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142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
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* Copyright (C) 2004 Mike Wray <mike.wray@hp.com>.
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of the
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* License, or (at your option) any later version. This library is
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* distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _VNET_VCACHE_H_
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#define _VNET_VCACHE_H_
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#include "hash_table.h"
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/** Time-to-live of varp cache entries (in seconds).*/
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#define VCACHE_ENTRY_TTL 30.0
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/** Maximum number of varp probes to make. */
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#define VCACHE_PROBE_MAX 5
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/** Interval between varp probes (in seconds). */
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#define VCACHE_PROBE_INTERVAL 3.0
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/** Delay before forwarding a local probe (in seconds). */
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#define VCACHE_LOCAL_DELAY 2.0
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/** Number of buckets in the varp cache (must be prime). */
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#define VCACHE_BUCKETS 3001
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enum {
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VCACHE_STATE_INCOMPLETE = 1,
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VCACHE_STATE_REACHABLE = 2,
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VCACHE_STATE_FAILED = 3
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};
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enum {
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VCACHE_FLAG_PROBING = 1,
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VCACHE_FLAG_PERMANENT = 2,
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VCACHE_FLAG_LOCAL_PROBE = 4,
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VCACHE_FLAG_REMOTE_PROBE = 8,
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};
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#include <asm/byteorder.h>
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/*
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* Display an IP address in readable format.
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*/
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#define NIPQUAD(addr) \
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((unsigned char *)&addr)[0], \
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((unsigned char *)&addr)[1], \
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((unsigned char *)&addr)[2], \
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((unsigned char *)&addr)[3]
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#if defined(__LITTLE_ENDIAN)
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#define HIPQUAD(addr) \
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((unsigned char *)&addr)[3], \
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((unsigned char *)&addr)[2], \
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((unsigned char *)&addr)[1], \
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((unsigned char *)&addr)[0]
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#elif defined(__BIG_ENDIAN)
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#define HIPQUAD NIPQUAD
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#else
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#error "Please fix asm/byteorder.h"
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#endif /* __LITTLE_ENDIAN */
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#define IPFMT "%u.%u.%u.%u"
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#define MACFMT "%02x:%02x:%02x:%02x:%02x:%02x"
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#define MAC6TUPLE(_mac) (_mac)[0], (_mac)[1], (_mac)[2], (_mac)[3], (_mac)[4], (_mac)[5]
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typedef struct IPMessage {
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Conn *conn;
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struct sockaddr_in saddr;
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struct sockaddr_in daddr;
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void *data;
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struct IPMessage *next;
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} IPMessage;
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typedef struct IPMessageQueue {
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IPMessage *msg;
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int len;
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int maxlen;
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} IPMessageQueue;
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/** Key for varp cache entries. */
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typedef struct VCKey {
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/** Vnet id (network order). */
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uint32_t vnet;
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/** Virtual MAC address. */
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Vmac vmac;
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} VCKey;
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typedef struct VCEntry {
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/** Key for the entry. */
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VCKey key;
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/** Care-of address for the key. */
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uint32_t addr;
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/** Alias coa if we are a gateway. */
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//uint32_t gateway;
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/** Encapsulation to use (if a gateway). */
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//uint32_t encaps;
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/** Where this entry came from. */
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uint32_t source;
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/** Last-updated timestamp. */
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double timestamp;
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/** State. */
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short state;
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/** Flags. */
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short flags;
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/** Number of probes sent. */
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int probes;
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/** List of messages to reply to when completes. */
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IPMessageQueue queue;
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} VCEntry;
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/** The varp cache. Varp cache entries indexed by VCKey. */
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typedef struct VarpCache {
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HashTable *table;
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} VarpCache;
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int vcache_init(void);
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int vcache_handle_message(IPMessage *msg, int local);
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#endif /* ! _VNET_VCACHE_H_ */
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