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

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