[net-next-2.6.git] / net / sctp / bind_addr.c

/* SCTP kernel reference Implementation
 * (C) Copyright IBM Corp. 2001, 2003
 * Copyright (c) Cisco 1999,2000
 * Copyright (c) Motorola 1999,2000,2001
 * Copyright (c) La Monte H.P. Yarroll 2001
 *
 * This file is part of the SCTP kernel reference implementation.
 *
 * A collection class to handle the storage of transport addresses.
 *
 * The SCTP reference implementation 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, or (at your option)
 * any later version.
 *
 * The SCTP reference implementation 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 GNU CC; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
 *
 * Or submit a bug report through the following website:
 *    http://www.sf.net/projects/lksctp
 *
 * Written or modified by:
 *    La Monte H.P. Yarroll <piggy@acm.org>
 *    Karl Knutson          <karl@athena.chicago.il.us>
 *    Jon Grimm             <jgrimm@us.ibm.com>
 *    Daisy Chang           <daisyc@us.ibm.com>
 *
 * Any bugs reported given to us we will try to fix... any fixes shared will
 * be incorporated into the next SCTP release.
 */

#include <linux/types.h>
#include <linux/in.h>
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/if_inet6.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>

/* Forward declarations for internal helpers. */
static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
			      sctp_scope_t scope, gfp_t gfp,
			      int flags);
static void sctp_bind_addr_clean(struct sctp_bind_addr *);

/* First Level Abstractions. */

/* Copy 'src' to 'dest' taking 'scope' into account.  Omit addresses
 * in 'src' which have a broader scope than 'scope'.
 */
int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
			const struct sctp_bind_addr *src,
			sctp_scope_t scope, gfp_t gfp,
			int flags)
{
	struct sctp_sockaddr_entry *addr;
	struct list_head *pos;
	int error = 0;

	/* All addresses share the same port.  */
	dest->port = src->port;

	/* Extract the addresses which are relevant for this scope.  */
	list_for_each(pos, &src->address_list) {
		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
		error = sctp_copy_one_addr(dest, &addr->a, scope,
					   gfp, flags);
		if (error < 0)
			goto out;
	}

	/* If there are no addresses matching the scope and
	 * this is global scope, try to get a link scope address, with
	 * the assumption that we must be sitting behind a NAT.
	 */
	if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
		list_for_each(pos, &src->address_list) {
			addr = list_entry(pos, struct sctp_sockaddr_entry,
					  list);
			error = sctp_copy_one_addr(dest, &addr->a,
						   SCTP_SCOPE_LINK, gfp,
						   flags);
			if (error < 0)
				goto out;
		}
	}

out:
	if (error)
		sctp_bind_addr_clean(dest);

	return error;
}

/* Initialize the SCTP_bind_addr structure for either an endpoint or
 * an association.
 */
void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
{
	bp->malloced = 0;

	INIT_LIST_HEAD(&bp->address_list);
	bp->port = port;
}

/* Dispose of the address list. */
static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
{
	struct sctp_sockaddr_entry *addr;
	struct list_head *pos, *temp;

	/* Empty the bind address list. */
	list_for_each_safe(pos, temp, &bp->address_list) {
		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
		list_del(pos);
		kfree(addr);
		SCTP_DBG_OBJCNT_DEC(addr);
	}
}

/* Dispose of an SCTP_bind_addr structure  */
void sctp_bind_addr_free(struct sctp_bind_addr *bp)
{
	/* Empty the bind address list. */
	sctp_bind_addr_clean(bp);

	if (bp->malloced) {
		kfree(bp);
		SCTP_DBG_OBJCNT_DEC(bind_addr);
	}
}

/* Add an address to the bind address list in the SCTP_bind_addr structure. */
int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
		       __u8 use_as_src, gfp_t gfp)
{
	struct sctp_sockaddr_entry *addr;

	/* Add the address to the bind address list.  */
	addr = t_new(struct sctp_sockaddr_entry, gfp);
	if (!addr)
		return -ENOMEM;

	memcpy(&addr->a, new, sizeof(*new));

	/* Fix up the port if it has not yet been set.
	 * Both v4 and v6 have the port at the same offset.
	 */
	if (!addr->a.v4.sin_port)
		addr->a.v4.sin_port = htons(bp->port);

	addr->use_as_src = use_as_src;

