Commit | Line | Data |
---|---|---|
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> | |
60 | #include <linux/net.h> | |
61 | #include <linux/interrupt.h> | |
aaca0bdc | 62 | #include <linux/thread_info.h> |
55737fda | 63 | #include <linux/rcupdate.h> |
1da177e4 LT |
64 | #include <linux/netdevice.h> |
65 | #include <linux/proc_fs.h> | |
66 | #include <linux/seq_file.h> | |
4a3e2f71 | 67 | #include <linux/mutex.h> |
1da177e4 | 68 | #include <linux/if_bridge.h> |
20380731 | 69 | #include <linux/if_vlan.h> |
408eccce | 70 | #include <linux/ptp_classify.h> |
1da177e4 LT |
71 | #include <linux/init.h> |
72 | #include <linux/poll.h> | |
73 | #include <linux/cache.h> | |
74 | #include <linux/module.h> | |
75 | #include <linux/highmem.h> | |
1da177e4 | 76 | #include <linux/mount.h> |
fba9be49 | 77 | #include <linux/pseudo_fs.h> |
1da177e4 LT |
78 | #include <linux/security.h> |
79 | #include <linux/syscalls.h> | |
80 | #include <linux/compat.h> | |
81 | #include <linux/kmod.h> | |
3ec3b2fb | 82 | #include <linux/audit.h> |
d86b5e0e | 83 | #include <linux/wireless.h> |
1b8d7ae4 | 84 | #include <linux/nsproxy.h> |
1fd7317d | 85 | #include <linux/magic.h> |
5a0e3ad6 | 86 | #include <linux/slab.h> |
600e1779 | 87 | #include <linux/xattr.h> |
c8e8cd57 | 88 | #include <linux/nospec.h> |
8c3c447b | 89 | #include <linux/indirect_call_wrapper.h> |
1da177e4 | 90 | |
7c0f6ba6 | 91 | #include <linux/uaccess.h> |
1da177e4 LT |
92 | #include <asm/unistd.h> |
93 | ||
94 | #include <net/compat.h> | |
87de87d5 | 95 | #include <net/wext.h> |
f8451725 | 96 | #include <net/cls_cgroup.h> |
1da177e4 LT |
97 | |
98 | #include <net/sock.h> | |
99 | #include <linux/netfilter.h> | |
100 | ||
6b96018b AB |
101 | #include <linux/if_tun.h> |
102 | #include <linux/ipv6_route.h> | |
103 | #include <linux/route.h> | |
c7dc504e | 104 | #include <linux/termios.h> |
6b96018b | 105 | #include <linux/sockios.h> |
076bb0c8 | 106 | #include <net/busy_poll.h> |
f24b9be5 | 107 | #include <linux/errqueue.h> |
d7c08826 | 108 | #include <linux/ptp_clock_kernel.h> |
6e6eda44 | 109 | #include <trace/events/sock.h> |
06021292 | 110 | |
e0d1095a | 111 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 ET |
112 | unsigned int sysctl_net_busy_read __read_mostly; |
113 | unsigned int sysctl_net_busy_poll __read_mostly; | |
06021292 | 114 | #endif |
6b96018b | 115 | |
8ae5e030 AV |
116 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); |
117 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); | |
89bddce5 | 118 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
1da177e4 LT |
119 | |
120 | static int sock_close(struct inode *inode, struct file *file); | |
a11e1d43 LT |
121 | static __poll_t sock_poll(struct file *file, |
122 | struct poll_table_struct *wait); | |
89bddce5 | 123 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
89bbfc95 SP |
124 | #ifdef CONFIG_COMPAT |
125 | static long compat_sock_ioctl(struct file *file, | |
89bddce5 | 126 | unsigned int cmd, unsigned long arg); |
89bbfc95 | 127 | #endif |
1da177e4 | 128 | static int sock_fasync(int fd, struct file *filp, int on); |
1da177e4 LT |
129 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
130 | int offset, size_t size, loff_t *ppos, int more); | |
9c55e01c | 131 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 132 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c | 133 | unsigned int flags); |
542d3065 AB |
134 | |
135 | #ifdef CONFIG_PROC_FS | |
136 | static void sock_show_fdinfo(struct seq_file *m, struct file *f) | |
137 | { | |
138 | struct socket *sock = f->private_data; | |
139 | ||
140 | if (sock->ops->show_fdinfo) | |
141 | sock->ops->show_fdinfo(m, sock); | |
142 | } | |
143 | #else | |
144 | #define sock_show_fdinfo NULL | |
145 | #endif | |
1da177e4 | 146 | |
1da177e4 LT |
147 | /* |
148 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear | |
149 | * in the operation structures but are done directly via the socketcall() multiplexor. | |
150 | */ | |
151 | ||
da7071d7 | 152 | static const struct file_operations socket_file_ops = { |
1da177e4 LT |
153 | .owner = THIS_MODULE, |
154 | .llseek = no_llseek, | |
8ae5e030 AV |
155 | .read_iter = sock_read_iter, |
156 | .write_iter = sock_write_iter, | |
1da177e4 LT |
157 | .poll = sock_poll, |
158 | .unlocked_ioctl = sock_ioctl, | |
89bbfc95 SP |
159 | #ifdef CONFIG_COMPAT |
160 | .compat_ioctl = compat_sock_ioctl, | |
161 | #endif | |
1da177e4 | 162 | .mmap = sock_mmap, |
1da177e4 LT |
163 | .release = sock_close, |
164 | .fasync = sock_fasync, | |
5274f052 JA |
165 | .sendpage = sock_sendpage, |
166 | .splice_write = generic_splice_sendpage, | |
9c55e01c | 167 | .splice_read = sock_splice_read, |
b4653342 | 168 | .show_fdinfo = sock_show_fdinfo, |
1da177e4 LT |
169 | }; |
170 | ||
fe0bdbde YD |
171 | static const char * const pf_family_names[] = { |
172 | [PF_UNSPEC] = "PF_UNSPEC", | |
173 | [PF_UNIX] = "PF_UNIX/PF_LOCAL", | |
174 | [PF_INET] = "PF_INET", | |
175 | [PF_AX25] = "PF_AX25", | |
176 | [PF_IPX] = "PF_IPX", | |
177 | [PF_APPLETALK] = "PF_APPLETALK", | |
178 | [PF_NETROM] = "PF_NETROM", | |
179 | [PF_BRIDGE] = "PF_BRIDGE", | |
180 | [PF_ATMPVC] = "PF_ATMPVC", | |
181 | [PF_X25] = "PF_X25", | |
182 | [PF_INET6] = "PF_INET6", | |
183 | [PF_ROSE] = "PF_ROSE", | |
184 | [PF_DECnet] = "PF_DECnet", | |
185 | [PF_NETBEUI] = "PF_NETBEUI", | |
186 | [PF_SECURITY] = "PF_SECURITY", | |
187 | [PF_KEY] = "PF_KEY", | |
188 | [PF_NETLINK] = "PF_NETLINK/PF_ROUTE", | |
189 | [PF_PACKET] = "PF_PACKET", | |
190 | [PF_ASH] = "PF_ASH", | |
191 | [PF_ECONET] = "PF_ECONET", | |
192 | [PF_ATMSVC] = "PF_ATMSVC", | |
193 | [PF_RDS] = "PF_RDS", | |
194 | [PF_SNA] = "PF_SNA", | |
195 | [PF_IRDA] = "PF_IRDA", | |
196 | [PF_PPPOX] = "PF_PPPOX", | |
197 | [PF_WANPIPE] = "PF_WANPIPE", | |
198 | [PF_LLC] = "PF_LLC", | |
199 | [PF_IB] = "PF_IB", | |
200 | [PF_MPLS] = "PF_MPLS", | |
201 | [PF_CAN] = "PF_CAN", | |
202 | [PF_TIPC] = "PF_TIPC", | |
203 | [PF_BLUETOOTH] = "PF_BLUETOOTH", | |
204 | [PF_IUCV] = "PF_IUCV", | |
205 | [PF_RXRPC] = "PF_RXRPC", | |
206 | [PF_ISDN] = "PF_ISDN", | |
207 | [PF_PHONET] = "PF_PHONET", | |
208 | [PF_IEEE802154] = "PF_IEEE802154", | |
209 | [PF_CAIF] = "PF_CAIF", | |
210 | [PF_ALG] = "PF_ALG", | |
211 | [PF_NFC] = "PF_NFC", | |
212 | [PF_VSOCK] = "PF_VSOCK", | |
213 | [PF_KCM] = "PF_KCM", | |
214 | [PF_QIPCRTR] = "PF_QIPCRTR", | |
215 | [PF_SMC] = "PF_SMC", | |
216 | [PF_XDP] = "PF_XDP", | |
bc49d816 | 217 | [PF_MCTP] = "PF_MCTP", |
fe0bdbde YD |
218 | }; |
219 | ||
1da177e4 LT |
220 | /* |
221 | * The protocol list. Each protocol is registered in here. | |
222 | */ | |
223 | ||
1da177e4 | 224 | static DEFINE_SPINLOCK(net_family_lock); |
190683a9 | 225 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; |
1da177e4 | 226 | |
1da177e4 | 227 | /* |
89bddce5 SH |
228 | * Support routines. |
229 | * Move socket addresses back and forth across the kernel/user | |
230 | * divide and look after the messy bits. | |
1da177e4 LT |
231 | */ |
232 | ||
1da177e4 LT |
233 | /** |
234 | * move_addr_to_kernel - copy a socket address into kernel space | |
235 | * @uaddr: Address in user space | |
236 | * @kaddr: Address in kernel space | |
237 | * @ulen: Length in user space | |
238 | * | |
239 | * The address is copied into kernel space. If the provided address is | |
240 | * too long an error code of -EINVAL is returned. If the copy gives | |
241 | * invalid addresses -EFAULT is returned. On a success 0 is returned. | |
242 | */ | |
243 | ||
43db362d | 244 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) |
1da177e4 | 245 | { |
230b1839 | 246 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
1da177e4 | 247 | return -EINVAL; |
89bddce5 | 248 | if (ulen == 0) |
1da177e4 | 249 | return 0; |
89bddce5 | 250 | if (copy_from_user(kaddr, uaddr, ulen)) |
1da177e4 | 251 | return -EFAULT; |
3ec3b2fb | 252 | return audit_sockaddr(ulen, kaddr); |
1da177e4 LT |
253 | } |
254 | ||
255 | /** | |
256 | * move_addr_to_user - copy an address to user space | |
257 | * @kaddr: kernel space address | |
258 | * @klen: length of address in kernel | |
259 | * @uaddr: user space address | |
260 | * @ulen: pointer to user length field | |
261 | * | |
262 | * The value pointed to by ulen on entry is the buffer length available. | |
263 | * This is overwritten with the buffer space used. -EINVAL is returned | |
264 | * if an overlong buffer is specified or a negative buffer size. -EFAULT | |
265 | * is returned if either the buffer or the length field are not | |
266 | * accessible. | |
267 | * After copying the data up to the limit the user specifies, the true | |
268 | * length of the data is written over the length limit the user | |
269 | * specified. Zero is returned for a success. | |
270 | */ | |
89bddce5 | 271 | |
43db362d | 272 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, |
11165f14 | 273 | void __user *uaddr, int __user *ulen) |
1da177e4 LT |
274 | { |
275 | int err; | |
276 | int len; | |
277 | ||
68c6beb3 | 278 | BUG_ON(klen > sizeof(struct sockaddr_storage)); |
89bddce5 SH |
279 | err = get_user(len, ulen); |
280 | if (err) | |
1da177e4 | 281 | return err; |
89bddce5 SH |
282 | if (len > klen) |
283 | len = klen; | |
68c6beb3 | 284 | if (len < 0) |
1da177e4 | 285 | return -EINVAL; |
89bddce5 | 286 | if (len) { |
d6fe3945 SG |
287 | if (audit_sockaddr(klen, kaddr)) |
288 | return -ENOMEM; | |
89bddce5 | 289 | if (copy_to_user(uaddr, kaddr, len)) |
1da177e4 LT |
290 | return -EFAULT; |
291 | } | |
292 | /* | |
89bddce5 SH |
293 | * "fromlen shall refer to the value before truncation.." |
294 | * 1003.1g | |
1da177e4 LT |
295 | */ |
296 | return __put_user(klen, ulen); | |
297 | } | |
298 | ||
08009a76 | 299 | static struct kmem_cache *sock_inode_cachep __ro_after_init; |
1da177e4 LT |
300 | |
301 | static struct inode *sock_alloc_inode(struct super_block *sb) | |
302 | { | |
303 | struct socket_alloc *ei; | |
89bddce5 | 304 | |
fd60b288 | 305 | ei = alloc_inode_sb(sb, sock_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
306 | if (!ei) |
307 | return NULL; | |
333f7909 AV |
308 | init_waitqueue_head(&ei->socket.wq.wait); |
309 | ei->socket.wq.fasync_list = NULL; | |
310 | ei->socket.wq.flags = 0; | |
89bddce5 | 311 | |
1da177e4 LT |
312 | ei->socket.state = SS_UNCONNECTED; |
313 | ei->socket.flags = 0; | |
314 | ei->socket.ops = NULL; | |
315 | ei->socket.sk = NULL; | |
316 | ei->socket.file = NULL; | |
1da177e4 LT |
317 | |
318 | return &ei->vfs_inode; | |
319 | } | |
320 | ||
6d7855c5 | 321 | static void sock_free_inode(struct inode *inode) |
1da177e4 | 322 | { |
43815482 ED |
323 | struct socket_alloc *ei; |
324 | ||
325 | ei = container_of(inode, struct socket_alloc, vfs_inode); | |
43815482 | 326 | kmem_cache_free(sock_inode_cachep, ei); |
1da177e4 LT |
327 | } |
328 | ||
51cc5068 | 329 | static void init_once(void *foo) |
1da177e4 | 330 | { |
89bddce5 | 331 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
1da177e4 | 332 | |
a35afb83 | 333 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 334 | } |
89bddce5 | 335 | |
1e911632 | 336 | static void init_inodecache(void) |
1da177e4 LT |
337 | { |
338 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", | |
89bddce5 SH |
339 | sizeof(struct socket_alloc), |
340 | 0, | |
341 | (SLAB_HWCACHE_ALIGN | | |
342 | SLAB_RECLAIM_ACCOUNT | | |
5d097056 | 343 | SLAB_MEM_SPREAD | SLAB_ACCOUNT), |
20c2df83 | 344 | init_once); |
1e911632 | 345 | BUG_ON(sock_inode_cachep == NULL); |
1da177e4 LT |
346 | } |
347 | ||
b87221de | 348 | static const struct super_operations sockfs_ops = { |
c6d409cf | 349 | .alloc_inode = sock_alloc_inode, |
6d7855c5 | 350 | .free_inode = sock_free_inode, |
c6d409cf | 351 | .statfs = simple_statfs, |
1da177e4 LT |
352 | }; |
353 | ||
c23fbb6b ED |
354 | /* |
355 | * sockfs_dname() is called from d_path(). | |
356 | */ | |
357 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) | |
358 | { | |
0f60d288 | 359 | return dynamic_dname(buffer, buflen, "socket:[%lu]", |
c5ef6035 | 360 | d_inode(dentry)->i_ino); |
c23fbb6b ED |
361 | } |
362 | ||
3ba13d17 | 363 | static const struct dentry_operations sockfs_dentry_operations = { |
c23fbb6b | 364 | .d_dname = sockfs_dname, |
1da177e4 LT |
365 | }; |
366 | ||
bba0bd31 AG |
367 | static int sockfs_xattr_get(const struct xattr_handler *handler, |
368 | struct dentry *dentry, struct inode *inode, | |
369 | const char *suffix, void *value, size_t size) | |
370 | { | |
371 | if (value) { | |
372 | if (dentry->d_name.len + 1 > size) | |
373 | return -ERANGE; | |
374 | memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); | |
375 | } | |
376 | return dentry->d_name.len + 1; | |
377 | } | |
378 | ||
379 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" | |
380 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) | |
381 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) | |
382 | ||
383 | static const struct xattr_handler sockfs_xattr_handler = { | |
384 | .name = XATTR_NAME_SOCKPROTONAME, | |
385 | .get = sockfs_xattr_get, | |
386 | }; | |
387 | ||
4a590153 | 388 | static int sockfs_security_xattr_set(const struct xattr_handler *handler, |
39f60c1c | 389 | struct mnt_idmap *idmap, |
4a590153 AG |
390 | struct dentry *dentry, struct inode *inode, |
391 | const char *suffix, const void *value, | |
392 | size_t size, int flags) | |
393 | { | |
394 | /* Handled by LSM. */ | |
395 | return -EAGAIN; | |
396 | } | |
397 | ||
398 | static const struct xattr_handler sockfs_security_xattr_handler = { | |
399 | .prefix = XATTR_SECURITY_PREFIX, | |
400 | .set = sockfs_security_xattr_set, | |
401 | }; | |
402 | ||
bba0bd31 AG |
403 | static const struct xattr_handler *sockfs_xattr_handlers[] = { |
404 | &sockfs_xattr_handler, | |
4a590153 | 405 | &sockfs_security_xattr_handler, |
bba0bd31 AG |
406 | NULL |
407 | }; | |
408 | ||
fba9be49 | 409 | static int sockfs_init_fs_context(struct fs_context *fc) |
c74a1cbb | 410 | { |
fba9be49 DH |
411 | struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC); |
412 | if (!ctx) | |
413 | return -ENOMEM; | |
414 | ctx->ops = &sockfs_ops; | |
415 | ctx->dops = &sockfs_dentry_operations; | |
416 | ctx->xattr = sockfs_xattr_handlers; | |
417 | return 0; | |
c74a1cbb AV |
418 | } |
419 | ||
420 | static struct vfsmount *sock_mnt __read_mostly; | |
421 | ||
422 | static struct file_system_type sock_fs_type = { | |
423 | .name = "sockfs", | |
fba9be49 | 424 | .init_fs_context = sockfs_init_fs_context, |
c74a1cbb AV |
425 | .kill_sb = kill_anon_super, |
426 | }; | |
427 | ||
1da177e4 LT |
428 | /* |
429 | * Obtains the first available file descriptor and sets it up for use. | |
430 | * | |
39d8c1b6 DM |
431 | * These functions create file structures and maps them to fd space |
432 | * of the current process. On success it returns file descriptor | |
1da177e4 LT |
433 | * and file struct implicitly stored in sock->file. |
434 | * Note that another thread may close file descriptor before we return | |
435 | * from this function. We use the fact that now we do not refer | |
436 | * to socket after mapping. If one day we will need it, this | |
437 | * function will increment ref. count on file by 1. | |
438 | * | |
439 | * In any case returned fd MAY BE not valid! | |
440 | * This race condition is unavoidable | |
441 | * with shared fd spaces, we cannot solve it inside kernel, | |
442 | * but we take care of internal coherence yet. | |
443 | */ | |
444 | ||
8a3c245c PT |
445 | /** |
446 | * sock_alloc_file - Bind a &socket to a &file | |
447 | * @sock: socket | |
448 | * @flags: file status flags | |
449 | * @dname: protocol name | |
450 | * | |
451 | * Returns the &file bound with @sock, implicitly storing it | |
452 | * in sock->file. If dname is %NULL, sets to "". | |
649c15c7 TLSC |
453 | * |
454 | * On failure @sock is released, and an ERR pointer is returned. | |
455 | * | |
8a3c245c PT |
456 | * This function uses GFP_KERNEL internally. |
457 | */ | |
458 | ||
aab174f0 | 459 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) |
1da177e4 | 460 | { |
7cbe66b6 | 461 | struct file *file; |
1da177e4 | 462 | |
d93aa9d8 AV |
463 | if (!dname) |
464 | dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; | |
39d8c1b6 | 465 | |
d93aa9d8 AV |
466 | file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, |
467 | O_RDWR | (flags & O_NONBLOCK), | |
468 | &socket_file_ops); | |
b5ffe634 | 469 | if (IS_ERR(file)) { |
8e1611e2 | 470 | sock_release(sock); |
39b65252 | 471 | return file; |
cc3808f8 AV |
472 | } |
473 | ||
474 | sock->file = file; | |
39d8c1b6 | 475 | file->private_data = sock; |
d8e464ec | 476 | stream_open(SOCK_INODE(sock), file); |
28407630 | 477 | return file; |
39d8c1b6 | 478 | } |
56b31d1c | 479 | EXPORT_SYMBOL(sock_alloc_file); |
39d8c1b6 | 480 | |
56b31d1c | 481 | static int sock_map_fd(struct socket *sock, int flags) |
39d8c1b6 DM |
482 | { |
483 | struct file *newfile; | |
28407630 | 484 | int fd = get_unused_fd_flags(flags); |
ce4bb04c AV |
485 | if (unlikely(fd < 0)) { |
486 | sock_release(sock); | |
28407630 | 487 | return fd; |
ce4bb04c | 488 | } |
39d8c1b6 | 489 | |
