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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> |
d7c08826 | 107 | #include <linux/ptp_clock_kernel.h> |
06021292 | 108 | |
e0d1095a | 109 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 ET |
110 | unsigned int sysctl_net_busy_read __read_mostly; |
111 | unsigned int sysctl_net_busy_poll __read_mostly; | |
06021292 | 112 | #endif |
6b96018b | 113 | |
8ae5e030 AV |
114 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); |
115 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); | |
89bddce5 | 116 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
1da177e4 LT |
117 | |
118 | static int sock_close(struct inode *inode, struct file *file); | |
a11e1d43 LT |
119 | static __poll_t sock_poll(struct file *file, |
120 | struct poll_table_struct *wait); | |
89bddce5 | 121 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
89bbfc95 SP |
122 | #ifdef CONFIG_COMPAT |
123 | static long compat_sock_ioctl(struct file *file, | |
89bddce5 | 124 | unsigned int cmd, unsigned long arg); |
89bbfc95 | 125 | #endif |
1da177e4 | 126 | static int sock_fasync(int fd, struct file *filp, int on); |
1da177e4 LT |
127 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
128 | int offset, size_t size, loff_t *ppos, int more); | |
9c55e01c | 129 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 130 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c | 131 | unsigned int flags); |
542d3065 AB |
132 | |
133 | #ifdef CONFIG_PROC_FS | |
134 | static void sock_show_fdinfo(struct seq_file *m, struct file *f) | |
135 | { | |
136 | struct socket *sock = f->private_data; | |
137 | ||
138 | if (sock->ops->show_fdinfo) | |
139 | sock->ops->show_fdinfo(m, sock); | |
140 | } | |
141 | #else | |
142 | #define sock_show_fdinfo NULL | |
143 | #endif | |
1da177e4 | 144 | |
1da177e4 LT |
145 | /* |
146 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
147 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
148 | */ | |
149 | ||
da7071d7 | 150 | static const struct file_operations socket_file_ops = { |
1da177e4 LT |
151 | .owner = THIS_MODULE, |
152 | .llseek = no_llseek, | |
8ae5e030 AV |
153 | .read_iter = sock_read_iter, |
154 | .write_iter = sock_write_iter, | |
1da177e4 LT |
155 | .poll = sock_poll, |
156 | .unlocked_ioctl = sock_ioctl, | |
89bbfc95 SP |
157 | #ifdef CONFIG_COMPAT |
158 | .compat_ioctl = compat_sock_ioctl, | |
159 | #endif | |
1da177e4 | 160 | .mmap = sock_mmap, |
1da177e4 LT |
161 | .release = sock_close, |
162 | .fasync = sock_fasync, | |
5274f052 JA |
163 | .sendpage = sock_sendpage, |
164 | .splice_write = generic_splice_sendpage, | |
9c55e01c | 165 | .splice_read = sock_splice_read, |
b4653342 | 166 | .show_fdinfo = sock_show_fdinfo, |
1da177e4 LT |
167 | }; |
168 | ||
fe0bdbde YD |
169 | static const char * const pf_family_names[] = { |
170 | [PF_UNSPEC] = "PF_UNSPEC", | |
171 | [PF_UNIX] = "PF_UNIX/PF_LOCAL", | |
172 | [PF_INET] = "PF_INET", | |
173 | [PF_AX25] = "PF_AX25", | |
174 | [PF_IPX] = "PF_IPX", | |
175 | [PF_APPLETALK] = "PF_APPLETALK", | |
176 | [PF_NETROM] = "PF_NETROM", | |
177 | [PF_BRIDGE] = "PF_BRIDGE", | |
178 | [PF_ATMPVC] = "PF_ATMPVC", | |
179 | [PF_X25] = "PF_X25", | |
180 | [PF_INET6] = "PF_INET6", | |
181 | [PF_ROSE] = "PF_ROSE", | |
182 | [PF_DECnet] = "PF_DECnet", | |
183 | [PF_NETBEUI] = "PF_NETBEUI", | |
184 | [PF_SECURITY] = "PF_SECURITY", | |
185 | [PF_KEY] = "PF_KEY", | |
186 | [PF_NETLINK] = "PF_NETLINK/PF_ROUTE", | |
187 | [PF_PACKET] = "PF_PACKET", | |
188 | [PF_ASH] = "PF_ASH", | |
189 | [PF_ECONET] = "PF_ECONET", | |
190 | [PF_ATMSVC] = "PF_ATMSVC", | |
191 | [PF_RDS] = "PF_RDS", | |
192 | [PF_SNA] = "PF_SNA", | |
193 | [PF_IRDA] = "PF_IRDA", | |
194 | [PF_PPPOX] = "PF_PPPOX", | |
195 | [PF_WANPIPE] = "PF_WANPIPE", | |
196 | [PF_LLC] = "PF_LLC", | |
197 | [PF_IB] = "PF_IB", | |
198 | [PF_MPLS] = "PF_MPLS", | |
199 | [PF_CAN] = "PF_CAN", | |
200 | [PF_TIPC] = "PF_TIPC", | |
201 | [PF_BLUETOOTH] = "PF_BLUETOOTH", | |
202 | [PF_IUCV] = "PF_IUCV", | |
203 | [PF_RXRPC] = "PF_RXRPC", | |
204 | [PF_ISDN] = "PF_ISDN", | |
205 | [PF_PHONET] = "PF_PHONET", | |
206 | [PF_IEEE802154] = "PF_IEEE802154", | |
207 | [PF_CAIF] = "PF_CAIF", | |
208 | [PF_ALG] = "PF_ALG", | |
209 | [PF_NFC] = "PF_NFC", | |
210 | [PF_VSOCK] = "PF_VSOCK", | |
211 | [PF_KCM] = "PF_KCM", | |
212 | [PF_QIPCRTR] = "PF_QIPCRTR", | |
213 | [PF_SMC] = "PF_SMC", | |
214 | [PF_XDP] = "PF_XDP", | |
bc49d816 | 215 | [PF_MCTP] = "PF_MCTP", |
fe0bdbde YD |
216 | }; |
217 | ||
1da177e4 LT |
218 | /* |
219 | * The protocol list. Each protocol is registered in here. | |
220 | */ | |
221 | ||
1da177e4 | 222 | static DEFINE_SPINLOCK(net_family_lock); |
190683a9 | 223 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; |
1da177e4 | 224 | |
1da177e4 | 225 | /* |
89bddce5 SH |
226 | * Support routines. |
227 | * Move socket addresses back and forth across the kernel/user | |
228 | * divide and look after the messy bits. | |
1da177e4 LT |
229 | */ |
230 | ||
1da177e4 LT |
231 | /** |
232 | * move_addr_to_kernel - copy a socket address into kernel space | |
233 | * @uaddr: Address in user space | |
234 | * @kaddr: Address in kernel space | |
235 | * @ulen: Length in user space | |
236 | * | |
237 | * The address is copied into kernel space. If the provided address is | |
238 | * too long an error code of -EINVAL is returned. If the copy gives | |
239 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
240 | */ | |
241 | ||
43db362d | 242 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) |
1da177e4 | 243 | { |
230b1839 | 244 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
1da177e4 | 245 | return -EINVAL; |
89bddce5 | 246 | if (ulen == 0) |
1da177e4 | 247 | return 0; |
89bddce5 | 248 | if (copy_from_user(kaddr, uaddr, ulen)) |
1da177e4 | 249 | return -EFAULT; |
3ec3b2fb | 250 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
251 | } |
252 | ||
253 | /** | |
254 | * move_addr_to_user - copy an address to user space | |
255 | * @kaddr: kernel space address | |
256 | * @klen: length of address in kernel | |
257 | * @uaddr: user space address | |
258 | * @ulen: pointer to user length field | |
259 | * | |
260 | * The value pointed to by ulen on entry is the buffer length available. | |
261 | * This is overwritten with the buffer space used. -EINVAL is returned | |
262 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
263 | * is returned if either the buffer or the length field are not | |
264 | * accessible. | |
265 | * After copying the data up to the limit the user specifies, the true | |
266 | * length of the data is written over the length limit the user | |
267 | * specified. Zero is returned for a success. | |
268 | */ | |
89bddce5 | 269 | |
43db362d | 270 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, |
11165f14 | 271 | void __user *uaddr, int __user *ulen) |
1da177e4 LT |
272 | { |
273 | int err; | |
274 | int len; | |
275 | ||
68c6beb3 | 276 | BUG_ON(klen > sizeof(struct sockaddr_storage)); |
89bddce5 SH |
277 | err = get_user(len, ulen); |
278 | if (err) | |
1da177e4 | 279 | return err; |
89bddce5 SH |
280 | if (len > klen) |
281 | len = klen; | |
68c6beb3 | 282 | if (len < 0) |
1da177e4 | 283 | return -EINVAL; |
89bddce5 | 284 | if (len) { |
d6fe3945 SG |
285 | if (audit_sockaddr(klen, kaddr)) |
286 | return -ENOMEM; | |
89bddce5 | 287 | if (copy_to_user(uaddr, kaddr, len)) |
1da177e4 LT |
288 | return -EFAULT; |
289 | } | |
290 | /* | |
89bddce5 SH |
291 | * "fromlen shall refer to the value before truncation.." |
292 | * 1003.1g | |
1da177e4 LT |
293 | */ |
294 | return __put_user(klen, ulen); | |
295 | } | |
296 | ||
08009a76 | 297 | static struct kmem_cache *sock_inode_cachep __ro_after_init; |
1da177e4 LT |
298 | |
299 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
300 | { | |
301 | struct socket_alloc *ei; | |
89bddce5 | 302 | |
e94b1766 | 303 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
304 | if (!ei) |
305 | return NULL; | |
333f7909 AV |
306 | init_waitqueue_head(&ei->socket.wq.wait); |
307 | ei->socket.wq.fasync_list = NULL; | |
308 | ei->socket.wq.flags = 0; | |
89bddce5 | 309 | |
1da177e4 LT |
310 | ei->socket.state = SS_UNCONNECTED; |
311 | ei->socket.flags = 0; | |
312 | ei->socket.ops = NULL; | |
313 | ei->socket.sk = NULL; | |
314 | ei->socket.file = NULL; | |
1da177e4 LT |
315 | |
316 | return &ei->vfs_inode; | |
317 | } | |
318 | ||
6d7855c5 | 319 | static void sock_free_inode(struct inode *inode) |
1da177e4 | 320 | { |
43815482 ED |
321 | struct socket_alloc *ei; |
322 | ||
323 | ei = container_of(inode, struct socket_alloc, vfs_inode); | |
43815482 | 324 | kmem_cache_free(sock_inode_cachep, ei); |
1da177e4 LT |
325 | } |
326 | ||
51cc5068 | 327 | static void init_once(void *foo) |
1da177e4 | 328 | { |
89bddce5 | 329 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
1da177e4 | 330 | |
a35afb83 | 331 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 332 | } |
89bddce5 | 333 | |
1e911632 | 334 | static void init_inodecache(void) |
1da177e4 LT |
335 | { |
336 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
89bddce5 SH |
337 | sizeof(struct socket_alloc), |
338 | 0, | |
339 | (SLAB_HWCACHE_ALIGN | | |
340 | SLAB_RECLAIM_ACCOUNT | | |
5d097056 | 341 | SLAB_MEM_SPREAD | SLAB_ACCOUNT), |
20c2df83 | 342 | init_once); |
1e911632 | 343 | BUG_ON(sock_inode_cachep == NULL); |
1da177e4 LT |
344 | } |
345 | ||
b87221de | 346 | static const struct super_operations sockfs_ops = { |
c6d409cf | 347 | .alloc_inode = sock_alloc_inode, |
6d7855c5 | 348 | .free_inode = sock_free_inode, |
c6d409cf | 349 | .statfs = simple_statfs, |
1da177e4 LT |
350 | }; |
351 | ||
c23fbb6b ED |
352 | /* |
353 | * sockfs_dname() is called from d_path(). | |
354 | */ | |
355 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
356 | { | |
357 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", | |
c5ef6035 | 358 | d_inode(dentry)->i_ino); |
c23fbb6b ED |
359 | } |
360 | ||
3ba13d17 | 361 | static const struct dentry_operations sockfs_dentry_operations = { |
c23fbb6b | 362 | .d_dname = sockfs_dname, |
1da177e4 LT |
363 | }; |
364 | ||
bba0bd31 AG |
365 | static int sockfs_xattr_get(const struct xattr_handler *handler, |
366 | struct dentry *dentry, struct inode *inode, | |
367 | const char *suffix, void *value, size_t size) | |
368 | { | |
369 | if (value) { | |
370 | if (dentry->d_name.len + 1 > size) | |
371 | return -ERANGE; | |
372 | memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); | |
373 | } | |
374 | return dentry->d_name.len + 1; | |
375 | } | |
376 | ||
377 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
378 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
379 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
380 | ||
381 | static const struct xattr_handler sockfs_xattr_handler = { | |
382 | .name = XATTR_NAME_SOCKPROTONAME, | |
383 | .get = sockfs_xattr_get, | |
384 | }; | |
385 | ||
4a590153 | 386 | static int sockfs_security_xattr_set(const struct xattr_handler *handler, |
e65ce2a5 | 387 | struct user_namespace *mnt_userns, |
4a590153 AG |
388 | struct dentry *dentry, struct inode *inode, |
389 | const char *suffix, const void *value, | |
390 | size_t size, int flags) | |
391 | { | |
392 | /* Handled by LSM. */ | |
393 | return -EAGAIN; | |
394 | } | |
395 | ||
396 | static const struct xattr_handler sockfs_security_xattr_handler = { | |
397 | .prefix = XATTR_SECURITY_PREFIX, | |
398 | .set = sockfs_security_xattr_set, | |
399 | }; | |
400 | ||
bba0bd31 AG |
401 | static const struct xattr_handler *sockfs_xattr_handlers[] = { |
402 | &sockfs_xattr_handler, | |
4a590153 | 403 | &sockfs_security_xattr_handler, |
bba0bd31 AG |
404 | NULL |
405 | }; | |
406 | ||
fba9be49 | 407 | static int sockfs_init_fs_context(struct fs_context *fc) |
c74a1cbb | 408 | { |
fba9be49 DH |
409 | struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC); |
410 | if (!ctx) | |
411 | return -ENOMEM; | |
412 | ctx->ops = &sockfs_ops; | |
413 | ctx->dops = &sockfs_dentry_operations; | |
414 | ctx->xattr = sockfs_xattr_handlers; | |
415 | return 0; | |
c74a1cbb AV |
416 | } |
417 | ||
418 | static struct vfsmount *sock_mnt __read_mostly; | |
419 | ||
420 | static struct file_system_type sock_fs_type = { | |
421 | .name = "sockfs", | |
fba9be49 | 422 | .init_fs_context = sockfs_init_fs_context, |
c74a1cbb AV |
423 | .kill_sb = kill_anon_super, |
424 | }; | |
425 | ||
1da177e4 LT |
426 | /* |
427 | * Obtains the first available file descriptor and sets it up for use. | |
428 | * | |
39d8c1b6 DM |
429 | * These functions create file structures and maps them to fd space |
430 | * of the current process. On success it returns file descriptor | |
1da177e4 LT |
431 | * and file struct implicitly stored in sock->file. |
432 | * Note that another thread may close file descriptor before we return | |
433 | * from this function. We use the fact that now we do not refer | |
434 | * to socket after mapping. If one day we will need it, this | |
435 | * function will increment ref. count on file by 1. | |
436 | * | |
437 | * In any case returned fd MAY BE not valid! | |
438 | * This race condition is unavoidable | |
439 | * with shared fd spaces, we cannot solve it inside kernel, | |
440 | * but we take care of internal coherence yet. | |
441 | */ | |
442 | ||
8a3c245c PT |
443 | /** |
444 | * sock_alloc_file - Bind a &socket to a &file | |
445 | * @sock: socket | |
446 | * @flags: file status flags | |
447 | * @dname: protocol name | |
448 | * | |
449 | * Returns the &file bound with @sock, implicitly storing it | |
450 | * in sock->file. If dname is %NULL, sets to "". | |
451 | * On failure the return is a ERR pointer (see linux/err.h). | |
452 | * This function uses GFP_KERNEL internally. | |
453 | */ | |
454 | ||
aab174f0 | 455 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) |
1da177e4 | 456 | { |
7cbe66b6 | 457 | struct file *file; |
1da177e4 | 458 | |
d93aa9d8 AV |
459 | if (!dname) |
460 | dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; | |
39d8c1b6 | 461 | |
d93aa9d8 AV |
462 | file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, |
463 | O_RDWR | (flags & O_NONBLOCK), | |
464 | &socket_file_ops); | |
b5ffe634 | 465 | if (IS_ERR(file)) { |
8e1611e2 | 466 | sock_release(sock); |
39b65252 | 467 | return file; |
cc3808f8 AV |
468 | } |
469 | ||
470 | sock->file = file; | |
39d8c1b6 | 471 | file->private_data = sock; |
d8e464ec | 472 | stream_open(SOCK_INODE(sock), file); |
28407630 | 473 | return file; |
39d8c1b6 | 474 | } |
56b31d1c | 475 | EXPORT_SYMBOL(sock_alloc_file); |
39d8c1b6 | 476 | |
56b31d1c | 477 | static int sock_map_fd(struct socket *sock, int flags) |
39d8c1b6 DM |
478 | { |
479 | struct file *newfile; | |
28407630 | 480 | int fd = get_unused_fd_flags(flags); |
ce4bb04c AV |
481 | if (unlikely(fd < 0)) { |
482 | sock_release(sock); | |
28407630 | 483 | return fd; |
ce4bb04c | 484 | } |
39d8c1b6 | 485 | |
aab174f0 | 486 | newfile = sock_alloc_file(sock, flags, NULL); |
4546e44c | 487 | if (!IS_ERR(newfile)) { |
39d8c1b6 | 488 | fd_install(fd, newfile); |
28407630 AV |
489 | return fd; |
490 | } | |
7cbe66b6 | 491 | |
28407630 AV |
492 | put_unused_fd(fd); |
493 | return PTR_ERR(newfile); | |
1da177e4 LT |
494 | } |
495 | ||
8a3c245c PT |
496 | /** |
497 | * sock_from_file - Return the &socket bounded to @file. | |
498 | * @file: file | |
8a3c245c | 499 | * |
dba4a925 | 500 | * On failure returns %NULL. |
8a3c245c PT |
501 | */ |
502 | ||
dba4a925 | 503 | struct socket *sock_from_file(struct file *file) |
6cb153ca | 504 | { |
6cb153ca BL |
505 | if (file->f_op == &socket_file_ops) |
506 | return file->private_data; /* set in sock_map_fd */ | |
507 | ||
23bb80d2 | 508 | return NULL; |
6cb153ca | 509 | } |
406a3c63 | 510 | EXPORT_SYMBOL(sock_from_file); |
6cb153ca | 511 | |
1da177e4 | 512 | /** |
c6d409cf | 513 | * sockfd_lookup - Go from a file number to its socket slot |
1da177e4 LT |
514 | * @fd: file handle |
515 | * @err: pointer to an error code return | |
516 | * | |
517 | * The file handle passed in is locked and the socket it is bound | |
241c4667 | 518 | * to is returned. If an error occurs the err pointer is overwritten |
1da177e4 LT |
519 | * with a negative errno code and NULL is returned. The function checks |
520 | * for both invalid handles and passing a handle which is not a socket. | |
