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1/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
7 * Ross Biro
8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
45 * Tigran Aivazian : Made listen(2) backlog sanity checks
46 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
56 * paradigm.
57 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
61#include <linux/mm.h>
62#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
66#include <linux/thread_info.h>
67#include <linux/rcupdate.h>
68#include <linux/netdevice.h>
69#include <linux/proc_fs.h>
70#include <linux/seq_file.h>
71#include <linux/mutex.h>
72#include <linux/if_bridge.h>
73#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
75#include <linux/ptp_classify.h>
76#include <linux/init.h>
77#include <linux/poll.h>
78#include <linux/cache.h>
79#include <linux/module.h>
80#include <linux/highmem.h>
81#include <linux/mount.h>
82#include <linux/security.h>
83#include <linux/syscalls.h>
84#include <linux/compat.h>
85#include <linux/kmod.h>
86#include <linux/audit.h>
87#include <linux/wireless.h>
88#include <linux/nsproxy.h>
89#include <linux/magic.h>
90#include <linux/slab.h>
91#include <linux/xattr.h>
92
93#include <linux/uaccess.h>
94#include <asm/unistd.h>
95
96#include <net/compat.h>
97#include <net/wext.h>
98#include <net/cls_cgroup.h>
99
100#include <net/sock.h>
101#include <linux/netfilter.h>
102
103#include <linux/if_tun.h>
104#include <linux/ipv6_route.h>
105#include <linux/route.h>
106#include <linux/sockios.h>
107#include <linux/atalk.h>
108#include <net/busy_poll.h>
109#include <linux/errqueue.h>
110
111#ifdef CONFIG_NET_RX_BUSY_POLL
112unsigned int sysctl_net_busy_read __read_mostly;
113unsigned int sysctl_net_busy_poll __read_mostly;
114#endif
115
116static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
117static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
118static int sock_mmap(struct file *file, struct vm_area_struct *vma);
119
120static int sock_close(struct inode *inode, struct file *file);
121static unsigned int sock_poll(struct file *file,
122 struct poll_table_struct *wait);
123static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
124#ifdef CONFIG_COMPAT
125static long compat_sock_ioctl(struct file *file,
126 unsigned int cmd, unsigned long arg);
127#endif
128static int sock_fasync(int fd, struct file *filp, int on);
129static ssize_t sock_sendpage(struct file *file, struct page *page,
130 int offset, size_t size, loff_t *ppos, int more);
131static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
132 struct pipe_inode_info *pipe, size_t len,
133 unsigned int flags);
134
135/*
136 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
137 * in the operation structures but are done directly via the socketcall() multiplexor.
138 */
139
140static const struct file_operations socket_file_ops = {
141 .owner = THIS_MODULE,
142 .llseek = no_llseek,
143 .read_iter = sock_read_iter,
144 .write_iter = sock_write_iter,
145 .poll = sock_poll,
146 .unlocked_ioctl = sock_ioctl,
147#ifdef CONFIG_COMPAT
148 .compat_ioctl = compat_sock_ioctl,
149#endif
150 .mmap = sock_mmap,
151 .release = sock_close,
152 .fasync = sock_fasync,
153 .sendpage = sock_sendpage,
154 .splice_write = generic_splice_sendpage,
155 .splice_read = sock_splice_read,
156};
157
158/*
159 * The protocol list. Each protocol is registered in here.
160 */
161
162static DEFINE_SPINLOCK(net_family_lock);
163static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
164
165/*
166 * Statistics counters of the socket lists
167 */
168
169static DEFINE_PER_CPU(int, sockets_in_use);
170
171/*
172 * Support routines.
173 * Move socket addresses back and forth across the kernel/user
174 * divide and look after the messy bits.
175 */
176
177/**
178 * move_addr_to_kernel - copy a socket address into kernel space
179 * @uaddr: Address in user space
180 * @kaddr: Address in kernel space
181 * @ulen: Length in user space
182 *
183 * The address is copied into kernel space. If the provided address is
184 * too long an error code of -EINVAL is returned. If the copy gives
185 * invalid addresses -EFAULT is returned. On a success 0 is returned.
186 */
187
188int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
189{
190 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
191 return -EINVAL;
192 if (ulen == 0)
193 return 0;
194 if (copy_from_user(kaddr, uaddr, ulen))
195 return -EFAULT;
196 return audit_sockaddr(ulen, kaddr);
197}
198
199/**
200 * move_addr_to_user - copy an address to user space
201 * @kaddr: kernel space address
202 * @klen: length of address in kernel
203 * @uaddr: user space address
204 * @ulen: pointer to user length field
205 *
206 * The value pointed to by ulen on entry is the buffer length available.
207 * This is overwritten with the buffer space used. -EINVAL is returned
208 * if an overlong buffer is specified or a negative buffer size. -EFAULT
209 * is returned if either the buffer or the length field are not
210 * accessible.
211 * After copying the data up to the limit the user specifies, the true
212 * length of the data is written over the length limit the user
213 * specified. Zero is returned for a success.
214 */
215
216static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
217 void __user *uaddr, int __user *ulen)
218{
219 int err;
220 int len;
221
222 BUG_ON(klen > sizeof(struct sockaddr_storage));
223 err = get_user(len, ulen);
224 if (err)
225 return err;
226 if (len > klen)
227 len = klen;
228 if (len < 0)
229 return -EINVAL;
230 if (len) {
231 if (audit_sockaddr(klen, kaddr))
232 return -ENOMEM;
233 if (copy_to_user(uaddr, kaddr, len))
234 return -EFAULT;
235 }
236 /*
237 * "fromlen shall refer to the value before truncation.."
238 * 1003.1g
239 */
240 return __put_user(klen, ulen);
241}
242
243static struct kmem_cache *sock_inode_cachep __read_mostly;
244
245static struct inode *sock_alloc_inode(struct super_block *sb)
246{
247 struct socket_alloc *ei;
248 struct socket_wq *wq;
249
250 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
251 if (!ei)
252 return NULL;
253 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
254 if (!wq) {
255 kmem_cache_free(sock_inode_cachep, ei);
256 return NULL;
257 }
258 init_waitqueue_head(&wq->wait);
259 wq->fasync_list = NULL;
260 wq->flags = 0;
261 RCU_INIT_POINTER(ei->socket.wq, wq);
262
263 ei->socket.state = SS_UNCONNECTED;
264 ei->socket.flags = 0;
265 ei->socket.ops = NULL;
266 ei->socket.sk = NULL;
267 ei->socket.file = NULL;
268
269 return &ei->vfs_inode;
270}
271
272static void sock_destroy_inode(struct inode *inode)
273{
274 struct socket_alloc *ei;
275 struct socket_wq *wq;
276
277 ei = container_of(inode, struct socket_alloc, vfs_inode);
278 wq = rcu_dereference_protected(ei->socket.wq, 1);
279 kfree_rcu(wq, rcu);
280 kmem_cache_free(sock_inode_cachep, ei);
281}
282
283static void init_once(void *foo)
284{
285 struct socket_alloc *ei = (struct socket_alloc *)foo;
286
287 inode_init_once(&ei->vfs_inode);
288}
289
290static int init_inodecache(void)
291{
292 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
293 sizeof(struct socket_alloc),
294 0,
295 (SLAB_HWCACHE_ALIGN |
296 SLAB_RECLAIM_ACCOUNT |
297 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
298 init_once);
299 if (sock_inode_cachep == NULL)
300 return -ENOMEM;
301 return 0;
302}
303
304static const struct super_operations sockfs_ops = {
305 .alloc_inode = sock_alloc_inode,
306 .destroy_inode = sock_destroy_inode,
307 .statfs = simple_statfs,
308};
309
310/*
311 * sockfs_dname() is called from d_path().
312 */
313static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
314{
315 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
316 d_inode(dentry)->i_ino);
317}
318
319static const struct dentry_operations sockfs_dentry_operations = {
320 .d_dname = sockfs_dname,
321};
322
323static int sockfs_xattr_get(const struct xattr_handler *handler,
324 struct dentry *dentry, struct inode *inode,
325 const char *suffix, void *value, size_t size)
326{
327 if (value) {
328 if (dentry->d_name.len + 1 > size)
329 return -ERANGE;
330 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
331 }
332 return dentry->d_name.len + 1;
333}
334
335#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
336#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
337#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
338
339static const struct xattr_handler sockfs_xattr_handler = {
340 .name = XATTR_NAME_SOCKPROTONAME,
341 .get = sockfs_xattr_get,
342};
343
344static int sockfs_security_xattr_set(const struct xattr_handler *handler,
345 struct dentry *dentry, struct inode *inode,
346 const char *suffix, const void *value,
347 size_t size, int flags)
348{
349 /* Handled by LSM. */
350 return -EAGAIN;
351}
352
353static const struct xattr_handler sockfs_security_xattr_handler = {
354 .prefix = XATTR_SECURITY_PREFIX,
355 .set = sockfs_security_xattr_set,
356};
357
358static const struct xattr_handler *sockfs_xattr_handlers[] = {
359 &sockfs_xattr_handler,
360 &sockfs_security_xattr_handler,
361 NULL
362};
363
364static struct dentry *sockfs_mount(struct file_system_type *fs_type,
365 int flags, const char *dev_name, void *data)
366{
367 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
368 sockfs_xattr_handlers,
369 &sockfs_dentry_operations, SOCKFS_MAGIC);
370}
371
372static struct vfsmount *sock_mnt __read_mostly;
373
374static struct file_system_type sock_fs_type = {
375 .name = "sockfs",
376 .mount = sockfs_mount,
377 .kill_sb = kill_anon_super,
378};
379
380/*
381 * Obtains the first available file descriptor and sets it up for use.
382 *
383 * These functions create file structures and maps them to fd space
384 * of the current process. On success it returns file descriptor
385 * and file struct implicitly stored in sock->file.
386 * Note that another thread may close file descriptor before we return
387 * from this function. We use the fact that now we do not refer
388 * to socket after mapping. If one day we will need it, this
389 * function will increment ref. count on file by 1.
390 *
391 * In any case returned fd MAY BE not valid!
392 * This race condition is unavoidable
393 * with shared fd spaces, we cannot solve it inside kernel,
394 * but we take care of internal coherence yet.
395 */
396
397struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
398{
399 struct qstr name = { .name = "" };
400 struct path path;
401 struct file *file;
402
403 if (dname) {
404 name.name = dname;
405 name.len = strlen(name.name);
406 } else if (sock->sk) {
407 name.name = sock->sk->sk_prot_creator->name;
408 name.len = strlen(name.name);
409 }
410 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
411 if (unlikely(!path.dentry))
412 return ERR_PTR(-ENOMEM);
413 path.mnt = mntget(sock_mnt);
414
415 d_instantiate(path.dentry, SOCK_INODE(sock));
416
417 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
418 &socket_file_ops);
419 if (IS_ERR(file)) {
420 /* drop dentry, keep inode */
421 ihold(d_inode(path.dentry));
422 path_put(&path);
423 return file;
424 }
425
426 sock->file = file;
427 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
428 file->private_data = sock;
429 return file;
430}
431EXPORT_SYMBOL(sock_alloc_file);
432
433static int sock_map_fd(struct socket *sock, int flags)
434{
435 struct file *newfile;
436 int fd = get_unused_fd_flags(flags);
437 if (unlikely(fd < 0))
438 return fd;
439
440 newfile = sock_alloc_file(sock, flags, NULL);
441 if (likely(!IS_ERR(newfile))) {
442 fd_install(fd, newfile);
443 return fd;
444 }
445
446 put_unused_fd(fd);
447 return PTR_ERR(newfile);
448}
449
450struct socket *sock_from_file(struct file *file, int *err)
451{
452 if (file->f_op == &socket_file_ops)
453 return file->private_data; /* set in sock_map_fd */
454
455 *err = -ENOTSOCK;
456 return NULL;
457}
458EXPORT_SYMBOL(sock_from_file);
459
460/**
461 * sockfd_lookup - Go from a file number to its socket slot
462 * @fd: file handle
463 * @err: pointer to an error code return
464 *
465 * The file handle passed in is locked and the socket it is bound
466 * too is returned. If an error occurs the err pointer is overwritten
467 * with a negative errno code and NULL is returned. The function checks
468 * for both invalid handles and passing a handle which is not a socket.
469 *
470 * On a success the socket object pointer is returned.
471 */
472
473struct socket *sockfd_lookup(int fd, int *err)
474{
475 struct file *file;
476 struct socket *sock;
477
478 file = fget(fd);
479 if (!file) {
480 *err = -EBADF;
481 return NULL;
482 }
483
484 sock = sock_from_file(file, err);
485 if (!sock)
486 fput(file);
487 return sock;
488}
489EXPORT_SYMBOL(sockfd_lookup);
490
491static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
492{
493 struct fd f = fdget(fd);
494 struct socket *sock;
495
496 *err = -EBADF;
497 if (f.file) {
498 sock = sock_from_file(f.file, err);
499 if (likely(sock)) {
500 *fput_needed = f.flags;
501 return sock;
502 }
503 fdput(f);
504 }
505 return NULL;
506}
507
508static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
509 size_t size)
510{
511 ssize_t len;
512 ssize_t used = 0;
513
514 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
515 if (len < 0)
516 return len;
517 used += len;
518 if (buffer) {
519 if (size < used)
520 return -ERANGE;
521 buffer += len;
522 }
523
524 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
525 used += len;
526 if (buffer) {
527 if (size < used)
528 return -ERANGE;
529 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
530 buffer += len;
531 }
532
533 return used;
534}
535
536static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
537{
538 int err = simple_setattr(dentry, iattr);
539
540 if (!err && (iattr->ia_valid & ATTR_UID)) {
541 struct socket *sock = SOCKET_I(d_inode(dentry));
542
543 sock->sk->sk_uid = iattr->ia_uid;
544 }
545
546 return err;
547}
548
549static const struct inode_operations sockfs_inode_ops = {
550 .listxattr = sockfs_listxattr,
551 .setattr = sockfs_setattr,
552};
553
554/**
555 * sock_alloc - allocate a socket
556 *
557 * Allocate a new inode and socket object. The two are bound together
558 * and initialised. The socket is then returned. If we are out of inodes
559 * NULL is returned.
560 */
561
562struct socket *sock_alloc(void)
563{
564 struct inode *inode;
565 struct socket *sock;
566
567 inode = new_inode_pseudo(sock_mnt->mnt_sb);
568 if (!inode)
569 return NULL;
570
571 sock = SOCKET_I(inode);
572
573 kmemcheck_annotate_bitfield(sock, type);
574 inode->i_ino = get_next_ino();
575 inode->i_mode = S_IFSOCK | S_IRWXUGO;
576 inode->i_uid = current_fsuid();
577 inode->i_gid = current_fsgid();
578 inode->i_op = &sockfs_inode_ops;
579
580 this_cpu_add(sockets_in_use, 1);
581 return sock;
582}
583EXPORT_SYMBOL(sock_alloc);
584
585/**
586 * sock_release - close a socket
587 * @sock: socket to close
588 *
589 * The socket is released from the protocol stack if it has a release
590 * callback, and the inode is then released if the socket is bound to
591 * an inode not a file.
592 */
593
594void sock_release(struct socket *sock)
595{
596 if (sock->ops) {
597 struct module *owner = sock->ops->owner;
598
599 sock->ops->release(sock);
600 sock->ops = NULL;
601 module_put(owner);
602 }
603
604 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
605 pr_err("%s: fasync list not empty!\n", __func__);
606
607 this_cpu_sub(sockets_in_use, 1);
608 if (!sock->file) {
609 iput(SOCK_INODE(sock));
610 return;
611 }
612 sock->file = NULL;
613}
614EXPORT_SYMBOL(sock_release);
615
616void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
617{
618 u8 flags = *tx_flags;
619
620 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
621 flags |= SKBTX_HW_TSTAMP;
622
623 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
624 flags |= SKBTX_SW_TSTAMP;
625
626 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
627 flags |= SKBTX_SCHED_TSTAMP;
628
629 *tx_flags = flags;
630}
631EXPORT_SYMBOL(__sock_tx_timestamp);
632
633static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
634{
635 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
636 BUG_ON(ret == -EIOCBQUEUED);
637 return ret;
638}
639
640int sock_sendmsg(struct socket *sock, struct msghdr *msg)
641{
642 int err = security_socket_sendmsg(sock, msg,
643 msg_data_left(msg));
644
645 return err ?: sock_sendmsg_nosec(sock, msg);
646}
647EXPORT_SYMBOL(sock_sendmsg);
648
649int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
650 struct kvec *vec, size_t num, size_t size)
651{
652 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
653 return sock_sendmsg(sock, msg);
654}
655EXPORT_SYMBOL(kernel_sendmsg);
656
657/*
658 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
659 */
660void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
661 struct sk_buff *skb)
662{
663 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
664 struct scm_timestamping tss;
665 int empty = 1;
666 struct skb_shared_hwtstamps *shhwtstamps =
667 skb_hwtstamps(skb);
668
669 /* Race occurred between timestamp enabling and packet
670 receiving. Fill in the current time for now. */
671 if (need_software_tstamp && skb->tstamp == 0)
672 __net_timestamp(skb);
673
674 if (need_software_tstamp) {
675 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
676 struct timeval tv;
677 skb_get_timestamp(skb, &tv);
678 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
679 sizeof(tv), &tv);
680 } else {
681 struct timespec ts;
682 skb_get_timestampns(skb, &ts);
683 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
684 sizeof(ts), &ts);
685 }
686 }
687
688 memset(&tss, 0, sizeof(tss));
689 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
690 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
691 empty = 0;
692 if (shhwtstamps &&
693 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
694 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
695 empty = 0;
696 if (!empty) {
697 put_cmsg(msg, SOL_SOCKET,
698 SCM_TIMESTAMPING, sizeof(tss), &tss);
699
700 if (skb->len && (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS))
701 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
702 skb->len, skb->data);
703 }
704}
705EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
706
707void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
708 struct sk_buff *skb)
709{
710 int ack;
711
712 if (!sock_flag(sk, SOCK_WIFI_STATUS))
713 return;
714 if (!skb->wifi_acked_valid)
715 return;
716
717 ack = skb->wifi_acked;
718
719 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
720}
721EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
722
723static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
724 struct sk_buff *skb)
725{
726 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
727 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
728 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
729}
730
731void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
732 struct sk_buff *skb)
733{
734 sock_recv_timestamp(msg, sk, skb);
735 sock_recv_drops(msg, sk, skb);
736}
737EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
738
739static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
740 int flags)
741{
742 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
743}
744
745int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
746{
747 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
748
749 return err ?: sock_recvmsg_nosec(sock, msg, flags);
750}
751EXPORT_SYMBOL(sock_recvmsg);
752
753/**
754 * kernel_recvmsg - Receive a message from a socket (kernel space)
755 * @sock: The socket to receive the message from
756 * @msg: Received message
757 * @vec: Input s/g array for message data
758 * @num: Size of input s/g array
759 * @size: Number of bytes to read
760 * @flags: Message flags (MSG_DONTWAIT, etc...)
761 *
762 * On return the msg structure contains the scatter/gather array passed in the
763 * vec argument. The array is modified so that it consists of the unfilled
764 * portion of the original array.
765 *
766 * The returned value is the total number of bytes received, or an error.
767 */
768int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
769 struct kvec *vec, size_t num, size_t size, int flags)
770{
771 mm_segment_t oldfs = get_fs();
772 int result;
773
774 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
775 set_fs(KERNEL_DS);
776 result = sock_recvmsg(sock, msg, flags);
777 set_fs(oldfs);
778 return result;
779}
780EXPORT_SYMBOL(kernel_recvmsg);
781
782static ssize_t sock_sendpage(struct file *file, struct page *page,
783 int offset, size_t size, loff_t *ppos, int more)
784{
785 struct socket *sock;
786 int flags;
787
788 sock = file->private_data;
789
790 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
791 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
792 flags |= more;
793
794 return kernel_sendpage(sock, page, offset, size, flags);
795}
796
797static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
798 struct pipe_inode_info *pipe, size_t len,
799 unsigned int flags)
800{
801 struct socket *sock = file->private_data;
802
803 if (unlikely(!sock->ops->splice_read))
804 return -EINVAL;
805
806 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
807}
808
809static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
810{
811 struct file *file = iocb->ki_filp;
812 struct socket *sock = file->private_data;
813 struct msghdr msg = {.msg_iter = *to,
814 .msg_iocb = iocb};
815 ssize_t res;
816
817 if (file->f_flags & O_NONBLOCK)
818 msg.msg_flags = MSG_DONTWAIT;
819
820 if (iocb->ki_pos != 0)
821 return -ESPIPE;
822
823 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
824 return 0;
825
826 res = sock_recvmsg(sock, &msg, msg.msg_flags);
827 *to = msg.msg_iter;
828 return res;
829}
830
831static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
832{
833 struct file *file = iocb->ki_filp;
834 struct socket *sock = file->private_data;
835 struct msghdr msg = {.msg_iter = *from,
836 .msg_iocb = iocb};
837 ssize_t res;
838
839 if (iocb->ki_pos != 0)
840 return -ESPIPE;
841
842 if (file->f_flags & O_NONBLOCK)
843 msg.msg_flags = MSG_DONTWAIT;
844
845 if (sock->type == SOCK_SEQPACKET)
846 msg.msg_flags |= MSG_EOR;
847
848 res = sock_sendmsg(sock, &msg);
849 *from = msg.msg_iter;
850 return res;
851}
852
853/*
854 * Atomic setting of ioctl hooks to avoid race
855 * with module unload.
856 */
857
858static DEFINE_MUTEX(br_ioctl_mutex);
859static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
860
861void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
862{
863 mutex_lock(&br_ioctl_mutex);
864 br_ioctl_hook = hook;
865 mutex_unlock(&br_ioctl_mutex);
866}
867EXPORT_SYMBOL(brioctl_set);
868
869static DEFINE_MUTEX(vlan_ioctl_mutex);
870static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
871
872void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
873{
874 mutex_lock(&vlan_ioctl_mutex);
875 vlan_ioctl_hook = hook;
876 mutex_unlock(&vlan_ioctl_mutex);
877}
878EXPORT_SYMBOL(vlan_ioctl_set);
879
880static DEFINE_MUTEX(dlci_ioctl_mutex);
881static int (*dlci_ioctl_hook) (unsigned int, void __user *);
882
883void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
884{
885 mutex_lock(&dlci_ioctl_mutex);
886 dlci_ioctl_hook = hook;
887 mutex_unlock(&dlci_ioctl_mutex);
888}
889EXPORT_SYMBOL(dlci_ioctl_set);
890
891static long sock_do_ioctl(struct net *net, struct socket *sock,
892 unsigned int cmd, unsigned long arg)
893{
894 int err;
895 void __user *argp = (void __user *)arg;
896
897 err = sock->ops->ioctl(sock, cmd, arg);
898
899 /*
900 * If this ioctl is unknown try to hand it down
901 * to the NIC driver.
902 */
903 if (err == -ENOIOCTLCMD)
904 err = dev_ioctl(net, cmd, argp);
905
906 return err;
907}
908
909/*
910 * With an ioctl, arg may well be a user mode pointer, but we don't know
911 * what to do with it - that's up to the protocol still.
