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 | ||
cc69837f | 55 | #include <linux/ethtool.h> |
1da177e4 | 56 | #include <linux/mm.h> |
1da177e4 LT |
57 | #include <linux/socket.h> |
58 | #include <linux/file.h> | |
59 | #include <linux/net.h> | |
60 | #include <linux/interrupt.h> | |
aaca0bdc | 61 | #include <linux/thread_info.h> |
55737fda | 62 | #include <linux/rcupdate.h> |
1da177e4 LT |
63 | #include <linux/netdevice.h> |
64 | #include <linux/proc_fs.h> | |
65 | #include <linux/seq_file.h> | |
4a3e2f71 | 66 | #include <linux/mutex.h> |
1da177e4 | 67 | #include <linux/if_bridge.h> |
20380731 | 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 | |
8a3c245c | 448 | * |
dba4a925 | 449 | * On failure returns %NULL. |
8a3c245c PT |
450 | */ |
451 | ||
dba4a925 | 452 | struct socket *sock_from_file(struct file *file) |
6cb153ca | 453 | { |
6cb153ca BL |
454 | if (file->f_op == &socket_file_ops) |
455 | return file->private_data; /* set in sock_map_fd */ | |
456 | ||
23bb80d2 | 457 | return NULL; |
6cb153ca | 458 | } |
406a3c63 | 459 | EXPORT_SYMBOL(sock_from_file); |
6cb153ca | 460 | |
1da177e4 | 461 | /** |
c6d409cf | 462 | * sockfd_lookup - Go from a file number to its socket slot |
1da177e4 LT |
463 | * @fd: file handle |
464 | * @err: pointer to an error code return | |
465 | * | |
466 | * The file handle passed in is locked and the socket it is bound | |
241c4667 | 467 | * to is returned. If an error occurs the err pointer is overwritten |
1da177e4 LT |
468 | * with a negative errno code and NULL is returned. The function checks |
469 | * for both invalid handles and passing a handle which is not a socket. | |
470 | * | |
471 | * On a success the socket object pointer is returned. | |
472 | */ | |
473 | ||
474 | struct socket *sockfd_lookup(int fd, int *err) | |
475 | { | |
476 | struct file *file; | |
1da177e4 LT |
477 | struct socket *sock; |
478 | ||
89bddce5 SH |
479 | file = fget(fd); |
480 | if (!file) { | |
1da177e4 LT |
481 | *err = -EBADF; |
482 | return NULL; | |
483 | } | |
89bddce5 | 484 | |
dba4a925 FR |
485 | sock = sock_from_file(file); |
486 | if (!sock) { | |
487 | *err = -ENOTSOCK; | |
1da177e4 | 488 | fput(file); |
dba4a925 | 489 | } |
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 | 500 | if (f.file) { |
dba4a925 | 501 | sock = sock_from_file(f.file); |
00e188ef | 502 | if (likely(sock)) { |
ce787a5a | 503 | *fput_needed = f.flags & FDPUT_FPUT; |
6cb153ca | 504 | return sock; |
00e188ef | 505 | } |
dba4a925 | 506 | *err = -ENOTSOCK; |
00e188ef | 507 | fdput(f); |
1da177e4 | 508 | } |
6cb153ca | 509 | return NULL; |
1da177e4 LT |
510 | } |
511 | ||
600e1779 MY |
512 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, |
513 | size_t size) | |
514 | { | |
515 | ssize_t len; | |
516 | ssize_t used = 0; | |
517 | ||
c5ef6035 | 518 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); |
600e1779 MY |
519 | if (len < 0) |
520 | return len; | |
521 | used += len; | |
522 | if (buffer) { | |
523 | if (size < used) | |
524 | return -ERANGE; | |
525 | buffer += len; | |
526 | } | |
527 | ||
528 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
529 | used += len; | |
530 | if (buffer) { | |
531 | if (size < used) | |
532 | return -ERANGE; | |
533 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
534 | buffer += len; | |
535 | } | |
536 | ||
537 | return used; | |
538 | } | |
539 | ||
dc647ec8 | 540 | static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) |
86741ec2 LC |
541 | { |
542 | int err = simple_setattr(dentry, iattr); | |
543 | ||
e1a3a60a | 544 | if (!err && (iattr->ia_valid & ATTR_UID)) { |
86741ec2 LC |
545 | struct socket *sock = SOCKET_I(d_inode(dentry)); |
546 | ||
6d8c50dc CW |
547 | if (sock->sk) |
548 | sock->sk->sk_uid = iattr->ia_uid; | |
549 | else | |
550 | err = -ENOENT; | |
86741ec2 LC |
551 | } |
552 | ||
553 | return err; | |
554 | } | |
555 | ||
600e1779 | 556 | static const struct inode_operations sockfs_inode_ops = { |
600e1779 | 557 | .listxattr = sockfs_listxattr, |
86741ec2 | 558 | .setattr = sockfs_setattr, |
600e1779 MY |
559 | }; |
560 | ||
1da177e4 | 561 | /** |
8a3c245c | 562 | * sock_alloc - allocate a socket |
89bddce5 | 563 | * |
1da177e4 LT |
564 | * Allocate a new inode and socket object. The two are bound together |
565 | * and initialised. The socket is then returned. If we are out of inodes | |
8a3c245c | 566 | * NULL is returned. This functions uses GFP_KERNEL internally. |
1da177e4 LT |
567 | */ |
568 | ||
f4a00aac | 569 | struct socket *sock_alloc(void) |
1da177e4 | 570 | { |
89bddce5 SH |
571 | struct inode *inode; |
572 | struct socket *sock; | |
1da177e4 | 573 | |
a209dfc7 | 574 | inode = new_inode_pseudo(sock_mnt->mnt_sb); |
1da177e4 LT |
575 | if (!inode) |
576 | return NULL; | |
577 | ||
578 | sock = SOCKET_I(inode); | |
579 | ||
85fe4025 | 580 | inode->i_ino = get_next_ino(); |
89bddce5 | 581 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
8192b0c4 DH |
582 | inode->i_uid = current_fsuid(); |
583 | inode->i_gid = current_fsgid(); | |
600e1779 | 584 | inode->i_op = &sockfs_inode_ops; |
1da177e4 | 585 | |
1da177e4 LT |
586 | return sock; |
587 | } | |
f4a00aac | 588 | EXPORT_SYMBOL(sock_alloc); |
1da177e4 | 589 | |
6d8c50dc | 590 | static void __sock_release(struct socket *sock, struct inode *inode) |
1da177e4 LT |
591 | { |
592 | if (sock->ops) { | |
593 | struct module *owner = sock->ops->owner; | |
594 | ||
6d8c50dc CW |
595 | if (inode) |
596 | inode_lock(inode); | |
1da177e4 | 597 | sock->ops->release(sock); |
ff7b11aa | 598 | sock->sk = NULL; |
6d8c50dc CW |
599 | if (inode) |
600 | inode_unlock(inode); | |
1da177e4 LT |
601 | sock->ops = NULL; |
602 | module_put(owner); | |
603 | } | |
604 | ||
333f7909 | 605 | if (sock->wq.fasync_list) |
3410f22e | 606 | pr_err("%s: fasync list not empty!\n", __func__); |
1da177e4 | 607 | |
1da177e4 LT |
608 | if (!sock->file) { |
609 | iput(SOCK_INODE(sock)); | |
610 | return; | |
611 | } | |
89bddce5 | 612 | sock->file = NULL; |
1da177e4 | 613 | } |
6d8c50dc | 614 | |
9a8ad9ac AL |
615 | /** |
616 | * sock_release - close a socket | |
617 | * @sock: socket to close | |
618 | * | |
619 | * The socket is released from the protocol stack if it has a release | |
620 | * callback, and the inode is then released if the socket is bound to | |
621 | * an inode not a file. | |
622 | */ | |
6d8c50dc CW |
623 | void sock_release(struct socket *sock) |
624 | { | |
625 | __sock_release(sock, NULL); | |
626 | } | |
c6d409cf | 627 | EXPORT_SYMBOL(sock_release); |
1da177e4 | 628 | |
c14ac945 | 629 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) |
20d49473 | 630 | { |
140c55d4 ED |
631 | u8 flags = *tx_flags; |
632 | ||
c14ac945 | 633 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) |
140c55d4 ED |
634 | flags |= SKBTX_HW_TSTAMP; |
635 | ||
c14ac945 | 636 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) |
140c55d4 ED |
637 | flags |= SKBTX_SW_TSTAMP; |
638 | ||
c14ac945 | 639 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) |
140c55d4 ED |
640 | flags |= SKBTX_SCHED_TSTAMP; |
641 | ||
140c55d4 | 642 | *tx_flags = flags; |
20d49473 | 643 | } |
67cc0d40 | 644 | EXPORT_SYMBOL(__sock_tx_timestamp); |
20d49473 | 645 | |
8c3c447b PA |
646 | INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *, |
647 | size_t)); | |
a648a592 PA |
648 | INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *, |
649 | size_t)); | |
d8725c86 | 650 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) |
1da177e4 | 651 | { |
a648a592 PA |
652 | int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg, |
653 | inet_sendmsg, sock, msg, | |
654 | msg_data_left(msg)); | |
d8725c86 AV |
655 | BUG_ON(ret == -EIOCBQUEUED); |
656 | return ret; | |
1da177e4 LT |
657 | } |
658 | ||
85806af0 RD |
659 | /** |
660 | * sock_sendmsg - send a message through @sock | |
661 | * @sock: socket | |
662 | * @msg: message to send | |
663 | * | |
664 | * Sends @msg through @sock, passing through LSM. | |
665 | * Returns the number of bytes sent, or an error code. | |
666 | */ | |
d8725c86 | 667 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) |
228e548e | 668 | { |
d8725c86 | 669 | int err = security_socket_sendmsg(sock, msg, |
01e97e65 | 670 | msg_data_left(msg)); |
228e548e | 671 | |
d8725c86 | 672 | return err ?: sock_sendmsg_nosec(sock, msg); |
0cf00c6f | 673 | } |
c6d409cf | 674 | EXPORT_SYMBOL(sock_sendmsg); |
1da177e4 | 675 | |
8a3c245c PT |
676 | /** |
677 | * kernel_sendmsg - send a message through @sock (kernel-space) | |
678 | * @sock: socket | |
679 | * @msg: message header | |
680 | * @vec: kernel vec | |
681 | * @num: vec array length | |
682 | * @size: total message data size | |
683 | * | |
684 | * Builds the message data with @vec and sends it through @sock. | |
685 | * Returns the number of bytes sent, or an error code. | |
686 | */ | |
687 | ||
1da177e4 LT |
688 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
689 | struct kvec *vec, size_t num, size_t size) | |
690 | { | |
aa563d7b | 691 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
d8725c86 | 692 | return sock_sendmsg(sock, msg); |
1da177e4 | 693 | } |
c6d409cf | 694 | EXPORT_SYMBOL(kernel_sendmsg); |
1da177e4 | 695 | |
8a3c245c PT |
696 | /** |
697 | * kernel_sendmsg_locked - send a message through @sock (kernel-space) | |
698 | * @sk: sock | |
699 | * @msg: message header | |
700 | * @vec: output s/g array | |
701 | * @num: output s/g array length | |
702 | * @size: total message data size | |
703 | * | |
704 | * Builds the message data with @vec and sends it through @sock. | |
705 | * Returns the number of bytes sent, or an error code. | |
706 | * Caller must hold @sk. | |
707 | */ | |
708 | ||
306b13eb TH |
709 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, |
710 | struct kvec *vec, size_t num, size_t size) | |
711 | { | |
712 | struct socket *sock = sk->sk_socket; | |
713 | ||
714 | if (!sock->ops->sendmsg_locked) | |
db5980d8 | 715 | return sock_no_sendmsg_locked(sk, msg, size); |
306b13eb | 716 | |
aa563d7b | 717 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
306b13eb TH |
718 | |
719 | return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); | |
720 | } | |
721 | EXPORT_SYMBOL(kernel_sendmsg_locked); | |
722 | ||
8605330a SHY |
723 | static bool skb_is_err_queue(const struct sk_buff *skb) |
724 | { | |
725 | /* pkt_type of skbs enqueued on the error queue are set to | |
726 | * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do | |
727 | * in recvmsg, since skbs received on a local socket will never | |
728 | * have a pkt_type of PACKET_OUTGOING. | |
729 | */ | |
730 | return skb->pkt_type == PACKET_OUTGOING; | |
731 | } | |
732 | ||
b50a5c70 ML |
733 | /* On transmit, software and hardware timestamps are returned independently. |
734 | * As the two skb clones share the hardware timestamp, which may be updated | |
735 | * before the software timestamp is received, a hardware TX timestamp may be | |
736 | * returned only if there is no software TX timestamp. Ignore false software | |
737 | * timestamps, which may be made in the __sock_recv_timestamp() call when the | |
7f1bc6e9 | 738 | * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a |
b50a5c70 ML |
739 | * hardware timestamp. |
740 | */ | |
741 | static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) | |
742 | { | |
743 | return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); | |
744 | } | |
745 | ||
aad9c8c4 ML |
746 | static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
747 | { | |
748 | struct scm_ts_pktinfo ts_pktinfo; | |
749 | struct net_device *orig_dev; | |
750 | ||
751 | if (!skb_mac_header_was_set(skb)) | |
752 | return; | |
753 | ||
754 | memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); | |
755 | ||
756 | rcu_read_lock(); | |
757 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
758 | if (orig_dev) | |
759 | ts_pktinfo.if_index = orig_dev->ifindex; | |
760 | rcu_read_unlock(); | |
761 | ||
762 | ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); | |
763 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, | |
764 | sizeof(ts_pktinfo), &ts_pktinfo); | |
765 | } | |
766 | ||
92f37fd2 ED |
767 | /* |
768 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
769 | */ | |
770 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
771 | struct sk_buff *skb) | |
772 | { | |
20d49473 | 773 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
887feae3 | 774 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
9718475e DD |
775 | struct scm_timestamping_internal tss; |
776 | ||
b50a5c70 | 777 | int empty = 1, false_tstamp = 0; |
20d49473 PO |
778 | struct skb_shared_hwtstamps *shhwtstamps = |
779 | skb_hwtstamps(skb); | |
780 | ||
781 | /* Race occurred between timestamp enabling and packet | |
782 | receiving. Fill in the current time for now. */ | |
b50a5c70 | 783 | if (need_software_tstamp && skb->tstamp == 0) { |
20d49473 | 784 | __net_timestamp(skb); |
b50a5c70 ML |
785 | false_tstamp = 1; |
786 | } | |
20d49473 PO |
787 | |
788 | if (need_software_tstamp) { | |
789 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 DD |
790 | if (new_tstamp) { |
791 | struct __kernel_sock_timeval tv; | |
792 | ||
793 | skb_get_new_timestamp(skb, &tv); | |
794 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, | |
795 | sizeof(tv), &tv); | |
796 | } else { | |
797 | struct __kernel_old_timeval tv; | |
798 | ||
799 | skb_get_timestamp(skb, &tv); | |
800 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, | |
801 | sizeof(tv), &tv); | |
802 | } | |
20d49473 | 803 | } else { |
887feae3 DD |
804 | if (new_tstamp) { |
805 | struct __kernel_timespec ts; | |
806 | ||
807 | skb_get_new_timestampns(skb, &ts); | |
808 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, | |
809 | sizeof(ts), &ts); | |
810 | } else { | |
df1b4ba9 | 811 | struct __kernel_old_timespec ts; |
887feae3 DD |
812 | |
813 | skb_get_timestampns(skb, &ts); | |
814 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, | |
815 | sizeof(ts), &ts); | |
816 | } | |
20d49473 PO |
817 | } |
818 | } | |
819 | ||
f24b9be5 | 820 | memset(&tss, 0, sizeof(tss)); |
c199105d | 821 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && |
9718475e | 822 | ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) |
20d49473 | 823 | empty = 0; |
4d276eb6 | 824 | if (shhwtstamps && |
b9f40e21 | 825 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
b50a5c70 | 826 | !skb_is_swtx_tstamp(skb, false_tstamp) && |
9718475e | 827 | ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { |
4d276eb6 | 828 | empty = 0; |
aad9c8c4 ML |
829 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && |
830 | !skb_is_err_queue(skb)) | |
831 | put_ts_pktinfo(msg, skb); | |
832 | } | |
1c885808 | 833 | if (!empty) { |
9718475e DD |
834 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) |
835 | put_cmsg_scm_timestamping64(msg, &tss); | |
836 | else | |
837 | put_cmsg_scm_timestamping(msg, &tss); | |
1c885808 | 838 | |
8605330a | 839 | if (skb_is_err_queue(skb) && skb->len && |
4ef1b286 | 840 | SKB_EXT_ERR(skb)->opt_stats) |
1c885808 FY |
841 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, |
842 | skb->len, skb->data); | |
843 | } | |
92f37fd2 | 844 | } |
7c81fd8b ACM |
845 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
846 | ||
6e3e939f JB |
847 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