aab174f0 | 490 | newfile = sock_alloc_file(sock, flags, NULL); |
4546e44c | 491 | if (!IS_ERR(newfile)) { |
39d8c1b6 | 492 | fd_install(fd, newfile); |
28407630 AV |
493 | return fd; |
494 | } | |
7cbe66b6 | 495 | |
28407630 AV |
496 | put_unused_fd(fd); |
497 | return PTR_ERR(newfile); | |
1da177e4 LT |
498 | } |
499 | ||
8a3c245c PT |
500 | /** |
501 | * sock_from_file - Return the &socket bounded to @file. | |
502 | * @file: file | |
8a3c245c | 503 | * |
dba4a925 | 504 | * On failure returns %NULL. |
8a3c245c PT |
505 | */ |
506 | ||
dba4a925 | 507 | struct socket *sock_from_file(struct file *file) |
6cb153ca | 508 | { |
6cb153ca | 509 | if (file->f_op == &socket_file_ops) |
da214a47 | 510 | return file->private_data; /* set in sock_alloc_file */ |
6cb153ca | 511 | |
23bb80d2 | 512 | return NULL; |
6cb153ca | 513 | } |
406a3c63 | 514 | EXPORT_SYMBOL(sock_from_file); |
6cb153ca | 515 | |
1da177e4 | 516 | /** |
c6d409cf | 517 | * sockfd_lookup - Go from a file number to its socket slot |
1da177e4 LT |
518 | * @fd: file handle |
519 | * @err: pointer to an error code return | |
520 | * | |
521 | * The file handle passed in is locked and the socket it is bound | |
241c4667 | 522 | * to is returned. If an error occurs the err pointer is overwritten |
1da177e4 LT |
523 | * with a negative errno code and NULL is returned. The function checks |
524 | * for both invalid handles and passing a handle which is not a socket. | |
525 | * | |
526 | * On a success the socket object pointer is returned. | |
527 | */ | |
528 | ||
529 | struct socket *sockfd_lookup(int fd, int *err) | |
530 | { | |
531 | struct file *file; | |
1da177e4 LT |
532 | struct socket *sock; |
533 | ||
89bddce5 SH |
534 | file = fget(fd); |
535 | if (!file) { | |
1da177e4 LT |
536 | *err = -EBADF; |
537 | return NULL; | |
538 | } | |
89bddce5 | 539 | |
dba4a925 FR |
540 | sock = sock_from_file(file); |
541 | if (!sock) { | |
542 | *err = -ENOTSOCK; | |
1da177e4 | 543 | fput(file); |
dba4a925 | 544 | } |
6cb153ca BL |
545 | return sock; |
546 | } | |
c6d409cf | 547 | EXPORT_SYMBOL(sockfd_lookup); |
1da177e4 | 548 | |
6cb153ca BL |
549 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
550 | { | |
00e188ef | 551 | struct fd f = fdget(fd); |
6cb153ca BL |
552 | struct socket *sock; |
553 | ||
3672558c | 554 | *err = -EBADF; |
00e188ef | 555 | if (f.file) { |
dba4a925 | 556 | sock = sock_from_file(f.file); |
00e188ef | 557 | if (likely(sock)) { |
ce787a5a | 558 | *fput_needed = f.flags & FDPUT_FPUT; |
6cb153ca | 559 | return sock; |
00e188ef | 560 | } |
dba4a925 | 561 | *err = -ENOTSOCK; |
00e188ef | 562 | fdput(f); |
1da177e4 | 563 | } |
6cb153ca | 564 | return NULL; |
1da177e4 LT |
565 | } |
566 | ||
600e1779 MY |
567 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, |
568 | size_t size) | |
569 | { | |
570 | ssize_t len; | |
571 | ssize_t used = 0; | |
572 | ||
c5ef6035 | 573 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); |
600e1779 MY |
574 | if (len < 0) |
575 | return len; | |
576 | used += len; | |
577 | if (buffer) { | |
578 | if (size < used) | |
579 | return -ERANGE; | |
580 | buffer += len; | |
581 | } | |
582 | ||
583 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); | |
584 | used += len; | |
585 | if (buffer) { | |
586 | if (size < used) | |
587 | return -ERANGE; | |
588 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); | |
589 | buffer += len; | |
590 | } | |
591 | ||
592 | return used; | |
593 | } | |
594 | ||
c1632a0f | 595 | static int sockfs_setattr(struct mnt_idmap *idmap, |
549c7297 | 596 | struct dentry *dentry, struct iattr *iattr) |
86741ec2 | 597 | { |
c1632a0f | 598 | int err = simple_setattr(&nop_mnt_idmap, dentry, iattr); |
86741ec2 | 599 | |
e1a3a60a | 600 | if (!err && (iattr->ia_valid & ATTR_UID)) { |
86741ec2 LC |
601 | struct socket *sock = SOCKET_I(d_inode(dentry)); |
602 | ||
6d8c50dc CW |
603 | if (sock->sk) |
604 | sock->sk->sk_uid = iattr->ia_uid; | |
605 | else | |
606 | err = -ENOENT; | |
86741ec2 LC |
607 | } |
608 | ||
609 | return err; | |
610 | } | |
611 | ||
600e1779 | 612 | static const struct inode_operations sockfs_inode_ops = { |
600e1779 | 613 | .listxattr = sockfs_listxattr, |
86741ec2 | 614 | .setattr = sockfs_setattr, |
600e1779 MY |
615 | }; |
616 | ||
1da177e4 | 617 | /** |
8a3c245c | 618 | * sock_alloc - allocate a socket |
89bddce5 | 619 | * |
1da177e4 LT |
620 | * Allocate a new inode and socket object. The two are bound together |
621 | * and initialised. The socket is then returned. If we are out of inodes | |
8a3c245c | 622 | * NULL is returned. This functions uses GFP_KERNEL internally. |
1da177e4 LT |
623 | */ |
624 | ||
f4a00aac | 625 | struct socket *sock_alloc(void) |
1da177e4 | 626 | { |
89bddce5 SH |
627 | struct inode *inode; |
628 | struct socket *sock; | |
1da177e4 | 629 | |
a209dfc7 | 630 | inode = new_inode_pseudo(sock_mnt->mnt_sb); |
1da177e4 LT |
631 | if (!inode) |
632 | return NULL; | |
633 | ||
634 | sock = SOCKET_I(inode); | |
635 | ||
85fe4025 | 636 | inode->i_ino = get_next_ino(); |
89bddce5 | 637 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
8192b0c4 DH |
638 | inode->i_uid = current_fsuid(); |
639 | inode->i_gid = current_fsgid(); | |
600e1779 | 640 | inode->i_op = &sockfs_inode_ops; |
1da177e4 | 641 | |
1da177e4 LT |
642 | return sock; |
643 | } | |
f4a00aac | 644 | EXPORT_SYMBOL(sock_alloc); |
1da177e4 | 645 | |
6d8c50dc | 646 | static void __sock_release(struct socket *sock, struct inode *inode) |
1da177e4 LT |
647 | { |
648 | if (sock->ops) { | |
649 | struct module *owner = sock->ops->owner; | |
650 | ||
6d8c50dc CW |
651 | if (inode) |
652 | inode_lock(inode); | |
1da177e4 | 653 | sock->ops->release(sock); |
ff7b11aa | 654 | sock->sk = NULL; |
6d8c50dc CW |
655 | if (inode) |
656 | inode_unlock(inode); | |
1da177e4 LT |
657 | sock->ops = NULL; |
658 | module_put(owner); | |
659 | } | |
660 | ||
333f7909 | 661 | if (sock->wq.fasync_list) |
3410f22e | 662 | pr_err("%s: fasync list not empty!\n", __func__); |
1da177e4 | 663 | |
1da177e4 LT |
664 | if (!sock->file) { |
665 | iput(SOCK_INODE(sock)); | |
666 | return; | |
667 | } | |
89bddce5 | 668 | sock->file = NULL; |
1da177e4 | 669 | } |
6d8c50dc | 670 | |
9a8ad9ac AL |
671 | /** |
672 | * sock_release - close a socket | |
673 | * @sock: socket to close | |
674 | * | |
675 | * The socket is released from the protocol stack if it has a release | |
676 | * callback, and the inode is then released if the socket is bound to | |
677 | * an inode not a file. | |
678 | */ | |
6d8c50dc CW |
679 | void sock_release(struct socket *sock) |
680 | { | |
681 | __sock_release(sock, NULL); | |
682 | } | |
c6d409cf | 683 | EXPORT_SYMBOL(sock_release); |
1da177e4 | 684 | |
c14ac945 | 685 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) |
20d49473 | 686 | { |
140c55d4 ED |
687 | u8 flags = *tx_flags; |
688 | ||
51eb7492 | 689 | if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) { |
140c55d4 ED |
690 | flags |= SKBTX_HW_TSTAMP; |
691 | ||
51eb7492 GE |
692 | /* PTP hardware clocks can provide a free running cycle counter |
693 | * as a time base for virtual clocks. Tell driver to use the | |
694 | * free running cycle counter for timestamp if socket is bound | |
695 | * to virtual clock. | |
696 | */ | |
697 | if (tsflags & SOF_TIMESTAMPING_BIND_PHC) | |
698 | flags |= SKBTX_HW_TSTAMP_USE_CYCLES; | |
699 | } | |
700 | ||
c14ac945 | 701 | if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) |
140c55d4 ED |
702 | flags |= SKBTX_SW_TSTAMP; |
703 | ||
c14ac945 | 704 | if (tsflags & SOF_TIMESTAMPING_TX_SCHED) |
140c55d4 ED |
705 | flags |= SKBTX_SCHED_TSTAMP; |
706 | ||
140c55d4 | 707 | *tx_flags = flags; |
20d49473 | 708 | } |
67cc0d40 | 709 | EXPORT_SYMBOL(__sock_tx_timestamp); |
20d49473 | 710 | |
8c3c447b PA |
711 | INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *, |
712 | size_t)); | |
a648a592 PA |
713 | INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *, |
714 | size_t)); | |
6e6eda44 YC |
715 | |
716 | static noinline void call_trace_sock_send_length(struct sock *sk, int ret, | |
717 | int flags) | |
718 | { | |
719 | trace_sock_send_length(sk, ret, 0); | |
720 | } | |
721 | ||
d8725c86 | 722 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) |
1da177e4 | 723 | { |
a648a592 PA |
724 | int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg, |
725 | inet_sendmsg, sock, msg, | |
726 | msg_data_left(msg)); | |
d8725c86 | 727 | BUG_ON(ret == -EIOCBQUEUED); |
6e6eda44 YC |
728 | |
729 | if (trace_sock_send_length_enabled()) | |
730 | call_trace_sock_send_length(sock->sk, ret, 0); | |
d8725c86 | 731 | return ret; |
1da177e4 LT |
732 | } |
733 | ||
85806af0 RD |
734 | /** |
735 | * sock_sendmsg - send a message through @sock | |
736 | * @sock: socket | |
737 | * @msg: message to send | |
738 | * | |
739 | * Sends @msg through @sock, passing through LSM. | |
740 | * Returns the number of bytes sent, or an error code. | |
741 | */ | |
d8725c86 | 742 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) |
228e548e | 743 | { |
d8725c86 | 744 | int err = security_socket_sendmsg(sock, msg, |
01e97e65 | 745 | msg_data_left(msg)); |
228e548e | 746 | |
d8725c86 | 747 | return err ?: sock_sendmsg_nosec(sock, msg); |
0cf00c6f | 748 | } |
c6d409cf | 749 | EXPORT_SYMBOL(sock_sendmsg); |
1da177e4 | 750 | |
8a3c245c PT |
751 | /** |
752 | * kernel_sendmsg - send a message through @sock (kernel-space) | |
753 | * @sock: socket | |
754 | * @msg: message header | |
755 | * @vec: kernel vec | |
756 | * @num: vec array length | |
757 | * @size: total message data size | |
758 | * | |
759 | * Builds the message data with @vec and sends it through @sock. | |
760 | * Returns the number of bytes sent, or an error code. | |
761 | */ | |
762 | ||
1da177e4 LT |
763 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
764 | struct kvec *vec, size_t num, size_t size) | |
765 | { | |
de4eda9d | 766 | iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size); |
d8725c86 | 767 | return sock_sendmsg(sock, msg); |
1da177e4 | 768 | } |
c6d409cf | 769 | EXPORT_SYMBOL(kernel_sendmsg); |
1da177e4 | 770 | |
8a3c245c PT |
771 | /** |
772 | * kernel_sendmsg_locked - send a message through @sock (kernel-space) | |
773 | * @sk: sock | |
774 | * @msg: message header | |
775 | * @vec: output s/g array | |
776 | * @num: output s/g array length | |
777 | * @size: total message data size | |
778 | * | |
779 | * Builds the message data with @vec and sends it through @sock. | |
780 | * Returns the number of bytes sent, or an error code. | |
781 | * Caller must hold @sk. | |
782 | */ | |
783 | ||
306b13eb TH |
784 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, |
785 | struct kvec *vec, size_t num, size_t size) | |
786 | { | |
787 | struct socket *sock = sk->sk_socket; | |
788 | ||
789 | if (!sock->ops->sendmsg_locked) | |
db5980d8 | 790 | return sock_no_sendmsg_locked(sk, msg, size); |
306b13eb | 791 | |
de4eda9d | 792 | iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size); |
306b13eb TH |
793 | |
794 | return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); | |
795 | } | |
796 | EXPORT_SYMBOL(kernel_sendmsg_locked); | |
797 | ||
8605330a SHY |
798 | static bool skb_is_err_queue(const struct sk_buff *skb) |
799 | { | |
800 | /* pkt_type of skbs enqueued on the error queue are set to | |
801 | * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do | |
802 | * in recvmsg, since skbs received on a local socket will never | |
803 | * have a pkt_type of PACKET_OUTGOING. | |
804 | */ | |
805 | return skb->pkt_type == PACKET_OUTGOING; | |
806 | } | |
807 | ||
b50a5c70 ML |
808 | /* On transmit, software and hardware timestamps are returned independently. |
809 | * As the two skb clones share the hardware timestamp, which may be updated | |
810 | * before the software timestamp is received, a hardware TX timestamp may be | |
811 | * returned only if there is no software TX timestamp. Ignore false software | |
812 | * timestamps, which may be made in the __sock_recv_timestamp() call when the | |
7f1bc6e9 | 813 | * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a |
b50a5c70 ML |
814 | * hardware timestamp. |
815 | */ | |
816 | static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) | |
817 | { | |
818 | return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); | |
819 | } | |
820 | ||
97dc7cd9 GE |
821 | static ktime_t get_timestamp(struct sock *sk, struct sk_buff *skb, int *if_index) |
822 | { | |
823 | bool cycles = sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC; | |
824 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); | |
825 | struct net_device *orig_dev; | |
826 | ktime_t hwtstamp; | |
827 | ||
828 | rcu_read_lock(); | |
829 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
830 | if (orig_dev) { | |
831 | *if_index = orig_dev->ifindex; | |
832 | hwtstamp = netdev_get_tstamp(orig_dev, shhwtstamps, cycles); | |
833 | } else { | |
834 | hwtstamp = shhwtstamps->hwtstamp; | |
835 | } | |
836 | rcu_read_unlock(); | |
837 | ||
838 | return hwtstamp; | |
839 | } | |
840 | ||
841 | static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb, | |
842 | int if_index) | |
aad9c8c4 ML |
843 | { |
844 | struct scm_ts_pktinfo ts_pktinfo; | |
845 | struct net_device *orig_dev; | |
846 | ||
847 | if (!skb_mac_header_was_set(skb)) | |
848 | return; | |
849 | ||
850 | memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); | |
851 | ||
97dc7cd9 GE |
852 | if (!if_index) { |
853 | rcu_read_lock(); | |
854 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); | |
855 | if (orig_dev) | |
856 | if_index = orig_dev->ifindex; | |
857 | rcu_read_unlock(); | |
858 | } | |
859 | ts_pktinfo.if_index = if_index; | |
aad9c8c4 ML |
860 | |
861 | ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); | |
862 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, | |
863 | sizeof(ts_pktinfo), &ts_pktinfo); | |
864 | } | |
865 | ||
92f37fd2 ED |
866 | /* |
867 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) | |
868 | */ | |
869 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, | |
870 | struct sk_buff *skb) | |
871 | { | |
20d49473 | 872 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
887feae3 | 873 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
9718475e DD |
874 | struct scm_timestamping_internal tss; |
875 | ||
b50a5c70 | 876 | int empty = 1, false_tstamp = 0; |
20d49473 PO |
877 | struct skb_shared_hwtstamps *shhwtstamps = |
878 | skb_hwtstamps(skb); | |
97dc7cd9 | 879 | int if_index; |
007747a9 | 880 | ktime_t hwtstamp; |
20d49473 PO |
881 | |
882 | /* Race occurred between timestamp enabling and packet | |
883 | receiving. Fill in the current time for now. */ | |
b50a5c70 | 884 | if (need_software_tstamp && skb->tstamp == 0) { |
20d49473 | 885 | __net_timestamp(skb); |
b50a5c70 ML |
886 | false_tstamp = 1; |
887 | } | |
20d49473 PO |
888 | |
889 | if (need_software_tstamp) { | |
890 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 DD |
891 | if (new_tstamp) { |
892 | struct __kernel_sock_timeval tv; | |
893 | ||
894 | skb_get_new_timestamp(skb, &tv); | |
895 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, | |
896 | sizeof(tv), &tv); | |
897 | } else { | |
898 | struct __kernel_old_timeval tv; | |
899 | ||
900 | skb_get_timestamp(skb, &tv); | |
901 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, | |
902 | sizeof(tv), &tv); | |
903 | } | |
20d49473 | 904 | } else { |
887feae3 DD |
905 | if (new_tstamp) { |
906 | struct __kernel_timespec ts; | |
907 | ||
908 | skb_get_new_timestampns(skb, &ts); | |
909 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, | |
910 | sizeof(ts), &ts); | |
911 | } else { | |
df1b4ba9 | 912 | struct __kernel_old_timespec ts; |
887feae3 DD |
913 | |
914 | skb_get_timestampns(skb, &ts); | |
915 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, | |
916 | sizeof(ts), &ts); | |
917 | } | |
20d49473 PO |
918 | } |
919 | } | |
920 | ||
f24b9be5 | 921 | memset(&tss, 0, sizeof(tss)); |
c199105d | 922 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && |
9718475e | 923 | ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) |
20d49473 | 924 | empty = 0; |
4d276eb6 | 925 | if (shhwtstamps && |
b9f40e21 | 926 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
d7c08826 | 927 | !skb_is_swtx_tstamp(skb, false_tstamp)) { |
97dc7cd9 GE |
928 | if_index = 0; |
929 | if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP_NETDEV) | |
930 | hwtstamp = get_timestamp(sk, skb, &if_index); | |
007747a9 ML |
931 | else |
932 | hwtstamp = shhwtstamps->hwtstamp; | |
d7c08826 | 933 | |
97dc7cd9 GE |
934 | if (sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC) |
935 | hwtstamp = ptp_convert_timestamp(&hwtstamp, | |
936 | sk->sk_bind_phc); | |
937 | ||
007747a9 | 938 | if (ktime_to_timespec64_cond(hwtstamp, tss.ts + 2)) { |
d7c08826 YL |
939 | empty = 0; |
940 | ||
941 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && | |
942 | !skb_is_err_queue(skb)) | |
97dc7cd9 | 943 | put_ts_pktinfo(msg, skb, if_index); |
d7c08826 | 944 | } |
aad9c8c4 | 945 | } |
1c885808 | 946 | if (!empty) { |
