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1 | /* | |
2 | * NET An implementation of the SOCKET network access protocol. | |
3 | * | |
4 | * Version: @(#)socket.c 1.1.93 18/02/95 | |
5 | * | |
6 | * Authors: Orest Zborowski, <obz@Kodak.COM> | |
7 | * Ross Biro | |
8 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> | |
9 | * | |
10 | * Fixes: | |
11 | * Anonymous : NOTSOCK/BADF cleanup. Error fix in | |
12 | * shutdown() | |
13 | * Alan Cox : verify_area() fixes | |
14 | * Alan Cox : Removed DDI | |
15 | * Jonathan Kamens : SOCK_DGRAM reconnect bug | |
16 | * Alan Cox : Moved a load of checks to the very | |
17 | * top level. | |
18 | * Alan Cox : Move address structures to/from user | |
19 | * mode above the protocol layers. | |
20 | * Rob Janssen : Allow 0 length sends. | |
21 | * Alan Cox : Asynchronous I/O support (cribbed from the | |
22 | * tty drivers). | |
23 | * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) | |
24 | * Jeff Uphoff : Made max number of sockets command-line | |
25 | * configurable. | |
26 | * Matti Aarnio : Made the number of sockets dynamic, | |
27 | * to be allocated when needed, and mr. | |
28 | * Uphoff's max is used as max to be | |
29 | * allowed to allocate. | |
30 | * Linus : Argh. removed all the socket allocation | |
31 | * altogether: it's in the inode now. | |
32 | * Alan Cox : Made sock_alloc()/sock_release() public | |
33 | * for NetROM and future kernel nfsd type | |
34 | * stuff. | |
35 | * Alan Cox : sendmsg/recvmsg basics. | |
36 | * Tom Dyas : Export net symbols. | |
37 | * Marcin Dalecki : Fixed problems with CONFIG_NET="n". | |
38 | * Alan Cox : Added thread locking to sys_* calls | |
39 | * for sockets. May have errors at the | |
40 | * moment. | |
41 | * Kevin Buhr : Fixed the dumb errors in the above. | |
42 | * Andi Kleen : Some small cleanups, optimizations, | |
43 | * and fixed a copy_from_user() bug. | |
44 | * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) | |
45 | * Tigran Aivazian : Made listen(2) backlog sanity checks | |
46 | * protocol-independent | |
47 | * | |
48 | * | |
49 | * This program is free software; you can redistribute it and/or | |
50 | * modify it under the terms of the GNU General Public License | |
51 | * as published by the Free Software Foundation; either version | |
52 | * 2 of the License, or (at your option) any later version. | |
53 | * | |
54 | * | |
55 | * This module is effectively the top level interface to the BSD socket | |
56 | * paradigm. | |
57 | * | |
58 | * Based upon Swansea University Computer Society NET3.039 | |
59 | */ | |
60 | ||
61 | #include <linux/mm.h> | |
62 | #include <linux/socket.h> | |
63 | #include <linux/file.h> | |
64 | #include <linux/net.h> | |
65 | #include <linux/interrupt.h> | |
66 | #include <linux/thread_info.h> | |
67 | #include <linux/rcupdate.h> | |
68 | #include <linux/netdevice.h> | |
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
71 | #include <linux/mutex.h> | |
72 | #include <linux/if_bridge.h> | |
73 | #include <linux/if_frad.h> | |
74 | #include <linux/if_vlan.h> | |
75 | #include <linux/ptp_classify.h> | |
76 | #include <linux/init.h> | |
77 | #include <linux/poll.h> | |
78 | #include <linux/cache.h> | |
79 | #include <linux/module.h> | |
80 | #include <linux/highmem.h> | |
81 | #include <linux/mount.h> | |
82 | #include <linux/security.h> | |
83 | #include <linux/syscalls.h> | |
84 | #include <linux/compat.h> | |
85 | #include <linux/kmod.h> | |
86 | #include <linux/audit.h> | |
87 | #include <linux/wireless.h> | |
88 | #include <linux/nsproxy.h> | |
89 | #include <linux/magic.h> | |
90 | #include <linux/slab.h> | |
91 | #include <linux/xattr.h> | |
92 | ||
93 | #include <asm/uaccess.h> | |
94 | #include <asm/unistd.h> | |
95 | ||
96 | #include <net/compat.h> | |
97 | #include <net/wext.h> | |
98 | #include <net/cls_cgroup.h> | |
99 | ||
100 | #include <net/sock.h> | |
101 | #include <linux/netfilter.h> | |
102 | ||
103 | #include <linux/if_tun.h> | |
104 | #include <linux/ipv6_route.h> | |
105 | #include <linux/route.h> | |
106 | #include <linux/sockios.h> | |
107 | #include <linux/atalk.h> | |
108 | #include <net/busy_poll.h> | |
109 | #include <linux/errqueue.h> | |
110 | ||
111 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
112 | unsigned int sysctl_net_busy_read __read_mostly; | |
113 | unsigned int sysctl_net_busy_poll __read_mostly; | |
114 | #endif | |
115 | ||
116 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); | |
117 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); | |
118 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); | |
119 | ||
120 | static int sock_close(struct inode *inode, struct file *file); | |
121 | static unsigned int sock_poll(struct file *file, | |
122 | struct poll_table_struct *wait); | |
123 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); | |
124 | #ifdef CONFIG_COMPAT | |
125 | static long compat_sock_ioctl(struct file *file, | |
126 | unsigned int cmd, unsigned long arg); | |
127 | #endif | |
128 | static int sock_fasync(int fd, struct file *filp, int on); | |
129 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
130 | int offset, size_t size, loff_t *ppos, int more); | |
131 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, | |
132 | struct pipe_inode_info *pipe, size_t len, | |
133 | unsigned int flags); | |
134 | ||
135 | /* | |
136 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
137 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
138 | */ | |
139 | ||
140 | static const struct file_operations socket_file_ops = { | |
141 | .owner = THIS_MODULE, | |
142 | .llseek = no_llseek, | |
143 | .read_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 struct dentry *sockfs_mount(struct file_system_type *fs_type, | |
324 | int flags, const char *dev_name, void *data) | |
325 | { | |
326 | return mount_pseudo(fs_type, "socket:", &sockfs_ops, | |
327 | &sockfs_dentry_operations, SOCKFS_MAGIC); | |
328 | } | |
329 | ||
330 | static struct vfsmount *sock_mnt __read_mostly; | |
331 | ||
332 | static struct file_system_type sock_fs_type = { | |
333 | .name = "sockfs", | |
334 | .mount = sockfs_mount, | |
335 | .kill_sb = kill_anon_super, | |
336 | }; | |
337 | ||
338 | /* | |
339 | * Obtains the first available file descriptor and sets it up for use. | |
340 | * | |
341 | * These functions create file structures and maps them to fd space | |
342 | * of the current process. On success it returns file descriptor | |
343 | * and file struct implicitly stored in sock->file. | |
344 | * Note that another thread may close file descriptor before we return | |
345 | * from this function. We use the fact that now we do not refer | |
346 | * to socket after mapping. If one day we will need it, this | |
347 | * function will increment ref. count on file by 1. | |
348 | * | |
349 | * In any case returned fd MAY BE not valid! | |
350 | * This race condition is unavoidable | |
351 | * with shared fd spaces, we cannot solve it inside kernel, | |
352 | * but we take care of internal coherence yet. | |
353 | */ | |
354 | ||
355 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) | |
356 | { | |
357 | struct qstr name = { .name = "" }; | |
358 | struct path path; | |
359 | struct file *file; | |
360 | ||
361 | if (dname) { | |
362 | name.name = dname; | |
363 | name.len = strlen(name.name); | |
364 | } else if (sock->sk) { | |
365 | name.name = sock->sk->sk_prot_creator->name; | |
366 | name.len = strlen(name.name); | |
367 | } | |
368 | path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); | |
369 | if (unlikely(!path.dentry)) | |
370 | return ERR_PTR(-ENOMEM); | |
371 | path.mnt = mntget(sock_mnt); | |
372 | ||
373 | d_instantiate(path.dentry, SOCK_INODE(sock)); | |
374 | ||
375 | file = alloc_file(&path, FMODE_READ | FMODE_WRITE, | |
376 | &socket_file_ops); | |
377 | if (IS_ERR(file)) { | |
378 | /* drop dentry, keep inode */ | |
379 | ihold(d_inode(path.dentry)); | |
380 | path_put(&path); | |
381 | return file; | |
382 | } | |
383 | ||
384 | sock->file = file; | |
385 | file->f_flags = O_RDWR | (flags & O_NONBLOCK); | |
386 | file->private_data = sock; | |
387 | return file; | |
388 | } | |
389 | EXPORT_SYMBOL(sock_alloc_file); | |
390 | ||
391 | static int sock_map_fd(struct socket *sock, int flags) | |
392 | { | |
393 | struct file *newfile; | |
394 | int fd = get_unused_fd_flags(flags); | |
395 | if (unlikely(fd < 0)) | |
396 | return fd; | |
397 | ||
398 | newfile = sock_alloc_file(sock, flags, NULL); | |
399 | if (likely(!IS_ERR(newfile))) { | |
400 | fd_install(fd, newfile); | |
401 | return fd; | |
402 | } | |
403 | ||
404 | put_unused_fd(fd); | |
405 | return PTR_ERR(newfile); | |
406 | } | |
407 | ||
408 | struct socket *sock_from_file(struct file *file, int *err) | |
409 | { | |
410 | if (file->f_op == &socket_file_ops) | |
411 | return file->private_data; /* set in sock_map_fd */ | |
412 | ||
413 | *err = -ENOTSOCK; | |
414 | return NULL; | |
415 | } | |
416 | EXPORT_SYMBOL(sock_from_file); | |
417 | ||
418 | /** | |
419 | * sockfd_lookup - Go from a file number to its socket slot | |
420 | * @fd: file handle | |
421 | * @err: pointer to an error code return | |
422 | * | |
423 | * The file handle passed in is locked and the socket it is bound | |
424 | * too is returned. If an error occurs the err pointer is overwritten | |
425 | * with a negative errno code and NULL is returned. The function checks | |
426 | * for both invalid handles and passing a handle which is not a socket. | |
427 | * | |
428 | * On a success the socket object pointer is returned. | |
429 | */ | |
430 | ||
431 | struct socket *sockfd_lookup(int fd, int *err) | |
432 | { | |
433 | struct file *file; | |
434 | struct socket *sock; | |
435 | ||
436 | file = fget(fd); | |
437 | if (!file) { | |
438 | *err = -EBADF; | |
439 | return NULL; | |
440 | } | |
441 | ||
442 | sock = sock_from_file(file, err); | |
443 | if (!sock) | |
444 | fput(file); | |
445 | return sock; | |
446 | } | |
447 | EXPORT_SYMBOL(sockfd_lookup); | |
448 | ||
449 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) | |
450 | { | |
451 | struct fd f = fdget(fd); | |
452 | struct socket *sock; | |
453 | ||
454 | *err = -EBADF; | |
455 | if (f.file) { | |
456 | sock = sock_from_file(f.file, err); | |
457 | if (likely(sock)) { | |
458 | *fput_needed = f.flags; | |
459 | return sock; | |
460 | } | |
461 | fdput(f); | |
462 | } | |
463 | return NULL; | |
464 | } | |
465 | ||
466 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
467 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
468 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
469 | static ssize_t sockfs_getxattr(struct dentry *dentry, struct inode *inode, | |
470 | const char *name, void *value, size_t size) | |
471 | { | |
472 | const char *proto_name; | |
473 | size_t proto_size; | |
474 | int error; | |
475 | ||
476 | error = -ENODATA; | |
477 | if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) { | |
478 | proto_name = dentry->d_name.name; | |
479 | proto_size = strlen(proto_name); | |
480 | ||
481 | if (value) { | |
482 | error = -ERANGE; | |
483 | if (proto_size + 1 > size) | |
484 | goto out; | |
485 | ||
486 | strncpy(value, proto_name, proto_size + 1); | |
487 | } | |
488 | error = proto_size + 1; | |
489 | } | |
490 | ||
491 | out: | |
492 | return error; | |
493 | } | |
494 | ||
495 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, | |
496 | size_t size) | |
497 | { | |
498 | ssize_t len; | |
499 | ssize_t used = 0; | |
500 | ||
501 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); | |
502 | if (len < 0) | |
503 | return len; | |
504 | used += len; | |
505 | if (buffer) { | |
506 | if (size < used) | |
507 | return -ERANGE; | |
508 | buffer += len; | |
509 | } | |
510 | ||
511 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
512 | used += len; | |
513 | if (buffer) { | |
514 | if (size < used) | |
515 | return -ERANGE; | |
516 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
517 | buffer += len; | |
518 | } | |
519 | ||
520 | return used; | |
521 | } | |
522 | ||
523 | static const struct inode_operations sockfs_inode_ops = { | |
524 | .getxattr = sockfs_getxattr, | |
525 | .listxattr = sockfs_listxattr, | |
526 | }; | |
527 | ||
528 | /** | |
529 | * sock_alloc - allocate a socket | |
530 | * | |
531 | * Allocate a new inode and socket object. The two are bound together | |
532 | * and initialised. The socket is then returned. If we are out of inodes | |
533 | * NULL is returned. | |
534 | */ | |
535 | ||
536 | struct socket *sock_alloc(void) | |
537 | { | |
538 | struct inode *inode; | |
539 | struct socket *sock; | |
540 | ||
541 | inode = new_inode_pseudo(sock_mnt->mnt_sb); | |
542 | if (!inode) | |
543 | return NULL; | |
544 | ||
545 | sock = SOCKET_I(inode); | |
546 | ||
