[apple/libinfo.git] / gen.subproj / rthdr.c

/*	$KAME: rthdr.c,v 1.19 2003/06/06 10:48:51 itojun Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/* __FBSDID("$FreeBSD: src/lib/libc/net/rthdr.c,v 1.9.10.1.4.1 2010/06/14 02:09:06 kensmith Exp $"); */

/*
 * These routines support RFC 2292.
 * __APPLE_USE_RFC_2292 selects the appropriate API in <netinet6/in6.h>
 */
#define __APPLE_USE_RFC_2292

#include <sys/cdefs.h>

#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/ip6.h>

#include <string.h>
#include <stdio.h>

/*
 * RFC2292 API
 */

size_t
inet6_rthdr_space(type, seg)
int type, seg;
{
	switch (type) {
		case IPV6_RTHDR_TYPE_0:
			if (seg < 1 || seg > 23)
				return (0);
#ifdef COMPAT_RFC2292
			return (CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1) +
							   sizeof(struct ip6_rthdr0)));
#else
			return (CMSG_SPACE(sizeof(struct in6_addr) * seg +
							   sizeof(struct ip6_rthdr0)));
#endif 
		default:
			return (0);
	}
}

struct cmsghdr *
inet6_rthdr_init(bp, type)
void *bp;
int type;
{
	struct cmsghdr *ch = (struct cmsghdr *)bp;
	struct ip6_rthdr *rthdr;

	rthdr = (struct ip6_rthdr *)CMSG_DATA(ch);

	ch->cmsg_level = IPPROTO_IPV6;
	ch->cmsg_type = IPV6_RTHDR;

	switch (type) {
		case IPV6_RTHDR_TYPE_0:
#ifdef COMPAT_RFC2292
			ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0) -
									sizeof(struct in6_addr));
#else
			ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0));
#endif 

			bzero(rthdr, sizeof(struct ip6_rthdr0));
			rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
			return (ch);
		default:
			return (NULL);
	}
}

/* ARGSUSED */
int
inet6_rthdr_add(cmsg, addr, flags)
struct cmsghdr *cmsg;
const struct in6_addr *addr;
u_int flags;
{
	struct ip6_rthdr *rthdr;

	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);

	switch (rthdr->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
		{
			struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
			if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT)
				return (-1);
			if (rt0->ip6r0_segleft == 23)
				return (-1);

#ifdef COMPAT_RFC1883		/* XXX */
			if (flags == IPV6_RTHDR_STRICT) {
				int c, b;
				c = rt0->ip6r0_segleft / 8;
				b = rt0->ip6r0_segleft % 8;
				rt0->ip6r0_slmap[c] |= (1 << (7 - b));
			}
#else
			if (flags != IPV6_RTHDR_LOOSE)
				return (-1);
#endif 
			rt0->ip6r0_segleft++;
			bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3),
				  sizeof(struct in6_addr));
			rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
			cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
			break;
		}
		default:
			return (-1);
	}

	return (0);
}

/* ARGSUSED */
int
inet6_rthdr_lasthop(cmsg, flags)
struct cmsghdr *cmsg;
unsigned int flags;
{
	struct ip6_rthdr *rthdr;

	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);

	switch (rthdr->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
		{
			struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
#ifdef COMPAT_RFC1883		/* XXX */
			if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT)
				return (-1);
#endif /* COMPAT_RFC1883 */
			if (rt0->ip6r0_segleft > 23)
				return (-1);
#ifdef COMPAT_RFC1883		/* XXX */
			if (flags == IPV6_RTHDR_STRICT) {
				int c, b;
				c = rt0->ip6r0_segleft / 8;
				b = rt0->ip6r0_segleft % 8;
				rt0->ip6r0_slmap[c] |= (1 << (7 - b));
			}
#else
			if (flags != IPV6_RTHDR_LOOSE)
				return (-1);
#endif /* COMPAT_RFC1883 */
			break;
		}
		default:
			return (-1);
	}

	return (0);
}

#if 0
int
inet6_rthdr_reverse(in, out)
const struct cmsghdr *in;
struct cmsghdr *out;
{

	return (-1);
}
#endif

int
inet6_rthdr_segments(cmsg)
const struct cmsghdr *cmsg;
{
	struct ip6_rthdr *rthdr;