9718475e DD |
947 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) |
948 | put_cmsg_scm_timestamping64(msg, &tss); | |
949 | else | |
950 | put_cmsg_scm_timestamping(msg, &tss); | |
1c885808 | 951 | |
8605330a | 952 | if (skb_is_err_queue(skb) && skb->len && |
4ef1b286 | 953 | SKB_EXT_ERR(skb)->opt_stats) |
1c885808 FY |
954 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, |
955 | skb->len, skb->data); | |
956 | } | |
92f37fd2 | 957 | } |
7c81fd8b ACM |
958 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
959 | ||
eb6fba75 | 960 | #ifdef CONFIG_WIRELESS |
6e3e939f JB |
961 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
962 | struct sk_buff *skb) | |
963 | { | |
964 | int ack; | |
965 | ||
966 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) | |
967 | return; | |
968 | if (!skb->wifi_acked_valid) | |
969 | return; | |
970 | ||
971 | ack = skb->wifi_acked; | |
972 | ||
973 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); | |
974 | } | |
975 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); | |
eb6fba75 | 976 | #endif |
6e3e939f | 977 | |
11165f14 | 978 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
979 | struct sk_buff *skb) | |
3b885787 | 980 | { |
744d5a3e | 981 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) |
3b885787 | 982 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
744d5a3e | 983 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); |
3b885787 NH |
984 | } |
985 | ||
6fd1d51c EM |
986 | static void sock_recv_mark(struct msghdr *msg, struct sock *sk, |
987 | struct sk_buff *skb) | |
988 | { | |
2558b803 ED |
989 | if (sock_flag(sk, SOCK_RCVMARK) && skb) { |
990 | /* We must use a bounce buffer for CONFIG_HARDENED_USERCOPY=y */ | |
991 | __u32 mark = skb->mark; | |
992 | ||
993 | put_cmsg(msg, SOL_SOCKET, SO_MARK, sizeof(__u32), &mark); | |
994 | } | |
6fd1d51c EM |
995 | } |
996 | ||
997 | void __sock_recv_cmsgs(struct msghdr *msg, struct sock *sk, | |
998 | struct sk_buff *skb) | |
3b885787 NH |
999 | { |
1000 | sock_recv_timestamp(msg, sk, skb); | |
1001 | sock_recv_drops(msg, sk, skb); | |
6fd1d51c | 1002 | sock_recv_mark(msg, sk, skb); |
3b885787 | 1003 | } |
6fd1d51c | 1004 | EXPORT_SYMBOL_GPL(__sock_recv_cmsgs); |
3b885787 | 1005 | |
8c3c447b | 1006 | INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *, |
a648a592 PA |
1007 | size_t, int)); |
1008 | INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *, | |
1009 | size_t, int)); | |
6e6eda44 YC |
1010 | |
1011 | static noinline void call_trace_sock_recv_length(struct sock *sk, int ret, int flags) | |
1012 | { | |
1013 | trace_sock_recv_length(sk, ret, flags); | |
1014 | } | |
1015 | ||
1b784140 | 1016 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
2da62906 | 1017 | int flags) |
1da177e4 | 1018 | { |
6e6eda44 YC |
1019 | int ret = INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg, |
1020 | inet_recvmsg, sock, msg, | |
1021 | msg_data_left(msg), flags); | |
1022 | if (trace_sock_recv_length_enabled()) | |
1023 | call_trace_sock_recv_length(sock->sk, ret, flags); | |
1024 | return ret; | |
1da177e4 LT |
1025 | } |
1026 | ||
85806af0 RD |
1027 | /** |
1028 | * sock_recvmsg - receive a message from @sock | |
1029 | * @sock: socket | |
1030 | * @msg: message to receive | |
1031 | * @flags: message flags | |
1032 | * | |
1033 | * Receives @msg from @sock, passing through LSM. Returns the total number | |
1034 | * of bytes received, or an error. | |
1035 | */ | |
2da62906 | 1036 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) |
a2e27255 | 1037 | { |
2da62906 | 1038 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); |
a2e27255 | 1039 | |
2da62906 | 1040 | return err ?: sock_recvmsg_nosec(sock, msg, flags); |
1da177e4 | 1041 | } |
c6d409cf | 1042 | EXPORT_SYMBOL(sock_recvmsg); |
1da177e4 | 1043 | |
c1249c0a | 1044 | /** |
8a3c245c PT |
1045 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
1046 | * @sock: The socket to receive the message from | |
1047 | * @msg: Received message | |
1048 | * @vec: Input s/g array for message data | |
1049 | * @num: Size of input s/g array | |
1050 | * @size: Number of bytes to read | |
1051 | * @flags: Message flags (MSG_DONTWAIT, etc...) | |
c1249c0a | 1052 | * |
8a3c245c PT |
1053 | * On return the msg structure contains the scatter/gather array passed in the |
1054 | * vec argument. The array is modified so that it consists of the unfilled | |
1055 | * portion of the original array. | |
c1249c0a | 1056 | * |
8a3c245c | 1057 | * The returned value is the total number of bytes received, or an error. |
c1249c0a | 1058 | */ |
8a3c245c | 1059 | |
89bddce5 SH |
1060 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
1061 | struct kvec *vec, size_t num, size_t size, int flags) | |
1da177e4 | 1062 | { |
1f466e1f | 1063 | msg->msg_control_is_user = false; |
de4eda9d | 1064 | iov_iter_kvec(&msg->msg_iter, ITER_DEST, vec, num, size); |
1f466e1f | 1065 | return sock_recvmsg(sock, msg, flags); |
1da177e4 | 1066 | } |
c6d409cf | 1067 | EXPORT_SYMBOL(kernel_recvmsg); |
1da177e4 | 1068 | |
ce1d4d3e CH |
1069 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
1070 | int offset, size_t size, loff_t *ppos, int more) | |
1da177e4 | 1071 | { |
1da177e4 LT |
1072 | struct socket *sock; |
1073 | int flags; | |
6e6eda44 | 1074 | int ret; |
1da177e4 | 1075 | |
ce1d4d3e CH |
1076 | sock = file->private_data; |
1077 | ||
35f9c09f ED |
1078 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
1079 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ | |
1080 | flags |= more; | |
ce1d4d3e | 1081 | |
6e6eda44 YC |
1082 | ret = kernel_sendpage(sock, page, offset, size, flags); |
1083 | ||
1084 | if (trace_sock_send_length_enabled()) | |
1085 | call_trace_sock_send_length(sock->sk, ret, 0); | |
1086 | return ret; | |
ce1d4d3e | 1087 | } |
1da177e4 | 1088 | |
9c55e01c | 1089 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
c6d409cf | 1090 | struct pipe_inode_info *pipe, size_t len, |
9c55e01c JA |
1091 | unsigned int flags) |
1092 | { | |
1093 | struct socket *sock = file->private_data; | |
1094 | ||
997b37da | 1095 | if (unlikely(!sock->ops->splice_read)) |
95506588 | 1096 | return generic_file_splice_read(file, ppos, pipe, len, flags); |
997b37da | 1097 | |
9c55e01c JA |
1098 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
1099 | } | |
1100 | ||
8ae5e030 | 1101 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) |
ce1d4d3e | 1102 | { |
6d652330 AV |
1103 | struct file *file = iocb->ki_filp; |
1104 | struct socket *sock = file->private_data; | |
0345f931 | 1105 | struct msghdr msg = {.msg_iter = *to, |
1106 | .msg_iocb = iocb}; | |
8ae5e030 | 1107 | ssize_t res; |
ce1d4d3e | 1108 | |
ebfcd895 | 1109 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
1110 | msg.msg_flags = MSG_DONTWAIT; |
1111 | ||
1112 | if (iocb->ki_pos != 0) | |
1da177e4 | 1113 | return -ESPIPE; |
027445c3 | 1114 | |
66ee59af | 1115 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ |
1da177e4 LT |
1116 | return 0; |
1117 | ||
2da62906 | 1118 | res = sock_recvmsg(sock, &msg, msg.msg_flags); |
8ae5e030 AV |
1119 | *to = msg.msg_iter; |
1120 | return res; | |
1da177e4 LT |
1121 | } |
1122 | ||
8ae5e030 | 1123 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ce1d4d3e | 1124 | { |
6d652330 AV |
1125 | struct file *file = iocb->ki_filp; |
1126 | struct socket *sock = file->private_data; | |
0345f931 | 1127 | struct msghdr msg = {.msg_iter = *from, |
1128 | .msg_iocb = iocb}; | |
8ae5e030 | 1129 | ssize_t res; |
1da177e4 | 1130 | |
8ae5e030 | 1131 | if (iocb->ki_pos != 0) |
ce1d4d3e | 1132 | return -ESPIPE; |
027445c3 | 1133 | |
ebfcd895 | 1134 | if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) |
8ae5e030 AV |
1135 | msg.msg_flags = MSG_DONTWAIT; |
1136 | ||
6d652330 AV |
1137 | if (sock->type == SOCK_SEQPACKET) |
1138 | msg.msg_flags |= MSG_EOR; | |
1139 | ||
d8725c86 | 1140 | res = sock_sendmsg(sock, &msg); |
8ae5e030 AV |
1141 | *from = msg.msg_iter; |
1142 | return res; | |
1da177e4 LT |
1143 | } |
1144 | ||
1da177e4 LT |
1145 | /* |
1146 | * Atomic setting of ioctl hooks to avoid race | |
1147 | * with module unload. | |
1148 | */ | |
1149 | ||
4a3e2f71 | 1150 | static DEFINE_MUTEX(br_ioctl_mutex); |
ad2f99ae AB |
1151 | static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br, |
1152 | unsigned int cmd, struct ifreq *ifr, | |
1153 | void __user *uarg); | |
1da177e4 | 1154 | |
ad2f99ae AB |
1155 | void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br, |
1156 | unsigned int cmd, struct ifreq *ifr, | |
1157 | void __user *uarg)) | |
1da177e4 | 1158 | { |
4a3e2f71 | 1159 | mutex_lock(&br_ioctl_mutex); |
1da177e4 | 1160 | br_ioctl_hook = hook; |
4a3e2f71 | 1161 | mutex_unlock(&br_ioctl_mutex); |
1da177e4 LT |
1162 | } |
1163 | EXPORT_SYMBOL(brioctl_set); | |
1164 | ||
ad2f99ae AB |
1165 | int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd, |
1166 | struct ifreq *ifr, void __user *uarg) | |
1167 | { | |
1168 | int err = -ENOPKG; | |
1169 | ||
1170 | if (!br_ioctl_hook) | |
1171 | request_module("bridge"); | |
1172 | ||
1173 | mutex_lock(&br_ioctl_mutex); | |
1174 | if (br_ioctl_hook) | |
1175 | err = br_ioctl_hook(net, br, cmd, ifr, uarg); | |
1176 | mutex_unlock(&br_ioctl_mutex); | |
1177 | ||
1178 | return err; | |
1179 | } | |
1180 | ||
4a3e2f71 | 1181 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
881d966b | 1182 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
1da177e4 | 1183 | |
881d966b | 1184 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
1da177e4 | 1185 | { |
4a3e2f71 | 1186 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1187 | vlan_ioctl_hook = hook; |
4a3e2f71 | 1188 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 LT |
1189 | } |
1190 | EXPORT_SYMBOL(vlan_ioctl_set); | |
1191 | ||
6b96018b | 1192 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
63ff03ab | 1193 | unsigned int cmd, unsigned long arg) |
6b96018b | 1194 | { |
876f0bf9 AB |
1195 | struct ifreq ifr; |
1196 | bool need_copyout; | |
6b96018b AB |
1197 | int err; |
1198 | void __user *argp = (void __user *)arg; | |
a554bf96 | 1199 | void __user *data; |
6b96018b AB |
1200 | |
1201 | err = sock->ops->ioctl(sock, cmd, arg); | |
1202 | ||
1203 | /* | |
1204 | * If this ioctl is unknown try to hand it down | |
1205 | * to the NIC driver. | |
1206 | */ | |
36fd633e AV |
1207 | if (err != -ENOIOCTLCMD) |
1208 | return err; | |
6b96018b | 1209 | |
29ce8f97 JK |
1210 | if (!is_socket_ioctl_cmd(cmd)) |
1211 | return -ENOTTY; | |
1212 | ||
a554bf96 | 1213 | if (get_user_ifreq(&ifr, &data, argp)) |
876f0bf9 | 1214 | return -EFAULT; |
a554bf96 | 1215 | err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); |
876f0bf9 | 1216 | if (!err && need_copyout) |
a554bf96 | 1217 | if (put_user_ifreq(&ifr, argp)) |
44c02a2c | 1218 | return -EFAULT; |
876f0bf9 | 1219 | |
6b96018b AB |
1220 | return err; |
1221 | } | |
1222 | ||
1da177e4 LT |
1223 | /* |
1224 | * With an ioctl, arg may well be a user mode pointer, but we don't know | |
1225 | * what to do with it - that's up to the protocol still. | |
1226 | */ | |
1227 | ||
1228 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
1229 | { | |
1230 | struct socket *sock; | |
881d966b | 1231 | struct sock *sk; |
1da177e4 LT |
1232 | void __user *argp = (void __user *)arg; |
1233 | int pid, err; | |
881d966b | 1234 | struct net *net; |
1da177e4 | 1235 | |
b69aee04 | 1236 | sock = file->private_data; |
881d966b | 1237 | sk = sock->sk; |
3b1e0a65 | 1238 | net = sock_net(sk); |
44c02a2c AV |
1239 | if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { |
1240 | struct ifreq ifr; | |
a554bf96 | 1241 | void __user *data; |
44c02a2c | 1242 | bool need_copyout; |
a554bf96 | 1243 | if (get_user_ifreq(&ifr, &data, argp)) |
44c02a2c | 1244 | return -EFAULT; |
a554bf96 | 1245 | err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); |
44c02a2c | 1246 | if (!err && need_copyout) |
a554bf96 | 1247 | if (put_user_ifreq(&ifr, argp)) |
44c02a2c | 1248 | return -EFAULT; |
1da177e4 | 1249 | } else |
3d23e349 | 1250 | #ifdef CONFIG_WEXT_CORE |
1da177e4 | 1251 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
b1b0c245 | 1252 | err = wext_handle_ioctl(net, cmd, argp); |
1da177e4 | 1253 | } else |
3d23e349 | 1254 | #endif |
89bddce5 | 1255 | switch (cmd) { |
1da177e4 LT |
1256 | case FIOSETOWN: |
1257 | case SIOCSPGRP: | |
1258 | err = -EFAULT; | |
1259 | if (get_user(pid, (int __user *)argp)) | |
1260 | break; | |
393cc3f5 | 1261 | err = f_setown(sock->file, pid, 1); |
1da177e4 LT |
1262 | break; |
1263 | case FIOGETOWN: | |
1264 | case SIOCGPGRP: | |
609d7fa9 | 1265 | err = put_user(f_getown(sock->file), |
89bddce5 | 1266 | (int __user *)argp); |
1da177e4 LT |
1267 | break; |
1268 | case SIOCGIFBR: | |
1269 | case SIOCSIFBR: | |
1270 | case SIOCBRADDBR: | |
1271 | case SIOCBRDELBR: | |
ad2f99ae | 1272 | err = br_ioctl_call(net, NULL, cmd, NULL, argp); |
1da177e4 LT |
1273 | break; |
1274 | case SIOCGIFVLAN: | |
1275 | case SIOCSIFVLAN: | |
1276 | err = -ENOPKG; | |
1277 | if (!vlan_ioctl_hook) | |
1278 | request_module("8021q"); | |
1279 | ||
4a3e2f71 | 1280 | mutex_lock(&vlan_ioctl_mutex); |
1da177e4 | 1281 | if (vlan_ioctl_hook) |
881d966b | 1282 | err = vlan_ioctl_hook(net, argp); |
4a3e2f71 | 1283 | mutex_unlock(&vlan_ioctl_mutex); |
1da177e4 | 1284 | break; |
c62cce2c AV |
1285 | case SIOCGSKNS: |
1286 | err = -EPERM; | |
1287 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1288 | break; | |
1289 | ||
1290 | err = open_related_ns(&net->ns, get_net_ns); | |
1291 | break; | |
0768e170 AB |
1292 | case SIOCGSTAMP_OLD: |
1293 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
1294 | if (!sock->ops->gettstamp) { |
1295 | err = -ENOIOCTLCMD; | |
1296 | break; | |
1297 | } | |
1298 | err = sock->ops->gettstamp(sock, argp, | |
0768e170 AB |
1299 | cmd == SIOCGSTAMP_OLD, |
1300 | !IS_ENABLED(CONFIG_64BIT)); | |
60747828 | 1301 | break; |
0768e170 AB |
1302 | case SIOCGSTAMP_NEW: |
1303 | case SIOCGSTAMPNS_NEW: | |
1304 | if (!sock->ops->gettstamp) { | |
1305 | err = -ENOIOCTLCMD; | |
1306 | break; | |
1307 | } | |
1308 | err = sock->ops->gettstamp(sock, argp, | |
1309 | cmd == SIOCGSTAMP_NEW, | |
1310 | false); | |
c7cbdbf2 | 1311 | break; |
876f0bf9 AB |
1312 | |
1313 | case SIOCGIFCONF: | |
1314 | err = dev_ifconf(net, argp); | |
1315 | break; | |
1316 | ||
1da177e4 | 1317 | default: |
63ff03ab | 1318 | err = sock_do_ioctl(net, sock, cmd, arg); |
1da177e4 | 1319 | break; |
89bddce5 | 1320 | } |
1da177e4 LT |
1321 | return err; |
1322 | } | |
1323 | ||
8a3c245c PT |
1324 | /** |
1325 | * sock_create_lite - creates a socket | |
1326 | * @family: protocol family (AF_INET, ...) | |
1327 | * @type: communication type (SOCK_STREAM, ...) | |
1328 | * @protocol: protocol (0, ...) | |
1329 | * @res: new socket | |
1330 | * | |
1331 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1332 | * The new socket initialization is not complete, see kernel_accept(). | |
1333 | * Returns 0 or an error. On failure @res is set to %NULL. | |
1334 | * This function internally uses GFP_KERNEL. | |
1335 | */ | |
1336 | ||
1da177e4 LT |
1337 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
1338 | { | |
1339 | int err; | |
1340 | struct socket *sock = NULL; | |
89bddce5 | 1341 | |
1da177e4 LT |
1342 | err = security_socket_create(family, type, protocol, 1); |
1343 | if (err) | |
1344 | goto out; | |
1345 | ||
1346 | sock = sock_alloc(); | |
1347 | if (!sock) { | |
1348 | err = -ENOMEM; | |
1349 | goto out; | |
1350 | } | |
1351 | ||
1da177e4 | 1352 | sock->type = type; |
7420ed23 VY |
1353 | err = security_socket_post_create(sock, family, type, protocol, 1); |
1354 | if (err) | |
1355 | goto out_release; | |
1356 | ||
1da177e4 LT |
1357 | out: |
1358 | *res = sock; | |
1359 | return err; | |
7420ed23 VY |
1360 | out_release: |
1361 | sock_release(sock); | |
1362 | sock = NULL; | |
1363 | goto out; | |
1da177e4 | 1364 | } |
c6d409cf | 1365 | EXPORT_SYMBOL(sock_create_lite); |
1da177e4 LT |
1366 | |
1367 | /* No kernel lock held - perfect */ | |
ade994f4 | 1368 | static __poll_t sock_poll(struct file *file, poll_table *wait) |
1da177e4 | 1369 | { |
3cafb376 | 1370 | struct socket *sock = file->private_data; |
a331de3b | 1371 | __poll_t events = poll_requested_events(wait), flag = 0; |
2d48d67f | 1372 | |
e88958e6 CH |
1373 | if (!sock->ops->poll) |
1374 | return 0; | |
f641f13b | 1375 | |
a331de3b CH |
1376 | if (sk_can_busy_loop(sock->sk)) { |
1377 | /* poll once if requested by the syscall */ | |
1378 | if (events & POLL_BUSY_LOOP) | |
1379 | sk_busy_loop(sock->sk, 1); | |
1380 | ||
1381 | /* if this socket can poll_ll, tell the system call */ | |
1382 | flag = POLL_BUSY_LOOP; | |
1383 | } | |
1384 | ||
1385 | return sock->ops->poll(file, sock, wait) | flag; | |
1da177e4 LT |
1386 | } |
1387 | ||
89bddce5 | 1388 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4 | 1389 | { |
b69aee04 | 1390 | struct socket *sock = file->private_data; |
1da177e4 LT |
1391 | |
1392 | return sock->ops->mmap(file, sock, vma); | |
1393 | } | |
1394 | ||