521 | * | |
522 | * On a success the socket object pointer is returned. | |
523 | */ | |
524 | ||
525 | struct socket *sockfd_lookup(int fd, int *err) | |
526 | { | |
527 | struct file *file; | |
1da177e4 LT |
528 | struct socket *sock; |
529 | ||
89bddce5 SH |
530 | file = fget(fd); |
531 | if (!file) { | |
1da177e4 LT |
532 | *err = -EBADF; |
533 | return NULL; | |
534 | } | |
89bddce5 | 535 | |
dba4a925 FR |
536 | sock = sock_from_file(file); |
537 | if (!sock) { | |
538 | *err = -ENOTSOCK; | |
1da177e4 | 539 | fput(file); |
dba4a925 | 540 | } |
6cb153ca BL |
541 | return sock; |
542 | } | |
c6d409cf | 543 | EXPORT_SYMBOL(sockfd_lookup); |
1da177e4 | 544 | |
6cb153ca BL |
545 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
546 | { | |
00e188ef | 547 | struct fd f = fdget(fd); |
6cb153ca BL |
548 | struct socket *sock; |
549 | ||
3672558c | 550 | *err = -EBADF; |
00e188ef | 551 | if (f.file) { |
dba4a925 | 552 | sock = sock_from_file(f.file); |
00e188ef | 553 | if (likely(sock)) { |
ce787a5a | 554 | *fput_needed = f.flags & FDPUT_FPUT; |
6cb153ca | 555 | return sock; |
00e188ef | 556 | } |
dba4a925 | 557 | *err = -ENOTSOCK; |
00e188ef | 558 | fdput(f); |
1da177e4 | 559 | } |
6cb153ca | 560 | return NULL; |
1da177e4 LT |
561 | } |
562 | ||
600e1779 MY |
563 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, |
564 | size_t size) | |
565 | { | |
566 | ssize_t len; | |
567 | ssize_t used = 0; | |
568 | ||
c5ef6035 | 569 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); |
600e1779 MY |
570 | if (len < 0) |
571 | return len; | |
572 | used += len; | |
573 | if (buffer) { | |
574 | if (size < used) | |
575 | return -ERANGE; | |
576 | buffer += len; | |
577 | } | |
578 | ||
579 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
580 | used += len; | |
581 | if (buffer) { | |
582 | if (size < used) | |
583 | return -ERANGE; | |
584 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
585 | buffer += len; | |
586 | } | |
587 | ||
588 | return used; | |
589 | } | |
590 | ||
549c7297 CB |
591 | static int sockfs_setattr(struct user_namespace *mnt_userns, |
592 | struct dentry *dentry, struct iattr *iattr) | |
86741ec2 | 593 | { |
549c7297 | 594 | int err = simple_setattr(&init_user_ns, dentry, iattr); |
86741ec2 | 595 | |
e1a3a60a | 596 | if (!err && (iattr->ia_valid & ATTR_UID)) { |
86741ec2 LC |
597 | struct socket *sock = SOCKET_I(d_inode(dentry)); |
598 | ||
6d8c50dc CW |
599 | if (sock->sk) |
600 | sock->sk->sk_uid = iattr->ia_uid; | |
601 | else | |
602 | err = -ENOENT; | |
86741ec2 LC |
603 | } |
604 | ||
605 | return err; | |
606 | } | |
607 | ||
600e1779 | 608 | static const struct inode_operations sockfs_inode_ops = { |
600e1779 | 609 | .listxattr = sockfs_listxattr, |
86741ec2 | 610 | .setattr = sockfs_setattr, |
600e1779 MY |
611 | }; |
612 | ||
1da177e4 | 613 | /** |
8a3c245c | 614 | * sock_alloc - allocate a socket |
89bddce5 | 615 | * |
1da177e4 LT |
616 | * Allocate a new inode and socket object. The two are bound together |
617 | * and initialised. The socket is then returned. If we are out of inodes | |
8a3c245c | 618 | * NULL is returned. This functions uses GFP_KERNEL internally. |
1da177e4 LT |
619 | */ |
620 | ||
f4a00aac | 621 | struct socket *sock_alloc(void) |
1da177e4 | 622 | { |
89bddce5 SH |
623 | struct inode *inode; |
624 | struct socket *sock; | |
1da177e4 | 625 | |
a209dfc7 | 626 | inode = new_inode_pseudo(sock_mnt->mnt_sb); |
1da177e4 LT |
627 | if (!inode) |
628 | return NULL; | |
629 | ||
630 | sock = SOCKET_I(inode); | |
631 | ||
85fe4025 | 632 | inode->i_ino = get_next_ino(); |
89bddce5 | 633 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
8192b0c4 DH |
634 | inode->i_uid = current_fsuid(); |
635 | inode->i_gid = current_fsgid(); | |
600e1779 | 636 | inode->i_op = &sockfs_inode_ops; |
1da177e4 | 637 | |
1da177e4 LT |
638 | return sock; |
639 | } | |
f4a00aac | 640 | EXPORT_SYMBOL(sock_alloc); |
1da177e4 | 641 | |
6d8c50dc | 642 | static void __sock_release(struct socket *sock, struct inode *inode) |
1da177e4 LT |
643 | { |
644 | if (sock->ops) { | |
645 | struct module *owner = sock->ops->owner; | |
646 | ||
6d8c50dc CW |
647 | if (inode) |
648 | inode_lock(inode); | |
1da177e4 | 649 | sock->ops->release(sock); |
ff7b11aa | 650 | sock->sk = NULL; |
6d8c50dc CW |
651 | if (inode) |
652 | inode_unlock(inode); | |
1da177e4 LT |
653 | sock->ops = NULL; |
654 | module_put(owner); | |
655 | } | |
656 | ||
333f7909 | 657 | if (sock->wq.fasync_list) |
3410f22e | 658 | pr_err("%s: fasync list not empty!\n", __func__); |
1da177e4 | 659 | |
1da177e4 LT |
660 | if (!sock->file) { |
661 | iput(SOCK_INODE(sock)); | |
662 | return; | |
663 | } | |
89bddce5 | 664 | sock->file = NULL; |
1da177e4 | 665 | } |
6d8c50dc | 666 | |
9a8ad9ac AL |
667 | /** |
668 | * sock_release - close a socket | |
669 | * @sock: socket to close | |
670 | * | |
671 | * The socket is released from the protocol stack if it has a release | |
672 | * callback, and the inode is then released if the socket is bound to | |
673 | * an inode not a file. | |
674 | */ | |
6d8c50dc CW |
675 | void sock_release(struct socket *sock) |
676 | { | |
677 | __sock_release(sock, NULL); | |
678 | } | |
c6d409cf | 679 | EXPORT_SYMBOL(sock_release); |
1da177e4 | 680 | |
c14ac945 | 681 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) |
20d49473 | 682 | { |
140c55d4 ED |
683 | u8 flags = *tx_flags; |
684 | ||
c14ac945 | 685 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) |
140c55d4 ED |
686 | flags |= SKBTX_HW_TSTAMP; |
687 | ||
c14ac945 | 688 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) |
140c55d4 ED |
689 | flags |= SKBTX_SW_TSTAMP; |
690 | ||
c14ac945 | 691 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) |
140c55d4 ED |
692 | flags |= SKBTX_SCHED_TSTAMP; |
693 | ||
140c55d4 | 694 | *tx_flags = flags; |
20d49473 | 695 | } |
67cc0d40 | 696 | EXPORT_SYMBOL(__sock_tx_timestamp); |
20d49473 | 697 | |
8c3c447b PA |
698 | INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *, |
699 | size_t)); | |
a648a592 PA |
700 | INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *, |
701 | size_t)); | |
d8725c86 | 702 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) |
1da177e4 | 703 | { |
a648a592 PA |
704 | int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg, |
705 | inet_sendmsg, sock, msg, | |
706 | msg_data_left(msg)); | |
d8725c86 AV |
707 | BUG_ON(ret == -EIOCBQUEUED); |
708 | return ret; | |
1da177e4 LT |
709 | } |
710 | ||
85806af0 RD |
711 | /** |
712 | * sock_sendmsg - send a message through @sock | |
713 | * @sock: socket | |
714 | * @msg: message to send | |
715 | * | |
716 | * Sends @msg through @sock, passing through LSM. | |
717 | * Returns the number of bytes sent, or an error code. | |
718 | */ | |
d8725c86 | 719 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) |
228e548e | 720 | { |
d8725c86 | 721 | int err = security_socket_sendmsg(sock, msg, |
01e97e65 | 722 | msg_data_left(msg)); |
228e548e | 723 | |
d8725c86 | 724 | return err ?: sock_sendmsg_nosec(sock, msg); |
0cf00c6f | 725 | } |
c6d409cf | 726 | EXPORT_SYMBOL(sock_sendmsg); |
1da177e4 | 727 | |
8a3c245c PT |
728 | /** |
729 | * kernel_sendmsg - send a message through @sock (kernel-space) | |
730 | * @sock: socket | |
731 | * @msg: message header | |
732 | * @vec: kernel vec | |
733 | * @num: vec array length | |
734 | * @size: total message data size | |
735 | * | |
736 | * Builds the message data with @vec and sends it through @sock. | |
737 | * Returns the number of bytes sent, or an error code. | |
738 | */ | |
739 | ||
1da177e4 LT |
740 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
741 | struct kvec *vec, size_t num, size_t size) | |
742 | { | |
aa563d7b | 743 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
d8725c86 | 744 | return sock_sendmsg(sock, msg); |
1da177e4 | 745 | } |
c6d409cf | 746 | EXPORT_SYMBOL(kernel_sendmsg); |
1da177e4 | 747 | |
8a3c245c PT |
748 | /** |
749 | * kernel_sendmsg_locked - send a message through @sock (kernel-space) | |
750 | * @sk: sock | |
751 | * @msg: message header | |
752 | * @vec: output s/g array | |
753 | * @num: output s/g array length | |
754 | * @size: total message data size | |
755 | * | |
756 | * Builds the message data with @vec and sends it through @sock. | |
757 | * Returns the number of bytes sent, or an error code. | |
758 | * Caller must hold @sk. | |
759 | */ | |
760 | ||
306b13eb TH |
761 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, |
762 | struct kvec *vec, size_t num, size_t size) | |
763 | { | |
764 | struct socket *sock = sk->sk_socket; | |
765 | ||
766 | if (!sock->ops->sendmsg_locked) | |
db5980d8 | 767 | return sock_no_sendmsg_locked(sk, msg, size); |
306b13eb | 768 | |
aa563d7b | 769 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
306b13eb TH |
770 | |
771 | return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); | |
772 | } | |
773 | EXPORT_SYMBOL(kernel_sendmsg_locked); | |
774 | ||
8605330a SHY |
775 | static bool skb_is_err_queue(const struct sk_buff *skb) |
776 | { | |
777 | /* pkt_type of skbs enqueued on the error queue are set to | |
778 | * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do | |
779 | * in recvmsg, since skbs received on a local socket will never | |
780 | * have a pkt_type of PACKET_OUTGOING. | |
781 | */ | |
782 | return skb->pkt_type == PACKET_OUTGOING; | |
783 | } | |
784 | ||
b50a5c70 ML |
785 | /* On transmit, software and hardware timestamps are returned independently. |
786 | * As the two skb clones share the hardware timestamp, which may be updated | |
787 | * before the software timestamp is received, a hardware TX timestamp may be | |
788 | * returned only if there is no software TX timestamp. Ignore false software | |
789 | * timestamps, which may be made in the __sock_recv_timestamp() call when the | |
7f1bc6e9 | 790 | * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a |
b50a5c70 ML |
791 | * hardware timestamp. |
792 | */ | |
793 | static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) | |
794 | { | |
795 | return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); | |
796 | } | |
797 | ||
aad9c8c4 ML |
798 | static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
799 | { | |
800 | struct scm_ts_pktinfo ts_pktinfo; | |
801 | struct net_device *orig_dev; | |
802 | ||
803 | if (!skb_mac_header_was_set(skb)) | |
804 | return; | |
805 | ||
806 | memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); | |
807 | ||
808 | rcu_read_lock(); | |
809 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
810 | if (orig_dev) | |
811 | ts_pktinfo.if_index = orig_dev->ifindex; | |
812 | rcu_read_unlock(); | |
813 | ||
814 | ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); | |
815 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, | |
816 | sizeof(ts_pktinfo), &ts_pktinfo); | |
817 | } | |
818 | ||
92f37fd2 ED |
819 | /* |
820 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
821 | */ | |
822 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
823 | struct sk_buff *skb) | |
824 | { | |
20d49473 | 825 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
887feae3 | 826 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
9718475e DD |
827 | struct scm_timestamping_internal tss; |
828 | ||
b50a5c70 | 829 | int empty = 1, false_tstamp = 0; |
20d49473 PO |
830 | struct skb_shared_hwtstamps *shhwtstamps = |
831 | skb_hwtstamps(skb); | |
832 | ||
833 | /* Race occurred between timestamp enabling and packet | |
834 | receiving. Fill in the current time for now. */ | |
b50a5c70 | 835 | if (need_software_tstamp && skb->tstamp == 0) { |
20d49473 | 836 | __net_timestamp(skb); |
b50a5c70 ML |
837 | false_tstamp = 1; |
838 | } | |
20d49473 PO |
839 | |
840 | if (need_software_tstamp) { | |
841 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 DD |
842 | if (new_tstamp) { |
843 | struct __kernel_sock_timeval tv; | |
844 | ||
845 | skb_get_new_timestamp(skb, &tv); | |
846 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, | |
847 | sizeof(tv), &tv); | |
848 | } else { | |
849 | struct __kernel_old_timeval tv; | |
850 | ||
851 | skb_get_timestamp(skb, &tv); | |
852 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, | |
853 | sizeof(tv), &tv); | |
854 | } | |
20d49473 | 855 | } else { |
887feae3 DD |
856 | if (new_tstamp) { |
857 | struct __kernel_timespec ts; | |
858 | ||
859 | skb_get_new_timestampns(skb, &ts); | |
860 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, | |
861 | sizeof(ts), &ts); | |
862 | } else { | |
df1b4ba9 | 863 | struct __kernel_old_timespec ts; |
887feae3 DD |
864 | |
865 | skb_get_timestampns(skb, &ts); | |
866 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, | |
867 | sizeof(ts), &ts); | |
868 | } | |
20d49473 PO |
869 | } |
870 | } | |
871 | ||
f24b9be5 | 872 | memset(&tss, 0, sizeof(tss)); |
c199105d | 873 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && |
9718475e | 874 | ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) |
20d49473 | 875 | empty = 0; |
4d276eb6 | 876 | if (shhwtstamps && |
b9f40e21 | 877 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
d7c08826 YL |
878 | !skb_is_swtx_tstamp(skb, false_tstamp)) { |
879 | if (sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC) | |
880 | ptp_convert_timestamp(shhwtstamps, sk->sk_bind_phc); | |
881 | ||
882 | if (ktime_to_timespec64_cond(shhwtstamps->hwtstamp, | |
883 | tss.ts + 2)) { | |
884 | empty = 0; | |
885 | ||
886 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && | |
887 | !skb_is_err_queue(skb)) | |
888 | put_ts_pktinfo(msg, skb); | |
889 | } | |
aad9c8c4 | 890 | } |
1c885808 | 891 | if (!empty) { |
9718475e DD |
892 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) |
893 | put_cmsg_scm_timestamping64(msg, &tss); | |
894 | else | |
895 | put_cmsg_scm_timestamping(msg, &tss); | |
1c885808 | 896 | |
8605330a | 897 | if (skb_is_err_queue(skb) && skb->len && |
4ef1b286 | 898 | SKB_EXT_ERR(skb)->opt_stats) |
1c885808 FY |
899 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, |
900 | skb->len, skb->data); | |
901 | } | |
92f37fd2 | 902 | } |
7c81fd8b ACM |
903 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
904 | ||
6e3e939f JB |
905 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
906 | struct sk_buff *skb) | |
907 | { | |
908 | int ack; | |
909 | ||
910 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
911 | return; | |
912 | if (!skb->wifi_acked_valid) | |
913 | return; | |
914 | ||
915 | ack = skb->wifi_acked; | |
916 | ||
917 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
918 | } | |
919 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
920 | ||
11165f14 | 921 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
922 | struct sk_buff *skb) | |
3b885787 | 923 | { |
744d5a3e | 924 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) |
3b885787 | 925 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
744d5a3e | 926 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); |
3b885787 NH |
927 | } |
928 | ||
767dd033 | 929 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
3b885787 NH |
930 | struct sk_buff *skb) |
931 | { | |
932 | sock_recv_timestamp(msg, sk, skb); | |
933 | sock_recv_drops(msg, sk, skb); | |
934 | } | |
767dd033 | 935 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); |
3b885787 | 936 | |
8c3c447b | 937 | INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *, |
a648a592 PA |
938 | size_t, int)); |
939 | INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *, | |
940 | size_t, int)); | |
1b784140 | 941 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
2da62906 | 942 | int flags) |
1da177e4 | 943 | { |
a648a592 PA |
944 | return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg, |
945 | inet_recvmsg, sock, msg, msg_data_left(msg), | |
946 | flags); | |
1da177e4 LT |
947 | } |
948 | ||
85806af0 RD |
949 | /** |
950 | * sock_recvmsg - receive a message from @sock | |
951 | * @sock: socket | |
952 | * @msg: message to receive | |
953 | * @flags: message flags | |
954 | * | |
955 | * Receives @msg from @sock, passing through LSM. Returns the total number | |
956 | * of bytes received, or an error. | |
957 | */ | |
2da62906 | 958 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) |
a2e27255 | 959 | { |
2da62906 | 960 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); |
