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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/rcupdate.h>
67#include <linux/netdevice.h>
68#include <linux/proc_fs.h>
69#include <linux/seq_file.h>
70#include <linux/mutex.h>
71#include <linux/wanrouter.h>
72#include <linux/if_bridge.h>
73#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
75#include <linux/init.h>
76#include <linux/poll.h>
77#include <linux/cache.h>
78#include <linux/module.h>
79#include <linux/highmem.h>
80#include <linux/mount.h>
81#include <linux/security.h>
82#include <linux/syscalls.h>
83#include <linux/compat.h>
84#include <linux/kmod.h>
85#include <linux/audit.h>
86#include <linux/wireless.h>
87#include <linux/nsproxy.h>
88
89#include <asm/uaccess.h>
90#include <asm/unistd.h>
91
92#include <net/compat.h>
93
94#include <net/sock.h>
95#include <linux/netfilter.h>
96
97static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
98static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
99 unsigned long nr_segs, loff_t pos);
100static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
101 unsigned long nr_segs, loff_t pos);
102static int sock_mmap(struct file *file, struct vm_area_struct *vma);
103
104static int sock_close(struct inode *inode, struct file *file);
105static unsigned int sock_poll(struct file *file,
106 struct poll_table_struct *wait);
107static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
108#ifdef CONFIG_COMPAT
109static long compat_sock_ioctl(struct file *file,
110 unsigned int cmd, unsigned long arg);
111#endif
112static int sock_fasync(int fd, struct file *filp, int on);
113static ssize_t sock_sendpage(struct file *file, struct page *page,
114 int offset, size_t size, loff_t *ppos, int more);
115
116
117
118
119
120
121static const struct file_operations socket_file_ops = {
122 .owner = THIS_MODULE,
123 .llseek = no_llseek,
124 .aio_read = sock_aio_read,
125 .aio_write = sock_aio_write,
126 .poll = sock_poll,
127 .unlocked_ioctl = sock_ioctl,
128#ifdef CONFIG_COMPAT
129 .compat_ioctl = compat_sock_ioctl,
130#endif
131 .mmap = sock_mmap,
132 .open = sock_no_open,
133 .release = sock_close,
134 .fasync = sock_fasync,
135 .sendpage = sock_sendpage,
136 .splice_write = generic_splice_sendpage,
137};
138
139
140
141
142
143static DEFINE_SPINLOCK(net_family_lock);
144static const struct net_proto_family *net_families[NPROTO] __read_mostly;
145
146
147
148
149
150static DEFINE_PER_CPU(int, sockets_in_use) = 0;
151
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154
155
156
157
158#define MAX_SOCK_ADDR 128
159
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177
178int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
179{
180 if (ulen < 0 || ulen > MAX_SOCK_ADDR)
181 return -EINVAL;
182 if (ulen == 0)
183 return 0;
184 if (copy_from_user(kaddr, uaddr, ulen))
185 return -EFAULT;
186 return audit_sockaddr(ulen, kaddr);
187}
188
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204
205
206int move_addr_to_user(void *kaddr, int klen, void __user *uaddr,
207 int __user *ulen)
208{
209 int err;
210 int len;
211
212 err = get_user(len, ulen);
213 if (err)
214 return err;
215 if (len > klen)
216 len = klen;
217 if (len < 0 || len > MAX_SOCK_ADDR)
218 return -EINVAL;
219 if (len) {
220 if (audit_sockaddr(klen, kaddr))
221 return -ENOMEM;
222 if (copy_to_user(uaddr, kaddr, len))
223 return -EFAULT;
224 }
225
226
227
228
229 return __put_user(klen, ulen);
230}
231
232#define SOCKFS_MAGIC 0x534F434B
233
234static struct kmem_cache *sock_inode_cachep __read_mostly;
235
236static struct inode *sock_alloc_inode(struct super_block *sb)
237{
238 struct socket_alloc *ei;
239
240 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
241 if (!ei)
242 return NULL;
243 init_waitqueue_head(&ei->socket.wait);
244
245 ei->socket.fasync_list = NULL;
246 ei->socket.state = SS_UNCONNECTED;
247 ei->socket.flags = 0;
248 ei->socket.ops = NULL;
249 ei->socket.sk = NULL;
250 ei->socket.file = NULL;
251
252 return &ei->vfs_inode;
253}
254
255static void sock_destroy_inode(struct inode *inode)
256{
257 kmem_cache_free(sock_inode_cachep,
258 container_of(inode, struct socket_alloc, vfs_inode));
259}
260
261static void init_once(struct kmem_cache *cachep, void *foo)
262{
263 struct socket_alloc *ei = (struct socket_alloc *)foo;
264
265 inode_init_once(&ei->vfs_inode);
266}
267
268static int init_inodecache(void)
269{
270 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
271 sizeof(struct socket_alloc),
272 0,
273 (SLAB_HWCACHE_ALIGN |
274 SLAB_RECLAIM_ACCOUNT |
275 SLAB_MEM_SPREAD),
276 init_once);
277 if (sock_inode_cachep == NULL)
278 return -ENOMEM;
279 return 0;
280}
281
282static struct super_operations sockfs_ops = {
283 .alloc_inode = sock_alloc_inode,
284 .destroy_inode =sock_destroy_inode,
285 .statfs = simple_statfs,
286};
287
288static int sockfs_get_sb(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *data,
290 struct vfsmount *mnt)
291{
292 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
293 mnt);
294}
295
296static struct vfsmount *sock_mnt __read_mostly;
297
298static struct file_system_type sock_fs_type = {
299 .name = "sockfs",
300 .get_sb = sockfs_get_sb,
301 .kill_sb = kill_anon_super,
302};
303
304static int sockfs_delete_dentry(struct dentry *dentry)
305{
306
307
308
309
310
311
312 dentry->d_flags |= DCACHE_UNHASHED;
313 return 0;
314}
315
316
317
318
319static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
320{
321 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
322 dentry->d_inode->i_ino);
323}
324
325static struct dentry_operations sockfs_dentry_operations = {
326 .d_delete = sockfs_delete_dentry,
327 .d_dname = sockfs_dname,
328};
329
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345
346
347static int sock_alloc_fd(struct file **filep)
348{
349 int fd;
350
351 fd = get_unused_fd();
352 if (likely(fd >= 0)) {
353 struct file *file = get_empty_filp();
354
355 *filep = file;
356 if (unlikely(!file)) {
357 put_unused_fd(fd);
358 return -ENFILE;
359 }
360 } else
361 *filep = NULL;
