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1 | /* | |
2 | * NET An implementation of the SOCKET network access protocol. | |
3 | * | |
4 | * Version: @(#)socket.c 1.1.93 18/02/95 | |
5 | * | |
6 | * Authors: Orest Zborowski, <obz@Kodak.COM> | |
7 | * Ross Biro | |
8 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> | |
9 | * | |
10 | * Fixes: | |
11 | * Anonymous : NOTSOCK/BADF cleanup. Error fix in | |
12 | * shutdown() | |
13 | * Alan Cox : verify_area() fixes | |
14 | * Alan Cox : Removed DDI | |
15 | * Jonathan Kamens : SOCK_DGRAM reconnect bug | |
16 | * Alan Cox : Moved a load of checks to the very | |
17 | * top level. | |
18 | * Alan Cox : Move address structures to/from user | |
19 | * mode above the protocol layers. | |
20 | * Rob Janssen : Allow 0 length sends. | |
21 | * Alan Cox : Asynchronous I/O support (cribbed from the | |
22 | * tty drivers). | |
23 | * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) | |
24 | * Jeff Uphoff : Made max number of sockets command-line | |
25 | * configurable. | |
26 | * Matti Aarnio : Made the number of sockets dynamic, | |
27 | * to be allocated when needed, and mr. | |
28 | * Uphoff's max is used as max to be | |
29 | * allowed to allocate. | |
30 | * Linus : Argh. removed all the socket allocation | |
31 | * altogether: it's in the inode now. | |
32 | * Alan Cox : Made sock_alloc()/sock_release() public | |
33 | * for NetROM and future kernel nfsd type | |
34 | * stuff. | |
35 | * Alan Cox : sendmsg/recvmsg basics. | |
36 | * Tom Dyas : Export net symbols. | |
37 | * Marcin Dalecki : Fixed problems with CONFIG_NET="n". | |
38 | * Alan Cox : Added thread locking to sys_* calls | |
39 | * for sockets. May have errors at the | |
40 | * moment. | |
41 | * Kevin Buhr : Fixed the dumb errors in the above. | |
42 | * Andi Kleen : Some small cleanups, optimizations, | |
43 | * and fixed a copy_from_user() bug. | |
44 | * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) | |
45 | * Tigran Aivazian : Made listen(2) backlog sanity checks | |
46 | * protocol-independent | |
47 | * | |
48 | * | |
49 | * This program is free software; you can redistribute it and/or | |
50 | * modify it under the terms of the GNU General Public License | |
51 | * as published by the Free Software Foundation; either version | |
52 | * 2 of the License, or (at your option) any later version. | |
53 | * | |
54 | * | |
55 | * This module is effectively the top level interface to the BSD socket | |
56 | * paradigm. | |
57 | * | |
58 | * Based upon Swansea University Computer Society NET3.039 | |
59 | */ | |
60 | ||
61 | #include <linux/mm.h> | |
62 | #include <linux/socket.h> | |
63 | #include <linux/file.h> | |
64 | #include <linux/net.h> | |
65 | #include <linux/interrupt.h> | |
66 | #include <linux/thread_info.h> | |
67 | #include <linux/rcupdate.h> | |
68 | #include <linux/netdevice.h> | |
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
71 | #include <linux/mutex.h> | |
72 | #include <linux/if_bridge.h> | |
73 | #include <linux/if_frad.h> | |
74 | #include <linux/if_vlan.h> | |
75 | #include <linux/ptp_classify.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 | #include <linux/xattr.h> | |
92 | ||
93 | #include <asm/uaccess.h> | |
94 | #include <asm/unistd.h> | |
95 | ||
96 | #include <net/compat.h> | |
97 | #include <net/wext.h> | |
98 | #include <net/cls_cgroup.h> | |
99 | ||
100 | #include <net/sock.h> | |
101 | #include <linux/netfilter.h> | |
102 | ||
103 | #include <linux/if_tun.h> | |
104 | #include <linux/ipv6_route.h> | |
105 | #include <linux/route.h> | |
106 | #include <linux/sockios.h> | |
107 | #include <linux/atalk.h> | |
108 | #include <net/busy_poll.h> | |
109 | #include <linux/errqueue.h> | |
110 | ||
111 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
112 | unsigned int sysctl_net_busy_read __read_mostly; | |
113 | unsigned int sysctl_net_busy_poll __read_mostly; | |
114 | #endif | |
115 | ||
116 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); | |
117 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); | |
118 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); | |
119 | ||
120 | static int sock_close(struct inode *inode, struct file *file); | |
121 | static unsigned int sock_poll(struct file *file, | |
122 | struct poll_table_struct *wait); | |
123 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); | |
124 | #ifdef CONFIG_COMPAT | |
125 | static long compat_sock_ioctl(struct file *file, | |
126 | unsigned int cmd, unsigned long arg); | |
127 | #endif | |
128 | static int sock_fasync(int fd, struct file *filp, int on); | |
129 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
130 | int offset, size_t size, loff_t *ppos, int more); | |
131 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, | |
132 | struct pipe_inode_info *pipe, size_t len, | |
133 | unsigned int flags); | |
134 | ||
135 | /* | |
136 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
137 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
138 | */ | |
139 | ||
140 | static const struct file_operations socket_file_ops = { | |
141 | .owner = THIS_MODULE, | |
142 | .llseek = no_llseek, | |
143 | .read = new_sync_read, | |
144 | .write = new_sync_write, | |
145 | .read_iter = sock_read_iter, | |
146 | .write_iter = sock_write_iter, | |
147 | .poll = sock_poll, | |
148 | .unlocked_ioctl = sock_ioctl, | |
149 | #ifdef CONFIG_COMPAT | |
150 | .compat_ioctl = compat_sock_ioctl, | |
151 | #endif | |
152 | .mmap = sock_mmap, | |
153 | .release = sock_close, | |
154 | .fasync = sock_fasync, | |
155 | .sendpage = sock_sendpage, | |
156 | .splice_write = generic_splice_sendpage, | |
157 | .splice_read = sock_splice_read, | |
158 | }; | |
159 | ||
160 | /* | |
161 | * The protocol list. Each protocol is registered in here. | |
162 | */ | |
163 | ||
164 | static DEFINE_SPINLOCK(net_family_lock); | |
165 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; | |
166 | ||
167 | /* | |
168 | * Statistics counters of the socket lists | |
169 | */ | |
170 | ||
171 | static DEFINE_PER_CPU(int, sockets_in_use); | |
172 | ||
173 | /* | |
174 | * Support routines. | |
175 | * Move socket addresses back and forth across the kernel/user | |
176 | * divide and look after the messy bits. | |
177 | */ | |
178 | ||
179 | /** | |
180 | * move_addr_to_kernel - copy a socket address into kernel space | |
181 | * @uaddr: Address in user space | |
182 | * @kaddr: Address in kernel space | |
183 | * @ulen: Length in user space | |
184 | * | |
185 | * The address is copied into kernel space. If the provided address is | |
186 | * too long an error code of -EINVAL is returned. If the copy gives | |
187 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
188 | */ | |
189 | ||
190 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) | |
191 | { | |
192 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) | |
193 | return -EINVAL; | |
194 | if (ulen == 0) | |
195 | return 0; | |
196 | if (copy_from_user(kaddr, uaddr, ulen)) | |
197 | return -EFAULT; | |
198 | return audit_sockaddr(ulen, kaddr); | |
199 | } | |
200 | ||
201 | /** | |
202 | * move_addr_to_user - copy an address to user space | |
203 | * @kaddr: kernel space address | |
204 | * @klen: length of address in kernel | |
205 | * @uaddr: user space address | |
206 | * @ulen: pointer to user length field | |
207 | * | |
208 | * The value pointed to by ulen on entry is the buffer length available. | |
209 | * This is overwritten with the buffer space used. -EINVAL is returned | |
210 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
211 | * is returned if either the buffer or the length field are not | |
212 | * accessible. | |
213 | * After copying the data up to the limit the user specifies, the true | |
214 | * length of the data is written over the length limit the user | |
215 | * specified. Zero is returned for a success. | |
216 | */ | |
217 | ||
218 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, | |
219 | void __user *uaddr, int __user *ulen) | |
220 | { | |
221 | int err; | |
222 | int len; | |
223 | ||
224 | BUG_ON(klen > sizeof(struct sockaddr_storage)); | |
225 | err = get_user(len, ulen); | |
226 | if (err) | |
227 | return err; | |
228 | if (len > klen) | |
229 | len = klen; | |
230 | if (len < 0) | |
231 | return -EINVAL; | |
232 | if (len) { | |
233 | if (audit_sockaddr(klen, kaddr)) | |
234 | return -ENOMEM; | |
235 | if (copy_to_user(uaddr, kaddr, len)) | |
236 | return -EFAULT; | |
237 | } | |
238 | /* | |
239 | * "fromlen shall refer to the value before truncation.." | |
240 | * 1003.1g | |
241 | */ | |
242 | return __put_user(klen, ulen); | |
243 | } | |
244 | ||
245 | static struct kmem_cache *sock_inode_cachep __read_mostly; | |
246 | ||
247 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
248 | { | |
249 | struct socket_alloc *ei; | |
250 | struct socket_wq *wq; | |
251 | ||
252 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); | |
253 | if (!ei) | |
254 | return NULL; | |
255 | wq = kmalloc(sizeof(*wq), GFP_KERNEL); | |
256 | if (!wq) { | |
257 | kmem_cache_free(sock_inode_cachep, ei); | |
258 | return NULL; | |
259 | } | |
260 | init_waitqueue_head(&wq->wait); | |
261 | wq->fasync_list = NULL; | |
262 | RCU_INIT_POINTER(ei->socket.wq, wq); | |
263 | ||
264 | ei->socket.state = SS_UNCONNECTED; | |
265 | ei->socket.flags = 0; | |
266 | ei->socket.ops = NULL; | |
267 | ei->socket.sk = NULL; | |
268 | ei->socket.file = NULL; | |
269 | ||
270 | return &ei->vfs_inode; | |
271 | } | |
272 | ||
273 | static void sock_destroy_inode(struct inode *inode) | |
274 | { | |
275 | struct socket_alloc *ei; | |
276 | struct socket_wq *wq; | |
277 | ||
278 | ei = container_of(inode, struct socket_alloc, vfs_inode); | |
279 | wq = rcu_dereference_protected(ei->socket.wq, 1); | |
280 | kfree_rcu(wq, rcu); | |
281 | kmem_cache_free(sock_inode_cachep, ei); | |
282 | } | |
283 | ||
284 | static void init_once(void *foo) | |
285 | { | |
286 | struct socket_alloc *ei = (struct socket_alloc *)foo; | |
287 | ||
288 | inode_init_once(&ei->vfs_inode); | |
289 | } | |
290 | ||
291 | static int init_inodecache(void) | |
292 | { | |
293 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
294 | sizeof(struct socket_alloc), | |
295 | 0, | |
296 | (SLAB_HWCACHE_ALIGN | | |
297 | SLAB_RECLAIM_ACCOUNT | | |
298 | SLAB_MEM_SPREAD), | |
299 | init_once); | |
300 | if (sock_inode_cachep == NULL) | |
301 | return -ENOMEM; | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static const struct super_operations sockfs_ops = { | |
306 | .alloc_inode = sock_alloc_inode, | |
307 | .destroy_inode = sock_destroy_inode, | |
308 | .statfs = simple_statfs, | |
309 | }; | |
310 | ||
311 | /* | |
312 | * sockfs_dname() is called from d_path(). | |
313 | */ | |
314 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
315 | { | |
316 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
317 | dentry->d_inode->i_ino); | |
318 | } | |
319 | ||
320 | static const struct dentry_operations sockfs_dentry_operations = { | |
321 | .d_dname = sockfs_dname, | |
322 | }; | |
323 | ||
324 | static struct dentry *sockfs_mount(struct file_system_type *fs_type, | |
325 | int flags, const char *dev_name, void *data) | |
326 | { | |
327 | return mount_pseudo(fs_type, "socket:", &sockfs_ops, | |
328 | &sockfs_dentry_operations, SOCKFS_MAGIC); | |
329 | } | |
330 | ||
331 | static struct vfsmount *sock_mnt __read_mostly; | |
332 | ||
333 | static struct file_system_type sock_fs_type = { | |
334 | .name = "sockfs", | |
335 | .mount = sockfs_mount, | |
336 | .kill_sb = kill_anon_super, | |
337 | }; | |
338 | ||
339 | /* | |
340 | * Obtains the first available file descriptor and sets it up for use. | |
341 | * | |
342 | * These functions create file structures and maps them to fd space | |
343 | * of the current process. On success it returns file descriptor | |
344 | * and file struct implicitly stored in sock->file. | |
345 | * Note that another thread may close file descriptor before we return | |
346 | * from this function. We use the fact that now we do not refer | |
347 | * to socket after mapping. If one day we will need it, this | |
348 | * function will increment ref. count on file by 1. | |
349 | * | |
350 | * In any case returned fd MAY BE not valid! | |
351 | * This race condition is unavoidable | |
352 | * with shared fd spaces, we cannot solve it inside kernel, | |
353 | * but we take care of internal coherence yet. | |
354 | */ | |
355 | ||
356 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) | |
357 | { | |
358 | struct qstr name = { .name = "" }; | |
359 | struct path path; | |
360 | struct file *file; | |
361 | ||
362 | if (dname) { | |
363 | name.name = dname; | |
364 | name.len = strlen(name.name); | |
365 | } else if (sock->sk) { | |
366 | name.name = sock->sk->sk_prot_creator->name; | |
367 | name.len = strlen(name.name); | |
368 | } | |
369 | path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); | |
370 | if (unlikely(!path.dentry)) | |
371 | return ERR_PTR(-ENOMEM); | |
372 | path.mnt = mntget(sock_mnt); | |
373 | ||
374 | d_instantiate(path.dentry, SOCK_INODE(sock)); | |
375 | ||
376 | file = alloc_file(&path, FMODE_READ | FMODE_WRITE, | |
377 | &socket_file_ops); | |
378 | if (unlikely(IS_ERR(file))) { | |
379 | /* drop dentry, keep inode */ | |
380 | ihold(path.dentry->d_inode); | |
381 | path_put(&path); | |
382 | return file; | |
383 | } | |
384 | ||
385 | sock->file = file; | |
386 | file->f_flags = O_RDWR | (flags & O_NONBLOCK); | |