	INIT_LIST_HEAD(&addr->list);
	list_add_tail(&addr->list, &bp->address_list);
	SCTP_DBG_OBJCNT_INC(addr);

	return 0;
}

/* Delete an address from the bind address list in the SCTP_bind_addr
 * structure.
 */
int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
{
	struct list_head *pos, *temp;
	struct sctp_sockaddr_entry *addr;

	list_for_each_safe(pos, temp, &bp->address_list) {
		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
		if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
			/* Found the exact match. */
			list_del(pos);
			kfree(addr);
			SCTP_DBG_OBJCNT_DEC(addr);

			return 0;
		}
	}

	return -EINVAL;
}

/* Create a network byte-order representation of all the addresses
 * formated as SCTP parameters.
 *
 * The second argument is the return value for the length.
 */
union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
					 int *addrs_len,
					 gfp_t gfp)
{
	union sctp_params addrparms;
	union sctp_params retval;
	int addrparms_len;
	union sctp_addr_param rawaddr;
	int len;
	struct sctp_sockaddr_entry *addr;
	struct list_head *pos;
	struct sctp_af *af;

	addrparms_len = 0;
	len = 0;

	/* Allocate enough memory at once. */
	list_for_each(pos, &bp->address_list) {
		len += sizeof(union sctp_addr_param);
	}

	/* Don't even bother embedding an address if there
	 * is only one.
	 */
	if (len == sizeof(union sctp_addr_param)) {
		retval.v = NULL;
		goto end_raw;
	}

	retval.v = kmalloc(len, gfp);
	if (!retval.v)
		goto end_raw;

	addrparms = retval;

	list_for_each(pos, &bp->address_list) {
		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
		af = sctp_get_af_specific(addr->a.v4.sin_family);
		len = af->to_addr_param(&addr->a, &rawaddr);
		memcpy(addrparms.v, &rawaddr, len);
		addrparms.v += len;
		addrparms_len += len;
	}

end_raw:
	*addrs_len = addrparms_len;
	return retval;
}

/*
 * Create an address list out of the raw address list format (IPv4 and IPv6
 * address parameters).
 */
int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
			   int addrs_len, __u16 port, gfp_t gfp)
{
	union sctp_addr_param *rawaddr;
	struct sctp_paramhdr *param;
	union sctp_addr addr;
	int retval = 0;
	int len;
	struct sctp_af *af;

	/* Convert the raw address to standard address format */
	while (addrs_len) {
		param = (struct sctp_paramhdr *)raw_addr_list;
		rawaddr = (union sctp_addr_param *)raw_addr_list;

		af = sctp_get_af_specific(param_type2af(param->type));
		if (unlikely(!af)) {
			retval = -EINVAL;
			sctp_bind_addr_clean(bp);
			break;
		}

		af->from_addr_param(&addr, rawaddr, htons(port), 0);
		retval = sctp_add_bind_addr(bp, &addr, 1, gfp);
		if (retval) {
			/* Can't finish building the list, clean up. */
			sctp_bind_addr_clean(bp);
			break;
		}

		len = ntohs(param->length);
		addrs_len -= len;
		raw_addr_list += len;
	}

	return retval;
}

/********************************************************************
 * 2nd Level Abstractions
 ********************************************************************/

/* Does this contain a specified address?  Allow wildcarding. */
int sctp_bind_addr_match(struct sctp_bind_addr *bp,
			 const union sctp_addr *addr,
			 struct sctp_sock *opt)
{
	struct sctp_sockaddr_entry *laddr;
	struct list_head *pos;

	list_for_each(pos, &bp->address_list) {
		laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
		if (opt->pf->cmp_addr(&laddr->a, addr, opt))
			return 1;
	}

	return 0;
}

/* Find the first address in the bind address list that is not present in
 * the addrs packed array.
 */
union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr	*bp,
					const union sctp_addr	*addrs,
					int			addrcnt,
					struct sctp_sock	*opt)
{
	struct sctp_sockaddr_entry	*laddr;
	union sctp_addr			*addr;
	void 				*addr_buf;
	struct sctp_af			*af;
	struct list_head		*pos;
	int				i;

	list_for_each(pos, &bp->address_list) {
		laddr = list_entry(pos, struct sctp_sockaddr_entry, list);

		addr_buf = (union sctp_addr *)addrs;
		for (i = 0; i < addrcnt; i++) {
			addr = (union sctp_addr *)addr_buf;
			af = sctp_get_af_specific(addr->v4.sin_family);
			if (!af)
				return NULL;

