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1 | /* | |
2 | * NET An implementation of the SOCKET network access protocol. | |
3 | * | |
4 | * Version: @(#)socket.c 1.1.93 18/02/95 | |
5 | * | |
6 | * Authors: Orest Zborowski, <obz@Kodak.COM> | |
7 | * Ross Biro | |
8 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> | |
9 | * | |
10 | * Fixes: | |
11 | * Anonymous : NOTSOCK/BADF cleanup. Error fix in | |
12 | * shutdown() | |
13 | * Alan Cox : verify_area() fixes | |
14 | * Alan Cox : Removed DDI | |
15 | * Jonathan Kamens : SOCK_DGRAM reconnect bug | |
16 | * Alan Cox : Moved a load of checks to the very | |
17 | * top level. | |
18 | * Alan Cox : Move address structures to/from user | |
19 | * mode above the protocol layers. | |
20 | * Rob Janssen : Allow 0 length sends. | |
21 | * Alan Cox : Asynchronous I/O support (cribbed from the | |
22 | * tty drivers). | |
23 | * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) | |
24 | * Jeff Uphoff : Made max number of sockets command-line | |
25 | * configurable. | |
26 | * Matti Aarnio : Made the number of sockets dynamic, | |
27 | * to be allocated when needed, and mr. | |
28 | * Uphoff's max is used as max to be | |
29 | * allowed to allocate. | |
30 | * Linus : Argh. removed all the socket allocation | |
31 | * altogether: it's in the inode now. | |
32 | * Alan Cox : Made sock_alloc()/sock_release() public | |
33 | * for NetROM and future kernel nfsd type | |
34 | * stuff. | |
35 | * Alan Cox : sendmsg/recvmsg basics. | |
36 | * Tom Dyas : Export net symbols. | |
37 | * Marcin Dalecki : Fixed problems with CONFIG_NET="n". | |
38 | * Alan Cox : Added thread locking to sys_* calls | |
39 | * for sockets. May have errors at the | |
40 | * moment. | |
41 | * Kevin Buhr : Fixed the dumb errors in the above. | |
42 | * Andi Kleen : Some small cleanups, optimizations, | |
43 | * and fixed a copy_from_user() bug. | |
44 | * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) | |
45 | * Tigran Aivazian : Made listen(2) backlog sanity checks | |
46 | * protocol-independent | |
47 | * | |
48 | * | |
49 | * This program is free software; you can redistribute it and/or | |
50 | * modify it under the terms of the GNU General Public License | |
51 | * as published by the Free Software Foundation; either version | |
52 | * 2 of the License, or (at your option) any later version. | |
53 | * | |
54 | * | |
55 | * This module is effectively the top level interface to the BSD socket | |
56 | * paradigm. | |
57 | * | |
58 | * Based upon Swansea University Computer Society NET3.039 | |
59 | */ | |
60 | ||
61 | #include <linux/mm.h> | |
62 | #include <linux/socket.h> | |
63 | #include <linux/file.h> | |
64 | #include <linux/net.h> | |
65 | #include <linux/interrupt.h> | |
66 | #include <linux/thread_info.h> | |
67 | #include <linux/rcupdate.h> | |
68 | #include <linux/netdevice.h> | |
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
71 | #include <linux/mutex.h> | |
72 | #include <linux/if_bridge.h> | |
73 | #include <linux/if_frad.h> | |
74 | #include <linux/if_vlan.h> | |
75 | #include <linux/ptp_classify.h> | |
76 | #include <linux/init.h> | |
77 | #include <linux/poll.h> | |
78 | #include <linux/cache.h> | |
79 | #include <linux/module.h> | |
80 | #include <linux/highmem.h> | |
81 | #include <linux/mount.h> | |
82 | #include <linux/security.h> | |
83 | #include <linux/syscalls.h> | |
84 | #include <linux/compat.h> | |
85 | #include <linux/kmod.h> | |
86 | #include <linux/audit.h> | |
87 | #include <linux/wireless.h> | |
88 | #include <linux/nsproxy.h> | |
89 | #include <linux/magic.h> | |
90 | #include <linux/slab.h> | |
91 | #include <linux/xattr.h> | |
92 | ||
93 | #include <linux/uaccess.h> | |
94 | #include <asm/unistd.h> | |
95 | ||
96 | #include <net/compat.h> | |
97 | #include <net/wext.h> | |
98 | #include <net/cls_cgroup.h> | |
99 | ||
100 | #include <net/sock.h> | |
101 | #include <linux/netfilter.h> | |
102 | ||
103 | #include <linux/if_tun.h> | |
104 | #include <linux/ipv6_route.h> | |
105 | #include <linux/route.h> | |
106 | #include <linux/sockios.h> | |
107 | #include <linux/atalk.h> | |
108 | #include <net/busy_poll.h> | |
109 | #include <linux/errqueue.h> | |
110 | ||
111 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
112 | unsigned int sysctl_net_busy_read __read_mostly; | |
113 | unsigned int sysctl_net_busy_poll __read_mostly; | |
114 | #endif | |
115 | ||
116 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); | |
117 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); | |
118 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); | |
119 | ||
120 | static int sock_close(struct inode *inode, struct file *file); | |
121 | static __poll_t 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 | * Support routines. | |
167 | * Move socket addresses back and forth across the kernel/user | |
168 | * divide and look after the messy bits. | |
169 | */ | |
170 | ||
171 | /** | |
172 | * move_addr_to_kernel - copy a socket address into kernel space | |
173 | * @uaddr: Address in user space | |
174 | * @kaddr: Address in kernel space | |
175 | * @ulen: Length in user space | |
176 | * | |
177 | * The address is copied into kernel space. If the provided address is | |
178 | * too long an error code of -EINVAL is returned. If the copy gives | |
179 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
180 | */ | |
181 | ||
182 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) | |
183 | { | |
184 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) | |
185 | return -EINVAL; | |
186 | if (ulen == 0) | |
187 | return 0; | |
188 | if (copy_from_user(kaddr, uaddr, ulen)) | |
189 | return -EFAULT; | |
190 | return audit_sockaddr(ulen, kaddr); | |
191 | } | |
192 | ||
193 | /** | |
194 | * move_addr_to_user - copy an address to user space | |
195 | * @kaddr: kernel space address | |
196 | * @klen: length of address in kernel | |
197 | * @uaddr: user space address | |
198 | * @ulen: pointer to user length field | |
199 | * | |
200 | * The value pointed to by ulen on entry is the buffer length available. | |
201 | * This is overwritten with the buffer space used. -EINVAL is returned | |
202 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
203 | * is returned if either the buffer or the length field are not | |
204 | * accessible. | |
205 | * After copying the data up to the limit the user specifies, the true | |
206 | * length of the data is written over the length limit the user | |
207 | * specified. Zero is returned for a success. | |
208 | */ | |
209 | ||
210 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, | |
211 | void __user *uaddr, int __user *ulen) | |
212 | { | |
213 | int err; | |
214 | int len; | |
215 | ||
216 | BUG_ON(klen > sizeof(struct sockaddr_storage)); | |
217 | err = get_user(len, ulen); | |
218 | if (err) | |
219 | return err; | |
220 | if (len > klen) | |
221 | len = klen; | |
222 | if (len < 0) | |
223 | return -EINVAL; | |
224 | if (len) { | |
225 | if (audit_sockaddr(klen, kaddr)) | |
226 | return -ENOMEM; | |
227 | if (copy_to_user(uaddr, kaddr, len)) | |
228 | return -EFAULT; | |
229 | } | |
230 | /* | |
231 | * "fromlen shall refer to the value before truncation.." | |
232 | * 1003.1g | |
233 | */ | |
234 | return __put_user(klen, ulen); | |
235 | } | |
236 | ||
237 | static struct kmem_cache *sock_inode_cachep __read_mostly; | |
238 | ||
239 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
240 | { | |
241 | struct socket_alloc *ei; | |
242 | struct socket_wq *wq; | |
243 | ||
244 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); | |
245 | if (!ei) | |
246 | return NULL; | |
247 | wq = kmalloc(sizeof(*wq), GFP_KERNEL); | |
248 | if (!wq) { | |
249 | kmem_cache_free(sock_inode_cachep, ei); | |
250 | return NULL; | |
251 | } | |
252 | init_waitqueue_head(&wq->wait); | |
253 | wq->fasync_list = NULL; | |
254 | wq->flags = 0; | |
255 | RCU_INIT_POINTER(ei->socket.wq, wq); | |
256 | ||
257 | ei->socket.state = SS_UNCONNECTED; | |
258 | ei->socket.flags = 0; | |
259 | ei->socket.ops = NULL; | |
260 | ei->socket.sk = NULL; | |
261 | ei->socket.file = NULL; | |
262 | ||
263 | return &ei->vfs_inode; | |
264 | } | |
265 | ||
266 | static void sock_destroy_inode(struct inode *inode) | |
267 | { | |
268 | struct socket_alloc *ei; | |
269 | struct socket_wq *wq; | |
270 | ||
271 | ei = container_of(inode, struct socket_alloc, vfs_inode); | |
272 | wq = rcu_dereference_protected(ei->socket.wq, 1); | |
273 | kfree_rcu(wq, rcu); | |
274 | kmem_cache_free(sock_inode_cachep, ei); | |
275 | } | |
276 | ||
277 | static void init_once(void *foo) | |
278 | { | |
279 | struct socket_alloc *ei = (struct socket_alloc *)foo; | |
280 | ||
281 | inode_init_once(&ei->vfs_inode); | |
282 | } | |
283 | ||
284 | static void init_inodecache(void) | |
285 | { | |
286 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
287 | sizeof(struct socket_alloc), | |
288 | 0, | |
289 | (SLAB_HWCACHE_ALIGN | | |
290 | SLAB_RECLAIM_ACCOUNT | | |
291 | SLAB_MEM_SPREAD | SLAB_ACCOUNT), | |
292 | init_once); | |
293 | BUG_ON(sock_inode_cachep == NULL); | |
294 | } | |
295 | ||
296 | static const struct super_operations sockfs_ops = { | |
297 | .alloc_inode = sock_alloc_inode, | |
298 | .destroy_inode = sock_destroy_inode, | |
299 | .statfs = simple_statfs, | |
300 | }; | |
301 | ||
302 | /* | |
303 | * sockfs_dname() is called from d_path(). | |
304 | */ | |
305 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
306 | { | |
307 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
308 | d_inode(dentry)->i_ino); | |
309 | } | |
310 | ||
311 | static const struct dentry_operations sockfs_dentry_operations = { | |
312 | .d_dname = sockfs_dname, | |
313 | }; | |
314 | ||
315 | static int sockfs_xattr_get(const struct xattr_handler *handler, | |
316 | struct dentry *dentry, struct inode *inode, | |
317 | const char *suffix, void *value, size_t size) | |
318 | { | |
319 | if (value) { | |
320 | if (dentry->d_name.len + 1 > size) | |
321 | return -ERANGE; | |
322 | memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); | |
323 | } | |
324 | return dentry->d_name.len + 1; | |
325 | } | |
326 | ||
327 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
328 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
329 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
330 | ||
331 | static const struct xattr_handler sockfs_xattr_handler = { | |
332 | .name = XATTR_NAME_SOCKPROTONAME, | |
333 | .get = sockfs_xattr_get, | |
334 | }; | |
335 | ||
336 | static int sockfs_security_xattr_set(const struct xattr_handler *handler, | |
337 | struct dentry *dentry, struct inode *inode, | |
338 | const char *suffix, const void *value, | |
339 | size_t size, int flags) | |
340 | { | |
341 | /* Handled by LSM. */ | |
342 | return -EAGAIN; | |
343 | } | |
344 | ||
345 | static const struct xattr_handler sockfs_security_xattr_handler = { | |
346 | .prefix = XATTR_SECURITY_PREFIX, | |
347 | .set = sockfs_security_xattr_set, | |
348 | }; | |
349 | ||
350 | static const struct xattr_handler *sockfs_xattr_handlers[] = { | |
351 | &sockfs_xattr_handler, | |
352 | &sockfs_security_xattr_handler, | |
353 | NULL | |
354 | }; | |
355 | ||
356 | static struct dentry *sockfs_mount(struct file_system_type *fs_type, | |
357 | int flags, const char *dev_name, void *data) | |
358 | { | |
359 | return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, | |
360 | sockfs_xattr_handlers, | |
361 | &sockfs_dentry_operations, SOCKFS_MAGIC); | |
362 | } | |
363 | ||
364 | static struct vfsmount *sock_mnt __read_mostly; | |
365 | ||
366 | static struct file_system_type sock_fs_type = { | |
367 | .name = "sockfs", | |
368 | .mount = sockfs_mount, | |
369 | .kill_sb = kill_anon_super, | |
370 | }; | |
371 | ||
372 | /* | |
373 | * Obtains the first available file descriptor and sets it up for use. | |
374 | * | |
375 | * These functions create file structures and maps them to fd space | |
376 | * of the current process. On success it returns file descriptor | |
377 | * and file struct implicitly stored in sock->file. | |
378 | * Note that another thread may close file descriptor before we return | |
379 | * from this function. We use the fact that now we do not refer | |
380 | * to socket after mapping. If one day we will need it, this | |
381 | * function will increment ref. count on file by 1. | |
382 | * | |
383 | * In any case returned fd MAY BE not valid! | |
384 | * This race condition is unavoidable | |
385 | * with shared fd spaces, we cannot solve it inside kernel, | |
386 | * but we take care of internal coherence yet. | |
387 | */ | |
388 | ||
389 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) | |
390 | { | |
391 | struct qstr name = { .name = "" }; | |
392 | struct path path; | |
393 | struct file *file; | |
394 | ||
395 | if (dname) { | |
396 | name.name = dname; | |
397 | name.len = strlen(name.name); | |
398 | } else if (sock->sk) { | |
399 | name.name = sock->sk->sk_prot_creator->name; | |
400 | name.len = strlen(name.name); | |
401 | } | |
402 | path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); | |
403 | if (unlikely(!path.dentry)) { | |
404 | sock_release(sock); | |
405 | return ERR_PTR(-ENOMEM); | |
406 | } | |
407 | path.mnt = mntget(sock_mnt); | |
408 | ||
409 | d_instantiate(path.dentry, SOCK_INODE(sock)); | |
410 | ||
411 | file = alloc_file(&path, FMODE_READ | FMODE_WRITE, | |
412 | &socket_file_ops); | |
413 | if (IS_ERR(file)) { | |
414 | /* drop dentry, keep inode for a bit */ | |