912 */
913
914static struct ns_common *get_net_ns(struct ns_common *ns)
915{
916 return &get_net(container_of(ns, struct net, ns))->ns;
917}
918
919static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
920{
921 struct socket *sock;
922 struct sock *sk;
923 void __user *argp = (void __user *)arg;
924 int pid, err;
925 struct net *net;
926
927 sock = file->private_data;
928 sk = sock->sk;
929 net = sock_net(sk);
930 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
931 err = dev_ioctl(net, cmd, argp);
932 } else
933#ifdef CONFIG_WEXT_CORE
934 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
935 err = dev_ioctl(net, cmd, argp);
936 } else
937#endif
938 switch (cmd) {
939 case FIOSETOWN:
940 case SIOCSPGRP:
941 err = -EFAULT;
942 if (get_user(pid, (int __user *)argp))
943 break;
944 f_setown(sock->file, pid, 1);
945 err = 0;
946 break;
947 case FIOGETOWN:
948 case SIOCGPGRP:
949 err = put_user(f_getown(sock->file),
950 (int __user *)argp);
951 break;
952 case SIOCGIFBR:
953 case SIOCSIFBR:
954 case SIOCBRADDBR:
955 case SIOCBRDELBR:
956 err = -ENOPKG;
957 if (!br_ioctl_hook)
958 request_module("bridge");
959
960 mutex_lock(&br_ioctl_mutex);
961 if (br_ioctl_hook)
962 err = br_ioctl_hook(net, cmd, argp);
963 mutex_unlock(&br_ioctl_mutex);
964 break;
965 case SIOCGIFVLAN:
966 case SIOCSIFVLAN:
967 err = -ENOPKG;
968 if (!vlan_ioctl_hook)
969 request_module("8021q");
970
971 mutex_lock(&vlan_ioctl_mutex);
972 if (vlan_ioctl_hook)
973 err = vlan_ioctl_hook(net, argp);
974 mutex_unlock(&vlan_ioctl_mutex);
975 break;
976 case SIOCADDDLCI:
977 case SIOCDELDLCI:
978 err = -ENOPKG;
979 if (!dlci_ioctl_hook)
980 request_module("dlci");
981
982 mutex_lock(&dlci_ioctl_mutex);
983 if (dlci_ioctl_hook)
984 err = dlci_ioctl_hook(cmd, argp);
985 mutex_unlock(&dlci_ioctl_mutex);
986 break;
987 case SIOCGSKNS:
988 err = -EPERM;
989 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
990 break;
991
992 err = open_related_ns(&net->ns, get_net_ns);
993 break;
994 default:
995 err = sock_do_ioctl(net, sock, cmd, arg);
996 break;
997 }
998 return err;
999}
1000
1001int sock_create_lite(int family, int type, int protocol, struct socket **res)
1002{
1003 int err;
1004 struct socket *sock = NULL;
1005
1006 err = security_socket_create(family, type, protocol, 1);
1007 if (err)
1008 goto out;
1009
1010 sock = sock_alloc();
1011 if (!sock) {
1012 err = -ENOMEM;
1013 goto out;
1014 }
1015
1016 sock->type = type;
1017 err = security_socket_post_create(sock, family, type, protocol, 1);
1018 if (err)
1019 goto out_release;
1020
1021out:
1022 *res = sock;
1023 return err;
1024out_release:
1025 sock_release(sock);
1026 sock = NULL;
1027 goto out;
1028}
1029EXPORT_SYMBOL(sock_create_lite);
1030
1031/* No kernel lock held - perfect */
1032static unsigned int sock_poll(struct file *file, poll_table *wait)
1033{
1034 unsigned int busy_flag = 0;
1035 struct socket *sock;
1036
1037 /*
1038 * We can't return errors to poll, so it's either yes or no.
1039 */
1040 sock = file->private_data;
1041
1042 if (sk_can_busy_loop(sock->sk)) {
1043 /* this socket can poll_ll so tell the system call */
1044 busy_flag = POLL_BUSY_LOOP;
1045
1046 /* once, only if requested by syscall */
1047 if (wait && (wait->_key & POLL_BUSY_LOOP))
1048 sk_busy_loop(sock->sk, 1);
1049 }
1050
1051 return busy_flag | sock->ops->poll(file, sock, wait);
1052}
1053
1054static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1055{
1056 struct socket *sock = file->private_data;
1057
1058 return sock->ops->mmap(file, sock, vma);
1059}
1060
1061static int sock_close(struct inode *inode, struct file *filp)
1062{
1063 sock_release(SOCKET_I(inode));
1064 return 0;
1065}
1066
1067/*
1068 * Update the socket async list
1069 *
1070 * Fasync_list locking strategy.
1071 *
1072 * 1. fasync_list is modified only under process context socket lock
1073 * i.e. under semaphore.
1074 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1075 * or under socket lock
1076 */
1077
1078static int sock_fasync(int fd, struct file *filp, int on)
1079{
1080 struct socket *sock = filp->private_data;
1081 struct sock *sk = sock->sk;
1082 struct socket_wq *wq;
1083
1084 if (sk == NULL)
1085 return -EINVAL;
1086
1087 lock_sock(sk);
1088 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
1089 fasync_helper(fd, filp, on, &wq->fasync_list);
1090
1091 if (!wq->fasync_list)
1092 sock_reset_flag(sk, SOCK_FASYNC);
1093 else
1094 sock_set_flag(sk, SOCK_FASYNC);
1095
1096 release_sock(sk);
1097 return 0;
1098}
1099
1100/* This function may be called only under rcu_lock */
1101
1102int sock_wake_async(struct socket_wq *wq, int how, int band)
1103{
1104 if (!wq || !wq->fasync_list)
1105 return -1;
1106
1107 switch (how) {
1108 case SOCK_WAKE_WAITD:
1109 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
1110 break;
1111 goto call_kill;
1112 case SOCK_WAKE_SPACE:
1113 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
1114 break;
1115 /* fall through */
1116 case SOCK_WAKE_IO:
1117call_kill:
1118 kill_fasync(&wq->fasync_list, SIGIO, band);
1119 break;
1120 case SOCK_WAKE_URG:
1121 kill_fasync(&wq->fasync_list, SIGURG, band);
1122 }
1123
1124 return 0;
1125}
1126EXPORT_SYMBOL(sock_wake_async);
1127
1128int __sock_create(struct net *net, int family, int type, int protocol,
1129 struct socket **res, int kern)
1130{
1131 int err;
1132 struct socket *sock;
1133 const struct net_proto_family *pf;
1134
1135 /*
1136 * Check protocol is in range
1137 */
1138 if (family < 0 || family >= NPROTO)
1139 return -EAFNOSUPPORT;
1140 if (type < 0 || type >= SOCK_MAX)
1141 return -EINVAL;
1142
1143 /* Compatibility.
1144
1145 This uglymoron is moved from INET layer to here to avoid
1146 deadlock in module load.
1147 */
1148 if (family == PF_INET && type == SOCK_PACKET) {
1149 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1150 current->comm);
1151 family = PF_PACKET;
1152 }
1153
1154 err = security_socket_create(family, type, protocol, kern);
1155 if (err)
1156 return err;
1157
1158 /*
1159 * Allocate the socket and allow the family to set things up. if
1160 * the protocol is 0, the family is instructed to select an appropriate
1161 * default.
1162 */
1163 sock = sock_alloc();
1164 if (!sock) {
1165 net_warn_ratelimited("socket: no more sockets\n");
1166 return -ENFILE; /* Not exactly a match, but its the
1167 closest posix thing */
1168 }
1169
1170 sock->type = type;
1171
1172#ifdef CONFIG_MODULES
1173 /* Attempt to load a protocol module if the find failed.
1174 *
1175 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1176 * requested real, full-featured networking support upon configuration.
1177 * Otherwise module support will break!
1178 */
1179 if (rcu_access_pointer(net_families[family]) == NULL)
1180 request_module("net-pf-%d", family);
1181#endif
1182
1183 rcu_read_lock();
1184 pf = rcu_dereference(net_families[family]);
1185 err = -EAFNOSUPPORT;
1186 if (!pf)
1187 goto out_release;
1188
1189 /*
1190 * We will call the ->create function, that possibly is in a loadable
1191 * module, so we have to bump that loadable module refcnt first.
1192 */
1193 if (!try_module_get(pf->owner))
1194 goto out_release;
1195
1196 /* Now protected by module ref count */
1197 rcu_read_unlock();
1198
1199 err = pf->create(net, sock, protocol, kern);
1200 if (err < 0)
1201 goto out_module_put;
1202
1203 /*
1204 * Now to bump the refcnt of the [loadable] module that owns this
1205 * socket at sock_release time we decrement its refcnt.
1206 */
1207 if (!try_module_get(sock->ops->owner))
1208 goto out_module_busy;
1209
1210 /*
1211 * Now that we're done with the ->create function, the [loadable]
1212 * module can have its refcnt decremented
1213 */
1214 module_put(pf->owner);
1215 err = security_socket_post_create(sock, family, type, protocol, kern);
1216 if (err)
1217 goto out_sock_release;
1218 *res = sock;
1219
1220 return 0;
1221
1222out_module_busy:
1223 err = -EAFNOSUPPORT;
1224out_module_put:
1225 sock->ops = NULL;
1226 module_put(pf->owner);
1227out_sock_release:
1228 sock_release(sock);
1229 return err;
1230
1231out_release:
1232 rcu_read_unlock();
1233 goto out_sock_release;
1234}
1235EXPORT_SYMBOL(__sock_create);
1236
1237int sock_create(int family, int type, int protocol, struct socket **res)
1238{
1239 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1240}
1241EXPORT_SYMBOL(sock_create);
1242
1243int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
1244{
1245 return __sock_create(net, family, type, protocol, res, 1);
1246}
1247EXPORT_SYMBOL(sock_create_kern);
1248
1249SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1250{
1251 int retval;
1252 struct socket *sock;
1253 int flags;
1254
1255 /* Check the SOCK_* constants for consistency. */
1256 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1257 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1258 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1259 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1260
1261 flags = type & ~SOCK_TYPE_MASK;
1262 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1263 return -EINVAL;
1264 type &= SOCK_TYPE_MASK;
1265
1266 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1267 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1268
1269 retval = sock_create(family, type, protocol, &sock);
1270 if (retval < 0)
1271 goto out;
1272
1273 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
1274 if (retval < 0)
1275 goto out_release;
1276
1277out:
1278 /* It may be already another descriptor 8) Not kernel problem. */
1279 return retval;
1280
1281out_release:
1282 sock_release(sock);
1283 return retval;
1284}
1285
1286/*
1287 * Create a pair of connected sockets.
1288 */
1289
1290SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1291 int __user *, usockvec)
1292{
1293 struct socket *sock1, *sock2;
1294 int fd1, fd2, err;
1295 struct file *newfile1, *newfile2;
1296 int flags;
1297
1298 flags = type & ~SOCK_TYPE_MASK;
1299 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1300 return -EINVAL;
1301 type &= SOCK_TYPE_MASK;
1302
1303 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1304 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1305
1306 /*
1307 * Obtain the first socket and check if the underlying protocol
1308 * supports the socketpair call.
1309 */
1310
1311 err = sock_create(family, type, protocol, &sock1);
1312 if (err < 0)
1313 goto out;
1314
1315 err = sock_create(family, type, protocol, &sock2);
1316 if (err < 0)
1317 goto out_release_1;
1318
1319 err = sock1->ops->socketpair(sock1, sock2);
1320 if (err < 0)
1321 goto out_release_both;
1322
1323 fd1 = get_unused_fd_flags(flags);
1324 if (unlikely(fd1 < 0)) {
1325 err = fd1;
1326 goto out_release_both;
1327 }
1328
1329 fd2 = get_unused_fd_flags(flags);
1330 if (unlikely(fd2 < 0)) {
1331 err = fd2;
1332 goto out_put_unused_1;
1333 }
1334
1335 newfile1 = sock_alloc_file(sock1, flags, NULL);
1336 if (IS_ERR(newfile1)) {
1337 err = PTR_ERR(newfile1);
1338 goto out_put_unused_both;
1339 }
1340
1341 newfile2 = sock_alloc_file(sock2, flags, NULL);
1342 if (IS_ERR(newfile2)) {
1343 err = PTR_ERR(newfile2);
1344 goto out_fput_1;
1345 }
1346
1347 err = put_user(fd1, &usockvec[0]);
1348 if (err)
1349 goto out_fput_both;
1350
1351 err = put_user(fd2, &usockvec[1]);
1352 if (err)
1353 goto out_fput_both;
1354
1355 audit_fd_pair(fd1, fd2);
1356
1357 fd_install(fd1, newfile1);
1358 fd_install(fd2, newfile2);
1359 /* fd1 and fd2 may be already another descriptors.
1360 * Not kernel problem.
1361 */
1362
1363 return 0;
1364
1365out_fput_both:
1366 fput(newfile2);
1367 fput(newfile1);
1368 put_unused_fd(fd2);
1369 put_unused_fd(fd1);
1370 goto out;
1371
1372out_fput_1:
1373 fput(newfile1);
1374 put_unused_fd(fd2);
1375 put_unused_fd(fd1);
1376 sock_release(sock2);
1377 goto out;
1378
1379out_put_unused_both:
1380 put_unused_fd(fd2);
1381out_put_unused_1:
1382 put_unused_fd(fd1);
1383out_release_both:
1384 sock_release(sock2);
1385out_release_1:
1386 sock_release(sock1);
1387out:
1388 return err;
1389}
1390
1391/*
1392 * Bind a name to a socket. Nothing much to do here since it's
1393 * the protocol's responsibility to handle the local address.
1394 *
1395 * We move the socket address to kernel space before we call
1396 * the protocol layer (having also checked the address is ok).
1397 */
1398
1399SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1400{
1401 struct socket *sock;
1402 struct sockaddr_storage address;
1403 int err, fput_needed;
1404
1405 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1406 if (sock) {
1407 err = move_addr_to_kernel(umyaddr, addrlen, &address);
1408 if (err >= 0) {
1409 err = security_socket_bind(sock,
1410 (struct sockaddr *)&address,
1411 addrlen);
1412 if (!err)
1413 err = sock->ops->bind(sock,
1414 (struct sockaddr *)
1415 &address, addrlen);
1416 }
1417 fput_light(sock->file, fput_needed);
1418 }
1419 return err;
1420}
1421
1422/*
1423 * Perform a listen. Basically, we allow the protocol to do anything
1424 * necessary for a listen, and if that works, we mark the socket as
1425 * ready for listening.
1426 */
1427
1428SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1429{
1430 struct socket *sock;
1431 int err, fput_needed;
1432 int somaxconn;
1433
1434 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1435 if (sock) {
1436 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1437 if ((unsigned int)backlog > somaxconn)
1438 backlog = somaxconn;
1439
1440 err = security_socket_listen(sock, backlog);
1441 if (!err)
1442 err = sock->ops->listen(sock, backlog);
1443
1444 fput_light(sock->file, fput_needed);
1445 }
1446 return err;
1447}
1448
1449/*
1450 * For accept, we attempt to create a new socket, set up the link
1451 * with the client, wake up the client, then return the new
1452 * connected fd. We collect the address of the connector in kernel
1453 * space and move it to user at the very end. This is unclean because
1454 * we open the socket then return an error.
1455 *
1456 * 1003.1g adds the ability to recvmsg() to query connection pending
1457 * status to recvmsg. We need to add that support in a way thats
1458 * clean when we restucture accept also.
1459 */
1460
1461SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1462 int __user *, upeer_addrlen, int, flags)
1463{
1464 struct socket *sock, *newsock;
1465 struct file *newfile;
1466 int err, len, newfd, fput_needed;
1467 struct sockaddr_storage address;
1468
1469 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1470 return -EINVAL;
1471
1472 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1473 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1474
1475 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1476 if (!sock)
1477 goto out;
1478
1479 err = -ENFILE;
1480 newsock = sock_alloc();
1481 if (!newsock)
1482 goto out_put;
1483
1484 newsock->type = sock->type;
1485 newsock->ops = sock->ops;
1486
1487 /*
1488 * We don't need try_module_get here, as the listening socket (sock)
1489 * has the protocol module (sock->ops->owner) held.
1490 */
1491 __module_get(newsock->ops->owner);
1492
1493 newfd = get_unused_fd_flags(flags);
1494 if (unlikely(newfd < 0)) {
1495 err = newfd;
1496 sock_release(newsock);
1497 goto out_put;
1498 }
1499 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1500 if (IS_ERR(newfile)) {
1501 err = PTR_ERR(newfile);
1502 put_unused_fd(newfd);
1503 sock_release(newsock);
1504 goto out_put;
1505 }
1506
1507 err = security_socket_accept(sock, newsock);
1508 if (err)
1509 goto out_fd;
1510
1511 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1512 if (err < 0)
1513 goto out_fd;
1514
1515 if (upeer_sockaddr) {
1516 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1517 &len, 2) < 0) {
1518 err = -ECONNABORTED;
1519 goto out_fd;
1520 }
1521 err = move_addr_to_user(&address,
1522 len, upeer_sockaddr, upeer_addrlen);
1523 if (err < 0)
1524 goto out_fd;
1525 }
1526
1527 /* File flags are not inherited via accept() unlike another OSes. */
1528
1529 fd_install(newfd, newfile);
1530 err = newfd;
1531
1532out_put:
1533 fput_light(sock->file, fput_needed);
1534out:
1535 return err;
1536out_fd:
1537 fput(newfile);
1538 put_unused_fd(newfd);
1539 goto out_put;
1540}
1541
1542SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1543 int __user *, upeer_addrlen)
1544{
1545 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1546}
1547
1548/*
1549 * Attempt to connect to a socket with the server address. The address
1550 * is in user space so we verify it is OK and move it to kernel space.
1551 *
1552 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1553 * break bindings
1554 *
1555 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1556 * other SEQPACKET protocols that take time to connect() as it doesn't
1557 * include the -EINPROGRESS status for such sockets.
1558 */
1559
1560SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1561 int, addrlen)
1562{
1563 struct socket *sock;
1564 struct sockaddr_storage address;
1565 int err, fput_needed;
1566
1567 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1568 if (!sock)
1569 goto out;
1570 err = move_addr_to_kernel(uservaddr, addrlen, &address);
1571 if (err < 0)
1572 goto out_put;
1573
1574 err =
1575 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1576 if (err)
1577 goto out_put;
1578
1579 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1580 sock->file->f_flags);
1581out_put:
1582 fput_light(sock->file, fput_needed);
1583out:
1584 return err;
1585}
1586
1587/*
1588 * Get the local address ('name') of a socket object. Move the obtained
1589 * name to user space.
1590 */
1591
1592SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1593 int __user *, usockaddr_len)
1594{
1595 struct socket *sock;
1596 struct sockaddr_storage address;
1597 int len, err, fput_needed;
1598
1599 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1600 if (!sock)
1601 goto out;
1602
1603 err = security_socket_getsockname(sock);
1604 if (err)
1605 goto out_put;
1606
1607 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1608 if (err)
1609 goto out_put;
1610 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
1611
1612out_put:
1613 fput_light(sock->file, fput_needed);
1614out:
1615 return err;
1616}
1617
1618/*
1619 * Get the remote address ('name') of a socket object. Move the obtained
1620 * name to user space.
1621 */
1622
1623SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1624 int __user *, usockaddr_len)
1625{
1626 struct socket *sock;
1627 struct sockaddr_storage address;
1628 int len, err, fput_needed;
1629
1630 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1631 if (sock != NULL) {
1632 err = security_socket_getpeername(sock);
1633 if (err) {
1634 fput_light(sock->file, fput_needed);
1635 return err;
1636 }
1637
1638 err =
1639 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1640 1);
1641 if (!err)
1642 err = move_addr_to_user(&address, len, usockaddr,
1643 usockaddr_len);
1644 fput_light(sock->file, fput_needed);
1645 }
1646 return err;
1647}
1648
1649/*
1650 * Send a datagram to a given address. We move the address into kernel
1651 * space and check the user space data area is readable before invoking
1652 * the protocol.
1653 */
1654
1655SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1656 unsigned int, flags, struct sockaddr __user *, addr,
1657 int, addr_len)
1658{
1659 struct socket *sock;
1660 struct sockaddr_storage address;
1661 int err;
1662 struct msghdr msg;
1663 struct iovec iov;
1664 int fput_needed;
1665
1666 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1667 if (unlikely(err))
1668 return err;
1669 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1670 if (!sock)
1671 goto out;
1672
1673 msg.msg_name = NULL;
1674 msg.msg_control = NULL;
1675 msg.msg_controllen = 0;
1676 msg.msg_namelen = 0;
1677 if (addr) {
1678 err = move_addr_to_kernel(addr, addr_len, &address);
1679 if (err < 0)
1680 goto out_put;
1681 msg.msg_name = (struct sockaddr *)&address;
1682 msg.msg_namelen = addr_len;
1683 }
1684 if (sock->file->f_flags & O_NONBLOCK)
1685 flags |= MSG_DONTWAIT;
1686 msg.msg_flags = flags;
1687 err = sock_sendmsg(sock, &msg);
1688
1689out_put:
1690 fput_light(sock->file, fput_needed);
1691out:
1692 return err;
1693}
1694
1695/*
1696 * Send a datagram down a socket.
1697 */
1698
1699SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1700 unsigned int, flags)
1701{
1702 return sys_sendto(fd, buff, len, flags, NULL, 0);
1703}
1704
1705/*
1706 * Receive a frame from the socket and optionally record the address of the
1707 * sender. We verify the buffers are writable and if needed move the
1708 * sender address from kernel to user space.
1709 */
1710
1711SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1712 unsigned int, flags, struct sockaddr __user *, addr,
1713 int __user *, addr_len)
1714{
1715 struct socket *sock;
1716 struct iovec iov;
1717 struct msghdr msg;
1718 struct sockaddr_storage address;
1719 int err, err2;
1720 int fput_needed;
1721
1722 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1723 if (unlikely(err))
1724 return err;
1725 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1726 if (!sock)
1727 goto out;
1728
1729 msg.msg_control = NULL;
1730 msg.msg_controllen = 0;
1731 /* Save some cycles and don't copy the address if not needed */
1732 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1733 /* We assume all kernel code knows the size of sockaddr_storage */
1734 msg.msg_namelen = 0;
1735 msg.msg_iocb = NULL;
1736 if (sock->file->f_flags & O_NONBLOCK)
1737 flags |= MSG_DONTWAIT;
1738 err = sock_recvmsg(sock, &msg, flags);
1739
1740 if (err >= 0 && addr != NULL) {
1741 err2 = move_addr_to_user(&address,
1742 msg.msg_namelen, addr, addr_len);
1743 if (err2 < 0)
1744 err = err2;
1745 }
1746
1747 fput_light(sock->file, fput_needed);
1748out:
1749 return err;
1750}
1751
1752/*
1753 * Receive a datagram from a socket.
1754 */
1755
1756SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1757 unsigned int, flags)
1758{
1759 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1760}
1761
1762/*
1763 * Set a socket option. Because we don't know the option lengths we have
1764 * to pass the user mode parameter for the protocols to sort out.
