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/*

 * xfrm6_mode_ro.c - Route optimization mode for IPv6.

 *

 * Copyright (C)2003-2006 Helsinki University of Technology

 * Copyright (C)2003-2006 USAGI/WIDE Project

 *

 * 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.

 *

 * 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.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

/*

 * Authors:

 *      Noriaki TAKAMIYA @USAGI

 *      Masahide NAKAMURA @USAGI

 */

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/skbuff.h>

#include <linux/stringify.h>

#include <linux/time.h>

#include <net/ipv6.h>

#include <net/xfrm.h>

/* Add route optimization header space.

 *

 * The IP header and mutable extension headers will be moved forward to make

 * space for the route optimization header.

 */

static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)

{

        struct ipv6hdr *iph;

        u8 *prevhdr;

        int hdr_len;

        iph = ipv6_hdr(skb);

        hdr_len = x->type->hdr_offset(x, skb, &prevhdr);

        skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);

        skb_set_network_header(skb, -x->props.header_len);

        skb->transport_header = skb->network_header + hdr_len;

        __skb_pull(skb, hdr_len);

        memmove(ipv6_hdr(skb), iph, hdr_len);

        x->lastused = get_seconds();

        return 0;

}

static struct xfrm_mode xfrm6_ro_mode = {

        .output = xfrm6_ro_output,

        .owner = THIS_MODULE,

        .encap = XFRM_MODE_ROUTEOPTIMIZATION,

};

static int __init xfrm6_ro_init(void)

{

        return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);

}

static void __exit xfrm6_ro_exit(void)

{

        int err;

        err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);

        BUG_ON(err);

}

module_init(xfrm6_ro_init);

module_exit(xfrm6_ro_exit);

MODULE_LICENSE("GPL");

MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);