1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * VMware vSockets Driver 4 * 5 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. 6 */ 7 8#include <linux/types.h> 9#include <linux/bitops.h> 10#include <linux/cred.h> 11#include <linux/init.h> 12#include <linux/io.h> 13#include <linux/kernel.h> 14#include <linux/kmod.h> 15#include <linux/list.h> 16#include <linux/module.h> 17#include <linux/mutex.h> 18#include <linux/net.h> 19#include <linux/poll.h> 20#include <linux/skbuff.h> 21#include <linux/smp.h> 22#include <linux/socket.h> 23#include <linux/stddef.h> 24#include <linux/unistd.h> 25#include <linux/wait.h> 26#include <linux/workqueue.h> 27#include <net/sock.h> 28#include <net/af_vsock.h> 29 30#include "vmci_transport_notify.h" 31 32static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg); 33static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg); 34static void vmci_transport_peer_detach_cb(u32 sub_id, 35 const struct vmci_event_data *ed, 36 void *client_data); 37static void vmci_transport_recv_pkt_work(struct work_struct *work); 38static void vmci_transport_cleanup(struct work_struct *work); 39static int vmci_transport_recv_listen(struct sock *sk, 40 struct vmci_transport_packet *pkt); 41static int vmci_transport_recv_connecting_server( 42 struct sock *sk, 43 struct sock *pending, 44 struct vmci_transport_packet *pkt); 45static int vmci_transport_recv_connecting_client( 46 struct sock *sk, 47 struct vmci_transport_packet *pkt); 48static int vmci_transport_recv_connecting_client_negotiate( 49 struct sock *sk, 50 struct vmci_transport_packet *pkt); 51static int vmci_transport_recv_connecting_client_invalid( 52 struct sock *sk, 53 struct vmci_transport_packet *pkt); 54static int vmci_transport_recv_connected(struct sock *sk, 55 struct vmci_transport_packet *pkt); 56static bool vmci_transport_old_proto_override(bool *old_pkt_proto); 57static u16 vmci_transport_new_proto_supported_versions(void); 58static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto, 59 bool old_pkt_proto); 60static bool vmci_check_transport(struct vsock_sock *vsk); 61 62struct vmci_transport_recv_pkt_info { 63 struct work_struct work; 64 struct sock *sk; 65 struct vmci_transport_packet pkt; 66}; 67 68static LIST_HEAD(vmci_transport_cleanup_list); 69static DEFINE_SPINLOCK(vmci_transport_cleanup_lock); 70static DECLARE_WORK(vmci_transport_cleanup_work, vmci_transport_cleanup); 71 72static struct vmci_handle vmci_transport_stream_handle = { VMCI_INVALID_ID, 73 VMCI_INVALID_ID }; 74static u32 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; 75 76static int PROTOCOL_OVERRIDE = -1; 77 78static struct vsock_transport vmci_transport; /* forward declaration */ 79 80/* Helper function to convert from a VMCI error code to a VSock error code. */ 81 82static s32 vmci_transport_error_to_vsock_error(s32 vmci_error) 83{ 84 switch (vmci_error) { 85 case VMCI_ERROR_NO_MEM: 86 return -ENOMEM; 87 case VMCI_ERROR_DUPLICATE_ENTRY: 88 case VMCI_ERROR_ALREADY_EXISTS: 89 return -EADDRINUSE; 90 case VMCI_ERROR_NO_ACCESS: 91 return -EPERM; 92 case VMCI_ERROR_NO_RESOURCES: 93 return -ENOBUFS; 94 case VMCI_ERROR_INVALID_RESOURCE: 95 return -EHOSTUNREACH; 96 case VMCI_ERROR_INVALID_ARGS: 97 default: 98 break; 99 } 100 return -EINVAL; 101} 102 103static u32 vmci_transport_peer_rid(u32 peer_cid) 104{ 105 if (VMADDR_CID_HYPERVISOR == peer_cid) 106 return VMCI_TRANSPORT_HYPERVISOR_PACKET_RID; 107 108 return VMCI_TRANSPORT_PACKET_RID; 109} 110 111static inline void 112vmci_transport_packet_init(struct vmci_transport_packet *pkt, 113 struct sockaddr_vm *src, 114 struct sockaddr_vm *dst, 115 u8 type, 116 u64 size, 117 u64 mode, 118 struct vmci_transport_waiting_info *wait, 119 u16 proto, 120 struct vmci_handle handle) 121{ 122 /* We register the stream control handler as an any cid handle so we 123 * must always send from a source address of VMADDR_CID_ANY 124 */ 125 pkt->dg.src = vmci_make_handle(VMADDR_CID_ANY, 126 VMCI_TRANSPORT_PACKET_RID); 127 pkt->dg.dst = vmci_make_handle(dst->svm_cid, 128 vmci_transport_peer_rid(dst->svm_cid)); 129 pkt->dg.payload_size = sizeof(*pkt) - sizeof(pkt->dg); 130 pkt->version = VMCI_TRANSPORT_PACKET_VERSION; 131 pkt->type = type; 132 pkt->src_port = src->svm_port; 133 pkt->dst_port = dst->svm_port; 134 memset(&pkt->proto, 0, sizeof(pkt->proto)); 135 memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2)); 136 137 switch (pkt->type) { 138 case VMCI_TRANSPORT_PACKET_TYPE_INVALID: 139 pkt->u.size = 0; 140 break; 141 142 case VMCI_TRANSPORT_PACKET_TYPE_REQUEST: 143 case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: 144 pkt->u.size = size; 145 break; 146 147 case VMCI_TRANSPORT_PACKET_TYPE_OFFER: 148 case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: 149 pkt->u.handle = handle; 150 break; 151 152 case VMCI_TRANSPORT_PACKET_TYPE_WROTE: 153 case VMCI_TRANSPORT_PACKET_TYPE_READ: 154 case VMCI_TRANSPORT_PACKET_TYPE_RST: 155 pkt->u.size = 0; 156 break; 157 158 case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: 159 pkt->u.mode = mode; 160 break; 161 162 case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ: 163 case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE: 164 memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait)); 165 break; 166 167 case VMCI_TRANSPORT_PACKET_TYPE_REQUEST2: 168 case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: 169 pkt->u.size = size; 170 pkt->proto = proto; 171 break; 172 } 173} 174 175static inline void 176vmci_transport_packet_get_addresses(struct vmci_transport_packet *pkt, 177 struct sockaddr_vm *local, 178 struct sockaddr_vm *remote) 179{ 180 vsock_addr_init(local, pkt->dg.dst.context, pkt->dst_port); 181 vsock_addr_init(remote, pkt->dg.src.context, pkt->src_port); 182} 183 184static int 185__vmci_transport_send_control_pkt(struct vmci_transport_packet *pkt, 186 struct sockaddr_vm *src, 187 struct sockaddr_vm *dst, 188 enum vmci_transport_packet_type type, 189 u64 size, 190 u64 mode, 191 struct vmci_transport_waiting_info *wait, 192 u16 proto, 193 struct vmci_handle handle, 194 bool convert_error) 195{ 196 int err; 197 198 vmci_transport_packet_init(pkt, src, dst, type, size, mode, wait, 199 proto, handle); 200 err = vmci_datagram_send(&pkt->dg); 201 if (convert_error && (err < 0)) 202 return vmci_transport_error_to_vsock_error(err); 203 204 return err; 205} 206 207static int 208vmci_transport_reply_control_pkt_fast(struct vmci_transport_packet *pkt, 209 enum vmci_transport_packet_type type, 210 u64 size, 211 u64 mode, 212 struct vmci_transport_waiting_info *wait, 213 struct vmci_handle handle) 214{ 215 struct vmci_transport_packet reply; 216 struct sockaddr_vm src, dst; 217 218 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) { 219 return 0; 220 } else { 221 vmci_transport_packet_get_addresses(pkt, &src, &dst); 222 return __vmci_transport_send_control_pkt(&reply, &src, &dst, 223 type, 224 size, mode, wait, 225 VSOCK_PROTO_INVALID, 226 handle, true); 227 } 228} 229 230static int 231vmci_transport_send_control_pkt_bh(struct sockaddr_vm *src, 232 struct sockaddr_vm *dst, 233 enum vmci_transport_packet_type type, 234 u64 size, 235 u64 mode, 236 struct vmci_transport_waiting_info *wait, 237 struct vmci_handle handle) 238{ 239 /* Note that it is safe to use a single packet across all CPUs since 240 * two tasklets of the same type are guaranteed to not ever run 241 * simultaneously. If that ever changes, or VMCI stops using tasklets, 242 * we can use per-cpu packets. 