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 #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_detach_cb(u32 sub_id,
  44                                           const struct vmci_event_data *ed,
  45                                           void *client_data);
  46 static void vmci_transport_recv_pkt_work(struct work_struct *work);
  47 static void vmci_transport_cleanup(struct work_struct *work);
  48 static int vmci_transport_recv_listen(struct sock *sk,
  49                                       struct vmci_transport_packet *pkt);
  50 static int vmci_transport_recv_connecting_server(
  51                                         struct sock *sk,
  52                                         struct sock *pending,
  53                                         struct vmci_transport_packet *pkt);
  54 static int vmci_transport_recv_connecting_client(
  55                                         struct sock *sk,
  56                                         struct vmci_transport_packet *pkt);
  57 static int vmci_transport_recv_connecting_client_negotiate(
  58                                         struct sock *sk,
  59                                         struct vmci_transport_packet *pkt);
  60 static int vmci_transport_recv_connecting_client_invalid(
  61                                         struct sock *sk,
  62                                         struct vmci_transport_packet *pkt);
  63 static int vmci_transport_recv_connected(struct sock *sk,
  64                                          struct vmci_transport_packet *pkt);
  65 static bool vmci_transport_old_proto_override(bool *old_pkt_proto);
  66 static u16 vmci_transport_new_proto_supported_versions(void);
  67 static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto,
  68                                                   bool old_pkt_proto);
  69
  70 struct vmci_transport_recv_pkt_info {
  71         struct work_struct work;
  72         struct sock *sk;
  73         struct vmci_transport_packet pkt;
  74 };
  75
  76 static LIST_HEAD(vmci_transport_cleanup_list);
  77 static DEFINE_SPINLOCK(vmci_transport_cleanup_lock);
  78 static DECLARE_WORK(vmci_transport_cleanup_work, vmci_transport_cleanup);
  79
  80 static struct vmci_handle vmci_transport_stream_handle = { VMCI_INVALID_ID,
  81                                                            VMCI_INVALID_ID };
  82 static u32 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
  83
  84 static int PROTOCOL_OVERRIDE = -1;
  85
  86 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN   128
  87 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE       262144
  88 #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX   262144
  89
  90 /* The default peer timeout indicates how long we will wait for a peer response
  91  * to a control message.
  92  */
  93 #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
  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         switch (vmci_error) {
 100         case VMCI_ERROR_NO_MEM:
 101                 return -ENOMEM;
 102         case VMCI_ERROR_DUPLICATE_ENTRY:
 103         case VMCI_ERROR_ALREADY_EXISTS:
 104                 return -EADDRINUSE;
 105         case VMCI_ERROR_NO_ACCESS:
 106                 return -EPERM;
 107         case VMCI_ERROR_NO_RESOURCES:
 108                 return -ENOBUFS;
 109         case VMCI_ERROR_INVALID_RESOURCE:
 110                 return -EHOSTUNREACH;
 111         case VMCI_ERROR_INVALID_ARGS:
 112         default:
 113                 break;
 114         }
 115         return -EINVAL;
 116 }
 117
 118 static u32 vmci_transport_peer_rid(u32 peer_cid)
 119 {
 120         if (VMADDR_CID_HYPERVISOR == peer_cid)
 121                 return VMCI_TRANSPORT_HYPERVISOR_PACKET_RID;
 122
 123         return VMCI_TRANSPORT_PACKET_RID;
 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_peer_rid(dst->svm_cid));
 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_alloc_send_control_pkt(struct sockaddr_vm *src,
 269                                       struct sockaddr_vm *dst,
 270                                       enum vmci_transport_packet_type type,
 271                                       u64 size,
 272                                       u64 mode,
 273                                       struct vmci_transport_waiting_info *wait,
 274                                       u16 proto,
 275                                       struct vmci_handle handle)
 276 {
 277         struct vmci_transport_packet *pkt;
 278         int err;
 279
 280         pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
 281         if (!pkt)
 282                 return -ENOMEM;
 283
 284         err = __vmci_transport_send_control_pkt(pkt, src, dst, type, size,
 285                                                 mode, wait, proto, handle,
 286                                                 true);
 287         kfree(pkt);
 288
 289         return err;
 290 }
 291
 292 static int
 293 vmci_transport_send_control_pkt(struct sock *sk,
 294                                 enum vmci_transport_packet_type type,
 295                                 u64 size,
 296                                 u64 mode,
 297                                 struct vmci_transport_waiting_info *wait,
 298                                 u16 proto,
 299                                 struct vmci_handle handle)
 300 {
 301         struct vsock_sock *vsk;
 302
 303         vsk = vsock_sk(sk);
 304
 305         if (!vsock_addr_bound(&vsk->local_addr))
 306                 return -EINVAL;
 307
 308         if (!vsock_addr_bound(&vsk->remote_addr))
 309                 return -EINVAL;
 310
 311         return vmci_transport_alloc_send_control_pkt(&vsk->local_addr,
 312                                                      &vsk->remote_addr,
 313                                                      type, size, mode,
 314                                                      wait, proto, handle);
 315 }
 316
 317 static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst,
 318                                         struct sockaddr_vm *src,
 319                                         struct vmci_transport_packet *pkt)
 320 {
 321         if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST)
 322                 return 0;
 323         return vmci_transport_send_control_pkt_bh(
 324                                         dst, src,
 325                                         VMCI_TRANSPORT_PACKET_TYPE_RST, 0,
 326                                         0, NULL, VMCI_INVALID_HANDLE);
 327 }
 328
 329 static int vmci_transport_send_reset(struct sock *sk,
 330                                      struct vmci_transport_packet *pkt)
 331 {
 332         struct sockaddr_vm *dst_ptr;
 333         struct sockaddr_vm dst;
 334         struct vsock_sock *vsk;
 335
 336         if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST)
 337                 return 0;
 338
 339         vsk = vsock_sk(sk);
 340
 341         if (!vsock_addr_bound(&vsk->local_addr))
 342                 return -EINVAL;
 343
 344         if (vsock_addr_bound(&vsk->remote_addr)) {
 345                 dst_ptr = &vsk->remote_addr;
 346         } else {
 347                 vsock_addr_init(&dst, pkt->dg.src.context,
 348                                 pkt->src_port);
 349                 dst_ptr = &dst;
 350         }
 351         return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, dst_ptr,
 352                                              VMCI_TRANSPORT_PACKET_TYPE_RST,
 353                                              0, 0, NULL, VSOCK_PROTO_INVALID,
 354                                              VMCI_INVALID_HANDLE);
 355 }
 356
 357 static int vmci_transport_send_negotiate(struct sock *sk, size_t size)
 358 {
 359         return vmci_transport_send_control_pkt(
 360                                         sk,
 361                                         VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE,
 362                                         size, 0, NULL,
 363                                         VSOCK_PROTO_INVALID,
 364                                         VMCI_INVALID_HANDLE);
 365 }
 366
 367 static int vmci_transport_send_negotiate2(struct sock *sk, size_t size,
 368                                           u16 version)
 369 {
 370         return vmci_transport_send_control_pkt(
 371                                         sk,
 372                                         VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2,
 373                                         size, 0, NULL, version,
 374                                         VMCI_INVALID_HANDLE);
 375 }
 376
 377 static int vmci_transport_send_qp_offer(struct sock *sk,
 378                                         struct vmci_handle handle)
 379 {
 380         return vmci_transport_send_control_pkt(
 381                                         sk, VMCI_TRANSPORT_PACKET_TYPE_OFFER, 0,
 382                                         0, NULL,
 383                                         VSOCK_PROTO_INVALID, handle);
 384 }
 385
 386 static int vmci_transport_send_attach(struct sock *sk,
 387                                       struct vmci_handle handle)
 388 {
 389         return vmci_transport_send_control_pkt(
 390                                         sk, VMCI_TRANSPORT_PACKET_TYPE_ATTACH,
 391                                         0, 0, NULL, VSOCK_PROTO_INVALID,
 392                                         handle);
 393 }
 394
 395 static int vmci_transport_reply_reset(struct vmci_transport_packet *pkt)
 396 {
 397         return vmci_transport_reply_control_pkt_fast(
 398                                                 pkt,
 399                                                 VMCI_TRANSPORT_PACKET_TYPE_RST,
 400                                                 0, 0, NULL,
 401                                                 VMCI_INVALID_HANDLE);
 402 }
 403
 404 static int vmci_transport_send_invalid_bh(struct sockaddr_vm *dst,
 405                                           struct sockaddr_vm *src)
 406 {
 407         return vmci_transport_send_control_pkt_bh(
 408                                         dst, src,
 409                                         VMCI_TRANSPORT_PACKET_TYPE_INVALID,
 410                                         0, 0, NULL, VMCI_INVALID_HANDLE);
 411 }
 412
 413 int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst,
 414                                  struct sockaddr_vm *src)
 415 {
 416         return vmci_transport_send_control_pkt_bh(
 417                                         dst, src,
 418                                         VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0,
 419                                         0, NULL, VMCI_INVALID_HANDLE);