387 | file->private_data = sock; | |
388 | return file; | |
389 | } | |
390 | EXPORT_SYMBOL(sock_alloc_file); | |
391 | ||
392 | static int sock_map_fd(struct socket *sock, int flags) | |
393 | { | |
394 | struct file *newfile; | |
395 | int fd = get_unused_fd_flags(flags); | |
396 | if (unlikely(fd < 0)) | |
397 | return fd; | |
398 | ||
399 | newfile = sock_alloc_file(sock, flags, NULL); | |
400 | if (likely(!IS_ERR(newfile))) { | |
401 | fd_install(fd, newfile); | |
402 | return fd; | |
403 | } | |
404 | ||
405 | put_unused_fd(fd); | |
406 | return PTR_ERR(newfile); | |
407 | } | |
408 | ||
409 | struct socket *sock_from_file(struct file *file, int *err) | |
410 | { | |
411 | if (file->f_op == &socket_file_ops) | |
412 | return file->private_data; /* set in sock_map_fd */ | |
413 | ||
414 | *err = -ENOTSOCK; | |
415 | return NULL; | |
416 | } | |
417 | EXPORT_SYMBOL(sock_from_file); | |
418 | ||
419 | /** | |
420 | * sockfd_lookup - Go from a file number to its socket slot | |
421 | * @fd: file handle | |
422 | * @err: pointer to an error code return | |
423 | * | |
424 | * The file handle passed in is locked and the socket it is bound | |
425 | * too is returned. If an error occurs the err pointer is overwritten | |
426 | * with a negative errno code and NULL is returned. The function checks | |
427 | * for both invalid handles and passing a handle which is not a socket. | |
428 | * | |
429 | * On a success the socket object pointer is returned. | |
430 | */ | |
431 | ||
432 | struct socket *sockfd_lookup(int fd, int *err) | |
433 | { | |
434 | struct file *file; | |
435 | struct socket *sock; | |
436 | ||
437 | file = fget(fd); | |
438 | if (!file) { | |
439 | *err = -EBADF; | |
440 | return NULL; | |
441 | } | |
442 | ||
443 | sock = sock_from_file(file, err); | |
444 | if (!sock) | |
445 | fput(file); | |
446 | return sock; | |
447 | } | |
448 | EXPORT_SYMBOL(sockfd_lookup); | |
449 | ||
450 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) | |
451 | { | |
452 | struct fd f = fdget(fd); | |
453 | struct socket *sock; | |
454 | ||
455 | *err = -EBADF; | |
456 | if (f.file) { | |
457 | sock = sock_from_file(f.file, err); | |
458 | if (likely(sock)) { | |
459 | *fput_needed = f.flags; | |
460 | return sock; | |
461 | } | |
462 | fdput(f); | |
463 | } | |
464 | return NULL; | |
465 | } | |
466 | ||
467 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
468 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
469 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
470 | static ssize_t sockfs_getxattr(struct dentry *dentry, | |
471 | const char *name, void *value, size_t size) | |
472 | { | |
473 | const char *proto_name; | |
474 | size_t proto_size; | |
475 | int error; | |
476 | ||
477 | error = -ENODATA; | |
478 | if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) { | |
479 | proto_name = dentry->d_name.name; | |
480 | proto_size = strlen(proto_name); | |
481 | ||
482 | if (value) { | |
483 | error = -ERANGE; | |
484 | if (proto_size + 1 > size) | |
485 | goto out; | |
486 | ||
487 | strncpy(value, proto_name, proto_size + 1); | |
488 | } | |
489 | error = proto_size + 1; | |
490 | } | |
491 | ||
492 | out: | |
493 | return error; | |
494 | } | |
495 | ||
496 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, | |
497 | size_t size) | |
498 | { | |
499 | ssize_t len; | |
500 | ssize_t used = 0; | |
501 | ||
502 | len = security_inode_listsecurity(dentry->d_inode, buffer, size); | |
503 | if (len < 0) | |
504 | return len; | |
505 | used += len; | |
506 | if (buffer) { | |
507 | if (size < used) | |
508 | return -ERANGE; | |
509 | buffer += len; | |
510 | } | |
511 | ||
512 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
513 | used += len; | |
514 | if (buffer) { | |
515 | if (size < used) | |
516 | return -ERANGE; | |
517 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
518 | buffer += len; | |
519 | } | |
520 | ||
521 | return used; | |
522 | } | |
523 | ||
524 | static const struct inode_operations sockfs_inode_ops = { | |
525 | .getxattr = sockfs_getxattr, | |
526 | .listxattr = sockfs_listxattr, | |
527 | }; | |
528 | ||
529 | /** | |
530 | * sock_alloc - allocate a socket | |
531 | * | |
532 | * Allocate a new inode and socket object. The two are bound together | |
533 | * and initialised. The socket is then returned. If we are out of inodes | |
534 | * NULL is returned. | |
535 | */ | |
536 | ||
537 | static struct socket *sock_alloc(void) | |
538 | { | |
539 | struct inode *inode; | |
540 | struct socket *sock; | |
541 | ||
542 | inode = new_inode_pseudo(sock_mnt->mnt_sb); | |
543 | if (!inode) | |
544 | return NULL; | |
545 | ||
546 | sock = SOCKET_I(inode); | |
547 | ||
548 | kmemcheck_annotate_bitfield(sock, type); | |
549 | inode->i_ino = get_next_ino(); | |
550 | inode->i_mode = S_IFSOCK | S_IRWXUGO; | |
551 | inode->i_uid = current_fsuid(); | |
552 | inode->i_gid = current_fsgid(); | |
553 | inode->i_op = &sockfs_inode_ops; | |
554 | ||
555 | this_cpu_add(sockets_in_use, 1); | |
556 | return sock; | |
557 | } | |
558 | ||
559 | /** | |
560 | * sock_release - close a socket | |
561 | * @sock: socket to close | |
562 | * | |
563 | * The socket is released from the protocol stack if it has a release | |
564 | * callback, and the inode is then released if the socket is bound to | |
565 | * an inode not a file. | |
566 | */ | |
567 | ||
568 | void sock_release(struct socket *sock) | |
569 | { | |
570 | if (sock->ops) { | |
571 | struct module *owner = sock->ops->owner; | |
572 | ||
573 | sock->ops->release(sock); | |
574 | sock->ops = NULL; | |
575 | module_put(owner); | |
576 | } | |
577 | ||
578 | if (rcu_dereference_protected(sock->wq, 1)->fasync_list) | |
579 | pr_err("%s: fasync list not empty!\n", __func__); | |
580 | ||
581 | if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags)) | |
582 | return; | |
583 | ||
584 | this_cpu_sub(sockets_in_use, 1); | |
585 | if (!sock->file) { | |
586 | iput(SOCK_INODE(sock)); | |
587 | return; | |
588 | } | |
589 | sock->file = NULL; | |
590 | } | |
591 | EXPORT_SYMBOL(sock_release); | |
592 | ||
593 | void __sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags) | |
594 | { | |
595 | u8 flags = *tx_flags; | |
596 | ||
597 | if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_HARDWARE) | |
598 | flags |= SKBTX_HW_TSTAMP; | |
599 | ||
600 | if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) | |
601 | flags |= SKBTX_SW_TSTAMP; | |
602 | ||
603 | if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED) | |
604 | flags |= SKBTX_SCHED_TSTAMP; | |
605 | ||
606 | if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK) | |
607 | flags |= SKBTX_ACK_TSTAMP; | |
608 | ||
609 | *tx_flags = flags; | |
610 | } | |
611 | EXPORT_SYMBOL(__sock_tx_timestamp); | |
612 | ||
613 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) | |
614 | { | |
615 | int ret = sock->ops->sendmsg(sock, msg, iov_iter_count(&msg->msg_iter)); | |
616 | BUG_ON(ret == -EIOCBQUEUED); | |
617 | return ret; | |
618 | } | |
619 | ||
620 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) | |
621 | { | |
622 | int err = security_socket_sendmsg(sock, msg, | |
623 | iov_iter_count(&msg->msg_iter)); | |
624 | ||
625 | return err ?: sock_sendmsg_nosec(sock, msg); | |
626 | } | |
627 | EXPORT_SYMBOL(sock_sendmsg); | |
628 | ||
629 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
630 | struct kvec *vec, size_t num, size_t size) | |
631 | { | |
632 | iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); | |
633 | return sock_sendmsg(sock, msg); | |
634 | } | |
635 | EXPORT_SYMBOL(kernel_sendmsg); | |
636 | ||
637 | /* | |
638 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
639 | */ | |
640 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
641 | struct sk_buff *skb) | |
642 | { | |
643 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); | |
644 | struct scm_timestamping tss; | |
645 | int empty = 1; | |
646 | struct skb_shared_hwtstamps *shhwtstamps = | |
647 | skb_hwtstamps(skb); | |
648 | ||
649 | /* Race occurred between timestamp enabling and packet | |
650 | receiving. Fill in the current time for now. */ | |
651 | if (need_software_tstamp && skb->tstamp.tv64 == 0) | |
652 | __net_timestamp(skb); | |
653 | ||
654 | if (need_software_tstamp) { | |
655 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
656 | struct timeval tv; | |
657 | skb_get_timestamp(skb, &tv); | |
658 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, | |
659 | sizeof(tv), &tv); | |
660 | } else { | |
661 | struct timespec ts; | |
662 | skb_get_timestampns(skb, &ts); | |
663 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, | |
664 | sizeof(ts), &ts); | |
665 | } | |
666 | } | |
667 | ||
668 | memset(&tss, 0, sizeof(tss)); | |
669 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && | |
670 | ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) | |
671 | empty = 0; | |
672 | if (shhwtstamps && | |
673 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && | |
674 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) | |
675 | empty = 0; | |
676 | if (!empty) | |
677 | put_cmsg(msg, SOL_SOCKET, | |
678 | SCM_TIMESTAMPING, sizeof(tss), &tss); | |
679 | } | |
680 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); | |
681 | ||
682 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
683 | struct sk_buff *skb) | |
684 | { | |
685 | int ack; | |
686 | ||
687 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
688 | return; | |
689 | if (!skb->wifi_acked_valid) | |
690 | return; | |
691 | ||
692 | ack = skb->wifi_acked; | |
693 | ||
694 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
695 | } | |
696 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
697 | ||
698 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, | |
699 | struct sk_buff *skb) | |
700 | { | |
701 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) | |
702 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, | |
703 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); | |
704 | } | |
705 | ||
706 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
707 | struct sk_buff *skb) | |
708 | { | |
709 | sock_recv_timestamp(msg, sk, skb); | |
710 | sock_recv_drops(msg, sk, skb); | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); | |
713 | ||
714 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, | |
715 | size_t size, int flags) | |
716 | { | |
717 | return sock->ops->recvmsg(sock, msg, size, flags); | |
718 | } | |
719 | ||
720 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, | |
721 | int flags) | |
722 | { | |
723 | int err = security_socket_recvmsg(sock, msg, size, flags); | |
724 | ||
725 | return err ?: sock_recvmsg_nosec(sock, msg, size, flags); | |
726 | } | |
727 | EXPORT_SYMBOL(sock_recvmsg); | |
728 | ||
729 | /** | |
730 | * kernel_recvmsg - Receive a message from a socket (kernel space) | |
731 | * @sock: The socket to receive the message from | |
732 | * @msg: Received message | |
733 | * @vec: Input s/g array for message data | |
734 | * @num: Size of input s/g array | |
735 | * @size: Number of bytes to read | |
736 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
737 | * | |
738 | * On return the msg structure contains the scatter/gather array passed in the | |
739 | * vec argument. The array is modified so that it consists of the unfilled | |
740 | * portion of the original array. | |
741 | * | |
742 | * The returned value is the total number of bytes received, or an error. | |
743 | */ | |
744 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, | |
745 | struct kvec *vec, size_t num, size_t size, int flags) | |
746 | { | |
747 | mm_segment_t oldfs = get_fs(); | |
748 | int result; | |
749 | ||
750 | iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); | |
751 | set_fs(KERNEL_DS); | |
752 | result = sock_recvmsg(sock, msg, size, flags); | |
753 | set_fs(oldfs); | |
754 | return result; | |
755 | } | |
756 | EXPORT_SYMBOL(kernel_recvmsg); | |
757 | ||
758 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
759 | int offset, size_t size, loff_t *ppos, int more) | |
760 | { | |
761 | struct socket *sock; | |
762 | int flags; | |
763 | ||
764 | sock = file->private_data; | |
765 | ||
766 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
767 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
768 | flags |= more; | |
769 | ||
770 | return kernel_sendpage(sock, page, offset, size, flags); | |
771 | } | |
772 | ||
773 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, | |
774 | struct pipe_inode_info *pipe, size_t len, | |
775 | unsigned int flags) | |
776 | { | |
777 | struct socket *sock = file->private_data; | |
778 | ||
779 | if (unlikely(!sock->ops->splice_read)) | |
780 | return -EINVAL; | |
781 | ||
782 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); | |
783 | } | |
784 | ||
785 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) | |
786 | { | |
787 | struct file *file = iocb->ki_filp; | |
788 | struct socket *sock = file->private_data; | |
789 | struct msghdr msg = {.msg_iter = *to, | |
790 | .msg_iocb = iocb}; | |
791 | ssize_t res; | |
792 | ||
793 | if (file->f_flags & O_NONBLOCK) | |
794 | msg.msg_flags = MSG_DONTWAIT; | |
795 | ||
796 | if (iocb->ki_pos != 0) | |
797 | return -ESPIPE; | |
798 | ||
799 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ | |
800 | return 0; | |
801 | ||
802 | res = sock_recvmsg(sock, &msg, iov_iter_count(to), msg.msg_flags); | |
803 | *to = msg.msg_iter; | |
804 | return res; | |
805 | } | |
