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TOMOYO Linux Cross Reference
Linux/net/vmw_vsock/vmci_transport.c

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  1 /*
  2  * VMware vSockets Driver
  3  *
  4  * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License as published by the Free
  8  * Software Foundation version 2 and no later version.
  9  *
 10  * This program is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13  * more details.
 14  */
 15 
 16 #include <linux/types.h>
 17 #include <linux/bitops.h>
 18 #include <linux/cred.h>
 19 #include <linux/init.h>
 20 #include <linux/io.h>
 21 #include <linux/kernel.h>
 22 #include <linux/kmod.h>
 23 #include <linux/list.h>
 24 #include <linux/miscdevice.h>
 25 #include <linux/module.h>
 26 #include <linux/mutex.h>
 27 #include <linux/net.h>
 28 #include <linux/poll.h>
 29 #include <linux/skbuff.h>
 30 #include <linux/smp.h>
 31 #include <linux/socket.h>
 32 #include <linux/stddef.h>
 33 #include <linux/unistd.h>
 34 #include <linux/wait.h>
 35 #include <linux/workqueue.h>
 36 #include <net/sock.h>
 37 #include <net/af_vsock.h>
 38 
 39 #include "vmci_transport_notify.h"
 40 
 41 static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg);
 42 static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg);
 43 static void vmci_transport_peer_attach_cb(u32 sub_id,
 44                                           const struct vmci_event_data *ed,
 45                                           void *client_data);
 46 static void vmci_transport_peer_detach_cb(u32 sub_id,
 47                                           const struct vmci_event_data *ed,
 48                                           void *client_data);
 49 static void vmci_transport_recv_pkt_work(struct work_struct *work);
 50 static int vmci_transport_recv_listen(struct sock *sk,
 51                                       struct vmci_transport_packet *pkt);
 52 static int vmci_transport_recv_connecting_server(
 53                                         struct sock *sk,
 54                                         struct sock *pending,
 55                                         struct vmci_transport_packet *pkt);
 56 static int vmci_transport_recv_connecting_client(
 57                                         struct sock *sk,
 58                                         struct vmci_transport_packet *pkt);
 59 static int vmci_transport_recv_connecting_client_negotiate(
 60                                         struct sock *sk,
 61                                         struct vmci_transport_packet *pkt);
 62 static int vmci_transport_recv_connecting_client_invalid(
 63                                         struct sock *sk,
 64                                         struct vmci_transport_packet *pkt);
 65 static int vmci_transport_recv_connected(struct sock *sk,
 66                                          struct vmci_transport_packet *pkt);
 67 static bool vmci_transport_old_proto_override(bool *old_pkt_proto);
 68 static u16 vmci_transport_new_proto_supported_versions(void);
 69 static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto,
 70                                                   bool old_pkt_proto);
 71 
 72 struct vmci_transport_recv_pkt_info {
 73         struct work_struct work;
 74         struct sock *sk;
 75         struct vmci_transport_packet pkt;
 76 };
 77 
 78 static struct vmci_handle vmci_transport_stream_handle = { VMCI_INVALID_ID,
 79                                                            VMCI_INVALID_ID };
 80 static u32 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
 81 
 82 static int PROTOCOL_OVERRIDE = -1;
 83 
 84 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN   128
 85 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE       262144
 86 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX   262144
 87 
 88 /* The default peer timeout indicates how long we will wait for a peer response
 89  * to a control message.
 90  */
 91 #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
 92 
 93 #define SS_LISTEN 255
 94 
 95 /* Helper function to convert from a VMCI error code to a VSock error code. */
 96 
 97 static s32 vmci_transport_error_to_vsock_error(s32 vmci_error)
 98 {
 99         int err;
100 
101         switch (vmci_error) {
102         case VMCI_ERROR_NO_MEM:
103                 err = ENOMEM;
104                 break;
105         case VMCI_ERROR_DUPLICATE_ENTRY:
106         case VMCI_ERROR_ALREADY_EXISTS:
107                 err = EADDRINUSE;
108                 break;
109         case VMCI_ERROR_NO_ACCESS:
110                 err = EPERM;
111                 break;
112         case VMCI_ERROR_NO_RESOURCES:
113                 err = ENOBUFS;
114                 break;
115         case VMCI_ERROR_INVALID_RESOURCE:
116                 err = EHOSTUNREACH;
117                 break;
118         case VMCI_ERROR_INVALID_ARGS:
119         default:
120                 err = EINVAL;
121         }
122 
123         return err > 0 ? -err : err;
124 }
125 
126 static u32 vmci_transport_peer_rid(u32 peer_cid)
127 {
128         if (VMADDR_CID_HYPERVISOR == peer_cid)
129                 return VMCI_TRANSPORT_HYPERVISOR_PACKET_RID;
130 
131         return VMCI_TRANSPORT_PACKET_RID;
132 }
133 
134 static inline void
135 vmci_transport_packet_init(struct vmci_transport_packet *pkt,
136                            struct sockaddr_vm *src,
137                            struct sockaddr_vm *dst,
138                            u8 type,
139                            u64 size,
140                            u64 mode,
141                            struct vmci_transport_waiting_info *wait,
142                            u16 proto,
143                            struct vmci_handle handle)
144 {
145         /* We register the stream control handler as an any cid handle so we
146          * must always send from a source address of VMADDR_CID_ANY
147          */
148         pkt->dg.src = vmci_make_handle(VMADDR_CID_ANY,
149                                        VMCI_TRANSPORT_PACKET_RID);
150         pkt->dg.dst = vmci_make_handle(dst->svm_cid,
151                                        vmci_transport_peer_rid(dst->svm_cid));
152         pkt->dg.payload_size = sizeof(*pkt) - sizeof(pkt->dg);
153         pkt->version = VMCI_TRANSPORT_PACKET_VERSION;
154         pkt->type = type;
155         pkt->src_port = src->svm_port;
156         pkt->dst_port = dst->svm_port;
157         memset(&pkt->proto, 0, sizeof(pkt->proto));
158         memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2));
159 
160         switch (pkt->type) {
161         case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
162                 pkt->u.size = 0;
163                 break;
164 
165         case VMCI_TRANSPORT_PACKET_TYPE_REQUEST:
166         case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE:
167                 pkt->u.size = size;
168                 break;
169 
170         case VMCI_TRANSPORT_PACKET_TYPE_OFFER:
171         case VMCI_TRANSPORT_PACKET_TYPE_ATTACH:
172                 pkt->u.handle = handle;
173                 break;
174 
175         case VMCI_TRANSPORT_PACKET_TYPE_WROTE:
176         case VMCI_TRANSPORT_PACKET_TYPE_READ:
177         case VMCI_TRANSPORT_PACKET_TYPE_RST:
178                 pkt->u.size = 0;
179                 break;
180 
181         case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN:
182                 pkt->u.mode = mode;
183                 break;
184 
185         case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ:
186         case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE:
187                 memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait));
188                 break;
189 
190         case VMCI_TRANSPORT_PACKET_TYPE_REQUEST2:
191         case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2:
192                 pkt->u.size = size;
193                 pkt->proto = proto;
194                 break;
195         }
196 }
197 
198 static inline void
199 vmci_transport_packet_get_addresses(struct vmci_transport_packet *pkt,
200                                     struct sockaddr_vm *local,
201                                     struct sockaddr_vm *remote)
202 {
203         vsock_addr_init(local, pkt->dg.dst.context, pkt->dst_port);
204         vsock_addr_init(remote, pkt->dg.src.context, pkt->src_port);
205 }
206 
207 static int
208 __vmci_transport_send_control_pkt(struct vmci_transport_packet *pkt,
209                                   struct sockaddr_vm *src,
210                                   struct sockaddr_vm *dst,
211                                   enum vmci_transport_packet_type type,
212                                   u64 size,
213                                   u64 mode,
214                                   struct vmci_transport_waiting_info *wait,
215                                   u16 proto,
216                                   struct vmci_handle handle,
217                                   bool convert_error)
218 {
219         int err;
220 
221         vmci_transport_packet_init(pkt, src, dst, type, size, mode, wait,
222                                    proto, handle);
223         err = vmci_datagram_send(&pkt->dg);
224         if (convert_error && (err < 0))
225                 return vmci_transport_error_to_vsock_error(err);
226 
227         return err;
228 }
229 
230 static int
231 vmci_transport_reply_control_pkt_fast(struct vmci_transport_packet *pkt,
232                                       enum vmci_transport_packet_type type,
233                                       u64 size,
234                                       u64 mode,
235                                       struct vmci_transport_waiting_info *wait,
236                                       struct vmci_handle handle)
237 {
238         struct vmci_transport_packet reply;
239         struct sockaddr_vm src, dst;
240 
241         if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) {
242                 return 0;
243         } else {
244                 vmci_transport_packet_get_addresses(pkt, &src, &dst);
245                 return __vmci_transport_send_control_pkt(&reply, &src, &dst,
246                                                          type,
247                                                          size, mode, wait,
248                                                          VSOCK_PROTO_INVALID,
249                                                          handle, true);
250         }
251 }
252 
253 static int
254 vmci_transport_send_control_pkt_bh(struct sockaddr_vm *src,
255                                    struct sockaddr_vm *dst,
256                                    enum vmci_transport_packet_type type,
257                                    u64 size,
258                                    u64 mode,
259                                    struct vmci_transport_waiting_info *wait,
260                                    struct vmci_handle handle)
261 {
262         /* Note that it is safe to use a single packet across all CPUs since
263          * two tasklets of the same type are guaranteed to not ever run
264          * simultaneously. If that ever changes, or VMCI stops using tasklets,
265          * we can use per-cpu packets.