20380731 | 1395 | static int sock_close(struct inode *inode, struct file *filp) |
1da177e4 | 1396 | { |
6d8c50dc | 1397 | __sock_release(SOCKET_I(inode), inode); |
1da177e4 LT |
1398 | return 0; |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Update the socket async list | |
1403 | * | |
1404 | * Fasync_list locking strategy. | |
1405 | * | |
1406 | * 1. fasync_list is modified only under process context socket lock | |
1407 | * i.e. under semaphore. | |
1408 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) | |
989a2979 | 1409 | * or under socket lock |
1da177e4 LT |
1410 | */ |
1411 | ||
1412 | static int sock_fasync(int fd, struct file *filp, int on) | |
1413 | { | |
989a2979 ED |
1414 | struct socket *sock = filp->private_data; |
1415 | struct sock *sk = sock->sk; | |
333f7909 | 1416 | struct socket_wq *wq = &sock->wq; |
1da177e4 | 1417 | |
989a2979 | 1418 | if (sk == NULL) |
1da177e4 | 1419 | return -EINVAL; |
1da177e4 LT |
1420 | |
1421 | lock_sock(sk); | |
eaefd110 | 1422 | fasync_helper(fd, filp, on, &wq->fasync_list); |
1da177e4 | 1423 | |
eaefd110 | 1424 | if (!wq->fasync_list) |
989a2979 ED |
1425 | sock_reset_flag(sk, SOCK_FASYNC); |
1426 | else | |
bcdce719 | 1427 | sock_set_flag(sk, SOCK_FASYNC); |
1da177e4 | 1428 | |
989a2979 | 1429 | release_sock(sk); |
1da177e4 LT |
1430 | return 0; |
1431 | } | |
1432 | ||
ceb5d58b | 1433 | /* This function may be called only under rcu_lock */ |
1da177e4 | 1434 | |
ceb5d58b | 1435 | int sock_wake_async(struct socket_wq *wq, int how, int band) |
1da177e4 | 1436 | { |
ceb5d58b | 1437 | if (!wq || !wq->fasync_list) |
1da177e4 | 1438 | return -1; |
ceb5d58b | 1439 | |
89bddce5 | 1440 | switch (how) { |
8d8ad9d7 | 1441 | case SOCK_WAKE_WAITD: |
ceb5d58b | 1442 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) |
1da177e4 LT |
1443 | break; |
1444 | goto call_kill; | |
8d8ad9d7 | 1445 | case SOCK_WAKE_SPACE: |
ceb5d58b | 1446 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) |
1da177e4 | 1447 | break; |
7c7ab580 | 1448 | fallthrough; |
8d8ad9d7 | 1449 | case SOCK_WAKE_IO: |
89bddce5 | 1450 | call_kill: |
43815482 | 1451 | kill_fasync(&wq->fasync_list, SIGIO, band); |
1da177e4 | 1452 | break; |
8d8ad9d7 | 1453 | case SOCK_WAKE_URG: |
43815482 | 1454 | kill_fasync(&wq->fasync_list, SIGURG, band); |
1da177e4 | 1455 | } |
ceb5d58b | 1456 | |
1da177e4 LT |
1457 | return 0; |
1458 | } | |
c6d409cf | 1459 | EXPORT_SYMBOL(sock_wake_async); |
1da177e4 | 1460 | |
8a3c245c PT |
1461 | /** |
1462 | * __sock_create - creates a socket | |
1463 | * @net: net namespace | |
1464 | * @family: protocol family (AF_INET, ...) | |
1465 | * @type: communication type (SOCK_STREAM, ...) | |
1466 | * @protocol: protocol (0, ...) | |
1467 | * @res: new socket | |
1468 | * @kern: boolean for kernel space sockets | |
1469 | * | |
1470 | * Creates a new socket and assigns it to @res, passing through LSM. | |
1471 | * Returns 0 or an error. On failure @res is set to %NULL. @kern must | |
1472 | * be set to true if the socket resides in kernel space. | |
1473 | * This function internally uses GFP_KERNEL. | |
1474 | */ | |
1475 | ||
721db93a | 1476 | int __sock_create(struct net *net, int family, int type, int protocol, |
89bddce5 | 1477 | struct socket **res, int kern) |
1da177e4 LT |
1478 | { |
1479 | int err; | |
1480 | struct socket *sock; | |
55737fda | 1481 | const struct net_proto_family *pf; |
1da177e4 LT |
1482 | |
1483 | /* | |
89bddce5 | 1484 | * Check protocol is in range |
1da177e4 LT |
1485 | */ |
1486 | if (family < 0 || family >= NPROTO) | |
1487 | return -EAFNOSUPPORT; | |
1488 | if (type < 0 || type >= SOCK_MAX) | |
1489 | return -EINVAL; | |
1490 | ||
1491 | /* Compatibility. | |
1492 | ||
1493 | This uglymoron is moved from INET layer to here to avoid | |
1494 | deadlock in module load. | |
1495 | */ | |
1496 | if (family == PF_INET && type == SOCK_PACKET) { | |
f3c98690 | 1497 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
1498 | current->comm); | |
1da177e4 LT |
1499 | family = PF_PACKET; |
1500 | } | |
1501 | ||
1502 | err = security_socket_create(family, type, protocol, kern); | |
1503 | if (err) | |
1504 | return err; | |
89bddce5 | 1505 | |
55737fda SH |
1506 | /* |
1507 | * Allocate the socket and allow the family to set things up. if | |
1508 | * the protocol is 0, the family is instructed to select an appropriate | |
1509 | * default. | |
1510 | */ | |
1511 | sock = sock_alloc(); | |
1512 | if (!sock) { | |
e87cc472 | 1513 | net_warn_ratelimited("socket: no more sockets\n"); |
55737fda SH |
1514 | return -ENFILE; /* Not exactly a match, but its the |
1515 | closest posix thing */ | |
1516 | } | |
1517 | ||
1518 | sock->type = type; | |
1519 | ||
95a5afca | 1520 | #ifdef CONFIG_MODULES |
89bddce5 SH |
1521 | /* Attempt to load a protocol module if the find failed. |
1522 | * | |
1523 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user | |
1da177e4 LT |
1524 | * requested real, full-featured networking support upon configuration. |
1525 | * Otherwise module support will break! | |
1526 | */ | |
190683a9 | 1527 | if (rcu_access_pointer(net_families[family]) == NULL) |
89bddce5 | 1528 | request_module("net-pf-%d", family); |
1da177e4 LT |
1529 | #endif |
1530 | ||
55737fda SH |
1531 | rcu_read_lock(); |
1532 | pf = rcu_dereference(net_families[family]); | |
1533 | err = -EAFNOSUPPORT; | |
1534 | if (!pf) | |
1535 | goto out_release; | |
1da177e4 LT |
1536 | |
1537 | /* | |
1538 | * We will call the ->create function, that possibly is in a loadable | |
1539 | * module, so we have to bump that loadable module refcnt first. | |
1540 | */ | |
55737fda | 1541 | if (!try_module_get(pf->owner)) |
1da177e4 LT |
1542 | goto out_release; |
1543 | ||
55737fda SH |
1544 | /* Now protected by module ref count */ |
1545 | rcu_read_unlock(); | |
1546 | ||
3f378b68 | 1547 | err = pf->create(net, sock, protocol, kern); |
55737fda | 1548 | if (err < 0) |
1da177e4 | 1549 | goto out_module_put; |
a79af59e | 1550 | |
1da177e4 LT |
1551 | /* |
1552 | * Now to bump the refcnt of the [loadable] module that owns this | |
1553 | * socket at sock_release time we decrement its refcnt. | |
1554 | */ | |
55737fda SH |
1555 | if (!try_module_get(sock->ops->owner)) |
1556 | goto out_module_busy; | |
1557 | ||
1da177e4 LT |
1558 | /* |
1559 | * Now that we're done with the ->create function, the [loadable] | |
1560 | * module can have its refcnt decremented | |
1561 | */ | |
55737fda | 1562 | module_put(pf->owner); |
7420ed23 VY |
1563 | err = security_socket_post_create(sock, family, type, protocol, kern); |
1564 | if (err) | |
3b185525 | 1565 | goto out_sock_release; |
55737fda | 1566 | *res = sock; |
1da177e4 | 1567 | |
55737fda SH |
1568 | return 0; |
1569 | ||
1570 | out_module_busy: | |
1571 | err = -EAFNOSUPPORT; | |
1da177e4 | 1572 | out_module_put: |
55737fda SH |
1573 | sock->ops = NULL; |
1574 | module_put(pf->owner); | |
1575 | out_sock_release: | |
1da177e4 | 1576 | sock_release(sock); |
55737fda SH |
1577 | return err; |
1578 | ||
1579 | out_release: | |
1580 | rcu_read_unlock(); | |
1581 | goto out_sock_release; | |
1da177e4 | 1582 | } |
721db93a | 1583 | EXPORT_SYMBOL(__sock_create); |
1da177e4 | 1584 | |
8a3c245c PT |
1585 | /** |
1586 | * sock_create - creates a socket | |
1587 | * @family: protocol family (AF_INET, ...) | |
1588 | * @type: communication type (SOCK_STREAM, ...) | |
1589 | * @protocol: protocol (0, ...) | |
1590 | * @res: new socket | |
1591 | * | |
1592 | * A wrapper around __sock_create(). | |
1593 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1594 | */ | |
1595 | ||
1da177e4 LT |
1596 | int sock_create(int family, int type, int protocol, struct socket **res) |
1597 | { | |
1b8d7ae4 | 1598 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
1da177e4 | 1599 | } |
c6d409cf | 1600 | EXPORT_SYMBOL(sock_create); |
1da177e4 | 1601 | |
8a3c245c PT |
1602 | /** |
1603 | * sock_create_kern - creates a socket (kernel space) | |
1604 | * @net: net namespace | |
1605 | * @family: protocol family (AF_INET, ...) | |
1606 | * @type: communication type (SOCK_STREAM, ...) | |
1607 | * @protocol: protocol (0, ...) | |
1608 | * @res: new socket | |
1609 | * | |
1610 | * A wrapper around __sock_create(). | |
1611 | * Returns 0 or an error. This function internally uses GFP_KERNEL. | |
1612 | */ | |
1613 | ||
eeb1bd5c | 1614 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) |
1da177e4 | 1615 | { |
eeb1bd5c | 1616 | return __sock_create(net, family, type, protocol, res, 1); |
1da177e4 | 1617 | } |
c6d409cf | 1618 | EXPORT_SYMBOL(sock_create_kern); |
1da177e4 | 1619 | |
da214a47 | 1620 | static struct socket *__sys_socket_create(int family, int type, int protocol) |
1da177e4 | 1621 | { |
1da177e4 | 1622 | struct socket *sock; |
da214a47 | 1623 | int retval; |
a677a039 | 1624 | |
e38b36f3 UD |
1625 | /* Check the SOCK_* constants for consistency. */ |
1626 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); | |
1627 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); | |
1628 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); | |
1629 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); | |
1630 | ||
da214a47 JA |
1631 | if ((type & ~SOCK_TYPE_MASK) & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
1632 | return ERR_PTR(-EINVAL); | |
a677a039 | 1633 | type &= SOCK_TYPE_MASK; |
1da177e4 | 1634 | |
da214a47 JA |
1635 | retval = sock_create(family, type, protocol, &sock); |
1636 | if (retval < 0) | |
1637 | return ERR_PTR(retval); | |
1638 | ||
1639 | return sock; | |
1640 | } | |
1641 | ||
1642 | struct file *__sys_socket_file(int family, int type, int protocol) | |
1643 | { | |
1644 | struct socket *sock; | |
da214a47 JA |
1645 | int flags; |
1646 | ||
1647 | sock = __sys_socket_create(family, type, protocol); | |
1648 | if (IS_ERR(sock)) | |
1649 | return ERR_CAST(sock); | |
1650 | ||
1651 | flags = type & ~SOCK_TYPE_MASK; | |
aaca0bdc UD |
1652 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1653 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1654 | ||
649c15c7 | 1655 | return sock_alloc_file(sock, flags, NULL); |
da214a47 JA |
1656 | } |
1657 | ||
1658 | int __sys_socket(int family, int type, int protocol) | |
1659 | { | |
1660 | struct socket *sock; | |
1661 | int flags; | |
1662 | ||
1663 | sock = __sys_socket_create(family, type, protocol); | |
1664 | if (IS_ERR(sock)) | |
1665 | return PTR_ERR(sock); | |
1666 | ||
1667 | flags = type & ~SOCK_TYPE_MASK; | |
1668 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1669 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1da177e4 | 1670 | |
8e1611e2 | 1671 | return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
1da177e4 LT |
1672 | } |
1673 | ||
9d6a15c3 DB |
1674 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
1675 | { | |
1676 | return __sys_socket(family, type, protocol); | |
1677 | } | |
1678 | ||
1da177e4 LT |
1679 | /* |
1680 | * Create a pair of connected sockets. | |
1681 | */ | |
1682 | ||
6debc8d8 | 1683 | int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) |
1da177e4 LT |
1684 | { |
1685 | struct socket *sock1, *sock2; | |
1686 | int fd1, fd2, err; | |
db349509 | 1687 | struct file *newfile1, *newfile2; |
a677a039 UD |
1688 | int flags; |
1689 | ||
1690 | flags = type & ~SOCK_TYPE_MASK; | |
77d27200 | 1691 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
a677a039 UD |
1692 | return -EINVAL; |
1693 | type &= SOCK_TYPE_MASK; | |
1da177e4 | 1694 | |
aaca0bdc UD |
1695 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
1696 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1697 | ||
016a266b AV |
1698 | /* |
1699 | * reserve descriptors and make sure we won't fail | |
1700 | * to return them to userland. | |
1701 | */ | |
1702 | fd1 = get_unused_fd_flags(flags); | |
1703 | if (unlikely(fd1 < 0)) | |
1704 | return fd1; | |
1705 | ||
1706 | fd2 = get_unused_fd_flags(flags); | |
1707 | if (unlikely(fd2 < 0)) { | |
1708 | put_unused_fd(fd1); | |
1709 | return fd2; | |
1710 | } | |
1711 | ||
1712 | err = put_user(fd1, &usockvec[0]); | |
1713 | if (err) | |
1714 | goto out; | |
1715 | ||
1716 | err = put_user(fd2, &usockvec[1]); | |
1717 | if (err) | |
1718 | goto out; | |
1719 | ||
1da177e4 LT |
1720 | /* |
1721 | * Obtain the first socket and check if the underlying protocol | |
1722 | * supports the socketpair call. | |
1723 | */ | |
1724 | ||
1725 | err = sock_create(family, type, protocol, &sock1); | |
016a266b | 1726 | if (unlikely(err < 0)) |
1da177e4 LT |
1727 | goto out; |
1728 | ||
1729 | err = sock_create(family, type, protocol, &sock2); | |
016a266b AV |
1730 | if (unlikely(err < 0)) { |
1731 | sock_release(sock1); | |
1732 | goto out; | |
bf3c23d1 | 1733 | } |
d73aa286 | 1734 | |
d47cd945 DH |
1735 | err = security_socket_socketpair(sock1, sock2); |
1736 | if (unlikely(err)) { | |
1737 | sock_release(sock2); | |
1738 | sock_release(sock1); | |
1739 | goto out; | |
1740 | } | |
1741 | ||
016a266b AV |
1742 | err = sock1->ops->socketpair(sock1, sock2); |
1743 | if (unlikely(err < 0)) { | |
1744 | sock_release(sock2); | |
1745 | sock_release(sock1); | |
1746 | goto out; | |
28407630 AV |
1747 | } |
1748 | ||
aab174f0 | 1749 | newfile1 = sock_alloc_file(sock1, flags, NULL); |
b5ffe634 | 1750 | if (IS_ERR(newfile1)) { |
28407630 | 1751 | err = PTR_ERR(newfile1); |
016a266b AV |
1752 | sock_release(sock2); |
1753 | goto out; | |
28407630 AV |
1754 | } |
1755 | ||
aab174f0 | 1756 | newfile2 = sock_alloc_file(sock2, flags, NULL); |
28407630 AV |
1757 | if (IS_ERR(newfile2)) { |
1758 | err = PTR_ERR(newfile2); | |
016a266b AV |
1759 | fput(newfile1); |
1760 | goto out; | |
db349509 AV |
1761 | } |
1762 | ||
157cf649 | 1763 | audit_fd_pair(fd1, fd2); |
d73aa286 | 1764 | |
db349509 AV |
1765 | fd_install(fd1, newfile1); |
1766 | fd_install(fd2, newfile2); | |
d73aa286 | 1767 | return 0; |
1da177e4 | 1768 | |
016a266b | 1769 | out: |
d73aa286 | 1770 | put_unused_fd(fd2); |
d73aa286 | 1771 | put_unused_fd(fd1); |
1da177e4 LT |
1772 | return err; |
1773 | } | |
1774 | ||
6debc8d8 DB |
1775 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
1776 | int __user *, usockvec) | |
1777 | { | |
1778 | return __sys_socketpair(family, type, protocol, usockvec); | |
1779 | } | |
1780 | ||
1da177e4 LT |
1781 | /* |
1782 | * Bind a name to a socket. Nothing much to do here since it's | |
1783 | * the protocol's responsibility to handle the local address. | |
1784 | * | |
1785 | * We move the socket address to kernel space before we call | |
1786 | * the protocol layer (having also checked the address is ok). | |
1787 | */ | |
1788 | ||
a87d35d8 | 1789 | int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
1da177e4 LT |
1790 | { |
1791 | struct socket *sock; | |
230b1839 | 1792 | struct sockaddr_storage address; |
6cb153ca | 1793 | int err, fput_needed; |
1da177e4 | 1794 | |
89bddce5 | 1795 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
e71a4783 | 1796 | if (sock) { |
43db362d | 1797 | err = move_addr_to_kernel(umyaddr, addrlen, &address); |
068b88cc | 1798 | if (!err) { |
89bddce5 | 1799 | err = security_socket_bind(sock, |
230b1839 | 1800 | (struct sockaddr *)&address, |
89bddce5 | 1801 | addrlen); |
6cb153ca BL |
1802 | if (!err) |
1803 | err = sock->ops->bind(sock, | |
89bddce5 | 1804 | (struct sockaddr *) |
230b1839 | 1805 | &address, addrlen); |
1da177e4 | 1806 | } |
6cb153ca | 1807 | fput_light(sock->file, fput_needed); |
89bddce5 | 1808 | } |
1da177e4 LT |
1809 | return err; |
1810 | } | |
1811 | ||
a87d35d8 DB |
1812 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
1813 | { | |
1814 | return __sys_bind(fd, umyaddr, addrlen); | |
1815 | } | |
1816 | ||
1da177e4 LT |
1817 | /* |
1818 | * Perform a listen. Basically, we allow the protocol to do anything | |
1819 | * necessary for a listen, and if that works, we mark the socket as | |
1820 | * ready for listening. | |
1821 | */ | |
1822 | ||
25e290ee | 1823 | int __sys_listen(int fd, int backlog) |
1da177e4 LT |
1824 | { |
1825 | struct socket *sock; | |
6cb153ca | 1826 | int err, fput_needed; |
b8e1f9b5 | 1827 | int somaxconn; |
89bddce5 SH |
1828 | |
1829 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
1830 | if (sock) { | |
3c9ba81d | 1831 | somaxconn = READ_ONCE(sock_net(sock->sk)->core.sysctl_somaxconn); |
95c96174 | 1832 | if ((unsigned int)backlog > somaxconn) |
b8e1f9b5 | 1833 | backlog = somaxconn; |
1da177e4 LT |
1834 | |
1835 | err = security_socket_listen(sock, backlog); | |
6cb153ca BL |
1836 | if (!err) |
1837 | err = sock->ops->listen(sock, backlog); | |
1da177e4 | 1838 | |
6cb153ca | 1839 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
1840 | } |
1841 | return err; | |
1842 | } | |
1843 | ||
25e290ee DB |
1844 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
1845 | { | |
1846 | return __sys_listen(fd, backlog); | |
1847 | } | |
1848 | ||
d32f89da | 1849 | struct file *do_accept(struct file *file, unsigned file_flags, |
de2ea4b6 | 1850 | struct sockaddr __user *upeer_sockaddr, |
d32f89da | 1851 | int __user *upeer_addrlen, int flags) |
1da177e4 LT |
1852 | { |
1853 | struct socket *sock, *newsock; | |
