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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * NET An implementation of the SOCKET network access protocol. | |
4 | * | |
5 | * Version: @(#)socket.c 1.1.93 18/02/95 | |
6 | * | |
7 | * Authors: Orest Zborowski, <obz@Kodak.COM> | |
02c30a84 | 8 | * Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * | |
11 | * Fixes: | |
12 | * Anonymous : NOTSOCK/BADF cleanup. Error fix in | |
13 | * shutdown() | |
14 | * Alan Cox : verify_area() fixes | |
15 | * Alan Cox : Removed DDI | |
16 | * Jonathan Kamens : SOCK_DGRAM reconnect bug | |
17 | * Alan Cox : Moved a load of checks to the very | |
18 | * top level. | |
19 | * Alan Cox : Move address structures to/from user | |
20 | * mode above the protocol layers. | |
21 | * Rob Janssen : Allow 0 length sends. | |
22 | * Alan Cox : Asynchronous I/O support (cribbed from the | |
23 | * tty drivers). | |
24 | * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) | |
25 | * Jeff Uphoff : Made max number of sockets command-line | |
26 | * configurable. | |
27 | * Matti Aarnio : Made the number of sockets dynamic, | |
28 | * to be allocated when needed, and mr. | |
29 | * Uphoff's max is used as max to be | |
30 | * allowed to allocate. | |
31 | * Linus : Argh. removed all the socket allocation | |
32 | * altogether: it's in the inode now. | |
33 | * Alan Cox : Made sock_alloc()/sock_release() public | |
34 | * for NetROM and future kernel nfsd type | |
35 | * stuff. | |
36 | * Alan Cox : sendmsg/recvmsg basics. | |
37 | * Tom Dyas : Export net symbols. | |
38 | * Marcin Dalecki : Fixed problems with CONFIG_NET="n". | |
39 | * Alan Cox : Added thread locking to sys_* calls | |
40 | * for sockets. May have errors at the | |
41 | * moment. | |
42 | * Kevin Buhr : Fixed the dumb errors in the above. | |
43 | * Andi Kleen : Some small cleanups, optimizations, | |
44 | * and fixed a copy_from_user() bug. | |
45 | * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) | |
89bddce5 | 46 | * Tigran Aivazian : Made listen(2) backlog sanity checks |
1da177e4 LT |
47 | * protocol-independent |
48 | * | |
1da177e4 | 49 | * This module is effectively the top level interface to the BSD socket |
89bddce5 | 50 | * paradigm. |
1da177e4 LT |
51 | * |
52 | * Based upon Swansea University Computer Society NET3.039 | |
53 | */ | |
54 | ||
1da177e4 | 55 | #include <linux/mm.h> |
1da177e4 LT |
56 | #include <linux/socket.h> |
57 | #include <linux/file.h> | |
58 | #include <linux/net.h> | |
59 | #include <linux/interrupt.h> | |
aaca0bdc | 60 | #include <linux/thread_info.h> |
55737fda | 61 | #include <linux/rcupdate.h> |
1da177e4 LT |
62 | #include <linux/netdevice.h> |
63 | #include <linux/proc_fs.h> | |
64 | #include <linux/seq_file.h> | |
4a3e2f71 | 65 | #include <linux/mutex.h> |
1da177e4 | 66 | #include <linux/if_bridge.h> |
20380731 ACM |
67 | #include <linux/if_frad.h> |
68 | #include <linux/if_vlan.h> | |
408eccce | 69 | #include <linux/ptp_classify.h> |
1da177e4 LT |
70 | #include <linux/init.h> |
71 | #include <linux/poll.h> | |
72 | #include <linux/cache.h> | |
73 | #include <linux/module.h> | |
74 | #include <linux/highmem.h> | |
1da177e4 | 75 | #include <linux/mount.h> |
fba9be49 | 76 | #include <linux/pseudo_fs.h> |
1da177e4 LT |
77 | #include <linux/security.h> |
78 | #include <linux/syscalls.h> | |
79 | #include <linux/compat.h> | |
80 | #include <linux/kmod.h> | |
3ec3b2fb | 81 | #include <linux/audit.h> |
d86b5e0e | 82 | #include <linux/wireless.h> |
1b8d7ae4 | 83 | #include <linux/nsproxy.h> |
1fd7317d | 84 | #include <linux/magic.h> |
5a0e3ad6 | 85 | #include <linux/slab.h> |
600e1779 | 86 | #include <linux/xattr.h> |
c8e8cd57 | 87 | #include <linux/nospec.h> |
8c3c447b | 88 | #include <linux/indirect_call_wrapper.h> |
1da177e4 | 89 | |
7c0f6ba6 | 90 | #include <linux/uaccess.h> |
1da177e4 LT |
91 | #include <asm/unistd.h> |
92 | ||
93 | #include <net/compat.h> | |
87de87d5 | 94 | #include <net/wext.h> |
f8451725 | 95 | #include <net/cls_cgroup.h> |
1da177e4 LT |
96 | |
97 | #include <net/sock.h> | |
98 | #include <linux/netfilter.h> | |
99 | ||
6b96018b AB |
100 | #include <linux/if_tun.h> |
101 | #include <linux/ipv6_route.h> | |
102 | #include <linux/route.h> | |
c7dc504e | 103 | #include <linux/termios.h> |
6b96018b | 104 | #include <linux/sockios.h> |
076bb0c8 | 105 | #include <net/busy_poll.h> |
f24b9be5 | 106 | #include <linux/errqueue.h> |
06021292 | 107 | |
e0d1095a | 108 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 ET |
109 | unsigned int sysctl_net_busy_read __read_mostly; |
110 | unsigned int sysctl_net_busy_poll __read_mostly; | |
06021292 | 111 | #endif |
6b96018b | 112 | |
8ae5e030 AV |
113 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); |
114 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); | |
89bddce5 | 115 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
1da177e4 LT |
116 | |
117 | static int sock_close(struct inode *inode, struct file *file); | |
a11e1d43 LT |
118 | static __poll_t sock_poll(struct file *file, |
119 | struct poll_table_struct *wait); | |
89bddce5 | 120 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
89bbfc95 SP |
121 | #ifdef CONFIG_COMPAT |
122 | static long compat_sock_ioctl(struct file *file, | |
89bddce5 | 123 | unsigned int cmd, unsigned long arg); |
89bbfc95 | 124 | #endif |
1da177e4 | 125 | static int sock_fasync(int fd, struct file *filp, int on); |
1da177e4 LT |
126 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
127 | int offset, size_t size, loff_t *ppos, int more); | |
9c55e01c | 128 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 129 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c | 130 | unsigned int flags); |
542d3065 AB |
131 | |
132 | #ifdef CONFIG_PROC_FS | |
133 | static void sock_show_fdinfo(struct seq_file *m, struct file *f) | |
134 | { | |
135 | struct socket *sock = f->private_data; | |
136 | ||
137 | if (sock->ops->show_fdinfo) | |
138 | sock->ops->show_fdinfo(m, sock); | |
139 | } | |
140 | #else | |
141 | #define sock_show_fdinfo NULL | |
142 | #endif | |
1da177e4 | 143 | |
1da177e4 LT |
144 | /* |
145 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
146 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
147 | */ | |
148 | ||
da7071d7 | 149 | static const struct file_operations socket_file_ops = { |
1da177e4 LT |
150 | .owner = THIS_MODULE, |
151 | .llseek = no_llseek, | |
8ae5e030 AV |
152 | .read_iter = sock_read_iter, |
153 | .write_iter = sock_write_iter, | |
1da177e4 LT |
154 | .poll = sock_poll, |
155 | .unlocked_ioctl = sock_ioctl, | |
89bbfc95 SP |
156 | #ifdef CONFIG_COMPAT |
157 | .compat_ioctl = compat_sock_ioctl, | |
158 | #endif | |
1da177e4 | 159 | .mmap = sock_mmap, |
1da177e4 LT |
160 | .release = sock_close, |
161 | .fasync = sock_fasync, | |
5274f052 JA |
162 | .sendpage = sock_sendpage, |
163 | .splice_write = generic_splice_sendpage, | |
9c55e01c | 164 | .splice_read = sock_splice_read, |
b4653342 | 165 | .show_fdinfo = sock_show_fdinfo, |
1da177e4 LT |
166 | }; |
167 | ||
168 | /* | |
169 | * The protocol list. Each protocol is registered in here. | |
170 | */ | |
171 | ||
1da177e4 | 172 | static DEFINE_SPINLOCK(net_family_lock); |
190683a9 | 173 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; |
1da177e4 | 174 | |
1da177e4 | 175 | /* |
89bddce5 SH |
176 | * Support routines. |
177 | * Move socket addresses back and forth across the kernel/user | |
178 | * divide and look after the messy bits. | |
1da177e4 LT |
179 | */ |
180 | ||
1da177e4 LT |
181 | /** |
182 | * move_addr_to_kernel - copy a socket address into kernel space | |
183 | * @uaddr: Address in user space | |
184 | * @kaddr: Address in kernel space | |
185 | * @ulen: Length in user space | |
186 | * | |
187 | * The address is copied into kernel space. If the provided address is | |
188 | * too long an error code of -EINVAL is returned. If the copy gives | |
189 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
190 | */ | |
191 | ||
43db362d | 192 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) |
1da177e4 | 193 | { |
230b1839 | 194 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
1da177e4 | 195 | return -EINVAL; |
89bddce5 | 196 | if (ulen == 0) |
1da177e4 | 197 | return 0; |
89bddce5 | 198 | if (copy_from_user(kaddr, uaddr, ulen)) |
1da177e4 | 199 | return -EFAULT; |
3ec3b2fb | 200 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
201 | } |
202 | ||
203 | /** | |
204 | * move_addr_to_user - copy an address to user space | |
205 | * @kaddr: kernel space address | |
206 | * @klen: length of address in kernel | |
207 | * @uaddr: user space address | |
208 | * @ulen: pointer to user length field | |
209 | * | |
210 | * The value pointed to by ulen on entry is the buffer length available. | |
211 | * This is overwritten with the buffer space used. -EINVAL is returned | |
212 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
213 | * is returned if either the buffer or the length field are not | |
214 | * accessible. | |
215 | * After copying the data up to the limit the user specifies, the true | |
216 | * length of the data is written over the length limit the user | |
217 | * specified. Zero is returned for a success. | |
218 | */ | |
89bddce5 | 219 | |
43db362d | 220 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, |
11165f14 | 221 | void __user *uaddr, int __user *ulen) |
1da177e4 LT |
222 | { |
223 | int err; | |
224 | int len; | |
225 | ||
68c6beb3 | 226 | BUG_ON(klen > sizeof(struct sockaddr_storage)); |
89bddce5 SH |
227 | err = get_user(len, ulen); |
228 | if (err) | |
1da177e4 | 229 | return err; |
89bddce5 SH |
230 | if (len > klen) |
231 | len = klen; | |
68c6beb3 | 232 | if (len < 0) |
1da177e4 | 233 | return -EINVAL; |
89bddce5 | 234 | if (len) { |
d6fe3945 SG |
235 | if (audit_sockaddr(klen, kaddr)) |
236 | return -ENOMEM; | |
89bddce5 | 237 | if (copy_to_user(uaddr, kaddr, len)) |
1da177e4 LT |
238 | return -EFAULT; |
239 | } | |
240 | /* | |
89bddce5 SH |
241 | * "fromlen shall refer to the value before truncation.." |
242 | * 1003.1g | |
1da177e4 LT |
243 | */ |
244 | return __put_user(klen, ulen); | |
245 | } | |
246 | ||
08009a76 | 247 | static struct kmem_cache *sock_inode_cachep __ro_after_init; |
1da177e4 LT |
248 | |
249 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
250 | { | |
251 | struct socket_alloc *ei; | |
89bddce5 | 252 | |
e94b1766 | 253 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
254 | if (!ei) |
255 | return NULL; | |
333f7909 AV |
256 | init_waitqueue_head(&ei->socket.wq.wait); |
257 | ei->socket.wq.fasync_list = NULL; | |
258 | ei->socket.wq.flags = 0; | |
89bddce5 | 259 | |
1da177e4 LT |
260 | ei->socket.state = SS_UNCONNECTED; |
261 | ei->socket.flags = 0; | |
262 | ei->socket.ops = NULL; | |
263 | ei->socket.sk = NULL; | |
264 | ei->socket.file = NULL; | |
1da177e4 LT |
265 | |
266 | return &ei->vfs_inode; | |
267 | } | |
268 | ||
6d7855c5 | 269 | static void sock_free_inode(struct inode *inode) |
1da177e4 | 270 | { |
43815482 ED |
271 | struct socket_alloc *ei; |
272 | ||
273 | ei = container_of(inode, struct socket_alloc, vfs_inode); | |
43815482 | 274 | kmem_cache_free(sock_inode_cachep, ei); |
1da177e4 LT |
275 | } |
276 | ||
51cc5068 | 277 | static void init_once(void *foo) |
1da177e4 | 278 | { |
89bddce5 | 279 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
1da177e4 | 280 | |
a35afb83 | 281 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 282 | } |
89bddce5 | 283 | |
1e911632 | 284 | static void init_inodecache(void) |
1da177e4 LT |
285 | { |
286 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
89bddce5 SH |
287 | sizeof(struct socket_alloc), |
288 | 0, | |
289 | (SLAB_HWCACHE_ALIGN | | |
290 | SLAB_RECLAIM_ACCOUNT | | |
5d097056 | 291 | SLAB_MEM_SPREAD | SLAB_ACCOUNT), |
20c2df83 | 292 | init_once); |
1e911632 | 293 | BUG_ON(sock_inode_cachep == NULL); |
1da177e4 LT |
294 | } |
295 | ||
b87221de | 296 | static const struct super_operations sockfs_ops = { |
c6d409cf | 297 | .alloc_inode = sock_alloc_inode, |
6d7855c5 | 298 | .free_inode = sock_free_inode, |
c6d409cf | 299 | .statfs = simple_statfs, |
1da177e4 LT |
300 | }; |
301 | ||
c23fbb6b ED |
302 | /* |
303 | * sockfs_dname() is called from d_path(). | |
304 | */ | |
305 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
306 | { | |
307 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
c5ef6035 | 308 | d_inode(dentry)->i_ino); |
c23fbb6b ED |
309 | } |
310 | ||
3ba13d17 | 311 | static const struct dentry_operations sockfs_dentry_operations = { |
c23fbb6b | 312 | .d_dname = sockfs_dname, |
1da177e4 LT |
313 | }; |
314 | ||
bba0bd31 AG |
315 | static int sockfs_xattr_get(const struct xattr_handler *handler, |
316 | struct dentry *dentry, struct inode *inode, | |
317 | const char *suffix, void *value, size_t size) | |
318 | { | |
319 | if (value) { | |
320 | if (dentry->d_name.len + 1 > size) | |
321 | return -ERANGE; | |
322 | memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); | |
323 | } | |
324 | return dentry->d_name.len + 1; | |
325 | } | |
326 | ||
327 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
328 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
329 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
330 | ||
331 | static const struct xattr_handler sockfs_xattr_handler = { | |
332 | .name = XATTR_NAME_SOCKPROTONAME, | |
333 | .get = sockfs_xattr_get, | |
334 | }; | |
335 | ||
4a590153 AG |
336 | static int sockfs_security_xattr_set(const struct xattr_handler *handler, |
337 | struct dentry *dentry, struct inode *inode, | |
338 | const char *suffix, const void *value, | |
339 | size_t size, int flags) | |
340 | { | |
341 | /* Handled by LSM. */ | |
342 | return -EAGAIN; | |
343 | } | |
344 | ||
345 | static const struct xattr_handler sockfs_security_xattr_handler = { | |
346 | .prefix = XATTR_SECURITY_PREFIX, | |
347 | .set = sockfs_security_xattr_set, | |
348 | }; | |
349 | ||
bba0bd31 AG |
350 | static const struct xattr_handler *sockfs_xattr_handlers[] = { |
351 | &sockfs_xattr_handler, | |
4a590153 | 352 | &sockfs_security_xattr_handler, |
bba0bd31 AG |
353 | NULL |
354 | }; | |
355 | ||
fba9be49 | 356 | static int sockfs_init_fs_context(struct fs_context *fc) |
c74a1cbb | 357 | { |
fba9be49 DH |
358 | struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC); |
359 | if (!ctx) | |
360 | return -ENOMEM; | |
361 | ctx->ops = &sockfs_ops; | |
362 | ctx->dops = &sockfs_dentry_operations; | |
363 | ctx->xattr = sockfs_xattr_handlers; | |
364 | return 0; | |
c74a1cbb AV |
365 | } |
366 | ||
367 | static struct vfsmount *sock_mnt __read_mostly; | |
368 | ||
369 | static struct file_system_type sock_fs_type = { | |
370 | .name = "sockfs", | |
fba9be49 | 371 | .init_fs_context = sockfs_init_fs_context, |
c74a1cbb AV |
372 | .kill_sb = kill_anon_super, |
373 | }; | |
374 | ||
1da177e4 LT |
375 | /* |
376 | * Obtains the first available file descriptor and sets it up for use. | |
377 | * | |
39d8c1b6 DM |
378 | * These functions create file structures and maps them to fd space |
379 | * of the current process. On success it returns file descriptor | |
1da177e4 LT |
380 | * and file struct implicitly stored in sock->file. |
381 | * Note that another thread may close file descriptor before we return | |
382 | * from this function. We use the fact that now we do not refer | |
383 | * to socket after mapping. If one day we will need it, this | |
384 | * function will increment ref. count on file by 1. | |
385 | * | |
386 | * In any case returned fd MAY BE not valid! | |
387 | * This race condition is unavoidable | |
388 | * with shared fd spaces, we cannot solve it inside kernel, | |
389 | * but we take care of internal coherence yet. | |
390 | */ | |
391 | ||
8a3c245c PT |
392 | /** |
393 | * sock_alloc_file - Bind a &socket to a &file | |
394 | * @sock: socket | |
395 | * @flags: file status flags | |
396 | * @dname: protocol name | |
397 | * | |
398 | * Returns the &file bound with @sock, implicitly storing it | |
399 | * in sock->file. If dname is %NULL, sets to "". | |
400 | * On failure the return is a ERR pointer (see linux/err.h). | |
401 | * This function uses GFP_KERNEL internally. | |
402 | */ | |
403 | ||
aab174f0 | 404 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) |
1da177e4 | 405 | { |
7cbe66b6 | 406 | struct file *file; |
1da177e4 | 407 | |
d93aa9d8 AV |
408 | if (!dname) |
409 | dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; | |
39d8c1b6 | 410 | |
d93aa9d8 AV |
411 | file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, |
412 | O_RDWR | (flags & O_NONBLOCK), | |
413 | &socket_file_ops); | |
b5ffe634 | 414 | if (IS_ERR(file)) { |
8e1611e2 | 415 | sock_release(sock); |
39b65252 | 416 | return file; |
cc3808f8 AV |
417 | } |
418 | ||
419 | sock->file = file; | |
39d8c1b6 | 420 | file->private_data = sock; |
d8e464ec | 421 | stream_open(SOCK_INODE(sock), file); |
28407630 | 422 | return file; |
39d8c1b6 | 423 | } |
56b31d1c | 424 | EXPORT_SYMBOL(sock_alloc_file); |
39d8c1b6 | 425 | |
56b31d1c | 426 | static int sock_map_fd(struct socket *sock, int flags) |
39d8c1b6 DM |
427 | { |
428 | struct file *newfile; | |
28407630 | 429 | int fd = get_unused_fd_flags(flags); |
ce4bb04c AV |
430 | if (unlikely(fd < 0)) { |
431 | sock_release(sock); | |
28407630 | 432 | return fd; |
ce4bb04c | 433 | } |
39d8c1b6 | 434 | |
aab174f0 | 435 | newfile = sock_alloc_file(sock, flags, NULL); |
4546e44c | 436 | if (!IS_ERR(newfile)) { |
39d8c1b6 | 437 | fd_install(fd, newfile); |
28407630 AV |