806 | ||
807 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) | |
808 | { | |
809 | struct file *file = iocb->ki_filp; | |
810 | struct socket *sock = file->private_data; | |
811 | struct msghdr msg = {.msg_iter = *from, | |
812 | .msg_iocb = iocb}; | |
813 | ssize_t res; | |
814 | ||
815 | if (iocb->ki_pos != 0) | |
816 | return -ESPIPE; | |
817 | ||
818 | if (file->f_flags & O_NONBLOCK) | |
819 | msg.msg_flags = MSG_DONTWAIT; | |
820 | ||
821 | if (sock->type == SOCK_SEQPACKET) | |
822 | msg.msg_flags |= MSG_EOR; | |
823 | ||
824 | res = sock_sendmsg(sock, &msg); | |
825 | *from = msg.msg_iter; | |
826 | return res; | |
827 | } | |
828 | ||
829 | /* | |
830 | * Atomic setting of ioctl hooks to avoid race | |
831 | * with module unload. | |
832 | */ | |
833 | ||
834 | static DEFINE_MUTEX(br_ioctl_mutex); | |
835 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); | |
836 | ||
837 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) | |
838 | { | |
839 | mutex_lock(&br_ioctl_mutex); | |
840 | br_ioctl_hook = hook; | |
841 | mutex_unlock(&br_ioctl_mutex); | |
842 | } | |
843 | EXPORT_SYMBOL(brioctl_set); | |
844 | ||
845 | static DEFINE_MUTEX(vlan_ioctl_mutex); | |
846 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); | |
847 | ||
848 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) | |
849 | { | |
850 | mutex_lock(&vlan_ioctl_mutex); | |
851 | vlan_ioctl_hook = hook; | |
852 | mutex_unlock(&vlan_ioctl_mutex); | |
853 | } | |
854 | EXPORT_SYMBOL(vlan_ioctl_set); | |
855 | ||
856 | static DEFINE_MUTEX(dlci_ioctl_mutex); | |
857 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); | |
858 | ||
859 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) | |
860 | { | |
861 | mutex_lock(&dlci_ioctl_mutex); | |
862 | dlci_ioctl_hook = hook; | |
863 | mutex_unlock(&dlci_ioctl_mutex); | |
864 | } | |
865 | EXPORT_SYMBOL(dlci_ioctl_set); | |
866 | ||
867 | static long sock_do_ioctl(struct net *net, struct socket *sock, | |
868 | unsigned int cmd, unsigned long arg) | |
869 | { | |
870 | int err; | |
871 | void __user *argp = (void __user *)arg; | |
872 | ||
873 | err = sock->ops->ioctl(sock, cmd, arg); | |
874 | ||
875 | /* | |
876 | * If this ioctl is unknown try to hand it down | |
877 | * to the NIC driver. | |
878 | */ | |
879 | if (err == -ENOIOCTLCMD) | |
880 | err = dev_ioctl(net, cmd, argp); | |
881 | ||
882 | return err; | |
883 | } | |
884 | ||
885 | /* | |
886 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
887 | * what to do with it - that's up to the protocol still. | |
888 | */ | |
889 | ||
890 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
891 | { | |
892 | struct socket *sock; | |
893 | struct sock *sk; | |
894 | void __user *argp = (void __user *)arg; | |
895 | int pid, err; | |
896 | struct net *net; | |
897 | ||
898 | sock = file->private_data; | |
899 | sk = sock->sk; | |
900 | net = sock_net(sk); | |
901 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { | |
902 | err = dev_ioctl(net, cmd, argp); | |
903 | } else | |
904 | #ifdef CONFIG_WEXT_CORE | |
905 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { | |
906 | err = dev_ioctl(net, cmd, argp); | |
907 | } else | |
908 | #endif | |
909 | switch (cmd) { | |
910 | case FIOSETOWN: | |
911 | case SIOCSPGRP: | |
912 | err = -EFAULT; | |
913 | if (get_user(pid, (int __user *)argp)) | |
914 | break; | |
915 | f_setown(sock->file, pid, 1); | |
916 | err = 0; | |
917 | break; | |
918 | case FIOGETOWN: | |
919 | case SIOCGPGRP: | |
920 | err = put_user(f_getown(sock->file), | |
921 | (int __user *)argp); | |
922 | break; | |
923 | case SIOCGIFBR: | |
924 | case SIOCSIFBR: | |
925 | case SIOCBRADDBR: | |
926 | case SIOCBRDELBR: | |
927 | err = -ENOPKG; | |
928 | if (!br_ioctl_hook) | |
929 | request_module("bridge"); | |
930 | ||
931 | mutex_lock(&br_ioctl_mutex); | |
932 | if (br_ioctl_hook) | |
933 | err = br_ioctl_hook(net, cmd, argp); | |
934 | mutex_unlock(&br_ioctl_mutex); | |
935 | break; | |
936 | case SIOCGIFVLAN: | |
937 | case SIOCSIFVLAN: | |
938 | err = -ENOPKG; | |
939 | if (!vlan_ioctl_hook) | |
940 | request_module("8021q"); | |
941 | ||
942 | mutex_lock(&vlan_ioctl_mutex); | |
943 | if (vlan_ioctl_hook) | |
944 | err = vlan_ioctl_hook(net, argp); | |
945 | mutex_unlock(&vlan_ioctl_mutex); | |
946 | break; | |
947 | case SIOCADDDLCI: | |
948 | case SIOCDELDLCI: | |
949 | err = -ENOPKG; | |
950 | if (!dlci_ioctl_hook) | |
951 | request_module("dlci"); | |
952 | ||
953 | mutex_lock(&dlci_ioctl_mutex); | |
954 | if (dlci_ioctl_hook) | |
955 | err = dlci_ioctl_hook(cmd, argp); | |
956 | mutex_unlock(&dlci_ioctl_mutex); | |
957 | break; | |
958 | default: | |
959 | err = sock_do_ioctl(net, sock, cmd, arg); | |
960 | break; | |
961 | } | |
962 | return err; | |
963 | } | |
964 | ||
965 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
966 | { | |
967 | int err; | |
968 | struct socket *sock = NULL; | |
969 | ||
970 | err = security_socket_create(family, type, protocol, 1); | |
971 | if (err) | |
972 | goto out; | |
973 | ||
974 | sock = sock_alloc(); | |
975 | if (!sock) { | |
976 | err = -ENOMEM; | |
977 | goto out; | |
978 | } | |
979 | ||
980 | sock->type = type; | |
981 | err = security_socket_post_create(sock, family, type, protocol, 1); | |
982 | if (err) | |
983 | goto out_release; | |
984 | ||
985 | out: | |
986 | *res = sock; | |
987 | return err; | |
988 | out_release: | |
989 | sock_release(sock); | |
990 | sock = NULL; | |
991 | goto out; | |
992 | } | |
993 | EXPORT_SYMBOL(sock_create_lite); | |
994 | ||
995 | /* No kernel lock held - perfect */ | |
996 | static unsigned int sock_poll(struct file *file, poll_table *wait) | |
997 | { | |
998 | unsigned int busy_flag = 0; | |
999 | struct socket *sock; | |
1000 | ||
1001 | /* | |
1002 | * We can't return errors to poll, so it's either yes or no. | |
1003 | */ | |
1004 | sock = file->private_data; | |
1005 | ||
1006 | if (sk_can_busy_loop(sock->sk)) { | |
1007 | /* this socket can poll_ll so tell the system call */ | |
1008 | busy_flag = POLL_BUSY_LOOP; | |
1009 | ||
1010 | /* once, only if requested by syscall */ | |
1011 | if (wait && (wait->_key & POLL_BUSY_LOOP)) | |
1012 | sk_busy_loop(sock->sk, 1); | |
1013 | } | |
1014 | ||
1015 | return busy_flag | sock->ops->poll(file, sock, wait); | |
1016 | } | |
1017 | ||
1018 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) | |
1019 | { | |
1020 | struct socket *sock = file->private_data; | |
1021 | ||
1022 | return sock->ops->mmap(file, sock, vma); | |
1023 | } | |
1024 | ||
1025 | static int sock_close(struct inode *inode, struct file *filp) | |
1026 | { | |
1027 | sock_release(SOCKET_I(inode)); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Update the socket async list | |
1033 | * | |
1034 | * Fasync_list locking strategy. | |
1035 | * | |
1036 | * 1. fasync_list is modified only under process context socket lock | |
1037 | * i.e. under semaphore. | |
1038 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
1039 | * or under socket lock | |
1040 | */ | |
1041 | ||
1042 | static int sock_fasync(int fd, struct file *filp, int on) | |
1043 | { | |
1044 | struct socket *sock = filp->private_data; | |
1045 | struct sock *sk = sock->sk; | |
1046 | struct socket_wq *wq; | |
1047 | ||
1048 | if (sk == NULL) | |
1049 | return -EINVAL; | |
1050 | ||
1051 | lock_sock(sk); | |
1052 | wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk)); | |
1053 | fasync_helper(fd, filp, on, &wq->fasync_list); | |
1054 | ||
1055 | if (!wq->fasync_list) | |
1056 | sock_reset_flag(sk, SOCK_FASYNC); | |
1057 | else | |
1058 | sock_set_flag(sk, SOCK_FASYNC); | |
1059 | ||
1060 | release_sock(sk); | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | /* This function may be called only under socket lock or callback_lock or rcu_lock */ | |
1065 | ||
1066 | int sock_wake_async(struct socket *sock, int how, int band) | |
1067 | { | |
1068 | struct socket_wq *wq; | |
1069 | ||
1070 | if (!sock) | |
1071 | return -1; | |
1072 | rcu_read_lock(); | |
1073 | wq = rcu_dereference(sock->wq); | |
1074 | if (!wq || !wq->fasync_list) { | |
1075 | rcu_read_unlock(); | |
1076 | return -1; | |
1077 | } | |
1078 | switch (how) { | |
1079 | case SOCK_WAKE_WAITD: | |
1080 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) | |
1081 | break; | |
1082 | goto call_kill; | |
1083 | case SOCK_WAKE_SPACE: | |
1084 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) | |
1085 | break; | |
1086 | /* fall through */ | |
1087 | case SOCK_WAKE_IO: | |
1088 | call_kill: | |
1089 | kill_fasync(&wq->fasync_list, SIGIO, band); | |
1090 | break; | |
1091 | case SOCK_WAKE_URG: | |
1092 | kill_fasync(&wq->fasync_list, SIGURG, band); | |
1093 | } | |
1094 | rcu_read_unlock(); | |
1095 | return 0; | |
1096 | } | |
1097 | EXPORT_SYMBOL(sock_wake_async); | |
1098 | ||
1099 | int __sock_create(struct net *net, int family, int type, int protocol, | |
1100 | struct socket **res, int kern) | |
1101 | { | |
1102 | int err; | |
1103 | struct socket *sock; | |
1104 | const struct net_proto_family *pf; | |
1105 | ||
1106 | /* | |
1107 | * Check protocol is in range | |
1108 | */ | |
1109 | if (family < 0 || family >= NPROTO) | |
1110 | return -EAFNOSUPPORT; | |
1111 | if (type < 0 || type >= SOCK_MAX) | |
1112 | return -EINVAL; | |
1113 | ||
1114 | /* Compatibility. | |
1115 | ||
1116 | This uglymoron is moved from INET layer to here to avoid | |
1117 | deadlock in module load. | |
1118 | */ | |
1119 | if (family == PF_INET && type == SOCK_PACKET) { | |
1120 | static int warned; | |
1121 | if (!warned) { | |
1122 | warned = 1; | |
1123 | pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n", | |
1124 | current->comm); | |
1125 | } | |
1126 | family = PF_PACKET; | |
1127 | } | |
1128 | ||
1129 | err = security_socket_create(family, type, protocol, kern); | |
1130 | if (err) | |
1131 | return err; | |
1132 | ||
1133 | /* | |
1134 | * Allocate the socket and allow the family to set things up. if | |
1135 | * the protocol is 0, the family is instructed to select an appropriate | |
1136 | * default. | |
1137 | */ | |
1138 | sock = sock_alloc(); | |
1139 | if (!sock) { | |
1140 | net_warn_ratelimited("socket: no more sockets\n"); | |
1141 | return -ENFILE; /* Not exactly a match, but its the | |
1142 | closest posix thing */ | |
1143 | } | |
1144 | ||
1145 | sock->type = type; | |
1146 | ||
1147 | #ifdef CONFIG_MODULES | |
1148 | /* Attempt to load a protocol module if the find failed. | |
1149 | * | |
1150 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1151 | * requested real, full-featured networking support upon configuration. | |
1152 | * Otherwise module support will break! | |
1153 | */ | |
1154 | if (rcu_access_pointer(net_families[family]) == NULL) | |
1155 | request_module("net-pf-%d", family); | |
1156 | #endif | |
1157 | ||
1158 | rcu_read_lock(); | |
1159 | pf = rcu_dereference(net_families[family]); | |
1160 | err = -EAFNOSUPPORT; | |
1161 | if (!pf) | |
1162 | goto out_release; | |
1163 | ||
1164 | /* | |
1165 | * We will call the ->create function, that possibly is in a loadable | |
1166 | * module, so we have to bump that loadable module refcnt first. | |
1167 | */ | |
1168 | if (!try_module_get(pf->owner)) | |
1169 | goto out_release; | |
1170 | ||
1171 | /* Now protected by module ref count */ | |
1172 | rcu_read_unlock(); | |
1173 | ||
1174 | err = pf->create(net, sock, protocol, kern); | |
1175 | if (err < 0) | |
1176 | goto out_module_put; | |
1177 | ||
1178 | /* | |
1179 | * Now to bump the refcnt of the [loadable] module that owns this | |
1180 | * socket at sock_release time we decrement its refcnt. | |
1181 | */ | |
1182 | if (!try_module_get(sock->ops->owner)) | |
1183 | goto out_module_busy; | |
1184 | ||
1185 | /* | |
1186 | * Now that we're done with the ->create function, the [loadable] | |
1187 | * module can have its refcnt decremented | |
1188 | */ | |
1189 | module_put(pf->owner); | |
1190 | err = security_socket_post_create(sock, family, type, protocol, kern); | |
1191 | if (err) | |
1192 | goto out_sock_release; | |
1193 | *res = sock; | |
1194 | ||
1195 | return 0; | |
1196 | ||
1197 | out_module_busy: | |
1198 | err = -EAFNOSUPPORT; | |
1199 | out_module_put: | |
1200 | sock->ops = NULL; | |
1201 | module_put(pf->owner); | |
1202 | out_sock_release: | |
1203 | sock_release(sock); | |
1204 | return err; | |
1205 | ||
1206 | out_release: | |
1207 | rcu_read_unlock(); | |
1208 | goto out_sock_release; | |
1209 | } | |
1210 | EXPORT_SYMBOL(__sock_create); | |
1211 | ||
1212 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1213 | { | |
1214 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); | |
1215 | } | |
1216 | EXPORT_SYMBOL(sock_create); | |
1217 | ||
1218 | int sock_create_kern(int family, int type, int protocol, struct socket **res) | |
1219 | { | |
1220 | return __sock_create(&init_net, family, type, protocol, res, 1); | |
1221 | } | |
1222 | EXPORT_SYMBOL(sock_create_kern); | |
1223 | ||
1224 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) | |
1225 | { | |
1226 | int retval; | |
1227 | struct socket *sock; | |
1228 | int flags; | |
1229 | ||
1230 | /* Check the SOCK_* constants for consistency. */ | |
1231 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1232 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1233 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1234 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1235 | ||
1236 | flags = type & ~SOCK_TYPE_MASK; | |
1237 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1238 | return -EINVAL; | |
