Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
02c30a84 | 7 | * Ross Biro |
1da177e4 LT |
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) | |
89bddce5 | 45 | * Tigran Aivazian : Made listen(2) backlog sanity checks |
1da177e4 LT |
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 | |
89bddce5 | 56 | * paradigm. |
1da177e4 LT |
57 | * |
58 | * Based upon Swansea University Computer Society NET3.039 | |
59 | */ | |
60 | ||
1da177e4 | 61 | #include <linux/mm.h> |
1da177e4 LT |
62 | #include <linux/socket.h> |
63 | #include <linux/file.h> | |
64 | #include <linux/net.h> | |
65 | #include <linux/interrupt.h> | |
aaca0bdc | 66 | #include <linux/thread_info.h> |
55737fda | 67 | #include <linux/rcupdate.h> |
1da177e4 LT |
68 | #include <linux/netdevice.h> |
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
4a3e2f71 | 71 | #include <linux/mutex.h> |
1da177e4 | 72 | #include <linux/if_bridge.h> |
20380731 ACM |
73 | #include <linux/if_frad.h> |
74 | #include <linux/if_vlan.h> | |
408eccce | 75 | #include <linux/ptp_classify.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
3ec3b2fb | 86 | #include <linux/audit.h> |
d86b5e0e | 87 | #include <linux/wireless.h> |
1b8d7ae4 | 88 | #include <linux/nsproxy.h> |
1fd7317d | 89 | #include <linux/magic.h> |
5a0e3ad6 | 90 | #include <linux/slab.h> |
600e1779 | 91 | #include <linux/xattr.h> |
c8e8cd57 | 92 | #include <linux/nospec.h> |
1da177e4 | 93 | |
7c0f6ba6 | 94 | #include <linux/uaccess.h> |
1da177e4 LT |
95 | #include <asm/unistd.h> |
96 | ||
97 | #include <net/compat.h> | |
87de87d5 | 98 | #include <net/wext.h> |
f8451725 | 99 | #include <net/cls_cgroup.h> |
1da177e4 LT |
100 | |
101 | #include <net/sock.h> | |
102 | #include <linux/netfilter.h> | |
103 | ||
6b96018b AB |
104 | #include <linux/if_tun.h> |
105 | #include <linux/ipv6_route.h> | |
106 | #include <linux/route.h> | |
6b96018b | 107 | #include <linux/sockios.h> |
076bb0c8 | 108 | #include <net/busy_poll.h> |
f24b9be5 | 109 | #include <linux/errqueue.h> |
06021292 | 110 | |
e0d1095a | 111 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 ET |
112 | unsigned int sysctl_net_busy_read __read_mostly; |
113 | unsigned int sysctl_net_busy_poll __read_mostly; | |
06021292 | 114 | #endif |
6b96018b | 115 | |
8ae5e030 AV |
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); | |
89bddce5 | 118 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
1da177e4 LT |
119 | |
120 | static int sock_close(struct inode *inode, struct file *file); | |
a11e1d43 LT |
121 | static __poll_t sock_poll(struct file *file, |
122 | struct poll_table_struct *wait); | |
89bddce5 | 123 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
89bbfc95 SP |
124 | #ifdef CONFIG_COMPAT |
125 | static long compat_sock_ioctl(struct file *file, | |
89bddce5 | 126 | unsigned int cmd, unsigned long arg); |
89bbfc95 | 127 | #endif |
1da177e4 | 128 | static int sock_fasync(int fd, struct file *filp, int on); |
1da177e4 LT |
129 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
130 | int offset, size_t size, loff_t *ppos, int more); | |
9c55e01c | 131 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 132 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c | 133 | unsigned int flags); |
1da177e4 | 134 | |
1da177e4 LT |
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 | ||
da7071d7 | 140 | static const struct file_operations socket_file_ops = { |
1da177e4 LT |
141 | .owner = THIS_MODULE, |
142 | .llseek = no_llseek, | |
8ae5e030 AV |
143 | .read_iter = sock_read_iter, |
144 | .write_iter = sock_write_iter, | |
1da177e4 LT |
145 | .poll = sock_poll, |
146 | .unlocked_ioctl = sock_ioctl, | |
89bbfc95 SP |
147 | #ifdef CONFIG_COMPAT |
148 | .compat_ioctl = compat_sock_ioctl, | |
149 | #endif | |
1da177e4 | 150 | .mmap = sock_mmap, |
1da177e4 LT |
151 | .release = sock_close, |
152 | .fasync = sock_fasync, | |
5274f052 JA |
153 | .sendpage = sock_sendpage, |
154 | .splice_write = generic_splice_sendpage, | |
9c55e01c | 155 | .splice_read = sock_splice_read, |
1da177e4 LT |
156 | }; |
157 | ||
158 | /* | |
159 | * The protocol list. Each protocol is registered in here. | |
160 | */ | |
161 | ||
1da177e4 | 162 | static DEFINE_SPINLOCK(net_family_lock); |
190683a9 | 163 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; |
1da177e4 | 164 | |
1da177e4 | 165 | /* |
89bddce5 SH |
166 | * Support routines. |
167 | * Move socket addresses back and forth across the kernel/user | |
168 | * divide and look after the messy bits. | |
1da177e4 LT |
169 | */ |
170 | ||
1da177e4 LT |
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 | ||
43db362d | 182 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) |
1da177e4 | 183 | { |
230b1839 | 184 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
1da177e4 | 185 | return -EINVAL; |
89bddce5 | 186 | if (ulen == 0) |
1da177e4 | 187 | return 0; |
89bddce5 | 188 | if (copy_from_user(kaddr, uaddr, ulen)) |
1da177e4 | 189 | return -EFAULT; |
3ec3b2fb | 190 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
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 | */ | |
89bddce5 | 209 | |
43db362d | 210 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, |
11165f14 | 211 | void __user *uaddr, int __user *ulen) |
1da177e4 LT |
212 | { |
213 | int err; | |
214 | int len; | |
215 | ||
68c6beb3 | 216 | BUG_ON(klen > sizeof(struct sockaddr_storage)); |
89bddce5 SH |
217 | err = get_user(len, ulen); |
218 | if (err) | |
1da177e4 | 219 | return err; |
89bddce5 SH |
220 | if (len > klen) |
221 | len = klen; | |
68c6beb3 | 222 | if (len < 0) |
1da177e4 | 223 | return -EINVAL; |
89bddce5 | 224 | if (len) { |
d6fe3945 SG |
225 | if (audit_sockaddr(klen, kaddr)) |
226 | return -ENOMEM; | |
89bddce5 | 227 | if (copy_to_user(uaddr, kaddr, len)) |
1da177e4 LT |
228 | return -EFAULT; |
229 | } | |
230 | /* | |
89bddce5 SH |
231 | * "fromlen shall refer to the value before truncation.." |
232 | * 1003.1g | |
1da177e4 LT |
233 | */ |
234 | return __put_user(klen, ulen); | |
235 | } | |
236 | ||
08009a76 | 237 | static struct kmem_cache *sock_inode_cachep __ro_after_init; |
1da177e4 LT |
238 | |
239 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
240 | { | |
241 | struct socket_alloc *ei; | |
eaefd110 | 242 | struct socket_wq *wq; |
89bddce5 | 243 | |
e94b1766 | 244 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
245 | if (!ei) |
246 | return NULL; | |
eaefd110 ED |
247 | wq = kmalloc(sizeof(*wq), GFP_KERNEL); |
248 | if (!wq) { | |
43815482 ED |
249 | kmem_cache_free(sock_inode_cachep, ei); |
250 | return NULL; | |
251 | } | |
eaefd110 ED |
252 | init_waitqueue_head(&wq->wait); |
253 | wq->fasync_list = NULL; | |
574aab1e | 254 | wq->flags = 0; |
e6476c21 | 255 | ei->socket.wq = wq; |
89bddce5 | 256 | |
1da177e4 LT |
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; | |
1da177e4 LT |
262 | |
263 | return &ei->vfs_inode; | |
264 | } | |
265 | ||
266 | static void sock_destroy_inode(struct inode *inode) | |
267 | { | |
43815482 ED |
268 | struct socket_alloc *ei; |
269 | ||
270 | ei = container_of(inode, struct socket_alloc, vfs_inode); | |
e6476c21 | 271 | kfree_rcu(ei->socket.wq, rcu); |
43815482 | 272 | kmem_cache_free(sock_inode_cachep, ei); |
1da177e4 LT |
273 | } |
274 | ||
51cc5068 | 275 | static void init_once(void *foo) |
1da177e4 | 276 | { |
89bddce5 | 277 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
1da177e4 | 278 | |
a35afb83 | 279 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 280 | } |
89bddce5 | 281 | |
1e911632 | 282 | static void init_inodecache(void) |
1da177e4 LT |
283 | { |
284 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
89bddce5 SH |
285 | sizeof(struct socket_alloc), |
286 | 0, | |
287 | (SLAB_HWCACHE_ALIGN | | |
288 | SLAB_RECLAIM_ACCOUNT | | |
5d097056 | 289 | SLAB_MEM_SPREAD | SLAB_ACCOUNT), |
20c2df83 | 290 | init_once); |
1e911632 | 291 | BUG_ON(sock_inode_cachep == NULL); |
1da177e4 LT |
292 | } |
293 | ||
b87221de | 294 | static const struct super_operations sockfs_ops = { |
c6d409cf ED |
295 | .alloc_inode = sock_alloc_inode, |
296 | .destroy_inode = sock_destroy_inode, | |
297 | .statfs = simple_statfs, | |
1da177e4 LT |
298 | }; |
299 | ||
c23fbb6b ED |
300 | /* |
301 | * sockfs_dname() is called from d_path(). | |
302 | */ | |
303 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
304 | { | |
305 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
c5ef6035 | 306 | d_inode(dentry)->i_ino); |
c23fbb6b ED |
307 | } |
308 | ||
3ba13d17 | 309 | static const struct dentry_operations sockfs_dentry_operations = { |
c23fbb6b | 310 | .d_dname = sockfs_dname, |
1da177e4 LT |
311 | }; |
312 | ||
bba0bd31 AG |
313 | static int sockfs_xattr_get(const struct xattr_handler *handler, |
314 | struct dentry *dentry, struct inode *inode, | |
315 | const char *suffix, void *value, size_t size) | |
316 | { | |
317 | if (value) { | |
318 | if (dentry->d_name.len + 1 > size) | |
319 | return -ERANGE; | |
320 | memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); | |
321 | } | |
322 | return dentry->d_name.len + 1; | |
323 | } | |
324 | ||
325 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
326 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
327 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
328 | ||
329 | static const struct xattr_handler sockfs_xattr_handler = { | |
330 | .name = XATTR_NAME_SOCKPROTONAME, | |
331 | .get = sockfs_xattr_get, | |
332 | }; | |
333 | ||
4a590153 AG |
334 | static int sockfs_security_xattr_set(const struct xattr_handler *handler, |
335 | struct dentry *dentry, struct inode *inode, | |
336 | const char *suffix, const void *value, | |
337 | size_t size, int flags) | |
338 | { | |
339 | /* Handled by LSM. */ | |
340 | return -EAGAIN; | |
341 | } | |
342 | ||
343 | static const struct xattr_handler sockfs_security_xattr_handler = { | |
344 | .prefix = XATTR_SECURITY_PREFIX, | |
345 | .set = sockfs_security_xattr_set, | |
346 | }; | |
347 | ||
bba0bd31 AG |
348 | static const struct xattr_handler *sockfs_xattr_handlers[] = { |
349 | &sockfs_xattr_handler, | |
4a590153 | 350 | &sockfs_security_xattr_handler, |
bba0bd31 AG |
351 | NULL |
352 | }; | |
353 | ||
c74a1cbb AV |
354 | static struct dentry *sockfs_mount(struct file_system_type *fs_type, |
355 | int flags, const char *dev_name, void *data) | |
356 | { | |
bba0bd31 AG |
357 | return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, |
358 | sockfs_xattr_handlers, | |
359 | &sockfs_dentry_operations, SOCKFS_MAGIC); | |
c74a1cbb AV |
360 | } |
361 | ||
362 | static struct vfsmount *sock_mnt __read_mostly; | |
363 | ||
364 | static struct file_system_type sock_fs_type = { | |
365 | .name = "sockfs", | |
366 | .mount = sockfs_mount, | |
367 | .kill_sb = kill_anon_super, | |
368 | }; | |
369 | ||
1da177e4 LT |
370 | /* |
371 | * Obtains the first available file descriptor and sets it up for use. | |
372 | * | |
39d8c1b6 DM |
373 | * These functions create file structures and maps them to fd space |
374 | * of the current process. On success it returns file descriptor | |
1da177e4 LT |
375 | * and file struct implicitly stored in sock->file. |
376 | * Note that another thread may close file descriptor before we return | |
377 | * from this function. We use the fact that now we do not refer | |
378 | * to socket after mapping. If one day we will need it, this | |
379 | * function will increment ref. count on file by 1. | |
380 | * | |
381 | * In any case returned fd MAY BE not valid! | |
382 | * This race condition is unavoidable | |
383 | * with shared fd spaces, we cannot solve it inside kernel, | |
384 | * but we take care of internal coherence yet. | |
385 | */ | |
386 | ||
8a3c245c PT |
387 | /** |
388 | * sock_alloc_file - Bind a &socket to a &file | |
389 | * @sock: socket | |
390 | * @flags: file status flags | |
391 | * @dname: protocol name | |
392 | * | |
393 | * Returns the &file bound with @sock, implicitly storing it | |
394 | * in sock->file. If dname is %NULL, sets to "". | |
395 | * On failure the return is a ERR pointer (see linux/err.h). | |
396 | * This function uses GFP_KERNEL internally. | |
397 | */ | |
398 | ||
aab174f0 | 399 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) |
1da177e4 | 400 | { |
7cbe66b6 | 401 | struct file *file; |
1da177e4 | 402 | |
d93aa9d8 AV |
403 | if (!dname) |
404 | dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; | |
39d8c1b6 | 405 | |
d93aa9d8 AV |
406 | file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, |
407 | O_RDWR | (flags & O_NONBLOCK), | |
408 | &socket_file_ops); | |
b5ffe634 | 409 | if (IS_ERR(file)) { |
8e1611e2 | 410 | sock_release(sock); |
39b65252 | 411 | return file; |
cc3808f8 AV |
412 | } |
413 | ||
414 | sock->file = file; | |
39d8c1b6 | 415 | file->private_data = sock; |
28407630 | 416 | return file; |
39d8c1b6 | 417 | } |
56b31d1c | 418 | EXPORT_SYMBOL(sock_alloc_file); |
39d8c1b6 | 419 | |
56b31d1c | 420 | static int sock_map_fd(struct socket *sock, int flags) |
39d8c1b6 DM |
421 | { |
422 | struct file *newfile; | |
28407630 | 423 | int fd = get_unused_fd_flags(flags); |
ce4bb04c AV |
424 | if (unlikely(fd < 0)) { |
425 | sock_release(sock); | |
28407630 | 426 | return fd; |
ce4bb04c | 427 | } |
39d8c1b6 | 428 | |
aab174f0 | 429 | newfile = sock_alloc_file(sock, flags, NULL); |
28407630 | 430 | if (likely(!IS_ERR(newfile))) { |
39d8c1b6 | 431 | fd_install(fd, newfile); |
28407630 AV |
432 | return fd; |
433 | } | |
7cbe66b6 | 434 | |
28407630 AV |
435 | put_unused_fd(fd); |
436 | return PTR_ERR(newfile); | |
1da177e4 LT |
437 | } |
438 | ||
8a3c245c PT |
439 | /** |
440 | * sock_from_file - Return the &socket bounded to @file. | |
441 | * @file: file | |
442 | * @err: pointer to an error code return | |
443 | * | |
444 | * On failure returns %NULL and assigns -ENOTSOCK to @err. | |
445 | */ | |
446 | ||
406a3c63 | 447 | struct socket *sock_from_file(struct file *file, int *err) |
6cb153ca | 448 | { |
6cb153ca BL |
449 | if (file->f_op == &socket_file_ops) |
450 | return file->private_data; /* set in sock_map_fd */ | |
451 | ||
23bb80d2 ED |
452 | *err = -ENOTSOCK; |
453 | return NULL; | |
6cb153ca | 454 | } |
406a3c63 | 455 | EXPORT_SYMBOL(sock_from_file); |
6cb153ca | 456 | |
1da177e4 | 457 | /** |
c6d409cf | 458 | * sockfd_lookup - Go from a file number to its socket slot |
1da177e4 LT |
459 | * @fd: file handle |
460 | * @err: pointer to an error code return | |
461 | * | |
462 | * The file handle passed in is locked and the socket it is bound | |
241c4667 | 463 | * to is returned. If an error occurs the err pointer is overwritten |
1da177e4 LT |
464 | * with a negative errno code and NULL is returned. The function checks |
465 | * for both invalid handles and passing a handle which is not a socket. | |
466 | * | |
467 | * On a success the socket object pointer is returned. | |
468 | */ | |
469 | ||
470 | struct socket *sockfd_lookup(int fd, int *err) | |
471 | { | |
472 | struct file *file; | |
1da177e4 LT |
473 | struct socket *sock; |
474 | ||
89bddce5 SH |
475 | file = fget(fd); |
476 | if (!file) { | |
1da177e4 LT |
477 | *err = -EBADF; |
478 | return NULL; | |
479 | } | |
89bddce5 | 480 | |
6cb153ca BL |
481 | sock = sock_from_file(file, err); |
482 | if (!sock) | |
1da177e4 | 483 | fput(file); |
6cb153ca BL |
484 | return sock; |
485 | } | |
c6d409cf | 486 | EXPORT_SYMBOL(sockfd_lookup); |
1da177e4 | 487 | |
6cb153ca BL |
488 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
489 | { | |
00e188ef | 490 | struct fd f = fdget(fd); |
6cb153ca BL |
491 | struct socket *sock; |
492 | ||
3672558c | 493 | *err = -EBADF; |
00e188ef AV |
494 | if (f.file) { |
495 | sock = sock_from_file(f.file, err); | |
496 | if (likely(sock)) { | |
497 | *fput_needed = f.flags; | |
6cb153ca | 498 | return sock; |
00e188ef AV |
499 | } |
500 | fdput(f); | |
1da177e4 | 501 | } |
6cb153ca | 502 | return NULL; |
1da177e4 LT |
503 | } |
504 | ||
600e1779 MY |
505 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, |
506 | size_t size) | |
507 | { | |
508 | ssize_t len; | |
509 | ssize_t used = 0; | |
510 | ||
c5ef6035 | 511 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); |
600e1779 MY |
512 | if (len < 0) |
513 | return len; | |
514 | used += len; | |
515 | if (buffer) { | |
516 | if (size < used) | |
517 | return -ERANGE; | |
518 | buffer += len; | |
519 | } | |
520 | ||
521 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
522 | used += len; | |
523 | if (buffer) { | |
524 | if (size < used) | |
525 | return -ERANGE; | |
526 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
527 | buffer += len; | |
528 | } | |
529 | ||
530 | return used; | |
531 | } | |
532 | ||
dc647ec8 | 533 | static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) |
86741ec2 LC |
534 | { |
535 | int err = simple_setattr(dentry, iattr); | |
536 | ||
e1a3a60a | 537 | if (!err && (iattr->ia_valid & ATTR_UID)) { |
86741ec2 LC |
538 | struct socket *sock = SOCKET_I(d_inode(dentry)); |
539 | ||
6d8c50dc CW |
540 | if (sock->sk) |
541 | sock->sk->sk_uid = iattr->ia_uid; | |
542 | else | |
543 | err = -ENOENT; | |
86741ec2 LC |
544 | } |
545 | ||
546 | return err; | |
