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/*
* Copyright (C) 2009 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "ha_sync_kernel.h"
typedef u_int32_t u32;
typedef u_int8_t u8;
#include <linux/jhash.h>
typedef struct private_ha_sync_kernel_t private_ha_sync_kernel_t;
/**
* Private data of an ha_sync_kernel_t object.
*/
struct private_ha_sync_kernel_t {
/**
* Public ha_sync_kernel_t interface.
*/
ha_sync_kernel_t public;
/**
* Init value for jhash
*/
u_int initval;
/**
* Total number of ClusterIP segments
*/
u_int segment_count;
/**
* mask of active segments
*/
segment_mask_t active;
};
/**
* Implementation of ha_sync_kernel_t.in_segment
*/
static bool in_segment(private_ha_sync_kernel_t *this, host_t *host, u_int segment)
{
if (host->get_family(host) == AF_INET)
{
unsigned long hash;
u_int32_t addr;
addr = *(u_int32_t*)host->get_address(host).ptr;
hash = jhash_1word(ntohl(addr), this->initval);
if ((((u_int64_t)hash * this->segment_count) >> 32) + 1 == segment)
{
return TRUE;
}
}
return FALSE;
}
/**
* Implementation of ha_sync_kernel_t.destroy.
*/
static void destroy(private_ha_sync_kernel_t *this)
{
free(this);
}
/**
* See header
*/
ha_sync_kernel_t *ha_sync_kernel_create(u_int count, segment_mask_t active,
char *external, char *internal)
{
private_ha_sync_kernel_t *this = malloc_thing(private_ha_sync_kernel_t);
this->public.in_segment = (bool(*)(ha_sync_kernel_t*, host_t *host, u_int segment))in_segment;
this->public.destroy = (void(*)(ha_sync_kernel_t*))destroy;
this->initval = 0;
this->segment_count = count;
return &this->public;
}
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