Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * NET An implementation of the SOCKET network access protocol. | |
4 | * | |
5 | * Version: @(#)socket.c 1.1.93 18/02/95 | |
6 | * | |
7 | * Authors: Orest Zborowski, <obz@Kodak.COM> | |
02c30a84 | 8 | * Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * | |
11 | * Fixes: | |
12 | * Anonymous : NOTSOCK/BADF cleanup. Error fix in | |
13 | * shutdown() | |
14 | * Alan Cox : verify_area() fixes | |
15 | * Alan Cox : Removed DDI | |
16 | * Jonathan Kamens : SOCK_DGRAM reconnect bug | |
17 | * Alan Cox : Moved a load of checks to the very | |
18 | * top level. | |
19 | * Alan Cox : Move address structures to/from user | |
20 | * mode above the protocol layers. | |
21 | * Rob Janssen : Allow 0 length sends. | |
22 | * Alan Cox : Asynchronous I/O support (cribbed from the | |
23 | * tty drivers). | |
24 | * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) | |
25 | * Jeff Uphoff : Made max number of sockets command-line | |
26 | * configurable. | |
27 | * Matti Aarnio : Made the number of sockets dynamic, | |
28 | * to be allocated when needed, and mr. | |
29 | * Uphoff's max is used as max to be | |
30 | * allowed to allocate. | |
31 | * Linus : Argh. removed all the socket allocation | |
32 | * altogether: it's in the inode now. | |
33 | * Alan Cox : Made sock_alloc()/sock_release() public | |
34 | * for NetROM and future kernel nfsd type | |
35 | * stuff. | |
36 | * Alan Cox : sendmsg/recvmsg basics. | |
37 | * Tom Dyas : Export net symbols. | |
38 | * Marcin Dalecki : Fixed problems with CONFIG_NET="n". | |
39 | * Alan Cox : Added thread locking to sys_* calls | |
40 | * for sockets. May have errors at the | |
41 | * moment. | |
42 | * Kevin Buhr : Fixed the dumb errors in the above. | |
43 | * Andi Kleen : Some small cleanups, optimizations, | |
44 | * and fixed a copy_from_user() bug. | |
45 | * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) | |
89bddce5 | 46 | * Tigran Aivazian : Made listen(2) backlog sanity checks |
1da177e4 LT |
47 | * protocol-independent |
48 | * | |
1da177e4 | 49 | * This module is effectively the top level interface to the BSD socket |
89bddce5 | 50 | * paradigm. |
1da177e4 LT |
51 | * |
52 | * Based upon Swansea University Computer Society NET3.039 | |
53 | */ | |
54 | ||
aef2feda | 55 | #include <linux/bpf-cgroup.h> |
cc69837f | 56 | #include <linux/ethtool.h> |
1da177e4 | 57 | #include <linux/mm.h> |
1da177e4 LT |
58 | #include <linux/socket.h> |
59 | #include <linux/file.h> | |
2dc334f1 | 60 | #include <linux/splice.h> |
1da177e4 LT |
61 | #include <linux/net.h> |
62 | #include <linux/interrupt.h> | |
aaca0bdc | 63 | #include <linux/thread_info.h> |
55737fda | 64 | #include <linux/rcupdate.h> |
1da177e4 LT |
65 | #include <linux/netdevice.h> |
66 | #include <linux/proc_fs.h> | |
67 | #include <linux/seq_file.h> | |
4a3e2f71 | 68 | #include <linux/mutex.h> |
1da177e4 | 69 | #include <linux/if_bridge.h> |
20380731 | 70 | #include <linux/if_vlan.h> |
408eccce | 71 | #include <linux/ptp_classify.h> |
1da177e4 LT |
72 | #include <linux/init.h> |
73 | #include <linux/poll.h> | |
74 | #include <linux/cache.h> | |
75 | #include <linux/module.h> | |
76 | #include <linux/highmem.h> | |
1da177e4 | 77 | #include <linux/mount.h> |
fba9be49 | 78 | #include <linux/pseudo_fs.h> |
1da177e4 LT |
79 | #include <linux/security.h> |
80 | #include <linux/syscalls.h> | |
81 | #include <linux/compat.h> | |
82 | #include <linux/kmod.h> | |
3ec3b2fb | 83 | #include <linux/audit.h> |
d86b5e0e | 84 | #include <linux/wireless.h> |
1b8d7ae4 | 85 | #include <linux/nsproxy.h> |
1fd7317d | 86 | #include <linux/magic.h> |
5a0e3ad6 | 87 | #include <linux/slab.h> |
600e1779 | 88 | #include <linux/xattr.h> |
c8e8cd57 | 89 | #include <linux/nospec.h> |
8c3c447b | 90 | #include <linux/indirect_call_wrapper.h> |
8c9a6f54 | 91 | #include <linux/io_uring/net.h> |
1da177e4 | 92 | |
7c0f6ba6 | 93 | #include <linux/uaccess.h> |
1da177e4 LT |
94 | #include <asm/unistd.h> |
95 | ||
96 | #include <net/compat.h> | |
87de87d5 | 97 | #include <net/wext.h> |
f8451725 | 98 | #include <net/cls_cgroup.h> |
1da177e4 LT |
99 | |
100 | #include <net/sock.h> | |
101 | #include <linux/netfilter.h> | |
102 | ||
6b96018b AB |
103 | #include <linux/if_tun.h> |
104 | #include <linux/ipv6_route.h> | |
105 | #include <linux/route.h> | |
c7dc504e | 106 | #include <linux/termios.h> |
6b96018b | 107 | #include <linux/sockios.h> |
076bb0c8 | 108 | #include <net/busy_poll.h> |
f24b9be5 | 109 | #include <linux/errqueue.h> |
d7c08826 | 110 | #include <linux/ptp_clock_kernel.h> |
6e6eda44 | 111 | #include <trace/events/sock.h> |
06021292 | 112 | |
e0d1095a | 113 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 ET |
114 | unsigned int sysctl_net_busy_read __read_mostly; |
115 | unsigned int sysctl_net_busy_poll __read_mostly; | |
06021292 | 116 | #endif |
6b96018b | 117 | |
8ae5e030 AV |
118 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); |
119 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); | |
89bddce5 | 120 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
1da177e4 LT |
121 | |
122 | static int sock_close(struct inode *inode, struct file *file); | |
a11e1d43 LT |
123 | static __poll_t sock_poll(struct file *file, |
124 | struct poll_table_struct *wait); | |
89bddce5 | 125 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
89bbfc95 SP |
126 | #ifdef CONFIG_COMPAT |
127 | static long compat_sock_ioctl(struct file *file, | |
89bddce5 | 128 | unsigned int cmd, unsigned long arg); |
89bbfc95 | 129 | #endif |
1da177e4 | 130 | static int sock_fasync(int fd, struct file *filp, int on); |
9c55e01c | 131 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 132 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c | 133 | unsigned int flags); |
2bfc6685 | 134 | static void sock_splice_eof(struct file *file); |
542d3065 AB |
135 | |
136 | #ifdef CONFIG_PROC_FS | |
137 | static void sock_show_fdinfo(struct seq_file *m, struct file *f) | |
138 | { | |
139 | struct socket *sock = f->private_data; | |
1ded5e5a | 140 | const struct proto_ops *ops = READ_ONCE(sock->ops); |
542d3065 | 141 | |
1ded5e5a ED |
142 | if (ops->show_fdinfo) |
143 | ops->show_fdinfo(m, sock); | |
542d3065 AB |
144 | } |
145 | #else | |
146 | #define sock_show_fdinfo NULL | |
147 | #endif | |
1da177e4 | 148 | |
1da177e4 LT |
149 | /* |
150 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
151 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
152 | */ | |
153 | ||
da7071d7 | 154 | static const struct file_operations socket_file_ops = { |
1da177e4 LT |
155 | .owner = THIS_MODULE, |
156 | .llseek = no_llseek, | |
8ae5e030 AV |
157 | .read_iter = sock_read_iter, |
158 | .write_iter = sock_write_iter, | |
1da177e4 LT |
159 | .poll = sock_poll, |
160 | .unlocked_ioctl = sock_ioctl, | |
89bbfc95 SP |
161 | #ifdef CONFIG_COMPAT |
162 | .compat_ioctl = compat_sock_ioctl, | |
163 | #endif | |
8e9fad0e | 164 | .uring_cmd = io_uring_cmd_sock, |
1da177e4 | 165 | .mmap = sock_mmap, |
1da177e4 LT |
166 | .release = sock_close, |
167 | .fasync = sock_fasync, | |
2dc334f1 | 168 | .splice_write = splice_to_socket, |
9c55e01c | 169 | .splice_read = sock_splice_read, |
2bfc6685 | 170 | .splice_eof = sock_splice_eof, |
b4653342 | 171 | .show_fdinfo = sock_show_fdinfo, |
1da177e4 LT |
172 | }; |
173 | ||
fe0bdbde YD |
174 | static const char * const pf_family_names[] = { |
175 | [PF_UNSPEC] = "PF_UNSPEC", | |
176 | [PF_UNIX] = "PF_UNIX/PF_LOCAL", | |
177 | [PF_INET] = "PF_INET", | |
178 | [PF_AX25] = "PF_AX25", | |
179 | [PF_IPX] = "PF_IPX", | |
180 | [PF_APPLETALK] = "PF_APPLETALK", | |
181 | [PF_NETROM] = "PF_NETROM", | |
182 | [PF_BRIDGE] = "PF_BRIDGE", | |
183 | [PF_ATMPVC] = "PF_ATMPVC", | |
184 | [PF_X25] = "PF_X25", | |
185 | [PF_INET6] = "PF_INET6", | |
186 | [PF_ROSE] = "PF_ROSE", | |
187 | [PF_DECnet] = "PF_DECnet", | |
188 | [PF_NETBEUI] = "PF_NETBEUI", | |
189 | [PF_SECURITY] = "PF_SECURITY", | |
190 | [PF_KEY] = "PF_KEY", | |
191 | [PF_NETLINK] = "PF_NETLINK/PF_ROUTE", | |
192 | [PF_PACKET] = "PF_PACKET", | |
193 | [PF_ASH] = "PF_ASH", | |
194 | [PF_ECONET] = "PF_ECONET", | |
195 | [PF_ATMSVC] = "PF_ATMSVC", | |
196 | [PF_RDS] = "PF_RDS", | |
197 | [PF_SNA] = "PF_SNA", | |
198 | [PF_IRDA] = "PF_IRDA", | |
199 | [PF_PPPOX] = "PF_PPPOX", | |
200 | [PF_WANPIPE] = "PF_WANPIPE", | |
201 | [PF_LLC] = "PF_LLC", | |
202 | [PF_IB] = "PF_IB", | |
203 | [PF_MPLS] = "PF_MPLS", | |
204 | [PF_CAN] = "PF_CAN", | |
205 | [PF_TIPC] = "PF_TIPC", | |
206 | [PF_BLUETOOTH] = "PF_BLUETOOTH", | |
207 | [PF_IUCV] = "PF_IUCV", | |
208 | [PF_RXRPC] = "PF_RXRPC", | |
209 | [PF_ISDN] = "PF_ISDN", | |
210 | [PF_PHONET] = "PF_PHONET", | |
211 | [PF_IEEE802154] = "PF_IEEE802154", | |
212 | [PF_CAIF] = "PF_CAIF", | |
213 | [PF_ALG] = "PF_ALG", | |
214 | [PF_NFC] = "PF_NFC", | |
215 | [PF_VSOCK] = "PF_VSOCK", | |
216 | [PF_KCM] = "PF_KCM", | |
217 | [PF_QIPCRTR] = "PF_QIPCRTR", | |
218 | [PF_SMC] = "PF_SMC", | |
219 | [PF_XDP] = "PF_XDP", | |
bc49d816 | 220 | [PF_MCTP] = "PF_MCTP", |
fe0bdbde YD |
221 | }; |
222 | ||
1da177e4 LT |
223 | /* |
224 | * The protocol list. Each protocol is registered in here. | |
225 | */ | |
226 | ||
1da177e4 | 227 | static DEFINE_SPINLOCK(net_family_lock); |
190683a9 | 228 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; |
1da177e4 | 229 | |
1da177e4 | 230 | /* |
89bddce5 SH |
231 | * Support routines. |
232 | * Move socket addresses back and forth across the kernel/user | |
233 | * divide and look after the messy bits. | |
1da177e4 LT |
234 | */ |
235 | ||
1da177e4 LT |
236 | /** |
237 | * move_addr_to_kernel - copy a socket address into kernel space | |
238 | * @uaddr: Address in user space | |
239 | * @kaddr: Address in kernel space | |
240 | * @ulen: Length in user space | |
241 | * | |
242 | * The address is copied into kernel space. If the provided address is | |
243 | * too long an error code of -EINVAL is returned. If the copy gives | |
244 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
245 | */ | |
246 | ||
43db362d | 247 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) |
1da177e4 | 248 | { |
230b1839 | 249 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
1da177e4 | 250 | return -EINVAL; |
89bddce5 | 251 | if (ulen == 0) |
1da177e4 | 252 | return 0; |
89bddce5 | 253 | if (copy_from_user(kaddr, uaddr, ulen)) |
1da177e4 | 254 | return -EFAULT; |
3ec3b2fb | 255 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
256 | } |
257 | ||
258 | /** | |
259 | * move_addr_to_user - copy an address to user space | |
260 | * @kaddr: kernel space address | |
261 | * @klen: length of address in kernel | |
262 | * @uaddr: user space address | |
263 | * @ulen: pointer to user length field | |
264 | * | |
265 | * The value pointed to by ulen on entry is the buffer length available. | |
266 | * This is overwritten with the buffer space used. -EINVAL is returned | |
267 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
268 | * is returned if either the buffer or the length field are not | |
269 | * accessible. | |
270 | * After copying the data up to the limit the user specifies, the true | |
271 | * length of the data is written over the length limit the user | |
272 | * specified. Zero is returned for a success. | |
273 | */ | |
89bddce5 | 274 | |
43db362d | 275 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, |
11165f14 | 276 | void __user *uaddr, int __user *ulen) |
1da177e4 LT |
277 | { |
278 | int err; | |
279 | int len; | |
280 | ||
68c6beb3 | 281 | BUG_ON(klen > sizeof(struct sockaddr_storage)); |
89bddce5 SH |
282 | err = get_user(len, ulen); |
283 | if (err) | |
1da177e4 | 284 | return err; |
89bddce5 SH |
285 | if (len > klen) |
286 | len = klen; | |
68c6beb3 | 287 | if (len < 0) |
1da177e4 | 288 | return -EINVAL; |
89bddce5 | 289 | if (len) { |
d6fe3945 SG |
290 | if (audit_sockaddr(klen, kaddr)) |
291 | return -ENOMEM; | |
89bddce5 | 292 | if (copy_to_user(uaddr, kaddr, len)) |
1da177e4 LT |
293 | return -EFAULT; |
294 | } | |
295 | /* | |
89bddce5 SH |
296 | * "fromlen shall refer to the value before truncation.." |
297 | * 1003.1g | |
1da177e4 LT |
298 | */ |
299 | return __put_user(klen, ulen); | |
300 | } | |
301 | ||
08009a76 | 302 | static struct kmem_cache *sock_inode_cachep __ro_after_init; |
1da177e4 LT |
303 | |
304 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
305 | { | |
306 | struct socket_alloc *ei; | |
89bddce5 | 307 | |
fd60b288 | 308 | ei = alloc_inode_sb(sb, sock_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
309 | if (!ei) |
310 | return NULL; | |
333f7909 AV |
311 | init_waitqueue_head(&ei->socket.wq.wait); |
312 | ei->socket.wq.fasync_list = NULL; | |
313 | ei->socket.wq.flags = 0; | |
89bddce5 | 314 | |
1da177e4 LT |
315 | ei->socket.state = SS_UNCONNECTED; |
316 | ei->socket.flags = 0; | |
317 | ei->socket.ops = NULL; | |
318 | ei->socket.sk = NULL; | |
319 | ei->socket.file = NULL; | |
1da177e4 LT |
320 | |
321 | return &ei->vfs_inode; | |
322 | } | |
323 | ||
6d7855c5 | 324 | static void sock_free_inode(struct inode *inode) |
1da177e4 | 325 | { |
43815482 ED |
326 | struct socket_alloc *ei; |
327 | ||
328 | ei = container_of(inode, struct socket_alloc, vfs_inode); | |
43815482 | 329 | kmem_cache_free(sock_inode_cachep, ei); |
1da177e4 LT |
330 | } |
331 | ||
51cc5068 | 332 | static void init_once(void *foo) |
1da177e4 | 333 | { |
89bddce5 | 334 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
1da177e4 | 335 | |
a35afb83 | 336 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 337 | } |
89bddce5 | 338 | |
1e911632 | 339 | static void init_inodecache(void) |
1da177e4 LT |
340 | { |
341 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
89bddce5 SH |
342 | sizeof(struct socket_alloc), |
343 | 0, | |
344 | (SLAB_HWCACHE_ALIGN | | |
345 | SLAB_RECLAIM_ACCOUNT | | |
d4f01c5e | 346 | SLAB_ACCOUNT), |
20c2df83 | 347 | init_once); |
1e911632 | 348 | BUG_ON(sock_inode_cachep == NULL); |
1da177e4 LT |
349 | } |
350 | ||
b87221de | 351 | static const struct super_operations sockfs_ops = { |
c6d409cf | 352 | .alloc_inode = sock_alloc_inode, |
6d7855c5 | 353 | .free_inode = sock_free_inode, |
c6d409cf | 354 | .statfs = simple_statfs, |
1da177e4 LT |
355 | }; |
356 | ||
c23fbb6b ED |
357 | /* |
358 | * sockfs_dname() is called from d_path(). | |
359 | */ | |
360 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
361 | { | |
0f60d288 | 362 | return dynamic_dname(buffer, buflen, "socket:[%lu]", |
c5ef6035 | 363 | d_inode(dentry)->i_ino); |
c23fbb6b ED |
364 | } |
365 | ||
3ba13d17 | 366 | static const struct dentry_operations sockfs_dentry_operations = { |
c23fbb6b | 367 | .d_dname = sockfs_dname, |
1da177e4 LT |
368 | }; |
369 | ||
bba0bd31 AG |
370 | static int sockfs_xattr_get(const struct xattr_handler *handler, |
371 | struct dentry *dentry, struct inode *inode, | |
372 | const char *suffix, void *value, size_t size) | |
373 | { | |
374 | if (value) { | |
375 | if (dentry->d_name.len + 1 > size) | |
376 | return -ERANGE; | |
377 | memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); | |
378 | } | |
379 | return dentry->d_name.len + 1; | |
380 | } | |
381 | ||
382 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
383 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
384 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
385 | ||
386 | static const struct xattr_handler sockfs_xattr_handler = { | |
387 | .name = XATTR_NAME_SOCKPROTONAME, | |
388 | .get = sockfs_xattr_get, | |
389 | }; | |
390 | ||
4a590153 | 391 | static int sockfs_security_xattr_set(const struct xattr_handler *handler, |
39f60c1c | 392 | struct mnt_idmap *idmap, |
4a590153 AG |
393 | struct dentry *dentry, struct inode *inode, |
394 | const char *suffix, const void *value, | |
395 | size_t size, int flags) | |
396 | { | |
397 | /* Handled by LSM. */ | |
398 | return -EAGAIN; | |
399 | } | |
400 | ||
401 | static const struct xattr_handler sockfs_security_xattr_handler = { | |
402 | .prefix = XATTR_SECURITY_PREFIX, | |
403 | .set = sockfs_security_xattr_set, | |
404 | }; | |
405 | ||
295d3c44 | 406 | static const struct xattr_handler * const sockfs_xattr_handlers[] = { |
bba0bd31 | 407 | &sockfs_xattr_handler, |
4a590153 | 408 | &sockfs_security_xattr_handler, |
bba0bd31 AG |
409 | NULL |
410 | }; | |
411 | ||
fba9be49 | 412 | static int sockfs_init_fs_context(struct fs_context *fc) |
c74a1cbb | 413 | { |
fba9be49 DH |
414 | struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC); |
415 | if (!ctx) | |
416 | return -ENOMEM; | |
417 | ctx->ops = &sockfs_ops; | |
418 | ctx->dops = &sockfs_dentry_operations; | |
419 | ctx->xattr = sockfs_xattr_handlers; | |
420 | return 0; | |
c74a1cbb AV |
421 | } |
422 | ||
423 | static struct vfsmount *sock_mnt __read_mostly; | |
424 | ||
425 | static struct file_system_type sock_fs_type = { | |
426 | .name = "sockfs", | |
fba9be49 | 427 | .init_fs_context = sockfs_init_fs_context, |
c74a1cbb AV |
428 | .kill_sb = kill_anon_super, |
429 | }; | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * Obtains the first available file descriptor and sets it up for use. | |
433 | * | |
39d8c1b6 DM |
434 | * These functions create file structures and maps them to fd space |
435 | * of the current process. On success it returns file descriptor | |
1da177e4 LT |
436 | * and file struct implicitly stored in sock->file. |
437 | * Note that another thread may close file descriptor before we return | |
438 | * from this function. We use the fact that now we do not refer | |
439 | * to socket after mapping. If one day we will need it, this | |
440 | * function will increment ref. count on file by 1. | |
441 | * | |
442 | * In any case returned fd MAY BE not valid! | |
