[XFRM] STATE: Introduce route optimization mode. (1d71627d) · Commits · 戴 / test

net/ipv6/Kconfig

+7 −0

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		@@ -127,6 +127,13 @@ config INET6_XFRM_MODE_TUNNEL

		If unsure, say Y.

		config INET6_XFRM_MODE_ROUTEOPTIMIZATION
		tristate "IPv6: MIPv6 route optimization mode (EXPERIMENTAL)"
		depends on IPV6 && EXPERIMENTAL
		select XFRM
		---help---
		Support for MIPv6 route optimization mode.

		config IPV6_TUNNEL
		tristate "IPv6: IPv6-in-IPv6 tunnel"
		select INET6_TUNNEL

net/ipv6/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@ obj-$(CONFIG_INET6_XFRM_TUNNEL) += xfrm6_tunnel.o
		obj-$(CONFIG_INET6_TUNNEL) += tunnel6.o
		obj-$(CONFIG_INET6_XFRM_MODE_TRANSPORT) += xfrm6_mode_transport.o
		obj-$(CONFIG_INET6_XFRM_MODE_TUNNEL) += xfrm6_mode_tunnel.o
		obj-$(CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION) += xfrm6_mode_ro.o
		obj-$(CONFIG_NETFILTER) += netfilter/

		obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o

net/ipv6/xfrm6_mode_ro.c

0 → 100644

+94 −0

Original line number	Diff line number	Diff line
		/*
		* 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, 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/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/skbuff.h>
		#include <linux/stringify.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.
		*
		* On exit, skb->h will be set to the start of the encapsulation header to be
		* filled in by x->type->output and skb->nh will be set to the nextheader field
		* of the extension header directly preceding the encapsulation header, or in
		* its absence, that of the top IP header. The value of skb->data will always
		* point to the top IP header.
		*/
		static int xfrm6_ro_output(struct sk_buff *skb)
		{
		struct xfrm_state *x = skb->dst->xfrm;
		struct ipv6hdr *iph;
		u8 *prevhdr;
		int hdr_len;

		skb_push(skb, x->props.header_len);
		iph = skb->nh.ipv6h;

		hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
		skb->nh.raw = prevhdr - x->props.header_len;
		skb->h.raw = skb->data + hdr_len;
		memmove(skb->data, iph, hdr_len);
		return 0;
		}

		/*
		* Do nothing about routing optimization header unlike IPsec.
		*/
		static int xfrm6_ro_input(struct xfrm_state x, struct sk_buff skb)
		{
		return 0;
		}

		static struct xfrm_mode xfrm6_ro_mode = {
		.input = xfrm6_ro_input,
		.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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