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1d71627d MN |
1 | /* |
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> | |
a2deb6d2 | 31 | #include <linux/spinlock.h> |
1d71627d | 32 | #include <linux/stringify.h> |
45b17f48 | 33 | #include <linux/time.h> |
1d71627d MN |
34 | #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. | |
1d71627d | 41 | */ |
eb878e84 | 42 | static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb) |
1d71627d | 43 | { |
1d71627d MN |
44 | struct ipv6hdr *iph; |
45 | u8 *prevhdr; | |
46 | int hdr_len; | |
47 | ||
0660e03f | 48 | iph = ipv6_hdr(skb); |
1d71627d MN |
49 | |
50 | hdr_len = x->type->hdr_offset(x, skb, &prevhdr); | |
007f0211 | 51 | skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data); |
7b277b1a | 52 | skb_set_network_header(skb, -x->props.header_len); |
37fedd3a | 53 | skb->transport_header = skb->network_header + hdr_len; |
7b277b1a HX |
54 | __skb_pull(skb, hdr_len); |
55 | memmove(ipv6_hdr(skb), iph, hdr_len); | |
45b17f48 HX |
56 | |
57 | x->lastused = get_seconds(); | |
58 | ||
1d71627d MN |
59 | return 0; |
60 | } | |
61 | ||
1d71627d | 62 | static struct xfrm_mode xfrm6_ro_mode = { |
1d71627d MN |
63 | .output = xfrm6_ro_output, |
64 | .owner = THIS_MODULE, | |
65 | .encap = XFRM_MODE_ROUTEOPTIMIZATION, | |
66 | }; | |
67 | ||
68 | static int __init xfrm6_ro_init(void) | |
69 | { | |
70 | return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6); | |
71 | } | |
72 | ||
73 | static 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 | ||
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); |