serval-dna/overlay_address.h
2013-05-29 11:58:05 +09:30

128 lines
4.1 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
// this subscriber is in our keystore
#define REACHABLE_SELF (1<<0)
// immediate neighbour broadcast packet
#define REACHABLE_BROADCAST (1<<1)
// reachable directly via unicast packet
#define REACHABLE_UNICAST (1<<2)
// packets must be routed via next_hop
#define REACHABLE_INDIRECT (1<<3)
#define REACHABLE_ASSUMED (1<<4)
#define REACHABLE_DIRECT (REACHABLE_BROADCAST|REACHABLE_UNICAST)
#define REACHABLE (REACHABLE_DIRECT|REACHABLE_INDIRECT)
#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;
// sequence number for this unicast or broadcast destination
int sequence;
// overlay routing information
struct overlay_node *node;
// link state routing information
struct link_state *link_state;
// result of routing calculations;
int reachable;
// if indirect, who is the next hop?
struct subscriber *next_hop;
// if direct, or unicast, where do we send packets?
struct overlay_interface *interface;
// if reachable&REACHABLE_UNICAST send packets to this address, else use the interface broadcast address
struct sockaddr_in address;
time_ms_t last_stun_request;
time_ms_t last_probe;
time_ms_t last_probe_response;
time_ms_t last_tx;
// public signing key details for remote peers
unsigned char sas_public[SAS_SIZE];
time_ms_t sas_last_request;
unsigned char sas_valid;
// private keys for local identities
keyring_identity *identity;
};
struct broadcast{
unsigned char id[BROADCAST_LEN];
};
struct decode_context{
struct overlay_interface *interface;
int sender_interface;
struct sockaddr_in addr;
int invalid_addresses;
struct overlay_frame *please_explain;
struct subscriber *sender;
struct subscriber *previous;
};
extern struct subscriber *my_subscriber;
extern struct subscriber *directory_service;
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 set_reachable(struct subscriber *subscriber, int reachable);
int reachable_unicast(struct subscriber *subscriber, overlay_interface *interface, struct in_addr addr, int port);
int load_subscriber_address(struct subscriber *subscriber);
int process_explain(struct overlay_frame *frame);
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 decode_context *context, struct overlay_buffer *b, struct subscriber *subscriber);
int overlay_broadcast_parse(struct overlay_buffer *b, struct broadcast *broadcast);
int overlay_address_parse(struct decode_context *context, struct overlay_buffer *b, struct subscriber **subscriber);
int send_please_explain(struct decode_context *context, struct subscriber *source, struct subscriber *destination);
#endif