 420 }
 421
 422 int vmci_transport_send_read_bh(struct sockaddr_vm *dst,
 423                                 struct sockaddr_vm *src)
 424 {
 425         return vmci_transport_send_control_pkt_bh(
 426                                         dst, src,
 427                                         VMCI_TRANSPORT_PACKET_TYPE_READ, 0,
 428                                         0, NULL, VMCI_INVALID_HANDLE);
 429 }
 430
 431 int vmci_transport_send_wrote(struct sock *sk)
 432 {
 433         return vmci_transport_send_control_pkt(
 434                                         sk, VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0,
 435                                         0, NULL, VSOCK_PROTO_INVALID,
 436                                         VMCI_INVALID_HANDLE);
 437 }
 438
 439 int vmci_transport_send_read(struct sock *sk)
 440 {
 441         return vmci_transport_send_control_pkt(
 442                                         sk, VMCI_TRANSPORT_PACKET_TYPE_READ, 0,
 443                                         0, NULL, VSOCK_PROTO_INVALID,
 444                                         VMCI_INVALID_HANDLE);
 445 }
 446
 447 int vmci_transport_send_waiting_write(struct sock *sk,
 448                                       struct vmci_transport_waiting_info *wait)
 449 {
 450         return vmci_transport_send_control_pkt(
 451                                 sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE,
 452                                 0, 0, wait, VSOCK_PROTO_INVALID,
 453                                 VMCI_INVALID_HANDLE);
 454 }
 455
 456 int vmci_transport_send_waiting_read(struct sock *sk,
 457                                      struct vmci_transport_waiting_info *wait)
 458 {
 459         return vmci_transport_send_control_pkt(
 460                                 sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ,
 461                                 0, 0, wait, VSOCK_PROTO_INVALID,
 462                                 VMCI_INVALID_HANDLE);
 463 }
 464
 465 static int vmci_transport_shutdown(struct vsock_sock *vsk, int mode)
 466 {
 467         return vmci_transport_send_control_pkt(
 468                                         &vsk->sk,
 469                                         VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN,
 470                                         0, mode, NULL,
 471                                         VSOCK_PROTO_INVALID,
 472                                         VMCI_INVALID_HANDLE);
 473 }
 474
 475 static int vmci_transport_send_conn_request(struct sock *sk, size_t size)
 476 {
 477         return vmci_transport_send_control_pkt(sk,
 478                                         VMCI_TRANSPORT_PACKET_TYPE_REQUEST,
 479                                         size, 0, NULL,
 480                                         VSOCK_PROTO_INVALID,
 481                                         VMCI_INVALID_HANDLE);
 482 }
 483
 484 static int vmci_transport_send_conn_request2(struct sock *sk, size_t size,
 485                                              u16 version)
 486 {
 487         return vmci_transport_send_control_pkt(
 488                                         sk, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2,
 489                                         size, 0, NULL, version,
 490                                         VMCI_INVALID_HANDLE);
 491 }
 492
 493 static struct sock *vmci_transport_get_pending(
 494                                         struct sock *listener,
 495                                         struct vmci_transport_packet *pkt)
 496 {
 497         struct vsock_sock *vlistener;
 498         struct vsock_sock *vpending;
 499         struct sock *pending;
 500         struct sockaddr_vm src;
 501
 502         vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port);
 503
 504         vlistener = vsock_sk(listener);
 505
 506         list_for_each_entry(vpending, &vlistener->pending_links,
 507                             pending_links) {
 508                 if (vsock_addr_equals_addr(&src, &vpending->remote_addr) &&
 509                     pkt->dst_port == vpending->local_addr.svm_port) {
 510                         pending = sk_vsock(vpending);
 511                         sock_hold(pending);
 512                         goto found;
 513                 }
 514         }
 515
 516         pending = NULL;
 517 found:
 518         return pending;
 519
 520 }
 521
 522 static void vmci_transport_release_pending(struct sock *pending)
 523 {
 524         sock_put(pending);
 525 }
 526
 527 /* We allow two kinds of sockets to communicate with a restricted VM: 1)
 528  * trusted sockets 2) sockets from applications running as the same user as the
 529  * VM (this is only true for the host side and only when using hosted products)
 530  */
 531
 532 static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid)
 533 {
 534         return vsock->trusted ||
 535                vmci_is_context_owner(peer_cid, vsock->owner->uid);
 536 }
 537
 538 /* We allow sending datagrams to and receiving datagrams from a restricted VM
 539  * only if it is trusted as described in vmci_transport_is_trusted.
 540  */
 541
 542 static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid)
 543 {
 544         if (VMADDR_CID_HYPERVISOR == peer_cid)
 545                 return true;
 546
 547         if (vsock->cached_peer != peer_cid) {
 548                 vsock->cached_peer = peer_cid;
 549                 if (!vmci_transport_is_trusted(vsock, peer_cid) &&
 550                     (vmci_context_get_priv_flags(peer_cid) &
 551                      VMCI_PRIVILEGE_FLAG_RESTRICTED)) {
 552                         vsock->cached_peer_allow_dgram = false;
 553                 } else {
 554                         vsock->cached_peer_allow_dgram = true;
 555                 }
 556         }
 557
 558         return vsock->cached_peer_allow_dgram;
 559 }
 560
 561 static int
 562 vmci_transport_queue_pair_alloc(struct vmci_qp **qpair,
 563                                 struct vmci_handle *handle,
 564                                 u64 produce_size,
 565                                 u64 consume_size,
 566                                 u32 peer, u32 flags, bool trusted)
 567 {
 568         int err = 0;
 569
 570         if (trusted) {
 571                 /* Try to allocate our queue pair as trusted. This will only
 572                  * work if vsock is running in the host.
 573                  */
 574
 575                 err = vmci_qpair_alloc(qpair, handle, produce_size,
 576                                        consume_size,
 577                                        peer, flags,
 578                                        VMCI_PRIVILEGE_FLAG_TRUSTED);
 579                 if (err != VMCI_ERROR_NO_ACCESS)
 580                         goto out;
 581
 582         }
 583
 584         err = vmci_qpair_alloc(qpair, handle, produce_size, consume_size,
 585                                peer, flags, VMCI_NO_PRIVILEGE_FLAGS);
 586 out:
 587         if (err < 0) {
 588                 pr_err_once("Could not attach to queue pair with %d\n", err);
 589                 err = vmci_transport_error_to_vsock_error(err);
 590         }
 591
 592         return err;
 593 }
 594
 595 static int
 596 vmci_transport_datagram_create_hnd(u32 resource_id,
 597                                    u32 flags,
 598                                    vmci_datagram_recv_cb recv_cb,
 599                                    void *client_data,
 600                                    struct vmci_handle *out_handle)
 601 {
 602         int err = 0;
 603
 604         /* Try to allocate our datagram handler as trusted. This will only work
 605          * if vsock is running in the host.
 606          */
 607
 608         err = vmci_datagram_create_handle_priv(resource_id, flags,
 609                                                VMCI_PRIVILEGE_FLAG_TRUSTED,
 610                                                recv_cb,
 611                                                client_data, out_handle);
 612
 613         if (err == VMCI_ERROR_NO_ACCESS)
 614                 err = vmci_datagram_create_handle(resource_id, flags,
 615                                                   recv_cb, client_data,
 616                                                   out_handle);
 617
 618         return err;
 619 }
 620
 621 /* This is invoked as part of a tasklet that's scheduled when the VMCI
 622  * interrupt fires.  This is run in bottom-half context and if it ever needs to
 623  * sleep it should defer that work to a work queue.
 624  */
 625
 626 static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg)
 627 {
 628         struct sock *sk;
 629         size_t size;
 630         struct sk_buff *skb;
 631         struct vsock_sock *vsk;
 632
 633         sk = (struct sock *)data;
 634
 635         /* This handler is privileged when this module is running on the host.
 636          * We will get datagrams from all endpoints (even VMs that are in a
 637          * restricted context). If we get one from a restricted context then
 638          * the destination socket must be trusted.
 639          *
 640          * NOTE: We access the socket struct without holding the lock here.
 641          * This is ok because the field we are interested is never modified
 642          * outside of the create and destruct socket functions.
 643          */
 644         vsk = vsock_sk(sk);
 645         if (!vmci_transport_allow_dgram(vsk, dg->src.context))
 646                 return VMCI_ERROR_NO_ACCESS;
 647
 648         size = VMCI_DG_SIZE(dg);
 649
 650         /* Attach the packet to the socket's receive queue as an sk_buff. */
 651         skb = alloc_skb(size, GFP_ATOMIC);
 652         if (!skb)
 653                 return VMCI_ERROR_NO_MEM;
 654
 655         /* sk_receive_skb() will do a sock_put(), so hold here. */
 656         sock_hold(sk);
 657         skb_put(skb, size);
 658         memcpy(skb->data, dg, size);
 659         sk_receive_skb(sk, skb, 0);
 660
 661         return VMCI_SUCCESS;
 662 }
 663
 664 static bool vmci_transport_stream_allow(u32 cid, u32 port)
 665 {
 666         static const u32 non_socket_contexts[] = {
 667                 VMADDR_CID_RESERVED,
 668         };
 669         int i;
 670
 671         BUILD_BUG_ON(sizeof(cid) != sizeof(*non_socket_contexts));
 672
 673         for (i = 0; i < ARRAY_SIZE(non_socket_contexts); i++) {
 674                 if (cid == non_socket_contexts[i])
 675                         return false;
 676         }
 677
 678         return true;
 679 }
 680
 681 /* This is invoked as part of a tasklet that's scheduled when the VMCI
 682  * interrupt fires.  This is run in bottom-half context but it defers most of
 683  * its work to the packet handling work queue.