547 | } | |
548 | ||
600e1779 | 549 | static const struct inode_operations sockfs_inode_ops = { |
600e1779 | 550 | .listxattr = sockfs_listxattr, |
86741ec2 | 551 | .setattr = sockfs_setattr, |
600e1779 MY |
552 | }; |
553 | ||
1da177e4 | 554 | /** |
8a3c245c | 555 | * sock_alloc - allocate a socket |
89bddce5 | 556 | * |
1da177e4 LT |
557 | * Allocate a new inode and socket object. The two are bound together |
558 | * and initialised. The socket is then returned. If we are out of inodes | |
8a3c245c | 559 | * NULL is returned. This functions uses GFP_KERNEL internally. |
1da177e4 LT |
560 | */ |
561 | ||
f4a00aac | 562 | struct socket *sock_alloc(void) |
1da177e4 | 563 | { |
89bddce5 SH |
564 | struct inode *inode; |
565 | struct socket *sock; | |
1da177e4 | 566 | |
a209dfc7 | 567 | inode = new_inode_pseudo(sock_mnt->mnt_sb); |
1da177e4 LT |
568 | if (!inode) |
569 | return NULL; | |
570 | ||
571 | sock = SOCKET_I(inode); | |
572 | ||
85fe4025 | 573 | inode->i_ino = get_next_ino(); |
89bddce5 | 574 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
8192b0c4 DH |
575 | inode->i_uid = current_fsuid(); |
576 | inode->i_gid = current_fsgid(); | |
600e1779 | 577 | inode->i_op = &sockfs_inode_ops; |
1da177e4 | 578 | |
1da177e4 LT |
579 | return sock; |
580 | } | |
f4a00aac | 581 | EXPORT_SYMBOL(sock_alloc); |
1da177e4 | 582 | |
1da177e4 | 583 | /** |
8a3c245c | 584 | * sock_release - close a socket |
1da177e4 LT |
585 | * @sock: socket to close |
586 | * | |
587 | * The socket is released from the protocol stack if it has a release | |
588 | * callback, and the inode is then released if the socket is bound to | |
89bddce5 | 589 | * an inode not a file. |
1da177e4 | 590 | */ |
89bddce5 | 591 | |
6d8c50dc | 592 | static void __sock_release(struct socket *sock, struct inode *inode) |
1da177e4 LT |
593 | { |
594 | if (sock->ops) { | |
595 | struct module *owner = sock->ops->owner; | |
596 | ||
6d8c50dc CW |
597 | if (inode) |
598 | inode_lock(inode); | |
1da177e4 | 599 | sock->ops->release(sock); |
ff7b11aa | 600 | sock->sk = NULL; |
6d8c50dc CW |
601 | if (inode) |
602 | inode_unlock(inode); | |
1da177e4 LT |
603 | sock->ops = NULL; |
604 | module_put(owner); | |
605 | } | |
606 | ||
e6476c21 | 607 | if (sock->wq->fasync_list) |
3410f22e | 608 | pr_err("%s: fasync list not empty!\n", __func__); |
1da177e4 | 609 | |
1da177e4 LT |
610 | if (!sock->file) { |
611 | iput(SOCK_INODE(sock)); | |
612 | return; | |
613 | } | |
89bddce5 | 614 | sock->file = NULL; |
1da177e4 | 615 | } |
6d8c50dc CW |
616 | |
617 | void sock_release(struct socket *sock) | |
618 | { | |
619 | __sock_release(sock, NULL); | |
620 | } | |
c6d409cf | 621 | EXPORT_SYMBOL(sock_release); |
1da177e4 | 622 | |
c14ac945 | 623 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) |
20d49473 | 624 | { |
140c55d4 ED |
625 | u8 flags = *tx_flags; |
626 | ||
c14ac945 | 627 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) |
140c55d4 ED |
628 | flags |= SKBTX_HW_TSTAMP; |
629 | ||
c14ac945 | 630 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) |
140c55d4 ED |
631 | flags |= SKBTX_SW_TSTAMP; |
632 | ||
c14ac945 | 633 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) |
140c55d4 ED |
634 | flags |= SKBTX_SCHED_TSTAMP; |
635 | ||
140c55d4 | 636 | *tx_flags = flags; |
20d49473 | 637 | } |
67cc0d40 | 638 | EXPORT_SYMBOL(__sock_tx_timestamp); |
20d49473 | 639 | |
8a3c245c PT |
640 | /** |
641 | * sock_sendmsg - send a message through @sock | |
642 | * @sock: socket | |
643 | * @msg: message to send | |
644 | * | |
645 | * Sends @msg through @sock, passing through LSM. | |
646 | * Returns the number of bytes sent, or an error code. | |
647 | */ | |
648 | ||
d8725c86 | 649 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) |
1da177e4 | 650 | { |
01e97e65 | 651 | int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); |
d8725c86 AV |
652 | BUG_ON(ret == -EIOCBQUEUED); |
653 | return ret; | |
1da177e4 LT |
654 | } |
655 | ||
d8725c86 | 656 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) |
228e548e | 657 | { |
d8725c86 | 658 | int err = security_socket_sendmsg(sock, msg, |
01e97e65 | 659 | msg_data_left(msg)); |
228e548e | 660 | |
d8725c86 | 661 | return err ?: sock_sendmsg_nosec(sock, msg); |
0cf00c6f | 662 | } |
c6d409cf | 663 | EXPORT_SYMBOL(sock_sendmsg); |
1da177e4 | 664 | |
8a3c245c PT |
665 | /** |
666 | * kernel_sendmsg - send a message through @sock (kernel-space) | |
667 | * @sock: socket | |
668 | * @msg: message header | |
669 | * @vec: kernel vec | |
670 | * @num: vec array length | |
671 | * @size: total message data size | |
672 | * | |
673 | * Builds the message data with @vec and sends it through @sock. | |
674 | * Returns the number of bytes sent, or an error code. | |
675 | */ | |
676 | ||
1da177e4 LT |
677 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
678 | struct kvec *vec, size_t num, size_t size) | |
679 | { | |
aa563d7b | 680 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
d8725c86 | 681 | return sock_sendmsg(sock, msg); |
1da177e4 | 682 | } |
c6d409cf | 683 | EXPORT_SYMBOL(kernel_sendmsg); |
1da177e4 | 684 | |
8a3c245c PT |
685 | /** |
686 | * kernel_sendmsg_locked - send a message through @sock (kernel-space) | |
687 | * @sk: sock | |
688 | * @msg: message header | |
689 | * @vec: output s/g array | |
690 | * @num: output s/g array length | |
691 | * @size: total message data size | |
692 | * | |
693 | * Builds the message data with @vec and sends it through @sock. | |
694 | * Returns the number of bytes sent, or an error code. | |
695 | * Caller must hold @sk. | |
696 | */ | |
697 | ||
306b13eb TH |
698 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, |
699 | struct kvec *vec, size_t num, size_t size) | |
700 | { | |
701 | struct socket *sock = sk->sk_socket; | |
702 | ||
703 | if (!sock->ops->sendmsg_locked) | |
db5980d8 | 704 | return sock_no_sendmsg_locked(sk, msg, size); |
306b13eb | 705 | |
aa563d7b | 706 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
306b13eb TH |
707 | |
708 | return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); | |
709 | } | |
710 | EXPORT_SYMBOL(kernel_sendmsg_locked); | |
711 | ||
8605330a SHY |
712 | static bool skb_is_err_queue(const struct sk_buff *skb) |
713 | { | |
714 | /* pkt_type of skbs enqueued on the error queue are set to | |
715 | * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do | |
716 | * in recvmsg, since skbs received on a local socket will never | |
717 | * have a pkt_type of PACKET_OUTGOING. | |
718 | */ | |
719 | return skb->pkt_type == PACKET_OUTGOING; | |
720 | } | |
721 | ||
b50a5c70 ML |
722 | /* On transmit, software and hardware timestamps are returned independently. |
723 | * As the two skb clones share the hardware timestamp, which may be updated | |
724 | * before the software timestamp is received, a hardware TX timestamp may be | |
725 | * returned only if there is no software TX timestamp. Ignore false software | |
726 | * timestamps, which may be made in the __sock_recv_timestamp() call when the | |
7f1bc6e9 | 727 | * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a |
b50a5c70 ML |
728 | * hardware timestamp. |
729 | */ | |
730 | static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) | |
731 | { | |
732 | return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); | |
733 | } | |
734 | ||
aad9c8c4 ML |
735 | static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
736 | { | |
737 | struct scm_ts_pktinfo ts_pktinfo; | |
738 | struct net_device *orig_dev; | |
739 | ||
740 | if (!skb_mac_header_was_set(skb)) | |
741 | return; | |
742 | ||
743 | memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); | |
744 | ||
745 | rcu_read_lock(); | |
746 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
747 | if (orig_dev) | |
748 | ts_pktinfo.if_index = orig_dev->ifindex; | |
749 | rcu_read_unlock(); | |
750 | ||
751 | ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); | |
752 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, | |
753 | sizeof(ts_pktinfo), &ts_pktinfo); | |
754 | } | |
755 | ||
92f37fd2 ED |
756 | /* |
757 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
758 | */ | |
759 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
760 | struct sk_buff *skb) | |
761 | { | |
20d49473 | 762 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
887feae3 | 763 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
9718475e DD |
764 | struct scm_timestamping_internal tss; |
765 | ||
b50a5c70 | 766 | int empty = 1, false_tstamp = 0; |
20d49473 PO |
767 | struct skb_shared_hwtstamps *shhwtstamps = |
768 | skb_hwtstamps(skb); | |
769 | ||
770 | /* Race occurred between timestamp enabling and packet | |
771 | receiving. Fill in the current time for now. */ | |
b50a5c70 | 772 | if (need_software_tstamp && skb->tstamp == 0) { |
20d49473 | 773 | __net_timestamp(skb); |
b50a5c70 ML |
774 | false_tstamp = 1; |
775 | } | |
20d49473 PO |
776 | |
777 | if (need_software_tstamp) { | |
778 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 DD |
779 | if (new_tstamp) { |
780 | struct __kernel_sock_timeval tv; | |
781 | ||
782 | skb_get_new_timestamp(skb, &tv); | |
783 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, | |
784 | sizeof(tv), &tv); | |
785 | } else { | |
786 | struct __kernel_old_timeval tv; | |
787 | ||
788 | skb_get_timestamp(skb, &tv); | |
789 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, | |
790 | sizeof(tv), &tv); | |
791 | } | |
20d49473 | 792 | } else { |
887feae3 DD |
793 | if (new_tstamp) { |
794 | struct __kernel_timespec ts; | |
795 | ||
796 | skb_get_new_timestampns(skb, &ts); | |
797 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, | |
798 | sizeof(ts), &ts); | |
799 | } else { | |
800 | struct timespec ts; | |
801 | ||
802 | skb_get_timestampns(skb, &ts); | |
803 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, | |
804 | sizeof(ts), &ts); | |
805 | } | |
20d49473 PO |
806 | } |
807 | } | |
808 | ||
f24b9be5 | 809 | memset(&tss, 0, sizeof(tss)); |
c199105d | 810 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && |
9718475e | 811 | ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) |
20d49473 | 812 | empty = 0; |
4d276eb6 | 813 | if (shhwtstamps && |
b9f40e21 | 814 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
b50a5c70 | 815 | !skb_is_swtx_tstamp(skb, false_tstamp) && |
9718475e | 816 | ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { |
4d276eb6 | 817 | empty = 0; |
aad9c8c4 ML |
818 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && |
819 | !skb_is_err_queue(skb)) | |
820 | put_ts_pktinfo(msg, skb); | |
821 | } | |
1c885808 | 822 | if (!empty) { |
9718475e DD |
823 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) |
824 | put_cmsg_scm_timestamping64(msg, &tss); | |
825 | else | |
826 | put_cmsg_scm_timestamping(msg, &tss); | |
1c885808 | 827 | |
8605330a | 828 | if (skb_is_err_queue(skb) && skb->len && |
4ef1b286 | 829 | SKB_EXT_ERR(skb)->opt_stats) |
1c885808 FY |
830 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, |
831 | skb->len, skb->data); | |
832 | } | |
92f37fd2 | 833 | } |
7c81fd8b ACM |
834 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
835 | ||
6e3e939f JB |
836 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
837 | struct sk_buff *skb) | |
838 | { | |
839 | int ack; | |
840 | ||
841 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
842 | return; | |
843 | if (!skb->wifi_acked_valid) | |
844 | return; | |
845 | ||
846 | ack = skb->wifi_acked; | |
847 | ||
848 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
849 | } | |
850 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
851 | ||
11165f14 | 852 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
853 | struct sk_buff *skb) | |
3b885787 | 854 | { |
744d5a3e | 855 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) |
3b885787 | 856 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
744d5a3e | 857 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); |
3b885787 NH |
858 | } |
859 | ||
767dd033 | 860 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
3b885787 NH |
861 | struct sk_buff *skb) |
862 | { | |
863 | sock_recv_timestamp(msg, sk, skb); | |
864 | sock_recv_drops(msg, sk, skb); | |
865 | } | |
767dd033 | 866 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); |
3b885787 | 867 | |
8a3c245c PT |
868 | /** |
869 | * sock_recvmsg - receive a message from @sock | |
870 | * @sock: socket | |
871 | * @msg: message to receive | |
872 | * @flags: message flags | |
873 | * | |
874 | * Receives @msg from @sock, passing through LSM. Returns the total number | |
875 | * of bytes received, or an error. | |
876 | */ | |
877 | ||
1b784140 | 878 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
2da62906 | 879 | int flags) |
1da177e4 | 880 | { |
2da62906 | 881 | return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); |
1da177e4 LT |
882 | } |
883 | ||
2da62906 | 884 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) |
a2e27255 | 885 | { |
2da62906 | 886 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); |
a2e27255 | 887 | |
2da62906 | 888 | return err ?: sock_recvmsg_nosec(sock, msg, flags); |
1da177e4 | 889 | } |
c6d409cf | 890 | EXPORT_SYMBOL(sock_recvmsg); |
1da177e4 | 891 | |
c1249c0a | 892 | /** |
8a3c245c PT |
893 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
894 | * @sock: The socket to receive the message from | |
895 | * @msg: Received message | |
896 | * @vec: Input s/g array for message data | |
897 | * @num: Size of input s/g array | |
898 | * @size: Number of bytes to read | |
899 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
c1249c0a | 900 | * |
8a3c245c PT |
901 | * On return the msg structure contains the scatter/gather array passed in the |
902 | * vec argument. The array is modified so that it consists of the unfilled | |
903 | * portion of the original array. | |
c1249c0a | 904 | * |
8a3c245c | 905 | * The returned value is the total number of bytes received, or an error. |
c1249c0a | 906 | */ |
8a3c245c | 907 | |
89bddce5 SH |
908 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
909 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 LT |
910 | { |
911 | mm_segment_t oldfs = get_fs(); | |
912 | int result; | |
913 | ||
aa563d7b | 914 | iov_iter_kvec(&msg->msg_iter, READ, vec, num, size); |
1da177e4 | 915 | set_fs(KERNEL_DS); |
2da62906 | 916 | result = sock_recvmsg(sock, msg, flags); |
1da177e4 LT |
917 | set_fs(oldfs); |
918 | return result; | |
919 | } | |
c6d409cf | 920 | EXPORT_SYMBOL(kernel_recvmsg); |
1da177e4 | 921 | |
ce1d4d3e CH |
922 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
923 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 924 | { |
1da177e4 LT |
925 | struct socket *sock; |
926 | int flags; | |
927 | ||
ce1d4d3e CH |
928 | sock = file->private_data; |
929 | ||
35f9c09f ED |
930 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
931 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
932 | flags |= more; | |
ce1d4d3e | 933 | |
e6949583 | 934 | return kernel_sendpage(sock, page, offset, size, flags); |
ce1d4d3e | 935 | } |
1da177e4 | 936 | |
9c55e01c | 937 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 938 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c JA |
939 | unsigned int flags) |
940 | { | |
941 | struct socket *sock = file->private_data; | |
942 | ||
997b37da | 943 | if (unlikely(!sock->ops->splice_read)) |
95506588 | 944 | return generic_file_splice_read(file, ppos, pipe, len, flags); |
997b37da | 945 | |
9c55e01c JA |
946 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
947 | } | |
948 | ||
8ae5e030 | 949 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) |
ce1d4d3e | 950 | { |
6d652330 AV |
951 | struct file *file = iocb->ki_filp; |
952 | struct socket *sock = file->private_data; | |
0345f931 | 953 | struct msghdr msg = {.msg_iter = *to, |
954 | .msg_iocb = iocb}; | |
8ae5e030 | 955 | ssize_t res; |
ce1d4d3e | 956 | |
8ae5e030 AV |
957 | if (file->f_flags & O_NONBLOCK) |
958 | msg.msg_flags = MSG_DONTWAIT; | |
959 | ||
960 | if (iocb->ki_pos != 0) | |
1da177e4 | 961 | return -ESPIPE; |
027445c3 | 962 | |
66ee59af | 963 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ |
1da177e4 LT |
964 | return 0; |
965 | ||
2da62906 | 966 | res = sock_recvmsg(sock, &msg, msg.msg_flags); |
8ae5e030 AV |
967 | *to = msg.msg_iter; |
968 | return res; | |
1da177e4 LT |
969 | } |
970 | ||
8ae5e030 | 971 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ce1d4d3e | 972 | { |
6d652330 AV |
973 | struct file *file = iocb->ki_filp; |
974 | struct socket *sock = file->private_data; | |
0345f931 | 975 | struct msghdr msg = {.msg_iter = *from, |
976 | .msg_iocb = iocb}; | |
8ae5e030 | 977 | ssize_t res; |
1da177e4 | 978 | |
8ae5e030 | 979 | if (iocb->ki_pos != 0) |
ce1d4d3e | 980 | return -ESPIPE; |
027445c3 | 981 | |
8ae5e030 AV |
982 | if (file->f_flags & O_NONBLOCK) |
983 | msg.msg_flags = MSG_DONTWAIT; | |
984 | ||
6d652330 AV |
985 | if (sock->type == SOCK_SEQPACKET) |
986 | msg.msg_flags |= MSG_EOR; | |
987 | ||
d8725c86 | 988 | res = sock_sendmsg(sock, &msg); |
8ae5e030 AV |
