patch-2.4.23 linux-2.4.23/net/sctp/bind_addr.c

• Lines: 397
• Date: 2003-11-28 10:26:21.000000000 -0800
• Orig file: linux-2.4.22/net/sctp/bind_addr.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.22/net/sctp/bind_addr.c linux-2.4.23/net/sctp/bind_addr.c
@@ -0,0 +1,396 @@
+/* SCTP kernel reference Implementation
+ * Copyright (c) Cisco 1999,2000
+ * Copyright (c) Motorola 1999,2000,2001
+ * Copyright (c) International Business Machines Corp., 2001,2002
+ * 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(sctp_bind_addr_t *, union sctp_addr *,
+			      sctp_scope_t scope, int gfp, int flags);
+static void sctp_bind_addr_clean(sctp_bind_addr_t *);
+
+/* 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(sctp_bind_addr_t *dest, const sctp_bind_addr_t *src,
+			sctp_scope_t scope, int gfp, int flags)
+{
+	struct sockaddr_storage_list *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 sockaddr_storage_list, 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 sockaddr_storage_list,
+					  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;
+}
+
+/* Create a new SCTP_bind_addr from nothing.  */
+sctp_bind_addr_t *sctp_bind_addr_new(int gfp)
+{
+	sctp_bind_addr_t *retval;
+
+	retval = t_new(sctp_bind_addr_t, gfp);
+	if (!retval)
+		goto nomem;
+
+	sctp_bind_addr_init(retval, 0);
+	retval->malloced = 1;
+	SCTP_DBG_OBJCNT_INC(bind_addr);
+
+nomem:
+	return retval;
+}
+
+/* Initialize the SCTP_bind_addr structure for either an endpoint or
+ * an association.
+ */
+void sctp_bind_addr_init(sctp_bind_addr_t *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(sctp_bind_addr_t *bp)
+{
+	struct sockaddr_storage_list *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 sockaddr_storage_list, list);
+		list_del(pos);
+		kfree(addr);
+		SCTP_DBG_OBJCNT_DEC(addr);
+	}
+}
+
+/* Dispose of an SCTP_bind_addr structure  */
+void sctp_bind_addr_free(sctp_bind_addr_t *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(sctp_bind_addr_t *bp, union sctp_addr *new,
+		       int gfp)
+{
+	struct sockaddr_storage_list *addr;
+
+	/* Add the address to the bind address list.  */
+	addr = t_new(struct sockaddr_storage_list, gfp);
+	if (!addr)
+		return -ENOMEM;
+
+	addr->a = *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 = bp->port;
+
+	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(sctp_bind_addr_t *bp, union sctp_addr *del_addr)
+{
+	struct list_head *pos, *temp;
+	struct sockaddr_storage_list *addr;
+
+	list_for_each_safe(pos, temp, &bp->address_list) {
+		addr = list_entry(pos, struct sockaddr_storage_list, 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 sctp_bind_addr_t *bp,
+					 int *addrs_len, int gfp)
+{
+	union sctp_params addrparms;
+	union sctp_params retval;
+	int addrparms_len;
+	sctp_addr_param_t rawaddr;
+	int len;
+	struct sockaddr_storage_list *addr;
+	struct list_head *pos;
+	addrparms_len = 0;
+	len = 0;
+
+	/* Allocate enough memory at once. */
+	list_for_each(pos, &bp->address_list) {
+		len += sizeof(sctp_addr_param_t);
+	}
+
+	/* Don't even bother embedding an address if there
+	 * is only one.
+	 */
+	if (len == sizeof(sctp_addr_param_t)) {
+		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 sockaddr_storage_list, list);
+		len = sockaddr2sctp_addr(&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(sctp_bind_addr_t *bp, __u8 *raw_addr_list,
+			   int addrs_len, __u16 port, int gfp)
+{
+	sctp_addr_param_t *rawaddr;
+	sctp_paramhdr_t *param;
+	union sctp_addr addr;
+	int retval = 0;
+	int len;
+
+	/* Convert the raw address to standard address format */
+	while (addrs_len) {
+		param = (sctp_paramhdr_t *)raw_addr_list;
+		rawaddr = (sctp_addr_param_t *)raw_addr_list;
+
+		switch (param->type) {
+		case SCTP_PARAM_IPV4_ADDRESS:
+		case SCTP_PARAM_IPV6_ADDRESS:
+			sctp_param2sockaddr(&addr, rawaddr, port, 0);
+			retval = sctp_add_bind_addr(bp, &addr, 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;
+			break;
+		default:
+			/* Corrupted raw addr list! */
+			retval = -EINVAL;
+			sctp_bind_addr_clean(bp);
+			break;
+		}
+		if (retval)
+			break;
+	}
+
+	return retval;
+}
+
+/********************************************************************
+ * 2nd Level Abstractions
+ ********************************************************************/
+
+/* Does this contain a specified address?  Allow wildcarding. */
+int sctp_bind_addr_match(sctp_bind_addr_t *bp, const union sctp_addr *addr,
+			 struct sctp_opt *opt)
+{
+	struct sockaddr_storage_list *laddr;
+	struct list_head *pos;
+
+	list_for_each(pos, &bp->address_list) {
+		laddr = list_entry(pos, struct sockaddr_storage_list, list);
+		if (opt->pf->cmp_addr(&laddr->a, addr, opt))
+ 			return 1;
+	}
+
+	return 0;
+}
+
+/* Copy out addresses from the global local address list. */
+static int sctp_copy_one_addr(sctp_bind_addr_t *dest, union sctp_addr *addr,
+			      sctp_scope_t scope, int gfp, int flags)
+{
+	struct sctp_protocol *proto = sctp_get_protocol();
+	int error = 0;
+
+	if (sctp_is_any(addr)) {
+		error = sctp_copy_local_addr_list(proto, 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, 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);
+}