a2e27255 | 961 | |
2da62906 | 962 | return err ?: sock_recvmsg_nosec(sock, msg, flags); |
1da177e4 | 963 | } |
c6d409cf | 964 | EXPORT_SYMBOL(sock_recvmsg); |
1da177e4 | 965 | |
c1249c0a | 966 | /** |
8a3c245c PT |
967 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
968 | * @sock: The socket to receive the message from | |
969 | * @msg: Received message | |
970 | * @vec: Input s/g array for message data | |
971 | * @num: Size of input s/g array | |
972 | * @size: Number of bytes to read | |
973 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
c1249c0a | 974 | * |
8a3c245c PT |
975 | * On return the msg structure contains the scatter/gather array passed in the |
976 | * vec argument. The array is modified so that it consists of the unfilled | |
977 | * portion of the original array. | |
c1249c0a | 978 | * |
8a3c245c | 979 | * The returned value is the total number of bytes received, or an error. |
c1249c0a | 980 | */ |
8a3c245c | 981 | |
89bddce5 SH |
982 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
983 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 | 984 | { |
1f466e1f | 985 | msg->msg_control_is_user = false; |
aa563d7b | 986 | iov_iter_kvec(&msg->msg_iter, READ, vec, num, size); |
1f466e1f | 987 | return sock_recvmsg(sock, msg, flags); |
1da177e4 | 988 | } |
c6d409cf | 989 | EXPORT_SYMBOL(kernel_recvmsg); |
1da177e4 | 990 | |
ce1d4d3e CH |
991 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
992 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 993 | { |
1da177e4 LT |
994 | struct socket *sock; |
995 | int flags; | |
996 | ||
ce1d4d3e CH |
997 | sock = file->private_data; |
998 | ||
35f9c09f ED |
999 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
1000 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
1001 | flags |= more; | |
ce1d4d3e | 1002 | |
e6949583 | 1003 | return kernel_sendpage(sock, page, offset, size, flags); |
ce1d4d3e | 1004 | } |
1da177e4 | 1005 | |
9c55e01c | 1006 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 1007 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c JA |
1008 | unsigned int flags) |
1009 | { | |
1010 | struct socket *sock = file->private_data; | |
1011 | ||
997b37da | 1012 | if (unlikely(!sock->ops->splice_read)) |
95506588 | 1013 | return generic_file_splice_read(file, ppos, pipe, len, flags); |
997b37da | 1014 | |
9c55e01c JA |
1015 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
1016 | } | |
1017 | ||
8ae5e030 | 1018 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) |
ce1d4d3e | 1019 | { |
6d652330 AV |
1020 | struct file *file = iocb->ki_filp; |
1021 | struct socket *sock = file->private_data; | |
0345f931 | 1022 | struct msghdr msg = {.msg_iter = *to, |
1023 | .msg_iocb = iocb}; | |
8ae5e030 | 1024 | ssize_t res; |
ce1d4d3e | 1025 | |
ebfcd895 | 1026 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
1027 | msg.msg_flags = MSG_DONTWAIT; |
1028 | ||
1029 | if (iocb->ki_pos != 0) | |
1da177e4 | 1030 | return -ESPIPE; |
027445c3 | 1031 | |
66ee59af | 1032 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ |
1da177e4 LT |
1033 | return 0; |
1034 | ||
2da62906 | 1035 | res = sock_recvmsg(sock, &msg, msg.msg_flags); |
8ae5e030 AV |
1036 | *to = msg.msg_iter; |
1037 | return res; | |
1da177e4 LT |
1038 | } |
1039 | ||
8ae5e030 | 1040 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ce1d4d3e | 1041 | { |
6d652330 AV |
1042 | struct file *file = iocb->ki_filp; |
1043 | struct socket *sock = file->private_data; | |
0345f931 | 1044 | struct msghdr msg = {.msg_iter = *from, |
1045 | .msg_iocb = iocb}; | |
8ae5e030 | 1046 | ssize_t res; |
1da177e4 | 1047 | |
8ae5e030 | 1048 | if (iocb->ki_pos != 0) |
ce1d4d3e | 1049 | return -ESPIPE; |
027445c3 | 1050 | |
ebfcd895 | 1051 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
1052 | msg.msg_flags = MSG_DONTWAIT; |
1053 | ||
6d652330 AV |
1054 | if (sock->type == SOCK_SEQPACKET) |
1055 | msg.msg_flags |= MSG_EOR; | |
1056 | ||
d8725c86 | 1057 | res = sock_sendmsg(sock, &msg); |
8ae5e030 AV |
1058 | *from = msg.msg_iter; |
1059 | return res; | |
1da177e4 LT |
1060 | } |
1061 | ||
1da177e4 LT |
1062 | /* |
1063 | * Atomic setting of ioctl hooks to avoid race | |
1064 | * with module unload. | |
1065 | */ | |
1066 | ||
4a3e2f71 | 1067 | static DEFINE_MUTEX(br_ioctl_mutex); |
ad2f99ae AB |
1068 | static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br, |
1069 | unsigned int cmd, struct ifreq *ifr, | |
1070 | void __user *uarg); | |
1da177e4 | 1071 | |
ad2f99ae AB |
1072 | void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br, |
1073 | unsigned int cmd, struct ifreq *ifr, | |
1074 | void __user *uarg)) | |
1da177e4 | 1075 | { |
4a3e2f71 | 1076 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 1077 | br_ioctl_hook = hook; |
4a3e2f71 | 1078 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1079 | } |
1080 | EXPORT_SYMBOL(brioctl_set); | |
1081 | ||
ad2f99ae AB |
1082 | int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd, |
1083 | struct ifreq *ifr, void __user *uarg) | |
1084 | { | |
1085 | int err = -ENOPKG; | |
1086 | ||
1087 | if (!br_ioctl_hook) | |
1088 | request_module("bridge"); | |
1089 | ||
1090 | mutex_lock(&br_ioctl_mutex); | |
1091 | if (br_ioctl_hook) | |
1092 | err = br_ioctl_hook(net, br, cmd, ifr, uarg); | |
1093 | mutex_unlock(&br_ioctl_mutex); | |
1094 | ||
1095 | return err; | |
1096 | } | |
1097 | ||
4a3e2f71 | 1098 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 1099 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 1100 | |
881d966b | 1101 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 1102 | { |
4a3e2f71 | 1103 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1104 | vlan_ioctl_hook = hook; |
4a3e2f71 | 1105 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 LT |
1106 | } |
1107 | EXPORT_SYMBOL(vlan_ioctl_set); | |
1108 | ||
6b96018b | 1109 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
63ff03ab | 1110 | unsigned int cmd, unsigned long arg) |
6b96018b | 1111 | { |
876f0bf9 AB |
1112 | struct ifreq ifr; |
1113 | bool need_copyout; | |
6b96018b AB |
1114 | int err; |
1115 | void __user *argp = (void __user *)arg; | |
a554bf96 | 1116 | void __user *data; |
6b96018b AB |
1117 | |
1118 | err = sock->ops->ioctl(sock, cmd, arg); | |
1119 | ||
1120 | /* | |
1121 | * If this ioctl is unknown try to hand it down | |
1122 | * to the NIC driver. | |
1123 | */ | |
36fd633e AV |
1124 | if (err != -ENOIOCTLCMD) |
1125 | return err; | |
6b96018b | 1126 | |
29ce8f97 JK |
1127 | if (!is_socket_ioctl_cmd(cmd)) |
1128 | return -ENOTTY; | |
1129 | ||
a554bf96 | 1130 | if (get_user_ifreq(&ifr, &data, argp)) |
876f0bf9 | 1131 | return -EFAULT; |
a554bf96 | 1132 | err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); |
876f0bf9 | 1133 | if (!err && need_copyout) |
a554bf96 | 1134 | if (put_user_ifreq(&ifr, argp)) |
44c02a2c | 1135 | return -EFAULT; |
876f0bf9 | 1136 | |
6b96018b AB |
1137 | return err; |
1138 | } | |
1139 | ||
1da177e4 LT |
1140 | /* |
1141 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
1142 | * what to do with it - that's up to the protocol still. | |
1143 | */ | |
1144 | ||
1145 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
1146 | { | |
1147 | struct socket *sock; | |
881d966b | 1148 | struct sock *sk; |
1da177e4 LT |
1149 | void __user *argp = (void __user *)arg; |
1150 | int pid, err; | |
881d966b | 1151 | struct net *net; |
1da177e4 | 1152 | |
b69aee04 | 1153 | sock = file->private_data; |
881d966b | 1154 | sk = sock->sk; |
3b1e0a65 | 1155 | net = sock_net(sk); |
44c02a2c AV |
1156 | if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { |
1157 | struct ifreq ifr; | |
a554bf96 | 1158 | void __user *data; |
44c02a2c | 1159 | bool need_copyout; |
a554bf96 | 1160 | if (get_user_ifreq(&ifr, &data, argp)) |
44c02a2c | 1161 | return -EFAULT; |
a554bf96 | 1162 | err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); |
44c02a2c | 1163 | if (!err && need_copyout) |
a554bf96 | 1164 | if (put_user_ifreq(&ifr, argp)) |
44c02a2c | 1165 | return -EFAULT; |
1da177e4 | 1166 | } else |
3d23e349 | 1167 | #ifdef CONFIG_WEXT_CORE |
1da177e4 | 1168 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
b1b0c245 | 1169 | err = wext_handle_ioctl(net, cmd, argp); |
1da177e4 | 1170 | } else |
3d23e349 | 1171 | #endif |
89bddce5 | 1172 | switch (cmd) { |
1da177e4 LT |
1173 | case FIOSETOWN: |
1174 | case SIOCSPGRP: | |
1175 | err = -EFAULT; | |
1176 | if (get_user(pid, (int __user *)argp)) | |
1177 | break; | |
393cc3f5 | 1178 | err = f_setown(sock->file, pid, 1); |
1da177e4 LT |
1179 | break; |
1180 | case FIOGETOWN: | |
1181 | case SIOCGPGRP: | |
609d7fa9 | 1182 | err = put_user(f_getown(sock->file), |
89bddce5 | 1183 | (int __user *)argp); |
1da177e4 LT |
1184 | break; |
1185 | case SIOCGIFBR: | |
1186 | case SIOCSIFBR: | |
1187 | case SIOCBRADDBR: | |
1188 | case SIOCBRDELBR: | |
ad2f99ae | 1189 | err = br_ioctl_call(net, NULL, cmd, NULL, argp); |
1da177e4 LT |
1190 | break; |
1191 | case SIOCGIFVLAN: | |
1192 | case SIOCSIFVLAN: | |
1193 | err = -ENOPKG; | |
1194 | if (!vlan_ioctl_hook) | |
1195 | request_module("8021q"); | |
1196 | ||
4a3e2f71 | 1197 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1198 | if (vlan_ioctl_hook) |
881d966b | 1199 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 1200 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 1201 | break; |
c62cce2c AV |
1202 | case SIOCGSKNS: |
1203 | err = -EPERM; | |
1204 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1205 | break; | |
1206 | ||
1207 | err = open_related_ns(&net->ns, get_net_ns); | |
1208 | break; | |
0768e170 AB |
1209 | case SIOCGSTAMP_OLD: |
1210 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
1211 | if (!sock->ops->gettstamp) { |
1212 | err = -ENOIOCTLCMD; | |
1213 | break; | |
1214 | } | |
1215 | err = sock->ops->gettstamp(sock, argp, | |
0768e170 AB |
1216 | cmd == SIOCGSTAMP_OLD, |
1217 | !IS_ENABLED(CONFIG_64BIT)); | |
60747828 | 1218 | break; |
0768e170 AB |
1219 | case SIOCGSTAMP_NEW: |
1220 | case SIOCGSTAMPNS_NEW: | |
1221 | if (!sock->ops->gettstamp) { | |
1222 | err = -ENOIOCTLCMD; | |
1223 | break; | |
1224 | } | |
1225 | err = sock->ops->gettstamp(sock, argp, | |
1226 | cmd == SIOCGSTAMP_NEW, | |
1227 | false); | |
c7cbdbf2 | 1228 | break; |
876f0bf9 AB |
1229 | |
1230 | case SIOCGIFCONF: | |
1231 | err = dev_ifconf(net, argp); | |
1232 | break; | |
1233 | ||
1da177e4 | 1234 | default: |
63ff03ab | 1235 | err = sock_do_ioctl(net, sock, cmd, arg); |
1da177e4 | 1236 | break; |
89bddce5 | 1237 | } |
1da177e4 LT |
1238 | return err; |
1239 | } | |
1240 | ||
8a3c245c PT |
1241 | /** |
1242 | * sock_create_lite - creates a socket | |
1243 | * @family: protocol family (AF_INET, ...) | |
1244 | * @type: communication type (SOCK_STREAM, ...) | |
1245 | * @protocol: protocol (0, ...) | |
1246 | * @res: new socket | |
1247 | * | |
1248 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1249 | * The new socket initialization is not complete, see kernel_accept(). | |
1250 | * Returns 0 or an error. On failure @res is set to %NULL. | |
1251 | * This function internally uses GFP_KERNEL. | |
1252 | */ | |
1253 | ||
1da177e4 LT |
1254 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
1255 | { | |
1256 | int err; | |
1257 | struct socket *sock = NULL; | |
89bddce5 | 1258 | |
1da177e4 LT |
1259 | err = security_socket_create(family, type, protocol, 1); |
1260 | if (err) | |
1261 | goto out; | |
1262 | ||
1263 | sock = sock_alloc(); | |
1264 | if (!sock) { | |
1265 | err = -ENOMEM; | |
1266 | goto out; | |
1267 | } | |
1268 | ||
1da177e4 | 1269 | sock->type = type; |
7420ed23 VY |
1270 | err = security_socket_post_create(sock, family, type, protocol, 1); |
1271 | if (err) | |
1272 | goto out_release; | |
1273 | ||
1da177e4 LT |
1274 | out: |
1275 | *res = sock; | |
1276 | return err; | |
7420ed23 VY |
1277 | out_release: |
1278 | sock_release(sock); | |
1279 | sock = NULL; | |
1280 | goto out; | |
1da177e4 | 1281 | } |
c6d409cf | 1282 | EXPORT_SYMBOL(sock_create_lite); |
1da177e4 LT |
1283 | |
1284 | /* No kernel lock held - perfect */ | |
ade994f4 | 1285 | static __poll_t sock_poll(struct file *file, poll_table *wait) |
1da177e4 | 1286 | { |
3cafb376 | 1287 | struct socket *sock = file->private_data; |
a331de3b | 1288 | __poll_t events = poll_requested_events(wait), flag = 0; |
2d48d67f | 1289 | |
e88958e6 CH |
1290 | if (!sock->ops->poll) |
1291 | return 0; | |
f641f13b | 1292 | |
a331de3b CH |
1293 | if (sk_can_busy_loop(sock->sk)) { |
1294 | /* poll once if requested by the syscall */ | |
1295 | if (events & POLL_BUSY_LOOP) | |
1296 | sk_busy_loop(sock->sk, 1); | |
1297 | ||
1298 | /* if this socket can poll_ll, tell the system call */ | |
1299 | flag = POLL_BUSY_LOOP; | |
1300 | } | |
1301 | ||
1302 | return sock->ops->poll(file, sock, wait) | flag; | |
1da177e4 LT |
1303 | } |
1304 | ||
89bddce5 | 1305 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 1306 | { |
b69aee04 | 1307 | struct socket *sock = file->private_data; |
1da177e4 LT |
1308 | |
1309 | return sock->ops->mmap(file, sock, vma); | |
1310 | } | |
1311 | ||
20380731 | 1312 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 | 1313 | { |
6d8c50dc | 1314 | __sock_release(SOCKET_I(inode), inode); |
1da177e4 LT |
1315 | return 0; |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Update the socket async list | |
1320 | * | |
1321 | * Fasync_list locking strategy. | |
1322 | * | |
1323 | * 1. fasync_list is modified only under process context socket lock | |
1324 | * i.e. under semaphore. | |
1325 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
989a2979 | 1326 | * or under socket lock |
1da177e4 LT |
1327 | */ |
1328 | ||
1329 | static int sock_fasync(int fd, struct file *filp, int on) | |
1330 | { | |
989a2979 ED |
1331 | struct socket *sock = filp->private_data; |
1332 | struct sock *sk = sock->sk; | |
333f7909 | 1333 | struct socket_wq *wq = &sock->wq; |
1da177e4 | 1334 | |
989a2979 | 1335 | if (sk == NULL) |
1da177e4 | 1336 | return -EINVAL; |
1da177e4 LT |
1337 | |
1338 | lock_sock(sk); | |
eaefd110 | 1339 | fasync_helper(fd, filp, on, &wq->fasync_list); |
1da177e4 | 1340 | |
eaefd110 | 1341 | if (!wq->fasync_list) |
989a2979 ED |
1342 | sock_reset_flag(sk, SOCK_FASYNC); |
1343 | else | |
bcdce719 | 1344 | sock_set_flag(sk, SOCK_FASYNC); |
1da177e4 | 1345 | |
989a2979 | 1346 | release_sock(sk); |
1da177e4 LT |
1347 | return 0; |
1348 | } | |
1349 | ||
ceb5d58b | 1350 | /* This function may be called only under rcu_lock */ |
1da177e4 | 1351 | |
ceb5d58b | 1352 | int sock_wake_async(struct socket_wq *wq, int how, int band) |
1da177e4 | 1353 | { |
ceb5d58b | 1354 | if (!wq || !wq->fasync_list) |
1da177e4 | 1355 | return -1; |
ceb5d58b | 1356 | |
89bddce5 | 1357 | switch (how) { |
8d8ad9d7 | 1358 | case SOCK_WAKE_WAITD: |
ceb5d58b | 1359 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) |
1da177e4 LT |
1360 | break; |
1361 | goto call_kill; | |
8d8ad9d7 | 1362 | case SOCK_WAKE_SPACE: |
ceb5d58b | 1363 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) |
1da177e4 | 1364 | break; |
7c7ab580 | 1365 | fallthrough; |
8d8ad9d7 | 1366 | case SOCK_WAKE_IO: |
89bddce5 | 1367 | call_kill: |
43815482 | 1368 | kill_fasync(&wq->fasync_list, SIGIO, band); |
1da177e4 | 1369 | break; |
8d8ad9d7 | 1370 | case SOCK_WAKE_URG: |
43815482 | 1371 | kill_fasync(&wq->fasync_list, SIGURG, band); |
1da177e4 | 1372 | } |
ceb5d58b | 1373 | |
1da177e4 LT |
1374 | return 0; |
1375 | } | |
c6d409cf | 1376 | EXPORT_SYMBOL(sock_wake_async); |
1da177e4 | 1377 | |
8a3c245c PT |
1378 | /** |
1379 | * __sock_create - creates a socket | |
1380 | * @net: net namespace | |
1381 | * @family: protocol family (AF_INET, ...) | |
1382 | * @type: communication type (SOCK_STREAM, ...) | |
1383 | * @protocol: protocol (0, ...) | |
1384 | * @res: new socket | |
1385 | * @kern: boolean for kernel space sockets | |
1386 | * | |
1387 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1388 | * Returns 0 or an error. On failure @res is set to %NULL. @kern must | |
1389 | * be set to true if the socket resides in kernel space. | |
1390 | * This function internally uses GFP_KERNEL. | |
1391 | */ | |
1392 | ||
721db93a | 1393 | int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1394 | struct socket **res, int kern) |
1da177e4 LT |
1395 | { |
