12025cf9eSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2ae0078fcSDexuan Cui /* 3ae0078fcSDexuan Cui * Hyper-V transport for vsock 4ae0078fcSDexuan Cui * 5ae0078fcSDexuan Cui * Hyper-V Sockets supplies a byte-stream based communication mechanism 6ae0078fcSDexuan Cui * between the host and the VM. This driver implements the necessary 7ae0078fcSDexuan Cui * support in the VM by introducing the new vsock transport. 8ae0078fcSDexuan Cui * 9ae0078fcSDexuan Cui * Copyright (c) 2017, Microsoft Corporation. 10ae0078fcSDexuan Cui */ 11ae0078fcSDexuan Cui #include <linux/module.h> 12ae0078fcSDexuan Cui #include <linux/vmalloc.h> 13ae0078fcSDexuan Cui #include <linux/hyperv.h> 14ae0078fcSDexuan Cui #include <net/sock.h> 15ae0078fcSDexuan Cui #include <net/af_vsock.h> 16ae0078fcSDexuan Cui 17ac383f58SSunil Muthuswamy /* Older (VMBUS version 'VERSION_WIN10' or before) Windows hosts have some 18ac383f58SSunil Muthuswamy * stricter requirements on the hv_sock ring buffer size of six 4K pages. Newer 19ac383f58SSunil Muthuswamy * hosts don't have this limitation; but, keep the defaults the same for compat. 20ae0078fcSDexuan Cui */ 21ae0078fcSDexuan Cui #define PAGE_SIZE_4K 4096 22ae0078fcSDexuan Cui #define RINGBUFFER_HVS_RCV_SIZE (PAGE_SIZE_4K * 6) 23ae0078fcSDexuan Cui #define RINGBUFFER_HVS_SND_SIZE (PAGE_SIZE_4K * 6) 24ac383f58SSunil Muthuswamy #define RINGBUFFER_HVS_MAX_SIZE (PAGE_SIZE_4K * 64) 25ae0078fcSDexuan Cui 26ae0078fcSDexuan Cui /* The MTU is 16KB per the host side's design */ 27ae0078fcSDexuan Cui #define HVS_MTU_SIZE (1024 * 16) 28ae0078fcSDexuan Cui 29a9eeb998SSunil Muthuswamy /* How long to wait for graceful shutdown of a connection */ 30a9eeb998SSunil Muthuswamy #define HVS_CLOSE_TIMEOUT (8 * HZ) 31a9eeb998SSunil Muthuswamy 32ae0078fcSDexuan Cui struct vmpipe_proto_header { 33ae0078fcSDexuan Cui u32 pkt_type; 34ae0078fcSDexuan Cui u32 data_size; 35ae0078fcSDexuan Cui }; 36ae0078fcSDexuan Cui 37ae0078fcSDexuan Cui /* For recv, we use the VMBus in-place packet iterator APIs to directly copy 38ae0078fcSDexuan Cui * data from the ringbuffer into the userspace buffer. 39ae0078fcSDexuan Cui */ 40ae0078fcSDexuan Cui struct hvs_recv_buf { 41ae0078fcSDexuan Cui /* The header before the payload data */ 42ae0078fcSDexuan Cui struct vmpipe_proto_header hdr; 43ae0078fcSDexuan Cui 44ae0078fcSDexuan Cui /* The payload */ 45ae0078fcSDexuan Cui u8 data[HVS_MTU_SIZE]; 46ae0078fcSDexuan Cui }; 47ae0078fcSDexuan Cui 48ae0078fcSDexuan Cui /* We can send up to HVS_MTU_SIZE bytes of payload to the host, but let's use 4914a1eaa8SSunil Muthuswamy * a smaller size, i.e. HVS_SEND_BUF_SIZE, to maximize concurrency between the 5014a1eaa8SSunil Muthuswamy * guest and the host processing as one VMBUS packet is the smallest processing 5114a1eaa8SSunil Muthuswamy * unit. 52ae0078fcSDexuan Cui * 53ae0078fcSDexuan Cui * Note: the buffer can be eliminated in the future when we add new VMBus 54ae0078fcSDexuan Cui * ringbuffer APIs that allow us to directly copy data from userspace buffer 55ae0078fcSDexuan Cui * to VMBus ringbuffer. 56ae0078fcSDexuan Cui */ 57ae0078fcSDexuan Cui #define HVS_SEND_BUF_SIZE (PAGE_SIZE_4K - sizeof(struct vmpipe_proto_header)) 58ae0078fcSDexuan Cui 59ae0078fcSDexuan Cui struct hvs_send_buf { 60ae0078fcSDexuan Cui /* The header before the payload data */ 61ae0078fcSDexuan Cui struct vmpipe_proto_header hdr; 62ae0078fcSDexuan Cui 63ae0078fcSDexuan Cui /* The payload */ 64ae0078fcSDexuan Cui u8 data[HVS_SEND_BUF_SIZE]; 65ae0078fcSDexuan Cui }; 66ae0078fcSDexuan Cui 67ae0078fcSDexuan Cui #define HVS_HEADER_LEN (sizeof(struct vmpacket_descriptor) + \ 68ae0078fcSDexuan Cui sizeof(struct vmpipe_proto_header)) 69ae0078fcSDexuan Cui 70ae0078fcSDexuan Cui /* See 'prev_indices' in hv_ringbuffer_read(), hv_ringbuffer_write(), and 71ae0078fcSDexuan Cui * __hv_pkt_iter_next(). 72ae0078fcSDexuan Cui */ 73ae0078fcSDexuan Cui #define VMBUS_PKT_TRAILER_SIZE (sizeof(u64)) 74ae0078fcSDexuan Cui 75ae0078fcSDexuan Cui #define HVS_PKT_LEN(payload_len) (HVS_HEADER_LEN + \ 76ae0078fcSDexuan Cui ALIGN((payload_len), 8) + \ 77ae0078fcSDexuan Cui VMBUS_PKT_TRAILER_SIZE) 78ae0078fcSDexuan Cui 79ae0078fcSDexuan Cui union hvs_service_id { 80ae0078fcSDexuan Cui uuid_le srv_id; 81ae0078fcSDexuan Cui 82ae0078fcSDexuan Cui struct { 83ae0078fcSDexuan Cui unsigned int svm_port; 84ae0078fcSDexuan Cui unsigned char b[sizeof(uuid_le) - sizeof(unsigned int)]; 85ae0078fcSDexuan Cui }; 86ae0078fcSDexuan Cui }; 87ae0078fcSDexuan Cui 88ae0078fcSDexuan Cui /* Per-socket state (accessed via vsk->trans) */ 89ae0078fcSDexuan Cui struct hvsock { 90ae0078fcSDexuan Cui struct vsock_sock *vsk; 91ae0078fcSDexuan Cui 92ae0078fcSDexuan Cui uuid_le vm_srv_id; 93ae0078fcSDexuan Cui uuid_le host_srv_id; 94ae0078fcSDexuan Cui 95ae0078fcSDexuan Cui struct vmbus_channel *chan; 96ae0078fcSDexuan Cui struct vmpacket_descriptor *recv_desc; 97ae0078fcSDexuan Cui 98ae0078fcSDexuan Cui /* The length of the payload not delivered to userland yet */ 99ae0078fcSDexuan Cui u32 recv_data_len; 100ae0078fcSDexuan Cui /* The offset of the payload */ 101ae0078fcSDexuan Cui u32 recv_data_off; 102ae0078fcSDexuan Cui 103ae0078fcSDexuan Cui /* Have we sent the zero-length packet (FIN)? */ 104ae0078fcSDexuan Cui bool fin_sent; 105ae0078fcSDexuan Cui }; 106ae0078fcSDexuan Cui 107ae0078fcSDexuan Cui /* In the VM, we support Hyper-V Sockets with AF_VSOCK, and the endpoint is 108ae0078fcSDexuan Cui * <cid, port> (see struct sockaddr_vm). Note: cid is not really used here: 109ae0078fcSDexuan Cui * when we write apps to connect to the host, we can only use VMADDR_CID_ANY 110ae0078fcSDexuan Cui * or VMADDR_CID_HOST (both are equivalent) as the remote cid, and when we 111ae0078fcSDexuan Cui * write apps to bind() & listen() in the VM, we can only use VMADDR_CID_ANY 112ae0078fcSDexuan Cui * as the local cid. 113ae0078fcSDexuan Cui * 114ae0078fcSDexuan Cui * On the host, Hyper-V Sockets are supported by Winsock