443 | * This race condition is unavoidable | |
444 | * with shared fd spaces, we cannot solve it inside kernel, | |
445 | * but we take care of internal coherence yet. | |
446 | */ | |
447 | ||
8a3c245c PT |
448 | /** |
449 | * sock_alloc_file - Bind a &socket to a &file | |
450 | * @sock: socket | |
451 | * @flags: file status flags | |
452 | * @dname: protocol name | |
453 | * | |
454 | * Returns the &file bound with @sock, implicitly storing it | |
455 | * in sock->file. If dname is %NULL, sets to "". | |
649c15c7 TLSC |
456 | * |
457 | * On failure @sock is released, and an ERR pointer is returned. | |
458 | * | |
8a3c245c PT |
459 | * This function uses GFP_KERNEL internally. |
460 | */ | |
461 | ||
aab174f0 | 462 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) |
1da177e4 | 463 | { |
7cbe66b6 | 464 | struct file *file; |
1da177e4 | 465 | |
d93aa9d8 AV |
466 | if (!dname) |
467 | dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; | |
39d8c1b6 | 468 | |
d93aa9d8 AV |
469 | file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, |
470 | O_RDWR | (flags & O_NONBLOCK), | |
471 | &socket_file_ops); | |
b5ffe634 | 472 | if (IS_ERR(file)) { |
8e1611e2 | 473 | sock_release(sock); |
39b65252 | 474 | return file; |
cc3808f8 AV |
475 | } |
476 | ||
fe34db06 | 477 | file->f_mode |= FMODE_NOWAIT; |
cc3808f8 | 478 | sock->file = file; |
39d8c1b6 | 479 | file->private_data = sock; |
d8e464ec | 480 | stream_open(SOCK_INODE(sock), file); |
28407630 | 481 | return file; |
39d8c1b6 | 482 | } |
56b31d1c | 483 | EXPORT_SYMBOL(sock_alloc_file); |
39d8c1b6 | 484 | |
56b31d1c | 485 | static int sock_map_fd(struct socket *sock, int flags) |
39d8c1b6 DM |
486 | { |
487 | struct file *newfile; | |
28407630 | 488 | int fd = get_unused_fd_flags(flags); |
ce4bb04c AV |
489 | if (unlikely(fd < 0)) { |
490 | sock_release(sock); | |
28407630 | 491 | return fd; |
ce4bb04c | 492 | } |
39d8c1b6 | 493 | |
aab174f0 | 494 | newfile = sock_alloc_file(sock, flags, NULL); |
4546e44c | 495 | if (!IS_ERR(newfile)) { |
39d8c1b6 | 496 | fd_install(fd, newfile); |
28407630 AV |
497 | return fd; |
498 | } | |
7cbe66b6 | 499 | |
28407630 AV |
500 | put_unused_fd(fd); |
501 | return PTR_ERR(newfile); | |
1da177e4 LT |
502 | } |
503 | ||
8a3c245c PT |
504 | /** |
505 | * sock_from_file - Return the &socket bounded to @file. | |
506 | * @file: file | |
8a3c245c | 507 | * |
dba4a925 | 508 | * On failure returns %NULL. |
8a3c245c PT |
509 | */ |
510 | ||
dba4a925 | 511 | struct socket *sock_from_file(struct file *file) |
6cb153ca | 512 | { |
6cb153ca | 513 | if (file->f_op == &socket_file_ops) |
da214a47 | 514 | return file->private_data; /* set in sock_alloc_file */ |
6cb153ca | 515 | |
23bb80d2 | 516 | return NULL; |
6cb153ca | 517 | } |
406a3c63 | 518 | EXPORT_SYMBOL(sock_from_file); |
6cb153ca | 519 | |
1da177e4 | 520 | /** |
c6d409cf | 521 | * sockfd_lookup - Go from a file number to its socket slot |
1da177e4 LT |
522 | * @fd: file handle |
523 | * @err: pointer to an error code return | |
524 | * | |
525 | * The file handle passed in is locked and the socket it is bound | |
241c4667 | 526 | * to is returned. If an error occurs the err pointer is overwritten |
1da177e4 LT |
527 | * with a negative errno code and NULL is returned. The function checks |
528 | * for both invalid handles and passing a handle which is not a socket. | |
529 | * | |
530 | * On a success the socket object pointer is returned. | |
531 | */ | |
532 | ||
533 | struct socket *sockfd_lookup(int fd, int *err) | |
534 | { | |
535 | struct file *file; | |
1da177e4 LT |
536 | struct socket *sock; |
537 | ||
89bddce5 SH |
538 | file = fget(fd); |
539 | if (!file) { | |
1da177e4 LT |
540 | *err = -EBADF; |
541 | return NULL; | |
542 | } | |
89bddce5 | 543 | |
dba4a925 FR |
544 | sock = sock_from_file(file); |
545 | if (!sock) { | |
546 | *err = -ENOTSOCK; | |
1da177e4 | 547 | fput(file); |
dba4a925 | 548 | } |
6cb153ca BL |
549 | return sock; |
550 | } | |
c6d409cf | 551 | EXPORT_SYMBOL(sockfd_lookup); |
1da177e4 | 552 | |
6cb153ca BL |
553 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
554 | { | |
00e188ef | 555 | struct fd f = fdget(fd); |
6cb153ca BL |
556 | struct socket *sock; |
557 | ||
3672558c | 558 | *err = -EBADF; |
00e188ef | 559 | if (f.file) { |
dba4a925 | 560 | sock = sock_from_file(f.file); |
00e188ef | 561 | if (likely(sock)) { |
ce787a5a | 562 | *fput_needed = f.flags & FDPUT_FPUT; |
6cb153ca | 563 | return sock; |
00e188ef | 564 | } |
dba4a925 | 565 | *err = -ENOTSOCK; |
00e188ef | 566 | fdput(f); |
1da177e4 | 567 | } |
6cb153ca | 568 | return NULL; |
1da177e4 LT |
569 | } |
570 | ||
600e1779 MY |
571 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, |
572 | size_t size) | |
573 | { | |
574 | ssize_t len; | |
575 | ssize_t used = 0; | |
576 | ||
c5ef6035 | 577 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); |
600e1779 MY |
578 | if (len < 0) |
579 | return len; | |
580 | used += len; | |
581 | if (buffer) { | |
582 | if (size < used) | |
583 | return -ERANGE; | |
584 | buffer += len; | |
585 | } | |
586 | ||
587 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
588 | used += len; | |
589 | if (buffer) { | |
590 | if (size < used) | |
591 | return -ERANGE; | |
592 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
593 | buffer += len; | |
594 | } | |
595 | ||
596 | return used; | |
597 | } | |
598 | ||
c1632a0f | 599 | static int sockfs_setattr(struct mnt_idmap *idmap, |
549c7297 | 600 | struct dentry *dentry, struct iattr *iattr) |
86741ec2 | 601 | { |
c1632a0f | 602 | int err = simple_setattr(&nop_mnt_idmap, dentry, iattr); |
86741ec2 | 603 | |
e1a3a60a | 604 | if (!err && (iattr->ia_valid & ATTR_UID)) { |
86741ec2 LC |
605 | struct socket *sock = SOCKET_I(d_inode(dentry)); |
606 | ||
6d8c50dc CW |
607 | if (sock->sk) |
608 | sock->sk->sk_uid = iattr->ia_uid; | |
609 | else | |
610 | err = -ENOENT; | |
86741ec2 LC |
611 | } |
612 | ||
613 | return err; | |
614 | } | |
615 | ||
600e1779 | 616 | static const struct inode_operations sockfs_inode_ops = { |
600e1779 | 617 | .listxattr = sockfs_listxattr, |
86741ec2 | 618 | .setattr = sockfs_setattr, |
600e1779 MY |
619 | }; |
620 | ||
1da177e4 | 621 | /** |
8a3c245c | 622 | * sock_alloc - allocate a socket |
89bddce5 | 623 | * |
1da177e4 LT |
624 | * Allocate a new inode and socket object. The two are bound together |
625 | * and initialised. The socket is then returned. If we are out of inodes | |
8a3c245c | 626 | * NULL is returned. This functions uses GFP_KERNEL internally. |
1da177e4 LT |
627 | */ |
628 | ||
f4a00aac | 629 | struct socket *sock_alloc(void) |
1da177e4 | 630 | { |
89bddce5 SH |
631 | struct inode *inode; |
632 | struct socket *sock; | |
1da177e4 | 633 | |
a209dfc7 | 634 | inode = new_inode_pseudo(sock_mnt->mnt_sb); |
1da177e4 LT |
635 | if (!inode) |
636 | return NULL; | |
637 | ||
638 | sock = SOCKET_I(inode); | |
639 | ||
85fe4025 | 640 | inode->i_ino = get_next_ino(); |
89bddce5 | 641 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
8192b0c4 DH |
642 | inode->i_uid = current_fsuid(); |
643 | inode->i_gid = current_fsgid(); | |
600e1779 | 644 | inode->i_op = &sockfs_inode_ops; |
1da177e4 | 645 | |
1da177e4 LT |
646 | return sock; |
647 | } | |
f4a00aac | 648 | EXPORT_SYMBOL(sock_alloc); |
1da177e4 | 649 | |
6d8c50dc | 650 | static void __sock_release(struct socket *sock, struct inode *inode) |
1da177e4 | 651 | { |
1ded5e5a ED |
652 | const struct proto_ops *ops = READ_ONCE(sock->ops); |
653 | ||
654 | if (ops) { | |
655 | struct module *owner = ops->owner; | |
1da177e4 | 656 | |
6d8c50dc CW |
657 | if (inode) |
658 | inode_lock(inode); | |
1ded5e5a | 659 | ops->release(sock); |
ff7b11aa | 660 | sock->sk = NULL; |
6d8c50dc CW |
661 | if (inode) |
662 | inode_unlock(inode); | |
1da177e4 LT |
663 | sock->ops = NULL; |
664 | module_put(owner); | |
665 | } | |
666 | ||
333f7909 | 667 | if (sock->wq.fasync_list) |
3410f22e | 668 | pr_err("%s: fasync list not empty!\n", __func__); |
1da177e4 | 669 | |
1da177e4 LT |
670 | if (!sock->file) { |
671 | iput(SOCK_INODE(sock)); | |
672 | return; | |
673 | } | |
89bddce5 | 674 | sock->file = NULL; |
1da177e4 | 675 | } |
6d8c50dc | 676 | |
9a8ad9ac AL |
677 | /** |
678 | * sock_release - close a socket | |
679 | * @sock: socket to close | |
680 | * | |
681 | * The socket is released from the protocol stack if it has a release | |
682 | * callback, and the inode is then released if the socket is bound to | |
683 | * an inode not a file. | |
684 | */ | |
6d8c50dc CW |
685 | void sock_release(struct socket *sock) |
686 | { | |
687 | __sock_release(sock, NULL); | |
688 | } | |
c6d409cf | 689 | EXPORT_SYMBOL(sock_release); |
1da177e4 | 690 | |
c14ac945 | 691 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) |
20d49473 | 692 | { |
140c55d4 ED |
693 | u8 flags = *tx_flags; |
694 | ||
51eb7492 | 695 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) { |
140c55d4 ED |
696 | flags |= SKBTX_HW_TSTAMP; |
697 | ||
51eb7492 GE |
698 | /* PTP hardware clocks can provide a free running cycle counter |
699 | * as a time base for virtual clocks. Tell driver to use the | |
700 | * free running cycle counter for timestamp if socket is bound | |
701 | * to virtual clock. | |
702 | */ | |
703 | if (tsflags & SOF_TIMESTAMPING_BIND_PHC) | |
704 | flags |= SKBTX_HW_TSTAMP_USE_CYCLES; | |
705 | } | |
706 | ||
c14ac945 | 707 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) |
140c55d4 ED |
708 | flags |= SKBTX_SW_TSTAMP; |
709 | ||
c14ac945 | 710 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) |
140c55d4 ED |
711 | flags |= SKBTX_SCHED_TSTAMP; |
712 | ||
140c55d4 | 713 | *tx_flags = flags; |
20d49473 | 714 | } |
67cc0d40 | 715 | EXPORT_SYMBOL(__sock_tx_timestamp); |
20d49473 | 716 | |
8c3c447b PA |
717 | INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *, |
718 | size_t)); | |
a648a592 PA |
719 | INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *, |
720 | size_t)); | |
6e6eda44 YC |
721 | |
722 | static noinline void call_trace_sock_send_length(struct sock *sk, int ret, | |
723 | int flags) | |
724 | { | |
725 | trace_sock_send_length(sk, ret, 0); | |
726 | } | |
727 | ||
d8725c86 | 728 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) |
1da177e4 | 729 | { |
1ded5e5a | 730 | int ret = INDIRECT_CALL_INET(READ_ONCE(sock->ops)->sendmsg, inet6_sendmsg, |
a648a592 PA |
731 | inet_sendmsg, sock, msg, |
732 | msg_data_left(msg)); | |
d8725c86 | 733 | BUG_ON(ret == -EIOCBQUEUED); |
6e6eda44 YC |
734 | |
735 | if (trace_sock_send_length_enabled()) | |
736 | call_trace_sock_send_length(sock->sk, ret, 0); | |
d8725c86 | 737 | return ret; |
1da177e4 LT |
738 | } |
739 | ||
86a7e0b6 JR |
740 | static int __sock_sendmsg(struct socket *sock, struct msghdr *msg) |
741 | { | |
742 | int err = security_socket_sendmsg(sock, msg, | |
743 | msg_data_left(msg)); | |
744 | ||
745 | return err ?: sock_sendmsg_nosec(sock, msg); | |
746 | } | |
747 | ||
85806af0 RD |
748 | /** |
749 | * sock_sendmsg - send a message through @sock | |
750 | * @sock: socket | |
751 | * @msg: message to send | |
752 | * | |
753 | * Sends @msg through @sock, passing through LSM. | |
754 | * Returns the number of bytes sent, or an error code. | |
755 | */ | |
d8725c86 | 756 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) |
228e548e | 757 | { |
86a7e0b6 JR |
758 | struct sockaddr_storage *save_addr = (struct sockaddr_storage *)msg->msg_name; |
759 | struct sockaddr_storage address; | |
01b2885d | 760 | int save_len = msg->msg_namelen; |
86a7e0b6 | 761 | int ret; |
228e548e | 762 | |
86a7e0b6 JR |
763 | if (msg->msg_name) { |
764 | memcpy(&address, msg->msg_name, msg->msg_namelen); | |
765 | msg->msg_name = &address; | |
766 | } | |
767 | ||
768 | ret = __sock_sendmsg(sock, msg); | |
769 | msg->msg_name = save_addr; | |
01b2885d | 770 | msg->msg_namelen = save_len; |
86a7e0b6 JR |
771 | |
772 | return ret; | |
0cf00c6f | 773 | } |
c6d409cf | 774 | EXPORT_SYMBOL(sock_sendmsg); |
1da177e4 | 775 | |
8a3c245c PT |
776 | /** |
777 | * kernel_sendmsg - send a message through @sock (kernel-space) | |
778 | * @sock: socket | |
779 | * @msg: message header | |
780 | * @vec: kernel vec | |
781 | * @num: vec array length | |
782 | * @size: total message data size | |
783 | * | |
784 | * Builds the message data with @vec and sends it through @sock. | |
785 | * Returns the number of bytes sent, or an error code. | |
786 | */ | |
787 | ||
1da177e4 LT |
788 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
789 | struct kvec *vec, size_t num, size_t size) | |
790 | { | |
de4eda9d | 791 | iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size); |
d8725c86 | 792 | return sock_sendmsg(sock, msg); |
1da177e4 | 793 | } |
c6d409cf | 794 | EXPORT_SYMBOL(kernel_sendmsg); |
1da177e4 | 795 | |
8a3c245c PT |
796 | /** |
797 | * kernel_sendmsg_locked - send a message through @sock (kernel-space) | |
798 | * @sk: sock | |
799 | * @msg: message header | |
800 | * @vec: output s/g array | |
801 | * @num: output s/g array length | |
802 | * @size: total message data size | |
803 | * | |
804 | * Builds the message data with @vec and sends it through @sock. | |
805 | * Returns the number of bytes sent, or an error code. | |
806 | * Caller must hold @sk. | |
807 | */ | |
808 | ||
306b13eb TH |
809 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, |
810 | struct kvec *vec, size_t num, size_t size) | |
811 | { | |
812 | struct socket *sock = sk->sk_socket; | |
1ded5e5a | 813 | const struct proto_ops *ops = READ_ONCE(sock->ops); |
306b13eb | 814 | |
1ded5e5a | 815 | if (!ops->sendmsg_locked) |
db5980d8 | 816 | return sock_no_sendmsg_locked(sk, msg, size); |
306b13eb | 817 | |
de4eda9d | 818 | iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size); |
306b13eb | 819 | |
1ded5e5a | 820 | return ops->sendmsg_locked(sk, msg, msg_data_left(msg)); |
306b13eb TH |
821 | } |
822 | EXPORT_SYMBOL(kernel_sendmsg_locked); | |
823 | ||
8605330a SHY |
824 | static bool skb_is_err_queue(const struct sk_buff *skb) |
825 | { | |
826 | /* pkt_type of skbs enqueued on the error queue are set to | |
827 | * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do | |
828 | * in recvmsg, since skbs received on a local socket will never | |
829 | * have a pkt_type of PACKET_OUTGOING. | |
830 | */ | |
831 | return skb->pkt_type == PACKET_OUTGOING; | |
832 | } | |
833 | ||
b50a5c70 ML |
834 | /* On transmit, software and hardware timestamps are returned independently. |
835 | * As the two skb clones share the hardware timestamp, which may be updated | |
836 | * before the software timestamp is received, a hardware TX timestamp may be | |
837 | * returned only if there is no software TX timestamp. Ignore false software | |
838 | * timestamps, which may be made in the __sock_recv_timestamp() call when the | |
7f1bc6e9 | 839 | * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a |
b50a5c70 ML |
840 | * hardware timestamp. |
841 | */ | |
842 | static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) | |
843 | { | |
844 | return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); | |
845 | } | |
846 | ||
97dc7cd9 GE |
847 | static ktime_t get_timestamp(struct sock *sk, struct sk_buff *skb, int *if_index) |
848 | { | |
e3390b30 | 849 | bool cycles = READ_ONCE(sk->sk_tsflags) & SOF_TIMESTAMPING_BIND_PHC; |
97dc7cd9 GE |
850 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
851 | struct net_device *orig_dev; | |
852 | ktime_t hwtstamp; | |
853 | ||
854 | rcu_read_lock(); | |
855 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
856 | if (orig_dev) { | |
857 | *if_index = orig_dev->ifindex; | |
858 | hwtstamp = netdev_get_tstamp(orig_dev, shhwtstamps, cycles); | |
859 | } else { | |
860 | hwtstamp = shhwtstamps->hwtstamp; | |
861 | } | |
862 | rcu_read_unlock(); | |
863 | ||
864 | return hwtstamp; | |
865 | } | |
866 | ||
867 | static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb, | |
868 | int if_index) | |
aad9c8c4 ML |
869 | { |
870 | struct scm_ts_pktinfo ts_pktinfo; | |
871 | struct net_device *orig_dev; | |
872 | ||
873 | if (!skb_mac_header_was_set(skb)) | |
874 | return; | |
875 | ||
876 | memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); | |
877 | ||
97dc7cd9 GE |
878 | if (!if_index) { |
879 | rcu_read_lock(); | |
880 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
881 | if (orig_dev) | |
882 | if_index = orig_dev->ifindex; | |
883 | rcu_read_unlock(); | |
884 | } | |
885 | ts_pktinfo.if_index = if_index; | |
aad9c8c4 ML |
886 | |
887 | ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); | |
888 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, | |
889 | sizeof(ts_pktinfo), &ts_pktinfo); | |
890 | } | |
891 | ||
92f37fd2 ED |
892 | /* |
893 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
894 | */ | |
895 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
896 | struct sk_buff *skb) | |
897 | { | |
20d49473 | 898 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
887feae3 | 899 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
9718475e | 900 | struct scm_timestamping_internal tss; |
b50a5c70 | 901 | int empty = 1, false_tstamp = 0; |
20d49473 PO |
902 | struct skb_shared_hwtstamps *shhwtstamps = |
903 | skb_hwtstamps(skb); | |
97dc7cd9 | 904 | int if_index; |
007747a9 | 905 | ktime_t hwtstamp; |
e3390b30 | 906 | u32 tsflags; |
20d49473 PO |
907 | |
908 | /* Race occurred between timestamp enabling and packet | |
909 | receiving. Fill in the current time for now. */ | |
b50a5c70 | 910 | if (need_software_tstamp && skb->tstamp == 0) { |
20d49473 | 911 | __net_timestamp(skb); |
b50a5c70 ML |
912 | false_tstamp = 1; |
913 | } | |
20d49473 PO |
914 | |
915 | if (need_software_tstamp) { | |
916 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 DD |