1396 | int err; | |
1397 | struct socket *sock; | |
55737fda | 1398 | const struct net_proto_family *pf; |
1da177e4 LT |
1399 | |
1400 | /* | |
89bddce5 | 1401 | * Check protocol is in range |
1da177e4 LT |
1402 | */ |
1403 | if (family < 0 || family >= NPROTO) | |
1404 | return -EAFNOSUPPORT; | |
1405 | if (type < 0 || type >= SOCK_MAX) | |
1406 | return -EINVAL; | |
1407 | ||
1408 | /* Compatibility. | |
1409 | ||
1410 | This uglymoron is moved from INET layer to here to avoid | |
1411 | deadlock in module load. | |
1412 | */ | |
1413 | if (family == PF_INET && type == SOCK_PACKET) { | |
f3c98690 | 1414 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1415 | current->comm); | |
1da177e4 LT |
1416 | family = PF_PACKET; |
1417 | } | |
1418 | ||
1419 | err = security_socket_create(family, type, protocol, kern); | |
1420 | if (err) | |
1421 | return err; | |
89bddce5 | 1422 | |
55737fda SH |
1423 | /* |
1424 | * Allocate the socket and allow the family to set things up. if | |
1425 | * the protocol is 0, the family is instructed to select an appropriate | |
1426 | * default. | |
1427 | */ | |
1428 | sock = sock_alloc(); | |
1429 | if (!sock) { | |
e87cc472 | 1430 | net_warn_ratelimited("socket: no more sockets\n"); |
55737fda SH |
1431 | return -ENFILE; /* Not exactly a match, but its the |
1432 | closest posix thing */ | |
1433 | } | |
1434 | ||
1435 | sock->type = type; | |
1436 | ||
95a5afca | 1437 | #ifdef CONFIG_MODULES |
89bddce5 SH |
1438 | /* Attempt to load a protocol module if the find failed. |
1439 | * | |
1440 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1441 | * requested real, full-featured networking support upon configuration. |
1442 | * Otherwise module support will break! | |
1443 | */ | |
190683a9 | 1444 | if (rcu_access_pointer(net_families[family]) == NULL) |
89bddce5 | 1445 | request_module("net-pf-%d", family); |
1da177e4 LT |
1446 | #endif |
1447 | ||
55737fda SH |
1448 | rcu_read_lock(); |
1449 | pf = rcu_dereference(net_families[family]); | |
1450 | err = -EAFNOSUPPORT; | |
1451 | if (!pf) | |
1452 | goto out_release; | |
1da177e4 LT |
1453 | |
1454 | /* | |
1455 | * We will call the ->create function, that possibly is in a loadable | |
1456 | * module, so we have to bump that loadable module refcnt first. | |
1457 | */ | |
55737fda | 1458 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1459 | goto out_release; |
1460 | ||
55737fda SH |
1461 | /* Now protected by module ref count */ |
1462 | rcu_read_unlock(); | |
1463 | ||
3f378b68 | 1464 | err = pf->create(net, sock, protocol, kern); |
55737fda | 1465 | if (err < 0) |
1da177e4 | 1466 | goto out_module_put; |
a79af59e | 1467 | |
1da177e4 LT |
1468 | /* |
1469 | * Now to bump the refcnt of the [loadable] module that owns this | |
1470 | * socket at sock_release time we decrement its refcnt. | |
1471 | */ | |
55737fda SH |
1472 | if (!try_module_get(sock->ops->owner)) |
1473 | goto out_module_busy; | |
1474 | ||
1da177e4 LT |
1475 | /* |
1476 | * Now that we're done with the ->create function, the [loadable] | |
1477 | * module can have its refcnt decremented | |
1478 | */ | |
55737fda | 1479 | module_put(pf->owner); |
7420ed23 VY |
1480 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1481 | if (err) | |
3b185525 | 1482 | goto out_sock_release; |
55737fda | 1483 | *res = sock; |
1da177e4 | 1484 | |
55737fda SH |
1485 | return 0; |
1486 | ||
1487 | out_module_busy: | |
1488 | err = -EAFNOSUPPORT; | |
1da177e4 | 1489 | out_module_put: |
55737fda SH |
1490 | sock->ops = NULL; |
1491 | module_put(pf->owner); | |
1492 | out_sock_release: | |
1da177e4 | 1493 | sock_release(sock); |
55737fda SH |
1494 | return err; |
1495 | ||
1496 | out_release: | |
1497 | rcu_read_unlock(); | |
1498 | goto out_sock_release; | |
1da177e4 | 1499 | } |
721db93a | 1500 | EXPORT_SYMBOL(__sock_create); |
1da177e4 | 1501 | |
8a3c245c PT |
1502 | /** |
1503 | * sock_create - creates a socket | |
1504 | * @family: protocol family (AF_INET, ...) | |
1505 | * @type: communication type (SOCK_STREAM, ...) | |
1506 | * @protocol: protocol (0, ...) | |
1507 | * @res: new socket | |
1508 | * | |
1509 | * A wrapper around __sock_create(). | |
1510 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1511 | */ | |
1512 | ||
1da177e4 LT |
1513 | int sock_create(int family, int type, int protocol, struct socket **res) |
1514 | { | |
1b8d7ae4 | 1515 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 | 1516 | } |
c6d409cf | 1517 | EXPORT_SYMBOL(sock_create); |
1da177e4 | 1518 | |
8a3c245c PT |
1519 | /** |
1520 | * sock_create_kern - creates a socket (kernel space) | |
1521 | * @net: net namespace | |
1522 | * @family: protocol family (AF_INET, ...) | |
1523 | * @type: communication type (SOCK_STREAM, ...) | |
1524 | * @protocol: protocol (0, ...) | |
1525 | * @res: new socket | |
1526 | * | |
1527 | * A wrapper around __sock_create(). | |
1528 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1529 | */ | |
1530 | ||
eeb1bd5c | 1531 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) |
1da177e4 | 1532 | { |
eeb1bd5c | 1533 | return __sock_create(net, family, type, protocol, res, 1); |
1da177e4 | 1534 | } |
c6d409cf | 1535 | EXPORT_SYMBOL(sock_create_kern); |
1da177e4 | 1536 | |
9d6a15c3 | 1537 | int __sys_socket(int family, int type, int protocol) |
1da177e4 LT |
1538 | { |
1539 | int retval; | |
1540 | struct socket *sock; | |
a677a039 UD |
1541 | int flags; |
1542 | ||
e38b36f3 UD |
1543 | /* Check the SOCK_* constants for consistency. */ |
1544 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1545 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1546 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1547 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1548 | ||
a677a039 | 1549 | flags = type & ~SOCK_TYPE_MASK; |
77d27200 | 1550 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1551 | return -EINVAL; |
1552 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1553 | |
aaca0bdc UD |
1554 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1555 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1556 | ||
1da177e4 LT |
1557 | retval = sock_create(family, type, protocol, &sock); |
1558 | if (retval < 0) | |
8e1611e2 | 1559 | return retval; |
1da177e4 | 1560 | |
8e1611e2 | 1561 | return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1da177e4 LT |
1562 | } |
1563 | ||
9d6a15c3 DB |
1564 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
1565 | { | |
1566 | return __sys_socket(family, type, protocol); | |
1567 | } | |
1568 | ||
1da177e4 LT |
1569 | /* |
1570 | * Create a pair of connected sockets. | |
1571 | */ | |
1572 | ||
6debc8d8 | 1573 | int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) |
1da177e4 LT |
1574 | { |
1575 | struct socket *sock1, *sock2; | |
1576 | int fd1, fd2, err; | |
db349509 | 1577 | struct file *newfile1, *newfile2; |
a677a039 UD |
1578 | int flags; |
1579 | ||
1580 | flags = type & ~SOCK_TYPE_MASK; | |
77d27200 | 1581 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1582 | return -EINVAL; |
1583 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1584 | |
aaca0bdc UD |
1585 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1586 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1587 | ||
016a266b AV |
1588 | /* |
1589 | * reserve descriptors and make sure we won't fail | |
1590 | * to return them to userland. | |
1591 | */ | |
1592 | fd1 = get_unused_fd_flags(flags); | |
1593 | if (unlikely(fd1 < 0)) | |
1594 | return fd1; | |
1595 | ||
1596 | fd2 = get_unused_fd_flags(flags); | |
1597 | if (unlikely(fd2 < 0)) { | |
1598 | put_unused_fd(fd1); | |
1599 | return fd2; | |
1600 | } | |
1601 | ||
1602 | err = put_user(fd1, &usockvec[0]); | |
1603 | if (err) | |
1604 | goto out; | |
1605 | ||
1606 | err = put_user(fd2, &usockvec[1]); | |
1607 | if (err) | |
1608 | goto out; | |
1609 | ||
1da177e4 LT |
1610 | /* |
1611 | * Obtain the first socket and check if the underlying protocol | |
1612 | * supports the socketpair call. | |
1613 | */ | |
1614 | ||
1615 | err = sock_create(family, type, protocol, &sock1); | |
016a266b | 1616 | if (unlikely(err < 0)) |
1da177e4 LT |
1617 | goto out; |
1618 | ||
1619 | err = sock_create(family, type, protocol, &sock2); | |
016a266b AV |
1620 | if (unlikely(err < 0)) { |
1621 | sock_release(sock1); | |
1622 | goto out; | |
bf3c23d1 | 1623 | } |
d73aa286 | 1624 | |
d47cd945 DH |
1625 | err = security_socket_socketpair(sock1, sock2); |
1626 | if (unlikely(err)) { | |
1627 | sock_release(sock2); | |
1628 | sock_release(sock1); | |
1629 | goto out; | |
1630 | } | |
1631 | ||
016a266b AV |
1632 | err = sock1->ops->socketpair(sock1, sock2); |
1633 | if (unlikely(err < 0)) { | |
1634 | sock_release(sock2); | |
1635 | sock_release(sock1); | |
1636 | goto out; | |
28407630 AV |
1637 | } |
1638 | ||
aab174f0 | 1639 | newfile1 = sock_alloc_file(sock1, flags, NULL); |
b5ffe634 | 1640 | if (IS_ERR(newfile1)) { |
28407630 | 1641 | err = PTR_ERR(newfile1); |
016a266b AV |
1642 | sock_release(sock2); |
1643 | goto out; | |
28407630 AV |
1644 | } |
1645 | ||
aab174f0 | 1646 | newfile2 = sock_alloc_file(sock2, flags, NULL); |
28407630 AV |
1647 | if (IS_ERR(newfile2)) { |
1648 | err = PTR_ERR(newfile2); | |
016a266b AV |
1649 | fput(newfile1); |
1650 | goto out; | |
db349509 AV |
1651 | } |
1652 | ||
157cf649 | 1653 | audit_fd_pair(fd1, fd2); |
d73aa286 | 1654 | |
db349509 AV |
1655 | fd_install(fd1, newfile1); |
1656 | fd_install(fd2, newfile2); | |
d73aa286 | 1657 | return 0; |
1da177e4 | 1658 | |
016a266b | 1659 | out: |
d73aa286 | 1660 | put_unused_fd(fd2); |
d73aa286 | 1661 | put_unused_fd(fd1); |
1da177e4 LT |
1662 | return err; |
1663 | } | |
1664 | ||
6debc8d8 DB |
1665 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
1666 | int __user *, usockvec) | |
1667 | { | |
1668 | return __sys_socketpair(family, type, protocol, usockvec); | |
1669 | } | |
1670 | ||
1da177e4 LT |
1671 | /* |
1672 | * Bind a name to a socket. Nothing much to do here since it's | |
1673 | * the protocol's responsibility to handle the local address. | |
1674 | * | |
1675 | * We move the socket address to kernel space before we call | |
1676 | * the protocol layer (having also checked the address is ok). | |
1677 | */ | |
1678 | ||
a87d35d8 | 1679 | int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
1da177e4 LT |
1680 | { |
1681 | struct socket *sock; | |
230b1839 | 1682 | struct sockaddr_storage address; |
6cb153ca | 1683 | int err, fput_needed; |
1da177e4 | 1684 | |
89bddce5 | 1685 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1686 | if (sock) { |
43db362d | 1687 | err = move_addr_to_kernel(umyaddr, addrlen, &address); |
068b88cc | 1688 | if (!err) { |
89bddce5 | 1689 | err = security_socket_bind(sock, |
230b1839 | 1690 | (struct sockaddr *)&address, |
89bddce5 | 1691 | addrlen); |
6cb153ca BL |
1692 | if (!err) |
1693 | err = sock->ops->bind(sock, | |
89bddce5 | 1694 | (struct sockaddr *) |
230b1839 | 1695 | &address, addrlen); |
1da177e4 | 1696 | } |
6cb153ca | 1697 | fput_light(sock->file, fput_needed); |
89bddce5 | 1698 | } |
1da177e4 LT |
1699 | return err; |
1700 | } | |
1701 | ||
a87d35d8 DB |
1702 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
1703 | { | |
1704 | return __sys_bind(fd, umyaddr, addrlen); | |
1705 | } | |
1706 | ||
1da177e4 LT |
1707 | /* |
1708 | * Perform a listen. Basically, we allow the protocol to do anything | |
1709 | * necessary for a listen, and if that works, we mark the socket as | |
1710 | * ready for listening. | |
1711 | */ | |
1712 | ||
25e290ee | 1713 | int __sys_listen(int fd, int backlog) |
1da177e4 LT |
1714 | { |
1715 | struct socket *sock; | |
6cb153ca | 1716 | int err, fput_needed; |
b8e1f9b5 | 1717 | int somaxconn; |
89bddce5 SH |
1718 | |
1719 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1720 | if (sock) { | |
8efa6e93 | 1721 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; |
95c96174 | 1722 | if ((unsigned int)backlog > somaxconn) |
b8e1f9b5 | 1723 | backlog = somaxconn; |
1da177e4 LT |
1724 | |
1725 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1726 | if (!err) |
1727 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1728 | |
6cb153ca | 1729 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1730 | } |
1731 | return err; | |
1732 | } | |
1733 | ||
25e290ee DB |
1734 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
1735 | { | |
1736 | return __sys_listen(fd, backlog); | |
1737 | } | |
1738 | ||
d32f89da | 1739 | struct file *do_accept(struct file *file, unsigned file_flags, |
de2ea4b6 | 1740 | struct sockaddr __user *upeer_sockaddr, |
d32f89da | 1741 | int __user *upeer_addrlen, int flags) |
1da177e4 LT |
1742 | { |
1743 | struct socket *sock, *newsock; | |
39d8c1b6 | 1744 | struct file *newfile; |
d32f89da | 1745 | int err, len; |
230b1839 | 1746 | struct sockaddr_storage address; |
1da177e4 | 1747 | |
dba4a925 | 1748 | sock = sock_from_file(file); |
d32f89da PB |
1749 | if (!sock) |
1750 | return ERR_PTR(-ENOTSOCK); | |
1da177e4 | 1751 | |
c6d409cf ED |
1752 | newsock = sock_alloc(); |
1753 | if (!newsock) | |
d32f89da | 1754 | return ERR_PTR(-ENFILE); |
1da177e4 LT |
1755 | |
1756 | newsock->type = sock->type; | |
1757 | newsock->ops = sock->ops; | |
1758 | ||
1da177e4 LT |
1759 | /* |
1760 | * We don't need try_module_get here, as the listening socket (sock) | |
1761 | * has the protocol module (sock->ops->owner) held. | |
1762 | */ | |
1763 | __module_get(newsock->ops->owner); | |
1764 | ||
aab174f0 | 1765 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); |
d32f89da PB |
1766 | if (IS_ERR(newfile)) |
1767 | return newfile; | |
39d8c1b6 | 1768 | |
a79af59e FF |
1769 | err = security_socket_accept(sock, newsock); |
1770 | if (err) | |
39d8c1b6 | 1771 | goto out_fd; |
a79af59e | 1772 | |
de2ea4b6 JA |
1773 | err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags, |
1774 | false); | |
1da177e4 | 1775 | if (err < 0) |
39d8c1b6 | 1776 | goto out_fd; |
1da177e4 LT |
1777 | |
1778 | if (upeer_sockaddr) { | |
9b2c45d4 DV |
1779 | len = newsock->ops->getname(newsock, |
1780 | (struct sockaddr *)&address, 2); | |
1781 | if (len < 0) { | |
1da177e4 | 1782 | err = -ECONNABORTED; |
39d8c1b6 | 1783 | goto out_fd; |
1da177e4 | 1784 | } |
43db362d | 1785 | err = move_addr_to_user(&address, |
230b1839 | 1786 | len, upeer_sockaddr, upeer_addrlen); |
1da177e4 | 1787 | if (err < 0) |
39d8c1b6 | 1788 | goto out_fd; |
1da177e4 LT |
1789 | } |
1790 | ||
1791 | /* File flags are not inherited via accept() unlike another OSes. */ | |
d32f89da | 1792 | return newfile; |
39d8c1b6 | 1793 | out_fd: |
9606a216 | 1794 | fput(newfile); |
d32f89da PB |
1795 | return ERR_PTR(err); |
1796 | } | |
1797 | ||
1798 | int __sys_accept4_file(struct file *file, unsigned file_flags, | |
1799 | struct sockaddr __user *upeer_sockaddr, | |
1800 | int __user *upeer_addrlen, int flags, | |
1801 | unsigned long nofile) | |
1802 | { | |
1803 | struct file *newfile; | |
1804 | int newfd; | |
1805 | ||
1806 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1807 | return -EINVAL; | |
1808 | ||
1809 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1810 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
de2ea4b6 | 1811 | |
d32f89da PB |
1812 | newfd = __get_unused_fd_flags(flags, nofile); |
1813 | if (unlikely(newfd < 0)) | |
1814 | return newfd; | |
1815 | ||
1816 | newfile = do_accept(file, file_flags, upeer_sockaddr, upeer_addrlen, | |
1817 | flags); | |
1818 | if (IS_ERR(newfile)) { | |
1819 | put_unused_fd(newfd); | |
1820 | return PTR_ERR(newfile); | |
1821 | } | |
1822 | fd_install(newfd, newfile); | |
1823 | return newfd; | |
de2ea4b6 JA |
1824 | } |
1825 | ||
1826 | /* | |
1827 | * For accept, we attempt to create a new socket, set up the link | |
1828 | * with the client, wake up the client, then return the new | |
1829 | * connected fd. We collect the address of the connector in kernel | |
1830 | * space and move it to user at the very end. This is unclean because | |
1831 | * we open the socket then return an error. | |
1832 | * | |
1833 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1834 | * status to recvmsg. We need to add that support in a way thats | |
1835 | * clean when we restructure accept also. | |
1836 | */ | |
1837 | ||
1838 | int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, | |
