| /* |
| * Hyper-V transport for vsock |
| * |
| * Hyper-V Sockets supplies a byte-stream based communication mechanism |
| * between the host and the VM. This driver implements the necessary |
| * support in the VM by introducing the new vsock transport. |
| * |
| * Copyright (c) 2017, Microsoft Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope 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/module.h> |
| #include <linux/vmalloc.h> |
| #include <linux/hyperv.h> |
| #include <net/sock.h> |
| #include <net/af_vsock.h> |
| |
| /* The host side's design of the feature requires 6 exact 4KB pages for |
| * recv/send rings respectively -- this is suboptimal considering memory |
| * consumption, however unluckily we have to live with it, before the |
| * host comes up with a better design in the future. |
| */ |
| #define PAGE_SIZE_4K 4096 |
| #define RINGBUFFER_HVS_RCV_SIZE (PAGE_SIZE_4K * 6) |
| #define RINGBUFFER_HVS_SND_SIZE (PAGE_SIZE_4K * 6) |
| |
| /* The MTU is 16KB per the host side's design */ |
| #define HVS_MTU_SIZE (1024 * 16) |
| |
| /* How long to wait for graceful shutdown of a connection */ |
| #define HVS_CLOSE_TIMEOUT (8 * HZ) |
| |
| struct vmpipe_proto_header { |
| u32 pkt_type; |
| u32 data_size; |
| }; |
| |
| /* For recv, we use the VMBus in-place packet iterator APIs to directly copy |
| * data from the ringbuffer into the userspace buffer. |
| */ |
| struct hvs_recv_buf { |
| /* The header before the payload data */ |
| struct vmpipe_proto_header hdr; |
| |
| /* The payload */ |
| u8 data[HVS_MTU_SIZE]; |
| }; |
| |
| /* We can send up to HVS_MTU_SIZE bytes of payload to the host, but let's use |
| * a small size, i.e. HVS_SEND_BUF_SIZE, to minimize the dynamically-allocated |
| * buffer, because tests show there is no significant performance difference. |
| * |
| * Note: the buffer can be eliminated in the future when we add new VMBus |
| * ringbuffer APIs that allow us to directly copy data from userspace buffer |
| * to VMBus ringbuffer. |
| */ |
| #define HVS_SEND_BUF_SIZE (PAGE_SIZE_4K - sizeof(struct vmpipe_proto_header)) |
| |
| struct hvs_send_buf { |
| /* The header before the payload data */ |
| struct vmpipe_proto_header hdr; |
| |
| /* The payload */ |
| u8 data[HVS_SEND_BUF_SIZE]; |
| }; |
| |
| #define HVS_HEADER_LEN (sizeof(struct vmpacket_descriptor) + \ |
| sizeof(struct vmpipe_proto_header)) |
| |
| /* See 'prev_indices' in hv_ringbuffer_read(), hv_ringbuffer_write(), and |
| * __hv_pkt_iter_next(). |
| */ |
| #define VMBUS_PKT_TRAILER_SIZE (sizeof(u64)) |
| |
| #define HVS_PKT_LEN(payload_len) (HVS_HEADER_LEN + \ |
| ALIGN((payload_len), 8) + \ |
| VMBUS_PKT_TRAILER_SIZE) |
| |
| union hvs_service_id { |
| uuid_le srv_id; |
| |
| struct { |
| unsigned int svm_port; |
| unsigned char b[sizeof(uuid_le) - sizeof(unsigned int)]; |
| }; |
| }; |
| |
| /* Per-socket state (accessed via vsk->trans) */ |
| struct hvsock { |
| struct vsock_sock *vsk; |
| |
| uuid_le vm_srv_id; |
| uuid_le host_srv_id; |
| |
| struct vmbus_channel *chan; |
| struct vmpacket_descriptor *recv_desc; |
| |
| /* The length of the payload not delivered to userland yet */ |
| u32 recv_data_len; |
| /* The offset of the payload */ |
| u32 recv_data_off; |
| |
| /* Have we sent the zero-length packet (FIN)? */ |