917 | if (new_tstamp) { |
918 | struct __kernel_sock_timeval tv; | |
919 | ||
920 | skb_get_new_timestamp(skb, &tv); | |
921 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, | |
922 | sizeof(tv), &tv); | |
923 | } else { | |
924 | struct __kernel_old_timeval tv; | |
925 | ||
926 | skb_get_timestamp(skb, &tv); | |
927 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, | |
928 | sizeof(tv), &tv); | |
929 | } | |
20d49473 | 930 | } else { |
887feae3 DD |
931 | if (new_tstamp) { |
932 | struct __kernel_timespec ts; | |
933 | ||
934 | skb_get_new_timestampns(skb, &ts); | |
935 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, | |
936 | sizeof(ts), &ts); | |
937 | } else { | |
df1b4ba9 | 938 | struct __kernel_old_timespec ts; |
887feae3 DD |
939 | |
940 | skb_get_timestampns(skb, &ts); | |
941 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, | |
942 | sizeof(ts), &ts); | |
943 | } | |
20d49473 PO |
944 | } |
945 | } | |
946 | ||
f24b9be5 | 947 | memset(&tss, 0, sizeof(tss)); |
e3390b30 | 948 | tsflags = READ_ONCE(sk->sk_tsflags); |
be8e9eb3 JX |
949 | if ((tsflags & SOF_TIMESTAMPING_SOFTWARE && |
950 | (tsflags & SOF_TIMESTAMPING_RX_SOFTWARE || | |
951 | skb_is_err_queue(skb) || | |
952 | !(tsflags & SOF_TIMESTAMPING_OPT_RX_FILTER))) && | |
9718475e | 953 | ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) |
20d49473 | 954 | empty = 0; |
4d276eb6 | 955 | if (shhwtstamps && |
be8e9eb3 JX |
956 | (tsflags & SOF_TIMESTAMPING_RAW_HARDWARE && |
957 | (tsflags & SOF_TIMESTAMPING_RX_HARDWARE || | |
958 | skb_is_err_queue(skb) || | |
959 | !(tsflags & SOF_TIMESTAMPING_OPT_RX_FILTER))) && | |
d7c08826 | 960 | !skb_is_swtx_tstamp(skb, false_tstamp)) { |
97dc7cd9 GE |
961 | if_index = 0; |
962 | if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP_NETDEV) | |
963 | hwtstamp = get_timestamp(sk, skb, &if_index); | |
007747a9 ML |
964 | else |
965 | hwtstamp = shhwtstamps->hwtstamp; | |
d7c08826 | 966 | |
e3390b30 | 967 | if (tsflags & SOF_TIMESTAMPING_BIND_PHC) |
97dc7cd9 | 968 | hwtstamp = ptp_convert_timestamp(&hwtstamp, |
251cd405 | 969 | READ_ONCE(sk->sk_bind_phc)); |
97dc7cd9 | 970 | |
007747a9 | 971 | if (ktime_to_timespec64_cond(hwtstamp, tss.ts + 2)) { |
d7c08826 YL |
972 | empty = 0; |
973 | ||
e3390b30 | 974 | if ((tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && |
d7c08826 | 975 | !skb_is_err_queue(skb)) |
97dc7cd9 | 976 | put_ts_pktinfo(msg, skb, if_index); |
d7c08826 | 977 | } |
aad9c8c4 | 978 | } |
1c885808 | 979 | if (!empty) { |
9718475e DD |
980 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) |
981 | put_cmsg_scm_timestamping64(msg, &tss); | |
982 | else | |
983 | put_cmsg_scm_timestamping(msg, &tss); | |
1c885808 | 984 | |
8605330a | 985 | if (skb_is_err_queue(skb) && skb->len && |
4ef1b286 | 986 | SKB_EXT_ERR(skb)->opt_stats) |
1c885808 FY |
987 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, |
988 | skb->len, skb->data); | |
989 | } | |
92f37fd2 | 990 | } |
7c81fd8b ACM |
991 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
992 | ||
eb6fba75 | 993 | #ifdef CONFIG_WIRELESS |
6e3e939f JB |
994 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
995 | struct sk_buff *skb) | |
996 | { | |
997 | int ack; | |
998 | ||
999 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
1000 | return; | |
1001 | if (!skb->wifi_acked_valid) | |
1002 | return; | |
1003 | ||
1004 | ack = skb->wifi_acked; | |
1005 | ||
1006 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
1007 | } | |
1008 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
eb6fba75 | 1009 | #endif |
6e3e939f | 1010 | |
11165f14 | 1011 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
1012 | struct sk_buff *skb) | |
3b885787 | 1013 | { |
744d5a3e | 1014 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) |
3b885787 | 1015 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
744d5a3e | 1016 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); |
3b885787 NH |
1017 | } |
1018 | ||
6fd1d51c EM |
1019 | static void sock_recv_mark(struct msghdr *msg, struct sock *sk, |
1020 | struct sk_buff *skb) | |
1021 | { | |
2558b803 ED |
1022 | if (sock_flag(sk, SOCK_RCVMARK) && skb) { |
1023 | /* We must use a bounce buffer for CONFIG_HARDENED_USERCOPY=y */ | |
1024 | __u32 mark = skb->mark; | |
1025 | ||
1026 | put_cmsg(msg, SOL_SOCKET, SO_MARK, sizeof(__u32), &mark); | |
1027 | } | |
6fd1d51c EM |
1028 | } |
1029 | ||
1030 | void __sock_recv_cmsgs(struct msghdr *msg, struct sock *sk, | |
1031 | struct sk_buff *skb) | |
3b885787 NH |
1032 | { |
1033 | sock_recv_timestamp(msg, sk, skb); | |
1034 | sock_recv_drops(msg, sk, skb); | |
6fd1d51c | 1035 | sock_recv_mark(msg, sk, skb); |
3b885787 | 1036 | } |
6fd1d51c | 1037 | EXPORT_SYMBOL_GPL(__sock_recv_cmsgs); |
3b885787 | 1038 | |
8c3c447b | 1039 | INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *, |
a648a592 PA |
1040 | size_t, int)); |
1041 | INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *, | |
1042 | size_t, int)); | |
6e6eda44 YC |
1043 | |
1044 | static noinline void call_trace_sock_recv_length(struct sock *sk, int ret, int flags) | |
1045 | { | |
1046 | trace_sock_recv_length(sk, ret, flags); | |
1047 | } | |
1048 | ||
1b784140 | 1049 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
2da62906 | 1050 | int flags) |
1da177e4 | 1051 | { |
1ded5e5a ED |
1052 | int ret = INDIRECT_CALL_INET(READ_ONCE(sock->ops)->recvmsg, |
1053 | inet6_recvmsg, | |
6e6eda44 YC |
1054 | inet_recvmsg, sock, msg, |
1055 | msg_data_left(msg), flags); | |
1056 | if (trace_sock_recv_length_enabled()) | |
1057 | call_trace_sock_recv_length(sock->sk, ret, flags); | |
1058 | return ret; | |
1da177e4 LT |
1059 | } |
1060 | ||
85806af0 RD |
1061 | /** |
1062 | * sock_recvmsg - receive a message from @sock | |
1063 | * @sock: socket | |
1064 | * @msg: message to receive | |
1065 | * @flags: message flags | |
1066 | * | |
1067 | * Receives @msg from @sock, passing through LSM. Returns the total number | |
1068 | * of bytes received, or an error. | |
1069 | */ | |
2da62906 | 1070 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) |
a2e27255 | 1071 | { |
2da62906 | 1072 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); |
a2e27255 | 1073 | |
2da62906 | 1074 | return err ?: sock_recvmsg_nosec(sock, msg, flags); |
1da177e4 | 1075 | } |
c6d409cf | 1076 | EXPORT_SYMBOL(sock_recvmsg); |
1da177e4 | 1077 | |
c1249c0a | 1078 | /** |
8a3c245c PT |
1079 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
1080 | * @sock: The socket to receive the message from | |
1081 | * @msg: Received message | |
1082 | * @vec: Input s/g array for message data | |
1083 | * @num: Size of input s/g array | |
1084 | * @size: Number of bytes to read | |
1085 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
c1249c0a | 1086 | * |
8a3c245c PT |
1087 | * On return the msg structure contains the scatter/gather array passed in the |
1088 | * vec argument. The array is modified so that it consists of the unfilled | |
1089 | * portion of the original array. | |
c1249c0a | 1090 | * |
8a3c245c | 1091 | * The returned value is the total number of bytes received, or an error. |
c1249c0a | 1092 | */ |
8a3c245c | 1093 | |
89bddce5 SH |
1094 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
1095 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 | 1096 | { |
1f466e1f | 1097 | msg->msg_control_is_user = false; |
de4eda9d | 1098 | iov_iter_kvec(&msg->msg_iter, ITER_DEST, vec, num, size); |
1f466e1f | 1099 | return sock_recvmsg(sock, msg, flags); |
1da177e4 | 1100 | } |
c6d409cf | 1101 | EXPORT_SYMBOL(kernel_recvmsg); |
1da177e4 | 1102 | |
9c55e01c | 1103 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 1104 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c JA |
1105 | unsigned int flags) |
1106 | { | |
1107 | struct socket *sock = file->private_data; | |
1ded5e5a | 1108 | const struct proto_ops *ops; |
9c55e01c | 1109 | |
1ded5e5a ED |
1110 | ops = READ_ONCE(sock->ops); |
1111 | if (unlikely(!ops->splice_read)) | |
67178fd0 | 1112 | return copy_splice_read(file, ppos, pipe, len, flags); |
997b37da | 1113 | |
1ded5e5a | 1114 | return ops->splice_read(sock, ppos, pipe, len, flags); |
9c55e01c JA |
1115 | } |
1116 | ||
2bfc6685 DH |
1117 | static void sock_splice_eof(struct file *file) |
1118 | { | |
1119 | struct socket *sock = file->private_data; | |
1ded5e5a | 1120 | const struct proto_ops *ops; |
2bfc6685 | 1121 | |
1ded5e5a ED |
1122 | ops = READ_ONCE(sock->ops); |
1123 | if (ops->splice_eof) | |
1124 | ops->splice_eof(sock); | |
2bfc6685 DH |
1125 | } |
1126 | ||
8ae5e030 | 1127 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) |
ce1d4d3e | 1128 | { |
6d652330 AV |
1129 | struct file *file = iocb->ki_filp; |
1130 | struct socket *sock = file->private_data; | |
0345f931 | 1131 | struct msghdr msg = {.msg_iter = *to, |
1132 | .msg_iocb = iocb}; | |
8ae5e030 | 1133 | ssize_t res; |
ce1d4d3e | 1134 | |
ebfcd895 | 1135 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
1136 | msg.msg_flags = MSG_DONTWAIT; |
1137 | ||
1138 | if (iocb->ki_pos != 0) | |
1da177e4 | 1139 | return -ESPIPE; |
027445c3 | 1140 | |
66ee59af | 1141 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ |
1da177e4 LT |
1142 | return 0; |
1143 | ||
2da62906 | 1144 | res = sock_recvmsg(sock, &msg, msg.msg_flags); |
8ae5e030 AV |
1145 | *to = msg.msg_iter; |
1146 | return res; | |
1da177e4 LT |
1147 | } |
1148 | ||
8ae5e030 | 1149 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ce1d4d3e | 1150 | { |
6d652330 AV |
1151 | struct file *file = iocb->ki_filp; |
1152 | struct socket *sock = file->private_data; | |
0345f931 | 1153 | struct msghdr msg = {.msg_iter = *from, |
1154 | .msg_iocb = iocb}; | |
8ae5e030 | 1155 | ssize_t res; |
1da177e4 | 1156 | |
8ae5e030 | 1157 | if (iocb->ki_pos != 0) |
ce1d4d3e | 1158 | return -ESPIPE; |
027445c3 | 1159 | |
ebfcd895 | 1160 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
1161 | msg.msg_flags = MSG_DONTWAIT; |
1162 | ||
6d652330 AV |
1163 | if (sock->type == SOCK_SEQPACKET) |
1164 | msg.msg_flags |= MSG_EOR; | |
1165 | ||
86a7e0b6 | 1166 | res = __sock_sendmsg(sock, &msg); |
8ae5e030 AV |
1167 | *from = msg.msg_iter; |
1168 | return res; | |
1da177e4 LT |
1169 | } |
1170 | ||
1da177e4 LT |
1171 | /* |
1172 | * Atomic setting of ioctl hooks to avoid race | |
1173 | * with module unload. | |
1174 | */ | |
1175 | ||
4a3e2f71 | 1176 | static DEFINE_MUTEX(br_ioctl_mutex); |
ad2f99ae AB |
1177 | static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br, |
1178 | unsigned int cmd, struct ifreq *ifr, | |
1179 | void __user *uarg); | |
1da177e4 | 1180 | |
ad2f99ae AB |
1181 | void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br, |
1182 | unsigned int cmd, struct ifreq *ifr, | |
1183 | void __user *uarg)) | |
1da177e4 | 1184 | { |
4a3e2f71 | 1185 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 1186 | br_ioctl_hook = hook; |
4a3e2f71 | 1187 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1188 | } |
1189 | EXPORT_SYMBOL(brioctl_set); | |
1190 | ||
ad2f99ae AB |
1191 | int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd, |
1192 | struct ifreq *ifr, void __user *uarg) | |
1193 | { | |
1194 | int err = -ENOPKG; | |
1195 | ||
1196 | if (!br_ioctl_hook) | |
1197 | request_module("bridge"); | |
1198 | ||
1199 | mutex_lock(&br_ioctl_mutex); | |
1200 | if (br_ioctl_hook) | |
1201 | err = br_ioctl_hook(net, br, cmd, ifr, uarg); | |
1202 | mutex_unlock(&br_ioctl_mutex); | |
1203 | ||
1204 | return err; | |
1205 | } | |
1206 | ||
4a3e2f71 | 1207 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 1208 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 1209 | |
881d966b | 1210 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 1211 | { |
4a3e2f71 | 1212 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1213 | vlan_ioctl_hook = hook; |
4a3e2f71 | 1214 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 LT |
1215 | } |
1216 | EXPORT_SYMBOL(vlan_ioctl_set); | |
1217 | ||
6b96018b | 1218 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
63ff03ab | 1219 | unsigned int cmd, unsigned long arg) |
6b96018b | 1220 | { |
1ded5e5a | 1221 | const struct proto_ops *ops = READ_ONCE(sock->ops); |
876f0bf9 AB |
1222 | struct ifreq ifr; |
1223 | bool need_copyout; | |
6b96018b AB |
1224 | int err; |
1225 | void __user *argp = (void __user *)arg; | |
a554bf96 | 1226 | void __user *data; |
6b96018b | 1227 | |
1ded5e5a | 1228 | err = ops->ioctl(sock, cmd, arg); |
6b96018b AB |
1229 | |
1230 | /* | |
1231 | * If this ioctl is unknown try to hand it down | |
1232 | * to the NIC driver. | |
1233 | */ | |
36fd633e AV |
1234 | if (err != -ENOIOCTLCMD) |
1235 | return err; | |
6b96018b | 1236 | |
29ce8f97 JK |
1237 | if (!is_socket_ioctl_cmd(cmd)) |
1238 | return -ENOTTY; | |
1239 | ||
a554bf96 | 1240 | if (get_user_ifreq(&ifr, &data, argp)) |
876f0bf9 | 1241 | return -EFAULT; |
a554bf96 | 1242 | err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); |
876f0bf9 | 1243 | if (!err && need_copyout) |
a554bf96 | 1244 | if (put_user_ifreq(&ifr, argp)) |
44c02a2c | 1245 | return -EFAULT; |
876f0bf9 | 1246 | |
6b96018b AB |
1247 | return err; |
1248 | } | |
1249 | ||
1da177e4 LT |
1250 | /* |
1251 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
1252 | * what to do with it - that's up to the protocol still. | |
1253 | */ | |
1254 | ||
1255 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
1256 | { | |
1ded5e5a | 1257 | const struct proto_ops *ops; |
1da177e4 | 1258 | struct socket *sock; |
881d966b | 1259 | struct sock *sk; |
1da177e4 LT |
1260 | void __user *argp = (void __user *)arg; |
1261 | int pid, err; | |
881d966b | 1262 | struct net *net; |
1da177e4 | 1263 | |
b69aee04 | 1264 | sock = file->private_data; |
1ded5e5a | 1265 | ops = READ_ONCE(sock->ops); |
881d966b | 1266 | sk = sock->sk; |
3b1e0a65 | 1267 | net = sock_net(sk); |
44c02a2c AV |
1268 | if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { |
1269 | struct ifreq ifr; | |
a554bf96 | 1270 | void __user *data; |
44c02a2c | 1271 | bool need_copyout; |
a554bf96 | 1272 | if (get_user_ifreq(&ifr, &data, argp)) |
44c02a2c | 1273 | return -EFAULT; |
a554bf96 | 1274 | err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); |
44c02a2c | 1275 | if (!err && need_copyout) |
a554bf96 | 1276 | if (put_user_ifreq(&ifr, argp)) |
44c02a2c | 1277 | return -EFAULT; |
1da177e4 | 1278 | } else |
3d23e349 | 1279 | #ifdef CONFIG_WEXT_CORE |
1da177e4 | 1280 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
b1b0c245 | 1281 | err = wext_handle_ioctl(net, cmd, argp); |
1da177e4 | 1282 | } else |
3d23e349 | 1283 | #endif |
89bddce5 | 1284 | switch (cmd) { |
1da177e4 LT |
1285 | case FIOSETOWN: |
1286 | case SIOCSPGRP: | |
1287 | err = -EFAULT; | |
1288 | if (get_user(pid, (int __user *)argp)) | |
1289 | break; | |
393cc3f5 | 1290 | err = f_setown(sock->file, pid, 1); |
1da177e4 LT |
1291 | break; |
1292 | case FIOGETOWN: | |
1293 | case SIOCGPGRP: | |
609d7fa9 | 1294 | err = put_user(f_getown(sock->file), |
89bddce5 | 1295 | (int __user *)argp); |
1da177e4 LT |
1296 | break; |
1297 | case SIOCGIFBR: | |
1298 | case SIOCSIFBR: | |
1299 | case SIOCBRADDBR: | |
1300 | case SIOCBRDELBR: | |
ad2f99ae | 1301 | err = br_ioctl_call(net, NULL, cmd, NULL, argp); |
1da177e4 LT |
1302 | break; |
1303 | case SIOCGIFVLAN: | |
1304 | case SIOCSIFVLAN: | |
1305 | err = -ENOPKG; | |
1306 | if (!vlan_ioctl_hook) | |
1307 | request_module("8021q"); | |
1308 | ||
4a3e2f71 | 1309 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1310 | if (vlan_ioctl_hook) |
881d966b | 1311 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 1312 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 1313 | break; |
c62cce2c AV |
1314 | case SIOCGSKNS: |
1315 | err = -EPERM; | |
1316 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1317 | break; | |
1318 | ||
1319 | err = open_related_ns(&net->ns, get_net_ns); | |
1320 | break; | |
0768e170 AB |
1321 | case SIOCGSTAMP_OLD: |
1322 | case SIOCGSTAMPNS_OLD: | |
1ded5e5a | 1323 | if (!ops->gettstamp) { |
c7cbdbf2 AB |
1324 | err = -ENOIOCTLCMD; |
1325 | break; | |
1326 | } | |
1ded5e5a ED |
1327 | err = ops->gettstamp(sock, argp, |
1328 | cmd == SIOCGSTAMP_OLD, | |
1329 | !IS_ENABLED(CONFIG_64BIT)); | |
60747828 | 1330 | break; |
0768e170 AB |
1331 | case SIOCGSTAMP_NEW: |
1332 | case SIOCGSTAMPNS_NEW: | |
1ded5e5a | 1333 | if (!ops->gettstamp) { |
0768e170 AB |
1334 | err = -ENOIOCTLCMD; |
1335 | break; | |
1336 | } | |
1ded5e5a ED |
1337 | err = ops->gettstamp(sock, argp, |
1338 | cmd == SIOCGSTAMP_NEW, | |
1339 | false); | |
c7cbdbf2 | 1340 | break; |
876f0bf9 AB |
1341 | |
1342 | case SIOCGIFCONF: | |
1343 | err = dev_ifconf(net, argp); | |
1344 | break; | |
1345 | ||
1da177e4 | 1346 | default: |
63ff03ab | 1347 | err = sock_do_ioctl(net, sock, cmd, arg); |
1da177e4 | 1348 | break; |
89bddce5 | 1349 | } |
1da177e4 LT |
1350 | return err; |
1351 | } | |
1352 | ||
8a3c245c PT |
1353 | /** |
1354 | * sock_create_lite - creates a socket | |
1355 | * @family: protocol family (AF_INET, ...) | |
1356 | * @type: communication type (SOCK_STREAM, ...) | |
1357 | * @protocol: protocol (0, ...) | |
1358 | * @res: new socket | |
1359 | * | |
1360 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1361 | * The new socket initialization is not complete, see kernel_accept(). | |
1362 | * Returns 0 or an error. On failure @res is set to %NULL. | |
1363 | * This function internally uses GFP_KERNEL. | |
1364 | */ | |
1365 | ||
1da177e4 LT |
1366 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
1367 | { | |
1368 | int err; | |
1369 | struct socket *sock = NULL; | |
89bddce5 | 1370 | |
1da177e4 LT |
1371 | err = security_socket_create(family, type, protocol, 1); |
