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-rw-r--r--net/vmw_vsock/vmci_transport.c2157
1 files changed, 2157 insertions, 0 deletions
diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
new file mode 100644
index 000000000000..e8a87cf37072
--- /dev/null
+++ b/net/vmw_vsock/vmci_transport.c
@@ -0,0 +1,2157 @@
+/*
+ * VMware vSockets Driver
+ *
+ * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation version 2 and no later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/types.h>
+
+#define EXPORT_SYMTAB
+#include <linux/bitops.h>
+#include <linux/cred.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/list.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/net.h>
+#include <linux/poll.h>
+#include <linux/skbuff.h>
+#include <linux/smp.h>
+#include <linux/socket.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <net/sock.h>
+
+#include "af_vsock.h"
+#include "vmci_transport_notify.h"
+
+static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg);
+static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg);
+static void vmci_transport_peer_attach_cb(u32 sub_id,
+ const struct vmci_event_data *ed,
+ void *client_data);
+static void vmci_transport_peer_detach_cb(u32 sub_id,
+ const struct vmci_event_data *ed,
+ void *client_data);
+static void vmci_transport_recv_pkt_work(struct work_struct *work);
+static int vmci_transport_recv_listen(struct sock *sk,
+ struct vmci_transport_packet *pkt);
+static int vmci_transport_recv_connecting_server(
+ struct sock *sk,
+ struct sock *pending,
+ struct vmci_transport_packet *pkt);
+static int vmci_transport_recv_connecting_client(
+ struct sock *sk,
+ struct vmci_transport_packet *pkt);
+static int vmci_transport_recv_connecting_client_negotiate(
+ struct sock *sk,
+ struct vmci_transport_packet *pkt);
+static int vmci_transport_recv_connecting_client_invalid(
+ struct sock *sk,
+ struct vmci_transport_packet *pkt);
+static int vmci_transport_recv_connected(struct sock *sk,
+ struct vmci_transport_packet *pkt);
+static bool vmci_transport_old_proto_override(bool *old_pkt_proto);
+static u16 vmci_transport_new_proto_supported_versions(void);
+static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto,
+ bool old_pkt_proto);
+
+struct vmci_transport_recv_pkt_info {
+ struct work_struct work;
+ struct sock *sk;
+ struct vmci_transport_packet pkt;
+};
+
+static struct vmci_handle vmci_transport_stream_handle = { VMCI_INVALID_ID,
+ VMCI_INVALID_ID };
+static u32 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
+
+static int PROTOCOL_OVERRIDE = -1;
+
+#define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN 128
+#define VMCI_TRANSPORT_DEFAULT_QP_SIZE 262144
+#define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX 262144
+
+/* The default peer timeout indicates how long we will wait for a peer response
+ * to a control message.
+ */
+#define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
+
+#define SS_LISTEN 255
+
+/* Helper function to convert from a VMCI error code to a VSock error code. */
+
+static s32 vmci_transport_error_to_vsock_error(s32 vmci_error)
+{
+ int err;
+
+ switch (vmci_error) {
+ case VMCI_ERROR_NO_MEM:
+ err = ENOMEM;
+ break;
+ case VMCI_ERROR_DUPLICATE_ENTRY:
+ case VMCI_ERROR_ALREADY_EXISTS:
+ err = EADDRINUSE;
+ break;
+ case VMCI_ERROR_NO_ACCESS:
+ err = EPERM;
+ break;
+ case VMCI_ERROR_NO_RESOURCES:
+ err = ENOBUFS;
+ break;
+ case VMCI_ERROR_INVALID_RESOURCE:
+ err = EHOSTUNREACH;
+ break;
+ case VMCI_ERROR_INVALID_ARGS:
+ default:
+ err = EINVAL;
+ }
+
+ return err > 0 ? -err : err;
+}
+
+static inline void
+vmci_transport_packet_init(struct vmci_transport_packet *pkt,
+ struct sockaddr_vm *src,
+ struct sockaddr_vm *dst,
+ u8 type,
+ u64 size,
+ u64 mode,
+ struct vmci_transport_waiting_info *wait,
+ u16 proto,
+ struct vmci_handle handle)
+{
+ /* We register the stream control handler as an any cid handle so we
+ * must always send from a source address of VMADDR_CID_ANY
+ */
+ pkt->dg.src = vmci_make_handle(VMADDR_CID_ANY,
+ VMCI_TRANSPORT_PACKET_RID);
+ pkt->dg.dst = vmci_make_handle(dst->svm_cid,
+ VMCI_TRANSPORT_PACKET_RID);
+ pkt->dg.payload_size = sizeof(*pkt) - sizeof(pkt->dg);
+ pkt->version = VMCI_TRANSPORT_PACKET_VERSION;
+ pkt->type = type;
+ pkt->src_port = src->svm_port;
+ pkt->dst_port = dst->svm_port;
+ memset(&pkt->proto, 0, sizeof(pkt->proto));
+ memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2));
+
+ switch (pkt->type) {
+ case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
+ pkt->u.size = 0;
+ break;
+
+ case VMCI_TRANSPORT_PACKET_TYPE_REQUEST:
+ case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE:
+ pkt->u.size = size;
+ break;
+
+ case VMCI_TRANSPORT_PACKET_TYPE_OFFER:
+ case VMCI_TRANSPORT_PACKET_TYPE_ATTACH:
+ pkt->u.handle = handle;
+ break;
+
+ case VMCI_TRANSPORT_PACKET_TYPE_WROTE:
+ case VMCI_TRANSPORT_PACKET_TYPE_READ:
+ case VMCI_TRANSPORT_PACKET_TYPE_RST:
+ pkt->u.size = 0;
+ break;
+
+ case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN:
+ pkt->u.mode = mode;
+ break;
+
+ case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ:
+ case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE:
+ memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait));
+ break;
+
+ case VMCI_TRANSPORT_PACKET_TYPE_REQUEST2:
+ case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2:
+ pkt->u.size = size;
+ pkt->proto = proto;
+ break;
+ }
+}
+
+static inline void
+vmci_transport_packet_get_addresses(struct vmci_transport_packet *pkt,
+ struct sockaddr_vm *local,
+ struct sockaddr_vm *remote)
+{
+ vsock_addr_init(local, pkt->dg.dst.context, pkt->dst_port);
+ vsock_addr_init(remote, pkt->dg.src.context, pkt->src_port);
+}
+
+static int
+__vmci_transport_send_control_pkt(struct vmci_transport_packet *pkt,
+ struct sockaddr_vm *src,
+ struct sockaddr_vm *dst,
+ enum vmci_transport_packet_type type,
+ u64 size,
+ u64 mode,
+ struct vmci_transport_waiting_info *wait,
+ u16 proto,
+ struct vmci_handle handle,
+ bool convert_error)
+{
+ int err;
+
+ vmci_transport_packet_init(pkt, src, dst, type, size, mode, wait,
+ proto, handle);
+ err = vmci_datagram_send(&pkt->dg);
+ if (convert_error && (err < 0))
+ return vmci_transport_error_to_vsock_error(err);
+
+ return err;
+}
+
+static int
+vmci_transport_reply_control_pkt_fast(struct vmci_transport_packet *pkt,
+ enum vmci_transport_packet_type type,
+ u64 size,
+ u64 mode,
+ struct vmci_transport_waiting_info *wait,
+ struct vmci_handle handle)
+{
+ struct vmci_transport_packet reply;
+ struct sockaddr_vm src, dst;
+
+ if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) {
+ return 0;
+ } else {
+ vmci_transport_packet_get_addresses(pkt, &src, &dst);
+ return __vmci_transport_send_control_pkt(&reply, &src, &dst,
+ type,
+ size, mode, wait,
+ VSOCK_PROTO_INVALID,
+ handle, true);
+ }
+}
+
+static int
+vmci_transport_send_control_pkt_bh(struct sockaddr_vm *src,
+ struct sockaddr_vm *dst,
+ enum vmci_transport_packet_type type,
+ u64 size,
+ u64 mode,
+ struct vmci_transport_waiting_info *wait,
+ struct vmci_handle handle)
+{
+ /* Note that it is safe to use a single packet across all CPUs since
+ * two tasklets of the same type are guaranteed to not ever run
+ * simultaneously. If that ever changes, or VMCI stops using tasklets,
+ * we can use per-cpu packets.