266          */
267         static struct vmci_transport_packet pkt;
268 
269         return __vmci_transport_send_control_pkt(&pkt, src, dst, type,
270                                                  size, mode, wait,
271                                                  VSOCK_PROTO_INVALID, handle,
272                                                  false);
273 }
274 
275 static int
276 vmci_transport_send_control_pkt(struct sock *sk,
277                                 enum vmci_transport_packet_type type,
278                                 u64 size,
279                                 u64 mode,
280                                 struct vmci_transport_waiting_info *wait,
281                                 u16 proto,
282                                 struct vmci_handle handle)
283 {
284         struct vmci_transport_packet *pkt;
285         struct vsock_sock *vsk;
286         int err;
287 
288         vsk = vsock_sk(sk);
289 
290         if (!vsock_addr_bound(&vsk->local_addr))
291                 return -EINVAL;
292 
293         if (!vsock_addr_bound(&vsk->remote_addr))
294                 return -EINVAL;
295 
296         pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
297         if (!pkt)
298                 return -ENOMEM;
299 
300         err = __vmci_transport_send_control_pkt(pkt, &vsk->local_addr,
301                                                 &vsk->remote_addr, type, size,
302                                                 mode, wait, proto, handle,
303                                                 true);
304         kfree(pkt);
305 
306         return err;
307 }
308 
309 static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst,
310                                         struct sockaddr_vm *src,
311                                         struct vmci_transport_packet *pkt)
312 {
313         if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST)
314                 return 0;
315         return vmci_transport_send_control_pkt_bh(
316                                         dst, src,
317                                         VMCI_TRANSPORT_PACKET_TYPE_RST, 0,
318                                         0, NULL, VMCI_INVALID_HANDLE);
319 }
320 
321 static int vmci_transport_send_reset(struct sock *sk,
322                                      struct vmci_transport_packet *pkt)
323 {
324         if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST)
325                 return 0;
326         return vmci_transport_send_control_pkt(sk,
327                                         VMCI_TRANSPORT_PACKET_TYPE_RST,
328                                         0, 0, NULL, VSOCK_PROTO_INVALID,
329                                         VMCI_INVALID_HANDLE);
330 }
331 
332 static int vmci_transport_send_negotiate(struct sock *sk, size_t size)
333 {
334         return vmci_transport_send_control_pkt(
335                                         sk,
336                                         VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE,
337                                         size, 0, NULL,
338                                         VSOCK_PROTO_INVALID,
339                                         VMCI_INVALID_HANDLE);
340 }
341 
342 static int vmci_transport_send_negotiate2(struct sock *sk, size_t size,
343                                           u16 version)
344 {
345         return vmci_transport_send_control_pkt(
346                                         sk,
347                                         VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2,
348                                         size, 0, NULL, version,
349                                         VMCI_INVALID_HANDLE);
350 }
351 
352 static int vmci_transport_send_qp_offer(struct sock *sk,
353                                         struct vmci_handle handle)
354 {
355         return vmci_transport_send_control_pkt(
356                                         sk, VMCI_TRANSPORT_PACKET_TYPE_OFFER, 0,
357                                         0, NULL,
358                                         VSOCK_PROTO_INVALID, handle);
359 }
360 
361 static int vmci_transport_send_attach(struct sock *sk,
362                                       struct vmci_handle handle)
363 {
364         return vmci_transport_send_control_pkt(
365                                         sk, VMCI_TRANSPORT_PACKET_TYPE_ATTACH,
366                                         0, 0, NULL, VSOCK_PROTO_INVALID,
367                                         handle);
368 }
369 
370 static int vmci_transport_reply_reset(struct vmci_transport_packet *pkt)
371 {
372         return vmci_transport_reply_control_pkt_fast(
373                                                 pkt,
374                                                 VMCI_TRANSPORT_PACKET_TYPE_RST,
375                                                 0, 0, NULL,
376                                                 VMCI_INVALID_HANDLE);
377 }
378 
379 static int vmci_transport_send_invalid_bh(struct sockaddr_vm *dst,
380                                           struct sockaddr_vm *src)
381 {
382         return vmci_transport_send_control_pkt_bh(
383                                         dst, src,
384                                         VMCI_TRANSPORT_PACKET_TYPE_INVALID,
385                                         0, 0, NULL, VMCI_INVALID_HANDLE);
386 }
387 
388 int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst,
389                                  struct sockaddr_vm *src)
390 {
391         return vmci_transport_send_control_pkt_bh(
392                                         dst, src,
393                                         VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0,
394                                         0, NULL, VMCI_INVALID_HANDLE);
395 }
396 
397 int vmci_transport_send_read_bh(struct sockaddr_vm *dst,
398                                 struct sockaddr_vm *src)
399 {
400         return vmci_transport_send_control_pkt_bh(
401                                         dst, src,
402                                         VMCI_TRANSPORT_PACKET_TYPE_READ, 0,
403                                         0, NULL, VMCI_INVALID_HANDLE);
404 }
405 
406 int vmci_transport_send_wrote(struct sock *sk)
407 {
408         return vmci_transport_send_control_pkt(
409                                         sk, VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0,
410                                         0, NULL, VSOCK_PROTO_INVALID,
411                                         VMCI_INVALID_HANDLE);
412 }
413 
414 int vmci_transport_send_read(struct sock *sk)
415 {
416         return vmci_transport_send_control_pkt(
417                                         sk, VMCI_TRANSPORT_PACKET_TYPE_READ, 0,
418                                         0, NULL, VSOCK_PROTO_INVALID,
419                                         VMCI_INVALID_HANDLE);
420 }
421 
422 int vmci_transport_send_waiting_write(struct sock *sk,
423                                       struct vmci_transport_waiting_info *wait)
424 {
425         return vmci_transport_send_control_pkt(
426                                 sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE,
427                                 0, 0, wait, VSOCK_PROTO_INVALID,
428                                 VMCI_INVALID_HANDLE);
429 }
430 
431 int vmci_transport_send_waiting_read(struct sock *sk,
432                                      struct vmci_transport_waiting_info *wait)
433 {
434         return vmci_transport_send_control_pkt(
435                                 sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ,
436                                 0, 0, wait, VSOCK_PROTO_INVALID,
437                                 VMCI_INVALID_HANDLE);
438 }
439 
440 static int vmci_transport_shutdown(struct vsock_sock *vsk, int mode)
441 {
442         return vmci_transport_send_control_pkt(
443                                         &vsk->sk,
444                                         VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN,
445                                         0, mode, NULL,
446                                         VSOCK_PROTO_INVALID,
447                                         VMCI_INVALID_HANDLE);
448 }
449 
450 static int vmci_transport_send_conn_request(struct sock *sk, size_t size)
451 {
452         return vmci_transport_send_control_pkt(sk,
453                                         VMCI_TRANSPORT_PACKET_TYPE_REQUEST,
454                                         size, 0, NULL,
455                                         VSOCK_PROTO_INVALID,
456                                         VMCI_INVALID_HANDLE);
457 }
458 
459 static int vmci_transport_send_conn_request2(struct sock *sk, size_t size,
460                                              u16 version)
461 {
462         return vmci_transport_send_control_pkt(
463                                         sk, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2,
464                                         size, 0, NULL, version,
465                                         VMCI_INVALID_HANDLE);
466 }
467 
468 static struct sock *vmci_transport_get_pending(
469                                         struct sock *listener,
470                                         struct vmci_transport_packet *pkt)
471 {
472         struct vsock_sock *vlistener;
473         struct vsock_sock *vpending;
474         struct sock *pending;
475         struct sockaddr_vm src;
476 
477         vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port);
478 
479         vlistener = vsock_sk(listener);
480 
481         list_for_each_entry(vpending, &vlistener->pending_links,
482                             pending_links) {
483                 if (vsock_addr_equals_addr(&src, &vpending->remote_addr) &&
484                     pkt->dst_port == vpending->local_addr.svm_port) {
485                         pending = sk_vsock(vpending);
486                         sock_hold(pending);
487                         goto found;
488                 }
489         }
490 
491         pending = NULL;
492 found:
493         return pending;
494 
495 }
496 
497 static void vmci_transport_release_pending(struct sock *pending)
498 {
499         sock_put(pending);
500 }
501 
502 /* We allow two kinds of sockets to communicate with a restricted VM: 1)
503  * trusted sockets 2) sockets from applications running as the same user as the
504  * VM (this is only true for the host side and only when using hosted products)
505  */
506 
507 static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid)
508 {
509         return vsock->trusted ||
510                vmci_is_context_owner(peer_cid, vsock->owner->uid);
511 }
512 
513 /* We allow sending datagrams to and receiving datagrams from a restricted VM
514  * only if it is trusted as described in vmci_transport_is_trusted.
515  */
516 
517 static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid)
518 {
519         if (VMADDR_CID_HYPERVISOR == peer_cid)
520                 return true;
521 
522         if (vsock->cached_peer != peer_cid) {
523                 vsock->cached_peer = peer_cid;
524                 if (!vmci_transport_is_trusted(vsock, peer_cid) &&
525                     (vmci_context_get_priv_flags(peer_cid) &
526                      VMCI_PRIVILEGE_FLAG_RESTRICTED)) {
527                         vsock->cached_peer_allow_dgram = false;
528                 } else {
529                         vsock->cached_peer_allow_dgram = true;
530                 }
531         }
532 
533         return vsock->cached_peer_allow_dgram;
534 }
535 
536 static int
537 vmci_transport_queue_pair_alloc(struct vmci_qp **qpair,
538                                 struct vmci_handle *handle,
539                                 u64 produce_size,
540                                 u64 consume_size,
541                                 u32 peer, u32 flags, bool trusted)
542 {
543         int err = 0;
544 
545         if (trusted) {
546                 /* Try to allocate our queue pair as trusted. This will only
547                  * work if vsock is running in the host.
