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 |
Jeff Kirsher | a99421d | 2013-12-06 09:13:39 -0800 | [diff] [blame^] | 18 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 19 | */ |
| 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 Xu | a2deb6d2 | 2007-11-13 21:39:38 -0800 | [diff] [blame] | 30 | #include <linux/spinlock.h> |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 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. |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 40 | */ |
Jamal Hadi Salim | eb878e8 | 2006-08-31 17:42:59 -0700 | [diff] [blame] | 41 | 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] | 42 | { |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 43 | struct ipv6hdr *iph; |
| 44 | u8 *prevhdr; |
| 45 | int hdr_len; |
| 46 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 47 | iph = ipv6_hdr(skb); |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 48 | |
| 49 | hdr_len = x->type->hdr_offset(x, skb, &prevhdr); |
Herbert Xu | 007f021 | 2007-10-09 13:25:59 -0700 | [diff] [blame] | 50 | skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data); |
Herbert Xu | 7b277b1 | 2007-10-10 15:44:06 -0700 | [diff] [blame] | 51 | skb_set_network_header(skb, -x->props.header_len); |
Herbert Xu | 37fedd3 | 2007-10-10 15:44:44 -0700 | [diff] [blame] | 52 | skb->transport_header = skb->network_header + hdr_len; |
Herbert Xu | 7b277b1 | 2007-10-10 15:44:06 -0700 | [diff] [blame] | 53 | __skb_pull(skb, hdr_len); |
| 54 | memmove(ipv6_hdr(skb), iph, hdr_len); |
Herbert Xu | 45b17f4 | 2007-10-08 17:27:19 -0700 | [diff] [blame] | 55 | |
| 56 | x->lastused = get_seconds(); |
| 57 | |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 58 | return 0; |
| 59 | } |
| 60 | |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 61 | static struct xfrm_mode xfrm6_ro_mode = { |
Masahide NAKAMURA | 1d71627 | 2006-08-23 17:59:44 -0700 | [diff] [blame] | 62 | .output = xfrm6_ro_output, |
| 63 | .owner = THIS_MODULE, |
| 64 | .encap = XFRM_MODE_ROUTEOPTIMIZATION, |
| 65 | }; |
| 66 | |
| 67 | static int __init xfrm6_ro_init(void) |
| 68 | { |
| 69 | return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6); |
| 70 | } |
| 71 | |
| 72 | static 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 | |
| 80 | module_init(xfrm6_ro_init); |
| 81 | module_exit(xfrm6_ro_exit); |
| 82 | MODULE_LICENSE("GPL"); |
| 83 | MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION); |