1 // SPDX-License-Identifier: GPL-2.0-only
3 * VMware vSockets Driver
5 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
8 #include <linux/types.h>
9 #include <linux/bitops.h>
10 #include <linux/cred.h>
11 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/kmod.h>
15 #include <linux/list.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/net.h>
19 #include <linux/poll.h>
20 #include <linux/skbuff.h>
21 #include <linux/smp.h>
22 #include <linux/socket.h>
23 #include <linux/stddef.h>
24 #include <linux/unistd.h>
25 #include <linux/wait.h>
26 #include <linux/workqueue.h>
28 #include <net/af_vsock.h>
30 #include "vmci_transport_notify.h"
32 static int vmci_transport_recv_dgram_cb(void *data
, struct vmci_datagram
*dg
);
33 static int vmci_transport_recv_stream_cb(void *data
, struct vmci_datagram
*dg
);
34 static void vmci_transport_peer_detach_cb(u32 sub_id
,
35 const struct vmci_event_data
*ed
,
37 static void vmci_transport_recv_pkt_work(struct work_struct
*work
);
38 static void vmci_transport_cleanup(struct work_struct
*work
);
39 static int vmci_transport_recv_listen(struct sock
*sk
,
40 struct vmci_transport_packet
*pkt
);
41 static int vmci_transport_recv_connecting_server(
44 struct vmci_transport_packet
*pkt
);
45 static int vmci_transport_recv_connecting_client(
47 struct vmci_transport_packet
*pkt
);
48 static int vmci_transport_recv_connecting_client_negotiate(
50 struct vmci_transport_packet
*pkt
);
51 static int vmci_transport_recv_connecting_client_invalid(
53 struct vmci_transport_packet
*pkt
);
54 static int vmci_transport_recv_connected(struct sock
*sk
,
55 struct vmci_transport_packet
*pkt
);
56 static bool vmci_transport_old_proto_override(bool *old_pkt_proto
);
57 static u16
vmci_transport_new_proto_supported_versions(void);
58 static bool vmci_transport_proto_to_notify_struct(struct sock
*sk
, u16
*proto
,
61 struct vmci_transport_recv_pkt_info
{
62 struct work_struct work
;
64 struct vmci_transport_packet pkt
;
67 static LIST_HEAD(vmci_transport_cleanup_list
);
68 static DEFINE_SPINLOCK(vmci_transport_cleanup_lock
);
69 static DECLARE_WORK(vmci_transport_cleanup_work
, vmci_transport_cleanup
);
71 static struct vmci_handle vmci_transport_stream_handle
= { VMCI_INVALID_ID
,
73 static u32 vmci_transport_qp_resumed_sub_id
= VMCI_INVALID_ID
;
75 static int PROTOCOL_OVERRIDE
= -1;
77 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN 128
78 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE 262144
79 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX 262144
81 /* The default peer timeout indicates how long we will wait for a peer response
82 * to a control message.
84 #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
86 /* Helper function to convert from a VMCI error code to a VSock error code. */
88 static s32
vmci_transport_error_to_vsock_error(s32 vmci_error
)
91 case VMCI_ERROR_NO_MEM
:
93 case VMCI_ERROR_DUPLICATE_ENTRY
:
94 case VMCI_ERROR_ALREADY_EXISTS
:
96 case VMCI_ERROR_NO_ACCESS
:
98 case VMCI_ERROR_NO_RESOURCES
:
100 case VMCI_ERROR_INVALID_RESOURCE
:
101 return -EHOSTUNREACH
;
102 case VMCI_ERROR_INVALID_ARGS
:
109 static u32
vmci_transport_peer_rid(u32 peer_cid
)
111 if (VMADDR_CID_HYPERVISOR
== peer_cid
)
112 return VMCI_TRANSPORT_HYPERVISOR_PACKET_RID
;
114 return VMCI_TRANSPORT_PACKET_RID
;
118 vmci_transport_packet_init(struct vmci_transport_packet
*pkt
,
119 struct sockaddr_vm
*src
,
120 struct sockaddr_vm
*dst
,
124 struct vmci_transport_waiting_info
*wait
,
126 struct vmci_handle handle
)
128 /* We register the stream control handler as an any cid handle so we
129 * must always send from a source address of VMADDR_CID_ANY
131 pkt
->dg
.src
= vmci_make_handle(VMADDR_CID_ANY
,
132 VMCI_TRANSPORT_PACKET_RID
);
133 pkt
->dg
.dst
= vmci_make_handle(dst
->svm_cid
,
134 vmci_transport_peer_rid(dst
->svm_cid
));
135 pkt
->dg
.payload_size
= sizeof(*pkt
) - sizeof(pkt
->dg
);
136 pkt
->version
= VMCI_TRANSPORT_PACKET_VERSION
;
138 pkt
->src_port
= src
->svm_port
;
139 pkt
->dst_port
= dst
->svm_port
;
140 memset(&pkt
->proto
, 0, sizeof(pkt
->proto
));
141 memset(&pkt
->_reserved2
, 0, sizeof(pkt
->_reserved2
));
144 case VMCI_TRANSPORT_PACKET_TYPE_INVALID
:
148 case VMCI_TRANSPORT_PACKET_TYPE_REQUEST
:
149 case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE
:
153 case VMCI_TRANSPORT_PACKET_TYPE_OFFER
:
154 case VMCI_TRANSPORT_PACKET_TYPE_ATTACH
:
155 pkt
->u
.handle
= handle
;
158 case VMCI_TRANSPORT_PACKET_TYPE_WROTE
:
159 case VMCI_TRANSPORT_PACKET_TYPE_READ
:
160 case VMCI_TRANSPORT_PACKET_TYPE_RST
:
164 case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN
:
168 case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ
:
169 case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE
:
170 memcpy(&pkt
->u
.wait
, wait
, sizeof(pkt
->u
.wait
));
173 case VMCI_TRANSPORT_PACKET_TYPE_REQUEST2
:
174 case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2
:
182 vmci_transport_packet_get_addresses(struct vmci_transport_packet
*pkt
,
183 struct sockaddr_vm
*local
,
184 struct sockaddr_vm
*remote
)
186 vsock_addr_init(local
, pkt
->dg
.dst
.context
, pkt
->dst_port
);
187 vsock_addr_init(remote
, pkt
->dg
.src
.context
, pkt
->src_port
);
191 __vmci_transport_send_control_pkt(struct vmci_transport_packet
*pkt
,
192 struct sockaddr_vm
*src
,
193 struct sockaddr_vm
*dst
,
194 enum vmci_transport_packet_type type
,
197 struct vmci_transport_waiting_info
*wait
,
199 struct vmci_handle handle
,
204 vmci_transport_packet_init(pkt
, src
, dst
, type
, size
, mode
, wait
,
206 err
= vmci_datagram_send(&pkt
->dg
);
207 if (convert_error
&& (err
< 0))
208 return vmci_transport_error_to_vsock_error(err
);
214 vmci_transport_reply_control_pkt_fast(struct vmci_transport_packet
*pkt
,
215 enum vmci_transport_packet_type type
,
218 struct vmci_transport_waiting_info
*wait
,
219 struct vmci_handle handle
)
221 struct vmci_transport_packet reply
;
222 struct sockaddr_vm src
, dst
;
224 if (pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_RST
) {
227 vmci_transport_packet_get_addresses(pkt
, &src
, &dst
);
228 return __vmci_transport_send_control_pkt(&reply
, &src
, &dst
,
237 vmci_transport_send_control_pkt_bh(struct sockaddr_vm
*src
,
238 struct sockaddr_vm
*dst
,
239 enum vmci_transport_packet_type type
,
242 struct vmci_transport_waiting_info
*wait
,
243 struct vmci_handle handle
)
245 /* Note that it is safe to use a single packet across all CPUs since
246 * two tasklets of the same type are guaranteed to not ever run
247 * simultaneously. If that ever changes, or VMCI stops using tasklets,
248 * we can use per-cpu packets.