 684  */
 685
 686 static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg)
 687 {
 688         struct sock *sk;
 689         struct sockaddr_vm dst;
 690         struct sockaddr_vm src;
 691         struct vmci_transport_packet *pkt;
 692         struct vsock_sock *vsk;
 693         bool bh_process_pkt;
 694         int err;
 695
 696         sk = NULL;
 697         err = VMCI_SUCCESS;
 698         bh_process_pkt = false;
 699
 700         /* Ignore incoming packets from contexts without sockets, or resources
 701          * that aren't vsock implementations.
 702          */
 703
 704         if (!vmci_transport_stream_allow(dg->src.context, -1)
 705             || vmci_transport_peer_rid(dg->src.context) != dg->src.resource)
 706                 return VMCI_ERROR_NO_ACCESS;
 707
 708         if (VMCI_DG_SIZE(dg) < sizeof(*pkt))
 709                 /* Drop datagrams that do not contain full VSock packets. */
 710                 return VMCI_ERROR_INVALID_ARGS;
 711
 712         pkt = (struct vmci_transport_packet *)dg;
 713
 714         /* Find the socket that should handle this packet.  First we look for a
 715          * connected socket and if there is none we look for a socket bound to
 716          * the destintation address.
 717          */
 718         vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port);
 719         vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port);
 720
 721         sk = vsock_find_connected_socket(&src, &dst);
 722         if (!sk) {
 723                 sk = vsock_find_bound_socket(&dst);
 724                 if (!sk) {
 725                         /* We could not find a socket for this specified
 726                          * address.  If this packet is a RST, we just drop it.
 727                          * If it is another packet, we send a RST.  Note that
 728                          * we do not send a RST reply to RSTs so that we do not
 729                          * continually send RSTs between two endpoints.
 730                          *
 731                          * Note that since this is a reply, dst is src and src
 732                          * is dst.
 733                          */
 734                         if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0)
 735                                 pr_err("unable to send reset\n");
 736
 737                         err = VMCI_ERROR_NOT_FOUND;
 738                         goto out;
 739                 }
 740         }
 741
 742         /* If the received packet type is beyond all types known to this
 743          * implementation, reply with an invalid message.  Hopefully this will
 744          * help when implementing backwards compatibility in the future.
 745          */
 746         if (pkt->type >= VMCI_TRANSPORT_PACKET_TYPE_MAX) {
 747                 vmci_transport_send_invalid_bh(&dst, &src);
 748                 err = VMCI_ERROR_INVALID_ARGS;
 749                 goto out;
 750         }
 751
 752         /* This handler is privileged when this module is running on the host.
 753          * We will get datagram connect requests from all endpoints (even VMs
 754          * that are in a restricted context). If we get one from a restricted
 755          * context then the destination socket must be trusted.
 756          *
 757          * NOTE: We access the socket struct without holding the lock here.
 758          * This is ok because the field we are interested is never modified
 759          * outside of the create and destruct socket functions.
 760          */
 761         vsk = vsock_sk(sk);
 762         if (!vmci_transport_allow_dgram(vsk, pkt->dg.src.context)) {
 763                 err = VMCI_ERROR_NO_ACCESS;
 764                 goto out;
 765         }
 766
 767         /* We do most everything in a work queue, but let's fast path the
 768          * notification of reads and writes to help data transfer performance.
 769          * We can only do this if there is no process context code executing
 770          * for this socket since that may change the state.
 771          */
 772         bh_lock_sock(sk);
 773
 774         if (!sock_owned_by_user(sk)) {
 775                 /* The local context ID may be out of date, update it. */
 776                 vsk->local_addr.svm_cid = dst.svm_cid;
 777
 778                 if (sk->sk_state == TCP_ESTABLISHED)
 779                         vmci_trans(vsk)->notify_ops->handle_notify_pkt(
 780                                         sk, pkt, true, &dst, &src,
 781                                         &bh_process_pkt);
 782         }
 783
 784         bh_unlock_sock(sk);
 785
 786         if (!bh_process_pkt) {
 787                 struct vmci_transport_recv_pkt_info *recv_pkt_info;
 788
 789                 recv_pkt_info = kmalloc(sizeof(*recv_pkt_info), GFP_ATOMIC);
 790                 if (!recv_pkt_info) {
 791                         if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0)
 792                                 pr_err("unable to send reset\n");
 793
 794                         err = VMCI_ERROR_NO_MEM;
 795                         goto out;
 796                 }
 797
 798                 recv_pkt_info->sk = sk;
 799                 memcpy(&recv_pkt_info->pkt, pkt, sizeof(recv_pkt_info->pkt));
 800                 INIT_WORK(&recv_pkt_info->work, vmci_transport_recv_pkt_work);
 801
 802                 schedule_work(&recv_pkt_info->work);
 803                 /* Clear sk so that the reference count incremented by one of
 804                  * the Find functions above is not decremented below.  We need
 805                  * that reference count for the packet handler we've scheduled
 806                  * to run.
 807                  */
 808                 sk = NULL;
 809         }
 810
 811 out:
 812         if (sk)
 813                 sock_put(sk);
 814
 815         return err;
 816 }
 817
 818 static void vmci_transport_handle_detach(struct sock *sk)
 819 {
 820         struct vsock_sock *vsk;
 821
 822         vsk = vsock_sk(sk);
 823         if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) {
 824                 sock_set_flag(sk, SOCK_DONE);
 825
 826                 /* On a detach the peer will not be sending or receiving
 827                  * anymore.
 828                  */
 829                 vsk->peer_shutdown = SHUTDOWN_MASK;
 830
 831                 /* We should not be sending anymore since the peer won't be
 832                  * there to receive, but we can still receive if there is data
 833                  * left in our consume queue.
 834                  */
 835                 if (vsock_stream_has_data(vsk) <= 0) {
 836                         sk->sk_state = TCP_CLOSE;
 837
 838                         if (sk->sk_state == TCP_SYN_SENT) {
 839                                 /* The peer may detach from a queue pair while
 840                                  * we are still in the connecting state, i.e.,
 841                                  * if the peer VM is killed after attaching to
 842                                  * a queue pair, but before we complete the
 843                                  * handshake. In that case, we treat the detach
 844                                  * event like a reset.
 845                                  */
 846
 847                                 sk->sk_err = ECONNRESET;
 848                                 sk->sk_error_report(sk);
 849                                 return;
 850                         }
 851                 }
 852                 sk->sk_state_change(sk);
 853         }
 854 }
 855
 856 static void vmci_transport_peer_detach_cb(u32 sub_id,
 857                                           const struct vmci_event_data *e_data,
 858                                           void *client_data)
 859 {
 860         struct vmci_transport *trans = client_data;
 861         const struct vmci_event_payload_qp *e_payload;
 862
 863         e_payload = vmci_event_data_const_payload(e_data);
 864
 865         /* XXX This is lame, we should provide a way to lookup sockets by
 866          * qp_handle.
 867          */
 868         if (vmci_handle_is_invalid(e_payload->handle) ||
 869             !vmci_handle_is_equal(trans->qp_handle, e_payload->handle))
 870                 return;
 871
 872         /* We don't ask for delayed CBs when we subscribe to this event (we
 873          * pass 0 as flags to vmci_event_subscribe()).  VMCI makes no
 874          * guarantees in that case about what context we might be running in,
 875          * so it could be BH or process, blockable or non-blockable.  So we
 876          * need to account for all possible contexts here.
 877          */
 878         spin_lock_bh(&trans->lock);
 879         if (!trans->sk)
 880                 goto out;
 881
 882         /* Apart from here, trans->lock is only grabbed as part of sk destruct,
 883          * where trans->sk isn't locked.
 884          */
 885         bh_lock_sock(trans->sk);
 886
 887         vmci_transport_handle_detach(trans->sk);
 888
 889         bh_unlock_sock(trans->sk);
 890  out:
 891         spin_unlock_bh(&trans->lock);
 892 }
 893
 894 static void vmci_transport_qp_resumed_cb(u32 sub_id,
 895                                          const struct vmci_event_data *e_data,
 896                                          void *client_data)
 897 {
 898         vsock_for_each_connected_socket(vmci_transport_handle_detach);
 899 }
 900
 901 static void vmci_transport_recv_pkt_work(struct work_struct *work)
 902 {
 903         struct vmci_transport_recv_pkt_info *recv_pkt_info;
 904         struct vmci_transport_packet *pkt;
 905         struct sock *sk;
 906
 907         recv_pkt_info =
 908                 container_of(work, struct vmci_transport_recv_pkt_info, work);
 909         sk = recv_pkt_info->sk;
 910         pkt = &recv_pkt_info->pkt;
 911
 912         lock_sock(sk);
 913
 914         /* The local context ID may be out of date. */
 915         vsock_sk(sk)->local_addr.svm_cid = pkt->dg.dst.context;
 916
 917         switch (sk->sk_state) {
 918         case TCP_LISTEN:
 919                 vmci_transport_recv_listen(sk, pkt);
 920                 break;
 921         case TCP_SYN_SENT:
 922                 /* Processing of pending connections for servers goes through
 923                  * the listening socket, so see vmci_transport_recv_listen()
 924                  * for that path.
 925                  */
 926                 vmci_transport_recv_connecting_client(sk, pkt);
 927                 break;
 928         case TCP_ESTABLISHED:
 929                 vmci_transport_recv_connected(sk, pkt);
 930                 break;
 931         default:
 932                 /* Because this function does not run in the same context as
 933                  * vmci_transport_recv_stream_cb it is possible that the
 934                  * socket has closed. We need to let the other side know or it
 935                  * could be sitting in a connect and hang forever. Send a
 936                  * reset to prevent that.
