | case SIOCSIFADDR: |
3177 | case SIOCSIFHWBROADCAST: |
3178 | case SIOCDIFADDR: |
3179 | case SIOCGIFBRDADDR: |
3180 | case SIOCSIFBRDADDR: |
3181 | case SIOCGIFDSTADDR: |
3182 | case SIOCSIFDSTADDR: |
3183 | case SIOCGIFNETMASK: |
3184 | case SIOCSIFNETMASK: |
3185 | case SIOCSIFPFLAGS: |
3186 | case SIOCGIFPFLAGS: |
3187 | case SIOCGIFTXQLEN: |
3188 | case SIOCSIFTXQLEN: |
3189 | case SIOCBRADDIF: |
3190 | case SIOCBRDELIF: |
3191 | case SIOCSIFNAME: |
3192 | case SIOCGMIIPHY: |
3193 | case SIOCGMIIREG: |
3194 | case SIOCSMIIREG: |
3195 | return dev_ifsioc(net, sock, cmd, argp); |
3196 | |
3197 | case SIOCSARP: |
3198 | case SIOCGARP: |
3199 | case SIOCDARP: |
3200 | case SIOCATMARK: |
3201 | return sock_do_ioctl(net, sock, cmd, arg); |
3202 | } |
3203 | |
3204 | /* Prevent warning from compat_sys_ioctl, these always |
3205 | * result in -EINVAL in the native case anyway. */ |
3206 | switch (cmd) { |
3207 | case SIOCRTMSG: |
3208 | case SIOCGIFCOUNT: |
3209 | case SIOCSRARP: |
3210 | case SIOCGRARP: |
3211 | case SIOCDRARP: |
3212 | case SIOCSIFLINK: |
3213 | case SIOCGIFSLAVE: |
3214 | case SIOCSIFSLAVE: |
3215 | return -EINVAL; |
3216 | } |
3217 | |
3218 | return -ENOIOCTLCMD; |
3219 | } |
3220 | |
3221 | static long compat_sock_ioctl(struct file *file, unsigned cmd, |
3222 | unsigned long arg) |
3223 | { |
3224 | struct socket *sock = file->private_data; |
3225 | int ret = -ENOIOCTLCMD; |
3226 | struct sock *sk; |
3227 | struct net *net; |
3228 | |
3229 | sk = sock->sk; |
3230 | net = sock_net(sk); |
3231 | |
3232 | if (sock->ops->compat_ioctl) |
3233 | ret = sock->ops->compat_ioctl(sock, cmd, arg); |
3234 | |
3235 | if (ret == -ENOIOCTLCMD && |
3236 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) |
3237 | ret = compat_wext_handle_ioctl(net, cmd, arg); |
3238 | |
3239 | if (ret == -ENOIOCTLCMD) |
3240 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); |
3241 | |
3242 | return ret; |
3243 | } |
3244 | #endif |
3245 | |
3246 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
3247 | { |
3248 | return sock->ops->bind(sock, addr, addrlen); |
3249 | } |
3250 | EXPORT_SYMBOL(kernel_bind); |
3251 | |
3252 | int kernel_listen(struct socket *sock, int backlog) |
3253 | { |
3254 | return sock->ops->listen(sock, backlog); |
3255 | } |
3256 | EXPORT_SYMBOL(kernel_listen); |
3257 | |
3258 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
3259 | { |
3260 | struct sock *sk = sock->sk; |
3261 | int err; |
3262 | |
3263 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, |
3264 | newsock); |
3265 | if (err < 0) |
3266 | goto done; |
3267 | |
3268 | err = sock->ops->accept(sock, *newsock, flags); |
3269 | if (err < 0) { |
3270 | sock_release(*newsock); |
3271 | *newsock = NULL; |
3272 | goto done; |
3273 | } |
3274 | |
3275 | (*newsock)->ops = sock->ops; |
3276 | __module_get((*newsock)->ops->owner); |
3277 | |
3278 | done: |
3279 | return err; |
3280 | } |
3281 | EXPORT_SYMBOL(kernel_accept); |
3282 | |
3283 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
3284 | int flags) |
3285 | { |
3286 | return sock->ops->connect(sock, addr, addrlen, flags); |
3287 | } |
3288 | EXPORT_SYMBOL(kernel_connect); |
3289 | |
3290 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, |
3291 | int *addrlen) |
3292 | { |
3293 | return sock->ops->getname(sock, addr, addrlen, 0); |
3294 | } |
3295 | EXPORT_SYMBOL(kernel_getsockname); |
3296 | |
3297 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, |
3298 | int *addrlen) |
3299 | { |
3300 | return sock->ops->getname(sock, addr, addrlen, 1); |
3301 | } |
3302 | EXPORT_SYMBOL(kernel_getpeername); |
3303 | |
3304 | int kernel_getsockopt(struct socket *sock, int level, int optname, |
3305 | char *optval, int *optlen) |
3306 | { |
3307 | mm_segment_t oldfs = get_fs(); |
3308 | char __user *uoptval; |
3309 | int __user *uoptlen; |
3310 | int err; |
3311 | |
3312 | uoptval = (char __user __force *) optval; |
3313 | uoptlen = (int __user __force *) optlen; |
3314 | |
3315 | set_fs(KERNEL_DS); |
3316 | if (level == SOL_SOCKET) |
3317 | err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); |
3318 | else |
3319 | err = sock->ops->getsockopt(sock, level, optname, uoptval, |
3320 | uoptlen); |
3321 | set_fs(oldfs); |
3322 | return err; |
3323 | } |
3324 | EXPORT_SYMBOL(kernel_getsockopt); |
3325 | |
3326 | int kernel_setsockopt(struct socket *sock, int level, int optname, |
3327 | char *optval, unsigned int optlen) |
3328 | { |
3329 | mm_segment_t oldfs = get_fs(); |
3330 | char __user *uoptval; |
3331 | int err; |
3332 | |
3333 | uoptval = (char __user __force *) optval; |
3334 | |
3335 | set_fs(KERNEL_DS); |
3336 | if (level == SOL_SOCKET) |
3337 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); |
3338 | else |
3339 | err = sock->ops->setsockopt(sock, level, optname, uoptval, |
3340 | optlen); |
3341 | set_fs(oldfs); |
3342 | return err; |
3343 | } |
3344 | EXPORT_SYMBOL(kernel_setsockopt); |
3345 | |
3346 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
3347 | size_t size, int flags) |
3348 | { |
3349 | sock_update_classid(sock->sk); |
3350 | |
3351 | if (sock->ops->sendpage) |
3352 | return sock->ops->sendpage(sock, page, offset, size, flags); |
3353 | |
3354 | return sock_no_sendpage(sock, page, offset, size, flags); |
3355 | } |
3356 | EXPORT_SYMBOL(kernel_sendpage); |
3357 | |
3358 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) |
3359 | { |
3360 | mm_segment_t oldfs = get_fs(); |
3361 | int err; |
3362 | |
3363 | set_fs(KERNEL_DS); |
3364 | err = sock->ops->ioctl(sock, cmd, arg); |
3365 | set_fs(oldfs); |
3366 | |
3367 | return err; |
3368 | } |
3369 | EXPORT_SYMBOL(kernel_sock_ioctl); |
3370 | |
3371 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
3372 | { |
3373 | return sock->ops->shutdown(sock, how); |
3374 | } |
3375 | EXPORT_SYMBOL(kernel_sock_shutdown); |
3376 |
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