848 | struct sk_buff *skb) | |
849 | { | |
850 | int ack; | |
851 | ||
852 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
853 | return; | |
854 | if (!skb->wifi_acked_valid) | |
855 | return; | |
856 | ||
857 | ack = skb->wifi_acked; | |
858 | ||
859 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
860 | } | |
861 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
862 | ||
11165f14 | 863 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
864 | struct sk_buff *skb) | |
3b885787 | 865 | { |
744d5a3e | 866 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) |
3b885787 | 867 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
744d5a3e | 868 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); |
3b885787 NH |
869 | } |
870 | ||
767dd033 | 871 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
3b885787 NH |
872 | struct sk_buff *skb) |
873 | { | |
874 | sock_recv_timestamp(msg, sk, skb); | |
875 | sock_recv_drops(msg, sk, skb); | |
876 | } | |
767dd033 | 877 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); |
3b885787 | 878 | |
8c3c447b | 879 | INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *, |
a648a592 PA |
880 | size_t, int)); |
881 | INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *, | |
882 | size_t, int)); | |
1b784140 | 883 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
2da62906 | 884 | int flags) |
1da177e4 | 885 | { |
a648a592 PA |
886 | return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg, |
887 | inet_recvmsg, sock, msg, msg_data_left(msg), | |
888 | flags); | |
1da177e4 LT |
889 | } |
890 | ||
85806af0 RD |
891 | /** |
892 | * sock_recvmsg - receive a message from @sock | |
893 | * @sock: socket | |
894 | * @msg: message to receive | |
895 | * @flags: message flags | |
896 | * | |
897 | * Receives @msg from @sock, passing through LSM. Returns the total number | |
898 | * of bytes received, or an error. | |
899 | */ | |
2da62906 | 900 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) |
a2e27255 | 901 | { |
2da62906 | 902 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); |
a2e27255 | 903 | |
2da62906 | 904 | return err ?: sock_recvmsg_nosec(sock, msg, flags); |
1da177e4 | 905 | } |
c6d409cf | 906 | EXPORT_SYMBOL(sock_recvmsg); |
1da177e4 | 907 | |
c1249c0a | 908 | /** |
8a3c245c PT |
909 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
910 | * @sock: The socket to receive the message from | |
911 | * @msg: Received message | |
912 | * @vec: Input s/g array for message data | |
913 | * @num: Size of input s/g array | |
914 | * @size: Number of bytes to read | |
915 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
c1249c0a | 916 | * |
8a3c245c PT |
917 | * On return the msg structure contains the scatter/gather array passed in the |
918 | * vec argument. The array is modified so that it consists of the unfilled | |
919 | * portion of the original array. | |
c1249c0a | 920 | * |
8a3c245c | 921 | * The returned value is the total number of bytes received, or an error. |
c1249c0a | 922 | */ |
8a3c245c | 923 | |
89bddce5 SH |
924 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
925 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 | 926 | { |
1f466e1f | 927 | msg->msg_control_is_user = false; |
aa563d7b | 928 | iov_iter_kvec(&msg->msg_iter, READ, vec, num, size); |
1f466e1f | 929 | return sock_recvmsg(sock, msg, flags); |
1da177e4 | 930 | } |
c6d409cf | 931 | EXPORT_SYMBOL(kernel_recvmsg); |
1da177e4 | 932 | |
ce1d4d3e CH |
933 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
934 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 935 | { |
1da177e4 LT |
936 | struct socket *sock; |
937 | int flags; | |
938 | ||
ce1d4d3e CH |
939 | sock = file->private_data; |
940 | ||
35f9c09f ED |
941 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
942 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
943 | flags |= more; | |
ce1d4d3e | 944 | |
e6949583 | 945 | return kernel_sendpage(sock, page, offset, size, flags); |
ce1d4d3e | 946 | } |
1da177e4 | 947 | |
9c55e01c | 948 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 949 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c JA |
950 | unsigned int flags) |
951 | { | |
952 | struct socket *sock = file->private_data; | |
953 | ||
997b37da | 954 | if (unlikely(!sock->ops->splice_read)) |
95506588 | 955 | return generic_file_splice_read(file, ppos, pipe, len, flags); |
997b37da | 956 | |
9c55e01c JA |
957 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
958 | } | |
959 | ||
8ae5e030 | 960 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) |
ce1d4d3e | 961 | { |
6d652330 AV |
962 | struct file *file = iocb->ki_filp; |
963 | struct socket *sock = file->private_data; | |
0345f931 | 964 | struct msghdr msg = {.msg_iter = *to, |
965 | .msg_iocb = iocb}; | |
8ae5e030 | 966 | ssize_t res; |
ce1d4d3e | 967 | |
ebfcd895 | 968 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
969 | msg.msg_flags = MSG_DONTWAIT; |
970 | ||
971 | if (iocb->ki_pos != 0) | |
1da177e4 | 972 | return -ESPIPE; |
027445c3 | 973 | |
66ee59af | 974 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ |
1da177e4 LT |
975 | return 0; |
976 | ||
2da62906 | 977 | res = sock_recvmsg(sock, &msg, msg.msg_flags); |
8ae5e030 AV |
978 | *to = msg.msg_iter; |
979 | return res; | |
1da177e4 LT |
980 | } |
981 | ||
8ae5e030 | 982 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ce1d4d3e | 983 | { |
6d652330 AV |
984 | struct file *file = iocb->ki_filp; |
985 | struct socket *sock = file->private_data; | |
0345f931 | 986 | struct msghdr msg = {.msg_iter = *from, |
987 | .msg_iocb = iocb}; | |
8ae5e030 | 988 | ssize_t res; |
1da177e4 | 989 | |
8ae5e030 | 990 | if (iocb->ki_pos != 0) |
ce1d4d3e | 991 | return -ESPIPE; |
027445c3 | 992 | |
ebfcd895 | 993 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
994 | msg.msg_flags = MSG_DONTWAIT; |
995 | ||
6d652330 AV |
996 | if (sock->type == SOCK_SEQPACKET) |
997 | msg.msg_flags |= MSG_EOR; | |
998 | ||
d8725c86 | 999 | res = sock_sendmsg(sock, &msg); |
8ae5e030 AV |
1000 | *from = msg.msg_iter; |
1001 | return res; | |
1da177e4 LT |
1002 | } |
1003 | ||
1da177e4 LT |
1004 | /* |
1005 | * Atomic setting of ioctl hooks to avoid race | |
1006 | * with module unload. | |
1007 | */ | |
1008 | ||
4a3e2f71 | 1009 | static DEFINE_MUTEX(br_ioctl_mutex); |
c6d409cf | 1010 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); |
1da177e4 | 1011 | |
881d966b | 1012 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
1da177e4 | 1013 | { |
4a3e2f71 | 1014 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 1015 | br_ioctl_hook = hook; |
4a3e2f71 | 1016 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1017 | } |
1018 | EXPORT_SYMBOL(brioctl_set); | |
1019 | ||
4a3e2f71 | 1020 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 1021 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 1022 | |
881d966b | 1023 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 1024 | { |
4a3e2f71 | 1025 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1026 | vlan_ioctl_hook = hook; |
4a3e2f71 | 1027 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 LT |
1028 | } |
1029 | EXPORT_SYMBOL(vlan_ioctl_set); | |
1030 | ||
6b96018b | 1031 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
63ff03ab | 1032 | unsigned int cmd, unsigned long arg) |
6b96018b AB |
1033 | { |
1034 | int err; | |
1035 | void __user *argp = (void __user *)arg; | |
1036 | ||
1037 | err = sock->ops->ioctl(sock, cmd, arg); | |
1038 | ||
1039 | /* | |
1040 | * If this ioctl is unknown try to hand it down | |
1041 | * to the NIC driver. | |
1042 | */ | |
36fd633e AV |
1043 | if (err != -ENOIOCTLCMD) |
1044 | return err; | |
6b96018b | 1045 | |
36fd633e AV |
1046 | if (cmd == SIOCGIFCONF) { |
1047 | struct ifconf ifc; | |
1048 | if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) | |
1049 | return -EFAULT; | |
1050 | rtnl_lock(); | |
1051 | err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); | |
1052 | rtnl_unlock(); | |
1053 | if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) | |
1054 | err = -EFAULT; | |
44c02a2c AV |
1055 | } else { |
1056 | struct ifreq ifr; | |
1057 | bool need_copyout; | |
63ff03ab | 1058 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) |
44c02a2c AV |
1059 | return -EFAULT; |
1060 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); | |
1061 | if (!err && need_copyout) | |
63ff03ab | 1062 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) |
44c02a2c | 1063 | return -EFAULT; |
36fd633e | 1064 | } |
6b96018b AB |
1065 | return err; |
1066 | } | |
1067 | ||
1da177e4 LT |
1068 | /* |
1069 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
1070 | * what to do with it - that's up to the protocol still. | |
1071 | */ | |
1072 | ||
8a3c245c PT |
1073 | /** |
1074 | * get_net_ns - increment the refcount of the network namespace | |
1075 | * @ns: common namespace (net) | |
1076 | * | |
1077 | * Returns the net's common namespace. | |
1078 | */ | |
1079 | ||
d8d211a2 | 1080 | struct ns_common *get_net_ns(struct ns_common *ns) |
c62cce2c AV |
1081 | { |
1082 | return &get_net(container_of(ns, struct net, ns))->ns; | |
1083 | } | |
d8d211a2 | 1084 | EXPORT_SYMBOL_GPL(get_net_ns); |
c62cce2c | 1085 | |
1da177e4 LT |
1086 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1087 | { | |
1088 | struct socket *sock; | |
881d966b | 1089 | struct sock *sk; |
1da177e4 LT |
1090 | void __user *argp = (void __user *)arg; |
1091 | int pid, err; | |
881d966b | 1092 | struct net *net; |
1da177e4 | 1093 | |
b69aee04 | 1094 | sock = file->private_data; |
881d966b | 1095 | sk = sock->sk; |
3b1e0a65 | 1096 | net = sock_net(sk); |
44c02a2c AV |
1097 | if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { |
1098 | struct ifreq ifr; | |
1099 | bool need_copyout; | |
1100 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) | |
1101 | return -EFAULT; | |
1102 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); | |
1103 | if (!err && need_copyout) | |
1104 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) | |
1105 | return -EFAULT; | |
1da177e4 | 1106 | } else |
3d23e349 | 1107 | #ifdef CONFIG_WEXT_CORE |
1da177e4 | 1108 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
b1b0c245 | 1109 | err = wext_handle_ioctl(net, cmd, argp); |
1da177e4 | 1110 | } else |
3d23e349 | 1111 | #endif |
89bddce5 | 1112 | switch (cmd) { |
1da177e4 LT |
1113 | case FIOSETOWN: |
1114 | case SIOCSPGRP: | |
1115 | err = -EFAULT; | |
1116 | if (get_user(pid, (int __user *)argp)) | |
1117 | break; | |
393cc3f5 | 1118 | err = f_setown(sock->file, pid, 1); |
1da177e4 LT |
1119 | break; |
1120 | case FIOGETOWN: | |
1121 | case SIOCGPGRP: | |
609d7fa9 | 1122 | err = put_user(f_getown(sock->file), |
89bddce5 | 1123 | (int __user *)argp); |
1da177e4 LT |
1124 | break; |
1125 | case SIOCGIFBR: | |
1126 | case SIOCSIFBR: | |
1127 | case SIOCBRADDBR: | |
1128 | case SIOCBRDELBR: | |
1129 | err = -ENOPKG; | |
1130 | if (!br_ioctl_hook) | |
1131 | request_module("bridge"); | |
1132 | ||
4a3e2f71 | 1133 | mutex_lock(&br_ioctl_mutex); |
89bddce5 | 1134 | if (br_ioctl_hook) |
881d966b | 1135 | err = br_ioctl_hook(net, cmd, argp); |
4a3e2f71 | 1136 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1137 | break; |
1138 | case SIOCGIFVLAN: | |
1139 | case SIOCSIFVLAN: | |
1140 | err = -ENOPKG; | |
1141 | if (!vlan_ioctl_hook) | |
1142 | request_module("8021q"); | |
1143 | ||
4a3e2f71 | 1144 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1145 | if (vlan_ioctl_hook) |
881d966b | 1146 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 1147 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 1148 | break; |
c62cce2c AV |
1149 | case SIOCGSKNS: |
1150 | err = -EPERM; | |
1151 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1152 | break; | |
1153 | ||
1154 | err = open_related_ns(&net->ns, get_net_ns); | |
1155 | break; | |
0768e170 AB |
1156 | case SIOCGSTAMP_OLD: |
1157 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
1158 | if (!sock->ops->gettstamp) { |
1159 | err = -ENOIOCTLCMD; | |
1160 | break; | |
1161 | } | |
1162 | err = sock->ops->gettstamp(sock, argp, | |
0768e170 AB |
1163 | cmd == SIOCGSTAMP_OLD, |
1164 | !IS_ENABLED(CONFIG_64BIT)); | |
60747828 | 1165 | break; |
0768e170 AB |
1166 | case SIOCGSTAMP_NEW: |
1167 | case SIOCGSTAMPNS_NEW: | |
1168 | if (!sock->ops->gettstamp) { | |
1169 | err = -ENOIOCTLCMD; | |
1170 | break; | |
1171 | } | |
1172 | err = sock->ops->gettstamp(sock, argp, | |
1173 | cmd == SIOCGSTAMP_NEW, | |
1174 | false); | |
c7cbdbf2 | 1175 | break; |
1da177e4 | 1176 | default: |
63ff03ab | 1177 | err = sock_do_ioctl(net, sock, cmd, arg); |
1da177e4 | 1178 | break; |
89bddce5 | 1179 | } |
1da177e4 LT |
1180 | return err; |
1181 | } | |
1182 | ||
8a3c245c PT |
1183 | /** |
1184 | * sock_create_lite - creates a socket | |
1185 | * @family: protocol family (AF_INET, ...) | |
1186 | * @type: communication type (SOCK_STREAM, ...) | |
1187 | * @protocol: protocol (0, ...) | |
1188 | * @res: new socket | |
1189 | * | |
1190 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1191 | * The new socket initialization is not complete, see kernel_accept(). | |
1192 | * Returns 0 or an error. On failure @res is set to %NULL. | |
1193 | * This function internally uses GFP_KERNEL. | |
1194 | */ | |
1195 | ||
1da177e4 LT |
1196 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
1197 | { | |
1198 | int err; | |
1199 | struct socket *sock = NULL; | |
89bddce5 | 1200 | |
1da177e4 LT |
1201 | err = security_socket_create(family, type, protocol, 1); |
1202 | if (err) | |
1203 | goto out; | |
1204 | ||
1205 | sock = sock_alloc(); | |
1206 | if (!sock) { | |
1207 | err = -ENOMEM; | |
1208 | goto out; | |
1209 | } | |
1210 | ||
1da177e4 | 1211 | sock->type = type; |
7420ed23 VY |
1212 | err = security_socket_post_create(sock, family, type, protocol, 1); |
1213 | if (err) | |
1214 | goto out_release; | |
1215 | ||
1da177e4 LT |
1216 | out: |
1217 | *res = sock; | |
1218 | return err; | |
7420ed23 VY |
1219 | out_release: |
1220 | sock_release(sock); | |
1221 | sock = NULL; | |
1222 | goto out; | |
1da177e4 | 1223 | } |
c6d409cf | 1224 | EXPORT_SYMBOL(sock_create_lite); |
1da177e4 LT |
1225 | |
1226 | /* No kernel lock held - perfect */ | |
ade994f4 | 1227 | static __poll_t sock_poll(struct file *file, poll_table *wait) |
1da177e4 | 1228 | { |
3cafb376 | 1229 | struct socket *sock = file->private_data; |
a331de3b | 1230 | __poll_t events = poll_requested_events(wait), flag = 0; |
2d48d67f | 1231 | |
e88958e6 CH |
1232 | if (!sock->ops->poll) |
1233 | return 0; | |
f641f13b | 1234 | |
a331de3b CH |
1235 | if (sk_can_busy_loop(sock->sk)) { |
1236 | /* poll once if requested by the syscall */ | |
1237 | if (events & POLL_BUSY_LOOP) | |
1238 | sk_busy_loop(sock->sk, 1); | |
1239 | ||
1240 | /* if this socket can poll_ll, tell the system call */ | |
1241 | flag = POLL_BUSY_LOOP; | |
1242 | } | |
1243 | ||
1244 | return sock->ops->poll(file, sock, wait) | flag; | |
1da177e4 LT |
1245 | } |
1246 | ||
89bddce5 | 1247 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 1248 | { |
b69aee04 | 1249 | struct socket *sock = file->private_data; |
1da177e4 LT |
1250 | |
1251 | return sock->ops->mmap(file, sock, vma); | |
1252 | } | |
1253 | ||
20380731 | 1254 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 | 1255 | { |