548                  */
549 
550                 err = vmci_qpair_alloc(qpair, handle, produce_size,
551                                        consume_size,
552                                        peer, flags,
553                                        VMCI_PRIVILEGE_FLAG_TRUSTED);
554                 if (err != VMCI_ERROR_NO_ACCESS)
555                         goto out;
556 
557         }
558 
559         err = vmci_qpair_alloc(qpair, handle, produce_size, consume_size,
560                                peer, flags, VMCI_NO_PRIVILEGE_FLAGS);
561 out:
562         if (err < 0) {
563                 pr_err("Could not attach to queue pair with %d\n",
564                        err);
565                 err = vmci_transport_error_to_vsock_error(err);
566         }
567 
568         return err;
569 }
570 
571 static int
572 vmci_transport_datagram_create_hnd(u32 resource_id,
573                                    u32 flags,
574                                    vmci_datagram_recv_cb recv_cb,
575                                    void *client_data,
576                                    struct vmci_handle *out_handle)
577 {
578         int err = 0;
579 
580         /* Try to allocate our datagram handler as trusted. This will only work
581          * if vsock is running in the host.
582          */
583 
584         err = vmci_datagram_create_handle_priv(resource_id, flags,
585                                                VMCI_PRIVILEGE_FLAG_TRUSTED,
586                                                recv_cb,
587                                                client_data, out_handle);
588 
589         if (err == VMCI_ERROR_NO_ACCESS)
590                 err = vmci_datagram_create_handle(resource_id, flags,
591                                                   recv_cb, client_data,
592                                                   out_handle);
593 
594         return err;
595 }
596 
597 /* This is invoked as part of a tasklet that's scheduled when the VMCI
598  * interrupt fires.  This is run in bottom-half context and if it ever needs to
599  * sleep it should defer that work to a work queue.
600  */
601 
602 static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg)
603 {
604         struct sock *sk;
605         size_t size;
606         struct sk_buff *skb;
607         struct vsock_sock *vsk;
608 
609         sk = (struct sock *)data;
610 
611         /* This handler is privileged when this module is running on the host.
612          * We will get datagrams from all endpoints (even VMs that are in a
613          * restricted context). If we get one from a restricted context then
614          * the destination socket must be trusted.
615          *
616          * NOTE: We access the socket struct without holding the lock here.
617          * This is ok because the field we are interested is never modified
618          * outside of the create and destruct socket functions.
619          */
620         vsk = vsock_sk(sk);
621         if (!vmci_transport_allow_dgram(vsk, dg->src.context))
622                 return VMCI_ERROR_NO_ACCESS;
623 
624         size = VMCI_DG_SIZE(dg);
625 
626         /* Attach the packet to the socket's receive queue as an sk_buff. */
627         skb = alloc_skb(size, GFP_ATOMIC);
628         if (!skb)
629                 return VMCI_ERROR_NO_MEM;
630 
631         /* sk_receive_skb() will do a sock_put(), so hold here. */
632         sock_hold(sk);
633         skb_put(skb, size);
634         memcpy(skb->data, dg, size);
635         sk_receive_skb(sk, skb, 0);
636 
637         return VMCI_SUCCESS;
638 }
639 
640 static bool vmci_transport_stream_allow(u32 cid, u32 port)
641 {
642         static const u32 non_socket_contexts[] = {
643                 VMADDR_CID_RESERVED,
644         };
645         int i;
646 
647         BUILD_BUG_ON(sizeof(cid) != sizeof(*non_socket_contexts));
648 
649         for (i = 0; i < ARRAY_SIZE(non_socket_contexts); i++) {
650                 if (cid == non_socket_contexts[i])
651                         return false;
652         }
653 
654         return true;
655 }
656 
657 /* This is invoked as part of a tasklet that's scheduled when the VMCI
658  * interrupt fires.  This is run in bottom-half context but it defers most of
659  * its work to the packet handling work queue.
660  */
661 
662 static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg)
663 {
664         struct sock *sk;
665         struct sockaddr_vm dst;
666         struct sockaddr_vm src;
667         struct vmci_transport_packet *pkt;
668         struct vsock_sock *vsk;
669         bool bh_process_pkt;
670         int err;
671 
672         sk = NULL;
673         err = VMCI_SUCCESS;
674         bh_process_pkt = false;
675 
676         /* Ignore incoming packets from contexts without sockets, or resources
677          * that aren't vsock implementations.
678          */
679 
680         if (!vmci_transport_stream_allow(dg->src.context, -1)
681             || vmci_transport_peer_rid(dg->src.context) != dg->src.resource)
682                 return VMCI_ERROR_NO_ACCESS;
683 
684         if (VMCI_DG_SIZE(dg) < sizeof(*pkt))
685                 /* Drop datagrams that do not contain full VSock packets. */
686                 return VMCI_ERROR_INVALID_ARGS;
687 
688         pkt = (struct vmci_transport_packet *)dg;
689 
690         /* Find the socket that should handle this packet.  First we look for a
691          * connected socket and if there is none we look for a socket bound to
692          * the destintation address.
693          */
694         vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port);
695         vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port);
696 
697         sk = vsock_find_connected_socket(&src, &dst);
698         if (!sk) {
699                 sk = vsock_find_bound_socket(&dst);
700                 if (!sk) {
701                         /* We could not find a socket for this specified
702                          * address.  If this packet is a RST, we just drop it.
703                          * If it is another packet, we send a RST.  Note that
704                          * we do not send a RST reply to RSTs so that we do not
705                          * continually send RSTs between two endpoints.
706                          *
707                          * Note that since this is a reply, dst is src and src
708                          * is dst.
709                          */
710                         if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0)
711                                 pr_err("unable to send reset\n");
712 
713                         err = VMCI_ERROR_NOT_FOUND;
714                         goto out;
715                 }
716         }
717 
718         /* If the received packet type is beyond all types known to this
719          * implementation, reply with an invalid message.  Hopefully this will
720          * help when implementing backwards compatibility in the future.
721          */
722         if (pkt->type >= VMCI_TRANSPORT_PACKET_TYPE_MAX) {
723                 vmci_transport_send_invalid_bh(&dst, &src);
724                 err = VMCI_ERROR_INVALID_ARGS;
725                 goto out;
726         }
727 
728         /* This handler is privileged when this module is running on the host.
729          * We will get datagram connect requests from all endpoints (even VMs
730          * that are in a restricted context). If we get one from a restricted
731          * context then the destination socket must be trusted.
732          *
733          * NOTE: We access the socket struct without holding the lock here.
734          * This is ok because the field we are interested is never modified
735          * outside of the create and destruct socket functions.
736          */
737         vsk = vsock_sk(sk);
738         if (!vmci_transport_allow_dgram(vsk, pkt->dg.src.context)) {
739                 err = VMCI_ERROR_NO_ACCESS;
740                 goto out;
741         }
742 
743         /* We do most everything in a work queue, but let's fast path the
744          * notification of reads and writes to help data transfer performance.
745          * We can only do this if there is no process context code executing
746          * for this socket since that may change the state.
747          */
748         bh_lock_sock(sk);
749 
750         if (!sock_owned_by_user(sk)) {
751                 /* The local context ID may be out of date, update it. */
752                 vsk->local_addr.svm_cid = dst.svm_cid;
753 
754                 if (sk->sk_state == SS_CONNECTED)
755                         vmci_trans(vsk)->notify_ops->handle_notify_pkt(
756                                         sk, pkt, true, &dst, &src,
757                                         &bh_process_pkt);
758         }
759 
760         bh_unlock_sock(sk);
761 
762         if (!bh_process_pkt) {
763                 struct vmci_transport_recv_pkt_info *recv_pkt_info;
764 
765                 recv_pkt_info = kmalloc(sizeof(*recv_pkt_info), GFP_ATOMIC);
766                 if (!recv_pkt_info) {
767                         if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0)
768                                 pr_err("unable to send reset\n");
769 
770                         err = VMCI_ERROR_NO_MEM;
771                         goto out;
772                 }
773 
774                 recv_pkt_info->sk = sk;
775                 memcpy(&recv_pkt_info->pkt, pkt, sizeof(recv_pkt_info->pkt));
776                 INIT_WORK(&recv_pkt_info->work, vmci_transport_recv_pkt_work);
777 
778                 schedule_work(&recv_pkt_info->work);
779                 /* Clear sk so that the reference count incremented by one of
780                  * the Find functions above is not decremented below.  We need
781                  * that reference count for the packet handler we've scheduled
782                  * to run.
783                  */
784                 sk = NULL;
785         }
786 
787 out:
788         if (sk)
789                 sock_put(sk);
790 
791         return err;
792 }
793 
794 static void vmci_transport_peer_attach_cb(u32 sub_id,
795                                           const struct vmci_event_data *e_data,
796                                           void *client_data)
797 {
798         struct sock *sk = client_data;
799         const struct vmci_event_payload_qp *e_payload;
800         struct vsock_sock *vsk;
801 
802         e_payload = vmci_event_data_const_payload(e_data);
803 
804         vsk = vsock_sk(sk);
805 
806         /* We don't ask for delayed CBs when we subscribe to this event (we
807          * pass 0 as flags to vmci_event_subscribe()).  VMCI makes no
808          * guarantees in that case about what context we might be running in,
809          * so it could be BH or process, blockable or non-blockable.  So we
810          * need to account for all possible contexts here.
811          */
812         local_bh_disable();
813         bh_lock_sock(sk);
814 
815         /* XXX This is lame, we should provide a way to lookup sockets by
816          * qp_handle.
817          */
818         if (vmci_handle_is_equal(vmci_trans(vsk)->qp_handle,
819                                  e_payload->handle)) {
820                 /* XXX This doesn't do anything, but in the future we may want
821                  * to set a flag here to verify the attach really did occur and
822                  * we weren't just sent a datagram claiming it was.
823                  */
824                 goto out;
825         }
826 
827 out:
828         bh_unlock_sock(sk);
829         local_bh_enable();
830 }
831 
832 static void vmci_transport_handle_detach(struct sock *sk)
833 {
834         struct vsock_sock *vsk;
835 
836         vsk = vsock_sk(sk);
837         if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) {
838                 sock_set_flag(sk, SOCK_DONE);
839 
840                 /* On a detach the peer will not be sending or receiving
841                  * anymore.
