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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 <linux/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_iter = sock_read_iter, | |
144 | .write_iter = sock_write_iter, | |
145 | .poll = sock_poll, | |
146 | .unlocked_ioctl = sock_ioctl, | |
147 | #ifdef CONFIG_COMPAT | |
148 | .compat_ioctl = compat_sock_ioctl, | |
149 | #endif | |
150 | .mmap = sock_mmap, | |
151 | .release = sock_close, | |
152 | .fasync = sock_fasync, | |
153 | .sendpage = sock_sendpage, | |
154 | .splice_write = generic_splice_sendpage, | |
155 | .splice_read = sock_splice_read, | |
156 | }; | |
157 | ||
158 | /* | |
159 | * The protocol list. Each protocol is registered in here. | |
160 | */ | |
161 | ||
162 | static DEFINE_SPINLOCK(net_family_lock); | |
163 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; | |
164 | ||
165 | /* | |
166 | * Statistics counters of the socket lists | |
167 | */ | |
168 | ||
169 | static DEFINE_PER_CPU(int, sockets_in_use); | |
170 | ||
171 | /* | |
172 | * Support routines. | |
173 | * Move socket addresses back and forth across the kernel/user | |
174 | * divide and look after the messy bits. | |
175 | */ | |
176 | ||
177 | /** | |
178 | * move_addr_to_kernel - copy a socket address into kernel space | |
179 | * @uaddr: Address in user space | |
180 | * @kaddr: Address in kernel space | |
181 | * @ulen: Length in user space | |
182 | * | |
183 | * The address is copied into kernel space. If the provided address is | |
184 | * too long an error code of -EINVAL is returned. If the copy gives | |
185 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
186 | */ | |
187 | ||
188 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) | |
189 | { | |
190 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) | |
191 | return -EINVAL; | |
192 | if (ulen == 0) | |
193 | return 0; | |
194 | if (copy_from_user(kaddr, uaddr, ulen)) | |
195 | return -EFAULT; | |
196 | return audit_sockaddr(ulen, kaddr); | |
197 | } | |
198 | ||
199 | /** | |
200 | * move_addr_to_user - copy an address to user space | |
201 | * @kaddr: kernel space address | |
202 | * @klen: length of address in kernel | |
203 | * @uaddr: user space address | |
204 | * @ulen: pointer to user length field | |
205 | * | |
206 | * The value pointed to by ulen on entry is the buffer length available. | |
207 | * This is overwritten with the buffer space used. -EINVAL is returned | |
208 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
209 | * is returned if either the buffer or the length field are not | |
210 | * accessible. | |
211 | * After copying the data up to the limit the user specifies, the true | |
212 | * length of the data is written over the length limit the user | |
213 | * specified. Zero is returned for a success. | |
214 | */ | |
215 | ||
216 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, | |
217 | void __user *uaddr, int __user *ulen) | |
218 | { | |
219 | int err; | |
220 | int len; | |
221 | ||
222 | BUG_ON(klen > sizeof(struct sockaddr_storage)); | |
223 | err = get_user(len, ulen); | |
224 | if (err) | |
225 | return err; | |
226 | if (len > klen) | |
227 | len = klen; | |
228 | if (len < 0) | |
229 | return -EINVAL; | |
230 | if (len) { | |
231 | if (audit_sockaddr(klen, kaddr)) | |
232 | return -ENOMEM; | |
233 | if (copy_to_user(uaddr, kaddr, len)) | |
234 | return -EFAULT; | |
235 | } | |
236 | /* | |
237 | * "fromlen shall refer to the value before truncation.." | |
238 | * 1003.1g | |
239 | */ | |
240 | return __put_user(klen, ulen); | |
241 | } | |
242 | ||
243 | static struct kmem_cache *sock_inode_cachep __read_mostly; | |
244 | ||
245 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
246 | { | |
247 | struct socket_alloc *ei; | |
248 | struct socket_wq *wq; | |
249 | ||
250 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); | |
251 | if (!ei) | |
252 | return NULL; | |
253 | wq = kmalloc(sizeof(*wq), GFP_KERNEL); | |
254 | if (!wq) { | |
255 | kmem_cache_free(sock_inode_cachep, ei); | |
256 | return NULL; | |
257 | } | |
258 | init_waitqueue_head(&wq->wait); | |
259 | wq->fasync_list = NULL; | |
260 | wq->flags = 0; | |
261 | RCU_INIT_POINTER(ei->socket.wq, wq); | |
262 | ||
263 | ei->socket.state = SS_UNCONNECTED; | |
264 | ei->socket.flags = 0; | |
265 | ei->socket.ops = NULL; | |
266 | ei->socket.sk = NULL; | |
267 | ei->socket.file = NULL; | |
268 | ||
269 | return &ei->vfs_inode; | |
270 | } | |
271 | ||
272 | static void sock_destroy_inode(struct inode *inode) | |
273 | { | |
274 | struct socket_alloc *ei; | |
275 | struct socket_wq *wq; | |
276 | ||
277 | ei = container_of(inode, struct socket_alloc, vfs_inode); | |
278 | wq = rcu_dereference_protected(ei->socket.wq, 1); | |
279 | kfree_rcu(wq, rcu); | |
280 | kmem_cache_free(sock_inode_cachep, ei); | |
281 | } | |
282 | ||
283 | static void init_once(void *foo) | |
284 | { | |
285 | struct socket_alloc *ei = (struct socket_alloc *)foo; | |
286 | ||
287 | inode_init_once(&ei->vfs_inode); | |
288 | } | |
289 | ||
290 | static int init_inodecache(void) | |
291 | { | |
292 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
293 | sizeof(struct socket_alloc), | |
294 | 0, | |
295 | (SLAB_HWCACHE_ALIGN | | |
296 | SLAB_RECLAIM_ACCOUNT | | |
297 | SLAB_MEM_SPREAD | SLAB_ACCOUNT), | |
298 | init_once); | |
299 | if (sock_inode_cachep == NULL) | |
300 | return -ENOMEM; | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static const struct super_operations sockfs_ops = { | |
305 | .alloc_inode = sock_alloc_inode, | |
306 | .destroy_inode = sock_destroy_inode, | |
307 | .statfs = simple_statfs, | |
308 | }; | |
309 | ||
310 | /* | |
311 | * sockfs_dname() is called from d_path(). | |
312 | */ | |
313 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
314 | { | |
315 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
316 | d_inode(dentry)->i_ino); | |
317 | } | |
318 | ||
319 | static const struct dentry_operations sockfs_dentry_operations = { | |
320 | .d_dname = sockfs_dname, | |
321 | }; | |
322 | ||
323 | static int sockfs_xattr_get(const struct xattr_handler *handler, | |
324 | struct dentry *dentry, struct inode *inode, | |
325 | const char *suffix, void *value, size_t size) | |
326 | { | |
327 | if (value) { | |
328 | if (dentry->d_name.len + 1 > size) | |
329 | return -ERANGE; | |
330 | memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); | |
331 | } | |
332 | return dentry->d_name.len + 1; | |
333 | } | |
334 | ||
335 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
336 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
337 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
338 | ||
339 | static const struct xattr_handler sockfs_xattr_handler = { | |
340 | .name = XATTR_NAME_SOCKPROTONAME, | |
341 | .get = sockfs_xattr_get, | |
342 | }; | |
343 | ||
344 | static int sockfs_security_xattr_set(const struct xattr_handler *handler, | |
345 | struct dentry *dentry, struct inode *inode, | |
346 | const char *suffix, const void *value, | |
347 | size_t size, int flags) | |
348 | { | |
349 | /* Handled by LSM. */ | |
350 | return -EAGAIN; | |
351 | } | |
352 | ||
353 | static const struct xattr_handler sockfs_security_xattr_handler = { | |
354 | .prefix = XATTR_SECURITY_PREFIX, | |
355 | .set = sockfs_security_xattr_set, | |
356 | }; | |
357 | ||
358 | static const struct xattr_handler *sockfs_xattr_handlers[] = { | |
359 | &sockfs_xattr_handler, | |
360 | &sockfs_security_xattr_handler, | |
361 | NULL | |
362 | }; | |
363 | ||
364 | static struct dentry *sockfs_mount(struct file_system_type *fs_type, | |
365 | int flags, const char *dev_name, void *data) | |
366 | { | |
367 | return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, | |
368 | sockfs_xattr_handlers, | |
369 | &sockfs_dentry_operations, SOCKFS_MAGIC); | |
370 | } | |
371 | ||
372 | static struct vfsmount *sock_mnt __read_mostly; | |
373 | ||
374 | static struct file_system_type sock_fs_type = { | |
375 | .name = "sockfs", | |
376 | .mount = sockfs_mount, | |
377 | .kill_sb = kill_anon_super, | |
378 | }; | |
379 | ||
380 | /* | |
381 | * Obtains the first available file descriptor and sets it up for use. | |
382 | * | |
383 | * These functions create file structures and maps them to fd space | |
384 | * of the current process. On success it returns file descriptor | |
385 | * and file struct implicitly stored in sock->file. | |
386 | * Note that another thread may close file descriptor before we return | |
387 | * from this function. We use the fact that now we do not refer | |
388 | * to socket after mapping. If one day we will need it, this | |
389 | * function will increment ref. count on file by 1. | |
390 | * | |
391 | * In any case returned fd MAY BE not valid! | |
392 | * This race condition is unavoidable | |
393 | * with shared fd spaces, we cannot solve it inside kernel, | |
394 | * but we take care of internal coherence yet. | |
395 | */ | |
396 | ||
397 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) | |
398 | { | |
399 | struct qstr name = { .name = "" }; | |
400 | struct path path; | |
401 | struct file *file; | |
402 | ||
403 | if (dname) { | |
404 | name.name = dname; | |
405 | name.len = strlen(name.name); | |
406 | } else if (sock->sk) { | |
407 | name.name = sock->sk->sk_prot_creator->name; | |
408 | name.len = strlen(name.name); | |
409 | } | |
410 | path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); | |
411 | if (unlikely(!path.dentry)) | |
412 | return ERR_PTR(-ENOMEM); | |
413 | path.mnt = mntget(sock_mnt); | |
414 | ||
415 | d_instantiate(path.dentry, SOCK_INODE(sock)); | |
416 | ||
417 | file = alloc_file(&path, FMODE_READ | FMODE_WRITE, | |
418 | &socket_file_ops); | |
419 | if (IS_ERR(file)) { | |
420 | /* drop dentry, keep inode */ | |
421 | ihold(d_inode(path.dentry)); | |
422 | path_put(&path); | |
423 | return file; | |
424 | } | |
425 | ||
426 | sock->file = file; | |
427 | file->f_flags = O_RDWR | (flags & O_NONBLOCK); | |
428 | file->private_data = sock; | |
429 | return file; | |
430 | } | |
431 | EXPORT_SYMBOL(sock_alloc_file); | |
432 | ||
433 | static int sock_map_fd(struct socket *sock, int flags) | |
434 | { | |
435 | struct file *newfile; | |
436 | int fd = get_unused_fd_flags(flags); | |
437 | if (unlikely(fd < 0)) | |
438 | return fd; | |
439 | ||
440 | newfile = sock_alloc_file(sock, flags, NULL); | |
441 | if (likely(!IS_ERR(newfile))) { | |
442 | fd_install(fd, newfile); | |
443 | return fd; | |
444 | } | |
445 | ||
446 | put_unused_fd(fd); | |
447 | return PTR_ERR(newfile); | |
448 | } | |
449 | ||
450 | struct socket *sock_from_file(struct file *file, int *err) | |
451 | { | |
452 | if (file->f_op == &socket_file_ops) | |
453 | return file->private_data; /* set in sock_map_fd */ | |
454 | ||
455 | *err = -ENOTSOCK; | |
456 | return NULL; | |
457 | } | |
458 | EXPORT_SYMBOL(sock_from_file); | |
459 | ||
460 | /** | |
461 | * sockfd_lookup - Go from a file number to its socket slot | |
462 | * @fd: file handle | |
463 | * @err: pointer to an error code return | |
464 | * | |
465 | * The file handle passed in is locked and the socket it is bound | |
466 | * too is returned. If an error occurs the err pointer is overwritten | |
467 | * with a negative errno code and NULL is returned. The function checks | |
468 | * for both invalid handles and passing a handle which is not a socket. | |
469 | * | |
470 | * On a success the socket object pointer is returned. | |
471 | */ | |
472 | ||
473 | struct socket *sockfd_lookup(int fd, int *err) | |
474 | { | |
475 | struct file *file; | |
476 | struct socket *sock; | |
477 | ||
478 | file = fget(fd); | |
479 | if (!file) { | |
480 | *err = -EBADF; | |
481 | return NULL; | |
482 | } | |
483 | ||
484 | sock = sock_from_file(file, err); | |
485 | if (!sock) | |
486 | fput(file); | |
487 | return sock; | |
488 | } | |
489 | EXPORT_SYMBOL(sockfd_lookup); | |
490 | ||
491 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) | |
492 | { | |
493 | struct fd f = fdget(fd); | |
494 | struct socket *sock; | |
495 | ||
496 | *err = -EBADF; | |
497 | if (f.file) { | |
498 | sock = sock_from_file(f.file, err); | |
499 | if (likely(sock)) { | |
500 | *fput_needed = f.flags; | |
501 | return sock; | |
502 | } | |
503 | fdput(f); | |
504 | } | |
505 | return NULL; | |
506 | } | |
507 | ||
508 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, | |
509 | size_t size) | |
510 | { | |
511 | ssize_t len; | |
512 | ssize_t used = 0; | |
513 | ||
514 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); | |
515 | if (len < 0) | |
516 | return len; | |
517 | used += len; | |
518 | if (buffer) { | |
519 | if (size < used) | |
520 | return -ERANGE; | |
521 | buffer += len; | |
522 | } | |
523 | ||
524 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
525 | used += len; | |
526 | if (buffer) { | |
527 | if (size < used) | |
528 | return -ERANGE; | |
529 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
530 | buffer += len; | |
531 | } | |
532 | ||
533 | return used; | |
534 | } | |
535 | ||
