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/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2001, 2003
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* Copyright (c) Cisco 1999,2000
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* Copyright (c) Motorola 1999,2000,2001
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* Copyright (c) La Monte H.P. Yarroll 2001
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* This file is part of the SCTP kernel implementation.
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* A collection class to handle the storage of transport addresses.
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* Please send any bug reports or fixes you make to the
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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* Or submit a bug report through the following website:
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* http://www.sf.net/projects/lksctp
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* Written or modified by:
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* be incorporated into the next SCTP release.
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <net/if_inet6.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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/* Forward declarations for internal helpers. */
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static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
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sctp_scope_t scope, gfp_t gfp,
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static void sctp_bind_addr_clean(struct sctp_bind_addr *);
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/* First Level Abstractions. */
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/* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
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* in 'src' which have a broader scope than 'scope'.
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int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
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const struct sctp_bind_addr *src,
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sctp_scope_t scope, gfp_t gfp,
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struct sctp_sockaddr_entry *addr;
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/* All addresses share the same port. */
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dest->port = src->port;
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/* Extract the addresses which are relevant for this scope. */
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list_for_each_entry(addr, &src->address_list, list) {
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error = sctp_copy_one_addr(dest, &addr->a, scope,
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/* If there are no addresses matching the scope and
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* this is global scope, try to get a link scope address, with
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* the assumption that we must be sitting behind a NAT.
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if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
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list_for_each_entry(addr, &src->address_list, list) {
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error = sctp_copy_one_addr(dest, &addr->a,
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sctp_bind_addr_clean(dest);
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/* Exactly duplicate the address lists. This is necessary when doing
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* peer-offs and accepts. We don't want to put all the current system
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* addresses into the endpoint. That's useless. But we do want duplicat
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* the list of bound addresses that the older endpoint used.
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int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
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const struct sctp_bind_addr *src,
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struct sctp_sockaddr_entry *addr;
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/* All addresses share the same port. */
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dest->port = src->port;
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list_for_each_entry(addr, &src->address_list, list) {
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error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
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/* Initialize the SCTP_bind_addr structure for either an endpoint or
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void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
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INIT_LIST_HEAD(&bp->address_list);
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/* Dispose of the address list. */
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static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
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struct sctp_sockaddr_entry *addr, *temp;
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/* Empty the bind address list. */
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list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
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list_del_rcu(&addr->list);
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kfree_rcu(addr, rcu);
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SCTP_DBG_OBJCNT_DEC(addr);
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/* Dispose of an SCTP_bind_addr structure */
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void sctp_bind_addr_free(struct sctp_bind_addr *bp)
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/* Empty the bind address list. */
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sctp_bind_addr_clean(bp);
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SCTP_DBG_OBJCNT_DEC(bind_addr);
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/* Add an address to the bind address list in the SCTP_bind_addr structure. */
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int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
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__u8 addr_state, gfp_t gfp)
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struct sctp_sockaddr_entry *addr;
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/* Add the address to the bind address list. */
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addr = t_new(struct sctp_sockaddr_entry, gfp);
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memcpy(&addr->a, new, sizeof(*new));
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/* Fix up the port if it has not yet been set.
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* Both v4 and v6 have the port at the same offset.
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if (!addr->a.v4.sin_port)
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addr->a.v4.sin_port = htons(bp->port);
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addr->state = addr_state;
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INIT_LIST_HEAD(&addr->list);
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/* We always hold a socket lock when calling this function,
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* and that acts as a writer synchronizing lock.
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list_add_tail_rcu(&addr->list, &bp->address_list);
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SCTP_DBG_OBJCNT_INC(addr);
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/* Delete an address from the bind address list in the SCTP_bind_addr
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int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
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struct sctp_sockaddr_entry *addr, *temp;
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/* We hold the socket lock when calling this function,
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* and that acts as a writer synchronizing lock.
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list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
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if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
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/* Found the exact match. */
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list_del_rcu(&addr->list);
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kfree_rcu(addr, rcu);
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SCTP_DBG_OBJCNT_DEC(addr);
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/* Create a network byte-order representation of all the addresses
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* formated as SCTP parameters.
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* The second argument is the return value for the length.
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union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
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union sctp_params addrparms;
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union sctp_params retval;
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union sctp_addr_param rawaddr;
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struct sctp_sockaddr_entry *addr;
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struct list_head *pos;
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/* Allocate enough memory at once. */
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list_for_each(pos, &bp->address_list) {
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len += sizeof(union sctp_addr_param);
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/* Don't even bother embedding an address if there
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if (len == sizeof(union sctp_addr_param)) {
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retval.v = kmalloc(len, gfp);
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list_for_each_entry(addr, &bp->address_list, list) {
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af = sctp_get_af_specific(addr->a.v4.sin_family);
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len = af->to_addr_param(&addr->a, &rawaddr);
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memcpy(addrparms.v, &rawaddr, len);
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addrparms_len += len;
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*addrs_len = addrparms_len;
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* Create an address list out of the raw address list format (IPv4 and IPv6
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* address parameters).