AF_HYPERV: 115ae0078fcSDexuan Cui * https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user- 116ae0078fcSDexuan Cui * guide/make-integration-service, and the endpoint is <VmID, ServiceId> with 117ae0078fcSDexuan Cui * the below sockaddr: 118ae0078fcSDexuan Cui * 119ae0078fcSDexuan Cui * struct SOCKADDR_HV 120ae0078fcSDexuan Cui * { 121ae0078fcSDexuan Cui * ADDRESS_FAMILY Family; 122ae0078fcSDexuan Cui * USHORT Reserved; 123ae0078fcSDexuan Cui * GUID VmId; 124ae0078fcSDexuan Cui * GUID ServiceId; 125ae0078fcSDexuan Cui * }; 126ae0078fcSDexuan Cui * Note: VmID is not used by Linux VM and actually it isn't transmitted via 127ae0078fcSDexuan Cui * VMBus, because here it's obvious the host and the VM can easily identify 128ae0078fcSDexuan Cui * each other. Though the VmID is useful on the host, especially in the case 129ae0078fcSDexuan Cui * of Windows container, Linux VM doesn't need it at all. 130ae0078fcSDexuan Cui * 131ae0078fcSDexuan Cui * To make use of the AF_VSOCK infrastructure in Linux VM, we have to limit 132ae0078fcSDexuan Cui * the available GUID space of SOCKADDR_HV so that we can create a mapping 133ae0078fcSDexuan Cui * between AF_VSOCK port and SOCKADDR_HV Service GUID. The rule of writing 134ae0078fcSDexuan Cui * Hyper-V Sockets apps on the host and in Linux VM is: 135ae0078fcSDexuan Cui * 136ae0078fcSDexuan Cui **************************************************************************** 137ae0078fcSDexuan Cui * The only valid Service GUIDs, from the perspectives of both the host and * 138ae0078fcSDexuan Cui * Linux VM, that can be connected by the other end, must conform to this * 139ae0078fcSDexuan Cui * format: <port>-facb-11e6-bd58-64006a7986d3, and the "port" must be in * 140ae0078fcSDexuan Cui * this range [0, 0x7FFFFFFF]. * 141ae0078fcSDexuan Cui **************************************************************************** 142ae0078fcSDexuan Cui * 143ae0078fcSDexuan Cui * When we write apps on the host to connect(), the GUID ServiceID is used. 144ae0078fcSDexuan Cui * When we write apps in Linux VM to connect(), we only need to specify the 145ae0078fcSDexuan Cui * port and the driver will form the GUID and use that to request the host. 146ae0078fcSDexuan Cui * 147ae0078fcSDexuan Cui * From the perspective of Linux VM: 148ae0078fcSDexuan Cui * 1. the local ephemeral port (i.e. the local auto-bound port when we call 149ae0078fcSDexuan Cui * connect() without explicit bind()) is generated by __vsock_bind_stream(), 150ae0078fcSDexuan Cui * and the range is [1024, 0xFFFFFFFF). 151ae0078fcSDexuan Cui * 2. the remote ephemeral port (i.e. the auto-generated remote port for 152ae0078fcSDexuan Cui * a connect request initiated by the host's connect()) is generated by 153ae0078fcSDexuan Cui * hvs_remote_addr_init() and the range is [0x80000000, 0xFFFFFFFF). 154ae0078fcSDexuan Cui */ 155ae0078fcSDexuan Cui 156ae0078fcSDexuan Cui #define MAX_LISTEN_PORT ((u32)0x7FFFFFFF) 157ae0078fcSDexuan Cui #define MAX_VM_LISTEN_PORT MAX_LISTEN_PORT 158ae0078fcSDexuan Cui #define MAX_HOST_LISTEN_PORT MAX_LISTEN_PORT 159ae0078fcSDexuan Cui #define MIN_HOST_EPHEMERAL_PORT (MAX_HOST_LISTEN_PORT + 1) 160ae0078fcSDexuan Cui 161ae0078fcSDexuan Cui /* 00000000-facb-11e6-bd58-64006a7986d3 */ 162ae0078fcSDexuan Cui static const uuid_le srv_id_template = 163ae0078fcSDexuan Cui UUID_LE(0x00000000, 0xfacb, 0x11e6, 0xbd, 0x58, 164ae0078fcSDexuan Cui 0x64, 0x00, 0x6a, 0x79, 0x86, 0xd3); 165ae0078fcSDexuan Cui 166ae0078fcSDexuan Cui static bool is_valid_srv_id(const uuid_le *id) 167ae0078fcSDexuan Cui { 168ae0078fcSDexuan Cui return !memcmp(&id->b[4], &srv_id_template.b[4], sizeof(uuid_le) - 4); 169ae0078fcSDexuan Cui } 170ae0078fcSDexuan Cui 171ae0078fcSDexuan Cui static unsigned int get_port_by_srv_id(const uuid_le *svr_id) 172ae0078fcSDexuan Cui { 173ae0078fcSDexuan Cui return *((unsigned int *)svr_id); 174ae0078fcSDexuan Cui } 175ae0078fcSDexuan Cui 176ae0078fcSDexuan Cui static void hvs_addr_init(struct sockaddr_vm *addr, const uuid_le *svr_id) 177ae0078fcSDexuan Cui { 178ae0078fcSDexuan Cui unsigned int port = get_port_by_srv_id(svr_id); 179ae0078fcSDexuan Cui 180ae0078fcSDexuan Cui vsock_addr_init(addr, VMADDR_CID_ANY, port); 181ae0078fcSDexuan Cui } 182ae0078fcSDexuan Cui 183ae0078fcSDexuan Cui static void hvs_remote_addr_init(struct sockaddr_vm *remote, 184ae0078fcSDexuan Cui struct sockaddr_vm *local) 185ae0078fcSDexuan Cui { 186ae0078fcSDexuan Cui static u32 host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT; 187ae0078fcSDexuan Cui struct sock *sk; 188ae0078fcSDexuan Cui 189ae0078fcSDexuan Cui vsock_addr_init(remote, VMADDR_CID_ANY, VMADDR_PORT_ANY); 190ae0078fcSDexuan Cui 191ae0078fcSDexuan Cui while (1) { 192ae0078fcSDexuan Cui /* Wrap around ? */ 193ae0078fcSDexuan Cui if (host_ephemeral_port < MIN_HOST_EPHEMERAL_PORT || 194ae0078fcSDexuan Cui host_ephemeral_port == VMADDR_PORT_ANY) 195ae0078fcSDexuan Cui host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT; 196ae0078fcSDexuan Cui 197ae0078fcSDexuan Cui remote->svm_port = host_ephemeral_port++; 198ae0078fcSDexuan Cui 199ae0078fcSDexuan Cui sk = vsock_find_connected_socket(remote, local); 200ae0078fcSDexuan Cui if (!sk) { 201ae0078fcSDexuan Cui /* Found an available ephemeral port */ 202ae0078fcSDexuan Cui return; 203ae0078fcSDexuan Cui } 204ae0078fcSDexuan Cui 205ae0078fcSDexuan Cui /* Release refcnt got in vsock_find_connected_socket */ 206ae0078fcSDexuan Cui sock_put(sk); 207ae0078fcSDexuan Cui } 208ae0078fcSDexuan Cui } 209ae0078fcSDexuan Cui 210ae0078fcSDexuan Cui static void hvs_set_channel_pending_send_size(struct vmbus_channel *chan) 211ae0078fcSDexuan Cui { 212ae0078fcSDexuan Cui set_channel_pending_send_size(chan, 213ae0078fcSDexuan Cui HVS_PKT_LEN(HVS_SEND_BUF_SIZE)); 214ae0078fcSDexuan Cui 215ae0078fcSDexuan Cui virt_mb(); 216ae0078fcSDexuan Cui } 217ae0078fcSDexuan Cui 218ae0078fcSDexuan Cui static bool hvs_channel_readable(struct vmbus_channel *chan) 219ae0078fcSDexuan Cui { 220ae0078fcSDexuan Cui u32 readable = hv_get_bytes_to_read(&chan->inbound); 221ae0078fcSDexuan Cui 222ae0078fcSDexuan Cui /* 0-size payload means FIN */ 223ae0078fcSDexuan Cui return readable >= HVS_PKT_LEN(0); 224ae0078fcSDexuan Cui } 225ae0078fcSDexuan Cui 226ae0078fcSDexuan Cui static int hvs_channel_readable_payload(struct vmbus_channel *chan) 227ae0078fcSDexuan Cui { 228ae0078fcSDexuan Cui u32 readable = hv_get_bytes_to_read(&chan->inbound); 229ae0078fcSDexuan Cui 230ae0078fcSDexuan Cui if (readable > HVS_PKT_LEN(0)) { 231ae0078fcSDexuan Cui /* At least we have 1 byte to read. We don't need to return 232ae0078fcSDexuan Cui * the exact readable bytes: see vsock_stream_recvmsg() -> 233ae0078fcSDexuan Cui * vsock_stream_has_data(). 