2024-09-09 08:52:07 +00:00
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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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2024-09-09 08:57:42 +00:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2024-09-09 08:52:07 +00:00
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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/spinlock.h>
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#include <linux/stringify.h>
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#include <linux/time.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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static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *iph;
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u8 *prevhdr;
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int hdr_len;
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iph = ipv6_hdr(skb);
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hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
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skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
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skb_set_network_header(skb, -x->props.header_len);
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skb->transport_header = skb->network_header + hdr_len;
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__skb_pull(skb, hdr_len);
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memmove(ipv6_hdr(skb), iph, hdr_len);
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x->lastused = get_seconds();
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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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.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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