536 | int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
537 | { | |
538 | int err = simple_setattr(dentry, iattr); | |
539 | ||
540 | if (!err && (iattr->ia_valid & ATTR_UID)) { | |
541 | struct socket *sock = SOCKET_I(d_inode(dentry)); | |
542 | ||
543 | sock->sk->sk_uid = iattr->ia_uid; | |
544 | } | |
545 | ||
546 | return err; | |
547 | } | |
548 | ||
549 | static const struct inode_operations sockfs_inode_ops = { | |
550 | .listxattr = sockfs_listxattr, | |
551 | .setattr = sockfs_setattr, | |
552 | }; | |
553 | ||
554 | /** | |
555 | * sock_alloc - allocate a socket | |
556 | * | |
557 | * Allocate a new inode and socket object. The two are bound together | |
558 | * and initialised. The socket is then returned. If we are out of inodes | |
559 | * NULL is returned. | |
560 | */ | |
561 | ||
562 | struct socket *sock_alloc(void) | |
563 | { | |
564 | struct inode *inode; | |
565 | struct socket *sock; | |
566 | ||
567 | inode = new_inode_pseudo(sock_mnt->mnt_sb); | |
568 | if (!inode) | |
569 | return NULL; | |
570 | ||
571 | sock = SOCKET_I(inode); | |
572 | ||
573 | kmemcheck_annotate_bitfield(sock, type); | |
574 | inode->i_ino = get_next_ino(); | |
575 | inode->i_mode = S_IFSOCK | S_IRWXUGO; | |
576 | inode->i_uid = current_fsuid(); | |
577 | inode->i_gid = current_fsgid(); | |
578 | inode->i_op = &sockfs_inode_ops; | |
579 | ||
580 | this_cpu_add(sockets_in_use, 1); | |
581 | return sock; | |
582 | } | |
583 | EXPORT_SYMBOL(sock_alloc); | |
584 | ||
585 | /** | |
586 | * sock_release - close a socket | |
587 | * @sock: socket to close | |
588 | * | |
589 | * The socket is released from the protocol stack if it has a release | |
590 | * callback, and the inode is then released if the socket is bound to | |
591 | * an inode not a file. | |
592 | */ | |
593 | ||
594 | void sock_release(struct socket *sock) | |
595 | { | |
596 | if (sock->ops) { | |
597 | struct module *owner = sock->ops->owner; | |
598 | ||
599 | sock->ops->release(sock); | |
600 | sock->ops = NULL; | |
601 | module_put(owner); | |
602 | } | |
603 | ||
604 | if (rcu_dereference_protected(sock->wq, 1)->fasync_list) | |
605 | pr_err("%s: fasync list not empty!\n", __func__); | |
606 | ||
607 | this_cpu_sub(sockets_in_use, 1); | |
608 | if (!sock->file) { | |
609 | iput(SOCK_INODE(sock)); | |
610 | return; | |
611 | } | |
612 | sock->file = NULL; | |
613 | } | |
614 | EXPORT_SYMBOL(sock_release); | |
615 | ||
616 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) | |
617 | { | |
618 | u8 flags = *tx_flags; | |
619 | ||
620 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) | |
621 | flags |= SKBTX_HW_TSTAMP; | |
622 | ||
623 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) | |
624 | flags |= SKBTX_SW_TSTAMP; | |
625 | ||
626 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) | |
627 | flags |= SKBTX_SCHED_TSTAMP; | |
628 | ||
629 | *tx_flags = flags; | |
630 | } | |
631 | EXPORT_SYMBOL(__sock_tx_timestamp); | |
632 | ||
633 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) | |
634 | { | |
635 | int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); | |
636 | BUG_ON(ret == -EIOCBQUEUED); | |
637 | return ret; | |
638 | } | |
639 | ||
640 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) | |
641 | { | |
642 | int err = security_socket_sendmsg(sock, msg, | |
643 | msg_data_left(msg)); | |
644 | ||
645 | return err ?: sock_sendmsg_nosec(sock, msg); | |
646 | } | |
647 | EXPORT_SYMBOL(sock_sendmsg); | |
648 | ||
649 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
650 | struct kvec *vec, size_t num, size_t size) | |
651 | { | |
652 | iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); | |
653 | return sock_sendmsg(sock, msg); | |
654 | } | |
655 | EXPORT_SYMBOL(kernel_sendmsg); | |
656 | ||
657 | /* | |
658 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
659 | */ | |
660 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
661 | struct sk_buff *skb) | |
662 | { | |
663 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); | |
664 | struct scm_timestamping tss; | |
665 | int empty = 1; | |
666 | struct skb_shared_hwtstamps *shhwtstamps = | |
667 | skb_hwtstamps(skb); | |
668 | ||
669 | /* Race occurred between timestamp enabling and packet | |
670 | receiving. Fill in the current time for now. */ | |
671 | if (need_software_tstamp && skb->tstamp == 0) | |
672 | __net_timestamp(skb); | |
673 | ||
674 | if (need_software_tstamp) { | |
675 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
676 | struct timeval tv; | |
677 | skb_get_timestamp(skb, &tv); | |
678 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, | |
679 | sizeof(tv), &tv); | |
680 | } else { | |
681 | struct timespec ts; | |
682 | skb_get_timestampns(skb, &ts); | |
683 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, | |
684 | sizeof(ts), &ts); | |
685 | } | |
686 | } | |
687 | ||
688 | memset(&tss, 0, sizeof(tss)); | |
689 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && | |
690 | ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) | |
691 | empty = 0; | |
692 | if (shhwtstamps && | |
693 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && | |
694 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) | |
695 | empty = 0; | |
696 | if (!empty) { | |
697 | put_cmsg(msg, SOL_SOCKET, | |
698 | SCM_TIMESTAMPING, sizeof(tss), &tss); | |
699 | ||
700 | if (skb->len && (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS)) | |
701 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, | |
702 | skb->len, skb->data); | |
703 | } | |
704 | } | |
705 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); | |
706 | ||
707 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
708 | struct sk_buff *skb) | |
709 | { | |
710 | int ack; | |
711 | ||
712 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
713 | return; | |
714 | if (!skb->wifi_acked_valid) | |
715 | return; | |
716 | ||
717 | ack = skb->wifi_acked; | |
718 | ||
719 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
720 | } | |
721 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
722 | ||
723 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, | |
724 | struct sk_buff *skb) | |
725 | { | |
726 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) | |
727 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, | |
728 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); | |
729 | } | |
730 | ||
731 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
732 | struct sk_buff *skb) | |
733 | { | |
734 | sock_recv_timestamp(msg, sk, skb); | |
735 | sock_recv_drops(msg, sk, skb); | |
736 | } | |
737 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); | |
738 | ||
739 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, | |
740 | int flags) | |
741 | { | |
742 | return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); | |
743 | } | |
744 | ||
745 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) | |
746 | { | |
747 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); | |
748 | ||
749 | return err ?: sock_recvmsg_nosec(sock, msg, flags); | |
750 | } | |
751 | EXPORT_SYMBOL(sock_recvmsg); | |
752 | ||
753 | /** | |
754 | * kernel_recvmsg - Receive a message from a socket (kernel space) | |
755 | * @sock: The socket to receive the message from | |
756 | * @msg: Received message | |
757 | * @vec: Input s/g array for message data | |
758 | * @num: Size of input s/g array | |
759 | * @size: Number of bytes to read | |
760 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
761 | * | |
762 | * On return the msg structure contains the scatter/gather array passed in the | |
763 | * vec argument. The array is modified so that it consists of the unfilled | |
764 | * portion of the original array. | |
765 | * | |
766 | * The returned value is the total number of bytes received, or an error. | |
767 | */ | |
768 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, | |
769 | struct kvec *vec, size_t num, size_t size, int flags) | |
770 | { | |
771 | mm_segment_t oldfs = get_fs(); | |
772 | int result; | |
773 | ||
774 | iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); | |
775 | set_fs(KERNEL_DS); | |
776 | result = sock_recvmsg(sock, msg, flags); | |
777 | set_fs(oldfs); | |
778 | return result; | |
779 | } | |
780 | EXPORT_SYMBOL(kernel_recvmsg); | |
781 | ||
782 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
783 | int offset, size_t size, loff_t *ppos, int more) | |
784 | { | |
785 | struct socket *sock; | |
786 | int flags; | |
787 | ||
788 | sock = file->private_data; | |
789 | ||
790 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
791 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
792 | flags |= more; | |
793 | ||
794 | return kernel_sendpage(sock, page, offset, size, flags); | |
795 | } | |
796 | ||
797 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, | |
798 | struct pipe_inode_info *pipe, size_t len, | |
799 | unsigned int flags) | |
800 | { | |
801 | struct socket *sock = file->private_data; | |
802 | ||
803 | if (unlikely(!sock->ops->splice_read)) | |
804 | return -EINVAL; | |
805 | ||
806 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); | |
807 | } | |
808 | ||
809 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) | |
810 | { | |
811 | struct file *file = iocb->ki_filp; | |
812 | struct socket *sock = file->private_data; | |
813 | struct msghdr msg = {.msg_iter = *to, | |
814 | .msg_iocb = iocb}; | |
815 | ssize_t res; | |
816 | ||
817 | if (file->f_flags & O_NONBLOCK) | |
818 | msg.msg_flags = MSG_DONTWAIT; | |
819 | ||
820 | if (iocb->ki_pos != 0) | |
821 | return -ESPIPE; | |
822 | ||
823 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ | |
824 | return 0; | |
825 | ||
826 | res = sock_recvmsg(sock, &msg, msg.msg_flags); | |
827 | *to = msg.msg_iter; | |
828 | return res; | |
829 | } | |
830 | ||
831 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) | |
832 | { | |
833 | struct file *file = iocb->ki_filp; | |
834 | struct socket *sock = file->private_data; | |
835 | struct msghdr msg = {.msg_iter = *from, | |
836 | .msg_iocb = iocb}; | |
837 | ssize_t res; | |
838 | ||
839 | if (iocb->ki_pos != 0) | |
840 | return -ESPIPE; | |
841 | ||
842 | if (file->f_flags & O_NONBLOCK) | |
843 | msg.msg_flags = MSG_DONTWAIT; | |
844 | ||
845 | if (sock->type == SOCK_SEQPACKET) | |
846 | msg.msg_flags |= MSG_EOR; | |
847 | ||
848 | res = sock_sendmsg(sock, &msg); | |
849 | *from = msg.msg_iter; | |
850 | return res; | |
851 | } | |
852 | ||
853 | /* | |
854 | * Atomic setting of ioctl hooks to avoid race | |
855 | * with module unload. | |
856 | */ | |
857 | ||
858 | static DEFINE_MUTEX(br_ioctl_mutex); | |
859 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); | |
860 | ||
861 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) | |
862 | { | |
863 | mutex_lock(&br_ioctl_mutex); | |
864 | br_ioctl_hook = hook; | |
865 | mutex_unlock(&br_ioctl_mutex); | |
866 | } | |
867 | EXPORT_SYMBOL(brioctl_set); | |
868 | ||
869 | static DEFINE_MUTEX(vlan_ioctl_mutex); | |
870 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); | |
871 | ||
872 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) | |
873 | { | |
874 | mutex_lock(&vlan_ioctl_mutex); | |
875 | vlan_ioctl_hook = hook; | |
876 | mutex_unlock(&vlan_ioctl_mutex); | |
877 | } | |
878 | EXPORT_SYMBOL(vlan_ioctl_set); | |
879 | ||
880 | static DEFINE_MUTEX(dlci_ioctl_mutex); | |
881 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); | |
882 | ||
883 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) | |
884 | { | |
885 | mutex_lock(&dlci_ioctl_mutex); | |
886 | dlci_ioctl_hook = hook; | |
887 | mutex_unlock(&dlci_ioctl_mutex); | |
888 | } | |
889 | EXPORT_SYMBOL(dlci_ioctl_set); | |
890 | ||
891 | static long sock_do_ioctl(struct net *net, struct socket *sock, | |
892 | unsigned int cmd, unsigned long arg) | |
893 | { | |
894 | int err; | |
895 | void __user *argp = (void __user *)arg; | |
896 | ||
897 | err = sock->ops->ioctl(sock, cmd, arg); | |
898 | ||
899 | /* | |
900 | * If this ioctl is unknown try to hand it down | |
901 | * to the NIC driver. | |
902 | */ | |
903 | if (err == -ENOIOCTLCMD) | |
904 | err = dev_ioctl(net, cmd, argp); | |
905 | ||
906 | return err; | |
907 | } | |
908 | ||
909 | /* | |
910 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
911 | * what to do with it - that's up to the protocol still. | |
912 | */ | |
913 | ||
914 | static struct ns_common *get_net_ns(struct ns_common *ns) | |
915 | { | |
916 | return &get_net(container_of(ns, struct net, ns))->ns; | |
917 | } | |
918 | ||
919 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
920 | { | |
921 | struct socket *sock; | |
922 | struct sock *sk; | |
923 | void __user *argp = (void __user *)arg; | |
924 | int pid, err; | |
925 | struct net *net; | |
926 | ||
927 | sock = file->private_data; | |
928 | sk = sock->sk; | |
929 | net = sock_net(sk); | |
930 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { | |
931 | err = dev_ioctl(net, cmd, argp); | |
932 | } else | |
933 | #ifdef CONFIG_WEXT_CORE | |
934 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { | |
935 | err = dev_ioctl(net, cmd, argp); | |
936 | } else | |
937 | #endif | |
938 | switch (cmd) { | |
939 | case FIOSETOWN: | |
940 | case SIOCSPGRP: | |
941 | err = -EFAULT; | |
942 | if (get_user(pid, (int __user *)argp)) | |
943 | break; | |
944 | f_setown(sock->file, pid, 1); | |
945 | err = 0; | |
946 | break; | |
947 | case FIOGETOWN: | |
948 | case SIOCGPGRP: | |
949 | err = put_user(f_getown(sock->file), | |
950 | (int __user *)argp); | |
951 | break; | |
952 | case SIOCGIFBR: | |
953 | case SIOCSIFBR: | |
954 | case SIOCBRADDBR: | |
955 | case SIOCBRDELBR: | |
956 | err = -ENOPKG; | |
957 | if (!br_ioctl_hook) | |
958 | request_module("bridge"); | |
959 | ||
960 | mutex_lock(&br_ioctl_mutex); | |
961 | if (br_ioctl_hook) | |
962 | err = br_ioctl_hook(net, cmd, argp); | |
963 | mutex_unlock(&br_ioctl_mutex); | |
964 | break; | |
965 | case SIOCGIFVLAN: | |
966 | case SIOCSIFVLAN: | |
967 | err = -ENOPKG; | |
968 | if (!vlan_ioctl_hook) | |
969 | request_module("8021q"); | |
970 | ||
971 | mutex_lock(&vlan_ioctl_mutex); | |
972 | if (vlan_ioctl_hook) | |
973 | err = vlan_ioctl_hook(net, argp); | |
974 | mutex_unlock(&vlan_ioctl_mutex); | |
975 | break; | |
976 | case SIOCADDDLCI: | |
977 | case SIOCDELDLCI: | |
978 | err = -ENOPKG; | |
979 | if (!dlci_ioctl_hook) | |
980 | request_module("dlci"); | |
981 | ||
982 | mutex_lock(&dlci_ioctl_mutex); | |
983 | if (dlci_ioctl_hook) | |
984 | err = dlci_ioctl_hook(cmd, argp); | |
985 | mutex_unlock(&dlci_ioctl_mutex); | |
986 | break; | |
987 | case SIOCGSKNS: | |
988 | err = -EPERM; | |
989 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
990 | break; | |
991 | ||
992 | err = open_related_ns(&net->ns, get_net_ns); | |
993 | break; | |
994 | default: | |
995 | err = sock_do_ioctl(net, sock, cmd, arg); | |
996 | break; | |
997 | } | |
998 | return err; | |
999 | } | |
1000 | ||
1001 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
1002 | { | |
1003 | int err; | |
1004 | struct socket *sock = NULL; | |
1005 | ||
1006 | err = security_socket_create(family, type, protocol, 1); | |
1007 | if (err) | |
1008 | goto out; | |
1009 | ||
1010 | sock = sock_alloc(); | |
1011 | if (!sock) { | |
1012 | err = -ENOMEM; | |
1013 | goto out; | |
1014 | } | |
1015 | ||
1016 | sock->type = type; | |
1017 | err = security_socket_post_create(sock, family, type, protocol, 1); | |
1018 | if (err) | |
1019 | goto out_release; | |
1020 | ||
1021 | out: | |
1022 | *res = sock; | |
1023 | return err; | |
1024 | out_release: | |
1025 | sock_release(sock); | |
1026 | sock = NULL; | |
1027 | goto out; | |
1028 | } | |
1029 | EXPORT_SYMBOL(sock_create_lite); | |
1030 | ||
1031 | /* No kernel lock held - perfect */ | |
1032 | static unsigned int sock_poll(struct file *file, poll_table *wait) | |
1033 | { | |
1034 | unsigned int busy_flag = 0; | |
1035 | struct socket *sock; | |
1036 | ||
1037 | /* | |
1038 | * We can't return errors to poll, so it's either yes or no. | |
1039 | */ | |
1040 | sock = file->private_data; | |
1041 | ||
1042 | if (sk_can_busy_loop(sock->sk)) { | |
1043 | /* this socket can poll_ll so tell the system call */ | |
1044 | busy_flag = POLL_BUSY_LOOP; | |
1045 | ||
1046 | /* once, only if requested by syscall */ | |
1047 | if (wait && (wait->_key & POLL_BUSY_LOOP)) | |
1048 | sk_busy_loop(sock->sk, 1); | |
1049 | } | |
1050 | ||
1051 | return busy_flag | sock->ops->poll(file, sock, wait); | |
1052 | } | |
1053 | ||
1054 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) | |
1055 | { | |
1056 | struct socket *sock = file->private_data; | |
1057 | ||
1058 | return sock->ops->mmap(file, sock, vma); | |
1059 | } | |
1060 | ||
1061 | static int sock_close(struct inode *inode, struct file *filp) | |
1062 | { | |
1063 | sock_release(SOCKET_I(inode)); | |
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Update the socket async list | |
1069 | * | |
1070 | * Fasync_list locking strategy. | |
1071 | * | |
1072 | * 1. fasync_list is modified only under process context socket lock | |
1073 | * i.e. under semaphore. | |
1074 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
1075 | * or under socket lock | |
1076 | */ | |
1077 | ||
1078 | static int sock_fasync(int fd, struct file *filp, int on) | |
1079 | { | |
1080 | struct socket *sock = filp->private_data; | |
1081 | struct sock *sk = sock->sk; | |
1082 | struct socket_wq *wq; | |
1083 | ||
1084 | if (sk == NULL) | |
1085 | return -EINVAL; | |
1086 | ||
1087 | lock_sock(sk); | |
1088 | wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk)); | |
1089 | fasync_helper(fd, filp, on, &wq->fasync_list); | |
1090 | ||
1091 | if (!wq->fasync_list) | |
1092 | sock_reset_flag(sk, SOCK_FASYNC); | |
1093 | else | |
1094 | sock_set_flag(sk, SOCK_FASYNC); | |
1095 | ||
1096 | release_sock(sk); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | /* This function may be called only under rcu_lock */ | |
1101 | ||
1102 | int sock_wake_async(struct socket_wq *wq, int how, int band) | |
1103 | { | |
1104 | if (!wq || !wq->fasync_list) | |
1105 | return -1; | |
1106 | ||
1107 | switch (how) { | |
1108 | case SOCK_WAKE_WAITD: | |
1109 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) | |
1110 | break; | |
1111 | goto call_kill; | |
1112 | case SOCK_WAKE_SPACE: | |
1113 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) | |
1114 | break; | |
1115 | /* fall through */ | |
1116 | case SOCK_WAKE_IO: | |
1117 | call_kill: | |
1118 | kill_fasync(&wq->fasync_list, SIGIO, band); | |
1119 | break; | |
1120 | case SOCK_WAKE_URG: | |
1121 | kill_fasync(&wq->fasync_list, SIGURG, band); | |
1122 | } | |
1123 | ||
1124 | return 0; | |
1125 | } | |
1126 | EXPORT_SYMBOL(sock_wake_async); | |
1127 | ||
1128 | int __sock_create(struct net *net, int family, int type, int protocol, | |
1129 | struct socket **res, int kern) | |
1130 | { | |
1131 | int err; | |
1132 | struct socket *sock; | |
1133 | const struct net_proto_family *pf; | |
1134 | ||
1135 | /* | |
1136 | * Check protocol is in range | |
1137 | */ | |
1138 | if (family < 0 || family >= NPROTO) | |
1139 | return -EAFNOSUPPORT; | |
1140 | if (type < 0 || type >= SOCK_MAX) | |
1141 | return -EINVAL; | |
1142 | ||
1143 | /* Compatibility. | |
1144 | ||
1145 | This uglymoron is moved from INET layer to here to avoid | |
1146 | deadlock in module load. | |
1147 | */ | |
1148 | if (family == PF_INET && type == SOCK_PACKET) { | |
1149 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", | |
1150 | current->comm); | |
1151 | family = PF_PACKET; | |
1152 | } | |
1153 | ||
1154 | err = security_socket_create(family, type, protocol, kern); | |
1155 | if (err) | |
1156 | return err; | |
1157 | ||
1158 | /* | |
1159 | * Allocate the socket and allow the family to set things up. if | |
1160 | * the protocol is 0, the family is instructed to select an appropriate | |
1161 | * default. | |
1162 | */ | |
1163 | sock = sock_alloc(); | |
1164 | if (!sock) { | |
1165 | net_warn_ratelimited("socket: no more sockets\n"); | |
1166 | return -ENFILE; /* Not exactly a match, but its the | |
1167 | closest posix thing */ | |
1168 | } | |
1169 | ||
1170 | sock->type = type; | |
1171 | ||
1172 | #ifdef CONFIG_MODULES | |
1173 | /* Attempt to load a protocol module if the find failed. | |
1174 | * | |
1175 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1176 | * requested real, full-featured networking support upon configuration. | |
1177 | * Otherwise module support will break! | |
1178 | */ | |
1179 | if (rcu_access_pointer(net_families[family]) == NULL) | |
1180 | request_module("net-pf-%d", family); | |
1181 | #endif | |
1182 | ||
1183 | rcu_read_lock(); | |
1184 | pf = rcu_dereference(net_families[family]); | |
1185 | err = -EAFNOSUPPORT; | |
1186 | if (!pf) | |
1187 | goto out_release; | |
1188 | ||
1189 | /* | |
1190 | * We will call the ->create function, that possibly is in a loadable | |
1191 | * module, so we have to bump that loadable module refcnt first. | |
1192 | */ | |
1193 | if (!try_module_get(pf->owner)) | |
1194 | goto out_release; | |
1195 | ||
1196 | /* Now protected by module ref count */ | |
1197 | rcu_read_unlock(); | |
1198 | ||
1199 | err = pf->create(net, sock, protocol, kern); | |
1200 | if (err < 0) | |
1201 | goto out_module_put; | |
1202 | ||
1203 | /* | |
1204 | * Now to bump the refcnt of the [loadable] module that owns this | |
1205 | * socket at sock_release time we decrement its refcnt. | |
1206 | */ | |
1207 | if (!try_module_get(sock->ops->owner)) | |
1208 | goto out_module_busy; | |
1209 | ||
1210 | /* | |
1211 | * Now that we're done with the ->create function, the [loadable] | |
1212 | * module can have its refcnt decremented | |
1213 | */ | |
1214 | module_put(pf->owner); | |
1215 | err = security_socket_post_create(sock, family, type, protocol, kern); | |
1216 | if (err) | |
1217 | goto out_sock_release; | |
1218 | *res = sock; | |
1219 | ||
1220 | return 0; | |
1221 | ||
1222 | out_module_busy: | |
1223 | err = -EAFNOSUPPORT; | |
1224 | out_module_put: | |
1225 | sock->ops = NULL; | |
1226 | module_put(pf->owner); | |
1227 | out_sock_release: | |
1228 | sock_release(sock); | |
1229 | return err; | |
1230 | ||
1231 | out_release: | |
1232 | rcu_read_unlock(); | |
1233 | goto out_sock_release; | |
1234 | } | |
1235 | EXPORT_SYMBOL(__sock_create); | |
1236 | ||
1237 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1238 | { | |
1239 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); | |
1240 | } | |
1241 | EXPORT_SYMBOL(sock_create); | |
1242 | ||
1243 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) | |
1244 | { | |
1245 | return __sock_create(net, family, type, protocol, res, 1); | |
1246 | } | |
1247 | EXPORT_SYMBOL(sock_create_kern); | |
1248 | ||
1249 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) | |
1250 | { | |
1251 | int retval; | |
1252 | struct socket *sock; | |
1253 | int flags; | |
1254 | ||
1255 | /* Check the SOCK_* constants for consistency. */ | |
1256 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1257 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1258 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1259 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1260 | ||
1261 | flags = type & ~SOCK_TYPE_MASK; | |
1262 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1263 | return -EINVAL; | |
1264 | type &= SOCK_TYPE_MASK; | |
1265 | ||
1266 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1267 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1268 | ||
1269 | retval = sock_create(family, type, protocol, &sock); | |
1270 | if (retval < 0) | |
1271 | goto out; | |
1272 | ||
1273 | retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); | |
1274 | if (retval < 0) | |
1275 | goto out_release; | |
1276 | ||
1277 | out: | |
1278 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1279 | return retval; | |
1280 | ||
1281 | out_release: | |
1282 | sock_release(sock); | |
1283 | return retval; | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * Create a pair of connected sockets. | |
1288 | */ | |
1289 | ||
1290 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, | |
1291 | int __user *, usockvec) | |
1292 | { | |
1293 | struct socket *sock1, *sock2; | |
1294 | int fd1, fd2, err; | |
1295 | struct file *newfile1, *newfile2; | |
1296 | int flags; | |
1297 | ||
1298 | flags = type & ~SOCK_TYPE_MASK; | |
1299 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1300 | return -EINVAL; | |
1301 | type &= SOCK_TYPE_MASK; | |
1302 | ||
1303 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1304 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1305 | ||
1306 | /* | |
1307 | * Obtain the first socket and check if the underlying protocol | |
1308 | * supports the socketpair call. | |
1309 | */ | |
1310 | ||
1311 | err = sock_create(family, type, protocol, &sock1); | |
1312 | if (err < 0) | |
1313 | goto out; | |
1314 | ||
1315 | err = sock_create(family, type, protocol, &sock2); | |
1316 | if (err < 0) | |
1317 | goto out_release_1; | |
1318 | ||
1319 | err = sock1->ops->socketpair(sock1, sock2); | |
1320 | if (err < 0) | |
1321 | goto out_release_both; | |
1322 | ||
1323 | fd1 = get_unused_fd_flags(flags); | |
1324 | if (unlikely(fd1 < 0)) { | |
1325 | err = fd1; | |
1326 | goto out_release_both; | |
1327 | } | |
1328 | ||
1329 | fd2 = get_unused_fd_flags(flags); | |
1330 | if (unlikely(fd2 < 0)) { | |
1331 | err = fd2; | |
1332 | goto out_put_unused_1; | |
1333 | } | |
1334 | ||
1335 | newfile1 = sock_alloc_file(sock1, flags, NULL); | |
1336 | if (IS_ERR(newfile1)) { | |
1337 | err = PTR_ERR(newfile1); | |
1338 | goto out_put_unused_both; | |
1339 | } | |
1340 | ||
1341 | newfile2 = sock_alloc_file(sock2, flags, NULL); | |
1342 | if (IS_ERR(newfile2)) { | |
1343 | err = PTR_ERR(newfile2); | |
1344 | goto out_fput_1; | |
1345 | } | |
1346 | ||
1347 | err = put_user(fd1, &usockvec[0]); | |
1348 | if (err) | |
1349 | goto out_fput_both; | |
1350 | ||
1351 | err = put_user(fd2, &usockvec[1]); | |
1352 | if (err) | |
1353 | goto out_fput_both; | |
1354 | ||
1355 | audit_fd_pair(fd1, fd2); | |