234ae0078fcSDexuan Cui */ 235ae0078fcSDexuan Cui return 1; 236ae0078fcSDexuan Cui } 237ae0078fcSDexuan Cui 238ae0078fcSDexuan Cui if (readable == HVS_PKT_LEN(0)) { 239ae0078fcSDexuan Cui /* 0-size payload means FIN */ 240ae0078fcSDexuan Cui return 0; 241ae0078fcSDexuan Cui } 242ae0078fcSDexuan Cui 243ae0078fcSDexuan Cui /* No payload or FIN */ 244ae0078fcSDexuan Cui return -1; 245ae0078fcSDexuan Cui } 246ae0078fcSDexuan Cui 247ae0078fcSDexuan Cui static size_t hvs_channel_writable_bytes(struct vmbus_channel *chan) 248ae0078fcSDexuan Cui { 249ae0078fcSDexuan Cui u32 writeable = hv_get_bytes_to_write(&chan->outbound); 250ae0078fcSDexuan Cui size_t ret; 251ae0078fcSDexuan Cui 252ae0078fcSDexuan Cui /* The ringbuffer mustn't be 100% full, and we should reserve a 253ae0078fcSDexuan Cui * zero-length-payload packet for the FIN: see hv_ringbuffer_write() 254ae0078fcSDexuan Cui * and hvs_shutdown(). 255ae0078fcSDexuan Cui */ 256ae0078fcSDexuan Cui if (writeable <= HVS_PKT_LEN(1) + HVS_PKT_LEN(0)) 257ae0078fcSDexuan Cui return 0; 258ae0078fcSDexuan Cui 259ae0078fcSDexuan Cui ret = writeable - HVS_PKT_LEN(1) - HVS_PKT_LEN(0); 260ae0078fcSDexuan Cui 261ae0078fcSDexuan Cui return round_down(ret, 8); 262ae0078fcSDexuan Cui } 263ae0078fcSDexuan Cui 264ae0078fcSDexuan Cui static int hvs_send_data(struct vmbus_channel *chan, 265ae0078fcSDexuan Cui struct hvs_send_buf *send_buf, size_t to_write) 266ae0078fcSDexuan Cui { 267ae0078fcSDexuan Cui send_buf->hdr.pkt_type = 1; 268ae0078fcSDexuan Cui send_buf->hdr.data_size = to_write; 269ae0078fcSDexuan Cui return vmbus_sendpacket(chan, &send_buf->hdr, 270ae0078fcSDexuan Cui sizeof(send_buf->hdr) + to_write, 271ae0078fcSDexuan Cui 0, VM_PKT_DATA_INBAND, 0); 272ae0078fcSDexuan Cui } 273ae0078fcSDexuan Cui 274ae0078fcSDexuan Cui static void hvs_channel_cb(void *ctx) 275ae0078fcSDexuan Cui { 276ae0078fcSDexuan Cui struct sock *sk = (struct sock *)ctx; 277ae0078fcSDexuan Cui struct vsock_sock *vsk = vsock_sk(sk); 278ae0078fcSDexuan Cui struct hvsock *hvs = vsk->trans; 279ae0078fcSDexuan Cui struct vmbus_channel *chan = hvs->chan; 280ae0078fcSDexuan Cui 281ae0078fcSDexuan Cui if (hvs_channel_readable(chan)) 282ae0078fcSDexuan Cui sk->sk_data_ready(sk); 283ae0078fcSDexuan Cui 284ae0078fcSDexuan Cui if (hv_get_bytes_to_write(&chan->outbound) > 0) 285ae0078fcSDexuan Cui sk->sk_write_space(sk); 286ae0078fcSDexuan Cui } 287ae0078fcSDexuan Cui 288a9eeb998SSunil Muthuswamy static void hvs_do_close_lock_held(struct vsock_sock *vsk, 289a9eeb998SSunil Muthuswamy bool cancel_timeout) 290a9eeb998SSunil Muthuswamy { 291a9eeb998SSunil Muthuswamy struct sock *sk = sk_vsock(vsk); 292a9eeb998SSunil Muthuswamy 293a9eeb998SSunil Muthuswamy sock_set_flag(sk, SOCK_DONE); 294a9eeb998SSunil Muthuswamy vsk->peer_shutdown = SHUTDOWN_MASK; 295a9eeb998SSunil Muthuswamy if (vsock_stream_has_data(vsk) <= 0) 296a9eeb998SSunil Muthuswamy sk->sk_state = TCP_CLOSING; 297a9eeb998SSunil Muthuswamy sk->sk_state_change(sk); 298a9eeb998SSunil Muthuswamy if (vsk->close_work_scheduled && 299a9eeb998SSunil Muthuswamy (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) { 300a9eeb998SSunil Muthuswamy vsk->close_work_scheduled = false; 301a9eeb998SSunil Muthuswamy vsock_remove_sock(vsk); 302a9eeb998SSunil Muthuswamy 303a9eeb998SSunil Muthuswamy /* Release the reference taken while scheduling the timeout */ 304a9eeb998SSunil Muthuswamy sock_put(sk); 305a9eeb998SSunil Muthuswamy } 306a9eeb998SSunil Muthuswamy } 307a9eeb998SSunil Muthuswamy 308ae0078fcSDexuan Cui static void hvs_close_connection(struct vmbus_channel *chan) 309ae0078fcSDexuan Cui { 310ae0078fcSDexuan Cui struct sock *sk = get_per_channel_state(chan); 311ae0078fcSDexuan Cui 312b4562ca7SDexuan Cui lock_sock(sk); 313a9eeb998SSunil Muthuswamy hvs_do_close_lock_held(vsock_sk(sk), true); 314b4562ca7SDexuan Cui release_sock(sk); 315685703b4SDexuan Cui 316685703b4SDexuan Cui /* Release the refcnt for the channel that's opened in 317685703b4SDexuan Cui * hvs_open_connection(). 318685703b4SDexuan Cui */ 319685703b4SDexuan Cui sock_put(sk); 320ae0078fcSDexuan Cui } 321ae0078fcSDexuan Cui 322ae0078fcSDexuan Cui static void hvs_open_connection(struct vmbus_channel *chan) 323ae0078fcSDexuan Cui { 324ae0078fcSDexuan Cui uuid_le *if_instance, *if_type; 325ae0078fcSDexuan Cui unsigned char conn_from_host; 326ae0078fcSDexuan Cui 327ae0078fcSDexuan Cui struct sockaddr_vm addr; 328ae0078fcSDexuan Cui struct sock *sk, *new = NULL; 329ac383f58SSunil Muthuswamy struct vsock_sock *vnew = NULL; 330ac383f58SSunil Muthuswamy struct hvsock *hvs = NULL; 331ac383f58SSunil Muthuswamy struct hvsock *hvs_new = NULL; 332ac383f58SSunil Muthuswamy int rcvbuf; 333ae0078fcSDexuan Cui int ret; 334ac383f58SSunil Muthuswamy int sndbuf; 335ae0078fcSDexuan Cui 336ae0078fcSDexuan Cui if_type = &chan->offermsg.offer.if_type; 337ae0078fcSDexuan Cui if_instance = &chan->offermsg.offer.if_instance; 338ae0078fcSDexuan Cui conn_from_host = chan->offermsg.offer.u.pipe.user_def[0]; 339ae0078fcSDexuan Cui 340ae0078fcSDexuan Cui /* The host or the VM should only listen on a port in 341ae0078fcSDexuan Cui * [0, MAX_LISTEN_PORT] 342ae0078fcSDexuan Cui */ 343ae0078fcSDexuan Cui if (!is_valid_srv_id(if_type) || 344ae0078fcSDexuan Cui get_port_by_srv_id(if_type) > MAX_LISTEN_PORT) 345ae0078fcSDexuan Cui return; 346ae0078fcSDexuan Cui 347ae0078fcSDexuan Cui hvs_addr_init(&addr, conn_from_host ? if_type : if_instance); 348ae0078fcSDexuan Cui sk = vsock_find_bound_socket(&addr); 349ae0078fcSDexuan Cui if (!sk) 350ae0078fcSDexuan Cui return; 351ae0078fcSDexuan Cui 352b4562ca7SDexuan Cui lock_sock(sk); 3533b4477d2SStefan Hajnoczi if ((conn_from_host && sk->sk_state != TCP_LISTEN) || 3543b4477d2SStefan Hajnoczi (!conn_from_host && sk->sk_state != TCP_SYN_SENT)) 355ae0078fcSDexuan Cui goto out; 356ae0078fcSDexuan Cui 357ae0078fcSDexuan Cui if (conn_from_host) { 358ae0078fcSDexuan Cui if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) 359ae0078fcSDexuan Cui goto out; 360ae0078fcSDexuan Cui 361ae0078fcSDexuan Cui new = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, 362ae0078fcSDexuan Cui sk->sk_type, 0); 363ae0078fcSDexuan Cui if (!new) 364ae0078fcSDexuan Cui goto out; 365ae0078fcSDexuan Cui 3663b4477d2SStefan Hajnoczi new->sk_state = TCP_SYN_SENT; 367ae0078fcSDexuan Cui vnew = vsock_sk(new); 368ae0078fcSDexuan Cui hvs_new = vnew->trans; 369ae0078fcSDexuan Cui hvs_new->chan = chan; 370ae0078fcSDexuan Cui } else { 371ae0078fcSDexuan Cui hvs = vsock_sk(sk)->trans; 372ae0078fcSDexuan Cui hvs->chan = chan; 373ae0078fcSDexuan Cui } 374ae0078fcSDexuan Cui 375ae0078fcSDexuan Cui set_channel_read_mode(chan, HV_CALL_DIRECT); 376ac383f58SSunil Muthuswamy 377ac383f58SSunil Muthuswamy /* Use the socket buffer sizes as hints for the VMBUS ring size. For 378ac383f58SSunil Muthuswamy * server side sockets, 'sk' is the parent socket and thus, this will 379ac383f58SSunil Muthuswamy * allow the child sockets to inherit the size from the parent. Keep 380ac383f58SSunil Muthuswamy * the mins to the default value and align to page size as per VMBUS 381ac383f58SSunil Muthuswamy * requirements. 382ac383f58SSunil Muthuswamy * For the max, the socket core library will limit the socket buffer 383ac383f58SSunil Muthuswamy * size that can be set by the user, but, since currently, the hv_sock 384ac383f58SSunil Muthuswamy * VMBUS ring buffer is physically contiguous allocation, restrict it 385ac383f58SSunil Muthuswamy * further. 386ac383f58SSunil Muthuswamy * Older versions of hv_sock host side code cannot handle bigger VMBUS 387ac383f58SSunil Muthuswamy * ring buffer size. Use the version number to limit the change to newer 388ac383f58SSunil Muthuswamy * versions. 389ac383f58SSunil Muthuswamy */ 390ac383f58SSunil Muthuswamy if (vmbus_proto_version < VERSION_WIN10_V5) { 391ac383f58SSunil Muthuswamy sndbuf = RINGBUFFER_HVS_SND_SIZE; 392ac383f58SSunil Muthuswamy rcvbuf = RINGBUFFER_HVS_RCV_SIZE; 393ac383f58SSunil Muthuswamy } else { 394ac383f58SSunil Muthuswamy sndbuf = max_t(int, sk->sk_sndbuf, RINGBUFFER_HVS_SND_SIZE); 395ac383f58SSunil Muthuswamy sndbuf = min_t(int, sndbuf, RINGBUFFER_HVS_MAX_SIZE); 396ac383f58SSunil Muthuswamy sndbuf = ALIGN(sndbuf, PAGE_SIZE); 397ac383f58SSunil Muthuswamy rcvbuf = max_t(int, sk->sk_rcvbuf, RINGBUFFER_HVS_RCV_SIZE); 398ac383f58SSunil Muthuswamy rcvbuf = min_t(int, rcvbuf, RINGBUFFER_HVS_MAX_SIZE); 399ac383f58SSunil Muthuswamy rcvbuf = ALIGN(rcvbuf, PAGE_SIZE); 400ac383f58SSunil Muthuswamy } 401ac383f58SSunil Muthuswamy 402ac383f58SSunil Muthuswamy ret = vmbus_open(chan, sndbuf, rcvbuf, NULL, 0, hvs_channel_cb, 403ac383f58SSunil Muthuswamy conn_from_host ? new : sk); 404ae0078fcSDexuan Cui if (ret != 0) { 405ae0078fcSDexuan Cui if (conn_from_host) { 406ae0078fcSDexuan Cui hvs_new->chan = NULL; 407ae0078fcSDexuan Cui sock_put(new); 408ae0078fcSDexuan Cui } else { 409ae0078fcSDexuan Cui hvs->chan = NULL; 410ae0078fcSDexuan Cui } 411ae0078fcSDexuan Cui goto out; 412ae0078fcSDexuan Cui } 413ae0078fcSDexuan Cui 414ae0078fcSDexuan Cui set_per_channel_state(chan, conn_from_host ? new : sk); 415685703b4SDexuan Cui 416685703b4SDexuan Cui /* This reference will be dropped by hvs_close_connection(). */ 417685703b4SDexuan Cui sock_hold(conn_from_host ? new : sk); 418ae0078fcSDexuan Cui vmbus_set_chn_rescind_callback(chan, hvs_close_connection); 419ae0078fcSDexuan Cui 420cb359b60SSunil Muthuswamy /* Set the pending send size to max packet size to always get 421cb359b60SSunil Muthuswamy * notifications from the host when there is enough writable space. 422cb359b60SSunil Muthuswamy * The host is optimized to send notifications only when the pending 423cb359b60SSunil Muthuswamy * size boundary is crossed, and not always. 424cb359b60SSunil Muthuswamy */ 425cb359b60SSunil Muthuswamy hvs_set_channel_pending_send_size(chan); 426cb359b60SSunil Muthuswamy 427ae0078fcSDexuan Cui if (conn_from_host) { 4283b4477d2SStefan Hajnoczi new->sk_state = TCP_ESTABLISHED; 429ae0078fcSDexuan Cui sk->sk_ack_backlog++; 430ae0078fcSDexuan Cui 431ae0078fcSDexuan Cui hvs_addr_init(&vnew->local_addr, if_type); 432ae0078fcSDexuan Cui hvs_remote_addr_init(&vnew->remote_addr, &vnew->local_addr); 433ae0078fcSDexuan Cui 434ae0078fcSDexuan Cui hvs_new->vm_srv_id = *if_type; 435ae0078fcSDexuan Cui hvs_new->host_srv_id = *if_instance; 436ae0078fcSDexuan Cui 437ae0078fcSDexuan Cui vsock_insert_connected(vnew); 438ae0078fcSDexuan Cui 439ae0078fcSDexuan Cui vsock_enqueue_accept(sk, new); 440ae0078fcSDexuan Cui } else { 4413b4477d2SStefan Hajnoczi sk->sk_state = TCP_ESTABLISHED; 442ae0078fcSDexuan Cui sk->sk_socket->state = SS_CONNECTED; 443ae0078fcSDexuan Cui 444ae0078fcSDexuan Cui vsock_insert_connected(vsock_sk(sk)); 445ae0078fcSDexuan Cui } 446ae0078fcSDexuan Cui 447ae0078fcSDexuan Cui sk->sk_state_change(sk); 448ae0078fcSDexuan Cui 449ae0078fcSDexuan Cui out: 450ae0078fcSDexuan Cui /* Release refcnt obtained when we called vsock_find_bound_socket() */ 451ae0078fcSDexuan Cui sock_put(sk); 452b4562ca7SDexuan Cui 453b4562ca7SDexuan Cui release_sock(sk); 454ae0078fcSDexuan Cui } 455ae0078fcSDexuan Cui 456ae0078fcSDexuan Cui static u32 hvs_get_local_cid(void) 