415 | ihold(d_inode(path.dentry)); | |
416 | path_put(&path); | |
417 | /* ... and now kill it properly */ | |
418 | sock_release(sock); | |
419 | return file; | |
420 | } | |
421 | ||
422 | sock->file = file; | |
423 | file->f_flags = O_RDWR | (flags & O_NONBLOCK); | |
424 | file->private_data = sock; | |
425 | return file; | |
426 | } | |
427 | EXPORT_SYMBOL(sock_alloc_file); | |
428 | ||
429 | static int sock_map_fd(struct socket *sock, int flags) | |
430 | { | |
431 | struct file *newfile; | |
432 | int fd = get_unused_fd_flags(flags); | |
433 | if (unlikely(fd < 0)) { | |
434 | sock_release(sock); | |
435 | return fd; | |
436 | } | |
437 | ||
438 | newfile = sock_alloc_file(sock, flags, NULL); | |
439 | if (likely(!IS_ERR(newfile))) { | |
440 | fd_install(fd, newfile); | |
441 | return fd; | |
442 | } | |
443 | ||
444 | put_unused_fd(fd); | |
445 | return PTR_ERR(newfile); | |
446 | } | |
447 | ||
448 | struct socket *sock_from_file(struct file *file, int *err) | |
449 | { | |
450 | if (file->f_op == &socket_file_ops) | |
451 | return file->private_data; /* set in sock_map_fd */ | |
452 | ||
453 | *err = -ENOTSOCK; | |
454 | return NULL; | |
455 | } | |
456 | EXPORT_SYMBOL(sock_from_file); | |
457 | ||
458 | /** | |
459 | * sockfd_lookup - Go from a file number to its socket slot | |
460 | * @fd: file handle | |
461 | * @err: pointer to an error code return | |
462 | * | |
463 | * The file handle passed in is locked and the socket it is bound | |
464 | * to is returned. If an error occurs the err pointer is overwritten | |
465 | * with a negative errno code and NULL is returned. The function checks | |
466 | * for both invalid handles and passing a handle which is not a socket. | |
467 | * | |
468 | * On a success the socket object pointer is returned. | |
469 | */ | |
470 | ||
471 | struct socket *sockfd_lookup(int fd, int *err) | |
472 | { | |
473 | struct file *file; | |
474 | struct socket *sock; | |
475 | ||
476 | file = fget(fd); | |
477 | if (!file) { | |
478 | *err = -EBADF; | |
479 | return NULL; | |
480 | } | |
481 | ||
482 | sock = sock_from_file(file, err); | |
483 | if (!sock) | |
484 | fput(file); | |
485 | return sock; | |
486 | } | |
487 | EXPORT_SYMBOL(sockfd_lookup); | |
488 | ||
489 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) | |
490 | { | |
491 | struct fd f = fdget(fd); | |
492 | struct socket *sock; | |
493 | ||
494 | *err = -EBADF; | |
495 | if (f.file) { | |
496 | sock = sock_from_file(f.file, err); | |
497 | if (likely(sock)) { | |
498 | *fput_needed = f.flags; | |
499 | return sock; | |
500 | } | |
501 | fdput(f); | |
502 | } | |
503 | return NULL; | |
504 | } | |
505 | ||
506 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, | |
507 | size_t size) | |
508 | { | |
509 | ssize_t len; | |
510 | ssize_t used = 0; | |
511 | ||
512 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); | |
513 | if (len < 0) | |
514 | return len; | |
515 | used += len; | |
516 | if (buffer) { | |
517 | if (size < used) | |
518 | return -ERANGE; | |
519 | buffer += len; | |
520 | } | |
521 | ||
522 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
523 | used += len; | |
524 | if (buffer) { | |
525 | if (size < used) | |
526 | return -ERANGE; | |
527 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
528 | buffer += len; | |
529 | } | |
530 | ||
531 | return used; | |
532 | } | |
533 | ||
534 | static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
535 | { | |
536 | int err = simple_setattr(dentry, iattr); | |
537 | ||
538 | if (!err && (iattr->ia_valid & ATTR_UID)) { | |
539 | struct socket *sock = SOCKET_I(d_inode(dentry)); | |
540 | ||
541 | sock->sk->sk_uid = iattr->ia_uid; | |
542 | } | |
543 | ||
544 | return err; | |
545 | } | |
546 | ||
547 | static const struct inode_operations sockfs_inode_ops = { | |
548 | .listxattr = sockfs_listxattr, | |
549 | .setattr = sockfs_setattr, | |
550 | }; | |
551 | ||
552 | /** | |
553 | * sock_alloc - allocate a socket | |
554 | * | |
555 | * Allocate a new inode and socket object. The two are bound together | |
556 | * and initialised. The socket is then returned. If we are out of inodes | |
557 | * NULL is returned. | |
558 | */ | |
559 | ||
560 | struct socket *sock_alloc(void) | |
561 | { | |
562 | struct inode *inode; | |
563 | struct socket *sock; | |
564 | ||
565 | inode = new_inode_pseudo(sock_mnt->mnt_sb); | |
566 | if (!inode) | |
567 | return NULL; | |
568 | ||
569 | sock = SOCKET_I(inode); | |
570 | ||
571 | inode->i_ino = get_next_ino(); | |
572 | inode->i_mode = S_IFSOCK | S_IRWXUGO; | |
573 | inode->i_uid = current_fsuid(); | |
574 | inode->i_gid = current_fsgid(); | |
575 | inode->i_op = &sockfs_inode_ops; | |
576 | ||
577 | return sock; | |
578 | } | |
579 | EXPORT_SYMBOL(sock_alloc); | |
580 | ||
581 | /** | |
582 | * sock_release - close a socket | |
583 | * @sock: socket to close | |
584 | * | |
585 | * The socket is released from the protocol stack if it has a release | |
586 | * callback, and the inode is then released if the socket is bound to | |
587 | * an inode not a file. | |
588 | */ | |
589 | ||
590 | void sock_release(struct socket *sock) | |
591 | { | |
592 | if (sock->ops) { | |
593 | struct module *owner = sock->ops->owner; | |
594 | ||
595 | sock->ops->release(sock); | |
596 | sock->ops = NULL; | |
597 | module_put(owner); | |
598 | } | |
599 | ||
600 | if (rcu_dereference_protected(sock->wq, 1)->fasync_list) | |
601 | pr_err("%s: fasync list not empty!\n", __func__); | |
602 | ||
603 | if (!sock->file) { | |
604 | iput(SOCK_INODE(sock)); | |
605 | return; | |
606 | } | |
607 | sock->file = NULL; | |
608 | } | |
609 | EXPORT_SYMBOL(sock_release); | |
610 | ||
611 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) | |
612 | { | |
613 | u8 flags = *tx_flags; | |
614 | ||
615 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) | |
616 | flags |= SKBTX_HW_TSTAMP; | |
617 | ||
618 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) | |
619 | flags |= SKBTX_SW_TSTAMP; | |
620 | ||
621 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) | |
622 | flags |= SKBTX_SCHED_TSTAMP; | |
623 | ||
624 | *tx_flags = flags; | |
625 | } | |
626 | EXPORT_SYMBOL(__sock_tx_timestamp); | |
627 | ||
628 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) | |
629 | { | |
630 | int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); | |
631 | BUG_ON(ret == -EIOCBQUEUED); | |
632 | return ret; | |
633 | } | |
634 | ||
635 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) | |
636 | { | |
637 | int err = security_socket_sendmsg(sock, msg, | |
638 | msg_data_left(msg)); | |
639 | ||
640 | return err ?: sock_sendmsg_nosec(sock, msg); | |
641 | } | |
642 | EXPORT_SYMBOL(sock_sendmsg); | |
643 | ||
644 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, | |
645 | struct kvec *vec, size_t num, size_t size) | |
646 | { | |
647 | iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); | |
648 | return sock_sendmsg(sock, msg); | |
649 | } | |
650 | EXPORT_SYMBOL(kernel_sendmsg); | |
651 | ||
652 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, | |
653 | struct kvec *vec, size_t num, size_t size) | |
654 | { | |
655 | struct socket *sock = sk->sk_socket; | |
656 | ||
657 | if (!sock->ops->sendmsg_locked) | |
658 | return sock_no_sendmsg_locked(sk, msg, size); | |
659 | ||
660 | iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); | |
661 | ||
662 | return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); | |
663 | } | |
664 | EXPORT_SYMBOL(kernel_sendmsg_locked); | |
665 | ||
666 | static bool skb_is_err_queue(const struct sk_buff *skb) | |
667 | { | |
668 | /* pkt_type of skbs enqueued on the error queue are set to | |
669 | * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do | |
670 | * in recvmsg, since skbs received on a local socket will never | |
671 | * have a pkt_type of PACKET_OUTGOING. | |
672 | */ | |
673 | return skb->pkt_type == PACKET_OUTGOING; | |
674 | } | |
675 | ||
676 | /* On transmit, software and hardware timestamps are returned independently. | |
677 | * As the two skb clones share the hardware timestamp, which may be updated | |
678 | * before the software timestamp is received, a hardware TX timestamp may be | |
679 | * returned only if there is no software TX timestamp. Ignore false software | |
680 | * timestamps, which may be made in the __sock_recv_timestamp() call when the | |
681 | * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a | |
682 | * hardware timestamp. | |
683 | */ | |
684 | static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) | |
685 | { | |
686 | return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); | |
687 | } | |
688 | ||
689 | static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
690 | { | |
691 | struct scm_ts_pktinfo ts_pktinfo; | |
692 | struct net_device *orig_dev; | |
693 | ||
694 | if (!skb_mac_header_was_set(skb)) | |
695 | return; | |
696 | ||
697 | memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); | |
698 | ||
699 | rcu_read_lock(); | |
700 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
701 | if (orig_dev) | |
702 | ts_pktinfo.if_index = orig_dev->ifindex; | |
703 | rcu_read_unlock(); | |
704 | ||
705 | ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); | |
706 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, | |
707 | sizeof(ts_pktinfo), &ts_pktinfo); | |
708 | } | |
709 | ||
710 | /* | |
711 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
712 | */ | |
713 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
714 | struct sk_buff *skb) | |
715 | { | |
716 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); | |
717 | struct scm_timestamping tss; | |
718 | int empty = 1, false_tstamp = 0; | |
719 | struct skb_shared_hwtstamps *shhwtstamps = | |
720 | skb_hwtstamps(skb); | |
721 | ||
722 | /* Race occurred between timestamp enabling and packet | |
723 | receiving. Fill in the current time for now. */ | |
724 | if (need_software_tstamp && skb->tstamp == 0) { | |
725 | __net_timestamp(skb); | |
726 | false_tstamp = 1; | |
727 | } | |
728 | ||
729 | if (need_software_tstamp) { | |
730 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
731 | struct timeval tv; | |
732 | skb_get_timestamp(skb, &tv); | |
733 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, | |
734 | sizeof(tv), &tv); | |
735 | } else { | |
736 | struct timespec ts; | |
737 | skb_get_timestampns(skb, &ts); | |
738 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, | |
739 | sizeof(ts), &ts); | |
740 | } | |
741 | } | |
742 | ||
743 | memset(&tss, 0, sizeof(tss)); | |
744 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && | |
745 | ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) | |
746 | empty = 0; | |
747 | if (shhwtstamps && | |
748 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && | |
749 | !skb_is_swtx_tstamp(skb, false_tstamp) && | |
750 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { | |
751 | empty = 0; | |
752 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && | |
753 | !skb_is_err_queue(skb)) | |
754 | put_ts_pktinfo(msg, skb); | |
755 | } | |
756 | if (!empty) { | |
757 | put_cmsg(msg, SOL_SOCKET, | |
758 | SCM_TIMESTAMPING, sizeof(tss), &tss); | |
759 | ||
760 | if (skb_is_err_queue(skb) && skb->len && | |
761 | SKB_EXT_ERR(skb)->opt_stats) | |
762 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, | |
763 | skb->len, skb->data); | |
764 | } | |
765 | } | |
766 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); | |
767 | ||
768 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
769 | struct sk_buff *skb) | |
770 | { | |
771 | int ack; | |
772 | ||
773 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
774 | return; | |
775 | if (!skb->wifi_acked_valid) | |
776 | return; | |
777 | ||
778 | ack = skb->wifi_acked; | |
779 | ||
780 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
781 | } | |
782 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
783 | ||
784 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, | |
785 | struct sk_buff *skb) | |
786 | { | |
787 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) | |
788 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, | |
789 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); | |
790 | } | |
791 | ||
792 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
793 | struct sk_buff *skb) | |
794 | { | |
795 | sock_recv_timestamp(msg, sk, skb); | |
796 | sock_recv_drops(msg, sk, skb); | |
797 | } | |
798 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); | |
799 | ||
800 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, | |
801 | int flags) | |
802 | { | |
803 | return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); | |
804 | } | |
805 | ||
806 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) | |
807 | { | |
808 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); | |
809 | ||
810 | return err ?: sock_recvmsg_nosec(sock, msg, flags); | |
811 | } | |
812 | EXPORT_SYMBOL(sock_recvmsg); | |
813 | ||
814 | /** | |
815 | * kernel_recvmsg - Receive a message from a socket (kernel space) | |
816 | * @sock: The socket to receive the message from | |
817 | * @msg: Received message | |
818 | * @vec: Input s/g array for message data | |
819 | * @num: Size of input s/g array | |
820 | * @size: Number of bytes to read | |
821 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
822 | * | |
823 | * On return the msg structure contains the scatter/gather array passed in the | |
824 | * vec argument. The array is modified so that it consists of the unfilled | |