438 | return fd; |
439 | } | |
7cbe66b6 | 440 | |
28407630 AV |
441 | put_unused_fd(fd); |
442 | return PTR_ERR(newfile); | |
1da177e4 LT |
443 | } |
444 | ||
8a3c245c PT |
445 | /** |
446 | * sock_from_file - Return the &socket bounded to @file. | |
447 | * @file: file | |
448 | * @err: pointer to an error code return | |
449 | * | |
450 | * On failure returns %NULL and assigns -ENOTSOCK to @err. | |
451 | */ | |
452 | ||
406a3c63 | 453 | struct socket *sock_from_file(struct file *file, int *err) |
6cb153ca | 454 | { |
6cb153ca BL |
455 | if (file->f_op == &socket_file_ops) |
456 | return file->private_data; /* set in sock_map_fd */ | |
457 | ||
23bb80d2 ED |
458 | *err = -ENOTSOCK; |
459 | return NULL; | |
6cb153ca | 460 | } |
406a3c63 | 461 | EXPORT_SYMBOL(sock_from_file); |
6cb153ca | 462 | |
1da177e4 | 463 | /** |
c6d409cf | 464 | * sockfd_lookup - Go from a file number to its socket slot |
1da177e4 LT |
465 | * @fd: file handle |
466 | * @err: pointer to an error code return | |
467 | * | |
468 | * The file handle passed in is locked and the socket it is bound | |
241c4667 | 469 | * to is returned. If an error occurs the err pointer is overwritten |
1da177e4 LT |
470 | * with a negative errno code and NULL is returned. The function checks |
471 | * for both invalid handles and passing a handle which is not a socket. | |
472 | * | |
473 | * On a success the socket object pointer is returned. | |
474 | */ | |
475 | ||
476 | struct socket *sockfd_lookup(int fd, int *err) | |
477 | { | |
478 | struct file *file; | |
1da177e4 LT |
479 | struct socket *sock; |
480 | ||
89bddce5 SH |
481 | file = fget(fd); |
482 | if (!file) { | |
1da177e4 LT |
483 | *err = -EBADF; |
484 | return NULL; | |
485 | } | |
89bddce5 | 486 | |
6cb153ca BL |
487 | sock = sock_from_file(file, err); |
488 | if (!sock) | |
1da177e4 | 489 | fput(file); |
6cb153ca BL |
490 | return sock; |
491 | } | |
c6d409cf | 492 | EXPORT_SYMBOL(sockfd_lookup); |
1da177e4 | 493 | |
6cb153ca BL |
494 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
495 | { | |
00e188ef | 496 | struct fd f = fdget(fd); |
6cb153ca BL |
497 | struct socket *sock; |
498 | ||
3672558c | 499 | *err = -EBADF; |
00e188ef AV |
500 | if (f.file) { |
501 | sock = sock_from_file(f.file, err); | |
502 | if (likely(sock)) { | |
503 | *fput_needed = f.flags; | |
6cb153ca | 504 | return sock; |
00e188ef AV |
505 | } |
506 | fdput(f); | |
1da177e4 | 507 | } |
6cb153ca | 508 | return NULL; |
1da177e4 LT |
509 | } |
510 | ||
600e1779 MY |
511 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, |
512 | size_t size) | |
513 | { | |
514 | ssize_t len; | |
515 | ssize_t used = 0; | |
516 | ||
c5ef6035 | 517 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); |
600e1779 MY |
518 | if (len < 0) |
519 | return len; | |
520 | used += len; | |
521 | if (buffer) { | |
522 | if (size < used) | |
523 | return -ERANGE; | |
524 | buffer += len; | |
525 | } | |
526 | ||
527 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
528 | used += len; | |
529 | if (buffer) { | |
530 | if (size < used) | |
531 | return -ERANGE; | |
532 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
533 | buffer += len; | |
534 | } | |
535 | ||
536 | return used; | |
537 | } | |
538 | ||
dc647ec8 | 539 | static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) |
86741ec2 LC |
540 | { |
541 | int err = simple_setattr(dentry, iattr); | |
542 | ||
e1a3a60a | 543 | if (!err && (iattr->ia_valid & ATTR_UID)) { |
86741ec2 LC |
544 | struct socket *sock = SOCKET_I(d_inode(dentry)); |
545 | ||
6d8c50dc CW |
546 | if (sock->sk) |
547 | sock->sk->sk_uid = iattr->ia_uid; | |
548 | else | |
549 | err = -ENOENT; | |
86741ec2 LC |
550 | } |
551 | ||
552 | return err; | |
553 | } | |
554 | ||
600e1779 | 555 | static const struct inode_operations sockfs_inode_ops = { |
600e1779 | 556 | .listxattr = sockfs_listxattr, |
86741ec2 | 557 | .setattr = sockfs_setattr, |
600e1779 MY |
558 | }; |
559 | ||
1da177e4 | 560 | /** |
8a3c245c | 561 | * sock_alloc - allocate a socket |
89bddce5 | 562 | * |
1da177e4 LT |
563 | * Allocate a new inode and socket object. The two are bound together |
564 | * and initialised. The socket is then returned. If we are out of inodes | |
8a3c245c | 565 | * NULL is returned. This functions uses GFP_KERNEL internally. |
1da177e4 LT |
566 | */ |
567 | ||
f4a00aac | 568 | struct socket *sock_alloc(void) |
1da177e4 | 569 | { |
89bddce5 SH |
570 | struct inode *inode; |
571 | struct socket *sock; | |
1da177e4 | 572 | |
a209dfc7 | 573 | inode = new_inode_pseudo(sock_mnt->mnt_sb); |
1da177e4 LT |
574 | if (!inode) |
575 | return NULL; | |
576 | ||
577 | sock = SOCKET_I(inode); | |
578 | ||
85fe4025 | 579 | inode->i_ino = get_next_ino(); |
89bddce5 | 580 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
8192b0c4 DH |
581 | inode->i_uid = current_fsuid(); |
582 | inode->i_gid = current_fsgid(); | |
600e1779 | 583 | inode->i_op = &sockfs_inode_ops; |
1da177e4 | 584 | |
1da177e4 LT |
585 | return sock; |
586 | } | |
f4a00aac | 587 | EXPORT_SYMBOL(sock_alloc); |
1da177e4 | 588 | |
6d8c50dc | 589 | static void __sock_release(struct socket *sock, struct inode *inode) |
1da177e4 LT |
590 | { |
591 | if (sock->ops) { | |
592 | struct module *owner = sock->ops->owner; | |
593 | ||
6d8c50dc CW |
594 | if (inode) |
595 | inode_lock(inode); | |
1da177e4 | 596 | sock->ops->release(sock); |
ff7b11aa | 597 | sock->sk = NULL; |
6d8c50dc CW |
598 | if (inode) |
599 | inode_unlock(inode); | |
1da177e4 LT |
600 | sock->ops = NULL; |
601 | module_put(owner); | |
602 | } | |
603 | ||
333f7909 | 604 | if (sock->wq.fasync_list) |
3410f22e | 605 | pr_err("%s: fasync list not empty!\n", __func__); |
1da177e4 | 606 | |
1da177e4 LT |
607 | if (!sock->file) { |
608 | iput(SOCK_INODE(sock)); | |
609 | return; | |
610 | } | |
89bddce5 | 611 | sock->file = NULL; |
1da177e4 | 612 | } |
6d8c50dc | 613 | |
9a8ad9ac AL |
614 | /** |
615 | * sock_release - close a socket | |
616 | * @sock: socket to close | |
617 | * | |
618 | * The socket is released from the protocol stack if it has a release | |
619 | * callback, and the inode is then released if the socket is bound to | |
620 | * an inode not a file. | |
621 | */ | |
6d8c50dc CW |
622 | void sock_release(struct socket *sock) |
623 | { | |
624 | __sock_release(sock, NULL); | |
625 | } | |
c6d409cf | 626 | EXPORT_SYMBOL(sock_release); |
1da177e4 | 627 | |
c14ac945 | 628 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) |
20d49473 | 629 | { |
140c55d4 ED |
630 | u8 flags = *tx_flags; |
631 | ||
c14ac945 | 632 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) |
140c55d4 ED |
633 | flags |= SKBTX_HW_TSTAMP; |
634 | ||
c14ac945 | 635 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) |
140c55d4 ED |
636 | flags |= SKBTX_SW_TSTAMP; |
637 | ||
c14ac945 | 638 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) |
140c55d4 ED |
639 | flags |= SKBTX_SCHED_TSTAMP; |
640 | ||
140c55d4 | 641 | *tx_flags = flags; |
20d49473 | 642 | } |
67cc0d40 | 643 | EXPORT_SYMBOL(__sock_tx_timestamp); |
20d49473 | 644 | |
8c3c447b PA |
645 | INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *, |
646 | size_t)); | |
a648a592 PA |
647 | INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *, |
648 | size_t)); | |
d8725c86 | 649 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) |
1da177e4 | 650 | { |
a648a592 PA |
651 | int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg, |
652 | inet_sendmsg, sock, msg, | |
653 | msg_data_left(msg)); | |
d8725c86 AV |
654 | BUG_ON(ret == -EIOCBQUEUED); |
655 | return ret; | |
1da177e4 LT |
656 | } |
657 | ||
85806af0 RD |
658 | /** |
659 | * sock_sendmsg - send a message through @sock | |
660 | * @sock: socket | |
661 | * @msg: message to send | |
662 | * | |
663 | * Sends @msg through @sock, passing through LSM. | |
664 | * Returns the number of bytes sent, or an error code. | |
665 | */ | |
d8725c86 | 666 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) |
228e548e | 667 | { |
d8725c86 | 668 | int err = security_socket_sendmsg(sock, msg, |
01e97e65 | 669 | msg_data_left(msg)); |
228e548e | 670 | |
d8725c86 | 671 | return err ?: sock_sendmsg_nosec(sock, msg); |
0cf00c6f | 672 | } |
c6d409cf | 673 | EXPORT_SYMBOL(sock_sendmsg); |
1da177e4 | 674 | |
8a3c245c PT |
675 | /** |
676 | * kernel_sendmsg - send a message through @sock (kernel-space) | |
677 | * @sock: socket | |
678 | * @msg: message header | |
679 | * @vec: kernel vec | |
680 | * @num: vec array length | |
681 | * @size: total message data size | |
682 | * | |
683 | * Builds the message data with @vec and sends it through @sock. | |
684 | * Returns the number of bytes sent, or an error code. | |
685 | */ | |
686 | ||
1da177e4 LT |
687 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
688 | struct kvec *vec, size_t num, size_t size) | |
689 | { | |
aa563d7b | 690 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
d8725c86 | 691 | return sock_sendmsg(sock, msg); |
1da177e4 | 692 | } |
c6d409cf | 693 | EXPORT_SYMBOL(kernel_sendmsg); |
1da177e4 | 694 | |
8a3c245c PT |
695 | /** |
696 | * kernel_sendmsg_locked - send a message through @sock (kernel-space) | |
697 | * @sk: sock | |
698 | * @msg: message header | |
699 | * @vec: output s/g array | |
700 | * @num: output s/g array length | |
701 | * @size: total message data size | |
702 | * | |
703 | * Builds the message data with @vec and sends it through @sock. | |
704 | * Returns the number of bytes sent, or an error code. | |
705 | * Caller must hold @sk. | |
706 | */ | |
707 | ||
306b13eb TH |
708 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, |
709 | struct kvec *vec, size_t num, size_t size) | |
710 | { | |
711 | struct socket *sock = sk->sk_socket; | |
712 | ||
713 | if (!sock->ops->sendmsg_locked) | |
db5980d8 | 714 | return sock_no_sendmsg_locked(sk, msg, size); |
306b13eb | 715 | |
aa563d7b | 716 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
306b13eb TH |
717 | |
718 | return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); | |
719 | } | |
720 | EXPORT_SYMBOL(kernel_sendmsg_locked); | |
721 | ||
8605330a SHY |
722 | static bool skb_is_err_queue(const struct sk_buff *skb) |
723 | { | |
724 | /* pkt_type of skbs enqueued on the error queue are set to | |
725 | * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do | |
726 | * in recvmsg, since skbs received on a local socket will never | |
727 | * have a pkt_type of PACKET_OUTGOING. | |
728 | */ | |
729 | return skb->pkt_type == PACKET_OUTGOING; | |
730 | } | |
731 | ||
b50a5c70 ML |
732 | /* On transmit, software and hardware timestamps are returned independently. |
733 | * As the two skb clones share the hardware timestamp, which may be updated | |
734 | * before the software timestamp is received, a hardware TX timestamp may be | |
735 | * returned only if there is no software TX timestamp. Ignore false software | |
736 | * timestamps, which may be made in the __sock_recv_timestamp() call when the | |
7f1bc6e9 | 737 | * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a |
b50a5c70 ML |
738 | * hardware timestamp. |
739 | */ | |
740 | static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) | |
741 | { | |
742 | return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); | |
743 | } | |
744 | ||
aad9c8c4 ML |
745 | static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
746 | { | |
747 | struct scm_ts_pktinfo ts_pktinfo; | |
748 | struct net_device *orig_dev; | |
749 | ||
750 | if (!skb_mac_header_was_set(skb)) | |
751 | return; | |
752 | ||
753 | memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); | |
754 | ||
755 | rcu_read_lock(); | |
756 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
757 | if (orig_dev) | |
758 | ts_pktinfo.if_index = orig_dev->ifindex; | |
759 | rcu_read_unlock(); | |
760 | ||
761 | ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); | |
762 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, | |
763 | sizeof(ts_pktinfo), &ts_pktinfo); | |
764 | } | |
765 | ||
92f37fd2 ED |
766 | /* |
767 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
768 | */ | |
769 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
770 | struct sk_buff *skb) | |
771 | { | |
20d49473 | 772 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
887feae3 | 773 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
9718475e DD |
774 | struct scm_timestamping_internal tss; |
775 | ||
b50a5c70 | 776 | int empty = 1, false_tstamp = 0; |
20d49473 PO |
777 | struct skb_shared_hwtstamps *shhwtstamps = |
778 | skb_hwtstamps(skb); | |
779 | ||
780 | /* Race occurred between timestamp enabling and packet | |
781 | receiving. Fill in the current time for now. */ | |
b50a5c70 | 782 | if (need_software_tstamp && skb->tstamp == 0) { |
20d49473 | 783 | __net_timestamp(skb); |
b50a5c70 ML |
784 | false_tstamp = 1; |
785 | } | |
20d49473 PO |
786 | |
787 | if (need_software_tstamp) { | |
788 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 DD |
789 | if (new_tstamp) { |
790 | struct __kernel_sock_timeval tv; | |
791 | ||
792 | skb_get_new_timestamp(skb, &tv); | |
793 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, | |
794 | sizeof(tv), &tv); | |
795 | } else { | |
796 | struct __kernel_old_timeval tv; | |
797 | ||
798 | skb_get_timestamp(skb, &tv); | |
799 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, | |
800 | sizeof(tv), &tv); | |
801 | } | |
20d49473 | 802 | } else { |
887feae3 DD |
803 | if (new_tstamp) { |
804 | struct __kernel_timespec ts; | |
805 | ||
806 | skb_get_new_timestampns(skb, &ts); | |
807 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, | |
808 | sizeof(ts), &ts); | |
809 | } else { | |
df1b4ba9 | 810 | struct __kernel_old_timespec ts; |
887feae3 DD |
811 | |
812 | skb_get_timestampns(skb, &ts); | |
813 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, | |
814 | sizeof(ts), &ts); | |
815 | } | |
20d49473 PO |
816 | } |
817 | } | |
818 | ||
f24b9be5 | 819 | memset(&tss, 0, sizeof(tss)); |
c199105d | 820 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && |
9718475e | 821 | ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) |
20d49473 | 822 | empty = 0; |
4d276eb6 | 823 | if (shhwtstamps && |
b9f40e21 | 824 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
b50a5c70 | 825 | !skb_is_swtx_tstamp(skb, false_tstamp) && |
9718475e | 826 | ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { |
4d276eb6 | 827 | empty = 0; |
aad9c8c4 ML |
828 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && |
829 | !skb_is_err_queue(skb)) | |
830 | put_ts_pktinfo(msg, skb); | |
831 | } | |
1c885808 | 832 | if (!empty) { |
9718475e DD |
833 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) |
834 | put_cmsg_scm_timestamping64(msg, &tss); | |
835 | else | |
836 | put_cmsg_scm_timestamping(msg, &tss); | |
1c885808 | 837 | |
8605330a | 838 | if (skb_is_err_queue(skb) && skb->len && |
4ef1b286 | 839 | SKB_EXT_ERR(skb)->opt_stats) |
1c885808 FY |
840 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, |
841 | skb->len, skb->data); | |
842 | } | |
92f37fd2 | 843 | } |
7c81fd8b ACM |
844 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
845 | ||
6e3e939f JB |
846 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
847 | struct sk_buff *skb) | |
848 | { | |
849 | int ack; | |
850 | ||
851 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
852 | return; | |
853 | if (!skb->wifi_acked_valid) | |
854 | return; | |
855 | ||
856 | ack = skb->wifi_acked; | |
857 | ||
858 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
861 | ||
11165f14 | 862 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
863 | struct sk_buff *skb) | |
3b885787 | 864 | { |
744d5a3e | 865 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) |
3b885787 | 866 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
744d5a3e | 867 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); |
3b885787 NH |
868 | } |
869 | ||
767dd033 | 870 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
3b885787 NH |
871 | struct sk_buff *skb) |
872 | { | |
873 | sock_recv_timestamp(msg, sk, skb); | |
874 | sock_recv_drops(msg, sk, skb); | |
875 | } | |
767dd033 | 876 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); |
3b885787 | 877 | |
8c3c447b | 878 | INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *, |
a648a592 PA |
879 | size_t, int)); |
880 | INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *, | |
881 | size_t, int)); | |
1b784140 | 882 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
2da62906 | 883 | int flags) |
1da177e4 | 884 | { |
a648a592 PA |
885 | return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg, |
886 | inet_recvmsg, sock, msg, msg_data_left(msg), | |
887 | flags); | |
1da177e4 LT |
888 | } |
889 | ||
85806af0 RD |
890 | /** |
891 | * sock_recvmsg - receive a message from @sock | |
892 | * @sock: socket | |
893 | * @msg: message to receive | |
894 | * @flags: message flags | |
895 | * | |
896 | * Receives @msg from @sock, passing through LSM. Returns the total number | |
897 | * of bytes received, or an error. | |
898 | */ | |
2da62906 | 899 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) |
a2e27255 | 900 | { |
2da62906 | 901 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); |
a2e27255 | 902 | |
2da62906 | 903 | return err ?: sock_recvmsg_nosec(sock, msg, flags); |
1da177e4 | 904 | } |
c6d409cf | 905 | EXPORT_SYMBOL(sock_recvmsg); |
1da177e4 | 906 | |
c1249c0a | 907 | /** |
8a3c245c PT |
908 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
