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/*
* Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup net_uhcp UHCP
* @ingroup net
* @brief Provides UHCP (micro host configuration protocol)
* @{
*
* @file
* @brief UHCP header
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
*/
#ifndef UHCP_H
#define UHCP_H
#include <stdint.h>
#include <stddef.h>
#include <arpa/inet.h>
#ifdef __cplusplus
extern "C" {
#endif
/** @brief UHCP magic number */
#define UHCP_MAGIC (0x55484350) /* "UHCP" in hex */
/** @brief UHCP version of this header */
#define UHCP_VER (0)
/** @brief UHCP port number */
#define UHCP_PORT (12345U)
/** @brief UHCP port number (as string for e.g., getaddrinfo() service arg */
#define UHCP_PORT_STR "12345"
/** @brief Enum containing possible UHCP packet types */
typedef enum {
UHCP_REQ, /**< packet is a request packet */
UHCP_PUSH /**< packet is a push / answer packet */
} uhcp_type_t;
/**
* @brief UHCP packet header struct
*/
typedef struct __attribute__((packed)) {
uint32_t uhcp_magic; /**< always contains UHCP in hex */
uint8_t ver_type; /**< four bits version number, four bits
packet type (see uchp_type_t) */
} uhcp_hdr_t;
/**
* @brief struct for request packets
*
* @extends uhcp_hdr_t
*/
typedef struct __attribute__((packed)) {
uhcp_hdr_t hdr; /**< member holding parent type */
uint8_t prefix_len; /**< contains the requested prefix length */
} uhcp_req_t;
/**
* @brief struct for push packets
*
* @extends uhcp_hdr_t
*/
typedef struct __attribute__((packed)) {
uhcp_hdr_t hdr; /**< member holding parent type */
uint8_t prefix_len; /**< contains the prefix length of assigned
prefix */
uint8_t prefix[]; /**< contains the assigned prefix */
} uhcp_push_t;
/** @brief typedef for interface handle */
typedef unsigned uhcp_iface_t;
/**
* @brief handle incoming UDP packet
*
* This function should be called by UHCP server/client network code for every
* incoming UDP packet destined to UCHP_PORT.
*
* @param[in] buf buffer containing UDP packet
* @param[in] len length of @c buf
* @param[in] src ptr to IPv6 source address
* @param[in] port source port of packet
* @param[in] iface interface number of incoming packet
*/
void uhcp_handle_udp(uint8_t *buf, size_t len, uint8_t *src, uint16_t port, uhcp_iface_t iface);
/**
* @brief handle incoming UHCP request packet
*
* This function will be called by uhcp_handle_udp() for incoming request
* packet.
*
* @internal
*
* @param[in] req ptr to UHCP request header
* @param[in] src ptr to IPv6 source address
* @param[in] port source port of packet
* @param[in] iface number of interface the packet came in
*/
void uhcp_handle_req(uhcp_req_t *req, uint8_t *src, uint16_t port, uhcp_iface_t iface);
/**
* @brief handle incoming UHCP push packet
*
* This function will be called by uhcp_handle_udp() for incoming push
* packet.
*
* @internal
*
* @param[in] req ptr to UHCP push header
* @param[in] src ptr to IPv6 source address
* @param[in] port source port of packet
* @param[in] iface number of interface the packet came in
*/
void uhcp_handle_push(uhcp_push_t *req, uint8_t *src, uint16_t port, uhcp_iface_t iface);
/**
* @brief handle incoming prefix (as parsed from push packet)
*
* Supposed to be implemented by UHCP client implementations.
*
* The function might be called with an already configured prefix. In that
* case, the lifetime *MUST* be updated.
*
* If the function is called with a different prefix than before, the old
* prefix *MUST* be considered obsolete.
*
* @param[in] prefix ptr to assigned prefix
* @param[in] prefix_len length of assigned prefix
* @param[in] lifetime lifetime of prefix
* @param[in] src ptr to IPv6 source address
* @param[in] iface number of interface the packet came in
*/
void uhcp_handle_prefix(uint8_t *prefix, uint8_t prefix_len, uint16_t lifetime, uint8_t *src, uhcp_iface_t iface);
/**
* @brief function to set constant values in UHCP header
*
* @internal
*
* @param[out] hdr hdr to set up
* @param[in] type type of packet (request or push)
*/
static inline void uhcp_hdr_set(uhcp_hdr_t *hdr, uhcp_type_t type)
{
hdr->uhcp_magic = htonl(UHCP_MAGIC);
hdr->ver_type = (UHCP_VER << 4) | (type & 0xF);
}
/**
* @brief UDP send function used by UHCP client / server
*
* Supposed to be implemented by UHCP clients.
*
* @param[in] buf buffer to send
* @param[in] len length of buf
* @param[in] dst ptr to IPv6 destination address
* @param[in] dst_port destination port
* @param[in] dst_iface interface number of destination interface
*/
int udp_sendto(uint8_t *buf, size_t len, uint8_t *dst, uint16_t dst_port, uhcp_iface_t dst_iface);
#ifdef __cplusplus
}
#endif
#endif /* UHCP_H */
/** @} */
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