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Linux/net/ipv6/xfrm6_mode_ro.c

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  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/spinlock.h>
 32 #include <linux/stringify.h>
 33 #include <linux/time.h>
 34 #include <net/ipv6.h>
 35 #include <net/xfrm.h>
 36 
 37 /* Add route optimization header space.
 38  *
 39  * The IP header and mutable extension headers will be moved forward to make
 40  * space for the route optimization header.
 41  */
 42 static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
 43 {
 44         struct ipv6hdr *iph;
 45         u8 *prevhdr;
 46         int hdr_len;
 47 
 48         iph = ipv6_hdr(skb);
 49 
 50         hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
 51         skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
 52         skb_set_network_header(skb, -x->props.header_len);
 53         skb->transport_header = skb->network_header + hdr_len;
 54         __skb_pull(skb, hdr_len);
 55         memmove(ipv6_hdr(skb), iph, hdr_len);
 56 
 57         x->lastused = get_seconds();
 58 
 59         return 0;
 60 }
 61 
 62 static struct xfrm_mode xfrm6_ro_mode = {
 63         .output = xfrm6_ro_output,
 64         .owner = THIS_MODULE,
 65         .encap = XFRM_MODE_ROUTEOPTIMIZATION,
 66 };
 67 
 68 static int __init xfrm6_ro_init(void)
 69 {
 70         return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
 71 }
 72 
 73 static void __exit xfrm6_ro_exit(void)
 74 {
 75         int err;
 76 
 77         err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
 78         BUG_ON(err);
 79 }
 80 
 81 module_init(xfrm6_ro_init);
 82 module_exit(xfrm6_ro_exit);
 83 MODULE_LICENSE("GPL");
 84 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);
 85 

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