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Diffstat (limited to 'include/net/af_vsock.h')
| -rw-r--r-- | include/net/af_vsock.h | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h new file mode 100644 index 000000000..4d8589244 --- /dev/null +++ b/include/net/af_vsock.h @@ -0,0 +1,218 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * VMware vSockets Driver + * + * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. + */ + +#ifndef __AF_VSOCK_H__ +#define __AF_VSOCK_H__ + +#include <linux/kernel.h> +#include <linux/workqueue.h> +#include <uapi/linux/vm_sockets.h> + +#include "vsock_addr.h" + +#define LAST_RESERVED_PORT 1023 + +#define VSOCK_HASH_SIZE 251 +extern struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; +extern struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; +extern spinlock_t vsock_table_lock; + +#define vsock_sk(__sk) ((struct vsock_sock *)__sk) +#define sk_vsock(__vsk) (&(__vsk)->sk) + +struct vsock_sock { + /* sk must be the first member. */ + struct sock sk; + const struct vsock_transport *transport; + struct sockaddr_vm local_addr; + struct sockaddr_vm remote_addr; + /* Links for the global tables of bound and connected sockets. */ + struct list_head bound_table; + struct list_head connected_table; + /* Accessed without the socket lock held. This means it can never be + * modified outsided of socket create or destruct. + */ + bool trusted; + bool cached_peer_allow_dgram; /* Dgram communication allowed to + * cached peer? + */ + u32 cached_peer; /* Context ID of last dgram destination check. */ + const struct cred *owner; + /* Rest are SOCK_STREAM only. */ + long connect_timeout; + /* Listening socket that this came from. */ + struct sock *listener; + /* Used for pending list and accept queue during connection handshake. + * The listening socket is the head for both lists. Sockets created + * for connection requests are placed in the pending list until they + * are connected, at which point they are put in the accept queue list + * so they can be accepted in accept(). If accept() cannot accept the + * connection, it is marked as rejected so the cleanup function knows + * to clean up the socket. + */ + struct list_head pending_links; + struct list_head accept_queue; + bool rejected; + struct delayed_work connect_work; + struct delayed_work pending_work; + struct delayed_work close_work; + bool close_work_scheduled; + u32 peer_shutdown; + bool sent_request; + bool ignore_connecting_rst; + + /* Protected by lock_sock(sk) */ + u64 buffer_size; + u64 buffer_min_size; + u64 buffer_max_size; + + /* Private to transport. */ + void *trans; +}; + +s64 vsock_stream_has_data(struct vsock_sock *vsk); +s64 vsock_stream_has_space(struct vsock_sock *vsk); +struct sock *vsock_create_connected(struct sock *parent); + +/**** TRANSPORT ****/ + +struct vsock_transport_recv_notify_data { + u64 data1; /* Transport-defined. */ + u64 data2; /* Transport-defined. */ + bool notify_on_block; +}; + +struct vsock_transport_send_notify_data { + u64 data1; /* Transport-defined. */ + u64 data2; /* Transport-defined. */ +}; + +/* Transport features flags */ +/* Transport provides host->guest communication */ +#define VSOCK_TRANSPORT_F_H2G 0x00000001 +/* Transport provides guest->host communication */ +#define VSOCK_TRANSPORT_F_G2H 0x00000002 +/* Transport provides DGRAM communication */ +#define VSOCK_TRANSPORT_F_DGRAM 0x00000004 +/* Transport provides local (loopback) communication */ +#define VSOCK_TRANSPORT_F_LOCAL 0x00000008 + +struct vsock_transport { + struct module *module; + + /* Initialize/tear-down socket. */ + int (*init)(struct vsock_sock *, struct vsock_sock *); + void (*destruct)(struct vsock_sock *); + void (*release)(struct vsock_sock *); + + /* Cancel all pending packets sent on vsock. */ + int (*cancel_pkt)(struct vsock_sock *vsk); + + /* Connections. */ + int (*connect)(struct vsock_sock *); + + /* DGRAM. */ + int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *); + int (*dgram_dequeue)(struct vsock_sock *vsk, struct msghdr *msg, + size_t len, int flags); + int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *, + struct msghdr *, size_t len); + bool (*dgram_allow)(u32 cid, u32 port); + + /* STREAM. */ + /* TODO: stream_bind() */ + ssize_t (*stream_dequeue)(struct vsock_sock *, struct msghdr *, + size_t len, int flags); + ssize_t (*stream_enqueue)(struct vsock_sock *, struct msghdr *, + size_t len); + s64 (*stream_has_data)(struct vsock_sock *); + s64 (*stream_has_space)(struct vsock_sock *); + u64 (*stream_rcvhiwat)(struct vsock_sock *); + bool (*stream_is_active)(struct vsock_sock *); + bool (*stream_allow)(u32 cid, u32 port); + + /* Notification. */ + int (*notify_poll_in)(struct vsock_sock *, size_t, bool *); + int (*notify_poll_out)(struct vsock_sock *, size_t, bool *); + int (*notify_recv_init)(struct vsock_sock *, size_t, + struct vsock_transport_recv_notify_data *); + int (*notify_recv_pre_block)(struct vsock_sock *, size_t, + struct vsock_transport_recv_notify_data *); + int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t, + struct vsock_transport_recv_notify_data *); + int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t, + ssize_t, bool, struct vsock_transport_recv_notify_data *); + int (*notify_send_init)(struct vsock_sock *, + struct vsock_transport_send_notify_data *); + int (*notify_send_pre_block)(struct vsock_sock *, + struct vsock_transport_send_notify_data *); + int (*notify_send_pre_enqueue)(struct vsock_sock *, + struct vsock_transport_send_notify_data *); + int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t, + struct vsock_transport_send_notify_data *); + /* sk_lock held by the caller */ + void (*notify_buffer_size)(struct vsock_sock *, u64 *); + + /* Shutdown. */ + int (*shutdown)(struct vsock_sock *, int); + + /* Addressing. */ + u32 (*get_local_cid)(void); +}; + +/**** CORE ****/ + +int vsock_core_register(const struct vsock_transport *t, int features); +void vsock_core_unregister(const struct vsock_transport *t); + +/* The transport may downcast this to access transport-specific functions */ +const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk); + +/**** UTILS ****/ + +/* vsock_table_lock must be held */ +static inline bool __vsock_in_bound_table(struct vsock_sock *vsk) +{ + return !list_empty(&vsk->bound_table); +} + +/* vsock_table_lock must be held */ +static inline bool __vsock_in_connected_table(struct vsock_sock *vsk) +{ + return !list_empty(&vsk->connected_table); +} + +void vsock_release_pending(struct sock *pending); +void vsock_add_pending(struct sock *listener, struct sock *pending); +void vsock_remove_pending(struct sock *listener, struct sock *pending); +void vsock_enqueue_accept(struct sock *listener, struct sock *connected); +void vsock_insert_connected(struct vsock_sock *vsk); +void vsock_remove_bound(struct vsock_sock *vsk); +void vsock_remove_connected(struct vsock_sock *vsk); +struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr); +struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, + struct sockaddr_vm *dst); +void vsock_remove_sock(struct vsock_sock *vsk); +void vsock_for_each_connected_socket(struct vsock_transport *transport, + void (*fn)(struct sock *sk)); +int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk); +bool vsock_find_cid(unsigned int cid); + +/**** TAP ****/ + +struct vsock_tap { + struct net_device *dev; + struct module *module; + struct list_head list; +}; + +int vsock_init_tap(void); +int vsock_add_tap(struct vsock_tap *vt); +int vsock_remove_tap(struct vsock_tap *vt); +void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque); + +#endif /* __AF_VSOCK_H__ */ |