+ */
+ static struct vmci_transport_packet pkt;
+
+ return __vmci_transport_send_control_pkt(&pkt, src, dst, type,
+ size, mode, wait,
+ VSOCK_PROTO_INVALID, handle,
+ false);
+}
+
+static int
+vmci_transport_send_control_pkt(struct sock *sk,
+ enum vmci_transport_packet_type type,
+ u64 size,
+ u64 mode,
+ struct vmci_transport_waiting_info *wait,
+ u16 proto,
+ struct vmci_handle handle)
+{
+ struct vmci_transport_packet *pkt;
+ struct vsock_sock *vsk;
+ int err;
+
+ vsk = vsock_sk(sk);
+
+ if (!vsock_addr_bound(&vsk->local_addr))
+ return -EINVAL;
+
+ if (!vsock_addr_bound(&vsk->remote_addr))
+ return -EINVAL;
+
+ pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt)
+ return -ENOMEM;
+
+ err = __vmci_transport_send_control_pkt(pkt, &vsk->local_addr,
+ &vsk->remote_addr, type, size,
+ mode, wait, proto, handle,
+ true);
+ kfree(pkt);
+
+ return err;
+}
+
+static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst,
+ struct sockaddr_vm *src,
+ struct vmci_transport_packet *pkt)
+{
+ if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST)
+ return 0;
+ return vmci_transport_send_control_pkt_bh(
+ dst, src,
+ VMCI_TRANSPORT_PACKET_TYPE_RST, 0,
+ 0, NULL, VMCI_INVALID_HANDLE);
+}
+
+static int vmci_transport_send_reset(struct sock *sk,
+ struct vmci_transport_packet *pkt)
+{
+ if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST)
+ return 0;
+ return vmci_transport_send_control_pkt(sk,
+ VMCI_TRANSPORT_PACKET_TYPE_RST,
+ 0, 0, NULL, VSOCK_PROTO_INVALID,
+ VMCI_INVALID_HANDLE);
+}
+
+static int vmci_transport_send_negotiate(struct sock *sk, size_t size)
+{
+ return vmci_transport_send_control_pkt(
+ sk,
+ VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE,
+ size, 0, NULL,
+ VSOCK_PROTO_INVALID,
+ VMCI_INVALID_HANDLE);
+}
+
+static int vmci_transport_send_negotiate2(struct sock *sk, size_t size,
+ u16 version)
+{
+ return vmci_transport_send_control_pkt(
+ sk,
+ VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2,
+ size, 0, NULL, version,
+ VMCI_INVALID_HANDLE);
+}
+
+static int vmci_transport_send_qp_offer(struct sock *sk,
+ struct vmci_handle handle)
+{
+ return vmci_transport_send_control_pkt(
+ sk, VMCI_TRANSPORT_PACKET_TYPE_OFFER, 0,
+ 0, NULL,
+ VSOCK_PROTO_INVALID, handle);
+}
+
+static int vmci_transport_send_attach(struct sock *sk,
+ struct vmci_handle handle)
+{
+ return vmci_transport_send_control_pkt(
+ sk, VMCI_TRANSPORT_PACKET_TYPE_ATTACH,
+ 0, 0, NULL, VSOCK_PROTO_INVALID,
+ handle);
+}
+
+static int vmci_transport_reply_reset(struct vmci_transport_packet *pkt)
+{
+ return vmci_transport_reply_control_pkt_fast(
+ pkt,
+ VMCI_TRANSPORT_PACKET_TYPE_RST,
+ 0, 0, NULL,
+ VMCI_INVALID_HANDLE);
+}
+
+static int vmci_transport_send_invalid_bh(struct sockaddr_vm *dst,
+ struct sockaddr_vm *src)
+{
+ return vmci_transport_send_control_pkt_bh(
+ dst, src,
+ VMCI_TRANSPORT_PACKET_TYPE_INVALID,
+ 0, 0, NULL, VMCI_INVALID_HANDLE);
+}
+
+int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst,
+ struct sockaddr_vm *src)
+{
+ return vmci_transport_send_control_pkt_bh(
+ dst, src,
+ VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0,
+ 0, NULL, VMCI_INVALID_HANDLE);
+}
+
+int vmci_transport_send_read_bh(struct sockaddr_vm *dst,
+ struct sockaddr_vm *src)
+{
+ return vmci_transport_send_control_pkt_bh(
+ dst, src,
+ VMCI_TRANSPORT_PACKET_TYPE_READ, 0,
+ 0, NULL, VMCI_INVALID_HANDLE);
+}
+
+int vmci_transport_send_wrote(struct sock *sk)
+{
+ return vmci_transport_send_control_pkt(
+ sk, VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0,
+ 0, NULL, VSOCK_PROTO_INVALID,
+ VMCI_INVALID_HANDLE);
+}
+
+int vmci_transport_send_read(struct sock *sk)
+{
+ return vmci_transport_send_control_pkt(
+ sk, VMCI_TRANSPORT_PACKET_TYPE_READ, 0,
+ 0, NULL, VSOCK_PROTO_INVALID,
+ VMCI_INVALID_HANDLE);
+}
+
+int vmci_transport_send_waiting_write(struct sock *sk,
+ struct vmci_transport_waiting_info *wait)
+{
+ return vmci_transport_send_control_pkt(
+ sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE,
+ 0, 0, wait, VSOCK_PROTO_INVALID,
+ VMCI_INVALID_HANDLE);
+}
+
+int vmci_transport_send_waiting_read(struct sock *sk,
+ struct vmci_transport_waiting_info *wait)
+{
+ return vmci_transport_send_control_pkt(
+ sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ,
+ 0, 0, wait, VSOCK_PROTO_INVALID,
+ VMCI_INVALID_HANDLE);
+}
+
+static int vmci_transport_shutdown(struct vsock_sock *vsk, int mode)
+{
+ return vmci_transport_send_control_pkt(
+ &vsk->sk,
+ VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN,
+ 0, mode, NULL,
+ VSOCK_PROTO_INVALID,
+ VMCI_INVALID_HANDLE);
+}
+
+static int vmci_transport_send_conn_request(struct sock *sk, size_t size)
+{
+ return vmci_transport_send_control_pkt(sk,
+ VMCI_TRANSPORT_PACKET_TYPE_REQUEST,
+ size, 0, NULL,
+ VSOCK_PROTO_INVALID,
+ VMCI_INVALID_HANDLE);
+}
+
+static int vmci_transport_send_conn_request2(struct sock *sk, size_t size,
+ u16 version)
+{
+ return vmci_transport_send_control_pkt(
+ sk, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2,
+ size, 0, NULL, version,
+ VMCI_INVALID_HANDLE);
+}
+
+static struct sock *vmci_transport_get_pending(
+ struct sock *listener,
+ struct vmci_transport_packet *pkt)
+{
+ struct vsock_sock *vlistener;
+ struct vsock_sock *vpending;
+ struct sock *pending;
+
+ vlistener = vsock_sk(listener);
+
+ list_for_each_entry(vpending, &vlistener->pending_links,
+ pending_links) {
+ struct sockaddr_vm src;
+ struct sockaddr_vm dst;
+
+ vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port);
+ vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port);
+
+ if (vsock_addr_equals_addr(&src, &vpending->remote_addr) &&
+ vsock_addr_equals_addr(&dst, &vpending->local_addr)) {
+ pending = sk_vsock(vpending);
+ sock_hold(pending);
+ goto found;
+ }
+ }
+
+ pending = NULL;
+found:
+ return pending;
+
+}
+
+static void vmci_transport_release_pending(struct sock *pending)
+{
+ sock_put(pending);
+}
+
+/* We allow two kinds of sockets to communicate with a restricted VM: 1)
+ * trusted sockets 2) sockets from applications running as the same user as the
+ * VM (this is only true for the host side and only when using hosted products)
+ */
+
+static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid)
+{
+ return vsock->trusted ||
+ vmci_is_context_owner(peer_cid, vsock->owner->uid);
+}
+
+/* We allow sending datagrams to and receiving datagrams from a restricted VM
+ * only if it is trusted as described in vmci_transport_is_trusted.
+ */
+
+static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid)
+{
+ if (vsock->cached_peer != peer_cid) {
+ vsock->cached_peer = peer_cid;
+ if (!vmci_transport_is_trusted(vsock, peer_cid) &&
+ (vmci_context_get_priv_flags(peer_cid) &
+ VMCI_PRIVILEGE_FLAG_RESTRICTED)) {
+ vsock->cached_peer_allow_dgram = false;
+ } else {
+ vsock->cached_peer_allow_dgram = true;
+ }
+ }
+
+ return vsock->cached_peer_allow_dgram;
+}
+
+static int
+vmci_transport_queue_pair_alloc(struct vmci_qp **qpair,
+ struct vmci_handle *handle,
+ u64 produce_size,
+ u64 consume_size,
+ u32 peer, u32 flags, bool trusted)
+{
+ int err = 0;
+
+ if (trusted) {
+ /* Try to allocate our queue pair as trusted. This will only
+ * work if vsock is running in the host.
+ */
+
+ err = vmci_qpair_alloc(qpair, handle, produce_size,
+ consume_size,
+ peer, flags,
+ VMCI_PRIVILEGE_FLAG_TRUSTED);
+ if (err != VMCI_ERROR_NO_ACCESS)
+ goto out;
+
+ }
+
+ err = vmci_qpair_alloc(qpair, handle, produce_size, consume_size,
+ peer, flags, VMCI_NO_PRIVILEGE_FLAGS);
+out:
+ if (err < 0) {
+ pr_err("Could not attach to queue pair with %d\n",
+ err);
+ err = vmci_transport_error_to_vsock_error(err);
+ }
+
+ return err;
+}
+
+static int
+vmci_transport_datagram_create_hnd(u32 resource_id,
+ u32 flags,
+ vmci_datagram_recv_cb recv_cb,
+ void *client_data,
+ struct vmci_handle *out_handle)
+{
+ int err = 0;
+
+ /* Try to allocate our datagram handler as trusted. This will only work
+ * if vsock is running in the host.