	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);

	switch (rthdr->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
		{
			struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;

			if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
				return (-1);

			return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
		}

		default:
			return (-1);
	}
}

struct in6_addr *
inet6_rthdr_getaddr(cmsg, idx)
struct cmsghdr *cmsg;
int idx;
{
	struct ip6_rthdr *rthdr;

	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);

	switch (rthdr->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
		{
			struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
			int naddr;

			if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
				return NULL;
			naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
			if (idx <= 0 || naddr < idx)
				return NULL;
#ifdef COMPAT_RFC2292
			return (((struct in6_addr *)(rt0 + 1)) + idx - 1);
#else
			return (((struct in6_addr *)(rt0 + 1)) + idx);
#endif
		}

		default:
			return NULL;
	}
}

int
inet6_rthdr_getflags(cmsg, idx)
const struct cmsghdr *cmsg;
int idx;
{
	struct ip6_rthdr *rthdr;

	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);

	switch (rthdr->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
		{
			struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
			int naddr;

			if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
				return (-1);
			naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
			if (idx < 0 || naddr < idx)
				return (-1);
#ifdef COMPAT_RFC1883		/* XXX */
			if (rt0->ip6r0_slmap[idx / 8] & (0x80 >> (idx % 8)))
				return IPV6_RTHDR_STRICT;
			else
				return IPV6_RTHDR_LOOSE;
#else
			return IPV6_RTHDR_LOOSE;
#endif /* COMPAT_RFC1883 */
		}

		default:
			return (-1);
	}
}

/*
 * RFC3542 API
 */

socklen_t
inet6_rth_space(int type, int segments)
{
	switch (type) {
		case IPV6_RTHDR_TYPE_0:
			if ((segments >= 0) && (segments <= 127))
				return (((segments * 2) + 1) << 3);
			/* FALLTHROUGH */
		default:
			return (0);	/* type not suppported */
	}
}

void *
inet6_rth_init(void *bp, socklen_t bp_len, int type, int segments)
{
	struct ip6_rthdr *rth = (struct ip6_rthdr *)bp;
	struct ip6_rthdr0 *rth0;

	switch (type) {
		case IPV6_RTHDR_TYPE_0:
			/* length validation */
			if (bp_len < inet6_rth_space(IPV6_RTHDR_TYPE_0, segments))
				return (NULL);
			/* segment validation */
			if ((segments < 0) || (segments > 127))
				return (NULL);

			memset(bp, 0, bp_len);
			rth0 = (struct ip6_rthdr0 *)rth;
			rth0->ip6r0_len = segments * 2;
			rth0->ip6r0_type = IPV6_RTHDR_TYPE_0;
			rth0->ip6r0_segleft = 0;
			rth0->ip6r0_reserved = 0;
			break;
		default:
			return (NULL);	/* type not supported */
	}

	return (bp);
}

int
inet6_rth_add(void *bp, const struct in6_addr *addr)
{
	struct ip6_rthdr *rth = (struct ip6_rthdr *)bp;
	struct ip6_rthdr0 *rth0;
	struct in6_addr *nextaddr;

	switch (rth->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
			rth0 = (struct ip6_rthdr0 *)rth;
			/* Don't exceed the number of stated segments */
			if (rth0->ip6r0_segleft == (rth0->ip6r0_len / 2))
				return (-1);
			nextaddr = (struct in6_addr *)(rth0 + 1) + rth0->ip6r0_segleft;
			*nextaddr = *addr;
			rth0->ip6r0_segleft++;
			break;
		default:
			return (-1);	/* type not supported */
	}

	return (0);
}

int
inet6_rth_reverse(const void *in, void *out)
{
	struct ip6_rthdr *rth_in = (struct ip6_rthdr *)in;
	struct ip6_rthdr0 *rth0_in, *rth0_out;
	int i, segments;

	switch (rth_in->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
			rth0_in = (struct ip6_rthdr0 *)in;
			rth0_out = (struct ip6_rthdr0 *)out;

