1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88#include <linux/types.h>
89#include <linux/bitops.h>
90#include <linux/cred.h>
91#include <linux/init.h>
92#include <linux/io.h>
93#include <linux/kernel.h>
94#include <linux/sched/signal.h>
95#include <linux/kmod.h>
96#include <linux/list.h>
97#include <linux/miscdevice.h>
98#include <linux/module.h>
99#include <linux/mutex.h>
100#include <linux/net.h>
101#include <linux/poll.h>
102#include <linux/random.h>
103#include <linux/skbuff.h>
104#include <linux/smp.h>
105#include <linux/socket.h>
106#include <linux/stddef.h>
107#include <linux/unistd.h>
108#include <linux/wait.h>
109#include <linux/workqueue.h>
110#include <net/sock.h>
111#include <net/af_vsock.h>
112
113static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
114static void vsock_sk_destruct(struct sock *sk);
115static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
116
117
118static struct proto vsock_proto = {
119 .name = "AF_VSOCK",
120 .owner = THIS_MODULE,
121 .obj_size = sizeof(struct vsock_sock),
122};
123
124
125
126
127#define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
128
129static const struct vsock_transport *transport;
130static DEFINE_MUTEX(vsock_register_mutex);
131
132
133
134
135
136int vm_sockets_get_local_cid(void)
137{
138 return transport->get_local_cid();
139}
140EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid);
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158#define MAX_PORT_RETRIES 24
159
160#define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE)
161#define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)])
162#define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE])
163
164
165#define VSOCK_CONN_HASH(src, dst) \
166 (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE)
167#define vsock_connected_sockets(src, dst) \
168 (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)])
169#define vsock_connected_sockets_vsk(vsk) \
170 vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr)
171
172struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
173EXPORT_SYMBOL_GPL(vsock_bind_table);
174struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
175EXPORT_SYMBOL_GPL(vsock_connected_table);
176DEFINE_SPINLOCK(vsock_table_lock);
177EXPORT_SYMBOL_GPL(vsock_table_lock);
178
179
180static int vsock_auto_bind(struct vsock_sock *vsk)
181{
182 struct sock *sk = sk_vsock(vsk);
183 struct sockaddr_vm local_addr;
184
185 if (vsock_addr_bound(&vsk->local_addr))
186 return 0;
187 vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
188 return __vsock_bind(sk, &local_addr);
189}
190
191static int __init vsock_init_tables(void)
192{
193 int i;
194
195 for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++)
196 INIT_LIST_HEAD(&vsock_bind_table[i]);
197
198 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++)
199 INIT_LIST_HEAD(&vsock_connected_table[i]);
200 return 0;
201}
202
203static void __vsock_insert_bound(struct list_head *list,
204 struct vsock_sock *vsk)
205{
206 sock_hold(&vsk->sk);
207 list_add(&vsk->bound_table, list);
208}
209
210static void __vsock_insert_connected(struct list_head *list,
211 struct vsock_sock *vsk)
212{
213 sock_hold(&vsk->sk);
214 list_add(&vsk->connected_table, list);
215}
216
217static void __vsock_remove_bound(struct vsock_sock *vsk)
218{
219 list_del_init(&vsk->bound_table);
220 sock_put(&vsk->sk);
221}
222
223static void __vsock_remove_connected(struct vsock_sock *vsk)
224{
225 list_del_init(&vsk->connected_table);
226 sock_put(&vsk->sk);
227}
228
229static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
230{
231 struct vsock_sock *vsk;
232
233 list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table)
234 if (addr->svm_port == vsk->local_addr.svm_port)
235 return sk_vsock(vsk);
236
237 return NULL;
238}
239
240static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
241 struct sockaddr_vm *dst)
242{
243 struct vsock_sock *vsk;
244
245 list_for_each_entry(vsk, vsock_connected_sockets(src, dst),
246 connected_table) {
247 if (vsock_addr_equals_addr(src, &vsk->remote_addr) &&
248 dst->svm_port == vsk->local_addr.svm_port) {
249 return sk_vsock(vsk);
250 }
251 }
252
253 return NULL;
254}
255
256static void vsock_insert_unbound(struct vsock_sock *vsk)
257{
258 spin_lock_bh(&vsock_table_lock);
259 __vsock_insert_bound(vsock_unbound_sockets, vsk);
260 spin_unlock_bh(&vsock_table_lock);
261}
262
263void vsock_insert_connected(struct vsock_sock *vsk)
264{
265 struct list_head *list = vsock_connected_sockets(
266 &vsk->remote_addr, &vsk->local_addr);
267
268 spin_lock_bh(&vsock_table_lock);
269 __vsock_insert_connected(list, vsk);
270 spin_unlock_bh(&vsock_table_lock);
271}
272EXPORT_SYMBOL_GPL(vsock_insert_connected);
273
274void vsock_remove_bound(struct vsock_sock *vsk)
275{
276 spin_lock_bh(&vsock_table_lock);
277 if (__vsock_in_bound_table(vsk))
278 __vsock_remove_bound(vsk);
279 spin_unlock_bh(&vsock_table_lock);
280}
281EXPORT_SYMBOL_GPL(vsock_remove_bound);
282
283void vsock_remove_connected(struct vsock_sock *vsk)
284{
285 spin_lock_bh(&vsock_table_lock);
286 if (__vsock_in_connected_table(vsk))
287 __vsock_remove_connected(vsk);