39d8c1b6 | 1854 | struct file *newfile; |
d32f89da | 1855 | int err, len; |
230b1839 | 1856 | struct sockaddr_storage address; |
1da177e4 | 1857 | |
dba4a925 | 1858 | sock = sock_from_file(file); |
d32f89da PB |
1859 | if (!sock) |
1860 | return ERR_PTR(-ENOTSOCK); | |
1da177e4 | 1861 | |
c6d409cf ED |
1862 | newsock = sock_alloc(); |
1863 | if (!newsock) | |
d32f89da | 1864 | return ERR_PTR(-ENFILE); |
1da177e4 LT |
1865 | |
1866 | newsock->type = sock->type; | |
1867 | newsock->ops = sock->ops; | |
1868 | ||
1da177e4 LT |
1869 | /* |
1870 | * We don't need try_module_get here, as the listening socket (sock) | |
1871 | * has the protocol module (sock->ops->owner) held. | |
1872 | */ | |
1873 | __module_get(newsock->ops->owner); | |
1874 | ||
aab174f0 | 1875 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); |
d32f89da PB |
1876 | if (IS_ERR(newfile)) |
1877 | return newfile; | |
39d8c1b6 | 1878 | |
a79af59e FF |
1879 | err = security_socket_accept(sock, newsock); |
1880 | if (err) | |
39d8c1b6 | 1881 | goto out_fd; |
a79af59e | 1882 | |
de2ea4b6 JA |
1883 | err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags, |
1884 | false); | |
1da177e4 | 1885 | if (err < 0) |
39d8c1b6 | 1886 | goto out_fd; |
1da177e4 LT |
1887 | |
1888 | if (upeer_sockaddr) { | |
9b2c45d4 DV |
1889 | len = newsock->ops->getname(newsock, |
1890 | (struct sockaddr *)&address, 2); | |
1891 | if (len < 0) { | |
1da177e4 | 1892 | err = -ECONNABORTED; |
39d8c1b6 | 1893 | goto out_fd; |
1da177e4 | 1894 | } |
43db362d | 1895 | err = move_addr_to_user(&address, |
230b1839 | 1896 | len, upeer_sockaddr, upeer_addrlen); |
1da177e4 | 1897 | if (err < 0) |
39d8c1b6 | 1898 | goto out_fd; |
1da177e4 LT |
1899 | } |
1900 | ||
1901 | /* File flags are not inherited via accept() unlike another OSes. */ | |
d32f89da | 1902 | return newfile; |
39d8c1b6 | 1903 | out_fd: |
9606a216 | 1904 | fput(newfile); |
d32f89da PB |
1905 | return ERR_PTR(err); |
1906 | } | |
1907 | ||
c0424532 YD |
1908 | static int __sys_accept4_file(struct file *file, struct sockaddr __user *upeer_sockaddr, |
1909 | int __user *upeer_addrlen, int flags) | |
d32f89da PB |
1910 | { |
1911 | struct file *newfile; | |
1912 | int newfd; | |
1913 | ||
1914 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1915 | return -EINVAL; | |
1916 | ||
1917 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) | |
1918 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
de2ea4b6 | 1919 | |
c0424532 | 1920 | newfd = get_unused_fd_flags(flags); |
d32f89da PB |
1921 | if (unlikely(newfd < 0)) |
1922 | return newfd; | |
1923 | ||
c0424532 | 1924 | newfile = do_accept(file, 0, upeer_sockaddr, upeer_addrlen, |
d32f89da PB |
1925 | flags); |
1926 | if (IS_ERR(newfile)) { | |
1927 | put_unused_fd(newfd); | |
1928 | return PTR_ERR(newfile); | |
1929 | } | |
1930 | fd_install(newfd, newfile); | |
1931 | return newfd; | |
de2ea4b6 JA |
1932 | } |
1933 | ||
1934 | /* | |
1935 | * For accept, we attempt to create a new socket, set up the link | |
1936 | * with the client, wake up the client, then return the new | |
1937 | * connected fd. We collect the address of the connector in kernel | |
1938 | * space and move it to user at the very end. This is unclean because | |
1939 | * we open the socket then return an error. | |
1940 | * | |
1941 | * 1003.1g adds the ability to recvmsg() to query connection pending | |
1942 | * status to recvmsg. We need to add that support in a way thats | |
1943 | * clean when we restructure accept also. | |
1944 | */ | |
1945 | ||
1946 | int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, | |
1947 | int __user *upeer_addrlen, int flags) | |
1948 | { | |
1949 | int ret = -EBADF; | |
1950 | struct fd f; | |
1951 | ||
1952 | f = fdget(fd); | |
1953 | if (f.file) { | |
c0424532 YD |
1954 | ret = __sys_accept4_file(f.file, upeer_sockaddr, |
1955 | upeer_addrlen, flags); | |
6b07edeb | 1956 | fdput(f); |
de2ea4b6 JA |
1957 | } |
1958 | ||
1959 | return ret; | |
1da177e4 LT |
1960 | } |
1961 | ||
4541e805 DB |
1962 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1963 | int __user *, upeer_addrlen, int, flags) | |
1964 | { | |
1965 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); | |
1966 | } | |
1967 | ||
20f37034 HC |
1968 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
1969 | int __user *, upeer_addrlen) | |
aaca0bdc | 1970 | { |
4541e805 | 1971 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
aaca0bdc UD |
1972 | } |
1973 | ||
1da177e4 LT |
1974 | /* |
1975 | * Attempt to connect to a socket with the server address. The address | |
1976 | * is in user space so we verify it is OK and move it to kernel space. | |
1977 | * | |
1978 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to | |
1979 | * break bindings | |
1980 | * | |
1981 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and | |
1982 | * other SEQPACKET protocols that take time to connect() as it doesn't | |
1983 | * include the -EINPROGRESS status for such sockets. | |
1984 | */ | |
1985 | ||
f499a021 | 1986 | int __sys_connect_file(struct file *file, struct sockaddr_storage *address, |
bd3ded31 | 1987 | int addrlen, int file_flags) |
1da177e4 LT |
1988 | { |
1989 | struct socket *sock; | |
bd3ded31 | 1990 | int err; |
1da177e4 | 1991 | |
dba4a925 FR |
1992 | sock = sock_from_file(file); |
1993 | if (!sock) { | |
1994 | err = -ENOTSOCK; | |
1da177e4 | 1995 | goto out; |
dba4a925 | 1996 | } |
1da177e4 | 1997 | |
89bddce5 | 1998 | err = |
f499a021 | 1999 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); |
1da177e4 | 2000 | if (err) |
bd3ded31 | 2001 | goto out; |
1da177e4 | 2002 | |
f499a021 | 2003 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
bd3ded31 | 2004 | sock->file->f_flags | file_flags); |
1da177e4 LT |
2005 | out: |
2006 | return err; | |
2007 | } | |
2008 | ||
bd3ded31 JA |
2009 | int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) |
2010 | { | |
2011 | int ret = -EBADF; | |
2012 | struct fd f; | |
2013 | ||
2014 | f = fdget(fd); | |
2015 | if (f.file) { | |
f499a021 JA |
2016 | struct sockaddr_storage address; |
2017 | ||
2018 | ret = move_addr_to_kernel(uservaddr, addrlen, &address); | |
2019 | if (!ret) | |
2020 | ret = __sys_connect_file(f.file, &address, addrlen, 0); | |
6b07edeb | 2021 | fdput(f); |
bd3ded31 JA |
2022 | } |
2023 | ||
2024 | return ret; | |
2025 | } | |
2026 | ||
1387c2c2 DB |
2027 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
2028 | int, addrlen) | |
2029 | { | |
2030 | return __sys_connect(fd, uservaddr, addrlen); | |
2031 | } | |
2032 | ||
1da177e4 LT |
2033 | /* |
2034 | * Get the local address ('name') of a socket object. Move the obtained | |
2035 | * name to user space. | |
2036 | */ | |
2037 | ||
8882a107 DB |
2038 | int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
2039 | int __user *usockaddr_len) | |
1da177e4 LT |
2040 | { |
2041 | struct socket *sock; | |
230b1839 | 2042 | struct sockaddr_storage address; |
9b2c45d4 | 2043 | int err, fput_needed; |
89bddce5 | 2044 | |
6cb153ca | 2045 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 LT |
2046 | if (!sock) |
2047 | goto out; | |
2048 | ||
2049 | err = security_socket_getsockname(sock); | |
2050 | if (err) | |
2051 | goto out_put; | |
2052 | ||
9b2c45d4 DV |
2053 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); |
2054 | if (err < 0) | |
1da177e4 | 2055 | goto out_put; |
e44ef1d4 | 2056 | /* "err" is actually length in this case */ |
9b2c45d4 | 2057 | err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); |
1da177e4 LT |
2058 | |
2059 | out_put: | |
6cb153ca | 2060 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2061 | out: |
2062 | return err; | |
2063 | } | |
2064 | ||
8882a107 DB |
2065 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
2066 | int __user *, usockaddr_len) | |
2067 | { | |
2068 | return __sys_getsockname(fd, usockaddr, usockaddr_len); | |
2069 | } | |
2070 | ||
1da177e4 LT |
2071 | /* |
2072 | * Get the remote address ('name') of a socket object. Move the obtained | |
2073 | * name to user space. | |
2074 | */ | |
2075 | ||
b21c8f83 DB |
2076 | int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
2077 | int __user *usockaddr_len) | |
1da177e4 LT |
2078 | { |
2079 | struct socket *sock; | |
230b1839 | 2080 | struct sockaddr_storage address; |
9b2c45d4 | 2081 | int err, fput_needed; |
1da177e4 | 2082 | |
89bddce5 SH |
2083 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2084 | if (sock != NULL) { | |
1da177e4 LT |
2085 | err = security_socket_getpeername(sock); |
2086 | if (err) { | |
6cb153ca | 2087 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2088 | return err; |
2089 | } | |
2090 | ||
9b2c45d4 DV |
2091 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); |
2092 | if (err >= 0) | |
2093 | /* "err" is actually length in this case */ | |
2094 | err = move_addr_to_user(&address, err, usockaddr, | |
89bddce5 | 2095 | usockaddr_len); |
6cb153ca | 2096 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2097 | } |
2098 | return err; | |
2099 | } | |
2100 | ||
b21c8f83 DB |
2101 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
2102 | int __user *, usockaddr_len) | |
2103 | { | |
2104 | return __sys_getpeername(fd, usockaddr, usockaddr_len); | |
2105 | } | |
2106 | ||
1da177e4 LT |
2107 | /* |
2108 | * Send a datagram to a given address. We move the address into kernel | |
2109 | * space and check the user space data area is readable before invoking | |
2110 | * the protocol. | |
2111 | */ | |
211b634b DB |
2112 | int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, |
2113 | struct sockaddr __user *addr, int addr_len) | |
1da177e4 LT |
2114 | { |
2115 | struct socket *sock; | |
230b1839 | 2116 | struct sockaddr_storage address; |
1da177e4 LT |
2117 | int err; |
2118 | struct msghdr msg; | |
2119 | struct iovec iov; | |
6cb153ca | 2120 | int fput_needed; |
6cb153ca | 2121 | |
de4eda9d | 2122 | err = import_single_range(ITER_SOURCE, buff, len, &iov, &msg.msg_iter); |
602bd0e9 AV |
2123 | if (unlikely(err)) |
2124 | return err; | |
de0fa95c PE |
2125 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2126 | if (!sock) | |
4387ff75 | 2127 | goto out; |
6cb153ca | 2128 | |
89bddce5 | 2129 | msg.msg_name = NULL; |
89bddce5 SH |
2130 | msg.msg_control = NULL; |
2131 | msg.msg_controllen = 0; | |
2132 | msg.msg_namelen = 0; | |
7c701d92 | 2133 | msg.msg_ubuf = NULL; |
6cb153ca | 2134 | if (addr) { |
43db362d | 2135 | err = move_addr_to_kernel(addr, addr_len, &address); |
1da177e4 LT |
2136 | if (err < 0) |
2137 | goto out_put; | |
230b1839 | 2138 | msg.msg_name = (struct sockaddr *)&address; |
89bddce5 | 2139 | msg.msg_namelen = addr_len; |
1da177e4 LT |
2140 | } |
2141 | if (sock->file->f_flags & O_NONBLOCK) | |
2142 | flags |= MSG_DONTWAIT; | |
2143 | msg.msg_flags = flags; | |
d8725c86 | 2144 | err = sock_sendmsg(sock, &msg); |
1da177e4 | 2145 | |
89bddce5 | 2146 | out_put: |
de0fa95c | 2147 | fput_light(sock->file, fput_needed); |
4387ff75 | 2148 | out: |
1da177e4 LT |
2149 | return err; |
2150 | } | |
2151 | ||
211b634b DB |
2152 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
2153 | unsigned int, flags, struct sockaddr __user *, addr, | |
2154 | int, addr_len) | |
2155 | { | |
2156 | return __sys_sendto(fd, buff, len, flags, addr, addr_len); | |
2157 | } | |
2158 | ||
1da177e4 | 2159 | /* |
89bddce5 | 2160 | * Send a datagram down a socket. |
1da177e4 LT |
2161 | */ |
2162 | ||
3e0fa65f | 2163 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
95c96174 | 2164 | unsigned int, flags) |
1da177e4 | 2165 | { |
211b634b | 2166 | return __sys_sendto(fd, buff, len, flags, NULL, 0); |
1da177e4 LT |
2167 | } |
2168 | ||
2169 | /* | |
89bddce5 | 2170 | * Receive a frame from the socket and optionally record the address of the |
1da177e4 LT |
2171 | * sender. We verify the buffers are writable and if needed move the |
2172 | * sender address from kernel to user space. | |
2173 | */ | |
7a09e1eb DB |
2174 | int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, |
2175 | struct sockaddr __user *addr, int __user *addr_len) | |
1da177e4 | 2176 | { |
1228b34c ED |
2177 | struct sockaddr_storage address; |
2178 | struct msghdr msg = { | |
2179 | /* Save some cycles and don't copy the address if not needed */ | |
2180 | .msg_name = addr ? (struct sockaddr *)&address : NULL, | |
2181 | }; | |
1da177e4 LT |
2182 | struct socket *sock; |
2183 | struct iovec iov; | |
89bddce5 | 2184 | int err, err2; |
6cb153ca BL |
2185 | int fput_needed; |
2186 | ||
de4eda9d | 2187 | err = import_single_range(ITER_DEST, ubuf, size, &iov, &msg.msg_iter); |
602bd0e9 AV |
2188 | if (unlikely(err)) |
2189 | return err; | |
de0fa95c | 2190 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
1da177e4 | 2191 | if (!sock) |
de0fa95c | 2192 | goto out; |
1da177e4 | 2193 | |
1da177e4 LT |
2194 | if (sock->file->f_flags & O_NONBLOCK) |
2195 | flags |= MSG_DONTWAIT; | |
2da62906 | 2196 | err = sock_recvmsg(sock, &msg, flags); |
1da177e4 | 2197 | |
89bddce5 | 2198 | if (err >= 0 && addr != NULL) { |
43db362d | 2199 | err2 = move_addr_to_user(&address, |
230b1839 | 2200 | msg.msg_namelen, addr, addr_len); |
89bddce5 SH |
2201 | if (err2 < 0) |
2202 | err = err2; | |
1da177e4 | 2203 | } |
de0fa95c PE |
2204 | |
2205 | fput_light(sock->file, fput_needed); | |
4387ff75 | 2206 | out: |
1da177e4 LT |
2207 | return err; |
2208 | } | |
2209 | ||
7a09e1eb DB |
2210 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
2211 | unsigned int, flags, struct sockaddr __user *, addr, | |
2212 | int __user *, addr_len) | |
2213 | { | |
2214 | return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); | |
2215 | } | |
2216 | ||
1da177e4 | 2217 | /* |
89bddce5 | 2218 | * Receive a datagram from a socket. |
1da177e4 LT |
2219 | */ |
2220 | ||
b7c0ddf5 JG |
2221 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, |
2222 | unsigned int, flags) | |
1da177e4 | 2223 | { |
7a09e1eb | 2224 | return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
1da177e4 LT |
2225 | } |
2226 | ||
83f0c10b FW |
2227 | static bool sock_use_custom_sol_socket(const struct socket *sock) |
2228 | { | |
a5ef058d | 2229 | return test_bit(SOCK_CUSTOM_SOCKOPT, &sock->flags); |
83f0c10b FW |
2230 | } |
2231 | ||
1da177e4 LT |
2232 | /* |
2233 | * Set a socket option. Because we don't know the option lengths we have | |
2234 | * to pass the user mode parameter for the protocols to sort out. | |
2235 | */ | |
a7b75c5a | 2236 | int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval, |
55db9c0e | 2237 | int optlen) |
1da177e4 | 2238 | { |
519a8a6c | 2239 | sockptr_t optval = USER_SOCKPTR(user_optval); |
0d01da6a | 2240 | char *kernel_optval = NULL; |
6cb153ca | 2241 | int err, fput_needed; |
1da177e4 LT |
2242 | struct socket *sock; |
2243 | ||
2244 | if (optlen < 0) | |
2245 | return -EINVAL; | |
89bddce5 SH |
2246 | |
2247 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
4a367299 CH |
2248 | if (!sock) |
2249 | return err; | |
1da177e4 | 2250 | |
4a367299 CH |
2251 | err = security_socket_setsockopt(sock, level, optname); |
2252 | if (err) | |
2253 | goto out_put; | |
0d01da6a | 2254 | |
55db9c0e CH |
2255 | if (!in_compat_syscall()) |
2256 | err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname, | |
a7b75c5a | 2257 | user_optval, &optlen, |
55db9c0e | 2258 | &kernel_optval); |
4a367299 CH |
2259 | if (err < 0) |
2260 | goto out_put; | |
2261 | if (err > 0) { | |
2262 | err = 0; | |
2263 | goto out_put; | |
2264 | } | |
0d01da6a | 2265 | |
a7b75c5a CH |
2266 | if (kernel_optval) |
2267 | optval = KERNEL_SOCKPTR(kernel_optval); | |
4a367299 | 2268 | if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock)) |
a7b75c5a | 2269 | err = sock_setsockopt(sock, level, optname, optval, optlen); |
a44d9e72 CH |
2270 | else if (unlikely(!sock->ops->setsockopt)) |
2271 | err = -EOPNOTSUPP; | |
4a367299 CH |
2272 | else |
2273 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
89bddce5 | 2274 | optlen); |
a7b75c5a | 2275 | kfree(kernel_optval); |
4a367299 CH |
2276 | out_put: |
2277 | fput_light(sock->file, fput_needed); | |
1da177e4 LT |
2278 | return err; |
2279 | } | |
2280 | ||
cc36dca0 DB |
2281 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
2282 | char __user *, optval, int, optlen) | |
2283 | { | |
2284 | return __sys_setsockopt(fd, level, optname, optval, optlen); | |
2285 | } | |
2286 | ||
9cacf81f SF |
2287 | INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level, |
2288 | int optname)); | |
2289 | ||
1da177e4 LT |
2290 | /* |
2291 | * Get a socket option. Because we don't know the option lengths we have | |
2292 | * to pass a user mode parameter for the protocols to sort out. | |
2293 | */ | |
55db9c0e CH |
2294 | int __sys_getsockopt(int fd, int level, int optname, char __user *optval, |
2295 | int __user *optlen) | |
1da177e4 | 2296 | { |
ad4bf5f2 | 2297 | int max_optlen __maybe_unused; |
6cb153ca | 2298 | int err, fput_needed; |
1da177e4 LT |
2299 | struct socket *sock; |
2300 | ||
89bddce5 | 2301 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
d8a9b38f CH |
2302 | if (!sock) |
