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/*
* IP_ALIAS (AF_INET) aliasing module.
*
*
* Version: @(#)ip_alias.c 0.50 6/14/97
*
* Author: Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar>
*
* Fixes:
* JJC : ip_alias_dev_select method.
* JJC : use ip_rt_dev instead of ip_rt_route
* JJC : new no_sel semantics
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/if.h>
#include <linux/inet.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/route.h>
#include <net/route.h>
#ifdef ALIAS_USER_LAND_DEBUG
#include "net_alias.h"
#include "ip_alias.h"
#include "user_stubs.h"
#endif
#include <linux/net_alias.h>
#include <net/ip_alias.h>
/*
* AF_INET alias init
*/
static int ip_alias_init_1(struct net_alias_type *this, struct net_alias *alias, struct sockaddr *sa)
{
#ifdef ALIAS_USER_LAND_DEBUG
printk("alias_init(%s) called.\n", alias->name);
#endif
MOD_INC_USE_COUNT;
return 0;
}
/*
* AF_INET alias done
*/
static int ip_alias_done_1(struct net_alias_type *this, struct net_alias *alias)
{
#ifdef ALIAS_USER_LAND_DEBUG
printk("alias_done(%s) called.\n", alias->name);
#endif
MOD_DEC_USE_COUNT;
return 0;
}
/*
* Print alias address info
*/
int ip_alias_print_1(struct net_alias_type *this, struct net_alias *alias, char *buf, int len)
{
char *p;
p = (char *) &alias->dev.pa_addr;
return sprintf(buf, "%d.%d.%d.%d",
(p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255));
}
/*
* Called by net_alias module when no local alias address has been hit,
* to find out if an alias is a better candidate for handling given addr
*/
struct device *ip_alias_dev_select(struct net_alias_type *this, struct device *main_dev, struct sockaddr *sa)
{
__u32 addr;
/*
* Defensive...
*/
if (main_dev == NULL)
return NULL;
/*
* Get u32 address.
*/
addr = (sa)? (*(struct sockaddr_in *)sa).sin_addr.s_addr : 0;
if (addr == 0)
return NULL;
/*
* Find 'closest' device to address given. any other suggestions? ...
* net_alias module will check if returned device is main_dev's alias
*/
/*
* Fixed arping caused by incorrectly using ip_rt_route(),
* ip_rt_dev() just returns routing device without hh generation.
*/
return ip_rt_dev(addr);
}
/*
* net_alias AF_INET type defn.
*/
struct net_alias_type ip_alias_type =
{
AF_INET, /* type */
0, /* n_attach */
"ip", /* name */
NULL, /* get_addr32() */
NULL, /* dev_addr_chk() */
ip_alias_dev_select, /* dev_select() */
ip_alias_init_1, /* alias_init_1() */
ip_alias_done_1, /* alias_done_1() */
ip_alias_print_1, /* alias_print_1() */
NULL /* next */
};
/*
* ip_alias module initialization
*/
int ip_alias_init(void)
{
return register_net_alias_type(&ip_alias_type, AF_INET);
}
/*
* ip_alias module done
*/
int ip_alias_done(void)
{
return unregister_net_alias_type(&ip_alias_type);
}
#ifdef MODULE
/*
* If no_sel is set, alias association (device selection) with
* foreign addresses will be disabled.
* You will get:
* - faster operation by avoiding completely routing lookups
* You will loose:
* - inter-alias routing
* - proxyarp over aliases
*/
int no_sel = 0;
int init_module(void)
{
if (no_sel)
ip_alias_type.dev_select = NULL;
if (ip_alias_init() != 0)
return -EIO;
return 0;
}
void cleanup_module(void)
{
if (ip_alias_done() != 0)
printk(KERN_INFO "ip_alias: can't remove module");
}
#endif /* MODULE */
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