825 | * portion of the original array. | |
826 | * | |
827 | * The returned value is the total number of bytes received, or an error. | |
828 | */ | |
829 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, | |
830 | struct kvec *vec, size_t num, size_t size, int flags) | |
831 | { | |
832 | mm_segment_t oldfs = get_fs(); | |
833 | int result; | |
834 | ||
835 | iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); | |
836 | set_fs(KERNEL_DS); | |
837 | result = sock_recvmsg(sock, msg, flags); | |
838 | set_fs(oldfs); | |
839 | return result; | |
840 | } | |
841 | EXPORT_SYMBOL(kernel_recvmsg); | |
842 | ||
843 | static ssize_t sock_sendpage(struct file *file, struct page *page, | |
844 | int offset, size_t size, loff_t *ppos, int more) | |
845 | { | |
846 | struct socket *sock; | |
847 | int flags; | |
848 | ||
849 | sock = file->private_data; | |
850 | ||
851 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; | |
852 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
853 | flags |= more; | |
854 | ||
855 | return kernel_sendpage(sock, page, offset, size, flags); | |
856 | } | |
857 | ||
858 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, | |
859 | struct pipe_inode_info *pipe, size_t len, | |
860 | unsigned int flags) | |
861 | { | |
862 | struct socket *sock = file->private_data; | |
863 | ||
864 | if (unlikely(!sock->ops->splice_read)) | |
865 | return -EINVAL; | |
866 | ||
867 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); | |
868 | } | |
869 | ||
870 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) | |
871 | { | |
872 | struct file *file = iocb->ki_filp; | |
873 | struct socket *sock = file->private_data; | |
874 | struct msghdr msg = {.msg_iter = *to, | |
875 | .msg_iocb = iocb}; | |
876 | ssize_t res; | |
877 | ||
878 | if (file->f_flags & O_NONBLOCK) | |
879 | msg.msg_flags = MSG_DONTWAIT; | |
880 | ||
881 | if (iocb->ki_pos != 0) | |
882 | return -ESPIPE; | |
883 | ||
884 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ | |
885 | return 0; | |
886 | ||
887 | res = sock_recvmsg(sock, &msg, msg.msg_flags); | |
888 | *to = msg.msg_iter; | |
889 | return res; | |
890 | } | |
891 | ||
892 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) | |
893 | { | |
894 | struct file *file = iocb->ki_filp; | |
895 | struct socket *sock = file->private_data; | |
896 | struct msghdr msg = {.msg_iter = *from, | |
897 | .msg_iocb = iocb}; | |
898 | ssize_t res; | |
899 | ||
900 | if (iocb->ki_pos != 0) | |
901 | return -ESPIPE; | |
902 | ||
903 | if (file->f_flags & O_NONBLOCK) | |
904 | msg.msg_flags = MSG_DONTWAIT; | |
905 | ||
906 | if (sock->type == SOCK_SEQPACKET) | |
907 | msg.msg_flags |= MSG_EOR; | |
908 | ||
909 | res = sock_sendmsg(sock, &msg); | |
910 | *from = msg.msg_iter; | |
911 | return res; | |
912 | } | |
913 | ||
914 | /* | |
915 | * Atomic setting of ioctl hooks to avoid race | |
916 | * with module unload. | |
917 | */ | |
918 | ||
919 | static DEFINE_MUTEX(br_ioctl_mutex); | |
920 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); | |
921 | ||
922 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) | |
923 | { | |
924 | mutex_lock(&br_ioctl_mutex); | |
925 | br_ioctl_hook = hook; | |
926 | mutex_unlock(&br_ioctl_mutex); | |
927 | } | |
928 | EXPORT_SYMBOL(brioctl_set); | |
929 | ||
930 | static DEFINE_MUTEX(vlan_ioctl_mutex); | |
931 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); | |
932 | ||
933 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) | |
934 | { | |
935 | mutex_lock(&vlan_ioctl_mutex); | |
936 | vlan_ioctl_hook = hook; | |
937 | mutex_unlock(&vlan_ioctl_mutex); | |
938 | } | |
939 | EXPORT_SYMBOL(vlan_ioctl_set); | |
940 | ||
941 | static DEFINE_MUTEX(dlci_ioctl_mutex); | |
942 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); | |
943 | ||
944 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) | |
945 | { | |
946 | mutex_lock(&dlci_ioctl_mutex); | |
947 | dlci_ioctl_hook = hook; | |
948 | mutex_unlock(&dlci_ioctl_mutex); | |
949 | } | |
950 | EXPORT_SYMBOL(dlci_ioctl_set); | |
951 | ||
952 | static long sock_do_ioctl(struct net *net, struct socket *sock, | |
953 | unsigned int cmd, unsigned long arg) | |
954 | { | |
955 | int err; | |
956 | void __user *argp = (void __user *)arg; | |
957 | ||
958 | err = sock->ops->ioctl(sock, cmd, arg); | |
959 | ||
960 | /* | |
961 | * If this ioctl is unknown try to hand it down | |
962 | * to the NIC driver. | |
963 | */ | |
964 | if (err != -ENOIOCTLCMD) | |
965 | return err; | |
966 | ||
967 | if (cmd == SIOCGIFCONF) { | |
968 | struct ifconf ifc; | |
969 | if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) | |
970 | return -EFAULT; | |
971 | rtnl_lock(); | |
972 | err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); | |
973 | rtnl_unlock(); | |
974 | if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) | |
975 | err = -EFAULT; | |
976 | } else { | |
977 | struct ifreq ifr; | |
978 | bool need_copyout; | |
979 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) | |
980 | return -EFAULT; | |
981 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); | |
982 | if (!err && need_copyout) | |
983 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) | |
984 | return -EFAULT; | |
985 | } | |
986 | return err; | |
987 | } | |
988 | ||
989 | /* | |
990 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
991 | * what to do with it - that's up to the protocol still. | |
992 | */ | |
993 | ||
994 | static struct ns_common *get_net_ns(struct ns_common *ns) | |
995 | { | |
996 | return &get_net(container_of(ns, struct net, ns))->ns; | |
997 | } | |
998 | ||
999 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
1000 | { | |
1001 | struct socket *sock; | |
1002 | struct sock *sk; | |
1003 | void __user *argp = (void __user *)arg; | |
1004 | int pid, err; | |
1005 | struct net *net; | |
1006 | ||
1007 | sock = file->private_data; | |
1008 | sk = sock->sk; | |
1009 | net = sock_net(sk); | |
1010 | if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { | |
1011 | struct ifreq ifr; | |
1012 | bool need_copyout; | |
1013 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) | |
1014 | return -EFAULT; | |
1015 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); | |
1016 | if (!err && need_copyout) | |
1017 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) | |
1018 | return -EFAULT; | |
1019 | } else | |
1020 | #ifdef CONFIG_WEXT_CORE | |
1021 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { | |
1022 | err = wext_handle_ioctl(net, cmd, argp); | |
1023 | } else | |
1024 | #endif | |
1025 | switch (cmd) { | |
1026 | case FIOSETOWN: | |
1027 | case SIOCSPGRP: | |
1028 | err = -EFAULT; | |
1029 | if (get_user(pid, (int __user *)argp)) | |
1030 | break; | |
1031 | err = f_setown(sock->file, pid, 1); | |
1032 | break; | |
1033 | case FIOGETOWN: | |
1034 | case SIOCGPGRP: | |
1035 | err = put_user(f_getown(sock->file), | |
1036 | (int __user *)argp); | |
1037 | break; | |
1038 | case SIOCGIFBR: | |
1039 | case SIOCSIFBR: | |
1040 | case SIOCBRADDBR: | |
1041 | case SIOCBRDELBR: | |
1042 | err = -ENOPKG; | |
1043 | if (!br_ioctl_hook) | |
1044 | request_module("bridge"); | |
1045 | ||
1046 | mutex_lock(&br_ioctl_mutex); | |
1047 | if (br_ioctl_hook) | |
1048 | err = br_ioctl_hook(net, cmd, argp); | |
1049 | mutex_unlock(&br_ioctl_mutex); | |
1050 | break; | |
1051 | case SIOCGIFVLAN: | |
1052 | case SIOCSIFVLAN: | |
1053 | err = -ENOPKG; | |
1054 | if (!vlan_ioctl_hook) | |
1055 | request_module("8021q"); | |
1056 | ||
1057 | mutex_lock(&vlan_ioctl_mutex); | |
1058 | if (vlan_ioctl_hook) | |
1059 | err = vlan_ioctl_hook(net, argp); | |
1060 | mutex_unlock(&vlan_ioctl_mutex); | |
1061 | break; | |
1062 | case SIOCADDDLCI: | |
1063 | case SIOCDELDLCI: | |
1064 | err = -ENOPKG; | |
1065 | if (!dlci_ioctl_hook) | |
1066 | request_module("dlci"); | |
1067 | ||
1068 | mutex_lock(&dlci_ioctl_mutex); | |
1069 | if (dlci_ioctl_hook) | |
1070 | err = dlci_ioctl_hook(cmd, argp); | |
1071 | mutex_unlock(&dlci_ioctl_mutex); | |
1072 | break; | |
1073 | case SIOCGSKNS: | |
1074 | err = -EPERM; | |
1075 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1076 | break; | |
1077 | ||
1078 | err = open_related_ns(&net->ns, get_net_ns); | |
1079 | break; | |
1080 | default: | |
1081 | err = sock_do_ioctl(net, sock, cmd, arg); | |
1082 | break; | |
1083 | } | |
1084 | return err; | |
1085 | } | |
1086 | ||
1087 | int sock_create_lite(int family, int type, int protocol, struct socket **res) | |
1088 | { | |
1089 | int err; | |
1090 | struct socket *sock = NULL; | |
1091 | ||
1092 | err = security_socket_create(family, type, protocol, 1); | |
1093 | if (err) | |
1094 | goto out; | |
1095 | ||
1096 | sock = sock_alloc(); | |
1097 | if (!sock) { | |
1098 | err = -ENOMEM; | |
1099 | goto out; | |
1100 | } | |
1101 | ||
1102 | sock->type = type; | |
1103 | err = security_socket_post_create(sock, family, type, protocol, 1); | |
1104 | if (err) | |
1105 | goto out_release; | |
1106 | ||
1107 | out: | |
1108 | *res = sock; | |
1109 | return err; | |
1110 | out_release: | |
1111 | sock_release(sock); | |
1112 | sock = NULL; | |
1113 | goto out; | |
1114 | } | |
1115 | EXPORT_SYMBOL(sock_create_lite); | |
1116 | ||
1117 | /* No kernel lock held - perfect */ | |
1118 | static __poll_t sock_poll(struct file *file, poll_table *wait) | |
1119 | { | |
1120 | __poll_t busy_flag = 0; | |
1121 | struct socket *sock; | |
1122 | ||
1123 | /* | |
1124 | * We can't return errors to poll, so it's either yes or no. | |
1125 | */ | |
1126 | sock = file->private_data; | |
1127 | ||
1128 | if (sk_can_busy_loop(sock->sk)) { | |
1129 | /* this socket can poll_ll so tell the system call */ | |
1130 | busy_flag = POLL_BUSY_LOOP; | |
1131 | ||
1132 | /* once, only if requested by syscall */ | |
1133 | if (wait && (wait->_key & POLL_BUSY_LOOP)) | |
1134 | sk_busy_loop(sock->sk, 1); | |
1135 | } | |
1136 | ||
1137 | return busy_flag | sock->ops->poll(file, sock, wait); | |
1138 | } | |
1139 | ||
1140 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) | |
1141 | { | |
1142 | struct socket *sock = file->private_data; | |
1143 | ||
1144 | return sock->ops->mmap(file, sock, vma); | |
1145 | } | |
1146 | ||
1147 | static int sock_close(struct inode *inode, struct file *filp) | |
1148 | { | |
1149 | sock_release(SOCKET_I(inode)); | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Update the socket async list | |
1155 | * | |
1156 | * Fasync_list locking strategy. | |
1157 | * | |
1158 | * 1. fasync_list is modified only under process context socket lock | |
1159 | * i.e. under semaphore. | |
1160 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
1161 | * or under socket lock | |
1162 | */ | |
1163 | ||
1164 | static int sock_fasync(int fd, struct file *filp, int on) | |
1165 | { | |
1166 | struct socket *sock = filp->private_data; | |
1167 | struct sock *sk = sock->sk; | |
1168 | struct socket_wq *wq; | |
1169 | ||
1170 | if (sk == NULL) | |
1171 | return -EINVAL; | |
1172 | ||
1173 | lock_sock(sk); | |
1174 | wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk)); | |
1175 | fasync_helper(fd, filp, on, &wq->fasync_list); | |
1176 | ||
1177 | if (!wq->fasync_list) | |
1178 | sock_reset_flag(sk, SOCK_FASYNC); | |
1179 | else | |
1180 | sock_set_flag(sk, SOCK_FASYNC); | |
1181 | ||
1182 | release_sock(sk); | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | /* This function may be called only under rcu_lock */ | |
1187 | ||
1188 | int sock_wake_async(struct socket_wq *wq, int how, int band) | |
1189 | { | |
1190 | if (!wq || !wq->fasync_list) | |
1191 | return -1; | |
1192 | ||
1193 | switch (how) { | |
1194 | case SOCK_WAKE_WAITD: | |
1195 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) | |
1196 | break; | |
1197 | goto call_kill; | |
1198 | case SOCK_WAKE_SPACE: | |
1199 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) | |
1200 | break; | |
1201 | /* fall through */ | |
1202 | case SOCK_WAKE_IO: | |
1203 | call_kill: | |
1204 | kill_fasync(&wq->fasync_list, SIGIO, band); | |
1205 | break; | |
1206 | case SOCK_WAKE_URG: | |
1207 | kill_fasync(&wq->fasync_list, SIGURG, band); | |
1208 | } | |
1209 | ||
1210 | return 0; | |
1211 | } | |
1212 | EXPORT_SYMBOL(sock_wake_async); | |
1213 | ||
1214 | int __sock_create(struct net *net, int family, int type, int protocol, | |
1215 | struct socket **res, int kern) | |
1216 | { | |
1217 | int err; | |
1218 | struct socket *sock; | |
1219 | const struct net_proto_family *pf; | |
1220 | ||
1221 | /* | |
1222 | * Check protocol is in range | |
1223 | */ | |
1224 | if (family < 0 || family >= NPROTO) | |
1225 | return -EAFNOSUPPORT; | |
1226 | if (type < 0 || type >= SOCK_MAX) | |
1227 | return -EINVAL; | |
1228 | ||
1229 | /* Compatibility. | |
1230 | ||
1231 | This uglymoron is moved from INET layer to here to avoid | |
1232 | deadlock in module load. | |
1233 | */ | |
1234 | if (family == PF_INET && type == SOCK_PACKET) { | |
1235 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", | |
1236 | current->comm); | |
1237 | family = PF_PACKET; | |
1238 | } | |
1239 | ||
1240 | err = security_socket_create(family, type, protocol, kern); | |
1241 | if (err) | |
1242 | return err; | |
1243 | ||
1244 | /* | |
1245 | * Allocate the socket and allow the family to set things up. if | |
1246 | * the protocol is 0, the family is instructed to select an appropriate | |
1247 | * default. | |
1248 | */ | |
1249 | sock = sock_alloc(); | |
1250 | if (!sock) { | |
1251 | net_warn_ratelimited("socket: no more sockets\n"); | |
