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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, see <http://www.gnu.org/licenses/>.
 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>
 30 #include <linux/spinlock.h>
 31 #include <linux/stringify.h>
 32 #include <linux/time.h>
 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.
 40  */
 41 static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
 42 {
 43         struct ipv6hdr *iph;
 44         u8 *prevhdr;
 45         int hdr_len;
 46 
 47         iph = ipv6_hdr(skb);
 48 
 49         hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
 50         if (hdr_len < 0)
 51                 return hdr_len;
 52         skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
 53         skb_set_network_header(skb, -x->props.header_len);
 54         skb->transport_header = skb->network_header + hdr_len;
 55         __skb_pull(skb, hdr_len);
 56         memmove(ipv6_hdr(skb), iph, hdr_len);
 57 
 58         x->lastused = get_seconds();
 59 
 60         return 0;
 61 }
 62 
 63 static struct xfrm_mode xfrm6_ro_mode = {
 64         .output = xfrm6_ro_output,
 65         .owner = THIS_MODULE,
 66         .encap = XFRM_MODE_ROUTEOPTIMIZATION,
 67 };
 68 
 69 static int __init xfrm6_ro_init(void)
 70 {
 71         return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
 72 }
 73 
 74 static void __exit xfrm6_ro_exit(void)
 75 {
 76         int err;
 77 
 78         err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
 79         BUG_ON(err);
 80 }
 81 
 82 module_init(xfrm6_ro_init);
 83 module_exit(xfrm6_ro_exit);
 84 MODULE_LICENSE("GPL");
 85 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);
 86 

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