288 spin_unlock_bh(&vsock_table_lock);
289}
290EXPORT_SYMBOL_GPL(vsock_remove_connected);
291
292struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
293{
294 struct sock *sk;
295
296 spin_lock_bh(&vsock_table_lock);
297 sk = __vsock_find_bound_socket(addr);
298 if (sk)
299 sock_hold(sk);
300
301 spin_unlock_bh(&vsock_table_lock);
302
303 return sk;
304}
305EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
306
307struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
308 struct sockaddr_vm *dst)
309{
310 struct sock *sk;
311
312 spin_lock_bh(&vsock_table_lock);
313 sk = __vsock_find_connected_socket(src, dst);
314 if (sk)
315 sock_hold(sk);
316
317 spin_unlock_bh(&vsock_table_lock);
318
319 return sk;
320}
321EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
322
323void vsock_remove_sock(struct vsock_sock *vsk)
324{
325 vsock_remove_bound(vsk);
326 vsock_remove_connected(vsk);
327}
328EXPORT_SYMBOL_GPL(vsock_remove_sock);
329
330void vsock_for_each_connected_socket(void (*fn)(struct sock *sk))
331{
332 int i;
333
334 spin_lock_bh(&vsock_table_lock);
335
336 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) {
337 struct vsock_sock *vsk;
338 list_for_each_entry(vsk, &vsock_connected_table[i],
339 connected_table)
340 fn(sk_vsock(vsk));
341 }
342
343 spin_unlock_bh(&vsock_table_lock);
344}
345EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket);
346
347void vsock_add_pending(struct sock *listener, struct sock *pending)
348{
349 struct vsock_sock *vlistener;
350 struct vsock_sock *vpending;
351
352 vlistener = vsock_sk(listener);
353 vpending = vsock_sk(pending);
354
355 sock_hold(pending);
356 sock_hold(listener);
357 list_add_tail(&vpending->pending_links, &vlistener->pending_links);
358}
359EXPORT_SYMBOL_GPL(vsock_add_pending);
360
361void vsock_remove_pending(struct sock *listener, struct sock *pending)
362{
363 struct vsock_sock *vpending = vsock_sk(pending);
364
365 list_del_init(&vpending->pending_links);
366 sock_put(listener);
367 sock_put(pending);
368}
369EXPORT_SYMBOL_GPL(vsock_remove_pending);
370
371void vsock_enqueue_accept(struct sock *listener, struct sock *connected)
372{
373 struct vsock_sock *vlistener;
374 struct vsock_sock *vconnected;
375
376 vlistener = vsock_sk(listener);
377 vconnected = vsock_sk(connected);
378
379 sock_hold(connected);
380 sock_hold(listener);
381 list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue);
382}
383EXPORT_SYMBOL_GPL(vsock_enqueue_accept);
384
385static struct sock *vsock_dequeue_accept(struct sock *listener)
386{
387 struct vsock_sock *vlistener;
388 struct vsock_sock *vconnected;
389
390 vlistener = vsock_sk(listener);
391
392 if (list_empty(&vlistener->accept_queue))
393 return NULL;
394
395 vconnected = list_entry(vlistener->accept_queue.next,
396 struct vsock_sock, accept_queue);
397
398 list_del_init(&vconnected->accept_queue);
399 sock_put(listener);
400
401
402
403
404 return sk_vsock(vconnected);
405}
406
407static bool vsock_is_accept_queue_empty(struct sock *sk)
408{
409 struct vsock_sock *vsk = vsock_sk(sk);
410 return list_empty(&vsk->accept_queue);
411}
412
413static bool vsock_is_pending(struct sock *sk)
414{
415 struct vsock_sock *vsk = vsock_sk(sk);
416 return !list_empty(&vsk->pending_links);
417}
418
419static int vsock_send_shutdown(struct sock *sk, int mode)
420{
421 return transport->shutdown(vsock_sk(sk), mode);
422}
423
424static void vsock_pending_work(struct work_struct *work)
425{
426 struct sock *sk;
427 struct sock *listener;
428 struct vsock_sock *vsk;
429 bool cleanup;
430
431 vsk = container_of(work, struct vsock_sock, pending_work.work);
432 sk = sk_vsock(vsk);
433 listener = vsk->listener;
434 cleanup = true;
435
436 lock_sock(listener);
437 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
438
439 if (vsock_is_pending(sk)) {
440 vsock_remove_pending(listener, sk);
441
442 listener->sk_ack_backlog--;
443 } else if (!vsk->rejected) {
444
445
446
447
448
449 cleanup = false;
450 goto out;
451 }
452
453
454
455
456
457 vsock_remove_connected(vsk);
458
459 sk->sk_state = TCP_CLOSE;
460
461out:
462 release_sock(sk);
463 release_sock(listener);
464 if (cleanup)
465 sock_put(sk);
466
467 sock_put(sk);
468 sock_put(listener);
469}
470
471
472
473static int __vsock_bind_stream(struct vsock_sock *vsk,
474 struct sockaddr_vm *addr)
475{
476 static u32 port;
477 struct sockaddr_vm new_addr;
478
479 if (!port)
480 port = LAST_RESERVED_PORT + 1 +
481 prandom_u32_max(U32_MAX - LAST_RESERVED_PORT);
482
483 vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
484
485 if (addr->svm_port == VMADDR_PORT_ANY) {
486 bool found = false;
487 unsigned int i;
488
489 for (i = 0; i < MAX_PORT_RETRIES; i++) {
490 if (port <= LAST_RESERVED_PORT)
491 port = LAST_RESERVED_PORT + 1;
492
493 new_addr.svm_port = port++;
494
495 if (!__vsock_find_bound_socket(&new_addr)) {
496 found = true;
497 break;
498 }
499 }
500
501 if (!found)
502 return -EADDRNOTAVAIL;
503 } else {
504
505
506
507 if (addr->svm_port <= LAST_RESERVED_PORT &&
508 !capable(CAP_NET_BIND_SERVICE)) {
509 return -EACCES;
510 }
511
512 if (__vsock_find_bound_socket(&new_addr))
513 return -EADDRINUSE;
514 }
515