250 static struct vmci_transport_packet pkt
;
252 return __vmci_transport_send_control_pkt(&pkt
, src
, dst
, type
,
254 VSOCK_PROTO_INVALID
, handle
,
259 vmci_transport_alloc_send_control_pkt(struct sockaddr_vm
*src
,
260 struct sockaddr_vm
*dst
,
261 enum vmci_transport_packet_type type
,
264 struct vmci_transport_waiting_info
*wait
,
266 struct vmci_handle handle
)
268 struct vmci_transport_packet
*pkt
;
271 pkt
= kmalloc(sizeof(*pkt
), GFP_KERNEL
);
275 err
= __vmci_transport_send_control_pkt(pkt
, src
, dst
, type
, size
,
276 mode
, wait
, proto
, handle
,
284 vmci_transport_send_control_pkt(struct sock
*sk
,
285 enum vmci_transport_packet_type type
,
288 struct vmci_transport_waiting_info
*wait
,
290 struct vmci_handle handle
)
292 struct vsock_sock
*vsk
;
296 if (!vsock_addr_bound(&vsk
->local_addr
))
299 if (!vsock_addr_bound(&vsk
->remote_addr
))
302 return vmci_transport_alloc_send_control_pkt(&vsk
->local_addr
,
305 wait
, proto
, handle
);
308 static int vmci_transport_send_reset_bh(struct sockaddr_vm
*dst
,
309 struct sockaddr_vm
*src
,
310 struct vmci_transport_packet
*pkt
)
312 if (pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_RST
)
314 return vmci_transport_send_control_pkt_bh(
316 VMCI_TRANSPORT_PACKET_TYPE_RST
, 0,
317 0, NULL
, VMCI_INVALID_HANDLE
);
320 static int vmci_transport_send_reset(struct sock
*sk
,
321 struct vmci_transport_packet
*pkt
)
323 struct sockaddr_vm
*dst_ptr
;
324 struct sockaddr_vm dst
;
325 struct vsock_sock
*vsk
;
327 if (pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_RST
)
332 if (!vsock_addr_bound(&vsk
->local_addr
))
335 if (vsock_addr_bound(&vsk
->remote_addr
)) {
336 dst_ptr
= &vsk
->remote_addr
;
338 vsock_addr_init(&dst
, pkt
->dg
.src
.context
,
342 return vmci_transport_alloc_send_control_pkt(&vsk
->local_addr
, dst_ptr
,
343 VMCI_TRANSPORT_PACKET_TYPE_RST
,
344 0, 0, NULL
, VSOCK_PROTO_INVALID
,
345 VMCI_INVALID_HANDLE
);
348 static int vmci_transport_send_negotiate(struct sock
*sk
, size_t size
)
350 return vmci_transport_send_control_pkt(
352 VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE
,
355 VMCI_INVALID_HANDLE
);
358 static int vmci_transport_send_negotiate2(struct sock
*sk
, size_t size
,
361 return vmci_transport_send_control_pkt(
363 VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2
,
364 size
, 0, NULL
, version
,
365 VMCI_INVALID_HANDLE
);
368 static int vmci_transport_send_qp_offer(struct sock
*sk
,
369 struct vmci_handle handle
)
371 return vmci_transport_send_control_pkt(
372 sk
, VMCI_TRANSPORT_PACKET_TYPE_OFFER
, 0,
374 VSOCK_PROTO_INVALID
, handle
);
377 static int vmci_transport_send_attach(struct sock
*sk
,
378 struct vmci_handle handle
)
380 return vmci_transport_send_control_pkt(
381 sk
, VMCI_TRANSPORT_PACKET_TYPE_ATTACH
,
382 0, 0, NULL
, VSOCK_PROTO_INVALID
,
386 static int vmci_transport_reply_reset(struct vmci_transport_packet
*pkt
)
388 return vmci_transport_reply_control_pkt_fast(
390 VMCI_TRANSPORT_PACKET_TYPE_RST
,
392 VMCI_INVALID_HANDLE
);
395 static int vmci_transport_send_invalid_bh(struct sockaddr_vm
*dst
,
396 struct sockaddr_vm
*src
)
398 return vmci_transport_send_control_pkt_bh(
400 VMCI_TRANSPORT_PACKET_TYPE_INVALID
,
401 0, 0, NULL
, VMCI_INVALID_HANDLE
);
404 int vmci_transport_send_wrote_bh(struct sockaddr_vm
*dst
,
405 struct sockaddr_vm
*src
)
407 return vmci_transport_send_control_pkt_bh(
409 VMCI_TRANSPORT_PACKET_TYPE_WROTE
, 0,
410 0, NULL
, VMCI_INVALID_HANDLE
);
413 int vmci_transport_send_read_bh(struct sockaddr_vm
*dst
,
414 struct sockaddr_vm
*src
)
416 return vmci_transport_send_control_pkt_bh(
418 VMCI_TRANSPORT_PACKET_TYPE_READ
, 0,
419 0, NULL
, VMCI_INVALID_HANDLE
);
422 int vmci_transport_send_wrote(struct sock
*sk
)
424 return vmci_transport_send_control_pkt(
425 sk
, VMCI_TRANSPORT_PACKET_TYPE_WROTE
, 0,
426 0, NULL
, VSOCK_PROTO_INVALID
,
427 VMCI_INVALID_HANDLE
);
430 int vmci_transport_send_read(struct sock
*sk
)
432 return vmci_transport_send_control_pkt(
433 sk
, VMCI_TRANSPORT_PACKET_TYPE_READ
, 0,
434 0, NULL
, VSOCK_PROTO_INVALID
,
435 VMCI_INVALID_HANDLE
);
438 int vmci_transport_send_waiting_write(struct sock
*sk
,
439 struct vmci_transport_waiting_info
*wait
)
441 return vmci_transport_send_control_pkt(
442 sk
, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE
,
443 0, 0, wait
, VSOCK_PROTO_INVALID
,
444 VMCI_INVALID_HANDLE
);
447 int vmci_transport_send_waiting_read(struct sock
*sk
,
448 struct vmci_transport_waiting_info
*wait
)
450 return vmci_transport_send_control_pkt(
451 sk
, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ
,
452 0, 0, wait
, VSOCK_PROTO_INVALID
,
453 VMCI_INVALID_HANDLE
);
456 static int vmci_transport_shutdown(struct vsock_sock
*vsk
, int mode
)
458 return vmci_transport_send_control_pkt(
460 VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN
,
463 VMCI_INVALID_HANDLE
);
466 static int vmci_transport_send_conn_request(struct sock
*sk
, size_t size
)
468 return vmci_transport_send_control_pkt(sk
,
469 VMCI_TRANSPORT_PACKET_TYPE_REQUEST
,
472 VMCI_INVALID_HANDLE
);
475 static int vmci_transport_send_conn_request2(struct sock
*sk
, size_t size
,
478 return vmci_transport_send_control_pkt(
479 sk
, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2
,
480 size
, 0, NULL
, version
,
481 VMCI_INVALID_HANDLE
);
484 static struct sock
*vmci_transport_get_pending(
485 struct sock
*listener
,
486 struct vmci_transport_packet
*pkt
)
488 struct vsock_sock
*vlistener
;
489 struct vsock_sock
*vpending
;
490 struct sock
*pending
;
491 struct sockaddr_vm src
;
493 vsock_addr_init(&src
, pkt
->dg
.src
.context
, pkt
->src_port
);
495 vlistener
= vsock_sk(listener
);
497 list_for_each_entry(vpending
, &vlistener
->pending_links
,
499 if (vsock_addr_equals_addr(&src
, &vpending
->remote_addr
) &&
500 pkt
->dst_port
== vpending
->local_addr
.svm_port
) {
501 pending
= sk_vsock(vpending
);
513 static void vmci_transport_release_pending(struct sock
*pending
)
518 /* We allow two kinds of sockets to communicate with a restricted VM: 1)
519 * trusted sockets 2) sockets from applications running as the same user as the
520 * VM (this is only true for the host side and only when using hosted products)
523 static bool vmci_transport_is_trusted(struct vsock_sock
*vsock
, u32 peer_cid
)
525 return vsock
->trusted
||
526 vmci_is_context_owner(peer_cid
, vsock
->owner
->uid
);
529 /* We allow sending datagrams to and receiving datagrams from a restricted VM
530 * only if it is trusted as described in vmci_transport_is_trusted.
533 static bool vmci_transport_allow_dgram(struct vsock_sock
*vsock
, u32 peer_cid
)
535 if (VMADDR_CID_HYPERVISOR
== peer_cid
)
538 if (vsock
->cached_peer
!= peer_cid
) {
539 vsock
->cached_peer
= peer_cid
;
540 if (!vmci_transport_is_trusted(vsock
, peer_cid
) &&
541 (vmci_context_get_priv_flags(peer_cid
) &
542 VMCI_PRIVILEGE_FLAG_RESTRICTED
)) {
543 vsock
->cached_peer_allow_dgram
= false;
545 vsock
->cached_peer_allow_dgram
= true;
549 return vsock
->cached_peer_allow_dgram
;
553 vmci_transport_queue_pair_alloc(struct vmci_qp
**qpair
,
554 struct vmci_handle
*handle
,
557 u32 peer
, u32 flags
, bool trusted
)
562 /* Try to allocate our queue pair as trusted. This will only
563 * work if vsock is running in the host.
