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120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/*
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Serval Daemon
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Copyright (C) 2012 Serval Project Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _SERVALD_OVERLAY_ADDRESS_H
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#define _SERVALD_OVERLAY_ADDRESS_H
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#include "constants.h"
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// not reachable
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#define REACHABLE_NONE 0
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// immediate neighbour
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#define REACHABLE_DIRECT 1
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// reachable via unicast packet
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#define REACHABLE_UNICAST 2
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// packets must be routed
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#define REACHABLE_INDIRECT 3
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// packets can probably be flooded to this peer with ttl=2
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// (temporary state for new peers before path discovery has finished)
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#define REACHABLE_BROADCAST 4
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// this subscriber is in our keystore
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#define REACHABLE_SELF 5
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/* Codes used to describe abbreviated addresses.
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Values 0x10 - 0xff are the first byte of, and implicit indicators of addresses written in full */
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#define OA_CODE_SELF 0x00
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#define OA_CODE_INDEX 0x01
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#define OA_CODE_02 0x02
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#define OA_CODE_PREVIOUS 0x03
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#define OA_CODE_04 0x04
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#define OA_CODE_PREFIX3 0x05
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#define OA_CODE_PREFIX7 0x06
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#define OA_CODE_PREFIX11 0x07
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#define OA_CODE_FULL_INDEX1 0x08
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#define OA_CODE_PREFIX3_INDEX1 0x09
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#define OA_CODE_PREFIX7_INDEX1 0x0a
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#define OA_CODE_PREFIX11_INDEX1 0x0b
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#define OA_CODE_0C 0x0c
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#define OA_CODE_PREFIX11_INDEX2 0x0d
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#define OA_CODE_FULL_INDEX2 0x0e
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/* The TTL field in a frame is used to differentiate between link-local and wide-area broadcasts */
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#define OA_CODE_BROADCAST 0x0f
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#define BROADCAST_LEN 8
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// This structure supports both our own routing protocol which can store calculation details in *node
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// or IP4 addresses reachable via any other kind of normal layer3 routing protocol, eg olsr
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struct subscriber{
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unsigned char sid[SID_SIZE];
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// minimum abbreviation length, in 4bit nibbles.
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int abbreviate_len;
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// should we send the full address once?
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int send_full;
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// overlay routing information
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struct overlay_node *node;
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// result of routing calculations;
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int reachable;
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union{
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// if indirect, who is the next hop?
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struct subscriber *next_hop;
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struct{
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// if direct, where do we send packets?
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struct overlay_interface *interface;
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// if reachable==REACHABLE_UNICAST use this address & sequence number, else use the interface broadcast address
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struct sockaddr_in address;
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};
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};
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};
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struct broadcast{
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unsigned char id[BROADCAST_LEN];
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};
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extern struct subscriber *my_subscriber;
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struct subscriber *find_subscriber(const unsigned char *sid, int len, int create);
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void enum_subscribers(struct subscriber *start, int(*callback)(struct subscriber *, void *), void *context);
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int subscriber_is_reachable(struct subscriber *subscriber);
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int reachable_unicast(struct subscriber *subscriber, overlay_interface *interface, struct in_addr addr, int port);
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int load_subscriber_address(struct subscriber *subscriber);
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int overlay_broadcast_drop_check(struct broadcast *addr);
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int overlay_broadcast_generate_address(struct broadcast *addr);
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int overlay_broadcast_append(struct overlay_buffer *b, struct broadcast *broadcast);
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int overlay_address_append(struct overlay_buffer *b, struct subscriber *subscriber);
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int overlay_address_append_self(overlay_interface *interface, struct overlay_buffer *b);
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int overlay_address_parse(struct overlay_buffer *b, struct broadcast *broadcast, struct subscriber **subscriber);
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void overlay_address_clear(void);
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void overlay_address_set_sender(struct subscriber *subscriber);
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#endif
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