1252 | return -ENFILE; /* Not exactly a match, but its the | |
1253 | closest posix thing */ | |
1254 | } | |
1255 | ||
1256 | sock->type = type; | |
1257 | ||
1258 | #ifdef CONFIG_MODULES | |
1259 | /* Attempt to load a protocol module if the find failed. | |
1260 | * | |
1261 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1262 | * requested real, full-featured networking support upon configuration. | |
1263 | * Otherwise module support will break! | |
1264 | */ | |
1265 | if (rcu_access_pointer(net_families[family]) == NULL) | |
1266 | request_module("net-pf-%d", family); | |
1267 | #endif | |
1268 | ||
1269 | rcu_read_lock(); | |
1270 | pf = rcu_dereference(net_families[family]); | |
1271 | err = -EAFNOSUPPORT; | |
1272 | if (!pf) | |
1273 | goto out_release; | |
1274 | ||
1275 | /* | |
1276 | * We will call the ->create function, that possibly is in a loadable | |
1277 | * module, so we have to bump that loadable module refcnt first. | |
1278 | */ | |
1279 | if (!try_module_get(pf->owner)) | |
1280 | goto out_release; | |
1281 | ||
1282 | /* Now protected by module ref count */ | |
1283 | rcu_read_unlock(); | |
1284 | ||
1285 | err = pf->create(net, sock, protocol, kern); | |
1286 | if (err < 0) | |
1287 | goto out_module_put; | |
1288 | ||
1289 | /* | |
1290 | * Now to bump the refcnt of the [loadable] module that owns this | |
1291 | * socket at sock_release time we decrement its refcnt. | |
1292 | */ | |
1293 | if (!try_module_get(sock->ops->owner)) | |
1294 | goto out_module_busy; | |
1295 | ||
1296 | /* | |
1297 | * Now that we're done with the ->create function, the [loadable] | |
1298 | * module can have its refcnt decremented | |
1299 | */ | |
1300 | module_put(pf->owner); | |
1301 | err = security_socket_post_create(sock, family, type, protocol, kern); | |
1302 | if (err) | |
1303 | goto out_sock_release; | |
1304 | *res = sock; | |
1305 | ||
1306 | return 0; | |
1307 | ||
1308 | out_module_busy: | |
1309 | err = -EAFNOSUPPORT; | |
1310 | out_module_put: | |
1311 | sock->ops = NULL; | |
1312 | module_put(pf->owner); | |
1313 | out_sock_release: | |
1314 | sock_release(sock); | |
1315 | return err; | |
1316 | ||
1317 | out_release: | |
1318 | rcu_read_unlock(); | |
1319 | goto out_sock_release; | |
1320 | } | |
1321 | EXPORT_SYMBOL(__sock_create); | |
1322 | ||
1323 | int sock_create(int family, int type, int protocol, struct socket **res) | |
1324 | { | |
1325 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); | |
1326 | } | |
1327 | EXPORT_SYMBOL(sock_create); | |
1328 | ||
1329 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) | |
1330 | { | |
1331 | return __sock_create(net, family, type, protocol, res, 1); | |
1332 | } | |
1333 | EXPORT_SYMBOL(sock_create_kern); | |
1334 | ||
1335 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) | |
1336 | { | |
1337 | int retval; | |
1338 | struct socket *sock; | |
1339 | int flags; | |
1340 | ||
1341 | /* Check the SOCK_* constants for consistency. */ | |
1342 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1343 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1344 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1345 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1346 | ||
1347 | flags = type & ~SOCK_TYPE_MASK; | |
1348 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1349 | return -EINVAL; | |
1350 | type &= SOCK_TYPE_MASK; | |
1351 | ||
1352 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1353 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1354 | ||
1355 | retval = sock_create(family, type, protocol, &sock); | |
1356 | if (retval < 0) | |
1357 | return retval; | |
1358 | ||
1359 | return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); | |
1360 | } | |
1361 | ||
1362 | /* | |
1363 | * Create a pair of connected sockets. | |
1364 | */ | |
1365 | ||
1366 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, | |
1367 | int __user *, usockvec) | |
1368 | { | |
1369 | struct socket *sock1, *sock2; | |
1370 | int fd1, fd2, err; | |
1371 | struct file *newfile1, *newfile2; | |
1372 | int flags; | |
1373 | ||
1374 | flags = type & ~SOCK_TYPE_MASK; | |
1375 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1376 | return -EINVAL; | |
1377 | type &= SOCK_TYPE_MASK; | |
1378 | ||
1379 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1380 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1381 | ||
1382 | /* | |
1383 | * reserve descriptors and make sure we won't fail | |
1384 | * to return them to userland. | |
1385 | */ | |
1386 | fd1 = get_unused_fd_flags(flags); | |
1387 | if (unlikely(fd1 < 0)) | |
1388 | return fd1; | |
1389 | ||
1390 | fd2 = get_unused_fd_flags(flags); | |
1391 | if (unlikely(fd2 < 0)) { | |
1392 | put_unused_fd(fd1); | |
1393 | return fd2; | |
1394 | } | |
1395 | ||
1396 | err = put_user(fd1, &usockvec[0]); | |
1397 | if (err) | |
1398 | goto out; | |
1399 | ||
1400 | err = put_user(fd2, &usockvec[1]); | |
1401 | if (err) | |
1402 | goto out; | |
1403 | ||
1404 | /* | |
1405 | * Obtain the first socket and check if the underlying protocol | |
1406 | * supports the socketpair call. | |
1407 | */ | |
1408 | ||
1409 | err = sock_create(family, type, protocol, &sock1); | |
1410 | if (unlikely(err < 0)) | |
1411 | goto out; | |
1412 | ||
1413 | err = sock_create(family, type, protocol, &sock2); | |
1414 | if (unlikely(err < 0)) { | |
1415 | sock_release(sock1); | |
1416 | goto out; | |
1417 | } | |
1418 | ||
1419 | err = sock1->ops->socketpair(sock1, sock2); | |
1420 | if (unlikely(err < 0)) { | |
1421 | sock_release(sock2); | |
1422 | sock_release(sock1); | |
1423 | goto out; | |
1424 | } | |
1425 | ||
1426 | newfile1 = sock_alloc_file(sock1, flags, NULL); | |
1427 | if (IS_ERR(newfile1)) { | |
1428 | err = PTR_ERR(newfile1); | |
1429 | sock_release(sock2); | |
1430 | goto out; | |
1431 | } | |
1432 | ||
1433 | newfile2 = sock_alloc_file(sock2, flags, NULL); | |
1434 | if (IS_ERR(newfile2)) { | |
1435 | err = PTR_ERR(newfile2); | |
1436 | fput(newfile1); | |
1437 | goto out; | |
1438 | } | |
1439 | ||
1440 | audit_fd_pair(fd1, fd2); | |
1441 | ||
1442 | fd_install(fd1, newfile1); | |
1443 | fd_install(fd2, newfile2); | |
1444 | return 0; | |
1445 | ||
1446 | out: | |
1447 | put_unused_fd(fd2); | |
1448 | put_unused_fd(fd1); | |
1449 | return err; | |
1450 | } | |
1451 | ||
1452 | /* | |
1453 | * Bind a name to a socket. Nothing much to do here since it's | |
1454 | * the protocol's responsibility to handle the local address. | |
1455 | * | |
1456 | * We move the socket address to kernel space before we call | |
1457 | * the protocol layer (having also checked the address is ok). | |
1458 | */ | |
1459 | ||
1460 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) | |
1461 | { | |
1462 | struct socket *sock; | |
1463 | struct sockaddr_storage address; | |
1464 | int err, fput_needed; | |
1465 | ||
1466 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1467 | if (sock) { | |
1468 | err = move_addr_to_kernel(umyaddr, addrlen, &address); | |
1469 | if (err >= 0) { | |
1470 | err = security_socket_bind(sock, | |
1471 | (struct sockaddr *)&address, | |
1472 | addrlen); | |
1473 | if (!err) | |
1474 | err = sock->ops->bind(sock, | |
1475 | (struct sockaddr *) | |
1476 | &address, addrlen); | |
1477 | } | |
1478 | fput_light(sock->file, fput_needed); | |
1479 | } | |
1480 | return err; | |
1481 | } | |
1482 | ||
1483 | /* | |
1484 | * Perform a listen. Basically, we allow the protocol to do anything | |
1485 | * necessary for a listen, and if that works, we mark the socket as | |
1486 | * ready for listening. | |
1487 | */ | |
1488 | ||
1489 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) | |
1490 | { | |
1491 | struct socket *sock; | |
1492 | int err, fput_needed; | |
1493 | int somaxconn; | |
1494 | ||
1495 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1496 | if (sock) { | |
1497 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; | |
1498 | if ((unsigned int)backlog > somaxconn) | |
1499 | backlog = somaxconn; | |
1500 | ||
1501 | err = security_socket_listen(sock, backlog); | |
1502 | if (!err) | |
1503 | err = sock->ops->listen(sock, backlog); | |
1504 | ||
1505 | fput_light(sock->file, fput_needed); | |
1506 | } | |
1507 | return err; | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * For accept, we attempt to create a new socket, set up the link | |
1512 | * with the client, wake up the client, then return the new | |
1513 | * connected fd. We collect the address of the connector in kernel | |
1514 | * space and move it to user at the very end. This is unclean because | |
1515 | * we open the socket then return an error. | |
1516 | * | |
1517 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1518 | * status to recvmsg. We need to add that support in a way thats | |
1519 | * clean when we restucture accept also. | |
1520 | */ | |
1521 | ||
1522 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1523 | int __user *, upeer_addrlen, int, flags) | |
1524 | { | |
1525 | struct socket *sock, *newsock; | |
1526 | struct file *newfile; | |
1527 | int err, len, newfd, fput_needed; | |
1528 | struct sockaddr_storage address; | |
1529 | ||
1530 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1531 | return -EINVAL; | |
1532 | ||
1533 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1534 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1535 | ||
1536 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1537 | if (!sock) | |
1538 | goto out; | |
1539 | ||
1540 | err = -ENFILE; | |
1541 | newsock = sock_alloc(); | |
1542 | if (!newsock) | |
1543 | goto out_put; | |
1544 | ||
1545 | newsock->type = sock->type; | |
1546 | newsock->ops = sock->ops; | |
1547 | ||
1548 | /* | |
1549 | * We don't need try_module_get here, as the listening socket (sock) | |
1550 | * has the protocol module (sock->ops->owner) held. | |
1551 | */ | |
1552 | __module_get(newsock->ops->owner); | |
1553 | ||
1554 | newfd = get_unused_fd_flags(flags); | |
1555 | if (unlikely(newfd < 0)) { | |
1556 | err = newfd; | |
1557 | sock_release(newsock); | |
1558 | goto out_put; | |
1559 | } | |
1560 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); | |
1561 | if (IS_ERR(newfile)) { | |
1562 | err = PTR_ERR(newfile); | |
1563 | put_unused_fd(newfd); | |
1564 | goto out_put; | |
1565 | } | |
1566 | ||
1567 | err = security_socket_accept(sock, newsock); | |
1568 | if (err) | |
1569 | goto out_fd; | |
1570 | ||
1571 | err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); | |
1572 | if (err < 0) | |
1573 | goto out_fd; | |
1574 | ||
1575 | if (upeer_sockaddr) { | |
1576 | if (newsock->ops->getname(newsock, (struct sockaddr *)&address, | |
1577 | &len, 2) < 0) { | |
1578 | err = -ECONNABORTED; | |
1579 | goto out_fd; | |
1580 | } | |
1581 | err = move_addr_to_user(&address, | |
1582 | len, upeer_sockaddr, upeer_addrlen); | |
1583 | if (err < 0) | |
1584 | goto out_fd; | |
1585 | } | |
1586 | ||
1587 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1588 | ||
1589 | fd_install(newfd, newfile); | |
1590 | err = newfd; | |
1591 | ||
1592 | out_put: | |
1593 | fput_light(sock->file, fput_needed); | |
1594 | out: | |
1595 | return err; | |
1596 | out_fd: | |
1597 | fput(newfile); | |
1598 | put_unused_fd(newfd); | |
1599 | goto out_put; | |
1600 | } | |
1601 | ||
1602 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, | |
1603 | int __user *, upeer_addrlen) | |
1604 | { | |
1605 | return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); | |
1606 | } | |
1607 | ||
1608 | /* | |
1609 | * Attempt to connect to a socket with the server address. The address | |
1610 | * is in user space so we verify it is OK and move it to kernel space. | |
1611 | * | |
1612 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1613 | * break bindings | |
1614 | * | |
1615 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1616 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1617 | * include the -EINPROGRESS status for such sockets. | |
1618 | */ | |
1619 | ||
1620 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, | |
1621 | int, addrlen) | |
1622 | { | |
1623 | struct socket *sock; | |
1624 | struct sockaddr_storage address; | |
1625 | int err, fput_needed; | |
1626 | ||
1627 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1628 | if (!sock) | |
1629 | goto out; | |
1630 | err = move_addr_to_kernel(uservaddr, addrlen, &address); | |
1631 | if (err < 0) | |
1632 | goto out_put; | |
1633 | ||
1634 | err = | |
1635 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); | |
1636 | if (err) | |
1637 | goto out_put; | |
1638 | ||
1639 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, | |
1640 | sock->file->f_flags); | |
1641 | out_put: | |
1642 | fput_light(sock->file, fput_needed); | |
1643 | out: | |
1644 | return err; | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * Get the local address ('name') of a socket object. Move the obtained | |
1649 | * name to user space. | |
1650 | */ | |
1651 | ||
1652 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, | |
1653 | int __user *, usockaddr_len) | |
1654 | { | |
1655 | struct socket *sock; | |
1656 | struct sockaddr_storage address; | |
1657 | int len, err, fput_needed; | |
1658 | ||
1659 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1660 | if (!sock) | |
1661 | goto out; | |
1662 | ||
1663 | err = security_socket_getsockname(sock); | |
1664 | if (err) | |
1665 | goto out_put; | |
1666 | ||
1667 | err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); | |
