Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 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> |
Herbert Xu | 45b17f4 | 2007-10-08 17:27:19 -0700 | [diff] [blame^] | 32 | #include <linux/time.h> |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 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 |
| 42 | * filled in by x->type->output and skb->nh will be set to the nextheader field |
| 43 | * of the extension header directly preceding the encapsulation header, or in |
| 44 | * its absence, that of the top IP header. The value of skb->data will always |
| 45 | * point to the top IP header. |
| 46 | */ |
Jamal Hadi Salim | eb878e8 | 2006-08-31 17:42:59 -0700 | [diff] [blame] | 47 | static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb) |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 48 | { |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 49 | struct ipv6hdr *iph; |
| 50 | u8 *prevhdr; |
| 51 | int hdr_len; |
| 52 | |
| 53 | skb_push(skb, x->props.header_len); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 54 | iph = ipv6_hdr(skb); |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 55 | |
| 56 | hdr_len = x->type->hdr_offset(x, skb, &prevhdr); |
Arnaldo Carvalho de Melo | ddc7b8e | 2007-03-15 21:42:27 -0300 | [diff] [blame] | 57 | skb_set_network_header(skb, |
| 58 | (prevhdr - x->props.header_len) - skb->data); |
Arnaldo Carvalho de Melo | 967b05f | 2007-03-13 13:51:52 -0300 | [diff] [blame] | 59 | skb_set_transport_header(skb, hdr_len); |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 60 | memmove(skb->data, iph, hdr_len); |
Herbert Xu | 45b17f4 | 2007-10-08 17:27:19 -0700 | [diff] [blame^] | 61 | |
| 62 | x->lastused = get_seconds(); |
| 63 | |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | /* |
| 68 | * Do nothing about routing optimization header unlike IPsec. |
| 69 | */ |
| 70 | static int xfrm6_ro_input(struct xfrm_state *x, struct sk_buff *skb) |
| 71 | { |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static struct xfrm_mode xfrm6_ro_mode = { |
| 76 | .input = xfrm6_ro_input, |
| 77 | .output = xfrm6_ro_output, |
| 78 | .owner = THIS_MODULE, |
| 79 | .encap = XFRM_MODE_ROUTEOPTIMIZATION, |
| 80 | }; |
| 81 | |
| 82 | static int __init xfrm6_ro_init(void) |
| 83 | { |
| 84 | return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6); |
| 85 | } |
| 86 | |
| 87 | static void __exit xfrm6_ro_exit(void) |
| 88 | { |
| 89 | int err; |
| 90 | |
| 91 | err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6); |
| 92 | BUG_ON(err); |
| 93 | } |
| 94 | |
| 95 | module_init(xfrm6_ro_init); |
| 96 | module_exit(xfrm6_ro_exit); |
| 97 | MODULE_LICENSE("GPL"); |
| 98 | MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION); |