| bool fin_sent; |
| }; |
| |
| /* In the VM, we support Hyper-V Sockets with AF_VSOCK, and the endpoint is |
| * <cid, port> (see struct sockaddr_vm). Note: cid is not really used here: |
| * when we write apps to connect to the host, we can only use VMADDR_CID_ANY |
| * or VMADDR_CID_HOST (both are equivalent) as the remote cid, and when we |
| * write apps to bind() & listen() in the VM, we can only use VMADDR_CID_ANY |
| * as the local cid. |
| * |
| * On the host, Hyper-V Sockets are supported by Winsock AF_HYPERV: |
| * https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user- |
| * guide/make-integration-service, and the endpoint is <VmID, ServiceId> with |
| * the below sockaddr: |
| * |
| * struct SOCKADDR_HV |
| * { |
| * ADDRESS_FAMILY Family; |
| * USHORT Reserved; |
| * GUID VmId; |
| * GUID ServiceId; |
| * }; |
| * Note: VmID is not used by Linux VM and actually it isn't transmitted via |
| * VMBus, because here it's obvious the host and the VM can easily identify |
| * each other. Though the VmID is useful on the host, especially in the case |
| * of Windows container, Linux VM doesn't need it at all. |
| * |
| * To make use of the AF_VSOCK infrastructure in Linux VM, we have to limit |
| * the available GUID space of SOCKADDR_HV so that we can create a mapping |
| * between AF_VSOCK port and SOCKADDR_HV Service GUID. The rule of writing |
| * Hyper-V Sockets apps on the host and in Linux VM is: |
| * |
| **************************************************************************** |
| * The only valid Service GUIDs, from the perspectives of both the host and * |
| * Linux VM, that can be connected by the other end, must conform to this * |
| * format: <port>-facb-11e6-bd58-64006a7986d3, and the "port" must be in * |
| * this range [0, 0x7FFFFFFF]. * |
| **************************************************************************** |
| * |
| * When we write apps on the host to connect(), the GUID ServiceID is used. |
| * When we write apps in Linux VM to connect(), we only need to specify the |
| * port and the driver will form the GUID and use that to request the host. |
| * |
| * From the perspective of Linux VM: |
| * 1. the local ephemeral port (i.e. the local auto-bound port when we call |
| * connect() without explicit bind()) is generated by __vsock_bind_stream(), |
| * and the range is [1024, 0xFFFFFFFF). |
| * 2. the remote ephemeral port (i.e. the auto-generated remote port for |
| * a connect request initiated by the host's connect()) is generated by |
| * hvs_remote_addr_init() and the range is [0x80000000, 0xFFFFFFFF). |
| */ |
| |
| #define MAX_LISTEN_PORT ((u32)0x7FFFFFFF) |
| #define MAX_VM_LISTEN_PORT MAX_LISTEN_PORT |
| #define MAX_HOST_LISTEN_PORT MAX_LISTEN_PORT |
| #define MIN_HOST_EPHEMERAL_PORT (MAX_HOST_LISTEN_PORT + 1) |
| |
| /* 00000000-facb-11e6-bd58-64006a7986d3 */ |
| static const uuid_le srv_id_template = |
| UUID_LE(0x00000000, 0xfacb, 0x11e6, 0xbd, 0x58, |
| 0x64, 0x00, 0x6a, 0x79, 0x86, 0xd3); |
| |
| static bool is_valid_srv_id(const uuid_le *id) |
| { |
| return !memcmp(&id->b[4], &srv_id_template.b[4], sizeof(uuid_le) - 4); |
| } |
| |
| static unsigned int get_port_by_srv_id(const uuid_le *svr_id) |
| { |
| return *((unsigned int *)svr_id); |
| } |
