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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/wanrouter.h>
73#include <linux/if_bridge.h>
74#include <linux/if_frad.h>
75#include <linux/if_vlan.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
92#include <asm/uaccess.h>
93#include <asm/unistd.h>
94
95#include <net/compat.h>
96#include <net/wext.h>
97#include <net/cls_cgroup.h>
98
99#include <net/sock.h>
100#include <linux/netfilter.h>
101
102#include <linux/if_tun.h>
103#include <linux/ipv6_route.h>
104#include <linux/route.h>
105#include <linux/sockios.h>
106#include <linux/atalk.h>
107
108static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
109static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
110 unsigned long nr_segs, loff_t pos);
111static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
112 unsigned long nr_segs, loff_t pos);
113static int sock_mmap(struct file *file, struct vm_area_struct *vma);
114
115static int sock_close(struct inode *inode, struct file *file);
116static unsigned int sock_poll(struct file *file,
117 struct poll_table_struct *wait);
118static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
119#ifdef CONFIG_COMPAT
120static long compat_sock_ioctl(struct file *file,
121 unsigned int cmd, unsigned long arg);
122#endif
123static int sock_fasync(int fd, struct file *filp, int on);
124static ssize_t sock_sendpage(struct file *file, struct page *page,
125 int offset, size_t size, loff_t *ppos, int more);
126static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
127 struct pipe_inode_info *pipe, size_t len,
128 unsigned int flags);
129
130/*
131 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
132 * in the operation structures but are done directly via the socketcall() multiplexor.
133 */
134
135static const struct file_operations socket_file_ops = {
136 .owner = THIS_MODULE,
137 .llseek = no_llseek,
138 .aio_read = sock_aio_read,
139 .aio_write = sock_aio_write,
140 .poll = sock_poll,
141 .unlocked_ioctl = sock_ioctl,
142#ifdef CONFIG_COMPAT
143 .compat_ioctl = compat_sock_ioctl,
144#endif
145 .mmap = sock_mmap,
146 .open = sock_no_open, /* special open code to disallow open via /proc */
147 .release = sock_close,
148 .fasync = sock_fasync,
149 .sendpage = sock_sendpage,
150 .splice_write = generic_splice_sendpage,
151 .splice_read = sock_splice_read,
152};
153
154/*
155 * The protocol list. Each protocol is registered in here.
156 */
157
158static DEFINE_SPINLOCK(net_family_lock);
159static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
160
161/*
162 * Statistics counters of the socket lists
163 */
164
165static DEFINE_PER_CPU(int, sockets_in_use);
166
167/*
168 * Support routines.
169 * Move socket addresses back and forth across the kernel/user
170 * divide and look after the messy bits.
171 */
172
173/**
174 * move_addr_to_kernel - copy a socket address into kernel space
175 * @uaddr: Address in user space
176 * @kaddr: Address in kernel space
177 * @ulen: Length in user space
178 *
179 * The address is copied into kernel space. If the provided address is
180 * too long an error code of -EINVAL is returned. If the copy gives
181 * invalid addresses -EFAULT is returned. On a success 0 is returned.
182 */
183
184int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
185{
186 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
187 return -EINVAL;
188 if (ulen == 0)
189 return 0;
190 if (copy_from_user(kaddr, uaddr, ulen))
191 return -EFAULT;
192 return audit_sockaddr(ulen, kaddr);
193}
194
195/**
196 * move_addr_to_user - copy an address to user space
197 * @kaddr: kernel space address
198 * @klen: length of address in kernel
199 * @uaddr: user space address
200 * @ulen: pointer to user length field
201 *
202 * The value pointed to by ulen on entry is the buffer length available.
203 * This is overwritten with the buffer space used. -EINVAL is returned
204 * if an overlong buffer is specified or a negative buffer size. -EFAULT
205 * is returned if either the buffer or the length field are not
206 * accessible.
207 * After copying the data up to the limit the user specifies, the true
208 * length of the data is written over the length limit the user
209 * specified. Zero is returned for a success.
210 */
211
212static int move_addr_to_user(struct sockaddr *kaddr, int klen,
213 void __user *uaddr, int __user *ulen)
214{
215 int err;
216 int len;
217
218 err = get_user(len, ulen);
219 if (err)
220 return err;
221 if (len > klen)
222 len = klen;
223 if (len < 0 || len > sizeof(struct sockaddr_storage))
224 return -EINVAL;
225 if (len) {
226 if (audit_sockaddr(klen, kaddr))
227 return -ENOMEM;
228 if (copy_to_user(uaddr, kaddr, len))
229 return -EFAULT;
230 }
231 /*
232 * "fromlen shall refer to the value before truncation.."
233 * 1003.1g
234 */
235 return __put_user(klen, ulen);
236}
237
238static struct kmem_cache *sock_inode_cachep __read_mostly;
239
240static struct inode *sock_alloc_inode(struct super_block *sb)
241{
242 struct socket_alloc *ei;
243 struct socket_wq *wq;
244
245 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
246 if (!ei)
247 return NULL;
248 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
249 if (!wq) {
250 kmem_cache_free(sock_inode_cachep, ei);
251 return NULL;
252 }
253 init_waitqueue_head(&wq->wait);
254 wq->fasync_list = NULL;
255 RCU_INIT_POINTER(ei->socket.wq, wq);
256
257 ei->socket.state = SS_UNCONNECTED;
258 ei->socket.flags = 0;
259 ei->socket.ops = NULL;
260 ei->socket.sk = NULL;
261 ei->socket.file = NULL;
262
263 return &ei->vfs_inode;
264}
265
266static void sock_destroy_inode(struct inode *inode)
267{
268 struct socket_alloc *ei;
269 struct socket_wq *wq;
270
271 ei = container_of(inode, struct socket_alloc, vfs_inode);
272 wq = rcu_dereference_protected(ei->socket.wq, 1);
273 kfree_rcu(wq, rcu);
274 kmem_cache_free(sock_inode_cachep, ei);
275}
276
277static void init_once(void *foo)
278{
279 struct socket_alloc *ei = (struct socket_alloc *)foo;
280
281 inode_init_once(&ei->vfs_inode);
282}
283
284static int init_inodecache(void)
285{
286 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
287 sizeof(struct socket_alloc),
288 0,
289 (SLAB_HWCACHE_ALIGN |
290 SLAB_RECLAIM_ACCOUNT |
291 SLAB_MEM_SPREAD),
292 init_once);
293 if (sock_inode_cachep == NULL)
294 return -ENOMEM;
295 return 0;
296}
297
298static const struct super_operations sockfs_ops = {
299 .alloc_inode = sock_alloc_inode,
300 .destroy_inode = sock_destroy_inode,
301 .statfs = simple_statfs,
302};
303
304/*
305 * sockfs_dname() is called from d_path().
306 */
307static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
308{
309 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
310 dentry->d_inode->i_ino);
311}
312
313static const struct dentry_operations sockfs_dentry_operations = {
314 .d_dname = sockfs_dname,
315};
316
317static struct dentry *sockfs_mount(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *data)
319{
320 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
321 &sockfs_dentry_operations, SOCKFS_MAGIC);
322}
323
324static struct vfsmount *sock_mnt __read_mostly;
325
326static struct file_system_type sock_fs_type = {
327 .name = "sockfs",
328 .mount = sockfs_mount,
329 .kill_sb = kill_anon_super,
330};
331
332/*
333 * Obtains the first available file descriptor and sets it up for use.
334 *
335 * These functions create file structures and maps them to fd space
336 * of the current process. On success it returns file descriptor
337 * and file struct implicitly stored in sock->file.
338 * Note that another thread may close file descriptor before we return
339 * from this function. We use the fact that now we do not refer
340 * to socket after mapping. If one day we will need it, this
341 * function will increment ref. count on file by 1.
342 *
343 * In any case returned fd MAY BE not valid!
344 * This race condition is unavoidable
345 * with shared fd spaces, we cannot solve it inside kernel,
346 * but we take care of internal coherence yet.
347 */
348
349static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
350{
351 struct qstr name = { .name = "" };
352 struct path path;
353 struct file *file;
354 int fd;
355
356 fd = get_unused_fd_flags(flags);
357 if (unlikely(fd < 0))
358 return fd;
359
360 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
361 if (unlikely(!path.dentry)) {
362 put_unused_fd(fd);
363 return -ENOMEM;
364 }
365 path.mnt = mntget(sock_mnt);
366
367 d_instantiate(path.dentry, SOCK_INODE(sock));
368 SOCK_INODE(sock)->i_fop = &socket_file_ops;
369
370 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
371 &socket_file_ops);
372 if (unlikely(!file)) {
373 /* drop dentry, keep inode */
374 ihold(path.dentry->d_inode);
375 path_put(&path);
376 put_unused_fd(fd);
377 return -ENFILE;
378 }
379
380 sock->file = file;
381 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
382 file->f_pos = 0;
383 file->private_data = sock;
384
385 *f = file;
386 return fd;
387}
388
389int sock_map_fd(struct socket *sock, int flags)
390{
391 struct file *newfile;
392 int fd = sock_alloc_file(sock, &newfile, flags);
393
394 if (likely(fd >= 0))
395 fd_install(fd, newfile);
396
397 return fd;
398}
399EXPORT_SYMBOL(sock_map_fd);
400
401static struct socket *sock_from_file(struct file *file, int *err)
402{
403 if (file->f_op == &socket_file_ops)
404 return file->private_data; /* set in sock_map_fd */
405
406 *err = -ENOTSOCK;
407 return NULL;
408}
409
410/**
411 * sockfd_lookup - Go from a file number to its socket slot
412 * @fd: file handle
413 * @err: pointer to an error code return
414 *
415 * The file handle passed in is locked and the socket it is bound
416 * too is returned. If an error occurs the err pointer is overwritten
417 * with a negative errno code and NULL is returned. The function checks
418 * for both invalid handles and passing a handle which is not a socket.
419 *
420 * On a success the socket object pointer is returned.
421 */
422
423struct socket *sockfd_lookup(int fd, int *err)
424{
425 struct file *file;
426 struct socket *sock;
427
428 file = fget(fd);
429 if (!file) {
430 *err = -EBADF;
431 return NULL;
432 }
433
434 sock = sock_from_file(file, err);
435 if (!sock)
436 fput(file);
437 return sock;
438}
439EXPORT_SYMBOL(sockfd_lookup);
440
441static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
442{
443 struct file *file;
444 struct socket *sock;
445
446 *err = -EBADF;
447 file = fget_light(fd, fput_needed);
448 if (file) {
449 sock = sock_from_file(file, err);
450 if (sock)
451 return sock;
452 fput_light(file, *fput_needed);
453 }
454 return NULL;
455}
456
457/**
458 * sock_alloc - allocate a socket
459 *
460 * Allocate a new inode and socket object. The two are bound together
461 * and initialised. The socket is then returned. If we are out of inodes
462 * NULL is returned.
463 */
464
465static struct socket *sock_alloc(void)
466{
467 struct inode *inode;
468 struct socket *sock;
469
470 inode = new_inode_pseudo(sock_mnt->mnt_sb);
471 if (!inode)
472 return NULL;
473
474 sock = SOCKET_I(inode);
475
476 kmemcheck_annotate_bitfield(sock, type);
477 inode->i_ino = get_next_ino();
478 inode->i_mode = S_IFSOCK | S_IRWXUGO;
479 inode->i_uid = current_fsuid();
480 inode->i_gid = current_fsgid();
481
482 percpu_add(sockets_in_use, 1);
483 return sock;
484}
485
486/*
487 * In theory you can't get an open on this inode, but /proc provides
488 * a back door. Remember to keep it shut otherwise you'll let the
489 * creepy crawlies in.
