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Linux/net/socket.c

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

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