842                  */
843                 vsk->peer_shutdown = SHUTDOWN_MASK;
844 
845                 /* We should not be sending anymore since the peer won't be
846                  * there to receive, but we can still receive if there is data
847                  * left in our consume queue.
848                  */
849                 if (vsock_stream_has_data(vsk) <= 0) {
850                         if (sk->sk_state == SS_CONNECTING) {
851                                 /* The peer may detach from a queue pair while
852                                  * we are still in the connecting state, i.e.,
853                                  * if the peer VM is killed after attaching to
854                                  * a queue pair, but before we complete the
855                                  * handshake. In that case, we treat the detach
856                                  * event like a reset.
857                                  */
858 
859                                 sk->sk_state = SS_UNCONNECTED;
860                                 sk->sk_err = ECONNRESET;
861                                 sk->sk_error_report(sk);
862                                 return;
863                         }
864                         sk->sk_state = SS_UNCONNECTED;
865                 }
866                 sk->sk_state_change(sk);
867         }
868 }
869 
870 static void vmci_transport_peer_detach_cb(u32 sub_id,
871                                           const struct vmci_event_data *e_data,
872                                           void *client_data)
873 {
874         struct sock *sk = client_data;
875         const struct vmci_event_payload_qp *e_payload;
876         struct vsock_sock *vsk;
877 
878         e_payload = vmci_event_data_const_payload(e_data);
879         vsk = vsock_sk(sk);
880         if (vmci_handle_is_invalid(e_payload->handle))
881                 return;
882 
883         /* Same rules for locking as for peer_attach_cb(). */
884         local_bh_disable();
885         bh_lock_sock(sk);
886 
887         /* XXX This is lame, we should provide a way to lookup sockets by
888          * qp_handle.
889          */
890         if (vmci_handle_is_equal(vmci_trans(vsk)->qp_handle,
891                                  e_payload->handle))
892                 vmci_transport_handle_detach(sk);
893 
894         bh_unlock_sock(sk);
895         local_bh_enable();
896 }
897 
898 static void vmci_transport_qp_resumed_cb(u32 sub_id,
899                                          const struct vmci_event_data *e_data,
900                                          void *client_data)
901 {
902         vsock_for_each_connected_socket(vmci_transport_handle_detach);
903 }
904 
905 static void vmci_transport_recv_pkt_work(struct work_struct *work)
906 {
907         struct vmci_transport_recv_pkt_info *recv_pkt_info;
908         struct vmci_transport_packet *pkt;
909         struct sock *sk;
910 
911         recv_pkt_info =
912                 container_of(work, struct vmci_transport_recv_pkt_info, work);
913         sk = recv_pkt_info->sk;
914         pkt = &recv_pkt_info->pkt;
915 
916         lock_sock(sk);
917 
918         /* The local context ID may be out of date. */
919         vsock_sk(sk)->local_addr.svm_cid = pkt->dg.dst.context;
920 
921         switch (sk->sk_state) {
922         case SS_LISTEN:
923                 vmci_transport_recv_listen(sk, pkt);
924                 break;
925         case SS_CONNECTING:
926                 /* Processing of pending connections for servers goes through
927                  * the listening socket, so see vmci_transport_recv_listen()
928                  * for that path.
929                  */
930                 vmci_transport_recv_connecting_client(sk, pkt);
931                 break;
932         case SS_CONNECTED:
933                 vmci_transport_recv_connected(sk, pkt);
934                 break;
935         default:
936                 /* Because this function does not run in the same context as
937                  * vmci_transport_recv_stream_cb it is possible that the
938                  * socket has closed. We need to let the other side know or it
939                  * could be sitting in a connect and hang forever. Send a
940                  * reset to prevent that.
941                  */
942                 vmci_transport_send_reset(sk, pkt);
943                 break;
944         }
945 
946         release_sock(sk);
947         kfree(recv_pkt_info);
948         /* Release reference obtained in the stream callback when we fetched
949          * this socket out of the bound or connected list.
950          */
951         sock_put(sk);
952 }
953 
954 static int vmci_transport_recv_listen(struct sock *sk,
955                                       struct vmci_transport_packet *pkt)
956 {
957         struct sock *pending;
958         struct vsock_sock *vpending;
959         int err;
960         u64 qp_size;
961         bool old_request = false;
962         bool old_pkt_proto = false;
963 
964         err = 0;
965 
966         /* Because we are in the listen state, we could be receiving a packet
967          * for ourself or any previous connection requests that we received.
968          * If it's the latter, we try to find a socket in our list of pending
969          * connections and, if we do, call the appropriate handler for the
970          * state that that socket is in.  Otherwise we try to service the
971          * connection request.
972          */
973         pending = vmci_transport_get_pending(sk, pkt);
974         if (pending) {
975                 lock_sock(pending);
976 
977                 /* The local context ID may be out of date. */
978                 vsock_sk(pending)->local_addr.svm_cid = pkt->dg.dst.context;
979 
980                 switch (pending->sk_state) {
981                 case SS_CONNECTING:
982                         err = vmci_transport_recv_connecting_server(sk,
983                                                                     pending,
984                                                                     pkt);
985                         break;
986                 default:
987                         vmci_transport_send_reset(pending, pkt);
988                         err = -EINVAL;
989                 }
990 
991                 if (err < 0)
992                         vsock_remove_pending(sk, pending);
993 
994                 release_sock(pending);
995                 vmci_transport_release_pending(pending);
996 
997                 return err;
998         }
999 
1000         /* The listen state only accepts connection requests.  Reply with a
1001          * reset unless we received a reset.
1002          */
1003 
1004         if (!(pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST ||
1005               pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)) {
1006                 vmci_transport_reply_reset(pkt);
1007                 return -EINVAL;
1008         }
1009 
1010         if (pkt->u.size == 0) {
1011                 vmci_transport_reply_reset(pkt);
1012                 return -EINVAL;
1013         }
1014 
1015         /* If this socket can't accommodate this connection request, we send a
1016          * reset.  Otherwise we create and initialize a child socket and reply
1017          * with a connection negotiation.
1018          */
1019         if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) {
1020                 vmci_transport_reply_reset(pkt);
1021                 return -ECONNREFUSED;
1022         }
1023 
1024         pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
1025                                  sk->sk_type, 0);
1026         if (!pending) {
1027                 vmci_transport_send_reset(sk, pkt);
1028                 return -ENOMEM;
1029         }
1030 
1031         vpending = vsock_sk(pending);
1032 
1033         vsock_addr_init(&vpending->local_addr, pkt->dg.dst.context,
1034                         pkt->dst_port);
1035         vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context,
1036                         pkt->src_port);
1037 
1038         /* If the proposed size fits within our min/max, accept it. Otherwise
1039          * propose our own size.
1040          */
1041         if (pkt->u.size >= vmci_trans(vpending)->queue_pair_min_size &&
1042             pkt->u.size <= vmci_trans(vpending)->queue_pair_max_size) {
1043                 qp_size = pkt->u.size;
1044         } else {
1045                 qp_size = vmci_trans(vpending)->queue_pair_size;
1046         }
1047 
1048         /* Figure out if we are using old or new requests based on the
1049          * overrides pkt types sent by our peer.
1050          */
1051         if (vmci_transport_old_proto_override(&old_pkt_proto)) {
1052                 old_request = old_pkt_proto;
1053         } else {
1054                 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST)
1055                         old_request = true;
1056                 else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)
1057                         old_request = false;
1058 
1059         }
1060 
1061         if (old_request) {
1062                 /* Handle a REQUEST (or override) */
1063                 u16 version = VSOCK_PROTO_INVALID;
1064                 if (vmci_transport_proto_to_notify_struct(
1065                         pending, &version, true))
1066                         err = vmci_transport_send_negotiate(pending, qp_size);
1067                 else
1068                         err = -EINVAL;
1069 
1070         } else {
1071                 /* Handle a REQUEST2 (or override) */
1072                 int proto_int = pkt->proto;
1073                 int pos;
1074                 u16 active_proto_version = 0;
1075 
1076                 /* The list of possible protocols is the intersection of all
1077                  * protocols the client supports ... plus all the protocols we
1078                  * support.
1079                  */
1080                 proto_int &= vmci_transport_new_proto_supported_versions();
1081 
1082                 /* We choose the highest possible protocol version and use that
1083                  * one.
1084                  */
1085                 pos = fls(proto_int);
1086                 if (pos) {
1087                         active_proto_version = (1 << (pos - 1));
1088                         if (vmci_transport_proto_to_notify_struct(
1089                                 pending, &active_proto_version, false))
1090                                 err = vmci_transport_send_negotiate2(pending,
1091                                                         qp_size,
1092                                                         active_proto_version);
1093                         else
1094                                 err = -EINVAL;
1095 
1096                 } else {
1097                         err = -EINVAL;
1098                 }
1099         }
1100 
1101         if (err < 0) {
1102                 vmci_transport_send_reset(sk, pkt);
1103                 sock_put(pending);
1104                 err = vmci_transport_error_to_vsock_error(err);
1105                 goto out;
1106         }
1107 
1108         vsock_add_pending(sk, pending);
1109         sk->sk_ack_backlog++;
1110 
1111         pending->sk_state = SS_CONNECTING;
1112         vmci_trans(vpending)->produce_size =
1113                 vmci_trans(vpending)->consume_size = qp_size;
1114         vmci_trans(vpending)->queue_pair_size = qp_size;
1115 
1116         vmci_trans(vpending)->notify_ops->process_request(pending);
1117 
1118         /* We might never receive another message for this socket and it's not
1119          * connected to any process, so we have to ensure it gets cleaned up
1120          * ourself.  Our delayed work function will take care of that.  Note
1121          * that we do not ever cancel this function since we have few
1122          * guarantees about its state when calling cancel_delayed_work().
1123          * Instead we hold a reference on the socket for that function and make
1124          * it capable of handling cases where it needs to do nothing but
1125          * release that reference.