566 err
= vmci_qpair_alloc(qpair
, handle
, produce_size
,
569 VMCI_PRIVILEGE_FLAG_TRUSTED
);
570 if (err
!= VMCI_ERROR_NO_ACCESS
)
575 err
= vmci_qpair_alloc(qpair
, handle
, produce_size
, consume_size
,
576 peer
, flags
, VMCI_NO_PRIVILEGE_FLAGS
);
579 pr_err("Could not attach to queue pair with %d\n",
581 err
= vmci_transport_error_to_vsock_error(err
);
588 vmci_transport_datagram_create_hnd(u32 resource_id
,
590 vmci_datagram_recv_cb recv_cb
,
592 struct vmci_handle
*out_handle
)
596 /* Try to allocate our datagram handler as trusted. This will only work
597 * if vsock is running in the host.
600 err
= vmci_datagram_create_handle_priv(resource_id
, flags
,
601 VMCI_PRIVILEGE_FLAG_TRUSTED
,
603 client_data
, out_handle
);
605 if (err
== VMCI_ERROR_NO_ACCESS
)
606 err
= vmci_datagram_create_handle(resource_id
, flags
,
607 recv_cb
, client_data
,
613 /* This is invoked as part of a tasklet that's scheduled when the VMCI
614 * interrupt fires. This is run in bottom-half context and if it ever needs to
615 * sleep it should defer that work to a work queue.
618 static int vmci_transport_recv_dgram_cb(void *data
, struct vmci_datagram
*dg
)
623 struct vsock_sock
*vsk
;
625 sk
= (struct sock
*)data
;
627 /* This handler is privileged when this module is running on the host.
628 * We will get datagrams from all endpoints (even VMs that are in a
629 * restricted context). If we get one from a restricted context then
630 * the destination socket must be trusted.
632 * NOTE: We access the socket struct without holding the lock here.
633 * This is ok because the field we are interested is never modified
634 * outside of the create and destruct socket functions.
637 if (!vmci_transport_allow_dgram(vsk
, dg
->src
.context
))
638 return VMCI_ERROR_NO_ACCESS
;
640 size
= VMCI_DG_SIZE(dg
);
642 /* Attach the packet to the socket's receive queue as an sk_buff. */
643 skb
= alloc_skb(size
, GFP_ATOMIC
);
645 return VMCI_ERROR_NO_MEM
;
647 /* sk_receive_skb() will do a sock_put(), so hold here. */
650 memcpy(skb
->data
, dg
, size
);
651 sk_receive_skb(sk
, skb
, 0);
656 static bool vmci_transport_stream_allow(u32 cid
, u32 port
)
658 static const u32 non_socket_contexts
[] = {
663 BUILD_BUG_ON(sizeof(cid
) != sizeof(*non_socket_contexts
));
665 for (i
= 0; i
< ARRAY_SIZE(non_socket_contexts
); i
++) {
666 if (cid
== non_socket_contexts
[i
])
673 /* This is invoked as part of a tasklet that's scheduled when the VMCI
674 * interrupt fires. This is run in bottom-half context but it defers most of
675 * its work to the packet handling work queue.
678 static int vmci_transport_recv_stream_cb(void *data
, struct vmci_datagram
*dg
)
681 struct sockaddr_vm dst
;
682 struct sockaddr_vm src
;
683 struct vmci_transport_packet
*pkt
;
684 struct vsock_sock
*vsk
;
690 bh_process_pkt
= false;
692 /* Ignore incoming packets from contexts without sockets, or resources
693 * that aren't vsock implementations.
696 if (!vmci_transport_stream_allow(dg
->src
.context
, -1)
697 || vmci_transport_peer_rid(dg
->src
.context
) != dg
->src
.resource
)
698 return VMCI_ERROR_NO_ACCESS
;
700 if (VMCI_DG_SIZE(dg
) < sizeof(*pkt
))
701 /* Drop datagrams that do not contain full VSock packets. */
702 return VMCI_ERROR_INVALID_ARGS
;
704 pkt
= (struct vmci_transport_packet
*)dg
;
706 /* Find the socket that should handle this packet. First we look for a
707 * connected socket and if there is none we look for a socket bound to
708 * the destintation address.
710 vsock_addr_init(&src
, pkt
->dg
.src
.context
, pkt
->src_port
);
711 vsock_addr_init(&dst
, pkt
->dg
.dst
.context
, pkt
->dst_port
);
713 sk
= vsock_find_connected_socket(&src
, &dst
);
715 sk
= vsock_find_bound_socket(&dst
);
717 /* We could not find a socket for this specified
718 * address. If this packet is a RST, we just drop it.
719 * If it is another packet, we send a RST. Note that
720 * we do not send a RST reply to RSTs so that we do not
721 * continually send RSTs between two endpoints.
723 * Note that since this is a reply, dst is src and src
726 if (vmci_transport_send_reset_bh(&dst
, &src
, pkt
) < 0)
727 pr_err("unable to send reset\n");
729 err
= VMCI_ERROR_NOT_FOUND
;
734 /* If the received packet type is beyond all types known to this
735 * implementation, reply with an invalid message. Hopefully this will
736 * help when implementing backwards compatibility in the future.
738 if (pkt
->type
>= VMCI_TRANSPORT_PACKET_TYPE_MAX
) {
739 vmci_transport_send_invalid_bh(&dst
, &src
);
740 err
= VMCI_ERROR_INVALID_ARGS
;
744 /* This handler is privileged when this module is running on the host.
745 * We will get datagram connect requests from all endpoints (even VMs
746 * that are in a restricted context). If we get one from a restricted
747 * context then the destination socket must be trusted.
749 * NOTE: We access the socket struct without holding the lock here.
750 * This is ok because the field we are interested is never modified
751 * outside of the create and destruct socket functions.
754 if (!vmci_transport_allow_dgram(vsk
, pkt
->dg
.src
.context
)) {
755 err
= VMCI_ERROR_NO_ACCESS
;
759 /* We do most everything in a work queue, but let's fast path the
760 * notification of reads and writes to help data transfer performance.
761 * We can only do this if there is no process context code executing
762 * for this socket since that may change the state.
766 if (!sock_owned_by_user(sk
)) {
767 /* The local context ID may be out of date, update it. */
768 vsk
->local_addr
.svm_cid
= dst
.svm_cid
;
770 if (sk
->sk_state
== TCP_ESTABLISHED
)
771 vmci_trans(vsk
)->notify_ops
->handle_notify_pkt(
772 sk
, pkt
, true, &dst
, &src
,
778 if (!bh_process_pkt
) {
779 struct vmci_transport_recv_pkt_info
*recv_pkt_info
;
781 recv_pkt_info
= kmalloc(sizeof(*recv_pkt_info
), GFP_ATOMIC
);
782 if (!recv_pkt_info
) {
783 if (vmci_transport_send_reset_bh(&dst
, &src
, pkt
) < 0)
784 pr_err("unable to send reset\n");
786 err
= VMCI_ERROR_NO_MEM
;
790 recv_pkt_info
->sk
= sk
;
791 memcpy(&recv_pkt_info
->pkt
, pkt
, sizeof(recv_pkt_info
->pkt
));
792 INIT_WORK(&recv_pkt_info
->work
, vmci_transport_recv_pkt_work
);
794 schedule_work(&recv_pkt_info
->work
);
795 /* Clear sk so that the reference count incremented by one of
796 * the Find functions above is not decremented below. We need
797 * that reference count for the packet handler we've scheduled
810 static void vmci_transport_handle_detach(struct sock
*sk
)
812 struct vsock_sock
*vsk
;
815 if (!vmci_handle_is_invalid(vmci_trans(vsk
)->qp_handle
)) {
816 sock_set_flag(sk
, SOCK_DONE
);
818 /* On a detach the peer will not be sending or receiving
821 vsk
->peer_shutdown
= SHUTDOWN_MASK
;
823 /* We should not be sending anymore since the peer won't be
824 * there to receive, but we can still receive if there is data
825 * left in our consume queue. If the local endpoint is a host,
826 * we can't call vsock_stream_has_data, since that may block,
827 * but a host endpoint can't read data once the VM has
828 * detached, so there is no available data in that case.
830 if (vsk
->local_addr
.svm_cid
== VMADDR_CID_HOST
||
831 vsock_stream_has_data(vsk
) <= 0) {
832 if (sk
->sk_state
== TCP_SYN_SENT
) {
833 /* The peer may detach from a queue pair while
834 * we are still in the connecting state, i.e.,
835 * if the peer VM is killed after attaching to
836 * a queue pair, but before we complete the
837 * handshake. In that case, we treat the detach
838 * event like a reset.