6d8c50dc | 1256 | __sock_release(SOCKET_I(inode), inode); |
1da177e4 LT |
1257 | return 0; |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * Update the socket async list | |
1262 | * | |
1263 | * Fasync_list locking strategy. | |
1264 | * | |
1265 | * 1. fasync_list is modified only under process context socket lock | |
1266 | * i.e. under semaphore. | |
1267 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
989a2979 | 1268 | * or under socket lock |
1da177e4 LT |
1269 | */ |
1270 | ||
1271 | static int sock_fasync(int fd, struct file *filp, int on) | |
1272 | { | |
989a2979 ED |
1273 | struct socket *sock = filp->private_data; |
1274 | struct sock *sk = sock->sk; | |
333f7909 | 1275 | struct socket_wq *wq = &sock->wq; |
1da177e4 | 1276 | |
989a2979 | 1277 | if (sk == NULL) |
1da177e4 | 1278 | return -EINVAL; |
1da177e4 LT |
1279 | |
1280 | lock_sock(sk); | |
eaefd110 | 1281 | fasync_helper(fd, filp, on, &wq->fasync_list); |
1da177e4 | 1282 | |
eaefd110 | 1283 | if (!wq->fasync_list) |
989a2979 ED |
1284 | sock_reset_flag(sk, SOCK_FASYNC); |
1285 | else | |
bcdce719 | 1286 | sock_set_flag(sk, SOCK_FASYNC); |
1da177e4 | 1287 | |
989a2979 | 1288 | release_sock(sk); |
1da177e4 LT |
1289 | return 0; |
1290 | } | |
1291 | ||
ceb5d58b | 1292 | /* This function may be called only under rcu_lock */ |
1da177e4 | 1293 | |
ceb5d58b | 1294 | int sock_wake_async(struct socket_wq *wq, int how, int band) |
1da177e4 | 1295 | { |
ceb5d58b | 1296 | if (!wq || !wq->fasync_list) |
1da177e4 | 1297 | return -1; |
ceb5d58b | 1298 | |
89bddce5 | 1299 | switch (how) { |
8d8ad9d7 | 1300 | case SOCK_WAKE_WAITD: |
ceb5d58b | 1301 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) |
1da177e4 LT |
1302 | break; |
1303 | goto call_kill; | |
8d8ad9d7 | 1304 | case SOCK_WAKE_SPACE: |
ceb5d58b | 1305 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) |
1da177e4 | 1306 | break; |
7c7ab580 | 1307 | fallthrough; |
8d8ad9d7 | 1308 | case SOCK_WAKE_IO: |
89bddce5 | 1309 | call_kill: |
43815482 | 1310 | kill_fasync(&wq->fasync_list, SIGIO, band); |
1da177e4 | 1311 | break; |
8d8ad9d7 | 1312 | case SOCK_WAKE_URG: |
43815482 | 1313 | kill_fasync(&wq->fasync_list, SIGURG, band); |
1da177e4 | 1314 | } |
ceb5d58b | 1315 | |
1da177e4 LT |
1316 | return 0; |
1317 | } | |
c6d409cf | 1318 | EXPORT_SYMBOL(sock_wake_async); |
1da177e4 | 1319 | |
8a3c245c PT |
1320 | /** |
1321 | * __sock_create - creates a socket | |
1322 | * @net: net namespace | |
1323 | * @family: protocol family (AF_INET, ...) | |
1324 | * @type: communication type (SOCK_STREAM, ...) | |
1325 | * @protocol: protocol (0, ...) | |
1326 | * @res: new socket | |
1327 | * @kern: boolean for kernel space sockets | |
1328 | * | |
1329 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1330 | * Returns 0 or an error. On failure @res is set to %NULL. @kern must | |
1331 | * be set to true if the socket resides in kernel space. | |
1332 | * This function internally uses GFP_KERNEL. | |
1333 | */ | |
1334 | ||
721db93a | 1335 | int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1336 | struct socket **res, int kern) |
1da177e4 LT |
1337 | { |
1338 | int err; | |
1339 | struct socket *sock; | |
55737fda | 1340 | const struct net_proto_family *pf; |
1da177e4 LT |
1341 | |
1342 | /* | |
89bddce5 | 1343 | * Check protocol is in range |
1da177e4 LT |
1344 | */ |
1345 | if (family < 0 || family >= NPROTO) | |
1346 | return -EAFNOSUPPORT; | |
1347 | if (type < 0 || type >= SOCK_MAX) | |
1348 | return -EINVAL; | |
1349 | ||
1350 | /* Compatibility. | |
1351 | ||
1352 | This uglymoron is moved from INET layer to here to avoid | |
1353 | deadlock in module load. | |
1354 | */ | |
1355 | if (family == PF_INET && type == SOCK_PACKET) { | |
f3c98690 | 1356 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1357 | current->comm); | |
1da177e4 LT |
1358 | family = PF_PACKET; |
1359 | } | |
1360 | ||
1361 | err = security_socket_create(family, type, protocol, kern); | |
1362 | if (err) | |
1363 | return err; | |
89bddce5 | 1364 | |
55737fda SH |
1365 | /* |
1366 | * Allocate the socket and allow the family to set things up. if | |
1367 | * the protocol is 0, the family is instructed to select an appropriate | |
1368 | * default. | |
1369 | */ | |
1370 | sock = sock_alloc(); | |
1371 | if (!sock) { | |
e87cc472 | 1372 | net_warn_ratelimited("socket: no more sockets\n"); |
55737fda SH |
1373 | return -ENFILE; /* Not exactly a match, but its the |
1374 | closest posix thing */ | |
1375 | } | |
1376 | ||
1377 | sock->type = type; | |
1378 | ||
95a5afca | 1379 | #ifdef CONFIG_MODULES |
89bddce5 SH |
1380 | /* Attempt to load a protocol module if the find failed. |
1381 | * | |
1382 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1383 | * requested real, full-featured networking support upon configuration. |
1384 | * Otherwise module support will break! | |
1385 | */ | |
190683a9 | 1386 | if (rcu_access_pointer(net_families[family]) == NULL) |
89bddce5 | 1387 | request_module("net-pf-%d", family); |
1da177e4 LT |
1388 | #endif |
1389 | ||
55737fda SH |
1390 | rcu_read_lock(); |
1391 | pf = rcu_dereference(net_families[family]); | |
1392 | err = -EAFNOSUPPORT; | |
1393 | if (!pf) | |
1394 | goto out_release; | |
1da177e4 LT |
1395 | |
1396 | /* | |
1397 | * We will call the ->create function, that possibly is in a loadable | |
1398 | * module, so we have to bump that loadable module refcnt first. | |
1399 | */ | |
55737fda | 1400 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1401 | goto out_release; |
1402 | ||
55737fda SH |
1403 | /* Now protected by module ref count */ |
1404 | rcu_read_unlock(); | |
1405 | ||
3f378b68 | 1406 | err = pf->create(net, sock, protocol, kern); |
55737fda | 1407 | if (err < 0) |
1da177e4 | 1408 | goto out_module_put; |
a79af59e | 1409 | |
1da177e4 LT |
1410 | /* |
1411 | * Now to bump the refcnt of the [loadable] module that owns this | |
1412 | * socket at sock_release time we decrement its refcnt. | |
1413 | */ | |
55737fda SH |
1414 | if (!try_module_get(sock->ops->owner)) |
1415 | goto out_module_busy; | |
1416 | ||
1da177e4 LT |
1417 | /* |
1418 | * Now that we're done with the ->create function, the [loadable] | |
1419 | * module can have its refcnt decremented | |
1420 | */ | |
55737fda | 1421 | module_put(pf->owner); |
7420ed23 VY |
1422 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1423 | if (err) | |
3b185525 | 1424 | goto out_sock_release; |
55737fda | 1425 | *res = sock; |
1da177e4 | 1426 | |
55737fda SH |
1427 | return 0; |
1428 | ||
1429 | out_module_busy: | |
1430 | err = -EAFNOSUPPORT; | |
1da177e4 | 1431 | out_module_put: |
55737fda SH |
1432 | sock->ops = NULL; |
1433 | module_put(pf->owner); | |
1434 | out_sock_release: | |
1da177e4 | 1435 | sock_release(sock); |
55737fda SH |
1436 | return err; |
1437 | ||
1438 | out_release: | |
1439 | rcu_read_unlock(); | |
1440 | goto out_sock_release; | |
1da177e4 | 1441 | } |
721db93a | 1442 | EXPORT_SYMBOL(__sock_create); |
1da177e4 | 1443 | |
8a3c245c PT |
1444 | /** |
1445 | * sock_create - creates a socket | |
1446 | * @family: protocol family (AF_INET, ...) | |
1447 | * @type: communication type (SOCK_STREAM, ...) | |
1448 | * @protocol: protocol (0, ...) | |
1449 | * @res: new socket | |
1450 | * | |
1451 | * A wrapper around __sock_create(). | |
1452 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1453 | */ | |
1454 | ||
1da177e4 LT |
1455 | int sock_create(int family, int type, int protocol, struct socket **res) |
1456 | { | |
1b8d7ae4 | 1457 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 | 1458 | } |
c6d409cf | 1459 | EXPORT_SYMBOL(sock_create); |
1da177e4 | 1460 | |
8a3c245c PT |
1461 | /** |
1462 | * sock_create_kern - creates a socket (kernel space) | |
1463 | * @net: net namespace | |
1464 | * @family: protocol family (AF_INET, ...) | |
1465 | * @type: communication type (SOCK_STREAM, ...) | |
1466 | * @protocol: protocol (0, ...) | |
1467 | * @res: new socket | |
1468 | * | |
1469 | * A wrapper around __sock_create(). | |
1470 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1471 | */ | |
1472 | ||
eeb1bd5c | 1473 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) |
1da177e4 | 1474 | { |
eeb1bd5c | 1475 | return __sock_create(net, family, type, protocol, res, 1); |
1da177e4 | 1476 | } |
c6d409cf | 1477 | EXPORT_SYMBOL(sock_create_kern); |
1da177e4 | 1478 | |
9d6a15c3 | 1479 | int __sys_socket(int family, int type, int protocol) |
1da177e4 LT |
1480 | { |
1481 | int retval; | |
1482 | struct socket *sock; | |
a677a039 UD |
1483 | int flags; |
1484 | ||
e38b36f3 UD |
1485 | /* Check the SOCK_* constants for consistency. */ |
1486 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1487 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1488 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1489 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1490 | ||
a677a039 | 1491 | flags = type & ~SOCK_TYPE_MASK; |
77d27200 | 1492 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1493 | return -EINVAL; |
1494 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1495 | |
aaca0bdc UD |
1496 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1497 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1498 | ||
1da177e4 LT |
1499 | retval = sock_create(family, type, protocol, &sock); |
1500 | if (retval < 0) | |
8e1611e2 | 1501 | return retval; |
1da177e4 | 1502 | |
8e1611e2 | 1503 | return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1da177e4 LT |
1504 | } |
1505 | ||
9d6a15c3 DB |
1506 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
1507 | { | |
1508 | return __sys_socket(family, type, protocol); | |
1509 | } | |
1510 | ||
1da177e4 LT |
1511 | /* |
1512 | * Create a pair of connected sockets. | |
1513 | */ | |
1514 | ||
6debc8d8 | 1515 | int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) |
1da177e4 LT |
1516 | { |
1517 | struct socket *sock1, *sock2; | |
1518 | int fd1, fd2, err; | |
db349509 | 1519 | struct file *newfile1, *newfile2; |
a677a039 UD |
1520 | int flags; |
1521 | ||
1522 | flags = type & ~SOCK_TYPE_MASK; | |
77d27200 | 1523 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1524 | return -EINVAL; |
1525 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1526 | |
aaca0bdc UD |
1527 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1528 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1529 | ||
016a266b AV |
1530 | /* |
1531 | * reserve descriptors and make sure we won't fail | |
1532 | * to return them to userland. | |
1533 | */ | |
1534 | fd1 = get_unused_fd_flags(flags); | |
1535 | if (unlikely(fd1 < 0)) | |
1536 | return fd1; | |
1537 | ||
1538 | fd2 = get_unused_fd_flags(flags); | |
1539 | if (unlikely(fd2 < 0)) { | |
1540 | put_unused_fd(fd1); | |
1541 | return fd2; | |
1542 | } | |
1543 | ||
1544 | err = put_user(fd1, &usockvec[0]); | |
1545 | if (err) | |
1546 | goto out; | |
1547 | ||
1548 | err = put_user(fd2, &usockvec[1]); | |
1549 | if (err) | |
1550 | goto out; | |
1551 | ||
1da177e4 LT |
1552 | /* |
1553 | * Obtain the first socket and check if the underlying protocol | |
1554 | * supports the socketpair call. | |
1555 | */ | |
1556 | ||
1557 | err = sock_create(family, type, protocol, &sock1); | |
016a266b | 1558 | if (unlikely(err < 0)) |
1da177e4 LT |
1559 | goto out; |
1560 | ||
1561 | err = sock_create(family, type, protocol, &sock2); | |
016a266b AV |
1562 | if (unlikely(err < 0)) { |
1563 | sock_release(sock1); | |
1564 | goto out; | |
bf3c23d1 | 1565 | } |
d73aa286 | 1566 | |
d47cd945 DH |
1567 | err = security_socket_socketpair(sock1, sock2); |
1568 | if (unlikely(err)) { | |
1569 | sock_release(sock2); | |
1570 | sock_release(sock1); | |
1571 | goto out; | |
1572 | } | |
1573 | ||
016a266b AV |
1574 | err = sock1->ops->socketpair(sock1, sock2); |
1575 | if (unlikely(err < 0)) { | |
1576 | sock_release(sock2); | |
1577 | sock_release(sock1); | |
1578 | goto out; | |
28407630 AV |
1579 | } |
1580 | ||
aab174f0 | 1581 | newfile1 = sock_alloc_file(sock1, flags, NULL); |
b5ffe634 | 1582 | if (IS_ERR(newfile1)) { |
28407630 | 1583 | err = PTR_ERR(newfile1); |
016a266b AV |
1584 | sock_release(sock2); |
1585 | goto out; | |
28407630 AV |
1586 | } |
1587 | ||
aab174f0 | 1588 | newfile2 = sock_alloc_file(sock2, flags, NULL); |
28407630 AV |
1589 | if (IS_ERR(newfile2)) { |
1590 | err = PTR_ERR(newfile2); | |
016a266b AV |
1591 | fput(newfile1); |
1592 | goto out; | |
db349509 AV |
1593 | } |
1594 | ||
157cf649 | 1595 | audit_fd_pair(fd1, fd2); |
d73aa286 | 1596 | |
db349509 AV |
1597 | fd_install(fd1, newfile1); |
1598 | fd_install(fd2, newfile2); | |
d73aa286 | 1599 | return 0; |
1da177e4 | 1600 | |
016a266b | 1601 | out: |
d73aa286 | 1602 | put_unused_fd(fd2); |
d73aa286 | 1603 | put_unused_fd(fd1); |
1da177e4 LT |
1604 | return err; |
1605 | } | |
1606 | ||
6debc8d8 DB |
1607 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
1608 | int __user *, usockvec) | |
1609 | { | |
1610 | return __sys_socketpair(family, type, protocol, usockvec); | |
1611 | } | |
1612 | ||
1da177e4 LT |
1613 | /* |
1614 | * Bind a name to a socket. Nothing much to do here since it's | |
1615 | * the protocol's responsibility to handle the local address. | |
1616 | * | |
1617 | * We move the socket address to kernel space before we call | |
1618 | * the protocol layer (having also checked the address is ok). | |
1619 | */ | |
1620 | ||
a87d35d8 | 1621 | int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
1da177e4 LT |
1622 | { |
1623 | struct socket *sock; | |
230b1839 | 1624 | struct sockaddr_storage address; |
6cb153ca | 1625 | int err, fput_needed; |
1da177e4 | 1626 | |
89bddce5 | 1627 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1628 | if (sock) { |
43db362d | 1629 | err = move_addr_to_kernel(umyaddr, addrlen, &address); |
068b88cc | 1630 | if (!err) { |
89bddce5 | 1631 | err = security_socket_bind(sock, |
230b1839 | 1632 | (struct sockaddr *)&address, |
89bddce5 | 1633 | addrlen); |
6cb153ca BL |
1634 | if (!err) |
1635 | err = sock->ops->bind(sock, | |
89bddce5 | 1636 | (struct sockaddr *) |
230b1839 | 1637 | &address, addrlen); |
1da177e4 | 1638 | } |
6cb153ca | 1639 | fput_light(sock->file, fput_needed); |
89bddce5 | 1640 | } |
1da177e4 LT |
1641 | return err; |
1642 | } | |
1643 | ||
a87d35d8 DB |
1644 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
1645 | { | |
1646 | return __sys_bind(fd, umyaddr, addrlen); | |
1647 | } | |
1648 | ||
1da177e4 LT |
1649 | /* |
1650 | * Perform a listen. Basically, we allow the protocol to do anything | |
1651 | * necessary for a listen, and if that works, we mark the socket as | |
1652 | * ready for listening. | |
1653 | */ | |
1654 | ||
25e290ee | 1655 | int __sys_listen(int fd, int backlog) |
1da177e4 LT |
1656 | { |
1657 | struct socket *sock; | |
6cb153ca | 1658 | int err, fput_needed; |
b8e1f9b5 | 1659 | int somaxconn; |
89bddce5 SH |
1660 | |
1661 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1662 | if (sock) { | |
8efa6e93 | 1663 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; |
95c96174 | 1664 | if ((unsigned int)backlog > somaxconn) |
b8e1f9b5 | 1665 | backlog = somaxconn; |
1da177e4 LT |
1666 | |
1667 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1668 | if (!err) |
1669 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1670 | |
6cb153ca | 1671 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1672 | } |