2303 | return err; | |
2304 | ||
2305 | err = security_socket_getsockopt(sock, level, optname); | |
2306 | if (err) | |
2307 | goto out_put; | |
1da177e4 | 2308 | |
55db9c0e CH |
2309 | if (!in_compat_syscall()) |
2310 | max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); | |
0d01da6a | 2311 | |
d8a9b38f CH |
2312 | if (level == SOL_SOCKET) |
2313 | err = sock_getsockopt(sock, level, optname, optval, optlen); | |
a44d9e72 CH |
2314 | else if (unlikely(!sock->ops->getsockopt)) |
2315 | err = -EOPNOTSUPP; | |
d8a9b38f CH |
2316 | else |
2317 | err = sock->ops->getsockopt(sock, level, optname, optval, | |
89bddce5 | 2318 | optlen); |
0d01da6a | 2319 | |
55db9c0e CH |
2320 | if (!in_compat_syscall()) |
2321 | err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, | |
2322 | optval, optlen, max_optlen, | |
2323 | err); | |
6cb153ca | 2324 | out_put: |
d8a9b38f | 2325 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2326 | return err; |
2327 | } | |
2328 | ||
13a2d70e DB |
2329 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
2330 | char __user *, optval, int __user *, optlen) | |
2331 | { | |
2332 | return __sys_getsockopt(fd, level, optname, optval, optlen); | |
2333 | } | |
2334 | ||
1da177e4 LT |
2335 | /* |
2336 | * Shutdown a socket. | |
2337 | */ | |
2338 | ||
b713c195 JA |
2339 | int __sys_shutdown_sock(struct socket *sock, int how) |
2340 | { | |
2341 | int err; | |
2342 | ||
2343 | err = security_socket_shutdown(sock, how); | |
2344 | if (!err) | |
2345 | err = sock->ops->shutdown(sock, how); | |
2346 | ||
2347 | return err; | |
2348 | } | |
2349 | ||
005a1aea | 2350 | int __sys_shutdown(int fd, int how) |
1da177e4 | 2351 | { |
6cb153ca | 2352 | int err, fput_needed; |
1da177e4 LT |
2353 | struct socket *sock; |
2354 | ||
89bddce5 SH |
2355 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
2356 | if (sock != NULL) { | |
b713c195 | 2357 | err = __sys_shutdown_sock(sock, how); |
6cb153ca | 2358 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2359 | } |
2360 | return err; | |
2361 | } | |
2362 | ||
005a1aea DB |
2363 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
2364 | { | |
2365 | return __sys_shutdown(fd, how); | |
2366 | } | |
2367 | ||
89bddce5 | 2368 | /* A couple of helpful macros for getting the address of the 32/64 bit |
1da177e4 LT |
2369 | * fields which are the same type (int / unsigned) on our platforms. |
2370 | */ | |
2371 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) | |
2372 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) | |
2373 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) | |
2374 | ||
c71d8ebe TH |
2375 | struct used_address { |
2376 | struct sockaddr_storage name; | |
2377 | unsigned int name_len; | |
2378 | }; | |
2379 | ||
7fa875b8 DY |
2380 | int __copy_msghdr(struct msghdr *kmsg, |
2381 | struct user_msghdr *msg, | |
2382 | struct sockaddr __user **save_addr) | |
1661bf36 | 2383 | { |
08adb7da AV |
2384 | ssize_t err; |
2385 | ||
1f466e1f | 2386 | kmsg->msg_control_is_user = true; |
1228b34c | 2387 | kmsg->msg_get_inq = 0; |
7fa875b8 DY |
2388 | kmsg->msg_control_user = msg->msg_control; |
2389 | kmsg->msg_controllen = msg->msg_controllen; | |
2390 | kmsg->msg_flags = msg->msg_flags; | |
ffb07550 | 2391 | |
7fa875b8 DY |
2392 | kmsg->msg_namelen = msg->msg_namelen; |
2393 | if (!msg->msg_name) | |
6a2a2b3a AS |
2394 | kmsg->msg_namelen = 0; |
2395 | ||
dbb490b9 ML |
2396 | if (kmsg->msg_namelen < 0) |
2397 | return -EINVAL; | |
2398 | ||
1661bf36 | 2399 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
db31c55a | 2400 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); |
08adb7da AV |
2401 | |
2402 | if (save_addr) | |
7fa875b8 | 2403 | *save_addr = msg->msg_name; |
08adb7da | 2404 | |
7fa875b8 | 2405 | if (msg->msg_name && kmsg->msg_namelen) { |
08adb7da | 2406 | if (!save_addr) { |
7fa875b8 | 2407 | err = move_addr_to_kernel(msg->msg_name, |
864d9664 | 2408 | kmsg->msg_namelen, |
08adb7da AV |
2409 | kmsg->msg_name); |
2410 | if (err < 0) | |
2411 | return err; | |
2412 | } | |
2413 | } else { | |
2414 | kmsg->msg_name = NULL; | |
2415 | kmsg->msg_namelen = 0; | |
2416 | } | |
2417 | ||
7fa875b8 | 2418 | if (msg->msg_iovlen > UIO_MAXIOV) |
08adb7da AV |
2419 | return -EMSGSIZE; |
2420 | ||
0345f931 | 2421 | kmsg->msg_iocb = NULL; |
7c701d92 | 2422 | kmsg->msg_ubuf = NULL; |
0a384abf JA |
2423 | return 0; |
2424 | } | |
2425 | ||
2426 | static int copy_msghdr_from_user(struct msghdr *kmsg, | |
2427 | struct user_msghdr __user *umsg, | |
2428 | struct sockaddr __user **save_addr, | |
2429 | struct iovec **iov) | |
2430 | { | |
2431 | struct user_msghdr msg; | |
2432 | ssize_t err; | |
2433 | ||
7fa875b8 DY |
2434 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) |
2435 | return -EFAULT; | |
2436 | ||
2437 | err = __copy_msghdr(kmsg, &msg, save_addr); | |
0a384abf JA |
2438 | if (err) |
2439 | return err; | |
0345f931 | 2440 | |
de4eda9d | 2441 | err = import_iovec(save_addr ? ITER_DEST : ITER_SOURCE, |
ffb07550 | 2442 | msg.msg_iov, msg.msg_iovlen, |
da184284 | 2443 | UIO_FASTIOV, iov, &kmsg->msg_iter); |
87e5e6da | 2444 | return err < 0 ? err : 0; |
1661bf36 DC |
2445 | } |
2446 | ||
4257c8ca JA |
2447 | static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys, |
2448 | unsigned int flags, struct used_address *used_address, | |
2449 | unsigned int allowed_msghdr_flags) | |
1da177e4 | 2450 | { |
b9d717a7 | 2451 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
846cc123 | 2452 | __aligned(sizeof(__kernel_size_t)); |
89bddce5 | 2453 | /* 20 is size of ipv6_pktinfo */ |
1da177e4 | 2454 | unsigned char *ctl_buf = ctl; |
d8725c86 | 2455 | int ctl_len; |
08adb7da | 2456 | ssize_t err; |
89bddce5 | 2457 | |
1da177e4 LT |
2458 | err = -ENOBUFS; |
2459 | ||
228e548e | 2460 | if (msg_sys->msg_controllen > INT_MAX) |
4257c8ca | 2461 | goto out; |
28a94d8f | 2462 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); |
228e548e | 2463 | ctl_len = msg_sys->msg_controllen; |
1da177e4 | 2464 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
89bddce5 | 2465 | err = |
228e548e | 2466 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
89bddce5 | 2467 | sizeof(ctl)); |
1da177e4 | 2468 | if (err) |
4257c8ca | 2469 | goto out; |
228e548e AB |
2470 | ctl_buf = msg_sys->msg_control; |
2471 | ctl_len = msg_sys->msg_controllen; | |
1da177e4 | 2472 | } else if (ctl_len) { |
ac4340fc DM |
2473 | BUILD_BUG_ON(sizeof(struct cmsghdr) != |
2474 | CMSG_ALIGN(sizeof(struct cmsghdr))); | |
89bddce5 | 2475 | if (ctl_len > sizeof(ctl)) { |
1da177e4 | 2476 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
89bddce5 | 2477 | if (ctl_buf == NULL) |
4257c8ca | 2478 | goto out; |
1da177e4 LT |
2479 | } |
2480 | err = -EFAULT; | |
1f466e1f | 2481 | if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len)) |
1da177e4 | 2482 | goto out_freectl; |
228e548e | 2483 | msg_sys->msg_control = ctl_buf; |
1f466e1f | 2484 | msg_sys->msg_control_is_user = false; |
1da177e4 | 2485 | } |
228e548e | 2486 | msg_sys->msg_flags = flags; |
1da177e4 LT |
2487 | |
2488 | if (sock->file->f_flags & O_NONBLOCK) | |
228e548e | 2489 | msg_sys->msg_flags |= MSG_DONTWAIT; |
c71d8ebe TH |
2490 | /* |
2491 | * If this is sendmmsg() and current destination address is same as | |
2492 | * previously succeeded address, omit asking LSM's decision. | |
2493 | * used_address->name_len is initialized to UINT_MAX so that the first | |
2494 | * destination address never matches. | |
2495 | */ | |
bc909d9d MD |
2496 | if (used_address && msg_sys->msg_name && |
2497 | used_address->name_len == msg_sys->msg_namelen && | |
2498 | !memcmp(&used_address->name, msg_sys->msg_name, | |
c71d8ebe | 2499 | used_address->name_len)) { |
d8725c86 | 2500 | err = sock_sendmsg_nosec(sock, msg_sys); |
c71d8ebe TH |
2501 | goto out_freectl; |
2502 | } | |
d8725c86 | 2503 | err = sock_sendmsg(sock, msg_sys); |
c71d8ebe TH |
2504 | /* |
2505 | * If this is sendmmsg() and sending to current destination address was | |
2506 | * successful, remember it. | |
2507 | */ | |
2508 | if (used_address && err >= 0) { | |
2509 | used_address->name_len = msg_sys->msg_namelen; | |
bc909d9d MD |
2510 | if (msg_sys->msg_name) |
2511 | memcpy(&used_address->name, msg_sys->msg_name, | |
2512 | used_address->name_len); | |
c71d8ebe | 2513 | } |
1da177e4 LT |
2514 | |
2515 | out_freectl: | |
89bddce5 | 2516 | if (ctl_buf != ctl) |
1da177e4 | 2517 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
4257c8ca JA |
2518 | out: |
2519 | return err; | |
2520 | } | |
2521 | ||
03b1230c JA |
2522 | int sendmsg_copy_msghdr(struct msghdr *msg, |
2523 | struct user_msghdr __user *umsg, unsigned flags, | |
2524 | struct iovec **iov) | |
4257c8ca JA |
2525 | { |
2526 | int err; | |
2527 | ||
2528 | if (flags & MSG_CMSG_COMPAT) { | |
2529 | struct compat_msghdr __user *msg_compat; | |
2530 | ||
2531 | msg_compat = (struct compat_msghdr __user *) umsg; | |
2532 | err = get_compat_msghdr(msg, msg_compat, NULL, iov); | |
2533 | } else { | |
2534 | err = copy_msghdr_from_user(msg, umsg, NULL, iov); | |
2535 | } | |
2536 | if (err < 0) | |
2537 | return err; | |
2538 | ||
2539 | return 0; | |
2540 | } | |
2541 | ||
2542 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2543 | struct msghdr *msg_sys, unsigned int flags, | |
2544 | struct used_address *used_address, | |
2545 | unsigned int allowed_msghdr_flags) | |
2546 | { | |
2547 | struct sockaddr_storage address; | |
2548 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2549 | ssize_t err; | |
2550 | ||
2551 | msg_sys->msg_name = &address; | |
2552 | ||
2553 | err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov); | |
2554 | if (err < 0) | |
2555 | return err; | |
2556 | ||
2557 | err = ____sys_sendmsg(sock, msg_sys, flags, used_address, | |
2558 | allowed_msghdr_flags); | |
da184284 | 2559 | kfree(iov); |
228e548e AB |
2560 | return err; |
2561 | } | |
2562 | ||
2563 | /* | |
2564 | * BSD sendmsg interface | |
2565 | */ | |
03b1230c | 2566 | long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg, |
0fa03c62 JA |
2567 | unsigned int flags) |
2568 | { | |
03b1230c | 2569 | return ____sys_sendmsg(sock, msg, flags, NULL, 0); |
0fa03c62 | 2570 | } |
228e548e | 2571 | |
e1834a32 DB |
2572 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2573 | bool forbid_cmsg_compat) | |
228e548e AB |
2574 | { |
2575 | int fput_needed, err; | |
2576 | struct msghdr msg_sys; | |
1be374a0 AL |
2577 | struct socket *sock; |
2578 | ||
e1834a32 DB |
2579 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2580 | return -EINVAL; | |
2581 | ||
1be374a0 | 2582 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
228e548e AB |
2583 | if (!sock) |
2584 | goto out; | |
2585 | ||
28a94d8f | 2586 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); |
228e548e | 2587 | |
6cb153ca | 2588 | fput_light(sock->file, fput_needed); |
89bddce5 | 2589 | out: |
1da177e4 LT |
2590 | return err; |
2591 | } | |
2592 | ||
666547ff | 2593 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) |
a7526eb5 | 2594 | { |
e1834a32 | 2595 | return __sys_sendmsg(fd, msg, flags, true); |
a7526eb5 AL |
2596 | } |
2597 | ||
228e548e AB |
2598 | /* |
2599 | * Linux sendmmsg interface | |
2600 | */ | |
2601 | ||
2602 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, | |
e1834a32 | 2603 | unsigned int flags, bool forbid_cmsg_compat) |
228e548e AB |
2604 | { |
2605 | int fput_needed, err, datagrams; | |
2606 | struct socket *sock; | |
2607 | struct mmsghdr __user *entry; | |
2608 | struct compat_mmsghdr __user *compat_entry; | |
2609 | struct msghdr msg_sys; | |
c71d8ebe | 2610 | struct used_address used_address; |
f092276d | 2611 | unsigned int oflags = flags; |
228e548e | 2612 | |
e1834a32 DB |
2613 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2614 | return -EINVAL; | |
2615 | ||
98382f41 AB |
2616 | if (vlen > UIO_MAXIOV) |
2617 | vlen = UIO_MAXIOV; | |
228e548e AB |
2618 | |
2619 | datagrams = 0; | |
2620 | ||
2621 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2622 | if (!sock) | |
2623 | return err; | |
2624 | ||
c71d8ebe | 2625 | used_address.name_len = UINT_MAX; |
228e548e AB |
2626 | entry = mmsg; |
2627 | compat_entry = (struct compat_mmsghdr __user *)mmsg; | |
728ffb86 | 2628 | err = 0; |
f092276d | 2629 | flags |= MSG_BATCH; |
228e548e AB |
2630 | |
2631 | while (datagrams < vlen) { | |
f092276d TH |
2632 | if (datagrams == vlen - 1) |
2633 | flags = oflags; | |
2634 | ||
228e548e | 2635 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2636 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, |
28a94d8f | 2637 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2638 | if (err < 0) |
2639 | break; | |
2640 | err = __put_user(err, &compat_entry->msg_len); | |
2641 | ++compat_entry; | |
2642 | } else { | |
a7526eb5 | 2643 | err = ___sys_sendmsg(sock, |
666547ff | 2644 | (struct user_msghdr __user *)entry, |
28a94d8f | 2645 | &msg_sys, flags, &used_address, MSG_EOR); |
228e548e AB |
2646 | if (err < 0) |
2647 | break; | |
2648 | err = put_user(err, &entry->msg_len); | |
2649 | ++entry; | |
2650 | } | |
2651 | ||
2652 | if (err) | |
2653 | break; | |
2654 | ++datagrams; | |
3023898b SHY |
2655 | if (msg_data_left(&msg_sys)) |
2656 | break; | |
a78cb84c | 2657 | cond_resched(); |
228e548e AB |
2658 | } |
2659 | ||
228e548e AB |
2660 | fput_light(sock->file, fput_needed); |
2661 | ||
728ffb86 AB |
2662 | /* We only return an error if no datagrams were able to be sent */ |
2663 | if (datagrams != 0) | |
228e548e AB |
2664 | return datagrams; |
2665 | ||
228e548e AB |
2666 | return err; |
2667 | } | |
2668 | ||
2669 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, | |
2670 | unsigned int, vlen, unsigned int, flags) | |
2671 | { | |
e1834a32 | 2672 | return __sys_sendmmsg(fd, mmsg, vlen, flags, true); |
228e548e AB |
2673 | } |
2674 | ||
03b1230c JA |
2675 | int recvmsg_copy_msghdr(struct msghdr *msg, |
2676 | struct user_msghdr __user *umsg, unsigned flags, | |
2677 | struct sockaddr __user **uaddr, | |
2678 | struct iovec **iov) | |
1da177e4 | 2679 | { |
08adb7da | 2680 | ssize_t err; |
1da177e4 | 2681 | |
4257c8ca JA |
2682 | if (MSG_CMSG_COMPAT & flags) { |
2683 | struct compat_msghdr __user *msg_compat; | |
1da177e4 | 2684 | |
4257c8ca JA |
2685 | msg_compat = (struct compat_msghdr __user *) umsg; |
2686 | err = get_compat_msghdr(msg, msg_compat, uaddr, iov); | |
2687 | } else { | |
2688 | err = copy_msghdr_from_user(msg, umsg, uaddr, iov); | |
2689 | } | |
1da177e4 | 2690 | if (err < 0) |
da184284 | 2691 | return err; |
1da177e4 | 2692 | |
4257c8ca JA |
2693 | return 0; |
2694 | } | |
2695 | ||
2696 | static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys, | |
2697 | struct user_msghdr __user *msg, | |
2698 | struct sockaddr __user *uaddr, | |
2699 | unsigned int flags, int nosec) | |
2700 | { | |
2701 | struct compat_msghdr __user *msg_compat = | |
2702 | (struct compat_msghdr __user *) msg; | |
2703 | int __user *uaddr_len = COMPAT_NAMELEN(msg); | |
2704 | struct sockaddr_storage addr; | |
2705 | unsigned long cmsg_ptr; | |
2706 | int len; | |
2707 | ssize_t err; | |
2708 | ||
2709 | msg_sys->msg_name = &addr; | |
a2e27255 ACM |
2710 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
2711 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
89bddce5 | 2712 | |
f3d33426 HFS |
2713 | /* We assume all kernel code knows the size of sockaddr_storage */ |
2714 | msg_sys->msg_namelen = 0; | |
2715 | ||
1da177e4 LT |
2716 | if (sock->file->f_flags & O_NONBLOCK) |
2717 | flags |= MSG_DONTWAIT; | |
1af66221 ED |
2718 | |
2719 | if (unlikely(nosec)) | |
2720 | err = sock_recvmsg_nosec(sock, msg_sys, flags); | |
2721 | else | |
2722 | err = sock_recvmsg(sock, msg_sys, flags); | |
2723 | ||
1da177e4 | 2724 | if (err < 0) |
4257c8ca | 2725 | goto out; |
1da177e4 LT |
2726 | len = err; |
2727 | ||
2728 | if (uaddr != NULL) { | |
43db362d | 2729 | err = move_addr_to_user(&addr, |
a2e27255 | 2730 | msg_sys->msg_namelen, uaddr, |
89bddce5 | 2731 | uaddr_len); |
1da177e4 | 2732 | if (err < 0) |
4257c8ca | 2733 | goto out; |
1da177e4 | 2734 | } |
a2e27255 | 2735 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
37f7f421 | 2736 | COMPAT_FLAGS(msg)); |
1da177e4 | 2737 | if (err) |
4257c8ca | 2738 | goto out; |
1da177e4 | 2739 | if (MSG_CMSG_COMPAT & flags) |
a2e27255 | 2740 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2741 | &msg_compat->msg_controllen); |
2742 | else | |
a2e27255 | 2743 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
1da177e4 LT |
2744 | &msg->msg_controllen); |
2745 | if (err) | |
4257c8ca | 2746 | goto out; |
1da177e4 | 2747 | err = len; |
4257c8ca JA |
2748 | out: |
2749 | return err; | |
2750 | } | |
2751 | ||
2752 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, | |
2753 | struct msghdr *msg_sys, unsigned int flags, int nosec) | |
2754 | { | |
2755 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
2756 | /* user mode address pointers */ | |
2757 | struct sockaddr __user *uaddr; | |
2758 | ssize_t err; | |
2759 | ||
2760 | err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov); | |