1239 | type &= SOCK_TYPE_MASK; | |
1240 | ||
1241 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1242 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1243 | ||
1244 | retval = sock_create(family, type, protocol, &sock); | |
1245 | if (retval < 0) | |
1246 | goto out; | |
1247 | ||
1248 | retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); | |
1249 | if (retval < 0) | |
1250 | goto out_release; | |
1251 | ||
1252 | out: | |
1253 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1254 | return retval; | |
1255 | ||
1256 | out_release: | |
1257 | sock_release(sock); | |
1258 | return retval; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Create a pair of connected sockets. | |
1263 | */ | |
1264 | ||
1265 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, | |
1266 | int __user *, usockvec) | |
1267 | { | |
1268 | struct socket *sock1, *sock2; | |
1269 | int fd1, fd2, err; | |
1270 | struct file *newfile1, *newfile2; | |
1271 | int flags; | |
1272 | ||
1273 | flags = type & ~SOCK_TYPE_MASK; | |
1274 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1275 | return -EINVAL; | |
1276 | type &= SOCK_TYPE_MASK; | |
1277 | ||
1278 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1279 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1280 | ||
1281 | /* | |
1282 | * Obtain the first socket and check if the underlying protocol | |
1283 | * supports the socketpair call. | |
1284 | */ | |
1285 | ||
1286 | err = sock_create(family, type, protocol, &sock1); | |
1287 | if (err < 0) | |
1288 | goto out; | |
1289 | ||
1290 | err = sock_create(family, type, protocol, &sock2); | |
1291 | if (err < 0) | |
1292 | goto out_release_1; | |
1293 | ||
1294 | err = sock1->ops->socketpair(sock1, sock2); | |
1295 | if (err < 0) | |
1296 | goto out_release_both; | |
1297 | ||
1298 | fd1 = get_unused_fd_flags(flags); | |
1299 | if (unlikely(fd1 < 0)) { | |
1300 | err = fd1; | |
1301 | goto out_release_both; | |
1302 | } | |
1303 | ||
1304 | fd2 = get_unused_fd_flags(flags); | |
1305 | if (unlikely(fd2 < 0)) { | |
1306 | err = fd2; | |
1307 | goto out_put_unused_1; | |
1308 | } | |
1309 | ||
1310 | newfile1 = sock_alloc_file(sock1, flags, NULL); | |
1311 | if (unlikely(IS_ERR(newfile1))) { | |
1312 | err = PTR_ERR(newfile1); | |
1313 | goto out_put_unused_both; | |
1314 | } | |
1315 | ||
1316 | newfile2 = sock_alloc_file(sock2, flags, NULL); | |
1317 | if (IS_ERR(newfile2)) { | |
1318 | err = PTR_ERR(newfile2); | |
1319 | goto out_fput_1; | |
1320 | } | |
1321 | ||
1322 | err = put_user(fd1, &usockvec[0]); | |
1323 | if (err) | |
1324 | goto out_fput_both; | |
1325 | ||
1326 | err = put_user(fd2, &usockvec[1]); | |
1327 | if (err) | |
1328 | goto out_fput_both; | |
1329 | ||
1330 | audit_fd_pair(fd1, fd2); | |
1331 | ||
1332 | fd_install(fd1, newfile1); | |
1333 | fd_install(fd2, newfile2); | |
1334 | /* fd1 and fd2 may be already another descriptors. | |
1335 | * Not kernel problem. | |
1336 | */ | |
1337 | ||
1338 | return 0; | |
1339 | ||
1340 | out_fput_both: | |
1341 | fput(newfile2); | |
1342 | fput(newfile1); | |
1343 | put_unused_fd(fd2); | |
1344 | put_unused_fd(fd1); | |
1345 | goto out; | |
1346 | ||
1347 | out_fput_1: | |
1348 | fput(newfile1); | |
1349 | put_unused_fd(fd2); | |
1350 | put_unused_fd(fd1); | |
1351 | sock_release(sock2); | |
1352 | goto out; | |
1353 | ||
1354 | out_put_unused_both: | |
1355 | put_unused_fd(fd2); | |
1356 | out_put_unused_1: | |
1357 | put_unused_fd(fd1); | |
1358 | out_release_both: | |
1359 | sock_release(sock2); | |
1360 | out_release_1: | |
1361 | sock_release(sock1); | |
1362 | out: | |
1363 | return err; | |
1364 | } | |
1365 | ||
1366 | /* | |
1367 | * Bind a name to a socket. Nothing much to do here since it's | |
1368 | * the protocol's responsibility to handle the local address. | |
1369 | * | |
1370 | * We move the socket address to kernel space before we call | |
1371 | * the protocol layer (having also checked the address is ok). | |
1372 | */ | |
1373 | ||
1374 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) | |
1375 | { | |
1376 | struct socket *sock; | |
1377 | struct sockaddr_storage address; | |
1378 | int err, fput_needed; | |
1379 | ||
1380 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1381 | if (sock) { | |
1382 | err = move_addr_to_kernel(umyaddr, addrlen, &address); | |
1383 | if (err >= 0) { | |
1384 | err = security_socket_bind(sock, | |
1385 | (struct sockaddr *)&address, | |
1386 | addrlen); | |
1387 | if (!err) | |
1388 | err = sock->ops->bind(sock, | |
1389 | (struct sockaddr *) | |
1390 | &address, addrlen); | |
1391 | } | |
1392 | fput_light(sock->file, fput_needed); | |
1393 | } | |
1394 | return err; | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * Perform a listen. Basically, we allow the protocol to do anything | |
1399 | * necessary for a listen, and if that works, we mark the socket as | |
1400 | * ready for listening. | |
1401 | */ | |
1402 | ||
1403 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) | |
1404 | { | |
1405 | struct socket *sock; | |
1406 | int err, fput_needed; | |
1407 | int somaxconn; | |
1408 | ||
1409 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1410 | if (sock) { | |
1411 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; | |
1412 | if ((unsigned int)backlog > somaxconn) | |
1413 | backlog = somaxconn; | |
1414 | ||
1415 | err = security_socket_listen(sock, backlog); | |
1416 | if (!err) | |
1417 | err = sock->ops->listen(sock, backlog); | |
1418 | ||
1419 | fput_light(sock->file, fput_needed); | |
1420 | } | |
1421 | return err; | |
1422 | } | |
1423 | ||
1424 | /* | |
1425 | * For accept, we attempt to create a new socket, set up the link | |
1426 | * with the client, wake up the client, then return the new | |
1427 | * connected fd. We collect the address of the connector in kernel | |
1428 | * space and move it to user at the very end. This is unclean because | |
1429 | * we open the socket then return an error. | |
1430 | * | |
1431 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1432 | * status to recvmsg. We need to add that support in a way thats | |
1433 | * clean when we restucture accept also. | |
1434 | */ | |
1435 | ||
1436 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1437 | int __user *, upeer_addrlen, int, flags) | |
1438 | { | |
1439 | struct socket *sock, *newsock; | |
1440 | struct file *newfile; | |
1441 | int err, len, newfd, fput_needed; | |
1442 | struct sockaddr_storage address; | |
1443 | ||
1444 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1445 | return -EINVAL; | |
1446 | ||
1447 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1448 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1449 | ||
1450 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1451 | if (!sock) | |
1452 | goto out; | |
1453 | ||
1454 | err = -ENFILE; | |
1455 | newsock = sock_alloc(); | |
1456 | if (!newsock) | |
1457 | goto out_put; | |
1458 | ||
1459 | newsock->type = sock->type; | |
1460 | newsock->ops = sock->ops; | |
1461 | ||
1462 | /* | |
1463 | * We don't need try_module_get here, as the listening socket (sock) | |
1464 | * has the protocol module (sock->ops->owner) held. | |
1465 | */ | |
1466 | __module_get(newsock->ops->owner); | |
1467 | ||
1468 | newfd = get_unused_fd_flags(flags); | |
1469 | if (unlikely(newfd < 0)) { | |
1470 | err = newfd; | |
1471 | sock_release(newsock); | |
1472 | goto out_put; | |
1473 | } | |
1474 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); | |
1475 | if (unlikely(IS_ERR(newfile))) { | |
1476 | err = PTR_ERR(newfile); | |
1477 | put_unused_fd(newfd); | |
1478 | sock_release(newsock); | |
1479 | goto out_put; | |
1480 | } | |
1481 | ||
1482 | err = security_socket_accept(sock, newsock); | |
1483 | if (err) | |
1484 | goto out_fd; | |
1485 | ||
1486 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); | |
1487 | if (err < 0) | |
1488 | goto out_fd; | |
1489 | ||
1490 | if (upeer_sockaddr) { | |
1491 | if (newsock->ops->getname(newsock, (struct sockaddr *)&address, | |
1492 | &len, 2) < 0) { | |
1493 | err = -ECONNABORTED; | |
1494 | goto out_fd; | |
1495 | } | |
1496 | err = move_addr_to_user(&address, | |
1497 | len, upeer_sockaddr, upeer_addrlen); | |
1498 | if (err < 0) | |
1499 | goto out_fd; | |
1500 | } | |
1501 | ||
1502 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1503 | ||
1504 | fd_install(newfd, newfile); | |
1505 | err = newfd; | |
1506 | ||
1507 | out_put: | |
1508 | fput_light(sock->file, fput_needed); | |
1509 | out: | |
1510 | return err; | |
1511 | out_fd: | |
1512 | fput(newfile); | |
1513 | put_unused_fd(newfd); | |
1514 | goto out_put; | |
1515 | } | |
1516 | ||
1517 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1518 | int __user *, upeer_addrlen) | |
1519 | { | |
1520 | return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); | |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * Attempt to connect to a socket with the server address. The address | |
1525 | * is in user space so we verify it is OK and move it to kernel space. | |
1526 | * | |
1527 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1528 | * break bindings | |
1529 | * | |
1530 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1531 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1532 | * include the -EINPROGRESS status for such sockets. | |
1533 | */ | |
1534 | ||
1535 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, | |
1536 | int, addrlen) | |
1537 | { | |
1538 | struct socket *sock; | |
1539 | struct sockaddr_storage address; | |
1540 | int err, fput_needed; | |
1541 | ||
1542 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1543 | if (!sock) | |
1544 | goto out; | |
1545 | err = move_addr_to_kernel(uservaddr, addrlen, &address); | |
1546 | if (err < 0) | |
1547 | goto out_put; | |
1548 | ||
1549 | err = | |
1550 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); | |
1551 | if (err) | |
1552 | goto out_put; | |
1553 | ||
1554 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, | |
1555 | sock->file->f_flags); | |
1556 | out_put: | |
1557 | fput_light(sock->file, fput_needed); | |
1558 | out: | |
1559 | return err; | |
1560 | } | |
1561 | ||
1562 | /* | |
1563 | * Get the local address ('name') of a socket object. Move the obtained | |
1564 | * name to user space. | |
1565 | */ | |
1566 | ||
1567 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, | |
1568 | int __user *, usockaddr_len) | |
1569 | { | |
1570 | struct socket *sock; | |
1571 | struct sockaddr_storage address; | |
1572 | int len, err, fput_needed; | |
1573 | ||
1574 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1575 | if (!sock) | |
1576 | goto out; | |
1577 | ||
1578 | err = security_socket_getsockname(sock); | |
1579 | if (err) | |
1580 | goto out_put; | |
1581 | ||
1582 | err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); | |
1583 | if (err) | |
1584 | goto out_put; | |
1585 | err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); | |
1586 | ||
1587 | out_put: | |
1588 | fput_light(sock->file, fput_needed); | |
1589 | out: | |
1590 | return err; | |
1591 | } | |
1592 | ||
1593 | /* | |
1594 | * Get the remote address ('name') of a socket object. Move the obtained | |
1595 | * name to user space. | |
1596 | */ | |
1597 | ||
1598 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, | |
1599 | int __user *, usockaddr_len) | |
1600 | { | |
1601 | struct socket *sock; | |
1602 | struct sockaddr_storage address; | |
1603 | int len, err, fput_needed; | |
1604 | ||
1605 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1606 | if (sock != NULL) { | |
1607 | err = security_socket_getpeername(sock); | |
1608 | if (err) { | |
1609 | fput_light(sock->file, fput_needed); | |
1610 | return err; | |
1611 | } | |
1612 | ||
1613 | err = | |
1614 | sock->ops->getname(sock, (struct sockaddr *)&address, &len, | |
1615 | 1); | |
1616 | if (!err) | |
1617 | err = move_addr_to_user(&address, len, usockaddr, | |
1618 | usockaddr_len); | |
1619 | fput_light(sock->file, fput_needed); | |
1620 | } | |
1621 | return err; | |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * Send a datagram to a given address. We move the address into kernel | |
1626 | * space and check the user space data area is readable before invoking | |
1627 | * the protocol. | |
1628 | */ | |
1629 | ||
1630 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, | |
1631 | unsigned int, flags, struct sockaddr __user *, addr, | |
1632 | int, addr_len) | |
1633 | { | |
1634 | struct socket *sock; | |
1635 | struct sockaddr_storage address; | |
1636 | int err; | |
1637 | struct msghdr msg; | |
1638 | struct iovec iov; | |
1639 | int fput_needed; | |
1640 | ||
1641 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); | |
1642 | if (unlikely(err)) | |
1643 | return err; | |
1644 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1645 | if (!sock) | |
1646 | goto out; | |
1647 | ||
1648 | msg.msg_name = NULL; | |
1649 | msg.msg_control = NULL; | |
1650 | msg.msg_controllen = 0; | |
1651 | msg.msg_namelen = 0; | |
1652 | if (addr) { | |
1653 | err = move_addr_to_kernel(addr, addr_len, &address); | |
1654 | if (err < 0) | |
1655 | goto out_put; | |
1656 | msg.msg_name = (struct sockaddr *)&address; | |
1657 | msg.msg_namelen = addr_len; | |
1658 | } | |
1659 | if (sock->file->f_flags & O_NONBLOCK) | |
1660 | flags |= MSG_DONTWAIT; | |
1661 | msg.msg_flags = flags; | |
1662 | err = sock_sendmsg(sock, &msg); | |
1663 | ||