841 sk
->sk_state
= TCP_CLOSE
;
842 sk
->sk_err
= ECONNRESET
;
843 sk
->sk_error_report(sk
);
846 sk
->sk_state
= TCP_CLOSE
;
848 sk
->sk_state_change(sk
);
852 static void vmci_transport_peer_detach_cb(u32 sub_id
,
853 const struct vmci_event_data
*e_data
,
856 struct vmci_transport
*trans
= client_data
;
857 const struct vmci_event_payload_qp
*e_payload
;
859 e_payload
= vmci_event_data_const_payload(e_data
);
861 /* XXX This is lame, we should provide a way to lookup sockets by
864 if (vmci_handle_is_invalid(e_payload
->handle
) ||
865 !vmci_handle_is_equal(trans
->qp_handle
, e_payload
->handle
))
868 /* We don't ask for delayed CBs when we subscribe to this event (we
869 * pass 0 as flags to vmci_event_subscribe()). VMCI makes no
870 * guarantees in that case about what context we might be running in,
871 * so it could be BH or process, blockable or non-blockable. So we
872 * need to account for all possible contexts here.
874 spin_lock_bh(&trans
->lock
);
878 /* Apart from here, trans->lock is only grabbed as part of sk destruct,
879 * where trans->sk isn't locked.
881 bh_lock_sock(trans
->sk
);
883 vmci_transport_handle_detach(trans
->sk
);
885 bh_unlock_sock(trans
->sk
);
887 spin_unlock_bh(&trans
->lock
);
890 static void vmci_transport_qp_resumed_cb(u32 sub_id
,
891 const struct vmci_event_data
*e_data
,
894 vsock_for_each_connected_socket(vmci_transport_handle_detach
);
897 static void vmci_transport_recv_pkt_work(struct work_struct
*work
)
899 struct vmci_transport_recv_pkt_info
*recv_pkt_info
;
900 struct vmci_transport_packet
*pkt
;
904 container_of(work
, struct vmci_transport_recv_pkt_info
, work
);
905 sk
= recv_pkt_info
->sk
;
906 pkt
= &recv_pkt_info
->pkt
;
910 /* The local context ID may be out of date. */
911 vsock_sk(sk
)->local_addr
.svm_cid
= pkt
->dg
.dst
.context
;
913 switch (sk
->sk_state
) {
915 vmci_transport_recv_listen(sk
, pkt
);
918 /* Processing of pending connections for servers goes through
919 * the listening socket, so see vmci_transport_recv_listen()
922 vmci_transport_recv_connecting_client(sk
, pkt
);
924 case TCP_ESTABLISHED
:
925 vmci_transport_recv_connected(sk
, pkt
);
928 /* Because this function does not run in the same context as
929 * vmci_transport_recv_stream_cb it is possible that the
930 * socket has closed. We need to let the other side know or it
931 * could be sitting in a connect and hang forever. Send a
932 * reset to prevent that.
934 vmci_transport_send_reset(sk
, pkt
);
939 kfree(recv_pkt_info
);
940 /* Release reference obtained in the stream callback when we fetched
941 * this socket out of the bound or connected list.
946 static int vmci_transport_recv_listen(struct sock
*sk
,
947 struct vmci_transport_packet
*pkt
)
949 struct sock
*pending
;
950 struct vsock_sock
*vpending
;
953 bool old_request
= false;
954 bool old_pkt_proto
= false;
958 /* Because we are in the listen state, we could be receiving a packet
959 * for ourself or any previous connection requests that we received.
960 * If it's the latter, we try to find a socket in our list of pending
961 * connections and, if we do, call the appropriate handler for the
962 * state that that socket is in. Otherwise we try to service the
963 * connection request.
965 pending
= vmci_transport_get_pending(sk
, pkt
);
969 /* The local context ID may be out of date. */
970 vsock_sk(pending
)->local_addr
.svm_cid
= pkt
->dg
.dst
.context
;
972 switch (pending
->sk_state
) {
974 err
= vmci_transport_recv_connecting_server(sk
,
979 vmci_transport_send_reset(pending
, pkt
);
984 vsock_remove_pending(sk
, pending
);
986 release_sock(pending
);
987 vmci_transport_release_pending(pending
);
992 /* The listen state only accepts connection requests. Reply with a
993 * reset unless we received a reset.
996 if (!(pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_REQUEST
||
997 pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_REQUEST2
)) {
998 vmci_transport_reply_reset(pkt
);
1002 if (pkt
->u
.size
== 0) {
1003 vmci_transport_reply_reset(pkt
);
1007 /* If this socket can't accommodate this connection request, we send a
1008 * reset. Otherwise we create and initialize a child socket and reply
1009 * with a connection negotiation.
1011 if (sk
->sk_ack_backlog
>= sk
->sk_max_ack_backlog
) {
1012 vmci_transport_reply_reset(pkt
);
1013 return -ECONNREFUSED
;
1016 pending
= __vsock_create(sock_net(sk
), NULL
, sk
, GFP_KERNEL
,
1019 vmci_transport_send_reset(sk
, pkt
);
1023 vpending
= vsock_sk(pending
);
1025 vsock_addr_init(&vpending
->local_addr
, pkt
->dg
.dst
.context
,
1027 vsock_addr_init(&vpending
->remote_addr
, pkt
->dg
.src
.context
,
1030 /* If the proposed size fits within our min/max, accept it. Otherwise
1031 * propose our own size.
1033 if (pkt
->u
.size
>= vmci_trans(vpending
)->queue_pair_min_size
&&
1034 pkt
->u
.size
<= vmci_trans(vpending
)->queue_pair_max_size
) {
1035 qp_size
= pkt
->u
.size
;
1037 qp_size
= vmci_trans(vpending
)->queue_pair_size
;
1040 /* Figure out if we are using old or new requests based on the
1041 * overrides pkt types sent by our peer.
1043 if (vmci_transport_old_proto_override(&old_pkt_proto
)) {
1044 old_request
= old_pkt_proto
;
1046 if (pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_REQUEST
)
1048 else if (pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_REQUEST2
)
1049 old_request
= false;
1054 /* Handle a REQUEST (or override) */
1055 u16 version
= VSOCK_PROTO_INVALID
;
1056 if (vmci_transport_proto_to_notify_struct(
1057 pending
, &version
, true))
1058 err
= vmci_transport_send_negotiate(pending
, qp_size
);
1063 /* Handle a REQUEST2 (or override) */
1064 int proto_int
= pkt
->proto
;
1066 u16 active_proto_version
= 0;
1068 /* The list of possible protocols is the intersection of all
1069 * protocols the client supports ... plus all the protocols we
1072 proto_int
&= vmci_transport_new_proto_supported_versions();
1074 /* We choose the highest possible protocol version and use that
1077 pos
= fls(proto_int
);
1079 active_proto_version
= (1 << (pos
- 1));
1080 if (vmci_transport_proto_to_notify_struct(
1081 pending
, &active_proto_version
, false))
1082 err
= vmci_transport_send_negotiate2(pending
,
1084 active_proto_version
);
1094 vmci_transport_send_reset(sk
, pkt
);
1096 err
= vmci_transport_error_to_vsock_error(err
);
1100 vsock_add_pending(sk
, pending
);
1101 sk
->sk_ack_backlog
++;
1103 pending
->sk_state
= TCP_SYN_SENT
;
1104 vmci_trans(vpending
)->produce_size
=
1105 vmci_trans(vpending
)->consume_size
= qp_size
;
1106 vmci_trans(vpending
)->queue_pair_size
= qp_size
;
1108 vmci_trans(vpending
)->notify_ops
->process_request(pending
);
1110 /* We might never receive another message for this socket and it's not
1111 * connected to any process, so we have to ensure it gets cleaned up
1112 * ourself. Our delayed work function will take care of that. Note
1113 * that we do not ever cancel this function since we have few
1114 * guarantees about its state when calling cancel_delayed_work().
1115 * Instead we hold a reference on the socket for that function and make
1116 * it capable of handling cases where it needs to do nothing but
1117 * release that reference.