547 | kmemcheck_annotate_bitfield(sock, type); | |
548 | inode->i_ino = get_next_ino(); | |
549 | inode->i_mode = S_IFSOCK | S_IRWXUGO; | |
550 | inode->i_uid = current_fsuid(); | |
551 | inode->i_gid = current_fsgid(); | |
552 | inode->i_op = &sockfs_inode_ops; | |
553 | ||
554 | this_cpu_add(sockets_in_use, 1); | |
555 | return sock; | |
556 | } | |
557 | EXPORT_SYMBOL(sock_alloc); | |
558 | ||
559 | /** | |
560 | * sock_release - close a socket | |
561 | * @sock: socket to close | |
562 | * | |
563 | * The socket is released from the protocol stack if it has a release | |
564 | * callback, and the inode is then released if the socket is bound to | |
565 | * an inode not a file. | |
566 | */ | |
567 | ||
568 | void sock_release(struct socket *sock) | |
569 | { | |
570 | if (sock->ops) { | |
571 | struct module *owner = sock->ops->owner; | |
572 | ||
573 | sock->ops->release(sock); | |
574 | sock->ops = NULL; | |
575 | module_put(owner); | |
576 | } | |
577 | ||
578 | if (rcu_dereference_protected(sock->wq, 1)->fasync_list) | |
579 | pr_err("%s: fasync list not empty!\n", __func__); | |
580 | ||
581 | this_cpu_sub(sockets_in_use, 1); | |
582 | if (!sock->file) { | |
583 | iput(SOCK_INODE(sock)); | |
584 | return; | |
585 | } | |
586 | sock->file = NULL; | |
587 | } | |
588 | EXPORT_SYMBOL(sock_release); | |
589 | ||
590 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) | |
591 | { | |
592 | u8 flags = *tx_flags; | |
593 | ||
594 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) | |
595 | flags |= SKBTX_HW_TSTAMP; | |
596 | ||
597 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) | |
598 | flags |= SKBTX_SW_TSTAMP; | |
599 | ||
600 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) | |
601 | flags |= SKBTX_SCHED_TSTAMP; | |
602 | ||
603 | *tx_flags = flags; | |
604 | } | |
605 | EXPORT_SYMBOL(__sock_tx_timestamp); | |
606 | ||
607 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) | |
608 | { | |
609 | int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); | |
610 | BUG_ON(ret == -EIOCBQUEUED); | |
611 | return ret; | |
612 | } | |
613 | ||
614 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) | |
615 | { | |
616 | int err = security_socket_sendmsg(sock, msg, | |
617 | msg_data_left(msg)); | |
618 | ||
619 | return err ?: sock_sendmsg_nosec(sock, msg); | |
620 | } | |
621 | EXPORT_SYMBOL(sock_sendmsg); | |
622 | ||
623 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
624 | struct kvec *vec, size_t num, size_t size) | |
625 | { | |
626 | iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); | |
627 | return sock_sendmsg(sock, msg); | |
628 | } | |
629 | EXPORT_SYMBOL(kernel_sendmsg); | |
630 | ||
631 | /* | |
632 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
633 | */ | |
634 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
635 | struct sk_buff *skb) | |
636 | { | |
637 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); | |
638 | struct scm_timestamping tss; | |
639 | int empty = 1; | |
640 | struct skb_shared_hwtstamps *shhwtstamps = | |
641 | skb_hwtstamps(skb); | |
642 | ||
643 | /* Race occurred between timestamp enabling and packet | |
644 | receiving. Fill in the current time for now. */ | |
645 | if (need_software_tstamp && skb->tstamp.tv64 == 0) | |
646 | __net_timestamp(skb); | |
647 | ||
648 | if (need_software_tstamp) { | |
649 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
650 | struct timeval tv; | |
651 | skb_get_timestamp(skb, &tv); | |
652 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, | |
653 | sizeof(tv), &tv); | |
654 | } else { | |
655 | struct timespec ts; | |
656 | skb_get_timestampns(skb, &ts); | |
657 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, | |
658 | sizeof(ts), &ts); | |
659 | } | |
660 | } | |
661 | ||
662 | memset(&tss, 0, sizeof(tss)); | |
663 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && | |
664 | ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) | |
665 | empty = 0; | |
666 | if (shhwtstamps && | |
667 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && | |
668 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) | |
669 | empty = 0; | |
670 | if (!empty) | |
671 | put_cmsg(msg, SOL_SOCKET, | |
672 | SCM_TIMESTAMPING, sizeof(tss), &tss); | |
673 | } | |
674 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); | |
675 | ||
676 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
677 | struct sk_buff *skb) | |
678 | { | |
679 | int ack; | |
680 | ||
681 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
682 | return; | |
683 | if (!skb->wifi_acked_valid) | |
684 | return; | |
685 | ||
686 | ack = skb->wifi_acked; | |
687 | ||
688 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
689 | } | |
690 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
691 | ||
692 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, | |
693 | struct sk_buff *skb) | |
694 | { | |
695 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) | |
696 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, | |
697 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); | |
698 | } | |
699 | ||
700 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
701 | struct sk_buff *skb) | |
702 | { | |
703 | sock_recv_timestamp(msg, sk, skb); | |
704 | sock_recv_drops(msg, sk, skb); | |
705 | } | |
706 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); | |
707 | ||
708 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, | |
709 | int flags) | |
710 | { | |
711 | return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); | |
712 | } | |
713 | ||
714 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) | |
715 | { | |
716 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); | |
717 | ||
718 | return err ?: sock_recvmsg_nosec(sock, msg, flags); | |
719 | } | |
720 | EXPORT_SYMBOL(sock_recvmsg); | |
721 | ||
722 | /** | |
723 | * kernel_recvmsg - Receive a message from a socket (kernel space) | |
724 | * @sock: The socket to receive the message from | |
725 | * @msg: Received message | |
726 | * @vec: Input s/g array for message data | |
727 | * @num: Size of input s/g array | |
728 | * @size: Number of bytes to read | |
729 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
730 | * | |
731 | * On return the msg structure contains the scatter/gather array passed in the | |
732 | * vec argument. The array is modified so that it consists of the unfilled | |
733 | * portion of the original array. | |
734 | * | |
735 | * The returned value is the total number of bytes received, or an error. | |
736 | */ | |
737 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, | |
738 | struct kvec *vec, size_t num, size_t size, int flags) | |
739 | { | |
740 | mm_segment_t oldfs = get_fs(); | |
741 | int result; | |
742 | ||
743 | iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); | |
744 | set_fs(KERNEL_DS); | |
745 | result = sock_recvmsg(sock, msg, flags); | |
746 | set_fs(oldfs); | |
747 | return result; | |
748 | } | |
749 | EXPORT_SYMBOL(kernel_recvmsg); | |
750 | ||
751 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
752 | int offset, size_t size, loff_t *ppos, int more) | |
753 | { | |
754 | struct socket *sock; | |
755 | int flags; | |
756 | ||
757 | sock = file->private_data; | |
758 | ||
759 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
760 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
761 | flags |= more; | |
762 | ||
763 | return kernel_sendpage(sock, page, offset, size, flags); | |
764 | } | |
765 | ||
766 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, | |
767 | struct pipe_inode_info *pipe, size_t len, | |
768 | unsigned int flags) | |
769 | { | |
770 | struct socket *sock = file->private_data; | |
771 | ||
772 | if (unlikely(!sock->ops->splice_read)) | |
773 | return -EINVAL; | |
774 | ||
775 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); | |
776 | } | |
777 | ||
778 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) | |
779 | { | |
780 | struct file *file = iocb->ki_filp; | |
781 | struct socket *sock = file->private_data; | |
782 | struct msghdr msg = {.msg_iter = *to, | |
783 | .msg_iocb = iocb}; | |
784 | ssize_t res; | |
785 | ||
786 | if (file->f_flags & O_NONBLOCK) | |
787 | msg.msg_flags = MSG_DONTWAIT; | |
788 | ||
789 | if (iocb->ki_pos != 0) | |
790 | return -ESPIPE; | |
791 | ||
792 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ | |
793 | return 0; | |
794 | ||
795 | res = sock_recvmsg(sock, &msg, msg.msg_flags); | |
796 | *to = msg.msg_iter; | |
797 | return res; | |
798 | } | |
799 | ||
800 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) | |
801 | { | |
802 | struct file *file = iocb->ki_filp; | |
803 | struct socket *sock = file->private_data; | |
804 | struct msghdr msg = {.msg_iter = *from, | |
805 | .msg_iocb = iocb}; | |
806 | ssize_t res; | |
807 | ||
808 | if (iocb->ki_pos != 0) | |
809 | return -ESPIPE; | |
810 | ||
811 | if (file->f_flags & O_NONBLOCK) | |
812 | msg.msg_flags = MSG_DONTWAIT; | |
813 | ||
814 | if (sock->type == SOCK_SEQPACKET) | |
815 | msg.msg_flags |= MSG_EOR; | |
816 | ||
817 | res = sock_sendmsg(sock, &msg); | |
818 | *from = msg.msg_iter; | |
819 | return res; | |
820 | } | |
821 | ||
822 | /* | |
823 | * Atomic setting of ioctl hooks to avoid race | |
824 | * with module unload. | |
825 | */ | |
826 | ||
827 | static DEFINE_MUTEX(br_ioctl_mutex); | |
828 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); | |
829 | ||
830 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) | |
831 | { | |
832 | mutex_lock(&br_ioctl_mutex); | |
833 | br_ioctl_hook = hook; | |
834 | mutex_unlock(&br_ioctl_mutex); | |
835 | } | |
836 | EXPORT_SYMBOL(brioctl_set); | |
837 | ||
838 | static DEFINE_MUTEX(vlan_ioctl_mutex); | |
839 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); | |
840 | ||
841 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) | |
842 | { | |
843 | mutex_lock(&vlan_ioctl_mutex); | |
844 | vlan_ioctl_hook = hook; | |
845 | mutex_unlock(&vlan_ioctl_mutex); | |
846 | } | |
847 | EXPORT_SYMBOL(vlan_ioctl_set); | |
848 | ||
849 | static DEFINE_MUTEX(dlci_ioctl_mutex); | |
850 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); | |
851 | ||
852 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) | |
853 | { | |
854 | mutex_lock(&dlci_ioctl_mutex); | |
855 | dlci_ioctl_hook = hook; | |
856 | mutex_unlock(&dlci_ioctl_mutex); | |
857 | } | |
858 | EXPORT_SYMBOL(dlci_ioctl_set); | |
859 | ||
860 | static long sock_do_ioctl(struct net *net, struct socket *sock, | |
861 | unsigned int cmd, unsigned long arg) | |
862 | { | |
863 | int err; | |
864 | void __user *argp = (void __user *)arg; | |
865 | ||
866 | err = sock->ops->ioctl(sock, cmd, arg); | |
867 | ||
868 | /* | |
869 | * If this ioctl is unknown try to hand it down | |
870 | * to the NIC driver. | |
871 | */ | |
872 | if (err == -ENOIOCTLCMD) | |
873 | err = dev_ioctl(net, cmd, argp); | |
874 | ||
875 | return err; | |
876 | } | |
877 | ||
878 | /* | |
879 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
880 | * what to do with it - that's up to the protocol still. | |
881 | */ | |
882 | ||
883 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
884 | { | |
885 | struct socket *sock; | |
886 | struct sock *sk; | |
887 | void __user *argp = (void __user *)arg; | |
888 | int pid, err; | |
889 | struct net *net; | |
890 | ||
891 | sock = file->private_data; | |
892 | sk = sock->sk; | |
893 | net = sock_net(sk); | |
894 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { | |
895 | err = dev_ioctl(net, cmd, argp); | |
896 | } else | |
897 | #ifdef CONFIG_WEXT_CORE | |
898 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { | |
899 | err = dev_ioctl(net, cmd, argp); | |
900 | } else | |
901 | #endif | |
902 | switch (cmd) { | |
903 | case FIOSETOWN: | |
904 | case SIOCSPGRP: | |
905 | err = -EFAULT; | |
906 | if (get_user(pid, (int __user *)argp)) | |
907 | break; | |
908 | f_setown(sock->file, pid, 1); | |
909 | err = 0; | |
910 | break; | |
911 | case FIOGETOWN: | |
912 | case SIOCGPGRP: | |
913 | err = put_user(f_getown(sock->file), | |
914 | (int __user *)argp); | |
915 | break; | |
916 | case SIOCGIFBR: | |
917 | case SIOCSIFBR: | |
918 | case SIOCBRADDBR: | |
919 | case SIOCBRDELBR: | |
920 | err = -ENOPKG; | |
921 | if (!br_ioctl_hook) | |
922 | request_module("bridge"); | |
923 | ||
924 | mutex_lock(&br_ioctl_mutex); | |
925 | if (br_ioctl_hook) | |
926 | err = br_ioctl_hook(net, cmd, argp); | |
927 | mutex_unlock(&br_ioctl_mutex); | |
928 | break; | |
929 | case SIOCGIFVLAN: | |
930 | case SIOCSIFVLAN: | |
931 | err = -ENOPKG; | |
932 | if (!vlan_ioctl_hook) | |
933 | request_module("8021q"); | |
934 | ||
935 | mutex_lock(&vlan_ioctl_mutex); | |
936 | if (vlan_ioctl_hook) | |
937 | err = vlan_ioctl_hook(net, argp); | |
938 | mutex_unlock(&vlan_ioctl_mutex); | |