243 */ 244 static struct vmci_transport_packet pkt; 245 246 return __vmci_transport_send_control_pkt(&pkt, src, dst, type, 247 size, mode, wait, 248 VSOCK_PROTO_INVALID, handle, 249 false); 250} 251 252static int 253vmci_transport_alloc_send_control_pkt(struct sockaddr_vm *src, 254 struct sockaddr_vm *dst, 255 enum vmci_transport_packet_type type, 256 u64 size, 257 u64 mode, 258 struct vmci_transport_waiting_info *wait, 259 u16 proto, 260 struct vmci_handle handle) 261{ 262 struct vmci_transport_packet *pkt; 263 int err; 264 265 pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); 266 if (!pkt) 267 return -ENOMEM; 268 269 err = __vmci_transport_send_control_pkt(pkt, src, dst, type, size, 270 mode, wait, proto, handle, 271 true); 272 kfree(pkt); 273 274 return err; 275} 276 277static int 278vmci_transport_send_control_pkt(struct sock *sk, 279 enum vmci_transport_packet_type type, 280 u64 size, 281 u64 mode, 282 struct vmci_transport_waiting_info *wait, 283 u16 proto, 284 struct vmci_handle handle) 285{ 286 struct vsock_sock *vsk; 287 288 vsk = vsock_sk(sk); 289 290 if (!vsock_addr_bound(&vsk->local_addr)) 291 return -EINVAL; 292 293 if (!vsock_addr_bound(&vsk->remote_addr)) 294 return -EINVAL; 295 296 return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, 297 &vsk->remote_addr, 298 type, size, mode, 299 wait, proto, handle); 300} 301 302static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst, 303 struct sockaddr_vm *src, 304 struct vmci_transport_packet *pkt) 305{ 306 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) 307 return 0; 308 return vmci_transport_send_control_pkt_bh( 309 dst, src, 310 VMCI_TRANSPORT_PACKET_TYPE_RST, 0, 311 0, NULL, VMCI_INVALID_HANDLE); 312} 313 314static int vmci_transport_send_reset(struct sock *sk, 315 struct vmci_transport_packet *pkt) 316{ 317 struct sockaddr_vm *dst_ptr; 318 struct sockaddr_vm dst; 319 struct vsock_sock *vsk; 320 321 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) 322 return 0; 323 324 vsk = vsock_sk(sk); 325 326 if (!vsock_addr_bound(&vsk->local_addr)) 327 return -EINVAL; 328 329 if (vsock_addr_bound(&vsk->remote_addr)) { 330 dst_ptr = &vsk->remote_addr; 331 } else { 332 vsock_addr_init(&dst, pkt->dg.src.context, 333 pkt->src_port); 334 dst_ptr = &dst; 335 } 336 return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, dst_ptr, 337 VMCI_TRANSPORT_PACKET_TYPE_RST, 338 0, 0, NULL, VSOCK_PROTO_INVALID, 339 VMCI_INVALID_HANDLE); 340} 341 342static int vmci_transport_send_negotiate(struct sock *sk, size_t size) 343{ 344 return vmci_transport_send_control_pkt( 345 sk, 346 VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE, 347 size, 0, NULL, 348 VSOCK_PROTO_INVALID, 349 VMCI_INVALID_HANDLE); 350} 351 352static int vmci_transport_send_negotiate2(struct sock *sk, size_t size, 353 u16 version) 354{ 355 return vmci_transport_send_control_pkt( 356 sk, 357 VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2, 358 size, 0, NULL, version, 359 VMCI_INVALID_HANDLE); 360} 361 362static int vmci_transport_send_qp_offer(struct sock *sk, 363 struct vmci_handle handle) 364{ 365 return vmci_transport_send_control_pkt( 366 sk, VMCI_TRANSPORT_PACKET_TYPE_OFFER, 0, 367 0, NULL, 368 VSOCK_PROTO_INVALID, handle); 369} 370 371static int vmci_transport_send_attach(struct sock *sk, 372 struct vmci_handle handle) 373{ 374 return vmci_transport_send_control_pkt( 375 sk, VMCI_TRANSPORT_PACKET_TYPE_ATTACH, 376 0, 0, NULL, VSOCK_PROTO_INVALID, 377 handle); 378} 379 380static int vmci_transport_reply_reset(struct vmci_transport_packet *pkt) 381{ 382 return vmci_transport_reply_control_pkt_fast( 383 pkt, 384 VMCI_TRANSPORT_PACKET_TYPE_RST, 385 0, 0, NULL, 386 VMCI_INVALID_HANDLE); 387} 388 389static int vmci_transport_send_invalid_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_INVALID, 395 0, 0, NULL, VMCI_INVALID_HANDLE); 396} 397 398int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst, 399 struct sockaddr_vm *src) 400{ 401 return vmci_transport_send_control_pkt_bh( 402 dst, src, 403 VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, 404 0, NULL, VMCI_INVALID_HANDLE); 405} 406 407int vmci_transport_send_read_bh(struct sockaddr_vm *dst, 408 struct sockaddr_vm *src) 409{ 410 return vmci_transport_send_control_pkt_bh( 411 dst, src, 412 VMCI_TRANSPORT_PACKET_TYPE_READ, 0, 413 0, NULL, VMCI_INVALID_HANDLE); 414} 415 416int vmci_transport_send_wrote(struct sock *sk) 417{ 418 return vmci_transport_send_control_pkt( 419 sk, VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, 420 0, NULL, VSOCK_PROTO_INVALID, 421 VMCI_INVALID_HANDLE); 422} 423 424int vmci_transport_send_read(struct sock *sk) 425{ 426 return vmci_transport_send_control_pkt( 427 sk, VMCI_TRANSPORT_PACKET_TYPE_READ, 0, 428 0, NULL, VSOCK_PROTO_INVALID, 429 VMCI_INVALID_HANDLE); 430} 431 432int vmci_transport_send_waiting_write(struct sock *sk, 433 struct vmci_transport_waiting_info *wait) 434{ 435 return vmci_transport_send_control_pkt( 436 sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE, 437 0, 0, wait, VSOCK_PROTO_INVALID, 438 VMCI_INVALID_HANDLE); 439} 440 441int vmci_transport_send_waiting_read(struct sock *sk, 442 struct vmci_transport_waiting_info *wait) 443{ 444 return vmci_transport_send_control_pkt( 445 sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ, 446 0, 0, wait, VSOCK_PROTO_INVALID, 447 VMCI_INVALID_HANDLE); 448} 449 450static int vmci_transport_shutdown(struct vsock_sock *vsk, int mode) 451{ 452 return vmci_transport_send_control_pkt( 453 &vsk->sk, 454 VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN, 455 0, mode, NULL, 456 VSOCK_PROTO_INVALID, 457 VMCI_INVALID_HANDLE); 458} 459 460static int vmci_transport_send_conn_request(struct sock *sk, size_t size) 461{ 462 return vmci_transport_send_control_pkt(sk, 463 VMCI_TRANSPORT_PACKET_TYPE_REQUEST, 464 size, 0, NULL, 465 VSOCK_PROTO_INVALID, 466 VMCI_INVALID_HANDLE); 467} 468 469static int vmci_transport_send_conn_request2(struct sock *sk, size_t size, 470 u16 version) 471{ 472 return vmci_transport_send_control_pkt( 473 sk, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2, 474 size, 0, NULL, version, 475 VMCI_INVALID_HANDLE); 476} 477 478static struct sock *vmci_transport_get_pending( 479 struct sock *listener, 480 struct vmci_transport_packet *pkt) 481{ 482 struct vsock_sock *vlistener; 483 struct vsock_sock *vpending; 484 struct sock *pending; 485 struct sockaddr_vm src; 486 487 vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); 488 489 vlistener = vsock_sk(listener); 490 491 list_for_each_entry(vpending, &vlistener->pending_links, 492 pending_links) { 493 if (vsock_addr_equals_addr(&src, &vpending->remote_addr) && 494 pkt->dst_port == vpending->local_addr.svm_port) { 495 pending = sk_vsock(vpending); 496 sock_hold(pending); 497 goto found; 498 } 499 } 500 501 pending = NULL; 502found: 503 return pending; 504 505} 506 507static void vmci_transport_release_pending(struct sock *pending) 508{ 509 sock_put(pending); 510} 511 512/* We allow two kinds of sockets to communicate with a restricted VM: 1) 513 * trusted sockets 2) sockets from applications running as the same user as the 514 * VM (this is only true for the host side and only when using hosted products) 515 */ 516 517static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid) 518{ 519 return vsock->trusted || 520 vmci_is_context_owner(peer_cid, vsock->owner->uid); 521} 522 523/* We allow sending datagrams to and receiving datagrams from a restricted VM 524 * only if it is trusted as described in vmci_transport_is_trusted. 