516 vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
517
518
519
520
521
522 __vsock_remove_bound(vsk);
523 __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk);
524
525 return 0;
526}
527
528static int __vsock_bind_dgram(struct vsock_sock *vsk,
529 struct sockaddr_vm *addr)
530{
531 return transport->dgram_bind(vsk, addr);
532}
533
534static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
535{
536 struct vsock_sock *vsk = vsock_sk(sk);
537 u32 cid;
538 int retval;
539
540
541 if (vsock_addr_bound(&vsk->local_addr))
542 return -EINVAL;
543
544
545
546
547
548
549 cid = transport->get_local_cid();
550 if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY)
551 return -EADDRNOTAVAIL;
552
553 switch (sk->sk_socket->type) {
554 case SOCK_STREAM:
555 spin_lock_bh(&vsock_table_lock);
556 retval = __vsock_bind_stream(vsk, addr);
557 spin_unlock_bh(&vsock_table_lock);
558 break;
559
560 case SOCK_DGRAM:
561 retval = __vsock_bind_dgram(vsk, addr);
562 break;
563
564 default:
565 retval = -EINVAL;
566 break;
567 }
568
569 return retval;
570}
571
572static void vsock_connect_timeout(struct work_struct *work);
573
574struct sock *__vsock_create(struct net *net,
575 struct socket *sock,
576 struct sock *parent,
577 gfp_t priority,
578 unsigned short type,
579 int kern)
580{
581 struct sock *sk;
582 struct vsock_sock *psk;
583 struct vsock_sock *vsk;
584
585 sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern);
586 if (!sk)
587 return NULL;
588
589 sock_init_data(sock, sk);
590
591
592
593
594
595 if (!sock)
596 sk->sk_type = type;
597
598 vsk = vsock_sk(sk);
599 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
600 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
601
602 sk->sk_destruct = vsock_sk_destruct;
603 sk->sk_backlog_rcv = vsock_queue_rcv_skb;
604 sock_reset_flag(sk, SOCK_DONE);
605
606 INIT_LIST_HEAD(&vsk->bound_table);
607 INIT_LIST_HEAD(&vsk->connected_table);
608 vsk->listener = NULL;
609 INIT_LIST_HEAD(&vsk->pending_links);
610 INIT_LIST_HEAD(&vsk->accept_queue);
611 vsk->rejected = false;
612 vsk->sent_request = false;
613 vsk->ignore_connecting_rst = false;
614 vsk->peer_shutdown = 0;
615 INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout);
616 INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work);
617
618 psk = parent ? vsock_sk(parent) : NULL;
619 if (parent) {
620 vsk->trusted = psk->trusted;
621 vsk->owner = get_cred(psk->owner);
622 vsk->connect_timeout = psk->connect_timeout;
623 } else {
624 vsk->trusted = capable(CAP_NET_ADMIN);
625 vsk->owner = get_current_cred();
626 vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT;
627 }
628
629 if (transport->init(vsk, psk) < 0) {
630 sk_free(sk);
631 return NULL;
632 }
633
634 if (sock)
635 vsock_insert_unbound(vsk);
636
637 return sk;
638}
639EXPORT_SYMBOL_GPL(__vsock_create);
640
641static void __vsock_release(struct sock *sk)
642{
643 if (sk) {
644 struct sk_buff *skb;
645 struct sock *pending;
646 struct vsock_sock *vsk;
647
648 vsk = vsock_sk(sk);
649 pending = NULL;
650
651 transport->release(vsk);
652
653 lock_sock(sk);
654 sock_orphan(sk);
655 sk->sk_shutdown = SHUTDOWN_MASK;
656
657 while ((skb = skb_dequeue(&sk->sk_receive_queue)))
658 kfree_skb(skb);
659
660
661 while ((pending = vsock_dequeue_accept(sk)) != NULL) {
662 __vsock_release(pending);
663 sock_put(pending);
664 }
665
666 release_sock(sk);
667 sock_put(sk);
668 }
669}
670
671static void vsock_sk_destruct(struct sock *sk)
672{
673 struct vsock_sock *vsk = vsock_sk(sk);
674
675 transport->destruct(vsk);
676
677
678
679
680 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
681 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
682
683 put_cred(vsk->owner);
684}
685
686static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
687{
688 int err;
689
690 err = sock_queue_rcv_skb(sk, skb);
691 if (err)
692 kfree_skb(skb);
693
694 return err;
695}
696
697s64 vsock_stream_has_data(struct vsock_sock *vsk)
698{
699 return transport->stream_has_data(vsk);
700}
701EXPORT_SYMBOL_GPL(vsock_stream_has_data);
702
703s64 vsock_stream_has_space(struct vsock_sock *vsk)
704{
705 return transport->stream_has_space(vsk);
706}
707EXPORT_SYMBOL_GPL(vsock_stream_has_space);
708
709static int vsock_release(struct socket *sock)
710{
711 __vsock_release(sock->sk);
712 sock->sk = NULL;
713 sock->state = SS_FREE;
714
715 return 0;
716}
717
718static int
719vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
720{
721 int err;
722 struct sock *sk;
723 struct sockaddr_vm *vm_addr;
724
725 sk = sock->sk;
726
727 if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0)
728 return -EINVAL;
729
730 lock_sock(sk);
731 err = __vsock_bind(sk, vm_addr);
732 release_sock(sk);
733
734 return err;
735}
736
737static int vsock_getname(struct socket *sock,
738 struct sockaddr *addr, int peer)
739{
740 int err;
741 struct sock *sk;
742 struct vsock_sock *vsk;
743 struct sockaddr_vm *vm_addr;
744
745 sk = sock->sk;
746 vsk = vsock_sk(sk);
747 err = 0;
748
749 lock_sock(sk);
750
751 if (peer) {
752 if (sock->state != SS_CONNECTED) {
753 err = -ENOTCONN;
754 goto out;
755 }
756 vm_addr = &vsk->remote_addr;
757 } else {
758 vm_addr = &vsk->local_addr;
759 }
760