1119 vpending
->listener
= sk
;
1122 schedule_delayed_work(&vpending
->pending_work
, HZ
);
1129 vmci_transport_recv_connecting_server(struct sock
*listener
,
1130 struct sock
*pending
,
1131 struct vmci_transport_packet
*pkt
)
1133 struct vsock_sock
*vpending
;
1134 struct vmci_handle handle
;
1135 struct vmci_qp
*qpair
;
1142 vpending
= vsock_sk(pending
);
1143 detach_sub_id
= VMCI_INVALID_ID
;
1145 switch (pkt
->type
) {
1146 case VMCI_TRANSPORT_PACKET_TYPE_OFFER
:
1147 if (vmci_handle_is_invalid(pkt
->u
.handle
)) {
1148 vmci_transport_send_reset(pending
, pkt
);
1155 /* Close and cleanup the connection. */
1156 vmci_transport_send_reset(pending
, pkt
);
1158 err
= pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_RST
? 0 : -EINVAL
;
1162 /* In order to complete the connection we need to attach to the offered
1163 * queue pair and send an attach notification. We also subscribe to the
1164 * detach event so we know when our peer goes away, and we do that
1165 * before attaching so we don't miss an event. If all this succeeds,
1166 * we update our state and wakeup anything waiting in accept() for a
1170 /* We don't care about attach since we ensure the other side has
1171 * attached by specifying the ATTACH_ONLY flag below.
1173 err
= vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH
,
1174 vmci_transport_peer_detach_cb
,
1175 vmci_trans(vpending
), &detach_sub_id
);
1176 if (err
< VMCI_SUCCESS
) {
1177 vmci_transport_send_reset(pending
, pkt
);
1178 err
= vmci_transport_error_to_vsock_error(err
);
1183 vmci_trans(vpending
)->detach_sub_id
= detach_sub_id
;
1185 /* Now attach to the queue pair the client created. */
1186 handle
= pkt
->u
.handle
;
1188 /* vpending->local_addr always has a context id so we do not need to
1189 * worry about VMADDR_CID_ANY in this case.
1192 vpending
->remote_addr
.svm_cid
== vpending
->local_addr
.svm_cid
;
1193 flags
= VMCI_QPFLAG_ATTACH_ONLY
;
1194 flags
|= is_local
? VMCI_QPFLAG_LOCAL
: 0;
1196 err
= vmci_transport_queue_pair_alloc(
1199 vmci_trans(vpending
)->produce_size
,
1200 vmci_trans(vpending
)->consume_size
,
1201 pkt
->dg
.src
.context
,
1203 vmci_transport_is_trusted(
1205 vpending
->remote_addr
.svm_cid
));
1207 vmci_transport_send_reset(pending
, pkt
);
1212 vmci_trans(vpending
)->qp_handle
= handle
;
1213 vmci_trans(vpending
)->qpair
= qpair
;
1215 /* When we send the attach message, we must be ready to handle incoming
1216 * control messages on the newly connected socket. So we move the
1217 * pending socket to the connected state before sending the attach
1218 * message. Otherwise, an incoming packet triggered by the attach being
1219 * received by the peer may be processed concurrently with what happens
1220 * below after sending the attach message, and that incoming packet
1221 * will find the listening socket instead of the (currently) pending
1222 * socket. Note that enqueueing the socket increments the reference
1223 * count, so even if a reset comes before the connection is accepted,
1224 * the socket will be valid until it is removed from the queue.
1226 * If we fail sending the attach below, we remove the socket from the
1227 * connected list and move the socket to TCP_CLOSE before
1228 * releasing the lock, so a pending slow path processing of an incoming
1229 * packet will not see the socket in the connected state in that case.
1231 pending
->sk_state
= TCP_ESTABLISHED
;
1233 vsock_insert_connected(vpending
);
1235 /* Notify our peer of our attach. */
1236 err
= vmci_transport_send_attach(pending
, handle
);
1238 vsock_remove_connected(vpending
);
1239 pr_err("Could not send attach\n");
1240 vmci_transport_send_reset(pending
, pkt
);
1241 err
= vmci_transport_error_to_vsock_error(err
);
1246 /* We have a connection. Move the now connected socket from the
1247 * listener's pending list to the accept queue so callers of accept()
1250 vsock_remove_pending(listener
, pending
);
1251 vsock_enqueue_accept(listener
, pending
);
1253 /* Callers of accept() will be be waiting on the listening socket, not
1254 * the pending socket.
1256 listener
->sk_data_ready(listener
);
1261 pending
->sk_err
= skerr
;
1262 pending
->sk_state
= TCP_CLOSE
;
1263 /* As long as we drop our reference, all necessary cleanup will handle
1264 * when the cleanup function drops its reference and our destruct
1265 * implementation is called. Note that since the listen handler will
1266 * remove pending from the pending list upon our failure, the cleanup
1267 * function won't drop the additional reference, which is why we do it
1276 vmci_transport_recv_connecting_client(struct sock
*sk
,
1277 struct vmci_transport_packet
*pkt
)
1279 struct vsock_sock
*vsk
;
1285 switch (pkt
->type
) {
1286 case VMCI_TRANSPORT_PACKET_TYPE_ATTACH
:
1287 if (vmci_handle_is_invalid(pkt
->u
.handle
) ||
1288 !vmci_handle_is_equal(pkt
->u
.handle
,
1289 vmci_trans(vsk
)->qp_handle
)) {
1295 /* Signify the socket is connected and wakeup the waiter in
1296 * connect(). Also place the socket in the connected table for
1297 * accounting (it can already be found since it's in the bound
1300 sk
->sk_state
= TCP_ESTABLISHED
;
1301 sk
->sk_socket
->state
= SS_CONNECTED
;
1302 vsock_insert_connected(vsk
);
1303 sk
->sk_state_change(sk
);
1306 case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE
:
1307 case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2
:
1308 if (pkt
->u
.size
== 0
1309 || pkt
->dg
.src
.context
!= vsk
->remote_addr
.svm_cid
1310 || pkt
->src_port
!= vsk
->remote_addr
.svm_port
1311 || !vmci_handle_is_invalid(vmci_trans(vsk
)->qp_handle
)
1312 || vmci_trans(vsk
)->qpair
1313 || vmci_trans(vsk
)->produce_size
!= 0
1314 || vmci_trans(vsk
)->consume_size
!= 0
1315 || vmci_trans(vsk
)->detach_sub_id
!= VMCI_INVALID_ID
) {
1322 err
= vmci_transport_recv_connecting_client_negotiate(sk
, pkt
);
1329 case VMCI_TRANSPORT_PACKET_TYPE_INVALID
:
1330 err
= vmci_transport_recv_connecting_client_invalid(sk
, pkt
);
1337 case VMCI_TRANSPORT_PACKET_TYPE_RST
:
1338 /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to
1339 * continue processing here after they sent an INVALID packet.
1340 * This meant that we got a RST after the INVALID. We ignore a
1341 * RST after an INVALID. The common code doesn't send the RST
1342 * ... so we can hang if an old version of the common code
1343 * fails between getting a REQUEST and sending an OFFER back.
1344 * Not much we can do about it... except hope that it doesn't
1347 if (vsk
->ignore_connecting_rst
) {
1348 vsk
->ignore_connecting_rst
= false;
1357 /* Close and cleanup the connection. */
1366 vmci_transport_send_reset(sk
, pkt
);
1368 sk
->sk_state
= TCP_CLOSE
;
1370 sk
->sk_error_report(sk
);
1374 static int vmci_transport_recv_connecting_client_negotiate(
1376 struct vmci_transport_packet
*pkt
)
1379 struct vsock_sock
*vsk
;
1380 struct vmci_handle handle
;
1381 struct vmci_qp
*qpair
;
1385 bool old_proto
= true;
1390 handle
= VMCI_INVALID_HANDLE
;
1391 detach_sub_id
= VMCI_INVALID_ID
;
1393 /* If we have gotten here then we should be past the point where old
1394 * linux vsock could have sent the bogus rst.
1396 vsk
->sent_request
= false;
1397 vsk
->ignore_connecting_rst
= false;
1399 /* Verify that we're OK with the proposed queue pair size */
1400 if (pkt
->u
.size
< vmci_trans(vsk
)->queue_pair_min_size
||
1401 pkt
->u
.size
> vmci_trans(vsk
)->queue_pair_max_size
) {
1406 /* At this point we know the CID the peer is using to talk to us. */
1408 if (vsk
->local_addr
.svm_cid
== VMADDR_CID_ANY
)
1409 vsk
->local_addr
.svm_cid
= pkt
->dg
.dst
.context
;
1411 /* Setup the notify ops to be the highest supported version that both
1412 * the server and the client support.
1415 if (vmci_transport_old_proto_override(&old_pkt_proto
)) {
1416 old_proto
= old_pkt_proto
;
1418 if (pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE
)
1420 else if (pkt
->type
== VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2
)
1426 version
= VSOCK_PROTO_INVALID
;
1428 version
= pkt
->proto
;
1430 if (!vmci_transport_proto_to_notify_struct(sk
, &version
, old_proto
)) {
1435 /* Subscribe to detach events first.
1437 * XXX We attach once for each queue pair created for now so it is easy
1438 * to find the socket (it's provided), but later we should only
1439 * subscribe once and add a way to lookup sockets by queue pair handle.