+ */
+
+ err = vmci_datagram_create_handle_priv(resource_id, flags,
+ VMCI_PRIVILEGE_FLAG_TRUSTED,
+ recv_cb,
+ client_data, out_handle);
+
+ if (err == VMCI_ERROR_NO_ACCESS)
+ err = vmci_datagram_create_handle(resource_id, flags,
+ recv_cb, client_data,
+ out_handle);
+
+ return err;
+}
+
+/* This is invoked as part of a tasklet that's scheduled when the VMCI
+ * interrupt fires. This is run in bottom-half context and if it ever needs to
+ * sleep it should defer that work to a work queue.
+ */
+
+static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg)
+{
+ struct sock *sk;
+ size_t size;
+ struct sk_buff *skb;
+ struct vsock_sock *vsk;
+
+ sk = (struct sock *)data;
+
+ /* This handler is privileged when this module is running on the host.
+ * We will get datagrams from all endpoints (even VMs that are in a
+ * restricted context). If we get one from a restricted context then
+ * the destination socket must be trusted.
+ *
+ * NOTE: We access the socket struct without holding the lock here.
+ * This is ok because the field we are interested is never modified
+ * outside of the create and destruct socket functions.
+ */
+ vsk = vsock_sk(sk);
+ if (!vmci_transport_allow_dgram(vsk, dg->src.context))
+ return VMCI_ERROR_NO_ACCESS;
+
+ size = VMCI_DG_SIZE(dg);
+
+ /* Attach the packet to the socket's receive queue as an sk_buff. */
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (skb) {
+ /* sk_receive_skb() will do a sock_put(), so hold here. */
+ sock_hold(sk);
+ skb_put(skb, size);
+ memcpy(skb->data, dg, size);
+ sk_receive_skb(sk, skb, 0);
+ }
+
+ return VMCI_SUCCESS;
+}
+
+static bool vmci_transport_stream_allow(u32 cid, u32 port)
+{
+ static const u32 non_socket_contexts[] = {
+ VMADDR_CID_HYPERVISOR,
+ VMADDR_CID_RESERVED,
+ };
+ int i;
+
+ BUILD_BUG_ON(sizeof(cid) != sizeof(*non_socket_contexts));
+
+ for (i = 0; i < ARRAY_SIZE(non_socket_contexts); i++) {
+ if (cid == non_socket_contexts[i])
+ return false;
+ }
+
+ return true;
+}
+
+/* This is invoked as part of a tasklet that's scheduled when the VMCI
+ * interrupt fires. This is run in bottom-half context but it defers most of
+ * its work to the packet handling work queue.
+ */
+
+static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg)
+{
+ struct sock *sk;
+ struct sockaddr_vm dst;
+ struct sockaddr_vm src;
+ struct vmci_transport_packet *pkt;
+ struct vsock_sock *vsk;
+ bool bh_process_pkt;
+ int err;
+
+ sk = NULL;
+ err = VMCI_SUCCESS;
+ bh_process_pkt = false;
+
+ /* Ignore incoming packets from contexts without sockets, or resources
+ * that aren't vsock implementations.
+ */
+
+ if (!vmci_transport_stream_allow(dg->src.context, -1)
+ || VMCI_TRANSPORT_PACKET_RID != dg->src.resource)
+ return VMCI_ERROR_NO_ACCESS;
+
+ if (VMCI_DG_SIZE(dg) < sizeof(*pkt))
+ /* Drop datagrams that do not contain full VSock packets. */
+ return VMCI_ERROR_INVALID_ARGS;
+
+ pkt = (struct vmci_transport_packet *)dg;
+
+ /* Find the socket that should handle this packet. First we look for a
+ * connected socket and if there is none we look for a socket bound to
+ * the destintation address.
+ */
+ vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port);
+ vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port);
+
+ sk = vsock_find_connected_socket(&src, &dst);
+ if (!sk) {
+ sk = vsock_find_bound_socket(&dst);
+ if (!sk) {
+ /* We could not find a socket for this specified
+ * address. If this packet is a RST, we just drop it.
+ * If it is another packet, we send a RST. Note that
+ * we do not send a RST reply to RSTs so that we do not
+ * continually send RSTs between two endpoints.
+ *
+ * Note that since this is a reply, dst is src and src
+ * is dst.
+ */
+ if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0)
+ pr_err("unable to send reset\n");
+
+ err = VMCI_ERROR_NOT_FOUND;
+ goto out;
+ }
+ }
+
+ /* If the received packet type is beyond all types known to this
+ * implementation, reply with an invalid message. Hopefully this will
+ * help when implementing backwards compatibility in the future.
+ */
+ if (pkt->type >= VMCI_TRANSPORT_PACKET_TYPE_MAX) {
+ vmci_transport_send_invalid_bh(&dst, &src);
+ err = VMCI_ERROR_INVALID_ARGS;
+ goto out;
+ }
+
+ /* This handler is privileged when this module is running on the host.
+ * We will get datagram connect requests from all endpoints (even VMs
+ * that are in a restricted context). If we get one from a restricted
+ * context then the destination socket must be trusted.
+ *
+ * NOTE: We access the socket struct without holding the lock here.
+ * This is ok because the field we are interested is never modified
+ * outside of the create and destruct socket functions.
+ */
+ vsk = vsock_sk(sk);
+ if (!vmci_transport_allow_dgram(vsk, pkt->dg.src.context)) {
+ err = VMCI_ERROR_NO_ACCESS;
+ goto out;
+ }
+
+ /* We do most everything in a work queue, but let's fast path the
+ * notification of reads and writes to help data transfer performance.
+ * We can only do this if there is no process context code executing
+ * for this socket since that may change the state.
+ */
+ bh_lock_sock(sk);
+
+ if (!sock_owned_by_user(sk) && sk->sk_state == SS_CONNECTED)
+ vmci_trans(vsk)->notify_ops->handle_notify_pkt(
+ sk, pkt, true, &dst, &src,
+ &bh_process_pkt);
+
+ bh_unlock_sock(sk);
+
+ if (!bh_process_pkt) {
+ struct vmci_transport_recv_pkt_info *recv_pkt_info;
+
+ recv_pkt_info = kmalloc(sizeof(*recv_pkt_info), GFP_ATOMIC);
+ if (!recv_pkt_info) {
+ if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0)
+ pr_err("unable to send reset\n");
+
+ err = VMCI_ERROR_NO_MEM;
+ goto out;
+ }
+
+ recv_pkt_info->sk = sk;
+ memcpy(&recv_pkt_info->pkt, pkt, sizeof(recv_pkt_info->pkt));
+ INIT_WORK(&recv_pkt_info->work, vmci_transport_recv_pkt_work);
+
+ schedule_work(&recv_pkt_info->work);
+ /* Clear sk so that the reference count incremented by one of
+ * the Find functions above is not decremented below. We need
+ * that reference count for the packet handler we've scheduled
+ * to run.
+ */
+ sk = NULL;
+ }
+
+out:
+ if (sk)
+ sock_put(sk);
+
+ return err;
+}
+
+static void vmci_transport_peer_attach_cb(u32 sub_id,
+ const struct vmci_event_data *e_data,
+ void *client_data)
+{
+ struct sock *sk = client_data;
+ const struct vmci_event_payload_qp *e_payload;
+ struct vsock_sock *vsk;
+
+ e_payload = vmci_event_data_const_payload(e_data);
+
+ vsk = vsock_sk(sk);
+
+ /* We don't ask for delayed CBs when we subscribe to this event (we
+ * pass 0 as flags to vmci_event_subscribe()). VMCI makes no
+ * guarantees in that case about what context we might be running in,
+ * so it could be BH or process, blockable or non-blockable. So we
+ * need to account for all possible contexts here.
+ */
+ local_bh_disable();
+ bh_lock_sock(sk);
+
+ /* XXX This is lame, we should provide a way to lookup sockets by
+ * qp_handle.
+ */
+ if (vmci_handle_is_equal(vmci_trans(vsk)->qp_handle,
+ e_payload->handle)) {
+ /* XXX This doesn't do anything, but in the future we may want
+ * to set a flag here to verify the attach really did occur and
+ * we weren't just sent a datagram claiming it was.
+ */
+ goto out;
+ }
+
+out:
+ bh_unlock_sock(sk);
+ local_bh_enable();
+}
+
+static void vmci_transport_handle_detach(struct sock *sk)
+{
+ struct vsock_sock *vsk;
+
+ vsk = vsock_sk(sk);
+ if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) {
+ sock_set_flag(sk, SOCK_DONE);
+
+ /* On a detach the peer will not be sending or receiving
+ * anymore.
