[linux-2.6-block.git] / net / ipv6 / mip6.c

/*
 * 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 inline unsigned int calc_padlen(unsigned int len, unsigned int n)
{
	return (n - len + 16) & 0x7;
}

static inline void *mip6_padn(__u8 *data, __u8 padlen)
{
	if (!data)
		return NULL;
	if (padlen == 1) {
		data[0] = MIP6_OPT_PAD_1;
	} else if (padlen > 1) {
		data[0] = MIP6_OPT_PAD_N;
		data[1] = padlen - 2;
		if (padlen > 2)
			memset(data+2, 0, data[1]);
	}
	return data + padlen;
}

static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
{
	struct ipv6hdr *iph = skb->nh.ipv6h;
	struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;

	if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
	    !ipv6_addr_any((struct in6_addr *)x->coaddr))
		return -ENOENT;

	return destopt->nexthdr;
}

/* Destination Option Header is inserted.
 * IP Header's src address is replaced with Home Address Option in
 * Destination Option Header.
 */
static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
{
	struct ipv6hdr *iph;
	struct ipv6_destopt_hdr *dstopt;
	struct ipv6_destopt_hao *hao;
	u8 nexthdr;
	int len;

	iph = (struct ipv6hdr *)skb->data;
	iph->payload_len = htons(skb->len - sizeof(*iph));

	nexthdr = *skb->nh.raw;
	*skb->nh.raw = IPPROTO_DSTOPTS;

	dstopt = (struct ipv6_destopt_hdr *)skb->h.raw;
	dstopt->nexthdr = nexthdr;

	hao = mip6_padn((char *)(dstopt + 1),
			calc_padlen(sizeof(*dstopt), 6));

	hao->type = IPV6_TLV_HAO;
	hao->length = sizeof(*hao) - 2;
	BUG_TRAP(hao->length == 16);

	len = ((char *)hao - (char *)dstopt) + sizeof(*hao);

	memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
	memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));

	BUG_TRAP(len == x->props.header_len);
	dstopt->hdrlen = (x->props.header_len >> 3) - 1;

	return 0;
}

static int mip6_destopt_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:
			found_rhdr = 1;
			break;
		case NEXTHDR_DEST:
			/*
			 * HAO MUST NOT appear more than once.
			 * XXX: It is better to try to find by the end of
			 * XXX: packet if HAO exists.
			 */
			if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
				LIMIT_NETDEBUG(KERN_WARNING "mip6: hao exists already, override\n");
				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_destopt_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 ipv6_destopt_hdr) +
		calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) +
		sizeof(struct ipv6_destopt_hao);
	BUG_TRAP(x->props.header_len == 24);

	return 0;
}

/*
 * Do nothing about destroying since it has no specific operation for
 * destination options header unlike IPsec protocols.
 */
static void mip6_destopt_destroy(struct xfrm_state *x)
{
}

static struct xfrm_type mip6_destopt_type =
{
	.description	= "MIP6DESTOPT",
	.owner		= THIS_MODULE,
	.proto	     	= IPPROTO_DSTOPTS,
	.flags		= XFRM_TYPE_NON_FRAGMENT,
	.init_state	= mip6_destopt_init_state,
	.destructor	= mip6_destopt_destroy,
	.input		= mip6_destopt_input,
	.output		= mip6_destopt_output,
	.hdr_offset	= mip6_destopt_offset,
	.local_addr	= mip6_xfrm_addr,
};