1441 err
= vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH
,
1442 vmci_transport_peer_detach_cb
,
1443 vmci_trans(vsk
), &detach_sub_id
);
1444 if (err
< VMCI_SUCCESS
) {
1445 err
= vmci_transport_error_to_vsock_error(err
);
1449 /* Make VMCI select the handle for us. */
1450 handle
= VMCI_INVALID_HANDLE
;
1451 is_local
= vsk
->remote_addr
.svm_cid
== vsk
->local_addr
.svm_cid
;
1452 flags
= is_local
? VMCI_QPFLAG_LOCAL
: 0;
1454 err
= vmci_transport_queue_pair_alloc(&qpair
,
1458 vsk
->remote_addr
.svm_cid
,
1460 vmci_transport_is_trusted(
1463 remote_addr
.svm_cid
));
1467 err
= vmci_transport_send_qp_offer(sk
, handle
);
1469 err
= vmci_transport_error_to_vsock_error(err
);
1473 vmci_trans(vsk
)->qp_handle
= handle
;
1474 vmci_trans(vsk
)->qpair
= qpair
;
1476 vmci_trans(vsk
)->produce_size
= vmci_trans(vsk
)->consume_size
=
1479 vmci_trans(vsk
)->detach_sub_id
= detach_sub_id
;
1481 vmci_trans(vsk
)->notify_ops
->process_negotiate(sk
);
1486 if (detach_sub_id
!= VMCI_INVALID_ID
)
1487 vmci_event_unsubscribe(detach_sub_id
);
1489 if (!vmci_handle_is_invalid(handle
))
1490 vmci_qpair_detach(&qpair
);
1496 vmci_transport_recv_connecting_client_invalid(struct sock
*sk
,
1497 struct vmci_transport_packet
*pkt
)
1500 struct vsock_sock
*vsk
= vsock_sk(sk
);
1502 if (vsk
->sent_request
) {
1503 vsk
->sent_request
= false;
1504 vsk
->ignore_connecting_rst
= true;
1506 err
= vmci_transport_send_conn_request(
1507 sk
, vmci_trans(vsk
)->queue_pair_size
);
1509 err
= vmci_transport_error_to_vsock_error(err
);
1518 static int vmci_transport_recv_connected(struct sock
*sk
,
1519 struct vmci_transport_packet
*pkt
)
1521 struct vsock_sock
*vsk
;
1522 bool pkt_processed
= false;
1524 /* In cases where we are closing the connection, it's sufficient to
1525 * mark the state change (and maybe error) and wake up any waiting
1526 * threads. Since this is a connected socket, it's owned by a user
1527 * process and will be cleaned up when the failure is passed back on
1528 * the current or next system call. Our system call implementations
1529 * must therefore check for error and state changes on entry and when
1532 switch (pkt
->type
) {
1533 case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN
:
1537 vsk
->peer_shutdown
|= pkt
->u
.mode
;
1538 sk
->sk_state_change(sk
);
1542 case VMCI_TRANSPORT_PACKET_TYPE_RST
:
1544 /* It is possible that we sent our peer a message (e.g a
1545 * WAITING_READ) right before we got notified that the peer had
1546 * detached. If that happens then we can get a RST pkt back
1547 * from our peer even though there is data available for us to
1548 * read. In that case, don't shutdown the socket completely but
1549 * instead allow the local client to finish reading data off
1550 * the queuepair. Always treat a RST pkt in connected mode like
1553 sock_set_flag(sk
, SOCK_DONE
);
1554 vsk
->peer_shutdown
= SHUTDOWN_MASK
;
1555 if (vsock_stream_has_data(vsk
) <= 0)
1556 sk
->sk_state
= TCP_CLOSING
;
1558 sk
->sk_state_change(sk
);
1563 vmci_trans(vsk
)->notify_ops
->handle_notify_pkt(
1564 sk
, pkt
, false, NULL
, NULL
,
1575 static int vmci_transport_socket_init(struct vsock_sock
*vsk
,
1576 struct vsock_sock
*psk
)
1578 vsk
->trans
= kmalloc(sizeof(struct vmci_transport
), GFP_KERNEL
);
1582 vmci_trans(vsk
)->dg_handle
= VMCI_INVALID_HANDLE
;
1583 vmci_trans(vsk
)->qp_handle
= VMCI_INVALID_HANDLE
;
1584 vmci_trans(vsk
)->qpair
= NULL
;
1585 vmci_trans(vsk
)->produce_size
= vmci_trans(vsk
)->consume_size
= 0;
1586 vmci_trans(vsk
)->detach_sub_id
= VMCI_INVALID_ID
;
1587 vmci_trans(vsk
)->notify_ops
= NULL
;
1588 INIT_LIST_HEAD(&vmci_trans(vsk
)->elem
);
1589 vmci_trans(vsk
)->sk
= &vsk
->sk
;
1590 spin_lock_init(&vmci_trans(vsk
)->lock
);
1592 vmci_trans(vsk
)->queue_pair_size
=
1593 vmci_trans(psk
)->queue_pair_size
;
1594 vmci_trans(vsk
)->queue_pair_min_size
=
1595 vmci_trans(psk
)->queue_pair_min_size
;
1596 vmci_trans(vsk
)->queue_pair_max_size
=
1597 vmci_trans(psk
)->queue_pair_max_size
;
1599 vmci_trans(vsk
)->queue_pair_size
=
1600 VMCI_TRANSPORT_DEFAULT_QP_SIZE
;
1601 vmci_trans(vsk
)->queue_pair_min_size
=
1602 VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN
;
1603 vmci_trans(vsk
)->queue_pair_max_size
=
1604 VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX
;
1610 static void vmci_transport_free_resources(struct list_head
*transport_list
)
1612 while (!list_empty(transport_list
)) {
1613 struct vmci_transport
*transport
=
1614 list_first_entry(transport_list
, struct vmci_transport
,
1616 list_del(&transport
->elem
);
1618 if (transport
->detach_sub_id
!= VMCI_INVALID_ID
) {
1619 vmci_event_unsubscribe(transport
->detach_sub_id
);
1620 transport
->detach_sub_id
= VMCI_INVALID_ID
;
1623 if (!vmci_handle_is_invalid(transport
->qp_handle
)) {
1624 vmci_qpair_detach(&transport
->qpair
);
1625 transport
->qp_handle
= VMCI_INVALID_HANDLE
;
1626 transport
->produce_size
= 0;
1627 transport
->consume_size
= 0;
1634 static void vmci_transport_cleanup(struct work_struct
*work
)
1638 spin_lock_bh(&vmci_transport_cleanup_lock
);
1639 list_replace_init(&vmci_transport_cleanup_list
, &pending
);
1640 spin_unlock_bh(&vmci_transport_cleanup_lock
);
1641 vmci_transport_free_resources(&pending
);
1644 static void vmci_transport_destruct(struct vsock_sock
*vsk
)
1646 /* transport can be NULL if we hit a failure at init() time */
1647 if (!vmci_trans(vsk
))
1650 /* Ensure that the detach callback doesn't use the sk/vsk
1651 * we are about to destruct.
1653 spin_lock_bh(&vmci_trans(vsk
)->lock
);
1654 vmci_trans(vsk
)->sk
= NULL
;
1655 spin_unlock_bh(&vmci_trans(vsk
)->lock
);
1657 if (vmci_trans(vsk
)->notify_ops
)
1658 vmci_trans(vsk
)->notify_ops
->socket_destruct(vsk
);
1660 spin_lock_bh(&vmci_transport_cleanup_lock
);
1661 list_add(&vmci_trans(vsk
)->elem
, &vmci_transport_cleanup_list
);
1662 spin_unlock_bh(&vmci_transport_cleanup_lock
);
1663 schedule_work(&vmci_transport_cleanup_work
);
1668 static void vmci_transport_release(struct vsock_sock
*vsk
)
1670 vsock_remove_sock(vsk
);
1672 if (!vmci_handle_is_invalid(vmci_trans(vsk
)->dg_handle
)) {
1673 vmci_datagram_destroy_handle(vmci_trans(vsk
)->dg_handle
);
1674 vmci_trans(vsk
)->dg_handle
= VMCI_INVALID_HANDLE
;
1678 static int vmci_transport_dgram_bind(struct vsock_sock
*vsk
,
1679 struct sockaddr_vm
*addr
)
1685 /* VMCI will select a resource ID for us if we provide
1688 port
= addr
->svm_port
== VMADDR_PORT_ANY
?
1689 VMCI_INVALID_ID
: addr
->svm_port
;
1691 if (port
<= LAST_RESERVED_PORT
&& !capable(CAP_NET_BIND_SERVICE
))
1694 flags
= addr
->svm_cid
== VMADDR_CID_ANY
?
