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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_kernel.h"
typedef u_int32_t u32;
typedef u_int8_t u8;
#include <linux/jhash.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
typedef struct private_ha_kernel_t private_ha_kernel_t;
/**
* Private data of an ha_kernel_t object.
*/
struct private_ha_kernel_t {
/**
* Public ha_kernel_t interface.
*/
ha_kernel_t public;
/**
* Init value for jhash
*/
u_int initval;
/**
* Total number of ClusterIP segments
*/
u_int count;
/**
* List of virtual addresses, as host_t*
*/
linked_list_t *virtuals;
};
/**
* Implementation of ha_kernel_t.in_segment
*/
static bool in_segment(private_ha_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->count) >> 32) + 1 == segment)
{
return TRUE;
}
}
return FALSE;
}
/**
* Activate/Deactivate a segment
*/
static void activate_deactivate(private_ha_kernel_t *this,
u_int segment, char op)
{
enumerator_t *enumerator;
host_t *host;
char cmd[8], file[256];
int fd;
enumerator = this->virtuals->create_enumerator(this->virtuals);
while (enumerator->enumerate(enumerator, &host))
{
snprintf(file, sizeof(file), "/proc/net/ipt_CLUSTERIP/%H", host);
snprintf(cmd, sizeof(cmd), "%c%d\n", op, segment);
fd = open(file, O_WRONLY);
if (fd == -1)
{
DBG1(DBG_CFG, "opening CLUSTERIP file '%s' failed: %s",
file, strerror(errno));
continue;
}
if (write(fd, cmd, strlen(cmd) == -1))
{
DBG1(DBG_CFG, "writing to CLUSTERIP file '%s' failed: %s",
file, strerror(errno));
}
close(fd);
}
enumerator->destroy(enumerator);
}
/**
* Implementation of ha_kernel_t.activate
*/
static void activate(private_ha_kernel_t *this, u_int segment)
{
activate_deactivate(this, segment, '+');
}
/**
* Implementation of ha_kernel_t.deactivate
*/
static void deactivate(private_ha_kernel_t *this, u_int segment)
{
activate_deactivate(this, segment, '-');
}
/**
* Mangle IPtable rules for virtual addresses
*/
static bool mangle_rules(private_ha_kernel_t *this, bool add)
{
enumerator_t *enumerator;
host_t *host;
u_char i, mac = 0x20;
char *iface, buf[256];
enumerator = this->virtuals->create_enumerator(this->virtuals);
while (enumerator->enumerate(enumerator, &host))
{
iface = charon->kernel_interface->get_interface(
charon->kernel_interface, host);
if (!iface)
{
DBG1(DBG_CFG, "cluster address %H not installed, ignored", host);
this->virtuals->remove_at(this->virtuals, enumerator);
host->destroy(host);
continue;
}
/* iptables insists of a local node specification, enable node 1 */
snprintf(buf, sizeof(buf),
"/sbin/iptables -%c INPUT -i %s -d %H -j CLUSTERIP --new "
"--hashmode sourceip --clustermac 01:00:5e:00:00:%2x "
"--total-nodes %d --local-node 1",
add ? 'A' : 'D', iface, host, mac++, this->count);
free(iface);
if (system(buf) != 0)
{
DBG1(DBG_CFG, "installing CLUSTERIP rule '%s' failed", buf);
}
}
enumerator->destroy(enumerator);
if (add)
{
for (i = 2; i <= this->count; i++)
{
activate(this, i);
}
}
return TRUE;
}
/**
* Parse the list of virtual cluster addresses
*/
static void parse_virtuals(private_ha_kernel_t *this, char *virtual)
{
enumerator_t *enumerator;
host_t *host;
enumerator = enumerator_create_token(virtual, ",", " ");
while (enumerator->enumerate(enumerator, &virtual))
{
host = host_create_from_string(virtual, 0);
if (host)
{
this->virtuals->insert_last(this->virtuals, host);
}
else
{
DBG1(DBG_CFG, "virtual cluster address '%s' invalid, ignored",
virtual);
}
}
enumerator->destroy(enumerator);
}
/**
* Implementation of ha_kernel_t.destroy.
*/
static void destroy(private_ha_kernel_t *this)
{
mangle_rules(this, FALSE);
this->virtuals->destroy_offset(this->virtuals, offsetof(host_t, destroy));
free(this);
}
/**
* See header
*/
ha_kernel_t *ha_kernel_create(u_int count, char *virtuals)
{
private_ha_kernel_t *this = malloc_thing(private_ha_kernel_t);
this->public.in_segment = (bool(*)(ha_kernel_t*, host_t *host, u_int segment))in_segment;
this->public.activate = (void(*)(ha_kernel_t*, u_int segment))activate;
this->public.deactivate = (void(*)(ha_kernel_t*, u_int segment))deactivate;
this->public.destroy = (void(*)(ha_kernel_t*))destroy;
this->initval = 0;
this->count = count;
this->virtuals = linked_list_create();
parse_virtuals(this, virtuals);
if (!mangle_rules(this, TRUE))
{
destroy(this);
return NULL;
}
return &this->public;
}
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