1765 */
1766
1767SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1768 char __user *, optval, int, optlen)
1769{
1770 int err, fput_needed;
1771 struct socket *sock;
1772
1773 if (optlen < 0)
1774 return -EINVAL;
1775
1776 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1777 if (sock != NULL) {
1778 err = security_socket_setsockopt(sock, level, optname);
1779 if (err)
1780 goto out_put;
1781
1782 if (level == SOL_SOCKET)
1783 err =
1784 sock_setsockopt(sock, level, optname, optval,
1785 optlen);
1786 else
1787 err =
1788 sock->ops->setsockopt(sock, level, optname, optval,
1789 optlen);
1790out_put:
1791 fput_light(sock->file, fput_needed);
1792 }
1793 return err;
1794}
1795
1796/*
1797 * Get a socket option. Because we don't know the option lengths we have
1798 * to pass a user mode parameter for the protocols to sort out.
1799 */
1800
1801SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1802 char __user *, optval, int __user *, optlen)
1803{
1804 int err, fput_needed;
1805 struct socket *sock;
1806
1807 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1808 if (sock != NULL) {
1809 err = security_socket_getsockopt(sock, level, optname);
1810 if (err)
1811 goto out_put;
1812
1813 if (level == SOL_SOCKET)
1814 err =
1815 sock_getsockopt(sock, level, optname, optval,
1816 optlen);
1817 else
1818 err =
1819 sock->ops->getsockopt(sock, level, optname, optval,
1820 optlen);
1821out_put:
1822 fput_light(sock->file, fput_needed);
1823 }
1824 return err;
1825}
1826
1827/*
1828 * Shutdown a socket.
1829 */
1830
1831SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1832{
1833 int err, fput_needed;
1834 struct socket *sock;
1835
1836 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1837 if (sock != NULL) {
1838 err = security_socket_shutdown(sock, how);
1839 if (!err)
1840 err = sock->ops->shutdown(sock, how);
1841 fput_light(sock->file, fput_needed);
1842 }
1843 return err;
1844}
1845
1846/* A couple of helpful macros for getting the address of the 32/64 bit
1847 * fields which are the same type (int / unsigned) on our platforms.
1848 */
1849#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1850#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1851#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1852
1853struct used_address {
1854 struct sockaddr_storage name;
1855 unsigned int name_len;
1856};
1857
1858static int copy_msghdr_from_user(struct msghdr *kmsg,
1859 struct user_msghdr __user *umsg,
1860 struct sockaddr __user **save_addr,
1861 struct iovec **iov)
1862{
1863 struct sockaddr __user *uaddr;
1864 struct iovec __user *uiov;
1865 size_t nr_segs;
1866 ssize_t err;
1867
1868 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
1869 __get_user(uaddr, &umsg->msg_name) ||
1870 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
1871 __get_user(uiov, &umsg->msg_iov) ||
1872 __get_user(nr_segs, &umsg->msg_iovlen) ||
1873 __get_user(kmsg->msg_control, &umsg->msg_control) ||
1874 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
1875 __get_user(kmsg->msg_flags, &umsg->msg_flags))
1876 return -EFAULT;
1877
1878 if (!uaddr)
1879 kmsg->msg_namelen = 0;
1880
1881 if (kmsg->msg_namelen < 0)
1882 return -EINVAL;
1883
1884 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
1885 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
1886
1887 if (save_addr)
1888 *save_addr = uaddr;
1889
1890 if (uaddr && kmsg->msg_namelen) {
1891 if (!save_addr) {
1892 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
1893 kmsg->msg_name);
1894 if (err < 0)
1895 return err;
1896 }
1897 } else {
1898 kmsg->msg_name = NULL;
1899 kmsg->msg_namelen = 0;
1900 }
1901
1902 if (nr_segs > UIO_MAXIOV)
1903 return -EMSGSIZE;
1904
1905 kmsg->msg_iocb = NULL;
1906
1907 return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
1908 UIO_FASTIOV, iov, &kmsg->msg_iter);
1909}
1910
1911static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
1912 struct msghdr *msg_sys, unsigned int flags,
1913 struct used_address *used_address,
1914 unsigned int allowed_msghdr_flags)
1915{
1916 struct compat_msghdr __user *msg_compat =
1917 (struct compat_msghdr __user *)msg;
1918 struct sockaddr_storage address;
1919 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1920 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1921 __aligned(sizeof(__kernel_size_t));
1922 /* 20 is size of ipv6_pktinfo */
1923 unsigned char *ctl_buf = ctl;
1924 int ctl_len;
1925 ssize_t err;
1926
1927 msg_sys->msg_name = &address;
1928
1929 if (MSG_CMSG_COMPAT & flags)
1930 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
1931 else
1932 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
1933 if (err < 0)
1934 return err;
1935
1936 err = -ENOBUFS;
1937
1938 if (msg_sys->msg_controllen > INT_MAX)
1939 goto out_freeiov;
1940 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
1941 ctl_len = msg_sys->msg_controllen;
1942 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1943 err =
1944 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
1945 sizeof(ctl));
1946 if (err)
1947 goto out_freeiov;
1948 ctl_buf = msg_sys->msg_control;
1949 ctl_len = msg_sys->msg_controllen;
1950 } else if (ctl_len) {
1951 if (ctl_len > sizeof(ctl)) {
1952 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1953 if (ctl_buf == NULL)
1954 goto out_freeiov;
1955 }
1956 err = -EFAULT;
1957 /*
1958 * Careful! Before this, msg_sys->msg_control contains a user pointer.
1959 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1960 * checking falls down on this.
1961 */
1962 if (copy_from_user(ctl_buf,
1963 (void __user __force *)msg_sys->msg_control,
1964 ctl_len))
1965 goto out_freectl;
1966 msg_sys->msg_control = ctl_buf;
1967 }
1968 msg_sys->msg_flags = flags;
1969
1970 if (sock->file->f_flags & O_NONBLOCK)
1971 msg_sys->msg_flags |= MSG_DONTWAIT;
1972 /*
1973 * If this is sendmmsg() and current destination address is same as
1974 * previously succeeded address, omit asking LSM's decision.
1975 * used_address->name_len is initialized to UINT_MAX so that the first
1976 * destination address never matches.
1977 */
1978 if (used_address && msg_sys->msg_name &&
1979 used_address->name_len == msg_sys->msg_namelen &&
1980 !memcmp(&used_address->name, msg_sys->msg_name,
1981 used_address->name_len)) {
1982 err = sock_sendmsg_nosec(sock, msg_sys);
1983 goto out_freectl;
1984 }
1985 err = sock_sendmsg(sock, msg_sys);
1986 /*
1987 * If this is sendmmsg() and sending to current destination address was
1988 * successful, remember it.
1989 */
1990 if (used_address && err >= 0) {
1991 used_address->name_len = msg_sys->msg_namelen;
1992 if (msg_sys->msg_name)
1993 memcpy(&used_address->name, msg_sys->msg_name,
1994 used_address->name_len);
1995 }
1996
1997out_freectl:
1998 if (ctl_buf != ctl)
1999 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2000out_freeiov:
2001 kfree(iov);
2002 return err;
2003}
2004
2005/*
2006 * BSD sendmsg interface
2007 */
2008
2009long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
2010{
2011 int fput_needed, err;
2012 struct msghdr msg_sys;
2013 struct socket *sock;
2014
2015 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2016 if (!sock)
2017 goto out;
2018
2019 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
2020
2021 fput_light(sock->file, fput_needed);
2022out:
2023 return err;
2024}
2025
2026SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
2027{
2028 if (flags & MSG_CMSG_COMPAT)
2029 return -EINVAL;
2030 return __sys_sendmsg(fd, msg, flags);
2031}
2032
2033/*
2034 * Linux sendmmsg interface
2035 */
2036
2037int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2038 unsigned int flags)
2039{
2040 int fput_needed, err, datagrams;
2041 struct socket *sock;
2042 struct mmsghdr __user *entry;
2043 struct compat_mmsghdr __user *compat_entry;
2044 struct msghdr msg_sys;
2045 struct used_address used_address;
2046 unsigned int oflags = flags;
2047
2048 if (vlen > UIO_MAXIOV)
2049 vlen = UIO_MAXIOV;
2050
2051 datagrams = 0;
2052
2053 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2054 if (!sock)
2055 return err;
2056
2057 used_address.name_len = UINT_MAX;
2058 entry = mmsg;
2059 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2060 err = 0;
2061 flags |= MSG_BATCH;
2062
2063 while (datagrams < vlen) {
2064 if (datagrams == vlen - 1)
2065 flags = oflags;
2066
2067 if (MSG_CMSG_COMPAT & flags) {
2068 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
2069 &msg_sys, flags, &used_address, MSG_EOR);
2070 if (err < 0)
2071 break;
2072 err = __put_user(err, &compat_entry->msg_len);
2073 ++compat_entry;
2074 } else {
2075 err = ___sys_sendmsg(sock,
2076 (struct user_msghdr __user *)entry,
2077 &msg_sys, flags, &used_address, MSG_EOR);
2078 if (err < 0)
2079 break;
2080 err = put_user(err, &entry->msg_len);
2081 ++entry;
2082 }
2083
2084 if (err)
2085 break;
2086 ++datagrams;
2087 if (msg_data_left(&msg_sys))
2088 break;
2089 cond_resched();
2090 }
2091
2092 fput_light(sock->file, fput_needed);
2093
2094 /* We only return an error if no datagrams were able to be sent */
2095 if (datagrams != 0)
2096 return datagrams;
2097
2098 return err;
2099}
2100
2101SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2102 unsigned int, vlen, unsigned int, flags)
2103{
2104 if (flags & MSG_CMSG_COMPAT)
2105 return -EINVAL;
2106 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2107}
2108
2109static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
2110 struct msghdr *msg_sys, unsigned int flags, int nosec)
2111{
2112 struct compat_msghdr __user *msg_compat =
2113 (struct compat_msghdr __user *)msg;
2114 struct iovec iovstack[UIO_FASTIOV];
2115 struct iovec *iov = iovstack;
2116 unsigned long cmsg_ptr;
2117 int len;
2118 ssize_t err;
2119
2120 /* kernel mode address */
2121 struct sockaddr_storage addr;
2122
2123 /* user mode address pointers */
2124 struct sockaddr __user *uaddr;
2125 int __user *uaddr_len = COMPAT_NAMELEN(msg);
2126
2127 msg_sys->msg_name = &addr;
2128
2129 if (MSG_CMSG_COMPAT & flags)
2130 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
2131 else
2132 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
2133 if (err < 0)
2134 return err;
2135
2136 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2137 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2138
2139 /* We assume all kernel code knows the size of sockaddr_storage */
2140 msg_sys->msg_namelen = 0;
2141
2142 if (sock->file->f_flags & O_NONBLOCK)
2143 flags |= MSG_DONTWAIT;
2144 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
2145 if (err < 0)
2146 goto out_freeiov;
2147 len = err;
2148
2149 if (uaddr != NULL) {
2150 err = move_addr_to_user(&addr,
2151 msg_sys->msg_namelen, uaddr,
2152 uaddr_len);
2153 if (err < 0)
2154 goto out_freeiov;
2155 }
2156 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2157 COMPAT_FLAGS(msg));
2158 if (err)
2159 goto out_freeiov;
2160 if (MSG_CMSG_COMPAT & flags)
2161 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2162 &msg_compat->msg_controllen);
2163 else
2164 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2165 &msg->msg_controllen);
2166 if (err)
2167 goto out_freeiov;
2168 err = len;
2169
2170out_freeiov:
2171 kfree(iov);
2172 return err;
2173}
2174
2175/*
2176 * BSD recvmsg interface
2177 */
2178
2179long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
2180{
2181 int fput_needed, err;
2182 struct msghdr msg_sys;
2183 struct socket *sock;
2184
2185 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2186 if (!sock)
2187 goto out;
2188
2189 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2190
2191 fput_light(sock->file, fput_needed);
2192out:
2193 return err;
2194}
2195
2196SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
2197 unsigned int, flags)
2198{
2199 if (flags & MSG_CMSG_COMPAT)
2200 return -EINVAL;
2201 return __sys_recvmsg(fd, msg, flags);
2202}
2203
2204/*
2205 * Linux recvmmsg interface
2206 */
2207
2208int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2209 unsigned int flags, struct timespec *timeout)
2210{
2211 int fput_needed, err, datagrams;
2212 struct socket *sock;
2213 struct mmsghdr __user *entry;
2214 struct compat_mmsghdr __user *compat_entry;
2215 struct msghdr msg_sys;
2216 struct timespec64 end_time;
2217 struct timespec64 timeout64;
2218
2219 if (timeout &&
2220 poll_select_set_timeout(&end_time, timeout->tv_sec,
2221 timeout->tv_nsec))
2222 return -EINVAL;
2223
2224 datagrams = 0;
2225
2226 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2227 if (!sock)
2228 return err;
2229
2230 err = sock_error(sock->sk);
2231 if (err) {
2232 datagrams = err;
2233 goto out_put;
2234 }
2235
2236 entry = mmsg;
2237 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2238
2239 while (datagrams < vlen) {
2240 /*
2241 * No need to ask LSM for more than the first datagram.
2242 */
2243 if (MSG_CMSG_COMPAT & flags) {
2244 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
2245 &msg_sys, flags & ~MSG_WAITFORONE,
2246 datagrams);
2247 if (err < 0)
2248 break;
2249 err = __put_user(err, &compat_entry->msg_len);
2250 ++compat_entry;
2251 } else {
2252 err = ___sys_recvmsg(sock,
2253 (struct user_msghdr __user *)entry,
2254 &msg_sys, flags & ~MSG_WAITFORONE,
2255 datagrams);
2256 if (err < 0)
2257 break;
2258 err = put_user(err, &entry->msg_len);
2259 ++entry;
2260 }
2261
2262 if (err)
2263 break;
2264 ++datagrams;
2265
2266 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2267 if (flags & MSG_WAITFORONE)
2268 flags |= MSG_DONTWAIT;
2269
2270 if (timeout) {
2271 ktime_get_ts64(&timeout64);
2272 *timeout = timespec64_to_timespec(
2273 timespec64_sub(end_time, timeout64));
2274 if (timeout->tv_sec < 0) {
2275 timeout->tv_sec = timeout->tv_nsec = 0;
2276 break;
2277 }
2278
2279 /* Timeout, return less than vlen datagrams */
2280 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2281 break;
2282 }
2283
2284 /* Out of band data, return right away */
2285 if (msg_sys.msg_flags & MSG_OOB)
2286 break;
2287 cond_resched();
2288 }
2289
2290 if (err == 0)
2291 goto out_put;
2292
2293 if (datagrams == 0) {
2294 datagrams = err;
2295 goto out_put;
2296 }
2297
2298 /*
2299 * We may return less entries than requested (vlen) if the
2300 * sock is non block and there aren't enough datagrams...
2301 */
2302 if (err != -EAGAIN) {
2303 /*
2304 * ... or if recvmsg returns an error after we
2305 * received some datagrams, where we record the
2306 * error to return on the next call or if the
2307 * app asks about it using getsockopt(SO_ERROR).
2308 */
2309 sock->sk->sk_err = -err;
2310 }
2311out_put:
2312 fput_light(sock->file, fput_needed);
2313
2314 return datagrams;
2315}
2316
2317SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2318 unsigned int, vlen, unsigned int, flags,
2319 struct timespec __user *, timeout)
2320{
2321 int datagrams;
2322 struct timespec timeout_sys;
2323
2324 if (flags & MSG_CMSG_COMPAT)
2325 return -EINVAL;
2326
2327 if (!timeout)
2328 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2329
2330 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2331 return -EFAULT;
2332
2333 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2334
2335 if (datagrams > 0 &&
2336 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2337 datagrams = -EFAULT;
2338
2339 return datagrams;
2340}
2341
2342#ifdef __ARCH_WANT_SYS_SOCKETCALL
2343/* Argument list sizes for sys_socketcall */
2344#define AL(x) ((x) * sizeof(unsigned long))
2345static const unsigned char nargs[21] = {
2346 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2347 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2348 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2349 AL(4), AL(5), AL(4)
2350};
2351
2352#undef AL
2353
2354/*
2355 * System call vectors.
2356 *
2357 * Argument checking cleaned up. Saved 20% in size.
2358 * This function doesn't need to set the kernel lock because
2359 * it is set by the callees.
2360 */
2361
2362SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2363{
2364 unsigned long a[AUDITSC_ARGS];
2365 unsigned long a0, a1;
2366 int err;
2367 unsigned int len;
2368
2369 if (call < 1 || call > SYS_SENDMMSG)
2370 return -EINVAL;
2371
2372 len = nargs[call];
2373 if (len > sizeof(a))
2374 return -EINVAL;
2375
2376 /* copy_from_user should be SMP safe. */
2377 if (copy_from_user(a, args, len))
2378 return -EFAULT;
2379
2380 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2381 if (err)
2382 return err;
2383
2384 a0 = a[0];
2385 a1 = a[1];
2386
2387 switch (call) {
2388 case SYS_SOCKET:
2389 err = sys_socket(a0, a1, a[2]);
2390 break;
2391 case SYS_BIND:
2392 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2393 break;
2394 case SYS_CONNECT:
2395 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2396 break;
2397 case SYS_LISTEN:
2398 err = sys_listen(a0, a1);
2399 break;
2400 case SYS_ACCEPT:
2401 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2402 (int __user *)a[2], 0);
2403 break;
2404 case SYS_GETSOCKNAME:
2405 err =
2406 sys_getsockname(a0, (struct sockaddr __user *)a1,
2407 (int __user *)a[2]);
2408 break;
2409 case SYS_GETPEERNAME:
2410 err =
2411 sys_getpeername(a0, (struct sockaddr __user *)a1,
2412 (int __user *)a[2]);
2413 break;
2414 case SYS_SOCKETPAIR:
2415 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2416 break;
2417 case SYS_SEND:
2418 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2419 break;
2420 case SYS_SENDTO:
2421 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2422 (struct sockaddr __user *)a[4], a[5]);
2423 break;
2424 case SYS_RECV:
2425 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2426 break;
2427 case SYS_RECVFROM:
2428 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2429 (struct sockaddr __user *)a[4],
2430 (int __user *)a[5]);
2431 break;
2432 case SYS_SHUTDOWN:
2433 err = sys_shutdown(a0, a1);
2434 break;
2435 case SYS_SETSOCKOPT:
2436 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2437 break;
2438 case SYS_GETSOCKOPT:
2439 err =
2440 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2441 (int __user *)a[4]);
2442 break;
2443 case SYS_SENDMSG:
2444 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
2445 break;
2446 case SYS_SENDMMSG:
2447 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2448 break;
2449 case SYS_RECVMSG:
2450 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
2451 break;
2452 case SYS_RECVMMSG:
2453 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2454 (struct timespec __user *)a[4]);
2455 break;
2456 case SYS_ACCEPT4:
2457 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2458 (int __user *)a[2], a[3]);
2459 break;
2460 default:
2461 err = -EINVAL;
2462 break;
2463 }
2464 return err;
2465}
2466
2467#endif /* __ARCH_WANT_SYS_SOCKETCALL */
2468
2469/**
2470 * sock_register - add a socket protocol handler
2471 * @ops: description of protocol
2472 *
2473 * This function is called by a protocol handler that wants to
2474 * advertise its address family, and have it linked into the
2475 * socket interface. The value ops->family corresponds to the
2476 * socket system call protocol family.
2477 */
2478int sock_register(const struct net_proto_family *ops)
2479{
2480 int err;
2481
2482 if (ops->family >= NPROTO) {
2483 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
2484 return -ENOBUFS;
2485 }
2486
2487 spin_lock(&net_family_lock);
2488 if (rcu_dereference_protected(net_families[ops->family],
2489 lockdep_is_held(&net_family_lock)))
2490 err = -EEXIST;
2491 else {
2492 rcu_assign_pointer(net_families[ops->family], ops);
2493 err = 0;
2494 }
2495 spin_unlock(&net_family_lock);
2496
2497 pr_info("NET: Registered protocol family %d\n", ops->family);
2498 return err;
2499}
2500EXPORT_SYMBOL(sock_register);
2501
2502/**
2503 * sock_unregister - remove a protocol handler
2504 * @family: protocol family to remove
2505 *
2506 * This function is called by a protocol handler that wants to
2507 * remove its address family, and have it unlinked from the
2508 * new socket creation.
2509 *
2510 * If protocol handler is a module, then it can use module reference
2511 * counts to protect against new references. If protocol handler is not
2512 * a module then it needs to provide its own protection in
2513 * the ops->create routine.
2514 */
2515void sock_unregister(int family)
2516{
2517 BUG_ON(family < 0 || family >= NPROTO);
2518
2519 spin_lock(&net_family_lock);
2520 RCU_INIT_POINTER(net_families[family], NULL);
2521 spin_unlock(&net_family_lock);
2522
2523 synchronize_rcu();
2524
2525 pr_info("NET: Unregistered protocol family %d\n", family);
2526}
2527EXPORT_SYMBOL(sock_unregister);
2528
2529static int __init sock_init(void)
2530{
2531 int err;
2532 /*
2533 * Initialize the network sysctl infrastructure.
2534 */
2535 err = net_sysctl_init();
2536 if (err)
2537 goto out;
2538
2539 /*
2540 * Initialize skbuff SLAB cache
2541 */
2542 skb_init();
2543
2544 /*
2545 * Initialize the protocols module.
2546 */
2547
2548 init_inodecache();
2549
2550 err = register_filesystem(&sock_fs_type);
2551 if (err)
2552 goto out_fs;
2553 sock_mnt = kern_mount(&sock_fs_type);
2554 if (IS_ERR(sock_mnt)) {
2555 err = PTR_ERR(sock_mnt);
2556 goto out_mount;
2557 }
2558
2559 /* The real protocol initialization is performed in later initcalls.