1356 | ||
1357 | fd_install(fd1, newfile1); | |
1358 | fd_install(fd2, newfile2); | |
1359 | /* fd1 and fd2 may be already another descriptors. | |
1360 | * Not kernel problem. | |
1361 | */ | |
1362 | ||
1363 | return 0; | |
1364 | ||
1365 | out_fput_both: | |
1366 | fput(newfile2); | |
1367 | fput(newfile1); | |
1368 | put_unused_fd(fd2); | |
1369 | put_unused_fd(fd1); | |
1370 | goto out; | |
1371 | ||
1372 | out_fput_1: | |
1373 | fput(newfile1); | |
1374 | put_unused_fd(fd2); | |
1375 | put_unused_fd(fd1); | |
1376 | sock_release(sock2); | |
1377 | goto out; | |
1378 | ||
1379 | out_put_unused_both: | |
1380 | put_unused_fd(fd2); | |
1381 | out_put_unused_1: | |
1382 | put_unused_fd(fd1); | |
1383 | out_release_both: | |
1384 | sock_release(sock2); | |
1385 | out_release_1: | |
1386 | sock_release(sock1); | |
1387 | out: | |
1388 | return err; | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * Bind a name to a socket. Nothing much to do here since it's | |
1393 | * the protocol's responsibility to handle the local address. | |
1394 | * | |
1395 | * We move the socket address to kernel space before we call | |
1396 | * the protocol layer (having also checked the address is ok). | |
1397 | */ | |
1398 | ||
1399 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) | |
1400 | { | |
1401 | struct socket *sock; | |
1402 | struct sockaddr_storage address; | |
1403 | int err, fput_needed; | |
1404 | ||
1405 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1406 | if (sock) { | |
1407 | err = move_addr_to_kernel(umyaddr, addrlen, &address); | |
1408 | if (err >= 0) { | |
1409 | err = security_socket_bind(sock, | |
1410 | (struct sockaddr *)&address, | |
1411 | addrlen); | |
1412 | if (!err) | |
1413 | err = sock->ops->bind(sock, | |
1414 | (struct sockaddr *) | |
1415 | &address, addrlen); | |
1416 | } | |
1417 | fput_light(sock->file, fput_needed); | |
1418 | } | |
1419 | return err; | |
1420 | } | |
1421 | ||
1422 | /* | |
1423 | * Perform a listen. Basically, we allow the protocol to do anything | |
1424 | * necessary for a listen, and if that works, we mark the socket as | |
1425 | * ready for listening. | |
1426 | */ | |
1427 | ||
1428 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) | |
1429 | { | |
1430 | struct socket *sock; | |
1431 | int err, fput_needed; | |
1432 | int somaxconn; | |
1433 | ||
1434 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1435 | if (sock) { | |
1436 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; | |
1437 | if ((unsigned int)backlog > somaxconn) | |
1438 | backlog = somaxconn; | |
1439 | ||
1440 | err = security_socket_listen(sock, backlog); | |
1441 | if (!err) | |
1442 | err = sock->ops->listen(sock, backlog); | |
1443 | ||
1444 | fput_light(sock->file, fput_needed); | |
1445 | } | |
1446 | return err; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * For accept, we attempt to create a new socket, set up the link | |
1451 | * with the client, wake up the client, then return the new | |
1452 | * connected fd. We collect the address of the connector in kernel | |
1453 | * space and move it to user at the very end. This is unclean because | |
1454 | * we open the socket then return an error. | |
1455 | * | |
1456 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1457 | * status to recvmsg. We need to add that support in a way thats | |
1458 | * clean when we restucture accept also. | |
1459 | */ | |
1460 | ||
1461 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1462 | int __user *, upeer_addrlen, int, flags) | |
1463 | { | |
1464 | struct socket *sock, *newsock; | |
1465 | struct file *newfile; | |
1466 | int err, len, newfd, fput_needed; | |
1467 | struct sockaddr_storage address; | |
1468 | ||
1469 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1470 | return -EINVAL; | |
1471 | ||
1472 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1473 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1474 | ||
1475 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1476 | if (!sock) | |
1477 | goto out; | |
1478 | ||
1479 | err = -ENFILE; | |
1480 | newsock = sock_alloc(); | |
1481 | if (!newsock) | |
1482 | goto out_put; | |
1483 | ||
1484 | newsock->type = sock->type; | |
1485 | newsock->ops = sock->ops; | |
1486 | ||
1487 | /* | |
1488 | * We don't need try_module_get here, as the listening socket (sock) | |
1489 | * has the protocol module (sock->ops->owner) held. | |
1490 | */ | |
1491 | __module_get(newsock->ops->owner); | |
1492 | ||
1493 | newfd = get_unused_fd_flags(flags); | |
1494 | if (unlikely(newfd < 0)) { | |
1495 | err = newfd; | |
1496 | sock_release(newsock); | |
1497 | goto out_put; | |
1498 | } | |
1499 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); | |
1500 | if (IS_ERR(newfile)) { | |
1501 | err = PTR_ERR(newfile); | |
1502 | put_unused_fd(newfd); | |
1503 | sock_release(newsock); | |
1504 | goto out_put; | |
1505 | } | |
1506 | ||
1507 | err = security_socket_accept(sock, newsock); | |
1508 | if (err) | |
1509 | goto out_fd; | |
1510 | ||
1511 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); | |
1512 | if (err < 0) | |
1513 | goto out_fd; | |
1514 | ||
1515 | if (upeer_sockaddr) { | |
1516 | if (newsock->ops->getname(newsock, (struct sockaddr *)&address, | |
1517 | &len, 2) < 0) { | |
1518 | err = -ECONNABORTED; | |
1519 | goto out_fd; | |
1520 | } | |
1521 | err = move_addr_to_user(&address, | |
1522 | len, upeer_sockaddr, upeer_addrlen); | |
1523 | if (err < 0) | |
1524 | goto out_fd; | |
1525 | } | |
1526 | ||
1527 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1528 | ||
1529 | fd_install(newfd, newfile); | |
1530 | err = newfd; | |
1531 | ||
1532 | out_put: | |
1533 | fput_light(sock->file, fput_needed); | |
1534 | out: | |
1535 | return err; | |
1536 | out_fd: | |
1537 | fput(newfile); | |
1538 | put_unused_fd(newfd); | |
1539 | goto out_put; | |
1540 | } | |
1541 | ||
1542 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1543 | int __user *, upeer_addrlen) | |
1544 | { | |
1545 | return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); | |
1546 | } | |
1547 | ||
1548 | /* | |
1549 | * Attempt to connect to a socket with the server address. The address | |
1550 | * is in user space so we verify it is OK and move it to kernel space. | |
1551 | * | |
1552 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1553 | * break bindings | |
1554 | * | |
1555 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1556 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1557 | * include the -EINPROGRESS status for such sockets. | |
1558 | */ | |
1559 | ||
1560 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, | |
1561 | int, addrlen) | |
1562 | { | |
1563 | struct socket *sock; | |
1564 | struct sockaddr_storage address; | |
1565 | int err, fput_needed; | |
1566 | ||
1567 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1568 | if (!sock) | |
1569 | goto out; | |
1570 | err = move_addr_to_kernel(uservaddr, addrlen, &address); | |
1571 | if (err < 0) | |
1572 | goto out_put; | |
1573 | ||
1574 | err = | |
1575 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); | |
1576 | if (err) | |
1577 | goto out_put; | |
1578 | ||
1579 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, | |
1580 | sock->file->f_flags); | |
1581 | out_put: | |
1582 | fput_light(sock->file, fput_needed); | |
1583 | out: | |
1584 | return err; | |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * Get the local address ('name') of a socket object. Move the obtained | |
1589 | * name to user space. | |
1590 | */ | |
1591 | ||
1592 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, | |
1593 | int __user *, usockaddr_len) | |
1594 | { | |
1595 | struct socket *sock; | |
1596 | struct sockaddr_storage address; | |
1597 | int len, err, fput_needed; | |
1598 | ||
1599 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1600 | if (!sock) | |
1601 | goto out; | |
1602 | ||
1603 | err = security_socket_getsockname(sock); | |
1604 | if (err) | |
1605 | goto out_put; | |
1606 | ||
1607 | err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); | |
1608 | if (err) | |
1609 | goto out_put; | |
1610 | err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); | |
1611 | ||
1612 | out_put: | |
1613 | fput_light(sock->file, fput_needed); | |
1614 | out: | |
1615 | return err; | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * Get the remote address ('name') of a socket object. Move the obtained | |
1620 | * name to user space. | |
1621 | */ | |
1622 | ||
1623 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, | |
1624 | int __user *, usockaddr_len) | |
1625 | { | |
1626 | struct socket *sock; | |
1627 | struct sockaddr_storage address; | |
1628 | int len, err, fput_needed; | |
1629 | ||
1630 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1631 | if (sock != NULL) { | |
1632 | err = security_socket_getpeername(sock); | |
1633 | if (err) { | |
1634 | fput_light(sock->file, fput_needed); | |
1635 | return err; | |
1636 | } | |
1637 | ||
1638 | err = | |
1639 | sock->ops->getname(sock, (struct sockaddr *)&address, &len, | |
1640 | 1); | |
1641 | if (!err) | |
1642 | err = move_addr_to_user(&address, len, usockaddr, | |
1643 | usockaddr_len); | |
1644 | fput_light(sock->file, fput_needed); | |
1645 | } | |
1646 | return err; | |
1647 | } | |
1648 | ||
1649 | /* | |
1650 | * Send a datagram to a given address. We move the address into kernel | |
1651 | * space and check the user space data area is readable before invoking | |
1652 | * the protocol. | |
1653 | */ | |
1654 | ||
1655 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, | |
1656 | unsigned int, flags, struct sockaddr __user *, addr, | |
1657 | int, addr_len) | |
1658 | { | |
1659 | struct socket *sock; | |
1660 | struct sockaddr_storage address; | |
1661 | int err; | |
1662 | struct msghdr msg; | |
1663 | struct iovec iov; | |
1664 | int fput_needed; | |
1665 | ||
1666 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); | |
1667 | if (unlikely(err)) | |
1668 | return err; | |
1669 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1670 | if (!sock) | |
1671 | goto out; | |
1672 | ||
1673 | msg.msg_name = NULL; | |
1674 | msg.msg_control = NULL; | |
1675 | msg.msg_controllen = 0; | |
1676 | msg.msg_namelen = 0; | |
1677 | if (addr) { | |
1678 | err = move_addr_to_kernel(addr, addr_len, &address); | |
1679 | if (err < 0) | |
1680 | goto out_put; | |
1681 | msg.msg_name = (struct sockaddr *)&address; | |
1682 | msg.msg_namelen = addr_len; | |
1683 | } | |
1684 | if (sock->file->f_flags & O_NONBLOCK) | |
1685 | flags |= MSG_DONTWAIT; | |
1686 | msg.msg_flags = flags; | |
1687 | err = sock_sendmsg(sock, &msg); | |
1688 | ||
1689 | out_put: | |
1690 | fput_light(sock->file, fput_needed); | |
1691 | out: | |
1692 | return err; | |
1693 | } | |
1694 | ||
1695 | /* | |
1696 | * Send a datagram down a socket. | |
1697 | */ | |
1698 | ||
1699 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, | |
1700 | unsigned int, flags) | |
1701 | { | |
1702 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1703 | } | |
1704 | ||
1705 | /* | |
1706 | * Receive a frame from the socket and optionally record the address of the | |
1707 | * sender. We verify the buffers are writable and if needed move the | |
1708 | * sender address from kernel to user space. | |
1709 | */ | |
1710 | ||
1711 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, | |
1712 | unsigned int, flags, struct sockaddr __user *, addr, | |
1713 | int __user *, addr_len) | |
1714 | { | |
1715 | struct socket *sock; | |
1716 | struct iovec iov; | |
1717 | struct msghdr msg; | |
1718 | struct sockaddr_storage address; | |
1719 | int err, err2; | |
1720 | int fput_needed; | |
1721 | ||
1722 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); | |
1723 | if (unlikely(err)) | |
1724 | return err; | |
1725 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1726 | if (!sock) | |
1727 | goto out; | |
1728 | ||
1729 | msg.msg_control = NULL; | |
1730 | msg.msg_controllen = 0; | |
1731 | /* Save some cycles and don't copy the address if not needed */ | |
1732 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; | |
1733 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
1734 | msg.msg_namelen = 0; | |
1735 | msg.msg_iocb = NULL; | |
1736 | if (sock->file->f_flags & O_NONBLOCK) | |
1737 | flags |= MSG_DONTWAIT; | |
1738 | err = sock_recvmsg(sock, &msg, flags); | |
1739 | ||
1740 | if (err >= 0 && addr != NULL) { | |
1741 | err2 = move_addr_to_user(&address, | |
1742 | msg.msg_namelen, addr, addr_len); | |
1743 | if (err2 < 0) | |
1744 | err = err2; | |
1745 | } | |
1746 | ||
1747 | fput_light(sock->file, fput_needed); | |
1748 | out: | |
1749 | return err; | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * Receive a datagram from a socket. | |
1754 | */ | |
1755 | ||
1756 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, | |
1757 | unsigned int, flags) | |
1758 | { | |
1759 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1760 | } | |
1761 | ||
1762 | /* | |