1668 | if (err) | |
1669 | goto out_put; | |
1670 | err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); | |
1671 | ||
1672 | out_put: | |
1673 | fput_light(sock->file, fput_needed); | |
1674 | out: | |
1675 | return err; | |
1676 | } | |
1677 | ||
1678 | /* | |
1679 | * Get the remote address ('name') of a socket object. Move the obtained | |
1680 | * name to user space. | |
1681 | */ | |
1682 | ||
1683 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, | |
1684 | int __user *, usockaddr_len) | |
1685 | { | |
1686 | struct socket *sock; | |
1687 | struct sockaddr_storage address; | |
1688 | int len, err, fput_needed; | |
1689 | ||
1690 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1691 | if (sock != NULL) { | |
1692 | err = security_socket_getpeername(sock); | |
1693 | if (err) { | |
1694 | fput_light(sock->file, fput_needed); | |
1695 | return err; | |
1696 | } | |
1697 | ||
1698 | err = | |
1699 | sock->ops->getname(sock, (struct sockaddr *)&address, &len, | |
1700 | 1); | |
1701 | if (!err) | |
1702 | err = move_addr_to_user(&address, len, usockaddr, | |
1703 | usockaddr_len); | |
1704 | fput_light(sock->file, fput_needed); | |
1705 | } | |
1706 | return err; | |
1707 | } | |
1708 | ||
1709 | /* | |
1710 | * Send a datagram to a given address. We move the address into kernel | |
1711 | * space and check the user space data area is readable before invoking | |
1712 | * the protocol. | |
1713 | */ | |
1714 | ||
1715 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, | |
1716 | unsigned int, flags, struct sockaddr __user *, addr, | |
1717 | int, addr_len) | |
1718 | { | |
1719 | struct socket *sock; | |
1720 | struct sockaddr_storage address; | |
1721 | int err; | |
1722 | struct msghdr msg; | |
1723 | struct iovec iov; | |
1724 | int fput_needed; | |
1725 | ||
1726 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); | |
1727 | if (unlikely(err)) | |
1728 | return err; | |
1729 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1730 | if (!sock) | |
1731 | goto out; | |
1732 | ||
1733 | msg.msg_name = NULL; | |
1734 | msg.msg_control = NULL; | |
1735 | msg.msg_controllen = 0; | |
1736 | msg.msg_namelen = 0; | |
1737 | if (addr) { | |
1738 | err = move_addr_to_kernel(addr, addr_len, &address); | |
1739 | if (err < 0) | |
1740 | goto out_put; | |
1741 | msg.msg_name = (struct sockaddr *)&address; | |
1742 | msg.msg_namelen = addr_len; | |
1743 | } | |
1744 | if (sock->file->f_flags & O_NONBLOCK) | |
1745 | flags |= MSG_DONTWAIT; | |
1746 | msg.msg_flags = flags; | |
1747 | err = sock_sendmsg(sock, &msg); | |
1748 | ||
1749 | out_put: | |
1750 | fput_light(sock->file, fput_needed); | |
1751 | out: | |
1752 | return err; | |
1753 | } | |
1754 | ||
1755 | /* | |
1756 | * Send a datagram down a socket. | |
1757 | */ | |
1758 | ||
1759 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, | |
1760 | unsigned int, flags) | |
1761 | { | |
1762 | return sys_sendto(fd, buff, len, flags, NULL, 0); | |
1763 | } | |
1764 | ||
1765 | /* | |
1766 | * Receive a frame from the socket and optionally record the address of the | |
1767 | * sender. We verify the buffers are writable and if needed move the | |
1768 | * sender address from kernel to user space. | |
1769 | */ | |
1770 | ||
1771 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, | |
1772 | unsigned int, flags, struct sockaddr __user *, addr, | |
1773 | int __user *, addr_len) | |
1774 | { | |
1775 | struct socket *sock; | |
1776 | struct iovec iov; | |
1777 | struct msghdr msg; | |
1778 | struct sockaddr_storage address; | |
1779 | int err, err2; | |
1780 | int fput_needed; | |
1781 | ||
1782 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); | |
1783 | if (unlikely(err)) | |
1784 | return err; | |
1785 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1786 | if (!sock) | |
1787 | goto out; | |
1788 | ||
1789 | msg.msg_control = NULL; | |
1790 | msg.msg_controllen = 0; | |
1791 | /* Save some cycles and don't copy the address if not needed */ | |
1792 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; | |
1793 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
1794 | msg.msg_namelen = 0; | |
1795 | msg.msg_iocb = NULL; | |
1796 | msg.msg_flags = 0; | |
1797 | if (sock->file->f_flags & O_NONBLOCK) | |
1798 | flags |= MSG_DONTWAIT; | |
1799 | err = sock_recvmsg(sock, &msg, flags); | |
1800 | ||
1801 | if (err >= 0 && addr != NULL) { | |
1802 | err2 = move_addr_to_user(&address, | |
1803 | msg.msg_namelen, addr, addr_len); | |
1804 | if (err2 < 0) | |
1805 | err = err2; | |
1806 | } | |
1807 | ||
1808 | fput_light(sock->file, fput_needed); | |
1809 | out: | |
1810 | return err; | |
1811 | } | |
1812 | ||
1813 | /* | |
1814 | * Receive a datagram from a socket. | |
1815 | */ | |
1816 | ||
1817 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, | |
1818 | unsigned int, flags) | |
1819 | { | |
1820 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); | |
1821 | } | |
1822 | ||
1823 | /* | |
1824 | * Set a socket option. Because we don't know the option lengths we have | |
1825 | * to pass the user mode parameter for the protocols to sort out. | |
1826 | */ | |
1827 | ||
1828 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, | |
1829 | char __user *, optval, int, optlen) | |
1830 | { | |
1831 | int err, fput_needed; | |
1832 | struct socket *sock; | |
1833 | ||
1834 | if (optlen < 0) | |
1835 | return -EINVAL; | |
1836 | ||
1837 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1838 | if (sock != NULL) { | |
1839 | err = security_socket_setsockopt(sock, level, optname); | |
1840 | if (err) | |
1841 | goto out_put; | |
1842 | ||
1843 | if (level == SOL_SOCKET) | |
1844 | err = | |
1845 | sock_setsockopt(sock, level, optname, optval, | |
1846 | optlen); | |
1847 | else | |
1848 | err = | |
1849 | sock->ops->setsockopt(sock, level, optname, optval, | |
1850 | optlen); | |
1851 | out_put: | |
1852 | fput_light(sock->file, fput_needed); | |
1853 | } | |
1854 | return err; | |
1855 | } | |
1856 | ||
1857 | /* | |
1858 | * Get a socket option. Because we don't know the option lengths we have | |
1859 | * to pass a user mode parameter for the protocols to sort out. | |
1860 | */ | |
1861 | ||
1862 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, | |
1863 | char __user *, optval, int __user *, optlen) | |
1864 | { | |
1865 | int err, fput_needed; | |
1866 | struct socket *sock; | |
1867 | ||
1868 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1869 | if (sock != NULL) { | |
1870 | err = security_socket_getsockopt(sock, level, optname); | |
1871 | if (err) | |
1872 | goto out_put; | |
1873 | ||
1874 | if (level == SOL_SOCKET) | |
1875 | err = | |
1876 | sock_getsockopt(sock, level, optname, optval, | |
1877 | optlen); | |
1878 | else | |
1879 | err = | |
1880 | sock->ops->getsockopt(sock, level, optname, optval, | |
1881 | optlen); | |
1882 | out_put: | |
1883 | fput_light(sock->file, fput_needed); | |
1884 | } | |
1885 | return err; | |
1886 | } | |
1887 | ||
1888 | /* | |
1889 | * Shutdown a socket. | |
1890 | */ | |
1891 | ||
1892 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) | |
1893 | { | |
1894 | int err, fput_needed; | |
1895 | struct socket *sock; | |
1896 | ||
1897 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1898 | if (sock != NULL) { | |
1899 | err = security_socket_shutdown(sock, how); | |
1900 | if (!err) | |
1901 | err = sock->ops->shutdown(sock, how); | |
1902 | fput_light(sock->file, fput_needed); | |
1903 | } | |
1904 | return err; | |
1905 | } | |
1906 | ||
1907 | /* A couple of helpful macros for getting the address of the 32/64 bit | |
1908 | * fields which are the same type (int / unsigned) on our platforms. | |
1909 | */ | |
1910 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
1911 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
1912 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
1913 | ||
1914 | struct used_address { | |
1915 | struct sockaddr_storage name; | |
1916 | unsigned int name_len; | |
1917 | }; | |
1918 | ||
1919 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
1920 | struct user_msghdr __user *umsg, | |
1921 | struct sockaddr __user **save_addr, | |
1922 | struct iovec **iov) | |
1923 | { | |
1924 | struct user_msghdr msg; | |
1925 | ssize_t err; | |
1926 | ||
1927 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) | |
1928 | return -EFAULT; | |
1929 | ||
1930 | kmsg->msg_control = (void __force *)msg.msg_control; | |
1931 | kmsg->msg_controllen = msg.msg_controllen; | |
1932 | kmsg->msg_flags = msg.msg_flags; | |
1933 | ||
1934 | kmsg->msg_namelen = msg.msg_namelen; | |
1935 | if (!msg.msg_name) | |
1936 | kmsg->msg_namelen = 0; | |
1937 | ||
1938 | if (kmsg->msg_namelen < 0) | |
1939 | return -EINVAL; | |
1940 | ||
1941 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) | |
1942 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); | |
1943 | ||
1944 | if (save_addr) | |
1945 | *save_addr = msg.msg_name; | |
1946 | ||
1947 | if (msg.msg_name && kmsg->msg_namelen) { | |
1948 | if (!save_addr) { | |
1949 | err = move_addr_to_kernel(msg.msg_name, | |
1950 | kmsg->msg_namelen, | |
1951 | kmsg->msg_name); | |
1952 | if (err < 0) | |
1953 | return err; | |
1954 | } | |
1955 | } else { | |
1956 | kmsg->msg_name = NULL; | |
1957 | kmsg->msg_namelen = 0; | |
1958 | } | |
1959 | ||
1960 | if (msg.msg_iovlen > UIO_MAXIOV) | |
1961 | return -EMSGSIZE; | |
1962 | ||
1963 | kmsg->msg_iocb = NULL; | |
1964 | ||
1965 | return import_iovec(save_addr ? READ : WRITE, | |
1966 | msg.msg_iov, msg.msg_iovlen, | |
1967 | UIO_FASTIOV, iov, &kmsg->msg_iter); | |
1968 | } | |
1969 | ||
1970 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
1971 | struct msghdr *msg_sys, unsigned int flags, | |
1972 | struct used_address *used_address, | |
1973 | unsigned int allowed_msghdr_flags) | |
1974 | { | |
1975 | struct compat_msghdr __user *msg_compat = | |
1976 | (struct compat_msghdr __user *)msg; | |
1977 | struct sockaddr_storage address; | |
1978 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1979 | unsigned char ctl[sizeof(struct cmsghdr) + 20] | |
1980 | __aligned(sizeof(__kernel_size_t)); | |
1981 | /* 20 is size of ipv6_pktinfo */ | |
1982 | unsigned char *ctl_buf = ctl; | |
1983 | int ctl_len; | |
1984 | ssize_t err; | |
1985 | ||
1986 | msg_sys->msg_name = &address; | |
1987 | ||
1988 | if (MSG_CMSG_COMPAT & flags) | |
1989 | err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); | |
1990 | else | |
1991 | err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); | |
1992 | if (err < 0) | |
1993 | return err; | |
1994 | ||
1995 | err = -ENOBUFS; | |
1996 | ||
1997 | if (msg_sys->msg_controllen > INT_MAX) | |
1998 | goto out_freeiov; | |
1999 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); | |
2000 | ctl_len = msg_sys->msg_controllen; | |
2001 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { | |
2002 | err = | |
2003 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, | |
2004 | sizeof(ctl)); | |
2005 | if (err) | |
2006 | goto out_freeiov; | |
2007 | ctl_buf = msg_sys->msg_control; | |
2008 | ctl_len = msg_sys->msg_controllen; | |
2009 | } else if (ctl_len) { | |
2010 | BUILD_BUG_ON(sizeof(struct cmsghdr) != | |
2011 | CMSG_ALIGN(sizeof(struct cmsghdr))); | |
2012 | if (ctl_len > sizeof(ctl)) { | |
2013 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); | |
2014 | if (ctl_buf == NULL) | |
2015 | goto out_freeiov; | |
2016 | } | |
2017 | err = -EFAULT; | |
2018 | /* | |
2019 | * Careful! Before this, msg_sys->msg_control contains a user pointer. | |
2020 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted | |
2021 | * checking falls down on this. | |
2022 | */ | |
2023 | if (copy_from_user(ctl_buf, | |
2024 | (void __user __force *)msg_sys->msg_control, | |
2025 | ctl_len)) | |
2026 | goto out_freectl; | |
2027 | msg_sys->msg_control = ctl_buf; | |
2028 | } | |
2029 | msg_sys->msg_flags = flags; | |
2030 | ||
2031 | if (sock->file->f_flags & O_NONBLOCK) | |
2032 | msg_sys->msg_flags |= MSG_DONTWAIT; | |
2033 | /* | |
2034 | * If this is sendmmsg() and current destination address is same as | |
2035 | * previously succeeded address, omit asking LSM's decision. | |
2036 | * used_address->name_len is initialized to UINT_MAX so that the first | |
2037 | * destination address never matches. | |
2038 | */ | |
2039 | if (used_address && msg_sys->msg_name && | |
2040 | used_address->name_len == msg_sys->msg_namelen && | |
2041 | !memcmp(&used_address->name, msg_sys->msg_name, | |
2042 | used_address->name_len)) { | |
2043 | err = sock_sendmsg_nosec(sock, msg_sys); | |
2044 | goto out_freectl; | |
2045 | } | |
2046 | err = sock_sendmsg(sock, msg_sys); | |
2047 | /* | |
2048 | * If this is sendmmsg() and sending to current destination address was | |
2049 | * successful, remember it. | |
2050 | */ | |
2051 | if (used_address && err >= 0) { | |
2052 | used_address->name_len = msg_sys->msg_namelen; | |
2053 | if (msg_sys->msg_name) | |
2054 | memcpy(&used_address->name, msg_sys->msg_name, | |
2055 | used_address->name_len); | |
2056 | } | |
2057 | ||
2058 | out_freectl: | |
2059 | if (ctl_buf != ctl) | |
2060 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); | |
2061 | out_freeiov: | |
2062 | kfree(iov); | |
2063 | return err; | |
2064 | } | |
2065 | ||
2066 | /* | |
2067 | * BSD sendmsg interface | |
2068 | */ | |
2069 | ||
2070 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) | |
2071 | { | |
2072 | int fput_needed, err; | |
2073 | struct msghdr msg_sys; | |
2074 | struct socket *sock; | |
