diff options
| -rw-r--r-- | net/ipv6/Kconfig | 7 | ||||
| -rw-r--r-- | net/ipv6/Makefile | 1 | ||||
| -rw-r--r-- | net/ipv6/xfrm6_mode_ro.c | 94 |
3 files changed, 102 insertions, 0 deletions
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig index 14f0b336519f..1188d9560242 100644 --- a/net/ipv6/Kconfig +++ b/net/ipv6/Kconfig @@ -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 diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile index 9eebf6091279..87e912e31922 100644 --- a/net/ipv6/Makefile +++ b/net/ipv6/Makefile @@ -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 diff --git a/net/ipv6/xfrm6_mode_ro.c b/net/ipv6/xfrm6_mode_ro.c new file mode 100644 index 000000000000..c11c335312f9 --- /dev/null +++ b/net/ipv6/xfrm6_mode_ro.c @@ -0,0 +1,94 @@ +/* + * 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); |