1839 | int __user *upeer_addrlen, int flags) | |
1840 | { | |
1841 | int ret = -EBADF; | |
1842 | struct fd f; | |
1843 | ||
1844 | f = fdget(fd); | |
1845 | if (f.file) { | |
1846 | ret = __sys_accept4_file(f.file, 0, upeer_sockaddr, | |
09952e3e JA |
1847 | upeer_addrlen, flags, |
1848 | rlimit(RLIMIT_NOFILE)); | |
6b07edeb | 1849 | fdput(f); |
de2ea4b6 JA |
1850 | } |
1851 | ||
1852 | return ret; | |
1da177e4 LT |
1853 | } |
1854 | ||
4541e805 DB |
1855 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1856 | int __user *, upeer_addrlen, int, flags) | |
1857 | { | |
1858 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); | |
1859 | } | |
1860 | ||
20f37034 HC |
1861 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1862 | int __user *, upeer_addrlen) | |
aaca0bdc | 1863 | { |
4541e805 | 1864 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
aaca0bdc UD |
1865 | } |
1866 | ||
1da177e4 LT |
1867 | /* |
1868 | * Attempt to connect to a socket with the server address. The address | |
1869 | * is in user space so we verify it is OK and move it to kernel space. | |
1870 | * | |
1871 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1872 | * break bindings | |
1873 | * | |
1874 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1875 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1876 | * include the -EINPROGRESS status for such sockets. | |
1877 | */ | |
1878 | ||
f499a021 | 1879 | int __sys_connect_file(struct file *file, struct sockaddr_storage *address, |
bd3ded31 | 1880 | int addrlen, int file_flags) |
1da177e4 LT |
1881 | { |
1882 | struct socket *sock; | |
bd3ded31 | 1883 | int err; |
1da177e4 | 1884 | |
dba4a925 FR |
1885 | sock = sock_from_file(file); |
1886 | if (!sock) { | |
1887 | err = -ENOTSOCK; | |
1da177e4 | 1888 | goto out; |
dba4a925 | 1889 | } |
1da177e4 | 1890 | |
89bddce5 | 1891 | err = |
f499a021 | 1892 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); |
1da177e4 | 1893 | if (err) |
bd3ded31 | 1894 | goto out; |
1da177e4 | 1895 | |
f499a021 | 1896 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
bd3ded31 | 1897 | sock->file->f_flags | file_flags); |
1da177e4 LT |
1898 | out: |
1899 | return err; | |
1900 | } | |
1901 | ||
bd3ded31 JA |
1902 | int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) |
1903 | { | |
1904 | int ret = -EBADF; | |
1905 | struct fd f; | |
1906 | ||
1907 | f = fdget(fd); | |
1908 | if (f.file) { | |
f499a021 JA |
1909 | struct sockaddr_storage address; |
1910 | ||
1911 | ret = move_addr_to_kernel(uservaddr, addrlen, &address); | |
1912 | if (!ret) | |
1913 | ret = __sys_connect_file(f.file, &address, addrlen, 0); | |
6b07edeb | 1914 | fdput(f); |
bd3ded31 JA |
1915 | } |
1916 | ||
1917 | return ret; | |
1918 | } | |
1919 | ||
1387c2c2 DB |
1920 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
1921 | int, addrlen) | |
1922 | { | |
1923 | return __sys_connect(fd, uservaddr, addrlen); | |
1924 | } | |
1925 | ||
1da177e4 LT |
1926 | /* |
1927 | * Get the local address ('name') of a socket object. Move the obtained | |
1928 | * name to user space. | |
1929 | */ | |
1930 | ||
8882a107 DB |
1931 | int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
1932 | int __user *usockaddr_len) | |
1da177e4 LT |
1933 | { |
1934 | struct socket *sock; | |
230b1839 | 1935 | struct sockaddr_storage address; |
9b2c45d4 | 1936 | int err, fput_needed; |
89bddce5 | 1937 | |
6cb153ca | 1938 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
1939 | if (!sock) |
1940 | goto out; | |
1941 | ||
1942 | err = security_socket_getsockname(sock); | |
1943 | if (err) | |
1944 | goto out_put; | |
1945 | ||
9b2c45d4 DV |
1946 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); |
1947 | if (err < 0) | |
1da177e4 | 1948 | goto out_put; |
9b2c45d4 DV |
1949 | /* "err" is actually length in this case */ |
1950 | err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); | |
1da177e4 LT |
1951 | |
1952 | out_put: | |
6cb153ca | 1953 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1954 | out: |
1955 | return err; | |
1956 | } | |
1957 | ||
8882a107 DB |
1958 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
1959 | int __user *, usockaddr_len) | |
1960 | { | |
1961 | return __sys_getsockname(fd, usockaddr, usockaddr_len); | |
1962 | } | |
1963 | ||
1da177e4 LT |
1964 | /* |
1965 | * Get the remote address ('name') of a socket object. Move the obtained | |
1966 | * name to user space. | |
1967 | */ | |
1968 | ||
b21c8f83 DB |
1969 | int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
1970 | int __user *usockaddr_len) | |
1da177e4 LT |
1971 | { |
1972 | struct socket *sock; | |
230b1839 | 1973 | struct sockaddr_storage address; |
9b2c45d4 | 1974 | int err, fput_needed; |
1da177e4 | 1975 | |
89bddce5 SH |
1976 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1977 | if (sock != NULL) { | |
1da177e4 LT |
1978 | err = security_socket_getpeername(sock); |
1979 | if (err) { | |
6cb153ca | 1980 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1981 | return err; |
1982 | } | |
1983 | ||
9b2c45d4 DV |
1984 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); |
1985 | if (err >= 0) | |
1986 | /* "err" is actually length in this case */ | |
1987 | err = move_addr_to_user(&address, err, usockaddr, | |
89bddce5 | 1988 | usockaddr_len); |
6cb153ca | 1989 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1990 | } |
1991 | return err; | |
1992 | } | |
1993 | ||
b21c8f83 DB |
1994 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
1995 | int __user *, usockaddr_len) | |
1996 | { | |
1997 | return __sys_getpeername(fd, usockaddr, usockaddr_len); | |
1998 | } | |
1999 | ||
1da177e4 LT |
2000 | /* |
2001 | * Send a datagram to a given address. We move the address into kernel | |
2002 | * space and check the user space data area is readable before invoking | |
2003 | * the protocol. | |
2004 | */ | |
211b634b DB |
2005 | int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, |
2006 | struct sockaddr __user *addr, int addr_len) | |
1da177e4 LT |
2007 | { |
2008 | struct socket *sock; | |
230b1839 | 2009 | struct sockaddr_storage address; |
1da177e4 LT |
2010 | int err; |
2011 | struct msghdr msg; | |
2012 | struct iovec iov; | |
6cb153ca | 2013 | int fput_needed; |
6cb153ca | 2014 | |
602bd0e9 AV |
2015 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); |
2016 | if (unlikely(err)) | |
2017 | return err; | |
de0fa95c PE |
2018 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2019 | if (!sock) | |
4387ff75 | 2020 | goto out; |
6cb153ca | 2021 | |
89bddce5 | 2022 | msg.msg_name = NULL; |
89bddce5 SH |
2023 | msg.msg_control = NULL; |
2024 | msg.msg_controllen = 0; | |
2025 | msg.msg_namelen = 0; | |
6cb153ca | 2026 | if (addr) { |
43db362d | 2027 | err = move_addr_to_kernel(addr, addr_len, &address); |
1da177e4 LT |
2028 | if (err < 0) |
2029 | goto out_put; | |
230b1839 | 2030 | msg.msg_name = (struct sockaddr *)&address; |
89bddce5 | 2031 | msg.msg_namelen = addr_len; |
1da177e4 LT |
2032 | } |
2033 | if (sock->file->f_flags & O_NONBLOCK) | |
2034 | flags |= MSG_DONTWAIT; | |
2035 | msg.msg_flags = flags; | |
d8725c86 | 2036 | err = sock_sendmsg(sock, &msg); |
1da177e4 | 2037 | |
89bddce5 | 2038 | out_put: |
de0fa95c | 2039 | fput_light(sock->file, fput_needed); |
4387ff75 | 2040 | out: |
1da177e4 LT |
2041 | return err; |
2042 | } | |
2043 | ||
211b634b DB |
2044 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
2045 | unsigned int, flags, struct sockaddr __user *, addr, | |
2046 | int, addr_len) | |
2047 | { | |
2048 | return __sys_sendto(fd, buff, len, flags, addr, addr_len); | |
2049 | } | |
2050 | ||
1da177e4 | 2051 | /* |
89bddce5 | 2052 | * Send a datagram down a socket. |
1da177e4 LT |
2053 | */ |
2054 | ||
3e0fa65f | 2055 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
95c96174 | 2056 | unsigned int, flags) |
1da177e4 | 2057 | { |
211b634b | 2058 | return __sys_sendto(fd, buff, len, flags, NULL, 0); |
1da177e4 LT |
2059 | } |
2060 | ||
2061 | /* | |
89bddce5 | 2062 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
2063 | * sender. We verify the buffers are writable and if needed move the |
2064 | * sender address from kernel to user space. | |
2065 | */ | |
7a09e1eb DB |
2066 | int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, |
2067 | struct sockaddr __user *addr, int __user *addr_len) | |
1da177e4 LT |
2068 | { |
2069 | struct socket *sock; | |
2070 | struct iovec iov; | |
2071 | struct msghdr msg; | |
230b1839 | 2072 | struct sockaddr_storage address; |
89bddce5 | 2073 | int err, err2; |
6cb153ca BL |
2074 | int fput_needed; |
2075 | ||
602bd0e9 AV |
2076 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); |
2077 | if (unlikely(err)) | |
2078 | return err; | |
de0fa95c | 2079 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 2080 | if (!sock) |
de0fa95c | 2081 | goto out; |
1da177e4 | 2082 | |
89bddce5 SH |
2083 | msg.msg_control = NULL; |
2084 | msg.msg_controllen = 0; | |
f3d33426 HFS |
2085 | /* Save some cycles and don't copy the address if not needed */ |
2086 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; | |
2087 | /* We assume all kernel code knows the size of sockaddr_storage */ | |
2088 | msg.msg_namelen = 0; | |
130ed5d1 | 2089 | msg.msg_iocb = NULL; |
9f138fa6 | 2090 | msg.msg_flags = 0; |
1da177e4 LT |
2091 | if (sock->file->f_flags & O_NONBLOCK) |
2092 | flags |= MSG_DONTWAIT; | |
2da62906 | 2093 | err = sock_recvmsg(sock, &msg, flags); |
1da177e4 | 2094 | |
89bddce5 | 2095 | if (err >= 0 && addr != NULL) { |
43db362d | 2096 | err2 = move_addr_to_user(&address, |
230b1839 | 2097 | msg.msg_namelen, addr, addr_len); |
89bddce5 SH |
2098 | if (err2 < 0) |
2099 | err = err2; | |
1da177e4 | 2100 | } |
de0fa95c PE |
2101 | |
2102 | fput_light(sock->file, fput_needed); | |
4387ff75 | 2103 | out: |
1da177e4 LT |
2104 | return err; |
2105 | } | |
2106 | ||
7a09e1eb DB |
2107 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
2108 | unsigned int, flags, struct sockaddr __user *, addr, | |
2109 | int __user *, addr_len) | |
2110 | { | |
2111 | return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); | |
2112 | } | |
2113 | ||
1da177e4 | 2114 | /* |
89bddce5 | 2115 | * Receive a datagram from a socket. |
1da177e4 LT |
2116 | */ |
2117 | ||
b7c0ddf5 JG |
2118 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, |
2119 | unsigned int, flags) | |
1da177e4 | 2120 | { |
7a09e1eb | 2121 | return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1da177e4 LT |
2122 | } |
2123 | ||
83f0c10b FW |
2124 | static bool sock_use_custom_sol_socket(const struct socket *sock) |
2125 | { | |
2126 | const struct sock *sk = sock->sk; | |
2127 | ||
2128 | /* Use sock->ops->setsockopt() for MPTCP */ | |
2129 | return IS_ENABLED(CONFIG_MPTCP) && | |
2130 | sk->sk_protocol == IPPROTO_MPTCP && | |
2131 | sk->sk_type == SOCK_STREAM && | |
2132 | (sk->sk_family == AF_INET || sk->sk_family == AF_INET6); | |
2133 | } | |
2134 | ||
1da177e4 LT |
2135 | /* |
2136 | * Set a socket option. Because we don't know the option lengths we have | |
2137 | * to pass the user mode parameter for the protocols to sort out. | |
2138 | */ | |
a7b75c5a | 2139 | int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval, |
55db9c0e | 2140 | int optlen) |
1da177e4 | 2141 | { |
519a8a6c | 2142 | sockptr_t optval = USER_SOCKPTR(user_optval); |
0d01da6a | 2143 | char *kernel_optval = NULL; |
6cb153ca | 2144 | int err, fput_needed; |
1da177e4 LT |
2145 | struct socket *sock; |
2146 | ||
2147 | if (optlen < 0) | |
2148 | return -EINVAL; | |
89bddce5 SH |
2149 | |
2150 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
4a367299 CH |
2151 | if (!sock) |
2152 | return err; | |
1da177e4 | 2153 | |
4a367299 CH |
2154 | err = security_socket_setsockopt(sock, level, optname); |
2155 | if (err) | |
2156 | goto out_put; | |
0d01da6a | 2157 | |
55db9c0e CH |
2158 | if (!in_compat_syscall()) |
2159 | err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname, | |
a7b75c5a | 2160 | user_optval, &optlen, |
55db9c0e | 2161 | &kernel_optval); |
4a367299 CH |
2162 | if (err < 0) |
2163 | goto out_put; | |
2164 | if (err > 0) { | |
2165 | err = 0; | |
2166 | goto out_put; | |
2167 | } | |
0d01da6a | 2168 | |
a7b75c5a CH |
2169 | if (kernel_optval) |
2170 | optval = KERNEL_SOCKPTR(kernel_optval); | |
4a367299 | 2171 | if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock)) |
a7b75c5a | 2172 | err = sock_setsockopt(sock, level, optname, optval, optlen); |
a44d9e72 CH |
2173 | else if (unlikely(!sock->ops->setsockopt)) |
2174 | err = -EOPNOTSUPP; | |
4a367299 CH |
2175 | else |
2176 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
89bddce5 | 2177 | optlen); |
a7b75c5a | 2178 | kfree(kernel_optval); |
4a367299 CH |
2179 | out_put: |
2180 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2181 | return err; |
2182 | } | |
2183 | ||
cc36dca0 DB |
2184 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
2185 | char __user *, optval, int, optlen) | |
2186 | { | |
2187 | return __sys_setsockopt(fd, level, optname, optval, optlen); | |
2188 | } | |
2189 | ||
9cacf81f SF |
2190 | INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level, |
2191 | int optname)); | |
2192 | ||
1da177e4 LT |
2193 | /* |
2194 | * Get a socket option. Because we don't know the option lengths we have | |
2195 | * to pass a user mode parameter for the protocols to sort out. | |
2196 | */ | |
55db9c0e CH |
2197 | int __sys_getsockopt(int fd, int level, int optname, char __user *optval, |
2198 | int __user *optlen) | |
1da177e4 | 2199 | { |
6cb153ca | 2200 | int err, fput_needed; |
1da177e4 | 2201 | struct socket *sock; |
0d01da6a | 2202 | int max_optlen; |
1da177e4 | 2203 | |
89bddce5 | 2204 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
d8a9b38f CH |
2205 | if (!sock) |
2206 | return err; | |
2207 | ||
2208 | err = security_socket_getsockopt(sock, level, optname); | |
2209 | if (err) | |
2210 | goto out_put; | |
1da177e4 | 2211 | |
55db9c0e CH |
2212 | if (!in_compat_syscall()) |
2213 | max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); | |
0d01da6a | 2214 | |
d8a9b38f CH |
2215 | if (level == SOL_SOCKET) |
2216 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
a44d9e72 CH |
2217 | else if (unlikely(!sock->ops->getsockopt)) |
2218 | err = -EOPNOTSUPP; | |
d8a9b38f CH |
2219 | else |
2220 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
89bddce5 | 2221 | optlen); |
0d01da6a | 2222 | |
55db9c0e CH |
2223 | if (!in_compat_syscall()) |
2224 | err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, | |
2225 | optval, optlen, max_optlen, | |
2226 | err); | |
6cb153ca | 2227 | out_put: |
d8a9b38f | 2228 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2229 | return err; |
2230 | } | |
2231 | ||
13a2d70e DB |
2232 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
2233 | char __user *, optval, int __user *, optlen) | |
2234 | { | |
2235 | return __sys_getsockopt(fd, level, optname, optval, optlen); | |
2236 | } | |
2237 | ||
1da177e4 LT |
2238 | /* |
2239 | * Shutdown a socket. | |
2240 | */ | |
2241 | ||
b713c195 JA |
2242 | int __sys_shutdown_sock(struct socket *sock, int how) |
2243 | { | |
2244 | int err; | |
2245 | ||
2246 | err = security_socket_shutdown(sock, how); | |
2247 | if (!err) | |
2248 | err = sock->ops->shutdown(sock, how); | |
2249 | ||
2250 | return err; | |
2251 | } | |
2252 | ||
005a1aea | 2253 | int __sys_shutdown(int fd, int how) |
1da177e4 | 2254 | { |
6cb153ca | 2255 | int err, fput_needed; |
1da177e4 LT |
2256 | struct socket *sock; |
2257 | ||
89bddce5 SH |
2258 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2259 | if (sock != NULL) { | |
b713c195 | 2260 | err = __sys_shutdown_sock(sock, how); |
6cb153ca | 2261 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2262 | } |
2263 | return err; | |
2264 | } | |
2265 | ||
005a1aea DB |
2266 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
2267 | { | |
2268 | return __sys_shutdown(fd, how); | |
2269 | } | |
2270 | ||
89bddce5 | 2271 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
2272 | * fields which are the same type (int / unsigned) on our platforms. |
2273 | */ | |
2274 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
2275 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
2276 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
2277 | ||
c71d8ebe TH |