 937                  */
 938                 vmci_transport_send_reset(sk, pkt);
 939                 break;
 940         }
 941
 942         release_sock(sk);
 943         kfree(recv_pkt_info);
 944         /* Release reference obtained in the stream callback when we fetched
 945          * this socket out of the bound or connected list.
 946          */
 947         sock_put(sk);
 948 }
 949
 950 static int vmci_transport_recv_listen(struct sock *sk,
 951                                       struct vmci_transport_packet *pkt)
 952 {
 953         struct sock *pending;
 954         struct vsock_sock *vpending;
 955         int err;
 956         u64 qp_size;
 957         bool old_request = false;
 958         bool old_pkt_proto = false;
 959
 960         err = 0;
 961
 962         /* Because we are in the listen state, we could be receiving a packet
 963          * for ourself or any previous connection requests that we received.
 964          * If it's the latter, we try to find a socket in our list of pending
 965          * connections and, if we do, call the appropriate handler for the
 966          * state that that socket is in.  Otherwise we try to service the
 967          * connection request.
 968          */
 969         pending = vmci_transport_get_pending(sk, pkt);
 970         if (pending) {
 971                 lock_sock(pending);
 972
 973                 /* The local context ID may be out of date. */
 974                 vsock_sk(pending)->local_addr.svm_cid = pkt->dg.dst.context;
 975
 976                 switch (pending->sk_state) {
 977                 case TCP_SYN_SENT:
 978                         err = vmci_transport_recv_connecting_server(sk,
 979                                                                     pending,
 980                                                                     pkt);
 981                         break;
 982                 default:
 983                         vmci_transport_send_reset(pending, pkt);
 984                         err = -EINVAL;
 985                 }
 986
 987                 if (err < 0)
 988                         vsock_remove_pending(sk, pending);
 989
 990                 release_sock(pending);
 991                 vmci_transport_release_pending(pending);
 992
 993                 return err;
 994         }
 995
 996         /* The listen state only accepts connection requests.  Reply with a
 997          * reset unless we received a reset.
 998          */
 999
1000         if (!(pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST ||
1001               pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)) {
1002                 vmci_transport_reply_reset(pkt);
1003                 return -EINVAL;
1004         }
1005
1006         if (pkt->u.size == 0) {
1007                 vmci_transport_reply_reset(pkt);
1008                 return -EINVAL;
1009         }
1010
1011         /* If this socket can't accommodate this connection request, we send a
1012          * reset.  Otherwise we create and initialize a child socket and reply
1013          * with a connection negotiation.
1014          */
1015         if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) {
1016                 vmci_transport_reply_reset(pkt);
1017                 return -ECONNREFUSED;
1018         }
1019
1020         pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
1021                                  sk->sk_type, 0);
1022         if (!pending) {
1023                 vmci_transport_send_reset(sk, pkt);
1024                 return -ENOMEM;
1025         }
1026
1027         vpending = vsock_sk(pending);
1028
1029         vsock_addr_init(&vpending->local_addr, pkt->dg.dst.context,
1030                         pkt->dst_port);
1031         vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context,
1032                         pkt->src_port);
1033
1034         /* If the proposed size fits within our min/max, accept it. Otherwise
1035          * propose our own size.
1036          */
1037         if (pkt->u.size >= vmci_trans(vpending)->queue_pair_min_size &&
1038             pkt->u.size <= vmci_trans(vpending)->queue_pair_max_size) {
1039                 qp_size = pkt->u.size;
1040         } else {
1041                 qp_size = vmci_trans(vpending)->queue_pair_size;
1042         }
1043
1044         /* Figure out if we are using old or new requests based on the
1045          * overrides pkt types sent by our peer.
1046          */
1047         if (vmci_transport_old_proto_override(&old_pkt_proto)) {
1048                 old_request = old_pkt_proto;
1049         } else {
1050                 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST)
1051                         old_request = true;
1052                 else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)
1053                         old_request = false;
1054
1055         }
1056
1057         if (old_request) {
1058                 /* Handle a REQUEST (or override) */
1059                 u16 version = VSOCK_PROTO_INVALID;
1060                 if (vmci_transport_proto_to_notify_struct(
1061                         pending, &version, true))
1062                         err = vmci_transport_send_negotiate(pending, qp_size);
1063                 else
1064                         err = -EINVAL;
1065
1066         } else {
1067                 /* Handle a REQUEST2 (or override) */
1068                 int proto_int = pkt->proto;
1069                 int pos;
1070                 u16 active_proto_version = 0;
1071
1072                 /* The list of possible protocols is the intersection of all
1073                  * protocols the client supports ... plus all the protocols we
1074                  * support.
1075                  */
1076                 proto_int &= vmci_transport_new_proto_supported_versions();
1077
1078                 /* We choose the highest possible protocol version and use that
1079                  * one.
1080                  */
1081                 pos = fls(proto_int);
1082                 if (pos) {
1083                         active_proto_version = (1 << (pos - 1));
1084                         if (vmci_transport_proto_to_notify_struct(
1085                                 pending, &active_proto_version, false))
1086                                 err = vmci_transport_send_negotiate2(pending,
1087                                                         qp_size,
1088                                                         active_proto_version);
1089                         else
1090                                 err = -EINVAL;
1091
1092                 } else {
1093                         err = -EINVAL;
1094                 }
1095         }
1096
1097         if (err < 0) {
1098                 vmci_transport_send_reset(sk, pkt);
1099                 sock_put(pending);
1100                 err = vmci_transport_error_to_vsock_error(err);
1101                 goto out;
1102         }
1103
1104         vsock_add_pending(sk, pending);
1105         sk->sk_ack_backlog++;
1106
1107         pending->sk_state = TCP_SYN_SENT;
1108         vmci_trans(vpending)->produce_size =
1109                 vmci_trans(vpending)->consume_size = qp_size;
1110         vmci_trans(vpending)->queue_pair_size = qp_size;
1111
1112         vmci_trans(vpending)->notify_ops->process_request(pending);
1113
1114         /* We might never receive another message for this socket and it's not
1115          * connected to any process, so we have to ensure it gets cleaned up
1116          * ourself.  Our delayed work function will take care of that.  Note
1117          * that we do not ever cancel this function since we have few
1118          * guarantees about its state when calling cancel_delayed_work().
1119          * Instead we hold a reference on the socket for that function and make
1120          * it capable of handling cases where it needs to do nothing but
1121          * release that reference.
1122          */
1123         vpending->listener = sk;
1124         sock_hold(sk);
1125         sock_hold(pending);
1126         schedule_delayed_work(&vpending->pending_work, HZ);
1127
1128 out:
1129         return err;
1130 }
1131
1132 static int
1133 vmci_transport_recv_connecting_server(struct sock *listener,
1134                                       struct sock *pending,
1135                                       struct vmci_transport_packet *pkt)
1136 {
1137         struct vsock_sock *vpending;
1138         struct vmci_handle handle;
1139         struct vmci_qp *qpair;
1140         bool is_local;
1141         u32 flags;
1142         u32 detach_sub_id;
1143         int err;
1144         int skerr;
1145
1146         vpending = vsock_sk(pending);
1147         detach_sub_id = VMCI_INVALID_ID;
1148
1149         switch (pkt->type) {
1150         case VMCI_TRANSPORT_PACKET_TYPE_OFFER:
1151                 if (vmci_handle_is_invalid(pkt->u.handle)) {
1152                         vmci_transport_send_reset(pending, pkt);
1153                         skerr = EPROTO;
1154                         err = -EINVAL;
1155                         goto destroy;
1156                 }
1157                 break;
1158         default:
1159                 /* Close and cleanup the connection. */
1160                 vmci_transport_send_reset(pending, pkt);
1161                 skerr = EPROTO;
1162                 err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL;
1163                 goto destroy;
1164         }
1165
1166         /* In order to complete the connection we need to attach to the offered
1167          * queue pair and send an attach notification.  We also subscribe to the
1168          * detach event so we know when our peer goes away, and we do that
1169          * before attaching so we don't miss an event.  If all this succeeds,
1170          * we update our state and wakeup anything waiting in accept() for a
1171          * connection.
1172          */
1173
1174         /* We don't care about attach since we ensure the other side has
1175          * attached by specifying the ATTACH_ONLY flag below.
1176          */
1177         err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH,
1178                                    vmci_transport_peer_detach_cb,
1179                                    vmci_trans(vpending), &detach_sub_id);
1180         if (err < VMCI_SUCCESS) {
1181                 vmci_transport_send_reset(pending, pkt);
1182                 err = vmci_transport_error_to_vsock_error(err);
1183                 skerr = -err;
1184                 goto destroy;
1185         }
1186
1187         vmci_trans(vpending)->detach_sub_id = detach_sub_id;
1188
1189         /* Now attach to the queue pair the client created. */
1190         handle = pkt->u.handle;
1191
1192         /* vpending->local_addr always has a context id so we do not need to
1193          * worry about VMADDR_CID_ANY in this case.