+ */
+ vsk->peer_shutdown = SHUTDOWN_MASK;
+
+ /* We should not be sending anymore since the peer won't be
+ * there to receive, but we can still receive if there is data
+ * left in our consume queue.
+ */
+ if (vsock_stream_has_data(vsk) <= 0) {
+ if (sk->sk_state == SS_CONNECTING) {
+ /* The peer may detach from a queue pair while
+ * we are still in the connecting state, i.e.,
+ * if the peer VM is killed after attaching to
+ * a queue pair, but before we complete the
+ * handshake. In that case, we treat the detach
+ * event like a reset.
+ */
+
+ sk->sk_state = SS_UNCONNECTED;
+ sk->sk_err = ECONNRESET;
+ sk->sk_error_report(sk);
+ return;
+ }
+ sk->sk_state = SS_UNCONNECTED;
+ }
+ sk->sk_state_change(sk);
+ }
+}
+
+static void vmci_transport_peer_detach_cb(u32 sub_id,
+ const struct vmci_event_data *e_data,
+ void *client_data)
+{
+ struct sock *sk = client_data;
+ const struct vmci_event_payload_qp *e_payload;
+ struct vsock_sock *vsk;
+
+ e_payload = vmci_event_data_const_payload(e_data);
+ vsk = vsock_sk(sk);
+ if (vmci_handle_is_invalid(e_payload->handle))
+ return;
+
+ /* Same rules for locking as for peer_attach_cb(). */
+ local_bh_disable();
+ bh_lock_sock(sk);
+
+ /* XXX This is lame, we should provide a way to lookup sockets by
+ * qp_handle.
+ */
+ if (vmci_handle_is_equal(vmci_trans(vsk)->qp_handle,
+ e_payload->handle))
+ vmci_transport_handle_detach(sk);
+
+ bh_unlock_sock(sk);
+ local_bh_enable();
+}
+
+static void vmci_transport_qp_resumed_cb(u32 sub_id,
+ const struct vmci_event_data *e_data,
+ void *client_data)
+{
+ vsock_for_each_connected_socket(vmci_transport_handle_detach);
+}
+
+static void vmci_transport_recv_pkt_work(struct work_struct *work)
+{
+ struct vmci_transport_recv_pkt_info *recv_pkt_info;
+ struct vmci_transport_packet *pkt;
+ struct sock *sk;
+
+ recv_pkt_info =
+ container_of(work, struct vmci_transport_recv_pkt_info, work);
+ sk = recv_pkt_info->sk;
+ pkt = &recv_pkt_info->pkt;
+
+ lock_sock(sk);
+
+ switch (sk->sk_state) {
+ case SS_LISTEN:
+ vmci_transport_recv_listen(sk, pkt);
+ break;
+ case SS_CONNECTING:
+ /* Processing of pending connections for servers goes through
+ * the listening socket, so see vmci_transport_recv_listen()
+ * for that path.
+ */
+ vmci_transport_recv_connecting_client(sk, pkt);
+ break;
+ case SS_CONNECTED:
+ vmci_transport_recv_connected(sk, pkt);
+ break;
+ default:
+ /* Because this function does not run in the same context as
+ * vmci_transport_recv_stream_cb it is possible that the
+ * socket has closed. We need to let the other side know or it
+ * could be sitting in a connect and hang forever. Send a
+ * reset to prevent that.
+ */
+ vmci_transport_send_reset(sk, pkt);
+ goto out;
+ }
+
+out:
+ release_sock(sk);
+ kfree(recv_pkt_info);
+ /* Release reference obtained in the stream callback when we fetched
+ * this socket out of the bound or connected list.
+ */
+ sock_put(sk);
+}
+
+static int vmci_transport_recv_listen(struct sock *sk,
+ struct vmci_transport_packet *pkt)
+{
+ struct sock *pending;
+ struct vsock_sock *vpending;
+ int err;
+ u64 qp_size;
+ bool old_request = false;
+ bool old_pkt_proto = false;
+
+ err = 0;
+
+ /* Because we are in the listen state, we could be receiving a packet
+ * for ourself or any previous connection requests that we received.
+ * If it's the latter, we try to find a socket in our list of pending
+ * connections and, if we do, call the appropriate handler for the
+ * state that that socket is in. Otherwise we try to service the
+ * connection request.
+ */
+ pending = vmci_transport_get_pending(sk, pkt);
+ if (pending) {
+ lock_sock(pending);
+ switch (pending->sk_state) {
+ case SS_CONNECTING:
+ err = vmci_transport_recv_connecting_server(sk,
+ pending,
+ pkt);
+ break;
+ default:
+ vmci_transport_send_reset(pending, pkt);
+ err = -EINVAL;
+ }
+
+ if (err < 0)
+ vsock_remove_pending(sk, pending);
+
+ release_sock(pending);
+ vmci_transport_release_pending(pending);
+
+ return err;
+ }
+
+ /* The listen state only accepts connection requests. Reply with a
+ * reset unless we received a reset.
+ */
+
+ if (!(pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST ||
+ pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)) {
+ vmci_transport_reply_reset(pkt);
+ return -EINVAL;
+ }
+
+ if (pkt->u.size == 0) {
+ vmci_transport_reply_reset(pkt);
+ return -EINVAL;
+ }
+
+ /* If this socket can't accommodate this connection request, we send a
+ * reset. Otherwise we create and initialize a child socket and reply
+ * with a connection negotiation.
+ */
+ if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) {
+ vmci_transport_reply_reset(pkt);
+ return -ECONNREFUSED;
+ }
+
+ pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
+ sk->sk_type);
+ if (!pending) {
+ vmci_transport_send_reset(sk, pkt);
+ return -ENOMEM;
+ }
+
+ vpending = vsock_sk(pending);
+
+ vsock_addr_init(&vpending->local_addr, pkt->dg.dst.context,
+ pkt->dst_port);
+ vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context,
+ pkt->src_port);
+
+ /* If the proposed size fits within our min/max, accept it. Otherwise
+ * propose our own size.
+ */
+ if (pkt->u.size >= vmci_trans(vpending)->queue_pair_min_size &&
+ pkt->u.size <= vmci_trans(vpending)->queue_pair_max_size) {
+ qp_size = pkt->u.size;
+ } else {
+ qp_size = vmci_trans(vpending)->queue_pair_size;
+ }
+
+ /* Figure out if we are using old or new requests based on the
+ * overrides pkt types sent by our peer.
+ */
+ if (vmci_transport_old_proto_override(&old_pkt_proto)) {
+ old_request = old_pkt_proto;
+ } else {
+ if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST)
+ old_request = true;
+ else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)
+ old_request = false;
+
+ }
+
+ if (old_request) {
+ /* Handle a REQUEST (or override) */
+ u16 version = VSOCK_PROTO_INVALID;
+ if (vmci_transport_proto_to_notify_struct(
+ pending, &version, true))
+ err = vmci_transport_send_negotiate(pending, qp_size);
+ else
+ err = -EINVAL;
+
+ } else {
+ /* Handle a REQUEST2 (or override) */
+ int proto_int = pkt->proto;
+ int pos;
+ u16 active_proto_version = 0;
+
+ /* The list of possible protocols is the intersection of all
+ * protocols the client supports ... plus all the protocols we
+ * support.
+ */
+ proto_int &= vmci_transport_new_proto_supported_versions();
+
+ /* We choose the highest possible protocol version and use that
+ * one.
+ */
+ pos = fls(proto_int);
+ if (pos) {
+ active_proto_version = (1 << (pos - 1));
+ if (vmci_transport_proto_to_notify_struct(
+ pending, &active_proto_version, false))
+ err = vmci_transport_send_negotiate2(pending,
+ qp_size,
+ active_proto_version);
+ else
+ err = -EINVAL;
+
+ } else {
+ err = -EINVAL;
+ }
+ }
+
+ if (err < 0) {
+ vmci_transport_send_reset(sk, pkt);
+ sock_put(pending);
+ err = vmci_transport_error_to_vsock_error(err);
+ goto out;
+ }
+
+ vsock_add_pending(sk, pending);
+ sk->sk_ack_backlog++;
+
+ pending->sk_state = SS_CONNECTING;
+ vmci_trans(vpending)->produce_size =
+ vmci_trans(vpending)->consume_size = qp_size;
+ vmci_trans(vpending)->queue_pair_size = qp_size;
+
+ vmci_trans(vpending)->notify_ops->process_request(pending);
+
+ /* We might never receive another message for this socket and it's not
+ * connected to any process, so we have to ensure it gets cleaned up
+ * ourself. Our delayed work function will take care of that. Note
+ * that we do not ever cancel this function since we have few
+ * guarantees about its state when calling cancel_delayed_work().
+ * Instead we hold a reference on the socket for that function and make
+ * it capable of handling cases where it needs to do nothing but
+ * release that reference.
