[mirror_ubuntu-jammy-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_h, 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_h,
						   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_h, 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_h.v4.sin_port)
		addr->a_h.v4.sin_port = bp->port;

	flip_to_n(&addr->a, &addr->a_h);

	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;
	union sctp_addr tmp;

	flip_to_n(&tmp, del_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, &tmp)) {
			/* 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_h.v4.sin_family);
		len = af->to_addr_param(&addr->a_h, &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, 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_h;
	}

	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);
09ef7fec	80	error = sctp_copy_one_addr(dest, &addr->a_h, 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);
09ef7fec	94	error = sctp_copy_one_addr(dest, &addr->a_h,
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
09ef7fec	158	memcpy(&addr->a_h, 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	*/
09ef7fec AV	163	if (!addr->a_h.v4.sin_port)
09ef7fec AV	164	addr->a_h.v4.sin_port = bp->port;
1da177e4	165
2a6fd78a AV	166	flip_to_n(&addr->a, &addr->a_h);
2a6fd78a AV	167
dc022a98 SS	168	addr->use_as_src = use_as_src;
dc022a98 SS	169
1da177e4 LT	170	INIT_LIST_HEAD(&addr->list);
	171	list_add_tail(&addr->list, &bp->address_list);
	172	SCTP_DBG_OBJCNT_INC(addr);
	173
	174	return 0;
	175	}
	176
	177	/* Delete an address from the bind address list in the SCTP_bind_addr
	178	* structure.
	179	*/
	180	int sctp_del_bind_addr(struct sctp_bind_addr bp, union sctp_addr del_addr)
	181	{
	182	struct list_head pos, temp;
	183	struct sctp_sockaddr_entry *addr;
5f242a13 AV	184	union sctp_addr tmp;
	185
	186	flip_to_n(&tmp, del_addr);
1da177e4 LT	187
	188	list_for_each_safe(pos, temp, &bp->address_list) {
	189	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
5f242a13	190	if (sctp_cmp_addr_exact(&addr->a, &tmp)) {
1da177e4 LT	191	/* Found the exact match. */
	192	list_del(pos);
	193	kfree(addr);
	194	SCTP_DBG_OBJCNT_DEC(addr);
	195
	196	return 0;
	197	}
	198	}
	199
	200	return -EINVAL;
	201	}
	202
	203	/* Create a network byte-order representation of all the addresses
	204	* formated as SCTP parameters.
	205	*
	206	* The second argument is the return value for the length.
	207	*/
	208	union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
3182cd84	209	int *addrs_len,
dd0fc66f	210	gfp_t gfp)
1da177e4 LT	211	{
	212	union sctp_params addrparms;
	213	union sctp_params retval;
	214	int addrparms_len;
	215	union sctp_addr_param rawaddr;
	216	int len;
	217	struct sctp_sockaddr_entry *addr;
	218	struct list_head *pos;
	219	struct sctp_af *af;
	220
	221	addrparms_len = 0;
	222	len = 0;
	223
	224	/* Allocate enough memory at once. */
	225	list_for_each(pos, &bp->address_list) {
	226	len += sizeof(union sctp_addr_param);
	227	}
	228
	229	/* Don't even bother embedding an address if there
	230	* is only one.
	231	*/
	232	if (len == sizeof(union sctp_addr_param)) {
	233	retval.v = NULL;
	234	goto end_raw;
	235	}
	236
	237	retval.v = kmalloc(len, gfp);
	238	if (!retval.v)
	239	goto end_raw;
	240
	241	addrparms = retval;
	242
	243	list_for_each(pos, &bp->address_list) {
	244	addr = list_entry(pos, struct sctp_sockaddr_entry, list);
09ef7fec AV	245	af = sctp_get_af_specific(addr->a_h.v4.sin_family);
09ef7fec AV	246	len = af->to_addr_param(&addr->a_h, &rawaddr);
1da177e4 LT	247	memcpy(addrparms.v, &rawaddr, len);
	248	addrparms.v += len;
	249	addrparms_len += len;
	250	}
	251
	252	end_raw:
	253	*addrs_len = addrparms_len;
	254	return retval;
	255	}
	256
	257	/*
	258	* Create an address list out of the raw address list format (IPv4 and IPv6
	259	* address parameters).
	260	*/
	261	int sctp_raw_to_bind_addrs(struct sctp_bind_addr bp, __u8 raw_addr_list,
dd0fc66f	262	int addrs_len, __u16 port, gfp_t gfp)
1da177e4 LT	263	{
	264	union sctp_addr_param *rawaddr;
	265	struct sctp_paramhdr *param;
	266	union sctp_addr addr;
	267	int retval = 0;
	268	int len;
	269	struct sctp_af *af;
	270
	271	/* Convert the raw address to standard address format */
	272	while (addrs_len) {
	273	param = (struct sctp_paramhdr *)raw_addr_list;
	274	rawaddr = (union sctp_addr_param *)raw_addr_list;
	275
	276	af = sctp_get_af_specific(param_type2af(param->type));