909 | * @sock: The socket to receive the message from | |
910 | * @msg: Received message | |
911 | * @vec: Input s/g array for message data | |
912 | * @num: Size of input s/g array | |
913 | * @size: Number of bytes to read | |
914 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
c1249c0a | 915 | * |
8a3c245c PT |
916 | * On return the msg structure contains the scatter/gather array passed in the |
917 | * vec argument. The array is modified so that it consists of the unfilled | |
918 | * portion of the original array. | |
c1249c0a | 919 | * |
8a3c245c | 920 | * The returned value is the total number of bytes received, or an error. |
c1249c0a | 921 | */ |
8a3c245c | 922 | |
89bddce5 SH |
923 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
924 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 | 925 | { |
1f466e1f | 926 | msg->msg_control_is_user = false; |
aa563d7b | 927 | iov_iter_kvec(&msg->msg_iter, READ, vec, num, size); |
1f466e1f | 928 | return sock_recvmsg(sock, msg, flags); |
1da177e4 | 929 | } |
c6d409cf | 930 | EXPORT_SYMBOL(kernel_recvmsg); |
1da177e4 | 931 | |
ce1d4d3e CH |
932 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
933 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 934 | { |
1da177e4 LT |
935 | struct socket *sock; |
936 | int flags; | |
937 | ||
ce1d4d3e CH |
938 | sock = file->private_data; |
939 | ||
35f9c09f ED |
940 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
941 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
942 | flags |= more; | |
ce1d4d3e | 943 | |
e6949583 | 944 | return kernel_sendpage(sock, page, offset, size, flags); |
ce1d4d3e | 945 | } |
1da177e4 | 946 | |
9c55e01c | 947 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 948 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c JA |
949 | unsigned int flags) |
950 | { | |
951 | struct socket *sock = file->private_data; | |
952 | ||
997b37da | 953 | if (unlikely(!sock->ops->splice_read)) |
95506588 | 954 | return generic_file_splice_read(file, ppos, pipe, len, flags); |
997b37da | 955 | |
9c55e01c JA |
956 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
957 | } | |
958 | ||
8ae5e030 | 959 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) |
ce1d4d3e | 960 | { |
6d652330 AV |
961 | struct file *file = iocb->ki_filp; |
962 | struct socket *sock = file->private_data; | |
0345f931 | 963 | struct msghdr msg = {.msg_iter = *to, |
964 | .msg_iocb = iocb}; | |
8ae5e030 | 965 | ssize_t res; |
ce1d4d3e | 966 | |
ebfcd895 | 967 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
968 | msg.msg_flags = MSG_DONTWAIT; |
969 | ||
970 | if (iocb->ki_pos != 0) | |
1da177e4 | 971 | return -ESPIPE; |
027445c3 | 972 | |
66ee59af | 973 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ |
1da177e4 LT |
974 | return 0; |
975 | ||
2da62906 | 976 | res = sock_recvmsg(sock, &msg, msg.msg_flags); |
8ae5e030 AV |
977 | *to = msg.msg_iter; |
978 | return res; | |
1da177e4 LT |
979 | } |
980 | ||
8ae5e030 | 981 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ce1d4d3e | 982 | { |
6d652330 AV |
983 | struct file *file = iocb->ki_filp; |
984 | struct socket *sock = file->private_data; | |
0345f931 | 985 | struct msghdr msg = {.msg_iter = *from, |
986 | .msg_iocb = iocb}; | |
8ae5e030 | 987 | ssize_t res; |
1da177e4 | 988 | |
8ae5e030 | 989 | if (iocb->ki_pos != 0) |
ce1d4d3e | 990 | return -ESPIPE; |
027445c3 | 991 | |
ebfcd895 | 992 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
993 | msg.msg_flags = MSG_DONTWAIT; |
994 | ||
6d652330 AV |
995 | if (sock->type == SOCK_SEQPACKET) |
996 | msg.msg_flags |= MSG_EOR; | |
997 | ||
d8725c86 | 998 | res = sock_sendmsg(sock, &msg); |
8ae5e030 AV |
999 | *from = msg.msg_iter; |
1000 | return res; | |
1da177e4 LT |
1001 | } |
1002 | ||
1da177e4 LT |
1003 | /* |
1004 | * Atomic setting of ioctl hooks to avoid race | |
1005 | * with module unload. | |
1006 | */ | |
1007 | ||
4a3e2f71 | 1008 | static DEFINE_MUTEX(br_ioctl_mutex); |
c6d409cf | 1009 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); |
1da177e4 | 1010 | |
881d966b | 1011 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
1da177e4 | 1012 | { |
4a3e2f71 | 1013 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 1014 | br_ioctl_hook = hook; |
4a3e2f71 | 1015 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1016 | } |
1017 | EXPORT_SYMBOL(brioctl_set); | |
1018 | ||
4a3e2f71 | 1019 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 1020 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 1021 | |
881d966b | 1022 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 1023 | { |
4a3e2f71 | 1024 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1025 | vlan_ioctl_hook = hook; |
4a3e2f71 | 1026 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 LT |
1027 | } |
1028 | EXPORT_SYMBOL(vlan_ioctl_set); | |
1029 | ||
4a3e2f71 | 1030 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
89bddce5 | 1031 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
1da177e4 | 1032 | |
89bddce5 | 1033 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
1da177e4 | 1034 | { |
4a3e2f71 | 1035 | mutex_lock(&dlci_ioctl_mutex); |
1da177e4 | 1036 | dlci_ioctl_hook = hook; |
4a3e2f71 | 1037 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 LT |
1038 | } |
1039 | EXPORT_SYMBOL(dlci_ioctl_set); | |
1040 | ||
6b96018b | 1041 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
63ff03ab | 1042 | unsigned int cmd, unsigned long arg) |
6b96018b AB |
1043 | { |
1044 | int err; | |
1045 | void __user *argp = (void __user *)arg; | |
1046 | ||
1047 | err = sock->ops->ioctl(sock, cmd, arg); | |
1048 | ||
1049 | /* | |
1050 | * If this ioctl is unknown try to hand it down | |
1051 | * to the NIC driver. | |
1052 | */ | |
36fd633e AV |
1053 | if (err != -ENOIOCTLCMD) |
1054 | return err; | |
6b96018b | 1055 | |
36fd633e AV |
1056 | if (cmd == SIOCGIFCONF) { |
1057 | struct ifconf ifc; | |
1058 | if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) | |
1059 | return -EFAULT; | |
1060 | rtnl_lock(); | |
1061 | err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); | |
1062 | rtnl_unlock(); | |
1063 | if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) | |
1064 | err = -EFAULT; | |
44c02a2c AV |
1065 | } else { |
1066 | struct ifreq ifr; | |
1067 | bool need_copyout; | |
63ff03ab | 1068 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) |
44c02a2c AV |
1069 | return -EFAULT; |
1070 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); | |
1071 | if (!err && need_copyout) | |
63ff03ab | 1072 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) |
44c02a2c | 1073 | return -EFAULT; |
36fd633e | 1074 | } |
6b96018b AB |
1075 | return err; |
1076 | } | |
1077 | ||
1da177e4 LT |
1078 | /* |
1079 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
1080 | * what to do with it - that's up to the protocol still. | |
1081 | */ | |
1082 | ||
8a3c245c PT |
1083 | /** |
1084 | * get_net_ns - increment the refcount of the network namespace | |
1085 | * @ns: common namespace (net) | |
1086 | * | |
1087 | * Returns the net's common namespace. | |
1088 | */ | |
1089 | ||
d8d211a2 | 1090 | struct ns_common *get_net_ns(struct ns_common *ns) |
c62cce2c AV |
1091 | { |
1092 | return &get_net(container_of(ns, struct net, ns))->ns; | |
1093 | } | |
d8d211a2 | 1094 | EXPORT_SYMBOL_GPL(get_net_ns); |
c62cce2c | 1095 | |
1da177e4 LT |
1096 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1097 | { | |
1098 | struct socket *sock; | |
881d966b | 1099 | struct sock *sk; |
1da177e4 LT |
1100 | void __user *argp = (void __user *)arg; |
1101 | int pid, err; | |
881d966b | 1102 | struct net *net; |
1da177e4 | 1103 | |
b69aee04 | 1104 | sock = file->private_data; |
881d966b | 1105 | sk = sock->sk; |
3b1e0a65 | 1106 | net = sock_net(sk); |
44c02a2c AV |
1107 | if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { |
1108 | struct ifreq ifr; | |
1109 | bool need_copyout; | |
1110 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) | |
1111 | return -EFAULT; | |
1112 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); | |
1113 | if (!err && need_copyout) | |
1114 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) | |
1115 | return -EFAULT; | |
1da177e4 | 1116 | } else |
3d23e349 | 1117 | #ifdef CONFIG_WEXT_CORE |
1da177e4 | 1118 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
b1b0c245 | 1119 | err = wext_handle_ioctl(net, cmd, argp); |
1da177e4 | 1120 | } else |
3d23e349 | 1121 | #endif |
89bddce5 | 1122 | switch (cmd) { |
1da177e4 LT |
1123 | case FIOSETOWN: |
1124 | case SIOCSPGRP: | |
1125 | err = -EFAULT; | |
1126 | if (get_user(pid, (int __user *)argp)) | |
1127 | break; | |
393cc3f5 | 1128 | err = f_setown(sock->file, pid, 1); |
1da177e4 LT |
1129 | break; |
1130 | case FIOGETOWN: | |
1131 | case SIOCGPGRP: | |
609d7fa9 | 1132 | err = put_user(f_getown(sock->file), |
89bddce5 | 1133 | (int __user *)argp); |
1da177e4 LT |
1134 | break; |
1135 | case SIOCGIFBR: | |
1136 | case SIOCSIFBR: | |
1137 | case SIOCBRADDBR: | |
1138 | case SIOCBRDELBR: | |
1139 | err = -ENOPKG; | |
1140 | if (!br_ioctl_hook) | |
1141 | request_module("bridge"); | |
1142 | ||
4a3e2f71 | 1143 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 1144 | if (br_ioctl_hook) |
881d966b | 1145 | err = br_ioctl_hook(net, cmd, argp); |
4a3e2f71 | 1146 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1147 | break; |
1148 | case SIOCGIFVLAN: | |
1149 | case SIOCSIFVLAN: | |
1150 | err = -ENOPKG; | |
1151 | if (!vlan_ioctl_hook) | |
1152 | request_module("8021q"); | |
1153 | ||
4a3e2f71 | 1154 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1155 | if (vlan_ioctl_hook) |
881d966b | 1156 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 1157 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 1158 | break; |
1da177e4 LT |
1159 | case SIOCADDDLCI: |
1160 | case SIOCDELDLCI: | |
1161 | err = -ENOPKG; | |
1162 | if (!dlci_ioctl_hook) | |
1163 | request_module("dlci"); | |
1164 | ||
7512cbf6 PE |
1165 | mutex_lock(&dlci_ioctl_mutex); |
1166 | if (dlci_ioctl_hook) | |
1da177e4 | 1167 | err = dlci_ioctl_hook(cmd, argp); |
7512cbf6 | 1168 | mutex_unlock(&dlci_ioctl_mutex); |
1da177e4 | 1169 | break; |
c62cce2c AV |
1170 | case SIOCGSKNS: |
1171 | err = -EPERM; | |
1172 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1173 | break; | |
1174 | ||
1175 | err = open_related_ns(&net->ns, get_net_ns); | |
1176 | break; | |
0768e170 AB |
1177 | case SIOCGSTAMP_OLD: |
1178 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
1179 | if (!sock->ops->gettstamp) { |
1180 | err = -ENOIOCTLCMD; | |
1181 | break; | |
1182 | } | |
1183 | err = sock->ops->gettstamp(sock, argp, | |
0768e170 AB |
1184 | cmd == SIOCGSTAMP_OLD, |
1185 | !IS_ENABLED(CONFIG_64BIT)); | |
60747828 | 1186 | break; |
0768e170 AB |
1187 | case SIOCGSTAMP_NEW: |
1188 | case SIOCGSTAMPNS_NEW: | |
1189 | if (!sock->ops->gettstamp) { | |
1190 | err = -ENOIOCTLCMD; | |
1191 | break; | |
1192 | } | |
1193 | err = sock->ops->gettstamp(sock, argp, | |
1194 | cmd == SIOCGSTAMP_NEW, | |
1195 | false); | |
c7cbdbf2 | 1196 | break; |
1da177e4 | 1197 | default: |
63ff03ab | 1198 | err = sock_do_ioctl(net, sock, cmd, arg); |
1da177e4 | 1199 | break; |
89bddce5 | 1200 | } |
1da177e4 LT |
1201 | return err; |
1202 | } | |
1203 | ||
8a3c245c PT |
1204 | /** |
1205 | * sock_create_lite - creates a socket | |
1206 | * @family: protocol family (AF_INET, ...) | |
1207 | * @type: communication type (SOCK_STREAM, ...) | |
1208 | * @protocol: protocol (0, ...) | |
1209 | * @res: new socket | |
1210 | * | |
1211 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1212 | * The new socket initialization is not complete, see kernel_accept(). | |
1213 | * Returns 0 or an error. On failure @res is set to %NULL. | |
1214 | * This function internally uses GFP_KERNEL. | |
1215 | */ | |
1216 | ||
1da177e4 LT |
1217 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
1218 | { | |
1219 | int err; | |
1220 | struct socket *sock = NULL; | |
89bddce5 | 1221 | |
1da177e4 LT |
1222 | err = security_socket_create(family, type, protocol, 1); |
1223 | if (err) | |
1224 | goto out; | |
1225 | ||
1226 | sock = sock_alloc(); | |
1227 | if (!sock) { | |
1228 | err = -ENOMEM; | |
1229 | goto out; | |
1230 | } | |
1231 | ||
1da177e4 | 1232 | sock->type = type; |
7420ed23 VY |
1233 | err = security_socket_post_create(sock, family, type, protocol, 1); |
1234 | if (err) | |
1235 | goto out_release; | |
1236 | ||
1da177e4 LT |
1237 | out: |
1238 | *res = sock; | |
1239 | return err; | |
7420ed23 VY |
1240 | out_release: |
1241 | sock_release(sock); | |
1242 | sock = NULL; | |
1243 | goto out; | |
1da177e4 | 1244 | } |
c6d409cf | 1245 | EXPORT_SYMBOL(sock_create_lite); |
1da177e4 LT |
1246 | |
1247 | /* No kernel lock held - perfect */ | |
ade994f4 | 1248 | static __poll_t sock_poll(struct file *file, poll_table *wait) |
1da177e4 | 1249 | { |
3cafb376 | 1250 | struct socket *sock = file->private_data; |
a331de3b | 1251 | __poll_t events = poll_requested_events(wait), flag = 0; |
2d48d67f | 1252 | |
e88958e6 CH |
1253 | if (!sock->ops->poll) |
1254 | return 0; | |
f641f13b | 1255 | |
a331de3b CH |
1256 | if (sk_can_busy_loop(sock->sk)) { |
1257 | /* poll once if requested by the syscall */ | |
1258 | if (events & POLL_BUSY_LOOP) | |
1259 | sk_busy_loop(sock->sk, 1); | |
1260 | ||
1261 | /* if this socket can poll_ll, tell the system call */ | |
1262 | flag = POLL_BUSY_LOOP; | |
1263 | } | |
1264 | ||
1265 | return sock->ops->poll(file, sock, wait) | flag; | |
1da177e4 LT |
1266 | } |
1267 | ||
89bddce5 | 1268 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 1269 | { |
b69aee04 | 1270 | struct socket *sock = file->private_data; |
1da177e4 LT |
1271 | |
1272 | return sock->ops->mmap(file, sock, vma); | |
1273 | } | |
1274 | ||
20380731 | 1275 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 | 1276 | { |
6d8c50dc | 1277 | __sock_release(SOCKET_I(inode), inode); |
1da177e4 LT |
1278 | return 0; |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * Update the socket async list | |
1283 | * | |
1284 | * Fasync_list locking strategy. | |
1285 | * | |
1286 | * 1. fasync_list is modified only under process context socket lock | |
1287 | * i.e. under semaphore. | |
1288 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
989a2979 | 1289 | * or under socket lock |
1da177e4 LT |
1290 | */ |
1291 | ||
1292 | static int sock_fasync(int fd, struct file *filp, int on) | |
1293 | { | |
989a2979 ED |
1294 | struct socket *sock = filp->private_data; |
1295 | struct sock *sk = sock->sk; | |
333f7909 | 1296 | struct socket_wq *wq = &sock->wq; |
1da177e4 | 1297 | |
989a2979 | 1298 | if (sk == NULL) |
1da177e4 | 1299 | return -EINVAL; |
1da177e4 LT |
1300 | |
1301 | lock_sock(sk); | |
eaefd110 | 1302 | fasync_helper(fd, filp, on, &wq->fasync_list); |
1da177e4 | 1303 | |
eaefd110 | 1304 | if (!wq->fasync_list) |
989a2979 ED |
1305 | sock_reset_flag(sk, SOCK_FASYNC); |
1306 | else | |
bcdce719 | 1307 | sock_set_flag(sk, SOCK_FASYNC); |
1da177e4 | 1308 | |
989a2979 | 1309 | release_sock(sk); |
1da177e4 LT |
1310 | return 0; |
1311 | } | |
1312 | ||
ceb5d58b | 1313 | /* This function may be called only under rcu_lock */ |
1da177e4 | 1314 | |
ceb5d58b | 1315 | int sock_wake_async(struct socket_wq *wq, int how, int band) |
1da177e4 | 1316 | { |
ceb5d58b | 1317 | if (!wq || !wq->fasync_list) |
1da177e4 | 1318 | return -1; |
ceb5d58b | 1319 | |
89bddce5 | 1320 | switch (how) { |
8d8ad9d7 | 1321 | case SOCK_WAKE_WAITD: |
ceb5d58b | 1322 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) |
1da177e4 LT |
1323 | break; |
1324 | goto call_kill; | |
8d8ad9d7 | 1325 | case SOCK_WAKE_SPACE: |
ceb5d58b | 1326 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) |
1da177e4 LT |
1327 | break; |
1328 | /* fall through */ | |
8d8ad9d7 | 1329 | case SOCK_WAKE_IO: |
89bddce5 | 1330 | call_kill: |
43815482 | 1331 | kill_fasync(&wq->fasync_list, SIGIO, band); |
1da177e4 | 1332 | break; |
8d8ad9d7 | 1333 | case SOCK_WAKE_URG: |
43815482 | 1334 | kill_fasync(&wq->fasync_list, SIGURG, band); |
1da177e4 | 1335 | } |
ceb5d58b | 1336 | |
1da177e4 LT |
1337 | return 0; |
1338 | } | |
c6d409cf | 1339 | EXPORT_SYMBOL(sock_wake_async); |
1da177e4 | 1340 | |
8a3c245c PT |
1341 | /** |
1342 | * __sock_create - creates a socket | |
1343 | * @net: net namespace | |
1344 | * @family: protocol family (AF_INET, ...) | |
1345 | * @type: communication type (SOCK_STREAM, ...) | |
1346 | * @protocol: protocol (0, ...) | |
1347 | * @res: new socket | |
1348 | * @kern: boolean for kernel space sockets | |
1349 | * | |
1350 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1351 | * Returns 0 or an error. On failure @res is set to %NULL. @kern must | |
1352 | * be set to true if the socket resides in kernel space. | |
1353 | * This function internally uses GFP_KERNEL. | |
1354 | */ | |
1355 | ||
721db93a | 1356 | int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1357 | struct socket **res, int kern) |
1da177e4 LT |
1358 | { |
1359 | int err; | |
1360 | struct socket *sock; | |
55737fda | 1361 | const struct net_proto_family *pf; |
1da177e4 LT |
1362 | |
1363 | /* | |
89bddce5 | 1364 | * Check protocol is in range |
1da177e4 LT |
1365 | */ |
1366 | if (family < 0 || family >= NPROTO) | |
1367 | return -EAFNOSUPPORT; | |
1368 | if (type < 0 || type >= SOCK_MAX) | |
1369 | return -EINVAL; | |
1370 | ||
1371 | /* Compatibility. | |
1372 | ||
1373 | This uglymoron is moved from INET layer to here to avoid | |
1374 | deadlock in module load. | |
1375 | */ | |