			/* parameter validation XXX too paranoid? */
			if (rth0_in->ip6r0_len % 2)
				return (-1);
			segments = rth0_in->ip6r0_len / 2;

			/* we can't use memcpy here, since in and out may overlap */
			memmove((void *)rth0_out, (void *)rth0_in,
					((rth0_in->ip6r0_len) + 1) << 3);
			rth0_out->ip6r0_segleft = segments;

			/* reverse the addresses */
			for (i = 0; i < segments / 2; i++) {
				struct in6_addr addr_tmp, *addr1, *addr2;

				addr1 = (struct in6_addr *)(rth0_out + 1) + i;
				addr2 = (struct in6_addr *)(rth0_out + 1) +
				(segments - i - 1);
				addr_tmp = *addr1;
				*addr1 = *addr2;
				*addr2 = addr_tmp;
			}

			break;
		default:
			return (-1);	/* type not supported */
	}

	return (0);
}

int
inet6_rth_segments(const void *bp)
{
	struct ip6_rthdr *rh = (struct ip6_rthdr *)bp;
	struct ip6_rthdr0 *rh0;
	int addrs;

	switch (rh->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
			rh0 = (struct ip6_rthdr0 *)bp;

			/*
			 * Validation for a type-0 routing header.
			 * Is this too strict?
			 */
			if ((rh0->ip6r0_len % 2) != 0 ||
				(addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft)
				return (-1);

			return (addrs);
		default:
			return (-1);	/* unknown type */
	}
}

struct in6_addr *
inet6_rth_getaddr(const void *bp, int idx)
{
	struct ip6_rthdr *rh = (struct ip6_rthdr *)bp;
	struct ip6_rthdr0 *rh0;
	int addrs;

	switch (rh->ip6r_type) {
		case IPV6_RTHDR_TYPE_0:
			rh0 = (struct ip6_rthdr0 *)bp;

			/*
			 * Validation for a type-0 routing header.
			 * Is this too strict?
			 */
			if ((rh0->ip6r0_len % 2) != 0 ||
				(addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft)
				return (NULL);

			if (idx < 0 || addrs <= idx)
				return (NULL);