1126          */
1127         vpending->listener = sk;
1128         sock_hold(sk);
1129         sock_hold(pending);
1130         INIT_DELAYED_WORK(&vpending->dwork, vsock_pending_work);
1131         schedule_delayed_work(&vpending->dwork, HZ);
1132 
1133 out:
1134         return err;
1135 }
1136 
1137 static int
1138 vmci_transport_recv_connecting_server(struct sock *listener,
1139                                       struct sock *pending,
1140                                       struct vmci_transport_packet *pkt)
1141 {
1142         struct vsock_sock *vpending;
1143         struct vmci_handle handle;
1144         struct vmci_qp *qpair;
1145         bool is_local;
1146         u32 flags;
1147         u32 detach_sub_id;
1148         int err;
1149         int skerr;
1150 
1151         vpending = vsock_sk(pending);
1152         detach_sub_id = VMCI_INVALID_ID;
1153 
1154         switch (pkt->type) {
1155         case VMCI_TRANSPORT_PACKET_TYPE_OFFER:
1156                 if (vmci_handle_is_invalid(pkt->u.handle)) {
1157                         vmci_transport_send_reset(pending, pkt);
1158                         skerr = EPROTO;
1159                         err = -EINVAL;
1160                         goto destroy;
1161                 }
1162                 break;
1163         default:
1164                 /* Close and cleanup the connection. */
1165                 vmci_transport_send_reset(pending, pkt);
1166                 skerr = EPROTO;
1167                 err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL;
1168                 goto destroy;
1169         }
1170 
1171         /* In order to complete the connection we need to attach to the offered
1172          * queue pair and send an attach notification.  We also subscribe to the
1173          * detach event so we know when our peer goes away, and we do that
1174          * before attaching so we don't miss an event.  If all this succeeds,
1175          * we update our state and wakeup anything waiting in accept() for a
1176          * connection.
1177          */
1178 
1179         /* We don't care about attach since we ensure the other side has
1180          * attached by specifying the ATTACH_ONLY flag below.
1181          */
1182         err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH,
1183                                    vmci_transport_peer_detach_cb,
1184                                    pending, &detach_sub_id);
1185         if (err < VMCI_SUCCESS) {
1186                 vmci_transport_send_reset(pending, pkt);
1187                 err = vmci_transport_error_to_vsock_error(err);
1188                 skerr = -err;
1189                 goto destroy;
1190         }
1191 
1192         vmci_trans(vpending)->detach_sub_id = detach_sub_id;
1193 
1194         /* Now attach to the queue pair the client created. */
1195         handle = pkt->u.handle;
1196 
1197         /* vpending->local_addr always has a context id so we do not need to
1198          * worry about VMADDR_CID_ANY in this case.
1199          */
1200         is_local =
1201             vpending->remote_addr.svm_cid == vpending->local_addr.svm_cid;
1202         flags = VMCI_QPFLAG_ATTACH_ONLY;
1203         flags |= is_local ? VMCI_QPFLAG_LOCAL : 0;
1204 
1205         err = vmci_transport_queue_pair_alloc(
1206                                         &qpair,
1207                                         &handle,
1208                                         vmci_trans(vpending)->produce_size,
1209                                         vmci_trans(vpending)->consume_size,
1210                                         pkt->dg.src.context,
1211                                         flags,
1212                                         vmci_transport_is_trusted(
1213                                                 vpending,
1214                                                 vpending->remote_addr.svm_cid));
1215         if (err < 0) {
1216                 vmci_transport_send_reset(pending, pkt);
1217                 skerr = -err;
1218                 goto destroy;
1219         }
1220 
1221         vmci_trans(vpending)->qp_handle = handle;
1222         vmci_trans(vpending)->qpair = qpair;
1223 
1224         /* When we send the attach message, we must be ready to handle incoming
1225          * control messages on the newly connected socket. So we move the
1226          * pending socket to the connected state before sending the attach
1227          * message. Otherwise, an incoming packet triggered by the attach being
1228          * received by the peer may be processed concurrently with what happens
1229          * below after sending the attach message, and that incoming packet
1230          * will find the listening socket instead of the (currently) pending
1231          * socket. Note that enqueueing the socket increments the reference
1232          * count, so even if a reset comes before the connection is accepted,
1233          * the socket will be valid until it is removed from the queue.
1234          *
1235          * If we fail sending the attach below, we remove the socket from the
1236          * connected list and move the socket to SS_UNCONNECTED before
1237          * releasing the lock, so a pending slow path processing of an incoming
1238          * packet will not see the socket in the connected state in that case.
1239          */
1240         pending->sk_state = SS_CONNECTED;
1241 
1242         vsock_insert_connected(vpending);
1243 
1244         /* Notify our peer of our attach. */
1245         err = vmci_transport_send_attach(pending, handle);
1246         if (err < 0) {
1247                 vsock_remove_connected(vpending);
1248                 pr_err("Could not send attach\n");
1249                 vmci_transport_send_reset(pending, pkt);
1250                 err = vmci_transport_error_to_vsock_error(err);
1251                 skerr = -err;
1252                 goto destroy;
1253         }
1254 
1255         /* We have a connection. Move the now connected socket from the
1256          * listener's pending list to the accept queue so callers of accept()
1257          * can find it.
1258          */
1259         vsock_remove_pending(listener, pending);
1260         vsock_enqueue_accept(listener, pending);
1261 
1262         /* Callers of accept() will be be waiting on the listening socket, not
1263          * the pending socket.
1264          */
1265         listener->sk_state_change(listener);
1266 
1267         return 0;
1268 
1269 destroy:
1270         pending->sk_err = skerr;
1271         pending->sk_state = SS_UNCONNECTED;
1272         /* As long as we drop our reference, all necessary cleanup will handle
1273          * when the cleanup function drops its reference and our destruct
1274          * implementation is called.  Note that since the listen handler will
1275          * remove pending from the pending list upon our failure, the cleanup
1276          * function won't drop the additional reference, which is why we do it
1277          * here.
1278          */
1279         sock_put(pending);
1280 
1281         return err;
1282 }
1283 
1284 static int
1285 vmci_transport_recv_connecting_client(struct sock *sk,
1286                                       struct vmci_transport_packet *pkt)
1287 {
1288         struct vsock_sock *vsk;
1289         int err;
1290         int skerr;
1291 
1292         vsk = vsock_sk(sk);
1293 
1294         switch (pkt->type) {
1295         case VMCI_TRANSPORT_PACKET_TYPE_ATTACH:
1296                 if (vmci_handle_is_invalid(pkt->u.handle) ||
1297                     !vmci_handle_is_equal(pkt->u.handle,
1298                                           vmci_trans(vsk)->qp_handle)) {
1299                         skerr = EPROTO;
1300                         err = -EINVAL;
1301                         goto destroy;
1302                 }
1303 
1304                 /* Signify the socket is connected and wakeup the waiter in
1305                  * connect(). Also place the socket in the connected table for
1306                  * accounting (it can already be found since it's in the bound
1307                  * table).
1308                  */
1309                 sk->sk_state = SS_CONNECTED;
1310                 sk->sk_socket->state = SS_CONNECTED;
1311                 vsock_insert_connected(vsk);
1312                 sk->sk_state_change(sk);
1313 
1314                 break;
1315         case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE:
1316         case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2:
1317                 if (pkt->u.size == 0
1318                     || pkt->dg.src.context != vsk->remote_addr.svm_cid
1319                     || pkt->src_port != vsk->remote_addr.svm_port
1320                     || !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)
1321                     || vmci_trans(vsk)->qpair
1322                     || vmci_trans(vsk)->produce_size != 0
1323                     || vmci_trans(vsk)->consume_size != 0
1324                     || vmci_trans(vsk)->attach_sub_id != VMCI_INVALID_ID
1325                     || vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) {
1326                         skerr = EPROTO;
1327                         err = -EINVAL;
1328 
1329                         goto destroy;
1330                 }
1331 
1332                 err = vmci_transport_recv_connecting_client_negotiate(sk, pkt);
1333                 if (err) {
1334                         skerr = -err;
1335                         goto destroy;
1336                 }
1337 
1338                 break;
1339         case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
1340                 err = vmci_transport_recv_connecting_client_invalid(sk, pkt);
1341                 if (err) {
1342                         skerr = -err;
1343                         goto destroy;
1344                 }
1345 
1346                 break;
1347         case VMCI_TRANSPORT_PACKET_TYPE_RST:
1348                 /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to
1349                  * continue processing here after they sent an INVALID packet.
1350                  * This meant that we got a RST after the INVALID. We ignore a
1351                  * RST after an INVALID. The common code doesn't send the RST
1352                  * ... so we can hang if an old version of the common code
1353                  * fails between getting a REQUEST and sending an OFFER back.
1354                  * Not much we can do about it... except hope that it doesn't
1355                  * happen.
1356                  */
1357                 if (vsk->ignore_connecting_rst) {
1358                         vsk->ignore_connecting_rst = false;
1359                 } else {
1360                         skerr = ECONNRESET;
1361                         err = 0;
1362                         goto destroy;
1363                 }
1364 
1365                 break;
1366         default:
1367                 /* Close and cleanup the connection. */
1368                 skerr = EPROTO;
1369                 err = -EINVAL;
1370                 goto destroy;
1371         }
1372 
1373         return 0;
1374 
1375 destroy:
1376         vmci_transport_send_reset(sk, pkt);
1377 
1378         sk->sk_state = SS_UNCONNECTED;
1379         sk->sk_err = skerr;
1380         sk->sk_error_report(sk);
1381         return err;
1382 }
1383 
1384 static int vmci_transport_recv_connecting_client_negotiate(
1385                                         struct sock *sk,
1386                                         struct vmci_transport_packet *pkt)
1387 {
1388         int err;
1389         struct vsock_sock *vsk;
1390         struct vmci_handle handle;
1391         struct vmci_qp *qpair;
1392         u32 attach_sub_id;
1393         u32 detach_sub_id;
1394         bool is_local;
1395         u32 flags;
1396         bool old_proto = true;
1397         bool old_pkt_proto;
1398         u16 version;
1399 
1400         vsk = vsock_sk(sk);
1401         handle = VMCI_INVALID_HANDLE;
1402         attach_sub_id = VMCI_INVALID_ID;
1403         detach_sub_id = VMCI_INVALID_ID;
1404 
1405         /* If we have gotten here then we should be past the point where old
1406          * linux vsock could have sent the bogus rst.