362 return fd;
363}
364
365static int sock_attach_fd(struct socket *sock, struct file *file)
366{
367 struct dentry *dentry;
368 struct qstr name = { .name = "" };
369
370 dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
371 if (unlikely(!dentry))
372 return -ENOMEM;
373
374 dentry->d_op = &sockfs_dentry_operations;
375
376
377
378
379
380 dentry->d_flags &= ~DCACHE_UNHASHED;
381 d_instantiate(dentry, SOCK_INODE(sock));
382
383 sock->file = file;
384 init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE,
385 &socket_file_ops);
386 SOCK_INODE(sock)->i_fop = &socket_file_ops;
387 file->f_flags = O_RDWR;
388 file->f_pos = 0;
389 file->private_data = sock;
390
391 return 0;
392}
393
394int sock_map_fd(struct socket *sock)
395{
396 struct file *newfile;
397 int fd = sock_alloc_fd(&newfile);
398
399 if (likely(fd >= 0)) {
400 int err = sock_attach_fd(sock, newfile);
401
402 if (unlikely(err < 0)) {
403 put_filp(newfile);
404 put_unused_fd(fd);
405 return err;
406 }
407 fd_install(fd, newfile);
408 }
409 return fd;
410}
411
412static struct socket *sock_from_file(struct file *file, int *err)
413{
414 if (file->f_op == &socket_file_ops)
415 return file->private_data;
416
417 *err = -ENOTSOCK;
418 return NULL;
419}
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432
433
434struct socket *sockfd_lookup(int fd, int *err)
435{
436 struct file *file;
437 struct socket *sock;
438
439 file = fget(fd);
440 if (!file) {
441 *err = -EBADF;
442 return NULL;
443 }
444
445 sock = sock_from_file(file, err);
446 if (!sock)
447 fput(file);
448 return sock;
449}
450
451static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
452{
453 struct file *file;
454 struct socket *sock;
455
456 *err = -EBADF;
457 file = fget_light(fd, fput_needed);
458 if (file) {
459 sock = sock_from_file(file, err);
460 if (sock)
461 return sock;
462 fput_light(file, *fput_needed);
463 }
464 return NULL;
465}
466
467
468
469
470
471
472
473
474
475static struct socket *sock_alloc(void)
476{
477 struct inode *inode;
478 struct socket *sock;
479
480 inode = new_inode(sock_mnt->mnt_sb);
481 if (!inode)
482 return NULL;
483
484 sock = SOCKET_I(inode);
485
486 inode->i_mode = S_IFSOCK | S_IRWXUGO;
487 inode->i_uid = current->fsuid;
488 inode->i_gid = current->fsgid;
489
490 get_cpu_var(sockets_in_use)++;
491 put_cpu_var(sockets_in_use);
492 return sock;
493}
494
495
496
497
498
499
500
501static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
502{
503 return -ENXIO;
504}
505
506const struct file_operations bad_sock_fops = {
507 .owner = THIS_MODULE,
508 .open = sock_no_open,
509};
510
511
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518
519
520void sock_release(struct socket *sock)
521{
522 if (sock->ops) {
523 struct module *owner = sock->ops->owner;
524
525 sock->ops->release(sock);
526 sock->ops = NULL;
527 module_put(owner);
528 }
529
530 if (sock->fasync_list)
531 printk(KERN_ERR "sock_release: fasync list not empty!\n");
532
533 get_cpu_var(sockets_in_use)--;
534 put_cpu_var(sockets_in_use);
535 if (!sock->file) {
536 iput(SOCK_INODE(sock));
537 return;
538 }
539 sock->file = NULL;
540}
541
542static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
543 struct msghdr *msg, size_t size)
544{
545 struct sock_iocb *si = kiocb_to_siocb(iocb);
546 int err;
547
548 si->sock = sock;
549 si->scm = NULL;
550 si->msg = msg;
551 si->size = size;
552
553 err = security_socket_sendmsg(sock, msg, size);
554 if (err)
555 return err;
556
557 return sock->ops->sendmsg(iocb, sock, msg, size);
558}
559
560int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
561{
562 struct kiocb iocb;
563 struct sock_iocb siocb;
564 int ret;
565
566 init_sync_kiocb(&iocb, NULL);
567 iocb.private = &siocb;
568 ret = __sock_sendmsg(&iocb, sock, msg, size);
569 if (-EIOCBQUEUED == ret)
570 ret = wait_on_sync_kiocb(&iocb);
571 return ret;
572}
573
574int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
575 struct kvec *vec, size_t num, size_t size)
576{
577 mm_segment_t oldfs = get_fs();
578 int result;
579
580 set_fs(KERNEL_DS);
581
582
583
584
585 msg->msg_iov = (struct iovec *)vec;
586 msg->msg_iovlen = num;
587 result = sock_sendmsg(sock, msg, size);
588 set_fs(oldfs);
589 return result;
590}
591
592
593
594
595void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
596 struct sk_buff *skb)
597{
598 ktime_t kt = skb->tstamp;
599
600 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
601 struct timeval tv;
602
603
604 if (kt.tv64 == 0)
605 kt = ktime_get_real();
606 skb->tstamp = kt;
607 tv = ktime_to_timeval(kt);
608 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv);
609 } else {
610 struct timespec ts;
611
612
613 if (kt.tv64 == 0)
614 kt = ktime_get_real();
615 skb->tstamp = kt;
616 ts = ktime_to_timespec(kt);
617 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts);
618 }
619}
620
621EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
622
623static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
624 struct msghdr *msg, size_t size, int flags)
625{
626 int err;
627 struct sock_iocb *si = kiocb_to_siocb(iocb);
628
629 si->sock = sock;
630 si->scm = NULL;
631 si->msg = msg;
632 si->size = size;
633 si->flags = flags;
634
635 err = security_socket_recvmsg(sock, msg, size, flags);
636 if (err)
637 return err;
638
639 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
640}
641
642int sock_recvmsg(struct socket *sock, struct msghdr *msg,
643 size_t size, int flags)
644{
645 struct kiocb iocb;
646 struct sock_iocb siocb;
647 int ret;
648
649 init_sync_kiocb(&iocb, NULL);
650 iocb.private = &siocb;
651 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
652 if (-EIOCBQUEUED == ret)
653 ret = wait_on_sync_kiocb(&iocb);
654 return ret;
655}
656
657int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
658 struct kvec *vec, size_t num, size_t size, int flags)
659{
660 mm_segment_t oldfs = get_fs();
661 int result;
662
663 set_fs(KERNEL_DS);
664
665
666
667
668 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
669 result = sock_recvmsg(sock, msg, size, flags);