2075 | ||
2076 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2077 | if (!sock) | |
2078 | goto out; | |
2079 | ||
2080 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); | |
2081 | ||
2082 | fput_light(sock->file, fput_needed); | |
2083 | out: | |
2084 | return err; | |
2085 | } | |
2086 | ||
2087 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) | |
2088 | { | |
2089 | if (flags & MSG_CMSG_COMPAT) | |
2090 | return -EINVAL; | |
2091 | return __sys_sendmsg(fd, msg, flags); | |
2092 | } | |
2093 | ||
2094 | /* | |
2095 | * Linux sendmmsg interface | |
2096 | */ | |
2097 | ||
2098 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
2099 | unsigned int flags) | |
2100 | { | |
2101 | int fput_needed, err, datagrams; | |
2102 | struct socket *sock; | |
2103 | struct mmsghdr __user *entry; | |
2104 | struct compat_mmsghdr __user *compat_entry; | |
2105 | struct msghdr msg_sys; | |
2106 | struct used_address used_address; | |
2107 | unsigned int oflags = flags; | |
2108 | ||
2109 | if (vlen > UIO_MAXIOV) | |
2110 | vlen = UIO_MAXIOV; | |
2111 | ||
2112 | datagrams = 0; | |
2113 | ||
2114 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2115 | if (!sock) | |
2116 | return err; | |
2117 | ||
2118 | used_address.name_len = UINT_MAX; | |
2119 | entry = mmsg; | |
2120 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
2121 | err = 0; | |
2122 | flags |= MSG_BATCH; | |
2123 | ||
2124 | while (datagrams < vlen) { | |
2125 | if (datagrams == vlen - 1) | |
2126 | flags = oflags; | |
2127 | ||
2128 | if (MSG_CMSG_COMPAT & flags) { | |
2129 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, | |
2130 | &msg_sys, flags, &used_address, MSG_EOR); | |
2131 | if (err < 0) | |
2132 | break; | |
2133 | err = __put_user(err, &compat_entry->msg_len); | |
2134 | ++compat_entry; | |
2135 | } else { | |
2136 | err = ___sys_sendmsg(sock, | |
2137 | (struct user_msghdr __user *)entry, | |
2138 | &msg_sys, flags, &used_address, MSG_EOR); | |
2139 | if (err < 0) | |
2140 | break; | |
2141 | err = put_user(err, &entry->msg_len); | |
2142 | ++entry; | |
2143 | } | |
2144 | ||
2145 | if (err) | |
2146 | break; | |
2147 | ++datagrams; | |
2148 | if (msg_data_left(&msg_sys)) | |
2149 | break; | |
2150 | cond_resched(); | |
2151 | } | |
2152 | ||
2153 | fput_light(sock->file, fput_needed); | |
2154 | ||
2155 | /* We only return an error if no datagrams were able to be sent */ | |
2156 | if (datagrams != 0) | |
2157 | return datagrams; | |
2158 | ||
2159 | return err; | |
2160 | } | |
2161 | ||
2162 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2163 | unsigned int, vlen, unsigned int, flags) | |
2164 | { | |
2165 | if (flags & MSG_CMSG_COMPAT) | |
2166 | return -EINVAL; | |
2167 | return __sys_sendmmsg(fd, mmsg, vlen, flags); | |
2168 | } | |
2169 | ||
2170 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2171 | struct msghdr *msg_sys, unsigned int flags, int nosec) | |
2172 | { | |
2173 | struct compat_msghdr __user *msg_compat = | |
2174 | (struct compat_msghdr __user *)msg; | |
2175 | struct iovec iovstack[UIO_FASTIOV]; | |
2176 | struct iovec *iov = iovstack; | |
2177 | unsigned long cmsg_ptr; | |
2178 | int len; | |
2179 | ssize_t err; | |
2180 | ||
2181 | /* kernel mode address */ | |
2182 | struct sockaddr_storage addr; | |
2183 | ||
2184 | /* user mode address pointers */ | |
2185 | struct sockaddr __user *uaddr; | |
2186 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2187 | ||
2188 | msg_sys->msg_name = &addr; | |
2189 | ||
2190 | if (MSG_CMSG_COMPAT & flags) | |
2191 | err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); | |
2192 | else | |
2193 | err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); | |
2194 | if (err < 0) | |
2195 | return err; | |
2196 | ||
2197 | cmsg_ptr = (unsigned long)msg_sys->msg_control; | |
2198 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
2199 | ||
2200 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
2201 | msg_sys->msg_namelen = 0; | |
2202 | ||
2203 | if (sock->file->f_flags & O_NONBLOCK) | |
2204 | flags |= MSG_DONTWAIT; | |
2205 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); | |
2206 | if (err < 0) | |
2207 | goto out_freeiov; | |
2208 | len = err; | |
2209 | ||
2210 | if (uaddr != NULL) { | |
2211 | err = move_addr_to_user(&addr, | |
2212 | msg_sys->msg_namelen, uaddr, | |
2213 | uaddr_len); | |
2214 | if (err < 0) | |
2215 | goto out_freeiov; | |
2216 | } | |
2217 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), | |
2218 | COMPAT_FLAGS(msg)); | |
2219 | if (err) | |
2220 | goto out_freeiov; | |
2221 | if (MSG_CMSG_COMPAT & flags) | |
2222 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2223 | &msg_compat->msg_controllen); | |
2224 | else | |
2225 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, | |
2226 | &msg->msg_controllen); | |
2227 | if (err) | |
2228 | goto out_freeiov; | |
2229 | err = len; | |
2230 | ||
2231 | out_freeiov: | |
2232 | kfree(iov); | |
2233 | return err; | |
2234 | } | |
2235 | ||
2236 | /* | |
2237 | * BSD recvmsg interface | |
2238 | */ | |
2239 | ||
2240 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) | |
2241 | { | |
2242 | int fput_needed, err; | |
2243 | struct msghdr msg_sys; | |
2244 | struct socket *sock; | |
2245 | ||
2246 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2247 | if (!sock) | |
2248 | goto out; | |
2249 | ||
2250 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); | |
2251 | ||
2252 | fput_light(sock->file, fput_needed); | |
2253 | out: | |
2254 | return err; | |
2255 | } | |
2256 | ||
2257 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, | |
2258 | unsigned int, flags) | |
2259 | { | |
2260 | if (flags & MSG_CMSG_COMPAT) | |
2261 | return -EINVAL; | |
2262 | return __sys_recvmsg(fd, msg, flags); | |
2263 | } | |
2264 | ||
2265 | /* | |
2266 | * Linux recvmmsg interface | |
2267 | */ | |
2268 | ||
2269 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
2270 | unsigned int flags, struct timespec *timeout) | |
2271 | { | |
2272 | int fput_needed, err, datagrams; | |
2273 | struct socket *sock; | |
2274 | struct mmsghdr __user *entry; | |
2275 | struct compat_mmsghdr __user *compat_entry; | |
2276 | struct msghdr msg_sys; | |
2277 | struct timespec64 end_time; | |
2278 | struct timespec64 timeout64; | |
2279 | ||
2280 | if (timeout && | |
2281 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2282 | timeout->tv_nsec)) | |
2283 | return -EINVAL; | |
2284 | ||
2285 | datagrams = 0; | |
2286 | ||
2287 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2288 | if (!sock) | |
2289 | return err; | |
2290 | ||
2291 | err = sock_error(sock->sk); | |
2292 | if (err) { | |
2293 | datagrams = err; | |
2294 | goto out_put; | |
2295 | } | |
2296 | ||
2297 | entry = mmsg; | |
2298 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
2299 | ||
2300 | while (datagrams < vlen) { | |
2301 | /* | |
2302 | * No need to ask LSM for more than the first datagram. | |
2303 | */ | |
2304 | if (MSG_CMSG_COMPAT & flags) { | |
2305 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, | |
2306 | &msg_sys, flags & ~MSG_WAITFORONE, | |
2307 | datagrams); | |
2308 | if (err < 0) | |
2309 | break; | |
2310 | err = __put_user(err, &compat_entry->msg_len); | |
2311 | ++compat_entry; | |
2312 | } else { | |
2313 | err = ___sys_recvmsg(sock, | |
2314 | (struct user_msghdr __user *)entry, | |
2315 | &msg_sys, flags & ~MSG_WAITFORONE, | |
2316 | datagrams); | |
2317 | if (err < 0) | |
2318 | break; | |
2319 | err = put_user(err, &entry->msg_len); | |
2320 | ++entry; | |
2321 | } | |
2322 | ||
2323 | if (err) | |
2324 | break; | |
2325 | ++datagrams; | |
2326 | ||
2327 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ | |
2328 | if (flags & MSG_WAITFORONE) | |
2329 | flags |= MSG_DONTWAIT; | |
2330 | ||
2331 | if (timeout) { | |
2332 | ktime_get_ts64(&timeout64); | |
2333 | *timeout = timespec64_to_timespec( | |
2334 | timespec64_sub(end_time, timeout64)); | |
2335 | if (timeout->tv_sec < 0) { | |
2336 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2337 | break; | |
2338 | } | |
2339 | ||
2340 | /* Timeout, return less than vlen datagrams */ | |
2341 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2342 | break; | |
2343 | } | |
2344 | ||
2345 | /* Out of band data, return right away */ | |
2346 | if (msg_sys.msg_flags & MSG_OOB) | |
2347 | break; | |
2348 | cond_resched(); | |
2349 | } | |
2350 | ||
2351 | if (err == 0) | |
2352 | goto out_put; | |
2353 | ||
2354 | if (datagrams == 0) { | |
2355 | datagrams = err; | |
2356 | goto out_put; | |
2357 | } | |
2358 | ||
2359 | /* | |
2360 | * We may return less entries than requested (vlen) if the | |
2361 | * sock is non block and there aren't enough datagrams... | |
2362 | */ | |
2363 | if (err != -EAGAIN) { | |
2364 | /* | |
2365 | * ... or if recvmsg returns an error after we | |
2366 | * received some datagrams, where we record the | |
2367 | * error to return on the next call or if the | |
2368 | * app asks about it using getsockopt(SO_ERROR). | |
2369 | */ | |
2370 | sock->sk->sk_err = -err; | |
2371 | } | |
2372 | out_put: | |
2373 | fput_light(sock->file, fput_needed); | |
2374 | ||
2375 | return datagrams; | |
2376 | } | |
2377 | ||
2378 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2379 | unsigned int, vlen, unsigned int, flags, | |
2380 | struct timespec __user *, timeout) | |
2381 | { | |
2382 | int datagrams; | |
2383 | struct timespec timeout_sys; | |
2384 | ||
2385 | if (flags & MSG_CMSG_COMPAT) | |
2386 | return -EINVAL; | |
2387 | ||
2388 | if (!timeout) | |
2389 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2390 | ||
2391 | if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) | |
2392 | return -EFAULT; | |
2393 | ||
2394 | datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
2395 | ||
2396 | if (datagrams > 0 && | |
2397 | copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) | |
2398 | datagrams = -EFAULT; | |
2399 | ||
2400 | return datagrams; | |
2401 | } | |
2402 | ||
2403 | #ifdef __ARCH_WANT_SYS_SOCKETCALL | |
2404 | /* Argument list sizes for sys_socketcall */ | |
2405 | #define AL(x) ((x) * sizeof(unsigned long)) | |
2406 | static const unsigned char nargs[21] = { | |
2407 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), | |
2408 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2409 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
2410 | AL(4), AL(5), AL(4) | |
2411 | }; | |
2412 | ||
2413 | #undef AL | |
2414 | ||
2415 | /* | |
2416 | * System call vectors. | |
2417 | * | |
2418 | * Argument checking cleaned up. Saved 20% in size. | |
2419 | * This function doesn't need to set the kernel lock because | |
2420 | * it is set by the callees. | |
2421 | */ | |
2422 | ||
2423 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) | |
2424 | { | |
2425 | unsigned long a[AUDITSC_ARGS]; | |
2426 | unsigned long a0, a1; | |
2427 | int err; | |
2428 | unsigned int len; | |
2429 | ||
2430 | if (call < 1 || call > SYS_SENDMMSG) | |
2431 | return -EINVAL; | |
2432 | ||
2433 | len = nargs[call]; | |
2434 | if (len > sizeof(a)) | |
2435 | return -EINVAL; | |
2436 | ||
2437 | /* copy_from_user should be SMP safe. */ | |
2438 | if (copy_from_user(a, args, len)) | |
2439 | return -EFAULT; | |
2440 | ||
2441 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); | |
2442 | if (err) | |
2443 | return err; | |
2444 | ||
2445 | a0 = a[0]; | |
2446 | a1 = a[1]; | |
2447 | ||
2448 | switch (call) { | |
2449 | case SYS_SOCKET: | |
2450 | err = sys_socket(a0, a1, a[2]); | |
2451 | break; | |
2452 | case SYS_BIND: | |
2453 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); | |
2454 | break; | |
2455 | case SYS_CONNECT: | |
2456 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); | |
2457 | break; | |
2458 | case SYS_LISTEN: | |
2459 | err = sys_listen(a0, a1); | |
2460 | break; | |
2461 | case SYS_ACCEPT: | |
2462 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2463 | (int __user *)a[2], 0); | |
2464 | break; | |
2465 | case SYS_GETSOCKNAME: | |
2466 | err = | |
2467 | sys_getsockname(a0, (struct sockaddr __user *)a1, | |
2468 | (int __user *)a[2]); | |
2469 | break; | |
2470 | case SYS_GETPEERNAME: | |
2471 | err = | |
2472 | sys_getpeername(a0, (struct sockaddr __user *)a1, | |
2473 | (int __user *)a[2]); | |
2474 | break; | |
2475 | case SYS_SOCKETPAIR: | |
2476 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); | |
2477 | break; | |
2478 | case SYS_SEND: | |
2479 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); | |
2480 | break; | |
2481 | case SYS_SENDTO: | |
2482 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], | |
2483 | (struct sockaddr __user *)a[4], a[5]); | |
2484 | break; | |
2485 | case SYS_RECV: | |
2486 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); | |
2487 | break; | |
2488 | case SYS_RECVFROM: | |
2489 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], | |
2490 | (struct sockaddr __user *)a[4], | |
2491 | (int __user *)a[5]); | |
2492 | break; | |
2493 | case SYS_SHUTDOWN: | |
2494 | err = sys_shutdown(a0, a1); | |
2495 | break; | |
2496 | case SYS_SETSOCKOPT: | |
2497 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); | |
2498 | break; | |
2499 | case SYS_GETSOCKOPT: | |
2500 | err = | |
2501 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], | |
2502 | (int __user *)a[4]); | |
2503 | break; | |
2504 | case SYS_SENDMSG: | |
2505 | err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]); | |
2506 | break; | |
2507 | case SYS_SENDMMSG: | |
