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_MIN_BUF_SIZE 128 11 #define VIRTIO_VSOCK_DEFAULT_BUF_SIZE (1024 * 256) 12 #define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE (1024 * 256) 13 #define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4) 14 #define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL 15 #define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64) 16 17 enum { 18 VSOCK_VQ_RX = 0, /* for host to guest data */ 19 VSOCK_VQ_TX = 1, /* for guest to host data */ 20 VSOCK_VQ_EVENT = 2, 21 VSOCK_VQ_MAX = 3, 22 }; 23 24 /* Per-socket state (accessed via vsk->trans) */ 25 struct virtio_vsock_sock { 26 struct vsock_sock *vsk; 27 28 /* Protected by lock_sock(sk_vsock(trans->vsk)) */ 29 u32 buf_size; 30 u32 buf_size_min; 31 u32 buf_size_max; 32 33 spinlock_t tx_lock; 34 spinlock_t rx_lock; 35 36 /* Protected by tx_lock */ 37 u32 tx_cnt; 38 u32 buf_alloc; 39 u32 peer_fwd_cnt; 40 u32 peer_buf_alloc; 41 42 /* Protected by rx_lock */ 43 u32 fwd_cnt; 44 u32 rx_bytes; 45 struct list_head rx_queue; 46 }; 47 48 struct virtio_vsock_pkt { 49 struct virtio_vsock_hdr hdr; 50 struct work_struct work; 51 struct list_head list; 52 /* socket refcnt not held, only use for cancellation */ 53 struct vsock_sock *vsk; 54 void *buf; 55 u32 len; 56 u32 off; 57 bool reply; 58 }; 59 60 struct virtio_vsock_pkt_info { 61 u32 remote_cid, remote_port; 62 struct vsock_sock *vsk; 63 struct msghdr *msg; 64 u32 pkt_len; 65 u16 type; 66 u16 op; 67 u32 flags; 68 bool reply; 69 }; 70 71 struct virtio_transport { 72 /* This must be the first field */ 73 struct vsock_transport transport; 74 75 /* Takes ownership of the packet */ 76 int (*send_pkt)(struct virtio_vsock_pkt *pkt); 77 }; 78 79 ssize_t 80 virtio_transport_stream_dequeue(struct vsock_sock *vsk, 81 struct msghdr *msg, 82 size_t len, 83 int type); 84 int 85 virtio_transport_dgram_dequeue(struct vsock_sock *vsk, 86 struct msghdr *msg, 87 size_t len, int flags); 88 89 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); 90 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); 91 92 int virtio_transport_do_socket_init(struct vsock_sock *vsk, 93 struct vsock_sock *psk); 94 u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk); 95 u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk); 96 u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk); 97 void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val); 98 void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val); 99 void virtio_transport_set_max_buffer_size(struct vsock_sock *vs, u64 val); 100 int 101 virtio_transport_notify_poll_in(struct vsock_sock *vsk, 102 size_t target, 103 bool *data_ready_now); 104 int 105 virtio_transport_notify_poll_out(struct vsock_sock *vsk, 106 size_t target, 107 bool *space_available_now); 108 109 int virtio_transport_notify_recv_init(struct vsock_sock *vsk, 110 size_t target, struct vsock_transport_recv_notify_data *data); 111 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, 112 size_t target, struct vsock_transport_recv_notify_data *data); 113 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, 114 size_t target, struct vsock_transport_recv_notify_data *data); 115 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, 116 size_t target, ssize_t copied, bool data_read, 117 struct vsock_transport_recv_notify_data *data); 118 int virtio_transport_notify_send_init(struct vsock_sock *vsk, 119 struct vsock_transport_send_notify_data *data); 120 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, 121 struct vsock_transport_send_notify_data *data); 122 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, 123 struct vsock_transport_send_notify_data *data); 124 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, 125 ssize_t written, struct vsock_transport_send_notify_data *data); 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