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_destopt_type, AF_INET6) < 0) {
		printk(KERN_INFO "%s: can't add xfrm type(destopt)\n", __FUNCTION__);
		goto mip6_destopt_xfrm_fail;
	}
	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:
	xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
 mip6_destopt_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__);
	if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
		printk(KERN_INFO "%s: can't remove xfrm type(destopt)\n", __FUNCTION__);
}
Commit	Line	Data
2c8d7ca0 NT	1	/*
	2	* Copyright (C)2003-2006 Helsinki University of Technology
	3	* Copyright (C)2003-2006 USAGI/WIDE Project
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19	/*
	20	* Authors:
	21	* Noriaki TAKAMIYA @USAGI
	22	* Masahide NAKAMURA @USAGI
	23	*/
	24
	25	#include <linux/config.h>
	26	#include <linux/module.h>
	27	#include <linux/skbuff.h>
	28	#include <linux/ipv6.h>
	29	#include <net/ipv6.h>
	30	#include <net/xfrm.h>
	31	#include <net/mip6.h>
	32
	33	static xfrm_address_t mip6_xfrm_addr(struct xfrm_state x, xfrm_address_t *addr)
	34	{
	35	return x->coaddr;
	36	}
	37
3d126890 NT	38	static inline unsigned int calc_padlen(unsigned int len, unsigned int n)
	39	{
	40	return (n - len + 16) & 0x7;
	41	}
	42
	43	static inline void mip6_padn(__u8 data, __u8 padlen)
	44	{
	45	if (!data)
	46	return NULL;
	47	if (padlen == 1) {
	48	data[0] = MIP6_OPT_PAD_1;
	49	} else if (padlen > 1) {
	50	data[0] = MIP6_OPT_PAD_N;
	51	data[1] = padlen - 2;
	52	if (padlen > 2)
	53	memset(data+2, 0, data[1]);
	54	}
	55	return data + padlen;
	56	}
	57
	58	static int mip6_destopt_input(struct xfrm_state x, struct sk_buff skb)
	59	{
	60	struct ipv6hdr *iph = skb->nh.ipv6h;
	61	struct ipv6_destopt_hdr destopt = (struct ipv6_destopt_hdr )skb->data;
	62
	63	if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
	64	!ipv6_addr_any((struct in6_addr *)x->coaddr))
	65	return -ENOENT;
	66
	67	return destopt->nexthdr;
	68	}
	69
	70	/* Destination Option Header is inserted.
	71	* IP Header's src address is replaced with Home Address Option in
	72	* Destination Option Header.
	73	*/
	74	static int mip6_destopt_output(struct xfrm_state x, struct sk_buff skb)
	75	{
	76	struct ipv6hdr *iph;
	77	struct ipv6_destopt_hdr *dstopt;
	78	struct ipv6_destopt_hao *hao;
	79	u8 nexthdr;
	80	int len;
	81
	82	iph = (struct ipv6hdr *)skb->data;
	83	iph->payload_len = htons(skb->len - sizeof(*iph));
	84
	85	nexthdr = *skb->nh.raw;
	86	*skb->nh.raw = IPPROTO_DSTOPTS;
	87
	88	dstopt = (struct ipv6_destopt_hdr *)skb->h.raw;
	89	dstopt->nexthdr = nexthdr;
	90
	91	hao = mip6_padn((char *)(dstopt + 1),
	92	calc_padlen(sizeof(*dstopt), 6));
	93
	94	hao->type = IPV6_TLV_HAO;
	95	hao->length = sizeof(*hao) - 2;
	96	BUG_TRAP(hao->length == 16);
	97
	98	len = ((char )hao - (char )dstopt) + sizeof(*hao);
	99
	100	memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
	101	memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));
102
103	BUG_TRAP(len == x->props.header_len);
104	dstopt->hdrlen = (x->props.header_len >> 3) - 1;
105
106	return 0;
107	}
108
109	static int mip6_destopt_offset(struct xfrm_state x, struct sk_buff skb,
110	u8 **nexthdr)
111	{
112	u16 offset = sizeof(struct ipv6hdr);
113	struct ipv6_opt_hdr exthdr = (struct ipv6_opt_hdr)(skb->nh.ipv6h + 1);