1372 | if (err) | |
1373 | goto out; | |
1374 | ||
1375 | sock = sock_alloc(); | |
1376 | if (!sock) { | |
1377 | err = -ENOMEM; | |
1378 | goto out; | |
1379 | } | |
1380 | ||
1da177e4 | 1381 | sock->type = type; |
7420ed23 VY |
1382 | err = security_socket_post_create(sock, family, type, protocol, 1); |
1383 | if (err) | |
1384 | goto out_release; | |
1385 | ||
1da177e4 LT |
1386 | out: |
1387 | *res = sock; | |
1388 | return err; | |
7420ed23 VY |
1389 | out_release: |
1390 | sock_release(sock); | |
1391 | sock = NULL; | |
1392 | goto out; | |
1da177e4 | 1393 | } |
c6d409cf | 1394 | EXPORT_SYMBOL(sock_create_lite); |
1da177e4 LT |
1395 | |
1396 | /* No kernel lock held - perfect */ | |
ade994f4 | 1397 | static __poll_t sock_poll(struct file *file, poll_table *wait) |
1da177e4 | 1398 | { |
3cafb376 | 1399 | struct socket *sock = file->private_data; |
1ded5e5a | 1400 | const struct proto_ops *ops = READ_ONCE(sock->ops); |
a331de3b | 1401 | __poll_t events = poll_requested_events(wait), flag = 0; |
2d48d67f | 1402 | |
1ded5e5a | 1403 | if (!ops->poll) |
e88958e6 | 1404 | return 0; |
f641f13b | 1405 | |
a331de3b CH |
1406 | if (sk_can_busy_loop(sock->sk)) { |
1407 | /* poll once if requested by the syscall */ | |
1408 | if (events & POLL_BUSY_LOOP) | |
1409 | sk_busy_loop(sock->sk, 1); | |
1410 | ||
1411 | /* if this socket can poll_ll, tell the system call */ | |
1412 | flag = POLL_BUSY_LOOP; | |
1413 | } | |
1414 | ||
1ded5e5a | 1415 | return ops->poll(file, sock, wait) | flag; |
1da177e4 LT |
1416 | } |
1417 | ||
89bddce5 | 1418 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 1419 | { |
b69aee04 | 1420 | struct socket *sock = file->private_data; |
1da177e4 | 1421 | |
1ded5e5a | 1422 | return READ_ONCE(sock->ops)->mmap(file, sock, vma); |
1da177e4 LT |
1423 | } |
1424 | ||
20380731 | 1425 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 | 1426 | { |
6d8c50dc | 1427 | __sock_release(SOCKET_I(inode), inode); |
1da177e4 LT |
1428 | return 0; |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * Update the socket async list | |
1433 | * | |
1434 | * Fasync_list locking strategy. | |
1435 | * | |
1436 | * 1. fasync_list is modified only under process context socket lock | |
1437 | * i.e. under semaphore. | |
1438 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
989a2979 | 1439 | * or under socket lock |
1da177e4 LT |
1440 | */ |
1441 | ||
1442 | static int sock_fasync(int fd, struct file *filp, int on) | |
1443 | { | |
989a2979 ED |
1444 | struct socket *sock = filp->private_data; |
1445 | struct sock *sk = sock->sk; | |
333f7909 | 1446 | struct socket_wq *wq = &sock->wq; |
1da177e4 | 1447 | |
989a2979 | 1448 | if (sk == NULL) |
1da177e4 | 1449 | return -EINVAL; |
1da177e4 LT |
1450 | |
1451 | lock_sock(sk); | |
eaefd110 | 1452 | fasync_helper(fd, filp, on, &wq->fasync_list); |
1da177e4 | 1453 | |
eaefd110 | 1454 | if (!wq->fasync_list) |
989a2979 ED |
1455 | sock_reset_flag(sk, SOCK_FASYNC); |
1456 | else | |
bcdce719 | 1457 | sock_set_flag(sk, SOCK_FASYNC); |
1da177e4 | 1458 | |
989a2979 | 1459 | release_sock(sk); |
1da177e4 LT |
1460 | return 0; |
1461 | } | |
1462 | ||
ceb5d58b | 1463 | /* This function may be called only under rcu_lock */ |
1da177e4 | 1464 | |
ceb5d58b | 1465 | int sock_wake_async(struct socket_wq *wq, int how, int band) |
1da177e4 | 1466 | { |
ceb5d58b | 1467 | if (!wq || !wq->fasync_list) |
1da177e4 | 1468 | return -1; |
ceb5d58b | 1469 | |
89bddce5 | 1470 | switch (how) { |
8d8ad9d7 | 1471 | case SOCK_WAKE_WAITD: |
ceb5d58b | 1472 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) |
1da177e4 LT |
1473 | break; |
1474 | goto call_kill; | |
8d8ad9d7 | 1475 | case SOCK_WAKE_SPACE: |
ceb5d58b | 1476 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) |
1da177e4 | 1477 | break; |
7c7ab580 | 1478 | fallthrough; |
8d8ad9d7 | 1479 | case SOCK_WAKE_IO: |
89bddce5 | 1480 | call_kill: |
43815482 | 1481 | kill_fasync(&wq->fasync_list, SIGIO, band); |
1da177e4 | 1482 | break; |
8d8ad9d7 | 1483 | case SOCK_WAKE_URG: |
43815482 | 1484 | kill_fasync(&wq->fasync_list, SIGURG, band); |
1da177e4 | 1485 | } |
ceb5d58b | 1486 | |
1da177e4 LT |
1487 | return 0; |
1488 | } | |
c6d409cf | 1489 | EXPORT_SYMBOL(sock_wake_async); |
1da177e4 | 1490 | |
8a3c245c PT |
1491 | /** |
1492 | * __sock_create - creates a socket | |
1493 | * @net: net namespace | |
1494 | * @family: protocol family (AF_INET, ...) | |
1495 | * @type: communication type (SOCK_STREAM, ...) | |
1496 | * @protocol: protocol (0, ...) | |
1497 | * @res: new socket | |
1498 | * @kern: boolean for kernel space sockets | |
1499 | * | |
1500 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1501 | * Returns 0 or an error. On failure @res is set to %NULL. @kern must | |
1502 | * be set to true if the socket resides in kernel space. | |
1503 | * This function internally uses GFP_KERNEL. | |
1504 | */ | |
1505 | ||
721db93a | 1506 | int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1507 | struct socket **res, int kern) |
1da177e4 LT |
1508 | { |
1509 | int err; | |
1510 | struct socket *sock; | |
55737fda | 1511 | const struct net_proto_family *pf; |
1da177e4 LT |
1512 | |
1513 | /* | |
89bddce5 | 1514 | * Check protocol is in range |
1da177e4 LT |
1515 | */ |
1516 | if (family < 0 || family >= NPROTO) | |
1517 | return -EAFNOSUPPORT; | |
1518 | if (type < 0 || type >= SOCK_MAX) | |
1519 | return -EINVAL; | |
1520 | ||
1521 | /* Compatibility. | |
1522 | ||
1523 | This uglymoron is moved from INET layer to here to avoid | |
1524 | deadlock in module load. | |
1525 | */ | |
1526 | if (family == PF_INET && type == SOCK_PACKET) { | |
f3c98690 | 1527 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1528 | current->comm); | |
1da177e4 LT |
1529 | family = PF_PACKET; |
1530 | } | |
1531 | ||
1532 | err = security_socket_create(family, type, protocol, kern); | |
1533 | if (err) | |
1534 | return err; | |
89bddce5 | 1535 | |
55737fda SH |
1536 | /* |
1537 | * Allocate the socket and allow the family to set things up. if | |
1538 | * the protocol is 0, the family is instructed to select an appropriate | |
1539 | * default. | |
1540 | */ | |
1541 | sock = sock_alloc(); | |
1542 | if (!sock) { | |
e87cc472 | 1543 | net_warn_ratelimited("socket: no more sockets\n"); |
55737fda SH |
1544 | return -ENFILE; /* Not exactly a match, but its the |
1545 | closest posix thing */ | |
1546 | } | |
1547 | ||
1548 | sock->type = type; | |
1549 | ||
95a5afca | 1550 | #ifdef CONFIG_MODULES |
89bddce5 SH |
1551 | /* Attempt to load a protocol module if the find failed. |
1552 | * | |
1553 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1554 | * requested real, full-featured networking support upon configuration. |
1555 | * Otherwise module support will break! | |
1556 | */ | |
190683a9 | 1557 | if (rcu_access_pointer(net_families[family]) == NULL) |
89bddce5 | 1558 | request_module("net-pf-%d", family); |
1da177e4 LT |
1559 | #endif |
1560 | ||
55737fda SH |
1561 | rcu_read_lock(); |
1562 | pf = rcu_dereference(net_families[family]); | |
1563 | err = -EAFNOSUPPORT; | |
1564 | if (!pf) | |
1565 | goto out_release; | |
1da177e4 LT |
1566 | |
1567 | /* | |
1568 | * We will call the ->create function, that possibly is in a loadable | |
1569 | * module, so we have to bump that loadable module refcnt first. | |
1570 | */ | |
55737fda | 1571 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1572 | goto out_release; |
1573 | ||
55737fda SH |
1574 | /* Now protected by module ref count */ |
1575 | rcu_read_unlock(); | |
1576 | ||
3f378b68 | 1577 | err = pf->create(net, sock, protocol, kern); |
55737fda | 1578 | if (err < 0) |
1da177e4 | 1579 | goto out_module_put; |
a79af59e | 1580 | |
1da177e4 LT |
1581 | /* |
1582 | * Now to bump the refcnt of the [loadable] module that owns this | |
1583 | * socket at sock_release time we decrement its refcnt. | |
1584 | */ | |
55737fda SH |
1585 | if (!try_module_get(sock->ops->owner)) |
1586 | goto out_module_busy; | |
1587 | ||
1da177e4 LT |
1588 | /* |
1589 | * Now that we're done with the ->create function, the [loadable] | |
1590 | * module can have its refcnt decremented | |
1591 | */ | |
55737fda | 1592 | module_put(pf->owner); |
7420ed23 VY |
1593 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1594 | if (err) | |
3b185525 | 1595 | goto out_sock_release; |
55737fda | 1596 | *res = sock; |
1da177e4 | 1597 | |
55737fda SH |
1598 | return 0; |
1599 | ||
1600 | out_module_busy: | |
1601 | err = -EAFNOSUPPORT; | |
1da177e4 | 1602 | out_module_put: |
55737fda SH |
1603 | sock->ops = NULL; |
1604 | module_put(pf->owner); | |
1605 | out_sock_release: | |
1da177e4 | 1606 | sock_release(sock); |
55737fda SH |
1607 | return err; |
1608 | ||
1609 | out_release: | |
1610 | rcu_read_unlock(); | |
1611 | goto out_sock_release; | |
1da177e4 | 1612 | } |
721db93a | 1613 | EXPORT_SYMBOL(__sock_create); |
1da177e4 | 1614 | |
8a3c245c PT |
1615 | /** |
1616 | * sock_create - creates a socket | |
1617 | * @family: protocol family (AF_INET, ...) | |
1618 | * @type: communication type (SOCK_STREAM, ...) | |
1619 | * @protocol: protocol (0, ...) | |
1620 | * @res: new socket | |
1621 | * | |
1622 | * A wrapper around __sock_create(). | |
1623 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1624 | */ | |
1625 | ||
1da177e4 LT |
1626 | int sock_create(int family, int type, int protocol, struct socket **res) |
1627 | { | |
1b8d7ae4 | 1628 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 | 1629 | } |
c6d409cf | 1630 | EXPORT_SYMBOL(sock_create); |
1da177e4 | 1631 | |
8a3c245c PT |
1632 | /** |
1633 | * sock_create_kern - creates a socket (kernel space) | |
1634 | * @net: net namespace | |
1635 | * @family: protocol family (AF_INET, ...) | |
1636 | * @type: communication type (SOCK_STREAM, ...) | |
1637 | * @protocol: protocol (0, ...) | |
1638 | * @res: new socket | |
1639 | * | |
1640 | * A wrapper around __sock_create(). | |
1641 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1642 | */ | |
1643 | ||
eeb1bd5c | 1644 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) |
1da177e4 | 1645 | { |
eeb1bd5c | 1646 | return __sock_create(net, family, type, protocol, res, 1); |
1da177e4 | 1647 | } |
c6d409cf | 1648 | EXPORT_SYMBOL(sock_create_kern); |
1da177e4 | 1649 | |
da214a47 | 1650 | static struct socket *__sys_socket_create(int family, int type, int protocol) |
1da177e4 | 1651 | { |
1da177e4 | 1652 | struct socket *sock; |
da214a47 | 1653 | int retval; |
a677a039 | 1654 | |
e38b36f3 UD |
1655 | /* Check the SOCK_* constants for consistency. */ |
1656 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1657 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1658 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1659 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1660 | ||
da214a47 JA |
1661 | if ((type & ~SOCK_TYPE_MASK) & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
1662 | return ERR_PTR(-EINVAL); | |
a677a039 | 1663 | type &= SOCK_TYPE_MASK; |
1da177e4 | 1664 | |
da214a47 JA |
1665 | retval = sock_create(family, type, protocol, &sock); |
1666 | if (retval < 0) | |
1667 | return ERR_PTR(retval); | |
1668 | ||
1669 | return sock; | |
1670 | } | |
1671 | ||
1672 | struct file *__sys_socket_file(int family, int type, int protocol) | |
1673 | { | |
1674 | struct socket *sock; | |
da214a47 JA |
1675 | int flags; |
1676 | ||
1677 | sock = __sys_socket_create(family, type, protocol); | |
1678 | if (IS_ERR(sock)) | |
1679 | return ERR_CAST(sock); | |
1680 | ||
1681 | flags = type & ~SOCK_TYPE_MASK; | |
aaca0bdc UD |
1682 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1683 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1684 | ||
649c15c7 | 1685 | return sock_alloc_file(sock, flags, NULL); |
da214a47 JA |
1686 | } |
1687 | ||
0dd061a6 GT |
1688 | /* A hook for bpf progs to attach to and update socket protocol. |
1689 | * | |
1690 | * A static noinline declaration here could cause the compiler to | |
1691 | * optimize away the function. A global noinline declaration will | |
1692 | * keep the definition, but may optimize away the callsite. | |
1693 | * Therefore, __weak is needed to ensure that the call is still | |
1694 | * emitted, by telling the compiler that we don't know what the | |
1695 | * function might eventually be. | |
0dd061a6 GT |
1696 | */ |
1697 | ||
15fb6f2b | 1698 | __bpf_hook_start(); |
0dd061a6 GT |
1699 | |
1700 | __weak noinline int update_socket_protocol(int family, int type, int protocol) | |
1701 | { | |
1702 | return protocol; | |
1703 | } | |
1704 | ||
15fb6f2b | 1705 | __bpf_hook_end(); |
0dd061a6 | 1706 | |
da214a47 JA |
1707 | int __sys_socket(int family, int type, int protocol) |
1708 | { | |
1709 | struct socket *sock; | |
1710 | int flags; | |
1711 | ||
0dd061a6 GT |
1712 | sock = __sys_socket_create(family, type, |
1713 | update_socket_protocol(family, type, protocol)); | |
da214a47 JA |
1714 | if (IS_ERR(sock)) |
1715 | return PTR_ERR(sock); | |
1716 | ||
1717 | flags = type & ~SOCK_TYPE_MASK; | |
1718 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1719 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1da177e4 | 1720 | |
8e1611e2 | 1721 | return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1da177e4 LT |
1722 | } |
1723 | ||
9d6a15c3 DB |
1724 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
1725 | { | |
1726 | return __sys_socket(family, type, protocol); | |
1727 | } | |
1728 | ||
1da177e4 LT |
1729 | /* |
1730 | * Create a pair of connected sockets. | |
1731 | */ | |
1732 | ||
6debc8d8 | 1733 | int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) |
1da177e4 LT |
1734 | { |
1735 | struct socket *sock1, *sock2; | |
1736 | int fd1, fd2, err; | |
db349509 | 1737 | struct file *newfile1, *newfile2; |
a677a039 UD |
1738 | int flags; |
1739 | ||
1740 | flags = type & ~SOCK_TYPE_MASK; | |
77d27200 | 1741 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1742 | return -EINVAL; |
1743 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1744 | |
aaca0bdc UD |
1745 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1746 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1747 | ||
016a266b AV |
1748 | /* |
1749 | * reserve descriptors and make sure we won't fail | |
1750 | * to return them to userland. | |
1751 | */ | |
1752 | fd1 = get_unused_fd_flags(flags); | |
1753 | if (unlikely(fd1 < 0)) | |
1754 | return fd1; | |
1755 | ||
1756 | fd2 = get_unused_fd_flags(flags); | |
1757 | if (unlikely(fd2 < 0)) { | |
1758 | put_unused_fd(fd1); | |
1759 | return fd2; | |
1760 | } | |
1761 | ||
1762 | err = put_user(fd1, &usockvec[0]); | |
1763 | if (err) | |
1764 | goto out; | |
1765 | ||
1766 | err = put_user(fd2, &usockvec[1]); | |
1767 | if (err) | |
1768 | goto out; | |
1769 | ||
1da177e4 LT |
1770 | /* |
1771 | * Obtain the first socket and check if the underlying protocol | |
1772 | * supports the socketpair call. | |
1773 | */ | |
1774 | ||
1775 | err = sock_create(family, type, protocol, &sock1); | |
016a266b | 1776 | if (unlikely(err < 0)) |
1da177e4 LT |
1777 | goto out; |
1778 | ||
1779 | err = sock_create(family, type, protocol, &sock2); | |
016a266b AV |
1780 | if (unlikely(err < 0)) { |
1781 | sock_release(sock1); | |
1782 | goto out; | |
bf3c23d1 | 1783 | } |
d73aa286 | 1784 | |
d47cd945 DH |
1785 | err = security_socket_socketpair(sock1, sock2); |
1786 | if (unlikely(err)) { | |
1787 | sock_release(sock2); | |
1788 | sock_release(sock1); | |
1789 | goto out; | |
1790 | } | |
1791 | ||
1ded5e5a | 1792 | err = READ_ONCE(sock1->ops)->socketpair(sock1, sock2); |
016a266b AV |
1793 | if (unlikely(err < 0)) { |
1794 | sock_release(sock2); | |
1795 | sock_release(sock1); | |
1796 | goto out; | |
28407630 AV |
1797 | } |
1798 | ||
aab174f0 | 1799 | newfile1 = sock_alloc_file(sock1, flags, NULL); |
b5ffe634 | 1800 | if (IS_ERR(newfile1)) { |
28407630 | 1801 | err = PTR_ERR(newfile1); |
016a266b AV |
1802 | sock_release(sock2); |
1803 | goto out; | |
28407630 AV |
1804 | } |
1805 | ||
aab174f0 | 1806 | newfile2 = sock_alloc_file(sock2, flags, NULL); |
28407630 AV |
1807 | if (IS_ERR(newfile2)) { |
1808 | err = PTR_ERR(newfile2); | |
016a266b AV |
1809 | fput(newfile1); |
1810 | goto out; | |
db349509 AV |
1811 | } |
1812 | ||
157cf649 | 1813 | audit_fd_pair(fd1, fd2); |
d73aa286 | 1814 | |
db349509 AV |
1815 | fd_install(fd1, newfile1); |
1816 | fd_install(fd2, newfile2); | |
d73aa286 | 1817 | return 0; |
1da177e4 | 1818 | |
016a266b | 1819 | out: |
d73aa286 | 1820 | put_unused_fd(fd2); |
d73aa286 | 1821 | put_unused_fd(fd1); |
1da177e4 LT |
1822 | return err; |
1823 | } | |
1824 | ||
6debc8d8 DB |
1825 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
1826 | int __user *, usockvec) | |
1827 | { | |
1828 | return __sys_socketpair(family, type, protocol, usockvec); | |
1829 | } | |
1830 | ||
dc2e7797 GKB |
1831 | int __sys_bind_socket(struct socket *sock, struct sockaddr_storage *address, |
1832 | int addrlen) | |
1833 | { | |
1834 | int err; | |
1835 | ||
1836 | err = security_socket_bind(sock, (struct sockaddr *)address, | |
1837 | addrlen); | |
1838 | if (!err) | |
1839 | err = READ_ONCE(sock->ops)->bind(sock, | |
1840 | (struct sockaddr *)address, | |
1841 | addrlen); | |
1842 | return err; | |
1843 | } | |
1844 | ||
1da177e4 LT |
1845 | /* |
1846 | * Bind a name to a socket. Nothing much to do here since it's | |
1847 | * the protocol's responsibility to handle the local address. | |
1848 | * | |
1849 | * We move the socket address to kernel space before we call | |
1850 | * the protocol layer (having also checked the address is ok). | |
1851 | */ | |
1852 | ||
a87d35d8 | 1853 | int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
1da177e4 LT |
1854 | { |