670 set_fs(oldfs);
671 return result;
672}
673
674static void sock_aio_dtor(struct kiocb *iocb)
675{
676 kfree(iocb->private);
677}
678
679static ssize_t sock_sendpage(struct file *file, struct page *page,
680 int offset, size_t size, loff_t *ppos, int more)
681{
682 struct socket *sock;
683 int flags;
684
685 sock = file->private_data;
686
687 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
688 if (more)
689 flags |= MSG_MORE;
690
691 return sock->ops->sendpage(sock, page, offset, size, flags);
692}
693
694static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
695 struct sock_iocb *siocb)
696{
697 if (!is_sync_kiocb(iocb)) {
698 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
699 if (!siocb)
700 return NULL;
701 iocb->ki_dtor = sock_aio_dtor;
702 }
703
704 siocb->kiocb = iocb;
705 iocb->private = siocb;
706 return siocb;
707}
708
709static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
710 struct file *file, const struct iovec *iov,
711 unsigned long nr_segs)
712{
713 struct socket *sock = file->private_data;
714 size_t size = 0;
715 int i;
716
717 for (i = 0; i < nr_segs; i++)
718 size += iov[i].iov_len;
719
720 msg->msg_name = NULL;
721 msg->msg_namelen = 0;
722 msg->msg_control = NULL;
723 msg->msg_controllen = 0;
724 msg->msg_iov = (struct iovec *)iov;
725 msg->msg_iovlen = nr_segs;
726 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
727
728 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
729}
730
731static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
732 unsigned long nr_segs, loff_t pos)
733{
734 struct sock_iocb siocb, *x;
735
736 if (pos != 0)
737 return -ESPIPE;
738
739 if (iocb->ki_left == 0)
740 return 0;
741
742
743 x = alloc_sock_iocb(iocb, &siocb);
744 if (!x)
745 return -ENOMEM;
746 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
747}
748
749static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
750 struct file *file, const struct iovec *iov,
751 unsigned long nr_segs)
752{
753 struct socket *sock = file->private_data;
754 size_t size = 0;
755 int i;
756
757 for (i = 0; i < nr_segs; i++)
758 size += iov[i].iov_len;
759
760 msg->msg_name = NULL;
761 msg->msg_namelen = 0;
762 msg->msg_control = NULL;
763 msg->msg_controllen = 0;
764 msg->msg_iov = (struct iovec *)iov;
765 msg->msg_iovlen = nr_segs;
766 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
767 if (sock->type == SOCK_SEQPACKET)
768 msg->msg_flags |= MSG_EOR;
769
770 return __sock_sendmsg(iocb, sock, msg, size);
771}
772
773static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
774 unsigned long nr_segs, loff_t pos)
775{
776 struct sock_iocb siocb, *x;
777
778 if (pos != 0)
779 return -ESPIPE;
780
781 x = alloc_sock_iocb(iocb, &siocb);
782 if (!x)
783 return -ENOMEM;
784
785 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
786}
787
788
789
790
791
792
793static DEFINE_MUTEX(br_ioctl_mutex);
794static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL;
795
796void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
797{
798 mutex_lock(&br_ioctl_mutex);
799 br_ioctl_hook = hook;
800 mutex_unlock(&br_ioctl_mutex);
801}
802
803EXPORT_SYMBOL(brioctl_set);
804
805static DEFINE_MUTEX(vlan_ioctl_mutex);
806static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
807
808void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
809{
810 mutex_lock(&vlan_ioctl_mutex);
811 vlan_ioctl_hook = hook;
812 mutex_unlock(&vlan_ioctl_mutex);
813}
814
815EXPORT_SYMBOL(vlan_ioctl_set);
816
817static DEFINE_MUTEX(dlci_ioctl_mutex);
818static int (*dlci_ioctl_hook) (unsigned int, void __user *);
819
820void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
821{
822 mutex_lock(&dlci_ioctl_mutex);
823 dlci_ioctl_hook = hook;
824 mutex_unlock(&dlci_ioctl_mutex);
825}
826
827EXPORT_SYMBOL(dlci_ioctl_set);
828
829
830
831
832
833
834static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
835{
836 struct socket *sock;
837 struct sock *sk;
838 void __user *argp = (void __user *)arg;
839 int pid, err;
840 struct net *net;
841
842 sock = file->private_data;
843 sk = sock->sk;
844 net = sk->sk_net;
845 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
846 err = dev_ioctl(net, cmd, argp);
847 } else
848#ifdef CONFIG_WIRELESS_EXT
849 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
850 err = dev_ioctl(net, cmd, argp);
851 } else
852#endif
853 switch (cmd) {
854 case FIOSETOWN:
855 case SIOCSPGRP:
856 err = -EFAULT;
857 if (get_user(pid, (int __user *)argp))
858 break;
859 err = f_setown(sock->file, pid, 1);
860 break;
861 case FIOGETOWN:
862 case SIOCGPGRP:
863 err = put_user(f_getown(sock->file),
864 (int __user *)argp);
865 break;
866 case SIOCGIFBR:
867 case SIOCSIFBR:
868 case SIOCBRADDBR:
869 case SIOCBRDELBR:
870 err = -ENOPKG;
871 if (!br_ioctl_hook)
872 request_module("bridge");
873
874 mutex_lock(&br_ioctl_mutex);
875 if (br_ioctl_hook)
876 err = br_ioctl_hook(net, cmd, argp);
877 mutex_unlock(&br_ioctl_mutex);
878 break;
879 case SIOCGIFVLAN:
880 case SIOCSIFVLAN:
881 err = -ENOPKG;
882 if (!vlan_ioctl_hook)
883 request_module("8021q");
884
885 mutex_lock(&vlan_ioctl_mutex);
886 if (vlan_ioctl_hook)
887 err = vlan_ioctl_hook(net, argp);
888 mutex_unlock(&vlan_ioctl_mutex);
889 break;
890 case SIOCADDDLCI:
891 case SIOCDELDLCI:
892 err = -ENOPKG;
893 if (!dlci_ioctl_hook)
894 request_module("dlci");
895
896 if (dlci_ioctl_hook) {
897 mutex_lock(&dlci_ioctl_mutex);
898 err = dlci_ioctl_hook(cmd, argp);
899 mutex_unlock(&dlci_ioctl_mutex);
900 }
901 break;
902 default:
903 err = sock->ops->ioctl(sock, cmd, arg);
904
905
906
907
908
909 if (err == -ENOIOCTLCMD)
910 err = dev_ioctl(net, cmd, argp);
911 break;
912 }
913 return err;
914}
915
916int sock_create_lite(int family, int type, int protocol, struct socket **res)
917{
918 int err;
919 struct socket *sock = NULL;
920
921 err = security_socket_create(family, type, protocol, 1);
922 if (err)
923 goto out;
924
925 sock = sock_alloc();
926 if (!sock) {
927 err = -ENOMEM;
928 goto out;
929 }
930
931 sock->type = type;