989 | *from = msg.msg_iter; |
990 | return res; | |
1da177e4 LT |
991 | } |
992 | ||
1da177e4 LT |
993 | /* |
994 | * Atomic setting of ioctl hooks to avoid race | |
995 | * with module unload. | |
996 | */ | |
997 | ||
4a3e2f71 | 998 | static DEFINE_MUTEX(br_ioctl_mutex); |
c6d409cf | 999 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); |
1da177e4 | 1000 | |
881d966b | 1001 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
1da177e4 | 1002 | { |
4a3e2f71 | 1003 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 1004 | br_ioctl_hook = hook; |
4a3e2f71 | 1005 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1006 | } |
1007 | EXPORT_SYMBOL(brioctl_set); | |
1008 | ||
4a3e2f71 | 1009 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 1010 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 1011 | |
881d966b | 1012 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 1013 | { |
4a3e2f71 | 1014 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1015 | vlan_ioctl_hook = hook; |
4a3e2f71 | 1016 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 LT |
1017 | } |
1018 | EXPORT_SYMBOL(vlan_ioctl_set); | |
1019 | ||
4a3e2f71 | 1020 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
89bddce5 | 1021 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1da177e4 | 1022 | |
89bddce5 | 1023 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 1024 | { |
4a3e2f71 | 1025 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 1026 | dlci_ioctl_hook = hook; |
4a3e2f71 | 1027 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 LT |
1028 | } |
1029 | EXPORT_SYMBOL(dlci_ioctl_set); | |
1030 | ||
6b96018b | 1031 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
63ff03ab | 1032 | unsigned int cmd, unsigned long arg) |
6b96018b AB |
1033 | { |
1034 | int err; | |
1035 | void __user *argp = (void __user *)arg; | |
1036 | ||
1037 | err = sock->ops->ioctl(sock, cmd, arg); | |
1038 | ||
1039 | /* | |
1040 | * If this ioctl is unknown try to hand it down | |
1041 | * to the NIC driver. | |
1042 | */ | |
36fd633e AV |
1043 | if (err != -ENOIOCTLCMD) |
1044 | return err; | |
6b96018b | 1045 | |
36fd633e AV |
1046 | if (cmd == SIOCGIFCONF) { |
1047 | struct ifconf ifc; | |
1048 | if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) | |
1049 | return -EFAULT; | |
1050 | rtnl_lock(); | |
1051 | err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); | |
1052 | rtnl_unlock(); | |
1053 | if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) | |
1054 | err = -EFAULT; | |
44c02a2c AV |
1055 | } else { |
1056 | struct ifreq ifr; | |
1057 | bool need_copyout; | |
63ff03ab | 1058 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) |
44c02a2c AV |
1059 | return -EFAULT; |
1060 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); | |
1061 | if (!err && need_copyout) | |
63ff03ab | 1062 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) |
44c02a2c | 1063 | return -EFAULT; |
36fd633e | 1064 | } |
6b96018b AB |
1065 | return err; |
1066 | } | |
1067 | ||
1da177e4 LT |
1068 | /* |
1069 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
1070 | * what to do with it - that's up to the protocol still. | |
1071 | */ | |
1072 | ||
8a3c245c PT |
1073 | /** |
1074 | * get_net_ns - increment the refcount of the network namespace | |
1075 | * @ns: common namespace (net) | |
1076 | * | |
1077 | * Returns the net's common namespace. | |
1078 | */ | |
1079 | ||
d8d211a2 | 1080 | struct ns_common *get_net_ns(struct ns_common *ns) |
c62cce2c AV |
1081 | { |
1082 | return &get_net(container_of(ns, struct net, ns))->ns; | |
1083 | } | |
d8d211a2 | 1084 | EXPORT_SYMBOL_GPL(get_net_ns); |
c62cce2c | 1085 | |
1da177e4 LT |
1086 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1087 | { | |
1088 | struct socket *sock; | |
881d966b | 1089 | struct sock *sk; |
1da177e4 LT |
1090 | void __user *argp = (void __user *)arg; |
1091 | int pid, err; | |
881d966b | 1092 | struct net *net; |
1da177e4 | 1093 | |
b69aee04 | 1094 | sock = file->private_data; |
881d966b | 1095 | sk = sock->sk; |
3b1e0a65 | 1096 | net = sock_net(sk); |
44c02a2c AV |
1097 | if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { |
1098 | struct ifreq ifr; | |
1099 | bool need_copyout; | |
1100 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) | |
1101 | return -EFAULT; | |
1102 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); | |
1103 | if (!err && need_copyout) | |
1104 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) | |
1105 | return -EFAULT; | |
1da177e4 | 1106 | } else |
3d23e349 | 1107 | #ifdef CONFIG_WEXT_CORE |
1da177e4 | 1108 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
b1b0c245 | 1109 | err = wext_handle_ioctl(net, cmd, argp); |
1da177e4 | 1110 | } else |
3d23e349 | 1111 | #endif |
89bddce5 | 1112 | switch (cmd) { |
1da177e4 LT |
1113 | case FIOSETOWN: |
1114 | case SIOCSPGRP: | |
1115 | err = -EFAULT; | |
1116 | if (get_user(pid, (int __user *)argp)) | |
1117 | break; | |
393cc3f5 | 1118 | err = f_setown(sock->file, pid, 1); |
1da177e4 LT |
1119 | break; |
1120 | case FIOGETOWN: | |
1121 | case SIOCGPGRP: | |
609d7fa9 | 1122 | err = put_user(f_getown(sock->file), |
89bddce5 | 1123 | (int __user *)argp); |
1da177e4 LT |
1124 | break; |
1125 | case SIOCGIFBR: | |
1126 | case SIOCSIFBR: | |
1127 | case SIOCBRADDBR: | |
1128 | case SIOCBRDELBR: | |
1129 | err = -ENOPKG; | |
1130 | if (!br_ioctl_hook) | |
1131 | request_module("bridge"); | |
1132 | ||
4a3e2f71 | 1133 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 1134 | if (br_ioctl_hook) |
881d966b | 1135 | err = br_ioctl_hook(net, cmd, argp); |
4a3e2f71 | 1136 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1137 | break; |
1138 | case SIOCGIFVLAN: | |
1139 | case SIOCSIFVLAN: | |
1140 | err = -ENOPKG; | |
1141 | if (!vlan_ioctl_hook) | |
1142 | request_module("8021q"); | |
1143 | ||
4a3e2f71 | 1144 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1145 | if (vlan_ioctl_hook) |
881d966b | 1146 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 1147 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 1148 | break; |
1da177e4 LT |
1149 | case SIOCADDDLCI: |
1150 | case SIOCDELDLCI: | |
1151 | err = -ENOPKG; | |
1152 | if (!dlci_ioctl_hook) | |
1153 | request_module("dlci"); | |
1154 | ||
7512cbf6 PE |
1155 | mutex_lock(&dlci_ioctl_mutex); |
1156 | if (dlci_ioctl_hook) | |
1da177e4 | 1157 | err = dlci_ioctl_hook(cmd, argp); |
7512cbf6 | 1158 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 | 1159 | break; |
c62cce2c AV |
1160 | case SIOCGSKNS: |
1161 | err = -EPERM; | |
1162 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1163 | break; | |
1164 | ||
1165 | err = open_related_ns(&net->ns, get_net_ns); | |
1166 | break; | |
0768e170 AB |
1167 | case SIOCGSTAMP_OLD: |
1168 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
1169 | if (!sock->ops->gettstamp) { |
1170 | err = -ENOIOCTLCMD; | |
1171 | break; | |
1172 | } | |
1173 | err = sock->ops->gettstamp(sock, argp, | |
0768e170 AB |
1174 | cmd == SIOCGSTAMP_OLD, |
1175 | !IS_ENABLED(CONFIG_64BIT)); | |
1176 | case SIOCGSTAMP_NEW: | |
1177 | case SIOCGSTAMPNS_NEW: | |
1178 | if (!sock->ops->gettstamp) { | |
1179 | err = -ENOIOCTLCMD; | |
1180 | break; | |
1181 | } | |
1182 | err = sock->ops->gettstamp(sock, argp, | |
1183 | cmd == SIOCGSTAMP_NEW, | |
1184 | false); | |
c7cbdbf2 | 1185 | break; |
1da177e4 | 1186 | default: |
63ff03ab | 1187 | err = sock_do_ioctl(net, sock, cmd, arg); |
1da177e4 | 1188 | break; |
89bddce5 | 1189 | } |
1da177e4 LT |
1190 | return err; |
1191 | } | |
1192 | ||
8a3c245c PT |
1193 | /** |
1194 | * sock_create_lite - creates a socket | |
1195 | * @family: protocol family (AF_INET, ...) | |
1196 | * @type: communication type (SOCK_STREAM, ...) | |
1197 | * @protocol: protocol (0, ...) | |
1198 | * @res: new socket | |
1199 | * | |
1200 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1201 | * The new socket initialization is not complete, see kernel_accept(). | |
1202 | * Returns 0 or an error. On failure @res is set to %NULL. | |
1203 | * This function internally uses GFP_KERNEL. | |
1204 | */ | |
1205 | ||
1da177e4 LT |
1206 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
1207 | { | |
1208 | int err; | |
1209 | struct socket *sock = NULL; | |
89bddce5 | 1210 | |
1da177e4 LT |
1211 | err = security_socket_create(family, type, protocol, 1); |
1212 | if (err) | |
1213 | goto out; | |
1214 | ||
1215 | sock = sock_alloc(); | |
1216 | if (!sock) { | |
1217 | err = -ENOMEM; | |
1218 | goto out; | |
1219 | } | |
1220 | ||
1da177e4 | 1221 | sock->type = type; |
7420ed23 VY |
1222 | err = security_socket_post_create(sock, family, type, protocol, 1); |
1223 | if (err) | |
1224 | goto out_release; | |
1225 | ||
1da177e4 LT |
1226 | out: |
1227 | *res = sock; | |
1228 | return err; | |
7420ed23 VY |
1229 | out_release: |
1230 | sock_release(sock); | |
1231 | sock = NULL; | |
1232 | goto out; | |
1da177e4 | 1233 | } |
c6d409cf | 1234 | EXPORT_SYMBOL(sock_create_lite); |
1da177e4 LT |
1235 | |
1236 | /* No kernel lock held - perfect */ | |
ade994f4 | 1237 | static __poll_t sock_poll(struct file *file, poll_table *wait) |
1da177e4 | 1238 | { |
3cafb376 | 1239 | struct socket *sock = file->private_data; |
a331de3b | 1240 | __poll_t events = poll_requested_events(wait), flag = 0; |
2d48d67f | 1241 | |
e88958e6 CH |
1242 | if (!sock->ops->poll) |
1243 | return 0; | |
f641f13b | 1244 | |
a331de3b CH |
1245 | if (sk_can_busy_loop(sock->sk)) { |
1246 | /* poll once if requested by the syscall */ | |
1247 | if (events & POLL_BUSY_LOOP) | |
1248 | sk_busy_loop(sock->sk, 1); | |
1249 | ||
1250 | /* if this socket can poll_ll, tell the system call */ | |
1251 | flag = POLL_BUSY_LOOP; | |
1252 | } | |
1253 | ||
1254 | return sock->ops->poll(file, sock, wait) | flag; | |
1da177e4 LT |
1255 | } |
1256 | ||
89bddce5 | 1257 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 1258 | { |
b69aee04 | 1259 | struct socket *sock = file->private_data; |
1da177e4 LT |
1260 | |
1261 | return sock->ops->mmap(file, sock, vma); | |
1262 | } | |
1263 | ||
20380731 | 1264 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 | 1265 | { |
6d8c50dc | 1266 | __sock_release(SOCKET_I(inode), inode); |
1da177e4 LT |
1267 | return 0; |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Update the socket async list | |
1272 | * | |
1273 | * Fasync_list locking strategy. | |
1274 | * | |
1275 | * 1. fasync_list is modified only under process context socket lock | |
1276 | * i.e. under semaphore. | |
1277 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
989a2979 | 1278 | * or under socket lock |
1da177e4 LT |
1279 | */ |
1280 | ||
1281 | static int sock_fasync(int fd, struct file *filp, int on) | |
1282 | { | |
989a2979 ED |
1283 | struct socket *sock = filp->private_data; |
1284 | struct sock *sk = sock->sk; | |
eaefd110 | 1285 | struct socket_wq *wq; |
1da177e4 | 1286 | |
989a2979 | 1287 | if (sk == NULL) |
1da177e4 | 1288 | return -EINVAL; |
1da177e4 LT |
1289 | |
1290 | lock_sock(sk); | |
e6476c21 | 1291 | wq = sock->wq; |
eaefd110 | 1292 | fasync_helper(fd, filp, on, &wq->fasync_list); |
1da177e4 | 1293 | |
eaefd110 | 1294 | if (!wq->fasync_list) |
989a2979 ED |
1295 | sock_reset_flag(sk, SOCK_FASYNC); |
1296 | else | |
bcdce719 | 1297 | sock_set_flag(sk, SOCK_FASYNC); |
1da177e4 | 1298 | |
989a2979 | 1299 | release_sock(sk); |
1da177e4 LT |
1300 | return 0; |
1301 | } | |
1302 | ||
ceb5d58b | 1303 | /* This function may be called only under rcu_lock */ |
1da177e4 | 1304 | |
ceb5d58b | 1305 | int sock_wake_async(struct socket_wq *wq, int how, int band) |
1da177e4 | 1306 | { |
ceb5d58b | 1307 | if (!wq || !wq->fasync_list) |
1da177e4 | 1308 | return -1; |
ceb5d58b | 1309 | |
89bddce5 | 1310 | switch (how) { |
8d8ad9d7 | 1311 | case SOCK_WAKE_WAITD: |
ceb5d58b | 1312 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) |
1da177e4 LT |
1313 | break; |
1314 | goto call_kill; | |
8d8ad9d7 | 1315 | case SOCK_WAKE_SPACE: |
ceb5d58b | 1316 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) |
1da177e4 LT |
1317 | break; |
1318 | /* fall through */ | |
8d8ad9d7 | 1319 | case SOCK_WAKE_IO: |
89bddce5 | 1320 | call_kill: |
43815482 | 1321 | kill_fasync(&wq->fasync_list, SIGIO, band); |
1da177e4 | 1322 | break; |
8d8ad9d7 | 1323 | case SOCK_WAKE_URG: |
43815482 | 1324 | kill_fasync(&wq->fasync_list, SIGURG, band); |
1da177e4 | 1325 | } |
ceb5d58b | 1326 | |
1da177e4 LT |
1327 | return 0; |
1328 | } | |
c6d409cf | 1329 | EXPORT_SYMBOL(sock_wake_async); |
1da177e4 | 1330 | |
8a3c245c PT |
1331 | /** |
1332 | * __sock_create - creates a socket | |
1333 | * @net: net namespace | |
1334 | * @family: protocol family (AF_INET, ...) | |
1335 | * @type: communication type (SOCK_STREAM, ...) | |
1336 | * @protocol: protocol (0, ...) | |
1337 | * @res: new socket | |
1338 | * @kern: boolean for kernel space sockets | |
1339 | * | |
1340 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1341 | * Returns 0 or an error. On failure @res is set to %NULL. @kern must | |
1342 | * be set to true if the socket resides in kernel space. | |
1343 | * This function internally uses GFP_KERNEL. | |
1344 | */ | |
1345 | ||
721db93a | 1346 | int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1347 | struct socket **res, int kern) |
1da177e4 LT |
1348 | { |
1349 | int err; | |
1350 | struct socket *sock; | |
55737fda | 1351 | const struct net_proto_family *pf; |
1da177e4 LT |
1352 | |
1353 | /* | |
89bddce5 | 1354 | * Check protocol is in range |
1da177e4 LT |
1355 | */ |
1356 | if (family < 0 || family >= NPROTO) | |
1357 | return -EAFNOSUPPORT; | |
1358 | if (type < 0 || type >= SOCK_MAX) | |
1359 | return -EINVAL; | |
1360 | ||
1361 | /* Compatibility. | |
1362 | ||
1363 | This uglymoron is moved from INET layer to here to avoid | |
1364 | deadlock in module load. | |
1365 | */ | |
1366 | if (family == PF_INET && type == SOCK_PACKET) { | |
f3c98690 | 1367 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1368 | current->comm); | |
1da177e4 LT |
1369 | family = PF_PACKET; |
1370 | } | |
1371 | ||
1372 | err = security_socket_create(family, type, protocol, kern); | |
1373 | if (err) | |
1374 | return err; | |
89bddce5 | 1375 | |
55737fda SH |
1376 | /* |
1377 | * Allocate the socket and allow the family to set things up. if | |
1378 | * the protocol is 0, the family is instructed to select an appropriate | |
1379 | * default. | |
1380 | */ | |
1381 | sock = sock_alloc(); | |
1382 | if (!sock) { | |
e87cc472 | 1383 | net_warn_ratelimited("socket: no more sockets\n"); |
55737fda SH |
1384 | return -ENFILE; /* Not exactly a match, but its the |
1385 | closest posix thing */ | |
1386 | } | |
1387 | ||
1388 | sock->type = type; | |
1389 | ||
95a5afca | 1390 | #ifdef CONFIG_MODULES |
89bddce5 SH |
1391 | /* Attempt to load a protocol module if the find failed. |
1392 | * | |
1393 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1394 | * requested real, full-featured networking support upon configuration. |
1395 | * Otherwise module support will break! | |
1396 | */ | |
190683a9 | 1397 | if (rcu_access_pointer(net_families[family]) == NULL) |
89bddce5 | 1398 | request_module("net-pf-%d", family); |
1da177e4 LT |
1399 | #endif |
1400 | ||
55737fda SH |
1401 | rcu_read_lock(); |
1402 | pf = rcu_dereference(net_families[family]); | |
1403 | err = -EAFNOSUPPORT; | |
1404 | if (!pf) | |
1405 | goto out_release; | |
1da177e4 LT |
1406 | |
1407 | /* | |
1408 | * We will call the ->create function, that possibly is in a loadable | |
1409 | * module, so we have to bump that loadable module refcnt first. | |
1410 | */ | |
55737fda | 1411 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1412 | goto out_release; |
1413 | ||
55737fda SH |
1414 | /* Now protected by module ref count */ |
1415 | rcu_read_unlock(); | |
1416 | ||
3f378b68 | 1417 | err = pf->create(net, sock, protocol, kern); |
55737fda | 1418 | if (err < 0) |
1da177e4 | 1419 | goto out_module_put; |
a79af59e | 1420 | |
1da177e4 LT |
1421 | /* |
1422 | * Now to bump the refcnt of the [loadable] module that owns this | |
1423 | * socket at sock_release time we decrement its refcnt. | |
1424 | */ | |
55737fda SH |
1425 | if (!try_module_get(sock->ops->owner)) |
1426 | goto out_module_busy; | |
1427 | ||
1da177e4 LT |
1428 | /* |
1429 | * Now that we're done with the ->create function, the [loadable] | |
1430 | * module can have its refcnt decremented | |
1431 | */ | |
55737fda | 1432 | module_put(pf->owner); |
7420ed23 VY |
1433 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1434 | if (err) | |
3b185525 | 1435 | goto out_sock_release; |
55737fda | 1436 | *res = sock; |
1da177e4 | 1437 | |
55737fda SH |
1438 | return 0; |
1439 | ||
1440 | out_module_busy: | |
1441 | err = -EAFNOSUPPORT; | |
1da177e4 | 1442 | out_module_put: |
55737fda SH |
1443 | sock->ops = NULL; |
1444 | module_put(pf->owner); | |
1445 | out_sock_release: | |
1da177e4 | 1446 | sock_release(sock); |
55737fda SH |
1447 | return err; |
1448 | ||
1449 | out_release: | |
1450 | rcu_read_unlock(); | |
1451 | goto out_sock_release; | |
1da177e4 | 1452 | } |
721db93a | 1453 | EXPORT_SYMBOL(__sock_create); |