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int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
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int addrs_len, __u16 port, gfp_t gfp)
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union sctp_addr_param *rawaddr;
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struct sctp_paramhdr *param;
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union sctp_addr addr;
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/* Convert the raw address to standard address format */
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param = (struct sctp_paramhdr *)raw_addr_list;
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rawaddr = (union sctp_addr_param *)raw_addr_list;
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af = sctp_get_af_specific(param_type2af(param->type));
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sctp_bind_addr_clean(bp);
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af->from_addr_param(&addr, rawaddr, htons(port), 0);
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retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp);
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/* Can't finish building the list, clean up. */
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sctp_bind_addr_clean(bp);
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len = ntohs(param->length);
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raw_addr_list += len;
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/********************************************************************
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* 2nd Level Abstractions
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********************************************************************/
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/* Does this contain a specified address? Allow wildcarding. */
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int sctp_bind_addr_match(struct sctp_bind_addr *bp,
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const union sctp_addr *addr,
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struct sctp_sock *opt)
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struct sctp_sockaddr_entry *laddr;
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list_for_each_entry_rcu(laddr, &bp->address_list, list) {
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if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
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/* Does the address 'addr' conflict with any addresses in
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int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
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const union sctp_addr *addr,
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struct sctp_sock *bp_sp,
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struct sctp_sock *addr_sp)
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struct sctp_sockaddr_entry *laddr;
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struct sctp_sock *sp;
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/* Pick the IPv6 socket as the basis of comparison
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* since it's usually a superset of the IPv4.
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* If there is no IPv6 socket, then default to bind_addr.
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if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
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else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
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list_for_each_entry_rcu(laddr, &bp->address_list, list) {
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conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
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/* Get the state of the entry in the bind_addr_list */
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int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
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const union sctp_addr *addr)
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struct sctp_sockaddr_entry *laddr;
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af = sctp_get_af_specific(addr->sa.sa_family);
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list_for_each_entry_rcu(laddr, &bp->address_list, list) {
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if (af->cmp_addr(&laddr->a, addr)) {
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state = laddr->state;
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/* Find the first address in the bind address list that is not present in
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* the addrs packed array.
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union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
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const union sctp_addr *addrs,
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struct sctp_sock *opt)
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struct sctp_sockaddr_entry *laddr;
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union sctp_addr *addr;
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/* This is only called sctp_send_asconf_del_ip() and we hold
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* the socket lock in that code patch, so that address list
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list_for_each_entry(laddr, &bp->address_list, list) {
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addr_buf = (union sctp_addr *)addrs;
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for (i = 0; i < addrcnt; i++) {
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af = sctp_get_af_specific(addr->v4.sin_family);
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if (opt->pf->cmp_addr(&laddr->a, addr, opt))
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addr_buf += af->sockaddr_len;
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/* Copy out addresses from the global local address list. */
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static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
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union sctp_addr *addr,
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sctp_scope_t scope, gfp_t gfp,
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if (sctp_is_any(NULL, addr)) {
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error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
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} else if (sctp_in_scope(addr, scope)) {
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/* Now that the address is in scope, check to see if
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* the address type is supported by local sock as
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* well as the remote peer.
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if ((((AF_INET == addr->sa.sa_family) &&
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(flags & SCTP_ADDR4_PEERSUPP))) ||
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(((AF_INET6 == addr->sa.sa_family) &&
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(flags & SCTP_ADDR6_ALLOWED) &&
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(flags & SCTP_ADDR6_PEERSUPP))))
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error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC,
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/* Is this a wildcard address? */
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int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
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unsigned short fam = 0;
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/* Try to get the right address family */
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if (addr->sa.sa_family != AF_UNSPEC)
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fam = addr->sa.sa_family;
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af = sctp_get_af_specific(fam);
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return af->is_any(addr);
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/* Is 'addr' valid for 'scope'? */
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int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
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sctp_scope_t addr_scope = sctp_scope(addr);
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/* The unusable SCTP addresses will not be considered with
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* any defined scopes.
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if (SCTP_SCOPE_UNUSABLE == addr_scope)
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* For INIT and INIT-ACK address list, let L be the level of
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* of requested destination address, sender and receiver
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* SHOULD include all of its addresses with level greater
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* than or equal to L.
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* Address scoping can be selectively controlled via sysctl
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switch (sctp_scope_policy) {
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case SCTP_SCOPE_POLICY_DISABLE:
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case SCTP_SCOPE_POLICY_ENABLE:
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if (addr_scope <= scope)
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case SCTP_SCOPE_POLICY_PRIVATE:
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if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
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case SCTP_SCOPE_POLICY_LINK:
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if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
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int sctp_is_ep_boundall(struct sock *sk)
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struct sctp_bind_addr *bp;
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struct sctp_sockaddr_entry *addr;
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bp = &sctp_sk(sk)->ep->base.bind_addr;
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if (sctp_list_single_entry(&bp->address_list)) {
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addr = list_entry(bp->address_list.next,
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struct sctp_sockaddr_entry, list);
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if (sctp_is_any(sk, &addr->a))
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/********************************************************************
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* 3rd Level Abstractions
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********************************************************************/
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/* What is the scope of 'addr'? */
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sctp_scope_t sctp_scope(const union sctp_addr *addr)
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af = sctp_get_af_specific(addr->sa.sa_family);
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return SCTP_SCOPE_UNUSABLE;
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return af->scope((union sctp_addr *)addr);