525 */ 526 527static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid) 528{ 529 if (VMADDR_CID_HYPERVISOR == peer_cid) 530 return true; 531 532 if (vsock->cached_peer != peer_cid) { 533 vsock->cached_peer = peer_cid; 534 if (!vmci_transport_is_trusted(vsock, peer_cid) && 535 (vmci_context_get_priv_flags(peer_cid) & 536 VMCI_PRIVILEGE_FLAG_RESTRICTED)) { 537 vsock->cached_peer_allow_dgram = false; 538 } else { 539 vsock->cached_peer_allow_dgram = true; 540 } 541 } 542 543 return vsock->cached_peer_allow_dgram; 544} 545 546static int 547vmci_transport_queue_pair_alloc(struct vmci_qp **qpair, 548 struct vmci_handle *handle, 549 u64 produce_size, 550 u64 consume_size, 551 u32 peer, u32 flags, bool trusted) 552{ 553 int err = 0; 554 555 if (trusted) { 556 /* Try to allocate our queue pair as trusted. This will only 557 * work if vsock is running in the host. 558 */ 559 560 err = vmci_qpair_alloc(qpair, handle, produce_size, 561 consume_size, 562 peer, flags, 563 VMCI_PRIVILEGE_FLAG_TRUSTED); 564 if (err != VMCI_ERROR_NO_ACCESS) 565 goto out; 566 567 } 568 569 err = vmci_qpair_alloc(qpair, handle, produce_size, consume_size, 570 peer, flags, VMCI_NO_PRIVILEGE_FLAGS); 571out: 572 if (err < 0) { 573 pr_err_once("Could not attach to queue pair with %d\n", err); 574 err = vmci_transport_error_to_vsock_error(err); 575 } 576 577 return err; 578} 579 580static int 581vmci_transport_datagram_create_hnd(u32 resource_id, 582 u32 flags, 583 vmci_datagram_recv_cb recv_cb, 584 void *client_data, 585 struct vmci_handle *out_handle) 586{ 587 int err = 0; 588 589 /* Try to allocate our datagram handler as trusted. This will only work 590 * if vsock is running in the host. 591 */ 592 593 err = vmci_datagram_create_handle_priv(resource_id, flags, 594 VMCI_PRIVILEGE_FLAG_TRUSTED, 595 recv_cb, 596 client_data, out_handle); 597 598 if (err == VMCI_ERROR_NO_ACCESS) 599 err = vmci_datagram_create_handle(resource_id, flags, 600 recv_cb, client_data, 601 out_handle); 602 603 return err; 604} 605 606/* This is invoked as part of a tasklet that's scheduled when the VMCI 607 * interrupt fires. This is run in bottom-half context and if it ever needs to 608 * sleep it should defer that work to a work queue. 609 */ 610 611static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg) 612{ 613 struct sock *sk; 614 size_t size; 615 struct sk_buff *skb; 616 struct vsock_sock *vsk; 617 618 sk = (struct sock *)data; 619 620 /* This handler is privileged when this module is running on the host. 621 * We will get datagrams from all endpoints (even VMs that are in a 622 * restricted context). If we get one from a restricted context then 623 * the destination socket must be trusted. 624 * 625 * NOTE: We access the socket struct without holding the lock here. 626 * This is ok because the field we are interested is never modified 627 * outside of the create and destruct socket functions. 628 */ 629 vsk = vsock_sk(sk); 630 if (!vmci_transport_allow_dgram(vsk, dg->src.context)) 631 return VMCI_ERROR_NO_ACCESS; 632 633 size = VMCI_DG_SIZE(dg); 634 635 /* Attach the packet to the socket's receive queue as an sk_buff. */ 636 skb = alloc_skb(size, GFP_ATOMIC); 637 if (!skb) 638 return VMCI_ERROR_NO_MEM; 639 640 /* sk_receive_skb() will do a sock_put(), so hold here. */ 641 sock_hold(sk); 642 skb_put(skb, size); 643 memcpy(skb->data, dg, size); 644 sk_receive_skb(sk, skb, 0); 645 646 return VMCI_SUCCESS; 647} 648 649static bool vmci_transport_stream_allow(u32 cid, u32 port) 650{ 651 static const u32 non_socket_contexts[] = { 652 VMADDR_CID_LOCAL, 653 }; 654 int i; 655 656 BUILD_BUG_ON(sizeof(cid) != sizeof(*non_socket_contexts)); 657 658 for (i = 0; i < ARRAY_SIZE(non_socket_contexts); i++) { 659 if (cid == non_socket_contexts[i]) 660 return false; 661 } 662 663 return true; 664} 665 666/* This is invoked as part of a tasklet that's scheduled when the VMCI 667 * interrupt fires. This is run in bottom-half context but it defers most of 668 * its work to the packet handling work queue. 669 */ 670 671static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg) 672{ 673 struct sock *sk; 674 struct sockaddr_vm dst; 675 struct sockaddr_vm src; 676 struct vmci_transport_packet *pkt; 677 struct vsock_sock *vsk; 678 bool bh_process_pkt; 679 int err; 680 681 sk = NULL; 682 err = VMCI_SUCCESS; 683 bh_process_pkt = false; 684 685 /* Ignore incoming packets from contexts without sockets, or resources 686 * that aren't vsock implementations. 687 */ 688 689 if (!vmci_transport_stream_allow(dg->src.context, -1) 690 || vmci_transport_peer_rid(dg->src.context) != dg->src.resource) 691 return VMCI_ERROR_NO_ACCESS; 692 693 if (VMCI_DG_SIZE(dg) < sizeof(*pkt)) 694 /* Drop datagrams that do not contain full VSock packets. */ 695 return VMCI_ERROR_INVALID_ARGS; 696 697 pkt = (struct vmci_transport_packet *)dg; 698 699 /* Find the socket that should handle this packet. First we look for a 700 * connected socket and if there is none we look for a socket bound to 701 * the destintation address. 702 */ 703 vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); 704 vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port); 705 706 sk = vsock_find_connected_socket(&src, &dst); 707 if (!sk) { 708 sk = vsock_find_bound_socket(&dst); 709 if (!sk) { 710 /* We could not find a socket for this specified 711 * address. If this packet is a RST, we just drop it. 712 * If it is another packet, we send a RST. Note that 713 * we do not send a RST reply to RSTs so that we do not 714 * continually send RSTs between two endpoints. 715 * 716 * Note that since this is a reply, dst is src and src 717 * is dst. 718 */ 719 if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) 720 pr_err("unable to send reset\n"); 721 722 err = VMCI_ERROR_NOT_FOUND; 723 goto out; 724 } 725 } 726 727 /* If the received packet type is beyond all types known to this 728 * implementation, reply with an invalid message. Hopefully this will 729 * help when implementing backwards compatibility in the future. 730 */ 731 if (pkt->type >= VMCI_TRANSPORT_PACKET_TYPE_MAX) { 732 vmci_transport_send_invalid_bh(&dst, &src); 733 err = VMCI_ERROR_INVALID_ARGS; 734 goto out; 735 } 736 737 /* This handler is privileged when this module is running on the host. 738 * We will get datagram connect requests from all endpoints (even VMs 739 * that are in a restricted context). If we get one from a restricted 740 * context then the destination socket must be trusted. 741 * 742 * NOTE: We access the socket struct without holding the lock here. 743 * This is ok because the field we are interested is never modified 744 * outside of the create and destruct socket functions. 745 */ 746 vsk = vsock_sk(sk); 747 if (!vmci_transport_allow_dgram(vsk, pkt->dg.src.context)) { 748 err = VMCI_ERROR_NO_ACCESS; 749 goto out; 750 } 751 752 /* We do most everything in a work queue, but let's fast path the 753 * notification of reads and writes to help data transfer performance. 754 * We can only do this if there is no process context code executing 755 * for this socket since that may change the state. 756 */ 757 bh_lock_sock(sk); 758 759 if (!sock_owned_by_user(sk)) { 760 /* The local context ID may be out of date, update it. */ 761 vsk->local_addr.svm_cid = dst.svm_cid; 762 763 if (sk->sk_state == TCP_ESTABLISHED) 764 vmci_trans(vsk)->notify_ops->handle_notify_pkt( 765 sk, pkt, true, &dst, &src, 766 &bh_process_pkt); 767 } 768 769 bh_unlock_sock(sk); 770 771 if (!bh_process_pkt) { 772 struct vmci_transport_recv_pkt_info *recv_pkt_info; 773 774 recv_pkt_info = kmalloc(sizeof(*recv_pkt_info), GFP_ATOMIC); 775 if (!recv_pkt_info) { 776 if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) 777 pr_err("unable to send reset\n"); 778 779 err = VMCI_ERROR_NO_MEM; 780 goto out; 781 } 782 783 recv_pkt_info->sk = sk; 784 memcpy(&recv_pkt_info->pkt, pkt, sizeof(recv_pkt_info->pkt)); 785 INIT_WORK(&recv_pkt_info->work, vmci_transport_recv_pkt_work); 786 787 schedule_work(&recv_pkt_info->work); 788 /* Clear sk so that the reference count incremented by one of 789 * the Find functions above is not decremented below. We need 790 * that reference count for the packet handler we've scheduled 791 * to run. 792 */ 793 sk = NULL; 794 } 795 796out: 797 if (sk) 798 sock_put(sk); 799 800 return err; 801} 802 803static void vmci_transport_handle_detach(struct sock *sk) 804{ 805 struct vsock_sock *vsk; 806 807 vsk = vsock_sk(sk); 808 if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) { 809 sock_set_flag(sk, SOCK_DONE); 810 811 /* On a detach the peer will not be sending or receiving 812 * anymore. 813 */ 814 vsk->peer_shutdown = SHUTDOWN_MASK; 815 816 /* We should not be sending anymore since the peer won't be 817 * there to receive, but we can still receive if there is data 818 * left in our consume queue. If the local endpoint is a host, 819 * we can't call vsock_stream_has_data, since that may block, 820 * but a host endpoint can't read data once the VM has 821 * detached, so there is no available data in that case. 822 */ 823 if (vsk->local_addr.svm_cid == VMADDR_CID_HOST || 824 vsock_stream_has_data(vsk) <= 0) { 825 if (sk->sk_state == TCP_SYN_SENT) { 826 /* The peer may detach from a queue pair while 827 * we are still in the connecting state, i.e., 828 * if the peer VM is killed after attaching to 829 * a queue pair, but before we complete the 830 * handshake. In that case, we treat the detach 831 * event like a reset. 