| |
| static void hvs_addr_init(struct sockaddr_vm *addr, const uuid_le *svr_id) |
| { |
| unsigned int port = get_port_by_srv_id(svr_id); |
| |
| vsock_addr_init(addr, VMADDR_CID_ANY, port); |
| } |
| |
| static void hvs_remote_addr_init(struct sockaddr_vm *remote, |
| struct sockaddr_vm *local) |
| { |
| static u32 host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT; |
| struct sock *sk; |
| |
| vsock_addr_init(remote, VMADDR_CID_ANY, VMADDR_PORT_ANY); |
| |
| while (1) { |
| /* Wrap around ? */ |
| if (host_ephemeral_port < MIN_HOST_EPHEMERAL_PORT || |
| host_ephemeral_port == VMADDR_PORT_ANY) |
| host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT; |
| |
| remote->svm_port = host_ephemeral_port++; |
| |
| sk = vsock_find_connected_socket(remote, local); |
| if (!sk) { |
| /* Found an available ephemeral port */ |
| return; |
| } |
| |
| /* Release refcnt got in vsock_find_connected_socket */ |
| sock_put(sk); |
| } |
| } |
| |
| static void hvs_set_channel_pending_send_size(struct vmbus_channel *chan) |
| { |
| set_channel_pending_send_size(chan, |
| HVS_PKT_LEN(HVS_SEND_BUF_SIZE)); |
| |
| virt_mb(); |
| } |
| |
| static bool hvs_channel_readable(struct vmbus_channel *chan) |
| { |
| u32 readable = hv_get_bytes_to_read(&chan->inbound); |
| |
| /* 0-size payload means FIN */ |
| return readable >= HVS_PKT_LEN(0); |
| } |
| |
| static int hvs_channel_readable_payload(struct vmbus_channel *chan) |
| { |
| u32 readable = hv_get_bytes_to_read(&chan->inbound); |
| |
| if (readable > HVS_PKT_LEN(0)) { |
| /* At least we have 1 byte to read. We don't need to return |
| * the exact readable bytes: see vsock_stream_recvmsg() -> |
| * vsock_stream_has_data(). |
| */ |
| return 1; |
| } |
| |
| if (readable == HVS_PKT_LEN(0)) { |
| /* 0-size payload means FIN */ |
| return 0; |
| } |
| |
| /* No payload or FIN */ |
| return -1; |
| } |
| |
| static size_t hvs_channel_writable_bytes(struct vmbus_channel *chan) |
| { |
| u32 writeable = hv_get_bytes_to_write(&chan->outbound); |
| size_t ret; |
| |
| /* The ringbuffer mustn't be 100% full, and we should reserve a |
| * zero-length-payload packet for the FIN: see hv_ringbuffer_write() |
| * and hvs_shutdown(). |
| */ |
| if (writeable <= HVS_PKT_LEN(1) + HVS_PKT_LEN(0)) |
| return 0; |
| |
| ret = writeable - HVS_PKT_LEN(1) - HVS_PKT_LEN(0); |
| |
| return round_down(ret, 8); |
| } |
| |
| static int hvs_send_data(struct vmbus_channel *chan, |
| struct hvs_send_buf *send_buf, size_t to_write) |
| { |
| send_buf->hdr.pkt_type = 1; |
| send_buf->hdr.data_size = to_write; |
| return vmbus_sendpacket(chan, &send_buf->hdr, |
| sizeof(send_buf->hdr) + to_write, |
| 0, VM_PKT_DATA_INBAND, 0); |
| } |
| |
| static void hvs_channel_cb(void *ctx) |
| { |
| struct sock *sk = (struct sock *)ctx; |
| struct vsock_sock *vsk = vsock_sk(sk); |
| struct hvsock *hvs = vsk->trans; |
| struct vmbus_channel *chan = hvs->chan; |
| |
| if (hvs_channel_readable(chan)) |
| sk->sk_data_ready(sk); |
| |
| if (hv_get_bytes_to_write(&chan->outbound) > 0) |
| sk->sk_write_space(sk); |
| } |
| |
| static void hvs_do_close_lock_held(struct vsock_sock *vsk, |
| bool cancel_timeout) |
| { |
| struct sock *sk = sk_vsock(vsk); |
| |
| sock_set_flag(sk, SOCK_DONE); |
| vsk->peer_shutdown = SHUTDOWN_MASK; |