			return (((struct in6_addr *)(rh0 + 1)) + idx);
		default:
			return (NULL);	/* unknown type */
			break;
	}
}
Commit	Line	Data
e44d8d47 A	1	/* $KAME: rthdr.c,v 1.19 2003/06/06 10:48:51 itojun Exp $ */
e44d8d47 A	2
3b7c7bd7 A	3	/*
	4	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. Neither the name of the project nor the names of its contributors
	16	* may be used to endorse or promote products derived from this software
	17	* without specific prior written permission.
	18	*
	19	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	20	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	21	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	22	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	23	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	24	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	25	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	27	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	28	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	29	* SUCH DAMAGE.
3b7c7bd7 A	30	*/
3b7c7bd7 A	31
e44d8d47 A	32	/* __FBSDID("$FreeBSD: src/lib/libc/net/rthdr.c,v 1.9.10.1.4.1 2010/06/14 02:09:06 kensmith Exp $"); */
	33
	34	/*
	35	* These routines support RFC 2292.
	36	* __APPLE_USE_RFC_2292 selects the appropriate API in <netinet6/in6.h>
	37	*/
	38	#define __APPLE_USE_RFC_2292
	39
	40	#include <sys/cdefs.h>
	41
3b7c7bd7 A	42	#include <sys/param.h>
	43	#include <sys/types.h>
	44	#include <sys/socket.h>
	45
	46	#include <netinet/in.h>
	47	#include <netinet/ip6.h>
	48
	49	#include <string.h>
	50	#include <stdio.h>
	51
e44d8d47 A	52	/*
	53	* RFC2292 API
	54	*/
	55
3b7c7bd7 A	56	size_t
3b7c7bd7 A	57	inet6_rthdr_space(type, seg)
e44d8d47	58	int type, seg;
3b7c7bd7	59	{
e44d8d47 A	60	switch (type) {
	61	case IPV6_RTHDR_TYPE_0:
	62	if (seg < 1 \|\| seg > 23)
	63	return (0);
	64	#ifdef COMPAT_RFC2292
	65	return (CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1) +
	66	sizeof(struct ip6_rthdr0)));
	67	#else
	68	return (CMSG_SPACE(sizeof(struct in6_addr) * seg +
	69	sizeof(struct ip6_rthdr0)));
3b7c7bd7	70	#endif
e44d8d47 A	71	default:
	72	return (0);
	73	}
3b7c7bd7 A	74	}
	75
	76	struct cmsghdr *
	77	inet6_rthdr_init(bp, type)
e44d8d47 A	78	void *bp;
e44d8d47 A	79	int type;
3b7c7bd7	80	{
e44d8d47 A	81	struct cmsghdr ch = (struct cmsghdr )bp;
	82	struct ip6_rthdr *rthdr;
	83
	84	rthdr = (struct ip6_rthdr *)CMSG_DATA(ch);
	85
	86	ch->cmsg_level = IPPROTO_IPV6;
	87	ch->cmsg_type = IPV6_RTHDR;
	88
	89	switch (type) {
	90	case IPV6_RTHDR_TYPE_0:
	91	#ifdef COMPAT_RFC2292
	92	ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0) -
	93	sizeof(struct in6_addr));
	94	#else
	95	ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0));
3b7c7bd7	96	#endif
e44d8d47 A	97
	98	bzero(rthdr, sizeof(struct ip6_rthdr0));
	99	rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
	100	return (ch);
	101	default:
	102	return (NULL);
	103	}
3b7c7bd7 A	104	}
3b7c7bd7 A	105
e44d8d47	106	/* ARGSUSED */
3b7c7bd7 A	107	int
3b7c7bd7 A	108	inet6_rthdr_add(cmsg, addr, flags)