1da177e4 | 1454 | |
8a3c245c PT |
1455 | /** |
1456 | * sock_create - creates a socket | |
1457 | * @family: protocol family (AF_INET, ...) | |
1458 | * @type: communication type (SOCK_STREAM, ...) | |
1459 | * @protocol: protocol (0, ...) | |
1460 | * @res: new socket | |
1461 | * | |
1462 | * A wrapper around __sock_create(). | |
1463 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1464 | */ | |
1465 | ||
1da177e4 LT |
1466 | int sock_create(int family, int type, int protocol, struct socket **res) |
1467 | { | |
1b8d7ae4 | 1468 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 | 1469 | } |
c6d409cf | 1470 | EXPORT_SYMBOL(sock_create); |
1da177e4 | 1471 | |
8a3c245c PT |
1472 | /** |
1473 | * sock_create_kern - creates a socket (kernel space) | |
1474 | * @net: net namespace | |
1475 | * @family: protocol family (AF_INET, ...) | |
1476 | * @type: communication type (SOCK_STREAM, ...) | |
1477 | * @protocol: protocol (0, ...) | |
1478 | * @res: new socket | |
1479 | * | |
1480 | * A wrapper around __sock_create(). | |
1481 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1482 | */ | |
1483 | ||
eeb1bd5c | 1484 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) |
1da177e4 | 1485 | { |
eeb1bd5c | 1486 | return __sock_create(net, family, type, protocol, res, 1); |
1da177e4 | 1487 | } |
c6d409cf | 1488 | EXPORT_SYMBOL(sock_create_kern); |
1da177e4 | 1489 | |
9d6a15c3 | 1490 | int __sys_socket(int family, int type, int protocol) |
1da177e4 LT |
1491 | { |
1492 | int retval; | |
1493 | struct socket *sock; | |
a677a039 UD |
1494 | int flags; |
1495 | ||
e38b36f3 UD |
1496 | /* Check the SOCK_* constants for consistency. */ |
1497 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1498 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1499 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1500 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1501 | ||
a677a039 | 1502 | flags = type & ~SOCK_TYPE_MASK; |
77d27200 | 1503 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1504 | return -EINVAL; |
1505 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1506 | |
aaca0bdc UD |
1507 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1508 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1509 | ||
1da177e4 LT |
1510 | retval = sock_create(family, type, protocol, &sock); |
1511 | if (retval < 0) | |
8e1611e2 | 1512 | return retval; |
1da177e4 | 1513 | |
8e1611e2 | 1514 | return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1da177e4 LT |
1515 | } |
1516 | ||
9d6a15c3 DB |
1517 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
1518 | { | |
1519 | return __sys_socket(family, type, protocol); | |
1520 | } | |
1521 | ||
1da177e4 LT |
1522 | /* |
1523 | * Create a pair of connected sockets. | |
1524 | */ | |
1525 | ||
6debc8d8 | 1526 | int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) |
1da177e4 LT |
1527 | { |
1528 | struct socket *sock1, *sock2; | |
1529 | int fd1, fd2, err; | |
db349509 | 1530 | struct file *newfile1, *newfile2; |
a677a039 UD |
1531 | int flags; |
1532 | ||
1533 | flags = type & ~SOCK_TYPE_MASK; | |
77d27200 | 1534 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1535 | return -EINVAL; |
1536 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1537 | |
aaca0bdc UD |
1538 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1539 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1540 | ||
016a266b AV |
1541 | /* |
1542 | * reserve descriptors and make sure we won't fail | |
1543 | * to return them to userland. | |
1544 | */ | |
1545 | fd1 = get_unused_fd_flags(flags); | |
1546 | if (unlikely(fd1 < 0)) | |
1547 | return fd1; | |
1548 | ||
1549 | fd2 = get_unused_fd_flags(flags); | |
1550 | if (unlikely(fd2 < 0)) { | |
1551 | put_unused_fd(fd1); | |
1552 | return fd2; | |
1553 | } | |
1554 | ||
1555 | err = put_user(fd1, &usockvec[0]); | |
1556 | if (err) | |
1557 | goto out; | |
1558 | ||
1559 | err = put_user(fd2, &usockvec[1]); | |
1560 | if (err) | |
1561 | goto out; | |
1562 | ||
1da177e4 LT |
1563 | /* |
1564 | * Obtain the first socket and check if the underlying protocol | |
1565 | * supports the socketpair call. | |
1566 | */ | |
1567 | ||
1568 | err = sock_create(family, type, protocol, &sock1); | |
016a266b | 1569 | if (unlikely(err < 0)) |
1da177e4 LT |
1570 | goto out; |
1571 | ||
1572 | err = sock_create(family, type, protocol, &sock2); | |
016a266b AV |
1573 | if (unlikely(err < 0)) { |
1574 | sock_release(sock1); | |
1575 | goto out; | |
bf3c23d1 | 1576 | } |
d73aa286 | 1577 | |
d47cd945 DH |
1578 | err = security_socket_socketpair(sock1, sock2); |
1579 | if (unlikely(err)) { | |
1580 | sock_release(sock2); | |
1581 | sock_release(sock1); | |
1582 | goto out; | |
1583 | } | |
1584 | ||
016a266b AV |
1585 | err = sock1->ops->socketpair(sock1, sock2); |
1586 | if (unlikely(err < 0)) { | |
1587 | sock_release(sock2); | |
1588 | sock_release(sock1); | |
1589 | goto out; | |
28407630 AV |
1590 | } |
1591 | ||
aab174f0 | 1592 | newfile1 = sock_alloc_file(sock1, flags, NULL); |
b5ffe634 | 1593 | if (IS_ERR(newfile1)) { |
28407630 | 1594 | err = PTR_ERR(newfile1); |
016a266b AV |
1595 | sock_release(sock2); |
1596 | goto out; | |
28407630 AV |
1597 | } |
1598 | ||
aab174f0 | 1599 | newfile2 = sock_alloc_file(sock2, flags, NULL); |
28407630 AV |
1600 | if (IS_ERR(newfile2)) { |
1601 | err = PTR_ERR(newfile2); | |
016a266b AV |
1602 | fput(newfile1); |
1603 | goto out; | |
db349509 AV |
1604 | } |
1605 | ||
157cf649 | 1606 | audit_fd_pair(fd1, fd2); |
d73aa286 | 1607 | |
db349509 AV |
1608 | fd_install(fd1, newfile1); |
1609 | fd_install(fd2, newfile2); | |
d73aa286 | 1610 | return 0; |
1da177e4 | 1611 | |
016a266b | 1612 | out: |
d73aa286 | 1613 | put_unused_fd(fd2); |
d73aa286 | 1614 | put_unused_fd(fd1); |
1da177e4 LT |
1615 | return err; |
1616 | } | |
1617 | ||
6debc8d8 DB |
1618 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
1619 | int __user *, usockvec) | |
1620 | { | |
1621 | return __sys_socketpair(family, type, protocol, usockvec); | |
1622 | } | |
1623 | ||
1da177e4 LT |
1624 | /* |
1625 | * Bind a name to a socket. Nothing much to do here since it's | |
1626 | * the protocol's responsibility to handle the local address. | |
1627 | * | |
1628 | * We move the socket address to kernel space before we call | |
1629 | * the protocol layer (having also checked the address is ok). | |
1630 | */ | |
1631 | ||
a87d35d8 | 1632 | int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
1da177e4 LT |
1633 | { |
1634 | struct socket *sock; | |
230b1839 | 1635 | struct sockaddr_storage address; |
6cb153ca | 1636 | int err, fput_needed; |
1da177e4 | 1637 | |
89bddce5 | 1638 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1639 | if (sock) { |
43db362d | 1640 | err = move_addr_to_kernel(umyaddr, addrlen, &address); |
068b88cc | 1641 | if (!err) { |
89bddce5 | 1642 | err = security_socket_bind(sock, |
230b1839 | 1643 | (struct sockaddr *)&address, |
89bddce5 | 1644 | addrlen); |
6cb153ca BL |
1645 | if (!err) |
1646 | err = sock->ops->bind(sock, | |
89bddce5 | 1647 | (struct sockaddr *) |
230b1839 | 1648 | &address, addrlen); |
1da177e4 | 1649 | } |
6cb153ca | 1650 | fput_light(sock->file, fput_needed); |
89bddce5 | 1651 | } |
1da177e4 LT |
1652 | return err; |
1653 | } | |
1654 | ||
a87d35d8 DB |
1655 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
1656 | { | |
1657 | return __sys_bind(fd, umyaddr, addrlen); | |
1658 | } | |
1659 | ||
1da177e4 LT |
1660 | /* |
1661 | * Perform a listen. Basically, we allow the protocol to do anything | |
1662 | * necessary for a listen, and if that works, we mark the socket as | |
1663 | * ready for listening. | |
1664 | */ | |
1665 | ||
25e290ee | 1666 | int __sys_listen(int fd, int backlog) |
1da177e4 LT |
1667 | { |
1668 | struct socket *sock; | |
6cb153ca | 1669 | int err, fput_needed; |
b8e1f9b5 | 1670 | int somaxconn; |
89bddce5 SH |
1671 | |
1672 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1673 | if (sock) { | |
8efa6e93 | 1674 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; |
95c96174 | 1675 | if ((unsigned int)backlog > somaxconn) |
b8e1f9b5 | 1676 | backlog = somaxconn; |
1da177e4 LT |
1677 | |
1678 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1679 | if (!err) |
1680 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1681 | |
6cb153ca | 1682 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1683 | } |
1684 | return err; | |
1685 | } | |
1686 | ||
25e290ee DB |
1687 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
1688 | { | |
1689 | return __sys_listen(fd, backlog); | |
1690 | } | |
1691 | ||
1da177e4 LT |
1692 | /* |
1693 | * For accept, we attempt to create a new socket, set up the link | |
1694 | * with the client, wake up the client, then return the new | |
1695 | * connected fd. We collect the address of the connector in kernel | |
1696 | * space and move it to user at the very end. This is unclean because | |
1697 | * we open the socket then return an error. | |
1698 | * | |
1699 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1700 | * status to recvmsg. We need to add that support in a way thats | |
b903036a | 1701 | * clean when we restructure accept also. |
1da177e4 LT |
1702 | */ |
1703 | ||
4541e805 DB |
1704 | int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, |
1705 | int __user *upeer_addrlen, int flags) | |
1da177e4 LT |
1706 | { |
1707 | struct socket *sock, *newsock; | |
39d8c1b6 | 1708 | struct file *newfile; |
6cb153ca | 1709 | int err, len, newfd, fput_needed; |
230b1839 | 1710 | struct sockaddr_storage address; |
1da177e4 | 1711 | |
77d27200 | 1712 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
aaca0bdc UD |
1713 | return -EINVAL; |
1714 | ||
1715 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1716 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1717 | ||
6cb153ca | 1718 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1719 | if (!sock) |
1720 | goto out; | |
1721 | ||
1722 | err = -ENFILE; | |
c6d409cf ED |
1723 | newsock = sock_alloc(); |
1724 | if (!newsock) | |
1da177e4 LT |
1725 | goto out_put; |
1726 | ||
1727 | newsock->type = sock->type; | |
1728 | newsock->ops = sock->ops; | |
1729 | ||
1da177e4 LT |
1730 | /* |
1731 | * We don't need try_module_get here, as the listening socket (sock) | |
1732 | * has the protocol module (sock->ops->owner) held. | |
1733 | */ | |
1734 | __module_get(newsock->ops->owner); | |
1735 | ||
28407630 | 1736 | newfd = get_unused_fd_flags(flags); |
39d8c1b6 DM |
1737 | if (unlikely(newfd < 0)) { |
1738 | err = newfd; | |
9a1875e6 DM |
1739 | sock_release(newsock); |
1740 | goto out_put; | |
39d8c1b6 | 1741 | } |
aab174f0 | 1742 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); |
b5ffe634 | 1743 | if (IS_ERR(newfile)) { |
28407630 AV |
1744 | err = PTR_ERR(newfile); |
1745 | put_unused_fd(newfd); | |
28407630 AV |
1746 | goto out_put; |
1747 | } | |
39d8c1b6 | 1748 | |
a79af59e FF |
1749 | err = security_socket_accept(sock, newsock); |
1750 | if (err) | |
39d8c1b6 | 1751 | goto out_fd; |
a79af59e | 1752 | |
cdfbabfb | 1753 | err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); |
1da177e4 | 1754 | if (err < 0) |
39d8c1b6 | 1755 | goto out_fd; |
1da177e4 LT |
1756 | |
1757 | if (upeer_sockaddr) { | |
9b2c45d4 DV |
1758 | len = newsock->ops->getname(newsock, |
1759 | (struct sockaddr *)&address, 2); | |
1760 | if (len < 0) { | |
1da177e4 | 1761 | err = -ECONNABORTED; |
39d8c1b6 | 1762 | goto out_fd; |
1da177e4 | 1763 | } |
43db362d | 1764 | err = move_addr_to_user(&address, |
230b1839 | 1765 | len, upeer_sockaddr, upeer_addrlen); |
1da177e4 | 1766 | if (err < 0) |
39d8c1b6 | 1767 | goto out_fd; |
1da177e4 LT |
1768 | } |
1769 | ||
1770 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1771 | ||
39d8c1b6 DM |
1772 | fd_install(newfd, newfile); |
1773 | err = newfd; | |
1da177e4 | 1774 | |
1da177e4 | 1775 | out_put: |
6cb153ca | 1776 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1777 | out: |
1778 | return err; | |
39d8c1b6 | 1779 | out_fd: |
9606a216 | 1780 | fput(newfile); |
39d8c1b6 | 1781 | put_unused_fd(newfd); |
1da177e4 LT |
1782 | goto out_put; |
1783 | } | |
1784 | ||
4541e805 DB |
1785 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1786 | int __user *, upeer_addrlen, int, flags) | |
1787 | { | |
1788 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); | |
1789 | } | |
1790 | ||
20f37034 HC |
1791 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1792 | int __user *, upeer_addrlen) | |
aaca0bdc | 1793 | { |
4541e805 | 1794 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
aaca0bdc UD |
1795 | } |
1796 | ||
1da177e4 LT |
1797 | /* |
1798 | * Attempt to connect to a socket with the server address. The address | |
1799 | * is in user space so we verify it is OK and move it to kernel space. | |
1800 | * | |
1801 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1802 | * break bindings | |
1803 | * | |
1804 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1805 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1806 | * include the -EINPROGRESS status for such sockets. | |
1807 | */ | |
1808 | ||
1387c2c2 | 1809 | int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) |
1da177e4 LT |
1810 | { |
1811 | struct socket *sock; | |
230b1839 | 1812 | struct sockaddr_storage address; |
6cb153ca | 1813 | int err, fput_needed; |
1da177e4 | 1814 | |
6cb153ca | 1815 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1816 | if (!sock) |
1817 | goto out; | |
43db362d | 1818 | err = move_addr_to_kernel(uservaddr, addrlen, &address); |
1da177e4 LT |
1819 | if (err < 0) |
1820 | goto out_put; | |
1821 | ||
89bddce5 | 1822 | err = |
230b1839 | 1823 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); |
1da177e4 LT |
1824 | if (err) |
1825 | goto out_put; | |
1826 | ||
230b1839 | 1827 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, |
1da177e4 LT |
1828 | sock->file->f_flags); |
1829 | out_put: | |
6cb153ca | 1830 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1831 | out: |
1832 | return err; | |
1833 | } | |
1834 | ||
1387c2c2 DB |
1835 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
1836 | int, addrlen) | |
1837 | { | |
1838 | return __sys_connect(fd, uservaddr, addrlen); | |
1839 | } | |
1840 | ||
1da177e4 LT |
1841 | /* |
1842 | * Get the local address ('name') of a socket object. Move the obtained | |
1843 | * name to user space. | |
1844 | */ | |
1845 | ||
8882a107 DB |
1846 | int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1847 | int __user *usockaddr_len) | |
1da177e4 LT |
1848 | { |
1849 | struct socket *sock; | |
230b1839 | 1850 | struct sockaddr_storage address; |
9b2c45d4 | 1851 | int err, fput_needed; |
89bddce5 | 1852 | |
6cb153ca | 1853 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1854 | if (!sock) |
1855 | goto out; | |
1856 | ||
1857 | err = security_socket_getsockname(sock); | |
1858 | if (err) | |
1859 | goto out_put; | |
1860 | ||
9b2c45d4 DV |
1861 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); |
1862 | if (err < 0) | |
1da177e4 | 1863 | goto out_put; |
9b2c45d4 DV |
1864 | /* "err" is actually length in this case */ |
1865 | err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); | |
1da177e4 LT |
1866 | |
1867 | out_put: | |
6cb153ca | 1868 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1869 | out: |
1870 | return err; | |
1871 | } | |
1872 | ||
8882a107 DB |
1873 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
1874 | int __user *, usockaddr_len) | |
1875 | { | |
1876 | return __sys_getsockname(fd, usockaddr, usockaddr_len); | |
1877 | } | |
1878 | ||
1da177e4 LT |
1879 | /* |
1880 | * Get the remote address ('name') of a socket object. Move the obtained | |
1881 | * name to user space. | |
1882 | */ | |
1883 | ||
b21c8f83 DB |
1884 | int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1885 | int __user *usockaddr_len) | |
1da177e4 LT |
1886 | { |
1887 | struct socket *sock; | |
230b1839 | 1888 | struct sockaddr_storage address; |
9b2c45d4 | 1889 | int err, fput_needed; |
1da177e4 | 1890 | |
89bddce5 SH |
1891 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1892 | if (sock != NULL) { | |
1da177e4 LT |
1893 | err = security_socket_getpeername(sock); |
1894 | if (err) { | |
6cb153ca | 1895 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1896 | return err; |
1897 | } | |
1898 | ||
9b2c45d4 DV |
1899 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); |
1900 | if (err >= 0) | |
1901 | /* "err" is actually length in this case */ | |
1902 | err = move_addr_to_user(&address, err, usockaddr, | |
89bddce5 | 1903 | usockaddr_len); |
6cb153ca | 1904 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1905 | } |
1906 | return err; | |
1907 | } | |
1908 | ||
b21c8f83 DB |
1909 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
1910 | int __user *, usockaddr_len) | |
1911 | { | |
1912 | return __sys_getpeername(fd, usockaddr, usockaddr_len); | |
1913 | } | |
1914 | ||
1da177e4 LT |
1915 | /* |
1916 | * Send a datagram to a given address. We move the address into kernel | |
