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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> | |
31 | #include <linux/stringify.h> | |
45b17f48 | 32 | #include <linux/time.h> |
1d71627d MN |
33 | #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. | |
40 | * | |
41 | * On exit, skb->h will be set to the start of the encapsulation header to be | |
007f0211 HX |
42 | * filled in by x->type->output and the mac header will be set to the |
43 | * nextheader field of the extension header directly preceding the | |
44 | * encapsulation header, or in its absence, that of the top IP header. | |
45 | * The value of skb->data and the network header will always point to the | |
46 | * top IP header. | |
1d71627d | 47 | */ |
eb878e84 | 48 | static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb) |
1d71627d | 49 | { |
1d71627d MN |
50 | struct ipv6hdr *iph; |
51 | u8 *prevhdr; | |
52 | int hdr_len; | |
53 | ||
54 | skb_push(skb, x->props.header_len); | |
0660e03f | 55 | iph = ipv6_hdr(skb); |
1d71627d MN |
56 | |
57 | hdr_len = x->type->hdr_offset(x, skb, &prevhdr); | |
007f0211 HX |
58 | skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data); |
59 | skb_reset_network_header(skb); | |
967b05f6 | 60 | skb_set_transport_header(skb, hdr_len); |
1d71627d | 61 | memmove(skb->data, iph, hdr_len); |
45b17f48 HX |
62 | |
63 | x->lastused = get_seconds(); | |
64 | ||
1d71627d MN |
65 | return 0; |
66 | } | |
67 | ||
68 | /* | |
69 | * Do nothing about routing optimization header unlike IPsec. | |
70 | */ | |
71 | static int xfrm6_ro_input(struct xfrm_state *x, struct sk_buff *skb) | |
72 | { | |
73 | return 0; | |
74 | } | |
75 | ||
76 | static struct xfrm_mode xfrm6_ro_mode = { | |
77 | .input = xfrm6_ro_input, | |
78 | .output = xfrm6_ro_output, | |
79 | .owner = THIS_MODULE, | |
80 | .encap = XFRM_MODE_ROUTEOPTIMIZATION, | |
81 | }; | |
82 | ||
83 | static int __init xfrm6_ro_init(void) | |
84 | { | |
85 | return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6); | |
86 | } | |
87 | ||
88 | static void __exit xfrm6_ro_exit(void) | |
89 | { | |
90 | int err; | |
91 | ||
92 | err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6); | |
93 | BUG_ON(err); | |
94 | } | |
95 | ||
96 | module_init(xfrm6_ro_init); | |
97 | module_exit(xfrm6_ro_exit); | |
98 | MODULE_LICENSE("GPL"); | |
99 | MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION); |