1194          */
1195         is_local =
1196             vpending->remote_addr.svm_cid == vpending->local_addr.svm_cid;
1197         flags = VMCI_QPFLAG_ATTACH_ONLY;
1198         flags |= is_local ? VMCI_QPFLAG_LOCAL : 0;
1199
1200         err = vmci_transport_queue_pair_alloc(
1201                                         &qpair,
1202                                         &handle,
1203                                         vmci_trans(vpending)->produce_size,
1204                                         vmci_trans(vpending)->consume_size,
1205                                         pkt->dg.src.context,
1206                                         flags,
1207                                         vmci_transport_is_trusted(
1208                                                 vpending,
1209                                                 vpending->remote_addr.svm_cid));
1210         if (err < 0) {
1211                 vmci_transport_send_reset(pending, pkt);
1212                 skerr = -err;
1213                 goto destroy;
1214         }
1215
1216         vmci_trans(vpending)->qp_handle = handle;
1217         vmci_trans(vpending)->qpair = qpair;
1218
1219         /* When we send the attach message, we must be ready to handle incoming
1220          * control messages on the newly connected socket. So we move the
1221          * pending socket to the connected state before sending the attach
1222          * message. Otherwise, an incoming packet triggered by the attach being
1223          * received by the peer may be processed concurrently with what happens
1224          * below after sending the attach message, and that incoming packet
1225          * will find the listening socket instead of the (currently) pending
1226          * socket. Note that enqueueing the socket increments the reference
1227          * count, so even if a reset comes before the connection is accepted,
1228          * the socket will be valid until it is removed from the queue.
1229          *
1230          * If we fail sending the attach below, we remove the socket from the
1231          * connected list and move the socket to TCP_CLOSE before
1232          * releasing the lock, so a pending slow path processing of an incoming
1233          * packet will not see the socket in the connected state in that case.
1234          */
1235         pending->sk_state = TCP_ESTABLISHED;
1236
1237         vsock_insert_connected(vpending);
1238
1239         /* Notify our peer of our attach. */
1240         err = vmci_transport_send_attach(pending, handle);
1241         if (err < 0) {
1242                 vsock_remove_connected(vpending);
1243                 pr_err("Could not send attach\n");
1244                 vmci_transport_send_reset(pending, pkt);
1245                 err = vmci_transport_error_to_vsock_error(err);
1246                 skerr = -err;
1247                 goto destroy;
1248         }
1249
1250         /* We have a connection. Move the now connected socket from the
1251          * listener's pending list to the accept queue so callers of accept()
1252          * can find it.
1253          */
1254         vsock_remove_pending(listener, pending);
1255         vsock_enqueue_accept(listener, pending);
1256
1257         /* Callers of accept() will be be waiting on the listening socket, not
1258          * the pending socket.
1259          */
1260         listener->sk_data_ready(listener);
1261
1262         return 0;
1263
1264 destroy:
1265         pending->sk_err = skerr;
1266         pending->sk_state = TCP_CLOSE;
1267         /* As long as we drop our reference, all necessary cleanup will handle
1268          * when the cleanup function drops its reference and our destruct
1269          * implementation is called.  Note that since the listen handler will
1270          * remove pending from the pending list upon our failure, the cleanup
1271          * function won't drop the additional reference, which is why we do it
1272          * here.
1273          */
1274         sock_put(pending);
1275
1276         return err;
1277 }
1278
1279 static int
1280 vmci_transport_recv_connecting_client(struct sock *sk,
1281                                       struct vmci_transport_packet *pkt)
1282 {
1283         struct vsock_sock *vsk;
1284         int err;
1285         int skerr;
1286
1287         vsk = vsock_sk(sk);
1288
1289         switch (pkt->type) {
1290         case VMCI_TRANSPORT_PACKET_TYPE_ATTACH:
1291                 if (vmci_handle_is_invalid(pkt->u.handle) ||
1292                     !vmci_handle_is_equal(pkt->u.handle,
1293                                           vmci_trans(vsk)->qp_handle)) {
1294                         skerr = EPROTO;
1295                         err = -EINVAL;
1296                         goto destroy;
1297                 }
1298
1299                 /* Signify the socket is connected and wakeup the waiter in
1300                  * connect(). Also place the socket in the connected table for
1301                  * accounting (it can already be found since it's in the bound
1302                  * table).
1303                  */
1304                 sk->sk_state = TCP_ESTABLISHED;
1305                 sk->sk_socket->state = SS_CONNECTED;
1306                 vsock_insert_connected(vsk);
1307                 sk->sk_state_change(sk);
1308
1309                 break;
1310         case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE:
1311         case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2:
1312                 if (pkt->u.size == 0
1313                     || pkt->dg.src.context != vsk->remote_addr.svm_cid
1314                     || pkt->src_port != vsk->remote_addr.svm_port
1315                     || !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)
1316                     || vmci_trans(vsk)->qpair
1317                     || vmci_trans(vsk)->produce_size != 0
1318                     || vmci_trans(vsk)->consume_size != 0
1319                     || vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) {
1320                         skerr = EPROTO;
1321                         err = -EINVAL;
1322
1323                         goto destroy;
1324                 }
1325
1326                 err = vmci_transport_recv_connecting_client_negotiate(sk, pkt);
1327                 if (err) {
1328                         skerr = -err;
1329                         goto destroy;
1330                 }
1331
1332                 break;
1333         case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
1334                 err = vmci_transport_recv_connecting_client_invalid(sk, pkt);
1335                 if (err) {
1336                         skerr = -err;
1337                         goto destroy;
1338                 }
1339
1340                 break;
1341         case VMCI_TRANSPORT_PACKET_TYPE_RST:
1342                 /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to
1343                  * continue processing here after they sent an INVALID packet.
1344                  * This meant that we got a RST after the INVALID. We ignore a
1345                  * RST after an INVALID. The common code doesn't send the RST
1346                  * ... so we can hang if an old version of the common code
1347                  * fails between getting a REQUEST and sending an OFFER back.
1348                  * Not much we can do about it... except hope that it doesn't
1349                  * happen.
1350                  */
1351                 if (vsk->ignore_connecting_rst) {
1352                         vsk->ignore_connecting_rst = false;
1353                 } else {
1354                         skerr = ECONNRESET;
1355                         err = 0;
1356                         goto destroy;
1357                 }
1358
1359                 break;
1360         default:
1361                 /* Close and cleanup the connection. */
1362                 skerr = EPROTO;
1363                 err = -EINVAL;
1364                 goto destroy;
1365         }
1366
1367         return 0;
1368
1369 destroy:
1370         vmci_transport_send_reset(sk, pkt);
1371
1372         sk->sk_state = TCP_CLOSE;
1373         sk->sk_err = skerr;
1374         sk->sk_error_report(sk);
1375         return err;
1376 }
1377
1378 static int vmci_transport_recv_connecting_client_negotiate(
1379                                         struct sock *sk,
1380                                         struct vmci_transport_packet *pkt)
1381 {
1382         int err;
1383         struct vsock_sock *vsk;
1384         struct vmci_handle handle;
1385         struct vmci_qp *qpair;
1386         u32 detach_sub_id;
1387         bool is_local;
1388         u32 flags;
1389         bool old_proto = true;
1390         bool old_pkt_proto;
1391         u16 version;
1392
1393         vsk = vsock_sk(sk);
1394         handle = VMCI_INVALID_HANDLE;
1395         detach_sub_id = VMCI_INVALID_ID;
1396
1397         /* If we have gotten here then we should be past the point where old
1398          * linux vsock could have sent the bogus rst.
1399          */
1400         vsk->sent_request = false;
1401         vsk->ignore_connecting_rst = false;
1402
1403         /* Verify that we're OK with the proposed queue pair size */
1404         if (pkt->u.size < vmci_trans(vsk)->queue_pair_min_size ||
1405             pkt->u.size > vmci_trans(vsk)->queue_pair_max_size) {
1406                 err = -EINVAL;
1407                 goto destroy;
1408         }
1409
1410         /* At this point we know the CID the peer is using to talk to us. */
1411
1412         if (vsk->local_addr.svm_cid == VMADDR_CID_ANY)
1413                 vsk->local_addr.svm_cid = pkt->dg.dst.context;
1414
1415         /* Setup the notify ops to be the highest supported version that both
1416          * the server and the client support.
1417          */
1418
1419         if (vmci_transport_old_proto_override(&old_pkt_proto)) {
1420                 old_proto = old_pkt_proto;
1421         } else {
1422                 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE)
1423                         old_proto = true;
1424                 else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2)
1425                         old_proto = false;
1426
1427         }
1428
1429         if (old_proto)
1430                 version = VSOCK_PROTO_INVALID;
1431         else
1432                 version = pkt->proto;
1433
1434         if (!vmci_transport_proto_to_notify_struct(sk, &version, old_proto)) {
1435                 err = -EINVAL;
1436                 goto destroy;
1437         }
1438
1439         /* Subscribe to detach events first.
1440          *
1441          * XXX We attach once for each queue pair created for now so it is easy
1442          * to find the socket (it's provided), but later we should only
1443          * subscribe once and add a way to lookup sockets by queue pair handle.