1763 | * Set a socket option. Because we don't know the option lengths we have | |
1764 | * to pass the user mode parameter for the protocols to sort out. | |
1765 | */ | |
1766 | ||
1767 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, | |
1768 | char __user *, optval, int, optlen) | |
1769 | { | |
1770 | int err, fput_needed; | |
1771 | struct socket *sock; | |
1772 | ||
1773 | if (optlen < 0) | |
1774 | return -EINVAL; | |
1775 | ||
1776 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1777 | if (sock != NULL) { | |
1778 | err = security_socket_setsockopt(sock, level, optname); | |
1779 | if (err) | |
1780 | goto out_put; | |
1781 | ||
1782 | if (level == SOL_SOCKET) | |
1783 | err = | |
1784 | sock_setsockopt(sock, level, optname, optval, | |
1785 | optlen); | |
1786 | else | |
1787 | err = | |
1788 | sock->ops->setsockopt(sock, level, optname, optval, | |
1789 | optlen); | |
1790 | out_put: | |
1791 | fput_light(sock->file, fput_needed); | |
1792 | } | |
1793 | return err; | |
1794 | } | |
1795 | ||
1796 | /* | |
1797 | * Get a socket option. Because we don't know the option lengths we have | |
1798 | * to pass a user mode parameter for the protocols to sort out. | |
1799 | */ | |
1800 | ||
1801 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, | |
1802 | char __user *, optval, int __user *, optlen) | |
1803 | { | |
1804 | int err, fput_needed; | |
1805 | struct socket *sock; | |
1806 | ||
1807 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1808 | if (sock != NULL) { | |
1809 | err = security_socket_getsockopt(sock, level, optname); | |
1810 | if (err) | |
1811 | goto out_put; | |
1812 | ||
1813 | if (level == SOL_SOCKET) | |
1814 | err = | |
1815 | sock_getsockopt(sock, level, optname, optval, | |
1816 | optlen); | |
1817 | else | |
1818 | err = | |
1819 | sock->ops->getsockopt(sock, level, optname, optval, | |
1820 | optlen); | |
1821 | out_put: | |
1822 | fput_light(sock->file, fput_needed); | |
1823 | } | |
1824 | return err; | |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | * Shutdown a socket. | |
1829 | */ | |
1830 | ||
1831 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) | |
1832 | { | |
1833 | int err, fput_needed; | |
1834 | struct socket *sock; | |
1835 | ||
1836 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1837 | if (sock != NULL) { | |
1838 | err = security_socket_shutdown(sock, how); | |
1839 | if (!err) | |
1840 | err = sock->ops->shutdown(sock, how); | |
1841 | fput_light(sock->file, fput_needed); | |
1842 | } | |
1843 | return err; | |
1844 | } | |
1845 | ||
1846 | /* A couple of helpful macros for getting the address of the 32/64 bit | |
1847 | * fields which are the same type (int / unsigned) on our platforms. | |
1848 | */ | |
1849 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1850 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1851 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1852 | ||
1853 | struct used_address { | |
1854 | struct sockaddr_storage name; | |
1855 | unsigned int name_len; | |
1856 | }; | |
1857 | ||
1858 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
1859 | struct user_msghdr __user *umsg, | |
1860 | struct sockaddr __user **save_addr, | |
1861 | struct iovec **iov) | |
1862 | { | |
1863 | struct sockaddr __user *uaddr; | |
1864 | struct iovec __user *uiov; | |
1865 | size_t nr_segs; | |
1866 | ssize_t err; | |
1867 | ||
1868 | if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || | |
1869 | __get_user(uaddr, &umsg->msg_name) || | |
1870 | __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || | |
1871 | __get_user(uiov, &umsg->msg_iov) || | |
1872 | __get_user(nr_segs, &umsg->msg_iovlen) || | |
1873 | __get_user(kmsg->msg_control, &umsg->msg_control) || | |
1874 | __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || | |
1875 | __get_user(kmsg->msg_flags, &umsg->msg_flags)) | |
1876 | return -EFAULT; | |
1877 | ||
1878 | if (!uaddr) | |
1879 | kmsg->msg_namelen = 0; | |
1880 | ||
1881 | if (kmsg->msg_namelen < 0) | |
1882 | return -EINVAL; | |
1883 | ||
1884 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) | |
1885 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); | |
1886 | ||
1887 | if (save_addr) | |
1888 | *save_addr = uaddr; | |
1889 | ||
1890 | if (uaddr && kmsg->msg_namelen) { | |
1891 | if (!save_addr) { | |
1892 | err = move_addr_to_kernel(uaddr, kmsg->msg_namelen, | |
1893 | kmsg->msg_name); | |
1894 | if (err < 0) | |
1895 | return err; | |
1896 | } | |
1897 | } else { | |
1898 | kmsg->msg_name = NULL; | |
1899 | kmsg->msg_namelen = 0; | |
1900 | } | |
1901 | ||
1902 | if (nr_segs > UIO_MAXIOV) | |
1903 | return -EMSGSIZE; | |
1904 | ||
1905 | kmsg->msg_iocb = NULL; | |
1906 | ||
1907 | return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs, | |
1908 | UIO_FASTIOV, iov, &kmsg->msg_iter); | |
1909 | } | |
1910 | ||
1911 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
1912 | struct msghdr *msg_sys, unsigned int flags, | |
1913 | struct used_address *used_address, | |
1914 | unsigned int allowed_msghdr_flags) | |
1915 | { | |
1916 | struct compat_msghdr __user *msg_compat = | |
1917 | (struct compat_msghdr __user *)msg; | |
1918 | struct sockaddr_storage address; | |
1919 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1920 | unsigned char ctl[sizeof(struct cmsghdr) + 20] | |
1921 | __aligned(sizeof(__kernel_size_t)); | |
1922 | /* 20 is size of ipv6_pktinfo */ | |
1923 | unsigned char *ctl_buf = ctl; | |
1924 | int ctl_len; | |
1925 | ssize_t err; | |
1926 | ||
1927 | msg_sys->msg_name = &address; | |
1928 | ||
1929 | if (MSG_CMSG_COMPAT & flags) | |
1930 | err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); | |
1931 | else | |
1932 | err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); | |
1933 | if (err < 0) | |
1934 | return err; | |
1935 | ||
1936 | err = -ENOBUFS; | |
1937 | ||
1938 | if (msg_sys->msg_controllen > INT_MAX) | |
1939 | goto out_freeiov; | |
1940 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); | |
1941 | ctl_len = msg_sys->msg_controllen; | |
1942 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { | |
1943 | err = | |
1944 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, | |
1945 | sizeof(ctl)); | |
1946 | if (err) | |
1947 | goto out_freeiov; | |
1948 | ctl_buf = msg_sys->msg_control; | |
1949 | ctl_len = msg_sys->msg_controllen; | |
1950 | } else if (ctl_len) { | |
1951 | if (ctl_len > sizeof(ctl)) { | |
1952 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); | |
1953 | if (ctl_buf == NULL) | |
1954 | goto out_freeiov; | |
1955 | } | |
1956 | err = -EFAULT; | |
1957 | /* | |
1958 | * Careful! Before this, msg_sys->msg_control contains a user pointer. | |
1959 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1960 | * checking falls down on this. | |
1961 | */ | |
1962 | if (copy_from_user(ctl_buf, | |
1963 | (void __user __force *)msg_sys->msg_control, | |
1964 | ctl_len)) | |
1965 | goto out_freectl; | |
1966 | msg_sys->msg_control = ctl_buf; | |
1967 | } | |
1968 | msg_sys->msg_flags = flags; | |
1969 | ||
1970 | if (sock->file->f_flags & O_NONBLOCK) | |
1971 | msg_sys->msg_flags |= MSG_DONTWAIT; | |
1972 | /* | |
1973 | * If this is sendmmsg() and current destination address is same as | |
1974 | * previously succeeded address, omit asking LSM's decision. | |
1975 | * used_address->name_len is initialized to UINT_MAX so that the first | |
1976 | * destination address never matches. | |
1977 | */ | |
1978 | if (used_address && msg_sys->msg_name && | |
1979 | used_address->name_len == msg_sys->msg_namelen && | |
1980 | !memcmp(&used_address->name, msg_sys->msg_name, | |
1981 | used_address->name_len)) { | |
1982 | err = sock_sendmsg_nosec(sock, msg_sys); | |
1983 | goto out_freectl; | |
1984 | } | |
1985 | err = sock_sendmsg(sock, msg_sys); | |
1986 | /* | |
1987 | * If this is sendmmsg() and sending to current destination address was | |
1988 | * successful, remember it. | |
1989 | */ | |
1990 | if (used_address && err >= 0) { | |
1991 | used_address->name_len = msg_sys->msg_namelen; | |
1992 | if (msg_sys->msg_name) | |
1993 | memcpy(&used_address->name, msg_sys->msg_name, | |
1994 | used_address->name_len); | |
1995 | } | |
1996 | ||
1997 | out_freectl: | |
1998 | if (ctl_buf != ctl) | |
1999 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); | |
2000 | out_freeiov: | |
2001 | kfree(iov); | |
2002 | return err; | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * BSD sendmsg interface | |
2007 | */ | |
2008 | ||
2009 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) | |
2010 | { | |
2011 | int fput_needed, err; | |
2012 | struct msghdr msg_sys; | |
2013 | struct socket *sock; | |
2014 | ||
2015 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2016 | if (!sock) | |
2017 | goto out; | |
2018 | ||
2019 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); | |
2020 | ||
2021 | fput_light(sock->file, fput_needed); | |
2022 | out: | |
2023 | return err; | |
2024 | } | |
2025 | ||
2026 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) | |
2027 | { | |
2028 | if (flags & MSG_CMSG_COMPAT) | |
2029 | return -EINVAL; | |
2030 | return __sys_sendmsg(fd, msg, flags); | |
2031 | } | |
2032 | ||
2033 | /* | |
2034 | * Linux sendmmsg interface | |
2035 | */ | |
2036 | ||
2037 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
2038 | unsigned int flags) | |
2039 | { | |
2040 | int fput_needed, err, datagrams; | |
2041 | struct socket *sock; | |
2042 | struct mmsghdr __user *entry; | |
2043 | struct compat_mmsghdr __user *compat_entry; | |
2044 | struct msghdr msg_sys; | |
2045 | struct used_address used_address; | |
2046 | unsigned int oflags = flags; | |
2047 | ||
2048 | if (vlen > UIO_MAXIOV) | |
2049 | vlen = UIO_MAXIOV; | |
2050 | ||
2051 | datagrams = 0; | |
2052 | ||
2053 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2054 | if (!sock) | |
2055 | return err; | |
2056 | ||
2057 | used_address.name_len = UINT_MAX; | |
2058 | entry = mmsg; | |
2059 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
2060 | err = 0; | |
2061 | flags |= MSG_BATCH; | |
2062 | ||
2063 | while (datagrams < vlen) { | |
2064 | if (datagrams == vlen - 1) | |
2065 | flags = oflags; | |
2066 | ||
2067 | if (MSG_CMSG_COMPAT & flags) { | |
2068 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, | |
2069 | &msg_sys, flags, &used_address, MSG_EOR); | |
2070 | if (err < 0) | |
2071 | break; | |
2072 | err = __put_user(err, &compat_entry->msg_len); | |
2073 | ++compat_entry; | |
2074 | } else { | |
2075 | err = ___sys_sendmsg(sock, | |
2076 | (struct user_msghdr __user *)entry, | |
2077 | &msg_sys, flags, &used_address, MSG_EOR); | |
2078 | if (err < 0) | |
2079 | break; | |
2080 | err = put_user(err, &entry->msg_len); | |
2081 | ++entry; | |
2082 | } | |
2083 | ||
2084 | if (err) | |
2085 | break; | |
2086 | ++datagrams; | |
2087 | if (msg_data_left(&msg_sys)) | |
2088 | break; | |
2089 | cond_resched(); | |
2090 | } | |
2091 | ||
2092 | fput_light(sock->file, fput_needed); | |
2093 | ||
2094 | /* We only return an error if no datagrams were able to be sent */ | |
2095 | if (datagrams != 0) | |
2096 | return datagrams; | |
2097 | ||
2098 | return err; | |
2099 | } | |
2100 | ||
2101 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2102 | unsigned int, vlen, unsigned int, flags) | |
2103 | { | |
2104 | if (flags & MSG_CMSG_COMPAT) | |
2105 | return -EINVAL; | |
2106 | return __sys_sendmmsg(fd, mmsg, vlen, flags); | |
2107 | } | |
2108 | ||
2109 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2110 | struct msghdr *msg_sys, unsigned int flags, int nosec) | |
2111 | { | |
2112 | struct compat_msghdr __user *msg_compat = | |
2113 | (struct compat_msghdr __user *)msg; | |
2114 | struct iovec iovstack[UIO_FASTIOV]; | |
2115 | struct iovec *iov = iovstack; | |
2116 | unsigned long cmsg_ptr; | |
2117 | int len; | |
2118 | ssize_t err; | |
2119 | ||
2120 | /* kernel mode address */ | |
2121 | struct sockaddr_storage addr; | |
2122 | ||
2123 | /* user mode address pointers */ | |
2124 | struct sockaddr __user *uaddr; | |
2125 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2126 | ||
2127 | msg_sys->msg_name = &addr; | |
2128 | ||
2129 | if (MSG_CMSG_COMPAT & flags) | |
2130 | err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); | |
2131 | else | |
2132 | err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); | |
2133 | if (err < 0) | |
2134 | return err; | |
2135 | ||
2136 | cmsg_ptr = (unsigned long)msg_sys->msg_control; | |
2137 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
2138 | ||
2139 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
2140 | msg_sys->msg_namelen = 0; | |
2141 | ||
2142 | if (sock->file->f_flags & O_NONBLOCK) | |
2143 | flags |= MSG_DONTWAIT; | |
2144 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); | |
2145 | if (err < 0) | |
2146 | goto out_freeiov; | |
2147 | len = err; | |
2148 | ||
2149 | if (uaddr != NULL) { | |
2150 | err = move_addr_to_user(&addr, | |
2151 | msg_sys->msg_namelen, uaddr, | |
2152 | uaddr_len); | |
2153 | if (err < 0) | |
2154 | goto out_freeiov; | |
2155 | } | |