1407          */
1408         vsk->sent_request = false;
1409         vsk->ignore_connecting_rst = false;
1410 
1411         /* Verify that we're OK with the proposed queue pair size */
1412         if (pkt->u.size < vmci_trans(vsk)->queue_pair_min_size ||
1413             pkt->u.size > vmci_trans(vsk)->queue_pair_max_size) {
1414                 err = -EINVAL;
1415                 goto destroy;
1416         }
1417 
1418         /* At this point we know the CID the peer is using to talk to us. */
1419 
1420         if (vsk->local_addr.svm_cid == VMADDR_CID_ANY)
1421                 vsk->local_addr.svm_cid = pkt->dg.dst.context;
1422 
1423         /* Setup the notify ops to be the highest supported version that both
1424          * the server and the client support.
1425          */
1426 
1427         if (vmci_transport_old_proto_override(&old_pkt_proto)) {
1428                 old_proto = old_pkt_proto;
1429         } else {
1430                 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE)
1431                         old_proto = true;
1432                 else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2)
1433                         old_proto = false;
1434 
1435         }
1436 
1437         if (old_proto)
1438                 version = VSOCK_PROTO_INVALID;
1439         else
1440                 version = pkt->proto;
1441 
1442         if (!vmci_transport_proto_to_notify_struct(sk, &version, old_proto)) {
1443                 err = -EINVAL;
1444                 goto destroy;
1445         }
1446 
1447         /* Subscribe to attach and detach events first.
1448          *
1449          * XXX We attach once for each queue pair created for now so it is easy
1450          * to find the socket (it's provided), but later we should only
1451          * subscribe once and add a way to lookup sockets by queue pair handle.
1452          */
1453         err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_ATTACH,
1454                                    vmci_transport_peer_attach_cb,
1455                                    sk, &attach_sub_id);
1456         if (err < VMCI_SUCCESS) {
1457                 err = vmci_transport_error_to_vsock_error(err);
1458                 goto destroy;
1459         }
1460 
1461         err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH,
1462                                    vmci_transport_peer_detach_cb,
1463                                    sk, &detach_sub_id);
1464         if (err < VMCI_SUCCESS) {
1465                 err = vmci_transport_error_to_vsock_error(err);
1466                 goto destroy;
1467         }
1468 
1469         /* Make VMCI select the handle for us. */
1470         handle = VMCI_INVALID_HANDLE;
1471         is_local = vsk->remote_addr.svm_cid == vsk->local_addr.svm_cid;
1472         flags = is_local ? VMCI_QPFLAG_LOCAL : 0;
1473 
1474         err = vmci_transport_queue_pair_alloc(&qpair,
1475                                               &handle,
1476                                               pkt->u.size,
1477                                               pkt->u.size,
1478                                               vsk->remote_addr.svm_cid,
1479                                               flags,
1480                                               vmci_transport_is_trusted(
1481                                                   vsk,
1482                                                   vsk->
1483                                                   remote_addr.svm_cid));
1484         if (err < 0)
1485                 goto destroy;
1486 
1487         err = vmci_transport_send_qp_offer(sk, handle);
1488         if (err < 0) {
1489                 err = vmci_transport_error_to_vsock_error(err);
1490                 goto destroy;
1491         }
1492 
1493         vmci_trans(vsk)->qp_handle = handle;
1494         vmci_trans(vsk)->qpair = qpair;
1495 
1496         vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size =
1497                 pkt->u.size;
1498 
1499         vmci_trans(vsk)->attach_sub_id = attach_sub_id;
1500         vmci_trans(vsk)->detach_sub_id = detach_sub_id;
1501 
1502         vmci_trans(vsk)->notify_ops->process_negotiate(sk);
1503 
1504         return 0;
1505 
1506 destroy:
1507         if (attach_sub_id != VMCI_INVALID_ID)
1508                 vmci_event_unsubscribe(attach_sub_id);
1509 
1510         if (detach_sub_id != VMCI_INVALID_ID)
1511                 vmci_event_unsubscribe(detach_sub_id);
1512 
1513         if (!vmci_handle_is_invalid(handle))
1514                 vmci_qpair_detach(&qpair);
1515 
1516         return err;
1517 }
1518 
1519 static int
1520 vmci_transport_recv_connecting_client_invalid(struct sock *sk,
1521                                               struct vmci_transport_packet *pkt)
1522 {
1523         int err = 0;
1524         struct vsock_sock *vsk = vsock_sk(sk);
1525 
1526         if (vsk->sent_request) {
1527                 vsk->sent_request = false;
1528                 vsk->ignore_connecting_rst = true;
1529 
1530                 err = vmci_transport_send_conn_request(
1531                         sk, vmci_trans(vsk)->queue_pair_size);
1532                 if (err < 0)
1533                         err = vmci_transport_error_to_vsock_error(err);
1534                 else
1535                         err = 0;
1536 
1537         }
1538 
1539         return err;
1540 }
1541 
1542 static int vmci_transport_recv_connected(struct sock *sk,
1543                                          struct vmci_transport_packet *pkt)
1544 {
1545         struct vsock_sock *vsk;
1546         bool pkt_processed = false;
1547 
1548         /* In cases where we are closing the connection, it's sufficient to
1549          * mark the state change (and maybe error) and wake up any waiting
1550          * threads. Since this is a connected socket, it's owned by a user
1551          * process and will be cleaned up when the failure is passed back on
1552          * the current or next system call.  Our system call implementations
1553          * must therefore check for error and state changes on entry and when
1554          * being awoken.
1555          */
1556         switch (pkt->type) {
1557         case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN:
1558                 if (pkt->u.mode) {
1559                         vsk = vsock_sk(sk);
1560 
1561                         vsk->peer_shutdown |= pkt->u.mode;
1562                         sk->sk_state_change(sk);
1563                 }
1564                 break;
1565 
1566         case VMCI_TRANSPORT_PACKET_TYPE_RST:
1567                 vsk = vsock_sk(sk);
1568                 /* It is possible that we sent our peer a message (e.g a
1569                  * WAITING_READ) right before we got notified that the peer had
1570                  * detached. If that happens then we can get a RST pkt back
1571                  * from our peer even though there is data available for us to
1572                  * read. In that case, don't shutdown the socket completely but
1573                  * instead allow the local client to finish reading data off
1574                  * the queuepair. Always treat a RST pkt in connected mode like
1575                  * a clean shutdown.
1576                  */
1577                 sock_set_flag(sk, SOCK_DONE);
1578                 vsk->peer_shutdown = SHUTDOWN_MASK;
1579                 if (vsock_stream_has_data(vsk) <= 0)
1580                         sk->sk_state = SS_DISCONNECTING;
1581 
1582                 sk->sk_state_change(sk);
1583                 break;
1584 
1585         default:
1586                 vsk = vsock_sk(sk);
1587                 vmci_trans(vsk)->notify_ops->handle_notify_pkt(
1588                                 sk, pkt, false, NULL, NULL,
1589                                 &pkt_processed);
1590                 if (!pkt_processed)
1591                         return -EINVAL;
1592 
1593                 break;
1594         }
1595 
1596         return 0;
1597 }
1598 
1599 static int vmci_transport_socket_init(struct vsock_sock *vsk,
1600                                       struct vsock_sock *psk)
1601 {
1602         vsk->trans = kmalloc(sizeof(struct vmci_transport), GFP_KERNEL);
1603         if (!vsk->trans)
1604                 return -ENOMEM;
1605 
1606         vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE;
1607         vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE;
1608         vmci_trans(vsk)->qpair = NULL;
1609         vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 0;
1610         vmci_trans(vsk)->attach_sub_id = vmci_trans(vsk)->detach_sub_id =
1611                 VMCI_INVALID_ID;
1612         vmci_trans(vsk)->notify_ops = NULL;
1613         if (psk) {
1614                 vmci_trans(vsk)->queue_pair_size =
1615                         vmci_trans(psk)->queue_pair_size;
1616                 vmci_trans(vsk)->queue_pair_min_size =
1617                         vmci_trans(psk)->queue_pair_min_size;
1618                 vmci_trans(vsk)->queue_pair_max_size =
1619                         vmci_trans(psk)->queue_pair_max_size;
1620         } else {
1621                 vmci_trans(vsk)->queue_pair_size =
1622                         VMCI_TRANSPORT_DEFAULT_QP_SIZE;
1623                 vmci_trans(vsk)->queue_pair_min_size =
1624                          VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN;
1625                 vmci_trans(vsk)->queue_pair_max_size =
1626                         VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX;
1627         }
1628 
1629         return 0;
1630 }
1631 
1632 static void vmci_transport_destruct(struct vsock_sock *vsk)
1633 {
1634         if (vmci_trans(vsk)->attach_sub_id != VMCI_INVALID_ID) {
1635                 vmci_event_unsubscribe(vmci_trans(vsk)->attach_sub_id);
1636                 vmci_trans(vsk)->attach_sub_id = VMCI_INVALID_ID;
1637         }
1638 
1639         if (vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) {
1640                 vmci_event_unsubscribe(vmci_trans(vsk)->detach_sub_id);
1641                 vmci_trans(vsk)->detach_sub_id = VMCI_INVALID_ID;
1642         }
1643 
1644         if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) {
1645                 vmci_qpair_detach(&vmci_trans(vsk)->qpair);
1646                 vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE;
1647                 vmci_trans(vsk)->produce_size = 0;
1648                 vmci_trans(vsk)->consume_size = 0;
1649         }
1650 
1651         if (vmci_trans(vsk)->notify_ops)
1652                 vmci_trans(vsk)->notify_ops->socket_destruct(vsk);
1653 
1654         kfree(vsk->trans);
1655         vsk->trans = NULL;
1656 }
1657 
1658 static void vmci_transport_release(struct vsock_sock *vsk)
1659 {
1660         if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) {
1661                 vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle);
1662                 vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE;
1663         }
1664 }
1665 
1666 static int vmci_transport_dgram_bind(struct vsock_sock *vsk,
1667                                      struct sockaddr_vm *addr)
1668 {
1669         u32 port;
1670         u32 flags;
1671         int err;
1672 
1673         /* VMCI will select a resource ID for us if we provide
1674          * VMCI_INVALID_ID.