1673 | return err; | |
1674 | } | |
1675 | ||
25e290ee DB |
1676 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
1677 | { | |
1678 | return __sys_listen(fd, backlog); | |
1679 | } | |
1680 | ||
de2ea4b6 JA |
1681 | int __sys_accept4_file(struct file *file, unsigned file_flags, |
1682 | struct sockaddr __user *upeer_sockaddr, | |
09952e3e JA |
1683 | int __user *upeer_addrlen, int flags, |
1684 | unsigned long nofile) | |
1da177e4 LT |
1685 | { |
1686 | struct socket *sock, *newsock; | |
39d8c1b6 | 1687 | struct file *newfile; |
de2ea4b6 | 1688 | int err, len, newfd; |
230b1839 | 1689 | struct sockaddr_storage address; |
1da177e4 | 1690 | |
77d27200 | 1691 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
aaca0bdc UD |
1692 | return -EINVAL; |
1693 | ||
1694 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1695 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1696 | ||
dba4a925 FR |
1697 | sock = sock_from_file(file); |
1698 | if (!sock) { | |
1699 | err = -ENOTSOCK; | |
1da177e4 | 1700 | goto out; |
dba4a925 | 1701 | } |
1da177e4 LT |
1702 | |
1703 | err = -ENFILE; | |
c6d409cf ED |
1704 | newsock = sock_alloc(); |
1705 | if (!newsock) | |
de2ea4b6 | 1706 | goto out; |
1da177e4 LT |
1707 | |
1708 | newsock->type = sock->type; | |
1709 | newsock->ops = sock->ops; | |
1710 | ||
1da177e4 LT |
1711 | /* |
1712 | * We don't need try_module_get here, as the listening socket (sock) | |
1713 | * has the protocol module (sock->ops->owner) held. | |
1714 | */ | |
1715 | __module_get(newsock->ops->owner); | |
1716 | ||
09952e3e | 1717 | newfd = __get_unused_fd_flags(flags, nofile); |
39d8c1b6 DM |
1718 | if (unlikely(newfd < 0)) { |
1719 | err = newfd; | |
9a1875e6 | 1720 | sock_release(newsock); |
de2ea4b6 | 1721 | goto out; |
39d8c1b6 | 1722 | } |
aab174f0 | 1723 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); |
b5ffe634 | 1724 | if (IS_ERR(newfile)) { |
28407630 AV |
1725 | err = PTR_ERR(newfile); |
1726 | put_unused_fd(newfd); | |
de2ea4b6 | 1727 | goto out; |
28407630 | 1728 | } |
39d8c1b6 | 1729 | |
a79af59e FF |
1730 | err = security_socket_accept(sock, newsock); |
1731 | if (err) | |
39d8c1b6 | 1732 | goto out_fd; |
a79af59e | 1733 | |
de2ea4b6 JA |
1734 | err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags, |
1735 | false); | |
1da177e4 | 1736 | if (err < 0) |
39d8c1b6 | 1737 | goto out_fd; |
1da177e4 LT |
1738 | |
1739 | if (upeer_sockaddr) { | |
9b2c45d4 DV |
1740 | len = newsock->ops->getname(newsock, |
1741 | (struct sockaddr *)&address, 2); | |
1742 | if (len < 0) { | |
1da177e4 | 1743 | err = -ECONNABORTED; |
39d8c1b6 | 1744 | goto out_fd; |
1da177e4 | 1745 | } |
43db362d | 1746 | err = move_addr_to_user(&address, |
230b1839 | 1747 | len, upeer_sockaddr, upeer_addrlen); |
1da177e4 | 1748 | if (err < 0) |
39d8c1b6 | 1749 | goto out_fd; |
1da177e4 LT |
1750 | } |
1751 | ||
1752 | /* File flags are not inherited via accept() unlike another OSes. */ | |
1753 | ||
39d8c1b6 DM |
1754 | fd_install(newfd, newfile); |
1755 | err = newfd; | |
1da177e4 LT |
1756 | out: |
1757 | return err; | |
39d8c1b6 | 1758 | out_fd: |
9606a216 | 1759 | fput(newfile); |
39d8c1b6 | 1760 | put_unused_fd(newfd); |
de2ea4b6 JA |
1761 | goto out; |
1762 | ||
1763 | } | |
1764 | ||
1765 | /* | |
1766 | * For accept, we attempt to create a new socket, set up the link | |
1767 | * with the client, wake up the client, then return the new | |
1768 | * connected fd. We collect the address of the connector in kernel | |
1769 | * space and move it to user at the very end. This is unclean because | |
1770 | * we open the socket then return an error. | |
1771 | * | |
1772 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1773 | * status to recvmsg. We need to add that support in a way thats | |
1774 | * clean when we restructure accept also. | |
1775 | */ | |
1776 | ||
1777 | int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, | |
1778 | int __user *upeer_addrlen, int flags) | |
1779 | { | |
1780 | int ret = -EBADF; | |
1781 | struct fd f; | |
1782 | ||
1783 | f = fdget(fd); | |
1784 | if (f.file) { | |
1785 | ret = __sys_accept4_file(f.file, 0, upeer_sockaddr, | |
09952e3e JA |
1786 | upeer_addrlen, flags, |
1787 | rlimit(RLIMIT_NOFILE)); | |
6b07edeb | 1788 | fdput(f); |
de2ea4b6 JA |
1789 | } |
1790 | ||
1791 | return ret; | |
1da177e4 LT |
1792 | } |
1793 | ||
4541e805 DB |
1794 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1795 | int __user *, upeer_addrlen, int, flags) | |
1796 | { | |
1797 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); | |
1798 | } | |
1799 | ||
20f37034 HC |
1800 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1801 | int __user *, upeer_addrlen) | |
aaca0bdc | 1802 | { |
4541e805 | 1803 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
aaca0bdc UD |
1804 | } |
1805 | ||
1da177e4 LT |
1806 | /* |
1807 | * Attempt to connect to a socket with the server address. The address | |
1808 | * is in user space so we verify it is OK and move it to kernel space. | |
1809 | * | |
1810 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1811 | * break bindings | |
1812 | * | |
1813 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1814 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1815 | * include the -EINPROGRESS status for such sockets. | |
1816 | */ | |
1817 | ||
f499a021 | 1818 | int __sys_connect_file(struct file *file, struct sockaddr_storage *address, |
bd3ded31 | 1819 | int addrlen, int file_flags) |
1da177e4 LT |
1820 | { |
1821 | struct socket *sock; | |
bd3ded31 | 1822 | int err; |
1da177e4 | 1823 | |
dba4a925 FR |
1824 | sock = sock_from_file(file); |
1825 | if (!sock) { | |
1826 | err = -ENOTSOCK; | |
1da177e4 | 1827 | goto out; |
dba4a925 | 1828 | } |
1da177e4 | 1829 | |
89bddce5 | 1830 | err = |
f499a021 | 1831 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); |
1da177e4 | 1832 | if (err) |
bd3ded31 | 1833 | goto out; |
1da177e4 | 1834 | |
f499a021 | 1835 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
bd3ded31 | 1836 | sock->file->f_flags | file_flags); |
1da177e4 LT |
1837 | out: |
1838 | return err; | |
1839 | } | |
1840 | ||
bd3ded31 JA |
1841 | int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) |
1842 | { | |
1843 | int ret = -EBADF; | |
1844 | struct fd f; | |
1845 | ||
1846 | f = fdget(fd); | |
1847 | if (f.file) { | |
f499a021 JA |
1848 | struct sockaddr_storage address; |
1849 | ||
1850 | ret = move_addr_to_kernel(uservaddr, addrlen, &address); | |
1851 | if (!ret) | |
1852 | ret = __sys_connect_file(f.file, &address, addrlen, 0); | |
6b07edeb | 1853 | fdput(f); |
bd3ded31 JA |
1854 | } |
1855 | ||
1856 | return ret; | |
1857 | } | |
1858 | ||
1387c2c2 DB |
1859 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
1860 | int, addrlen) | |
1861 | { | |
1862 | return __sys_connect(fd, uservaddr, addrlen); | |
1863 | } | |
1864 | ||
1da177e4 LT |
1865 | /* |
1866 | * Get the local address ('name') of a socket object. Move the obtained | |
1867 | * name to user space. | |
1868 | */ | |
1869 | ||
8882a107 DB |
1870 | int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1871 | int __user *usockaddr_len) | |
1da177e4 LT |
1872 | { |
1873 | struct socket *sock; | |
230b1839 | 1874 | struct sockaddr_storage address; |
9b2c45d4 | 1875 | int err, fput_needed; |
89bddce5 | 1876 | |
6cb153ca | 1877 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1878 | if (!sock) |
1879 | goto out; | |
1880 | ||
1881 | err = security_socket_getsockname(sock); | |
1882 | if (err) | |
1883 | goto out_put; | |
1884 | ||
9b2c45d4 DV |
1885 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); |
1886 | if (err < 0) | |
1da177e4 | 1887 | goto out_put; |
9b2c45d4 DV |
1888 | /* "err" is actually length in this case */ |
1889 | err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); | |
1da177e4 LT |
1890 | |
1891 | out_put: | |
6cb153ca | 1892 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1893 | out: |
1894 | return err; | |
1895 | } | |
1896 | ||
8882a107 DB |
1897 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
1898 | int __user *, usockaddr_len) | |
1899 | { | |
1900 | return __sys_getsockname(fd, usockaddr, usockaddr_len); | |
1901 | } | |
1902 | ||
1da177e4 LT |
1903 | /* |
1904 | * Get the remote address ('name') of a socket object. Move the obtained | |
1905 | * name to user space. | |
1906 | */ | |
1907 | ||
b21c8f83 DB |
1908 | int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1909 | int __user *usockaddr_len) | |
1da177e4 LT |
1910 | { |
1911 | struct socket *sock; | |
230b1839 | 1912 | struct sockaddr_storage address; |
9b2c45d4 | 1913 | int err, fput_needed; |
1da177e4 | 1914 | |
89bddce5 SH |
1915 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1916 | if (sock != NULL) { | |
1da177e4 LT |
1917 | err = security_socket_getpeername(sock); |
1918 | if (err) { | |
6cb153ca | 1919 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1920 | return err; |
1921 | } | |
1922 | ||
9b2c45d4 DV |
1923 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); |
1924 | if (err >= 0) | |
1925 | /* "err" is actually length in this case */ | |
1926 | err = move_addr_to_user(&address, err, usockaddr, | |
89bddce5 | 1927 | usockaddr_len); |
6cb153ca | 1928 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1929 | } |
1930 | return err; | |
1931 | } | |
1932 | ||
b21c8f83 DB |
1933 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
1934 | int __user *, usockaddr_len) | |
1935 | { | |
1936 | return __sys_getpeername(fd, usockaddr, usockaddr_len); | |
1937 | } | |
1938 | ||
1da177e4 LT |
1939 | /* |
1940 | * Send a datagram to a given address. We move the address into kernel | |
1941 | * space and check the user space data area is readable before invoking | |
1942 | * the protocol. | |
1943 | */ | |
211b634b DB |
1944 | int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, |
1945 | struct sockaddr __user *addr, int addr_len) | |
1da177e4 LT |
1946 | { |
1947 | struct socket *sock; | |
230b1839 | 1948 | struct sockaddr_storage address; |
1da177e4 LT |
1949 | int err; |
1950 | struct msghdr msg; | |
1951 | struct iovec iov; | |
6cb153ca | 1952 | int fput_needed; |
6cb153ca | 1953 | |
602bd0e9 AV |
1954 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); |
1955 | if (unlikely(err)) | |
1956 | return err; | |
de0fa95c PE |
1957 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1958 | if (!sock) | |
4387ff75 | 1959 | goto out; |
6cb153ca | 1960 | |
89bddce5 | 1961 | msg.msg_name = NULL; |
89bddce5 SH |
1962 | msg.msg_control = NULL; |
1963 | msg.msg_controllen = 0; | |
1964 | msg.msg_namelen = 0; | |
6cb153ca | 1965 | if (addr) { |
43db362d | 1966 | err = move_addr_to_kernel(addr, addr_len, &address); |
1da177e4 LT |
1967 | if (err < 0) |
1968 | goto out_put; | |
230b1839 | 1969 | msg.msg_name = (struct sockaddr *)&address; |
89bddce5 | 1970 | msg.msg_namelen = addr_len; |
1da177e4 LT |
1971 | } |
1972 | if (sock->file->f_flags & O_NONBLOCK) | |
1973 | flags |= MSG_DONTWAIT; | |
1974 | msg.msg_flags = flags; | |
d8725c86 | 1975 | err = sock_sendmsg(sock, &msg); |
1da177e4 | 1976 | |
89bddce5 | 1977 | out_put: |
de0fa95c | 1978 | fput_light(sock->file, fput_needed); |
4387ff75 | 1979 | out: |
1da177e4 LT |
1980 | return err; |
1981 | } | |
1982 | ||
211b634b DB |
1983 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
1984 | unsigned int, flags, struct sockaddr __user *, addr, | |
1985 | int, addr_len) | |
1986 | { | |
1987 | return __sys_sendto(fd, buff, len, flags, addr, addr_len); | |
1988 | } | |
1989 | ||
1da177e4 | 1990 | /* |
89bddce5 | 1991 | * Send a datagram down a socket. |
1da177e4 LT |
1992 | */ |
1993 | ||
3e0fa65f | 1994 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
95c96174 | 1995 | unsigned int, flags) |
1da177e4 | 1996 | { |
211b634b | 1997 | return __sys_sendto(fd, buff, len, flags, NULL, 0); |
1da177e4 LT |
1998 | } |
1999 | ||
2000 | /* | |
89bddce5 | 2001 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
2002 | * sender. We verify the buffers are writable and if needed move the |
2003 | * sender address from kernel to user space. | |
2004 | */ | |
7a09e1eb DB |
2005 | int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, |
2006 | struct sockaddr __user *addr, int __user *addr_len) | |
1da177e4 LT |
2007 | { |
2008 | struct socket *sock; | |
2009 | struct iovec iov; | |
2010 | struct msghdr msg; | |
230b1839 | 2011 | struct sockaddr_storage address; |
89bddce5 | 2012 | int err, err2; |
6cb153ca BL |
2013 | int fput_needed; |
2014 | ||
602bd0e9 AV |
2015 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); |
2016 | if (unlikely(err)) | |
2017 | return err; | |
de0fa95c | 2018 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 2019 | if (!sock) |
de0fa95c | 2020 | goto out; |
1da177e4 | 2021 | |
89bddce5 SH |
2022 | msg.msg_control = NULL; |
2023 | msg.msg_controllen = 0; | |
f3d33426 HFS |
2024 | /* Save some cycles and don't copy the address if not needed */ |
2025 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; | |
2026 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
2027 | msg.msg_namelen = 0; | |
130ed5d1 | 2028 | msg.msg_iocb = NULL; |
9f138fa6 | 2029 | msg.msg_flags = 0; |
1da177e4 LT |
2030 | if (sock->file->f_flags & O_NONBLOCK) |
2031 | flags |= MSG_DONTWAIT; | |
2da62906 | 2032 | err = sock_recvmsg(sock, &msg, flags); |
1da177e4 | 2033 | |
89bddce5 | 2034 | if (err >= 0 && addr != NULL) { |
43db362d | 2035 | err2 = move_addr_to_user(&address, |
230b1839 | 2036 | msg.msg_namelen, addr, addr_len); |
89bddce5 SH |
2037 | if (err2 < 0) |
2038 | err = err2; | |
1da177e4 | 2039 | } |
de0fa95c PE |
2040 | |
2041 | fput_light(sock->file, fput_needed); | |
4387ff75 | 2042 | out: |
1da177e4 LT |
2043 | return err; |
2044 | } | |
2045 | ||
7a09e1eb DB |
2046 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
2047 | unsigned int, flags, struct sockaddr __user *, addr, | |
2048 | int __user *, addr_len) | |
2049 | { | |
2050 | return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); | |
2051 | } | |
2052 | ||
1da177e4 | 2053 | /* |
89bddce5 | 2054 | * Receive a datagram from a socket. |
1da177e4 LT |
2055 | */ |
2056 | ||
b7c0ddf5 JG |
2057 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, |
2058 | unsigned int, flags) | |
1da177e4 | 2059 | { |
7a09e1eb | 2060 | return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1da177e4 LT |
2061 | } |
2062 | ||
83f0c10b FW |
2063 | static bool sock_use_custom_sol_socket(const struct socket *sock) |
2064 | { | |
2065 | const struct sock *sk = sock->sk; | |
2066 | ||
2067 | /* Use sock->ops->setsockopt() for MPTCP */ | |
2068 | return IS_ENABLED(CONFIG_MPTCP) && | |
2069 | sk->sk_protocol == IPPROTO_MPTCP && | |
2070 | sk->sk_type == SOCK_STREAM && | |
2071 | (sk->sk_family == AF_INET || sk->sk_family == AF_INET6); | |
2072 | } | |
2073 | ||
1da177e4 LT |
2074 | /* |
2075 | * Set a socket option. Because we don't know the option lengths we have | |
2076 | * to pass the user mode parameter for the protocols to sort out. | |
2077 | */ | |
a7b75c5a | 2078 | int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval, |
55db9c0e | 2079 | int optlen) |
1da177e4 | 2080 | { |
519a8a6c | 2081 | sockptr_t optval = USER_SOCKPTR(user_optval); |
0d01da6a | 2082 | char *kernel_optval = NULL; |
6cb153ca | 2083 | int err, fput_needed; |
1da177e4 LT |
2084 | struct socket *sock; |
2085 | ||