+ */
+ vpending->listener = sk;
+ sock_hold(sk);
+ sock_hold(pending);
+ INIT_DELAYED_WORK(&vpending->dwork, vsock_pending_work);
+ schedule_delayed_work(&vpending->dwork, HZ);
+
+out:
+ return err;
+}
+
+static int
+vmci_transport_recv_connecting_server(struct sock *listener,
+ struct sock *pending,
+ struct vmci_transport_packet *pkt)
+{
+ struct vsock_sock *vpending;
+ struct vmci_handle handle;
+ struct vmci_qp *qpair;
+ bool is_local;
+ u32 flags;
+ u32 detach_sub_id;
+ int err;
+ int skerr;
+
+ vpending = vsock_sk(pending);
+ detach_sub_id = VMCI_INVALID_ID;
+
+ switch (pkt->type) {
+ case VMCI_TRANSPORT_PACKET_TYPE_OFFER:
+ if (vmci_handle_is_invalid(pkt->u.handle)) {
+ vmci_transport_send_reset(pending, pkt);
+ skerr = EPROTO;
+ err = -EINVAL;
+ goto destroy;
+ }
+ break;
+ default:
+ /* Close and cleanup the connection. */
+ vmci_transport_send_reset(pending, pkt);
+ skerr = EPROTO;
+ err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL;
+ goto destroy;
+ }
+
+ /* In order to complete the connection we need to attach to the offered
+ * queue pair and send an attach notification. We also subscribe to the
+ * detach event so we know when our peer goes away, and we do that
+ * before attaching so we don't miss an event. If all this succeeds,
+ * we update our state and wakeup anything waiting in accept() for a
+ * connection.
+ */
+
+ /* We don't care about attach since we ensure the other side has
+ * attached by specifying the ATTACH_ONLY flag below.
+ */
+ err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH,
+ vmci_transport_peer_detach_cb,
+ pending, &detach_sub_id);
+ if (err < VMCI_SUCCESS) {
+ vmci_transport_send_reset(pending, pkt);
+ err = vmci_transport_error_to_vsock_error(err);
+ skerr = -err;
+ goto destroy;
+ }
+
+ vmci_trans(vpending)->detach_sub_id = detach_sub_id;
+
+ /* Now attach to the queue pair the client created. */
+ handle = pkt->u.handle;
+
+ /* vpending->local_addr always has a context id so we do not need to
+ * worry about VMADDR_CID_ANY in this case.
+ */
+ is_local =
+ vpending->remote_addr.svm_cid == vpending->local_addr.svm_cid;
+ flags = VMCI_QPFLAG_ATTACH_ONLY;
+ flags |= is_local ? VMCI_QPFLAG_LOCAL : 0;
+
+ err = vmci_transport_queue_pair_alloc(
+ &qpair,
+ &handle,
+ vmci_trans(vpending)->produce_size,
+ vmci_trans(vpending)->consume_size,
+ pkt->dg.src.context,
+ flags,
+ vmci_transport_is_trusted(
+ vpending,
+ vpending->remote_addr.svm_cid));
+ if (err < 0) {
+ vmci_transport_send_reset(pending, pkt);
+ skerr = -err;
+ goto destroy;
+ }
+
+ vmci_trans(vpending)->qp_handle = handle;
+ vmci_trans(vpending)->qpair = qpair;
+
+ /* When we send the attach message, we must be ready to handle incoming
+ * control messages on the newly connected socket. So we move the
+ * pending socket to the connected state before sending the attach
+ * message. Otherwise, an incoming packet triggered by the attach being
+ * received by the peer may be processed concurrently with what happens
+ * below after sending the attach message, and that incoming packet
+ * will find the listening socket instead of the (currently) pending
+ * socket. Note that enqueueing the socket increments the reference
+ * count, so even if a reset comes before the connection is accepted,
+ * the socket will be valid until it is removed from the queue.
+ *
+ * If we fail sending the attach below, we remove the socket from the
+ * connected list and move the socket to SS_UNCONNECTED before
+ * releasing the lock, so a pending slow path processing of an incoming
+ * packet will not see the socket in the connected state in that case.
+ */
+ pending->sk_state = SS_CONNECTED;
+
+ vsock_insert_connected(vpending);
+
+ /* Notify our peer of our attach. */
+ err = vmci_transport_send_attach(pending, handle);
+ if (err < 0) {
+ vsock_remove_connected(vpending);
+ pr_err("Could not send attach\n");
+ vmci_transport_send_reset(pending, pkt);
+ err = vmci_transport_error_to_vsock_error(err);
+ skerr = -err;
+ goto destroy;
+ }
+
+ /* We have a connection. Move the now connected socket from the
+ * listener's pending list to the accept queue so callers of accept()
+ * can find it.
+ */
+ vsock_remove_pending(listener, pending);
+ vsock_enqueue_accept(listener, pending);
+
+ /* Callers of accept() will be be waiting on the listening socket, not
+ * the pending socket.
+ */
+ listener->sk_state_change(listener);
+
+ return 0;
+
+destroy:
+ pending->sk_err = skerr;
+ pending->sk_state = SS_UNCONNECTED;
+ /* As long as we drop our reference, all necessary cleanup will handle
+ * when the cleanup function drops its reference and our destruct
+ * implementation is called. Note that since the listen handler will
+ * remove pending from the pending list upon our failure, the cleanup
+ * function won't drop the additional reference, which is why we do it
+ * here.
+ */
+ sock_put(pending);
+
+ return err;
+}
+
+static int
+vmci_transport_recv_connecting_client(struct sock *sk,
+ struct vmci_transport_packet *pkt)
+{
+ struct vsock_sock *vsk;
+ int err;
+ int skerr;
+
+ vsk = vsock_sk(sk);
+
+ switch (pkt->type) {
+ case VMCI_TRANSPORT_PACKET_TYPE_ATTACH:
+ if (vmci_handle_is_invalid(pkt->u.handle) ||
+ !vmci_handle_is_equal(pkt->u.handle,
+ vmci_trans(vsk)->qp_handle)) {
+ skerr = EPROTO;
+ err = -EINVAL;
+ goto destroy;
+ }
+
+ /* Signify the socket is connected and wakeup the waiter in
+ * connect(). Also place the socket in the connected table for
+ * accounting (it can already be found since it's in the bound
+ * table).
+ */
+ sk->sk_state = SS_CONNECTED;
+ sk->sk_socket->state = SS_CONNECTED;
+ vsock_insert_connected(vsk);
+ sk->sk_state_change(sk);
+
+ break;
+ case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE:
+ case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2:
+ if (pkt->u.size == 0
+ || pkt->dg.src.context != vsk->remote_addr.svm_cid
+ || pkt->src_port != vsk->remote_addr.svm_port
+ || !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)
+ || vmci_trans(vsk)->qpair
+ || vmci_trans(vsk)->produce_size != 0
+ || vmci_trans(vsk)->consume_size != 0
+ || vmci_trans(vsk)->attach_sub_id != VMCI_INVALID_ID
+ || vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) {
+ skerr = EPROTO;
+ err = -EINVAL;
+
+ goto destroy;
+ }
+
+ err = vmci_transport_recv_connecting_client_negotiate(sk, pkt);
+ if (err) {
+ skerr = -err;
+ goto destroy;
+ }
+
+ break;
+ case VMCI_TRANSPORT_PACKET_TYPE_INVALID:
+ err = vmci_transport_recv_connecting_client_invalid(sk, pkt);
+ if (err) {
+ skerr = -err;
+ goto destroy;
+ }
+
+ break;
+ case VMCI_TRANSPORT_PACKET_TYPE_RST:
+ /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to
+ * continue processing here after they sent an INVALID packet.
+ * This meant that we got a RST after the INVALID. We ignore a
+ * RST after an INVALID. The common code doesn't send the RST
+ * ... so we can hang if an old version of the common code
+ * fails between getting a REQUEST and sending an OFFER back.
+ * Not much we can do about it... except hope that it doesn't
+ * happen.
+ */
+ if (vsk->ignore_connecting_rst) {
+ vsk->ignore_connecting_rst = false;
+ } else {
+ skerr = ECONNRESET;
+ err = 0;
+ goto destroy;
+ }
+
+ break;
+ default:
+ /* Close and cleanup the connection. */
+ skerr = EPROTO;
+ err = -EINVAL;
+ goto destroy;
+ }
+
+ return 0;
+
+destroy:
+ vmci_transport_send_reset(sk, pkt);
+
+ sk->sk_state = SS_UNCONNECTED;
+ sk->sk_err = skerr;
+ sk->sk_error_report(sk);
+ return err;
+}
+
+static int vmci_transport_recv_connecting_client_negotiate(
+ struct sock *sk,
+ struct vmci_transport_packet *pkt)
+{
+ int err;
+ struct vsock_sock *vsk;
+ struct vmci_handle handle;
+ struct vmci_qp *qpair;
+ u32 attach_sub_id;
+ u32 detach_sub_id;
+ bool is_local;
+ u32 flags;
+ bool old_proto = true;
+ bool old_pkt_proto;
+ u16 version;
+
+ vsk = vsock_sk(sk);
+ handle = VMCI_INVALID_HANDLE;
+ attach_sub_id = VMCI_INVALID_ID;
+ detach_sub_id = VMCI_INVALID_ID;
+
+ /* If we have gotten here then we should be past the point where old
+ * linux vsock could have sent the bogus rst.
