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 u32 msg_count; 41 }; 42 43 struct virtio_vsock_pkt { 44 struct virtio_vsock_hdr hdr; 45 struct list_head list; 46 /* socket refcnt not held, only use for cancellation */ 47 struct vsock_sock *vsk; 48 void *buf; 49 u32 buf_len; 50 u32 len; 51 u32 off; 52 bool reply; 53 bool tap_delivered; 54 }; 55 56 struct virtio_vsock_pkt_info { 57 u32 remote_cid, remote_port; 58 struct vsock_sock *vsk; 59 struct msghdr *msg; 60 u32 pkt_len; 61 u16 type; 62 u16 op; 63 u32 flags; 64 bool reply; 65 }; 66 67 struct virtio_transport { 68 /* This must be the first field */ 69 struct vsock_transport transport; 70 71 /* Takes ownership of the packet */ 72 int (*send_pkt)(struct virtio_vsock_pkt *pkt); 73 }; 74 75 ssize_t 76 virtio_transport_stream_dequeue(struct vsock_sock *vsk, 77 struct msghdr *msg, 78 size_t len, 79 int type); 80 int 81 virtio_transport_dgram_dequeue(struct vsock_sock *vsk, 82 struct msghdr *msg, 83 size_t len, int flags); 84 85 int 86 virtio_transport_seqpacket_enqueue(struct vsock_sock *vsk, 87 struct msghdr *msg, 88 size_t len); 89 ssize_t 90 virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk, 91 struct msghdr *msg, 92 int flags); 93 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); 94 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); 95 u32 virtio_transport_seqpacket_has_data(struct vsock_sock *vsk); 96 97 int virtio_transport_do_socket_init(struct vsock_sock *vsk, 98 struct vsock_sock *psk); 99 int 100 virtio_transport_notify_poll_in(struct vsock_sock *vsk, 101 size_t target, 102 bool *data_ready_now); 103 int 104 virtio_transport_notify_poll_out(struct vsock_sock *vsk, 105 size_t target, 106 bool *space_available_now); 107 108 int virtio_transport_notify_recv_init(struct vsock_sock *vsk, 109 size_t target, struct vsock_transport_recv_notify_data *data); 110 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, 111 size_t target, struct vsock_transport_recv_notify_data *data); 112 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, 113 size_t target, struct vsock_transport_recv_notify_data *data); 114 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, 115 size_t target, ssize_t copied, bool data_read, 116 struct vsock_transport_recv_notify_data *data); 117 int virtio_transport_notify_send_init(struct vsock_sock *vsk, 118 struct vsock_transport_send_notify_data *data); 119 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, 120 struct vsock_transport_send_notify_data *data); 121 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, 122 struct vsock_transport_send_notify_data *data); 123 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, 124 ssize_t written, struct vsock_transport_send_notify_data *data); 125 void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val); 126 127 u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk); 128 bool virtio_transport_stream_is_active(struct vsock_sock *vsk); 129 bool virtio_transport_stream_allow(u32 cid, u32 port); 130 int virtio_transport_dgram_bind(struct vsock_sock *vsk, 131 struct sockaddr_vm *addr); 132 bool virtio_transport_dgram_allow(u32 cid, u32 port); 133 134 int virtio_transport_connect(struct vsock_sock *vsk); 135 136 int virtio_transport_shutdown(struct vsock_sock *vsk, int mode); 137 138 void virtio_transport_release(struct vsock_sock *vsk); 139 140 ssize_t 141 virtio_transport_stream_enqueue(struct vsock_sock *vsk, 142 struct msghdr *msg, 143 size_t len); 144 int 145 virtio_transport_dgram_enqueue(struct vsock_sock *vsk, 146 struct sockaddr_vm *remote_addr, 147 struct msghdr *msg, 148 size_t len); 149 150 void virtio_transport_destruct(struct vsock_sock *vsk); 151 152 void virtio_transport_recv_pkt(struct virtio_transport *t, 153 struct virtio_vsock_pkt *pkt); 154 void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt); 155 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt); 156 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); 157 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); 158 void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt); 159 160 #endif /* _LINUX_VIRTIO_VSOCK_H */ 161