1664 | out_put: | |
1665 | fput_light(sock->file, fput_needed); | |
1666 | out: | |
1667 | return err; | |
1668 | } | |
1669 | ||
1670 | /* | |
1671 | * Send a datagram down a socket. | |
1672 | */ | |
1673 | ||
1674 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, | |
1675 | unsigned int, flags) | |
1676 | { | |
1677 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1678 | } | |
1679 | ||
1680 | /* | |
1681 | * Receive a frame from the socket and optionally record the address of the | |
1682 | * sender. We verify the buffers are writable and if needed move the | |
1683 | * sender address from kernel to user space. | |
1684 | */ | |
1685 | ||
1686 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, | |
1687 | unsigned int, flags, struct sockaddr __user *, addr, | |
1688 | int __user *, addr_len) | |
1689 | { | |
1690 | struct socket *sock; | |
1691 | struct iovec iov; | |
1692 | struct msghdr msg; | |
1693 | struct sockaddr_storage address; | |
1694 | int err, err2; | |
1695 | int fput_needed; | |
1696 | ||
1697 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); | |
1698 | if (unlikely(err)) | |
1699 | return err; | |
1700 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1701 | if (!sock) | |
1702 | goto out; | |
1703 | ||
1704 | msg.msg_control = NULL; | |
1705 | msg.msg_controllen = 0; | |
1706 | /* Save some cycles and don't copy the address if not needed */ | |
1707 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; | |
1708 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
1709 | msg.msg_namelen = 0; | |
1710 | if (sock->file->f_flags & O_NONBLOCK) | |
1711 | flags |= MSG_DONTWAIT; | |
1712 | err = sock_recvmsg(sock, &msg, iov_iter_count(&msg.msg_iter), flags); | |
1713 | ||
1714 | if (err >= 0 && addr != NULL) { | |
1715 | err2 = move_addr_to_user(&address, | |
1716 | msg.msg_namelen, addr, addr_len); | |
1717 | if (err2 < 0) | |
1718 | err = err2; | |
1719 | } | |
1720 | ||
1721 | fput_light(sock->file, fput_needed); | |
1722 | out: | |
1723 | return err; | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * Receive a datagram from a socket. | |
1728 | */ | |
1729 | ||
1730 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, | |
1731 | unsigned int, flags) | |
1732 | { | |
1733 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1734 | } | |
1735 | ||
1736 | /* | |
1737 | * Set a socket option. Because we don't know the option lengths we have | |
1738 | * to pass the user mode parameter for the protocols to sort out. | |
1739 | */ | |
1740 | ||
1741 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, | |
1742 | char __user *, optval, int, optlen) | |
1743 | { | |
1744 | int err, fput_needed; | |
1745 | struct socket *sock; | |
1746 | ||
1747 | if (optlen < 0) | |
1748 | return -EINVAL; | |
1749 | ||
1750 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1751 | if (sock != NULL) { | |
1752 | err = security_socket_setsockopt(sock, level, optname); | |
1753 | if (err) | |
1754 | goto out_put; | |
1755 | ||
1756 | if (level == SOL_SOCKET) | |
1757 | err = | |
1758 | sock_setsockopt(sock, level, optname, optval, | |
1759 | optlen); | |
1760 | else | |
1761 | err = | |
1762 | sock->ops->setsockopt(sock, level, optname, optval, | |
1763 | optlen); | |
1764 | out_put: | |
1765 | fput_light(sock->file, fput_needed); | |
1766 | } | |
1767 | return err; | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Get a socket option. Because we don't know the option lengths we have | |
1772 | * to pass a user mode parameter for the protocols to sort out. | |
1773 | */ | |
1774 | ||
1775 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, | |
1776 | char __user *, optval, int __user *, optlen) | |
1777 | { | |
1778 | int err, fput_needed; | |
1779 | struct socket *sock; | |
1780 | ||
1781 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1782 | if (sock != NULL) { | |
1783 | err = security_socket_getsockopt(sock, level, optname); | |
1784 | if (err) | |
1785 | goto out_put; | |
1786 | ||
1787 | if (level == SOL_SOCKET) | |
1788 | err = | |
1789 | sock_getsockopt(sock, level, optname, optval, | |
1790 | optlen); | |
1791 | else | |
1792 | err = | |
1793 | sock->ops->getsockopt(sock, level, optname, optval, | |
1794 | optlen); | |
1795 | out_put: | |
1796 | fput_light(sock->file, fput_needed); | |
1797 | } | |
1798 | return err; | |
1799 | } | |
1800 | ||
1801 | /* | |
1802 | * Shutdown a socket. | |
1803 | */ | |
1804 | ||
1805 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) | |
1806 | { | |
1807 | int err, fput_needed; | |
1808 | struct socket *sock; | |
1809 | ||
1810 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1811 | if (sock != NULL) { | |
1812 | err = security_socket_shutdown(sock, how); | |
1813 | if (!err) | |
1814 | err = sock->ops->shutdown(sock, how); | |
1815 | fput_light(sock->file, fput_needed); | |
1816 | } | |
1817 | return err; | |
1818 | } | |
1819 | ||
1820 | /* A couple of helpful macros for getting the address of the 32/64 bit | |
1821 | * fields which are the same type (int / unsigned) on our platforms. | |
1822 | */ | |
1823 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1824 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1825 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1826 | ||
1827 | struct used_address { | |
1828 | struct sockaddr_storage name; | |
1829 | unsigned int name_len; | |
1830 | }; | |
1831 | ||
1832 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
1833 | struct user_msghdr __user *umsg, | |
1834 | struct sockaddr __user **save_addr, | |
1835 | struct iovec **iov) | |
1836 | { | |
1837 | struct sockaddr __user *uaddr; | |
1838 | struct iovec __user *uiov; | |
1839 | size_t nr_segs; | |
1840 | ssize_t err; | |
1841 | ||
1842 | if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || | |
1843 | __get_user(uaddr, &umsg->msg_name) || | |
1844 | __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || | |
1845 | __get_user(uiov, &umsg->msg_iov) || | |
1846 | __get_user(nr_segs, &umsg->msg_iovlen) || | |
1847 | __get_user(kmsg->msg_control, &umsg->msg_control) || | |
1848 | __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || | |
1849 | __get_user(kmsg->msg_flags, &umsg->msg_flags)) | |
1850 | return -EFAULT; | |
1851 | ||
1852 | if (!uaddr) | |
1853 | kmsg->msg_namelen = 0; | |
1854 | ||
1855 | if (kmsg->msg_namelen < 0) | |
1856 | return -EINVAL; | |
1857 | ||
1858 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) | |
1859 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); | |
1860 | ||
1861 | if (save_addr) | |
1862 | *save_addr = uaddr; | |
1863 | ||
1864 | if (uaddr && kmsg->msg_namelen) { | |
1865 | if (!save_addr) { | |
1866 | err = move_addr_to_kernel(uaddr, kmsg->msg_namelen, | |
1867 | kmsg->msg_name); | |
1868 | if (err < 0) | |
1869 | return err; | |
1870 | } | |
1871 | } else { | |
1872 | kmsg->msg_name = NULL; | |
1873 | kmsg->msg_namelen = 0; | |
1874 | } | |
1875 | ||
1876 | if (nr_segs > UIO_MAXIOV) | |
1877 | return -EMSGSIZE; | |
1878 | ||
1879 | kmsg->msg_iocb = NULL; | |
1880 | ||
1881 | return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs, | |
1882 | UIO_FASTIOV, iov, &kmsg->msg_iter); | |
1883 | } | |
1884 | ||
1885 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
1886 | struct msghdr *msg_sys, unsigned int flags, | |
1887 | struct used_address *used_address) | |
1888 | { | |
1889 | struct compat_msghdr __user *msg_compat = | |
1890 | (struct compat_msghdr __user *)msg; | |
1891 | struct sockaddr_storage address; | |
1892 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1893 | unsigned char ctl[sizeof(struct cmsghdr) + 20] | |
1894 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); | |
1895 | /* 20 is size of ipv6_pktinfo */ | |
1896 | unsigned char *ctl_buf = ctl; | |
1897 | int ctl_len; | |
1898 | ssize_t err; | |
1899 | ||
1900 | msg_sys->msg_name = &address; | |
1901 | ||
1902 | if (MSG_CMSG_COMPAT & flags) | |
1903 | err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); | |
1904 | else | |
1905 | err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); | |
1906 | if (err < 0) | |
1907 | return err; | |
1908 | ||
1909 | err = -ENOBUFS; | |
1910 | ||
1911 | if (msg_sys->msg_controllen > INT_MAX) | |
1912 | goto out_freeiov; | |
1913 | ctl_len = msg_sys->msg_controllen; | |
1914 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { | |
1915 | err = | |
1916 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, | |
1917 | sizeof(ctl)); | |
1918 | if (err) | |
1919 | goto out_freeiov; | |
1920 | ctl_buf = msg_sys->msg_control; | |
1921 | ctl_len = msg_sys->msg_controllen; | |
1922 | } else if (ctl_len) { | |
1923 | if (ctl_len > sizeof(ctl)) { | |
1924 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); | |
1925 | if (ctl_buf == NULL) | |
1926 | goto out_freeiov; | |
1927 | } | |
1928 | err = -EFAULT; | |
1929 | /* | |
1930 | * Careful! Before this, msg_sys->msg_control contains a user pointer. | |
1931 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1932 | * checking falls down on this. | |
1933 | */ | |
1934 | if (copy_from_user(ctl_buf, | |
1935 | (void __user __force *)msg_sys->msg_control, | |
1936 | ctl_len)) | |
1937 | goto out_freectl; | |
1938 | msg_sys->msg_control = ctl_buf; | |
1939 | } | |
1940 | msg_sys->msg_flags = flags; | |
1941 | ||
1942 | if (sock->file->f_flags & O_NONBLOCK) | |
1943 | msg_sys->msg_flags |= MSG_DONTWAIT; | |
1944 | /* | |
1945 | * If this is sendmmsg() and current destination address is same as | |
1946 | * previously succeeded address, omit asking LSM's decision. | |
1947 | * used_address->name_len is initialized to UINT_MAX so that the first | |
1948 | * destination address never matches. | |
1949 | */ | |
1950 | if (used_address && msg_sys->msg_name && | |
1951 | used_address->name_len == msg_sys->msg_namelen && | |
1952 | !memcmp(&used_address->name, msg_sys->msg_name, | |
1953 | used_address->name_len)) { | |
1954 | err = sock_sendmsg_nosec(sock, msg_sys); | |
1955 | goto out_freectl; | |
1956 | } | |
1957 | err = sock_sendmsg(sock, msg_sys); | |
1958 | /* | |
1959 | * If this is sendmmsg() and sending to current destination address was | |
1960 | * successful, remember it. | |
1961 | */ | |
1962 | if (used_address && err >= 0) { | |
1963 | used_address->name_len = msg_sys->msg_namelen; | |
1964 | if (msg_sys->msg_name) | |
1965 | memcpy(&used_address->name, msg_sys->msg_name, | |
1966 | used_address->name_len); | |
1967 | } | |
1968 | ||
1969 | out_freectl: | |
1970 | if (ctl_buf != ctl) | |
1971 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); | |
1972 | out_freeiov: | |
1973 | kfree(iov); | |
1974 | return err; | |
1975 | } | |
1976 | ||
1977 | /* | |
1978 | * BSD sendmsg interface | |
1979 | */ | |
1980 | ||
1981 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) | |
1982 | { | |
1983 | int fput_needed, err; | |
1984 | struct msghdr msg_sys; | |
1985 | struct socket *sock; | |
1986 | ||
1987 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1988 | if (!sock) | |
1989 | goto out; | |
1990 | ||
1991 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL); | |
1992 | ||
1993 | fput_light(sock->file, fput_needed); | |
1994 | out: | |
1995 | return err; | |
1996 | } | |
1997 | ||
1998 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) | |
1999 | { | |
2000 | if (flags & MSG_CMSG_COMPAT) | |
2001 | return -EINVAL; | |
2002 | return __sys_sendmsg(fd, msg, flags); | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * Linux sendmmsg interface | |
2007 | */ | |
2008 | ||
2009 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
2010 | unsigned int flags) | |
2011 | { | |
2012 | int fput_needed, err, datagrams; | |
2013 | struct socket *sock; | |
2014 | struct mmsghdr __user *entry; | |
2015 | struct compat_mmsghdr __user *compat_entry; | |
2016 | struct msghdr msg_sys; | |
2017 | struct used_address used_address; | |
2018 | ||
2019 | if (vlen > UIO_MAXIOV) | |
2020 | vlen = UIO_MAXIOV; | |
2021 | ||
2022 | datagrams = 0; | |
2023 | ||
2024 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2025 | if (!sock) | |
2026 | return err; | |
2027 | ||
2028 | used_address.name_len = UINT_MAX; | |
2029 | entry = mmsg; | |
2030 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
2031 | err = 0; | |
2032 | ||
2033 | while (datagrams < vlen) { | |
2034 | if (MSG_CMSG_COMPAT & flags) { | |
2035 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, | |
2036 | &msg_sys, flags, &used_address); | |
2037 | if (err < 0) | |
2038 | break; | |
2039 | err = __put_user(err, &compat_entry->msg_len); | |
2040 | ++compat_entry; | |
2041 | } else { | |
2042 | err = ___sys_sendmsg(sock, | |
2043 | (struct user_msghdr __user *)entry, | |
2044 | &msg_sys, flags, &used_address); | |
2045 | if (err < 0) | |
2046 | break; | |
2047 | err = put_user(err, &entry->msg_len); | |
2048 | ++entry; | |
2049 | } | |
2050 | ||
2051 | if (err) | |
2052 | break; | |
2053 | ++datagrams; | |
2054 | } | |
2055 | ||
2056 | fput_light(sock->file, fput_needed); | |
2057 | ||
2058 | /* We only return an error if no datagrams were able to be sent */ | |
2059 | if (datagrams != 0) | |
2060 | return datagrams; | |
2061 | ||
2062 | return err; | |
2063 | } | |
2064 | ||
2065 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2066 | unsigned int, vlen, unsigned int, flags) | |
2067 | { | |
2068 | if (flags & MSG_CMSG_COMPAT) | |
2069 | return -EINVAL; | |
2070 | return __sys_sendmmsg(fd, mmsg, vlen, flags); | |
2071 | } | |
2072 | ||