			if (opt->pf->cmp_addr(&laddr->a, addr, opt))
				break;

			addr_buf += af->sockaddr_len;
		}
		if (i == addrcnt)
			return &laddr->a;
	}

	return NULL;
}

/* Copy out addresses from the global local address list. */
static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
			      union sctp_addr *addr,
			      sctp_scope_t scope, gfp_t gfp,
			      int flags)
{
	int error = 0;

	if (sctp_is_any(addr)) {
		error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
	} else if (sctp_in_scope(addr, scope)) {
		/* Now that the address is in scope, check to see if
		 * the address type is supported by local sock as
		 * well as the remote peer.
		 */
		if ((((AF_INET == addr->sa.sa_family) &&
		      (flags & SCTP_ADDR4_PEERSUPP))) ||
		    (((AF_INET6 == addr->sa.sa_family) &&
		      (flags & SCTP_ADDR6_ALLOWED) &&
		      (flags & SCTP_ADDR6_PEERSUPP))))
			error = sctp_add_bind_addr(dest, addr, 1, gfp);
	}

	return error;
}

/* Is this a wildcard address?  */
int sctp_is_any(const union sctp_addr *addr)
{
	struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
	if (!af)
		return 0;
	return af->is_any(addr);
}

/* Is 'addr' valid for 'scope'?  */
int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
{
	sctp_scope_t addr_scope = sctp_scope(addr);

	/* The unusable SCTP addresses will not be considered with
	 * any defined scopes.
	 */
	if (SCTP_SCOPE_UNUSABLE == addr_scope)
		return 0;
	/*
	 * For INIT and INIT-ACK address list, let L be the level of
	 * of requested destination address, sender and receiver
	 * SHOULD include all of its addresses with level greater
	 * than or equal to L.
	 */
	if (addr_scope <= scope)
		return 1;

	return 0;
}

/********************************************************************
 * 3rd Level Abstractions
 ********************************************************************/

/* What is the scope of 'addr'?  */
sctp_scope_t sctp_scope(const union sctp_addr *addr)
{
	struct sctp_af *af;

	af = sctp_get_af_specific(addr->sa.sa_family);
	if (!af)
		return SCTP_SCOPE_UNUSABLE;

