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Masahide NAKAMURA1d716272006-08-23 17:59:44 -07001/*
2 * xfrm6_mode_ro.c - Route optimization mode for IPv6.
3 *
4 * Copyright (C)2003-2006 Helsinki University of Technology
5 * Copyright (C)2003-2006 USAGI/WIDE Project
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21/*
22 * Authors:
23 * Noriaki TAKAMIYA @USAGI
24 * Masahide NAKAMURA @USAGI
25 */
26
27#include <linux/init.h>
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/skbuff.h>
Herbert Xua2deb6d22007-11-13 21:39:38 -080031#include <linux/spinlock.h>
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070032#include <linux/stringify.h>
Herbert Xu45b17f42007-10-08 17:27:19 -070033#include <linux/time.h>
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070034#include <net/ipv6.h>
35#include <net/xfrm.h>
36
37/* Add route optimization header space.
38 *
39 * The IP header and mutable extension headers will be moved forward to make
40 * space for the route optimization header.
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070041 */
Jamal Hadi Salimeb878e82006-08-31 17:42:59 -070042static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070043{
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070044 struct ipv6hdr *iph;
45 u8 *prevhdr;
46 int hdr_len;
47
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -070048 iph = ipv6_hdr(skb);
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070049
50 hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
Herbert Xu007f0212007-10-09 13:25:59 -070051 skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
Herbert Xu7b277b12007-10-10 15:44:06 -070052 skb_set_network_header(skb, -x->props.header_len);
Herbert Xu37fedd32007-10-10 15:44:44 -070053 skb->transport_header = skb->network_header + hdr_len;
Herbert Xu7b277b12007-10-10 15:44:06 -070054 __skb_pull(skb, hdr_len);
55 memmove(ipv6_hdr(skb), iph, hdr_len);
Herbert Xu45b17f42007-10-08 17:27:19 -070056
57 x->lastused = get_seconds();
58
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070059 return 0;
60}
61
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070062static struct xfrm_mode xfrm6_ro_mode = {
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070063 .output = xfrm6_ro_output,
64 .owner = THIS_MODULE,
65 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
66};
67
68static int __init xfrm6_ro_init(void)
69{
70 return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
71}
72
73static void __exit xfrm6_ro_exit(void)
74{
75 int err;
76
77 err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
78 BUG_ON(err);
79}
80
81module_init(xfrm6_ro_init);
82module_exit(xfrm6_ro_exit);
83MODULE_LICENSE("GPL");
84MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);