[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
David S. Miller
parent
27637df92e
commit
2c8d7ca0f7
4 changed files with 223 additions and 0 deletions
31
include/net/mip6.h
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31
include/net/mip6.h
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@ -0,0 +1,31 @@
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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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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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* YOSHIFUJI Hideaki @USAGI
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*/
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#ifndef _NET_MIP6_H
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#define _NET_MIP6_H
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extern int mip6_init(void);
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extern void mip6_fini(void);
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#endif
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@ -14,6 +14,8 @@ ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
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xfrm6_output.o
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ipv6-$(CONFIG_NETFILTER) += netfilter.o
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ipv6-$(CONFIG_IPV6_MULTIPLE_TABLES) += fib6_rules.o
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ipv6-$(CONFIG_IPV6_MIP6) += mip6.o
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ipv6-objs += $(ipv6-y)
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obj-$(CONFIG_INET6_AH) += ah6.o
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@ -59,6 +59,9 @@
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#ifdef CONFIG_IPV6_TUNNEL
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#include <net/ip6_tunnel.h>
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#endif
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#ifdef CONFIG_IPV6_MIP6
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#include <net/mip6.h>
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#endif
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#include <asm/uaccess.h>
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#include <asm/system.h>
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@ -857,6 +860,9 @@ static int __init inet6_init(void)
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ipv6_frag_init();
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ipv6_nodata_init();
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ipv6_destopt_init();
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#ifdef CONFIG_IPV6_MIP6
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mip6_init();
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#endif
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/* Init v6 transport protocols. */
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udpv6_init();
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@ -919,6 +925,9 @@ static void __exit inet6_exit(void)
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udp6_proc_exit();
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tcp6_proc_exit();
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raw6_proc_exit();
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#endif
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#ifdef CONFIG_IPV6_MIP6
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mip6_fini();
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#endif
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/* Cleanup code parts. */
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sit_cleanup();
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181
net/ipv6/mip6.c
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181
net/ipv6/mip6.c
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@ -0,0 +1,181 @@
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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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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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/config.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ipv6.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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#include <net/mip6.h>
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static xfrm_address_t *mip6_xfrm_addr(struct xfrm_state *x, xfrm_address_t *addr)
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{
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return x->coaddr;
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}
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static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data;
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if (!ipv6_addr_equal(&rt2->addr, (struct in6_addr *)x->coaddr) &&
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!ipv6_addr_any((struct in6_addr *)x->coaddr))
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return -ENOENT;
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return rt2->rt_hdr.nexthdr;
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}
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/* Routing Header type 2 is inserted.
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* IP Header's dst address is replaced with Routing Header's Home Address.
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*/
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static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *iph;
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struct rt2_hdr *rt2;
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u8 nexthdr;
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iph = (struct ipv6hdr *)skb->data;
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iph->payload_len = htons(skb->len - sizeof(*iph));
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nexthdr = *skb->nh.raw;
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*skb->nh.raw = IPPROTO_ROUTING;
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rt2 = (struct rt2_hdr *)skb->h.raw;
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rt2->rt_hdr.nexthdr = nexthdr;
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rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
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rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
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rt2->rt_hdr.segments_left = 1;
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memset(&rt2->reserved, 0, sizeof(rt2->reserved));
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BUG_TRAP(rt2->rt_hdr.hdrlen == 2);
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memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
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memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
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return 0;
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}
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static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
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u8 **nexthdr)
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{
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u16 offset = sizeof(struct ipv6hdr);
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struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
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unsigned int packet_len = skb->tail - skb->nh.raw;
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int found_rhdr = 0;
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*nexthdr = &skb->nh.ipv6h->nexthdr;
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while (offset + 1 <= packet_len) {
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switch (**nexthdr) {
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case NEXTHDR_HOP:
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break;
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case NEXTHDR_ROUTING:
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if (offset + 3 <= packet_len) {
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struct ipv6_rt_hdr *rt;
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rt = (struct ipv6_rt_hdr *)(skb->nh.raw + offset);
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if (rt->type != 0)
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return offset;
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}
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found_rhdr = 1;
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break;
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case NEXTHDR_DEST:
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if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
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return offset;
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if (found_rhdr)
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return offset;
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break;
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default:
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return offset;
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}
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offset += ipv6_optlen(exthdr);
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*nexthdr = &exthdr->nexthdr;
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exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
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}
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return offset;
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}
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static int mip6_rthdr_init_state(struct xfrm_state *x)
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{
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if (x->id.spi) {
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printk(KERN_INFO "%s: spi is not 0: %u\n", __FUNCTION__,
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x->id.spi);
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return -EINVAL;
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}
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if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
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printk(KERN_INFO "%s: state's mode is not %u: %u\n",
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__FUNCTION__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
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return -EINVAL;
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}
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x->props.header_len = sizeof(struct rt2_hdr);
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return 0;
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}
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/*
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* Do nothing about destroying since it has no specific operation for routing
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* header type 2 unlike IPsec protocols.
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*/
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static void mip6_rthdr_destroy(struct xfrm_state *x)
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{
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}
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static struct xfrm_type mip6_rthdr_type =
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{
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.description = "MIP6RT",
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.owner = THIS_MODULE,
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.proto = IPPROTO_ROUTING,
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.flags = XFRM_TYPE_NON_FRAGMENT,
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.init_state = mip6_rthdr_init_state,
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.destructor = mip6_rthdr_destroy,
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.input = mip6_rthdr_input,
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.output = mip6_rthdr_output,
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.hdr_offset = mip6_rthdr_offset,
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.remote_addr = mip6_xfrm_addr,
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};
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int __init mip6_init(void)
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{
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printk(KERN_INFO "Mobile IPv6\n");
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if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
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printk(KERN_INFO "%s: can't add xfrm type(rthdr)\n", __FUNCTION__);
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goto mip6_rthdr_xfrm_fail;
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}
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return 0;
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mip6_rthdr_xfrm_fail:
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return -EAGAIN;
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}
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void __exit mip6_fini(void)
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{
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if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
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printk(KERN_INFO "%s: can't remove xfrm type(rthdr)\n", __FUNCTION__);
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}
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