761 if (!vm_addr) {
762 err = -EINVAL;
763 goto out;
764 }
765
766
767
768
769
770
771 BUILD_BUG_ON(sizeof(*vm_addr) > 128);
772 memcpy(addr, vm_addr, sizeof(*vm_addr));
773 err = sizeof(*vm_addr);
774
775out:
776 release_sock(sk);
777 return err;
778}
779
780static int vsock_shutdown(struct socket *sock, int mode)
781{
782 int err;
783 struct sock *sk;
784
785
786
787
788
789
790
791 mode++;
792
793 if ((mode & ~SHUTDOWN_MASK) || !mode)
794 return -EINVAL;
795
796
797
798
799
800
801
802 sk = sock->sk;
803 if (sock->state == SS_UNCONNECTED) {
804 err = -ENOTCONN;
805 if (sk->sk_type == SOCK_STREAM)
806 return err;
807 } else {
808 sock->state = SS_DISCONNECTING;
809 err = 0;
810 }
811
812
813 mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN);
814 if (mode) {
815 lock_sock(sk);
816 sk->sk_shutdown |= mode;
817 sk->sk_state_change(sk);
818 release_sock(sk);
819
820 if (sk->sk_type == SOCK_STREAM) {
821 sock_reset_flag(sk, SOCK_DONE);
822 vsock_send_shutdown(sk, mode);
823 }
824 }
825
826 return err;
827}
828
829static __poll_t vsock_poll(struct file *file, struct socket *sock,
830 poll_table *wait)
831{
832 struct sock *sk;
833 __poll_t mask;
834 struct vsock_sock *vsk;
835
836 sk = sock->sk;
837 vsk = vsock_sk(sk);
838
839 poll_wait(file, sk_sleep(sk), wait);
840 mask = 0;
841
842 if (sk->sk_err)
843
844 mask |= EPOLLERR;
845
846
847
848
849 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
850 ((sk->sk_shutdown & SEND_SHUTDOWN) &&
851 (vsk->peer_shutdown & SEND_SHUTDOWN))) {
852 mask |= EPOLLHUP;
853 }
854
855 if (sk->sk_shutdown & RCV_SHUTDOWN ||
856 vsk->peer_shutdown & SEND_SHUTDOWN) {
857 mask |= EPOLLRDHUP;
858 }
859
860 if (sock->type == SOCK_DGRAM) {
861
862
863
864
865 if (!skb_queue_empty(&sk->sk_receive_queue) ||
866 (sk->sk_shutdown & RCV_SHUTDOWN)) {
867 mask |= EPOLLIN | EPOLLRDNORM;
868 }
869
870 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
871 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
872
873 } else if (sock->type == SOCK_STREAM) {
874 lock_sock(sk);
875
876
877
878
879 if (sk->sk_state == TCP_LISTEN
880 && !vsock_is_accept_queue_empty(sk))
881 mask |= EPOLLIN | EPOLLRDNORM;
882
883
884 if (transport->stream_is_active(vsk) &&
885 !(sk->sk_shutdown & RCV_SHUTDOWN)) {
886 bool data_ready_now = false;
887 int ret = transport->notify_poll_in(
888 vsk, 1, &data_ready_now);
889 if (ret < 0) {
890 mask |= EPOLLERR;
891 } else {
892 if (data_ready_now)
893 mask |= EPOLLIN | EPOLLRDNORM;
894
895 }
896 }
897
898
899
900
901
902 if (sk->sk_shutdown & RCV_SHUTDOWN ||
903 vsk->peer_shutdown & SEND_SHUTDOWN) {
904 mask |= EPOLLIN | EPOLLRDNORM;
905 }
906
907
908 if (sk->sk_state == TCP_ESTABLISHED) {
909 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
910 bool space_avail_now = false;
911 int ret = transport->notify_poll_out(
912 vsk, 1, &space_avail_now);
913 if (ret < 0) {
914 mask |= EPOLLERR;
915 } else {
916 if (space_avail_now)
917
918
919
920 mask |= EPOLLOUT | EPOLLWRNORM;
921
922 }
923 }
924 }
925
926
927
928
929
930 if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) {
931 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
932 mask |= EPOLLOUT | EPOLLWRNORM;
933
934 }
935
936 release_sock(sk);
937 }
938
939 return mask;
940}
941
942static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
943 size_t len)
944{
945 int err;
946 struct sock *sk;
947 struct vsock_sock *vsk;
948 struct sockaddr_vm *remote_addr;
949
950 if (msg->msg_flags & MSG_OOB)
951 return -EOPNOTSUPP;
952
953
954 err = 0;
955 sk = sock->sk;
956 vsk = vsock_sk(sk);
957
958 lock_sock(sk);
959
960 err = vsock_auto_bind(vsk);
961 if (err)
962 goto out;
963
964
965
966
967
968 if (msg->msg_name &&
969 vsock_addr_cast(msg->msg_name, msg->msg_namelen,
970 &remote_addr) == 0) {
971
972
973
974
975 if (remote_addr->svm_cid == VMADDR_CID_ANY)
976 remote_addr->svm_cid = transport->get_local_cid();
977
978 if (!vsock_addr_bound(remote_addr)) {
979 err = -EINVAL;
980 goto out;
981 }
982 } else if (sock->state == SS_CONNECTED) {
983 remote_addr = &vsk->remote_addr;
984
985 if (remote_addr->svm_cid == VMADDR_CID_ANY)
986 remote_addr->svm_cid = transport->get_local_cid();
987
988
989
990
991 if (!vsock_addr_bound(&vsk->remote_addr)) {
992 err = -EINVAL;
993 goto out;
994 }
995 } else {
996 err = -EINVAL;
997 goto out;
998 }
999
1000 if (!transport->dgram_allow(remote_addr->svm_cid,
1001 remote_addr->svm_port)) {
1002 err = -EINVAL;
1003 goto out;
1004 }
1005
1006 err = transport->dgram_enqueue(vsk, remote_addr, msg, len);
1007
1008out:
1009 release_sock(sk);
1010 return err;
1011}
1012
1013static int vsock_dgram_connect(struct socket *sock,
1014 struct sockaddr *addr, int addr_len, int flags)
1015{
1016 int err;
1017 struct sock *sk;
1018 struct vsock_sock *vsk;
1019 struct sockaddr_vm *remote_addr;
1020
1021 sk = sock->sk;
1022 vsk = vsock_sk(sk);
1023
1024 err = vsock_addr_cast(addr, addr_len, &remote_addr);
1025 if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) {
1026 lock_sock(sk);
1027 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY,
1028 VMADDR_PORT_ANY);
1029 sock->state = SS_UNCONNECTED;
1030 release_sock(sk);
1031 return 0;
1032 } else if (err != 0)