1376 | if (family == PF_INET && type == SOCK_PACKET) { | |
f3c98690 | 1377 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1378 | current->comm); | |
1da177e4 LT |
1379 | family = PF_PACKET; |
1380 | } | |
1381 | ||
1382 | err = security_socket_create(family, type, protocol, kern); | |
1383 | if (err) | |
1384 | return err; | |
89bddce5 | 1385 | |
55737fda SH |
1386 | /* |
1387 | * Allocate the socket and allow the family to set things up. if | |
1388 | * the protocol is 0, the family is instructed to select an appropriate | |
1389 | * default. | |
1390 | */ | |
1391 | sock = sock_alloc(); | |
1392 | if (!sock) { | |
e87cc472 | 1393 | net_warn_ratelimited("socket: no more sockets\n"); |
55737fda SH |
1394 | return -ENFILE; /* Not exactly a match, but its the |
1395 | closest posix thing */ | |
1396 | } | |
1397 | ||
1398 | sock->type = type; | |
1399 | ||
95a5afca | 1400 | #ifdef CONFIG_MODULES |
89bddce5 SH |
1401 | /* Attempt to load a protocol module if the find failed. |
1402 | * | |
1403 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1404 | * requested real, full-featured networking support upon configuration. |
1405 | * Otherwise module support will break! | |
1406 | */ | |
190683a9 | 1407 | if (rcu_access_pointer(net_families[family]) == NULL) |
89bddce5 | 1408 | request_module("net-pf-%d", family); |
1da177e4 LT |
1409 | #endif |
1410 | ||
55737fda SH |
1411 | rcu_read_lock(); |
1412 | pf = rcu_dereference(net_families[family]); | |
1413 | err = -EAFNOSUPPORT; | |
1414 | if (!pf) | |
1415 | goto out_release; | |
1da177e4 LT |
1416 | |
1417 | /* | |
1418 | * We will call the ->create function, that possibly is in a loadable | |
1419 | * module, so we have to bump that loadable module refcnt first. | |
1420 | */ | |
55737fda | 1421 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1422 | goto out_release; |
1423 | ||
55737fda SH |
1424 | /* Now protected by module ref count */ |
1425 | rcu_read_unlock(); | |
1426 | ||
3f378b68 | 1427 | err = pf->create(net, sock, protocol, kern); |
55737fda | 1428 | if (err < 0) |
1da177e4 | 1429 | goto out_module_put; |
a79af59e | 1430 | |
1da177e4 LT |
1431 | /* |
1432 | * Now to bump the refcnt of the [loadable] module that owns this | |
1433 | * socket at sock_release time we decrement its refcnt. | |
1434 | */ | |
55737fda SH |
1435 | if (!try_module_get(sock->ops->owner)) |
1436 | goto out_module_busy; | |
1437 | ||
1da177e4 LT |
1438 | /* |
1439 | * Now that we're done with the ->create function, the [loadable] | |
1440 | * module can have its refcnt decremented | |
1441 | */ | |
55737fda | 1442 | module_put(pf->owner); |
7420ed23 VY |
1443 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1444 | if (err) | |
3b185525 | 1445 | goto out_sock_release; |
55737fda | 1446 | *res = sock; |
1da177e4 | 1447 | |
55737fda SH |
1448 | return 0; |
1449 | ||
1450 | out_module_busy: | |
1451 | err = -EAFNOSUPPORT; | |
1da177e4 | 1452 | out_module_put: |
55737fda SH |
1453 | sock->ops = NULL; |
1454 | module_put(pf->owner); | |
1455 | out_sock_release: | |
1da177e4 | 1456 | sock_release(sock); |
55737fda SH |
1457 | return err; |
1458 | ||
1459 | out_release: | |
1460 | rcu_read_unlock(); | |
1461 | goto out_sock_release; | |
1da177e4 | 1462 | } |
721db93a | 1463 | EXPORT_SYMBOL(__sock_create); |
1da177e4 | 1464 | |
8a3c245c PT |
1465 | /** |
1466 | * sock_create - creates a socket | |
1467 | * @family: protocol family (AF_INET, ...) | |
1468 | * @type: communication type (SOCK_STREAM, ...) | |
1469 | * @protocol: protocol (0, ...) | |
1470 | * @res: new socket | |
1471 | * | |
1472 | * A wrapper around __sock_create(). | |
1473 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1474 | */ | |
1475 | ||
1da177e4 LT |
1476 | int sock_create(int family, int type, int protocol, struct socket **res) |
1477 | { | |
1b8d7ae4 | 1478 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 | 1479 | } |
c6d409cf | 1480 | EXPORT_SYMBOL(sock_create); |
1da177e4 | 1481 | |
8a3c245c PT |
1482 | /** |
1483 | * sock_create_kern - creates a socket (kernel space) | |
1484 | * @net: net namespace | |
1485 | * @family: protocol family (AF_INET, ...) | |
1486 | * @type: communication type (SOCK_STREAM, ...) | |
1487 | * @protocol: protocol (0, ...) | |
1488 | * @res: new socket | |
1489 | * | |
1490 | * A wrapper around __sock_create(). | |
1491 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1492 | */ | |
1493 | ||
eeb1bd5c | 1494 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) |
1da177e4 | 1495 | { |
eeb1bd5c | 1496 | return __sock_create(net, family, type, protocol, res, 1); |
1da177e4 | 1497 | } |
c6d409cf | 1498 | EXPORT_SYMBOL(sock_create_kern); |
1da177e4 | 1499 | |
9d6a15c3 | 1500 | int __sys_socket(int family, int type, int protocol) |
1da177e4 LT |
1501 | { |
1502 | int retval; | |
1503 | struct socket *sock; | |
a677a039 UD |
1504 | int flags; |
1505 | ||
e38b36f3 UD |
1506 | /* Check the SOCK_* constants for consistency. */ |
1507 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1508 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1509 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1510 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1511 | ||
a677a039 | 1512 | flags = type & ~SOCK_TYPE_MASK; |
77d27200 | 1513 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1514 | return -EINVAL; |
1515 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1516 | |
aaca0bdc UD |
1517 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1518 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1519 | ||
1da177e4 LT |
1520 | retval = sock_create(family, type, protocol, &sock); |
1521 | if (retval < 0) | |
8e1611e2 | 1522 | return retval; |
1da177e4 | 1523 | |
8e1611e2 | 1524 | return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1da177e4 LT |
1525 | } |
1526 | ||
9d6a15c3 DB |
1527 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
1528 | { | |
1529 | return __sys_socket(family, type, protocol); | |
1530 | } | |
1531 | ||
1da177e4 LT |
1532 | /* |
1533 | * Create a pair of connected sockets. | |
1534 | */ | |
1535 | ||
6debc8d8 | 1536 | int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) |
1da177e4 LT |
1537 | { |
1538 | struct socket *sock1, *sock2; | |
1539 | int fd1, fd2, err; | |
db349509 | 1540 | struct file *newfile1, *newfile2; |
a677a039 UD |
1541 | int flags; |
1542 | ||
1543 | flags = type & ~SOCK_TYPE_MASK; | |
77d27200 | 1544 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1545 | return -EINVAL; |
1546 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1547 | |
aaca0bdc UD |
1548 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1549 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1550 | ||
016a266b AV |
1551 | /* |
1552 | * reserve descriptors and make sure we won't fail | |
1553 | * to return them to userland. | |
1554 | */ | |
1555 | fd1 = get_unused_fd_flags(flags); | |
1556 | if (unlikely(fd1 < 0)) | |
1557 | return fd1; | |
1558 | ||
1559 | fd2 = get_unused_fd_flags(flags); | |
1560 | if (unlikely(fd2 < 0)) { | |
1561 | put_unused_fd(fd1); | |
1562 | return fd2; | |
1563 | } | |
1564 | ||
1565 | err = put_user(fd1, &usockvec[0]); | |
1566 | if (err) | |
1567 | goto out; | |
1568 | ||
1569 | err = put_user(fd2, &usockvec[1]); | |
1570 | if (err) | |
1571 | goto out; | |
1572 | ||
1da177e4 LT |
1573 | /* |
1574 | * Obtain the first socket and check if the underlying protocol | |
1575 | * supports the socketpair call. | |
1576 | */ | |
1577 | ||
1578 | err = sock_create(family, type, protocol, &sock1); | |
016a266b | 1579 | if (unlikely(err < 0)) |
1da177e4 LT |
1580 | goto out; |
1581 | ||
1582 | err = sock_create(family, type, protocol, &sock2); | |
016a266b AV |
1583 | if (unlikely(err < 0)) { |
1584 | sock_release(sock1); | |
1585 | goto out; | |
bf3c23d1 | 1586 | } |
d73aa286 | 1587 | |
d47cd945 DH |
1588 | err = security_socket_socketpair(sock1, sock2); |
1589 | if (unlikely(err)) { | |
1590 | sock_release(sock2); | |
1591 | sock_release(sock1); | |
1592 | goto out; | |
1593 | } | |
1594 | ||
016a266b AV |
1595 | err = sock1->ops->socketpair(sock1, sock2); |
1596 | if (unlikely(err < 0)) { | |
1597 | sock_release(sock2); | |
1598 | sock_release(sock1); | |
1599 | goto out; | |
28407630 AV |
1600 | } |
1601 | ||
aab174f0 | 1602 | newfile1 = sock_alloc_file(sock1, flags, NULL); |
b5ffe634 | 1603 | if (IS_ERR(newfile1)) { |
28407630 | 1604 | err = PTR_ERR(newfile1); |
016a266b AV |
1605 | sock_release(sock2); |
1606 | goto out; | |
28407630 AV |
1607 | } |
1608 | ||
aab174f0 | 1609 | newfile2 = sock_alloc_file(sock2, flags, NULL); |
28407630 AV |
1610 | if (IS_ERR(newfile2)) { |
1611 | err = PTR_ERR(newfile2); | |
016a266b AV |
1612 | fput(newfile1); |
1613 | goto out; | |
db349509 AV |
1614 | } |
1615 | ||
157cf649 | 1616 | audit_fd_pair(fd1, fd2); |
d73aa286 | 1617 | |
db349509 AV |
1618 | fd_install(fd1, newfile1); |
1619 | fd_install(fd2, newfile2); | |
d73aa286 | 1620 | return 0; |
1da177e4 | 1621 | |
016a266b | 1622 | out: |
d73aa286 | 1623 | put_unused_fd(fd2); |
d73aa286 | 1624 | put_unused_fd(fd1); |
1da177e4 LT |
1625 | return err; |
1626 | } | |
1627 | ||
6debc8d8 DB |
1628 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
1629 | int __user *, usockvec) | |
1630 | { | |
1631 | return __sys_socketpair(family, type, protocol, usockvec); | |
1632 | } | |
1633 | ||
1da177e4 LT |
1634 | /* |
1635 | * Bind a name to a socket. Nothing much to do here since it's | |
1636 | * the protocol's responsibility to handle the local address. | |
1637 | * | |
1638 | * We move the socket address to kernel space before we call | |
1639 | * the protocol layer (having also checked the address is ok). | |
1640 | */ | |
1641 | ||
a87d35d8 | 1642 | int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
1da177e4 LT |
1643 | { |
1644 | struct socket *sock; | |
230b1839 | 1645 | struct sockaddr_storage address; |
6cb153ca | 1646 | int err, fput_needed; |
1da177e4 | 1647 | |
89bddce5 | 1648 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1649 | if (sock) { |
43db362d | 1650 | err = move_addr_to_kernel(umyaddr, addrlen, &address); |
068b88cc | 1651 | if (!err) { |
89bddce5 | 1652 | err = security_socket_bind(sock, |
230b1839 | 1653 | (struct sockaddr *)&address, |
89bddce5 | 1654 | addrlen); |
6cb153ca BL |
1655 | if (!err) |
1656 | err = sock->ops->bind(sock, | |
89bddce5 | 1657 | (struct sockaddr *) |
230b1839 | 1658 | &address, addrlen); |
1da177e4 | 1659 | } |
6cb153ca | 1660 | fput_light(sock->file, fput_needed); |
89bddce5 | 1661 | } |
1da177e4 LT |
1662 | return err; |
1663 | } | |
1664 | ||
a87d35d8 DB |
1665 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
1666 | { | |
1667 | return __sys_bind(fd, umyaddr, addrlen); | |
1668 | } | |
1669 | ||
1da177e4 LT |
1670 | /* |
1671 | * Perform a listen. Basically, we allow the protocol to do anything | |
1672 | * necessary for a listen, and if that works, we mark the socket as | |
1673 | * ready for listening. | |
1674 | */ | |
1675 | ||
25e290ee | 1676 | int __sys_listen(int fd, int backlog) |
1da177e4 LT |
1677 | { |
1678 | struct socket *sock; | |
6cb153ca | 1679 | int err, fput_needed; |
b8e1f9b5 | 1680 | int somaxconn; |
89bddce5 SH |
1681 | |
1682 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1683 | if (sock) { | |
8efa6e93 | 1684 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; |
95c96174 | 1685 | if ((unsigned int)backlog > somaxconn) |
b8e1f9b5 | 1686 | backlog = somaxconn; |
1da177e4 LT |
1687 | |
1688 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1689 | if (!err) |
1690 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1691 | |
6cb153ca | 1692 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1693 | } |
1694 | return err; | |
1695 | } | |
1696 | ||
25e290ee DB |
1697 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
1698 | { | |
1699 | return __sys_listen(fd, backlog); | |
1700 | } | |
1701 | ||
de2ea4b6 JA |
1702 | int __sys_accept4_file(struct file *file, unsigned file_flags, |
1703 | struct sockaddr __user *upeer_sockaddr, | |
09952e3e JA |
1704 | int __user *upeer_addrlen, int flags, |
1705 | unsigned long nofile) | |
1da177e4 LT |
1706 | { |
1707 | struct socket *sock, *newsock; | |
39d8c1b6 | 1708 | struct file *newfile; |
de2ea4b6 | 1709 | int err, len, newfd; |
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 | ||
de2ea4b6 | 1718 | sock = sock_from_file(file, &err); |
1da177e4 LT |
1719 | if (!sock) |
1720 | goto out; | |
1721 | ||
1722 | err = -ENFILE; | |
c6d409cf ED |
1723 | newsock = sock_alloc(); |
1724 | if (!newsock) | |
de2ea4b6 | 1725 | goto out; |
1da177e4 LT |
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 | ||
09952e3e | 1736 | newfd = __get_unused_fd_flags(flags, nofile); |
39d8c1b6 DM |
1737 | if (unlikely(newfd < 0)) { |
1738 | err = newfd; | |
9a1875e6 | 1739 | sock_release(newsock); |
de2ea4b6 | 1740 | goto out; |
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); | |
de2ea4b6 | 1746 | goto out; |
28407630 | 1747 | } |
39d8c1b6 | 1748 | |
a79af59e FF |
1749 | err = security_socket_accept(sock, newsock); |
1750 | if (err) | |
39d8c1b6 | 1751 | goto out_fd; |
a79af59e | 1752 | |
de2ea4b6 JA |
1753 | err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags, |
1754 | false); | |
1da177e4 | 1755 | if (err < 0) |
39d8c1b6 | 1756 | goto out_fd; |
1da177e4 LT |
1757 | |
1758 | if (upeer_sockaddr) { | |
9b2c45d4 DV |
1759 | len = newsock->ops->getname(newsock, |
1760 | (struct sockaddr *)&address, 2); | |
1761 | if (len < 0) { | |
1da177e4 | 1762 | err = -ECONNABORTED; |
39d8c1b6 | 1763 | goto out_fd; |
1da177e4 | 1764 | } |
43db362d | 1765 | err = move_addr_to_user(&address, |
230b1839 | 1766 | len, upeer_sockaddr, upeer_addrlen); |
1da177e4 | 1767 | if (err < 0) |
39d8c1b6 | 1768 | goto out_fd; |
1da177e4 LT |
1769 | } |
1770 | ||
1771 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1772 | ||
39d8c1b6 DM |
1773 | fd_install(newfd, newfile); |
1774 | err = newfd; | |
1da177e4 LT |
1775 | out: |
1776 | return err; | |
39d8c1b6 | 1777 | out_fd: |
9606a216 | 1778 | fput(newfile); |
39d8c1b6 | 1779 | put_unused_fd(newfd); |
de2ea4b6 JA |
1780 | goto out; |
1781 | ||
1782 | } | |
1783 | ||
1784 | /* | |
1785 | * For accept, we attempt to create a new socket, set up the link | |
1786 | * with the client, wake up the client, then return the new | |
1787 | * connected fd. We collect the address of the connector in kernel | |
1788 | * space and move it to user at the very end. This is unclean because | |
1789 | * we open the socket then return an error. | |
1790 | * | |
1791 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1792 | * status to recvmsg. We need to add that support in a way thats | |
1793 | * clean when we restructure accept also. | |
1794 | */ | |
1795 | ||
1796 | int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, | |
1797 | int __user *upeer_addrlen, int flags) | |
1798 | { | |
1799 | int ret = -EBADF; | |
1800 | struct fd f; | |
1801 | ||
1802 | f = fdget(fd); | |
1803 | if (f.file) { | |
1804 | ret = __sys_accept4_file(f.file, 0, upeer_sockaddr, | |
09952e3e JA |
1805 | upeer_addrlen, flags, |
1806 | rlimit(RLIMIT_NOFILE)); | |
de2ea4b6 JA |
1807 | if (f.flags) |
1808 | fput(f.file); | |
1809 | } | |
1810 | ||
1811 | return ret; | |
1da177e4 LT |
1812 | } |
1813 | ||
4541e805 DB |
1814 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1815 | int __user *, upeer_addrlen, int, flags) | |
1816 | { | |
1817 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); | |
1818 | } | |
1819 | ||
20f37034 HC |
1820 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1821 | int __user *, upeer_addrlen) | |
aaca0bdc | 1822 | { |
4541e805 | 1823 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
aaca0bdc UD |
1824 | } |
1825 | ||
1da177e4 LT |
1826 | /* |
1827 | * Attempt to connect to a socket with the server address. The address | |
1828 | * is in user space so we verify it is OK and move it to kernel space. | |
1829 | * | |
1830 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1831 | * break bindings | |
1832 | * | |
1833 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1834 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1835 | * include the -EINPROGRESS status for such sockets. | |
1836 | */ | |
1837 | ||
f499a021 | 1838 | int __sys_connect_file(struct file *file, struct sockaddr_storage *address, |
bd3ded31 | 1839 | int addrlen, int file_flags) |
1da177e4 LT |
1840 | { |
1841 | struct socket *sock; | |
bd3ded31 | 1842 | int err; |
1da177e4 | 1843 | |
bd3ded31 | 1844 | sock = sock_from_file(file, &err); |
1da177e4 LT |
1845 | if (!sock) |
1846 | goto out; | |
1da177e4 | 1847 | |
89bddce5 | 1848 | err = |
f499a021 | 1849 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); |
1da177e4 | 1850 | if (err) |
bd3ded31 | 1851 | goto out; |
1da177e4 | 1852 | |
f499a021 | 1853 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
bd3ded31 | 1854 | sock->file->f_flags | file_flags); |
1da177e4 LT |
1855 | out: |
1856 | return err; | |
1857 | } | |
1858 | ||
bd3ded31 JA |
1859 | int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) |
1860 | { | |
1861 | int ret = -EBADF; | |
1862 | struct fd f; | |
1863 | ||
1864 | f = fdget(fd); | |
1865 | if (f.file) { | |
f499a021 JA |
1866 | struct sockaddr_storage address; |
1867 | ||
1868 | ret = move_addr_to_kernel(uservaddr, addrlen, &address); | |
1869 | if (!ret) | |
1870 | ret = __sys_connect_file(f.file, &address, addrlen, 0); | |
bd3ded31 JA |
1871 | if (f.flags) |
1872 | fput(f.file); | |
1873 | } | |