2278 | struct used_address { |
2279 | struct sockaddr_storage name; | |
2280 | unsigned int name_len; | |
2281 | }; | |
2282 | ||
0a384abf JA |
2283 | int __copy_msghdr_from_user(struct msghdr *kmsg, |
2284 | struct user_msghdr __user *umsg, | |
2285 | struct sockaddr __user **save_addr, | |
2286 | struct iovec __user **uiov, size_t *nsegs) | |
1661bf36 | 2287 | { |
ffb07550 | 2288 | struct user_msghdr msg; |
08adb7da AV |
2289 | ssize_t err; |
2290 | ||
ffb07550 | 2291 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) |
1661bf36 | 2292 | return -EFAULT; |
dbb490b9 | 2293 | |
1f466e1f CH |
2294 | kmsg->msg_control_is_user = true; |
2295 | kmsg->msg_control_user = msg.msg_control; | |
ffb07550 AV |
2296 | kmsg->msg_controllen = msg.msg_controllen; |
2297 | kmsg->msg_flags = msg.msg_flags; | |
2298 | ||
2299 | kmsg->msg_namelen = msg.msg_namelen; | |
2300 | if (!msg.msg_name) | |
6a2a2b3a AS |
2301 | kmsg->msg_namelen = 0; |
2302 | ||
dbb490b9 ML |
2303 | if (kmsg->msg_namelen < 0) |
2304 | return -EINVAL; | |
2305 | ||
1661bf36 | 2306 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
db31c55a | 2307 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); |
08adb7da AV |
2308 | |
2309 | if (save_addr) | |
ffb07550 | 2310 | *save_addr = msg.msg_name; |
08adb7da | 2311 | |
ffb07550 | 2312 | if (msg.msg_name && kmsg->msg_namelen) { |
08adb7da | 2313 | if (!save_addr) { |
864d9664 PA |
2314 | err = move_addr_to_kernel(msg.msg_name, |
2315 | kmsg->msg_namelen, | |
08adb7da AV |
2316 | kmsg->msg_name); |
2317 | if (err < 0) | |
2318 | return err; | |
2319 | } | |
2320 | } else { | |
2321 | kmsg->msg_name = NULL; | |
2322 | kmsg->msg_namelen = 0; | |
2323 | } | |
2324 | ||
ffb07550 | 2325 | if (msg.msg_iovlen > UIO_MAXIOV) |
08adb7da AV |
2326 | return -EMSGSIZE; |
2327 | ||
0345f931 | 2328 | kmsg->msg_iocb = NULL; |
0a384abf JA |
2329 | *uiov = msg.msg_iov; |
2330 | *nsegs = msg.msg_iovlen; | |
2331 | return 0; | |
2332 | } | |
2333 | ||
2334 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
2335 | struct user_msghdr __user *umsg, | |
2336 | struct sockaddr __user **save_addr, | |
2337 | struct iovec **iov) | |
2338 | { | |
2339 | struct user_msghdr msg; | |
2340 | ssize_t err; | |
2341 | ||
2342 | err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov, | |
2343 | &msg.msg_iovlen); | |
2344 | if (err) | |
2345 | return err; | |
0345f931 | 2346 | |
87e5e6da | 2347 | err = import_iovec(save_addr ? READ : WRITE, |
ffb07550 | 2348 | msg.msg_iov, msg.msg_iovlen, |
da184284 | 2349 | UIO_FASTIOV, iov, &kmsg->msg_iter); |
87e5e6da | 2350 | return err < 0 ? err : 0; |
1661bf36 DC |
2351 | } |
2352 | ||
4257c8ca JA |
2353 | static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys, |
2354 | unsigned int flags, struct used_address *used_address, | |
2355 | unsigned int allowed_msghdr_flags) | |
1da177e4 | 2356 | { |
b9d717a7 | 2357 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
846cc123 | 2358 | __aligned(sizeof(__kernel_size_t)); |
89bddce5 | 2359 | /* 20 is size of ipv6_pktinfo */ |
1da177e4 | 2360 | unsigned char *ctl_buf = ctl; |
d8725c86 | 2361 | int ctl_len; |
08adb7da | 2362 | ssize_t err; |
89bddce5 | 2363 | |
1da177e4 LT |
2364 | err = -ENOBUFS; |
2365 | ||
228e548e | 2366 | if (msg_sys->msg_controllen > INT_MAX) |
4257c8ca | 2367 | goto out; |
28a94d8f | 2368 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); |
228e548e | 2369 | ctl_len = msg_sys->msg_controllen; |
1da177e4 | 2370 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 | 2371 | err = |
228e548e | 2372 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
89bddce5 | 2373 | sizeof(ctl)); |
1da177e4 | 2374 | if (err) |
4257c8ca | 2375 | goto out; |
228e548e AB |
2376 | ctl_buf = msg_sys->msg_control; |
2377 | ctl_len = msg_sys->msg_controllen; | |
1da177e4 | 2378 | } else if (ctl_len) { |
ac4340fc DM |
2379 | BUILD_BUG_ON(sizeof(struct cmsghdr) != |
2380 | CMSG_ALIGN(sizeof(struct cmsghdr))); | |
89bddce5 | 2381 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 2382 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 2383 | if (ctl_buf == NULL) |
4257c8ca | 2384 | goto out; |
1da177e4 LT |
2385 | } |
2386 | err = -EFAULT; | |
1f466e1f | 2387 | if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len)) |
1da177e4 | 2388 | goto out_freectl; |
228e548e | 2389 | msg_sys->msg_control = ctl_buf; |
1f466e1f | 2390 | msg_sys->msg_control_is_user = false; |
1da177e4 | 2391 | } |
228e548e | 2392 | msg_sys->msg_flags = flags; |
1da177e4 LT |
2393 | |
2394 | if (sock->file->f_flags & O_NONBLOCK) | |
228e548e | 2395 | msg_sys->msg_flags |= MSG_DONTWAIT; |
c71d8ebe TH |
2396 | /* |
2397 | * If this is sendmmsg() and current destination address is same as | |
2398 | * previously succeeded address, omit asking LSM's decision. | |
2399 | * used_address->name_len is initialized to UINT_MAX so that the first | |
2400 | * destination address never matches. | |
2401 | */ | |
bc909d9d MD |
2402 | if (used_address && msg_sys->msg_name && |
2403 | used_address->name_len == msg_sys->msg_namelen && | |
2404 | !memcmp(&used_address->name, msg_sys->msg_name, | |
c71d8ebe | 2405 | used_address->name_len)) { |
d8725c86 | 2406 | err = sock_sendmsg_nosec(sock, msg_sys); |
c71d8ebe TH |
2407 | goto out_freectl; |
2408 | } | |
d8725c86 | 2409 | err = sock_sendmsg(sock, msg_sys); |
c71d8ebe TH |
2410 | /* |
2411 | * If this is sendmmsg() and sending to current destination address was | |
2412 | * successful, remember it. | |
2413 | */ | |
2414 | if (used_address && err >= 0) { | |
2415 | used_address->name_len = msg_sys->msg_namelen; | |
bc909d9d MD |
2416 | if (msg_sys->msg_name) |
2417 | memcpy(&used_address->name, msg_sys->msg_name, | |
2418 | used_address->name_len); | |
c71d8ebe | 2419 | } |
1da177e4 LT |
2420 | |
2421 | out_freectl: | |
89bddce5 | 2422 | if (ctl_buf != ctl) |
1da177e4 | 2423 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
4257c8ca JA |
2424 | out: |
2425 | return err; | |
2426 | } | |
2427 | ||
03b1230c JA |
2428 | int sendmsg_copy_msghdr(struct msghdr *msg, |
2429 | struct user_msghdr __user *umsg, unsigned flags, | |
2430 | struct iovec **iov) | |
4257c8ca JA |
2431 | { |
2432 | int err; | |
2433 | ||
2434 | if (flags & MSG_CMSG_COMPAT) { | |
2435 | struct compat_msghdr __user *msg_compat; | |
2436 | ||
2437 | msg_compat = (struct compat_msghdr __user *) umsg; | |
2438 | err = get_compat_msghdr(msg, msg_compat, NULL, iov); | |
2439 | } else { | |
2440 | err = copy_msghdr_from_user(msg, umsg, NULL, iov); | |
2441 | } | |
2442 | if (err < 0) | |
2443 | return err; | |
2444 | ||
2445 | return 0; | |
2446 | } | |
2447 | ||
2448 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2449 | struct msghdr *msg_sys, unsigned int flags, | |
2450 | struct used_address *used_address, | |
2451 | unsigned int allowed_msghdr_flags) | |
2452 | { | |
2453 | struct sockaddr_storage address; | |
2454 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2455 | ssize_t err; | |
2456 | ||
2457 | msg_sys->msg_name = &address; | |
2458 | ||
2459 | err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov); | |
2460 | if (err < 0) | |
2461 | return err; | |
2462 | ||
2463 | err = ____sys_sendmsg(sock, msg_sys, flags, used_address, | |
2464 | allowed_msghdr_flags); | |
da184284 | 2465 | kfree(iov); |
228e548e AB |
2466 | return err; |
2467 | } | |
2468 | ||
2469 | /* | |
2470 | * BSD sendmsg interface | |
2471 | */ | |
03b1230c | 2472 | long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg, |
0fa03c62 JA |
2473 | unsigned int flags) |
2474 | { | |
03b1230c | 2475 | return ____sys_sendmsg(sock, msg, flags, NULL, 0); |
0fa03c62 | 2476 | } |
228e548e | 2477 | |
e1834a32 DB |
2478 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2479 | bool forbid_cmsg_compat) | |
228e548e AB |
2480 | { |
2481 | int fput_needed, err; | |
2482 | struct msghdr msg_sys; | |
1be374a0 AL |
2483 | struct socket *sock; |
2484 | ||
e1834a32 DB |
2485 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2486 | return -EINVAL; | |
2487 | ||
1be374a0 | 2488 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
228e548e AB |
2489 | if (!sock) |
2490 | goto out; | |
2491 | ||
28a94d8f | 2492 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); |
228e548e | 2493 | |
6cb153ca | 2494 | fput_light(sock->file, fput_needed); |
89bddce5 | 2495 | out: |
1da177e4 LT |
2496 | return err; |
2497 | } | |
2498 | ||
666547ff | 2499 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) |
a7526eb5 | 2500 | { |
e1834a32 | 2501 | return __sys_sendmsg(fd, msg, flags, true); |
a7526eb5 AL |
2502 | } |
2503 | ||
228e548e AB |
2504 | /* |
2505 | * Linux sendmmsg interface | |
2506 | */ | |
2507 | ||
2508 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
e1834a32 | 2509 | unsigned int flags, bool forbid_cmsg_compat) |
228e548e AB |
2510 | { |
2511 | int fput_needed, err, datagrams; | |
2512 | struct socket *sock; | |
2513 | struct mmsghdr __user *entry; | |
2514 | struct compat_mmsghdr __user *compat_entry; | |
2515 | struct msghdr msg_sys; | |
c71d8ebe | 2516 | struct used_address used_address; |
f092276d | 2517 | unsigned int oflags = flags; |
228e548e | 2518 | |
e1834a32 DB |
2519 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2520 | return -EINVAL; | |
2521 | ||
98382f41 AB |
2522 | if (vlen > UIO_MAXIOV) |
2523 | vlen = UIO_MAXIOV; | |
228e548e AB |
2524 | |
2525 | datagrams = 0; | |
2526 | ||
2527 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2528 | if (!sock) | |
2529 | return err; | |
2530 | ||
c71d8ebe | 2531 | used_address.name_len = UINT_MAX; |
228e548e AB |
2532 | entry = mmsg; |
2533 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
728ffb86 | 2534 | err = 0; |
f092276d | 2535 | flags |= MSG_BATCH; |
228e548e AB |
2536 | |
2537 | while (datagrams < vlen) { | |
f092276d TH |
2538 | if (datagrams == vlen - 1) |
2539 | flags = oflags; | |
2540 | ||
228e548e | 2541 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2542 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, |
28a94d8f | 2543 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2544 | if (err < 0) |
2545 | break; | |
2546 | err = __put_user(err, &compat_entry->msg_len); | |
2547 | ++compat_entry; | |
2548 | } else { | |
a7526eb5 | 2549 | err = ___sys_sendmsg(sock, |
666547ff | 2550 | (struct user_msghdr __user *)entry, |
28a94d8f | 2551 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2552 | if (err < 0) |
2553 | break; | |
2554 | err = put_user(err, &entry->msg_len); | |
2555 | ++entry; | |
2556 | } | |
2557 | ||
2558 | if (err) | |
2559 | break; | |
2560 | ++datagrams; | |
3023898b SHY |
2561 | if (msg_data_left(&msg_sys)) |
2562 | break; | |
a78cb84c | 2563 | cond_resched(); |
228e548e AB |
2564 | } |
2565 | ||
228e548e AB |
2566 | fput_light(sock->file, fput_needed); |
2567 | ||
728ffb86 AB |
2568 | /* We only return an error if no datagrams were able to be sent */ |
2569 | if (datagrams != 0) | |
228e548e AB |
2570 | return datagrams; |
2571 | ||
228e548e AB |
2572 | return err; |
2573 | } | |
2574 | ||
2575 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2576 | unsigned int, vlen, unsigned int, flags) | |
2577 | { | |
e1834a32 | 2578 | return __sys_sendmmsg(fd, mmsg, vlen, flags, true); |
228e548e AB |
2579 | } |
2580 | ||
03b1230c JA |
2581 | int recvmsg_copy_msghdr(struct msghdr *msg, |
2582 | struct user_msghdr __user *umsg, unsigned flags, | |
2583 | struct sockaddr __user **uaddr, | |
2584 | struct iovec **iov) | |
1da177e4 | 2585 | { |
08adb7da | 2586 | ssize_t err; |
1da177e4 | 2587 | |
4257c8ca JA |
2588 | if (MSG_CMSG_COMPAT & flags) { |
2589 | struct compat_msghdr __user *msg_compat; | |
1da177e4 | 2590 | |
4257c8ca JA |
2591 | msg_compat = (struct compat_msghdr __user *) umsg; |
2592 | err = get_compat_msghdr(msg, msg_compat, uaddr, iov); | |
2593 | } else { | |
2594 | err = copy_msghdr_from_user(msg, umsg, uaddr, iov); | |
2595 | } | |
1da177e4 | 2596 | if (err < 0) |
da184284 | 2597 | return err; |
1da177e4 | 2598 | |
4257c8ca JA |
2599 | return 0; |
2600 | } | |
2601 | ||
2602 | static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys, | |
2603 | struct user_msghdr __user *msg, | |
2604 | struct sockaddr __user *uaddr, | |
2605 | unsigned int flags, int nosec) | |
2606 | { | |
2607 | struct compat_msghdr __user *msg_compat = | |
2608 | (struct compat_msghdr __user *) msg; | |
2609 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2610 | struct sockaddr_storage addr; | |
2611 | unsigned long cmsg_ptr; | |
2612 | int len; | |
2613 | ssize_t err; | |
2614 | ||
2615 | msg_sys->msg_name = &addr; | |
a2e27255 ACM |
2616 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
2617 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
89bddce5 | 2618 | |
f3d33426 HFS |
2619 | /* We assume all kernel code knows the size of sockaddr_storage */ |
2620 | msg_sys->msg_namelen = 0; | |
2621 | ||
1da177e4 LT |
2622 | if (sock->file->f_flags & O_NONBLOCK) |
2623 | flags |= MSG_DONTWAIT; | |
1af66221 ED |
2624 | |
2625 | if (unlikely(nosec)) | |
2626 | err = sock_recvmsg_nosec(sock, msg_sys, flags); | |
2627 | else | |
2628 | err = sock_recvmsg(sock, msg_sys, flags); | |
2629 | ||
1da177e4 | 2630 | if (err < 0) |
4257c8ca | 2631 | goto out; |
1da177e4 LT |
2632 | len = err; |
2633 | ||
2634 | if (uaddr != NULL) { | |
43db362d | 2635 | err = move_addr_to_user(&addr, |
a2e27255 | 2636 | msg_sys->msg_namelen, uaddr, |
89bddce5 | 2637 | uaddr_len); |
1da177e4 | 2638 | if (err < 0) |
4257c8ca | 2639 | goto out; |
1da177e4 | 2640 | } |
a2e27255 | 2641 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
37f7f421 | 2642 | COMPAT_FLAGS(msg)); |
1da177e4 | 2643 | if (err) |
4257c8ca | 2644 | goto out; |
1da177e4 | 2645 | if (MSG_CMSG_COMPAT & flags) |
a2e27255 | 2646 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2647 | &msg_compat->msg_controllen); |
2648 | else | |
a2e27255 | 2649 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2650 | &msg->msg_controllen); |
2651 | if (err) | |
4257c8ca | 2652 | goto out; |
1da177e4 | 2653 | err = len; |
4257c8ca JA |
2654 | out: |
2655 | return err; | |
2656 | } | |
2657 | ||
2658 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2659 | struct msghdr *msg_sys, unsigned int flags, int nosec) | |
2660 | { | |
2661 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2662 | /* user mode address pointers */ | |
2663 | struct sockaddr __user *uaddr; | |
2664 | ssize_t err; | |
2665 | ||
2666 | err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov); | |
2667 | if (err < 0) | |
2668 | return err; | |
1da177e4 | 2669 | |
4257c8ca | 2670 | err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec); |
da184284 | 2671 | kfree(iov); |
a2e27255 ACM |
2672 | return err; |
2673 | } | |
2674 | ||
2675 | /* | |
2676 | * BSD recvmsg interface | |
2677 | */ | |
2678 | ||
03b1230c JA |
2679 | long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg, |
2680 | struct user_msghdr __user *umsg, | |
2681 | struct sockaddr __user *uaddr, unsigned int flags) | |
aa1fa28f | 2682 | { |
03b1230c | 2683 | return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0); |
aa1fa28f JA |
2684 | } |
2685 | ||
e1834a32 DB |
2686 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2687 | bool forbid_cmsg_compat) | |
a2e27255 ACM |
2688 | { |
2689 | int fput_needed, err; | |
2690 | struct msghdr msg_sys; | |
1be374a0 AL |
2691 | struct socket *sock; |
2692 | ||
e1834a32 DB |
2693 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2694 | return -EINVAL; | |
2695 | ||
1be374a0 | 2696 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
a2e27255 ACM |
2697 | if (!sock) |
2698 | goto out; | |
2699 | ||
a7526eb5 | 2700 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
a2e27255 | 2701 | |
6cb153ca | 2702 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2703 | out: |
2704 | return err; | |
2705 | } | |
2706 | ||
666547ff | 2707 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, |
a7526eb5 AL |
2708 | unsigned int, flags) |
2709 | { | |
e1834a32 | 2710 | return __sys_recvmsg(fd, msg, flags, true); |
a7526eb5 AL |
2711 | } |
2712 | ||
a2e27255 ACM |
2713 | /* |
2714 | * Linux recvmmsg interface | |
2715 | */ | |
2716 | ||
e11d4284 AB |
2717 | static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2718 | unsigned int vlen, unsigned int flags, | |
