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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 */