939 | break; | |
940 | case SIOCADDDLCI: | |
941 | case SIOCDELDLCI: | |
942 | err = -ENOPKG; | |
943 | if (!dlci_ioctl_hook) | |
944 | request_module("dlci"); | |
945 | ||
946 | mutex_lock(&dlci_ioctl_mutex); | |
947 | if (dlci_ioctl_hook) | |
948 | err = dlci_ioctl_hook(cmd, argp); | |
949 | mutex_unlock(&dlci_ioctl_mutex); | |
950 | break; | |
951 | default: | |
952 | err = sock_do_ioctl(net, sock, cmd, arg); | |
953 | break; | |
954 | } | |
955 | return err; | |
956 | } | |
957 | ||
958 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
959 | { | |
960 | int err; | |
961 | struct socket *sock = NULL; | |
962 | ||
963 | err = security_socket_create(family, type, protocol, 1); | |
964 | if (err) | |
965 | goto out; | |
966 | ||
967 | sock = sock_alloc(); | |
968 | if (!sock) { | |
969 | err = -ENOMEM; | |
970 | goto out; | |
971 | } | |
972 | ||
973 | sock->type = type; | |
974 | err = security_socket_post_create(sock, family, type, protocol, 1); | |
975 | if (err) | |
976 | goto out_release; | |
977 | ||
978 | out: | |
979 | *res = sock; | |
980 | return err; | |
981 | out_release: | |
982 | sock_release(sock); | |
983 | sock = NULL; | |
984 | goto out; | |
985 | } | |
986 | EXPORT_SYMBOL(sock_create_lite); | |
987 | ||
988 | /* No kernel lock held - perfect */ | |
989 | static unsigned int sock_poll(struct file *file, poll_table *wait) | |
990 | { | |
991 | unsigned int busy_flag = 0; | |
992 | struct socket *sock; | |
993 | ||
994 | /* | |
995 | * We can't return errors to poll, so it's either yes or no. | |
996 | */ | |
997 | sock = file->private_data; | |
998 | ||
999 | if (sk_can_busy_loop(sock->sk)) { | |
1000 | /* this socket can poll_ll so tell the system call */ | |
1001 | busy_flag = POLL_BUSY_LOOP; | |
1002 | ||
1003 | /* once, only if requested by syscall */ | |
1004 | if (wait && (wait->_key & POLL_BUSY_LOOP)) | |
1005 | sk_busy_loop(sock->sk, 1); | |
1006 | } | |
1007 | ||
1008 | return busy_flag | sock->ops->poll(file, sock, wait); | |
1009 | } | |
1010 | ||
1011 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) | |
1012 | { | |
1013 | struct socket *sock = file->private_data; | |
1014 | ||
1015 | return sock->ops->mmap(file, sock, vma); | |
1016 | } | |
1017 | ||
1018 | static int sock_close(struct inode *inode, struct file *filp) | |
1019 | { | |
1020 | sock_release(SOCKET_I(inode)); | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Update the socket async list | |
1026 | * | |
1027 | * Fasync_list locking strategy. | |
1028 | * | |
1029 | * 1. fasync_list is modified only under process context socket lock | |
1030 | * i.e. under semaphore. | |
1031 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
1032 | * or under socket lock | |
1033 | */ | |
1034 | ||
1035 | static int sock_fasync(int fd, struct file *filp, int on) | |
1036 | { | |
1037 | struct socket *sock = filp->private_data; | |
1038 | struct sock *sk = sock->sk; | |
1039 | struct socket_wq *wq; | |
1040 | ||
1041 | if (sk == NULL) | |
1042 | return -EINVAL; | |
1043 | ||
1044 | lock_sock(sk); | |
1045 | wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk)); | |
1046 | fasync_helper(fd, filp, on, &wq->fasync_list); | |
1047 | ||
1048 | if (!wq->fasync_list) | |
1049 | sock_reset_flag(sk, SOCK_FASYNC); | |
1050 | else | |
1051 | sock_set_flag(sk, SOCK_FASYNC); | |
1052 | ||
1053 | release_sock(sk); | |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | /* This function may be called only under rcu_lock */ | |
1058 | ||
1059 | int sock_wake_async(struct socket_wq *wq, int how, int band) | |
1060 | { | |
1061 | if (!wq || !wq->fasync_list) | |
1062 | return -1; | |
1063 | ||
1064 | switch (how) { | |
1065 | case SOCK_WAKE_WAITD: | |
1066 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) | |
1067 | break; | |
1068 | goto call_kill; | |
1069 | case SOCK_WAKE_SPACE: | |
1070 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) | |
1071 | break; | |
1072 | /* fall through */ | |
1073 | case SOCK_WAKE_IO: | |
1074 | call_kill: | |
1075 | kill_fasync(&wq->fasync_list, SIGIO, band); | |
1076 | break; | |
1077 | case SOCK_WAKE_URG: | |
1078 | kill_fasync(&wq->fasync_list, SIGURG, band); | |
1079 | } | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | EXPORT_SYMBOL(sock_wake_async); | |
1084 | ||
1085 | int __sock_create(struct net *net, int family, int type, int protocol, | |
1086 | struct socket **res, int kern) | |
1087 | { | |
1088 | int err; | |
1089 | struct socket *sock; | |
1090 | const struct net_proto_family *pf; | |
1091 | ||
1092 | /* | |
1093 | * Check protocol is in range | |
1094 | */ | |
1095 | if (family < 0 || family >= NPROTO) | |
1096 | return -EAFNOSUPPORT; | |
1097 | if (type < 0 || type >= SOCK_MAX) | |
1098 | return -EINVAL; | |
1099 | ||
1100 | /* Compatibility. | |
1101 | ||
1102 | This uglymoron is moved from INET layer to here to avoid | |
1103 | deadlock in module load. | |
1104 | */ | |
1105 | if (family == PF_INET && type == SOCK_PACKET) { | |
1106 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", | |
1107 | current->comm); | |
1108 | family = PF_PACKET; | |
1109 | } | |
1110 | ||
1111 | err = security_socket_create(family, type, protocol, kern); | |
1112 | if (err) | |
1113 | return err; | |
1114 | ||
1115 | /* | |
1116 | * Allocate the socket and allow the family to set things up. if | |
1117 | * the protocol is 0, the family is instructed to select an appropriate | |
1118 | * default. | |
1119 | */ | |
1120 | sock = sock_alloc(); | |
1121 | if (!sock) { | |
1122 | net_warn_ratelimited("socket: no more sockets\n"); | |
1123 | return -ENFILE; /* Not exactly a match, but its the | |
1124 | closest posix thing */ | |
1125 | } | |
1126 | ||
1127 | sock->type = type; | |
1128 | ||
1129 | #ifdef CONFIG_MODULES | |
1130 | /* Attempt to load a protocol module if the find failed. | |
1131 | * | |
1132 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1133 | * requested real, full-featured networking support upon configuration. | |
1134 | * Otherwise module support will break! | |
1135 | */ | |
1136 | if (rcu_access_pointer(net_families[family]) == NULL) | |
1137 | request_module("net-pf-%d", family); | |
1138 | #endif | |
1139 | ||
1140 | rcu_read_lock(); | |
1141 | pf = rcu_dereference(net_families[family]); | |
1142 | err = -EAFNOSUPPORT; | |
1143 | if (!pf) | |
1144 | goto out_release; | |
1145 | ||
1146 | /* | |
1147 | * We will call the ->create function, that possibly is in a loadable | |
1148 | * module, so we have to bump that loadable module refcnt first. | |
1149 | */ | |
1150 | if (!try_module_get(pf->owner)) | |
1151 | goto out_release; | |
1152 | ||
1153 | /* Now protected by module ref count */ | |
1154 | rcu_read_unlock(); | |
1155 | ||
1156 | err = pf->create(net, sock, protocol, kern); | |
1157 | if (err < 0) | |
1158 | goto out_module_put; | |
1159 | ||
1160 | /* | |
1161 | * Now to bump the refcnt of the [loadable] module that owns this | |
1162 | * socket at sock_release time we decrement its refcnt. | |
1163 | */ | |
1164 | if (!try_module_get(sock->ops->owner)) | |
1165 | goto out_module_busy; | |
1166 | ||
1167 | /* | |
1168 | * Now that we're done with the ->create function, the [loadable] | |
1169 | * module can have its refcnt decremented | |
1170 | */ | |
1171 | module_put(pf->owner); | |
1172 | err = security_socket_post_create(sock, family, type, protocol, kern); | |
1173 | if (err) | |
1174 | goto out_sock_release; | |
1175 | *res = sock; | |
1176 | ||
1177 | return 0; | |
1178 | ||
1179 | out_module_busy: | |
1180 | err = -EAFNOSUPPORT; | |
1181 | out_module_put: | |
1182 | sock->ops = NULL; | |
1183 | module_put(pf->owner); | |
1184 | out_sock_release: | |
1185 | sock_release(sock); | |
1186 | return err; | |
1187 | ||
1188 | out_release: | |
1189 | rcu_read_unlock(); | |
1190 | goto out_sock_release; | |
1191 | } | |
1192 | EXPORT_SYMBOL(__sock_create); | |
1193 | ||
1194 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1195 | { | |
1196 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); | |
1197 | } | |
1198 | EXPORT_SYMBOL(sock_create); | |
1199 | ||
1200 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) | |
1201 | { | |
1202 | return __sock_create(net, family, type, protocol, res, 1); | |
1203 | } | |
1204 | EXPORT_SYMBOL(sock_create_kern); | |
1205 | ||
1206 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) | |
1207 | { | |
1208 | int retval; | |
1209 | struct socket *sock; | |
1210 | int flags; | |
1211 | ||
1212 | /* Check the SOCK_* constants for consistency. */ | |
1213 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1214 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1215 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1216 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1217 | ||
1218 | flags = type & ~SOCK_TYPE_MASK; | |
1219 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1220 | return -EINVAL; | |
1221 | type &= SOCK_TYPE_MASK; | |
1222 | ||
1223 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1224 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1225 | ||
1226 | retval = sock_create(family, type, protocol, &sock); | |
1227 | if (retval < 0) | |
1228 | goto out; | |
1229 | ||
1230 | retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); | |
1231 | if (retval < 0) | |
1232 | goto out_release; | |
1233 | ||
1234 | out: | |
1235 | /* It may be already another descriptor 8) Not kernel problem. */ | |
1236 | return retval; | |
1237 | ||
1238 | out_release: | |
1239 | sock_release(sock); | |
1240 | return retval; | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * Create a pair of connected sockets. | |
1245 | */ | |
1246 | ||
1247 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, | |
1248 | int __user *, usockvec) | |
1249 | { | |
1250 | struct socket *sock1, *sock2; | |
1251 | int fd1, fd2, err; | |
1252 | struct file *newfile1, *newfile2; | |
1253 | int flags; | |
1254 | ||
1255 | flags = type & ~SOCK_TYPE_MASK; | |
1256 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1257 | return -EINVAL; | |
1258 | type &= SOCK_TYPE_MASK; | |
1259 | ||
1260 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1261 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1262 | ||
1263 | /* | |
1264 | * Obtain the first socket and check if the underlying protocol | |
1265 | * supports the socketpair call. | |
1266 | */ | |
1267 | ||
1268 | err = sock_create(family, type, protocol, &sock1); | |
1269 | if (err < 0) | |
1270 | goto out; | |
1271 | ||
1272 | err = sock_create(family, type, protocol, &sock2); | |
1273 | if (err < 0) | |
1274 | goto out_release_1; | |
1275 | ||
1276 | err = sock1->ops->socketpair(sock1, sock2); | |
1277 | if (err < 0) | |
1278 | goto out_release_both; | |
1279 | ||
1280 | fd1 = get_unused_fd_flags(flags); | |
1281 | if (unlikely(fd1 < 0)) { | |
1282 | err = fd1; | |
1283 | goto out_release_both; | |
1284 | } | |
1285 | ||
1286 | fd2 = get_unused_fd_flags(flags); | |
1287 | if (unlikely(fd2 < 0)) { | |
1288 | err = fd2; | |
1289 | goto out_put_unused_1; | |
1290 | } | |
1291 | ||
1292 | newfile1 = sock_alloc_file(sock1, flags, NULL); | |
1293 | if (IS_ERR(newfile1)) { | |
1294 | err = PTR_ERR(newfile1); | |
1295 | goto out_put_unused_both; | |
1296 | } | |
1297 | ||
1298 | newfile2 = sock_alloc_file(sock2, flags, NULL); | |
1299 | if (IS_ERR(newfile2)) { | |
1300 | err = PTR_ERR(newfile2); | |
1301 | goto out_fput_1; | |
1302 | } | |
1303 | ||
1304 | err = put_user(fd1, &usockvec[0]); | |
1305 | if (err) | |
1306 | goto out_fput_both; | |
1307 | ||
1308 | err = put_user(fd2, &usockvec[1]); | |
1309 | if (err) | |
1310 | goto out_fput_both; | |
1311 | ||
1312 | audit_fd_pair(fd1, fd2); | |
1313 | ||
1314 | fd_install(fd1, newfile1); | |
1315 | fd_install(fd2, newfile2); | |
1316 | /* fd1 and fd2 may be already another descriptors. | |
1317 | * Not kernel problem. | |
1318 | */ | |
1319 | ||
1320 | return 0; | |
1321 | ||
1322 | out_fput_both: | |
1323 | fput(newfile2); | |
1324 | fput(newfile1); | |
1325 | put_unused_fd(fd2); | |
1326 | put_unused_fd(fd1); | |
1327 | goto out; | |
1328 | ||
1329 | out_fput_1: | |
1330 | fput(newfile1); | |
1331 | put_unused_fd(fd2); | |
1332 | put_unused_fd(fd1); | |
1333 | sock_release(sock2); | |
1334 | goto out; | |
1335 | ||
1336 | out_put_unused_both: | |
1337 | put_unused_fd(fd2); | |
1338 | out_put_unused_1: | |
1339 | put_unused_fd(fd1); | |
1340 | out_release_both: | |
1341 | sock_release(sock2); | |
1342 | out_release_1: | |
1343 | sock_release(sock1); | |
1344 | out: | |
1345 | return err; | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * Bind a name to a socket. Nothing much to do here since it's | |
1350 | * the protocol's responsibility to handle the local address. | |
1351 | * | |
1352 | * We move the socket address to kernel space before we call | |