2560 */
2561
2562#ifdef CONFIG_NETFILTER
2563 err = netfilter_init();
2564 if (err)
2565 goto out;
2566#endif
2567
2568 ptp_classifier_init();
2569
2570out:
2571 return err;
2572
2573out_mount:
2574 unregister_filesystem(&sock_fs_type);
2575out_fs:
2576 goto out;
2577}
2578
2579core_initcall(sock_init); /* early initcall */
2580
2581#ifdef CONFIG_PROC_FS
2582void socket_seq_show(struct seq_file *seq)
2583{
2584 int cpu;
2585 int counter = 0;
2586
2587 for_each_possible_cpu(cpu)
2588 counter += per_cpu(sockets_in_use, cpu);
2589
2590 /* It can be negative, by the way. 8) */
2591 if (counter < 0)
2592 counter = 0;
2593
2594 seq_printf(seq, "sockets: used %d\n", counter);
2595}
2596#endif /* CONFIG_PROC_FS */
2597
2598#ifdef CONFIG_COMPAT
2599static int do_siocgstamp(struct net *net, struct socket *sock,
2600 unsigned int cmd, void __user *up)
2601{
2602 mm_segment_t old_fs = get_fs();
2603 struct timeval ktv;
2604 int err;
2605
2606 set_fs(KERNEL_DS);
2607 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2608 set_fs(old_fs);
2609 if (!err)
2610 err = compat_put_timeval(&ktv, up);
2611
2612 return err;
2613}
2614
2615static int do_siocgstampns(struct net *net, struct socket *sock,
2616 unsigned int cmd, void __user *up)
2617{
2618 mm_segment_t old_fs = get_fs();
2619 struct timespec kts;
2620 int err;
2621
2622 set_fs(KERNEL_DS);
2623 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2624 set_fs(old_fs);
2625 if (!err)
2626 err = compat_put_timespec(&kts, up);
2627
2628 return err;
2629}
2630
2631static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2632{
2633 struct ifreq __user *uifr;
2634 int err;
2635
2636 uifr = compat_alloc_user_space(sizeof(struct ifreq));
2637 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2638 return -EFAULT;
2639
2640 err = dev_ioctl(net, SIOCGIFNAME, uifr);
2641 if (err)
2642 return err;
2643
2644 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2645 return -EFAULT;
2646
2647 return 0;
2648}
2649
2650static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2651{
2652 struct compat_ifconf ifc32;
2653 struct ifconf ifc;
2654 struct ifconf __user *uifc;
2655 struct compat_ifreq __user *ifr32;
2656 struct ifreq __user *ifr;
2657 unsigned int i, j;
2658 int err;
2659
2660 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2661 return -EFAULT;
2662
2663 memset(&ifc, 0, sizeof(ifc));
2664 if (ifc32.ifcbuf == 0) {
2665 ifc32.ifc_len = 0;
2666 ifc.ifc_len = 0;
2667 ifc.ifc_req = NULL;
2668 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2669 } else {
2670 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2671 sizeof(struct ifreq);
2672 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2673 ifc.ifc_len = len;
2674 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2675 ifr32 = compat_ptr(ifc32.ifcbuf);
2676 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2677 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2678 return -EFAULT;
2679 ifr++;
2680 ifr32++;
2681 }
2682 }
2683 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2684 return -EFAULT;
2685
2686 err = dev_ioctl(net, SIOCGIFCONF, uifc);
2687 if (err)
2688 return err;
2689
2690 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2691 return -EFAULT;
2692
2693 ifr = ifc.ifc_req;
2694 ifr32 = compat_ptr(ifc32.ifcbuf);
2695 for (i = 0, j = 0;
2696 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2697 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2698 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2699 return -EFAULT;
2700 ifr32++;
2701 ifr++;
2702 }
2703
2704 if (ifc32.ifcbuf == 0) {
2705 /* Translate from 64-bit structure multiple to
2706 * a 32-bit one.
2707 */
2708 i = ifc.ifc_len;
2709 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2710 ifc32.ifc_len = i;
2711 } else {
2712 ifc32.ifc_len = i;
2713 }
2714 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2715 return -EFAULT;
2716
2717 return 0;
2718}
2719
2720static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2721{
2722 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2723 bool convert_in = false, convert_out = false;
2724 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2725 struct ethtool_rxnfc __user *rxnfc;
2726 struct ifreq __user *ifr;
2727 u32 rule_cnt = 0, actual_rule_cnt;
2728 u32 ethcmd;
2729 u32 data;
2730 int ret;
2731
2732 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2733 return -EFAULT;
2734
2735 compat_rxnfc = compat_ptr(data);
2736
2737 if (get_user(ethcmd, &compat_rxnfc->cmd))
2738 return -EFAULT;
2739
2740 /* Most ethtool structures are defined without padding.
2741 * Unfortunately struct ethtool_rxnfc is an exception.
2742 */
2743 switch (ethcmd) {
2744 default:
2745 break;
2746 case ETHTOOL_GRXCLSRLALL:
2747 /* Buffer size is variable */
2748 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2749 return -EFAULT;
2750 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2751 return -ENOMEM;
2752 buf_size += rule_cnt * sizeof(u32);
2753 /* fall through */
2754 case ETHTOOL_GRXRINGS:
2755 case ETHTOOL_GRXCLSRLCNT:
2756 case ETHTOOL_GRXCLSRULE:
2757 case ETHTOOL_SRXCLSRLINS:
2758 convert_out = true;
2759 /* fall through */
2760 case ETHTOOL_SRXCLSRLDEL:
2761 buf_size += sizeof(struct ethtool_rxnfc);
2762 convert_in = true;
2763 break;
2764 }
2765
2766 ifr = compat_alloc_user_space(buf_size);
2767 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
2768
2769 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2770 return -EFAULT;
2771
2772 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2773 &ifr->ifr_ifru.ifru_data))
2774 return -EFAULT;
2775
2776 if (convert_in) {
2777 /* We expect there to be holes between fs.m_ext and
2778 * fs.ring_cookie and at the end of fs, but nowhere else.
2779 */
2780 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2781 sizeof(compat_rxnfc->fs.m_ext) !=
2782 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2783 sizeof(rxnfc->fs.m_ext));
2784 BUILD_BUG_ON(
2785 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2786 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2787 offsetof(struct ethtool_rxnfc, fs.location) -
2788 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2789
2790 if (copy_in_user(rxnfc, compat_rxnfc,
2791 (void __user *)(&rxnfc->fs.m_ext + 1) -
2792 (void __user *)rxnfc) ||
2793 copy_in_user(&rxnfc->fs.ring_cookie,
2794 &compat_rxnfc->fs.ring_cookie,
2795 (void __user *)(&rxnfc->fs.location + 1) -
2796 (void __user *)&rxnfc->fs.ring_cookie) ||
2797 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2798 sizeof(rxnfc->rule_cnt)))
2799 return -EFAULT;
2800 }
2801
2802 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2803 if (ret)
2804 return ret;
2805
2806 if (convert_out) {
2807 if (copy_in_user(compat_rxnfc, rxnfc,
2808 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2809 (const void __user *)rxnfc) ||
2810 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2811 &rxnfc->fs.ring_cookie,
2812 (const void __user *)(&rxnfc->fs.location + 1) -
2813 (const void __user *)&rxnfc->fs.ring_cookie) ||
2814 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2815 sizeof(rxnfc->rule_cnt)))
2816 return -EFAULT;
2817
2818 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2819 /* As an optimisation, we only copy the actual
2820 * number of rules that the underlying
2821 * function returned. Since Mallory might
2822 * change the rule count in user memory, we
2823 * check that it is less than the rule count
2824 * originally given (as the user buffer size),
2825 * which has been range-checked.
2826 */
2827 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2828 return -EFAULT;
2829 if (actual_rule_cnt < rule_cnt)
2830 rule_cnt = actual_rule_cnt;
2831 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2832 &rxnfc->rule_locs[0],
2833 rule_cnt * sizeof(u32)))
2834 return -EFAULT;
2835 }
2836 }
2837
2838 return 0;
2839}
2840
2841static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2842{
2843 void __user *uptr;
2844 compat_uptr_t uptr32;
2845 struct ifreq __user *uifr;
2846
2847 uifr = compat_alloc_user_space(sizeof(*uifr));
2848 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2849 return -EFAULT;
2850
2851 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2852 return -EFAULT;
2853
2854 uptr = compat_ptr(uptr32);
2855
2856 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2857 return -EFAULT;
2858
2859 return dev_ioctl(net, SIOCWANDEV, uifr);
2860}
2861
2862static int bond_ioctl(struct net *net, unsigned int cmd,
2863 struct compat_ifreq __user *ifr32)
2864{
2865 struct ifreq kifr;
2866 mm_segment_t old_fs;
2867 int err;
2868
2869 switch (cmd) {
2870 case SIOCBONDENSLAVE:
2871 case SIOCBONDRELEASE:
2872 case SIOCBONDSETHWADDR:
2873 case SIOCBONDCHANGEACTIVE:
2874 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2875 return -EFAULT;
2876
2877 old_fs = get_fs();
2878 set_fs(KERNEL_DS);
2879 err = dev_ioctl(net, cmd,
2880 (struct ifreq __user __force *) &kifr);
2881 set_fs(old_fs);
2882
2883 return err;
2884 default:
2885 return -ENOIOCTLCMD;
2886 }
2887}
2888
2889/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2890static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
2891 struct compat_ifreq __user *u_ifreq32)
2892{
2893 struct ifreq __user *u_ifreq64;
2894 char tmp_buf[IFNAMSIZ];
2895 void __user *data64;
2896 u32 data32;
2897
2898 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2899 IFNAMSIZ))
2900 return -EFAULT;
2901 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
2902 return -EFAULT;
2903 data64 = compat_ptr(data32);
2904
2905 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2906
2907 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2908 IFNAMSIZ))
2909 return -EFAULT;
2910 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
2911 return -EFAULT;
2912
2913 return dev_ioctl(net, cmd, u_ifreq64);
2914}
2915
2916static int dev_ifsioc(struct net *net, struct socket *sock,
2917 unsigned int cmd, struct compat_ifreq __user *uifr32)
2918{
2919 struct ifreq __user *uifr;
2920 int err;
2921
2922 uifr = compat_alloc_user_space(sizeof(*uifr));
2923 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2924 return -EFAULT;
2925
2926 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2927
2928 if (!err) {
2929 switch (cmd) {
2930 case SIOCGIFFLAGS:
2931 case SIOCGIFMETRIC:
2932 case SIOCGIFMTU:
2933 case SIOCGIFMEM:
2934 case SIOCGIFHWADDR:
2935 case SIOCGIFINDEX:
2936 case SIOCGIFADDR:
2937 case SIOCGIFBRDADDR:
2938 case SIOCGIFDSTADDR:
2939 case SIOCGIFNETMASK:
2940 case SIOCGIFPFLAGS:
2941 case SIOCGIFTXQLEN:
2942 case SIOCGMIIPHY:
2943 case SIOCGMIIREG:
2944 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
2945 err = -EFAULT;
2946 break;
2947 }
2948 }
2949 return err;
2950}
2951
2952static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2953 struct compat_ifreq __user *uifr32)
2954{
2955 struct ifreq ifr;
2956 struct compat_ifmap __user *uifmap32;
2957 mm_segment_t old_fs;
2958 int err;
2959
2960 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2961 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
2962 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2963 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2964 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2965 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
2966 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
2967 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
2968 if (err)
2969 return -EFAULT;
2970
2971 old_fs = get_fs();
2972 set_fs(KERNEL_DS);
2973 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
2974 set_fs(old_fs);
2975
2976 if (cmd == SIOCGIFMAP && !err) {
2977 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
2978 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2979 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2980 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2981 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
2982 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
2983 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
2984 if (err)
2985 err = -EFAULT;
2986 }
2987 return err;
2988}
2989
2990struct rtentry32 {
2991 u32 rt_pad1;
2992 struct sockaddr rt_dst; /* target address */
2993 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
2994 struct sockaddr rt_genmask; /* target network mask (IP) */
2995 unsigned short rt_flags;
2996 short rt_pad2;
2997 u32 rt_pad3;
2998 unsigned char rt_tos;
2999 unsigned char rt_class;
3000 short rt_pad4;
3001 short rt_metric; /* +1 for binary compatibility! */
3002 /* char * */ u32 rt_dev; /* forcing the device at add */
3003 u32 rt_mtu; /* per route MTU/Window */
3004 u32 rt_window; /* Window clamping */
3005 unsigned short rt_irtt; /* Initial RTT */
3006};
3007
3008struct in6_rtmsg32 {
3009 struct in6_addr rtmsg_dst;
3010 struct in6_addr rtmsg_src;
3011 struct in6_addr rtmsg_gateway;
3012 u32 rtmsg_type;
3013 u16 rtmsg_dst_len;
3014 u16 rtmsg_src_len;
3015 u32 rtmsg_metric;
3016 u32 rtmsg_info;
3017 u32 rtmsg_flags;
3018 s32 rtmsg_ifindex;
3019};
3020
3021static int routing_ioctl(struct net *net, struct socket *sock,
3022 unsigned int cmd, void __user *argp)
3023{
3024 int ret;
3025 void *r = NULL;
3026 struct in6_rtmsg r6;
3027 struct rtentry r4;
3028 char devname[16];
3029 u32 rtdev;
3030 mm_segment_t old_fs = get_fs();
3031
3032 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3033 struct in6_rtmsg32 __user *ur6 = argp;
3034 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3035 3 * sizeof(struct in6_addr));
3036 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3037 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3038 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3039 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3040 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3041 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3042 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3043
3044 r = (void *) &r6;
3045 } else { /* ipv4 */
3046 struct rtentry32 __user *ur4 = argp;
3047 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3048 3 * sizeof(struct sockaddr));
3049 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3050 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3051 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3052 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3053 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3054 ret |= get_user(rtdev, &(ur4->rt_dev));
3055 if (rtdev) {
3056 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3057 r4.rt_dev = (char __user __force *)devname;
3058 devname[15] = 0;
3059 } else
3060 r4.rt_dev = NULL;
3061
3062 r = (void *) &r4;
3063 }
3064
3065 if (ret) {
3066 ret = -EFAULT;
3067 goto out;
3068 }
3069
3070 set_fs(KERNEL_DS);
3071 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3072 set_fs(old_fs);
3073
3074out:
3075 return ret;
3076}
3077
3078/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3079 * for some operations; this forces use of the newer bridge-utils that
3080 * use compatible ioctls
3081 */
3082static int old_bridge_ioctl(compat_ulong_t __user *argp)
3083{
3084 compat_ulong_t tmp;
3085
3086 if (get_user(tmp, argp))
3087 return -EFAULT;
3088 if (tmp == BRCTL_GET_VERSION)
3089 return BRCTL_VERSION + 1;
3090 return -EINVAL;
3091}
3092
3093static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3094 unsigned int cmd, unsigned long arg)
3095{
3096 void __user *argp = compat_ptr(arg);
3097 struct sock *sk = sock->sk;
3098 struct net *net = sock_net(sk);
3099
3100 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3101 return compat_ifr_data_ioctl(net, cmd, argp);
3102
3103 switch (cmd) {
3104 case SIOCSIFBR:
3105 case SIOCGIFBR:
3106 return old_bridge_ioctl(argp);
3107 case SIOCGIFNAME:
3108 return dev_ifname32(net, argp);
3109 case SIOCGIFCONF:
3110 return dev_ifconf(net, argp);
3111 case SIOCETHTOOL:
3112 return ethtool_ioctl(net, argp);
3113 case SIOCWANDEV:
3114 return compat_siocwandev(net, argp);
3115 case SIOCGIFMAP:
3116 case SIOCSIFMAP:
3117 return compat_sioc_ifmap(net, cmd, argp);
3118 case SIOCBONDENSLAVE:
3119 case SIOCBONDRELEASE:
3120 case SIOCBONDSETHWADDR:
3121 case SIOCBONDCHANGEACTIVE:
3122 return bond_ioctl(net, cmd, argp);
3123 case SIOCADDRT:
3124 case SIOCDELRT:
3125 return routing_ioctl(net, sock, cmd, argp);
3126 case SIOCGSTAMP:
3127 return do_siocgstamp(net, sock, cmd, argp);
3128 case SIOCGSTAMPNS:
3129 return do_siocgstampns(net, sock, cmd, argp);
3130 case SIOCBONDSLAVEINFOQUERY:
3131 case SIOCBONDINFOQUERY:
3132 case SIOCSHWTSTAMP:
3133 case SIOCGHWTSTAMP:
3134 return compat_ifr_data_ioctl(net, cmd, argp);
3135
3136 case FIOSETOWN:
3137 case SIOCSPGRP:
3138 case FIOGETOWN:
3139 case SIOCGPGRP:
3140 case SIOCBRADDBR:
3141 case SIOCBRDELBR:
3142 case SIOCGIFVLAN:
3143 case SIOCSIFVLAN:
3144 case SIOCADDDLCI:
3145 case SIOCDELDLCI:
3146 case SIOCGSKNS:
3147 return sock_ioctl(file, cmd, arg);
3148
3149 case SIOCGIFFLAGS:
3150 case SIOCSIFFLAGS:
3151 case SIOCGIFMETRIC:
3152 case SIOCSIFMETRIC:
3153 case SIOCGIFMTU:
3154 case SIOCSIFMTU:
3155 case SIOCGIFMEM:
3156 case SIOCSIFMEM:
3157 case SIOCGIFHWADDR:
3158 case SIOCSIFHWADDR:
3159 case SIOCADDMULTI:
3160 case SIOCDELMULTI:
3161 case SIOCGIFINDEX:
3162 case SIOCGIFADDR:
3163 case SIOCSIFADDR:
3164 case SIOCSIFHWBROADCAST:
3165 case SIOCDIFADDR:
3166 case SIOCGIFBRDADDR:
3167 case SIOCSIFBRDADDR:
3168 case SIOCGIFDSTADDR:
3169 case SIOCSIFDSTADDR:
3170 case SIOCGIFNETMASK:
3171 case SIOCSIFNETMASK:
3172 case SIOCSIFPFLAGS:
3173 case SIOCGIFPFLAGS:
3174 case SIOCGIFTXQLEN:
3175 case SIOCSIFTXQLEN:
3176 case SIOCBRADDIF:
3177 case SIOCBRDELIF:
3178 case SIOCSIFNAME:
3179 case SIOCGMIIPHY:
3180 case SIOCGMIIREG:
3181 case SIOCSMIIREG:
3182 return dev_ifsioc(net, sock, cmd, argp);
3183
3184 case SIOCSARP:
3185 case SIOCGARP:
3186 case SIOCDARP:
3187 case SIOCATMARK:
3188 return sock_do_ioctl(net, sock, cmd, arg);
3189 }
3190
3191 return -ENOIOCTLCMD;
3192}
3193
3194static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3195 unsigned long arg)
3196{
3197 struct socket *sock = file->private_data;
3198 int ret = -ENOIOCTLCMD;
3199 struct sock *sk;
3200 struct net *net;
3201
3202 sk = sock->sk;
3203 net = sock_net(sk);
3204
3205 if (sock->ops->compat_ioctl)
3206 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3207
3208 if (ret == -ENOIOCTLCMD &&
3209 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3210 ret = compat_wext_handle_ioctl(net, cmd, arg);
3211
3212 if (ret == -ENOIOCTLCMD)
3213 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3214
3215 return ret;
3216}
3217#endif
3218
3219int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3220{
3221 return sock->ops->bind(sock, addr, addrlen);
3222}
3223EXPORT_SYMBOL(kernel_bind);
3224
3225int kernel_listen(struct socket *sock, int backlog)
3226{
3227 return sock->ops->listen(sock, backlog);
3228}
3229EXPORT_SYMBOL(kernel_listen);
3230
3231int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3232{
3233 struct sock *sk = sock->sk;
3234 int err;
3235
3236 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3237 newsock);
3238 if (err < 0)
3239 goto done;
3240
3241 err = sock->ops->accept(sock, *newsock, flags);
3242 if (err < 0) {
3243 sock_release(*newsock);
3244 *newsock = NULL;
3245 goto done;
3246 }
3247
3248 (*newsock)->ops = sock->ops;
3249 __module_get((*newsock)->ops->owner);
3250
3251done:
3252 return err;
3253}
3254EXPORT_SYMBOL(kernel_accept);
3255
3256int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3257 int flags)
3258{
3259 return sock->ops->connect(sock, addr, addrlen, flags);
3260}
3261EXPORT_SYMBOL(kernel_connect);
3262
3263int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3264 int *addrlen)
3265{
3266 return sock->ops->getname(sock, addr, addrlen, 0);
3267}
3268EXPORT_SYMBOL(kernel_getsockname);
3269
3270int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3271 int *addrlen)
3272{
3273 return sock->ops->getname(sock, addr, addrlen, 1);
3274}
3275EXPORT_SYMBOL(kernel_getpeername);
3276
3277int kernel_getsockopt(struct socket *sock, int level, int optname,
3278 char *optval, int *optlen)
3279{
3280 mm_segment_t oldfs = get_fs();
3281 char __user *uoptval;
3282 int __user *uoptlen;
3283 int err;
3284
3285 uoptval = (char __user __force *) optval;
3286 uoptlen = (int __user __force *) optlen;
3287
3288 set_fs(KERNEL_DS);
3289 if (level == SOL_SOCKET)
3290 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3291 else
3292 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3293 uoptlen);
3294 set_fs(oldfs);
3295 return err;
3296}
3297EXPORT_SYMBOL(kernel_getsockopt);
3298
3299int kernel_setsockopt(struct socket *sock, int level, int optname,
3300 char *optval, unsigned int optlen)
3301{
3302 mm_segment_t oldfs = get_fs();
3303 char __user *uoptval;
3304 int err;
3305
3306 uoptval = (char __user __force *) optval;
3307
3308 set_fs(KERNEL_DS);
3309 if (level == SOL_SOCKET)
3310 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3311 else
3312 err = sock->ops->setsockopt(sock, level, optname, uoptval,
3313 optlen);
3314 set_fs(oldfs);
3315 return err;
3316}
3317EXPORT_SYMBOL(kernel_setsockopt);
3318
3319int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3320 size_t size, int flags)
3321{
3322 if (sock->ops->sendpage)
3323 return sock->ops->sendpage(sock, page, offset, size, flags);
3324
3325 return sock_no_sendpage(sock, page, offset, size, flags);
3326}
3327EXPORT_SYMBOL(kernel_sendpage);
3328
3329int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3330{
3331 mm_segment_t oldfs = get_fs();
3332 int err;
3333
3334 set_fs(KERNEL_DS);
3335 err = sock->ops->ioctl(sock, cmd, arg);
3336 set_fs(oldfs);
3337
3338 return err;
3339}
3340EXPORT_SYMBOL(kernel_sock_ioctl);
3341
3342int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3343{
3344 return sock->ops->shutdown(sock, how);
3345}
3346EXPORT_SYMBOL(kernel_sock_shutdown);
1/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
7 * Ross Biro
8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
45 * Tigran Aivazian : Made listen(2) backlog sanity checks
46 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
56 * paradigm.
57 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
61#include <linux/mm.h>
62#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
66#include <linux/thread_info.h>
67#include <linux/rcupdate.h>
68#include <linux/netdevice.h>
69#include <linux/proc_fs.h>
70#include <linux/seq_file.h>
71#include <linux/mutex.h>
72#include <linux/if_bridge.h>
73#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
75#include <linux/ptp_classify.h>
76#include <linux/init.h>
77#include <linux/poll.h>
78#include <linux/cache.h>
79#include <linux/module.h>
80#include <linux/highmem.h>
81#include <linux/mount.h>
82#include <linux/security.h>
83#include <linux/syscalls.h>
84#include <linux/compat.h>
85#include <linux/kmod.h>
86#include <linux/audit.h>
87#include <linux/wireless.h>
88#include <linux/nsproxy.h>
89#include <linux/magic.h>
90#include <linux/slab.h>
91#include <linux/xattr.h>
92
93#include <asm/uaccess.h>
94#include <asm/unistd.h>
95
96#include <net/compat.h>
97#include <net/wext.h>
98#include <net/cls_cgroup.h>
99
100#include <net/sock.h>
101#include <linux/netfilter.h>
102
103#include <linux/if_tun.h>
104#include <linux/ipv6_route.h>
105#include <linux/route.h>
106#include <linux/sockios.h>
107#include <linux/atalk.h>
108#include <net/busy_poll.h>
109
110#ifdef CONFIG_NET_RX_BUSY_POLL
111unsigned int sysctl_net_busy_read __read_mostly;
112unsigned int sysctl_net_busy_poll __read_mostly;
113#endif
114
115static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
116static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
117 unsigned long nr_segs, loff_t pos);
118static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
119 unsigned long nr_segs, loff_t pos);
120static int sock_mmap(struct file *file, struct vm_area_struct *vma);
121
122static int sock_close(struct inode *inode, struct file *file);
123static unsigned int sock_poll(struct file *file,
124 struct poll_table_struct *wait);
125static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
126#ifdef CONFIG_COMPAT
127static long compat_sock_ioctl(struct file *file,
128 unsigned int cmd, unsigned long arg);
129#endif
130static int sock_fasync(int fd, struct file *filp, int on);
131static ssize_t sock_sendpage(struct file *file, struct page *page,
132 int offset, size_t size, loff_t *ppos, int more);
133static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
134 struct pipe_inode_info *pipe, size_t len,
135 unsigned int flags);
136
137/*
138 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
139 * in the operation structures but are done directly via the socketcall() multiplexor.