	277	if (unlikely(!af)) {
	278	retval = -EINVAL;
	279	sctp_bind_addr_clean(bp);
	280	break;
	281	}
	282
	283	af->from_addr_param(&addr, rawaddr, port, 0);
dc022a98	284	retval = sctp_add_bind_addr(bp, &addr, 1, gfp);
1da177e4 LT	285	if (retval) {
	286	/* Can't finish building the list, clean up. */
	287	sctp_bind_addr_clean(bp);
	288	break;
	289	}
	290
	291	len = ntohs(param->length);
	292	addrs_len -= len;
	293	raw_addr_list += len;
	294	}
	295
	296	return retval;
	297	}
	298
	299	/********************************************************************
	300	* 2nd Level Abstractions
	301	********************************************************************/
	302
	303	/* Does this contain a specified address? Allow wildcarding. */
	304	int sctp_bind_addr_match(struct sctp_bind_addr *bp,
	305	const union sctp_addr *addr,
	306	struct sctp_sock *opt)
	307	{
	308	struct sctp_sockaddr_entry *laddr;
	309	struct list_head *pos;
	310
	311	list_for_each(pos, &bp->address_list) {
	312	laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
7e1e4a2b	313	if (opt->pf->cmp_addr(&laddr->a, addr, opt))
1da177e4 LT	314	return 1;
	315	}
	316
	317	return 0;
	318	}
	319
	320	/* Find the first address in the bind address list that is not present in
	321	* the addrs packed array.
	322	*/
	323	union sctp_addr sctp_find_unmatch_addr(struct sctp_bind_addr bp,
	324	const union sctp_addr *addrs,
	325	int addrcnt,
	326	struct sctp_sock *opt)
	327	{
	328	struct sctp_sockaddr_entry *laddr;
	329	union sctp_addr *addr;
	330	void *addr_buf;
	331	struct sctp_af *af;
	332	struct list_head *pos;
	333	int i;
	334
	335	list_for_each(pos, &bp->address_list) {
	336	laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
	337
	338	addr_buf = (union sctp_addr *)addrs;
	339	for (i = 0; i < addrcnt; i++) {
	340	addr = (union sctp_addr *)addr_buf;
	341	af = sctp_get_af_specific(addr->v4.sin_family);
	342	if (!af)
	343	return NULL;
	344
5f242a13	345	if (opt->pf->cmp_addr(&laddr->a, addr, opt))
1da177e4 LT	346	break;
	347
	348	addr_buf += af->sockaddr_len;
	349	}
	350	if (i == addrcnt)
09ef7fec	351	return &laddr->a_h;
1da177e4 LT	352	}
	353
	354	return NULL;
	355	}
	356
	357	/* Copy out addresses from the global local address list. */
	358	static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
	359	union sctp_addr *addr,
dd0fc66f	360	sctp_scope_t scope, gfp_t gfp,
3182cd84	361	int flags)
1da177e4 LT	362	{
	363	int error = 0;
	364
	365	if (sctp_is_any(addr)) {
	366	error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
	367	} else if (sctp_in_scope(addr, scope)) {
	368	/* Now that the address is in scope, check to see if
	369	* the address type is supported by local sock as
	370	* well as the remote peer.
	371	*/
	372	if ((((AF_INET == addr->sa.sa_family) &&
	373	(flags & SCTP_ADDR4_PEERSUPP))) \|\|
	374	(((AF_INET6 == addr->sa.sa_family) &&
	375	(flags & SCTP_ADDR6_ALLOWED) &&
	376	(flags & SCTP_ADDR6_PEERSUPP))))
dc022a98	377	error = sctp_add_bind_addr(dest, addr, 1, gfp);
1da177e4 LT	378	}
	379
	380	return error;
	381	}
	382
	383	/* Is this a wildcard address? */
	384	int sctp_is_any(const union sctp_addr *addr)
	385	{
	386	struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
	387	if (!af)
	388	return 0;
	389	return af->is_any(addr);
	390	}
	391
	392	/* Is 'addr' valid for 'scope'? */
	393	int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
	394	{
	395	sctp_scope_t addr_scope = sctp_scope(addr);
	396
	397	/* The unusable SCTP addresses will not be considered with
	398	* any defined scopes.
	399	*/
	400	if (SCTP_SCOPE_UNUSABLE == addr_scope)
	401	return 0;
	402	/*
	403	* For INIT and INIT-ACK address list, let L be the level of
	404	* of requested destination address, sender and receiver
	405	* SHOULD include all of its addresses with level greater
	406	* than or equal to L.
	407	*/
	408	if (addr_scope <= scope)
	409	return 1;
	410
	411	return 0;
	412	}
	413
	414	/********************************************************************
	415	* 3rd Level Abstractions
	416	********************************************************************/
	417
	418	/* What is the scope of 'addr'? */
	419	sctp_scope_t sctp_scope(const union sctp_addr *addr)
	420	{
	421	struct sctp_af *af;
	422
	423	af = sctp_get_af_specific(addr->sa.sa_family);
	424	if (!af)
	425	return SCTP_SCOPE_UNUSABLE;
	426
	427	return af->scope((union sctp_addr *)addr);
	428	}