+ */
+ vsk->sent_request = false;
+ vsk->ignore_connecting_rst = false;
+
+ /* Verify that we're OK with the proposed queue pair size */
+ if (pkt->u.size < vmci_trans(vsk)->queue_pair_min_size ||
+ pkt->u.size > vmci_trans(vsk)->queue_pair_max_size) {
+ err = -EINVAL;
+ goto destroy;
+ }
+
+ /* At this point we know the CID the peer is using to talk to us. */
+
+ if (vsk->local_addr.svm_cid == VMADDR_CID_ANY)
+ vsk->local_addr.svm_cid = pkt->dg.dst.context;
+
+ /* Setup the notify ops to be the highest supported version that both
+ * the server and the client support.
+ */
+
+ if (vmci_transport_old_proto_override(&old_pkt_proto)) {
+ old_proto = old_pkt_proto;
+ } else {
+ if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE)
+ old_proto = true;
+ else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2)
+ old_proto = false;
+
+ }
+
+ if (old_proto)
+ version = VSOCK_PROTO_INVALID;
+ else
+ version = pkt->proto;
+
+ if (!vmci_transport_proto_to_notify_struct(sk, &version, old_proto)) {
+ err = -EINVAL;
+ goto destroy;
+ }
+
+ /* Subscribe to attach and detach events first.
+ *
+ * XXX We attach once for each queue pair created for now so it is easy
+ * to find the socket (it's provided), but later we should only
+ * subscribe once and add a way to lookup sockets by queue pair handle.
+ */
+ err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_ATTACH,
+ vmci_transport_peer_attach_cb,
+ sk, &attach_sub_id);
+ if (err < VMCI_SUCCESS) {
+ err = vmci_transport_error_to_vsock_error(err);
+ goto destroy;
+ }
+
+ err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH,
+ vmci_transport_peer_detach_cb,
+ sk, &detach_sub_id);
+ if (err < VMCI_SUCCESS) {
+ err = vmci_transport_error_to_vsock_error(err);
+ goto destroy;
+ }
+
+ /* Make VMCI select the handle for us. */
+ handle = VMCI_INVALID_HANDLE;
+ is_local = vsk->remote_addr.svm_cid == vsk->local_addr.svm_cid;
+ flags = is_local ? VMCI_QPFLAG_LOCAL : 0;
+
+ err = vmci_transport_queue_pair_alloc(&qpair,
+ &handle,
+ pkt->u.size,
+ pkt->u.size,
+ vsk->remote_addr.svm_cid,
+ flags,
+ vmci_transport_is_trusted(
+ vsk,
+ vsk->
+ remote_addr.svm_cid));
+ if (err < 0)
+ goto destroy;
+
+ err = vmci_transport_send_qp_offer(sk, handle);
+ if (err < 0) {
+ err = vmci_transport_error_to_vsock_error(err);
+ goto destroy;
+ }
+
+ vmci_trans(vsk)->qp_handle = handle;
+ vmci_trans(vsk)->qpair = qpair;
+
+ vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size =
+ pkt->u.size;
+
+ vmci_trans(vsk)->attach_sub_id = attach_sub_id;
+ vmci_trans(vsk)->detach_sub_id = detach_sub_id;
+
+ vmci_trans(vsk)->notify_ops->process_negotiate(sk);
+
+ return 0;
+
+destroy:
+ if (attach_sub_id != VMCI_INVALID_ID)
+ vmci_event_unsubscribe(attach_sub_id);
+
+ if (detach_sub_id != VMCI_INVALID_ID)
+ vmci_event_unsubscribe(detach_sub_id);
+
+ if (!vmci_handle_is_invalid(handle))
+ vmci_qpair_detach(&qpair);
+
+ return err;
+}
+
+static int
+vmci_transport_recv_connecting_client_invalid(struct sock *sk,
+ struct vmci_transport_packet *pkt)
+{
+ int err = 0;
+ struct vsock_sock *vsk = vsock_sk(sk);
+
+ if (vsk->sent_request) {
+ vsk->sent_request = false;
+ vsk->ignore_connecting_rst = true;
+
+ err = vmci_transport_send_conn_request(
+ sk, vmci_trans(vsk)->queue_pair_size);
+ if (err < 0)
+ err = vmci_transport_error_to_vsock_error(err);
+ else
+ err = 0;
+
+ }
+
+ return err;
+}
+
+static int vmci_transport_recv_connected(struct sock *sk,
+ struct vmci_transport_packet *pkt)
+{
+ struct vsock_sock *vsk;
+ bool pkt_processed = false;
+
+ /* In cases where we are closing the connection, it's sufficient to
+ * mark the state change (and maybe error) and wake up any waiting
+ * threads. Since this is a connected socket, it's owned by a user
+ * process and will be cleaned up when the failure is passed back on
+ * the current or next system call. Our system call implementations
+ * must therefore check for error and state changes on entry and when
+ * being awoken.
+ */
+ switch (pkt->type) {
+ case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN:
+ if (pkt->u.mode) {
+ vsk = vsock_sk(sk);
+
+ vsk->peer_shutdown |= pkt->u.mode;
+ sk->sk_state_change(sk);
+ }
+ break;
+
+ case VMCI_TRANSPORT_PACKET_TYPE_RST:
+ vsk = vsock_sk(sk);
+ /* It is possible that we sent our peer a message (e.g a
+ * WAITING_READ) right before we got notified that the peer had
+ * detached. If that happens then we can get a RST pkt back
+ * from our peer even though there is data available for us to
+ * read. In that case, don't shutdown the socket completely but
+ * instead allow the local client to finish reading data off
+ * the queuepair. Always treat a RST pkt in connected mode like
+ * a clean shutdown.
+ */
+ sock_set_flag(sk, SOCK_DONE);
+ vsk->peer_shutdown = SHUTDOWN_MASK;
+ if (vsock_stream_has_data(vsk) <= 0)
+ sk->sk_state = SS_DISCONNECTING;
+
+ sk->sk_state_change(sk);
+ break;
+
+ default:
+ vsk = vsock_sk(sk);
+ vmci_trans(vsk)->notify_ops->handle_notify_pkt(
+ sk, pkt, false, NULL, NULL,
+ &pkt_processed);
+ if (!pkt_processed)
+ return -EINVAL;
+
+ break;
+ }
+
+ return 0;
+}
+
+static int vmci_transport_socket_init(struct vsock_sock *vsk,
+ struct vsock_sock *psk)
+{
+ vsk->trans = kmalloc(sizeof(struct vmci_transport), GFP_KERNEL);
+ if (!vsk->trans)
+ return -ENOMEM;
+
+ vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE;
+ vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE;
+ vmci_trans(vsk)->qpair = NULL;
+ vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 0;
+ vmci_trans(vsk)->attach_sub_id = vmci_trans(vsk)->detach_sub_id =
+ VMCI_INVALID_ID;
+ vmci_trans(vsk)->notify_ops = NULL;
+ if (psk) {
+ vmci_trans(vsk)->queue_pair_size =
+ vmci_trans(psk)->queue_pair_size;
+ vmci_trans(vsk)->queue_pair_min_size =
+ vmci_trans(psk)->queue_pair_min_size;
+ vmci_trans(vsk)->queue_pair_max_size =
+ vmci_trans(psk)->queue_pair_max_size;
+ } else {
+ vmci_trans(vsk)->queue_pair_size =
+ VMCI_TRANSPORT_DEFAULT_QP_SIZE;
+ vmci_trans(vsk)->queue_pair_min_size =
+ VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN;
+ vmci_trans(vsk)->queue_pair_max_size =
+ VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX;
+ }
+
+ return 0;
+}
+
+static void vmci_transport_destruct(struct vsock_sock *vsk)
+{
+ if (vmci_trans(vsk)->attach_sub_id != VMCI_INVALID_ID) {
+ vmci_event_unsubscribe(vmci_trans(vsk)->attach_sub_id);
+ vmci_trans(vsk)->attach_sub_id = VMCI_INVALID_ID;
+ }
+
+ if (vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) {
+ vmci_event_unsubscribe(vmci_trans(vsk)->detach_sub_id);
+ vmci_trans(vsk)->detach_sub_id = VMCI_INVALID_ID;
+ }
+
+ if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) {
+ vmci_qpair_detach(&vmci_trans(vsk)->qpair);
+ vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE;
+ vmci_trans(vsk)->produce_size = 0;
+ vmci_trans(vsk)->consume_size = 0;
+ }
+
+ if (vmci_trans(vsk)->notify_ops)
+ vmci_trans(vsk)->notify_ops->socket_destruct(vsk);
+
+ kfree(vsk->trans);
+ vsk->trans = NULL;
+}
+
+static void vmci_transport_release(struct vsock_sock *vsk)
+{
+ if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) {
+ vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle);
+ vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE;
+ }
+}
+
+static int vmci_transport_dgram_bind(struct vsock_sock *vsk,
+ struct sockaddr_vm *addr)
+{
+ u32 port;
+ u32 flags;
+ int err;
+
+ /* VMCI will select a resource ID for us if we provide
+ * VMCI_INVALID_ID.