932 err = security_socket_post_create(sock, family, type, protocol, 1);
933 if (err)
934 goto out_release;
935
936out:
937 *res = sock;
938 return err;
939out_release:
940 sock_release(sock);
941 sock = NULL;
942 goto out;
943}
944
945
946static unsigned int sock_poll(struct file *file, poll_table *wait)
947{
948 struct socket *sock;
949
950
951
952
953 sock = file->private_data;
954 return sock->ops->poll(file, sock, wait);
955}
956
957static int sock_mmap(struct file *file, struct vm_area_struct *vma)
958{
959 struct socket *sock = file->private_data;
960
961 return sock->ops->mmap(file, sock, vma);
962}
963
964static int sock_close(struct inode *inode, struct file *filp)
965{
966
967
968
969
970
971 if (!inode) {
972 printk(KERN_DEBUG "sock_close: NULL inode\n");
973 return 0;
974 }
975 sock_fasync(-1, filp, 0);
976 sock_release(SOCKET_I(inode));
977 return 0;
978}
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995static int sock_fasync(int fd, struct file *filp, int on)
996{
997 struct fasync_struct *fa, *fna = NULL, **prev;
998 struct socket *sock;
999 struct sock *sk;
1000
1001 if (on) {
1002 fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
1003 if (fna == NULL)
1004 return -ENOMEM;
1005 }
1006
1007 sock = filp->private_data;
1008
1009 sk = sock->sk;
1010 if (sk == NULL) {
1011 kfree(fna);
1012 return -EINVAL;
1013 }
1014
1015 lock_sock(sk);
1016
1017 prev = &(sock->fasync_list);
1018
1019 for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev)
1020 if (fa->fa_file == filp)
1021 break;
1022
1023 if (on) {
1024 if (fa != NULL) {
1025 write_lock_bh(&sk->sk_callback_lock);
1026 fa->fa_fd = fd;
1027 write_unlock_bh(&sk->sk_callback_lock);
1028
1029 kfree(fna);
1030 goto out;
1031 }
1032 fna->fa_file = filp;
1033 fna->fa_fd = fd;
1034 fna->magic = FASYNC_MAGIC;
1035 fna->fa_next = sock->fasync_list;
1036 write_lock_bh(&sk->sk_callback_lock);
1037 sock->fasync_list = fna;
1038 write_unlock_bh(&sk->sk_callback_lock);
1039 } else {
1040 if (fa != NULL) {
1041 write_lock_bh(&sk->sk_callback_lock);
1042 *prev = fa->fa_next;
1043 write_unlock_bh(&sk->sk_callback_lock);
1044 kfree(fa);
1045 }
1046 }
1047
1048out:
1049 release_sock(sock->sk);
1050 return 0;
1051}
1052
1053
1054
1055int sock_wake_async(struct socket *sock, int how, int band)
1056{
1057 if (!sock || !sock->fasync_list)
1058 return -1;
1059 switch (how) {
1060 case 1:
1061
1062 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1063 break;
1064 goto call_kill;
1065 case 2:
1066 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1067 break;
1068
1069 case 0:
1070call_kill:
1071 __kill_fasync(sock->fasync_list, SIGIO, band);
1072 break;
1073 case 3:
1074 __kill_fasync(sock->fasync_list, SIGURG, band);
1075 }
1076 return 0;
1077}
1078
1079static int __sock_create(struct net *net, int family, int type, int protocol,
1080 struct socket **res, int kern)
1081{
1082 int err;
1083 struct socket *sock;
1084 const struct net_proto_family *pf;
1085
1086
1087
1088
1089 if (family < 0 || family >= NPROTO)
1090 return -EAFNOSUPPORT;
1091 if (type < 0 || type >= SOCK_MAX)
1092 return -EINVAL;
1093
1094
1095
1096
1097
1098
1099 if (family == PF_INET && type == SOCK_PACKET) {
1100 static int warned;
1101 if (!warned) {
1102 warned = 1;
1103 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1104 current->comm);
1105 }
1106 family = PF_PACKET;
1107 }
1108
1109 err = security_socket_create(family, type, protocol, kern);
1110 if (err)
1111 return err;
1112
1113
1114
1115
1116
1117
1118 sock = sock_alloc();
1119 if (!sock) {
1120 if (net_ratelimit())
1121 printk(KERN_WARNING "socket: no more sockets\n");
1122 return -ENFILE;
1123
1124 }
1125
1126 sock->type = type;
1127
1128#if defined(CONFIG_KMOD)
1129
1130
1131
1132
1133
1134
1135 if (net_families[family] == NULL)
1136 request_module("net-pf-%d", family);
1137#endif
1138
1139 rcu_read_lock();
1140 pf = rcu_dereference(net_families[family]);
1141 err = -EAFNOSUPPORT;
1142 if (!pf)
1143 goto out_release;
1144
1145
1146
1147
1148
1149 if (!try_module_get(pf->owner))
1150 goto out_release;
1151
1152
1153 rcu_read_unlock();
1154
1155 err = pf->create(net, sock, protocol);
1156 if (err < 0)
1157 goto out_module_put;
1158
1159
1160
1161
1162
1163 if (!try_module_get(sock->ops->owner))
1164 goto out_module_busy;
1165
1166
1167
1168
1169
1170 module_put(pf->owner);
1171 err = security_socket_post_create(sock, family, type, protocol, kern);
1172 if (err)
1173 goto out_sock_release;
1174 *res = sock;
1175
1176 return 0;
1177
1178out_module_busy:
1179 err = -EAFNOSUPPORT;
1180out_module_put:
1181 sock->ops = NULL;
1182 module_put(pf->owner);
1183out_sock_release:
1184 sock_release(sock);
1185 return err;
1186
1187out_release:
1188 rcu_read_unlock();
1189 goto out_sock_release;
1190}
1191
1192int sock_create(int family, int type, int protocol, struct socket **res)
1193{
1194 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1195}
1196
1197int sock_create_kern(int family, int type, int protocol, struct socket **res)
1198{
1199 return __sock_create(&init_net, family, type, protocol, res, 1);
1200}
1201
1202asmlinkage long sys_socket(int family, int type, int protocol)
1203{
1204 int retval;
1205 struct socket *sock;
1206
1207 retval = sock_create(family, type, protocol, &sock);
1208 if (retval < 0)
1209 goto out;
1210
1211 retval = sock_map_fd(sock);
1212 if (retval < 0)
1213 goto out_release;
1214
1215out:
1216
1217 return retval;
1218
1219out_release:
1220 sock_release(sock);
1221 return retval;
1222}
1223
1224
1225
1226
1227
1228asmlinkage long sys_socketpair(int family, int type, int protocol,
1229 int __user *usockvec)
1230{
1231 struct socket *sock1, *sock2;
1232 int fd1, fd2, err;
1233 struct file *newfile1, *newfile2;
1234
1235
1236
1237
1238
1239
1240 err = sock_create(family, type, protocol, &sock1);
1241 if (err < 0)
1242 goto out;
1243
1244 err = sock_create(family, type, protocol, &sock2);
1245 if (err < 0)
1246 goto out_release_1;
1247
1248 err = sock1->ops->socketpair(sock1, sock2);
1249 if (err < 0)
1250 goto out_release_both;
1251