1874 | ||
1875 | return ret; | |
1876 | } | |
1877 | ||
1387c2c2 DB |
1878 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
1879 | int, addrlen) | |
1880 | { | |
1881 | return __sys_connect(fd, uservaddr, addrlen); | |
1882 | } | |
1883 | ||
1da177e4 LT |
1884 | /* |
1885 | * Get the local address ('name') of a socket object. Move the obtained | |
1886 | * name to user space. | |
1887 | */ | |
1888 | ||
8882a107 DB |
1889 | int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1890 | int __user *usockaddr_len) | |
1da177e4 LT |
1891 | { |
1892 | struct socket *sock; | |
230b1839 | 1893 | struct sockaddr_storage address; |
9b2c45d4 | 1894 | int err, fput_needed; |
89bddce5 | 1895 | |
6cb153ca | 1896 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1897 | if (!sock) |
1898 | goto out; | |
1899 | ||
1900 | err = security_socket_getsockname(sock); | |
1901 | if (err) | |
1902 | goto out_put; | |
1903 | ||
9b2c45d4 DV |
1904 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); |
1905 | if (err < 0) | |
1da177e4 | 1906 | goto out_put; |
9b2c45d4 DV |
1907 | /* "err" is actually length in this case */ |
1908 | err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); | |
1da177e4 LT |
1909 | |
1910 | out_put: | |
6cb153ca | 1911 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1912 | out: |
1913 | return err; | |
1914 | } | |
1915 | ||
8882a107 DB |
1916 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
1917 | int __user *, usockaddr_len) | |
1918 | { | |
1919 | return __sys_getsockname(fd, usockaddr, usockaddr_len); | |
1920 | } | |
1921 | ||
1da177e4 LT |
1922 | /* |
1923 | * Get the remote address ('name') of a socket object. Move the obtained | |
1924 | * name to user space. | |
1925 | */ | |
1926 | ||
b21c8f83 DB |
1927 | int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1928 | int __user *usockaddr_len) | |
1da177e4 LT |
1929 | { |
1930 | struct socket *sock; | |
230b1839 | 1931 | struct sockaddr_storage address; |
9b2c45d4 | 1932 | int err, fput_needed; |
1da177e4 | 1933 | |
89bddce5 SH |
1934 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1935 | if (sock != NULL) { | |
1da177e4 LT |
1936 | err = security_socket_getpeername(sock); |
1937 | if (err) { | |
6cb153ca | 1938 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1939 | return err; |
1940 | } | |
1941 | ||
9b2c45d4 DV |
1942 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); |
1943 | if (err >= 0) | |
1944 | /* "err" is actually length in this case */ | |
1945 | err = move_addr_to_user(&address, err, usockaddr, | |
89bddce5 | 1946 | usockaddr_len); |
6cb153ca | 1947 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1948 | } |
1949 | return err; | |
1950 | } | |
1951 | ||
b21c8f83 DB |
1952 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
1953 | int __user *, usockaddr_len) | |
1954 | { | |
1955 | return __sys_getpeername(fd, usockaddr, usockaddr_len); | |
1956 | } | |
1957 | ||
1da177e4 LT |
1958 | /* |
1959 | * Send a datagram to a given address. We move the address into kernel | |
1960 | * space and check the user space data area is readable before invoking | |
1961 | * the protocol. | |
1962 | */ | |
211b634b DB |
1963 | int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, |
1964 | struct sockaddr __user *addr, int addr_len) | |
1da177e4 LT |
1965 | { |
1966 | struct socket *sock; | |
230b1839 | 1967 | struct sockaddr_storage address; |
1da177e4 LT |
1968 | int err; |
1969 | struct msghdr msg; | |
1970 | struct iovec iov; | |
6cb153ca | 1971 | int fput_needed; |
6cb153ca | 1972 | |
602bd0e9 AV |
1973 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); |
1974 | if (unlikely(err)) | |
1975 | return err; | |
de0fa95c PE |
1976 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1977 | if (!sock) | |
4387ff75 | 1978 | goto out; |
6cb153ca | 1979 | |
89bddce5 | 1980 | msg.msg_name = NULL; |
89bddce5 SH |
1981 | msg.msg_control = NULL; |
1982 | msg.msg_controllen = 0; | |
1983 | msg.msg_namelen = 0; | |
6cb153ca | 1984 | if (addr) { |
43db362d | 1985 | err = move_addr_to_kernel(addr, addr_len, &address); |
1da177e4 LT |
1986 | if (err < 0) |
1987 | goto out_put; | |
230b1839 | 1988 | msg.msg_name = (struct sockaddr *)&address; |
89bddce5 | 1989 | msg.msg_namelen = addr_len; |
1da177e4 LT |
1990 | } |
1991 | if (sock->file->f_flags & O_NONBLOCK) | |
1992 | flags |= MSG_DONTWAIT; | |
1993 | msg.msg_flags = flags; | |
d8725c86 | 1994 | err = sock_sendmsg(sock, &msg); |
1da177e4 | 1995 | |
89bddce5 | 1996 | out_put: |
de0fa95c | 1997 | fput_light(sock->file, fput_needed); |
4387ff75 | 1998 | out: |
1da177e4 LT |
1999 | return err; |
2000 | } | |
2001 | ||
211b634b DB |
2002 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
2003 | unsigned int, flags, struct sockaddr __user *, addr, | |
2004 | int, addr_len) | |
2005 | { | |
2006 | return __sys_sendto(fd, buff, len, flags, addr, addr_len); | |
2007 | } | |
2008 | ||
1da177e4 | 2009 | /* |
89bddce5 | 2010 | * Send a datagram down a socket. |
1da177e4 LT |
2011 | */ |
2012 | ||
3e0fa65f | 2013 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
95c96174 | 2014 | unsigned int, flags) |
1da177e4 | 2015 | { |
211b634b | 2016 | return __sys_sendto(fd, buff, len, flags, NULL, 0); |
1da177e4 LT |
2017 | } |
2018 | ||
2019 | /* | |
89bddce5 | 2020 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
2021 | * sender. We verify the buffers are writable and if needed move the |
2022 | * sender address from kernel to user space. | |
2023 | */ | |
7a09e1eb DB |
2024 | int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, |
2025 | struct sockaddr __user *addr, int __user *addr_len) | |
1da177e4 LT |
2026 | { |
2027 | struct socket *sock; | |
2028 | struct iovec iov; | |
2029 | struct msghdr msg; | |
230b1839 | 2030 | struct sockaddr_storage address; |
89bddce5 | 2031 | int err, err2; |
6cb153ca BL |
2032 | int fput_needed; |
2033 | ||
602bd0e9 AV |
2034 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); |
2035 | if (unlikely(err)) | |
2036 | return err; | |
de0fa95c | 2037 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 2038 | if (!sock) |
de0fa95c | 2039 | goto out; |
1da177e4 | 2040 | |
89bddce5 SH |
2041 | msg.msg_control = NULL; |
2042 | msg.msg_controllen = 0; | |
f3d33426 HFS |
2043 | /* Save some cycles and don't copy the address if not needed */ |
2044 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; | |
2045 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
2046 | msg.msg_namelen = 0; | |
130ed5d1 | 2047 | msg.msg_iocb = NULL; |
9f138fa6 | 2048 | msg.msg_flags = 0; |
1da177e4 LT |
2049 | if (sock->file->f_flags & O_NONBLOCK) |
2050 | flags |= MSG_DONTWAIT; | |
2da62906 | 2051 | err = sock_recvmsg(sock, &msg, flags); |
1da177e4 | 2052 | |
89bddce5 | 2053 | if (err >= 0 && addr != NULL) { |
43db362d | 2054 | err2 = move_addr_to_user(&address, |
230b1839 | 2055 | msg.msg_namelen, addr, addr_len); |
89bddce5 SH |
2056 | if (err2 < 0) |
2057 | err = err2; | |
1da177e4 | 2058 | } |
de0fa95c PE |
2059 | |
2060 | fput_light(sock->file, fput_needed); | |
4387ff75 | 2061 | out: |
1da177e4 LT |
2062 | return err; |
2063 | } | |
2064 | ||
7a09e1eb DB |
2065 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
2066 | unsigned int, flags, struct sockaddr __user *, addr, | |
2067 | int __user *, addr_len) | |
2068 | { | |
2069 | return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); | |
2070 | } | |
2071 | ||
1da177e4 | 2072 | /* |
89bddce5 | 2073 | * Receive a datagram from a socket. |
1da177e4 LT |
2074 | */ |
2075 | ||
b7c0ddf5 JG |
2076 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, |
2077 | unsigned int, flags) | |
1da177e4 | 2078 | { |
7a09e1eb | 2079 | return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1da177e4 LT |
2080 | } |
2081 | ||
83f0c10b FW |
2082 | static bool sock_use_custom_sol_socket(const struct socket *sock) |
2083 | { | |
2084 | const struct sock *sk = sock->sk; | |
2085 | ||
2086 | /* Use sock->ops->setsockopt() for MPTCP */ | |
2087 | return IS_ENABLED(CONFIG_MPTCP) && | |
2088 | sk->sk_protocol == IPPROTO_MPTCP && | |
2089 | sk->sk_type == SOCK_STREAM && | |
2090 | (sk->sk_family == AF_INET || sk->sk_family == AF_INET6); | |
2091 | } | |
2092 | ||
1da177e4 LT |
2093 | /* |
2094 | * Set a socket option. Because we don't know the option lengths we have | |
2095 | * to pass the user mode parameter for the protocols to sort out. | |
2096 | */ | |
55db9c0e CH |
2097 | int __sys_setsockopt(int fd, int level, int optname, char __user *optval, |
2098 | int optlen) | |
1da177e4 | 2099 | { |
0d01da6a SF |
2100 | mm_segment_t oldfs = get_fs(); |
2101 | char *kernel_optval = NULL; | |
6cb153ca | 2102 | int err, fput_needed; |
1da177e4 LT |
2103 | struct socket *sock; |
2104 | ||
2105 | if (optlen < 0) | |
2106 | return -EINVAL; | |
89bddce5 SH |
2107 | |
2108 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
4a367299 CH |
2109 | if (!sock) |
2110 | return err; | |
1da177e4 | 2111 | |
4a367299 CH |
2112 | err = security_socket_setsockopt(sock, level, optname); |
2113 | if (err) | |
2114 | goto out_put; | |
0d01da6a | 2115 | |
55db9c0e CH |
2116 | if (!in_compat_syscall()) |
2117 | err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname, | |
2118 | optval, &optlen, | |
2119 | &kernel_optval); | |
4a367299 CH |
2120 | if (err < 0) |
2121 | goto out_put; | |
2122 | if (err > 0) { | |
2123 | err = 0; | |
2124 | goto out_put; | |
2125 | } | |
0d01da6a | 2126 | |
4a367299 CH |
2127 | if (kernel_optval) { |
2128 | set_fs(KERNEL_DS); | |
2129 | optval = (char __user __force *)kernel_optval; | |
2130 | } | |
0d01da6a | 2131 | |
4a367299 | 2132 | if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock)) |
c8c1bbb6 CH |
2133 | err = sock_setsockopt(sock, level, optname, |
2134 | USER_SOCKPTR(optval), optlen); | |
a44d9e72 CH |
2135 | else if (unlikely(!sock->ops->setsockopt)) |
2136 | err = -EOPNOTSUPP; | |
4a367299 CH |
2137 | else |
2138 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
89bddce5 | 2139 | optlen); |
0d01da6a | 2140 | |
4a367299 CH |
2141 | if (kernel_optval) { |
2142 | set_fs(oldfs); | |
2143 | kfree(kernel_optval); | |
1da177e4 | 2144 | } |
4a367299 CH |
2145 | |
2146 | out_put: | |
2147 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2148 | return err; |
2149 | } | |
2150 | ||
cc36dca0 DB |
2151 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
2152 | char __user *, optval, int, optlen) | |
2153 | { | |
2154 | return __sys_setsockopt(fd, level, optname, optval, optlen); | |
2155 | } | |
2156 | ||
1da177e4 LT |
2157 | /* |
2158 | * Get a socket option. Because we don't know the option lengths we have | |
2159 | * to pass a user mode parameter for the protocols to sort out. | |
2160 | */ | |
55db9c0e CH |
2161 | int __sys_getsockopt(int fd, int level, int optname, char __user *optval, |
2162 | int __user *optlen) | |
1da177e4 | 2163 | { |
6cb153ca | 2164 | int err, fput_needed; |
1da177e4 | 2165 | struct socket *sock; |
0d01da6a | 2166 | int max_optlen; |
1da177e4 | 2167 | |
89bddce5 | 2168 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
d8a9b38f CH |
2169 | if (!sock) |
2170 | return err; | |
2171 | ||
2172 | err = security_socket_getsockopt(sock, level, optname); | |
2173 | if (err) | |
2174 | goto out_put; | |
1da177e4 | 2175 | |
55db9c0e CH |
2176 | if (!in_compat_syscall()) |
2177 | max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); | |
0d01da6a | 2178 | |
d8a9b38f CH |
2179 | if (level == SOL_SOCKET) |
2180 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
a44d9e72 CH |
2181 | else if (unlikely(!sock->ops->getsockopt)) |
2182 | err = -EOPNOTSUPP; | |
d8a9b38f CH |
2183 | else |
2184 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
89bddce5 | 2185 | optlen); |
0d01da6a | 2186 | |
55db9c0e CH |
2187 | if (!in_compat_syscall()) |
2188 | err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, | |
2189 | optval, optlen, max_optlen, | |
2190 | err); | |
6cb153ca | 2191 | out_put: |
d8a9b38f | 2192 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2193 | return err; |
2194 | } | |
2195 | ||
13a2d70e DB |
2196 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
2197 | char __user *, optval, int __user *, optlen) | |
2198 | { | |
2199 | return __sys_getsockopt(fd, level, optname, optval, optlen); | |
2200 | } | |
2201 | ||
1da177e4 LT |
2202 | /* |
2203 | * Shutdown a socket. | |
2204 | */ | |
2205 | ||
005a1aea | 2206 | int __sys_shutdown(int fd, int how) |
1da177e4 | 2207 | { |
6cb153ca | 2208 | int err, fput_needed; |
1da177e4 LT |
2209 | struct socket *sock; |
2210 | ||
89bddce5 SH |
2211 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2212 | if (sock != NULL) { | |
1da177e4 | 2213 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
2214 | if (!err) |
2215 | err = sock->ops->shutdown(sock, how); | |
2216 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2217 | } |
2218 | return err; | |
2219 | } | |
2220 | ||
005a1aea DB |
2221 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
2222 | { | |
2223 | return __sys_shutdown(fd, how); | |
2224 | } | |
2225 | ||
89bddce5 | 2226 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
2227 | * fields which are the same type (int / unsigned) on our platforms. |
2228 | */ | |
2229 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
2230 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
2231 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
2232 | ||
c71d8ebe TH |
2233 | struct used_address { |
2234 | struct sockaddr_storage name; | |
2235 | unsigned int name_len; | |
2236 | }; | |
2237 | ||
0a384abf JA |
2238 | int __copy_msghdr_from_user(struct msghdr *kmsg, |
2239 | struct user_msghdr __user *umsg, | |
2240 | struct sockaddr __user **save_addr, | |
2241 | struct iovec __user **uiov, size_t *nsegs) | |
1661bf36 | 2242 | { |
ffb07550 | 2243 | struct user_msghdr msg; |
08adb7da AV |
2244 | ssize_t err; |
2245 | ||
ffb07550 | 2246 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) |
1661bf36 | 2247 | return -EFAULT; |
dbb490b9 | 2248 | |
1f466e1f CH |
2249 | kmsg->msg_control_is_user = true; |
2250 | kmsg->msg_control_user = msg.msg_control; | |
ffb07550 AV |
2251 | kmsg->msg_controllen = msg.msg_controllen; |
2252 | kmsg->msg_flags = msg.msg_flags; | |
2253 | ||
2254 | kmsg->msg_namelen = msg.msg_namelen; | |
2255 | if (!msg.msg_name) | |
6a2a2b3a AS |
2256 | kmsg->msg_namelen = 0; |
2257 | ||
dbb490b9 ML |
2258 | if (kmsg->msg_namelen < 0) |
2259 | return -EINVAL; | |
2260 | ||
1661bf36 | 2261 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
db31c55a | 2262 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); |
08adb7da AV |
2263 | |
2264 | if (save_addr) | |
ffb07550 | 2265 | *save_addr = msg.msg_name; |
08adb7da | 2266 | |
ffb07550 | 2267 | if (msg.msg_name && kmsg->msg_namelen) { |
08adb7da | 2268 | if (!save_addr) { |
864d9664 PA |
2269 | err = move_addr_to_kernel(msg.msg_name, |
2270 | kmsg->msg_namelen, | |
08adb7da AV |
2271 | kmsg->msg_name); |
2272 | if (err < 0) | |
2273 | return err; | |
2274 | } | |
2275 | } else { | |
2276 | kmsg->msg_name = NULL; | |
2277 | kmsg->msg_namelen = 0; | |
2278 | } | |
2279 | ||
ffb07550 | 2280 | if (msg.msg_iovlen > UIO_MAXIOV) |
08adb7da AV |
2281 | return -EMSGSIZE; |
2282 | ||
0345f931 | 2283 | kmsg->msg_iocb = NULL; |
0a384abf JA |
2284 | *uiov = msg.msg_iov; |
2285 | *nsegs = msg.msg_iovlen; | |
2286 | return 0; | |
2287 | } | |
2288 | ||
2289 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
2290 | struct user_msghdr __user *umsg, | |
2291 | struct sockaddr __user **save_addr, | |
2292 | struct iovec **iov) | |
2293 | { | |
2294 | struct user_msghdr msg; | |
2295 | ssize_t err; | |
2296 | ||
2297 | err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov, | |
2298 | &msg.msg_iovlen); | |
2299 | if (err) | |
2300 | return err; | |
0345f931 | 2301 | |
87e5e6da | 2302 | err = import_iovec(save_addr ? READ : WRITE, |
ffb07550 | 2303 | msg.msg_iov, msg.msg_iovlen, |
da184284 | 2304 | UIO_FASTIOV, iov, &kmsg->msg_iter); |
87e5e6da | 2305 | return err < 0 ? err : 0; |
1661bf36 DC |
2306 | } |
2307 | ||
4257c8ca JA |
2308 | static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys, |
2309 | unsigned int flags, struct used_address *used_address, | |
2310 | unsigned int allowed_msghdr_flags) | |
1da177e4 | 2311 | { |
b9d717a7 | 2312 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
846cc123 | 2313 | __aligned(sizeof(__kernel_size_t)); |
89bddce5 | 2314 | /* 20 is size of ipv6_pktinfo */ |
1da177e4 | 2315 | unsigned char *ctl_buf = ctl; |
d8725c86 | 2316 | int ctl_len; |
08adb7da | 2317 | ssize_t err; |
89bddce5 | 2318 | |
1da177e4 LT |
2319 | err = -ENOBUFS; |
2320 | ||
228e548e | 2321 | if (msg_sys->msg_controllen > INT_MAX) |
4257c8ca | 2322 | goto out; |
28a94d8f | 2323 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); |
228e548e | 2324 | ctl_len = msg_sys->msg_controllen; |
1da177e4 | 2325 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 | 2326 | err = |
228e548e | 2327 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
89bddce5 | 2328 | sizeof(ctl)); |
1da177e4 | 2329 | if (err) |
4257c8ca | 2330 | goto out; |
228e548e AB |
2331 | ctl_buf = msg_sys->msg_control; |
2332 | ctl_len = msg_sys->msg_controllen; | |
1da177e4 | 2333 | } else if (ctl_len) { |
ac4340fc DM |
2334 | BUILD_BUG_ON(sizeof(struct cmsghdr) != |
2335 | CMSG_ALIGN(sizeof(struct cmsghdr))); | |
89bddce5 | 2336 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 2337 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 2338 | if (ctl_buf == NULL) |