1695 VMCI_FLAG_ANYCID_DG_HND
: 0;
1697 err
= vmci_transport_datagram_create_hnd(port
, flags
,
1698 vmci_transport_recv_dgram_cb
,
1700 &vmci_trans(vsk
)->dg_handle
);
1701 if (err
< VMCI_SUCCESS
)
1702 return vmci_transport_error_to_vsock_error(err
);
1703 vsock_addr_init(&vsk
->local_addr
, addr
->svm_cid
,
1704 vmci_trans(vsk
)->dg_handle
.resource
);
1709 static int vmci_transport_dgram_enqueue(
1710 struct vsock_sock
*vsk
,
1711 struct sockaddr_vm
*remote_addr
,
1716 struct vmci_datagram
*dg
;
1718 if (len
> VMCI_MAX_DG_PAYLOAD_SIZE
)
1721 if (!vmci_transport_allow_dgram(vsk
, remote_addr
->svm_cid
))
1724 /* Allocate a buffer for the user's message and our packet header. */
1725 dg
= kmalloc(len
+ sizeof(*dg
), GFP_KERNEL
);
1729 memcpy_from_msg(VMCI_DG_PAYLOAD(dg
), msg
, len
);
1731 dg
->dst
= vmci_make_handle(remote_addr
->svm_cid
,
1732 remote_addr
->svm_port
);
1733 dg
->src
= vmci_make_handle(vsk
->local_addr
.svm_cid
,
1734 vsk
->local_addr
.svm_port
);
1735 dg
->payload_size
= len
;
1737 err
= vmci_datagram_send(dg
);
1740 return vmci_transport_error_to_vsock_error(err
);
1742 return err
- sizeof(*dg
);
1745 static int vmci_transport_dgram_dequeue(struct vsock_sock
*vsk
,
1746 struct msghdr
*msg
, size_t len
,
1751 struct vmci_datagram
*dg
;
1753 struct sk_buff
*skb
;
1755 noblock
= flags
& MSG_DONTWAIT
;
1757 if (flags
& MSG_OOB
|| flags
& MSG_ERRQUEUE
)
1760 /* Retrieve the head sk_buff from the socket's receive queue. */
1762 skb
= skb_recv_datagram(&vsk
->sk
, flags
, noblock
, &err
);
1766 dg
= (struct vmci_datagram
*)skb
->data
;
1768 /* err is 0, meaning we read zero bytes. */
1771 payload_len
= dg
->payload_size
;
1772 /* Ensure the sk_buff matches the payload size claimed in the packet. */
1773 if (payload_len
!= skb
->len
- sizeof(*dg
)) {
1778 if (payload_len
> len
) {
1780 msg
->msg_flags
|= MSG_TRUNC
;
1783 /* Place the datagram payload in the user's iovec. */
1784 err
= skb_copy_datagram_msg(skb
, sizeof(*dg
), msg
, payload_len
);
1788 if (msg
->msg_name
) {
1789 /* Provide the address of the sender. */
1790 DECLARE_SOCKADDR(struct sockaddr_vm
*, vm_addr
, msg
->msg_name
);
1791 vsock_addr_init(vm_addr
, dg
->src
.context
, dg
->src
.resource
);
1792 msg
->msg_namelen
= sizeof(*vm_addr
);
1797 skb_free_datagram(&vsk
->sk
, skb
);
1801 static bool vmci_transport_dgram_allow(u32 cid
, u32 port
)
1803 if (cid
== VMADDR_CID_HYPERVISOR
) {
1804 /* Registrations of PBRPC Servers do not modify VMX/Hypervisor
1805 * state and are allowed.
1807 return port
== VMCI_UNITY_PBRPC_REGISTER
;
1813 static int vmci_transport_connect(struct vsock_sock
*vsk
)
1816 bool old_pkt_proto
= false;
1817 struct sock
*sk
= &vsk
->sk
;
1819 if (vmci_transport_old_proto_override(&old_pkt_proto
) &&
1821 err
= vmci_transport_send_conn_request(
1822 sk
, vmci_trans(vsk
)->queue_pair_size
);
1824 sk
->sk_state
= TCP_CLOSE
;
1828 int supported_proto_versions
=
1829 vmci_transport_new_proto_supported_versions();
1830 err
= vmci_transport_send_conn_request2(
1831 sk
, vmci_trans(vsk
)->queue_pair_size
,
1832 supported_proto_versions
);
1834 sk
->sk_state
= TCP_CLOSE
;
1838 vsk
->sent_request
= true;
1844 static ssize_t
vmci_transport_stream_dequeue(
1845 struct vsock_sock
*vsk
,
1850 if (flags
& MSG_PEEK
)
1851 return vmci_qpair_peekv(vmci_trans(vsk
)->qpair
, msg
, len
, 0);
1853 return vmci_qpair_dequev(vmci_trans(vsk
)->qpair
, msg
, len
, 0);
1856 static ssize_t
vmci_transport_stream_enqueue(
1857 struct vsock_sock
*vsk
,
1861 return vmci_qpair_enquev(vmci_trans(vsk
)->qpair
, msg
, len
, 0);
1864 static s64
vmci_transport_stream_has_data(struct vsock_sock
*vsk
)
1866 return vmci_qpair_consume_buf_ready(vmci_trans(vsk
)->qpair
);
1869 static s64
vmci_transport_stream_has_space(struct vsock_sock
*vsk
)
1871 return vmci_qpair_produce_free_space(vmci_trans(vsk
)->qpair
);
1874 static u64
vmci_transport_stream_rcvhiwat(struct vsock_sock
*vsk
)
1876 return vmci_trans(vsk
)->consume_size
;
1879 static bool vmci_transport_stream_is_active(struct vsock_sock
*vsk
)
1881 return !vmci_handle_is_invalid(vmci_trans(vsk
)->qp_handle
);
1884 static u64
vmci_transport_get_buffer_size(struct vsock_sock
*vsk
)
1886 return vmci_trans(vsk
)->queue_pair_size
;
1889 static u64
vmci_transport_get_min_buffer_size(struct vsock_sock
*vsk
)
1891 return vmci_trans(vsk
)->queue_pair_min_size
;
1894 static u64
vmci_transport_get_max_buffer_size(struct vsock_sock
*vsk
)
1896 return vmci_trans(vsk
)->queue_pair_max_size
;
1899 static void vmci_transport_set_buffer_size(struct vsock_sock
*vsk
, u64 val
)
1901 if (val
< vmci_trans(vsk
)->queue_pair_min_size
)
1902 vmci_trans(vsk
)->queue_pair_min_size
= val
;
1903 if (val
> vmci_trans(vsk
)->queue_pair_max_size
)
1904 vmci_trans(vsk
)->queue_pair_max_size
= val
;
1905 vmci_trans(vsk
)->queue_pair_size
= val
;
1908 static void vmci_transport_set_min_buffer_size(struct vsock_sock
*vsk
,
1911 if (val
> vmci_trans(vsk
)->queue_pair_size
)
1912 vmci_trans(vsk
)->queue_pair_size
= val
;
1913 vmci_trans(vsk
)->queue_pair_min_size
= val
;
1916 static void vmci_transport_set_max_buffer_size(struct vsock_sock
*vsk
,
1919 if (val
< vmci_trans(vsk
)->queue_pair_size
)
1920 vmci_trans(vsk
)->queue_pair_size
= val
;
1921 vmci_trans(vsk
)->queue_pair_max_size
= val
;
1924 static int vmci_transport_notify_poll_in(
1925 struct vsock_sock
*vsk
,
1927 bool *data_ready_now
)
1929 return vmci_trans(vsk
)->notify_ops
->poll_in(
1930 &vsk
->sk
, target
, data_ready_now
);
1933 static int vmci_transport_notify_poll_out(
1934 struct vsock_sock
*vsk
,
1936 bool *space_available_now
)
1938 return vmci_trans(vsk
)->notify_ops
->poll_out(
1939 &vsk
->sk
, target
, space_available_now
);
1942 static int vmci_transport_notify_recv_init(
1943 struct vsock_sock
*vsk
,
1945 struct vsock_transport_recv_notify_data
*data
)
1947 return vmci_trans(vsk
)->notify_ops
->recv_init(
1949 (struct vmci_transport_recv_notify_data
*)data
);
1952 static int vmci_transport_notify_recv_pre_block(
1953 struct vsock_sock
*vsk
,
1955 struct vsock_transport_recv_notify_data
*data
)
1957 return vmci_trans(vsk
)->notify_ops
->recv_pre_block(
1959 (struct vmci_transport_recv_notify_data
*)data
);
1962 static int vmci_transport_notify_recv_pre_dequeue(
1963 struct vsock_sock
*vsk
,
1965 struct vsock_transport_recv_notify_data
*data
)
1967 return vmci_trans(vsk
)->notify_ops
->recv_pre_dequeue(
1969 (struct vmci_transport_recv_notify_data