457ae0078fcSDexuan Cui { 458ae0078fcSDexuan Cui return VMADDR_CID_ANY; 459ae0078fcSDexuan Cui } 460ae0078fcSDexuan Cui 461ae0078fcSDexuan Cui static int hvs_sock_init(struct vsock_sock *vsk, struct vsock_sock *psk) 462ae0078fcSDexuan Cui { 463ae0078fcSDexuan Cui struct hvsock *hvs; 464ac383f58SSunil Muthuswamy struct sock *sk = sk_vsock(vsk); 465ae0078fcSDexuan Cui 466ae0078fcSDexuan Cui hvs = kzalloc(sizeof(*hvs), GFP_KERNEL); 467ae0078fcSDexuan Cui if (!hvs) 468ae0078fcSDexuan Cui return -ENOMEM; 469ae0078fcSDexuan Cui 470ae0078fcSDexuan Cui vsk->trans = hvs; 471ae0078fcSDexuan Cui hvs->vsk = vsk; 472ac383f58SSunil Muthuswamy sk->sk_sndbuf = RINGBUFFER_HVS_SND_SIZE; 473ac383f58SSunil Muthuswamy sk->sk_rcvbuf = RINGBUFFER_HVS_RCV_SIZE; 474ae0078fcSDexuan Cui return 0; 475ae0078fcSDexuan Cui } 476ae0078fcSDexuan Cui 477ae0078fcSDexuan Cui static int hvs_connect(struct vsock_sock *vsk) 478ae0078fcSDexuan Cui { 479ae0078fcSDexuan Cui union hvs_service_id vm, host; 480ae0078fcSDexuan Cui struct hvsock *h = vsk->trans; 481ae0078fcSDexuan Cui 482ae0078fcSDexuan Cui vm.srv_id = srv_id_template; 483ae0078fcSDexuan Cui vm.svm_port = vsk->local_addr.svm_port; 484ae0078fcSDexuan Cui h->vm_srv_id = vm.srv_id; 485ae0078fcSDexuan Cui 486ae0078fcSDexuan Cui host.srv_id = srv_id_template; 487ae0078fcSDexuan Cui host.svm_port = vsk->remote_addr.svm_port; 488ae0078fcSDexuan Cui h->host_srv_id = host.srv_id; 489ae0078fcSDexuan Cui 490ae0078fcSDexuan Cui return vmbus_send_tl_connect_request(&h->vm_srv_id, &h->host_srv_id); 491ae0078fcSDexuan Cui } 492ae0078fcSDexuan Cui 493a9eeb998SSunil Muthuswamy static void hvs_shutdown_lock_held(struct hvsock *hvs, int mode) 494a9eeb998SSunil Muthuswamy { 495a9eeb998SSunil Muthuswamy struct vmpipe_proto_header hdr; 496a9eeb998SSunil Muthuswamy 497a9eeb998SSunil Muthuswamy if (hvs->fin_sent || !hvs->chan) 498a9eeb998SSunil Muthuswamy return; 499a9eeb998SSunil Muthuswamy 500a9eeb998SSunil Muthuswamy /* It can't fail: see hvs_channel_writable_bytes(). */ 501a9eeb998SSunil Muthuswamy (void)hvs_send_data(hvs->chan, (struct hvs_send_buf *)&hdr, 0); 502a9eeb998SSunil Muthuswamy hvs->fin_sent = true; 503a9eeb998SSunil Muthuswamy } 504a9eeb998SSunil Muthuswamy 505ae0078fcSDexuan Cui static int hvs_shutdown(struct vsock_sock *vsk, int mode) 506ae0078fcSDexuan Cui { 507ae0078fcSDexuan Cui struct sock *sk = sk_vsock(vsk); 508ae0078fcSDexuan Cui 509ae0078fcSDexuan Cui if (!(mode & SEND_SHUTDOWN)) 510ae0078fcSDexuan Cui return 0; 511ae0078fcSDexuan Cui 512ae0078fcSDexuan Cui lock_sock(sk); 513a9eeb998SSunil Muthuswamy hvs_shutdown_lock_held(vsk->trans, mode); 514ae0078fcSDexuan Cui release_sock(sk); 515ae0078fcSDexuan Cui return 0; 516ae0078fcSDexuan Cui } 517ae0078fcSDexuan Cui 518a9eeb998SSunil Muthuswamy static void hvs_close_timeout(struct work_struct *work) 519a9eeb998SSunil Muthuswamy { 520a9eeb998SSunil Muthuswamy struct vsock_sock *vsk = 521a9eeb998SSunil Muthuswamy container_of(work, struct vsock_sock, close_work.work); 522a9eeb998SSunil Muthuswamy struct sock *sk = sk_vsock(vsk); 523a9eeb998SSunil Muthuswamy 524a9eeb998SSunil Muthuswamy sock_hold(sk); 525a9eeb998SSunil Muthuswamy lock_sock(sk); 526a9eeb998SSunil Muthuswamy if (!sock_flag(sk, SOCK_DONE)) 527a9eeb998SSunil Muthuswamy hvs_do_close_lock_held(vsk, false); 528a9eeb998SSunil Muthuswamy 529a9eeb998SSunil Muthuswamy vsk->close_work_scheduled = false; 530a9eeb998SSunil Muthuswamy release_sock(sk); 531a9eeb998SSunil Muthuswamy sock_put(sk); 532a9eeb998SSunil Muthuswamy } 533a9eeb998SSunil Muthuswamy 534a9eeb998SSunil Muthuswamy /* Returns true, if it is safe to remove socket; false otherwise */ 535a9eeb998SSunil Muthuswamy static bool hvs_close_lock_held(struct vsock_sock *vsk) 536a9eeb998SSunil Muthuswamy { 537a9eeb998SSunil Muthuswamy struct sock *sk = sk_vsock(vsk); 538a9eeb998SSunil Muthuswamy 539a9eeb998SSunil Muthuswamy if (!(sk->sk_state == TCP_ESTABLISHED || 540a9eeb998SSunil Muthuswamy sk->sk_state == TCP_CLOSING)) 541a9eeb998SSunil Muthuswamy return true; 542a9eeb998SSunil Muthuswamy 543a9eeb998SSunil Muthuswamy if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK) 544a9eeb998SSunil Muthuswamy hvs_shutdown_lock_held(vsk->trans, SHUTDOWN_MASK); 545a9eeb998SSunil Muthuswamy 546a9eeb998SSunil Muthuswamy if (sock_flag(sk, SOCK_DONE)) 547a9eeb998SSunil Muthuswamy return true; 548a9eeb998SSunil Muthuswamy 549a9eeb998SSunil Muthuswamy /* This reference will be dropped by the delayed close routine */ 550a9eeb998SSunil Muthuswamy sock_hold(sk); 551a9eeb998SSunil Muthuswamy INIT_DELAYED_WORK(&vsk->close_work, hvs_close_timeout); 552a9eeb998SSunil Muthuswamy vsk->close_work_scheduled = true; 553a9eeb998SSunil Muthuswamy schedule_delayed_work(&vsk->close_work, HVS_CLOSE_TIMEOUT); 554a9eeb998SSunil Muthuswamy return false; 555a9eeb998SSunil Muthuswamy } 556a9eeb998SSunil Muthuswamy 557ae0078fcSDexuan Cui static void hvs_release(struct vsock_sock *vsk) 558ae0078fcSDexuan Cui { 559b4562ca7SDexuan Cui struct sock *sk = sk_vsock(vsk); 560a9eeb998SSunil Muthuswamy bool remove_sock; 561ae0078fcSDexuan Cui 562b4562ca7SDexuan Cui lock_sock(sk); 563a9eeb998SSunil Muthuswamy remove_sock = hvs_close_lock_held(vsk); 564b4562ca7SDexuan Cui release_sock(sk); 565a9eeb998SSunil Muthuswamy if (remove_sock) 566a9eeb998SSunil Muthuswamy vsock_remove_sock(vsk); 567ae0078fcSDexuan Cui } 568ae0078fcSDexuan Cui 569ae0078fcSDexuan Cui static void hvs_destruct(struct vsock_sock *vsk) 570ae0078fcSDexuan Cui { 571ae0078fcSDexuan Cui struct hvsock *hvs = vsk->trans; 572ae0078fcSDexuan Cui struct vmbus_channel *chan = hvs->chan; 573ae0078fcSDexuan Cui 574ae0078fcSDexuan Cui if (chan) 575ae0078fcSDexuan Cui vmbus_hvsock_device_unregister(chan); 576ae0078fcSDexuan Cui 577ae0078fcSDexuan Cui kfree(hvs); 578ae0078fcSDexuan Cui } 579ae0078fcSDexuan Cui 580ae0078fcSDexuan Cui static int hvs_dgram_bind(struct vsock_sock *vsk, struct sockaddr_vm *addr) 581ae0078fcSDexuan Cui { 582ae0078fcSDexuan