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 }; 40 41 struct virtio_vsock_pkt { 42 struct virtio_vsock_hdr hdr; 43 struct list_head list; 44 /* socket refcnt not held, only use for cancellation */ 45 struct vsock_sock *vsk; 46 void *buf; 47 u32 buf_len; 48 u32 len; 49 u32 off; 50 bool reply; 51 }; 52 53 struct virtio_vsock_pkt_info { 54 u32 remote_cid, remote_port; 55 struct vsock_sock *vsk; 56 struct msghdr *msg; 57 u32 pkt_len; 58 u16 type; 59 u16 op; 60 u32 flags; 61 bool reply; 62 }; 63 64 struct virtio_transport { 65 /* This must be the first field */ 66 struct vsock_transport transport; 67 68 /* Takes ownership of the packet */ 69 int (*send_pkt)(struct virtio_vsock_pkt *pkt); 70 }; 71 72 ssize_t 73 virtio_transport_stream_dequeue(struct vsock_sock *vsk, 74 struct msghdr *msg, 75 size_t len, 76 int type); 77 int 78 virtio_transport_dgram_dequeue(struct vsock_sock *vsk, 79 struct msghdr *msg, 80 size_t len, int flags); 81 82 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); 83 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); 84 85 int virtio_transport_do_socket_init(struct vsock_sock *vsk, 86 struct vsock_sock *psk); 87 int 88 virtio_transport_notify_poll_in(struct vsock_sock *vsk, 89 size_t target, 90 bool *data_ready_now); 91 int 92 virtio_transport_notify_poll_out(struct vsock_sock *vsk, 93 size_t target, 94 bool *space_available_now); 95 96 int virtio_transport_notify_recv_init(struct vsock_sock *vsk, 97 size_t target, struct vsock_transport_recv_notify_data *data); 98 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, 99 size_t target, struct vsock_transport_recv_notify_data *data); 100 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, 101 size_t target, struct vsock_transport_recv_notify_data *data); 102 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, 103 size_t target, ssize_t copied, bool data_read, 104 struct vsock_transport_recv_notify_data *data); 105 int virtio_transport_notify_send_init(struct vsock_sock *vsk, 106 struct vsock_transport_send_notify_data *data); 107 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, 108 struct vsock_transport_send_notify_data *data); 109 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, 110 struct vsock_transport_send_notify_data *data); 111 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, 112 ssize_t written, struct vsock_transport_send_notify_data *data); 113 void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val); 114 115 u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk); 116 bool virtio_transport_stream_is_active(struct vsock_sock *vsk); 117 bool virtio_transport_stream_allow(u32 cid, u32 port); 118 int virtio_transport_dgram_bind(struct vsock_sock *vsk, 119 struct sockaddr_vm *addr); 120 bool virtio_transport_dgram_allow(u32 cid, u32 port); 121 122 int virtio_transport_connect(struct vsock_sock *vsk); 123 124 int virtio_transport_shutdown(struct vsock_sock *vsk, int mode); 125 126 void virtio_transport_release(struct vsock_sock *vsk); 127 128 ssize_t 129 virtio_transport_stream_enqueue(struct vsock_sock *vsk, 130 struct msghdr *msg, 131 size_t len); 132 int 133 virtio_transport_dgram_enqueue(struct vsock_sock *vsk, 134 struct sockaddr_vm *remote_addr, 135 struct msghdr *msg, 136 size_t len); 137 138 void virtio_transport_destruct(struct vsock_sock *vsk); 139 140 void virtio_transport_recv_pkt(struct virtio_transport *t, 141 struct virtio_vsock_pkt *pkt); 142 void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt); 143 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt); 144 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); 145 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); 146 void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt); 147 148 #endif /* _LINUX_VIRTIO_VSOCK_H */ 149