1353 | * the protocol layer (having also checked the address is ok). | |
1354 | */ | |
1355 | ||
1356 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) | |
1357 | { | |
1358 | struct socket *sock; | |
1359 | struct sockaddr_storage address; | |
1360 | int err, fput_needed; | |
1361 | ||
1362 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1363 | if (sock) { | |
1364 | err = move_addr_to_kernel(umyaddr, addrlen, &address); | |
1365 | if (err >= 0) { | |
1366 | err = security_socket_bind(sock, | |
1367 | (struct sockaddr *)&address, | |
1368 | addrlen); | |
1369 | if (!err) | |
1370 | err = sock->ops->bind(sock, | |
1371 | (struct sockaddr *) | |
1372 | &address, addrlen); | |
1373 | } | |
1374 | fput_light(sock->file, fput_needed); | |
1375 | } | |
1376 | return err; | |
1377 | } | |
1378 | ||
1379 | /* | |
1380 | * Perform a listen. Basically, we allow the protocol to do anything | |
1381 | * necessary for a listen, and if that works, we mark the socket as | |
1382 | * ready for listening. | |
1383 | */ | |
1384 | ||
1385 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) | |
1386 | { | |
1387 | struct socket *sock; | |
1388 | int err, fput_needed; | |
1389 | int somaxconn; | |
1390 | ||
1391 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1392 | if (sock) { | |
1393 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; | |
1394 | if ((unsigned int)backlog > somaxconn) | |
1395 | backlog = somaxconn; | |
1396 | ||
1397 | err = security_socket_listen(sock, backlog); | |
1398 | if (!err) | |
1399 | err = sock->ops->listen(sock, backlog); | |
1400 | ||
1401 | fput_light(sock->file, fput_needed); | |
1402 | } | |
1403 | return err; | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * For accept, we attempt to create a new socket, set up the link | |
1408 | * with the client, wake up the client, then return the new | |
1409 | * connected fd. We collect the address of the connector in kernel | |
1410 | * space and move it to user at the very end. This is unclean because | |
1411 | * we open the socket then return an error. | |
1412 | * | |
1413 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1414 | * status to recvmsg. We need to add that support in a way thats | |
1415 | * clean when we restucture accept also. | |
1416 | */ | |
1417 | ||
1418 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1419 | int __user *, upeer_addrlen, int, flags) | |
1420 | { | |
1421 | struct socket *sock, *newsock; | |
1422 | struct file *newfile; | |
1423 | int err, len, newfd, fput_needed; | |
1424 | struct sockaddr_storage address; | |
1425 | ||
1426 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1427 | return -EINVAL; | |
1428 | ||
1429 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1430 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1431 | ||
1432 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1433 | if (!sock) | |
1434 | goto out; | |
1435 | ||
1436 | err = -ENFILE; | |
1437 | newsock = sock_alloc(); | |
1438 | if (!newsock) | |
1439 | goto out_put; | |
1440 | ||
1441 | newsock->type = sock->type; | |
1442 | newsock->ops = sock->ops; | |
1443 | ||
1444 | /* | |
1445 | * We don't need try_module_get here, as the listening socket (sock) | |
1446 | * has the protocol module (sock->ops->owner) held. | |
1447 | */ | |
1448 | __module_get(newsock->ops->owner); | |
1449 | ||
1450 | newfd = get_unused_fd_flags(flags); | |
1451 | if (unlikely(newfd < 0)) { | |
1452 | err = newfd; | |
1453 | sock_release(newsock); | |
1454 | goto out_put; | |
1455 | } | |
1456 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); | |
1457 | if (IS_ERR(newfile)) { | |
1458 | err = PTR_ERR(newfile); | |
1459 | put_unused_fd(newfd); | |
1460 | sock_release(newsock); | |
1461 | goto out_put; | |
1462 | } | |
1463 | ||
1464 | err = security_socket_accept(sock, newsock); | |
1465 | if (err) | |
1466 | goto out_fd; | |
1467 | ||
1468 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); | |
1469 | if (err < 0) | |
1470 | goto out_fd; | |
1471 | ||
1472 | if (upeer_sockaddr) { | |
1473 | if (newsock->ops->getname(newsock, (struct sockaddr *)&address, | |
1474 | &len, 2) < 0) { | |
1475 | err = -ECONNABORTED; | |
1476 | goto out_fd; | |
1477 | } | |
1478 | err = move_addr_to_user(&address, | |
1479 | len, upeer_sockaddr, upeer_addrlen); | |
1480 | if (err < 0) | |
1481 | goto out_fd; | |
1482 | } | |
1483 | ||
1484 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1485 | ||
1486 | fd_install(newfd, newfile); | |
1487 | err = newfd; | |
1488 | ||
1489 | out_put: | |
1490 | fput_light(sock->file, fput_needed); | |
1491 | out: | |
1492 | return err; | |
1493 | out_fd: | |
1494 | fput(newfile); | |
1495 | put_unused_fd(newfd); | |
1496 | goto out_put; | |
1497 | } | |
1498 | ||
1499 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1500 | int __user *, upeer_addrlen) | |
1501 | { | |
1502 | return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); | |
1503 | } | |
1504 | ||
1505 | /* | |
1506 | * Attempt to connect to a socket with the server address. The address | |
1507 | * is in user space so we verify it is OK and move it to kernel space. | |
1508 | * | |
1509 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1510 | * break bindings | |
1511 | * | |
1512 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1513 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1514 | * include the -EINPROGRESS status for such sockets. | |
1515 | */ | |
1516 | ||
1517 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, | |
1518 | int, addrlen) | |
1519 | { | |
1520 | struct socket *sock; | |
1521 | struct sockaddr_storage address; | |
1522 | int err, fput_needed; | |
1523 | ||
1524 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1525 | if (!sock) | |
1526 | goto out; | |
1527 | err = move_addr_to_kernel(uservaddr, addrlen, &address); | |
1528 | if (err < 0) | |
1529 | goto out_put; | |
1530 | ||
1531 | err = | |
1532 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); | |
1533 | if (err) | |
1534 | goto out_put; | |
1535 | ||
1536 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, | |
1537 | sock->file->f_flags); | |
1538 | out_put: | |
1539 | fput_light(sock->file, fput_needed); | |
1540 | out: | |
1541 | return err; | |
1542 | } | |
1543 | ||
1544 | /* | |
1545 | * Get the local address ('name') of a socket object. Move the obtained | |
1546 | * name to user space. | |
1547 | */ | |
1548 | ||
1549 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, | |
1550 | int __user *, usockaddr_len) | |
1551 | { | |
1552 | struct socket *sock; | |
1553 | struct sockaddr_storage address; | |
1554 | int len, err, fput_needed; | |
1555 | ||
1556 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1557 | if (!sock) | |
1558 | goto out; | |
1559 | ||
1560 | err = security_socket_getsockname(sock); | |
1561 | if (err) | |
1562 | goto out_put; | |
1563 | ||
1564 | err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); | |
1565 | if (err) | |
1566 | goto out_put; | |
1567 | err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); | |
1568 | ||
1569 | out_put: | |
1570 | fput_light(sock->file, fput_needed); | |
1571 | out: | |
1572 | return err; | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * Get the remote address ('name') of a socket object. Move the obtained | |
1577 | * name to user space. | |
1578 | */ | |
1579 | ||
1580 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, | |
1581 | int __user *, usockaddr_len) | |
1582 | { | |
1583 | struct socket *sock; | |
1584 | struct sockaddr_storage address; | |
1585 | int len, err, fput_needed; | |
1586 | ||
1587 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1588 | if (sock != NULL) { | |
1589 | err = security_socket_getpeername(sock); | |
1590 | if (err) { | |
1591 | fput_light(sock->file, fput_needed); | |
1592 | return err; | |
1593 | } | |
1594 | ||
1595 | err = | |
1596 | sock->ops->getname(sock, (struct sockaddr *)&address, &len, | |
1597 | 1); | |
1598 | if (!err) | |
1599 | err = move_addr_to_user(&address, len, usockaddr, | |
1600 | usockaddr_len); | |
1601 | fput_light(sock->file, fput_needed); | |
1602 | } | |
1603 | return err; | |
1604 | } | |
1605 | ||
1606 | /* | |
1607 | * Send a datagram to a given address. We move the address into kernel | |
1608 | * space and check the user space data area is readable before invoking | |
1609 | * the protocol. | |
1610 | */ | |
1611 | ||
1612 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, | |
1613 | unsigned int, flags, struct sockaddr __user *, addr, | |
1614 | int, addr_len) | |
1615 | { | |
1616 | struct socket *sock; | |
1617 | struct sockaddr_storage address; | |
1618 | int err; | |
1619 | struct msghdr msg; | |
1620 | struct iovec iov; | |
1621 | int fput_needed; | |
1622 | ||
1623 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); | |
1624 | if (unlikely(err)) | |
1625 | return err; | |
1626 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1627 | if (!sock) | |
1628 | goto out; | |
1629 | ||
1630 | msg.msg_name = NULL; | |
1631 | msg.msg_control = NULL; | |
1632 | msg.msg_controllen = 0; | |
1633 | msg.msg_namelen = 0; | |
1634 | if (addr) { | |
1635 | err = move_addr_to_kernel(addr, addr_len, &address); | |
1636 | if (err < 0) | |
1637 | goto out_put; | |
1638 | msg.msg_name = (struct sockaddr *)&address; | |
1639 | msg.msg_namelen = addr_len; | |
1640 | } | |
1641 | if (sock->file->f_flags & O_NONBLOCK) | |
1642 | flags |= MSG_DONTWAIT; | |
1643 | msg.msg_flags = flags; | |
1644 | err = sock_sendmsg(sock, &msg); | |
1645 | ||
1646 | out_put: | |
1647 | fput_light(sock->file, fput_needed); | |
1648 | out: | |
1649 | return err; | |
1650 | } | |
1651 | ||
1652 | /* | |
1653 | * Send a datagram down a socket. | |
1654 | */ | |
1655 | ||
1656 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, | |
1657 | unsigned int, flags) | |
1658 | { | |
1659 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1660 | } | |
1661 | ||
1662 | /* | |
1663 | * Receive a frame from the socket and optionally record the address of the | |
1664 | * sender. We verify the buffers are writable and if needed move the | |
1665 | * sender address from kernel to user space. | |
1666 | */ | |
1667 | ||
1668 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, | |
1669 | unsigned int, flags, struct sockaddr __user *, addr, | |
1670 | int __user *, addr_len) | |
1671 | { | |
1672 | struct socket *sock; | |
1673 | struct iovec iov; | |
1674 | struct msghdr msg; | |
1675 | struct sockaddr_storage address; | |
1676 | int err, err2; | |
1677 | int fput_needed; | |
1678 | ||
1679 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); | |
1680 | if (unlikely(err)) | |
1681 | return err; | |
1682 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1683 | if (!sock) | |
1684 | goto out; | |
1685 | ||
1686 | msg.msg_control = NULL; | |
1687 | msg.msg_controllen = 0; | |
1688 | /* Save some cycles and don't copy the address if not needed */ | |
1689 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; | |
1690 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
1691 | msg.msg_namelen = 0; | |
1692 | msg.msg_iocb = NULL; | |
1693 | if (sock->file->f_flags & O_NONBLOCK) | |
1694 | flags |= MSG_DONTWAIT; | |
1695 | err = sock_recvmsg(sock, &msg, flags); | |
1696 | ||
1697 | if (err >= 0 && addr != NULL) { | |
1698 | err2 = move_addr_to_user(&address, | |
1699 | msg.msg_namelen, addr, addr_len); | |
1700 | if (err2 < 0) | |
1701 | err = err2; | |
1702 | } | |
1703 | ||
1704 | fput_light(sock->file, fput_needed); | |
1705 | out: | |
1706 | return err; | |
1707 | } | |
1708 | ||
1709 | /* | |
1710 | * Receive a datagram from a socket. | |
1711 | */ | |
1712 | ||
1713 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, | |
1714 | unsigned int, flags) | |
1715 | { | |
1716 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1717 | } | |
1718 | ||
1719 | /* | |
1720 | * Set a socket option. Because we don't know the option lengths we have | |
1721 | * to pass the user mode parameter for the protocols to sort out. | |
1722 | */ | |
1723 | ||
1724 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, | |
1725 | char __user *, optval, int, optlen) | |
1726 | { | |
1727 | int err, fput_needed; | |
1728 | struct socket *sock; | |
1729 | ||
1730 | if (optlen < 0) | |
1731 | return -EINVAL; | |
1732 | ||
1733 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1734 | if (sock != NULL) { | |
1735 | err = security_socket_setsockopt(sock, level, optname); | |
1736 | if (err) | |
1737 | goto out_put; | |
1738 | ||
1739 | if (level == SOL_SOCKET) | |
1740 | err = | |
1741 | sock_setsockopt(sock, level, optname, optval, | |
1742 | optlen); | |
1743 | else | |
1744 | err = | |
1745 | sock->ops->setsockopt(sock, level, optname, optval, | |
1746 | optlen); | |
1747 | out_put: | |
