233 lines
6.1 KiB
C
233 lines
6.1 KiB
C
/** @file
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@brief Generic connection handling.
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This is not to be included by the application.
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*/
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/*
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __CONNECTION_H
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#define __CONNECTION_H
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#include <zephyr/types.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/net/net_context.h>
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#include <zephyr/net/net_core.h>
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#include <zephyr/net/net_ip.h>
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#include <zephyr/net/net_pkt.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct net_conn;
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struct net_conn_handle;
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/**
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* @brief Function that is called by connection subsystem when a
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* net packet is received which matches local and remote address
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* (and port in case of TCP/UDP packets).
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*
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* The arguments ip_hdr and proto_hdr are NULL in case of non-IP
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* protocols.
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*/
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typedef enum net_verdict (*net_conn_cb_t)(struct net_conn *conn,
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struct net_pkt *pkt,
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union net_ip_header *ip_hdr,
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union net_proto_header *proto_hdr,
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void *user_data);
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/**
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* @brief Information about a connection in the system.
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*
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* Stores the connection information.
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*
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*/
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struct net_conn {
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/** Internal slist node */
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sys_snode_t node;
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/** Remote socket address */
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struct sockaddr remote_addr;
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/** Local socket address */
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struct sockaddr local_addr;
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/** Callback to be called when matching net packet is received */
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net_conn_cb_t cb;
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/** A pointer to the net_context corresponding to the connection.
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* Can be NULL if no net_context is associated.
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*/
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struct net_context *context;
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/** Possible user to pass to the callback */
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void *user_data;
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/** Connection protocol */
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uint16_t proto;
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/** Protocol family */
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uint8_t family;
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/** Flags for the connection */
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uint8_t flags;
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/** Is v4-mapping-to-v6 enabled for this connection */
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uint8_t v6only : 1;
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};
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/**
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* @brief Register a callback to be called when a net packet
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* is received corresponding to received packet.
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*
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* @param proto Protocol for the connection (depends on the protocol
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* family, e.g. UDP/TCP in the case of AF_INET/AF_INET6)
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* @param family Protocol family (AF_*)
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* @param remote_addr Remote address of the connection end point.
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* @param local_addr Local address of the connection end point.
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* @param remote_port Remote port of the connection end point.
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* @param local_port Local port of the connection end point.
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* @param cb Callback to be called when a matching net pkt is received
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* @param context net_context structure related to the connection.
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* @param user_data User data supplied by caller.
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* @param handle Connection handle that can be used when unregistering
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*
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* @return Return 0 if the registration succeed, <0 otherwise.
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*/
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#if defined(CONFIG_NET_NATIVE)
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int net_conn_register(uint16_t proto, uint8_t family,
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const struct sockaddr *remote_addr,
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const struct sockaddr *local_addr,
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uint16_t remote_port,
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uint16_t local_port,
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struct net_context *context,
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net_conn_cb_t cb,
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void *user_data,
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struct net_conn_handle **handle);
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#else
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static inline int net_conn_register(uint16_t proto, uint8_t family,
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const struct sockaddr *remote_addr,
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const struct sockaddr *local_addr,
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uint16_t remote_port,
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uint16_t local_port,
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struct net_context *context,
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net_conn_cb_t cb,
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void *user_data,
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struct net_conn_handle **handle)
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{
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ARG_UNUSED(proto);
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ARG_UNUSED(family);
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ARG_UNUSED(remote_addr);
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ARG_UNUSED(local_addr);
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ARG_UNUSED(remote_port);
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ARG_UNUSED(local_port);
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ARG_UNUSED(cb);
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ARG_UNUSED(context);
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ARG_UNUSED(user_data);
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ARG_UNUSED(handle);
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return -ENOTSUP;
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}
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#endif
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/**
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* @brief Unregister connection handler.
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*
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* @param handle Handle from registering.
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*
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* @return Return 0 if the unregistration succeed, <0 otherwise.
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*/
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#if defined(CONFIG_NET_NATIVE)
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int net_conn_unregister(struct net_conn_handle *handle);
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#else
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static inline int net_conn_unregister(struct net_conn_handle *handle)
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{
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ARG_UNUSED(handle);
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return -ENOTSUP;
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}
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#endif
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/**
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* @brief Update the callback, user data, remote address, and port
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* for a registered connection handle.
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*
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* @param handle A handle registered with net_conn_register()
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* @param cb Callback to be called
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* @param user_data User data supplied by caller.
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* @param remote_addr Remote address
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* @param remote_port Remote port
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*
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* @return Return 0 if the the change succeed, <0 otherwise.
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*/
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int net_conn_update(struct net_conn_handle *handle,
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net_conn_cb_t cb,
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void *user_data,
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const struct sockaddr *remote_addr,
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uint16_t remote_port);
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/**
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* @brief Called by net_core.c when a network packet is received.
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*
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* @param pkt Network packet holding received data
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* @param proto Protocol for the connection
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*
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* @return NET_OK if the packet was consumed, NET_DROP if
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* the packet parsing failed and the caller should handle
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* the received packet. If corresponding IP protocol support is
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* disabled, the function will always return NET_DROP.
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*/
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#if defined(CONFIG_NET_IP) || defined(CONFIG_NET_CONNECTION_SOCKETS)
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enum net_verdict net_conn_input(struct net_pkt *pkt,
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union net_ip_header *ip_hdr,
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uint8_t proto,
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union net_proto_header *proto_hdr);
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#else
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static inline enum net_verdict net_conn_input(struct net_pkt *pkt,
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union net_ip_header *ip_hdr,
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uint8_t proto,
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union net_proto_header *proto_hdr)
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{
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return NET_DROP;
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}
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#endif /* CONFIG_NET_IP || CONFIG_NET_CONNECTION_SOCKETS */
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/**
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* @typedef net_conn_foreach_cb_t
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* @brief Callback used while iterating over network connection
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* handlers.
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*
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* @param conn A valid pointer on current network connection handler.
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* @param user_data A valid pointer on some user data or NULL
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*/
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typedef void (*net_conn_foreach_cb_t)(struct net_conn *conn, void *user_data);
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/**
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* @brief Go through all the network connection handlers and call callback
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* for each network connection handler.
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*
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* @param cb User supplied callback function to call.
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* @param user_data User specified data.
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*/
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void net_conn_foreach(net_conn_foreach_cb_t cb, void *user_data);
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#if defined(CONFIG_NET_NATIVE)
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void net_conn_init(void);
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#else
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#define net_conn_init(...)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* __CONNECTION_H */
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