1444          */
1445         err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH,
1446                                    vmci_transport_peer_detach_cb,
1447                                    vmci_trans(vsk), &detach_sub_id);
1448         if (err < VMCI_SUCCESS) {
1449                 err = vmci_transport_error_to_vsock_error(err);
1450                 goto destroy;
1451         }
1452
1453         /* Make VMCI select the handle for us. */
1454         handle = VMCI_INVALID_HANDLE;
1455         is_local = vsk->remote_addr.svm_cid == vsk->local_addr.svm_cid;
1456         flags = is_local ? VMCI_QPFLAG_LOCAL : 0;
1457
1458         err = vmci_transport_queue_pair_alloc(&qpair,
1459                                               &handle,
1460                                               pkt->u.size,
1461                                               pkt->u.size,
1462                                               vsk->remote_addr.svm_cid,
1463                                               flags,
1464                                               vmci_transport_is_trusted(
1465                                                   vsk,
1466                                                   vsk->
1467                                                   remote_addr.svm_cid));
1468         if (err < 0)
1469                 goto destroy;
1470
1471         err = vmci_transport_send_qp_offer(sk, handle);
1472         if (err < 0) {
1473                 err = vmci_transport_error_to_vsock_error(err);
1474                 goto destroy;
1475         }
1476
1477         vmci_trans(vsk)->qp_handle = handle;
1478         vmci_trans(vsk)->qpair = qpair;
1479
1480         vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size =
1481                 pkt->u.size;
1482
1483         vmci_trans(vsk)->detach_sub_id = detach_sub_id;
1484
1485         vmci_trans(vsk)->notify_ops->process_negotiate(sk);
1486
1487         return 0;
1488
1489 destroy:
1490         if (detach_sub_id != VMCI_INVALID_ID)
1491                 vmci_event_unsubscribe(detach_sub_id);
1492
1493         if (!vmci_handle_is_invalid(handle))
1494                 vmci_qpair_detach(&qpair);
1495
1496         return err;
1497 }
1498
1499 static int
1500 vmci_transport_recv_connecting_client_invalid(struct sock *sk,
1501                                               struct vmci_transport_packet *pkt)
1502 {
1503         int err = 0;
1504         struct vsock_sock *vsk = vsock_sk(sk);
1505
1506         if (vsk->sent_request) {
1507                 vsk->sent_request = false;
1508                 vsk->ignore_connecting_rst = true;
1509
1510                 err = vmci_transport_send_conn_request(
1511                         sk, vmci_trans(vsk)->queue_pair_size);
1512                 if (err < 0)
1513                         err = vmci_transport_error_to_vsock_error(err);
1514                 else
1515                         err = 0;
1516
1517         }
1518
1519         return err;
1520 }
1521
1522 static int vmci_transport_recv_connected(struct sock *sk,
1523                                          struct vmci_transport_packet *pkt)
1524 {
1525         struct vsock_sock *vsk;
1526         bool pkt_processed = false;
1527
1528         /* In cases where we are closing the connection, it's sufficient to
1529          * mark the state change (and maybe error) and wake up any waiting
1530          * threads. Since this is a connected socket, it's owned by a user
1531          * process and will be cleaned up when the failure is passed back on
1532          * the current or next system call.  Our system call implementations
1533          * must therefore check for error and state changes on entry and when
1534          * being awoken.
1535          */
1536         switch (pkt->type) {
1537         case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN:
1538                 if (pkt->u.mode) {
1539                         vsk = vsock_sk(sk);
1540
1541                         vsk->peer_shutdown |= pkt->u.mode;
1542                         sk->sk_state_change(sk);
1543                 }
1544                 break;
1545
1546         case VMCI_TRANSPORT_PACKET_TYPE_RST:
1547                 vsk = vsock_sk(sk);
1548                 /* It is possible that we sent our peer a message (e.g a
1549                  * WAITING_READ) right before we got notified that the peer had
1550                  * detached. If that happens then we can get a RST pkt back
1551                  * from our peer even though there is data available for us to
1552                  * read. In that case, don't shutdown the socket completely but
1553                  * instead allow the local client to finish reading data off
1554                  * the queuepair. Always treat a RST pkt in connected mode like
1555                  * a clean shutdown.
1556                  */
1557                 sock_set_flag(sk, SOCK_DONE);
1558                 vsk->peer_shutdown = SHUTDOWN_MASK;
1559                 if (vsock_stream_has_data(vsk) <= 0)
1560                         sk->sk_state = TCP_CLOSING;
1561
1562                 sk->sk_state_change(sk);
1563                 break;
1564
1565         default:
1566                 vsk = vsock_sk(sk);
1567                 vmci_trans(vsk)->notify_ops->handle_notify_pkt(
1568                                 sk, pkt, false, NULL, NULL,
1569                                 &pkt_processed);
1570                 if (!pkt_processed)
1571                         return -EINVAL;
1572
1573                 break;
1574         }
1575
1576         return 0;
1577 }
1578
1579 static int vmci_transport_socket_init(struct vsock_sock *vsk,
1580                                       struct vsock_sock *psk)
1581 {
1582         vsk->trans = kmalloc(sizeof(struct vmci_transport), GFP_KERNEL);
1583         if (!vsk->trans)
1584                 return -ENOMEM;
1585
1586         vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE;
1587         vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE;
1588         vmci_trans(vsk)->qpair = NULL;
1589         vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 0;
1590         vmci_trans(vsk)->detach_sub_id = VMCI_INVALID_ID;
1591         vmci_trans(vsk)->notify_ops = NULL;
1592         INIT_LIST_HEAD(&vmci_trans(vsk)->elem);
1593         vmci_trans(vsk)->sk = &vsk->sk;
1594         spin_lock_init(&vmci_trans(vsk)->lock);
1595         if (psk) {
1596                 vmci_trans(vsk)->queue_pair_size =
1597                         vmci_trans(psk)->queue_pair_size;
1598                 vmci_trans(vsk)->queue_pair_min_size =
1599                         vmci_trans(psk)->queue_pair_min_size;
1600                 vmci_trans(vsk)->queue_pair_max_size =
1601                         vmci_trans(psk)->queue_pair_max_size;
1602         } else {
1603                 vmci_trans(vsk)->queue_pair_size =
1604                         VMCI_TRANSPORT_DEFAULT_QP_SIZE;
1605                 vmci_trans(vsk)->queue_pair_min_size =
1606                          VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN;
1607                 vmci_trans(vsk)->queue_pair_max_size =
1608                         VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX;
1609         }
1610
1611         return 0;
1612 }
1613
1614 static void vmci_transport_free_resources(struct list_head *transport_list)
1615 {
1616         while (!list_empty(transport_list)) {
1617                 struct vmci_transport *transport =
1618                     list_first_entry(transport_list, struct vmci_transport,
1619                                      elem);
1620                 list_del(&transport->elem);
1621
1622                 if (transport->detach_sub_id != VMCI_INVALID_ID) {
1623                         vmci_event_unsubscribe(transport->detach_sub_id);
1624                         transport->detach_sub_id = VMCI_INVALID_ID;
1625                 }
1626
1627                 if (!vmci_handle_is_invalid(transport->qp_handle)) {
1628                         vmci_qpair_detach(&transport->qpair);
1629                         transport->qp_handle = VMCI_INVALID_HANDLE;
1630                         transport->produce_size = 0;
1631                         transport->consume_size = 0;
1632                 }
1633
1634                 kfree(transport);
1635         }
1636 }
1637
1638 static void vmci_transport_cleanup(struct work_struct *work)
1639 {
1640         LIST_HEAD(pending);
1641
1642         spin_lock_bh(&vmci_transport_cleanup_lock);
1643         list_replace_init(&vmci_transport_cleanup_list, &pending);
1644         spin_unlock_bh(&vmci_transport_cleanup_lock);
1645         vmci_transport_free_resources(&pending);
1646 }
1647
1648 static void vmci_transport_destruct(struct vsock_sock *vsk)
1649 {
1650         /* transport can be NULL if we hit a failure at init() time */
1651         if (!vmci_trans(vsk))
1652                 return;
1653
1654         /* Ensure that the detach callback doesn't use the sk/vsk
1655          * we are about to destruct.
1656          */
1657         spin_lock_bh(&vmci_trans(vsk)->lock);
1658         vmci_trans(vsk)->sk = NULL;
1659         spin_unlock_bh(&vmci_trans(vsk)->lock);
1660
1661         if (vmci_trans(vsk)->notify_ops)
1662                 vmci_trans(vsk)->notify_ops->socket_destruct(vsk);
1663
1664         spin_lock_bh(&vmci_transport_cleanup_lock);
1665         list_add(&vmci_trans(vsk)->elem, &vmci_transport_cleanup_list);
1666         spin_unlock_bh(&vmci_transport_cleanup_lock);
1667         schedule_work(&vmci_transport_cleanup_work);
1668
1669         vsk->trans = NULL;
1670 }
1671
1672 static void vmci_transport_release(struct vsock_sock *vsk)
1673 {
1674         vsock_remove_sock(vsk);
1675
1676         if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) {
1677                 vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle);
1678                 vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE;
1679         }
1680 }
1681
1682 static int vmci_transport_dgram_bind(struct vsock_sock *vsk,
1683                                      struct sockaddr_vm *addr)
1684 {
1685         u32 port;
1686         u32 flags;
1687         int err;
1688
1689         /* VMCI will select a resource ID for us if we provide
1690          * VMCI_INVALID_ID.
1691          */
1692         port = addr->svm_port == VMADDR_PORT_ANY ?
1693                         VMCI_INVALID_ID : addr->svm_port;
1694
1695         if (port <= LAST_RESERVED_PORT && !capable(CAP_NET_BIND_SERVICE))
1696                 return -EACCES;
1697
1698         flags = addr->svm_cid == VMADDR_CID_ANY ?