Cui return -EOPNOTSUPP; 583ae0078fcSDexuan Cui } 584ae0078fcSDexuan Cui 585ae0078fcSDexuan Cui static int hvs_dgram_dequeue(struct vsock_sock *vsk, struct msghdr *msg, 586ae0078fcSDexuan Cui size_t len, int flags) 587ae0078fcSDexuan Cui { 588ae0078fcSDexuan Cui return -EOPNOTSUPP; 589ae0078fcSDexuan Cui } 590ae0078fcSDexuan Cui 591ae0078fcSDexuan Cui static int hvs_dgram_enqueue(struct vsock_sock *vsk, 592ae0078fcSDexuan Cui struct sockaddr_vm *remote, struct msghdr *msg, 593ae0078fcSDexuan Cui size_t dgram_len) 594ae0078fcSDexuan Cui { 595ae0078fcSDexuan Cui return -EOPNOTSUPP; 596ae0078fcSDexuan Cui } 597ae0078fcSDexuan Cui 598ae0078fcSDexuan Cui static bool hvs_dgram_allow(u32 cid, u32 port) 599ae0078fcSDexuan Cui { 600ae0078fcSDexuan Cui return false; 601ae0078fcSDexuan Cui } 602ae0078fcSDexuan Cui 603ae0078fcSDexuan Cui static int hvs_update_recv_data(struct hvsock *hvs) 604ae0078fcSDexuan Cui { 605ae0078fcSDexuan Cui struct hvs_recv_buf *recv_buf; 606ae0078fcSDexuan Cui u32 payload_len; 607ae0078fcSDexuan Cui 608ae0078fcSDexuan Cui recv_buf = (struct hvs_recv_buf *)(hvs->recv_desc + 1); 609ae0078fcSDexuan Cui payload_len = recv_buf->hdr.data_size; 610ae0078fcSDexuan Cui 611ae0078fcSDexuan Cui if (payload_len > HVS_MTU_SIZE) 612ae0078fcSDexuan Cui return -EIO; 613ae0078fcSDexuan Cui 614ae0078fcSDexuan Cui if (payload_len == 0) 615ae0078fcSDexuan Cui hvs->vsk->peer_shutdown |= SEND_SHUTDOWN; 616ae0078fcSDexuan Cui 617ae0078fcSDexuan Cui hvs->recv_data_len = payload_len; 618ae0078fcSDexuan Cui hvs->recv_data_off = 0; 619ae0078fcSDexuan Cui 620ae0078fcSDexuan Cui return 0; 621ae0078fcSDexuan Cui } 622ae0078fcSDexuan Cui 623ae0078fcSDexuan Cui static ssize_t hvs_stream_dequeue(struct vsock_sock *vsk, struct msghdr *msg, 624ae0078fcSDexuan Cui size_t len, int flags) 625ae0078fcSDexuan Cui { 626ae0078fcSDexuan Cui struct hvsock *hvs = vsk->trans; 627ae0078fcSDexuan Cui bool need_refill = !hvs->recv_desc; 628ae0078fcSDexuan Cui struct hvs_recv_buf *recv_buf; 629ae0078fcSDexuan Cui u32 to_read; 630ae0078fcSDexuan Cui int ret; 631ae0078fcSDexuan Cui 632ae0078fcSDexuan Cui if (flags & MSG_PEEK) 633ae0078fcSDexuan Cui return -EOPNOTSUPP; 634ae0078fcSDexuan Cui 635ae0078fcSDexuan Cui if (need_refill) { 636ae0078fcSDexuan Cui hvs->recv_desc = hv_pkt_iter_first(hvs->chan); 637ae0078fcSDexuan Cui ret = hvs_update_recv_data(hvs); 638ae0078fcSDexuan Cui if (ret) 639ae0078fcSDexuan Cui return ret; 640ae0078fcSDexuan Cui } 641ae0078fcSDexuan Cui 642ae0078fcSDexuan Cui recv_buf = (struct hvs_recv_buf *)(hvs->recv_desc + 1); 643ae0078fcSDexuan Cui to_read = min_t(u32, len, hvs->recv_data_len); 644ae0078fcSDexuan Cui ret = memcpy_to_msg(msg, recv_buf->data + hvs->recv_data_off, to_read); 645ae0078fcSDexuan Cui if (ret != 0) 646ae0078fcSDexuan Cui return ret; 647ae0078fcSDexuan Cui 648ae0078fcSDexuan Cui hvs->recv_data_len -= to_read; 649ae0078fcSDexuan Cui if (hvs->recv_data_len == 0) { 650ae0078fcSDexuan Cui hvs->recv_desc = hv_pkt_iter_next(hvs->chan, hvs->recv_desc); 651ae0078fcSDexuan Cui if (hvs->recv_desc) { 652ae0078fcSDexuan Cui ret = hvs_update_recv_data(hvs); 653ae0078fcSDexuan Cui if (ret) 654ae0078fcSDexuan Cui return ret; 655ae0078fcSDexuan Cui } 656ae0078fcSDexuan Cui } else { 657ae0078fcSDexuan Cui hvs->recv_data_off += to_read; 658ae0078fcSDexuan Cui } 659ae0078fcSDexuan Cui 660ae0078fcSDexuan Cui return to_read; 661ae0078fcSDexuan Cui } 662ae0078fcSDexuan Cui 663ae0078fcSDexuan Cui static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg, 664ae0078fcSDexuan Cui size_t len) 665ae0078fcSDexuan Cui { 666ae0078fcSDexuan Cui struct hvsock *hvs = vsk->trans; 667ae0078fcSDexuan Cui struct vmbus_channel *chan = hvs->chan; 668ae0078fcSDexuan Cui struct hvs_send_buf *send_buf; 66914a1eaa8SSunil Muthuswamy ssize_t to_write, max_writable; 67014a1eaa8SSunil Muthuswamy ssize_t ret = 0; 67114a1eaa8SSunil Muthuswamy ssize_t bytes_written = 0; 672ae0078fcSDexuan Cui 673ae0078fcSDexuan Cui BUILD_BUG_ON(sizeof(*send_buf) != PAGE_SIZE_4K); 674ae0078fcSDexuan Cui 675ae0078fcSDexuan Cui send_buf = kmalloc(sizeof(*send_buf), GFP_KERNEL); 676ae0078fcSDexuan Cui if (!send_buf) 677ae0078fcSDexuan Cui return -ENOMEM; 678ae0078fcSDexuan Cui 67914a1eaa8SSunil Muthuswamy /* Reader(s) could be draining data from the channel as we write. 68014a1eaa8SSunil Muthuswamy * Maximize bandwidth, by iterating until the channel is found to be 68114a1eaa8SSunil Muthuswamy * full. 68214a1eaa8SSunil Muthuswamy */ 68314a1eaa8SSunil Muthuswamy while (len) { 684ae0078fcSDexuan Cui max_writable = hvs_channel_writable_bytes(chan); 68514a1eaa8SSunil Muthuswamy if (!max_writable) 68614a1eaa8SSunil Muthuswamy break; 687ae0078fcSDexuan Cui to_write = min_t(ssize_t, len, max_writable); 688ae0078fcSDexuan Cui to_write = min_t(ssize_t, to_write, HVS_SEND_BUF_SIZE); 68914a1eaa8SSunil Muthuswamy /* memcpy_from_msg is safe for loop as it advances the offsets 69014a1eaa8SSunil Muthuswamy * within the message iterator. 69114a1eaa8SSunil Muthuswamy */ 692ae0078fcSDexuan Cui ret = memcpy_from_msg(send_buf->data, msg, to_write); 693ae0078fcSDexuan Cui if (ret < 0) 694ae0078fcSDexuan Cui goto out; 695ae0078fcSDexuan Cui 696ae0078fcSDexuan Cui ret = hvs_send_data(hvs->chan, send_buf, to_write); 697ae0078fcSDexuan Cui if (ret < 0) 698ae0078fcSDexuan Cui goto out; 699ae0078fcSDexuan Cui 70014a1eaa8SSunil Muthuswamy bytes_written += to_write; 70114a1eaa8SSunil Muthuswamy len -= to_write; 70214a1eaa8SSunil Muthuswamy } 703ae0078fcSDexuan Cui out: 70414a1eaa8SSunil Muthuswamy /* If any data has been sent, return that */ 70514a1eaa8SSunil Muthuswamy if (bytes_written) 70614a1eaa8SSunil Muthuswamy ret = bytes_written; 707ae0078fcSDexuan Cui kfree(send_buf); 708ae0078fcSDexuan Cui return ret; 709ae0078fcSDexuan Cui } 710ae0078fcSDexuan Cui 711ae0078fcSDexuan Cui static s64 hvs_stream_has_data(struct vsock_sock *vsk) 712ae0078fcSDexuan Cui { 713ae0078fcSDexuan Cui struct hvsock *hvs = vsk->trans; 714ae0078fcSDexuan Cui s64 ret; 715ae0078fcSDexuan Cui 716ae0078fcSDexuan Cui if (hvs->recv_data_len > 0) 717ae0078fcSDexuan Cui return 1; 718ae0078fcSDexuan Cui 719ae0078fcSDexuan Cui switch (hvs_channel_readable_payload(hvs->chan)) { 720ae0078fcSDexuan Cui case 1: 721ae0078fcSDexuan Cui ret = 1; 722ae0078fcSDexuan Cui break; 723ae0078fcSDexuan Cui case 0: 724ae0078fcSDexuan Cui vsk->peer_shutdown |= SEND_SHUTDOWN; 725ae0078fcSDexuan Cui ret = 0; 726ae0078fcSDexuan Cui break; 727ae0078fcSDexuan Cui default: /* -1 */ 728ae0078fcSDexuan Cui ret = 0; 729ae0078fcSDexuan Cui break; 730ae0078fcSDexuan Cui } 731ae0078fcSDexuan Cui 732ae0078fcSDexuan Cui return ret; 733ae0078fcSDexuan Cui } 734ae0078fcSDexuan Cui 735ae0078fcSDexuan Cui static s64 hvs_stream_has_space(struct vsock_sock *vsk) 736ae0078fcSDexuan Cui { 737ae0078fcSDexuan Cui struct hvsock *hvs = vsk->trans; 738ae0078fcSDexuan Cui 739cb359b60SSunil Muthuswamy return hvs_channel_writable_bytes(hvs->chan); 740ae0078fcSDexuan Cui } 741ae0078fcSDexuan Cui 742ae0078fcSDexuan Cui static u64 hvs_stream_rcvhiwat(struct vsock_sock *vsk) 743ae0078fcSDexuan Cui { 744ae0078fcSDexuan Cui return HVS_MTU_SIZE + 1; 745ae0078fcSDexuan Cui } 746ae0078fcSDexuan Cui 747ae0078fcSDexuan Cui static bool hvs_stream_is_active(struct vsock_sock *vsk) 748ae0078fcSDexuan Cui { 749ae0078fcSDexuan Cui struct hvsock *hvs = vsk->trans; 750ae0078fcSDexuan Cui 751ae0078fcSDexuan Cui return hvs->chan != NULL; 752ae0078fcSDexuan Cui } 753ae0078fcSDexuan Cui 754ae0078fcSDexuan Cui static bool hvs_stream_allow(u32 cid, u32 port) 755ae0078fcSDexuan Cui { 756ae0078fcSDexuan Cui /* The host's port range [MIN_HOST_EPHEMERAL_PORT, 0xFFFFFFFF) is 757ae0078fcSDexuan Cui * reserved as ephemeral ports, which are used as the host's ports 758ae0078fcSDexuan Cui * when the host initiates connections. 759ae0078fcSDexuan Cui * 760ae0078fcSDexuan Cui * Perform this check in the guest so an immediate error is produced 761ae0078fcSDexuan Cui * instead of a timeout. 762ae0078fcSDexuan Cui */ 763ae0078fcSDexuan Cui if (port > MAX_HOST_LISTEN_PORT) 764ae0078fcSDexuan Cui return false; 765ae0078fcSDexuan Cui 766ae0078fcSDexuan Cui if (cid == VMADDR_CID_HOST) 767ae0078fcSDexuan Cui return true; 768ae0078fcSDexuan Cui 769ae0078fcSDexuan Cui return false; 770ae0078fcSDexuan Cui } 771ae0078fcSDexuan Cui 772ae0078fcSDexuan Cui static 773ae0078fcSDexuan Cui int hvs_notify_poll_in(struct vsock_sock *vsk, size_t target, bool *readable) 774ae0078fcSDexuan Cui { 775ae0078fcSDexuan Cui struct hvsock *hvs = vsk->trans; 776ae0078fcSDexuan Cui 777ae0078fcSDexuan Cui *readable = hvs_channel_readable(hvs->chan); 778ae0078fcSDexuan Cui return 0; 779ae0078fcSDexuan Cui } 780ae0078fcSDexuan Cui 781ae0078fcSDexuan Cui static 782ae0078fcSDexuan Cui int hvs_notify_poll_out(struct vsock_sock *vsk, size_t target, bool *writable) 783ae0078fcSDexuan Cui { 784ae0078fcSDexuan Cui *writable = hvs_stream_has_space(vsk) > 0; 785ae0078fcSDexuan Cui 786ae0078fcSDexuan Cui return 0; 787ae0078fcSDexuan Cui } 788ae0078fcSDexuan Cui 789ae0078fcSDexuan Cui static 790ae0078fcSDexuan Cui int hvs_notify_recv_init(struct vsock_sock *vsk, size_t target, 791ae0078fcSDexuan Cui struct vsock_transport_recv_notify_data *d) 792ae0078fcSDexuan Cui { 793ae0078fcSDexuan Cui return 0; 794ae0078fcSDexuan Cui } 795ae0078fcSDexuan Cui 796ae0078fcSDexuan Cui static 797ae0078fcSDexuan Cui int hvs_notify_recv_pre_block(struct vsock_sock *vsk, size_t target, 798ae0078fcSDexuan Cui struct vsock_transport_recv_notify_data *d) 799ae0078fcSDexuan Cui { 800ae0078fcSDexuan Cui return 0; 801ae0078fcSDexuan Cui } 802ae0078fcSDexuan Cui 803ae0078fcSDexuan Cui static 804ae0078fcSDexuan Cui int hvs_notify_recv_pre_dequeue(struct vsock_sock *vsk, size_t target, 805ae0078fcSDexuan Cui struct vsock_transport_recv_notify_data *d) 806ae0078fcSDexuan Cui { 807ae0078fcSDexuan Cui return 0; 808ae0078fcSDexuan Cui } 809ae0078fcSDexuan Cui 810ae0078fcSDexuan Cui static 811ae0078fcSDexuan Cui int hvs_notify_recv_post_dequeue(struct vsock_sock *vsk, size_t target, 812ae0078fcSDexuan Cui ssize_t copied, bool data_read, 813ae0078fcSDexuan Cui struct vsock_transport_recv_notify_data *d) 814ae0078fcSDexuan Cui { 815ae0078fcSDexuan Cui return 0; 816ae0078fcSDexuan Cui } 817ae0078fcSDexuan Cui 818ae0078fcSDexuan Cui static 819ae0078fcSDexuan Cui int hvs_notify_send_init(struct vsock_sock *vsk, 820ae0078fcSDexuan Cui struct vsock_transport_send_notify_data *d) 821ae0078fcSDexuan Cui { 822ae0078fcSDexuan Cui return 0; 823ae0078fcSDexuan Cui } 824ae0078fcSDexuan Cui 825ae0078fcSDexuan Cui static 826ae0078fcSDexuan Cui int hvs_notify_send_pre_block(struct vsock_sock *vsk, 827ae0078fcSDexuan Cui struct vsock_transport_send_notify_data *d) 828ae0078fcSDexuan Cui { 829ae0078fcSDexuan Cui return 0; 830ae0078fcSDexuan Cui } 831ae0078fcSDexuan Cui 832ae0078fcSDexuan Cui static 833ae0078fcSDexuan Cui int hvs_notify_send_pre_enqueue(struct vsock_sock *vsk, 834ae0078fcSDexuan Cui struct vsock_transport_send_notify_data *d) 835ae0078fcSDexuan Cui { 836ae0078fcSDexuan Cui return 0; 837ae0078fcSDexuan Cui } 838ae0078fcSDexuan Cui 839ae0078fcSDexuan Cui static 840ae0078fcSDexuan Cui int hvs_notify_send_post_enqueue(struct vsock_sock *vsk, ssize_t written, 841ae0078fcSDexuan Cui struct vsock_transport_send_notify_data *d) 842ae0078fcSDexuan Cui { 843ae0078fcSDexuan Cui return 0; 844ae0078fcSDexuan Cui } 845ae0078fcSDexuan Cui 846ae0078fcSDexuan Cui static void hvs_set_buffer_size(struct vsock_sock *vsk, u64 val) 847ae0078fcSDexuan Cui { 848ae0078fcSDexuan Cui /* Ignored. */ 849ae0078fcSDexuan Cui } 850ae0078fcSDexuan Cui 851ae0078fcSDexuan Cui static void hvs_set_min_buffer_size(struct vsock_sock *vsk, u64 val) 852ae0078fcSDexuan Cui { 853ae0078fcSDexuan Cui /* Ignored. */ 854ae0078fcSDexuan Cui } 855ae0078fcSDexuan Cui 856ae0078fcSDexuan Cui static void hvs_set_max_buffer_size(struct vsock_sock *vsk, u64 val) 857ae0078fcSDexuan