1033 return -EINVAL;
1034
1035 lock_sock(sk);
1036
1037 err = vsock_auto_bind(vsk);
1038 if (err)
1039 goto out;
1040
1041 if (!transport->dgram_allow(remote_addr->svm_cid,
1042 remote_addr->svm_port)) {
1043 err = -EINVAL;
1044 goto out;
1045 }
1046
1047 memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr));
1048 sock->state = SS_CONNECTED;
1049
1050out:
1051 release_sock(sk);
1052 return err;
1053}
1054
1055static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
1056 size_t len, int flags)
1057{
1058 return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags);
1059}
1060
1061static const struct proto_ops vsock_dgram_ops = {
1062 .family = PF_VSOCK,
1063 .owner = THIS_MODULE,
1064 .release = vsock_release,
1065 .bind = vsock_bind,
1066 .connect = vsock_dgram_connect,
1067 .socketpair = sock_no_socketpair,
1068 .accept = sock_no_accept,
1069 .getname = vsock_getname,
1070 .poll = vsock_poll,
1071 .ioctl = sock_no_ioctl,
1072 .listen = sock_no_listen,
1073 .shutdown = vsock_shutdown,
1074 .setsockopt = sock_no_setsockopt,
1075 .getsockopt = sock_no_getsockopt,
1076 .sendmsg = vsock_dgram_sendmsg,
1077 .recvmsg = vsock_dgram_recvmsg,
1078 .mmap = sock_no_mmap,
1079 .sendpage = sock_no_sendpage,
1080};
1081
1082static int vsock_transport_cancel_pkt(struct vsock_sock *vsk)
1083{
1084 if (!transport->cancel_pkt)
1085 return -EOPNOTSUPP;
1086
1087 return transport->cancel_pkt(vsk);
1088}
1089
1090static void vsock_connect_timeout(struct work_struct *work)
1091{
1092 struct sock *sk;
1093 struct vsock_sock *vsk;
1094 int cancel = 0;
1095
1096 vsk = container_of(work, struct vsock_sock, connect_work.work);
1097 sk = sk_vsock(vsk);
1098
1099 lock_sock(sk);
1100 if (sk->sk_state == TCP_SYN_SENT &&
1101 (sk->sk_shutdown != SHUTDOWN_MASK)) {
1102 sk->sk_state = TCP_CLOSE;
1103 sk->sk_err = ETIMEDOUT;
1104 sk->sk_error_report(sk);
1105 cancel = 1;
1106 }
1107 release_sock(sk);
1108 if (cancel)
1109 vsock_transport_cancel_pkt(vsk);
1110
1111 sock_put(sk);
1112}
1113
1114static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
1115 int addr_len, int flags)
1116{
1117 int err;
1118 struct sock *sk;
1119 struct vsock_sock *vsk;
1120 struct sockaddr_vm *remote_addr;
1121 long timeout;
1122 DEFINE_WAIT(wait);
1123
1124 err = 0;
1125 sk = sock->sk;
1126 vsk = vsock_sk(sk);
1127
1128 lock_sock(sk);
1129
1130
1131 switch (sock->state) {
1132 case SS_CONNECTED:
1133 err = -EISCONN;
1134 goto out;
1135 case SS_DISCONNECTING:
1136 err = -EINVAL;
1137 goto out;
1138 case SS_CONNECTING:
1139
1140
1141
1142
1143
1144
1145 err = -EALREADY;
1146 break;
1147 default:
1148 if ((sk->sk_state == TCP_LISTEN) ||
1149 vsock_addr_cast(addr, addr_len, &remote_addr) != 0) {
1150 err = -EINVAL;
1151 goto out;
1152 }
1153
1154
1155
1156
1157 if (!transport->stream_allow(remote_addr->svm_cid,
1158 remote_addr->svm_port)) {
1159 err = -ENETUNREACH;
1160 goto out;
1161 }
1162
1163
1164 memcpy(&vsk->remote_addr, remote_addr,
1165 sizeof(vsk->remote_addr));
1166
1167 err = vsock_auto_bind(vsk);
1168 if (err)
1169 goto out;
1170
1171 sk->sk_state = TCP_SYN_SENT;
1172
1173 err = transport->connect(vsk);
1174 if (err < 0)
1175 goto out;
1176
1177
1178
1179
1180 sock->state = SS_CONNECTING;
1181 err = -EINPROGRESS;
1182 }
1183
1184
1185
1186
1187
1188 timeout = vsk->connect_timeout;
1189 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1190
1191 while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) {
1192 if (flags & O_NONBLOCK) {
1193
1194
1195
1196
1197
1198
1199 sock_hold(sk);
1200 schedule_delayed_work(&vsk->connect_work, timeout);
1201
1202
1203 goto out_wait;
1204 }
1205
1206 release_sock(sk);
1207 timeout = schedule_timeout(timeout);
1208 lock_sock(sk);
1209
1210 if (signal_pending(current)) {
1211 err = sock_intr_errno(timeout);
1212 sk->sk_state = TCP_CLOSE;
1213 sock->state = SS_UNCONNECTED;
1214 vsock_transport_cancel_pkt(vsk);
1215 goto out_wait;
1216 } else if (timeout == 0) {
1217 err = -ETIMEDOUT;
1218 sk->sk_state = TCP_CLOSE;
1219 sock->state = SS_UNCONNECTED;
1220 vsock_transport_cancel_pkt(vsk);
1221 goto out_wait;
1222 }
1223
1224 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1225 }
1226
1227 if (sk->sk_err) {
1228 err = -sk->sk_err;
1229 sk->sk_state = TCP_CLOSE;
1230 sock->state = SS_UNCONNECTED;
1231 } else {
1232 err = 0;
1233 }
1234
1235out_wait:
1236 finish_wait(sk_sleep(sk), &wait);
1237out:
1238 release_sock(sk);
1239 return err;
1240}
1241
1242static int vsock_accept(struct socket *sock, struct socket *newsock, int flags,
1243 bool kern)
1244{
1245 struct sock *listener;
1246 int err;
1247 struct sock *connected;
1248 struct vsock_sock *vconnected;
1249 long timeout;
1250 DEFINE_WAIT(wait);
1251
1252 err = 0;
1253 listener = sock->sk;
1254
1255 lock_sock(listener);
1256
1257 if (sock->type != SOCK_STREAM) {
1258 err = -EOPNOTSUPP;
1259 goto out;
1260 }
1261
1262 if (listener->sk_state != TCP_LISTEN) {
1263 err = -EINVAL;
1264 goto out;
1265 }
1266
1267
1268
1269
1270 timeout = sock_sndtimeo(listener, flags & O_NONBLOCK);
1271 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1272
1273 while ((connected = vsock_dequeue_accept(listener)) == NULL &&
1274 listener->sk_err == 0) {