1748 | fput_light(sock->file, fput_needed); | |
1749 | } | |
1750 | return err; | |
1751 | } | |
1752 | ||
1753 | /* | |
1754 | * Get a socket option. Because we don't know the option lengths we have | |
1755 | * to pass a user mode parameter for the protocols to sort out. | |
1756 | */ | |
1757 | ||
1758 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, | |
1759 | char __user *, optval, int __user *, optlen) | |
1760 | { | |
1761 | int err, fput_needed; | |
1762 | struct socket *sock; | |
1763 | ||
1764 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1765 | if (sock != NULL) { | |
1766 | err = security_socket_getsockopt(sock, level, optname); | |
1767 | if (err) | |
1768 | goto out_put; | |
1769 | ||
1770 | if (level == SOL_SOCKET) | |
1771 | err = | |
1772 | sock_getsockopt(sock, level, optname, optval, | |
1773 | optlen); | |
1774 | else | |
1775 | err = | |
1776 | sock->ops->getsockopt(sock, level, optname, optval, | |
1777 | optlen); | |
1778 | out_put: | |
1779 | fput_light(sock->file, fput_needed); | |
1780 | } | |
1781 | return err; | |
1782 | } | |
1783 | ||
1784 | /* | |
1785 | * Shutdown a socket. | |
1786 | */ | |
1787 | ||
1788 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) | |
1789 | { | |
1790 | int err, fput_needed; | |
1791 | struct socket *sock; | |
1792 | ||
1793 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1794 | if (sock != NULL) { | |
1795 | err = security_socket_shutdown(sock, how); | |
1796 | if (!err) | |
1797 | err = sock->ops->shutdown(sock, how); | |
1798 | fput_light(sock->file, fput_needed); | |
1799 | } | |
1800 | return err; | |
1801 | } | |
1802 | ||
1803 | /* A couple of helpful macros for getting the address of the 32/64 bit | |
1804 | * fields which are the same type (int / unsigned) on our platforms. | |
1805 | */ | |
1806 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1807 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1808 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1809 | ||
1810 | struct used_address { | |
1811 | struct sockaddr_storage name; | |
1812 | unsigned int name_len; | |
1813 | }; | |
1814 | ||
1815 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
1816 | struct user_msghdr __user *umsg, | |
1817 | struct sockaddr __user **save_addr, | |
1818 | struct iovec **iov) | |
1819 | { | |
1820 | struct sockaddr __user *uaddr; | |
1821 | struct iovec __user *uiov; | |
1822 | size_t nr_segs; | |
1823 | ssize_t err; | |
1824 | ||
1825 | if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || | |
1826 | __get_user(uaddr, &umsg->msg_name) || | |
1827 | __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || | |
1828 | __get_user(uiov, &umsg->msg_iov) || | |
1829 | __get_user(nr_segs, &umsg->msg_iovlen) || | |
1830 | __get_user(kmsg->msg_control, &umsg->msg_control) || | |
1831 | __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || | |
1832 | __get_user(kmsg->msg_flags, &umsg->msg_flags)) | |
1833 | return -EFAULT; | |
1834 | ||
1835 | if (!uaddr) | |
1836 | kmsg->msg_namelen = 0; | |
1837 | ||
1838 | if (kmsg->msg_namelen < 0) | |
1839 | return -EINVAL; | |
1840 | ||
1841 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) | |
1842 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); | |
1843 | ||
1844 | if (save_addr) | |
1845 | *save_addr = uaddr; | |
1846 | ||
1847 | if (uaddr && kmsg->msg_namelen) { | |
1848 | if (!save_addr) { | |
1849 | err = move_addr_to_kernel(uaddr, kmsg->msg_namelen, | |
1850 | kmsg->msg_name); | |
1851 | if (err < 0) | |
1852 | return err; | |
1853 | } | |
1854 | } else { | |
1855 | kmsg->msg_name = NULL; | |
1856 | kmsg->msg_namelen = 0; | |
1857 | } | |
1858 | ||
1859 | if (nr_segs > UIO_MAXIOV) | |
1860 | return -EMSGSIZE; | |
1861 | ||
1862 | kmsg->msg_iocb = NULL; | |
1863 | ||
1864 | return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs, | |
1865 | UIO_FASTIOV, iov, &kmsg->msg_iter); | |
1866 | } | |
1867 | ||
1868 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
1869 | struct msghdr *msg_sys, unsigned int flags, | |
1870 | struct used_address *used_address, | |
1871 | unsigned int allowed_msghdr_flags) | |
1872 | { | |
1873 | struct compat_msghdr __user *msg_compat = | |
1874 | (struct compat_msghdr __user *)msg; | |
1875 | struct sockaddr_storage address; | |
1876 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1877 | unsigned char ctl[sizeof(struct cmsghdr) + 20] | |
1878 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); | |
1879 | /* 20 is size of ipv6_pktinfo */ | |
1880 | unsigned char *ctl_buf = ctl; | |
1881 | int ctl_len; | |
1882 | ssize_t err; | |
1883 | ||
1884 | msg_sys->msg_name = &address; | |
1885 | ||
1886 | if (MSG_CMSG_COMPAT & flags) | |
1887 | err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); | |
1888 | else | |
1889 | err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); | |
1890 | if (err < 0) | |
1891 | return err; | |
1892 | ||
1893 | err = -ENOBUFS; | |
1894 | ||
1895 | if (msg_sys->msg_controllen > INT_MAX) | |
1896 | goto out_freeiov; | |
1897 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); | |
1898 | ctl_len = msg_sys->msg_controllen; | |
1899 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { | |
1900 | err = | |
1901 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, | |
1902 | sizeof(ctl)); | |
1903 | if (err) | |
1904 | goto out_freeiov; | |
1905 | ctl_buf = msg_sys->msg_control; | |
1906 | ctl_len = msg_sys->msg_controllen; | |
1907 | } else if (ctl_len) { | |
1908 | if (ctl_len > sizeof(ctl)) { | |
1909 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); | |
1910 | if (ctl_buf == NULL) | |
1911 | goto out_freeiov; | |
1912 | } | |
1913 | err = -EFAULT; | |
1914 | /* | |
1915 | * Careful! Before this, msg_sys->msg_control contains a user pointer. | |
1916 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
1917 | * checking falls down on this. | |
1918 | */ | |
1919 | if (copy_from_user(ctl_buf, | |
1920 | (void __user __force *)msg_sys->msg_control, | |
1921 | ctl_len)) | |
1922 | goto out_freectl; | |
1923 | msg_sys->msg_control = ctl_buf; | |
1924 | } | |
1925 | msg_sys->msg_flags = flags; | |
1926 | ||
1927 | if (sock->file->f_flags & O_NONBLOCK) | |
1928 | msg_sys->msg_flags |= MSG_DONTWAIT; | |
1929 | /* | |
1930 | * If this is sendmmsg() and current destination address is same as | |
1931 | * previously succeeded address, omit asking LSM's decision. | |
1932 | * used_address->name_len is initialized to UINT_MAX so that the first | |
1933 | * destination address never matches. | |
1934 | */ | |
1935 | if (used_address && msg_sys->msg_name && | |
1936 | used_address->name_len == msg_sys->msg_namelen && | |
1937 | !memcmp(&used_address->name, msg_sys->msg_name, | |
1938 | used_address->name_len)) { | |
1939 | err = sock_sendmsg_nosec(sock, msg_sys); | |
1940 | goto out_freectl; | |
1941 | } | |
1942 | err = sock_sendmsg(sock, msg_sys); | |
1943 | /* | |
1944 | * If this is sendmmsg() and sending to current destination address was | |
1945 | * successful, remember it. | |
1946 | */ | |
1947 | if (used_address && err >= 0) { | |
1948 | used_address->name_len = msg_sys->msg_namelen; | |
1949 | if (msg_sys->msg_name) | |
1950 | memcpy(&used_address->name, msg_sys->msg_name, | |
1951 | used_address->name_len); | |
1952 | } | |
1953 | ||
1954 | out_freectl: | |
1955 | if (ctl_buf != ctl) | |
1956 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); | |
1957 | out_freeiov: | |
1958 | kfree(iov); | |
1959 | return err; | |
1960 | } | |
1961 | ||
1962 | /* | |
1963 | * BSD sendmsg interface | |
1964 | */ | |
1965 | ||
1966 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) | |
1967 | { | |
1968 | int fput_needed, err; | |
1969 | struct msghdr msg_sys; | |
1970 | struct socket *sock; | |
1971 | ||
1972 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1973 | if (!sock) | |
1974 | goto out; | |
1975 | ||
1976 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); | |
1977 | ||
1978 | fput_light(sock->file, fput_needed); | |
1979 | out: | |
1980 | return err; | |
1981 | } | |
1982 | ||
1983 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) | |
1984 | { | |
1985 | if (flags & MSG_CMSG_COMPAT) | |
1986 | return -EINVAL; | |
1987 | return __sys_sendmsg(fd, msg, flags); | |
1988 | } | |
1989 | ||
1990 | /* | |
1991 | * Linux sendmmsg interface | |
1992 | */ | |
1993 | ||
1994 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
1995 | unsigned int flags) | |
1996 | { | |
1997 | int fput_needed, err, datagrams; | |
1998 | struct socket *sock; | |
1999 | struct mmsghdr __user *entry; | |
2000 | struct compat_mmsghdr __user *compat_entry; | |
2001 | struct msghdr msg_sys; | |
2002 | struct used_address used_address; | |
2003 | unsigned int oflags = flags; | |
2004 | ||
2005 | if (vlen > UIO_MAXIOV) | |
2006 | vlen = UIO_MAXIOV; | |
2007 | ||
2008 | datagrams = 0; | |
2009 | ||
2010 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2011 | if (!sock) | |
2012 | return err; | |
2013 | ||
2014 | used_address.name_len = UINT_MAX; | |
2015 | entry = mmsg; | |
2016 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
2017 | err = 0; | |
2018 | flags |= MSG_BATCH; | |
2019 | ||
2020 | while (datagrams < vlen) { | |
2021 | if (datagrams == vlen - 1) | |
2022 | flags = oflags; | |
2023 | ||
2024 | if (MSG_CMSG_COMPAT & flags) { | |
2025 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, | |
2026 | &msg_sys, flags, &used_address, MSG_EOR); | |
2027 | if (err < 0) | |
2028 | break; | |
2029 | err = __put_user(err, &compat_entry->msg_len); | |
2030 | ++compat_entry; | |
2031 | } else { | |
2032 | err = ___sys_sendmsg(sock, | |
2033 | (struct user_msghdr __user *)entry, | |
2034 | &msg_sys, flags, &used_address, MSG_EOR); | |
2035 | if (err < 0) | |
2036 | break; | |
2037 | err = put_user(err, &entry->msg_len); | |
2038 | ++entry; | |
2039 | } | |
2040 | ||
2041 | if (err) | |
2042 | break; | |
2043 | ++datagrams; | |
2044 | cond_resched(); | |
2045 | } | |
2046 | ||
2047 | fput_light(sock->file, fput_needed); | |
2048 | ||
2049 | /* We only return an error if no datagrams were able to be sent */ | |
2050 | if (datagrams != 0) | |
2051 | return datagrams; | |
2052 | ||
2053 | return err; | |
2054 | } | |
2055 | ||
2056 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2057 | unsigned int, vlen, unsigned int, flags) | |
2058 | { | |
2059 | if (flags & MSG_CMSG_COMPAT) | |
2060 | return -EINVAL; | |
2061 | return __sys_sendmmsg(fd, mmsg, vlen, flags); | |
2062 | } | |
2063 | ||
2064 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2065 | struct msghdr *msg_sys, unsigned int flags, int nosec) | |
2066 | { | |
2067 | struct compat_msghdr __user *msg_compat = | |
2068 | (struct compat_msghdr __user *)msg; | |
2069 | struct iovec iovstack[UIO_FASTIOV]; | |
2070 | struct iovec *iov = iovstack; | |
2071 | unsigned long cmsg_ptr; | |
2072 | int len; | |
2073 | ssize_t err; | |
2074 | ||
2075 | /* kernel mode address */ | |
2076 | struct sockaddr_storage addr; | |
2077 | ||
2078 | /* user mode address pointers */ | |
2079 | struct sockaddr __user *uaddr; | |
2080 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2081 | ||
2082 | msg_sys->msg_name = &addr; | |
2083 | ||
2084 | if (MSG_CMSG_COMPAT & flags) | |
2085 | err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); | |
2086 | else | |
2087 | err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); | |
2088 | if (err < 0) | |
2089 | return err; | |
2090 | ||
2091 | cmsg_ptr = (unsigned long)msg_sys->msg_control; | |
2092 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
2093 | ||
2094 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
2095 | msg_sys->msg_namelen = 0; | |
2096 | ||
2097 | if (sock->file->f_flags & O_NONBLOCK) | |
2098 | flags |= MSG_DONTWAIT; | |
2099 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); | |
2100 | if (err < 0) | |
2101 | goto out_freeiov; | |
2102 | len = err; | |
2103 | ||
2104 | if (uaddr != NULL) { | |
2105 | err = move_addr_to_user(&addr, | |
2106 | msg_sys->msg_namelen, uaddr, | |
2107 | uaddr_len); | |
2108 | if (err < 0) | |
2109 | goto out_freeiov; | |
2110 | } | |
2111 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), | |
2112 | COMPAT_FLAGS(msg)); | |
2113 | if (err) | |
2114 | goto out_freeiov; | |
2115 | if (MSG_CMSG_COMPAT & flags) | |
2116 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2117 | &msg_compat->msg_controllen); | |
2118 | else | |
2119 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2120 | &msg->msg_controllen); | |
2121 | if (err) | |
2122 | goto out_freeiov; | |
2123 | err = len; | |
2124 | ||
2125 | out_freeiov: | |
2126 | kfree(iov); | |
2127 | return err; | |
2128 | } | |
2129 | ||
2130 | /* | |
2131 | * BSD recvmsg interface | |
2132 | */ | |
2133 | ||
2134 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) | |