1252 fd1 = sock_alloc_fd(&newfile1);
1253 if (unlikely(fd1 < 0)) {
1254 err = fd1;
1255 goto out_release_both;
1256 }
1257
1258 fd2 = sock_alloc_fd(&newfile2);
1259 if (unlikely(fd2 < 0)) {
1260 err = fd2;
1261 put_filp(newfile1);
1262 put_unused_fd(fd1);
1263 goto out_release_both;
1264 }
1265
1266 err = sock_attach_fd(sock1, newfile1);
1267 if (unlikely(err < 0)) {
1268 goto out_fd2;
1269 }
1270
1271 err = sock_attach_fd(sock2, newfile2);
1272 if (unlikely(err < 0)) {
1273 fput(newfile1);
1274 goto out_fd1;
1275 }
1276
1277 err = audit_fd_pair(fd1, fd2);
1278 if (err < 0) {
1279 fput(newfile1);
1280 fput(newfile2);
1281 goto out_fd;
1282 }
1283
1284 fd_install(fd1, newfile1);
1285 fd_install(fd2, newfile2);
1286
1287
1288
1289
1290 err = put_user(fd1, &usockvec[0]);
1291 if (!err)
1292 err = put_user(fd2, &usockvec[1]);
1293 if (!err)
1294 return 0;
1295
1296 sys_close(fd2);
1297 sys_close(fd1);
1298 return err;
1299
1300out_release_both:
1301 sock_release(sock2);
1302out_release_1:
1303 sock_release(sock1);
1304out:
1305 return err;
1306
1307out_fd2:
1308 put_filp(newfile1);
1309 sock_release(sock1);
1310out_fd1:
1311 put_filp(newfile2);
1312 sock_release(sock2);
1313out_fd:
1314 put_unused_fd(fd1);
1315 put_unused_fd(fd2);
1316 goto out;
1317}
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1328{
1329 struct socket *sock;
1330 char address[MAX_SOCK_ADDR];
1331 int err, fput_needed;
1332
1333 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1334 if (sock) {
1335 err = move_addr_to_kernel(umyaddr, addrlen, address);
1336 if (err >= 0) {
1337 err = security_socket_bind(sock,
1338 (struct sockaddr *)address,
1339 addrlen);
1340 if (!err)
1341 err = sock->ops->bind(sock,
1342 (struct sockaddr *)
1343 address, addrlen);
1344 }
1345 fput_light(sock->file, fput_needed);
1346 }
1347 return err;
1348}
1349
1350
1351
1352
1353
1354
1355
1356int sysctl_somaxconn __read_mostly = SOMAXCONN;
1357
1358asmlinkage long sys_listen(int fd, int backlog)
1359{
1360 struct socket *sock;
1361 int err, fput_needed;
1362
1363 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1364 if (sock) {
1365 if ((unsigned)backlog > sysctl_somaxconn)
1366 backlog = sysctl_somaxconn;
1367
1368 err = security_socket_listen(sock, backlog);
1369 if (!err)
1370 err = sock->ops->listen(sock, backlog);
1371
1372 fput_light(sock->file, fput_needed);
1373 }
1374 return err;
1375}
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
1390 int __user *upeer_addrlen)
1391{
1392 struct socket *sock, *newsock;
1393 struct file *newfile;
1394 int err, len, newfd, fput_needed;
1395 char address[MAX_SOCK_ADDR];
1396
1397 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1398 if (!sock)
1399 goto out;
1400
1401 err = -ENFILE;
1402 if (!(newsock = sock_alloc()))
1403 goto out_put;
1404
1405 newsock->type = sock->type;
1406 newsock->ops = sock->ops;
1407
1408
1409
1410
1411
1412 __module_get(newsock->ops->owner);
1413
1414 newfd = sock_alloc_fd(&newfile);
1415 if (unlikely(newfd < 0)) {
1416 err = newfd;
1417 sock_release(newsock);
1418 goto out_put;
1419 }
1420
1421 err = sock_attach_fd(newsock, newfile);
1422 if (err < 0)
1423 goto out_fd_simple;
1424
1425 err = security_socket_accept(sock, newsock);
1426 if (err)
1427 goto out_fd;
1428
1429 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1430 if (err < 0)
1431 goto out_fd;
1432
1433 if (upeer_sockaddr) {
1434 if (newsock->ops->getname(newsock, (struct sockaddr *)address,
1435 &len, 2) < 0) {
1436 err = -ECONNABORTED;
1437 goto out_fd;
1438 }
1439 err = move_addr_to_user(address, len, upeer_sockaddr,
1440 upeer_addrlen);
1441 if (err < 0)
1442 goto out_fd;
1443 }
1444
1445
1446
1447 fd_install(newfd, newfile);
1448 err = newfd;
1449
1450 security_socket_post_accept(sock, newsock);
1451
1452out_put:
1453 fput_light(sock->file, fput_needed);
1454out:
1455 return err;
1456out_fd_simple:
1457 sock_release(newsock);
1458 put_filp(newfile);
1459 put_unused_fd(newfd);
1460 goto out_put;
1461out_fd:
1462 fput(newfile);
1463 put_unused_fd(newfd);
1464 goto out_put;
1465}
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr,
1480 int addrlen)
1481{
1482 struct socket *sock;
1483 char address[MAX_SOCK_ADDR];
1484 int err, fput_needed;
1485
1486 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1487 if (!sock)
1488 goto out;
1489 err = move_addr_to_kernel(uservaddr, addrlen, address);
1490 if (err < 0)
1491 goto out_put;
1492
1493 err =
1494 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
1495 if (err)
1496 goto out_put;
1497
1498 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
1499 sock->file->f_flags);
1500out_put:
1501 fput_light(sock->file, fput_needed);
1502out:
1503 return err;
1504}
1505
1506
1507
1508
1509
1510
1511asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1512 int __user *usockaddr_len)
1513{
1514 struct socket *sock;
1515 char address[MAX_SOCK_ADDR];
1516 int len, err, fput_needed;
1517
1518 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1519 if (!sock)
1520 goto out;
1521
1522 err = security_socket_getsockname(sock);
1523 if (err)
1524 goto out_put;
1525
1526 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
1527 if (err)
1528 goto out_put;
1529 err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
1530
1531out_put:
1532 fput_light(sock->file, fput_needed);
1533out:
1534 return err;
1535}
1536
1537
1538
1539
1540
1541
1542asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1543 int __user *usockaddr_len)
1544{
1545 struct socket *sock;
1546 char address[MAX_SOCK_ADDR];
1547 int len, err, fput_needed;
1548
1549 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1550 if (sock != NULL) {
1551 err = security_socket_getpeername(sock);
1552 if (err) {
1553 fput_light(sock->file, fput_needed);
1554 return err;
1555 }
1556
1557 err =
1558 sock->ops->getname(sock, (struct sockaddr *)address, &len,
1559 1);
1560 if (!err)
1561 err = move_addr_to_user(address, len, usockaddr,
1562 usockaddr_len);
1563 fput_light(sock->file, fput_needed);
1564 }
1565 return err;
1566}
1567
1568