114	unsigned int packet_len = skb->tail - skb->nh.raw;
115	int found_rhdr = 0;
116
117	*nexthdr = &skb->nh.ipv6h->nexthdr;
118
119	while (offset + 1 <= packet_len) {
120
121	switch (**nexthdr) {
122	case NEXTHDR_HOP:
123	break;
124	case NEXTHDR_ROUTING:
125	found_rhdr = 1;
126	break;
127	case NEXTHDR_DEST:
128	/*
129	* HAO MUST NOT appear more than once.
130	* XXX: It is better to try to find by the end of
131	* XXX: packet if HAO exists.
132	*/
133	if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
134	LIMIT_NETDEBUG(KERN_WARNING "mip6: hao exists already, override\n");
135	return offset;
136	}
137
138	if (found_rhdr)
139	return offset;
140
141	break;
142	default:
143	return offset;
144	}
145
146	offset += ipv6_optlen(exthdr);
147	*nexthdr = &exthdr->nexthdr;
148	exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
149	}
150
151	return offset;
152	}
153
154	static int mip6_destopt_init_state(struct xfrm_state *x)
155	{
156	if (x->id.spi) {
157	printk(KERN_INFO "%s: spi is not 0: %u\n", __FUNCTION__,
158	x->id.spi);
159	return -EINVAL;
160	}
161	if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
162	printk(KERN_INFO "%s: state's mode is not %u: %u\n",
163	__FUNCTION__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
164	return -EINVAL;
165	}
166
167	x->props.header_len = sizeof(struct ipv6_destopt_hdr) +
168	calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) +
169	sizeof(struct ipv6_destopt_hao);
170	BUG_TRAP(x->props.header_len == 24);
171
172	return 0;
173	}
174
175	/*
176	* Do nothing about destroying since it has no specific operation for
177	* destination options header unlike IPsec protocols.
178	*/
179	static void mip6_destopt_destroy(struct xfrm_state *x)
180	{
181	}
182
183	static struct xfrm_type mip6_destopt_type =
184	{
185	.description = "MIP6DESTOPT",
186	.owner = THIS_MODULE,
187	.proto = IPPROTO_DSTOPTS,
188	.flags = XFRM_TYPE_NON_FRAGMENT,
189	.init_state = mip6_destopt_init_state,
190	.destructor = mip6_destopt_destroy,
191	.input = mip6_destopt_input,
192	.output = mip6_destopt_output,
193	.hdr_offset = mip6_destopt_offset,
194	.local_addr = mip6_xfrm_addr,
195	};
196
2c8d7ca0 NT	197	static int mip6_rthdr_input(struct xfrm_state x, struct sk_buff skb)
	198	{
	199	struct rt2_hdr rt2 = (struct rt2_hdr )skb->data;
	200
	201	if (!ipv6_addr_equal(&rt2->addr, (struct in6_addr *)x->coaddr) &&
	202	!ipv6_addr_any((struct in6_addr *)x->coaddr))
	203	return -ENOENT;
	204
	205	return rt2->rt_hdr.nexthdr;
	206	}
	207
	208	/* Routing Header type 2 is inserted.
	209	* IP Header's dst address is replaced with Routing Header's Home Address.
	210	*/
	211	static int mip6_rthdr_output(struct xfrm_state x, struct sk_buff skb)
	212	{
	213	struct ipv6hdr *iph;
	214	struct rt2_hdr *rt2;
	215	u8 nexthdr;
	216
	217	iph = (struct ipv6hdr *)skb->data;
	218	iph->payload_len = htons(skb->len - sizeof(*iph));
	219
	220	nexthdr = *skb->nh.raw;
	221	*skb->nh.raw = IPPROTO_ROUTING;
	222
	223	rt2 = (struct rt2_hdr *)skb->h.raw;
	224	rt2->rt_hdr.nexthdr = nexthdr;
	225	rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
	226	rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
	227	rt2->rt_hdr.segments_left = 1;
	228	memset(&rt2->reserved, 0, sizeof(rt2->reserved));
	229
	230	BUG_TRAP(rt2->rt_hdr.hdrlen == 2);
	231