2156 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), | |
2157 | COMPAT_FLAGS(msg)); | |
2158 | if (err) | |
2159 | goto out_freeiov; | |
2160 | if (MSG_CMSG_COMPAT & flags) | |
2161 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2162 | &msg_compat->msg_controllen); | |
2163 | else | |
2164 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2165 | &msg->msg_controllen); | |
2166 | if (err) | |
2167 | goto out_freeiov; | |
2168 | err = len; | |
2169 | ||
2170 | out_freeiov: | |
2171 | kfree(iov); | |
2172 | return err; | |
2173 | } | |
2174 | ||
2175 | /* | |
2176 | * BSD recvmsg interface | |
2177 | */ | |
2178 | ||
2179 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) | |
2180 | { | |
2181 | int fput_needed, err; | |
2182 | struct msghdr msg_sys; | |
2183 | struct socket *sock; | |
2184 | ||
2185 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2186 | if (!sock) | |
2187 | goto out; | |
2188 | ||
2189 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); | |
2190 | ||
2191 | fput_light(sock->file, fput_needed); | |
2192 | out: | |
2193 | return err; | |
2194 | } | |
2195 | ||
2196 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, | |
2197 | unsigned int, flags) | |
2198 | { | |
2199 | if (flags & MSG_CMSG_COMPAT) | |
2200 | return -EINVAL; | |
2201 | return __sys_recvmsg(fd, msg, flags); | |
2202 | } | |
2203 | ||
2204 | /* | |
2205 | * Linux recvmmsg interface | |
2206 | */ | |
2207 | ||
2208 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
2209 | unsigned int flags, struct timespec *timeout) | |
2210 | { | |
2211 | int fput_needed, err, datagrams; | |
2212 | struct socket *sock; | |
2213 | struct mmsghdr __user *entry; | |
2214 | struct compat_mmsghdr __user *compat_entry; | |
2215 | struct msghdr msg_sys; | |
2216 | struct timespec64 end_time; | |
2217 | struct timespec64 timeout64; | |
2218 | ||
2219 | if (timeout && | |
2220 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2221 | timeout->tv_nsec)) | |
2222 | return -EINVAL; | |
2223 | ||
2224 | datagrams = 0; | |
2225 | ||
2226 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2227 | if (!sock) | |
2228 | return err; | |
2229 | ||
2230 | err = sock_error(sock->sk); | |
2231 | if (err) | |
2232 | goto out_put; | |
2233 | ||
2234 | entry = mmsg; | |
2235 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
2236 | ||
2237 | while (datagrams < vlen) { | |
2238 | /* | |
2239 | * No need to ask LSM for more than the first datagram. | |
2240 | */ | |
2241 | if (MSG_CMSG_COMPAT & flags) { | |
2242 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, | |
2243 | &msg_sys, flags & ~MSG_WAITFORONE, | |
2244 | datagrams); | |
2245 | if (err < 0) | |
2246 | break; | |
2247 | err = __put_user(err, &compat_entry->msg_len); | |
2248 | ++compat_entry; | |
2249 | } else { | |
2250 | err = ___sys_recvmsg(sock, | |
2251 | (struct user_msghdr __user *)entry, | |
2252 | &msg_sys, flags & ~MSG_WAITFORONE, | |
2253 | datagrams); | |
2254 | if (err < 0) | |
2255 | break; | |
2256 | err = put_user(err, &entry->msg_len); | |
2257 | ++entry; | |
2258 | } | |
2259 | ||
2260 | if (err) | |
2261 | break; | |
2262 | ++datagrams; | |
2263 | ||
2264 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ | |
2265 | if (flags & MSG_WAITFORONE) | |
2266 | flags |= MSG_DONTWAIT; | |
2267 | ||
2268 | if (timeout) { | |
2269 | ktime_get_ts64(&timeout64); | |
2270 | *timeout = timespec64_to_timespec( | |
2271 | timespec64_sub(end_time, timeout64)); | |
2272 | if (timeout->tv_sec < 0) { | |
2273 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2274 | break; | |
2275 | } | |
2276 | ||
2277 | /* Timeout, return less than vlen datagrams */ | |
2278 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2279 | break; | |
2280 | } | |
2281 | ||
2282 | /* Out of band data, return right away */ | |
2283 | if (msg_sys.msg_flags & MSG_OOB) | |
2284 | break; | |
2285 | cond_resched(); | |
2286 | } | |
2287 | ||
2288 | if (err == 0) | |
2289 | goto out_put; | |
2290 | ||
2291 | if (datagrams == 0) { | |
2292 | datagrams = err; | |
2293 | goto out_put; | |
2294 | } | |
2295 | ||
2296 | /* | |
2297 | * We may return less entries than requested (vlen) if the | |
2298 | * sock is non block and there aren't enough datagrams... | |
2299 | */ | |
2300 | if (err != -EAGAIN) { | |
2301 | /* | |
2302 | * ... or if recvmsg returns an error after we | |
2303 | * received some datagrams, where we record the | |
2304 | * error to return on the next call or if the | |
2305 | * app asks about it using getsockopt(SO_ERROR). | |
2306 | */ | |
2307 | sock->sk->sk_err = -err; | |
2308 | } | |
2309 | out_put: | |
2310 | fput_light(sock->file, fput_needed); | |
2311 | ||
2312 | return datagrams; | |
2313 | } | |
2314 | ||
2315 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2316 | unsigned int, vlen, unsigned int, flags, | |
2317 | struct timespec __user *, timeout) | |
2318 | { | |
2319 | int datagrams; | |
2320 | struct timespec timeout_sys; | |
2321 | ||
2322 | if (flags & MSG_CMSG_COMPAT) | |
2323 | return -EINVAL; | |
2324 | ||
2325 | if (!timeout) | |
2326 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2327 | ||
2328 | if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) | |
2329 | return -EFAULT; | |
2330 | ||
2331 | datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
2332 | ||
2333 | if (datagrams > 0 && | |
2334 | copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) | |
2335 | datagrams = -EFAULT; | |
2336 | ||
2337 | return datagrams; | |
2338 | } | |
2339 | ||
2340 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
2341 | /* Argument list sizes for sys_socketcall */ | |
2342 | #define AL(x) ((x) * sizeof(unsigned long)) | |
2343 | static const unsigned char nargs[21] = { | |
2344 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), | |
2345 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2346 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
2347 | AL(4), AL(5), AL(4) | |
2348 | }; | |
2349 | ||
2350 | #undef AL | |
2351 | ||
2352 | /* | |
2353 | * System call vectors. | |
2354 | * | |
2355 | * Argument checking cleaned up. Saved 20% in size. | |
2356 | * This function doesn't need to set the kernel lock because | |
2357 | * it is set by the callees. | |
2358 | */ | |
2359 | ||
2360 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) | |
2361 | { | |
2362 | unsigned long a[AUDITSC_ARGS]; | |
2363 | unsigned long a0, a1; | |
2364 | int err; | |
2365 | unsigned int len; | |
2366 | ||
2367 | if (call < 1 || call > SYS_SENDMMSG) | |
2368 | return -EINVAL; | |
2369 | ||
2370 | len = nargs[call]; | |
2371 | if (len > sizeof(a)) | |
2372 | return -EINVAL; | |
2373 | ||
2374 | /* copy_from_user should be SMP safe. */ | |
2375 | if (copy_from_user(a, args, len)) | |
2376 | return -EFAULT; | |
2377 | ||
2378 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); | |
2379 | if (err) | |
2380 | return err; | |
2381 | ||
2382 | a0 = a[0]; | |
2383 | a1 = a[1]; | |
2384 | ||
2385 | switch (call) { | |
2386 | case SYS_SOCKET: | |
2387 | err = sys_socket(a0, a1, a[2]); | |
2388 | break; | |
2389 | case SYS_BIND: | |
2390 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2391 | break; | |
2392 | case SYS_CONNECT: | |
2393 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2394 | break; | |
2395 | case SYS_LISTEN: | |
2396 | err = sys_listen(a0, a1); | |
2397 | break; | |
2398 | case SYS_ACCEPT: | |
2399 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2400 | (int __user *)a[2], 0); | |
2401 | break; | |
2402 | case SYS_GETSOCKNAME: | |
2403 | err = | |
2404 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2405 | (int __user *)a[2]); | |
2406 | break; | |
2407 | case SYS_GETPEERNAME: | |
2408 | err = | |
2409 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2410 | (int __user *)a[2]); | |
2411 | break; | |
2412 | case SYS_SOCKETPAIR: | |
2413 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2414 | break; | |
2415 | case SYS_SEND: | |
2416 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2417 | break; | |
2418 | case SYS_SENDTO: | |
2419 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2420 | (struct sockaddr __user *)a[4], a[5]); | |
2421 | break; | |
2422 | case SYS_RECV: | |
2423 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2424 | break; | |
2425 | case SYS_RECVFROM: | |
2426 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2427 | (struct sockaddr __user *)a[4], | |
2428 | (int __user *)a[5]); | |
2429 | break; | |
2430 | case SYS_SHUTDOWN: | |
2431 | err = sys_shutdown(a0, a1); | |
2432 | break; | |
2433 | case SYS_SETSOCKOPT: | |
2434 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2435 | break; | |
2436 | case SYS_GETSOCKOPT: | |
2437 | err = | |
2438 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2439 | (int __user *)a[4]); | |
2440 | break; | |
2441 | case SYS_SENDMSG: | |
2442 | err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]); | |
2443 | break; | |
2444 | case SYS_SENDMMSG: | |
2445 | err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); | |
2446 | break; | |
2447 | case SYS_RECVMSG: | |
2448 | err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]); | |
2449 | break; | |
2450 | case SYS_RECVMMSG: | |
2451 | err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], | |
2452 | (struct timespec __user *)a[4]); | |
2453 | break; | |
2454 | case SYS_ACCEPT4: | |
2455 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2456 | (int __user *)a[2], a[3]); | |
2457 | break; | |
2458 | default: | |
2459 | err = -EINVAL; | |
2460 | break; | |
2461 | } | |
2462 | return err; | |
2463 | } | |
2464 | ||
2465 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ | |
2466 | ||
2467 | /** | |
2468 | * sock_register - add a socket protocol handler | |
2469 | * @ops: description of protocol | |
2470 | * | |
2471 | * This function is called by a protocol handler that wants to | |
2472 | * advertise its address family, and have it linked into the | |
2473 | * socket interface. The value ops->family corresponds to the | |
2474 | * socket system call protocol family. | |
2475 | */ | |
2476 | int sock_register(const struct net_proto_family *ops) | |
2477 | { | |
2478 | int err; | |
2479 | ||
2480 | if (ops->family >= NPROTO) { | |
2481 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); | |
2482 | return -ENOBUFS; | |
2483 | } | |
2484 | ||
2485 | spin_lock(&net_family_lock); | |
2486 | if (rcu_dereference_protected(net_families[ops->family], | |
2487 | lockdep_is_held(&net_family_lock))) | |
2488 | err = -EEXIST; | |
2489 | else { | |
2490 | rcu_assign_pointer(net_families[ops->family], ops); | |
2491 | err = 0; | |
2492 | } | |
2493 | spin_unlock(&net_family_lock); | |
2494 | ||
2495 | pr_info("NET: Registered protocol family %d\n", ops->family); | |
2496 | return err; | |
2497 | } | |
2498 | EXPORT_SYMBOL(sock_register); | |
2499 | ||
2500 | /** | |
2501 | * sock_unregister - remove a protocol handler | |
2502 | * @family: protocol family to remove | |
2503 | * | |
2504 | * This function is called by a protocol handler that wants to | |
2505 | * remove its address family, and have it unlinked from the | |
2506 | * new socket creation. | |
2507 | * | |
2508 | * If protocol handler is a module, then it can use module reference | |
2509 | * counts to protect against new references. If protocol handler is not | |
2510 | * a module then it needs to provide its own protection in | |
2511 | * the ops->create routine. | |
2512 | */ | |
2513 | void sock_unregister(int family) | |
2514 | { | |
2515 | BUG_ON(family < 0 || family >= NPROTO); | |
2516 | ||
2517 | spin_lock(&net_family_lock); | |
2518 | RCU_INIT_POINTER(net_families[family], NULL); | |
2519 | spin_unlock(&net_family_lock); | |
2520 | ||
2521 | synchronize_rcu(); | |
2522 | ||
2523 | pr_info("NET: Unregistered protocol family %d\n", family); | |
2524 | } | |
2525 | EXPORT_SYMBOL(sock_unregister); | |
2526 | ||
2527 | static int __init sock_init(void) | |
2528 | { | |
2529 | int err; | |
2530 | /* | |
2531 | * Initialize the network sysctl infrastructure. | |
2532 | */ | |
2533 | err = net_sysctl_init(); | |
2534 | if (err) | |
2535 | goto out; | |
2536 | ||
2537 | /* | |
2538 | * Initialize skbuff SLAB cache | |
2539 | */ | |
2540 | skb_init(); | |
2541 | ||
2542 | /* | |
2543 | * Initialize the protocols module. | |
2544 | */ | |
2545 | ||
2546 | init_inodecache(); | |
2547 | ||
2548 | err = register_filesystem(&sock_fs_type); | |
2549 | if (err) | |
2550 | goto out_fs; | |
2551 | sock_mnt = kern_mount(&sock_fs_type); | |
2552 | if (IS_ERR(sock_mnt)) { | |
2553 | err = PTR_ERR(sock_mnt); | |
2554 | goto out_mount; | |
2555 | } | |
2556 | ||
2557 | /* The real protocol initialization is performed in later initcalls. | |
2558 | */ | |
2559 | ||
2560 | #ifdef CONFIG_NETFILTER | |
2561 | err = netfilter_init(); | |
2562 | if (err) | |
2563 | goto out; | |
2564 | #endif | |
2565 | ||
2566 | ptp_classifier_init(); | |
2567 | ||
2568 | out: | |
2569 | return err; | |
2570 | ||
2571 | out_mount: | |
2572 | unregister_filesystem(&sock_fs_type); | |
