net/vmw_vsock/vmci_transport.c

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