	232	memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
	233	memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
	234
	235	return 0;
	236	}
	237
	238	static int mip6_rthdr_offset(struct xfrm_state x, struct sk_buff skb,
	239	u8 **nexthdr)
	240	{
	241	u16 offset = sizeof(struct ipv6hdr);
	242	struct ipv6_opt_hdr exthdr = (struct ipv6_opt_hdr)(skb->nh.ipv6h + 1);
	243	unsigned int packet_len = skb->tail - skb->nh.raw;
	244	int found_rhdr = 0;
	245
	246	*nexthdr = &skb->nh.ipv6h->nexthdr;
	247
	248	while (offset + 1 <= packet_len) {
	249
	250	switch (**nexthdr) {
	251	case NEXTHDR_HOP:
	252	break;
	253	case NEXTHDR_ROUTING:
	254	if (offset + 3 <= packet_len) {
	255	struct ipv6_rt_hdr *rt;
	256	rt = (struct ipv6_rt_hdr *)(skb->nh.raw + offset);
	257	if (rt->type != 0)
	258	return offset;
	259	}
	260	found_rhdr = 1;
261	break;
262	case NEXTHDR_DEST:
263	if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
264	return offset;
265
266	if (found_rhdr)
267	return offset;
268
269	break;
270	default:
271	return offset;
272	}
273
274	offset += ipv6_optlen(exthdr);
275	*nexthdr = &exthdr->nexthdr;
276	exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
277	}
278
279	return offset;
280	}
281
282	static int mip6_rthdr_init_state(struct xfrm_state *x)
283	{
284	if (x->id.spi) {
285	printk(KERN_INFO "%s: spi is not 0: %u\n", __FUNCTION__,
286	x->id.spi);
287	return -EINVAL;
288	}
289	if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
290	printk(KERN_INFO "%s: state's mode is not %u: %u\n",
291	__FUNCTION__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
292	return -EINVAL;
293	}
294
295	x->props.header_len = sizeof(struct rt2_hdr);
296
297	return 0;
298	}
299
300	/*
301	* Do nothing about destroying since it has no specific operation for routing
302	* header type 2 unlike IPsec protocols.
303	*/
304	static void mip6_rthdr_destroy(struct xfrm_state *x)
305	{
306	}
307
308	static struct xfrm_type mip6_rthdr_type =
309	{
310	.description = "MIP6RT",
311	.owner = THIS_MODULE,
312	.proto = IPPROTO_ROUTING,
313	.flags = XFRM_TYPE_NON_FRAGMENT,
314	.init_state = mip6_rthdr_init_state,
315	.destructor = mip6_rthdr_destroy,
316	.input = mip6_rthdr_input,
317	.output = mip6_rthdr_output,
318	.hdr_offset = mip6_rthdr_offset,
319	.remote_addr = mip6_xfrm_addr,
320	};
321
322	int __init mip6_init(void)
323	{
324	printk(KERN_INFO "Mobile IPv6\n");
325
3d126890 NT	326	if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) {
	327	printk(KERN_INFO "%s: can't add xfrm type(destopt)\n", __FUNCTION__);
	328	goto mip6_destopt_xfrm_fail;
	329	}
2c8d7ca0 NT	330	if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
	331	printk(KERN_INFO "%s: can't add xfrm type(rthdr)\n", __FUNCTION__);
	332	goto mip6_rthdr_xfrm_fail;
	333	}
	334	return 0;
	335
	336	mip6_rthdr_xfrm_fail:
3d126890 NT	337	xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
3d126890 NT	338	mip6_destopt_xfrm_fail:
2c8d7ca0 NT	339	return -EAGAIN;
	340	}
	341
	342	void __exit mip6_fini(void)
	343	{
	344	if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
	345	printk(KERN_INFO "%s: can't remove xfrm type(rthdr)\n", __FUNCTION__);
3d126890 NT	346	if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
3d126890 NT	347	printk(KERN_INFO "%s: can't remove xfrm type(destopt)\n", __FUNCTION__);
2c8d7ca0	348	}