490 */
491
492static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
493{
494 return -ENXIO;
495}
496
497const struct file_operations bad_sock_fops = {
498 .owner = THIS_MODULE,
499 .open = sock_no_open,
500 .llseek = noop_llseek,
501};
502
503/**
504 * sock_release - close a socket
505 * @sock: socket to close
506 *
507 * The socket is released from the protocol stack if it has a release
508 * callback, and the inode is then released if the socket is bound to
509 * an inode not a file.
510 */
511
512void sock_release(struct socket *sock)
513{
514 if (sock->ops) {
515 struct module *owner = sock->ops->owner;
516
517 sock->ops->release(sock);
518 sock->ops = NULL;
519 module_put(owner);
520 }
521
522 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
523 printk(KERN_ERR "sock_release: fasync list not empty!\n");
524
525 percpu_sub(sockets_in_use, 1);
526 if (!sock->file) {
527 iput(SOCK_INODE(sock));
528 return;
529 }
530 sock->file = NULL;
531}
532EXPORT_SYMBOL(sock_release);
533
534int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
535{
536 *tx_flags = 0;
537 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
538 *tx_flags |= SKBTX_HW_TSTAMP;
539 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
540 *tx_flags |= SKBTX_SW_TSTAMP;
541 return 0;
542}
543EXPORT_SYMBOL(sock_tx_timestamp);
544
545static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
546 struct msghdr *msg, size_t size)
547{
548 struct sock_iocb *si = kiocb_to_siocb(iocb);
549
550 sock_update_classid(sock->sk);
551
552 si->sock = sock;
553 si->scm = NULL;
554 si->msg = msg;
555 si->size = size;
556
557 return sock->ops->sendmsg(iocb, sock, msg, size);
558}
559
560static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
561 struct msghdr *msg, size_t size)
562{
563 int err = security_socket_sendmsg(sock, msg, size);
564
565 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
566}
567
568int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
569{
570 struct kiocb iocb;
571 struct sock_iocb siocb;
572 int ret;
573
574 init_sync_kiocb(&iocb, NULL);
575 iocb.private = &siocb;
576 ret = __sock_sendmsg(&iocb, sock, msg, size);
577 if (-EIOCBQUEUED == ret)
578 ret = wait_on_sync_kiocb(&iocb);
579 return ret;
580}
581EXPORT_SYMBOL(sock_sendmsg);
582
583static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
584{
585 struct kiocb iocb;
586 struct sock_iocb siocb;
587 int ret;
588
589 init_sync_kiocb(&iocb, NULL);
590 iocb.private = &siocb;
591 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
592 if (-EIOCBQUEUED == ret)
593 ret = wait_on_sync_kiocb(&iocb);
594 return ret;
595}
596
597int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
598 struct kvec *vec, size_t num, size_t size)
599{
600 mm_segment_t oldfs = get_fs();
601 int result;
602
603 set_fs(KERNEL_DS);
604 /*
605 * the following is safe, since for compiler definitions of kvec and
606 * iovec are identical, yielding the same in-core layout and alignment
607 */
608 msg->msg_iov = (struct iovec *)vec;
609 msg->msg_iovlen = num;
610 result = sock_sendmsg(sock, msg, size);
611 set_fs(oldfs);
612 return result;
613}
614EXPORT_SYMBOL(kernel_sendmsg);
615
616static int ktime2ts(ktime_t kt, struct timespec *ts)
617{
618 if (kt.tv64) {
619 *ts = ktime_to_timespec(kt);
620 return 1;
621 } else {
622 return 0;
623 }
624}
625
626/*
627 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
628 */
629void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
630 struct sk_buff *skb)
631{
632 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
633 struct timespec ts[3];
634 int empty = 1;
635 struct skb_shared_hwtstamps *shhwtstamps =
636 skb_hwtstamps(skb);
637
638 /* Race occurred between timestamp enabling and packet
639 receiving. Fill in the current time for now. */
640 if (need_software_tstamp && skb->tstamp.tv64 == 0)
641 __net_timestamp(skb);
642
643 if (need_software_tstamp) {
644 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
645 struct timeval tv;
646 skb_get_timestamp(skb, &tv);
647 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
648 sizeof(tv), &tv);
649 } else {
650 skb_get_timestampns(skb, &ts[0]);
651 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
652 sizeof(ts[0]), &ts[0]);
653 }
654 }
655
656
657 memset(ts, 0, sizeof(ts));
658 if (skb->tstamp.tv64 &&
659 sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
660 skb_get_timestampns(skb, ts + 0);
661 empty = 0;
662 }
663 if (shhwtstamps) {
664 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
665 ktime2ts(shhwtstamps->syststamp, ts + 1))
666 empty = 0;
667 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
668 ktime2ts(shhwtstamps->hwtstamp, ts + 2))
669 empty = 0;
670 }
671 if (!empty)
672 put_cmsg(msg, SOL_SOCKET,
673 SCM_TIMESTAMPING, sizeof(ts), &ts);
674}
675EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
676
677static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
678 struct sk_buff *skb)
679{
680 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
681 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
682 sizeof(__u32), &skb->dropcount);
683}
684
685void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
686 struct sk_buff *skb)
687{
688 sock_recv_timestamp(msg, sk, skb);
689 sock_recv_drops(msg, sk, skb);
690}
691EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
692
693static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
694 struct msghdr *msg, size_t size, int flags)
695{
696 struct sock_iocb *si = kiocb_to_siocb(iocb);
697
698 sock_update_classid(sock->sk);
699
700 si->sock = sock;
701 si->scm = NULL;
702 si->msg = msg;
703 si->size = size;
704 si->flags = flags;
705
706 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
707}
708
709static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
710 struct msghdr *msg, size_t size, int flags)
711{
712 int err = security_socket_recvmsg(sock, msg, size, flags);
713
714 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
715}
716
717int sock_recvmsg(struct socket *sock, struct msghdr *msg,
718 size_t size, int flags)
719{
720 struct kiocb iocb;
721 struct sock_iocb siocb;
722 int ret;
723
724 init_sync_kiocb(&iocb, NULL);
725 iocb.private = &siocb;
726 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
727 if (-EIOCBQUEUED == ret)
728 ret = wait_on_sync_kiocb(&iocb);
729 return ret;
730}
731EXPORT_SYMBOL(sock_recvmsg);
732
733static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
734 size_t size, int flags)
735{
736 struct kiocb iocb;
737 struct sock_iocb siocb;
738 int ret;
739
740 init_sync_kiocb(&iocb, NULL);
741 iocb.private = &siocb;
742 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
743 if (-EIOCBQUEUED == ret)
744 ret = wait_on_sync_kiocb(&iocb);
745 return ret;
746}
747
748/**
749 * kernel_recvmsg - Receive a message from a socket (kernel space)
750 * @sock: The socket to receive the message from
751 * @msg: Received message
752 * @vec: Input s/g array for message data
753 * @num: Size of input s/g array
754 * @size: Number of bytes to read
755 * @flags: Message flags (MSG_DONTWAIT, etc...)
756 *
757 * On return the msg structure contains the scatter/gather array passed in the
758 * vec argument. The array is modified so that it consists of the unfilled
759 * portion of the original array.
760 *
761 * The returned value is the total number of bytes received, or an error.
762 */
763int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
764 struct kvec *vec, size_t num, size_t size, int flags)
765{
766 mm_segment_t oldfs = get_fs();
767 int result;
768
769 set_fs(KERNEL_DS);
770 /*
771 * the following is safe, since for compiler definitions of kvec and
772 * iovec are identical, yielding the same in-core layout and alignment
773 */
774 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
775 result = sock_recvmsg(sock, msg, size, flags);
776 set_fs(oldfs);
777 return result;
778}
779EXPORT_SYMBOL(kernel_recvmsg);
780
781static void sock_aio_dtor(struct kiocb *iocb)
782{
783 kfree(iocb->private);
784}
785
786static ssize_t sock_sendpage(struct file *file, struct page *page,
787 int offset, size_t size, loff_t *ppos, int more)
788{
789 struct socket *sock;
790 int flags;
791
792 sock = file->private_data;
793
794 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
795 if (more)
796 flags |= MSG_MORE;
797
798 return kernel_sendpage(sock, page, offset, size, flags);
799}
800
801static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
802 struct pipe_inode_info *pipe, size_t len,
803 unsigned int flags)
804{
805 struct socket *sock = file->private_data;
806
807 if (unlikely(!sock->ops->splice_read))
808 return -EINVAL;
809
810 sock_update_classid(sock->sk);
811
812 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
813}
814
815static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
816 struct sock_iocb *siocb)
817{
818 if (!is_sync_kiocb(iocb)) {
819 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
820 if (!siocb)
821 return NULL;
822 iocb->ki_dtor = sock_aio_dtor;
823 }
824
825 siocb->kiocb = iocb;
826 iocb->private = siocb;
827 return siocb;
828}
829
830static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
831 struct file *file, const struct iovec *iov,
832 unsigned long nr_segs)
833{
834 struct socket *sock = file->private_data;
835 size_t size = 0;
836 int i;
837
838 for (i = 0; i < nr_segs; i++)
839 size += iov[i].iov_len;
840
841 msg->msg_name = NULL;
842 msg->msg_namelen = 0;
843 msg->msg_control = NULL;
844 msg->msg_controllen = 0;
845 msg->msg_iov = (struct iovec *)iov;
846 msg->msg_iovlen = nr_segs;
847 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
848
849 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
850}
851
852static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
853 unsigned long nr_segs, loff_t pos)
854{
855 struct sock_iocb siocb, *x;
856
857 if (pos != 0)
858 return -ESPIPE;
859
860 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
861 return 0;
862
863
864 x = alloc_sock_iocb(iocb, &siocb);
865 if (!x)
866 return -ENOMEM;
867 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
868}
869
870static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
871 struct file *file, const struct iovec *iov,
872 unsigned long nr_segs)
873{
874 struct socket *sock = file->private_data;
875 size_t size = 0;
876 int i;
877
878 for (i = 0; i < nr_segs; i++)
879 size += iov[i].iov_len;
880
881 msg->msg_name = NULL;
882 msg->msg_namelen = 0;
883 msg->msg_control = NULL;
884 msg->msg_controllen = 0;
885 msg->msg_iov = (struct iovec *)iov;
886 msg->msg_iovlen = nr_segs;
887 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
888 if (sock->type == SOCK_SEQPACKET)
889 msg->msg_flags |= MSG_EOR;
890
891 return __sock_sendmsg(iocb, sock, msg, size);
892}
893
894static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
895 unsigned long nr_segs, loff_t pos)
896{
897 struct sock_iocb siocb, *x;
898
899 if (pos != 0)
900 return -ESPIPE;
901
902 x = alloc_sock_iocb(iocb, &siocb);
903 if (!x)
904 return -ENOMEM;
905
906 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
907}
908
909/*
910 * Atomic setting of ioctl hooks to avoid race
911 * with module unload.
