ptrace: cleanup arch_ptrace() on m68k
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / xfrm6_mode_ro.c
blob63d5d493098afd6b250e77b3ef15a880bd7232c7
1 /*
2 * xfrm6_mode_ro.c - Route optimization mode for IPv6.
4 * Copyright (C)2003-2006 Helsinki University of Technology
5 * Copyright (C)2003-2006 USAGI/WIDE Project
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.
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.
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
22 * Authors:
23 * Noriaki TAKAMIYA @USAGI
24 * Masahide NAKAMURA @USAGI
27 #include <linux/init.h>
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/skbuff.h>
31 #include <linux/spinlock.h>
32 #include <linux/stringify.h>
33 #include <linux/time.h>
34 #include <net/ipv6.h>
35 #include <net/xfrm.h>
37 /* Add route optimization header space.
39 * The IP header and mutable extension headers will be moved forward to make
40 * space for the route optimization header.
42 static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
44 struct ipv6hdr *iph;
45 u8 *prevhdr;
46 int hdr_len;
48 iph = ipv6_hdr(skb);
50 hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
51 skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
52 skb_set_network_header(skb, -x->props.header_len);
53 skb->transport_header = skb->network_header + hdr_len;
54 __skb_pull(skb, hdr_len);
55 memmove(ipv6_hdr(skb), iph, hdr_len);
57 x->lastused = get_seconds();
59 return 0;
62 static struct xfrm_mode xfrm6_ro_mode = {
63 .output = xfrm6_ro_output,
64 .owner = THIS_MODULE,
65 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
68 static int __init xfrm6_ro_init(void)
70 return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
73 static void __exit xfrm6_ro_exit(void)
75 int err;
77 err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
78 BUG_ON(err);
81 module_init(xfrm6_ro_init);
82 module_exit(xfrm6_ro_exit);
83 MODULE_LICENSE("GPL");
84 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);