140 */
141
142static const struct file_operations socket_file_ops = {
143 .owner = THIS_MODULE,
144 .llseek = no_llseek,
145 .aio_read = sock_aio_read,
146 .aio_write = sock_aio_write,
147 .poll = sock_poll,
148 .unlocked_ioctl = sock_ioctl,
149#ifdef CONFIG_COMPAT
150 .compat_ioctl = compat_sock_ioctl,
151#endif
152 .mmap = sock_mmap,
153 .open = sock_no_open, /* special open code to disallow open via /proc */
154 .release = sock_close,
155 .fasync = sock_fasync,
156 .sendpage = sock_sendpage,
157 .splice_write = generic_splice_sendpage,
158 .splice_read = sock_splice_read,
159};
160
161/*
162 * The protocol list. Each protocol is registered in here.
163 */
164
165static DEFINE_SPINLOCK(net_family_lock);
166static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
167
168/*
169 * Statistics counters of the socket lists
170 */
171
172static DEFINE_PER_CPU(int, sockets_in_use);
173
174/*
175 * Support routines.
176 * Move socket addresses back and forth across the kernel/user
177 * divide and look after the messy bits.
178 */
179
180/**
181 * move_addr_to_kernel - copy a socket address into kernel space
182 * @uaddr: Address in user space
183 * @kaddr: Address in kernel space
184 * @ulen: Length in user space
185 *
186 * The address is copied into kernel space. If the provided address is
187 * too long an error code of -EINVAL is returned. If the copy gives
188 * invalid addresses -EFAULT is returned. On a success 0 is returned.
189 */
190
191int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
192{
193 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
194 return -EINVAL;
195 if (ulen == 0)
196 return 0;
197 if (copy_from_user(kaddr, uaddr, ulen))
198 return -EFAULT;
199 return audit_sockaddr(ulen, kaddr);
200}
201
202/**
203 * move_addr_to_user - copy an address to user space
204 * @kaddr: kernel space address
205 * @klen: length of address in kernel
206 * @uaddr: user space address
207 * @ulen: pointer to user length field
208 *
209 * The value pointed to by ulen on entry is the buffer length available.
210 * This is overwritten with the buffer space used. -EINVAL is returned
211 * if an overlong buffer is specified or a negative buffer size. -EFAULT
212 * is returned if either the buffer or the length field are not
213 * accessible.
214 * After copying the data up to the limit the user specifies, the true
215 * length of the data is written over the length limit the user
216 * specified. Zero is returned for a success.
217 */
218
219static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
220 void __user *uaddr, int __user *ulen)
221{
222 int err;
223 int len;
224
225 BUG_ON(klen > sizeof(struct sockaddr_storage));
226 err = get_user(len, ulen);
227 if (err)
228 return err;
229 if (len > klen)
230 len = klen;
231 if (len < 0)
232 return -EINVAL;
233 if (len) {
234 if (audit_sockaddr(klen, kaddr))
235 return -ENOMEM;
236 if (copy_to_user(uaddr, kaddr, len))
237 return -EFAULT;
238 }
239 /*
240 * "fromlen shall refer to the value before truncation.."
241 * 1003.1g
242 */
243 return __put_user(klen, ulen);
244}
245
246static struct kmem_cache *sock_inode_cachep __read_mostly;
247
248static struct inode *sock_alloc_inode(struct super_block *sb)
249{
250 struct socket_alloc *ei;
251 struct socket_wq *wq;
252
253 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
254 if (!ei)
255 return NULL;
256 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
257 if (!wq) {
258 kmem_cache_free(sock_inode_cachep, ei);
259 return NULL;
260 }
261 init_waitqueue_head(&wq->wait);
262 wq->fasync_list = NULL;
263 RCU_INIT_POINTER(ei->socket.wq, wq);
264
265 ei->socket.state = SS_UNCONNECTED;
266 ei->socket.flags = 0;
267 ei->socket.ops = NULL;
268 ei->socket.sk = NULL;
269 ei->socket.file = NULL;
270
271 return &ei->vfs_inode;
272}
273
274static void sock_destroy_inode(struct inode *inode)
275{
276 struct socket_alloc *ei;
277 struct socket_wq *wq;
278
279 ei = container_of(inode, struct socket_alloc, vfs_inode);
280 wq = rcu_dereference_protected(ei->socket.wq, 1);
281 kfree_rcu(wq, rcu);
282 kmem_cache_free(sock_inode_cachep, ei);
283}
284
285static void init_once(void *foo)
286{
287 struct socket_alloc *ei = (struct socket_alloc *)foo;
288
289 inode_init_once(&ei->vfs_inode);
290}
291
292static int init_inodecache(void)
293{
294 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
295 sizeof(struct socket_alloc),
296 0,
297 (SLAB_HWCACHE_ALIGN |
298 SLAB_RECLAIM_ACCOUNT |
299 SLAB_MEM_SPREAD),
300 init_once);
301 if (sock_inode_cachep == NULL)
302 return -ENOMEM;
303 return 0;
304}
305
306static const struct super_operations sockfs_ops = {
307 .alloc_inode = sock_alloc_inode,
308 .destroy_inode = sock_destroy_inode,
309 .statfs = simple_statfs,
310};
311
312/*
313 * sockfs_dname() is called from d_path().
314 */
315static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
316{
317 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
318 dentry->d_inode->i_ino);
319}
320
321static const struct dentry_operations sockfs_dentry_operations = {
322 .d_dname = sockfs_dname,
323};
324
325static struct dentry *sockfs_mount(struct file_system_type *fs_type,
326 int flags, const char *dev_name, void *data)
327{
328 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
329 &sockfs_dentry_operations, SOCKFS_MAGIC);
330}
331
332static struct vfsmount *sock_mnt __read_mostly;
333
334static struct file_system_type sock_fs_type = {
335 .name = "sockfs",
336 .mount = sockfs_mount,
337 .kill_sb = kill_anon_super,
338};
339
340/*
341 * Obtains the first available file descriptor and sets it up for use.
342 *
343 * These functions create file structures and maps them to fd space
344 * of the current process. On success it returns file descriptor
345 * and file struct implicitly stored in sock->file.
346 * Note that another thread may close file descriptor before we return
347 * from this function. We use the fact that now we do not refer
348 * to socket after mapping. If one day we will need it, this
349 * function will increment ref. count on file by 1.
350 *
351 * In any case returned fd MAY BE not valid!
352 * This race condition is unavoidable
353 * with shared fd spaces, we cannot solve it inside kernel,
354 * but we take care of internal coherence yet.
355 */
356
357struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
358{
359 struct qstr name = { .name = "" };
360 struct path path;
361 struct file *file;
362
363 if (dname) {
364 name.name = dname;
365 name.len = strlen(name.name);
366 } else if (sock->sk) {
367 name.name = sock->sk->sk_prot_creator->name;
368 name.len = strlen(name.name);
369 }
370 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
371 if (unlikely(!path.dentry))
372 return ERR_PTR(-ENOMEM);
373 path.mnt = mntget(sock_mnt);
374
375 d_instantiate(path.dentry, SOCK_INODE(sock));
376 SOCK_INODE(sock)->i_fop = &socket_file_ops;
377
378 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
379 &socket_file_ops);
380 if (unlikely(IS_ERR(file))) {
381 /* drop dentry, keep inode */
382 ihold(path.dentry->d_inode);
383 path_put(&path);
384 return file;
385 }
386
387 sock->file = file;
388 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
389 file->private_data = sock;
390 return file;
391}
392EXPORT_SYMBOL(sock_alloc_file);
393
394static int sock_map_fd(struct socket *sock, int flags)
395{
396 struct file *newfile;
397 int fd = get_unused_fd_flags(flags);
398 if (unlikely(fd < 0))
399 return fd;
400
401 newfile = sock_alloc_file(sock, flags, NULL);
402 if (likely(!IS_ERR(newfile))) {
403 fd_install(fd, newfile);
404 return fd;
405 }
406
407 put_unused_fd(fd);
408 return PTR_ERR(newfile);
409}
410
411struct socket *sock_from_file(struct file *file, int *err)
412{
413 if (file->f_op == &socket_file_ops)
414 return file->private_data; /* set in sock_map_fd */
415
416 *err = -ENOTSOCK;
417 return NULL;
418}
419EXPORT_SYMBOL(sock_from_file);
420
421/**
422 * sockfd_lookup - Go from a file number to its socket slot
423 * @fd: file handle
424 * @err: pointer to an error code return
425 *
426 * The file handle passed in is locked and the socket it is bound
427 * too is returned. If an error occurs the err pointer is overwritten
428 * with a negative errno code and NULL is returned. The function checks
429 * for both invalid handles and passing a handle which is not a socket.
430 *
431 * On a success the socket object pointer is returned.
432 */
433
434struct socket *sockfd_lookup(int fd, int *err)
435{
436 struct file *file;
437 struct socket *sock;
438
439 file = fget(fd);
440 if (!file) {
441 *err = -EBADF;
442 return NULL;
443 }
444
445 sock = sock_from_file(file, err);
446 if (!sock)
447 fput(file);
448 return sock;
449}
450EXPORT_SYMBOL(sockfd_lookup);
451
452static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
453{
454 struct fd f = fdget(fd);
455 struct socket *sock;
456
457 *err = -EBADF;
458 if (f.file) {
459 sock = sock_from_file(f.file, err);
460 if (likely(sock)) {
461 *fput_needed = f.flags;
462 return sock;
463 }
464 fdput(f);
465 }
466 return NULL;
467}
468
469#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
470#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
471#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
472static ssize_t sockfs_getxattr(struct dentry *dentry,
473 const char *name, void *value, size_t size)
474{
475 const char *proto_name;
476 size_t proto_size;
477 int error;
478
479 error = -ENODATA;
480 if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
481 proto_name = dentry->d_name.name;
482 proto_size = strlen(proto_name);
483
484 if (value) {
485 error = -ERANGE;
486 if (proto_size + 1 > size)
487 goto out;
488
489 strncpy(value, proto_name, proto_size + 1);
490 }
491 error = proto_size + 1;
492 }
493
494out:
495 return error;
496}
497
498static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
499 size_t size)
500{
501 ssize_t len;
502 ssize_t used = 0;
503
504 len = security_inode_listsecurity(dentry->d_inode, buffer, size);
505 if (len < 0)
506 return len;
507 used += len;
508 if (buffer) {
509 if (size < used)
510 return -ERANGE;
511 buffer += len;
512 }
513
514 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
515 used += len;
516 if (buffer) {
517 if (size < used)
518 return -ERANGE;
519 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
520 buffer += len;
521 }
522
523 return used;
524}
525
526static const struct inode_operations sockfs_inode_ops = {
527 .getxattr = sockfs_getxattr,
528 .listxattr = sockfs_listxattr,
529};
530
531/**
532 * sock_alloc - allocate a socket
533 *
534 * Allocate a new inode and socket object. The two are bound together
535 * and initialised. The socket is then returned. If we are out of inodes
536 * NULL is returned.
537 */
538
539static struct socket *sock_alloc(void)
540{
541 struct inode *inode;
542 struct socket *sock;
543
544 inode = new_inode_pseudo(sock_mnt->mnt_sb);
545 if (!inode)
546 return NULL;
547
548 sock = SOCKET_I(inode);
549
550 kmemcheck_annotate_bitfield(sock, type);
551 inode->i_ino = get_next_ino();
552 inode->i_mode = S_IFSOCK | S_IRWXUGO;
553 inode->i_uid = current_fsuid();
554 inode->i_gid = current_fsgid();
555 inode->i_op = &sockfs_inode_ops;
556
557 this_cpu_add(sockets_in_use, 1);
558 return sock;
559}
560
561/*
562 * In theory you can't get an open on this inode, but /proc provides
563 * a back door. Remember to keep it shut otherwise you'll let the
564 * creepy crawlies in.
565 */
566
567static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
568{
569 return -ENXIO;
570}
571
572const struct file_operations bad_sock_fops = {
573 .owner = THIS_MODULE,
574 .open = sock_no_open,
575 .llseek = noop_llseek,
576};
577
578/**
579 * sock_release - close a socket
580 * @sock: socket to close
581 *
582 * The socket is released from the protocol stack if it has a release
583 * callback, and the inode is then released if the socket is bound to
584 * an inode not a file.
585 */
586
587void sock_release(struct socket *sock)
588{
589 if (sock->ops) {
590 struct module *owner = sock->ops->owner;
591
592 sock->ops->release(sock);
593 sock->ops = NULL;
594 module_put(owner);
595 }
596
597 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
598 pr_err("%s: fasync list not empty!\n", __func__);
599
600 if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
601 return;
602
603 this_cpu_sub(sockets_in_use, 1);
604 if (!sock->file) {
605 iput(SOCK_INODE(sock));
606 return;
607 }
608 sock->file = NULL;
609}
610EXPORT_SYMBOL(sock_release);
611
612void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
613{
614 *tx_flags = 0;
615 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
616 *tx_flags |= SKBTX_HW_TSTAMP;
617 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
618 *tx_flags |= SKBTX_SW_TSTAMP;
619 if (sock_flag(sk, SOCK_WIFI_STATUS))
620 *tx_flags |= SKBTX_WIFI_STATUS;
621}
622EXPORT_SYMBOL(sock_tx_timestamp);
623
624static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
625 struct msghdr *msg, size_t size)
626{
627 struct sock_iocb *si = kiocb_to_siocb(iocb);
628
629 si->sock = sock;
630 si->scm = NULL;
631 si->msg = msg;
632 si->size = size;
633
634 return sock->ops->sendmsg(iocb, sock, msg, size);
635}
636
637static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
638 struct msghdr *msg, size_t size)
639{
640 int err = security_socket_sendmsg(sock, msg, size);
641
642 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
643}
644
645int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
646{
647 struct kiocb iocb;
648 struct sock_iocb siocb;
649 int ret;
650
651 init_sync_kiocb(&iocb, NULL);
652 iocb.private = &siocb;
653 ret = __sock_sendmsg(&iocb, sock, msg, size);
654 if (-EIOCBQUEUED == ret)
655 ret = wait_on_sync_kiocb(&iocb);
656 return ret;
657}
658EXPORT_SYMBOL(sock_sendmsg);
659
660static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
661{
662 struct kiocb iocb;
663 struct sock_iocb siocb;
664 int ret;
665
666 init_sync_kiocb(&iocb, NULL);
667 iocb.private = &siocb;
668 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
669 if (-EIOCBQUEUED == ret)
670 ret = wait_on_sync_kiocb(&iocb);
671 return ret;
672}
673
674int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
675 struct kvec *vec, size_t num, size_t size)
676{
677 mm_segment_t oldfs = get_fs();
678 int result;
679
680 set_fs(KERNEL_DS);
681 /*
682 * the following is safe, since for compiler definitions of kvec and
683 * iovec are identical, yielding the same in-core layout and alignment
684 */
685 msg->msg_iov = (struct iovec *)vec;
686 msg->msg_iovlen = num;
687 result = sock_sendmsg(sock, msg, size);
688 set_fs(oldfs);
689 return result;
690}
691EXPORT_SYMBOL(kernel_sendmsg);
692
693/*
694 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
695 */
696void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
697 struct sk_buff *skb)
698{
699 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
700 struct timespec ts[3];
701 int empty = 1;
702 struct skb_shared_hwtstamps *shhwtstamps =
703 skb_hwtstamps(skb);
704
705 /* Race occurred between timestamp enabling and packet
706 receiving. Fill in the current time for now. */
707 if (need_software_tstamp && skb->tstamp.tv64 == 0)
708 __net_timestamp(skb);
709
710 if (need_software_tstamp) {
711 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
712 struct timeval tv;
713 skb_get_timestamp(skb, &tv);
714 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
715 sizeof(tv), &tv);
716 } else {
717 skb_get_timestampns(skb, &ts[0]);
718 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
719 sizeof(ts[0]), &ts[0]);
720 }
721 }
722
723
724 memset(ts, 0, sizeof(ts));
725 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
726 ktime_to_timespec_cond(skb->tstamp, ts + 0))
727 empty = 0;
728 if (shhwtstamps) {
729 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
730 ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1))
731 empty = 0;
732 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
733 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
734 empty = 0;
735 }
736 if (!empty)
737 put_cmsg(msg, SOL_SOCKET,
738 SCM_TIMESTAMPING, sizeof(ts), &ts);
739}
740EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
741
742void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
743 struct sk_buff *skb)
744{
745 int ack;
746
747 if (!sock_flag(sk, SOCK_WIFI_STATUS))
748 return;
749 if (!skb->wifi_acked_valid)
750 return;
751
752 ack = skb->wifi_acked;
753
754 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
755}
756EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
757
758static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
759 struct sk_buff *skb)
760{
761 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
762 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
763 sizeof(__u32), &skb->dropcount);
764}
765
766void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
767 struct sk_buff *skb)
768{
769 sock_recv_timestamp(msg, sk, skb);
770 sock_recv_drops(msg, sk, skb);
771}
772EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
773
774static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
775 struct msghdr *msg, size_t size, int flags)
776{
777 struct sock_iocb *si = kiocb_to_siocb(iocb);
778
779 si->sock = sock;
780 si->scm = NULL;
781 si->msg = msg;
782 si->size = size;
783 si->flags = flags;
784
785 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
786}
787
788static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
789 struct msghdr *msg, size_t size, int flags)
790{
791 int err = security_socket_recvmsg(sock, msg, size, flags);
792
793 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
794}
795
796int sock_recvmsg(struct socket *sock, struct msghdr *msg,
797 size_t size, int flags)
798{
799 struct kiocb iocb;
800 struct sock_iocb siocb;
801 int ret;
802
803 init_sync_kiocb(&iocb, NULL);
804 iocb.private = &siocb;
805 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
806 if (-EIOCBQUEUED == ret)
807 ret = wait_on_sync_kiocb(&iocb);
808 return ret;
809}
810EXPORT_SYMBOL(sock_recvmsg);
811
812static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
813 size_t size, int flags)
814{
815 struct kiocb iocb;
816 struct sock_iocb siocb;
817 int ret;
818
819 init_sync_kiocb(&iocb, NULL);
820 iocb.private = &siocb;
821 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
822 if (-EIOCBQUEUED == ret)
823 ret = wait_on_sync_kiocb(&iocb);
824 return ret;
825}
826
827/**
828 * kernel_recvmsg - Receive a message from a socket (kernel space)
829 * @sock: The socket to receive the message from
830 * @msg: Received message
831 * @vec: Input s/g array for message data
832 * @num: Size of input s/g array
833 * @size: Number of bytes to read
834 * @flags: Message flags (MSG_DONTWAIT, etc...)
835 *
836 * On return the msg structure contains the scatter/gather array passed in the
837 * vec argument. The array is modified so that it consists of the unfilled
838 * portion of the original array.
839 *
840 * The returned value is the total number of bytes received, or an error.
841 */
842int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
843 struct kvec *vec, size_t num, size_t size, int flags)
844{
845 mm_segment_t oldfs = get_fs();
846 int result;
847
848 set_fs(KERNEL_DS);
849 /*
850 * the following is safe, since for compiler definitions of kvec and
851 * iovec are identical, yielding the same in-core layout and alignment
852 */
853 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
854 result = sock_recvmsg(sock, msg, size, flags);
855 set_fs(oldfs);
856 return result;
857}
858EXPORT_SYMBOL(kernel_recvmsg);
859
860static ssize_t sock_sendpage(struct file *file, struct page *page,
861 int offset, size_t size, loff_t *ppos, int more)
862{
863 struct socket *sock;
864 int flags;
865
866 sock = file->private_data;
867
868 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
869 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
870 flags |= more;
871
872 return kernel_sendpage(sock, page, offset, size, flags);
873}
874
875static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
876 struct pipe_inode_info *pipe, size_t len,
877 unsigned int flags)
878{
879 struct socket *sock = file->private_data;
880
881 if (unlikely(!sock->ops->splice_read))
882 return -EINVAL;
883
884 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
885}
886
887static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
888 struct sock_iocb *siocb)
889{
890 if (!is_sync_kiocb(iocb))
891 BUG();
892
893 siocb->kiocb = iocb;
894 iocb->private = siocb;
895 return siocb;
896}
897
898static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
899 struct file *file, const struct iovec *iov,
900 unsigned long nr_segs)
901{
902 struct socket *sock = file->private_data;
903 size_t size = 0;
904 int i;
905
906 for (i = 0; i < nr_segs; i++)
907 size += iov[i].iov_len;
908
909 msg->msg_name = NULL;
910 msg->msg_namelen = 0;
911 msg->msg_control = NULL;
912 msg->msg_controllen = 0;
913 msg->msg_iov = (struct iovec *)iov;
914 msg->msg_iovlen = nr_segs;
915 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
916
917 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
918}
919
920static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
921 unsigned long nr_segs, loff_t pos)
922{
923 struct sock_iocb siocb, *x;
924
925 if (pos != 0)
926 return -ESPIPE;
927
928 if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
929 return 0;
930
931
932 x = alloc_sock_iocb(iocb, &siocb);
933 if (!x)
934 return -ENOMEM;
935 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
936}
937
938static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
939 struct file *file, const struct iovec *iov,
940 unsigned long nr_segs)
941{
942 struct socket *sock = file->private_data;
943 size_t size = 0;
944 int i;
945
946 for (i = 0; i < nr_segs; i++)
947 size += iov[i].iov_len;
948
949 msg->msg_name = NULL;
950 msg->msg_namelen = 0;
951 msg->msg_control = NULL;
952 msg->msg_controllen = 0;
953 msg->msg_iov = (struct iovec *)iov;
954 msg->msg_iovlen = nr_segs;
955 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
956 if (sock->type == SOCK_SEQPACKET)
957 msg->msg_flags |= MSG_EOR;
958
959 return __sock_sendmsg(iocb, sock, msg, size);
960}
961
962static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
963 unsigned long nr_segs, loff_t pos)
964{
965 struct sock_iocb siocb, *x;
966
967 if (pos != 0)
968 return -ESPIPE;
969
970 x = alloc_sock_iocb(iocb, &siocb);
971 if (!x)
972 return -ENOMEM;
973
974 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
975}
976
977/*
978 * Atomic setting of ioctl hooks to avoid race
979 * with module unload.