2135 | { | |
2136 | int fput_needed, err; | |
2137 | struct msghdr msg_sys; | |
2138 | struct socket *sock; | |
2139 | ||
2140 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2141 | if (!sock) | |
2142 | goto out; | |
2143 | ||
2144 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); | |
2145 | ||
2146 | fput_light(sock->file, fput_needed); | |
2147 | out: | |
2148 | return err; | |
2149 | } | |
2150 | ||
2151 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, | |
2152 | unsigned int, flags) | |
2153 | { | |
2154 | if (flags & MSG_CMSG_COMPAT) | |
2155 | return -EINVAL; | |
2156 | return __sys_recvmsg(fd, msg, flags); | |
2157 | } | |
2158 | ||
2159 | /* | |
2160 | * Linux recvmmsg interface | |
2161 | */ | |
2162 | ||
2163 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
2164 | unsigned int flags, struct timespec *timeout) | |
2165 | { | |
2166 | int fput_needed, err, datagrams; | |
2167 | struct socket *sock; | |
2168 | struct mmsghdr __user *entry; | |
2169 | struct compat_mmsghdr __user *compat_entry; | |
2170 | struct msghdr msg_sys; | |
2171 | struct timespec end_time; | |
2172 | ||
2173 | if (timeout && | |
2174 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2175 | timeout->tv_nsec)) | |
2176 | return -EINVAL; | |
2177 | ||
2178 | datagrams = 0; | |
2179 | ||
2180 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2181 | if (!sock) | |
2182 | return err; | |
2183 | ||
2184 | err = sock_error(sock->sk); | |
2185 | if (err) | |
2186 | goto out_put; | |
2187 | ||
2188 | entry = mmsg; | |
2189 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
2190 | ||
2191 | while (datagrams < vlen) { | |
2192 | /* | |
2193 | * No need to ask LSM for more than the first datagram. | |
2194 | */ | |
2195 | if (MSG_CMSG_COMPAT & flags) { | |
2196 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, | |
2197 | &msg_sys, flags & ~MSG_WAITFORONE, | |
2198 | datagrams); | |
2199 | if (err < 0) | |
2200 | break; | |
2201 | err = __put_user(err, &compat_entry->msg_len); | |
2202 | ++compat_entry; | |
2203 | } else { | |
2204 | err = ___sys_recvmsg(sock, | |
2205 | (struct user_msghdr __user *)entry, | |
2206 | &msg_sys, flags & ~MSG_WAITFORONE, | |
2207 | datagrams); | |
2208 | if (err < 0) | |
2209 | break; | |
2210 | err = put_user(err, &entry->msg_len); | |
2211 | ++entry; | |
2212 | } | |
2213 | ||
2214 | if (err) | |
2215 | break; | |
2216 | ++datagrams; | |
2217 | ||
2218 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ | |
2219 | if (flags & MSG_WAITFORONE) | |
2220 | flags |= MSG_DONTWAIT; | |
2221 | ||
2222 | if (timeout) { | |
2223 | ktime_get_ts(timeout); | |
2224 | *timeout = timespec_sub(end_time, *timeout); | |
2225 | if (timeout->tv_sec < 0) { | |
2226 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2227 | break; | |
2228 | } | |
2229 | ||
2230 | /* Timeout, return less than vlen datagrams */ | |
2231 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2232 | break; | |
2233 | } | |
2234 | ||
2235 | /* Out of band data, return right away */ | |
2236 | if (msg_sys.msg_flags & MSG_OOB) | |
2237 | break; | |
2238 | cond_resched(); | |
2239 | } | |
2240 | ||
2241 | if (err == 0) | |
2242 | goto out_put; | |
2243 | ||
2244 | if (datagrams == 0) { | |
2245 | datagrams = err; | |
2246 | goto out_put; | |
2247 | } | |
2248 | ||
2249 | /* | |
2250 | * We may return less entries than requested (vlen) if the | |
2251 | * sock is non block and there aren't enough datagrams... | |
2252 | */ | |
2253 | if (err != -EAGAIN) { | |
2254 | /* | |
2255 | * ... or if recvmsg returns an error after we | |
2256 | * received some datagrams, where we record the | |
2257 | * error to return on the next call or if the | |
2258 | * app asks about it using getsockopt(SO_ERROR). | |
2259 | */ | |
2260 | sock->sk->sk_err = -err; | |
2261 | } | |
2262 | out_put: | |
2263 | fput_light(sock->file, fput_needed); | |
2264 | ||
2265 | return datagrams; | |
2266 | } | |
2267 | ||
2268 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2269 | unsigned int, vlen, unsigned int, flags, | |
2270 | struct timespec __user *, timeout) | |
2271 | { | |
2272 | int datagrams; | |
2273 | struct timespec timeout_sys; | |
2274 | ||
2275 | if (flags & MSG_CMSG_COMPAT) | |
2276 | return -EINVAL; | |
2277 | ||
2278 | if (!timeout) | |
2279 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2280 | ||
2281 | if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) | |
2282 | return -EFAULT; | |
2283 | ||
2284 | datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
2285 | ||
2286 | if (datagrams > 0 && | |
2287 | copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) | |
2288 | datagrams = -EFAULT; | |
2289 | ||
2290 | return datagrams; | |
2291 | } | |
2292 | ||
2293 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
2294 | /* Argument list sizes for sys_socketcall */ | |
2295 | #define AL(x) ((x) * sizeof(unsigned long)) | |
2296 | static const unsigned char nargs[21] = { | |
2297 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), | |
2298 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2299 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
2300 | AL(4), AL(5), AL(4) | |
2301 | }; | |
2302 | ||
2303 | #undef AL | |
2304 | ||
2305 | /* | |
2306 | * System call vectors. | |
2307 | * | |
2308 | * Argument checking cleaned up. Saved 20% in size. | |
2309 | * This function doesn't need to set the kernel lock because | |
2310 | * it is set by the callees. | |
2311 | */ | |
2312 | ||
2313 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) | |
2314 | { | |
2315 | unsigned long a[AUDITSC_ARGS]; | |
2316 | unsigned long a0, a1; | |
2317 | int err; | |
2318 | unsigned int len; | |
2319 | ||
2320 | if (call < 1 || call > SYS_SENDMMSG) | |
2321 | return -EINVAL; | |
2322 | ||
2323 | len = nargs[call]; | |
2324 | if (len > sizeof(a)) | |
2325 | return -EINVAL; | |
2326 | ||
2327 | /* copy_from_user should be SMP safe. */ | |
2328 | if (copy_from_user(a, args, len)) | |
2329 | return -EFAULT; | |
2330 | ||
2331 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); | |
2332 | if (err) | |
2333 | return err; | |
2334 | ||
2335 | a0 = a[0]; | |
2336 | a1 = a[1]; | |
2337 | ||
2338 | switch (call) { | |
2339 | case SYS_SOCKET: | |
2340 | err = sys_socket(a0, a1, a[2]); | |
2341 | break; | |
2342 | case SYS_BIND: | |
2343 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2344 | break; | |
2345 | case SYS_CONNECT: | |
2346 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2347 | break; | |
2348 | case SYS_LISTEN: | |
2349 | err = sys_listen(a0, a1); | |
2350 | break; | |
2351 | case SYS_ACCEPT: | |
2352 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2353 | (int __user *)a[2], 0); | |
2354 | break; | |
2355 | case SYS_GETSOCKNAME: | |
2356 | err = | |
2357 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2358 | (int __user *)a[2]); | |
2359 | break; | |
2360 | case SYS_GETPEERNAME: | |
2361 | err = | |
2362 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2363 | (int __user *)a[2]); | |
2364 | break; | |
2365 | case SYS_SOCKETPAIR: | |
2366 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2367 | break; | |
2368 | case SYS_SEND: | |
2369 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2370 | break; | |
2371 | case SYS_SENDTO: | |
2372 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2373 | (struct sockaddr __user *)a[4], a[5]); | |
2374 | break; | |
2375 | case SYS_RECV: | |
2376 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2377 | break; | |
2378 | case SYS_RECVFROM: | |
2379 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2380 | (struct sockaddr __user *)a[4], | |
2381 | (int __user *)a[5]); | |
2382 | break; | |
2383 | case SYS_SHUTDOWN: | |
2384 | err = sys_shutdown(a0, a1); | |
2385 | break; | |
2386 | case SYS_SETSOCKOPT: | |
2387 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2388 | break; | |
2389 | case SYS_GETSOCKOPT: | |
2390 | err = | |
2391 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2392 | (int __user *)a[4]); | |
2393 | break; | |
2394 | case SYS_SENDMSG: | |
2395 | err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]); | |
2396 | break; | |
2397 | case SYS_SENDMMSG: | |
2398 | err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); | |
2399 | break; | |
2400 | case SYS_RECVMSG: | |
2401 | err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]); | |
2402 | break; | |
2403 | case SYS_RECVMMSG: | |
2404 | err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], | |
2405 | (struct timespec __user *)a[4]); | |
2406 | break; | |
2407 | case SYS_ACCEPT4: | |
2408 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2409 | (int __user *)a[2], a[3]); | |
2410 | break; | |
2411 | default: | |
2412 | err = -EINVAL; | |
2413 | break; | |
2414 | } | |
2415 | return err; | |
2416 | } | |
2417 | ||
2418 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ | |
2419 | ||
2420 | /** | |
2421 | * sock_register - add a socket protocol handler | |
2422 | * @ops: description of protocol | |
2423 | * | |
2424 | * This function is called by a protocol handler that wants to | |
2425 | * advertise its address family, and have it linked into the | |
2426 | * socket interface. The value ops->family corresponds to the | |
2427 | * socket system call protocol family. | |
2428 | */ | |
2429 | int sock_register(const struct net_proto_family *ops) | |
2430 | { | |
2431 | int err; | |
2432 | ||
2433 | if (ops->family >= NPROTO) { | |
2434 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); | |
2435 | return -ENOBUFS; | |
2436 | } | |
2437 | ||
2438 | spin_lock(&net_family_lock); | |
2439 | if (rcu_dereference_protected(net_families[ops->family], | |
2440 | lockdep_is_held(&net_family_lock))) | |
2441 | err = -EEXIST; | |
2442 | else { | |
2443 | rcu_assign_pointer(net_families[ops->family], ops); | |
2444 | err = 0; | |
2445 | } | |
2446 | spin_unlock(&net_family_lock); | |
2447 | ||
2448 | pr_info("NET: Registered protocol family %d\n", ops->family); | |
2449 | return err; | |
2450 | } | |
2451 | EXPORT_SYMBOL(sock_register); | |
2452 | ||
2453 | /** | |
2454 | * sock_unregister - remove a protocol handler | |
2455 | * @family: protocol family to remove | |
2456 | * | |
2457 | * This function is called by a protocol handler that wants to | |
2458 | * remove its address family, and have it unlinked from the | |
2459 | * new socket creation. | |
2460 | * | |
2461 | * If protocol handler is a module, then it can use module reference | |
2462 | * counts to protect against new references. If protocol handler is not | |
2463 | * a module then it needs to provide its own protection in | |
2464 | * the ops->create routine. | |
2465 | */ | |
2466 | void sock_unregister(int family) | |
2467 | { | |
2468 | BUG_ON(family < 0 || family >= NPROTO); | |
2469 | ||
2470 | spin_lock(&net_family_lock); | |
2471 | RCU_INIT_POINTER(net_families[family], NULL); | |
2472 | spin_unlock(&net_family_lock); | |
2473 | ||
2474 | synchronize_rcu(); | |
2475 | ||
2476 | pr_info("NET: Unregistered protocol family %d\n", family); | |
2477 | } | |
2478 | EXPORT_SYMBOL(sock_unregister); | |
2479 | ||
2480 | static int __init sock_init(void) | |
2481 | { | |
2482 | int err; | |
2483 | /* | |
2484 | * Initialize the network sysctl infrastructure. | |
2485 | */ | |
2486 | err = net_sysctl_init(); | |
2487 | if (err) | |
2488 | goto out; | |
2489 | ||
2490 | /* | |
2491 | * Initialize skbuff SLAB cache | |
2492 | */ | |
2493 | skb_init(); | |
2494 | ||
2495 | /* | |
2496 | * Initialize the protocols module. | |
2497 | */ | |
2498 | ||
2499 | init_inodecache(); | |
2500 | ||
2501 | err = register_filesystem(&sock_fs_type); | |
2502 | if (err) | |
2503 | goto out_fs; | |
2504 | sock_mnt = kern_mount(&sock_fs_type); | |
2505 | if (IS_ERR(sock_mnt)) { | |
2506 | err = PTR_ERR(sock_mnt); | |
2507 | goto out_mount; | |
2508 | } | |
2509 | ||
2510 | /* The real protocol initialization is performed in later initcalls. | |
2511 | */ | |
2512 | ||
2513 | #ifdef CONFIG_NETFILTER | |
2514 | err = netfilter_init(); | |
2515 | if (err) | |
2516 | goto out; | |
2517 | #endif | |
2518 | ||
2519 | ptp_classifier_init(); | |
2520 | ||
2521 | out: | |
2522 | return err; | |
2523 | ||
2524 | out_mount: | |
2525 | unregister_filesystem(&sock_fs_type); | |
2526 | out_fs: | |
2527 | goto out; | |
2528 | } | |
2529 | ||
2530 | core_initcall(sock_init); /* early initcall */ | |
2531 | ||
2532 | #ifdef CONFIG_PROC_FS | |
2533 | void socket_seq_show(struct seq_file *seq) | |
2534 | { | |
2535 | int cpu; | |
2536 | int counter = 0; | |
2537 | ||
2538 | for_each_possible_cpu(cpu) | |
2539 | counter += per_cpu(sockets_in_use, cpu); | |
2540 | ||
2541 | /* It can be negative, by the way. 8) */ | |
2542 | if (counter < 0) | |
2543 | counter = 0; | |
2544 | ||