2086 | if (optlen < 0) | |
2087 | return -EINVAL; | |
89bddce5 SH |
2088 | |
2089 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
4a367299 CH |
2090 | if (!sock) |
2091 | return err; | |
1da177e4 | 2092 | |
4a367299 CH |
2093 | err = security_socket_setsockopt(sock, level, optname); |
2094 | if (err) | |
2095 | goto out_put; | |
0d01da6a | 2096 | |
55db9c0e CH |
2097 | if (!in_compat_syscall()) |
2098 | err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname, | |
a7b75c5a | 2099 | user_optval, &optlen, |
55db9c0e | 2100 | &kernel_optval); |
4a367299 CH |
2101 | if (err < 0) |
2102 | goto out_put; | |
2103 | if (err > 0) { | |
2104 | err = 0; | |
2105 | goto out_put; | |
2106 | } | |
0d01da6a | 2107 | |
a7b75c5a CH |
2108 | if (kernel_optval) |
2109 | optval = KERNEL_SOCKPTR(kernel_optval); | |
4a367299 | 2110 | if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock)) |
a7b75c5a | 2111 | err = sock_setsockopt(sock, level, optname, optval, optlen); |
a44d9e72 CH |
2112 | else if (unlikely(!sock->ops->setsockopt)) |
2113 | err = -EOPNOTSUPP; | |
4a367299 CH |
2114 | else |
2115 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
89bddce5 | 2116 | optlen); |
a7b75c5a | 2117 | kfree(kernel_optval); |
4a367299 CH |
2118 | out_put: |
2119 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2120 | return err; |
2121 | } | |
2122 | ||
cc36dca0 DB |
2123 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
2124 | char __user *, optval, int, optlen) | |
2125 | { | |
2126 | return __sys_setsockopt(fd, level, optname, optval, optlen); | |
2127 | } | |
2128 | ||
1da177e4 LT |
2129 | /* |
2130 | * Get a socket option. Because we don't know the option lengths we have | |
2131 | * to pass a user mode parameter for the protocols to sort out. | |
2132 | */ | |
55db9c0e CH |
2133 | int __sys_getsockopt(int fd, int level, int optname, char __user *optval, |
2134 | int __user *optlen) | |
1da177e4 | 2135 | { |
6cb153ca | 2136 | int err, fput_needed; |
1da177e4 | 2137 | struct socket *sock; |
0d01da6a | 2138 | int max_optlen; |
1da177e4 | 2139 | |
89bddce5 | 2140 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
d8a9b38f CH |
2141 | if (!sock) |
2142 | return err; | |
2143 | ||
2144 | err = security_socket_getsockopt(sock, level, optname); | |
2145 | if (err) | |
2146 | goto out_put; | |
1da177e4 | 2147 | |
55db9c0e CH |
2148 | if (!in_compat_syscall()) |
2149 | max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); | |
0d01da6a | 2150 | |
d8a9b38f CH |
2151 | if (level == SOL_SOCKET) |
2152 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
a44d9e72 CH |
2153 | else if (unlikely(!sock->ops->getsockopt)) |
2154 | err = -EOPNOTSUPP; | |
d8a9b38f CH |
2155 | else |
2156 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
89bddce5 | 2157 | optlen); |
0d01da6a | 2158 | |
55db9c0e CH |
2159 | if (!in_compat_syscall()) |
2160 | err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, | |
2161 | optval, optlen, max_optlen, | |
2162 | err); | |
6cb153ca | 2163 | out_put: |
d8a9b38f | 2164 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2165 | return err; |
2166 | } | |
2167 | ||
13a2d70e DB |
2168 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
2169 | char __user *, optval, int __user *, optlen) | |
2170 | { | |
2171 | return __sys_getsockopt(fd, level, optname, optval, optlen); | |
2172 | } | |
2173 | ||
1da177e4 LT |
2174 | /* |
2175 | * Shutdown a socket. | |
2176 | */ | |
2177 | ||
005a1aea | 2178 | int __sys_shutdown(int fd, int how) |
1da177e4 | 2179 | { |
6cb153ca | 2180 | int err, fput_needed; |
1da177e4 LT |
2181 | struct socket *sock; |
2182 | ||
89bddce5 SH |
2183 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2184 | if (sock != NULL) { | |
1da177e4 | 2185 | err = security_socket_shutdown(sock, how); |
6cb153ca BL |
2186 | if (!err) |
2187 | err = sock->ops->shutdown(sock, how); | |
2188 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2189 | } |
2190 | return err; | |
2191 | } | |
2192 | ||
005a1aea DB |
2193 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
2194 | { | |
2195 | return __sys_shutdown(fd, how); | |
2196 | } | |
2197 | ||
89bddce5 | 2198 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
2199 | * fields which are the same type (int / unsigned) on our platforms. |
2200 | */ | |
2201 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
2202 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
2203 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
2204 | ||
c71d8ebe TH |
2205 | struct used_address { |
2206 | struct sockaddr_storage name; | |
2207 | unsigned int name_len; | |
2208 | }; | |
2209 | ||
0a384abf JA |
2210 | int __copy_msghdr_from_user(struct msghdr *kmsg, |
2211 | struct user_msghdr __user *umsg, | |
2212 | struct sockaddr __user **save_addr, | |
2213 | struct iovec __user **uiov, size_t *nsegs) | |
1661bf36 | 2214 | { |
ffb07550 | 2215 | struct user_msghdr msg; |
08adb7da AV |
2216 | ssize_t err; |
2217 | ||
ffb07550 | 2218 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) |
1661bf36 | 2219 | return -EFAULT; |
dbb490b9 | 2220 | |
1f466e1f CH |
2221 | kmsg->msg_control_is_user = true; |
2222 | kmsg->msg_control_user = msg.msg_control; | |
ffb07550 AV |
2223 | kmsg->msg_controllen = msg.msg_controllen; |
2224 | kmsg->msg_flags = msg.msg_flags; | |
2225 | ||
2226 | kmsg->msg_namelen = msg.msg_namelen; | |
2227 | if (!msg.msg_name) | |
6a2a2b3a AS |
2228 | kmsg->msg_namelen = 0; |
2229 | ||
dbb490b9 ML |
2230 | if (kmsg->msg_namelen < 0) |
2231 | return -EINVAL; | |
2232 | ||
1661bf36 | 2233 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
db31c55a | 2234 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); |
08adb7da AV |
2235 | |
2236 | if (save_addr) | |
ffb07550 | 2237 | *save_addr = msg.msg_name; |
08adb7da | 2238 | |
ffb07550 | 2239 | if (msg.msg_name && kmsg->msg_namelen) { |
08adb7da | 2240 | if (!save_addr) { |
864d9664 PA |
2241 | err = move_addr_to_kernel(msg.msg_name, |
2242 | kmsg->msg_namelen, | |
08adb7da AV |
2243 | kmsg->msg_name); |
2244 | if (err < 0) | |
2245 | return err; | |
2246 | } | |
2247 | } else { | |
2248 | kmsg->msg_name = NULL; | |
2249 | kmsg->msg_namelen = 0; | |
2250 | } | |
2251 | ||
ffb07550 | 2252 | if (msg.msg_iovlen > UIO_MAXIOV) |
08adb7da AV |
2253 | return -EMSGSIZE; |
2254 | ||
0345f931 | 2255 | kmsg->msg_iocb = NULL; |
0a384abf JA |
2256 | *uiov = msg.msg_iov; |
2257 | *nsegs = msg.msg_iovlen; | |
2258 | return 0; | |
2259 | } | |
2260 | ||
2261 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
2262 | struct user_msghdr __user *umsg, | |
2263 | struct sockaddr __user **save_addr, | |
2264 | struct iovec **iov) | |
2265 | { | |
2266 | struct user_msghdr msg; | |
2267 | ssize_t err; | |
2268 | ||
2269 | err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov, | |
2270 | &msg.msg_iovlen); | |
2271 | if (err) | |
2272 | return err; | |
0345f931 | 2273 | |
87e5e6da | 2274 | err = import_iovec(save_addr ? READ : WRITE, |
ffb07550 | 2275 | msg.msg_iov, msg.msg_iovlen, |
da184284 | 2276 | UIO_FASTIOV, iov, &kmsg->msg_iter); |
87e5e6da | 2277 | return err < 0 ? err : 0; |
1661bf36 DC |
2278 | } |
2279 | ||
4257c8ca JA |
2280 | static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys, |
2281 | unsigned int flags, struct used_address *used_address, | |
2282 | unsigned int allowed_msghdr_flags) | |
1da177e4 | 2283 | { |
b9d717a7 | 2284 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
846cc123 | 2285 | __aligned(sizeof(__kernel_size_t)); |
89bddce5 | 2286 | /* 20 is size of ipv6_pktinfo */ |
1da177e4 | 2287 | unsigned char *ctl_buf = ctl; |
d8725c86 | 2288 | int ctl_len; |
08adb7da | 2289 | ssize_t err; |
89bddce5 | 2290 | |
1da177e4 LT |
2291 | err = -ENOBUFS; |
2292 | ||
228e548e | 2293 | if (msg_sys->msg_controllen > INT_MAX) |
4257c8ca | 2294 | goto out; |
28a94d8f | 2295 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); |
228e548e | 2296 | ctl_len = msg_sys->msg_controllen; |
1da177e4 | 2297 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 | 2298 | err = |
228e548e | 2299 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
89bddce5 | 2300 | sizeof(ctl)); |
1da177e4 | 2301 | if (err) |
4257c8ca | 2302 | goto out; |
228e548e AB |
2303 | ctl_buf = msg_sys->msg_control; |
2304 | ctl_len = msg_sys->msg_controllen; | |
1da177e4 | 2305 | } else if (ctl_len) { |
ac4340fc DM |
2306 | BUILD_BUG_ON(sizeof(struct cmsghdr) != |
2307 | CMSG_ALIGN(sizeof(struct cmsghdr))); | |
89bddce5 | 2308 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 2309 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 2310 | if (ctl_buf == NULL) |
4257c8ca | 2311 | goto out; |
1da177e4 LT |
2312 | } |
2313 | err = -EFAULT; | |
1f466e1f | 2314 | if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len)) |
1da177e4 | 2315 | goto out_freectl; |
228e548e | 2316 | msg_sys->msg_control = ctl_buf; |
1f466e1f | 2317 | msg_sys->msg_control_is_user = false; |
1da177e4 | 2318 | } |
228e548e | 2319 | msg_sys->msg_flags = flags; |
1da177e4 LT |
2320 | |
2321 | if (sock->file->f_flags & O_NONBLOCK) | |
228e548e | 2322 | msg_sys->msg_flags |= MSG_DONTWAIT; |
c71d8ebe TH |
2323 | /* |
2324 | * If this is sendmmsg() and current destination address is same as | |
2325 | * previously succeeded address, omit asking LSM's decision. | |
2326 | * used_address->name_len is initialized to UINT_MAX so that the first | |
2327 | * destination address never matches. | |
2328 | */ | |
bc909d9d MD |
2329 | if (used_address && msg_sys->msg_name && |
2330 | used_address->name_len == msg_sys->msg_namelen && | |
2331 | !memcmp(&used_address->name, msg_sys->msg_name, | |
c71d8ebe | 2332 | used_address->name_len)) { |
d8725c86 | 2333 | err = sock_sendmsg_nosec(sock, msg_sys); |
c71d8ebe TH |
2334 | goto out_freectl; |
2335 | } | |
d8725c86 | 2336 | err = sock_sendmsg(sock, msg_sys); |
c71d8ebe TH |
2337 | /* |
2338 | * If this is sendmmsg() and sending to current destination address was | |
2339 | * successful, remember it. | |
2340 | */ | |
2341 | if (used_address && err >= 0) { | |
2342 | used_address->name_len = msg_sys->msg_namelen; | |
bc909d9d MD |
2343 | if (msg_sys->msg_name) |
2344 | memcpy(&used_address->name, msg_sys->msg_name, | |
2345 | used_address->name_len); | |
c71d8ebe | 2346 | } |
1da177e4 LT |
2347 | |
2348 | out_freectl: | |
89bddce5 | 2349 | if (ctl_buf != ctl) |
1da177e4 | 2350 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
4257c8ca JA |
2351 | out: |
2352 | return err; | |
2353 | } | |
2354 | ||
03b1230c JA |
2355 | int sendmsg_copy_msghdr(struct msghdr *msg, |
2356 | struct user_msghdr __user *umsg, unsigned flags, | |
2357 | struct iovec **iov) | |
4257c8ca JA |
2358 | { |
2359 | int err; | |
2360 | ||
2361 | if (flags & MSG_CMSG_COMPAT) { | |
2362 | struct compat_msghdr __user *msg_compat; | |
2363 | ||
2364 | msg_compat = (struct compat_msghdr __user *) umsg; | |
2365 | err = get_compat_msghdr(msg, msg_compat, NULL, iov); | |
2366 | } else { | |
2367 | err = copy_msghdr_from_user(msg, umsg, NULL, iov); | |
2368 | } | |
2369 | if (err < 0) | |
2370 | return err; | |
2371 | ||
2372 | return 0; | |
2373 | } | |
2374 | ||
2375 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2376 | struct msghdr *msg_sys, unsigned int flags, | |
2377 | struct used_address *used_address, | |
2378 | unsigned int allowed_msghdr_flags) | |
2379 | { | |
2380 | struct sockaddr_storage address; | |
2381 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2382 | ssize_t err; | |
2383 | ||
2384 | msg_sys->msg_name = &address; | |
2385 | ||
2386 | err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov); | |
2387 | if (err < 0) | |
2388 | return err; | |
2389 | ||
2390 | err = ____sys_sendmsg(sock, msg_sys, flags, used_address, | |
2391 | allowed_msghdr_flags); | |
da184284 | 2392 | kfree(iov); |
228e548e AB |
2393 | return err; |
2394 | } | |
2395 | ||
2396 | /* | |
2397 | * BSD sendmsg interface | |
2398 | */ | |
03b1230c | 2399 | long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg, |
0fa03c62 JA |
2400 | unsigned int flags) |
2401 | { | |
d69e0779 | 2402 | /* disallow ancillary data requests from this path */ |
03b1230c JA |
2403 | if (msg->msg_control || msg->msg_controllen) |
2404 | return -EINVAL; | |
d69e0779 | 2405 | |
03b1230c | 2406 | return ____sys_sendmsg(sock, msg, flags, NULL, 0); |
0fa03c62 | 2407 | } |
228e548e | 2408 | |
e1834a32 DB |
2409 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2410 | bool forbid_cmsg_compat) | |
228e548e AB |
2411 | { |
2412 | int fput_needed, err; | |
2413 | struct msghdr msg_sys; | |
1be374a0 AL |
2414 | struct socket *sock; |
2415 | ||
e1834a32 DB |
2416 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2417 | return -EINVAL; | |
2418 | ||
1be374a0 | 2419 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
228e548e AB |
2420 | if (!sock) |
2421 | goto out; | |
2422 | ||
28a94d8f | 2423 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); |
228e548e | 2424 | |
6cb153ca | 2425 | fput_light(sock->file, fput_needed); |
89bddce5 | 2426 | out: |
1da177e4 LT |
2427 | return err; |
2428 | } | |
2429 | ||
666547ff | 2430 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) |
a7526eb5 | 2431 | { |
e1834a32 | 2432 | return __sys_sendmsg(fd, msg, flags, true); |
a7526eb5 AL |
2433 | } |
2434 | ||
228e548e AB |
2435 | /* |
2436 | * Linux sendmmsg interface | |
2437 | */ | |
2438 | ||
2439 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
e1834a32 | 2440 | unsigned int flags, bool forbid_cmsg_compat) |
228e548e AB |
2441 | { |
2442 | int fput_needed, err, datagrams; | |
2443 | struct socket *sock; | |
2444 | struct mmsghdr __user *entry; | |
2445 | struct compat_mmsghdr __user *compat_entry; | |
2446 | struct msghdr msg_sys; | |
c71d8ebe | 2447 | struct used_address used_address; |
f092276d | 2448 | unsigned int oflags = flags; |
228e548e | 2449 | |
e1834a32 DB |
2450 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2451 | return -EINVAL; | |
2452 | ||
98382f41 AB |
2453 | if (vlen > UIO_MAXIOV) |
2454 | vlen = UIO_MAXIOV; | |
228e548e AB |
2455 | |
2456 | datagrams = 0; | |
2457 | ||
2458 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2459 | if (!sock) | |
2460 | return err; | |
2461 | ||
c71d8ebe | 2462 | used_address.name_len = UINT_MAX; |
228e548e AB |
2463 | entry = mmsg; |
2464 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
728ffb86 | 2465 | err = 0; |
f092276d | 2466 | flags |= MSG_BATCH; |
228e548e AB |
2467 | |
2468 | while (datagrams < vlen) { | |
f092276d TH |
2469 | if (datagrams == vlen - 1) |
2470 | flags = oflags; | |
2471 | ||
228e548e | 2472 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2473 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, |
28a94d8f | 2474 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2475 | if (err < 0) |
2476 | break; | |
2477 | err = __put_user(err, &compat_entry->msg_len); | |
2478 | ++compat_entry; | |
2479 | } else { | |
a7526eb5 | 2480 | err = ___sys_sendmsg(sock, |
666547ff | 2481 | (struct user_msghdr __user *)entry, |
28a94d8f | 2482 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2483 | if (err < 0) |
2484 | break; | |
2485 | err = put_user(err, &entry->msg_len); | |
2486 | ++entry; | |
2487 | } | |
2488 | ||
2489 | if (err) | |
2490 | break; | |
2491 | ++datagrams; | |
3023898b SHY |
2492 | if (msg_data_left(&msg_sys)) |