+ */
+ port = addr->svm_port == VMADDR_PORT_ANY ?
+ VMCI_INVALID_ID : addr->svm_port;
+
+ if (port <= LAST_RESERVED_PORT && !capable(CAP_NET_BIND_SERVICE))
+ return -EACCES;
+
+ flags = addr->svm_cid == VMADDR_CID_ANY ?
+ VMCI_FLAG_ANYCID_DG_HND : 0;
+
+ err = vmci_transport_datagram_create_hnd(port, flags,
+ vmci_transport_recv_dgram_cb,
+ &vsk->sk,
+ &vmci_trans(vsk)->dg_handle);
+ if (err < VMCI_SUCCESS)
+ return vmci_transport_error_to_vsock_error(err);
+ vsock_addr_init(&vsk->local_addr, addr->svm_cid,
+ vmci_trans(vsk)->dg_handle.resource);
+
+ return 0;
+}
+
+static int vmci_transport_dgram_enqueue(
+ struct vsock_sock *vsk,
+ struct sockaddr_vm *remote_addr,
+ struct iovec *iov,
+ size_t len)
+{
+ int err;
+ struct vmci_datagram *dg;
+
+ if (len > VMCI_MAX_DG_PAYLOAD_SIZE)
+ return -EMSGSIZE;
+
+ if (!vmci_transport_allow_dgram(vsk, remote_addr->svm_cid))
+ return -EPERM;
+
+ /* Allocate a buffer for the user's message and our packet header. */
+ dg = kmalloc(len + sizeof(*dg), GFP_KERNEL);
+ if (!dg)
+ return -ENOMEM;
+
+ memcpy_fromiovec(VMCI_DG_PAYLOAD(dg), iov, len);
+
+ dg->dst = vmci_make_handle(remote_addr->svm_cid,
+ remote_addr->svm_port);
+ dg->src = vmci_make_handle(vsk->local_addr.svm_cid,
+ vsk->local_addr.svm_port);
+ dg->payload_size = len;
+
+ err = vmci_datagram_send(dg);
+ kfree(dg);
+ if (err < 0)
+ return vmci_transport_error_to_vsock_error(err);
+
+ return err - sizeof(*dg);
+}
+
+static int vmci_transport_dgram_dequeue(struct kiocb *kiocb,
+ struct vsock_sock *vsk,
+ struct msghdr *msg, size_t len,
+ int flags)
+{
+ int err;
+ int noblock;
+ struct vmci_datagram *dg;
+ size_t payload_len;
+ struct sk_buff *skb;
+
+ noblock = flags & MSG_DONTWAIT;
+
+ if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
+ return -EOPNOTSUPP;
+
+ /* Retrieve the head sk_buff from the socket's receive queue. */
+ err = 0;
+ skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err);
+ if (err)
+ return err;
+
+ if (!skb)
+ return -EAGAIN;
+
+ dg = (struct vmci_datagram *)skb->data;
+ if (!dg)
+ /* err is 0, meaning we read zero bytes. */
+ goto out;
+
+ payload_len = dg->payload_size;
+ /* Ensure the sk_buff matches the payload size claimed in the packet. */
+ if (payload_len != skb->len - sizeof(*dg)) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (payload_len > len) {
+ payload_len = len;
+ msg->msg_flags |= MSG_TRUNC;
+ }
+
+ /* Place the datagram payload in the user's iovec. */
+ err = skb_copy_datagram_iovec(skb, sizeof(*dg), msg->msg_iov,
+ payload_len);
+ if (err)
+ goto out;
+
+ msg->msg_namelen = 0;
+ if (msg->msg_name) {
+ struct sockaddr_vm *vm_addr;
+
+ /* Provide the address of the sender. */
+ vm_addr = (struct sockaddr_vm *)msg->msg_name;
+ vsock_addr_init(vm_addr, dg->src.context, dg->src.resource);
+ msg->msg_namelen = sizeof(*vm_addr);
+ }
+ err = payload_len;
+
+out:
+ skb_free_datagram(&vsk->sk, skb);
+ return err;
+}
+
+static bool vmci_transport_dgram_allow(u32 cid, u32 port)
+{
+ if (cid == VMADDR_CID_HYPERVISOR) {
+ /* Registrations of PBRPC Servers do not modify VMX/Hypervisor
+ * state and are allowed.
+ */
+ return port == VMCI_UNITY_PBRPC_REGISTER;
+ }
+
+ return true;
+}
+
+static int vmci_transport_connect(struct vsock_sock *vsk)
+{
+ int err;
+ bool old_pkt_proto = false;
+ struct sock *sk = &vsk->sk;
+
+ if (vmci_transport_old_proto_override(&old_pkt_proto) &&
+ old_pkt_proto) {
+ err = vmci_transport_send_conn_request(
+ sk, vmci_trans(vsk)->queue_pair_size);
+ if (err < 0) {
+ sk->sk_state = SS_UNCONNECTED;
+ return err;
+ }
+ } else {
+ int supported_proto_versions =
+ vmci_transport_new_proto_supported_versions();
+ err = vmci_transport_send_conn_request2(
+ sk, vmci_trans(vsk)->queue_pair_size,
+ supported_proto_versions);
+ if (err < 0) {
+ sk->sk_state = SS_UNCONNECTED;
+ return err;
+ }
+
+ vsk->sent_request = true;
+ }
+
+ return err;
+}
+
+static ssize_t vmci_transport_stream_dequeue(
+ struct vsock_sock *vsk,
+ struct iovec *iov,
+ size_t len,
+ int flags)
+{
+ if (flags & MSG_PEEK)
+ return vmci_qpair_peekv(vmci_trans(vsk)->qpair, iov, len, 0);
+ else
+ return vmci_qpair_dequev(vmci_trans(vsk)->qpair, iov, len, 0);
+}
+
+static ssize_t vmci_transport_stream_enqueue(
+ struct vsock_sock *vsk,
+ struct iovec *iov,
+ size_t len)
+{
+ return vmci_qpair_enquev(vmci_trans(vsk)->qpair, iov, len, 0);
+}
+
+static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk)
+{
+ return vmci_qpair_consume_buf_ready(vmci_trans(vsk)->qpair);
+}
+
+static s64 vmci_transport_stream_has_space(struct vsock_sock *vsk)
+{
+ return vmci_qpair_produce_free_space(vmci_trans(vsk)->qpair);
+}
+
+static u64 vmci_transport_stream_rcvhiwat(struct vsock_sock *vsk)
+{
+ return vmci_trans(vsk)->consume_size;
+}
+
+static bool vmci_transport_stream_is_active(struct vsock_sock *vsk)
+{
+ return !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle);
+}
+
+static u64 vmci_transport_get_buffer_size(struct vsock_sock *vsk)
+{
+ return vmci_trans(vsk)->queue_pair_size;
+}
+
+static u64 vmci_transport_get_min_buffer_size(struct vsock_sock *vsk)
+{
+ return vmci_trans(vsk)->queue_pair_min_size;
+}
+
+static u64 vmci_transport_get_max_buffer_size(struct vsock_sock *vsk)
+{
+ return vmci_trans(vsk)->queue_pair_max_size;
+}
+
+static void vmci_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
+{
+ if (val < vmci_trans(vsk)->queue_pair_min_size)
+ vmci_trans(vsk)->queue_pair_min_size = val;
+ if (val > vmci_trans(vsk)->queue_pair_max_size)
+ vmci_trans(vsk)->queue_pair_max_size = val;
+ vmci_trans(vsk)->queue_pair_size = val;
+}
+
+static void vmci_transport_set_min_buffer_size(struct vsock_sock *vsk,
+ u64 val)
+{
+ if (val > vmci_trans(vsk)->queue_pair_size)
+ vmci_trans(vsk)->queue_pair_size = val;
+ vmci_trans(vsk)->queue_pair_min_size = val;
+}
+
+static void vmci_transport_set_max_buffer_size(struct vsock_sock *vsk,
+ u64 val)
+{
+ if (val < vmci_trans(vsk)->queue_pair_size)
+ vmci_trans(vsk)->queue_pair_size = val;
+ vmci_trans(vsk)->queue_pair_max_size = val;
+}
+
+static int vmci_transport_notify_poll_in(
+ struct vsock_sock *vsk,
+ size_t target,
+ bool *data_ready_now)
+{
+ return vmci_trans(vsk)->notify_ops->poll_in(
+ &vsk->sk, target, data_ready_now);
+}
+
+static int vmci_transport_notify_poll_out(
+ struct vsock_sock *vsk,
+ size_t target,
+ bool *space_available_now)
+{
+ return vmci_trans(vsk)->notify_ops->poll_out(
+ &vsk->sk, target, space_available_now);
+}
+
+static int vmci_transport_notify_recv_init(
+ struct vsock_sock *vsk,
+ size_t target,
+ struct vsock_transport_recv_notify_data *data)
+{
+ return vmci_trans(vsk)->notify_ops->recv_init(
+ &vsk->sk, target,
+ (struct vmci_transport_recv_notify_data *)data);
+}
+
+static int vmci_transport_notify_recv_pre_block(
+ struct vsock_sock *vsk,