| if (vsock_stream_has_data(vsk) <= 0) |
| sk->sk_state = TCP_CLOSING; |
| sk->sk_state_change(sk); |
| if (vsk->close_work_scheduled && |
| (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) { |
| vsk->close_work_scheduled = false; |
| vsock_remove_sock(vsk); |
| |
| /* Release the reference taken while scheduling the timeout */ |
| sock_put(sk); |
| } |
| } |
| |
| static void hvs_close_connection(struct vmbus_channel *chan) |
| { |
| struct sock *sk = get_per_channel_state(chan); |
| |
| lock_sock(sk); |
| hvs_do_close_lock_held(vsock_sk(sk), true); |
| release_sock(sk); |
| |
| /* Release the refcnt for the channel that's opened in |
| * hvs_open_connection(). |
| */ |
| sock_put(sk); |
| } |
| |
| static void hvs_open_connection(struct vmbus_channel *chan) |
| { |
| uuid_le *if_instance, *if_type; |
| unsigned char conn_from_host; |
| |
| struct sockaddr_vm addr; |
| struct sock *sk, *new = NULL; |
| struct vsock_sock *vnew = NULL; |
| struct hvsock *hvs = NULL; |
| struct hvsock *hvs_new = NULL; |
| int ret; |
| |
| if_type = &chan->offermsg.offer.if_type; |
| if_instance = &chan->offermsg.offer.if_instance; |
| conn_from_host = chan->offermsg.offer.u.pipe.user_def[0]; |
| |
| /* The host or the VM should only listen on a port in |
| * [0, MAX_LISTEN_PORT] |
| */ |
| if (!is_valid_srv_id(if_type) || |
| get_port_by_srv_id(if_type) > MAX_LISTEN_PORT) |
| return; |
| |
| hvs_addr_init(&addr, conn_from_host ? if_type : if_instance); |
| sk = vsock_find_bound_socket(&addr); |
| if (!sk) |
| return; |
| |
| lock_sock(sk); |
| |
| if ((conn_from_host && sk->sk_state != TCP_LISTEN) || |
| (!conn_from_host && sk->sk_state != TCP_SYN_SENT)) |
| goto out; |
| |
| if (conn_from_host) { |
| if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) |
| goto out; |
| |
| new = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, |
| sk->sk_type, 0); |
| if (!new) |
| goto out; |
| |
| new->sk_state = TCP_SYN_SENT; |
| vnew = vsock_sk(new); |
| hvs_new = vnew->trans; |
| hvs_new->chan = chan; |
| } else { |
| hvs = vsock_sk(sk)->trans; |
| hvs->chan = chan; |
| } |
| |
| set_channel_read_mode(chan, HV_CALL_DIRECT); |
| ret = vmbus_open(chan, RINGBUFFER_HVS_SND_SIZE, |
| RINGBUFFER_HVS_RCV_SIZE, NULL, 0, |
| hvs_channel_cb, conn_from_host ? new : sk); |
| if (ret != 0) { |
| if (conn_from_host) { |
| hvs_new->chan = NULL; |
| sock_put(new); |
| } else { |
| hvs->chan = NULL; |
| } |
| goto out; |
| } |
| |
| set_per_channel_state(chan, conn_from_host ? new : sk); |
| |
| /* This reference will be dropped by hvs_close_connection(). */ |
| sock_hold(conn_from_host ? new : sk); |
| vmbus_set_chn_rescind_callback(chan, hvs_close_connection); |
| |
| /* Set the pending send size to max packet size to always get |
| * notifications from the host when there is enough writable space. |
| * The host is optimized to send notifications only when the pending |
| * size boundary is crossed, and not always. |
| */ |
| hvs_set_channel_pending_send_size(chan); |
| |
| if (conn_from_host) { |
| new->sk_state = TCP_ESTABLISHED; |
| sk->sk_ack_backlog++; |
| |
| hvs_addr_init(&vnew->local_addr, if_type); |
| hvs_remote_addr_init(&vnew->remote_addr, &vnew->local_addr); |
| |
| hvs_new->vm_srv_id = *if_type; |