2493 | break; | |
a78cb84c | 2494 | cond_resched(); |
228e548e AB |
2495 | } |
2496 | ||
228e548e AB |
2497 | fput_light(sock->file, fput_needed); |
2498 | ||
728ffb86 AB |
2499 | /* We only return an error if no datagrams were able to be sent */ |
2500 | if (datagrams != 0) | |
228e548e AB |
2501 | return datagrams; |
2502 | ||
228e548e AB |
2503 | return err; |
2504 | } | |
2505 | ||
2506 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2507 | unsigned int, vlen, unsigned int, flags) | |
2508 | { | |
e1834a32 | 2509 | return __sys_sendmmsg(fd, mmsg, vlen, flags, true); |
228e548e AB |
2510 | } |
2511 | ||
03b1230c JA |
2512 | int recvmsg_copy_msghdr(struct msghdr *msg, |
2513 | struct user_msghdr __user *umsg, unsigned flags, | |
2514 | struct sockaddr __user **uaddr, | |
2515 | struct iovec **iov) | |
1da177e4 | 2516 | { |
08adb7da | 2517 | ssize_t err; |
1da177e4 | 2518 | |
4257c8ca JA |
2519 | if (MSG_CMSG_COMPAT & flags) { |
2520 | struct compat_msghdr __user *msg_compat; | |
1da177e4 | 2521 | |
4257c8ca JA |
2522 | msg_compat = (struct compat_msghdr __user *) umsg; |
2523 | err = get_compat_msghdr(msg, msg_compat, uaddr, iov); | |
2524 | } else { | |
2525 | err = copy_msghdr_from_user(msg, umsg, uaddr, iov); | |
2526 | } | |
1da177e4 | 2527 | if (err < 0) |
da184284 | 2528 | return err; |
1da177e4 | 2529 | |
4257c8ca JA |
2530 | return 0; |
2531 | } | |
2532 | ||
2533 | static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys, | |
2534 | struct user_msghdr __user *msg, | |
2535 | struct sockaddr __user *uaddr, | |
2536 | unsigned int flags, int nosec) | |
2537 | { | |
2538 | struct compat_msghdr __user *msg_compat = | |
2539 | (struct compat_msghdr __user *) msg; | |
2540 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2541 | struct sockaddr_storage addr; | |
2542 | unsigned long cmsg_ptr; | |
2543 | int len; | |
2544 | ssize_t err; | |
2545 | ||
2546 | msg_sys->msg_name = &addr; | |
a2e27255 ACM |
2547 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
2548 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
89bddce5 | 2549 | |
f3d33426 HFS |
2550 | /* We assume all kernel code knows the size of sockaddr_storage */ |
2551 | msg_sys->msg_namelen = 0; | |
2552 | ||
1da177e4 LT |
2553 | if (sock->file->f_flags & O_NONBLOCK) |
2554 | flags |= MSG_DONTWAIT; | |
1af66221 ED |
2555 | |
2556 | if (unlikely(nosec)) | |
2557 | err = sock_recvmsg_nosec(sock, msg_sys, flags); | |
2558 | else | |
2559 | err = sock_recvmsg(sock, msg_sys, flags); | |
2560 | ||
1da177e4 | 2561 | if (err < 0) |
4257c8ca | 2562 | goto out; |
1da177e4 LT |
2563 | len = err; |
2564 | ||
2565 | if (uaddr != NULL) { | |
43db362d | 2566 | err = move_addr_to_user(&addr, |
a2e27255 | 2567 | msg_sys->msg_namelen, uaddr, |
89bddce5 | 2568 | uaddr_len); |
1da177e4 | 2569 | if (err < 0) |
4257c8ca | 2570 | goto out; |
1da177e4 | 2571 | } |
a2e27255 | 2572 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
37f7f421 | 2573 | COMPAT_FLAGS(msg)); |
1da177e4 | 2574 | if (err) |
4257c8ca | 2575 | goto out; |
1da177e4 | 2576 | if (MSG_CMSG_COMPAT & flags) |
a2e27255 | 2577 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2578 | &msg_compat->msg_controllen); |
2579 | else | |
a2e27255 | 2580 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2581 | &msg->msg_controllen); |
2582 | if (err) | |
4257c8ca | 2583 | goto out; |
1da177e4 | 2584 | err = len; |
4257c8ca JA |
2585 | out: |
2586 | return err; | |
2587 | } | |
2588 | ||
2589 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2590 | struct msghdr *msg_sys, unsigned int flags, int nosec) | |
2591 | { | |
2592 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2593 | /* user mode address pointers */ | |
2594 | struct sockaddr __user *uaddr; | |
2595 | ssize_t err; | |
2596 | ||
2597 | err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov); | |
2598 | if (err < 0) | |
2599 | return err; | |
1da177e4 | 2600 | |
4257c8ca | 2601 | err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec); |
da184284 | 2602 | kfree(iov); |
a2e27255 ACM |
2603 | return err; |
2604 | } | |
2605 | ||
2606 | /* | |
2607 | * BSD recvmsg interface | |
2608 | */ | |
2609 | ||
03b1230c JA |
2610 | long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg, |
2611 | struct user_msghdr __user *umsg, | |
2612 | struct sockaddr __user *uaddr, unsigned int flags) | |
aa1fa28f | 2613 | { |
583bbf06 LH |
2614 | if (msg->msg_control || msg->msg_controllen) { |
2615 | /* disallow ancillary data reqs unless cmsg is plain data */ | |
2616 | if (!(sock->ops->flags & PROTO_CMSG_DATA_ONLY)) | |
2617 | return -EINVAL; | |
2618 | } | |
aa1fa28f | 2619 | |
03b1230c | 2620 | return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0); |
aa1fa28f JA |
2621 | } |
2622 | ||
e1834a32 DB |
2623 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2624 | bool forbid_cmsg_compat) | |
a2e27255 ACM |
2625 | { |
2626 | int fput_needed, err; | |
2627 | struct msghdr msg_sys; | |
1be374a0 AL |
2628 | struct socket *sock; |
2629 | ||
e1834a32 DB |
2630 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2631 | return -EINVAL; | |
2632 | ||
1be374a0 | 2633 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
a2e27255 ACM |
2634 | if (!sock) |
2635 | goto out; | |
2636 | ||
a7526eb5 | 2637 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
a2e27255 | 2638 | |
6cb153ca | 2639 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2640 | out: |
2641 | return err; | |
2642 | } | |
2643 | ||
666547ff | 2644 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, |
a7526eb5 AL |
2645 | unsigned int, flags) |
2646 | { | |
e1834a32 | 2647 | return __sys_recvmsg(fd, msg, flags, true); |
a7526eb5 AL |
2648 | } |
2649 | ||
a2e27255 ACM |
2650 | /* |
2651 | * Linux recvmmsg interface | |
2652 | */ | |
2653 | ||
e11d4284 AB |
2654 | static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2655 | unsigned int vlen, unsigned int flags, | |
2656 | struct timespec64 *timeout) | |
a2e27255 ACM |
2657 | { |
2658 | int fput_needed, err, datagrams; | |
2659 | struct socket *sock; | |
2660 | struct mmsghdr __user *entry; | |
d7256d0e | 2661 | struct compat_mmsghdr __user *compat_entry; |
a2e27255 | 2662 | struct msghdr msg_sys; |
766b9f92 DD |
2663 | struct timespec64 end_time; |
2664 | struct timespec64 timeout64; | |
a2e27255 ACM |
2665 | |
2666 | if (timeout && | |
2667 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2668 | timeout->tv_nsec)) | |
2669 | return -EINVAL; | |
2670 | ||
2671 | datagrams = 0; | |
2672 | ||
2673 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2674 | if (!sock) | |
2675 | return err; | |
2676 | ||
7797dc41 SHY |
2677 | if (likely(!(flags & MSG_ERRQUEUE))) { |
2678 | err = sock_error(sock->sk); | |
2679 | if (err) { | |
2680 | datagrams = err; | |
2681 | goto out_put; | |
2682 | } | |
e623a9e9 | 2683 | } |
a2e27255 ACM |
2684 | |
2685 | entry = mmsg; | |
d7256d0e | 2686 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
a2e27255 ACM |
2687 | |
2688 | while (datagrams < vlen) { | |
2689 | /* | |
2690 | * No need to ask LSM for more than the first datagram. | |
2691 | */ | |
d7256d0e | 2692 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2693 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, |
a7526eb5 AL |
2694 | &msg_sys, flags & ~MSG_WAITFORONE, |
2695 | datagrams); | |
d7256d0e JMG |
2696 | if (err < 0) |
2697 | break; | |
2698 | err = __put_user(err, &compat_entry->msg_len); | |
2699 | ++compat_entry; | |
2700 | } else { | |
a7526eb5 | 2701 | err = ___sys_recvmsg(sock, |
666547ff | 2702 | (struct user_msghdr __user *)entry, |
a7526eb5 AL |
2703 | &msg_sys, flags & ~MSG_WAITFORONE, |
2704 | datagrams); | |
d7256d0e JMG |
2705 | if (err < 0) |
2706 | break; | |
2707 | err = put_user(err, &entry->msg_len); | |
2708 | ++entry; | |
2709 | } | |
2710 | ||
a2e27255 ACM |
2711 | if (err) |
2712 | break; | |
a2e27255 ACM |
2713 | ++datagrams; |
2714 | ||
71c5c159 BB |
2715 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
2716 | if (flags & MSG_WAITFORONE) | |
2717 | flags |= MSG_DONTWAIT; | |
2718 | ||
a2e27255 | 2719 | if (timeout) { |
766b9f92 | 2720 | ktime_get_ts64(&timeout64); |
c2e6c856 | 2721 | *timeout = timespec64_sub(end_time, timeout64); |
a2e27255 ACM |
2722 | if (timeout->tv_sec < 0) { |
2723 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2724 | break; | |
2725 | } | |
2726 | ||
2727 | /* Timeout, return less than vlen datagrams */ | |
2728 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2729 | break; | |
2730 | } | |
2731 | ||
2732 | /* Out of band data, return right away */ | |
2733 | if (msg_sys.msg_flags & MSG_OOB) | |
2734 | break; | |
a78cb84c | 2735 | cond_resched(); |
a2e27255 ACM |
2736 | } |
2737 | ||
a2e27255 | 2738 | if (err == 0) |
34b88a68 ACM |
2739 | goto out_put; |
2740 | ||
2741 | if (datagrams == 0) { | |
2742 | datagrams = err; | |
2743 | goto out_put; | |
2744 | } | |
a2e27255 | 2745 | |
34b88a68 ACM |
2746 | /* |
2747 | * We may return less entries than requested (vlen) if the | |
2748 | * sock is non block and there aren't enough datagrams... | |
2749 | */ | |
2750 | if (err != -EAGAIN) { | |
a2e27255 | 2751 | /* |
34b88a68 ACM |
2752 | * ... or if recvmsg returns an error after we |
2753 | * received some datagrams, where we record the | |
2754 | * error to return on the next call or if the | |
2755 | * app asks about it using getsockopt(SO_ERROR). | |
a2e27255 | 2756 | */ |
34b88a68 | 2757 | sock->sk->sk_err = -err; |
a2e27255 | 2758 | } |
34b88a68 ACM |
2759 | out_put: |
2760 | fput_light(sock->file, fput_needed); | |
a2e27255 | 2761 | |
34b88a68 | 2762 | return datagrams; |
a2e27255 ACM |
2763 | } |
2764 | ||
e11d4284 AB |
2765 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2766 | unsigned int vlen, unsigned int flags, | |
2767 | struct __kernel_timespec __user *timeout, | |
2768 | struct old_timespec32 __user *timeout32) | |
a2e27255 ACM |
2769 | { |
2770 | int datagrams; | |
c2e6c856 | 2771 | struct timespec64 timeout_sys; |
a2e27255 | 2772 | |
e11d4284 AB |
2773 | if (timeout && get_timespec64(&timeout_sys, timeout)) |
2774 | return -EFAULT; | |
a2e27255 | 2775 | |
e11d4284 | 2776 | if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) |
a2e27255 ACM |
2777 | return -EFAULT; |
2778 | ||
e11d4284 AB |
2779 | if (!timeout && !timeout32) |
2780 | return do_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2781 | ||
2782 | datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
a2e27255 | 2783 | |
e11d4284 AB |
2784 | if (datagrams <= 0) |
2785 | return datagrams; | |
2786 | ||
2787 | if (timeout && put_timespec64(&timeout_sys, timeout)) | |
2788 | datagrams = -EFAULT; | |
2789 | ||
2790 | if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) | |
a2e27255 ACM |
2791 | datagrams = -EFAULT; |
2792 | ||
2793 | return datagrams; | |
2794 | } | |
2795 | ||
1255e269 DB |
2796 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2797 | unsigned int, vlen, unsigned int, flags, | |
c2e6c856 | 2798 | struct __kernel_timespec __user *, timeout) |
1255e269 | 2799 | { |
e11d4284 AB |
2800 | if (flags & MSG_CMSG_COMPAT) |
2801 | return -EINVAL; | |
2802 | ||
2803 | return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); | |
2804 | } | |
2805 | ||
2806 | #ifdef CONFIG_COMPAT_32BIT_TIME | |
2807 | SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, | |
2808 | unsigned int, vlen, unsigned int, flags, | |
2809 | struct old_timespec32 __user *, timeout) | |
2810 | { | |
2811 | if (flags & MSG_CMSG_COMPAT) | |
2812 | return -EINVAL; | |
2813 | ||
2814 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); | |
1255e269 | 2815 | } |
e11d4284 | 2816 | #endif |
1255e269 | 2817 | |
a2e27255 | 2818 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
1da177e4 LT |
2819 | /* Argument list sizes for sys_socketcall */ |
2820 | #define AL(x) ((x) * sizeof(unsigned long)) | |
228e548e | 2821 | static const unsigned char nargs[21] = { |
c6d409cf ED |
2822 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
2823 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2824 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
228e548e | 2825 | AL(4), AL(5), AL(4) |
89bddce5 SH |
2826 | }; |
2827 | ||
1da177e4 LT |
2828 | #undef AL |
2829 | ||
2830 | /* | |
89bddce5 | 2831 | * System call vectors. |
1da177e4 LT |
2832 | * |
2833 | * Argument checking cleaned up. Saved 20% in size. | |
2834 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 2835 | * it is set by the callees. |
1da177e4 LT |
2836 | */ |
2837 | ||
3e0fa65f | 2838 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
1da177e4 | 2839 | { |
2950fa9d | 2840 | unsigned long a[AUDITSC_ARGS]; |
89bddce5 | 2841 | unsigned long a0, a1; |
1da177e4 | 2842 | int err; |
47379052 | 2843 | unsigned int len; |
1da177e4 | 2844 | |
228e548e | 2845 | if (call < 1 || call > SYS_SENDMMSG) |
1da177e4 | 2846 | return -EINVAL; |
c8e8cd57 | 2847 | call = array_index_nospec(call, SYS_SENDMMSG + 1); |
1da177e4 | 2848 | |
47379052 AV |
2849 | len = nargs[call]; |
2850 | if (len > sizeof(a)) | |
2851 | return -EINVAL; | |
2852 | ||
1da177e4 | 2853 | /* copy_from_user should be SMP safe. */ |
47379052 | 2854 | if (copy_from_user(a, args, len)) |
1da177e4 | 2855 | return -EFAULT; |
3ec3b2fb | 2856 | |
2950fa9d CG |
2857 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
2858 | if (err) | |
2859 | return err; | |
3ec3b2fb | 2860 | |
89bddce5 SH |
2861 | a0 = a[0]; |
2862 | a1 = a[1]; | |
2863 | ||
2864 | switch (call) { | |
2865 | case SYS_SOCKET: | |
9d6a15c3 | 2866 | err = __sys_socket(a0, a1, a[2]); |
89bddce5 SH |
2867 | break; |
2868 | case SYS_BIND: | |
a87d35d8 | 2869 | err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
2870 | break; |
2871 | case SYS_CONNECT: | |
1387c2c2 | 2872 | err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
2873 | break; |
2874 | case SYS_LISTEN: | |
25e290ee | 2875 | err = __sys_listen(a0, a1); |
89bddce5 SH |
2876 | break; |
2877 | case SYS_ACCEPT: | |
4541e805 DB |
2878 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
2879 | (int __user *)a[2], 0); | |
89bddce5 SH |
2880 | break; |
2881 | case SYS_GETSOCKNAME: | |
2882 | err = | |
8882a107 DB |
2883 | __sys_getsockname(a0, (struct sockaddr __user *)a1, |
2884 | (int __user *)a[2]); | |
89bddce5 SH |
2885 | break; |
2886 | case SYS_GETPEERNAME: | |
2887 | err = | |
b21c8f83 DB |
2888 | __sys_getpeername(a0, (struct sockaddr __user *)a1, |
2889 | (int __user *)a[2]); | |
89bddce5 SH |
2890 | break; |
2891 | case SYS_SOCKETPAIR: | |
6debc8d8 | 2892 | err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
89bddce5 SH |
2893 | break; |
2894 | case SYS_SEND: | |
f3bf896b DB |
2895 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2896 | NULL, 0); | |
89bddce5 SH |
2897 | break; |
2898 | case SYS_SENDTO: | |
211b634b DB |
2899 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2900 | (struct sockaddr __user *)a[4], a[5]); | |
89bddce5 SH |
2901 | break; |
2902 | case SYS_RECV: | |
d27e9afc DB |
2903 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2904 | NULL, NULL); | |
89bddce5 SH |
2905 | break; |
2906 | case SYS_RECVFROM: | |
7a09e1eb DB |
2907 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2908 | (struct sockaddr __user *)a[4], | |
2909 | (int __user *)a[5]); | |
89bddce5 SH |
2910 | break; |
2911 | case SYS_SHUTDOWN: | |
005a1aea | 2912 | err = __sys_shutdown(a0, a1); |
