[mirror_ubuntu-bionic-kernel.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/sched.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>
	46	#include <linux/sched.h>
	47	#include <linux/in.h>
	48	#include <net/sock.h>
	49	#include <net/ipv6.h>
	50	#include <net/if_inet6.h>
	51	#include <net/sctp/sctp.h>
	52	#include <net/sctp/sm.h>
	53
	54	/* Forward declarations for internal helpers. */
	55	static int sctp_copy_one_addr(struct sctp_bind_addr , union sctp_addr ,
dd0fc66f	56	sctp_scope_t scope, gfp_t gfp,
3182cd84	57	int flags);
1da177e4 LT	58	static void sctp_bind_addr_clean(struct sctp_bind_addr *);
	59
	60	/* First Level Abstractions. */
	61
	62	/* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
	63	* in 'src' which have a broader scope than 'scope'.
	64	*/
	65	int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
	66	const struct sctp_bind_addr *src,
dd0fc66f	67	sctp_scope_t scope, gfp_t gfp,
3182cd84	68	int flags)
1da177e4 LT	69	{
	70	struct sctp_sockaddr_entry *addr;
	71	struct list_head *pos;
	72	int error = 0;
	73
	74	/* All addresses share the same port. */
	75	dest->port = src->port;
	76
	77	/* Extract the addresses which are relevant for this scope. */
	78	list_for_each(pos, &src->address_list) {
	79	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
02a8a4db	80	error = sctp_copy_one_addr(dest, &addr->a, scope,
1da177e4 LT	81	gfp, flags);
	82	if (error < 0)
	83	goto out;
	84	}
	85
	86	/* If there are no addresses matching the scope and
	87	* this is global scope, try to get a link scope address, with
	88	* the assumption that we must be sitting behind a NAT.
	89	*/
	90	if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
	91	list_for_each(pos, &src->address_list) {
	92	addr = list_entry(pos, struct sctp_sockaddr_entry,
	93	list);
02a8a4db	94	error = sctp_copy_one_addr(dest, &addr->a,
1da177e4 LT	95	SCTP_SCOPE_LINK, gfp,
	96	flags);
	97	if (error < 0)
	98	goto out;
	99	}
	100	}
	101
	102	out:
	103	if (error)
	104	sctp_bind_addr_clean(dest);
	105
	106	return error;
	107	}
	108
	109	/* Initialize the SCTP_bind_addr structure for either an endpoint or
	110	* an association.
	111	*/
	112	void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
	113	{
	114	bp->malloced = 0;
	115
	116	INIT_LIST_HEAD(&bp->address_list);
	117	bp->port = port;
	118	}
	119
	120	/* Dispose of the address list. */
	121	static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
	122	{
	123	struct sctp_sockaddr_entry *addr;
	124	struct list_head pos, temp;
	125
	126	/* Empty the bind address list. */
	127	list_for_each_safe(pos, temp, &bp->address_list) {
	128	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
	129	list_del(pos);
	130	kfree(addr);
	131	SCTP_DBG_OBJCNT_DEC(addr);
	132	}
	133	}
	134
	135	/* Dispose of an SCTP_bind_addr structure */
	136	void sctp_bind_addr_free(struct sctp_bind_addr *bp)
	137	{
	138	/* Empty the bind address list. */
	139	sctp_bind_addr_clean(bp);
	140
	141	if (bp->malloced) {
	142	kfree(bp);
	143	SCTP_DBG_OBJCNT_DEC(bind_addr);
	144	}
	145	}
	146
	147	/* Add an address to the bind address list in the SCTP_bind_addr structure. */
	148	int sctp_add_bind_addr(struct sctp_bind_addr bp, union sctp_addr new,
dc022a98	149	__u8 use_as_src, gfp_t gfp)
1da177e4 LT	150	{
	151	struct sctp_sockaddr_entry *addr;
	152
	153	/* Add the address to the bind address list. */
	154	addr = t_new(struct sctp_sockaddr_entry, gfp);
	155	if (!addr)
	156	return -ENOMEM;
	157
5ab7b859	158	memcpy(&addr->a, new, sizeof(*new));
1da177e4 LT	159
	160	/* Fix up the port if it has not yet been set.
	161	* Both v4 and v6 have the port at the same offset.