2761 | if (err < 0) | |
2762 | return err; | |
1da177e4 | 2763 | |
4257c8ca | 2764 | err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec); |
da184284 | 2765 | kfree(iov); |
a2e27255 ACM |
2766 | return err; |
2767 | } | |
2768 | ||
2769 | /* | |
2770 | * BSD recvmsg interface | |
2771 | */ | |
2772 | ||
03b1230c JA |
2773 | long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg, |
2774 | struct user_msghdr __user *umsg, | |
2775 | struct sockaddr __user *uaddr, unsigned int flags) | |
aa1fa28f | 2776 | { |
03b1230c | 2777 | return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0); |
aa1fa28f JA |
2778 | } |
2779 | ||
e1834a32 DB |
2780 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
2781 | bool forbid_cmsg_compat) | |
a2e27255 ACM |
2782 | { |
2783 | int fput_needed, err; | |
2784 | struct msghdr msg_sys; | |
1be374a0 AL |
2785 | struct socket *sock; |
2786 | ||
e1834a32 DB |
2787 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
2788 | return -EINVAL; | |
2789 | ||
1be374a0 | 2790 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
a2e27255 ACM |
2791 | if (!sock) |
2792 | goto out; | |
2793 | ||
a7526eb5 | 2794 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
a2e27255 | 2795 | |
6cb153ca | 2796 | fput_light(sock->file, fput_needed); |
1da177e4 LT |
2797 | out: |
2798 | return err; | |
2799 | } | |
2800 | ||
666547ff | 2801 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, |
a7526eb5 AL |
2802 | unsigned int, flags) |
2803 | { | |
e1834a32 | 2804 | return __sys_recvmsg(fd, msg, flags, true); |
a7526eb5 AL |
2805 | } |
2806 | ||
a2e27255 ACM |
2807 | /* |
2808 | * Linux recvmmsg interface | |
2809 | */ | |
2810 | ||
e11d4284 AB |
2811 | static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2812 | unsigned int vlen, unsigned int flags, | |
2813 | struct timespec64 *timeout) | |
a2e27255 ACM |
2814 | { |
2815 | int fput_needed, err, datagrams; | |
2816 | struct socket *sock; | |
2817 | struct mmsghdr __user *entry; | |
d7256d0e | 2818 | struct compat_mmsghdr __user *compat_entry; |
a2e27255 | 2819 | struct msghdr msg_sys; |
766b9f92 DD |
2820 | struct timespec64 end_time; |
2821 | struct timespec64 timeout64; | |
a2e27255 ACM |
2822 | |
2823 | if (timeout && | |
2824 | poll_select_set_timeout(&end_time, timeout->tv_sec, | |
2825 | timeout->tv_nsec)) | |
2826 | return -EINVAL; | |
2827 | ||
2828 | datagrams = 0; | |
2829 | ||
2830 | sock = sockfd_lookup_light(fd, &err, &fput_needed); | |
2831 | if (!sock) | |
2832 | return err; | |
2833 | ||
7797dc41 SHY |
2834 | if (likely(!(flags & MSG_ERRQUEUE))) { |
2835 | err = sock_error(sock->sk); | |
2836 | if (err) { | |
2837 | datagrams = err; | |
2838 | goto out_put; | |
2839 | } | |
e623a9e9 | 2840 | } |
a2e27255 ACM |
2841 | |
2842 | entry = mmsg; | |
d7256d0e | 2843 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
a2e27255 ACM |
2844 | |
2845 | while (datagrams < vlen) { | |
2846 | /* | |
2847 | * No need to ask LSM for more than the first datagram. | |
2848 | */ | |
d7256d0e | 2849 | if (MSG_CMSG_COMPAT & flags) { |
666547ff | 2850 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, |
a7526eb5 AL |
2851 | &msg_sys, flags & ~MSG_WAITFORONE, |
2852 | datagrams); | |
d7256d0e JMG |
2853 | if (err < 0) |
2854 | break; | |
2855 | err = __put_user(err, &compat_entry->msg_len); | |
2856 | ++compat_entry; | |
2857 | } else { | |
a7526eb5 | 2858 | err = ___sys_recvmsg(sock, |
666547ff | 2859 | (struct user_msghdr __user *)entry, |
a7526eb5 AL |
2860 | &msg_sys, flags & ~MSG_WAITFORONE, |
2861 | datagrams); | |
d7256d0e JMG |
2862 | if (err < 0) |
2863 | break; | |
2864 | err = put_user(err, &entry->msg_len); | |
2865 | ++entry; | |
2866 | } | |
2867 | ||
a2e27255 ACM |
2868 | if (err) |
2869 | break; | |
a2e27255 ACM |
2870 | ++datagrams; |
2871 | ||
71c5c159 BB |
2872 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
2873 | if (flags & MSG_WAITFORONE) | |
2874 | flags |= MSG_DONTWAIT; | |
2875 | ||
a2e27255 | 2876 | if (timeout) { |
766b9f92 | 2877 | ktime_get_ts64(&timeout64); |
c2e6c856 | 2878 | *timeout = timespec64_sub(end_time, timeout64); |
a2e27255 ACM |
2879 | if (timeout->tv_sec < 0) { |
2880 | timeout->tv_sec = timeout->tv_nsec = 0; | |
2881 | break; | |
2882 | } | |
2883 | ||
2884 | /* Timeout, return less than vlen datagrams */ | |
2885 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) | |
2886 | break; | |
2887 | } | |
2888 | ||
2889 | /* Out of band data, return right away */ | |
2890 | if (msg_sys.msg_flags & MSG_OOB) | |
2891 | break; | |
a78cb84c | 2892 | cond_resched(); |
a2e27255 ACM |
2893 | } |
2894 | ||
a2e27255 | 2895 | if (err == 0) |
34b88a68 ACM |
2896 | goto out_put; |
2897 | ||
2898 | if (datagrams == 0) { | |
2899 | datagrams = err; | |
2900 | goto out_put; | |
2901 | } | |
a2e27255 | 2902 | |
34b88a68 ACM |
2903 | /* |
2904 | * We may return less entries than requested (vlen) if the | |
2905 | * sock is non block and there aren't enough datagrams... | |
2906 | */ | |
2907 | if (err != -EAGAIN) { | |
a2e27255 | 2908 | /* |
34b88a68 ACM |
2909 | * ... or if recvmsg returns an error after we |
2910 | * received some datagrams, where we record the | |
2911 | * error to return on the next call or if the | |
2912 | * app asks about it using getsockopt(SO_ERROR). | |
a2e27255 | 2913 | */ |
34b88a68 | 2914 | sock->sk->sk_err = -err; |
a2e27255 | 2915 | } |
34b88a68 ACM |
2916 | out_put: |
2917 | fput_light(sock->file, fput_needed); | |
a2e27255 | 2918 | |
34b88a68 | 2919 | return datagrams; |
a2e27255 ACM |
2920 | } |
2921 | ||
e11d4284 AB |
2922 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
2923 | unsigned int vlen, unsigned int flags, | |
2924 | struct __kernel_timespec __user *timeout, | |
2925 | struct old_timespec32 __user *timeout32) | |
a2e27255 ACM |
2926 | { |
2927 | int datagrams; | |
c2e6c856 | 2928 | struct timespec64 timeout_sys; |
a2e27255 | 2929 | |
e11d4284 AB |
2930 | if (timeout && get_timespec64(&timeout_sys, timeout)) |
2931 | return -EFAULT; | |
a2e27255 | 2932 | |
e11d4284 | 2933 | if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) |
a2e27255 ACM |
2934 | return -EFAULT; |
2935 | ||
e11d4284 AB |
2936 | if (!timeout && !timeout32) |
2937 | return do_recvmmsg(fd, mmsg, vlen, flags, NULL); | |
2938 | ||
2939 | datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); | |
a2e27255 | 2940 | |
e11d4284 AB |
2941 | if (datagrams <= 0) |
2942 | return datagrams; | |
2943 | ||
2944 | if (timeout && put_timespec64(&timeout_sys, timeout)) | |
2945 | datagrams = -EFAULT; | |
2946 | ||
2947 | if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) | |
a2e27255 ACM |
2948 | datagrams = -EFAULT; |
2949 | ||
2950 | return datagrams; | |
2951 | } | |
2952 | ||
1255e269 DB |
2953 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
2954 | unsigned int, vlen, unsigned int, flags, | |
c2e6c856 | 2955 | struct __kernel_timespec __user *, timeout) |
1255e269 | 2956 | { |
e11d4284 AB |
2957 | if (flags & MSG_CMSG_COMPAT) |
2958 | return -EINVAL; | |
2959 | ||
2960 | return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); | |
2961 | } | |
2962 | ||
2963 | #ifdef CONFIG_COMPAT_32BIT_TIME | |
2964 | SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, | |
2965 | unsigned int, vlen, unsigned int, flags, | |
2966 | struct old_timespec32 __user *, timeout) | |
2967 | { | |
2968 | if (flags & MSG_CMSG_COMPAT) | |
2969 | return -EINVAL; | |
2970 | ||
2971 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); | |
1255e269 | 2972 | } |
e11d4284 | 2973 | #endif |
1255e269 | 2974 | |
a2e27255 | 2975 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
1da177e4 LT |
2976 | /* Argument list sizes for sys_socketcall */ |
2977 | #define AL(x) ((x) * sizeof(unsigned long)) | |
228e548e | 2978 | static const unsigned char nargs[21] = { |
c6d409cf ED |
2979 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
2980 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), | |
2981 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), | |
228e548e | 2982 | AL(4), AL(5), AL(4) |
89bddce5 SH |
2983 | }; |
2984 | ||
1da177e4 LT |
2985 | #undef AL |
2986 | ||
2987 | /* | |
89bddce5 | 2988 | * System call vectors. |
1da177e4 LT |
2989 | * |
2990 | * Argument checking cleaned up. Saved 20% in size. | |
2991 | * This function doesn't need to set the kernel lock because | |
89bddce5 | 2992 | * it is set by the callees. |
1da177e4 LT |
2993 | */ |
2994 | ||
3e0fa65f | 2995 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
1da177e4 | 2996 | { |
2950fa9d | 2997 | unsigned long a[AUDITSC_ARGS]; |
89bddce5 | 2998 | unsigned long a0, a1; |
1da177e4 | 2999 | int err; |
47379052 | 3000 | unsigned int len; |
1da177e4 | 3001 | |
228e548e | 3002 | if (call < 1 || call > SYS_SENDMMSG) |
1da177e4 | 3003 | return -EINVAL; |
c8e8cd57 | 3004 | call = array_index_nospec(call, SYS_SENDMMSG + 1); |
1da177e4 | 3005 | |
47379052 AV |
3006 | len = nargs[call]; |
3007 | if (len > sizeof(a)) | |
3008 | return -EINVAL; | |
3009 | ||
1da177e4 | 3010 | /* copy_from_user should be SMP safe. */ |
47379052 | 3011 | if (copy_from_user(a, args, len)) |
1da177e4 | 3012 | return -EFAULT; |
3ec3b2fb | 3013 | |
2950fa9d CG |
3014 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
3015 | if (err) | |
3016 | return err; | |
3ec3b2fb | 3017 | |
89bddce5 SH |
3018 | a0 = a[0]; |
3019 | a1 = a[1]; | |
3020 | ||
3021 | switch (call) { | |
3022 | case SYS_SOCKET: | |
9d6a15c3 | 3023 | err = __sys_socket(a0, a1, a[2]); |
89bddce5 SH |
3024 | break; |
3025 | case SYS_BIND: | |
a87d35d8 | 3026 | err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
3027 | break; |
3028 | case SYS_CONNECT: | |
1387c2c2 | 3029 | err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
89bddce5 SH |
3030 | break; |
3031 | case SYS_LISTEN: | |
25e290ee | 3032 | err = __sys_listen(a0, a1); |
89bddce5 SH |
3033 | break; |
3034 | case SYS_ACCEPT: | |
4541e805 DB |
3035 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
3036 | (int __user *)a[2], 0); | |
89bddce5 SH |
3037 | break; |
3038 | case SYS_GETSOCKNAME: | |
3039 | err = | |
8882a107 DB |
3040 | __sys_getsockname(a0, (struct sockaddr __user *)a1, |
3041 | (int __user *)a[2]); | |
89bddce5 SH |
3042 | break; |
3043 | case SYS_GETPEERNAME: | |
3044 | err = | |
b21c8f83 DB |
3045 | __sys_getpeername(a0, (struct sockaddr __user *)a1, |
3046 | (int __user *)a[2]); | |
89bddce5 SH |
3047 | break; |
3048 | case SYS_SOCKETPAIR: | |
6debc8d8 | 3049 | err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
89bddce5 SH |
3050 | break; |
3051 | case SYS_SEND: | |
f3bf896b DB |
3052 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
3053 | NULL, 0); | |
89bddce5 SH |
3054 | break; |
3055 | case SYS_SENDTO: | |
211b634b DB |
3056 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
3057 | (struct sockaddr __user *)a[4], a[5]); | |
89bddce5 SH |
3058 | break; |
3059 | case SYS_RECV: | |
d27e9afc DB |
3060 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
3061 | NULL, NULL); | |
89bddce5 SH |
3062 | break; |
3063 | case SYS_RECVFROM: | |
7a09e1eb DB |
3064 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
3065 | (struct sockaddr __user *)a[4], | |
3066 | (int __user *)a[5]); | |
89bddce5 SH |
3067 | break; |
3068 | case SYS_SHUTDOWN: | |
005a1aea | 3069 | err = __sys_shutdown(a0, a1); |
89bddce5 SH |
3070 | break; |
3071 | case SYS_SETSOCKOPT: | |
cc36dca0 DB |
3072 | err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], |
3073 | a[4]); | |
89bddce5 SH |
3074 | break; |
3075 | case SYS_GETSOCKOPT: | |
3076 | err = | |
13a2d70e DB |
3077 | __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
3078 | (int __user *)a[4]); | |
89bddce5 SH |
3079 | break; |
3080 | case SYS_SENDMSG: | |
e1834a32 DB |
3081 | err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, |
3082 | a[2], true); | |
89bddce5 | 3083 | break; |
228e548e | 3084 | case SYS_SENDMMSG: |
e1834a32 DB |
3085 | err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], |
3086 | a[3], true); | |
228e548e | 3087 | break; |
89bddce5 | 3088 | case SYS_RECVMSG: |
e1834a32 DB |
3089 | err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, |
3090 | a[2], true); | |
89bddce5 | 3091 | break; |
a2e27255 | 3092 | case SYS_RECVMMSG: |
3ca47e95 | 3093 | if (IS_ENABLED(CONFIG_64BIT)) |
e11d4284 AB |
3094 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, |
3095 | a[2], a[3], | |
3096 | (struct __kernel_timespec __user *)a[4], | |
3097 | NULL); | |
3098 | else | |
3099 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, | |
3100 | a[2], a[3], NULL, | |
3101 | (struct old_timespec32 __user *)a[4]); | |
a2e27255 | 3102 | break; |
de11defe | 3103 | case SYS_ACCEPT4: |
4541e805 DB |
3104 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
3105 | (int __user *)a[2], a[3]); | |
aaca0bdc | 3106 | break; |
89bddce5 SH |
3107 | default: |
3108 | err = -EINVAL; | |
3109 | break; | |
1da177e4 LT |
3110 | } |
3111 | return err; | |
3112 | } | |
3113 | ||
89bddce5 | 3114 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
1da177e4 | 3115 | |
55737fda SH |
3116 | /** |
3117 | * sock_register - add a socket protocol handler | |
3118 | * @ops: description of protocol | |
3119 | * | |
1da177e4 LT |
3120 | * This function is called by a protocol handler that wants to |
3121 | * advertise its address family, and have it linked into the | |
e793c0f7 | 3122 | * socket interface. The value ops->family corresponds to the |
55737fda | 3123 | * socket system call protocol family. |
1da177e4 | 3124 | */ |
f0fd27d4 | 3125 | int sock_register(const struct net_proto_family *ops) |
1da177e4 LT |
3126 | { |
3127 | int err; | |
3128 | ||
3129 | if (ops->family >= NPROTO) { | |
3410f22e | 3130 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
1da177e4 LT |
3131 | return -ENOBUFS; |
3132 | } | |
55737fda SH |
3133 | |
3134 | spin_lock(&net_family_lock); | |
190683a9 ED |
3135 | if (rcu_dereference_protected(net_families[ops->family], |
3136 | lockdep_is_held(&net_family_lock))) | |
55737fda SH |
3137 | err = -EEXIST; |
3138 | else { | |
cf778b00 | 3139 | rcu_assign_pointer(net_families[ops->family], ops); |
1da177e4 LT |
3140 | err = 0; |
3141 | } | |
55737fda SH |
3142 | spin_unlock(&net_family_lock); |
3143 | ||
fe0bdbde | 3144 | pr_info("NET: Registered %s protocol family\n", pf_family_names[ops->family]); |
1da177e4 LT |
3145 | return err; |
3146 | } | |
c6d409cf | 3147 | EXPORT_SYMBOL(sock_register); |
1da177e4 | 3148 | |
55737fda SH |
3149 | /** |
3150 | * sock_unregister - remove a protocol handler | |
3151 | * @family: protocol family to remove | |
3152 | * | |
1da177e4 LT |
3153 | * This function is called by a protocol handler that wants to |
3154 | * remove its address family, and have it unlinked from the | |
55737fda SH |
3155 | * new socket creation. |
3156 | * | |
3157 | * If protocol handler is a module, then it can use module reference | |
3158 | * counts to protect against new references. If protocol handler is not | |
3159 | * a module then it needs to provide its own protection in | |
3160 | * the ops->create routine. | |
1da177e4 | 3161 | */ |
f0fd27d4 | 3162 | void sock_unregister(int family) |
1da177e4 | 3163 | { |
f0fd27d4 | 3164 | BUG_ON(family < 0 || family >= NPROTO); |
1da177e4 | 3165 | |
55737fda | 3166 | spin_lock(&net_family_lock); |
a9b3cd7f | 3167 | RCU_INIT_POINTER(net_families[family], NULL); |
55737fda SH |
3168 | spin_unlock(&net_family_lock); |
3169 | ||
3170 | synchronize_rcu(); | |
3171 | ||
fe0bdbde | 3172 | pr_info("NET: Unregistered %s protocol family\n", pf_family_names[family]); |
1da177e4 | 3173 | } |
c6d409cf | 3174 | EXPORT_SYMBOL(sock_unregister); |
1da177e4 | 3175 | |
bf2ae2e4 XL |
3176 | bool sock_is_registered(int family) |
3177 | { | |
66b51b0a | 3178 | return family < NPROTO && rcu_access_pointer(net_families[family]); |
bf2ae2e4 XL |
3179 | } |
3180 | ||
77d76ea3 | 3181 | static int __init sock_init(void) |
1da177e4 | 3182 | { |
b3e19d92 | 3183 | int err; |
2ca794e5 EB |
3184 | /* |
3185 | * Initialize the network sysctl infrastructure. | |
3186 | */ | |
3187 | err = net_sysctl_init(); | |
3188 | if (err) | |
3189 | goto out; | |
b3e19d92 | 3190 | |
1da177e4 | 3191 | /* |
89bddce5 | 3192 | * Initialize skbuff SLAB cache |
1da177e4 LT |
3193 | */ |
3194 | skb_init(); | |
1da177e4 LT |
3195 | |
3196 | /* | |
89bddce5 | 3197 | * Initialize the protocols module. |
1da177e4 LT |
3198 | */ |
3199 | ||
3200 | init_inodecache(); | |
b3e19d92 NP |
3201 | |
3202 | err = register_filesystem(&sock_fs_type); | |
3203 | if (err) | |
47260ba9 | 3204 | goto out; |
1da177e4 | 3205 | sock_mnt = kern_mount(&sock_fs_type); |
b3e19d92 NP |
3206 | if (IS_ERR(sock_mnt)) { |
3207 | err = PTR_ERR(sock_mnt); | |
3208 | goto out_mount; | |
3209 | } | |
77d76ea3 AK |
3210 | |
3211 | /* The real protocol initialization is performed in later initcalls. | |
1da177e4 LT |
3212 | */ |
3213 | ||
3214 | #ifdef CONFIG_NETFILTER | |
6d11cfdb PNA |
3215 | err = netfilter_init(); |
3216 | if (err) | |
3217 | goto out; | |
1da177e4 | 3218 | #endif |
cbeb321a | 3219 | |