2573 | out_fs: | |
2574 | goto out; | |
2575 | } | |
2576 | ||
2577 | core_initcall(sock_init); /* early initcall */ | |
2578 | ||
2579 | #ifdef CONFIG_PROC_FS | |
2580 | void socket_seq_show(struct seq_file *seq) | |
2581 | { | |
2582 | int cpu; | |
2583 | int counter = 0; | |
2584 | ||
2585 | for_each_possible_cpu(cpu) | |
2586 | counter += per_cpu(sockets_in_use, cpu); | |
2587 | ||
2588 | /* It can be negative, by the way. 8) */ | |
2589 | if (counter < 0) | |
2590 | counter = 0; | |
2591 | ||
2592 | seq_printf(seq, "sockets: used %d\n", counter); | |
2593 | } | |
2594 | #endif /* CONFIG_PROC_FS */ | |
2595 | ||
2596 | #ifdef CONFIG_COMPAT | |
2597 | static int do_siocgstamp(struct net *net, struct socket *sock, | |
2598 | unsigned int cmd, void __user *up) | |
2599 | { | |
2600 | mm_segment_t old_fs = get_fs(); | |
2601 | struct timeval ktv; | |
2602 | int err; | |
2603 | ||
2604 | set_fs(KERNEL_DS); | |
2605 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); | |
2606 | set_fs(old_fs); | |
2607 | if (!err) | |
2608 | err = compat_put_timeval(&ktv, up); | |
2609 | ||
2610 | return err; | |
2611 | } | |
2612 | ||
2613 | static int do_siocgstampns(struct net *net, struct socket *sock, | |
2614 | unsigned int cmd, void __user *up) | |
2615 | { | |
2616 | mm_segment_t old_fs = get_fs(); | |
2617 | struct timespec kts; | |
2618 | int err; | |
2619 | ||
2620 | set_fs(KERNEL_DS); | |
2621 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); | |
2622 | set_fs(old_fs); | |
2623 | if (!err) | |
2624 | err = compat_put_timespec(&kts, up); | |
2625 | ||
2626 | return err; | |
2627 | } | |
2628 | ||
2629 | static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) | |
2630 | { | |
2631 | struct ifreq __user *uifr; | |
2632 | int err; | |
2633 | ||
2634 | uifr = compat_alloc_user_space(sizeof(struct ifreq)); | |
2635 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) | |
2636 | return -EFAULT; | |
2637 | ||
2638 | err = dev_ioctl(net, SIOCGIFNAME, uifr); | |
2639 | if (err) | |
2640 | return err; | |
2641 | ||
2642 | if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) | |
2643 | return -EFAULT; | |
2644 | ||
2645 | return 0; | |
2646 | } | |
2647 | ||
2648 | static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) | |
2649 | { | |
2650 | struct compat_ifconf ifc32; | |
2651 | struct ifconf ifc; | |
2652 | struct ifconf __user *uifc; | |
2653 | struct compat_ifreq __user *ifr32; | |
2654 | struct ifreq __user *ifr; | |
2655 | unsigned int i, j; | |
2656 | int err; | |
2657 | ||
2658 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) | |
2659 | return -EFAULT; | |
2660 | ||
2661 | memset(&ifc, 0, sizeof(ifc)); | |
2662 | if (ifc32.ifcbuf == 0) { | |
2663 | ifc32.ifc_len = 0; | |
2664 | ifc.ifc_len = 0; | |
2665 | ifc.ifc_req = NULL; | |
2666 | uifc = compat_alloc_user_space(sizeof(struct ifconf)); | |
2667 | } else { | |
2668 | size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * | |
2669 | sizeof(struct ifreq); | |
2670 | uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); | |
2671 | ifc.ifc_len = len; | |
2672 | ifr = ifc.ifc_req = (void __user *)(uifc + 1); | |
2673 | ifr32 = compat_ptr(ifc32.ifcbuf); | |
2674 | for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { | |
2675 | if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) | |
2676 | return -EFAULT; | |
2677 | ifr++; | |
2678 | ifr32++; | |
2679 | } | |
2680 | } | |
2681 | if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) | |
2682 | return -EFAULT; | |
2683 | ||
2684 | err = dev_ioctl(net, SIOCGIFCONF, uifc); | |
2685 | if (err) | |
2686 | return err; | |
2687 | ||
2688 | if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) | |
2689 | return -EFAULT; | |
2690 | ||
2691 | ifr = ifc.ifc_req; | |
2692 | ifr32 = compat_ptr(ifc32.ifcbuf); | |
2693 | for (i = 0, j = 0; | |
2694 | i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; | |
2695 | i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { | |
2696 | if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) | |
2697 | return -EFAULT; | |
2698 | ifr32++; | |
2699 | ifr++; | |
2700 | } | |
2701 | ||
2702 | if (ifc32.ifcbuf == 0) { | |
2703 | /* Translate from 64-bit structure multiple to | |
2704 | * a 32-bit one. | |
2705 | */ | |
2706 | i = ifc.ifc_len; | |
2707 | i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); | |
2708 | ifc32.ifc_len = i; | |
2709 | } else { | |
2710 | ifc32.ifc_len = i; | |
2711 | } | |
2712 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) | |
2713 | return -EFAULT; | |
2714 | ||
2715 | return 0; | |
2716 | } | |
2717 | ||
2718 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) | |
2719 | { | |
2720 | struct compat_ethtool_rxnfc __user *compat_rxnfc; | |
2721 | bool convert_in = false, convert_out = false; | |
2722 | size_t buf_size = ALIGN(sizeof(struct ifreq), 8); | |
2723 | struct ethtool_rxnfc __user *rxnfc; | |
2724 | struct ifreq __user *ifr; | |
2725 | u32 rule_cnt = 0, actual_rule_cnt; | |
2726 | u32 ethcmd; | |
2727 | u32 data; | |
2728 | int ret; | |
2729 | ||
2730 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) | |
2731 | return -EFAULT; | |
2732 | ||
2733 | compat_rxnfc = compat_ptr(data); | |
2734 | ||
2735 | if (get_user(ethcmd, &compat_rxnfc->cmd)) | |
2736 | return -EFAULT; | |
2737 | ||
2738 | /* Most ethtool structures are defined without padding. | |
2739 | * Unfortunately struct ethtool_rxnfc is an exception. | |
2740 | */ | |
2741 | switch (ethcmd) { | |
2742 | default: | |
2743 | break; | |
2744 | case ETHTOOL_GRXCLSRLALL: | |
2745 | /* Buffer size is variable */ | |
2746 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) | |
2747 | return -EFAULT; | |
2748 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) | |
2749 | return -ENOMEM; | |
2750 | buf_size += rule_cnt * sizeof(u32); | |
2751 | /* fall through */ | |
2752 | case ETHTOOL_GRXRINGS: | |
2753 | case ETHTOOL_GRXCLSRLCNT: | |
2754 | case ETHTOOL_GRXCLSRULE: | |
2755 | case ETHTOOL_SRXCLSRLINS: | |
2756 | convert_out = true; | |
2757 | /* fall through */ | |
2758 | case ETHTOOL_SRXCLSRLDEL: | |
2759 | buf_size += sizeof(struct ethtool_rxnfc); | |
2760 | convert_in = true; | |
2761 | break; | |
2762 | } | |
2763 | ||
2764 | ifr = compat_alloc_user_space(buf_size); | |
2765 | rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); | |
2766 | ||
2767 | if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) | |
2768 | return -EFAULT; | |
2769 | ||
2770 | if (put_user(convert_in ? rxnfc : compat_ptr(data), | |
2771 | &ifr->ifr_ifru.ifru_data)) | |
2772 | return -EFAULT; | |
2773 | ||
2774 | if (convert_in) { | |
2775 | /* We expect there to be holes between fs.m_ext and | |
2776 | * fs.ring_cookie and at the end of fs, but nowhere else. | |
2777 | */ | |
2778 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + | |
2779 | sizeof(compat_rxnfc->fs.m_ext) != | |
2780 | offsetof(struct ethtool_rxnfc, fs.m_ext) + | |
2781 | sizeof(rxnfc->fs.m_ext)); | |
2782 | BUILD_BUG_ON( | |
2783 | offsetof(struct compat_ethtool_rxnfc, fs.location) - | |
2784 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != | |
2785 | offsetof(struct ethtool_rxnfc, fs.location) - | |
2786 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); | |
2787 | ||
2788 | if (copy_in_user(rxnfc, compat_rxnfc, | |
2789 | (void __user *)(&rxnfc->fs.m_ext + 1) - | |
2790 | (void __user *)rxnfc) || | |
2791 | copy_in_user(&rxnfc->fs.ring_cookie, | |
2792 | &compat_rxnfc->fs.ring_cookie, | |
2793 | (void __user *)(&rxnfc->fs.location + 1) - | |
2794 | (void __user *)&rxnfc->fs.ring_cookie) || | |
2795 | copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, | |
2796 | sizeof(rxnfc->rule_cnt))) | |
2797 | return -EFAULT; | |
2798 | } | |
2799 | ||
2800 | ret = dev_ioctl(net, SIOCETHTOOL, ifr); | |
2801 | if (ret) | |
2802 | return ret; | |
2803 | ||
2804 | if (convert_out) { | |
2805 | if (copy_in_user(compat_rxnfc, rxnfc, | |
2806 | (const void __user *)(&rxnfc->fs.m_ext + 1) - | |
2807 | (const void __user *)rxnfc) || | |
2808 | copy_in_user(&compat_rxnfc->fs.ring_cookie, | |
2809 | &rxnfc->fs.ring_cookie, | |
2810 | (const void __user *)(&rxnfc->fs.location + 1) - | |
2811 | (const void __user *)&rxnfc->fs.ring_cookie) || | |
2812 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, | |
2813 | sizeof(rxnfc->rule_cnt))) | |
2814 | return -EFAULT; | |
2815 | ||
2816 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
2817 | /* As an optimisation, we only copy the actual | |
2818 | * number of rules that the underlying | |
2819 | * function returned. Since Mallory might | |
2820 | * change the rule count in user memory, we | |
2821 | * check that it is less than the rule count | |
2822 | * originally given (as the user buffer size), | |
2823 | * which has been range-checked. | |
2824 | */ | |
2825 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) | |
2826 | return -EFAULT; | |
2827 | if (actual_rule_cnt < rule_cnt) | |
2828 | rule_cnt = actual_rule_cnt; | |
2829 | if (copy_in_user(&compat_rxnfc->rule_locs[0], | |
2830 | &rxnfc->rule_locs[0], | |
2831 | rule_cnt * sizeof(u32))) | |
2832 | return -EFAULT; | |
2833 | } | |
2834 | } | |
2835 | ||
2836 | return 0; | |
2837 | } | |
2838 | ||
2839 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) | |
2840 | { | |
2841 | void __user *uptr; | |
2842 | compat_uptr_t uptr32; | |
2843 | struct ifreq __user *uifr; | |
2844 | ||
2845 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
2846 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) | |
2847 | return -EFAULT; | |
2848 | ||
2849 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
2850 | return -EFAULT; | |
2851 | ||
2852 | uptr = compat_ptr(uptr32); | |
2853 | ||
2854 | if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) | |
2855 | return -EFAULT; | |
2856 | ||
2857 | return dev_ioctl(net, SIOCWANDEV, uifr); | |
2858 | } | |
2859 | ||
2860 | static int bond_ioctl(struct net *net, unsigned int cmd, | |
2861 | struct compat_ifreq __user *ifr32) | |
2862 | { | |
2863 | struct ifreq kifr; | |
2864 | mm_segment_t old_fs; | |
2865 | int err; | |
2866 | ||
2867 | switch (cmd) { | |
2868 | case SIOCBONDENSLAVE: | |
2869 | case SIOCBONDRELEASE: | |
2870 | case SIOCBONDSETHWADDR: | |
2871 | case SIOCBONDCHANGEACTIVE: | |
2872 | if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) | |
2873 | return -EFAULT; | |
2874 | ||
2875 | old_fs = get_fs(); | |
2876 | set_fs(KERNEL_DS); | |
2877 | err = dev_ioctl(net, cmd, | |
2878 | (struct ifreq __user __force *) &kifr); | |
2879 | set_fs(old_fs); | |
2880 | ||
2881 | return err; | |
2882 | default: | |
2883 | return -ENOIOCTLCMD; | |
2884 | } | |
2885 | } | |
2886 | ||
2887 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ | |
2888 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
2889 | struct compat_ifreq __user *u_ifreq32) | |
2890 | { | |
2891 | struct ifreq __user *u_ifreq64; | |
2892 | char tmp_buf[IFNAMSIZ]; | |
2893 | void __user *data64; | |
2894 | u32 data32; | |
2895 | ||
2896 | if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), | |
2897 | IFNAMSIZ)) | |
2898 | return -EFAULT; | |
2899 | if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) | |
2900 | return -EFAULT; | |
2901 | data64 = compat_ptr(data32); | |
2902 | ||
2903 | u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); | |
2904 | ||
2905 | if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], | |
2906 | IFNAMSIZ)) | |
2907 | return -EFAULT; | |
2908 | if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) | |
2909 | return -EFAULT; | |
2910 | ||
2911 | return dev_ioctl(net, cmd, u_ifreq64); | |
2912 | } | |
2913 | ||
2914 | static int dev_ifsioc(struct net *net, struct socket *sock, | |
2915 | unsigned int cmd, struct compat_ifreq __user *uifr32) | |
2916 | { | |
2917 | struct ifreq __user *uifr; | |
2918 | int err; | |
2919 | ||
2920 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
2921 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) | |
2922 | return -EFAULT; | |
2923 | ||
2924 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); | |
2925 | ||
2926 | if (!err) { | |
2927 | switch (cmd) { | |
2928 | case SIOCGIFFLAGS: | |
2929 | case SIOCGIFMETRIC: | |
2930 | case SIOCGIFMTU: | |
2931 | case SIOCGIFMEM: | |
2932 | case SIOCGIFHWADDR: | |
2933 | case SIOCGIFINDEX: | |
2934 | case SIOCGIFADDR: | |
2935 | case SIOCGIFBRDADDR: | |
2936 | case SIOCGIFDSTADDR: | |
2937 | case SIOCGIFNETMASK: | |
2938 | case SIOCGIFPFLAGS: | |
2939 | case SIOCGIFTXQLEN: | |
2940 | case SIOCGMIIPHY: | |
2941 | case SIOCGMIIREG: | |
2942 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) | |
2943 | err = -EFAULT; | |
2944 | break; | |
2945 | } | |
2946 | } | |
2947 | return err; | |
2948 | } | |
2949 | ||
2950 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, | |
2951 | struct compat_ifreq __user *uifr32) | |
2952 | { | |
2953 | struct ifreq ifr; | |
2954 | struct compat_ifmap __user *uifmap32; | |
2955 | mm_segment_t old_fs; | |
2956 | int err; | |
2957 | ||
2958 | uifmap32 = &uifr32->ifr_ifru.ifru_map; | |