1275 release_sock(listener);
1276 timeout = schedule_timeout(timeout);
1277 finish_wait(sk_sleep(listener), &wait);
1278 lock_sock(listener);
1279
1280 if (signal_pending(current)) {
1281 err = sock_intr_errno(timeout);
1282 goto out;
1283 } else if (timeout == 0) {
1284 err = -EAGAIN;
1285 goto out;
1286 }
1287
1288 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1289 }
1290 finish_wait(sk_sleep(listener), &wait);
1291
1292 if (listener->sk_err)
1293 err = -listener->sk_err;
1294
1295 if (connected) {
1296 listener->sk_ack_backlog--;
1297
1298 lock_sock_nested(connected, SINGLE_DEPTH_NESTING);
1299 vconnected = vsock_sk(connected);
1300
1301
1302
1303
1304
1305
1306
1307
1308 if (err) {
1309 vconnected->rejected = true;
1310 } else {
1311 newsock->state = SS_CONNECTED;
1312 sock_graft(connected, newsock);
1313 }
1314
1315 release_sock(connected);
1316 sock_put(connected);
1317 }
1318
1319out:
1320 release_sock(listener);
1321 return err;
1322}
1323
1324static int vsock_listen(struct socket *sock, int backlog)
1325{
1326 int err;
1327 struct sock *sk;
1328 struct vsock_sock *vsk;
1329
1330 sk = sock->sk;
1331
1332 lock_sock(sk);
1333
1334 if (sock->type != SOCK_STREAM) {
1335 err = -EOPNOTSUPP;
1336 goto out;
1337 }
1338
1339 if (sock->state != SS_UNCONNECTED) {
1340 err = -EINVAL;
1341 goto out;
1342 }
1343
1344 vsk = vsock_sk(sk);
1345
1346 if (!vsock_addr_bound(&vsk->local_addr)) {
1347 err = -EINVAL;
1348 goto out;
1349 }
1350
1351 sk->sk_max_ack_backlog = backlog;
1352 sk->sk_state = TCP_LISTEN;
1353
1354 err = 0;
1355
1356out:
1357 release_sock(sk);
1358 return err;
1359}
1360
1361static int vsock_stream_setsockopt(struct socket *sock,
1362 int level,
1363 int optname,
1364 char __user *optval,
1365 unsigned int optlen)
1366{
1367 int err;
1368 struct sock *sk;
1369 struct vsock_sock *vsk;
1370 u64 val;
1371
1372 if (level != AF_VSOCK)
1373 return -ENOPROTOOPT;
1374
1375#define COPY_IN(_v) \
1376 do { \
1377 if (optlen < sizeof(_v)) { \
1378 err = -EINVAL; \
1379 goto exit; \
1380 } \
1381 if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \
1382 err = -EFAULT; \
1383 goto exit; \
1384 } \
1385 } while (0)
1386
1387 err = 0;
1388 sk = sock->sk;
1389 vsk = vsock_sk(sk);
1390
1391 lock_sock(sk);
1392
1393 switch (optname) {
1394 case SO_VM_SOCKETS_BUFFER_SIZE:
1395 COPY_IN(val);
1396 transport->set_buffer_size(vsk, val);
1397 break;
1398
1399 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1400 COPY_IN(val);
1401 transport->set_max_buffer_size(vsk, val);
1402 break;
1403
1404 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1405 COPY_IN(val);
1406 transport->set_min_buffer_size(vsk, val);
1407 break;
1408
1409 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1410 struct __kernel_old_timeval tv;
1411 COPY_IN(tv);
1412 if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC &&
1413 tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) {
1414 vsk->connect_timeout = tv.tv_sec * HZ +
1415 DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ));
1416 if (vsk->connect_timeout == 0)
1417 vsk->connect_timeout =
1418 VSOCK_DEFAULT_CONNECT_TIMEOUT;
1419
1420 } else {
1421 err = -ERANGE;
1422 }
1423 break;
1424 }
1425
1426 default:
1427 err = -ENOPROTOOPT;
1428 break;
1429 }
1430
1431#undef COPY_IN
1432
1433exit:
1434 release_sock(sk);
1435 return err;
1436}
1437
1438static int vsock_stream_getsockopt(struct socket *sock,
1439 int level, int optname,
1440 char __user *optval,
1441 int __user *optlen)
1442{
1443 int err;
1444 int len;
1445 struct sock *sk;
1446 struct vsock_sock *vsk;
1447 u64 val;
1448
1449 if (level != AF_VSOCK)
1450 return -ENOPROTOOPT;
1451
1452 err = get_user(len, optlen);
1453 if (err != 0)
1454 return err;
1455
1456#define COPY_OUT(_v) \
1457 do { \
1458 if (len < sizeof(_v)) \
1459 return -EINVAL; \
1460 \
1461 len = sizeof(_v); \
1462 if (copy_to_user(optval, &_v, len) != 0) \
1463 return -EFAULT; \
1464 \
1465 } while (0)
1466
1467 err = 0;
1468 sk = sock->sk;
1469 vsk = vsock_sk(sk);
1470
1471 switch (optname) {
1472 case SO_VM_SOCKETS_BUFFER_SIZE:
1473 val = transport->get_buffer_size(vsk);
1474 COPY_OUT(val);
1475 break;
1476
1477 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1478 val = transport->get_max_buffer_size(vsk);
1479 COPY_OUT(val);
1480 break;
1481
1482 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1483 val = transport->get_min_buffer_size(vsk);
1484 COPY_OUT(val);
1485 break;
1486
1487 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1488 struct __kernel_old_timeval tv;
1489 tv.tv_sec = vsk->connect_timeout / HZ;
1490 tv.tv_usec =
1491 (vsk->connect_timeout -
1492 tv.tv_sec * HZ) * (1000000 / HZ);
1493 COPY_OUT(tv);
1494 break;
1495 }
1496 default:
1497 return -ENOPROTOOPT;
1498 }
1499
1500 err = put_user(len, optlen);
1501 if (err != 0)
1502 return -EFAULT;
1503
1504#undef COPY_OUT
1505
1506 return 0;
1507}
1508
1509static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
1510 size_t len)
1511{
1512 struct sock *sk;
1513 struct vsock_sock *vsk;
1514 ssize_t total_written;
1515 long timeout;
1516 int err;
1517 struct vsock_transport_send_notify_data send_data;
1518 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1519