2073 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2074 | struct msghdr *msg_sys, unsigned int 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 total_len, len; | |
2082 | ssize_t err; | |
2083 | ||
2084 | /* kernel mode address */ | |
2085 | struct sockaddr_storage addr; | |
2086 | ||
2087 | /* user mode address pointers */ | |
2088 | struct sockaddr __user *uaddr; | |
2089 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2090 | ||
2091 | msg_sys->msg_name = &addr; | |
2092 | ||
2093 | if (MSG_CMSG_COMPAT & flags) | |
2094 | err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); | |
2095 | else | |
2096 | err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); | |
2097 | if (err < 0) | |
2098 | return err; | |
2099 | total_len = iov_iter_count(&msg_sys->msg_iter); | |
2100 | ||
2101 | cmsg_ptr = (unsigned long)msg_sys->msg_control; | |
2102 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
2103 | ||
2104 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
2105 | msg_sys->msg_namelen = 0; | |
2106 | ||
2107 | if (sock->file->f_flags & O_NONBLOCK) | |
2108 | flags |= MSG_DONTWAIT; | |
2109 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, | |
2110 | total_len, flags); | |
2111 | if (err < 0) | |
2112 | goto out_freeiov; | |
2113 | len = err; | |
2114 | ||
2115 | if (uaddr != NULL) { | |
2116 | err = move_addr_to_user(&addr, | |
2117 | msg_sys->msg_namelen, uaddr, | |
2118 | uaddr_len); | |
2119 | if (err < 0) | |
2120 | goto out_freeiov; | |
2121 | } | |
2122 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), | |
2123 | COMPAT_FLAGS(msg)); | |
2124 | if (err) | |
2125 | goto out_freeiov; | |
2126 | if (MSG_CMSG_COMPAT & flags) | |
2127 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2128 | &msg_compat->msg_controllen); | |
2129 | else | |
2130 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2131 | &msg->msg_controllen); | |
2132 | if (err) | |
2133 | goto out_freeiov; | |
2134 | err = len; | |
2135 | ||
2136 | out_freeiov: | |
2137 | kfree(iov); | |
2138 | return err; | |
2139 | } | |
2140 | ||
2141 | /* | |
2142 | * BSD recvmsg interface | |
2143 | */ | |
2144 | ||
2145 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) | |
2146 | { | |
2147 | int fput_needed, err; | |
2148 | struct msghdr msg_sys; | |
2149 | struct socket *sock; | |
2150 | ||
2151 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2152 | if (!sock) | |
2153 | goto out; | |
2154 | ||
2155 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); | |
2156 | ||
2157 | fput_light(sock->file, fput_needed); | |
2158 | out: | |
2159 | return err; | |
2160 | } | |
2161 | ||
2162 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, | |
2163 | unsigned int, flags) | |
2164 | { | |
2165 | if (flags & MSG_CMSG_COMPAT) | |
2166 | return -EINVAL; | |
2167 | return __sys_recvmsg(fd, msg, flags); | |
2168 | } | |
2169 | ||
2170 | /* | |
2171 | * Linux recvmmsg interface | |
2172 | */ | |
2173 | ||
2174 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
2175 | unsigned int flags, struct timespec *timeout) | |
2176 | { | |
2177 | int fput_needed, err, datagrams; | |
2178 | struct socket *sock; | |
2179 | struct mmsghdr __user *entry; | |
2180 | struct compat_mmsghdr __user *compat_entry; | |
2181 | struct msghdr msg_sys; | |
2182 | struct timespec end_time; | |
2183 | ||
2184 | if (timeout && | |
2185 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2186 | timeout->tv_nsec)) | |
2187 | return -EINVAL; | |
2188 | ||
2189 | datagrams = 0; | |
2190 | ||
2191 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2192 | if (!sock) | |
2193 | return err; | |
2194 | ||
2195 | err = sock_error(sock->sk); | |
2196 | if (err) | |
2197 | goto out_put; | |
2198 | ||
2199 | entry = mmsg; | |
2200 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
2201 | ||
2202 | while (datagrams < vlen) { | |
2203 | /* | |
2204 | * No need to ask LSM for more than the first datagram. | |
2205 | */ | |
2206 | if (MSG_CMSG_COMPAT & flags) { | |
2207 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, | |
2208 | &msg_sys, flags & ~MSG_WAITFORONE, | |
2209 | datagrams); | |
2210 | if (err < 0) | |
2211 | break; | |
2212 | err = __put_user(err, &compat_entry->msg_len); | |
2213 | ++compat_entry; | |
2214 | } else { | |
2215 | err = ___sys_recvmsg(sock, | |
2216 | (struct user_msghdr __user *)entry, | |
2217 | &msg_sys, flags & ~MSG_WAITFORONE, | |
2218 | datagrams); | |
2219 | if (err < 0) | |
2220 | break; | |
2221 | err = put_user(err, &entry->msg_len); | |
2222 | ++entry; | |
2223 | } | |
2224 | ||
2225 | if (err) | |
2226 | break; | |
2227 | ++datagrams; | |
2228 | ||
2229 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ | |
2230 | if (flags & MSG_WAITFORONE) | |
2231 | flags |= MSG_DONTWAIT; | |
2232 | ||
2233 | if (timeout) { | |
2234 | ktime_get_ts(timeout); | |
2235 | *timeout = timespec_sub(end_time, *timeout); | |
2236 | if (timeout->tv_sec < 0) { | |
2237 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2238 | break; | |
2239 | } | |
2240 | ||
2241 | /* Timeout, return less than vlen datagrams */ | |
2242 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2243 | break; | |
2244 | } | |
2245 | ||
2246 | /* Out of band data, return right away */ | |
2247 | if (msg_sys.msg_flags & MSG_OOB) | |
2248 | break; | |
2249 | } | |
2250 | ||
2251 | out_put: | |
2252 | fput_light(sock->file, fput_needed); | |
2253 | ||
2254 | if (err == 0) | |
2255 | return datagrams; | |
2256 | ||
2257 | if (datagrams != 0) { | |
2258 | /* | |
2259 | * We may return less entries than requested (vlen) if the | |
2260 | * sock is non block and there aren't enough datagrams... | |
2261 | */ | |
2262 | if (err != -EAGAIN) { | |
2263 | /* | |
2264 | * ... or if recvmsg returns an error after we | |
2265 | * received some datagrams, where we record the | |
2266 | * error to return on the next call or if the | |
2267 | * app asks about it using getsockopt(SO_ERROR). | |
2268 | */ | |
2269 | sock->sk->sk_err = -err; | |
2270 | } | |
2271 | ||
2272 | return datagrams; | |
2273 | } | |
2274 | ||
2275 | return err; | |
2276 | } | |
2277 | ||
2278 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2279 | unsigned int, vlen, unsigned int, flags, | |
2280 | struct timespec __user *, timeout) | |
2281 | { | |
2282 | int datagrams; | |
2283 | struct timespec timeout_sys; | |
2284 | ||
2285 | if (flags & MSG_CMSG_COMPAT) | |
2286 | return -EINVAL; | |
2287 | ||
2288 | if (!timeout) | |
2289 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2290 | ||
2291 | if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) | |
2292 | return -EFAULT; | |
2293 | ||
2294 | datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
2295 | ||
2296 | if (datagrams > 0 && | |
2297 | copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) | |
2298 | datagrams = -EFAULT; | |
2299 | ||
2300 | return datagrams; | |
2301 | } | |
2302 | ||
2303 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
2304 | /* Argument list sizes for sys_socketcall */ | |
2305 | #define AL(x) ((x) * sizeof(unsigned long)) | |
2306 | static const unsigned char nargs[21] = { | |
2307 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), | |
2308 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2309 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
2310 | AL(4), AL(5), AL(4) | |
2311 | }; | |
2312 | ||
2313 | #undef AL | |
2314 | ||
2315 | /* | |
2316 | * System call vectors. | |
2317 | * | |
2318 | * Argument checking cleaned up. Saved 20% in size. | |
2319 | * This function doesn't need to set the kernel lock because | |
2320 | * it is set by the callees. | |
2321 | */ | |
2322 | ||
2323 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) | |
2324 | { | |
2325 | unsigned long a[AUDITSC_ARGS]; | |
2326 | unsigned long a0, a1; | |
2327 | int err; | |
2328 | unsigned int len; | |
2329 | ||
2330 | if (call < 1 || call > SYS_SENDMMSG) | |
2331 | return -EINVAL; | |
2332 | ||
2333 | len = nargs[call]; | |
2334 | if (len > sizeof(a)) | |
2335 | return -EINVAL; | |
2336 | ||
2337 | /* copy_from_user should be SMP safe. */ | |
2338 | if (copy_from_user(a, args, len)) | |
2339 | return -EFAULT; | |
2340 | ||
2341 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); | |
2342 | if (err) | |
2343 | return err; | |
2344 | ||
2345 | a0 = a[0]; | |
2346 | a1 = a[1]; | |
2347 | ||
2348 | switch (call) { | |
2349 | case SYS_SOCKET: | |
2350 | err = sys_socket(a0, a1, a[2]); | |
2351 | break; | |
2352 | case SYS_BIND: | |
2353 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2354 | break; | |
2355 | case SYS_CONNECT: | |
2356 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2357 | break; | |
2358 | case SYS_LISTEN: | |
2359 | err = sys_listen(a0, a1); | |
2360 | break; | |
2361 | case SYS_ACCEPT: | |
2362 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2363 | (int __user *)a[2], 0); | |
2364 | break; | |
2365 | case SYS_GETSOCKNAME: | |
2366 | err = | |
2367 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2368 | (int __user *)a[2]); | |
2369 | break; | |
2370 | case SYS_GETPEERNAME: | |
2371 | err = | |
2372 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2373 | (int __user *)a[2]); | |
2374 | break; | |
2375 | case SYS_SOCKETPAIR: | |
2376 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2377 | break; | |
2378 | case SYS_SEND: | |
2379 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2380 | break; | |
2381 | case SYS_SENDTO: | |
2382 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2383 | (struct sockaddr __user *)a[4], a[5]); | |
2384 | break; | |
2385 | case SYS_RECV: | |
2386 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2387 | break; | |
2388 | case SYS_RECVFROM: | |
2389 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2390 | (struct sockaddr __user *)a[4], | |
2391 | (int __user *)a[5]); | |
2392 | break; | |
2393 | case SYS_SHUTDOWN: | |
2394 | err = sys_shutdown(a0, a1); | |
2395 | break; | |
2396 | case SYS_SETSOCKOPT: | |
2397 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2398 | break; | |
2399 | case SYS_GETSOCKOPT: | |
2400 | err = | |
2401 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2402 | (int __user *)a[4]); | |
2403 | break; | |
2404 | case SYS_SENDMSG: | |
2405 | err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]); | |
2406 | break; | |
2407 | case SYS_SENDMMSG: | |
2408 | err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); | |
2409 | break; | |
2410 | case SYS_RECVMSG: | |
2411 | err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]); | |
2412 | break; | |
2413 | case SYS_RECVMMSG: | |
2414 | err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], | |
2415 | (struct timespec __user *)a[4]); | |
2416 | break; | |
2417 | case SYS_ACCEPT4: | |
2418 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2419 | (int __user *)a[2], a[3]); | |
2420 | break; | |
2421 | default: | |
2422 | err = -EINVAL; | |
2423 | break; | |
2424 | } | |
2425 | return err; | |
2426 | } | |
2427 | ||
2428 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ | |
2429 | ||
2430 | /** | |
2431 | * sock_register - add a socket protocol handler | |
2432 | * @ops: description of protocol | |
2433 | * | |
2434 | * This function is called by a protocol handler that wants to | |
2435 | * advertise its address family, and have it linked into the | |
2436 | * socket interface. The value ops->family corresponds to the | |
2437 | * socket system call protocol family. | |
2438 | */ | |
2439 | int sock_register(const struct net_proto_family *ops) | |
2440 | { | |
2441 | int err; | |
2442 | ||
2443 | if (ops->family >= NPROTO) { | |
2444 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); | |
2445 | return -ENOBUFS; | |
2446 | } | |
2447 | ||
2448 | spin_lock(&net_family_lock); | |
2449 | if (rcu_dereference_protected(net_families[ops->family], | |
2450 | lockdep_is_held(&net_family_lock))) | |
2451 | err = -EEXIST; | |
2452 | else { | |
2453 | rcu_assign_pointer(net_families[ops->family], ops); | |
2454 | err = 0; | |
2455 | } | |
2456 | spin_unlock(&net_family_lock); | |
2457 | ||
2458 | pr_info("NET: Registered protocol family %d\n", ops->family); | |
2459 | return err; | |
2460 | } | |
2461 | EXPORT_SYMBOL(sock_register); | |
2462 | ||
2463 | /** | |
2464 | * sock_unregister - remove a protocol handler | |
2465 | * @family: protocol family to remove | |
2466 | * | |
2467 | * This function is called by a protocol handler that wants to | |
2468 | * remove its address family, and have it unlinked from the | |
2469 | * new socket creation. | |
2470 | * | |
2471 | * If protocol handler is a module, then it can use module reference | |
2472 | * counts to protect against new references. If protocol handler is not | |
2473 | * a module then it needs to provide its own protection in | |
2474 | * the ops->create routine. | |
2475 | */ | |
2476 | void sock_unregister(int family) | |
2477 | { | |
2478 | BUG_ON(family < 0 || family >= NPROTO); | |
2479 | ||
2480 | spin_lock(&net_family_lock); | |
2481 | RCU_INIT_POINTER(net_families[family], NULL); | |
2482 | spin_unlock(&net_family_lock); | |
2483 | ||
2484 | synchronize_rcu(); | |
2485 | ||
2486 | pr_info("NET: Unregistered protocol family %d\n", family); | |
2487 | } | |
2488 | EXPORT_SYMBOL(sock_unregister); | |
2489 | ||
2490 | static int __init sock_init(void) | |
2491 | { | |
2492 | int err; | |
2493 | /* | |
2494 | * Initialize the network sysctl infrastructure. | |
2495 | */ | |
2496 | err = net_sysctl_init(); | |
2497 | if (err) | |
2498 | goto out; | |