1675          */
1676         port = addr->svm_port == VMADDR_PORT_ANY ?
1677                         VMCI_INVALID_ID : addr->svm_port;
1678 
1679         if (port <= LAST_RESERVED_PORT && !capable(CAP_NET_BIND_SERVICE))
1680                 return -EACCES;
1681 
1682         flags = addr->svm_cid == VMADDR_CID_ANY ?
1683                                 VMCI_FLAG_ANYCID_DG_HND : 0;
1684 
1685         err = vmci_transport_datagram_create_hnd(port, flags,
1686                                                  vmci_transport_recv_dgram_cb,
1687                                                  &vsk->sk,
1688                                                  &vmci_trans(vsk)->dg_handle);
1689         if (err < VMCI_SUCCESS)
1690                 return vmci_transport_error_to_vsock_error(err);
1691         vsock_addr_init(&vsk->local_addr, addr->svm_cid,
1692                         vmci_trans(vsk)->dg_handle.resource);
1693 
1694         return 0;
1695 }
1696 
1697 static int vmci_transport_dgram_enqueue(
1698         struct vsock_sock *vsk,
1699         struct sockaddr_vm *remote_addr,
1700         struct msghdr *msg,
1701         size_t len)
1702 {
1703         int err;
1704         struct vmci_datagram *dg;
1705 
1706         if (len > VMCI_MAX_DG_PAYLOAD_SIZE)
1707                 return -EMSGSIZE;
1708 
1709         if (!vmci_transport_allow_dgram(vsk, remote_addr->svm_cid))
1710                 return -EPERM;
1711 
1712         /* Allocate a buffer for the user's message and our packet header. */
1713         dg = kmalloc(len + sizeof(*dg), GFP_KERNEL);
1714         if (!dg)
1715                 return -ENOMEM;
1716 
1717         memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len);
1718 
1719         dg->dst = vmci_make_handle(remote_addr->svm_cid,
1720                                    remote_addr->svm_port);
1721         dg->src = vmci_make_handle(vsk->local_addr.svm_cid,
1722                                    vsk->local_addr.svm_port);
1723         dg->payload_size = len;
1724 
1725         err = vmci_datagram_send(dg);
1726         kfree(dg);
1727         if (err < 0)
1728                 return vmci_transport_error_to_vsock_error(err);
1729 
1730         return err - sizeof(*dg);
1731 }
1732 
1733 static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk,
1734                                         struct msghdr *msg, size_t len,
1735                                         int flags)
1736 {
1737         int err;
1738         int noblock;
1739         struct vmci_datagram *dg;
1740         size_t payload_len;
1741         struct sk_buff *skb;
1742 
1743         noblock = flags & MSG_DONTWAIT;
1744 
1745         if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
1746                 return -EOPNOTSUPP;
1747 
1748         /* Retrieve the head sk_buff from the socket's receive queue. */
1749         err = 0;
1750         skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err);
1751         if (err)
1752                 return err;
1753 
1754         if (!skb)
1755                 return -EAGAIN;
1756 
1757         dg = (struct vmci_datagram *)skb->data;
1758         if (!dg)
1759                 /* err is 0, meaning we read zero bytes. */
1760                 goto out;
1761 
1762         payload_len = dg->payload_size;
1763         /* Ensure the sk_buff matches the payload size claimed in the packet. */
1764         if (payload_len != skb->len - sizeof(*dg)) {
1765                 err = -EINVAL;
1766                 goto out;
1767         }
1768 
1769         if (payload_len > len) {
1770                 payload_len = len;
1771                 msg->msg_flags |= MSG_TRUNC;
1772         }
1773 
1774         /* Place the datagram payload in the user's iovec. */
1775         err = skb_copy_datagram_msg(skb, sizeof(*dg), msg, payload_len);
1776         if (err)
1777                 goto out;
1778 
1779         if (msg->msg_name) {
1780                 /* Provide the address of the sender. */
1781                 DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name);
1782                 vsock_addr_init(vm_addr, dg->src.context, dg->src.resource);
1783                 msg->msg_namelen = sizeof(*vm_addr);
1784         }
1785         err = payload_len;
1786 
1787 out:
1788         skb_free_datagram(&vsk->sk, skb);
1789         return err;
1790 }
1791 
1792 static bool vmci_transport_dgram_allow(u32 cid, u32 port)
1793 {
1794         if (cid == VMADDR_CID_HYPERVISOR) {
1795                 /* Registrations of PBRPC Servers do not modify VMX/Hypervisor
1796                  * state and are allowed.
1797                  */
1798                 return port == VMCI_UNITY_PBRPC_REGISTER;
1799         }
1800 
1801         return true;
1802 }
1803 
1804 static int vmci_transport_connect(struct vsock_sock *vsk)
1805 {
1806         int err;
1807         bool old_pkt_proto = false;
1808         struct sock *sk = &vsk->sk;
1809 
1810         if (vmci_transport_old_proto_override(&old_pkt_proto) &&
1811                 old_pkt_proto) {
1812                 err = vmci_transport_send_conn_request(
1813                         sk, vmci_trans(vsk)->queue_pair_size);
1814                 if (err < 0) {
1815                         sk->sk_state = SS_UNCONNECTED;
1816                         return err;
1817                 }
1818         } else {
1819                 int supported_proto_versions =
1820                         vmci_transport_new_proto_supported_versions();
1821                 err = vmci_transport_send_conn_request2(
1822                                 sk, vmci_trans(vsk)->queue_pair_size,
1823                                 supported_proto_versions);
1824                 if (err < 0) {
1825                         sk->sk_state = SS_UNCONNECTED;
1826                         return err;
1827                 }
1828 
1829                 vsk->sent_request = true;
1830         }
1831 
1832         return err;
1833 }
1834 
1835 static ssize_t vmci_transport_stream_dequeue(
1836         struct vsock_sock *vsk,
1837         struct msghdr *msg,
1838         size_t len,
1839         int flags)
1840 {
1841         if (flags & MSG_PEEK)
1842                 return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
1843         else
1844                 return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
1845 }
1846 
1847 static ssize_t vmci_transport_stream_enqueue(
1848         struct vsock_sock *vsk,
1849         struct msghdr *msg,
1850         size_t len)
1851 {
1852         return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
1853 }
1854 
1855 static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk)
1856 {
1857         return vmci_qpair_consume_buf_ready(vmci_trans(vsk)->qpair);
1858 }
1859 
1860 static s64 vmci_transport_stream_has_space(struct vsock_sock *vsk)
1861 {
1862         return vmci_qpair_produce_free_space(vmci_trans(vsk)->qpair);
1863 }
1864 
1865 static u64 vmci_transport_stream_rcvhiwat(struct vsock_sock *vsk)
1866 {
1867         return vmci_trans(vsk)->consume_size;
1868 }
1869 
1870 static bool vmci_transport_stream_is_active(struct vsock_sock *vsk)
1871 {
1872         return !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle);
1873 }
1874 
1875 static u64 vmci_transport_get_buffer_size(struct vsock_sock *vsk)
1876 {
1877         return vmci_trans(vsk)->queue_pair_size;
1878 }
1879 
1880 static u64 vmci_transport_get_min_buffer_size(struct vsock_sock *vsk)
1881 {
1882         return vmci_trans(vsk)->queue_pair_min_size;
1883 }
1884 
1885 static u64 vmci_transport_get_max_buffer_size(struct vsock_sock *vsk)
1886 {
1887         return vmci_trans(vsk)->queue_pair_max_size;
1888 }
1889 
1890 static void vmci_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
1891 {
1892         if (val < vmci_trans(vsk)->queue_pair_min_size)
1893                 vmci_trans(vsk)->queue_pair_min_size = val;
1894         if (val > vmci_trans(vsk)->queue_pair_max_size)
1895                 vmci_trans(vsk)->queue_pair_max_size = val;
1896         vmci_trans(vsk)->queue_pair_size = val;
1897 }
1898 
1899 static void vmci_transport_set_min_buffer_size(struct vsock_sock *vsk,
1900                                                u64 val)
1901 {
1902         if (val > vmci_trans(vsk)->queue_pair_size)
1903                 vmci_trans(vsk)->queue_pair_size = val;
1904         vmci_trans(vsk)->queue_pair_min_size = val;
1905 }
1906 
1907 static void vmci_transport_set_max_buffer_size(struct vsock_sock *vsk,
1908                                                u64 val)
1909 {
1910         if (val < vmci_trans(vsk)->queue_pair_size)
1911                 vmci_trans(vsk)->queue_pair_size = val;
1912         vmci_trans(vsk)->queue_pair_max_size = val;
1913 }
1914 
1915 static int vmci_transport_notify_poll_in(
1916         struct vsock_sock *vsk,
1917         size_t target,
1918         bool *data_ready_now)
1919 {
1920         return vmci_trans(vsk)->notify_ops->poll_in(
1921                         &vsk->sk, target, data_ready_now);
1922 }
1923 
1924 static int vmci_transport_notify_poll_out(
1925         struct vsock_sock *vsk,
1926         size_t target,
1927         bool *space_available_now)
1928 {
1929         return vmci_trans(vsk)->notify_ops->poll_out(
1930                         &vsk->sk, target, space_available_now);
1931 }
1932 
1933 static int vmci_transport_notify_recv_init(
1934         struct vsock_sock *vsk,
1935         size_t target,
1936         struct vsock_transport_recv_notify_data *data)
1937 {
1938         return vmci_trans(vsk)->notify_ops->recv_init(
1939                         &vsk->sk, target,
1940                         (struct vmci_transport_recv_notify_data *)data);