1917 | * space and check the user space data area is readable before invoking | |
1918 | * the protocol. | |
1919 | */ | |
211b634b DB |
1920 | int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, |
1921 | struct sockaddr __user *addr, int addr_len) | |
1da177e4 LT |
1922 | { |
1923 | struct socket *sock; | |
230b1839 | 1924 | struct sockaddr_storage address; |
1da177e4 LT |
1925 | int err; |
1926 | struct msghdr msg; | |
1927 | struct iovec iov; | |
6cb153ca | 1928 | int fput_needed; |
6cb153ca | 1929 | |
602bd0e9 AV |
1930 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); |
1931 | if (unlikely(err)) | |
1932 | return err; | |
de0fa95c PE |
1933 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1934 | if (!sock) | |
4387ff75 | 1935 | goto out; |
6cb153ca | 1936 | |
89bddce5 | 1937 | msg.msg_name = NULL; |
89bddce5 SH |
1938 | msg.msg_control = NULL; |
1939 | msg.msg_controllen = 0; | |
1940 | msg.msg_namelen = 0; | |
6cb153ca | 1941 | if (addr) { |
43db362d | 1942 | err = move_addr_to_kernel(addr, addr_len, &address); |
1da177e4 LT |
1943 | if (err < 0) |
1944 | goto out_put; | |
230b1839 | 1945 | msg.msg_name = (struct sockaddr *)&address; |
89bddce5 | 1946 | msg.msg_namelen = addr_len; |
1da177e4 LT |
1947 | } |
1948 | if (sock->file->f_flags & O_NONBLOCK) | |
1949 | flags |= MSG_DONTWAIT; | |
1950 | msg.msg_flags = flags; | |
d8725c86 | 1951 | err = sock_sendmsg(sock, &msg); |
1da177e4 | 1952 | |
89bddce5 | 1953 | out_put: |
de0fa95c | 1954 | fput_light(sock->file, fput_needed); |
4387ff75 | 1955 | out: |
1da177e4 LT |
1956 | return err; |
1957 | } | |
1958 | ||
211b634b DB |
1959 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
1960 | unsigned int, flags, struct sockaddr __user *, addr, | |
1961 | int, addr_len) | |
1962 | { | |
1963 | return __sys_sendto(fd, buff, len, flags, addr, addr_len); | |
1964 | } | |
1965 | ||
1da177e4 | 1966 | /* |
89bddce5 | 1967 | * Send a datagram down a socket. |
1da177e4 LT |
1968 | */ |
1969 | ||
3e0fa65f | 1970 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
95c96174 | 1971 | unsigned int, flags) |
1da177e4 | 1972 | { |
211b634b | 1973 | return __sys_sendto(fd, buff, len, flags, NULL, 0); |
1da177e4 LT |
1974 | } |
1975 | ||
1976 | /* | |
89bddce5 | 1977 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
1978 | * sender. We verify the buffers are writable and if needed move the |
1979 | * sender address from kernel to user space. | |
1980 | */ | |
7a09e1eb DB |
1981 | int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, |
1982 | struct sockaddr __user *addr, int __user *addr_len) | |
1da177e4 LT |
1983 | { |
1984 | struct socket *sock; | |
1985 | struct iovec iov; | |
1986 | struct msghdr msg; | |
230b1839 | 1987 | struct sockaddr_storage address; |
89bddce5 | 1988 | int err, err2; |
6cb153ca BL |
1989 | int fput_needed; |
1990 | ||
602bd0e9 AV |
1991 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); |
1992 | if (unlikely(err)) | |
1993 | return err; | |
de0fa95c | 1994 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 1995 | if (!sock) |
de0fa95c | 1996 | goto out; |
1da177e4 | 1997 | |
89bddce5 SH |
1998 | msg.msg_control = NULL; |
1999 | msg.msg_controllen = 0; | |
f3d33426 HFS |
2000 | /* Save some cycles and don't copy the address if not needed */ |
2001 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; | |
2002 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
2003 | msg.msg_namelen = 0; | |
130ed5d1 | 2004 | msg.msg_iocb = NULL; |
9f138fa6 | 2005 | msg.msg_flags = 0; |
1da177e4 LT |
2006 | if (sock->file->f_flags & O_NONBLOCK) |
2007 | flags |= MSG_DONTWAIT; | |
2da62906 | 2008 | err = sock_recvmsg(sock, &msg, flags); |
1da177e4 | 2009 | |
89bddce5 | 2010 | if (err >= 0 && addr != NULL) { |
43db362d | 2011 | err2 = move_addr_to_user(&address, |
230b1839 | 2012 | msg.msg_namelen, addr, addr_len); |
89bddce5 SH |
2013 | if (err2 < 0) |
2014 | err = err2; | |
1da177e4 | 2015 | } |
de0fa95c PE |
2016 | |
2017 | fput_light(sock->file, fput_needed); | |
4387ff75 | 2018 | out: |
1da177e4 LT |
2019 | return err; |
2020 | } | |
2021 | ||
7a09e1eb DB |
2022 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
2023 | unsigned int, flags, struct sockaddr __user *, addr, | |
2024 | int __user *, addr_len) | |
2025 | { | |
2026 | return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); | |
2027 | } | |
2028 | ||
1da177e4 | 2029 | /* |
89bddce5 | 2030 | * Receive a datagram from a socket. |
1da177e4 LT |
2031 | */ |
2032 | ||
b7c0ddf5 JG |
2033 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, |
2034 | unsigned int, flags) | |
1da177e4 | 2035 | { |
7a09e1eb | 2036 | return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1da177e4 LT |
2037 | } |
2038 | ||
2039 | /* | |
2040 | * Set a socket option. Because we don't know the option lengths we have | |
2041 | * to pass the user mode parameter for the protocols to sort out. | |
2042 | */ | |
2043 | ||
cc36dca0 DB |
2044 | static int __sys_setsockopt(int fd, int level, int optname, |
2045 | char __user *optval, int optlen) | |
1da177e4 | 2046 | { |
6cb153ca | 2047 | int err, fput_needed; |
1da177e4 LT |
2048 | struct socket *sock; |
2049 | ||
2050 | if (optlen < 0) | |
2051 | return -EINVAL; | |
89bddce5 SH |
2052 | |
2053 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2054 | if (sock != NULL) { | |
2055 | err = security_socket_setsockopt(sock, level, optname); | |
6cb153ca BL |
2056 | if (err) |
2057 | goto out_put; | |
1da177e4 LT |
2058 | |
2059 | if (level == SOL_SOCKET) | |
89bddce5 SH |
2060 | err = |
2061 | sock_setsockopt(sock, level, optname, optval, | |
2062 | optlen); | |
1da177e4 | 2063 | else |
89bddce5 SH |
2064 | err = |
2065 | sock->ops->setsockopt(sock, level, optname, optval, | |
2066 | optlen); | |
6cb153ca BL |
2067 | out_put: |
2068 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2069 | } |
2070 | return err; | |
2071 | } | |
2072 | ||
cc36dca0 DB |
2073 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
2074 | char __user *, optval, int, optlen) | |
2075 | { | |
2076 | return __sys_setsockopt(fd, level, optname, optval, optlen); | |
2077 | } | |
2078 | ||
1da177e4 LT |
2079 | /* |
2080 | * Get a socket option. Because we don't know the option lengths we have | |
2081 | * to pass a user mode parameter for the protocols to sort out. | |
2082 | */ | |
2083 | ||
13a2d70e DB |
2084 | static int __sys_getsockopt(int fd, int level, int optname, |
2085 | char __user *optval, int __user *optlen) | |
1da177e4 | 2086 | { |
6cb153ca | 2087 | int err, fput_needed; |
1da177e4 LT |
2088 | struct socket *sock; |
2089 | ||
89bddce5 SH |
2090 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2091 | if (sock != NULL) { | |
6cb153ca BL |
2092 | err = security_socket_getsockopt(sock, level, optname); |
2093 | if (err) | |
2094 | goto out_put; | |
1da177e4 LT |
2095 | |
2096 | if (level == SOL_SOCKET) | |
89bddce5 SH |
2097 | err = |
2098 | sock_getsockopt(sock, level, optname, optval, | |
2099 | optlen); | |
1da177e4 | 2100 | else |
89bddce5 SH |
2101 | err = |
2102 | sock->ops->getsockopt(sock, level, optname, optval, | |
2103 | optlen); | |
6cb153ca BL |
2104 | out_put: |
2105 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2106 | } |
2107 | return err; | |
2108 | } | |
2109 | ||
13a2d70e DB |
2110 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
2111 | char __user *, optval, int __user *, optlen) | |
2112 | { | |
2113 | return __sys_getsockopt(fd, level, optname, optval, optlen); | |
2114 | } | |
2115 | ||
1da177e4 LT |
2116 | /* |
2117 | * Shutdown a socket. | |
2118 | */ | |
2119 | ||
005a1aea | 2120 | int __sys_shutdown(int fd, int how) |
1da177e4 | 2121 | { |
6cb153ca | 2122 | int err, fput_needed; |
1da177e4 LT |
2123 | struct socket *sock; |
2124 | ||
89bddce5 SH |
2125 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2126 | if (sock != NULL) { | |
1da177e4 | 2127 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
2128 | if (!err) |
2129 | err = sock->ops->shutdown(sock, how); | |
2130 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2131 | } |
2132 | return err; | |
2133 | } | |
2134 | ||
005a1aea DB |
2135 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
2136 | { | |
2137 | return __sys_shutdown(fd, how); | |
2138 | } | |
2139 | ||
89bddce5 | 2140 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
2141 | * fields which are the same type (int / unsigned) on our platforms. |
2142 | */ | |
2143 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
2144 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
2145 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
2146 | ||
c71d8ebe TH |
2147 | struct used_address { |
2148 | struct sockaddr_storage name; | |
2149 | unsigned int name_len; | |
2150 | }; | |
2151 | ||
da184284 AV |
2152 | static int copy_msghdr_from_user(struct msghdr *kmsg, |
2153 | struct user_msghdr __user *umsg, | |
2154 | struct sockaddr __user **save_addr, | |
2155 | struct iovec **iov) | |
1661bf36 | 2156 | { |
ffb07550 | 2157 | struct user_msghdr msg; |
08adb7da AV |
2158 | ssize_t err; |
2159 | ||
ffb07550 | 2160 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) |
1661bf36 | 2161 | return -EFAULT; |
dbb490b9 | 2162 | |
864d9664 | 2163 | kmsg->msg_control = (void __force *)msg.msg_control; |
ffb07550 AV |
2164 | kmsg->msg_controllen = msg.msg_controllen; |
2165 | kmsg->msg_flags = msg.msg_flags; | |
2166 | ||
2167 | kmsg->msg_namelen = msg.msg_namelen; | |
2168 | if (!msg.msg_name) | |
6a2a2b3a AS |
2169 | kmsg->msg_namelen = 0; |
2170 | ||
dbb490b9 ML |
2171 | if (kmsg->msg_namelen < 0) |
2172 | return -EINVAL; | |
2173 | ||
1661bf36 | 2174 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
db31c55a | 2175 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); |
08adb7da AV |
2176 | |
2177 | if (save_addr) | |
ffb07550 | 2178 | *save_addr = msg.msg_name; |
08adb7da | 2179 | |
ffb07550 | 2180 | if (msg.msg_name && kmsg->msg_namelen) { |
08adb7da | 2181 | if (!save_addr) { |
864d9664 PA |
2182 | err = move_addr_to_kernel(msg.msg_name, |
2183 | kmsg->msg_namelen, | |
08adb7da AV |
2184 | kmsg->msg_name); |
2185 | if (err < 0) | |
2186 | return err; | |
2187 | } | |
2188 | } else { | |
2189 | kmsg->msg_name = NULL; | |
2190 | kmsg->msg_namelen = 0; | |
2191 | } | |
2192 | ||
ffb07550 | 2193 | if (msg.msg_iovlen > UIO_MAXIOV) |
08adb7da AV |
2194 | return -EMSGSIZE; |
2195 | ||
0345f931 | 2196 | kmsg->msg_iocb = NULL; |
2197 | ||
ffb07550 AV |
2198 | return import_iovec(save_addr ? READ : WRITE, |
2199 | msg.msg_iov, msg.msg_iovlen, | |
da184284 | 2200 | UIO_FASTIOV, iov, &kmsg->msg_iter); |
1661bf36 DC |
2201 | } |
2202 | ||
666547ff | 2203 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, |
95c96174 | 2204 | struct msghdr *msg_sys, unsigned int flags, |
28a94d8f TH |
2205 | struct used_address *used_address, |
2206 | unsigned int allowed_msghdr_flags) | |
1da177e4 | 2207 | { |
89bddce5 SH |
2208 | struct compat_msghdr __user *msg_compat = |
2209 | (struct compat_msghdr __user *)msg; | |
230b1839 | 2210 | struct sockaddr_storage address; |
1da177e4 | 2211 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
b9d717a7 | 2212 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
846cc123 | 2213 | __aligned(sizeof(__kernel_size_t)); |
89bddce5 | 2214 | /* 20 is size of ipv6_pktinfo */ |
1da177e4 | 2215 | unsigned char *ctl_buf = ctl; |
d8725c86 | 2216 | int ctl_len; |
08adb7da | 2217 | ssize_t err; |
89bddce5 | 2218 | |
08adb7da | 2219 | msg_sys->msg_name = &address; |
1da177e4 | 2220 | |
08449320 | 2221 | if (MSG_CMSG_COMPAT & flags) |
08adb7da | 2222 | err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); |
08449320 | 2223 | else |
08adb7da | 2224 | err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); |
89bddce5 | 2225 | if (err < 0) |
da184284 | 2226 | return err; |
1da177e4 LT |
2227 | |
2228 | err = -ENOBUFS; | |
2229 | ||
228e548e | 2230 | if (msg_sys->msg_controllen > INT_MAX) |
1da177e4 | 2231 | goto out_freeiov; |
28a94d8f | 2232 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); |
228e548e | 2233 | ctl_len = msg_sys->msg_controllen; |
1da177e4 | 2234 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 | 2235 | err = |
228e548e | 2236 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
89bddce5 | 2237 | sizeof(ctl)); |
1da177e4 LT |
2238 | if (err) |
2239 | goto out_freeiov; | |
228e548e AB |
2240 | ctl_buf = msg_sys->msg_control; |
2241 | ctl_len = msg_sys->msg_controllen; | |
1da177e4 | 2242 | } else if (ctl_len) { |
ac4340fc DM |
2243 | BUILD_BUG_ON(sizeof(struct cmsghdr) != |
2244 | CMSG_ALIGN(sizeof(struct cmsghdr))); | |
89bddce5 | 2245 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 2246 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 2247 | if (ctl_buf == NULL) |
1da177e4 LT |
2248 | goto out_freeiov; |
2249 | } | |
2250 | err = -EFAULT; | |
2251 | /* | |
228e548e | 2252 | * Careful! Before this, msg_sys->msg_control contains a user pointer. |
1da177e4 LT |
2253 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted |
2254 | * checking falls down on this. | |
2255 | */ | |
fb8621bb | 2256 | if (copy_from_user(ctl_buf, |
228e548e | 2257 | (void __user __force *)msg_sys->msg_control, |
89bddce5 | 2258 | ctl_len)) |
1da177e4 | 2259 | goto out_freectl; |
228e548e | 2260 | msg_sys->msg_control = ctl_buf; |
1da177e4 | 2261 | } |
228e548e | 2262 | msg_sys->msg_flags = flags; |
1da177e4 LT |
2263 | |
2264 | if (sock->file->f_flags & O_NONBLOCK) | |
228e548e | 2265 | msg_sys->msg_flags |= MSG_DONTWAIT; |
c71d8ebe TH |
2266 | /* |
2267 | * If this is sendmmsg() and current destination address is same as | |
2268 | * previously succeeded address, omit asking LSM's decision. | |
2269 | * used_address->name_len is initialized to UINT_MAX so that the first | |
2270 | * destination address never matches. | |
2271 | */ | |
bc909d9d MD |
2272 | if (used_address && msg_sys->msg_name && |
2273 | used_address->name_len == msg_sys->msg_namelen && | |
2274 | !memcmp(&used_address->name, msg_sys->msg_name, | |
c71d8ebe | 2275 | used_address->name_len)) { |
d8725c86 | 2276 | err = sock_sendmsg_nosec(sock, msg_sys); |
c71d8ebe TH |
2277 | goto out_freectl; |
2278 | } | |
d8725c86 | 2279 | err = sock_sendmsg(sock, msg_sys); |
c71d8ebe TH |
2280 | /* |
2281 | * If this is sendmmsg() and sending to current destination address was | |
2282 | * successful, remember it. | |
2283 | */ | |
2284 | if (used_address && err >= 0) { | |
2285 | used_address->name_len = msg_sys->msg_namelen; | |
bc909d9d MD |
2286 | if (msg_sys->msg_name) |
2287 | memcpy(&used_address->name, msg_sys->msg_name, | |
2288 | used_address->name_len); | |
c71d8ebe | 2289 | } |
1da177e4 LT |
2290 | |
2291 | out_freectl: | |
89bddce5 | 2292 | if (ctl_buf != ctl) |
1da177e4 LT |
2293 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
2294 | out_freeiov: | |
da184284 | 2295 | kfree(iov); |
228e548e AB |
2296 | return err; |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * BSD sendmsg interface | |
2301 | */ | |
2302 | ||
e1834a32 DB |
2303 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2304 | bool forbid_cmsg_compat) | |
228e548e AB |
2305 | { |
2306 | int fput_needed, err; | |
2307 | struct msghdr msg_sys; | |
1be374a0 AL |
2308 | struct socket *sock; |
2309 | ||
e1834a32 DB |
2310 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2311 | return -EINVAL; | |
2312 | ||
1be374a0 | 2313 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
228e548e AB |
2314 | if (!sock) |
2315 | goto out; | |
2316 | ||
28a94d8f | 2317 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); |
228e548e | 2318 | |
6cb153ca | 2319 | fput_light(sock->file, fput_needed); |
89bddce5 | 2320 | out: |
1da177e4 LT |
2321 | return err; |
2322 | } | |
2323 | ||
666547ff | 2324 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) |
a7526eb5 | 2325 | { |
e1834a32 | 2326 | return __sys_sendmsg(fd, msg, flags, true); |
a7526eb5 AL |
2327 | } |
2328 | ||
228e548e AB |
2329 | /* |
2330 | * Linux sendmmsg interface | |
2331 | */ | |
2332 | ||
2333 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
e1834a32 | 2334 | unsigned int flags, bool forbid_cmsg_compat) |
228e548e AB |
2335 | { |
2336 | int fput_needed, err, datagrams; | |
2337 | struct socket *sock; | |
2338 | struct mmsghdr __user *entry; | |
2339 | struct compat_mmsghdr __user *compat_entry; | |
2340 | struct msghdr msg_sys; | |
c71d8ebe | 2341 | struct used_address used_address; |
f092276d | 2342 | unsigned int oflags = flags; |
228e548e | 2343 | |
e1834a32 DB |
2344 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2345 | return -EINVAL; | |
2346 | ||
98382f41 AB |
2347 | if (vlen > UIO_MAXIOV) |
2348 | vlen = UIO_MAXIOV; | |
228e548e AB |
2349 | |
2350 | datagrams = 0; | |
2351 | ||
2352 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2353 | if (!sock) | |
2354 | return err; | |
2355 | ||
c71d8ebe | 2356 | used_address.name_len = UINT_MAX; |
228e548e AB |
2357 | entry = mmsg; |
2358 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
728ffb86 | 2359 | err = 0; |
f092276d | 2360 | flags |= MSG_BATCH; |
228e548e AB |
2361 | |
2362 | while (datagrams < vlen) { | |