2499 | ||
2500 | /* | |
2501 | * Initialize skbuff SLAB cache | |
2502 | */ | |
2503 | skb_init(); | |
2504 | ||
2505 | /* | |
2506 | * Initialize the protocols module. | |
2507 | */ | |
2508 | ||
2509 | init_inodecache(); | |
2510 | ||
2511 | err = register_filesystem(&sock_fs_type); | |
2512 | if (err) | |
2513 | goto out_fs; | |
2514 | sock_mnt = kern_mount(&sock_fs_type); | |
2515 | if (IS_ERR(sock_mnt)) { | |
2516 | err = PTR_ERR(sock_mnt); | |
2517 | goto out_mount; | |
2518 | } | |
2519 | ||
2520 | /* The real protocol initialization is performed in later initcalls. | |
2521 | */ | |
2522 | ||
2523 | #ifdef CONFIG_NETFILTER | |
2524 | err = netfilter_init(); | |
2525 | if (err) | |
2526 | goto out; | |
2527 | #endif | |
2528 | ||
2529 | ptp_classifier_init(); | |
2530 | ||
2531 | out: | |
2532 | return err; | |
2533 | ||
2534 | out_mount: | |
2535 | unregister_filesystem(&sock_fs_type); | |
2536 | out_fs: | |
2537 | goto out; | |
2538 | } | |
2539 | ||
2540 | core_initcall(sock_init); /* early initcall */ | |
2541 | ||
2542 | #ifdef CONFIG_PROC_FS | |
2543 | void socket_seq_show(struct seq_file *seq) | |
2544 | { | |
2545 | int cpu; | |
2546 | int counter = 0; | |
2547 | ||
2548 | for_each_possible_cpu(cpu) | |
2549 | counter += per_cpu(sockets_in_use, cpu); | |
2550 | ||
2551 | /* It can be negative, by the way. 8) */ | |
2552 | if (counter < 0) | |
2553 | counter = 0; | |
2554 | ||
2555 | seq_printf(seq, "sockets: used %d\n", counter); | |
2556 | } | |
2557 | #endif /* CONFIG_PROC_FS */ | |
2558 | ||
2559 | #ifdef CONFIG_COMPAT | |
2560 | static int do_siocgstamp(struct net *net, struct socket *sock, | |
2561 | unsigned int cmd, void __user *up) | |
2562 | { | |
2563 | mm_segment_t old_fs = get_fs(); | |
2564 | struct timeval ktv; | |
2565 | int err; | |
2566 | ||
2567 | set_fs(KERNEL_DS); | |
2568 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); | |
2569 | set_fs(old_fs); | |
2570 | if (!err) | |
2571 | err = compat_put_timeval(&ktv, up); | |
2572 | ||
2573 | return err; | |
2574 | } | |
2575 | ||
2576 | static int do_siocgstampns(struct net *net, struct socket *sock, | |
2577 | unsigned int cmd, void __user *up) | |
2578 | { | |
2579 | mm_segment_t old_fs = get_fs(); | |
2580 | struct timespec kts; | |
2581 | int err; | |
2582 | ||
2583 | set_fs(KERNEL_DS); | |
2584 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); | |
2585 | set_fs(old_fs); | |
2586 | if (!err) | |
2587 | err = compat_put_timespec(&kts, up); | |
2588 | ||
2589 | return err; | |
2590 | } | |
2591 | ||
2592 | static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) | |
2593 | { | |
2594 | struct ifreq __user *uifr; | |
2595 | int err; | |
2596 | ||
2597 | uifr = compat_alloc_user_space(sizeof(struct ifreq)); | |
2598 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) | |
2599 | return -EFAULT; | |
2600 | ||
2601 | err = dev_ioctl(net, SIOCGIFNAME, uifr); | |
2602 | if (err) | |
2603 | return err; | |
2604 | ||
2605 | if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) | |
2606 | return -EFAULT; | |
2607 | ||
2608 | return 0; | |
2609 | } | |
2610 | ||
2611 | static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) | |
2612 | { | |
2613 | struct compat_ifconf ifc32; | |
2614 | struct ifconf ifc; | |
2615 | struct ifconf __user *uifc; | |
2616 | struct compat_ifreq __user *ifr32; | |
2617 | struct ifreq __user *ifr; | |
2618 | unsigned int i, j; | |
2619 | int err; | |
2620 | ||
2621 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) | |
2622 | return -EFAULT; | |
2623 | ||
2624 | memset(&ifc, 0, sizeof(ifc)); | |
2625 | if (ifc32.ifcbuf == 0) { | |
2626 | ifc32.ifc_len = 0; | |
2627 | ifc.ifc_len = 0; | |
2628 | ifc.ifc_req = NULL; | |
2629 | uifc = compat_alloc_user_space(sizeof(struct ifconf)); | |
2630 | } else { | |
2631 | size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * | |
2632 | sizeof(struct ifreq); | |
2633 | uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); | |
2634 | ifc.ifc_len = len; | |
2635 | ifr = ifc.ifc_req = (void __user *)(uifc + 1); | |
2636 | ifr32 = compat_ptr(ifc32.ifcbuf); | |
2637 | for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { | |
2638 | if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) | |
2639 | return -EFAULT; | |
2640 | ifr++; | |
2641 | ifr32++; | |
2642 | } | |
2643 | } | |
2644 | if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) | |
2645 | return -EFAULT; | |
2646 | ||
2647 | err = dev_ioctl(net, SIOCGIFCONF, uifc); | |
2648 | if (err) | |
2649 | return err; | |
2650 | ||
2651 | if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) | |
2652 | return -EFAULT; | |
2653 | ||
2654 | ifr = ifc.ifc_req; | |
2655 | ifr32 = compat_ptr(ifc32.ifcbuf); | |
2656 | for (i = 0, j = 0; | |
2657 | i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; | |
2658 | i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { | |
2659 | if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) | |
2660 | return -EFAULT; | |
2661 | ifr32++; | |
2662 | ifr++; | |
2663 | } | |
2664 | ||
2665 | if (ifc32.ifcbuf == 0) { | |
2666 | /* Translate from 64-bit structure multiple to | |
2667 | * a 32-bit one. | |
2668 | */ | |
2669 | i = ifc.ifc_len; | |
2670 | i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); | |
2671 | ifc32.ifc_len = i; | |
2672 | } else { | |
2673 | ifc32.ifc_len = i; | |
2674 | } | |
2675 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) | |
2676 | return -EFAULT; | |
2677 | ||
2678 | return 0; | |
2679 | } | |
2680 | ||
2681 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) | |
2682 | { | |
2683 | struct compat_ethtool_rxnfc __user *compat_rxnfc; | |
2684 | bool convert_in = false, convert_out = false; | |
2685 | size_t buf_size = ALIGN(sizeof(struct ifreq), 8); | |
2686 | struct ethtool_rxnfc __user *rxnfc; | |
2687 | struct ifreq __user *ifr; | |
2688 | u32 rule_cnt = 0, actual_rule_cnt; | |
2689 | u32 ethcmd; | |
2690 | u32 data; | |
2691 | int ret; | |
2692 | ||
2693 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) | |
2694 | return -EFAULT; | |
2695 | ||
2696 | compat_rxnfc = compat_ptr(data); | |
2697 | ||
2698 | if (get_user(ethcmd, &compat_rxnfc->cmd)) | |
2699 | return -EFAULT; | |
2700 | ||
2701 | /* Most ethtool structures are defined without padding. | |
2702 | * Unfortunately struct ethtool_rxnfc is an exception. | |
2703 | */ | |
2704 | switch (ethcmd) { | |
2705 | default: | |
2706 | break; | |
2707 | case ETHTOOL_GRXCLSRLALL: | |
2708 | /* Buffer size is variable */ | |
2709 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) | |
2710 | return -EFAULT; | |
2711 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) | |
2712 | return -ENOMEM; | |
2713 | buf_size += rule_cnt * sizeof(u32); | |
2714 | /* fall through */ | |
2715 | case ETHTOOL_GRXRINGS: | |
2716 | case ETHTOOL_GRXCLSRLCNT: | |
2717 | case ETHTOOL_GRXCLSRULE: | |
2718 | case ETHTOOL_SRXCLSRLINS: | |
2719 | convert_out = true; | |
2720 | /* fall through */ | |
2721 | case ETHTOOL_SRXCLSRLDEL: | |
2722 | buf_size += sizeof(struct ethtool_rxnfc); | |
2723 | convert_in = true; | |
2724 | break; | |
2725 | } | |
2726 | ||
2727 | ifr = compat_alloc_user_space(buf_size); | |
2728 | rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); | |
2729 | ||
2730 | if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) | |
2731 | return -EFAULT; | |
2732 | ||
2733 | if (put_user(convert_in ? rxnfc : compat_ptr(data), | |
2734 | &ifr->ifr_ifru.ifru_data)) | |
2735 | return -EFAULT; | |
2736 | ||
2737 | if (convert_in) { | |
2738 | /* We expect there to be holes between fs.m_ext and | |
2739 | * fs.ring_cookie and at the end of fs, but nowhere else. | |
2740 | */ | |
2741 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + | |
2742 | sizeof(compat_rxnfc->fs.m_ext) != | |
2743 | offsetof(struct ethtool_rxnfc, fs.m_ext) + | |
2744 | sizeof(rxnfc->fs.m_ext)); | |
2745 | BUILD_BUG_ON( | |
2746 | offsetof(struct compat_ethtool_rxnfc, fs.location) - | |
2747 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != | |
2748 | offsetof(struct ethtool_rxnfc, fs.location) - | |
2749 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); | |
2750 | ||
2751 | if (copy_in_user(rxnfc, compat_rxnfc, | |
2752 | (void __user *)(&rxnfc->fs.m_ext + 1) - | |
2753 | (void __user *)rxnfc) || | |
2754 | copy_in_user(&rxnfc->fs.ring_cookie, | |
2755 | &compat_rxnfc->fs.ring_cookie, | |
2756 | (void __user *)(&rxnfc->fs.location + 1) - | |
2757 | (void __user *)&rxnfc->fs.ring_cookie) || | |
2758 | copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, | |
2759 | sizeof(rxnfc->rule_cnt))) | |
2760 | return -EFAULT; | |
2761 | } | |
2762 | ||
2763 | ret = dev_ioctl(net, SIOCETHTOOL, ifr); | |
2764 | if (ret) | |
2765 | return ret; | |
2766 | ||
2767 | if (convert_out) { | |
2768 | if (copy_in_user(compat_rxnfc, rxnfc, | |
2769 | (const void __user *)(&rxnfc->fs.m_ext + 1) - | |
2770 | (const void __user *)rxnfc) || | |
2771 | copy_in_user(&compat_rxnfc->fs.ring_cookie, | |
2772 | &rxnfc->fs.ring_cookie, | |
2773 | (const void __user *)(&rxnfc->fs.location + 1) - | |
2774 | (const void __user *)&rxnfc->fs.ring_cookie) || | |
2775 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, | |
2776 | sizeof(rxnfc->rule_cnt))) | |
2777 | return -EFAULT; | |
2778 | ||
2779 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
2780 | /* As an optimisation, we only copy the actual | |
2781 | * number of rules that the underlying | |
2782 | * function returned. Since Mallory might | |
2783 | * change the rule count in user memory, we | |
2784 | * check that it is less than the rule count | |
2785 | * originally given (as the user buffer size), | |
2786 | * which has been range-checked. | |
2787 | */ | |
2788 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) | |
2789 | return -EFAULT; | |
2790 | if (actual_rule_cnt < rule_cnt) | |
2791 | rule_cnt = actual_rule_cnt; | |
2792 | if (copy_in_user(&compat_rxnfc->rule_locs[0], | |
2793 | &rxnfc->rule_locs[0], | |
2794 | rule_cnt * sizeof(u32))) | |
2795 | return -EFAULT; | |
2796 | } | |
2797 | } | |
2798 | ||
2799 | return 0; | |
2800 | } | |
2801 | ||
2802 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) | |
2803 | { | |
2804 | void __user *uptr; | |
2805 | compat_uptr_t uptr32; | |
2806 | struct ifreq __user *uifr; | |
2807 | ||
2808 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
2809 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) | |
2810 | return -EFAULT; | |
2811 | ||
2812 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
2813 | return -EFAULT; | |
2814 | ||
2815 | uptr = compat_ptr(uptr32); | |
2816 | ||
2817 | if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) | |
2818 | return -EFAULT; | |
2819 | ||
2820 | return dev_ioctl(net, SIOCWANDEV, uifr); | |
2821 | } | |
2822 | ||
2823 | static int bond_ioctl(struct net *net, unsigned int cmd, | |
2824 | struct compat_ifreq __user *ifr32) | |
2825 | { | |
2826 | struct ifreq kifr; | |
2827 | mm_segment_t old_fs; | |
2828 | int err; | |
2829 | ||
2830 | switch (cmd) { | |
2831 | case SIOCBONDENSLAVE: | |
2832 | case SIOCBONDRELEASE: | |
2833 | case SIOCBONDSETHWADDR: | |
2834 | case SIOCBONDCHANGEACTIVE: | |
2835 | if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) | |
2836 | return -EFAULT; | |
2837 | ||
2838 | old_fs = get_fs(); | |
2839 | set_fs(KERNEL_DS); | |
2840 | err = dev_ioctl(net, cmd, | |
2841 | (struct ifreq __user __force *) &kifr); | |
2842 | set_fs(old_fs); | |
2843 | ||
2844 | return err; | |
2845 | default: | |
2846 | return -ENOIOCTLCMD; | |
2847 | } | |
2848 | } | |
2849 | ||
2850 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ | |
2851 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
2852 | struct compat_ifreq __user *u_ifreq32) | |
2853 | { | |
2854 | struct ifreq __user *u_ifreq64; | |
2855 | char tmp_buf[IFNAMSIZ]; | |
2856 | void __user *data64; | |
2857 | u32 data32; | |
2858 | ||
2859 | if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), | |
2860 | IFNAMSIZ)) | |
2861 | return -EFAULT; | |
2862 | if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) | |
2863 | return -EFAULT; | |
2864 | data64 = compat_ptr(data32); | |
2865 | ||
2866 | u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); | |
2867 | ||
2868 | if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], | |
2869 | IFNAMSIZ)) | |
2870 | return -EFAULT; | |
2871 | if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) | |
2872 | return -EFAULT; | |
2873 | ||
2874 | return dev_ioctl(net, cmd, u_ifreq64); | |
2875 | } | |
2876 | ||
2877 | static int dev_ifsioc(struct net *net, struct socket *sock, | |
2878 | unsigned int cmd, struct compat_ifreq __user *uifr32) | |
2879 | { | |
2880 | struct ifreq __user *uifr; | |
2881 | int err; | |
2882 | ||
2883 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
2884 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) | |
2885 | return -EFAULT; | |
2886 | ||
2887 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); | |
2888 | ||
2889 | if (!err) { | |
2890 | switch (cmd) { | |
2891 | case SIOCGIFFLAGS: | |
2892 | case SIOCGIFMETRIC: | |
2893 | case SIOCGIFMTU: | |
2894 | case SIOCGIFMEM: | |
2895 | case SIOCGIFHWADDR: | |
2896 | case SIOCGIFINDEX: | |
2897 | case SIOCGIFADDR: | |
2898 | case SIOCGIFBRDADDR: | |
2899 | case SIOCGIFDSTADDR: | |
2900 | case SIOCGIFNETMASK: | |
2901 | case SIOCGIFPFLAGS: | |
2902 | case SIOCGIFTXQLEN: | |
2903 | case SIOCGMIIPHY: | |
2904 | case SIOCGMIIREG: | |
2905 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) | |