	return af->scope((union sctp_addr *)addr);
}
Commit	Line	Data
1da177e4 LT	1	/* SCTP kernel reference Implementation
	2	* (C) Copyright IBM Corp. 2001, 2003
	3	* Copyright (c) Cisco 1999,2000
	4	* Copyright (c) Motorola 1999,2000,2001
	5	* Copyright (c) La Monte H.P. Yarroll 2001
	6	*
	7	* This file is part of the SCTP kernel reference implementation.
	8	*
	9	* A collection class to handle the storage of transport addresses.
	10	*
	11	* The SCTP reference implementation is free software;
	12	* you can redistribute it and/or modify it under the terms of
	13	* the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2, or (at your option)
	15	* any later version.
	16	*
	17	* The SCTP reference implementation is distributed in the hope that it
	18	* will be useful, but WITHOUT ANY WARRANTY; without even the implied
	19	* ************************
	20	* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	21	* See the GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with GNU CC; see the file COPYING. If not, write to
	25	* the Free Software Foundation, 59 Temple Place - Suite 330,
	26	* Boston, MA 02111-1307, USA.
	27	*
	28	* Please send any bug reports or fixes you make to the
	29	* email address(es):
	30	* lksctp developers <lksctp-developers@lists.sourceforge.net>
	31	*
	32	* Or submit a bug report through the following website:
	33	* http://www.sf.net/projects/lksctp
	34	*
	35	* Written or modified by:
	36	* La Monte H.P. Yarroll <piggy@acm.org>
	37	* Karl Knutson <karl@athena.chicago.il.us>
	38	* Jon Grimm <jgrimm@us.ibm.com>
	39	* Daisy Chang <daisyc@us.ibm.com>
	40	*
	41	* Any bugs reported given to us we will try to fix... any fixes shared will
	42	* be incorporated into the next SCTP release.
	43	*/
	44
	45	#include <linux/types.h>
1da177e4 LT	46	#include <linux/in.h>
	47	#include <net/sock.h>
	48	#include <net/ipv6.h>
	49	#include <net/if_inet6.h>
	50	#include <net/sctp/sctp.h>
	51	#include <net/sctp/sm.h>
	52
	53	/* Forward declarations for internal helpers. */
	54	static int sctp_copy_one_addr(struct sctp_bind_addr , union sctp_addr ,
dd0fc66f	55	sctp_scope_t scope, gfp_t gfp,
3182cd84	56	int flags);
1da177e4 LT	57	static void sctp_bind_addr_clean(struct sctp_bind_addr *);
	58
	59	/* First Level Abstractions. */
	60
	61	/* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
	62	* in 'src' which have a broader scope than 'scope'.
	63	*/
d808ad9a	64	int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
1da177e4	65	const struct sctp_bind_addr *src,
dd0fc66f	66	sctp_scope_t scope, gfp_t gfp,
3182cd84	67	int flags)
1da177e4 LT	68	{
	69	struct sctp_sockaddr_entry *addr;
	70	struct list_head *pos;
	71	int error = 0;
	72
	73	/* All addresses share the same port. */
	74	dest->port = src->port;
	75
	76	/* Extract the addresses which are relevant for this scope. */
	77	list_for_each(pos, &src->address_list) {
	78	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
02a8a4db	79	error = sctp_copy_one_addr(dest, &addr->a, scope,
1da177e4 LT	80	gfp, flags);
	81	if (error < 0)
	82	goto out;
	83	}
	84
	85	/* If there are no addresses matching the scope and
	86	* this is global scope, try to get a link scope address, with
	87	* the assumption that we must be sitting behind a NAT.
	88	*/
	89	if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
	90	list_for_each(pos, &src->address_list) {
	91	addr = list_entry(pos, struct sctp_sockaddr_entry,
	92	list);
02a8a4db	93	error = sctp_copy_one_addr(dest, &addr->a,
1da177e4 LT	94	SCTP_SCOPE_LINK, gfp,
	95	flags);
	96	if (error < 0)
	97	goto out;
	98	}
	99	}
	100
	101	out:
	102	if (error)
	103	sctp_bind_addr_clean(dest);
	104
	105	return error;
	106	}
	107
	108	/* Initialize the SCTP_bind_addr structure for either an endpoint or
	109	* an association.
	110	*/
	111	void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
	112	{
	113	bp->malloced = 0;
	114
	115	INIT_LIST_HEAD(&bp->address_list);
	116	bp->port = port;
	117	}
	118
	119	/* Dispose of the address list. */
	120	static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
	121	{
	122	struct sctp_sockaddr_entry *addr;
	123	struct list_head pos, temp;
	124
	125	/* Empty the bind address list. */
	126	list_for_each_safe(pos, temp, &bp->address_list) {
	127	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