1699                                 VMCI_FLAG_ANYCID_DG_HND : 0;
1700
1701         err = vmci_transport_datagram_create_hnd(port, flags,
1702                                                  vmci_transport_recv_dgram_cb,
1703                                                  &vsk->sk,
1704                                                  &vmci_trans(vsk)->dg_handle);
1705         if (err < VMCI_SUCCESS)
1706                 return vmci_transport_error_to_vsock_error(err);
1707         vsock_addr_init(&vsk->local_addr, addr->svm_cid,
1708                         vmci_trans(vsk)->dg_handle.resource);
1709
1710         return 0;
1711 }
1712
1713 static int vmci_transport_dgram_enqueue(
1714         struct vsock_sock *vsk,
1715         struct sockaddr_vm *remote_addr,
1716         struct msghdr *msg,
1717         size_t len)
1718 {
1719         int err;
1720         struct vmci_datagram *dg;
1721
1722         if (len > VMCI_MAX_DG_PAYLOAD_SIZE)
1723                 return -EMSGSIZE;
1724
1725         if (!vmci_transport_allow_dgram(vsk, remote_addr->svm_cid))
1726                 return -EPERM;
1727
1728         /* Allocate a buffer for the user's message and our packet header. */
1729         dg = kmalloc(len + sizeof(*dg), GFP_KERNEL);
1730         if (!dg)
1731                 return -ENOMEM;
1732
1733         err = memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len);
1734         if (err) {
1735                 kfree(dg);
1736                 return err;
1737         }
1738
1739         dg->dst = vmci_make_handle(remote_addr->svm_cid,
1740                                    remote_addr->svm_port);
1741         dg->src = vmci_make_handle(vsk->local_addr.svm_cid,
1742                                    vsk->local_addr.svm_port);
1743         dg->payload_size = len;
1744
1745         err = vmci_datagram_send(dg);
1746         kfree(dg);
1747         if (err < 0)
1748                 return vmci_transport_error_to_vsock_error(err);
1749
1750         return err - sizeof(*dg);
1751 }
1752
1753 static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk,
1754                                         struct msghdr *msg, size_t len,
1755                                         int flags)
1756 {
1757         int err;
1758         int noblock;
1759         struct vmci_datagram *dg;
1760         size_t payload_len;
1761         struct sk_buff *skb;
1762
1763         noblock = flags & MSG_DONTWAIT;
1764
1765         if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
1766                 return -EOPNOTSUPP;
1767
1768         /* Retrieve the head sk_buff from the socket's receive queue. */
1769         err = 0;
1770         skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err);
1771         if (!skb)
1772                 return err;
1773
1774         dg = (struct vmci_datagram *)skb->data;
1775         if (!dg)
1776                 /* err is 0, meaning we read zero bytes. */
1777                 goto out;
1778
1779         payload_len = dg->payload_size;
1780         /* Ensure the sk_buff matches the payload size claimed in the packet. */
1781         if (payload_len != skb->len - sizeof(*dg)) {
1782                 err = -EINVAL;
1783                 goto out;
1784         }
1785
1786         if (payload_len > len) {
1787                 payload_len = len;
1788                 msg->msg_flags |= MSG_TRUNC;
1789         }
1790
1791         /* Place the datagram payload in the user's iovec. */
1792         err = skb_copy_datagram_msg(skb, sizeof(*dg), msg, payload_len);
1793         if (err)
1794                 goto out;
1795
1796         if (msg->msg_name) {
1797                 /* Provide the address of the sender. */
1798                 DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name);
1799                 vsock_addr_init(vm_addr, dg->src.context, dg->src.resource);
1800                 msg->msg_namelen = sizeof(*vm_addr);
1801         }
1802         err = payload_len;
1803
1804 out:
1805         skb_free_datagram(&vsk->sk, skb);
1806         return err;
1807 }
1808
1809 static bool vmci_transport_dgram_allow(u32 cid, u32 port)
1810 {
1811         if (cid == VMADDR_CID_HYPERVISOR) {
1812                 /* Registrations of PBRPC Servers do not modify VMX/Hypervisor
1813                  * state and are allowed.
1814                  */
1815                 return port == VMCI_UNITY_PBRPC_REGISTER;
1816         }
1817
1818         return true;
1819 }
1820
1821 static int vmci_transport_connect(struct vsock_sock *vsk)
1822 {
1823         int err;
1824         bool old_pkt_proto = false;
1825         struct sock *sk = &vsk->sk;
1826
1827         if (vmci_transport_old_proto_override(&old_pkt_proto) &&
1828                 old_pkt_proto) {
1829                 err = vmci_transport_send_conn_request(
1830                         sk, vmci_trans(vsk)->queue_pair_size);
1831                 if (err < 0) {
1832                         sk->sk_state = TCP_CLOSE;
1833                         return err;
1834                 }
1835         } else {
1836                 int supported_proto_versions =
1837                         vmci_transport_new_proto_supported_versions();
1838                 err = vmci_transport_send_conn_request2(
1839                                 sk, vmci_trans(vsk)->queue_pair_size,
1840                                 supported_proto_versions);
1841                 if (err < 0) {
1842                         sk->sk_state = TCP_CLOSE;
1843                         return err;
1844                 }
1845
1846                 vsk->sent_request = true;
1847         }
1848
1849         return err;
1850 }
1851
1852 static ssize_t vmci_transport_stream_dequeue(
1853         struct vsock_sock *vsk,
1854         struct msghdr *msg,
1855         size_t len,
1856         int flags)
1857 {
1858         if (flags & MSG_PEEK)
1859                 return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
1860         else
1861                 return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
1862 }
1863
1864 static ssize_t vmci_transport_stream_enqueue(
1865         struct vsock_sock *vsk,
1866         struct msghdr *msg,
1867         size_t len)
1868 {
1869         return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
1870 }
1871
1872 static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk)
1873 {
1874         return vmci_qpair_consume_buf_ready(vmci_trans(vsk)->qpair);
1875 }
1876
1877 static s64 vmci_transport_stream_has_space(struct vsock_sock *vsk)
1878 {
1879         return vmci_qpair_produce_free_space(vmci_trans(vsk)->qpair);
1880 }
1881
1882 static u64 vmci_transport_stream_rcvhiwat(struct vsock_sock *vsk)
1883 {
1884         return vmci_trans(vsk)->consume_size;
1885 }
1886
1887 static bool vmci_transport_stream_is_active(struct vsock_sock *vsk)
1888 {
1889         return !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle);
1890 }
1891
1892 static u64 vmci_transport_get_buffer_size(struct vsock_sock *vsk)
1893 {
1894         return vmci_trans(vsk)->queue_pair_size;
1895 }
1896
1897 static u64 vmci_transport_get_min_buffer_size(struct vsock_sock *vsk)
1898 {
1899         return vmci_trans(vsk)->queue_pair_min_size;
1900 }
1901
1902 static u64 vmci_transport_get_max_buffer_size(struct vsock_sock *vsk)
1903 {
1904         return vmci_trans(vsk)->queue_pair_max_size;
1905 }
1906
1907 static void vmci_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
1908 {
1909         if (val < vmci_trans(vsk)->queue_pair_min_size)
1910                 vmci_trans(vsk)->queue_pair_min_size = val;
1911         if (val > vmci_trans(vsk)->queue_pair_max_size)
1912                 vmci_trans(vsk)->queue_pair_max_size = val;
1913         vmci_trans(vsk)->queue_pair_size = val;
1914 }
1915
1916 static void vmci_transport_set_min_buffer_size(struct vsock_sock *vsk,
1917                                                u64 val)
1918 {
1919         if (val > vmci_trans(vsk)->queue_pair_size)
1920                 vmci_trans(vsk)->queue_pair_size = val;
1921         vmci_trans(vsk)->queue_pair_min_size = val;
1922 }
1923
1924 static void vmci_transport_set_max_buffer_size(struct vsock_sock *vsk,
1925                                                u64 val)
1926 {
1927         if (val < vmci_trans(vsk)->queue_pair_size)
1928                 vmci_trans(vsk)->queue_pair_size = val;
1929         vmci_trans(vsk)->queue_pair_max_size = val;
1930 }
1931
1932 static int vmci_transport_notify_poll_in(
1933         struct vsock_sock *vsk,
1934         size_t target,
1935         bool *data_ready_now)
1936 {
1937         return vmci_trans(vsk)->notify_ops->poll_in(
1938                         &vsk->sk, target, data_ready_now);
1939 }
1940
1941 static int vmci_transport_notify_poll_out(
1942         struct vsock_sock *vsk,
1943         size_t target,
1944         bool *space_available_now)
1945 {
1946         return vmci_trans(vsk)->notify_ops->poll_out(
1947                         &vsk->sk, target, space_available_now);
1948 }
1949
1950 static int vmci_transport_notify_recv_init(
1951         struct vsock_sock *vsk,
1952         size_t target,
1953         struct vsock_transport_recv_notify_data *data)
1954 {
1955         return vmci_trans(vsk)->notify_ops->recv_init(
1956                         &vsk->sk, target,
1957                         (struct vmci_transport_recv_notify_data *)data);
1958 }
1959
1960 static int vmci_transport_notify_recv_pre_block(
1961         struct vsock_sock *vsk,
1962         size_t target,
1963         struct vsock_transport_recv_notify_data *data)
1964 {