832 */ 833 834 sk->sk_state = TCP_CLOSE; 835 sk->sk_err = ECONNRESET; 836 sk->sk_error_report(sk); 837 return; 838 } 839 sk->sk_state = TCP_CLOSE; 840 } 841 sk->sk_state_change(sk); 842 } 843} 844 845static void vmci_transport_peer_detach_cb(u32 sub_id, 846 const struct vmci_event_data *e_data, 847 void *client_data) 848{ 849 struct vmci_transport *trans = client_data; 850 const struct vmci_event_payload_qp *e_payload; 851 852 e_payload = vmci_event_data_const_payload(e_data); 853 854 /* XXX This is lame, we should provide a way to lookup sockets by 855 * qp_handle. 856 */ 857 if (vmci_handle_is_invalid(e_payload->handle) || 858 !vmci_handle_is_equal(trans->qp_handle, e_payload->handle)) 859 return; 860 861 /* We don't ask for delayed CBs when we subscribe to this event (we 862 * pass 0 as flags to vmci_event_subscribe()). VMCI makes no 863 * guarantees in that case about what context we might be running in, 864 * so it could be BH or process, blockable or non-blockable. So we 865 * need to account for all possible contexts here. 866 */ 867 spin_lock_bh(&trans->lock); 868 if (!trans->sk) 869 goto out; 870 871 /* Apart from here, trans->lock is only grabbed as part of sk destruct, 872 * where trans->sk isn't locked. 873 */ 874 bh_lock_sock(trans->sk); 875 876 vmci_transport_handle_detach(trans->sk); 877 878 bh_unlock_sock(trans->sk); 879 out: 880 spin_unlock_bh(&trans->lock); 881} 882 883static void vmci_transport_qp_resumed_cb(u32 sub_id, 884 const struct vmci_event_data *e_data, 885 void *client_data) 886{ 887 vsock_for_each_connected_socket(&vmci_transport, 888 vmci_transport_handle_detach); 889} 890 891static void vmci_transport_recv_pkt_work(struct work_struct *work) 892{ 893 struct vmci_transport_recv_pkt_info *recv_pkt_info; 894 struct vmci_transport_packet *pkt; 895 struct sock *sk; 896 897 recv_pkt_info = 898 container_of(work, struct vmci_transport_recv_pkt_info, work); 899 sk = recv_pkt_info->sk; 900 pkt = &recv_pkt_info->pkt; 901 902 lock_sock(sk); 903 904 /* The local context ID may be out of date. */ 905 vsock_sk(sk)->local_addr.svm_cid = pkt->dg.dst.context; 906 907 switch (sk->sk_state) { 908 case TCP_LISTEN: 909 vmci_transport_recv_listen(sk, pkt); 910 break; 911 case TCP_SYN_SENT: 912 /* Processing of pending connections for servers goes through 913 * the listening socket, so see vmci_transport_recv_listen() 914 * for that path. 915 */ 916 vmci_transport_recv_connecting_client(sk, pkt); 917 break; 918 case TCP_ESTABLISHED: 919 vmci_transport_recv_connected(sk, pkt); 920 break; 921 default: 922 /* Because this function does not run in the same context as 923 * vmci_transport_recv_stream_cb it is possible that the 924 * socket has closed. We need to let the other side know or it 925 * could be sitting in a connect and hang forever. Send a 926 * reset to prevent that. 927 */ 928 vmci_transport_send_reset(sk, pkt); 929 break; 930 } 931 932 release_sock(sk); 933 kfree(recv_pkt_info); 934 /* Release reference obtained in the stream callback when we fetched 935 * this socket out of the bound or connected list. 936 */ 937 sock_put(sk); 938} 939 940static int vmci_transport_recv_listen(struct sock *sk, 941 struct vmci_transport_packet *pkt) 942{ 943 struct sock *pending; 944 struct vsock_sock *vpending; 945 int err; 946 u64 qp_size; 947 bool old_request = false; 948 bool old_pkt_proto = false; 949 950 err = 0; 951 952 /* Because we are in the listen state, we could be receiving a packet 953 * for ourself or any previous connection requests that we received. 954 * If it's the latter, we try to find a socket in our list of pending 955 * connections and, if we do, call the appropriate handler for the 956 * state that that socket is in. Otherwise we try to service the 957 * connection request. 958 */ 959 pending = vmci_transport_get_pending(sk, pkt); 960 if (pending) { 961 lock_sock(pending); 962 963 /* The local context ID may be out of date. */ 964 vsock_sk(pending)->local_addr.svm_cid = pkt->dg.dst.context; 965 966 switch (pending->sk_state) { 967 case TCP_SYN_SENT: 968 err = vmci_transport_recv_connecting_server(sk, 969 pending, 970 pkt); 971 break; 972 default: 973 vmci_transport_send_reset(pending, pkt); 974 err = -EINVAL; 975 } 976 977 if (err < 0) 978 vsock_remove_pending(sk, pending); 979 980 release_sock(pending); 981 vmci_transport_release_pending(pending); 982 983 return err; 984 } 985 986 /* The listen state only accepts connection requests. Reply with a 987 * reset unless we received a reset. 988 */ 989 990 if (!(pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST || 991 pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)) { 992 vmci_transport_reply_reset(pkt); 993 return -EINVAL; 994 } 995 996 if (pkt->u.size == 0) { 997 vmci_transport_reply_reset(pkt); 998 return -EINVAL; 999 } 1000 1001 /* If this socket can't accommodate this connection request, we send a 1002 * reset. Otherwise we create and initialize a child socket and reply 1003 * with a connection negotiation. 1004 */ 1005 if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) { 1006 vmci_transport_reply_reset(pkt); 1007 return -ECONNREFUSED; 1008 } 1009 1010 pending = vsock_create_connected(sk); 1011 if (!pending) { 1012 vmci_transport_send_reset(sk, pkt); 1013 return -ENOMEM; 1014 } 1015 1016 vpending = vsock_sk(pending); 1017 1018 vsock_addr_init(&vpending->local_addr, pkt->dg.dst.context, 1019 pkt->dst_port); 1020 vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context, 1021 pkt->src_port); 1022 1023 err = vsock_assign_transport(vpending, vsock_sk(sk)); 1024 /* Transport assigned (looking at remote_addr) must be the same 1025 * where we received the request. 1026 */ 1027 if (err || !vmci_check_transport(vpending)) { 1028 vmci_transport_send_reset(sk, pkt); 1029 sock_put(pending); 1030 return err; 1031 } 1032 1033 /* If the proposed size fits within our min/max, accept it. Otherwise 1034 * propose our own size. 1035 */ 1036 if (pkt->u.size >= vpending->buffer_min_size && 1037 pkt->u.size <= vpending->buffer_max_size) { 1038 qp_size = pkt->u.size; 1039 } else { 1040 qp_size = vpending->buffer_size; 1041 } 1042 1043 /* Figure out if we are using old or new requests based on the 1044 * overrides pkt types sent by our peer. 1045 */ 1046 if (vmci_transport_old_proto_override(&old_pkt_proto)) { 1047 old_request = old_pkt_proto; 1048 } else { 1049 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST) 1050 old_request = true; 1051 else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2) 1052 old_request = false; 1053 1054 } 1055 1056 if (old_request) { 1057 /* Handle a REQUEST (or override) */ 1058 u16 version = VSOCK_PROTO_INVALID; 1059 if (vmci_transport_proto_to_notify_struct( 1060 pending, &version, true)) 1061 err = vmci_transport_send_negotiate(pending, qp_size); 1062 else 1063 err = -EINVAL; 1064 1065 } else { 1066 /* Handle a REQUEST2 (or override) */ 1067 int proto_int = pkt->proto; 1068 int pos; 1069 u16 active_proto_version = 0; 1070 1071 /* The list of possible protocols is the intersection of all 1072 * protocols the client supports ... plus all the protocols we 1073 * support. 