Cui { 858ae0078fcSDexuan Cui /* Ignored. */ 859ae0078fcSDexuan Cui } 860ae0078fcSDexuan Cui 861ae0078fcSDexuan Cui static u64 hvs_get_buffer_size(struct vsock_sock *vsk) 862ae0078fcSDexuan Cui { 863ae0078fcSDexuan Cui return -ENOPROTOOPT; 864ae0078fcSDexuan Cui } 865ae0078fcSDexuan Cui 866ae0078fcSDexuan Cui static u64 hvs_get_min_buffer_size(struct vsock_sock *vsk) 867ae0078fcSDexuan Cui { 868ae0078fcSDexuan Cui return -ENOPROTOOPT; 869ae0078fcSDexuan Cui } 870ae0078fcSDexuan Cui 871ae0078fcSDexuan Cui static u64 hvs_get_max_buffer_size(struct vsock_sock *vsk) 872ae0078fcSDexuan Cui { 873ae0078fcSDexuan Cui return -ENOPROTOOPT; 874ae0078fcSDexuan Cui } 875ae0078fcSDexuan Cui 876ae0078fcSDexuan Cui static struct vsock_transport hvs_transport = { 877ae0078fcSDexuan Cui .get_local_cid = hvs_get_local_cid, 878ae0078fcSDexuan Cui 879ae0078fcSDexuan Cui .init = hvs_sock_init, 880ae0078fcSDexuan Cui .destruct = hvs_destruct, 881ae0078fcSDexuan Cui .release = hvs_release, 882ae0078fcSDexuan Cui .connect = hvs_connect, 883ae0078fcSDexuan Cui .shutdown = hvs_shutdown, 884ae0078fcSDexuan Cui 885ae0078fcSDexuan Cui .dgram_bind = hvs_dgram_bind, 886ae0078fcSDexuan Cui .dgram_dequeue = hvs_dgram_dequeue, 887ae0078fcSDexuan Cui .dgram_enqueue = hvs_dgram_enqueue, 888ae0078fcSDexuan Cui .dgram_allow = hvs_dgram_allow, 889ae0078fcSDexuan Cui 890ae0078fcSDexuan Cui .stream_dequeue = hvs_stream_dequeue, 891ae0078fcSDexuan Cui .stream_enqueue = hvs_stream_enqueue, 892ae0078fcSDexuan Cui .stream_has_data = hvs_stream_has_data, 893ae0078fcSDexuan Cui .stream_has_space = hvs_stream_has_space, 894ae0078fcSDexuan Cui .stream_rcvhiwat = hvs_stream_rcvhiwat, 895ae0078fcSDexuan Cui .stream_is_active = hvs_stream_is_active, 896ae0078fcSDexuan Cui .stream_allow = hvs_stream_allow, 897ae0078fcSDexuan Cui 898ae0078fcSDexuan Cui .notify_poll_in = hvs_notify_poll_in, 899ae0078fcSDexuan Cui .notify_poll_out = hvs_notify_poll_out, 900ae0078fcSDexuan Cui .notify_recv_init = hvs_notify_recv_init, 901ae0078fcSDexuan Cui .notify_recv_pre_block = hvs_notify_recv_pre_block, 902ae0078fcSDexuan Cui .notify_recv_pre_dequeue = hvs_notify_recv_pre_dequeue, 903ae0078fcSDexuan Cui .notify_recv_post_dequeue = hvs_notify_recv_post_dequeue, 904ae0078fcSDexuan Cui .notify_send_init = hvs_notify_send_init, 905ae0078fcSDexuan Cui .notify_send_pre_block = hvs_notify_send_pre_block, 906ae0078fcSDexuan Cui .notify_send_pre_enqueue = hvs_notify_send_pre_enqueue, 907ae0078fcSDexuan Cui .notify_send_post_enqueue = hvs_notify_send_post_enqueue, 908ae0078fcSDexuan Cui 909ae0078fcSDexuan Cui .set_buffer_size = hvs_set_buffer_size, 910ae0078fcSDexuan Cui .set_min_buffer_size = hvs_set_min_buffer_size, 911ae0078fcSDexuan Cui .set_max_buffer_size = hvs_set_max_buffer_size, 912ae0078fcSDexuan Cui .get_buffer_size = hvs_get_buffer_size, 913ae0078fcSDexuan Cui .get_min_buffer_size = hvs_get_min_buffer_size, 914ae0078fcSDexuan Cui .get_max_buffer_size = hvs_get_max_buffer_size, 915ae0078fcSDexuan Cui }; 916ae0078fcSDexuan Cui 917ae0078fcSDexuan Cui static int hvs_probe(struct hv_device *hdev, 918ae0078fcSDexuan Cui const struct hv_vmbus_device_id *dev_id) 919ae0078fcSDexuan Cui { 920ae0078fcSDexuan Cui struct vmbus_channel *chan = hdev->channel; 921ae0078fcSDexuan Cui 922ae0078fcSDexuan Cui hvs_open_connection(chan); 923ae0078fcSDexuan Cui 924ae0078fcSDexuan Cui /* Always return success to suppress the unnecessary error message 925ae0078fcSDexuan Cui * in vmbus_probe(): on error the host will rescind the device in 926ae0078fcSDexuan Cui * 30 seconds and we can do cleanup at that time in 927ae0078fcSDexuan Cui * vmbus_onoffer_rescind(). 928ae0078fcSDexuan Cui */ 929ae0078fcSDexuan Cui return 0; 930ae0078fcSDexuan Cui } 931ae0078fcSDexuan Cui 932ae0078fcSDexuan Cui static int hvs_remove(struct hv_device *hdev) 933ae0078fcSDexuan Cui { 934ae0078fcSDexuan Cui struct vmbus_channel *chan = hdev->channel; 935ae0078fcSDexuan Cui 936ae0078fcSDexuan Cui vmbus_close(chan); 937ae0078fcSDexuan Cui 938ae0078fcSDexuan Cui return 0; 939ae0078fcSDexuan Cui } 940ae0078fcSDexuan Cui 941ae0078fcSDexuan Cui /* This isn't really used. See vmbus_match() and vmbus_probe() */ 942ae0078fcSDexuan Cui static const struct hv_vmbus_device_id id_table[] = { 943ae0078fcSDexuan Cui {}, 944ae0078fcSDexuan Cui }; 945ae0078fcSDexuan Cui 946ae0078fcSDexuan Cui static struct hv_driver hvs_drv = { 947ae0078fcSDexuan Cui .name = "hv_sock", 948ae0078fcSDexuan Cui .hvsock = true, 949ae0078fcSDexuan Cui .id_table = id_table, 950ae0078fcSDexuan Cui .probe = hvs_probe, 951ae0078fcSDexuan Cui .remove = hvs_remove, 952ae0078fcSDexuan Cui }; 953ae0078fcSDexuan Cui 954ae0078fcSDexuan Cui static int __init hvs_init(void) 955ae0078fcSDexuan Cui { 956ae0078fcSDexuan Cui int ret; 957ae0078fcSDexuan Cui 958ae0078fcSDexuan Cui if (vmbus_proto_version < VERSION_WIN10) 959ae0078fcSDexuan Cui return -ENODEV; 960ae0078fcSDexuan Cui 961ae0078fcSDexuan Cui ret = vmbus_driver_register(&hvs_drv); 962ae0078fcSDexuan Cui if (ret != 0) 963ae0078fcSDexuan Cui return ret; 964ae0078fcSDexuan Cui 965ae0078fcSDexuan Cui ret = vsock_core_init(&hvs_transport); 966ae0078fcSDexuan Cui if (ret) { 967ae0078fcSDexuan Cui vmbus_driver_unregister(&hvs_drv); 968ae0078fcSDexuan Cui return ret; 969ae0078fcSDexuan Cui } 970ae0078fcSDexuan Cui 971ae0078fcSDexuan Cui return 0; 972ae0078fcSDexuan Cui } 973ae0078fcSDexuan Cui 974ae0078fcSDexuan Cui static void __exit hvs_exit(void) 975ae0078fcSDexuan Cui { 976ae0078fcSDexuan Cui vsock_core_exit(); 977ae0078fcSDexuan Cui vmbus_driver_unregister(&hvs_drv); 978ae0078fcSDexuan Cui } 979ae0078fcSDexuan Cui 980ae0078fcSDexuan Cui module_init(hvs_init); 981ae0078fcSDexuan Cui module_exit(hvs_exit); 982ae0078fcSDexuan Cui 983ae0078fcSDexuan Cui MODULE_DESCRIPTION("Hyper-V Sockets"); 984ae0078fcSDexuan Cui MODULE_VERSION("1.0.0"); 985ae0078fcSDexuan Cui MODULE_LICENSE("GPL"); 986ae0078fcSDexuan Cui MODULE_ALIAS_NETPROTO(PF_VSOCK); 987