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/*
* Copyright (C) 2014 Freie Universitรคt Berlin
*
* 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.
*/
/**
* @ingroup nhdp
* @{
*
* @file
* @brief Centralized address storage interface for NHDP
*
* @author Fabian Nack <nack@inf.fu-berlin.de>
*/
#ifndef NHDP_ADDRESS_H_
#define NHDP_ADDRESS_H_
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief NHDP address representation
*/
typedef struct nhdp_addr {
uint8_t *addr; /**< Pointer to the address data */
size_t addr_size; /**< Size in bytes of the address */
uint8_t addr_type; /**< AF type for the address */
uint8_t usg_count; /**< Usage count in information bases */
uint8_t in_tmp_table; /**< Signals usage in a writers temp table */
uint16_t tmp_metric_val; /**< Encoded metric value used during HELLO processing */
struct nhdp_addr *next; /**< Pointer to next address (used in central storage) */
} nhdp_addr_t;
/**
* @brief Container for NHDP address storage in a list
*/
typedef struct nhdp_addr_entry {
struct nhdp_addr *address; /**< Pointer to NHDP address storage entry */
struct nhdp_addr_entry *next; /**< Pointer to the next address list element */
} nhdp_addr_entry_t;
/**
* @name NHDP address temp usage helper macros
*
* @{
*/
#define NHDP_ADDR_TMP_NONE (0x00)
#define NHDP_ADDR_TMP_ANY (0x01)
#define NHDP_ADDR_TMP_SYM (0x03)
#define NHDP_ADDR_TMP_REM_LIST (0x04)
#define NHDP_ADDR_TMP_TH_REM_LIST (0x08)
#define NHDP_ADDR_TMP_TH_SYM_LIST (0x10)
#define NHDP_ADDR_TMP_NB_LIST (0x20)
#define NHDP_ADDR_TMP_SEND_LIST (0x60)
#define NHDP_ADDR_TMP_IN_ANY(addr) ((addr->in_tmp_table & 0x01))
#define NHDP_ADDR_TMP_IN_SYM(addr) ((addr->in_tmp_table & 0x02) >> 1)
#define NHDP_ADDR_TMP_IN_REM_LIST(addr) ((addr->in_tmp_table & 0x04) >> 2)
#define NHDP_ADDR_TMP_IN_TH_REM_LIST(addr) ((addr->in_tmp_table & 0x08) >> 3)
#define NHDP_ADDR_TMP_IN_TH_SYM_LIST(addr) ((addr->in_tmp_table & 0x10) >> 4)
#define NHDP_ADDR_TMP_IN_NB_LIST(addr) ((addr->in_tmp_table & 0x20) >> 5)
#define NHDP_ADDR_TMP_IN_SEND_LIST(addr) ((addr->in_tmp_table & 0x40) >> 6)
/** @} */
/**
* @brief Get or create a NHDP address for the given address
*
* @param[in] addr Pointer to the given address
* @param[in] addr_size Length in bytes of the given address
* @param[in] addr_type AF type of the given address
*
* @return Pointer to the NHDP address representation of the given address
* @return NULL on error
*/
nhdp_addr_t *nhdp_addr_db_get_address(uint8_t *addr, size_t addr_size, uint8_t addr_type);
/**
* @brief Decrement the usage counter of a given NHDP address
*
* The NHDP address is deleted if the usage counter reaches zero.
*
* @param[in] addr Pointer to the NHDP address
*/
void nhdp_decrement_addr_usage(nhdp_addr_t *addr);
/**
* @brief Free the given address list
*
* This function frees every address list entry of the given address list.
*
* @param[in] list_head Pointer to the head of the address list to free
*/
void nhdp_free_addr_list(nhdp_addr_entry_t *list_head);
/**
* @brief Free the given address list entry
*
* Additionally to freeing the address entry, this function takes care that
* the usage counter of the list entry's address is decremented.
*
* @param[in] addr_entry Pointer to the address list entry to free
*/
void nhdp_free_addr_entry(nhdp_addr_entry_t *addr_entry);
/**
* @brief Construct an addr list containing all addresses with
* the given tmp_type
*
* @return Pointer to the head of the newly created address list
* @return NULL on error
*/
nhdp_addr_entry_t *nhdp_generate_addr_list_from_tmp(uint8_t tmp_type);
/**
* @brief Reset in_tmp_table flag of all NHDP addresses
*
* @note
* Must not be called from outside the NHDP writer's or reader's message creation process.
*
* @param[in] decr_usg Flag whether the usage counter of a resetted addr has to be decremented
*/
void nhdp_reset_addresses_tmp_usg(uint8_t decr_usg);
/**
* @brief Get a pointer to the head of the address storage list
*
* @return Pointer to the head of the central storage address list
* @return NULL if no addresses are registered
*/
nhdp_addr_t *nhdp_get_addr_db_head(void);
#ifdef __cplusplus
}
#endif
#endif /* NHDP_ADDRESS_H_ */
/** @} */
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