message.h

// SPDX-License-Identifier: MIT
/*
Copyright (c) 2007, 2008 by Juliusz Chroboczek
*/

#ifndef BABEL_MESSAGE_H
#define BABEL_MESSAGE_H

#include "babel_interface.h"

#define MAX_BUFFERED_UPDATES 200

#define BUCKET_TOKENS_MAX 200
#define BUCKET_TOKENS_PER_SEC 40

/* A registry of assigned TLV and sub-TLV types is available at
   http://www.pps.univ-paris-diderot.fr/~jch/software/babel/babel-tlv-registry.text
*/
#define MESSAGE_PAD1 0
#define MESSAGE_PADN 1
#define MESSAGE_ACK_REQ 2
#define MESSAGE_ACK 3
#define MESSAGE_HELLO 4
#define MESSAGE_IHU 5
#define MESSAGE_ROUTER_ID 6
#define MESSAGE_NH 7
#define MESSAGE_UPDATE 8
#define MESSAGE_REQUEST 9
#define MESSAGE_MH_REQUEST 10
#define MESSAGE_MAX 10

/* Protocol extension through sub-TLVs. */
#define SUBTLV_PAD1 0
#define SUBTLV_PADN 1
#define SUBTLV_DIVERSITY 2 /* Also known as babelz. */
#define SUBTLV_TIMESTAMP 3 /* Used to compute RTT. */
#define SUBTLV_SOURCE_PREFIX 128 /* Source-specific routing. */
#define SUBTLV_MANDATORY 0x80

extern unsigned short myseqno;

extern int broadcast_ihu;
extern int split_horizon;

extern struct neighbour *unicast_neighbour;
extern struct timeval unicast_flush_timeout;

void parse_packet(const unsigned char *from, struct interface *ifp,
                  const unsigned char *packet, int packetlen);
void flushbuf(struct interface *ifp);
void flushupdates(struct interface *ifp);
void send_ack(struct neighbour *neigh, unsigned short nonce,
              unsigned short interval);
void send_hello_noupdate(struct interface *ifp, unsigned interval);
void send_hello(struct interface *ifp);
void flush_unicast(int dofree);
void send_update(struct interface *ifp, int urgent,
                 const unsigned char *prefix, unsigned char plen);
void send_update_resend(struct interface *ifp,
                        const unsigned char *prefix, unsigned char plen);
void send_wildcard_retraction(struct interface *ifp);
void update_myseqno(void);
void send_self_update(struct interface *ifp);
void send_ihu(struct neighbour *neigh, struct interface *ifp);
void send_marginal_ihu(struct interface *ifp);
void send_request(struct interface *ifp,
                  const unsigned char *prefix, unsigned char plen);
void send_unicast_request(struct neighbour *neigh,
                          const unsigned char *prefix, unsigned char plen);
void send_multihop_request(struct interface *ifp,
                           const unsigned char *prefix, unsigned char plen,
                           unsigned short seqno, const unsigned char *id,
                           unsigned short hop_count);
void
send_unicast_multihop_request(struct neighbour *neigh,
                              const unsigned char *prefix, unsigned char plen,
                              unsigned short seqno, const unsigned char *id,
                              unsigned short hop_count);
void send_request_resend(struct neighbour *neigh,
                         const unsigned char *prefix, unsigned char plen,
                         unsigned short seqno, unsigned char *id);
void handle_request(struct neighbour *neigh, const unsigned char *prefix,
                    unsigned char plen, unsigned char hop_count,
                    unsigned short seqno, const unsigned char *id);

#endif