1520 sk = sock->sk;
1521 vsk = vsock_sk(sk);
1522 total_written = 0;
1523 err = 0;
1524
1525 if (msg->msg_flags & MSG_OOB)
1526 return -EOPNOTSUPP;
1527
1528 lock_sock(sk);
1529
1530
1531 if (msg->msg_namelen) {
1532 err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP;
1533 goto out;
1534 }
1535
1536
1537 if (sk->sk_shutdown & SEND_SHUTDOWN ||
1538 vsk->peer_shutdown & RCV_SHUTDOWN) {
1539 err = -EPIPE;
1540 goto out;
1541 }
1542
1543 if (sk->sk_state != TCP_ESTABLISHED ||
1544 !vsock_addr_bound(&vsk->local_addr)) {
1545 err = -ENOTCONN;
1546 goto out;
1547 }
1548
1549 if (!vsock_addr_bound(&vsk->remote_addr)) {
1550 err = -EDESTADDRREQ;
1551 goto out;
1552 }
1553
1554
1555 timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1556
1557 err = transport->notify_send_init(vsk, &send_data);
1558 if (err < 0)
1559 goto out;
1560
1561 while (total_written < len) {
1562 ssize_t written;
1563
1564 add_wait_queue(sk_sleep(sk), &wait);
1565 while (vsock_stream_has_space(vsk) == 0 &&
1566 sk->sk_err == 0 &&
1567 !(sk->sk_shutdown & SEND_SHUTDOWN) &&
1568 !(vsk->peer_shutdown & RCV_SHUTDOWN)) {
1569
1570
1571 if (timeout == 0) {
1572 err = -EAGAIN;
1573 remove_wait_queue(sk_sleep(sk), &wait);
1574 goto out_err;
1575 }
1576
1577 err = transport->notify_send_pre_block(vsk, &send_data);
1578 if (err < 0) {
1579 remove_wait_queue(sk_sleep(sk), &wait);
1580 goto out_err;
1581 }
1582
1583 release_sock(sk);
1584 timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout);
1585 lock_sock(sk);
1586 if (signal_pending(current)) {
1587 err = sock_intr_errno(timeout);
1588 remove_wait_queue(sk_sleep(sk), &wait);
1589 goto out_err;
1590 } else if (timeout == 0) {
1591 err = -EAGAIN;
1592 remove_wait_queue(sk_sleep(sk), &wait);
1593 goto out_err;
1594 }
1595 }
1596 remove_wait_queue(sk_sleep(sk), &wait);
1597
1598
1599
1600
1601
1602 if (sk->sk_err) {
1603 err = -sk->sk_err;
1604 goto out_err;
1605 } else if ((sk->sk_shutdown & SEND_SHUTDOWN) ||
1606 (vsk->peer_shutdown & RCV_SHUTDOWN)) {
1607 err = -EPIPE;
1608 goto out_err;
1609 }
1610
1611 err = transport->notify_send_pre_enqueue(vsk, &send_data);
1612 if (err < 0)
1613 goto out_err;
1614
1615
1616
1617
1618
1619
1620
1621 written = transport->stream_enqueue(
1622 vsk, msg,
1623 len - total_written);
1624 if (written < 0) {
1625 err = -ENOMEM;
1626 goto out_err;
1627 }
1628
1629 total_written += written;
1630
1631 err = transport->notify_send_post_enqueue(
1632 vsk, written, &send_data);
1633 if (err < 0)
1634 goto out_err;
1635
1636 }
1637
1638out_err:
1639 if (total_written > 0)
1640 err = total_written;
1641out:
1642 release_sock(sk);
1643 return err;
1644}
1645
1646
1647static int
1648vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1649 int flags)
1650{
1651 struct sock *sk;
1652 struct vsock_sock *vsk;
1653 int err;
1654 size_t target;
1655 ssize_t copied;
1656 long timeout;
1657 struct vsock_transport_recv_notify_data recv_data;
1658
1659 DEFINE_WAIT(wait);
1660
1661 sk = sock->sk;
1662 vsk = vsock_sk(sk);
1663 err = 0;
1664
1665 lock_sock(sk);
1666
1667 if (sk->sk_state != TCP_ESTABLISHED) {
1668
1669
1670
1671
1672
1673 if (sock_flag(sk, SOCK_DONE))
1674 err = 0;
1675 else
1676 err = -ENOTCONN;
1677
1678 goto out;
1679 }
1680
1681 if (flags & MSG_OOB) {
1682 err = -EOPNOTSUPP;
1683 goto out;
1684 }
1685
1686
1687
1688
1689
1690 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1691 err = 0;
1692 goto out;
1693 }
1694
1695
1696
1697
1698 if (!len) {
1699 err = 0;
1700 goto out;
1701 }
1702
1703
1704
1705
1706
1707
1708
1709 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1710 if (target >= transport->stream_rcvhiwat(vsk)) {
1711 err = -ENOMEM;
1712 goto out;
1713 }
1714 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1715 copied = 0;
1716
1717 err = transport->notify_recv_init(vsk, target, &recv_data);
1718 if (err < 0)
1719 goto out;
1720
1721
1722 while (1) {
1723 s64 ready;
1724
1725 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1726 ready = vsock_stream_has_data(vsk);
1727
1728 if (ready == 0) {
1729 if (sk->sk_err != 0 ||
1730 (sk->sk_shutdown & RCV_SHUTDOWN) ||
1731 (vsk->peer_shutdown & SEND_SHUTDOWN)) {
1732 finish_wait(sk_sleep(sk), &wait);
1733 break;
1734 }
1735
1736 if (timeout == 0) {
1737 err = -EAGAIN;
1738 finish_wait(sk_sleep(sk), &wait);
1739 break;
1740 }
1741
1742 err = transport->notify_recv_pre_block(
1743 vsk, target, &recv_data);
1744 if (err < 0) {
1745 finish_wait(sk_sleep(sk), &wait);
1746 break;
1747 }
1748 release_sock(sk);
1749 timeout = schedule_timeout(timeout);
1750 lock_sock(sk);
1751
1752 if (signal_pending(current)) {
1753 err = sock_intr_errno(timeout);
1754 finish_wait(sk_sleep(sk), &wait);
1755 break;
1756 } else if (timeout == 0) {
1757 err = -EAGAIN;
1758 finish_wait(sk_sleep(sk), &wait);
1759 break;
1760 }
1761 } else {
1762 ssize_t read;
1763
1764 finish_wait(sk_sleep(sk), &wait);
1765
1766 if (ready < 0) {
1767
1768
1769
1770
1771
1772 err = -ENOMEM;
1773 goto out;
1774 }
1775
1776 err = transport->notify_recv_pre_dequeue(
1777 vsk, target, &recv_data);
1778 if (err < 0)
1779 break;
1780
1781 read = transport->stream_dequeue(
1782 vsk, msg,