4257c8ca | 2339 | goto out; |
1da177e4 LT |
2340 | } |
2341 | err = -EFAULT; | |
1f466e1f | 2342 | if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len)) |
1da177e4 | 2343 | goto out_freectl; |
228e548e | 2344 | msg_sys->msg_control = ctl_buf; |
1f466e1f | 2345 | msg_sys->msg_control_is_user = false; |
1da177e4 | 2346 | } |
228e548e | 2347 | msg_sys->msg_flags = flags; |
1da177e4 LT |
2348 | |
2349 | if (sock->file->f_flags & O_NONBLOCK) | |
228e548e | 2350 | msg_sys->msg_flags |= MSG_DONTWAIT; |
c71d8ebe TH |
2351 | /* |
2352 | * If this is sendmmsg() and current destination address is same as | |
2353 | * previously succeeded address, omit asking LSM's decision. | |
2354 | * used_address->name_len is initialized to UINT_MAX so that the first | |
2355 | * destination address never matches. | |
2356 | */ | |
bc909d9d MD |
2357 | if (used_address && msg_sys->msg_name && |
2358 | used_address->name_len == msg_sys->msg_namelen && | |
2359 | !memcmp(&used_address->name, msg_sys->msg_name, | |
c71d8ebe | 2360 | used_address->name_len)) { |
d8725c86 | 2361 | err = sock_sendmsg_nosec(sock, msg_sys); |
c71d8ebe TH |
2362 | goto out_freectl; |
2363 | } | |
d8725c86 | 2364 | err = sock_sendmsg(sock, msg_sys); |
c71d8ebe TH |
2365 | /* |
2366 | * If this is sendmmsg() and sending to current destination address was | |
2367 | * successful, remember it. | |
2368 | */ | |
2369 | if (used_address && err >= 0) { | |
2370 | used_address->name_len = msg_sys->msg_namelen; | |
bc909d9d MD |
2371 | if (msg_sys->msg_name) |
2372 | memcpy(&used_address->name, msg_sys->msg_name, | |
2373 | used_address->name_len); | |
c71d8ebe | 2374 | } |
1da177e4 LT |
2375 | |
2376 | out_freectl: | |
89bddce5 | 2377 | if (ctl_buf != ctl) |
1da177e4 | 2378 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
4257c8ca JA |
2379 | out: |
2380 | return err; | |
2381 | } | |
2382 | ||
03b1230c JA |
2383 | int sendmsg_copy_msghdr(struct msghdr *msg, |
2384 | struct user_msghdr __user *umsg, unsigned flags, | |
2385 | struct iovec **iov) | |
4257c8ca JA |
2386 | { |
2387 | int err; | |
2388 | ||
2389 | if (flags & MSG_CMSG_COMPAT) { | |
2390 | struct compat_msghdr __user *msg_compat; | |
2391 | ||
2392 | msg_compat = (struct compat_msghdr __user *) umsg; | |
2393 | err = get_compat_msghdr(msg, msg_compat, NULL, iov); | |
2394 | } else { | |
2395 | err = copy_msghdr_from_user(msg, umsg, NULL, iov); | |
2396 | } | |
2397 | if (err < 0) | |
2398 | return err; | |
2399 | ||
2400 | return 0; | |
2401 | } | |
2402 | ||
2403 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2404 | struct msghdr *msg_sys, unsigned int flags, | |
2405 | struct used_address *used_address, | |
2406 | unsigned int allowed_msghdr_flags) | |
2407 | { | |
2408 | struct sockaddr_storage address; | |
2409 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2410 | ssize_t err; | |
2411 | ||
2412 | msg_sys->msg_name = &address; | |
2413 | ||
2414 | err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov); | |
2415 | if (err < 0) | |
2416 | return err; | |
2417 | ||
2418 | err = ____sys_sendmsg(sock, msg_sys, flags, used_address, | |
2419 | allowed_msghdr_flags); | |
da184284 | 2420 | kfree(iov); |
228e548e AB |
2421 | return err; |
2422 | } | |
2423 | ||
2424 | /* | |
2425 | * BSD sendmsg interface | |
2426 | */ | |
03b1230c | 2427 | long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg, |
0fa03c62 JA |
2428 | unsigned int flags) |
2429 | { | |
d69e0779 | 2430 | /* disallow ancillary data requests from this path */ |
03b1230c JA |
2431 | if (msg->msg_control || msg->msg_controllen) |
2432 | return -EINVAL; | |
d69e0779 | 2433 | |
03b1230c | 2434 | return ____sys_sendmsg(sock, msg, flags, NULL, 0); |
0fa03c62 | 2435 | } |
228e548e | 2436 | |
e1834a32 DB |
2437 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2438 | bool forbid_cmsg_compat) | |
228e548e AB |
2439 | { |
2440 | int fput_needed, err; | |
2441 | struct msghdr msg_sys; | |
1be374a0 AL |
2442 | struct socket *sock; |
2443 | ||
e1834a32 DB |
2444 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2445 | return -EINVAL; | |
2446 | ||
1be374a0 | 2447 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
228e548e AB |
2448 | if (!sock) |
2449 | goto out; | |
2450 | ||
28a94d8f | 2451 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); |
228e548e | 2452 | |
6cb153ca | 2453 | fput_light(sock->file, fput_needed); |
89bddce5 | 2454 | out: |
1da177e4 LT |
2455 | return err; |
2456 | } | |
2457 | ||
666547ff | 2458 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) |
a7526eb5 | 2459 | { |
e1834a32 | 2460 | return __sys_sendmsg(fd, msg, flags, true); |
a7526eb5 AL |
2461 | } |
2462 | ||
228e548e AB |
2463 | /* |
2464 | * Linux sendmmsg interface | |
2465 | */ | |
2466 | ||
2467 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
e1834a32 | 2468 | unsigned int flags, bool forbid_cmsg_compat) |
228e548e AB |
2469 | { |
2470 | int fput_needed, err, datagrams; | |
2471 | struct socket *sock; | |
2472 | struct mmsghdr __user *entry; | |
2473 | struct compat_mmsghdr __user *compat_entry; | |
2474 | struct msghdr msg_sys; | |
c71d8ebe | 2475 | struct used_address used_address; |
f092276d | 2476 | unsigned int oflags = flags; |
228e548e | 2477 | |
e1834a32 DB |
2478 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2479 | return -EINVAL; | |
2480 | ||
98382f41 AB |
2481 | if (vlen > UIO_MAXIOV) |
2482 | vlen = UIO_MAXIOV; | |
228e548e AB |
2483 | |
2484 | datagrams = 0; | |
2485 | ||
2486 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2487 | if (!sock) | |
2488 | return err; | |
2489 | ||
c71d8ebe | 2490 | used_address.name_len = UINT_MAX; |
228e548e AB |
2491 | entry = mmsg; |
2492 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
728ffb86 | 2493 | err = 0; |
f092276d | 2494 | flags |= MSG_BATCH; |
228e548e AB |
2495 | |
2496 | while (datagrams < vlen) { | |
f092276d TH |
2497 | if (datagrams == vlen - 1) |
2498 | flags = oflags; | |
2499 | ||
228e548e | 2500 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2501 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, |
28a94d8f | 2502 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2503 | if (err < 0) |
2504 | break; | |
2505 | err = __put_user(err, &compat_entry->msg_len); | |
2506 | ++compat_entry; | |
2507 | } else { | |
a7526eb5 | 2508 | err = ___sys_sendmsg(sock, |
666547ff | 2509 | (struct user_msghdr __user *)entry, |
28a94d8f | 2510 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2511 | if (err < 0) |
2512 | break; | |
2513 | err = put_user(err, &entry->msg_len); | |
2514 | ++entry; | |
2515 | } | |
2516 | ||
2517 | if (err) | |
2518 | break; | |
2519 | ++datagrams; | |
3023898b SHY |
2520 | if (msg_data_left(&msg_sys)) |
2521 | break; | |
a78cb84c | 2522 | cond_resched(); |
228e548e AB |
2523 | } |
2524 | ||
228e548e AB |
2525 | fput_light(sock->file, fput_needed); |
2526 | ||
728ffb86 AB |
2527 | /* We only return an error if no datagrams were able to be sent */ |
2528 | if (datagrams != 0) | |
228e548e AB |
2529 | return datagrams; |
2530 | ||
228e548e AB |
2531 | return err; |
2532 | } | |
2533 | ||
2534 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2535 | unsigned int, vlen, unsigned int, flags) | |
2536 | { | |
e1834a32 | 2537 | return __sys_sendmmsg(fd, mmsg, vlen, flags, true); |
228e548e AB |
2538 | } |
2539 | ||
03b1230c JA |
2540 | int recvmsg_copy_msghdr(struct msghdr *msg, |
2541 | struct user_msghdr __user *umsg, unsigned flags, | |
2542 | struct sockaddr __user **uaddr, | |
2543 | struct iovec **iov) | |
1da177e4 | 2544 | { |
08adb7da | 2545 | ssize_t err; |
1da177e4 | 2546 | |
4257c8ca JA |
2547 | if (MSG_CMSG_COMPAT & flags) { |
2548 | struct compat_msghdr __user *msg_compat; | |
1da177e4 | 2549 | |
4257c8ca JA |
2550 | msg_compat = (struct compat_msghdr __user *) umsg; |
2551 | err = get_compat_msghdr(msg, msg_compat, uaddr, iov); | |
2552 | } else { | |
2553 | err = copy_msghdr_from_user(msg, umsg, uaddr, iov); | |
2554 | } | |
1da177e4 | 2555 | if (err < 0) |
da184284 | 2556 | return err; |
1da177e4 | 2557 | |
4257c8ca JA |
2558 | return 0; |
2559 | } | |
2560 | ||
2561 | static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys, | |
2562 | struct user_msghdr __user *msg, | |
2563 | struct sockaddr __user *uaddr, | |
2564 | unsigned int flags, int nosec) | |
2565 | { | |
2566 | struct compat_msghdr __user *msg_compat = | |
2567 | (struct compat_msghdr __user *) msg; | |
2568 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2569 | struct sockaddr_storage addr; | |
2570 | unsigned long cmsg_ptr; | |
2571 | int len; | |
2572 | ssize_t err; | |
2573 | ||
2574 | msg_sys->msg_name = &addr; | |
a2e27255 ACM |
2575 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
2576 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
89bddce5 | 2577 | |
f3d33426 HFS |
2578 | /* We assume all kernel code knows the size of sockaddr_storage */ |
2579 | msg_sys->msg_namelen = 0; | |
2580 | ||
1da177e4 LT |
2581 | if (sock->file->f_flags & O_NONBLOCK) |
2582 | flags |= MSG_DONTWAIT; | |
1af66221 ED |
2583 | |
2584 | if (unlikely(nosec)) | |
2585 | err = sock_recvmsg_nosec(sock, msg_sys, flags); | |
2586 | else | |
2587 | err = sock_recvmsg(sock, msg_sys, flags); | |
2588 | ||
1da177e4 | 2589 | if (err < 0) |
4257c8ca | 2590 | goto out; |
1da177e4 LT |
2591 | len = err; |
2592 | ||
2593 | if (uaddr != NULL) { | |
43db362d | 2594 | err = move_addr_to_user(&addr, |
a2e27255 | 2595 | msg_sys->msg_namelen, uaddr, |
89bddce5 | 2596 | uaddr_len); |
1da177e4 | 2597 | if (err < 0) |
4257c8ca | 2598 | goto out; |
1da177e4 | 2599 | } |
a2e27255 | 2600 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
37f7f421 | 2601 | COMPAT_FLAGS(msg)); |
1da177e4 | 2602 | if (err) |
4257c8ca | 2603 | goto out; |
1da177e4 | 2604 | if (MSG_CMSG_COMPAT & flags) |
a2e27255 | 2605 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2606 | &msg_compat->msg_controllen); |
2607 | else | |
a2e27255 | 2608 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2609 | &msg->msg_controllen); |
2610 | if (err) | |
4257c8ca | 2611 | goto out; |
1da177e4 | 2612 | err = len; |
4257c8ca JA |
2613 | out: |
2614 | return err; | |
2615 | } | |
2616 | ||
2617 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2618 | struct msghdr *msg_sys, unsigned int flags, int nosec) | |
2619 | { | |
2620 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2621 | /* user mode address pointers */ | |
2622 | struct sockaddr __user *uaddr; | |
2623 | ssize_t err; | |
2624 | ||
2625 | err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov); | |
2626 | if (err < 0) | |
2627 | return err; | |
1da177e4 | 2628 | |
4257c8ca | 2629 | err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec); |
da184284 | 2630 | kfree(iov); |
a2e27255 ACM |
2631 | return err; |
2632 | } | |
2633 | ||
2634 | /* | |
2635 | * BSD recvmsg interface | |
2636 | */ | |
2637 | ||
03b1230c JA |
2638 | long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg, |
2639 | struct user_msghdr __user *umsg, | |
2640 | struct sockaddr __user *uaddr, unsigned int flags) | |
aa1fa28f | 2641 | { |
d69e0779 | 2642 | /* disallow ancillary data requests from this path */ |
03b1230c JA |
2643 | if (msg->msg_control || msg->msg_controllen) |
2644 | return -EINVAL; | |
aa1fa28f | 2645 | |
03b1230c | 2646 | return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0); |
aa1fa28f JA |
2647 | } |
2648 | ||
e1834a32 DB |
2649 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2650 | bool forbid_cmsg_compat) | |
a2e27255 ACM |
2651 | { |
2652 | int fput_needed, err; | |
2653 | struct msghdr msg_sys; | |
1be374a0 AL |
2654 | struct socket *sock; |
2655 | ||
e1834a32 DB |
2656 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2657 | return -EINVAL; | |
2658 | ||
1be374a0 | 2659 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
a2e27255 ACM |
2660 | if (!sock) |
2661 | goto out; | |
2662 | ||
a7526eb5 | 2663 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
a2e27255 | 2664 | |
6cb153ca | 2665 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2666 | out: |
2667 | return err; | |
2668 | } | |
2669 | ||
666547ff | 2670 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, |
a7526eb5 AL |
2671 | unsigned int, flags) |
2672 | { | |
e1834a32 | 2673 | return __sys_recvmsg(fd, msg, flags, true); |
a7526eb5 AL |
2674 | } |
2675 | ||
a2e27255 ACM |
2676 | /* |
2677 | * Linux recvmmsg interface | |
2678 | */ | |
2679 | ||
e11d4284 AB |
2680 | static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2681 | unsigned int vlen, unsigned int flags, | |
2682 | struct timespec64 *timeout) | |
a2e27255 ACM |
2683 | { |
2684 | int fput_needed, err, datagrams; | |
2685 | struct socket *sock; | |
2686 | struct mmsghdr __user *entry; | |
d7256d0e | 2687 | struct compat_mmsghdr __user *compat_entry; |
a2e27255 | 2688 | struct msghdr msg_sys; |
766b9f92 DD |
2689 | struct timespec64 end_time; |
2690 | struct timespec64 timeout64; | |
a2e27255 ACM |
2691 | |
2692 | if (timeout && | |
2693 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2694 | timeout->tv_nsec)) | |
2695 | return -EINVAL; | |
2696 | ||
2697 | datagrams = 0; | |
2698 | ||
2699 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2700 | if (!sock) | |
2701 | return err; | |
2702 | ||
7797dc41 SHY |
2703 | if (likely(!(flags & MSG_ERRQUEUE))) { |
2704 | err = sock_error(sock->sk); | |
2705 | if (err) { | |
2706 | datagrams = err; | |
2707 | goto out_put; | |
2708 | } | |
e623a9e9 | 2709 | } |
a2e27255 ACM |
2710 | |
2711 | entry = mmsg; | |
d7256d0e | 2712 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
a2e27255 ACM |
2713 | |
2714 | while (datagrams < vlen) { | |
2715 | /* | |
2716 | * No need to ask LSM for more than the first datagram. | |
2717 | */ | |
d7256d0e | 2718 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2719 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, |
a7526eb5 AL |
2720 | &msg_sys, flags & ~MSG_WAITFORONE, |
2721 | datagrams); | |
d7256d0e JMG |
2722 | if (err < 0) |
2723 | break; | |
2724 | err = __put_user(err, &compat_entry->msg_len); | |
2725 | ++compat_entry; | |
2726 | } else { | |
a7526eb5 | 2727 | err = ___sys_recvmsg(sock, |
666547ff | 2728 | (struct user_msghdr __user *)entry, |
a7526eb5 AL |
2729 | &msg_sys, flags & ~MSG_WAITFORONE, |
2730 | datagrams); | |
d7256d0e JMG |
2731 | if (err < 0) |
2732 | break; | |
2733 | err = put_user(err, &entry->msg_len); | |
2734 | ++entry; | |
2735 | } | |
2736 | ||
a2e27255 ACM |
2737 | if (err) |
2738 | break; | |
a2e27255 ACM |
2739 | ++datagrams; |
2740 | ||
71c5c159 BB |
2741 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
2742 | if (flags & MSG_WAITFORONE) | |
2743 | flags |= MSG_DONTWAIT; | |
2744 | ||
a2e27255 | 2745 | if (timeout) { |
766b9f92 | 2746 | ktime_get_ts64(&timeout64); |
c2e6c856 | 2747 | *timeout = timespec64_sub(end_time, timeout64); |
a2e27255 ACM |
2748 | if (timeout->tv_sec < 0) { |
2749 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2750 | break; | |
2751 | } | |
2752 | ||
2753 | /* Timeout, return less than vlen datagrams */ | |
2754 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2755 | break; | |
2756 | } | |
2757 | ||
2758 | /* Out of band data, return right away */ | |
2759 | if (msg_sys.msg_flags & MSG_OOB) | |
2760 | break; | |
a78cb84c | 2761 | cond_resched(); |
a2e27255 ACM |
2762 | } |
2763 | ||
a2e27255 | 2764 | if (err == 0) |
34b88a68 ACM |
2765 | goto out_put; |
2766 | ||
2767 | if (datagrams == 0) { | |
2768 | datagrams = err; | |
2769 | goto out_put; | |
2770 | } | |
a2e27255 | 2771 | |
34b88a68 ACM |
2772 | /* |
2773 | * We may return less entries than requested (vlen) if the | |
2774 | * sock is non block and there aren't enough datagrams... | |
2775 | */ | |
2776 | if (err != -EAGAIN) { | |
a2e27255 | 2777 | /* |
34b88a68 ACM |
2778 | * ... or if recvmsg returns an error after we |
2779 | * received some datagrams, where we record the | |
2780 | * error to return on the next call or if the | |
2781 | * app asks about it using getsockopt(SO_ERROR). | |
a2e27255 | 2782 | */ |
34b88a68 | 2783 | sock->sk->sk_err = -err; |
a2e27255 | 2784 | } |
34b88a68 ACM |
2785 | out_put: |
2786 | fput_light(sock->file, fput_needed); | |
a2e27255 | 2787 | |
34b88a68 | 2788 | return datagrams; |
a2e27255 ACM |
2789 | } |
2790 | ||
e11d4284 AB |
2791 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2792 | unsigned int vlen, unsigned int flags, | |
2793 | struct __kernel_timespec __user *timeout, | |
2794 | struct old_timespec32 __user *timeout32) | |
a2e27255 ACM |
2795 | { |
2796 | int datagrams; | |
c2e6c856 | 2797 | struct timespec64 timeout_sys; |
a2e27255 | 2798 | |
e11d4284 AB |
2799 | if (timeout && get_timespec64(&timeout_sys, timeout)) |
2800 | return -EFAULT; | |
a2e27255 | 2801 | |
e11d4284 | 2802 | if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) |
a2e27255 ACM |
2803 | return -EFAULT; |
2804 | ||
e11d4284 AB |
2805 | if (!timeout && !timeout32) |
2806 | return do_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2807 | ||
2808 | datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
a2e27255 | 2809 | |
e11d4284 AB |
2810 | if (datagrams <= 0) |
2811 | return datagrams; | |
2812 | ||
2813 | if (timeout && put_timespec64(&timeout_sys, timeout)) | |
2814 | datagrams = -EFAULT; | |
2815 | ||
2816 | if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) | |
a2e27255 ACM |
2817 | datagrams = -EFAULT; |
2818 | ||
2819 | return datagrams; | |
2820 | } | |
2821 | ||