f092276d TH |
2363 | if (datagrams == vlen - 1) |
2364 | flags = oflags; | |
2365 | ||
228e548e | 2366 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2367 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, |
28a94d8f | 2368 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2369 | if (err < 0) |
2370 | break; | |
2371 | err = __put_user(err, &compat_entry->msg_len); | |
2372 | ++compat_entry; | |
2373 | } else { | |
a7526eb5 | 2374 | err = ___sys_sendmsg(sock, |
666547ff | 2375 | (struct user_msghdr __user *)entry, |
28a94d8f | 2376 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2377 | if (err < 0) |
2378 | break; | |
2379 | err = put_user(err, &entry->msg_len); | |
2380 | ++entry; | |
2381 | } | |
2382 | ||
2383 | if (err) | |
2384 | break; | |
2385 | ++datagrams; | |
3023898b SHY |
2386 | if (msg_data_left(&msg_sys)) |
2387 | break; | |
a78cb84c | 2388 | cond_resched(); |
228e548e AB |
2389 | } |
2390 | ||
228e548e AB |
2391 | fput_light(sock->file, fput_needed); |
2392 | ||
728ffb86 AB |
2393 | /* We only return an error if no datagrams were able to be sent */ |
2394 | if (datagrams != 0) | |
228e548e AB |
2395 | return datagrams; |
2396 | ||
228e548e AB |
2397 | return err; |
2398 | } | |
2399 | ||
2400 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2401 | unsigned int, vlen, unsigned int, flags) | |
2402 | { | |
e1834a32 | 2403 | return __sys_sendmmsg(fd, mmsg, vlen, flags, true); |
228e548e AB |
2404 | } |
2405 | ||
666547ff | 2406 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, |
95c96174 | 2407 | struct msghdr *msg_sys, unsigned int flags, int nosec) |
1da177e4 | 2408 | { |
89bddce5 SH |
2409 | struct compat_msghdr __user *msg_compat = |
2410 | (struct compat_msghdr __user *)msg; | |
1da177e4 | 2411 | struct iovec iovstack[UIO_FASTIOV]; |
89bddce5 | 2412 | struct iovec *iov = iovstack; |
1da177e4 | 2413 | unsigned long cmsg_ptr; |
2da62906 | 2414 | int len; |
08adb7da | 2415 | ssize_t err; |
1da177e4 LT |
2416 | |
2417 | /* kernel mode address */ | |
230b1839 | 2418 | struct sockaddr_storage addr; |
1da177e4 LT |
2419 | |
2420 | /* user mode address pointers */ | |
2421 | struct sockaddr __user *uaddr; | |
08adb7da | 2422 | int __user *uaddr_len = COMPAT_NAMELEN(msg); |
89bddce5 | 2423 | |
08adb7da | 2424 | msg_sys->msg_name = &addr; |
1da177e4 | 2425 | |
f3d33426 | 2426 | if (MSG_CMSG_COMPAT & flags) |
08adb7da | 2427 | err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); |
f3d33426 | 2428 | else |
08adb7da | 2429 | err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); |
1da177e4 | 2430 | if (err < 0) |
da184284 | 2431 | return err; |
1da177e4 | 2432 | |
a2e27255 ACM |
2433 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
2434 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
89bddce5 | 2435 | |
f3d33426 HFS |
2436 | /* We assume all kernel code knows the size of sockaddr_storage */ |
2437 | msg_sys->msg_namelen = 0; | |
2438 | ||
1da177e4 LT |
2439 | if (sock->file->f_flags & O_NONBLOCK) |
2440 | flags |= MSG_DONTWAIT; | |
2da62906 | 2441 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); |
1da177e4 LT |
2442 | if (err < 0) |
2443 | goto out_freeiov; | |
2444 | len = err; | |
2445 | ||
2446 | if (uaddr != NULL) { | |
43db362d | 2447 | err = move_addr_to_user(&addr, |
a2e27255 | 2448 | msg_sys->msg_namelen, uaddr, |
89bddce5 | 2449 | uaddr_len); |
1da177e4 LT |
2450 | if (err < 0) |
2451 | goto out_freeiov; | |
2452 | } | |
a2e27255 | 2453 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
37f7f421 | 2454 | COMPAT_FLAGS(msg)); |
1da177e4 LT |
2455 | if (err) |
2456 | goto out_freeiov; | |
2457 | if (MSG_CMSG_COMPAT & flags) | |
a2e27255 | 2458 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2459 | &msg_compat->msg_controllen); |
2460 | else | |
a2e27255 | 2461 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2462 | &msg->msg_controllen); |
2463 | if (err) | |
2464 | goto out_freeiov; | |
2465 | err = len; | |
2466 | ||
2467 | out_freeiov: | |
da184284 | 2468 | kfree(iov); |
a2e27255 ACM |
2469 | return err; |
2470 | } | |
2471 | ||
2472 | /* | |
2473 | * BSD recvmsg interface | |
2474 | */ | |
2475 | ||
e1834a32 DB |
2476 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2477 | bool forbid_cmsg_compat) | |
a2e27255 ACM |
2478 | { |
2479 | int fput_needed, err; | |
2480 | struct msghdr msg_sys; | |
1be374a0 AL |
2481 | struct socket *sock; |
2482 | ||
e1834a32 DB |
2483 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2484 | return -EINVAL; | |
2485 | ||
1be374a0 | 2486 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
a2e27255 ACM |
2487 | if (!sock) |
2488 | goto out; | |
2489 | ||
a7526eb5 | 2490 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
a2e27255 | 2491 | |
6cb153ca | 2492 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2493 | out: |
2494 | return err; | |
2495 | } | |
2496 | ||
666547ff | 2497 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, |
a7526eb5 AL |
2498 | unsigned int, flags) |
2499 | { | |
e1834a32 | 2500 | return __sys_recvmsg(fd, msg, flags, true); |
a7526eb5 AL |
2501 | } |
2502 | ||
a2e27255 ACM |
2503 | /* |
2504 | * Linux recvmmsg interface | |
2505 | */ | |
2506 | ||
e11d4284 AB |
2507 | static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2508 | unsigned int vlen, unsigned int flags, | |
2509 | struct timespec64 *timeout) | |
a2e27255 ACM |
2510 | { |
2511 | int fput_needed, err, datagrams; | |
2512 | struct socket *sock; | |
2513 | struct mmsghdr __user *entry; | |
d7256d0e | 2514 | struct compat_mmsghdr __user *compat_entry; |
a2e27255 | 2515 | struct msghdr msg_sys; |
766b9f92 DD |
2516 | struct timespec64 end_time; |
2517 | struct timespec64 timeout64; | |
a2e27255 ACM |
2518 | |
2519 | if (timeout && | |
2520 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2521 | timeout->tv_nsec)) | |
2522 | return -EINVAL; | |
2523 | ||
2524 | datagrams = 0; | |
2525 | ||
2526 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2527 | if (!sock) | |
2528 | return err; | |
2529 | ||
7797dc41 SHY |
2530 | if (likely(!(flags & MSG_ERRQUEUE))) { |
2531 | err = sock_error(sock->sk); | |
2532 | if (err) { | |
2533 | datagrams = err; | |
2534 | goto out_put; | |
2535 | } | |
e623a9e9 | 2536 | } |
a2e27255 ACM |
2537 | |
2538 | entry = mmsg; | |
d7256d0e | 2539 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
a2e27255 ACM |
2540 | |
2541 | while (datagrams < vlen) { | |
2542 | /* | |
2543 | * No need to ask LSM for more than the first datagram. | |
2544 | */ | |
d7256d0e | 2545 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2546 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, |
a7526eb5 AL |
2547 | &msg_sys, flags & ~MSG_WAITFORONE, |
2548 | datagrams); | |
d7256d0e JMG |
2549 | if (err < 0) |
2550 | break; | |
2551 | err = __put_user(err, &compat_entry->msg_len); | |
2552 | ++compat_entry; | |
2553 | } else { | |
a7526eb5 | 2554 | err = ___sys_recvmsg(sock, |
666547ff | 2555 | (struct user_msghdr __user *)entry, |
a7526eb5 AL |
2556 | &msg_sys, flags & ~MSG_WAITFORONE, |
2557 | datagrams); | |
d7256d0e JMG |
2558 | if (err < 0) |
2559 | break; | |
2560 | err = put_user(err, &entry->msg_len); | |
2561 | ++entry; | |
2562 | } | |
2563 | ||
a2e27255 ACM |
2564 | if (err) |
2565 | break; | |
a2e27255 ACM |
2566 | ++datagrams; |
2567 | ||
71c5c159 BB |
2568 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
2569 | if (flags & MSG_WAITFORONE) | |
2570 | flags |= MSG_DONTWAIT; | |
2571 | ||
a2e27255 | 2572 | if (timeout) { |
766b9f92 | 2573 | ktime_get_ts64(&timeout64); |
c2e6c856 | 2574 | *timeout = timespec64_sub(end_time, timeout64); |
a2e27255 ACM |
2575 | if (timeout->tv_sec < 0) { |
2576 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2577 | break; | |
2578 | } | |
2579 | ||
2580 | /* Timeout, return less than vlen datagrams */ | |
2581 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2582 | break; | |
2583 | } | |
2584 | ||
2585 | /* Out of band data, return right away */ | |
2586 | if (msg_sys.msg_flags & MSG_OOB) | |
2587 | break; | |
a78cb84c | 2588 | cond_resched(); |
a2e27255 ACM |
2589 | } |
2590 | ||
a2e27255 | 2591 | if (err == 0) |
34b88a68 ACM |
2592 | goto out_put; |
2593 | ||
2594 | if (datagrams == 0) { | |
2595 | datagrams = err; | |
2596 | goto out_put; | |
2597 | } | |
a2e27255 | 2598 | |
34b88a68 ACM |
2599 | /* |
2600 | * We may return less entries than requested (vlen) if the | |
2601 | * sock is non block and there aren't enough datagrams... | |
2602 | */ | |
2603 | if (err != -EAGAIN) { | |
a2e27255 | 2604 | /* |
34b88a68 ACM |
2605 | * ... or if recvmsg returns an error after we |
2606 | * received some datagrams, where we record the | |
2607 | * error to return on the next call or if the | |
2608 | * app asks about it using getsockopt(SO_ERROR). | |
a2e27255 | 2609 | */ |
34b88a68 | 2610 | sock->sk->sk_err = -err; |
a2e27255 | 2611 | } |
34b88a68 ACM |
2612 | out_put: |
2613 | fput_light(sock->file, fput_needed); | |
a2e27255 | 2614 | |
34b88a68 | 2615 | return datagrams; |
a2e27255 ACM |
2616 | } |
2617 | ||
e11d4284 AB |
2618 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2619 | unsigned int vlen, unsigned int flags, | |
2620 | struct __kernel_timespec __user *timeout, | |
2621 | struct old_timespec32 __user *timeout32) | |
a2e27255 ACM |
2622 | { |
2623 | int datagrams; | |
c2e6c856 | 2624 | struct timespec64 timeout_sys; |
a2e27255 | 2625 | |
e11d4284 AB |
2626 | if (timeout && get_timespec64(&timeout_sys, timeout)) |
2627 | return -EFAULT; | |
a2e27255 | 2628 | |
e11d4284 | 2629 | if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) |
a2e27255 ACM |
2630 | return -EFAULT; |
2631 | ||
e11d4284 AB |
2632 | if (!timeout && !timeout32) |
2633 | return do_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2634 | ||
2635 | datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
a2e27255 | 2636 | |
e11d4284 AB |
2637 | if (datagrams <= 0) |
2638 | return datagrams; | |
2639 | ||
2640 | if (timeout && put_timespec64(&timeout_sys, timeout)) | |
2641 | datagrams = -EFAULT; | |
2642 | ||
2643 | if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) | |
a2e27255 ACM |
2644 | datagrams = -EFAULT; |
2645 | ||
2646 | return datagrams; | |
2647 | } | |
2648 | ||
1255e269 DB |
2649 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2650 | unsigned int, vlen, unsigned int, flags, | |
c2e6c856 | 2651 | struct __kernel_timespec __user *, timeout) |
1255e269 | 2652 | { |
e11d4284 AB |
2653 | if (flags & MSG_CMSG_COMPAT) |
2654 | return -EINVAL; | |
2655 | ||
2656 | return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); | |
2657 | } | |
2658 | ||
2659 | #ifdef CONFIG_COMPAT_32BIT_TIME | |
2660 | SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, | |
2661 | unsigned int, vlen, unsigned int, flags, | |
2662 | struct old_timespec32 __user *, timeout) | |
2663 | { | |
2664 | if (flags & MSG_CMSG_COMPAT) | |
2665 | return -EINVAL; | |
2666 | ||
2667 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); | |
1255e269 | 2668 | } |
e11d4284 | 2669 | #endif |
1255e269 | 2670 | |
a2e27255 | 2671 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
1da177e4 LT |
2672 | /* Argument list sizes for sys_socketcall */ |
2673 | #define AL(x) ((x) * sizeof(unsigned long)) | |
228e548e | 2674 | static const unsigned char nargs[21] = { |
c6d409cf ED |
2675 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
2676 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2677 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
228e548e | 2678 | AL(4), AL(5), AL(4) |
89bddce5 SH |
2679 | }; |
2680 | ||
1da177e4 LT |
2681 | #undef AL |
2682 | ||
2683 | /* | |
89bddce5 | 2684 | * System call vectors. |
1da177e4 LT |
2685 | * |
2686 | * Argument checking cleaned up. Saved 20% in size. | |
2687 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 2688 | * it is set by the callees. |
1da177e4 LT |
2689 | */ |
2690 | ||
3e0fa65f | 2691 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
1da177e4 | 2692 | { |
2950fa9d | 2693 | unsigned long a[AUDITSC_ARGS]; |
89bddce5 | 2694 | unsigned long a0, a1; |
1da177e4 | 2695 | int err; |
47379052 | 2696 | unsigned int len; |
1da177e4 | 2697 | |
228e548e | 2698 | if (call < 1 || call > SYS_SENDMMSG) |
1da177e4 | 2699 | return -EINVAL; |
c8e8cd57 | 2700 | call = array_index_nospec(call, SYS_SENDMMSG + 1); |
1da177e4 | 2701 | |
47379052 AV |
2702 | len = nargs[call]; |
2703 | if (len > sizeof(a)) | |
2704 | return -EINVAL; | |
2705 | ||
1da177e4 | 2706 | /* copy_from_user should be SMP safe. */ |
47379052 | 2707 | if (copy_from_user(a, args, len)) |
1da177e4 | 2708 | return -EFAULT; |
3ec3b2fb | 2709 | |
2950fa9d CG |
2710 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
2711 | if (err) | |
2712 | return err; | |
3ec3b2fb | 2713 | |
89bddce5 SH |
2714 | a0 = a[0]; |
2715 | a1 = a[1]; | |
2716 | ||
2717 | switch (call) { | |
2718 | case SYS_SOCKET: | |
9d6a15c3 | 2719 | err = __sys_socket(a0, a1, a[2]); |
89bddce5 SH |
2720 | break; |
2721 | case SYS_BIND: | |
a87d35d8 | 2722 | err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
2723 | break; |
2724 | case SYS_CONNECT: | |
1387c2c2 | 2725 | err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
2726 | break; |
2727 | case SYS_LISTEN: | |
25e290ee | 2728 | err = __sys_listen(a0, a1); |
89bddce5 SH |
2729 | break; |
2730 | case SYS_ACCEPT: | |
4541e805 DB |
2731 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
2732 | (int __user *)a[2], 0); | |
89bddce5 SH |
2733 | break; |
2734 | case SYS_GETSOCKNAME: | |
2735 | err = | |
8882a107 DB |
2736 | __sys_getsockname(a0, (struct sockaddr __user *)a1, |
2737 | (int __user *)a[2]); | |
89bddce5 SH |
2738 | break; |
2739 | case SYS_GETPEERNAME: | |
2740 | err = | |
b21c8f83 DB |
2741 | __sys_getpeername(a0, (struct sockaddr __user *)a1, |
2742 | (int __user *)a[2]); | |
89bddce5 SH |
2743 | break; |
2744 | case SYS_SOCKETPAIR: | |
6debc8d8 | 2745 | err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
89bddce5 SH |
2746 | break; |
2747 | case SYS_SEND: | |
f3bf896b DB |
2748 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2749 | NULL, 0); | |
89bddce5 SH |
2750 | break; |
2751 | case SYS_SENDTO: | |
211b634b DB |
2752 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2753 | (struct sockaddr __user *)a[4], a[5]); | |
89bddce5 SH |
2754 | break; |
2755 | case SYS_RECV: | |
d27e9afc DB |
2756 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2757 | NULL, NULL); | |
89bddce5 SH |
2758 | break; |
2759 | case SYS_RECVFROM: | |
7a09e1eb DB |
2760 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2761 | (struct sockaddr __user *)a[4], | |
2762 | (int __user *)a[5]); | |
89bddce5 SH |
2763 | break; |
2764 | case SYS_SHUTDOWN: | |
005a1aea | 2765 | err = __sys_shutdown(a0, a1); |
89bddce5 SH |
2766 | break; |
2767 | case SYS_SETSOCKOPT: | |
cc36dca0 DB |
2768 | err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], |
2769 | a[4]); | |
89bddce5 SH |
2770 | break; |
2771 | case SYS_GETSOCKOPT: | |
2772 | err = | |
13a2d70e DB |
2773 | __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
2774 | (int __user *)a[4]); | |
89bddce5 SH |
2775 | break; |
2776 | case SYS_SENDMSG: | |
e1834a32 DB |
2777 | err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, |
2778 | a[2], true); | |
89bddce5 | 2779 | break; |
228e548e | 2780 | case SYS_SENDMMSG: |
e1834a32 DB |
2781 | err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], |
2782 | a[3], true); | |
228e548e | 2783 | break; |
89bddce5 | 2784 | case SYS_RECVMSG: |
e1834a32 DB |
2785 | err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, |
2786 | a[2], true); | |
89bddce5 | 2787 | break; |
a2e27255 | 2788 | case SYS_RECVMMSG: |
e11d4284 AB |
2789 | if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME)) |
2790 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, | |
2791 | a[2], a[3], | |
2792 | (struct __kernel_timespec __user *)a[4], | |
2793 | NULL); | |
2794 | else | |
2795 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, | |
2796 | a[2], a[3], NULL, | |
2797 | (struct old_timespec32 __user *)a[4]); | |
a2e27255 | 2798 | break; |
de11defe | 2799 | case SYS_ACCEPT4: |
4541e805 DB |
2800 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
2801 | (int __user *)a[2], a[3]); | |
aaca0bdc | 2802 | break; |
89bddce5 SH |
2803 | default: |
2804 | err = -EINVAL; | |
2805 | break; | |
1da177e4 LT |
2806 | } |
2807 | return err; | |
2808 | } | |
2809 | ||
89bddce5 | 2810 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2811 | |
55737fda SH |
2812 | /** |
2813 | * sock_register - add a socket protocol handler | |
2814 | * @ops: description of protocol | |
2815 | * | |
1da177e4 LT |
2816 | * This function is called by a protocol handler that wants to |
2817 | * advertise its address family, and have it linked into the | |
e793c0f7 | 2818 | * socket interface. The value ops->family corresponds to the |
55737fda | 2819 | * socket system call protocol family. |
1da177e4 | 2820 | */ |
f0fd27d4 | 2821 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2822 | { |
2823 | int err; | |
2824 | ||