1855 | struct socket *sock; | |
230b1839 | 1856 | struct sockaddr_storage address; |
6cb153ca | 1857 | int err, fput_needed; |
1da177e4 | 1858 | |
89bddce5 | 1859 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1860 | if (sock) { |
43db362d | 1861 | err = move_addr_to_kernel(umyaddr, addrlen, &address); |
dc2e7797 GKB |
1862 | if (!err) |
1863 | err = __sys_bind_socket(sock, &address, addrlen); | |
6cb153ca | 1864 | fput_light(sock->file, fput_needed); |
89bddce5 | 1865 | } |
1da177e4 LT |
1866 | return err; |
1867 | } | |
1868 | ||
a87d35d8 DB |
1869 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
1870 | { | |
1871 | return __sys_bind(fd, umyaddr, addrlen); | |
1872 | } | |
1873 | ||
1da177e4 LT |
1874 | /* |
1875 | * Perform a listen. Basically, we allow the protocol to do anything | |
1876 | * necessary for a listen, and if that works, we mark the socket as | |
1877 | * ready for listening. | |
1878 | */ | |
bb6aaf73 GKB |
1879 | int __sys_listen_socket(struct socket *sock, int backlog) |
1880 | { | |
1881 | int somaxconn, err; | |
1882 | ||
1883 | somaxconn = READ_ONCE(sock_net(sock->sk)->core.sysctl_somaxconn); | |
1884 | if ((unsigned int)backlog > somaxconn) | |
1885 | backlog = somaxconn; | |
1886 | ||
1887 | err = security_socket_listen(sock, backlog); | |
1888 | if (!err) | |
1889 | err = READ_ONCE(sock->ops)->listen(sock, backlog); | |
1890 | return err; | |
1891 | } | |
1da177e4 | 1892 | |
25e290ee | 1893 | int __sys_listen(int fd, int backlog) |
1da177e4 LT |
1894 | { |
1895 | struct socket *sock; | |
6cb153ca | 1896 | int err, fput_needed; |
89bddce5 SH |
1897 | |
1898 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1899 | if (sock) { | |
bb6aaf73 | 1900 | err = __sys_listen_socket(sock, backlog); |
6cb153ca | 1901 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1902 | } |
1903 | return err; | |
1904 | } | |
1905 | ||
25e290ee DB |
1906 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
1907 | { | |
1908 | return __sys_listen(fd, backlog); | |
1909 | } | |
1910 | ||
0645fbe7 | 1911 | struct file *do_accept(struct file *file, struct proto_accept_arg *arg, |
de2ea4b6 | 1912 | struct sockaddr __user *upeer_sockaddr, |
d32f89da | 1913 | int __user *upeer_addrlen, int flags) |
1da177e4 LT |
1914 | { |
1915 | struct socket *sock, *newsock; | |
39d8c1b6 | 1916 | struct file *newfile; |
d32f89da | 1917 | int err, len; |
230b1839 | 1918 | struct sockaddr_storage address; |
1ded5e5a | 1919 | const struct proto_ops *ops; |
1da177e4 | 1920 | |
dba4a925 | 1921 | sock = sock_from_file(file); |
d32f89da PB |
1922 | if (!sock) |
1923 | return ERR_PTR(-ENOTSOCK); | |
1da177e4 | 1924 | |
c6d409cf ED |
1925 | newsock = sock_alloc(); |
1926 | if (!newsock) | |
d32f89da | 1927 | return ERR_PTR(-ENFILE); |
1ded5e5a | 1928 | ops = READ_ONCE(sock->ops); |
1da177e4 LT |
1929 | |
1930 | newsock->type = sock->type; | |
1ded5e5a | 1931 | newsock->ops = ops; |
1da177e4 | 1932 | |
1da177e4 LT |
1933 | /* |
1934 | * We don't need try_module_get here, as the listening socket (sock) | |
1935 | * has the protocol module (sock->ops->owner) held. | |
1936 | */ | |
1ded5e5a | 1937 | __module_get(ops->owner); |
1da177e4 | 1938 | |
aab174f0 | 1939 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); |
d32f89da PB |
1940 | if (IS_ERR(newfile)) |
1941 | return newfile; | |
39d8c1b6 | 1942 | |
a79af59e FF |
1943 | err = security_socket_accept(sock, newsock); |
1944 | if (err) | |
39d8c1b6 | 1945 | goto out_fd; |
a79af59e | 1946 | |
0645fbe7 JA |
1947 | arg->flags |= sock->file->f_flags; |
1948 | err = ops->accept(sock, newsock, arg); | |
1da177e4 | 1949 | if (err < 0) |
39d8c1b6 | 1950 | goto out_fd; |
1da177e4 LT |
1951 | |
1952 | if (upeer_sockaddr) { | |
1ded5e5a | 1953 | len = ops->getname(newsock, (struct sockaddr *)&address, 2); |
9b2c45d4 | 1954 | if (len < 0) { |
1da177e4 | 1955 | err = -ECONNABORTED; |
39d8c1b6 | 1956 | goto out_fd; |
1da177e4 | 1957 | } |
43db362d | 1958 | err = move_addr_to_user(&address, |
230b1839 | 1959 | len, upeer_sockaddr, upeer_addrlen); |
1da177e4 | 1960 | if (err < 0) |
39d8c1b6 | 1961 | goto out_fd; |
1da177e4 LT |
1962 | } |
1963 | ||
1964 | /* File flags are not inherited via accept() unlike another OSes. */ | |
d32f89da | 1965 | return newfile; |
39d8c1b6 | 1966 | out_fd: |
9606a216 | 1967 | fput(newfile); |
d32f89da PB |
1968 | return ERR_PTR(err); |
1969 | } | |
1970 | ||
c0424532 YD |
1971 | static int __sys_accept4_file(struct file *file, struct sockaddr __user *upeer_sockaddr, |
1972 | int __user *upeer_addrlen, int flags) | |
d32f89da | 1973 | { |
0645fbe7 | 1974 | struct proto_accept_arg arg = { }; |
d32f89da PB |
1975 | struct file *newfile; |
1976 | int newfd; | |
1977 | ||
1978 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1979 | return -EINVAL; | |
1980 | ||
1981 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1982 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
de2ea4b6 | 1983 | |
c0424532 | 1984 | newfd = get_unused_fd_flags(flags); |
d32f89da PB |
1985 | if (unlikely(newfd < 0)) |
1986 | return newfd; | |
1987 | ||
0645fbe7 | 1988 | newfile = do_accept(file, &arg, upeer_sockaddr, upeer_addrlen, |
d32f89da PB |
1989 | flags); |
1990 | if (IS_ERR(newfile)) { | |
1991 | put_unused_fd(newfd); | |
1992 | return PTR_ERR(newfile); | |
1993 | } | |
1994 | fd_install(newfd, newfile); | |
1995 | return newfd; | |
de2ea4b6 JA |
1996 | } |
1997 | ||
1998 | /* | |
1999 | * For accept, we attempt to create a new socket, set up the link | |
2000 | * with the client, wake up the client, then return the new | |
2001 | * connected fd. We collect the address of the connector in kernel | |
2002 | * space and move it to user at the very end. This is unclean because | |
2003 | * we open the socket then return an error. | |
2004 | * | |
2005 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
2006 | * status to recvmsg. We need to add that support in a way thats | |
2007 | * clean when we restructure accept also. | |
2008 | */ | |
2009 | ||
2010 | int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, | |
2011 | int __user *upeer_addrlen, int flags) | |
2012 | { | |
2013 | int ret = -EBADF; | |
2014 | struct fd f; | |
2015 | ||
2016 | f = fdget(fd); | |
2017 | if (f.file) { | |
c0424532 YD |
2018 | ret = __sys_accept4_file(f.file, upeer_sockaddr, |
2019 | upeer_addrlen, flags); | |
6b07edeb | 2020 | fdput(f); |
de2ea4b6 JA |
2021 | } |
2022 | ||
2023 | return ret; | |
1da177e4 LT |
2024 | } |
2025 | ||
4541e805 DB |
2026 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
2027 | int __user *, upeer_addrlen, int, flags) | |
2028 | { | |
2029 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); | |
2030 | } | |
2031 | ||
20f37034 HC |
2032 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
2033 | int __user *, upeer_addrlen) | |
aaca0bdc | 2034 | { |
4541e805 | 2035 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
aaca0bdc UD |
2036 | } |
2037 | ||
1da177e4 LT |
2038 | /* |
2039 | * Attempt to connect to a socket with the server address. The address | |
2040 | * is in user space so we verify it is OK and move it to kernel space. | |
2041 | * | |
2042 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
2043 | * break bindings | |
2044 | * | |
2045 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
2046 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
2047 | * include the -EINPROGRESS status for such sockets. | |
2048 | */ | |
2049 | ||
f499a021 | 2050 | int __sys_connect_file(struct file *file, struct sockaddr_storage *address, |
bd3ded31 | 2051 | int addrlen, int file_flags) |
1da177e4 LT |
2052 | { |
2053 | struct socket *sock; | |
bd3ded31 | 2054 | int err; |
1da177e4 | 2055 | |
dba4a925 FR |
2056 | sock = sock_from_file(file); |
2057 | if (!sock) { | |
2058 | err = -ENOTSOCK; | |
1da177e4 | 2059 | goto out; |
dba4a925 | 2060 | } |
1da177e4 | 2061 | |
89bddce5 | 2062 | err = |
f499a021 | 2063 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); |
1da177e4 | 2064 | if (err) |
bd3ded31 | 2065 | goto out; |
1da177e4 | 2066 | |
1ded5e5a ED |
2067 | err = READ_ONCE(sock->ops)->connect(sock, (struct sockaddr *)address, |
2068 | addrlen, sock->file->f_flags | file_flags); | |
1da177e4 LT |
2069 | out: |
2070 | return err; | |
2071 | } | |
2072 | ||
bd3ded31 JA |
2073 | int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) |
2074 | { | |
2075 | int ret = -EBADF; | |
2076 | struct fd f; | |
2077 | ||
2078 | f = fdget(fd); | |
2079 | if (f.file) { | |
f499a021 JA |
2080 | struct sockaddr_storage address; |
2081 | ||
2082 | ret = move_addr_to_kernel(uservaddr, addrlen, &address); | |
2083 | if (!ret) | |
2084 | ret = __sys_connect_file(f.file, &address, addrlen, 0); | |
6b07edeb | 2085 | fdput(f); |
bd3ded31 JA |
2086 | } |
2087 | ||
2088 | return ret; | |
2089 | } | |
2090 | ||
1387c2c2 DB |
2091 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
2092 | int, addrlen) | |
2093 | { | |
2094 | return __sys_connect(fd, uservaddr, addrlen); | |
2095 | } | |
2096 | ||
1da177e4 LT |
2097 | /* |
2098 | * Get the local address ('name') of a socket object. Move the obtained | |
2099 | * name to user space. | |
2100 | */ | |
2101 | ||
8882a107 DB |
2102 | int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
2103 | int __user *usockaddr_len) | |
1da177e4 LT |
2104 | { |
2105 | struct socket *sock; | |
230b1839 | 2106 | struct sockaddr_storage address; |
9b2c45d4 | 2107 | int err, fput_needed; |
89bddce5 | 2108 | |
6cb153ca | 2109 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
2110 | if (!sock) |
2111 | goto out; | |
2112 | ||
2113 | err = security_socket_getsockname(sock); | |
2114 | if (err) | |
2115 | goto out_put; | |
2116 | ||
1ded5e5a | 2117 | err = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, 0); |
9b2c45d4 | 2118 | if (err < 0) |
1da177e4 | 2119 | goto out_put; |
e44ef1d4 | 2120 | /* "err" is actually length in this case */ |
9b2c45d4 | 2121 | err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); |
1da177e4 LT |
2122 | |
2123 | out_put: | |
6cb153ca | 2124 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2125 | out: |
2126 | return err; | |
2127 | } | |
2128 | ||
8882a107 DB |
2129 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
2130 | int __user *, usockaddr_len) | |
2131 | { | |
2132 | return __sys_getsockname(fd, usockaddr, usockaddr_len); | |
2133 | } | |
2134 | ||
1da177e4 LT |
2135 | /* |
2136 | * Get the remote address ('name') of a socket object. Move the obtained | |
2137 | * name to user space. | |
2138 | */ | |
2139 | ||
b21c8f83 DB |
2140 | int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
2141 | int __user *usockaddr_len) | |
1da177e4 LT |
2142 | { |
2143 | struct socket *sock; | |
230b1839 | 2144 | struct sockaddr_storage address; |
9b2c45d4 | 2145 | int err, fput_needed; |
1da177e4 | 2146 | |
89bddce5 SH |
2147 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2148 | if (sock != NULL) { | |
1ded5e5a ED |
2149 | const struct proto_ops *ops = READ_ONCE(sock->ops); |
2150 | ||
1da177e4 LT |
2151 | err = security_socket_getpeername(sock); |
2152 | if (err) { | |
6cb153ca | 2153 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2154 | return err; |
2155 | } | |
2156 | ||
1ded5e5a | 2157 | err = ops->getname(sock, (struct sockaddr *)&address, 1); |
9b2c45d4 DV |
2158 | if (err >= 0) |
2159 | /* "err" is actually length in this case */ | |
2160 | err = move_addr_to_user(&address, err, usockaddr, | |
89bddce5 | 2161 | usockaddr_len); |
6cb153ca | 2162 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2163 | } |
2164 | return err; | |
2165 | } | |
2166 | ||
b21c8f83 DB |
2167 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
2168 | int __user *, usockaddr_len) | |
2169 | { | |
2170 | return __sys_getpeername(fd, usockaddr, usockaddr_len); | |
2171 | } | |
2172 | ||
1da177e4 LT |
2173 | /* |
2174 | * Send a datagram to a given address. We move the address into kernel | |
2175 | * space and check the user space data area is readable before invoking | |
2176 | * the protocol. | |
2177 | */ | |
211b634b DB |
2178 | int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, |
2179 | struct sockaddr __user *addr, int addr_len) | |
1da177e4 LT |
2180 | { |
2181 | struct socket *sock; | |
230b1839 | 2182 | struct sockaddr_storage address; |
1da177e4 LT |
2183 | int err; |
2184 | struct msghdr msg; | |
6cb153ca | 2185 | int fput_needed; |
6cb153ca | 2186 | |
9fd7874c | 2187 | err = import_ubuf(ITER_SOURCE, buff, len, &msg.msg_iter); |
602bd0e9 AV |
2188 | if (unlikely(err)) |
2189 | return err; | |
de0fa95c PE |
2190 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2191 | if (!sock) | |
4387ff75 | 2192 | goto out; |
6cb153ca | 2193 | |
89bddce5 | 2194 | msg.msg_name = NULL; |
89bddce5 SH |
2195 | msg.msg_control = NULL; |
2196 | msg.msg_controllen = 0; | |
2197 | msg.msg_namelen = 0; | |
7c701d92 | 2198 | msg.msg_ubuf = NULL; |
6cb153ca | 2199 | if (addr) { |
43db362d | 2200 | err = move_addr_to_kernel(addr, addr_len, &address); |
1da177e4 LT |
2201 | if (err < 0) |
2202 | goto out_put; | |
230b1839 | 2203 | msg.msg_name = (struct sockaddr *)&address; |
89bddce5 | 2204 | msg.msg_namelen = addr_len; |
1da177e4 | 2205 | } |
b841b901 | 2206 | flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; |
1da177e4 LT |
2207 | if (sock->file->f_flags & O_NONBLOCK) |
2208 | flags |= MSG_DONTWAIT; | |
2209 | msg.msg_flags = flags; | |
86a7e0b6 | 2210 | err = __sock_sendmsg(sock, &msg); |
1da177e4 | 2211 | |
89bddce5 | 2212 | out_put: |
de0fa95c | 2213 | fput_light(sock->file, fput_needed); |
4387ff75 | 2214 | out: |
1da177e4 LT |
2215 | return err; |
2216 | } | |
2217 | ||
211b634b DB |
2218 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
2219 | unsigned int, flags, struct sockaddr __user *, addr, | |
2220 | int, addr_len) | |
2221 | { | |
2222 | return __sys_sendto(fd, buff, len, flags, addr, addr_len); | |
2223 | } | |
2224 | ||
1da177e4 | 2225 | /* |
89bddce5 | 2226 | * Send a datagram down a socket. |
1da177e4 LT |
2227 | */ |
2228 | ||
3e0fa65f | 2229 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
95c96174 | 2230 | unsigned int, flags) |
1da177e4 | 2231 | { |
211b634b | 2232 | return __sys_sendto(fd, buff, len, flags, NULL, 0); |
1da177e4 LT |
2233 | } |
2234 | ||
2235 | /* | |
89bddce5 | 2236 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
2237 | * sender. We verify the buffers are writable and if needed move the |
2238 | * sender address from kernel to user space. | |
2239 | */ | |
7a09e1eb DB |
2240 | int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, |
2241 | struct sockaddr __user *addr, int __user *addr_len) | |
1da177e4 | 2242 | { |
1228b34c ED |
2243 | struct sockaddr_storage address; |
2244 | struct msghdr msg = { | |
2245 | /* Save some cycles and don't copy the address if not needed */ | |
2246 | .msg_name = addr ? (struct sockaddr *)&address : NULL, | |
2247 | }; | |
1da177e4 | 2248 | struct socket *sock; |
89bddce5 | 2249 | int err, err2; |
6cb153ca BL |
2250 | int fput_needed; |
2251 | ||
9fd7874c | 2252 | err = import_ubuf(ITER_DEST, ubuf, size, &msg.msg_iter); |
602bd0e9 AV |
2253 | if (unlikely(err)) |
2254 | return err; | |
de0fa95c | 2255 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 2256 | if (!sock) |
de0fa95c | 2257 | goto out; |
1da177e4 | 2258 | |
1da177e4 LT |
2259 | if (sock->file->f_flags & O_NONBLOCK) |
2260 | flags |= MSG_DONTWAIT; | |
2da62906 | 2261 | err = sock_recvmsg(sock, &msg, flags); |
1da177e4 | 2262 | |
89bddce5 | 2263 | if (err >= 0 && addr != NULL) { |
43db362d | 2264 | err2 = move_addr_to_user(&address, |
230b1839 | 2265 | msg.msg_namelen, addr, addr_len); |
89bddce5 SH |
2266 | if (err2 < 0) |
2267 | err = err2; | |
1da177e4 | 2268 | } |
de0fa95c PE |
2269 | |
2270 | fput_light(sock->file, fput_needed); | |
4387ff75 | 2271 | out: |
1da177e4 LT |
2272 | return err; |
2273 | } | |
2274 | ||
7a09e1eb DB |
2275 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
2276 | unsigned int, flags, struct sockaddr __user *, addr, | |
2277 | int __user *, addr_len) | |
2278 | { | |
2279 | return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); | |
2280 | } | |
2281 | ||
1da177e4 | 2282 | /* |
89bddce5 | 2283 | * Receive a datagram from a socket. |
1da177e4 LT |
2284 | */ |
2285 | ||
b7c0ddf5 JG |
2286 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, |
2287 | unsigned int, flags) | |
1da177e4 | 2288 | { |
7a09e1eb | 2289 | return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1da177e4 LT |
2290 | } |
2291 | ||
83f0c10b FW |
2292 | static bool sock_use_custom_sol_socket(const struct socket *sock) |
2293 | { | |
a5ef058d | 2294 | return test_bit(SOCK_CUSTOM_SOCKOPT, &sock->flags); |
83f0c10b FW |
2295 | } |
2296 | ||
1406245c BL |
2297 | int do_sock_setsockopt(struct socket *sock, bool compat, int level, |
2298 | int optname, sockptr_t optval, int optlen) | |
1da177e4 | 2299 | { |
1ded5e5a | 2300 | const struct proto_ops *ops; |
0d01da6a | 2301 | char *kernel_optval = NULL; |
1406245c | 2302 | int err; |
1da177e4 LT |
2303 | |
2304 | if (optlen < 0) | |
2305 | return -EINVAL; | |
89bddce5 | 2306 | |
4a367299 CH |
2307 | err = security_socket_setsockopt(sock, level, optname); |
2308 | if (err) | |
2309 | goto out_put; | |
0d01da6a | 2310 | |
1406245c | 2311 | if (!compat) |
55db9c0e | 2312 | err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname, |
3f31e0d1 | 2313 | optval, &optlen, |
55db9c0e | 2314 | &kernel_optval); |
4a367299 CH |
2315 | if (err < 0) |
2316 | goto out_put; | |
2317 | if (err > 0) { | |
2318 | err = 0; | |
2319 | goto out_put; | |
2320 | } | |
0d01da6a | 2321 | |
a7b75c5a CH |
2322 | if (kernel_optval) |
2323 | optval = KERNEL_SOCKPTR(kernel_optval); | |