1941 }
1942 
1943 static int vmci_transport_notify_recv_pre_block(
1944         struct vsock_sock *vsk,
1945         size_t target,
1946         struct vsock_transport_recv_notify_data *data)
1947 {
1948         return vmci_trans(vsk)->notify_ops->recv_pre_block(
1949                         &vsk->sk, target,
1950                         (struct vmci_transport_recv_notify_data *)data);
1951 }
1952 
1953 static int vmci_transport_notify_recv_pre_dequeue(
1954         struct vsock_sock *vsk,
1955         size_t target,
1956         struct vsock_transport_recv_notify_data *data)
1957 {
1958         return vmci_trans(vsk)->notify_ops->recv_pre_dequeue(
1959                         &vsk->sk, target,
1960                         (struct vmci_transport_recv_notify_data *)data);
1961 }
1962 
1963 static int vmci_transport_notify_recv_post_dequeue(
1964         struct vsock_sock *vsk,
1965         size_t target,
1966         ssize_t copied,
1967         bool data_read,
1968         struct vsock_transport_recv_notify_data *data)
1969 {
1970         return vmci_trans(vsk)->notify_ops->recv_post_dequeue(
1971                         &vsk->sk, target, copied, data_read,
1972                         (struct vmci_transport_recv_notify_data *)data);
1973 }
1974 
1975 static int vmci_transport_notify_send_init(
1976         struct vsock_sock *vsk,
1977         struct vsock_transport_send_notify_data *data)
1978 {
1979         return vmci_trans(vsk)->notify_ops->send_init(
1980                         &vsk->sk,
1981                         (struct vmci_transport_send_notify_data *)data);
1982 }
1983 
1984 static int vmci_transport_notify_send_pre_block(
1985         struct vsock_sock *vsk,
1986         struct vsock_transport_send_notify_data *data)
1987 {
1988         return vmci_trans(vsk)->notify_ops->send_pre_block(
1989                         &vsk->sk,
1990                         (struct vmci_transport_send_notify_data *)data);
1991 }
1992 
1993 static int vmci_transport_notify_send_pre_enqueue(
1994         struct vsock_sock *vsk,
1995         struct vsock_transport_send_notify_data *data)
1996 {
1997         return vmci_trans(vsk)->notify_ops->send_pre_enqueue(
1998                         &vsk->sk,
1999                         (struct vmci_transport_send_notify_data *)data);
2000 }
2001 
2002 static int vmci_transport_notify_send_post_enqueue(
2003         struct vsock_sock *vsk,
2004         ssize_t written,
2005         struct vsock_transport_send_notify_data *data)
2006 {
2007         return vmci_trans(vsk)->notify_ops->send_post_enqueue(
2008                         &vsk->sk, written,
2009                         (struct vmci_transport_send_notify_data *)data);
2010 }
2011 
2012 static bool vmci_transport_old_proto_override(bool *old_pkt_proto)
2013 {
2014         if (PROTOCOL_OVERRIDE != -1) {
2015                 if (PROTOCOL_OVERRIDE == 0)
2016                         *old_pkt_proto = true;
2017                 else
2018                         *old_pkt_proto = false;
2019 
2020                 pr_info("Proto override in use\n");
2021                 return true;
2022         }
2023 
2024         return false;
2025 }
2026 
2027 static bool vmci_transport_proto_to_notify_struct(struct sock *sk,
2028                                                   u16 *proto,
2029                                                   bool old_pkt_proto)
2030 {
2031         struct vsock_sock *vsk = vsock_sk(sk);
2032 
2033         if (old_pkt_proto) {
2034                 if (*proto != VSOCK_PROTO_INVALID) {
2035                         pr_err("Can't set both an old and new protocol\n");
2036                         return false;
2037                 }
2038                 vmci_trans(vsk)->notify_ops = &vmci_transport_notify_pkt_ops;
2039                 goto exit;
2040         }
2041 
2042         switch (*proto) {
2043         case VSOCK_PROTO_PKT_ON_NOTIFY:
2044                 vmci_trans(vsk)->notify_ops =
2045                         &vmci_transport_notify_pkt_q_state_ops;
2046                 break;
2047         default:
2048                 pr_err("Unknown notify protocol version\n");
2049                 return false;
2050         }
2051 
2052 exit:
2053         vmci_trans(vsk)->notify_ops->socket_init(sk);
2054         return true;
2055 }
2056 
2057 static u16 vmci_transport_new_proto_supported_versions(void)
2058 {
2059         if (PROTOCOL_OVERRIDE != -1)
2060                 return PROTOCOL_OVERRIDE;
2061 
2062         return VSOCK_PROTO_ALL_SUPPORTED;
2063 }
2064 
2065 static u32 vmci_transport_get_local_cid(void)
2066 {
2067         return vmci_get_context_id();
2068 }
2069 
2070 static struct vsock_transport vmci_transport = {
2071         .init = vmci_transport_socket_init,
2072         .destruct = vmci_transport_destruct,
2073         .release = vmci_transport_release,
2074         .connect = vmci_transport_connect,
2075         .dgram_bind = vmci_transport_dgram_bind,
2076         .dgram_dequeue = vmci_transport_dgram_dequeue,
2077         .dgram_enqueue = vmci_transport_dgram_enqueue,
2078         .dgram_allow = vmci_transport_dgram_allow,
2079         .stream_dequeue = vmci_transport_stream_dequeue,
2080         .stream_enqueue = vmci_transport_stream_enqueue,
2081         .stream_has_data = vmci_transport_stream_has_data,
2082         .stream_has_space = vmci_transport_stream_has_space,
2083         .stream_rcvhiwat = vmci_transport_stream_rcvhiwat,
2084         .stream_is_active = vmci_transport_stream_is_active,
2085         .stream_allow = vmci_transport_stream_allow,
2086         .notify_poll_in = vmci_transport_notify_poll_in,
2087         .notify_poll_out = vmci_transport_notify_poll_out,
2088         .notify_recv_init = vmci_transport_notify_recv_init,
2089         .notify_recv_pre_block = vmci_transport_notify_recv_pre_block,
2090         .notify_recv_pre_dequeue = vmci_transport_notify_recv_pre_dequeue,
2091         .notify_recv_post_dequeue = vmci_transport_notify_recv_post_dequeue,
2092         .notify_send_init = vmci_transport_notify_send_init,
2093         .notify_send_pre_block = vmci_transport_notify_send_pre_block,
2094         .notify_send_pre_enqueue = vmci_transport_notify_send_pre_enqueue,
2095         .notify_send_post_enqueue = vmci_transport_notify_send_post_enqueue,
2096         .shutdown = vmci_transport_shutdown,
2097         .set_buffer_size = vmci_transport_set_buffer_size,
2098         .set_min_buffer_size = vmci_transport_set_min_buffer_size,
2099         .set_max_buffer_size = vmci_transport_set_max_buffer_size,
2100         .get_buffer_size = vmci_transport_get_buffer_size,
2101         .get_min_buffer_size = vmci_transport_get_min_buffer_size,
2102         .get_max_buffer_size = vmci_transport_get_max_buffer_size,
2103         .get_local_cid = vmci_transport_get_local_cid,
2104 };
2105 
2106 static int __init vmci_transport_init(void)
2107 {
2108         int err;
2109 
2110         /* Create the datagram handle that we will use to send and receive all
2111          * VSocket control messages for this context.
2112          */
2113         err = vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID,
2114                                                  VMCI_FLAG_ANYCID_DG_HND,
2115                                                  vmci_transport_recv_stream_cb,
2116                                                  NULL,
2117                                                  &vmci_transport_stream_handle);
2118         if (err < VMCI_SUCCESS) {
2119                 pr_err("Unable to create datagram handle. (%d)\n", err);
2120                 return vmci_transport_error_to_vsock_error(err);
2121         }
2122 
2123         err = vmci_event_subscribe(VMCI_EVENT_QP_RESUMED,
2124                                    vmci_transport_qp_resumed_cb,
2125                                    NULL, &vmci_transport_qp_resumed_sub_id);
2126         if (err < VMCI_SUCCESS) {
2127                 pr_err("Unable to subscribe to resumed event. (%d)\n", err);
2128                 err = vmci_transport_error_to_vsock_error(err);
2129                 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
2130                 goto err_destroy_stream_handle;
2131         }
2132 
2133         err = vsock_core_init(&vmci_transport);
2134         if (err < 0)
2135                 goto err_unsubscribe;
2136 
2137         return 0;
2138 
2139 err_unsubscribe:
2140         vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id);
2141 err_destroy_stream_handle:
2142         vmci_datagram_destroy_handle(vmci_transport_stream_handle);
2143         return err;
2144 }
2145 module_init(vmci_transport_init);
2146 
2147 static void __exit vmci_transport_exit(void)
2148 {
2149         if (!vmci_handle_is_invalid(vmci_transport_stream_handle)) {
2150                 if (vmci_datagram_destroy_handle(
2151                         vmci_transport_stream_handle) != VMCI_SUCCESS)
2152                         pr_err("Couldn't destroy datagram handle\n");
2153                 vmci_transport_stream_handle = VMCI_INVALID_HANDLE;
2154         }
2155 
2156         if (vmci_transport_qp_resumed_sub_id != VMCI_INVALID_ID) {
2157                 vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id);
2158                 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
2159         }
2160 
2161         vsock_core_exit();
2162 }
2163 module_exit(vmci_transport_exit);
2164 
2165 MODULE_AUTHOR("VMware, Inc.");
2166 MODULE_DESCRIPTION("VMCI transport for Virtual Sockets");
2167 MODULE_LICENSE("GPL v2");
2168 MODULE_ALIAS("vmware_vsock");
2169 MODULE_ALIAS_NETPROTO(PF_VSOCK);
2170 

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