e44d8d47 A	109	struct cmsghdr *cmsg;
	110	const struct in6_addr *addr;
	111	u_int flags;
3b7c7bd7	112	{
e44d8d47 A	113	struct ip6_rthdr *rthdr;
	114
	115	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
	116
	117	switch (rthdr->ip6r_type) {
	118	case IPV6_RTHDR_TYPE_0:
	119	{
	120	struct ip6_rthdr0 rt0 = (struct ip6_rthdr0 )rthdr;
	121	if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT)
	122	return (-1);
	123	if (rt0->ip6r0_segleft == 23)
	124	return (-1);
	125
	126	#ifdef COMPAT_RFC1883 /* XXX */
	127	if (flags == IPV6_RTHDR_STRICT) {
	128	int c, b;
	129	c = rt0->ip6r0_segleft / 8;
	130	b = rt0->ip6r0_segleft % 8;
	131	rt0->ip6r0_slmap[c] \|= (1 << (7 - b));
	132	}
	133	#else
	134	if (flags != IPV6_RTHDR_LOOSE)
	135	return (-1);
3b7c7bd7	136	#endif
e44d8d47 A	137	rt0->ip6r0_segleft++;
	138	bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3),
	139	sizeof(struct in6_addr));
	140	rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
	141	cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
	142	break;
	143	}
	144	default:
	145	return (-1);
	146	}
3b7c7bd7	147
e44d8d47	148	return (0);
3b7c7bd7 A	149	}
3b7c7bd7 A	150
e44d8d47	151	/* ARGSUSED */
3b7c7bd7 A	152	int
3b7c7bd7 A	153	inet6_rthdr_lasthop(cmsg, flags)
e44d8d47 A	154	struct cmsghdr *cmsg;
e44d8d47 A	155	unsigned int flags;
3b7c7bd7	156	{
e44d8d47 A	157	struct ip6_rthdr *rthdr;
	158
	159	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
	160
	161	switch (rthdr->ip6r_type) {
	162	case IPV6_RTHDR_TYPE_0:
	163	{
	164	struct ip6_rthdr0 rt0 = (struct ip6_rthdr0 )rthdr;
	165	#ifdef COMPAT_RFC1883 /* XXX */
	166	if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT)
	167	return (-1);
	168	#endif /* COMPAT_RFC1883 */
	169	if (rt0->ip6r0_segleft > 23)
	170	return (-1);
	171	#ifdef COMPAT_RFC1883 /* XXX */
	172	if (flags == IPV6_RTHDR_STRICT) {
	173	int c, b;
	174	c = rt0->ip6r0_segleft / 8;
	175	b = rt0->ip6r0_segleft % 8;
	176	rt0->ip6r0_slmap[c] \|= (1 << (7 - b));
	177	}
	178	#else
	179	if (flags != IPV6_RTHDR_LOOSE)
	180	return (-1);
	181	#endif /* COMPAT_RFC1883 */
	182	break;
	183	}
	184	default:
	185	return (-1);
	186	}
3b7c7bd7	187
e44d8d47	188	return (0);
3b7c7bd7 A	189	}
	190
	191	#if 0
	192	int
	193	inet6_rthdr_reverse(in, out)
e44d8d47 A	194	const struct cmsghdr *in;
e44d8d47 A	195	struct cmsghdr *out;
3b7c7bd7	196	{
e44d8d47 A	197
e44d8d47 A	198	return (-1);
3b7c7bd7 A	199	}
	200	#endif
	201
	202	int
	203	inet6_rthdr_segments(cmsg)
e44d8d47	204	const struct cmsghdr *cmsg;
3b7c7bd7	205	{
e44d8d47	206	struct ip6_rthdr *rthdr;
3b7c7bd7	207
e44d8d47	208	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
3b7c7bd7	209
e44d8d47 A	210	switch (rthdr->ip6r_type) {
	211	case IPV6_RTHDR_TYPE_0:
	212	{
	213	struct ip6_rthdr0 rt0 = (struct ip6_rthdr0 )rthdr;
3b7c7bd7	214
e44d8d47 A	215	if (rt0->ip6r0_len % 2 \|\| 46 < rt0->ip6r0_len)
e44d8d47 A	216	return (-1);
3b7c7bd7	217
e44d8d47 A	218	return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
e44d8d47 A	219	}
3b7c7bd7	220