1569
1570
1571
1572
1573
1574asmlinkage long sys_sendto(int fd, void __user *buff, size_t len,
1575 unsigned flags, struct sockaddr __user *addr,
1576 int addr_len)
1577{
1578 struct socket *sock;
1579 char address[MAX_SOCK_ADDR];
1580 int err;
1581 struct msghdr msg;
1582 struct iovec iov;
1583 int fput_needed;
1584 struct file *sock_file;
1585
1586 sock_file = fget_light(fd, &fput_needed);
1587 err = -EBADF;
1588 if (!sock_file)
1589 goto out;
1590
1591 sock = sock_from_file(sock_file, &err);
1592 if (!sock)
1593 goto out_put;
1594 iov.iov_base = buff;
1595 iov.iov_len = len;
1596 msg.msg_name = NULL;
1597 msg.msg_iov = &iov;
1598 msg.msg_iovlen = 1;
1599 msg.msg_control = NULL;
1600 msg.msg_controllen = 0;
1601 msg.msg_namelen = 0;
1602 if (addr) {
1603 err = move_addr_to_kernel(addr, addr_len, address);
1604 if (err < 0)
1605 goto out_put;
1606 msg.msg_name = address;
1607 msg.msg_namelen = addr_len;
1608 }
1609 if (sock->file->f_flags & O_NONBLOCK)
1610 flags |= MSG_DONTWAIT;
1611 msg.msg_flags = flags;
1612 err = sock_sendmsg(sock, &msg, len);
1613
1614out_put:
1615 fput_light(sock_file, fput_needed);
1616out:
1617 return err;
1618}
1619
1620
1621
1622
1623
1624asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags)
1625{
1626 return sys_sendto(fd, buff, len, flags, NULL, 0);
1627}
1628
1629
1630
1631
1632
1633
1634
1635asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size,
1636 unsigned flags, struct sockaddr __user *addr,
1637 int __user *addr_len)
1638{
1639 struct socket *sock;
1640 struct iovec iov;
1641 struct msghdr msg;
1642 char address[MAX_SOCK_ADDR];
1643 int err, err2;
1644 struct file *sock_file;
1645 int fput_needed;
1646
1647 sock_file = fget_light(fd, &fput_needed);
1648 err = -EBADF;
1649 if (!sock_file)
1650 goto out;
1651
1652 sock = sock_from_file(sock_file, &err);
1653 if (!sock)
1654 goto out_put;
1655
1656 msg.msg_control = NULL;
1657 msg.msg_controllen = 0;
1658 msg.msg_iovlen = 1;
1659 msg.msg_iov = &iov;
1660 iov.iov_len = size;
1661 iov.iov_base = ubuf;
1662 msg.msg_name = address;
1663 msg.msg_namelen = MAX_SOCK_ADDR;
1664 if (sock->file->f_flags & O_NONBLOCK)
1665 flags |= MSG_DONTWAIT;
1666 err = sock_recvmsg(sock, &msg, size, flags);
1667
1668 if (err >= 0 && addr != NULL) {
1669 err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
1670 if (err2 < 0)
1671 err = err2;
1672 }
1673out_put:
1674 fput_light(sock_file, fput_needed);
1675out:
1676 return err;
1677}
1678
1679
1680
1681
1682
1683asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1684 unsigned flags)
1685{
1686 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1687}
1688
1689
1690
1691
1692
1693
1694asmlinkage long sys_setsockopt(int fd, int level, int optname,
1695 char __user *optval, int optlen)
1696{
1697 int err, fput_needed;
1698 struct socket *sock;
1699
1700 if (optlen < 0)
1701 return -EINVAL;
1702
1703 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1704 if (sock != NULL) {
1705 err = security_socket_setsockopt(sock, level, optname);
1706 if (err)
1707 goto out_put;
1708
1709 if (level == SOL_SOCKET)
1710 err =
1711 sock_setsockopt(sock, level, optname, optval,
1712 optlen);
1713 else
1714 err =
1715 sock->ops->setsockopt(sock, level, optname, optval,
1716 optlen);
1717out_put:
1718 fput_light(sock->file, fput_needed);
1719 }
1720 return err;
1721}
1722
1723
1724
1725
1726
1727
1728asmlinkage long sys_getsockopt(int fd, int level, int optname,
1729 char __user *optval, int __user *optlen)
1730{
1731 int err, fput_needed;
1732 struct socket *sock;
1733
1734 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1735 if (sock != NULL) {
1736 err = security_socket_getsockopt(sock, level, optname);
1737 if (err)
1738 goto out_put;
1739
1740 if (level == SOL_SOCKET)
1741 err =
1742 sock_getsockopt(sock, level, optname, optval,
1743 optlen);
1744 else
1745 err =
1746 sock->ops->getsockopt(sock, level, optname, optval,
1747 optlen);
1748out_put:
1749 fput_light(sock->file, fput_needed);
1750 }
1751 return err;
1752}
1753
1754
1755
1756
1757
1758asmlinkage long sys_shutdown(int fd, int how)
1759{
1760 int err, fput_needed;
1761 struct socket *sock;
1762
1763 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1764 if (sock != NULL) {
1765 err = security_socket_shutdown(sock, how);
1766 if (!err)
1767 err = sock->ops->shutdown(sock, how);
1768 fput_light(sock->file, fput_needed);
1769 }
1770 return err;
1771}
1772
1773
1774
1775
1776#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1777#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1778#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1779
1780
1781
1782
1783
1784asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
1785{
1786 struct compat_msghdr __user *msg_compat =
1787 (struct compat_msghdr __user *)msg;
1788 struct socket *sock;
1789 char address[MAX_SOCK_ADDR];
1790 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1791 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1792 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1793
1794 unsigned char *ctl_buf = ctl;
1795 struct msghdr msg_sys;
1796 int err, ctl_len, iov_size, total_len;
1797 int fput_needed;
1798
1799 err = -EFAULT;
1800 if (MSG_CMSG_COMPAT & flags) {
1801 if (get_compat_msghdr(&msg_sys, msg_compat))
1802 return -EFAULT;
1803 }
1804 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1805 return -EFAULT;
1806
1807 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1808 if (!sock)
1809 goto out;
1810
1811
1812 err = -EMSGSIZE;
1813 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1814 goto out_put;
1815
1816
1817 err = -ENOMEM;
1818 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1819 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1820 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1821 if (!iov)
1822 goto out_put;
1823 }
1824
1825
1826 if (MSG_CMSG_COMPAT & flags) {
1827 err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
1828 } else
1829 err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
1830 if (err < 0)
1831 goto out_freeiov;