912 */
913
914static DEFINE_MUTEX(br_ioctl_mutex);
915static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
916
917void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
918{
919 mutex_lock(&br_ioctl_mutex);
920 br_ioctl_hook = hook;
921 mutex_unlock(&br_ioctl_mutex);
922}
923EXPORT_SYMBOL(brioctl_set);
924
925static DEFINE_MUTEX(vlan_ioctl_mutex);
926static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
927
928void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
929{
930 mutex_lock(&vlan_ioctl_mutex);
931 vlan_ioctl_hook = hook;
932 mutex_unlock(&vlan_ioctl_mutex);
933}
934EXPORT_SYMBOL(vlan_ioctl_set);
935
936static DEFINE_MUTEX(dlci_ioctl_mutex);
937static int (*dlci_ioctl_hook) (unsigned int, void __user *);
938
939void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
940{
941 mutex_lock(&dlci_ioctl_mutex);
942 dlci_ioctl_hook = hook;
943 mutex_unlock(&dlci_ioctl_mutex);
944}
945EXPORT_SYMBOL(dlci_ioctl_set);
946
947static long sock_do_ioctl(struct net *net, struct socket *sock,
948 unsigned int cmd, unsigned long arg)
949{
950 int err;
951 void __user *argp = (void __user *)arg;
952
953 err = sock->ops->ioctl(sock, cmd, arg);
954
955 /*
956 * If this ioctl is unknown try to hand it down
957 * to the NIC driver.
958 */
959 if (err == -ENOIOCTLCMD)
960 err = dev_ioctl(net, cmd, argp);
961
962 return err;
963}
964
965/*
966 * With an ioctl, arg may well be a user mode pointer, but we don't know
967 * what to do with it - that's up to the protocol still.
968 */
969
970static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
971{
972 struct socket *sock;
973 struct sock *sk;
974 void __user *argp = (void __user *)arg;
975 int pid, err;
976 struct net *net;
977
978 sock = file->private_data;
979 sk = sock->sk;
980 net = sock_net(sk);
981 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
982 err = dev_ioctl(net, cmd, argp);
983 } else
984#ifdef CONFIG_WEXT_CORE
985 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
986 err = dev_ioctl(net, cmd, argp);
987 } else
988#endif
989 switch (cmd) {
990 case FIOSETOWN:
991 case SIOCSPGRP:
992 err = -EFAULT;
993 if (get_user(pid, (int __user *)argp))
994 break;
995 err = f_setown(sock->file, pid, 1);
996 break;
997 case FIOGETOWN:
998 case SIOCGPGRP:
999 err = put_user(f_getown(sock->file),
1000 (int __user *)argp);
1001 break;
1002 case SIOCGIFBR:
1003 case SIOCSIFBR:
1004 case SIOCBRADDBR:
1005 case SIOCBRDELBR:
1006 err = -ENOPKG;
1007 if (!br_ioctl_hook)
1008 request_module("bridge");
1009
1010 mutex_lock(&br_ioctl_mutex);
1011 if (br_ioctl_hook)
1012 err = br_ioctl_hook(net, cmd, argp);
1013 mutex_unlock(&br_ioctl_mutex);
1014 break;
1015 case SIOCGIFVLAN:
1016 case SIOCSIFVLAN:
1017 err = -ENOPKG;
1018 if (!vlan_ioctl_hook)
1019 request_module("8021q");
1020
1021 mutex_lock(&vlan_ioctl_mutex);
1022 if (vlan_ioctl_hook)
1023 err = vlan_ioctl_hook(net, argp);
1024 mutex_unlock(&vlan_ioctl_mutex);
1025 break;
1026 case SIOCADDDLCI:
1027 case SIOCDELDLCI:
1028 err = -ENOPKG;
1029 if (!dlci_ioctl_hook)
1030 request_module("dlci");
1031
1032 mutex_lock(&dlci_ioctl_mutex);
1033 if (dlci_ioctl_hook)
1034 err = dlci_ioctl_hook(cmd, argp);
1035 mutex_unlock(&dlci_ioctl_mutex);
1036 break;
1037 default:
1038 err = sock_do_ioctl(net, sock, cmd, arg);
1039 break;
1040 }
1041 return err;
1042}
1043
1044int sock_create_lite(int family, int type, int protocol, struct socket **res)
1045{
1046 int err;
1047 struct socket *sock = NULL;
1048
1049 err = security_socket_create(family, type, protocol, 1);
1050 if (err)
1051 goto out;
1052
1053 sock = sock_alloc();
1054 if (!sock) {
1055 err = -ENOMEM;
1056 goto out;
1057 }
1058
1059 sock->type = type;
1060 err = security_socket_post_create(sock, family, type, protocol, 1);
1061 if (err)
1062 goto out_release;
1063
1064out:
1065 *res = sock;
1066 return err;
1067out_release:
1068 sock_release(sock);
1069 sock = NULL;
1070 goto out;
1071}
1072EXPORT_SYMBOL(sock_create_lite);
1073
1074/* No kernel lock held - perfect */
1075static unsigned int sock_poll(struct file *file, poll_table *wait)
1076{
1077 struct socket *sock;
1078
1079 /*
1080 * We can't return errors to poll, so it's either yes or no.
1081 */
1082 sock = file->private_data;
1083 return sock->ops->poll(file, sock, wait);
1084}
1085
1086static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1087{
1088 struct socket *sock = file->private_data;
1089
1090 return sock->ops->mmap(file, sock, vma);
1091}
1092
1093static int sock_close(struct inode *inode, struct file *filp)
1094{
1095 /*
1096 * It was possible the inode is NULL we were
1097 * closing an unfinished socket.
1098 */
1099
1100 if (!inode) {
1101 printk(KERN_DEBUG "sock_close: NULL inode\n");
1102 return 0;
1103 }
1104 sock_release(SOCKET_I(inode));
1105 return 0;
1106}
1107
1108/*
1109 * Update the socket async list
1110 *
1111 * Fasync_list locking strategy.
1112 *
1113 * 1. fasync_list is modified only under process context socket lock
1114 * i.e. under semaphore.
1115 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1116 * or under socket lock
1117 */
1118
1119static int sock_fasync(int fd, struct file *filp, int on)
1120{
1121 struct socket *sock = filp->private_data;
1122 struct sock *sk = sock->sk;
1123 struct socket_wq *wq;
1124
1125 if (sk == NULL)
1126 return -EINVAL;
1127
1128 lock_sock(sk);
1129 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1130 fasync_helper(fd, filp, on, &wq->fasync_list);
1131
1132 if (!wq->fasync_list)
1133 sock_reset_flag(sk, SOCK_FASYNC);
1134 else
1135 sock_set_flag(sk, SOCK_FASYNC);
1136
1137 release_sock(sk);
1138 return 0;
1139}
1140
1141/* This function may be called only under socket lock or callback_lock or rcu_lock */
1142
1143int sock_wake_async(struct socket *sock, int how, int band)
1144{
1145 struct socket_wq *wq;
1146
1147 if (!sock)
1148 return -1;
1149 rcu_read_lock();
1150 wq = rcu_dereference(sock->wq);
1151 if (!wq || !wq->fasync_list) {
1152 rcu_read_unlock();
1153 return -1;
1154 }
1155 switch (how) {
1156 case SOCK_WAKE_WAITD:
1157 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1158 break;
1159 goto call_kill;
1160 case SOCK_WAKE_SPACE:
1161 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1162 break;
1163 /* fall through */
1164 case SOCK_WAKE_IO:
1165call_kill:
1166 kill_fasync(&wq->fasync_list, SIGIO, band);
1167 break;
1168 case SOCK_WAKE_URG:
1169 kill_fasync(&wq->fasync_list, SIGURG, band);
1170 }
1171 rcu_read_unlock();
1172 return 0;
1173}
1174EXPORT_SYMBOL(sock_wake_async);
1175
1176int __sock_create(struct net *net, int family, int type, int protocol,
1177 struct socket **res, int kern)
1178{
1179 int err;
1180 struct socket *sock;
1181 const struct net_proto_family *pf;
1182
1183 /*
1184 * Check protocol is in range
1185 */
1186 if (family < 0 || family >= NPROTO)
1187 return -EAFNOSUPPORT;
1188 if (type < 0 || type >= SOCK_MAX)
1189 return -EINVAL;
1190
1191 /* Compatibility.
1192
1193 This uglymoron is moved from INET layer to here to avoid
1194 deadlock in module load.
1195 */
1196 if (family == PF_INET && type == SOCK_PACKET) {
1197 static int warned;
1198 if (!warned) {
1199 warned = 1;
1200 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1201 current->comm);
1202 }
1203 family = PF_PACKET;
1204 }
1205
1206 err = security_socket_create(family, type, protocol, kern);
1207 if (err)
1208 return err;
1209
1210 /*
1211 * Allocate the socket and allow the family to set things up. if
1212 * the protocol is 0, the family is instructed to select an appropriate
1213 * default.
1214 */
1215 sock = sock_alloc();
1216 if (!sock) {
1217 if (net_ratelimit())
1218 printk(KERN_WARNING "socket: no more sockets\n");
1219 return -ENFILE; /* Not exactly a match, but its the
1220 closest posix thing */
1221 }
1222
1223 sock->type = type;
1224
1225#ifdef CONFIG_MODULES
1226 /* Attempt to load a protocol module if the find failed.
1227 *
1228 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1229 * requested real, full-featured networking support upon configuration.
1230 * Otherwise module support will break!
1231 */
1232 if (rcu_access_pointer(net_families[family]) == NULL)
1233 request_module("net-pf-%d", family);
1234#endif
1235
1236 rcu_read_lock();
1237 pf = rcu_dereference(net_families[family]);
1238 err = -EAFNOSUPPORT;
1239 if (!pf)
1240 goto out_release;
1241
1242 /*
1243 * We will call the ->create function, that possibly is in a loadable
1244 * module, so we have to bump that loadable module refcnt first.
1245 */
1246 if (!try_module_get(pf->owner))
1247 goto out_release;
1248
1249 /* Now protected by module ref count */
1250 rcu_read_unlock();
1251
1252 err = pf->create(net, sock, protocol, kern);
1253 if (err < 0)
1254 goto out_module_put;
1255
1256 /*
1257 * Now to bump the refcnt of the [loadable] module that owns this
1258 * socket at sock_release time we decrement its refcnt.
1259 */
1260 if (!try_module_get(sock->ops->owner))
1261 goto out_module_busy;
1262
1263 /*
1264 * Now that we're done with the ->create function, the [loadable]
1265 * module can have its refcnt decremented
1266 */
1267 module_put(pf->owner);
1268 err = security_socket_post_create(sock, family, type, protocol, kern);
1269 if (err)
1270 goto out_sock_release;
1271 *res = sock;
1272
1273 return 0;
1274
1275out_module_busy:
1276 err = -EAFNOSUPPORT;
1277out_module_put:
1278 sock->ops = NULL;
1279 module_put(pf->owner);
1280out_sock_release:
1281 sock_release(sock);
1282 return err;
1283
1284out_release:
1285 rcu_read_unlock();
1286 goto out_sock_release;
1287}
1288EXPORT_SYMBOL(__sock_create);
1289
1290int sock_create(int family, int type, int protocol, struct socket **res)
1291{
1292 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1293}
1294EXPORT_SYMBOL(sock_create);
1295
1296int sock_create_kern(int family, int type, int protocol, struct socket **res)
1297{
1298 return __sock_create(&init_net, family, type, protocol, res, 1);
1299}
1300EXPORT_SYMBOL(sock_create_kern);
1301
1302SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1303{
1304 int retval;
1305 struct socket *sock;
1306 int flags;
1307
1308 /* Check the SOCK_* constants for consistency. */
1309 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1310 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1311 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1312 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1313
1314 flags = type & ~SOCK_TYPE_MASK;
1315 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1316 return -EINVAL;
1317 type &= SOCK_TYPE_MASK;
1318
1319 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1320 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1321
1322 retval = sock_create(family, type, protocol, &sock);
1323 if (retval < 0)
1324 goto out;
1325
1326 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
1327 if (retval < 0)
1328 goto out_release;
1329
1330out:
1331 /* It may be already another descriptor 8) Not kernel problem. */
1332 return retval;
1333
1334out_release:
1335 sock_release(sock);
1336 return retval;
1337}
1338
1339/*
1340 * Create a pair of connected sockets.