2719 | struct timespec64 *timeout) | |
a2e27255 ACM |
2720 | { |
2721 | int fput_needed, err, datagrams; | |
2722 | struct socket *sock; | |
2723 | struct mmsghdr __user *entry; | |
d7256d0e | 2724 | struct compat_mmsghdr __user *compat_entry; |
a2e27255 | 2725 | struct msghdr msg_sys; |
766b9f92 DD |
2726 | struct timespec64 end_time; |
2727 | struct timespec64 timeout64; | |
a2e27255 ACM |
2728 | |
2729 | if (timeout && | |
2730 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2731 | timeout->tv_nsec)) | |
2732 | return -EINVAL; | |
2733 | ||
2734 | datagrams = 0; | |
2735 | ||
2736 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2737 | if (!sock) | |
2738 | return err; | |
2739 | ||
7797dc41 SHY |
2740 | if (likely(!(flags & MSG_ERRQUEUE))) { |
2741 | err = sock_error(sock->sk); | |
2742 | if (err) { | |
2743 | datagrams = err; | |
2744 | goto out_put; | |
2745 | } | |
e623a9e9 | 2746 | } |
a2e27255 ACM |
2747 | |
2748 | entry = mmsg; | |
d7256d0e | 2749 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
a2e27255 ACM |
2750 | |
2751 | while (datagrams < vlen) { | |
2752 | /* | |
2753 | * No need to ask LSM for more than the first datagram. | |
2754 | */ | |
d7256d0e | 2755 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2756 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, |
a7526eb5 AL |
2757 | &msg_sys, flags & ~MSG_WAITFORONE, |
2758 | datagrams); | |
d7256d0e JMG |
2759 | if (err < 0) |
2760 | break; | |
2761 | err = __put_user(err, &compat_entry->msg_len); | |
2762 | ++compat_entry; | |
2763 | } else { | |
a7526eb5 | 2764 | err = ___sys_recvmsg(sock, |
666547ff | 2765 | (struct user_msghdr __user *)entry, |
a7526eb5 AL |
2766 | &msg_sys, flags & ~MSG_WAITFORONE, |
2767 | datagrams); | |
d7256d0e JMG |
2768 | if (err < 0) |
2769 | break; | |
2770 | err = put_user(err, &entry->msg_len); | |
2771 | ++entry; | |
2772 | } | |
2773 | ||
a2e27255 ACM |
2774 | if (err) |
2775 | break; | |
a2e27255 ACM |
2776 | ++datagrams; |
2777 | ||
71c5c159 BB |
2778 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
2779 | if (flags & MSG_WAITFORONE) | |
2780 | flags |= MSG_DONTWAIT; | |
2781 | ||
a2e27255 | 2782 | if (timeout) { |
766b9f92 | 2783 | ktime_get_ts64(&timeout64); |
c2e6c856 | 2784 | *timeout = timespec64_sub(end_time, timeout64); |
a2e27255 ACM |
2785 | if (timeout->tv_sec < 0) { |
2786 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2787 | break; | |
2788 | } | |
2789 | ||
2790 | /* Timeout, return less than vlen datagrams */ | |
2791 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2792 | break; | |
2793 | } | |
2794 | ||
2795 | /* Out of band data, return right away */ | |
2796 | if (msg_sys.msg_flags & MSG_OOB) | |
2797 | break; | |
a78cb84c | 2798 | cond_resched(); |
a2e27255 ACM |
2799 | } |
2800 | ||
a2e27255 | 2801 | if (err == 0) |
34b88a68 ACM |
2802 | goto out_put; |
2803 | ||
2804 | if (datagrams == 0) { | |
2805 | datagrams = err; | |
2806 | goto out_put; | |
2807 | } | |
a2e27255 | 2808 | |
34b88a68 ACM |
2809 | /* |
2810 | * We may return less entries than requested (vlen) if the | |
2811 | * sock is non block and there aren't enough datagrams... | |
2812 | */ | |
2813 | if (err != -EAGAIN) { | |
a2e27255 | 2814 | /* |
34b88a68 ACM |
2815 | * ... or if recvmsg returns an error after we |
2816 | * received some datagrams, where we record the | |
2817 | * error to return on the next call or if the | |
2818 | * app asks about it using getsockopt(SO_ERROR). | |
a2e27255 | 2819 | */ |
34b88a68 | 2820 | sock->sk->sk_err = -err; |
a2e27255 | 2821 | } |
34b88a68 ACM |
2822 | out_put: |
2823 | fput_light(sock->file, fput_needed); | |
a2e27255 | 2824 | |
34b88a68 | 2825 | return datagrams; |
a2e27255 ACM |
2826 | } |
2827 | ||
e11d4284 AB |
2828 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2829 | unsigned int vlen, unsigned int flags, | |
2830 | struct __kernel_timespec __user *timeout, | |
2831 | struct old_timespec32 __user *timeout32) | |
a2e27255 ACM |
2832 | { |
2833 | int datagrams; | |
c2e6c856 | 2834 | struct timespec64 timeout_sys; |
a2e27255 | 2835 | |
e11d4284 AB |
2836 | if (timeout && get_timespec64(&timeout_sys, timeout)) |
2837 | return -EFAULT; | |
a2e27255 | 2838 | |
e11d4284 | 2839 | if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) |
a2e27255 ACM |
2840 | return -EFAULT; |
2841 | ||
e11d4284 AB |
2842 | if (!timeout && !timeout32) |
2843 | return do_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2844 | ||
2845 | datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
a2e27255 | 2846 | |
e11d4284 AB |
2847 | if (datagrams <= 0) |
2848 | return datagrams; | |
2849 | ||
2850 | if (timeout && put_timespec64(&timeout_sys, timeout)) | |
2851 | datagrams = -EFAULT; | |
2852 | ||
2853 | if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) | |
a2e27255 ACM |
2854 | datagrams = -EFAULT; |
2855 | ||
2856 | return datagrams; | |
2857 | } | |
2858 | ||
1255e269 DB |
2859 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2860 | unsigned int, vlen, unsigned int, flags, | |
c2e6c856 | 2861 | struct __kernel_timespec __user *, timeout) |
1255e269 | 2862 | { |
e11d4284 AB |
2863 | if (flags & MSG_CMSG_COMPAT) |
2864 | return -EINVAL; | |
2865 | ||
2866 | return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); | |
2867 | } | |
2868 | ||
2869 | #ifdef CONFIG_COMPAT_32BIT_TIME | |
2870 | SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, | |
2871 | unsigned int, vlen, unsigned int, flags, | |
2872 | struct old_timespec32 __user *, timeout) | |
2873 | { | |
2874 | if (flags & MSG_CMSG_COMPAT) | |
2875 | return -EINVAL; | |
2876 | ||
2877 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); | |
1255e269 | 2878 | } |
e11d4284 | 2879 | #endif |
1255e269 | 2880 | |
a2e27255 | 2881 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
1da177e4 LT |
2882 | /* Argument list sizes for sys_socketcall */ |
2883 | #define AL(x) ((x) * sizeof(unsigned long)) | |
228e548e | 2884 | static const unsigned char nargs[21] = { |
c6d409cf ED |
2885 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
2886 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2887 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
228e548e | 2888 | AL(4), AL(5), AL(4) |
89bddce5 SH |
2889 | }; |
2890 | ||
1da177e4 LT |
2891 | #undef AL |
2892 | ||
2893 | /* | |
89bddce5 | 2894 | * System call vectors. |
1da177e4 LT |
2895 | * |
2896 | * Argument checking cleaned up. Saved 20% in size. | |
2897 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 2898 | * it is set by the callees. |
1da177e4 LT |
2899 | */ |
2900 | ||
3e0fa65f | 2901 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
1da177e4 | 2902 | { |
2950fa9d | 2903 | unsigned long a[AUDITSC_ARGS]; |
89bddce5 | 2904 | unsigned long a0, a1; |
1da177e4 | 2905 | int err; |
47379052 | 2906 | unsigned int len; |
1da177e4 | 2907 | |
228e548e | 2908 | if (call < 1 || call > SYS_SENDMMSG) |
1da177e4 | 2909 | return -EINVAL; |
c8e8cd57 | 2910 | call = array_index_nospec(call, SYS_SENDMMSG + 1); |
1da177e4 | 2911 | |
47379052 AV |
2912 | len = nargs[call]; |
2913 | if (len > sizeof(a)) | |
2914 | return -EINVAL; | |
2915 | ||
1da177e4 | 2916 | /* copy_from_user should be SMP safe. */ |
47379052 | 2917 | if (copy_from_user(a, args, len)) |
1da177e4 | 2918 | return -EFAULT; |
3ec3b2fb | 2919 | |
2950fa9d CG |
2920 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
2921 | if (err) | |
2922 | return err; | |
3ec3b2fb | 2923 | |
89bddce5 SH |
2924 | a0 = a[0]; |
2925 | a1 = a[1]; | |
2926 | ||
2927 | switch (call) { | |
2928 | case SYS_SOCKET: | |
9d6a15c3 | 2929 | err = __sys_socket(a0, a1, a[2]); |
89bddce5 SH |
2930 | break; |
2931 | case SYS_BIND: | |
a87d35d8 | 2932 | err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
2933 | break; |
2934 | case SYS_CONNECT: | |
1387c2c2 | 2935 | err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
2936 | break; |
2937 | case SYS_LISTEN: | |
25e290ee | 2938 | err = __sys_listen(a0, a1); |
89bddce5 SH |
2939 | break; |
2940 | case SYS_ACCEPT: | |
4541e805 DB |
2941 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
2942 | (int __user *)a[2], 0); | |
89bddce5 SH |
2943 | break; |
2944 | case SYS_GETSOCKNAME: | |
2945 | err = | |
8882a107 DB |
2946 | __sys_getsockname(a0, (struct sockaddr __user *)a1, |
2947 | (int __user *)a[2]); | |
89bddce5 SH |
2948 | break; |
2949 | case SYS_GETPEERNAME: | |
2950 | err = | |
b21c8f83 DB |
2951 | __sys_getpeername(a0, (struct sockaddr __user *)a1, |
2952 | (int __user *)a[2]); | |
89bddce5 SH |
2953 | break; |
2954 | case SYS_SOCKETPAIR: | |
6debc8d8 | 2955 | err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
89bddce5 SH |
2956 | break; |
2957 | case SYS_SEND: | |
f3bf896b DB |
2958 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2959 | NULL, 0); | |
89bddce5 SH |
2960 | break; |
2961 | case SYS_SENDTO: | |
211b634b DB |
2962 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
2963 | (struct sockaddr __user *)a[4], a[5]); | |
89bddce5 SH |
2964 | break; |
2965 | case SYS_RECV: | |
d27e9afc DB |
2966 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2967 | NULL, NULL); | |
89bddce5 SH |
2968 | break; |
2969 | case SYS_RECVFROM: | |
7a09e1eb DB |
2970 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
2971 | (struct sockaddr __user *)a[4], | |
2972 | (int __user *)a[5]); | |
89bddce5 SH |
2973 | break; |
2974 | case SYS_SHUTDOWN: | |
005a1aea | 2975 | err = __sys_shutdown(a0, a1); |
89bddce5 SH |
2976 | break; |
2977 | case SYS_SETSOCKOPT: | |
cc36dca0 DB |
2978 | err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], |
2979 | a[4]); | |
89bddce5 SH |
2980 | break; |
2981 | case SYS_GETSOCKOPT: | |
2982 | err = | |
13a2d70e DB |
2983 | __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
2984 | (int __user *)a[4]); | |
89bddce5 SH |
2985 | break; |
2986 | case SYS_SENDMSG: | |
e1834a32 DB |
2987 | err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, |
2988 | a[2], true); | |
89bddce5 | 2989 | break; |
228e548e | 2990 | case SYS_SENDMMSG: |
e1834a32 DB |
2991 | err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], |
2992 | a[3], true); | |
228e548e | 2993 | break; |
89bddce5 | 2994 | case SYS_RECVMSG: |
e1834a32 DB |
2995 | err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, |
2996 | a[2], true); | |
89bddce5 | 2997 | break; |
a2e27255 | 2998 | case SYS_RECVMMSG: |
3ca47e95 | 2999 | if (IS_ENABLED(CONFIG_64BIT)) |
e11d4284 AB |
3000 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, |
3001 | a[2], a[3], | |
3002 | (struct __kernel_timespec __user *)a[4], | |
3003 | NULL); | |
3004 | else | |
3005 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, | |
3006 | a[2], a[3], NULL, | |
3007 | (struct old_timespec32 __user *)a[4]); | |
a2e27255 | 3008 | break; |
de11defe | 3009 | case SYS_ACCEPT4: |
4541e805 DB |
3010 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
3011 | (int __user *)a[2], a[3]); | |
aaca0bdc | 3012 | break; |
89bddce5 SH |
3013 | default: |
3014 | err = -EINVAL; | |
3015 | break; | |
1da177e4 LT |
3016 | } |
3017 | return err; | |
3018 | } | |
3019 | ||
89bddce5 | 3020 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 3021 | |
55737fda SH |
3022 | /** |
3023 | * sock_register - add a socket protocol handler | |
3024 | * @ops: description of protocol | |
3025 | * | |
1da177e4 LT |
3026 | * This function is called by a protocol handler that wants to |
3027 | * advertise its address family, and have it linked into the | |
e793c0f7 | 3028 | * socket interface. The value ops->family corresponds to the |
55737fda | 3029 | * socket system call protocol family. |
1da177e4 | 3030 | */ |
f0fd27d4 | 3031 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
3032 | { |
3033 | int err; | |
3034 | ||
3035 | if (ops->family >= NPROTO) { | |
3410f22e | 3036 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
1da177e4 LT |
3037 | return -ENOBUFS; |
3038 | } | |
55737fda SH |
3039 | |
3040 | spin_lock(&net_family_lock); | |
190683a9 ED |
3041 | if (rcu_dereference_protected(net_families[ops->family], |
3042 | lockdep_is_held(&net_family_lock))) | |
55737fda SH |
3043 | err = -EEXIST; |
3044 | else { | |
cf778b00 | 3045 | rcu_assign_pointer(net_families[ops->family], ops); |
1da177e4 LT |
3046 | err = 0; |
3047 | } | |
55737fda SH |
3048 | spin_unlock(&net_family_lock); |
3049 | ||
fe0bdbde | 3050 | pr_info("NET: Registered %s protocol family\n", pf_family_names[ops->family]); |
1da177e4 LT |
3051 | return err; |
3052 | } | |
c6d409cf | 3053 | EXPORT_SYMBOL(sock_register); |
1da177e4 | 3054 | |
55737fda SH |
3055 | /** |
3056 | * sock_unregister - remove a protocol handler | |
3057 | * @family: protocol family to remove | |
3058 | * | |
1da177e4 LT |
3059 | * This function is called by a protocol handler that wants to |
3060 | * remove its address family, and have it unlinked from the | |
55737fda SH |
3061 | * new socket creation. |
3062 | * | |
3063 | * If protocol handler is a module, then it can use module reference | |
3064 | * counts to protect against new references. If protocol handler is not | |
3065 | * a module then it needs to provide its own protection in | |
3066 | * the ops->create routine. | |
1da177e4 | 3067 | */ |
f0fd27d4 | 3068 | void sock_unregister(int family) |
1da177e4 | 3069 | { |
f0fd27d4 | 3070 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 3071 | |
55737fda | 3072 | spin_lock(&net_family_lock); |
a9b3cd7f | 3073 | RCU_INIT_POINTER(net_families[family], NULL); |
55737fda SH |
3074 | spin_unlock(&net_family_lock); |
3075 | ||
3076 | synchronize_rcu(); | |
3077 | ||
fe0bdbde | 3078 | pr_info("NET: Unregistered %s protocol family\n", pf_family_names[family]); |
1da177e4 | 3079 | } |
c6d409cf | 3080 | EXPORT_SYMBOL(sock_unregister); |
1da177e4 | 3081 | |
bf2ae2e4 XL |
3082 | bool sock_is_registered(int family) |
3083 | { | |
66b51b0a | 3084 | return family < NPROTO && rcu_access_pointer(net_families[family]); |
bf2ae2e4 XL |
3085 | } |
3086 | ||
77d76ea3 | 3087 | static int __init sock_init(void) |
1da177e4 | 3088 | { |
b3e19d92 | 3089 | int err; |
2ca794e5 EB |
3090 | /* |
3091 | * Initialize the network sysctl infrastructure. | |
3092 | */ | |
3093 | err = net_sysctl_init(); | |
3094 | if (err) | |
3095 | goto out; | |
b3e19d92 | 3096 | |
1da177e4 | 3097 | /* |
89bddce5 | 3098 | * Initialize skbuff SLAB cache |
1da177e4 LT |
3099 | */ |
3100 | skb_init(); | |
1da177e4 LT |
3101 | |
3102 | /* | |
89bddce5 | 3103 | * Initialize the protocols module. |
1da177e4 LT |
3104 | */ |
3105 | ||
3106 | init_inodecache(); | |
b3e19d92 NP |
3107 | |
3108 | err = register_filesystem(&sock_fs_type); | |
3109 | if (err) | |
47260ba9 | 3110 | goto out; |
1da177e4 | 3111 | sock_mnt = kern_mount(&sock_fs_type); |
b3e19d92 NP |
3112 | if (IS_ERR(sock_mnt)) { |
3113 | err = PTR_ERR(sock_mnt); | |
3114 | goto out_mount; | |
3115 | } | |
77d76ea3 AK |
3116 | |
3117 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
3118 | */ |
3119 | ||
3120 | #ifdef CONFIG_NETFILTER | |
6d11cfdb PNA |
3121 | err = netfilter_init(); |
3122 | if (err) | |
3123 | goto out; | |
1da177e4 | 3124 | #endif |
cbeb321a | 3125 | |
408eccce | 3126 | ptp_classifier_init(); |
c1f19b51 | 3127 | |
b3e19d92 NP |
3128 | out: |
3129 | return err; | |
3130 | ||
3131 | out_mount: | |
3132 | unregister_filesystem(&sock_fs_type); | |
b3e19d92 | 3133 | goto out; |
1da177e4 LT |
3134 | } |
3135 | ||
77d76ea3 AK |
3136 | core_initcall(sock_init); /* early initcall */ |
3137 | ||
1da177e4 LT |
3138 | #ifdef CONFIG_PROC_FS |
3139 | void socket_seq_show(struct seq_file *seq) | |
3140 | { | |
648845ab TZ |
3141 | seq_printf(seq, "sockets: used %d\n", |
3142 | sock_inuse_get(seq->private)); | |
1da177e4 | 3143 | } |
89bddce5 | 3144 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 3145 | |
29c49648 AB |
3146 | /* Handle the fact that while struct ifreq has the same *layout* on |
3147 | * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, | |
3148 | * which are handled elsewhere, it still has different *size* due to | |
3149 | * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, | |
3150 | * resulting in struct ifreq being 32 and 40 bytes respectively). | |
3151 | * As a result, if the struct happens to be at the end of a page and | |
3152 | * the next page isn't readable/writable, we get a fault. To prevent | |