1832 total_len = err;
1833
1834 err = -ENOBUFS;
1835
1836 if (msg_sys.msg_controllen > INT_MAX)
1837 goto out_freeiov;
1838 ctl_len = msg_sys.msg_controllen;
1839 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1840 err =
1841 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
1842 sizeof(ctl));
1843 if (err)
1844 goto out_freeiov;
1845 ctl_buf = msg_sys.msg_control;
1846 ctl_len = msg_sys.msg_controllen;
1847 } else if (ctl_len) {
1848 if (ctl_len > sizeof(ctl)) {
1849 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1850 if (ctl_buf == NULL)
1851 goto out_freeiov;
1852 }
1853 err = -EFAULT;
1854
1855
1856
1857
1858
1859 if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
1860 ctl_len))
1861 goto out_freectl;
1862 msg_sys.msg_control = ctl_buf;
1863 }
1864 msg_sys.msg_flags = flags;
1865
1866 if (sock->file->f_flags & O_NONBLOCK)
1867 msg_sys.msg_flags |= MSG_DONTWAIT;
1868 err = sock_sendmsg(sock, &msg_sys, total_len);
1869
1870out_freectl:
1871 if (ctl_buf != ctl)
1872 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1873out_freeiov:
1874 if (iov != iovstack)
1875 sock_kfree_s(sock->sk, iov, iov_size);
1876out_put:
1877 fput_light(sock->file, fput_needed);
1878out:
1879 return err;
1880}
1881
1882
1883
1884
1885
1886asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
1887 unsigned int flags)
1888{
1889 struct compat_msghdr __user *msg_compat =
1890 (struct compat_msghdr __user *)msg;
1891 struct socket *sock;
1892 struct iovec iovstack[UIO_FASTIOV];
1893 struct iovec *iov = iovstack;
1894 struct msghdr msg_sys;
1895 unsigned long cmsg_ptr;
1896 int err, iov_size, total_len, len;
1897 int fput_needed;
1898
1899
1900 char addr[MAX_SOCK_ADDR];
1901
1902
1903 struct sockaddr __user *uaddr;
1904 int __user *uaddr_len;
1905
1906 if (MSG_CMSG_COMPAT & flags) {
1907 if (get_compat_msghdr(&msg_sys, msg_compat))
1908 return -EFAULT;
1909 }
1910 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1911 return -EFAULT;
1912
1913 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1914 if (!sock)
1915 goto out;
1916
1917 err = -EMSGSIZE;
1918 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1919 goto out_put;
1920
1921
1922 err = -ENOMEM;
1923 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1924 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1925 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1926 if (!iov)
1927 goto out_put;
1928 }
1929
1930
1931
1932
1933
1934
1935 uaddr = (__force void __user *)msg_sys.msg_name;
1936 uaddr_len = COMPAT_NAMELEN(msg);
1937 if (MSG_CMSG_COMPAT & flags) {
1938 err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1939 } else
1940 err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1941 if (err < 0)
1942 goto out_freeiov;
1943 total_len = err;
1944
1945 cmsg_ptr = (unsigned long)msg_sys.msg_control;
1946 msg_sys.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
1947
1948 if (sock->file->f_flags & O_NONBLOCK)
1949 flags |= MSG_DONTWAIT;
1950 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
1951 if (err < 0)
1952 goto out_freeiov;
1953 len = err;
1954
1955 if (uaddr != NULL) {
1956 err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr,
1957 uaddr_len);
1958 if (err < 0)
1959 goto out_freeiov;
1960 }
1961 err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT),
1962 COMPAT_FLAGS(msg));
1963 if (err)
1964 goto out_freeiov;
1965 if (MSG_CMSG_COMPAT & flags)
1966 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
1967 &msg_compat->msg_controllen);
1968 else
1969 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
1970 &msg->msg_controllen);
1971 if (err)
1972 goto out_freeiov;
1973 err = len;
1974
1975out_freeiov:
1976 if (iov != iovstack)
1977 sock_kfree_s(sock->sk, iov, iov_size);
1978out_put:
1979 fput_light(sock->file, fput_needed);
1980out:
1981 return err;
1982}
1983
1984#ifdef __ARCH_WANT_SYS_SOCKETCALL
1985
1986
1987#define AL(x) ((x) * sizeof(unsigned long))
1988static const unsigned char nargs[18]={
1989 AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1990 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
1991 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)
1992};
1993
1994#undef AL
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004asmlinkage long sys_socketcall(int call, unsigned long __user *args)
2005{
2006 unsigned long a[6];
2007 unsigned long a0, a1;
2008 int err;
2009
2010 if (call < 1 || call > SYS_RECVMSG)
2011 return -EINVAL;
2012
2013
2014 if (copy_from_user(a, args, nargs[call]))
2015 return -EFAULT;
2016
2017 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2018 if (err)
2019 return err;
2020
2021 a0 = a[0];
2022 a1 = a[1];
2023
2024 switch (call) {
2025 case SYS_SOCKET:
2026 err = sys_socket(a0, a1, a[2]);
2027 break;
2028 case SYS_BIND:
2029 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2030 break;
2031 case SYS_CONNECT:
2032 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2033 break;
2034 case SYS_LISTEN:
2035 err = sys_listen(a0, a1);
2036 break;
2037 case SYS_ACCEPT:
2038 err =
2039 sys_accept(a0, (struct sockaddr __user *)a1,
2040 (int __user *)a[2]);
2041 break;
2042 case SYS_GETSOCKNAME:
2043 err =
2044 sys_getsockname(a0, (struct sockaddr __user *)a1,
2045 (int __user *)a[2]);
2046 break;
2047 case SYS_GETPEERNAME:
2048 err =
2049 sys_getpeername(a0, (struct sockaddr __user *)a1,
2050 (int __user *)a[2]);
2051 break;
2052 case SYS_SOCKETPAIR:
2053 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2054 break;
2055 case SYS_SEND:
2056 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2057 break;
2058 case SYS_SENDTO:
2059 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2060 (struct sockaddr __user *)a[4], a[5]);
2061 break;
2062 case SYS_RECV:
2063 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2064 break;
2065 case SYS_RECVFROM:
2066 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2067 (struct sockaddr __user *)a[4],
2068 (int __user *)a[5]);
2069 break;
2070 case SYS_SHUTDOWN:
2071 err = sys_shutdown(a0, a1);
2072 break;
2073 case SYS_SETSOCKOPT:
2074 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2075 break;
2076 case SYS_GETSOCKOPT:
2077 err =
2078 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2079 (int __user *)a[4]);
2080 break;
2081 case SYS_SENDMSG:
2082 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2083 break;
2084 case SYS_RECVMSG:
2085 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2086 break;
2087 default:
2088 err = -EINVAL;
2089 break;
2090 }
2091 return err;
2092}
2093
2094#endif
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105int sock_register(const struct net_proto_family *ops)
2106{
2107 int err;
2108
2109 if (ops->family >= NPROTO) {
2110 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2111 NPROTO);
2112 return -ENOBUFS;
2113 }
2114
2115 spin_lock(&net_family_lock);
2116 if (net_families[ops->family])
2117 err = -EEXIST;
2118 else {
2119 net_families[ops->family] = ops;
2120 err = 0;
2121 }
2122 spin_unlock(&net_family_lock);
2123
2124 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
2125 return err;
2126}
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141void sock_unregister(int family)
2142{
2143 BUG_ON(family < 0 || family >= NPROTO);
2144
2145 spin_lock(&net_family_lock);
2146 net_families[family] = NULL;
2147 spin_unlock(&net_family_lock);
2148
2149 synchronize_rcu();
2150
2151 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
2152}
2153
2154static int __init sock_init(void)
2155{
2156
2157
2158
2159
2160 sk_init();
2161
2162
2163
2164
2165 skb_init();
2166
2167
2168
2169
2170
2171 init_inodecache();
2172 register_filesystem(&sock_fs_type);
2173 sock_mnt = kern_mount(&sock_fs_type);
2174
2175
2176
2177
2178#ifdef CONFIG_NETFILTER
2179 netfilter_init();
2180#endif
2181
2182 return 0;
2183}
2184
2185core_initcall(sock_init);
2186
2187#ifdef CONFIG_PROC_FS
2188void socket_seq_show(struct seq_file *seq)
2189{
2190 int cpu;
2191 int counter = 0;
2192
2193 for_each_possible_cpu(cpu)
2194 counter += per_cpu(sockets_in_use, cpu);
2195
2196
2197 if (counter < 0)
2198 counter = 0;
2199
2200 seq_printf(seq, "sockets: used %d\n", counter);
2201}
2202#endif
2203
2204#ifdef CONFIG_COMPAT
2205static long compat_sock_ioctl(struct file *file, unsigned cmd,
2206 unsigned long arg)
2207{
2208 struct socket *sock = file->private_data;
2209 int ret = -ENOIOCTLCMD;
2210
2211 if (sock->ops->compat_ioctl)
2212 ret = sock->ops->compat_ioctl(sock, cmd, arg);
2213
2214 return ret;
2215}
2216#endif
2217
2218int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
2219{
2220 return sock->ops->bind(sock, addr, addrlen);
2221}
2222
2223int kernel_listen(struct socket *sock, int backlog)
2224{
2225 return sock->ops->listen(sock, backlog);
2226}
2227
2228int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
2229{
2230 struct sock *sk = sock->sk;
2231 int err;
2232
2233 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
2234 newsock);
2235 if (err < 0)
2236 goto done;
2237
2238 err = sock->ops->accept(sock, *newsock, flags);
2239 if (err < 0) {
2240 sock_release(*newsock);
2241 *newsock = NULL;
2242 goto done;
2243 }
2244
2245 (*newsock)->ops = sock->ops;
2246
2247done:
2248 return err;
2249}
2250
2251int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
2252 int flags)
2253{
2254 return sock->ops->connect(sock, addr, addrlen, flags);
2255}
2256
2257int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
2258 int *addrlen)
2259{
2260 return sock->ops->getname(sock, addr, addrlen, 0);
2261}
2262
2263int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
2264 int *addrlen)
2265{
2266 return sock->ops->getname(sock, addr, addrlen, 1);
2267}
2268
2269int kernel_getsockopt(struct socket *sock, int level, int optname,
2270 char *optval, int *optlen)
2271{
2272 mm_segment_t oldfs = get_fs();
2273 int err;
2274
2275 set_fs(KERNEL_DS);
2276 if (level == SOL_SOCKET)
2277 err = sock_getsockopt(sock, level, optname, optval, optlen);
2278 else
2279 err = sock->ops->getsockopt(sock, level, optname, optval,
2280 optlen);
2281 set_fs(oldfs);
2282 return err;
2283}
2284
2285int kernel_setsockopt(struct socket *sock, int level, int optname,
2286 char *optval, int optlen)
2287{
2288 mm_segment_t oldfs = get_fs();
2289 int err;
2290
2291 set_fs(KERNEL_DS);
2292 if (level == SOL_SOCKET)
2293 err = sock_setsockopt(sock, level, optname, optval, optlen);
2294 else
2295 err = sock->ops->setsockopt(sock, level, optname, optval,
2296 optlen);
2297 set_fs(oldfs);
2298 return err;
2299}
2300
2301int kernel_sendpage(struct socket *sock, struct page *page, int offset,
2302 size_t size, int flags)
2303{
2304 if (sock->ops->sendpage)
2305 return sock->ops->sendpage(sock, page, offset, size, flags);
2306
2307 return sock_no_sendpage(sock, page, offset, size, flags);
2308}
2309
2310int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
2311{
2312 mm_segment_t oldfs = get_fs();
2313 int err;
2314
2315 set_fs(KERNEL_DS);
2316 err = sock->ops->ioctl(sock, cmd, arg);
2317 set_fs(oldfs);
2318
2319 return err;
2320}
2321
2322int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
2323{
2324 return sock->ops->shutdown(sock, how);
2325}
2326
2327
2328EXPORT_SYMBOL(move_addr_to_kernel);
2329EXPORT_SYMBOL(move_addr_to_user);
2330EXPORT_SYMBOL(sock_create);
2331EXPORT_SYMBOL(sock_create_kern);
2332EXPORT_SYMBOL(sock_create_lite);
2333EXPORT_SYMBOL(sock_map_fd);
2334EXPORT_SYMBOL(sock_recvmsg);
2335EXPORT_SYMBOL(sock_register);
2336EXPORT_SYMBOL(sock_release);
2337EXPORT_SYMBOL(sock_sendmsg);
2338EXPORT_SYMBOL(sock_unregister);
2339EXPORT_SYMBOL(sock_wake_async);
2340EXPORT_SYMBOL(sockfd_lookup);
2341EXPORT_SYMBOL(kernel_sendmsg);
2342EXPORT_SYMBOL(kernel_recvmsg);
2343EXPORT_SYMBOL(kernel_bind);
2344EXPORT_SYMBOL(kernel_listen);
2345EXPORT_SYMBOL(kernel_accept);
2346EXPORT_SYMBOL(kernel_connect);
2347EXPORT_SYMBOL(kernel_getsockname);
2348EXPORT_SYMBOL(kernel_getpeername);
2349EXPORT_SYMBOL(kernel_getsockopt);
2350EXPORT_SYMBOL(kernel_setsockopt);
2351EXPORT_SYMBOL(kernel_sendpage);
2352EXPORT_SYMBOL(kernel_sock_ioctl);
2353EXPORT_SYMBOL(kernel_sock_shutdown);
2354