2545 | seq_printf(seq, "sockets: used %d\n", counter); | |
2546 | } | |
2547 | #endif /* CONFIG_PROC_FS */ | |
2548 | ||
2549 | #ifdef CONFIG_COMPAT | |
2550 | static int do_siocgstamp(struct net *net, struct socket *sock, | |
2551 | unsigned int cmd, void __user *up) | |
2552 | { | |
2553 | mm_segment_t old_fs = get_fs(); | |
2554 | struct timeval ktv; | |
2555 | int err; | |
2556 | ||
2557 | set_fs(KERNEL_DS); | |
2558 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); | |
2559 | set_fs(old_fs); | |
2560 | if (!err) | |
2561 | err = compat_put_timeval(&ktv, up); | |
2562 | ||
2563 | return err; | |
2564 | } | |
2565 | ||
2566 | static int do_siocgstampns(struct net *net, struct socket *sock, | |
2567 | unsigned int cmd, void __user *up) | |
2568 | { | |
2569 | mm_segment_t old_fs = get_fs(); | |
2570 | struct timespec kts; | |
2571 | int err; | |
2572 | ||
2573 | set_fs(KERNEL_DS); | |
2574 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); | |
2575 | set_fs(old_fs); | |
2576 | if (!err) | |
2577 | err = compat_put_timespec(&kts, up); | |
2578 | ||
2579 | return err; | |
2580 | } | |
2581 | ||
2582 | static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) | |
2583 | { | |
2584 | struct ifreq __user *uifr; | |
2585 | int err; | |
2586 | ||
2587 | uifr = compat_alloc_user_space(sizeof(struct ifreq)); | |
2588 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) | |
2589 | return -EFAULT; | |
2590 | ||
2591 | err = dev_ioctl(net, SIOCGIFNAME, uifr); | |
2592 | if (err) | |
2593 | return err; | |
2594 | ||
2595 | if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) | |
2596 | return -EFAULT; | |
2597 | ||
2598 | return 0; | |
2599 | } | |
2600 | ||
2601 | static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) | |
2602 | { | |
2603 | struct compat_ifconf ifc32; | |
2604 | struct ifconf ifc; | |
2605 | struct ifconf __user *uifc; | |
2606 | struct compat_ifreq __user *ifr32; | |
2607 | struct ifreq __user *ifr; | |
2608 | unsigned int i, j; | |
2609 | int err; | |
2610 | ||
2611 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) | |
2612 | return -EFAULT; | |
2613 | ||
2614 | memset(&ifc, 0, sizeof(ifc)); | |
2615 | if (ifc32.ifcbuf == 0) { | |
2616 | ifc32.ifc_len = 0; | |
2617 | ifc.ifc_len = 0; | |
2618 | ifc.ifc_req = NULL; | |
2619 | uifc = compat_alloc_user_space(sizeof(struct ifconf)); | |
2620 | } else { | |
2621 | size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * | |
2622 | sizeof(struct ifreq); | |
2623 | uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); | |
2624 | ifc.ifc_len = len; | |
2625 | ifr = ifc.ifc_req = (void __user *)(uifc + 1); | |
2626 | ifr32 = compat_ptr(ifc32.ifcbuf); | |
2627 | for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { | |
2628 | if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) | |
2629 | return -EFAULT; | |
2630 | ifr++; | |
2631 | ifr32++; | |
2632 | } | |
2633 | } | |
2634 | if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) | |
2635 | return -EFAULT; | |
2636 | ||
2637 | err = dev_ioctl(net, SIOCGIFCONF, uifc); | |
2638 | if (err) | |
2639 | return err; | |
2640 | ||
2641 | if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) | |
2642 | return -EFAULT; | |
2643 | ||
2644 | ifr = ifc.ifc_req; | |
2645 | ifr32 = compat_ptr(ifc32.ifcbuf); | |
2646 | for (i = 0, j = 0; | |
2647 | i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; | |
2648 | i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { | |
2649 | if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) | |
2650 | return -EFAULT; | |
2651 | ifr32++; | |
2652 | ifr++; | |
2653 | } | |
2654 | ||
2655 | if (ifc32.ifcbuf == 0) { | |
2656 | /* Translate from 64-bit structure multiple to | |
2657 | * a 32-bit one. | |
2658 | */ | |
2659 | i = ifc.ifc_len; | |
2660 | i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); | |
2661 | ifc32.ifc_len = i; | |
2662 | } else { | |
2663 | ifc32.ifc_len = i; | |
2664 | } | |
2665 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) | |
2666 | return -EFAULT; | |
2667 | ||
2668 | return 0; | |
2669 | } | |
2670 | ||
2671 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) | |
2672 | { | |
2673 | struct compat_ethtool_rxnfc __user *compat_rxnfc; | |
2674 | bool convert_in = false, convert_out = false; | |
2675 | size_t buf_size = ALIGN(sizeof(struct ifreq), 8); | |
2676 | struct ethtool_rxnfc __user *rxnfc; | |
2677 | struct ifreq __user *ifr; | |
2678 | u32 rule_cnt = 0, actual_rule_cnt; | |
2679 | u32 ethcmd; | |
2680 | u32 data; | |
2681 | int ret; | |
2682 | ||
2683 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) | |
2684 | return -EFAULT; | |
2685 | ||
2686 | compat_rxnfc = compat_ptr(data); | |
2687 | ||
2688 | if (get_user(ethcmd, &compat_rxnfc->cmd)) | |
2689 | return -EFAULT; | |
2690 | ||
2691 | /* Most ethtool structures are defined without padding. | |
2692 | * Unfortunately struct ethtool_rxnfc is an exception. | |
2693 | */ | |
2694 | switch (ethcmd) { | |
2695 | default: | |
2696 | break; | |
2697 | case ETHTOOL_GRXCLSRLALL: | |
2698 | /* Buffer size is variable */ | |
2699 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) | |
2700 | return -EFAULT; | |
2701 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) | |
2702 | return -ENOMEM; | |
2703 | buf_size += rule_cnt * sizeof(u32); | |
2704 | /* fall through */ | |
2705 | case ETHTOOL_GRXRINGS: | |
2706 | case ETHTOOL_GRXCLSRLCNT: | |
2707 | case ETHTOOL_GRXCLSRULE: | |
2708 | case ETHTOOL_SRXCLSRLINS: | |
2709 | convert_out = true; | |
2710 | /* fall through */ | |
2711 | case ETHTOOL_SRXCLSRLDEL: | |
2712 | buf_size += sizeof(struct ethtool_rxnfc); | |
2713 | convert_in = true; | |
2714 | break; | |
2715 | } | |
2716 | ||
2717 | ifr = compat_alloc_user_space(buf_size); | |
2718 | rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); | |
2719 | ||
2720 | if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) | |
2721 | return -EFAULT; | |
2722 | ||
2723 | if (put_user(convert_in ? rxnfc : compat_ptr(data), | |
2724 | &ifr->ifr_ifru.ifru_data)) | |
2725 | return -EFAULT; | |
2726 | ||
2727 | if (convert_in) { | |
2728 | /* We expect there to be holes between fs.m_ext and | |
2729 | * fs.ring_cookie and at the end of fs, but nowhere else. | |
2730 | */ | |
2731 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + | |
2732 | sizeof(compat_rxnfc->fs.m_ext) != | |
2733 | offsetof(struct ethtool_rxnfc, fs.m_ext) + | |
2734 | sizeof(rxnfc->fs.m_ext)); | |
2735 | BUILD_BUG_ON( | |
2736 | offsetof(struct compat_ethtool_rxnfc, fs.location) - | |
2737 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != | |
2738 | offsetof(struct ethtool_rxnfc, fs.location) - | |
2739 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); | |
2740 | ||
2741 | if (copy_in_user(rxnfc, compat_rxnfc, | |
2742 | (void __user *)(&rxnfc->fs.m_ext + 1) - | |
2743 | (void __user *)rxnfc) || | |
2744 | copy_in_user(&rxnfc->fs.ring_cookie, | |
2745 | &compat_rxnfc->fs.ring_cookie, | |
2746 | (void __user *)(&rxnfc->fs.location + 1) - | |
2747 | (void __user *)&rxnfc->fs.ring_cookie) || | |
2748 | copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, | |
2749 | sizeof(rxnfc->rule_cnt))) | |
2750 | return -EFAULT; | |
2751 | } | |
2752 | ||
2753 | ret = dev_ioctl(net, SIOCETHTOOL, ifr); | |
2754 | if (ret) | |
2755 | return ret; | |
2756 | ||
2757 | if (convert_out) { | |
2758 | if (copy_in_user(compat_rxnfc, rxnfc, | |
2759 | (const void __user *)(&rxnfc->fs.m_ext + 1) - | |
2760 | (const void __user *)rxnfc) || | |
2761 | copy_in_user(&compat_rxnfc->fs.ring_cookie, | |
2762 | &rxnfc->fs.ring_cookie, | |
2763 | (const void __user *)(&rxnfc->fs.location + 1) - | |
2764 | (const void __user *)&rxnfc->fs.ring_cookie) || | |
2765 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, | |
2766 | sizeof(rxnfc->rule_cnt))) | |
2767 | return -EFAULT; | |
2768 | ||
2769 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
2770 | /* As an optimisation, we only copy the actual | |
2771 | * number of rules that the underlying | |
2772 | * function returned. Since Mallory might | |
2773 | * change the rule count in user memory, we | |
2774 | * check that it is less than the rule count | |
2775 | * originally given (as the user buffer size), | |
2776 | * which has been range-checked. | |
2777 | */ | |
2778 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) | |
2779 | return -EFAULT; | |
2780 | if (actual_rule_cnt < rule_cnt) | |
2781 | rule_cnt = actual_rule_cnt; | |
2782 | if (copy_in_user(&compat_rxnfc->rule_locs[0], | |
2783 | &rxnfc->rule_locs[0], | |
2784 | rule_cnt * sizeof(u32))) | |
2785 | return -EFAULT; | |
2786 | } | |
2787 | } | |
2788 | ||
2789 | return 0; | |
2790 | } | |
2791 | ||
2792 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) | |
2793 | { | |
2794 | void __user *uptr; | |
2795 | compat_uptr_t uptr32; | |
2796 | struct ifreq __user *uifr; | |
2797 | ||
2798 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
2799 | if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) | |
2800 | return -EFAULT; | |
2801 | ||
2802 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
2803 | return -EFAULT; | |
2804 | ||
2805 | uptr = compat_ptr(uptr32); | |
2806 | ||
2807 | if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) | |
2808 | return -EFAULT; | |
2809 | ||
2810 | return dev_ioctl(net, SIOCWANDEV, uifr); | |
2811 | } | |
2812 | ||
2813 | static int bond_ioctl(struct net *net, unsigned int cmd, | |
2814 | struct compat_ifreq __user *ifr32) | |
2815 | { | |
2816 | struct ifreq kifr; | |
2817 | mm_segment_t old_fs; | |
2818 | int err; | |
2819 | ||
2820 | switch (cmd) { | |
2821 | case SIOCBONDENSLAVE: | |
2822 | case SIOCBONDRELEASE: | |
2823 | case SIOCBONDSETHWADDR: | |
2824 | case SIOCBONDCHANGEACTIVE: | |
2825 | if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) | |
2826 | return -EFAULT; | |
2827 | ||
2828 | old_fs = get_fs(); | |
2829 | set_fs(KERNEL_DS); | |
2830 | err = dev_ioctl(net, cmd, | |
2831 | (struct ifreq __user __force *) &kifr); | |
2832 | set_fs(old_fs); | |
2833 | ||
2834 | return err; | |
2835 | default: | |
2836 | return -ENOIOCTLCMD; | |
2837 | } | |
2838 | } | |
2839 | ||
2840 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ | |
2841 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
2842 | struct compat_ifreq __user *u_ifreq32) | |
2843 | { | |
2844 | struct ifreq __user *u_ifreq64; | |
2845 | char tmp_buf[IFNAMSIZ]; | |
2846 | void __user *data64; | |
2847 | u32 data32; | |
2848 | ||
2849 | if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), | |
2850 | IFNAMSIZ)) | |
2851 | return -EFAULT; | |
2852 | if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) | |
2853 | return -EFAULT; | |
2854 | data64 = compat_ptr(data32); | |
2855 | ||
2856 | u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); | |
2857 | ||
2858 | if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], | |
2859 | IFNAMSIZ)) | |
2860 | return -EFAULT; | |
2861 | if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) | |
2862 | return -EFAULT; | |
2863 | ||
2864 | return dev_ioctl(net, cmd, u_ifreq64); | |
2865 | } | |
2866 | ||
2867 | static int dev_ifsioc(struct net *net, struct socket *sock, | |
2868 | unsigned int cmd, struct compat_ifreq __user *uifr32) | |
2869 | { | |
2870 | struct ifreq __user *uifr; | |
2871 | int err; | |
2872 | ||
2873 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
2874 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) | |
2875 | return -EFAULT; | |
2876 | ||
2877 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); | |
2878 | ||
2879 | if (!err) { | |
2880 | switch (cmd) { | |
2881 | case SIOCGIFFLAGS: | |
2882 | case SIOCGIFMETRIC: | |
2883 | case SIOCGIFMTU: | |
2884 | case SIOCGIFMEM: | |
2885 | case SIOCGIFHWADDR: | |
2886 | case SIOCGIFINDEX: | |
2887 | case SIOCGIFADDR: | |
2888 | case SIOCGIFBRDADDR: | |
2889 | case SIOCGIFDSTADDR: | |
2890 | case SIOCGIFNETMASK: | |
2891 | case SIOCGIFPFLAGS: | |
2892 | case SIOCGIFTXQLEN: | |
2893 | case SIOCGMIIPHY: | |
2894 | case SIOCGMIIREG: | |
2895 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) | |
2896 | err = -EFAULT; | |
2897 | break; | |
2898 | } | |
2899 | } | |
2900 | return err; | |
2901 | } | |
2902 | ||
2903 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, | |
2904 | struct compat_ifreq __user *uifr32) | |
2905 | { | |
2906 | struct ifreq ifr; | |
2907 | struct compat_ifmap __user *uifmap32; | |
2908 | mm_segment_t old_fs; | |
2909 | int err; | |
2910 | ||
2911 | uifmap32 = &uifr32->ifr_ifru.ifru_map; | |
2912 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); | |
2913 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); | |
2914 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
2915 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