980 */
981
982static DEFINE_MUTEX(br_ioctl_mutex);
983static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
984
985void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
986{
987 mutex_lock(&br_ioctl_mutex);
988 br_ioctl_hook = hook;
989 mutex_unlock(&br_ioctl_mutex);
990}
991EXPORT_SYMBOL(brioctl_set);
992
993static DEFINE_MUTEX(vlan_ioctl_mutex);
994static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
995
996void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
997{
998 mutex_lock(&vlan_ioctl_mutex);
999 vlan_ioctl_hook = hook;
1000 mutex_unlock(&vlan_ioctl_mutex);
1001}
1002EXPORT_SYMBOL(vlan_ioctl_set);
1003
1004static DEFINE_MUTEX(dlci_ioctl_mutex);
1005static int (*dlci_ioctl_hook) (unsigned int, void __user *);
1006
1007void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
1008{
1009 mutex_lock(&dlci_ioctl_mutex);
1010 dlci_ioctl_hook = hook;
1011 mutex_unlock(&dlci_ioctl_mutex);
1012}
1013EXPORT_SYMBOL(dlci_ioctl_set);
1014
1015static long sock_do_ioctl(struct net *net, struct socket *sock,
1016 unsigned int cmd, unsigned long arg)
1017{
1018 int err;
1019 void __user *argp = (void __user *)arg;
1020
1021 err = sock->ops->ioctl(sock, cmd, arg);
1022
1023 /*
1024 * If this ioctl is unknown try to hand it down
1025 * to the NIC driver.
1026 */
1027 if (err == -ENOIOCTLCMD)
1028 err = dev_ioctl(net, cmd, argp);
1029
1030 return err;
1031}
1032
1033/*
1034 * With an ioctl, arg may well be a user mode pointer, but we don't know
1035 * what to do with it - that's up to the protocol still.
1036 */
1037
1038static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1039{
1040 struct socket *sock;
1041 struct sock *sk;
1042 void __user *argp = (void __user *)arg;
1043 int pid, err;
1044 struct net *net;
1045
1046 sock = file->private_data;
1047 sk = sock->sk;
1048 net = sock_net(sk);
1049 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
1050 err = dev_ioctl(net, cmd, argp);
1051 } else
1052#ifdef CONFIG_WEXT_CORE
1053 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1054 err = dev_ioctl(net, cmd, argp);
1055 } else
1056#endif
1057 switch (cmd) {
1058 case FIOSETOWN:
1059 case SIOCSPGRP:
1060 err = -EFAULT;
1061 if (get_user(pid, (int __user *)argp))
1062 break;
1063 err = f_setown(sock->file, pid, 1);
1064 break;
1065 case FIOGETOWN:
1066 case SIOCGPGRP:
1067 err = put_user(f_getown(sock->file),
1068 (int __user *)argp);
1069 break;
1070 case SIOCGIFBR:
1071 case SIOCSIFBR:
1072 case SIOCBRADDBR:
1073 case SIOCBRDELBR:
1074 err = -ENOPKG;
1075 if (!br_ioctl_hook)
1076 request_module("bridge");
1077
1078 mutex_lock(&br_ioctl_mutex);
1079 if (br_ioctl_hook)
1080 err = br_ioctl_hook(net, cmd, argp);
1081 mutex_unlock(&br_ioctl_mutex);
1082 break;
1083 case SIOCGIFVLAN:
1084 case SIOCSIFVLAN:
1085 err = -ENOPKG;
1086 if (!vlan_ioctl_hook)
1087 request_module("8021q");
1088
1089 mutex_lock(&vlan_ioctl_mutex);
1090 if (vlan_ioctl_hook)
1091 err = vlan_ioctl_hook(net, argp);
1092 mutex_unlock(&vlan_ioctl_mutex);
1093 break;
1094 case SIOCADDDLCI:
1095 case SIOCDELDLCI:
1096 err = -ENOPKG;
1097 if (!dlci_ioctl_hook)
1098 request_module("dlci");
1099
1100 mutex_lock(&dlci_ioctl_mutex);
1101 if (dlci_ioctl_hook)
1102 err = dlci_ioctl_hook(cmd, argp);
1103 mutex_unlock(&dlci_ioctl_mutex);
1104 break;
1105 default:
1106 err = sock_do_ioctl(net, sock, cmd, arg);
1107 break;
1108 }
1109 return err;
1110}
1111
1112int sock_create_lite(int family, int type, int protocol, struct socket **res)
1113{
1114 int err;
1115 struct socket *sock = NULL;
1116
1117 err = security_socket_create(family, type, protocol, 1);
1118 if (err)
1119 goto out;
1120
1121 sock = sock_alloc();
1122 if (!sock) {
1123 err = -ENOMEM;
1124 goto out;
1125 }
1126
1127 sock->type = type;
1128 err = security_socket_post_create(sock, family, type, protocol, 1);
1129 if (err)
1130 goto out_release;
1131
1132out:
1133 *res = sock;
1134 return err;
1135out_release:
1136 sock_release(sock);
1137 sock = NULL;
1138 goto out;
1139}
1140EXPORT_SYMBOL(sock_create_lite);
1141
1142/* No kernel lock held - perfect */
1143static unsigned int sock_poll(struct file *file, poll_table *wait)
1144{
1145 unsigned int busy_flag = 0;
1146 struct socket *sock;
1147
1148 /*
1149 * We can't return errors to poll, so it's either yes or no.
1150 */
1151 sock = file->private_data;
1152
1153 if (sk_can_busy_loop(sock->sk)) {
1154 /* this socket can poll_ll so tell the system call */
1155 busy_flag = POLL_BUSY_LOOP;
1156
1157 /* once, only if requested by syscall */
1158 if (wait && (wait->_key & POLL_BUSY_LOOP))
1159 sk_busy_loop(sock->sk, 1);
1160 }
1161
1162 return busy_flag | sock->ops->poll(file, sock, wait);
1163}
1164
1165static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1166{
1167 struct socket *sock = file->private_data;
1168
1169 return sock->ops->mmap(file, sock, vma);
1170}
1171
1172static int sock_close(struct inode *inode, struct file *filp)
1173{
1174 sock_release(SOCKET_I(inode));
1175 return 0;
1176}
1177
1178/*
1179 * Update the socket async list
1180 *
1181 * Fasync_list locking strategy.
1182 *
1183 * 1. fasync_list is modified only under process context socket lock
1184 * i.e. under semaphore.
1185 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1186 * or under socket lock
1187 */
1188
1189static int sock_fasync(int fd, struct file *filp, int on)
1190{
1191 struct socket *sock = filp->private_data;
1192 struct sock *sk = sock->sk;
1193 struct socket_wq *wq;
1194
1195 if (sk == NULL)
1196 return -EINVAL;
1197
1198 lock_sock(sk);
1199 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1200 fasync_helper(fd, filp, on, &wq->fasync_list);
1201
1202 if (!wq->fasync_list)
1203 sock_reset_flag(sk, SOCK_FASYNC);
1204 else
1205 sock_set_flag(sk, SOCK_FASYNC);
1206
1207 release_sock(sk);
1208 return 0;
1209}
1210
1211/* This function may be called only under socket lock or callback_lock or rcu_lock */
1212
1213int sock_wake_async(struct socket *sock, int how, int band)
1214{
1215 struct socket_wq *wq;
1216
1217 if (!sock)
1218 return -1;
1219 rcu_read_lock();
1220 wq = rcu_dereference(sock->wq);
1221 if (!wq || !wq->fasync_list) {
1222 rcu_read_unlock();
1223 return -1;
1224 }
1225 switch (how) {
1226 case SOCK_WAKE_WAITD:
1227 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1228 break;
1229 goto call_kill;
1230 case SOCK_WAKE_SPACE:
1231 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1232 break;
1233 /* fall through */
1234 case SOCK_WAKE_IO:
1235call_kill:
1236 kill_fasync(&wq->fasync_list, SIGIO, band);
1237 break;
1238 case SOCK_WAKE_URG:
1239 kill_fasync(&wq->fasync_list, SIGURG, band);
1240 }
1241 rcu_read_unlock();
1242 return 0;
1243}
1244EXPORT_SYMBOL(sock_wake_async);
1245
1246int __sock_create(struct net *net, int family, int type, int protocol,
1247 struct socket **res, int kern)
1248{
1249 int err;
1250 struct socket *sock;
1251 const struct net_proto_family *pf;
1252
1253 /*
1254 * Check protocol is in range
1255 */
1256 if (family < 0 || family >= NPROTO)
1257 return -EAFNOSUPPORT;
1258 if (type < 0 || type >= SOCK_MAX)
1259 return -EINVAL;
1260
1261 /* Compatibility.
1262
1263 This uglymoron is moved from INET layer to here to avoid
1264 deadlock in module load.
1265 */
1266 if (family == PF_INET && type == SOCK_PACKET) {
1267 static int warned;
1268 if (!warned) {
1269 warned = 1;
1270 pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1271 current->comm);
1272 }
1273 family = PF_PACKET;
1274 }
1275
1276 err = security_socket_create(family, type, protocol, kern);
1277 if (err)
1278 return err;
1279
1280 /*
1281 * Allocate the socket and allow the family to set things up. if
1282 * the protocol is 0, the family is instructed to select an appropriate
1283 * default.
1284 */
1285 sock = sock_alloc();
1286 if (!sock) {
1287 net_warn_ratelimited("socket: no more sockets\n");
1288 return -ENFILE; /* Not exactly a match, but its the
1289 closest posix thing */
1290 }
1291
1292 sock->type = type;
1293
1294#ifdef CONFIG_MODULES
1295 /* Attempt to load a protocol module if the find failed.
1296 *
1297 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1298 * requested real, full-featured networking support upon configuration.
1299 * Otherwise module support will break!
1300 */
1301 if (rcu_access_pointer(net_families[family]) == NULL)
1302 request_module("net-pf-%d", family);
1303#endif
1304
1305 rcu_read_lock();
1306 pf = rcu_dereference(net_families[family]);
1307 err = -EAFNOSUPPORT;
1308 if (!pf)
1309 goto out_release;
1310
1311 /*
1312 * We will call the ->create function, that possibly is in a loadable
1313 * module, so we have to bump that loadable module refcnt first.
1314 */
1315 if (!try_module_get(pf->owner))
1316 goto out_release;
1317
1318 /* Now protected by module ref count */
1319 rcu_read_unlock();
1320
1321 err = pf->create(net, sock, protocol, kern);
1322 if (err < 0)
1323 goto out_module_put;
1324
1325 /*
1326 * Now to bump the refcnt of the [loadable] module that owns this
1327 * socket at sock_release time we decrement its refcnt.
1328 */
1329 if (!try_module_get(sock->ops->owner))
1330 goto out_module_busy;
1331
1332 /*
1333 * Now that we're done with the ->create function, the [loadable]
1334 * module can have its refcnt decremented
1335 */
1336 module_put(pf->owner);
1337 err = security_socket_post_create(sock, family, type, protocol, kern);
1338 if (err)
1339 goto out_sock_release;
1340 *res = sock;
1341
1342 return 0;
1343
1344out_module_busy:
1345 err = -EAFNOSUPPORT;
1346out_module_put:
1347 sock->ops = NULL;
1348 module_put(pf->owner);
1349out_sock_release:
1350 sock_release(sock);
1351 return err;
1352
1353out_release:
1354 rcu_read_unlock();
1355 goto out_sock_release;
1356}
1357EXPORT_SYMBOL(__sock_create);
1358
1359int sock_create(int family, int type, int protocol, struct socket **res)
1360{
1361 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1362}
1363EXPORT_SYMBOL(sock_create);
1364
1365int sock_create_kern(int family, int type, int protocol, struct socket **res)
1366{
1367 return __sock_create(&init_net, family, type, protocol, res, 1);
1368}
1369EXPORT_SYMBOL(sock_create_kern);
1370
1371SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1372{
1373 int retval;
1374 struct socket *sock;
1375 int flags;
1376
1377 /* Check the SOCK_* constants for consistency. */
1378 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1379 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1380 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1381 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1382
1383 flags = type & ~SOCK_TYPE_MASK;
1384 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1385 return -EINVAL;
1386 type &= SOCK_TYPE_MASK;
1387
1388 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1389 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1390
1391 retval = sock_create(family, type, protocol, &sock);
1392 if (retval < 0)
1393 goto out;
1394
1395 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
1396 if (retval < 0)
1397 goto out_release;
1398
1399out:
1400 /* It may be already another descriptor 8) Not kernel problem. */
1401 return retval;
1402
1403out_release:
1404 sock_release(sock);
1405 return retval;
1406}
1407
1408/*
1409 * Create a pair of connected sockets.
1410 */
1411
1412SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1413 int __user *, usockvec)
1414{
1415 struct socket *sock1, *sock2;
1416 int fd1, fd2, err;
1417 struct file *newfile1, *newfile2;
1418 int flags;
1419
1420 flags = type & ~SOCK_TYPE_MASK;
1421 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1422 return -EINVAL;
1423 type &= SOCK_TYPE_MASK;
1424
1425 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1426 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1427
1428 /*
1429 * Obtain the first socket and check if the underlying protocol
1430 * supports the socketpair call.
1431 */
1432
1433 err = sock_create(family, type, protocol, &sock1);
1434 if (err < 0)
1435 goto out;
1436
1437 err = sock_create(family, type, protocol, &sock2);
1438 if (err < 0)
1439 goto out_release_1;
1440
1441 err = sock1->ops->socketpair(sock1, sock2);
1442 if (err < 0)
1443 goto out_release_both;
1444
1445 fd1 = get_unused_fd_flags(flags);
1446 if (unlikely(fd1 < 0)) {
1447 err = fd1;
1448 goto out_release_both;
1449 }
1450
1451 fd2 = get_unused_fd_flags(flags);
1452 if (unlikely(fd2 < 0)) {
1453 err = fd2;
1454 goto out_put_unused_1;
1455 }
1456
1457 newfile1 = sock_alloc_file(sock1, flags, NULL);
1458 if (unlikely(IS_ERR(newfile1))) {
1459 err = PTR_ERR(newfile1);
1460 goto out_put_unused_both;
1461 }
1462
1463 newfile2 = sock_alloc_file(sock2, flags, NULL);
1464 if (IS_ERR(newfile2)) {
1465 err = PTR_ERR(newfile2);
1466 goto out_fput_1;
1467 }
1468
1469 err = put_user(fd1, &usockvec[0]);
1470 if (err)
1471 goto out_fput_both;
1472
1473 err = put_user(fd2, &usockvec[1]);
1474 if (err)
1475 goto out_fput_both;
1476
1477 audit_fd_pair(fd1, fd2);
1478
1479 fd_install(fd1, newfile1);
1480 fd_install(fd2, newfile2);
1481 /* fd1 and fd2 may be already another descriptors.
1482 * Not kernel problem.
1483 */
1484
1485 return 0;
1486
1487out_fput_both:
1488 fput(newfile2);
1489 fput(newfile1);
1490 put_unused_fd(fd2);
1491 put_unused_fd(fd1);
1492 goto out;
1493
1494out_fput_1:
1495 fput(newfile1);
1496 put_unused_fd(fd2);
1497 put_unused_fd(fd1);
1498 sock_release(sock2);
1499 goto out;
1500
1501out_put_unused_both:
1502 put_unused_fd(fd2);
1503out_put_unused_1:
1504 put_unused_fd(fd1);
1505out_release_both:
1506 sock_release(sock2);
1507out_release_1:
1508 sock_release(sock1);
1509out:
1510 return err;
1511}
1512
1513/*
1514 * Bind a name to a socket. Nothing much to do here since it's
1515 * the protocol's responsibility to handle the local address.
1516 *
1517 * We move the socket address to kernel space before we call
1518 * the protocol layer (having also checked the address is ok).
1519 */
1520
1521SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1522{
1523 struct socket *sock;
1524 struct sockaddr_storage address;
1525 int err, fput_needed;
1526
1527 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1528 if (sock) {
1529 err = move_addr_to_kernel(umyaddr, addrlen, &address);
1530 if (err >= 0) {
1531 err = security_socket_bind(sock,
1532 (struct sockaddr *)&address,
1533 addrlen);
1534 if (!err)
1535 err = sock->ops->bind(sock,
1536 (struct sockaddr *)
1537 &address, addrlen);
1538 }
1539 fput_light(sock->file, fput_needed);
1540 }
1541 return err;
1542}
1543
1544/*
1545 * Perform a listen. Basically, we allow the protocol to do anything
1546 * necessary for a listen, and if that works, we mark the socket as
1547 * ready for listening.
1548 */
1549
1550SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1551{
1552 struct socket *sock;
1553 int err, fput_needed;
1554 int somaxconn;
1555
1556 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1557 if (sock) {
1558 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1559 if ((unsigned int)backlog > somaxconn)
1560 backlog = somaxconn;
1561
1562 err = security_socket_listen(sock, backlog);
1563 if (!err)
1564 err = sock->ops->listen(sock, backlog);
1565
1566 fput_light(sock->file, fput_needed);
1567 }
1568 return err;
1569}
1570
1571/*
1572 * For accept, we attempt to create a new socket, set up the link
1573 * with the client, wake up the client, then return the new
1574 * connected fd. We collect the address of the connector in kernel
1575 * space and move it to user at the very end. This is unclean because
1576 * we open the socket then return an error.
1577 *
1578 * 1003.1g adds the ability to recvmsg() to query connection pending
1579 * status to recvmsg. We need to add that support in a way thats
1580 * clean when we restucture accept also.
1581 */
1582
1583SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1584 int __user *, upeer_addrlen, int, flags)
1585{
1586 struct socket *sock, *newsock;
1587 struct file *newfile;
1588 int err, len, newfd, fput_needed;
1589 struct sockaddr_storage address;
1590
1591 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1592 return -EINVAL;
1593
1594 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1595 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1596
1597 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1598 if (!sock)
1599 goto out;
1600
1601 err = -ENFILE;
1602 newsock = sock_alloc();
1603 if (!newsock)
1604 goto out_put;
1605
1606 newsock->type = sock->type;
1607 newsock->ops = sock->ops;
1608
1609 /*
1610 * We don't need try_module_get here, as the listening socket (sock)
1611 * has the protocol module (sock->ops->owner) held.
1612 */
1613 __module_get(newsock->ops->owner);
1614
1615 newfd = get_unused_fd_flags(flags);
1616 if (unlikely(newfd < 0)) {
1617 err = newfd;
1618 sock_release(newsock);
1619 goto out_put;
1620 }
1621 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1622 if (unlikely(IS_ERR(newfile))) {
1623 err = PTR_ERR(newfile);
1624 put_unused_fd(newfd);
1625 sock_release(newsock);
1626 goto out_put;
1627 }
1628
1629 err = security_socket_accept(sock, newsock);
1630 if (err)
1631 goto out_fd;
1632
1633 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1634 if (err < 0)
1635 goto out_fd;
1636
1637 if (upeer_sockaddr) {
1638 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1639 &len, 2) < 0) {
1640 err = -ECONNABORTED;
1641 goto out_fd;
1642 }
1643 err = move_addr_to_user(&address,
1644 len, upeer_sockaddr, upeer_addrlen);
1645 if (err < 0)
1646 goto out_fd;
1647 }
1648
1649 /* File flags are not inherited via accept() unlike another OSes. */
1650
1651 fd_install(newfd, newfile);
1652 err = newfd;
1653
1654out_put:
1655 fput_light(sock->file, fput_needed);
1656out:
1657 return err;
1658out_fd:
1659 fput(newfile);
1660 put_unused_fd(newfd);
1661 goto out_put;
1662}
1663
1664SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1665 int __user *, upeer_addrlen)
1666{
1667 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1668}
1669
1670/*
1671 * Attempt to connect to a socket with the server address. The address
1672 * is in user space so we verify it is OK and move it to kernel space.
1673 *
1674 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1675 * break bindings
1676 *
1677 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1678 * other SEQPACKET protocols that take time to connect() as it doesn't
1679 * include the -EINPROGRESS status for such sockets.
1680 */
1681
1682SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1683 int, addrlen)
1684{
1685 struct socket *sock;
1686 struct sockaddr_storage address;
1687 int err, fput_needed;
1688
1689 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1690 if (!sock)
1691 goto out;
1692 err = move_addr_to_kernel(uservaddr, addrlen, &address);
1693 if (err < 0)
1694 goto out_put;
1695
1696 err =
1697 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1698 if (err)
1699 goto out_put;
1700
1701 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1702 sock->file->f_flags);
1703out_put:
1704 fput_light(sock->file, fput_needed);
1705out:
1706 return err;
1707}
1708
1709/*
1710 * Get the local address ('name') of a socket object. Move the obtained
1711 * name to user space.
1712 */
1713
1714SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1715 int __user *, usockaddr_len)
1716{
1717 struct socket *sock;
1718 struct sockaddr_storage address;
1719 int len, err, fput_needed;
1720
1721 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1722 if (!sock)
1723 goto out;
1724
1725 err = security_socket_getsockname(sock);
1726 if (err)
1727 goto out_put;
1728
1729 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1730 if (err)
1731 goto out_put;
1732 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
1733
1734out_put:
1735 fput_light(sock->file, fput_needed);
1736out:
1737 return err;
1738}
1739
1740/*
1741 * Get the remote address ('name') of a socket object. Move the obtained
1742 * name to user space.
1743 */
1744
1745SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1746 int __user *, usockaddr_len)
1747{
1748 struct socket *sock;
1749 struct sockaddr_storage address;
1750 int len, err, fput_needed;
1751
1752 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1753 if (sock != NULL) {
1754 err = security_socket_getpeername(sock);
1755 if (err) {
1756 fput_light(sock->file, fput_needed);
1757 return err;
1758 }
1759
1760 err =
1761 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1762 1);
1763 if (!err)
1764 err = move_addr_to_user(&address, len, usockaddr,
1765 usockaddr_len);
1766 fput_light(sock->file, fput_needed);
1767 }
1768 return err;
1769}
1770
1771/*
1772 * Send a datagram to a given address. We move the address into kernel
1773 * space and check the user space data area is readable before invoking
1774 * the protocol.
1775 */
1776
1777SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1778 unsigned int, flags, struct sockaddr __user *, addr,
1779 int, addr_len)
1780{
1781 struct socket *sock;
1782 struct sockaddr_storage address;
1783 int err;
1784 struct msghdr msg;
1785 struct iovec iov;
1786 int fput_needed;
1787
1788 if (len > INT_MAX)
1789 len = INT_MAX;
1790 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1791 if (!sock)
1792 goto out;
1793
1794 iov.iov_base = buff;
1795 iov.iov_len = len;
1796 msg.msg_name = NULL;
1797 msg.msg_iov = &iov;
1798 msg.msg_iovlen = 1;
1799 msg.msg_control = NULL;
1800 msg.msg_controllen = 0;
1801 msg.msg_namelen = 0;
1802 if (addr) {
1803 err = move_addr_to_kernel(addr, addr_len, &address);
1804 if (err < 0)
1805 goto out_put;
1806 msg.msg_name = (struct sockaddr *)&address;
1807 msg.msg_namelen = addr_len;
1808 }
1809 if (sock->file->f_flags & O_NONBLOCK)
1810 flags |= MSG_DONTWAIT;
1811 msg.msg_flags = flags;
1812 err = sock_sendmsg(sock, &msg, len);
1813
1814out_put:
1815 fput_light(sock->file, fput_needed);
1816out:
1817 return err;
1818}
1819
1820/*
1821 * Send a datagram down a socket.