1341 */
1342
1343SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1344 int __user *, usockvec)
1345{
1346 struct socket *sock1, *sock2;
1347 int fd1, fd2, err;
1348 struct file *newfile1, *newfile2;
1349 int flags;
1350
1351 flags = type & ~SOCK_TYPE_MASK;
1352 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1353 return -EINVAL;
1354 type &= SOCK_TYPE_MASK;
1355
1356 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1357 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1358
1359 /*
1360 * Obtain the first socket and check if the underlying protocol
1361 * supports the socketpair call.
1362 */
1363
1364 err = sock_create(family, type, protocol, &sock1);
1365 if (err < 0)
1366 goto out;
1367
1368 err = sock_create(family, type, protocol, &sock2);
1369 if (err < 0)
1370 goto out_release_1;
1371
1372 err = sock1->ops->socketpair(sock1, sock2);
1373 if (err < 0)
1374 goto out_release_both;
1375
1376 fd1 = sock_alloc_file(sock1, &newfile1, flags);
1377 if (unlikely(fd1 < 0)) {
1378 err = fd1;
1379 goto out_release_both;
1380 }
1381
1382 fd2 = sock_alloc_file(sock2, &newfile2, flags);
1383 if (unlikely(fd2 < 0)) {
1384 err = fd2;
1385 fput(newfile1);
1386 put_unused_fd(fd1);
1387 sock_release(sock2);
1388 goto out;
1389 }
1390
1391 audit_fd_pair(fd1, fd2);
1392 fd_install(fd1, newfile1);
1393 fd_install(fd2, newfile2);
1394 /* fd1 and fd2 may be already another descriptors.
1395 * Not kernel problem.
1396 */
1397
1398 err = put_user(fd1, &usockvec[0]);
1399 if (!err)
1400 err = put_user(fd2, &usockvec[1]);
1401 if (!err)
1402 return 0;
1403
1404 sys_close(fd2);
1405 sys_close(fd1);
1406 return err;
1407
1408out_release_both:
1409 sock_release(sock2);
1410out_release_1:
1411 sock_release(sock1);
1412out:
1413 return err;
1414}
1415
1416/*
1417 * Bind a name to a socket. Nothing much to do here since it's
1418 * the protocol's responsibility to handle the local address.
1419 *
1420 * We move the socket address to kernel space before we call
1421 * the protocol layer (having also checked the address is ok).
1422 */
1423
1424SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1425{
1426 struct socket *sock;
1427 struct sockaddr_storage address;
1428 int err, fput_needed;
1429
1430 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1431 if (sock) {
1432 err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
1433 if (err >= 0) {
1434 err = security_socket_bind(sock,
1435 (struct sockaddr *)&address,
1436 addrlen);
1437 if (!err)
1438 err = sock->ops->bind(sock,
1439 (struct sockaddr *)
1440 &address, addrlen);
1441 }
1442 fput_light(sock->file, fput_needed);
1443 }
1444 return err;
1445}
1446
1447/*
1448 * Perform a listen. Basically, we allow the protocol to do anything
1449 * necessary for a listen, and if that works, we mark the socket as
1450 * ready for listening.
1451 */
1452
1453SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1454{
1455 struct socket *sock;
1456 int err, fput_needed;
1457 int somaxconn;
1458
1459 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1460 if (sock) {
1461 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1462 if ((unsigned)backlog > somaxconn)
1463 backlog = somaxconn;
1464
1465 err = security_socket_listen(sock, backlog);
1466 if (!err)
1467 err = sock->ops->listen(sock, backlog);
1468
1469 fput_light(sock->file, fput_needed);
1470 }
1471 return err;
1472}
1473
1474/*
1475 * For accept, we attempt to create a new socket, set up the link
1476 * with the client, wake up the client, then return the new
1477 * connected fd. We collect the address of the connector in kernel
1478 * space and move it to user at the very end. This is unclean because
1479 * we open the socket then return an error.
1480 *
1481 * 1003.1g adds the ability to recvmsg() to query connection pending
1482 * status to recvmsg. We need to add that support in a way thats
1483 * clean when we restucture accept also.
1484 */
1485
1486SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1487 int __user *, upeer_addrlen, int, flags)
1488{
1489 struct socket *sock, *newsock;
1490 struct file *newfile;
1491 int err, len, newfd, fput_needed;
1492 struct sockaddr_storage address;
1493
1494 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1495 return -EINVAL;
1496
1497 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1498 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1499
1500 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1501 if (!sock)
1502 goto out;
1503
1504 err = -ENFILE;
1505 newsock = sock_alloc();
1506 if (!newsock)
1507 goto out_put;
1508
1509 newsock->type = sock->type;
1510 newsock->ops = sock->ops;
1511
1512 /*
1513 * We don't need try_module_get here, as the listening socket (sock)
1514 * has the protocol module (sock->ops->owner) held.
1515 */
1516 __module_get(newsock->ops->owner);
1517
1518 newfd = sock_alloc_file(newsock, &newfile, flags);
1519 if (unlikely(newfd < 0)) {
1520 err = newfd;
1521 sock_release(newsock);
1522 goto out_put;
1523 }
1524
1525 err = security_socket_accept(sock, newsock);
1526 if (err)
1527 goto out_fd;
1528
1529 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1530 if (err < 0)
1531 goto out_fd;
1532
1533 if (upeer_sockaddr) {
1534 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1535 &len, 2) < 0) {
1536 err = -ECONNABORTED;
1537 goto out_fd;
1538 }
1539 err = move_addr_to_user((struct sockaddr *)&address,
1540 len, upeer_sockaddr, upeer_addrlen);
1541 if (err < 0)
1542 goto out_fd;
1543 }
1544
1545 /* File flags are not inherited via accept() unlike another OSes. */
1546
1547 fd_install(newfd, newfile);
1548 err = newfd;
1549
1550out_put:
1551 fput_light(sock->file, fput_needed);
1552out:
1553 return err;
1554out_fd:
1555 fput(newfile);
1556 put_unused_fd(newfd);
1557 goto out_put;
1558}
1559
1560SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1561 int __user *, upeer_addrlen)
1562{
1563 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1564}
1565
1566/*
1567 * Attempt to connect to a socket with the server address. The address
1568 * is in user space so we verify it is OK and move it to kernel space.
1569 *
1570 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1571 * break bindings
1572 *
1573 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1574 * other SEQPACKET protocols that take time to connect() as it doesn't
1575 * include the -EINPROGRESS status for such sockets.
1576 */
1577
1578SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1579 int, addrlen)
1580{
1581 struct socket *sock;
1582 struct sockaddr_storage address;
1583 int err, fput_needed;
1584
1585 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1586 if (!sock)
1587 goto out;
1588 err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
1589 if (err < 0)
1590 goto out_put;
1591
1592 err =
1593 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1594 if (err)
1595 goto out_put;
1596
1597 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1598 sock->file->f_flags);
1599out_put:
1600 fput_light(sock->file, fput_needed);
1601out:
1602 return err;
1603}
1604
1605/*
1606 * Get the local address ('name') of a socket object. Move the obtained
1607 * name to user space.
1608 */
1609
1610SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1611 int __user *, usockaddr_len)
1612{
1613 struct socket *sock;
1614 struct sockaddr_storage address;
1615 int len, err, fput_needed;
1616
1617 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1618 if (!sock)
1619 goto out;
1620
1621 err = security_socket_getsockname(sock);
1622 if (err)
1623 goto out_put;
1624
1625 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1626 if (err)
1627 goto out_put;
1628 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
1629
1630out_put:
1631 fput_light(sock->file, fput_needed);
1632out:
1633 return err;
1634}
1635
1636/*
1637 * Get the remote address ('name') of a socket object. Move the obtained
1638 * name to user space.
1639 */
1640
1641SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1642 int __user *, usockaddr_len)
1643{
1644 struct socket *sock;
1645 struct sockaddr_storage address;
1646 int len, err, fput_needed;
1647
1648 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1649 if (sock != NULL) {
1650 err = security_socket_getpeername(sock);
1651 if (err) {
1652 fput_light(sock->file, fput_needed);
1653 return err;
1654 }
1655
1656 err =
1657 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1658 1);
1659 if (!err)
1660 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
1661 usockaddr_len);
1662 fput_light(sock->file, fput_needed);
1663 }
1664 return err;
1665}
1666
1667/*
1668 * Send a datagram to a given address. We move the address into kernel
1669 * space and check the user space data area is readable before invoking
1670 * the protocol.
1671 */
1672
1673SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1674 unsigned, flags, struct sockaddr __user *, addr,
1675 int, addr_len)
1676{
1677 struct socket *sock;
1678 struct sockaddr_storage address;
1679 int err;
1680 struct msghdr msg;
1681 struct iovec iov;
1682 int fput_needed;
1683
1684 if (len > INT_MAX)
1685 len = INT_MAX;
1686 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1687 if (!sock)
1688 goto out;
1689
1690 iov.iov_base = buff;
1691 iov.iov_len = len;
1692 msg.msg_name = NULL;
1693 msg.msg_iov = &iov;
1694 msg.msg_iovlen = 1;
1695 msg.msg_control = NULL;
1696 msg.msg_controllen = 0;
1697 msg.msg_namelen = 0;
1698 if (addr) {
1699 err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
1700 if (err < 0)
1701 goto out_put;
1702 msg.msg_name = (struct sockaddr *)&address;
1703 msg.msg_namelen = addr_len;
1704 }
1705 if (sock->file->f_flags & O_NONBLOCK)
1706 flags |= MSG_DONTWAIT;
1707 msg.msg_flags = flags;
1708 err = sock_sendmsg(sock, &msg, len);
1709
1710out_put:
1711 fput_light(sock->file, fput_needed);
1712out:
1713 return err;
1714}
1715
1716/*
1717 * Send a datagram down a socket.
1718 */
1719
1720SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1721 unsigned, flags)
1722{
1723 return sys_sendto(fd, buff, len, flags, NULL, 0);
1724}
1725
1726/*
1727 * Receive a frame from the socket and optionally record the address of the
1728 * sender. We verify the buffers are writable and if needed move the
1729 * sender address from kernel to user space.
1730 */
1731
1732SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1733 unsigned, flags, struct sockaddr __user *, addr,
1734 int __user *, addr_len)
1735{
1736 struct socket *sock;
1737 struct iovec iov;
1738 struct msghdr msg;
1739 struct sockaddr_storage address;
1740 int err, err2;
1741 int fput_needed;
1742
1743 if (size > INT_MAX)
1744 size = INT_MAX;
1745 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1746 if (!sock)
1747 goto out;
1748
1749 msg.msg_control = NULL;
1750 msg.msg_controllen = 0;
1751 msg.msg_iovlen = 1;
1752 msg.msg_iov = &iov;
1753 iov.iov_len = size;
1754 iov.iov_base = ubuf;
1755 msg.msg_name = (struct sockaddr *)&address;
1756 msg.msg_namelen = sizeof(address);
1757 if (sock->file->f_flags & O_NONBLOCK)
1758 flags |= MSG_DONTWAIT;
1759 err = sock_recvmsg(sock, &msg, size, flags);
1760
1761 if (err >= 0 && addr != NULL) {
1762 err2 = move_addr_to_user((struct sockaddr *)&address,
1763 msg.msg_namelen, addr, addr_len);
1764 if (err2 < 0)
1765 err = err2;
1766 }
1767
1768 fput_light(sock->file, fput_needed);
1769out:
1770 return err;
1771}
1772
1773/*
1774 * Receive a datagram from a socket.