	128	list_del(pos);
	129	kfree(addr);
	130	SCTP_DBG_OBJCNT_DEC(addr);
	131	}
	132	}
	133
	134	/* Dispose of an SCTP_bind_addr structure */
	135	void sctp_bind_addr_free(struct sctp_bind_addr *bp)
	136	{
	137	/* Empty the bind address list. */
	138	sctp_bind_addr_clean(bp);
	139
	140	if (bp->malloced) {
	141	kfree(bp);
	142	SCTP_DBG_OBJCNT_DEC(bind_addr);
	143	}
	144	}
	145
	146	/* Add an address to the bind address list in the SCTP_bind_addr structure. */
	147	int sctp_add_bind_addr(struct sctp_bind_addr bp, union sctp_addr new,
dc022a98	148	__u8 use_as_src, gfp_t gfp)
1da177e4 LT	149	{
	150	struct sctp_sockaddr_entry *addr;
	151
	152	/* Add the address to the bind address list. */
	153	addr = t_new(struct sctp_sockaddr_entry, gfp);
	154	if (!addr)
	155	return -ENOMEM;
	156
5ab7b859	157	memcpy(&addr->a, new, sizeof(*new));
1da177e4 LT	158
	159	/* Fix up the port if it has not yet been set.
	160	* Both v4 and v6 have the port at the same offset.
	161	*/
5ab7b859 AV	162	if (!addr->a.v4.sin_port)
5ab7b859 AV	163	addr->a.v4.sin_port = htons(bp->port);
1da177e4	164
dc022a98 SS	165	addr->use_as_src = use_as_src;
dc022a98 SS	166
1da177e4 LT	167	INIT_LIST_HEAD(&addr->list);
	168	list_add_tail(&addr->list, &bp->address_list);
	169	SCTP_DBG_OBJCNT_INC(addr);
	170
	171	return 0;
	172	}
	173
	174	/* Delete an address from the bind address list in the SCTP_bind_addr
	175	* structure.
	176	*/
	177	int sctp_del_bind_addr(struct sctp_bind_addr bp, union sctp_addr del_addr)
	178	{
	179	struct list_head pos, temp;
	180	struct sctp_sockaddr_entry *addr;
	181
	182	list_for_each_safe(pos, temp, &bp->address_list) {
	183	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
c9a08505	184	if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
1da177e4 LT	185	/* Found the exact match. */
	186	list_del(pos);
	187	kfree(addr);
	188	SCTP_DBG_OBJCNT_DEC(addr);
	189
	190	return 0;
	191	}
	192	}
	193
	194	return -EINVAL;
	195	}
	196
	197	/* Create a network byte-order representation of all the addresses
	198	* formated as SCTP parameters.
	199	*
	200	* The second argument is the return value for the length.
	201	*/
	202	union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
3182cd84	203	int *addrs_len,
dd0fc66f	204	gfp_t gfp)
1da177e4 LT	205	{
	206	union sctp_params addrparms;
	207	union sctp_params retval;
	208	int addrparms_len;
	209	union sctp_addr_param rawaddr;
	210	int len;
	211	struct sctp_sockaddr_entry *addr;
	212	struct list_head *pos;
	213	struct sctp_af *af;
	214
	215	addrparms_len = 0;
	216	len = 0;
	217
	218	/* Allocate enough memory at once. */
	219	list_for_each(pos, &bp->address_list) {
	220	len += sizeof(union sctp_addr_param);
	221	}
	222
	223	/* Don't even bother embedding an address if there
	224	* is only one.
	225	*/
	226	if (len == sizeof(union sctp_addr_param)) {
	227	retval.v = NULL;
	228	goto end_raw;
	229	}
	230
	231	retval.v = kmalloc(len, gfp);
	232	if (!retval.v)
	233	goto end_raw;
	234
	235	addrparms = retval;
	236
	237	list_for_each(pos, &bp->address_list) {
	238	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
6244be4e AV	239	af = sctp_get_af_specific(addr->a.v4.sin_family);
6244be4e AV	240	len = af->to_addr_param(&addr->a, &rawaddr);
1da177e4 LT	241	memcpy(addrparms.v, &rawaddr, len);
	242	addrparms.v += len;
	243	addrparms_len += len;
	244	}
	245
	246	end_raw:
	247	*addrs_len = addrparms_len;
	248	return retval;
	249	}
	250
	251	/*
	252	* Create an address list out of the raw address list format (IPv4 and IPv6
	253	* address parameters).
	254	*/
	255	int sctp_raw_to_bind_addrs(struct sctp_bind_addr bp, __u8 raw_addr_list,
dd0fc66f	256	int addrs_len, __u16 port, gfp_t gfp)
1da177e4 LT	257	{
	258	union sctp_addr_param *rawaddr;
	259	struct sctp_paramhdr *param;
	260	union sctp_addr addr;
	261	int retval = 0;
	262	int len;
	263	struct sctp_af *af;
	264
	265	/* Convert the raw address to standard address format */
	266	while (addrs_len) {
	267	param = (struct sctp_paramhdr *)raw_addr_list;
	268	rawaddr = (union sctp_addr_param *)raw_addr_list;
	269
	270	af = sctp_get_af_specific(param_type2af(param->type));
	271	if (unlikely(!af)) {
	272	retval = -EINVAL;
	273	sctp_bind_addr_clean(bp);
	274	break;
	275	}
	276
dd86d136 AV	277	af->from_addr_param(&addr, rawaddr, htons(port), 0);