1255e269 DB |
2822 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2823 | unsigned int, vlen, unsigned int, flags, | |
c2e6c856 | 2824 | struct __kernel_timespec __user *, timeout) |
1255e269 | 2825 | { |
e11d4284 AB |
2826 | if (flags & MSG_CMSG_COMPAT) |
2827 | return -EINVAL; | |
2828 | ||
2829 | return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); | |
2830 | } | |
2831 | ||
2832 | #ifdef CONFIG_COMPAT_32BIT_TIME | |
2833 | SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, | |
2834 | unsigned int, vlen, unsigned int, flags, | |
2835 | struct old_timespec32 __user *, timeout) | |
2836 | { | |
2837 | if (flags & MSG_CMSG_COMPAT) | |
2838 | return -EINVAL; | |
2839 | ||
2840 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); | |
1255e269 | 2841 | } |
e11d4284 | 2842 | #endif |
1255e269 | 2843 | |
a2e27255 | 2844 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
1da177e4 LT |
2845 | /* Argument list sizes for sys_socketcall */ |
2846 | #define AL(x) ((x) * sizeof(unsigned long)) | |
228e548e | 2847 | static const unsigned char nargs[21] = { |
c6d409cf ED |
2848 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
2849 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2850 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
228e548e | 2851 | AL(4), AL(5), AL(4) |
89bddce5 SH |
2852 | }; |
2853 | ||
1da177e4 LT |
2854 | #undef AL |
2855 | ||
2856 | /* | |
89bddce5 | 2857 | * System call vectors. |
1da177e4 LT |
2858 | * |
2859 | * Argument checking cleaned up. Saved 20% in size. | |
2860 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 2861 | * it is set by the callees. |
1da177e4 LT |
2862 | */ |
2863 | ||
3e0fa65f | 2864 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
1da177e4 | 2865 | { |
2950fa9d | 2866 | unsigned long a[AUDITSC_ARGS]; |
89bddce5 | 2867 | unsigned long a0, a1; |
1da177e4 | 2868 | int err; |
47379052 | 2869 | unsigned int len; |
1da177e4 | 2870 | |
228e548e | 2871 | if (call < 1 || call > SYS_SENDMMSG) |
1da177e4 | 2872 | return -EINVAL; |
c8e8cd57 | 2873 | call = array_index_nospec(call, SYS_SENDMMSG + 1); |
1da177e4 | 2874 | |
47379052 AV |
2875 | len = nargs[call]; |
2876 | if (len > sizeof(a)) | |
2877 | return -EINVAL; | |
2878 | ||
1da177e4 | 2879 | /* copy_from_user should be SMP safe. */ |
47379052 | 2880 | if (copy_from_user(a, args, len)) |
1da177e4 | 2881 | return -EFAULT; |
3ec3b2fb | 2882 | |
2950fa9d CG |
2883 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
2884 | if (err) | |
2885 | return err; | |
3ec3b2fb | 2886 | |
89bddce5 SH |
2887 | a0 = a[0]; |
2888 | a1 = a[1]; | |
2889 | ||
2890 | switch (call) { | |
2891 | case SYS_SOCKET: | |
9d6a15c3 | 2892 | err = __sys_socket(a0, a1, a[2]); |
89bddce5 SH |
2893 | break; |
2894 | case SYS_BIND: | |
a87d35d8 | 2895 | err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
2896 | break; |
2897 | case SYS_CONNECT: | |
1387c2c2 | 2898 | err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
2899 | break; |
2900 | case SYS_LISTEN: | |
25e290ee | 2901 | err = __sys_listen(a0, a1); |
89bddce5 SH |
2902 | break; |
2903 | case SYS_ACCEPT: | |
4541e805 DB |
2904 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
2905 | (int __user *)a[2], 0); | |
89bddce5 SH |
2906 | break; |
2907 | case SYS_GETSOCKNAME: | |
2908 | err = | |
8882a107 DB |
2909 | __sys_getsockname(a0, (struct sockaddr __user *)a1, |
2910 | (int __user *)a[2]); | |
89bddce5 SH |
2911 | break; |
2912 | case SYS_GETPEERNAME: | |
2913 | err = | |
b21c8f83 DB |
2914 | __sys_getpeername(a0, (struct sockaddr __user *)a1, |
2915 | (int __user *)a[2]); | |
89bddce5 SH |
2916 | break; |
2917 | case SYS_SOCKETPAIR: | |
6debc8d8 | 2918 | err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
89bddce5 SH |
2919 | break; |
2920 | case SYS_SEND: | |
f3bf896b DB |
2921 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2922 | NULL, 0); | |
89bddce5 SH |
2923 | break; |
2924 | case SYS_SENDTO: | |
211b634b DB |
2925 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2926 | (struct sockaddr __user *)a[4], a[5]); | |
89bddce5 SH |
2927 | break; |
2928 | case SYS_RECV: | |
d27e9afc DB |
2929 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2930 | NULL, NULL); | |
89bddce5 SH |
2931 | break; |
2932 | case SYS_RECVFROM: | |
7a09e1eb DB |
2933 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2934 | (struct sockaddr __user *)a[4], | |
2935 | (int __user *)a[5]); | |
89bddce5 SH |
2936 | break; |
2937 | case SYS_SHUTDOWN: | |
005a1aea | 2938 | err = __sys_shutdown(a0, a1); |
89bddce5 SH |
2939 | break; |
2940 | case SYS_SETSOCKOPT: | |
cc36dca0 DB |
2941 | err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], |
2942 | a[4]); | |
89bddce5 SH |
2943 | break; |
2944 | case SYS_GETSOCKOPT: | |
2945 | err = | |
13a2d70e DB |
2946 | __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
2947 | (int __user *)a[4]); | |
89bddce5 SH |
2948 | break; |
2949 | case SYS_SENDMSG: | |
e1834a32 DB |
2950 | err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, |
2951 | a[2], true); | |
89bddce5 | 2952 | break; |
228e548e | 2953 | case SYS_SENDMMSG: |
e1834a32 DB |
2954 | err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], |
2955 | a[3], true); | |
228e548e | 2956 | break; |
89bddce5 | 2957 | case SYS_RECVMSG: |
e1834a32 DB |
2958 | err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, |
2959 | a[2], true); | |
89bddce5 | 2960 | break; |
a2e27255 | 2961 | case SYS_RECVMMSG: |
3ca47e95 | 2962 | if (IS_ENABLED(CONFIG_64BIT)) |
e11d4284 AB |
2963 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, |
2964 | a[2], a[3], | |
2965 | (struct __kernel_timespec __user *)a[4], | |
2966 | NULL); | |
2967 | else | |
2968 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, | |
2969 | a[2], a[3], NULL, | |
2970 | (struct old_timespec32 __user *)a[4]); | |
a2e27255 | 2971 | break; |
de11defe | 2972 | case SYS_ACCEPT4: |
4541e805 DB |
2973 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
2974 | (int __user *)a[2], a[3]); | |
aaca0bdc | 2975 | break; |
89bddce5 SH |
2976 | default: |
2977 | err = -EINVAL; | |
2978 | break; | |
1da177e4 LT |
2979 | } |
2980 | return err; | |
2981 | } | |
2982 | ||
89bddce5 | 2983 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2984 | |
55737fda SH |
2985 | /** |
2986 | * sock_register - add a socket protocol handler | |
2987 | * @ops: description of protocol | |
2988 | * | |
1da177e4 LT |
2989 | * This function is called by a protocol handler that wants to |
2990 | * advertise its address family, and have it linked into the | |
e793c0f7 | 2991 | * socket interface. The value ops->family corresponds to the |
55737fda | 2992 | * socket system call protocol family. |
1da177e4 | 2993 | */ |
f0fd27d4 | 2994 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2995 | { |
2996 | int err; | |
2997 | ||
2998 | if (ops->family >= NPROTO) { | |
3410f22e | 2999 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
1da177e4 LT |
3000 | return -ENOBUFS; |
3001 | } | |
55737fda SH |
3002 | |
3003 | spin_lock(&net_family_lock); | |
190683a9 ED |
3004 | if (rcu_dereference_protected(net_families[ops->family], |
3005 | lockdep_is_held(&net_family_lock))) | |
55737fda SH |
3006 | err = -EEXIST; |
3007 | else { | |
cf778b00 | 3008 | rcu_assign_pointer(net_families[ops->family], ops); |
1da177e4 LT |
3009 | err = 0; |
3010 | } | |
55737fda SH |
3011 | spin_unlock(&net_family_lock); |
3012 | ||
3410f22e | 3013 | pr_info("NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
3014 | return err; |
3015 | } | |
c6d409cf | 3016 | EXPORT_SYMBOL(sock_register); |
1da177e4 | 3017 | |
55737fda SH |
3018 | /** |
3019 | * sock_unregister - remove a protocol handler | |
3020 | * @family: protocol family to remove | |
3021 | * | |
1da177e4 LT |
3022 | * This function is called by a protocol handler that wants to |
3023 | * remove its address family, and have it unlinked from the | |
55737fda SH |
3024 | * new socket creation. |
3025 | * | |
3026 | * If protocol handler is a module, then it can use module reference | |
3027 | * counts to protect against new references. If protocol handler is not | |
3028 | * a module then it needs to provide its own protection in | |
3029 | * the ops->create routine. | |
1da177e4 | 3030 | */ |
f0fd27d4 | 3031 | void sock_unregister(int family) |
1da177e4 | 3032 | { |
f0fd27d4 | 3033 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 3034 | |
55737fda | 3035 | spin_lock(&net_family_lock); |
a9b3cd7f | 3036 | RCU_INIT_POINTER(net_families[family], NULL); |
55737fda SH |
3037 | spin_unlock(&net_family_lock); |
3038 | ||
3039 | synchronize_rcu(); | |
3040 | ||
3410f22e | 3041 | pr_info("NET: Unregistered protocol family %d\n", family); |
1da177e4 | 3042 | } |
c6d409cf | 3043 | EXPORT_SYMBOL(sock_unregister); |
1da177e4 | 3044 | |
bf2ae2e4 XL |
3045 | bool sock_is_registered(int family) |
3046 | { | |
66b51b0a | 3047 | return family < NPROTO && rcu_access_pointer(net_families[family]); |
bf2ae2e4 XL |
3048 | } |
3049 | ||
77d76ea3 | 3050 | static int __init sock_init(void) |
1da177e4 | 3051 | { |
b3e19d92 | 3052 | int err; |
2ca794e5 EB |
3053 | /* |
3054 | * Initialize the network sysctl infrastructure. | |
3055 | */ | |
3056 | err = net_sysctl_init(); | |
3057 | if (err) | |
3058 | goto out; | |
b3e19d92 | 3059 | |
1da177e4 | 3060 | /* |
89bddce5 | 3061 | * Initialize skbuff SLAB cache |
1da177e4 LT |
3062 | */ |
3063 | skb_init(); | |
1da177e4 LT |
3064 | |
3065 | /* | |
89bddce5 | 3066 | * Initialize the protocols module. |
1da177e4 LT |
3067 | */ |
3068 | ||
3069 | init_inodecache(); | |
b3e19d92 NP |
3070 | |
3071 | err = register_filesystem(&sock_fs_type); | |
3072 | if (err) | |
3073 | goto out_fs; | |
1da177e4 | 3074 | sock_mnt = kern_mount(&sock_fs_type); |
b3e19d92 NP |
3075 | if (IS_ERR(sock_mnt)) { |
3076 | err = PTR_ERR(sock_mnt); | |
3077 | goto out_mount; | |
3078 | } | |
77d76ea3 AK |
3079 | |
3080 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
3081 | */ |
3082 | ||
3083 | #ifdef CONFIG_NETFILTER | |
6d11cfdb PNA |
3084 | err = netfilter_init(); |
3085 | if (err) | |
3086 | goto out; | |
1da177e4 | 3087 | #endif |
cbeb321a | 3088 | |
408eccce | 3089 | ptp_classifier_init(); |
c1f19b51 | 3090 | |
b3e19d92 NP |
3091 | out: |
3092 | return err; | |
3093 | ||
3094 | out_mount: | |
3095 | unregister_filesystem(&sock_fs_type); | |
3096 | out_fs: | |
3097 | goto out; | |
1da177e4 LT |
3098 | } |
3099 | ||
77d76ea3 AK |
3100 | core_initcall(sock_init); /* early initcall */ |
3101 | ||
1da177e4 LT |
3102 | #ifdef CONFIG_PROC_FS |
3103 | void socket_seq_show(struct seq_file *seq) | |
3104 | { | |
648845ab TZ |
3105 | seq_printf(seq, "sockets: used %d\n", |
3106 | sock_inuse_get(seq->private)); | |
1da177e4 | 3107 | } |
89bddce5 | 3108 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 3109 | |
89bbfc95 | 3110 | #ifdef CONFIG_COMPAT |
36fd633e | 3111 | static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) |
7a229387 | 3112 | { |
6b96018b | 3113 | struct compat_ifconf ifc32; |
7a229387 | 3114 | struct ifconf ifc; |
7a229387 AB |
3115 | int err; |
3116 | ||
6b96018b | 3117 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) |
7a229387 AB |
3118 | return -EFAULT; |
3119 | ||
36fd633e AV |
3120 | ifc.ifc_len = ifc32.ifc_len; |
3121 | ifc.ifc_req = compat_ptr(ifc32.ifcbuf); | |
7a229387 | 3122 | |
36fd633e AV |
3123 | rtnl_lock(); |
3124 | err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); | |
3125 | rtnl_unlock(); | |
7a229387 AB |
3126 | if (err) |
3127 | return err; | |
3128 | ||
36fd633e | 3129 | ifc32.ifc_len = ifc.ifc_len; |
6b96018b | 3130 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) |
7a229387 AB |
3131 | return -EFAULT; |
3132 | ||
3133 | return 0; | |
3134 | } | |
3135 | ||
6b96018b | 3136 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) |
7a229387 | 3137 | { |
3a7da39d BH |
3138 | struct compat_ethtool_rxnfc __user *compat_rxnfc; |
3139 | bool convert_in = false, convert_out = false; | |
44c02a2c AV |
3140 | size_t buf_size = 0; |
3141 | struct ethtool_rxnfc __user *rxnfc = NULL; | |
3142 | struct ifreq ifr; | |
3a7da39d BH |
3143 | u32 rule_cnt = 0, actual_rule_cnt; |
3144 | u32 ethcmd; | |
7a229387 | 3145 | u32 data; |
3a7da39d | 3146 | int ret; |
7a229387 | 3147 | |
3a7da39d BH |
3148 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) |
3149 | return -EFAULT; | |
7a229387 | 3150 | |
3a7da39d BH |
3151 | compat_rxnfc = compat_ptr(data); |
3152 | ||
3153 | if (get_user(ethcmd, &compat_rxnfc->cmd)) | |
7a229387 AB |
3154 | return -EFAULT; |
3155 | ||
3a7da39d BH |
3156 | /* Most ethtool structures are defined without padding. |
3157 | * Unfortunately struct ethtool_rxnfc is an exception. | |
3158 | */ | |
3159 | switch (ethcmd) { | |
3160 | default: | |
3161 | break; | |
3162 | case ETHTOOL_GRXCLSRLALL: | |
3163 | /* Buffer size is variable */ | |
3164 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) | |
3165 | return -EFAULT; | |
3166 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) | |
3167 | return -ENOMEM; | |
3168 | buf_size += rule_cnt * sizeof(u32); | |
3169 | /* fall through */ | |
3170 | case ETHTOOL_GRXRINGS: | |
3171 | case ETHTOOL_GRXCLSRLCNT: | |
3172 | case ETHTOOL_GRXCLSRULE: | |
55664f32 | 3173 | case ETHTOOL_SRXCLSRLINS: |
3a7da39d BH |
3174 | convert_out = true; |
3175 | /* fall through */ | |
3176 | case ETHTOOL_SRXCLSRLDEL: | |
3a7da39d BH |
3177 | buf_size += sizeof(struct ethtool_rxnfc); |
3178 | convert_in = true; | |
44c02a2c | 3179 | rxnfc = compat_alloc_user_space(buf_size); |
3a7da39d BH |
3180 | break; |
3181 | } | |
3182 | ||
44c02a2c | 3183 | if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) |
7a229387 AB |
3184 | return -EFAULT; |
3185 | ||
44c02a2c | 3186 | ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; |
7a229387 | 3187 | |
3a7da39d | 3188 | if (convert_in) { |
127fe533 | 3189 | /* We expect there to be holes between fs.m_ext and |
3a7da39d BH |
3190 | * fs.ring_cookie and at the end of fs, but nowhere else. |
3191 | */ | |
127fe533 AD |
3192 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + |
3193 | sizeof(compat_rxnfc->fs.m_ext) != | |
3194 | offsetof(struct ethtool_rxnfc, fs.m_ext) + | |
3195 | sizeof(rxnfc->fs.m_ext)); | |
3a7da39d BH |
3196 | BUILD_BUG_ON( |
3197 | offsetof(struct compat_ethtool_rxnfc, fs.location) - | |
3198 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != | |
3199 | offsetof(struct ethtool_rxnfc, fs.location) - | |
3200 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); | |
3201 | ||
3202 | if (copy_in_user(rxnfc, compat_rxnfc, | |
954b1244 SH |
3203 | (void __user *)(&rxnfc->fs.m_ext + 1) - |
3204 | (void __user *)rxnfc) || | |
3a7da39d BH |
3205 | copy_in_user(&rxnfc->fs.ring_cookie, |
3206 | &compat_rxnfc->fs.ring_cookie, | |
954b1244 | 3207 | (void __user *)(&rxnfc->fs.location + 1) - |
b6168562 WW |
3208 | (void __user *)&rxnfc->fs.ring_cookie)) |
3209 | return -EFAULT; | |
3210 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
3211 | if (put_user(rule_cnt, &rxnfc->rule_cnt)) | |
3212 | return -EFAULT; | |
3213 | } else if (copy_in_user(&rxnfc->rule_cnt, | |
3214 | &compat_rxnfc->rule_cnt, | |
3215 | sizeof(rxnfc->rule_cnt))) | |
3a7da39d BH |
3216 | return -EFAULT; |
3217 | } | |
3218 | ||
44c02a2c | 3219 | ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); |
3a7da39d BH |
3220 | if (ret) |
3221 | return ret; | |
3222 | ||
3223 | if (convert_out) { | |
3224 | if (copy_in_user(compat_rxnfc, rxnfc, | |
954b1244 SH |
3225 | (const void __user *)(&rxnfc->fs.m_ext + 1) - |
3226 | (const void __user *)rxnfc) || | |
3a7da39d BH |
3227 | copy_in_user(&compat_rxnfc->fs.ring_cookie, |
3228 | &rxnfc->fs.ring_cookie, | |
954b1244 SH |
3229 | (const void __user *)(&rxnfc->fs.location + 1) - |
3230 | (const void __user *)&rxnfc->fs.ring_cookie) || | |
3a7da39d BH |
3231 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, |
3232 | sizeof(rxnfc->rule_cnt))) | |
3233 | return -EFAULT; | |
3234 | ||
3235 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
3236 | /* As an optimisation, we only copy the actual | |
3237 | * number of rules that the underlying | |
3238 | * function returned. Since Mallory might | |
3239 | * change the rule count in user memory, we | |
3240 | * check that it is less than the rule count | |
3241 | * originally given (as the user buffer size), | |
3242 | * which has been range-checked. | |
3243 | */ | |
3244 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) | |
3245 | return -EFAULT; | |
3246 | if (actual_rule_cnt < rule_cnt) | |
3247 | rule_cnt = actual_rule_cnt; | |
3248 | if (copy_in_user(&compat_rxnfc->rule_locs[0], | |
3249 | &rxnfc->rule_locs[0], | |
3250 | rule_cnt * sizeof(u32))) | |
3251 | return -EFAULT; | |
3252 | } | |
3253 | } | |
3254 | ||
3255 | return 0; | |
7a229387 AB |
3256 | } |
3257 | ||
7a50a240 AB |
3258 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
3259 | { | |
7a50a240 | 3260 | compat_uptr_t uptr32; |
44c02a2c AV |
3261 | struct ifreq ifr; |
3262 | void __user *saved; | |
3263 | int err; | |
7a50a240 | 3264 | |
44c02a2c | 3265 | if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) |
7a50a240 AB |
3266 | return -EFAULT; |
3267 | ||
3268 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
3269 | return -EFAULT; | |
3270 | ||
44c02a2c AV |
3271 | saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; |
3272 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); | |
7a229387 | 3273 | |
44c02a2c AV |
3274 | err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); |
