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

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