include/linux/virtio_vsock.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_VIRTIO_VSOCK_H
   3 #define _LINUX_VIRTIO_VSOCK_H
   4
   5 #include <uapi/linux/virtio_vsock.h>
   6 #include <linux/socket.h>
   7 #include <net/sock.h>
   8 #include <net/af_vsock.h>
   9
  10 #define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE        (1024 * 4)
  11 #define VIRTIO_VSOCK_MAX_BUF_SIZE               0xFFFFFFFFUL
  12 #define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE           (1024 * 64)
  13
  14 enum {
  15         VSOCK_VQ_RX     = 0, /* for host to guest data */
  16         VSOCK_VQ_TX     = 1, /* for guest to host data */
  17         VSOCK_VQ_EVENT  = 2,
  18         VSOCK_VQ_MAX    = 3,
  19 };
  20
  21 /* Per-socket state (accessed via vsk->trans) */
  22 struct virtio_vsock_sock {
  23         struct vsock_sock *vsk;
  24
  25         spinlock_t tx_lock;
  26         spinlock_t rx_lock;
  27
  28         /* Protected by tx_lock */
  29         u32 tx_cnt;
  30         u32 peer_fwd_cnt;
  31         u32 peer_buf_alloc;
  32
  33         /* Protected by rx_lock */
  34         u32 fwd_cnt;
  35         u32 last_fwd_cnt;
  36         u32 rx_bytes;
  37         u32 buf_alloc;
  38         struct list_head rx_queue;
  39         u32 msg_count;
  40 };
  41
  42 struct virtio_vsock_pkt {
  43         struct virtio_vsock_hdr hdr;
  44         struct list_head list;
  45         /* socket refcnt not held, only use for cancellation */
  46         struct vsock_sock *vsk;
  47         void *buf;
  48         u32 buf_len;
  49         u32 len;
  50         u32 off;
  51         bool reply;
  52         bool tap_delivered;
  53 };
  54
  55 struct virtio_vsock_pkt_info {
  56         u32 remote_cid, remote_port;
  57         struct vsock_sock *vsk;
  58         struct msghdr *msg;
  59         u32 pkt_len;
  60         u16 type;
  61         u16 op;
  62         u32 flags;
  63         bool reply;
  64 };
  65
  66 struct virtio_transport {
  67         /* This must be the first field */
  68         struct vsock_transport transport;
  69
  70         /* Takes ownership of the packet */
  71         int (*send_pkt)(struct virtio_vsock_pkt *pkt);
  72 };
  73
  74 ssize_t
  75 virtio_transport_stream_dequeue(struct vsock_sock *vsk,
  76                                 struct msghdr *msg,
  77                                 size_t len,
  78                                 int type);
  79 int
  80 virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
  81                                struct msghdr *msg,
  82                                size_t len, int flags);
  83
  84 int
  85 virtio_transport_seqpacket_enqueue(struct vsock_sock *vsk,
  86                                    struct msghdr *msg,
  87                                    size_t len);
  88 ssize_t
  89 virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk,
  90                                    struct msghdr *msg,
  91                                    int flags);
  92 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
  93 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
  94 u32 virtio_transport_seqpacket_has_data(struct vsock_sock *vsk);
  95
  96 int virtio_transport_do_socket_init(struct vsock_sock *vsk,
  97                                  struct vsock_sock *psk);
  98 int
  99 virtio_transport_notify_poll_in(struct vsock_sock *vsk,
 100                                 size_t target,
 101                                 bool *data_ready_now);
 102 int
 103 virtio_transport_notify_poll_out(struct vsock_sock *vsk,
 104                                  size_t target,
 105                                  bool *space_available_now);
 106
 107 int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
 108         size_t target, struct vsock_transport_recv_notify_data *data);
 109 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
 110         size_t target, struct vsock_transport_recv_notify_data *data);
 111 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
 112         size_t target, struct vsock_transport_recv_notify_data *data);
 113 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
 114         size_t target, ssize_t copied, bool data_read,
 115         struct vsock_transport_recv_notify_data *data);
 116 int virtio_transport_notify_send_init(struct vsock_sock *vsk,
 117         struct vsock_transport_send_notify_data *data);
 118 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
 119         struct vsock_transport_send_notify_data *data);
 120 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
 121         struct vsock_transport_send_notify_data *data);
 122 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
 123         ssize_t written, struct vsock_transport_send_notify_data *data);
 124 void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val);
 125
 126 u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk);
 127 bool virtio_transport_stream_is_active(struct vsock_sock *vsk);
 128 bool virtio_transport_stream_allow(u32 cid, u32 port);
 129 int virtio_transport_dgram_bind(struct vsock_sock *vsk,
 130                                 struct sockaddr_vm *addr);
 131 bool virtio_transport_dgram_allow(u32 cid, u32 port);
 132
 133 int virtio_transport_connect(struct vsock_sock *vsk);
 134
 135 int virtio_transport_shutdown(struct vsock_sock *vsk, int mode);
 136
 137 void virtio_transport_release(struct vsock_sock *vsk);
 138
 139 ssize_t
 140 virtio_transport_stream_enqueue(struct vsock_sock *vsk,
 141                                 struct msghdr *msg,
 142                                 size_t len);
 143 int
 144 virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
 145                                struct sockaddr_vm *remote_addr,
 146                                struct msghdr *msg,
 147                                size_t len);
 148
 149 void virtio_transport_destruct(struct vsock_sock *vsk);
 150
 151 void virtio_transport_recv_pkt(struct virtio_transport *t,
 152                                struct virtio_vsock_pkt *pkt);
 153 void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt);
 154 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt);
 155 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted);
 156 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
 157 void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt);
 158
 159 #endif /* _LINUX_VIRTIO_VSOCK_H */