1822 */
1823
1824SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1825 unsigned int, flags)
1826{
1827 return sys_sendto(fd, buff, len, flags, NULL, 0);
1828}
1829
1830/*
1831 * Receive a frame from the socket and optionally record the address of the
1832 * sender. We verify the buffers are writable and if needed move the
1833 * sender address from kernel to user space.
1834 */
1835
1836SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1837 unsigned int, flags, struct sockaddr __user *, addr,
1838 int __user *, addr_len)
1839{
1840 struct socket *sock;
1841 struct iovec iov;
1842 struct msghdr msg;
1843 struct sockaddr_storage address;
1844 int err, err2;
1845 int fput_needed;
1846
1847 if (size > INT_MAX)
1848 size = INT_MAX;
1849 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1850 if (!sock)
1851 goto out;
1852
1853 msg.msg_control = NULL;
1854 msg.msg_controllen = 0;
1855 msg.msg_iovlen = 1;
1856 msg.msg_iov = &iov;
1857 iov.iov_len = size;
1858 iov.iov_base = ubuf;
1859 /* Save some cycles and don't copy the address if not needed */
1860 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1861 /* We assume all kernel code knows the size of sockaddr_storage */
1862 msg.msg_namelen = 0;
1863 if (sock->file->f_flags & O_NONBLOCK)
1864 flags |= MSG_DONTWAIT;
1865 err = sock_recvmsg(sock, &msg, size, flags);
1866
1867 if (err >= 0 && addr != NULL) {
1868 err2 = move_addr_to_user(&address,
1869 msg.msg_namelen, addr, addr_len);
1870 if (err2 < 0)
1871 err = err2;
1872 }
1873
1874 fput_light(sock->file, fput_needed);
1875out:
1876 return err;
1877}
1878
1879/*
1880 * Receive a datagram from a socket.
1881 */
1882
1883SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1884 unsigned int, flags)
1885{
1886 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1887}
1888
1889/*
1890 * Set a socket option. Because we don't know the option lengths we have
1891 * to pass the user mode parameter for the protocols to sort out.
1892 */
1893
1894SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1895 char __user *, optval, int, optlen)
1896{
1897 int err, fput_needed;
1898 struct socket *sock;
1899
1900 if (optlen < 0)
1901 return -EINVAL;
1902
1903 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1904 if (sock != NULL) {
1905 err = security_socket_setsockopt(sock, level, optname);
1906 if (err)
1907 goto out_put;
1908
1909 if (level == SOL_SOCKET)
1910 err =
1911 sock_setsockopt(sock, level, optname, optval,
1912 optlen);
1913 else
1914 err =
1915 sock->ops->setsockopt(sock, level, optname, optval,
1916 optlen);
1917out_put:
1918 fput_light(sock->file, fput_needed);
1919 }
1920 return err;
1921}
1922
1923/*
1924 * Get a socket option. Because we don't know the option lengths we have
1925 * to pass a user mode parameter for the protocols to sort out.
1926 */
1927
1928SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1929 char __user *, optval, int __user *, optlen)
1930{
1931 int err, fput_needed;
1932 struct socket *sock;
1933
1934 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1935 if (sock != NULL) {
1936 err = security_socket_getsockopt(sock, level, optname);
1937 if (err)
1938 goto out_put;
1939
1940 if (level == SOL_SOCKET)
1941 err =
1942 sock_getsockopt(sock, level, optname, optval,
1943 optlen);
1944 else
1945 err =
1946 sock->ops->getsockopt(sock, level, optname, optval,
1947 optlen);
1948out_put:
1949 fput_light(sock->file, fput_needed);
1950 }
1951 return err;
1952}
1953
1954/*
1955 * Shutdown a socket.
1956 */
1957
1958SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1959{
1960 int err, fput_needed;
1961 struct socket *sock;
1962
1963 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1964 if (sock != NULL) {
1965 err = security_socket_shutdown(sock, how);
1966 if (!err)
1967 err = sock->ops->shutdown(sock, how);
1968 fput_light(sock->file, fput_needed);
1969 }
1970 return err;
1971}
1972
1973/* A couple of helpful macros for getting the address of the 32/64 bit
1974 * fields which are the same type (int / unsigned) on our platforms.
1975 */
1976#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1977#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1978#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1979
1980struct used_address {
1981 struct sockaddr_storage name;
1982 unsigned int name_len;
1983};
1984
1985static int copy_msghdr_from_user(struct msghdr *kmsg,
1986 struct msghdr __user *umsg)
1987{
1988 if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
1989 return -EFAULT;
1990
1991 if (kmsg->msg_namelen < 0)
1992 return -EINVAL;
1993
1994 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
1995 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
1996 return 0;
1997}
1998
1999static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
2000 struct msghdr *msg_sys, unsigned int flags,
2001 struct used_address *used_address)
2002{
2003 struct compat_msghdr __user *msg_compat =
2004 (struct compat_msghdr __user *)msg;
2005 struct sockaddr_storage address;
2006 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2007 unsigned char ctl[sizeof(struct cmsghdr) + 20]
2008 __attribute__ ((aligned(sizeof(__kernel_size_t))));
2009 /* 20 is size of ipv6_pktinfo */
2010 unsigned char *ctl_buf = ctl;
2011 int err, ctl_len, total_len;
2012
2013 err = -EFAULT;
2014 if (MSG_CMSG_COMPAT & flags) {
2015 if (get_compat_msghdr(msg_sys, msg_compat))
2016 return -EFAULT;
2017 } else {
2018 err = copy_msghdr_from_user(msg_sys, msg);
2019 if (err)
2020 return err;
2021 }
2022
2023 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2024 err = -EMSGSIZE;
2025 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2026 goto out;
2027 err = -ENOMEM;
2028 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2029 GFP_KERNEL);
2030 if (!iov)
2031 goto out;
2032 }
2033
2034 /* This will also move the address data into kernel space */
2035 if (MSG_CMSG_COMPAT & flags) {
2036 err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
2037 } else
2038 err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
2039 if (err < 0)
2040 goto out_freeiov;
2041 total_len = err;
2042
2043 err = -ENOBUFS;
2044
2045 if (msg_sys->msg_controllen > INT_MAX)
2046 goto out_freeiov;
2047 ctl_len = msg_sys->msg_controllen;
2048 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
2049 err =
2050 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
2051 sizeof(ctl));
2052 if (err)
2053 goto out_freeiov;
2054 ctl_buf = msg_sys->msg_control;
2055 ctl_len = msg_sys->msg_controllen;
2056 } else if (ctl_len) {
2057 if (ctl_len > sizeof(ctl)) {
2058 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
2059 if (ctl_buf == NULL)
2060 goto out_freeiov;
2061 }
2062 err = -EFAULT;
2063 /*
2064 * Careful! Before this, msg_sys->msg_control contains a user pointer.
2065 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2066 * checking falls down on this.
2067 */
2068 if (copy_from_user(ctl_buf,
2069 (void __user __force *)msg_sys->msg_control,
2070 ctl_len))
2071 goto out_freectl;
2072 msg_sys->msg_control = ctl_buf;
2073 }
2074 msg_sys->msg_flags = flags;
2075
2076 if (sock->file->f_flags & O_NONBLOCK)
2077 msg_sys->msg_flags |= MSG_DONTWAIT;
2078 /*
2079 * If this is sendmmsg() and current destination address is same as
2080 * previously succeeded address, omit asking LSM's decision.
2081 * used_address->name_len is initialized to UINT_MAX so that the first
2082 * destination address never matches.
2083 */
2084 if (used_address && msg_sys->msg_name &&
2085 used_address->name_len == msg_sys->msg_namelen &&
2086 !memcmp(&used_address->name, msg_sys->msg_name,
2087 used_address->name_len)) {
2088 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
2089 goto out_freectl;
2090 }
2091 err = sock_sendmsg(sock, msg_sys, total_len);
2092 /*
2093 * If this is sendmmsg() and sending to current destination address was
2094 * successful, remember it.
2095 */
2096 if (used_address && err >= 0) {
2097 used_address->name_len = msg_sys->msg_namelen;
2098 if (msg_sys->msg_name)
2099 memcpy(&used_address->name, msg_sys->msg_name,
2100 used_address->name_len);
2101 }
2102
2103out_freectl:
2104 if (ctl_buf != ctl)
2105 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2106out_freeiov:
2107 if (iov != iovstack)
2108 kfree(iov);
2109out:
2110 return err;
2111}
2112
2113/*
2114 * BSD sendmsg interface
2115 */
2116
2117long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
2118{
2119 int fput_needed, err;
2120 struct msghdr msg_sys;
2121 struct socket *sock;
2122
2123 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2124 if (!sock)
2125 goto out;
2126
2127 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2128
2129 fput_light(sock->file, fput_needed);
2130out:
2131 return err;
2132}
2133
2134SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
2135{
2136 if (flags & MSG_CMSG_COMPAT)
2137 return -EINVAL;
2138 return __sys_sendmsg(fd, msg, flags);
2139}
2140
2141/*
2142 * Linux sendmmsg interface
2143 */
2144
2145int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2146 unsigned int flags)
2147{
2148 int fput_needed, err, datagrams;
2149 struct socket *sock;
2150 struct mmsghdr __user *entry;
2151 struct compat_mmsghdr __user *compat_entry;
2152 struct msghdr msg_sys;
2153 struct used_address used_address;
2154
2155 if (vlen > UIO_MAXIOV)
2156 vlen = UIO_MAXIOV;
2157
2158 datagrams = 0;
2159
2160 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2161 if (!sock)
2162 return err;
2163
2164 used_address.name_len = UINT_MAX;
2165 entry = mmsg;
2166 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2167 err = 0;
2168
2169 while (datagrams < vlen) {
2170 if (MSG_CMSG_COMPAT & flags) {
2171 err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2172 &msg_sys, flags, &used_address);
2173 if (err < 0)
2174 break;
2175 err = __put_user(err, &compat_entry->msg_len);
2176 ++compat_entry;
2177 } else {
2178 err = ___sys_sendmsg(sock,
2179 (struct msghdr __user *)entry,
2180 &msg_sys, flags, &used_address);
2181 if (err < 0)
2182 break;
2183 err = put_user(err, &entry->msg_len);
2184 ++entry;
2185 }
2186
2187 if (err)
2188 break;
2189 ++datagrams;
2190 }
2191
2192 fput_light(sock->file, fput_needed);
2193
2194 /* We only return an error if no datagrams were able to be sent */
2195 if (datagrams != 0)
2196 return datagrams;
2197
2198 return err;
2199}
2200
2201SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2202 unsigned int, vlen, unsigned int, flags)
2203{
2204 if (flags & MSG_CMSG_COMPAT)
2205 return -EINVAL;
2206 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2207}
2208
2209static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2210 struct msghdr *msg_sys, unsigned int flags, int nosec)
2211{
2212 struct compat_msghdr __user *msg_compat =
2213 (struct compat_msghdr __user *)msg;
2214 struct iovec iovstack[UIO_FASTIOV];
2215 struct iovec *iov = iovstack;
2216 unsigned long cmsg_ptr;
2217 int err, total_len, len;
2218
2219 /* kernel mode address */
2220 struct sockaddr_storage addr;
2221
2222 /* user mode address pointers */
2223 struct sockaddr __user *uaddr;
2224 int __user *uaddr_len;
2225
2226 if (MSG_CMSG_COMPAT & flags) {
2227 if (get_compat_msghdr(msg_sys, msg_compat))
2228 return -EFAULT;
2229 } else {
2230 err = copy_msghdr_from_user(msg_sys, msg);
2231 if (err)
2232 return err;
2233 }
2234
2235 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2236 err = -EMSGSIZE;
2237 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2238 goto out;
2239 err = -ENOMEM;
2240 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2241 GFP_KERNEL);
2242 if (!iov)
2243 goto out;
2244 }
2245
2246 /* Save the user-mode address (verify_iovec will change the
2247 * kernel msghdr to use the kernel address space)
2248 */
2249 uaddr = (__force void __user *)msg_sys->msg_name;
2250 uaddr_len = COMPAT_NAMELEN(msg);
2251 if (MSG_CMSG_COMPAT & flags)
2252 err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
2253 else
2254 err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
2255 if (err < 0)
2256 goto out_freeiov;
2257 total_len = err;
2258
2259 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2260 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2261
2262 /* We assume all kernel code knows the size of sockaddr_storage */
2263 msg_sys->msg_namelen = 0;
2264
2265 if (sock->file->f_flags & O_NONBLOCK)
2266 flags |= MSG_DONTWAIT;
2267 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2268 total_len, flags);
2269 if (err < 0)
2270 goto out_freeiov;
2271 len = err;
2272
2273 if (uaddr != NULL) {
2274 err = move_addr_to_user(&addr,
2275 msg_sys->msg_namelen, uaddr,
2276 uaddr_len);
2277 if (err < 0)
2278 goto out_freeiov;
2279 }
2280 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2281 COMPAT_FLAGS(msg));
2282 if (err)
2283 goto out_freeiov;
2284 if (MSG_CMSG_COMPAT & flags)
2285 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2286 &msg_compat->msg_controllen);
2287 else
2288 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2289 &msg->msg_controllen);
2290 if (err)
2291 goto out_freeiov;
2292 err = len;
2293
2294out_freeiov:
2295 if (iov != iovstack)
2296 kfree(iov);
2297out:
2298 return err;
2299}
2300
2301/*
2302 * BSD recvmsg interface
2303 */
2304
2305long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
2306{
2307 int fput_needed, err;
2308 struct msghdr msg_sys;
2309 struct socket *sock;
2310
2311 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2312 if (!sock)
2313 goto out;
2314
2315 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2316
2317 fput_light(sock->file, fput_needed);
2318out:
2319 return err;
2320}
2321
2322SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2323 unsigned int, flags)
2324{
2325 if (flags & MSG_CMSG_COMPAT)
2326 return -EINVAL;
2327 return __sys_recvmsg(fd, msg, flags);
2328}
2329
2330/*
2331 * Linux recvmmsg interface
2332 */
2333
2334int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2335 unsigned int flags, struct timespec *timeout)
2336{
2337 int fput_needed, err, datagrams;
2338 struct socket *sock;
2339 struct mmsghdr __user *entry;
2340 struct compat_mmsghdr __user *compat_entry;
2341 struct msghdr msg_sys;
2342 struct timespec end_time;
2343
2344 if (timeout &&
2345 poll_select_set_timeout(&end_time, timeout->tv_sec,
2346 timeout->tv_nsec))
2347 return -EINVAL;
2348
2349 datagrams = 0;
2350
2351 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2352 if (!sock)
2353 return err;
2354
2355 err = sock_error(sock->sk);
2356 if (err)
2357 goto out_put;
2358
2359 entry = mmsg;
2360 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2361
2362 while (datagrams < vlen) {
2363 /*
2364 * No need to ask LSM for more than the first datagram.
2365 */
2366 if (MSG_CMSG_COMPAT & flags) {
2367 err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2368 &msg_sys, flags & ~MSG_WAITFORONE,
2369 datagrams);
2370 if (err < 0)
2371 break;
2372 err = __put_user(err, &compat_entry->msg_len);
2373 ++compat_entry;
2374 } else {
2375 err = ___sys_recvmsg(sock,
2376 (struct msghdr __user *)entry,
2377 &msg_sys, flags & ~MSG_WAITFORONE,
2378 datagrams);
2379 if (err < 0)
2380 break;
2381 err = put_user(err, &entry->msg_len);
2382 ++entry;
2383 }
2384
2385 if (err)
2386 break;
2387 ++datagrams;
2388
2389 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2390 if (flags & MSG_WAITFORONE)
2391 flags |= MSG_DONTWAIT;
2392
2393 if (timeout) {
2394 ktime_get_ts(timeout);
2395 *timeout = timespec_sub(end_time, *timeout);
2396 if (timeout->tv_sec < 0) {
2397 timeout->tv_sec = timeout->tv_nsec = 0;
2398 break;
2399 }
2400
2401 /* Timeout, return less than vlen datagrams */
2402 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2403 break;
2404 }
2405
2406 /* Out of band data, return right away */
2407 if (msg_sys.msg_flags & MSG_OOB)
2408 break;
2409 }
2410
2411out_put:
2412 fput_light(sock->file, fput_needed);
2413
2414 if (err == 0)
2415 return datagrams;
2416
2417 if (datagrams != 0) {
2418 /*
2419 * We may return less entries than requested (vlen) if the
2420 * sock is non block and there aren't enough datagrams...
2421 */
2422 if (err != -EAGAIN) {
2423 /*
2424 * ... or if recvmsg returns an error after we
2425 * received some datagrams, where we record the
2426 * error to return on the next call or if the
2427 * app asks about it using getsockopt(SO_ERROR).
2428 */
2429 sock->sk->sk_err = -err;
2430 }
2431
2432 return datagrams;
2433 }
2434
2435 return err;
2436}
2437
2438SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2439 unsigned int, vlen, unsigned int, flags,
2440 struct timespec __user *, timeout)
2441{
2442 int datagrams;
2443 struct timespec timeout_sys;
2444
2445 if (flags & MSG_CMSG_COMPAT)
2446 return -EINVAL;
2447
2448 if (!timeout)
2449 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2450
2451 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2452 return -EFAULT;
2453
2454 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2455
2456 if (datagrams > 0 &&
2457 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2458 datagrams = -EFAULT;
2459
2460 return datagrams;
2461}
2462
2463#ifdef __ARCH_WANT_SYS_SOCKETCALL
2464/* Argument list sizes for sys_socketcall */
2465#define AL(x) ((x) * sizeof(unsigned long))
2466static const unsigned char nargs[21] = {
2467 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2468 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2469 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2470 AL(4), AL(5), AL(4)
2471};
2472
2473#undef AL
2474
2475/*
2476 * System call vectors.
2477 *
2478 * Argument checking cleaned up. Saved 20% in size.
2479 * This function doesn't need to set the kernel lock because
2480 * it is set by the callees.
2481 */
2482
2483SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2484{
2485 unsigned long a[AUDITSC_ARGS];
2486 unsigned long a0, a1;
2487 int err;
2488 unsigned int len;
2489
2490 if (call < 1 || call > SYS_SENDMMSG)
2491 return -EINVAL;
2492
2493 len = nargs[call];
2494 if (len > sizeof(a))
2495 return -EINVAL;
2496
2497 /* copy_from_user should be SMP safe. */
2498 if (copy_from_user(a, args, len))
2499 return -EFAULT;
2500
2501 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2502 if (err)
2503 return err;
2504
2505 a0 = a[0];
2506 a1 = a[1];
2507
2508 switch (call) {
2509 case SYS_SOCKET:
2510 err = sys_socket(a0, a1, a[2]);
2511 break;
2512 case SYS_BIND:
2513 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2514 break;
2515 case SYS_CONNECT:
2516 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2517 break;
2518 case SYS_LISTEN:
2519 err = sys_listen(a0, a1);
2520 break;
2521 case SYS_ACCEPT:
2522 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2523 (int __user *)a[2], 0);
2524 break;
2525 case SYS_GETSOCKNAME:
2526 err =
2527 sys_getsockname(a0, (struct sockaddr __user *)a1,
2528 (int __user *)a[2]);
2529 break;
2530 case SYS_GETPEERNAME:
2531 err =
2532 sys_getpeername(a0, (struct sockaddr __user *)a1,
2533 (int __user *)a[2]);
2534 break;
2535 case SYS_SOCKETPAIR:
2536 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2537 break;
2538 case SYS_SEND:
2539 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2540 break;
2541 case SYS_SENDTO:
2542 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2543 (struct sockaddr __user *)a[4], a[5]);
2544 break;
2545 case SYS_RECV:
2546 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2547 break;
2548 case SYS_RECVFROM:
2549 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2550 (struct sockaddr __user *)a[4],
2551 (int __user *)a[5]);
2552 break;
2553 case SYS_SHUTDOWN:
2554 err = sys_shutdown(a0, a1);
2555 break;
2556 case SYS_SETSOCKOPT:
2557 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2558 break;
2559 case SYS_GETSOCKOPT:
2560 err =
2561 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2562 (int __user *)a[4]);
2563 break;
2564 case SYS_SENDMSG:
2565 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2566 break;
2567 case SYS_SENDMMSG:
2568 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2569 break;
2570 case SYS_RECVMSG:
2571 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2572 break;
2573 case SYS_RECVMMSG:
2574 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2575 (struct timespec __user *)a[4]);
2576 break;
2577 case SYS_ACCEPT4:
2578 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2579 (int __user *)a[2], a[3]);
2580 break;
2581 default:
2582 err = -EINVAL;
2583 break;
2584 }
2585 return err;
2586}
2587
2588#endif /* __ARCH_WANT_SYS_SOCKETCALL */
2589
2590/**
2591 * sock_register - add a socket protocol handler
2592 * @ops: description of protocol
2593 *
2594 * This function is called by a protocol handler that wants to
2595 * advertise its address family, and have it linked into the
2596 * socket interface. The value ops->family coresponds to the
2597 * socket system call protocol family.
2598 */
2599int sock_register(const struct net_proto_family *ops)
2600{
2601 int err;
2602
2603 if (ops->family >= NPROTO) {
2604 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
2605 return -ENOBUFS;
2606 }
2607
2608 spin_lock(&net_family_lock);
2609 if (rcu_dereference_protected(net_families[ops->family],
2610 lockdep_is_held(&net_family_lock)))
2611 err = -EEXIST;
2612 else {
2613 rcu_assign_pointer(net_families[ops->family], ops);
2614 err = 0;
2615 }
2616 spin_unlock(&net_family_lock);
2617
2618 pr_info("NET: Registered protocol family %d\n", ops->family);
2619 return err;
2620}
2621EXPORT_SYMBOL(sock_register);
2622
2623/**
2624 * sock_unregister - remove a protocol handler
2625 * @family: protocol family to remove
2626 *
2627 * This function is called by a protocol handler that wants to
2628 * remove its address family, and have it unlinked from the
2629 * new socket creation.
2630 *
2631 * If protocol handler is a module, then it can use module reference
2632 * counts to protect against new references. If protocol handler is not
2633 * a module then it needs to provide its own protection in
2634 * the ops->create routine.
2635 */
2636void sock_unregister(int family)
2637{
2638 BUG_ON(family < 0 || family >= NPROTO);
2639
2640 spin_lock(&net_family_lock);
2641 RCU_INIT_POINTER(net_families[family], NULL);
2642 spin_unlock(&net_family_lock);
2643
2644 synchronize_rcu();
2645
2646 pr_info("NET: Unregistered protocol family %d\n", family);
2647}
2648EXPORT_SYMBOL(sock_unregister);
2649
2650static int __init sock_init(void)
2651{
2652 int err;
2653 /*
2654 * Initialize the network sysctl infrastructure.
2655 */
2656 err = net_sysctl_init();
2657 if (err)
2658 goto out;
2659
2660 /*
2661 * Initialize skbuff SLAB cache
2662 */
2663 skb_init();
2664
2665 /*
2666 * Initialize the protocols module.