1ded5e5a | 2324 | ops = READ_ONCE(sock->ops); |
4a367299 | 2325 | if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock)) |
a7b75c5a | 2326 | err = sock_setsockopt(sock, level, optname, optval, optlen); |
1ded5e5a | 2327 | else if (unlikely(!ops->setsockopt)) |
a44d9e72 | 2328 | err = -EOPNOTSUPP; |
4a367299 | 2329 | else |
1ded5e5a | 2330 | err = ops->setsockopt(sock, level, optname, optval, |
89bddce5 | 2331 | optlen); |
a7b75c5a | 2332 | kfree(kernel_optval); |
4a367299 | 2333 | out_put: |
1406245c BL |
2334 | return err; |
2335 | } | |
2336 | EXPORT_SYMBOL(do_sock_setsockopt); | |
2337 | ||
2338 | /* Set a socket option. Because we don't know the option lengths we have | |
2339 | * to pass the user mode parameter for the protocols to sort out. | |
2340 | */ | |
2341 | int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval, | |
2342 | int optlen) | |
2343 | { | |
2344 | sockptr_t optval = USER_SOCKPTR(user_optval); | |
2345 | bool compat = in_compat_syscall(); | |
2346 | int err, fput_needed; | |
2347 | struct socket *sock; | |
2348 | ||
2349 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2350 | if (!sock) | |
2351 | return err; | |
2352 | ||
2353 | err = do_sock_setsockopt(sock, compat, level, optname, optval, optlen); | |
2354 | ||
4a367299 | 2355 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2356 | return err; |
2357 | } | |
2358 | ||
cc36dca0 DB |
2359 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
2360 | char __user *, optval, int, optlen) | |
2361 | { | |
2362 | return __sys_setsockopt(fd, level, optname, optval, optlen); | |
2363 | } | |
2364 | ||
9cacf81f SF |
2365 | INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level, |
2366 | int optname)); | |
2367 | ||
0b05b0cd BL |
2368 | int do_sock_getsockopt(struct socket *sock, bool compat, int level, |
2369 | int optname, sockptr_t optval, sockptr_t optlen) | |
1da177e4 | 2370 | { |
33f339a1 | 2371 | int max_optlen __maybe_unused = 0; |
1ded5e5a | 2372 | const struct proto_ops *ops; |
0b05b0cd | 2373 | int err; |
d8a9b38f CH |
2374 | |
2375 | err = security_socket_getsockopt(sock, level, optname); | |
2376 | if (err) | |
0b05b0cd | 2377 | return err; |
1da177e4 | 2378 | |
0b05b0cd | 2379 | if (!compat) |
33f339a1 | 2380 | copy_from_sockptr(&max_optlen, optlen, sizeof(int)); |
0d01da6a | 2381 | |
1ded5e5a | 2382 | ops = READ_ONCE(sock->ops); |
0b05b0cd BL |
2383 | if (level == SOL_SOCKET) { |
2384 | err = sk_getsockopt(sock->sk, level, optname, optval, optlen); | |
2385 | } else if (unlikely(!ops->getsockopt)) { | |
a44d9e72 | 2386 | err = -EOPNOTSUPP; |
0b05b0cd BL |
2387 | } else { |
2388 | if (WARN_ONCE(optval.is_kernel || optlen.is_kernel, | |
2389 | "Invalid argument type")) | |
2390 | return -EOPNOTSUPP; | |
2391 | ||
2392 | err = ops->getsockopt(sock, level, optname, optval.user, | |
2393 | optlen.user); | |
2394 | } | |
0d01da6a | 2395 | |
0b05b0cd | 2396 | if (!compat) |
55db9c0e CH |
2397 | err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, |
2398 | optval, optlen, max_optlen, | |
2399 | err); | |
0b05b0cd BL |
2400 | |
2401 | return err; | |
2402 | } | |
2403 | EXPORT_SYMBOL(do_sock_getsockopt); | |
2404 | ||
1da177e4 LT |
2405 | /* |
2406 | * Get a socket option. Because we don't know the option lengths we have | |
2407 | * to pass a user mode parameter for the protocols to sort out. | |
2408 | */ | |
55db9c0e CH |
2409 | int __sys_getsockopt(int fd, int level, int optname, char __user *optval, |
2410 | int __user *optlen) | |
1da177e4 | 2411 | { |
6cb153ca | 2412 | int err, fput_needed; |
1da177e4 | 2413 | struct socket *sock; |
0b05b0cd | 2414 | bool compat; |
1da177e4 | 2415 | |
89bddce5 | 2416 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
d8a9b38f CH |
2417 | if (!sock) |
2418 | return err; | |
2419 | ||
0b05b0cd BL |
2420 | compat = in_compat_syscall(); |
2421 | err = do_sock_getsockopt(sock, compat, level, optname, | |
2422 | USER_SOCKPTR(optval), USER_SOCKPTR(optlen)); | |
1da177e4 | 2423 | |
d8a9b38f | 2424 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2425 | return err; |
2426 | } | |
2427 | ||
13a2d70e DB |
2428 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
2429 | char __user *, optval, int __user *, optlen) | |
2430 | { | |
2431 | return __sys_getsockopt(fd, level, optname, optval, optlen); | |
2432 | } | |
2433 | ||
1da177e4 LT |
2434 | /* |
2435 | * Shutdown a socket. | |
2436 | */ | |
2437 | ||
b713c195 JA |
2438 | int __sys_shutdown_sock(struct socket *sock, int how) |
2439 | { | |
2440 | int err; | |
2441 | ||
2442 | err = security_socket_shutdown(sock, how); | |
2443 | if (!err) | |
1ded5e5a | 2444 | err = READ_ONCE(sock->ops)->shutdown(sock, how); |
b713c195 JA |
2445 | |
2446 | return err; | |
2447 | } | |
2448 | ||
005a1aea | 2449 | int __sys_shutdown(int fd, int how) |
1da177e4 | 2450 | { |
6cb153ca | 2451 | int err, fput_needed; |
1da177e4 LT |
2452 | struct socket *sock; |
2453 | ||
89bddce5 SH |
2454 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2455 | if (sock != NULL) { | |
b713c195 | 2456 | err = __sys_shutdown_sock(sock, how); |
6cb153ca | 2457 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2458 | } |
2459 | return err; | |
2460 | } | |
2461 | ||
005a1aea DB |
2462 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
2463 | { | |
2464 | return __sys_shutdown(fd, how); | |
2465 | } | |
2466 | ||
89bddce5 | 2467 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
2468 | * fields which are the same type (int / unsigned) on our platforms. |
2469 | */ | |
2470 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
2471 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
2472 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
2473 | ||
c71d8ebe TH |
2474 | struct used_address { |
2475 | struct sockaddr_storage name; | |
2476 | unsigned int name_len; | |
2477 | }; | |
2478 | ||
7fa875b8 DY |
2479 | int __copy_msghdr(struct msghdr *kmsg, |
2480 | struct user_msghdr *msg, | |
2481 | struct sockaddr __user **save_addr) | |
1661bf36 | 2482 | { |
08adb7da AV |
2483 | ssize_t err; |
2484 | ||
1f466e1f | 2485 | kmsg->msg_control_is_user = true; |
1228b34c | 2486 | kmsg->msg_get_inq = 0; |
7fa875b8 DY |
2487 | kmsg->msg_control_user = msg->msg_control; |
2488 | kmsg->msg_controllen = msg->msg_controllen; | |
2489 | kmsg->msg_flags = msg->msg_flags; | |
ffb07550 | 2490 | |
7fa875b8 DY |
2491 | kmsg->msg_namelen = msg->msg_namelen; |
2492 | if (!msg->msg_name) | |
6a2a2b3a AS |
2493 | kmsg->msg_namelen = 0; |
2494 | ||
dbb490b9 ML |
2495 | if (kmsg->msg_namelen < 0) |
2496 | return -EINVAL; | |
2497 | ||
1661bf36 | 2498 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
db31c55a | 2499 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); |
08adb7da AV |
2500 | |
2501 | if (save_addr) | |
7fa875b8 | 2502 | *save_addr = msg->msg_name; |
08adb7da | 2503 | |
7fa875b8 | 2504 | if (msg->msg_name && kmsg->msg_namelen) { |
08adb7da | 2505 | if (!save_addr) { |
7fa875b8 | 2506 | err = move_addr_to_kernel(msg->msg_name, |
864d9664 | 2507 | kmsg->msg_namelen, |
08adb7da AV |
2508 | kmsg->msg_name); |
2509 | if (err < 0) | |
2510 | return err; | |
2511 | } | |
2512 | } else { | |
2513 | kmsg->msg_name = NULL; | |
2514 | kmsg->msg_namelen = 0; | |
2515 | } | |
2516 | ||
7fa875b8 | 2517 | if (msg->msg_iovlen > UIO_MAXIOV) |
08adb7da AV |
2518 | return -EMSGSIZE; |
2519 | ||
0345f931 | 2520 | kmsg->msg_iocb = NULL; |
7c701d92 | 2521 | kmsg->msg_ubuf = NULL; |
0a384abf JA |
2522 | return 0; |
2523 | } | |
2524 | ||
2525 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
2526 | struct user_msghdr __user *umsg, | |
2527 | struct sockaddr __user **save_addr, | |
2528 | struct iovec **iov) | |
2529 | { | |
2530 | struct user_msghdr msg; | |
2531 | ssize_t err; | |
2532 | ||
7fa875b8 DY |
2533 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) |
2534 | return -EFAULT; | |
2535 | ||
2536 | err = __copy_msghdr(kmsg, &msg, save_addr); | |
0a384abf JA |
2537 | if (err) |
2538 | return err; | |
0345f931 | 2539 | |
de4eda9d | 2540 | err = import_iovec(save_addr ? ITER_DEST : ITER_SOURCE, |
ffb07550 | 2541 | msg.msg_iov, msg.msg_iovlen, |
da184284 | 2542 | UIO_FASTIOV, iov, &kmsg->msg_iter); |
87e5e6da | 2543 | return err < 0 ? err : 0; |
1661bf36 DC |
2544 | } |
2545 | ||
4257c8ca JA |
2546 | static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys, |
2547 | unsigned int flags, struct used_address *used_address, | |
2548 | unsigned int allowed_msghdr_flags) | |
1da177e4 | 2549 | { |
b9d717a7 | 2550 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
846cc123 | 2551 | __aligned(sizeof(__kernel_size_t)); |
89bddce5 | 2552 | /* 20 is size of ipv6_pktinfo */ |
1da177e4 | 2553 | unsigned char *ctl_buf = ctl; |
d8725c86 | 2554 | int ctl_len; |
08adb7da | 2555 | ssize_t err; |
89bddce5 | 2556 | |
1da177e4 LT |
2557 | err = -ENOBUFS; |
2558 | ||
228e548e | 2559 | if (msg_sys->msg_controllen > INT_MAX) |
4257c8ca | 2560 | goto out; |
28a94d8f | 2561 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); |
228e548e | 2562 | ctl_len = msg_sys->msg_controllen; |
1da177e4 | 2563 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 | 2564 | err = |
228e548e | 2565 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
89bddce5 | 2566 | sizeof(ctl)); |
1da177e4 | 2567 | if (err) |
4257c8ca | 2568 | goto out; |
228e548e AB |
2569 | ctl_buf = msg_sys->msg_control; |
2570 | ctl_len = msg_sys->msg_controllen; | |
1da177e4 | 2571 | } else if (ctl_len) { |
ac4340fc DM |
2572 | BUILD_BUG_ON(sizeof(struct cmsghdr) != |
2573 | CMSG_ALIGN(sizeof(struct cmsghdr))); | |
89bddce5 | 2574 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 2575 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 2576 | if (ctl_buf == NULL) |
4257c8ca | 2577 | goto out; |
1da177e4 LT |
2578 | } |
2579 | err = -EFAULT; | |
1f466e1f | 2580 | if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len)) |
1da177e4 | 2581 | goto out_freectl; |
228e548e | 2582 | msg_sys->msg_control = ctl_buf; |
1f466e1f | 2583 | msg_sys->msg_control_is_user = false; |
1da177e4 | 2584 | } |
b841b901 | 2585 | flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; |
228e548e | 2586 | msg_sys->msg_flags = flags; |
1da177e4 LT |
2587 | |
2588 | if (sock->file->f_flags & O_NONBLOCK) | |
228e548e | 2589 | msg_sys->msg_flags |= MSG_DONTWAIT; |
c71d8ebe TH |
2590 | /* |
2591 | * If this is sendmmsg() and current destination address is same as | |
2592 | * previously succeeded address, omit asking LSM's decision. | |
2593 | * used_address->name_len is initialized to UINT_MAX so that the first | |
2594 | * destination address never matches. | |
2595 | */ | |
bc909d9d MD |
2596 | if (used_address && msg_sys->msg_name && |
2597 | used_address->name_len == msg_sys->msg_namelen && | |
2598 | !memcmp(&used_address->name, msg_sys->msg_name, | |
c71d8ebe | 2599 | used_address->name_len)) { |
d8725c86 | 2600 | err = sock_sendmsg_nosec(sock, msg_sys); |
c71d8ebe TH |
2601 | goto out_freectl; |
2602 | } | |
86a7e0b6 | 2603 | err = __sock_sendmsg(sock, msg_sys); |
c71d8ebe TH |
2604 | /* |
2605 | * If this is sendmmsg() and sending to current destination address was | |
2606 | * successful, remember it. | |
2607 | */ | |
2608 | if (used_address && err >= 0) { | |
2609 | used_address->name_len = msg_sys->msg_namelen; | |
bc909d9d MD |
2610 | if (msg_sys->msg_name) |
2611 | memcpy(&used_address->name, msg_sys->msg_name, | |
2612 | used_address->name_len); | |
c71d8ebe | 2613 | } |
1da177e4 LT |
2614 | |
2615 | out_freectl: | |
89bddce5 | 2616 | if (ctl_buf != ctl) |
1da177e4 | 2617 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
4257c8ca JA |
2618 | out: |
2619 | return err; | |
2620 | } | |
2621 | ||
e54e09c0 JA |
2622 | static int sendmsg_copy_msghdr(struct msghdr *msg, |
2623 | struct user_msghdr __user *umsg, unsigned flags, | |
2624 | struct iovec **iov) | |
4257c8ca JA |
2625 | { |
2626 | int err; | |
2627 | ||
2628 | if (flags & MSG_CMSG_COMPAT) { | |
2629 | struct compat_msghdr __user *msg_compat; | |
2630 | ||
2631 | msg_compat = (struct compat_msghdr __user *) umsg; | |
2632 | err = get_compat_msghdr(msg, msg_compat, NULL, iov); | |
2633 | } else { | |
2634 | err = copy_msghdr_from_user(msg, umsg, NULL, iov); | |
2635 | } | |
2636 | if (err < 0) | |
2637 | return err; | |
2638 | ||
2639 | return 0; | |
2640 | } | |
2641 | ||
2642 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2643 | struct msghdr *msg_sys, unsigned int flags, | |
2644 | struct used_address *used_address, | |
2645 | unsigned int allowed_msghdr_flags) | |
2646 | { | |
2647 | struct sockaddr_storage address; | |
2648 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2649 | ssize_t err; | |
2650 | ||
2651 | msg_sys->msg_name = &address; | |
2652 | ||
2653 | err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov); | |
2654 | if (err < 0) | |
2655 | return err; | |
2656 | ||
2657 | err = ____sys_sendmsg(sock, msg_sys, flags, used_address, | |
2658 | allowed_msghdr_flags); | |
da184284 | 2659 | kfree(iov); |
228e548e AB |
2660 | return err; |
2661 | } | |
2662 | ||
2663 | /* | |
2664 | * BSD sendmsg interface | |
2665 | */ | |
03b1230c | 2666 | long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg, |
0fa03c62 JA |
2667 | unsigned int flags) |
2668 | { | |
03b1230c | 2669 | return ____sys_sendmsg(sock, msg, flags, NULL, 0); |
0fa03c62 | 2670 | } |
228e548e | 2671 | |
e1834a32 DB |
2672 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2673 | bool forbid_cmsg_compat) | |
228e548e AB |
2674 | { |
2675 | int fput_needed, err; | |
2676 | struct msghdr msg_sys; | |
1be374a0 AL |
2677 | struct socket *sock; |
2678 | ||
e1834a32 DB |
2679 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2680 | return -EINVAL; | |
2681 | ||
1be374a0 | 2682 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
228e548e AB |
2683 | if (!sock) |
2684 | goto out; | |
2685 | ||
28a94d8f | 2686 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); |
228e548e | 2687 | |
6cb153ca | 2688 | fput_light(sock->file, fput_needed); |
89bddce5 | 2689 | out: |
1da177e4 LT |
2690 | return err; |
2691 | } | |
2692 | ||
666547ff | 2693 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) |
a7526eb5 | 2694 | { |
e1834a32 | 2695 | return __sys_sendmsg(fd, msg, flags, true); |
a7526eb5 AL |
2696 | } |
2697 | ||
228e548e AB |
2698 | /* |
2699 | * Linux sendmmsg interface | |
2700 | */ | |
2701 | ||
2702 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
e1834a32 | 2703 | unsigned int flags, bool forbid_cmsg_compat) |
228e548e AB |
2704 | { |
2705 | int fput_needed, err, datagrams; | |
2706 | struct socket *sock; | |
2707 | struct mmsghdr __user *entry; | |
2708 | struct compat_mmsghdr __user *compat_entry; | |
2709 | struct msghdr msg_sys; | |
c71d8ebe | 2710 | struct used_address used_address; |
f092276d | 2711 | unsigned int oflags = flags; |
228e548e | 2712 | |
e1834a32 DB |
2713 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2714 | return -EINVAL; | |
2715 | ||
98382f41 AB |
2716 | if (vlen > UIO_MAXIOV) |
2717 | vlen = UIO_MAXIOV; | |
228e548e AB |
2718 | |
2719 | datagrams = 0; | |
2720 | ||
2721 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2722 | if (!sock) | |
2723 | return err; | |
2724 | ||
c71d8ebe | 2725 | used_address.name_len = UINT_MAX; |
228e548e AB |
2726 | entry = mmsg; |
2727 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
728ffb86 | 2728 | err = 0; |
f092276d | 2729 | flags |= MSG_BATCH; |
228e548e AB |
2730 | |
2731 | while (datagrams < vlen) { | |
f092276d TH |
2732 | if (datagrams == vlen - 1) |
2733 | flags = oflags; | |
2734 | ||
228e548e | 2735 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2736 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, |
28a94d8f | 2737 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2738 | if (err < 0) |
2739 | break; | |
2740 | err = __put_user(err, &compat_entry->msg_len); | |
2741 | ++compat_entry; | |
2742 | } else { | |
a7526eb5 | 2743 | err = ___sys_sendmsg(sock, |
666547ff | 2744 | (struct user_msghdr __user *)entry, |
28a94d8f | 2745 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2746 | if (err < 0) |
2747 | break; | |
2748 | err = put_user(err, &entry->msg_len); | |
2749 | ++entry; | |
2750 | } | |
2751 | ||
2752 | if (err) | |
2753 | break; | |
2754 | ++datagrams; | |
3023898b SHY |
2755 | if (msg_data_left(&msg_sys)) |
2756 | break; | |
a78cb84c | 2757 | cond_resched(); |
228e548e AB |
2758 | } |
2759 | ||
228e548e AB |
2760 | fput_light(sock->file, fput_needed); |
2761 | ||
728ffb86 AB |
2762 | /* We only return an error if no datagrams were able to be sent */ |
2763 | if (datagrams != 0) | |
228e548e AB |
2764 | return datagrams; |
2765 | ||
228e548e AB |
2766 | return err; |
2767 | } | |
2768 | ||
2769 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2770 | unsigned int, vlen, unsigned int, flags) | |
2771 | { | |
e1834a32 | 2772 | return __sys_sendmmsg(fd, mmsg, vlen, flags, true); |
228e548e AB |
2773 | } |
2774 | ||
e54e09c0 JA |
2775 | static int recvmsg_copy_msghdr(struct msghdr *msg, |
2776 | struct user_msghdr __user *umsg, unsigned flags, | |
2777 | struct sockaddr __user **uaddr, | |
2778 | struct iovec **iov) | |
1da177e4 | 2779 | { |
08adb7da | 2780 | ssize_t err; |
1da177e4 | 2781 | |
4257c8ca JA |
2782 | if (MSG_CMSG_COMPAT & flags) { |
2783 | struct compat_msghdr __user *msg_compat; | |
1da177e4 | 2784 | |
4257c8ca JA |
2785 | msg_compat = (struct compat_msghdr __user *) umsg; |
2786 | err = get_compat_msghdr(msg, msg_compat, uaddr, iov); | |
2787 | } else { | |
2788 | err = copy_msghdr_from_user(msg, umsg, uaddr, iov); | |
2789 | } | |
1da177e4 | 2790 | if (err < 0) |
da184284 | 2791 | return err; |
1da177e4 | 2792 | |