2959 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); | |
2960 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); | |
2961 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
2962 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
2963 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); | |
2964 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); | |
2965 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); | |
2966 | if (err) | |
2967 | return -EFAULT; | |
2968 | ||
2969 | old_fs = get_fs(); | |
2970 | set_fs(KERNEL_DS); | |
2971 | err = dev_ioctl(net, cmd, (void __user __force *)&ifr); | |
2972 | set_fs(old_fs); | |
2973 | ||
2974 | if (cmd == SIOCGIFMAP && !err) { | |
2975 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); | |
2976 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); | |
2977 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
2978 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
2979 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); | |
2980 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); | |
2981 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); | |
2982 | if (err) | |
2983 | err = -EFAULT; | |
2984 | } | |
2985 | return err; | |
2986 | } | |
2987 | ||
2988 | struct rtentry32 { | |
2989 | u32 rt_pad1; | |
2990 | struct sockaddr rt_dst; /* target address */ | |
2991 | struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ | |
2992 | struct sockaddr rt_genmask; /* target network mask (IP) */ | |
2993 | unsigned short rt_flags; | |
2994 | short rt_pad2; | |
2995 | u32 rt_pad3; | |
2996 | unsigned char rt_tos; | |
2997 | unsigned char rt_class; | |
2998 | short rt_pad4; | |
2999 | short rt_metric; /* +1 for binary compatibility! */ | |
3000 | /* char * */ u32 rt_dev; /* forcing the device at add */ | |
3001 | u32 rt_mtu; /* per route MTU/Window */ | |
3002 | u32 rt_window; /* Window clamping */ | |
3003 | unsigned short rt_irtt; /* Initial RTT */ | |
3004 | }; | |
3005 | ||
3006 | struct in6_rtmsg32 { | |
3007 | struct in6_addr rtmsg_dst; | |
3008 | struct in6_addr rtmsg_src; | |
3009 | struct in6_addr rtmsg_gateway; | |
3010 | u32 rtmsg_type; | |
3011 | u16 rtmsg_dst_len; | |
3012 | u16 rtmsg_src_len; | |
3013 | u32 rtmsg_metric; | |
3014 | u32 rtmsg_info; | |
3015 | u32 rtmsg_flags; | |
3016 | s32 rtmsg_ifindex; | |
3017 | }; | |
3018 | ||
3019 | static int routing_ioctl(struct net *net, struct socket *sock, | |
3020 | unsigned int cmd, void __user *argp) | |
3021 | { | |
3022 | int ret; | |
3023 | void *r = NULL; | |
3024 | struct in6_rtmsg r6; | |
3025 | struct rtentry r4; | |
3026 | char devname[16]; | |
3027 | u32 rtdev; | |
3028 | mm_segment_t old_fs = get_fs(); | |
3029 | ||
3030 | if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ | |
3031 | struct in6_rtmsg32 __user *ur6 = argp; | |
3032 | ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), | |
3033 | 3 * sizeof(struct in6_addr)); | |
3034 | ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); | |
3035 | ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); | |
3036 | ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); | |
3037 | ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); | |
3038 | ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); | |
3039 | ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); | |
3040 | ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); | |
3041 | ||
3042 | r = (void *) &r6; | |
3043 | } else { /* ipv4 */ | |
3044 | struct rtentry32 __user *ur4 = argp; | |
3045 | ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), | |
3046 | 3 * sizeof(struct sockaddr)); | |
3047 | ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); | |
3048 | ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); | |
3049 | ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); | |
3050 | ret |= get_user(r4.rt_window, &(ur4->rt_window)); | |
3051 | ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); | |
3052 | ret |= get_user(rtdev, &(ur4->rt_dev)); | |
3053 | if (rtdev) { | |
3054 | ret |= copy_from_user(devname, compat_ptr(rtdev), 15); | |
3055 | r4.rt_dev = (char __user __force *)devname; | |
3056 | devname[15] = 0; | |
3057 | } else | |
3058 | r4.rt_dev = NULL; | |
3059 | ||
3060 | r = (void *) &r4; | |
3061 | } | |
3062 | ||
3063 | if (ret) { | |
3064 | ret = -EFAULT; | |
3065 | goto out; | |
3066 | } | |
3067 | ||
3068 | set_fs(KERNEL_DS); | |
3069 | ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); | |
3070 | set_fs(old_fs); | |
3071 | ||
3072 | out: | |
3073 | return ret; | |
3074 | } | |
3075 | ||
3076 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE | |
3077 | * for some operations; this forces use of the newer bridge-utils that | |
3078 | * use compatible ioctls | |
3079 | */ | |
3080 | static int old_bridge_ioctl(compat_ulong_t __user *argp) | |
3081 | { | |
3082 | compat_ulong_t tmp; | |
3083 | ||
3084 | if (get_user(tmp, argp)) | |
3085 | return -EFAULT; | |
3086 | if (tmp == BRCTL_GET_VERSION) | |
3087 | return BRCTL_VERSION + 1; | |
3088 | return -EINVAL; | |
3089 | } | |
3090 | ||
3091 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, | |
3092 | unsigned int cmd, unsigned long arg) | |
3093 | { | |
3094 | void __user *argp = compat_ptr(arg); | |
3095 | struct sock *sk = sock->sk; | |
3096 | struct net *net = sock_net(sk); | |
3097 | ||
3098 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) | |
3099 | return compat_ifr_data_ioctl(net, cmd, argp); | |
3100 | ||
3101 | switch (cmd) { | |
3102 | case SIOCSIFBR: | |
3103 | case SIOCGIFBR: | |
3104 | return old_bridge_ioctl(argp); | |
3105 | case SIOCGIFNAME: | |
3106 | return dev_ifname32(net, argp); | |
3107 | case SIOCGIFCONF: | |
3108 | return dev_ifconf(net, argp); | |
3109 | case SIOCETHTOOL: | |
3110 | return ethtool_ioctl(net, argp); | |
3111 | case SIOCWANDEV: | |
3112 | return compat_siocwandev(net, argp); | |
3113 | case SIOCGIFMAP: | |
3114 | case SIOCSIFMAP: | |
3115 | return compat_sioc_ifmap(net, cmd, argp); | |
3116 | case SIOCBONDENSLAVE: | |
3117 | case SIOCBONDRELEASE: | |
3118 | case SIOCBONDSETHWADDR: | |
3119 | case SIOCBONDCHANGEACTIVE: | |
3120 | return bond_ioctl(net, cmd, argp); | |
3121 | case SIOCADDRT: | |
3122 | case SIOCDELRT: | |
3123 | return routing_ioctl(net, sock, cmd, argp); | |
3124 | case SIOCGSTAMP: | |
3125 | return do_siocgstamp(net, sock, cmd, argp); | |
3126 | case SIOCGSTAMPNS: | |
3127 | return do_siocgstampns(net, sock, cmd, argp); | |
3128 | case SIOCBONDSLAVEINFOQUERY: | |
3129 | case SIOCBONDINFOQUERY: | |
3130 | case SIOCSHWTSTAMP: | |
3131 | case SIOCGHWTSTAMP: | |
3132 | return compat_ifr_data_ioctl(net, cmd, argp); | |
3133 | ||
3134 | case FIOSETOWN: | |
3135 | case SIOCSPGRP: | |
3136 | case FIOGETOWN: | |
3137 | case SIOCGPGRP: | |
3138 | case SIOCBRADDBR: | |
3139 | case SIOCBRDELBR: | |
3140 | case SIOCGIFVLAN: | |
3141 | case SIOCSIFVLAN: | |
3142 | case SIOCADDDLCI: | |
3143 | case SIOCDELDLCI: | |
3144 | case SIOCGSKNS: | |
3145 | return sock_ioctl(file, cmd, arg); | |
3146 | ||
3147 | case SIOCGIFFLAGS: | |
3148 | case SIOCSIFFLAGS: | |
3149 | case SIOCGIFMETRIC: | |
3150 | case SIOCSIFMETRIC: | |
3151 | case SIOCGIFMTU: | |
3152 | case SIOCSIFMTU: | |
3153 | case SIOCGIFMEM: | |
3154 | case SIOCSIFMEM: | |
3155 | case SIOCGIFHWADDR: | |
3156 | case SIOCSIFHWADDR: | |
3157 | case SIOCADDMULTI: | |
3158 | case SIOCDELMULTI: | |
3159 | case SIOCGIFINDEX: | |
3160 | case SIOCGIFADDR: | |
3161 | case SIOCSIFADDR: | |
3162 | case SIOCSIFHWBROADCAST: | |
3163 | case SIOCDIFADDR: | |
3164 | case SIOCGIFBRDADDR: | |
3165 | case SIOCSIFBRDADDR: | |
3166 | case SIOCGIFDSTADDR: | |
3167 | case SIOCSIFDSTADDR: | |
3168 | case SIOCGIFNETMASK: | |
3169 | case SIOCSIFNETMASK: | |
3170 | case SIOCSIFPFLAGS: | |
3171 | case SIOCGIFPFLAGS: | |
3172 | case SIOCGIFTXQLEN: | |
3173 | case SIOCSIFTXQLEN: | |
3174 | case SIOCBRADDIF: | |
3175 | case SIOCBRDELIF: | |
3176 | case SIOCSIFNAME: | |
3177 | case SIOCGMIIPHY: | |
3178 | case SIOCGMIIREG: | |
3179 | case SIOCSMIIREG: | |
3180 | return dev_ifsioc(net, sock, cmd, argp); | |
3181 | ||
3182 | case SIOCSARP: | |
3183 | case SIOCGARP: | |
3184 | case SIOCDARP: | |
3185 | case SIOCATMARK: | |
3186 | return sock_do_ioctl(net, sock, cmd, arg); | |
3187 | } | |
3188 | ||
3189 | return -ENOIOCTLCMD; | |
3190 | } | |
3191 | ||
3192 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, | |
3193 | unsigned long arg) | |
3194 | { | |
3195 | struct socket *sock = file->private_data; | |
3196 | int ret = -ENOIOCTLCMD; | |
3197 | struct sock *sk; | |
3198 | struct net *net; | |
3199 | ||
3200 | sk = sock->sk; | |
3201 | net = sock_net(sk); | |
3202 | ||
3203 | if (sock->ops->compat_ioctl) | |
3204 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3205 | ||
3206 | if (ret == -ENOIOCTLCMD && | |
3207 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3208 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3209 | ||
3210 | if (ret == -ENOIOCTLCMD) | |
3211 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3212 | ||
3213 | return ret; | |
3214 | } | |
3215 | #endif | |
3216 | ||
3217 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) | |
3218 | { | |
3219 | return sock->ops->bind(sock, addr, addrlen); | |
3220 | } | |
3221 | EXPORT_SYMBOL(kernel_bind); | |
3222 | ||
3223 | int kernel_listen(struct socket *sock, int backlog) | |
3224 | { | |
3225 | return sock->ops->listen(sock, backlog); | |
3226 | } | |
3227 | EXPORT_SYMBOL(kernel_listen); | |
3228 | ||
3229 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
3230 | { | |
3231 | struct sock *sk = sock->sk; | |
3232 | int err; | |
3233 | ||
3234 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3235 | newsock); | |
3236 | if (err < 0) | |
3237 | goto done; | |
3238 | ||
3239 | err = sock->ops->accept(sock, *newsock, flags); | |
3240 | if (err < 0) { | |
3241 | sock_release(*newsock); | |
3242 | *newsock = NULL; | |
3243 | goto done; | |
3244 | } | |
3245 | ||
3246 | (*newsock)->ops = sock->ops; | |
3247 | __module_get((*newsock)->ops->owner); | |
3248 | ||
3249 | done: | |
3250 | return err; | |
3251 | } | |
3252 | EXPORT_SYMBOL(kernel_accept); | |
3253 | ||
3254 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
3255 | int flags) | |
3256 | { | |
3257 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3258 | } | |
3259 | EXPORT_SYMBOL(kernel_connect); | |
3260 | ||
3261 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
3262 | int *addrlen) | |
3263 | { | |
3264 | return sock->ops->getname(sock, addr, addrlen, 0); | |
3265 | } | |
3266 | EXPORT_SYMBOL(kernel_getsockname); | |
3267 | ||
3268 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
3269 | int *addrlen) | |
3270 | { | |
3271 | return sock->ops->getname(sock, addr, addrlen, 1); | |
3272 | } | |
3273 | EXPORT_SYMBOL(kernel_getpeername); | |
3274 | ||
3275 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
3276 | char *optval, int *optlen) | |
3277 | { | |
3278 | mm_segment_t oldfs = get_fs(); | |
3279 | char __user *uoptval; | |
3280 | int __user *uoptlen; | |
3281 | int err; | |
3282 | ||
3283 | uoptval = (char __user __force *) optval; | |
3284 | uoptlen = (int __user __force *) optlen; | |
3285 | ||
3286 | set_fs(KERNEL_DS); | |
3287 | if (level == SOL_SOCKET) | |
3288 | err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); | |
3289 | else | |
3290 | err = sock->ops->getsockopt(sock, level, optname, uoptval, | |
3291 | uoptlen); | |
3292 | set_fs(oldfs); | |
3293 | return err; | |
3294 | } | |
3295 | EXPORT_SYMBOL(kernel_getsockopt); | |
3296 | ||
3297 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
3298 | char *optval, unsigned int optlen) | |
3299 | { | |
3300 | mm_segment_t oldfs = get_fs(); | |
3301 | char __user *uoptval; | |
3302 | int err; | |
3303 | ||
3304 | uoptval = (char __user __force *) optval; | |
3305 | ||
3306 | set_fs(KERNEL_DS); | |
3307 | if (level == SOL_SOCKET) | |
3308 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); | |
3309 | else | |
3310 | err = sock->ops->setsockopt(sock, level, optname, uoptval, | |
3311 | optlen); | |
3312 | set_fs(oldfs); | |
3313 | return err; | |
3314 | } | |
3315 | EXPORT_SYMBOL(kernel_setsockopt); | |
3316 | ||
3317 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
3318 | size_t size, int flags) | |
3319 | { | |
3320 | if (sock->ops->sendpage) | |
3321 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
3322 | ||
3323 | return sock_no_sendpage(sock, page, offset, size, flags); | |
3324 | } | |
3325 | EXPORT_SYMBOL(kernel_sendpage); | |
3326 | ||
3327 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
3328 | { | |
3329 | mm_segment_t oldfs = get_fs(); | |
3330 | int err; | |
3331 | ||
3332 | set_fs(KERNEL_DS); | |
3333 | err = sock->ops->ioctl(sock, cmd, arg); | |
3334 | set_fs(oldfs); | |
3335 | ||
3336 | return err; | |
3337 | } | |
3338 | EXPORT_SYMBOL(kernel_sock_ioctl); | |
3339 | ||
3340 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) | |
3341 | { | |
3342 | return sock->ops->shutdown(sock, how); | |
3343 | } | |
3344 | EXPORT_SYMBOL(kernel_sock_shutdown); |