1775 */
1776
1777asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1778 unsigned flags)
1779{
1780 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1781}
1782
1783/*
1784 * Set a socket option. Because we don't know the option lengths we have
1785 * to pass the user mode parameter for the protocols to sort out.
1786 */
1787
1788SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1789 char __user *, optval, int, optlen)
1790{
1791 int err, fput_needed;
1792 struct socket *sock;
1793
1794 if (optlen < 0)
1795 return -EINVAL;
1796
1797 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1798 if (sock != NULL) {
1799 err = security_socket_setsockopt(sock, level, optname);
1800 if (err)
1801 goto out_put;
1802
1803 if (level == SOL_SOCKET)
1804 err =
1805 sock_setsockopt(sock, level, optname, optval,
1806 optlen);
1807 else
1808 err =
1809 sock->ops->setsockopt(sock, level, optname, optval,
1810 optlen);
1811out_put:
1812 fput_light(sock->file, fput_needed);
1813 }
1814 return err;
1815}
1816
1817/*
1818 * Get a socket option. Because we don't know the option lengths we have
1819 * to pass a user mode parameter for the protocols to sort out.
1820 */
1821
1822SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1823 char __user *, optval, int __user *, optlen)
1824{
1825 int err, fput_needed;
1826 struct socket *sock;
1827
1828 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1829 if (sock != NULL) {
1830 err = security_socket_getsockopt(sock, level, optname);
1831 if (err)
1832 goto out_put;
1833
1834 if (level == SOL_SOCKET)
1835 err =
1836 sock_getsockopt(sock, level, optname, optval,
1837 optlen);
1838 else
1839 err =
1840 sock->ops->getsockopt(sock, level, optname, optval,
1841 optlen);
1842out_put:
1843 fput_light(sock->file, fput_needed);
1844 }
1845 return err;
1846}
1847
1848/*
1849 * Shutdown a socket.
1850 */
1851
1852SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1853{
1854 int err, fput_needed;
1855 struct socket *sock;
1856
1857 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1858 if (sock != NULL) {
1859 err = security_socket_shutdown(sock, how);
1860 if (!err)
1861 err = sock->ops->shutdown(sock, how);
1862 fput_light(sock->file, fput_needed);
1863 }
1864 return err;
1865}
1866
1867/* A couple of helpful macros for getting the address of the 32/64 bit
1868 * fields which are the same type (int / unsigned) on our platforms.
1869 */
1870#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1871#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1872#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1873
1874struct used_address {
1875 struct sockaddr_storage name;
1876 unsigned int name_len;
1877};
1878
1879static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
1880 struct msghdr *msg_sys, unsigned flags,
1881 struct used_address *used_address)
1882{
1883 struct compat_msghdr __user *msg_compat =
1884 (struct compat_msghdr __user *)msg;
1885 struct sockaddr_storage address;
1886 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1887 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1888 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1889 /* 20 is size of ipv6_pktinfo */
1890 unsigned char *ctl_buf = ctl;
1891 int err, ctl_len, iov_size, total_len;
1892
1893 err = -EFAULT;
1894 if (MSG_CMSG_COMPAT & flags) {
1895 if (get_compat_msghdr(msg_sys, msg_compat))
1896 return -EFAULT;
1897 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
1898 return -EFAULT;
1899
1900 /* do not move before msg_sys is valid */
1901 err = -EMSGSIZE;
1902 if (msg_sys->msg_iovlen > UIO_MAXIOV)
1903 goto out;
1904
1905 /* Check whether to allocate the iovec area */
1906 err = -ENOMEM;
1907 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
1908 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
1909 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1910 if (!iov)
1911 goto out;
1912 }
1913
1914 /* This will also move the address data into kernel space */
1915 if (MSG_CMSG_COMPAT & flags) {
1916 err = verify_compat_iovec(msg_sys, iov,
1917 (struct sockaddr *)&address,
1918 VERIFY_READ);
1919 } else
1920 err = verify_iovec(msg_sys, iov,
1921 (struct sockaddr *)&address,
1922 VERIFY_READ);
1923 if (err < 0)
1924 goto out_freeiov;
1925 total_len = err;
1926
1927 err = -ENOBUFS;
1928
1929 if (msg_sys->msg_controllen > INT_MAX)
1930 goto out_freeiov;
1931 ctl_len = msg_sys->msg_controllen;
1932 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1933 err =
1934 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
1935 sizeof(ctl));
1936 if (err)
1937 goto out_freeiov;
1938 ctl_buf = msg_sys->msg_control;
1939 ctl_len = msg_sys->msg_controllen;
1940 } else if (ctl_len) {
1941 if (ctl_len > sizeof(ctl)) {
1942 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1943 if (ctl_buf == NULL)
1944 goto out_freeiov;
1945 }
1946 err = -EFAULT;
1947 /*
1948 * Careful! Before this, msg_sys->msg_control contains a user pointer.
1949 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1950 * checking falls down on this.
1951 */
1952 if (copy_from_user(ctl_buf,
1953 (void __user __force *)msg_sys->msg_control,
1954 ctl_len))
1955 goto out_freectl;
1956 msg_sys->msg_control = ctl_buf;
1957 }
1958 msg_sys->msg_flags = flags;
1959
1960 if (sock->file->f_flags & O_NONBLOCK)
1961 msg_sys->msg_flags |= MSG_DONTWAIT;
1962 /*
1963 * If this is sendmmsg() and current destination address is same as
1964 * previously succeeded address, omit asking LSM's decision.
1965 * used_address->name_len is initialized to UINT_MAX so that the first
1966 * destination address never matches.
1967 */
1968 if (used_address && msg_sys->msg_name &&
1969 used_address->name_len == msg_sys->msg_namelen &&
1970 !memcmp(&used_address->name, msg_sys->msg_name,
1971 used_address->name_len)) {
1972 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
1973 goto out_freectl;
1974 }
1975 err = sock_sendmsg(sock, msg_sys, total_len);
1976 /*
1977 * If this is sendmmsg() and sending to current destination address was
1978 * successful, remember it.
1979 */
1980 if (used_address && err >= 0) {
1981 used_address->name_len = msg_sys->msg_namelen;
1982 if (msg_sys->msg_name)
1983 memcpy(&used_address->name, msg_sys->msg_name,
1984 used_address->name_len);
1985 }
1986
1987out_freectl:
1988 if (ctl_buf != ctl)
1989 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1990out_freeiov:
1991 if (iov != iovstack)
1992 sock_kfree_s(sock->sk, iov, iov_size);
1993out:
1994 return err;
1995}
1996
1997/*
1998 * BSD sendmsg interface
1999 */
2000
2001SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
2002{
2003 int fput_needed, err;
2004 struct msghdr msg_sys;
2005 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2006
2007 if (!sock)
2008 goto out;
2009
2010 err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2011
2012 fput_light(sock->file, fput_needed);
2013out:
2014 return err;
2015}
2016
2017/*
2018 * Linux sendmmsg interface
2019 */
2020
2021int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2022 unsigned int flags)
2023{
2024 int fput_needed, err, datagrams;
2025 struct socket *sock;
2026 struct mmsghdr __user *entry;
2027 struct compat_mmsghdr __user *compat_entry;
2028 struct msghdr msg_sys;
2029 struct used_address used_address;
2030
2031 if (vlen > UIO_MAXIOV)
2032 vlen = UIO_MAXIOV;
2033
2034 datagrams = 0;
2035
2036 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2037 if (!sock)
2038 return err;
2039
2040 used_address.name_len = UINT_MAX;
2041 entry = mmsg;
2042 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2043 err = 0;
2044
2045 while (datagrams < vlen) {
2046 if (MSG_CMSG_COMPAT & flags) {
2047 err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2048 &msg_sys, flags, &used_address);
2049 if (err < 0)
2050 break;
2051 err = __put_user(err, &compat_entry->msg_len);
2052 ++compat_entry;
2053 } else {
2054 err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
2055 &msg_sys, flags, &used_address);
2056 if (err < 0)
2057 break;
2058 err = put_user(err, &entry->msg_len);
2059 ++entry;
2060 }
2061
2062 if (err)
2063 break;
2064 ++datagrams;
2065 }
2066
2067 fput_light(sock->file, fput_needed);
2068
2069 /* We only return an error if no datagrams were able to be sent */
2070 if (datagrams != 0)
2071 return datagrams;
2072
2073 return err;
2074}
2075
2076SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2077 unsigned int, vlen, unsigned int, flags)
2078{
2079 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2080}
2081
2082static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2083 struct msghdr *msg_sys, unsigned flags, int nosec)
2084{
2085 struct compat_msghdr __user *msg_compat =
2086 (struct compat_msghdr __user *)msg;
2087 struct iovec iovstack[UIO_FASTIOV];
2088 struct iovec *iov = iovstack;
2089 unsigned long cmsg_ptr;
2090 int err, iov_size, total_len, len;
2091
2092 /* kernel mode address */
2093 struct sockaddr_storage addr;
2094
2095 /* user mode address pointers */
2096 struct sockaddr __user *uaddr;
2097 int __user *uaddr_len;
2098
2099 if (MSG_CMSG_COMPAT & flags) {
2100 if (get_compat_msghdr(msg_sys, msg_compat))
2101 return -EFAULT;
2102 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
2103 return -EFAULT;
2104
2105 err = -EMSGSIZE;
2106 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2107 goto out;
2108
2109 /* Check whether to allocate the iovec area */
2110 err = -ENOMEM;
2111 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
2112 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2113 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
2114 if (!iov)
2115 goto out;
2116 }
2117
2118 /*
2119 * Save the user-mode address (verify_iovec will change the
2120 * kernel msghdr to use the kernel address space)
2121 */
2122
2123 uaddr = (__force void __user *)msg_sys->msg_name;
2124 uaddr_len = COMPAT_NAMELEN(msg);
2125 if (MSG_CMSG_COMPAT & flags) {
2126 err = verify_compat_iovec(msg_sys, iov,
2127 (struct sockaddr *)&addr,
2128 VERIFY_WRITE);
2129 } else
2130 err = verify_iovec(msg_sys, iov,
2131 (struct sockaddr *)&addr,
2132 VERIFY_WRITE);
2133 if (err < 0)
2134 goto out_freeiov;
2135 total_len = err;
2136
2137 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2138 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2139
2140 if (sock->file->f_flags & O_NONBLOCK)
2141 flags |= MSG_DONTWAIT;
2142 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2143 total_len, flags);
2144 if (err < 0)
2145 goto out_freeiov;
2146 len = err;
2147
2148 if (uaddr != NULL) {
2149 err = move_addr_to_user((struct sockaddr *)&addr,
2150 msg_sys->msg_namelen, uaddr,
2151 uaddr_len);
2152 if (err < 0)
2153 goto out_freeiov;
2154 }
2155 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2156 COMPAT_FLAGS(msg));
2157 if (err)
2158 goto out_freeiov;
2159 if (MSG_CMSG_COMPAT & flags)
2160 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2161 &msg_compat->msg_controllen);
2162 else
2163 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2164 &msg->msg_controllen);
2165 if (err)
2166 goto out_freeiov;
2167 err = len;
2168
2169out_freeiov:
2170 if (iov != iovstack)
2171 sock_kfree_s(sock->sk, iov, iov_size);
2172out:
2173 return err;
2174}
2175
2176/*
2177 * BSD recvmsg interface
2178 */
2179
2180SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2181 unsigned int, flags)
2182{
2183 int fput_needed, err;
2184 struct msghdr msg_sys;
2185 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2186
2187 if (!sock)
2188 goto out;
2189
2190 err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2191
2192 fput_light(sock->file, fput_needed);
2193out:
2194 return err;
2195}
2196
2197/*
2198 * Linux recvmmsg interface
2199 */
2200
2201int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2202 unsigned int flags, struct timespec *timeout)
2203{
2204 int fput_needed, err, datagrams;
2205 struct socket *sock;
2206 struct mmsghdr __user *entry;
2207 struct compat_mmsghdr __user *compat_entry;
2208 struct msghdr msg_sys;
2209 struct timespec end_time;
2210
2211 if (timeout &&
2212 poll_select_set_timeout(&end_time, timeout->tv_sec,
2213 timeout->tv_nsec))
2214 return -EINVAL;
2215
2216 datagrams = 0;
2217
2218 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2219 if (!sock)
2220 return err;
2221
2222 err = sock_error(sock->sk);
2223 if (err)
2224 goto out_put;
2225
2226 entry = mmsg;
2227 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2228
2229 while (datagrams < vlen) {
2230 /*
2231 * No need to ask LSM for more than the first datagram.