2906 | err = -EFAULT; | |
2907 | break; | |
2908 | } | |
2909 | } | |
2910 | return err; | |
2911 | } | |
2912 | ||
2913 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, | |
2914 | struct compat_ifreq __user *uifr32) | |
2915 | { | |
2916 | struct ifreq ifr; | |
2917 | struct compat_ifmap __user *uifmap32; | |
2918 | mm_segment_t old_fs; | |
2919 | int err; | |
2920 | ||
2921 | uifmap32 = &uifr32->ifr_ifru.ifru_map; | |
2922 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); | |
2923 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); | |
2924 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
2925 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
2926 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); | |
2927 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); | |
2928 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); | |
2929 | if (err) | |
2930 | return -EFAULT; | |
2931 | ||
2932 | old_fs = get_fs(); | |
2933 | set_fs(KERNEL_DS); | |
2934 | err = dev_ioctl(net, cmd, (void __user __force *)&ifr); | |
2935 | set_fs(old_fs); | |
2936 | ||
2937 | if (cmd == SIOCGIFMAP && !err) { | |
2938 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); | |
2939 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); | |
2940 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
2941 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
2942 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); | |
2943 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); | |
2944 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); | |
2945 | if (err) | |
2946 | err = -EFAULT; | |
2947 | } | |
2948 | return err; | |
2949 | } | |
2950 | ||
2951 | struct rtentry32 { | |
2952 | u32 rt_pad1; | |
2953 | struct sockaddr rt_dst; /* target address */ | |
2954 | struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ | |
2955 | struct sockaddr rt_genmask; /* target network mask (IP) */ | |
2956 | unsigned short rt_flags; | |
2957 | short rt_pad2; | |
2958 | u32 rt_pad3; | |
2959 | unsigned char rt_tos; | |
2960 | unsigned char rt_class; | |
2961 | short rt_pad4; | |
2962 | short rt_metric; /* +1 for binary compatibility! */ | |
2963 | /* char * */ u32 rt_dev; /* forcing the device at add */ | |
2964 | u32 rt_mtu; /* per route MTU/Window */ | |
2965 | u32 rt_window; /* Window clamping */ | |
2966 | unsigned short rt_irtt; /* Initial RTT */ | |
2967 | }; | |
2968 | ||
2969 | struct in6_rtmsg32 { | |
2970 | struct in6_addr rtmsg_dst; | |
2971 | struct in6_addr rtmsg_src; | |
2972 | struct in6_addr rtmsg_gateway; | |
2973 | u32 rtmsg_type; | |
2974 | u16 rtmsg_dst_len; | |
2975 | u16 rtmsg_src_len; | |
2976 | u32 rtmsg_metric; | |
2977 | u32 rtmsg_info; | |
2978 | u32 rtmsg_flags; | |
2979 | s32 rtmsg_ifindex; | |
2980 | }; | |
2981 | ||
2982 | static int routing_ioctl(struct net *net, struct socket *sock, | |
2983 | unsigned int cmd, void __user *argp) | |
2984 | { | |
2985 | int ret; | |
2986 | void *r = NULL; | |
2987 | struct in6_rtmsg r6; | |
2988 | struct rtentry r4; | |
2989 | char devname[16]; | |
2990 | u32 rtdev; | |
2991 | mm_segment_t old_fs = get_fs(); | |
2992 | ||
2993 | if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ | |
2994 | struct in6_rtmsg32 __user *ur6 = argp; | |
2995 | ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), | |
2996 | 3 * sizeof(struct in6_addr)); | |
2997 | ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); | |
2998 | ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); | |
2999 | ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); | |
3000 | ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); | |
3001 | ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); | |
3002 | ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); | |
3003 | ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); | |
3004 | ||
3005 | r = (void *) &r6; | |
3006 | } else { /* ipv4 */ | |
3007 | struct rtentry32 __user *ur4 = argp; | |
3008 | ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), | |
3009 | 3 * sizeof(struct sockaddr)); | |
3010 | ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); | |
3011 | ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); | |
3012 | ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); | |
3013 | ret |= get_user(r4.rt_window, &(ur4->rt_window)); | |
3014 | ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); | |
3015 | ret |= get_user(rtdev, &(ur4->rt_dev)); | |
3016 | if (rtdev) { | |
3017 | ret |= copy_from_user(devname, compat_ptr(rtdev), 15); | |
3018 | r4.rt_dev = (char __user __force *)devname; | |
3019 | devname[15] = 0; | |
3020 | } else | |
3021 | r4.rt_dev = NULL; | |
3022 | ||
3023 | r = (void *) &r4; | |
3024 | } | |
3025 | ||
3026 | if (ret) { | |
3027 | ret = -EFAULT; | |
3028 | goto out; | |
3029 | } | |
3030 | ||
3031 | set_fs(KERNEL_DS); | |
3032 | ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); | |
3033 | set_fs(old_fs); | |
3034 | ||
3035 | out: | |
3036 | return ret; | |
3037 | } | |
3038 | ||
3039 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE | |
3040 | * for some operations; this forces use of the newer bridge-utils that | |
3041 | * use compatible ioctls | |
3042 | */ | |
3043 | static int old_bridge_ioctl(compat_ulong_t __user *argp) | |
3044 | { | |
3045 | compat_ulong_t tmp; | |
3046 | ||
3047 | if (get_user(tmp, argp)) | |
3048 | return -EFAULT; | |
3049 | if (tmp == BRCTL_GET_VERSION) | |
3050 | return BRCTL_VERSION + 1; | |
3051 | return -EINVAL; | |
3052 | } | |
3053 | ||
3054 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, | |
3055 | unsigned int cmd, unsigned long arg) | |
3056 | { | |
3057 | void __user *argp = compat_ptr(arg); | |
3058 | struct sock *sk = sock->sk; | |
3059 | struct net *net = sock_net(sk); | |
3060 | ||
3061 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) | |
3062 | return compat_ifr_data_ioctl(net, cmd, argp); | |
3063 | ||
3064 | switch (cmd) { | |
3065 | case SIOCSIFBR: | |
3066 | case SIOCGIFBR: | |
3067 | return old_bridge_ioctl(argp); | |
3068 | case SIOCGIFNAME: | |
3069 | return dev_ifname32(net, argp); | |
3070 | case SIOCGIFCONF: | |
3071 | return dev_ifconf(net, argp); | |
3072 | case SIOCETHTOOL: | |
3073 | return ethtool_ioctl(net, argp); | |
3074 | case SIOCWANDEV: | |
3075 | return compat_siocwandev(net, argp); | |
3076 | case SIOCGIFMAP: | |
3077 | case SIOCSIFMAP: | |
3078 | return compat_sioc_ifmap(net, cmd, argp); | |
3079 | case SIOCBONDENSLAVE: | |
3080 | case SIOCBONDRELEASE: | |
3081 | case SIOCBONDSETHWADDR: | |
3082 | case SIOCBONDCHANGEACTIVE: | |
3083 | return bond_ioctl(net, cmd, argp); | |
3084 | case SIOCADDRT: | |
3085 | case SIOCDELRT: | |
3086 | return routing_ioctl(net, sock, cmd, argp); | |
3087 | case SIOCGSTAMP: | |
3088 | return do_siocgstamp(net, sock, cmd, argp); | |
3089 | case SIOCGSTAMPNS: | |
3090 | return do_siocgstampns(net, sock, cmd, argp); | |
3091 | case SIOCBONDSLAVEINFOQUERY: | |
3092 | case SIOCBONDINFOQUERY: | |
3093 | case SIOCSHWTSTAMP: | |
3094 | case SIOCGHWTSTAMP: | |
3095 | return compat_ifr_data_ioctl(net, cmd, argp); | |
3096 | ||
3097 | case FIOSETOWN: | |
3098 | case SIOCSPGRP: | |
3099 | case FIOGETOWN: | |
3100 | case SIOCGPGRP: | |
3101 | case SIOCBRADDBR: | |
3102 | case SIOCBRDELBR: | |
3103 | case SIOCGIFVLAN: | |
3104 | case SIOCSIFVLAN: | |
3105 | case SIOCADDDLCI: | |
3106 | case SIOCDELDLCI: | |
3107 | return sock_ioctl(file, cmd, arg); | |
3108 | ||
3109 | case SIOCGIFFLAGS: | |
3110 | case SIOCSIFFLAGS: | |
3111 | case SIOCGIFMETRIC: | |
3112 | case SIOCSIFMETRIC: | |
3113 | case SIOCGIFMTU: | |
3114 | case SIOCSIFMTU: | |
3115 | case SIOCGIFMEM: | |
3116 | case SIOCSIFMEM: | |
3117 | case SIOCGIFHWADDR: | |
3118 | case SIOCSIFHWADDR: | |
3119 | case SIOCADDMULTI: | |
3120 | case SIOCDELMULTI: | |
3121 | case SIOCGIFINDEX: | |
3122 | case SIOCGIFADDR: | |
3123 | case SIOCSIFADDR: | |
3124 | case SIOCSIFHWBROADCAST: | |
3125 | case SIOCDIFADDR: | |
3126 | case SIOCGIFBRDADDR: | |
3127 | case SIOCSIFBRDADDR: | |
3128 | case SIOCGIFDSTADDR: | |
3129 | case SIOCSIFDSTADDR: | |
3130 | case SIOCGIFNETMASK: | |
3131 | case SIOCSIFNETMASK: | |
3132 | case SIOCSIFPFLAGS: | |
3133 | case SIOCGIFPFLAGS: | |
3134 | case SIOCGIFTXQLEN: | |
3135 | case SIOCSIFTXQLEN: | |
3136 | case SIOCBRADDIF: | |
3137 | case SIOCBRDELIF: | |
3138 | case SIOCSIFNAME: | |
3139 | case SIOCGMIIPHY: | |
3140 | case SIOCGMIIREG: | |
3141 | case SIOCSMIIREG: | |
3142 | return dev_ifsioc(net, sock, cmd, argp); | |
3143 | ||
3144 | case SIOCSARP: | |
3145 | case SIOCGARP: | |
3146 | case SIOCDARP: | |
3147 | case SIOCATMARK: | |
3148 | return sock_do_ioctl(net, sock, cmd, arg); | |
3149 | } | |
3150 | ||
3151 | return -ENOIOCTLCMD; | |
3152 | } | |
3153 | ||
3154 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, | |
3155 | unsigned long arg) | |
3156 | { | |
3157 | struct socket *sock = file->private_data; | |
3158 | int ret = -ENOIOCTLCMD; | |
3159 | struct sock *sk; | |
3160 | struct net *net; | |
3161 | ||
3162 | sk = sock->sk; | |
3163 | net = sock_net(sk); | |
3164 | ||
3165 | if (sock->ops->compat_ioctl) | |
3166 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3167 | ||
3168 | if (ret == -ENOIOCTLCMD && | |
3169 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3170 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3171 | ||
3172 | if (ret == -ENOIOCTLCMD) | |
3173 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3174 | ||
3175 | return ret; | |
3176 | } | |
3177 | #endif | |
3178 | ||
3179 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) | |
3180 | { | |
3181 | return sock->ops->bind(sock, addr, addrlen); | |
3182 | } | |
3183 | EXPORT_SYMBOL(kernel_bind); | |
3184 | ||
3185 | int kernel_listen(struct socket *sock, int backlog) | |
3186 | { | |
3187 | return sock->ops->listen(sock, backlog); | |
3188 | } | |
3189 | EXPORT_SYMBOL(kernel_listen); | |
3190 | ||
3191 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
3192 | { | |
3193 | struct sock *sk = sock->sk; | |
3194 | int err; | |
3195 | ||
3196 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3197 | newsock); | |
3198 | if (err < 0) | |
3199 | goto done; | |
3200 | ||
3201 | err = sock->ops->accept(sock, *newsock, flags); | |
3202 | if (err < 0) { | |
3203 | sock_release(*newsock); | |
3204 | *newsock = NULL; | |
3205 | goto done; | |
3206 | } | |
3207 | ||
3208 | (*newsock)->ops = sock->ops; | |
3209 | __module_get((*newsock)->ops->owner); | |
3210 | ||
3211 | done: | |
3212 | return err; | |
3213 | } | |
3214 | EXPORT_SYMBOL(kernel_accept); | |
3215 | ||
3216 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
3217 | int flags) | |
3218 | { | |
3219 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3220 | } | |
3221 | EXPORT_SYMBOL(kernel_connect); | |
3222 | ||
3223 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
3224 | int *addrlen) | |
3225 | { | |
3226 | return sock->ops->getname(sock, addr, addrlen, 0); | |
3227 | } | |
3228 | EXPORT_SYMBOL(kernel_getsockname); | |
3229 | ||
3230 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
3231 | int *addrlen) | |
3232 | { | |
3233 | return sock->ops->getname(sock, addr, addrlen, 1); | |
3234 | } | |
3235 | EXPORT_SYMBOL(kernel_getpeername); | |
3236 | ||
3237 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
3238 | char *optval, int *optlen) | |
3239 | { | |
3240 | mm_segment_t oldfs = get_fs(); | |
3241 | char __user *uoptval; | |
3242 | int __user *uoptlen; | |
3243 | int err; | |
3244 | ||
3245 | uoptval = (char __user __force *) optval; | |
3246 | uoptlen = (int __user __force *) optlen; | |
3247 | ||
3248 | set_fs(KERNEL_DS); | |
3249 | if (level == SOL_SOCKET) | |
3250 | err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); | |
3251 | else | |
3252 | err = sock->ops->getsockopt(sock, level, optname, uoptval, | |
3253 | uoptlen); | |
3254 | set_fs(oldfs); | |
3255 | return err; | |
3256 | } | |
3257 | EXPORT_SYMBOL(kernel_getsockopt); | |
3258 | ||
3259 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
3260 | char *optval, unsigned int optlen) | |
3261 | { | |
3262 | mm_segment_t oldfs = get_fs(); | |
3263 | char __user *uoptval; | |
3264 | int err; | |
3265 | ||
3266 | uoptval = (char __user __force *) optval; | |
3267 | ||
3268 | set_fs(KERNEL_DS); | |
3269 | if (level == SOL_SOCKET) | |
3270 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); | |
3271 | else | |
3272 | err = sock->ops->setsockopt(sock, level, optname, uoptval, | |
3273 | optlen); | |
3274 | set_fs(oldfs); | |
3275 | return err; | |
3276 | } | |
3277 | EXPORT_SYMBOL(kernel_setsockopt); | |
3278 | ||
3279 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
3280 | size_t size, int flags) | |
3281 | { | |
3282 | if (sock->ops->sendpage) | |
3283 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
3284 | ||
3285 | return sock_no_sendpage(sock, page, offset, size, flags); | |
3286 | } | |
3287 | EXPORT_SYMBOL(kernel_sendpage); | |
3288 | ||
3289 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
3290 | { | |
3291 | mm_segment_t oldfs = get_fs(); | |
3292 | int err; | |
3293 | ||
3294 | set_fs(KERNEL_DS); | |
3295 | err = sock->ops->ioctl(sock, cmd, arg); | |
3296 | set_fs(oldfs); | |
3297 | ||
3298 | return err; | |
3299 | } | |
3300 | EXPORT_SYMBOL(kernel_sock_ioctl); | |
3301 | ||
3302 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) | |
3303 | { | |
3304 | return sock->ops->shutdown(sock, how); | |
3305 | } | |
3306 | EXPORT_SYMBOL(kernel_sock_shutdown); |