*)data
);
1972 static int vmci_transport_notify_recv_post_dequeue(
1973 struct vsock_sock
*vsk
,
1977 struct vsock_transport_recv_notify_data
*data
)
1979 return vmci_trans(vsk
)->notify_ops
->recv_post_dequeue(
1980 &vsk
->sk
, target
, copied
, data_read
,
1981 (struct vmci_transport_recv_notify_data
*)data
);
1984 static int vmci_transport_notify_send_init(
1985 struct vsock_sock
*vsk
,
1986 struct vsock_transport_send_notify_data
*data
)
1988 return vmci_trans(vsk
)->notify_ops
->send_init(
1990 (struct vmci_transport_send_notify_data
*)data
);
1993 static int vmci_transport_notify_send_pre_block(
1994 struct vsock_sock
*vsk
,
1995 struct vsock_transport_send_notify_data
*data
)
1997 return vmci_trans(vsk
)->notify_ops
->send_pre_block(
1999 (struct vmci_transport_send_notify_data
*)data
);
2002 static int vmci_transport_notify_send_pre_enqueue(
2003 struct vsock_sock
*vsk
,
2004 struct vsock_transport_send_notify_data
*data
)
2006 return vmci_trans(vsk
)->notify_ops
->send_pre_enqueue(
2008 (struct vmci_transport_send_notify_data
*)data
);
2011 static int vmci_transport_notify_send_post_enqueue(
2012 struct vsock_sock
*vsk
,
2014 struct vsock_transport_send_notify_data
*data
)
2016 return vmci_trans(vsk
)->notify_ops
->send_post_enqueue(
2018 (struct vmci_transport_send_notify_data
*)data
);
2021 static bool vmci_transport_old_proto_override(bool *old_pkt_proto
)
2023 if (PROTOCOL_OVERRIDE
!= -1) {
2024 if (PROTOCOL_OVERRIDE
== 0)
2025 *old_pkt_proto
= true;
2027 *old_pkt_proto
= false;
2029 pr_info("Proto override in use\n");
2036 static bool vmci_transport_proto_to_notify_struct(struct sock
*sk
,
2040 struct vsock_sock
*vsk
= vsock_sk(sk
);
2042 if (old_pkt_proto
) {
2043 if (*proto
!= VSOCK_PROTO_INVALID
) {
2044 pr_err("Can't set both an old and new protocol\n");
2047 vmci_trans(vsk
)->notify_ops
= &vmci_transport_notify_pkt_ops
;
2052 case VSOCK_PROTO_PKT_ON_NOTIFY
:
2053 vmci_trans(vsk
)->notify_ops
=
2054 &vmci_transport_notify_pkt_q_state_ops
;
2057 pr_err("Unknown notify protocol version\n");
2062 vmci_trans(vsk
)->notify_ops
->socket_init(sk
);
2066 static u16
vmci_transport_new_proto_supported_versions(void)
2068 if (PROTOCOL_OVERRIDE
!= -1)
2069 return PROTOCOL_OVERRIDE
;
2071 return VSOCK_PROTO_ALL_SUPPORTED
;
2074 static u32
vmci_transport_get_local_cid(void)
2076 return vmci_get_context_id();
2079 static const struct vsock_transport vmci_transport
= {
2080 .init
= vmci_transport_socket_init
,
2081 .destruct
= vmci_transport_destruct
,
2082 .release
= vmci_transport_release
,
2083 .connect
= vmci_transport_connect
,
2084 .dgram_bind
= vmci_transport_dgram_bind
,
2085 .dgram_dequeue
= vmci_transport_dgram_dequeue
,
2086 .dgram_enqueue
= vmci_transport_dgram_enqueue
,
2087 .dgram_allow
= vmci_transport_dgram_allow
,
2088 .stream_dequeue
= vmci_transport_stream_dequeue
,
2089 .stream_enqueue
= vmci_transport_stream_enqueue
,
2090 .stream_has_data
= vmci_transport_stream_has_data
,
2091 .stream_has_space
= vmci_transport_stream_has_space
,
2092 .stream_rcvhiwat
= vmci_transport_stream_rcvhiwat
,
2093 .stream_is_active
= vmci_transport_stream_is_active
,
2094 .stream_allow
= vmci_transport_stream_allow
,
2095 .notify_poll_in
= vmci_transport_notify_poll_in
,
2096 .notify_poll_out
= vmci_transport_notify_poll_out
,
2097 .notify_recv_init
= vmci_transport_notify_recv_init
,
2098 .notify_recv_pre_block
= vmci_transport_notify_recv_pre_block
,
2099 .notify_recv_pre_dequeue
= vmci_transport_notify_recv_pre_dequeue
,
2100 .notify_recv_post_dequeue
= vmci_transport_notify_recv_post_dequeue
,
2101 .notify_send_init
= vmci_transport_notify_send_init
,
2102 .notify_send_pre_block
= vmci_transport_notify_send_pre_block
,
2103 .notify_send_pre_enqueue
= vmci_transport_notify_send_pre_enqueue
,
2104 .notify_send_post_enqueue
= vmci_transport_notify_send_post_enqueue
,
2105 .shutdown
= vmci_transport_shutdown
,
2106 .set_buffer_size
= vmci_transport_set_buffer_size
,
2107 .set_min_buffer_size
= vmci_transport_set_min_buffer_size
,
2108 .set_max_buffer_size
= vmci_transport_set_max_buffer_size
,
2109 .get_buffer_size
= vmci_transport_get_buffer_size
,
2110 .get_min_buffer_size
= vmci_transport_get_min_buffer_size
,
2111 .get_max_buffer_size
= vmci_transport_get_max_buffer_size
,
2112 .get_local_cid
= vmci_transport_get_local_cid
,
2115 static int __init
vmci_transport_init(void)
2119 /* Create the datagram handle that we will use to send and receive all
2120 * VSocket control messages for this context.
2122 err
= vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID
,
2123 VMCI_FLAG_ANYCID_DG_HND
,
2124 vmci_transport_recv_stream_cb
,
2126 &vmci_transport_stream_handle
);
2127 if (err
< VMCI_SUCCESS
) {
2128 pr_err("Unable to create datagram handle. (%d)\n", err
);
2129 return vmci_transport_error_to_vsock_error(err
);
2132 err
= vmci_event_subscribe(VMCI_EVENT_QP_RESUMED
,
2133 vmci_transport_qp_resumed_cb
,
2134 NULL
, &vmci_transport_qp_resumed_sub_id
);
2135 if (err
< VMCI_SUCCESS
) {
2136 pr_err("Unable to subscribe to resumed event. (%d)\n", err
);
2137 err
= vmci_transport_error_to_vsock_error(err
);
2138 vmci_transport_qp_resumed_sub_id
= VMCI_INVALID_ID
;
2139 goto err_destroy_stream_handle
;
2142 err
= vsock_core_init(&vmci_transport
);
2144 goto err_unsubscribe
;
2149 vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id
);
2150 err_destroy_stream_handle
:
2151 vmci_datagram_destroy_handle(vmci_transport_stream_handle
);
2154 module_init(vmci_transport_init
);
2156 static void __exit
vmci_transport_exit(void)
2158 cancel_work_sync(&vmci_transport_cleanup_work
);
2159 vmci_transport_free_resources(&vmci_transport_cleanup_list
);
2161 if (!vmci_handle_is_invalid(vmci_transport_stream_handle
)) {
2162 if (vmci_datagram_destroy_handle(
2163 vmci_transport_stream_handle
) != VMCI_SUCCESS
)
2164 pr_err("Couldn't destroy datagram handle\n");
2165 vmci_transport_stream_handle
= VMCI_INVALID_HANDLE
;
2168 if (vmci_transport_qp_resumed_sub_id
!= VMCI_INVALID_ID
) {
2169 vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id
);
2170 vmci_transport_qp_resumed_sub_id
= VMCI_INVALID_ID
;
2175 module_exit(vmci_transport_exit
);
2177 MODULE_AUTHOR("VMware, Inc.");
2178 MODULE_DESCRIPTION("VMCI transport for Virtual Sockets");
2179 MODULE_VERSION("1.0.5.0-k");
2180 MODULE_LICENSE("GPL v2");
2181 MODULE_ALIAS("vmware_vsock");
2182 MODULE_ALIAS_NETPROTO(PF_VSOCK
);