2232 */
2233 if (MSG_CMSG_COMPAT & flags) {
2234 err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2235 &msg_sys, flags & ~MSG_WAITFORONE,
2236 datagrams);
2237 if (err < 0)
2238 break;
2239 err = __put_user(err, &compat_entry->msg_len);
2240 ++compat_entry;
2241 } else {
2242 err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
2243 &msg_sys, flags & ~MSG_WAITFORONE,
2244 datagrams);
2245 if (err < 0)
2246 break;
2247 err = put_user(err, &entry->msg_len);
2248 ++entry;
2249 }
2250
2251 if (err)
2252 break;
2253 ++datagrams;
2254
2255 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2256 if (flags & MSG_WAITFORONE)
2257 flags |= MSG_DONTWAIT;
2258
2259 if (timeout) {
2260 ktime_get_ts(timeout);
2261 *timeout = timespec_sub(end_time, *timeout);
2262 if (timeout->tv_sec < 0) {
2263 timeout->tv_sec = timeout->tv_nsec = 0;
2264 break;
2265 }
2266
2267 /* Timeout, return less than vlen datagrams */
2268 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2269 break;
2270 }
2271
2272 /* Out of band data, return right away */
2273 if (msg_sys.msg_flags & MSG_OOB)
2274 break;
2275 }
2276
2277out_put:
2278 fput_light(sock->file, fput_needed);
2279
2280 if (err == 0)
2281 return datagrams;
2282
2283 if (datagrams != 0) {
2284 /*
2285 * We may return less entries than requested (vlen) if the
2286 * sock is non block and there aren't enough datagrams...
2287 */
2288 if (err != -EAGAIN) {
2289 /*
2290 * ... or if recvmsg returns an error after we
2291 * received some datagrams, where we record the
2292 * error to return on the next call or if the
2293 * app asks about it using getsockopt(SO_ERROR).
2294 */
2295 sock->sk->sk_err = -err;
2296 }
2297
2298 return datagrams;
2299 }
2300
2301 return err;
2302}
2303
2304SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2305 unsigned int, vlen, unsigned int, flags,
2306 struct timespec __user *, timeout)
2307{
2308 int datagrams;
2309 struct timespec timeout_sys;
2310
2311 if (!timeout)
2312 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2313
2314 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2315 return -EFAULT;
2316
2317 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2318
2319 if (datagrams > 0 &&
2320 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2321 datagrams = -EFAULT;
2322
2323 return datagrams;
2324}
2325
2326#ifdef __ARCH_WANT_SYS_SOCKETCALL
2327/* Argument list sizes for sys_socketcall */
2328#define AL(x) ((x) * sizeof(unsigned long))
2329static const unsigned char nargs[21] = {
2330 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2331 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2332 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2333 AL(4), AL(5), AL(4)
2334};
2335
2336#undef AL
2337
2338/*
2339 * System call vectors.
2340 *
2341 * Argument checking cleaned up. Saved 20% in size.
2342 * This function doesn't need to set the kernel lock because
2343 * it is set by the callees.
2344 */
2345
2346SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2347{
2348 unsigned long a[6];
2349 unsigned long a0, a1;
2350 int err;
2351 unsigned int len;
2352
2353 if (call < 1 || call > SYS_SENDMMSG)
2354 return -EINVAL;
2355
2356 len = nargs[call];
2357 if (len > sizeof(a))
2358 return -EINVAL;
2359
2360 /* copy_from_user should be SMP safe. */
2361 if (copy_from_user(a, args, len))
2362 return -EFAULT;
2363
2364 audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2365
2366 a0 = a[0];
2367 a1 = a[1];
2368
2369 switch (call) {
2370 case SYS_SOCKET:
2371 err = sys_socket(a0, a1, a[2]);
2372 break;
2373 case SYS_BIND:
2374 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2375 break;
2376 case SYS_CONNECT:
2377 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2378 break;
2379 case SYS_LISTEN:
2380 err = sys_listen(a0, a1);
2381 break;
2382 case SYS_ACCEPT:
2383 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2384 (int __user *)a[2], 0);
2385 break;
2386 case SYS_GETSOCKNAME:
2387 err =
2388 sys_getsockname(a0, (struct sockaddr __user *)a1,
2389 (int __user *)a[2]);
2390 break;
2391 case SYS_GETPEERNAME:
2392 err =
2393 sys_getpeername(a0, (struct sockaddr __user *)a1,
2394 (int __user *)a[2]);
2395 break;
2396 case SYS_SOCKETPAIR:
2397 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2398 break;
2399 case SYS_SEND:
2400 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2401 break;
2402 case SYS_SENDTO:
2403 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2404 (struct sockaddr __user *)a[4], a[5]);
2405 break;
2406 case SYS_RECV:
2407 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2408 break;
2409 case SYS_RECVFROM:
2410 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2411 (struct sockaddr __user *)a[4],
2412 (int __user *)a[5]);
2413 break;
2414 case SYS_SHUTDOWN:
2415 err = sys_shutdown(a0, a1);
2416 break;
2417 case SYS_SETSOCKOPT:
2418 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2419 break;
2420 case SYS_GETSOCKOPT:
2421 err =
2422 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2423 (int __user *)a[4]);
2424 break;
2425 case SYS_SENDMSG:
2426 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2427 break;
2428 case SYS_SENDMMSG:
2429 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2430 break;
2431 case SYS_RECVMSG:
2432 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2433 break;
2434 case SYS_RECVMMSG:
2435 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2436 (struct timespec __user *)a[4]);
2437 break;
2438 case SYS_ACCEPT4:
2439 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2440 (int __user *)a[2], a[3]);
2441 break;
2442 default:
2443 err = -EINVAL;
2444 break;
2445 }
2446 return err;
2447}
2448
2449#endif /* __ARCH_WANT_SYS_SOCKETCALL */
2450
2451/**
2452 * sock_register - add a socket protocol handler
2453 * @ops: description of protocol
2454 *
2455 * This function is called by a protocol handler that wants to
2456 * advertise its address family, and have it linked into the
2457 * socket interface. The value ops->family coresponds to the
2458 * socket system call protocol family.
2459 */
2460int sock_register(const struct net_proto_family *ops)
2461{
2462 int err;
2463
2464 if (ops->family >= NPROTO) {
2465 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2466 NPROTO);
2467 return -ENOBUFS;
2468 }
2469
2470 spin_lock(&net_family_lock);
2471 if (rcu_dereference_protected(net_families[ops->family],
2472 lockdep_is_held(&net_family_lock)))
2473 err = -EEXIST;
2474 else {
2475 rcu_assign_pointer(net_families[ops->family], ops);
2476 err = 0;
2477 }
2478 spin_unlock(&net_family_lock);
2479
2480 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
2481 return err;
2482}
2483EXPORT_SYMBOL(sock_register);
2484
2485/**
2486 * sock_unregister - remove a protocol handler
2487 * @family: protocol family to remove
2488 *
2489 * This function is called by a protocol handler that wants to
2490 * remove its address family, and have it unlinked from the
2491 * new socket creation.
2492 *
2493 * If protocol handler is a module, then it can use module reference
2494 * counts to protect against new references. If protocol handler is not
2495 * a module then it needs to provide its own protection in
2496 * the ops->create routine.
2497 */
2498void sock_unregister(int family)
2499{
2500 BUG_ON(family < 0 || family >= NPROTO);
2501
2502 spin_lock(&net_family_lock);
2503 rcu_assign_pointer(net_families[family], NULL);
2504 spin_unlock(&net_family_lock);
2505
2506 synchronize_rcu();
2507
2508 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
2509}
2510EXPORT_SYMBOL(sock_unregister);
2511
2512static int __init sock_init(void)
2513{
2514 int err;
2515
2516 /*
2517 * Initialize sock SLAB cache.
2518 */
2519
2520 sk_init();
2521
2522 /*
2523 * Initialize skbuff SLAB cache
2524 */
2525 skb_init();
2526
2527 /*
2528 * Initialize the protocols module.
2529 */
2530
2531 init_inodecache();
2532
2533 err = register_filesystem(&sock_fs_type);
2534 if (err)
2535 goto out_fs;
2536 sock_mnt = kern_mount(&sock_fs_type);
2537 if (IS_ERR(sock_mnt)) {
2538 err = PTR_ERR(sock_mnt);
2539 goto out_mount;
2540 }
2541
2542 /* The real protocol initialization is performed in later initcalls.