4257c8ca JA |
2793 | return 0; |
2794 | } | |
2795 | ||
2796 | static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys, | |
2797 | struct user_msghdr __user *msg, | |
2798 | struct sockaddr __user *uaddr, | |
2799 | unsigned int flags, int nosec) | |
2800 | { | |
2801 | struct compat_msghdr __user *msg_compat = | |
2802 | (struct compat_msghdr __user *) msg; | |
2803 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2804 | struct sockaddr_storage addr; | |
2805 | unsigned long cmsg_ptr; | |
2806 | int len; | |
2807 | ssize_t err; | |
2808 | ||
2809 | msg_sys->msg_name = &addr; | |
a2e27255 ACM |
2810 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
2811 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
89bddce5 | 2812 | |
f3d33426 HFS |
2813 | /* We assume all kernel code knows the size of sockaddr_storage */ |
2814 | msg_sys->msg_namelen = 0; | |
2815 | ||
1da177e4 LT |
2816 | if (sock->file->f_flags & O_NONBLOCK) |
2817 | flags |= MSG_DONTWAIT; | |
1af66221 ED |
2818 | |
2819 | if (unlikely(nosec)) | |
2820 | err = sock_recvmsg_nosec(sock, msg_sys, flags); | |
2821 | else | |
2822 | err = sock_recvmsg(sock, msg_sys, flags); | |
2823 | ||
1da177e4 | 2824 | if (err < 0) |
4257c8ca | 2825 | goto out; |
1da177e4 LT |
2826 | len = err; |
2827 | ||
2828 | if (uaddr != NULL) { | |
43db362d | 2829 | err = move_addr_to_user(&addr, |
a2e27255 | 2830 | msg_sys->msg_namelen, uaddr, |
89bddce5 | 2831 | uaddr_len); |
1da177e4 | 2832 | if (err < 0) |
4257c8ca | 2833 | goto out; |
1da177e4 | 2834 | } |
a2e27255 | 2835 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
37f7f421 | 2836 | COMPAT_FLAGS(msg)); |
1da177e4 | 2837 | if (err) |
4257c8ca | 2838 | goto out; |
1da177e4 | 2839 | if (MSG_CMSG_COMPAT & flags) |
a2e27255 | 2840 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2841 | &msg_compat->msg_controllen); |
2842 | else | |
a2e27255 | 2843 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2844 | &msg->msg_controllen); |
2845 | if (err) | |
4257c8ca | 2846 | goto out; |
1da177e4 | 2847 | err = len; |
4257c8ca JA |
2848 | out: |
2849 | return err; | |
2850 | } | |
2851 | ||
2852 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2853 | struct msghdr *msg_sys, unsigned int flags, int nosec) | |
2854 | { | |
2855 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2856 | /* user mode address pointers */ | |
2857 | struct sockaddr __user *uaddr; | |
2858 | ssize_t err; | |
2859 | ||
2860 | err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov); | |
2861 | if (err < 0) | |
2862 | return err; | |
1da177e4 | 2863 | |
4257c8ca | 2864 | err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec); |
da184284 | 2865 | kfree(iov); |
a2e27255 ACM |
2866 | return err; |
2867 | } | |
2868 | ||
2869 | /* | |
2870 | * BSD recvmsg interface | |
2871 | */ | |
2872 | ||
03b1230c JA |
2873 | long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg, |
2874 | struct user_msghdr __user *umsg, | |
2875 | struct sockaddr __user *uaddr, unsigned int flags) | |
aa1fa28f | 2876 | { |
03b1230c | 2877 | return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0); |
aa1fa28f JA |
2878 | } |
2879 | ||
e1834a32 DB |
2880 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2881 | bool forbid_cmsg_compat) | |
a2e27255 ACM |
2882 | { |
2883 | int fput_needed, err; | |
2884 | struct msghdr msg_sys; | |
1be374a0 AL |
2885 | struct socket *sock; |
2886 | ||
e1834a32 DB |
2887 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2888 | return -EINVAL; | |
2889 | ||
1be374a0 | 2890 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
a2e27255 ACM |
2891 | if (!sock) |
2892 | goto out; | |
2893 | ||
a7526eb5 | 2894 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
a2e27255 | 2895 | |
6cb153ca | 2896 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2897 | out: |
2898 | return err; | |
2899 | } | |
2900 | ||
666547ff | 2901 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, |
a7526eb5 AL |
2902 | unsigned int, flags) |
2903 | { | |
e1834a32 | 2904 | return __sys_recvmsg(fd, msg, flags, true); |
a7526eb5 AL |
2905 | } |
2906 | ||
a2e27255 ACM |
2907 | /* |
2908 | * Linux recvmmsg interface | |
2909 | */ | |
2910 | ||
e11d4284 AB |
2911 | static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2912 | unsigned int vlen, unsigned int flags, | |
2913 | struct timespec64 *timeout) | |
a2e27255 ACM |
2914 | { |
2915 | int fput_needed, err, datagrams; | |
2916 | struct socket *sock; | |
2917 | struct mmsghdr __user *entry; | |
d7256d0e | 2918 | struct compat_mmsghdr __user *compat_entry; |
a2e27255 | 2919 | struct msghdr msg_sys; |
766b9f92 DD |
2920 | struct timespec64 end_time; |
2921 | struct timespec64 timeout64; | |
a2e27255 ACM |
2922 | |
2923 | if (timeout && | |
2924 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2925 | timeout->tv_nsec)) | |
2926 | return -EINVAL; | |
2927 | ||
2928 | datagrams = 0; | |
2929 | ||
2930 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2931 | if (!sock) | |
2932 | return err; | |
2933 | ||
7797dc41 SHY |
2934 | if (likely(!(flags & MSG_ERRQUEUE))) { |
2935 | err = sock_error(sock->sk); | |
2936 | if (err) { | |
2937 | datagrams = err; | |
2938 | goto out_put; | |
2939 | } | |
e623a9e9 | 2940 | } |
a2e27255 ACM |
2941 | |
2942 | entry = mmsg; | |
d7256d0e | 2943 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
a2e27255 ACM |
2944 | |
2945 | while (datagrams < vlen) { | |
2946 | /* | |
2947 | * No need to ask LSM for more than the first datagram. | |
2948 | */ | |
d7256d0e | 2949 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2950 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, |
a7526eb5 AL |
2951 | &msg_sys, flags & ~MSG_WAITFORONE, |
2952 | datagrams); | |
d7256d0e JMG |
2953 | if (err < 0) |
2954 | break; | |
2955 | err = __put_user(err, &compat_entry->msg_len); | |
2956 | ++compat_entry; | |
2957 | } else { | |
a7526eb5 | 2958 | err = ___sys_recvmsg(sock, |
666547ff | 2959 | (struct user_msghdr __user *)entry, |
a7526eb5 AL |
2960 | &msg_sys, flags & ~MSG_WAITFORONE, |
2961 | datagrams); | |
d7256d0e JMG |
2962 | if (err < 0) |
2963 | break; | |
2964 | err = put_user(err, &entry->msg_len); | |
2965 | ++entry; | |
2966 | } | |
2967 | ||
a2e27255 ACM |
2968 | if (err) |
2969 | break; | |
a2e27255 ACM |
2970 | ++datagrams; |
2971 | ||
71c5c159 BB |
2972 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
2973 | if (flags & MSG_WAITFORONE) | |
2974 | flags |= MSG_DONTWAIT; | |
2975 | ||
a2e27255 | 2976 | if (timeout) { |
766b9f92 | 2977 | ktime_get_ts64(&timeout64); |
c2e6c856 | 2978 | *timeout = timespec64_sub(end_time, timeout64); |
a2e27255 ACM |
2979 | if (timeout->tv_sec < 0) { |
2980 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2981 | break; | |
2982 | } | |
2983 | ||
2984 | /* Timeout, return less than vlen datagrams */ | |
2985 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2986 | break; | |
2987 | } | |
2988 | ||
2989 | /* Out of band data, return right away */ | |
2990 | if (msg_sys.msg_flags & MSG_OOB) | |
2991 | break; | |
a78cb84c | 2992 | cond_resched(); |
a2e27255 ACM |
2993 | } |
2994 | ||
a2e27255 | 2995 | if (err == 0) |
34b88a68 ACM |
2996 | goto out_put; |
2997 | ||
2998 | if (datagrams == 0) { | |
2999 | datagrams = err; | |
3000 | goto out_put; | |
3001 | } | |
a2e27255 | 3002 | |
34b88a68 ACM |
3003 | /* |
3004 | * We may return less entries than requested (vlen) if the | |
3005 | * sock is non block and there aren't enough datagrams... | |
3006 | */ | |
3007 | if (err != -EAGAIN) { | |
a2e27255 | 3008 | /* |
34b88a68 ACM |
3009 | * ... or if recvmsg returns an error after we |
3010 | * received some datagrams, where we record the | |
3011 | * error to return on the next call or if the | |
3012 | * app asks about it using getsockopt(SO_ERROR). | |
a2e27255 | 3013 | */ |
e05a5f51 | 3014 | WRITE_ONCE(sock->sk->sk_err, -err); |
a2e27255 | 3015 | } |
34b88a68 ACM |
3016 | out_put: |
3017 | fput_light(sock->file, fput_needed); | |
a2e27255 | 3018 | |
34b88a68 | 3019 | return datagrams; |
a2e27255 ACM |
3020 | } |
3021 | ||
e11d4284 AB |
3022 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
3023 | unsigned int vlen, unsigned int flags, | |
3024 | struct __kernel_timespec __user *timeout, | |
3025 | struct old_timespec32 __user *timeout32) | |
a2e27255 ACM |
3026 | { |
3027 | int datagrams; | |
c2e6c856 | 3028 | struct timespec64 timeout_sys; |
a2e27255 | 3029 | |
e11d4284 AB |
3030 | if (timeout && get_timespec64(&timeout_sys, timeout)) |
3031 | return -EFAULT; | |
a2e27255 | 3032 | |
e11d4284 | 3033 | if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) |
a2e27255 ACM |
3034 | return -EFAULT; |
3035 | ||
e11d4284 AB |
3036 | if (!timeout && !timeout32) |
3037 | return do_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
3038 | ||
3039 | datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
a2e27255 | 3040 | |
e11d4284 AB |
3041 | if (datagrams <= 0) |
3042 | return datagrams; | |
3043 | ||
3044 | if (timeout && put_timespec64(&timeout_sys, timeout)) | |
3045 | datagrams = -EFAULT; | |
3046 | ||
3047 | if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) | |
a2e27255 ACM |
3048 | datagrams = -EFAULT; |
3049 | ||
3050 | return datagrams; | |
3051 | } | |
3052 | ||
1255e269 DB |
3053 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
3054 | unsigned int, vlen, unsigned int, flags, | |
c2e6c856 | 3055 | struct __kernel_timespec __user *, timeout) |
1255e269 | 3056 | { |
e11d4284 AB |
3057 | if (flags & MSG_CMSG_COMPAT) |
3058 | return -EINVAL; | |
3059 | ||
3060 | return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); | |
3061 | } | |
3062 | ||
3063 | #ifdef CONFIG_COMPAT_32BIT_TIME | |
3064 | SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, | |
3065 | unsigned int, vlen, unsigned int, flags, | |
3066 | struct old_timespec32 __user *, timeout) | |
3067 | { | |
3068 | if (flags & MSG_CMSG_COMPAT) | |
3069 | return -EINVAL; | |
3070 | ||
3071 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); | |
1255e269 | 3072 | } |
e11d4284 | 3073 | #endif |
1255e269 | 3074 | |
a2e27255 | 3075 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
1da177e4 LT |
3076 | /* Argument list sizes for sys_socketcall */ |
3077 | #define AL(x) ((x) * sizeof(unsigned long)) | |
228e548e | 3078 | static const unsigned char nargs[21] = { |
c6d409cf ED |
3079 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
3080 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
3081 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
228e548e | 3082 | AL(4), AL(5), AL(4) |
89bddce5 SH |
3083 | }; |
3084 | ||
1da177e4 LT |
3085 | #undef AL |
3086 | ||
3087 | /* | |
89bddce5 | 3088 | * System call vectors. |
1da177e4 LT |
3089 | * |
3090 | * Argument checking cleaned up. Saved 20% in size. | |
3091 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 3092 | * it is set by the callees. |
1da177e4 LT |
3093 | */ |
3094 | ||
3e0fa65f | 3095 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
1da177e4 | 3096 | { |
2950fa9d | 3097 | unsigned long a[AUDITSC_ARGS]; |
89bddce5 | 3098 | unsigned long a0, a1; |
1da177e4 | 3099 | int err; |
47379052 | 3100 | unsigned int len; |
1da177e4 | 3101 | |
228e548e | 3102 | if (call < 1 || call > SYS_SENDMMSG) |
1da177e4 | 3103 | return -EINVAL; |
c8e8cd57 | 3104 | call = array_index_nospec(call, SYS_SENDMMSG + 1); |
1da177e4 | 3105 | |
47379052 AV |
3106 | len = nargs[call]; |
3107 | if (len > sizeof(a)) | |
3108 | return -EINVAL; | |
3109 | ||
1da177e4 | 3110 | /* copy_from_user should be SMP safe. */ |
47379052 | 3111 | if (copy_from_user(a, args, len)) |
1da177e4 | 3112 | return -EFAULT; |
3ec3b2fb | 3113 | |
2950fa9d CG |
3114 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
3115 | if (err) | |
3116 | return err; | |
3ec3b2fb | 3117 | |
89bddce5 SH |
3118 | a0 = a[0]; |
3119 | a1 = a[1]; | |
3120 | ||
3121 | switch (call) { | |
3122 | case SYS_SOCKET: | |
9d6a15c3 | 3123 | err = __sys_socket(a0, a1, a[2]); |
89bddce5 SH |
3124 | break; |
3125 | case SYS_BIND: | |
a87d35d8 | 3126 | err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
3127 | break; |
3128 | case SYS_CONNECT: | |
1387c2c2 | 3129 | err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
3130 | break; |
3131 | case SYS_LISTEN: | |
25e290ee | 3132 | err = __sys_listen(a0, a1); |
89bddce5 SH |
3133 | break; |
3134 | case SYS_ACCEPT: | |
4541e805 DB |
3135 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
3136 | (int __user *)a[2], 0); | |
89bddce5 SH |
3137 | break; |
3138 | case SYS_GETSOCKNAME: | |
3139 | err = | |
8882a107 DB |
3140 | __sys_getsockname(a0, (struct sockaddr __user *)a1, |
3141 | (int __user *)a[2]); | |
89bddce5 SH |
3142 | break; |
3143 | case SYS_GETPEERNAME: | |
3144 | err = | |
b21c8f83 DB |
3145 | __sys_getpeername(a0, (struct sockaddr __user *)a1, |
3146 | (int __user *)a[2]); | |
89bddce5 SH |
3147 | break; |
3148 | case SYS_SOCKETPAIR: | |
6debc8d8 | 3149 | err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
89bddce5 SH |
3150 | break; |
3151 | case SYS_SEND: | |
f3bf896b DB |
3152 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
3153 | NULL, 0); | |
89bddce5 SH |
3154 | break; |
3155 | case SYS_SENDTO: | |
211b634b DB |
3156 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
3157 | (struct sockaddr __user *)a[4], a[5]); | |
89bddce5 SH |
3158 | break; |
3159 | case SYS_RECV: | |
d27e9afc DB |
3160 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
3161 | NULL, NULL); | |
89bddce5 SH |
3162 | break; |
3163 | case SYS_RECVFROM: | |
7a09e1eb DB |
3164 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
3165 | (struct sockaddr __user *)a[4], | |
3166 | (int __user *)a[5]); | |
89bddce5 SH |
3167 | break; |
3168 | case SYS_SHUTDOWN: | |
005a1aea | 3169 | err = __sys_shutdown(a0, a1); |
89bddce5 SH |
3170 | break; |
3171 | case SYS_SETSOCKOPT: | |
cc36dca0 DB |
3172 | err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], |
3173 | a[4]); | |
89bddce5 SH |
3174 | break; |
3175 | case SYS_GETSOCKOPT: | |
3176 | err = | |
13a2d70e DB |
3177 | __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
3178 | (int __user *)a[4]); | |
89bddce5 SH |
3179 | break; |
3180 | case SYS_SENDMSG: | |
e1834a32 DB |
3181 | err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, |
3182 | a[2], true); | |
89bddce5 | 3183 | break; |
228e548e | 3184 | case SYS_SENDMMSG: |
e1834a32 DB |
3185 | err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], |
3186 | a[3], true); | |
228e548e | 3187 | break; |
89bddce5 | 3188 | case SYS_RECVMSG: |
e1834a32 DB |
3189 | err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, |
3190 | a[2], true); | |
89bddce5 | 3191 | break; |
a2e27255 | 3192 | case SYS_RECVMMSG: |
3ca47e95 | 3193 | if (IS_ENABLED(CONFIG_64BIT)) |
e11d4284 AB |
3194 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, |
3195 | a[2], a[3], | |
3196 | (struct __kernel_timespec __user *)a[4], | |
3197 | NULL); | |
3198 | else | |
3199 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, | |
3200 | a[2], a[3], NULL, | |
3201 | (struct old_timespec32 __user *)a[4]); | |
a2e27255 | 3202 | break; |
de11defe | 3203 | case SYS_ACCEPT4: |
4541e805 DB |
3204 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
3205 | (int __user *)a[2], a[3]); | |
aaca0bdc | 3206 | break; |
89bddce5 SH |
3207 | default: |
3208 | err = -EINVAL; | |
3209 | break; | |
1da177e4 LT |
3210 | } |
3211 | return err; | |
3212 | } | |
3213 | ||
89bddce5 | 3214 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 3215 | |
55737fda SH |
3216 | /** |
3217 | * sock_register - add a socket protocol handler | |
3218 | * @ops: description of protocol | |
3219 | * | |
1da177e4 LT |
3220 | * This function is called by a protocol handler that wants to |
3221 | * advertise its address family, and have it linked into the | |
e793c0f7 | 3222 | * socket interface. The value ops->family corresponds to the |
55737fda | 3223 | * socket system call protocol family. |
1da177e4 | 3224 | */ |
f0fd27d4 | 3225 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
3226 | { |
3227 | int err; | |
3228 | ||
3229 | if (ops->family >= NPROTO) { | |
3410f22e | 3230 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
1da177e4 LT |
3231 | return -ENOBUFS; |
3232 | } | |
55737fda SH |
3233 | |
3234 | spin_lock(&net_family_lock); | |
190683a9 ED |
3235 | if (rcu_dereference_protected(net_families[ops->family], |
3236 | lockdep_is_held(&net_family_lock))) | |
55737fda SH |
3237 | err = -EEXIST; |
3238 | else { | |
cf778b00 | 3239 | rcu_assign_pointer(net_families[ops->family], ops); |
1da177e4 LT |
3240 | err = 0; |
3241 | } | |
55737fda SH |
3242 | spin_unlock(&net_family_lock); |
3243 | ||
fe0bdbde | 3244 | pr_info("NET: Registered %s protocol family\n", pf_family_names[ops->family]); |
1da177e4 LT |
3245 | return err; |
3246 | } | |
c6d409cf | 3247 | EXPORT_SYMBOL(sock_register); |
1da177e4 | 3248 | |
55737fda SH |
3249 | /** |
3250 | * sock_unregister - remove a protocol handler | |
3251 | * @family: protocol family to remove | |
3252 | * | |
1da177e4 LT |
3253 | * This function is called by a protocol handler that wants to |
3254 | * remove its address family, and have it unlinked from the | |
55737fda SH |
3255 | * new socket creation. |
3256 | * | |
3257 | * If protocol handler is a module, then it can use module reference | |
3258 | * counts to protect against new references. If protocol handler is not | |
3259 | * a module then it needs to provide its own protection in | |
3260 | * the ops->create routine. | |
1da177e4 | 3261 | */ |
f0fd27d4 | 3262 | void sock_unregister(int family) |
1da177e4 | 3263 | { |
f0fd27d4 | 3264 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 3265 | |
