arp.h

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#pragma once
/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/*
 * $Id: a7bcc2eea215a780785d07b9e88b212586490818 $
 *
 * @file protocols/arp/arp.h
 * @brief Structures and prototypes for base RADIUS functionality.
 *
 * @copyright 2020 Network RADIUS SAS (legal@networkradius.com)
 */
#include <freeradius-devel/util/packet.h>
#include <freeradius-devel/util/rand.h>
#include <freeradius-devel/util/log.h>
#include <freeradius-devel/util/net.h>
 
#include <freeradius-devel/protocol/arp/dictionary.h>
#include <freeradius-devel/protocol/arp/rfc826.h>
 
/* for SIOCSARP, and fr_arp_entry_add */
#include <sys/ioctl.h>
 
#define FR_ARP_PACKET_SIZE (28)
#define ETH_TYPE_ARP (0x0806)
 
int fr_arp_global_init(void);
void fr_arp_global_free(void);
 
ssize_t fr_arp_encode(fr_dbuff_t *dbuff, uint8_t const *original, fr_pair_list_t *vps);
ssize_t fr_arp_decode(TALLOC_CTX *ctx, fr_pair_list_t *out, uint8_t const *packet, size_t packet_len);
 
int fr_arp_entry_add(int fd, char const *interface, uint8_t ipaddr[static 4], uint8_t macaddr[static 6]);
 
/*
 *      ARP for ethernet && IPv4.
 */
typedef struct {
        uint8_t         htype[2];               //!< Format of hardware address.
        uint8_t         ptype[2];               //!< Format of protocol address.
        uint8_t         hlen;                   //!< Length of hardware address.
        uint8_t         plen;                   //!< Length of protocol address.
        uint8_t         op[2];                  //!< 1 - Request, 2 - Reply.
        uint8_t         sha[ETHER_ADDR_LEN];    //!< sender hardware address.
        uint8_t         spa[4];                 //!< Sender protocol address.
        uint8_t         tha[ETHER_ADDR_LEN];    //!< Target hardware address.
        uint8_t         tpa[4];                 //!< Target protocol address.
} fr_arp_packet_t;
 
typedef enum {
        FR_ARP_INVALID = 0,
        FR_ARP_REQUEST = 1,
        FR_ARP_REPLY = 2,
        FR_ARP_REVERSE_REQUEST = 3,
        FR_ARP_REVERSE_REPLY = 4,
        FR_ARP_CODE_MAX = 5,
        FR_ARP_DO_NOT_RESPOND = 256,
} fr_arp_packet_code_t;
 
#define FR_ARP_PACKET_CODE_VALID(_code) (((_code) > 0) && ((_code) < FR_ARP_CODE_MAX))
 
extern char const *fr_arp_packet_codes[FR_ARP_CODE_MAX];