| hvs_new->host_srv_id = *if_instance; |
| |
| vsock_insert_connected(vnew); |
| |
| vsock_enqueue_accept(sk, new); |
| } else { |
| sk->sk_state = TCP_ESTABLISHED; |
| sk->sk_socket->state = SS_CONNECTED; |
| |
| vsock_insert_connected(vsock_sk(sk)); |
| } |
| |
| sk->sk_state_change(sk); |
| |
| out: |
| /* Release refcnt obtained when we called vsock_find_bound_socket() */ |
| sock_put(sk); |
| |
| release_sock(sk); |
| } |
| |
| static u32 hvs_get_local_cid(void) |
| { |
| return VMADDR_CID_ANY; |
| } |
| |
| static int hvs_sock_init(struct vsock_sock *vsk, struct vsock_sock *psk) |
| { |
| struct hvsock *hvs; |
| |
| hvs = kzalloc(sizeof(*hvs), GFP_KERNEL); |
| if (!hvs) |
| return -ENOMEM; |
| |
| vsk->trans = hvs; |
| hvs->vsk = vsk; |
| |
| return 0; |
| } |
| |
| static int hvs_connect(struct vsock_sock *vsk) |
| { |
| union hvs_service_id vm, host; |
| struct hvsock *h = vsk->trans; |
| |
| vm.srv_id = srv_id_template; |
| vm.svm_port = vsk->local_addr.svm_port; |
| h->vm_srv_id = vm.srv_id; |
| |
| host.srv_id = srv_id_template; |
| host.svm_port = vsk->remote_addr.svm_port; |
| h->host_srv_id = host.srv_id; |
| |
| return vmbus_send_tl_connect_request(&h->vm_srv_id, &h->host_srv_id); |
| } |
| |
| static void hvs_shutdown_lock_held(struct hvsock *hvs, int mode) |
| { |
| struct vmpipe_proto_header hdr; |
| |
| if (hvs->fin_sent || !hvs->chan) |
| return; |
| |
| /* It can't fail: see hvs_channel_writable_bytes(). */ |
| (void)hvs_send_data(hvs->chan, (struct hvs_send_buf *)&hdr, 0); |
| hvs->fin_sent = true; |
| } |
| |
| static int hvs_shutdown(struct vsock_sock *vsk, int mode) |
| { |
| struct sock *sk = sk_vsock(vsk); |
| |
| if (!(mode & SEND_SHUTDOWN)) |
| return 0; |
| |
| lock_sock(sk); |
| hvs_shutdown_lock_held(vsk->trans, mode); |
| release_sock(sk); |
| return 0; |
| } |
| |
| static void hvs_close_timeout(struct work_struct *work) |
| { |
| struct vsock_sock *vsk = |
| container_of(work, struct vsock_sock, close_work.work); |
| struct sock *sk = sk_vsock(vsk); |
| |
| sock_hold(sk); |
| lock_sock(sk); |
| if (!sock_flag(sk, SOCK_DONE)) |
| hvs_do_close_lock_held(vsk, false); |
| |
| vsk->close_work_scheduled = false; |
| release_sock(sk); |
| sock_put(sk); |
| } |
| |
| /* Returns true, if it is safe to remove socket; false otherwise */ |
| static bool hvs_close_lock_held(struct vsock_sock *vsk) |
| { |
| struct sock *sk = sk_vsock(vsk); |
| |
| if (!(sk->sk_state == TCP_ESTABLISHED || |
| sk->sk_state == TCP_CLOSING)) |
| return true; |
| |
| if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK) |
| hvs_shutdown_lock_held(vsk->trans, SHUTDOWN_MASK); |
| |
| if (sock_flag(sk, SOCK_DONE)) |
| return true; |
| |
| /* This reference will be dropped by the delayed close routine */ |
| sock_hold(sk); |
| INIT_DELAYED_WORK(&vsk->close_work, hvs_close_timeout); |
| vsk->close_work_scheduled = true; |
| schedule_delayed_work(&vsk->close_work, HVS_CLOSE_TIMEOUT); |
| return false; |
| } |
| |
| static void hvs_release(struct vsock_sock *vsk) |
| { |
| struct sock *sk = sk_vsock(vsk); |
| bool remove_sock; |
| |
| lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
| remove_sock = hvs_close_lock_held(vsk); |
| release_sock(sk); |
| if (remove_sock) |
| vsock_remove_sock(vsk); |
| } |
| |
