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95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
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/*
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* xfrm6_mode_ro.c - Route optimization mode for IPv6.
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*
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* Copyright (C)2003-2006 Helsinki University of Technology
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* Copyright (C)2003-2006 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Authors:
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* Noriaki TAKAMIYA @USAGI
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* Masahide NAKAMURA @USAGI
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/stringify.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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/* Add route optimization header space.
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*
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* The IP header and mutable extension headers will be moved forward to make
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* space for the route optimization header.
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*
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* On exit, skb->h will be set to the start of the encapsulation header to be
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* filled in by x->type->output and skb->nh will be set to the nextheader field
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* of the extension header directly preceding the encapsulation header, or in
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* its absence, that of the top IP header. The value of skb->data will always
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* point to the top IP header.
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*/
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static int xfrm6_ro_output(struct sk_buff *skb)
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{
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struct xfrm_state *x = skb->dst->xfrm;
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struct ipv6hdr *iph;
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u8 *prevhdr;
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int hdr_len;
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skb_push(skb, x->props.header_len);
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iph = skb->nh.ipv6h;
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hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
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skb->nh.raw = prevhdr - x->props.header_len;
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skb->h.raw = skb->data + hdr_len;
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memmove(skb->data, iph, hdr_len);
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return 0;
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}
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/*
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* Do nothing about routing optimization header unlike IPsec.
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*/
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static int xfrm6_ro_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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return 0;
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}
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static struct xfrm_mode xfrm6_ro_mode = {
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.input = xfrm6_ro_input,
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.output = xfrm6_ro_output,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_ROUTEOPTIMIZATION,
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};
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static int __init xfrm6_ro_init(void)
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{
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return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
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}
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static void __exit xfrm6_ro_exit(void)
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{
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int err;
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err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
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BUG_ON(err);
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}
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module_init(xfrm6_ro_init);
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module_exit(xfrm6_ro_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);
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