2508 | err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); | |
2509 | break; | |
2510 | case SYS_RECVMSG: | |
2511 | err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]); | |
2512 | break; | |
2513 | case SYS_RECVMMSG: | |
2514 | err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], | |
2515 | (struct timespec __user *)a[4]); | |
2516 | break; | |
2517 | case SYS_ACCEPT4: | |
2518 | err = sys_accept4(a0, (struct sockaddr __user *)a1, | |
2519 | (int __user *)a[2], a[3]); | |
2520 | break; | |
2521 | default: | |
2522 | err = -EINVAL; | |
2523 | break; | |
2524 | } | |
2525 | return err; | |
2526 | } | |
2527 | ||
2528 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ | |
2529 | ||
2530 | /** | |
2531 | * sock_register - add a socket protocol handler | |
2532 | * @ops: description of protocol | |
2533 | * | |
2534 | * This function is called by a protocol handler that wants to | |
2535 | * advertise its address family, and have it linked into the | |
2536 | * socket interface. The value ops->family corresponds to the | |
2537 | * socket system call protocol family. | |
2538 | */ | |
2539 | int sock_register(const struct net_proto_family *ops) | |
2540 | { | |
2541 | int err; | |
2542 | ||
2543 | if (ops->family >= NPROTO) { | |
2544 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); | |
2545 | return -ENOBUFS; | |
2546 | } | |
2547 | ||
2548 | spin_lock(&net_family_lock); | |
2549 | if (rcu_dereference_protected(net_families[ops->family], | |
2550 | lockdep_is_held(&net_family_lock))) | |
2551 | err = -EEXIST; | |
2552 | else { | |
2553 | rcu_assign_pointer(net_families[ops->family], ops); | |
2554 | err = 0; | |
2555 | } | |
2556 | spin_unlock(&net_family_lock); | |
2557 | ||
2558 | pr_info("NET: Registered protocol family %d\n", ops->family); | |
2559 | return err; | |
2560 | } | |
2561 | EXPORT_SYMBOL(sock_register); | |
2562 | ||
2563 | /** | |
2564 | * sock_unregister - remove a protocol handler | |
2565 | * @family: protocol family to remove | |
2566 | * | |
2567 | * This function is called by a protocol handler that wants to | |
2568 | * remove its address family, and have it unlinked from the | |
2569 | * new socket creation. | |
2570 | * | |
2571 | * If protocol handler is a module, then it can use module reference | |
2572 | * counts to protect against new references. If protocol handler is not | |
2573 | * a module then it needs to provide its own protection in | |
2574 | * the ops->create routine. | |
2575 | */ | |
2576 | void sock_unregister(int family) | |
2577 | { | |
2578 | BUG_ON(family < 0 || family >= NPROTO); | |
2579 | ||
2580 | spin_lock(&net_family_lock); | |
2581 | RCU_INIT_POINTER(net_families[family], NULL); | |
2582 | spin_unlock(&net_family_lock); | |
2583 | ||
2584 | synchronize_rcu(); | |
2585 | ||
2586 | pr_info("NET: Unregistered protocol family %d\n", family); | |
2587 | } | |
2588 | EXPORT_SYMBOL(sock_unregister); | |
2589 | ||
2590 | static int __init sock_init(void) | |
2591 | { | |
2592 | int err; | |
2593 | /* | |
2594 | * Initialize the network sysctl infrastructure. | |
2595 | */ | |
2596 | err = net_sysctl_init(); | |
2597 | if (err) | |
2598 | goto out; | |
2599 | ||
2600 | /* | |
2601 | * Initialize skbuff SLAB cache | |
2602 | */ | |
2603 | skb_init(); | |
2604 | ||
2605 | /* | |
2606 | * Initialize the protocols module. | |
2607 | */ | |
2608 | ||
2609 | init_inodecache(); | |
2610 | ||
2611 | err = register_filesystem(&sock_fs_type); | |
2612 | if (err) | |
2613 | goto out_fs; | |
2614 | sock_mnt = kern_mount(&sock_fs_type); | |
2615 | if (IS_ERR(sock_mnt)) { | |
2616 | err = PTR_ERR(sock_mnt); | |
2617 | goto out_mount; | |
2618 | } | |
2619 | ||
2620 | /* The real protocol initialization is performed in later initcalls. | |
2621 | */ | |
2622 | ||
2623 | #ifdef CONFIG_NETFILTER | |
2624 | err = netfilter_init(); | |
2625 | if (err) | |
2626 | goto out; | |
2627 | #endif | |
2628 | ||
2629 | ptp_classifier_init(); | |
2630 | ||
2631 | out: | |
2632 | return err; | |
2633 | ||
2634 | out_mount: | |
2635 | unregister_filesystem(&sock_fs_type); | |
2636 | out_fs: | |
2637 | goto out; | |
2638 | } | |
2639 | ||
2640 | core_initcall(sock_init); /* early initcall */ | |
2641 | ||
2642 | #ifdef CONFIG_PROC_FS | |
2643 | void socket_seq_show(struct seq_file *seq) | |
2644 | { | |
2645 | seq_printf(seq, "sockets: used %d\n", | |
2646 | sock_inuse_get(seq->private)); | |
2647 | } | |
2648 | #endif /* CONFIG_PROC_FS */ | |
2649 | ||
2650 | #ifdef CONFIG_COMPAT | |
2651 | static int do_siocgstamp(struct net *net, struct socket *sock, | |
2652 | unsigned int cmd, void __user *up) | |
2653 | { | |
2654 | mm_segment_t old_fs = get_fs(); | |
2655 | struct timeval ktv; | |
2656 | int err; | |
2657 | ||
2658 | set_fs(KERNEL_DS); | |
2659 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); | |
2660 | set_fs(old_fs); | |
2661 | if (!err) | |
2662 | err = compat_put_timeval(&ktv, up); | |
2663 | ||
2664 | return err; | |
2665 | } | |
2666 | ||
2667 | static int do_siocgstampns(struct net *net, struct socket *sock, | |
2668 | unsigned int cmd, void __user *up) | |
2669 | { | |
2670 | mm_segment_t old_fs = get_fs(); | |
2671 | struct timespec kts; | |
2672 | int err; | |
2673 | ||
2674 | set_fs(KERNEL_DS); | |
2675 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); | |
2676 | set_fs(old_fs); | |
2677 | if (!err) | |
2678 | err = compat_put_timespec(&kts, up); | |
2679 | ||
2680 | return err; | |
2681 | } | |
2682 | ||
2683 | static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) | |
2684 | { | |
2685 | struct compat_ifconf ifc32; | |
2686 | struct ifconf ifc; | |
2687 | int err; | |
2688 | ||
2689 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) | |
2690 | return -EFAULT; | |
2691 | ||
2692 | ifc.ifc_len = ifc32.ifc_len; | |
2693 | ifc.ifc_req = compat_ptr(ifc32.ifcbuf); | |
2694 | ||
2695 | rtnl_lock(); | |
2696 | err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); | |
2697 | rtnl_unlock(); | |
2698 | if (err) | |
2699 | return err; | |
2700 | ||
2701 | ifc32.ifc_len = ifc.ifc_len; | |
2702 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) | |
2703 | return -EFAULT; | |
2704 | ||
2705 | return 0; | |
2706 | } | |
2707 | ||
2708 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) | |
2709 | { | |
2710 | struct compat_ethtool_rxnfc __user *compat_rxnfc; | |
2711 | bool convert_in = false, convert_out = false; | |
2712 | size_t buf_size = 0; | |
2713 | struct ethtool_rxnfc __user *rxnfc = NULL; | |
2714 | struct ifreq ifr; | |
2715 | u32 rule_cnt = 0, actual_rule_cnt; | |
2716 | u32 ethcmd; | |
2717 | u32 data; | |
2718 | int ret; | |
2719 | ||
2720 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) | |
2721 | return -EFAULT; | |
2722 | ||
2723 | compat_rxnfc = compat_ptr(data); | |
2724 | ||
2725 | if (get_user(ethcmd, &compat_rxnfc->cmd)) | |
2726 | return -EFAULT; | |
2727 | ||
2728 | /* Most ethtool structures are defined without padding. | |
2729 | * Unfortunately struct ethtool_rxnfc is an exception. | |
2730 | */ | |
2731 | switch (ethcmd) { | |
2732 | default: | |
2733 | break; | |
2734 | case ETHTOOL_GRXCLSRLALL: | |
2735 | /* Buffer size is variable */ | |
2736 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) | |
2737 | return -EFAULT; | |
2738 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) | |
2739 | return -ENOMEM; | |
2740 | buf_size += rule_cnt * sizeof(u32); | |
2741 | /* fall through */ | |
2742 | case ETHTOOL_GRXRINGS: | |
2743 | case ETHTOOL_GRXCLSRLCNT: | |
2744 | case ETHTOOL_GRXCLSRULE: | |
2745 | case ETHTOOL_SRXCLSRLINS: | |
2746 | convert_out = true; | |
2747 | /* fall through */ | |
2748 | case ETHTOOL_SRXCLSRLDEL: | |
2749 | buf_size += sizeof(struct ethtool_rxnfc); | |
2750 | convert_in = true; | |
2751 | rxnfc = compat_alloc_user_space(buf_size); | |
2752 | break; | |
2753 | } | |
2754 | ||
2755 | if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) | |
2756 | return -EFAULT; | |
2757 | ||
2758 | ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; | |
2759 | ||
2760 | if (convert_in) { | |
2761 | /* We expect there to be holes between fs.m_ext and | |
2762 | * fs.ring_cookie and at the end of fs, but nowhere else. | |
2763 | */ | |
2764 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + | |
2765 | sizeof(compat_rxnfc->fs.m_ext) != | |
2766 | offsetof(struct ethtool_rxnfc, fs.m_ext) + | |
2767 | sizeof(rxnfc->fs.m_ext)); | |
2768 | BUILD_BUG_ON( | |
2769 | offsetof(struct compat_ethtool_rxnfc, fs.location) - | |
2770 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != | |
2771 | offsetof(struct ethtool_rxnfc, fs.location) - | |
2772 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); | |
2773 | ||
2774 | if (copy_in_user(rxnfc, compat_rxnfc, | |
2775 | (void __user *)(&rxnfc->fs.m_ext + 1) - | |
2776 | (void __user *)rxnfc) || | |
2777 | copy_in_user(&rxnfc->fs.ring_cookie, | |
2778 | &compat_rxnfc->fs.ring_cookie, | |
2779 | (void __user *)(&rxnfc->fs.location + 1) - | |
2780 | (void __user *)&rxnfc->fs.ring_cookie) || | |
2781 | copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, | |
2782 | sizeof(rxnfc->rule_cnt))) | |
2783 | return -EFAULT; | |
2784 | } | |
2785 | ||
2786 | ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); | |
2787 | if (ret) | |
2788 | return ret; | |
2789 | ||
2790 | if (convert_out) { | |
2791 | if (copy_in_user(compat_rxnfc, rxnfc, | |
2792 | (const void __user *)(&rxnfc->fs.m_ext + 1) - | |
2793 | (const void __user *)rxnfc) || | |
2794 | copy_in_user(&compat_rxnfc->fs.ring_cookie, | |
2795 | &rxnfc->fs.ring_cookie, | |
2796 | (const void __user *)(&rxnfc->fs.location + 1) - | |
2797 | (const void __user *)&rxnfc->fs.ring_cookie) || | |
2798 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, | |
2799 | sizeof(rxnfc->rule_cnt))) | |
2800 | return -EFAULT; | |
2801 | ||
2802 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
2803 | /* As an optimisation, we only copy the actual | |
2804 | * number of rules that the underlying | |
2805 | * function returned. Since Mallory might | |
2806 | * change the rule count in user memory, we | |
2807 | * check that it is less than the rule count | |
2808 | * originally given (as the user buffer size), | |
2809 | * which has been range-checked. | |
2810 | */ | |
2811 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) | |
2812 | return -EFAULT; | |
2813 | if (actual_rule_cnt < rule_cnt) | |
2814 | rule_cnt = actual_rule_cnt; | |
2815 | if (copy_in_user(&compat_rxnfc->rule_locs[0], | |
2816 | &rxnfc->rule_locs[0], | |
2817 | rule_cnt * sizeof(u32))) | |
2818 | return -EFAULT; | |
2819 | } | |
2820 | } | |
2821 | ||
2822 | return 0; | |
2823 | } | |
2824 | ||
2825 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) | |
2826 | { | |
2827 | compat_uptr_t uptr32; | |
2828 | struct ifreq ifr; | |
2829 | void __user *saved; | |
2830 | int err; | |
2831 | ||
2832 | if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) | |
2833 | return -EFAULT; | |
2834 | ||
2835 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
2836 | return -EFAULT; | |
2837 | ||
2838 | saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; | |
2839 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); | |
2840 | ||
2841 | err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); | |
2842 | if (!err) { | |
2843 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; | |
2844 | if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) | |
2845 | err = -EFAULT; | |
2846 | } | |
2847 | return err; | |
2848 | } | |
2849 | ||
2850 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ | |
2851 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
2852 | struct compat_ifreq __user *u_ifreq32) | |
2853 | { | |
2854 | struct ifreq ifreq; | |
2855 | u32 data32; | |
2856 | ||
2857 | if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) | |
2858 | return -EFAULT; | |
2859 | if (get_user(data32, &u_ifreq32->ifr_data)) | |
2860 | return -EFAULT; | |
2861 | ifreq.ifr_data = compat_ptr(data32); | |
2862 | ||
2863 | return dev_ioctl(net, cmd, &ifreq, NULL); | |
2864 | } | |
2865 | ||
2866 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, | |
2867 | struct compat_ifreq __user *uifr32) | |
2868 | { | |
2869 | struct ifreq ifr; | |
2870 | struct compat_ifmap __user *uifmap32; | |
2871 | int err; | |
2872 | ||
2873 | uifmap32 = &uifr32->ifr_ifru.ifru_map; | |
2874 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); | |
2875 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); | |
2876 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
2877 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
2878 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); | |
2879 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); | |
2880 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); | |
2881 | if (err) | |
2882 | return -EFAULT; | |
2883 | ||
2884 | err = dev_ioctl(net, cmd, &ifr, NULL); | |
2885 | ||
2886 | if (cmd == SIOCGIFMAP && !err) { | |
2887 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); | |
2888 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); | |
2889 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
2890 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
2891 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); | |
2892 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); | |
2893 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); | |
2894 | if (err) | |
2895 | err = -EFAULT; | |
2896 | } | |
2897 | return err; | |
2898 | } | |
2899 | ||