2543 */
2544
2545#ifdef CONFIG_NETFILTER
2546 netfilter_init();
2547#endif
2548
2549#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
2550 skb_timestamping_init();
2551#endif
2552
2553out:
2554 return err;
2555
2556out_mount:
2557 unregister_filesystem(&sock_fs_type);
2558out_fs:
2559 goto out;
2560}
2561
2562core_initcall(sock_init); /* early initcall */
2563
2564#ifdef CONFIG_PROC_FS
2565void socket_seq_show(struct seq_file *seq)
2566{
2567 int cpu;
2568 int counter = 0;
2569
2570 for_each_possible_cpu(cpu)
2571 counter += per_cpu(sockets_in_use, cpu);
2572
2573 /* It can be negative, by the way. 8) */
2574 if (counter < 0)
2575 counter = 0;
2576
2577 seq_printf(seq, "sockets: used %d\n", counter);
2578}
2579#endif /* CONFIG_PROC_FS */
2580
2581#ifdef CONFIG_COMPAT
2582static int do_siocgstamp(struct net *net, struct socket *sock,
2583 unsigned int cmd, struct compat_timeval __user *up)
2584{
2585 mm_segment_t old_fs = get_fs();
2586 struct timeval ktv;
2587 int err;
2588
2589 set_fs(KERNEL_DS);
2590 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2591 set_fs(old_fs);
2592 if (!err) {
2593 err = put_user(ktv.tv_sec, &up->tv_sec);
2594 err |= __put_user(ktv.tv_usec, &up->tv_usec);
2595 }
2596 return err;
2597}
2598
2599static int do_siocgstampns(struct net *net, struct socket *sock,
2600 unsigned int cmd, struct compat_timespec __user *up)
2601{
2602 mm_segment_t old_fs = get_fs();
2603 struct timespec kts;
2604 int err;
2605
2606 set_fs(KERNEL_DS);
2607 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2608 set_fs(old_fs);
2609 if (!err) {
2610 err = put_user(kts.tv_sec, &up->tv_sec);
2611 err |= __put_user(kts.tv_nsec, &up->tv_nsec);
2612 }
2613 return err;
2614}
2615
2616static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2617{
2618 struct ifreq __user *uifr;
2619 int err;
2620
2621 uifr = compat_alloc_user_space(sizeof(struct ifreq));
2622 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2623 return -EFAULT;
2624
2625 err = dev_ioctl(net, SIOCGIFNAME, uifr);
2626 if (err)
2627 return err;
2628
2629 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2630 return -EFAULT;
2631
2632 return 0;
2633}
2634
2635static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2636{
2637 struct compat_ifconf ifc32;
2638 struct ifconf ifc;
2639 struct ifconf __user *uifc;
2640 struct compat_ifreq __user *ifr32;
2641 struct ifreq __user *ifr;
2642 unsigned int i, j;
2643 int err;
2644
2645 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2646 return -EFAULT;
2647
2648 if (ifc32.ifcbuf == 0) {
2649 ifc32.ifc_len = 0;
2650 ifc.ifc_len = 0;
2651 ifc.ifc_req = NULL;
2652 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2653 } else {
2654 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2655 sizeof(struct ifreq);
2656 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2657 ifc.ifc_len = len;
2658 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2659 ifr32 = compat_ptr(ifc32.ifcbuf);
2660 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2661 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2662 return -EFAULT;
2663 ifr++;
2664 ifr32++;
2665 }
2666 }
2667 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2668 return -EFAULT;
2669
2670 err = dev_ioctl(net, SIOCGIFCONF, uifc);
2671 if (err)
2672 return err;
2673
2674 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2675 return -EFAULT;
2676
2677 ifr = ifc.ifc_req;
2678 ifr32 = compat_ptr(ifc32.ifcbuf);
2679 for (i = 0, j = 0;
2680 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2681 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2682 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2683 return -EFAULT;
2684 ifr32++;
2685 ifr++;
2686 }
2687
2688 if (ifc32.ifcbuf == 0) {
2689 /* Translate from 64-bit structure multiple to
2690 * a 32-bit one.
2691 */
2692 i = ifc.ifc_len;
2693 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2694 ifc32.ifc_len = i;
2695 } else {
2696 ifc32.ifc_len = i;
2697 }
2698 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2699 return -EFAULT;
2700
2701 return 0;
2702}
2703
2704static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2705{
2706 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2707 bool convert_in = false, convert_out = false;
2708 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2709 struct ethtool_rxnfc __user *rxnfc;
2710 struct ifreq __user *ifr;
2711 u32 rule_cnt = 0, actual_rule_cnt;
2712 u32 ethcmd;
2713 u32 data;
2714 int ret;
2715
2716 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2717 return -EFAULT;
2718
2719 compat_rxnfc = compat_ptr(data);
2720
2721 if (get_user(ethcmd, &compat_rxnfc->cmd))
2722 return -EFAULT;
2723
2724 /* Most ethtool structures are defined without padding.
2725 * Unfortunately struct ethtool_rxnfc is an exception.
2726 */
2727 switch (ethcmd) {
2728 default:
2729 break;
2730 case ETHTOOL_GRXCLSRLALL:
2731 /* Buffer size is variable */
2732 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2733 return -EFAULT;
2734 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2735 return -ENOMEM;
2736 buf_size += rule_cnt * sizeof(u32);
2737 /* fall through */
2738 case ETHTOOL_GRXRINGS:
2739 case ETHTOOL_GRXCLSRLCNT:
2740 case ETHTOOL_GRXCLSRULE:
2741 convert_out = true;
2742 /* fall through */
2743 case ETHTOOL_SRXCLSRLDEL:
2744 case ETHTOOL_SRXCLSRLINS:
2745 buf_size += sizeof(struct ethtool_rxnfc);
2746 convert_in = true;
2747 break;
2748 }
2749
2750 ifr = compat_alloc_user_space(buf_size);
2751 rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);
2752
2753 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2754 return -EFAULT;
2755
2756 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2757 &ifr->ifr_ifru.ifru_data))
2758 return -EFAULT;
2759
2760 if (convert_in) {
2761 /* We expect there to be holes between fs.m_ext and
2762 * fs.ring_cookie and at the end of fs, but nowhere else.
2763 */
2764 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2765 sizeof(compat_rxnfc->fs.m_ext) !=
2766 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2767 sizeof(rxnfc->fs.m_ext));
2768 BUILD_BUG_ON(
2769 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2770 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2771 offsetof(struct ethtool_rxnfc, fs.location) -
2772 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2773
2774 if (copy_in_user(rxnfc, compat_rxnfc,
2775 (void *)(&rxnfc->fs.m_ext + 1) -
2776 (void *)rxnfc) ||
2777 copy_in_user(&rxnfc->fs.ring_cookie,
2778 &compat_rxnfc->fs.ring_cookie,
2779 (void *)(&rxnfc->fs.location + 1) -
2780 (void *)&rxnfc->fs.ring_cookie) ||
2781 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2782 sizeof(rxnfc->rule_cnt)))
2783 return -EFAULT;
2784 }
2785
2786 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2787 if (ret)
2788 return ret;
2789
2790 if (convert_out) {
2791 if (copy_in_user(compat_rxnfc, rxnfc,
2792 (const void *)(&rxnfc->fs.m_ext + 1) -
2793 (const void *)rxnfc) ||
2794 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2795 &rxnfc->fs.ring_cookie,
2796 (const void *)(&rxnfc->fs.location + 1) -
2797 (const void *)&rxnfc->fs.ring_cookie) ||
2798 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2799 sizeof(rxnfc->rule_cnt)))
2800 return -EFAULT;
2801
2802 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2803 /* As an optimisation, we only copy the actual
2804 * number of rules that the underlying
2805 * function returned. Since Mallory might
2806 * change the rule count in user memory, we
2807 * check that it is less than the rule count
2808 * originally given (as the user buffer size),
2809 * which has been range-checked.
2810 */
2811 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2812 return -EFAULT;
2813 if (actual_rule_cnt < rule_cnt)
2814 rule_cnt = actual_rule_cnt;
2815 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2816 &rxnfc->rule_locs[0],
2817 rule_cnt * sizeof(u32)))
2818 return -EFAULT;
2819 }
2820 }
2821
2822 return 0;
2823}
2824
2825static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2826{
2827 void __user *uptr;
2828 compat_uptr_t uptr32;
2829 struct ifreq __user *uifr;
2830
2831 uifr = compat_alloc_user_space(sizeof(*uifr));
2832 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2833 return -EFAULT;
2834
2835 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2836 return -EFAULT;
2837
2838 uptr = compat_ptr(uptr32);
2839
2840 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2841 return -EFAULT;
2842
2843 return dev_ioctl(net, SIOCWANDEV, uifr);
2844}
2845
2846static int bond_ioctl(struct net *net, unsigned int cmd,
2847 struct compat_ifreq __user *ifr32)
2848{
2849 struct ifreq kifr;
2850 struct ifreq __user *uifr;
2851 mm_segment_t old_fs;
2852 int err;
2853 u32 data;
2854 void __user *datap;
2855
2856 switch (cmd) {
2857 case SIOCBONDENSLAVE:
2858 case SIOCBONDRELEASE:
2859 case SIOCBONDSETHWADDR:
2860 case SIOCBONDCHANGEACTIVE:
2861 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2862 return -EFAULT;
2863
2864 old_fs = get_fs();
2865 set_fs(KERNEL_DS);
2866 err = dev_ioctl(net, cmd,
2867 (struct ifreq __user __force *) &kifr);
2868 set_fs(old_fs);
2869
2870 return err;
2871 case SIOCBONDSLAVEINFOQUERY:
2872 case SIOCBONDINFOQUERY:
2873 uifr = compat_alloc_user_space(sizeof(*uifr));
2874 if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2875 return -EFAULT;
2876
2877 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2878 return -EFAULT;
2879
2880 datap = compat_ptr(data);
2881 if (put_user(datap, &uifr->ifr_ifru.ifru_data))
2882 return -EFAULT;
2883
2884 return dev_ioctl(net, cmd, uifr);
2885 default:
2886 return -EINVAL;
2887 }
2888}
2889
2890static int siocdevprivate_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 /* Don't check these user accesses, just let that get trapped
2908 * in the ioctl handler instead.
