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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
Jeff Kirshera99421d2013-12-06 09:13:39 -080018 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070019 */
20/*
21 * Authors:
22 * Noriaki TAKAMIYA @USAGI
23 * Masahide NAKAMURA @USAGI
24 */
25
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/skbuff.h>
Herbert Xua2deb6d22007-11-13 21:39:38 -080030#include <linux/spinlock.h>
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070031#include <linux/stringify.h>
Herbert Xu45b17f42007-10-08 17:27:19 -070032#include <linux/time.h>
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070033#include <net/ipv6.h>
34#include <net/xfrm.h>
35
36/* Add route optimization header space.
37 *
38 * The IP header and mutable extension headers will be moved forward to make
39 * space for the route optimization header.
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070040 */
Jamal Hadi Salimeb878e82006-08-31 17:42:59 -070041static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070042{
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070043 struct ipv6hdr *iph;
44 u8 *prevhdr;
45 int hdr_len;
46
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -070047 iph = ipv6_hdr(skb);
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070048
49 hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
Herbert Xu007f0212007-10-09 13:25:59 -070050 skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
Herbert Xu7b277b12007-10-10 15:44:06 -070051 skb_set_network_header(skb, -x->props.header_len);
Herbert Xu37fedd32007-10-10 15:44:44 -070052 skb->transport_header = skb->network_header + hdr_len;
Herbert Xu7b277b12007-10-10 15:44:06 -070053 __skb_pull(skb, hdr_len);
54 memmove(ipv6_hdr(skb), iph, hdr_len);
Herbert Xu45b17f42007-10-08 17:27:19 -070055
56 x->lastused = get_seconds();
57
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070058 return 0;
59}
60
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070061static struct xfrm_mode xfrm6_ro_mode = {
Masahide NAKAMURA1d716272006-08-23 17:59:44 -070062 .output = xfrm6_ro_output,
63 .owner = THIS_MODULE,
64 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
65};
66
67static int __init xfrm6_ro_init(void)
68{
69 return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
70}
71
72static void __exit xfrm6_ro_exit(void)
73{
74 int err;
75
76 err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
77 BUG_ON(err);
78}
79
80module_init(xfrm6_ro_init);
81module_exit(xfrm6_ro_exit);
82MODULE_LICENSE("GPL");
83MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);