mirror of
https://github.com/servalproject/serval-dna.git
synced 2024-12-19 13:17:56 +00:00
114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/*
|
|
Serval Daemon
|
|
Copyright (C) 2012 Serval Project Inc.
|
|
|
|
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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef _SERVALD_OVERLAY_ADDRESS_H
|
|
#define _SERVALD_OVERLAY_ADDRESS_H
|
|
|
|
#include "constants.h"
|
|
|
|
// not reachable
|
|
#define REACHABLE_NONE 0
|
|
|
|
// immediate neighbour
|
|
#define REACHABLE_DIRECT 1
|
|
|
|
// packets must be routed
|
|
#define REACHABLE_INDIRECT 2
|
|
|
|
// packets can probably be flooded to this peer with ttl=2
|
|
// (temporary state for new peers before path discovery has finished)
|
|
#define REACHABLE_BROADCAST 3
|
|
|
|
// this subscriber is in our keystore
|
|
#define REACHABLE_SELF 4
|
|
|
|
/* Codes used to describe abbreviated addresses.
|
|
Values 0x10 - 0xff are the first byte of, and implicit indicators of addresses written in full */
|
|
#define OA_CODE_SELF 0x00
|
|
#define OA_CODE_INDEX 0x01
|
|
#define OA_CODE_02 0x02
|
|
#define OA_CODE_PREVIOUS 0x03
|
|
#define OA_CODE_04 0x04
|
|
#define OA_CODE_PREFIX3 0x05
|
|
#define OA_CODE_PREFIX7 0x06
|
|
#define OA_CODE_PREFIX11 0x07
|
|
#define OA_CODE_FULL_INDEX1 0x08
|
|
#define OA_CODE_PREFIX3_INDEX1 0x09
|
|
#define OA_CODE_PREFIX7_INDEX1 0x0a
|
|
#define OA_CODE_PREFIX11_INDEX1 0x0b
|
|
#define OA_CODE_0C 0x0c
|
|
#define OA_CODE_PREFIX11_INDEX2 0x0d
|
|
#define OA_CODE_FULL_INDEX2 0x0e
|
|
/* The TTL field in a frame is used to differentiate between link-local and wide-area broadcasts */
|
|
#define OA_CODE_BROADCAST 0x0f
|
|
|
|
#define BROADCAST_LEN 8
|
|
|
|
|
|
// This structure supports both our own routing protocol which can store calculation details in *node
|
|
// or IP4 addresses reachable via any other kind of normal layer3 routing protocol, eg olsr
|
|
struct subscriber{
|
|
unsigned char sid[SID_SIZE];
|
|
// minimum abbreviation length, in 4bit nibbles.
|
|
int abbreviate_len;
|
|
|
|
// should we send the full address once?
|
|
int send_full;
|
|
|
|
// overlay routing information
|
|
struct overlay_node *node;
|
|
|
|
// result of routing calculations;
|
|
int reachable;
|
|
union{
|
|
// if indirect, who is the next hop?
|
|
struct subscriber *next_hop;
|
|
|
|
struct{
|
|
// if direct, where do we send packets?
|
|
struct overlay_interface *interface;
|
|
// if s_addr == INADDR_ANY, send to the interface broadcast address
|
|
struct sockaddr_in address;
|
|
};
|
|
};
|
|
};
|
|
|
|
struct broadcast{
|
|
unsigned char id[BROADCAST_LEN];
|
|
};
|
|
|
|
extern struct subscriber *my_subscriber;
|
|
|
|
struct subscriber *find_subscriber(const unsigned char *sid, int len, int create);
|
|
void enum_subscribers(struct subscriber *start, int(*callback)(struct subscriber *, void *), void *context);
|
|
int subscriber_is_reachable(struct subscriber *subscriber);
|
|
int reachable_unicast(struct subscriber *subscriber, overlay_interface *interface, struct in_addr addr, int port);
|
|
|
|
int overlay_broadcast_drop_check(struct broadcast *addr);
|
|
int overlay_broadcast_generate_address(struct broadcast *addr);
|
|
|
|
int overlay_broadcast_append(struct overlay_buffer *b, struct broadcast *broadcast);
|
|
int overlay_address_append(struct overlay_buffer *b, struct subscriber *subscriber);
|
|
int overlay_address_parse(struct overlay_buffer *b, struct broadcast *broadcast, struct subscriber **subscriber);
|
|
void overlay_address_clear(void);
|
|
void overlay_address_set_sender(struct subscriber *subscriber);
|
|
|
|
|
|
#endif
|