| static void hvs_destruct(struct vsock_sock *vsk) |
| { |
| struct hvsock *hvs = vsk->trans; |
| struct vmbus_channel *chan = hvs->chan; |
| |
| if (chan) |
| vmbus_hvsock_device_unregister(chan); |
| |
| kfree(hvs); |
| } |
| |
| static int hvs_dgram_bind(struct vsock_sock *vsk, struct sockaddr_vm *addr) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static int hvs_dgram_dequeue(struct vsock_sock *vsk, struct msghdr *msg, |
| size_t len, int flags) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static int hvs_dgram_enqueue(struct vsock_sock *vsk, |
| struct sockaddr_vm *remote, struct msghdr *msg, |
| size_t dgram_len) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static bool hvs_dgram_allow(u32 cid, u32 port) |
| { |
| return false; |
| } |
| |
| static int hvs_update_recv_data(struct hvsock *hvs) |
| { |
| struct hvs_recv_buf *recv_buf; |
| u32 payload_len; |
| |
| recv_buf = (struct hvs_recv_buf *)(hvs->recv_desc + 1); |
| payload_len = recv_buf->hdr.data_size; |
| |
| if (payload_len > HVS_MTU_SIZE) |
| return -EIO; |
| |
| if (payload_len == 0) |
| hvs->vsk->peer_shutdown |= SEND_SHUTDOWN; |
| |
| hvs->recv_data_len = payload_len; |
| hvs->recv_data_off = 0; |
| |
| return 0; |
| } |
| |
| static ssize_t hvs_stream_dequeue(struct vsock_sock *vsk, struct msghdr *msg, |
| size_t len, int flags) |
| { |
| struct hvsock *hvs = vsk->trans; |
| bool need_refill = !hvs->recv_desc; |
| struct hvs_recv_buf *recv_buf; |
| u32 to_read; |
| int ret; |
| |
| if (flags & MSG_PEEK) |
| return -EOPNOTSUPP; |
| |
| if (need_refill) { |
| hvs->recv_desc = hv_pkt_iter_first(hvs->chan); |
| ret = hvs_update_recv_data(hvs); |
| if (ret) |
| return ret; |
| } |
| |
| recv_buf = (struct hvs_recv_buf *)(hvs->recv_desc + 1); |
| to_read = min_t(u32, len, hvs->recv_data_len); |
| ret = memcpy_to_msg(msg, recv_buf->data + hvs->recv_data_off, to_read); |
| if (ret != 0) |
| return ret; |
| |
| hvs->recv_data_len -= to_read; |
| if (hvs->recv_data_len == 0) { |
| hvs->recv_desc = hv_pkt_iter_next(hvs->chan, hvs->recv_desc); |
| if (hvs->recv_desc) { |
| ret = hvs_update_recv_data(hvs); |
| if (ret) |
| return ret; |
| } |
| } else { |
| hvs->recv_data_off += to_read; |
| } |
| |
| return to_read; |
| } |
| |
| static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg, |
| size_t len) |
| { |
| struct hvsock *hvs = vsk->trans; |
| struct vmbus_channel *chan = hvs->chan; |
| struct hvs_send_buf *send_buf; |
| ssize_t to_write, max_writable, ret; |
| |
| BUILD_BUG_ON(sizeof(*send_buf) != PAGE_SIZE_4K); |
| |
| send_buf = kmalloc(sizeof(*send_buf), GFP_KERNEL); |
| if (!send_buf) |
| return -ENOMEM; |
| |
| max_writable = hvs_channel_writable_bytes(chan); |
| to_write = min_t(ssize_t, len, max_writable); |
| to_write = min_t(ssize_t, to_write, HVS_SEND_BUF_SIZE); |
| |
| ret = memcpy_from_msg(send_buf->data, msg, to_write); |
| if (ret < 0) |
| goto out; |
| |
| ret = hvs_send_data(hvs->chan, send_buf, to_write); |
| if (ret < 0) |
| goto out; |
| |
| ret = to_write; |
| out: |
| kfree(send_buf); |
| return ret; |
| } |
| |
| static s64 hvs_stream_has_data(struct vsock_sock *vsk) |
| { |
| struct hvsock *hvs = vsk->trans; |
| s64 ret; |
| |
| if (hvs->recv_data_len > 0) |
| return 1; |
| |
| switch (hvs_channel_readable_payload(hvs->chan)) { |