e44d8d47 A	221	default:
	222	return (-1);
	223	}
3b7c7bd7 A	224	}
	225
	226	struct in6_addr *
e44d8d47 A	227	inet6_rthdr_getaddr(cmsg, idx)
	228	struct cmsghdr *cmsg;
	229	int idx;
3b7c7bd7	230	{
e44d8d47 A	231	struct ip6_rthdr *rthdr;
	232
	233	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
	234
	235	switch (rthdr->ip6r_type) {
	236	case IPV6_RTHDR_TYPE_0:
	237	{
	238	struct ip6_rthdr0 rt0 = (struct ip6_rthdr0 )rthdr;
	239	int naddr;
	240
	241	if (rt0->ip6r0_len % 2 \|\| 46 < rt0->ip6r0_len)
	242	return NULL;
	243	naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
	244	if (idx <= 0 \|\| naddr < idx)
	245	return NULL;
	246	#ifdef COMPAT_RFC2292
	247	return (((struct in6_addr *)(rt0 + 1)) + idx - 1);
	248	#else
	249	return (((struct in6_addr *)(rt0 + 1)) + idx);
	250	#endif
	251	}
3b7c7bd7	252
e44d8d47 A	253	default:
	254	return NULL;
	255	}
	256	}
3b7c7bd7	257
e44d8d47 A	258	int
	259	inet6_rthdr_getflags(cmsg, idx)
	260	const struct cmsghdr *cmsg;
	261	int idx;
	262	{
	263	struct ip6_rthdr *rthdr;
	264
	265	rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
	266
	267	switch (rthdr->ip6r_type) {
	268	case IPV6_RTHDR_TYPE_0:
	269	{
	270	struct ip6_rthdr0 rt0 = (struct ip6_rthdr0 )rthdr;
	271	int naddr;
	272
	273	if (rt0->ip6r0_len % 2 \|\| 46 < rt0->ip6r0_len)
	274	return (-1);
	275	naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
	276	if (idx < 0 \|\| naddr < idx)
	277	return (-1);
	278	#ifdef COMPAT_RFC1883 /* XXX */
	279	if (rt0->ip6r0_slmap[idx / 8] & (0x80 >> (idx % 8)))
	280	return IPV6_RTHDR_STRICT;
	281	else
	282	return IPV6_RTHDR_LOOSE;
	283	#else
	284	return IPV6_RTHDR_LOOSE;
	285	#endif /* COMPAT_RFC1883 */
	286	}
	287
	288	default:
	289	return (-1);
	290	}
	291	}
3b7c7bd7	292
e44d8d47 A	293	/*
	294	* RFC3542 API
	295	*/
	296
	297	socklen_t
	298	inet6_rth_space(int type, int segments)
	299	{
	300	switch (type) {
	301	case IPV6_RTHDR_TYPE_0:
	302	if ((segments >= 0) && (segments <= 127))
	303	return (((segments * 2) + 1) << 3);
	304	/* FALLTHROUGH */
	305	default:
	306	return (0); /* type not suppported */
3b7c7bd7	307	}
e44d8d47 A	308	}
	309
	310	void *
	311	inet6_rth_init(void *bp, socklen_t bp_len, int type, int segments)
	312	{
	313	struct ip6_rthdr rth = (struct ip6_rthdr )bp;
	314	struct ip6_rthdr0 *rth0;
	315
	316	switch (type) {
	317	case IPV6_RTHDR_TYPE_0:
	318	/* length validation */
	319	if (bp_len < inet6_rth_space(IPV6_RTHDR_TYPE_0, segments))
	320	return (NULL);
	321	/* segment validation */
	322	if ((segments < 0) \|\| (segments > 127))
	323	return (NULL);
	324
	325	memset(bp, 0, bp_len);
	326	rth0 = (struct ip6_rthdr0 *)rth;
	327	rth0->ip6r0_len = segments * 2;
	328	rth0->ip6r0_type = IPV6_RTHDR_TYPE_0;
	329	rth0->ip6r0_segleft = 0;
	330	rth0->ip6r0_reserved = 0;
	331	break;
	332	default:
	333	return (NULL); /* type not supported */
3b7c7bd7	334	}
3b7c7bd7	335
e44d8d47	336	return (bp);
3b7c7bd7 A	337	}
	338
	339	int
e44d8d47	340	inet6_rth_add(void bp, const struct in6_addr addr)
3b7c7bd7	341	{
e44d8d47 A	342	struct ip6_rthdr rth = (struct ip6_rthdr )bp;
