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 virtio_transport_max_vsock_pkt_buf_size 13 extern uint virtio_transport_max_vsock_pkt_buf_size; 14 15 enum { 16 VSOCK_VQ_RX = 0, /* for host to guest data */ 17 VSOCK_VQ_TX = 1, /* for guest to host data */ 18 VSOCK_VQ_EVENT = 2, 19 VSOCK_VQ_MAX = 3, 20 }; 21 22 /* Per-socket state (accessed via vsk->trans) */ 23 struct virtio_vsock_sock { 24 struct vsock_sock *vsk; 25 26 spinlock_t tx_lock; 27 spinlock_t rx_lock; 28 29 /* Protected by tx_lock */ 30 u32 tx_cnt; 31 u32 peer_fwd_cnt; 32 u32 peer_buf_alloc; 33 34 /* Protected by rx_lock */ 35 u32 fwd_cnt; 36 u32 last_fwd_cnt; 37 u32 rx_bytes; 38 u32 buf_alloc; 39 struct list_head rx_queue; 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 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); 85 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); 86 87 int virtio_transport_do_socket_init(struct vsock_sock *vsk, 88 struct vsock_sock *psk); 89 int 90 virtio_transport_notify_poll_in(struct vsock_sock *vsk, 91 size_t target, 92 bool *data_ready_now); 93 int 94 virtio_transport_notify_poll_out(struct vsock_sock *vsk, 95 size_t target, 96 bool *space_available_now); 97 98 int virtio_transport_notify_recv_init(struct vsock_sock *vsk, 99 size_t target, struct vsock_transport_recv_notify_data *data); 100 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, 101 size_t target, struct vsock_transport_recv_notify_data *data); 102 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, 103 size_t target, struct vsock_transport_recv_notify_data *data); 104 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, 105 size_t target, ssize_t copied, bool data_read, 106 struct vsock_transport_recv_notify_data *data); 107 int virtio_transport_notify_send_init(struct vsock_sock *vsk, 108 struct vsock_transport_send_notify_data *data); 109 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, 110 struct vsock_transport_send_notify_data *data); 111 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, 112 struct vsock_transport_send_notify_data *data); 113 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, 114 ssize_t written, struct vsock_transport_send_notify_data *data); 115 void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val); 116 117 u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk); 118 bool virtio_transport_stream_is_active(struct vsock_sock *vsk); 119 bool virtio_transport_stream_allow(u32 cid, u32 port); 120 int virtio_transport_dgram_bind(struct vsock_sock *vsk, 121 struct sockaddr_vm *addr); 122 bool virtio_transport_dgram_allow(u32 cid, u32 port); 123 124 int virtio_transport_connect(struct vsock_sock *vsk); 125 126 int virtio_transport_shutdown(struct vsock_sock *vsk, int mode); 127 128 void virtio_transport_release(struct vsock_sock *vsk); 129 130 ssize_t 131 virtio_transport_stream_enqueue(struct vsock_sock *vsk, 132 struct msghdr *msg, 133 size_t len); 134 int 135 virtio_transport_dgram_enqueue(struct vsock_sock *vsk, 136 struct sockaddr_vm *remote_addr, 137 struct msghdr *msg, 138 size_t len); 139 140 void virtio_transport_destruct(struct vsock_sock *vsk); 141 142 void virtio_transport_recv_pkt(struct virtio_transport *t, 143 struct virtio_vsock_pkt *pkt); 144 void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt); 145 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt); 146 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); 147 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); 148 void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt); 149 150 #endif /* _LINUX_VIRTIO_VSOCK_H */ 151