+ size_t target,
+ struct vsock_transport_recv_notify_data *data)
+{
+ return vmci_trans(vsk)->notify_ops->recv_pre_block(
+ &vsk->sk, target,
+ (struct vmci_transport_recv_notify_data *)data);
+}
+
+static int vmci_transport_notify_recv_pre_dequeue(
+ struct vsock_sock *vsk,
+ size_t target,
+ struct vsock_transport_recv_notify_data *data)
+{
+ return vmci_trans(vsk)->notify_ops->recv_pre_dequeue(
+ &vsk->sk, target,
+ (struct vmci_transport_recv_notify_data *)data);
+}
+
+static int vmci_transport_notify_recv_post_dequeue(
+ struct vsock_sock *vsk,
+ size_t target,
+ ssize_t copied,
+ bool data_read,
+ struct vsock_transport_recv_notify_data *data)
+{
+ return vmci_trans(vsk)->notify_ops->recv_post_dequeue(
+ &vsk->sk, target, copied, data_read,
+ (struct vmci_transport_recv_notify_data *)data);
+}
+
+static int vmci_transport_notify_send_init(
+ struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return vmci_trans(vsk)->notify_ops->send_init(
+ &vsk->sk,
+ (struct vmci_transport_send_notify_data *)data);
+}
+
+static int vmci_transport_notify_send_pre_block(
+ struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return vmci_trans(vsk)->notify_ops->send_pre_block(
+ &vsk->sk,
+ (struct vmci_transport_send_notify_data *)data);
+}
+
+static int vmci_transport_notify_send_pre_enqueue(
+ struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return vmci_trans(vsk)->notify_ops->send_pre_enqueue(
+ &vsk->sk,
+ (struct vmci_transport_send_notify_data *)data);
+}
+
+static int vmci_transport_notify_send_post_enqueue(
+ struct vsock_sock *vsk,
+ ssize_t written,
+ struct vsock_transport_send_notify_data *data)
+{
+ return vmci_trans(vsk)->notify_ops->send_post_enqueue(
+ &vsk->sk, written,
+ (struct vmci_transport_send_notify_data *)data);
+}
+
+static bool vmci_transport_old_proto_override(bool *old_pkt_proto)
+{
+ if (PROTOCOL_OVERRIDE != -1) {
+ if (PROTOCOL_OVERRIDE == 0)
+ *old_pkt_proto = true;
+ else
+ *old_pkt_proto = false;
+
+ pr_info("Proto override in use\n");
+ return true;
+ }
+
+ return false;
+}
+
+static bool vmci_transport_proto_to_notify_struct(struct sock *sk,
+ u16 *proto,
+ bool old_pkt_proto)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+
+ if (old_pkt_proto) {
+ if (*proto != VSOCK_PROTO_INVALID) {
+ pr_err("Can't set both an old and new protocol\n");
+ return false;
+ }
+ vmci_trans(vsk)->notify_ops = &vmci_transport_notify_pkt_ops;
+ goto exit;
+ }
+
+ switch (*proto) {
+ case VSOCK_PROTO_PKT_ON_NOTIFY:
+ vmci_trans(vsk)->notify_ops =
+ &vmci_transport_notify_pkt_q_state_ops;
+ break;
+ default:
+ pr_err("Unknown notify protocol version\n");
+ return false;
+ }
+
+exit:
+ vmci_trans(vsk)->notify_ops->socket_init(sk);
+ return true;
+}
+
+static u16 vmci_transport_new_proto_supported_versions(void)
+{
+ if (PROTOCOL_OVERRIDE != -1)
+ return PROTOCOL_OVERRIDE;
+
+ return VSOCK_PROTO_ALL_SUPPORTED;
+}
+
+static u32 vmci_transport_get_local_cid(void)
+{
+ return vmci_get_context_id();
+}
+
+static struct vsock_transport vmci_transport = {
+ .init = vmci_transport_socket_init,
+ .destruct = vmci_transport_destruct,
+ .release = vmci_transport_release,
+ .connect = vmci_transport_connect,
+ .dgram_bind = vmci_transport_dgram_bind,
+ .dgram_dequeue = vmci_transport_dgram_dequeue,
+ .dgram_enqueue = vmci_transport_dgram_enqueue,
+ .dgram_allow = vmci_transport_dgram_allow,
+ .stream_dequeue = vmci_transport_stream_dequeue,
+ .stream_enqueue = vmci_transport_stream_enqueue,
+ .stream_has_data = vmci_transport_stream_has_data,
+ .stream_has_space = vmci_transport_stream_has_space,
+ .stream_rcvhiwat = vmci_transport_stream_rcvhiwat,
+ .stream_is_active = vmci_transport_stream_is_active,
+ .stream_allow = vmci_transport_stream_allow,
+ .notify_poll_in = vmci_transport_notify_poll_in,
+ .notify_poll_out = vmci_transport_notify_poll_out,
+ .notify_recv_init = vmci_transport_notify_recv_init,
+ .notify_recv_pre_block = vmci_transport_notify_recv_pre_block,
+ .notify_recv_pre_dequeue = vmci_transport_notify_recv_pre_dequeue,
+ .notify_recv_post_dequeue = vmci_transport_notify_recv_post_dequeue,
+ .notify_send_init = vmci_transport_notify_send_init,
+ .notify_send_pre_block = vmci_transport_notify_send_pre_block,
+ .notify_send_pre_enqueue = vmci_transport_notify_send_pre_enqueue,
+ .notify_send_post_enqueue = vmci_transport_notify_send_post_enqueue,
+ .shutdown = vmci_transport_shutdown,
+ .set_buffer_size = vmci_transport_set_buffer_size,
+ .set_min_buffer_size = vmci_transport_set_min_buffer_size,
+ .set_max_buffer_size = vmci_transport_set_max_buffer_size,
+ .get_buffer_size = vmci_transport_get_buffer_size,
+ .get_min_buffer_size = vmci_transport_get_min_buffer_size,
+ .get_max_buffer_size = vmci_transport_get_max_buffer_size,
+ .get_local_cid = vmci_transport_get_local_cid,
+};
+
+static int __init vmci_transport_init(void)
+{
+ int err;
+
+ /* Create the datagram handle that we will use to send and receive all
+ * VSocket control messages for this context.
+ */
+ err = vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID,
+ VMCI_FLAG_ANYCID_DG_HND,
+ vmci_transport_recv_stream_cb,
+ NULL,
+ &vmci_transport_stream_handle);
+ if (err < VMCI_SUCCESS) {
+ pr_err("Unable to create datagram handle. (%d)\n", err);
+ return vmci_transport_error_to_vsock_error(err);
+ }
+
+ err = vmci_event_subscribe(VMCI_EVENT_QP_RESUMED,
+ vmci_transport_qp_resumed_cb,
+ NULL, &vmci_transport_qp_resumed_sub_id);
+ if (err < VMCI_SUCCESS) {
+ pr_err("Unable to subscribe to resumed event. (%d)\n", err);
+ err = vmci_transport_error_to_vsock_error(err);
+ vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
+ goto err_destroy_stream_handle;
+ }
+
+ err = vsock_core_init(&vmci_transport);
+ if (err < 0)
+ goto err_unsubscribe;
+
+ return 0;
+
+err_unsubscribe:
+ vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id);
+err_destroy_stream_handle:
+ vmci_datagram_destroy_handle(vmci_transport_stream_handle);
+ return err;
+}
+module_init(vmci_transport_init);
+
+static void __exit vmci_transport_exit(void)
+{
+ if (!vmci_handle_is_invalid(vmci_transport_stream_handle)) {
+ if (vmci_datagram_destroy_handle(
+ vmci_transport_stream_handle) != VMCI_SUCCESS)
+ pr_err("Couldn't destroy datagram handle\n");
+ vmci_transport_stream_handle = VMCI_INVALID_HANDLE;
+ }
+
+ if (vmci_transport_qp_resumed_sub_id != VMCI_INVALID_ID) {
+ vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id);
+ vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
+ }
+
+ vsock_core_exit();
+}
+module_exit(vmci_transport_exit);
+
+MODULE_AUTHOR("VMware, Inc.");
+MODULE_DESCRIPTION("VMCI transport for Virtual Sockets");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("vmware_vsock");
+MODULE_ALIAS_NETPROTO(PF_VSOCK);

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