	343	struct ip6_rthdr0 *rth0;
	344	struct in6_addr *nextaddr;
	345
	346	switch (rth->ip6r_type) {
	347	case IPV6_RTHDR_TYPE_0:
	348	rth0 = (struct ip6_rthdr0 *)rth;
	349	/* Don't exceed the number of stated segments */
	350	if (rth0->ip6r0_segleft == (rth0->ip6r0_len / 2))
	351	return (-1);
	352	nextaddr = (struct in6_addr *)(rth0 + 1) + rth0->ip6r0_segleft;
	353	nextaddr = addr;
	354	rth0->ip6r0_segleft++;
	355	break;
	356	default:
	357	return (-1); /* type not supported */
	358	}
	359
	360	return (0);
	361	}
3b7c7bd7	362
e44d8d47 A	363	int
	364	inet6_rth_reverse(const void in, void out)
	365	{
	366	struct ip6_rthdr rth_in = (struct ip6_rthdr )in;
	367	struct ip6_rthdr0 rth0_in, rth0_out;
	368	int i, segments;
	369
	370	switch (rth_in->ip6r_type) {
	371	case IPV6_RTHDR_TYPE_0:
	372	rth0_in = (struct ip6_rthdr0 *)in;
	373	rth0_out = (struct ip6_rthdr0 *)out;
	374
	375	/* parameter validation XXX too paranoid? */
	376	if (rth0_in->ip6r0_len % 2)
	377	return (-1);
	378	segments = rth0_in->ip6r0_len / 2;
	379
	380	/* we can't use memcpy here, since in and out may overlap */
	381	memmove((void )rth0_out, (void )rth0_in,
	382	((rth0_in->ip6r0_len) + 1) << 3);
	383	rth0_out->ip6r0_segleft = segments;
	384
	385	/* reverse the addresses */
	386	for (i = 0; i < segments / 2; i++) {
	387	struct in6_addr addr_tmp, addr1, addr2;
	388
	389	addr1 = (struct in6_addr *)(rth0_out + 1) + i;
	390	addr2 = (struct in6_addr *)(rth0_out + 1) +
	391	(segments - i - 1);
	392	addr_tmp = *addr1;
	393	addr1 = addr2;
	394	*addr2 = addr_tmp;
	395	}
	396
	397	break;
	398	default:
	399	return (-1); /* type not supported */
	400	}
3b7c7bd7	401
e44d8d47 A	402	return (0);
e44d8d47 A	403	}
3b7c7bd7	404
e44d8d47 A	405	int
	406	inet6_rth_segments(const void *bp)
	407	{
	408	struct ip6_rthdr rh = (struct ip6_rthdr )bp;
	409	struct ip6_rthdr0 *rh0;
	410	int addrs;
	411
	412	switch (rh->ip6r_type) {
	413	case IPV6_RTHDR_TYPE_0:
	414	rh0 = (struct ip6_rthdr0 *)bp;
	415
	416	/*
	417	* Validation for a type-0 routing header.
	418	* Is this too strict?
	419	*/
	420	if ((rh0->ip6r0_len % 2) != 0 \|\|
	421	(addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft)
	422	return (-1);
	423
	424	return (addrs);
	425	default:
	426	return (-1); /* unknown type */
3b7c7bd7	427	}
e44d8d47 A	428	}
	429
	430	struct in6_addr *
	431	inet6_rth_getaddr(const void *bp, int idx)
	432	{
	433	struct ip6_rthdr rh = (struct ip6_rthdr )bp;
	434	struct ip6_rthdr0 *rh0;
	435	int addrs;
	436
	437	switch (rh->ip6r_type) {
	438	case IPV6_RTHDR_TYPE_0:
	439	rh0 = (struct ip6_rthdr0 *)bp;
	440
	441	/*
	442	* Validation for a type-0 routing header.
	443	* Is this too strict?
	444	*/
	445	if ((rh0->ip6r0_len % 2) != 0 \|\|
	446	(addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft)
	447	return (NULL);
	448
	449	if (idx < 0 \|\| addrs <= idx)
	450	return (NULL);
	451
	452	return (((struct in6_addr *)(rh0 + 1)) + idx);
	453	default:
	454	return (NULL); /* unknown type */
	455	break;
3b7c7bd7	456	}
3b7c7bd7	457	}