2909 */
2910 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2911 IFNAMSIZ))
2912 return -EFAULT;
2913 if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
2914 return -EFAULT;
2915
2916 return dev_ioctl(net, cmd, u_ifreq64);
2917}
2918
2919static int dev_ifsioc(struct net *net, struct socket *sock,
2920 unsigned int cmd, struct compat_ifreq __user *uifr32)
2921{
2922 struct ifreq __user *uifr;
2923 int err;
2924
2925 uifr = compat_alloc_user_space(sizeof(*uifr));
2926 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2927 return -EFAULT;
2928
2929 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2930
2931 if (!err) {
2932 switch (cmd) {
2933 case SIOCGIFFLAGS:
2934 case SIOCGIFMETRIC:
2935 case SIOCGIFMTU:
2936 case SIOCGIFMEM:
2937 case SIOCGIFHWADDR:
2938 case SIOCGIFINDEX:
2939 case SIOCGIFADDR:
2940 case SIOCGIFBRDADDR:
2941 case SIOCGIFDSTADDR:
2942 case SIOCGIFNETMASK:
2943 case SIOCGIFPFLAGS:
2944 case SIOCGIFTXQLEN:
2945 case SIOCGMIIPHY:
2946 case SIOCGMIIREG:
2947 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
2948 err = -EFAULT;
2949 break;
2950 }
2951 }
2952 return err;
2953}
2954
2955static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2956 struct compat_ifreq __user *uifr32)
2957{
2958 struct ifreq ifr;
2959 struct compat_ifmap __user *uifmap32;
2960 mm_segment_t old_fs;
2961 int err;
2962
2963 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2964 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
2965 err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2966 err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2967 err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2968 err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
2969 err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
2970 err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
2971 if (err)
2972 return -EFAULT;
2973
2974 old_fs = get_fs();
2975 set_fs(KERNEL_DS);
2976 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
2977 set_fs(old_fs);
2978
2979 if (cmd == SIOCGIFMAP && !err) {
2980 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
2981 err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2982 err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2983 err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2984 err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
2985 err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
2986 err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
2987 if (err)
2988 err = -EFAULT;
2989 }
2990 return err;
2991}
2992
2993static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
2994{
2995 void __user *uptr;
2996 compat_uptr_t uptr32;
2997 struct ifreq __user *uifr;
2998
2999 uifr = compat_alloc_user_space(sizeof(*uifr));
3000 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
3001 return -EFAULT;
3002
3003 if (get_user(uptr32, &uifr32->ifr_data))
3004 return -EFAULT;
3005
3006 uptr = compat_ptr(uptr32);
3007
3008 if (put_user(uptr, &uifr->ifr_data))
3009 return -EFAULT;
3010
3011 return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
3012}
3013
3014struct rtentry32 {
3015 u32 rt_pad1;
3016 struct sockaddr rt_dst; /* target address */
3017 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3018 struct sockaddr rt_genmask; /* target network mask (IP) */
3019 unsigned short rt_flags;
3020 short rt_pad2;
3021 u32 rt_pad3;
3022 unsigned char rt_tos;
3023 unsigned char rt_class;
3024 short rt_pad4;
3025 short rt_metric; /* +1 for binary compatibility! */
3026 /* char * */ u32 rt_dev; /* forcing the device at add */
3027 u32 rt_mtu; /* per route MTU/Window */
3028 u32 rt_window; /* Window clamping */
3029 unsigned short rt_irtt; /* Initial RTT */
3030};
3031
3032struct in6_rtmsg32 {
3033 struct in6_addr rtmsg_dst;
3034 struct in6_addr rtmsg_src;
3035 struct in6_addr rtmsg_gateway;
3036 u32 rtmsg_type;
3037 u16 rtmsg_dst_len;
3038 u16 rtmsg_src_len;
3039 u32 rtmsg_metric;
3040 u32 rtmsg_info;
3041 u32 rtmsg_flags;
3042 s32 rtmsg_ifindex;
3043};
3044
3045static int routing_ioctl(struct net *net, struct socket *sock,
3046 unsigned int cmd, void __user *argp)
3047{
3048 int ret;
3049 void *r = NULL;
3050 struct in6_rtmsg r6;
3051 struct rtentry r4;
3052 char devname[16];
3053 u32 rtdev;
3054 mm_segment_t old_fs = get_fs();
3055
3056 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3057 struct in6_rtmsg32 __user *ur6 = argp;
3058 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3059 3 * sizeof(struct in6_addr));
3060 ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3061 ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3062 ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3063 ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3064 ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3065 ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3066 ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3067
3068 r = (void *) &r6;
3069 } else { /* ipv4 */
3070 struct rtentry32 __user *ur4 = argp;
3071 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3072 3 * sizeof(struct sockaddr));
3073 ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
3074 ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
3075 ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
3076 ret |= __get_user(r4.rt_window, &(ur4->rt_window));
3077 ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
3078 ret |= __get_user(rtdev, &(ur4->rt_dev));
3079 if (rtdev) {
3080 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3081 r4.rt_dev = (char __user __force *)devname;
3082 devname[15] = 0;
3083 } else
3084 r4.rt_dev = NULL;
3085
3086 r = (void *) &r4;
3087 }
3088
3089 if (ret) {
3090 ret = -EFAULT;
3091 goto out;
3092 }
3093
3094 set_fs(KERNEL_DS);
3095 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3096 set_fs(old_fs);
3097
3098out:
3099 return ret;
3100}
3101
3102/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3103 * for some operations; this forces use of the newer bridge-utils that
3104 * use compatible ioctls
3105 */
3106static int old_bridge_ioctl(compat_ulong_t __user *argp)
3107{
3108 compat_ulong_t tmp;
3109
3110 if (get_user(tmp, argp))
3111 return -EFAULT;
3112 if (tmp == BRCTL_GET_VERSION)
3113 return BRCTL_VERSION + 1;
3114 return -EINVAL;
3115}
3116
3117static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3118 unsigned int cmd, unsigned long arg)
3119{
3120 void __user *argp = compat_ptr(arg);
3121 struct sock *sk = sock->sk;
3122 struct net *net = sock_net(sk);
3123
3124 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3125 return siocdevprivate_ioctl(net, cmd, argp);
3126
3127 switch (cmd) {
3128 case SIOCSIFBR:
3129 case SIOCGIFBR:
3130 return old_bridge_ioctl(argp);
3131 case SIOCGIFNAME:
3132 return dev_ifname32(net, argp);
3133 case SIOCGIFCONF:
3134 return dev_ifconf(net, argp);
3135 case SIOCETHTOOL:
3136 return ethtool_ioctl(net, argp);
3137 case SIOCWANDEV:
3138 return compat_siocwandev(net, argp);
3139 case SIOCGIFMAP:
3140 case SIOCSIFMAP:
3141 return compat_sioc_ifmap(net, cmd, argp);
3142 case SIOCBONDENSLAVE:
3143 case SIOCBONDRELEASE:
3144 case SIOCBONDSETHWADDR:
3145 case SIOCBONDSLAVEINFOQUERY:
3146 case SIOCBONDINFOQUERY:
3147 case SIOCBONDCHANGEACTIVE:
3148 return bond_ioctl(net, cmd, argp);
3149 case SIOCADDRT:
3150 case SIOCDELRT:
3151 return routing_ioctl(net, sock, cmd, argp);
3152 case SIOCGSTAMP:
3153 return do_siocgstamp(net, sock, cmd, argp);
3154 case SIOCGSTAMPNS:
3155 return do_siocgstampns(net, sock, cmd, argp);
3156 case SIOCSHWTSTAMP:
3157 return compat_siocshwtstamp(net, argp);
3158
3159 case FIOSETOWN:
3160 case SIOCSPGRP:
3161 case FIOGETOWN:
3162 case SIOCGPGRP:
3163 case SIOCBRADDBR:
3164 case SIOCBRDELBR:
3165 case SIOCGIFVLAN:
3166 case SIOCSIFVLAN:
3167 case SIOCADDDLCI:
3168 case SIOCDELDLCI:
3169 return sock_ioctl(file, cmd, arg);
3170
3171 case SIOCGIFFLAGS:
3172 case SIOCSIFFLAGS:
3173 case SIOCGIFMETRIC:
3174 case SIOCSIFMETRIC:
3175 case SIOCGIFMTU:
3176 case SIOCSIFMTU:
3177 case SIOCGIFMEM:
3178 case SIOCSIFMEM:
3179 case SIOCGIFHWADDR:
3180 case SIOCSIFHWADDR:
3181 case SIOCADDMULTI:
3182 case SIOCDELMULTI:
3183 case SIOCGIFINDEX:
3184 case SIOCGIFADDR:
3185 case SIOCSIFADDR:
3186 case SIOCSIFHWBROADCAST:
3187 case SIOCDIFADDR:
3188 case SIOCGIFBRDADDR:
3189 case SIOCSIFBRDADDR:
3190 case SIOCGIFDSTADDR:
3191 case SIOCSIFDSTADDR:
3192 case SIOCGIFNETMASK:
3193 case SIOCSIFNETMASK:
3194 case SIOCSIFPFLAGS:
3195 case SIOCGIFPFLAGS:
3196 case SIOCGIFTXQLEN:
3197 case SIOCSIFTXQLEN:
3198 case SIOCBRADDIF:
3199 case SIOCBRDELIF:
3200 case SIOCSIFNAME:
3201 case SIOCGMIIPHY:
3202 case SIOCGMIIREG:
3203 case SIOCSMIIREG:
3204 return dev_ifsioc(net, sock, cmd, argp);
3205
3206 case SIOCSARP:
3207 case SIOCGARP:
3208 case SIOCDARP:
3209 case SIOCATMARK:
3210 return sock_do_ioctl(net, sock, cmd, arg);
3211 }
3212
3213 /* Prevent warning from compat_sys_ioctl, these always
3214 * result in -EINVAL in the native case anyway. */
3215 switch (cmd) {
3216 case SIOCRTMSG:
3217 case SIOCGIFCOUNT:
3218 case SIOCSRARP:
3219 case SIOCGRARP:
3220 case SIOCDRARP:
3221 case SIOCSIFLINK:
3222 case SIOCGIFSLAVE:
3223 case SIOCSIFSLAVE:
3224 return -EINVAL;
3225 }
3226
3227 return -ENOIOCTLCMD;
3228}
3229
3230static long compat_sock_ioctl(struct file *file, unsigned cmd,
3231 unsigned long arg)
3232{
3233 struct socket *sock = file->private_data;
3234 int ret = -ENOIOCTLCMD;
3235 struct sock *sk;
3236 struct net *net;
3237
3238 sk = sock->sk;
3239 net = sock_net(sk);
3240
3241 if (sock->ops->compat_ioctl)
3242 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3243
3244 if (ret == -ENOIOCTLCMD &&
3245 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3246 ret = compat_wext_handle_ioctl(net, cmd, arg);
3247
3248 if (ret == -ENOIOCTLCMD)
3249 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3250
3251 return ret;
3252}
3253#endif
3254
3255int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3256{
3257 return sock->ops->bind(sock, addr, addrlen);
3258}
3259EXPORT_SYMBOL(kernel_bind);
3260
3261int kernel_listen(struct socket *sock, int backlog)
3262{
3263 return sock->ops->listen(sock, backlog);
3264}
3265EXPORT_SYMBOL(kernel_listen);
3266
3267int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3268{
3269 struct sock *sk = sock->sk;
3270 int err;
3271
3272 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3273 newsock);
3274 if (err < 0)
3275 goto done;
3276
3277 err = sock->ops->accept(sock, *newsock, flags);
3278 if (err < 0) {
3279 sock_release(*newsock);
3280 *newsock = NULL;
3281 goto done;
3282 }
3283
3284 (*newsock)->ops = sock->ops;
3285 __module_get((*newsock)->ops->owner);
3286
3287done:
3288 return err;
3289}
3290EXPORT_SYMBOL(kernel_accept);
3291
3292int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3293 int flags)
3294{
3295 return sock->ops->connect(sock, addr, addrlen, flags);
3296}
3297EXPORT_SYMBOL(kernel_connect);
3298
3299int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3300 int *addrlen)
3301{
3302 return sock->ops->getname(sock, addr, addrlen, 0);
3303}
3304EXPORT_SYMBOL(kernel_getsockname);
3305
3306int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3307 int *addrlen)
3308{
3309 return sock->ops->getname(sock, addr, addrlen, 1);
3310}
3311EXPORT_SYMBOL(kernel_getpeername);
3312
3313int kernel_getsockopt(struct socket *sock, int level, int optname,
3314 char *optval, int *optlen)
3315{
3316 mm_segment_t oldfs = get_fs();
3317 char __user *uoptval;
3318 int __user *uoptlen;
3319 int err;
3320
3321 uoptval = (char __user __force *) optval;
3322 uoptlen = (int __user __force *) optlen;
3323
3324 set_fs(KERNEL_DS);
3325 if (level == SOL_SOCKET)
3326 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3327 else
3328 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3329 uoptlen);
3330 set_fs(oldfs);
3331 return err;
3332}
3333EXPORT_SYMBOL(kernel_getsockopt);
3334
3335int kernel_setsockopt(struct socket *sock, int level, int optname,
3336 char *optval, unsigned int optlen)
3337{
3338 mm_segment_t oldfs = get_fs();
3339 char __user *uoptval;
3340 int err;
3341
3342 uoptval = (char __user __force *) optval;
3343
3344 set_fs(KERNEL_DS);
3345 if (level == SOL_SOCKET)
3346 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3347 else
3348 err = sock->ops->setsockopt(sock, level, optname, uoptval,
3349 optlen);
3350 set_fs(oldfs);
3351 return err;
3352}
3353EXPORT_SYMBOL(kernel_setsockopt);
3354
3355int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3356 size_t size, int flags)
3357{
3358 sock_update_classid(sock->sk);
3359
3360 if (sock->ops->sendpage)
3361 return sock->ops->sendpage(sock, page, offset, size, flags);
3362
3363 return sock_no_sendpage(sock, page, offset, size, flags);
3364}
3365EXPORT_SYMBOL(kernel_sendpage);
3366
3367int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3368{
3369 mm_segment_t oldfs = get_fs();
3370 int err;
3371
3372 set_fs(KERNEL_DS);
3373 err = sock->ops->ioctl(sock, cmd, arg);
3374 set_fs(oldfs);
3375
3376 return err;
3377}
3378EXPORT_SYMBOL(kernel_sock_ioctl);
3379
3380int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3381{
3382 return sock->ops->shutdown(sock, how);
3383}
3384EXPORT_SYMBOL(kernel_sock_shutdown);