408eccce | 3220 | ptp_classifier_init(); |
c1f19b51 | 3221 | |
b3e19d92 NP |
3222 | out: |
3223 | return err; | |
3224 | ||
3225 | out_mount: | |
3226 | unregister_filesystem(&sock_fs_type); | |
b3e19d92 | 3227 | goto out; |
1da177e4 LT |
3228 | } |
3229 | ||
77d76ea3 AK |
3230 | core_initcall(sock_init); /* early initcall */ |
3231 | ||
1da177e4 LT |
3232 | #ifdef CONFIG_PROC_FS |
3233 | void socket_seq_show(struct seq_file *seq) | |
3234 | { | |
648845ab TZ |
3235 | seq_printf(seq, "sockets: used %d\n", |
3236 | sock_inuse_get(seq->private)); | |
1da177e4 | 3237 | } |
89bddce5 | 3238 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 3239 | |
29c49648 AB |
3240 | /* Handle the fact that while struct ifreq has the same *layout* on |
3241 | * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, | |
3242 | * which are handled elsewhere, it still has different *size* due to | |
3243 | * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, | |
3244 | * resulting in struct ifreq being 32 and 40 bytes respectively). | |
3245 | * As a result, if the struct happens to be at the end of a page and | |
3246 | * the next page isn't readable/writable, we get a fault. To prevent | |
3247 | * that, copy back and forth to the full size. | |
3248 | */ | |
3249 | int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg) | |
7a229387 | 3250 | { |
29c49648 AB |
3251 | if (in_compat_syscall()) { |
3252 | struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr; | |
7a229387 | 3253 | |
29c49648 AB |
3254 | memset(ifr, 0, sizeof(*ifr)); |
3255 | if (copy_from_user(ifr32, arg, sizeof(*ifr32))) | |
3256 | return -EFAULT; | |
7a229387 | 3257 | |
29c49648 AB |
3258 | if (ifrdata) |
3259 | *ifrdata = compat_ptr(ifr32->ifr_data); | |
7a229387 | 3260 | |
29c49648 AB |
3261 | return 0; |
3262 | } | |
7a229387 | 3263 | |
29c49648 | 3264 | if (copy_from_user(ifr, arg, sizeof(*ifr))) |
7a229387 AB |
3265 | return -EFAULT; |
3266 | ||
29c49648 AB |
3267 | if (ifrdata) |
3268 | *ifrdata = ifr->ifr_data; | |
3269 | ||
7a229387 AB |
3270 | return 0; |
3271 | } | |
29c49648 | 3272 | EXPORT_SYMBOL(get_user_ifreq); |
7a229387 | 3273 | |
29c49648 | 3274 | int put_user_ifreq(struct ifreq *ifr, void __user *arg) |
7a229387 | 3275 | { |
29c49648 | 3276 | size_t size = sizeof(*ifr); |
7a229387 | 3277 | |
29c49648 AB |
3278 | if (in_compat_syscall()) |
3279 | size = sizeof(struct compat_ifreq); | |
7a229387 | 3280 | |
29c49648 | 3281 | if (copy_to_user(arg, ifr, size)) |
7a229387 AB |
3282 | return -EFAULT; |
3283 | ||
3a7da39d | 3284 | return 0; |
7a229387 | 3285 | } |
29c49648 | 3286 | EXPORT_SYMBOL(put_user_ifreq); |
7a229387 | 3287 | |
89bbfc95 | 3288 | #ifdef CONFIG_COMPAT |
7a50a240 AB |
3289 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
3290 | { | |
7a50a240 | 3291 | compat_uptr_t uptr32; |
44c02a2c AV |
3292 | struct ifreq ifr; |
3293 | void __user *saved; | |
3294 | int err; | |
7a50a240 | 3295 | |
29c49648 | 3296 | if (get_user_ifreq(&ifr, NULL, uifr32)) |
7a50a240 AB |
3297 | return -EFAULT; |
3298 | ||
3299 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) | |
3300 | return -EFAULT; | |
3301 | ||
44c02a2c AV |
3302 | saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; |
3303 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); | |
7a229387 | 3304 | |
a554bf96 | 3305 | err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL, NULL); |
44c02a2c AV |
3306 | if (!err) { |
3307 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; | |
29c49648 | 3308 | if (put_user_ifreq(&ifr, uifr32)) |
44c02a2c | 3309 | err = -EFAULT; |
ccbd6a5a | 3310 | } |
44c02a2c | 3311 | return err; |
7a229387 AB |
3312 | } |
3313 | ||
590d4693 BH |
3314 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ |
3315 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, | |
6b96018b | 3316 | struct compat_ifreq __user *u_ifreq32) |
7a229387 | 3317 | { |
44c02a2c | 3318 | struct ifreq ifreq; |
a554bf96 | 3319 | void __user *data; |
7a229387 | 3320 | |
d0efb162 PC |
3321 | if (!is_socket_ioctl_cmd(cmd)) |
3322 | return -ENOTTY; | |
a554bf96 | 3323 | if (get_user_ifreq(&ifreq, &data, u_ifreq32)) |
7a229387 | 3324 | return -EFAULT; |
a554bf96 | 3325 | ifreq.ifr_data = data; |
7a229387 | 3326 | |
a554bf96 | 3327 | return dev_ioctl(net, cmd, &ifreq, data, NULL); |
a2116ed2 AB |
3328 | } |
3329 | ||
6b96018b AB |
3330 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
3331 | unsigned int cmd, unsigned long arg) | |
3332 | { | |
3333 | void __user *argp = compat_ptr(arg); | |
3334 | struct sock *sk = sock->sk; | |
3335 | struct net *net = sock_net(sk); | |
7a229387 | 3336 | |
6b96018b | 3337 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
88fc023f | 3338 | return sock_ioctl(file, cmd, (unsigned long)argp); |
6b96018b AB |
3339 | |
3340 | switch (cmd) { | |
7a50a240 AB |
3341 | case SIOCWANDEV: |
3342 | return compat_siocwandev(net, argp); | |
0768e170 AB |
3343 | case SIOCGSTAMP_OLD: |
3344 | case SIOCGSTAMPNS_OLD: | |
c7cbdbf2 AB |
3345 | if (!sock->ops->gettstamp) |
3346 | return -ENOIOCTLCMD; | |
0768e170 | 3347 | return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, |
c7cbdbf2 AB |
3348 | !COMPAT_USE_64BIT_TIME); |
3349 | ||
dd98d289 | 3350 | case SIOCETHTOOL: |
590d4693 BH |
3351 | case SIOCBONDSLAVEINFOQUERY: |
3352 | case SIOCBONDINFOQUERY: | |
a2116ed2 | 3353 | case SIOCSHWTSTAMP: |
fd468c74 | 3354 | case SIOCGHWTSTAMP: |
590d4693 | 3355 | return compat_ifr_data_ioctl(net, cmd, argp); |
6b96018b AB |
3356 | |
3357 | case FIOSETOWN: | |
3358 | case SIOCSPGRP: | |
3359 | case FIOGETOWN: | |
3360 | case SIOCGPGRP: | |
3361 | case SIOCBRADDBR: | |
3362 | case SIOCBRDELBR: | |
3363 | case SIOCGIFVLAN: | |
3364 | case SIOCSIFVLAN: | |
c62cce2c | 3365 | case SIOCGSKNS: |
0768e170 AB |
3366 | case SIOCGSTAMP_NEW: |
3367 | case SIOCGSTAMPNS_NEW: | |
876f0bf9 | 3368 | case SIOCGIFCONF: |
fd3a4590 RP |
3369 | case SIOCSIFBR: |
3370 | case SIOCGIFBR: | |
6b96018b AB |
3371 | return sock_ioctl(file, cmd, arg); |
3372 | ||
3373 | case SIOCGIFFLAGS: | |
3374 | case SIOCSIFFLAGS: | |
709566d7 AB |
3375 | case SIOCGIFMAP: |
3376 | case SIOCSIFMAP: | |
6b96018b AB |
3377 | case SIOCGIFMETRIC: |
3378 | case SIOCSIFMETRIC: | |
3379 | case SIOCGIFMTU: | |
3380 | case SIOCSIFMTU: | |
3381 | case SIOCGIFMEM: | |
3382 | case SIOCSIFMEM: | |
3383 | case SIOCGIFHWADDR: | |
3384 | case SIOCSIFHWADDR: | |
3385 | case SIOCADDMULTI: | |
3386 | case SIOCDELMULTI: | |
3387 | case SIOCGIFINDEX: | |
6b96018b AB |
3388 | case SIOCGIFADDR: |
3389 | case SIOCSIFADDR: | |
3390 | case SIOCSIFHWBROADCAST: | |
6b96018b | 3391 | case SIOCDIFADDR: |
6b96018b AB |
3392 | case SIOCGIFBRDADDR: |
3393 | case SIOCSIFBRDADDR: | |
3394 | case SIOCGIFDSTADDR: | |
3395 | case SIOCSIFDSTADDR: | |
3396 | case SIOCGIFNETMASK: | |
3397 | case SIOCSIFNETMASK: | |
3398 | case SIOCSIFPFLAGS: | |
3399 | case SIOCGIFPFLAGS: | |
3400 | case SIOCGIFTXQLEN: | |
3401 | case SIOCSIFTXQLEN: | |
3402 | case SIOCBRADDIF: | |
3403 | case SIOCBRDELIF: | |
c6c9fee3 | 3404 | case SIOCGIFNAME: |
9177efd3 AB |
3405 | case SIOCSIFNAME: |
3406 | case SIOCGMIIPHY: | |
3407 | case SIOCGMIIREG: | |
3408 | case SIOCSMIIREG: | |
f92d4fc9 AV |
3409 | case SIOCBONDENSLAVE: |
3410 | case SIOCBONDRELEASE: | |
3411 | case SIOCBONDSETHWADDR: | |
3412 | case SIOCBONDCHANGEACTIVE: | |
6b96018b AB |
3413 | case SIOCSARP: |
3414 | case SIOCGARP: | |
3415 | case SIOCDARP: | |
c7dc504e | 3416 | case SIOCOUTQ: |
9d7bf41f | 3417 | case SIOCOUTQNSD: |
6b96018b | 3418 | case SIOCATMARK: |
63ff03ab | 3419 | return sock_do_ioctl(net, sock, cmd, arg); |
9177efd3 AB |
3420 | } |
3421 | ||
6b96018b AB |
3422 | return -ENOIOCTLCMD; |
3423 | } | |
7a229387 | 3424 | |
95c96174 | 3425 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, |
89bddce5 | 3426 | unsigned long arg) |
89bbfc95 SP |
3427 | { |
3428 | struct socket *sock = file->private_data; | |
3429 | int ret = -ENOIOCTLCMD; | |
87de87d5 DM |
3430 | struct sock *sk; |
3431 | struct net *net; | |
3432 | ||
3433 | sk = sock->sk; | |
3434 | net = sock_net(sk); | |
89bbfc95 SP |
3435 | |
3436 | if (sock->ops->compat_ioctl) | |
3437 | ret = sock->ops->compat_ioctl(sock, cmd, arg); | |
3438 | ||
87de87d5 DM |
3439 | if (ret == -ENOIOCTLCMD && |
3440 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) | |
3441 | ret = compat_wext_handle_ioctl(net, cmd, arg); | |
3442 | ||
6b96018b AB |
3443 | if (ret == -ENOIOCTLCMD) |
3444 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); | |
3445 | ||
89bbfc95 SP |
3446 | return ret; |
3447 | } | |
3448 | #endif | |
3449 | ||
8a3c245c PT |
3450 | /** |
3451 | * kernel_bind - bind an address to a socket (kernel space) | |
3452 | * @sock: socket | |
3453 | * @addr: address | |
3454 | * @addrlen: length of address | |
3455 | * | |
3456 | * Returns 0 or an error. | |
3457 | */ | |
3458 | ||
ac5a488e SS |
3459 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
3460 | { | |
3461 | return sock->ops->bind(sock, addr, addrlen); | |
3462 | } | |
c6d409cf | 3463 | EXPORT_SYMBOL(kernel_bind); |
ac5a488e | 3464 | |
8a3c245c PT |
3465 | /** |
3466 | * kernel_listen - move socket to listening state (kernel space) | |
3467 | * @sock: socket | |
3468 | * @backlog: pending connections queue size | |
3469 | * | |
3470 | * Returns 0 or an error. | |
3471 | */ | |
3472 | ||
ac5a488e SS |
3473 | int kernel_listen(struct socket *sock, int backlog) |
3474 | { | |
3475 | return sock->ops->listen(sock, backlog); | |
3476 | } | |
c6d409cf | 3477 | EXPORT_SYMBOL(kernel_listen); |
ac5a488e | 3478 | |
8a3c245c PT |
3479 | /** |
3480 | * kernel_accept - accept a connection (kernel space) | |
3481 | * @sock: listening socket | |
3482 | * @newsock: new connected socket | |
3483 | * @flags: flags | |
3484 | * | |
3485 | * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. | |
3486 | * If it fails, @newsock is guaranteed to be %NULL. | |
3487 | * Returns 0 or an error. | |
3488 | */ | |
3489 | ||
ac5a488e SS |
3490 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
3491 | { | |
3492 | struct sock *sk = sock->sk; | |
3493 | int err; | |
3494 | ||
3495 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
3496 | newsock); | |
3497 | if (err < 0) | |
3498 | goto done; | |
3499 | ||
cdfbabfb | 3500 | err = sock->ops->accept(sock, *newsock, flags, true); |
ac5a488e SS |
3501 | if (err < 0) { |
3502 | sock_release(*newsock); | |
fa8705b0 | 3503 | *newsock = NULL; |
ac5a488e SS |
3504 | goto done; |
3505 | } | |
3506 | ||
3507 | (*newsock)->ops = sock->ops; | |
1b08534e | 3508 | __module_get((*newsock)->ops->owner); |
ac5a488e SS |
3509 | |
3510 | done: | |
3511 | return err; | |
3512 | } | |
c6d409cf | 3513 | EXPORT_SYMBOL(kernel_accept); |
ac5a488e | 3514 | |
8a3c245c PT |
3515 | /** |
3516 | * kernel_connect - connect a socket (kernel space) | |
3517 | * @sock: socket | |
3518 | * @addr: address | |
3519 | * @addrlen: address length | |
3520 | * @flags: flags (O_NONBLOCK, ...) | |
3521 | * | |
f1dcffcc | 3522 | * For datagram sockets, @addr is the address to which datagrams are sent |
8a3c245c PT |
3523 | * by default, and the only address from which datagrams are received. |
3524 | * For stream sockets, attempts to connect to @addr. | |
3525 | * Returns 0 or an error code. | |
3526 | */ | |
3527 | ||
ac5a488e | 3528 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
4768fbcb | 3529 | int flags) |
ac5a488e SS |
3530 | { |
3531 | return sock->ops->connect(sock, addr, addrlen, flags); | |
3532 | } | |
c6d409cf | 3533 | EXPORT_SYMBOL(kernel_connect); |
ac5a488e | 3534 | |
8a3c245c PT |
3535 | /** |
3536 | * kernel_getsockname - get the address which the socket is bound (kernel space) | |
3537 | * @sock: socket | |
3538 | * @addr: address holder | |
3539 | * | |
3540 | * Fills the @addr pointer with the address which the socket is bound. | |
0fc95dec | 3541 | * Returns the length of the address in bytes or an error code. |
8a3c245c PT |
3542 | */ |
3543 | ||
9b2c45d4 | 3544 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3545 | { |
9b2c45d4 | 3546 | return sock->ops->getname(sock, addr, 0); |
ac5a488e | 3547 | } |
c6d409cf | 3548 | EXPORT_SYMBOL(kernel_getsockname); |
ac5a488e | 3549 | |
8a3c245c | 3550 | /** |
645f0897 | 3551 | * kernel_getpeername - get the address which the socket is connected (kernel space) |
8a3c245c PT |
3552 | * @sock: socket |
3553 | * @addr: address holder | |
3554 | * | |
3555 | * Fills the @addr pointer with the address which the socket is connected. | |
0fc95dec | 3556 | * Returns the length of the address in bytes or an error code. |
8a3c245c PT |
3557 | */ |
3558 | ||
9b2c45d4 | 3559 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr) |
ac5a488e | 3560 | { |
9b2c45d4 | 3561 | return sock->ops->getname(sock, addr, 1); |
ac5a488e | 3562 | } |
c6d409cf | 3563 | EXPORT_SYMBOL(kernel_getpeername); |
ac5a488e | 3564 | |
8a3c245c PT |
3565 | /** |
3566 | * kernel_sendpage - send a &page through a socket (kernel space) | |
3567 | * @sock: socket | |
3568 | * @page: page | |
3569 | * @offset: page offset | |
3570 | * @size: total size in bytes | |
3571 | * @flags: flags (MSG_DONTWAIT, ...) | |
3572 | * | |
3573 | * Returns the total amount sent in bytes or an error. | |
3574 | */ | |
3575 | ||
ac5a488e SS |
3576 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
3577 | size_t size, int flags) | |
3578 | { | |
7b62d31d CL |
3579 | if (sock->ops->sendpage) { |
3580 | /* Warn in case the improper page to zero-copy send */ | |
3581 | WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send"); | |
ac5a488e | 3582 | return sock->ops->sendpage(sock, page, offset, size, flags); |
7b62d31d | 3583 | } |
ac5a488e SS |
3584 | return sock_no_sendpage(sock, page, offset, size, flags); |
3585 | } | |
c6d409cf | 3586 | EXPORT_SYMBOL(kernel_sendpage); |
ac5a488e | 3587 | |
8a3c245c PT |
3588 | /** |
3589 | * kernel_sendpage_locked - send a &page through the locked sock (kernel space) | |
3590 | * @sk: sock | |
3591 | * @page: page | |
3592 | * @offset: page offset | |
3593 | * @size: total size in bytes | |
3594 | * @flags: flags (MSG_DONTWAIT, ...) | |
3595 | * | |
3596 | * Returns the total amount sent in bytes or an error. | |
3597 | * Caller must hold @sk. | |
3598 | */ | |
3599 | ||
306b13eb TH |
3600 | int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, |
3601 | size_t size, int flags) | |
3602 | { | |
3603 | struct socket *sock = sk->sk_socket; | |
3604 | ||
3605 | if (sock->ops->sendpage_locked) | |
3606 | return sock->ops->sendpage_locked(sk, page, offset, size, | |
3607 | flags); | |
3608 | ||
3609 | return sock_no_sendpage_locked(sk, page, offset, size, flags); | |
3610 | } | |
3611 | EXPORT_SYMBOL(kernel_sendpage_locked); | |
3612 | ||
8a3c245c | 3613 | /** |
645f0897 | 3614 | * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space) |
8a3c245c PT |
3615 | * @sock: socket |
3616 | * @how: connection part | |
3617 | * | |
3618 | * Returns 0 or an error. | |
3619 | */ | |
3620 | ||
91cf45f0 TM |
3621 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
3622 | { | |
3623 | return sock->ops->shutdown(sock, how); | |
3624 | } | |
91cf45f0 | 3625 | EXPORT_SYMBOL(kernel_sock_shutdown); |
113c3075 | 3626 | |
8a3c245c PT |
3627 | /** |
3628 | * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket | |
3629 | * @sk: socket | |
3630 | * | |
3631 | * This routine returns the IP overhead imposed by a socket i.e. | |
3632 | * the length of the underlying IP header, depending on whether | |
3633 | * this is an IPv4 or IPv6 socket and the length from IP options turned | |
3634 | * on at the socket. Assumes that the caller has a lock on the socket. | |
113c3075 | 3635 | */ |
8a3c245c | 3636 | |
113c3075 P |
3637 | u32 kernel_sock_ip_overhead(struct sock *sk) |
3638 | { | |
3639 | struct inet_sock *inet; | |
3640 | struct ip_options_rcu *opt; | |
3641 | u32 overhead = 0; | |
113c3075 P |
3642 | #if IS_ENABLED(CONFIG_IPV6) |
3643 | struct ipv6_pinfo *np; | |
3644 | struct ipv6_txoptions *optv6 = NULL; | |
3645 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3646 | ||
3647 | if (!sk) | |
3648 | return overhead; | |
3649 | ||
113c3075 P |
3650 | switch (sk->sk_family) { |
3651 | case AF_INET: | |
3652 | inet = inet_sk(sk); | |
3653 | overhead += sizeof(struct iphdr); | |
3654 | opt = rcu_dereference_protected(inet->inet_opt, | |
614d79c0 | 3655 | sock_owned_by_user(sk)); |
113c3075 P |
3656 | if (opt) |
3657 | overhead += opt->opt.optlen; | |
3658 | return overhead; | |
3659 | #if IS_ENABLED(CONFIG_IPV6) | |
3660 | case AF_INET6: | |
3661 | np = inet6_sk(sk); | |
3662 | overhead += sizeof(struct ipv6hdr); | |
3663 | if (np) | |
3664 | optv6 = rcu_dereference_protected(np->opt, | |
614d79c0 | 3665 | sock_owned_by_user(sk)); |
113c3075 P |
3666 | if (optv6) |
3667 | overhead += (optv6->opt_flen + optv6->opt_nflen); | |
3668 | return overhead; | |
3669 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
3670 | default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ | |
3671 | return overhead; | |
3672 | } | |
3673 | } | |
3674 | EXPORT_SYMBOL(kernel_sock_ip_overhead); |