	162	*/
5ab7b859 AV	163	if (!addr->a.v4.sin_port)
5ab7b859 AV	164	addr->a.v4.sin_port = htons(bp->port);
1da177e4	165
dc022a98 SS	166	addr->use_as_src = use_as_src;
dc022a98 SS	167
1da177e4 LT	168	INIT_LIST_HEAD(&addr->list);
	169	list_add_tail(&addr->list, &bp->address_list);
	170	SCTP_DBG_OBJCNT_INC(addr);
	171
	172	return 0;
	173	}
	174
	175	/* Delete an address from the bind address list in the SCTP_bind_addr
	176	* structure.
	177	*/
	178	int sctp_del_bind_addr(struct sctp_bind_addr bp, union sctp_addr del_addr)
	179	{
	180	struct list_head pos, temp;
	181	struct sctp_sockaddr_entry *addr;
	182
	183	list_for_each_safe(pos, temp, &bp->address_list) {
	184	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
c9a08505	185	if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
1da177e4 LT	186	/* Found the exact match. */
	187	list_del(pos);
	188	kfree(addr);
	189	SCTP_DBG_OBJCNT_DEC(addr);
	190
	191	return 0;
	192	}
	193	}
	194
	195	return -EINVAL;
	196	}
	197
	198	/* Create a network byte-order representation of all the addresses
	199	* formated as SCTP parameters.
	200	*
	201	* The second argument is the return value for the length.
	202	*/
	203	union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
3182cd84	204	int *addrs_len,
dd0fc66f	205	gfp_t gfp)
1da177e4 LT	206	{
	207	union sctp_params addrparms;
	208	union sctp_params retval;
	209	int addrparms_len;
	210	union sctp_addr_param rawaddr;
	211	int len;
	212	struct sctp_sockaddr_entry *addr;
	213	struct list_head *pos;
	214	struct sctp_af *af;
	215
	216	addrparms_len = 0;
	217	len = 0;
	218
	219	/* Allocate enough memory at once. */
	220	list_for_each(pos, &bp->address_list) {
	221	len += sizeof(union sctp_addr_param);
	222	}
	223
	224	/* Don't even bother embedding an address if there
	225	* is only one.
	226	*/
	227	if (len == sizeof(union sctp_addr_param)) {
	228	retval.v = NULL;
	229	goto end_raw;
	230	}
	231
	232	retval.v = kmalloc(len, gfp);
	233	if (!retval.v)
	234	goto end_raw;
	235
	236	addrparms = retval;
	237
	238	list_for_each(pos, &bp->address_list) {
	239	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
6244be4e AV	240	af = sctp_get_af_specific(addr->a.v4.sin_family);
6244be4e AV	241	len = af->to_addr_param(&addr->a, &rawaddr);
1da177e4 LT	242	memcpy(addrparms.v, &rawaddr, len);
	243	addrparms.v += len;
	244	addrparms_len += len;
	245	}
	246
	247	end_raw:
	248	*addrs_len = addrparms_len;
	249	return retval;
	250	}
	251
	252	/*
	253	* Create an address list out of the raw address list format (IPv4 and IPv6
	254	* address parameters).
	255	*/
	256	int sctp_raw_to_bind_addrs(struct sctp_bind_addr bp, __u8 raw_addr_list,
dd0fc66f	257	int addrs_len, __u16 port, gfp_t gfp)
1da177e4 LT	258	{
	259	union sctp_addr_param *rawaddr;
	260	struct sctp_paramhdr *param;
	261	union sctp_addr addr;
	262	int retval = 0;
	263	int len;
	264	struct sctp_af *af;
	265
	266	/* Convert the raw address to standard address format */
	267	while (addrs_len) {
	268	param = (struct sctp_paramhdr *)raw_addr_list;
	269	rawaddr = (union sctp_addr_param *)raw_addr_list;
	270
	271	af = sctp_get_af_specific(param_type2af(param->type));
	272	if (unlikely(!af)) {
	273	retval = -EINVAL;
	274	sctp_bind_addr_clean(bp);
	275	break;
	276	}
	277
dd86d136 AV	278	af->from_addr_param(&addr, rawaddr, htons(port), 0);
dd86d136 AV	279	retval = sctp_add_bind_addr(bp, &addr, 1, gfp);
1da177e4 LT	280	if (retval) {
	281	/* Can't finish building the list, clean up. */
	282	sctp_bind_addr_clean(bp);
	283	break;
	284	}
	285
	286	len = ntohs(param->length);
	287	addrs_len -= len;
	288	raw_addr_list += len;
	289	}
	290
	291	return retval;
	292	}
	293
	294	/********************************************************************
	295	* 2nd Level Abstractions
	296	********************************************************************/
	297
	298	/* Does this contain a specified address? Allow wildcarding. */
	299	int sctp_bind_addr_match(struct sctp_bind_addr *bp,
	300	const union sctp_addr *addr,
	301	struct sctp_sock *opt)
	302	{
	303	struct sctp_sockaddr_entry *laddr;
	304	struct list_head *pos;
	305
	306	list_for_each(pos, &bp->address_list) {
	307	laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
7e1e4a2b	308	if (opt->pf->cmp_addr(&laddr->a, addr, opt))
1da177e4 LT	309	return 1;
	310	}
	311
	312	return 0;
	313	}
	314
	315	/* Find the first address in the bind address list that is not present in
	316	* the addrs packed array.