1074 */ 1075 proto_int &= vmci_transport_new_proto_supported_versions(); 1076 1077 /* We choose the highest possible protocol version and use that 1078 * one. 1079 */ 1080 pos = fls(proto_int); 1081 if (pos) { 1082 active_proto_version = (1 << (pos - 1)); 1083 if (vmci_transport_proto_to_notify_struct( 1084 pending, &active_proto_version, false)) 1085 err = vmci_transport_send_negotiate2(pending, 1086 qp_size, 1087 active_proto_version); 1088 else 1089 err = -EINVAL; 1090 1091 } else { 1092 err = -EINVAL; 1093 } 1094 } 1095 1096 if (err < 0) { 1097 vmci_transport_send_reset(sk, pkt); 1098 sock_put(pending); 1099 err = vmci_transport_error_to_vsock_error(err); 1100 goto out; 1101 } 1102 1103 vsock_add_pending(sk, pending); 1104 sk_acceptq_added(sk); 1105 1106 pending->sk_state = TCP_SYN_SENT; 1107 vmci_trans(vpending)->produce_size = 1108 vmci_trans(vpending)->consume_size = qp_size; 1109 vpending->buffer_size = qp_size; 1110 1111 vmci_trans(vpending)->notify_ops->process_request(pending); 1112 1113 /* We might never receive another message for this socket and it's not 1114 * connected to any process, so we have to ensure it gets cleaned up 1115 * ourself. Our delayed work function will take care of that. Note 1116 * that we do not ever cancel this function since we have few 1117 * guarantees about its state when calling cancel_delayed_work(). 1118 * Instead we hold a reference on the socket for that function and make 1119 * it capable of handling cases where it needs to do nothing but 1120 * release that reference. 1121 */ 1122 vpending->listener = sk; 1123 sock_hold(sk); 1124 sock_hold(pending); 1125 schedule_delayed_work(&vpending->pending_work, HZ); 1126 1127out: 1128 return err; 1129} 1130 1131static int 1132vmci_transport_recv_connecting_server(struct sock *listener, 1133 struct sock *pending, 1134 struct vmci_transport_packet *pkt) 1135{ 1136 struct vsock_sock *vpending; 1137 struct vmci_handle handle; 1138 struct vmci_qp *qpair; 1139 bool is_local; 1140 u32 flags; 1141 u32 detach_sub_id; 1142 int err; 1143 int skerr; 1144 1145 vpending = vsock_sk(pending); 1146 detach_sub_id = VMCI_INVALID_ID; 1147 1148 switch (pkt->type) { 1149 case VMCI_TRANSPORT_PACKET_TYPE_OFFER: 1150 if (vmci_handle_is_invalid(pkt->u.handle)) { 1151 vmci_transport_send_reset(pending, pkt); 1152 skerr = EPROTO; 1153 err = -EINVAL; 1154 goto destroy; 1155 } 1156 break; 1157 default: 1158 /* Close and cleanup the connection. */ 1159 vmci_transport_send_reset(pending, pkt); 1160 skerr = EPROTO; 1161 err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; 1162 goto destroy; 1163 } 1164 1165 /* In order to complete the connection we need to attach to the offered 1166 * queue pair and send an attach notification. We also subscribe to the 1167 * detach event so we know when our peer goes away, and we do that 1168 * before attaching so we don't miss an event. If all this succeeds, 1169 * we update our state and wakeup anything waiting in accept() for a 1170 * connection. 1171 */ 1172 1173 /* We don't care about attach since we ensure the other side has 1174 * attached by specifying the ATTACH_ONLY flag below. 1175 */ 1176 err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, 1177 vmci_transport_peer_detach_cb, 1178 vmci_trans(vpending), &detach_sub_id); 1179 if (err < VMCI_SUCCESS) { 1180 vmci_transport_send_reset(pending, pkt); 1181 err = vmci_transport_error_to_vsock_error(err); 1182 skerr = -err; 1183 goto destroy; 1184 } 1185 1186 vmci_trans(vpending)->detach_sub_id = detach_sub_id; 1187 1188 /* Now attach to the queue pair the client created. */ 1189 handle = pkt->u.handle; 1190 1191 /* vpending->local_addr always has a context id so we do not need to 1192 * worry about VMADDR_CID_ANY in this case. 1193 */ 1194 is_local = 1195 vpending->remote_addr.svm_cid == vpending->local_addr.svm_cid; 1196 flags = VMCI_QPFLAG_ATTACH_ONLY; 1197 flags |= is_local ? VMCI_QPFLAG_LOCAL : 0; 1198 1199 err = vmci_transport_queue_pair_alloc( 1200 &qpair, 1201 &handle, 1202 vmci_trans(vpending)->produce_size, 1203 vmci_trans(vpending)->consume_size, 1204 pkt->dg.src.context, 1205 flags, 1206 vmci_transport_is_trusted( 1207 vpending, 1208 vpending->remote_addr.svm_cid)); 1209 if (err < 0) { 1210 vmci_transport_send_reset(pending, pkt); 1211 skerr = -err; 1212 goto destroy; 1213 } 1214 1215 vmci_trans(vpending)->qp_handle = handle; 1216 vmci_trans(vpending)->qpair = qpair; 1217 1218 /* When we send the attach message, we must be ready to handle incoming 1219 * control messages on the newly connected socket. So we move the 1220 * pending socket to the connected state before sending the attach 1221 * message. Otherwise, an incoming packet triggered by the attach being 1222 * received by the peer may be processed concurrently with what happens 1223 * below after sending the attach message, and that incoming packet 1224 * will find the listening socket instead of the (currently) pending 1225 * socket. Note that enqueueing the socket increments the reference 1226 * count, so even if a reset comes before the connection is accepted, 1227 * the socket will be valid until it is removed from the queue. 1228 * 1229 * If we fail sending the attach below, we remove the socket from the 1230 * connected list and move the socket to TCP_CLOSE before 1231 * releasing the lock, so a pending slow path processing of an incoming 1232 * packet will not see the socket in the connected state in that case. 1233 */ 1234 pending->sk_state = TCP_ESTABLISHED; 1235 1236 vsock_insert_connected(vpending); 1237 1238 /* Notify our peer of our attach. */ 1239 err = vmci_transport_send_attach(pending, handle); 1240 if (err < 0) { 1241 vsock_remove_connected(vpending); 1242 pr_err("Could not send attach\n"); 1243 vmci_transport_send_reset(pending, pkt); 1244 err = vmci_transport_error_to_vsock_error(err); 1245 skerr = -err; 1246 goto destroy; 1247 } 1248 1249 /* We have a connection. Move the now connected socket from the 1250 * listener's pending list to the accept queue so callers of accept() 1251 * can find it. 1252 */ 1253 vsock_remove_pending(listener, pending); 1254 vsock_enqueue_accept(listener, pending); 1255 1256 /* Callers of accept() will be be waiting on the listening socket, not 1257 * the pending socket. 1258 */ 1259 listener->sk_data_ready(listener); 1260 1261 return 0; 1262 1263destroy: 1264 pending->sk_err = skerr; 1265 pending->sk_state = TCP_CLOSE; 1266 /* As long as we drop our reference, all necessary cleanup will handle 1267 * when the cleanup function drops its reference and our destruct 1268 * implementation is called. Note that since the listen handler will 1269 * remove pending from the pending list upon our failure, the cleanup 1270 * function won't drop the additional reference, which is why we do it 1271 * here. 1272 */ 1273 sock_put(pending); 1274 1275 return err; 1276} 1277 1278static int 1279vmci_transport_recv_connecting_client(struct sock *sk, 1280 struct vmci_transport_packet *pkt) 1281{ 1282 struct vsock_sock *vsk; 1283 int err; 1284 int skerr; 1285 1286 vsk = vsock_sk(sk); 1287 1288 switch (pkt->type) { 1289 case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: 1290 if (vmci_handle_is_invalid(pkt->u.handle) || 1291 !vmci_handle_is_equal(pkt->u.handle, 1292 vmci_trans(vsk)->qp_handle)) { 1293 skerr = EPROTO; 1294 err = -EINVAL; 1295 goto destroy; 1296 } 1297 1298 /* Signify the socket is connected and wakeup the waiter in 1299 * connect(). Also place the socket in the connected table for 1300 * accounting (it can already be found since it's in the bound 1301 * table). 1302 */ 1303 sk->sk_state = TCP_ESTABLISHED; 1304 sk->sk_socket->state = SS_CONNECTED; 1305 vsock_insert_connected(vsk); 1306 sk->sk_state_change(sk); 1307 1308 break; 1309 case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: 1310 case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: 1311 if (pkt->u.size == 0 1312 || pkt->dg.src.context != vsk->remote_addr.svm_cid 1313 || pkt->src_port != vsk->remote_addr.svm_port 1314 || !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle) 1315 || vmci_trans(vsk)->qpair 1316 || vmci_trans(vsk)->produce_size != 0 1317 || vmci_trans(vsk)->consume_size != 0 1318 || vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) { 1319 skerr = EPROTO; 1320 err = -EINVAL; 1321 1322 goto destroy; 1323 } 1324 1325 err = vmci_transport_recv_connecting_client_negotiate(sk, pkt); 1326 if (err) { 1327 skerr = -err; 1328 goto destroy; 1329 } 1330 1331 break; 1332 case VMCI_TRANSPORT_PACKET_TYPE_INVALID: 1333 err = vmci_transport_recv_connecting_client_invalid(sk, pkt); 1334 if (err) { 1335 skerr = -err; 1336 goto destroy; 1337 } 1338 1339 break; 1340 case VMCI_TRANSPORT_PACKET_TYPE_RST: 1341 /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to 1342 * continue processing here after they sent an INVALID packet. 