dd86d136 AV	278	retval = sctp_add_bind_addr(bp, &addr, 1, gfp);
1da177e4 LT	279	if (retval) {
	280	/* Can't finish building the list, clean up. */
	281	sctp_bind_addr_clean(bp);
	282	break;
	283	}
	284
	285	len = ntohs(param->length);
	286	addrs_len -= len;
	287	raw_addr_list += len;
	288	}
	289
	290	return retval;
	291	}
	292
	293	/********************************************************************
	294	* 2nd Level Abstractions
	295	********************************************************************/
	296
	297	/* Does this contain a specified address? Allow wildcarding. */
d808ad9a	298	int sctp_bind_addr_match(struct sctp_bind_addr *bp,
1da177e4 LT	299	const union sctp_addr *addr,
	300	struct sctp_sock *opt)
	301	{
	302	struct sctp_sockaddr_entry *laddr;
	303	struct list_head *pos;
	304
	305	list_for_each(pos, &bp->address_list) {
	306	laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
7e1e4a2b	307	if (opt->pf->cmp_addr(&laddr->a, addr, opt))
d808ad9a	308	return 1;
1da177e4 LT	309	}
	310
	311	return 0;
	312	}
	313
	314	/* Find the first address in the bind address list that is not present in
	315	* the addrs packed array.
	316	*/
	317	union sctp_addr sctp_find_unmatch_addr(struct sctp_bind_addr bp,
	318	const union sctp_addr *addrs,
	319	int addrcnt,
	320	struct sctp_sock *opt)
	321	{
	322	struct sctp_sockaddr_entry *laddr;
	323	union sctp_addr *addr;
	324	void *addr_buf;
	325	struct sctp_af *af;
	326	struct list_head *pos;
	327	int i;
	328
	329	list_for_each(pos, &bp->address_list) {
	330	laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
d808ad9a	331
1da177e4 LT	332	addr_buf = (union sctp_addr *)addrs;
	333	for (i = 0; i < addrcnt; i++) {
	334	addr = (union sctp_addr *)addr_buf;
	335	af = sctp_get_af_specific(addr->v4.sin_family);
d808ad9a	336	if (!af)
1da177e4 LT	337	return NULL;
1da177e4 LT	338
5f242a13	339	if (opt->pf->cmp_addr(&laddr->a, addr, opt))
1da177e4 LT	340	break;
	341
	342	addr_buf += af->sockaddr_len;
	343	}
	344	if (i == addrcnt)
5ae955cf	345	return &laddr->a;
1da177e4 LT	346	}
	347
	348	return NULL;
	349	}
	350
	351	/* Copy out addresses from the global local address list. */
d808ad9a	352	static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
1da177e4	353	union sctp_addr *addr,
dd0fc66f	354	sctp_scope_t scope, gfp_t gfp,
3182cd84	355	int flags)
1da177e4 LT	356	{
	357	int error = 0;
	358
	359	if (sctp_is_any(addr)) {
	360	error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
	361	} else if (sctp_in_scope(addr, scope)) {
	362	/* Now that the address is in scope, check to see if
	363	* the address type is supported by local sock as
	364	* well as the remote peer.
	365	*/
	366	if ((((AF_INET == addr->sa.sa_family) &&
	367	(flags & SCTP_ADDR4_PEERSUPP))) \|\|
	368	(((AF_INET6 == addr->sa.sa_family) &&
	369	(flags & SCTP_ADDR6_ALLOWED) &&
	370	(flags & SCTP_ADDR6_PEERSUPP))))
02a8a4db	371	error = sctp_add_bind_addr(dest, addr, 1, gfp);
1da177e4 LT	372	}
	373
	374	return error;
	375	}
	376
	377	/* Is this a wildcard address? */
	378	int sctp_is_any(const union sctp_addr *addr)
	379	{
	380	struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
	381	if (!af)
	382	return 0;
	383	return af->is_any(addr);
	384	}
	385
	386	/* Is 'addr' valid for 'scope'? */
	387	int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
	388	{
	389	sctp_scope_t addr_scope = sctp_scope(addr);
	390
	391	/* The unusable SCTP addresses will not be considered with
	392	* any defined scopes.
	393	*/
	394	if (SCTP_SCOPE_UNUSABLE == addr_scope)
	395	return 0;
	396	/*
	397	* For INIT and INIT-ACK address list, let L be the level of
	398	* of requested destination address, sender and receiver
	399	* SHOULD include all of its addresses with level greater
	400	* than or equal to L.
	401	*/
	402	if (addr_scope <= scope)
	403	return 1;
	404
	405	return 0;
	406	}
	407
	408	/********************************************************************
	409	* 3rd Level Abstractions
	410	********************************************************************/
	411
	412	/* What is the scope of 'addr'? */
	413	sctp_scope_t sctp_scope(const union sctp_addr *addr)
	414	{
	415	struct sctp_af *af;
	416
	417	af = sctp_get_af_specific(addr->sa.sa_family);
	418	if (!af)
	419	return SCTP_SCOPE_UNUSABLE;
	420
	421	return af->scope((union sctp_addr *)addr);
	422	}