89bddce5 SH |
2913 | break; |
2914 | case SYS_SETSOCKOPT: | |
cc36dca0 DB |
2915 | err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], |
2916 | a[4]); | |
89bddce5 SH |
2917 | break; |
2918 | case SYS_GETSOCKOPT: | |
2919 | err = | |
13a2d70e DB |
2920 | __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
2921 | (int __user *)a[4]); | |
89bddce5 SH |
2922 | break; |
2923 | case SYS_SENDMSG: | |
e1834a32 DB |
2924 | err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, |
2925 | a[2], true); | |
89bddce5 | 2926 | break; |
228e548e | 2927 | case SYS_SENDMMSG: |
e1834a32 DB |
2928 | err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], |
2929 | a[3], true); | |
228e548e | 2930 | break; |
89bddce5 | 2931 | case SYS_RECVMSG: |
e1834a32 DB |
2932 | err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, |
2933 | a[2], true); | |
89bddce5 | 2934 | break; |
a2e27255 | 2935 | case SYS_RECVMMSG: |
3ca47e95 | 2936 | if (IS_ENABLED(CONFIG_64BIT)) |
e11d4284 AB |
2937 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, |
2938 | a[2], a[3], | |
2939 | (struct __kernel_timespec __user *)a[4], | |
2940 | NULL); | |
2941 | else | |
2942 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, | |
2943 | a[2], a[3], NULL, | |
2944 | (struct old_timespec32 __user *)a[4]); | |
a2e27255 | 2945 | break; |
de11defe | 2946 | case SYS_ACCEPT4: |
4541e805 DB |
2947 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
2948 | (int __user *)a[2], a[3]); | |
aaca0bdc | 2949 | break; |
89bddce5 SH |
2950 | default: |
2951 | err = -EINVAL; | |
2952 | break; | |
1da177e4 LT |
2953 | } |
2954 | return err; | |
2955 | } | |
2956 | ||
89bddce5 | 2957 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 2958 | |
55737fda SH |
2959 | /** |
2960 | * sock_register - add a socket protocol handler | |
2961 | * @ops: description of protocol | |
2962 | * | |
1da177e4 LT |
2963 | * This function is called by a protocol handler that wants to |
2964 | * advertise its address family, and have it linked into the | |
e793c0f7 | 2965 | * socket interface. The value ops->family corresponds to the |
55737fda | 2966 | * socket system call protocol family. |
1da177e4 | 2967 | */ |
f0fd27d4 | 2968 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
2969 | { |
2970 | int err; | |
2971 | ||
2972 | if (ops->family >= NPROTO) { | |
3410f22e | 2973 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
1da177e4 LT |
2974 | return -ENOBUFS; |
2975 | } | |
55737fda SH |
2976 | |
2977 | spin_lock(&net_family_lock); | |
190683a9 ED |
2978 | if (rcu_dereference_protected(net_families[ops->family], |
2979 | lockdep_is_held(&net_family_lock))) | |
55737fda SH |
2980 | err = -EEXIST; |
2981 | else { | |
cf778b00 | 2982 | rcu_assign_pointer(net_families[ops->family], ops); |
1da177e4 LT |
2983 | err = 0; |
2984 | } | |
55737fda SH |
2985 | spin_unlock(&net_family_lock); |
2986 | ||
3410f22e | 2987 | pr_info("NET: Registered protocol family %d\n", ops->family); |
1da177e4 LT |
2988 | return err; |
2989 | } | |
c6d409cf | 2990 | EXPORT_SYMBOL(sock_register); |
1da177e4 | 2991 | |
55737fda SH |
2992 | /** |
2993 | * sock_unregister - remove a protocol handler | |
2994 | * @family: protocol family to remove | |
2995 | * | |
1da177e4 LT |
2996 | * This function is called by a protocol handler that wants to |
2997 | * remove its address family, and have it unlinked from the | |
55737fda SH |
2998 | * new socket creation. |
2999 | * | |
3000 | * If protocol handler is a module, then it can use module reference | |
3001 | * counts to protect against new references. If protocol handler is not | |
3002 | * a module then it needs to provide its own protection in | |
3003 | * the ops->create routine. | |
1da177e4 | 3004 | */ |
f0fd27d4 | 3005 | void sock_unregister(int family) |
1da177e4 | 3006 | { |
f0fd27d4 | 3007 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 3008 | |
55737fda | 3009 | spin_lock(&net_family_lock); |
a9b3cd7f | 3010 | RCU_INIT_POINTER(net_families[family], NULL); |
55737fda SH |
3011 | spin_unlock(&net_family_lock); |
3012 | ||
3013 | synchronize_rcu(); | |
3014 | ||
3410f22e | 3015 | pr_info("NET: Unregistered protocol family %d\n", family); |
1da177e4 | 3016 | } |
c6d409cf | 3017 | EXPORT_SYMBOL(sock_unregister); |
1da177e4 | 3018 | |
bf2ae2e4 XL |
3019 | bool sock_is_registered(int family) |
3020 | { | |
66b51b0a | 3021 | return family < NPROTO && rcu_access_pointer(net_families[family]); |
bf2ae2e4 XL |
3022 | } |
3023 | ||
77d76ea3 | 3024 | static int __init sock_init(void) |
1da177e4 | 3025 | { |
b3e19d92 | 3026 | int err; |
2ca794e5 EB |
3027 | /* |
3028 | * Initialize the network sysctl infrastructure. | |
3029 | */ | |
3030 | err = net_sysctl_init(); | |
3031 | if (err) | |
3032 | goto out; | |
b3e19d92 | 3033 | |
1da177e4 | 3034 | /* |
89bddce5 | 3035 | * Initialize skbuff SLAB cache |
1da177e4 LT |
3036 | */ |
3037 | skb_init(); | |
1da177e4 LT |
3038 | |
3039 | /* | |
89bddce5 | 3040 | * Initialize the protocols module. |
1da177e4 LT |
3041 | */ |
3042 | ||
3043 | init_inodecache(); | |
b3e19d92 NP |
3044 | |
3045 | err = register_filesystem(&sock_fs_type); | |
3046 | if (err) | |
47260ba9 | 3047 | goto out; |
1da177e4 | 3048 | sock_mnt = kern_mount(&sock_fs_type); |
b3e19d92 NP |
3049 | if (IS_ERR(sock_mnt)) { |
3050 | err = PTR_ERR(sock_mnt); | |
3051 | goto out_mount; | |
3052 | } | |
77d76ea3 AK |
3053 | |
3054 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
3055 | */ |
3056 | ||
3057 | #ifdef CONFIG_NETFILTER | |
6d11cfdb PNA |
3058 | err = netfilter_init(); |
3059 | if (err) | |
3060 | goto out; | |
1da177e4 | 3061 | #endif |
cbeb321a | 3062 | |
408eccce | 3063 | ptp_classifier_init(); |
c1f19b51 | 3064 | |
b3e19d92 NP |
3065 | out: |
3066 | return err; | |
3067 | ||
3068 | out_mount: | |
3069 | unregister_filesystem(&sock_fs_type); | |
b3e19d92 | 3070 | goto out; |
1da177e4 LT |
3071 | } |
3072 | ||
77d76ea3 AK |
3073 | core_initcall(sock_init); /* early initcall */ |
3074 | ||
1da177e4 LT |
3075 | #ifdef CONFIG_PROC_FS |
3076 | void socket_seq_show(struct seq_file *seq) | |
3077 | { | |
648845ab TZ |
3078 | seq_printf(seq, "sockets: used %d\n", |
3079 | sock_inuse_get(seq->private)); | |
1da177e4 | 3080 | } |
89bddce5 | 3081 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 3082 | |
89bbfc95 | 3083 | #ifdef CONFIG_COMPAT |
36fd633e | 3084 | static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) |
7a229387 | 3085 | { |
6b96018b | 3086 | struct compat_ifconf ifc32; |
7a229387 | 3087 | struct ifconf ifc; |
7a229387 AB |
3088 | int err; |
3089 | ||
6b96018b | 3090 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) |
7a229387 AB |
3091 | return -EFAULT; |
3092 | ||
36fd633e AV |
3093 | ifc.ifc_len = ifc32.ifc_len; |
3094 | ifc.ifc_req = compat_ptr(ifc32.ifcbuf); | |
7a229387 | 3095 | |
36fd633e AV |
3096 | rtnl_lock(); |
3097 | err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); | |
3098 | rtnl_unlock(); | |
7a229387 AB |
3099 | if (err) |
3100 | return err; | |
3101 | ||
36fd633e | 3102 | ifc32.ifc_len = ifc.ifc_len; |
6b96018b | 3103 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) |
7a229387 AB |
3104 | return -EFAULT; |
3105 | ||
3106 | return 0; | |
3107 | } | |
3108 | ||
6b96018b | 3109 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) |
7a229387 | 3110 | { |
3a7da39d BH |
3111 | struct compat_ethtool_rxnfc __user *compat_rxnfc; |
3112 | bool convert_in = false, convert_out = false; | |
44c02a2c AV |
3113 | size_t buf_size = 0; |
3114 | struct ethtool_rxnfc __user *rxnfc = NULL; | |
3115 | struct ifreq ifr; | |
3a7da39d BH |
3116 | u32 rule_cnt = 0, actual_rule_cnt; |
3117 | u32 ethcmd; | |
7a229387 | 3118 | u32 data; |
3a7da39d | 3119 | int ret; |
7a229387 | 3120 | |
3a7da39d BH |
3121 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) |
3122 | return -EFAULT; | |
7a229387 | 3123 | |
3a7da39d BH |
3124 | compat_rxnfc = compat_ptr(data); |
3125 | ||
3126 | if (get_user(ethcmd, &compat_rxnfc->cmd)) | |
7a229387 AB |
3127 | return -EFAULT; |
3128 | ||
3a7da39d BH |
3129 | /* Most ethtool structures are defined without padding. |
3130 | * Unfortunately struct ethtool_rxnfc is an exception. | |
3131 | */ | |
3132 | switch (ethcmd) { | |
3133 | default: | |
3134 | break; | |
3135 | case ETHTOOL_GRXCLSRLALL: | |
3136 | /* Buffer size is variable */ | |
3137 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) | |
3138 | return -EFAULT; | |
3139 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) | |
3140 | return -ENOMEM; | |
3141 | buf_size += rule_cnt * sizeof(u32); | |
7c7ab580 | 3142 | fallthrough; |
3a7da39d BH |
3143 | case ETHTOOL_GRXRINGS: |
3144 | case ETHTOOL_GRXCLSRLCNT: | |
3145 | case ETHTOOL_GRXCLSRULE: | |
55664f32 | 3146 | case ETHTOOL_SRXCLSRLINS: |
3a7da39d | 3147 | convert_out = true; |
7c7ab580 | 3148 | fallthrough; |
3a7da39d | 3149 | case ETHTOOL_SRXCLSRLDEL: |
3a7da39d BH |
3150 | buf_size += sizeof(struct ethtool_rxnfc); |
3151 | convert_in = true; | |
44c02a2c | 3152 | rxnfc = compat_alloc_user_space(buf_size); |
3a7da39d BH |
3153 | break; |
3154 | } | |
3155 | ||
44c02a2c | 3156 | if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) |
7a229387 AB |
3157 | return -EFAULT; |
3158 | ||
44c02a2c | 3159 | ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; |
7a229387 | 3160 | |
3a7da39d | 3161 | if (convert_in) { |
127fe533 | 3162 | /* We expect there to be holes between fs.m_ext and |
3a7da39d BH |
3163 | * fs.ring_cookie and at the end of fs, but nowhere else. |
3164 | */ | |
127fe533 AD |
3165 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + |
3166 | sizeof(compat_rxnfc->fs.m_ext) != | |
3167 | offsetof(struct ethtool_rxnfc, fs.m_ext) + | |
3168 | sizeof(rxnfc->fs.m_ext)); | |
3a7da39d BH |
3169 | BUILD_BUG_ON( |
3170 | offsetof(struct compat_ethtool_rxnfc, fs.location) - | |
3171 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != | |
3172 | offsetof(struct ethtool_rxnfc, fs.location) - | |
3173 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); | |
3174 | ||
3175 | if (copy_in_user(rxnfc, compat_rxnfc, | |
954b1244 SH |
3176 | (void __user *)(&rxnfc->fs.m_ext + 1) - |
3177 | (void __user *)rxnfc) || | |
3a7da39d BH |
3178 | copy_in_user(&rxnfc->fs.ring_cookie, |
3179 | &compat_rxnfc->fs.ring_cookie, | |
954b1244 | 3180 | (void __user *)(&rxnfc->fs.location + 1) - |
b6168562 WW |
3181 | (void __user *)&rxnfc->fs.ring_cookie)) |
3182 | return -EFAULT; | |
3183 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
3184 | if (put_user(rule_cnt, &rxnfc->rule_cnt)) | |
3185 | return -EFAULT; | |
3186 | } else if (copy_in_user(&rxnfc->rule_cnt, | |
3187 | &compat_rxnfc->rule_cnt, | |
3188 | sizeof(rxnfc->rule_cnt))) | |
3a7da39d BH |
3189 | return -EFAULT; |
3190 | } | |
3191 | ||
44c02a2c | 3192 | ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); |
3a7da39d BH |
3193 | if (ret) |
3194 | return ret; | |
3195 | ||
3196 | if (convert_out) { | |
3197 | if (copy_in_user(compat_rxnfc, rxnfc, | |
954b1244 SH |
3198 | (const void __user *)(&rxnfc->fs.m_ext + 1) - |
3199 | (const void __user *)rxnfc) || | |
3a7da39d BH |
3200 | copy_in_user(&compat_rxnfc->fs.ring_cookie, |
3201 | &rxnfc->fs.ring_cookie, | |
954b1244 SH |
3202 | (const void __user *)(&rxnfc->fs.location + 1) - |
3203 | (const void __user *)&rxnfc->fs.ring_cookie) || | |
3a7da39d BH |
3204 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, |
3205 | sizeof(rxnfc->rule_cnt))) | |
3206 | return -EFAULT; | |
3207 | ||
3208 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { | |
3209 | /* As an optimisation, we only copy the actual | |
3210 | * number of rules that the underlying | |
3211 | * function returned. Since Mallory might | |
3212 | * change the rule count in user memory, we | |
3213 | * check that it is less than the rule count | |
3214 | * originally given (as the user buffer size), | |
3215 | * which has been range-checked. | |
3216 | */ | |
3217 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) | |
3218 | return -EFAULT; | |
3219 | if (actual_rule_cnt < rule_cnt) | |
3220 | rule_cnt = actual_rule_cnt; | |
3221 | if (copy_in_user(&compat_rxnfc->rule_locs[0], | |
3222 | &rxnfc->rule_locs[0], | |
3223 | rule_cnt * sizeof(u32))) | |
3224 | return -EFAULT; | |
3225 | } | |
3226 | } | |
3227 | ||
3228 | return 0; | |
7a229387 AB |
3229 | } |
3230 | ||
7a50a240 AB |
3231 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
3232 | { | |
7a50a240 | 3233 | compat_uptr_t uptr32; |
44c02a2c AV |
3234 | struct ifreq ifr; |
3235 | void __user *saved; | |
3236 | int err; | |
7a50a240 | 3237 | |
44c02a2c | 3238 | if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) |
7a50a240 AB |
3239 | return -EFAULT; |
3240 | ||
3241 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
3242 | return -EFAULT; | |
3243 | ||
44c02a2c AV |
3244 | saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; |
3245 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); | |
7a229387 | 3246 | |
44c02a2c AV |
3247 | err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); |
3248 | if (!err) { | |
3249 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; | |
3250 | if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) | |
3251 | err = -EFAULT; | |
ccbd6a5a | 3252 | } |
44c02a2c | 3253 | return err; |
7a229387 AB |
3254 | } |
3255 | ||
590d4693 BH |
3256 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ |
3257 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
6b96018b | 3258 | struct compat_ifreq __user *u_ifreq32) |
7a229387 | 3259 | { |
44c02a2c | 3260 | struct ifreq ifreq; |
7a229387 AB |
3261 | u32 data32; |
3262 | ||
44c02a2c | 3263 | if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) |
7a229387 | 3264 | return -EFAULT; |
44c02a2c | 3265 | if (get_user(data32, &u_ifreq32->ifr_data)) |
7a229387 | 3266 | return -EFAULT; |
44c02a2c | 3267 | ifreq.ifr_data = compat_ptr(data32); |
7a229387 | 3268 | |
44c02a2c | 3269 | return dev_ioctl(net, cmd, &ifreq, NULL); |
7a229387 AB |
3270 | } |
3271 | ||
37ac39bd JB |
3272 | static int compat_ifreq_ioctl(struct net *net, struct socket *sock, |
3273 | unsigned int cmd, | |
3274 | struct compat_ifreq __user *uifr32) | |
3275 | { | |
3276 | struct ifreq __user *uifr; | |
3277 | int err; | |
3278 | ||
3279 | /* Handle the fact that while struct ifreq has the same *layout* on | |
3280 | * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, | |
3281 | * which are handled elsewhere, it still has different *size* due to | |
3282 | * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, | |
3283 | * resulting in struct ifreq being 32 and 40 bytes respectively). | |
3284 | * As a result, if the struct happens to be at the end of a page and | |
3285 | * the next page isn't readable/writable, we get a fault. To prevent | |
3286 | * that, copy back and forth to the full size. | |
3287 | */ | |
3288 | ||
3289 | uifr = compat_alloc_user_space(sizeof(*uifr)); | |
3290 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) | |
3291 | return -EFAULT; | |
3292 | ||
3293 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); | |
3294 | ||
3295 | if (!err) { | |
3296 | switch (cmd) { | |
3297 | case SIOCGIFFLAGS: | |
3298 | case SIOCGIFMETRIC: | |
3299 | case SIOCGIFMTU: | |
3300 | case SIOCGIFMEM: | |
3301 | case SIOCGIFHWADDR: | |
3302 | case SIOCGIFINDEX: | |
3303 | case SIOCGIFADDR: | |