1343 * This meant that we got a RST after the INVALID. We ignore a 1344 * RST after an INVALID. The common code doesn't send the RST 1345 * ... so we can hang if an old version of the common code 1346 * fails between getting a REQUEST and sending an OFFER back. 1347 * Not much we can do about it... except hope that it doesn't 1348 * happen. 1349 */ 1350 if (vsk->ignore_connecting_rst) { 1351 vsk->ignore_connecting_rst = false; 1352 } else { 1353 skerr = ECONNRESET; 1354 err = 0; 1355 goto destroy; 1356 } 1357 1358 break; 1359 default: 1360 /* Close and cleanup the connection. */ 1361 skerr = EPROTO; 1362 err = -EINVAL; 1363 goto destroy; 1364 } 1365 1366 return 0; 1367 1368destroy: 1369 vmci_transport_send_reset(sk, pkt); 1370 1371 sk->sk_state = TCP_CLOSE; 1372 sk->sk_err = skerr; 1373 sk->sk_error_report(sk); 1374 return err; 1375} 1376 1377static int vmci_transport_recv_connecting_client_negotiate( 1378 struct sock *sk, 1379 struct vmci_transport_packet *pkt) 1380{ 1381 int err; 1382 struct vsock_sock *vsk; 1383 struct vmci_handle handle; 1384 struct vmci_qp *qpair; 1385 u32 detach_sub_id; 1386 bool is_local; 1387 u32 flags; 1388 bool old_proto = true; 1389 bool old_pkt_proto; 1390 u16 version; 1391 1392 vsk = vsock_sk(sk); 1393 handle = VMCI_INVALID_HANDLE; 1394 detach_sub_id = VMCI_INVALID_ID; 1395 1396 /* If we have gotten here then we should be past the point where old 1397 * linux vsock could have sent the bogus rst. 1398 */ 1399 vsk->sent_request = false; 1400 vsk->ignore_connecting_rst = false; 1401 1402 /* Verify that we're OK with the proposed queue pair size */ 1403 if (pkt->u.size < vsk->buffer_min_size || 1404 pkt->u.size > vsk->buffer_max_size) { 1405 err = -EINVAL; 1406 goto destroy; 1407 } 1408 1409 /* At this point we know the CID the peer is using to talk to us. */ 1410 1411 if (vsk->local_addr.svm_cid == VMADDR_CID_ANY) 1412 vsk->local_addr.svm_cid = pkt->dg.dst.context; 1413 1414 /* Setup the notify ops to be the highest supported version that both 1415 * the server and the client support. 1416 */ 1417 1418 if (vmci_transport_old_proto_override(&old_pkt_proto)) { 1419 old_proto = old_pkt_proto; 1420 } else { 1421 if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE) 1422 old_proto = true; 1423 else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2) 1424 old_proto = false; 1425 1426 } 1427 1428 if (old_proto) 1429 version = VSOCK_PROTO_INVALID; 1430 else 1431 version = pkt->proto; 1432 1433 if (!vmci_transport_proto_to_notify_struct(sk, &version, old_proto)) { 1434 err = -EINVAL; 1435 goto destroy; 1436 } 1437 1438 /* Subscribe to detach events first. 1439 * 1440 * XXX We attach once for each queue pair created for now so it is easy 1441 * to find the socket (it's provided), but later we should only 1442 * subscribe once and add a way to lookup sockets by queue pair handle. 1443 */ 1444 err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, 1445 vmci_transport_peer_detach_cb, 1446 vmci_trans(vsk), &detach_sub_id); 1447 if (err < VMCI_SUCCESS) { 1448 err = vmci_transport_error_to_vsock_error(err); 1449 goto destroy; 1450 } 1451 1452 /* Make VMCI select the handle for us. */ 1453 handle = VMCI_INVALID_HANDLE; 1454 is_local = vsk->remote_addr.svm_cid == vsk->local_addr.svm_cid; 1455 flags = is_local ? VMCI_QPFLAG_LOCAL : 0; 1456 1457 err = vmci_transport_queue_pair_alloc(&qpair, 1458 &handle, 1459 pkt->u.size, 1460 pkt->u.size, 1461 vsk->remote_addr.svm_cid, 1462 flags, 1463 vmci_transport_is_trusted( 1464 vsk, 1465 vsk-> 1466 remote_addr.svm_cid)); 1467 if (err < 0) 1468 goto destroy; 1469 1470 err = vmci_transport_send_qp_offer(sk, handle); 1471 if (err < 0) { 1472 err = vmci_transport_error_to_vsock_error(err); 1473 goto destroy; 1474 } 1475 1476 vmci_trans(vsk)->qp_handle = handle; 1477 vmci_trans(vsk)->qpair = qpair; 1478 1479 vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 1480 pkt->u.size; 1481 1482 vmci_trans(vsk)->detach_sub_id = detach_sub_id; 1483 1484 vmci_trans(vsk)->notify_ops->process_negotiate(sk); 1485 1486 return 0; 1487 1488destroy: 1489 if (detach_sub_id != VMCI_INVALID_ID) 1490 vmci_event_unsubscribe(detach_sub_id); 1491 1492 if (!vmci_handle_is_invalid(handle)) 1493 vmci_qpair_detach(&qpair); 1494 1495 return err; 1496} 1497 1498static int 1499vmci_transport_recv_connecting_client_invalid(struct sock *sk, 1500 struct vmci_transport_packet *pkt) 1501{ 1502 int err = 0; 1503 struct vsock_sock *vsk = vsock_sk(sk); 1504 1505 if (vsk->sent_request) { 1506 vsk->sent_request = false; 1507 vsk->ignore_connecting_rst = true; 1508 1509 err = vmci_transport_send_conn_request(sk, vsk->buffer_size); 1510 if (err < 0) 1511 err = vmci_transport_error_to_vsock_error(err); 1512 else 1513 err = 0; 1514 1515 } 1516 1517 return err; 1518} 1519 1520static int vmci_transport_recv_connected(struct sock *sk, 1521 struct vmci_transport_packet *pkt) 1522{ 1523 struct vsock_sock *vsk; 1524 bool pkt_processed = false; 1525 1526 /* In cases where we are closing the connection, it's sufficient to 1527 * mark the state change (and maybe error) and wake up any waiting 1528 * threads. Since this is a connected socket, it's owned by a user 1529 * process and will be cleaned up when the failure is passed back on 1530 * the current or next system call. Our system call implementations 1531 * must therefore check for error and state changes on entry and when 1532 * being awoken. 1533 */ 1534 switch (pkt->type) { 1535 case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: 1536 if (pkt->u.mode) { 1537 vsk = vsock_sk(sk); 1538 1539 vsk->peer_shutdown |= pkt->u.mode; 1540 sk->sk_state_change(sk); 1541 } 1542 break; 1543 1544 case VMCI_TRANSPORT_PACKET_TYPE_RST: 1545 vsk = vsock_sk(sk); 1546 /* It is possible that we sent our peer a message (e.g a 1547 * WAITING_READ) right before we got notified that the peer had 1548 * detached. If that happens then we can get a RST pkt back 1549 * from our peer even though there is data available for us to 1550 * read. In that case, don't shutdown the socket completely but 1551 * instead allow the local client to finish reading data off 1552 * the queuepair. Always treat a RST pkt in connected mode like 1553 * a clean shutdown. 1554 */ 1555 sock_set_flag(sk, SOCK_DONE); 1556 vsk->peer_shutdown = SHUTDOWN_MASK; 1557 if (vsock_stream_has_data(vsk) <= 0) 1558 sk->sk_state = TCP_CLOSING; 1559 1560 sk->sk_state_change(sk); 1561 break; 1562 1563 default: 1564 vsk = vsock_sk(sk); 1565 vmci_trans(vsk)->notify_ops->handle_notify_pkt( 1566 sk, pkt, false, NULL, NULL, 1567 &pkt_processed); 1568 if (!pkt_processed) 1569 return -EINVAL; 1570 1571 break; 1572 } 1573 1574 return 0; 1575} 1576 1577static int vmci_transport_socket_init(struct vsock_sock *vsk, 1578 struct vsock_sock *psk) 1579{ 1580 vsk->trans = kmalloc(sizeof(struct vmci_transport), GFP_KERNEL); 1581 if (!vsk->trans) 1582 return -ENOMEM; 1583 1584 vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; 1585 vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE; 1586 vmci_trans(vsk)->qpair = NULL; 1587 vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 0; 1588 vmci_trans(vsk)->detach_sub_id = VMCI_INVALID_ID; 1589 vmci_trans(vsk)->notify_ops = NULL; 1590 INIT_LIST_HEAD(&vmci_trans(vsk)->elem); 1591 vmci_trans(vsk)->sk = &vsk->sk; 1592 spin_lock_init(&vmci_trans(vsk)->lock); 1593 1594 return 0; 1595} 1596 1597static void vmci_transport_free_resources(struct list_head *transport_list) 1598{ 1599 while (!list_empty(transport_list)) { 1600 struct vmci_transport *transport = 1601 list_first_entry(transport_list, struct vmci_transport, 1602 elem); 1603 list_del(&transport->elem); 1604 1605 if (transport->detach_sub_id != VMCI_INVALID_ID) { 1606 vmci_event_unsubscribe(transport->detach_sub_id); 1607 transport->detach_sub_id = VMCI_INVALID_ID; 1608 } 1609 1610 if (!vmci_handle_is_invalid(transport->qp_handle)) { 1611 vmci_qpair_detach(&transport->qpair); 1612 transport->qp_handle = VMCI_INVALID_HANDLE; 1613 transport->produce_size = 0; 1614 transport->consume_size = 0; 1615 } 1616 1617 kfree(transport); 1618 } 1619} 1620 1621static void vmci_transport_cleanup(struct work_struct *work) 1622{ 1623 LIST_HEAD(pending); 1624 1625 spin_lock_bh(&vmci_transport_cleanup_lock); 1626 list_replace_init(&vmci_transport_cleanup_list, &pending); 1627 spin_unlock_bh(&vmci_transport_cleanup_lock); 1628 vmci_transport_free_resources(&pending); 1629} 1630 1631static void vmci_transport_destruct(struct vsock_sock *vsk) 1632{ 1633 /* transport can be NULL if we hit a failure at init() time */ 1634 if (!vmci_trans(vsk)) 1635 return; 1636 1637 /* Ensure that the detach callback doesn't use the sk/vsk 1638 * we are about to destruct. 