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[IPV6] MIP6: Add routing header type 2 transformation. 

Add routing header type 2 transformation for Mobile IPv6.
Based on MIPL2 kernel patch.

Signed-off-by: Noriaki TAKAMIYA <takamiya@po.ntts.co.jp>
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Noriaki TAKAMIYA 2006-08-23 20:31:11 -07:00 committed by David S. Miller
parent 27637df92e
commit 2c8d7ca0f7
4 changed files with 223 additions and 0 deletions
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31
include/net/mip6.h Normal file
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@ -0,0 +1,31 @@
/*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Authors:
* Noriaki TAKAMIYA @USAGI
* Masahide NAKAMURA @USAGI
* YOSHIFUJI Hideaki @USAGI
*/
#ifndef _NET_MIP6_H
#define _NET_MIP6_H
extern int mip6_init(void);
extern void mip6_fini(void);
#endif

2
net/ipv6/Makefile
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@ -14,6 +14,8 @@ ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
xfrm6_output.o
ipv6-$(CONFIG_NETFILTER) += netfilter.o
ipv6-$(CONFIG_IPV6_MULTIPLE_TABLES) += fib6_rules.o
ipv6-$(CONFIG_IPV6_MIP6) += mip6.o
ipv6-objs += $(ipv6-y)
obj-$(CONFIG_INET6_AH) += ah6.o

9
net/ipv6/af_inet6.c
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@ -59,6 +59,9 @@
#ifdef CONFIG_IPV6_TUNNEL
#include <net/ip6_tunnel.h>
#endif
#ifdef CONFIG_IPV6_MIP6
#include <net/mip6.h>
#endif
#include <asm/uaccess.h>
#include <asm/system.h>
@ -857,6 +860,9 @@ static int __init inet6_init(void)
ipv6_frag_init();
ipv6_nodata_init();
ipv6_destopt_init();
#ifdef CONFIG_IPV6_MIP6
mip6_init();
#endif
/* Init v6 transport protocols. */
udpv6_init();
@ -919,6 +925,9 @@ static void __exit inet6_exit(void)
udp6_proc_exit();
tcp6_proc_exit();
raw6_proc_exit();
#endif
#ifdef CONFIG_IPV6_MIP6
mip6_fini();
#endif
/* Cleanup code parts. */
sit_cleanup();

181
net/ipv6/mip6.c Normal file
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@ -0,0 +1,181 @@
/*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Authors:
* Noriaki TAKAMIYA @USAGI
* Masahide NAKAMURA @USAGI
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ipv6.h>
#include <net/ipv6.h>
#include <net/xfrm.h>
#include <net/mip6.h>
static xfrm_address_t *mip6_xfrm_addr(struct xfrm_state *x, xfrm_address_t *addr)
{
return x->coaddr;
}
static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
{
struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data;
if (!ipv6_addr_equal(&rt2->addr, (struct in6_addr *)x->coaddr) &&
!ipv6_addr_any((struct in6_addr *)x->coaddr))
return -ENOENT;
return rt2->rt_hdr.nexthdr;
}
/* Routing Header type 2 is inserted.
* IP Header's dst address is replaced with Routing Header's Home Address.
*/
static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
{
struct ipv6hdr *iph;
struct rt2_hdr *rt2;
u8 nexthdr;
iph = (struct ipv6hdr *)skb->data;
iph->payload_len = htons(skb->len - sizeof(*iph));
nexthdr = *skb->nh.raw;
*skb->nh.raw = IPPROTO_ROUTING;
rt2 = (struct rt2_hdr *)skb->h.raw;
rt2->rt_hdr.nexthdr = nexthdr;
rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
rt2->rt_hdr.segments_left = 1;
memset(&rt2->reserved, 0, sizeof(rt2->reserved));
BUG_TRAP(rt2->rt_hdr.hdrlen == 2);
memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
return 0;
}
static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
u8 **nexthdr)
{
u16 offset = sizeof(struct ipv6hdr);
struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
unsigned int packet_len = skb->tail - skb->nh.raw;
int found_rhdr = 0;
*nexthdr = &skb->nh.ipv6h->nexthdr;
while (offset + 1 <= packet_len) {
switch (**nexthdr) {
case NEXTHDR_HOP:
break;
case NEXTHDR_ROUTING:
if (offset + 3 <= packet_len) {
struct ipv6_rt_hdr *rt;
rt = (struct ipv6_rt_hdr *)(skb->nh.raw + offset);
if (rt->type != 0)
return offset;
}
found_rhdr = 1;
break;
case NEXTHDR_DEST:
if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
return offset;
if (found_rhdr)
return offset;
break;
default:
return offset;
}
offset += ipv6_optlen(exthdr);
*nexthdr = &exthdr->nexthdr;
exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
}
return offset;
}
static int mip6_rthdr_init_state(struct xfrm_state *x)
{
if (x->id.spi) {
printk(KERN_INFO "%s: spi is not 0: %u\n", __FUNCTION__,
x->id.spi);
return -EINVAL;
}
if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
printk(KERN_INFO "%s: state's mode is not %u: %u\n",
__FUNCTION__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
return -EINVAL;
}
x->props.header_len = sizeof(struct rt2_hdr);
return 0;
}
/*
* Do nothing about destroying since it has no specific operation for routing
* header type 2 unlike IPsec protocols.
*/
static void mip6_rthdr_destroy(struct xfrm_state *x)
{
}
static struct xfrm_type mip6_rthdr_type =
{
.description = "MIP6RT",
.owner = THIS_MODULE,
.proto = IPPROTO_ROUTING,
.flags = XFRM_TYPE_NON_FRAGMENT,
.init_state = mip6_rthdr_init_state,
.destructor = mip6_rthdr_destroy,
.input = mip6_rthdr_input,
.output = mip6_rthdr_output,
.hdr_offset = mip6_rthdr_offset,
.remote_addr = mip6_xfrm_addr,
};
int __init mip6_init(void)
{
printk(KERN_INFO "Mobile IPv6\n");
if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
printk(KERN_INFO "%s: can't add xfrm type(rthdr)\n", __FUNCTION__);
goto mip6_rthdr_xfrm_fail;
}
return 0;
mip6_rthdr_xfrm_fail:
return -EAGAIN;
}
void __exit mip6_fini(void)
{
if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
printk(KERN_INFO "%s: can't remove xfrm type(rthdr)\n", __FUNCTION__);
}