3153 | * that, copy back and forth to the full size. | |
3154 | */ | |
3155 | int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg) | |
7a229387 | 3156 | { |
29c49648 AB |
3157 | if (in_compat_syscall()) { |
3158 | struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr; | |
7a229387 | 3159 | |
29c49648 AB |
3160 | memset(ifr, 0, sizeof(*ifr)); |
3161 | if (copy_from_user(ifr32, arg, sizeof(*ifr32))) | |
3162 | return -EFAULT; | |
7a229387 | 3163 | |
29c49648 AB |
3164 | if (ifrdata) |
3165 | *ifrdata = compat_ptr(ifr32->ifr_data); | |
7a229387 | 3166 | |
29c49648 AB |
3167 | return 0; |
3168 | } | |
7a229387 | 3169 | |
29c49648 | 3170 | if (copy_from_user(ifr, arg, sizeof(*ifr))) |
7a229387 AB |
3171 | return -EFAULT; |
3172 | ||
29c49648 AB |
3173 | if (ifrdata) |
3174 | *ifrdata = ifr->ifr_data; | |
3175 | ||
7a229387 AB |
3176 | return 0; |
3177 | } | |
29c49648 | 3178 | EXPORT_SYMBOL(get_user_ifreq); |
7a229387 | 3179 | |
29c49648 | 3180 | int put_user_ifreq(struct ifreq *ifr, void __user *arg) |
7a229387 | 3181 | { |
29c49648 | 3182 | size_t size = sizeof(*ifr); |
7a229387 | 3183 | |
29c49648 AB |
3184 | if (in_compat_syscall()) |
3185 | size = sizeof(struct compat_ifreq); | |
7a229387 | 3186 | |
29c49648 | 3187 | if (copy_to_user(arg, ifr, size)) |
7a229387 AB |
3188 | return -EFAULT; |
3189 | ||
3a7da39d | 3190 | return 0; |
7a229387 | 3191 | } |
29c49648 | 3192 | EXPORT_SYMBOL(put_user_ifreq); |
7a229387 | 3193 | |
89bbfc95 | 3194 | #ifdef CONFIG_COMPAT |
7a50a240 AB |
3195 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
3196 | { | |
7a50a240 | 3197 | compat_uptr_t uptr32; |
44c02a2c AV |
3198 | struct ifreq ifr; |
3199 | void __user *saved; | |
3200 | int err; | |
7a50a240 | 3201 | |
29c49648 | 3202 | if (get_user_ifreq(&ifr, NULL, uifr32)) |
7a50a240 AB |
3203 | return -EFAULT; |
3204 | ||
3205 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
3206 | return -EFAULT; | |
3207 | ||
44c02a2c AV |
3208 | saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; |
3209 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); | |
7a229387 | 3210 | |
a554bf96 | 3211 | err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL, NULL); |
44c02a2c AV |
3212 | if (!err) { |
3213 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; | |
29c49648 | 3214 | if (put_user_ifreq(&ifr, uifr32)) |
44c02a2c | 3215 | err = -EFAULT; |
ccbd6a5a | 3216 | } |
44c02a2c | 3217 | return err; |
7a229387 AB |
3218 | } |
3219 | ||
590d4693 BH |
3220 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ |
3221 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
6b96018b | 3222 | struct compat_ifreq __user *u_ifreq32) |
7a229387 | 3223 | { |
44c02a2c | 3224 | struct ifreq ifreq; |
a554bf96 | 3225 | void __user *data; |
7a229387 | 3226 | |
d0efb162 PC |
3227 | if (!is_socket_ioctl_cmd(cmd)) |
3228 | return -ENOTTY; | |
a554bf96 | 3229 | if (get_user_ifreq(&ifreq, &data, u_ifreq32)) |
7a229387 | 3230 | return -EFAULT; |
a554bf96 | 3231 | ifreq.ifr_data = data; |
7a229387 | 3232 | |
a554bf96 | 3233 | return dev_ioctl(net, cmd, &ifreq, data, NULL); |
a2116ed2 AB |
3234 | } |
3235 | ||
7a229387 AB |
3236 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE |
3237 | * for some operations; this forces use of the newer bridge-utils that | |
25985edc | 3238 | * use compatible ioctls |
7a229387 | 3239 | */ |
6b96018b | 3240 | static int old_bridge_ioctl(compat_ulong_t __user *argp) |
7a229387 | 3241 | { |
6b96018b | 3242 | compat_ulong_t tmp; |
7a229387 | 3243 | |
6b96018b | 3244 | if (get_user(tmp, argp)) |
7a229387 AB |
3245 | return -EFAULT; |
3246 | if (tmp == BRCTL_GET_VERSION) | |
3247 | return BRCTL_VERSION + 1; | |
3248 | return -EINVAL; | |
3249 | } | |
3250 | ||
6b96018b AB |
3251 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
3252 | unsigned int cmd, unsigned long arg) | |
3253 | { | |
3254 | void __user *argp = compat_ptr(arg); | |
3255 | struct sock *sk = sock->sk; | |
3256 | struct net *net = sock_net(sk); | |
7a229387 | 3257 | |
6b96018b | 3258 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
88fc023f | 3259 | return sock_ioctl(file, cmd, (unsigned long)argp); |
6b96018b AB |
3260 | |
3261 | switch (cmd) { | |
3262 | case SIOCSIFBR: | |
3263 | case SIOCGIFBR: | |
3264 | return old_bridge_ioctl(argp); | |
7a50a240 AB |
3265 | case SIOCWANDEV: |
3266 | return compat_siocwandev(net, argp); | |
0768e170 AB |
3267 | case SIOCGSTAMP_OLD: |
3268 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
3269 | if (!sock->ops->gettstamp) |
3270 | return -ENOIOCTLCMD; | |
0768e170 | 3271 | return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, |
c7cbdbf2 AB |
3272 | !COMPAT_USE_64BIT_TIME); |
3273 | ||
dd98d289 | 3274 | case SIOCETHTOOL: |
590d4693 BH |
3275 | case SIOCBONDSLAVEINFOQUERY: |
3276 | case SIOCBONDINFOQUERY: | |
a2116ed2 | 3277 | case SIOCSHWTSTAMP: |
fd468c74 | 3278 | case SIOCGHWTSTAMP: |
590d4693 | 3279 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3280 | |
3281 | case FIOSETOWN: | |
3282 | case SIOCSPGRP: | |
3283 | case FIOGETOWN: | |
3284 | case SIOCGPGRP: | |
3285 | case SIOCBRADDBR: | |
3286 | case SIOCBRDELBR: | |
3287 | case SIOCGIFVLAN: | |
3288 | case SIOCSIFVLAN: | |
c62cce2c | 3289 | case SIOCGSKNS: |
0768e170 AB |
3290 | case SIOCGSTAMP_NEW: |
3291 | case SIOCGSTAMPNS_NEW: | |
876f0bf9 | 3292 | case SIOCGIFCONF: |
6b96018b AB |
3293 | return sock_ioctl(file, cmd, arg); |
3294 | ||
3295 | case SIOCGIFFLAGS: | |
3296 | case SIOCSIFFLAGS: | |
709566d7 AB |
3297 | case SIOCGIFMAP: |
3298 | case SIOCSIFMAP: | |
6b96018b AB |
3299 | case SIOCGIFMETRIC: |
3300 | case SIOCSIFMETRIC: | |
3301 | case SIOCGIFMTU: | |
3302 | case SIOCSIFMTU: | |
3303 | case SIOCGIFMEM: | |
3304 | case SIOCSIFMEM: | |
3305 | case SIOCGIFHWADDR: | |
3306 | case SIOCSIFHWADDR: | |
3307 | case SIOCADDMULTI: | |
3308 | case SIOCDELMULTI: | |
3309 | case SIOCGIFINDEX: | |
6b96018b AB |
3310 | case SIOCGIFADDR: |
3311 | case SIOCSIFADDR: | |
3312 | case SIOCSIFHWBROADCAST: | |
6b96018b | 3313 | case SIOCDIFADDR: |
6b96018b AB |
3314 | case SIOCGIFBRDADDR: |
3315 | case SIOCSIFBRDADDR: | |
3316 | case SIOCGIFDSTADDR: | |
3317 | case SIOCSIFDSTADDR: | |
3318 | case SIOCGIFNETMASK: | |
3319 | case SIOCSIFNETMASK: | |
3320 | case SIOCSIFPFLAGS: | |
3321 | case SIOCGIFPFLAGS: | |
3322 | case SIOCGIFTXQLEN: | |
3323 | case SIOCSIFTXQLEN: | |
3324 | case SIOCBRADDIF: | |
3325 | case SIOCBRDELIF: | |
c6c9fee3 | 3326 | case SIOCGIFNAME: |
9177efd3 AB |
3327 | case SIOCSIFNAME: |
3328 | case SIOCGMIIPHY: | |
3329 | case SIOCGMIIREG: | |
3330 | case SIOCSMIIREG: | |
f92d4fc9 AV |
3331 | case SIOCBONDENSLAVE: |
3332 | case SIOCBONDRELEASE: | |
3333 | case SIOCBONDSETHWADDR: | |
3334 | case SIOCBONDCHANGEACTIVE: | |
6b96018b AB |
3335 | case SIOCSARP: |
3336 | case SIOCGARP: | |
3337 | case SIOCDARP: | |
c7dc504e | 3338 | case SIOCOUTQ: |
9d7bf41f | 3339 | case SIOCOUTQNSD: |
6b96018b | 3340 | case SIOCATMARK: |
63ff03ab | 3341 | return sock_do_ioctl(net, sock, cmd, arg); |
9177efd3 AB |
3342 | } |
3343 | ||
6b96018b AB |
3344 | return -ENOIOCTLCMD; |
3345 | } | |
7a229387 | 3346 | |
95c96174 | 3347 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, |
89bddce5 | 3348 | unsigned long arg) |
89bbfc95 SP |
3349 | { |
3350 | struct socket *sock = file->private_data; | |
3351 | int ret = -ENOIOCTLCMD; | |
87de87d5 DM |
3352 | struct sock *sk; |
3353 | struct net *net; | |
3354 | ||
3355 | sk = sock->sk; | |
3356 | net = sock_net(sk); | |
89bbfc95 SP |
3357 | |
3358 | if (sock->ops->compat_ioctl) | |
3359 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3360 | ||
87de87d5 DM |
3361 | if (ret == -ENOIOCTLCMD && |
3362 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3363 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3364 | ||
6b96018b AB |
3365 | if (ret == -ENOIOCTLCMD) |
3366 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3367 | ||
89bbfc95 SP |
3368 | return ret; |
3369 | } | |
3370 | #endif | |
3371 | ||
8a3c245c PT |
3372 | /** |
3373 | * kernel_bind - bind an address to a socket (kernel space) | |
3374 | * @sock: socket | |
3375 | * @addr: address | |
3376 | * @addrlen: length of address | |
3377 | * | |
3378 | * Returns 0 or an error. | |
3379 | */ | |
3380 | ||
ac5a488e SS |
3381 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
3382 | { | |
3383 | return sock->ops->bind(sock, addr, addrlen); | |
3384 | } | |
c6d409cf | 3385 | EXPORT_SYMBOL(kernel_bind); |
ac5a488e | 3386 | |
8a3c245c PT |
3387 | /** |
3388 | * kernel_listen - move socket to listening state (kernel space) | |
3389 | * @sock: socket | |
3390 | * @backlog: pending connections queue size | |
3391 | * | |
3392 | * Returns 0 or an error. | |
3393 | */ | |
3394 | ||
ac5a488e SS |
3395 | int kernel_listen(struct socket *sock, int backlog) |
3396 | { | |
3397 | return sock->ops->listen(sock, backlog); | |
3398 | } | |
c6d409cf | 3399 | EXPORT_SYMBOL(kernel_listen); |
ac5a488e | 3400 | |
8a3c245c PT |
3401 | /** |
3402 | * kernel_accept - accept a connection (kernel space) | |
3403 | * @sock: listening socket | |
3404 | * @newsock: new connected socket | |
3405 | * @flags: flags | |
3406 | * | |
3407 | * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. | |
3408 | * If it fails, @newsock is guaranteed to be %NULL. | |
3409 | * Returns 0 or an error. | |
3410 | */ | |
3411 | ||
ac5a488e SS |
3412 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
3413 | { | |
3414 | struct sock *sk = sock->sk; | |
3415 | int err; | |
3416 | ||
3417 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3418 | newsock); | |
3419 | if (err < 0) | |
3420 | goto done; | |
3421 | ||
cdfbabfb | 3422 | err = sock->ops->accept(sock, *newsock, flags, true); |
ac5a488e SS |
3423 | if (err < 0) { |
3424 | sock_release(*newsock); | |
fa8705b0 | 3425 | *newsock = NULL; |
ac5a488e SS |
3426 | goto done; |
3427 | } | |
3428 | ||
3429 | (*newsock)->ops = sock->ops; | |
1b08534e | 3430 | __module_get((*newsock)->ops->owner); |
ac5a488e SS |
3431 | |
3432 | done: | |
3433 | return err; | |
3434 | } | |
c6d409cf | 3435 | EXPORT_SYMBOL(kernel_accept); |
ac5a488e | 3436 | |
8a3c245c PT |
3437 | /** |
3438 | * kernel_connect - connect a socket (kernel space) | |
3439 | * @sock: socket | |
3440 | * @addr: address | |
3441 | * @addrlen: address length | |
3442 | * @flags: flags (O_NONBLOCK, ...) | |
3443 | * | |
f1dcffcc | 3444 | * For datagram sockets, @addr is the address to which datagrams are sent |
8a3c245c PT |
3445 | * by default, and the only address from which datagrams are received. |
3446 | * For stream sockets, attempts to connect to @addr. | |
3447 | * Returns 0 or an error code. | |
3448 | */ | |
3449 | ||
ac5a488e | 3450 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
4768fbcb | 3451 | int flags) |
ac5a488e SS |
3452 | { |
3453 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3454 | } | |
c6d409cf | 3455 | EXPORT_SYMBOL(kernel_connect); |
ac5a488e | 3456 | |
8a3c245c PT |
3457 | /** |
3458 | * kernel_getsockname - get the address which the socket is bound (kernel space) | |
3459 | * @sock: socket | |
3460 | * @addr: address holder | |
3461 | * | |
3462 | * Fills the @addr pointer with the address which the socket is bound. | |
3463 | * Returns 0 or an error code. | |
3464 | */ | |
3465 | ||
9b2c45d4 | 3466 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3467 | { |
9b2c45d4 | 3468 | return sock->ops->getname(sock, addr, 0); |
ac5a488e | 3469 | } |
c6d409cf | 3470 | EXPORT_SYMBOL(kernel_getsockname); |
ac5a488e | 3471 | |
8a3c245c | 3472 | /** |
645f0897 | 3473 | * kernel_getpeername - get the address which the socket is connected (kernel space) |
8a3c245c PT |
3474 | * @sock: socket |
3475 | * @addr: address holder | |
3476 | * | |
3477 | * Fills the @addr pointer with the address which the socket is connected. | |
3478 | * Returns 0 or an error code. | |
3479 | */ | |
3480 | ||
9b2c45d4 | 3481 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3482 | { |
9b2c45d4 | 3483 | return sock->ops->getname(sock, addr, 1); |
ac5a488e | 3484 | } |
c6d409cf | 3485 | EXPORT_SYMBOL(kernel_getpeername); |
ac5a488e | 3486 | |
8a3c245c PT |
3487 | /** |
3488 | * kernel_sendpage - send a &page through a socket (kernel space) | |
3489 | * @sock: socket | |
3490 | * @page: page | |
3491 | * @offset: page offset | |
3492 | * @size: total size in bytes | |
3493 | * @flags: flags (MSG_DONTWAIT, ...) | |
3494 | * | |
3495 | * Returns the total amount sent in bytes or an error. | |
3496 | */ | |
3497 | ||
ac5a488e SS |
3498 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
3499 | size_t size, int flags) | |
3500 | { | |
7b62d31d CL |
3501 | if (sock->ops->sendpage) { |
3502 | /* Warn in case the improper page to zero-copy send */ | |
3503 | WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send"); | |
ac5a488e | 3504 | return sock->ops->sendpage(sock, page, offset, size, flags); |
7b62d31d | 3505 | } |
ac5a488e SS |
3506 | return sock_no_sendpage(sock, page, offset, size, flags); |
3507 | } | |
c6d409cf | 3508 | EXPORT_SYMBOL(kernel_sendpage); |
ac5a488e | 3509 | |
8a3c245c PT |
3510 | /** |
3511 | * kernel_sendpage_locked - send a &page through the locked sock (kernel space) | |
3512 | * @sk: sock | |
3513 | * @page: page | |
3514 | * @offset: page offset | |
3515 | * @size: total size in bytes | |
3516 | * @flags: flags (MSG_DONTWAIT, ...) | |
3517 | * | |
3518 | * Returns the total amount sent in bytes or an error. | |
3519 | * Caller must hold @sk. | |
3520 | */ | |
3521 | ||
306b13eb TH |
3522 | int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, |
3523 | size_t size, int flags) | |
3524 | { | |
3525 | struct socket *sock = sk->sk_socket; | |
3526 | ||
3527 | if (sock->ops->sendpage_locked) | |
3528 | return sock->ops->sendpage_locked(sk, page, offset, size, | |
3529 | flags); | |
3530 | ||
3531 | return sock_no_sendpage_locked(sk, page, offset, size, flags); | |
3532 | } | |
3533 | EXPORT_SYMBOL(kernel_sendpage_locked); | |
3534 | ||
8a3c245c | 3535 | /** |
645f0897 | 3536 | * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space) |
8a3c245c PT |
3537 | * @sock: socket |
3538 | * @how: connection part | |
3539 | * | |
3540 | * Returns 0 or an error. | |
3541 | */ | |
3542 | ||
91cf45f0 TM |
3543 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
3544 | { | |
3545 | return sock->ops->shutdown(sock, how); | |
3546 | } | |
91cf45f0 | 3547 | EXPORT_SYMBOL(kernel_sock_shutdown); |
113c3075 | 3548 | |
8a3c245c PT |
3549 | /** |
3550 | * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket | |
3551 | * @sk: socket | |
3552 | * | |
3553 | * This routine returns the IP overhead imposed by a socket i.e. | |
3554 | * the length of the underlying IP header, depending on whether | |
3555 | * this is an IPv4 or IPv6 socket and the length from IP options turned | |
3556 | * on at the socket. Assumes that the caller has a lock on the socket. | |
113c3075 | 3557 | */ |
8a3c245c | 3558 | |
113c3075 P |
3559 | u32 kernel_sock_ip_overhead(struct sock *sk) |
3560 | { | |
3561 | struct inet_sock *inet; | |
3562 | struct ip_options_rcu *opt; | |
3563 | u32 overhead = 0; | |
113c3075 P |
3564 | #if IS_ENABLED(CONFIG_IPV6) |
3565 | struct ipv6_pinfo *np; | |
3566 | struct ipv6_txoptions *optv6 = NULL; | |
3567 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3568 | ||
3569 | if (!sk) | |
3570 | return overhead; | |
3571 | ||
113c3075 P |
3572 | switch (sk->sk_family) { |
3573 | case AF_INET: | |
3574 | inet = inet_sk(sk); | |
3575 | overhead += sizeof(struct iphdr); | |
3576 | opt = rcu_dereference_protected(inet->inet_opt, | |
614d79c0 | 3577 | sock_owned_by_user(sk)); |
113c3075 P |
3578 | if (opt) |
3579 | overhead += opt->opt.optlen; | |
3580 | return overhead; | |
3581 | #if IS_ENABLED(CONFIG_IPV6) | |
3582 | case AF_INET6: | |
3583 | np = inet6_sk(sk); | |
3584 | overhead += sizeof(struct ipv6hdr); | |
3585 | if (np) | |
3586 | optv6 = rcu_dereference_protected(np->opt, | |
614d79c0 | 3587 | sock_owned_by_user(sk)); |
113c3075 P |
3588 | if (optv6) |
3589 | overhead += (optv6->opt_flen + optv6->opt_nflen); | |
3590 | return overhead; | |
3591 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3592 | default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ | |
3593 | return overhead; | |
3594 | } | |
3595 | } | |
3596 | EXPORT_SYMBOL(kernel_sock_ip_overhead); |