1639 */ 1640 spin_lock_bh(&vmci_trans(vsk)->lock); 1641 vmci_trans(vsk)->sk = NULL; 1642 spin_unlock_bh(&vmci_trans(vsk)->lock); 1643 1644 if (vmci_trans(vsk)->notify_ops) 1645 vmci_trans(vsk)->notify_ops->socket_destruct(vsk); 1646 1647 spin_lock_bh(&vmci_transport_cleanup_lock); 1648 list_add(&vmci_trans(vsk)->elem, &vmci_transport_cleanup_list); 1649 spin_unlock_bh(&vmci_transport_cleanup_lock); 1650 schedule_work(&vmci_transport_cleanup_work); 1651 1652 vsk->trans = NULL; 1653} 1654 1655static void vmci_transport_release(struct vsock_sock *vsk) 1656{ 1657 vsock_remove_sock(vsk); 1658 1659 if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) { 1660 vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle); 1661 vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; 1662 } 1663} 1664 1665static int vmci_transport_dgram_bind(struct vsock_sock *vsk, 1666 struct sockaddr_vm *addr) 1667{ 1668 u32 port; 1669 u32 flags; 1670 int err; 1671 1672 /* VMCI will select a resource ID for us if we provide 1673 * VMCI_INVALID_ID. 1674 */ 1675 port = addr->svm_port == VMADDR_PORT_ANY ? 1676 VMCI_INVALID_ID : addr->svm_port; 1677 1678 if (port <= LAST_RESERVED_PORT && !capable(CAP_NET_BIND_SERVICE)) 1679 return -EACCES; 1680 1681 flags = addr->svm_cid == VMADDR_CID_ANY ? 1682 VMCI_FLAG_ANYCID_DG_HND : 0; 1683 1684 err = vmci_transport_datagram_create_hnd(port, flags, 1685 vmci_transport_recv_dgram_cb, 1686 &vsk->sk, 1687 &vmci_trans(vsk)->dg_handle); 1688 if (err < VMCI_SUCCESS) 1689 return vmci_transport_error_to_vsock_error(err); 1690 vsock_addr_init(&vsk->local_addr, addr->svm_cid, 1691 vmci_trans(vsk)->dg_handle.resource); 1692 1693 return 0; 1694} 1695 1696static int vmci_transport_dgram_enqueue( 1697 struct vsock_sock *vsk, 1698 struct sockaddr_vm *remote_addr, 1699 struct msghdr *msg, 1700 size_t len) 1701{ 1702 int err; 1703 struct vmci_datagram *dg; 1704 1705 if (len > VMCI_MAX_DG_PAYLOAD_SIZE) 1706 return -EMSGSIZE; 1707 1708 if (!vmci_transport_allow_dgram(vsk, remote_addr->svm_cid)) 1709 return -EPERM; 1710 1711 /* Allocate a buffer for the user's message and our packet header. */ 1712 dg = kmalloc(len + sizeof(*dg), GFP_KERNEL); 1713 if (!dg) 1714 return -ENOMEM; 1715 1716 err = memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len); 1717 if (err) { 1718 kfree(dg); 1719 return err; 1720 } 1721 1722 dg->dst = vmci_make_handle(remote_addr->svm_cid, 1723 remote_addr->svm_port); 1724 dg->src = vmci_make_handle(vsk->local_addr.svm_cid, 1725 vsk->local_addr.svm_port); 1726 dg->payload_size = len; 1727 1728 err = vmci_datagram_send(dg); 1729 kfree(dg); 1730 if (err < 0) 1731 return vmci_transport_error_to_vsock_error(err); 1732 1733 return err - sizeof(*dg); 1734} 1735 1736static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk, 1737 struct msghdr *msg, size_t len, 1738 int flags) 1739{ 1740 int err; 1741 int noblock; 1742 struct vmci_datagram *dg; 1743 size_t payload_len; 1744 struct sk_buff *skb; 1745 1746 noblock = flags & MSG_DONTWAIT; 1747 1748 if (flags & MSG_OOB || flags & MSG_ERRQUEUE) 1749 return -EOPNOTSUPP; 1750 1751 /* Retrieve the head sk_buff from the socket's receive queue. */ 1752 err = 0; 1753 skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err); 1754 if (!skb) 1755 return err; 1756 1757 dg = (struct vmci_datagram *)skb->data; 1758 if (!dg) 1759 /* err is 0, meaning we read zero bytes. */ 1760 goto out; 1761 1762 payload_len = dg->payload_size; 1763 /* Ensure the sk_buff matches the payload size claimed in the packet. */ 1764 if (payload_len != skb->len - sizeof(*dg)) { 1765 err = -EINVAL; 1766 goto out; 1767 } 1768 1769 if (payload_len > len) { 1770 payload_len = len; 1771 msg->msg_flags |= MSG_TRUNC; 1772 } 1773 1774 /* Place the datagram payload in the user's iovec. */ 1775 err = skb_copy_datagram_msg(skb, sizeof(*dg), msg, payload_len); 1776 if (err) 1777 goto out; 1778 1779 if (msg->msg_name) { 1780 /* Provide the address of the sender. */ 1781 DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name); 1782 vsock_addr_init(vm_addr, dg->src.context, dg->src.resource); 1783 msg->msg_namelen = sizeof(*vm_addr); 1784 } 1785 err = payload_len; 1786 1787out: 1788 skb_free_datagram(&vsk->sk, skb); 1789 return err; 1790} 1791 1792static bool vmci_transport_dgram_allow(u32 cid, u32 port) 1793{ 1794 if (cid == VMADDR_CID_HYPERVISOR) { 1795 /* Registrations of PBRPC Servers do not modify VMX/Hypervisor 1796 * state and are allowed. 1797 */ 1798 return port == VMCI_UNITY_PBRPC_REGISTER; 1799 } 1800 1801 return true; 1802} 1803 1804static int vmci_transport_connect(struct vsock_sock *vsk) 1805{ 1806 int err; 1807 bool old_pkt_proto = false; 1808 struct sock *sk = &vsk->sk; 1809 1810 if (vmci_transport_old_proto_override(&old_pkt_proto) && 1811 old_pkt_proto) { 1812 err = vmci_transport_send_conn_request(sk, vsk->buffer_size); 1813 if (err < 0) { 1814 sk->sk_state = TCP_CLOSE; 1815 return err; 1816 } 1817 } else { 1818 int supported_proto_versions = 1819 vmci_transport_new_proto_supported_versions(); 1820 err = vmci_transport_send_conn_request2(sk, vsk->buffer_size, 1821 supported_proto_versions); 1822 if (err < 0) { 1823 sk->sk_state = TCP_CLOSE; 1824 return err; 1825 } 1826 1827 vsk->sent_request = true; 1828 } 1829 1830 return err; 1831} 1832 1833static ssize_t vmci_transport_stream_dequeue( 1834 struct vsock_sock *vsk, 1835 struct msghdr *msg, 1836 size_t len, 1837 int flags) 1838{ 1839 if (flags & MSG_PEEK) 1840 return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0); 1841 else 1842 return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0); 1843} 1844 1845static ssize_t vmci_transport_stream_enqueue( 1846 struct vsock_sock *vsk, 1847 struct msghdr *msg, 1848 size_t len) 1849{ 1850 return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0); 1851} 1852 1853static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk) 1854{ 1855 return vmci_qpair_consume_buf_ready(vmci_trans(vsk)->qpair); 1856} 1857 1858static s64 vmci_transport_stream_has_space(struct vsock_sock *vsk) 1859{ 1860 return vmci_qpair_produce_free_space(vmci_trans(vsk)->qpair); 1861} 1862 1863static u64 vmci_transport_stream_rcvhiwat(struct vsock_sock *vsk) 1864{ 1865 return vmci_trans(vsk)->consume_size; 1866} 1867 1868static bool vmci_transport_stream_is_active(struct vsock_sock *vsk) 1869{ 1870 return !