2825 | if (ops->family >= NPROTO) { | |
3410f22e | 2826 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
1da177e4 LT |
2827 | return -ENOBUFS; |
2828 | } | |
55737fda SH |
2829 | |
2830 | spin_lock(&net_family_lock); | |
190683a9 ED |
2831 | if (rcu_dereference_protected(net_families[ops->family], |
2832 | lockdep_is_held(&net_family_lock))) | |
55737fda SH |
2833 | err = -EEXIST; |
2834 | else { | |
cf778b00 | 2835 | rcu_assign_pointer(net_families[ops->family], ops); |
1da177e4 LT |
2836 | err = 0; |
2837 | } | |
55737fda SH |
2838 | spin_unlock(&net_family_lock); |
2839 | ||
3410f22e | 2840 | pr_info("NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
2841 | return err; |
2842 | } | |
c6d409cf | 2843 | EXPORT_SYMBOL(sock_register); |
1da177e4 | 2844 | |
55737fda SH |
2845 | /** |
2846 | * sock_unregister - remove a protocol handler | |
2847 | * @family: protocol family to remove | |
2848 | * | |
1da177e4 LT |
2849 | * This function is called by a protocol handler that wants to |
2850 | * remove its address family, and have it unlinked from the | |
55737fda SH |
2851 | * new socket creation. |
2852 | * | |
2853 | * If protocol handler is a module, then it can use module reference | |
2854 | * counts to protect against new references. If protocol handler is not | |
2855 | * a module then it needs to provide its own protection in | |
2856 | * the ops->create routine. | |
1da177e4 | 2857 | */ |
f0fd27d4 | 2858 | void sock_unregister(int family) |
1da177e4 | 2859 | { |
f0fd27d4 | 2860 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 2861 | |
55737fda | 2862 | spin_lock(&net_family_lock); |
a9b3cd7f | 2863 | RCU_INIT_POINTER(net_families[family], NULL); |
55737fda SH |
2864 | spin_unlock(&net_family_lock); |
2865 | ||
2866 | synchronize_rcu(); | |
2867 | ||
3410f22e | 2868 | pr_info("NET: Unregistered protocol family %d\n", family); |
1da177e4 | 2869 | } |
c6d409cf | 2870 | EXPORT_SYMBOL(sock_unregister); |
1da177e4 | 2871 | |
bf2ae2e4 XL |
2872 | bool sock_is_registered(int family) |
2873 | { | |
66b51b0a | 2874 | return family < NPROTO && rcu_access_pointer(net_families[family]); |
bf2ae2e4 XL |
2875 | } |
2876 | ||
77d76ea3 | 2877 | static int __init sock_init(void) |
1da177e4 | 2878 | { |
b3e19d92 | 2879 | int err; |
2ca794e5 EB |
2880 | /* |
2881 | * Initialize the network sysctl infrastructure. | |
2882 | */ | |
2883 | err = net_sysctl_init(); | |
2884 | if (err) | |
2885 | goto out; | |
b3e19d92 | 2886 | |
1da177e4 | 2887 | /* |
89bddce5 | 2888 | * Initialize skbuff SLAB cache |
1da177e4 LT |
2889 | */ |
2890 | skb_init(); | |
1da177e4 LT |
2891 | |
2892 | /* | |
89bddce5 | 2893 | * Initialize the protocols module. |
1da177e4 LT |
2894 | */ |
2895 | ||
2896 | init_inodecache(); | |
b3e19d92 NP |
2897 | |
2898 | err = register_filesystem(&sock_fs_type); | |
2899 | if (err) | |
2900 | goto out_fs; | |
1da177e4 | 2901 | sock_mnt = kern_mount(&sock_fs_type); |
b3e19d92 NP |
2902 | if (IS_ERR(sock_mnt)) { |
2903 | err = PTR_ERR(sock_mnt); | |
2904 | goto out_mount; | |
2905 | } | |
77d76ea3 AK |
2906 | |
2907 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
2908 | */ |
2909 | ||
2910 | #ifdef CONFIG_NETFILTER | |
6d11cfdb PNA |
2911 | err = netfilter_init(); |
2912 | if (err) | |
2913 | goto out; | |
1da177e4 | 2914 | #endif |
cbeb321a | 2915 | |
408eccce | 2916 | ptp_classifier_init(); |
c1f19b51 | 2917 | |
b3e19d92 NP |
2918 | out: |
2919 | return err; | |
2920 | ||
2921 | out_mount: | |
2922 | unregister_filesystem(&sock_fs_type); | |
2923 | out_fs: | |
2924 | goto out; | |
1da177e4 LT |
2925 | } |
2926 | ||
77d76ea3 AK |
2927 | core_initcall(sock_init); /* early initcall */ |
2928 | ||
1da177e4 LT |
2929 | #ifdef CONFIG_PROC_FS |
2930 | void socket_seq_show(struct seq_file *seq) | |
2931 | { | |
648845ab TZ |
2932 | seq_printf(seq, "sockets: used %d\n", |
2933 | sock_inuse_get(seq->private)); | |
1da177e4 | 2934 | } |
89bddce5 | 2935 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 2936 | |
89bbfc95 | 2937 | #ifdef CONFIG_COMPAT |
36fd633e | 2938 | static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) |
7a229387 | 2939 | { |
6b96018b | 2940 | struct compat_ifconf ifc32; |
7a229387 | 2941 | struct ifconf ifc; |
7a229387 AB |
2942 | int err; |
2943 | ||
6b96018b | 2944 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) |
7a229387 AB |
2945 | return -EFAULT; |
2946 | ||
36fd633e AV |
2947 | ifc.ifc_len = ifc32.ifc_len; |
2948 | ifc.ifc_req = compat_ptr(ifc32.ifcbuf); | |
7a229387 | 2949 | |
36fd633e AV |
2950 | rtnl_lock(); |
2951 | err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); | |
2952 | rtnl_unlock(); | |
7a229387 AB |
2953 | if (err) |
2954 | return err; | |
2955 | ||
36fd633e | 2956 | ifc32.ifc_len = ifc.ifc_len; |
6b96018b | 2957 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) |
7a229387 AB |
2958 | return -EFAULT; |
2959 | ||
2960 | return 0; | |
2961 | } | |
2962 | ||
6b96018b | 2963 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) |
7a229387 | 2964 | { |
3a7da39d BH |
2965 | struct compat_ethtool_rxnfc __user *compat_rxnfc; |
2966 | bool convert_in = false, convert_out = false; | |
44c02a2c AV |
2967 | size_t buf_size = 0; |
2968 | struct ethtool_rxnfc __user *rxnfc = NULL; | |
2969 | struct ifreq ifr; | |
3a7da39d BH |
2970 | u32 rule_cnt = 0, actual_rule_cnt; |
2971 | u32 ethcmd; | |
7a229387 | 2972 | u32 data; |
3a7da39d | 2973 | int ret; |
7a229387 | 2974 | |
3a7da39d BH |
2975 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) |
2976 | return -EFAULT; | |
7a229387 | 2977 | |
3a7da39d BH |
2978 | compat_rxnfc = compat_ptr(data); |
2979 | ||
2980 | if (get_user(ethcmd, &compat_rxnfc->cmd)) | |
7a229387 AB |
2981 | return -EFAULT; |
2982 | ||
3a7da39d BH |
2983 | /* Most ethtool structures are defined without padding. |
2984 | * Unfortunately struct ethtool_rxnfc is an exception. | |
2985 | */ | |
2986 | switch (ethcmd) { | |
2987 | default: | |
2988 | break; | |
2989 | case ETHTOOL_GRXCLSRLALL: | |
2990 | /* Buffer size is variable */ | |
2991 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) | |
2992 | return -EFAULT; | |
2993 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) | |
2994 | return -ENOMEM; | |
2995 | buf_size += rule_cnt * sizeof(u32); | |
2996 | /* fall through */ | |
2997 | case ETHTOOL_GRXRINGS: | |
2998 | case ETHTOOL_GRXCLSRLCNT: | |
2999 | case ETHTOOL_GRXCLSRULE: | |
55664f32 | 3000 | case ETHTOOL_SRXCLSRLINS: |
3a7da39d BH |
3001 | convert_out = true; |
3002 | /* fall through */ | |
3003 | case ETHTOOL_SRXCLSRLDEL: | |
3a7da39d BH |
3004 | buf_size += sizeof(struct ethtool_rxnfc); |
3005 | convert_in = true; | |
44c02a2c | 3006 | rxnfc = compat_alloc_user_space(buf_size); |
3a7da39d BH |
3007 | break; |
3008 | } | |
3009 | ||
44c02a2c | 3010 | if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) |
7a229387 AB |
3011 | return -EFAULT; |
3012 | ||
44c02a2c | 3013 | ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; |
7a229387 | 3014 | |
3a7da39d | 3015 | if (convert_in) { |
127fe533 | 3016 | /* We expect there to be holes between fs.m_ext and |
3a7da39d BH |
3017 | * fs.ring_cookie and at the end of fs, but nowhere else. |
3018 | */ | |
127fe533 AD |
3019 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + |
3020 | sizeof(compat_rxnfc->fs.m_ext) != | |
3021 | offsetof(struct ethtool_rxnfc, fs.m_ext) + | |
3022 | sizeof(rxnfc->fs.m_ext)); | |
3a7da39d BH |
3023 | BUILD_BUG_ON( |
3024 | offsetof(struct compat_ethtool_rxnfc, fs.location) - | |
3025 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != | |
3026 | offsetof(struct ethtool_rxnfc, fs.location) - | |
3027 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); | |
3028 | ||
3029 | if (copy_in_user(rxnfc, compat_rxnfc, | |
954b1244 SH |
3030 | (void __user *)(&rxnfc->fs.m_ext + 1) - |
3031 | (void __user *)rxnfc) || | |
3a7da39d BH |
3032 | copy_in_user(&rxnfc->fs.ring_cookie, |
3033 | &compat_rxnfc->fs.ring_cookie, | |
954b1244 | 3034 | (void __user *)(&rxnfc->fs.location + 1) - |
b6168562 WW |
3035 | (void __user *)&rxnfc->fs.ring_cookie)) |
3036 | return -EFAULT; | |
3037 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
3038 | if (put_user(rule_cnt, &rxnfc->rule_cnt)) | |
3039 | return -EFAULT; | |
3040 | } else if (copy_in_user(&rxnfc->rule_cnt, | |
3041 | &compat_rxnfc->rule_cnt, | |
3042 | sizeof(rxnfc->rule_cnt))) | |
3a7da39d BH |
3043 | return -EFAULT; |
3044 | } | |
3045 | ||
44c02a2c | 3046 | ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); |
3a7da39d BH |
3047 | if (ret) |
3048 | return ret; | |
3049 | ||
3050 | if (convert_out) { | |
3051 | if (copy_in_user(compat_rxnfc, rxnfc, | |
954b1244 SH |
3052 | (const void __user *)(&rxnfc->fs.m_ext + 1) - |
3053 | (const void __user *)rxnfc) || | |
3a7da39d BH |
3054 | copy_in_user(&compat_rxnfc->fs.ring_cookie, |
3055 | &rxnfc->fs.ring_cookie, | |
954b1244 SH |
3056 | (const void __user *)(&rxnfc->fs.location + 1) - |
3057 | (const void __user *)&rxnfc->fs.ring_cookie) || | |
3a7da39d BH |
3058 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, |
3059 | sizeof(rxnfc->rule_cnt))) | |
3060 | return -EFAULT; | |
3061 | ||
3062 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
3063 | /* As an optimisation, we only copy the actual | |
3064 | * number of rules that the underlying | |
3065 | * function returned. Since Mallory might | |
3066 | * change the rule count in user memory, we | |
3067 | * check that it is less than the rule count | |
3068 | * originally given (as the user buffer size), | |
3069 | * which has been range-checked. | |
3070 | */ | |
3071 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) | |
3072 | return -EFAULT; | |
3073 | if (actual_rule_cnt < rule_cnt) | |
3074 | rule_cnt = actual_rule_cnt; | |
3075 | if (copy_in_user(&compat_rxnfc->rule_locs[0], | |
3076 | &rxnfc->rule_locs[0], | |
3077 | rule_cnt * sizeof(u32))) | |
3078 | return -EFAULT; | |
3079 | } | |
3080 | } | |
3081 | ||
3082 | return 0; | |
7a229387 AB |
3083 | } |
3084 | ||
7a50a240 AB |
3085 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
3086 | { | |
7a50a240 | 3087 | compat_uptr_t uptr32; |
44c02a2c AV |
3088 | struct ifreq ifr; |
3089 | void __user *saved; | |
3090 | int err; | |
7a50a240 | 3091 | |
44c02a2c | 3092 | if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) |
7a50a240 AB |
3093 | return -EFAULT; |
3094 | ||
3095 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
3096 | return -EFAULT; | |
3097 | ||
44c02a2c AV |
3098 | saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; |
3099 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); | |
7a229387 | 3100 | |
44c02a2c AV |
3101 | err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); |
3102 | if (!err) { | |
3103 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; | |
3104 | if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) | |
3105 | err = -EFAULT; | |
ccbd6a5a | 3106 | } |
44c02a2c | 3107 | return err; |
7a229387 AB |
3108 | } |
3109 | ||
590d4693 BH |
3110 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ |
3111 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
6b96018b | 3112 | struct compat_ifreq __user *u_ifreq32) |
7a229387 | 3113 | { |
44c02a2c | 3114 | struct ifreq ifreq; |
7a229387 AB |
3115 | u32 data32; |
3116 | ||
44c02a2c | 3117 | if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) |
7a229387 | 3118 | return -EFAULT; |
44c02a2c | 3119 | if (get_user(data32, &u_ifreq32->ifr_data)) |
7a229387 | 3120 | return -EFAULT; |
44c02a2c | 3121 | ifreq.ifr_data = compat_ptr(data32); |
7a229387 | 3122 | |
44c02a2c | 3123 | return dev_ioctl(net, cmd, &ifreq, NULL); |
7a229387 AB |
3124 | } |
3125 | ||
37ac39bd JB |
3126 | static int compat_ifreq_ioctl(struct net *net, struct socket *sock, |
3127 | unsigned int cmd, | |
3128 | struct compat_ifreq __user *uifr32) | |
3129 | { | |
3130 | struct ifreq __user *uifr; | |
3131 | int err; | |
3132 | ||
3133 | /* Handle the fact that while struct ifreq has the same *layout* on | |
3134 | * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, | |
3135 | * which are handled elsewhere, it still has different *size* due to | |
3136 | * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, | |
3137 | * resulting in struct ifreq being 32 and 40 bytes respectively). | |
3138 | * As a result, if the struct happens to be at the end of a page and | |
3139 | * the next page isn't readable/writable, we get a fault. To prevent | |
3140 | * that, copy back and forth to the full size. | |
3141 | */ | |
3142 | ||
3143 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
3144 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) | |
3145 | return -EFAULT; | |
3146 | ||
3147 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); | |
3148 | ||
3149 | if (!err) { | |
3150 | switch (cmd) { | |
3151 | case SIOCGIFFLAGS: | |
3152 | case SIOCGIFMETRIC: | |
3153 | case SIOCGIFMTU: | |
3154 | case SIOCGIFMEM: | |
3155 | case SIOCGIFHWADDR: | |
3156 | case SIOCGIFINDEX: | |
3157 | case SIOCGIFADDR: | |
3158 | case SIOCGIFBRDADDR: | |
3159 | case SIOCGIFDSTADDR: | |
3160 | case SIOCGIFNETMASK: | |
3161 | case SIOCGIFPFLAGS: | |
3162 | case SIOCGIFTXQLEN: | |
3163 | case SIOCGMIIPHY: | |
3164 | case SIOCGMIIREG: | |
c6c9fee3 | 3165 | case SIOCGIFNAME: |
37ac39bd JB |
3166 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) |
3167 | err = -EFAULT; | |
3168 | break; | |
3169 | } | |
3170 | } | |
3171 | return err; | |
3172 | } | |
3173 | ||
a2116ed2 AB |
3174 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, |
3175 | struct compat_ifreq __user *uifr32) | |
3176 | { | |
3177 | struct ifreq ifr; | |
3178 | struct compat_ifmap __user *uifmap32; | |
a2116ed2 AB |
3179 | int err; |
3180 | ||
3181 | uifmap32 = &uifr32->ifr_ifru.ifru_map; | |
3182 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); | |
3ddc5b46 MD |
3183 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
3184 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
3185 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
3186 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); | |
3187 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); | |
3188 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); | |
a2116ed2 AB |
3189 | if (err) |
3190 | return -EFAULT; | |
3191 | ||
44c02a2c | 3192 | err = dev_ioctl(net, cmd, &ifr, NULL); |
a2116ed2 AB |
3193 | |
3194 | if (cmd == SIOCGIFMAP && !err) { | |
3195 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); | |
3ddc5b46 MD |
3196 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
3197 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
3198 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
3199 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); | |
3200 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); | |
3201 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); | |
a2116ed2 AB |
3202 | if (err) |
3203 | err = -EFAULT; | |
3204 | } | |
3205 | return err; | |
3206 | } | |
3207 | ||
7a229387 | 3208 | struct rtentry32 { |
c6d409cf | 3209 | u32 rt_pad1; |
7a229387 AB |
3210 | struct sockaddr rt_dst; /* target address */ |
3211 | struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ | |
3212 | struct sockaddr rt_genmask; /* target network mask (IP) */ | |
c6d409cf ED |
3213 | unsigned short rt_flags; |
3214 | short rt_pad2; | |
3215 | u32 rt_pad3; | |
3216 | unsigned char rt_tos; | |
3217 | unsigned char rt_class; | |
3218 | short rt_pad4; | |
3219 | short rt_metric; /* +1 for binary compatibility! */ | |
7a229387 | 3220 | /* char * */ u32 rt_dev; /* forcing the device at add */ |
c6d409cf ED |
3221 | u32 rt_mtu; /* per route MTU/Window */ |
3222 | u32 rt_window; /* Window clamping */ | |
7a229387 AB |
3223 | unsigned short rt_irtt; /* Initial RTT */ |
3224 | }; | |
3225 | ||
3226 | struct in6_rtmsg32 { | |
3227 | struct in6_addr rtmsg_dst; | |
3228 | struct in6_addr rtmsg_src; | |
3229 | struct in6_addr rtmsg_gateway; | |
3230 | u32 rtmsg_type; | |
3231 | u16 rtmsg_dst_len; | |
3232 | u16 rtmsg_src_len; | |
3233 | u32 rtmsg_metric; | |
3234 | u32 rtmsg_info; | |
3235 | u32 rtmsg_flags; | |
3236 | s32 rtmsg_ifindex; | |
3237 | }; | |
3238 | ||
6b96018b AB |
3239 | static int routing_ioctl(struct net *net, struct socket *sock, |
3240 | unsigned int cmd, void __user *argp) | |
7a229387 AB |
3241 | { |
3242 | int ret; | |
3243 | void *r = NULL; | |
3244 | struct in6_rtmsg r6; | |
3245 | struct rtentry r4; | |
3246 | char devname[16]; | |
3247 | u32 rtdev; | |
3248 | mm_segment_t old_fs = get_fs(); | |
3249 | ||
6b96018b AB |
3250 | if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ |
3251 | struct in6_rtmsg32 __user *ur6 = argp; | |
c6d409cf | 3252 | ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), |
7a229387 | 3253 | 3 * sizeof(struct in6_addr)); |
3ddc5b46 MD |
3254 | ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); |
3255 | ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); | |
3256 | ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); | |
3257 | ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); | |
3258 | ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); | |