3275 | if (!err) { | |
3276 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; | |
3277 | if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) | |
3278 | err = -EFAULT; | |
ccbd6a5a | 3279 | } |
44c02a2c | 3280 | return err; |
7a229387 AB |
3281 | } |
3282 | ||
590d4693 BH |
3283 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ |
3284 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
6b96018b | 3285 | struct compat_ifreq __user *u_ifreq32) |
7a229387 | 3286 | { |
44c02a2c | 3287 | struct ifreq ifreq; |
7a229387 AB |
3288 | u32 data32; |
3289 | ||
44c02a2c | 3290 | if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) |
7a229387 | 3291 | return -EFAULT; |
44c02a2c | 3292 | if (get_user(data32, &u_ifreq32->ifr_data)) |
7a229387 | 3293 | return -EFAULT; |
44c02a2c | 3294 | ifreq.ifr_data = compat_ptr(data32); |
7a229387 | 3295 | |
44c02a2c | 3296 | return dev_ioctl(net, cmd, &ifreq, NULL); |
7a229387 AB |
3297 | } |
3298 | ||
37ac39bd JB |
3299 | static int compat_ifreq_ioctl(struct net *net, struct socket *sock, |
3300 | unsigned int cmd, | |
3301 | struct compat_ifreq __user *uifr32) | |
3302 | { | |
3303 | struct ifreq __user *uifr; | |
3304 | int err; | |
3305 | ||
3306 | /* Handle the fact that while struct ifreq has the same *layout* on | |
3307 | * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, | |
3308 | * which are handled elsewhere, it still has different *size* due to | |
3309 | * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, | |
3310 | * resulting in struct ifreq being 32 and 40 bytes respectively). | |
3311 | * As a result, if the struct happens to be at the end of a page and | |
3312 | * the next page isn't readable/writable, we get a fault. To prevent | |
3313 | * that, copy back and forth to the full size. | |
3314 | */ | |
3315 | ||
3316 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
3317 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) | |
3318 | return -EFAULT; | |
3319 | ||
3320 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); | |
3321 | ||
3322 | if (!err) { | |
3323 | switch (cmd) { | |
3324 | case SIOCGIFFLAGS: | |
3325 | case SIOCGIFMETRIC: | |
3326 | case SIOCGIFMTU: | |
3327 | case SIOCGIFMEM: | |
3328 | case SIOCGIFHWADDR: | |
3329 | case SIOCGIFINDEX: | |
3330 | case SIOCGIFADDR: | |
3331 | case SIOCGIFBRDADDR: | |
3332 | case SIOCGIFDSTADDR: | |
3333 | case SIOCGIFNETMASK: | |
3334 | case SIOCGIFPFLAGS: | |
3335 | case SIOCGIFTXQLEN: | |
3336 | case SIOCGMIIPHY: | |
3337 | case SIOCGMIIREG: | |
c6c9fee3 | 3338 | case SIOCGIFNAME: |
37ac39bd JB |
3339 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) |
3340 | err = -EFAULT; | |
3341 | break; | |
3342 | } | |
3343 | } | |
3344 | return err; | |
3345 | } | |
3346 | ||
a2116ed2 AB |
3347 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, |
3348 | struct compat_ifreq __user *uifr32) | |
3349 | { | |
3350 | struct ifreq ifr; | |
3351 | struct compat_ifmap __user *uifmap32; | |
a2116ed2 AB |
3352 | int err; |
3353 | ||
3354 | uifmap32 = &uifr32->ifr_ifru.ifru_map; | |
3355 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); | |
3ddc5b46 MD |
3356 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
3357 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
3358 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
3359 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); | |
3360 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); | |
3361 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); | |
a2116ed2 AB |
3362 | if (err) |
3363 | return -EFAULT; | |
3364 | ||
44c02a2c | 3365 | err = dev_ioctl(net, cmd, &ifr, NULL); |
a2116ed2 AB |
3366 | |
3367 | if (cmd == SIOCGIFMAP && !err) { | |
3368 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); | |
3ddc5b46 MD |
3369 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
3370 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
3371 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
3372 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); | |
3373 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); | |
3374 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); | |
a2116ed2 AB |
3375 | if (err) |
3376 | err = -EFAULT; | |
3377 | } | |
3378 | return err; | |
3379 | } | |
3380 | ||
7a229387 AB |
3381 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE |
3382 | * for some operations; this forces use of the newer bridge-utils that | |
25985edc | 3383 | * use compatible ioctls |
7a229387 | 3384 | */ |
6b96018b | 3385 | static int old_bridge_ioctl(compat_ulong_t __user *argp) |
7a229387 | 3386 | { |
6b96018b | 3387 | compat_ulong_t tmp; |
7a229387 | 3388 | |
6b96018b | 3389 | if (get_user(tmp, argp)) |
7a229387 AB |
3390 | return -EFAULT; |
3391 | if (tmp == BRCTL_GET_VERSION) | |
3392 | return BRCTL_VERSION + 1; | |
3393 | return -EINVAL; | |
3394 | } | |
3395 | ||
6b96018b AB |
3396 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
3397 | unsigned int cmd, unsigned long arg) | |
3398 | { | |
3399 | void __user *argp = compat_ptr(arg); | |
3400 | struct sock *sk = sock->sk; | |
3401 | struct net *net = sock_net(sk); | |
7a229387 | 3402 | |
6b96018b | 3403 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
590d4693 | 3404 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3405 | |
3406 | switch (cmd) { | |
3407 | case SIOCSIFBR: | |
3408 | case SIOCGIFBR: | |
3409 | return old_bridge_ioctl(argp); | |
6b96018b | 3410 | case SIOCGIFCONF: |
36fd633e | 3411 | return compat_dev_ifconf(net, argp); |
6b96018b AB |
3412 | case SIOCETHTOOL: |
3413 | return ethtool_ioctl(net, argp); | |
7a50a240 AB |
3414 | case SIOCWANDEV: |
3415 | return compat_siocwandev(net, argp); | |
a2116ed2 AB |
3416 | case SIOCGIFMAP: |
3417 | case SIOCSIFMAP: | |
3418 | return compat_sioc_ifmap(net, cmd, argp); | |
0768e170 AB |
3419 | case SIOCGSTAMP_OLD: |
3420 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
3421 | if (!sock->ops->gettstamp) |
3422 | return -ENOIOCTLCMD; | |
0768e170 | 3423 | return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, |
c7cbdbf2 AB |
3424 | !COMPAT_USE_64BIT_TIME); |
3425 | ||
590d4693 BH |
3426 | case SIOCBONDSLAVEINFOQUERY: |
3427 | case SIOCBONDINFOQUERY: | |
a2116ed2 | 3428 | case SIOCSHWTSTAMP: |
fd468c74 | 3429 | case SIOCGHWTSTAMP: |
590d4693 | 3430 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3431 | |
3432 | case FIOSETOWN: | |
3433 | case SIOCSPGRP: | |
3434 | case FIOGETOWN: | |
3435 | case SIOCGPGRP: | |
3436 | case SIOCBRADDBR: | |
3437 | case SIOCBRDELBR: | |
3438 | case SIOCGIFVLAN: | |
3439 | case SIOCSIFVLAN: | |
3440 | case SIOCADDDLCI: | |
3441 | case SIOCDELDLCI: | |
c62cce2c | 3442 | case SIOCGSKNS: |
0768e170 AB |
3443 | case SIOCGSTAMP_NEW: |
3444 | case SIOCGSTAMPNS_NEW: | |
6b96018b AB |
3445 | return sock_ioctl(file, cmd, arg); |
3446 | ||
3447 | case SIOCGIFFLAGS: | |
3448 | case SIOCSIFFLAGS: | |
3449 | case SIOCGIFMETRIC: | |
3450 | case SIOCSIFMETRIC: | |
3451 | case SIOCGIFMTU: | |
3452 | case SIOCSIFMTU: | |
3453 | case SIOCGIFMEM: | |
3454 | case SIOCSIFMEM: | |
3455 | case SIOCGIFHWADDR: | |
3456 | case SIOCSIFHWADDR: | |
3457 | case SIOCADDMULTI: | |
3458 | case SIOCDELMULTI: | |
3459 | case SIOCGIFINDEX: | |
6b96018b AB |
3460 | case SIOCGIFADDR: |
3461 | case SIOCSIFADDR: | |
3462 | case SIOCSIFHWBROADCAST: | |
6b96018b | 3463 | case SIOCDIFADDR: |
6b96018b AB |
3464 | case SIOCGIFBRDADDR: |
3465 | case SIOCSIFBRDADDR: | |
3466 | case SIOCGIFDSTADDR: | |
3467 | case SIOCSIFDSTADDR: | |
3468 | case SIOCGIFNETMASK: | |
3469 | case SIOCSIFNETMASK: | |
3470 | case SIOCSIFPFLAGS: | |
3471 | case SIOCGIFPFLAGS: | |
3472 | case SIOCGIFTXQLEN: | |
3473 | case SIOCSIFTXQLEN: | |
3474 | case SIOCBRADDIF: | |
3475 | case SIOCBRDELIF: | |
c6c9fee3 | 3476 | case SIOCGIFNAME: |
9177efd3 AB |
3477 | case SIOCSIFNAME: |
3478 | case SIOCGMIIPHY: | |
3479 | case SIOCGMIIREG: | |
3480 | case SIOCSMIIREG: | |
f92d4fc9 AV |
3481 | case SIOCBONDENSLAVE: |
3482 | case SIOCBONDRELEASE: | |
3483 | case SIOCBONDSETHWADDR: | |
3484 | case SIOCBONDCHANGEACTIVE: | |
37ac39bd JB |
3485 | return compat_ifreq_ioctl(net, sock, cmd, argp); |
3486 | ||
6b96018b AB |
3487 | case SIOCSARP: |
3488 | case SIOCGARP: | |
3489 | case SIOCDARP: | |
c7dc504e | 3490 | case SIOCOUTQ: |
9d7bf41f | 3491 | case SIOCOUTQNSD: |
6b96018b | 3492 | case SIOCATMARK: |
63ff03ab | 3493 | return sock_do_ioctl(net, sock, cmd, arg); |
9177efd3 AB |
3494 | } |
3495 | ||
6b96018b AB |
3496 | return -ENOIOCTLCMD; |
3497 | } | |
7a229387 | 3498 | |
95c96174 | 3499 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, |
89bddce5 | 3500 | unsigned long arg) |
89bbfc95 SP |
3501 | { |
3502 | struct socket *sock = file->private_data; | |
3503 | int ret = -ENOIOCTLCMD; | |
87de87d5 DM |
3504 | struct sock *sk; |
3505 | struct net *net; | |
3506 | ||
3507 | sk = sock->sk; | |
3508 | net = sock_net(sk); | |
89bbfc95 SP |
3509 | |
3510 | if (sock->ops->compat_ioctl) | |
3511 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3512 | ||
87de87d5 DM |
3513 | if (ret == -ENOIOCTLCMD && |
3514 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3515 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3516 | ||
6b96018b AB |
3517 | if (ret == -ENOIOCTLCMD) |
3518 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3519 | ||
89bbfc95 SP |
3520 | return ret; |
3521 | } | |
3522 | #endif | |
3523 | ||
8a3c245c PT |
3524 | /** |
3525 | * kernel_bind - bind an address to a socket (kernel space) | |
3526 | * @sock: socket | |
3527 | * @addr: address | |
3528 | * @addrlen: length of address | |
3529 | * | |
3530 | * Returns 0 or an error. | |
3531 | */ | |
3532 | ||
ac5a488e SS |
3533 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
3534 | { | |
3535 | return sock->ops->bind(sock, addr, addrlen); | |
3536 | } | |
c6d409cf | 3537 | EXPORT_SYMBOL(kernel_bind); |
ac5a488e | 3538 | |
8a3c245c PT |
3539 | /** |
3540 | * kernel_listen - move socket to listening state (kernel space) | |
3541 | * @sock: socket | |
3542 | * @backlog: pending connections queue size | |
3543 | * | |
3544 | * Returns 0 or an error. | |
3545 | */ | |
3546 | ||
ac5a488e SS |
3547 | int kernel_listen(struct socket *sock, int backlog) |
3548 | { | |
3549 | return sock->ops->listen(sock, backlog); | |
3550 | } | |
c6d409cf | 3551 | EXPORT_SYMBOL(kernel_listen); |
ac5a488e | 3552 | |
8a3c245c PT |
3553 | /** |
3554 | * kernel_accept - accept a connection (kernel space) | |
3555 | * @sock: listening socket | |
3556 | * @newsock: new connected socket | |
3557 | * @flags: flags | |
3558 | * | |
3559 | * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. | |
3560 | * If it fails, @newsock is guaranteed to be %NULL. | |
3561 | * Returns 0 or an error. | |
3562 | */ | |
3563 | ||
ac5a488e SS |
3564 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
3565 | { | |
3566 | struct sock *sk = sock->sk; | |
3567 | int err; | |
3568 | ||
3569 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3570 | newsock); | |
3571 | if (err < 0) | |
3572 | goto done; | |
3573 | ||
cdfbabfb | 3574 | err = sock->ops->accept(sock, *newsock, flags, true); |
ac5a488e SS |
3575 | if (err < 0) { |
3576 | sock_release(*newsock); | |
fa8705b0 | 3577 | *newsock = NULL; |
ac5a488e SS |
3578 | goto done; |
3579 | } | |
3580 | ||
3581 | (*newsock)->ops = sock->ops; | |
1b08534e | 3582 | __module_get((*newsock)->ops->owner); |
ac5a488e SS |
3583 | |
3584 | done: | |
3585 | return err; | |
3586 | } | |
c6d409cf | 3587 | EXPORT_SYMBOL(kernel_accept); |
ac5a488e | 3588 | |
8a3c245c PT |
3589 | /** |
3590 | * kernel_connect - connect a socket (kernel space) | |
3591 | * @sock: socket | |
3592 | * @addr: address | |
3593 | * @addrlen: address length | |
3594 | * @flags: flags (O_NONBLOCK, ...) | |
3595 | * | |
3596 | * For datagram sockets, @addr is the addres to which datagrams are sent | |
3597 | * by default, and the only address from which datagrams are received. | |
3598 | * For stream sockets, attempts to connect to @addr. | |
3599 | * Returns 0 or an error code. | |
3600 | */ | |
3601 | ||
ac5a488e | 3602 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
4768fbcb | 3603 | int flags) |
ac5a488e SS |
3604 | { |
3605 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3606 | } | |
c6d409cf | 3607 | EXPORT_SYMBOL(kernel_connect); |
ac5a488e | 3608 | |
8a3c245c PT |
3609 | /** |
3610 | * kernel_getsockname - get the address which the socket is bound (kernel space) | |
3611 | * @sock: socket | |
3612 | * @addr: address holder | |
3613 | * | |
3614 | * Fills the @addr pointer with the address which the socket is bound. | |
3615 | * Returns 0 or an error code. | |
3616 | */ | |
3617 | ||
9b2c45d4 | 3618 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3619 | { |
9b2c45d4 | 3620 | return sock->ops->getname(sock, addr, 0); |
ac5a488e | 3621 | } |
c6d409cf | 3622 | EXPORT_SYMBOL(kernel_getsockname); |
ac5a488e | 3623 | |
8a3c245c PT |
3624 | /** |
3625 | * kernel_peername - get the address which the socket is connected (kernel space) | |
3626 | * @sock: socket | |
3627 | * @addr: address holder | |
3628 | * | |
3629 | * Fills the @addr pointer with the address which the socket is connected. | |
3630 | * Returns 0 or an error code. | |
3631 | */ | |
3632 | ||
9b2c45d4 | 3633 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3634 | { |
9b2c45d4 | 3635 | return sock->ops->getname(sock, addr, 1); |
ac5a488e | 3636 | } |
c6d409cf | 3637 | EXPORT_SYMBOL(kernel_getpeername); |
ac5a488e | 3638 | |
8a3c245c PT |
3639 | /** |
3640 | * kernel_sendpage - send a &page through a socket (kernel space) | |
3641 | * @sock: socket | |
3642 | * @page: page | |
3643 | * @offset: page offset | |
3644 | * @size: total size in bytes | |
3645 | * @flags: flags (MSG_DONTWAIT, ...) | |
3646 | * | |
3647 | * Returns the total amount sent in bytes or an error. | |
3648 | */ | |
3649 | ||
ac5a488e SS |
3650 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
3651 | size_t size, int flags) | |
3652 | { | |
3653 | if (sock->ops->sendpage) | |
3654 | return sock->ops->sendpage(sock, page, offset, size, flags); | |
3655 | ||
3656 | return sock_no_sendpage(sock, page, offset, size, flags); | |
3657 | } | |
c6d409cf | 3658 | EXPORT_SYMBOL(kernel_sendpage); |
ac5a488e | 3659 | |
8a3c245c PT |
3660 | /** |
3661 | * kernel_sendpage_locked - send a &page through the locked sock (kernel space) | |
3662 | * @sk: sock | |
3663 | * @page: page | |
3664 | * @offset: page offset | |
3665 | * @size: total size in bytes | |
3666 | * @flags: flags (MSG_DONTWAIT, ...) | |
3667 | * | |
3668 | * Returns the total amount sent in bytes or an error. | |
3669 | * Caller must hold @sk. | |
3670 | */ | |
3671 | ||
306b13eb TH |
3672 | int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, |
3673 | size_t size, int flags) | |
3674 | { | |
3675 | struct socket *sock = sk->sk_socket; | |
3676 | ||
3677 | if (sock->ops->sendpage_locked) | |
3678 | return sock->ops->sendpage_locked(sk, page, offset, size, | |
3679 | flags); | |
3680 | ||
3681 | return sock_no_sendpage_locked(sk, page, offset, size, flags); | |
3682 | } | |
3683 | EXPORT_SYMBOL(kernel_sendpage_locked); | |
3684 | ||
8a3c245c PT |
3685 | /** |
3686 | * kernel_shutdown - shut down part of a full-duplex connection (kernel space) | |
3687 | * @sock: socket | |
3688 | * @how: connection part | |
3689 | * | |
3690 | * Returns 0 or an error. | |
3691 | */ | |
3692 | ||
91cf45f0 TM |
3693 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
3694 | { | |
3695 | return sock->ops->shutdown(sock, how); | |
3696 | } | |
91cf45f0 | 3697 | EXPORT_SYMBOL(kernel_sock_shutdown); |
113c3075 | 3698 | |
8a3c245c PT |
3699 | /** |
3700 | * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket | |
3701 | * @sk: socket | |
3702 | * | |
3703 | * This routine returns the IP overhead imposed by a socket i.e. | |
3704 | * the length of the underlying IP header, depending on whether | |
3705 | * this is an IPv4 or IPv6 socket and the length from IP options turned | |
3706 | * on at the socket. Assumes that the caller has a lock on the socket. | |
113c3075 | 3707 | */ |
8a3c245c | 3708 | |
113c3075 P |
3709 | u32 kernel_sock_ip_overhead(struct sock *sk) |
3710 | { | |
3711 | struct inet_sock *inet; | |
3712 | struct ip_options_rcu *opt; | |
3713 | u32 overhead = 0; | |
113c3075 P |
3714 | #if IS_ENABLED(CONFIG_IPV6) |
3715 | struct ipv6_pinfo *np; | |
3716 | struct ipv6_txoptions *optv6 = NULL; | |
3717 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3718 | ||
3719 | if (!sk) | |
3720 | return overhead; | |
3721 | ||
113c3075 P |
3722 | switch (sk->sk_family) { |
3723 | case AF_INET: | |
3724 | inet = inet_sk(sk); | |
3725 | overhead += sizeof(struct iphdr); | |
3726 | opt = rcu_dereference_protected(inet->inet_opt, | |
614d79c0 | 3727 | sock_owned_by_user(sk)); |
113c3075 P |
3728 | if (opt) |
3729 | overhead += opt->opt.optlen; | |
3730 | return overhead; | |
3731 | #if IS_ENABLED(CONFIG_IPV6) | |
3732 | case AF_INET6: | |
3733 | np = inet6_sk(sk); | |
3734 | overhead += sizeof(struct ipv6hdr); | |
3735 | if (np) | |
3736 | optv6 = rcu_dereference_protected(np->opt, | |
614d79c0 | 3737 | sock_owned_by_user(sk)); |
113c3075 P |
3738 | if (optv6) |
3739 | overhead += (optv6->opt_flen + optv6->opt_nflen); | |
3740 | return overhead; | |
3741 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3742 | default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ | |
3743 | return overhead; | |
3744 | } | |
3745 | } | |
3746 | EXPORT_SYMBOL(kernel_sock_ip_overhead); |