2916 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); | |
2917 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); | |
2918 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); | |
2919 | if (err) | |
2920 | return -EFAULT; | |
2921 | ||
2922 | old_fs = get_fs(); | |
2923 | set_fs(KERNEL_DS); | |
2924 | err = dev_ioctl(net, cmd, (void __user __force *)&ifr); | |
2925 | set_fs(old_fs); | |
2926 | ||
2927 | if (cmd == SIOCGIFMAP && !err) { | |
2928 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); | |
2929 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); | |
2930 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
2931 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
2932 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); | |
2933 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); | |
2934 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); | |
2935 | if (err) | |
2936 | err = -EFAULT; | |
2937 | } | |
2938 | return err; | |
2939 | } | |
2940 | ||
2941 | struct rtentry32 { | |
2942 | u32 rt_pad1; | |
2943 | struct sockaddr rt_dst; /* target address */ | |
2944 | struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ | |
2945 | struct sockaddr rt_genmask; /* target network mask (IP) */ | |
2946 | unsigned short rt_flags; | |
2947 | short rt_pad2; | |
2948 | u32 rt_pad3; | |
2949 | unsigned char rt_tos; | |
2950 | unsigned char rt_class; | |
2951 | short rt_pad4; | |
2952 | short rt_metric; /* +1 for binary compatibility! */ | |
2953 | /* char * */ u32 rt_dev; /* forcing the device at add */ | |
2954 | u32 rt_mtu; /* per route MTU/Window */ | |
2955 | u32 rt_window; /* Window clamping */ | |
2956 | unsigned short rt_irtt; /* Initial RTT */ | |
2957 | }; | |
2958 | ||
2959 | struct in6_rtmsg32 { | |
2960 | struct in6_addr rtmsg_dst; | |
2961 | struct in6_addr rtmsg_src; | |
2962 | struct in6_addr rtmsg_gateway; | |
2963 | u32 rtmsg_type; | |
2964 | u16 rtmsg_dst_len; | |
2965 | u16 rtmsg_src_len; | |
2966 | u32 rtmsg_metric; | |
2967 | u32 rtmsg_info; | |
2968 | u32 rtmsg_flags; | |
2969 | s32 rtmsg_ifindex; | |
2970 | }; | |
2971 | ||
2972 | static int routing_ioctl(struct net *net, struct socket *sock, | |
2973 | unsigned int cmd, void __user *argp) | |
2974 | { | |
2975 | int ret; | |
2976 | void *r = NULL; | |
2977 | struct in6_rtmsg r6; | |
2978 | struct rtentry r4; | |
2979 | char devname[16]; | |
2980 | u32 rtdev; | |
2981 | mm_segment_t old_fs = get_fs(); | |
2982 | ||
2983 | if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ | |
2984 | struct in6_rtmsg32 __user *ur6 = argp; | |
2985 | ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), | |
2986 | 3 * sizeof(struct in6_addr)); | |
2987 | ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); | |
2988 | ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); | |
2989 | ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); | |
2990 | ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); | |
2991 | ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); | |
2992 | ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); | |
2993 | ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); | |
2994 | ||
2995 | r = (void *) &r6; | |
2996 | } else { /* ipv4 */ | |
2997 | struct rtentry32 __user *ur4 = argp; | |
2998 | ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), | |
2999 | 3 * sizeof(struct sockaddr)); | |
3000 | ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); | |
3001 | ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); | |
3002 | ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); | |
3003 | ret |= get_user(r4.rt_window, &(ur4->rt_window)); | |
3004 | ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); | |
3005 | ret |= get_user(rtdev, &(ur4->rt_dev)); | |
3006 | if (rtdev) { | |
3007 | ret |= copy_from_user(devname, compat_ptr(rtdev), 15); | |
3008 | r4.rt_dev = (char __user __force *)devname; | |
3009 | devname[15] = 0; | |
3010 | } else | |
3011 | r4.rt_dev = NULL; | |
3012 | ||
3013 | r = (void *) &r4; | |
3014 | } | |
3015 | ||
3016 | if (ret) { | |
3017 | ret = -EFAULT; | |
3018 | goto out; | |
3019 | } | |
3020 | ||
3021 | set_fs(KERNEL_DS); | |
3022 | ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); | |
3023 | set_fs(old_fs); | |
3024 | ||
3025 | out: | |
3026 | return ret; | |
3027 | } | |
3028 | ||
3029 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE | |
3030 | * for some operations; this forces use of the newer bridge-utils that | |
3031 | * use compatible ioctls | |
3032 | */ | |
3033 | static int old_bridge_ioctl(compat_ulong_t __user *argp) | |
3034 | { | |
3035 | compat_ulong_t tmp; | |
3036 | ||
3037 | if (get_user(tmp, argp)) | |
3038 | return -EFAULT; | |
3039 | if (tmp == BRCTL_GET_VERSION) | |
3040 | return BRCTL_VERSION + 1; | |
3041 | return -EINVAL; | |
3042 | } | |
3043 | ||
3044 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, | |
3045 | unsigned int cmd, unsigned long arg) | |
3046 | { | |
3047 | void __user *argp = compat_ptr(arg); | |
3048 | struct sock *sk = sock->sk; | |
3049 | struct net *net = sock_net(sk); | |
3050 | ||
3051 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) | |
3052 | return compat_ifr_data_ioctl(net, cmd, argp); | |
3053 | ||
3054 | switch (cmd) { | |
3055 | case SIOCSIFBR: | |
3056 | case SIOCGIFBR: | |
3057 | return old_bridge_ioctl(argp); | |
3058 | case SIOCGIFNAME: | |
3059 | return dev_ifname32(net, argp); | |
3060 | case SIOCGIFCONF: | |
3061 | return dev_ifconf(net, argp); | |
3062 | case SIOCETHTOOL: | |
3063 | return ethtool_ioctl(net, argp); | |
3064 | case SIOCWANDEV: | |
3065 | return compat_siocwandev(net, argp); | |
3066 | case SIOCGIFMAP: | |
3067 | case SIOCSIFMAP: | |
3068 | return compat_sioc_ifmap(net, cmd, argp); | |
3069 | case SIOCBONDENSLAVE: | |
3070 | case SIOCBONDRELEASE: | |
3071 | case SIOCBONDSETHWADDR: | |
3072 | case SIOCBONDCHANGEACTIVE: | |
3073 | return bond_ioctl(net, cmd, argp); | |
3074 | case SIOCADDRT: | |
3075 | case SIOCDELRT: | |
3076 | return routing_ioctl(net, sock, cmd, argp); | |
3077 | case SIOCGSTAMP: | |
3078 | return do_siocgstamp(net, sock, cmd, argp); | |
3079 | case SIOCGSTAMPNS: | |
3080 | return do_siocgstampns(net, sock, cmd, argp); | |
3081 | case SIOCBONDSLAVEINFOQUERY: | |
3082 | case SIOCBONDINFOQUERY: | |
3083 | case SIOCSHWTSTAMP: | |
3084 | case SIOCGHWTSTAMP: | |
3085 | return compat_ifr_data_ioctl(net, cmd, argp); | |
3086 | ||
3087 | case FIOSETOWN: | |
3088 | case SIOCSPGRP: | |
3089 | case FIOGETOWN: | |
3090 | case SIOCGPGRP: | |
3091 | case SIOCBRADDBR: | |
3092 | case SIOCBRDELBR: | |
3093 | case SIOCGIFVLAN: | |
3094 | case SIOCSIFVLAN: | |
3095 | case SIOCADDDLCI: | |
3096 | case SIOCDELDLCI: | |
3097 | return sock_ioctl(file, cmd, arg); | |
3098 | ||
3099 | case SIOCGIFFLAGS: | |
3100 | case SIOCSIFFLAGS: | |
3101 | case SIOCGIFMETRIC: | |
3102 | case SIOCSIFMETRIC: | |
3103 | case SIOCGIFMTU: | |
3104 | case SIOCSIFMTU: | |
3105 | case SIOCGIFMEM: | |
3106 | case SIOCSIFMEM: | |
3107 | case SIOCGIFHWADDR: | |
3108 | case SIOCSIFHWADDR: | |
3109 | case SIOCADDMULTI: | |
3110 | case SIOCDELMULTI: | |
3111 | case SIOCGIFINDEX: | |
3112 | case SIOCGIFADDR: | |
3113 | case SIOCSIFADDR: | |
3114 | case SIOCSIFHWBROADCAST: | |
3115 | case SIOCDIFADDR: | |
3116 | case SIOCGIFBRDADDR: | |
3117 | case SIOCSIFBRDADDR: | |
3118 | case SIOCGIFDSTADDR: | |
3119 | case SIOCSIFDSTADDR: | |
3120 | case SIOCGIFNETMASK: | |
3121 | case SIOCSIFNETMASK: | |
3122 | case SIOCSIFPFLAGS: | |
3123 | case SIOCGIFPFLAGS: | |
3124 | case SIOCGIFTXQLEN: | |
3125 | case SIOCSIFTXQLEN: | |
3126 | case SIOCBRADDIF: | |
3127 | case SIOCBRDELIF: | |
3128 | case SIOCSIFNAME: | |
3129 | case SIOCGMIIPHY: | |
3130 | case SIOCGMIIREG: | |
3131 | case SIOCSMIIREG: | |
3132 | return dev_ifsioc(net, sock, cmd, argp); | |
3133 | ||
3134 | case SIOCSARP: | |
3135 | case SIOCGARP: | |
3136 | case SIOCDARP: | |
3137 | case SIOCATMARK: | |
3138 | return sock_do_ioctl(net, sock, cmd, arg); | |
3139 | } | |
3140 | ||
3141 | return -ENOIOCTLCMD; | |
3142 | } | |
3143 | ||
3144 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, | |
3145 | unsigned long arg) | |
3146 | { | |
3147 | struct socket *sock = file->private_data; | |
3148 | int ret = -ENOIOCTLCMD; | |
3149 | struct sock *sk; | |
3150 | struct net *net; | |
3151 | ||
3152 | sk = sock->sk; | |
3153 | net = sock_net(sk); | |
3154 | ||
3155 | if (sock->ops->compat_ioctl) | |
3156 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3157 | ||
3158 | if (ret == -ENOIOCTLCMD && | |
3159 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3160 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3161 | ||
3162 | if (ret == -ENOIOCTLCMD) | |
3163 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3164 | ||
3165 | return ret; | |
3166 | } | |
3167 | #endif | |
3168 | ||
3169 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) | |
3170 | { | |
3171 | return sock->ops->bind(sock, addr, addrlen); | |
3172 | } | |
3173 | EXPORT_SYMBOL(kernel_bind); | |
3174 | ||
3175 | int kernel_listen(struct socket *sock, int backlog) | |
3176 | { | |
3177 | return sock->ops->listen(sock, backlog); | |
3178 | } | |
3179 | EXPORT_SYMBOL(kernel_listen); | |
3180 | ||
3181 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
3182 | { | |
3183 | struct sock *sk = sock->sk; | |
3184 | int err; | |
3185 | ||
3186 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3187 | newsock); | |
3188 | if (err < 0) | |
3189 | goto done; | |
3190 | ||
3191 | err = sock->ops->accept(sock, *newsock, flags); | |
3192 | if (err < 0) { | |
3193 | sock_release(*newsock); | |
3194 | *newsock = NULL; | |
3195 | goto done; | |
3196 | } | |
3197 | ||
3198 | (*newsock)->ops = sock->ops; | |
3199 | __module_get((*newsock)->ops->owner); | |
3200 | ||
3201 | done: | |
3202 | return err; | |
3203 | } | |
3204 | EXPORT_SYMBOL(kernel_accept); | |
3205 | ||
3206 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
3207 | int flags) | |
3208 | { | |
3209 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3210 | } | |
3211 | EXPORT_SYMBOL(kernel_connect); | |
3212 | ||
3213 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
3214 | int *addrlen) | |
3215 | { | |
3216 | return sock->ops->getname(sock, addr, addrlen, 0); | |
3217 | } | |
3218 | EXPORT_SYMBOL(kernel_getsockname); | |
3219 | ||
3220 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
3221 | int *addrlen) | |
3222 | { | |
3223 | return sock->ops->getname(sock, addr, addrlen, 1); | |
3224 | } | |
3225 | EXPORT_SYMBOL(kernel_getpeername); | |
3226 | ||
3227 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
3228 | char *optval, int *optlen) | |
3229 | { | |
3230 | mm_segment_t oldfs = get_fs(); | |
3231 | char __user *uoptval; | |
3232 | int __user *uoptlen; | |
3233 | int err; | |
3234 | ||
3235 | uoptval = (char __user __force *) optval; | |
3236 | uoptlen = (int __user __force *) optlen; | |
3237 | ||
3238 | set_fs(KERNEL_DS); | |
3239 | if (level == SOL_SOCKET) | |
3240 | err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); | |
3241 | else | |
3242 | err = sock->ops->getsockopt(sock, level, optname, uoptval, | |
3243 | uoptlen); | |
3244 | set_fs(oldfs); | |
3245 | return err; | |
3246 | } | |
3247 | EXPORT_SYMBOL(kernel_getsockopt); | |
3248 | ||
3249 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
3250 | char *optval, unsigned int optlen) | |
3251 | { | |
3252 | mm_segment_t oldfs = get_fs(); | |
3253 | char __user *uoptval; | |
3254 | int err; | |
3255 | ||
3256 | uoptval = (char __user __force *) optval; | |
3257 | ||
3258 | set_fs(KERNEL_DS); | |
3259 | if (level == SOL_SOCKET) | |
3260 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); | |
3261 | else | |
3262 | err = sock->ops->setsockopt(sock, level, optname, uoptval, | |
3263 | optlen); | |
3264 | set_fs(oldfs); | |
3265 | return err; | |
3266 | } | |
3267 | EXPORT_SYMBOL(kernel_setsockopt); | |
3268 | ||
3269 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
3270 | size_t size, int flags) | |
3271 | { | |
3272 | if (sock->ops->sendpage) | |
3273 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
3274 | ||
3275 | return sock_no_sendpage(sock, page, offset, size, flags); | |
3276 | } | |
3277 | EXPORT_SYMBOL(kernel_sendpage); | |
3278 | ||
3279 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) | |
3280 | { | |
3281 | mm_segment_t oldfs = get_fs(); | |
3282 | int err; | |
3283 | ||
3284 | set_fs(KERNEL_DS); | |
3285 | err = sock->ops->ioctl(sock, cmd, arg); | |
3286 | set_fs(oldfs); | |
3287 | ||
3288 | return err; | |
3289 | } | |
3290 | EXPORT_SYMBOL(kernel_sock_ioctl); | |
3291 | ||
3292 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) | |
3293 | { | |
3294 | return sock->ops->shutdown(sock, how); | |
3295 | } | |
3296 | EXPORT_SYMBOL(kernel_sock_shutdown); |