2900 | struct rtentry32 { | |
2901 | u32 rt_pad1; | |
2902 | struct sockaddr rt_dst; /* target address */ | |
2903 | struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ | |
2904 | struct sockaddr rt_genmask; /* target network mask (IP) */ | |
2905 | unsigned short rt_flags; | |
2906 | short rt_pad2; | |
2907 | u32 rt_pad3; | |
2908 | unsigned char rt_tos; | |
2909 | unsigned char rt_class; | |
2910 | short rt_pad4; | |
2911 | short rt_metric; /* +1 for binary compatibility! */ | |
2912 | /* char * */ u32 rt_dev; /* forcing the device at add */ | |
2913 | u32 rt_mtu; /* per route MTU/Window */ | |
2914 | u32 rt_window; /* Window clamping */ | |
2915 | unsigned short rt_irtt; /* Initial RTT */ | |
2916 | }; | |
2917 | ||
2918 | struct in6_rtmsg32 { | |
2919 | struct in6_addr rtmsg_dst; | |
2920 | struct in6_addr rtmsg_src; | |
2921 | struct in6_addr rtmsg_gateway; | |
2922 | u32 rtmsg_type; | |
2923 | u16 rtmsg_dst_len; | |
2924 | u16 rtmsg_src_len; | |
2925 | u32 rtmsg_metric; | |
2926 | u32 rtmsg_info; | |
2927 | u32 rtmsg_flags; | |
2928 | s32 rtmsg_ifindex; | |
2929 | }; | |
2930 | ||
2931 | static int routing_ioctl(struct net *net, struct socket *sock, | |
2932 | unsigned int cmd, void __user *argp) | |
2933 | { | |
2934 | int ret; | |
2935 | void *r = NULL; | |
2936 | struct in6_rtmsg r6; | |
2937 | struct rtentry r4; | |
2938 | char devname[16]; | |
2939 | u32 rtdev; | |
2940 | mm_segment_t old_fs = get_fs(); | |
2941 | ||
2942 | if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ | |
2943 | struct in6_rtmsg32 __user *ur6 = argp; | |
2944 | ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), | |
2945 | 3 * sizeof(struct in6_addr)); | |
2946 | ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); | |
2947 | ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); | |
2948 | ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); | |
2949 | ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); | |
2950 | ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); | |
2951 | ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); | |
2952 | ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); | |
2953 | ||
2954 | r = (void *) &r6; | |
2955 | } else { /* ipv4 */ | |
2956 | struct rtentry32 __user *ur4 = argp; | |
2957 | ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), | |
2958 | 3 * sizeof(struct sockaddr)); | |
2959 | ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); | |
2960 | ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); | |
2961 | ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); | |
2962 | ret |= get_user(r4.rt_window, &(ur4->rt_window)); | |
2963 | ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); | |
2964 | ret |= get_user(rtdev, &(ur4->rt_dev)); | |
2965 | if (rtdev) { | |
2966 | ret |= copy_from_user(devname, compat_ptr(rtdev), 15); | |
2967 | r4.rt_dev = (char __user __force *)devname; | |
2968 | devname[15] = 0; | |
2969 | } else | |
2970 | r4.rt_dev = NULL; | |
2971 | ||
2972 | r = (void *) &r4; | |
2973 | } | |
2974 | ||
2975 | if (ret) { | |
2976 | ret = -EFAULT; | |
2977 | goto out; | |
2978 | } | |
2979 | ||
2980 | set_fs(KERNEL_DS); | |
2981 | ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); | |
2982 | set_fs(old_fs); | |
2983 | ||
2984 | out: | |
2985 | return ret; | |
2986 | } | |
2987 | ||
2988 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE | |
2989 | * for some operations; this forces use of the newer bridge-utils that | |
2990 | * use compatible ioctls | |
2991 | */ | |
2992 | static int old_bridge_ioctl(compat_ulong_t __user *argp) | |
2993 | { | |
2994 | compat_ulong_t tmp; | |
2995 | ||
2996 | if (get_user(tmp, argp)) | |
2997 | return -EFAULT; | |
2998 | if (tmp == BRCTL_GET_VERSION) | |
2999 | return BRCTL_VERSION + 1; | |
3000 | return -EINVAL; | |
3001 | } | |
3002 | ||
3003 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, | |
3004 | unsigned int cmd, unsigned long arg) | |
3005 | { | |
3006 | void __user *argp = compat_ptr(arg); | |
3007 | struct sock *sk = sock->sk; | |
3008 | struct net *net = sock_net(sk); | |
3009 | ||
3010 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) | |
3011 | return compat_ifr_data_ioctl(net, cmd, argp); | |
3012 | ||
3013 | switch (cmd) { | |
3014 | case SIOCSIFBR: | |
3015 | case SIOCGIFBR: | |
3016 | return old_bridge_ioctl(argp); | |
3017 | case SIOCGIFCONF: | |
3018 | return compat_dev_ifconf(net, argp); | |
3019 | case SIOCETHTOOL: | |
3020 | return ethtool_ioctl(net, argp); | |
3021 | case SIOCWANDEV: | |
3022 | return compat_siocwandev(net, argp); | |
3023 | case SIOCGIFMAP: | |
3024 | case SIOCSIFMAP: | |
3025 | return compat_sioc_ifmap(net, cmd, argp); | |
3026 | case SIOCADDRT: | |
3027 | case SIOCDELRT: | |
3028 | return routing_ioctl(net, sock, cmd, argp); | |
3029 | case SIOCGSTAMP: | |
3030 | return do_siocgstamp(net, sock, cmd, argp); | |
3031 | case SIOCGSTAMPNS: | |
3032 | return do_siocgstampns(net, sock, cmd, argp); | |
3033 | case SIOCBONDSLAVEINFOQUERY: | |
3034 | case SIOCBONDINFOQUERY: | |
3035 | case SIOCSHWTSTAMP: | |
3036 | case SIOCGHWTSTAMP: | |
3037 | return compat_ifr_data_ioctl(net, cmd, argp); | |
3038 | ||
3039 | case FIOSETOWN: | |
3040 | case SIOCSPGRP: | |
3041 | case FIOGETOWN: | |
3042 | case SIOCGPGRP: | |
3043 | case SIOCBRADDBR: | |
3044 | case SIOCBRDELBR: | |
3045 | case SIOCGIFVLAN: | |
3046 | case SIOCSIFVLAN: | |
3047 | case SIOCADDDLCI: | |
3048 | case SIOCDELDLCI: | |
3049 | case SIOCGSKNS: | |
3050 | return sock_ioctl(file, cmd, arg); | |
3051 | ||
3052 | case SIOCGIFFLAGS: | |
3053 | case SIOCSIFFLAGS: | |
3054 | case SIOCGIFMETRIC: | |
3055 | case SIOCSIFMETRIC: | |
3056 | case SIOCGIFMTU: | |
3057 | case SIOCSIFMTU: | |
3058 | case SIOCGIFMEM: | |
3059 | case SIOCSIFMEM: | |
3060 | case SIOCGIFHWADDR: | |
3061 | case SIOCSIFHWADDR: | |
3062 | case SIOCADDMULTI: | |
3063 | case SIOCDELMULTI: | |
3064 | case SIOCGIFINDEX: | |
3065 | case SIOCGIFADDR: | |
3066 | case SIOCSIFADDR: | |
3067 | case SIOCSIFHWBROADCAST: | |
3068 | case SIOCDIFADDR: | |
3069 | case SIOCGIFBRDADDR: | |
3070 | case SIOCSIFBRDADDR: | |
3071 | case SIOCGIFDSTADDR: | |
3072 | case SIOCSIFDSTADDR: | |
3073 | case SIOCGIFNETMASK: | |
3074 | case SIOCSIFNETMASK: | |
3075 | case SIOCSIFPFLAGS: | |
3076 | case SIOCGIFPFLAGS: | |
3077 | case SIOCGIFTXQLEN: | |
3078 | case SIOCSIFTXQLEN: | |
3079 | case SIOCBRADDIF: | |
3080 | case SIOCBRDELIF: | |
3081 | case SIOCSIFNAME: | |
3082 | case SIOCGMIIPHY: | |
3083 | case SIOCGMIIREG: | |
3084 | case SIOCSMIIREG: | |
3085 | case SIOCSARP: | |
3086 | case SIOCGARP: | |
3087 | case SIOCDARP: | |
3088 | case SIOCATMARK: | |
3089 | case SIOCBONDENSLAVE: | |
3090 | case SIOCBONDRELEASE: | |
3091 | case SIOCBONDSETHWADDR: | |
3092 | case SIOCBONDCHANGEACTIVE: | |
3093 | case SIOCGIFNAME: | |
3094 | return sock_do_ioctl(net, sock, cmd, arg); | |
3095 | } | |
3096 | ||
3097 | return -ENOIOCTLCMD; | |
3098 | } | |
3099 | ||
3100 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, | |
3101 | unsigned long arg) | |
3102 | { | |
3103 | struct socket *sock = file->private_data; | |
3104 | int ret = -ENOIOCTLCMD; | |
3105 | struct sock *sk; | |
3106 | struct net *net; | |
3107 | ||
3108 | sk = sock->sk; | |
3109 | net = sock_net(sk); | |
3110 | ||
3111 | if (sock->ops->compat_ioctl) | |
3112 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3113 | ||
3114 | if (ret == -ENOIOCTLCMD && | |
3115 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3116 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3117 | ||
3118 | if (ret == -ENOIOCTLCMD) | |
3119 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3120 | ||
3121 | return ret; | |
3122 | } | |
3123 | #endif | |
3124 | ||
3125 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) | |
3126 | { | |
3127 | return sock->ops->bind(sock, addr, addrlen); | |
3128 | } | |
3129 | EXPORT_SYMBOL(kernel_bind); | |
3130 | ||
3131 | int kernel_listen(struct socket *sock, int backlog) | |
3132 | { | |
3133 | return sock->ops->listen(sock, backlog); | |
3134 | } | |
3135 | EXPORT_SYMBOL(kernel_listen); | |
3136 | ||
3137 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) | |
3138 | { | |
3139 | struct sock *sk = sock->sk; | |
3140 | int err; | |
3141 | ||
3142 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3143 | newsock); | |
3144 | if (err < 0) | |
3145 | goto done; | |
3146 | ||
3147 | err = sock->ops->accept(sock, *newsock, flags, true); | |
3148 | if (err < 0) { | |
3149 | sock_release(*newsock); | |
3150 | *newsock = NULL; | |
3151 | goto done; | |
3152 | } | |
3153 | ||
3154 | (*newsock)->ops = sock->ops; | |
3155 | __module_get((*newsock)->ops->owner); | |
3156 | ||
3157 | done: | |
3158 | return err; | |
3159 | } | |
3160 | EXPORT_SYMBOL(kernel_accept); | |
3161 | ||
3162 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, | |
3163 | int flags) | |
3164 | { | |
3165 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3166 | } | |
3167 | EXPORT_SYMBOL(kernel_connect); | |
3168 | ||
3169 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, | |
3170 | int *addrlen) | |
3171 | { | |
3172 | return sock->ops->getname(sock, addr, addrlen, 0); | |
3173 | } | |
3174 | EXPORT_SYMBOL(kernel_getsockname); | |
3175 | ||
3176 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, | |
3177 | int *addrlen) | |
3178 | { | |
3179 | return sock->ops->getname(sock, addr, addrlen, 1); | |
3180 | } | |
3181 | EXPORT_SYMBOL(kernel_getpeername); | |
3182 | ||
3183 | int kernel_getsockopt(struct socket *sock, int level, int optname, | |
3184 | char *optval, int *optlen) | |
3185 | { | |
3186 | mm_segment_t oldfs = get_fs(); | |
3187 | char __user *uoptval; | |
3188 | int __user *uoptlen; | |
3189 | int err; | |
3190 | ||
3191 | uoptval = (char __user __force *) optval; | |
3192 | uoptlen = (int __user __force *) optlen; | |
3193 | ||
3194 | set_fs(KERNEL_DS); | |
3195 | if (level == SOL_SOCKET) | |
3196 | err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); | |
3197 | else | |
3198 | err = sock->ops->getsockopt(sock, level, optname, uoptval, | |
3199 | uoptlen); | |
3200 | set_fs(oldfs); | |
3201 | return err; | |
3202 | } | |
3203 | EXPORT_SYMBOL(kernel_getsockopt); | |
3204 | ||
3205 | int kernel_setsockopt(struct socket *sock, int level, int optname, | |
3206 | char *optval, unsigned int optlen) | |
3207 | { | |
3208 | mm_segment_t oldfs = get_fs(); | |
3209 | char __user *uoptval; | |
3210 | int err; | |
3211 | ||
3212 | uoptval = (char __user __force *) optval; | |
3213 | ||
3214 | set_fs(KERNEL_DS); | |
3215 | if (level == SOL_SOCKET) | |
3216 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); | |
3217 | else | |
3218 | err = sock->ops->setsockopt(sock, level, optname, uoptval, | |
3219 | optlen); | |
3220 | set_fs(oldfs); | |
3221 | return err; | |
3222 | } | |
3223 | EXPORT_SYMBOL(kernel_setsockopt); | |
3224 | ||
3225 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, | |
3226 | size_t size, int flags) | |
3227 | { | |
3228 | if (sock->ops->sendpage) | |
3229 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
3230 | ||
3231 | return sock_no_sendpage(sock, page, offset, size, flags); | |
3232 | } | |
3233 | EXPORT_SYMBOL(kernel_sendpage); | |
3234 | ||
3235 | int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, | |
3236 | size_t size, int flags) | |
3237 | { | |
3238 | struct socket *sock = sk->sk_socket; | |
3239 | ||
3240 | if (sock->ops->sendpage_locked) | |
3241 | return sock->ops->sendpage_locked(sk, page, offset, size, | |
3242 | flags); | |
3243 | ||
3244 | return sock_no_sendpage_locked(sk, page, offset, size, flags); | |
3245 | } | |
3246 | EXPORT_SYMBOL(kernel_sendpage_locked); | |
3247 | ||
3248 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) | |
3249 | { | |
3250 | return sock->ops->shutdown(sock, how); | |
3251 | } | |
3252 | EXPORT_SYMBOL(kernel_sock_shutdown); | |
3253 | ||
3254 | /* This routine returns the IP overhead imposed by a socket i.e. | |
3255 | * the length of the underlying IP header, depending on whether | |
3256 | * this is an IPv4 or IPv6 socket and the length from IP options turned | |
3257 | * on at the socket. Assumes that the caller has a lock on the socket. | |
3258 | */ | |
3259 | u32 kernel_sock_ip_overhead(struct sock *sk) | |
3260 | { | |
3261 | struct inet_sock *inet; | |
3262 | struct ip_options_rcu *opt; | |
3263 | u32 overhead = 0; | |
3264 | #if IS_ENABLED(CONFIG_IPV6) | |
3265 | struct ipv6_pinfo *np; | |
3266 | struct ipv6_txoptions *optv6 = NULL; | |
3267 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3268 | ||
3269 | if (!sk) | |
3270 | return overhead; | |
3271 | ||
3272 | switch (sk->sk_family) { | |
3273 | case AF_INET: | |
3274 | inet = inet_sk(sk); | |
3275 | overhead += sizeof(struct iphdr); | |
3276 | opt = rcu_dereference_protected(inet->inet_opt, | |
3277 | sock_owned_by_user(sk)); | |
3278 | if (opt) | |
3279 | overhead += opt->opt.optlen; | |
3280 | return overhead; | |
3281 | #if IS_ENABLED(CONFIG_IPV6) | |
3282 | case AF_INET6: | |
3283 | np = inet6_sk(sk); | |
3284 | overhead += sizeof(struct ipv6hdr); | |
3285 | if (np) | |
3286 | optv6 = rcu_dereference_protected(np->opt, | |
3287 | sock_owned_by_user(sk)); | |
3288 | if (optv6) | |
3289 | overhead += (optv6->opt_flen + optv6->opt_nflen); | |
3290 | return overhead; | |
3291 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3292 | default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ | |
3293 | return overhead; | |
3294 | } | |
3295 | } | |
3296 | EXPORT_SYMBOL(kernel_sock_ip_overhead); |