2667 */
2668
2669 init_inodecache();
2670
2671 err = register_filesystem(&sock_fs_type);
2672 if (err)
2673 goto out_fs;
2674 sock_mnt = kern_mount(&sock_fs_type);
2675 if (IS_ERR(sock_mnt)) {
2676 err = PTR_ERR(sock_mnt);
2677 goto out_mount;
2678 }
2679
2680 /* The real protocol initialization is performed in later initcalls.
2681 */
2682
2683#ifdef CONFIG_NETFILTER
2684 err = netfilter_init();
2685 if (err)
2686 goto out;
2687#endif
2688
2689 ptp_classifier_init();
2690
2691out:
2692 return err;
2693
2694out_mount:
2695 unregister_filesystem(&sock_fs_type);
2696out_fs:
2697 goto out;
2698}
2699
2700core_initcall(sock_init); /* early initcall */
2701
2702#ifdef CONFIG_PROC_FS
2703void socket_seq_show(struct seq_file *seq)
2704{
2705 int cpu;
2706 int counter = 0;
2707
2708 for_each_possible_cpu(cpu)
2709 counter += per_cpu(sockets_in_use, cpu);
2710
2711 /* It can be negative, by the way. 8) */
2712 if (counter < 0)
2713 counter = 0;
2714
2715 seq_printf(seq, "sockets: used %d\n", counter);
2716}
2717#endif /* CONFIG_PROC_FS */
2718
2719#ifdef CONFIG_COMPAT
2720static int do_siocgstamp(struct net *net, struct socket *sock,
2721 unsigned int cmd, void __user *up)
2722{
2723 mm_segment_t old_fs = get_fs();
2724 struct timeval ktv;
2725 int err;
2726
2727 set_fs(KERNEL_DS);
2728 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2729 set_fs(old_fs);
2730 if (!err)
2731 err = compat_put_timeval(&ktv, up);
2732
2733 return err;
2734}
2735
2736static int do_siocgstampns(struct net *net, struct socket *sock,
2737 unsigned int cmd, void __user *up)
2738{
2739 mm_segment_t old_fs = get_fs();
2740 struct timespec kts;
2741 int err;
2742
2743 set_fs(KERNEL_DS);
2744 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2745 set_fs(old_fs);
2746 if (!err)
2747 err = compat_put_timespec(&kts, up);
2748
2749 return err;
2750}
2751
2752static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2753{
2754 struct ifreq __user *uifr;
2755 int err;
2756
2757 uifr = compat_alloc_user_space(sizeof(struct ifreq));
2758 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2759 return -EFAULT;
2760
2761 err = dev_ioctl(net, SIOCGIFNAME, uifr);
2762 if (err)
2763 return err;
2764
2765 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2766 return -EFAULT;
2767
2768 return 0;
2769}
2770
2771static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2772{
2773 struct compat_ifconf ifc32;
2774 struct ifconf ifc;
2775 struct ifconf __user *uifc;
2776 struct compat_ifreq __user *ifr32;
2777 struct ifreq __user *ifr;
2778 unsigned int i, j;
2779 int err;
2780
2781 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2782 return -EFAULT;
2783
2784 memset(&ifc, 0, sizeof(ifc));
2785 if (ifc32.ifcbuf == 0) {
2786 ifc32.ifc_len = 0;
2787 ifc.ifc_len = 0;
2788 ifc.ifc_req = NULL;
2789 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2790 } else {
2791 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2792 sizeof(struct ifreq);
2793 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2794 ifc.ifc_len = len;
2795 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2796 ifr32 = compat_ptr(ifc32.ifcbuf);
2797 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2798 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2799 return -EFAULT;
2800 ifr++;
2801 ifr32++;
2802 }
2803 }
2804 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2805 return -EFAULT;
2806
2807 err = dev_ioctl(net, SIOCGIFCONF, uifc);
2808 if (err)
2809 return err;
2810
2811 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2812 return -EFAULT;
2813
2814 ifr = ifc.ifc_req;
2815 ifr32 = compat_ptr(ifc32.ifcbuf);
2816 for (i = 0, j = 0;
2817 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2818 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2819 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2820 return -EFAULT;
2821 ifr32++;
2822 ifr++;
2823 }
2824
2825 if (ifc32.ifcbuf == 0) {
2826 /* Translate from 64-bit structure multiple to
2827 * a 32-bit one.
2828 */
2829 i = ifc.ifc_len;
2830 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2831 ifc32.ifc_len = i;
2832 } else {
2833 ifc32.ifc_len = i;
2834 }
2835 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2836 return -EFAULT;
2837
2838 return 0;
2839}
2840
2841static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2842{
2843 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2844 bool convert_in = false, convert_out = false;
2845 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2846 struct ethtool_rxnfc __user *rxnfc;
2847 struct ifreq __user *ifr;
2848 u32 rule_cnt = 0, actual_rule_cnt;
2849 u32 ethcmd;
2850 u32 data;
2851 int ret;
2852
2853 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2854 return -EFAULT;
2855
2856 compat_rxnfc = compat_ptr(data);
2857
2858 if (get_user(ethcmd, &compat_rxnfc->cmd))
2859 return -EFAULT;
2860
2861 /* Most ethtool structures are defined without padding.
2862 * Unfortunately struct ethtool_rxnfc is an exception.
2863 */
2864 switch (ethcmd) {
2865 default:
2866 break;
2867 case ETHTOOL_GRXCLSRLALL:
2868 /* Buffer size is variable */
2869 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2870 return -EFAULT;
2871 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2872 return -ENOMEM;
2873 buf_size += rule_cnt * sizeof(u32);
2874 /* fall through */
2875 case ETHTOOL_GRXRINGS:
2876 case ETHTOOL_GRXCLSRLCNT:
2877 case ETHTOOL_GRXCLSRULE:
2878 case ETHTOOL_SRXCLSRLINS:
2879 convert_out = true;
2880 /* fall through */
2881 case ETHTOOL_SRXCLSRLDEL:
2882 buf_size += sizeof(struct ethtool_rxnfc);
2883 convert_in = true;
2884 break;
2885 }
2886
2887 ifr = compat_alloc_user_space(buf_size);
2888 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
2889
2890 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2891 return -EFAULT;
2892
2893 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2894 &ifr->ifr_ifru.ifru_data))
2895 return -EFAULT;
2896
2897 if (convert_in) {
2898 /* We expect there to be holes between fs.m_ext and
2899 * fs.ring_cookie and at the end of fs, but nowhere else.
2900 */
2901 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2902 sizeof(compat_rxnfc->fs.m_ext) !=
2903 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2904 sizeof(rxnfc->fs.m_ext));
2905 BUILD_BUG_ON(
2906 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2907 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2908 offsetof(struct ethtool_rxnfc, fs.location) -
2909 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2910
2911 if (copy_in_user(rxnfc, compat_rxnfc,
2912 (void __user *)(&rxnfc->fs.m_ext + 1) -
2913 (void __user *)rxnfc) ||
2914 copy_in_user(&rxnfc->fs.ring_cookie,
2915 &compat_rxnfc->fs.ring_cookie,
2916 (void __user *)(&rxnfc->fs.location + 1) -
2917 (void __user *)&rxnfc->fs.ring_cookie) ||
2918 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2919 sizeof(rxnfc->rule_cnt)))
2920 return -EFAULT;
2921 }
2922
2923 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2924 if (ret)
2925 return ret;
2926
2927 if (convert_out) {
2928 if (copy_in_user(compat_rxnfc, rxnfc,
2929 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2930 (const void __user *)rxnfc) ||
2931 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2932 &rxnfc->fs.ring_cookie,
2933 (const void __user *)(&rxnfc->fs.location + 1) -
2934 (const void __user *)&rxnfc->fs.ring_cookie) ||
2935 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2936 sizeof(rxnfc->rule_cnt)))
2937 return -EFAULT;
2938
2939 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2940 /* As an optimisation, we only copy the actual
2941 * number of rules that the underlying
2942 * function returned. Since Mallory might
2943 * change the rule count in user memory, we
2944 * check that it is less than the rule count
2945 * originally given (as the user buffer size),
2946 * which has been range-checked.
2947 */
2948 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2949 return -EFAULT;
2950 if (actual_rule_cnt < rule_cnt)
2951 rule_cnt = actual_rule_cnt;
2952 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2953 &rxnfc->rule_locs[0],
2954 rule_cnt * sizeof(u32)))
2955 return -EFAULT;
2956 }
2957 }
2958
2959 return 0;
2960}
2961
2962static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2963{
2964 void __user *uptr;
2965 compat_uptr_t uptr32;
2966 struct ifreq __user *uifr;
2967
2968 uifr = compat_alloc_user_space(sizeof(*uifr));
2969 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2970 return -EFAULT;
2971
2972 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2973 return -EFAULT;
2974
2975 uptr = compat_ptr(uptr32);
2976
2977 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2978 return -EFAULT;
2979
2980 return dev_ioctl(net, SIOCWANDEV, uifr);
2981}
2982
2983static int bond_ioctl(struct net *net, unsigned int cmd,
2984 struct compat_ifreq __user *ifr32)
2985{
2986 struct ifreq kifr;
2987 mm_segment_t old_fs;
2988 int err;
2989
2990 switch (cmd) {
2991 case SIOCBONDENSLAVE:
2992 case SIOCBONDRELEASE:
2993 case SIOCBONDSETHWADDR:
2994 case SIOCBONDCHANGEACTIVE:
2995 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2996 return -EFAULT;
2997
2998 old_fs = get_fs();
2999 set_fs(KERNEL_DS);
3000 err = dev_ioctl(net, cmd,
3001 (struct ifreq __user __force *) &kifr);
3002 set_fs(old_fs);
3003
3004 return err;
3005 default:
3006 return -ENOIOCTLCMD;
3007 }
3008}
3009
3010/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3011static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
3012 struct compat_ifreq __user *u_ifreq32)
3013{
3014 struct ifreq __user *u_ifreq64;
3015 char tmp_buf[IFNAMSIZ];
3016 void __user *data64;
3017 u32 data32;
3018
3019 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
3020 IFNAMSIZ))
3021 return -EFAULT;
3022 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
3023 return -EFAULT;
3024 data64 = compat_ptr(data32);
3025
3026 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
3027
3028 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
3029 IFNAMSIZ))
3030 return -EFAULT;
3031 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
3032 return -EFAULT;
3033
3034 return dev_ioctl(net, cmd, u_ifreq64);
3035}
3036
3037static int dev_ifsioc(struct net *net, struct socket *sock,
3038 unsigned int cmd, struct compat_ifreq __user *uifr32)
3039{
3040 struct ifreq __user *uifr;
3041 int err;
3042
3043 uifr = compat_alloc_user_space(sizeof(*uifr));
3044 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3045 return -EFAULT;
3046
3047 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3048
3049 if (!err) {
3050 switch (cmd) {
3051 case SIOCGIFFLAGS:
3052 case SIOCGIFMETRIC:
3053 case SIOCGIFMTU:
3054 case SIOCGIFMEM:
3055 case SIOCGIFHWADDR:
3056 case SIOCGIFINDEX:
3057 case SIOCGIFADDR:
3058 case SIOCGIFBRDADDR:
3059 case SIOCGIFDSTADDR:
3060 case SIOCGIFNETMASK:
3061 case SIOCGIFPFLAGS:
3062 case SIOCGIFTXQLEN:
3063 case SIOCGMIIPHY:
3064 case SIOCGMIIREG:
3065 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3066 err = -EFAULT;
3067 break;
3068 }
3069 }
3070 return err;
3071}
3072
3073static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3074 struct compat_ifreq __user *uifr32)
3075{
3076 struct ifreq ifr;
3077 struct compat_ifmap __user *uifmap32;
3078 mm_segment_t old_fs;
3079 int err;
3080
3081 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3082 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
3083 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3084 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3085 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3086 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3087 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3088 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
3089 if (err)
3090 return -EFAULT;
3091
3092 old_fs = get_fs();
3093 set_fs(KERNEL_DS);
3094 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
3095 set_fs(old_fs);
3096
3097 if (cmd == SIOCGIFMAP && !err) {
3098 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
3099 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3100 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3101 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3102 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3103 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3104 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
3105 if (err)
3106 err = -EFAULT;
3107 }
3108 return err;
3109}
3110
3111struct rtentry32 {
3112 u32 rt_pad1;
3113 struct sockaddr rt_dst; /* target address */
3114 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3115 struct sockaddr rt_genmask; /* target network mask (IP) */
3116 unsigned short rt_flags;
3117 short rt_pad2;
3118 u32 rt_pad3;
3119 unsigned char rt_tos;
3120 unsigned char rt_class;
3121 short rt_pad4;
3122 short rt_metric; /* +1 for binary compatibility! */
3123 /* char * */ u32 rt_dev; /* forcing the device at add */
3124 u32 rt_mtu; /* per route MTU/Window */
3125 u32 rt_window; /* Window clamping */
3126 unsigned short rt_irtt; /* Initial RTT */
3127};
3128
3129struct in6_rtmsg32 {
3130 struct in6_addr rtmsg_dst;
3131 struct in6_addr rtmsg_src;
3132 struct in6_addr rtmsg_gateway;
3133 u32 rtmsg_type;
3134 u16 rtmsg_dst_len;
3135 u16 rtmsg_src_len;
3136 u32 rtmsg_metric;
3137 u32 rtmsg_info;
3138 u32 rtmsg_flags;
3139 s32 rtmsg_ifindex;
3140};
3141
3142static int routing_ioctl(struct net *net, struct socket *sock,
3143 unsigned int cmd, void __user *argp)
3144{
3145 int ret;
3146 void *r = NULL;
3147 struct in6_rtmsg r6;
3148 struct rtentry r4;
3149 char devname[16];
3150 u32 rtdev;
3151 mm_segment_t old_fs = get_fs();
3152
3153 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3154 struct in6_rtmsg32 __user *ur6 = argp;
3155 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3156 3 * sizeof(struct in6_addr));
3157 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3158 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3159 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3160 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3161 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3162 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3163 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3164
3165 r = (void *) &r6;
3166 } else { /* ipv4 */
3167 struct rtentry32 __user *ur4 = argp;
3168 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3169 3 * sizeof(struct sockaddr));
3170 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3171 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3172 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3173 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3174 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3175 ret |= get_user(rtdev, &(ur4->rt_dev));
3176 if (rtdev) {
3177 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3178 r4.rt_dev = (char __user __force *)devname;
3179 devname[15] = 0;
3180 } else
3181 r4.rt_dev = NULL;
3182
3183 r = (void *) &r4;
3184 }
3185
3186 if (ret) {
3187 ret = -EFAULT;
3188 goto out;
3189 }
3190
3191 set_fs(KERNEL_DS);
3192 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3193 set_fs(old_fs);
3194
3195out:
3196 return ret;
3197}
3198
3199/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3200 * for some operations; this forces use of the newer bridge-utils that
3201 * use compatible ioctls
3202 */
3203static int old_bridge_ioctl(compat_ulong_t __user *argp)
3204{
3205 compat_ulong_t tmp;
3206
3207 if (get_user(tmp, argp))
3208 return -EFAULT;
3209 if (tmp == BRCTL_GET_VERSION)
3210 return BRCTL_VERSION + 1;
3211 return -EINVAL;
3212}
3213
3214static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3215 unsigned int cmd, unsigned long arg)
3216{
3217 void __user *argp = compat_ptr(arg);
3218 struct sock *sk = sock->sk;
3219 struct net *net = sock_net(sk);
3220
3221 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3222 return compat_ifr_data_ioctl(net, cmd, argp);
3223
3224 switch (cmd) {
3225 case SIOCSIFBR:
3226 case SIOCGIFBR:
3227 return old_bridge_ioctl(argp);
3228 case SIOCGIFNAME:
3229 return dev_ifname32(net, argp);
3230 case SIOCGIFCONF:
3231 return dev_ifconf(net, argp);
3232 case SIOCETHTOOL:
3233 return ethtool_ioctl(net, argp);
3234 case SIOCWANDEV:
3235 return compat_siocwandev(net, argp);
3236 case SIOCGIFMAP:
3237 case SIOCSIFMAP:
3238 return compat_sioc_ifmap(net, cmd, argp);
3239 case SIOCBONDENSLAVE:
3240 case SIOCBONDRELEASE:
3241 case SIOCBONDSETHWADDR:
3242 case SIOCBONDCHANGEACTIVE:
3243 return bond_ioctl(net, cmd, argp);
3244 case SIOCADDRT:
3245 case SIOCDELRT:
3246 return routing_ioctl(net, sock, cmd, argp);
3247 case SIOCGSTAMP:
3248 return do_siocgstamp(net, sock, cmd, argp);
3249 case SIOCGSTAMPNS:
3250 return do_siocgstampns(net, sock, cmd, argp);
3251 case SIOCBONDSLAVEINFOQUERY:
3252 case SIOCBONDINFOQUERY:
3253 case SIOCSHWTSTAMP:
3254 case SIOCGHWTSTAMP:
3255 return compat_ifr_data_ioctl(net, cmd, argp);
3256
3257 case FIOSETOWN:
3258 case SIOCSPGRP:
3259 case FIOGETOWN:
3260 case SIOCGPGRP:
3261 case SIOCBRADDBR:
3262 case SIOCBRDELBR:
3263 case SIOCGIFVLAN:
3264 case SIOCSIFVLAN:
3265 case SIOCADDDLCI:
3266 case SIOCDELDLCI:
3267 return sock_ioctl(file, cmd, arg);
3268
3269 case SIOCGIFFLAGS:
3270 case SIOCSIFFLAGS:
3271 case SIOCGIFMETRIC:
3272 case SIOCSIFMETRIC:
3273 case SIOCGIFMTU:
3274 case SIOCSIFMTU:
3275 case SIOCGIFMEM:
3276 case SIOCSIFMEM:
3277 case SIOCGIFHWADDR:
3278 case SIOCSIFHWADDR:
3279 case SIOCADDMULTI:
3280 case SIOCDELMULTI:
3281 case SIOCGIFINDEX:
3282 case SIOCGIFADDR:
3283 case SIOCSIFADDR:
3284 case SIOCSIFHWBROADCAST:
3285 case SIOCDIFADDR:
3286 case SIOCGIFBRDADDR:
3287 case SIOCSIFBRDADDR:
3288 case SIOCGIFDSTADDR:
3289 case SIOCSIFDSTADDR:
3290 case SIOCGIFNETMASK:
3291 case SIOCSIFNETMASK:
3292 case SIOCSIFPFLAGS:
3293 case SIOCGIFPFLAGS:
3294 case SIOCGIFTXQLEN:
3295 case SIOCSIFTXQLEN:
3296 case SIOCBRADDIF:
3297 case SIOCBRDELIF:
3298 case SIOCSIFNAME:
3299 case SIOCGMIIPHY:
3300 case SIOCGMIIREG:
3301 case SIOCSMIIREG:
3302 return dev_ifsioc(net, sock, cmd, argp);
3303
3304 case SIOCSARP:
3305 case SIOCGARP:
3306 case SIOCDARP:
3307 case SIOCATMARK:
3308 return sock_do_ioctl(net, sock, cmd, arg);
3309 }
3310
3311 return -ENOIOCTLCMD;
3312}
3313
3314static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3315 unsigned long arg)
3316{
3317 struct socket *sock = file->private_data;
3318 int ret = -ENOIOCTLCMD;
3319 struct sock *sk;
3320 struct net *net;
3321
3322 sk = sock->sk;
3323 net = sock_net(sk);
3324
3325 if (sock->ops->compat_ioctl)
3326 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3327
3328 if (ret == -ENOIOCTLCMD &&
3329 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3330 ret = compat_wext_handle_ioctl(net, cmd, arg);
3331
3332 if (ret == -ENOIOCTLCMD)
3333 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3334
3335 return ret;
3336}
3337#endif
3338
3339int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3340{
3341 return sock->ops->bind(sock, addr, addrlen);
3342}
3343EXPORT_SYMBOL(kernel_bind);
3344
3345int kernel_listen(struct socket *sock, int backlog)
3346{
3347 return sock->ops->listen(sock, backlog);
3348}
3349EXPORT_SYMBOL(kernel_listen);
3350
3351int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3352{
3353 struct sock *sk = sock->sk;
3354 int err;
3355
3356 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3357 newsock);
3358 if (err < 0)
3359 goto done;
3360
3361 err = sock->ops->accept(sock, *newsock, flags);
3362 if (err < 0) {
3363 sock_release(*newsock);
3364 *newsock = NULL;
3365 goto done;
3366 }
3367
3368 (*newsock)->ops = sock->ops;
3369 __module_get((*newsock)->ops->owner);
3370
3371done:
3372 return err;
3373}
3374EXPORT_SYMBOL(kernel_accept);
3375
3376int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3377 int flags)
3378{
3379 return sock->ops->connect(sock, addr, addrlen, flags);
3380}
3381EXPORT_SYMBOL(kernel_connect);
3382
3383int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3384 int *addrlen)
3385{
3386 return sock->ops->getname(sock, addr, addrlen, 0);
3387}
3388EXPORT_SYMBOL(kernel_getsockname);
3389
3390int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3391 int *addrlen)
3392{
3393 return sock->ops->getname(sock, addr, addrlen, 1);
3394}
3395EXPORT_SYMBOL(kernel_getpeername);
3396
3397int kernel_getsockopt(struct socket *sock, int level, int optname,
3398 char *optval, int *optlen)
3399{
3400 mm_segment_t oldfs = get_fs();
3401 char __user *uoptval;
3402 int __user *uoptlen;
3403 int err;
3404
3405 uoptval = (char __user __force *) optval;
3406 uoptlen = (int __user __force *) optlen;
3407
3408 set_fs(KERNEL_DS);
3409 if (level == SOL_SOCKET)
3410 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3411 else
3412 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3413 uoptlen);
3414 set_fs(oldfs);
3415 return err;
3416}
3417EXPORT_SYMBOL(kernel_getsockopt);
3418
3419int kernel_setsockopt(struct socket *sock, int level, int optname,
3420 char *optval, unsigned int optlen)
3421{
3422 mm_segment_t oldfs = get_fs();
3423 char __user *uoptval;
3424 int err;
3425
3426 uoptval = (char __user __force *) optval;
3427
3428 set_fs(KERNEL_DS);
3429 if (level == SOL_SOCKET)
3430 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3431 else
3432 err = sock->ops->setsockopt(sock, level, optname, uoptval,
3433 optlen);
3434 set_fs(oldfs);
3435 return err;
3436}
3437EXPORT_SYMBOL(kernel_setsockopt);
3438
3439int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3440 size_t size, int flags)
3441{
3442 if (sock->ops->sendpage)
3443 return sock->ops->sendpage(sock, page, offset, size, flags);
3444
3445 return sock_no_sendpage(sock, page, offset, size, flags);
3446}
3447EXPORT_SYMBOL(kernel_sendpage);
3448
3449int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3450{
3451 mm_segment_t oldfs = get_fs();
3452 int err;
3453
3454 set_fs(KERNEL_DS);
3455 err = sock->ops->ioctl(sock, cmd, arg);
3456 set_fs(oldfs);
3457
3458 return err;
3459}
3460EXPORT_SYMBOL(kernel_sock_ioctl);
3461
3462int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3463{
3464 return sock->ops->shutdown(sock, how);
3465}
3466EXPORT_SYMBOL(kernel_sock_shutdown);