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 bool tap_delivered; 52 }; 53 54 struct virtio_vsock_pkt_info { 55 u32 remote_cid, remote_port; 56 struct vsock_sock *vsk; 57 struct msghdr *msg; 58 u32 pkt_len; 59 u16 type; 60 u16 op; 61 u32 flags; 62 bool reply; 63 }; 64 65 struct virtio_transport { 66 /* This must be the first field */ 67 struct vsock_transport transport; 68 69 /* Takes ownership of the packet */ 70 int (*send_pkt)(struct virtio_vsock_pkt *pkt); 71 }; 72 73 ssize_t 74 virtio_transport_stream_dequeue(struct vsock_sock *vsk, 75 struct msghdr *msg, 76 size_t len, 77 int type); 78 int 79 virtio_transport_dgram_dequeue(struct vsock_sock *vsk, 80 struct msghdr *msg, 81 size_t len, int flags); 82 83 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); 84 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); 85 86 int virtio_transport_do_socket_init(struct vsock_sock *vsk, 87 struct vsock_sock *psk); 88 int 89 virtio_transport_notify_poll_in(struct vsock_sock *vsk, 90 size_t target, 91 bool *data_ready_now); 92 int 93 virtio_transport_notify_poll_out(struct vsock_sock *vsk, 94 size_t target, 95 bool *space_available_now); 96 97 int virtio_transport_notify_recv_init(struct vsock_sock *vsk, 98 size_t target, struct vsock_transport_recv_notify_data *data); 99 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, 100 size_t target, struct vsock_transport_recv_notify_data *data); 101 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, 102 size_t target, struct vsock_transport_recv_notify_data *data); 103 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, 104 size_t target, ssize_t copied, bool data_read, 105 struct vsock_transport_recv_notify_data *data); 106 int virtio_transport_notify_send_init(struct vsock_sock *vsk, 107 struct vsock_transport_send_notify_data *data); 108 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, 109 struct vsock_transport_send_notify_data *data); 110 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, 111 struct vsock_transport_send_notify_data *data); 112 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, 113 ssize_t written, struct vsock_transport_send_notify_data *data); 114 void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val); 115 116 u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk); 117 bool virtio_transport_stream_is_active(struct vsock_sock *vsk); 118 bool virtio_transport_stream_allow(u32 cid, u32 port); 119 int virtio_transport_dgram_bind(struct vsock_sock *vsk, 120 struct sockaddr_vm *addr); 121 bool virtio_transport_dgram_allow(u32 cid, u32 port); 122 123 int virtio_transport_connect(struct vsock_sock *vsk); 124 125 int virtio_transport_shutdown(struct vsock_sock *vsk, int mode); 126 127 void virtio_transport_release(struct vsock_sock *vsk); 128 129 ssize_t 130 virtio_transport_stream_enqueue(struct vsock_sock *vsk, 131 struct msghdr *msg, 132 size_t len); 133 int 134 virtio_transport_dgram_enqueue(struct vsock_sock *vsk, 135 struct sockaddr_vm *remote_addr, 136 struct msghdr *msg, 137 size_t len); 138 139 void virtio_transport_destruct(struct vsock_sock *vsk); 140 141 void virtio_transport_recv_pkt(struct virtio_transport *t, 142 struct virtio_vsock_pkt *pkt); 143 void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt); 144 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt); 145 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); 146 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); 147 void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt); 148 149 #endif /* _LINUX_VIRTIO_VSOCK_H */ 150