| case 1: |
| ret = 1; |
| break; |
| case 0: |
| vsk->peer_shutdown |= SEND_SHUTDOWN; |
| ret = 0; |
| break; |
| default: /* -1 */ |
| ret = 0; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static s64 hvs_stream_has_space(struct vsock_sock *vsk) |
| { |
| struct hvsock *hvs = vsk->trans; |
| |
| return hvs_channel_writable_bytes(hvs->chan); |
| } |
| |
| static u64 hvs_stream_rcvhiwat(struct vsock_sock *vsk) |
| { |
| return HVS_MTU_SIZE + 1; |
| } |
| |
| static bool hvs_stream_is_active(struct vsock_sock *vsk) |
| { |
| struct hvsock *hvs = vsk->trans; |
| |
| return hvs->chan != NULL; |
| } |
| |
| static bool hvs_stream_allow(u32 cid, u32 port) |
| { |
| /* The host's port range [MIN_HOST_EPHEMERAL_PORT, 0xFFFFFFFF) is |
| * reserved as ephemeral ports, which are used as the host's ports |
| * when the host initiates connections. |
| * |
| * Perform this check in the guest so an immediate error is produced |
| * instead of a timeout. |
| */ |
| if (port > MAX_HOST_LISTEN_PORT) |
| return false; |
| |
| if (cid == VMADDR_CID_HOST) |
| return true; |
| |
| return false; |
| } |
| |
| static |
| int hvs_notify_poll_in(struct vsock_sock *vsk, size_t target, bool *readable) |
| { |
| struct hvsock *hvs = vsk->trans; |
| |
| *readable = hvs_channel_readable(hvs->chan); |
| return 0; |
| } |
| |
| static |
| int hvs_notify_poll_out(struct vsock_sock *vsk, size_t target, bool *writable) |
| { |
| *writable = hvs_stream_has_space(vsk) > 0; |
| |
| return 0; |
| } |
| |
| static |
| int hvs_notify_recv_init(struct vsock_sock *vsk, size_t target, |
| struct vsock_transport_recv_notify_data *d) |
| { |
| return 0; |
| } |
| |
| static |
| int hvs_notify_recv_pre_block(struct vsock_sock *vsk, size_t target, |
| struct vsock_transport_recv_notify_data *d) |
| { |
| return 0; |
| } |
| |
| static |
| int hvs_notify_recv_pre_dequeue(struct vsock_sock *vsk, size_t target, |
| struct vsock_transport_recv_notify_data *d) |
| { |
| return 0; |
| } |
| |
| static |
| int hvs_notify_recv_post_dequeue(struct vsock_sock *vsk, size_t target, |
| ssize_t copied, bool data_read, |
| struct vsock_transport_recv_notify_data *d) |
| { |
| return 0; |
| } |
| |
| static |
| int hvs_notify_send_init(struct vsock_sock *vsk, |
| struct vsock_transport_send_notify_data *d) |
| { |
| return 0; |
| } |
| |
| static |
| int hvs_notify_send_pre_block(struct vsock_sock *vsk, |
| struct vsock_transport_send_notify_data *d) |
| { |
| return 0; |
| } |
| |
| static |
| int hvs_notify_send_pre_enqueue(struct vsock_sock *vsk, |
| struct vsock_transport_send_notify_data *d) |
| { |
| return 0; |
| } |
| |
| static |
| int hvs_notify_send_post_enqueue(struct vsock_sock *vsk, ssize_t written, |
| struct vsock_transport_send_notify_data *d) |
| { |
| return 0; |
| } |
| |
| static void hvs_set_buffer_size(struct vsock_sock *vsk, u64 val) |
| { |
| /* Ignored. */ |
| } |
| |
| static void hvs_set_min_buffer_size(struct vsock_sock *vsk, u64 val) |
| { |
| /* Ignored. */ |
| } |
| |
| static void hvs_set_max_buffer_size(struct vsock_sock *vsk, u64 val) |
| { |
| /* Ignored. */ |
| } |
| |
| static u64 hvs_get_buffer_size(struct vsock_sock *vsk) |
| { |
| return -ENOPROTOOPT; |
| } |
| |
| static u64 hvs_get_min_buffer_size(struct vsock_sock *vsk) |
| { |