	317	*/
	318	union sctp_addr sctp_find_unmatch_addr(struct sctp_bind_addr bp,
	319	const union sctp_addr *addrs,
	320	int addrcnt,
	321	struct sctp_sock *opt)
	322	{
	323	struct sctp_sockaddr_entry *laddr;
	324	union sctp_addr *addr;
	325	void *addr_buf;
	326	struct sctp_af *af;
	327	struct list_head *pos;
	328	int i;
	329
	330	list_for_each(pos, &bp->address_list) {
	331	laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
	332
	333	addr_buf = (union sctp_addr *)addrs;
	334	for (i = 0; i < addrcnt; i++) {
	335	addr = (union sctp_addr *)addr_buf;
	336	af = sctp_get_af_specific(addr->v4.sin_family);
	337	if (!af)
	338	return NULL;
	339
5f242a13	340	if (opt->pf->cmp_addr(&laddr->a, addr, opt))
1da177e4 LT	341	break;
	342
	343	addr_buf += af->sockaddr_len;
	344	}
	345	if (i == addrcnt)
5ae955cf	346	return &laddr->a;
1da177e4 LT	347	}
	348
	349	return NULL;
	350	}
	351
	352	/* Copy out addresses from the global local address list. */
	353	static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
	354	union sctp_addr *addr,
dd0fc66f	355	sctp_scope_t scope, gfp_t gfp,
3182cd84	356	int flags)
1da177e4 LT	357	{
	358	int error = 0;
	359
	360	if (sctp_is_any(addr)) {
	361	error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
	362	} else if (sctp_in_scope(addr, scope)) {
	363	/* Now that the address is in scope, check to see if
	364	* the address type is supported by local sock as
	365	* well as the remote peer.
	366	*/
	367	if ((((AF_INET == addr->sa.sa_family) &&
	368	(flags & SCTP_ADDR4_PEERSUPP))) \|\|
	369	(((AF_INET6 == addr->sa.sa_family) &&
	370	(flags & SCTP_ADDR6_ALLOWED) &&
	371	(flags & SCTP_ADDR6_PEERSUPP))))
02a8a4db	372	error = sctp_add_bind_addr(dest, addr, 1, gfp);
1da177e4 LT	373	}
	374
	375	return error;
	376	}
	377
	378	/* Is this a wildcard address? */
	379	int sctp_is_any(const union sctp_addr *addr)
	380	{
	381	struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
	382	if (!af)
	383	return 0;
	384	return af->is_any(addr);
	385	}
	386
	387	/* Is 'addr' valid for 'scope'? */
	388	int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
	389	{
	390	sctp_scope_t addr_scope = sctp_scope(addr);
	391
	392	/* The unusable SCTP addresses will not be considered with
	393	* any defined scopes.
	394	*/
	395	if (SCTP_SCOPE_UNUSABLE == addr_scope)
	396	return 0;
	397	/*
	398	* For INIT and INIT-ACK address list, let L be the level of
	399	* of requested destination address, sender and receiver
	400	* SHOULD include all of its addresses with level greater
	401	* than or equal to L.
	402	*/
	403	if (addr_scope <= scope)
	404	return 1;
	405
	406	return 0;
	407	}
	408
	409	/********************************************************************
	410	* 3rd Level Abstractions
	411	********************************************************************/
	412
	413	/* What is the scope of 'addr'? */
	414	sctp_scope_t sctp_scope(const union sctp_addr *addr)
	415	{
	416	struct sctp_af *af;
	417
	418	af = sctp_get_af_specific(addr->sa.sa_family);
	419	if (!af)
	420	return SCTP_SCOPE_UNUSABLE;
	421
	422	return af->scope((union sctp_addr *)addr);
	423	}