3304 | case SIOCGIFBRDADDR: | |
3305 | case SIOCGIFDSTADDR: | |
3306 | case SIOCGIFNETMASK: | |
3307 | case SIOCGIFPFLAGS: | |
3308 | case SIOCGIFTXQLEN: | |
3309 | case SIOCGMIIPHY: | |
3310 | case SIOCGMIIREG: | |
c6c9fee3 | 3311 | case SIOCGIFNAME: |
37ac39bd JB |
3312 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) |
3313 | err = -EFAULT; | |
3314 | break; | |
3315 | } | |
3316 | } | |
3317 | return err; | |
3318 | } | |
3319 | ||
a2116ed2 AB |
3320 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, |
3321 | struct compat_ifreq __user *uifr32) | |
3322 | { | |
3323 | struct ifreq ifr; | |
3324 | struct compat_ifmap __user *uifmap32; | |
a2116ed2 AB |
3325 | int err; |
3326 | ||
3327 | uifmap32 = &uifr32->ifr_ifru.ifru_map; | |
3328 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); | |
3ddc5b46 MD |
3329 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
3330 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
3331 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
3332 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); | |
3333 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); | |
3334 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); | |
a2116ed2 AB |
3335 | if (err) |
3336 | return -EFAULT; | |
3337 | ||
44c02a2c | 3338 | err = dev_ioctl(net, cmd, &ifr, NULL); |
a2116ed2 AB |
3339 | |
3340 | if (cmd == SIOCGIFMAP && !err) { | |
3341 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); | |
3ddc5b46 MD |
3342 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
3343 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); | |
3344 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); | |
3345 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); | |
3346 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); | |
3347 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); | |
a2116ed2 AB |
3348 | if (err) |
3349 | err = -EFAULT; | |
3350 | } | |
3351 | return err; | |
3352 | } | |
3353 | ||
7a229387 AB |
3354 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE |
3355 | * for some operations; this forces use of the newer bridge-utils that | |
25985edc | 3356 | * use compatible ioctls |
7a229387 | 3357 | */ |
6b96018b | 3358 | static int old_bridge_ioctl(compat_ulong_t __user *argp) |
7a229387 | 3359 | { |
6b96018b | 3360 | compat_ulong_t tmp; |
7a229387 | 3361 | |
6b96018b | 3362 | if (get_user(tmp, argp)) |
7a229387 AB |
3363 | return -EFAULT; |
3364 | if (tmp == BRCTL_GET_VERSION) | |
3365 | return BRCTL_VERSION + 1; | |
3366 | return -EINVAL; | |
3367 | } | |
3368 | ||
6b96018b AB |
3369 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
3370 | unsigned int cmd, unsigned long arg) | |
3371 | { | |
3372 | void __user *argp = compat_ptr(arg); | |
3373 | struct sock *sk = sock->sk; | |
3374 | struct net *net = sock_net(sk); | |
7a229387 | 3375 | |
6b96018b | 3376 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
590d4693 | 3377 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3378 | |
3379 | switch (cmd) { | |
3380 | case SIOCSIFBR: | |
3381 | case SIOCGIFBR: | |
3382 | return old_bridge_ioctl(argp); | |
6b96018b | 3383 | case SIOCGIFCONF: |
36fd633e | 3384 | return compat_dev_ifconf(net, argp); |
6b96018b AB |
3385 | case SIOCETHTOOL: |
3386 | return ethtool_ioctl(net, argp); | |
7a50a240 AB |
3387 | case SIOCWANDEV: |
3388 | return compat_siocwandev(net, argp); | |
a2116ed2 AB |
3389 | case SIOCGIFMAP: |
3390 | case SIOCSIFMAP: | |
3391 | return compat_sioc_ifmap(net, cmd, argp); | |
0768e170 AB |
3392 | case SIOCGSTAMP_OLD: |
3393 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
3394 | if (!sock->ops->gettstamp) |
3395 | return -ENOIOCTLCMD; | |
0768e170 | 3396 | return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, |
c7cbdbf2 AB |
3397 | !COMPAT_USE_64BIT_TIME); |
3398 | ||
590d4693 BH |
3399 | case SIOCBONDSLAVEINFOQUERY: |
3400 | case SIOCBONDINFOQUERY: | |
a2116ed2 | 3401 | case SIOCSHWTSTAMP: |
fd468c74 | 3402 | case SIOCGHWTSTAMP: |
590d4693 | 3403 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3404 | |
3405 | case FIOSETOWN: | |
3406 | case SIOCSPGRP: | |
3407 | case FIOGETOWN: | |
3408 | case SIOCGPGRP: | |
3409 | case SIOCBRADDBR: | |
3410 | case SIOCBRDELBR: | |
3411 | case SIOCGIFVLAN: | |
3412 | case SIOCSIFVLAN: | |
c62cce2c | 3413 | case SIOCGSKNS: |
0768e170 AB |
3414 | case SIOCGSTAMP_NEW: |
3415 | case SIOCGSTAMPNS_NEW: | |
6b96018b AB |
3416 | return sock_ioctl(file, cmd, arg); |
3417 | ||
3418 | case SIOCGIFFLAGS: | |
3419 | case SIOCSIFFLAGS: | |
3420 | case SIOCGIFMETRIC: | |
3421 | case SIOCSIFMETRIC: | |
3422 | case SIOCGIFMTU: | |
3423 | case SIOCSIFMTU: | |
3424 | case SIOCGIFMEM: | |
3425 | case SIOCSIFMEM: | |
3426 | case SIOCGIFHWADDR: | |
3427 | case SIOCSIFHWADDR: | |
3428 | case SIOCADDMULTI: | |
3429 | case SIOCDELMULTI: | |
3430 | case SIOCGIFINDEX: | |
6b96018b AB |
3431 | case SIOCGIFADDR: |
3432 | case SIOCSIFADDR: | |
3433 | case SIOCSIFHWBROADCAST: | |
6b96018b | 3434 | case SIOCDIFADDR: |
6b96018b AB |
3435 | case SIOCGIFBRDADDR: |
3436 | case SIOCSIFBRDADDR: | |
3437 | case SIOCGIFDSTADDR: | |
3438 | case SIOCSIFDSTADDR: | |
3439 | case SIOCGIFNETMASK: | |
3440 | case SIOCSIFNETMASK: | |
3441 | case SIOCSIFPFLAGS: | |
3442 | case SIOCGIFPFLAGS: | |
3443 | case SIOCGIFTXQLEN: | |
3444 | case SIOCSIFTXQLEN: | |
3445 | case SIOCBRADDIF: | |
3446 | case SIOCBRDELIF: | |
c6c9fee3 | 3447 | case SIOCGIFNAME: |
9177efd3 AB |
3448 | case SIOCSIFNAME: |
3449 | case SIOCGMIIPHY: | |
3450 | case SIOCGMIIREG: | |
3451 | case SIOCSMIIREG: | |
f92d4fc9 AV |
3452 | case SIOCBONDENSLAVE: |
3453 | case SIOCBONDRELEASE: | |
3454 | case SIOCBONDSETHWADDR: | |
3455 | case SIOCBONDCHANGEACTIVE: | |
37ac39bd JB |
3456 | return compat_ifreq_ioctl(net, sock, cmd, argp); |
3457 | ||
6b96018b AB |
3458 | case SIOCSARP: |
3459 | case SIOCGARP: | |
3460 | case SIOCDARP: | |
c7dc504e | 3461 | case SIOCOUTQ: |
9d7bf41f | 3462 | case SIOCOUTQNSD: |
6b96018b | 3463 | case SIOCATMARK: |
63ff03ab | 3464 | return sock_do_ioctl(net, sock, cmd, arg); |
9177efd3 AB |
3465 | } |
3466 | ||
6b96018b AB |
3467 | return -ENOIOCTLCMD; |
3468 | } | |
7a229387 | 3469 | |
95c96174 | 3470 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, |
89bddce5 | 3471 | unsigned long arg) |
89bbfc95 SP |
3472 | { |
3473 | struct socket *sock = file->private_data; | |
3474 | int ret = -ENOIOCTLCMD; | |
87de87d5 DM |
3475 | struct sock *sk; |
3476 | struct net *net; | |
3477 | ||
3478 | sk = sock->sk; | |
3479 | net = sock_net(sk); | |
89bbfc95 SP |
3480 | |
3481 | if (sock->ops->compat_ioctl) | |
3482 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3483 | ||
87de87d5 DM |
3484 | if (ret == -ENOIOCTLCMD && |
3485 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3486 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3487 | ||
6b96018b AB |
3488 | if (ret == -ENOIOCTLCMD) |
3489 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3490 | ||
89bbfc95 SP |
3491 | return ret; |
3492 | } | |
3493 | #endif | |
3494 | ||
8a3c245c PT |
3495 | /** |
3496 | * kernel_bind - bind an address to a socket (kernel space) | |
3497 | * @sock: socket | |
3498 | * @addr: address | |
3499 | * @addrlen: length of address | |
3500 | * | |
3501 | * Returns 0 or an error. | |
3502 | */ | |
3503 | ||
ac5a488e SS |
3504 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
3505 | { | |
3506 | return sock->ops->bind(sock, addr, addrlen); | |
3507 | } | |
c6d409cf | 3508 | EXPORT_SYMBOL(kernel_bind); |
ac5a488e | 3509 | |
8a3c245c PT |
3510 | /** |
3511 | * kernel_listen - move socket to listening state (kernel space) | |
3512 | * @sock: socket | |
3513 | * @backlog: pending connections queue size | |
3514 | * | |
3515 | * Returns 0 or an error. | |
3516 | */ | |
3517 | ||
ac5a488e SS |
3518 | int kernel_listen(struct socket *sock, int backlog) |
3519 | { | |
3520 | return sock->ops->listen(sock, backlog); | |
3521 | } | |
c6d409cf | 3522 | EXPORT_SYMBOL(kernel_listen); |
ac5a488e | 3523 | |
8a3c245c PT |
3524 | /** |
3525 | * kernel_accept - accept a connection (kernel space) | |
3526 | * @sock: listening socket | |
3527 | * @newsock: new connected socket | |
3528 | * @flags: flags | |
3529 | * | |
3530 | * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. | |
3531 | * If it fails, @newsock is guaranteed to be %NULL. | |
3532 | * Returns 0 or an error. | |
3533 | */ | |
3534 | ||
ac5a488e SS |
3535 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
3536 | { | |
3537 | struct sock *sk = sock->sk; | |
3538 | int err; | |
3539 | ||
3540 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3541 | newsock); | |
3542 | if (err < 0) | |
3543 | goto done; | |
3544 | ||
cdfbabfb | 3545 | err = sock->ops->accept(sock, *newsock, flags, true); |
ac5a488e SS |
3546 | if (err < 0) { |
3547 | sock_release(*newsock); | |
fa8705b0 | 3548 | *newsock = NULL; |
ac5a488e SS |
3549 | goto done; |
3550 | } | |
3551 | ||
3552 | (*newsock)->ops = sock->ops; | |
1b08534e | 3553 | __module_get((*newsock)->ops->owner); |
ac5a488e SS |
3554 | |
3555 | done: | |
3556 | return err; | |
3557 | } | |
c6d409cf | 3558 | EXPORT_SYMBOL(kernel_accept); |
ac5a488e | 3559 | |
8a3c245c PT |
3560 | /** |
3561 | * kernel_connect - connect a socket (kernel space) | |
3562 | * @sock: socket | |
3563 | * @addr: address | |
3564 | * @addrlen: address length | |
3565 | * @flags: flags (O_NONBLOCK, ...) | |
3566 | * | |
3567 | * For datagram sockets, @addr is the addres to which datagrams are sent | |
3568 | * by default, and the only address from which datagrams are received. | |
3569 | * For stream sockets, attempts to connect to @addr. | |
3570 | * Returns 0 or an error code. | |
3571 | */ | |
3572 | ||
ac5a488e | 3573 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
4768fbcb | 3574 | int flags) |
ac5a488e SS |
3575 | { |
3576 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3577 | } | |
c6d409cf | 3578 | EXPORT_SYMBOL(kernel_connect); |
ac5a488e | 3579 | |
8a3c245c PT |
3580 | /** |
3581 | * kernel_getsockname - get the address which the socket is bound (kernel space) | |
3582 | * @sock: socket | |
3583 | * @addr: address holder | |
3584 | * | |
3585 | * Fills the @addr pointer with the address which the socket is bound. | |
3586 | * Returns 0 or an error code. | |
3587 | */ | |
3588 | ||
9b2c45d4 | 3589 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3590 | { |
9b2c45d4 | 3591 | return sock->ops->getname(sock, addr, 0); |
ac5a488e | 3592 | } |
c6d409cf | 3593 | EXPORT_SYMBOL(kernel_getsockname); |
ac5a488e | 3594 | |
8a3c245c | 3595 | /** |
645f0897 | 3596 | * kernel_getpeername - get the address which the socket is connected (kernel space) |
8a3c245c PT |
3597 | * @sock: socket |
3598 | * @addr: address holder | |
3599 | * | |
3600 | * Fills the @addr pointer with the address which the socket is connected. | |
3601 | * Returns 0 or an error code. | |
3602 | */ | |
3603 | ||
9b2c45d4 | 3604 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3605 | { |
9b2c45d4 | 3606 | return sock->ops->getname(sock, addr, 1); |
ac5a488e | 3607 | } |
c6d409cf | 3608 | EXPORT_SYMBOL(kernel_getpeername); |
ac5a488e | 3609 | |
8a3c245c PT |
3610 | /** |
3611 | * kernel_sendpage - send a &page through a socket (kernel space) | |
3612 | * @sock: socket | |
3613 | * @page: page | |
3614 | * @offset: page offset | |
3615 | * @size: total size in bytes | |
3616 | * @flags: flags (MSG_DONTWAIT, ...) | |
3617 | * | |
3618 | * Returns the total amount sent in bytes or an error. | |
3619 | */ | |
3620 | ||
ac5a488e SS |
3621 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
3622 | size_t size, int flags) | |
3623 | { | |
7b62d31d CL |
3624 | if (sock->ops->sendpage) { |
3625 | /* Warn in case the improper page to zero-copy send */ | |
3626 | WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send"); | |
ac5a488e | 3627 | return sock->ops->sendpage(sock, page, offset, size, flags); |
7b62d31d | 3628 | } |
ac5a488e SS |
3629 | return sock_no_sendpage(sock, page, offset, size, flags); |
3630 | } | |
c6d409cf | 3631 | EXPORT_SYMBOL(kernel_sendpage); |
ac5a488e | 3632 | |
8a3c245c PT |
3633 | /** |
3634 | * kernel_sendpage_locked - send a &page through the locked sock (kernel space) | |
3635 | * @sk: sock | |
3636 | * @page: page | |
3637 | * @offset: page offset | |
3638 | * @size: total size in bytes | |
3639 | * @flags: flags (MSG_DONTWAIT, ...) | |
3640 | * | |
3641 | * Returns the total amount sent in bytes or an error. | |
3642 | * Caller must hold @sk. | |
3643 | */ | |
3644 | ||
306b13eb TH |
3645 | int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, |
3646 | size_t size, int flags) | |
3647 | { | |
3648 | struct socket *sock = sk->sk_socket; | |
3649 | ||
3650 | if (sock->ops->sendpage_locked) | |
3651 | return sock->ops->sendpage_locked(sk, page, offset, size, | |
3652 | flags); | |
3653 | ||
3654 | return sock_no_sendpage_locked(sk, page, offset, size, flags); | |
3655 | } | |
3656 | EXPORT_SYMBOL(kernel_sendpage_locked); | |
3657 | ||
8a3c245c | 3658 | /** |
645f0897 | 3659 | * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space) |
8a3c245c PT |
3660 | * @sock: socket |
3661 | * @how: connection part | |
3662 | * | |
3663 | * Returns 0 or an error. | |
3664 | */ | |
3665 | ||
91cf45f0 TM |
3666 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
3667 | { | |
3668 | return sock->ops->shutdown(sock, how); | |
3669 | } | |
91cf45f0 | 3670 | EXPORT_SYMBOL(kernel_sock_shutdown); |
113c3075 | 3671 | |
8a3c245c PT |
3672 | /** |
3673 | * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket | |
3674 | * @sk: socket | |
3675 | * | |
3676 | * This routine returns the IP overhead imposed by a socket i.e. | |
3677 | * the length of the underlying IP header, depending on whether | |
3678 | * this is an IPv4 or IPv6 socket and the length from IP options turned | |
3679 | * on at the socket. Assumes that the caller has a lock on the socket. | |
113c3075 | 3680 | */ |
8a3c245c | 3681 | |
113c3075 P |
3682 | u32 kernel_sock_ip_overhead(struct sock *sk) |
3683 | { | |
3684 | struct inet_sock *inet; | |
3685 | struct ip_options_rcu *opt; | |
3686 | u32 overhead = 0; | |
113c3075 P |
3687 | #if IS_ENABLED(CONFIG_IPV6) |
3688 | struct ipv6_pinfo *np; | |
3689 | struct ipv6_txoptions *optv6 = NULL; | |
3690 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3691 | ||
3692 | if (!sk) | |
3693 | return overhead; | |
3694 | ||
113c3075 P |
3695 | switch (sk->sk_family) { |
3696 | case AF_INET: | |
3697 | inet = inet_sk(sk); | |
3698 | overhead += sizeof(struct iphdr); | |
3699 | opt = rcu_dereference_protected(inet->inet_opt, | |
614d79c0 | 3700 | sock_owned_by_user(sk)); |
113c3075 P |
3701 | if (opt) |
3702 | overhead += opt->opt.optlen; | |
3703 | return overhead; | |
3704 | #if IS_ENABLED(CONFIG_IPV6) | |
3705 | case AF_INET6: | |
3706 | np = inet6_sk(sk); | |
3707 | overhead += sizeof(struct ipv6hdr); | |
3708 | if (np) | |
3709 | optv6 = rcu_dereference_protected(np->opt, | |
614d79c0 | 3710 | sock_owned_by_user(sk)); |
113c3075 P |
3711 | if (optv6) |
3712 | overhead += (optv6->opt_flen + optv6->opt_nflen); | |
3713 | return overhead; | |
3714 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3715 | default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ | |
3716 | return overhead; | |
3717 | } | |
3718 | } | |
3719 | EXPORT_SYMBOL(kernel_sock_ip_overhead); |