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- /*
- * xfrm6_mode_ro.c - Route optimization mode for IPv6.
- *
- * Copyright (C)2003-2006 Helsinki University of Technology
- * Copyright (C)2003-2006 USAGI/WIDE Project
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- */
- /*
- * Authors:
- * Noriaki TAKAMIYA @USAGI
- * Masahide NAKAMURA @USAGI
- */
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/spinlock.h>
- #include <linux/stringify.h>
- #include <linux/time.h>
- #include <net/ipv6.h>
- #include <net/xfrm.h>
- /* Add route optimization header space.
- *
- * The IP header and mutable extension headers will be moved forward to make
- * space for the route optimization header.
- */
- static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
- {
- struct ipv6hdr *iph;
- u8 *prevhdr;
- int hdr_len;
- iph = ipv6_hdr(skb);
- hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
- skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
- skb_set_network_header(skb, -x->props.header_len);
- skb->transport_header = skb->network_header + hdr_len;
- __skb_pull(skb, hdr_len);
- memmove(ipv6_hdr(skb), iph, hdr_len);
- x->lastused = get_seconds();
- return 0;
- }
- static struct xfrm_mode xfrm6_ro_mode = {
- .output = xfrm6_ro_output,
- .owner = THIS_MODULE,
- .encap = XFRM_MODE_ROUTEOPTIMIZATION,
- };
- static int __init xfrm6_ro_init(void)
- {
- return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
- }
- static void __exit xfrm6_ro_exit(void)
- {
- int err;
- err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
- BUG_ON(err);
- }
- module_init(xfrm6_ro_init);
- module_exit(xfrm6_ro_exit);
- MODULE_LICENSE("GPL");
- MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);
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