1783 len - copied, flags);
1784 if (read < 0) {
1785 err = -ENOMEM;
1786 break;
1787 }
1788
1789 copied += read;
1790
1791 err = transport->notify_recv_post_dequeue(
1792 vsk, target, read,
1793 !(flags & MSG_PEEK), &recv_data);
1794 if (err < 0)
1795 goto out;
1796
1797 if (read >= target || flags & MSG_PEEK)
1798 break;
1799
1800 target -= read;
1801 }
1802 }
1803
1804 if (sk->sk_err)
1805 err = -sk->sk_err;
1806 else if (sk->sk_shutdown & RCV_SHUTDOWN)
1807 err = 0;
1808
1809 if (copied > 0)
1810 err = copied;
1811
1812out:
1813 release_sock(sk);
1814 return err;
1815}
1816
1817static const struct proto_ops vsock_stream_ops = {
1818 .family = PF_VSOCK,
1819 .owner = THIS_MODULE,
1820 .release = vsock_release,
1821 .bind = vsock_bind,
1822 .connect = vsock_stream_connect,
1823 .socketpair = sock_no_socketpair,
1824 .accept = vsock_accept,
1825 .getname = vsock_getname,
1826 .poll = vsock_poll,
1827 .ioctl = sock_no_ioctl,
1828 .listen = vsock_listen,
1829 .shutdown = vsock_shutdown,
1830 .setsockopt = vsock_stream_setsockopt,
1831 .getsockopt = vsock_stream_getsockopt,
1832 .sendmsg = vsock_stream_sendmsg,
1833 .recvmsg = vsock_stream_recvmsg,
1834 .mmap = sock_no_mmap,
1835 .sendpage = sock_no_sendpage,
1836};
1837
1838static int vsock_create(struct net *net, struct socket *sock,
1839 int protocol, int kern)
1840{
1841 if (!sock)
1842 return -EINVAL;
1843
1844 if (protocol && protocol != PF_VSOCK)
1845 return -EPROTONOSUPPORT;
1846
1847 switch (sock->type) {
1848 case SOCK_DGRAM:
1849 sock->ops = &vsock_dgram_ops;
1850 break;
1851 case SOCK_STREAM:
1852 sock->ops = &vsock_stream_ops;
1853 break;
1854 default:
1855 return -ESOCKTNOSUPPORT;
1856 }
1857
1858 sock->state = SS_UNCONNECTED;
1859
1860 return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM;
1861}
1862
1863static const struct net_proto_family vsock_family_ops = {
1864 .family = AF_VSOCK,
1865 .create = vsock_create,
1866 .owner = THIS_MODULE,
1867};
1868
1869static long vsock_dev_do_ioctl(struct file *filp,
1870 unsigned int cmd, void __user *ptr)
1871{
1872 u32 __user *p = ptr;
1873 int retval = 0;
1874
1875 switch (cmd) {
1876 case IOCTL_VM_SOCKETS_GET_LOCAL_CID:
1877 if (put_user(transport->get_local_cid(), p) != 0)
1878 retval = -EFAULT;
1879 break;
1880
1881 default:
1882 pr_err("Unknown ioctl %d\n", cmd);
1883 retval = -EINVAL;
1884 }
1885
1886 return retval;
1887}
1888
1889static long vsock_dev_ioctl(struct file *filp,
1890 unsigned int cmd, unsigned long arg)
1891{
1892 return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg);
1893}
1894
1895#ifdef CONFIG_COMPAT
1896static long vsock_dev_compat_ioctl(struct file *filp,
1897 unsigned int cmd, unsigned long arg)
1898{
1899 return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg));
1900}
1901#endif
1902
1903static const struct file_operations vsock_device_ops = {
1904 .owner = THIS_MODULE,
1905 .unlocked_ioctl = vsock_dev_ioctl,
1906#ifdef CONFIG_COMPAT
1907 .compat_ioctl = vsock_dev_compat_ioctl,
1908#endif
1909 .open = nonseekable_open,
1910};
1911
1912static struct miscdevice vsock_device = {
1913 .name = "vsock",
1914 .fops = &vsock_device_ops,
1915};
1916
1917int __vsock_core_init(const struct vsock_transport *t, struct module *owner)
1918{
1919 int err = mutex_lock_interruptible(&vsock_register_mutex);
1920
1921 if (err)
1922 return err;
1923
1924 if (transport) {
1925 err = -EBUSY;
1926 goto err_busy;
1927 }
1928
1929
1930
1931
1932 vsock_proto.owner = owner;
1933 transport = t;
1934
1935 vsock_device.minor = MISC_DYNAMIC_MINOR;
1936 err = misc_register(&vsock_device);
1937 if (err) {
1938 pr_err("Failed to register misc device\n");
1939 goto err_reset_transport;
1940 }
1941
1942 err = proto_register(&vsock_proto, 1);
1943 if (err) {
1944 pr_err("Cannot register vsock protocol\n");
1945 goto err_deregister_misc;
1946 }
1947
1948 err = sock_register(&vsock_family_ops);
1949 if (err) {
1950 pr_err("could not register af_vsock (%d) address family: %d\n",
1951 AF_VSOCK, err);
1952 goto err_unregister_proto;
1953 }
1954
1955 mutex_unlock(&vsock_register_mutex);
1956 return 0;
1957
1958err_unregister_proto:
1959 proto_unregister(&vsock_proto);
1960err_deregister_misc:
1961 misc_deregister(&vsock_device);
1962err_reset_transport:
1963 transport = NULL;
1964err_busy:
1965 mutex_unlock(&vsock_register_mutex);
1966 return err;
1967}
1968EXPORT_SYMBOL_GPL(__vsock_core_init);
1969
1970void vsock_core_exit(void)
1971{
1972 mutex_lock(&vsock_register_mutex);
1973
1974 misc_deregister(&vsock_device);
1975 sock_unregister(AF_VSOCK);
1976 proto_unregister(&vsock_proto);
1977
1978
1979 mb();
1980 transport = NULL;
1981
1982 mutex_unlock(&vsock_register_mutex);
1983}
1984EXPORT_SYMBOL_GPL(vsock_core_exit);
1985
1986const struct vsock_transport *vsock_core_get_transport(void)
1987{
1988
1989
1990
1991 return transport;
1992}
1993EXPORT_SYMBOL_GPL(vsock_core_get_transport);
1994
1995static void __exit vsock_exit(void)
1996{
1997
1998}
1999
2000module_init(vsock_init_tables);
2001module_exit(vsock_exit);
2002
2003MODULE_AUTHOR("VMware, Inc.");
2004MODULE_DESCRIPTION("VMware Virtual Socket Family");
2005MODULE_VERSION("1.0.2.0-k");
2006MODULE_LICENSE("GPL v2");
2007