55737fda | 3266 | spin_lock(&net_family_lock); |
a9b3cd7f | 3267 | RCU_INIT_POINTER(net_families[family], NULL); |
55737fda SH |
3268 | spin_unlock(&net_family_lock); |
3269 | ||
3270 | synchronize_rcu(); | |
3271 | ||
fe0bdbde | 3272 | pr_info("NET: Unregistered %s protocol family\n", pf_family_names[family]); |
1da177e4 | 3273 | } |
c6d409cf | 3274 | EXPORT_SYMBOL(sock_unregister); |
1da177e4 | 3275 | |
bf2ae2e4 XL |
3276 | bool sock_is_registered(int family) |
3277 | { | |
66b51b0a | 3278 | return family < NPROTO && rcu_access_pointer(net_families[family]); |
bf2ae2e4 XL |
3279 | } |
3280 | ||
77d76ea3 | 3281 | static int __init sock_init(void) |
1da177e4 | 3282 | { |
b3e19d92 | 3283 | int err; |
2ca794e5 EB |
3284 | /* |
3285 | * Initialize the network sysctl infrastructure. | |
3286 | */ | |
3287 | err = net_sysctl_init(); | |
3288 | if (err) | |
3289 | goto out; | |
b3e19d92 | 3290 | |
1da177e4 | 3291 | /* |
89bddce5 | 3292 | * Initialize skbuff SLAB cache |
1da177e4 LT |
3293 | */ |
3294 | skb_init(); | |
1da177e4 LT |
3295 | |
3296 | /* | |
89bddce5 | 3297 | * Initialize the protocols module. |
1da177e4 LT |
3298 | */ |
3299 | ||
3300 | init_inodecache(); | |
b3e19d92 NP |
3301 | |
3302 | err = register_filesystem(&sock_fs_type); | |
3303 | if (err) | |
47260ba9 | 3304 | goto out; |
1da177e4 | 3305 | sock_mnt = kern_mount(&sock_fs_type); |
b3e19d92 NP |
3306 | if (IS_ERR(sock_mnt)) { |
3307 | err = PTR_ERR(sock_mnt); | |
3308 | goto out_mount; | |
3309 | } | |
77d76ea3 AK |
3310 | |
3311 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
3312 | */ |
3313 | ||
3314 | #ifdef CONFIG_NETFILTER | |
6d11cfdb PNA |
3315 | err = netfilter_init(); |
3316 | if (err) | |
3317 | goto out; | |
1da177e4 | 3318 | #endif |
cbeb321a | 3319 | |
408eccce | 3320 | ptp_classifier_init(); |
c1f19b51 | 3321 | |
b3e19d92 NP |
3322 | out: |
3323 | return err; | |
3324 | ||
3325 | out_mount: | |
3326 | unregister_filesystem(&sock_fs_type); | |
b3e19d92 | 3327 | goto out; |
1da177e4 LT |
3328 | } |
3329 | ||
77d76ea3 AK |
3330 | core_initcall(sock_init); /* early initcall */ |
3331 | ||
1da177e4 LT |
3332 | #ifdef CONFIG_PROC_FS |
3333 | void socket_seq_show(struct seq_file *seq) | |
3334 | { | |
648845ab TZ |
3335 | seq_printf(seq, "sockets: used %d\n", |
3336 | sock_inuse_get(seq->private)); | |
1da177e4 | 3337 | } |
89bddce5 | 3338 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 3339 | |
29c49648 AB |
3340 | /* Handle the fact that while struct ifreq has the same *layout* on |
3341 | * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, | |
3342 | * which are handled elsewhere, it still has different *size* due to | |
3343 | * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, | |
3344 | * resulting in struct ifreq being 32 and 40 bytes respectively). | |
3345 | * As a result, if the struct happens to be at the end of a page and | |
3346 | * the next page isn't readable/writable, we get a fault. To prevent | |
3347 | * that, copy back and forth to the full size. | |
3348 | */ | |
3349 | int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg) | |
7a229387 | 3350 | { |
29c49648 AB |
3351 | if (in_compat_syscall()) { |
3352 | struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr; | |
7a229387 | 3353 | |
29c49648 AB |
3354 | memset(ifr, 0, sizeof(*ifr)); |
3355 | if (copy_from_user(ifr32, arg, sizeof(*ifr32))) | |
3356 | return -EFAULT; | |
7a229387 | 3357 | |
29c49648 AB |
3358 | if (ifrdata) |
3359 | *ifrdata = compat_ptr(ifr32->ifr_data); | |
7a229387 | 3360 | |
29c49648 AB |
3361 | return 0; |
3362 | } | |
7a229387 | 3363 | |
29c49648 | 3364 | if (copy_from_user(ifr, arg, sizeof(*ifr))) |
7a229387 AB |
3365 | return -EFAULT; |
3366 | ||
29c49648 AB |
3367 | if (ifrdata) |
3368 | *ifrdata = ifr->ifr_data; | |
3369 | ||
7a229387 AB |
3370 | return 0; |
3371 | } | |
29c49648 | 3372 | EXPORT_SYMBOL(get_user_ifreq); |
7a229387 | 3373 | |
29c49648 | 3374 | int put_user_ifreq(struct ifreq *ifr, void __user *arg) |
7a229387 | 3375 | { |
29c49648 | 3376 | size_t size = sizeof(*ifr); |
7a229387 | 3377 | |
29c49648 AB |
3378 | if (in_compat_syscall()) |
3379 | size = sizeof(struct compat_ifreq); | |
7a229387 | 3380 | |
29c49648 | 3381 | if (copy_to_user(arg, ifr, size)) |
7a229387 AB |
3382 | return -EFAULT; |
3383 | ||
3a7da39d | 3384 | return 0; |
7a229387 | 3385 | } |
29c49648 | 3386 | EXPORT_SYMBOL(put_user_ifreq); |
7a229387 | 3387 | |
89bbfc95 | 3388 | #ifdef CONFIG_COMPAT |
7a50a240 AB |
3389 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
3390 | { | |
7a50a240 | 3391 | compat_uptr_t uptr32; |
44c02a2c AV |
3392 | struct ifreq ifr; |
3393 | void __user *saved; | |
3394 | int err; | |
7a50a240 | 3395 | |
29c49648 | 3396 | if (get_user_ifreq(&ifr, NULL, uifr32)) |
7a50a240 AB |
3397 | return -EFAULT; |
3398 | ||
3399 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
3400 | return -EFAULT; | |
3401 | ||
44c02a2c AV |
3402 | saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; |
3403 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); | |
7a229387 | 3404 | |
a554bf96 | 3405 | err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL, NULL); |
44c02a2c AV |
3406 | if (!err) { |
3407 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; | |
29c49648 | 3408 | if (put_user_ifreq(&ifr, uifr32)) |
44c02a2c | 3409 | err = -EFAULT; |
ccbd6a5a | 3410 | } |
44c02a2c | 3411 | return err; |
7a229387 AB |
3412 | } |
3413 | ||
590d4693 BH |
3414 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ |
3415 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
6b96018b | 3416 | struct compat_ifreq __user *u_ifreq32) |
7a229387 | 3417 | { |
44c02a2c | 3418 | struct ifreq ifreq; |
a554bf96 | 3419 | void __user *data; |
7a229387 | 3420 | |
d0efb162 PC |
3421 | if (!is_socket_ioctl_cmd(cmd)) |
3422 | return -ENOTTY; | |
a554bf96 | 3423 | if (get_user_ifreq(&ifreq, &data, u_ifreq32)) |
7a229387 | 3424 | return -EFAULT; |
a554bf96 | 3425 | ifreq.ifr_data = data; |
7a229387 | 3426 | |
a554bf96 | 3427 | return dev_ioctl(net, cmd, &ifreq, data, NULL); |
a2116ed2 AB |
3428 | } |
3429 | ||
6b96018b AB |
3430 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
3431 | unsigned int cmd, unsigned long arg) | |
3432 | { | |
3433 | void __user *argp = compat_ptr(arg); | |
3434 | struct sock *sk = sock->sk; | |
3435 | struct net *net = sock_net(sk); | |
1ded5e5a | 3436 | const struct proto_ops *ops; |
7a229387 | 3437 | |
6b96018b | 3438 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
88fc023f | 3439 | return sock_ioctl(file, cmd, (unsigned long)argp); |
6b96018b AB |
3440 | |
3441 | switch (cmd) { | |
7a50a240 AB |
3442 | case SIOCWANDEV: |
3443 | return compat_siocwandev(net, argp); | |
0768e170 AB |
3444 | case SIOCGSTAMP_OLD: |
3445 | case SIOCGSTAMPNS_OLD: | |
1ded5e5a ED |
3446 | ops = READ_ONCE(sock->ops); |
3447 | if (!ops->gettstamp) | |
c7cbdbf2 | 3448 | return -ENOIOCTLCMD; |
1ded5e5a ED |
3449 | return ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, |
3450 | !COMPAT_USE_64BIT_TIME); | |
c7cbdbf2 | 3451 | |
dd98d289 | 3452 | case SIOCETHTOOL: |
590d4693 BH |
3453 | case SIOCBONDSLAVEINFOQUERY: |
3454 | case SIOCBONDINFOQUERY: | |
a2116ed2 | 3455 | case SIOCSHWTSTAMP: |
fd468c74 | 3456 | case SIOCGHWTSTAMP: |
590d4693 | 3457 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3458 | |
3459 | case FIOSETOWN: | |
3460 | case SIOCSPGRP: | |
3461 | case FIOGETOWN: | |
3462 | case SIOCGPGRP: | |
3463 | case SIOCBRADDBR: | |
3464 | case SIOCBRDELBR: | |
3465 | case SIOCGIFVLAN: | |
3466 | case SIOCSIFVLAN: | |
c62cce2c | 3467 | case SIOCGSKNS: |
0768e170 AB |
3468 | case SIOCGSTAMP_NEW: |
3469 | case SIOCGSTAMPNS_NEW: | |
876f0bf9 | 3470 | case SIOCGIFCONF: |
fd3a4590 RP |
3471 | case SIOCSIFBR: |
3472 | case SIOCGIFBR: | |
6b96018b AB |
3473 | return sock_ioctl(file, cmd, arg); |
3474 | ||
3475 | case SIOCGIFFLAGS: | |
3476 | case SIOCSIFFLAGS: | |
709566d7 AB |
3477 | case SIOCGIFMAP: |
3478 | case SIOCSIFMAP: | |
6b96018b AB |
3479 | case SIOCGIFMETRIC: |
3480 | case SIOCSIFMETRIC: | |
3481 | case SIOCGIFMTU: | |
3482 | case SIOCSIFMTU: | |
3483 | case SIOCGIFMEM: | |
3484 | case SIOCSIFMEM: | |
3485 | case SIOCGIFHWADDR: | |
3486 | case SIOCSIFHWADDR: | |
3487 | case SIOCADDMULTI: | |
3488 | case SIOCDELMULTI: | |
3489 | case SIOCGIFINDEX: | |
6b96018b AB |
3490 | case SIOCGIFADDR: |
3491 | case SIOCSIFADDR: | |
3492 | case SIOCSIFHWBROADCAST: | |
6b96018b | 3493 | case SIOCDIFADDR: |
6b96018b AB |
3494 | case SIOCGIFBRDADDR: |
3495 | case SIOCSIFBRDADDR: | |
3496 | case SIOCGIFDSTADDR: | |
3497 | case SIOCSIFDSTADDR: | |
3498 | case SIOCGIFNETMASK: | |
3499 | case SIOCSIFNETMASK: | |
3500 | case SIOCSIFPFLAGS: | |
3501 | case SIOCGIFPFLAGS: | |
3502 | case SIOCGIFTXQLEN: | |
3503 | case SIOCSIFTXQLEN: | |
3504 | case SIOCBRADDIF: | |
3505 | case SIOCBRDELIF: | |
c6c9fee3 | 3506 | case SIOCGIFNAME: |
9177efd3 AB |
3507 | case SIOCSIFNAME: |
3508 | case SIOCGMIIPHY: | |
3509 | case SIOCGMIIREG: | |
3510 | case SIOCSMIIREG: | |
f92d4fc9 AV |
3511 | case SIOCBONDENSLAVE: |
3512 | case SIOCBONDRELEASE: | |
3513 | case SIOCBONDSETHWADDR: | |
3514 | case SIOCBONDCHANGEACTIVE: | |
6b96018b AB |
3515 | case SIOCSARP: |
3516 | case SIOCGARP: | |
3517 | case SIOCDARP: | |
c7dc504e | 3518 | case SIOCOUTQ: |
9d7bf41f | 3519 | case SIOCOUTQNSD: |
6b96018b | 3520 | case SIOCATMARK: |
63ff03ab | 3521 | return sock_do_ioctl(net, sock, cmd, arg); |
9177efd3 AB |
3522 | } |
3523 | ||
6b96018b AB |
3524 | return -ENOIOCTLCMD; |
3525 | } | |
7a229387 | 3526 | |
95c96174 | 3527 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, |
89bddce5 | 3528 | unsigned long arg) |
89bbfc95 SP |
3529 | { |
3530 | struct socket *sock = file->private_data; | |
1ded5e5a | 3531 | const struct proto_ops *ops = READ_ONCE(sock->ops); |
89bbfc95 | 3532 | int ret = -ENOIOCTLCMD; |
87de87d5 DM |
3533 | struct sock *sk; |
3534 | struct net *net; | |
3535 | ||
3536 | sk = sock->sk; | |
3537 | net = sock_net(sk); | |
89bbfc95 | 3538 | |
1ded5e5a ED |
3539 | if (ops->compat_ioctl) |
3540 | ret = ops->compat_ioctl(sock, cmd, arg); | |
89bbfc95 | 3541 | |
87de87d5 DM |
3542 | if (ret == -ENOIOCTLCMD && |
3543 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3544 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3545 | ||
6b96018b AB |
3546 | if (ret == -ENOIOCTLCMD) |
3547 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3548 | ||
89bbfc95 SP |
3549 | return ret; |
3550 | } | |
3551 | #endif | |
3552 | ||
8a3c245c PT |
3553 | /** |
3554 | * kernel_bind - bind an address to a socket (kernel space) | |
3555 | * @sock: socket | |
3556 | * @addr: address | |
3557 | * @addrlen: length of address | |
3558 | * | |
3559 | * Returns 0 or an error. | |
3560 | */ | |
3561 | ||
ac5a488e SS |
3562 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
3563 | { | |
c889a99a JR |
3564 | struct sockaddr_storage address; |
3565 | ||
3566 | memcpy(&address, addr, addrlen); | |
3567 | ||
3568 | return READ_ONCE(sock->ops)->bind(sock, (struct sockaddr *)&address, | |
3569 | addrlen); | |
ac5a488e | 3570 | } |
c6d409cf | 3571 | EXPORT_SYMBOL(kernel_bind); |
ac5a488e | 3572 | |
8a3c245c PT |
3573 | /** |
3574 | * kernel_listen - move socket to listening state (kernel space) | |
3575 | * @sock: socket | |
3576 | * @backlog: pending connections queue size | |
3577 | * | |
3578 | * Returns 0 or an error. | |
3579 | */ | |
3580 | ||
ac5a488e SS |
3581 | int kernel_listen(struct socket *sock, int backlog) |
3582 | { | |
1ded5e5a | 3583 | return READ_ONCE(sock->ops)->listen(sock, backlog); |
ac5a488e | 3584 | } |
c6d409cf | 3585 | EXPORT_SYMBOL(kernel_listen); |
ac5a488e | 3586 | |
8a3c245c PT |
3587 | /** |
3588 | * kernel_accept - accept a connection (kernel space) | |
3589 | * @sock: listening socket | |
3590 | * @newsock: new connected socket | |
3591 | * @flags: flags | |
3592 | * | |
3593 | * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. | |
3594 | * If it fails, @newsock is guaranteed to be %NULL. | |
3595 | * Returns 0 or an error. | |
3596 | */ | |
3597 | ||
ac5a488e SS |
3598 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
3599 | { | |
3600 | struct sock *sk = sock->sk; | |
1ded5e5a | 3601 | const struct proto_ops *ops = READ_ONCE(sock->ops); |
92ef0fd5 JA |
3602 | struct proto_accept_arg arg = { |
3603 | .flags = flags, | |
3604 | .kern = true, | |
3605 | }; | |
ac5a488e SS |
3606 | int err; |
3607 | ||
3608 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3609 | newsock); | |
3610 | if (err < 0) | |
3611 | goto done; | |
3612 | ||
92ef0fd5 | 3613 | err = ops->accept(sock, *newsock, &arg); |
ac5a488e SS |
3614 | if (err < 0) { |
3615 | sock_release(*newsock); | |
fa8705b0 | 3616 | *newsock = NULL; |
ac5a488e SS |
3617 | goto done; |
3618 | } | |
3619 | ||
1ded5e5a ED |
3620 | (*newsock)->ops = ops; |
3621 | __module_get(ops->owner); | |
ac5a488e SS |
3622 | |
3623 | done: | |
3624 | return err; | |
3625 | } | |
c6d409cf | 3626 | EXPORT_SYMBOL(kernel_accept); |
ac5a488e | 3627 | |
8a3c245c PT |
3628 | /** |
3629 | * kernel_connect - connect a socket (kernel space) | |
3630 | * @sock: socket | |
3631 | * @addr: address | |
3632 | * @addrlen: address length | |
3633 | * @flags: flags (O_NONBLOCK, ...) | |
3634 | * | |
f1dcffcc | 3635 | * For datagram sockets, @addr is the address to which datagrams are sent |
8a3c245c PT |
3636 | * by default, and the only address from which datagrams are received. |
3637 | * For stream sockets, attempts to connect to @addr. | |
3638 | * Returns 0 or an error code. | |
3639 | */ | |
3640 | ||
ac5a488e | 3641 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
4768fbcb | 3642 | int flags) |
ac5a488e | 3643 | { |
0bdf3993 JR |
3644 | struct sockaddr_storage address; |
3645 | ||
3646 | memcpy(&address, addr, addrlen); | |
3647 | ||
3648 | return READ_ONCE(sock->ops)->connect(sock, (struct sockaddr *)&address, | |
3649 | addrlen, flags); | |
ac5a488e | 3650 | } |
c6d409cf | 3651 | EXPORT_SYMBOL(kernel_connect); |
ac5a488e | 3652 | |
8a3c245c PT |
3653 | /** |
3654 | * kernel_getsockname - get the address which the socket is bound (kernel space) | |
3655 | * @sock: socket | |
3656 | * @addr: address holder | |
3657 | * | |
3658 | * Fills the @addr pointer with the address which the socket is bound. | |
0fc95dec | 3659 | * Returns the length of the address in bytes or an error code. |
8a3c245c PT |
3660 | */ |
3661 | ||
9b2c45d4 | 3662 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3663 | { |
1ded5e5a | 3664 | return READ_ONCE(sock->ops)->getname(sock, addr, 0); |
ac5a488e | 3665 | } |
c6d409cf | 3666 | EXPORT_SYMBOL(kernel_getsockname); |
ac5a488e | 3667 | |
8a3c245c | 3668 | /** |
645f0897 | 3669 | * kernel_getpeername - get the address which the socket is connected (kernel space) |
8a3c245c PT |
3670 | * @sock: socket |
3671 | * @addr: address holder | |
3672 | * | |
3673 | * Fills the @addr pointer with the address which the socket is connected. | |
0fc95dec | 3674 | * Returns the length of the address in bytes or an error code. |
8a3c245c PT |
3675 | */ |
3676 | ||
9b2c45d4 | 3677 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3678 | { |
1ded5e5a | 3679 | return READ_ONCE(sock->ops)->getname(sock, addr, 1); |
ac5a488e | 3680 | } |
c6d409cf | 3681 | EXPORT_SYMBOL(kernel_getpeername); |
ac5a488e | 3682 | |
8a3c245c | 3683 | /** |
645f0897 | 3684 | * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space) |
8a3c245c PT |
3685 | * @sock: socket |
3686 | * @how: connection part | |
3687 | * | |
3688 | * Returns 0 or an error. | |
3689 | */ | |
3690 | ||
91cf45f0 TM |
3691 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
3692 | { | |
1ded5e5a | 3693 | return READ_ONCE(sock->ops)->shutdown(sock, how); |
91cf45f0 | 3694 | } |
91cf45f0 | 3695 | EXPORT_SYMBOL(kernel_sock_shutdown); |
113c3075 | 3696 | |
8a3c245c PT |
3697 | /** |
3698 | * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket | |
3699 | * @sk: socket | |
3700 | * | |
3701 | * This routine returns the IP overhead imposed by a socket i.e. | |
3702 | * the length of the underlying IP header, depending on whether | |
3703 | * this is an IPv4 or IPv6 socket and the length from IP options turned | |
3704 | * on at the socket. Assumes that the caller has a lock on the socket. | |
113c3075 | 3705 | */ |
8a3c245c | 3706 | |
113c3075 P |
3707 | u32 kernel_sock_ip_overhead(struct sock *sk) |
3708 | { | |
3709 | struct inet_sock *inet; | |
3710 | struct ip_options_rcu *opt; | |
3711 | u32 overhead = 0; | |
113c3075 P |
3712 | #if IS_ENABLED(CONFIG_IPV6) |
3713 | struct ipv6_pinfo *np; | |
3714 | struct ipv6_txoptions *optv6 = NULL; | |
3715 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3716 | ||
3717 | if (!sk) | |
3718 | return overhead; | |
3719 | ||
113c3075 P |
3720 | switch (sk->sk_family) { |
3721 | case AF_INET: | |
3722 | inet = inet_sk(sk); | |
3723 | overhead += sizeof(struct iphdr); | |
3724 | opt = rcu_dereference_protected(inet->inet_opt, | |
614d79c0 | 3725 | sock_owned_by_user(sk)); |
113c3075 P |
3726 | if (opt) |
3727 | overhead += opt->opt.optlen; | |
3728 | return overhead; | |
3729 | #if IS_ENABLED(CONFIG_IPV6) | |
3730 | case AF_INET6: | |
3731 | np = inet6_sk(sk); | |
3732 | overhead += sizeof(struct ipv6hdr); | |
3733 | if (np) | |
3734 | optv6 = rcu_dereference_protected(np->opt, | |
614d79c0 | 3735 | sock_owned_by_user(sk)); |
113c3075 P |
3736 | if (optv6) |
3737 | overhead += (optv6->opt_flen + optv6->opt_nflen); | |
3738 | return overhead; | |
3739 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3740 | default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ | |
3741 | return overhead; | |
3742 | } | |
3743 | } | |
3744 | EXPORT_SYMBOL(kernel_sock_ip_overhead); |