3259 | ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); | |
3260 | ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); | |
7a229387 AB |
3261 | |
3262 | r = (void *) &r6; | |
3263 | } else { /* ipv4 */ | |
6b96018b | 3264 | struct rtentry32 __user *ur4 = argp; |
c6d409cf | 3265 | ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), |
7a229387 | 3266 | 3 * sizeof(struct sockaddr)); |
3ddc5b46 MD |
3267 | ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); |
3268 | ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); | |
3269 | ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); | |
3270 | ret |= get_user(r4.rt_window, &(ur4->rt_window)); | |
3271 | ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); | |
3272 | ret |= get_user(rtdev, &(ur4->rt_dev)); | |
7a229387 | 3273 | if (rtdev) { |
c6d409cf | 3274 | ret |= copy_from_user(devname, compat_ptr(rtdev), 15); |
c3f52ae6 | 3275 | r4.rt_dev = (char __user __force *)devname; |
3276 | devname[15] = 0; | |
7a229387 AB |
3277 | } else |
3278 | r4.rt_dev = NULL; | |
3279 | ||
3280 | r = (void *) &r4; | |
3281 | } | |
3282 | ||
3283 | if (ret) { | |
3284 | ret = -EFAULT; | |
3285 | goto out; | |
3286 | } | |
3287 | ||
c6d409cf | 3288 | set_fs(KERNEL_DS); |
63ff03ab | 3289 | ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); |
c6d409cf | 3290 | set_fs(old_fs); |
7a229387 AB |
3291 | |
3292 | out: | |
7a229387 AB |
3293 | return ret; |
3294 | } | |
3295 | ||
3296 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE | |
3297 | * for some operations; this forces use of the newer bridge-utils that | |
25985edc | 3298 | * use compatible ioctls |
7a229387 | 3299 | */ |
6b96018b | 3300 | static int old_bridge_ioctl(compat_ulong_t __user *argp) |
7a229387 | 3301 | { |
6b96018b | 3302 | compat_ulong_t tmp; |
7a229387 | 3303 | |
6b96018b | 3304 | if (get_user(tmp, argp)) |
7a229387 AB |
3305 | return -EFAULT; |
3306 | if (tmp == BRCTL_GET_VERSION) | |
3307 | return BRCTL_VERSION + 1; | |
3308 | return -EINVAL; | |
3309 | } | |
3310 | ||
6b96018b AB |
3311 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
3312 | unsigned int cmd, unsigned long arg) | |
3313 | { | |
3314 | void __user *argp = compat_ptr(arg); | |
3315 | struct sock *sk = sock->sk; | |
3316 | struct net *net = sock_net(sk); | |
7a229387 | 3317 | |
6b96018b | 3318 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
590d4693 | 3319 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3320 | |
3321 | switch (cmd) { | |
3322 | case SIOCSIFBR: | |
3323 | case SIOCGIFBR: | |
3324 | return old_bridge_ioctl(argp); | |
6b96018b | 3325 | case SIOCGIFCONF: |
36fd633e | 3326 | return compat_dev_ifconf(net, argp); |
6b96018b AB |
3327 | case SIOCETHTOOL: |
3328 | return ethtool_ioctl(net, argp); | |
7a50a240 AB |
3329 | case SIOCWANDEV: |
3330 | return compat_siocwandev(net, argp); | |
a2116ed2 AB |
3331 | case SIOCGIFMAP: |
3332 | case SIOCSIFMAP: | |
3333 | return compat_sioc_ifmap(net, cmd, argp); | |
6b96018b AB |
3334 | case SIOCADDRT: |
3335 | case SIOCDELRT: | |
3336 | return routing_ioctl(net, sock, cmd, argp); | |
0768e170 AB |
3337 | case SIOCGSTAMP_OLD: |
3338 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
3339 | if (!sock->ops->gettstamp) |
3340 | return -ENOIOCTLCMD; | |
0768e170 | 3341 | return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, |
c7cbdbf2 AB |
3342 | !COMPAT_USE_64BIT_TIME); |
3343 | ||
590d4693 BH |
3344 | case SIOCBONDSLAVEINFOQUERY: |
3345 | case SIOCBONDINFOQUERY: | |
a2116ed2 | 3346 | case SIOCSHWTSTAMP: |
fd468c74 | 3347 | case SIOCGHWTSTAMP: |
590d4693 | 3348 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3349 | |
3350 | case FIOSETOWN: | |
3351 | case SIOCSPGRP: | |
3352 | case FIOGETOWN: | |
3353 | case SIOCGPGRP: | |
3354 | case SIOCBRADDBR: | |
3355 | case SIOCBRDELBR: | |
3356 | case SIOCGIFVLAN: | |
3357 | case SIOCSIFVLAN: | |
3358 | case SIOCADDDLCI: | |
3359 | case SIOCDELDLCI: | |
c62cce2c | 3360 | case SIOCGSKNS: |
0768e170 AB |
3361 | case SIOCGSTAMP_NEW: |
3362 | case SIOCGSTAMPNS_NEW: | |
6b96018b AB |
3363 | return sock_ioctl(file, cmd, arg); |
3364 | ||
3365 | case SIOCGIFFLAGS: | |
3366 | case SIOCSIFFLAGS: | |
3367 | case SIOCGIFMETRIC: | |
3368 | case SIOCSIFMETRIC: | |
3369 | case SIOCGIFMTU: | |
3370 | case SIOCSIFMTU: | |
3371 | case SIOCGIFMEM: | |
3372 | case SIOCSIFMEM: | |
3373 | case SIOCGIFHWADDR: | |
3374 | case SIOCSIFHWADDR: | |
3375 | case SIOCADDMULTI: | |
3376 | case SIOCDELMULTI: | |
3377 | case SIOCGIFINDEX: | |
6b96018b AB |
3378 | case SIOCGIFADDR: |
3379 | case SIOCSIFADDR: | |
3380 | case SIOCSIFHWBROADCAST: | |
6b96018b | 3381 | case SIOCDIFADDR: |
6b96018b AB |
3382 | case SIOCGIFBRDADDR: |
3383 | case SIOCSIFBRDADDR: | |
3384 | case SIOCGIFDSTADDR: | |
3385 | case SIOCSIFDSTADDR: | |
3386 | case SIOCGIFNETMASK: | |
3387 | case SIOCSIFNETMASK: | |
3388 | case SIOCSIFPFLAGS: | |
3389 | case SIOCGIFPFLAGS: | |
3390 | case SIOCGIFTXQLEN: | |
3391 | case SIOCSIFTXQLEN: | |
3392 | case SIOCBRADDIF: | |
3393 | case SIOCBRDELIF: | |
c6c9fee3 | 3394 | case SIOCGIFNAME: |
9177efd3 AB |
3395 | case SIOCSIFNAME: |
3396 | case SIOCGMIIPHY: | |
3397 | case SIOCGMIIREG: | |
3398 | case SIOCSMIIREG: | |
f92d4fc9 AV |
3399 | case SIOCBONDENSLAVE: |
3400 | case SIOCBONDRELEASE: | |
3401 | case SIOCBONDSETHWADDR: | |
3402 | case SIOCBONDCHANGEACTIVE: | |
37ac39bd JB |
3403 | return compat_ifreq_ioctl(net, sock, cmd, argp); |
3404 | ||
6b96018b AB |
3405 | case SIOCSARP: |
3406 | case SIOCGARP: | |
3407 | case SIOCDARP: | |
6b96018b | 3408 | case SIOCATMARK: |
63ff03ab | 3409 | return sock_do_ioctl(net, sock, cmd, arg); |
9177efd3 AB |
3410 | } |
3411 | ||
6b96018b AB |
3412 | return -ENOIOCTLCMD; |
3413 | } | |
7a229387 | 3414 | |
95c96174 | 3415 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, |
89bddce5 | 3416 | unsigned long arg) |
89bbfc95 SP |
3417 | { |
3418 | struct socket *sock = file->private_data; | |
3419 | int ret = -ENOIOCTLCMD; | |
87de87d5 DM |
3420 | struct sock *sk; |
3421 | struct net *net; | |
3422 | ||
3423 | sk = sock->sk; | |
3424 | net = sock_net(sk); | |
89bbfc95 SP |
3425 | |
3426 | if (sock->ops->compat_ioctl) | |
3427 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3428 | ||
87de87d5 DM |
3429 | if (ret == -ENOIOCTLCMD && |
3430 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3431 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3432 | ||
6b96018b AB |
3433 | if (ret == -ENOIOCTLCMD) |
3434 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3435 | ||
89bbfc95 SP |
3436 | return ret; |
3437 | } | |
3438 | #endif | |
3439 | ||
8a3c245c PT |
3440 | /** |
3441 | * kernel_bind - bind an address to a socket (kernel space) | |
3442 | * @sock: socket | |
3443 | * @addr: address | |
3444 | * @addrlen: length of address | |
3445 | * | |
3446 | * Returns 0 or an error. | |
3447 | */ | |
3448 | ||
ac5a488e SS |
3449 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
3450 | { | |
3451 | return sock->ops->bind(sock, addr, addrlen); | |
3452 | } | |
c6d409cf | 3453 | EXPORT_SYMBOL(kernel_bind); |
ac5a488e | 3454 | |
8a3c245c PT |
3455 | /** |
3456 | * kernel_listen - move socket to listening state (kernel space) | |
3457 | * @sock: socket | |
3458 | * @backlog: pending connections queue size | |
3459 | * | |
3460 | * Returns 0 or an error. | |
3461 | */ | |
3462 | ||
ac5a488e SS |
3463 | int kernel_listen(struct socket *sock, int backlog) |
3464 | { | |
3465 | return sock->ops->listen(sock, backlog); | |
3466 | } | |
c6d409cf | 3467 | EXPORT_SYMBOL(kernel_listen); |
ac5a488e | 3468 | |
8a3c245c PT |
3469 | /** |
3470 | * kernel_accept - accept a connection (kernel space) | |
3471 | * @sock: listening socket | |
3472 | * @newsock: new connected socket | |
3473 | * @flags: flags | |
3474 | * | |
3475 | * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. | |
3476 | * If it fails, @newsock is guaranteed to be %NULL. | |
3477 | * Returns 0 or an error. | |
3478 | */ | |
3479 | ||
ac5a488e SS |
3480 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
3481 | { | |
3482 | struct sock *sk = sock->sk; | |
3483 | int err; | |
3484 | ||
3485 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3486 | newsock); | |
3487 | if (err < 0) | |
3488 | goto done; | |
3489 | ||
cdfbabfb | 3490 | err = sock->ops->accept(sock, *newsock, flags, true); |
ac5a488e SS |
3491 | if (err < 0) { |
3492 | sock_release(*newsock); | |
fa8705b0 | 3493 | *newsock = NULL; |
ac5a488e SS |
3494 | goto done; |
3495 | } | |
3496 | ||
3497 | (*newsock)->ops = sock->ops; | |
1b08534e | 3498 | __module_get((*newsock)->ops->owner); |
ac5a488e SS |
3499 | |
3500 | done: | |
3501 | return err; | |
3502 | } | |
c6d409cf | 3503 | EXPORT_SYMBOL(kernel_accept); |
ac5a488e | 3504 | |
8a3c245c PT |
3505 | /** |
3506 | * kernel_connect - connect a socket (kernel space) | |
3507 | * @sock: socket | |
3508 | * @addr: address | |
3509 | * @addrlen: address length | |
3510 | * @flags: flags (O_NONBLOCK, ...) | |
3511 | * | |
3512 | * For datagram sockets, @addr is the addres to which datagrams are sent | |
3513 | * by default, and the only address from which datagrams are received. | |
3514 | * For stream sockets, attempts to connect to @addr. | |
3515 | * Returns 0 or an error code. | |
3516 | */ | |
3517 | ||
ac5a488e | 3518 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
4768fbcb | 3519 | int flags) |
ac5a488e SS |
3520 | { |
3521 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3522 | } | |
c6d409cf | 3523 | EXPORT_SYMBOL(kernel_connect); |
ac5a488e | 3524 | |
8a3c245c PT |
3525 | /** |
3526 | * kernel_getsockname - get the address which the socket is bound (kernel space) | |
3527 | * @sock: socket | |
3528 | * @addr: address holder | |
3529 | * | |
3530 | * Fills the @addr pointer with the address which the socket is bound. | |
3531 | * Returns 0 or an error code. | |
3532 | */ | |
3533 | ||
9b2c45d4 | 3534 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3535 | { |
9b2c45d4 | 3536 | return sock->ops->getname(sock, addr, 0); |
ac5a488e | 3537 | } |
c6d409cf | 3538 | EXPORT_SYMBOL(kernel_getsockname); |
ac5a488e | 3539 | |
8a3c245c PT |
3540 | /** |
3541 | * kernel_peername - get the address which the socket is connected (kernel space) | |
3542 | * @sock: socket | |
3543 | * @addr: address holder | |
3544 | * | |
3545 | * Fills the @addr pointer with the address which the socket is connected. | |
3546 | * Returns 0 or an error code. | |
3547 | */ | |
3548 | ||
9b2c45d4 | 3549 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3550 | { |
9b2c45d4 | 3551 | return sock->ops->getname(sock, addr, 1); |
ac5a488e | 3552 | } |
c6d409cf | 3553 | EXPORT_SYMBOL(kernel_getpeername); |
ac5a488e | 3554 | |
8a3c245c PT |
3555 | /** |
3556 | * kernel_getsockopt - get a socket option (kernel space) | |
3557 | * @sock: socket | |
3558 | * @level: API level (SOL_SOCKET, ...) | |
3559 | * @optname: option tag | |
3560 | * @optval: option value | |
3561 | * @optlen: option length | |
3562 | * | |
3563 | * Assigns the option length to @optlen. | |
3564 | * Returns 0 or an error. | |
3565 | */ | |
3566 | ||
ac5a488e SS |
3567 | int kernel_getsockopt(struct socket *sock, int level, int optname, |
3568 | char *optval, int *optlen) | |
3569 | { | |
3570 | mm_segment_t oldfs = get_fs(); | |
fb8621bb NK |
3571 | char __user *uoptval; |
3572 | int __user *uoptlen; | |
ac5a488e SS |
3573 | int err; |
3574 | ||
fb8621bb NK |
3575 | uoptval = (char __user __force *) optval; |
3576 | uoptlen = (int __user __force *) optlen; | |
3577 | ||
ac5a488e SS |
3578 | set_fs(KERNEL_DS); |
3579 | if (level == SOL_SOCKET) | |
fb8621bb | 3580 | err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); |
ac5a488e | 3581 | else |
fb8621bb NK |
3582 | err = sock->ops->getsockopt(sock, level, optname, uoptval, |
3583 | uoptlen); | |
ac5a488e SS |
3584 | set_fs(oldfs); |
3585 | return err; | |
3586 | } | |
c6d409cf | 3587 | EXPORT_SYMBOL(kernel_getsockopt); |
ac5a488e | 3588 | |
8a3c245c PT |
3589 | /** |
3590 | * kernel_setsockopt - set a socket option (kernel space) | |
3591 | * @sock: socket | |
3592 | * @level: API level (SOL_SOCKET, ...) | |
3593 | * @optname: option tag | |
3594 | * @optval: option value | |
3595 | * @optlen: option length | |
3596 | * | |
3597 | * Returns 0 or an error. | |
3598 | */ | |
3599 | ||
ac5a488e | 3600 | int kernel_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 3601 | char *optval, unsigned int optlen) |
ac5a488e SS |
3602 | { |
3603 | mm_segment_t oldfs = get_fs(); | |
fb8621bb | 3604 | char __user *uoptval; |
ac5a488e SS |
3605 | int err; |
3606 | ||
fb8621bb NK |
3607 | uoptval = (char __user __force *) optval; |
3608 | ||
ac5a488e SS |
3609 | set_fs(KERNEL_DS); |
3610 | if (level == SOL_SOCKET) | |
fb8621bb | 3611 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); |
ac5a488e | 3612 | else |
fb8621bb | 3613 | err = sock->ops->setsockopt(sock, level, optname, uoptval, |
ac5a488e SS |
3614 | optlen); |
3615 | set_fs(oldfs); | |
3616 | return err; | |
3617 | } | |
c6d409cf | 3618 | EXPORT_SYMBOL(kernel_setsockopt); |
ac5a488e | 3619 | |
8a3c245c PT |
3620 | /** |
3621 | * kernel_sendpage - send a &page through a socket (kernel space) | |
3622 | * @sock: socket | |
3623 | * @page: page | |
3624 | * @offset: page offset | |
3625 | * @size: total size in bytes | |
3626 | * @flags: flags (MSG_DONTWAIT, ...) | |
3627 | * | |
3628 | * Returns the total amount sent in bytes or an error. | |
3629 | */ | |
3630 | ||
ac5a488e SS |
3631 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
3632 | size_t size, int flags) | |
3633 | { | |
3634 | if (sock->ops->sendpage) | |
3635 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
3636 | ||
3637 | return sock_no_sendpage(sock, page, offset, size, flags); | |
3638 | } | |
c6d409cf | 3639 | EXPORT_SYMBOL(kernel_sendpage); |
ac5a488e | 3640 | |
8a3c245c PT |
3641 | /** |
3642 | * kernel_sendpage_locked - send a &page through the locked sock (kernel space) | |
3643 | * @sk: sock | |
3644 | * @page: page | |
3645 | * @offset: page offset | |
3646 | * @size: total size in bytes | |
3647 | * @flags: flags (MSG_DONTWAIT, ...) | |
3648 | * | |
3649 | * Returns the total amount sent in bytes or an error. | |
3650 | * Caller must hold @sk. | |
3651 | */ | |
3652 | ||
306b13eb TH |
3653 | int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, |
3654 | size_t size, int flags) | |
3655 | { | |
3656 | struct socket *sock = sk->sk_socket; | |
3657 | ||
3658 | if (sock->ops->sendpage_locked) | |
3659 | return sock->ops->sendpage_locked(sk, page, offset, size, | |
3660 | flags); | |
3661 | ||
3662 | return sock_no_sendpage_locked(sk, page, offset, size, flags); | |
3663 | } | |
3664 | EXPORT_SYMBOL(kernel_sendpage_locked); | |
3665 | ||
8a3c245c PT |
3666 | /** |
3667 | * kernel_shutdown - shut down part of a full-duplex connection (kernel space) | |
3668 | * @sock: socket | |
3669 | * @how: connection part | |
3670 | * | |
3671 | * Returns 0 or an error. | |
3672 | */ | |
3673 | ||
91cf45f0 TM |
3674 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
3675 | { | |
3676 | return sock->ops->shutdown(sock, how); | |
3677 | } | |
91cf45f0 | 3678 | EXPORT_SYMBOL(kernel_sock_shutdown); |
113c3075 | 3679 | |
8a3c245c PT |
3680 | /** |
3681 | * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket | |
3682 | * @sk: socket | |
3683 | * | |
3684 | * This routine returns the IP overhead imposed by a socket i.e. | |
3685 | * the length of the underlying IP header, depending on whether | |
3686 | * this is an IPv4 or IPv6 socket and the length from IP options turned | |
3687 | * on at the socket. Assumes that the caller has a lock on the socket. | |
113c3075 | 3688 | */ |
8a3c245c | 3689 | |
113c3075 P |
3690 | u32 kernel_sock_ip_overhead(struct sock *sk) |
3691 | { | |
3692 | struct inet_sock *inet; | |
3693 | struct ip_options_rcu *opt; | |
3694 | u32 overhead = 0; | |
113c3075 P |
3695 | #if IS_ENABLED(CONFIG_IPV6) |
3696 | struct ipv6_pinfo *np; | |
3697 | struct ipv6_txoptions *optv6 = NULL; | |
3698 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3699 | ||
3700 | if (!sk) | |
3701 | return overhead; | |
3702 | ||
113c3075 P |
3703 | switch (sk->sk_family) { |
3704 | case AF_INET: | |
3705 | inet = inet_sk(sk); | |
3706 | overhead += sizeof(struct iphdr); | |
3707 | opt = rcu_dereference_protected(inet->inet_opt, | |
614d79c0 | 3708 | sock_owned_by_user(sk)); |
113c3075 P |
3709 | if (opt) |
3710 | overhead += opt->opt.optlen; | |
3711 | return overhead; | |
3712 | #if IS_ENABLED(CONFIG_IPV6) | |
3713 | case AF_INET6: | |
3714 | np = inet6_sk(sk); | |
3715 | overhead += sizeof(struct ipv6hdr); | |
3716 | if (np) | |
3717 | optv6 = rcu_dereference_protected(np->opt, | |
614d79c0 | 3718 | sock_owned_by_user(sk)); |
113c3075 P |
3719 | if (optv6) |
3720 | overhead += (optv6->opt_flen + optv6->opt_nflen); | |
3721 | return overhead; | |
3722 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3723 | default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ | |
3724 | return overhead; | |
3725 | } | |
3726 | } | |
3727 | EXPORT_SYMBOL(kernel_sock_ip_overhead); |