1965         return vmci_trans(vsk)->notify_ops->recv_pre_block(
1966                         &vsk->sk, target,
1967                         (struct vmci_transport_recv_notify_data *)data);
1968 }
1969
1970 static int vmci_transport_notify_recv_pre_dequeue(
1971         struct vsock_sock *vsk,
1972         size_t target,
1973         struct vsock_transport_recv_notify_data *data)
1974 {
1975         return vmci_trans(vsk)->notify_ops->recv_pre_dequeue(
1976                         &vsk->sk, target,
1977                         (struct vmci_transport_recv_notify_data *)data);
1978 }
1979
1980 static int vmci_transport_notify_recv_post_dequeue(
1981         struct vsock_sock *vsk,
1982         size_t target,
1983         ssize_t copied,
1984         bool data_read,
1985         struct vsock_transport_recv_notify_data *data)
1986 {
1987         return vmci_trans(vsk)->notify_ops->recv_post_dequeue(
1988                         &vsk->sk, target, copied, data_read,
1989                         (struct vmci_transport_recv_notify_data *)data);
1990 }
1991
1992 static int vmci_transport_notify_send_init(
1993         struct vsock_sock *vsk,
1994         struct vsock_transport_send_notify_data *data)
1995 {
1996         return vmci_trans(vsk)->notify_ops->send_init(
1997                         &vsk->sk,
1998                         (struct vmci_transport_send_notify_data *)data);
1999 }
2000
2001 static int vmci_transport_notify_send_pre_block(
2002         struct vsock_sock *vsk,
2003         struct vsock_transport_send_notify_data *data)
2004 {
2005         return vmci_trans(vsk)->notify_ops->send_pre_block(
2006                         &vsk->sk,
2007                         (struct vmci_transport_send_notify_data *)data);
2008 }
2009
2010 static int vmci_transport_notify_send_pre_enqueue(
2011         struct vsock_sock *vsk,
2012         struct vsock_transport_send_notify_data *data)
2013 {
2014         return vmci_trans(vsk)->notify_ops->send_pre_enqueue(
2015                         &vsk->sk,
2016                         (struct vmci_transport_send_notify_data *)data);
2017 }
2018
2019 static int vmci_transport_notify_send_post_enqueue(
2020         struct vsock_sock *vsk,
2021         ssize_t written,
2022         struct vsock_transport_send_notify_data *data)
2023 {
2024         return vmci_trans(vsk)->notify_ops->send_post_enqueue(
2025                         &vsk->sk, written,
2026                         (struct vmci_transport_send_notify_data *)data);
2027 }
2028
2029 static bool vmci_transport_old_proto_override(bool *old_pkt_proto)
2030 {
2031         if (PROTOCOL_OVERRIDE != -1) {
2032                 if (PROTOCOL_OVERRIDE == 0)
2033                         *old_pkt_proto = true;
2034                 else
2035                         *old_pkt_proto = false;
2036
2037                 pr_info("Proto override in use\n");
2038                 return true;
2039         }
2040
2041         return false;
2042 }
2043
2044 static bool vmci_transport_proto_to_notify_struct(struct sock *sk,
2045                                                   u16 *proto,
2046                                                   bool old_pkt_proto)
2047 {
2048         struct vsock_sock *vsk = vsock_sk(sk);
2049
2050         if (old_pkt_proto) {
2051                 if (*proto != VSOCK_PROTO_INVALID) {
2052                         pr_err("Can't set both an old and new protocol\n");
2053                         return false;
2054                 }
2055                 vmci_trans(vsk)->notify_ops = &vmci_transport_notify_pkt_ops;
2056                 goto exit;
2057         }
2058
2059         switch (*proto) {
2060         case VSOCK_PROTO_PKT_ON_NOTIFY:
2061                 vmci_trans(vsk)->notify_ops =
2062                         &vmci_transport_notify_pkt_q_state_ops;
2063                 break;
2064         default:
2065                 pr_err("Unknown notify protocol version\n");
2066                 return false;
2067         }
2068
2069 exit:
2070         vmci_trans(vsk)->notify_ops->socket_init(sk);
2071         return true;
2072 }
2073
2074 static u16 vmci_transport_new_proto_supported_versions(void)
2075 {
2076         if (PROTOCOL_OVERRIDE != -1)
2077                 return PROTOCOL_OVERRIDE;
2078
2079         return VSOCK_PROTO_ALL_SUPPORTED;
2080 }
2081
2082 static u32 vmci_transport_get_local_cid(void)
2083 {
2084         return vmci_get_context_id();
2085 }
2086
2087 static const struct vsock_transport vmci_transport = {
2088         .init = vmci_transport_socket_init,
2089         .destruct = vmci_transport_destruct,
2090         .release = vmci_transport_release,
2091         .connect = vmci_transport_connect,
2092         .dgram_bind = vmci_transport_dgram_bind,
2093         .dgram_dequeue = vmci_transport_dgram_dequeue,
2094         .dgram_enqueue = vmci_transport_dgram_enqueue,
2095         .dgram_allow = vmci_transport_dgram_allow,
2096         .stream_dequeue = vmci_transport_stream_dequeue,
2097         .stream_enqueue = vmci_transport_stream_enqueue,
2098         .stream_has_data = vmci_transport_stream_has_data,
2099         .stream_has_space = vmci_transport_stream_has_space,
2100         .stream_rcvhiwat = vmci_transport_stream_rcvhiwat,
2101         .stream_is_active = vmci_transport_stream_is_active,
2102         .stream_allow = vmci_transport_stream_allow,
2103         .notify_poll_in = vmci_transport_notify_poll_in,
2104         .notify_poll_out = vmci_transport_notify_poll_out,
2105         .notify_recv_init = vmci_transport_notify_recv_init,
2106         .notify_recv_pre_block = vmci_transport_notify_recv_pre_block,
2107         .notify_recv_pre_dequeue = vmci_transport_notify_recv_pre_dequeue,
2108         .notify_recv_post_dequeue = vmci_transport_notify_recv_post_dequeue,
2109         .notify_send_init = vmci_transport_notify_send_init,
2110         .notify_send_pre_block = vmci_transport_notify_send_pre_block,
2111         .notify_send_pre_enqueue = vmci_transport_notify_send_pre_enqueue,
2112         .notify_send_post_enqueue = vmci_transport_notify_send_post_enqueue,
2113         .shutdown = vmci_transport_shutdown,
2114         .set_buffer_size = vmci_transport_set_buffer_size,
2115         .set_min_buffer_size = vmci_transport_set_min_buffer_size,
2116         .set_max_buffer_size = vmci_transport_set_max_buffer_size,
2117         .get_buffer_size = vmci_transport_get_buffer_size,
2118         .get_min_buffer_size = vmci_transport_get_min_buffer_size,
2119         .get_max_buffer_size = vmci_transport_get_max_buffer_size,
2120         .get_local_cid = vmci_transport_get_local_cid,
2121 };
2122
2123 static int __init vmci_transport_init(void)
2124 {
2125         int err;
2126
2127         /* Create the datagram handle that we will use to send and receive all
2128          * VSocket control messages for this context.
2129          */
2130         err = vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID,
2131                                                  VMCI_FLAG_ANYCID_DG_HND,
2132                                                  vmci_transport_recv_stream_cb,
2133                                                  NULL,
2134                                                  &vmci_transport_stream_handle);
2135         if (err < VMCI_SUCCESS) {
2136                 pr_err("Unable to create datagram handle. (%d)\n", err);
2137                 return vmci_transport_error_to_vsock_error(err);
2138         }
2139
2140         err = vmci_event_subscribe(VMCI_EVENT_QP_RESUMED,
2141                                    vmci_transport_qp_resumed_cb,
2142                                    NULL, &vmci_transport_qp_resumed_sub_id);
2143         if (err < VMCI_SUCCESS) {
2144                 pr_err("Unable to subscribe to resumed event. (%d)\n", err);
2145                 err = vmci_transport_error_to_vsock_error(err);
2146                 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
2147                 goto err_destroy_stream_handle;
2148         }
2149
2150         err = vsock_core_init(&vmci_transport);
2151         if (err < 0)
2152                 goto err_unsubscribe;
2153
2154         return 0;
2155
2156 err_unsubscribe:
2157         vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id);
2158 err_destroy_stream_handle:
2159         vmci_datagram_destroy_handle(vmci_transport_stream_handle);
2160         return err;
2161 }
2162 module_init(vmci_transport_init);
2163
2164 static void __exit vmci_transport_exit(void)
2165 {
2166         cancel_work_sync(&vmci_transport_cleanup_work);
2167         vmci_transport_free_resources(&vmci_transport_cleanup_list);
2168
2169         if (!vmci_handle_is_invalid(vmci_transport_stream_handle)) {
2170                 if (vmci_datagram_destroy_handle(
2171                         vmci_transport_stream_handle) != VMCI_SUCCESS)
2172                         pr_err("Couldn't destroy datagram handle\n");
2173                 vmci_transport_stream_handle = VMCI_INVALID_HANDLE;
2174         }
2175
2176         if (vmci_transport_qp_resumed_sub_id != VMCI_INVALID_ID) {
2177                 vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id);
2178                 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
2179         }
2180
2181         vsock_core_exit();
2182 }
2183 module_exit(vmci_transport_exit);
2184
2185 MODULE_AUTHOR("VMware, Inc.");
2186 MODULE_DESCRIPTION("VMCI transport for Virtual Sockets");
2187 MODULE_VERSION("1.0.4.0-k");
2188 MODULE_LICENSE("GPL v2");
2189 MODULE_ALIAS("vmware_vsock");
2190 MODULE_ALIAS_NETPROTO(PF_VSOCK);