| return -ENOPROTOOPT; |
| } |
| |
| static u64 hvs_get_max_buffer_size(struct vsock_sock *vsk) |
| { |
| return -ENOPROTOOPT; |
| } |
| |
| static struct vsock_transport hvs_transport = { |
| .get_local_cid = hvs_get_local_cid, |
| |
| .init = hvs_sock_init, |
| .destruct = hvs_destruct, |
| .release = hvs_release, |
| .connect = hvs_connect, |
| .shutdown = hvs_shutdown, |
| |
| .dgram_bind = hvs_dgram_bind, |
| .dgram_dequeue = hvs_dgram_dequeue, |
| .dgram_enqueue = hvs_dgram_enqueue, |
| .dgram_allow = hvs_dgram_allow, |
| |
| .stream_dequeue = hvs_stream_dequeue, |
| .stream_enqueue = hvs_stream_enqueue, |
| .stream_has_data = hvs_stream_has_data, |
| .stream_has_space = hvs_stream_has_space, |
| .stream_rcvhiwat = hvs_stream_rcvhiwat, |
| .stream_is_active = hvs_stream_is_active, |
| .stream_allow = hvs_stream_allow, |
| |
| .notify_poll_in = hvs_notify_poll_in, |
| .notify_poll_out = hvs_notify_poll_out, |
| .notify_recv_init = hvs_notify_recv_init, |
| .notify_recv_pre_block = hvs_notify_recv_pre_block, |
| .notify_recv_pre_dequeue = hvs_notify_recv_pre_dequeue, |
| .notify_recv_post_dequeue = hvs_notify_recv_post_dequeue, |
| .notify_send_init = hvs_notify_send_init, |
| .notify_send_pre_block = hvs_notify_send_pre_block, |
| .notify_send_pre_enqueue = hvs_notify_send_pre_enqueue, |
| .notify_send_post_enqueue = hvs_notify_send_post_enqueue, |
| |
| .set_buffer_size = hvs_set_buffer_size, |
| .set_min_buffer_size = hvs_set_min_buffer_size, |
| .set_max_buffer_size = hvs_set_max_buffer_size, |
| .get_buffer_size = hvs_get_buffer_size, |
| .get_min_buffer_size = hvs_get_min_buffer_size, |
| .get_max_buffer_size = hvs_get_max_buffer_size, |
| }; |
| |
| static int hvs_probe(struct hv_device *hdev, |
| const struct hv_vmbus_device_id *dev_id) |
| { |
| struct vmbus_channel *chan = hdev->channel; |
| |
| hvs_open_connection(chan); |
| |
| /* Always return success to suppress the unnecessary error message |
| * in vmbus_probe(): on error the host will rescind the device in |
| * 30 seconds and we can do cleanup at that time in |
| * vmbus_onoffer_rescind(). |
| */ |
| return 0; |
| } |
| |
| static int hvs_remove(struct hv_device *hdev) |
| { |
| struct vmbus_channel *chan = hdev->channel; |
| |
| vmbus_close(chan); |
| |
| return 0; |
| } |
| |
| /* This isn't really used. See vmbus_match() and vmbus_probe() */ |
| static const struct hv_vmbus_device_id id_table[] = { |
| {}, |
| }; |
| |
| static struct hv_driver hvs_drv = { |
| .name = "hv_sock", |
| .hvsock = true, |
| .id_table = id_table, |
| .probe = hvs_probe, |
| .remove = hvs_remove, |
| }; |
| |
| static int __init hvs_init(void) |
| { |
| int ret; |
| |
| if (vmbus_proto_version < VERSION_WIN10) |
| return -ENODEV; |
| |
| ret = vmbus_driver_register(&hvs_drv); |
| if (ret != 0) |
| return ret; |
| |
| ret = vsock_core_init(&hvs_transport); |
| if (ret) { |
| vmbus_driver_unregister(&hvs_drv); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static void __exit hvs_exit(void) |
| { |
| vsock_core_exit(); |
| vmbus_driver_unregister(&hvs_drv); |
| } |
| |
| module_init(hvs_init); |
| module_exit(hvs_exit); |
| |
| MODULE_DESCRIPTION("Hyper-V Sockets"); |
| MODULE_VERSION("1.0.0"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NETPROTO(PF_VSOCK); |