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle); 1871} 1872 1873static int vmci_transport_notify_poll_in( 1874 struct vsock_sock *vsk, 1875 size_t target, 1876 bool *data_ready_now) 1877{ 1878 return vmci_trans(vsk)->notify_ops->poll_in( 1879 &vsk->sk, target, data_ready_now); 1880} 1881 1882static int vmci_transport_notify_poll_out( 1883 struct vsock_sock *vsk, 1884 size_t target, 1885 bool *space_available_now) 1886{ 1887 return vmci_trans(vsk)->notify_ops->poll_out( 1888 &vsk->sk, target, space_available_now); 1889} 1890 1891static int vmci_transport_notify_recv_init( 1892 struct vsock_sock *vsk, 1893 size_t target, 1894 struct vsock_transport_recv_notify_data *data) 1895{ 1896 return vmci_trans(vsk)->notify_ops->recv_init( 1897 &vsk->sk, target, 1898 (struct vmci_transport_recv_notify_data *)data); 1899} 1900 1901static int vmci_transport_notify_recv_pre_block( 1902 struct vsock_sock *vsk, 1903 size_t target, 1904 struct vsock_transport_recv_notify_data *data) 1905{ 1906 return vmci_trans(vsk)->notify_ops->recv_pre_block( 1907 &vsk->sk, target, 1908 (struct vmci_transport_recv_notify_data *)data); 1909} 1910 1911static int vmci_transport_notify_recv_pre_dequeue( 1912 struct vsock_sock *vsk, 1913 size_t target, 1914 struct vsock_transport_recv_notify_data *data) 1915{ 1916 return vmci_trans(vsk)->notify_ops->recv_pre_dequeue( 1917 &vsk->sk, target, 1918 (struct vmci_transport_recv_notify_data *)data); 1919} 1920 1921static int vmci_transport_notify_recv_post_dequeue( 1922 struct vsock_sock *vsk, 1923 size_t target, 1924 ssize_t copied, 1925 bool data_read, 1926 struct vsock_transport_recv_notify_data *data) 1927{ 1928 return vmci_trans(vsk)->notify_ops->recv_post_dequeue( 1929 &vsk->sk, target, copied, data_read, 1930 (struct vmci_transport_recv_notify_data *)data); 1931} 1932 1933static int vmci_transport_notify_send_init( 1934 struct vsock_sock *vsk, 1935 struct vsock_transport_send_notify_data *data) 1936{ 1937 return vmci_trans(vsk)->notify_ops->send_init( 1938 &vsk->sk, 1939 (struct vmci_transport_send_notify_data *)data); 1940} 1941 1942static int vmci_transport_notify_send_pre_block( 1943 struct vsock_sock *vsk, 1944 struct vsock_transport_send_notify_data *data) 1945{ 1946 return vmci_trans(vsk)->notify_ops->send_pre_block( 1947 &vsk->sk, 1948 (struct vmci_transport_send_notify_data *)data); 1949} 1950 1951static int vmci_transport_notify_send_pre_enqueue( 1952 struct vsock_sock *vsk, 1953 struct vsock_transport_send_notify_data *data) 1954{ 1955 return vmci_trans(vsk)->notify_ops->send_pre_enqueue( 1956 &vsk->sk, 1957 (struct vmci_transport_send_notify_data *)data); 1958} 1959 1960static int vmci_transport_notify_send_post_enqueue( 1961 struct vsock_sock *vsk, 1962 ssize_t written, 1963 struct vsock_transport_send_notify_data *data) 1964{ 1965 return vmci_trans(vsk)->notify_ops->send_post_enqueue( 1966 &vsk->sk, written, 1967 (struct vmci_transport_send_notify_data *)data); 1968} 1969 1970static bool vmci_transport_old_proto_override(bool *old_pkt_proto) 1971{ 1972 if (PROTOCOL_OVERRIDE != -1) { 1973 if (PROTOCOL_OVERRIDE == 0) 1974 *old_pkt_proto = true; 1975 else 1976 *old_pkt_proto = false; 1977 1978 pr_info("Proto override in use\n"); 1979 return true; 1980 } 1981 1982 return false; 1983} 1984 1985static bool vmci_transport_proto_to_notify_struct(struct sock *sk, 1986 u16 *proto, 1987 bool old_pkt_proto) 1988{ 1989 struct vsock_sock *vsk = vsock_sk(sk); 1990 1991 if (old_pkt_proto) { 1992 if (*proto != VSOCK_PROTO_INVALID) { 1993 pr_err("Can't set both an old and new protocol\n"); 1994 return false; 1995 } 1996 vmci_trans(vsk)->notify_ops = &vmci_transport_notify_pkt_ops; 1997 goto exit; 1998 } 1999 2000 switch (*proto) { 2001 case VSOCK_PROTO_PKT_ON_NOTIFY: 2002 vmci_trans(vsk)->notify_ops = 2003 &vmci_transport_notify_pkt_q_state_ops; 2004 break; 2005 default: 2006 pr_err("Unknown notify protocol version\n"); 2007 return false; 2008 } 2009 2010exit: 2011 vmci_trans(vsk)->notify_ops->socket_init(sk); 2012 return true; 2013} 2014 2015static u16 vmci_transport_new_proto_supported_versions(void) 2016{ 2017 if (PROTOCOL_OVERRIDE != -1) 2018 return PROTOCOL_OVERRIDE; 2019 2020 return VSOCK_PROTO_ALL_SUPPORTED; 2021} 2022 2023static u32 vmci_transport_get_local_cid(void) 2024{ 2025 return vmci_get_context_id(); 2026} 2027 2028static struct vsock_transport vmci_transport = { 2029 .module = THIS_MODULE, 2030 .init = vmci_transport_socket_init, 2031 .destruct = vmci_transport_destruct, 2032 .release = vmci_transport_release, 2033 .connect = vmci_transport_connect, 2034 .dgram_bind = vmci_transport_dgram_bind, 2035 .dgram_dequeue = vmci_transport_dgram_dequeue, 2036 .dgram_enqueue = vmci_transport_dgram_enqueue, 2037 .dgram_allow = vmci_transport_dgram_allow, 2038 .stream_dequeue = vmci_transport_stream_dequeue, 2039 .stream_enqueue = vmci_transport_stream_enqueue, 2040 .stream_has_data = vmci_transport_stream_has_data, 2041 .stream_has_space = vmci_transport_stream_has_space, 2042 .stream_rcvhiwat = vmci_transport_stream_rcvhiwat, 2043 .stream_is_active = vmci_transport_stream_is_active, 2044 .stream_allow = vmci_transport_stream_allow, 2045 .notify_poll_in = vmci_transport_notify_poll_in, 2046 .notify_poll_out = vmci_transport_notify_poll_out, 2047 .notify_recv_init = vmci_transport_notify_recv_init, 2048 .notify_recv_pre_block = vmci_transport_notify_recv_pre_block, 2049 .notify_recv_pre_dequeue = vmci_transport_notify_recv_pre_dequeue, 2050 .notify_recv_post_dequeue = vmci_transport_notify_recv_post_dequeue, 2051 .notify_send_init = vmci_transport_notify_send_init, 2052 .notify_send_pre_block = vmci_transport_notify_send_pre_block, 2053 .notify_send_pre_enqueue = vmci_transport_notify_send_pre_enqueue, 2054 .notify_send_post_enqueue = vmci_transport_notify_send_post_enqueue, 2055 .shutdown = vmci_transport_shutdown, 2056 .get_local_cid = vmci_transport_get_local_cid, 2057}; 2058 2059static bool vmci_check_transport(struct vsock_sock *vsk) 2060{ 2061 return vsk->transport == &vmci_transport; 2062} 2063 2064static void vmci_vsock_transport_cb(bool is_host) 2065{ 2066 int features; 2067 2068 if (is_host) 2069 features = VSOCK_TRANSPORT_F_H2G; 2070 else 2071 features = VSOCK_TRANSPORT_F_G2H; 2072 2073 vsock_core_register(&vmci_transport, features); 2074} 2075 2076static int __init vmci_transport_init(void) 2077{ 2078 int err; 2079 2080 /* Create the datagram handle that we will use to send and receive all 2081 * VSocket control messages for this context. 2082 */ 2083 err = vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID, 2084 VMCI_FLAG_ANYCID_DG_HND, 2085 vmci_transport_recv_stream_cb, 2086 NULL, 2087 &vmci_transport_stream_handle); 2088 if (err < VMCI_SUCCESS) { 2089 pr_err("Unable to create datagram handle. (%d)\n", err); 2090 return vmci_transport_error_to_vsock_error(err); 2091 } 2092 err = vmci_event_subscribe(VMCI_EVENT_QP_RESUMED, 2093 vmci_transport_qp_resumed_cb, 2094 NULL, &vmci_transport_qp_resumed_sub_id); 2095 if (err < VMCI_SUCCESS) { 2096 pr_err("Unable to subscribe to resumed event. (%d)\n", err); 2097 err = vmci_transport_error_to_vsock_error(err); 2098 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; 2099 goto err_destroy_stream_handle; 2100 } 2101 2102 /* Register only with dgram feature, other features (H2G, G2H) will be 2103 * registered when the first host or guest becomes active. 2104 */ 2105 err = vsock_core_register(&vmci_transport, VSOCK_TRANSPORT_F_DGRAM); 2106 if (err < 0) 2107 goto err_unsubscribe; 2108 2109 err = vmci_register_vsock_callback(vmci_vsock_transport_cb); 2110 if (err < 0) 2111 goto err_unregister; 2112 2113 return 0; 2114 2115err_unregister: 2116 vsock_core_unregister(&vmci_transport); 2117err_unsubscribe: 2118 vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); 2119err_destroy_stream_handle: 2120 vmci_datagram_destroy_handle(vmci_transport_stream_handle); 2121 return err; 2122} 2123module_init(vmci_transport_init); 2124 2125static void __exit vmci_transport_exit(void) 2126{ 2127 cancel_work_sync(&vmci_transport_cleanup_work); 2128 vmci_transport_free_resources(&vmci_transport_cleanup_list); 2129 2130 if (!vmci_handle_is_invalid(vmci_transport_stream_handle)) { 2131 if (vmci_datagram_destroy_handle( 2132 vmci_transport_stream_handle) != VMCI_SUCCESS) 2133 pr_err("Couldn't destroy datagram handle\n"); 2134 vmci_transport_stream_handle = VMCI_INVALID_HANDLE; 2135 } 2136 2137 if (vmci_transport_qp_resumed_sub_id != VMCI_INVALID_ID) { 2138 vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); 2139 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; 2140 } 2141 2142 vmci_register_vsock_callback(NULL); 2143 vsock_core_unregister(&vmci_transport); 2144} 2145module_exit(vmci_transport_exit); 2146 2147MODULE_AUTHOR("VMware, Inc."); 2148MODULE_DESCRIPTION("VMCI transport for Virtual Sockets"); 2149MODULE_VERSION("1.0.5.0-k"); 2150MODULE_LICENSE("GPL v2"); 2151MODULE_ALIAS("vmware_vsock"); 2152MODULE_ALIAS_NETPROTO(PF_VSOCK); 2153